News Details
The latent coating crosslinking agent for heating
2017-7-18 12:29:19
The latent coating crosslinking agent for heating
It is stable at room temperature and is mostly solid, not soluble in epoxy resin, and then melts and decomposes in the vicinity of its melting point and reacts with epoxy resin.
The most representative of the most representative of the reheated insidious agents are dicyandiamide, organohydrazide compounds, trifluoride boron 2 amine complexes and imidazolide compounds.
A compound of dicyandiamide that is used to heat a living agent. Dicyandiamide is a kind of application earlier, broader latent sexual intercourse, easy to crystallization, melting point of 207 ~ 209 ℃. It is often used in powder dispersion in epoxy resin. It is stable at normal temperature and can be placed for more than six months. At about 180 ℃ and 20 ~ 60 min is a deeper degree of crosslinking effect.
In recent years, in order to reduce the crosslinking temperature, we have added the derivatives of urea, imidazole and its derivatives, quaternary salt, quaternary ammonium salt, tertiary amine, and hydrazide, etc., in the mixed system. For example, urea derivatives can be decomposed into isocyanate and dimethylamine after being heated, which further reacts to the production of tertiary amine, which are then cross-linked with the reaction of epoxy resin respectively.
Crosslinking temperature can be reduced to about 130 ℃, but its storage period shorten, water resistance and lower crosslinking. In order to overcome the influence of many polar groups formed by the crosslinking process, there are many reports on chemical modification and modification of melamine.
By using aromatic amine react with cyano and modified HardenerHT2833 crosslinking agent, not only to improve crosslinking product has good resistance to water, but also for its in the dispersion of epoxy resin, heat resistance and crosslinking material performance are improved. The N2 alkyl cyanide derivatives were produced by the active hydrogen and epoxyl group on the nitrogen atoms in the molecule and further crosslinking, which improved the crosslinking speed and extended the storage period.
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
It is stable at room temperature and is mostly solid, not soluble in epoxy resin, and then melts and decomposes in the vicinity of its melting point and reacts with epoxy resin.
The most representative of the most representative of the reheated insidious agents are dicyandiamide, organohydrazide compounds, trifluoride boron 2 amine complexes and imidazolide compounds.
A compound of dicyandiamide that is used to heat a living agent. Dicyandiamide is a kind of application earlier, broader latent sexual intercourse, easy to crystallization, melting point of 207 ~ 209 ℃. It is often used in powder dispersion in epoxy resin. It is stable at normal temperature and can be placed for more than six months. At about 180 ℃ and 20 ~ 60 min is a deeper degree of crosslinking effect.
In recent years, in order to reduce the crosslinking temperature, we have added the derivatives of urea, imidazole and its derivatives, quaternary salt, quaternary ammonium salt, tertiary amine, and hydrazide, etc., in the mixed system. For example, urea derivatives can be decomposed into isocyanate and dimethylamine after being heated, which further reacts to the production of tertiary amine, which are then cross-linked with the reaction of epoxy resin respectively.
Crosslinking temperature can be reduced to about 130 ℃, but its storage period shorten, water resistance and lower crosslinking. In order to overcome the influence of many polar groups formed by the crosslinking process, there are many reports on chemical modification and modification of melamine.
By using aromatic amine react with cyano and modified HardenerHT2833 crosslinking agent, not only to improve crosslinking product has good resistance to water, but also for its in the dispersion of epoxy resin, heat resistance and crosslinking material performance are improved. The N2 alkyl cyanide derivatives were produced by the active hydrogen and epoxyl group on the nitrogen atoms in the molecule and further crosslinking, which improved the crosslinking speed and extended the storage period.
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
Dicyandiamide modified by epoxy propane MD202 crosslinking agent was prepared, its melting point to 154 ~ 160 ℃, 150 ℃ about 4 min can make epoxy crosslinking.
Organoyl hydrazide compounds are similar to dicyandiamide, and they are also a kind of latent sexual agent which is dispersed in epoxy resin in powder form and can be used for 4 ~ may. The general system is made by direct reaction of fatty acid ester and hydrazine hydrazine. It is commonly used to have succinate, hexamic acid hydrazine, phthalate, salicylate and so on.
Crosslinking temperature of this kind of crosslinking agent is usually high, usually at about 160 ℃, its decomposition temperature when in use, also need to join and dicyandiamide basic same crosslinking promoter to lower the crosslinking temperature.
Convert dihydric phenol to synthesize organic hydrazide compounds, not only can greatly reduce the crosslinking temperature of epoxy resin, and crosslinked fast, good storage, crosslinking product water resistance and toughness have improved, but also has certain transparency.
The effects of hydrophilic components can theoretically be considered as hydrophilic components with hydrophilic or hydrophilic groups as a hydrophilic component to modify polyisocyanate.
The modified HDI trimer was modified by using two surfactants, op-10 and AEO3, which met the above conditions, and the modified results were compared with the HDI trimer modified by PEGMM.
The results showed that the modified HDI trimers of the opt-10 and AEO3 surfactants were not good. This may be due to the choice of two non-ionic surfactants, although they are more hydrophilic, but they are also more oil-friendly. Relatively speaking, PEGMM is much weaker, so the modified effect is good. The influence of the average relative molecular weight of PEGMM on the hydrophilic properties of the modified HDI polyisocyanate was influenced by the average molecular weight of PEGMM.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Dicyandiamide modified by epoxy propane MD202 crosslinking agent was prepared, its melting point to 154 ~ 160 ℃, 150 ℃ about 4 min can make epoxy crosslinking.
Organoyl hydrazide compounds are similar to dicyandiamide, and they are also a kind of latent sexual agent which is dispersed in epoxy resin in powder form and can be used for 4 ~ may. The general system is made by direct reaction of fatty acid ester and hydrazine hydrazine. It is commonly used to have succinate, hexamic acid hydrazine, phthalate, salicylate and so on.
Crosslinking temperature of this kind of crosslinking agent is usually high, usually at about 160 ℃, its decomposition temperature when in use, also need to join and dicyandiamide basic same crosslinking promoter to lower the crosslinking temperature.
Convert dihydric phenol to synthesize organic hydrazide compounds, not only can greatly reduce the crosslinking temperature of epoxy resin, and crosslinked fast, good storage, crosslinking product water resistance and toughness have improved, but also has certain transparency.
The effects of hydrophilic components can theoretically be considered as hydrophilic components with hydrophilic or hydrophilic groups as a hydrophilic component to modify polyisocyanate.
The modified HDI trimer was modified by using two surfactants, op-10 and AEO3, which met the above conditions, and the modified results were compared with the HDI trimer modified by PEGMM.
The results showed that the modified HDI trimers of the opt-10 and AEO3 surfactants were not good. This may be due to the choice of two non-ionic surfactants, although they are more hydrophilic, but they are also more oil-friendly. Relatively speaking, PEGMM is much weaker, so the modified effect is good. The influence of the average relative molecular weight of PEGMM on the hydrophilic properties of the modified HDI polyisocyanate was influenced by the average molecular weight of PEGMM.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian