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Inorganic flame retardant for epoxy resin
2017-11-25 11:09:27
Inorganic flame retardant for epoxy resin
The inorganic flame retardant for epoxy resin has the advantages of good thermal stability, non volatilization, no corrosion and toxic gas, and the price is cheap. The main varieties are: aluminum hydroxide, magnesium hydroxide, red phosphorus, antimony oxide, molybdenum oxide, zirconium oxide, ammonium molybdate, zinc borate and aluminum hydroxide (ATH), which accounted for more than 80% of inorganic flame retardant.
Because the flame retardant effect of inorganic flame retardant for epoxy resin is poor, the new technology must be adopted when adding large amount of inorganic flame retardant. The development trend of inorganic flame retardant for epoxy resin includes ultra refinement, surface modification, macromolecular bonding and so on.
Surface modification of inorganic flame retardant. Inorganic flame retardant has strong polarity and hydrophilicity, and it has poor compatibility with non-polar polymer materials, and the interface is difficult to form good bonding and adhesion. In order to improve the adhesion and interfacial affinity between polymer and polymer, coupling agent is one of the most effective methods for surface treatment. Silane and titanate are commonly used coupling agents.
Silane treated ATH has good flame retardant effect, can effectively improve the flexural strength of polyester and tensile strength of epoxy resin; ATH treated by vinyl silane can be used to improve the flame retardancy, heat resistance and humidity resistance of crosslinked ethylene vinyl acetate copolymer. Titanate coupling agent and silane coupling agent can be used together to produce synergistic effect. After ATH surface active surface modification has been improved, and increase the resin affinity between, improve the physical and mechanical properties of products, increase the flowability of the resin, reduce the absorption rate of the surface of ATH, improve the electrical properties of flame retardant products, but also can improve flame retardant effect by V1 to the V0 level.
Ultra fining of inorganic flame retardant. At present, ultrafine and nano ATH is the main research and development direction. A large amount of ATH will reduce the mechanical properties of the material, and the super fine, especially nano ATH filled plastic will play the role of rigid particles plasticizing enhancement.
This is because the flame retardant action is dominated by chemical reaction, for the same amount of flame retardant, the smaller the particle size, the greater the specific surface area, the better the flame retardant effect. On the other hand, ultrafine and nanocrystalline ATH can enhance the interfacial interaction, and can be more evenly dispersed in the matrix resin, which can improve the mechanical properties of the blends more effectively. For example, if the ATH with a particle size of 10 m is filled in LDPE/EVA, the extrusion capacity can be increased by 40%.
In the fire, smoke is the first and the most lethal and delaying the fire fighting time factors, so the contemporary "flame" is compared with "smoke", and on certain plastics, such as PVC, "smoke" is more important than the "flame". Halogen containing polymers, halogenated flame retardants and antimony compounds are the main sources of tobacco smoke.
Triphenyl Phosphate (TPP)
Flame retardant TPP has many advantages, such as excellent transparency, softness, bacterial resistance, and water proof, grease-proof, good electric insulation, as well as good compatibility. Flame retardant TPP is mainly used as the flame-retardant plasticizer for cellulose resin, vinyl resin, natural rubber and synthetic rubber. And it may also be used as the flame-retardant plasticizer for glyceryl triacetate thin ester and film, rigid polyurethane foam, phenolic aldehyde resin, and PPO, etc.
Flame retardant TPP is a kind of halogen-free environment-friendly flame retardant with phosphorus element. Most of the products in the market are self-colored flaky crystal, our product is self-colored crystalline powder, and is more soluble in organic solvents. TPP is not soluble in water, but soluble in benzene, chloroform, ether and acetone, and slightly soluble in Z alcohol. Flame retardant TPP is nonflammable with slight aromatic odor and slight deliquescence. The fusion point is about 50 ℃, and fast melts to hoop-shape when heated. The lubricate effect is excellent, and it is often used as the flame retardant plasticize lubricant. What is more, it is used as the flame retardant for many plastics and resins, such as phenolic aldehyde resin, epoxy resin and so on.
