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A low-sensitivity shrinkage-reducing polycarboxylate water reducer and its preparation method

A polycarboxylic acid, low-sensitivity technology, applied in the field of construction admixtures, can solve the problems of poor slump retention, unstable sand and gravel materials, lack of natural sand and stone resources, etc., to reduce concrete shrinkage, excellent water reduction effect, The effect of highlighting the slump protection effect

Active Publication Date: 2020-12-29
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of the economy, my country's real estate market and infrastructure construction are also developing at a high speed. A large amount of engineering construction consumes a huge amount of cement and sand, which intensifies the tension in the supply of sand and gravel resources. Natural sand, sand and gravel in many areas of the country Stone resources are increasingly scarce, and the supply of sand and gravel materials is in short supply, resulting in the problems of extremely unstable sand and gravel materials and high and unstable sand and gravel mud content. Insufficient water reducing rate, poor slump retention, and sensitivity to mud content

Method used

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  • A low-sensitivity shrinkage-reducing polycarboxylate water reducer and its preparation method
  • A low-sensitivity shrinkage-reducing polycarboxylate water reducer and its preparation method
  • A low-sensitivity shrinkage-reducing polycarboxylate water reducer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Esterification reaction: Mix 120.00g of methoxypolyethylene glycol with a molecular weight of 1200 and 27.00g of p-hydroxybenzoic acid, under the protection of nitrogen, heat up to 110°C, add 1.60g of p-toluenesulfonic acid, heat preservation reaction 1.0 h, lower the temperature to 70°C, add 60.00g of acrylic acid, 1.25g of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl radical and 0.50g of the second catalyst, keep the temperature for 2.0h, during which The method of vacuumizing with water is used to remove water, and after the reaction is completed, it is lowered to room temperature to obtain the first mixture containing esterification product and unreacted acrylic acid;

[0033] (2) Monomer blending: 200.00 g of the first mixture prepared in step (1) was mixed with 2.00 g of 2-(trifluoromethyl)acrylic acid, and 100.00 g of water was added to dissolve it to obtain a comonomer mixture solution;

[0034] (3) Copolymerization reaction: the above-mentioned comonomer ...

Embodiment 2

[0037](1) Esterification reaction: Mix 200.00g of methoxypolyethylene glycol with a molecular weight of 2000 and 35.00g of p-hydroxymethylbenzoic acid, under the protection of nitrogen, heat up to 120°C, add 2.80g of benzenesulfonic acid, and keep warm for reaction 1.5h, cool down to 80°C, add 60.00g of methacrylic acid, 0.90g of 2,2-di(4-tert-octylphenyl)-1-picrylhydrazyl radical and 0.8g of the second catalyst, keep the reaction for 3.0h During the process, water is removed by the method of purging nitrogen with water, and the reaction is cooled to room temperature after completion of the reaction to obtain the first mixture containing esterified product and unreacted methacrylic acid;

[0038] (2) Monomer blending: 200.00 g of the first mixture prepared in step (1) was mixed with 3.00 g of 2-fluoroacrylic acid, and 100.00 g of water was added to dissolve it to obtain a comonomer mixture solution;

[0039] (3) Copolymerization reaction: the above-mentioned comonomer mixture ...

Embodiment 3

[0042] (1) Esterification reaction: Mix 240.00g of methoxypolyethylene glycol with a molecular weight of 2400 and 40.00g of p-hydroxybenzenesulfonic acid, under the protection of nitrogen, heat up to 125°C, add 6.80g of p-toluenesulfonic acid, and keep warm for the reaction 2.0h, cool down to 75°C, add 35.00g of maleic acid, 25.00g of acrylic acid, 0.60g of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl radical and 1.00g of the second catalyst, Insulation reaction for 1.5h, during which the water was removed by vacuuming with water, and after the reaction was completed, it was lowered to room temperature to obtain the first mixture containing the esterification product and unreacted maleic acid and unreacted acrylic acid;

[0043] (2) Monomer blending: 200.00 g of the first mixture prepared in step (1) was mixed with 4.00 g of 2-(trifluoromethyl)acrylic acid, and 100.00 g of water was added to dissolve it to obtain a comonomer mixture solution;

[0044] (3) Copolymerization re...

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Abstract

The invention discloses a low-sensitivity shrinkage reducing type polycarboxylic acid water reducer and a preparation method thereof. The molecular weight of the effective component of the water reducer is 10,000 to 150,000, and the structural formula of the effective component is shown in the description. A rigid benzene ring structure is introduced to the linkage position of a branch chain and amain chain, so the low-sensitivity shrinkage reducing type polycarboxylic acid water reducer has an expanded conformation in a solution, has a large molecular size, and is not prone to be adsorbed tothe interlayer of clay having a layered structure and weaken the water reducing performance, thereby the low-sensitivity shrinkage reducing type polycarboxylic acid water reducer has a low sensitivity to mud content.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a low-sensitivity shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Due to its excellent water reducing performance and easy functional design, polycarboxylate superplasticizer has become the most widely used superplasticizer product in my country. [0003] With the rapid development of the economy, my country's real estate market and infrastructure construction are also developing at a high speed. A large amount of engineering construction consumes a huge amount of cement and sand, which intensifies the tension in the supply of sand and gravel resources. Natural sand, sand and gravel in many areas of the country Stone resources are increasingly scarce, and the supply of sand and gravel materials is in short supply, resulting in the problems of extremely unstable sand and gravel materials and hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/24C08F220/22C08F222/06C04B24/26C04B103/30
CPCC04B24/2605C04B24/2694C04B2103/302C08F283/065C08F220/06C08F220/24C08F220/22C08F222/06
Inventor 蒋卓君郭鑫祺官梦芹陈晓彬李祥河林添兴郭元强麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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