Gypsum powder and application thereof

Abstract

The invention relates to gypsum powder and application thereof. The gypsum powder is prepared from, by weight, 100 parts of alpha gypsum, 1-3 parts of a reinforcing agent, 1-3 parts of a volume stabilizing agent, 0-1 part of a setting time adjusting agent, 0.1-1 part of a foam stabilizer, 0.1-4 parts of a waterproof agent and 0.1-1 part of a toughening agent. The gypsum powder has advantages of short initial setting time and final setting time, high absolute dry compression strength, low water absorption and the like. Fireproof door core plates made from the gypsum powder overcome defects of magnesite fireproof door core plates, fire resistance of the door core plates is improved is by taking the advantage of the characteristic that the gypsum powder releases crystal water under a high-temperature condition, and the door core plates have advantages of high fire resistance, environmental friendliness and the like.

Description

technical field [0001] The invention belongs to the field of structural materials, and in particular relates to gypsum powder and its application. Background technique [0002] In the past, vermiculite, aluminum silicate fiber, rock wool, and expanded perlite boards were generally used as filling materials for fire doors. The Fire Department of the Ministry of Public Security stipulates that rock wool and aluminum silicate materials are seriously harmful to people's health due to dust pollution. From January 1, 2009, rock wool and aluminum silicate (door core) materials will be compulsory eliminated. At present, the door core material that meets the quality and production process requirements of fire doors is the first choice for magnesite fire door core boards. [0003] The core board of magnesite fire door is made of magnesium chloride, light-burned magnesia, glass fiber cloth, synthetic fiber, modifier, foam agent and water, and is made of flat mold or vertical mold, wit...

AI Technical Summary

Problems solved by technology

[0004] However, the magnesite fireproof door core board has its own defects: 1. The magnesite material reacts with the metal after absorbing water and moisture, causing brine and moisture to return, and the door board is corroded, resulting in rotten door and core, which affects the service life; 2. The board body Pulverization, mudification, strength attenuation; 3. Strong water absorption, serious glue consumption, resulting in increased glue costs, and even degumming and hollowing of door panels; 4. Poor fire resistance, high loss rate of core material quality

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