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Crotonic acid system polycarboxylic acid high-performance water reducer

A crotonic acid and water reducing agent technology, applied in the chemical industry, can solve the problems of high production cost, large reactivity gap, poor product dispersion, etc., and achieves improved design flexibility, low cost, and slump retention performance. Good results

Inactive Publication Date: 2012-07-11
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above preparation methods have all adopted (meth)acrylic acid or sodium (meth)allyl sulfonate monomers. At present, the unit price of this class of monomers is high, and the production cost remains high. In addition, maleic anhydride, itaconic acid There is a large gap between the reactivity of carboxylic acid and (meth)acrylic acid, and the prepared product has the defects of poor dispersibility or poor slump retention performance

Method used

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  • Crotonic acid system polycarboxylic acid high-performance water reducer
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  • Crotonic acid system polycarboxylic acid high-performance water reducer

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preparation example Construction

[0062] The present invention also provides a preparation process for the above-mentioned water reducer, wherein the raw materials include monomers in the following weight fractions:

[0063] The first monomer whose structure is represented by formula II accounts for 60-80% of the total mass of the monomer, and the average molecular weight of the first monomer is 800-2400;

[0064]

[0065] Formula II

[0066] Among them, R 1 , R 2 , R 3 , R 4 selected from hydrogen or methyl;

[0067] The second monomer, accounting for 20-40% of the total mass of monomers, said second monomer is one or more mixtures of crotonic acid or crotonic acid derivatives;

[0068] The third monomer, accounting for 0-20% of the total mass of monomers, said third monomer is one or a mixture of two or more of carboxylic acid, sulfonic acid, carboxylic acid derivative or sulfonic acid derivative;

[0069] Under the condition of cutting off the air, mix the first monomer and water according to the m...

Embodiment 1

[0098] Add 160 g of methoxypolyethylene glycol and 21 g of crotonic acid into a 250 ml nitrogen-protected four-necked flask, raise the temperature of the system to 130° C., and react for 2 hours to obtain methoxypolyethylene glycol crotonic acid ester.

[0099] Add methoxy polyethylene glycol crotonate 100g, maleic anhydride 24.5g, deionized water 100g in the four-necked flask that is equipped with thermometer, booster stirrer, dropping funnel, condenser, nitrogen protection, will The temperature of the system was raised to 65°C, and at the same time, 3.1g of ammonium persulfate and 30g of crotonic acid were added dropwise to make a solution for 2.5 hours, and 1.2g of thioglycolic acid was made into a solution for 3 hours. ℃, add a certain amount of caustic soda for neutralization, and obtain a light yellow solution with a solid content of more than 20% and a weight-average molecular weight of about 15,000. The structure is shown in formula I.

[0100]

[0101] Formula I

[...

Embodiment 2

[0109] Add 360.0 g of TPEG and 155.0 g of deionized water into a four-neck flask equipped with a thermometer, booster stirrer, dropping funnel, and condenser, protect the system with nitrogen, raise the temperature of the system to 50 ° C, and add ammonium persulfate at the same time 2.5g, 45.2g of crotonic acid and 45.2g of crotonic acid were added dropwise for 2.5 hours, 0.98g of thioglycolic acid was made into solution for 3 hours, and then kept at 65°C for 1h, cooled to 45°C, neutralized by adding a certain amount of caustic soda, and a light yellow solution was obtained , the solid content is more than 40%, the weight average molecular weight is 28500, and the structure is shown in formula I, wherein, X is methylene; R 1 , R 2 is methyl; R 3 , R 4 is hydrogen; M 1 , M 2 is -Na; n=40, a is an integer within the range of 1-2, b is an integer within the range of 3-7, c=0, d=0.

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Abstract

The invention relates to the field of chemical industry, in particular to a crotonic acid system polycarboxylic acid high-performance water reducer. The water reducer is prepared by copolymerizing 60 to 80 mass percent of first monomers, 20 to 40 mass percent of second monomers and 0 to 20 mass percent of third monomers, wherein the first monomers comprise methoxy polyethylene glycol crotonate, methoxy polyethylene glycol mono-crotonate, allylpolyethyleneglycol (APEG) and the like; the second monomers comprise crotonic acid, ethyl crotonate or ethyl crotonate and the like; and the third monomers comprise acrylic acid, methacrylic acid, maleic anhydride, methylmaleic acid, itaconic acid, methyl acrylate, hydroxyethyl acrylate, hydroxy-propyl acrylate, sodium allylsulfonate or acrylamide and the like. a preparation process for the water reducer is simple and low in cost, and the polycarboxylic acid high-performance water reducer with excellent performance can be prepared under the condition of not using high-cost monomers such as methacrylic acid, acrylic acid or 2-acrylamide-2-methylpropanesulfonic acid, sodium methallylsulphonate, sodium allylsulfonate and the like.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a crotonic acid-based polycarboxylic acid high-performance water reducer. Background technique [0002] Cement concrete has become the most used building material in the world. In its production process, concrete admixture is an essential component, and water reducing agent is the most important component of concrete admixture. At present, in the domestic market, the admixtures used are the first, second and third generation products represented by lignin salt series, naphthalene series and polycarboxylic acid. The first-generation product, lignosulfonate, is mostly used in combination with other water-reducing agents due to its low water-reducing rate and the functions of air-entraining and setting retardation; naphthalene-based water-reducing agents have limited Poor adaptability to cement, poor slump retention performance of concrete and other defects; polycarboxylate superpl...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F290/06C08F220/04C08F222/06C08F220/28C08F220/56
Inventor 郑广军夏远英陈景邓均徐庭波李东来沈浩田双倩
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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