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Inorganic flame retardants used in polyolefin materials
2017-12-6 10:42:26
Inorganic flame retardants used in polyolefin materials
With the continuous development of polymer materials science, all kinds of polymer products are widely applied in various sectors such as industry, agriculture and national defense, and have penetrated into all aspects of people's lives.
Since most polymer materials can burn, burns lots of calories, while producing hydrogen chloride, hydrogen cyanide, styrene and other corrosive gases and toxic gases. Therefore, it is becoming more and more important to study the flame retardants of polymer products.
The inorganic flame retardants used in polyolefin materials are generally divided into two types: reactive and additive. Reactive flame retardants mainly introduce flame retardant groups on the main chain or side chain of polymer in the process of polymerization and condensation in order to achieve the purpose of flame retardant. It has the advantages of good stability, uneasy disappearance, small toxicity and small influence on the properties of polymer, but the synthesis and processing technology are complex. The addition type flame retardants are divided into two kinds, inorganic and organic.
The inorganic flame retardants used in polyolefin materials are of high safety and can be used as flame retardants and additives. They also have the advantages of low smoke, no poison, good thermal stability, no corrosive gas and low price. The main varieties are: aluminum hydroxide, magnesium hydroxide, red phosphorus, antimony oxide, molybdenum oxide, zirconium oxide, ammonium molybdate, zinc borate, aluminum hydroxide, magnesium hydroxide, with red phosphorus, antimony oxide is used widely.
The organic flame retardants are divided into two series of phosphorus and halogen. Phosphorus flame retardants are mainly enate esters. They are liquid at room temperature, with large amount of smoke and toxic. The halogen flame retardant consists of two kinds of chlorine and bromine system. The toxicity and corrosiveness of bromine flame retardant are relatively small after thermal decomposition, and the use is more common.
In the field of flame retardancy, the development of high efficiency, low smoke, non-toxic and harmless flame retardant is the long-term goal of the people. The inorganic flame retardants used in polyolefin materials have such characteristics, making it more and more widely used. This paper mainly introduces the flame retardancy mechanism and surface treatment method of inorganic flame retardant used in polyolefin materials.
Triphenyl Phosphate (TPP)
Flame retardant tpp This product has good transparency , flexibility and good benefits antimicrobial resistance, with water, oil, electrical insulation and compatibility. Mainly for the cellulose resin, a vinyl resin, natural rubber and synthetic rubber flame retardant plasticizers may also be used for acetate and glycerol triacetate film thin , rigid polyurethane foam , phenolic resin, and engineering plastics such as resistance PPO burning plasticized . Flame Retardant tpp manufacturer price mainly in Jiangsu .
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.
Mechanism of inorganic flame retardant: Al (OH) 3, Mg (OH) [3 2 flame retardant mechanism of flame retardant, flame retardant 4]Al (OH) 3 is referred to as ATH, the dosage of alumina trihydrate, accounting for more than 80% of inorganic flame retardant. It has three functions of flame retardancy, smoke elimination and filling, which is nonvolatile, non-toxic, small corrosion and low price. It is known as a non pollution flame retardant. Mg (OH) 2 flame retardant also has more features, and Mg (OH) 2 Al (OH) 3 soft, in the logistics mixing and molding equipment to wear less, Mg (OH) 2 thermal decomposition temperature is higher, the mixing and molding temperature caused by heat decomposition and affect the quality of products.
The flame retardancy mechanism of Al (OH) 3 and Mg (OH) 2 is considered to be the result of the synergistic effects of the following mechanisms. Al (OH) 3, Mg (OH) 2 as fillers, the concentration of combustible polymers decreased; dehydration at 300 DEG endothermic, inhibit polymer temperature rise; Al (OH) 3, Mg (OH) 2 release of the water vapor concentration dehydration dilute combustible gas and oxygen, can prevent combustion; Al (OH) 3, Mg (OH) 2 after dehydration combustible surface metal oxide protective layer; isolation effect, stop burning.
The synergistic effect of antimony oxide flame retardant is studied. It is found that antimony oxide itself is not very good in flame retardancy, but it has a great synergistic effect with halogenated flame retardants. This is because the proportion of halogenated antimony, such as SbCl3 and SbBr3, is very large when burning. The surface of polymer plays a covering effect and plays a role in capturing free radicals in gaseous state.
Synergistic effect of red phosphorus red phosphorus when used alone, the flame-retardant effect is not ideal, but as with aluminum hydroxide, magnesium hydroxide flame retardant and flame retardant, has obvious synergistic effect, adding a small amount of red phosphorus can greatly improve the oxygen index. This is because when burning, has a strong role in the dehydration of red phosphorus, aluminum hydroxide, magnesium hydroxide dehydration crystallization to absorb heat, make flame retardant on the flame retardant effect.
There are many kinds of inorganic flame retardant, commonly used with aluminum hydroxide, antimony oxide, magnesium hydroxide, zinc borate, red phosphorus etc.. The largest amount is aluminum hydroxide and magnesium hydroxide. In general, if the particle size is fine enough, antimony oxide, zinc borate, red phosphorus and polymer miscibility is no problem. However, aluminum hydroxide and magnesium hydroxide are easy to agglomerate because of their high polarity and intermolecular hydrogen bonds, which affect their miscibility with polymers and further affect their mechanical properties. Therefore, surface treatment of them is necessary.
