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Organosilicon flame retardants for polyolefin
2017-12-6 10:42:24
Organosilicon flame retardants for polyolefin
Polyolefin (polyolefin) silicone flame retardant polysiloxane is a polymer containing the Si-O-Si, Si-O-B and B-O-B bonds on the main chain of the molecule. The synergistic flame retardancy of B and Si on the same molecular chain is achieved by forming a copolymer of boron in the form of chemical bonds with siloxane.
Polyolefin with organosilicon flame retardant is a new type of high efficiency, low toxicity, anti melt, environmentally friendly halogen - free flame retardant, but also a carbon - forming smoke suppressant. Polyolefin with organosilicon flame retardants can improve the processing performance and heat resistance of the base material in addition to the excellent flame retardancy given to the base material.
The research on silicone flame retardants is mainly aimed at improving flame retardancy and smoke suppression, improving carbon generation and processing and mechanical properties of matrix materials by improving molecular structure, improving relative molecular mass and blending. High silicon containing thermal stability, oxidation stability, hydrophobicity and good flexibility, the use of polymerization, grafting and crosslinking technology of silicon containing polymer into the molecular chain, the silicon containing flame retardant polymers has the characteristics of the flame retardant, heat resistance, anti-oxidation, not easy combustion, also has high resistance to humidity and the molecular flexibility and processing performance can be improved.
The day before, silicone flame retardants are silicone flame retardant and polyborosiloxane flame retardant. The way of flame-retardant can be directly adding silicone flame retardants to polymer materials, or by embedding some chains containing functional groups (such as terminal hydroxyl, amino or epoxy groups) into some polymers.
Organosilicon flame retardant is based on the mechanism of flame retardancy in condensed phase, that is to achieve its flame retardancy by generating cracking carbon layer and improving the oxidation resistance of carbon layer. After adding silicone flame retardants in polymer materials, silicone flame retardants will migrate to the surface of materials and form polymer gradient materials with silicone surface as flame retardant.
Once burning, polysiloxane - specific, inorganic oxygen insulating protective layers with Si and / or Si-C bonds are produced. This not only prevents the escape of the combustion decomposition products, but also inhibits the thermal decomposition of the polymer materials, and achieves the purpose of flame retardancy, low smoke and low toxicity.
A polyolefin flame retardant for polyolefin polysiloxane used for polyolefin in PC was prepared by Zhou Wenjun. Because B and Si solve the problem of complex and difficult dispersion of boron compounds and polysiloxane in the form of physical mixing into PC. Adding the flame retardant with mass fraction of 3%-5% to PC can make the flame retardant grade of the material reach UL94 V-0 level, and the flame retardant PC has good mechanical property, high diaphaneity, washing resistance, no corrosion, and no harm to environment and human body.
Triphenyl Phosphate (TPP)
Retardants tpp quality standards:
Appearance: white flaky crystal
Content : ≥ 99%;
Acid value (mgKOH / g): ≤ 0.1;
Free phenol : ≤ 0.1%;
Freezing point : ≥ 47.0 ℃
Chromaticity (APHA): ≤ 60;
Moisture : ≤ 0.1%
Density (50 ℃, g/cm3) :1.185-1 .202
Retardants tpp Packing: NW 25KG / composite paper ( lined with black plastic bags ) , a small cabinet loaded 12.5 tons .
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.
A polyolefin polyolefin flame retardant polyolefin polyolefin, such as polyolefin, is synthesized by Zhao Jianqing. In order to ensure its thermal stability to meet the processing technology of various polymer materials, the molar fraction of the phenyl group is more than 90% in its molecular structure. In order to improve the compatibility of flame retardants and polyolefin materials and reduce the adverse effects of poor compatibility on the mechanical properties of materials, the vinyl and long carbon chain groups were introduced into the molecular structure.
The addition of the flame retardant with a mass fraction of 8% to polyethylene can increase the oxygen index of the flame retardant material from 17% to 30%, and the heat release rate of the material is also significantly reduced.
Silicon resin flame retardant, silicon resin is a crosslinked semi inorganic polymer that uses Si-O-Si as the main chain and the organic base is connected to the silicon atom. The side group of the silicon resin molecule is called pure silicon resin when it is hydrogen bond or organic group. Silicone resin has excellent heat resistance, weatherability, flame retardancy and electrical insulation.
A silicone resin flame retardant was prepared by hydrolysis condensation method by Zhou Wenjun and other phenyl methoxy silane and methyl methoxy silane as raw materials. The best process conditions are reaction time 2h, reaction temperature 80 C, catalyst dosage 5g, sealing time 45min. Then the polycarbonate was added to the silicon resin with a mass fraction of 5%, which could increase the combustion oxygen index from 26% to 34%.
Li Xiaojun and et al also used methyl phenyl silicone resin to modify the flame retardance of polycarbonate. When the mass fraction of phenyl methyl silicone resin was 6%, the oxygen index of the material increased from 28% to 40.6%, and the flame retardant grade increased from U L94 V-2 to V-0 grade.
The flame retardancy of flame retardant polyborosiloxane (BSi) on polycarbonate / acrylonitrile butadiene styrene copolymer (PC/ABS) alloy was studied by means of limited oxygen index and cone calorimetry, by Song Jian et al., Hangzhou Normal University. The results show that the addition of 5% (mass fraction) of BSi can make the limited oxygen index of PC/ABS alloy increased from 24% to 28.6%; the addition of BSi can make the fire performance index increased 63%, and can reduce the combustion process produces smoke, heat and CO, CO2 and other harmful gases, promoting the formation of carbon, protect the substrate materials, ease of combustion process, reduce fire hazards.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Polyolefin (polyolefin) silicone flame retardant polysiloxane is a polymer containing the Si-O-Si, Si-O-B and B-O-B bonds on the main chain of the molecule. The synergistic flame retardancy of B and Si on the same molecular chain is achieved by forming a copolymer of boron in the form of chemical bonds with siloxane.
