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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  • Abstract
  • Description
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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 releas

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

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Example Embodiment

[0044] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing a powdered polycarboxylic acid high-performance water reducing agent, which is characterized in that the polymerization reaction is carried out in two stages, including the following steps, of which steps 101-103 belong In the pre-polymerization stage, step 104 belongs to the continuing reaction stage:

[0045] Step 101, adding unsaturated polyoxyethylene ether into a reactor, and melting it into a liquid at a temperature;

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

[0047] Step 103, dropping a mixed liquid of small monomer and molecular weight regulator at a constant speed within a certain period of time;

[0048] Step 104, after the mixed dripping liquid in step 103 is dripped, add the initiator in step 101 and continue to react for a certain period of time;

[0049] In ste...

Example Embodiment

[0062] Example one:

[0063] First, add 96g of isobutenyl polyoxyethylene ether (molecular weight 2400) into the reaction kettle, and heat up to 65°C. After the isobutenyl polyoxyethylene ether melts into a liquid state, heat it to 70°C, and put 1.09g of benzyl peroxide into the kettle. After dissolving, add dropwise a mixture of acrylic acid and mercaptopropionic acid to the reaction kettle within 3h. The acrylic acid is 12.96g and the mercaptopropionic acid is 0.31g. After the addition is complete, add 0.5 benzoyl peroxide. g, the reaction is over after 3h incubation. The reaction product was introduced into a microtome. The working temperature of the microtome was 70℃. After slicing, the polycarboxylate water-reducing agent flakes with a thickness of 1mm were obtained, and then the polycarboxylate water-reducing agent flakes were processed at -5℃ using an ultrafine mill. It is crushed to obtain a powdery polycarboxylic acid water reducing agent with a particle size of less th...

Example Embodiment

[0064] Embodiment two:

[0065] After storing the powdery polycarboxylic acid water-reducing agent obtained in Example 1 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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