News Details
The coating is used to crosslinking agent with melamine
2017-5-4 11:51:52
The coating is used to crosslinking agent with melamine. Dicyandiamide is one kind has high melting point (207-209 ℃) and contains passivation group - CN compounds, and the reaction of epoxy resin in st13 of at least 150 ℃ can occur. So in order to improve its low response performance, you need to accelerate the reaction by adding a catalyst or promoter such as imidazole or addition to imidazole.
Directly to the dicyandiamide with such promoter the resulting mixture is called acceleration dicyandiamide, and by introducing replaced derivative groups of dicyandiamide, to replace dicyandiamide.
Dicyanide, or DICY or DCD. It's the dimer of the cyanamide, which is also a cyanogen derivative of guanidine. The chemical formula C2H4N4. White crystal powder. Soluble in water, alcohol, ethylene glycol and dimethylformamide, which are almost insoluble in ether and benzene. It is stable when it is dry.
Cyanamine character: white crystalline powder. Water solubility at 13 ℃ is 2.26%, larger solubility in hot water. When aqueous solution at 80 ℃ was gradually ammonia decomposition. Anhydrous ethanol (C2H5OH), the solubility in ether at 13 ℃, 1.26% and 0.01%, respectively. Soluble in liquid ammonia, hot water, ethanol, acetone hydrate, dimethyl formamide, which is not soluble in ethyl ether, and is not soluble in benzene and chloroform. Relative density (d254) 1.40. The melting temperature of 209.5 ℃. Dry time is stable. Don't burn. Low toxicity, half of the lethal (mice, transudially) > 4000mg/kg. The maximum allowable concentration in the air is 5mg/m cubed.
Used as type latent epoxy resin adhesives crosslinking agent, preparation, one-component epoxy adhesives only when two cyanide diamine granularity of 5 microns or less (2500 mesh), can be formed in epoxy resin slurry, won't produce precipitation. Reference dosage is 4 ~ 12, 100g epoxy resin will be used for 6 ~ 12 months. The amount of the dicyanide is less than two months in 17 portions, and it can be stored for up to six months. Crosslinking conditions or 180 ℃ / 170 ℃ / lh 20 min, thermal deformation temperature of 125 ℃. It is also used as a crosslinking agent for single component water based epoxy adhesive. Use 7 servings. Two cyanide diamine (5 ~ 6) and hydrazide (3 ~ 4) distribution system, can be 120 ℃ / 45 min cross-linked epoxy resin.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Current fluid control agents are polyacrylate or copolymer, while some acrylic - silicone and pure silicone are considered "dangerous". To be highly active in the early days of the test or is incompatible silicone (such as poly (methyl) silane) have led to the pollution of the whole factory, so people have to use silicon resin is a kind of resistance. However, we have to admit that, there are still some modified polysiloxane (such as polyester and polyether modified polysiloxane) under the condition of without pollution to improve the flowing property of powder coatings.
This kind of silicone is usually used in varnish. Recent research on polyester modified methyl alkyl siloxane show that with this kind of silicone resin powder coating can be reduced to very low surface tension (even with only 0.1% of the basic material), and can provide good liquidity. When silicon resin contains short alkyl side chains, the reduction of surface tension is more apparent. For all poly acrylic resin, people in general use, high molecular weight poly (n-butyl acrylate, and already 2 - ethyl acrylate ester and other copolymerization monomer of the copolymer, is also very important.
General flow control agent is sticky liquid, so they are normally in the concentration of 5% to 15% of disposable added to the resin binders, or to the concentration of 60% to 70% by precipitation to the gas phase silica into masterbatch. This makes it easier to measure, and is easily dispersed in the mix and phase of powder coatings. Because silicon dioxide is easy to cause fog shadow on varnish, so when the transparency requirement of lacquer is high, should choose the resin mother material.
