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Water-resistant additives for gypsum wood fiber products

A technology of reagents and surfactants, applied in the field of producing the emulsion, can solve the problems of not teaching the water resistance of the final product, poor water resistance, etc.

Inactive Publication Date: 2006-01-18
HEXION SPECIALTY CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Baig teaches a mud crystallization modification, but does not teach the use of additional additives to improve the water resistance of the final product
[0011] Products in the prior art, such as ordinary gypsum boards, gypsum lines, gypsum blocks, and gypsum castings, have poor water resistance

Method used

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  • Water-resistant additives for gypsum wood fiber products

Examples

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Comparison scheme
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Embodiment Construction

[0025] Gypsum wood fiber product (GWF) is different from ordinary gypsum wallboard products, it is combined with established mud, gypsum and wood fiber, the ratio is 5 to 50 parts of wood fiber and the corresponding amount of gypsum to reach 100 % composition. Different from gypsum wallboard products, the present invention is mixed with the mud by a mechanical device, and requires subordinate additives, and the additives do not affect the fluidity of the mud during the production process, but inherently control the foaming process, and use wet Headbox at the end, where the GWF slurry is slanted into a vacuum wire mesh to form the initial mat shape, and dewatered after compression, and passed through a series of vacuum belt rollers, into a drying oven for final dewatering . The emulsion added as an additive must not cause plating or cracking on the vacuum belt. Instead of combining a paper face and a paper back, the GWF of the present invention has a non-paper core which has ...

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Abstract

The invention discloses a emulsions which are useful in imparting water-resistance to gypsum wood fiber products. In one embodiment, the emulsions comprise at least a wax, an alkyl phenol, at least one surfactant, polynaphthalenesulfonic acid salt, and a complexed starch. In another embodiment, the emulsions comprise a wax or a combination of waxes, an alkyl phenol, at least one surfactant, polynaphthalenesulfonic acid, an alkali metal hydroxide, and a complexed starch.

Description

field of invention [0001] The present invention relates to an additive for improving the water resistance of wood-gypsum products. The present invention relates to an emulsion comprising a wax or a mixture of waxes, an alkylphenol, at least one surfactant, a polynaphthalene sulfonic acid, and a starch complex; the emulsion is used for Improves the waterproof properties of gypsum wood fiber optic products. The invention also relates to a method of producing said emulsion. Background technique [0002] The properties of gypsum (calcium sulfate dihydrate) make it widely used in industrial and construction products, especially plasterboard. It is a widely used inexpensive raw material that, through a process of dehydration and rehydration, can be remolded, molded or otherwise brought into useful shapes. The base material of gypsum board is man-made from the hemihydroxide of calcium sulfate (gypsum), commonly known as stucco, which is produced by this thermal conversion proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/18C09D191/06C09D191/08C04B11/00C04B24/08
Inventor 史蒂文·J·万特林博内尔·S·瑟帕卡
Owner HEXION SPECIALTY CHEM INC