News Details
Phosphorus containing flame retardant polyolefin
2017-11-24 15:23:48
Phosphorus containing flame retardant polyolefin
Polyolefin containing phosphorus flame retardant is a large family of flame retardants, and plays a very important role in the field of flame retardant.
Halogenated flame retardants due to adverse effects on human health and the environment is more and more countries abandoned, flame retardant polyolefin, because of its high efficiency and low toxicity is paid more attention, a series of products have been developed, and there are a lot of phosphorus containing flame retardant polyolefin reported in literature.
Phosphorus flame retardants are widely used in flame retardant fabrics. The main varieties of flame retardants used at present are phosphorus containing flame retardants. In addition, they are widely used in flame retardant synthetic fibers.
A lot of phosphorus flame retardant can also play in the gas phase and condensed phase flame retardant function, including inhibition of flame, heat, melt flow containing phosphoric acid, carbonic acid catalytic surface barrier, carbon and oxygen insulation layer, the effect factors on the relative contribution of flame retardant and fire condition categories and flame retardants are related but, in many cases, a variety of modes of action are involved in phosphorus flame retardant.
In condensed phase, phosphorus acid in combustion, generate metaphosphate at higher temperature, phosphoric acid and phosphate are dehydrating agent, the polymer direct dehydration carbonization, avoid the formation of combustible gas; at the same time in the burning coke forming fabric surface layer, it can obstruct the burning gas and the flame front the contact, on the other hand, the air and the heat from the burning surface of the fabric from the fabric to prevent from burning. For oxygen containing cellulose fabrics, the flame retardant effect of phosphorus flame retardant is very good.
The volatile flame retardant is flame inhibitor is very effective, they can be cracked into small PO, PO2 and HPO2 in the flame, the hydrogen concentration of free radicals in the flame is reduced, so the combustion reaction in a chain (see reactive 1~4) can not be carried out, so as to prevent the continued burning.
Inorganic phosphorus flame retardant early application of flame retardant cellulose fabric, its main varieties include red phosphorus, ammonium phosphate, sodium phosphate, iron phosphate and other [3]. As early as 1786, ammonium phosphate has been used as a flame retardant.
The mixture of two ammonium hydrogen phosphate and boric acid is good for flame retardancy of fabric fibers. The mixture of two ammonium hydrogen phosphate, boric acid and sodium tungstate is also very effective in flame retardancy of fabrics. These inorganic flame retardants are cheap and easy to dissolve in water, so the finishing methods are simple, but they also have some disadvantages, such as large amount of added, bad handle and poor washing resistance.
An important species of inorganic phosphorus flame retardant is ammonium polyphosphate, and ammonium polyphosphate can be divided into two kinds of low molecular weight and high molecular weight. The former is widely used in the flame retardant of cellulose fiber. Low molecular weight polyphosphate salts are soluble salts, which are often mixed with urea for flame retardant finishing of cellulose fabrics, so as to enhance flame retardant 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.
Red is a kind of inorganic polymer, the molecular formula is n (P4), because only the flame retardant containing phosphorus element, its efficiency is very high, the oxygen index of 7.5% polyamines containing red phosphorus (LOI) up to 35%. Red shortcoming is easy to absorb moisture, and resin compatibility is poor, to produce PH3 gas, the flame retardant products were directly applied to make these red phosphorus flame retardant polymers is greatly limited.
Therefore, people use the method of coating a protective film on the surface of red phosphorus, preparation of Microencapsulated Red phosphorus flame retardant, it not only high flame retardant efficiency, little influence on other properties of polymer and resin, and good compatibility, no moisture absorption and PH3 gas shortcomings, while low smoke, low toxicity, thermal stability very good. At present, microencapsulation has been applied to flame retardant cotton fabrics etc..
Compared with inorganic phosphorus flame retardants, organic phosphorus flame retardants have little influence on the physical and mechanical properties of polymers, and have good compatibility with polymers. Therefore, they have become popular flame retardants in recent years. Foreign countries have a series of organic phosphorus flame retardant agent are put into use, and new products have been developed, the research and development of organic phosphorus flame retardant in China is more, but the real production of products is still rare, therefore, organic phosphorus flame retardant in China has very good prospects for development the.
Organic phosphorus flame retardants include phosphorus (phosphonate) ester, phosphite ester, organic phosphorus salt, phosphine oxide, phosphorus polyol, etc., but the most widely used is phosphorus (phosphonate) ester and its oligomer. If the Fyrol76 is made of vinyl phosphonic acid (two 2- chloroethyl) an oligomer ester and methyl phosphonate polycondensation, it can be used alone, can also be used with N- hydroxymethyl acrylamide with potassium persulfate as a catalyst for free radical polymerization, the hydroxymethyl cellulose grafted on N- on the cellulose containing fabric, such as cotton or blended fabric for flame retardant.
The most widely used organic phosphorus salt in flame retardant textiles is four hydroxymethyl phosphonium chloride (THPC). It is also one of the most widely used flame retardants in the world, and its molecular formula is [P (CH2OH) 4]Cl. THPC not only has excellent flame retardant effect, but also has little influence on other properties and handle of fabric. At present, a variety of flame retardant finishing technologies have been developed with THPC as the center, including THPC- amine method, THPOH (four hydroxymethyl phosphine oxide) amine method and Proban method, etc.. In addition, the preparation process of THPC was improved, and other similar organophosphorus flame retardants such as THPS (four hydroxymethyl phosphine sulfate) and THPA (four hydroxymethyl phosphate acetate) were prepared.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Polyolefin containing phosphorus flame retardant is a large family of flame retardants, and plays a very important role in the field of flame retardant.
