Lithium silicate interior and exterior wall coating and preparation method thereof

Abstract

The invention discloses a lithium silicate interior and exterior wall coating and a preparation method thereof. The lithium silicate interior and exterior wall coating is prepared from the following raw materials: water, hydroxyethyl cellulose, a dispersing agent, a wetting agent, a defoaming agent, attapulgite, diatomite, calcined kaolin, ground calcium carbonate, titanium dioxide, a humectant, an acrylic emulsion, modified lithium silicate resin, a thickening agent and a coalescing agent. And the modified lithium silicate resin is modified lithium silicate resin subjected to silane coupling and hydrolysis, and has the characteristics of high strength, high strength and self-drying film formation, so that the floating phenomenon caused by saltpetering on the wall surface due to the coating is fundamentally avoided. The lithium silicate-based inorganic coating produced by taking the emulsion as a base material comprehensively reaches various performance indexes of the inorganic coating, the attractive effect of a wall surface is remarkably improved, and the weather resistance and the stability of the coating can also be improved. The preparation method of the coating is simple in step, mild in reaction condition and suitable for large-scale production and preparation.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a lithium silicate interior and exterior wall coating and a preparation method thereof. Background technique [0002] Inorganic architectural coatings are a hot spot in the development of the building materials industry in recent years. But at present, potassium silicate is the main film-forming material, but potassium ions will interact with gases (such as CO 2 ) undergoes a chemical reaction to form a substance soluble in water, so the resulting potassium salt dissolves in water. This potassium salt migrates from the paint to the paint surface with water. When the water vapor evaporates, it will remain on the surface of the wall in the form of white powder crystals or crystals into white hard lumps, causing problems such as pan-alkali and snail marks. The main cause of this problem is the dissolution of potassium ions in the water with the CO in the water 2 The reaction fo...

AI Technical Summary

Problems solved by technology

However, the inorganic coating made of it as a base material is brittle and easy to crack, and due to the weak adhesion of lithium silicate, the amount of pigments and fillers is relatively small, and the covering power of the coating is low. The most important thing is lithium silicate The storage stability of inorganic-based coatings is poor, it is difficult to make long-term (shelf life of 12 months) stable products, and the construction performance is not good enough

Therefore, there are few lithium silicate-based inorganic coating products on the market.

Moreover, due to the activity of lithium ions, if unmodified lithium silicate is used directly as the main film-forming substance of inorganic coatings, such coatings are prone to gelation, and the heat storage of the coatings is not enough, so it has no application value.

Images