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Coating dispersant for papermaking and preparation thereof

A technology of dispersant and raw material, which is applied in the field of coating dispersant for papermaking and its preparation, achieves the effects of simple use, less dispersant dosage and environmental protection

Inactive Publication Date: 2012-05-30
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no relevant report of using sodium hypophosphite as a chain transfer agent to obtain sodium polyacrylate as a coating dispersant for papermaking

Method used

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  • Coating dispersant for papermaking and preparation thereof
  • Coating dispersant for papermaking and preparation thereof
  • Coating dispersant for papermaking and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 4 g of sodium hypophosphite, 3 g of ammonium persulfate, 100 g of acrylic acid monomer, and 90 g of distilled water. Sodium hypophosphite and ammonium persulfate were respectively prepared with distilled water to form a sodium hypophosphite solution with a mass percent concentration of 30% and an ammonium persulfate solution with a mass percent concentration of 30%. Take 1 / 3 of the total volume of the ammonium persulfate solution and 1 / 4 of the total volume of the acrylic acid monomer, and drop them into the sodium hypophosphite solution at the same time, and then add the remaining distilled water. Heat to 65°C, adjust to keep warm, then continue to drop the remaining ammonium persulfate solution and acrylic acid monomer into the above reaction solution at the same time, and finish dropping within 1 hour. After dropping, keep warm at 65°C for 3 hours. Then, it was cooled to room temperature, and neutralized with 40% NaOH by mass percentage to make the pH of the s...

Embodiment 2

[0028] Same method as above. Sodium hypophosphite 4g, ammonium persulfate 10g, acrylic acid monomer 100g, distilled water 100g. Sodium hypophosphite and ammonium persulfate were prepared with distilled water to prepare sodium hypophosphite solution with a mass percent concentration of 25% and ammonium persulfate solution with a mass percent concentration of 25%. Take 1 / 4 of the total volume of the ammonium persulfate solution and 1 / 3 of the total volume of the acrylic acid monomer, and drop them into the sodium hypophosphite solution at the same time, and then add the remaining distilled water. Heat to 70°C, adjust to keep warm, then continue to drop the remaining ammonium sulfate solution and acrylic acid monomer into the above reaction solution, and finish dropping within 1 hour. After dropping, keep warm at 70°C for 3.5 hours. Then, it was cooled to room temperature, and neutralized with 40% NaOH by mass percentage to make the pH of the solution reach 8. Now the product ...

Embodiment 3

[0030] Same method as above, sodium hypophosphite 2g, ammonium persulfate 4g, acrylic acid monomer 100g, distilled water 100g. Sodium hypophosphite and ammonium persulfate were respectively prepared with distilled water to form a sodium hypophosphite solution with a mass percent concentration of 20% and an ammonium persulfate solution with a mass percent concentration of 20%. Take 1 / 4 of the total volume of the ammonium persulfate solution and 1 / 4 of the total volume of the acrylic acid monomer, and add them dropwise to the sodium hypophosphite solution at the same time, and then add the remaining distilled water. Heat to 65°C, adjust to keep warm, then continue to drop the remaining ammonium persulfate solution and acrylic acid monomer into the above reaction solution at the same time, and finish dropping within 1 hour. After dropping, keep warm at 70°C for 3 hours. Then, it was cooled to room temperature, and neutralized with 40% NaOH by mass percentage to make the pH of th...

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Abstract

The invention provides a coating dispersant for paper making and a preparation method thereof. The coating dispersant for paper making capable of improving or reducing viscosity of pigment dispersion is obtained by taking sodium hypophosphite as a chain transfer agent and controlling a mixing mode, mixing speed, reaction temperature and reaction time of ammonium persulfate solution and an acrylicacid monomer. The dispersant has good dispersion effect, can reduce the velocity of the dispersion with a smaller use amount in the dispersion with the same concentration, and has good water solubility and convenient use.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a coating dispersant for papermaking and a preparation method thereof. Background technique [0002] One of the main indicators of coating quality in papermaking is solid content. Pursuing higher solid content is the goal of paper coatings, and the limiting factor is the concentration of pigment dispersion. It is desirable to decrease the viscosity of the dispersion while increasing the concentration of the dispersion. However, the two are contradictory. Dispersant is one of the ways to solve the contradiction between the above two. The dispersant can disperse the dry powder or block pigment into a uniform and stable suspension under the action of force, so as to facilitate the uniform mixing with other components in the coating and prevent the dispersed pigment particles from re-flocculation due to charge factors. With the introduction of high-concentration coating machines ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/06D21H19/48D21H19/64
Inventor 颜进华陈广严许杰林陈晓明崔益智
Owner GUANGDONG IND TECHN COLLEGE