Flexible nanocellulose-graphene composite membrane and preparation method thereof

A composite technology of nanocellulose and graphene, applied in chemical instruments and methods, materials for heat exchange, etc., can solve the problems of poor mechanical properties such as strength and toughness of pure graphite film, poor compatibility between graphene and silicone rubber, etc. , to achieve the effects of good mechanical properties, excellent flexibility and bending resistance, and simple process

Inactive Publication Date: 2016-08-17
SHANGHAI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Research on anisotropic thermally conductive materials at home and abroad, in the existing technology, the Chinese patent publication number CN103740110A, the publication date is 2014.04.23, the title of the invention is "a kind of directional flexible thermally conductive material and its molding process and application", the invention Disclosed is an oriented flexible thermally conductive material, the main components of which are silicone rubber and anisotropic thermally conductive fillers. The thermally conductive material has good thermal conductivity in a specific direction, but due to poor compatibility between graphene and s

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  • Flexible nanocellulose-graphene composite membrane and preparation method thereof

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Embodiment 1

[0020] A kind of preparation method of flexible nanocellulose-graphene composite film of the present embodiment, comprises the following steps:

[0021] (1). 0.0075g of graphene oxide and 0.1425g of nanocellulose were added to the dispersant respectively, and the graphene oxide dispersion liquid with a concentration of 0.075mg / ml and the nanocellulose dispersion with a concentration of 1.425mg / ml were prepared respectively. solution, ultrasonically dispersed for 1 h, then mixed the above graphene oxide dispersion with the above nanocellulose dispersion at a volume ratio of 1:1, continued stirring and ultrasonication for 0.5 h, to obtain nanocellulose-graphite oxide with a concentration of 0.75 mg / ml The first dispersion liquid of vinyl, described dispersant is deionized water;

[0022] (2). Add a reducing agent to the first dispersion of nanocellulose-graphene oxide obtained in the above step (1), raise the temperature to 90°C, stir for 5 hours, and stir evenly to obtain the s...

Embodiment 2

[0026] The preparation method of a kind of flexible nanocellulose-graphene composite membrane of the present embodiment comprises the following steps:

[0027] (1). 0.03g of graphene oxide and 0.12g of nanocellulose were added to the dispersant respectively, and the graphene oxide dispersion with a concentration of 0.3mg / ml and the nanocellulose with a concentration of 1.2mg / ml were prepared respectively. Dispersion, ultrasonic dispersion for 1h, then mix the above graphene oxide dispersion with the above nanocellulose dispersion at a volume ratio of 1:1, continue stirring and ultrasonication for 0.5h, to obtain a concentration of 0.75mg / ml of nanocellulose-oxidized The first dispersion liquid of graphene, described dispersant is deionized water;

[0028] (2). Add a reducing agent to the first dispersion of nanocellulose-graphene oxide obtained in the above step (1), raise the temperature to 95°C, stir for 2 hours, and stir evenly to obtain the second dispersion of nanocellulo...

Embodiment 3

[0032] A kind of preparation method of flexible nanocellulose-graphene composite film of the present embodiment, comprises the following steps:

[0033](1). 0.06g of graphene oxide and 0.14g of nanocellulose were added to the dispersant respectively, and the graphene oxide dispersion with a concentration of 0.6mg / ml and the nanocellulose with a concentration of 1.4mg / ml were prepared respectively. Dispersion, ultrasonic dispersion for 1h, then the above-mentioned graphene oxide dispersion and the above-mentioned nanocellulose dispersion were mixed at a volume ratio of 1:1, continued stirring and ultrasonication for 0.5h, to obtain nanocellulose-graphite oxide with a concentration of 1mg / ml The first dispersion liquid of vinyl, described dispersant is deionized water;

[0034] (2). Add a reducing agent to the first dispersion of nanocellulose-graphene oxide obtained in the above step (1), raise the temperature to 90°C, stir for 6 hours, and stir evenly to obtain the second disp...

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Abstract

The invention discloses a flexible nano-cellulose-graphene composite film and a preparation method thereof. The mass fraction of the composite film is composed of: graphene 0.1%-90%, nano-cellulose 10%-99.9%, and the preparation steps are as follows: : (1) Prepare a graphene oxide dispersion with a concentration of 0.05-5 mg/ml and a nano-cellulose dispersion with a concentration of 0.05-5 mg/ml, ultrasonically disperse for 1-2 hours, and mix to obtain a concentration of 0.05-5 mg/ml The first dispersion liquid of nanocellulose-graphene oxide; (2) add reducing agent in the first dispersion liquid, heat up, stir, stir evenly, obtain the second dispersion liquid of nanocellulose-graphene; (3) The above-mentioned second dispersion liquid is subjected to centrifugal degassing, and then vacuum-filtered to form a composite film, and the composite film is transferred to an oven, and vacuum-dried to obtain a flexible nanocellulose-graphene composite film. There will be no agglomeration between the graphene sheets in the composite film, and its thermal conductivity in the parallel direction is ≥2W·m ‑1 ·K ‑1 , vertical thermal conductivity ≤0.3W·m ‑1 ·K ‑1 , Thermal conductivity anisotropy ratio ≥ 5.

Description

technical field [0001] The invention relates to a heat-conducting composite film, in particular to a flexible nanocellulose-graphene composite film and a preparation method thereof, belonging to the field of heat-conducting composite materials. Background technique [0002] As a new type of two-dimensional carbon nanomaterial, graphene has high thermal conductivity, high specific surface area and Young's modulus. The thermal conductivity of single-layer graphene at room temperature is as high as 5300 W m -1 •K -1 , is currently known as the material with the highest thermal conductivity, and is a very ideal thermal conductivity filler. [0003] The two-dimensional planar structure of graphene determines the regular arrangement of carbon along the plane, which can endow the composite with anisotropic properties. Anisotropic thermally conductive materials prepared by traditional polymer matrix, such as polyamide-graphene composite materials, silicone rubber-graphene composi...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08K3/04C08J5/18C09K5/14
CPCC08K3/04C08J5/18C08J2301/02C08L2203/16C09K5/14C08L1/02
Inventor 宋娜焦德金丁鹏侯兴双崔思奇施利毅唐圣福
Owner SHANGHAI UNIV
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