Acrylic acid-maleic anhydride copolymer pigment dispersing agent and preparation method thereof

A technology of pigment dispersant and maleic anhydride, applied in the direction of coating, etc., can solve the problems of weak dispersion stability and poor dispersion effect, and achieve the effects of good stability, uniform dispersion and cost reduction

Inactive Publication Date: 2019-02-15
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic small molecule dispersants mainly refer to various surfactants, which are sensitive to ions, pH value, temperature and other factors in the dispersion system, have weak dispersion stability and poor dispersion effect

Method used

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  • Acrylic acid-maleic anhydride copolymer pigment dispersing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A pigment dispersant made of acrylic acid, maleic anhydride, catalyst, initiator and sodium hydroxide. The monomer acrylic acid is 30 parts, the ratio of maleic anhydride is 15 parts, the initiator is 2 parts of sodium persulfate, 1 part of hydrogen peroxide, and the amount of the catalyst ferrous sulfate is 25 ppm of the total monomer mass.

[0014] A certain amount of acrylic acid and maleic anhydride are dissolved in water and prepared into a 20% solution for later use. Add a certain amount of water to the reactor, add the catalyst ferrous sulfate, the addition amount is 25 ppm of the total monomer mass, start the stirrer, stir at 30 rpm for 5 minutes; at the same time increase the temperature of the reactor to 80°C. Add the prepared mixed solution of acrylic acid and maleic anhydride dropwise to the reaction kettle, control the dropping rate, and complete the dropwise addition within 3 hours. At the same time, sodium persulfate and hydrogen peroxide solution initiator...

Embodiment 2

[0017] A pigment dispersant made of acrylic acid, maleic anhydride, catalyst, initiator and sodium hydroxide. The monomer acrylic acid is 45 parts, the ratio of maleic anhydride is 9 parts, the initiator is 5 parts of sodium persulfate, 2 parts of hydrogen peroxide, and the amount of the catalyst ferrous sulfate is 90 ppm of the total monomer mass.

[0018] A certain amount of acrylic acid and maleic anhydride are dissolved in water and prepared into a 30% solution for later use. Add a certain amount of water to the reactor, add the catalyst ferrous sulfate, the addition amount is 90 ppm of the total monomer mass, start the stirrer, stir at 40 rpm for 7 minutes; at the same time increase the temperature of the reactor to 92°C. Add the prepared mixed solution of acrylic acid and maleic anhydride dropwise to the reaction kettle, control the dropping rate, and complete the dropwise addition within 4 hours. At the same time, sodium persulfate and hydrogen peroxide solution initiator...

experiment example

[0020] Select sodium polypropylene dispersant commonly used in paper mills as 1 # Sample, take the dispersant prepared in this application as 2 # And 3 # For the sample, the same pigment dispersion method was used to carry out the dispersion experiment of the porcelain clay pigment, and the amount of dispersant was 0.08% of the total mass of the porcelain clay. The specific test data are as follows:

[0021] Table 1 compares the dispersion effect of different dispersants:

[0022] Table 1

[0023]

[0024] It can be drawn from the table that the dispersing effect of the dispersant in this application is better than that of the commonly used commercially available sodium polyacrylate dispersant.

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Abstract

The invention provides an acrylic acid-maleic anhydride copolymer pigment dispersing agent and a preparation method thereof. The pigment dispersing agent is prepared from acrylic acid, maleic anhydride, a catalyst, an initiator, sodium hydroxide and other auxiliaries, wherein 30-50 parts of acrylic acid monomers and 10-20 parts of maleic anhydride are included, the initiator is prepared from 2-5 parts of sodium persulfate and 1-2 parts of hydrogen peroxide, and the catalyst ferrous sulfate accounts for 25-100 ppm of the total mass of monomers. According to the preparation method, maleic anhydride and an acrylic acid solution are mixed with a parallel dripping-solution polymerization method, then the mixed solution and the initiator are added dropwise to a reactor, and an acrylic acid-maleic anhydride copolymer is synthesized. By copolymerization of the monomers and acrylic acid, synthesis steps are simplified, polymer molecular weight is controlled, higher monomer conversion rate is guaranteed, and the copolymer dispersing agent with uniform structure is synthesized; the synthesized dispersing agent has good dispersing effect, good stability and small consumption, and a coating isuniformly dispersed.

Description

Technical field [0001] The invention relates to an acrylic acid-maleic anhydride copolymer pigment dispersant, in particular to an acrylic acid-maleic anhydride copolymer pigment dispersant and a production method thereof. Background technique [0002] In the paint preparation process of pigment-coated paper, the extremely small particle size and extremely high surface energy of the coated pigment particles are very easy to flocculate and form agglomerates, which affects the operability of coated paper production and the quality of coated paper. In order to achieve uniform dispersion of pigment particles such as porcelain clay and calcium carbonate, prepare coatings with good fluidity and rheology, improve the running performance of the coated paper machine, and prevent the mutual attraction between pigment particles and agglomeration, it must be added when preparing the coating Dispersant to overcome the mutual attraction between the pigment particles in the suspension. The dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F222/06C09D7/65
CPCC08F220/06C09D7/65C08F222/06
Inventor 景宜耿悦凯孟佳佳
Owner NANJING FORESTRY UNIV
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