CN204431837U - Composite gas Obstruct membrane - Google Patents

Abstract

The utility model discloses a kind of gas barrier film, be followed successively by basement membrane, gas barrier functional layer, bonding coat and diaphragm; Described basement membrane and diaphragm are polymer film; Described gas barrier functional layer is one deck or two-layer or multi-layer graphene film or graphene film and the superposing of nano level metal film.Graphene composite structure provided by the utility model can be used for the seal protection of gas, liquid and solid, and the gas of this graphene composite structure, liquid and solid leakage rate can reduce greatly relative to polymeric seal film and metal sealing film; Also can be used for polymeric membrane heat conduction aspect, Graphene has excellent thermal conductance, so this graphene composite structure that provides of utility model is compared with the polymeric membrane of not graphene-containing, thermal conductivity can improve greatly.

Description

Composite Gas Barrier Film

technical field

The utility model relates to a composite gas barrier film.

Background technique

Polymer film is used as a gas barrier film due to the formation of silicon oxide, aluminum oxide, magnesium oxide, etc. on the surface, which can effectively block oxygen, water vapor, etc., so it is widely used to prevent deterioration of food, industrial supplies, and pharmaceuticals package of. In addition, because it can effectively block gas, etc., it can also be used to seal electronic devices such as solar cells, liquid crystal display elements, and organic EL elements. However, there are grain boundary defects between the oxide particles. As time goes by, some gases or liquids will leak, which cannot be strictly sealed, because there are many holes in the polymer material, and molecules will pass through the holes. The adoption of the metal sealing film will improve the sealing effect, but the sealing effect is still unsatisfactory. People choose to set aluminum foil on the base film, which can obtain stable oxygen and water vapor barrier properties, but the barrier properties to hydrogen and helium with small gas molecular weights are poor. In recent years, people have developed a barrier film formed of polyvinylidene chloride (PVDC) or ethylene-vinyl alcohol copolymer (EVOH), which can also effectively block oxygen, but the former contains chlorine and pollutes the environment, while the latter The barrier property is greatly affected by the environment. The thermal conductivity of ordinary polymer films is very poor. Generally, industrial polymer thermal conductive materials are compounded with boron nitride and aluminum oxide powder as fillers for thermal conductivity. The production process is complicated and the thermal conductivity is relatively low.

Utility model content

The purpose of the utility model is to provide a composite gas barrier film with good sealing performance and simple preparation.

The technical solution to achieve the first purpose of the utility model is a composite gas barrier film, which is a base film, a gas barrier functional layer, an adhesive layer and a protective film in sequence; the base film is a polymer film, such as a PET film or a PE film. film, with a thickness of 10 μm to 250 μm; the adhesive layer is a sticky solid adhesive, such as: OCA optical adhesive or double-sided tape, with a thickness of 2 μm to 250 μm; the protective film is a polymer film, such as PET film or PE The film has a thickness of 10 μm to 250 μm; the gas barrier functional layer is one layer or two layers or multi-layer graphene film or the superposition of graphene and nanoscale metal film.

By adopting the above technical scheme, the utility model has the following beneficial effects: (1) the graphene composite structure provided by the utility model can be used for the sealing protection of gas, liquid and solid, the gas, liquid and solid of this graphene composite structure Compared with the polymer sealing film and metal sealing film, the solid leakage rate can be greatly reduced; it can also be used in the heat conduction of the polymer film. Graphene has excellent thermal conductivity, so the graphene composite structure provided by the utility model is compatible with the Compared with the polymer film of vinyl, the thermal conductivity will be greatly improved.

(2) The utility model provides a variety of structural solutions for composite gas barrier films, including those prepared from graphene films and graphene powders, those containing metal films and those without metal films, all of which fully utilize graphite Excellent sealing performance and ultra-high thermal conductivity of vinyl, good quality and wide choice.

Description of drawings

In order to make the content of the utility model easier to understand clearly, the utility model will be further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

Fig. 1 is a kind of structural representation of the utility model.

Fig. 2 is a second structure schematic diagram of the present invention.

The labels in the accompanying drawings are:

A base film 1 , a gas barrier functional layer 2 , a graphene film 21 , a metal film 22 , an adhesive layer 3 , and a protective film 4 .

