Special powder water-proofing agent for gypsum

A technology of waterproofing agent and powder, which is applied in the field of waterproofing agent, can solve the problems of unusable and other problems, and achieve the effect of increasing hydrophobicity, simple formula and wide source of raw materials

Active Publication Date: 2014-07-16
广东龙湖科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rise of dry powder mortar in China, gypsum-based dry powder mortar is also gradually entering the market. Although adding water-emulsion waterproofing agent to gypsum can achieve a good waterproof effect, because the water-emulsion waterproofing agent is liquid, it cannot be used for dry powder. Mortar, therefore, to find a waterproof agent that has good waterproof performance, does not affect the decoration of gypsum materials, and is suitable for dry powder mortar is a subject that those skilled in the art are dedicated to researching.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Formula (weight ratio)

[0016] Potassium methyl silicate 30%

[0017] Calcined SiO 2 Diatomaceous earth with a content of more than 90% 20%

[0018] Fumed silica with a particle size of 1500 mesh 45%

[0019] Particle size greater than 200 mesh metakaolin 5%

[0020] 2. Performance test

[0021] According to the weight ratio in the above table, stir each component evenly to prepare a powdery waterproof agent, add it to the gypsum powder at a weight ratio of 4.0%, add 60% of the water according to the weight of the gypsum powder, and mix it evenly to make a block. JC / T698-1998 "Gypsum Block" standard for waterproof performance testing, the measured results are as follows:

[0022] Test items blank block Blocks with 4.0% waterproofing agent added 2 hours water absorption 34% 13% 24 hours water absorption 41% 22% Softening coefficient 0.32 0.56

[0023] It can be seen from the above test results that the water absorption rate...

Embodiment 2

[0025] 1. Formula (weight ratio)

[0026] Hydrogen silicone oil 25%

[0027] Calcined SiO 2 Diatomaceous earth with a content of more than 90% 25%

[0028] Precipitated silica with a particle size of 800 mesh 40%

[0029] Particle size greater than 200 mesh metakaolin 10%

[0030] 2. Performance test

[0031] According to the weight ratio in the above table, mix each component evenly to prepare a powdered waterproofing agent, add it to the gypsum powder at a weight ratio of 2%, add 60% of the water according to the weight of the gypsum powder, and mix it evenly to make a block. JC / T698-1998 "Gypsum Block" standard for waterproof performance testing, the measured results are as follows:

[0032] Test items blank block Blocks with 2.0% waterproofing agent added 2 hours water absorption 34% 6% 24 hours water absorption 41% 10% Softening coefficient 0.32 0.76

[0033] It can be seen from the above test results that the water absorption r...

Embodiment 3

[0035] 1. Formula

[0036] Mixture of isooctyltriethylsilane and isooctyltriethoxysilane 20%

[0037] Calcined SiO 2 Diatomaceous earth with a content of more than 90% 30%

[0038] Precipitated silica with a particle size of 500 mesh 40%

[0039] Particle size greater than 200 mesh metakaolin 10%

[0040] 2. Performance test

[0041] According to the mass ratio in the above table, stir each component evenly to prepare a powdery waterproof agent, add it to the gypsum powder at a weight ratio of 4.0%, add water that is 60% of the weight of the gypsum powder, and mix it evenly to make a block. JC / T698-1998 "Gypsum Block" standard for waterproof performance testing, the measured results are as follows:

[0042] Test items blank block Blocks with 4.0% waterproofing agent added 2 hours water absorption 34% 9% 24 hours water absorption 41% 14% Softening coefficient 0.32 0.63

[0043] It can be seen from the above test results that the water...

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Abstract

The invention provides a special powder water-proofing agent for gypsum, which can obviously improve the hydrophobic property of a gypsum base material and is suitable for dry-mixed mortar. The powder water-proofing agent comprises the following components by weight percent: 15-30% of organic silicon polymer, 20-30% of kieselguhr, 30-50% of white carbon black and 5-10% of kaolin; the organic silicon polymer is one or few of methyl silicate, organic silane or organic siloxane, and the kieselguhr contains more than 90% of SiO2. According to the special powder water-proofing agent for gypsum, the organic silicon polymer is adsorbed by a porous high-purity silicon material, on the premise that the activity of the organic silicon polymer is guaranteed, the organic silicon polymer can be well dispersed and stored; the water-proofing agent has a simple formula, has wide source of feed, needs no complicated preparation technologies, can obviously improve the hydrophobicity of the gypsum material and the softening coefficient of the gypsum, has the advantages of small using amount and good water resistance, and is particularly suitable for the dry-mixed mortar of the gypsum base material.

Description

technical field [0001] The invention relates to a waterproofing agent, in particular to a waterproofing agent which can significantly improve the hydrophobicity of a gypsum substrate, and more particularly relates to a special gypsum which can significantly improve the hydrophobicity of a gypsum substrate and is suitable for use in dry powder mortar. Powder water repellent. Background technique [0002] Gypsum is an air-hardening material, which has the advantages of fast setting and hardening, good fire resistance, good decoration, and certain temperature and humidity regulation effects, and is widely used in the building material industry. However, a fatal weakness of gypsum materials is poor water resistance. Usually, it has strong hygroscopicity and water absorption. After absorbing water, the strength loss can reach 70%, and it is prone to warping and deformation. This limits the application range of gypsum materials to a certain extent. Therefore, the research on wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B103/65
Inventor 王东李英丁洪永顺
Owner 广东龙湖科技股份有限公司
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