News Details
Polyethylene resin flame retardant
2017-11-13 10:48:27
Polyethylene resin flame retardant
Polyethylene resin has many advantages: lightweight, non-toxic, anti impact performance, and low price, easy processing, each department has been widely used in the national production. However, due to its flammability (oxygen index is only 1714), and combustion with melting drop phenomenon, it is necessary to improve its flame retardant properties can be safely used.
From heating to combustion, polyethylene undergoes several processes such as melting depolymerization, decomposition, ignition and combustion, and delayed combustion. The mechanism of the combustion reaction is carried out according to free radical reaction mechanism, one of which is crucial to the process of thermal decomposition, polyethylene in the process decomposition of small hydrocarbon molecules, these small hydrocarbon molecules can produce very high activity in heat and oxygen under the action of H, HO, and O???, in which don't get energy from the outside of the situation can be combined with the outer part, and the formation of new radicals, thereby maintaining the sustained combustion.
There are two kinds of PE Flame Retardants: reactive type and additive type. Reactive flame retardants are mainly synthesized by monomers with flame retardant elements, which make the main chain or side chain with flame retardant elements, and play a role of flame retardant. Additive flame retardant is a kind of flame retardant which is blended with polymer material in physical dispersion state and plays a role of flame retardant.
The reaction of polyethylene resin flame retardant type because of the connection in the polymer by chemical bonds through the polymerization of the structural unit with flame retardant function, so the flame retardant effect lasting, and affect the physical and mechanical properties of polyethylene is small, but because of the price and technology problems, the popularization and application is limited. Compared with reactive flame retardant polyethylene resin, flame retardant additive has the advantages of convenient use, the price is relatively low, so is the method commonly used flame retardant polyethylene.
Halogen based flame retardants are the most frequently used flame retardants, and have undergone a golden age of development in the 70~80 century in twentieth Century. Although its consumption is decreasing gradually, its yield and consumption are still the most popular flame retardant varieties in the world. There are two main categories of halogenated flame retardants: chlorine series and bromine series. CFRs commonly used varieties of chlorinated paraffin, chlorinated polyethylene, four chloro phthalic anhydride, four chloro two bisphenol A, hexachlorocyclopentadiene and its derivatives.
Brominated flame retardant compounds from the structure can be divided into two types of brominated diphenyl ether, bisphenol A, four bromine brominated polyols, bromo phthalate two formic acid anhydrides, and other new types of brominated flame retardants. The flame retardant effect of chlorine based flame retardant is less than that of brominated flame retardant, which is related to the C2Cl bond energy is larger than the C2Br bond energy, and it is not easy to produce chlorine free radical.
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.
The polyethylene material for halogen flame retardant treated with flame retardant properties although very high, but there are also many problems, mainly in: (1) combustion will emit large amounts of toxic gases (HCl, HBr); (2) to produce a large number of corrosive substances; (3) easy to cause environmental pollution. Brominated flame retardants, for example, have the advantages of high flame retardancy, good thermal stability and low amount of additives. They are the most important and effective flame retardants in halogenated flame retardants.
However, since the emergence of Dioxin in 1986, brominated flame retardants are facing great environmental pressure. The debate about halogenated flame retardants has not stopped. Although the current evidence is not enough to cancel the flame retardant so effectively, but the world's major manufacturers in the development of flame retardant can replace the brominated flame retardant controversial in certain areas.
In short, halogen flame retardant has many advantages, but because of the large amount of smoke during combustion, produce large amounts of toxic and corrosive gases, not only easy to cause two pollution, but also to escape and fire fighting difficult. Therefore, the dosage has a decreasing trend.
Hydrated hydroxides are currently used mainly for two kinds of Mg (OH) 2 and Al (OH) 3. Hydrous hydroxide because it does not have two pollution, good thermal stability, with other flame retardant synergistic effect, non-toxic, non corrosive, non volatile, does not produce toxic gases, low price and wide source, known as pollution-free flame retardant, flame retardant is in flame retardant and smoke suppression, filling three function as one of the.
However, Al (OH) 3 and Mg (OH) 2 flame retardant ability is not strong, in polyethylene to general flame retardant effect requires a high amount of filling amount, general to reach 60 copies when it can play the role of flame retardant. Such a large amount will make the mechanical properties of the material becomes worse, so the hydrated hydroxide on flame retardant polyethylene modified before the general need to be flame retardant and resin matrix technology.
In order to increase the Hippi Al (OH) 3 and Mg (OH) 2 with polyethylene resin compatibility, preparation of PE2CO2OH and PE2CO2COOH two compatibility with metal dicyclopentadiene compounds as catalyst, and by transmission electron microscope and cone calorimeter of PE II PE2CO2OH II Al (OH) 3 and PE - PE2CO2COOH PI Mg (OH) microstructure and flame retardant properties of 2 were tested, the experimental results show that Al (OH) 3 and Mg (OH) 2 in the matrix resin dispersed more evenly, and the ignition time from the original 73s to 85s.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Polyethylene resin has many advantages: lightweight, non-toxic, anti impact performance, and low price, easy processing, each department has been widely used in the national production. However, due to its flammability (oxygen index is only 1714), and combustion with melting drop phenomenon, it is necessary to improve its flame retardant properties can be safely used.
