A waterborne coating composition used for exterior walls of buildings and a preparing method thereof

Abstract

The invention discloses a water-based paint composition for building exterior walls and a preparation method thereof, comprising the following raw materials in parts by weight: 30-35 parts of water-based polyurethane emulsion, 25-29 parts of polyacrylate, 26-31 parts of isocyanate, polyether 25‑30 parts, 16‑20 parts of sodium methyl silicate, 11‑14 parts of sodium carbonate, 10‑15 parts of talc powder, 11‑16 parts of mica powder, 12‑17 parts of titanium dioxide, 8‑12 parts of sodium tripolyphosphate 9-13 parts of polyoxyethylene fatty acid ester, 7-11 parts of sodium polyacrylate, 6-10 parts of tricresyl phosphate, 5-9 parts of ethylene glycol butyl ether, 4-8 parts of tetrachloroisophthalonitrile , 3-7 parts of ethylene glycol, 5-8 parts of terpineol, 30-34 parts of deionized water; including the following steps: S1: water-based polyurethane emulsion, polyacrylate, isocyanate, polyether, sodium methyl silicate and deionized water in a blender. The invention has excellent waterproof performance, high tensile strength and good flexibility, and also has excellent mechanical properties, low cost, high yield and no pollution to the environment.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a water-based coating composition for building exterior walls and a preparation method thereof. Background technique [0002] The definition of paint refers to a fine chemical product that is coated on the surface of an object by a specific construction method and cured to form a beautiful and continuous protective film with a certain strength on the surface of the object, or to form a coating film with a certain special function. It can cover various defects on the coated surface to make it beautiful, that is, decorative; it can control moisture, isolate corrosive gases such as carbon dioxide, sulfur dioxide, and hydrogen chloride in the air, and prevent the climate from affecting the coated object and the metal substrate. Rust, that is, has a protective function; it can give the surface of the coated object various colors and has a marking effect; in addition, the ...

AI Technical Summary

Problems solved by technology

[0003] Existing water-based coatings do not have excellent waterproof performance, high tensile strength and good flexibility, limited range of application, do not have excellent mechanical properties, high cost, low yield, and serious environmental pollution, so , we propose a water-based coating composition for building exterior walls and its preparation method