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Heat-conducting BOPP (Biaxially-oriented Polypropylene) film

A film and film preparation technology, applied in the direction of coating, polyurea/polyurethane coating, etc., can solve problems such as structural defects, limited improvement of thermal conductivity, mechanical properties that cannot meet the requirements, etc., to achieve increased viscosity, avoid interface separation, and heat conduction good performance

Pending Publication Date: 2022-08-05
QIMING NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The number of layers of graphene has a great influence on the performance of graphene, but the structural characteristics of graphene itself make it easy to re-stack. Applying graphene in BOPP film is prone to structural defects, and the improvement of thermal conductivity is limited. , and the mechanical properties cannot meet the requirements

Method used

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  • Heat-conducting BOPP (Biaxially-oriented Polypropylene) film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a thermally conductive BOPP film, comprising the following steps:

[0027] S1, mix 10kg of ethanol, 1kg of polyvinylpyrrolidone, and 5kg of water evenly, add 1kg of graphene, ultrasonically peel for 1h, centrifuge for 2min at a speed of 10000r / min, take the supernatant, add 1kg of 4,4-diaminodiphenyl Ether and 1kg of pyromellitic dianhydride were reacted for 1h, and 1kg of water-based polyurethane was added to disperse evenly to obtain a graphene / polyurethane composite dispersion;

[0028] S2. The BOPP membrane was cleaned with deionized water and acetone to remove surface impurities, dried and immersed in an aqueous solution of ammonium persulfate with a mass fraction of 10%, and irradiated with a UV high-pressure mercury lamp for 2 minutes with a light intensity of 8000 μw / cm 2 , λ is 254nm, and then immersed in water at 30°C for 1min to obtain a surface-activated BOPP film;

[0029] S3. The graphene / polyurethane composite dispersion is spin-co...

Embodiment 2

[0031] A method for preparing a thermally conductive BOPP film, comprising the following steps:

[0032] S1, mix 20kg ethanol, 3kg polyvinylpyrrolidone, and 15kg water evenly, add 5kg graphene, ultrasonically peel for 2h, centrifuge 5min at a speed of 12000r / min, get the supernatant, add 3kg 4,4-diaminodiphenyl Ether and 2kg of pyromellitic dianhydride were reacted for 2h, and 5kg of water-based polyurethane was added to disperse evenly to obtain a graphene / polyurethane composite dispersion;

[0033] S2. The BOPP membrane was washed with deionized water and acetone to remove surface impurities, dried and immersed in an aqueous solution of ammonium persulfate with a mass fraction of 16%, and irradiated with ultraviolet high-pressure mercury lamp for 6 minutes, and the light intensity was 9000 μw / cm 2 , λ is 254nm, and then immersed in water at 50°C for 2min to obtain a surface-activated BOPP film;

[0034] S3. The graphene / polyurethane composite dispersion is spin-coated on th...

Embodiment 3

[0036] A method for preparing a thermally conductive BOPP film, comprising the following steps:

[0037] S1, mix 13kg of ethanol, 2.5kg of polyvinylpyrrolidone and 8kg of water, add 4kg of graphene, ultrasonically peel for 70min, centrifuge for 3min at a speed of 11500r / min, take the supernatant, add 2.5kg of 4,4-diamino Diphenyl ether and 1.3kg of pyromellitic dianhydride were reacted for 110min, and 2kg of water-based polyurethane was added for uniform dispersion to obtain graphene / polyurethane composite dispersion;

[0038] S2. The BOPP membrane was cleaned with deionized water and acetone to remove surface impurities, dried and immersed in an aqueous solution of ammonium persulfate with a mass fraction of 14%, and irradiated with ultraviolet high-pressure mercury lamp for 3 minutes, and the light intensity was 8800 μw / cm 2 , λ is 254nm, and then immersed in water at 35°C for 1.7min to obtain a surface-activated BOPP film;

[0039] S3. The graphene / polyurethane composite d...

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Abstract

The invention discloses a heat-conducting BOPP (Biaxially-oriented Polypropylene) film. The invention discloses a preparation method of the heat-conducting BOPP film, which comprises the following steps: reducing the surface tension of a system by using ethanol, dispersing graphene, then adding 4, 4-diaminodiphenyl ether and pyromellitic dianhydride for condensation polymerization, and then mixing with waterborne polyurethane to obtain a graphene / polyurethane composite dispersion liquid; the preparation method comprises the following steps: cleaning a BOPP film with deionized water and acetone to remove surface impurities, drying the BOPP film, immersing the BOPP film in an ammonium persulfate aqueous solution, irradiating the BOPP film with an ultraviolet high-pressure mercury lamp for 2-6 minutes under the conditions that the light intensity is 8000-9000 [mu] w / cm < 2 > and lambda is 254 nm, and soaking the BOPP film in water to obtain a surface-activated BOPP film; and spin-coating the graphene / polyurethane composite dispersion liquid on the surface of the surface-activated BOPP film by using a homogenizer, drying with hot air, and then cleaning and drying to obtain the heat-conducting BOPP film.

Description

technical field [0001] The invention relates to the technical field of BOPP films, in particular to a thermally conductive BOPP film and a preparation method thereof. Background technique [0002] Polypropylene resin is non-toxic and tasteless, and is the lightest of all plastic resins. It has good electrical insulation, withstand voltage, and is easy to form products. It is mostly used in the packaging of food, industrial products and various daily necessities, and various electrical components. packaging, etc. Because polypropylene is easy to process and form, and it is easy to stretch and orientate, it is mostly processed into biaxially oriented polypropylene (BOPP) film by stretching. This film has good optical properties and high mechanical strength, and is mostly used in the preparation of electrical films and microporous films. Among other high value-added functional films, it is widely used in electronics, water treatment, daily chemicals, optics and other fields. ...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08J7/12C08L23/12C09D175/04C09D7/61C08G73/10
CPCC08J7/04C08J7/123C09D175/04C09D7/61C08G73/1007C08G73/1071C08J2323/12C08J2475/04C08K3/042
Inventor 马光跃钟文聪孙凤芝管闯曾磐
Owner QIMING NEW MATERIAL
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