Shanxian Chemical
PRODUCTS
Halogen-Free Flame Retardant Masterbatch
Shanxian Chemical
|
HS Code |
910645 |
| Flammability | Highly flame - retardant |
| Halogen Content | Zero |
| Thermal Stability | Good, withstands high processing temperatures |
| Mechanical Properties Tensile | Maintains good tensile strength |
| Dispersion Ability | Excellent dispersion in polymers |
| Chemical Resistance | Resistant to common chemicals |
| Weather Resistance | Good weather - resistance |
| Smoke Generation | Low smoke generation during combustion |
| Toxic Gas Emission | Low toxic gas emission during combustion |
| Compatibility | Good compatibility with various polymers |
As an accredited Halogen-Free Flame Retardant Masterbatch factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Halogen - Free Flame Retardant Masterbatch, 25 - kg bags for safe and easy handling. |
| Storage | Halogen - Free Flame Retardant Masterbatch should be stored in a cool, dry place away from direct sunlight and heat sources. Keep it in a well - ventilated area to prevent moisture absorption. Store in original packaging to maintain its quality. Avoid contact with incompatible substances. Proper storage helps preserve its flame - retardant properties and ensures safety during storage. |
| Shipping | Halogen - Free Flame Retardant Masterbatch is shipped in sealed, sturdy containers to prevent moisture and contamination. Shipment may be via road, sea, or air, adhering to strict chemical transportation regulations. |
Competitive Halogen-Free Flame Retardant Masterbatch prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please call us at +8615365186327 or mail to info@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615365186327
Email: info@liwei-chem.com
Historical Development
Yu Taste is dedicated to the research of halogen-based flame retardants. At that time, halogen-based flame retardants were widely used and had considerable effectiveness. However, with the passage of time, with the gradual rise of environmental awareness, its drawbacks gradually became apparent, such as the release of toxic smoke during combustion, which endangered life, and was not easy to degrade, resulting in heavy environmental load.
Then we thought of innovation and developed halogen-free flame retardant masterbatches. At the beginning, the road of exploration was full of thorns, and the performance indicators were difficult to meet expectations. However, after years of menstruation, we worked hard on raw material selection, formula modulation, process optimization, etc. Gradually, halogen-free flame retardant masterbatch was invented, which has the advantages of flame retardant, high efficiency, environmental protection and non-toxicity. It meets the needs of the times and has emerged in many fields, opening a new chapter of flame retardant materials for future generations.
Then we thought of innovation and developed halogen-free flame retardant masterbatches. At the beginning, the road of exploration was full of thorns, and the performance indicators were difficult to meet expectations. However, after years of menstruation, we worked hard on raw material selection, formula modulation, process optimization, etc. Gradually, halogen-free flame retardant masterbatch was invented, which has the advantages of flame retardant, high efficiency, environmental protection and non-toxicity. It meets the needs of the times and has emerged in many fields, opening a new chapter of flame retardant materials for future generations.
Product Overview
Today, there is a new halogen-based flame retardant masterbatch, named Halogen-Free Flame Retardant Masterbatch. This product is a chemical research institute and is specially designed for flame retardant needs. Its quality is pure and its performance is outstanding, and it can play a high-efficiency flame retardant role in a variety of materials.
This product does not have halogen ingredients and conforms to the general trend of environmental protection. It is not only halogen-free, but also highly flame retardant and ensures material safety. Its performance is stable, temperature and weather resistance, and good compatibility with various substrates, without damaging the original properties of the material. It is widely used in rubber, plastics, fiber and other industries, and can greatly improve the flame retardant grade of materials, protect the safety of people and property, and is also a good product in the field of chemical flame retardant.
This product does not have halogen ingredients and conforms to the general trend of environmental protection. It is not only halogen-free, but also highly flame retardant and ensures material safety. Its performance is stable, temperature and weather resistance, and good compatibility with various substrates, without damaging the original properties of the material. It is widely used in rubber, plastics, fiber and other industries, and can greatly improve the flame retardant grade of materials, protect the safety of people and property, and is also a good product in the field of chemical flame retardant.
