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Ether-ester copolymerized 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 admixtures, can solve problems such as affecting project quality, strong adaptability, and sensitivity to water addition, and achieves the effects of wide adaptability, strong adaptability and good adaptability.

Inactive Publication Date: 2018-02-13
上海高铁化学建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application process, there are also some problems, such as too fast loss of slump, poor adaptability, sensitivity to water addition, etc., which restrict the application of polycarboxylate water reducer to a certain extent, and also affect the quality of the project.
[0003] Generally speaking, ether-based water-reducing agents have a high water-reducing rate, but their molecular structure is single and cannot be combined with various molecular structures, so their adaptability is not strong
Lipid water-reducers can carry out some molecular structure combinations, and their water-reducing rate is lower than that of ether-type water-reducers, but they have strong adaptability, and the concrete prepared with them is not easy to segregate and bleed
[0004] Aiming at the problem of poor adaptability of concrete, the previous method of compounding ether polycarboxylate water reducer and lipid water reducer can partially solve the problem. In the case of the situation, the problem is still not well resolved

Method used

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  • Ether-ester copolymerized polycarboxylic acid water reducer and preparation method thereof
  • Ether-ester copolymerized polycarboxylic acid water reducer and preparation method thereof
  • Ether-ester copolymerized polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 300g water, 200g methacryl alcohol polyoxyethylene ether (HPEG2400), 100g methoxypolyoxyethylene ether methacrylate (MPEG1000), 10.0g maleic anhydride and 2.0g hydrogen peroxide in a 1000m1 round bottom three-neck flask as Reaction solution.

[0024] Prepare solution A: mix 18.0g acrylic acid, 1.5g acrylamide, 1.5g mercaptopropionic acid and 40g water and put them in the dropping funnel.

[0025] Preparation of solution B: mix 0.5g of vitamin C and 60g of water and put them in the dropping funnel.

[0026] Stir until the monomers in the flask are dissolved, and raise the temperature to 60°C. Immediately start adding liquid A and liquid B dropwise at the same time. Solution A will be dropped at the same time in 3.0 hours, and solution B will be dropped in 3.5 hours. After continuing to keep warm for 1 hour, add 7.5g32 % sodium hydroxide solution, adjust the pH value of the solution to 6-7, and replenish water to obtain a 40% ether-ester copolymerized polycarboxylate...

Embodiment 2

[0028] Add 300g water, 150g methacryl alcohol polyoxyethylene ether (HPEG2400), 150g methoxypolyoxyethylene ether methacrylate (MPEG1200), 12g maleic anhydride and as reaction bottom liquid in 1000ml round bottom three-neck flask, 2.0g ammonium persulfate and 1.0g hydrogen peroxide.

[0029] Preparation of solution A: Mix 15g of acrylic acid, 3.0g of 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 2.0g of mercaptopropionic acid and 30g of water and put them in the dropping funnel.

[0030] Preparation of solution B: mix 0.8g of Diaobai Kuai and 60g of water and put them in the dropping bottle.

[0031] Stir until the monomers in the flask are dissolved, and raise the temperature to 40°C. Immediately start adding liquid A and liquid B dropwise at the same time. Liquid A drops in 3.0 hours, and liquid B drops in 3.5 hours. After continuing the heat preservation reaction for 1 hour, add 8.0g of 32% sodium hydroxide solution, adjust the pH value of the solution to 6-7, and repl...

Embodiment 3

[0033] Add 300g of water, 180g of isopentenol polyoxyethylene ether (TPEG2400), 120g of methoxypolyoxyethylene ether methacrylate (MPEG1000), 12g of fumaric acid, and 3.0g of ammonium persulfate into a 1000ml round-bottomed three-neck flask as a reaction solution.

[0034] Prepare solution A: mix 18g itaconic acid, 3g N-N dimethylacrylamide, 1.5g mercaptopropionic acid and 40g water and put them in the dropping funnel.

[0035] Preparation of solution B: mix 0.2g of Diaobai Kuai, 0.4g of vitamin C and 60g of water and put them in the funnel of the dropping bottle.

[0036] Stir until the monomers in the flask are dissolved, and raise the temperature to 50°C. Immediately start adding liquid A and liquid B dropwise at the same time. Liquid A drops in 3.0 hours, and liquid B drops in 3.5 hours. After continuing the heat preservation reaction for 1 hour, add 8.0g of 32% sodium hydroxide solution, adjust the pH value of the solution to 6-7, and replenish water to obtain a 40% ethe...

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Abstract

The invention discloses an ether-ester copolymerized polycarboxylic acid water reducer and a preparation method thereof. The method comprises the following steps: putting water, an ester polyether macromer, an ether polyether macromer and a fourth monomer (organic carboxylic acid) into a reaction kettle, and performing stirring until the materials are dissolved; adding an oxidant, performing heating, and dripping prepared liquid A and liquid B at the same time; after heat preservation, adjusting the pH value; and supplementing water until the solid content is 40%, thereby obtaining the ether-ester copolymerized polycarboxylic acid water reducer. The ether-ester copolymerized polycarboxylic acid water reducer provided by the invention copolymerizes an ether side chain and an ester side chain in a polymer, and perfectly combines the high water reducing property of an ether polycarboxylic acid water reducer with the high adaptability of an ester polycarboxylic acid water reducer, therebyobtaining a polycarboxylic acid water reducer with wide and strong adaptability, simple process and excellent performance. The polycarboxylic acid water reducer has good adaptability to different cement and good adaptability to sand and gravel materials with poor quality.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to an ether-ester copolymerized polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the third generation of high-performance concrete admixture, which has the advantages of low dosage, good dispersion, and large degree of freedom in molecular structure. It has been widely used in various concrete projects and achieved good results. . However, in the actual application process, there are also some problems, such as too fast loss of slump, poor adaptability, sensitivity to water addition, etc., which restrict the application of polycarboxylate water reducer to a certain extent, and also affect the quality of the project. . [0003] Generally speaking, ether-based water-reducing agents have a high water-reducing rate, but their molecular structure is single and cannot be combined wit...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F220/58C08F222/02C08F220/54C04B24/16C04B24/26C04B103/30
CPCC08F283/065C04B24/165C04B24/2694C04B2103/0059C04B2103/302C08F220/06C08F222/02
Inventor 王建全
Owner 上海高铁化学建材有限公司
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