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Three factors of intumescent flame retardant of epoxy resin
2017-11-17 11:49:01
Three factors of intumescent flame retardant of epoxy resin
Only when the three factors (acid source, carbon source and gas source) exist in proper proportion, the intumescent flame retardant of epoxy resin can have better expansion effect and flame retardant property. The residual weight (charring property) of intumescent flame retardant of epoxy resin can be regarded as one of the indexes of its flame retardant performance.
Epoxy resin intumescent flame retardant three elements 1. acid source: generally refers to inorganic acids burning acid, such as phosphoric acid, sulfuric acid, boric acid and phosphate ester, etc.
Epoxy resin intumescent flame retardant three elements 2. carbon source: carbon containing polyol compounds, such as pentaerythritol, ethylene glycol, phenolic resin and so on
Epoxy resin intumescent flame retardant three elements 3. foaming source: generally refers to nitrogen containing multi carbon compounds, such as urea, dicyandiamide, polyamide and so on. Under heating or flame action, the acid source, carbon source and gas source react rapidly with chemical reaction to form a long and short carbon barrier with heat insulation and oxygen barrier. The latter can organize flame propagation. The substrate is free from further degradation and combustion, resulting in better flame retardancy. However, there are some shortcomings, such as large hygroscopicity, low initial decomposition temperature, poor dispersibility and poor compatibility of plastics.
The flame retardancy of the second series is better than that of the first and third series, indicating that phosphorus content is increased and flame retardancy is enhanced in a certain range. But the phosphorus content increases, and the hygroscopicity of flame retardant is also increased, so the composition of experiment II and 1 is better.
Effect of intumescent flame retardant of epoxy resin on flame retardancy of epoxy resin. With the increase of the amount of epoxy intumescent flame retardant, the OI of EP increased greatly, and when the amount of intumescent flame retardant increased to 40%, the OI reached 27.3%. OI growth rate is slow and fast, and the amount of epoxy intumescent flame retardant is 20%, the OI growth rate tends to be gentle.
The reason is that the microencapsulated red phosphorus flame retardant epoxy resin can be decomposed into uniform prior to the EP layer of a layer of porous carbon covered on its surface, which plays a role of flame retardant epoxy resin, but the thermal expansion type flame retardant their release will lead to long burning time, to further improve the fire resistance effect. The amount of epoxy intumescent flame retardant has a great influence on the mechanical properties of the material in a certain range.
With the increase of its dosage, the fracture strength and elongation at break decreased sharply. When the amount of intumescent flame retardant increased from 0 to 10%, the fracture strength of the material decreased from 32.40MPa to 26.88MPa, and the elongation at break decreased from 9.94% to 8.46%. This is because the epoxy intumescent flame retardant is less compatible with the EP system.
Taking into account the influence of the amount of Intumescent Flame Retardant on the flame retardancy and mechanical properties of EP, it was found that when the amount of intumescent flame retardant was 30%, the OI reached 26.3%, and the mechanical properties of EP system were relatively small
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.
Epoxy intumescent flame retardant (IFR) is an environmentally friendly green flame retardant. It does not contain halogen and does not use antimony oxide as a synergistic agent. Its system itself has synergistic effect. Epoxy resin containing intumescent flame retardant plastics in the combustion surface will generate carbon foam layer to heat and oxygen, smoke suppression, anti drip effect, has excellent flame retardant performance, and low smoke, low toxic and non corrosive gases, in line with the future direction of the research and development of flame retardant, has at home and abroad to become one of the most active research field of flame retardant.
Epoxy intumescent flame retardant (IFR) is a kind of nitrogen and phosphorus as the main component of the composite flame retardant, it does not contain halogen, antimony oxide is not used as synergistic agent, this kind of flame retardant in heated foaming, called intumescent flame retardant epoxy resin, it is environmentally friendly flame retardant a kind of high efficiency and low toxicity. Since 1990s, the intumescent flame retardant of epoxy resin has gradually become active. It has been recognized as one of the effective ways to realize halogen-free flame retardants, and it has great potential in flame retardant finishing of textiles.
The flame retardant effect of epoxy intumescent flame retardant mainly depends on the formation of porous foam coke layer on the surface of the material. It is a multiphase system containing solid, liquid and gaseous products. The flame retardancy of carbon layer is mainly manifested in the difficulty of penetrating the condensed phase by heat, preventing oxygen from entering the combustion zone, and preventing the degradation of gaseous or liquid products from spilling over the surface of the material.
Coke layer formation process: at about 150 DEG C, the source can produce acid esterified polyol and can be used as a dehydrating agent for acid; at a slightly higher temperature, esterification of acid and carbon source, and the system of the amine as catalyst, esterification reaction is accelerated; system in esterification and esterification before in the process of melting, generated during the reaction process of non flammable gas has a molten state foaming system expansion, at the same time, polyol ester dehydration and carbonization, the formation of inorganic compounds and carbon residue, the reaction system further foaming; close to finish, and finally form a gel curing system, porous carbon foam layer.
Application of intumescent flame retardant epoxy resin on the fiber and fabric mainly through two ways, one is the preparation of flame retardant finishing liquid, etc. by coating finishing to the surface of the fabric, natural fiber mostly by this method; two is the intumescent flame retardant epoxy resin as a co polymer monomer into polymer, mostly used for flame retardant synthetic fiber.
