Normal-temperature non-viscous sealing adhesive for lithium battery and preparation method for sealing adhesive

Abstract

The invention relates to a normal-temperature non-viscous sealing adhesive for a lithium battery. The normal-temperature non-viscous sealing adhesive comprises the following raw materials in percentage by mass: 5-25 percent of polystyrene, 5-25 percent of polydiene, 5-15 percent of a styrene and butadiene polymer, 5-10 percent of petroleum resin, 1-5 percent of filler, 40-50 percent of a solvent and 0.5-1 percent of an initiator. Under the normal temperature, the adhesive is non-viscous to polypropylene, generates viscosity to polypropylene under high temperature and high pressure and can resist immersion and corrosion of electrolyte. The preparation method for the adhesive comprises the following processing steps: weighing materials; adding all of the styrene and butadiene polymer, the petroleum resin, 30-50 percent of the solvent and 30-50 percent of the initiator into a first reaction kettle, heating the first reaction kettle to be 95-105 DEG C, and performing constant-temperature reaction for 20-40 minutes; adding all of the polydiene, the residual initiator and the residual solvent into a second reaction kettle to be mixed into a mixed liquid, and dropping the mixed liquid into the first reaction kettle; performing constant-temperature reaction for 1.5-2.5 hours, and adding all the polystyrene and the filler into the first reaction kettle for uniform stirring to obtain a finished product. The method is simple in technology and high in production efficiency.

Description

technical field [0001] The invention relates to the technical field of bonding supplies, in particular to a normal-temperature non-tack sealing adhesive for lithium batteries and a preparation method thereof. Background technique [0002] The sealing adhesive for lithium battery is used to bond and fix the battery cell and the battery outer packaging material. Because aluminum-plastic film has good chemical stability and high tensile strength, it is often used as an outer packaging material for lithium batteries; aluminum-plastic film is composed of polypropylene, aluminum, and nylon, and polypropylene and nylon are on both sides of the aluminum. As the outer packaging material of lithium batteries, the polypropylene surface must be able to withstand the immersion and corrosion of the electrolyte used in lithium batteries, and at the same time, it must have good adhesion to the battery cells, so a sealing adhesive should be used for bonding , the sealing adhesive is require...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned defects, the present invention provides a normal temperature non-tacky sealing adhesive for lithium batteries and a preparation method thereof. Adhesive force; the adhesive is composed of saturated non-reactive functional group resin, and the resin is synthesized from low-polarity materials, so the adhesive has good stability to polar substances and can withstand immersion in electrolytes for lithium batteries and corrosion; the adhesive is insoluble in the electrolyte solution for lithium batteries and does not participate in electrochemical reactions; the adhesive uses the principle of molecular diffusion to reasonably match the type of raw materials. Below 40°C, some raw materials show delamination. After the above high temperature and high pressure, the molecules will diffuse to produce bonding properties and achieve the purpose of permanent bonding.

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