Method for preparing surface layer gypsum plaster by utilizing reclaimed gypsum and prepared surface layer gypsum plaster

Abstract

The invention discloses a method for preparing surface layer gypsum plaster by utilizing reclaimed gypsum. Raw materials comprise main materials and auxiliary materials. The main materials comprise the following materials: 60 to 100 weight percent of the reclaimed gypsum and 0 to 40 weight percent of desulphurization gypsum and natural gypsum; the auxiliary materials comprise the following materials in percentage based on the total weight of the main materials: 0.4 to 0.6 percent of a retarder, 0.15 to 0.30 percent of a water retaining agent, 1.0 to 2.0 percent of an adhesive and 0 to 0.10 percent of a water reducing agent; after various raw materials are mixed uniformly, the mixture can be used by mixing uniformly with 50 to 55 percent of water based on the total weight of the gypsum. Thegypsum plaster has high workability and constructability and is bonded firmly with a base layer of a wall body; a coating does not crack and does not fall off; the volume stability is high; the operable time is long; the breaking strength, the compressive strength and the bonding strength are high; the cost is low; the problem about waste gypsum pollution is solved; the surface layer gypsum plaster can be used for a painting plaster layer of the wall body of a building.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial solid waste and plastering of building walls, and in particular relates to a method for preparing surface plastering gypsum by using recycled gypsum and the prepared surface plastering gypsum. Background technique [0002] The construction industry and the ceramics industry produce a large amount of waste gypsum every year, forming an ever-increasing "abandoned gypsum mountain". Blow away and pollute the living environment of local residents. For the waste gypsum that has been accumulated for a long time, it will cause more harm, and it will produce about 3%-5% of greenhouse gases, which will increase the global temperature, and when it is in an anaerobic environment and has organic matter with it When combined, it also produces the unpleasant-smelling H 2 S, it is harmful to the human body, and at the same time, a large amount of waste gypsum piled up also brings a huge bu...

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: Aiming at the problems of large amount of accumulated waste gypsum and directly using regenerated gypsum to prepare plastering gypsum with large water demand and low strength, a method for preparing surface plastering gypsum by using regenerated gypsum and its preparation are provided. The surface layer plastering gypsum, this method uses desulfurization gypsum, natural gypsum and water reducing agent to reduce the standard thick water demand of plastering plaster, improve its strength, this method not only improves the performance of recycled gypsum, prepared recycled gypsum-based plaster Gypsum, but also make full use of recycled gypsum, protect the environment and save production costs