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Flame retardant mechanism of polypropylene flame retardant
2017-11-17 11:48:58
Flame retardant mechanism of polypropylene flame retardant
Polypropylene (PP) is a kind of general purpose plastics. It is widely used in automobile, home appliance, textile, building and other industries because of its advantages such as convenient processing, excellent mechanical, electrical insulation and chemical resistance, non-toxic, small density, light weight and so on. However, due to its low oxygen index, easy combustion, large combustion heat and large amount of droplets, it is easy to spread flame, so its application in many fields has been limited.
At present, the flame retardant method of polypropylene is mainly adding flame retardant method, this method is simple and easy to use, and the flame retardant can be used in many kinds of products and the cost is low, which is the main preparation method of flame retardant polypropylene. This paper summarizes the research progress of flame retardant mechanism of polypropylene flame retardant at home and abroad in recent years.
The flame retardant mechanism of polypropylene flame retardant can be divided into the following categories: A. interrupt chain reaction, termination of radical chain reaction of polypropylene combustion. Such as halogen flame retardant decomposition at higher temperatures, the release of HX, HX capture polypropylene combustion process of free radicals, interrupted combustion chain reaction to achieve flame retardant purposes. B. absorbs the heat produced by combustion decomposition of polypropylene and reduces the temperature of the system.
Such as aluminum hydroxide and boric acid inorganic flame retardant. C. dilute the concentration of flammable substances and oxygen concentration, so as to reduce below the ignition limit. D. promotes the formation of carbon and reduces the formation of combustible gases. A porous and homogeneous carbon layer is formed on the surface of the material, which plays a role of heat insulation, oxygen separation, smoke suppression and droplet prevention, so as to achieve the purpose of flame retardant. Phosphorus and intumescent flame retardants are the main flame retardant mechanisms.
The flame retardant mechanism of the above mentioned polypropylene flame retardants is often applicable to composite flame retardants, such as antimony halogen, phosphorus halogen, phosphorus nitrogen coordination system.
The inorganic flame retardant non-toxic, good thermal stability, smoke suppression, release water and absorb a large amount of heat generated when heated, water vapor can dilute combustible gas concentration and air resistance; metal oxide formed from a protective layer to prevent the solid combustion reaction to continue. Its disadvantage is the large amount of added, lack of affinity with polypropylene, dispersion and compatibility are poor, the mechanical properties of the material decreased. The interfacial adhesion between polypropylene and polypropylene can be enhanced by ultra fining and surface treatment of inorganic flame retardant particles.
Using the quantum size effect and surface effect of ultrafine particle itself to enhance the interface effect with polypropylene, improve the compatibility, achieve the purpose of reducing the amount and improving the flame retardant efficiency. The finer the flame retardant particles, the smaller the dosage and the amount of smoke, the more obvious the flame retardant effect. Therefore, ultra refinement is the main development direction of inorganic flame retardant in the future.
Yao Jialiang of nano-Mg (OH) 2 and micro-Mg (OH) 2 PP Filled with flame retardant, flow and mechanical properties of the same mass fraction of nano flame retardant performance is better than micron filling system, the filling amount reached V~0 level of 60%, and less smoke, flow and mechanical properties better than micron filling system.
The flame retardant synergistic effect of different decomposition temperature can produce flame retardant synergistic effect, and the mixed flame retardant continuously releases water vapor in a wide temperature range, so that polypropylene is in a low oxygen concentration environment before and after combustion, and the flame retardant effect is better than that of a single flame retardant. Qu Minjie studied the synergistic effect of Al (OH) 3, Mg (OH) 2 and their two on the flame retardant properties and mechanical properties of polypropylene. The two ratios were suitable, and the smoke suppression effect was remarkable due to synergistic effect. Compound flame retardant system can reduce the amount of single flame retardant.
Triphenyl Phosphate (TPP)
The product output : 100 tons / month
Shipping Port: China Shanghai
Price offer is valid : 15 days
Export rights: the right to import and export company .
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.
If inorganic flame retardant has good flame retardant effect, non-toxic and smoke suppression advantages, combined with organic flame retardant, it can effectively reduce the toxic halogen and bromine dosage, and give full play to the synergistic flame retardant effect of the two.
With Mg (OH) 2? Al (OH) 3? P as polypropylene composite flame retardant, polypropylene Mg (OH) 2? Al (OH) 3? P=100? 50? 50? 5, the flame retardant properties and mechanical properties meet the application requirements. It is beneficial to improve the comprehensive properties of polypropylene by adding brominated flame retardants in inorganic flame retardants. When 15 0.6~3m Mg (OH) 2 and ten brominated diphenyl ethers were mixed with flame retardant random copolymer polypropylene (PP R), the oxygen index reached 27%. A certain amount of Mg (OH) 2 has toughening effect on polypropylene R.
Melamine polyphosphate was added to Mg (OH) 2 polypropylene R system, which exhibited the highest flame retardancy compared with intumescent flame retardants such as pentaerythritol (PER), urea polyphosphate and zinc borate.
In addition, other inorganic particles can also improve the flame retardancy of polypropylene. In the polypropylene A polypropylene PA-6 expansion system with mica filler, the flame retardant properties of mica particles can be increased by the formation of ceramic protective layer on the surface of the system after combustion.
