Gypsum plaster for mechanical spray and preparation method of gypsum plaster

Abstract

The invention relates to gypsum plaster for mechanical spray and a preparation method of the gypsum plaster. The gypsum plaster is prepared from the following components in parts by weight: 50 to 70 parts of gypsum powder, 20 to 35 parts of quartz sand, 5 to 15 parts of heavy calcium carbonate powder, 20 to 30 parts of perlite, 0.1 to 0.4 part of water retaining agent, 2 to 5 parts of re-dispersible latex powder, 0.1 to 0.5 part of retarder, 0.1 to 0.4 part of starch, and 0.05 to 0.3 part of aluminum hydroxide. The gypsum plaster has the beneficial effects that the gypsum plaster prepared by the invention can be constructed in a mechanical spray manner, saves time and labor and has the characteristics of environmental protection, energy conservation and no pollution. The content of chlorine ions of the gypsum plaster is greatly reduced, the gypsum plaster is ensured not to corrode a wall easily, the binding performance is good, the mechanical spray construction process requirement can be met, the condensation time is appropriate, the water retention performance is good, the bubbling and cracking phenomenon is avoided, and the gypsum plaster is environment-friendly, energy-saving, pollution-free and convenient in construction.

Description

technical field [0001] The invention relates to a plaster plaster for mechanical spraying and a preparation method thereof, belonging to the technical field of chemical building materials. Background technique [0002] With the rapid development of social economy, people's demand for resources is becoming more and more urgent. In order to improve the comprehensive utilization rate of resources, the country vigorously promotes the reuse of waste, so as to realize the comprehensive, coordinated and sustainable development of resources, environment and society. At present, the application of desulfurized gypsum, a chemical by-product, has been widely valued. Although domestic and foreign scientific researchers have conducted some research on desulfurized gypsum, there is still a lack of systematic and comprehensive exploration of its performance characteristics and treatment processes, and many aspects are still lacking. Reliable research conclusions and lack of related standar...

AI Technical Summary

Problems solved by technology

At present, the application of desulfurized gypsum, a chemical by-product, has been widely valued. Although domestic and foreign scientific researchers have conducted some research on desulfurized gypsum, there is still a lack of systematic and comprehensive exploration of its performance characteristics and treatment processes, and many aspects are still lacking. Reliable research conclusions and lack of related standards and norms restrict the development of desulfurized gypsum industry to a large extent. There are many factors affecting the quality of desulfurized gypsum, among which soluble impurities have a great impact on it. Representative It is chlorine ion, which mainly comes from the combustion of fuel coal and the introduction of process water. If the impurity content exceeds the limit value, the performance of gypsum products will deteriorate. In industry, water washing is generally used for washing, but the effect is not ideal. Chlorine Ions are the key factors affecting desulfurization gypsum products

Excessive chloride ion content will cause corrosion of gypsum products when used as building materials; dehydration of desulfurized gypsum is difficult; it cannot be completely dried; resulting in reduced strength or even loss of strength of gypsum boards; at the same time, chloride ions will migrate to The surface of the product affects the bonding ability of the gypsum core material and the paper surface of the gypsum board, resulting in the separation of the cardboard

Excessively high chloride ion content in desulfurized gypsum will also affect the crystallization properties of chloride ions, resulting in the phenomenon that the desulfurized gypsum slurry does not condense and cannot form strength, which seriously affects the performance of gypsum products

Although the national standard GB / T 28627-2012 does not require the content of chloride ions in raw materials, as a raw material for plastering plaster, too high content of chloride ions in desulfurized gypsum will affect its bonding performance and mechanical properties. Publication number CN101033127A, Using desulfurized gypsum instead of natural gypsum as raw material to prepare plastering gypsum, wherein desulfurized gypsum accounts for 70% to 90%, resulting in excessive chloride ion content, which is easy to corrode the painted wall surface; publication number CN104193280A uses α hemihydrate gypsum as the basic raw material , α is more complicated to prepare than β gypsum, which leads to increased costs and is not conducive to market promotion. More environmentally friendly and energy-saving plaster plaster has broad prospects

Publication number CN104211365A has invented a plastering material using waste gypsum. The additives in the formula are emulsion and stabilizer, which are not easy to make dry powder, which is not conducive to mechanized construction, and the water retention effect is not ideal