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Method for directly synthesizing pure solid high-performance polycarboxylate water-reducer in one step

A pure solid, polycarboxylate technology, applied in the field of polycarboxylate high-performance water reducers, to achieve the effect of reducing process steps, reducing transportation costs, and reducing high-temperature energy consumption

Active Publication Date: 2013-03-27
HUIZHOU JIANKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts the bulk polymerization method, and the whole process does not use any solvent or medium, which effectively solves the problem of structure change or wall-hanging burning caused by high-temperature spray drying after the solvent method is usually used in the past, and enriches the high performance of the synthetic polycarboxylic acid. The preparation method of water reducer

Method used

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  • Method for directly synthesizing pure solid high-performance polycarboxylate water-reducer in one step
  • Method for directly synthesizing pure solid high-performance polycarboxylate water-reducer in one step
  • Method for directly synthesizing pure solid high-performance polycarboxylate water-reducer in one step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]First, add 100g of allyl polyoxyethylene ether (molecular weight: 2000) into the reactor, raise the temperature to 50°C, and when the allyl polyoxyethylene ether is in liquid state, add 4.74g of methacrylic sulfonic acid into the reactor in turn Sodium, 21.62g of acrylic acid, 6.21g of azobisisoheptanonitrile, and the stirring time between each addition is 20 minutes, continue to heat up to 75°C for bulk polymerization, react for 6 hours, stop the reaction, cool to 25°C, and obtain The reaction product of 131.85g pure solid, finally add 307.65g water and dilute to obtain the polycarboxylate superplasticizer that concentration is 30%.

Embodiment 2

[0023] After the polycarboxylate superplasticizer with a concentration of 30% obtained in Example 1 was stored at 7°C for 40 days, its implementation effect was measured.

Embodiment 3

[0025] First, 96g of isobutenyl polyoxyethylene ether (molecular weight: 2400) was added to the reactor, and the temperature was raised to 70°C. When the isobutenyl polyoxyethylene ether was in liquid state, 3.18g of mercaptopropionic acid and 9.29g of formazan were sequentially added to the reactor. Acrylic acid, 0.48g dibenzoyl peroxide, and the stirring time between each addition is 5 minutes, continue to heat up to 95 ° C for bulk polymerization, react for 2.5 hours, stop the reaction, cool to 40 ° C, and obtain 108.95 g of pure Solid reaction product, finally add 163.43g water and dilute to obtain the polycarboxylate superplasticizer that concentration is 40%.

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Abstract

The invention relates to a method for directly synthesizing a pure solid high-performance polycarboxylate water-reducer in one step, belonging to the field of water-reducers. According to the method, the pure solid high-performance polycarboxylate water-reducer is prepared by taking an acrylic compound and unsaturated polyoxyethylene ether as polymerization reaction monomers, adding a molecular weight regulator and carrying out free-radical polymerization reaction under the action of an initiator and under a solvent-free environment. The method disclosed by the invention is strong in controllability, high in polymerization degree, low in cost, environment-friendly and pollution-free, achieves the purpose of preparing the absolutely anhydrous pure solid polycarboxylate water-reducer by bulk polymerization, not only has the fluidity and holding property of cement paste, cement adaptability and concrete application performance which are similar to those of a polycarboxylate water-reducer prepared from a common solution by polymerization and can be prepared into any concentration of solution according to actual demands as the pure solid high-performance polycarboxylate water-reducer prepared by direct polymerization is an anhydrous pure solid, but also is free of postprocessing working procedures, such as heat drying or solvent separation and is more convenient to transport, saved in transport cost and favorable in market competitiveness and application prospect.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate high-performance water reducer for cement concrete, in particular to a specific preparation method for directly synthesizing pure solid anhydrous polycarboxylate high-performance water reducer by one-step free radical copolymerization reaction . Background technique [0002] As the fifth component of modern concrete, polycarboxylate superplasticizer has been widely used in the field of concrete engineering technology due to its excellent low dosage, high slump retention, and large degree of freedom in molecular design. At present, most of the polycarboxylate superplasticizers widely used are solution products with a concentration of 10-50%. Due to the remote distance of some construction sites, the lower solid content will increase the transportation cost, and the wide application of dry powder mortar, so research and development is impossible. Water-pure solid polycarboxylate high-perfor...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F283/06C08F220/06C08F222/02C08F222/06C04B24/26C04B103/30
Inventor 刘晓王子明梁旭朱洁李慧群周姮卢子臣路芳
Owner HUIZHOU JIANKE IND
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