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Set-retarding polycarboxylic acid water reducer and preparation method thereof

A technology of retarding polycarboxylic acid and water reducing agent, applied in the field of water reducing agent, can solve the problems that water reducing and retarding can not be taken into account, and affect the performance of water reducing agent, so as to achieve good anticorrosion effect, short reaction time and safety factor high effect

Active Publication Date: 2019-05-03
厦门路桥翔通建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects that the existing polycarboxylate water reducer cannot take into account the two aspects of water reduction and retardation, and the compounding with the existing retarder will affect the performance of the water reducer. Polycarboxylate water reducer and preparation method thereof taking into account both water reduction and setting retardation

Method used

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  • Set-retarding polycarboxylic acid water reducer and preparation method thereof
  • Set-retarding polycarboxylic acid water reducer and preparation method thereof
  • Set-retarding polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Raw materials: see Table 1.

[0029] The preparation process is as follows:

[0030] (1) Sodium styrene sulfonate and unsaturated acid are formulated into a concentration of 50wt% aqueous solution, which is recorded as the first solution, and the reducing agent and chain transfer agent are formulated into a concentration of 5.5wt% aqueous solution, which is recorded as the second solution Two solutions;

[0031] (2) Prepare the unsaturated polyether into an aqueous solution with a concentration of 40wt%, add an oxidizing agent, then add the first solution and the second solution dropwise at the same time and control the total time of dropping within 2 to 3 hours. Phosphoric acid, continue to react for 1h. After the reaction, add a certain amount of water to obtain a retarded polycarboxylate superplasticizer solution with a concentration of 40 wt%.

Embodiment 2

[0033] Raw materials: see Table 1.

[0034] The preparation method is the same as in Example 1.

Embodiment 3

[0036] Raw materials: see Table 1.

[0037] The preparation method is the same as in Example 1.

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Abstract

The invention belongs to the field of water reducers, and concretely relates to a set-retarding polycarboxylic acid water reducer and a preparation method thereof. The set-retarding polycarboxylic acid water reducer is prepared from 20-45 wt% of unsaturated polyether, 2-6 wt% of unsaturated acid, 0.9-10 wt% of sodium p-styrenesulfonate, 0.5-2 wt% of organic phosphoric acid, 0.2-1 wt% of an oxidant, 0.05-0.2 wt% of a reducing agent, 0.1-0.5 wt% of a chain transfer agent, and the balance of water. The set-retarding polycarboxylic acid water reducer has a high water reducing rate and a good set retarding effect, has a good adaptability to different types of cement, and does not cause side effects due to different types of cement. In addition, the set-retarding polycarboxylic acid water reducer has a good anticorrosion effect, and does not have spoilage, layering or odor phenomenon after standing for a too long time in summer.

Description

technical field [0001] The invention belongs to the field of water reducers, and specifically discloses a retarding polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Retarding water reducer is an admixture widely used in concrete admixtures. It is an admixture that retards setting and greatly reduces mixing water consumption. With the development of basic construction, more and higher requirements are put forward for the performance of concrete, and higher requirements are also put forward for concrete admixtures. [0003] High-performance polycarboxylate superplasticizer has the advantages of high water-reducing rate, good dispersibility to cement, and small loss of concrete slump. However, the retarding effect of polycarboxylate superplasticizer itself is relatively weak, and it must be compounded with retarder to achieve the above effect. Although compounding technology can solve some problems, the extent to which problems can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F4/40C04B24/32C04B28/02C04B103/30
Inventor 李芳杨秀芳
Owner 厦门路桥翔通建材科技有限公司