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Preparation method of waterproof compacting agent for concrete

A waterproof and dense concrete technology, applied in the field of building material additive preparation, can solve the problems of reducing waterproof performance, reducing concrete strength, etc., to achieve the effect of improving strength and waterproofing, enhancing strength and waterproofing performance, and reducing the path of water flow

Active Publication Date: 2017-08-08
深圳市五山新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the problem that the traditional concrete waterproof compacting agent reduces the strength of concrete with the increase of the mixing amount, and the waterproof performance decreases in the case of long-term immersion, a concrete waterproof compacting agent is provided preparation method

Method used

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  • Preparation method of waterproof compacting agent for concrete

Examples

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Effect test

example 1

[0019] First weigh 400g of glycine and add it to a beaker containing 800mL of water, then move the beaker into a magnetic stirrer with a digital display constant temperature and speed measurement, stir and dissolve for 20min at a temperature of 70°C and a speed of 350r / min to obtain a glycine solution, take 500mL Add the glycine solution into a three-neck flask with a thermometer and a reflux device, and add a 15% sodium hydroxide solution to the flask to adjust the pH to 10.5, then move the flask into a water bath, and control the temperature of the water bath to 60°C. Add 60mL of epichlorohydrin dropwise to the flask, and control the rate of addition to 5mL / min. After the dropwise addition is completed, heat and stir the reaction for 3 hours. After the reaction is completed, add 10% hydrochloric acid to the flask to adjust the pH of the material in the flask to After 7.5, the product was obtained, and the product was left to separate liquids to obtain the lower layer liquid. ...

example 2

[0021] First weigh 300g of glycine and add it to a beaker containing 700mL of water, then move the beaker into a magnetic stirrer with a digital display constant temperature and speed measurement, stir and dissolve for 15min at a temperature of 60°C and a speed of 300r / min to obtain a glycine solution, take 400mL Add the glycine solution into a three-neck flask with a thermometer and a reflux device, and add a mass fraction of 15% sodium hydroxide solution to the flask to adjust the pH to 10.2, then move the flask into a water bath, and control the temperature of the water bath to 50°C. Add 50mL of epichlorohydrin dropwise to the flask, and control the rate of addition to 3mL / min. After the dropwise addition is completed, heat and stir the reaction for 2 hours. After the reaction is completed, add 10% hydrochloric acid to the flask to adjust the pH of the material in the flask to After 7.3, the product is obtained, and the product is left to separate liquids to obtain the lower...

example 3

[0023]First weigh 350g of glycine and add it to a beaker containing 750mL of water, then move the beaker into a magnetic stirrer with a digital display constant temperature and speed measurement, stir and dissolve for 17min at a temperature of 65°C and a speed of 320r / min to obtain a glycine solution, take 450mL Add the glycine solution into a three-necked flask with a thermometer and a reflux device, and add a mass fraction of 15% sodium hydroxide solution to the flask to adjust the pH to 10.3, then move the flask into a water bath, and control the temperature of the water bath to 55°C. Add 55mL of epichlorohydrin dropwise to the flask, and control the rate of addition to 4mL / min. After the dropwise addition is complete, heat and stir the reaction for 2 hours. After the reaction is completed, add 10% hydrochloric acid to the flask to adjust the pH of the material in the flask to After 7.4, the product was obtained, and the product was left to separate liquids to obtain the low...

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Abstract

The invention relates to a preparation method of a waterproof compacting agent for concrete, and belongs to the technical field of preparation of additives of building materials. According to the preparation method, carboxyl-containing glycine serves as a raw material; the glycine is subjected to epoxy modification under alkaline conditions, and the number of active groups of the modified glycine can be increased; the modified glycine, serving as a complexing agent, reacts with calcium carbonate to generate a soluble calcium complex; the calcium complex can diffuse into the concrete spontaneously along with water, and reacts with silicate in the cement to generate insoluble crystals, and the effects that the strength and waterproofness of the concrete are enhanced while concrete gaps are filled are achieved; and the complexing agent is capable of circularly reacting, lithium silicate can react with free calcium in the cement to generate pectolite gelatin to fill the concrete gaps, and the strength and waterproofness of the concrete are improved. The waterproof concrete compacting agent prepared through the preparation method is good in waterproofness, the strength of the concrete is not prone to being reduced, fracturing is not prone to occurring in the use process, and the preparation method has wide application prospects.

Description

technical field [0001] The invention relates to a preparation method of a concrete waterproof compacting agent, belonging to the technical field of preparation of building material additives. Background technique [0002] During the hardening process of concrete, as the cement hydration proceeds, the internal moisture is consumed by the hydration reaction, and a large number of connected capillary pores are formed at the aggregate-slurry interface of hardened concrete; during the drying process, the concrete will shrink in volume, due to Constrained by the fact that concrete is prone to cracking, the danger of leakage is exacerbated. Adding a waterproof compacting agent during concrete mixing can improve the impermeability and crack resistance of hardened concrete, so it is of great importance to the development of engineering applications. effect. [0003] At present, the commonly used waterproof compacting agents in China mainly include higher fatty acids, triethanolamine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B103/65
CPCC04B40/0046C04B2103/65C04B24/123C04B22/10C04B12/04C04B22/06
Inventor 吴迪薛洋王维
Owner 深圳市五山新材料股份有限公司
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