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A kind of preparation method of star 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, uncontrollable reaction, etc., achieve simple process and solve the problem of preparation difficult effect

Active Publication Date: 2018-01-26
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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  • A kind of preparation method of star polycarboxylate water reducer
  • A kind of preparation method of star polycarboxylate water reducer
  • A kind of preparation method of star polycarboxylate water reducer

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preparation example Construction

[0022] The invention provides a preparation method of a star-shaped polycarboxylate water reducer, comprising the following steps:

[0023] Mixing the double bond-containing monomer, nucleating agent and water to obtain a monomer-nucleating agent mixed solution, wherein the nucleating agent includes pentaerythritol tris(3-mercaptopropionate), triethanolamine tris(3-mercaptopropionate) acid) ester, a kind of in glucose tetrakis (3-mercaptopropionic acid) ester and ethylenediamine tetrakis (2-mercaptoethyl acetate);

[0024] Provide an aqueous solution of initiator;

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

[0026] The monomer-nucleating agent mixed solution and the initiator aqueous solution are simultaneously added dropwise to the terminal double bond polyoxyethylene ether aqueous solution to carry out a polymerization reaction to obtain a star-shaped polycarboxylate water reducer.

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

Embodiment 1

[0047] In a dropping tank with stirring and metering, 135 kg of acrylic acid, 7.5 kg of pentaerythritol tris(3-mercaptopropionate) and 332.5 kg of water were added to obtain a monomer-nucleating agent mixed solution, which was stirred and dissolved for subsequent use.

[0048] In another dropping tank with stirring and measuring meter, 7.5 kg of ammonium persulfate and 242.5 kg of water were added to obtain an aqueous initiator solution, which was heated to 50° C. for subsequent use after stirring and dissolving.

[0049] Add 1500kg of prenol polyoxyethylene ether (n=20) and 3500kg of water to the reaction kettle, turn on stirring, and heat to 50°C. After the temperature of the bottom 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 drop rate is controlled to be 3kg / min. water agent, and then cooled to room temperature for 1.5h at a rate of 0.33°C / min to obtain a ...

Embodiment 2

[0052] In the dropping 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, which is heated to 75 g after stirring and dissolving. ℃ reserve.

[0053] In another dropping tank with a stirring and measuring meter, 30 kg of sodium persulfate and 120 kg of water were added to obtain an aqueous initiator solution, which was heated to 75° C. for subsequent use after stirring and dissolving.

[0054] Add 1500kg of methallyl alcohol polyoxyethylene ether (n=75) and 2282kg of water to the reaction kettle, turn on stirring, and heat to 75°C. After the temperature of the bottom 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 drop rate is controlled to be 3kg / min. water agent, then cool down at a rate of 0.5°C / min, and cool to room temperature ...

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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 of the molecular structure, the polycarboxylate superplasticizer can be structurally designed according to the required properties to form a variety of special polycarboxylate products, which can better meet the new requirements constantly put forward by concrete. Compared with superplasticizers, it has strong vitality. The star-shaped molecular structure of the polycarboxylate superplasticizer 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-shaped polycarboxylate superplasticizer Compared with the comb structure, the molecule has higher water reduction rate, better s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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