Therefore, in addition to the non halogen flame retardant is the main way to reduce the amount of smoke, the addition of smoke suppressants to PVC and other halogen containing polymers is another measure to solve the problem of smoke. Molybdenum compounds have been regarded as the best smoke suppressants, for example, Kegad911A is a complex containing a small amount of zinc and molybdenum, and the addition of 4% in PVC can reduce the smoke content of the polymer by 1/3.
The molybdenum compound is more expensive, the zinc borate, two ferrocene, aluminum hydroxide, silicon compounds and a small amount of molybdenum compound, is a realistic way to solve the problem of smoke, such as MolyFR201 is a compound of ammonium molybdate and aluminum hydroxide, add in PVC from 5 to 10, the amount of smoke can be reduced by 43%.
Microencapsulation technology can prevent the migration of flame retardants, improve the flame retardant effectiveness, improve the thermal stability, change the dosage form and many other advantages. It is also beneficial to the composition and synergism between components, and the manufacture of multi-functional flame retardant materials.
China is currently being explored, such as the Hunan Plastics Research Institute has developed a microencapsulated red phosphorus masterbatch, successfully applied in PE, PP, PS, ABS resin, flame retardant effect is good. The micro capsule Anhui Chemical Research Institute developed the phosphorylation of two bromobenzene ester, microencapsulation of chlorinated paraffin 70, have achieved very good results.
The flame retardant properties of crosslinked polymer is much better than linear polymers, thus adding a small amount of crosslinking agent in thermoplastic processing, plastics to become part of network structure, not only can improve the dispersion of flame retardant, and to produce plastic carbon combustion, flame retardancy, and can increase the mechanical properties of products weather and heat resistance etc.. For example, a small amount of quaternary ammonium salt is added into the soft PVC to make it cross linked flame retardant material, and the crosslinking of the polymer can be made by radiation method, adding metal oxide and cross-linking agent, etc..
PAPPP is the two Phenylphosphonic chloride and p-aminophenol as raw materials by diazotization and interfacial polycondensation reaction system, the compound has high decomposition temperature and residual low, has good flame retardancy; PBPPP is Phenylphosphonic two chlorine and four tetrabromobisphenol A as raw materials by melt polycondensation synthesis, products with high molecular weight, good thermal stability, has good flame resistance of PET.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The inorganic flame retardant for epoxy resin has the advantages of good thermal stability, non volatilization, no corrosion and toxic gas, and the price is cheap. The main varieties are: aluminum hydroxide, magnesium hydroxide, red phosphorus, antimony oxide, molybdenum oxide, zirconium oxide, ammonium molybdate, zinc borate and aluminum hydroxide (ATH), which accounted for more than 80% of inorganic flame retardant.
Because the flame retardant effect of inorganic flame retardant for epoxy resin is poor, the new technology must be adopted when adding large amount of inorganic flame retardant. The development trend of inorganic flame retardant for epoxy resin includes ultra refinement, surface modification, macromolecular bonding and so on.
Surface modification of inorganic flame retardant. Inorganic flame retardant has strong polarity and hydrophilicity, and it has poor compatibility with non-polar polymer materials, and the interface is difficult to form good bonding and adhesion. In order to improve the adhesion and interfacial affinity between polymer and polymer, coupling agent is one of the most effective methods for surface treatment. Silane and titanate are commonly used coupling agents.
Silane treated ATH has good flame retardant effect, can effectively improve the flexural strength of polyester and tensile strength of epoxy resin; ATH treated by vinyl silane can be used to improve the flame retardancy, heat resistance and humidity resistance of crosslinked ethylene vinyl acetate copolymer. Titanate coupling agent and silane coupling agent can be used together to produce synergistic effect. After ATH surface active surface modification has been improved, and increase the resin affinity between, improve the physical and mechanical properties of products, increase the flowability of the resin, reduce the absorption rate of the surface of ATH, improve the electrical properties of flame retardant products, but also can improve flame retardant effect by V1 to the V0 level.
Ultra fining of inorganic flame retardant. At present, ultrafine and nano ATH is the main research and development direction. A large amount of ATH will reduce the mechanical properties of the material, and the super fine, especially nano ATH filled plastic will play the role of rigid particles plasticizing enhancement.
