Starch adhesive for rosin tackifying

A technology of starch adhesive and rosin, which is applied in the direction of starch adhesive, adhesive type, polymer adhesive additive, etc., can solve the problems of cost increase, corrugated paper easy to absorb moisture, strength decline, etc., and achieve good weather resistance and Persistence, easy synthesis method, effect of reducing hygroscopicity

Inactive Publication Date: 2018-05-11
王葱芽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above operations, whether it is starch amorphization or neutralization treatment, a large amount of water-soluble salts will inevitably be introduced. When the starch adhesive containing these salts is applied to corrugated paper, the finished product will have undesired hygroscopicity,

Method used

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  • Starch adhesive for rosin tackifying
  • Starch adhesive for rosin tackifying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a 2L reaction kettle with an ultrasonic stirring probe and a heat exchange tube, put 20g of cornstarch, 6g of hydrogenated rosin and 10g of methylene chloride, turn on the ultrasound, and perform ultrasonic treatment for 20min at a power of 400W to fully disperse the material. Then feed water at 0°C into the heat exchange tube, lower the temperature of the reaction material to 2°C, and then put 4.5g of DCC and 0.2g of DMPA into the reactor, and ultrasonically react at this temperature for 1.5h; then stop the supply of cooling water , continue the ultrasonic reaction, gradually warm the system to room temperature, and maintain this temperature, continue to react for 15h. Then, 1 g of glycerin and 70 g of water were put into the reactor for 5 times, and ultrasonically dispersed for 20 min to obtain a starch adhesive thickened by rosin.

Embodiment 2

[0033] Put 150g of sweet potato starch, 8g of rosin and 8g of dichloromethane into a 2L reactor with an ultrasonic stirring probe and a heat exchange tube, turn on the ultrasound, and perform ultrasonic treatment for 28min at a power of 400W to fully disperse the material. Then feed water at 0°C to the heat exchange tube, reduce the temperature of the reaction material to 2°C, then put 6g DIC and 0.25g DMPA into the reactor, and perform ultrasonic reaction at this temperature for 2 hours; then stop the supply of cooling water and continue Ultrasonic reaction, the system was gradually warmed to room temperature, and maintained at this temperature, continued to react for 16h. Then, 0.8 g of ethylene glycol and 80 g of water were put into the reactor for 5 times, and ultrasonically dispersed for 20 min to obtain a starch adhesive thickened by rosin.

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Abstract

The invention belongs to the field of adhesives and particularly relates to a starch adhesive for rosin tackifying. The starch adhesive for rosin tackifying is prepared from raw materials in parts byweight as follows: 10-20 parts of starch, 5-8 parts of rosin or rosin derivatives, 0.5-1 part of a plasticizer, 3.5-9.5 parts of an esterification catalyst, 0.1-0.5 parts of an esterification catalytic promoter, 5-10 parts of an organic dispersing agent and 60-80 parts of water, wherein the esterification catalyst is selected from DCC (dicyclohexylcarbodiimide) or DIC (N,N'-diisopropylcarbodiimide), and the esterification catalytic promoter is DMAP (4-dimethylaminopyridine). The starch adhesive for rosin tackifying is one natural and degradable adhesive and meets environmental protection requirements. The adhesive has improved adhesiveness, the tackifier rosin is covalently bonded with the main chain of starch and cannot transfer, and an adhesive layer has good weather fastness and durability. The invention further provides a simple adhesive synthesis method. Operation of introducing water soluble salt is avoided, and moisture absorption of the adhesive is reduced.

Description

technical field [0001] The invention belongs to the field of adhesives, in particular to starch adhesives thickened by rosin. Background technique [0002] With the development of the express delivery business, the consumption of corrugated paper has also risen sharply due to the demand for commodity packaging. [0003] Considering the increasingly stringent environmental protection ban and the increase in production costs, starch adhesives are increasingly used in corrugated paper production. Compared with high-cost polyurethane adhesives and non-degradable EVA white latex, starch adhesives have many advantages such as sufficient bond strength, simple preparation process, wide source of raw materials, and natural degradation. However, the so-called bond strength can still meet the requirements, only for the lowest standard, to ensure that the corrugated paper will not be scrapped due to glue opening in a short period of time. In order to improve the bonding performance of...

Claims

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Application Information

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IPC IPC(8): C09J103/02C09J11/08
CPCC09J103/02C08L2205/05C09J11/08C08L93/04
Inventor 王葱芽
Owner 王葱芽
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