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Method for synthesizing polycarboxylic acid plastic-retaining agent at low temperature

A technology of polycarboxylate and plastic-preserving agent, which is applied in the field of concrete additives, can solve the problems such as polycarboxylate plastic-preserving agent that have not been found, and achieve the effects of improving compressive strength, high water-reducing performance, and reducing costs

Inactive Publication Date: 2015-06-17
杨绪杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No method for synthesizing polycarboxylate plasticizers at room temperature has been found

Method used

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  • Method for synthesizing polycarboxylic acid plastic-retaining agent at low temperature
  • Method for synthesizing polycarboxylic acid plastic-retaining agent at low temperature
  • Method for synthesizing polycarboxylic acid plastic-retaining agent at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Low-temperature preparation of plastic retaining agent of the present invention (environment temperature is -10°C)

[0028] (a) Prenyl polyether (x=52, R in general formula (1) 3 H) Stir and dissolve together with an aqueous solution of ethylene glycol with a mass concentration of 20% to prepare 300 g of a solution with a mass concentration of 65%;

[0029] (b) Add 4.2g of Diaobai powder to the solution obtained in step (a), stir evenly and configure it as a base material;

[0030] (c) Add water to methacrylic acid to form an aqueous solution B95g with a mass concentration of 20%;

[0031] (d) Add 3.5g of hydrogen peroxide (30%), 0.8g of initiator ammonium persulfate and water to form a 40g aqueous solution, then add 3g of isopropanol, 0.1g of vinyl acetate, and 0.9g of mercaptoacetic acid, and stir evenly to form a solution A44g;

[0032] (e) Add solution A and solution B dropwise to the bottom material at the same time at ambient temperature. The dropping time of s...

Embodiment 2

[0034] Normal temperature preparation of plastic retaining agent of the present invention (ambient temperature 35°C)

[0035] (a) Prenyl polyether (x=40, R in general formula (1) 3 for -CH 3 ) was stirred and dissolved with water to prepare 300g of a solution with a mass concentration of 65%;

[0036] (b) Add 1.5g of vitamin C to the solution obtained in step (a), stir evenly and configure it as a base material;

[0037] (c) Add acrylic acid and water to form 75g of aqueous solution B with a mass concentration of 18%;

[0038] (d) Add 2.8g of hydrogen peroxide (30%), 1.6g of initiator potassium persulfate and water to make 40g of aqueous solution, then add 1.6g of isopropanol, 0.6g of sodium methacrylate, and 0.8g of mercaptopropionic acid, and stir well , configured into a solution A43g;

[0039] (e) Add solution A and solution B dropwise to the bottom material at the same time at ambient temperature. The dropping time of solution A is controlled at 3.5 hours, and the dro...

Embodiment 3

[0041] Low-temperature preparation of plastic retaining agent of the present invention (environment temperature is -10°C)

[0042] (a) Prenyl polyether (x=25, R in general formula (1) 3 for -CH 3 ) and an aqueous solution of ethylene glycol with a mass concentration of 10% were stirred and dissolved to prepare 300 g of a solution with a mass concentration of 65%;

[0043] (b) Add 2.5g of Diaobai powder to the solution obtained in step (a), stir evenly and prepare 302.5g of base material;

[0044] (c) Add water to maleic acid to prepare 95g of aqueous solution B with a mass concentration of 70%;

[0045] (d) Add 3.8g of hydrogen peroxide (30%), 0.8g of initiator potassium persulfate and water to make 40g of aqueous solution, then add 1g of isopropanol, 0.3g of chain transfer agent vinyl acetate, and 0.5g of mercaptoacetic acid in sequence, and stir evenly , configured into solution A41.8g;

[0046] (e) Add solution A and solution B dropwise to the bottom material at the sam...

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Abstract

The invention relates to a method for synthesizing a polycarboxylic acid plastic-retaining agent at low temperature. The method comprises the following steps of: (a) adding water or an ethylene glycol water solution in isopentene group polyether to prepare a solution; (b) adding rongalite or vitamin C in the solution and evenly stirring to prepare a base material; (c) adding water in organic acid to prepare a water solution B; (d) preparing another water solution from hydrogen peroxide and initiator and then adding isopropyl alcohol and a chain transfer agent in the water solution to prepare a solution A; and (e) adding the solutions A and B in the base material, stirring for a reaction, and then adjusting the pH to 6.5-7.0, thus obtaining a product. By virtue of the method, the comb-shaped high-water-reduction type polycarboxylic acid plastic-retaining agent can be synthesized in one step within the temperature range from minus 10 DEG C to 60 DEG C. The control on the synthesizing reaction temperature is not needed, normal temperature is available, the preparation technology is simple, the reaction time is short, the lowest reaction temperature can be low to minus 10 DEG C and extra heat energy is not needed even in a cold winter, the reaction temperature can freely rise and decline along with the heat effect process of a reaction system, and the energy consumption is low.

Description

technical field [0001] The invention belongs to the field of concrete additives, and in particular relates to a low-temperature synthesis method of a polycarboxylate plastic retainer capable of maintaining good concrete plasticity. Background technique [0002] The water reducing agent can improve the workability and rheology of concrete, and can reduce the water consumption of concrete, reduce the water-cement ratio, and save the amount of unilateral cement without affecting the workability and rheology. Water reducing agent has become the fifth necessary component in concrete besides cement, sand, stone and water. At present, carboxylic acid polymer water reducer is one of the most widely used water reducers. The traditional carboxylic acid polymer water reducer mainly uses the long side chains with hydrophilic polyoxyethylene groups to form a comb structure on the surface of cement particles, and uses the steric hindrance effect of the long side chains to control the dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F2/38C04B24/26
Inventor 杨绪杰
Owner 杨绪杰
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