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Inorganic composite structures enhanced by organic compounds

A structure and inorganic technology, applied in the field of inorganic composite structures reinforced by organic compounds, can solve the problems of reducing nail pull resistance, increasing the viscosity of slurry, and restricting the commercialization of inorganic composite structures, so as to prevent migration or Effect of leaching, increasing pull-out or peel strength

Active Publication Date: 2009-04-15
SAINT GOBAIN PLACO SAS
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0016] Therefore, several special problems greatly limit the commercialization of inorganic composite structures containing cellulose ethers as additives.
For example, the nail pull resistance can be reduced by adding some cellulose ethers, or the nail pull resistance can be increased with a polymer concentration greater than 5% by weight, but the latter will cause some problems, such as reduced flammability and extinguishability of the wallboard , commercially unacceptable cost and mold susceptibility
In addition, the addition of cellulose ether increases the viscosity of the slurry to unacceptable levels, which prevents mixing and formation of composite structures

Method used

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  • Inorganic composite structures enhanced by organic compounds
  • Inorganic composite structures enhanced by organic compounds
  • Inorganic composite structures enhanced by organic compounds

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specific Embodiment

[0230] control sample . 100 grams of beta-calcium sulfate hemihydrate was dry mixed with 0.13 grams of ground gypsum accelerator. Then, beta-calcium sulfate hemihydrate was added to 150 g of room temperature tap water in a 500 mL Waring blender. The slurry was mixed on low speed for 15 seconds. The slurry was then immediately poured into approximately 7"x2"x1 / 2" molds. After about 20 minutes, the samples were removed from the molds and placed in a 45°C convection oven where they were dried for at least 36 Hours. After removal from the oven, samples were cut into 5"x2" sections, weighed and sized. Data were used to calculate sample density. For gypsum wallboard, use three Bending strength was obtained by point bending test. Instron mechanical testing system with data acquisition software was used to determine mechanical behavior. Bending failure stress was calculated from failure load, test configuration and sample geometry. Pull-out resistance was performed from the two ha...

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Abstract

A composite structure is prepared from an aqueous slurry comprising a mixture of an inorganic material and a cellulose ether additive. The inorganic material hydrates in the presence of the additive to form a composite core substantially reinforced by the additive. Fibers, such as sized glass fibers, may be added to the slurry to synergistically improve the strength of the composite structure by combining with the additive. The concentration, viscosity grade and degree of substitution of the cellulose ether additive are selected to give the composite substantially improved nail pull resistance or flexural strength or both.

Description

technical field [0001] The field of the invention is composite and modular structures containing inorganic, discontinuous phases and organic additives, such as molded articles, free-standing structural supports, wall panels, containing Paper-covered wall panels, panels, underlayment, formwork, moisture-resistant boards, X-panels, insulation boards, bushings, soffit boards, back boards, thick-core plywood, ceilings, cement boards, gypsum glass mats board and gypsum fibreboard. Background of the invention [0002] Cellulose is a polysaccharide composed of individual anhydroglucose structural units linked by glycosidic bonds ( Figure 16 ). The number "n" of anhydroglucose structural units in the polymer backbone defines the degree of polymerization. In general, the preparation of cellulose ethers (CE's) involves replacing some of the hydroxyl hydrogen atoms in cellulose with substituents such as methyl, ethyl, carboxymethyl, hydroxyethyl, hydroxypropyl or derivatives of thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/14C04B24/38C04B111/30
Inventor 雅各布·弗里亚斯·波洛克克里斯托弗·D·塔格伦纳德·托里斯戴维·S·索恩
Owner SAINT GOBAIN PLACO SAS