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Hard polyurethane foam plastics additive type flame retardant
2017-11-30 11:28:40
Hard polyurethane foam plastics additive type flame retardant
In rigid polyurethane foam, inorganic flame retardant can be added to improve its flame retardancy, which is a method that has long been paid attention to. Among the inorganic compounds, the most used are antimony oxide, aluminum hydroxide, ammonium phosphate, ammonium polyphosphate, Zinc Oxide, sodium silicate, borate and so on.
Rigid polyurethane foam flame retardants are generally solid, with halogen or phosphate compound, and at the same time to superfine and surface treatment, to improve the processing performance, reduce the rigid polyurethane foam additive type flame retardant agent, reduce the amount of smoke, improve the performance of foam products.
The addition of the rigid polyurethane foam plastics to the liquid material is easy to precipitate, which is usually added before or when foamed. After adding solid flame retardants in the composite polyether, it usually needs to be stirred continuously to make the liquid even. Rigid polyurethane foam plastics add flame retardant will make the viscosity of the material increase, reduce the fluidity of the material, and have a negative effect on the foam performance. The finer the particles, the better the flame-retardant performance and the negative influence on the foam properties.
Because of the existence of solid particles, some cases can not be mechanically foamed with a mixed head. For this reason, a special mixed head of mixed solid powder filler is developed at home and abroad.
When the amount of expansive graphite is 10% of the total foam weight and a proper amount of phosphorus flame retardant is added, the flame retardancy of the foam can reach DIN410282 grade. But graphite will increase the opening rate of the hard foam and influence the adiabatic effect.
Triphenyl Phosphate (TPP)
Retardants tpp quality standards:
Appearance: white flaky crystal
Content : ≥ 99%;
Acid value (mgKOH / g): ≤ 0.1;
Free phenol : ≤ 0.1%;
Freezing point : ≥ 47.0 ℃
Chromaticity (APHA): ≤ 60;
Moisture : ≤ 0.1%
Density (50 ℃, g/cm3) :1.185-1 .202
Retardants tpp Packing: NW 25KG / composite paper ( lined with black plastic bags ) , a small cabinet loaded 12.5 tons .
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.
Ammonium polyphosphate (APP) is a kind of white powder of flame retardant, including the development of the APP and APP powder in polyols stable thixotropic dispersions, microcapsules containing APP, APP and nitrogen synergist mixture in the form of Exolit AP series flame retardant for rigid polyurethane foam.
The introduction of 17% ammonium polyphosphate in the polyurethane foam can reach Zixi; using more than 80um size and achieved the best flame retardant effect; add 40%, while maintaining the basic physical and mechanical properties of the foam at the same time, the oxygen index is close to 40, but this time the hygroscopicity of ammonium polyphosphate high foaming component storage, make acid this problem has been rising, people have done a lot of research, and have made certain progress.
Red phosphorus can also be used for flame retardant polyurethane foams, such as ExolitRP 652 is a kind of castor oil as the carrier of the thixotropic dispersion of red phosphorus. TU composite solid flame retardant development of Shanxi Chemical Industry Research Institute of the 1 non halogen composite flame retardants with red phosphorus as the core, and the coordinating role of other flame retardants compounded, the appearance of dark red powder, can be used for polyurethane foam products. When the dosage is 9 parts in the foam formulation, the oxygen index can reach 26.4%, reaching the level of UL94V 0, and it has synergistic effect with a variety of commonly used flame retardants, such as TCEP, DMMP and aluminum hydroxide.
Magnesium hydroxide is a fast developing additive flame retardant, which is low smoke, non-toxic, neutralizing acid and corrosive gases in combustion process. Therefore, it is an environment-friendly green flame retardant. The flame retardancy mechanism is similar to that of ATH. Compared with ATH, the decomposition temperature of Mg (OH) is higher than that of ATH, 1O0 - 150 C, which can be used for flame retardance of engineering plastics with temperatures above 250 C, and also promotes the formation of polymers. But to achieve a certain flame retardant effect, the amount of addition needs to be above 50%, which has a great influence on the properties of the materials. In order to reduce the amount of Mg (OH) 2 in polymer, one way is to make Mg (OH) 2 particles fine. Another way is to modify the surface of Mg (OH) by coating technology, so as to improve its compatibility with polymers.
PC/ABS alloy has excellent comprehensive properties. Although PC itself has a certain flame retardancy (LOI=25%), the flame retardancy decreased after blending with ABS. In order to meet the application of PC/ABS alloy in electronic, electrical switches, electrical appliances and other fields, the flame retardant must be added. The commonly used flame retardants in commercialized flame retardant PC/ABS alloys are brominated flame retardants, such as brominated epoxy resin, brominated polycarbonate, brominated polystyrene, ten bromo two phenyl ethane, phosphate ester flame retardants. For example, TPP, RDP, BAPP; phosphorus one bromine structural flame retardant, such as phosphoric acid three (2, 4 one or two bromo phenyl ester), the commodity brand is KroitePB--460. Their flame retardant PC/ABS alloys have their own characteristics.
A comparative test of flame retardants used in flame retardant PC/ABS alloys was carried out. The results show that when the mass ratio of PC/ABS to 7:3. The brominated flame retardant flame retardant PC/ABS alloy amount of about l3%, the flame retardant properties of materials can reach UL-94V-0 level (1.6nun); phosphate flame retardant agent due to the retarding effect of ABS is not good, only in the material in the mass fraction of PC is greater than 70%, only flame retardant effect: a phosphate flame retardant with bromine. Even in the material, the content of PC was 50%, also can reach the uL-94V-O level (1.6mm), phosphorus and bromine have synergistic effect in the PC/ABS alloy, the phosphate flame retardant with bromine compound used in flame retardant agent, PC/ABS alloy. It also has a similar effect.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
In rigid polyurethane foam, inorganic flame retardant can be added to improve its flame retardancy, which is a method that has long been paid attention to. Among the inorganic compounds, the most used are antimony oxide, aluminum hydroxide, ammonium phosphate, ammonium polyphosphate, Zinc Oxide, sodium silicate, borate and so on.