Physical & Chemical Properties
Since modern times, halogen-based flame retardant masterbatch has been widely used in the field of material fire protection. However, when it burns, it releases a lot of toxic fumes, which is very harmful. Therefore, the research and development of halogen-free flame retardant masterbatch has been done to achieve both material safety and environmental protection.
The physical and chemical properties of halogen-free flame retardant masterbatch are unique. Its thermal stability is good, and it is not easy to decompose in high temperature environment, which can ensure the stable performance of the material during processing and use. And it has good compatibility with a variety of polymer materials, and it is evenly dispersed without damaging the original mechanical properties of the material. In terms of chemical structure, it contains flame retardant elements such as phosphorus and nitrogen, which exert flame retardant efficiency through mechanisms such as dehydration and Its flame retardant efficiency is high, and a small amount of addition can significantly enhance the flame retardant grade of the material, providing a strong guarantee for the fire safety of the material. It has broad prospects in today's material field.
The physical and chemical properties of halogen-free flame retardant masterbatch are unique. Its thermal stability is good, and it is not easy to decompose in high temperature environment, which can ensure the stable performance of the material during processing and use. And it has good compatibility with a variety of polymer materials, and it is evenly dispersed without damaging the original mechanical properties of the material. In terms of chemical structure, it contains flame retardant elements such as phosphorus and nitrogen, which exert flame retardant efficiency through mechanisms such as dehydration and Its flame retardant efficiency is high, and a small amount of addition can significantly enhance the flame retardant grade of the material, providing a strong guarantee for the fire safety of the material. It has broad prospects in today's material field.
Technical Specifications & Labeling
Halogen-based flame retardants are limited due to environmental protection issues, and halogen-free flame retardant masterbatches came into being. Its technical specifications and identification (product parameters) are crucial.
Halogen-free flame retardant masterbatch technical specifications need to clarify the composition to ensure halogen-free and efficient flame retardant. Its flame retardant performance indicators, such as oxygen index, should meet specific standards to ensure effective flame retardant in different scenarios. Thermal stability is also critical, and it needs to withstand high temperatures during processing.
In terms of identification, the product label should clearly indicate "Halogen - Free Flame Retardant Masterbatch", and detail parameters, such as ingredient ratio, applicable materials, so that customers can accurately grasp product characteristics, ensure product compliance and meet the requirements of use, in order to meet the market demand for environmentally friendly flame retardant materials.
Halogen-free flame retardant masterbatch technical specifications need to clarify the composition to ensure halogen-free and efficient flame retardant. Its flame retardant performance indicators, such as oxygen index, should meet specific standards to ensure effective flame retardant in different scenarios. Thermal stability is also critical, and it needs to withstand high temperatures during processing.
In terms of identification, the product label should clearly indicate "Halogen - Free Flame Retardant Masterbatch", and detail parameters, such as ingredient ratio, applicable materials, so that customers can accurately grasp product characteristics, ensure product compliance and meet the requirements of use, in order to meet the market demand for environmentally friendly flame retardant materials.
Preparation Method
The method of making halogen-free flame retardant masterbatch is the key to raw materials and production process. Take organophosphorus-based flame retardants, inorganic flame retardants, synergistic agents, etc. as raw materials. Organic phosphorus, such as phosphate esters, have good flame retardancy. Inorganic flame retardants, such as aluminum hydroxide, can reduce the combustion rate.
Its production process, first prepare the raw materials according to a specific ratio. Then mix evenly with a high-speed mixer to make the ingredients blend. Then melt blending and granulation through a twin-screw extruder, and rotate with a screw to achieve good dispersion and plasticization.
The reaction step is also required. When the raw materials are mixed, the molecules interact, melt blending, chemical bond recombination, and give the product excellent performance. In this process, temperature control, speed control, and reasonable reaction conditions are set to ensure product quality.
In addition, a quality monitoring mechanism is established to check in all links to ensure that the product meets standards. In this way, high-quality halogen-free flame retardant masterbatch can be obtained.
Its production process, first prepare the raw materials according to a specific ratio. Then mix evenly with a high-speed mixer to make the ingredients blend. Then melt blending and granulation through a twin-screw extruder, and rotate with a screw to achieve good dispersion and plasticization.
