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Preparation method of star-shaped polycarboxylate water reducer

A technology of polycarboxylate and water reducer, which is applied in the field of preparation of star-shaped polycarboxylate water reducer, can solve the problems of easy formation of cross-linked polymers, high price, difficult preparation of initiators, etc., and achieves simple process and solution Difficult to prepare

Active Publication Date: 2017-03-22
GUIZHOU DR SHI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a preparation method of a star-shaped polycarboxylate superplasticizer, which can increase the yield of the star-shaped structure. At the same time, the preparation method of the present invention has a simple process, is suitable for industrial production, and solves the existing problems. In the technical preparation of star-shaped polycarboxylate superplasticizers, there are problems such as difficult preparation of initiators, high price, easy formation of cross-linked polymers, and uncontrollable reactions

Method used

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  • Preparation method of star-shaped polycarboxylate water reducer
  • Preparation method of star-shaped polycarboxylate water reducer
  • Preparation method of star-shaped polycarboxylate water reducer

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preparation example Construction

[0022] The present invention provides a kind of preparation method of star polycarboxylate superplasticizer, comprises the following steps:

[0023] A monomer containing a double bond, a nucleating agent and water are mixed to obtain a monomer-nucleating agent mixed solution, and the nucleating agent includes pentaerythritol tris (3-mercapto propionate) Acid) ester, glucose tetrakis(3-mercaptopropionate) and ethylenediamine tetrakis(2-mercaptoethyl acetate);

[0024] providing an aqueous initiator solution;

[0025] Provide terminal double bond polyoxyethylene ether aqueous solution;

[0026] Adding the monomer-nucleating agent mixed solution and the initiator aqueous solution dropwise into the double bond-terminated polyoxyethylene ether aqueous solution at the same time to perform a polymerization reaction to obtain a star-shaped polycarboxylate water reducer.

[0027] The invention mixes the monomer containing double bonds, the nucleating agent and water to obtain the mon...

Embodiment 1

[0047] Add 135kg of acrylic acid, 7.5kg of pentaerythritol tris(3-mercaptopropionate) and 332.5kg of water into a drop tank with stirring and metering to obtain a monomer-nucleating agent mixed solution, stir and dissolve for later use.

[0048] In another drop tank with stirring and measuring meter, add 7.5 kg of ammonium persulfate and 242.5 kg of water to obtain an aqueous initiator solution, stir and dissolve and heat to 50° C. for later use.

[0049] Add 1,500 kg of prenol polyoxyethylene ether (n=20) and 3,500 kg of water into the reaction kettle, start stirring, and heat to 50°C. After the temperature at the bottom of the kettle is controlled accurately, add the monomer-nucleating agent mixed solution and the initiator aqueous solution dropwise at the same time, and control the dropping rate to 3kg / min. water agent, and then cooled to room temperature at a rate of 0.33°C / min for 1.5h to obtain a star-shaped polycarboxylate superplasticizer.

[0050] Dry the prepared st...

Embodiment 2

[0052] In a drop tank with stirring and metering, add 225kg of maleic anhydride, 30kg of glucose tetrakis(3-mercaptopropionate) and 280kg of water to obtain a monomer-nucleating agent mixed solution, stir and dissolve and heat to 75 ℃ for later use.

[0053] In another dropping tank equipped with a stirring and measuring meter, add 30 kg of sodium persulfate and 120 kg of water to obtain an aqueous solution of the initiator, stir and dissolve and heat to 75° C. for later use.

[0054] Add 1,500 kg of methallyl alcohol polyoxyethylene ether (n=75) and 2,282 kg of water into the reaction kettle, start stirring, and heat to 75°C. After the temperature at the bottom of the kettle is controlled accurately, add the monomer-nucleating agent mixed solution and the initiator aqueous solution dropwise at the same time, and control the dropping rate to 3kg / min. Water agent, then lower the temperature at a rate of 0.5°C / min, and cool to room temperature for 1.5h to obtain a star-shaped p...

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Abstract

The invention provides a preparation method of a star-shaped polycarboxylate water reducer and belongs to the technical field of polycarboxylate water reducers for concrete. According to the star-shaped polycarboxylate water reducer, double-bond monomers, a multi-perssad nucleating agent, an initiating agent and end double-bond polyoxylethylene ether are used as raw materials and subjected to a polymeric reaction to obtain the star-shaped polycarboxylate water reducer. According to the technical scheme provided by the invention, pentaerythritol tris(3-mercaptopropionic acid)ester, triethanolamine tris(3-mercaptopropionic acid)ester, glucose tetra(3-mercaptopropionic acid)ester and ethylene diamine(3-mercaptopropionic acid)ester serve as the nucleating agent, and the star-shaped polycarboxylate water reducer is prepared and obtained. The yield of a star-shaped structure can be increased. Meanwhile, the preparation method is simple in process and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer for concrete, in particular to a preparation method of a star-shaped polycarboxylate water reducer. Background technique [0002] Due to the large degree of freedom in molecular structure, polycarboxylate superplasticizer can be designed according to the required performance to form a variety of special polycarboxylate products, which can better meet the new requirements of concrete, so it is different from traditional Compared with water reducing agent, it has strong vitality. The polycarboxylate superplasticizer with a star molecular structure brings infinite vitality to the polycarboxylate superplasticizer, and opens a door for the improvement of the performance of the polycarboxylate superplasticizer. Practice has proved that the star polycarboxylate superplasticizer Compared with the comb structure, the molecule has a higher water reduction rate, better slump retention ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/06C04B24/26C04B103/30
CPCC04B24/2605C04B24/267C04B2103/0059C04B2103/302C08F283/065C08F220/06C08F222/06
Inventor 陈杰皮永奇方世昌杨国武田应兵
Owner GUIZHOU DR SHI TECH
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