Two-component polyurethane resin adhesive for flexible packaging film of polymer lithium ion battery and preparation method thereof

Abstract

The invention discloses a two-component polyurethane resin adhesive for a flexible packaging film of a polymer lithium ion battery and a preparation method thereof. The technical scheme essentially includes that the two-component polyurethane resin adhesive includes an adhesive A and an adhesive B with the weight ratio of (3-5):1. The adhesive A includes the following components in parts by weight: 16-24 parts of castor oil, 55-75 parts of ethylene glycol, 12-18 parts of polyester polyol, 14-18 parts of carbamyl urea, 8-12 parts of 2,2-dimethylolpropionic acid, 1-2 parts of a chain extender, 1-2 parts of a flame retardant, and 1-2 parts of a thixotropic agent; the adhesive B includes the following components in parts by weight: 24-32 parts of diphenylmethane diisocyanate, and 3-6 parts ofan activator. The castor oil and polyester polyol with high viscosity and good fluidity can guide ethylene glycol to undergo a condensation reaction and be combined with the chain extender to form OH-terminated polyester polyol with longer molecular chain and larger molecular weight, so that heat resistance and strength are significantly improved; the flame retardant can play a role in enhancing the flame retardancy of the OH-terminated polyester polyol; the thixotropic agent can play a role in enhancing the consistency of the OH-terminated polyester polyol.

Description

technical field [0001] The present invention relates to a kind of polyurethane resin adhesive, more specifically it relates to a kind of two-component polyurethane resin adhesive used for polymer lithium ion battery flexible packaging film and its preparation method. Background technique [0002] Adhesives used in the lithium-ion flexible packaging industry include one-component polyurethane adhesives, two-component polyurethane adhesives, acrylic adhesives, and water-soluble polyurethane adhesives. The two-component polyurethane adhesive is the most important category of polyurethane. It is used in a large amount and has a wide range of uses. It is divided into two components, one of which is a hydroxyl-containing component, and the other is a The components of free isocyanate groups, and after the raw materials of the two components are mixed, the corresponding reaction occurs, chain extension, crosslinking and rapid formation of a strong adhesive layer, and after adding a...

AI Technical Summary

Problems solved by technology

[0004] However, the toughness of the two-component polyurethane adhesive is poor, which leads to the problems of easy cracking of the bo