Moisture Barrier Composite Film And Its Preparation Method

• US 20160046523A1
• Filed: 10/22/2014
• Published: 02/18/2016
• Est. Priority Date: 08/18/2014
• Status: Abandoned Application

• Current Assignee: Chung-Yuan Christian University
• Original Assignee: Chung-Yuan Christian University
• Inventors: Chen, Jung-Tsai, Hu, Chien-Chieh, Lee, Kueir-Rarn, Lai, Juin-Yih
• Application Number:
  US14/521,087
• Publication Number:
  US 20160046523A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B29C 39/025 for making multilayered articles
• CPC Class Codes: B29C 39/123 Making multilayered articles
• CPC Class Codes: B29C 41/12 Spreading-out the material on a substrate , e.g. on the surface of a liquid
• CPC Class Codes: B29L 2007/00 Flat articles, e.g. films or sheets B29L2024/00 takes precedence
• CPC Class Codes: B29L 2009/005 coated
• CPC Class Codes: C03C 17/42 at least one coating of an organic material and at least one non-metal coating
• CPC Class Codes: C03C 2217/43 consisting of a dispersed phase in a continuous phase
• CPC Class Codes: C03C 2217/76 Hydrophobic and oleophobic coatings
• CPC Class Codes: C03C 2218/32 After-treatment
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes

Abstract

The invention provides a moisture barrier composite film, formed by having a mixture of thermally reduced graphene and cyclic olefin copolymer be formed into a film and forming a hydrophilic surface layer on surfaces of the moisture barrier composite film by a hydrophilic agent; wherein a ratio of carbon atoms to oxygen atoms in thermally reduced graphene is more than 30 and the hydrophilic surface layer has a density of 0.01˜1.0 mg/cm².

Claims

1. A method for preparing a moisture barrier composite film, comprising:

providing a graphene dispersed solution;

dissolving cyclic olefin copolymer in the graphene dispersed solution to obtain a casting solution;

performing a solution film casting procedure to coat the casting solution on a glass substrate to form a coating film; and

performing a film drying procedure to dry the coating film to separate from the glass substrate to obtain a moisture barrier composite film.

2. The method according to claim 1, further comprising:

performing a surface modification procedure to modify surfaces of the moisture barrier composite film to become hydrophilic by using a hydrophilic modifier to coat on the surfaces of the moisture barrier composite film by a drop casting method to form a hydrophilic surface layer on the surfaces of the moisture barrier composite film after drying.

3. The method according to claim 2, wherein the hydrophilic modifier is made by dissolving an amphoteric polymer in an ethanol containing aqueous solution.

4. The method according to claim 3, wherein the amphoteric polymer is (poly(ethylene oxid)-poly(propylene oxid)-poly(ethylene oxid) triblock copolymer or poly(4-styrenesulfonic acid), the ethanol containing aqueous solution is an aqueous solution containing 20 wt % of ethanol and the hydrophilic surface layer has a density with a range of 0.01˜

1.0 mg/cm².

5. The method according to claim 1, wherein the graphene dispersed solution is obtained by thermally reduce graphene oxide to produce thermally reduced graphene and dissolving the thermally reduced graphene in chloroform.

6. The method according to claim 1, further comprising:

performing a stripping procedure after the film drying procedure to separate from the glass substrate to obtain a moisture barrier composite film.

7. The method according to claim 1, wherein the cyclic olefin copolymer is formed by polymerization of ethylene and norbornene.

8. The method according to claim 5, wherein the thermally reduced graphene has a molar fraction of oxygen element be less than 3 mol %.

9. A moisture barrier composite film, formed by having a mixture of thermally reduced graphene and cyclic olefin copolymer be formed into a film and forming a hydrophilic surface layer on surfaces of the moisture barrier composite film by a hydrophilic agent;

wherein a ratio of carbon atoms to oxygen atoms in thermally reduced graphene is more than 30 and the hydrophilic surface layer has a density of 0.01˜

1.0 mg/cm².

10. The moisture barrier composite film according to claim 9, wherein the thermally reduced graphene in the moisture barrier composite film is 0.05˜

0.8 wt %;

the hydrophilic agent is poly(4-styrenesulfonic acid); and

the hydrophilic surface layer has a density of 0.1 mg/cm².

11. The moisture barrier composite film according to claim 9, wherein the thermally reduced graphene in the moisture barrier composite film is 0.05˜

0.8 wt %; and

the hydrophilic agent is (poly(ethylene oxid)-poly(propylene oxid)-poly(ethylene oxid) triblock copolymer; and

the hydrophilic surface layer has a density of 0.01 mg/cm².

12. The moisture barrier composite film according to claim 9, wherein the moisture barrier composite film has a water contact angle of less than 60 degrees and has a water vapor permeation rate of less than 1.0 g·

mm/m²/day.

13. The moisture barrier composite film according to claim 9, wherein the thermally reduced graphene in the moisture barrier composite film is about 0.06 wt %;

the hydrophilic agent is (poly(ethylene oxid)-poly(propylene oxid)-poly(ethylene oxid) triblock copolymer;

the hydrophilic surface layer has a density of 0.01 mg/cm²; and

the moisture barrier composite film has light transmittance of more than 85% and a water vapor permeation rate of less than 0.07 g·

mm/m²/day.

14. The moisture barrier composite film according to claim 9, wherein the moisture barrier composite film has a glass transition temperature higher than the cyclic olefin copolymer that forms into the moisture barrier composite film.

15. The moisture barrier composite film according to claim 9, wherein the moisture barrier composite film has a glass transition temperature of higher than 95°

C.