Composite polyester film, method for manufacturing the same, and use

Abstract

The present application relates to a composite polyester film. [Means] The composite polyester film comprises a first polyester layer, a second polyester layer, and a third polyester layer, the first polyester layer and the third polyester layer being located on opposite surfaces of the second polyester layer, respectively, and the raw materials for the first polyester layer, the second polyester layer, and the third polyester layer each independently contain, by mass%, 97.0% to 99.9% polyester material and 0.1% to 3.0% additive, the polyester material in the first polyester layer and the third polyester layer each having a terminal carboxyl group content of 40 to 100 mol / t, and the polyester material in the second polyester layer having a terminal carboxyl group content of 5 to 30 mol / t.

Claims

1. A composite polyester film comprising a first polyester layer, a second polyester layer, and a third polyester layer, The first polyester layer and the third polyester layer are located on the surfaces of both sides of the second polyester layer, respectively. The raw materials for producing the first polyester layer, the second polyester layer, and the third polyester layer each independently contain, by mass%, 97.0% to 99.9% polyester material and 0.1% to 3.0% additives. The content of terminal carboxyl groups in the polyester material of the first polyester layer and the third polyester layer is 40 to 100 mol / t, and the content of terminal carboxyl groups in the polyester material of the second polyester layer is 5 to 30 mol / t. Composite polyester film.

2. In mass%, the raw materials for producing the first polyester layer, the second polyester layer, and the third polyester layer each independently contain 99.0% to 99.8% polyester material and 0.2% to 1.0% additives. The composite polyester film according to feature 1.

3. The content of terminal carboxyl groups in the polyester material of the first polyester layer and the third polyester layer is 50 to 100 mol / t, and the content of terminal carboxyl groups in the polyester material of the second polyester layer is 10 to 25 mol / t. A composite polyester film according to any one of claims 1 to 2.

4. The polyester material includes one or more of the following: polyethylene-2,6-naphthalenedicarboxylate, polyethylene terephthalate-1,4-cyclohexanedimethylene terephthalate, polyethylene terephthalate, polycyclohexane-1,4-dimethylene terephthalate, polypropylene-2,6-naphthalenedicarboxylate, polybutylene terephthalate, polytrimethylene terephthalate, polybutylene adipate terephthalate, polybutylene-2,6-naphthalenedicarboxylate, polybutylene-2,5-furanoleate, polyarylate, and derivatives thereof. The composite polyester film according to feature 1.

5. The aforementioned additive includes one or more of the following: a nucleating agent, an antioxidant, a lubricant, and an antistatic agent. Preferably, the nucleating agent comprises one or more of the following: sodium carbonate, triphenyl phosphate, polycaprolactone, benzophenone, aluminum oxide, copper oxide, magnesium oxide, zinc oxide, barium sulfate, magnesium stearate, and sodium benzoate. Preferably, the antioxidant comprises one or more of bisphenol A phosphite and phosphonic acid esters. Preferably, the lubricant comprises one or more of titanium dioxide, silica, siloxane, calcium carbonate, diatomaceous earth, talc powder, kaolin, and acrylic acid esters. Preferably, the antistatic agent comprises one or more of polyethylene glycol, glycerin, polyglycerin, polyether ester, carbon black, graphite, and conductive fibers. The composite polyester film according to feature 1.

6. A method for producing a composite polyester film according to claim 1, Step S1 is a step for producing polyester chip 1, polyester chip 2, and polyester chip 3, wherein each of the polyester chips 1, 2, and 3 is independently produced by mass%, comprising 97.0% to 99.9% polyester material and 0.1% to 3% additives, wherein the content of terminal carboxyl groups in the polyester material of polyester chip 1 and polyester chip 3 is 40 to 100 mol / t, and the content of terminal carboxyl groups in the polyester material of polyester chip 2 is 5 to 30 mol / t. A step of manufacturing a molten polyester material having a first polyester layer, a second polyester layer and a third polyester layer, wherein the first polyester layer, the second polyester layer and the third polyester layer are manufactured in order from the polyester chips 1, 2 and 3, respectively, and the first polyester layer and the third polyester layer are located on both sides of the second polyester layer, step S2, A method for producing a composite polyester film, characterized by comprising step S3, which involves sequentially performing a molding treatment and a heat treatment on the molten polyester material.

7. A base layer comprising a composite polyester film according to claim 1 or a composite polyester film manufactured by the manufacturing method according to claim 6, and a metal layer provided on at least one surface of the base layer, A metallized polyester film characterized by the following features.

8. The thickness of the aforementioned metal layer is 20 to 2000 nm. The metallized polyester film according to feature 7.

9. The material of the metal layer includes one or more of the following: copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, and silver. The metallized polyester film according to feature 7.

10. A metallized polyester film according to claim 7, A composite current collector characterized by the following features.

11. The composite current collector further includes a protective layer provided on the surface of the metal layer of the metallized polyester film. The composite current collector according to feature 10.

12. The thickness of the protective layer is 10 to 150 nm. The composite current collector according to feature 11.

13. The protective layer material includes one or more of the following: nickel, chromium, nickel-based alloy, copper-based alloy, copper oxide, aluminum oxide, nickel oxide, chromium oxide, cobalt oxide, graphite, carbon black, acetylene black, Ketjen black, carbon nanoquantum dots, carbon nanotubes, carbon nanofibers, and graphene. The composite current collector according to feature 11.

14. A composite current collector including the one described in claim 10, An electrode piece characterized by the following features.

15. Including the electrode piece described in claim 14, An electrochemical apparatus characterized by the following features.

16. The electrochemical apparatus described in claim 15, A power consumption device characterized by the following features.

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