News Details
Instead of the dicyanide coating crosslinking agent
2017-5-5 10:57:03
Instead of the dicyanide coating crosslinking agent,The representative variety of the replacement of the cyanamide is ortho-tolyl-biguanide.
The preparation was obtained through the presence of both cyanamide and ortho-methylaniline in hydrochloric acid. Neighbors - cresyl two guanidine has about 136 ℃, melting point introduction of adjacent cresyl was improved and the compatibility of bisphenol A epoxy resin, and it has the very high functionality, so compared with dicyandiamide crosslinking performance is greatly improved, recommended by the crosslinking temperature is 160 ℃ / 20-180 ℃ for 10 minutes. But in order to further lower the crosslinking temperature, it is best to keep it in the same way as 2-methyl-imidazole. Its chemical equivalent approximately 37, the recommended dosage of resin per hundred of E - 12 meter about 4 to 5, if further add 0.1-0.3-2 - methyl imidazole, can make the crosslinking temperature below 140 ℃.
With adjacent - methyl benzene guanidine (OTB) preparation of pure epoxy system has excellent resistance to yellowing, flexibility and electrical insulating properties, so the coating system is recommended for decorative purposes and some corrosion such as spring and other electrical insulating powder.
The cyanamide, also known as dicyanide, was long used as an agent for latent sex. Apply to powder coating, adhesive and so on. A mixture of cyanamide and epoxy resin can be stored at room temperature for up to six months.
The crosslinking mechanism of cyanamide is more complex, and besides the four hydrogens on the cyanide, the cyanide also has certain reactive activity. Dicyandiamide alone when used as a crosslinking agent of epoxy resin crosslinking temperature is very high, generally between 150 ~ 150 ℃, the temperature of many devices and materials due to the temperature of cannot bear such cannot be used, or because the requirements of production process and must reduce one-component epoxy cross-linking temperature.
There are two ways to solve the problem, one is to join the promoter, without too much damage to the storage period of dicyandiamide and under the premise of using performance, lower the crosslinking temperature.
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.
Such a lot of accelerator, imidazoles main compounds and their derivatives and salt, urea derivative, organic guanidine derivatives, phosphorus compounds, transition metal complexes and compound accelerator, etc., the accelerator can make dicyandiamide crosslinking temperature decrease, the ideal crosslinking temperature can drop to about 120 ℃, but at the same time can make the storage period shorten, and will be affected by a certain water resistance.
Another effective way to reduce the temperature of single component epoxy resins is by chemical modification of the dicyanide by means of molecular design. Introduction of amine in the dicyandiamide molecules, especially the structure of aromatic amine, in the preparation of dicyandiamide derivative, such as Switzerland Ciba Geigy company development of HT 2833, HT 2844 is a 3, 5 two to replace aniline modified dicyandiamide derivative, its chemical formula is as follows:
According to the report, the crosslinking agent has good intermiscibility with epoxy resin, long storage period, crosslinking speed, crosslinking 1 h under 100 ℃, the shear strength can be up to 25 mpa, 150 ℃ crosslinking 30 min, shear strength can be up to 27 mpa. Using aromatic diamine as 4, 4 'diamino diphenyl methane (DDM), 4, 4' diamino diphenyl ether (DDE), 4, 4 'diamino diphenyl sulfone (DDS), the dimethyl aniline reaction with dicyandiamide (DMB) respectively made its derivatives. After the introduction of benzene ring of dicyandiamide derivative with the intermiscibility of bisphenol A type epoxy resin with dicyandiamide increased significantly, compared with 44 E one-component system consisting of epoxy resin at room temperature storage period for half A year, crosslinking temperature were lower than that of dicyandiamide.
