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Epoxy resin is commonly used for crosslinking agent
2017-8-23 11:18:41
Epoxy resin is commonly used for crosslinking agent
The effect of epoxy resin on the properties of epoxy coatings is introduced.
Epoxy resin is crosslinked by crosslinking agent. There are many kinds of crosslinking agents commonly used in epoxy resins, with dozens of them. The most common cross-linking agents of epoxy resins are various amine (such as adipolamine, lipocycline) and resin crosslinking agents.
The mechanical properties of coatings caused by crosslinking agents are mainly due to coating hardness, gel time and film drying time. The comprehensive performance of nx-2040 is best, with longer operating period and faster drying time, and the coating hardness is moderate. The differences in the chemical properties of coatings caused by crosslinking agents are mainly oil resistance, oil-water mixture, acid resistance and solvent resistance.
The solvents of acid and acetone were poor in the epoxy resins. The subaqueous epoxy resin, which contains water molecules in its molecular structure, has poor water resistance and salt tolerance. Similarly, the chemical resistance of nx-2040 crosslinking agent is excellent.
Epoxy resin is a kind of synthetic resin that contains two or more epoxies in the molecular structure and can be crosslinked. Epoxide group is made up of one atom of oxygen and two carbon atoms rings, highly active, enables epoxy resin with various types of crosslinking agent to produce crosslinking reaction, formation of two-dimensional reticular structure of the polymer.
The properties of epoxy resin have important relationship with molecular weight: low molecular weight epoxy resin has high hardness, large brittleness and low impact strength. Strong adhesion of linear epoxy resin, poor water resistance and more volatile coatings; The medium molecular weight epoxy resin hardness and flexibility moderate.
The softening point is the softening temperature of epoxy resin measured under the specified conditions, which can represent the molecular weight of epoxy resin. The low molecular weight of the softening point is high. Low molecular weight epoxy resin softening point < 50 ℃, polymerization degree < 2; Medium molecular weight of epoxy resin softening point in 50 ~ 95 ℃, the degree of polymerization of 2 ~ 5; High molecular weight of epoxy resin softening point > 100 ℃, polymerization degree > 5.
The coating material used in solvent or solventless epoxy self-leveling floor coatings is usually used in low-viscosity bisphenol A epoxy resin, bisphenol F type epoxy resin and adipose epoxy resin. Bisphenol A type epoxy resin, bisphenol F type epoxy resin with coupling agent and clinch A deal after cross-linking cross-linking of film containing hydroxyl, less effective crosslinking density is big, anti corrosive medium penetration ability, excellent resistance to water and chemical resistance, but outdoors insolate resistance is poor.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
The effect of epoxy resin on the properties of epoxy coatings is introduced.
Epoxy resin is crosslinked by crosslinking agent. There are many kinds of crosslinking agents commonly used in epoxy resins, with dozens of them. The most common cross-linking agents of epoxy resins are various amine (such as adipolamine, lipocycline) and resin crosslinking agents.
The mechanical properties of coatings caused by crosslinking agents are mainly due to coating hardness, gel time and film drying time. The comprehensive performance of nx-2040 is best, with longer operating period and faster drying time, and the coating hardness is moderate. The differences in the chemical properties of coatings caused by crosslinking agents are mainly oil resistance, oil-water mixture, acid resistance and solvent resistance.
The solvents of acid and acetone were poor in the epoxy resins. The subaqueous epoxy resin, which contains water molecules in its molecular structure, has poor water resistance and salt tolerance. Similarly, the chemical resistance of nx-2040 crosslinking agent is excellent.
Epoxy resin is a kind of synthetic resin that contains two or more epoxies in the molecular structure and can be crosslinked. Epoxide group is made up of one atom of oxygen and two carbon atoms rings, highly active, enables epoxy resin with various types of crosslinking agent to produce crosslinking reaction, formation of two-dimensional reticular structure of the polymer.
The properties of epoxy resin have important relationship with molecular weight: low molecular weight epoxy resin has high hardness, large brittleness and low impact strength. Strong adhesion of linear epoxy resin, poor water resistance and more volatile coatings; The medium molecular weight epoxy resin hardness and flexibility moderate.
