Admixture of gypsum slurry body

Abstract

The invention discloses an admixture for a gypsum slurry body. The admixture comprises a component A and a component B, wherein the component A comprises a poly-carboxylic acid water reducer and a foam stabilizer, and the component B comprises a modifier; the component A accounts for 1.0-20.0% of the weight of the admixture, and the component B accounts for 80.0-99.0% of the weight of the admixture; and the component B is one or several of cement, lime and soda powder, and the doped quantity of the admixture is 0.5-5.0% of the weight of gypsum powder. The invention has the characteristics of high water reduction rate and no coagulation delay and can lower the volumetric weight of the gypsum. By preparing plasterboards through the gypsum admixture, the energy consumption of the production can be greatly lowered, and the production efficiency is enhanced.

Description

technical field [0001] The invention relates to material additives. Specifically, polycarboxylate water reducing agent and foaming agent are used as the A component, and cement, lime, soda powder, etc. are used as the B component. A working admixture for gypsum slurry. Background technique [0002] Gypsum is one of the three traditional inorganic cementitious materials (cement, gypsum, lime) and is an important building material. With the development of the construction industry, gypsum board, which is the leading product of new interior wall materials, has the advantages of light weight, sound insulation, heat insulation, good fire resistance, safe living, easy replacement, and regeneration. Poisonous, odorless and pollution-free real green building materials. [0003] Gypsum wall building material is a really cheap and high-quality material, and the reason for its lower cost is that the preparation process is fast and efficient. [0004] In terms of improving the produc...

AI Technical Summary

Problems solved by technology

The theoretical water-to-plast ratio of hemihydrate gypsum is 18.61%, while the actual water consumption in the production of gypsum boards is 65% to 80%. More water can ensure the fluidity of the gypsum slurry, but it leads to the removal of excess water. The drying process is prolonged, and due to the evaporation of a large amount of water, the internal voids of the gypsum board are increased, and the strength is greatly reduced

At present, the water reducing agents used by domestic gypsum board manufacturers are mainly lignin sulfonate and naphthalene sulfonate formaldehyde condensation products; the disadvantage of lignin type water reducing agents is that the water reducing rate is low, and it will prolong the setting time of gypsum slurry. Thereby reducing the production rate of gypsum board; the disadvantages of naphthalene-based water reducing agent are low water reducing rate and high formaldehyde content, which is not environmentally friendly

[0005] In addition, one of the key indicators to be controlled in the production of gypsum boards is the board density. Light weight is the characteristic of gypsum boards. However, it is difficult to achieve the goal of light weight under the premise of ensuring a certain strength.

Generally, the gypsum board factory foams the gypsum slurry by using a common foaming agent, but because the foaming agent produces many bubbles and the size is not uniform, it is easy to cause uneven distribution of voids inside the gypsum board, resulting in board Density inhomogeneity, reducing the strength of gypsum boards

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