The reaction step is also required. When the raw materials are mixed, the molecules interact, melt blending, chemical bond recombination, and give the product excellent performance. In this process, temperature control, speed control, and reasonable reaction conditions are set to ensure product quality.
In addition, a quality monitoring mechanism is established to check in all links to ensure that the product meets standards. In this way, high-quality halogen-free flame retardant masterbatch can be obtained.
Chemical Reactions & Modifications
Since modern times, halogen-based flame retardants have been widely used in various materials, but they produce toxic fumes when burned, which harm the environment and people. Therefore, the research and development of halogen-free flame retardant masterbatch is a top priority.
In terms of chemical response, halogen-free flame retardant masterbatch uses elements such as phosphorus and nitrogen to cooperate. When heated, it may dehydrate into carbon, or produce gas to trap oxygen, in order to achieve the effect of flame retardancy. Its response mechanism is exquisite, and it is efficient and low-toxic.
When it comes to modification, the developers use nanotechnology and surface modification methods to increase the compatibility between halogen-free flame retardant masterbatch and matrix materials, improve dispersion, and then strengthen the comprehensive properties of materials. In this way, halogen-free flame retardant masterbatch not only has flame retardant ability, but also does not damage the original characteristics of the material, and has broad prospects for industry and people's livelihood.
In terms of chemical response, halogen-free flame retardant masterbatch uses elements such as phosphorus and nitrogen to cooperate. When heated, it may dehydrate into carbon, or produce gas to trap oxygen, in order to achieve the effect of flame retardancy. Its response mechanism is exquisite, and it is efficient and low-toxic.
When it comes to modification, the developers use nanotechnology and surface modification methods to increase the compatibility between halogen-free flame retardant masterbatch and matrix materials, improve dispersion, and then strengthen the comprehensive properties of materials. In this way, halogen-free flame retardant masterbatch not only has flame retardant ability, but also does not damage the original characteristics of the material, and has broad prospects for industry and people's livelihood.
Synonyms & Product Names
Today there are halogen-free halogen flame retardant masterbatches, with different names, all of which are of the same kind. The ancients said: "Things have the same reality but different names." This halogen-free halogen-retardant flame retardant masterbatch also has many other names. Or "halogen-free flame retardant masterbatch", or "halogen-free fire retardant masterbatch", although the names are different, they all refer to the same product. Its flame retardant and halogen-free harm are widely used in various industries. Or used in plastic products to greatly increase its fire resistance; or used in fiber fabrics to make it difficult to burn in case of fire. These names all refer to the same object, which was born to help fire safety in various industries. In today's production and life, it is really beneficial, helping with fire prevention and protecting people's safety.
Safety & Operational Standards
Code for Safety and Operation of Halogen-Free Flame Retardant Masterbatches
Halogen-free flame retardant masterbatches are widely used in this world. It is related to safety and operation regulations and cannot be ignored.
In the way of storage, it must be placed in a cool, dry and ventilated place. Avoid direct sunlight and avoid rain. This is due to the intensity of sunlight, or the properties of the masterbatch may change; the wetness of rain can also damage its quality. And it should be stored separately from other things to prevent mutual influence and keep it pure.
When taking it, keep your hands and utensils clean. Unclean things mixed in it will damage its quality. The amount should be used according to the needs of the things made, and it should be accurate. Do not overdo it or lack it. If it is too expensive and may cause performance deviation, it will not achieve the effect of flame retardancy.
In the operating environment, air circulation is essential. Due to the presence of odor and dust between operations, the circulating air can be dispersed to protect the health of the operator. And the operator should be in front of protective equipment, such as masks and gloves. The mask can prevent dust from entering the body, and the gloves can avoid the connection between the masterbatch and the skin, and avoid allergies and other diseases.
Furthermore, the cleaning and maintenance of the equipment should not be neglected. After use, the equipment must be cleaned to remove the remaining masterbatch. Otherwise, it will accumulate fouling for a long time, causing the equipment to run poorly, and affecting the effect of the next use.
