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Mud-resistant and salt-resistant polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of concrete polycarboxylate water reducer, can solve the problems of non-conforming to green energy saving, low conversion rate, complicated process, etc., to increase water reducing effect, reduce production cost, The effect of improving adaptability

Active Publication Date: 2014-05-21
北京联绿技术集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product of the above technical solution is a polyester polycarboxylate water reducer. In the synthesis process, it needs to be esterified first, and then free radical polymerization. The temperature of the esterification process is high, difficult to control, and the conversion rate is not high. The process is relatively complicated. , does not meet the requirements of green energy saving, and most of them have been replaced by the synthesis process of polyether polycarboxylate superplasticizer

Method used

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  • Mud-resistant and salt-resistant polycarboxylate superplasticizer and preparation method thereof
  • Mud-resistant and salt-resistant polycarboxylate superplasticizer and preparation method thereof
  • Mud-resistant and salt-resistant polycarboxylate superplasticizer and preparation method thereof

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Effect test

Embodiment 1

[0031] By mass, 60 parts of allyl polyoxyethylene ether with a molecular weight of 1000, 2 parts of hydrogen peroxide and 40 parts of water were added to the reaction device; 20 parts of acrylic acid, 10 parts of vinyltrimethoxysilane, 10 parts of methallyl Sodium sulfonate, 2 parts of thioglycolic acid, 1 part of vitamin C, and 50 parts of water are evenly mixed and added dropwise to the reaction device, and the addition is completed within 4 hours; the reaction temperature is 50°C, and the total reaction time is 12 hours. After the reaction, cool to 30-40°C, add aqueous sodium hydroxide solution to adjust the pH value and solid content, and obtain a certain concentration of silane-modified polycarboxylate water reducer.

Embodiment 2

[0033] By mass, 90 parts of methallyl polyoxyethylene ether with a molecular weight of 2400 and 70 parts of water were added to the reaction device; 9 parts of methacrylic acid and 1 part of vinyl tris(β-methoxyethoxy) Silane, 0.5 parts of mercaptopropionic acid, and 30 parts of water are mixed evenly and added dropwise to the reaction device, and the dropwise addition is completed within 3 hours; at the same time, 5 parts of ammonium persulfate, 3 parts of potassium bisulfite, and 20 parts of water are mixed evenly and then dropped Added to the reaction device, the dropwise addition was completed within 4 hours; the reaction temperature was 60°C, and the total reaction time was 6 hours. After the reaction, cool to 30-40°C, add aqueous sodium hydroxide solution to adjust the pH value and solid content, and obtain a certain concentration of silane-modified polycarboxylate water reducer.

Embodiment 3

[0035] By mass, 80 parts of methallyl polyoxypropylene ether with a molecular weight of 5000 and 50 parts of water were added to the reaction device; 6 parts of maleic anhydride, 10 parts of γ-methacryloxypropyl trimethoxy Silane, 4 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts of thioglycolic acid and 50 parts of water are mixed evenly and then added dropwise to the reaction device, and the dropwise addition is completed within 2 hours; at the same time, 10 parts of potassium persulfate, 30 parts of water were mixed evenly and then added dropwise to the reaction device, and the dropwise addition was completed within 3 hours; the reaction temperature was 85°C, and the total reaction time was 4 hours. After the reaction is finished, cool to 30-40°C, add potassium hydroxide aqueous solution to adjust the pH value and solid content, and obtain a certain concentration of silane-modified polycarboxylate water reducer.

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Abstract

The invention provides a mud-resistant and salt-resistant polycarboxylate superplasticizer, which is prepared from a monomer mixture comprising a monomer a, a monomer b and a monomer c in a copolymerization manner, wherein the monomer a is one or a mixture of more than two of unsaturated polyethers according with a general formula (A) as shown in the specification; n is an integer of 0-3; m is an integer of 10-90; R1 represents hydrogen or methyl; R2O represents ethyoxyl or propoxy or a mixture thereof; R3 represents hydrogen or methyl or ethyl; the monomer b is an unsaturated acid, an unsaturated anhydride or a mixture thereof; the monomer c is represented by a general formula (B); Y is vinyl, methyl vinyl, acrylyl oxygroup, or methylacryloyl oxygroup; X is chlorine group, methoxyl, ethyoxyl, methoxyethoxy or acetoxyl; k is an integer of 0-3. By adopting the mud-resistant and salt-resistant polycarboxylate superplasticizer provided by the invention, the adaptability of the cement in concrete can be greatly improved, the mud-resistant and salt-resistant effects are improved, and meanwhile, the mud-resistant and salt-resistant polycarboxylate superplasticizer has the advantages of low mixing amount, high water-reducing rate, low slump loss and the like.

Description

technical field [0001] The application relates to a polycarboxylate water reducer for concrete, in particular to a mud and salt resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete is the largest and most widely used building material in the world. For decades, concrete technology has entered a stage of rapid development, and its application fields are further expanding. The application of admixtures is the main way for the progress of concrete technology. Among them, the water reducer is an indispensable chemical admixture to improve the slag-based cementitious materials and concrete products. Significantly improve the comprehensive performance of the product such as workability, compactness, strength and durability, and is the most widely used and the largest amount of admixtures. As a water reducing agent, polycarboxylate superplasticizer has the characteristics of low dosage, high water reducing rate, good flui...

Claims

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Application Information

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IPC IPC(8): C04B24/42C08F283/06C08F230/08C04B103/30
Inventor 齐宾尚百雨李建勇马雪英程东惠
Owner 北京联绿技术集团有限公司
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