Graphene Film Prepared with Flexible Polyimide and Preparation Method Thereof

Ping LIU

Patent

Atlas literature

Patent

US 11,078,081

Graphene Film Prepared with Flexible Polyimide and Preparation Method Thereof

Ping LIU

Claims

Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.

3 independent · 8 dependent

1
Independentpolyimide filmpolyimide composite filmcarbonized multifunctional filmvitric carbon multifunctional graphene film
A preparation method of a graphene ﬁlm prepared with ﬂexible polyimide, comprising the following steps: Si: laminating a plurality of polyimide ﬁlms; S2: performing a heat treatment while pressing the laminated polyimide ﬁlms for bonding, wherein the temperature of the heat treatment is lower than the temperature at which a thermoplastic polyimide ﬁlm begins thermal decomposition, so that the laminated polyimide ﬁlms are bonded together to form a polyimide composite ﬁlm; and S 3: raising the temperature of the polyimide composite ﬁlm to be higher than the temperature at which the polyimide ﬁlms begin thermal decomposition for heat treatment and carbonization treatment, thereby obtaining a carbonized multifunctional ﬁlm, and subjecting the carbonized multifunctional ﬁlm to a graphitization treatment, wherein, in step S3, the polyimide composite ﬁlm is placed in a heating furnace, ﬁlled with black lead powder, sealed, heated, and pressurized. Previously presented
1. 2
  Dependent← claim 1polyimide film
  The preparation method of graphene ﬁlm prepared with ﬂexible polyimide according to claim 1, wherein, in step S2, the laminated polyimide ﬁlms are hot- pressed for bonding using a roller hot press. Previously presented
2. 3
  Dependent← claim 1polyimide film
  The preparation method of graphene ﬁlm prepared with ﬂexible polyimide according to claim 1, wherein the temperature at which the polyimide ﬁlms begin thermal decomposition is about 500 ° C, and in step S2, the temperature is raised from 10 ° C to 500 ° C at a processing rate of 1 m/min and under a pressure of 50 kg/cm 2. Previously presented
3. 4
  Dependent← claim 1polyimide film
  The preparation method of graphene ﬁlm prepared with ﬂexible polyimide according to claim 1, wherein each of the polyimide ﬁlms has a thickness of 50 m and a glass transition temperature of 400 ° C, and the temperature at which the polyimide ﬁlms begin thermal decomposition is about 500 °C. Previously presented
4. 5
  Dependent← claim 1polyimide composite filmcarbonized multifunctional film
  The preparation method of graphene ﬁlm prepared with ﬂexible polyimide according to claim 1, wherein, in step S3, the temperature of the polyimide composite ﬁlm is raised from 500 ° C to 1000 0 C-1500 0 C at a processing rate of 1 m/min, and the polyimide composite ﬁlm is subjected to carbonization treatment under a pressure of 75 kg/cm 2. Previously presented
5. 7
  Dependent← claim 1carbonized multifunctional filmvitrified carbon film
  The preparation method of graphene ﬁlm prepared with ﬂexible polyimide according to claim 1, wherein, in step S3, the graphitization treatment includes graphitizing the carbonized multifunctional ﬁlm by raising the temperature from 1500 ° C to 2000 ° C in a graphitization furnace at a processing rate of 0.5 m/min and under a pressure of 100 kg/cm 2 to obtain a vitriﬁed carbon ﬁlm. Previously presented
6. 11
  Dependent← claim 1polyimide composite film
  The preparation method of graphene ﬁlm prepared with ﬂexible polyimide according to claim 1, wherein the temperature of the polyimide composite ﬁlm is raised in a non-oxidizing
6
Independent
Canceled
10
Independent
Canceled

Materials

Materials described outside the worked examples.

polyimide film

Precursor Film

polyimide composite film

Intermediate

carbonized multifunctional film

Process steps

Additional fabrication and treatment steps described in the patent.

Lamination

Step 1

Process details

step:S₁

description:laminating a plurality of polyimide films

Materials:polyimide filmpolyimide composite film

Reported properties

Performance values and ranges asserted in the specification or claims.

Property	Value	Material
in-plane (ab direction) thermal conductivity	1500 W/(m·K)	vitric carbon multifunctional graphene film

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