Polyolefin with organosilicon flame retardant is a new type of high efficiency, low toxicity, anti melt, environmentally friendly halogen - free flame retardant, but also a carbon - forming smoke suppressant. Polyolefin with organosilicon flame retardants can improve the processing performance and heat resistance of the base material in addition to the excellent flame retardancy given to the base material.
The research on silicone flame retardants is mainly aimed at improving flame retardancy and smoke suppression, improving carbon generation and processing and mechanical properties of matrix materials by improving molecular structure, improving relative molecular mass and blending. High silicon containing thermal stability, oxidation stability, hydrophobicity and good flexibility, the use of polymerization, grafting and crosslinking technology of silicon containing polymer into the molecular chain, the silicon containing flame retardant polymers has the characteristics of the flame retardant, heat resistance, anti-oxidation, not easy combustion, also has high resistance to humidity and the molecular flexibility and processing performance can be improved.
The day before, silicone flame retardants are silicone flame retardant and polyborosiloxane flame retardant. The way of flame-retardant can be directly adding silicone flame retardants to polymer materials, or by embedding some chains containing functional groups (such as terminal hydroxyl, amino or epoxy groups) into some polymers.
Organosilicon flame retardant is based on the mechanism of flame retardancy in condensed phase, that is to achieve its flame retardancy by generating cracking carbon layer and improving the oxidation resistance of carbon layer. After adding silicone flame retardants in polymer materials, silicone flame retardants will migrate to the surface of materials and form polymer gradient materials with silicone surface as flame retardant.
Once burning, polysiloxane - specific, inorganic oxygen insulating protective layers with Si and / or Si-C bonds are produced. This not only prevents the escape of the combustion decomposition products, but also inhibits the thermal decomposition of the polymer materials, and achieves the purpose of flame retardancy, low smoke and low toxicity.
A polyolefin flame retardant for polyolefin polysiloxane used for polyolefin in PC was prepared by Zhou Wenjun. Because B and Si solve the problem of complex and difficult dispersion of boron compounds and polysiloxane in the form of physical mixing into PC. Adding the flame retardant with mass fraction of 3%-5% to PC can make the flame retardant grade of the material reach UL94 V-0 level, and the flame retardant PC has good mechanical property, high diaphaneity, washing resistance, no corrosion, and no harm to environment and human body.
Triphenyl Phosphate (TPP)
Retardants tpp quality standards:
Appearance: white flaky crystal
Content : ≥ 99%;
Acid value (mgKOH / g): ≤ 0.1;
Free phenol : ≤ 0.1%;
Freezing point : ≥ 47.0 ℃
Chromaticity (APHA): ≤ 60;
Moisture : ≤ 0.1%
Density (50 ℃, g/cm3) :1.185-1 .202
Retardants tpp Packing: NW 25KG / composite paper ( lined with black plastic bags ) , a small cabinet loaded 12.5 tons .
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.
A polyolefin polyolefin flame retardant polyolefin polyolefin, such as polyolefin, is synthesized by Zhao Jianqing. In order to ensure its thermal stability to meet the processing technology of various polymer materials, the molar fraction of the phenyl group is more than 90% in its molecular structure. In order to improve the compatibility of flame retardants and polyolefin materials and reduce the adverse effects of poor compatibility on the mechanical properties of materials, the vinyl and long carbon chain groups were introduced into the molecular structure.
The addition of the flame retardant with a mass fraction of 8% to polyethylene can increase the oxygen index of the flame retardant material from 17% to 30%, and the heat release rate of the material is also significantly reduced.
Silicon resin flame retardant, silicon resin is a crosslinked semi inorganic polymer that uses Si-O-Si as the main chain and the organic base is connected to the silicon atom. The side group of the silicon resin molecule is called pure silicon resin when it is hydrogen bond or organic group. Silicone resin has excellent heat resistance, weatherability, flame retardancy and electrical insulation.
A silicone resin flame retardant was prepared by hydrolysis condensation method by Zhou Wenjun and other phenyl methoxy silane and methyl methoxy silane as raw materials. The best process conditions are reaction time 2h, reaction temperature 80 C, catalyst dosage 5g, sealing time 45min. Then the polycarbonate was added to the silicon resin with a mass fraction of 5%, which could increase the combustion oxygen index from 26% to 34%.
Li Xiaojun and et al also used methyl phenyl silicone resin to modify the flame retardance of polycarbonate. When the mass fraction of phenyl methyl silicone resin was 6%, the oxygen index of the material increased from 28% to 40.6%, and the flame retardant grade increased from U L94 V-2 to V-0 grade.
The flame retardancy of flame retardant polyborosiloxane (BSi) on polycarbonate / acrylonitrile butadiene styrene copolymer (PC/ABS) alloy was studied by means of limited oxygen index and cone calorimetry, by Song Jian et al., Hangzhou Normal University. The results show that the addition of 5% (mass fraction) of BSi can make the limited oxygen index of PC/ABS alloy increased from 24% to 28.6%; the addition of BSi can make the fire performance index increased 63%, and can reduce the combustion process produces smoke, heat and CO, CO2 and other harmful gases, promoting the formation of carbon, protect the substrate materials, ease of combustion process, reduce fire hazards.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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