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Poly-carboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of complicated operation, little improvement in performance and high product performance, and achieve the effects of simple synthesis process, strong selectivity and high air-entraining performance.

Active Publication Date: 2012-04-18
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic ester water reducers are mainly produced by esterification of ethylene glycol monomethyl ether with acrylic acid or methacrylic acid, and then copolymerized with unsaturated carboxylic acid. The operation is more complicated, but the obtained product has high performance.
Ether water reducer is directly prepared from acryl alcohol polyether monomer and unsaturated carboxylic acid. It is easy to operate, but the product performance is poor and needs to be improved.
These two types of water reducer products currently have the problem of large air content. Manufacturers can only compound a large number of defoamers in the product, but the effect is not very good, and the cost is high and the performance is not improved much.

Method used

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  • Poly-carboxylic acid water reducing agent and preparation method thereof
  • Poly-carboxylic acid water reducing agent and preparation method thereof
  • Poly-carboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] In the reactor, add 54g of water, 100g of monomer A (monohydroxymethyl silicone oil acrylate with a molecular weight of 1500), 36g of monomer B (maleic anhydride), stir and heat to 80°C, and then add the initiator dropwise (2.8 ammonium persulfate and 40g water mixture) and monomer C (1.16g sodium methacrylate and 20g water mixture), the dropping time is 3h, and the aging time is 4h. 30% NaOH aqueous solution is used to adjust the pH value to neutral, and the material is discharged to obtain a high-performance polycarboxylate water-reducer product. The solid content of the obtained product is 40%, and the weight-average molecular weight of the obtained polymer is 12580.

[0035] The structure of monomer A is

[0036]

example 2

[0038] In the reactor, add 54g of water, 180g of monomer A (monohydroxymethyl silicone oil acrylate with a molecular weight of 2500), 66g of monomer B (maleic anhydride), stir and heat to 80°C, and then add the initiator dropwise (3.4 potassium persulfate and 20g water mixture) and monomer C (1.16g methyl acrylate), the dropping time is 3h, the aging time is 4h, cool down to normal temperature after the reaction, and adjust the pH with a NaOH aqueous solution with a mass concentration of 30%. The value is neutral, and the material is discharged to obtain a high-performance polycarboxylate water reducer product. The solid content of the product is 40%, and the weight average molecular weight of the obtained polymer is 17400.

[0039] The structure of monomer A is

[0040]

example 3

[0042] In the reactor, add 70g of water, 120g of monomer A (monohydroxyamino silicone oil acrylate with a molecular weight of 1200), 37g of monomer B (acrylic acid), stir and heat to 70°C, and then dropwise add the initiator (7.8 ammonium persulfate and 20g water mixture) and monomer C (2.12g sodium styrene sulfonate and 20g water mixture), the dropping time is 2.5h, the aging time is 3.5h, cool down to normal temperature after the completion of the reaction, and use NaOH with a mass concentration of 30% The pH value of the aqueous solution is adjusted to be neutral, and the material is discharged to obtain a high-performance polycarboxylate superplasticizer product with a solid content of 40% and a weight-average molecular weight of the obtained polymer of 21,700.

[0043] The structure of monomer A is

[0044]

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PUM

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Abstract

The invention provides a concrete poly-carboxylic acid water reducing agent which is a polymer with the weight-average molecular weight of 10000-30000 formed by copolymerization of three monomers of A, B and C, wherein the molar ratio of the monomer A to the monomer B is 0.1-0.5:1,and the molar ratio of the monomer A to monomer C is 5-10:1; the monomer A is monohydroxy silicone oil polyoxyethylene ether acrylate, and the structure is shown in the formula (I) as follows, wherein R1 and R2 are methyl or amino; m is an integral number from 1 to 10; n is the integral number from 13 to 49; the monomer B is one of maleic anhydride, maleic acid, acrylic acid or methylacrylic acid; the monomer C is one of sodium vinyl sulfonate, sodium allyl sulfonate, sodium styrene sulfonate, 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate, methyl acrylate or vinyl acetate. The water reducing agent has the advantages of stable performance, high water reducing rate, strong adaptability of cement, high air entraining performance and no environmental pollution. The invention further provides a preparation method of the water reducing agent, which has the advantages of simple process, strong operationability, low energy consumption and the like.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a concrete high-efficiency water reducer and a preparation method thereof. Background technique [0002] From the late 1960s to the early 1970s, the development of water reducing agents was dominated by high-efficiency water reducing agents represented by naphthalene-based and melamine-based. At this stage, concrete technology was greatly developed, but naphthalene-based and melamine-based water-reducing agents The concrete flow effect of the agent is poor, and the slump changes greatly over time. The problem of concrete slump loss cannot be fundamentally solved by means of multiple addition methods, post-mixing methods, and compounding with retarders. A large amount of industrial waste gas will inevitably cause environmental pollution. Therefore, in order to meet the development needs of concrete technology, the first generation of polycarboxylate superplasticizer came into being. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/12C08F283/06C04B24/26C04B103/30
Inventor 朱建民刘兆滨仲崇纲董振鹏
Owner LIAONING OXIRANCHEM INC
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