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Flame retardant for PVC
2017-11-9 12:38:33
Flame retardant for PVC
Polyvinyl chloride (PVC) is a kind of polymer material that uses a chlorine atom to replace one hydrogen atom in polyethylene. It is an amorphous polymer containing a small amount of crystalline structure. The structure of this material is as follows: [- CH2 - CHCl -]n. PVC is a linear polymer of most VCM monomers linked to the head tail structure. The carbon atoms are zigzag, and all atoms are connected by a sigma bond. All carbon atoms are SP3 hybrid.
There are short syndiotactic structures on the PVC molecular chain. With the decrease of polymerization temperature, the degree of syndiotactic modification increased. There are some unstable structures such as head structure, branched chain, double bond, allyl chloride and tertiary chloride in PVC macromolecular structure, which make the heat resistance deformation and aging resistance worse. After crosslinking, the defects can be eliminated.
With the increasing application of PVC, the performance requirements of PVC are higher and higher. PVC with flame retardant (flame retardant is 40 or above), chemical resistance (resistance to high concentrated hydrochloric acid, sulfuric acid concentration of 90%, concentration of nitric acid and sodium hydroxide concentration of 20% 60%), has the advantages of good mechanical strength and electrical insulation.
Polyvinyl chloride is the most characteristic flame retardant properties, so it is widely used in fire protection applications. But polyvinyl chloride releases hydrogen chloride and other toxic gases, such as dioxin, during combustion. Therefore, it is necessary for PVC to be flame retardant modified by flame retardants.
The thermal stability of PVC is poor, and it is easy to decompose when heated. The decomposed products will accelerate the decomposition of PVC.
The requirements of flame retardants for PVC are more stringent in the process of PVC molding. A small amount of PVC is decomposed with flame retardant, which causes a large amount of decomposition of PVC. In addition, PVC is a high crystalline polymer with poor compatibility with other additives. With the increase of the amount of additives, the physical and mechanical properties of PVC are greatly reduced. Therefore, it is very difficult to prepare PVC with good flame retardancy.
The developed countries in the world began to research and develop PVC flame retardants and flame retardant PVC since 1960s, and they were the most active in the 70~80's..
Because the flame retardant system suitable for PVC is less, and the addition method of flame retardant is relatively simple, a large number of flame retardants will significantly reduce the mechanical properties of pvc. Therefore, it is difficult to prepare flame retardant PVC with excellent properties. In this paper, different flame retardant systems and different addition methods of flame retardants are briefly introduced.
Tris(2-chloroisopropyl)Phosphate(TCPP)
Cas No:13674 -84-5
HS Code HS: 29199000
The most important indicator of product:
colorless transparent liquid, moisture ≤ 0.1, Acid value ≤ 0.1, Chroma ≤ 50, the phosphorus content: 9.4 ± 0.5
Raw materials: phosphorus oxychloride and epichlorohydrin.
Belong to several categories of dangerous goods:
Currently Tris(2-chloroisopropyl)Phosphate TCPP general cargo exports are not dangerous.
The product is used for the soft / hard polyurethane foam, with thermal and hydrolytic stability good, especially suitable for ASTME84 (Level 11) foam, with low viscosity unsaturated polyester resin in low temperature application and phenolic plastics at. This product is also used to grab the foam sealant and sheet production. For polyvinyl chloride, polystyrene, phenolic resin, acrylic resin and rubber, coating, flame retardant, also used for soft and hard polyurethane foam, epoxy resin, polystyrene, cellulose acetate, ethyl cellulose tree and phenolic plastics, polyvinyl acetate and gun type foam sealant production. Particularly recommended for rigid polyurethane foam has excellent thermal and hydrolytic stability is particularly suitable for ASTM84 (II), compound for polyurethane foam and unsaturated resin and phenolic plastics.
The inorganic flame retardant has good thermal stability, low toxic or non-toxic, no corrosive gas, no volatilization, no precipitation during storage, has the advantages of durable flame retardant effect, and a rich source of raw materials, low price. Especially, the inorganic flame retardants are becoming more and more important when the requirements of environmental safety and safety of flame retardant products are becoming stricter. At present, commercial inorganic flame retardants mainly include aluminum hydroxide, magnesium hydroxide, three antimony oxide, two zinc polyphosphate, etc.. Liu Pengbo et al. Chose Mg (OH) 2 as the flame retardant of PVC, and studied its influence on the flame retardant effect and mechanical properties of pvc.
