News Details
Epoxy Resin Modified Polyamine Coating Crosslinking Agent
2017-7-21 11:10:49
Epoxy Resin Modified Polyamine Coating Crosslinking Agent
In order to overcome the brittleness of the amine crosslinker, poor impact resistance, poor weatherability and toxic effects, the amine cross-linking agent must be further modified in order to obtain non-toxic or low toxicity, at room temperature Crosslinked Epoxy Resin Modified Polyamine Crosslinker.
Epoxy resin modified polyamine cross-linking agent currently has many brands, the vast majority of modified amine type, type of modification, the proportion of raw materials and other aspects of undisclosed goods.
Even if the so-called modification of the same kind of cross-linking agent, due to different manufacturers, its nature is quite different. Each modified amine has a certain scope of application, so in the application should pay attention to choice.
Epoxy resin modified polyamine cross-linker product quality indicators are mainly amine value and viscosity. The amine value is a characteristic value of the amine content in the crosslinking agent and is usually expressed in milligrams of KOH in the amount of an acid and the like required for neutralizing the amino group in the 1 g modified crosslinking agent and can be determined by chemical analysis The The meaning of viscosity is the same as that of resin viscosity.
Amine modified a lot of ways, summed up the following methods are often used. Sometimes the application of one of the methods, and sometimes several methods and use, so the modified product is very complex.
The polyamine is subjected to an addition reaction with an epoxy group-containing compound or a resin. General amine excess, resulting in increased molecular weight of the adduct, boiling point and viscosity increased, the skin and mucous membrane irritation significantly reduced. Since the addition reaction produces hydroxyl groups, the crosslinking activity is improved. The cross-linked product properties of the adducts obtained from polyamines and epoxy resins are very similar to those of the polyamine crosslinks.
Addition of polyamines with ethylene oxide or propylene oxide, due to containing more hydroxyl, the general cross-linking reaction rate is relatively fast, the cross-linked products of mechanical, electrical, chemical resistance than the original polyamine slightly difference.
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
In order to overcome the brittleness of the amine crosslinker, poor impact resistance, poor weatherability and toxic effects, the amine cross-linking agent must be further modified in order to obtain non-toxic or low toxicity, at room temperature Crosslinked Epoxy Resin Modified Polyamine Crosslinker.
Epoxy resin modified polyamine cross-linking agent currently has many brands, the vast majority of modified amine type, type of modification, the proportion of raw materials and other aspects of undisclosed goods.
Even if the so-called modification of the same kind of cross-linking agent, due to different manufacturers, its nature is quite different. Each modified amine has a certain scope of application, so in the application should pay attention to choice.
Epoxy resin modified polyamine cross-linker product quality indicators are mainly amine value and viscosity. The amine value is a characteristic value of the amine content in the crosslinking agent and is usually expressed in milligrams of KOH in the amount of an acid and the like required for neutralizing the amino group in the 1 g modified crosslinking agent and can be determined by chemical analysis The The meaning of viscosity is the same as that of resin viscosity.
Amine modified a lot of ways, summed up the following methods are often used. Sometimes the application of one of the methods, and sometimes several methods and use, so the modified product is very complex.
The polyamine is subjected to an addition reaction with an epoxy group-containing compound or a resin. General amine excess, resulting in increased molecular weight of the adduct, boiling point and viscosity increased, the skin and mucous membrane irritation significantly reduced. Since the addition reaction produces hydroxyl groups, the crosslinking activity is improved. The cross-linked product properties of the adducts obtained from polyamines and epoxy resins are very similar to those of the polyamine crosslinks.
Addition of polyamines with ethylene oxide or propylene oxide, due to containing more hydroxyl, the general cross-linking reaction rate is relatively fast, the cross-linked products of mechanical, electrical, chemical resistance than the original polyamine slightly difference.
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
In order to overcome the shortcomings of these modified amine cross-linking reactions to meet the requirements of certain applications, usually with epoxy compounds and low molecular weight polyamide resin method of addition. As the latter has been a modification, the molecular chain is longer, the concentration of amino groups is relatively low, as long as the choice of properly, you can create a variety of process performance requirements of epoxy-polyamine adduct crosslinking agent.
Michael addition of polyamine (Michacl reaction). Compounds having an α, β unsaturated bond, such as acrylonitrile, acrylate, acrylamide and the like, can be added to the active hydrogen of the polyamine to reduce the irritation of the polyamine and to improve the phase of the polyamine with the epoxy resin Soluble.
Which is known as cyanoethylated polyamines and acrylonitrile addition reaction (Cyamome Hcylation), especially the effective modification method; according to different reaction conditions, can produce a variety of different levels of cyanoethylation products. These products are used in cross-linking agent, the cross-linked mechanical and electrical properties are reduced, no significant changes in chemical performance, solvent resistance improved.
Mannich addition polyamine. Polyamine and formaldehyde, phenol condensation reaction known as the Mannes reaction, and the current use of paraformaldehyde instead of formaldehyde aqueous solution in the solvent to the paraformaldehyde and urea, phenol reaction, obtained non-volatile urea - phenol - formaldehyde monomer , And then the monomer and ethylenediamine reaction of new epoxy resin crosslinking agent UP-FA.
The use of this process, you can avoid the use of formaldehyde aqueous solution, the introduction of water in the system, product processing complex, large loss of ethylenediamine and so on. At the same time can reduce costs, so that mild reaction conditions, easy to achieve the industrialization of products and commercialization.
This modification method can be used for ethylenediamine, diethylenetriamine, hexamethylene diamine, m-phenylenediamine, diaminodiphenyl methane and the like. Depending on the polyamine used, the phenols are different, and the different proportions and reactions of these materials are different, a series of products can be prepared.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
In order to overcome the shortcomings of these modified amine cross-linking reactions to meet the requirements of certain applications, usually with epoxy compounds and low molecular weight polyamide resin method of addition. As the latter has been a modification, the molecular chain is longer, the concentration of amino groups is relatively low, as long as the choice of properly, you can create a variety of process performance requirements of epoxy-polyamine adduct crosslinking agent.
Michael addition of polyamine (Michacl reaction). Compounds having an α, β unsaturated bond, such as acrylonitrile, acrylate, acrylamide and the like, can be added to the active hydrogen of the polyamine to reduce the irritation of the polyamine and to improve the phase of the polyamine with the epoxy resin Soluble.
Which is known as cyanoethylated polyamines and acrylonitrile addition reaction (Cyamome Hcylation), especially the effective modification method; according to different reaction conditions, can produce a variety of different levels of cyanoethylation products. These products are used in cross-linking agent, the cross-linked mechanical and electrical properties are reduced, no significant changes in chemical performance, solvent resistance improved.
Mannich addition polyamine. Polyamine and formaldehyde, phenol condensation reaction known as the Mannes reaction, and the current use of paraformaldehyde instead of formaldehyde aqueous solution in the solvent to the paraformaldehyde and urea, phenol reaction, obtained non-volatile urea - phenol - formaldehyde monomer , And then the monomer and ethylenediamine reaction of new epoxy resin crosslinking agent UP-FA.
The use of this process, you can avoid the use of formaldehyde aqueous solution, the introduction of water in the system, product processing complex, large loss of ethylenediamine and so on. At the same time can reduce costs, so that mild reaction conditions, easy to achieve the industrialization of products and commercialization.
This modification method can be used for ethylenediamine, diethylenetriamine, hexamethylene diamine, m-phenylenediamine, diaminodiphenyl methane and the like. Depending on the polyamine used, the phenols are different, and the different proportions and reactions of these materials are different, a series of products can be prepared.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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