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Wet gypsum accelerator and methods, composition, and product relating thereto

An accelerator and gypsum technology, applied in the field of compositions and products, methods, and wet gypsum accelerators, can solve the problems of lapse, acceleration loss of accelerator acceleration, loss of performance, etc., to reduce manufacturing costs, reduce manufacturing costs, effectively produced effects

Inactive Publication Date: 2008-05-21
USG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, even some potency of the accelerator is lost during grinding, and the gypsum seeds lose potency over time during handling or storage
The loss of acceleration efficiency of the accelerators is exacerbated when conventional accelerator materials are exposed to heat and / or moisture

Method used

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  • Wet gypsum accelerator and methods, composition, and product relating thereto

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] Example 1: Hydration Rate

[0051] This example illustrates the preparation of the wet gypsum accelerator and demonstrates the enhanced rate and efficiency of calcined gypsum hydration as a result of using the wet gypsum accelerator of the present invention as compared to utilizing a dry gypsum accelerator.

[0052] For the preparation of various wet gypsum accelerators (WGA), a Premier HM-45 wet bead mill equipped with PREMALLOY(R) discs and liners was used for initial wet grinding in the presence of one or more additives Galena from Gypsum Corporation, United States Calcium sulfate dihydrate obtained from the Park plant. The calcium sulfate dihydrate starting material had an initial median particle size of about 55 microns. Specifically, 50 gallons of process water, 400 lbs of calcium sulfate dihydrate, and 0.5% by weight (based on the weight of calcium sulfate dihydrate) of aminotris(methylenephosphonic acid) pentasodium salt (Dequest(R) 20...

example 2

[0056] Example 2: Hydration Rate

[0057] This example illustrates the preparation of WGAs and demonstrates the enhanced efficiency that results from the use of WGAs of the invention.

[0058] To prepare various WGAs, eight different sulfuric acid dihydrates supplied from the factory of United States Gypsum Corporation were initially wet-milled using a Premier HML-1.5 wet bead mill (laboratory ultra-precision mill) in the presence of one or more additives calcium. The calcium sulfate dihydrate starting material is a material with impurities varying between highly impurity mined gypsum to pure synthetic gypsum. Specifically, 4000 ml of process water, 3000 grams of calcium sulfate dihydrate (43% solids) and 0.75% by weight (based on the weight of calcium sulfate dihydrate) of aminotris(methylenephosphonic acid) pentasodium salt (Dequest(R) 2006 ) and sodium trimetaphosphate (NaTMP) and grind at 4-5 strokes at 0.6 gallons per minute in a spiral fluted stainle...

example 3

[0063] Example 3: Efficiency

[0064] This example illustrates the preparation of WGA and demonstrates that the enhanced rate of hydration is a result of using the WGA of the invention.

[0065] To prepare the various WGAs, calcium sulfate dihydrate from the Southard plant of the United States Gypsum Company was initially wet ground using a Premier HML-1.5 wet bead mill (laboratory ultra-precision mill) in the presence of one or more additives. Specifically, three WGA formulations including (1) 43% solids, (2) 33% solids, and (3) 22% solids were tested. Recipe (1) included 4000 ml of tap water, 3000 grams of calcium sulfate dihydrate, and 0.75% by weight (based on the weight of calcium sulfate dihydrate) of aminotris(methylenephosphonic acid) pentasodium salt (Dequest(R) 2006) and trimetaphosphoric acid Sodium (NaTMP) each. Recipe (2) comprised 4690 ml of tap water, 2310 grams of calcium sulfate dihydrate and 0.5% by weight (based on the weight of calc...

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Abstract

A wet gypsum accelerator comprising ground product having a median particle size of from about 0.5 micron to about 2 microns and calcium sulfate dihydrate, water, and at least one additive selected from the group consisting of (i) an organic phosphonic compound, (ii) a phosphate-containing compound, or (iii) a mixture of (i) and (ii), is disclosed. Also disclosed are a method of preparing a wet gypsum accelerator, a method of hydrating calcined gypsum to form an interlocking matrix of set gypsum, a set gypsum-containing composition, and a set gypsum-containing product.

Description

technical field [0001] The present invention generally relates to gypsum compositions. More particularly, the present invention relates to wet gypsum accelerators for accelerating the hydration of calcined gypsum to calcium sulfate dihydrate, and to methods, compositions and products related thereto. Background technique [0002] Set gypsum, which includes calcium sulfate dihydrate, is a well-known material commonly included in many product types. For example, set gypsum is the mainstay of end products produced by utilizing traditional plaster of paris (e.g., interior building walls faced with plaster of paris), as well as gypsum board used in typical drywall construction for interior walls and ceilings of buildings. Component. In addition, set gypsum is a major component of gypsum / cellulose fiber composite boards and products, and is included in products for filling and smoothing joints between gypsum board edges. [0003] Typically, the gypsum-containing product is prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/00
CPCC04B2103/12C04B2111/0062C04B28/14C04B40/0039C04B20/008C04B20/026C04B22/143C04B22/16C04B24/003
Inventor 余强斯图尔特·欣肖迈克尔·M·斯特里特W·戴维·宋迈克尔·博林德罗伯特·普赖斯
Owner USG CORP
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