Packaging material and preparation method and application thereof

Abstract

The invention provides a packaging material and a preparation method and application thereof, and belongs to the field of packaging panels. The packaging material provided by the invention contains the transparent sheet-like material and the functional film material with the concave-convex surface, and the transparent sheet-like material does not influence the overall light transmittance of the packaging material and prevents permeation of water vapor; the transparent flaky material has a plane hardened island reef for providing hard contacts for reaction groups, a soft-hard combined surface area is formed, certain microcosmic rigidity and flexibility are kept under the high-temperature and high-humidity condition, external stress deformation can be reduced to the maximum extent, and the strength can be kept; the active group density of the material surface can be increased by performing surface treatment on the functional film material, and the convex-concave surface can greatly increase the contact area between the resin and the functional film in the modified sheet material-resin composite material, so that the initial value of the mechanical strength is increased, and excellent damp and hot performance is obtained under the condition of ensuring the overall light transmittance.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging materials, and in particular to a packaging material and a preparation method and application thereof. Background Art

[0002] Photovoltaic modules are exposed to various natural environments in outdoor environments, among which high temperature and high humidity are one of the important environments. As an important category of photovoltaic modules, lightweight flexible photovoltaic modules are gradually gaining favor from downstream users. Lightweight flexible photovoltaic modules often use transparent resin materials or fiber-reinforced transparent resin composite materials as packaging materials on the front and back sides of photovoltaic modules. When used, functional film materials are usually adhered to their outer surface (air side) to improve the comprehensive environmental performance of the resin and its composite materials as the packaging surface.

[0003] In outdoor high temperature and high humidity environment, the penetration (permeation) of water vapor will be greatly increased. Water molecules can destroy the hydrogen bonds and other secondary bonds between polymer molecules, and even break the polymer bonds, causing chemical degradation of the polymer, thereby reducing the bonding strength between the resin material and the functional film. The weakening of the bonding strength between the films may cause the functional film to fall off in serious cases, thereby reducing the comprehensive performance of the encapsulation layer and shortening the service life of the components. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a packaging material and a preparation method and application thereof. The packaging material provided by the present invention has excellent surface anti-peeling performance.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing a packaging material, comprising the following steps:

[0007] Providing a modified sheet material-resin composite material, wherein the modified sheet material is dispersed in a first base resin, and the modified sheet material is a transparent sheet material modified by a silane coupling agent;

[0008] Providing a functional film with a concave-convex surface;

[0009] The reinforcing fiber material, the second base resin, the modified sheet material-resin composite material and the functional film are sequentially stacked and hot pressed to obtain the packaging material, wherein the concave and convex surfaces of the modified sheet material-resin composite material and the functional film are in contact.

[0010] Preferably, the transparent sheet-like material includes graphene oxide and / or glass flakes.

[0011] Preferably, the mass content of the modified flaky material in the modified flaky material-resin composite material is 0.01 to 50%.

[0012] Preferably, providing a functional film with a concave-convex surface comprises the following steps: sequentially subjecting a functional film material to film formation, surface treatment and first hot pressing to obtain the functional film, wherein the surface treatment is corona or plasma treatment.

[0013] Preferably, the height difference between the concave points and the convex points of the concave-convex surface is 0.1-20 μm.

[0014] Preferably, the concave points and convex points of the concave-convex surface form a shape of a triangle, a trapezoid or a hexagon.

[0015] Preferably, the thickness of the modified sheet material-resin composite material during lamination is 5 to 200 μm.

[0016] Preferably, the hot pressing pressure is 1-10 MPa, the temperature is 80-180° C., and the heat preservation time is 10-120 min.

[0017] The present invention also provides a packaging material obtained by the preparation method of the above technical solution, comprising a reinforcing fiber material layer, a second base resin layer, a modified sheet material-resin composite material layer and a functional film layer arranged in sequence, wherein the functional film layer has a concave-convex surface, and the modified sheet material-resin composite material layer is in contact with the concave-convex surface; the modified sheet material is a transparent sheet material modified by a silane coupling agent.

[0018] The present invention also provides the use of the packaging material described in the above technical solution as a packaging panel in a photovoltaic module.

