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A shrinkage-reducing polycarboxylate water reducer and its preparation method

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of construction admixtures, can solve problems such as poor workability, insufficient water reducing rate, and poor slump retention, and achieve conformational stretching, reducing concrete shrinkage, and large molecular size Effect

Active Publication Date: 2020-09-04
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] However, in recent years, due to the rapid increase in the amount of concrete year by year, a huge amount of cement and sand and gravel have been consumed, which has exacerbated the tension in the supply of natural river resources. Natural river sand resources in many areas of the country are increasingly scarce, and the supply exceeds demand. Water-washed sea sand is used for concrete production. When polycarboxylate superplasticizers are applied to concrete produced with these materials, the problems of insufficient water-reducing rate, poor slump retention, and poor workability also begin to appear.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (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, and keep warm for 1.5 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 reaction for 2.5h, 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;

[0032] (2) Monomer blending: 100.00g of the first mixture prepared in step (1), 2.00g of 2-(trifluoromethyl)acrylic acid and 100.00g of 2-methacryl polyethylene glycol ether with a molecular weight of 2400 Mix, and add 100.00g water to make it dissolve, obtain comonomer mixture solution;

[0033](3) Copol...

Embodiment 2

[0036] (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;

[0037] (2) Monomer blending: 100.00 g of the first mixture prepared in step (1), 3.00 g of 2-fluoroacrylic acid and 100.00 g of 3-methyl-3-butenyl polyethylene glycol ether with a molecular weight of 3000 were mixed , and add 100.00g water to make it dissolve to obtain a comonomer mixture s...

Embodiment 3

[0041] (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;

[0042] (2) Monomer blending: 100.00g of the first mixture prepared in step (1), 4.00g of 2-(trifluoromethyl)acrylic acid and 100.00g of 2-propenyl polyethylene glycol ether with a molecular weight of 1200 were mixed, And add 100.00g water to make it dissolv...

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PUM

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Abstract

The invention discloses a shrinkage reducing type polycarboxylic acid water reducing agent and a preparation method thereof, wherein the effective component has a molecular weight of 10000-150000, andhas a structural formula defined in the specification. According to the present invention, by introducing the fluorocarbon structure into the molecular structure, the shrinkage reducing type polycarboxylic acid water reducing agent can significantly reduce the surface tension of the solution compared with the conventional carbon-carbon structure in the application in concrete, such that the shrinkage reducing type polycarboxylic acid water reducing agent can significantly reduce concrete shrinkage.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has become the main admixture of concrete due to its excellent performance and environmental protection. In recent years, on the one hand, due to the vigorous development of the social economy, domestic urban construction and infrastructure construction have advanced by leaps and bounds, the amount of concrete has increased rapidly year by year, and the corresponding amount of polycarboxylate superplasticizer has also shown a rapid increase; The advancement of the industry has also driven the export of polycarboxylate superplasticizers in my country, further increasing the consumption. [0003] However, in recent years, due to the rapid increase in the amount of concrete year by year, a huge amount of cement an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F283/06C08F220/04C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F290/062C08F220/04
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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