A branched mud-suppressing polycarboxylate water reducer, its preparation method and application

A technology of mud polycarboxylate and water reducer, which is applied in the field of branched chain mud-suppressing polycarboxylate water reducer, which can solve the problems of not meeting the high fluidity requirements of concrete, failing to meet the working performance of concrete, and unsatisfactory use effects, etc. , to achieve strong designability, delay hydration and reunion, and facilitate popularization and utilization

Active Publication Date: 2020-12-29
安徽森普新型材料发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are more and more studies on mud-resistant polycarboxylate superplasticizers. Chinese patent CN101708973A discloses a water-retaining and plastic-retaining branched-chain mud-suppressing polycarboxylate superplasticizer and its preparation method. The effect of using in concrete with high powder content is not ideal, and it cannot meet the high fluidity requirements of concrete; Chinese Journal (New Building Materials 2016.8:39-42 on highly adaptable phosphoric acid-based modified polycarboxylate superplasticizer) research , pointing out that phosphoric acid compounds can effectively improve the mud resistance of branched-chain mud-inhibiting polycarboxylate superplasticizers, but the adsorption capacity of phosphoric acid compounds and polycarboxylate superplasticizers with soil is poor, and the mud resistance performance needs to be improved
In summary, it can be found that most of the mud-resistant polycarboxylate superplasticizers in the prior art have the problem of poor mud resistance when dealing with high soil content, and cannot meet the working performance of concrete

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  • A branched mud-suppressing polycarboxylate water reducer, its preparation method and application
  • A branched mud-suppressing polycarboxylate water reducer, its preparation method and application
  • A branched mud-suppressing polycarboxylate water reducer, its preparation method and application

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preparation example Construction

[0025] The invention provides a preparation method of branched-chain mud-suppressing polycarboxylate superplasticizer, the specific steps are as follows:

[0026] Step S1, performing free-radical polymerization of various unsaturated monomers to obtain a copolymer;

[0027] Step S2, introducing an unsaturated monomer with an amino group into the copolymer to perform an ammonia-epoxy reaction to obtain an intermediate;

[0028] Step S3, introducing an unsaturated quaternary phosphorus salt compound into the intermediate to carry out a side chain growth reaction to prepare the branched mud-suppressing polycarboxylate superplasticizer.

[0029] According to the present invention, a copolymer is first synthesized. The various unsaturated monomers include small unsaturated epoxy monomers, small unsaturated ester monomers, small unsaturated sulfonic acid monomers, small unsaturated acid monomers, and unsaturated polyether macromonomers; At normal temperature (25°C), add the variou...

Embodiment 1

[0049] 1.1 At room temperature (25°C), weigh 1 g of the vinyl oxirane, 5 g of the methyl acrylate, 6 g of the allyl sulfonate amine, 5 g of the acrylic acid, and the methallyl Add 30g of alcohol polyoxyethylene ether into the four-necked flask, then add 50g of water and mix evenly; raise the temperature to 75°C, slowly add 21g of the first initiator solution dropwise to the four-necked flask, within 4h at a constant The speed of dropping is completed, and the reaction is continued at 75°C for 2 hours after the dropwise addition to obtain a copolymer;

[0050] 1.2 Add 1 g of the allylamine to the copolymer obtained in step 1.1, and react at 75° C. for 1 hour to obtain an intermediate;

[0051] 1.3 At the temperature above (75°C), add 2 g of the vinyl triphenylphosphine bromide to the intermediate, and then slowly add 5.1 g of the second initiator solution dropwise to the intermediate, the resulting The second initiator solution was dripped at a constant speed within 2 hours; a...

Embodiment 2

[0054] 2.1 At room temperature (25°C), weigh 1 g of the vinyl oxirane, 5 g of the methyl acrylate, 6 g of the allyl sulfonate amine, 5 g of the acrylic acid, and the methallyl Add 30g of alcohol polyoxyethylene ether into the four-necked flask, then add 50g of water and mix evenly; raise the temperature to 75°C, slowly add 21g of the first initiator solution dropwise to the four-necked flask, within 4h at a constant The speed of dropping is completed, and the reaction is continued at 75°C for 2 hours after the dropwise addition to obtain a copolymer;

[0055] 2.2 Add 1 g of the polyallylamine to the copolymer obtained in step 2.1, and react at 75° C. for 1 hour to obtain an intermediate;

[0056] 2.3 At the temperature above (75°C), add 4 g of vinyltriphenylphosphine bromide to the intermediate, and then slowly add 5.1 g of the second initiator solution dropwise to the intermediate, the resulting The second initiator solution was dripped at a constant speed within 2 hours; af...

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Abstract

The invention discloses a branch chain type mud-inhibiting polycarboxylate water reducing agent as well as a preparation method and an application thereof. The branch type mud-inhibiting polycarboxylate water reducing agent is prepared by the following steps: step S1, carrying out free radical polymerization reaction on multiple unsaturated monomers to prepare a copolymer; step S2, introducing anunsaturated monomer with amido to the copolymer to carry out ammonia-epoxy reaction to obtain an intermediate; and step S3, introducing unsaturated quaternary phosphonium into the intermediate for side chain growth reaction to prepare the branch chain type mud-inhibiting polycarboxylate water reducing agent. The preparation of the branch chain type mud-inhibiting polycarboxylate water reducing agent is simple in reaction mechanism, mild in reaction condition, green and environmentally friendly, simple and reliable, wide in raw material source, low in production cost and beneficial to popularization and application. The prepared branch chain type mud-inhibiting polycarboxylate water reducing agent has high mud-inhibiting property, a long branch chain and an obvious anti-mud effect.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a branched-chain mud-suppressing polycarboxylate water reducer, its preparation method and application. Background technique [0002] As a new type of high-performance water-reducing agent, polycarboxylate water-reducing agent is widely used in concrete engineering. It is mainly composed of polycarboxylate and grafted and copolymerized by various high-molecular organic compounds. A variety of excellent properties, it is the most widely used concrete admixture. However, with the change of the building environment, the sand and gravel resources in various places are gradually deteriorating, and the soil content in the sand and gravel is relatively high, and the increase in the soil content is bound to have a great impact on the construction performance of the concrete mixture. Therefore, a mud-resistant polycarboxylate Acid water reducers came into being. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L51/00C08L85/02C08F261/06C08F230/02C08F8/32C08F216/14C08F216/16C08F220/14C08F226/02C08F220/06C04B24/24C04B28/02
Inventor 程从亮张家如傅曹辉张思亮曹吉鑫汪德宝
Owner 安徽森普新型材料发展有限公司
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