Method for preparing high-performance polycarboxylate superplasticizer via heat resource-free process

A polycarboxylic acid, high-performance technology, applied in the field of building materials, can solve problems such as environmental pollution, and achieve the effects of environmental friendliness, reduced production costs, and stable performance

Active Publication Date: 2014-05-21
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, most of the current production processes of polycarboxylate superplasticizers use heating methods, such as steam heating, heat transfer oil heating, etc., which will cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Add 100 parts of allyl polyoxyethylene ether and 150 parts of water into the reaction kettle, stir to dissolve;

[0034] 2) At 5~30°C, add 2 parts of ammonium persulfate (sodium persulfate or potassium persulfate can also be used instead), and stir for half an hour;

[0035] 3) Add 2 parts of sodium hypophosphite and 1 part of 2-mercaptoacetic acid (the 2-mercaptoacetic acid can also be replaced by 3-mercaptopropionic acid) mixed solution and 10 parts of acrylic acid (the acrylic acid can also be methacrylic acid or itaconic acid) and 5 parts of methyl acrylate (the methyl acrylate can also be replaced by ethyl acrylate or butyl acrylate) mixed solution, dripping for 3 hours, aging for 1.5 hours, and finally, adding 20 parts of sodium hydroxide solution ( Potassium hydroxide, calcium hydroxide, ammonia water, sodium silicate or ethanolamine can also be used to neutralize to obtain a high-performance polycarboxylic acid mother liquor.

Embodiment 2

[0037] 1) Add 150 parts of methallyl polyoxyethylene ether and 225 parts of water into the reaction kettle, stir to dissolve;

[0038] 2) At 5~30°C, add 3 parts of hydrogen peroxide at one time and stir for half an hour;

[0039] 3) Add dropwise 1 part of sodium bisulfite (the sodium bisulfite can also be replaced by hanging white cubes), 1 part of mercaptosuccinic acid mixed solution, 30 parts of maleic acid and 5 parts of hydroxyethyl acrylate ( The hydroxyethyl acrylate can also be replaced by hydroxypropyl acrylate) mixed solution, dripping over 2 hours, aging for 1.5 hours, and finally, adding 30 parts of sodium hydroxide solution to neutralize, and then a high-performance polycarboxylic acid mother liquor can be obtained.

Embodiment 3

[0041] 1) Add 200 parts of isopentenyl polyoxyethylene ether and 300 parts of water into the reaction kettle, stir to dissolve;

[0042] 2) At 5~30°C, add 0.5 parts of azobisisobutylimidazoline hydrochloride (azobisisobutylamidine hydrochloride or azobiscyanovaleric acid can also be substituted) at one time, and stir half an hour;

[0043] 3) Add dropwise 1 part of sodium thiosulfate (the sodium thiosulfate can also be replaced by L-ascorbic acid or ferrous sulfate), 1 part of mercaptosuccinic acid mixed solution, 30 parts of crotonic acid and 5 parts of acrylic acid hydroxyl Ethyl ester mixed solution, dripping for 2 hours, aging for 1.5 hours, and finally, adding 35 parts of sodium hydroxide solution to neutralize, and then the high-performance polycarboxylic acid mother liquor can be obtained.

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Abstract

The invention discloses a method for preparing high-performance polycarboxylate superplasticizer via a heat resource-free process, and the method comprises the following steps of 1) adding unsaturated polyoxyethylene ether and water in certain proportion into a reaction still and stirring for dissolution, 2) adding oxidizing agent water solution at 5-30 DEG C at one time and stirring, and 3) respectively dropping mixed solution of accelerant and chain transfer agent in proper proportion and comonomer in 2-4h, after the dropping, curing for 1.5h, and finally adding alkaline modifier for neutralization so as to obtain the polycarboxylate superplasticizer. The method is simple in process and the prepared polycarboxylate superplasticizer has high dispersing performance in low amount of admixture. By using the heat resource-free process, the step of heating is decreased, so that the production is more simple and convenient, the cost is lower, the environmental-friendly property is provided and the energy consumption is decreased.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a high-performance polycarboxylate water reducer with no heat source technology. Background technique [0002] With the development of concrete in the direction of high performance and multifunctionality, concrete is required to have high workability, high strength, high durability, and can meet the application in many special situations. Superplasticizers with hyperdispersive properties have become one of the indispensable components in high performance concrete. [0003] In recent years, with the country's increasing emphasis on energy saving and emission reduction and the rapid promotion of the concept of low-carbon economy, scientific and technological workers are striving to improve the performance of concrete water reducing agents and also pay attention to how to reduce their energy consumption. In particular, enterprises are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F4/40C04B24/26C04B103/30
Inventor 柯余良方云辉林艳梅郭鑫祺沈建荣
Owner KZJ NEW MATERIALS GROUP CO LTD
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