Early strength type polycarboxylic acid water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture, can solve the problems of concrete centrifugal dehydration difficulty, long static stop time of pipe piles, and rough inner wall, etc., and achieves easy operation, obvious early strength effect, and high production capacity The effect of low consumption

Inactive Publication Date: 2018-11-23
武汉奥克化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the polycarboxylate superplasticizer has retardation, which leads to long static stop time during the production of pipe piles, serious slurry hanging after centrifugation, rough inner wall, and difficulty in centrifugal dehydration of concrete, etc.

Method used

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  • Early strength type polycarboxylic acid water reducer and preparation method thereof
  • Early strength type polycarboxylic acid water reducer and preparation method thereof
  • Early strength type polycarboxylic acid water reducer and preparation method thereof

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preparation example Construction

[0018] The invention provides an early-strength polycarboxylate water-reducer and a preparation method thereof. Polyether with an early-strength function is used as a synthetic macromonomer, and a polymeric small monomer with an early-strength function is introduced during the synthesis process. According to Based on the principle of free radical polymerization, under the action of oxidation-reduction initiation system, an early-strength polycarboxylate water-reducer is prepared by double-dropping method, which has the performance of significantly improving the early strength of concrete.

[0019] The present invention provides an early-strength polycarboxylate water-reducer, the early-strength polycarboxylate water-reducer has a molecular weight of 40,000-60,000, and its molecular formula is as follows:

[0020]

[0021] In the formula, R 1 = H or CH 2 COOH or CH 3 ;

[0022] R 2 = H or COOH;

[0023] M=H or CH 2 OH or C(CH 3 ) 2 CH 2 SO 3 Na,

[0024] m=0-120, ...

Embodiment 1

[0049] First, 100 parts of polyether macromonomers with a weight average molecular weight of 3800-6000 were weighed and dissolved in water, with a mass concentration of 63.3%. Make it dissolve at 40°C to obtain the first mixed solution,

[0050] Next, 11.75 parts of acrylic acid were mixed to form an aqueous solution to obtain a second mixed solution with a concentration of 67.7%, and 0.12 parts of ascorbic acid and 0.33 parts of thioglycolic acid were mixed to form an aqueous solution to obtain a third mixed solution with a concentration of 1.7%.

[0051] Again, when the temperature is 40°C, add all 0.37 parts of hydrogen peroxide. After 5-10 minutes, start to add the second mixed solution and the third mixed solution dropwise. The second mixed solution is added dropwise for 3 hours, and the third mixed solution is added dropwise for 3 hours. After the mixed solution is dripped, react for 1 hour while keeping the temperature constant, adjust the pH value to 6-7 with lye, and ...

Embodiment 2

[0053] First, 100 parts of polyether macromonomer with a weight average molecular weight of 3800-6000 and 3 parts of acrylic acid were dissolved in water, and dissolved at 25°C to obtain the first mixed solution with a mass concentration of 58%.

[0054] Next, mix 9 parts of acrylic acid to form an aqueous solution to obtain a second mixed solution with a mass concentration of 65%, and mix 0.1 part of ascorbic acid and 0.2 part of mercaptopropionic acid to form an aqueous solution to obtain a third mixed solution with a mass concentration of 1.5%.

[0055] Again, when the temperature is 25°C, add all 0.25 parts of ammonium persulfate. After 5-10 minutes, start to add the second mixed solution and the third mixed solution dropwise. The second mixed solution is added dropwise for 2 hours, and the third mixed solution is added dropwise for 2.5 minutes. hour, after the third mixed solution is dripped, the temperature is kept constant for 1 hour, the pH value is adjusted to 6-7 with l...

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Abstract

The invention discloses an early strength type polycarboxylic acid water reducer and a preparation method thereof. The early strength type polycarboxylic acid water reducer is prepared through steps of synthesizing a macromonomer by utilizing polyether with an early strength function, introducing a polymerized small monomer with the early strength function in a synthesis process and adopting a double-dropping manner according to a free radical polymerization principle under the action of an oxidization-reduction initiation system. The early strength type polycarboxylic acid water reducer provided by the invention has good dispersion performance and has the effect of remarkably improving the early strength; the early strength type polycarboxylic acid water reducer is remarkably better thana common polycarboxylic acid water reducer and a common naphthalene series water reducer for pipe piles.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to an early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the increase of investment in infrastructure construction in my country in recent years, pile foundation materials are widely used in the construction industry. As an important pile foundation material, prestressed high-strength concrete pipe piles have the advantages of high strength grade, large bearing capacity, good impact resistance, and convenient construction, making them widely used in high-rise buildings, long-span bridges, expressways, and ports Widely used in industrial and civil buildings. [0003] At present, the water reducer used in domestic production of prestressed high-strength concrete pipe piles is mainly naphthalene-based water reducer, not polycarboxylate water reducer. The main reason is that the polycarboxylate superplasticizer has retar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B24/16C04B103/30
CPCC04B24/165C04B24/2605C04B24/2694C04B2103/302C08F283/06
Inventor 左国磊潘阳文鸣张栾胡志豪项慧清
Owner 武汉奥克化学有限公司
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