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Preparation method of polycarboxylate water reducer containing polyurea structure

A technology of polycarboxylate and water reducer, which is applied in the field of preparation of polycarboxylate water reducer, which can solve the problems of reducing the impermeability of concrete, increasing the difficulty of concrete construction and quality control, concrete segregation, bleeding, etc.

Active Publication Date: 2022-08-09
山西省建筑科学研究院集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many engineering difficulties have been encountered during the application of polycarboxylate superplasticizers, the most prominent of which is the loss of concrete slump
Due to the large difference in concrete raw materials, during the transportation and construction of concrete, the phenomenon of rapid loss of concrete slump often occurs, which increases the difficulty of concrete construction and quality control
During the construction process, the method of adding water and reshaping is often used to make the concrete have good fluidity, which is easy to pump and pour. However, adding water and reshaping will change the water-cement ratio and air content of the concrete, reduce the impermeability of the concrete, and make the concrete Intensity is severely affected
In addition, by increasing the amount of water reducing agent or adding water reducing agent to reshape the concrete before construction, the concrete can restore better working performance, but increasing the amount of water reducing agent in the initial stage of mixing will cause segregation and bleeding of concrete. Destroy the uniformity of concrete, make the strength of each part of concrete have a large difference, reduce the flexural and compressive strength of concrete
These methods have not effectively solved the problem of excessive concrete collapse.

Method used

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  • Preparation method of polycarboxylate water reducer containing polyurea structure
  • Preparation method of polycarboxylate water reducer containing polyurea structure
  • Preparation method of polycarboxylate water reducer containing polyurea structure

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preparation example Construction

[0028] The present invention provides a preparation method of polycarboxylic acid reduction agent containing polycase structures that contains: under the presence of the cause and chain transfer agent, the acrylic and one end are the polyoxyethylene ether ether of the olene -based polyethylene ether. The water -based polymerized monomer reaction of the monomer and one end is a polycarboxylic acid reduction agent with a polycatite structure.

[0029] According to some embodiments of the present invention, the average molecular weight of the large number of polyoxyethylene ether monomers of the olene group is 1000-3400, preferably 2200-2600.

[0030] According to some embodiments of the present invention, one end is a polyoxyvanoethylene ether large monomer of olene -based polyethylene polyethylene glycol ether, methalineylene glycol ether, and isopionyl polycol polyethylene One or more of oxygenyl ether and isopyl polyoxyethylene ether.

[0031] According to some embodiments of the...

Embodiment 1

[0074] Preparation of unsaturated water polycapus monomers The

[0075]The 200g polyethanes of polyethamine JEFFAMINED-2000, increased to 110 ° C for 1 hour, dropped to room temperature after dehydration and spare. Add 46.62g of dexone diisocyanate (IPDI) and 30g of acetone solvents in a four-port burnt bottle equipped with a mixer and thermometer. , Then the temperature reacted to 30-40 ° C for 1h. After the reaction is over, add 11.60 g of acrylic acid hydroxyl ethyl and 30g acetone solvents, 70 ° C reaction for 2 hours, then add 4.6 g of ethanol acid and react at 70 ° C for 2 hours to seal the remaining NCO. After that, add 614g ionic water and 2g of dulate sodium sulfate (SDS) and 4G OP-10 emulsifiers. In the high shear and dispersing machine, 3000r / min emulsified for 30 minutes. A 30 % end is a hydrophilic polymerization monomer of the pyrene.

[0076] Preparation of polycarboxylic acid water reduction agent mother solution The

[0077] Aquatic solution A with acrylics with...

Embodiment 2

[0079] Prepare polycarboxylic acid water reduction agent PC2 according to the way to embodiment 1. The difference is that one end calculated by the weight of a large monomer of a large monopolyer of isoprene alcohol is a heavier weight of 100 % %. The weight adjustment of the large monomer of water -based polycapus is 5 % by weight. According to the test method described above, the maternal solution of the polycar carboxylic acid reduction agent was performed.

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Abstract

The invention provides a preparation method of a polycarboxylate water reducing agent containing a polyurea structure. The preparation method comprises: in the presence of an initiator and a chain transfer agent, acrylic acid and a polyoxyethylene ether having an alkenyl group at one end are added The monomer and the aqueous polyurea macromonomer having an alkenyl group at one end are reacted to obtain the polycarboxylate water reducing agent containing the polyurea structure. According to the technical solution of the present invention, the prepared polycarboxylate water reducing agent containing polyurea structure not only has improved concrete dispersibility, but also has improved concrete slump retention.

Description

Technical field [0001] The present invention involves the field of concrete water reducing agents. Specifically, it involves a preparation method of polycarboxylic acid reduction agent containing polycase structures. Background technique [0002] Since entering the 21st century, polycarboxylic acid high -performance water reducing agents have the advantages of low doping, high water reduction rate, good collapse, good compatibility with cement, strong molecular design, green and environmental protection. In major projects such as water conservancy, people are favored by people and become the development hotspots and direction of water reduction technology. However, many engineering problems encountered in the application process of polycarboxylic acid water reducing agents. The most prominent is the loss of the landslide of the concrete. Due to the large differences in concrete raw materials, during concrete transportation and construction, the phenomenon of losses of concrete sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F291/12C08F291/06C08F220/06C08G18/75C08G18/66C08G18/50C08G18/34C08G18/10C04B24/26C04B103/30
Inventor 翟现明王卫星陈学锋贾迎泽范向前
Owner 山西省建筑科学研究院集团有限公司