A kind of high-efficiency composite gypsum retarder and preparation method thereof

Abstract

The invention discloses an efficient compound gypsum retarder and a preparation method thereof. The efficient compound gypsum retarder is prepared by virtue of the following components in percentage by mass: 30%-40% of calcium hydroxide, 20%-30% of sodium tartrate, 20%-30% of protein hydrolysate, 10%-20% of an amino acid compound and 10%-20% of heavy calcium carbonate, wherein the raw materials are all in a powder state. By carrying out pulverization by virtue of a pulverizer, the pulverized product has certain stability and is stirred by virtue of a mixing machine, so as to obtain the efficient compound gypsum retarder. The gypsum retarder is successfully synthesized by virtue of a relatively simple current method and has the advantages of low addition amount, little strength loss, strongweather resistance and the like; by changing the alkalinity of a system, the setting time of building gypsum can be remarkably adjusted and controlled, and the setting mechanism of the building gypsum is changed through stimulating a synergistic effect, and certain guidance and promotion effects on the development of building operations of plastering gypsum are achieved.

Description

technical field [0001] The invention relates to the field of gypsum building materials, in particular to a high-efficiency composite gypsum retarder and a preparation method thereof. Background technique [0002] Building gypsum is a bright spot in the development of energy-saving and environmentally friendly building materials industry. It has excellent properties such as earthquake resistance, fire resistance, and water resistance, but its setting time does not exceed 20 minutes, which cannot meet the construction requirements of painting and smearing. Or adjust the setting time of building plaster. Gypsum retarder is less added and has strong sustainability, so it is gradually favored by many gypsum product manufacturers. [0003] After more than 30 years of extensive and in-depth research, the types of gypsum retarders have been greatly expanded. At present, the commonly used types of gypsum retarders include: sugars (sugar calcium, gluconate), hydroxycarboxylic acids a...

AI Technical Summary

Problems solved by technology

Through the addition of these gypsum retarders, the gypsum product industry has achieved some good results. However, when these retarders are applied to plaster plaster, there is a large loss of strength, poor controllability of setting time, and retarder loss in strong acid-base environments. Living defects, the retarder is unstable and self-degraded during the setting process of building gypsum, and the retarding time is limited, which limits its further application

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