Rigid polyurethane foam flame retardants are generally solid, with halogen or phosphate compound, and at the same time to superfine and surface treatment, to improve the processing performance, reduce the rigid polyurethane foam additive type flame retardant agent, reduce the amount of smoke, improve the performance of foam products.
The addition of the rigid polyurethane foam plastics to the liquid material is easy to precipitate, which is usually added before or when foamed. After adding solid flame retardants in the composite polyether, it usually needs to be stirred continuously to make the liquid even. Rigid polyurethane foam plastics add flame retardant will make the viscosity of the material increase, reduce the fluidity of the material, and have a negative effect on the foam performance. The finer the particles, the better the flame-retardant performance and the negative influence on the foam properties.
Because of the existence of solid particles, some cases can not be mechanically foamed with a mixed head. For this reason, a special mixed head of mixed solid powder filler is developed at home and abroad.
When the amount of expansive graphite is 10% of the total foam weight and a proper amount of phosphorus flame retardant is added, the flame retardancy of the foam can reach DIN410282 grade. But graphite will increase the opening rate of the hard foam and influence the adiabatic effect.
Triphenyl Phosphate (TPP)
Retardants tpp quality standards:
Appearance: white flaky crystal
Content : ≥ 99%;
Acid value (mgKOH / g): ≤ 0.1;
Free phenol : ≤ 0.1%;
Freezing point : ≥ 47.0 ℃
Chromaticity (APHA): ≤ 60;
Moisture : ≤ 0.1%
Density (50 ℃, g/cm3) :1.185-1 .202
Retardants tpp Packing: NW 25KG / composite paper ( lined with black plastic bags ) , a small cabinet loaded 12.5 tons .
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.
Ammonium polyphosphate (APP) is a kind of white powder of flame retardant, including the development of the APP and APP powder in polyols stable thixotropic dispersions, microcapsules containing APP, APP and nitrogen synergist mixture in the form of Exolit AP series flame retardant for rigid polyurethane foam.
The introduction of 17% ammonium polyphosphate in the polyurethane foam can reach Zixi; using more than 80um size and achieved the best flame retardant effect; add 40%, while maintaining the basic physical and mechanical properties of the foam at the same time, the oxygen index is close to 40, but this time the hygroscopicity of ammonium polyphosphate high foaming component storage, make acid this problem has been rising, people have done a lot of research, and have made certain progress.
Red phosphorus can also be used for flame retardant polyurethane foams, such as ExolitRP 652 is a kind of castor oil as the carrier of the thixotropic dispersion of red phosphorus. TU composite solid flame retardant development of Shanxi Chemical Industry Research Institute of the 1 non halogen composite flame retardants with red phosphorus as the core, and the coordinating role of other flame retardants compounded, the appearance of dark red powder, can be used for polyurethane foam products. When the dosage is 9 parts in the foam formulation, the oxygen index can reach 26.4%, reaching the level of UL94V 0, and it has synergistic effect with a variety of commonly used flame retardants, such as TCEP, DMMP and aluminum hydroxide.
Magnesium hydroxide is a fast developing additive flame retardant, which is low smoke, non-toxic, neutralizing acid and corrosive gases in combustion process. Therefore, it is an environment-friendly green flame retardant. The flame retardancy mechanism is similar to that of ATH. Compared with ATH, the decomposition temperature of Mg (OH) is higher than that of ATH, 1O0 - 150 C, which can be used for flame retardance of engineering plastics with temperatures above 250 C, and also promotes the formation of polymers. But to achieve a certain flame retardant effect, the amount of addition needs to be above 50%, which has a great influence on the properties of the materials. In order to reduce the amount of Mg (OH) 2 in polymer, one way is to make Mg (OH) 2 particles fine. Another way is to modify the surface of Mg (OH) by coating technology, so as to improve its compatibility with polymers.
PC/ABS alloy has excellent comprehensive properties. Although PC itself has a certain flame retardancy (LOI=25%), the flame retardancy decreased after blending with ABS. In order to meet the application of PC/ABS alloy in electronic, electrical switches, electrical appliances and other fields, the flame retardant must be added. The commonly used flame retardants in commercialized flame retardant PC/ABS alloys are brominated flame retardants, such as brominated epoxy resin, brominated polycarbonate, brominated polystyrene, ten bromo two phenyl ethane, phosphate ester flame retardants. For example, TPP, RDP, BAPP; phosphorus one bromine structural flame retardant, such as phosphoric acid three (2, 4 one or two bromo phenyl ester), the commodity brand is KroitePB--460. Their flame retardant PC/ABS alloys have their own characteristics.
A comparative test of flame retardants used in flame retardant PC/ABS alloys was carried out. The results show that when the mass ratio of PC/ABS to 7:3. The brominated flame retardant flame retardant PC/ABS alloy amount of about l3%, the flame retardant properties of materials can reach UL-94V-0 level (1.6nun); phosphate flame retardant agent due to the retarding effect of ABS is not good, only in the material in the mass fraction of PC is greater than 70%, only flame retardant effect: a phosphate flame retardant with bromine. Even in the material, the content of PC was 50%, also can reach the uL-94V-O level (1.6mm), phosphorus and bromine have synergistic effect in the PC/ABS alloy, the phosphate flame retardant with bromine compound used in flame retardant agent, PC/ABS alloy. It also has a similar effect.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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