Two-component solvent-free reactive-type polyurethane hot melt adhesive applied to soft package industry and using method of hot melt adhesive

A polyurethane hot melt adhesive, two-component technology, applied in the direction of polyurea/polyurethane adhesive, surface pretreatment bonding method, adhesive heating bonding method, etc., can solve the problem of environmental protection cost, adhesive There are too few glues at the joints, which cannot be used for compounding, etc., to achieve better environmental protection performance, fast curing speed, and good yellowing resistance.

Inactive Publication Date: 2018-09-28
广东华粘新材料研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This appearance problem prevents the solvent-free polyurethane glue on the market from being used for PET / aluminum foil, PET / aluminized PET composites, and such composite structures are widely used in the packaging of food and pharmaceuticals that require high barrier properties , so this type of structure can only be dry compounded with solvent-based adhesives that are not so environmentally friendly and costly.
In addition, when compounding porous fiber structure materials such as paper and non-woven fabrics, the traditional solvent-free glue will be absorbed into the internal structure by the fiber structure due to the long-term flow state with low viscosity, resulting in too little glue at the joint, which will lead to Bonding failure

Method used

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  • Two-component solvent-free reactive-type polyurethane hot melt adhesive applied to soft package industry and using method of hot melt adhesive
  • Two-component solvent-free reactive-type polyurethane hot melt adhesive applied to soft package industry and using method of hot melt adhesive
  • Two-component solvent-free reactive-type polyurethane hot melt adhesive applied to soft package industry and using method of hot melt adhesive

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Embodiment 1

[0038] A two-component solvent-free reactive polyurethane hot-melt adhesive applied to the soft package industry described in Example 1 of the present invention includes component A and component B:

[0039] - The component A includes a prepolymer with isocyanate groups in the side chain, an auxiliary agent, and a first catalyst; wherein the prepolymer has a functionality equal to 1 and its isocyanate content is 20%;

[0040] The prepolymer in component A is formed by the polymerization of polyisocyanate and polyhydroxy compound b, wherein the polyisocyanate is 4,4'-dicyclohexylmethane diisocyanate (H12MDI), i.e. hydrogenated MDI, accounting for the total mass of component A 50% of that; the polyhydroxy compound b is polyester polyol, and the selected Risheng Chemical Co., Ltd. P-2407TL polyester polyol has a hydroxyl value range of 145-175mgKOH / g and a molecular weight of 700 Daltons; wherein polyhydroxy Compound b accounts for 40% of the total mass of component A. Certainly...

Embodiment 2

[0053] The present invention described in Embodiment 2 of the present invention also relates to a method for using a two-component solvent-free reactive polyurethane hot melt adhesive for the plastic film industry, including the following steps:

[0054] (1) Before use, component A and component B are packaged in separate aluminum foil bags for use;

[0055] (2) In the process of use, put A component and B group into the melter and heat them to 80-120°C to melt, and output them to the static mixing tube in proportion (100:50) through the metering pump to mix or mechanically mix the two components. The components are mixed evenly to obtain a two-component solvent-free reactive polyurethane adhesive that meets the specified conditions;

[0056] (3) Preheat the glue-coated substrate until the surface of the substrate reaches 50°C;

[0057] (4) After heating the uniformly mixed polyurethane glue to 100°C, glue the surface of the substrate by spraying, roller coating, flow coating...

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Abstract

The invention discloses a two-component solvent-free reactive-type polyurethane hot melt adhesive applied to a soft package industry. The polyurethane hot melt adhesive is a two-component reactive-type polyurethane hot melt adhesive, uses methylene-bis(4-cyclohexylisocyanate) and an acid anhydride modified polyol as main raw materials and has more excellent environmental protection performance; the adhesive has higher modulus and stronger adhesion at the initial stage of using and a fast curing speed, and is more suitable for improvement of production efficiency and quality management and control of soft package; and using of the methylene-bis(4-cyclohexylisocyanate) makes the cured adhesive more resistant to hydrolysis and chemicals and have better yellowing resistance.

Description

technical field [0001] The invention relates to a two-component solvent-free reactive polyurethane hot-melt adhesive and a usage method thereof, in particular to a two-component solvent-free reactive polyurethane hot-melt adhesive applied to the soft package industry and a usage method thereof. Background technique [0002] The PUR traditionally used in the soft package industry is usually solvent-based polyurethane adhesive and solvent-free one-component polyurethane hot-melt adhesive. The former is not environmentally friendly, while the latter takes a long time to fully cure and requires high environmental humidity. In addition, at present, the composite film is a product of the soft package industry. The general production process is: use glue to compound two layers of plastic film (or aluminum foil, paper) into a whole film. [0003] The soft package industry mainly provides color-printed plastic composite bags and composite films to enterprises such as shelf foods, med...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J5/02C09J5/06C08G18/10C08G18/32C08G18/42C08G18/75C08G18/66
CPCC08G18/10C08G18/3215C08G18/3243C08G18/42C08G18/4202C08G18/758C09J5/02C09J5/06C09J175/06C08G18/6651
Inventor 黄世斌
Owner 广东华粘新材料研究有限公司
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