News Details
Polyurethane organic phosphorus flame retardant
2017-11-27 10:58:29
Polyurethane organic phosphorus flame retardant
There are many classification methods for flame retardants, which are divided into two categories: inorganic flame retardant and organic flame retardant.
Inorganic flame retardants are mainly additive type, which are mainly used in thermoplastic polyurethane, including antimony series flame retardant, aluminum hydroxide (also known as three aluminum hydrate, ATH), magnesium hydroxide flame retardant, phosphorus inorganic flame retardant, boron containing and molybdenum containing flame retardant and smoke suppressant.
They have the advantages of good thermal stability, low toxicity or non-toxic, no corrosive gas, no volatilization and no precipitation during storage, lasting flame retardant effect, and the raw materials are rich in source and low in price. It is worth noting that because of their large amount of filler in polyurethane, coupled with its inherent characteristics, it will reduce the processing formability, mechanical properties, electrical properties of polyurethane.
Organic flame retardants can be divided into two categories: organic phosphorus series and halogenated flame retardants according to their uses. The classification of flame retardants can be divided into two types: reactive and additive.
Flame retardant agent in reactions in the polymerization or polymerization process, which binds to the main chain or side chain polyurethane, so the effect of stability, durability, impact on the performance of polyurethane; and flame retardants is only dispersed in the flame retardant system, more convenient to use.
Organic phosphorus flame retardants are mostly liquid, both plasticizing and lubricity, but also the processing aids of polyurethane, polyurethane organic phosphorus flame retardants mainly include halogen phosphate ester, halogen containing phosphite ester, non halogen phosphate ester and non halogen phosphite. Phosphate is generally used as a polyurethane organic phosphorus flame retardant and plasticizer, phosphite is generally used as polyurethane organic phosphorus flame retardant and heat stabilizer.
Polyurethane containing more than 5% phosphorus can produce significant flame retardant effect. The flame retardant mechanism is as follows: when heated, it decomposes and produces very strong dehydration of partial phosphoric acid and meta phosphoric acid, so that the surface of the polyurethane is formed into carbonized layer, and the surface of the polyurethane is directly contacted with the air, so that the flame is extinguished, so as to achieve the purpose of flame retardant.
Polyurethane material is the best thermal insulation material at present in the world. A class of polymers containing NHCOO - repeating structural units in the main chain. English abbreviation PU. Polymerization of isocyanate (monomer) with hydroxyl compounds. Because of the strong polarity of urethane group, insoluble in non-polar group, it has good oil resistance, toughness, wear resistance, aging resistance and adhesion. Materials suitable for a wide range of temperatures (-50 ~ 150) can be prepared from different raw materials, including elastomers, thermoplastic resins and thermosetting resins. Under high temperature, it is neither resistant to hydrolysis nor resistant to alkaline medium.
Tris(2-chloroisopropyl)Phosphate(TCPP)
The production process of flame retardant TCPP with the following steps:
(1) to three phosphorus oxychloride and epichlorohydrin by phosphoric acid, three in catalysis of AlCl3 (2, 3- two Lv Bingji) ester mixture.
(2) added to the mixed solutions of alkali, alkali washing to neutral, static stratified, removing water; reservoir water again after the static stratified, removing water, reservoir after distillation liquid phosphoric acid three (2, 3- two Lv Bingji) ester, and the nitrogen gas purification. This process has the advantages of simple preparation process, to produce phosphoric acid three (2, 3- two Lv Bingji) ester as compared with the existing production process of high purity, its quality detection results were better than the existing technology in the production process to produce phosphoric acid three (2, 3- two chloropropyl) ester.
Process the above description of the product, such as the flame retardant TCPP production technology to further understand please contact us.
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.
Commonly used monomers such as toluene diisocyanate, two benzene diisocyanate, etc.. Polyols are classified into 3 types: simple Polyols (ethylene glycol, glycerol, etc.), polyester oligomers containing terminal hydroxyl groups, polyesters for polyurethane, and polyether oligomers containing terminal hydroxyl groups, to prepare polyether polyurethanes. Polymerization methods vary with material properties. Synthetic elastomer before preparation of low molecular weight diols, with excessive aromatic or aliphatic isocyanate reaction, generating isocyanate (-NCO) terminated prepolymer and polyol, chain extender, thermoplastic elastomer obtained by two yuan; if the diamine chain extender and further crosslinked to casting elastic body.