This is because the flame retardant action is dominated by chemical reaction, for the same amount of flame retardant, the smaller the particle size, the greater the specific surface area, the better the flame retardant effect. On the other hand, ultrafine and nanocrystalline ATH can enhance the interfacial interaction, and can be more evenly dispersed in the matrix resin, which can improve the mechanical properties of the blends more effectively. For example, if the ATH with a particle size of 10 m is filled in LDPE/EVA, the extrusion capacity can be increased by 40%.
In the fire, smoke is the first and the most lethal and delaying the fire fighting time factors, so the contemporary "flame" is compared with "smoke", and on certain plastics, such as PVC, "smoke" is more important than the "flame". Halogen containing polymers, halogenated flame retardants and antimony compounds are the main sources of tobacco smoke.
Triphenyl Phosphate (TPP)
Flame retardant TPP has many advantages, such as excellent transparency, softness, bacterial resistance, and water proof, grease-proof, good electric insulation, as well as good compatibility. Flame retardant TPP is mainly used as the flame-retardant plasticizer for cellulose resin, vinyl resin, natural rubber and synthetic rubber. And it may also be used as the flame-retardant plasticizer for glyceryl triacetate thin ester and film, rigid polyurethane foam, phenolic aldehyde resin, and PPO, etc.
Flame retardant TPP is a kind of halogen-free environment-friendly flame retardant with phosphorus element. Most of the products in the market are self-colored flaky crystal, our product is self-colored crystalline powder, and is more soluble in organic solvents. TPP is not soluble in water, but soluble in benzene, chloroform, ether and acetone, and slightly soluble in Z alcohol. Flame retardant TPP is nonflammable with slight aromatic odor and slight deliquescence. The fusion point is about 50 ℃, and fast melts to hoop-shape when heated. The lubricate effect is excellent, and it is often used as the flame retardant plasticize lubricant. What is more, it is used as the flame retardant for many plastics and resins, such as phenolic aldehyde resin, epoxy resin and so on.
Therefore, in addition to the non halogen flame retardant is the main way to reduce the amount of smoke, the addition of smoke suppressants to PVC and other halogen containing polymers is another measure to solve the problem of smoke. Molybdenum compounds have been regarded as the best smoke suppressants, for example, Kegad911A is a complex containing a small amount of zinc and molybdenum, and the addition of 4% in PVC can reduce the smoke content of the polymer by 1/3.
The molybdenum compound is more expensive, the zinc borate, two ferrocene, aluminum hydroxide, silicon compounds and a small amount of molybdenum compound, is a realistic way to solve the problem of smoke, such as MolyFR201 is a compound of ammonium molybdate and aluminum hydroxide, add in PVC from 5 to 10, the amount of smoke can be reduced by 43%.
Microencapsulation technology can prevent the migration of flame retardants, improve the flame retardant effectiveness, improve the thermal stability, change the dosage form and many other advantages. It is also beneficial to the composition and synergism between components, and the manufacture of multi-functional flame retardant materials.
China is currently being explored, such as the Hunan Plastics Research Institute has developed a microencapsulated red phosphorus masterbatch, successfully applied in PE, PP, PS, ABS resin, flame retardant effect is good. The micro capsule Anhui Chemical Research Institute developed the phosphorylation of two bromobenzene ester, microencapsulation of chlorinated paraffin 70, have achieved very good results.
The flame retardant properties of crosslinked polymer is much better than linear polymers, thus adding a small amount of crosslinking agent in thermoplastic processing, plastics to become part of network structure, not only can improve the dispersion of flame retardant, and to produce plastic carbon combustion, flame retardancy, and can increase the mechanical properties of products weather and heat resistance etc.. For example, a small amount of quaternary ammonium salt is added into the soft PVC to make it cross linked flame retardant material, and the crosslinking of the polymer can be made by radiation method, adding metal oxide and cross-linking agent, etc..
PAPPP is the two Phenylphosphonic chloride and p-aminophenol as raw materials by diazotization and interfacial polycondensation reaction system, the compound has high decomposition temperature and residual low, has good flame retardancy; PBPPP is Phenylphosphonic two chlorine and four tetrabromobisphenol A as raw materials by melt polycondensation synthesis, products with high molecular weight, good thermal stability, has good flame resistance of PET.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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