A water-resistant foamed gypsum insulation material and its preparation method

Abstract

The invention discloses a water-resistant foamed gypsum thermal-insulation material which is prepared from the following raw materials in parts by weight: 100 parts of modified desulfurized building gypsum powder, 5-10 parts of polymer composite emulsion, 0.1-0.5 part of polyvinyl alcohol fiber and 40-60 parts of mixing water. The modified desulfurized building gypsum powder is prepared by mixing the following raw materials in parts by weight and grinding in a ball mill for 0.5-1 hour: 100 parts of building desulfurized gypsum powder, 2-10 parts of sodium aluminate, 1-5 parts of natural base, 1-3 parts of sodium citrate, 5-20 parts of rice hull ash and 1-3 parts of trisodium phosphate. Besides, the invention also discloses a preparation method of the water-resistant foamed gypsum thermal-insulation material. The water-resistant foamed gypsum thermal-insulation material has the advantages of light weight, high strength, thermal insulation, fire resistance, water resistance, short manufacturing period, low cost and the like, can be directly used for internal wall thermal insulation and external wall thermal insulation of a building, and has certain carrying capacity.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a water-resistant foamed gypsum thermal insulation material and a preparation method thereof. Background technique [0002] According to the "Twelfth Five-Year Plan", during the "Twelfth Five-Year Plan" period, large-scale coal power bases added 147 million kilowatts of new desulfurization installed capacity, which also led to desulfurization gypsum becoming the second largest solid waste in power plants after fly ash. As of the end of 2012, there are more than 1.1×10 8 t The desulfurized gypsum pile exists in the ash yard. With the construction of flue gas desulfurization equipment, if the desulfurization gypsum is not effectively used, it will not only occupy a large amount of land, but also pollute the groundwater and damage the health of those who come into contact with it. Harmful substances such as heavy metals and organic pollutants contained in de...

AI Technical Summary

Problems solved by technology

At present, 90% of the thermal insulation materials on the Chinese market are organic materials. The most fatal defect of this type of thermal insulation material is that it is not fire-resistant. Although the thermal insulation effect is good in the early stage, it is easy to age and the maintenance cost in the later stage is high.

For the existing inorganic thermal insulation materials such as foam glass, foam aluminum, foam ceramics, rock wool and mineral wool and other fiber insulation materials, although the fire performance can meet the requirements, but considering the price, construction operability, environmental protection and energy saving and other factors, they cannot become Mainstream products in the insulation material market

In addition, the main defect of existing gypsum insulation materials is poor water resistance.

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