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Preparation method of amphoteric polycarboxylate-type slump loss resistance agent

An amphoteric polycarboxylic acid and slump-retaining agent technology, applied in the field of concrete functional admixtures, can solve the problem of insufficient slump retention time, too fast release of slump retention performance, and difficulty in meeting the requirements of long-term, long-distance transportation and construction of fresh concrete. problems, to achieve the effect of improving work adaptability

Inactive Publication Date: 2018-10-02
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the differences in concrete raw materials, especially cement, the above-mentioned conventional polycarboxylate slump-retaining agents often have the problem of too fast release of slump-retaining performance and insufficient slump-retaining time in engineering applications, which is difficult to meet the long-term and long-distance transportation of fresh concrete. and construction needs

Method used

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  • Preparation method of amphoteric polycarboxylate-type slump loss resistance agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a 1L glass flask, add 300g deionized water, 350g methallyl polyoxyethylene ether (molecular weight 2400), 1.8g hydrogen peroxide (27.5%), and mix well. Turn on the stirring and raise the temperature to 60°C. Begin to drop mixed solution A (composed of: 10g acrylic acid+20g hydroxyethyl acrylate+50g 2-methacryloyloxyethyl phosphorylcholine+100g deionized water) and mixed solution B (made up of: Vc 0.9g + 1.5g 2-mercaptopropionic acid+ 160g deionized water), evenly added dropwise within 3 hours. After holding at 60°C for 1 hour, the solution was cooled to 40-50°C. Add appropriate amount of deionized water and 32% NaOH, adjust the system to about pH 6.0, and prepare the amphoteric polycarboxylate superplasticizer aSP-1 with a solid content of 40%.

Embodiment 2

[0023] In a 1L glass flask, add 150g deionized water, 320g allyl polyoxyethylene ether (molecular weight 1200), 50g maleic anhydride, and mix well. Turn on the stirring and raise the temperature to 75°C. Start to drop mixed solution A (composed of: 6g hydroxyethyl acrylate + 25g 2-methacryloyloxyethyl phosphorylcholine + 4g sodium methallylsulfonate + 200g deionized water) and mixed solution B respectively (Composition: 10g sodium persulfate+180g deionized water), the uniform dropwise addition was completed within 2 hours. After holding at 75°C for 1 hour, the temperature of the solution was lowered to 40-50°C. Add appropriate amount of deionized water and 32% NaOH, adjust the system to about pH 6.0, and prepare the amphoteric polycarboxylate superplasticizer aSP-2 with a solid content of 40%.

Embodiment 3

[0025] In a 1L glass flask, add 250g of deionized water, 360g of prenyl polyoxyethylene ether (molecular weight 3000), 1.0g of hydrogen peroxide (27.5%), and mix well. Turn on the stirring and raise the temperature to 25-30°C. Begin to drop mixed solution A (composed of: 8g acrylic acid+25g hydroxypropyl acrylate+65g 2-methacryloyloxyethyl phosphorylcholine+100g deionized water) and mixed solution B (made up of: Vc 0.5g + 2.3g mercaptoacetic acid + 100g deionized water), the uniform dropwise addition was completed within 2 hours, and the system automatically heated up to 40-45°C during the polymerization process. After holding at 40-45°C for 2 hours, add an appropriate amount of deionized water and 32% NaOH to adjust the system to about pH 6.0 to prepare an amphoteric polycarboxylate-type water reducer aSP-3 with a solid content of 40%.

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Abstract

The invention discloses a preparation method of an amphoteric polycarboxylate-type slump loss resistance agent. With 2-methacryloyloxyethyl phosphorylcholine, unsaturated long-chain polyether, unsaturated carboxylic acid and hydroxyl acrylate as monomer raw materials, under the function of an initiator and a chain transfer agent, the amphoteric polycarboxylate-type slump loss resistance agent is prepared by adopting an aqueous polymerization process. Compared with conventional polycarboxylate-type slump loss resistance agents, the prepared amphoteric polycarboxylate-type slump loss resistanceagent has longer slump loss resistance release time and better slump loss resistance performance, and can well meet the requirements of newly-mixed concrete for long-time and long-distance transportation and construction.

Description

technical field [0001] The invention relates to a preparation method of a slump-retaining agent, belonging to the field of concrete functional admixtures. Background technique [0002] Polycarboxylate slump retaining agent is a functional admixture commonly used in concrete production. Generally speaking, it is a comb-shaped structure obtained by free radical polymerization of monomers such as unsaturated long-chain polyethers and unsaturated carboxylic acids and hydroxyacrylates (including acrylic acid / hydroxyethyl / propyl methacrylate, etc.). Water-soluble polymer. In the alkaline slurry of freshly mixed concrete, the ester group of the neutral acrylic acid / hydroxyethyl methacrylate structural unit undergoes a hydrolysis reaction, releasing a new negatively charged acrylic acid / methacrylic acid structural unit, The molecules of the slump-retaining agent are gradually adsorbed to the surface of the exposed cement particles, thereby producing a new steric hindrance effect a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F230/02C08F228/02C04B24/24C04B24/16C04B103/30
CPCC04B24/165C04B24/246C04B2103/308C08F283/065C08F220/06C08F220/281C08F230/02C08F228/02
Inventor 査炎鹏孔韬马强昂源刘俊元王万金
Owner BEIJING ACAD OF BUILDING ENG
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