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Polyethyleneimine-modified AKD sizing agent and preparation method thereof

A technology of polyethyleneimine and sizing agent, which is applied in the direction of water repellent addition, etc., can solve the problems that aluminum sulfate will corrode equipment and add it, and achieve the effect of reducing the cost of copying sizing, reducing the amount of addition, and shortening the curing time

Inactive Publication Date: 2011-01-19
天津市奥东化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to improve the sizing efficiency, people generally use aluminum sulfate to increase the Zeta potential to meet the sizing effect, which plays a certain role and cannot completely overcome the above-mentioned defects.
Aluminum sulfate will corrode equipment, and at the same time add acid radical load to the huge circulating water system, creating a vicious circle in the environmental system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A polyethyleneimine modified AKD sizing agent, the AKD emulsion is modified with polyethyleneimine and a crosslinking agent, the main raw material of the modified AKD sizing agent, by weight, N-(3 chloro-2 Hydroxypropyl) N 1 N 1 N-trimethylamine chloride (CTA) 1 part, cationic starch 0.8 part, prepared emulsifier; prepared emulsifier 0.8 part, alkyl ketene dimer 1 part, polyethyleneimine 0.015, glutaraldehyde 0.005 Prepare finished AKD sizing agent in parts.

[0014] The preparation method of polyethylenimine modified AKD sizing agent, according to the following steps:

[0015] (1) The emulsifying emulsifier is synthesized by reaction in an etherification reactor, stirred and reacted at 65-90°C for 2 hours, and the ratio of N-(3 chloro-2 hydroxypropyl) N in parts by weight 1 N 1 1 part of N-trimethylammonium chloride (CTA), 0.8 part of cationic starch, the cationic emulsifier is prepared by synthesis reaction, and the pH value is adjusted to 5 with formic acid;

[...

Embodiment 2

[0019] A polyethyleneimine modified AKD sizing agent, the AKD emulsion is modified with polyethyleneimine and a crosslinking agent, the main raw material of the modified AKD sizing agent, by weight, N-(3 chloro-2 Hydroxypropyl) N 1 N 1 1 part of N-trimethylamine chloride (CTA), 1.4 parts of cationic starch, prepared emulsifier; prepared emulsifier 1.2 parts, alkyl ketene dimer 1 part, polyethyleneimine 0.03, glutaraldehyde 0.002 Prepare finished AKD sizing agent in parts.

[0020] The preparation method of polyethyleneimine modified AKD sizing agent is made according to the above-mentioned raw material ratio and the steps of Example 1.

Embodiment 3

[0022] A polyethyleneimine modified AKD sizing agent, the AKD emulsion is modified with polyethyleneimine and a crosslinking agent, the main raw material of the modified AKD sizing agent, by weight, N-(3 chloro-2 Hydroxypropyl) N 1 N 1 1 part of N trimethylamine chloride (CTA), 1 part of cationic starch, prepared emulsifier; prepared emulsifier 1 part, alkyl ketene dimer 1 part, polyethyleneimine 0.01, glutaraldehyde 0.003 Prepare finished AKD sizing agent in parts.

[0023] The preparation method of polyethyleneimine modified AKD sizing agent is made according to the above-mentioned raw material ratio and the steps of Example 1.

[0024] Principle: Polyethyleneimine is a high cationic polymer. After polyethyleneimine and AKD are cross-linked and polymerized, its molecular chain has a three-dimensional network structure, which improves high temperature resistance and shortens the curing time of paper. The unique hydrophilic and lipophilic functional groups of amines contain...

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PUM

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Abstract

The invention relates to a preparation method of a polyethyleneimine-modified AKD sizing agent. The method comprises the following steps of: stirring and reacting raw materials at the temperature of between 65 and 90 DEG C for 2 hours; preparing a cationic emulsifier from 0.8 to 1.4 weight parts of CTA cationic starch by synthesis reaction, wherein pH value is adjusted to be 5 with formic acid; heating and melting 1 weight part of AKD raw powder (alkyl ketene dimer) in a melting kettle, and stirring and melting the material at the temperature of between 65 and 85 DEG C; and placing 0.8 to 1.2weight parts of obtained emulsifier and 1 weight part of AKD raw powder into an emulsion synthesis kettle, and adding 0.015 to 0.03 weight part of polyethyleneimine, 0.002 to 0.005 weight part of glutaraldehyde and hot water into the kettle with high-shear stirring for 0.8 to 2 hours. The sizing agent and the preparation method have the advantages that: the curing time is reduced by over 80 percent compared with the conventional curing time, namely the curing time is reduced to be 4 to 8 hours from 72 hours, the application of the AKD glue to coating paper in a low weighing machine is extended, the hydrolysis phenomenon of the AKD glue is solved, and the amount of the glue applied to one ton of paper is reduced by 25 to 30 percent.

Description

technical field [0001] The invention belongs to chemical sizing agents for papermaking, in particular to a polyethyleneimine modified AKD sizing agent and a preparation method thereof. Background technique [0002] Neutral sizing agent AKD glue is the most widely used paper water-repellent agent in papermaking. AKD glue is made of alkyl ketene dimer, cationic starch and quaternary ammonium salt etherifying agent as the main raw materials. AKD glue is a fiber-reactive sizing agent. Under medium-alkaline conditions, its reactive functional groups can react with the hydroxyl groups on the fibers to form covalent bonds and fix them on the fibers, forming a stable film on the fiber surface. . The chemical structure of AKD has two characteristics: one is that two long-chain hydrophobic functional groups endow AKD glue with good hydrophobicity; Water resistant purpose. However, its lactone ring can also react with water to form a hydrolyzate without sizing effect, which will a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 田成杰李端李伯平于庆海吴连海
Owner 天津市奥东化工有限公司
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