Dicyandiamide MD 02, the melting point of 154 ~ 162 ℃, melting point than dicyandiamide (207 ~ 210 ℃) low about 45 ℃, using 100 E 44 epoxy resin, 15 MD 02 and 0 5 2 methyl imidazole of formula, the gel time under 150 ℃ for 4 min. Using aniline and formaldehyde of the modified dicyandiamide derivative with bisphenol A type epoxy resin mixed solubility increases, in A mixture of acetone and alcohol solution has good solubility, and increase the reactivity, storage is longer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The preparation was obtained through the presence of both cyanamide and ortho-methylaniline in hydrochloric acid. Neighbors - cresyl two guanidine has about 136 ℃, melting point introduction of adjacent cresyl was improved and the compatibility of bisphenol A epoxy resin, and it has the very high functionality, so compared with dicyandiamide crosslinking performance is greatly improved, recommended by the crosslinking temperature is 160 ℃ / 20-180 ℃ for 10 minutes. But in order to further lower the crosslinking temperature, it is best to keep it in the same way as 2-methyl-imidazole. Its chemical equivalent approximately 37, the recommended dosage of resin per hundred of E - 12 meter about 4 to 5, if further add 0.1-0.3-2 - methyl imidazole, can make the crosslinking temperature below 140 ℃.
With adjacent - methyl benzene guanidine (OTB) preparation of pure epoxy system has excellent resistance to yellowing, flexibility and electrical insulating properties, so the coating system is recommended for decorative purposes and some corrosion such as spring and other electrical insulating powder.
The cyanamide, also known as dicyanide, was long used as an agent for latent sex. Apply to powder coating, adhesive and so on. A mixture of cyanamide and epoxy resin can be stored at room temperature for up to six months.
The crosslinking mechanism of cyanamide is more complex, and besides the four hydrogens on the cyanide, the cyanide also has certain reactive activity. Dicyandiamide alone when used as a crosslinking agent of epoxy resin crosslinking temperature is very high, generally between 150 ~ 150 ℃, the temperature of many devices and materials due to the temperature of cannot bear such cannot be used, or because the requirements of production process and must reduce one-component epoxy cross-linking temperature.
There are two ways to solve the problem, one is to join the promoter, without too much damage to the storage period of dicyandiamide and under the premise of using performance, lower the crosslinking temperature.
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.
Such a lot of accelerator, imidazoles main compounds and their derivatives and salt, urea derivative, organic guanidine derivatives, phosphorus compounds, transition metal complexes and compound accelerator, etc., the accelerator can make dicyandiamide crosslinking temperature decrease, the ideal crosslinking temperature can drop to about 120 ℃, but at the same time can make the storage period shorten, and will be affected by a certain water resistance.
Another effective way to reduce the temperature of single component epoxy resins is by chemical modification of the dicyanide by means of molecular design. Introduction of amine in the dicyandiamide molecules, especially the structure of aromatic amine, in the preparation of dicyandiamide derivative, such as Switzerland Ciba Geigy company development of HT 2833, HT 2844 is a 3, 5 two to replace aniline modified dicyandiamide derivative, its chemical formula is as follows:
According to the report, the crosslinking agent has good intermiscibility with epoxy resin, long storage period, crosslinking speed, crosslinking 1 h under 100 ℃, the shear strength can be up to 25 mpa, 150 ℃ crosslinking 30 min, shear strength can be up to 27 mpa. Using aromatic diamine as 4, 4 'diamino diphenyl methane (DDM), 4, 4' diamino diphenyl ether (DDE), 4, 4 'diamino diphenyl sulfone (DDS), the dimethyl aniline reaction with dicyandiamide (DMB) respectively made its derivatives. After the introduction of benzene ring of dicyandiamide derivative with the intermiscibility of bisphenol A type epoxy resin with dicyandiamide increased significantly, compared with 44 E one-component system consisting of epoxy resin at room temperature storage period for half A year, crosslinking temperature were lower than that of dicyandiamide.
Dicyandiamide MD 02, the melting point of 154 ~ 162 ℃, melting point than dicyandiamide (207 ~ 210 ℃) low about 45 ℃, using 100 E 44 epoxy resin, 15 MD 02 and 0 5 2 methyl imidazole of formula, the gel time under 150 ℃ for 4 min. Using aniline and formaldehyde of the modified dicyandiamide derivative with bisphenol A type epoxy resin mixed solubility increases, in A mixture of acetone and alcohol solution has good solubility, and increase the reactivity, storage is longer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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