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Deep-drawing-resistant two-component adhesive composition for lithium battery aluminum-plastic film and preparation method thereof
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A technology of aluminum-plastic film and lithium battery, applied in the field of aluminum-plastic film, can solve the problems of easy curling, poor dismantling resistance and insufficient of aluminum-plastic film
Active Publication Date: 2021-05-25
SHANGHAI CHENGYING NEW MATERIALS +2
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[0006] 2. The domestic adhesive formula is poor, and it is prone to delamination and peeling problems and insufficient deep drawing
[0007] At present, the outer layer glue on the market has partially solved the problems of insufficient peel strength, heat-resistant delamination or yellowing of the glue layer and cracks in a high-temperature environment for a long time when it is applied to aluminum-plastic film, but there are still deep problems. The depth of the punch is shallow, which seriously affects the energy density of the battery
The maximum drawing depth of aluminum-plastic film products produced in my country is about 5mm, which has never been able to meet good performance requirements
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preparation example Construction
[0039] The preparation method of the self-synthesizing nitrogen-modified novolak epoxy resin that adopts may further comprise the steps:
[0040] A1. Weigh 100g of phenol, 240g of xyleneformaldehyde resin (XF) and toluenesolvent according to a certain proportion, add them into the reactor and stir until fully dissolved, fill with nitrogen (50ml / min) and heat up to 170°C, add 50ppm of acidic catalyst to continue Reflux reaction for 2h, until the moisture is complete, to obtain modified xylenebenzoic acid resin (PXF);
[0041] A2. Cool the reaction to below 100°C, add 150ppm of basic catalyst, raise the temperature to reflux temperature, and add 147g of tris(2,3-epoxypropyl)isocyanurate (TGIC) and appropriate amount of toluenesolvent to react after the reflux becomes clear 4h, to obtain nitrogen-modified epoxy resin.
[0042] The preparation method of the acid-modified epoxy resin that adopts may further comprise the steps:
[0043] Under the action of a catalyst, add epox...
Embodiment 1-5
[0050] The present embodiment 1-5 relates to a kind of heat-resistant glue applied to lithium-ion battery outer packaging composite film to improve the outer layer and its preparation method. The formula is shown in Table 1. The method includes the following process steps:
[0051] (1) Add the solvent and polyol to the reaction kettle first, raise the temperature until the reaction kettle is at a constant temperature of 50°C, and keep stirring;
[0052] (2) Add polyester resin, modified epoxy resin, and polyether polyol to the reaction kettle slowly while keeping stirring, and stir for about 2.5 hours;
[0053] (3) After stirring evenly, slowly add additives and keep stirring at high speed for about 30 minutes;
[0054](4) When all the components are mixed evenly, stop the machine and mature for more than 12 hours;
[0055] (5) Measure the solid content and adjust to 30%;
[0056] (6) Stir slowly for about 1 hour, weigh and pack.
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Abstract
The invention relates to a deep-drawing-resistant two-component adhesive composition for aluminum-plastic films of lithium batteries and a preparation method thereof. The composition includes a main agent and a curing agent; the main agent includes the following groups in weight percent Parts: polyester resin 5-20%, nitrogen-containing phenolic epoxy resin 3-9%, acid-modified epoxy resin 3-9%, polyether polyol 1-5%, polyol 1-5%, additives 0.1-0.5%, solvent 52-80%. The composition of the present invention has the following beneficial effects: 1. Significantly improve the tensile properties of the film, and the deep drawing can reach up to 15mm; 2. Higher initial and post-stretching peeling force and thermal peeling force; 3. High temperature and high humidity The outer layer of the environment undercut film is not delaminated; 4. Under the high temperature environment for a long time, the outer layer will not turn yellow or crack.
Description
technical field [0001] The invention relates to the technical field of aluminum-plastic films, in particular to a deep-drawing-resistant two-component adhesive composition for aluminum-plastic films of lithium batteries and a preparation method thereof. Background technique [0002] With the development of technology, lithium-ion batteries are more and more used by people due to their performance advantages such as large energy density, high output voltage, small self-discharge, and strong cycle discharge. Aluminum-plastic film has the advantages of light weight, thin thickness, and flexible shape design, and has been widely used in many fields such as 3C consumerelectronics, power batteries, and energy storage. Aluminum-plastic film is an important material for packaging pouch batteries, which plays a vital role in the quality of pouch batteries and protects the contents. As the key link with the highest barriers in the lithium battery industry chain, the global aluminum-...
Claims
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