With the addition of Mg (OH) 2 flame retardant, the flame retardancy of PVC was greatly improved. When the amount of Mg (OH) 2 was 60%, the oxygen index increased from 15% to 40%, and the horizontal combustion rate decreased from 0.33mm/s to 0.31mm/s. However, the compatibility between PVC and inorganic flame retardant Mg (OH) 2 is poor, and the mechanical properties of PVC decrease with the addition of flame retardant.
Feng Dingsong joined Al in total of polyvinyl chloride (OH) or 3 Mg (OH) 2. The results show that the filled 40%Al (OH) 3 or Mg (OH) 2 of the burning rate is reduced to half of total pure PVC, when Al (OH) 3 amount accounted for a total of 60% PVC quality, product completely nonflammable; and Al (OH) Mg (OH) 3 compared to 2 of the poor flame retardant effect. When the Al (OH) 3 was pretreated with aluminum coupling agent and then blended with PVC, the mechanical properties were improved obviously, and the flame retardancy was not affected. Adding zinc stearate can obviously improve its fluidity. The strength and fluidity of the blend can be obviously increased by the combination of the two. The flame retardancy of Al (OH) 3 flame retardant polyvinyl chloride prepared by 36% PVC, 60% Al (OH) 3 and 4% aluminate coupling agent is 2S without flame, tensile strength is 18.2MPa, notch impact strength is 4.0kJ/m2.
Zhao Xiaoping screening 3,5 hydrated zinc borate from boron flame retardant; molybdenum flame retardant in screening of PVC flame retardant Ammonium Molybdate Modified by 150g, PVC, 1g antioxidant 3114, 1g melamine, 0.5g lubricant EBS, adding 20g zinc borate flame retardant PVC when the oxygen index reached 18%, but there is a strong formaldehyde molding smell. This phenomenon shows that the boron flame retardant zinc borate can lead to degradation of PVC, not suitable as a main flame retardant PVC; when adding ammonium molybdate 20g flame retardant PVC oxygen index can reach 18.5%, and the processing of non formaldehyde odor, the sample density. The molybdenum series flame retardants do not cause the decomposition of PVC, and the flame retardant effect is better.
The self extinguishing formula was obtained by adding Mn, Ba, Sr, Ca or Mg borate into polyvinyl chloride. Flame retardant polyvinyl chloride with molybdenum compounds such as MoO3, MoS2, (NH4) Mo2O7, CaMoO4 and phosphorus or phosphorus compounds.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
There are short syndiotactic structures on the PVC molecular chain. With the decrease of polymerization temperature, the degree of syndiotactic modification increased. There are some unstable structures such as head structure, branched chain, double bond, allyl chloride and tertiary chloride in PVC macromolecular structure, which make the heat resistance deformation and aging resistance worse. After crosslinking, the defects can be eliminated.
With the increasing application of PVC, the performance requirements of PVC are higher and higher. PVC with flame retardant (flame retardant is 40 or above), chemical resistance (resistance to high concentrated hydrochloric acid, sulfuric acid concentration of 90%, concentration of nitric acid and sodium hydroxide concentration of 20% 60%), has the advantages of good mechanical strength and electrical insulation.
Polyvinyl chloride is the most characteristic flame retardant properties, so it is widely used in fire protection applications. But polyvinyl chloride releases hydrogen chloride and other toxic gases, such as dioxin, during combustion. Therefore, it is necessary for PVC to be flame retardant modified by flame retardants.
The thermal stability of PVC is poor, and it is easy to decompose when heated. The decomposed products will accelerate the decomposition of PVC.
The requirements of flame retardants for PVC are more stringent in the process of PVC molding. A small amount of PVC is decomposed with flame retardant, which causes a large amount of decomposition of PVC. In addition, PVC is a high crystalline polymer with poor compatibility with other additives. With the increase of the amount of additives, the physical and mechanical properties of PVC are greatly reduced. Therefore, it is very difficult to prepare PVC with good flame retardancy.
The developed countries in the world began to research and develop PVC flame retardants and flame retardant PVC since 1960s, and they were the most active in the 70~80's..
Because the flame retardant system suitable for PVC is less, and the addition method of flame retardant is relatively simple, a large number of flame retardants will significantly reduce the mechanical properties of pvc. Therefore, it is difficult to prepare flame retardant PVC with excellent properties. In this paper, different flame retardant systems and different addition methods of flame retardants are briefly introduced.
