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A kind of comb polymer, its preparation method and the application as water reducing agent

A comb-shaped polymer and copolymer technology, which is applied in the field of polycarboxylate water reducing agent, can solve the problems such as difficulty in improving water reducing performance, and achieve the effects of improving water reducing performance, high monomer conversion rate and thorough polymerization.

Active Publication Date: 2018-07-13
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defect that the water-reducing performance of the existing polycarboxylate water-reducer field is difficult to improve, one of the purposes of the present invention is to provide a comb-shaped polymer that can be used as a polycarboxylate water-reducer

Method used

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  • A kind of comb polymer, its preparation method and the application as water reducing agent
  • A kind of comb polymer, its preparation method and the application as water reducing agent
  • A kind of comb polymer, its preparation method and the application as water reducing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0039]Add 100 parts of deionized water, 85 parts of HPEGI, 85 parts of TPEGI, and 3 parts of AMPS into a 1L four-necked round-bottomed flask equipped with a thermometer, a stirrer, and a dropping tube. After dissolving, add 1.50 parts of hydrogen peroxide solution with a concentration of 30%, stir for 3 minutes, and then simultaneously dropwise add monomer aqueous solution composed of 16 parts of acrylic acid and 5 parts of deionized water and 1.65 parts of thioglycolic acid and 0.47 parts of L -Aqueous solution of initiator prepared by ascorbic acid and 113 parts of deionized water, the monomer solution was added dropwise for 3 hours, and the initiator solution was added dropwise for 3.2 hours. The sodium aqueous solution is neutralized to pH 6, and the material is discharged, which is the mother liquor of polycarboxylate superplasticizer, which is recorded as PCEs (50HPEGI & 50TPEGI), and the weight average molecular weight is about 35300.

Embodiment 2

[0041] Add 100 parts of deionized water, 85 parts of HPEG II, 85 parts of TPEG I, and 2.5 parts of AMPS into a 1L four-necked round-bottomed flask equipped with a thermometer, a stirrer, and a dropping tube. Stir and mix and heat up to 60°C until completely After dissolving, add 1.50 parts of hydrogen peroxide solution with a concentration of 30%, stir for 3 minutes, and then simultaneously dropwise add monomer aqueous solution composed of 16 parts of acrylic acid and 5 parts of deionized water and 1.65 parts of thioglycolic acid and 0.47 parts of L -Aqueous solution of initiator prepared by ascorbic acid and 113 parts of deionized water. The monomer solution was added dropwise for 3 hours, and the initiator solution was added dropwise for 3.2 hours. The sodium aqueous solution is neutralized to pH 6, and the discharge is the mother liquor of polycarboxylate superplasticizer, which is recorded as PCEs (50HPEGⅡ&50TPEGⅠ), and the weight average molecular weight is about 38800.

Embodiment 3

[0043] Add 100 parts of deionized water, 119 parts of VPEG II, 51 parts of TPEG II, and 3 parts of AMPS into a 1L four-necked round-bottomed flask equipped with a thermometer, a stirrer, and a dropping tube. Stir and mix and raise the temperature to 60°C. After dissolving, add 1.50 parts of hydrogen peroxide solution with a concentration of 30%, stir for 3 minutes, and then simultaneously dropwise add monomer aqueous solution composed of 16 parts of acrylic acid and 5 parts of deionized water and 1.65 parts of thioglycolic acid and 0.47 parts of L -Aqueous solution of initiator prepared by ascorbic acid and 113 parts of deionized water. The monomer solution was added dropwise for 3 hours, and the initiator solution was added dropwise for 3.2 hours. The sodium aqueous solution is neutralized to a pH of 6, and the discharge is the mother liquor of the polycarboxylate superplasticizer, which is recorded as PCEs (70VPEGⅡ&30TPEGⅡ), and the weight average molecular weight is about 33...

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Abstract

The invention provides a comb-type polymer. The comb-type polymer is a copolymer with weight-average molecular weight of 20000-50000 prepared from monomers A, B and C, wherein the monomers A comprise two or more nonsaturated alkenyl-terminated polyether large monomers, the monomer B is 2-acrylamide-2-methylpropanesulfonic acid and the monomer C is unsaturated carboxylic acid or its derivative small monomer. The invention also provides a preparation method of the comb-type polymer and a use of the comb-type polymer as a polycarboxylic acid water reducer. Through combination of three types of the monomers, comb-type polymer polymerization is thorough, a monomer conversion rate is high and water reducer performances of the polycarboxylic acid water reducer are substantially improved.

Description

technical field [0001] The invention relates to the field of polycarboxylate water reducers, in particular to a comb polymer, its preparation method and its use as a water reducer. Background technique [0002] The water-soluble comb polymer used as polycarboxylate superplasticizer in concrete has excellent cement slurry dispersion performance. The latest generation of polycarboxylate superplasticizer is composed of unsaturated terminal alkenyl polyoxyethylene ether and unsaturated small molecule organic acid (anhydride), such as (meth)acrylic acid, itaconic acid, maleic anhydride and other monomers Prepared by copolymerization, the type and structure of the polymerized monomers and the reactivity ratio between the polymerized monomers all directly affect the performance of the polycarboxylate water reducer. [0003] The terminal alkenyl polyoxyethylene ether accounts for more than 85% of the molecular mass fraction of the entire polycarboxylate water reducer, and its struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F291/08C08F220/06C08F220/58C08F222/02C08F222/06C04B24/26C04B103/30
Inventor 朱建民刘兆滨董振鹏周立明于连林
Owner LIAONING OXIRANCHEM INC
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