Solvent-free polyurethane adhesive for flexible package

A solvent-free polyurethane and adhesive technology, applied in the field of fine chemistry, can solve the problems of the need to improve the wettability of the substrate and the narrow range of the composite substrate, and achieve the effects of good wettability, low cost and high bonding strength

Active Publication Date: 2010-08-04
广东国望精细化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the scope of composite substrates in these two patent documents is narrow, aluminum foil cannot be bonded, and the wettability of substrates needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Preparation of component A: under the protection of nitrogen, add 4 mol of liquefied MDI into the reaction kettle, and then add 1 mol of polyoxypropylene glycol 1000 under the condition of stirring at room temperature, stir for half an hour to mix the raw materials evenly, and raise the temperature to 50°C React for 3 hours, then raise the temperature to 80° C. and react for 2 hours until the reaction is complete. A component was obtained by natural cooling.

[0031] 2) Preparation of component B: compound 1.5 mol of polyester polyol with 3 mol of polyoxypropylene diol 2000.

[0032]In this example, the polyester polyol is a polyester polyol containing hydroxy-terminated styrene-butadiene liquid rubber and (or) carboxyl-terminated nitrile liquid rubber. acid, diethylene glycol, hydroxy-terminated styrene-butadiene liquid rubber and carboxyl-terminated nitrile butadiene liquid rubber are polymerized, and the raw material additions in percent by weight are: adipic aci...

Embodiment 2

[0036] 1) Preparation of component A: under the protection of nitrogen, add 4mol HDI (hexamethylene diisocyanate) trimer and 2mol IPDI (isophorone diisocyanate) into the reaction kettle, and then add 2.0mol polytetrahydrofuran under stirring at room temperature 2000, stir for half an hour to mix the raw materials evenly, react at 70°C for 3 hours, then raise the temperature to 110°C for 4 hours until the reaction is complete. A component was obtained by natural cooling.

[0037] 2) Preparation of component B: compound 5 mol of polyester polyol with 3 mol of polyoxypropylene diol 1000. Wherein the polyester polyol is composed of adipic acid 25, isophthalic acid 20, diethylene glycol 36, castor oil 9, hydroxy-terminated styrene-butadiene liquid rubber 5, carboxyl-terminated nitrile butadiene liquid rubber in percentage by weight. 5 Ontology is aggregated. For the polymerization operation, refer to the corresponding part in Example 1.

[0038] 3) Preparation, use and testing o...

Embodiment 3

[0041] 1) Preparation of component A: under the protection of nitrogen, add 3mol IPDI (isophorone diisocyanate) trimer and 5mol HDI (hexamethylene diisocyanate) trimer into the reaction kettle, and then add 1mol Polyoxypropylene glycol 1000, stirring for half an hour to mix the raw materials evenly, reacting at 65°C for 2 hours, then raising the temperature to 100°C for 2.5 hours until the reaction is complete.

[0042] 2) Preparation of component B: compound 4 mol of polyester polyol with 1.5 mol of polyoxypropylene triol 3000. Among them, polyester polyol is composed of terephthalic acid 30, isophthalic acid 20, diethylene glycol 10, ethylene glycol 35, hydroxyl-terminated styrene-butadiene liquid rubber 2, carboxyl-terminated nitrile The liquid rubber 3 body is polymerized. For the polymerization operation, refer to the corresponding part in Example 1.

[0043] 3) Preparation, use and testing of the adhesive: the preparation is carried out during use, and the adhesive of ...

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Abstract

The invention discloses a solvent-free polyurethane adhesive for a flexible package, which is prepared by at least mixing a component A and a component B, wherein the component A is an endcapped polyurethane prepolymer containing terminal isocyanate groups, and the B component is a combination which is formed by compounding polyether polyol and polyester polyol of liquid styrene butadiene rubber containing terminal hydroxy groups and / or liquid acrylonitrile butadiene rubber containing terminal carboxyl groups. The solvent-free polyurethane adhesive of the invention is suitable for solvent-free compounding of the flexible package and has the advantages of low cost, wide compound substrate range (substrates such as plastic films, aluminum-coated films, aluminum foil and the like can be compounded), high bonding strength (the peeling strength of BOPP / PE reaches more than 4N / 15mm, the peeling strength of PET / VMPET reaches more than 4.5N / 15mm, and the peeling strength of the inner film of PET / AL / PE reaches more than 6N / 15mm), wide application temperature range (25-55 DEG C), long service life of a plastic plate (the service life is longer than 40 minutes when the plastic plate is used at 50 DEG C), good leveling property, no solvent discharge, environmental friendliness and the like.

Description

Technical field: [0001] The invention belongs to the field of fine chemistry, and in particular relates to a solvent-free polyurethane adhesive for flexible packaging. Background technique: [0002] Since the Herberts company in Germany first used solvent-free polyurethane adhesives to make composite film packaging materials in the 1970s, compared with solvent-based adhesives, due to its obvious advantages in economy, safety and environmental protection, it has become popular in Germany and the United States. , Japan and the world have made great progress. In Europe and the United States, the amount of solvent-free composite processing in the past was less than 10% of the total processing of composite film packaging materials, and now more than 80% are processed by solvent-free composite technology. Since Japan began to introduce the first solvent-free lamination machine in 1977, it has developed to more than 100 solvent-free lamination equipment. [0003] The application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C09J175/14B65D65/40B32B7/12
CPCY02W90/10
Inventor 陈宇张晨朱玉合杜中杰杜庆丽
Owner 广东国望精细化学品有限公司
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