Tris(2-chloroisopropyl)Phosphate(TCPP)
Cas No:13674 -84-5
HS Code HS: 29199000
The most important indicator of product:
colorless transparent liquid, moisture ≤ 0.1, Acid value ≤ 0.1, Chroma ≤ 50, the phosphorus content: 9.4 ± 0.5
Raw materials: phosphorus oxychloride and epichlorohydrin.
Belong to several categories of dangerous goods:
Currently Tris(2-chloroisopropyl)Phosphate TCPP general cargo exports are not dangerous.
The product is used for the soft / hard polyurethane foam, with thermal and hydrolytic stability good, especially suitable for ASTME84 (Level 11) foam, with low viscosity unsaturated polyester resin in low temperature application and phenolic plastics at. This product is also used to grab the foam sealant and sheet production. For polyvinyl chloride, polystyrene, phenolic resin, acrylic resin and rubber, coating, flame retardant, also used for soft and hard polyurethane foam, epoxy resin, polystyrene, cellulose acetate, ethyl cellulose tree and phenolic plastics, polyvinyl acetate and gun type foam sealant production. Particularly recommended for rigid polyurethane foam has excellent thermal and hydrolytic stability is particularly suitable for ASTM84 (II), compound for polyurethane foam and unsaturated resin and phenolic plastics.
The inorganic flame retardant has good thermal stability, low toxic or non-toxic, no corrosive gas, no volatilization, no precipitation during storage, has the advantages of durable flame retardant effect, and a rich source of raw materials, low price. Especially, the inorganic flame retardants are becoming more and more important when the requirements of environmental safety and safety of flame retardant products are becoming stricter. At present, commercial inorganic flame retardants mainly include aluminum hydroxide, magnesium hydroxide, three antimony oxide, two zinc polyphosphate, etc.. Liu Pengbo et al. Chose Mg (OH) 2 as the flame retardant of PVC, and studied its influence on the flame retardant effect and mechanical properties of pvc.
With the addition of Mg (OH) 2 flame retardant, the flame retardancy of PVC was greatly improved. When the amount of Mg (OH) 2 was 60%, the oxygen index increased from 15% to 40%, and the horizontal combustion rate decreased from 0.33mm/s to 0.31mm/s. However, the compatibility between PVC and inorganic flame retardant Mg (OH) 2 is poor, and the mechanical properties of PVC decrease with the addition of flame retardant.
Feng Dingsong joined Al in total of polyvinyl chloride (OH) or 3 Mg (OH) 2. The results show that the filled 40%Al (OH) 3 or Mg (OH) 2 of the burning rate is reduced to half of total pure PVC, when Al (OH) 3 amount accounted for a total of 60% PVC quality, product completely nonflammable; and Al (OH) Mg (OH) 3 compared to 2 of the poor flame retardant effect. When the Al (OH) 3 was pretreated with aluminum coupling agent and then blended with PVC, the mechanical properties were improved obviously, and the flame retardancy was not affected. Adding zinc stearate can obviously improve its fluidity. The strength and fluidity of the blend can be obviously increased by the combination of the two. The flame retardancy of Al (OH) 3 flame retardant polyvinyl chloride prepared by 36% PVC, 60% Al (OH) 3 and 4% aluminate coupling agent is 2S without flame, tensile strength is 18.2MPa, notch impact strength is 4.0kJ/m2.
Zhao Xiaoping screening 3,5 hydrated zinc borate from boron flame retardant; molybdenum flame retardant in screening of PVC flame retardant Ammonium Molybdate Modified by 150g, PVC, 1g antioxidant 3114, 1g melamine, 0.5g lubricant EBS, adding 20g zinc borate flame retardant PVC when the oxygen index reached 18%, but there is a strong formaldehyde molding smell. This phenomenon shows that the boron flame retardant zinc borate can lead to degradation of PVC, not suitable as a main flame retardant PVC; when adding ammonium molybdate 20g flame retardant PVC oxygen index can reach 18.5%, and the processing of non formaldehyde odor, the sample density. The molybdenum series flame retardants do not cause the decomposition of PVC, and the flame retardant effect is better.
The self extinguishing formula was obtained by adding Mn, Ba, Sr, Ca or Mg borate into polyvinyl chloride. Flame retardant polyvinyl chloride with molybdenum compounds such as MoO3, MoS2, (NH4) Mo2O7, CaMoO4 and phosphorus or phosphorus compounds.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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