News Details
Dicyandiamide crosslinking agent
2017-4-21 15:38:52
Dicyandiamide crosslinking agent, dicyandiamide and cyanide diamine, dicyandiamide, English abbreviated DICY, molecular weight 84, white crystal, melting point.
Dicyandiamide crosslinking agent and epoxy value of 0.12 the theory of bisphenol A type epoxy resin with herself for 100:2.52, actual dosage is 2% 4% commonly, crosslinking conditions for 200? / 30 min.
Dicyandiamide kind of crosslinking agent is the most widely using epoxy powder coating of the crosslinking agent. Produced by calcium cyanide ammonia reaction. Kind of crosslinking agent of DICY dicyandiamide/epoxy resin system still exist the following problems: the insoluble cause heterogeneity of the DICY sexual problems reflected in the low gloss, poor mobility and in individual case after making the crosslinked coating uneven appearance; DICY itself is a water-soluble compound, usually will increase the sensitivity of crosslinked coating for water.
In order to improve its low reaction performance, need to join catalysts or promoters, such as imidazole (or bonus imidazole) to speed up the reaction. Directly to the dicyandiamide with such promoter the resulting mixture is called acceleration dicyandiamide, replace groups, introduced by derivative, the most commonly used for aryl of dicyandiamide, to replace dicyandiamide. Replace dicyandiamide representative varieties is adjacent - methyl benzene 2 guanidine (Ortho - tolyl - biguanide).
Its preparation is by dicyandiamide and condensation in the presence of o-toluidine in hydrochloric acid. Neighbors - cresyl two guanidine melting point of about 136? , the introduction of adjacent cresyl improved and the compatibility of bisphenol A epoxy resin, and it has the very high functionality, so compared with dicyandiamide, the crosslinking performance greatly improved. Recommended by the crosslinking temperature for 160? / 20 min - 180? / 10 min.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Because instead of DICY solubility in the resin is better than DICY itself many, influence the storage stability of system. Therefore, must by selecting the appropriate type and content of catalyst to hope to get the crosslinking time and comprehensive balance the relationship between the storage stability of the acceptable.
Two cyanide diamine (melamine), abbreviated DICY or DCD. Is the dimer of cyanogen amine and guanidine cyano derivatives. The chemical formula C2H4N4. A white crystalline powder. Soluble in water, alcohol, ethylene glycol and dimethyl formamide, hardly soluble in ether and benzene. Stable when dry.
Calcium cyanamide hydrolyzed calcium hydrogen cyanide ammonia slurry, the reduced pressure filtration to remove calcium hydroxide filter residue, to filtrate flux into the carbon dioxide to precipitate calcium in the form of calcium carbonate, get cyanamid fluid. Under the condition of alkali aggregate, then through filtering, cooling crystallization, separation, drying, two melamine.
Produce dicyandiamide when maximum speed of temperature and pH on: 50 ℃ at pH 9.7; 80 ℃ when the pH is 9.1; 100 ℃ at pH 8.8. Controlled polymerization under these conditions, then the cooling crystallization, separation, drying, for a quick finished product dicyandiamide. Industrial dicyandiamide content is 99%, product consumption per ton of lime nitrogen (more than 21% of nitrogen) 4239 kg.
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 4 ~ 12, 100 g epoxy resin composition for 6 ~ 12 months. The shelf life of two cyanide diamine when the dosage of 17 less than two months, when eight quantities of storage life can be up to half the year. Crosslinking conditions or 180 ℃ / 170 ℃ / lh 20 min, thermal deformation temperature of 125 ℃. Also used as a single component of the waterborne epoxy adhesives crosslinking agent. Dosage of reference 7. Two cyanide diamine (5 ~ 6) and hydrazide (3 ~ 4) distribution system, can be 120 ℃ / 45 min cross-linked epoxy resin.
