Polyurethane adhesive for flexible package of batteries

A polyurethane adhesive and flexible packaging technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of strict drawing depth and moisture resistance requirements, and products that cannot meet the requirements, and achieve good adhesion properties, excellent heat and humidity resistance

Active Publication Date: 2020-02-21
CHINA LUCKY FILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in the manufacturing process of lithium batteries, in order to obtain a larger internal volume of the casing, it is usually expected that the side wall of the casing is higher when the lithium battery packaging sheet is deep-drawn, that is, deeper molding, but the products obtained in the prior art are not Can meet more stringent drawing depth and heat and humidity resistance requirements

Method used

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  • Polyurethane adhesive for flexible package of batteries
  • Polyurethane adhesive for flexible package of batteries
  • Polyurethane adhesive for flexible package of batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. Synthesis of main agent A

[0048] Add 100 parts by mass (the parts by mass here are g, the same below) ethyl acetate into a reaction kettle equipped with mechanical stirring, thermometer, reflux condenser and nitrogen protection, heat to 75°C, and 34.5 parts by mass of butyl acrylate , 16 parts by mass of methyl methacrylate, 1.0 parts by mass of hydroxyethyl methacrylate, 38.5 parts by mass of glycidyl methacrylate, 10 parts by mass of nitrogen vinyl pyrrolidone and 0.5 parts by mass of azobisisobutyronitrile , was continuously added dropwise to the reaction system within 4 hours, and 0.1 parts by mass of azobisisobutyronitrile was added after the heat preservation for 3 hours, and the heat preservation was continued for 3 hours and then lowered to room temperature to obtain the nitrogen vinyl compound modified polyacrylate polyol The solution of A has a solid content of 50%.

[0049] 2. Preparation of adhesive 1

[0050] Curing agent B (Covestro, Desmodos L 75...

Embodiment 2

[0052] 1. Synthesis of main agent A2

[0053] Add 100 parts by mass of ethyl acetate to a reactor equipped with mechanical stirring, a thermometer, a reflux condenser, and nitrogen protection, heat to 75°C, and mix 12.5 parts by mass of methyl methacrylate, 46.5 parts by mass of butyl acrylate, and 2.05 parts by mass of Parts of hydroxyethyl methacrylate, 28.95 parts by mass of cyclohexyl methacrylate, 10 parts by mass of nitrogen vinylpyrrolidone and 0.7 parts by mass of azobisisobutyronitrile were mixed uniformly, and were continuously added dropwise to the reaction system within 4 hours After 3 hours of heat preservation, 0.1 parts by mass of azobisisobutyronitrile was added, and after 3 hours of heat preservation, the solution was lowered to room temperature to obtain a solution of nitrogen vinyl compound-modified polyacrylate polyol A2 with a solid content of 50%.

[0054] 2. Preparation of adhesive 2

[0055] The curing agent B (solid content is 75wt%, NCOwt%=13.3) obta...

Embodiment 3

[0057] 1. Synthesis of main agent A3

[0058] Add 100 parts by mass of ethyl acetate to a reaction kettle equipped with mechanical stirring, thermometer, reflux condenser and nitrogen protection, heat to 75°C, mix 16.9 parts by mass of methyl methacrylate, 41 parts by mass of butyl acrylate, 3.1 parts by mass Parts of hydroxyethyl methacrylate, 19 parts by mass of glycidyl methacrylate, 20 parts by mass of nitrogen vinylpyrrolidone and 0.4 parts by mass of azobisisobutyronitrile were mixed uniformly, and were continuously added dropwise to the reaction system within 4 hours After 3 hours of heat preservation, 0.1 parts by mass of azobisisobutyronitrile was added, and after 3 hours of heat preservation, the solution was lowered to room temperature to obtain a solution of nitrogen vinyl compound-modified polyacrylate polyol A2 with a solid content of 50%.

[0059] 2. Preparation of adhesive 3

[0060] The curing agent B (solid content is 75wt%, NCOwt% = 13.3) obtained by adding...

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Abstract

The invention provides a polyurethane adhesive for flexible package of batteries. The main agent of the adhesive is N-vinyl compound modified polyacrylate polyol with mass-average molecular weight of100,000-300,000, a hydroxyl value of 1-30 mgKOH / g and a glass transition temperature of -20 DEG C to 20 DEG C, and a curing agent of the adhesive is aromatic polyisocyanate. The adhesive disclosed bythe invention has excellent adhesive properties and can endow a packaging sheet with excellent formability and endow a molded packaging shell with wet heat resistance during long-term working in a wetheat environment.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to polyurethane adhesives used in packaging sheets. Background technique [0002] Lithium battery packaging materials usually have a three-layer structure, which are polyamide layer, aluminum layer, and polyolefin layer, and the lamination of aluminum layer and polyamide layer or polyolefin layer is mostly done by dry lamination, that is, using polyol and isocyanate to form After coating and drying, the aluminum foil is laminated with the other layers, and then heated and cured to obtain a flexible packaging sheet that can be applied to lithium batteries. In the later application process, the sheet is drawn deep Finally, a shell with a certain internal volume is obtained. [0003] With the promotion of electric vehicles, the capacity requirements for on-board power supplies are also getting higher and higher, requiring battery packaging materials not only to have good i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/12C08G18/62
CPCC09J175/12C08G18/6283
Inventor 李永杰田丛刘瀛姜伟张希堂李宗
Owner CHINA LUCKY FILM CORP
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