A self-migrating surface hydrophilic covering agent and its preparation method and application

Abstract

The present invention proposes a self-migrating surface hydrophilic coating agent and its preparation method and application. The coating agent utilizes a coating agent matrix composed of a hydrophobic epoxy resin composition and a hydrophilic curing agent composition. During the reaction and curing process of the resin and the curing agent, the hydrophobicity inside the system gradually increases. The water-oil amphiphilic surfactant is introduced into the covering agent, and its HLB value is between 7 and 9, which can be compatible with the resin or Compatible with some water, it can effectively reduce the viscosity in the system, which is beneficial to atomized spraying, and at the same time provide a certain degree of hydrophilicity for the system. At the same time, a highly hydrophilic surfactant is introduced. As the hydrophobicity inside the system gradually increases during the curing process, the compatibility between the highly hydrophilic surfactant and the matrix becomes poor, and it begins to migrate to the surface. Due to the poor compatibility , Migration is fast, and more enriched in the surface area of ​​the covering agent, providing excellent hydrophilicity for the surface.

Description

technical field [0001] The invention relates to the technical field of resin-bonded sand-based permeable building materials, in particular, the invention relates to a self-migrating surface hydrophilic coating agent and its preparation method and application. Background technique [0002] At present, the hardened and permeable ground pavement for the construction of sponge cities is widely used. Among them, the use of PC imitation stone permeable bricks is often used for municipal and residential permeable pavements due to their advantages of imitating granite, good water permeability, and high cost performance. However, the PC imitation stone permeable brick mainly uses cement as the cementitious material, so a layer of cement hydrate is inevitably wrapped on the surface of the sand fine aggregate, which blocks the true color of the colored sand to a certain extent. There is a large color difference in the dry and wet state, especially when the surface is dry, the surface i...

AI Technical Summary

Problems solved by technology

There is a large color difference in dry and wet conditions, especially when the surface is dry, the surface is dull and obviously white, which seriously affects the visual effect of imitation stone

Although the usual finish sprayed on the surface can improve the gloss and reduce the color difference between dry and wet on the surface, it usually makes the internal pores of the PC imitation stone permeable brick become hydrophobic, making it impermeable.