The modified kaolin prepared by the reaction of iron ion chelating resin with kaolin significantly reduced the amount of tobacco production and the rate of heat release. Surface modification improves the dispersion state of inorganic particles in polypropylene and improves flame retardancy and mechanical properties.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Polypropylene (PP) is a kind of general purpose plastics. It is widely used in automobile, home appliance, textile, building and other industries because of its advantages such as convenient processing, excellent mechanical, electrical insulation and chemical resistance, non-toxic, small density, light weight and so on. However, due to its low oxygen index, easy combustion, large combustion heat and large amount of droplets, it is easy to spread flame, so its application in many fields has been limited.
At present, the flame retardant method of polypropylene is mainly adding flame retardant method, this method is simple and easy to use, and the flame retardant can be used in many kinds of products and the cost is low, which is the main preparation method of flame retardant polypropylene. This paper summarizes the research progress of flame retardant mechanism of polypropylene flame retardant at home and abroad in recent years.
The flame retardant mechanism of polypropylene flame retardant can be divided into the following categories: A. interrupt chain reaction, termination of radical chain reaction of polypropylene combustion. Such as halogen flame retardant decomposition at higher temperatures, the release of HX, HX capture polypropylene combustion process of free radicals, interrupted combustion chain reaction to achieve flame retardant purposes. B. absorbs the heat produced by combustion decomposition of polypropylene and reduces the temperature of the system.
Such as aluminum hydroxide and boric acid inorganic flame retardant. C. dilute the concentration of flammable substances and oxygen concentration, so as to reduce below the ignition limit. D. promotes the formation of carbon and reduces the formation of combustible gases. A porous and homogeneous carbon layer is formed on the surface of the material, which plays a role of heat insulation, oxygen separation, smoke suppression and droplet prevention, so as to achieve the purpose of flame retardant. Phosphorus and intumescent flame retardants are the main flame retardant mechanisms.
The flame retardant mechanism of the above mentioned polypropylene flame retardants is often applicable to composite flame retardants, such as antimony halogen, phosphorus halogen, phosphorus nitrogen coordination system.
The inorganic flame retardant non-toxic, good thermal stability, smoke suppression, release water and absorb a large amount of heat generated when heated, water vapor can dilute combustible gas concentration and air resistance; metal oxide formed from a protective layer to prevent the solid combustion reaction to continue. Its disadvantage is the large amount of added, lack of affinity with polypropylene, dispersion and compatibility are poor, the mechanical properties of the material decreased. The interfacial adhesion between polypropylene and polypropylene can be enhanced by ultra fining and surface treatment of inorganic flame retardant particles.
Using the quantum size effect and surface effect of ultrafine particle itself to enhance the interface effect with polypropylene, improve the compatibility, achieve the purpose of reducing the amount and improving the flame retardant efficiency. The finer the flame retardant particles, the smaller the dosage and the amount of smoke, the more obvious the flame retardant effect. Therefore, ultra refinement is the main development direction of inorganic flame retardant in the future.
Yao Jialiang of nano-Mg (OH) 2 and micro-Mg (OH) 2 PP Filled with flame retardant, flow and mechanical properties of the same mass fraction of nano flame retardant performance is better than micron filling system, the filling amount reached V~0 level of 60%, and less smoke, flow and mechanical properties better than micron filling system.
The flame retardant synergistic effect of different decomposition temperature can produce flame retardant synergistic effect, and the mixed flame retardant continuously releases water vapor in a wide temperature range, so that polypropylene is in a low oxygen concentration environment before and after combustion, and the flame retardant effect is better than that of a single flame retardant. Qu Minjie studied the synergistic effect of Al (OH) 3, Mg (OH) 2 and their two on the flame retardant properties and mechanical properties of polypropylene. The two ratios were suitable, and the smoke suppression effect was remarkable due to synergistic effect. Compound flame retardant system can reduce the amount of single flame retardant.
Triphenyl Phosphate (TPP)
The product output : 100 tons / month
Shipping Port: China Shanghai
Price offer is valid : 15 days
Export rights: the right to import and export company .
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.
If inorganic flame retardant has good flame retardant effect, non-toxic and smoke suppression advantages, combined with organic flame retardant, it can effectively reduce the toxic halogen and bromine dosage, and give full play to the synergistic flame retardant effect of the two.
With Mg (OH) 2? Al (OH) 3? P as polypropylene composite flame retardant, polypropylene Mg (OH) 2? Al (OH) 3? P=100? 50? 50? 5, the flame retardant properties and mechanical properties meet the application requirements. It is beneficial to improve the comprehensive properties of polypropylene by adding brominated flame retardants in inorganic flame retardants. When 15 0.6~3m Mg (OH) 2 and ten brominated diphenyl ethers were mixed with flame retardant random copolymer polypropylene (PP R), the oxygen index reached 27%. A certain amount of Mg (OH) 2 has toughening effect on polypropylene R.
Melamine polyphosphate was added to Mg (OH) 2 polypropylene R system, which exhibited the highest flame retardancy compared with intumescent flame retardants such as pentaerythritol (PER), urea polyphosphate and zinc borate.
In addition, other inorganic particles can also improve the flame retardancy of polypropylene. In the polypropylene A polypropylene PA-6 expansion system with mica filler, the flame retardant properties of mica particles can be increased by the formation of ceramic protective layer on the surface of the system after combustion.
The modified kaolin prepared by the reaction of iron ion chelating resin with kaolin significantly reduced the amount of tobacco production and the rate of heat release. Surface modification improves the dispersion state of inorganic particles in polypropylene and improves flame retardancy and mechanical properties.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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