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Mud-resistant polycarboxylic acid water reducer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, applied in the field of concrete water reducing agent, can solve the problems of loss of steric hindrance ability and deactivation, and achieve the effects of easy to enlarge and control production, low equipment requirements and low polymerization temperature

Active Publication Date: 2014-01-15
SICHUAN TONGZHOU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars and industry experts at home and abroad have done a lot of work on this, and now they have come to a more consistent conclusion that the mud composition structure in fine aggregate is similar to the multi-layer structure of montmorillonite, while polycarboxylic acid has a longer branched chain , the intercalation effect of simultaneous physical and chemical reactions between these branched chains and the layer of soil occurs, thus losing the steric hindrance ability and leading to deactivation
[0005] According to these mechanisms, some experts have carried out some experiments to polymerize carboxylic acid with short-chain branches without hydrophilic ethylene oxide, and investigate the adsorption capacity and intercalation effect of montmorillonite, although it is proved from the data of adsorption curve The correctness of this theory is confirmed, but polycarboxylic acid mainly relies on the steric effect of long-chain branches to disperse cement particles. , the water solubility of polycarboxylate and the adaptability to cement have big problems

Method used

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  • Mud-resistant polycarboxylic acid water reducer and preparation method thereof
  • Mud-resistant polycarboxylic acid water reducer and preparation method thereof
  • Mud-resistant polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A polycarboxylic acid anti-mud superplasticizer, which is made of the following component raw materials, and the weight ratio of each component is:

[0026]

[0027] The component R is maleic anhydride;

[0028] The R 1 for acrylic acid;

[0029] The R 2 It is a hanging block.

[0030] The allyl polyoxyethylene polyoxypropylene ether is allyl polyoxyethylene polyoxypropylene ether; the chain transfer agent is thioglycolic acid; the initiator R 3 for ammonium persulfate.

[0031] The molecular weight of the said allyl polyoxyethylene polyoxypropylene ether is 1000.

[0032] A kind of preparation method of described polycarboxylate anti-mud superplasticizer, it comprises the following steps:

[0033] S1, weigh raw materials according to the above formula;

[0034] S2. Put the weighed allyl polyoxyethylene polyoxypropylene ether and component R into the reaction kettle, add 120g of water, start stirring, slowly raise the temperature to 35-45°C, and configure all ...

Embodiment 2

[0039] A polycarboxylic acid anti-mud superplasticizer, which is made of the following component raw materials, and the weight ratio of each component is:

[0040]

[0041] The component R is 5g sodium methacrylate and 11g fumaric acid;

[0042] The R 1 for acrylic acid;

[0043] The R 2 for ascorbic acid.

[0044] The allyl polyoxyethylene polyoxypropylene ether is methacrylic polyoxyethylene polyoxypropylene ether; the chain transfer agent is mercaptopropionic acid; initiator R 3 2-5g content of 27.5% hydrogen peroxide.

[0045] The molecular weight of the said allyl polyoxyethylene polyoxypropylene ether is 2000.

[0046] A kind of preparation method of described polycarboxylate anti-mud superplasticizer, it comprises the following steps:

[0047] S1, weigh raw materials according to the above formula;

[0048]S2. Put the weighed allyl polyoxyethylene polyoxypropylene ether and component R into the reaction kettle, add 120g of water, start stirring, slowly raise t...

Embodiment 3

[0053] A polycarboxylic acid anti-mud superplasticizer, which is made of the following component raw materials, and the weight ratio of each component is:

[0054]

[0055] Described component R is 12g maleic anhydride and 6g vinyl acetate;

[0056] The R 1 for acrylic acid;

[0057] The R 2 It is a hanging block.

[0058] The allyl polyoxyethylene polyoxypropylene ether is methyl butylene polyoxyethylene polyoxypropylene ether; the chain transfer agent is a mixture of 0.5g mercaptoacetic acid and 0.5g mercaptopropionic acid; initiator R 3 3~7g of 27.5% hydrogen peroxide.

[0059] The molecular weight of the said allyl polyoxyethylene polyoxypropylene ether is 2400.

[0060] A kind of preparation method of described polycarboxylate anti-mud superplasticizer, it comprises the following steps:

[0061] S1, weigh raw materials according to the above formula;

[0062] S2. Put the weighed allyl polyoxyethylene polyoxypropylene ether and component R into the reaction kettl...

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Abstract

The invention discloses a mud-resistant polycarboxylic acid water reducer which is prepared from the following components: allyl polyoxyethylene polyoxypropylene ether, components R, R1 and R2, a chain transfer agent, an initiating agent R3 and water, wherein the component R is one or more of maleic anhydride, sodium methallyl sulfonate, vinyl acetate, itaconic acid, itaconic anhydride and fumaric acid; R1 is one or a mixture of two of acrylic acid and methylacrylic acid; R2 is one or more of ascorbic acid, sodium formaldehyde sulfoxylate, ferrous sulfate, tin sulfate, sodium hypophosphite, sodium hydrogen sulfite and oxalic acid. The invention further discloses a preparation method for the mud-resistant polycarboxylic acid water reducer. The mud-resistant polycarboxylic acid water reducer has the following benefits: the water solubility and the steric hindrance of polycarboxylic acid are effectively kept; a large amount of non-hydrophilic structures on branch chains can be used for effectively preventing soil interlayer adsorption, so that the adsorption speed and effect are greatly reduced and the mud-resistant purpose is achieved.

Description

technical field [0001] The invention relates to the technical field of concrete water reducers, in particular to a polycarboxylic acid anti-mud water reducer and a preparation method thereof. Background technique [0002] With the rapid development of my country's economic construction, the use of concrete is increasing at a rate of more than ten percent per year, and the level of concrete application technology is also constantly developing. The continuous improvement of the use of polycarboxylate superplasticizer instead. The use of polycarboxylate superplasticizers to configure high-performance concrete has become a trend in the development of concrete. Polycarboxylate superplasticizers are used in high-speed railways, water conservancy and hydropower, drinking Points, highways, harbor terminals and various projects. [0003] Although the polycarboxylate superplasticizer has many advantages, it is greatly affected by the fine aggregate in concrete, that is, the mud cont...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B103/30
Inventor 杨俊舒豆豆何年
Owner SICHUAN TONGZHOU CHEM TECH
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