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Polycarboxylic slump retaining agent and its preparation method

A technology of polycarboxylic acid and slump-retaining agent, which is applied in the field of polycarboxylate slump-retaining agent and its preparation, can solve the problems of large slump loss, achieve the effects of reducing adsorption capacity, improving production efficiency, and broadening the application range

Active Publication Date: 2014-03-19
江苏诚意工程技术研究院有限公司
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  • Claims
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a polycarboxylate slump-retaining agent and its preparation method in view of the above-mentioned prior art, so as to overcome the problem of large slump loss caused by the incompatibility between the existing polycarboxylate water-reducing agent and cement

Method used

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  • Polycarboxylic slump retaining agent and its preparation method
  • Polycarboxylic slump retaining agent and its preparation method
  • Polycarboxylic slump retaining agent and its preparation method

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Embodiment 1-12

[0034] Embodiment matching is as shown in table 1, and concrete implementation process is as follows:

[0035] 1) Stir and dissolve polyether macromonomer, styrene, monomethyl maleic anhydride, and hydroxyethyl acrylate to obtain a uniform solution, then add an oxidant, and stir to obtain a uniform solution.

[0036] 2) To the homogeneous solution obtained in step 1), add reducing agent and chain transfer agent mixture at one time, and continue to stir for 3.0 hours, then adjust the pH to neutral, add appropriate deionized water, and obtain 40% concentration of poly Carboxylic acid superplasticizer.

[0037] Among them, the polyether macromonomer is polyoxyethylene ether embedded in propylene oxide, and its molecular structure is as follows:

[0038]

[0039] The preparation process is as follows: prenyl alcohol ( ) and sodium methoxide in an airtight container, stir and mix evenly, and add ethylene oxide evenly, and finish adding in 2 hours; when ethylene oxide is added...

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Abstract

The invention relates to a polycarboxylic slump retaining agent and its preparation method. With a molecular weight of 15000-45000, the polycarboxylic slump retaining agent has a structural general formula shown as the following formula I, wherein a ranges from 2 to 15, b ranges from 2 to 10, c ranges from 2 to 10, and d ranges from 2 to 10. The polycarboxylic slump retaining agent provided by the invention mainly has the advantages that: 1. it can maintain the fluidity with no loss or even increase within 2h, and it can make the concrete slump loss very low after applying in concrete; 2. regulation between the dispersion property and ageing retainability of a polycarboxylic water reducing agent can be realized; and 3. the preparation process involved in the invention adopts a one-step technique and one-time feeding, the process needs no dropwise adding or heating, overcomes the defect of high temperature synthesis in traditional admixture preparation processes, the reaction period is short, the production efficiency is improved to a great extent, and the production cost is reduced, so that the application range of the polycarboxylic water reducing agent is broadened.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a polycarboxylic acid slump retaining agent and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is a high-performance concrete admixture developed in the last ten years. It has been widely used in various concrete projects due to its excellent dispersion and dispersion retention, and has achieved good results. However, in the actual application process, there are also some problems, such as excessive slump loss and poor adaptability, which to a certain extent restrict the promotion of polycarboxylate superplasticizers and also affect the quality of the project. [0003] In view of the rapid loss of concrete slump, the existing slump protection methods mainly include the following three methods: (1) Compound retarder; (2) Adding water reducer twice or more times; (3) Improving initial flow performance, even segregation, to...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F290/06C08F212/08C08F222/16C08F220/28C08F2/38C08G65/28
Inventor 谭洪波马保国代柱端汪杰李相国蹇守卫黄健
Owner 江苏诚意工程技术研究院有限公司
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