Integrated laminated light-weight frame for photovoltaic module and preparation method of integrated laminated light-weight frame

Abstract

The invention discloses an integrated laminated light-weight frame for a photovoltaic module and a preparation method of the integrated laminated light-weight frame, and belongs to the technical field of photovoltaic module frame manufacturing. Glass fiber cloth is used as a reinforcing main body, and is prepared into a semi-cured adhesive film with certain viscosity at normal temperature through processes of infiltrating self-made adhesive resin, performing heat treatment and pre-drying and cutting; then the semi-cured adhesive film is pasted to the frame of the assembly, and the effect of integrated forming is achieved through assembly lamination and synchronous curing; the interface shear strength of the frame and the assembly is improved, and the problem of insufficient interface bonding force of a light frame in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of frame manufacturing of photovoltaic modules, and particularly relates to an integrated laminated lightweight frame for a photovoltaic module and a preparation method thereof. BACKGROUND

[0002] Lightweight of photovoltaic modules has become an important development trend in the industry, and the lightweight design of the frame, as an important component of the module, directly affects the weight, cost and installation convenience of the module. The frame of a photovoltaic module is a frame structure for fixing and sealing the photovoltaic module, and has a crucial influence on the service life and performance of the module. The traditional frame of a photovoltaic module is made of aluminum alloy material, which has good mechanical strength and weather resistance, but has problems such as large weight (about 30% of the total weight of the module), high cost and complex installation. With the diversification of photovoltaic application scenarios and the complication of installation environment, lightweight frame technology has emerged and developed rapidly.

[0003] In recent years, composite material frames (such as glass fiber reinforced polyurethane) have gradually emerged due to their lightweight advantage, but the existing technology uses a rear-mounted structure for the composite material frame, which needs to be cured separately and then connected to the module through adhesive or mechanical fixation, and has problems such as insufficient interfacial bonding strength and complicated production process. In addition, the traditional composite material frame is prone to deformation or delamination during high-temperature lamination, which affects the reliability of the module. SUMMARY

[0004] The application provides an integrated laminated lightweight frame for a photovoltaic module and a preparation method thereof. A semi-cured adhesive film with certain adhesion at room temperature is prepared, and the product is pasted on the frame of the module. Through module lamination, synchronous curing is achieved to achieve the effect of integrated molding. The problem of insufficient interfacial bonding force of the lightweight frame in the prior art is solved.

[0005] To achieve the above purpose, the following technical solutions are adopted in the application. An integrated laminated lightweight frame for a photovoltaic module, which is a semi-cured adhesive film with adhesion at room temperature and is synchronously cured with module lamination. The adhesive film uses glass fiber cloth as the main reinforcing and reinforcing body and is impregnated with a self-made adhesive resin.

[0006] The self-made adhesive resin is composed of the following components by mass percentage: 20%-40% pressure-sensitive adhesive resin, 40%-60% epoxy resin, 2%-10% latent curing agent, 1%-5% accelerator, and 10%-35% solid filler. The self-made adhesive resin can prevent the module from falling off at room temperature, and can be hardened after lamination to support the module and prevent it from being knocked. The pressure-sensitive adhesive resin is used for adhesion and fixation before lamination; the epoxy resin and the curing agent are used for hardening the frame after lamination to prevent impact; the accelerator is used to promote the rapid reaction of the epoxy resin and the curing agent; and the solid filler is used to improve the strength of the frame.

[0007] The pressure-sensitive adhesive resin is one or more of an acrylic pressure-sensitive adhesive resin, a silicone pressure-sensitive adhesive resin, and a polyurethane pressure-sensitive adhesive resin.

[0008] The epoxy resin is one or more of an aliphatic modified epoxy resin, a bisphenol A epoxy resin, a polyurethane modified epoxy resin, a silicone modified epoxy resin, and a cycloaliphatic epoxy resin.

[0009] The latent curing agent is one or more of dicyandiamide, methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, and diaminodiphenyl sulfone.

[0010] The accelerator is one or more of 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-methylimidazole, and 2-undecylimidazole.

[0011] The solid filler is one or more of silicon dioxide, titanium white, aluminum oxide, carbon black, and aluminum hydroxide.

