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Polycarboxylic superplasticizer, synthesis method thereof and application method thereof

A technique of polycarboxylate and synthesis method, applied in the field of polycarboxylate water reducer, which can solve problems such as single branch chain length, unsatisfactory ability to lose slump, weak ability to control slump loss, etc.

Active Publication Date: 2010-09-29
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) Single chain length
Studies have shown that if the branched chain length of the polycarboxylate superplasticizer is relatively fixed and the length is not enough, the adaptability of the superplasticizer product to cement is poor, and the ability to control slump loss is not strong
[0006] In addition, the fierce market share competition has made the profit margin of polycarboxylate water reducer products very limited. In order to increase the yield, more and more manufacturers tend to choose lower molecular weight MPEGMA and APEG as polycarboxylates. Synthetic raw materials of acid-based water reducers make the ability of products to control slump loss more and more unsatisfactory

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0031] The synthesis method of the polycarboxylate water reducer with different molecular weights of APEG and MPEGMA as cross-branched polycarboxylate water-reducers proposed by the present invention, the raw materials are APEG with two molecular weights (molecular weights are 500-1000 and 1600-2200 respectively), two kinds of molecular weights MPEGMA (molecular weight 800-1400 and 2000-2500), maleic anhydride, acrylic acid, alkylphenol polyoxyethylene ether, hydrogen peroxide, ascorbic acid, ferrous sulfate, sodium persulfate, sodium hydroxide and deionized water, specifically The steps are:

[0032] 1) Raw material ratio: according to the mass ratio 100: (40-80): (120-180): (20-60): (40-500): (200-800): (600-1700), weigh raw materials APEG (molecular weight 500-1000), APEG (molecular weight 1600-2200), MPEGMA (molecular weight 800-1400), MPEGMA (molecular weight 2000-2500), maleic anhydride, acrylic acid and deionized water are added to the reactor in turn and heated to 60°...

Embodiment 1

[0046] According to the mass ratio of 100:40:120:20:40:200:600, weigh APEG with a molecular weight of 500-1000, APEG with a molecular weight of 1600-2200, MPEGMA with a molecular weight of 800-1400, and APEG with a molecular weight of 2000-2500 MPEGMA, maleic anhydride, acrylic acid and deionized water, pass into nitrogen protection after dissolving, add 0.2% alkylphenol polyoxyethylene ether of the total weight of six kinds of monomers, 0.2% hydrogen peroxide, 0.4% ascorbic acid, at 70 After reacting at ℃ for 3 hours, add 0.1% ferric sulfite and 0.2% sodium persulfate based on the total weight of the six monomers, raise the temperature to 120°C, continue the reaction for 1 hour, and cool down to 80°C. The water reducer is obtained by adjusting the pH value to 7 with a sodium hydroxide solution with a concentration of 20% to 32%.

[0047] Adding the water reducing agent whose solid mass accounts for 0.15% of the weight of the cementitious material in the concrete material, the...

Embodiment 2

[0049] According to the mass ratio of 100:80:180:60:500:800:1700, weigh APEG with a molecular weight of 500-1000, APEG with a molecular weight of 1600-2200, MPEGMA with a molecular weight of 800-1400, and APEG with a molecular weight of 2000-2500 MPEGMA, maleic anhydride, acrylic acid and deionized water, pass into nitrogen protection after dissolving, add the alkylphenol polyoxyethylene ether of 1.2% of the total weight of six kinds of monomers, the hydrogen peroxide of 2%, the ascorbic acid of 3.5%, at 95 After reacting at ℃ for 5 hours, add 0.5% ferric sulfite and 6.0% sodium persulfate based on the total weight of the six monomers, raise the temperature to 180°C, continue the reaction for 3 hours, and cool down to 80°C. The water reducer is obtained by adjusting the pH value to 10 with a sodium hydroxide solution with a concentration of 20% to 32%.

[0050] Adding the water reducing agent whose solid mass accounts for 0.22% of the weight of the cementitious material in the...

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Abstract

The invention discloses a synthesis method of a polycarboxylic superplasticizer. The raw materials for synthesis of the polycarboxylic superplasticizer are APEG of two types of molecular weight (respectively 500-1000 and 1600-2200), MPEGMA of two types of molecular weight (respectively 800-1400 and 2000-2500), maleic anhydride, acrylic acid, alkylphenol ethoxylate, hydrogen peroxide, ascorbic acid, ferrous sulfate, sodium persulfate, sodium hydroxide and deionized water. Since the APEG and MPEGMA of different types of molecular weight are simultaneously adopted as crossing branch chains, the invention not only has a high water-reducing rate, but also maintains good water-reducing rate, has good adaptability to sands and stones with high clay contents, and improves the strength of concrete, Compared with the prior art, the invention has the advantages that the raw materials of the product are easily available, the synthesis process can be easily controlled, the performance of the reaction product is stable, and the cost is reduced by 5-10 percent.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, its synthesis method and use method. Background technique [0002] Polycarboxylate-based water-reducer is a third-generation water-reducer developed after lignosulfonate-based common water-reducers and sulfonated naphthalene-sulfonate-based high-efficiency water-reducers. Due to its low dosage ( Solid accounts for 0.15%-0.25% of the mass of the gelled material), high water-reducing rate (25%-40%), good reinforcement effect (28-day compressive strength ratio greater than 120%), and no formaldehyde is used in the synthesis process so it is environmentally friendly Strong and other characteristics, known as high-performance water reducing agent. Since the successful development of this type of water reducer in my country around 2002, it has been recommended for use in high-speed railways, intercity railways, and passenger dedicated line projects (the annual output in 2009 exceeded 1.2 million tons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C04B24/26C04B103/30
Inventor 赵利华黄海燕韩强
Owner GUANGDONG REDWALL NEW MATERIALS
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