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Preparation method of modified sodium alginate/polyacrylic acid composite thickener

A composite thickener, sodium alginate technology, applied in dyeing, textiles and papermaking, etc., can solve the problems of poor rheology of sodium alginate, poor rheology of sodium alginate original paste, low Newtonian viscosity and low structural viscosity, etc. , to achieve the effect of improving thickening performance and electrolyte resistance

Active Publication Date: 2020-06-19
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because there are a large number of carboxyl groups with strong hydration in the macromolecule of sodium alginate, the sodium alginate paste has a high Newtonian viscosity and a low structural viscosity, so that the rheological properties of the original paste of sodium alginate are poor
Some researchers compound sodium alginate with polyacrylic acid synthetic thickener to improve the shortcomings of synthetic pastes that are not resistant to electrolytes and poor rheological properties of sodium alginate
However, sodium alginate is chemically modified and used in the polymerization process of acrylic acid monomers to prepare modified sodium alginate / polyacrylic acid composite thickeners. So far, there are few reports

Method used

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  • Preparation method of modified sodium alginate/polyacrylic acid composite thickener

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Add sodium alginate to a three-neck flask equipped with a stirrer, reflux device, and dropping funnel, and then add an appropriate amount of deionized water. The mass ratio of deionized water to sodium alginate is 30:1, so that the alginic acid The sodium is completely dissolved; adjust the pH to 8 with a 50% mass fraction of sodium hydroxide solution, slowly add allyl glycidyl ether, the mass ratio of allyl alcohol glycidyl ether to sodium alginate is 0.8:1, and heat in a water bath to 70°C, react for 10h, after the reaction is over, cool to room temperature, adjust the pH of the solution to 4 with glacial acetic acid with a mass fraction of 50%, add acetone and let it stand for 12h, remove the water and unreacted allyl glycidyl ether in the mixture, After the product is precipitated, filter, then stand still with acetone for 12 hours, filter, collect the solid, vacuum dry at 50°C for 24 hours, and set aside;

[0024] (2) Add acrylic acid, modified sodium alginate ...

Embodiment 2

[0034] (1) Add sodium alginate to a three-neck flask equipped with a stirrer, reflux device, and dropping funnel, and then add an appropriate amount of deionized water. The mass ratio of deionized water to sodium alginate is 50:1, so that alginic acid The sodium is completely dissolved; adjust the pH to 10 with a 50% mass fraction of sodium hydroxide solution, slowly add allyl glycidyl ether, the mass ratio of allyl alcohol glycidyl ether to sodium alginate is 1.2:1, and heat in a water bath to 80°C, react for 7 hours, after the reaction, cool to room temperature, adjust the pH of the solution to 5 with glacial acetic acid with a mass fraction of 50%, add acetone and let stand for 12 hours, remove the water and unreacted allyl glycidyl ether in the mixture, After the product is precipitated, filter, then stand still with acetone for 12 hours, filter, collect the solid, vacuum dry at 70°C for 12 hours, and set aside;

[0035] (2) Add methacrylic acid, modified sodium alginate a...

Embodiment 3

[0038] (1) Add sodium alginate to a three-necked flask equipped with a stirrer, reflux device, and dropping funnel, and then add an appropriate amount of deionized water. The mass ratio of deionized water to sodium alginate is 40:1, so that alginic acid The sodium is completely dissolved; adjust the pH to 9 with a 50% mass fraction of sodium hydroxide solution, slowly add allyl glycidyl ether, the mass ratio of allyl alcohol glycidyl ether to sodium alginate is 1:1, and heat in a water bath to React at 75°C for 8 hours. After the reaction, cool to room temperature, adjust the pH of the solution to 4.5 with glacial acetic acid with a mass fraction of 50%, add acetone and let stand for 12 hours, remove the water and unreacted allyl glycidyl ether in the mixture, After the product is precipitated, filter, then stand still with acetone for 12 hours, filter, collect the solid, vacuum dry at 60°C for 18 hours, and set aside;

[0039] (2) Add acrylic acid, modified sodium alginate an...

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Abstract

The invention discloses a preparation method of a modified sodium alginate / polyacrylic acid composite thickener. The preparation method comprises the following steps: modifying sodium alginate macromolecular chains by allyl alcohol glycidyl ether by utilizing the reaction activity of hydroxyl and carboxyl on the macromolecular chains of sodium alginate, and introducing double bonds on the macromolecular chains of sodium alginate; and then adding the modified sodium alginate in the process of preparing the polyacrylic acid thickener through inverse emulsion polymerization, and selecting 4-methacryloyloxyethyltrimellitic anhydride as a functional monomer to be copolymerized with an acrylic acid monomer so as to obtain the modified sodium alginate / polyacrylic acid composite thickener with excellent performance.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a preparation method of a modified sodium alginate / polyacrylic acid compound thickener. Background technique [0002] Polyacrylic acid synthetic thickener is a kind of polymer compound obtained by copolymerizing acrylic acid and methacrylic acid as main monomers with acrylamide, acrylate and other monomers. In order to improve the performance of the thickener, N,N'-methylene bisacrylamide, diallyl phthalate, etc. are also used as crosslinking monomers during the polymerization process to introduce mild crosslinking. This kind of synthetic thickener has high paste rate and good stability, and has become the main variety of textile printing thickeners. However, the poor electrolyte resistance of traditional polyacrylic thickeners also limits their application in reactive dye printing. [0003] Sodium alginate is a polyanionic electrolyte with a high charge content, which...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F220/32C08F2/32D06P1/52
CPCC08F251/00C08F2/32D06P1/5257C08F220/06C08F220/32
Inventor 彭勇刚黎珊汪媛纪俊玲陶永新
Owner CHANGZHOU UNIV
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