[0019] The present invention provides a method for preparing a packaging material, comprising the following steps: providing a modified sheet material-resin composite material, wherein the modified sheet material is dispersed in a first base resin, and the modified sheet material is a transparent sheet material modified by a silane coupling agent; providing a functional film with a concave-convex surface; sequentially laminating a reinforcing fiber material, a second base resin, the modified sheet material-resin composite material and the functional film, and then performing hot pressing to obtain the packaging material, wherein the concave-convex surface of the modified sheet material-resin composite material and the functional film are in contact. In the present invention, the transparent sheet material does not affect the overall light transmittance of the packaging material. The sheet material structure can greatly hinder the penetration and transmission of water vapor. The sheet material modified by the silane coupling agent can be fully dispersed in the resin. The excellent performance of the transparent sheet material reduces the influence of water vapor on the bonding structure of active groups between the resin and the surface film in the modified sheet material-resin composite material, and maintains the mechanical strength of the bonding structure to a greater extent. At the same time, the sheet material is distributed to form a planar hardened "island reef" which also provides a hard contact for the reactive group (including hydroxyl, carboxyl, amino, epoxy, cyano, carbonyl, etc.), forming a "soft and hard combination" surface area, which can be used under high temperature and high humidity conditions. Under the conditions of humidity 70-100%, temperature 80-150℃, it maintains a certain micro-rigidity and flexibility, which can minimize external stress deformation and maintain strength; the concave-convex surface can greatly increase the contact area between the resin and the functional film in the modified sheet material-resin composite material, thereby increasing the initial value of the mechanical strength, and improving the inter-surface detachment strength by changing the contact surface morphology, which can effectively improve the initial interlayer peeling strength and the peeling strength after the wet heat test, and obtain excellent wet heat performance while ensuring the overall light transmittance, hindering the penetration and transmission of water vapor, thereby improving the surface peeling performance of the packaging material and extending the service life of the photovoltaic module.

[0020] Furthermore, the transparent sheet-like material includes graphene oxide, and the surface and edge of the graphene oxide have abundant oxygen-containing functional groups such as hydroxyl, carboxyl, epoxy and carbonyl. After modification, it can be fully dispersed in the matrix resin to give full play to the excellent properties of graphene. The nanosheet structure of graphene oxide can effectively improve the surface barrier properties of the packaging material, effectively reduce the infiltration of water vapor and oxygen, and improve the overall high temperature and high humidity resistance of the packaging material.

[0021] Furthermore, surface treatment of the functional film material can increase the density of active groups on the surface of the material, and further improve the anti-peeling performance of the modified sheet material-resin composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure with concave and convex surfaces of different shapes. DETAILED DESCRIPTION

[0023] The present invention provides a method for preparing a packaging material, comprising the following steps:

[0024] Providing a modified sheet material-resin composite material, wherein the modified sheet material is dispersed in a first base resin, and the modified sheet material is a transparent sheet material modified by a silane coupling agent;

[0025] Providing a functional film with a concave-convex surface;

[0026] The reinforcing fiber material, the second base resin, the modified sheet material-resin composite material and the functional film are sequentially stacked and hot pressed to obtain the packaging material, wherein the concave and convex surfaces of the modified sheet material-resin composite material and the functional film are in contact.

[0027] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the art.

[0028] The present invention provides a modified sheet material-resin composite material. The modified sheet material is dispersed in a first base resin, and the modified sheet material is a transparent sheet material modified by a silane coupling agent.

[0029] In the present invention, the transparent sheet material and the silane coupling agent are preferably mixed and modified to obtain a modified sheet material.

[0030] In the present invention, the transparent sheet-like material includes graphene oxide and / or glass flakes, more preferably graphene oxide. The graphene oxide is the most important derivative of graphene, and has rich oxygen-containing functional groups such as hydroxyl, carboxyl, epoxy and carbonyl on its surface and edges. After modification, it can be fully dispersed in the matrix resin to give full play to the excellent properties of graphene. The nanosheet structure of graphene oxide can effectively improve the surface barrier properties of the packaging material, effectively reduce the infiltration of water vapor and oxygen, and improve the overall high temperature and high humidity resistance of the packaging material.

[0031] In the present invention, the transparent sheet-like material is preferably a nano-material, and the maximum diameter of the sheet is preferably ≤500 μm.

[0032] In a specific embodiment of the present invention, the diameter of the graphene oxide is preferably 1-50 μm, the thickness is preferably 1.0-5.2 nm, and the number of layers is preferably 1-6; the diameter of the glass flakes is preferably 50-200 μm, and the thickness is preferably 2-5 μm; the lower the number of layers of the graphene oxide, the higher the quality and the better the light transmittance. It can exert higher performance under the condition of less addition and can better exert the advantages of nanomaterials. The transparent sheet material can exert better effects at a higher diameter-to-thickness ratio.