The synthesis of an intumescent flame retardant of epoxy resin with acid source, carbon source and gas source is a hot topic in the field of flame retardant research. In addition, improving the thermal stability of epoxy intumescent flame retardant, meeting the needs of high temperature processing of polymers, is also the future development direction of intumescent flame retardant of epoxy resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Only when the three factors (acid source, carbon source and gas source) exist in proper proportion, the intumescent flame retardant of epoxy resin can have better expansion effect and flame retardant property. The residual weight (charring property) of intumescent flame retardant of epoxy resin can be regarded as one of the indexes of its flame retardant performance.
Epoxy resin intumescent flame retardant three elements 1. acid source: generally refers to inorganic acids burning acid, such as phosphoric acid, sulfuric acid, boric acid and phosphate ester, etc.
Epoxy resin intumescent flame retardant three elements 2. carbon source: carbon containing polyol compounds, such as pentaerythritol, ethylene glycol, phenolic resin and so on
Epoxy resin intumescent flame retardant three elements 3. foaming source: generally refers to nitrogen containing multi carbon compounds, such as urea, dicyandiamide, polyamide and so on. Under heating or flame action, the acid source, carbon source and gas source react rapidly with chemical reaction to form a long and short carbon barrier with heat insulation and oxygen barrier. The latter can organize flame propagation. The substrate is free from further degradation and combustion, resulting in better flame retardancy. However, there are some shortcomings, such as large hygroscopicity, low initial decomposition temperature, poor dispersibility and poor compatibility of plastics.
The flame retardancy of the second series is better than that of the first and third series, indicating that phosphorus content is increased and flame retardancy is enhanced in a certain range. But the phosphorus content increases, and the hygroscopicity of flame retardant is also increased, so the composition of experiment II and 1 is better.
Effect of intumescent flame retardant of epoxy resin on flame retardancy of epoxy resin. With the increase of the amount of epoxy intumescent flame retardant, the OI of EP increased greatly, and when the amount of intumescent flame retardant increased to 40%, the OI reached 27.3%. OI growth rate is slow and fast, and the amount of epoxy intumescent flame retardant is 20%, the OI growth rate tends to be gentle.
The reason is that the microencapsulated red phosphorus flame retardant epoxy resin can be decomposed into uniform prior to the EP layer of a layer of porous carbon covered on its surface, which plays a role of flame retardant epoxy resin, but the thermal expansion type flame retardant their release will lead to long burning time, to further improve the fire resistance effect. The amount of epoxy intumescent flame retardant has a great influence on the mechanical properties of the material in a certain range.
With the increase of its dosage, the fracture strength and elongation at break decreased sharply. When the amount of intumescent flame retardant increased from 0 to 10%, the fracture strength of the material decreased from 32.40MPa to 26.88MPa, and the elongation at break decreased from 9.94% to 8.46%. This is because the epoxy intumescent flame retardant is less compatible with the EP system.
Taking into account the influence of the amount of Intumescent Flame Retardant on the flame retardancy and mechanical properties of EP, it was found that when the amount of intumescent flame retardant was 30%, the OI reached 26.3%, and the mechanical properties of EP system were relatively small
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.
Epoxy intumescent flame retardant (IFR) is an environmentally friendly green flame retardant. It does not contain halogen and does not use antimony oxide as a synergistic agent. Its system itself has synergistic effect. Epoxy resin containing intumescent flame retardant plastics in the combustion surface will generate carbon foam layer to heat and oxygen, smoke suppression, anti drip effect, has excellent flame retardant performance, and low smoke, low toxic and non corrosive gases, in line with the future direction of the research and development of flame retardant, has at home and abroad to become one of the most active research field of flame retardant.
Epoxy intumescent flame retardant (IFR) is a kind of nitrogen and phosphorus as the main component of the composite flame retardant, it does not contain halogen, antimony oxide is not used as synergistic agent, this kind of flame retardant in heated foaming, called intumescent flame retardant epoxy resin, it is environmentally friendly flame retardant a kind of high efficiency and low toxicity. Since 1990s, the intumescent flame retardant of epoxy resin has gradually become active. It has been recognized as one of the effective ways to realize halogen-free flame retardants, and it has great potential in flame retardant finishing of textiles.
The flame retardant effect of epoxy intumescent flame retardant mainly depends on the formation of porous foam coke layer on the surface of the material. It is a multiphase system containing solid, liquid and gaseous products. The flame retardancy of carbon layer is mainly manifested in the difficulty of penetrating the condensed phase by heat, preventing oxygen from entering the combustion zone, and preventing the degradation of gaseous or liquid products from spilling over the surface of the material.
Coke layer formation process: at about 150 DEG C, the source can produce acid esterified polyol and can be used as a dehydrating agent for acid; at a slightly higher temperature, esterification of acid and carbon source, and the system of the amine as catalyst, esterification reaction is accelerated; system in esterification and esterification before in the process of melting, generated during the reaction process of non flammable gas has a molten state foaming system expansion, at the same time, polyol ester dehydration and carbonization, the formation of inorganic compounds and carbon residue, the reaction system further foaming; close to finish, and finally form a gel curing system, porous carbon foam layer.
Application of intumescent flame retardant epoxy resin on the fiber and fabric mainly through two ways, one is the preparation of flame retardant finishing liquid, etc. by coating finishing to the surface of the fabric, natural fiber mostly by this method; two is the intumescent flame retardant epoxy resin as a co polymer monomer into polymer, mostly used for flame retardant synthetic fiber.
The synthesis of an intumescent flame retardant of epoxy resin with acid source, carbon source and gas source is a hot topic in the field of flame retardant research. In addition, improving the thermal stability of epoxy intumescent flame retardant, meeting the needs of high temperature processing of polymers, is also the future development direction of intumescent flame retardant of epoxy resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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