News Details
Type II waterborne epoxy paint crosslinking agent
2017-8-17 12:20:36
Type II waterborne epoxy paint crosslinking agent
II type water-borne epoxy coatings cross-linking agent and type I modified waterborne epoxy crosslinking agent has similarities, early used solvent epoxy crosslinking agent such as polyamide, also tried to polyamide with nonionic emulsifier emulsion dispersed in water.
Later use modified polyamide as II type water-borne epoxy crosslinking agent, it is the polyamide reaction with acetic acid, phosphoric acid or hydrochloric acid ammonium salt, and assisted in ethanol solvent soluble in water. But only this method improved the stability of the crosslinking agent in the water and hydrophilic, the coating performance and crosslinking performance still has not been improved, there are still low crosslinking rate is slow, gloss, low hardness of faults.
The first commercial aqueous epoxy crosslinking agent successfully used in type II system is Casmide350, which is a mixture of modified polyamide resin and hydrophilic organic solvent. However, the coating properties obtained by using these crosslinking agents are not ideal.
Currently in use of II type water-borne epoxy crosslinking agent is mainly used with hydrophilic segments of fatty amine polyoxyethylene chain reaction of epoxy and epoxy resin - amine crosslinking agent, or use with hydrophilic segment of fatty amine polyoxyethylene chain reaction with dimer acid generated polyamide type of cross-linking agent. Using the hydrophilicity of polyethylene chain, the crosslinking agent can be stabilized and dispersed in water, and the use of epoxy resin as chain extender can improve the compatibility of crosslinking agent and epoxy resin.
Waterborne epoxy resin with waterborne epoxy crosslinking agent of hydrophilic oil-wet equilibrium value close to achieve consistent coexistence steady state in the water phase, if the difference is bigger, strong hydrophilic group branch has gathered in aqueous phase, resulting in resin and crosslinking agent phase separation.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
II type water-borne epoxy coatings cross-linking agent and type I modified waterborne epoxy crosslinking agent has similarities, early used solvent epoxy crosslinking agent such as polyamide, also tried to polyamide with nonionic emulsifier emulsion dispersed in water.
Later use modified polyamide as II type water-borne epoxy crosslinking agent, it is the polyamide reaction with acetic acid, phosphoric acid or hydrochloric acid ammonium salt, and assisted in ethanol solvent soluble in water. But only this method improved the stability of the crosslinking agent in the water and hydrophilic, the coating performance and crosslinking performance still has not been improved, there are still low crosslinking rate is slow, gloss, low hardness of faults.
The first commercial aqueous epoxy crosslinking agent successfully used in type II system is Casmide350, which is a mixture of modified polyamide resin and hydrophilic organic solvent. However, the coating properties obtained by using these crosslinking agents are not ideal.
Currently in use of II type water-borne epoxy crosslinking agent is mainly used with hydrophilic segments of fatty amine polyoxyethylene chain reaction of epoxy and epoxy resin - amine crosslinking agent, or use with hydrophilic segment of fatty amine polyoxyethylene chain reaction with dimer acid generated polyamide type of cross-linking agent. Using the hydrophilicity of polyethylene chain, the crosslinking agent can be stabilized and dispersed in water, and the use of epoxy resin as chain extender can improve the compatibility of crosslinking agent and epoxy resin.
Waterborne epoxy resin with waterborne epoxy crosslinking agent of hydrophilic oil-wet equilibrium value close to achieve consistent coexistence steady state in the water phase, if the difference is bigger, strong hydrophilic group branch has gathered in aqueous phase, resulting in resin and crosslinking agent phase separation.
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
In the state of polyphase separation, the resin phase and crosslinking agent can be distributed evenly in the water phase only through certain mechanical mixing. (uniform mixing is very important in the application of epoxy) (some friends in the process of using oily epoxy don't even think simply stirring can film, in fact this is a big mistake, because the use of oily epoxy is composed of solid epoxy dissolve like 75% of 20, E - even without crosslinking agent, solvent evaporation can form very hard after the state of dry film, but the dry film is without crosslinking agent crosslinked crosslinking, heated into liquid, dry film no performance).
