Photovoltaic module frame and method of manufacturing the same

Abstract

The embodiment of the present disclosure relates to the field of photovoltaic cells, and provides a photovoltaic module frame and a preparation method thereof, the preparation method comprising: weighing raw materials, the raw materials comprising reinforcing particles, isocyanate, polymer polyol and glass fiber yarn; adding the reinforcing particles into the isocyanate to stir and react to obtain premix, the premix comprising modified reinforcing particles, the modified reinforcing particles being polymer particles in which the reinforcing particles are capped by the isocyanate; mixing the premix with the polymer polyol and injecting into an extrusion die in which the glass fiber yarn is placed to complete curing, pulling out the formed pultruded profile from the outlet of the extrusion die through a traction device, and cutting the pultruded profile into long frames and short frames suitable for the size of the photovoltaic module; assembling the long frames and the short frames into the photovoltaic module frame through corner codes, and the photovoltaic module frame having dispersed modified reinforcing particles therein. The photovoltaic module frame and the preparation method thereof provided by the embodiment of the present disclosure are at least beneficial to improving the use performance of the photovoltaic module frame.

Description

Technical Field

[0001] This disclosure relates to the field of photovoltaic cells, and in particular to a photovoltaic module frame and its fabrication method. Background Technology

[0002] Solar energy is one of the most important clean and renewable energy sources. With the development of photovoltaic technology, the cost of photovoltaic power generation has approached that of thermal power. Due to its low investment, zero pollution, long lifespan, and short investment return cycle, photovoltaic power generation is becoming increasingly popular.

[0003] Solar photovoltaic (PV) modules are crucial devices for converting solar energy into electrical energy. PV frames are essential components for securing these modules, protecting them from corrosion and wind damage. The material requirements for PV frames include high strength, lightweight, aesthetic appeal, and low cost. Currently, commonly used materials for solar PV frame supports include aluminum alloy, galvanized steel, and composite materials. Aluminum alloy is the most widely used, but manufacturing aluminum alloy and galvanized steel frames requires significant metal resources, resulting in high costs. Therefore, composite material frames have enormous development potential. Summary of the Invention

[0004] This disclosure provides a photovoltaic module frame and its manufacturing method, which at least helps to improve the performance of the photovoltaic module frame.

[0005] According to some embodiments of this disclosure, one aspect of this disclosure provides a method for preparing a photovoltaic module frame, comprising: weighing raw materials, including reinforcing particles, isocyanate, polymer polyol, and glass fiber yarn; adding the reinforcing particles to the isocyanate and stirring to obtain a premix, the premix including modified reinforcing particles, the modified reinforcing particles being polymer particles whose reinforcing particles are capped by isocyanate; mixing the premix with the polymer polyol and injecting it into a pultrusion mold containing glass fiber yarn to complete curing; pulling out the formed pultruded profile from the pultrusion mold outlet using a traction device; cutting the pultruded profile into long and short frames suitable for the size of the photovoltaic module; assembling the long and short frames into a photovoltaic module frame using corner brackets, the photovoltaic module frame containing dispersed modified reinforcing particles.

[0006] In some embodiments, the reinforcing particles include polyphenylene oxide particles.

[0007] In some embodiments, the diameter of the reinforcing particles is 6–40 μm.

[0008] In some embodiments, the mass ratio of the raw materials is as follows: 1-3 parts of reinforcing particles, 5-10 parts of isocyanate, 10-20 parts of polymer polyol, and 70-80 parts of glass fiber yarn.

[0009] In some embodiments, the reaction conditions for adding reinforcing particles to isocyanate and stirring to obtain a premix are: stirring temperature of 20-25°C and stirring time of 0.5-1 hour.

[0010] In some embodiments, the process of mixing the premix with the polymer polyol and injecting it into a pultrusion mold containing glass fiber yarn to complete the curing process further includes: feeding the glass fiber yarn through a yarn feeding device, straightening the yarn through a yarn threading die, and guiding it into the pultrusion mold through a guiding device, while the premix and polymer polyol impregnate the glass fiber yarn.

