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Fast setting premixed joint compound

A mixture and coagulation-type technology, applied in other chemical processes, chemical instruments and methods, etc., to achieve a powerful coagulation effect

Active Publication Date: 2016-04-27
USG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This joint compound base is calcium carbonate free

Method used

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  • Fast setting premixed joint compound
  • Fast setting premixed joint compound

Examples

Experimental program
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Embodiment 1

[0032] A pre-wetted, set-inhibited, setting premixed joint compound was prepared using the ingredients in Table 1. #1 Shock refers to dry calcium hypochlorite shock as commonly used in swimming pools. Bleach refers to household bleach, which is about 6% sodium hypochlorite in water. Bleach and pool blast are both used as contact biocides.

[0033] Table 1

[0034] Composition of setting premixed joint compound

[0035]

[0036] For both of the above compositions, joint compound bases were prepared by weighing the individual dry components and combining them in containers. Dry ingredients include calcium sulfate hemihydrate, calcium carbonate or talc, perlite, thickeners and retarders.

[0037] Water was weighed out and placed in a second container. For these examples, the target Brabender viscosity was 250. The remaining wet ingredients, including latex and preservatives, were also weighed out and added to the water.

[0038] The wet and dry components are then combi...

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Abstract

A joint compound system includes a set inhibiting, premoistened, setting, premixed joint compound and a set initiator. This set-inhibiting, pre-moistened, setting joint compound consists of a premixed setting joint compound base together with a calcium-free phosphate Chemical hydration of the gypsum component of joint compounds. This joint compound base does not contain calcium carbonate. Such setting initiators include alum for restarting the chemical hydration reaction.

Description

technical field [0001] The present invention relates to a premixed joint compound. Rather, it concerns joint compounds that chemically harden rapidly and reliably within a defined period of time. Background technique [0002] Walls made of gypsum wallboard are conventionally constructed by joining wall panels to studs and filling and coating the panels with a specially formulated composition called joint compound seams between. Wet joint compound (dry type; with joint grade) is placed inside the joint formed by the butt edges of the wall panels and the paper reinforcement tape is embedded in the joint with the joint compound, then allowed to Allow the seam compound to dry. When the joint compound dries, a second joint compound (surfacing or finish grade) is applied to the joint and allowed to dry as well. Joint compound usually has to be applied a third time, and after it dries, it can be sanded lightly and can be finished normally before applying a finishing material (p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B22/14
CPCC04B22/148C04B28/145C04B28/146C04B2103/0057C04B2103/0066C04B2111/00672C04B14/102C04B14/104C04B22/16C04B24/2641C04B40/065C04B40/0658C04B14/042C04B14/185C04B24/06C04B24/14C04B24/2623C04B24/383C04B2103/67C04B14/10C04B24/24C09K3/10
Inventor R·B·史蒂文斯C·J·米勒
Owner USG CORP