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Insulation volume swelling adhesive tape and production process thereof

A production process and tape technology, applied in the direction of adhesives, other rubber adhesives, film/flake adhesives, etc., can solve the problems of poor high temperature resistance, affecting service life, insufficient tear strength, etc. The effect of reduced battery life and improved tear strength

Pending Publication Date: 2022-05-13
东台瑞冠高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to fill the gap and fix the electrode assembly. The existing swelling tapes for lithium batteries are generally poor in high temperature resistance, and the tear resistance of the product is not enough, which affects its service life.

Method used

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  • Insulation volume swelling adhesive tape and production process thereof
  • Insulation volume swelling adhesive tape and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as Figure 1-2 As shown, the insulating volume swelling tape and its production process according to the embodiment of the present invention include the following steps;

[0026] S1, mixing and reacting 20-30 parts by weight of polyisocyanate compound and 10-15 parts by weight of chain extender to form polyester thermoplastic polyurethane solution (soft zone);

[0027] S2, utilize the DMF solution of 70 weight parts and the MEK solution of 30 weight parts to carry out physical stirring with the rigid polyurethane that mold equivalent is 350 and obtain polyester thermoplastic polyurethane solution (hard region);

[0028] S3. Mix the S1 and the S2 at a ratio of 1:1 by weight, add 50 parts by weight of titanium dioxide in the solid proportion after mixing, add 1-3 parts by weight of polyisocyanate curing agent again, and mix thoroughly After making polyurethane solution;

[0029] S4. Use 100 parts by weight of high-viscosity removable glue, add 0.8-2 parts by weight...

Embodiment 2

[0031] Such as Figure 1-2 As shown, a production process of an insulating volume swelling tape is provided, which is used for the insulating volume swelling tape, comprising the following steps;

[0032] S5. Use the slit coating head of the bridge-type coating machine to evenly coat the fully mixed TPU solution on the release surface of the polyester release film with a residual adhesion of 30-70%, and use the bridge-type oven to increase the temperature , The coated product is dried at a temperature of 40°C-160°C in a decreasing manner to prepare the base film of the insulating volume swelling tape;

[0033] S6. Put the coated polyurethane base film together with the polyester release film in a constant temperature room of 40-70°C for 24-48 hours of curing so that the polyisocyanate curing agent undergoes a chain reaction in the TPU to improve the insulation volume swelling tape tear strength;

[0034] S7. In order to make the polyurethane base film sticky, it is necessary...

Embodiment 3

[0037] Such as Figure 1-2 As shown, the other side of the polyurethane-based film is coated with one of acrylic glue, rubber glue, silicone glue, and amino glue.

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Abstract

The invention discloses an insulating volume swelling adhesive tape and a production process thereof. The preparation method comprises the following steps: mixing 20-30 parts by weight of a polyisocyanate compound and 10-15 parts by weight of a chain extender to react to form a polyester type thermoplastic polyurethane solution, and physically stirring hard polyurethane with the modulus equivalent of 350 by using 70 parts by weight of a DMF solution and 30 parts by weight of an MEK solution to prepare the polyester type thermoplastic polyurethane solution, the S1 and the S2 are mixed according to the weight part ratio of 1: 1, 50 parts by weight of titanium dioxide accounting for the solid proportion after mixing is added, 1-3 parts by weight of a polyisocyanate curing agent is added again, and the polyurethane solution is prepared after sufficient mixing. The invention has the beneficial effects that the tear strength is greatly improved, the temperature resistance is improved to 120 DEG C from the original 80 DEG C, and the volume of the product in the battery is increased after the product is soaked in electrolyte for two hours, so that the battery is filled with the product.

Description

technical field [0001] The invention relates to the technical field of swelling tapes, in particular to an insulating volume swelling tape and a production process thereof. Background technique [0002] When the electrode assembly is accommodated in a cylindrical case to manufacture a battery, the size of the electrode assembly is generally smaller than that of the cylindrical case. Therefore, a gap may be formed between the electrode assembly and the inner wall of the case. In this case, the electrode assembly accommodated in the case may move inside the case due to external vibration or external impact. Such movement of the electrode assembly may result in an increase in the internal resistance of the battery or damage to the electrode sheet, thereby greatly deteriorating the performance of the battery. Therefore, it is necessary to fill the gap and fix the electrode assembly. The existing swelling tapes for lithium batteries are generally poor in high temperature resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/25C09J7/24C09J7/30C09J7/40C09J133/00C09J121/00C09J183/04C09J201/02
CPCC09J7/25C09J7/243C09J7/255C09J7/30C09J7/401C09J133/00C09J121/00C09J183/04C09J201/025C09J2203/33C09J2301/122C09J2421/006C09J2423/046C09J2423/106C09J2467/006
Inventor 印平
Owner 东台瑞冠高分子材料有限公司