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High-water-retention polycarboxylate superplasticizer and preparation method thereof

A water-retaining polycarboxylic acid technology, applied in the field of concrete admixtures, can solve problems such as high cost, complicated preparation process, and poor water-retaining effect

Pending Publication Date: 2020-10-27
GUIZHOU DR SHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing technology, the technical problem solved by the present invention is to provide a high water-retaining polycarboxylate water-reducing agent and its preparation method to solve the problems of poor water-retaining effect, complicated preparation process and high cost of existing concrete water-retaining agents

Method used

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  • High-water-retention polycarboxylate superplasticizer and preparation method thereof
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  • High-water-retention polycarboxylate superplasticizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0047] Embodiment 1 is basically as attached figure 1 - attached Figure 6 Shown:

[0048] (1) 100 parts of maleic anhydride, 750 parts of polyethylene glycol monomethyl ether (Mn=750) and 1 g of p-toluenesulfonic acid were added to a four-necked flask, and reacted for 2 hours at 100° C. At room temperature, polyethylene glycol monomethyl ether maleic anhydride ester is obtained.

[0049] (2) Add 300g of EPEG polyether (Mn=3000) and 240g of deionized water into a four-necked flask, start stirring, and after the polyether monomer is completely dissolved, add the polyethylene glycol monomethyl ether produced in step (1) Ether maleic anhydride 21g and 4g sodium hypophosphite, after stirring for 10 minutes, add 2g hydrogen peroxide; prepare A and B solutions, of which A solution: 25g acrylic acid + 1.2g allyl methacrylate + 30g deionized water; B solution: 0.45 gE51+50g deionized water; when the temperature of the bottom solution is controlled at 15±2°C, the prepared A and B so...

Embodiment 2

[0063] The difference between embodiment 2 and embodiment 1 is:

[0064] (1) 100 parts of maleic anhydride, 750 parts of polyethylene glycol monomethyl ether (Mn=750) and 1 g of p-toluenesulfonic acid were added to a four-necked flask, and reacted for 2 hours at 100° C. At room temperature, polyethylene glycol monomethyl ether maleic anhydride ester is obtained.

[0065] (2) Add 300g of EPEG polyether (Mn=3000) and 240g of deionized water into a four-necked flask, start stirring, and after the polyether monomer is completely dissolved, add the polyethylene glycol monomethyl ether produced in step (1) Add 21g of ether maleic anhydride ester, stir for 10min and add 2.6g of hydrogen peroxide; prepare A and B solutions, wherein A solution: 25g acrylic acid + 1.2g allyl methacrylate + 30g deionized water; B solution: 0.9g VC + 2.3g Mercaptopropionic acid + deionized water; when the temperature of the solution at the bottom of the kettle is controlled at 20±2°C, the prepared A and ...

Embodiment 3

[0068] The difference between embodiment 3 and embodiment 1 is:

[0069] (1) 98 parts of maleic anhydride, 600 parts of polyethylene glycol monomethyl ether (Mn=600) and 1.47 g of p-toluenesulfonic acid were added to a four-necked flask, and reacted for 2 hours at 100° C. To room temperature, polyethylene glycol monomethyl ether maleic anhydride ester is obtained.

[0070] (2) Add 300g of EPEG polyether (Mn=3000) and 220g of deionized water into a four-neck flask, start stirring, and after the polyether monomer is completely dissolved, add the polyethylene glycol monomethyl ether produced in step (1) 19g of ether maleic anhydride ester and 0.8g of mercaptopropionic acid, after stirring for 10min, add 2.4g of hydrogen peroxide; prepare A and B solutions, wherein A solution: 25g acrylic acid + 1.2g allyl methacrylate + 30g deionized water; B solution : 0.8gVC + 0.8g mercaptopropionic acid + deionized water; when the temperature of the solution at the bottom of the kettle is con...

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Abstract

The invention relates to the technical field of concrete admixtures, and particularly discloses a high-water-retention type polycarboxylate superplasticizer and a preparation method thereof. The high-water-retention type polycarboxylate superplasticizer is prepared from a monomer A, a monomer B, a monomer C, a monomer D, an initiator, a catalyst, a chain transfer agent and water through free radical copolymerization reaction and neutralization with an alkaline solution. The preparation method of the high-water-retention polycarboxylate superplasticizer is simple, and the water retention capacity of concrete can be improved while the water reduction and slump loss resistance of the concrete are ensured.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a high water retention polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, strong plasticity, small slump loss, green and environmental friendly, and has been widely used in municipalities, railways, highways, ports, bridges, Hydropower and other engineering fields. However, due to the large variety of cement in China, the quality of coal ash and other silty materials is uneven, and the quality of concrete sand and gravel is getting worse and worse. There are also some problems in the practical application of polycarboxylate superplasticizers: such as high sensitivity to materials, poor adaptability , Insufficient water retention performance and other shortcomings, especially during low temperature construction in winter, the phenomen...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F290/06C08F220/06C08F220/40C04B24/26C04B103/30
CPCC08F283/065C08F290/062C04B24/2694C04B2103/302C08F220/06C08F220/40
Inventor 邓妮陈杰方世昌田应兵
Owner GUIZHOU DR SHI TECH
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