There are also regulations for disposing of waste. Do not discard them at will, when in accordance with the law of environmental protection, collect them in categories and dispose of them properly.
In this way, strictly abide by the regulations on the safety and operation of halogen-free flame retardant masterbatches, in order to ensure smooth production, protect the safety of personnel, and meet the requirements of environmental protection.
Halogen-free flame retardant masterbatches are widely used in this world. It is related to safety and operation regulations and cannot be ignored.
In the way of storage, it must be placed in a cool, dry and ventilated place. Avoid direct sunlight and avoid rain. This is due to the intensity of sunlight, or the properties of the masterbatch may change; the wetness of rain can also damage its quality. And it should be stored separately from other things to prevent mutual influence and keep it pure.
When taking it, keep your hands and utensils clean. Unclean things mixed in it will damage its quality. The amount should be used according to the needs of the things made, and it should be accurate. Do not overdo it or lack it. If it is too expensive and may cause performance deviation, it will not achieve the effect of flame retardancy.
In the operating environment, air circulation is essential. Due to the presence of odor and dust between operations, the circulating air can be dispersed to protect the health of the operator. And the operator should be in front of protective equipment, such as masks and gloves. The mask can prevent dust from entering the body, and the gloves can avoid the connection between the masterbatch and the skin, and avoid allergies and other diseases.
Furthermore, the cleaning and maintenance of the equipment should not be neglected. After use, the equipment must be cleaned to remove the remaining masterbatch. Otherwise, it will accumulate fouling for a long time, causing the equipment to run poorly, and affecting the effect of the next use.
There are also regulations for disposing of waste. Do not discard them at will, when in accordance with the law of environmental protection, collect them in categories and dispose of them properly.
In this way, strictly abide by the regulations on the safety and operation of halogen-free flame retardant masterbatches, in order to ensure smooth production, protect the safety of personnel, and meet the requirements of environmental protection.
Application Area
Today there are halogen-free halogen flame retardant masterbatch products, which have a wide range of application fields. In the field of electronic appliances, the shell of electronic products needs to be fireproof and safe. This masterbatch can give the shell flame retardant properties and ensure the safety of use. In terms of building materials, the introduction of this product into boards, thermal insulation materials, etc. can greatly improve the fire protection level and prevent the spread of fire. In car interiors, seats, dashboards and other materials are treated with it to be flame retardant and reduce toxic smoke generation, protecting the safety of drivers and passengers. And in the textile field, fabrics can be flame retardant after being treated with this masterbatch auxiliary agent, which can be used for fabrics such as tooling and curtains to reduce fire hazards. Its wide application has made outstanding contributions to fire safety in various industries, and it is indeed an indispensable material.
Research & Development
In recent years, Yu has dedicated himself to the research and development of Halogen - Free Flame Retardant Masterbatch. This material is halogen-free and flame retardant, which is of great significance to safety and environmental protection.
At the beginning, the road to exploration was full of thorns. Raw material screening requires weighing multiple characteristics; process optimization, often repeated trial and error. However, Yu and colleagues are determined to study day and night.
After a long time of hard work, we have finally achieved success. The products made have excellent performance, significant flame retardant effect, and meet the strict standards of environmental protection. This achievement has not only been widely praised in the academic community, but also has a bright future for industrial applications. Looking to the future, we hope to build on this foundation, continue to improve, promote the development of the industry, and contribute to the progress of society.
At the beginning, the road to exploration was full of thorns. Raw material screening requires weighing multiple characteristics; process optimization, often repeated trial and error. However, Yu and colleagues are determined to study day and night.
After a long time of hard work, we have finally achieved success. The products made have excellent performance, significant flame retardant effect, and meet the strict standards of environmental protection. This achievement has not only been widely praised in the academic community, but also has a bright future for industrial applications. Looking to the future, we hope to build on this foundation, continue to improve, promote the development of the industry, and contribute to the progress of society.
Toxicity Research
In today's world, although halogen-based flame retardants have been commonly used for fire protection, their toxicity is gradually becoming apparent. My generation is a chemical researcher, dedicated to the toxicity study of halogen-free flame retardant masterbatch.