[0033] In the present invention, the silane coupling agent preferably includes one or more of KH550, KH560 and KH570.

[0034] In the present invention, the mass ratio of the transparent sheet material to the silane coupling agent is preferably 10:5-30, specifically 10:5, 10:10, 10:15, 10:20, 10:25 or 10:30.

[0035] In the present invention, the modification temperature is preferably 50-80°C, specifically 50, 60, 70 or 80°C, and the modification time is preferably 120-300 min, specifically 120, 150, 200, 250 or 300 min.

[0036] In a specific embodiment of the present invention, the modification preferably includes the following steps: placing the transparent sheet-like material in a three-necked flask, adding an organic solvent, stirring and dispersing, then adding the silane coupling agent, stirring, and then heating to carry out the modification.

[0037] In the present invention, the organic solvent is preferably ethanol. The present invention has no special limitation on the amount of the organic solvent, and any amount known to those skilled in the art can be used.

[0038] After the modification is completed, the present invention preferably performs natural cooling, centrifugal filtration and vacuum drying on the obtained product in sequence to obtain the modified sheet material.

[0039] After obtaining the modified sheet material, the present invention mixes the modified sheet material with a first base resin to obtain the modified sheet material-resin composite material.

[0040] In the present invention, the mass content of the modified flaky material in the modified flaky material-resin composite material is preferably 0.01-50%, specifically 0.01%, 0.05%, 0.1%, 0.5%, 1%, 15%, 20%, 30%, 40% or 50%. When the mass content of the modified flaky material is low, the peel strength increases with the increase of the mass content of the modified flaky material. However, when the mass content of the modified flaky material is too large, the modified flaky material has a greater tendency to agglomerate and cannot be effectively dispersed in the first base resin, thereby reducing the gain effect of the modified flaky material.

[0041] In the present invention, the first base resin preferably includes one or more of epoxy resin, polyester resin, polyurethane resin and acrylic resin.

[0042] In a specific embodiment of the present invention, the acrylic resin is preferably purchased from STOMAT (Beijing) Environmental Materials Technology Co., Ltd.

[0043] The present invention has no particular limitation on the specific manner of mixing, and any manner familiar to those skilled in the art may be used.

[0044] The present invention provides a functional film having a concavoconvex surface.

[0045] In the present invention, the functional thin film material is preferably subjected to film formation, surface treatment and first hot pressing in sequence to obtain a functional thin film, wherein a concavoconvex surface is formed on the surface of the functional thin film.

[0046] In the present invention, the functional film material is preferably ethylene-tetrafluoroethylene copolymer (ETFE), polyvinylidene fluoride (PVDF) or polyvinyl fluoride (PVF).

[0047] In the present invention, the thickness of the functional thin film material is preferably 20 to 100 μm, and specifically may be 20, 25, 30, 40, 50, 60, 70, 80, 90 or 100 μm.

[0048] In the present invention, the surface treatment is preferably corona or plasma treatment. The present invention has no special restrictions on the specific parameters of the surface treatment; the role of the surface treatment is to increase the density of active groups on the surface of the material.

[0049] In the present invention, the height difference between the concave points and the convex points of the concave-convex surface is preferably 0.1 to 20 μm, specifically 0.1, 1, 5, 6.4, 10, 15 or 20 μm. The concave-convex surface can greatly increase the contact area between the first base resin and the functional film, increase the physical / chemical bonding force between the functional film and other materials, thereby increasing the initial value of the mechanical strength and improving the adhesion of the film.

[0050] In the present invention, the concavoconvex surface is preferably formed by a first hot pressing.

[0051] In the present invention, the temperature of the first hot pressing is preferably 70-150° C., specifically 70, 90, 120 or 150° C., and the first hot pressing is preferably patterned roller hot pressing to form the concave-convex surface.

[0052] In the present invention, the shape formed by the concave points and convex points of the concave-convex surface is preferably a triangle, a trapezoid or a hexagon. Figure 1 Schematic diagram of the structure with different shapes of concave and convex surfaces. Figure 1 The concavoconvex surface of the present invention will be described.

[0053] In the present invention, the triangle is preferably an equilateral triangle, and the side length a of the equilateral triangle is preferably 0.1 to 30 μm, specifically 0.1, 1, 5, 10, 20 or 30 μm.

