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Halogen-free flame retardant of polyolefin
2017-12-6 10:42:15
Halogen-free flame retardant of polyolefin
In recent years, the application of polyolefin halogen-free flame retardants in polyolefin plastics also has some problems, such as poor compatibility and high quantity of additives, which can achieve the actual effect of flame-retardant, while the excessive addition of polyolefin halogen free flame retardants will lead to the decline of physical and mechanical properties.
In order to improve the shortcomings of polyolefin halogen-free flame retardant agent exists in the use process, both at home and abroad in the research of halogen free flame retardant polyolefin, such as to improve the inorganic flame retardant effect, the inorganic flame retardant size of ultra fine processing, surface modification and synergistic effect, and achieved good halogen-free polyolefin flame retardant research.
The main varieties of inorganic flame retardant used at present are three oxidation two antimony, aluminium hydroxide, magnesium hydroxide hydrate (ATH), red phosphorus, expandable graphite and poly phosphoric acid amine. Of which three oxidation two antimony is mainly used in PVC, but also with a halogen containing flame retardant and have better effect, algeldrate (ATH), hydrated magnesium hydroxide is widely used, but its amount in more than 50% have a flame retardant effect, so it is carries on the processing and then added to the plastic. In addition, its compatibility with the plastic is not good, not easy to disperse in plastic, which often will greatly deteriorate the physical and mechanical properties and processing properties of plastic products.
At present, there are three main ways to deal with inorganic filled flame retardants as mentioned above.
First, the particle size of flame retardant particles is super fined. After ultrafine refinement, the particles become smaller, the specific surface area increases, and the surface energy increases, so that the reactivity of particles surface is enhanced. This not only facilitates the dispersion of the particles in the plastic matrix, but also improves the interfacial bonding force between the flame retardant and the plastic material. Therefore, the flame retardants will not only give full play to the flame retardancy, but also may improve the processing and molding properties of the matrix materials and the mechanical properties of the products.
Two is the surface modification of inorganic flame retardant particles, and surface modification technology is one of the key technologies to improve the application performance of the powder.
Through a variety of surface modification agent and surface state of flame retardant chemical reaction on the particle surface and surface coating treatment to change the flame retardant particles, in order to improve the flame retardant surface activity, its surface physical and chemical features, so as to improve the affinity between the flame retardant and plastic, is conducive to flame retardant dispersion in the matrix. To improve the processing performance and mechanical properties of plastics.
Three is the compound treatment of flame retardants, compounding technology of flame retardant mainly refers to the use of flame retardant synergistic effect between the two or more than two kinds of flame retardant agent compound and mixed, made of composite flame retardants, which are mutually synergistic, complement each other, so as to reduce the dosage of fire retardant, improve flame retardant performance, processing performance and mechanical properties of the plastic effect.
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.
Studies have shown that, with magnesium hydroxide as flame retardant and silane coupling agent as modifier, flame retardant polypropylene is found: with the increase of magnesium hydroxide dosage, the flame retardancy of composite system is gradually improved, and the highest oxygen index can reach 35. But with the increase of the addition of magnesium hydroxide, the mechanical properties of polypropylene, such as tensile strength and impact strength, will decrease obviously.
Chen of zinc borate and Microencapsulated Red Phosphorus on flame retardant polypropylene (PP) / synergistic flame retardant effect of magnesium hydroxide system. The results showed that adding zinc borate improves the tensile strength and elongation at break of PP / magnesium hydroxide flame retardant system; the zinc borate and Microencapsulated Red Phosphorus improved the thermal stability of the composites, so as to further improve the flame retardant properties of flame retardant PP / magnesium hydroxide system.
When the dosage of zinc borate was 4% and the amount of magnesium hydroxide was 45%, the flame retardant grade of flame retardant PP / magnesium hydroxide / zinc borate reached the V-0 grade of vertical combustion. Chen also used surface modified magnesium hydroxide to flame retardant PP. After modification, the particle size of magnesium hydroxide was between 2.0~2.5 and m, and the oxygen index of the modified magnesium hydroxide was 30.2 when added to the flame retardant PP mass ratio of 1 to 1.
The development of organophosphorus flame retardants in the study of polyolefin halogen free flame retardant. Because of the problems of high volatility, poor thermal stability and toxicity of phosphorus halogen flame retardants, a large number of new organophosphorous flame retardants have been developed, and some of them have been industrialized in recent years.
In addition, the flame retardants with nitrogen and silicon as flame retardants have attracted wide attention because of their advantages of high efficiency, low smoke, low toxicity, green environmental protection and so on. Therefore, in the molecular design of Organophosphorous flame retardants, phosphorus nitrogen flame retardants or phosphorus silicon flame retardants can often play synergistic flame retardancy with the introduction of nitrogen or silicon elements.
The use of halogen - containing flame retardants is limited, which makes the research and development of non halogen flame retardants, especially organophosphorus flame retardants, become more important. The decomposition products of organophosphorus compounds and their flame retardants and flame retardants have few corrosive and toxic substances. Organic phosphorus flame retardant has become a hot topic in the research of flame retardants. Apart from the above factors, it also plays an important role in improving the comprehensive properties of plastics, because organic phosphorus flame retardant has both plasticizing and thermal stabilization.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
In recent years, the application of polyolefin halogen-free flame retardants in polyolefin plastics also has some problems, such as poor compatibility and high quantity of additives, which can achieve the actual effect of flame-retardant, while the excessive addition of polyolefin halogen free flame retardants will lead to the decline of physical and mechanical properties.