[0011] In some embodiments, the raw materials further include: an auxiliary agent, which includes at least one of an antioxidant, an ultraviolet absorber, a light stabilizer, a water absorber, a wetting and dispersing agent, an antifoaming agent, or a release agent; before the premixed material is mixed with the polymer polyol and injected into a pultrusion mold containing glass fiber yarn to complete the curing, the method further includes: adding the auxiliary agent to the polymer polyol and stirring until uniform.

[0012] In some embodiments, the isocyanate includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoflurane diisocyanate, and dicyclohexylmethane-4,4'-diisocyanate; the polymer polyol includes at least one of polyether polyol and polyester polyol.

[0013] In some embodiments, the temperature range of the pultrusion die is 60–80°C; the traction rate of the traction device is 1.0–3.0 m / min.

[0014] According to some embodiments of this disclosure, another aspect of this disclosure also provides a photovoltaic module frame, comprising: a composite material containing 1 to 3 parts by weight of modified reinforcing particles, 5 to 10 parts by weight of isocyanate, 10 to 20 parts by weight of polymer polyol and 70 to 80 parts by weight of glass fiber yarn, wherein the end groups of the modified reinforcing particles are isocyanate, and the modified reinforcing particles are uniformly dispersed in the photovoltaic module frame.

[0015] The technical solution provided in this disclosure has at least the following advantages: by adding reinforcing particles to isocyanate, the isocyanate can react with the reinforcing particles to obtain a premix with modified reinforcing particles. The premix and polymer polyol are then injected into a pultrusion mold containing glass fiber yarn to react and cure, thereby obtaining a photovoltaic module frame with modified reinforcing particles uniformly dispersed inside. The reinforcing particles can have anti-corrosion, anti-aging, insulating, or flame-retardant properties. The dispersion of modified reinforcing particles in the photovoltaic module frame can help improve the anti-corrosion, anti-aging, insulating, or flame-retardant properties of the photovoltaic module frame. Furthermore, the dispersed reinforcing particles can appropriately disperse the stress on the photovoltaic module frame, thereby appropriately increasing the strength of the photovoltaic module frame. Furthermore, the modified reinforcing particles are polymer particles obtained by reacting the end groups of reinforcing particles with isocyanate. Because the reaction between the modified particles and isocyanate consumes some of the isocyanate, the amount of isocyanate used increases, leading to an increase in the isocyanate content in the resulting polyurethane composite material. Consequently, the R-value of the polyurethane composite material increases. When a polymer polyol with a higher hydroxyl value is selected, the proportion of isocyanate used increases, which can help increase the number of hard segments in the polyurethane composite material, thus resulting in higher strength after curing. Curing is achieved by mixing the premix with the polymer polyol and injecting it into a pultrusion mold containing glass fiber yarn. The pultruded profile is then pulled out from the mold outlet using a traction device. The pultruded profile is further cut into long and short frames suitable for the size of photovoltaic modules. These long and short frames are then assembled into photovoltaic module frames using corner brackets, allowing for the formation of photovoltaic module frames of different sizes to accommodate different photovoltaic modules, thus improving the diversity of photovoltaic module manufacturing. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A process flow diagram corresponding to the method for fabricating a photovoltaic module frame provided in one embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the structure of a photovoltaic module frame provided in another embodiment of this application. Detailed Implementation

[0019] As can be seen from the background technology, composite material frames have great development potential.