Halogen-free flame retardant masterbatch, want to replace halogen-based. Examine its ingredients carefully, and choose non-toxic or low-toxic substances, which are made by exquisite proportions and advanced processes. Experiments have shown that its combustion products have less harmful gases and smoke, and do not produce highly toxic hydrogen halides such as halogen-based. Biotoxicity tests also show that its harm to organisms is minimal. Therefore, halogen-free flame retardant masterbatch is at the toxic end, which is significantly better than halogen-based flame retardants, and can be a good choice for safe fire protection. It has broad prospects in the field of material fire protection in the future.
Halogen-free flame retardant masterbatch, want to replace halogen-based. Examine its ingredients carefully, and choose non-toxic or low-toxic substances, which are made by exquisite proportions and advanced processes. Experiments have shown that its combustion products have less harmful gases and smoke, and do not produce highly toxic hydrogen halides such as halogen-based. Biotoxicity tests also show that its harm to organisms is minimal. Therefore, halogen-free flame retardant masterbatch is at the toxic end, which is significantly better than halogen-based flame retardants, and can be a good choice for safe fire protection. It has broad prospects in the field of material fire protection in the future.
Future Prospects
Today there are Halogen - Free Flame Retardant Masterbatch products, which have a good future in the field of flame retardant. Although there are many categories of flame retardant materials in the current market, this halogen-free flame retardant masterbatch, with its environmentally friendly and halogen-free characteristics, is in line with the general trend of future development.
Not yet, with the growing awareness of environmental protection and stricter regulations, traditional halogen-containing flame retardants are gradually being abandoned. This Halogen - Free Flame Retardant Masterbatch is sure to gain more favor. Its application will also be expanded to electronics, textiles, construction and other fields, driving safety and environmental protection in various industries. In this way, its market scale is expected to continue to expand, becoming a bright new star in the flame retardant industry, leading the future change and development of flame retardant materials.
Not yet, with the growing awareness of environmental protection and stricter regulations, traditional halogen-containing flame retardants are gradually being abandoned. This Halogen - Free Flame Retardant Masterbatch is sure to gain more favor. Its application will also be expanded to electronics, textiles, construction and other fields, driving safety and environmental protection in various industries. In this way, its market scale is expected to continue to expand, becoming a bright new star in the flame retardant industry, leading the future change and development of flame retardant materials.
Where to Buy Halogen-Free Flame Retardant Masterbatch in China?
As a trusted Halogen-Free Flame Retardant Masterbatch manufacturer, we deliver:
Factory-Direct Value: Competitive pricing with no middleman markups, tailored for bulk orders and project-scale requirements.
Technical Excellence: Precision-engineered solutions backed by R&D expertise, from formulation to end-to-end delivery.
Whether you need industrial-grade quantities or specialized customizations, our team ensures reliability at every stage—from initial specification to post-delivery support.
As a leading Halogen-Free Flame Retardant Masterbatch supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.
What are the main application fields of halogen-free flame retardant masterbatch?
The main application fields of halogen-free flame retardant wood-plastic cover a wide range of fields. In the field of construction, it is often the choice for indoor and outdoor decoration. For example, exterior wall hanging panels, made of halogen-free flame retardant wood-plastic, have fire retardant and flame retardant performance, and have both the beauty of wood and the durability of plastic, can withstand wind and rain erosion, and keep the appearance of the building as new for a long time. Interior floors, ceilings and other decorative materials are also commonly used, which can create a warm living atmosphere, ensure fire safety, and provide a stable environment for residents.
In the field of furniture manufacturing, there are also many applications. Furniture such as tables, chairs, cabinets, etc., use halogen-free flame retardant wood-plastic, which not only meets people's pursuit of wood texture, but also improves Furniture in public places, such as hotels, restaurants, libraries, etc., this feature is particularly critical, which can effectively reduce fire hazards and ensure the safety of people's lives and property.