In order to improve the shortcomings of polyolefin halogen-free flame retardant agent exists in the use process, both at home and abroad in the research of halogen free flame retardant polyolefin, such as to improve the inorganic flame retardant effect, the inorganic flame retardant size of ultra fine processing, surface modification and synergistic effect, and achieved good halogen-free polyolefin flame retardant research.
The main varieties of inorganic flame retardant used at present are three oxidation two antimony, aluminium hydroxide, magnesium hydroxide hydrate (ATH), red phosphorus, expandable graphite and poly phosphoric acid amine. Of which three oxidation two antimony is mainly used in PVC, but also with a halogen containing flame retardant and have better effect, algeldrate (ATH), hydrated magnesium hydroxide is widely used, but its amount in more than 50% have a flame retardant effect, so it is carries on the processing and then added to the plastic. In addition, its compatibility with the plastic is not good, not easy to disperse in plastic, which often will greatly deteriorate the physical and mechanical properties and processing properties of plastic products.
At present, there are three main ways to deal with inorganic filled flame retardants as mentioned above.
First, the particle size of flame retardant particles is super fined. After ultrafine refinement, the particles become smaller, the specific surface area increases, and the surface energy increases, so that the reactivity of particles surface is enhanced. This not only facilitates the dispersion of the particles in the plastic matrix, but also improves the interfacial bonding force between the flame retardant and the plastic material. Therefore, the flame retardants will not only give full play to the flame retardancy, but also may improve the processing and molding properties of the matrix materials and the mechanical properties of the products.
Two is the surface modification of inorganic flame retardant particles, and surface modification technology is one of the key technologies to improve the application performance of the powder.
Through a variety of surface modification agent and surface state of flame retardant chemical reaction on the particle surface and surface coating treatment to change the flame retardant particles, in order to improve the flame retardant surface activity, its surface physical and chemical features, so as to improve the affinity between the flame retardant and plastic, is conducive to flame retardant dispersion in the matrix. To improve the processing performance and mechanical properties of plastics.
Three is the compound treatment of flame retardants, compounding technology of flame retardant mainly refers to the use of flame retardant synergistic effect between the two or more than two kinds of flame retardant agent compound and mixed, made of composite flame retardants, which are mutually synergistic, complement each other, so as to reduce the dosage of fire retardant, improve flame retardant performance, processing performance and mechanical properties of the plastic effect.
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.
Studies have shown that, with magnesium hydroxide as flame retardant and silane coupling agent as modifier, flame retardant polypropylene is found: with the increase of magnesium hydroxide dosage, the flame retardancy of composite system is gradually improved, and the highest oxygen index can reach 35. But with the increase of the addition of magnesium hydroxide, the mechanical properties of polypropylene, such as tensile strength and impact strength, will decrease obviously.
Chen of zinc borate and Microencapsulated Red Phosphorus on flame retardant polypropylene (PP) / synergistic flame retardant effect of magnesium hydroxide system. The results showed that adding zinc borate improves the tensile strength and elongation at break of PP / magnesium hydroxide flame retardant system; the zinc borate and Microencapsulated Red Phosphorus improved the thermal stability of the composites, so as to further improve the flame retardant properties of flame retardant PP / magnesium hydroxide system.
When the dosage of zinc borate was 4% and the amount of magnesium hydroxide was 45%, the flame retardant grade of flame retardant PP / magnesium hydroxide / zinc borate reached the V-0 grade of vertical combustion. Chen also used surface modified magnesium hydroxide to flame retardant PP. After modification, the particle size of magnesium hydroxide was between 2.0~2.5 and m, and the oxygen index of the modified magnesium hydroxide was 30.2 when added to the flame retardant PP mass ratio of 1 to 1.
The development of organophosphorus flame retardants in the study of polyolefin halogen free flame retardant. Because of the problems of high volatility, poor thermal stability and toxicity of phosphorus halogen flame retardants, a large number of new organophosphorous flame retardants have been developed, and some of them have been industrialized in recent years.
In addition, the flame retardants with nitrogen and silicon as flame retardants have attracted wide attention because of their advantages of high efficiency, low smoke, low toxicity, green environmental protection and so on. Therefore, in the molecular design of Organophosphorous flame retardants, phosphorus nitrogen flame retardants or phosphorus silicon flame retardants can often play synergistic flame retardancy with the introduction of nitrogen or silicon elements.
The use of halogen - containing flame retardants is limited, which makes the research and development of non halogen flame retardants, especially organophosphorus flame retardants, become more important. The decomposition products of organophosphorus compounds and their flame retardants and flame retardants have few corrosive and toxic substances. Organic phosphorus flame retardant has become a hot topic in the research of flame retardants. Apart from the above factors, it also plays an important role in improving the comprehensive properties of plastics, because organic phosphorus flame retardant has both plasticizing and thermal stabilization.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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