The softening point is the softening temperature of epoxy resin measured under the specified conditions, which can represent the molecular weight of epoxy resin. The low molecular weight of the softening point is high. Low molecular weight epoxy resin softening point < 50 ℃, polymerization degree < 2; Medium molecular weight of epoxy resin softening point in 50 ~ 95 ℃, the degree of polymerization of 2 ~ 5; High molecular weight of epoxy resin softening point > 100 ℃, polymerization degree > 5.
The coating material used in solvent or solventless epoxy self-leveling floor coatings is usually used in low-viscosity bisphenol A epoxy resin, bisphenol F type epoxy resin and adipose epoxy resin. Bisphenol A type epoxy resin, bisphenol F type epoxy resin with coupling agent and clinch A deal after cross-linking cross-linking of film containing hydroxyl, less effective crosslinking density is big, anti corrosive medium penetration ability, excellent resistance to water and chemical resistance, but outdoors insolate resistance is poor.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
The hydrogenated bisphenol A epoxy resin was used as base material with low viscosity and the ability to improve the weatherability of coating film. Due to no solvent epoxy floor coating can no longer in use the solvent to lower the viscosity of the coating material formula, so choose solvent-free epoxy coating binders, should meet the low viscosity, coating hydroxyl content and less effective crosslinking density etc., using aliphatic epoxy resin binders, can significantly improve weather resistance and physical and chemical properties of coating.
Solvent - based epoxy coatings must be used solvents. It is very important to use solvents to make solvent and dry time.
Epoxy resins can be dissolved in ketones, esters, ether alcohols and chlorinated hydrocarbon solvents, and are not soluble in aromatic hydrocarbons and alcohols. However, aromatics and alcohols can be used as solvents for the medium molecular weight epoxy resin. With the increase of molecular weight, the solubility of resin decreases.
Epoxy resins are cross-linked by progressive polymerization. The crosslinking agent of epoxy resin is generally divided into two types:
(1) reactive crosslinking agent. It can be combined with EP molecules, and the process of gradual polymerization of the reaction makes it into a network structure.
Characteristics: usually contains active hydrogen atoms, accompanied by the transfer of hydrogen atoms during the reaction. Such as polyamine, polycarboxylic acid, polythiol and polyphenol.
(2) catalytic crosslinking agent. It can lead to the crosslinking reaction of epoxy based on cationic or anionic polymerization.
Such as tertiary amine, imidazole and boron trifluoride.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The hydrogenated bisphenol A epoxy resin was used as base material with low viscosity and the ability to improve the weatherability of coating film. Due to no solvent epoxy floor coating can no longer in use the solvent to lower the viscosity of the coating material formula, so choose solvent-free epoxy coating binders, should meet the low viscosity, coating hydroxyl content and less effective crosslinking density etc., using aliphatic epoxy resin binders, can significantly improve weather resistance and physical and chemical properties of coating.
Solvent - based epoxy coatings must be used solvents. It is very important to use solvents to make solvent and dry time.
Epoxy resins can be dissolved in ketones, esters, ether alcohols and chlorinated hydrocarbon solvents, and are not soluble in aromatic hydrocarbons and alcohols. However, aromatics and alcohols can be used as solvents for the medium molecular weight epoxy resin. With the increase of molecular weight, the solubility of resin decreases.
Epoxy resins are cross-linked by progressive polymerization. The crosslinking agent of epoxy resin is generally divided into two types:
(1) reactive crosslinking agent. It can be combined with EP molecules, and the process of gradual polymerization of the reaction makes it into a network structure.
Characteristics: usually contains active hydrogen atoms, accompanied by the transfer of hydrogen atoms during the reaction. Such as polyamine, polycarboxylic acid, polythiol and polyphenol.
(2) catalytic crosslinking agent. It can lead to the crosslinking reaction of epoxy based on cationic or anionic polymerization.
Such as tertiary amine, imidazole and boron trifluoride.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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