[0012] A preparation method of an integrated laminated lightweight frame for a photovoltaic module, comprising the following steps: Infiltration coating: the glass fiber cloth is uniformly coated with the self-made adhesive resin by a high-precision roller coater, and the coating thickness is controlled to be 0.5-0.6 mm; Pre-drying: pre-drying at 90 DEG C for 8 minutes to form a semi-cured adhesive film; Compounding: compounding with the upper and lower release films to prevent adhesion; Cutting: cutting the adhesive film according to the size of the frame of the photovoltaic module; Laminating and curing: the cut semi-cured adhesive film is pasted to the edge of the photovoltaic module, and the module is simultaneously placed into a laminating machine for synchronous curing at 140-160 DEG C under vacuum for 30 minutes, to complete the laminating and synchronous curing of the frame and the module.

[0013] Beneficial effects: the application provides an integrated laminated lightweight frame for a photovoltaic module and a preparation method thereof, which uses glass fiber cloth as the reinforcing and reinforcing main body, and is prepared through the processes of infiltration of a self-made adhesive resin, heat treatment and pre-drying, and cutting, to form a semi-cured adhesive film with certain adhesion at room temperature, facilitating installation and bonding before laminating, and then pasting the product to the frame of the module, and through synchronous curing of the module, the effect of integrated molding is achieved; the frame prepared by the application has a density of ≤1.8 g / cm 3The weight of the frame is reduced by more than 50% than that of a conventional aluminum frame; the adhesive film made of the self-made adhesive resin is fixed by using pressure-sensitive adhesive, after laminating and heating, the epoxy resin and the latent curing agent are subjected to ring-opening reaction, at this time, the epoxy resin and the assembly form adhesive force, structural adhesion is formed, and after curing, high-temperature resistance is achieved, so that the adhesive film loses adhesion. The preparation method is simple, the installation efficiency is improved, the separate frame curing and gluing process is omitted, and the production efficiency is improved by more than 20%; through synchronous curing by laminating, the interfacial shear strength of the frame and the assembly is improved, and the aging failure problem of the traditional adhesive is avoided; the edge sealing tape of the assembly is omitted, and the production cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A structure diagram of the adhesive film prepared in the embodiment of the application is shown. DETAILED DESCRIPTION

[0015] The application will be described in detail below in combination with the drawings and specific embodiments: The raw materials used below have no special description and can be obtained through commercial channels. Embodiment 1

[0016] The preparation method of the adhesive film is shown in the following steps: Figure 1 Infiltration coating: the glass fiber cloth is uniformly coated with the self-made adhesive resin by a high-precision roller coater, and the coating thickness is controlled to be 0.5-0.6 mm; Pre-drying: pre-drying at 90°C for 8 minutes to form a semi-cured adhesive film; Compounding: compounding with the upper and lower release films to prevent adhesion; Cutting: cutting the adhesive film according to the frame size of the photovoltaic assembly; Laminating and curing: the cut semi-cured adhesive film is pasted on the edge of the photovoltaic assembly, and the assembly is put into a laminating machine together, and synchronous curing is carried out under vacuum conditions at 140°C-160°C for 30 minutes, to complete the laminating and synchronous curing of the frame and the assembly.

[0017] The self-made adhesive resin is composed of the following components in mass percentage: 20% acrylic pressure-sensitive adhesive resin, 52% silicone-modified epoxy resin, 5% dicyandiamide, 1% 2-methyl imidazole, 2% carbon black powder, and 20% aluminum oxide powder; the above-mentioned proportions are mixed and stirred uniformly to obtain the self-made adhesive resin. Embodiment 2

[0018] The preparation method of the adhesive film is shown in the following steps: Figure 1 Infiltration coating: the glass fiber cloth is uniformly coated with the self-made adhesive resin by a high-precision roller coater, and the coating thickness is controlled to be 0.5-0.6 mm; ​​Pre-drying: Pre-dry at 90℃ for 8 minutes to form a semi-cured adhesive film; Composite: The upper and lower parts are laminated using release film to prevent adhesion; Cutting: Cut the adhesive film according to the frame size of the photovoltaic module; Lamination and curing: The cut semi-cured adhesive film is pasted onto the edge of the photovoltaic module and enters the laminator together with the module. It is simultaneously cured for 30 minutes under vacuum conditions of 140℃-160℃ to complete the simultaneous lamination and curing of the frame and the module.

