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 bonding seam, poor aging resistance and unstable curing time, which affects the safe use of lithium-ion batteries and needs to be improved.