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Alpha type hemihydrate gypsum composite waterproof agent

A technology of hemihydrate gypsum and water repellent, which is applied in the field of composite water repellent, can solve the problem of high price, and achieve the effect of improving the waterproof effect, increasing the mechanical properties and good waterproof effect.

Active Publication Date: 2014-03-12
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding an appropriate amount of silicone waterproofing agent can improve the waterproof performance of gypsum products, but as far as the current market price is concerned, the price is still high

Method used

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  • Alpha type hemihydrate gypsum composite waterproof agent
  • Alpha type hemihydrate gypsum composite waterproof agent
  • Alpha type hemihydrate gypsum composite waterproof agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 6kg of acrylate and 3.1kg of vinyl acetate with water, add a small amount of surfactant alkylphenol polyoxyethylene ether, heat up to 50-70°C and stir at high speed for 20-30min, then keep warm for 1-2h; add 6kg of acrylate again , 3.1kg of vinyl acetate and 2.0kg of emulsifier azobisisobutylcyanide, heated to 85°C and stirred for 30-45min, then kept warm for 1-3h, lowered to room temperature and adjusted to pH 7.2-8, filtered to obtain a waterproofing agent Stand by after use. Add the above-mentioned self-made waterproofing agent, 3.3kg of slag powder and 3.8kg of treated straw into water and mix evenly, then add 1000kg of α-type hemihydrate gypsum into it, stir for 2-5min, pour into the mold, and remove the mold after curing. α-type hemihydrate gypsum products.

[0027] The experimental results are as follows:

[0028]

Embodiment 2

[0030] Mix 22.5kg of acrylate, 4kg of vinyl acetate, and 1.5kg of isocyanate with water, add a small amount of surfactant alkylphenol polyoxyethylene ether 1kg, heat up to 50-70°C and stir at high speed for 20-30min, then keep warm for 1-2h; Add 22.5kg of acrylate, 3.5kg of vinyl acetate, 1.3kg of isocyanate and 2.2kg of emulsifier polyvinyl alcohol, heat to 85°C and stir for 30-45min, keep warm for 1-3h, lower to room temperature and adjust pH to 7.2-8 , filter, and prepare the waterproofing agent for later use. Add the above-mentioned self-made waterproofing agent, 4.2kg of slag powder, 2.8kg of fly ash, and 4.5kg of treated straw into water and mix evenly, then add 1000kg of α-type hemihydrate gypsum into it, stir for 2-5min, pour into the mold, and The α-type hemihydrate gypsum product is obtained by curing and demoulding.

[0031] The experimental results are as follows:

[0032]

Embodiment 3

[0034] Mix 3kg of isocyanate and 12kg of vinyl acetate with water, add a small amount of surfactant alkylphenol polyoxyethylene ether 4.5kg, heat up to 50-70°C and stir at high speed for 20-30min, then keep warm for 1-2h; add 3kg of isocyanate again, Vinyl acetate 12kg and emulsifier polyvinyl alcohol 4.2kg, heated to 85°C and stirred for 30-45min, then kept warm for 1-3h, lowered to room temperature and adjusted to pH 7.2-8, filtered to prepare waterproofing agent for use . Add the above self-made waterproofing agent, 7.2kg of slag powder and 3.6kg of fly ash, 2.8kg of treated citrus peel, 2.5kg of sugarcane peel into water and mix evenly, then add 1000kg of α-type hemihydrate gypsum into it, stir for 2-5min and pour Put it into the mold, and make α-type hemihydrate gypsum products after curing and demoulding.

[0035] The experimental results are as follows:

[0036]

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Abstract

The invention discloses an Alpha type hemihydrate gypsum composite waterproof agent. The composite waterproof agent is prepared by using Alpha type hemihydrate gypsum as a fundamental raw material and adding a waterproof agent, a plant fibers and a retarder into the Alpha type hemihydrate gypsum. The composite waterproof agent comprises organic waterproof agents including one or more of acrylic ester, vinyl acetate and isocyanate, and inorganic waterproof agents including one or more of slag powder and flyash, the plant fibers are one or more of wheat straw and fruit peel, and the retarder is citric acid. According to the composite waterproof agent, the waterproof effect is improved, the mechanical property of gypsum products is enhanced, the cost is effectively lowered, the breaking strength is improved by 50% above, and besides, pollution to the environment is reduced.

Description

technical field [0001] The invention relates to a waterproofing agent. Specifically, the waterproofing agent is added to α-type hemihydrate gypsum to obtain a composite waterproofing agent with high-strength waterproofing effect. Background technique [0002] The main component of natural gypsum is CaSO 4 2H 2 O, also known as raw gypsum. Gypsum belongs to the monoclinic crystal system and is easy to crack into thin flakes. Hemihydrate gypsum can be obtained by heating gypsum to 100-200°C and losing part of the crystal water. It is an air-hardening gelling material with two forms of α and β, both of which are rhombohedral crystals, but with different physical properties. β-type hemihydrate gypsum (also known as construction gypsum) is a flaky crystal with cracks, the crystal is very fine, and its specific surface area is much larger than that of α-type hemihydrate gypsum. α-type hemihydrate gypsum products have the characteristics of high strength, good wear resistance,...

Claims

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Application Information

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IPC IPC(8): C04B24/08C04B22/14C04B18/24C04B103/65
CPCY02W30/91
Inventor 黄应平刘立明阮长城黄绪泉
Owner CHINA THREE GORGES UNIV
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