Light plastering gypsum dry material and preparation method thereof

Abstract

The invention discloses a light plastering gypsum dry material and a preparation method thereof. The light plastering gypsum powder comprises following raw materials are in percentage by weight: 50 to80 percent of desulfurized gypsum powder, 5 to 20 percent of an active excitant, 8 to 35 percent of reinforced aggregate, 5 to 20 percent of light aggregate, 0.2 to 0.5 percent of a water-retaining agent, 0.2 to 1.5 percent of a tackifier, 0.03 to 0.1 percent of a stabilizer, 0.01 to 0.2 percent of a retarder and 0.005 to 0.02 percent of a catalytic additive; wherein the viscosity of the water-retaining agent is 40000-200000 mPa*s, and the water-retaining agent is a mixture of hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether. The preparation method comprises the following steps: weighing the components, pouring the desulfurized gypsum powder, the active excitant, the water-retaining agent, the tackifier, the stabilizer and the retarder into a stirrer for mixingand stirring, then pouring the reinforced aggregate and the light aggregate into a stirring frame, and finally adding water to obtain the light plastering gypsum. The light plastering gypsum has theadvantages that the water retention rate is high, the operable time of the plastering gypsum is further prolonged, and the bonding strength is improved.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a light-weight plaster dry material and a preparation method thereof. Background technique [0002] According to the sulfur content of my country's thermal coal, my country currently discharges nearly 100 million tons of wet desulfurization by-product - desulfurization gypsum every year; in addition, my country produces 11 million tons of phosphate fertilizer annually, and discharges 4 million tons of phosphogypsum, which is the same chemical gypsum as desulfurization gypsum. tons, and the accumulation of phosphogypsum for many years has reached hundreds of millions of tons. At present, the annual mining volume of natural gypsum in my country is about 50 million tons (of which 35 million tons are used for cement retarders, and the rest are converted into hemihydrate gypsum or low-surface gypsum) Gypsum board, etc.), so even if chemical gypsum can complete...

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Problems solved by technology

[0004] At present, the publication number is CN1840498A invention patent application publication specification discloses a desulfurized gypsum plaster plaster, which contains 90-99.8% by weight of desulfurized building gypsum, 0-9.8% by weight of hydraulic cementitious material, 0.1-0.5% by weight of retarder and 0.1-0.3% by weight of water-retaining agent, based on the weight of the desulfurized gypsum plastering material, and the preparation process of ordinary desulfurized gypsum-based plastering plaster is described. The plastering plaster does not have significant thermal insulation effect; A phase change energy storage desulfurization gypsum interior wall thermal insulation mortar, composed of desulfurization building gypsum, ordinary silicon cement, lime calcium powder and redispersible rubber powder in proportion to form a composite cement, vitrified microbeads, expanded perlite and silica-alumina matrix The hollow microspheres are composed of light base materials in proportion, octadecane wax with a melting point of 22°C is the phase change energy storage material, water retaining agent, polypropylene fiber, wood fiber, retarder, water reducing agent, air entraining agent, water repellent The admixture is composed of activator and composite activator, and the composite cementing material, light base material, phase change energy storage material and admixture are prepared by mixing the preparation process, and the use of phase change energy storage material octadecane wax and directional phase change is described. Material preparation of thermal insulation mortar, although its products have the performance of thermal insulation, heat insulation, and fine-tuning of humidity, but the preparation of its phase change material is complicated and the cost of material preparation is relatively high

At the same time, the common defects of the above two comparative documents are the technical problems that the bonding strength is not very high and the operating time is not high

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