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A low-temperature preparation method of a highly adaptable ether polycarboxylate water reducer

An ether polycarboxylic acid, adaptable technology, applied in the field of building materials, can solve the problems of poor adaptability, achieve the effects of reducing the occurrence of side reactions, simple process, improving dispersibility and dispersibility retention ability

Active Publication Date: 2017-09-15
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the application of concrete admixtures involves the problems of the admixture itself and cement and sand and gravel materials, although the excellent water-reducing performance of polycarboxylate superplasticizers has been widely recognized by the industry, the admixtures and cement and other cementitious materials Adaptability has still become an important problem in the current concrete construction process, and its main manifestations are poor adaptability and other problems. It is imminent to improve the adaptability of polycarboxylate water reducers, especially ether polycarboxylate water reducers; and , with the country's emphasis on energy-saving and environmental protection industries, reducing energy consumption has become the consensus of the whole society, so the development of low-temperature polymerization technology is very beneficial to the energy-saving and emission-reduction of concrete admixtures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In parts by mass, 5 parts of acrylic acid, 5 parts of allyl sodium sulfonate, 3 parts of isopropenylphosphonic acid and 30 parts of water are configured into a mixed solution A; 0.9 parts of 2-hydroxy-2-sulfinic acid, 0.1 part of 2-hydroxy-2-sulfoacetic acid disodium salt and 30 parts of water were prepared as mixed solution B. Add 100 parts of allyl polyoxyethylene ether, 2 parts of disodium hydrogen phosphate and 50 parts of water into the reaction kettle; adjust the reaction temperature to 40°C, add 1 part of hydrogen peroxide at a time, and stir to dissolve it. Add the mixed solution A and the mixed solution B dropwise at the same time respectively, and the dropping time is 2h; after the dropwise addition, continue to react for 1 hour; finally add 10 parts of sodium hydroxide solution with a mass concentration of 30% for neutralization, and obtain the described Polycarboxylate superplasticizer with a monomer conversion rate of 98.9%.

Embodiment 2

[0030] In parts by mass, 7 parts of acrylic acid, 2 parts of methyl acrylate, 2 parts of sodium vinylsulfonate, 0.5 parts of 2-acrylamide-2-methylpropylphosphonic acid, 0.6 parts of 2-mercaptoacetic acid and 30 parts of water Prepare mixed solution A; prepare mixed solution B with 0.4 parts of 2-hydroxy-2-sulfinic acid disodium salt and 30 parts of water. Add 100 parts of methallyl polyoxyethylene ether, 1 part of sodium bicarbonate and 50 parts of water into the reaction kettle; adjust the reaction temperature to 15°C, add 0.4 parts of sodium persulfate at one time, and stir to dissolve it. Add the mixed solution A and the mixed solution B dropwise at the same time, and the dropping time is 4 hours; after the dropping, you can add 0.5 part of the white block at one time, and continue the reaction for 2 hours; finally add 12 parts of 30% hydrogen hydroxide The sodium solution is neutralized to obtain the polycarboxylate water reducer with a monomer conversion rate of 99.5%.

Embodiment 3

[0032] In terms of parts by mass, 10 parts of acrylic acid, 2 parts of hydroxymethyl acrylate, 1 part of sodium methacrylate, 1 part of dimethyl allyl phosphonate, 2 parts of 2-mercaptoacetic acid and 30 parts of water are configured to mix Solution A: Mix 0.1 part of 2-hydroxy-2-sulfinic acid disodium salt, 0.1 part of 2-hydroxy-2-sulfinic acid disodium salt and 30 parts of water to prepare mixed solution B. Add 100 parts of 4-hydroxybutyl vinyl ether polyoxyethylene ether, 3 parts of disodium hydrogen phosphate and 50 parts of water into the reaction kettle; adjust the reaction temperature to 10°C, add 3 parts of peracetic acid at one time, and stir to make It dissolves. Add mixed solution A and mixed solution B dropwise at the same time respectively, and the dropping time is 3 hours; after the dropping is completed, 0.3 parts of ascorbic acid can be added at one time, and the reaction can be continued for 1 hour; finally, 15 parts of sodium hydroxide solution with a mass co...

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PUM

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Abstract

The invention discloses a low-temperature preparation method of a highly adaptable ether polycarboxylate water reducer, the steps of which include mixing unsaturated carboxylic acid, unsaturated sulfonate, unsaturated phosphonic acid, chain transfer agent and water Solution A; mix reducing agent a and water into mixed solution B; add unsaturated polyoxyethylene ether, buffer and water into the reaction kettle; adjust the reaction temperature to 10-40°C, add the oxidant at one time, stir to make it Dissolve; drop mixed solution A and mixed solution B respectively at the same time; after the dropwise addition, add 0-0.5 parts of reducing agent b at one time, and continue to react for 1-2 hours; finally add 10-20 parts of hydrogen with a mass concentration of 30% Sodium oxide solution is neutralized to obtain the polycarboxylate water reducer. The method of the invention is simple, and the prepared water reducer can have high dispersion performance with a low dosage. A low-temperature high-efficiency reducing agent is introduced to realize the low-temperature polymerization of polycarboxylic acid and improve the conversion rate of the product.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a low-temperature preparation method of a highly adaptable ether polycarboxylate water reducer. 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 and high durability, and can meet the application in many special cases. Polycarboxylate superplasticizer with hyperdispersive properties has become an indispensable component in high performance concrete. [0003] In the preparation process of polycarboxylate water reducer, the polymerizable structural unit can be synthesized into a water reducer with predetermined structure and performance through free radical copolymerization according to the principle of molecular design, usually composed of carboxylic acid group, sulfonic acid group, ester group It is synthesized by free radi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F230/02C08F220/14C08F220/28C08F4/40C08F2/38C04B24/16C04B24/26C04B103/30
CPCC04B24/16C04B24/26C08F2/38C08F220/06C08F220/14C08F4/40C08F228/02C08F230/02C08F283/06C08F220/20
Inventor 方云辉蒋卓君柯余良林艳梅苏晋升钟丽娜张小芳陈小路郭鑫祺林添兴
Owner KZJ NEW MATERIALS GROUP CO LTD