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Gradient release type long-acting slump-retaining polycarboxylic water reducer, and preparation method and application thereof

A technology of slump-preserving polycarboxylic acid and water-reducing agent, applied in the field of building materials, can solve the problems of easy fluctuation of concrete working performance, loss of concrete fluidity, and segregation of concrete bleeding, so as to meet the requirement of fluidity retention time and solve the Slump loss, effect of reducing temperature sensitivity

Pending Publication Date: 2020-06-26
湖北西建新材料科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current slump-preserving water-reducing agent has obvious defects in the dispersing time period of concrete. A low slump-preserving component will lead to loss of concrete fluidity and difficulty in construction; a high slump-preserving component will cause concrete bleeding and segregation. Pump blocking phenomenon
The temperature sensitivity is large, the performance of concrete is prone to fluctuations, accidents such as unloading and pump blockage are prone to occur during transportation and construction, and may have a serious negative impact on the quality of concrete structures

Method used

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  • Gradient release type long-acting slump-retaining polycarboxylic water reducer, and preparation method and application thereof
  • Gradient release type long-acting slump-retaining polycarboxylic water reducer, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation process of the long-acting slump-retaining polycarboxylate superplasticizer of the gradient release type in this embodiment is as follows:

[0031] 1) In a glass reactor equipped with a thermometer and a stirrer, add 20g of acrylic acid and 1g of cellulose ether, stir and mix well, then slowly add 10g of concentrated sulfuric acid, raise the temperature to 30°C, continue stirring for 180min, then add 30g of Ionized water, that is, to obtain a mixed solution of crosslinking monomer D containing unsaturated cellulose carboxylate;

[0032] 2) In a glass reactor equipped with a thermometer and a stirrer, sequentially add 200g of prenol polyoxyethylene ether and 270g of deionized water, stir and dissolve, then slowly add 5g of the mixed solution prepared in step 1), and stir for 30min , and then add 1g of ammonium persulfate to obtain the reactant solution;

[0033] 3) In the state of stirring, heat up or cold water to cool down to 10° C., respectively dropwis...

Embodiment 2

[0035] The preparation process of the long-acting slump-retaining polycarboxylate superplasticizer of the gradient release type in this embodiment is as follows:

[0036] 1) In a glass reactor equipped with a thermometer and a stirrer, add 10g of acrylic acid, 10g of methacrylic acid and 2g of cellulose ether, stir and mix well, then slowly add 15g of concentrated sulfuric acid, raise the temperature to 45°C, and continue stirring for 180min Finally, add 35g deionized water to obtain the crosslinking monomer D mixed solution containing unsaturated cellulose carboxylate;

[0037] 2) In a glass reactor equipped with a thermometer and a stirrer, sequentially add 200g of isobutenol polyoxyethylene ether and 270g of deionized water, after stirring and dissolving, slowly add 7g of the mixed solution prepared in step 1), stir for 30min, and then Add 1.5g of sodium persulfate to obtain the reactant solution;

[0038] 3) In the state of stirring, heat up or cool down to 20°C with cold...

Embodiment 3

[0040] The preparation process of the long-acting slump-retaining polycarboxylate superplasticizer of the gradient release type in this embodiment is as follows:

[0041] 1) In a glass reactor equipped with a thermometer and a stirrer, add 10g of methacrylic acid, 10g of maleic anhydride and 3g of cellulose ether, stir and mix well, then slowly add 5g of concentrated sulfuric acid, raise the temperature to 60°C, and continue After stirring for 120 min, add 40 g of deionized water to obtain a mixed solution of crosslinking monomer D containing unsaturated cellulose carboxylate;

[0042] 2) In a glass reactor equipped with a thermometer and a stirrer, sequentially add 200g of methallyl alcohol polyoxyethylene ether and 270g of deionized water, after stirring and dissolving, slowly add 10g of the mixed solution prepared in step 1), and stir 30min, then add 2g of potassium persulfate to obtain the reactant solution;

[0043] 3) In the state of stirring, heat up or cool down to 30...

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Abstract

The invention provides a gradient release type long-acting slump-retaining polycarboxylic water reducer, and belongs to the technical field of building materials. The water reducer is prepared by freeradical polymerization of raw materials including an unsaturated polyether macromonomer A, an unsaturated carboxylic acid monomer B, a hydrolyzed ester monomer C and a crosslinking monomer D containing unsaturated carboxylic acid cellulose ester. The invention also provides a preparation method and an application of the water reducer. According to the water reducer disclosed by the invention, theester group hydrolysis release capacity on a molecular chain of the polycarboxylic reducer in an alkaline environment is effectively adjusted, carboxylate ions can be stably released in a graded manner along with time, the introduced cellulose micromolecules can enable the polymer to be slightly cross-linked and reduce the temperature sensitivity of hydrolysis and release, 0-4 h of staged whole-process stable supplement of admixture consumption in concrete is realized, different fluidity retention time requirements are met, the workability of the concrete is improved, and the problems of slump loss, segregation and bleeding of the concrete are obviously solved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a gradient-release long-acting slump-retaining polycarboxylate water reducer and its preparation and application. Background technique [0002] With the continuous deepening of the application of polycarboxylate superplasticizer in concrete, and the popularization of pumping construction technology, the deterioration of urban traffic environment and the fluctuation of the quality of sand and gravel raw materials, the requirements for the fluidity of ready-mixed concrete over time have increased significantly. . Under the new situation, the slump of concrete is required to be continuously stable for 0-4 hours, and the process does not enlarge bleeding or loss; when the temperature difference between day and night is large, the concrete slump does not lose during the day, does not enlarge at night, and the pumping is stable; the quality of raw materials fluctuates When ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F290/10C08F220/06C08F220/20C08F220/14C08F220/18C08F222/06C04B24/26C04B103/30
CPCC08F283/065C08F290/10C04B24/2694C04B2103/302
Inventor 汪金文王军陈景刘其彬周辉吕振华罗杰周继前
Owner 湖北西建新材料科技有限公司
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