Polyamide, commonly known as nylon, is the general term for polymers containing amide groups in the main chain of large molecules. Polyamide can be polymerized from the inner acid amine, or polyamide and di-acid condensation. Polyamide has good comprehensive performance, including mechanical properties, heat resistance, abrasion resistance, chemical resistance and self-lubrication, and low friction coefficient, have certain flame retardant, easy processing, suitable for reinforced with glass fiber and other packing, improve performance and expand the application range.
Acetic acid, also called acetic acid (36% - 38%), glacial acetic acid (98%), chemical CH3COOH, is an organic monoacid, which is the main component of vinegar. Pure anhydrous acetic acid (glacial acetic acid) is a colorless hygroscopic solid, freezing point is 16.6 ℃ (62 ℉), colorless crystals after solidification, its aqueous solution in weak acid and corrosion resistance is strong, the eyes and nose stimulating role of steam.
Polyethylene oxide and polyethylene glycol are known as polyethylene glycol based on polymer nomenclature. Polyethylene oxide and polyethylene glycol are named after their monomers and are not standardized and are usually not distinguished. According to the habit, low-molecular-polyoxyethylene is called polyethylene glycol, which is called polyethylene oxide.
Unsaturated bonding is one of the oldest crosslinking techniques used in alkyd resin. Now it is applied to waterborne coatings through research and innovation.
The crosslinking process of double bonds, first of all, is oxidized to the oxygen base, then the intermolecular crosslinking, the catalytic agent (cobalt salt) catalytic crosslinking reaction. However, the traditional alkyd resin is dependent on the double bond crosslinking of fatty acids, which has serious shortcomings. Firstly, the crosslinking reaction time is long and the harmful gases (aldehydes and ketones) are released continuously. Second, with the continuous crosslinking of the paint film, the film will be brittle and yellowing.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
In the state of polyphase separation, the resin phase and crosslinking agent can be distributed evenly in the water phase only through certain mechanical mixing. (uniform mixing is very important in the application of epoxy) (some friends in the process of using oily epoxy don't even think simply stirring can film, in fact this is a big mistake, because the use of oily epoxy is composed of solid epoxy dissolve like 75% of 20, E - even without crosslinking agent, solvent evaporation can form very hard after the state of dry film, but the dry film is without crosslinking agent crosslinked crosslinking, heated into liquid, dry film no performance).
Polyamide, commonly known as nylon, is the general term for polymers containing amide groups in the main chain of large molecules. Polyamide can be polymerized from the inner acid amine, or polyamide and di-acid condensation. Polyamide has good comprehensive performance, including mechanical properties, heat resistance, abrasion resistance, chemical resistance and self-lubrication, and low friction coefficient, have certain flame retardant, easy processing, suitable for reinforced with glass fiber and other packing, improve performance and expand the application range.
Acetic acid, also called acetic acid (36% - 38%), glacial acetic acid (98%), chemical CH3COOH, is an organic monoacid, which is the main component of vinegar. Pure anhydrous acetic acid (glacial acetic acid) is a colorless hygroscopic solid, freezing point is 16.6 ℃ (62 ℉), colorless crystals after solidification, its aqueous solution in weak acid and corrosion resistance is strong, the eyes and nose stimulating role of steam.
Polyethylene oxide and polyethylene glycol are known as polyethylene glycol based on polymer nomenclature. Polyethylene oxide and polyethylene glycol are named after their monomers and are not standardized and are usually not distinguished. According to the habit, low-molecular-polyoxyethylene is called polyethylene glycol, which is called polyethylene oxide.
Unsaturated bonding is one of the oldest crosslinking techniques used in alkyd resin. Now it is applied to waterborne coatings through research and innovation.
The crosslinking process of double bonds, first of all, is oxidized to the oxygen base, then the intermolecular crosslinking, the catalytic agent (cobalt salt) catalytic crosslinking reaction. However, the traditional alkyd resin is dependent on the double bond crosslinking of fatty acids, which has serious shortcomings. Firstly, the crosslinking reaction time is long and the harmful gases (aldehydes and ketones) are released continuously. Second, with the continuous crosslinking of the paint film, the film will be brittle and yellowing.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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