Detailed ways

(Example 1)

A method for preparing a composite gas barrier film of this embodiment comprises the following steps:

Step 1: Prepare a base film 1, a growth substrate containing a graphene film 21, and a protective film 4 containing an adhesive layer 3; the base film 1 is a PET film or a PE film with a thickness of 10 μm to 250 μm; the protective film 4 is PET film or PE film with a thickness of 10 μm to 250 μm; the type of adhesive layer 3 is OCA optical adhesive or double-sided adhesive tape, and the raw materials of adhesive layer 3 are silicone rubber, acrylic resin and unsaturated polyester, polyurethane, epoxy One or more combinations of resins, etc., the thickness of the adhesive layer 3 is 2 μm to 250 μm; the method for obtaining the growth substrate containing the graphene film 21 is: chemical polishing, electrochemical polishing, or mechanical polishing. Put the treated copper foil into a closed chemical vapor deposition furnace; pump out the air in the deposition furnace, fill it with 10-200sccm hydrogen and 100-1000sccm argon to keep the pressure in the deposition furnace at normal pressure; heat the deposition Furnace to 900-1050°C, keep at this temperature for 5-40min; pass 1-20sccm hydrocarbon, keep for 5-30min; close hydrocarbon and hydrogen, only pass argon, stop heating at the same time, make the deposition furnace Cool down to room temperature with the furnace; take out the growth substrate of the graphene film 21; the number of layers of graphene in this embodiment is 3-8 layers.

Step 2: Composite the growth substrate containing the graphene film 2 and the protective film 4 containing the adhesive layer 3 by pasting; then remove the growth substrate by one of the chemical stripping or electrochemical stripping methods; obtain the graphene film Composite structure of 21+adhesive layer 3+protective film 4;

Step 3: Composite the composite structure obtained in Step 2 and the base film 1 by pasting.

The structure of the composite gas barrier film obtained by the method of this embodiment is shown in FIG. 1 .

(Example 2)

The difference between the method of this embodiment and that of Embodiment 1 is that the gas barrier functional layer 2 further includes a layer of nanoscale metal film 21 covered by vacuum evaporation or sputtering coating or pulsed laser deposition. The schematic diagram of the structure is shown in Fig. 2 .

(Example 3)

This embodiment is another scheme, and the graphene film is obtained by using graphene powder. The specific steps are:

Step 1: Prepare the base film 1 and the protective film 4; the base film 1 is a PET film or a PE film with a thickness of 10 μm to 250 μm.

Step 2: Form a graphene film 2 on the base film 1; mix the graphene powder and carbon black in a certain proportion, dissolve in deionized water or an organic solution, and choose to add or not add an adhesive; dipping method, scraping Coating method, spray coating method, roll coating method, spin coating method, roll coating method, pour coating method, inkjet method, printing method, cast film forming method, rod coating method, gravure printing method in a method of graphene The powder solution is coated on the base film 1 and dried in air or oven to form a layer of graphene film 2

Step 3: rolling and pasting the protective film 4 containing the adhesive layer 3 on the graphene film 2 .

The structure is shown in Figure 1.

The gas barrier functional layer 2 may also include a layer of nanoscale metal film 21 covered by vacuum evaporation or sputtering coating or pulsed laser deposition to obtain the composite gas barrier film structure shown in FIG. 2 .

(Example 4)

The structure of this example is the same as that of Example 1, and the obtained composite gas barrier film is shown in Figure 1; the graphene film is transferred based on the graphene film obtained by the low-pressure chemical vapor deposition method to obtain a multilayer graphene film. Specifically, the following four methods can be used:

The first method: 2.1 Obtain the growth substrate containing the graphene film 21 under low pressure by chemical vapor deposition;

2.2 Paste the growth substrate with the graphene film 21 on the thermal release tape;

2.3 Remove the growth substrate;

2.4 Paste the thermal release tape containing the graphene film 21 on the base film 1;

2.5 Release the thermal release tape at a temperature of 90-125°C to complete the transfer of the first layer of graphene film 21 from the thermal release tape to the base film 1;