The main treatment agent for aluminum hydroxide on the surface of aluminum hydroxide is silane and titanate. Silane coupling agent with vinyl silane treatment effect is better, the single alkyl titanate on coarse particle Al (OH) 3 as the coupling effect of fine grained Al (OH) 3 coupling effect.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
With the continuous development of polymer materials science, all kinds of polymer products are widely applied in various sectors such as industry, agriculture and national defense, and have penetrated into all aspects of people's lives.
Since most polymer materials can burn, burns lots of calories, while producing hydrogen chloride, hydrogen cyanide, styrene and other corrosive gases and toxic gases. Therefore, it is becoming more and more important to study the flame retardants of polymer products.
The inorganic flame retardants used in polyolefin materials are generally divided into two types: reactive and additive. Reactive flame retardants mainly introduce flame retardant groups on the main chain or side chain of polymer in the process of polymerization and condensation in order to achieve the purpose of flame retardant. It has the advantages of good stability, uneasy disappearance, small toxicity and small influence on the properties of polymer, but the synthesis and processing technology are complex. The addition type flame retardants are divided into two kinds, inorganic and organic.
The inorganic flame retardants used in polyolefin materials are of high safety and can be used as flame retardants and additives. They also have the advantages of low smoke, no poison, good thermal stability, no corrosive gas and low price. The main varieties are: aluminum hydroxide, magnesium hydroxide, red phosphorus, antimony oxide, molybdenum oxide, zirconium oxide, ammonium molybdate, zinc borate, aluminum hydroxide, magnesium hydroxide, with red phosphorus, antimony oxide is used widely.
The organic flame retardants are divided into two series of phosphorus and halogen. Phosphorus flame retardants are mainly enate esters. They are liquid at room temperature, with large amount of smoke and toxic. The halogen flame retardant consists of two kinds of chlorine and bromine system. The toxicity and corrosiveness of bromine flame retardant are relatively small after thermal decomposition, and the use is more common.
In the field of flame retardancy, the development of high efficiency, low smoke, non-toxic and harmless flame retardant is the long-term goal of the people. The inorganic flame retardants used in polyolefin materials have such characteristics, making it more and more widely used. This paper mainly introduces the flame retardancy mechanism and surface treatment method of inorganic flame retardant used in polyolefin materials.
Triphenyl Phosphate (TPP)
Flame retardant tpp This product has good transparency , flexibility and good benefits antimicrobial resistance, with water, oil, electrical insulation and compatibility. Mainly for the cellulose resin, a vinyl resin, natural rubber and synthetic rubber flame retardant plasticizers may also be used for acetate and glycerol triacetate film thin , rigid polyurethane foam , phenolic resin, and engineering plastics such as resistance PPO burning plasticized . Flame Retardant tpp manufacturer price mainly in Jiangsu .
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.
Mechanism of inorganic flame retardant: Al (OH) 3, Mg (OH) [3 2 flame retardant mechanism of flame retardant, flame retardant 4]Al (OH) 3 is referred to as ATH, the dosage of alumina trihydrate, accounting for more than 80% of inorganic flame retardant. It has three functions of flame retardancy, smoke elimination and filling, which is nonvolatile, non-toxic, small corrosion and low price. It is known as a non pollution flame retardant. Mg (OH) 2 flame retardant also has more features, and Mg (OH) 2 Al (OH) 3 soft, in the logistics mixing and molding equipment to wear less, Mg (OH) 2 thermal decomposition temperature is higher, the mixing and molding temperature caused by heat decomposition and affect the quality of products.
The flame retardancy mechanism of Al (OH) 3 and Mg (OH) 2 is considered to be the result of the synergistic effects of the following mechanisms. Al (OH) 3, Mg (OH) 2 as fillers, the concentration of combustible polymers decreased; dehydration at 300 DEG endothermic, inhibit polymer temperature rise; Al (OH) 3, Mg (OH) 2 release of the water vapor concentration dehydration dilute combustible gas and oxygen, can prevent combustion; Al (OH) 3, Mg (OH) 2 after dehydration combustible surface metal oxide protective layer; isolation effect, stop burning.
The synergistic effect of antimony oxide flame retardant is studied. It is found that antimony oxide itself is not very good in flame retardancy, but it has a great synergistic effect with halogenated flame retardants. This is because the proportion of halogenated antimony, such as SbCl3 and SbBr3, is very large when burning. The surface of polymer plays a covering effect and plays a role in capturing free radicals in gaseous state.
Synergistic effect of red phosphorus red phosphorus when used alone, the flame-retardant effect is not ideal, but as with aluminum hydroxide, magnesium hydroxide flame retardant and flame retardant, has obvious synergistic effect, adding a small amount of red phosphorus can greatly improve the oxygen index. This is because when burning, has a strong role in the dehydration of red phosphorus, aluminum hydroxide, magnesium hydroxide dehydration crystallization to absorb heat, make flame retardant on the flame retardant effect.
There are many kinds of inorganic flame retardant, commonly used with aluminum hydroxide, antimony oxide, magnesium hydroxide, zinc borate, red phosphorus etc.. The largest amount is aluminum hydroxide and magnesium hydroxide. In general, if the particle size is fine enough, antimony oxide, zinc borate, red phosphorus and polymer miscibility is no problem. However, aluminum hydroxide and magnesium hydroxide are easy to agglomerate because of their high polarity and intermolecular hydrogen bonds, which affect their miscibility with polymers and further affect their mechanical properties. Therefore, surface treatment of them is necessary.
The main treatment agent for aluminum hydroxide on the surface of aluminum hydroxide is silane and titanate. Silane coupling agent with vinyl silane treatment effect is better, the single alkyl titanate on coarse particle Al (OH) 3 as the coupling effect of fine grained Al (OH) 3 coupling effect.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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