News Details
Polycarbonate flame retardant
2017-11-10 15:34:52
Polycarbonate flame retardant
Polycarbonate itself has a certain flame retardancy, according to molecular weight and different grafting conditions, the oxygen index of 21%--24%, flame retardant properties as UL-94 V-2, is better than ordinary plastic, polycarbonate can self extinguishing, but still difficult to meet the requirements of flame retardant polycarbonate in some applications such as TV, computer, printer and chassis components, transformers coil, automobile parts, building materials etc.. In addition, the hot melt dripping from polycarbonate can easily cause the ignition of nearby materials. Therefore, flame retardant modification of polycarbonate must be carried out. Polycarbonate flame retardant is one of the most commonly used additives in polycarbonate.
At present, the flame retardants commonly used in polycarbonate are mainly brominated, organic phosphorus, silicon, sulfonate, boron and so on. Brominated flame retardants are gradually restricted due to their environmental pollution. Flame retardant addition: generally in-10%, most decomposition temperature is relatively low, easy corrosion molds, some will also affect the impact strength of the resin, even cause yellowing of polycarbonate material in high temperature, organic phosphorus flame retardant is generally used for the polycarbonate / ABS alloy.
Organosilicon compounds are considered as an efficient, non-toxic, low smoke and environmentally friendly flame retardant. But it has high cost and is often used in combination with other flame retardants. The flame retardant efficiency of boron based flame retardant is not high, and it is usually only used with polysiloxane to achieve better effect.
Polycarbonate flame retardant has high flame retardant efficiency, adding a small amount of polycarbonate can reach UL 94 V-0 (3.2mm thick), but to meet the higher flame retardant performance, it needs to be mixed with other flame retardants.
At present, polycarbonate flame retardants commonly used in industry are mainly phosphoric acid three phenyl ester, benzene sulfonic acid potassium sulfonate (KSS), total butyl potassium sulfonate (PPFBS), 2, 4, 5 - three sodium benzene sulfonate (STB). Flame retardant mechanism - flame retardant can be divided into: 1, gas phase flame retardant, which plays a role in inhibiting the chain growth of free radicals in the combustion reaction; 2, condensed phase flame retardant, decomposition and release of flammable gases prevent polymer terminated polymers in the solid phase of the heat; 3, heat exchange is interrupted, the polymer produced the heat away without feedback to the polymer, the polymer is no longer continuous decomposition. However, the flame retardant mechanism of sulfonate on polycarbonate is different from that mentioned above. At present, it is believed that it can accelerate the char formation rate of polycarbonate and promote the crosslinking of polymers.
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.
Polycarbonate and polycarbonate (TGA) /PPFBS thermal spectrum visible at 455 DEG -531 DEG between the emergence of a peak at 503 C mass loss rate (MLR) of about 20% / min, pure polycarbonate TGA spectra showed that the temperature of about 9% MLR / min, the former is about two times of the latter. In addition, adding polycarbonate after PPFBS and pure polycarbonate after the combustion of carbon residue does not change much (the residual amount of 500 DEG C for 40.1% polycarbonate, polycarbonate / PPFBS is 43.6%, the residual amount of carbon 700 C both are 21.5%), but after the addition of PPFBS oxygen index increases from 26.8% to 37.5% polycarbonate.
In addition to the polycarbonate / PPFBS system to 460.8 DEG C and 515.8 C FTIR spectra and FTIR spectra of pure polycarbonate and comparison, the conclusion is: PPFBS flame retardant polycarbonate function is: 1, to promote the release of carbon dioxide and water; 2, promote the formation of phenolic substances; 3, to promote the aromatic and aliphatic compounds which shows that PPFBS has improved the rate of carbon into the role of polycarbonate.
Study on crosslinking of polycarbonate. Brady using pyrolysis chromatography mass spectrometry, it is found that sulfonate can promote the formation of two (crosslinking) of propofol, which is an alkaline reaction. According to this mechanism, that potassium alkaline alkyl polycarbonate / PPFBS system produced by thermal degradation is conducive to maintaining the cross-linking degree of polycarbonate.
Based on the structure of polycarbonate, the crosslinking process of polycarbonate in the presence of sulfonate was investigated by Jameshines et al.
Different from ordinary polyesters (such as PET, PBT), the structure of polycarbonate makes it have a specific degradation process, that is, the rearrangement of molecular structure occurs after heating, which makes the crosslinking of polycarbonate. In addition, the sulfur dioxide generated by the decomposition of sulfonate can promote the rearrangement and promote the crosslinking of polycarbonate. Carbon on the surface of the material. Preventing the release of flammable gases and the propagation of heat. The release of heat from the small amount of crosslinking of polycarbonate is sufficient to make the material flame retardant up to UL-94V-0 grade. In addition, crosslinking can also effectively inhibit the formation of droplets.
