Self-migration type surface hydrophilic finishing agent as well as preparation method and application thereof

Abstract

The invention provides a self-migration type surface hydrophilic finishing agent as well as a preparation method and application thereof. According to the finishing agent, a finishing agent matrix composed of a hydrophobic epoxy resin composition and a hydrophilic curing agent composition is utilized; the hydrophobicity in the system is gradually increased in the reaction curing process of the resin composition and the curing agent; a water-oil amphiphilic surfactant is introduced into the finishing agent, the HLB value of the finishing agent ranges from 7 to 9, the finishing agent can be compatible with resin and a part of water, viscosity can be effectively reduced in the system, atomization spraying is facilitated, and meanwhile certain hydrophilicity is provided for the system. Meanwhile, a high-hydrophilicity surfactant is introduced, the compatibility of the high-hydrophilicity surfactant and the matrix becomes poor and begins to migrate to the surface along with gradual increaseof hydrophobicity in the system in the curing process, and due to the fact that the compatibility is poor, migration is fast, more high-hydrophilicity surfactant is enriched in the surface area of the finishing agent, excellent hydrophilicity is provided 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.