Method for preparing viscosity-reduction-type polycarboxylic acid superplasticizer and application of viscosity-reduction-type polycarboxylic acid superplasticizer

A viscous polycarboxylic acid and superplasticizer technology, applied in the field of concrete admixtures, can solve the problems of long emptying time, limited viscosity reduction effect, and difficulty in meeting the requirements of high and ultra-high-strength concrete for low-viscosity construction performance, etc. To achieve the effect of reducing the water-to-binder ratio

Active Publication Date: 2016-03-02
JIANGSU SOBUTE NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in concrete with a water-binder ratio of 0.24, the polycarboxylate superplasticizer has a slump bucket emptying time of more than 39 seconds, and the viscosity-reducing effect is very limited, and it is difficult to meet the requirements of high and ultra-high strength concrete for low viscosity construction. performance requirements

Method used

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  • Method for preparing viscosity-reduction-type polycarboxylic acid superplasticizer and application of viscosity-reduction-type polycarboxylic acid superplasticizer
  • Method for preparing viscosity-reduction-type polycarboxylic acid superplasticizer and application of viscosity-reduction-type polycarboxylic acid superplasticizer
  • Method for preparing viscosity-reduction-type polycarboxylic acid superplasticizer and application of viscosity-reduction-type polycarboxylic acid superplasticizer

Examples

Experimental program
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Effect test

preparation example Construction

[0041] Preparation of monomer b

[0042] Preparation of epoxy-terminated alkyl polyethylene glycol:

[0043] Add 0.5 mol of epichlorohydrin, 0.2 mol of sodium hydroxide, 0.005 mol of phase transfer catalyst tetra-n-butyl ammonium bisulfate, and 0.05 mol of monoalkyl polyethylene glycol in a stirred three-necked flask. Quickly stirred for 5h, filtered, and the filtrate was distilled under reduced pressure to remove excess epichlorohydrin, and the product was tested by HPLC. The conversion rate of monoalkyl polyethylene glycol was 85% to 90%, and the product was then purified by silica gel column chromatography (acetic acid ethyl ester as eluent) for separation and purification to obtain epoxy-terminated alkyl polyethylene glycol with a purity greater than 99%.

[0044] Summary of epoxy-terminated alkyl polyethylene glycol prepared in table 1

[0045] the code

name

End group type

p

molecular weight

E-1

Epoxy terminated methyl polyethylene gl...

Embodiment 1

[0059] In this example, the molar ratio of monomer a, monomer b and monomer c is 4:1:0.5.

[0060] In a 1 L glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen line, 191 g of distilled water and 286.5 g of monomer b-1 were added. Under the protection of nitrogen, the reactor was stirred until it was completely dissolved, and the temperature was raised to 80°C, then 51.63g of acrylic acid, 9.95g of N-vinylpyrrolidone, 0.35g of 3-mercaptopropionic acid and 67g of water were mixed and stirred to form a uniform monomer aqueous solution , and drop it into the reactor at a constant speed, and the dropping time is 5h. At the same time, the initiator solution mixed with 0.35 g of ammonium persulfate and 86 g of water was added dropwise at a constant speed for 5 hours. After the whole solution was added dropwise, continue to keep the constant temperature for 4h, then cool down to 40°C, neutralize the product to about pH=7 with sodium hydroxide, and o...

Embodiment 2

[0062] In this example, the molar ratio of monomer a, monomer b and monomer c is 6.7:1:1.85.

[0063] In a 1 L glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen line, 164 g of distilled water and 245.5 g of monomer b-2 were charged. Under the protection of nitrogen, the reactor was stirred until it was completely dissolved, and the temperature was raised to 75°C, then 28.07g of acrylic acid, 9.14g of sodium methacrylate, 13.77g of 4-vinylpyridine, 0.59g of mercaptoethanol and 87g of water were mixed and stirred to form Uniform monomer aqueous solution was added dropwise to the reactor at a constant speed, and the dropping time was 4 hours. At the same time, the initiator solution mixed with 1.48g of potassium persulfate and 105g of water was added dropwise at a constant speed for 4 hours. After the entire solution was added dropwise, continue to keep the constant temperature for 3 hours, then cool down to 40° C., and neutralize the product...

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Abstract

The invention provides a method for preparing a viscosity-reduction-type polycarboxylic acid superplasticizer and application of the viscosity-reduction-type polycarboxylic acid superplasticizer. The method is simple in operating process, and the prepared polycarboxylic acid superplasticizer is applied to high- and ultrahigh-strength concrete, can be used for effectively lowering the viscosity of concrete and improving the placeability and flow velocity of the concrete and is beneficial to pumping construction. According to the method, the viscosity-reduction-type polycarboxylic acid superplasticizer is prepared through carrying out free-radical copolymerization on a carboxylic monomer a, a branched side chain containing monomer b and a rigid cyclic group containing monomer c which are in the mole ratio of (4-15): 1: (0.5-2). The polycarboxylic acid superplasticizer prepared by the method provided by the invention can serve as a cement dispersant so as to greatly lower the water-cement ratio of concrete; and the polycarboxylic acid superplasticizer can be used for effectively lowering the viscosity of the high- and ultrahigh-strength concrete and improving the placeability and flow velocity of the concrete, so that the pumpability is excellent.

Description

technical field [0001] The invention relates to a preparation method and application of a viscosity-reducing polycarboxylate superplasticizer, belonging to the technical field of concrete admixtures. Background technique [0002] With the development of high-rise, large collapse and lightweight of modern buildings, the construction and quality requirements of concrete are getting higher and higher. High strength, high pumpability and high durability have become the development direction of modern concrete. Compared with ordinary concrete, high-strength concrete (C60-C90) and ultra-high-strength concrete (C100 and above) have significant advantages: they can effectively reduce the structural weight; increase the building area; save materials and energy, reduce construction costs; improve concrete Durability, etc., has good economic and social benefits. At present, the methods to improve the strength of concrete mainly include the use of high-strength cement, increasing the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F226/10C08F222/02C08F226/06C08F212/14C04B24/26C04B103/32
Inventor 杨勇冉千平刘加平毛永琳张茜王秀梅严涵
Owner JIANGSU SOBUTE NEW MATERIALS
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