The common sulfonate flame retardants in polycarbonate are KSS, PPFBS and STB. STB is commonly used in flame retardant opaque polycarbonate material, and its flame retardant effect is good. The addition of 0.1% STB in polycarbonate leads to an oxygen index of 25%~35% and a flame retardant grade of UL - 94 V-0. SIB can also be used in conjunction with other flame retardants. When used alone, the content of halogen elements in the whole system is less than 0.15%, and in some regulations it is classified into halogen free materials.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Polycarbonate itself has a certain flame retardancy, according to molecular weight and different grafting conditions, the oxygen index of 21%--24%, flame retardant properties as UL-94 V-2, is better than ordinary plastic, polycarbonate can self extinguishing, but still difficult to meet the requirements of flame retardant polycarbonate in some applications such as TV, computer, printer and chassis components, transformers coil, automobile parts, building materials etc.. In addition, the hot melt dripping from polycarbonate can easily cause the ignition of nearby materials. Therefore, flame retardant modification of polycarbonate must be carried out. Polycarbonate flame retardant is one of the most commonly used additives in polycarbonate.
At present, the flame retardants commonly used in polycarbonate are mainly brominated, organic phosphorus, silicon, sulfonate, boron and so on. Brominated flame retardants are gradually restricted due to their environmental pollution. Flame retardant addition: generally in-10%, most decomposition temperature is relatively low, easy corrosion molds, some will also affect the impact strength of the resin, even cause yellowing of polycarbonate material in high temperature, organic phosphorus flame retardant is generally used for the polycarbonate / ABS alloy.
Organosilicon compounds are considered as an efficient, non-toxic, low smoke and environmentally friendly flame retardant. But it has high cost and is often used in combination with other flame retardants. The flame retardant efficiency of boron based flame retardant is not high, and it is usually only used with polysiloxane to achieve better effect.
Polycarbonate flame retardant has high flame retardant efficiency, adding a small amount of polycarbonate can reach UL 94 V-0 (3.2mm thick), but to meet the higher flame retardant performance, it needs to be mixed with other flame retardants.
At present, polycarbonate flame retardants commonly used in industry are mainly phosphoric acid three phenyl ester, benzene sulfonic acid potassium sulfonate (KSS), total butyl potassium sulfonate (PPFBS), 2, 4, 5 - three sodium benzene sulfonate (STB). Flame retardant mechanism - flame retardant can be divided into: 1, gas phase flame retardant, which plays a role in inhibiting the chain growth of free radicals in the combustion reaction; 2, condensed phase flame retardant, decomposition and release of flammable gases prevent polymer terminated polymers in the solid phase of the heat; 3, heat exchange is interrupted, the polymer produced the heat away without feedback to the polymer, the polymer is no longer continuous decomposition. However, the flame retardant mechanism of sulfonate on polycarbonate is different from that mentioned above. At present, it is believed that it can accelerate the char formation rate of polycarbonate and promote the crosslinking of polymers.
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.
Polycarbonate and polycarbonate (TGA) /PPFBS thermal spectrum visible at 455 DEG -531 DEG between the emergence of a peak at 503 C mass loss rate (MLR) of about 20% / min, pure polycarbonate TGA spectra showed that the temperature of about 9% MLR / min, the former is about two times of the latter. In addition, adding polycarbonate after PPFBS and pure polycarbonate after the combustion of carbon residue does not change much (the residual amount of 500 DEG C for 40.1% polycarbonate, polycarbonate / PPFBS is 43.6%, the residual amount of carbon 700 C both are 21.5%), but after the addition of PPFBS oxygen index increases from 26.8% to 37.5% polycarbonate.
In addition to the polycarbonate / PPFBS system to 460.8 DEG C and 515.8 C FTIR spectra and FTIR spectra of pure polycarbonate and comparison, the conclusion is: PPFBS flame retardant polycarbonate function is: 1, to promote the release of carbon dioxide and water; 2, promote the formation of phenolic substances; 3, to promote the aromatic and aliphatic compounds which shows that PPFBS has improved the rate of carbon into the role of polycarbonate.
Study on crosslinking of polycarbonate. Brady using pyrolysis chromatography mass spectrometry, it is found that sulfonate can promote the formation of two (crosslinking) of propofol, which is an alkaline reaction. According to this mechanism, that potassium alkaline alkyl polycarbonate / PPFBS system produced by thermal degradation is conducive to maintaining the cross-linking degree of polycarbonate.
Based on the structure of polycarbonate, the crosslinking process of polycarbonate in the presence of sulfonate was investigated by Jameshines et al.
Different from ordinary polyesters (such as PET, PBT), the structure of polycarbonate makes it have a specific degradation process, that is, the rearrangement of molecular structure occurs after heating, which makes the crosslinking of polycarbonate. In addition, the sulfur dioxide generated by the decomposition of sulfonate can promote the rearrangement and promote the crosslinking of polycarbonate. Carbon on the surface of the material. Preventing the release of flammable gases and the propagation of heat. The release of heat from the small amount of crosslinking of polycarbonate is sufficient to make the material flame retardant up to UL-94V-0 grade. In addition, crosslinking can also effectively inhibit the formation of droplets.
The common sulfonate flame retardants in polycarbonate are KSS, PPFBS and STB. STB is commonly used in flame retardant opaque polycarbonate material, and its flame retardant effect is good. The addition of 0.1% STB in polycarbonate leads to an oxygen index of 25%~35% and a flame retardant grade of UL - 94 V-0. SIB can also be used in conjunction with other flame retardants. When used alone, the content of halogen elements in the whole system is less than 0.15%, and in some regulations it is classified into halogen free materials.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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