A kind of lithium battery terminal adhesive tape and preparation method thereofTechnical field
The present invention relates to adhesive technology fields more particularly to a kind of lithium battery terminal adhesive tape and preparation method thereof.
Background technique
Common battery mainly has Ni-Cr battery, nickel-metal hydride battery, lead-acid accumulator and lithium battery etc. currently on the market.WithThe demand of the fast development of electronic product, electric car and electric bicycle, lithium battery is increased substantially.Applied to lithium electricityThere is huge demands for the sticking tape of industry.Lithium battery in the production process, needs to roll up positive plate, diaphragm and negative electrode tabIt is coiled into battery core, is then injected into electrolyte.Its core technology applied is the electrolyte sealing of battery, for the purpose of sealing, instituteThe leakproofness improved by Electrode pack into battery is brought using stop adhesive.
The adhesive tape that common acrylic compounds glue is made on the market at present is easy under the highly polar solvent soaking of electrolyteBe corroded infiltration, to lose viscosity, cannot effectively fix the metal tape of battery, lead to battery short circuit, shorten the use of batteryService life, and there are serious security risks.Lithium electricity terminal adhesive tape is a special pressure sensitive adhesive product, in addition to pressure sensitive adhesivePerformance outside, substrate selection, adhesiveness and in terms of also have special requirement.
Summary of the invention
The present invention aiming at the problem that existing lithium battery pressure sensitive adhesive tape is easily corroded, provide a kind of lithium battery terminal adhesive tape andPreparation method.
The technical scheme to solve the above technical problems is that a kind of lithium battery terminal adhesive tape, including substrate andGlue, which is characterized in that according to parts by weight, the glue includes following component: Amino End Group silicone oil is grafted SMA polymer 50-100 parts, 30-120 parts of tackifying resin, 200-750 parts of solvent.
The substrate is one of BOPP film, PET film or CPP film；The Amino End Group silicone oil grafting SMA polymer number is equalMolecular weight is 10000-40000；The tackifying resin is in hydrogenated petroleum resin, hydrogenated terpene resin or hydrogenated rosin resinIt is a kind of；The solvent is toluene, dimethylbenzene, DMF, butanone, tetrahydrofuran, ethyl acetate, hexamethylene, ethyl cyclohexane or positive heptanOne of alkane.
The specific structure of gained Amino End Group silicone oil grafting SMA polymer are as follows:
The preparation method of above-mentioned lithium battery terminal adhesive tape, comprising the following steps: each component is weighed by weight, by solventIt puts into stirred tank, adds amido silicon oil grafting SMA polymer, tackifying resin, be warming up to 80 DEG C, stir 3h, material is completeDissolution, is configured to pressure-sensitive sol solution；20 μm of non-silicon mould releases are applied outside substrate, by substrate inner face with electric field strength for 30,000Volt/centimetre corona is to after 38 dynes, the pressure-sensitive adhesive that coating thickness is 20 μm on substrate, after 100 DEG C of drying 5min, adhesive tapeTail winding.
The beneficial effects of the present invention are: the grafting of Amino End Group silicone oil used in lithium battery terminal adhesive tape of the present invention SMA is poly-Object is closed, while there is polar group and non-polar group segment, it, can be very by the chemical bonding between polymer, fillerCompatibility, heat-resisting quantity and the corrosion resistance of product Yu polarity and non-polar material are improved well；Amido silicon oil is grafted SMA polymerizationObject and hydrogenated petroleum resin and the equal Fails To Respond of electrolyte, bubble electrolyte is non-discolouring, is able to maintain in the electrolytic solution good steadyIt is qualitative；Lithium battery of the present invention is strong with terminal adhesive tape bonding force, and the safe handling coefficient and service life of lithium battery can be improved, systemStandby simple process, is convenient for industrialized production.
Specific embodiment
Below in conjunction with example, present invention is described, and the given examples are served only to explain the present invention, is not intended to limit thisThe range of invention.
Embodiment 1
A kind of lithium battery terminal adhesive tape, including substrate and glue, substrate PET20, according to parts by weight, glue includesFollowing component: the Amino End Group silicone oil that number average molecular weight is 10000 is grafted 50 parts of SMA polymer, 30 parts of hydrogenated petroleum resin, toluene200 parts.
Embodiment 2
A kind of lithium battery terminal adhesive tape, including substrate and glue, substrate PET20, according to parts by weight, glue includesFollowing component: the Amino End Group silicone oil that number average molecular weight is 15000 is grafted 65 parts of SMA polymer, 40 parts of hydrogenated terpene resin, DMF250 parts.
Embodiment 3
A kind of lithium battery terminal adhesive tape, including substrate and glue, substrate PET20, according to parts by weight, glue includesFollowing component: the Amino End Group silicone oil that number average molecular weight is 20000 is grafted 85 parts of SMA polymer, 55 parts of hydrogenated rosin resin, butanone350 parts.
Embodiment 4
A kind of lithium battery terminal adhesive tape, including substrate and glue, substrate BOPP, according to parts by weight, glue includesFollowing component: the Amino End Group silicone oil that number average molecular weight is 30000 is grafted 100 parts of SMA polymer, 100 parts of hydrogenated petroleum resin, second500 parts of acetoacetic ester.
Embodiment 5
A kind of lithium battery terminal adhesive tape, including substrate and glue, substrate CPP, according to parts by weight, glue include such asLower component: the Amino End Group silicone oil that number average molecular weight is 40000 is grafted 90 parts of SMA polymer, 120 parts of hydrogenated terpene resin, ethyl750 parts of hexamethylene.
Embodiment 1-5 lithium battery terminal adhesive tape the preparation method comprises the following steps: weigh each component by weight, solvent investment is stirredIt mixes in kettle, adds amido silicon oil grafting SMA polymer, tackifying resin, be warming up to 80 DEG C, stir 3h, material is completely dissolved, matchesPressure-sensitive sol solution is made；20 μm of non-silicon mould releases are applied outside substrate, by substrate inner face with electric field strength for 30 kv/cm of electricityIt swoons to after 38 dynes, coating thickness is 20 μm of pressure-sensitive adhesive on substrate, and after 100 DEG C of drying 5min, adhesive tape tail is wound.
After 50 DEG C of baking oven curing 48h of adhesive tape obtained by embodiment 1-5, every test is carried out, the results are shown in Table 1.
1. embodiment 1-5 lithium battery terminal adhesive tape test result of table
, the resistance to electrolysis preferable to adhesion property of aluminum foil that can be seen that lithium battery terminal adhesive tape of the present invention from the above test resultCorrosion can prevent electrolyte from permeating from substrate, solve the problems, such as inharmonious after long term high temperature impregnates electrolyte, immersion electrolyteIt is non-discolouring, and electrochemical reaction is not played with electrolyte.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention andWithin principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.