Crosslinking type polycarboxylic acid water reducing agent and preparation method thereof

A polycarboxylic acid, cross-linked technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of difficult control of polymerization speed, poor product stability, high equipment requirements, etc., to avoid local explosion Polymerization, excellent workability, and good wrapping effect

Pending Publication Date: 2022-07-12
JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, the technical problem to be solved by the present invention is to overcome that the hydroxyalkyl-terminated vinyl polyoxyethylene ether polycarboxylate superplasticizer with excellent performance in the prior art needs to be prepared under low temperature conditions, which requires high equipment requirements and high energy consumption. , can not have the problems of high water reducing rate and slump loss; and, in the prior art, the polymerization speed is difficult to control in the process of preparing cross-linked polycarboxylate water reducer, and the product stability is poor. Thereby providing a kind of cross-linked polycarboxylate water reducer and preparation method thereof

Method used

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  • Crosslinking type polycarboxylic acid water reducing agent and preparation method thereof
  • Crosslinking type polycarboxylic acid water reducing agent and preparation method thereof
  • Crosslinking type polycarboxylic acid water reducing agent and preparation method thereof

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preparation example Construction

[0067] The specific embodiment provides a preparation method of a cross-linked polycarboxylate water reducer, comprising the following steps:

[0068] (1) Preparation of hydroxyalkyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether

[0069] Take unsaturated alcohol as the starting agent, put it into the autoclave, add alkali catalyst to mix, pass nitrogen to replace, add propylene oxide in an oxygen-free environment to control the reaction temperature to be 100-130 ° C, after the reaction is complete Add ethylene oxide, after the reaction of ethylene oxide is complete, the reaction kettle is cooled down, acid is added to neutralize the reaction, and the pH is adjusted to 6-7 to obtain hydroxyalkyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether.

[0070] (2) Preparation of trimethylolpropane polyoxyethylene polyoxypropylene ether triacrylate

[0071] (1) in the reaction kettle, add trihydroxypropane and alkali catalyst, replace the air in ...

Embodiment 1

[0076] This embodiment provides a cross-linked polycarboxylate water reducer and a preparation method thereof. The preparation method includes the following steps:

[0077] (1) Preparation of hydroxyalkyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether

[0078]100g of ethylene glycol monovinyl ether and 0.25g of sodium hydroxide were added to the autoclave, and after three times of nitrogen replacement, stirring was started, and the temperature of the reactor was raised to 110°C, and 160g of ring was fed into the reactor under an oxygen-free environment. Oxypropane, ripening reaction for 1h, after the reaction is complete, add 2000g of ethylene oxide to the reaction kettle, and ripen for 1h. After the reaction of ethylene oxide is complete, the reaction kettle is cooled to 90 ℃, and acetic acid is added to carry out the neutralization reaction. The pH reaches 6-7 to obtain hydroxyalkyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether with a...

Embodiment 2

[0086] This embodiment provides a cross-linked polycarboxylate water reducer and a preparation method thereof. The preparation method includes the following steps:

[0087] (1) Preparation of hydroxyalkyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether

[0088] Take 100g of ethylene glycol monovinyl ether and 0.25g of sodium hydroxide and add it to the autoclave. After replacing it with nitrogen three times, start stirring. Propane, ripening reaction for 1h, after the reaction is complete, add 2000g of ethylene oxide to the reaction kettle, and ripen for 1h, after the reaction of ethylene oxide is complete, reduce the temperature in the reaction kettle to 90 ℃, add acetic acid, and carry out the neutralization reaction, The pH of the product is adjusted to 6-7 to obtain hydroxyethyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether with an average molecular weight of 2000; wherein, ethylene oxide and propylene oxide are added to the reaction...

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Abstract

The invention belongs to the technical field of preparation of concrete admixtures, and particularly relates to a cross-linked polycarboxylic acid water reducer and a preparation method thereof. The method comprises the following steps: (1) preparing hydroxyalkyl vinyl-terminated polyoxypropylene polyoxyethylene ether; (2) preparing trimethylolpropane polyoxyethylene polyoxypropylene ether triacrylate; and (3) carrying out free radical polymerization reaction on the hydroxyalkyl-terminated vinyl polyoxypropylene polyoxyethylene ether and trimethylolpropane polyoxyethylene polyoxypropylene ether triacrylate to prepare the cross-linking type polycarboxylic acid water reducing agent. In the polymerization process, the reaction rate is controllable, heat release is mild and stable, the phenomena of local implosion and the like caused by high temperature in the polymerization reaction process are avoided, the reaction speed can be stably controlled, and the polycarboxylic acid water reducer with high water reducing rate, high slump retention, good wrapping property and excellent workability is obtained under the condition of normal temperature. And moreover, the preparation method of the water reducing agent is suitable for most production lines.

Description

technical field [0001] The invention belongs to the technical field of concrete admixture preparation, in particular to a cross-linked polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Water reducing agent (also known as superplasticizer, Superplasticizer) is one of the most used concrete admixtures. Its main function is to hinder or destroy cement through surface activity, complexation, electrostatic repulsion or steric repulsion. The flocculation structure of particles can greatly improve the workability and fluidity of concrete, and achieve the effect of saving cement consumption, reducing concrete mixing water consumption and improving concrete strength. As the third generation of water reducing agent, polycarboxylate superplasticizer has quickly occupied most of the market due to its advantages such as low dosage, high water reducing rate, great freedom in molecular structure design and environmental friendliness, and is widel...

Claims

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Application Information

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IPC IPC(8): C08F299/02C04B24/26C04B103/30
CPCC08F299/026C04B24/2605C04B2103/302Y02W30/91
Inventor 何新耀李亚杰房福贤李玉博
Owner JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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