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A kind of preparation method of concrete polycarboxylate slump retaining agent

A technology of polycarboxylic acid and slump-retaining agent, applied in the field of building admixtures, can solve the problems of poor workability and bleeding of concrete, and achieve the effects of good workability, slowing down hydration speed, and guaranteeing dispersion and dispersion retention performance.

Active Publication Date: 2022-05-27
詹烨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phosphoric acid water reducing agent can maintain good initial water reducing capacity and long-term slump retention performance, however, in the process of concrete loss over time, it is easy to cause bleeding phenomenon, resulting in poor workability of concrete

Method used

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  • A kind of preparation method of concrete polycarboxylate slump retaining agent
  • A kind of preparation method of concrete polycarboxylate slump retaining agent
  • A kind of preparation method of concrete polycarboxylate slump retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] According to formula: 100 parts by weight of unsaturated polyether (structure shown in formula (1), wherein R is -CH 2 CH 2 -, n=25.2), 7 parts by weight of acrylic acid, 12 parts by weight of hydroxyethyl acrylate and 3 parts by weight of bistrimethylsilylated vinyl phosphate.

[0037] Add unsaturated polyether and 100 parts by weight of water into the reactor, stir and dissolve, keep the temperature at 15±2°C, add 12 parts by weight of 10% potassium persulfate aqueous solution, stir evenly, add acrylic acid, hydroxyethyl acrylate , a mixed solution composed of bistrimethyl silylated vinyl phosphate and 0.8 parts by weight of 2-mercaptoethanol, stir evenly, dropwise add 4 parts by weight of aqueous sodium bisulfite solution with a concentration of 15 wt% within 1 hour, add dropwise After the reaction was performed at a constant temperature of 30±2° C. for 1 hour, a copolymerization product 1 was obtained.

[0038] In 100 parts by weight of copolymerization product 1,...

Embodiment 2

[0040]According to formula: 100 parts by weight of unsaturated polyether (structure shown in formula (1), wherein R is -CH 2 CH 2 CH 2 -, n=47.1), 5 parts by weight of methacrylic acid, 15 parts by weight of hydroxyethyl methacrylate and 1 part by weight of bistrimethylsilylated vinyl phosphate.

[0041] Add unsaturated polyether and 200 parts by weight of water into the reaction kettle, stir and dissolve, keep the temperature at 10±2°C, add 10 parts by weight of 10% potassium persulfate aqueous solution, stir evenly, add methacrylic acid, methyl A mixed solution consisting of hydroxyethyl acrylate, bis-trimethylsilyl vinyl phosphate and 1 part by weight of 2-mercaptoacetic acid was stirred evenly, and 6 parts by weight of sodium bisulfite with a concentration of 10wt% was added dropwise within 1.5 hours The aqueous solution was added dropwise, and the reaction was carried out at a constant temperature of 25±2° C. for 1.5 hours to obtain a copolymerization product 2.

[004...

Embodiment 3

[0044] According to formula: 100 parts by weight of unsaturated polyether (structure shown in formula (1), wherein R is -CH 2 CH 2 CH 2 CH 2 -, n=55.3), 10 parts by weight of maleic acid, 10 parts by weight of hydroxypropyl acrylate and 5 parts by weight of bistrimethylsilylated vinyl phosphate.

[0045] Add unsaturated polyether and 300 parts by weight of water into the reactor, stir and dissolve, keep the temperature at 18±2°C, add 12 parts by weight of 10% potassium persulfate aqueous solution, stir evenly, add maleic acid, acrylic acid hydroxyl A mixed solution consisting of propyl ester, bis-trimethyl silylated vinyl phosphate and 1.2 parts by weight of 2-mercaptoacetic acid was stirred evenly, and 6 parts by weight of an aqueous solution of L-ascorbic acid with a concentration of 10 wt % was added dropwise within 2 hours. After the addition was completed, the reaction was performed at a constant temperature of 27±2° C. for 2 hours to obtain a copolymerization product ...

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PUM

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Abstract

The invention belongs to the technical field of building admixtures, and relates to a preparation method of concrete polycarboxylic acid slump-retaining agent, comprising the following steps: unsaturated polyether, unsaturated acid, hydroxyl-containing unsaturated ester monomer and unsaturated silicon-based phosphoric acid The ester is polymerized by free radicals to obtain a copolymerization product, and maleic anhydride is added to the copolymerization product for esterification to obtain the polycarboxylate slump retaining agent; the present invention introduces silicon-based phosphate into the molecular structure of the polycarboxylate slump retainer, In addition, maleic anhydride is added to the copolymerization product for esterification to obtain a slump retaining agent with good slump retaining effect, good workability, and no bleeding after time loss, which has great application value.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, in particular to a preparation method of a concrete polycarboxylic acid slump-retaining agent. Background technique [0002] With the rapid increase in the amount of polycarboxylate superplasticizers and the continuous expansion of the scope of use, the increasing shortage of high-quality sand and gravel aggregates, the use of a large amount of mud-containing aggregates, and the large-scale use of low-quality admixtures lead to more complex cement components, resulting in Concrete fluidity loss is too large. The loss of concrete fluidity not only seriously affects the construction progress of the project, but also deteriorates the performance of concrete, and even seriously reduces the service life of concrete structures. Controlling the loss of concrete fluidity and better meeting the needs of actual construction is an urgent problem that high-performance concrete needs to solve. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/20C08F230/08C08F8/14C04B24/42
CPCC08F283/065C08F8/14C04B24/42C08F230/08C08F220/20
Inventor 詹烨
Owner 詹烨
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