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Preparation method of polymeric dispersant for papermaking

A technology of dispersant and regulator, applied in fiber dispersant addition, paper, etc., can solve the problems of large dosage of alcohol, long production cycle and high cost

Inactive Publication Date: 2012-07-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, alcohol compounds are often used as chain transfer agents in the synthesis method of low-molecular-weight sodium polyacrylate, but this method requires a very large dose of alcohols, and after the reaction, in order to save and purify, it is necessary to distill and recover chains. transfer agent, resulting in complex preparation process, long production cycle, high energy consumption and high cost

Method used

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  • Preparation method of polymeric dispersant for papermaking
  • Preparation method of polymeric dispersant for papermaking
  • Preparation method of polymeric dispersant for papermaking

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preparation example Construction

[0021] The invention discloses a preparation method of a dispersant for papermaking, comprising the following steps:

[0022] Add acrylic acid and ammonium persulfate solution dropwise to the sodium bisulfite solution at 65-90 °C, respectively, and obtain a mixed solution after heat preservation;

[0023] Hydroquinone is added to the mixed solution, cooled to 40-50° C., and the pH value is adjusted to 7-8 with a pH value adjuster to obtain a dispersant for papermaking.

[0024] In the preparation process of the above-mentioned dispersant for papermaking, the present invention uses acrylic acid as a polymerization monomer, sodium bisulfite as a chain transfer agent, hydroquinone as a polymerization inhibitor, and ammonium persulfate as an initiator, and then uses pH value adjustment A low molecular weight sodium polyacrylate dispersant is obtained by adjusting the pH value of the agent. Sodium bisulfite first reacts with ammonium persulfate to generate free radicals, and then ...

Embodiment 1

[0048] Take a four-necked flask and place it in a water bath. In the four-necked flask, place two separatory funnels in two ports, a thermometer in one port to control the temperature, and a stirrer in the other port for stirring the liquid.

[0049] Dissolve 16.5g of ammonium persulfate in 100g of water to obtain an ammonium persulfate solution, and continue to put the ammonium persulfate solution and 270g of acrylic acid into two separatory funnels of the four-necked flask respectively;

[0050] Dissolve 12.5g of sodium bisulfite in 245g of water and add it to the bottom of the four-necked flask;

[0051] Adjust the temperature of the water bath to 80°C, turn on the stirrer and start stirring. When the temperature rises to 65°C, start to add acrylic acid and ammonium persulfate solution dropwise at the same time, and ensure that both dropwise addition ends at the same time. The dropwise addition time is about 2 hours. After the dropwise addition, the temperature was kept at ...

Embodiment 2

[0055] Take a four-necked flask and place it in a water bath, two separatory funnels are placed in two ports of the four-necked flask, a thermometer is placed in one port to control the temperature, and a stirrer is placed in the other port for stirring the liquid;

[0056] 16.5g of ammonium persulfate was dissolved in 100g of water to obtain an ammonium persulfate solution, and the ammonium persulfate solution and 280g of acrylic acid were continuously put into two separatory funnels of the four-necked flask respectively;

[0057] Dissolve 16.5g of sodium bisulfite in 231g of water and add it to the bottom of the four-necked flask;

[0058] Adjust the temperature of the water bath to 80°C, turn on the stirrer and start stirring. When the temperature rises to 65°C, start to add acrylic acid and ammonium persulfate solution dropwise at the same time, and ensure that both dropwise addition ends at the same time. The dropwise addition time is about 2 hours. After the dropwise add...

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Abstract

The invention discloses a preparation method of a polymeric dispersant for papermaking. In the preparation method, sodium hydrogen sulfite is used as a chain transfer agent and a reducing agent; in the initial stage of the reaction, with dropwise addition of ammonium persulfate, the sodium hydrogen sulfite and the ammonium persulfate simultaneously take effects to initiate free radical addition polymerization; and with great consumption of the ammonium persulfate, the concentration of the sodium hydrogen sulfite is gradually increased in solution, excessive hydrogen atoms are released and the sodium hydrogen sulfite is used as the chain transfer agent to stop increase of the molecular weight. Furthermore, in the preparation method, hydroquinone is used as an inhibitor, residual unreacted free radicals in the reaction are removed, polymer segments which are the reaction products are ensured not to be subjected to addition polymerization, the molecular weight is kept in the range of 1,000 to 2,000, and the stability of the product performance is ensured. Therefore, the preparation method of the polymeric dispersant for papermaking, which is provided by the invention, has simple process, alcohol compound is avoided being used as the chain transfer agent, and the molecular weight of the prepared dispersant for papermaking is in the range of 1,000 to 2,000 and has narrow distribution.

Description

Technical field [0001] The present invention relates to the technical field of surfactants, and more specifically, to a method for preparing a dispersant for papermaking. Background technique [0002] Polymer surfactant is an important surfactant. Because polymer surfactant has the characteristics of adjustable molecular weight and can adapt to the needs of different fields, it has been widely used. As a polymer surfactant, sodium polyacrylate can be used as a dispersant, thickener or flocculant depending on its molecular weight. The main function of the dispersant is to adsorb on the surface of the dispersed object and reduce the surface free energy of the dispersed object to achieve the purpose of dispersion. Since sodium polyacrylate with a molecular weight of 500 to 5000 has good dispersing effect, it is used as a dispersant for papermaking. [0003] At present, the preparation method of sodium polyacrylate has been widely reported. For example, the Chinese patent docu...

Claims

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Application Information

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IPC IPC(8): D21H21/08C08F20/06C08F2/38
Inventor 庄婷婷张永利于力温诗渺白福臣
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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