From heating to combustion, polyethylene undergoes several processes such as melting depolymerization, decomposition, ignition and combustion, and delayed combustion. The mechanism of the combustion reaction is carried out according to free radical reaction mechanism, one of which is crucial to the process of thermal decomposition, polyethylene in the process decomposition of small hydrocarbon molecules, these small hydrocarbon molecules can produce very high activity in heat and oxygen under the action of H, HO, and O???, in which don't get energy from the outside of the situation can be combined with the outer part, and the formation of new radicals, thereby maintaining the sustained combustion.
There are two kinds of PE Flame Retardants: reactive type and additive type. Reactive flame retardants are mainly synthesized by monomers with flame retardant elements, which make the main chain or side chain with flame retardant elements, and play a role of flame retardant. Additive flame retardant is a kind of flame retardant which is blended with polymer material in physical dispersion state and plays a role of flame retardant.
The reaction of polyethylene resin flame retardant type because of the connection in the polymer by chemical bonds through the polymerization of the structural unit with flame retardant function, so the flame retardant effect lasting, and affect the physical and mechanical properties of polyethylene is small, but because of the price and technology problems, the popularization and application is limited. Compared with reactive flame retardant polyethylene resin, flame retardant additive has the advantages of convenient use, the price is relatively low, so is the method commonly used flame retardant polyethylene.
Halogen based flame retardants are the most frequently used flame retardants, and have undergone a golden age of development in the 70~80 century in twentieth Century. Although its consumption is decreasing gradually, its yield and consumption are still the most popular flame retardant varieties in the world. There are two main categories of halogenated flame retardants: chlorine series and bromine series. CFRs commonly used varieties of chlorinated paraffin, chlorinated polyethylene, four chloro phthalic anhydride, four chloro two bisphenol A, hexachlorocyclopentadiene and its derivatives.
Brominated flame retardant compounds from the structure can be divided into two types of brominated diphenyl ether, bisphenol A, four bromine brominated polyols, bromo phthalate two formic acid anhydrides, and other new types of brominated flame retardants. The flame retardant effect of chlorine based flame retardant is less than that of brominated flame retardant, which is related to the C2Cl bond energy is larger than the C2Br bond energy, and it is not easy to produce chlorine free radical.
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.
The polyethylene material for halogen flame retardant treated with flame retardant properties although very high, but there are also many problems, mainly in: (1) combustion will emit large amounts of toxic gases (HCl, HBr); (2) to produce a large number of corrosive substances; (3) easy to cause environmental pollution. Brominated flame retardants, for example, have the advantages of high flame retardancy, good thermal stability and low amount of additives. They are the most important and effective flame retardants in halogenated flame retardants.
However, since the emergence of Dioxin in 1986, brominated flame retardants are facing great environmental pressure. The debate about halogenated flame retardants has not stopped. Although the current evidence is not enough to cancel the flame retardant so effectively, but the world's major manufacturers in the development of flame retardant can replace the brominated flame retardant controversial in certain areas.
In short, halogen flame retardant has many advantages, but because of the large amount of smoke during combustion, produce large amounts of toxic and corrosive gases, not only easy to cause two pollution, but also to escape and fire fighting difficult. Therefore, the dosage has a decreasing trend.
Hydrated hydroxides are currently used mainly for two kinds of Mg (OH) 2 and Al (OH) 3. Hydrous hydroxide because it does not have two pollution, good thermal stability, with other flame retardant synergistic effect, non-toxic, non corrosive, non volatile, does not produce toxic gases, low price and wide source, known as pollution-free flame retardant, flame retardant is in flame retardant and smoke suppression, filling three function as one of the.
However, Al (OH) 3 and Mg (OH) 2 flame retardant ability is not strong, in polyethylene to general flame retardant effect requires a high amount of filling amount, general to reach 60 copies when it can play the role of flame retardant. Such a large amount will make the mechanical properties of the material becomes worse, so the hydrated hydroxide on flame retardant polyethylene modified before the general need to be flame retardant and resin matrix technology.
In order to increase the Hippi Al (OH) 3 and Mg (OH) 2 with polyethylene resin compatibility, preparation of PE2CO2OH and PE2CO2COOH two compatibility with metal dicyclopentadiene compounds as catalyst, and by transmission electron microscope and cone calorimeter of PE II PE2CO2OH II Al (OH) 3 and PE - PE2CO2COOH PI Mg (OH) microstructure and flame retardant properties of 2 were tested, the experimental results show that Al (OH) 3 and Mg (OH) 2 in the matrix resin dispersed more evenly, and the ignition time from the original 73s to 85s.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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