Cation polyacrylamide solution and application thereof as surface sizing assistant

A technology of polyacrylamide and acrylamide, which is applied in the direction of water-repellent addition, coating, paper coating, etc., can solve the problems of loss of reactivity, slow AKD sizing speed, and decrease of AKD utilization rate, so as to improve the utilization of energy The effect of improving the rate, improving the tensile index and shortening the molding time

Active Publication Date: 2011-05-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there have always been two major defects in the sizing process of AKD: (1) AKD is easy to degrade when exposed to water, thus losing its reactivity, which reduces the actual utilization rate of AKD; (2) AKD sizing speed is slow and the curing time is long, usually It takes 24 hours to achieve the water resistance effect, which seriously affects the speed of the paper machine and the utilization rate of the equipment
However, there are few studies on the combination of active polymers with active groups and AKD

Method used

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  • Cation polyacrylamide solution and application thereof as surface sizing assistant
  • Cation polyacrylamide solution and application thereof as surface sizing assistant
  • Cation polyacrylamide solution and application thereof as surface sizing assistant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare cationic polyacrylamide solution:

[0046] Raw material: 6.0g of acrylamide (98% purity, 0.0845mol), 2.27g of methacryloyloxyethyltrimethylammonium chloride (77.11% of solid content, 0.00845mol), 0.48g of hydroxyethyl methacrylate (0.0037mol), deionized water 150ml, absolute ethanol 5ml.

[0047] Steps: 6.0g of acrylamide (purity: 98%, 0.0845mol), 2.27g of methacryloxyethyltrimethylammonium chloride (solid content: 77.11%, 0.00845mol), 0.44% of hydroxyethyl methacrylate g (0.0037mol), be dissolved in the mixed solvent of 150mL deionized water and 5ml dehydrated ethanol, under nitrogen protection, stir at 30 ℃ temperature to obtain mixed solution, then stir 0.16g initiator (0.05g bisulfite Sodium, 0.11g ammonium persulfate) was added dropwise in the mixed solution, and after the dripping was completed, the reaction was incubated for 8 hours, and then cooled under stirring to obtain 160 g of cationic polyacrylamide solution, wherein the content of cationic polyac...

Embodiment 2

[0063] Raw materials: 6.0g of acrylamide (purity: 98%, 0.0845mol), 2.27g of methacryloxyethyltrimethylammonium chloride (solid content: 77.11%, 0.00845mol), 0.53g of hydroxypropyl methacrylate (0.0037mol), deionized water 150ml, absolute ethanol 5ml.

[0064] Steps: 6.0 g of acrylamide (purity 98%, 0.0845 mol), 2.27 g of methacryloxyethyltrimethylammonium chloride (solid content of 77.11%, 0.00845 mol), 0.53 hydroxypropyl methacrylate (0.0037mol), be dissolved in the mixed solvent of 150mL deionized water and 5ml dehydrated ethanol, under nitrogen protection, stir at 30 ℃ of temperature to obtain mixed solution, then stir with 0.16g initiator (0.05g sodium bisulfite , 0.11g ammonium persulfate) was added dropwise in the mixed solution, and after the drop was completed, it was incubated for 8 hours and then cooled under stirring to obtain 160 g of cationic polyacrylamide solution, wherein the content of cationic polyacrylamide was 5.1%.

[0065] Preparation of surface sizing a...

Embodiment 3

[0071] Raw materials: acrylamide 6.0g (purity 98%, 0.0845mol), methacryloxyethyltrimethylammonium chloride 4.00g (solid content 77.11%, 0.0193mol), 1,6-hexanediol Acrylate 0.30g (0.00133mol), deionized water 150ml, absolute ethanol 10ml.

[0072] Steps: 6.0g of acrylamide (purity: 98%, 0.0845mol), 4.00g of methacryloyloxyethyltrimethylammonium chloride (solid content: 77.11%, 0.0193mol), 1,6-hexanediol Diacrylate 0.30 (0.00133mol), dissolved in a mixed solvent of 150mL deionized water and 10ml absolute ethanol, under nitrogen protection, stirred at a temperature of 70°C to obtain a mixed solution, and then stirred 0.09g initiator (0.015g Sodium bisulfite, 0.075g of ammonium persulfate) was added dropwise in the mixed solution, and after the drop was completed, it was incubated for 2 hours and then cooled under stirring to obtain 168g of cationic polyacrylamide solution, wherein the content of cationic polyacrylamide was 5.6%. .

[0073] Preparation of surface sizing agent: a...

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Abstract

The invention discloses a cation polyacrylamide solution which is prepared by the following steps: dissolving acrylamide, a cation monomer, a polyfunctional group monomer in a compound solvent; under the protection of nitrogen, stirring at the temperature of 30-70 DEG C to obtain a mixed solution; while stirring, dropwise adding an initiator into the mixed solution; reacting at constant temperature for 2-8 hours; and then, cooling while stirring, thereby obtaining the cation polyacrylamide solution. The cation polyacrylamide solution provided by the invention can be used as a surface sizing assistant for preparing a surface sizing agent together with AKD (Alkyl Ketene Dimer). The cation polyacrylamide solution can effectively improve the tensile index of corrugated paper, accelerates the curing of the AKD, shortens the forming time of paper, increases the utilization ratio of equipment, and solves the problem of high energy consumption caused by long curing time in the AKD modification process.

Description

1. Technical field [0001] The invention relates to a cationic polyacrylamide solution and a preparation method thereof, in particular to the use of the cationic polyacrylamide solution as a surface sizing aid. 2. Background technology [0002] In recent years, in order to reduce costs in the production of corrugated paper, more non-wood pulp and waste paper have been used, resulting in an increase in short fiber content in corrugated paper and a decrease in paper strength. In order to ensure the quality of paper while obtaining economic benefits, surface sizing has become the main method of corrugated paper modification. Through surface sizing, two sizing films can be formed on the surface of the paper, which can effectively improve the strength of the paper, especially the water resistance of the paper. [0003] In the water resistance of corrugated paper, the most widely used sizing agents are alkyl ketene dimer (AKD) and alkenyl succinic anhydride (ASA). Because the siz...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F220/28C08F222/14C08F222/20D21H21/16D21H19/20
Inventor 盛伟明王德海蔡万泼
Owner ZHEJIANG UNIV OF TECH
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