A kind of plasticized gypsum and preparation method thereof

Abstract

The invention provides plasticized gypsum and a preparation method thereof. The plasticized gypsum is prepared from the following raw materials in percentage by weight: gypsum powder, 30 percent to 35 percent of water, 0.1 percent to 0.15 percent of sodium trimethyl phosphate, 3 percent to 3.5 percent of calcium oxide, 1 percent to 1.5 percent of white cement and 5 percent to 6 percent of an ASH additive, wherein the percentage of the water, the sodium trimethyl phosphate, the calcium oxide, the white cement and the ASH additive is based on the weight of the gypsum powder; the ASH additive is vinyl acetate-ethylene polymer redispersible plasticized glue powder. The invention further comprises a preparation method of the plasticized gypsum. The plasticized gypsum provided by the invention can be used for preventing surface chalking and softening and has certain plasticity, high anti-fracture strength and tensile strength and good adhesion performance and durability.

Description

technical field [0001] The invention relates to a gypsum and a preparation method thereof, in particular to a plasticized gypsum and a preparation method thereof. Background technique [0002] The biggest defect of ordinary building gypsum is poor water resistance. The surface slowly absorbs water and deliquesces in the air environment for a long time and loses strength. , Poor plasticity and so on have always been the problems faced by the gypsum industry. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a plasticized gypsum that can prevent surface pulverization, increase the plasticity of gypsum material, improve flexural and tensile strength, have good adhesion and durability, and its preparation method. [0004] The present invention adds four kinds of additives to the gypsum substrate, changes the crystallization environment in the gypsum hydration process (from hemihydrate gypsum to dihydrate gypsum), opti...

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Problems solved by technology

[0004] The present invention adds four kinds of additives to the gypsum substrate, changes the crystallization environment in the gypsum hydration process (from hemihydrate gypsum to dihydrate gypsum), optimizes the crystallization process of crystals, and grows desired columnar crystals. And make the distribution and overlapping between crystals more reasonable, so as to increase the plasticity of gypsum materials, improve the flexural and tensile strength, and prevent surface pulverization. This can not only improve the comprehensive performance of materials, but more importantly, solve the problem of gypsum materials Problems of poor adhesion and poor durability of other surface coating materials (non-aqueous coating materials such as paints, resins, and pasting materials)

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