Development of the hottest waterborne epoxy resin

The development of water-based epoxy resin

the research and development history of water-based epoxy resin has gone through three stages

● the first generation products are emulsified directly with emulsifier. Under intense mechanical stirring, lotion particles are obtained. In this way, the particle size of the obtained lotion is larger, which is generally 5 μ M or so, due to the existence of free emulsifiers in the lotion, when the cured product meets water, it will separate out from the film, resulting in poor water resistance of the film, and due to the coarser particle size, it is difficult to form a film, which restricts its application

● the second generation of water-based epoxy is water-soluble curing agent emulsified oil-soluble epoxy resin. The characteristic of this kind of water-based epoxy resin system is that the curing agent used is water-soluble. When the two components are mixed and cured, the curing agent diffuses from the aqueous phase into the resin particles. Therefore, the concentration of curing agent on the surface of the resin particles is relatively high, which makes the surface easy to cure and forms a hard shell, preventing the formation of film of the resin particles, The final 1 is to include Sinopec Maozhan base into the national petrochemical industry base plan, so that the uneven distribution of resin and curing agent in the paint film will affect the performance of the paint film, resulting in the mismatch of solubility parameters, which 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 dispersive epoxy lotion, and the curing agent is water-soluble. This system also has the problem of mismatch of solubility parameters, because the epoxy resin is hydrophobic, while the 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 property of the coating

● the third generation of waterborne epoxy system was successfully researched and developed by American shell enterprises for many years in the 1990s. The epoxy resin and curing agent of this system are connected with non-ionic surfactants, and there are no free ionic 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 is obtained, which can reach or exceed the film performance index of solvent based coatings. Due to its excellent physical machine, Solvay's new high-performance polymer composite factory was established in Changshu, Jiangsu Province in 2012. Its mechanical properties, electrical insulation, drug resistance and adhesion make 3D printing materials able to be reshaped, repaired and recycled, and can be used as coatings, castables, molding compounds, adhesives The direct or indirect use of laminated materials has penetrated into 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, coatings for steel and wood, adhesives for machinery and civil construction, and even anti-corrosion electrophoretic coating materials for the inner wall of food cans and metals, Its film thickness is 0.008mm and 0.012mm, and its application prospect is very broad