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Polyether polycarboxylic acid water reducing agent and preparation method therefor

A technology of water reducing agent and polycarboxylic acid, applied in the field of polyether polycarboxylate water reducing agent, can solve the problems of reducing water reducing ability, difficulty in production and operation, etc., achieving low material cost, improving comb molecular structure, and improving operation simple effect

Inactive Publication Date: 2015-11-18
CHINA BUILDING MATERIALS ACAD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts esterification reaction to make macromonomer, and the cost is relatively low, but because polyethylene glycol is easy to generate diester during the esterification process, the synthesis system is gelled and the water reducing capacity is reduced, which brings difficulties to the production operation

Method used

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  • Polyether polycarboxylic acid water reducing agent and preparation method therefor
  • Polyether polycarboxylic acid water reducing agent and preparation method therefor
  • Polyether polycarboxylic acid water reducing agent and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 84g of methallyl polyoxyethylene ether macromonomer (molecular weight 2400) into a four-necked glass flask as a reaction kettle equipped with a stirrer, a thermometer, and a peristaltic pump dropping device, and then add 36g of allyl polyoxyethylene ether macromer Add 75g of water to oxyethylene ether (molecular weight: 2400), stir and dissolve at 30°C under normal pressure to form a fully dissolved solution.

[0045] Add 15.5g of acrylic acid into the beaker of material A, and dissolve it with 10.3g of water to make material A for use.

[0046] Add 0.4g of potassium sodium tartrate, 0.6g of mercaptoacetic acid, and 0.6g of mercaptopropionic acid into the beaker of material B, and dissolve it with 26.6g of water to prepare material B for use.

[0047] Add 1.67g of 30% hydrogen peroxide into the reactor, and at the same time use the peristaltic pump dripping device to start adding materials A and B into the reactor, and drop them at a constant speed within 4 hours.

...

Embodiment 2

[0052] Add 101g of methallyl polyoxyethylene ether macromonomer (molecular weight 2400) into a four-necked glass flask as a reaction kettle equipped with a stirrer, a thermometer, and a peristaltic pump dropping device, and then add 22g of allylpolyoxyethylene ether macromonomer (molecular weight: 2400). Add 77g of water to oxyethylene ether (molecular weight: 1200), stir and dissolve at 30°C under normal pressure to form a fully dissolved solution.

[0053] Add 18.6g of acrylic acid into the beaker of material A, and dissolve it with 10.3g of water to make material A for use.

[0054] Add 0.5gV to the material B beaker C , 1.4g of sodium methacrylate was dissolved in 26.6g of water to make material B and set aside.

[0055] Add 1.93g of 30% hydrogen peroxide to the reactor, and at the same time use the peristaltic pump dripping device to start adding materials A and B to the reactor, and drop them at a constant speed within 4 hours.

[0056] The reaction kettle was heated u...

Embodiment 3

[0060] Add 111g of methallyl alcohol polyoxyethylene ether macromonomer (molecular weight 2400) into a four-necked glass flask as a reaction kettle equipped with a stirrer, a thermometer, and a peristaltic pump dropping device, and then add 12g of allyl alcohol polyoxyethylene ether macromonomer (molecular weight: 2400). Add 77g of water to oxyethylene ether (molecular weight: 600), stir and dissolve at 30°C under normal pressure to form a fully dissolved solution.

[0061] Add 20.4g of methacrylic acid into the beaker of material A, and dissolve it with 13.6g of water to make material A for use.

[0062] Add 0.6gV to the material B beaker C , 0.8g mercaptoacetic acid, 0.8g mercaptopropionic acid, dissolved in 35.1g water to make material B, set aside.

[0063] Add 2.19g of potassium persulfate to the reactor, and at the same time use the peristaltic pump dripping device to start dripping materials A and B into the reactor, and drop them at a constant speed within 4 hours.

...

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Abstract

The present invention discloses a polyether polycarboxylic acid water reducing agent and a preparation method therefor. Macromonomers with relatively weak activity are used to replace part of macromonomers with better activities but with higher prices; unsaturated acid with lower cost is used to replace part of unsaturated acid with a higher price; a suitable redox initiation system is chosen; and by adjusting a proportion of an initiator, a molecular weight regulator, and a comonomer, polymerization is performed at the temperature of 25-30 DEG C, and a high performance polycarboxylic acid water reducing agent that is suitable for preparing low-grade concrete is prepared; and the method is low in material cost, simple in operation, and green and environmentally friendly; the water reducing performance of the water reducing agent can be equivalent to the performances of naphthalene-series and aliphatic water reducing agents, and the water reducing agent has an advantage of high cost performance.

Description

technical field [0001] The invention relates to a polyether polycarboxylate water reducer and a preparation method of the polyether polycarboxylate water reducer. Background technique [0002] With the rapid development of the construction industry, polycarboxylate high-performance water reducers have been widely used in high-speed railways, municipal transportation, etc. High-strength, high-performance concrete projects such as hydropower dams, bridges, tunnels and high-rise buildings. [0003] Although polycarboxylate superplasticizers have higher cost-effective advantages compared with naphthalene-based and aliphatic superplasticizers when preparing medium-to-high-strength grade (≥C40) concrete. However, when preparing low-strength concrete, the high water-reducing rate of polycarboxylate-based water-reducing agents makes them less resistant to water due to the small amount of glue used in concrete, high water-binder ratio, and relatively poor aggregate quality. volume ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F222/04C08F220/56C08F222/06C08F2/38C08F4/40C04B24/26C04B103/30
Inventor 李婷李晓宁宋作宝王玲郝利国李慧群朱玉雪王悦赵海洋吴明慧
Owner CHINA BUILDING MATERIALS ACAD
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