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A kind of preparation method of concrete waterproof compacting agent

A waterproof and dense concrete technology, which is applied in the field of building material additive preparation, can solve the problems of reducing concrete strength and waterproof performance, and achieve the effects of enhanced strength and waterproof performance, improved strength and waterproof performance, and stable response

Active Publication Date: 2019-04-02
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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  • A kind of preparation method of concrete waterproof compacting agent

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Effect test

example 1

[0019] First, weigh 400g of glycine and add it to a beaker containing 800mL of water. Move the beaker into a digital thermostat and speed measuring magnetic stirrer. Stir and dissolve at a temperature of 70°C and a speed of 350r / min for 20 minutes to obtain a glycine mixed solution. 500mL glycine mixed solution was added to a three-necked flask with a thermometer and a reflux device, and a 15% sodium hydroxide solution was added to the flask to adjust the pH to 10.5, then the flask was moved into a water bath, and the temperature of the water bath was controlled to 60℃ Then, add 60mL epichlorohydrin dropwise to the flask and control the dropping rate to 5mL / min. After the addition is complete, keep the temperature and stir for 3h. After the reaction is over, add 10% hydrochloric acid to the flask to adjust the contents of the flask. After the pH is 7.5, the product is obtained, and the product is allowed to stand for liquid separation to obtain the lower layer liquid. The lower ...

example 2

[0021] First, weigh 300g of glycine and add it to a beaker containing 700mL of water, move the beaker into a digital constant temperature and speed measuring magnetic stirrer, stir and dissolve at a temperature of 60°C and a rotational speed of 300r / min for 15 minutes to obtain a glycine mixed solution. 400mL glycine mixed solution was added to a three-necked flask with a thermometer and a reflux device, and a 15% sodium hydroxide solution was added to the flask to adjust the pH to 10.2, then the flask was moved into the water bath, and the temperature of the water bath was controlled to 50℃ Then, add 50mL epichlorohydrin dropwise to the flask and control the dropping rate to 3mL / min. After the addition is complete, heat and stir the reaction for 2h. When the reaction is over, add 10% hydrochloric acid to the flask to adjust the contents of the flask. After the pH is 7.3, the product is obtained, and the product is allowed to stand for liquid separation to obtain the lower layer...

example 3

[0023] First, weigh 350g of glycine and add it to a beaker containing 750mL of water. Move the beaker into a digital constant temperature and speed measuring magnetic stirrer. Stir and dissolve at a temperature of 65°C and a speed of 320r / min for 17 minutes to obtain a glycine mixed solution. 450mL of glycine mixed solution was added to a three-necked flask with a thermometer and reflux device, and a 15% sodium hydroxide solution was added to the flask to adjust the pH to 10.3, then the flask was moved into a water bath, and the temperature of the water bath was controlled to 55℃ Then, add 55mL epichlorohydrin dropwise to the flask and control the dropping rate to 4mL / min. After the addition is complete, heat and stir the reaction for 2h. When the reaction is over, add 10% hydrochloric acid to the flask to adjust the contents of the flask. After the pH is 7.4, the product is obtained, and the product is left for liquid separation to obtain the lower layer liquid. The lower layer...

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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 method for preparing a concrete waterproof compacting agent, and belongs to the technical field of building material additives preparation. Background technique [0002] As the cement hydration progresses during the concrete hardening process, the internal moisture is consumed by the hydration reaction, and a large number of connected capillary pores are formed at the aggregate-mortar interface of the hardened concrete; the concrete will shrink in volume during the drying process. Constrained by the cracking phenomenon of concrete, it has aggravated the damage of its leakage. The addition of waterproof compaction agent in the concrete mixing process can improve the impermeability and crack resistance of hardened concrete, so it is important for development engineering applications effect. [0003] At present, the commonly used waterproof compacting agents in China mainly include higher fatty acids, triethanolamine, and ferric chlor...

Claims

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Application Information

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Patent Type & Authority Patents(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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