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Organosilane emulsion type gypsum waterproofing agent and preparation method thereof

A technology of organosilane and waterproofing agent, which is applied in the field of organosilane emulsion type gypsum waterproofing agent and its preparation, which can solve the problems of strong influence of gypsum, strong alkalinity, high content of sodium oxide, etc., and achieve excellent water repelling effect and enhanced strength

Inactive Publication Date: 2018-11-02
NANXIONG DING CHENG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Sodium methyl silicate and potassium methyl silicate are water-soluble silanes, which are good waterproofing agents for gypsum, but the content of sodium oxide is high and the alkalinity is strong. Operators need to wear protective gloves and protective glasses, and they also have a certain impact on the strength of gypsum.

Method used

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  • Organosilane emulsion type gypsum waterproofing agent and preparation method thereof
  • Organosilane emulsion type gypsum waterproofing agent and preparation method thereof
  • Organosilane emulsion type gypsum waterproofing agent and preparation method thereof

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preparation example Construction

[0015] A preparation method of organosilane emulsion type gypsum waterproofing agent, the steps are:

[0016] In a 1000ml plastic cylinder, add methyltriethoxysilane and mixed alkyl alcohol polyoxyethylene ether emulsifier, in a high-speed shear homogenizer, the speed is 5000-10000rpm, slowly add water, when the water is added, the oil and water are mixed The liquid becomes thicker, and with the addition of water, the emulsion slowly becomes thinner. After adding water, it is then sheared at high speed for 5 minutes to obtain a water repellent emulsion with a mass percentage of 30%.

[0017] The HLB value of the mixed alkyl alcohol polyoxyethylene ether is 11.0.

Embodiment 1

[0018] Example 1: In a 1000ml plastic cylinder, 150 grams of methyltriethoxysilane was added, and a total of 6 grams of alkyl alcohol polyoxyethylene ether emulsifier (the HLB value of the mixed alcohol ether was 11.0) was mixed. In the carburetor, the speed is 5000-10000rpm, slowly add 350 grams of water, the oil-water mixture becomes thicker when water is added, and the emulsion slowly becomes thinner with the addition of water, after adding water, and then high-speed shearing for 5 minutes, to obtain 500 grams of 30% oil-in-water emulsion is tested by a laser particle size tester. The particle size is within 0-3um, the average particle size is about 1um, and the centrifugal stability test is qualified. There is no change in the heat stability test at 40°C for 28 days, and there is no change in the 5°C low temperature room stability test for 28 days. Adding 5% calcium chloride solution produced no precipitation.

[0019] Embodiment two to five, change the amount of emulsifi...

Embodiment 11

[0031] Embodiment 11: Change the order of addition. In the above embodiments 1 to 10, the silane and emulsifier are first mixed together to form an oil phase, and water is slowly added to the oil phase under high-speed shearing to form an oil-in-water emulsion. If the emulsifier is mixed with water first, the oil-in-water emulsion can also be obtained by slowly adding the silane oil phase to the water phase under high shear. The stability is the same as the emulsion obtained by adding water to oil. Similarly, when the amount of emulsifier is less than 2%, a stable emulsion cannot be obtained, and when the oil phase is added to water, even if the HLB value of the emulsifier is lower than 10, an oil-in-water emulsion can be obtained. If water is added to the oil phase, such as HLB value ≤ 10, only water-in-oil emulsion can be obtained, which is not well dispersed in water.

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Abstract

The invention relates to an organosilane emulsion type gypsum waterproofing agent, which takes alkyl alkoxy silane as main component and mixed alkyl alcohol polyoxy ethylene ether as an emulsifier, which are emulsified by a high-shearing emulsifying machine to obtain oil-in-water emulsion type gypsum waterproofing agent, the waterproofing agent can be evenly dispersed into the fine pores of gypsumproducts, which makes the gypsum products permeable and waterproof, and have good water-repellent effect, the contact angle of water droplets on gypsum surface is 150 degree or above, and the water droplets are not absorbed by gypsum body for a long time, the water absorption rate reaches the standard of gypsum board stipulated by the state, and the strength is greatly improved especially after being wetted by soaking in water.

Description

technical field [0001] The invention belongs to the technical field of waterproofing agent formulations, and relates to an organosilane emulsion type gypsum waterproofing agent and a preparation method thereof. Background technique [0002] Gypsum products are products made of calcium sulfate hemihydrate, which is converted into calcium sulfate dihydrate and solidified into various shapes after adding water. Mainly used in building materials and interior decoration materials such as: partition walls, wall tiles, also used in ceilings and artworks. The quality of gypsum products is much lighter than that of cement products, and it is one of the main building materials for sound insulation, heat insulation and fire prevention. But the biggest disadvantage is poor water resistance, easy to absorb water and moisture, large strength loss after water absorption, brittle, large deformation after moisture absorption, which limits its use. [0003] The earliest people used paraffin...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B103/65
CPCC04B40/0039C04B2103/65C04B24/42C04B24/32C04B22/002
Inventor 周宇鹏周涛
Owner NANXIONG DING CHENG NEW MATERIAL TECH CO LTD
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