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Preparation method and application of novel viscosity reducing rheological agent for papermaking coating

A rheological agent, a new type of technology, applied in the direction of papermaking, paper coating, textiles and papermaking, etc., can solve problems such as drop, and achieve good viscosity reduction effect and uniform molecular weight distribution

Active Publication Date: 2018-03-27
ZHEJIANG JIUBEN BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing rheological agent technology, to provide a preparation of a new type of viscosity-reducing rheological agent for papermaking coating, to improve the dispersibility of high-solid coatings, with the increase of shear rate , paint viscosity drops

Method used

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  • Preparation method and application of novel viscosity reducing rheological agent for papermaking coating
  • Preparation method and application of novel viscosity reducing rheological agent for papermaking coating
  • Preparation method and application of novel viscosity reducing rheological agent for papermaking coating

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In the four-necked flask, add 130g water, 5g maleic anhydride and 10g itaconic acid, be warming up to 60-70 ℃ stirring and dissolving, dissolve 6g 2-acrylamide-2-methylpropanesulfonic acid, 1g benzyl acrylate, 100g of acrylic acid and 20g of water are mixed and dissolved for use. At the same time, 2g of ammonium persulfate is dissolved in 16g of water to prepare an oxidizing agent solution, and 3g of sodium metabisulfite is dissolved in 30g of water to prepare a reducing agent solution. When the temperature is between 70-80°C, At the same time, add the oxidant solution, the reducing agent solution, and the mixed functional monomer dropwise to the above four-necked flask to participate in the reaction. Ethylene Glycol (M W =1000) dissolving reaction, the temperature is reacted at 80-95°C for 30-50min; the temperature is lowered to between 30-40°C, the above mixed solution is adjusted to pH value between 5.0-7.0 with liquid caustic soda 48%, and the material is discharged...

Embodiment 2

[0029] Add 120g of water, 2.5g of maleic anhydride and 5g of itaconic acid to the four-necked flask, be warming up to 60-70°C, stir and dissolve, dissolve 5g of 2-acrylamide-2-methylpropanesulfonic acid, 2g of 2-vinylpyridine , 110g of acrylic acid and 20g of water are mixed and dissolved for later use. At the same time, 2g of ammonium persulfate is dissolved in 16g of water to prepare an oxidizing agent solution, and 3g of sodium metabisulfite is dissolved in 30g of water to prepare a reducing agent solution. The temperature is between 70-80℃ , at the same time, add the oxidant solution, the reducing agent solution, and dropwise add the mixed functional monomers to the above four-necked flask to participate in the reaction, the temperature is controlled at 80-95 °C, and the reaction is added dropwise for 60-120min, and then the reaction is incubated for 20-50min; add 10g polyethylene glycol (M W =1500) dissolving reaction, the temperature is reacted at 80-95°C for 30-50min; t...

Embodiment 3

[0031] In the four-necked flask, add 130g water, 4g maleic anhydride and 8g itaconic acid, be warming up to 60-70 ℃ stirring and dissolving, dissolve 6g 2-acrylamide-2-methylpropanesulfonic acid, 3g benzyl methyl acrylate, 100g of acrylic acid and 20g of water are mixed and dissolved for later use. At the same time, 2g of ammonium persulfate is dissolved in 16g of water to prepare an oxidizing agent solution, and 2.5g of sodium metabisulfite is dissolved in 30g of water to prepare a reducing agent solution. The temperature is between 70-80℃ , at the same time, dropwise add oxidant solution, reducing agent solution, and add mixed functional monomer dropwise to the above-mentioned four-necked flask to participate in the reaction, control the temperature to 80-95 ℃, add dropwise reaction for 60-120min, and then keep warm for 20-50min; add 20g polyethylene glycol (M W =2000) dissolving reaction, the temperature is at 80-95 ℃ for 30-50min; the temperature is lowered to between 30-4...

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Abstract

The invention relates to a preparation method of a novel viscosity reducing rheological agent for a papermaking coating. The novel viscosity reducing rheological agent comprises acrylic acid, maleic anhydride, itaconic acid, 2-acrylamide-2-methyl propanesulfonic acid and functional monomer mixed liquid, wherein polyethylene glycol, water, an oxidizer, a reducer and liquid alkali 48% are also addedin the reaction. The preparation method comprises the following steps: dropwise adding the functional mixed monomer slowly into a backing material; adjusting the temperature to 70-95 DEG C; initiating copolymerization by means of an oxidizing and reducing system; carrying out a dropwise reaction for 60-120min; carrying out insulating reaction for 20-50min; then adding polyethylene glycol to reactfor about 30-50min; after reaction, reducing the temperature to be below 40 DEG C; and carrying out neutralization with liquid alkali as needed to obtain the novel viscosity reducing rheological agent. According to the preparation method provided by the invention, the production process is simple, no waste is discharged and an environment-friendly effect is achieved, the shearing viscosity can bereduced greatly in the coating application process, the dosage of a disperser is reduced, and the cost is lowered; by adopting a precise molecular weight control and main chain rigidity structural design, the viscosity of the coating is reduced, the solid content of the coating is improved, and therefore, the vehicle speed is improved and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a preparation method and application of a novel viscosity-reducing rheological agent that can be used for coated paper in the papermaking industry Background technique [0002] The modern paper industry is developing towards the large-scale and high-speed paper machines, and the coatings are also developing towards higher solid content. The solid content of some coatings has reached more than 70%, which gives the rheological agent for paper coating. The performance has put forward higher requirements, and at the same time, the research on the coating formulation of coated paper has encountered new problems. [0003] Coating is a dispersion system composed of pigment, latex and water. This system can be regarded as a multiphase system of suspension. The ideal coating should meet the process requirements of different sections such as pumping, feeding, metering, reflux and leveling. . This requires the analysis of the hydrodynam...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F220/06C08F222/06C08F222/02C08F220/58C08F220/18C08F226/06C08F4/40D21H21/06D21H19/16D21H19/14
CPCD21H19/14D21H19/16D21H21/06C08F4/40C08F220/06C08G81/025C08F222/06C08F222/02C08F220/585C08F220/1807C08F226/06
Inventor 郑保键
Owner ZHEJIANG JIUBEN BIOCHEM
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