Gypsum plaster board

A paper-faced gypsum board and gypsum technology, which is applied in the field of gypsum building materials, can solve the problems of affecting the bonding ability of the protective paper, dampness, and inability to produce insoluble salt, so as to ensure the mechanical strength and moisture-proof performance and reduce the impact of strength. Effect

Pending Publication Date: 2021-12-17
BEIJING NEW BUILDING MATERIALS PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soluble impurities such as phosphorus and fluorine can be solidified by the lime method to produce insoluble calcium phosphate and calcium fluoride, but the chloride ions in it cannot produce insoluble salts, so it is difficult to be effectively treated
When the chloride ion content is too much, the product will have various problems such as dampness, sagging, and yellowing, and the strength of the gypsum hydration product will decrease. For the gypsum board, the high content of chloride ion will also affect the protective paper. Adhesive ability

Method used

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  • Gypsum plaster board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, the PVA powder was purchased from Taiwan Changchun Group, brand BP-24, with an average degree of polymerization of 2400 and a weight average molecular weight of 118000; polycarboxylate water reducer was purchased from BASF, brand 2651F; glass fiber was Medium-alkali glass fiber with a length of 15mm and a diameter of 10μm.

[0025] Stir 100kg of hemihydrate phosphogypsum powder containing 0.73% chloride ion (grade 85%), 60kg of water, 1.0kg of PVA powder, 10g of glass fiber and 0.5kg of polycarboxylate superplasticizer in a mixer, and then inject it through a metering pump 3kg of sodium lauryl sulfate foaming agent was stirred evenly to make a slurry; the above slurry was combined with upper and lower protective papers to form, cut, and finally dried to obtain a 9.5mm thick gypsum board.

Embodiment 2

[0027] In this example, the PVA powder was purchased from Taiwan Changchun Group, brand BP-24, with an average degree of polymerization of 2400, and a weight average molecular weight of 120,000; polycarboxylate water reducer was purchased from BASF, brand 2651F; glass fiber was E-glass fiber, length 9mm, diameter 15μm.

[0028] In this example, the VAE powder was purchased from Wacker Company, the brand name is TDS-5044N.

[0029] 100kg containing 0.65% chloride ion hemihydrate desulfurization gypsum powder (grade is 80%), 70kg water, 1.0kgPVA powder, 0.1kgVAE powder, 20g glass fiber and 0.5kg polycarboxylate water reducer are stirred in the mixer, and then Inject 5 kg of sodium lauryl sulfate foaming agent through a metering pump, stir evenly to make a slurry; combine the above slurry with upper and lower face protection paper, cut, and finally dry to obtain a 9.5mm thick plasterboard .

Embodiment 3

[0031] In this example, the PVA powder was purchased from Taiwan Changchun Group, brand BP-24, with an average degree of polymerization of 2500 and a weight average molecular weight of 124000; polycarboxylate water reducer was purchased from BASF, brand 2651F; glass fiber was Alkali-resistant glass fiber with a length of 15mm and a diameter of 10μm.

[0032] In this example, the VAE powder was purchased from Wacker Company, the brand name is TDS-5044N.

[0033] 100kg containing 0.60% chloride ion hemihydrate titanium gypsum powder (grade is 85%), 65kg water, 1.0kgPVA powder, 0.2kgVAE powder, 30g glass fiber and 0.5kg polycarboxylate water reducer are stirred in mixer, and then Inject 3kg of sodium lauryl sulfate foaming agent through a metering pump, stir evenly to make a slurry; combine the above slurry with upper and lower face protection paper, cut, and finally dry to obtain a 9.5mm thick plasterboard .

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Abstract

The invention discloses a gypsum plaster board. The gypsum plaster board comprises a board core and surface protection paper, wherein the board core comprises dihydrate gypsum formed by hydration of gypsum clinker and polyvinyl alcohol, and the board core does not comprise starch. According to the invention, the polyvinyl alcohol is used for replacing starch, foreign ions are coated or blocked, the interference of the foreign ions on gypsum crystals and the influence of the foreign ions on migration to the surface of the board are inhibited, and then the influence of the foreign ions on the strength of the gypsum board is reduced.

Description

technical field [0001] This article relates to but not limited to a gypsum building material, in particular to but not limited to a method for preparing paper-faced gypsum board from industrial by-product gypsum containing high chloride ions. Background technique [0002] Phosphogypsum is a solid waste produced by wet-process production of phosphoric acid from phosphate rock. Due to factors such as production technology and mineral resources, phosphogypsum contains many different impurity elements, which have an important impact on gypsum products. Soluble impurities such as phosphorus and fluorine can be solidified by using the lime method neutralization process to produce insoluble calcium phosphate and calcium fluoride, but the chloride ions in it cannot produce insoluble salts, so it is difficult to be effectively treated. When the chloride ion content is too much, the product will have various problems such as dampness, sagging, and yellowing, and the strength of the gy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/143C04B28/144C04B28/142C04B2111/0062C04B2201/50C04B2201/10C04B2103/302C04B14/42C04B24/2623C04B24/16C04B38/10C04B2103/0057C04B14/44
Inventor 朱清玮陈红霞杨正波
Owner BEIJING NEW BUILDING MATERIALS PLC
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