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Preparation method of powdery polycarboxylic acid high-performance water reducing agent

A polycarboxylic acid and water reducing agent technology, applied in the chemical industry, can solve the problems of fast exothermic rate, increased gel effect, affecting product performance stability, etc., to reduce the generation and accumulation of reaction heat, and to control the production process. , to avoid the effect of the gel effect

Inactive Publication Date: 2015-11-18
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the initiators and monomers of the aforementioned two patents are put into the reactor at one time. In the actual scale-up production, the heat release rate is fast, which leads to a greatly increased chance of gel effect, affects the stability of product performance, and even causes production safety issues

Method used

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  • Preparation method of powdery polycarboxylic acid high-performance water reducing agent
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  • Preparation method of powdery polycarboxylic acid high-performance water reducing agent

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preparation example Construction

[0044] Such as figure 1 As shown, the embodiment of the present invention provides a preparation method of powdery polycarboxylate high-performance water reducer, which is characterized in that the polymerization reaction is divided into two stages, including the following steps, wherein steps 101-103 belong to Pre-polymerization stage, step 104 belongs to the continuation reaction stage:

[0045] Step 101, adding unsaturated polyoxyethylene ether into the reactor, heating up and melting to become liquid;

[0046] Step 102, adjusting the reactor containing the liquid unsaturated polyoxyethylene ether to a certain temperature, and putting an initiator into it;

[0047] Step 103, adding the mixed liquid of the small monomer and the molecular weight modifier dropwise at a constant speed within a certain period of time;

[0048] Step 104, after adding the mixed dripping liquid in the step 103, add the initiator described in the step 101, and continue the reaction for a certain p...

Embodiment 1

[0063] First, add 96g of isobutenyl polyoxyethylene ether (molecular weight: 2400) into the reaction kettle, raise the temperature to 65°C, wait until the isobutenyl polyoxyethylene ether melts and becomes liquid, raise the temperature to 70°C, and put 1.09g of benzyl peroxide into the kettle Acyl, after it dissolves, drop a mixture of acrylic acid and mercaptopropionic acid into the reactor within 3 hours, wherein the acrylic acid is 12.96g, and mercaptopropionic acid is 0.31g. After the dropwise addition, add 0.5 benzoyl peroxide g, the reaction ends after 3 hours of incubation. The reaction product is introduced into a slicer, and the working temperature of the slicer is 70°C. After slicing, a polycarboxylate superplasticizer sheet with a thickness of 1mm is obtained, and then the polycarboxylate superplasticizer sheet is processed at -5°C using an ultrafine pulverizer. Pulverize to obtain a powdery polycarboxylate water reducer with a particle size less than or equal to 0....

Embodiment 2

[0065] After the powdered polycarboxylate water reducer obtained in Example 1 was stored at 30° C. for 30 days, its implementation effect was tested.

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Abstract

The invention provides a powdery polycarboxylic acid high-performance water reducing agent which can be quickly dissolved in water and further provides a polymerization method of the polycarboxylic acid high-performance water reducing agent. The polycarboxylic acid high-performance water reducing agent is obtained through free-radical bulk polymerization of small monomers and unsaturated polyoxyethylene ether in the absence of any solvent, the polymerization technology is simple, the gel effect which can occur during bulk polymerization production can be effectively avoided through polymerization technology design, and the method has the characteristics of controllable production process and stable product performance. Besides, the invention further provides a method for preparing powder, which can be quickly dissolved in water, from polymerization products. The powdery polycarboxylic acid high-performance water reducing agent prepared with the method has cement paste fluidity, retention capacity and concrete application performance similar to those of common liquid polycarboxylic acid water reducing agents, has the characteristic of capability of being quickly dissolved, can be widely applied to the concrete and mortar fields and contains no solvent, and the transportation cost is saved.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, and more specifically, relates to a preparation method of a powdery polycarboxylate high-performance water reducer. Background technique [0002] Concrete has become the foundation of human life and is currently the most widely used building material. Concrete admixture is the fifth component in concrete besides cement, sand, stone and water. It plays a very important role in the application of high performance concrete. Polycarboxylate superplasticizer is a kind of superplasticizer with good comprehensive performance, which has high water reducing rate and good slump retention. At present, polycarboxylate superplasticizers are mostly liquid products with a mass concentration of about 40%. Due to their superior performance, they are increasingly used in various key projects. However, sometimes the construction site is far away, resulting in continuous increase in transportation co...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F222/02C04B24/26C04B103/30
Inventor 王万金昂源贺奎刘俊元贾方方王靖董全霄孔韬李晓飞张巧丽
Owner BEIJING ACAD OF BUILDING ENG
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