Type II research progress of waterborne epoxy crosslinking agent

Type II research progress of waterborne epoxy crosslinking agent,Type II waterborne epoxy crosslinking agent with 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 with modified polyamide as type II waterborne 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.

Now successfully used in type II system is the first commercial water-borne epoxy crosslinking agent Casmide350, modified polyamide resin and hydrophilic organic solvent mixture. But using the crosslinking agent for coating performance is not ideal.

Currently used type II waterborne 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 segments of fatty amine polyoxyethylene chain reaction with dimer acid generated polyamide type of cross-linking agent. Which makes use of the hydrophilicity of polyoxyethylene chain segment, the crosslinking agent can be stable dispersion in water, and using epoxy resin as chain extender, can improve the compatibility of crosslinking agent and epoxy resin.




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


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.

In multiphase separation of state, it is only through certain mechanical stirring effect, and crosslinking agent phase to resin evenly distributed in water phase; (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).

Macromolecular main chain nylon, polyamide commonly known as it is the floorboard of the repeat unit polymer containing amide groups. Polyamide acid amine can be from inside the ring opening polymerization system, and also can be obtained by diamine and dibasic acid polycondensation. 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 known as acetic acid (36% - 36%), glacial acetic acid (98%), chemical formula CH3COOH, is a kind of organic acid, a yuan for the vinegar main ingredients. 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.

According to the laws of the polymer named polyethylene oxide and polyethylene glycol (peg) can be called the polyoxyethylene. Polyethylene oxide and polyethylene glycol (peg) is named after its monomer, non-standard, usually do not distinguish between. According to the habits, low molecular polyoxyethylene called polyethylene glycol, polyoxyethylene polymer called polyethylene oxide.

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com