Fluorocarbon is also used as a fluid control agent for powder coatings, and they have less than silane. But the compound is not widely used, because the high cost of fluorocarbon compounds and high organic solvents are not made into powdery mother material. Fluorocarbon compounds are one of the biggest advantage is good painting, it is some difficult to deal with oil base material or polluted metal base material such as the only effective flow ping agent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Directly to the dicyandiamide with such promoter the resulting mixture is called acceleration dicyandiamide, and by introducing replaced derivative groups of dicyandiamide, to replace dicyandiamide.
Dicyanide, or DICY or DCD. It's the dimer of the cyanamide, which is also a cyanogen derivative of guanidine. The chemical formula C2H4N4. White crystal powder. Soluble in water, alcohol, ethylene glycol and dimethylformamide, which are almost insoluble in ether and benzene. It is stable when it is dry.
Cyanamine character: white crystalline powder. Water solubility at 13 ℃ is 2.26%, larger solubility in hot water. When aqueous solution at 80 ℃ was gradually ammonia decomposition. Anhydrous ethanol (C2H5OH), the solubility in ether at 13 ℃, 1.26% and 0.01%, respectively. Soluble in liquid ammonia, hot water, ethanol, acetone hydrate, dimethyl formamide, which is not soluble in ethyl ether, and is not soluble in benzene and chloroform. Relative density (d254) 1.40. The melting temperature of 209.5 ℃. Dry time is stable. Don't burn. Low toxicity, half of the lethal (mice, transudially) > 4000mg/kg. The maximum allowable concentration in the air is 5mg/m cubed.
Used as type latent epoxy resin adhesives crosslinking agent, preparation, one-component epoxy adhesives only when two cyanide diamine granularity of 5 microns or less (2500 mesh), can be formed in epoxy resin slurry, won't produce precipitation. Reference dosage is 4 ~ 12, 100g epoxy resin will be used for 6 ~ 12 months. The amount of the dicyanide is less than two months in 17 portions, and it can be stored for up to six months. Crosslinking conditions or 180 ℃ / 170 ℃ / lh 20 min, thermal deformation temperature of 125 ℃. It is also used as a crosslinking agent for single component water based epoxy adhesive. Use 7 servings. Two cyanide diamine (5 ~ 6) and hydrazide (3 ~ 4) distribution system, can be 120 ℃ / 45 min cross-linked epoxy resin.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Current fluid control agents are polyacrylate or copolymer, while some acrylic - silicone and pure silicone are considered "dangerous". To be highly active in the early days of the test or is incompatible silicone (such as poly (methyl) silane) have led to the pollution of the whole factory, so people have to use silicon resin is a kind of resistance. However, we have to admit that, there are still some modified polysiloxane (such as polyester and polyether modified polysiloxane) under the condition of without pollution to improve the flowing property of powder coatings.
This kind of silicone is usually used in varnish. Recent research on polyester modified methyl alkyl siloxane show that with this kind of silicone resin powder coating can be reduced to very low surface tension (even with only 0.1% of the basic material), and can provide good liquidity. When silicon resin contains short alkyl side chains, the reduction of surface tension is more apparent. For all poly acrylic resin, people in general use, high molecular weight poly (n-butyl acrylate, and already 2 - ethyl acrylate ester and other copolymerization monomer of the copolymer, is also very important.
General flow control agent is sticky liquid, so they are normally in the concentration of 5% to 15% of disposable added to the resin binders, or to the concentration of 60% to 70% by precipitation to the gas phase silica into masterbatch. This makes it easier to measure, and is easily dispersed in the mix and phase of powder coatings. Because silicon dioxide is easy to cause fog shadow on varnish, so when the transparency requirement of lacquer is high, should choose the resin mother material.
Fluorocarbon is also used as a fluid control agent for powder coatings, and they have less than silane. But the compound is not widely used, because the high cost of fluorocarbon compounds and high organic solvents are not made into powdery mother material. Fluorocarbon compounds are one of the biggest advantage is good painting, it is some difficult to deal with oil base material or polluted metal base material such as the only effective flow ping agent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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