Preparation method for high-strength water-resistant starch adhesive for corrugated paperboards

A technology of starch adhesive and corrugated cardboard, which is applied in the printing field, can solve the problems of continuous cutting, edge running, and high water content in the carton, and achieve the effect of shortening the drying time and improving the initial tack

Inactive Publication Date: 2014-10-29
WUXI ALONG PACKAGE PRINTING
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Problems solved by technology

It also leads to high water content in the initial stage of the carton, which often causes phenomena such as edge running, collapsing, and continuous cutting when cutting.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] High-strength water-resistant corrugated cardboard starch adhesive, its preparation method is as follows:

[0012] 1) Preparation of modified starch glue: Add a certain amount of water into the reactor, stir and add starch to make it evenly mixed, heat up to 60 ℃, then add hydrogen peroxide to react, then add sodium thiosulfate solution, after stirring, Add sodium hydroxide solution, finally add borax and PVA solution, continue to stir, cool down to below 40°C and discharge;

[0013] 2) Preparation of urea-formaldehyde resin: Add formaldehyde into the reactor with bottom water and stir, heat up to 90 ℃, adjust the pH value of the solution to about 7.5 with hexamethylenetetramine, add PVA particles, and stir well Dissolving, reacting, and then adding urea into the reactor, after reacting for a period of time, using sodium hydroxide solution to adjust the pH value to 7.0 and discharging;

[0014] 3) Compounding of modified starch glue and urea-formaldehyde resin: add the...

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PUM

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Abstract

A provided preparation method for a high-strength water-resistant starch adhesive for corrugated paperboards comprises the following steps: 1) preparation of modified starch; 2) preparation of urea-formaldehyde resin; and 3) compounding of modified starch and urea-formaldehyde resin. By adding urea-formaldehyde resin into modified starch glue, dimethylolurea and oligomers in resin and hydroxyl in starch molecules are subjected to crosslinking reaction, aldehyde group in starch and hydroxyl in resin form hemiacetal and acetal structures, and a crosslinking structure participated by starch chains is formed through reaction. Because urea-formaldehyde resin and modified starch mutual react and form a net structure, penetration of starch glue into paper is avoided, initial viscosity and water resistance of starch glue are improved, and drying time is shortened.

Description

technical field [0001] The invention relates to a preparation method of a starch adhesive for high-strength water-resistant corrugated cardboard, which belongs to the technical field of printing. Background technique [0002] Starch glue is mainly used in the manufacture of corrugated cardboard, but the water content of starch glue is as high as 60%-70%, resulting in slow drying speed. The moisture in it will permeate into the paper when it is dry, reducing the initial tack. It also leads to high water content in the initial stage of the carton, which often causes phenomena such as edge running, collapsing, and continuous cutting when cutting. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a starch adhesive for high-strength water-resistant corrugated cardboard. [0004] The preparation method of starch adhesive for high-strength water-resistant corrugated cardbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/10C09J161/24C08B31/18C08G12/12
Inventor 朱龙强
Owner WUXI ALONG PACKAGE PRINTING
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