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Polycarboxylate-type water reducer as well as synthetic method and applications thereof

The technology of a polycarboxylic acid system and a synthesis method, which is applied in the field of concrete additives, can solve problems such as low cost, and achieve the effects of low cost, simple production process, safety and environmental protection in the production process

Inactive Publication Date: 2017-07-25
NANXIONG MATERIAL PRODION BASE OF CHINESE ACADEMY OF SCI GUANGZHOU CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the defects of the existing polycarboxylate water reducer, the primary purpose of the present invention is to provide a new type of polycarboxylate water reducer based on polyvinylpyrrolidone synthesis, by introducing polyvinylpyrrolidone into acrylic acid polymerization reaction In this method, polyvinylpyrrolidone is grafted onto polyacrylic acid molecules to prepare a new type of polycarboxylate water reducer with good water reducing effect and low cost.

Method used

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  • Polycarboxylate-type water reducer as well as synthetic method and applications thereof
  • Polycarboxylate-type water reducer as well as synthetic method and applications thereof
  • Polycarboxylate-type water reducer as well as synthetic method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 4

[0037] The polyvinylpyrrolidone used in Examples 4-5 is purchased on the market, the molecular weight of Example 4 is 10,000, and the molecular weight of Example 5 is 38,000.

Embodiment 1

[0039] A polycarboxylate water reducer, prepared by the following method:

[0040] Dissolve 11g of polyvinylpyrrolidone, 0.62g of sodium hypophosphite and 6.52g of acrylic acid in 30g of deionized water to prepare drip solution A, and dissolve initiator 0.57g of ammonium persulfate in 36g of deionized water to prepare dropwise solution B ; In the closed four-necked flask equipped with a stirring device, the nitrogen was exhausted for 10 minutes, and then the dripping solution A and B were started to be added dropwise under the condition of constant oil bath temperature and stirring, wherein the dripping solution A and B were added dropwise. The time is 3.0 hours and 3.8 hours respectively; after the dropwise addition is complete, the heat preservation reaction is carried out for 1 hour. After cooling, the product is finally neutralized with lye until the pH value of the product is 5.0 to 7.8 to obtain the polycarboxylic acid water-reduced agent.

Embodiment 2

[0042] A polycarboxylate water reducer, prepared by the following method:

[0043] Dissolve 11g of polyvinylpyrrolidone, 0.58g of sodium hypophosphite and 7.61g of acrylic acid in 30g of deionized water to prepare drip solution A, and dissolve initiator 0.34g of ammonium persulfate in 36g of deionized water to prepare dropwise solution B ; In the closed four-necked flask equipped with a stirring device, the nitrogen was exhausted for 10 minutes, and then the dripping solution A and B were started to be added dropwise under the condition of constant oil bath temperature and stirring, wherein the dripping solution A and B were added dropwise. The time is 2.5 hours and 3.2 hours respectively; after the dropwise addition is complete, the insulation reaction is continued for 2 hours. After cooling, the product is finally neutralized with lye until the pH value of the product is 5.0 to 7.8 to obtain the polycarboxylic acid water-reducing agent.

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Abstract

The invention discloses a novel polycarboxylate-type water reducer synthesized based on polyvinyl pyrrolidone as well as a synthetic method and applications thereof. The structure of the polycarboxylate-type water reducer is shown in a formula I, and the synthetic method comprises the following steps: polyvinyl pyrrolidone, sodium hypophosphite, and acrylic acid are dissolved in deionized water, and dropwise adding liquid A is prepared; an initiator ammonium persulfate is dissolved in deionized water, and dropwise adding liquid B is prepared; the dropwise adding liquid A and the dropwise adding liquid B are added into a reaction apparatus dropwise, a reaction with insulation is carried out for 1-2 hours, finally alkali liquor is used for product neutralization till the pH value of the product is 5.0-7.8, and the polycarboxylate-type water reducer is obtained. The novel polycarboxylate-type water reducer has good water reducing effects and low cost; in the processes of preparation of polyvinyl pyrrolidone and synthesis of the water reducer, only water is used as the solvent, so that the production process of the novel polycarboxylate-type water reducer does not cause any harm to production personnel and environment.

Description

technical field [0001] The invention belongs to the field of concrete additives, in particular to a water reducer, in particular to a novel polycarboxylate water reducer synthesized based on polyvinylpyrrolidone and its synthesis method and application. Background technique [0002] Water reducer, also known as plasticizer, is one of the admixtures to improve the rheological properties of concrete, and has gradually become the fifth component in modern concrete besides cement, sand, stone and water. There are many types of water reducing agents, each with its own advantages and disadvantages. [0003] Lignosulfonate superplasticizer has a wide range of raw materials, but its water reducing ability is poor. [0004] Although the naphthalene-based superplasticizer has a high water-reducing rate, it is prone to pollution in the production process and has the disadvantage of rapid slump loss during use. For example, in the Chinese patent CN103387349A, the preparation method of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F271/02C08F220/06C04B24/26C04B103/30
CPCC08F271/02C04B24/2652C04B2103/302C08F220/06
Inventor 廖兵黄福仁庞浩黄健恒年福伟雍奇文马哲
Owner NANXIONG MATERIAL PRODION BASE OF CHINESE ACADEMY OF SCI GUANGZHOU CHEM