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Early strength type polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures to achieve the effects of shortening the initial setting time and final setting time, improving the early strength performance and improving the durability performance.

Pending Publication Date: 2019-04-12
广东奥克化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Block macromonomers are mainly used in cement grinding aids, defoamers and other fields. At present, no one in China has proposed the idea of ​​using block macromonomers to copolymerize into high-performance early-strength polycarboxylate superplasticizers.

Method used

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  • Early strength type polycarboxylate superplasticizer and preparation method thereof
  • Early strength type polycarboxylate superplasticizer and preparation method thereof
  • Early strength type polycarboxylate superplasticizer and preparation method thereof

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preparation example Construction

[0026] In the embodiment of the present invention, the preparation method of early-strength polycarboxylate water reducer can specifically include:

[0027] Put 80 parts of deionized water, block unsaturated polyoxyethylene ether, and oxidative initiator into the reactor, stir and dissolve evenly, and heat to 30-60°C; dissolve acrylic acid and functional monomers in 40 parts of deionized water Prepare dropwise liquid material A for later use, dissolve the chain transfer agent and reducing initiator in 40 parts of deionized water to prepare dropwise liquid material B for later use; at the same time, add the prepared material A and B into the reaction kettle dropwise at a uniform speed Material, material A is added dropwise for 3-4 hours, material B is added dropwise for 3.5-5 hours, and the heat preservation reaction is 1-2 hours; add neutralizer to adjust the pH to 6-7, and add the remaining deionized water to a solid content of 40 -50%, to obtain early-strength polycarboxylat...

Embodiment 1

[0035] An early-strength polycarboxylate water reducer, the raw materials are calculated in parts by weight. Put 80 parts of deionized water, 116 parts of block unsaturated polyoxyethylene ether with a molecular weight of 5000, and 0.2 parts of hydrogen peroxide into the reaction kettle, stir and dissolve evenly, and heat to 30-60°C. Dissolve 13 parts of acrylic acid and 1.2 parts of 2-acrylamido-2-methylpropenesulfonic acid in 40 parts of deionized water to prepare dropwise liquid A for later use. Dissolve 0.55 parts of thioglycolic acid and 0.16 parts of vitamin C in 40 parts The deionized water is prepared as the dripping solution B material for later use. At the same time, add the prepared material A and material B dropwise to the reactor at a constant speed, add material A dropwise for 3 hours, add material B dropwise for 3.5 hours, and keep warm for 1 hour. Add 3 parts of 30% sodium hydroxide solution to adjust the pH to 6-7, add 32 parts of deionized water until the so...

Embodiment 2

[0037] An early-strength polycarboxylate water reducer, the raw materials are calculated in parts by weight. Put 80 parts of deionized water, 116 parts of block unsaturated polyoxyethylene ether with a molecular weight of 5000, and 0.2 parts of ammonium persulfate into the reaction kettle, stir and dissolve evenly, and heat to 40°C. Dissolve 13 parts of acrylic acid, 0.4 parts of sodium methallyl sulfonate, and 0.8 parts of acrylamide in 40 parts of deionized water to prepare dropwise liquid A for later use. Dissolve 0.55 parts of mercaptopropionic acid and 0.16 parts of vitamin C in 40 parts One part deionized water is prepared as dropwise liquid B material for subsequent use. At the same time, add the prepared material A and material B dropwise to the reactor at a constant speed, add material A dropwise for 3 hours, add material B dropwise for 3.5 hours, and keep warm for 1 hour. Add 3.2 parts of 30% sodium hydroxide solution to adjust the pH to 6-7, add 33 parts of deioniz...

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Abstract

The invention relates to the technical field of concrete additives in building materials, specifically to an early strength type polycarboxylate superplasticizer and a preparation method thereof. Theearly strength type polycarboxylate superplasticizer is prepared from the following raw materials through a polymerization reaction: block unsaturated polyoxyethylene ether, acrylic acid, a functionalmonomer, a chain transfer agent, an oxidative initiator and a reductive initiator. According to the invention, the block unsaturated polyoxyethylene ether is adopted as a raw material, and a macromolecular block polyether side chain can improve the water-reducing rate performance of a superplasticizer, also exerts the performances of early strength, viscosity reduction and shrinkage resistance, greatly reduces the content of air, shortens the setting time of concrete and has excellent working performance and adaptability.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to an early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, with the continuous launch of national infrastructure construction and the formulation of urbanization policies and guidelines, the amount of concrete used in my country will continue to maintain a trend of rapid increase. At the same time, while meeting the requirements of existing engineering construction, the demand for high-performance concrete is becoming more and more intense, requiring concrete to have a better early strength development rate to improve the formwork turnover rate, or to meet the strength development under low temperature conditions, Extend the production period of precast concrete into late fall and even winter. For the production of prestressed high-strength pipe piles, it is hoped that autocla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/58C08F228/02C08F4/40C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F4/40C08F283/065C08F220/585
Inventor 郑建民谢中晖鲍凤里余小荣吴朱亮柯建豪朱进建
Owner 广东奥克化学有限公司
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