Halogenated flame retardants due to adverse effects on human health and the environment is more and more countries abandoned, flame retardant polyolefin, because of its high efficiency and low toxicity is paid more attention, a series of products have been developed, and there are a lot of phosphorus containing flame retardant polyolefin reported in literature.
Phosphorus flame retardants are widely used in flame retardant fabrics. The main varieties of flame retardants used at present are phosphorus containing flame retardants. In addition, they are widely used in flame retardant synthetic fibers.
A lot of phosphorus flame retardant can also play in the gas phase and condensed phase flame retardant function, including inhibition of flame, heat, melt flow containing phosphoric acid, carbonic acid catalytic surface barrier, carbon and oxygen insulation layer, the effect factors on the relative contribution of flame retardant and fire condition categories and flame retardants are related but, in many cases, a variety of modes of action are involved in phosphorus flame retardant.
In condensed phase, phosphorus acid in combustion, generate metaphosphate at higher temperature, phosphoric acid and phosphate are dehydrating agent, the polymer direct dehydration carbonization, avoid the formation of combustible gas; at the same time in the burning coke forming fabric surface layer, it can obstruct the burning gas and the flame front the contact, on the other hand, the air and the heat from the burning surface of the fabric from the fabric to prevent from burning. For oxygen containing cellulose fabrics, the flame retardant effect of phosphorus flame retardant is very good.
The volatile flame retardant is flame inhibitor is very effective, they can be cracked into small PO, PO2 and HPO2 in the flame, the hydrogen concentration of free radicals in the flame is reduced, so the combustion reaction in a chain (see reactive 1~4) can not be carried out, so as to prevent the continued burning.
Inorganic phosphorus flame retardant early application of flame retardant cellulose fabric, its main varieties include red phosphorus, ammonium phosphate, sodium phosphate, iron phosphate and other [3]. As early as 1786, ammonium phosphate has been used as a flame retardant.
The mixture of two ammonium hydrogen phosphate and boric acid is good for flame retardancy of fabric fibers. The mixture of two ammonium hydrogen phosphate, boric acid and sodium tungstate is also very effective in flame retardancy of fabrics. These inorganic flame retardants are cheap and easy to dissolve in water, so the finishing methods are simple, but they also have some disadvantages, such as large amount of added, bad handle and poor washing resistance.
An important species of inorganic phosphorus flame retardant is ammonium polyphosphate, and ammonium polyphosphate can be divided into two kinds of low molecular weight and high molecular weight. The former is widely used in the flame retardant of cellulose fiber. Low molecular weight polyphosphate salts are soluble salts, which are often mixed with urea for flame retardant finishing of cellulose fabrics, so as to enhance flame retardant 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.
Red is a kind of inorganic polymer, the molecular formula is n (P4), because only the flame retardant containing phosphorus element, its efficiency is very high, the oxygen index of 7.5% polyamines containing red phosphorus (LOI) up to 35%. Red shortcoming is easy to absorb moisture, and resin compatibility is poor, to produce PH3 gas, the flame retardant products were directly applied to make these red phosphorus flame retardant polymers is greatly limited.
Therefore, people use the method of coating a protective film on the surface of red phosphorus, preparation of Microencapsulated Red phosphorus flame retardant, it not only high flame retardant efficiency, little influence on other properties of polymer and resin, and good compatibility, no moisture absorption and PH3 gas shortcomings, while low smoke, low toxicity, thermal stability very good. At present, microencapsulation has been applied to flame retardant cotton fabrics etc..
Compared with inorganic phosphorus flame retardants, organic phosphorus flame retardants have little influence on the physical and mechanical properties of polymers, and have good compatibility with polymers. Therefore, they have become popular flame retardants in recent years. Foreign countries have a series of organic phosphorus flame retardant agent are put into use, and new products have been developed, the research and development of organic phosphorus flame retardant in China is more, but the real production of products is still rare, therefore, organic phosphorus flame retardant in China has very good prospects for development the.
Organic phosphorus flame retardants include phosphorus (phosphonate) ester, phosphite ester, organic phosphorus salt, phosphine oxide, phosphorus polyol, etc., but the most widely used is phosphorus (phosphonate) ester and its oligomer. If the Fyrol76 is made of vinyl phosphonic acid (two 2- chloroethyl) an oligomer ester and methyl phosphonate polycondensation, it can be used alone, can also be used with N- hydroxymethyl acrylamide with potassium persulfate as a catalyst for free radical polymerization, the hydroxymethyl cellulose grafted on N- on the cellulose containing fabric, such as cotton or blended fabric for flame retardant.
The most widely used organic phosphorus salt in flame retardant textiles is four hydroxymethyl phosphonium chloride (THPC). It is also one of the most widely used flame retardants in the world, and its molecular formula is [P (CH2OH) 4]Cl. THPC not only has excellent flame retardant effect, but also has little influence on other properties and handle of fabric. At present, a variety of flame retardant finishing technologies have been developed with THPC as the center, including THPC- amine method, THPOH (four hydroxymethyl phosphine oxide) amine method and Proban method, etc.. In addition, the preparation process of THPC was improved, and other similar organophosphorus flame retardants such as THPS (four hydroxymethyl phosphine sulfate) and THPA (four hydroxymethyl phosphate acetate) were prepared.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian