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Preparation method for paper-making sizing agent

A sizing agent and a sizing technology are applied in the field of preparation of sizing agents for papermaking, which can solve the problems of difficulty in meeting the requirements of papermaking industry production, poor water resistance, brittle film-forming properties, and the like, and achieve a simple, easy and compatible preparation method. Good performance and low volatility

Active Publication Date: 2014-03-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when collagen is used alone, its water resistance is poor, and its film-forming property is brittle, without toughness, and easy to break, which is difficult to meet the requirements of paper industry production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Hydrolyze gelatin with trypsin to obtain collagen with a relative molecular mass of 4000-10000;

[0023] 2) Cross-linking: Dissolve the collagen obtained in step 1) in water, configure it into a collagen aqueous solution with a collagen mass concentration of 10%, add acetic acid to it to adjust the pH to 5.5, and then add 2% of the collagen mass to the collagen solution The cross-linking agent carbodiimide was dropped into the aqueous collagen solution, and reacted at 35°C for 4 hours to obtain a cross-linked collagen system;

[0024] 3) Graft modification: under the protection of nitrogen, add hydrophobic monomer acetic acid to the cross-linked collagen system obtained in step 2) at a mass ratio of hydrophobic monomer vinyl acetate to cross-linked collagen of 1:1 Vinyl ester, and then add initiator hydrogen peroxide / ferrous sulfate system to the cross-linked collagen system at a mass ratio of 3% to the hydrophobic monomer vinyl acetate, pre-initiate for 15 minutes, ...

Embodiment 2

[0026] 1) Hydrolyze gelatin with trypsin to obtain collagen with a relative molecular mass of 4000-10000;

[0027] 2) Cross-linking: Dissolve the collagen obtained in step 1) in water, prepare a collagen aqueous solution with a collagen mass concentration of 20%, adjust its pH to 7.5, and then add 3% of the collagen mass to the collagen aqueous solution The cross-linking agent genipin was added dropwise, and reacted at 40°C for 3 hours to obtain a cross-linked collagen system;

[0028] 3) Graft modification: under the protection of nitrogen, add hydrophobic monomer acrylic acid to the cross-linked collagen system obtained in step 2) at a mass ratio of butyl acrylate to cross-linked collagen of 1:2 Butyl acrylate, then add the initiator ammonium persulfate / sodium bisulfite system to the cross-linked collagen system according to the mass ratio of 4% to the hydrophobic monomer butyl acrylate, pre-initiate for 20min, and finally graft at 75°C After reacting for 3 hours, a white e...

Embodiment 3

[0030] 1) Hydrolyze gelatin with trypsin to obtain collagen with a relative molecular mass of 4000-10000;

[0031] 2) Cross-linking: Dissolve the collagen obtained in step 1) in water, and configure it into a collagen aqueous solution with a collagen mass concentration of 30%, add sodium hydroxide to it to adjust its pH to 10, and then press the amount of collagen to 5% drop the cross-linking agent epichlorohydrin into the aqueous collagen solution, and react at 55°C for 2 hours to obtain a cross-linked collagen system;

[0032] 3) Grafting modification: under the protection of nitrogen, add hydrophobic monomer styrene to the cross-linked collagen system obtained in step 2) according to the mass ratio of hydrophobic monomer styrene and cross-linked collagen of 1:3 , and then add the initiator ammonium persulfate / sodium bisulfite system to the cross-linked collagen system at a mass ratio of 5% to the hydrophobic monomer styrene, pre-initiate for 30 minutes, and finally graft at...

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PUM

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Abstract

The invention discloses a preparation method for a paper-making sizing agent, which comprises the following steps: 1) hydrolyzing gelatin to obtain collagen; 2) dissolving the collagen obtained from the step 1) in water to prepare a collagen aqueous solution with the collagen of which the mass concentration is 10-30 percent, adjusting the pH of the collagen aqueous solution to 5.0-10, dropping a cross-linking agent of which the mass is 2-10% of that of the collagen in the collagen aqueous solution, and reacting for 2-4 h at 35-55 DEG C to obtain a cross-linking collagen system; 3) adding a hydrophobic monomer in the cross-linking collagen system obtained from the step 2) under the condition that the mass ratio of the hydrophobic monomer to the collagen is 1: (1-3), adding an initiator 3-5% of the mass of the hydrophobic monomer in the cross-linking collagen system, pre-initiating for 15-30 min, and finally carrying out the grafting reaction for 2-4 h at 65-85 DEG C to obtain a white emulsion, namely the cross-linking-grafting dual modified collagen paper-making sizing agent. Biomass resource collagen is used as a raw material, and the problem of environment pollution is alleviated while the cost is lowered.

Description

【Technical field】 [0001] The invention relates to the field of papermaking chemicals, in particular to a preparation method of a papermaking sizing agent. 【Background technique】 [0002] Surface sizing can make up for the series of problems caused by the extensive use of non-wood fiber and waste paper pulp in my country's paper industry, endow paper with excellent performance, meet the current development needs of my country's paper and printing industries, and also conform to the general trend of international development. In order to better exert the surface sizing effect, it is necessary to rationally use cheap natural polymer products and synthetic polymer additives with excellent performance, to speed up the performance improvement of existing products and to develop new high-quality and low-cost products. [0003] Collagen is a natural polymer compound and one of the three major renewable resources in the world. It has excellent properties that synthetic polymers canno...

Claims

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Application Information

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IPC IPC(8): D21H21/16C08G81/00C08F283/00C08F218/08C08F220/16C08F212/08C08F220/14C08F4/40
Inventor 王学川郝晓丽任龙芳强涛涛
Owner SHAANXI UNIV OF SCI & TECH
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