Super controlled release type polycarboxylate slump retention agent and preparation method thereof

An ultra-slow-release polycarboxylic acid technology, applied in the field of ultra-slow-release polycarboxylic acid slump-retaining agent and its preparation, can solve the problems of high numerical value and complex production process, and achieve simple feeding procedures, simple process, and reduction The effect of low water rate

Active Publication Date: 2014-12-24
YUEYANG ORIENTAL YUHONG WATERPROOF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention greatly improves the slump retention performance of concrete at a lower dosage, the value of the lower dosage is still higher. At the same time, the production process is more complicated due to the introduction of nitrogen gas during the production process.

Method used

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  • Super controlled release type polycarboxylate slump retention agent and preparation method thereof
  • Super controlled release type polycarboxylate slump retention agent and preparation method thereof
  • Super controlled release type polycarboxylate slump retention agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 120.00 parts of isopentenyl polyoxyethylene ether with a molecular weight of 2400 and 75 parts of water into a reaction container, raise the temperature, stir at a temperature of 50±5°C to completely dissolve the reactants, and then add polyethylene glycol into the container. Diol maleic acid monoester 12g, add dropwise the aqueous solution of 7.2 parts of acrylic acid + 1.09 parts of sodium methacrylate + 22.75 parts of hydroxypropyl acrylate + 31.04 parts of water and 45.00 parts of 5% ammonium persulfate solution, and control the dripping Acceleration, drop at 120±10 minutes and 150±10 minutes respectively, keep the temperature at 50±5°C, and continue the reaction for 1 hour. After cooling, add about 5 parts of 30% sodium hydroxide solution to adjust the pH to 6.5±0.5 to obtain the 50% polycarboxylate high-performance concrete water reducer of the present invention.

Embodiment 2

[0025] Put 120.00 parts of isopentenyl polyoxyethylene ether with a molecular weight of 2400 and 75 parts of water into a reaction container, raise the temperature, and stir at a temperature of 65±5°C to completely dissolve the reactants, and then add polyethylene glycol into the container. 12 parts of diol maleic acid diester, dropwise add 7.2 parts of acrylic acid + 1.09 parts of sodium methacryl sulfonate + 22.75 parts of vinyl acetate + 31.04 parts of water and 45.00 parts of 5% ammonium persulfate solution, dropwise Acceleration, drop at 120±10 minutes and 150±10 minutes respectively, keep the temperature at 50±5°C, and continue the reaction for 1 hour. After cooling, add about 5 parts of 30% sodium hydroxide solution to adjust the pH to 6.5±0.5 to obtain the 50% polycarboxylate high-performance concrete water reducer of the present invention.

Embodiment 3

[0027]Put 120.00 parts of isopentenyl polyoxyethylene ether with a molecular weight of 2400 and 71 parts of water into a reaction container, raise the temperature, stir at a temperature of 50±5°C to completely dissolve the reactants, and then add polyethylene glycol into the container. A total of 12g of diol maleic acid monoester and polyethylene glycol maleic acid diester is added dropwise with an aqueous solution of 7.2 parts of acrylic acid+1.09 parts of sodium methacrylate sulfonate+22.3 parts of hydroxyethyl acrylate+30.59 parts of water and 45.00 parts of 5% ammonium persulfate solution, control the dropping speed, finish dropping at 120±10 minutes and 150±10 minutes respectively, keep the temperature at 50±5°C, and continue the reaction for 1 hour. After cooling, add about 5 parts of 30% sodium hydroxide solution to adjust the pH to 6.5±0.5 to obtain the 50% polycarboxylate high-performance concrete water reducer of the present invention.

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Abstract

The invention discloses a super controlled release type polycarboxylate slump retention agent and a preparation method thereof. The preparation method of the polycarboxylate slump retention agent comprises the following steps: carrying out free radical polymerization on a monomer A, namely polyoxyethylene ether (TPEG), a monomer B, namely maleic anhydride or polyethylene glycol maleic acid esters, a monomer C, namely acrylic acid, a monomer D, namely hydroxyalkyl acrylate or vinyl acetate, an initiator, a chain transfer agent and water, adding an alkaline liquor to neutralize the mixture, wherein a molar ratio of the monomer A to the monomer B to the monomer C to the monomer D is 1 to (1.0-2.5) to (1.0-2.5) to (2.0-4); the dosage of the initiator accounts for 1%-8% of the total mole number of the monomer A, the monomer B, the monomer C and the monomer D; the dosage of the chain transfer agent is 1%-3% of the total mole number of the monomer A, the monomer B, the monomer C and the monomer D. The super controlled release type polycarboxylate slump retention agent disclosed by the invention is in a liquid state, has solid content of 50%, and has performances of low alkaline content, a low water-reducing rate and excellent slump retention performance. Besides, the production process is simple, the reaction conditions are easy to control, and the environmental pollution is avoided.

Description

technical field [0001] The invention relates to a polycarboxylate slump retaining agent and a preparation method thereof, in particular to an ultra-slow-release polycarboxylate slump retainer and a preparation method thereof. Background technique [0002] Compared with high-efficiency water-reducing agents such as naphthalene-based, melamine-based, and sulfamic acid salts, polycarboxylate-based water-reducers have more excellent performance, and the outstanding performance is low dosage, high water-reducing rate, fresh concrete fluidity and The characteristics of good slump retention, low shrinkage, great strengthening potential, and environmental friendliness have become the direction of development and application in recent years and even in the future. At present, polycarboxylate high-performance water reducer has become the representative of the latest product of concrete admixture, and its research and application have been highly valued by professional technicians and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32
Inventor 杨晓峰熊卫锋王虎群
Owner YUEYANG ORIENTAL YUHONG WATERPROOF TECH
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