The invention relates to inorganic paste for internal
thermal insulation of buildings and a preparation method thereof. The inorganic paste is mainly prepared from the following components in parts by weight: 6-15 parts of inorganic cementing material, 3-6 parts of a
polymer emulsion, 20-25 parts of a light heat-insulating material, 0.1-0.5 part of
cellulose, 0.5-1 part of dispersible
adhesive powder, 0.1-0.3 part of fibers, 0.0-0.1 part of an air entraining agent, 0.04-0.06 part of a film-forming agent, 0.1-0.5 part of a
retarder, 0.2-0.5 part of a hydrophobic agent, 0.1-0.5 part of a water
reducing agent, 0.1-0.5 part of a
thickening agent and 50-70 parts of water. According to the invention, the inorganic paste overcomes the following problems: a plate joint exists after existing internal
thermal insulation materials for buildings are spliced; after
putty finish paint is painted on the plate joint,
cracking is easy to occur, and fireproof performance is poor; and water needs to be added on site for stirring during construction, which leads to inconvenient construction,
dust pollution and environmental
pollution. The single-component inorganic paste material is prepared by selecting the light heat-insulating filler, the inorganic cementing material and the
polymer emulsion and matching the above substances with other components in the
system, can be subjected to integral batch scraping, and is free of
cracking risk; and the inorganic paste is prefabricated, and construction can be carried out without adding water and stirring on site.