The prepolymer was expanded by hydrazine or two amine chain to obtain elastic fiber; the prepolymer with more isocyanate was mixed with catalyst and foaming agent, and then the rigid foam was obtained directly. If the monomer, polyether, water, catalyst and other mixed, one step reaction can be obtained soft foam. The coating can be obtained by reacting monomers with polyols in solution; the adhesive is mixed and reacted with polyisocyanate monomers and low molecular weight polyesters or polyethers.
Chlorinated flame retardants are the most commonly used chlorinated paraffin, chlorinated polyethylene, etc., the former is cheap and easy to obtain, and both plasticizers, at home and abroad a large amount of consumption. Other main varieties are: four chloro bisphenol A, four chloro phthalic anhydride (TCPA), six chlorobenzene (HCB), epichlorohydrin, polyvinylidene chloride (PVDC), chlorinated polyvinyl chloride (PVC), etc. (two).
Brominated flame retardants have the characteristics of little addition, little impact on the properties of flame retardant products, good compatibility, thermal stability and flame retardant effect, and they are the most important types of flame retardants in organic flame retardants. There are more than 100 varieties abroad, the yield of which is about 15%~20% of organic flame retardant, and the development of our country is also fast, and there are more than 20 varieties.
Flame retardant mechanism of brominated flame retardants and chlorine for decomposition at high temperature to produce hydrogen halide (HX), its density than air, deposition in the outer combustion, dilute or isolate the fresh air, the fuel oxygen free radical HO HX asphyxia; fast capture burning? (HX+OH,? H? +H2O), slowing the burning rate of polyurethane, reduce the formation of combustible gas, so that the flame is extinguished and reduced.
In addition, when halogen flame retardants are used together with Sb2O3, synergistic effects can be produced. The three antimony halides (SbX3) will be sublimated into very fine particles, which are surrounded by smoke around the polyurethane, hindering the entry of fresh air and rapidly extinguishing the flame. The development trend of brominated flame retardants is to increase bromine content and increase molecular weight.
It is worth noting that, due to the combustion and flame retardant process are very complex, in terms of polyurethane flame retardant system, is moving through the splicing of inorganic and organic flame retardant, flame retardant synergistic effect of various direction, so the actual flame retardant system is often several kinds of flame retardant mechanism operating at the same time.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
There are many classification methods for flame retardants, which are divided into two categories: inorganic flame retardant and organic flame retardant.
Inorganic flame retardants are mainly additive type, which are mainly used in thermoplastic polyurethane, including antimony series flame retardant, aluminum hydroxide (also known as three aluminum hydrate, ATH), magnesium hydroxide flame retardant, phosphorus inorganic flame retardant, boron containing and molybdenum containing flame retardant and smoke suppressant.
They have the advantages of good thermal stability, low toxicity or non-toxic, no corrosive gas, no volatilization and no precipitation during storage, lasting flame retardant effect, and the raw materials are rich in source and low in price. It is worth noting that because of their large amount of filler in polyurethane, coupled with its inherent characteristics, it will reduce the processing formability, mechanical properties, electrical properties of polyurethane.
Organic flame retardants can be divided into two categories: organic phosphorus series and halogenated flame retardants according to their uses. The classification of flame retardants can be divided into two types: reactive and additive.
Flame retardant agent in reactions in the polymerization or polymerization process, which binds to the main chain or side chain polyurethane, so the effect of stability, durability, impact on the performance of polyurethane; and flame retardants is only dispersed in the flame retardant system, more convenient to use.
Organic phosphorus flame retardants are mostly liquid, both plasticizing and lubricity, but also the processing aids of polyurethane, polyurethane organic phosphorus flame retardants mainly include halogen phosphate ester, halogen containing phosphite ester, non halogen phosphate ester and non halogen phosphite. Phosphate is generally used as a polyurethane organic phosphorus flame retardant and plasticizer, phosphite is generally used as polyurethane organic phosphorus flame retardant and heat stabilizer.
Polyurethane containing more than 5% phosphorus can produce significant flame retardant effect. The flame retardant mechanism is as follows: when heated, it decomposes and produces very strong dehydration of partial phosphoric acid and meta phosphoric acid, so that the surface of the polyurethane is formed into carbonized layer, and the surface of the polyurethane is directly contacted with the air, so that the flame is extinguished, so as to achieve the purpose of flame retardant.
