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Nylon film composite material for outer film of lithium-ion polymer battery

A technology of composite materials and nylon films, which is applied in the field of composite nylon materials, can solve problems such as complex relationships, loss of shape retention, and low impact strength, and achieve the effects of improving water resistance, compatibility, and compatibility

Inactive Publication Date: 2013-08-21
刘继福
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its high water absorption, there are still defects such as low dry and low temperature impact strength and deformation after water absorption.
[0003] In the prior art, in order to meet the multi-layer co-extrusion and compounding of the outer layer of the aluminum-plastic composite film flexible packaging material used in the polymer lithium-ion battery, PET and nylon BOPA / aluminum foil are usually selected as the outer packaging barrier layer of the polymer lithium-ion battery. Co-extrusion composites usually use many barrier materials with excellent barrier properties newly developed in recent years, such as MXD6 special nylon film and silicon oxide film as the barrier substrate for the outer layer of aluminum-plastic composite film flexible packaging materials used in polymer lithium-ion batteries, but Due to the large differences in the physical and mechanical properties of the above-mentioned materials in multi-layer co-extrusion, it is often difficult to meet the simultaneous molding of the outer barrier layer of the polymer lithium-ion battery, so that in the process of multi-layer co-extrusion, the fluidity of each layer of material is different. The inconsistency makes the relationship between the cold stamping depth, aluminum foil elongation, and aluminum foil thickness change before and after cold stamping of the most difficult cold stamping flexible packaging material in terms of barrier properties become extremely complicated, which cannot be achieved in multi-layer co-extrusion. After the PP, PE or CPP and the outermost nylon PA or PET of the aluminum foil are compounded, it is difficult to meet the cold stamping formability requirement. The cold stamping depth is 3-12mm or more, and the stamping depth is less than 3mm. Delamination, cracking, Pinhole light leakage, loss of shape retention, and no suitable solution found
This performance of BOPA film will have a great impact on its production and use
For example, after the BOPA film absorbs moisture to a certain extent, it will shrink and deform, which will affect the overprinting accuracy in the printing process, reduce the composite fastness in the compounding process, and cause quality failures such as front and rear misalignment in the bag making process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Under normal temperature and pressure, according to the components specified in Table 1, 50%-80% (wt) of the above-mentioned nylon resin PA polyolefin blend material, 2wt%-20wt% of nylon filler, glass fiber filled coupler 10wt%-29wt% of the joint agent, 8wt%-16wt% of ethylene-vinyl acetate copolymer (EVA) and / or nano-calcium carbonate can be chosen at will, add an appropriate amount of water and stir to obtain a uniform composition solvent. Thereafter, nylon resin raw materials were prepared as described above. There are many factors affecting the reaction of polyolefin-grafted maleic anhydride, mainly including the type and concentration of the initiator, the mass concentration of the monomer, the type and concentration of the additive, the reaction temperature and the reaction time, etc. When the concentration of initiator dicumyl peroxide DCP increases, the grafting rate increases accordingly, but the amount of DCP is too much, accompanied by cross-linking reaction; ...

Embodiment 2- Embodiment 6

[0043] Example 2-Example 6, according to the content of each combination specified in the following Table 1, repeat the experiment Example 1 and describe the method to implement.

[0044] Table 1

[0045] Content of each component (wt%)

Example 2

Example 3

Example 4

Example 5

Example 6

nylon resin

51

57

60

68

77

Nylon filler

18

10

4

7

3

coupling agent

19

23

22

12

11

(EVA) and / or CaCO

12

10

14

13

9

[0046] In the above-mentioned embodiment, the aqueous solution method can be adopted, and the saline solution is directly sent to the nylon production plant for polycondensation. The PA66 process can be used: PA66 resin drying - raw material mixing - extrusion granulation - injection molding proofing - testing and analysis. Process conditions: extrusion temperature 250--280°C, screw speed 300 rpm, injection temperature 230--260°C. There a...

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Abstract

The invention discloses a nylon film composite material for an outer film of a lithium-ion polymer battery, aiming at providing a nylon film composite material which is stable in thermal property, not easy to absorb moisture, puncture-resistant, high in dry-state and low-temperature impact strength, non-deformable in case of absorbing water, good in multi-layer coextrusion compounding compatibility, balanced in flow extension, and capable of realizing no breakage of a corner in case of an impact depth of 3-12 mm or more. The nylon film composite material disclosed by the invention is realized via the following technical scheme: 8-12 wt% of maleic anhydride (MAH), MAH-blended K resin and graft K-MAH grafted POE (polyolefin elastomer) blend material are contained in a nylon filling body; the nylon filling body takes maleic anhydride grafted polyethylene and ethylene propylene terpolymer rubber as interface compatibilizers; a maleic anhydride grafted elastomer carboxylic acid group is reacted with a polyamide end group or a polyamine group in a main chain to form a grafted copolymer; and epoxy resin siloxane hydrolysate is reacted with an amide group molecular-chain amino group to polymerize the composite material with a multi-element interwoven network. According to the composite material disclosed by the invention, the problem of the phenomenon that PA (polyamide) film heat seal is easy to fold, layer and break at a certain corner is solved.

Description

technical field [0001] The invention relates to a composite nylon material mainly used in polymer lithium ion batteries. Background technique [0002] Polyamide, a general term for thermoplastic resins containing repeated amide groups -[NHCO]- on the main chain of the molecule, is commonly known as nylon (Nylon), and the English abbreviation is PA. PA is a high crystallinity polymer, which will crystallize immediately after stretching, so it cannot be stretched continuously. It must be produced by adding special additives in the traditional two-step production line, and the price is expensive. Since nylon film is a product that is very easy to absorb moisture, it will have adverse effects on the packaging of the polymer lithium-ion battery when it absorbs moisture, such as insufficient composite strength and foaming caused by the water film on the surface. Although it meets different special requirements, it is widely used as a substitute for traditional materials such as m...

Claims

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Application Information

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IPC IPC(8): C08L77/00C08L23/00C08L23/08C08L51/06C08K7/14C08K3/26C08K5/435C08F255/00C08F255/02H01M2/02
CPCY02E60/12Y02E60/10
Inventor 刘继福刘嘉鑫
Owner 刘继福
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