High strength calcium sulfate cotton fiber plate and its producing process

Abstract

The high strength calcium sulfate-cotton fiber plate is produced with calcium sulfate and cotton fiber as main material, and its material consists of calcium sulfate75-95 weight portions, waste cotton fiber 5-25 weight portions, water 20-30 weight portions, coagulating agent 0.1-1weight portion, retarder 0.1-1 weight portion, and waterproof agent 0.1-3 weight portions. The high strength calcium sulfate-cotton fiber plate has the production process includes the steps of: dry mixing fiber with gypsum powder, spraying compounded supplementary material, spreading, high pressure forming, cutting and hydration to settle. The present invention has waste material utilized, low production cost, and product performance similar to available gypsum plate.

Description

technical field [0001] The invention relates to a calcium sulfate cotton fiberboard and a manufacturing process thereof, belonging to the technical field of building materials. Background technique [0002] In the prior art, the partition walls and decorative gypsum fiberboards used in building houses are various in variety and structure; such as fiber gypsum boards, gypsum particle boards, calcium silicate boards, glass fiber reinforced gypsum boards and paper-faced gypsum boards. Its market demand is quite large, but the profits of sheet metal manufacturers are very low. The reason is that the existing gypsum board production technology is almost still in the 1950s, but the equipment cost is rising; the world's first gypsum particle board production line was built in Finland in 1986, with an annual output of 40,000 cubic meters; in 1988 The world's second gypsum particleboard production line was built in Nocheng, with an annual output of 60,000 cubic meters. The first gy...

AI Technical Summary

Problems solved by technology

[0019] Problem 1): Slurry method (wet method) production, fiber pulp needs to consume a lot of water and electricity; especially recycled cardboard pulping must soak, beat, and clean the sediment in the fiber pulp, resulting in secondary pollution of sewage ;

[0020] Problem 2): It is difficult to grasp the concentration of fiber pulp and the fluidity of pulp; the circulating water in the manufacturing process contains additives, which will affect the quality of reuse;

[0021] Problem 3): When gypsum powder and fiber slurry are mixed, a lot of fibers will be entangled on the mixer, and raw materials that are too saturated with water will accumulate in the dead corners of the mixer, which must be cleaned continuously; the raw and auxiliary materials cannot be accurately formulated, and the product quality is unstable. Conducive to continuous production;

[0022] Question 4): After the fiber is soaked in water for a long time, its quality is soft and its strength is affected;

[0023] Question 5): Water-saturated fibers will affect the hydration of gypsum board after being mixed with hemihydrate gypsum, and the strength of the board will be reduced;

[0024] Question 6): When the hemihydrate gypsum encounters water in advance, it will gel in advance and reduce the strength of the board;

[0025] Question 7): The moisture content of the board formed by wet pressing is several times the hydration amount of the final product board, and a large amount of heat energy must be consumed to evaporate and dry it;

[0026] Question 8): The production equipment is huge, with an annual production scale of 2 million square meters, and the required equipment capital is at least 20 million yuan; the installed power is not less than 800-1200KW; the direct production cost of the product is naturally high;

[0027] Problem 9): The cost of auxiliary materials is high: for example: the price of wood twigs is 1100 yuan / ton, and the price of recycled cardboard: 1200 yuan / ton

[0028] Question 10) The board structure affects the strength: the fibers are disorderly mixed in the gypsum powder; it will inevitably affect the strength

[0029] In addition, there are many published patent applications for gypsum fiberboard, such as Chinese patents 96118317.9; 01104166.8; 02202232.5; 00236591.X;

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