[0054] In the present invention, the trapezoid is preferably an isosceles trapezoid, and the length of the upper base a of the isosceles trapezoid is preferably 0.1 to 20 μm, specifically 0.1, 1, 5, 10 or 20 μm, the length of the lower base b is preferably 1.3 to 2 times of the upper base a, specifically 1.3, 1.5 or 2 times, and the height c is preferably 0.1 to 20 μm, specifically 0.1, 1, 5, 10 or 20 μm.

[0055] In the present invention, the hexagon is preferably a regular hexagon, and the side length a of the regular hexagon is preferably 0.1 to 20 μm, specifically 0.1, 1, 5, 10 or 20 μm.

[0056] In the present invention, the film forming method is preferably hot melt casting.

[0057] In a specific embodiment of the present invention, after the functional thin film material is melt-casted to form a thin film, it is preferably subjected to plasma treatment online, and then hot-pressed with a patterned roller to form the concave-convex surface.

[0058] In the present invention, the functional film is preferably a micron-sized film, and the thickness is preferably 1 to 1000 μm, specifically 1, 6.4, 100, 500 or 1000 μm.

[0059] In the present invention, the surface dyne value of the functional film is preferably 40 to 50, specifically 40, 45, 46 or 50. A high surface dyne value indicates that the surface energy of the functional film is higher, and it can react better with the contact material to increase the bonding strength. However, if the surface dyne value is too high, it may damage the functional film.

[0060] After obtaining the modified sheet material-resin composite material and the functional film, the present invention sequentially stacks the reinforcing fiber material, the second base resin, the modified sheet material-resin composite material and the functional film and then performs hot pressing to obtain the packaging material, and the concave and convex surfaces of the modified sheet material-resin composite material and the functional film are in contact.

[0061] In the present invention, the thickness of the modified sheet material-resin composite material during lamination is preferably 5 to 200 μm, specifically 5, 30, 50, 60, 100, 150 or 200 μm. Controlling the thickness of the modified sheet material-resin composite material within the above range can effectively improve the barrier effect against water vapor.

[0062] In the present invention, the reinforcing fiber material is preferably short fiber, long fiber or continuous fiber.

[0063] In the present invention, the reinforcing fiber material is preferably made of glass fiber, cellulose fiber or ultra-high molecular weight polyethylene fiber.

[0064] In a specific embodiment of the present invention, the glass fiber is preferably purchased from China Jushi Co., Ltd. and is a low-alkali glass fiber with a specification of 100g / m 2 .

[0065] In the present invention, the second base resin preferably includes one or more of epoxy resin, polyester resin, polyurethane resin, acrylic resin and polyolefin.

[0066] In a specific embodiment of the present invention, the acrylic resin is preferably purchased from STOMAT (Beijing) Environmental Materials Technology Co., Ltd.

[0067] In a specific embodiment of the present invention, it is preferred to lay the reinforced fiber material in a flat mold, then evenly spread the second base resin on the surface of the fiber material, then evenly cover the modified sheet material-resin composite material on the surface of the second matrix resin, and finally lay the functional film flat on the surface of the modified sheet material-resin composite material, with the concave and convex surfaces contacting the modified sheet material-resin composite material.

[0068] In the present invention, the hot pressing pressure is preferably 1-10 MPa, specifically 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 MPa, and increased pressure can increase the interlayer peeling strength; the temperature is preferably 80-180°C, specifically 80, 100, 120, 140, 160 or 180°C, and the insulation time is preferably 10-120 min, specifically 10, 20, 40, 60, 80, 100 or 120 min.

[0069] In the present invention, the hot pressing is preferably performed in a flat mold.

[0070] After the hot pressing is completed, the present invention preferably stops heating and naturally cools to room temperature to obtain the packaging material.

[0071] The present invention also provides a packaging material obtained by the preparation method described in the above technical scheme, comprising a reinforcing fiber material layer, a second base resin layer, a modified sheet material-resin composite material layer and a functional film layer arranged in sequence, the functional film layer having a concave-convex surface, the modified sheet material-resin composite material layer and the concave-convex surface in contact; the modified sheet material is a transparent sheet material modified by a silane coupling agent.

[0072] The present invention also provides the use of the packaging material described in the above technical solution as a packaging panel in a photovoltaic module.

[0073] The present invention has no particular limitation on the specific manner of the application, and any manner familiar to those skilled in the art may be used.

