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Preparation method of solid polycarboxylate superplasticizer

A technology of polycarboxylic acid and water reducing agent, applied in the field of polycarboxylic acid water reducing agent, can solve the problems of decreased activity frequency, hindered rearrangement of chain segments and chain segments, low production efficiency, etc., and achieves improved molecular adsorption capacity and improved Production effect and overall efficiency improvement effect

Inactive Publication Date: 2018-01-05
HUIZHOU JIANKE IND
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Problems solved by technology

If the monomer concentration in the reaction system is too high, the concentration of the entire reaction system will also increase, and the automatic acceleration of chain polymerization is difficult to control, which may hinder the rearrangement between chain segments and even terminate the polymerization reaction. Continue, resulting in poor performance of the final synthetic water reducer and the risk of gelation
With the extension of the reaction time, the viscosity of the system will continue to increase, and the frequency of activities between the reaction monomers will decrease significantly, resulting in uneven polymerization reactions and high and low product conversion rates, which have a great impact on the final performance of the product. Impact
[0004] However, the existing polycarboxylate water reducers still have the problems of low production efficiency and poor water reducing effect

Method used

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  • Preparation method of solid polycarboxylate superplasticizer
  • Preparation method of solid polycarboxylate superplasticizer
  • Preparation method of solid polycarboxylate superplasticizer

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preparation example Construction

[0021] see figure 1 , the preparation method of solid polycarboxylate water reducer in one embodiment, comprises the steps:

[0022] S110: Under the condition of preset melting temperature, heat and melt the prenol polyoxyethylene ether.

[0023] By heating and melting the prenol polyoxyethylene ether under the preset melting temperature, a colorless and transparent liquid prenyl polyoxyethylene ether can be obtained, which is convenient for subsequent mixing with other components reaction. Isopentenol polyoxyethylene ether is used as a monomer of polycarboxylate water reducer to participate in polymerization reaction.

[0024] S120: Add cobalt isooctanoate, ammonium persulfate and phosphoric acid ester to the melted isopentenol polyoxyethylene ether under the condition of preset reaction temperature, and simultaneously add acrylic acid, chrysanthemum block and ten A mixed solution of dithiol, after the reaction, a solid polycarboxylate water reducer is obtained.

[0025] ...

Embodiment 1

[0038] Put 240g (prenyl alcohol polyoxyethylene ether) TPEG into the reaction kettle, raise the temperature to 75°C-80°C, wait until the TPEG is completely melted, turn the temperature back to 65°C-70°C, add 0.36g iso Cobalt octoate, 2.1g ammonium persulfate, 25g phosphoric acid ester, stir well, add dropwise 16g of acrylic acid solution, 1.2g of dodecyl mercaptan and 0.54g of white block solution, react for 4 hours, keep warm for 1 hour, and pour it out while the reaction is over out.

Embodiment 2

[0040] Put 240g of TPEG into the reaction kettle, raise the temperature to 75°C-80°C, wait until the TPEG is completely melted, turn the temperature back to 65°C-70°C, add 0.42g of cobalt isooctanoate, 2.8g of ammonium persulfate, and 25g of phosphoric acid ester , fully stirred evenly, and at the same time, dropwise added a mixed solution of 20g of acrylic acid solution, 1.4g of dodecyl mercaptan and 0.64g of basil, reacted for 4 hours, kept it warm for 1 hour, and poured it out while the reaction was over.

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Abstract

The invention relates to a preparation method of a solid polycarboxylate superplasticizer. The preparation method comprises the following steps: heating and melting isopentenol polyoxyethylene ether at a preset melting temperature; adding cobalt isooctanoate, ammonium persulfate and phosphate ester to the molten isopentenol polyoxyethylene ether at a preset reaction temperature while dropwise adding a mixed solution of acrylic acid, sodium formaldehyde sulfoxylate and 1-dodecanethiol; reacting to obtain the solid polycarboxylate superplasticizer; cutting and grinding the solid polycarboxylatesuperplasticizer while the solid polycarboxylate superplasticizer is hot. The preparation method of the solid polycarboxylate superplasticizer adopts a double redox system, can improve the overall efficiency of polymerization reaction and further improves production effect. In addition, the phosphate ester is introduced so that phosphate groups enable the solid polycarboxylate superplasticizer tohave greatly improved molecular adsorption ability and have advantages of higher sulfate resistance, relatively good adaptability to various types of concrete and better water-reducing effect.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a preparation method of solid polycarboxylate water reducer. Background technique [0002] Although some progress has been made in the research and development of polycarboxylate superplasticizers in recent years, there are still some defects in production and application that affect the promotion and development of polycarboxylate superplasticizers. Foreign experts mainly focus on the mechanism of action of polycarboxylate high-efficiency superplasticizers, practical engineering applications, and changes in thermodynamic properties after being mixed with concrete. Domestic research started relatively late, mainly focusing on the selection of raw materials, process Optimization of conditions, reduction of production costs, etc. At present, the solid content of polycarboxylate superplasticizers produced at home and abroad is generally between 20-40%. If the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F4/40C04B24/26C04B103/30
Inventor 冯潭辉
Owner HUIZHOU JIANKE IND
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