According to experts, when a curing agent that reacts with an epoxy group is used, the effective cross-linking density after fully curing the epoxy resin having a high epoxy value is large. The corrosive medium has strong resistance through the coating film; epoxy resin with low epoxy value is the opposite, but too high cross-linking density makes the coating film brittle, so the active diluent is added to the epoxy resin component. Agent. The reactive diluent can reduce the viscosity of the paint, increase the susceptibility to mixing of the curing agent component and the epoxy resin component during the application, make the emulsification function of the curing agent to the epoxy resin more easily, and the active diluent itself can directly The reaction with the curing agent does not generate VOCs.
The choice of curing agent is crucial for the preparation of waterborne epoxy floor coatings. The waterborne epoxy coating is a multiphase system, the epoxy resin is a dispersed phase, and the curing agent is a continuous phase (for a water-soluble curing agent). Experts from the China Epoxy Resin Industry Association believe that the curing process is controlled by diffusion. The curing reaction first occurs at the interface, the viscosity of the epoxy particle surface gradually increases, and the curing agent gradually diffuses into the epoxy resin, further making the epoxy resin. Curing. The smaller the particle size of the epoxy emulsion particles, the closer the curing is to complete; the better the compatibility of the curing agent and the epoxy resin, the more easily the curing agent diffuses into the epoxy resin, which is favorable for curing. Common water-based curing agents include aliphatic amine adducts, alicyclic amine adducts, polyamides, and polyamide adducts. Fatty amine adducts and alicyclic amine adducts have a short pot life, a too fast cure rate, and the viscosity of the epoxy particle surface layer rises too rapidly. It is not conducive to the diffusion of curing agent into the epoxy particles, the curing is not complete, and the performance of the paint film is not ideal. The polyamide curing agent is poorly miscible with the epoxy resin component and there is an induction period, and the adduct with a polyamide resin can overcome this disadvantage. Water-soluble polyamide adducts are selected as the curing agent of the system in the country. The curing agent has good wettability on the wet concrete base surface and can be cured by open water. Even on the wet base surface, it has good curing performance, which solves the problem of difficult wet surface construction of solvent epoxy floor coatings.
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