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The first generation product is emulsified directly with emulsifier. Under vigorous mechanical agitation, the emulsion particles are obtained. The particle size of the emulsion obtained in this way is large, generally about 5 μm. Due to the presence of free emulsifier in the emulsion, the cured When it encounters water, it will precipitate out of the coating film, resulting in poor water resistance of the paint film, and due to the coarse particle size, it is difficult to form a film, which restricts its application. The second-generation water-based epoxy resin is a water-soluble curing agent emulsified oil-soluble epoxy resin. This type of water-based epoxy resin system is characterized in that the curing agent used is water-soluble. When the two components are mixed and cured, the curing agent is The water phase diffuses into the resin particles, so the concentration of the curing agent on the surface of the resin particles is relatively high, which makes the surface easy to cure and form a hard shell, which prevents the resin particles from forming a film, and finally makes the resin and curing agent in the paint film unevenly distributed Influencing the performance of the paint film, leading to the mismatch of solubility parameters is also an important factor affecting the promotion of the second-generation waterborne epoxy system.
Another form of the second-generation waterborne epoxy system is to make the resin into a water-dispersible epoxy emulsion, and the curing agent is water-soluble. This system also has a problem of mismatched solubility parameters, because the epoxy resin is Hydrophobic and water-soluble curing agent has strong hydrophilicity. After the two components are mixed, there is a great difference in hydrophilicity and hydrophobicity, which affects the film-forming properties of the coating.
The third-generation waterborne epoxy system was successfully developed by the US Shell company for many years in the 1990s. Both the epoxy resin and the curing agent of this system are connected with nonionic surfactants, and there are no surfactants in the system. After the two components are mixed evenly, the solubility parameters are similar and the matching is good. After curing, a uniform paint film can be obtained, which can meet or exceed the performance index of the paint film of the solvent-based paint.
The third-generation water-based epoxy resin system can be used directly or indirectly as a coating, casting compound, molding compound, adhesive, or laminating material due to its excellent physical and mechanical properties, electrical insulation properties, chemical resistance properties, and adhesive properties. The form penetrates all aspects of the national economy from daily necessities to high-tech fields, such as: composite materials in aircraft and spacecraft, packaging materials for large-scale integrated circuits, insulation materials for generators, paint for steel and wood, machinery Adhesive for civil construction,
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