Polyurethane material is the best thermal insulation material at present in the world. A class of polymers containing NHCOO - repeating structural units in the main chain. English abbreviation PU. Polymerization of isocyanate (monomer) with hydroxyl compounds. Because of the strong polarity of urethane group, insoluble in non-polar group, it has good oil resistance, toughness, wear resistance, aging resistance and adhesion. Materials suitable for a wide range of temperatures (-50 ~ 150) can be prepared from different raw materials, including elastomers, thermoplastic resins and thermosetting resins. Under high temperature, it is neither resistant to hydrolysis nor resistant to alkaline medium.
Tris(2-chloroisopropyl)Phosphate(TCPP)
The production process of flame retardant TCPP with the following steps:
(1) to three phosphorus oxychloride and epichlorohydrin by phosphoric acid, three in catalysis of AlCl3 (2, 3- two Lv Bingji) ester mixture.
(2) added to the mixed solutions of alkali, alkali washing to neutral, static stratified, removing water; reservoir water again after the static stratified, removing water, reservoir after distillation liquid phosphoric acid three (2, 3- two Lv Bingji) ester, and the nitrogen gas purification. This process has the advantages of simple preparation process, to produce phosphoric acid three (2, 3- two Lv Bingji) ester as compared with the existing production process of high purity, its quality detection results were better than the existing technology in the production process to produce phosphoric acid three (2, 3- two chloropropyl) ester.
Process the above description of the product, such as the flame retardant TCPP production technology to further understand please contact us.
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.
Commonly used monomers such as toluene diisocyanate, two benzene diisocyanate, etc.. Polyols are classified into 3 types: simple Polyols (ethylene glycol, glycerol, etc.), polyester oligomers containing terminal hydroxyl groups, polyesters for polyurethane, and polyether oligomers containing terminal hydroxyl groups, to prepare polyether polyurethanes. Polymerization methods vary with material properties. Synthetic elastomer before preparation of low molecular weight diols, with excessive aromatic or aliphatic isocyanate reaction, generating isocyanate (-NCO) terminated prepolymer and polyol, chain extender, thermoplastic elastomer obtained by two yuan; if the diamine chain extender and further crosslinked to casting elastic body.
The prepolymer was expanded by hydrazine or two amine chain to obtain elastic fiber; the prepolymer with more isocyanate was mixed with catalyst and foaming agent, and then the rigid foam was obtained directly. If the monomer, polyether, water, catalyst and other mixed, one step reaction can be obtained soft foam. The coating can be obtained by reacting monomers with polyols in solution; the adhesive is mixed and reacted with polyisocyanate monomers and low molecular weight polyesters or polyethers.
Chlorinated flame retardants are the most commonly used chlorinated paraffin, chlorinated polyethylene, etc., the former is cheap and easy to obtain, and both plasticizers, at home and abroad a large amount of consumption. Other main varieties are: four chloro bisphenol A, four chloro phthalic anhydride (TCPA), six chlorobenzene (HCB), epichlorohydrin, polyvinylidene chloride (PVDC), chlorinated polyvinyl chloride (PVC), etc. (two).
Brominated flame retardants have the characteristics of little addition, little impact on the properties of flame retardant products, good compatibility, thermal stability and flame retardant effect, and they are the most important types of flame retardants in organic flame retardants. There are more than 100 varieties abroad, the yield of which is about 15%~20% of organic flame retardant, and the development of our country is also fast, and there are more than 20 varieties.
Flame retardant mechanism of brominated flame retardants and chlorine for decomposition at high temperature to produce hydrogen halide (HX), its density than air, deposition in the outer combustion, dilute or isolate the fresh air, the fuel oxygen free radical HO HX asphyxia; fast capture burning? (HX+OH,? H? +H2O), slowing the burning rate of polyurethane, reduce the formation of combustible gas, so that the flame is extinguished and reduced.
In addition, when halogen flame retardants are used together with Sb2O3, synergistic effects can be produced. The three antimony halides (SbX3) will be sublimated into very fine particles, which are surrounded by smoke around the polyurethane, hindering the entry of fresh air and rapidly extinguishing the flame. The development trend of brominated flame retardants is to increase bromine content and increase molecular weight.
It is worth noting that, due to the combustion and flame retardant process are very complex, in terms of polyurethane flame retardant system, is moving through the splicing of inorganic and organic flame retardant, flame retardant synergistic effect of various direction, so the actual flame retardant system is often several kinds of flame retardant mechanism operating at the same time.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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