Bottom layer brushing gypsum and application thereof

Abstract

The invention discloses a bottom layer brushing gypsum, which is prepared by mixing the following components in parts by weight: 200-500 parts of building gypsum, 485-785 parts of quartz sand, 3 parts of regulator, 5 parts of inorganic gel, 0.2-0.5 part of retarder and 2 parts of anti-cracking agent, wherein the quartz sand is one or the mixture of more than two of the quartz sands of 30 meshes, 40 meshes and 60 meshes in any proportion, the regulator is hydroxypropyl methyl cellulose, the inorganic gel is sodium bentonite, the retarder is a special retarder for polyphosphate gypsum, and the anti-cracking agent is lignocellulose; and the building gypsum is prepared by desulfurized gypsum according to the following method that the desulfurized gypsum enters a boiling calcinator after being pre-dried at the temperature of 80-90 DEG C, is calcined at the temperature of 120-130 DEG C, then is added into an impact type flour mill to be ground, and is prepared into the building gypsum after being cooled and aged. The invention has strong adhesive force, effectively inhibits the phenomenon of shrinkage cracking in plastering, and has good water resistance.

Description

(1) Technical field: [0001] The invention belongs to the technical field of comprehensive utilization of chemical building materials and solid wastes, and in particular relates to a method of using desulfurized gypsum as a main raw material to prepare plaster for bottom plastering. (two) background technology: [0002] Chinese patent documents CN1390796A, CN101423351A, and CN101580372A disclose methods for preparing stucco gypsum with desulfurized gypsum and anhydrite as base materials, but the above-mentioned prior art does not have in-depth research on the performance and optimization of the formula, and there are still poor stability, strength and hardness Shortcomings such as failure to meet specific construction requirements. [0003] At present, the bottom plaster plaster on the market is usually manufactured by mixing the purchased mixed sand with the surface plaster plaster in proportion. The performance of the product produced by this method is highly dependent on t...

AI Technical Summary

Problems solved by technology

[0002] Chinese patent documents CN1390796A, CN101423351A, and CN101580372A disclose methods for preparing plaster plaster with desulfurized gypsum and anhydrite as base materials, but the above-mentioned prior art has not conducted in-depth research on the performance and optimization of the formula, and there are still poor stability, strength and hardness Shortcomings such as failure to meet specific construction requirements

Under the condition of the same dosage, the total surface area of ​​fine sand is larger, while that of coarse sand is smaller, while the traditional process usually uses powdery quartz sand, which will bring anti-cracking after exceeding a certain thickness. performance degradation

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