Building gypsum coagulant and preparation method thereof

Abstract

The invention discloses a building plaster thickening time control agent and a preparation method thereof, relating to a building material. The building plaster thickening time control agent comprises the following two components: building plaster with the specific surface area of 5000-10000cm<2> / g, and a polycarboxylic acid water-reducing agent, wherein the weight of the polycarboxylic water-reducing agent is 0.4-1.3% of that of the building plaster with the specific surface area of 5000-10000cm<2> / g. Compared with the prior art, the protected building plaster thickening time control agent is capable of shortening the die sinking time in production of products, and improving the production efficiency.

Description

technical field [0001] The invention relates to a building material, in particular to a building gypsum coagulation regulator and a preparation method thereof. Background technique [0002] Building gypsum refers to calcium sulfate dihydrate (CaSO 4 2H 2 O) prepared by dehydration, with β-calcium sulfate hemihydrate (β-CaSO 4 ·1 / 2H2O) as the main component of powdery gelling material. Natural gypsum, phosphogypsum, and desulfurized gypsum are three types of gypsum that are currently widely used in construction. Since the main component of the coagulation regulator involved in the present invention is the ground building gypsum, in order to distinguish it from the unground building gypsum, the 1000~4000cm 2 / g of building gypsum is called ordinary building gypsum. [0003] Ordinary building gypsum, as one of the three major cementitious materials, can be used to produce building materials such as plastering gypsum, gypsum blocks, gypsum wallboards, and paper-faced gypsum...

AI Technical Summary

Problems solved by technology

At present, the building gypsum coagulation regulators used in industrial production are divided into two categories: retarders and coagulation accelerators. Common retarders include citric acid, polyphosphate, borax, tartaric acid, bone glue, protein organic matter, etc. These Retarders will either reduce the strength of the product or be expensive, and are rarely used in the production of gypsum wall materials

Common coagulants are mainly sulfates, such as sodium sulfate, potassium sulfate, etc., but the incorporation of such sulfates will cause hair growth and other phenomena, which is not suitable for the production of gypsum wall materials

At the same time, these coagulation regulators cannot adjust the interval between initial setting and final setting of ordinary building gypsum.

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