News Details
Waterborne epoxy crosslinking agent classification
2017-3-20 21:41:54
Waterborne epoxy crosslinking agent classification:
1, amine solution: formed by chemical modification with hydrophilic pro tour oil structure of water-soluble amine
Advantages: since the emulsification, does not contain any organic solvent, easy to realize "zero VOC" to avoid the negative impact of emulsifier, storage stability;
Disadvantages: higher viscosity, is asked for mixing process
2, amine emulsion: amine made water emulsion crosslinking agent under the condition of the emulsifier
Advantages: low viscosity, a relatively long period shall apply
Weakness: the poor stability, it reduces some performance, prone to local rich product area, crosslinking slower
3, amine dispersions, formed under high shear dispersion
Advantages: very low viscosity
Cons: poor stability
Waterborne epoxy resin is usually refers to the epoxy resin in the form of particles, liquid droplets or colloidal dispersion in water phase emulsion, water medium or aqueous solution, which is formed by the three difference between epoxy resin dispersed phase particle size are different.
The method of waterborne epoxy resin
According to different preparation methods, the waterborne epoxy resin has the following four methods: mechanical method, chemical modification method, on the contrary and curing agent emulsification method etc.
1) mechanical method
Mechanical method, namely direct emulsification method, can use ball mill, the colloid mill, the solid epoxy resin are's advance into micron grade epoxy resin powder, then add the emulsifier aqueous solution, and by mechanical stirring scatter particles in the water; Or a mixture of epoxy resin and emulsifier, heated to proper temperature, under the intense mixing gradually add water to form emulsion.
Mechanically of waterborne epoxy resin emulsion prepared by the process of the method is simple, the emulsifier dosage is less, but in the emulsion epoxy resin dispersed phase particle size is larger, irregular shape and size distribution of particles with wider, worthy of the emulsion stability, easy to collide with each other between the particle and condensation phenomenon, and the film forming performance of the emulsion is also poor.
Of course to improve the temperature at which the stirring dispersion can promote emulsifier molecule in the epoxy resin particle surface adsorption, the more effectively the epoxy resin particles could be stably dispersed in water phase.
2) chemical modification method
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Chemical modification method is also called the emulsification method, some hydrophilic groups introduced into the epoxy molecular chains, or block or graft, make the emulsifying properties of epoxy resin, when this modified polymer water emulsification, hydrophobic polymer molecular chain convergence integration particles, ionic groups or polar group distribution on the surface of the particles, with a like charges repel each other, as long as meet certain dynamics condition, can form stable waterborne epoxy resin emulsion, which is the basic principle of chemical modification of waterborne epoxy resin is prepared by.
With surface active effect is based on the introduction of the properties of hydrophilic group, chemical modification of waterborne epoxy resin emulsion can be classified into cationic, anionic and non-ionic three.
Through the appropriate method introduced in epoxy resin molecular chain carboxylic acid, sulfonic acid functional groups, such as neutralization of salt into the epoxy resin water dispersible properties. Commonly used methods of modification are functional monomer extender chain method and free radical grafting modification method.
Functional monomer extender chain is using epoxy group and low molecular chain extension agent such as amino acids, amino acid, amino compounds such as benzene sulfonic acid on the amino reaction, introduced in epoxy resin molecular chain carboxylic acid, sulfonic acid group, and following into salt can disperse in water phase.
Free radical grafting modification method is the use of bisphenol A epoxy resin molecular chain of the methylene activity, under the effect of peroxide is easy to form free radicals, copolymerization with vinyl monomer, acrylic acid, maleic anhydride and other monomers can be grafted into epoxy resin molecule chain, then neutralized by salt can be obtained after the emulsified epoxy resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
1, amine solution: formed by chemical modification with hydrophilic pro tour oil structure of water-soluble amine
Advantages: since the emulsification, does not contain any organic solvent, easy to realize "zero VOC" to avoid the negative impact of emulsifier, storage stability;
Disadvantages: higher viscosity, is asked for mixing process
2, amine emulsion: amine made water emulsion crosslinking agent under the condition of the emulsifier
Advantages: low viscosity, a relatively long period shall apply
Weakness: the poor stability, it reduces some performance, prone to local rich product area, crosslinking slower
3, amine dispersions, formed under high shear dispersion
Advantages: very low viscosity
Cons: poor stability
Waterborne epoxy resin is usually refers to the epoxy resin in the form of particles, liquid droplets or colloidal dispersion in water phase emulsion, water medium or aqueous solution, which is formed by the three difference between epoxy resin dispersed phase particle size are different.
The method of waterborne epoxy resin
According to different preparation methods, the waterborne epoxy resin has the following four methods: mechanical method, chemical modification method, on the contrary and curing agent emulsification method etc.
1) mechanical method
Mechanical method, namely direct emulsification method, can use ball mill, the colloid mill, the solid epoxy resin are's advance into micron grade epoxy resin powder, then add the emulsifier aqueous solution, and by mechanical stirring scatter particles in the water; Or a mixture of epoxy resin and emulsifier, heated to proper temperature, under the intense mixing gradually add water to form emulsion.
Mechanically of waterborne epoxy resin emulsion prepared by the process of the method is simple, the emulsifier dosage is less, but in the emulsion epoxy resin dispersed phase particle size is larger, irregular shape and size distribution of particles with wider, worthy of the emulsion stability, easy to collide with each other between the particle and condensation phenomenon, and the film forming performance of the emulsion is also poor.
Of course to improve the temperature at which the stirring dispersion can promote emulsifier molecule in the epoxy resin particle surface adsorption, the more effectively the epoxy resin particles could be stably dispersed in water phase.
2) chemical modification method
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Chemical modification method is also called the emulsification method, some hydrophilic groups introduced into the epoxy molecular chains, or block or graft, make the emulsifying properties of epoxy resin, when this modified polymer water emulsification, hydrophobic polymer molecular chain convergence integration particles, ionic groups or polar group distribution on the surface of the particles, with a like charges repel each other, as long as meet certain dynamics condition, can form stable waterborne epoxy resin emulsion, which is the basic principle of chemical modification of waterborne epoxy resin is prepared by.
With surface active effect is based on the introduction of the properties of hydrophilic group, chemical modification of waterborne epoxy resin emulsion can be classified into cationic, anionic and non-ionic three.
Through the appropriate method introduced in epoxy resin molecular chain carboxylic acid, sulfonic acid functional groups, such as neutralization of salt into the epoxy resin water dispersible properties. Commonly used methods of modification are functional monomer extender chain method and free radical grafting modification method.
Functional monomer extender chain is using epoxy group and low molecular chain extension agent such as amino acids, amino acid, amino compounds such as benzene sulfonic acid on the amino reaction, introduced in epoxy resin molecular chain carboxylic acid, sulfonic acid group, and following into salt can disperse in water phase.
Free radical grafting modification method is the use of bisphenol A epoxy resin molecular chain of the methylene activity, under the effect of peroxide is easy to form free radicals, copolymerization with vinyl monomer, acrylic acid, maleic anhydride and other monomers can be grafted into epoxy resin molecule chain, then neutralized by salt can be obtained after the emulsified epoxy resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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