[0074] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0075] Raw materials in the embodiments and comparative examples:

[0076] Graphene oxide: purchased from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd., diameter: 1-50 μm; thickness: 1.0-5.2 nm; number of layers: 1-6;

[0077] Glass fiber, purchased from China Jushi Co., Ltd., is low-alkali glass fiber, specification 100g / m 2 ;

[0078] Acrylic resin, purchased from STOMAT (Beijing) Environmental Materials Technology Co., Ltd.;

[0079] ETFE, purchased from Shanghai Fujia New Material Technology Co., Ltd., with a thickness of 25 μm;

[0080] Glass flakes were purchased from Shandong Nuocheng New Material Technology Co., Ltd., with a flake diameter of 50-200 μm and a thickness of 2-5 μm.

[0081] Example 1

[0082] 1. Preparation of modified graphene oxide-resin composite materials

[0083] Take 10g of graphene oxide in a 500mL three-necked flask, add 300mL of ethanol, stir and disperse thoroughly, add 20g of KH570, stir for 30min, heat to 65°C, reflux for 150min. After natural cooling, centrifugal filtration, vacuum drying, and the modified graphene oxide was obtained.

[0084] 0.1 g of modified graphene oxide was placed in a mixing cup, and 99.9 g of acrylic resin was added to obtain a modified graphene oxide-resin composite material with a modified graphene oxide mass content of 0.1%.

[0085] 2. Surface treatment of functional films

[0086] In the process of hot melt casting of ethylene-tetrafluoroethylene copolymer, a functional film material, is prepared by hot melt casting. When the thickness of the functional film is controlled to form a film shape, plasma treatment is performed online, and then hot pressing is performed at 100°C through a special patterned roller to form an isosceles trapezoidal concave and convex surface on the surface of the functional film. The height difference between the concave and convex surfaces is 6.4μm, and the surface dyne value is 46.

[0087] 3. Preparation of packaging materials

[0088] Reinforced glass continuous fiber material (1m 2 ), specification 100g / m 2 Lay it in a flat mold, and evenly spread 200g of STOMAT acrylic resin on the surface of the reinforced glass continuous fiber material. Then evenly spread the modified graphene oxide-resin composite material on the surface of the acrylic resin with a thickness of 30μm; then lay the functional film (dyne value 46) flat on the surface of the modified graphene oxide-resin composite material, with the concave and convex surface contacting the modified graphene oxide-resin layer.

[0089] Place the flat mold into the press, adjust the pressure to 1MPa, heat to 140℃, press for 20min, then stop heating and cool to room temperature, and take out the composite packaging material.

[0090] Example 2

[0091] The same as Example 1, except that the mass content of the modified graphene oxide in the modified graphene oxide-resin composite material is 0.05%.

[0092] Example 3

[0093] The same as Example 1, except that the mass content of the modified graphene oxide in the modified graphene oxide-resin composite material is 0.5%.

[0094] Example 4

[0095] The same as Example 1, the only difference is that the preparation parameters of the modified graphene oxide are as follows:

[0096] Take 10g of graphene oxide in a 500mL three-necked flask, add 300mL of ethanol, stir and disperse thoroughly, add 8g of KH570, stir for 30min, heat to 65°C, reflux for 150min. After natural cooling, centrifugal filtration, vacuum drying, and the modified graphene oxide was obtained.

[0097] Example 5

[0098] The same as Example 1, the only difference is that a regular hexagonal concavo-convex surface is formed on the surface of the functional film, and the surface dyne value is 46.

[0099] Example 6

[0100] The same as Example 1, the only difference is that the thickness of the modified graphene oxide-resin composite material is 60 μm when preparing the packaging material.

[0101] Example 7

[0102] The same as Example 1, the only difference is that the pressure during the preparation of the packaging material is 5 MPa.

[0103] Example 8

[0104] The same as Example 1, the only difference is that the modified graphene oxide-resin composite material is replaced by a modified glass flake-resin composite material, and the preparation process of the modified glass flake-resin composite material is as follows:

[0105] Take 15g of glass flakes in a 500mL three-necked flask, add 300mL of ethanol, stir and disperse thoroughly, add 3g of KH570, stir for 30min, heat to 65℃, reflux for 150min. After natural cooling, centrifugal filtration, vacuum drying, and the modified glass flakes were obtained.

[0106] 15 g of modified glass flakes were placed in a mixing cup, and 85 g of acrylic resin was added to obtain a modified glass flake-resin composite material with a modified glass flake mass content of 15%.

[0107] Comparative Example 1

[0108] The same as Example 1, the only difference is that the modified graphene oxide-resin composite material is not used in the preparation of the packaging material.