Using dicyandiamide with acid reaction, can make various kinds of guanidine salt. Dicyandiamide and phenyl nitrile reaction of benzene second 3 get together cyanogen amine is paint, laminate, molding powder of intermediates.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Dicyandiamide crosslinking agent and epoxy value of 0.12 the theory of bisphenol A type epoxy resin with herself for 100:2.52, actual dosage is 2% 4% commonly, crosslinking conditions for 200? / 30 min.
Dicyandiamide kind of crosslinking agent is the most widely using epoxy powder coating of the crosslinking agent. Produced by calcium cyanide ammonia reaction. Kind of crosslinking agent of DICY dicyandiamide/epoxy resin system still exist the following problems: the insoluble cause heterogeneity of the DICY sexual problems reflected in the low gloss, poor mobility and in individual case after making the crosslinked coating uneven appearance; DICY itself is a water-soluble compound, usually will increase the sensitivity of crosslinked coating for water.
In order to improve its low reaction performance, need to join catalysts or promoters, such as imidazole (or bonus imidazole) to speed up the reaction. Directly to the dicyandiamide with such promoter the resulting mixture is called acceleration dicyandiamide, replace groups, introduced by derivative, the most commonly used for aryl of dicyandiamide, to replace dicyandiamide. Replace dicyandiamide representative varieties is adjacent - methyl benzene 2 guanidine (Ortho - tolyl - biguanide).
Its preparation is by dicyandiamide and condensation in the presence of o-toluidine in hydrochloric acid. Neighbors - cresyl two guanidine melting point of about 136? , the introduction of adjacent cresyl improved and the compatibility of bisphenol A epoxy resin, and it has the very high functionality, so compared with dicyandiamide, the crosslinking performance greatly improved. Recommended by the crosslinking temperature for 160? / 20 min - 180? / 10 min.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Because instead of DICY solubility in the resin is better than DICY itself many, influence the storage stability of system. Therefore, must by selecting the appropriate type and content of catalyst to hope to get the crosslinking time and comprehensive balance the relationship between the storage stability of the acceptable.
Two cyanide diamine (melamine), abbreviated DICY or DCD. Is the dimer of cyanogen amine and guanidine cyano derivatives. The chemical formula C2H4N4. A white crystalline powder. Soluble in water, alcohol, ethylene glycol and dimethyl formamide, hardly soluble in ether and benzene. Stable when dry.
Calcium cyanamide hydrolyzed calcium hydrogen cyanide ammonia slurry, the reduced pressure filtration to remove calcium hydroxide filter residue, to filtrate flux into the carbon dioxide to precipitate calcium in the form of calcium carbonate, get cyanamid fluid. Under the condition of alkali aggregate, then through filtering, cooling crystallization, separation, drying, two melamine.
Produce dicyandiamide when maximum speed of temperature and pH on: 50 ℃ at pH 9.7; 80 ℃ when the pH is 9.1; 100 ℃ at pH 8.8. Controlled polymerization under these conditions, then the cooling crystallization, separation, drying, for a quick finished product dicyandiamide. Industrial dicyandiamide content is 99%, product consumption per ton of lime nitrogen (more than 21% of nitrogen) 4239 kg.
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 4 ~ 12, 100 g epoxy resin composition for 6 ~ 12 months. The shelf life of two cyanide diamine when the dosage of 17 less than two months, when eight quantities of storage life can be up to half the year. Crosslinking conditions or 180 ℃ / 170 ℃ / lh 20 min, thermal deformation temperature of 125 ℃. Also used as a single component of the waterborne epoxy adhesives crosslinking agent. Dosage of reference 7. Two cyanide diamine (5 ~ 6) and hydrazide (3 ~ 4) distribution system, can be 120 ℃ / 45 min cross-linked epoxy resin.
Using dicyandiamide with acid reaction, can make various kinds of guanidine salt. Dicyandiamide and phenyl nitrile reaction of benzene second 3 get together cyanogen amine is paint, laminate, molding powder of intermediates.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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