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Method of imparting water repellency to a gypsum-based product formed from a plaster-based composition

A raw gypsum-based, water-repellent treatment technology, applied in the field of manufacturing molded or extruded products such as gypsum bricks or gypsum boards, can solve the problem of reducing the water absorption of gypsum boards

Active Publication Date: 2009-08-05
BPB LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because it has been found that when making plasterboard the native starch traditionally added to the slurry is a partially hydrolyzed native starch which has no significant effect on reducing the water absorption of the plasterboard

Method used

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  • Method of imparting water repellency to a gypsum-based product formed from a plaster-based composition
  • Method of imparting water repellency to a gypsum-based product formed from a plaster-based composition
  • Method of imparting water repellency to a gypsum-based product formed from a plaster-based composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1) Preparation of small plates

[0061] Prepare a powder mixture consisting of the following components (amounts expressed relative to 1 kg of plaster of paris)

[0062] — 1kg of plaster of paris (based on natural raw gypsum)

[0063] - 4.25g guar gum or pregelatinized starch powder

[0064] - 4.7g starch (Collofilm 121, Amylum, Tate & Lyle)

[0065] - 0.05g coagulation retardant (PlastRetard, SICIT)

[0066] This mixture was added to a liquid mixture consisting of 740 g of water, 2.9 g of fluidizer (Proxmat M115-40, Synthron) and silicone oil (H68, Rhodia, France) (for the amount used see Table 1 below).

[0067] Mixing was performed by means of an 8 cm diameter dispersing disc rotating at 1500-2500 rpm.

[0068] During stirring for 1 to 1.5 minutes by means of an 8 cm diameter dispersing disc rotating at 1000 rpm, 52 g of foam were added, prepared by 2 g of blowing agent (Millifoam, Huntsman) in 200 ml of water.

[0069] This mixture was filled into 6 small pla...

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Abstract

The invention relates to a method of imparting water repellency to a gypsum-based product formed from a plaster-based composition, which comprises adding to the said composition at least one compound comprising a polysiloxane and at least one compound comprising a pregelled starch. The invention likewise relates to a hydrophobicized, plaster-based composition comprising a polysiloxane and at least one compound comprising a pregelled starch, and also to its uses.

Description

technical field [0001] The present invention relates to a kind of plaster of paris ( )-based compositions for waterproofing of gypse-based products, plaster-of-paris-based waterproofing compositions, and uses of the compositions for the manufacture of molded or extruded articles such as gypsum bricks or plasterboards. Background technique [0002] The raw gypsum, whether of natural or synthetic origin, is calcium sulfate dihydrate. The powdered form of this raw gypsum is first calcined to dehydrate it to either calcium sulfate hemihydrate or calcium sulfate anhydrous or a mixture of the two forms. The product of this dehydration is called plaster of paris. By mixing this plaster of paris with water a slurry is obtained which solidifies to reform raw gypsum (calcium sulphate dihydrate). An excess of water is used in the slurry in order to obtain a slurry suitable for flow to shape it into the desired product. During the drying process of the product, this excess water is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B24/38C04B24/42C04B111/27
CPCC04B2111/27C04B28/14C04B40/0039C04B24/383C04B24/42
Inventor E·吉拉尔特
Owner BPB LTD
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