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Solvent-free two-component polyurethane cooking adhesive and preparation method thereof

A two-component polyurethane, solvent-free technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of easy delamination and low peel strength, and achieve high peel strength and cooking resistance. Good performance, the effect of improving temperature resistance and medium resistance

Inactive Publication Date: 2017-05-17
JIANGSU LIHE ADHESIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a solvent-free two-component polyurethane adhesive with high temperature resistance. By introducing polyether with bisphenol A structure and synthesizing suitable polyester polyols, the temperature resistance and medium resistance of the glue can be improved to solve the problem of ordinary non-solvent adhesives. The problem of low peel strength and easy delamination after solvent glue is cooked

Method used

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  • Solvent-free two-component polyurethane cooking adhesive and preparation method thereof
  • Solvent-free two-component polyurethane cooking adhesive and preparation method thereof
  • Solvent-free two-component polyurethane cooking adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: A kind of solvent-free two-component polyurethane cooking adhesive is made up of A glue and B glue, and wherein, A glue is to be formed by the reaction of polyester polyol, liquefied MDI and polyether polyol, and B glue is to be made of containing Composed of polyether polyol with bisphenol A structure, coupling agent and castor oil, the important ratio of glue A and glue B is 10:4~5.

[0032] In the above-mentioned solvent-free two-component polyurethane cooking glue, the polyester polyol is formed by polycondensation of a small molecular dibasic acid and a dibasic alcohol, and the small molecular dibasic acid is adipic acid, isophthalic acid Formic acid, sebacic acid, terephthalic acid, a mixture of one or two of phthalic anhydride, preferably isophthalic acid, adipic acid or sebacic acid; the dihydric alcohol is ethylene glycol , diethylene glycol, neopentyl glycol, 1,2 propanediol, methylpropanediol, glycerin, cyclohexanedimethanol, 1,4-butanediol, 1,6...

Embodiment 2

[0051] Preparation of glue A:

[0052] (1) Preparation of polyester polyol:

[0053] In a four-necked flask equipped with a thermometer, a stirrer, a spherical cooler, and a nitrogen-sealed tube, add 270 g of isophthalic acid, 172 g of diethylene glycol, 329 g of sebacic acid, 117 methyl propylene glycol, neopentyl 203g diol, and 0.2-0.25g tetrabutyl titanate catalyst, stir well, then slowly raise the temperature to 160°C, react at 160°C-230°C for 14 hours, take a sample to measure the acid value, if the acid value is less than 25mgKOH / g , then the esterification is qualified. After the esterification is qualified, the polycondensation reaction is carried out. At a temperature of 220-230°C, vacuumize at -0.1Mpa for 5 hours to obtain a polyester multi-polymer with an acid value ≤ 1mgKOH / g and a hydroxyl value of 112mgKOH / g. alcohol.

[0054] (2) Preparation of glue A:

[0055] 200g of the polyester polyol obtained after the above-mentioned esterification and polycondensation...

Embodiment 3

[0064] Preparation of glue A:

[0065] (1) Preparation of polyester polyol:

[0066] In a four-necked flask with a thermometer, a stirrer, a bulb cooler, and a nitrogen sealed tube, add 270 g of isophthalic acid, 172 g of diethylene glycol, add 118.5 g of adipic acid and 164.5 g of sebacic acid, Methylpropanediol 117, neopentyl glycol 203g, and 0.25g tetrabutyl titanate catalyst, stir evenly, then slowly raise the temperature to 160°C, react at 160°C-230°C for 14 hours, take a sample to measure the acid value, if the acid If the esterification value is less than 22mgKOH / g, the esterification is qualified. After the esterification is qualified, the polycondensation reaction is carried out. At a temperature of 220-230°C, vacuumize at -0.1Mpa for 5 hours to obtain an acid value of ≤1mgKOH / g and a hydroxyl value of 117mgKOH / g of polyester polyols.

[0067] (2) Preparation of glue A:

[0068] 200g of the polyester polyol obtained after the above-mentioned esterification and pol...

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Abstract

The invention provides a heat-resistant solvent-free two-component polyurethane cooking adhesive. Through introducing a bisphenol A structure polyether and synthesizing appropriate polyester polyol, the temperature resistance and the medium resistance of the adhesive are improved, and the problems of low peeling strength and easiness in delaminating of a common solvent-free adhesive after cooking are solved. The heat-resistant solvent-free two-component polyurethane cooking adhesive is formed by an adhesive A and an adhesive B, wherein the adhesive A is formed by polyester polyol, liquidated-MDI and polyether polyol through an reaction; the adhesive B is formed by bisphenol A structure-contained polyether polyol, a coupling agent and castor oil; the matching ratio of the adhesive A and the adhesive B is 10 to (4 to 5).

Description

[0001] Technical field: [0002] The invention relates to a solvent-free two-component polyurethane cooking glue and a preparation method thereof. [0003] Background technique: [0004] Solvent-free composite glue has been rapidly developed and applied at home and abroad due to its obvious environmental protection, safety and cost advantages. With the release of the State Council's "Action Plan for the Prevention and Control of Air Pollution" and the continuous improvement of solvent-free technology, ordinary solvent-free adhesives can no longer meet market demand, especially for boiled and retorted packaging bags. The peel strength of packaging bags made of ordinary glue will be greatly reduced after high-temperature cooking, and even delamination will occur in severe cases, which directly affects the normal use of flexible packaging products. For example, although the common flexible packaging glue currently on the market is a solvent-free two-component glue, its cooking re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C08G18/76C08G18/42C08G18/48C08G18/67C08G18/38
CPCC09J175/14C08G18/36C08G18/3893C08G18/4018C08G18/425C08G18/4812C08G18/4825C08G18/4829C08G18/7671
Inventor 钟树良蔡炳照
Owner JIANGSU LIHE ADHESIVE
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