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Gypsum compositions and related methods

A composition, gypsum technology, applied in the direction of building materials, etc., can solve problems such as lack of dimensional stability

Inactive Publication Date: 2005-05-04
USG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lack of dimensional stability becomes more of a problem as the amount of water in aqueous calcined gypsum mixtures increases

Method used

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  • Gypsum compositions and related methods
  • Gypsum compositions and related methods
  • Gypsum compositions and related methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Laboratory preparation of plaster moldings and various testing processes

[0088] Samples of set gypsum-containing compositions were prepared according to the present invention and their dry density, noise reduction value (NRC) and drying shrinkage were compared.

[0089] A setting accelerator by dry blending 300 g of beta calcium sulfate hemihydrate and 2.0 g of finely ground particles of calcium sulfate dihydrate coated with sugar to maintain efficiency and subjected to as described in U.S. Patent 3,573,947 (which is incorporated herein by reference) Gypsum moldings are prepared at various ratios of water to plaster (such as calcined gypsum) by heating as described above. The samples were then mixed with various amounts of tap water at 70°F (≈21°C) in a 5 liter WARING mixer, allowed to soak for 5 seconds and mixed on low speed for 10-25 seconds . The amounts of water to stucco (ie, calcined gypsum) are varied such that the water to stucco ratio is from abo...

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Abstract

A solidified gypsum composition and preparation method were disclosed. The set gypsum composition comprises a continuous phase of a chimeric set gypsum matrix having a high water porosity and / or is prepared from a mixture (such as a plaster) containing a high ratio of water to calcined gypsum. A product containing the solidified plaster composition was also released.

Description

technical field [0001] The present invention generally relates to gypsum compositions and methods of making gypsum compositions. More specifically, the present invention relates to set low density gypsum compositions and methods for their preparation. Background of the invention [0002] Set gypsum (calcium sulfate dihydrate) is a well known material commonly found in many types of articles. For example, set gypsum is the main ingredient in finished products made with conventional calcined gypsum, such as interior walls of buildings with plaster of paris, and is a common dry finish for interior walls and ceilings of buildings The main component of paper facing gypsum board. Furthermore, set gypsum is a major component of gypsum / cellulose composite fiberboard and its products, and it is also contained in products for filling the edge joints of gypsum boards. Many special materials, such as those used for precision machining molding and molding, also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/00C04B22/16C04B24/26C04B28/14C04B111/40E04C1/40
CPCC04B28/147C04B2111/00068C04B2111/00612C04B2111/0062C04B2111/34C04B22/16C04B24/2641C04B2103/40
Inventor Q·余S·维拉马苏纳尼F·T·约内斯
Owner USG CORP