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

AI Technical Summary

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

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

Examples

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Example Embodiment

[0022] The invention provides a method for preparing a star-shaped polycarboxylic acid water reducing agent, which comprises the following steps:

[0023] The double bond-containing monomer, nucleating agent and water are mixed to obtain a monomer-nucleating agent mixed solution. The nucleating agent includes pentaerythritol tris(3-mercaptopropionic acid) ester, triethanolamine tris(3-mercaptopropane) One of acid) ester, glucose tetrakis (3-mercaptopropionic acid) ester and ethylenediamine tetrakis (2-mercaptoethyl acetate);

[0024] Provide initiator aqueous solution;

[0025] Provide an aqueous solution of polyoxyethylene ether with double-end bonds;

[0026] The monomer-nucleating agent mixed solution and the initiator aqueous solution are simultaneously dropped into the double-terminated polyoxyethylene ether aqueous solution to perform polymerization reaction to obtain a star-shaped polycarboxylic acid water reducing agent.

[0027] In the present invention, a monomer containing a...

Example Embodiment

[0046] Example 1

[0047] In a drip tank with stirring and metering, add 135 kg of acrylic acid, 7.5 kg of pentaerythritol tris(3-mercaptopropionic acid) ester and 332.5 kg of water to obtain a monomer-nucleating agent mixed solution, which is stirred and dissolved for use.

[0048] In another dripping tank with stirring and metering, add 7.5 kg of ammonium persulfate and 242.5 kg of water to obtain an aqueous initiator solution, which is stirred and dissolved and heated to 50° C. for later use.

[0049] Add 1500kg of prenol polyoxyethylene ether (n=20) and 3500kg of water into the reaction kettle, turn on the stirring, and heat to 50°C. After the temperature of the bottom of the kettle is accurately controlled, 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. After the dropping is completed, heat to 50°C for 1 hour to obtain star polycarboxylic acid reduction The water agent is th...

Example Embodiment

[0051] Example 2

[0052] Add 225kg maleic anhydride, 30kg glucose tetrakis (3-mercaptopropionic acid) ester and 280kg water in a dripping tank with stirring and metering to obtain a monomer-nucleating agent mixed solution, stir and dissolve and heat to 75 ℃ for use.

[0053] In another dripping tank with stirring and metering, add 30 kg of sodium persulfate and 120 kg of water to obtain an aqueous initiator solution, which is stirred and dissolved and heated to 75° C. for later use.

[0054] Add 1500 kg of methallyl alcohol polyoxyethylene ether (n=75) and 2282 kg of water into the reaction kettle, turn on the stirring, and heat to 75°C. After the bottom temperature of the kettle is accurately controlled, the monomer-nucleating agent mixed solution and the initiator aqueous solution are added dropwise at the same time, and the dropping rate is controlled to 3kg / min. After the dropping is completed, it is heated to 90°C and reacted for 5 hours to obtain the star polycarboxylic acid ...

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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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