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A kind of polycarboxylate water reducing agent and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer and its preparation, can solve the problems of low conversion rate of monomers, mismatching of conversion rate, slow speed, etc., and achieve good slump retention and avoid The effect of partial explosion and improvement of working status

Active Publication Date: 2022-06-28
JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems caused by the self-polymerization of acrylic acid monomers occurring at the same time, the slow polymerization rate, and the mismatching ratio between monomers in the prior art when preparing the water reducing agent. Low bulk conversion rate, and the need to heat or cool down to control the polymerization reaction temperature and other defects, thereby providing a polycarboxylate water reducer and its preparation method

Method used

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  • A kind of polycarboxylate water reducing agent and preparation method thereof
  • A kind of polycarboxylate water reducing agent and preparation method thereof
  • A kind of polycarboxylate water reducing agent and preparation method thereof

Examples

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Embodiment 1

[0041] The present embodiment provides a preparation method of a polycarboxylate water reducer, comprising the following steps:

[0042] (1) get 100g ethylene glycol monovinyl ether and 0.25g sodium hydroxide and join in the autoclave, after replacing three times with nitrogen, turn on stirring, the temperature in the reactor is warming up to 110 ℃, begin to pass into the reactor 160 g of propylene oxide, aged for 1 h, after the reaction was completed, 2000 g of ethylene oxide was added to the reaction kettle, and the aged reaction was carried out for 1 h. After the reaction of ethylene oxide was completed, the temperature in the reaction kettle was lowered to 90 °C, acetic acid was added, and the process was in progress. and reaction, the pH of the product is adjusted to 6-7 to obtain hydroxyethyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether with a molecular weight of 2000; wherein, ethylene oxide and propylene oxide are added to the in the reactor.

[...

Embodiment 2

[0046] The present embodiment provides a preparation method of a polycarboxylate water reducer, comprising the following steps:

[0047] (1) get 120g diethylene glycol monovinyl ether and 0.18g sodium hydroxide and join in the autoclave, after replacing three times with nitrogen, turn on stirring, the temperature in the reactor is warming up to 110 ℃, begin to pass through in the reactor 120g of propylene oxide was put in, and the reaction was carried out for 1 hour. After the reaction of propylene oxide was completed, 4000g of ethylene oxide was added to the reaction kettle, and the reaction was carried out for 1 hour. Acetic acid is neutralized, and the pH of the product is adjusted to 6-7 to obtain hydroxyethyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether with a molecular weight of 3000; wherein, ethylene oxide and propylene oxide are in the anaerobic state. added to the reactor under conditions.

[0048] (2) get 35g acrylic acid, 0.3g mercaptopropion...

Embodiment 3

[0051] The present embodiment provides a preparation method of a polycarboxylate water reducer, comprising the following steps:

[0052] (1) get 180g ethylene glycol monovinyl ether and 0.18g sodium hydroxide and join in the autoclave, after replacing three times with nitrogen, turn on stirring, the temperature in the reactor is warming up to 110 ℃, begin to pass into the reactor 570g propylene oxide, ripening reaction for 1h, after the propylene oxide reaction is complete, add 4000g ethylene oxide to the reaction kettle, and ripen for 1h, after the ethylene oxide reaction is complete, reduce the temperature in the reaction kettle to 90 ℃, add acetic acid , carry out the neutralization reaction, the pH of the product is adjusted to 6-7, and the hydroxyethyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether is obtained with a molecular weight of 2200; wherein, ethylene oxide and propylene oxide are in anaerobic conditions added to the reactor.

[0053] (2) get...

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Abstract

The invention belongs to the technical field of concrete admixture preparation, and in particular relates to a polycarboxylate water reducer and a preparation method thereof. The method comprises (1) preparing hydroxyethyl-terminated vinyl polyoxypropylene polyoxyethylene ether; (2) preparing polycarboxylate water reducer; the double-ended vinyl ether small monomers contain alkoxy groups and Contains double bonds; preferably, the vinyl ether monomer is ethylene glycol divinyl ether and / or diethylene glycol divinyl ether. The content of ultra-high molecular weight copolymer in the polycarboxylate water reducer prepared by the method is reduced, the relative molecular weight distribution is normal distribution, the molecular weight distribution is narrow, and there are almost no strong polar ultra-high molecular weight by-products; The reaction rate is controllable, the heat release is mild and stable, avoiding the local detonation phenomenon caused by high temperature during the polymerization reaction, and the monomer conversion rate can be increased to more than 95%.

Description

technical field [0001] The invention belongs to the technical field of concrete admixture preparation, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete has become the basis of human life and is currently the most widely used building material. Concrete admixture is the fifth component in concrete besides cement, sand, stone and water, and plays a very important role in the application of high performance concrete. As a kind of concrete admixture, water reducing agent, also known as superplasticizer (Superplasticizer), can reduce the mixing water consumption and improve the strength of concrete under the condition that the workability of concrete and the amount of cement remain unchanged, and become a concrete admixture. Field research hotspots and development priorities. The water reducing agent hinders or destroys the flocculation structure of cement particles through surface activity, complexation, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F216/12C08F220/06C08G65/26C04B24/26C04B103/30
CPCC08F283/065C08G65/2609C04B24/2694C04B2103/302C08F216/125C08F220/06
Inventor 何新耀仝浩胜李玉博
Owner JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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