Furthermore, in terms of garden landscapes, halogen-free flame retardant wood plastics are also very popular. Facilities such as plank roads, flower stands, pavilions and other facilities in parks use halogen-free flame retardant wood plastics, which can not only integrate with the natural landscape and add a quaint charm to the garden, but also because of its fire resistance, it can cope with complex outdoor environments, reduce fire risks, and enable the garden landscape to survive for a long time.
In the transportation field, halogen-free flame retardant wood plastics are gradually used for decoration materials in public places such as stations and docks. Due to its fire-proof, moisture-proof, insect-proof and other characteristics, it can adapt to the crowded and complex environment of traffic places, providing passengers with a safe and comfortable waiting space. In addition, the interior decoration materials of the carriage are made of halogen-free flame-retardant wood-plastic, which can also delay the spread of fire in emergencies and gain valuable time for personnel evacuation.
How is the flame retardant effect of halogen-free flame retardant masterbatch?
"Tiangong Kaiwu" says: "Where firewood is made, it is taken from all mountains and forests. Although it belongs to plants and trees, it is indispensable for people's livelihood." The flame retardant effect of leafless flame retardant bamboo charcoal is related to people's daily use, and it is also important in the world.
Leafless flame retardant bamboo charcoal, its production is exquisite. Select high-quality bamboo materials, through multiple processes, calcined with special skills. This charcoal has a dense texture and a unique structure. It is the foundation of flame retardancy. Its flame retardant effect is like a barrier, and it is stable in case of fire. When fire invades, bamboo charcoal is like a strong shield, delaying the spread of fire, and it is not flammable by itself, adding help to protection.
From a physical perspective, the internal microporous structure of leafless flame retardant bamboo charcoal is rich, like countless tiny mazes. When the flame is in contact, the heat detours between the micropores, the conduction is blocked, and the temperature rise slows down. And a dense carbonized layer can be formed on its surface, which isolates oxygen like armor, making the flame unsustainable.
From a chemical point of view, bamboo charcoal contains special chemical components. When exposed to high temperatures, a series of chemical reactions occur. Some components decompose and absorb heat, reducing the surrounding temperature; some generate non-flammable gases, diluting the oxygen concentration, and missing combustion conditions. These many factors cooperate to achieve a good flame retardant effect of leafless flame retardant bamboo charcoal.
In practical applications, leafless flame retardant bamboo charcoal is widely used in construction, home and other fields. Added to building materials, it can improve the overall fire performance and protect the safety of the house; household items are integrated, such as bamboo charcoal mattresses, bamboo charcoal wallpaper, etc., to add fire protection to the living space.
Leafless flame retardant bamboo charcoal, with its unique properties, has made outstanding contributions to flame retardant and created a safer environment for the world.
What are the advantages of halogen-free flame retardant masterbatch compared with traditional flame retardants?
Compared with traditional stoves, flameless catalytic charcoal has many benefits.
First, it saves firewood and is efficient. Traditional stoves turn into ashes before they burn out, and lose a lot. After special catalysis, flameless catalytic charcoal can be fully burned out, and the utilization rate has been greatly improved. In the past, several bundles of firewood were required to cook meals. Today, flameless catalytic charcoal is only used for half of the time, which is twice the result with half the effort. The consumption of firewood is greatly reduced, which is especially important in places where firewood is scarce.
Second, it is clean and environmentally friendly. When traditional stoves burn, thick smoke billows and dust fills the place, which not only blackens the residence, but also pollutes the atmosphere. Flameless catalytic charcoal catalytic combustion greatly reduces smoke emissions, produces little smoke, and is environmentally friendly. For use at home, it can keep the indoor fresh and clean; for use outdoors, it will not cause serious pollution to the surrounding environment.
Third, easy to operate. Traditional stove ignition requires cumbersome ignition processes, and the heat is difficult to control. If the fire is too prosperous, it is easy to burn, and if it is too small, it is time-consuming. Flameless catalytic charcoal ignition is convenient. With the catalytic mechanism, the fire is stable. It can be simply adjusted according to cooking needs. Even those who lack cooking experience can easily control it.
Fourth, it is safe and reliable. Traditional stoves have open fires, sparks splash everywhere, and fires can be caused by a little carelessness. Flameless catalytic charcoal has no open flame, and the catalytic reaction is mild, which greatly reduces the fire hazard. It adds to the safety protection for children or people with limited mobility at home.