[0109] Comparative Example 2

[0110] Preparation of graphene oxide-resin composites

[0111] 0.1 g of graphene oxide was placed in a mixing cup, and 99.9 g of acrylic resin was added to obtain a graphene oxide-resin composite material with a graphene oxide mass content of 0.1%.

[0112] Directly reinforce continuous glass fiber material, specification 100g / m 2 Lay it on a flat mold, evenly sprinkle 200g STOMAT acrylic resin powder on the surface of the reinforced glass continuous fiber material, then evenly spread the graphene oxide-resin composite material on the surface of the acrylic resin with a thickness of 30μm, and then spread the ordinary ETFE functional film (surface dyne value 42) on the surface of the graphene oxide-resin composite material.

[0113] Place the flat mold into the press, adjust the pressure to 2MPa, heat to 140℃, press for 20min, then stop heating and cool to room temperature, and take out the composite packaging material.

[0114] The peel strength between the resin and the functional film in the modified graphene oxide-resin composite material of the packaging material was tested according to the GB / T 2790-1995 standard, and the initial peel strength and the peel strength after DH2000 were tested. The results are shown in Table 1, and it can be seen that: adding a transparent flaky structure to the resin material can increase the interlayer peeling performance of the panel. When the content of modified graphene oxide is low, the interlayer peeling strength of the panel increases with the increase of the content of modified graphene oxide. However, when the content of modified graphene oxide is too high, the modified graphene oxide has a greater tendency to agglomerate and cannot be effectively dispersed in the resin, thereby reducing the gain effect of the modified graphene oxide; graphene oxide needs to be fully grafted and modified to ensure that it can be effectively dispersed. The fully dispersed modified graphene oxide flaky structure can effectively block The penetration / permeation of water vapor in a hot and humid environment reduces the destructive effect of water vapor on the bonding of active groups between layers and increases the interlayer peeling force after the action of moisture and heat. Therefore, increasing the thickness of the modified graphene oxide-resin composite material can effectively improve the barrier to water vapor; by changing the contact surface morphology of the functional film, the effective contact area between the functional film and the resin in the modified graphene oxide-resin composite material can be increased, and the inter-surface detachment strength can be improved, thereby effectively improving the initial interlayer peeling strength and the peeling strength after the hot and humid test; higher thermal pressure can also improve the interlayer peeling strength.

[0115] Table 1 Surface peeling performance test results of examples and comparative examples

[0116]

[0117] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for preparing a packaging material, characterized in that: The following steps are involved: Providing a modified sheet material-resin composite material, wherein the modified sheet material is dispersed in a first base resin, and the modified sheet material is a transparent sheet material modified by a silane coupling agent; Providing a functional film with a concave-convex surface; The reinforcing fiber material, the second base resin, the modified sheet material-resin composite material and the functional film are sequentially stacked and hot pressed to obtain the packaging material, wherein the concave and convex surfaces of the modified sheet material-resin composite material and the functional film are in contact.

2. The preparation method according to claim 1, characterized in that: The transparent sheet-like material includes graphene oxide and / or glass flakes.

3. The preparation method according to claim 1, characterized in that: The mass content of the modified flaky material in the modified flaky material-resin composite material is 0.01-50%.

4. The preparation method according to claim 1, characterized in that: The method of providing a functional film with a concave-convex surface comprises the following steps: sequentially subjecting a functional film material to film formation, surface treatment and first hot pressing to obtain the functional film, wherein the surface treatment is corona or plasma treatment.

5. The preparation method according to claim 1, characterized in that: The height difference between the concave points and the convex points of the concave-convex surface is 0.1 to 20 μm.

6. The preparation method according to claim 1 or 5, characterized in that: The concave points and convex points of the concave-convex surface form a shape of a triangle, a trapezoid or a hexagon.

7. The preparation method according to claim 1, characterized in that: The thickness of the modified sheet material-resin composite material during lamination is 5 to 200 μm.

8. The preparation method according to claim 1, characterized in that: The hot pressing pressure is 1-10 MPa, the temperature is 80-180° C., and the heat preservation time is 10-120 min.

9. The packaging material obtained by the preparation method according to any one of claims 1 to 8, characterized in that: The invention comprises a reinforcing fiber material layer, a second base resin layer, a modified sheet material-resin composite material layer and a functional film layer which are arranged in sequence. The functional film layer has a concave-convex surface, and the modified sheet material-resin composite material layer is in contact with the concave-convex surface. The modified sheet material is a transparent sheet material modified by a silane coupling agent.

10. Use of the packaging material according to claim 9 as a packaging panel in a photovoltaic module.

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