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Reduced and reinforced type polycarboxylate having high water-reducing rate and preparation method thereof

A high water-reducing rate, polycarboxylate technology, applied in the field of high water-reducing rate polycarboxylate and its preparation, can solve the problems of lack of shrinkage reduction, enhancement, and inability to reduce the surface tension of aqueous solutions, and achieve excellent Water reduction and slump retention effect, obvious shrinkage reduction effect, and compressive strength improvement effect

Active Publication Date: 2015-07-01
史才军
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN102936109A discloses a polycarboxylate water reducer and its preparation method and application. CN102826784A discloses a polycarboxylate water reducer and its preparation method. The raw materials include acrylic acid, polyether, amide, malay Anhydride, the method uses a redox system as an initiator, and the ratio of raw materials is different from that of the present invention, so the product synthesized has a different degree of polymerization, grafting sequence, and molecular structure from the product of the present invention, and does not have shrinkage reduction and strengthening effects; Its raw materials also include unsaturated sulfonate ionic surfactants, which cannot reduce the surface tension of aqueous solutions

Method used

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  • Reduced and reinforced type polycarboxylate having high water-reducing rate and preparation method thereof
  • Reduced and reinforced type polycarboxylate having high water-reducing rate and preparation method thereof
  • Reduced and reinforced type polycarboxylate having high water-reducing rate and preparation method thereof

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Effect test

Embodiment 1

[0026] The preparation method of the shrinkage-reducing enhanced high water-reducing rate polycarboxylate of this embodiment is as follows:

[0027] (1) Radical polymerization: 21.6 g of methacrylic acid, 120 g of allyl polyoxyethylene ether with an average molecular weight of 2400, 2 g of acrylamide, 15 g of maleic anhydride and 350 g of deionized water were added to the reactor, under nitrogen protection Stir evenly, heat up to 65°C, add ammonium persulfate aqueous solution (1.6g ammonium persulfate dissolved in 100g water) and thioglycolic acid aqueous solution (1g thioglycolic acid dissolved in 100g water) dropwise at a rate of 1mL / min, and keep stirring for 3 h , keep warm for 1 h at 55°C;

[0028] (2) Cooling and neutralization: Cool to room temperature, and adjust the pH value to 7 with 1mol / L NaOH aqueous solution to obtain a shrinkage-reducing enhanced high water-reducing polycarboxylate, which is designated as water-reducing agent SP1.

[0029] The infrared spectrog...

Embodiment 2

[0031] The preparation method of the shrinkage-reducing enhanced high water-reducing rate polycarboxylate of this embodiment is as follows:

[0032] (1) Free radical polymerization: 21.6 g of methacrylic acid, 130 g of allyl polyoxyethylene ether with an average molecular weight of 3400, 1 g of acrylamide, 18 g of maleic anhydride and 300 g of deionized water were added to the reactor, under nitrogen protection Stir evenly, heat up to 70°C, add ammonium persulfate aqueous solution (1.6g ammonium persulfate dissolved in 100g water) and thioglycolic acid aqueous solution (1g thioglycolic acid dissolved in 100g water) dropwise at a rate of 2mL / min, and continue stirring for 4 h , keep warm for 1.5 h at 60°C;

[0033] (2) Cooling and neutralization: Cool to room temperature, and adjust the pH value to 7 with 1mol / L NaOH aqueous solution to obtain a shrinkage-reducing enhanced high water-reducing polycarboxylate, which is designated as water-reducing agent SP2.

Embodiment 3

[0035] The preparation method of the shrinkage-reducing enhanced high water-reducing rate polycarboxylate of this embodiment is as follows:

[0036](1) Radical polymerization: 21.6 g of methacrylic acid, 150 g of allyl polyoxyethylene ether with an average molecular weight of 4000, 1.5 g of acrylamide, 12 g of maleic anhydride and 250 g of deionized water were added to the reactor, under nitrogen protection Stir evenly, heat up to 75°C, add ammonium persulfate aqueous solution (1.6g ammonium persulfate dissolved in 100g water) and thioglycolic acid aqueous solution (1g thioglycolic acid dissolved in 100g water) dropwise at a rate of 3mL / min, and keep stirring for 4 h , keep warm for 2 hours at 65°C;

[0037] (2) Cooling and neutralization: Cool to room temperature, and adjust the pH value to 7 with 1mol / L NaOH aqueous solution to obtain a shrinkage-reducing enhanced high water-reducing polycarboxylate, which is designated as water-reducing agent SP3.

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Abstract

The invention relates to reduced and reinforced type polycarboxylate having high water-reducing rate and a preparation method thereof. The preparation method comprises the following steps of: (1), carrying out free radical polymerization: adding methacrylic acid, allyl polyoxyethylene ether, acrylamide, maleic anhydride and deionized water into a synthesis reactor according to parts by weight, uniformly stirring and mixing under the protection of nitrogen, heating to 50-90 DEG C, respectively dropping ammonium persulfate aqueous solution and mercaptoacetic acid aqueous solution with the rate of 0.5-8 mL / min, continuously stirring for 2-8 h, and keeping the temperature at 40-80 DEG C for 0.5-5 h; and (2), cooling and neutralizing: adjusting pH to 6-8 after cooling to room temperature so as to obtain the reduced and reinforced type polycarboxylate having high water-reducing rate. The reduced and reinforced type polycarboxylate having high water-reducing rate prepared by the preparation method disclosed by the invention has high water-reducing rate; the surface tension of aqueous solution can be greatly reduced; the reduced and reinforced type polycarboxylate has the obvious function of reducing cement mortar; and, the early and later strength of the cement mortar can be increased with the same water cement ratio.

Description

technical field [0001] The invention relates to a polycarboxylate with a high water-reducing rate and a preparation method thereof, in particular to a shrinkage-reducing enhanced polycarboxylate with a high water-reducing rate and a preparation method thereof. Background technique [0002] With the development of concrete engineering construction fields such as railways, bridges, water conservancy and hydropower, etc., the demand for high-performance concrete continues to increase, and various concrete admixtures are also constantly developing. Water reducing agent can reduce mixing water consumption, thereby greatly improving concrete strength and durable working performance; it can control the flow performance of concrete, which is convenient for transportation, pouring and construction; it can be used to prepare pumping concrete, self-compacting concrete, high-strength and high-performance concrete It is the most important and widely used concrete admixture in concrete ad...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/06C08F220/56C08F222/06
Inventor 史才军龙兰张相雷
Owner 史才军
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