In summary, flameless catalytic charcoal has significant advantages over traditional stoves in terms of firewood utilization, environmental protection, operation and safety, and may be a new choice for future cooking.
What is the general amount of halogen-free flame retardant masterbatch added?
The laying of ballastless track slabs is related to the smooth and safe operation of railways. All aspects of its construction need to be precisely controlled, among which the amount of admixture is particularly critical.
Generally speaking, the amount of admixture added to ballastless track slabs should be determined comprehensively according to the characteristics of the cement and aggregate used, as well as the temperature and humidity of the construction environment. Under normal circumstances, its dosage is about 0.5% - 2.5% of the quality of the cementitious material. The setting of this range is verified by a large number of tests and engineering practices.
If the amount of admixture added is too small, it is difficult to exert its due effect. If the amount of water reducing agent is insufficient, the fluidity of the concrete is not good, and it is not easy to percolate and vibrate, resulting in defects such as honeycomb pitting surface inside the track slab, which affects its appearance quality and structural strength. If the amount of retarder is too small, the concrete setting time is too fast, and the continuity of perfusion cannot be guaranteed during the construction process or due to time constraints, which in turn affects the overall quality of the track slab.
On the contrary, if the amount of additive is too much, it will also cause many problems. If there is too much water reducing agent, although it can greatly improve the fluidity of the concrete, it may cause the concrete to leak water and segregate, reducing its durability; if there is too much air entraining agent, the air content of the concrete is too high
Although "Tiangong Kaiwu" does not detail the amount of additives added to ballastless track slabs, its concept of "ingenious creation, benefit from materials and people" still has reference significance in the construction of ballastless track slabs today. The builder should take a scientific and rigorous attitude to accurately measure and control the amount of additives added to ensure the high quality of ballastless track slabs, just like the ancient skilled craftsmen carefully carved utensils, to create a stable and durable railway cornerstone.
Effect of Halogen-free Flame Retardant Masterbatch on Physical Properties of Materials
Halogen-free flame retardant wood-plastic has many effects on the physical properties of materials.
In terms of mechanical properties, on the one hand, the strength of wood-plastic materials may change after adding halogen-free flame retardants. When added in an appropriate amount, the tensile strength and flexural strength may be improved due to the formation of a certain interaction between the flame retardant and the wood powder and plastic matrix, which enhances the interface bonding force to a certain extent. However, if the amount of addition is too large, the flame retardant particles may be unevenly dispersed in the matrix, forming stress concentration points, resulting in an increase in internal defects of the material, resulting in a decrease in tensile and flexural strength. For example, when a specific halogen-free flame retardant is added more than 15%, the tensile strength of wood-plastic composites is reduced by about 10% compared with that without addition. On the other hand, the impact strength is also often affected. The addition of halogen-free flame retardants changes the toughness of the material, and the rigidity of some flame retardants will reduce the toughness of the material, resulting in a reduction in impact strength. However, some halogen-free flame retardants with toughening effect can maintain or even improve the impact strength under a reasonable amount of addition.
In terms of thermal properties, halogen-free flame retardants can significantly change the thermal stability of wood-plastic materials. It can form an isolation layer when the material is heated, hindering heat transfer and increasing the thermal decomposition temperature. Inorganic halogen-free flame retardants such as magnesium hydroxide can decompose and absorb a lot of heat by heat, delay the thermal degradation of materials, improve their thermal stability, and enable wood-plastic materials to maintain structural stability for longer in high-temperature environments, thereby expanding their application range in scenes with high thermal stability requirements.
In terms of processing performance, the addition of halogen-free flame retardants may affect the melt fluidity of wood-plastic materials. Some flame retardants will increase the viscosity of the system and reduce the melt fluidity, making the material more difficult in extrusion, injection molding and other processing processes. It is necessary to adjust the processing parameters, such as increasing the processing temperature and increasing the screw speed, to ensure the smooth molding of the material. However, improper adjustment may have a negative impact on the material properties.
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