[0019] The homemade adhesive resin is composed of the following components by weight percentage: 20% silicone pressure-sensitive adhesive resin, 50% bisphenol A epoxy resin, 5% methyltetrahydrophthalic anhydride, 2% 2-ethyl-4-methylimidazolium, and 23% titanium dioxide; the components are mixed in the above proportions and stirred evenly to obtain the homemade adhesive resin. Example 3

[0020] like Figure 1 The method for preparing the adhesive film shown includes the following steps: Impregnation coating: The fiberglass cloth is uniformly coated with self-made adhesive resin through a high-precision roller coating machine, and the coating thickness is controlled at 0.5-0.6mm; Pre-drying: Pre-dry at 90℃ for 8 minutes to form a semi-cured adhesive film; Composite: The upper and lower parts are laminated using release film to prevent adhesion; Cutting: Cut the adhesive film according to the frame size of the photovoltaic module; Lamination and curing: The cut semi-cured adhesive film is pasted onto the edge of the photovoltaic module and enters the laminator together with the module. It is simultaneously cured for 30 minutes under vacuum conditions of 140℃-160℃ to complete the simultaneous lamination and curing of the frame and the module.

[0021] The homemade adhesive resin is composed of the following components by weight percentage: 25% polyurethane pressure-sensitive adhesive resin, 45% alicyclic epoxy resin, 10% hexahydrophthalic anhydride, 2% 1-cyanoethyl-2-methylimidazole, and 18% alumina powder; the components are mixed in the above proportions and stirred evenly to obtain the homemade adhesive resin.

[0022] The above description is merely a preferred embodiment of the present invention. It should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, all of which fall within the protection scope of the present invention.

Claims

1. A one-piece laminated lightweight frame for photovoltaic modules, characterized in that, The frame is a semi-cured adhesive film with adhesive properties at room temperature; the adhesive film is reinforced with fiberglass cloth and impregnated with a self-made adhesive resin.

2. The integrated laminated lightweight frame for photovoltaic modules according to claim 1, characterized in that, The self-made adhesive resin is composed of the following components by weight percentage: 20%-40% pressure-sensitive adhesive resin, 40%-60% epoxy resin, 2%-10% latent curing agent, 1%-5% accelerator, and 10%-40% solid filler.

3. The integrated laminated lightweight frame for photovoltaic modules according to claim 2, characterized in that, The pressure-sensitive adhesive resin is one or more of acrylic pressure-sensitive adhesive resin, silicone pressure-sensitive adhesive resin, and polyurethane pressure-sensitive adhesive resin.

4. The integrated laminated lightweight frame for photovoltaic modules according to claim 2, characterized in that, The epoxy resin is one or more of the following: aliphatic modified epoxy resin, bisphenol A epoxy resin, polyurethane modified epoxy resin, silicone modified epoxy resin, and alicyclic epoxy resin.

5. The integrated laminated lightweight frame for photovoltaic modules according to claim 2, characterized in that, The latent initiator is one or more of dicyandiamide, methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, and diaminodiphenyl sulfone.

6. The integrated laminated lightweight frame for photovoltaic modules according to claim 2, characterized in that, The accelerator is one or more of 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-methylimidazole, and 2-undecylimidazole.

7. The integrated laminated lightweight frame for photovoltaic modules according to claim 2, characterized in that, The solid filler is one or more of the following: silicon dioxide, titanium dioxide, alumina, carbon black, and aluminum hydroxide.

8. The method for preparing an integrally laminated lightweight frame for photovoltaic modules according to any one of claims 1-7, characterized in that, Includes the following steps: Impregnation coating: The glass fiber cloth is uniformly coated with the above-mentioned self-made adhesive resin through a high-precision roller coating machine; Pre-drying: Pre-drying forms a semi-cured adhesive film; Composite: The upper and lower parts are laminated using release film to prevent adhesion; Cutting: Cut the adhesive film according to the frame size of the photovoltaic module; Lamination and curing: The cut semi-cured adhesive film is pasted onto the edge of the photovoltaic module and enters the laminator together with the module. It is simultaneously cured for 30 minutes under vacuum conditions of 140-160℃ to complete the simultaneous lamination and curing of the frame and the module.

9. The method for preparing an integrated laminated lightweight frame for photovoltaic modules according to claim 8, characterized in that, The coating thickness should be controlled between 0.5 and 0.6 mm.

10. The method for preparing an integrally laminated lightweight frame for photovoltaic modules according to claim 8, characterized in that, The pre-drying temperature is 90℃ and the time is 8 minutes.

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