Nowadays, waterborne epoxy floor coatings are more and more widely used. As the leading product of floor coatings, the performance improvement of epoxy floor coatings has been paid attention to, and the selection of curing agents which play an important role in film formation has recently made new achievements. According to experts from China Epoxy Resin Industry Association, when curing agent reacting with epoxy group is used, the effective crosslinking density of epoxy resin with high epoxy value is high after fully curing. The epoxy resin with low epoxy value has the opposite effect, but it is easy to make the film brittle because of its high crosslinking density, so active diluent is added to the epoxy resin component. Active diluent can reduce the viscosity of paint, increase the mixability of curing agent components and epoxy resin components during construction, make the emulsifying function of curing agent to epoxy resin easier to play, and active diluent itself can directly participate in the reaction with curing agent without producing VOC.
Waterborne epoxy floor
The choice of curing agent is very important for the preparation of waterborne epoxy floor coatings. Waterborne epoxy coatings are multiphase systems, epoxy resins are dispersed phases, and curing agents are continuous phases (for water-soluble curing agents). Experts from China Epoxy Resin Industry Association believe that the curing process is controlled by diffusion. The curing reaction first occurs at the interface, and the surface viscosity of epoxy particles gradually increases. At the same time, the curing agent gradually diffuses into the epoxy resin, which further solidifies the epoxy resin. The smaller the particle size of epoxy emulsion, the closer the curing is; the better the compatibility between curing agent and epoxy resin, the easier the curing agent will diffuse into epoxy resin, which is beneficial to curing.
The commonly used waterborne curing agents are aliphatic amine adduct, alicyclic amine adduct, polyamide, polyamide adduct and so on. Aliphatic amine adduct and alicyclic amine adduct have short application period, too fast curing speed, and the surface viscosity of epoxy particles increases too fast. It is not conducive to the diffusion of curing agent to the depth of epoxy particles, incomplete curing and poor performance of film. The miscibility of polyamide curing agent and epoxy resin component is not good and there is induction period, which can be overcome by the adduct of polyamide resin. Water-soluble polyamide adduct is chosen as curing agent in China. The curing agent has good wettability on wet concrete base surface and can be cured by draining water. Even on wet base, it has good curing performance, which solves the problem of difficult construction of solvent epoxy floor coating on wet surface.
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