CaSO4.2H2O-doped polymer cement powder, CaSO4.2H2O-doped polymer cement waterproof paint, and preparation method of CaSO4.2H2O-doped polymer cement powder and CaSO4.2H2O-doped polymer cement waterproof paint

Abstract

The invention relates to a CaSO4.2H2O-doped polymer cement powder, a CaSO4.2H2O-doped polymer cement waterproof paint, and a preparation method of the CaSO4.2H2O-doped polymer cement powder and the CaSO4.2H2O-doped polymer cement waterproof paint. The CaSO4.2H2O-doped polymer cement waterproof paint is composed of a polymer emulsion and the CaSO4.2H2O-doped polymer cement powder, and can be divided into type I, type II, and type III based on physical and mechanical properties. The ratio of the polymer emulsion to the CaSO4.2H2O-doped polymer cement powder of the type I CaSO4.2H2O-doped polymer cement waterproof paint is 1:1.2; the ratio of the polymer emulsion to the CaSO4.2H2O-doped polymer cement powder of the type II CaSO4.2H2O-doped polymer cement waterproof paint is 1:2; and the ratio of the polymer emulsion to the CaSO4.2H2O-doped polymer cement powder of the type III CaSO4.2H2O-doped polymer cement waterproof paint is 1:3. The CaSO4.2H2O-doped polymer cement waterproof paint prepared by adjusting the ratio of cement to desulfurized gypsum is capable of satisfying requirements of national standard GB23445-2009 on mechanical properties and water resistance of polymer cement waterproof paints.

Description

technical field [0001] The present invention relates to desulfurized gypsum CaSO as industrial waste 4 2H 2 Application of O, especially with CaSO 4 2H 2 O is used as a raw material of polymer cement waterproof coating and its preparation method. Background technique [0002] Desulfurization gypsum is an industrial by-product obtained by desulfurization and purification of flue gas after combustion of sulfur-containing raw materials such as coal and petroleum. It uses limestone to fully contact with flue gas in the absorption tower. CaCO in 3 and O in air 2 Oxidation reaction to generate CaSO 4 2H 2 O, which is what we call dihydrate gypsum. At present, as a kind of industrial waste, desulfurized gypsum is encouraged by the state for its comprehensive utilization. [0003] At present, there are several ways to use desulfurized gypsum: [0004] It is added to cement clinker as a retarder to meet the control of cement setting time. At present, under the condition of ...

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Problems solved by technology

[0005] Using heated dehydration, the CaSO 4 2H 2 O conversion to CaSO 4 1 / 2H 2 O, as an air-condensing material used in the building materials industry, this method consumes a lot of energy, which does not comply with the national energy-saving and emission-reduction policy;

[0006] CaSO 4 2H 2 O is mixed with cement, fly ash and aggregate, and excited by a composite activator to disintegrate the vitreous body of fly ash and form a cementitious material together with the above materials. According to reports, this application method essentially acts as an inert filler for desulfurized gypsum However, its addition has a relatively large side effect on the mechanical properties of composite materials, mainly in terms of durability. The gel system prepared by using the above materials usually has a late strength shrinkage phenomenon.

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