2.6 Pasting the growth substrate with the graphene film 21 on the thermal release tape;

2.7 Remove the growth substrate;

2.8 Paste the thermal release tape containing the graphene film 21 on the graphene film 21 in step 2.5;

2.9 Release the thermal release tape at a temperature of 90-125°C to complete the transfer of the second graphene film layer 21 from the thermal release tape to the first graphene film 21;

2.10 Repeat steps 2.6-2.9 to complete the transfer of the nth graphene layer from the growth substrate to the n-1th graphene layer n is a natural number, n≥1; obtain the composite structure of the gas barrier functional layer 2 and the base film 1;

In step three, the protective film 4 containing the adhesive layer 3 is pasted on the gas barrier functional layer 2 .

The second method: 2.1 Obtain the growth substrate containing the graphene film 21 under low pressure by chemical vapor deposition;

2.2 Paste the growth substrate with the graphene film 21 on the thermal release tape;

2.3 Remove the growth substrate;

2.4 Paste the growth substrate with the graphene film layer 21 on the thermal release tape that has been transferred with a layer of graphene film 21, and remove the growth substrate;

2.5 Repeat step 2.4 to complete the transfer of n-layer (n is a natural number, n≥1) graphene to the thermal release tape;

2.6 Paste the thermal release tape with n-layer graphene film on the base film 1;

2.7 Release the heat release tape at a temperature of 90-125°C to complete the transfer of n-layer graphene to the base film 1; obtain the composite structure of the gas barrier functional layer 2 and the base film 1;

In step three, the protective film 4 containing the adhesive layer 3 is pasted on the gas barrier functional layer 2 .

The third method: 2.1 Obtain the growth substrate containing the graphene film 21 under low pressure by chemical vapor deposition;

2.2 Apply a layer of adhesive on the base film 1;

2.3 Paste the growth substrate with the graphene film 21 on the base film 1;

2.4 Remove the growth substrate;

2.5 Paste the growth substrate with the graphene film 21 on the thermal release tape, and remove the growth substrate;

2.6 Paste the thermal release tape containing the graphene film on the graphene-containing base film 1;

2.7 Release the thermal release tape at a temperature of 90-125°C to complete the transfer of the second layer of graphene film from the thermal release tape to the first layer of graphene film;

2.8 Repeat steps 2.5-2.7 to complete the transfer of the nth graphene layer from the growth substrate to the n-1th layer of graphene layer (n is a natural number, n≥1); obtain the composite of the gas barrier function layer 2 and the base film 1 structure;

In step three, the protective film 4 containing the adhesive layer 3 is pasted on the gas barrier functional layer 2 .

The fourth type: 2.1 Obtain the growth substrate containing the graphene film 21 under low pressure by chemical vapor deposition;

2.2 Paste the growth substrate with the graphene film 21 on the protective film 4 containing the adhesive layer 3;

2.3 Remove the growth substrate;

2.4 Paste the growth substrate with the graphene film 21 on the protective film 4 that has been transferred with a layer of graphene film 21 and contains the adhesive layer 3, and remove the growth substrate;

2.5 Repeat step 2.4 to complete the transfer of n (n is a natural number, n≥1) layers of graphene to the protective film 4 containing the adhesive layer 3; obtain the composite of the gas barrier function layer 2 and the protective film 4 containing the adhesive layer 3 structure;

In step three, the gas barrier functional layer 2 is pasted on the base film 1 .

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. It should be understood that the above descriptions are only specific embodiments of the present utility model and are not intended to limit the present invention. For the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (2)

1. a composite gas Obstruct membrane, is characterized in that: be followed successively by basement membrane (1), gas barrier functional layer (2), bonding coat (3) and diaphragm (4); Described basement membrane (1) and diaphragm (4) are polymer film; Described gas barrier functional layer (2) is one deck or two-layer or multi-layer graphene film (21); Described basement membrane (1) thickness is 10 μm ~ 250 μm; Described bonding coat (3) thickness is 2 μm ~ 250 μm; Described diaphragm (4) thickness is 10 μm ~ 250 μm.

2. a kind of composite gas Obstruct membrane according to claim 1, is characterized in that: described gas barrier functional layer (2) also comprises the nano level metal film (22) covered between basement membrane (1) and graphene film (21).