In order to improve the compatibility between epoxy resin and curing agent in epoxy floor paint and the water resistance of the film, it is very important to design the form of dispersions of epoxy resin and curing agent. On the one hand, the hydrophilic groups of epoxy resins are modified. The early epoxide emulsion is prepared by the addition of emulsifiers, and its stability and water resistance are not good. Nowadays, polyethylene glycol, alcohol ether compounds or non-ionic surfactants are used to modify the reaction with epoxy resin, and introduce hydrophilicity into the epoxy resin molecules. The group has self emulsifying property.
On the other hand, the curing agent can be modified as an additive of bisphenol A and amine, which is also modified by hydrophilic groups, and there is no free non-ionic surfactant in the system. It is a water-based dispersion or oil-in-water emulsion, which can be used to reduce the viscosity of the system without phase separation. When coating is diluted, it is necessary to add acetic acid to stabilize the amine curing agent. At present, many patents of such water dispersions curing agents have been published abroad, and some domestic manufacturers have introduced such curing agents. It has been applied in some fields. The system of water-borne epoxy emulsion and dispersions of waterborne amine curing agent is called V type waterborne epoxy system. It changes the water soluble state of amine curing agent in the past, and improves the compatibility with resin. Some people have studied the V type system by atomic force microscope, which shows that the uniformity of coating film has been greatly improved.
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