[0020] Because solar photovoltaic (PV) modules need to have an outdoor lifespan of approximately 25 years, their frames must possess excellent anti-oxidation and corrosion resistance. Currently, PV frames are primarily made of aluminum alloy. However, the PV industry is a renewable energy sector encouraged and supported by the government, yet the production of aluminum consumes a significant amount of electricity, contradicting the principles of energy conservation and environmental protection. The significance and potential of using new environmentally friendly materials to change the energy industry structure and drive transformation in the materials and energy sector are self-evident. However, PV module frames need to possess characteristics such as corrosion resistance, oxidation resistance, high strength and durability, high tensile strength, high fatigue value, and long service life to adapt to different environments. Therefore, the performance of polyurethane composite material frames still needs improvement.

[0021] According to some embodiments of this disclosure, one embodiment of this disclosure provides a method for preparing a photovoltaic module frame to improve the performance of the photovoltaic module frame.

[0022] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0023] Figure 1 This is a process flow diagram of the method for manufacturing a photovoltaic module frame according to an embodiment of this application. The photovoltaic module frame provided in this embodiment will be described in detail below with reference to the accompanying drawings:

[0024] Methods for manufacturing photovoltaic module frames include:

[0025] Step S1: Weigh the raw materials, which include reinforcing particles, isocyanate, polymer polyol and glass fiber yarn.

[0026] In some embodiments, the isocyanate includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoflurone diisocyanate, and dicyclohexylmethane-4,4'-diisocyanate.

[0027] In some embodiments, the polymeric polyol includes at least one of polyether polyol and polyester polyol.

[0028] For glass fiber yarn, the linear density can be 2400–4800 g / km, for example, 2400 g / km, 2450 g / km, 2500 g / km, 3000 g / km, 3500 g / km, 4500 g / km, 4600 g / km, or 4800 g / km (specifications 2400 TEX-4800 TEX, i.e., 2400–4800 grams per kilometer of glass fiber yarn); the diameter of the glass fiber can be 10–30 μm, for example, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 15 μm, 18.9 μm, or 30 μm. In some embodiments, whole strands of alkali-free glass fiber can be used, which facilitates traction during the manufacturing process.

[0029] In some embodiments, the reinforcing particles include polyphenylene ether particles.

[0030] It is understandable that isocyanates and polymeric polyols can react to form polyurethane composites. Reinforcing particles can modify these polyurethane composites to improve their performance. For example, polyphenylene ether particles have good flame-retardant properties; adding them to polyurethane composites can improve their flame retardancy, thereby enhancing the flame-retardant properties of the composite frame formed from the polyurethane composite.

[0031] This embodiment does not specifically limit the materials of isocyanate and polymer polyol, as long as the reaction between isocyanate and polymer polyol can produce a polyurethane composite material. For reinforcing particles, in some embodiments, the reinforcing particles can also be other particles with properties that increase polymer strength, corrosion resistance, aging resistance, insulation, or flame retardancy, thereby improving the performance of the polyurethane composite material.

[0032] In some embodiments, the raw materials may further include auxiliary agents, including at least one of antioxidants, ultraviolet absorbers, light stabilizers, water absorbers, wetting and dispersing agents, defoamers, or release agents. Before the premixed material is mixed with the polymer polyol and injected into a pultrusion mold containing glass fiber yarn to complete curing, the method further includes: adding the auxiliary agent to the polymer polyol and stirring until homogeneous.

[0033] Antioxidants, ultraviolet absorbers, and light stabilizers can make the prepared polyurethane composites less prone to yellowing and improve the mechanical properties of polyurethane composites when exposed to outdoor conditions for a long time.

[0034] In some embodiments, the antioxidant may be at least one of phenolic, phosphite, or ketone antioxidants.

[0035] In some embodiments, the ultraviolet absorber may be a ketone or triazole ultraviolet absorber.

[0036] In some embodiments, the light stabilizer may be an ester or phosphite light stabilizer.

[0037] The water absorbent ensures an anhydrous environment for the reaction between isocyanate and polymer polyol; the wetting and dispersing agent can repeatedly disperse the isocyanate and polymer polyol, thereby allowing them to react fully; the defoamer can prevent air bubbles from forming in the polyurethane composite material, which would reduce its strength; the release agent makes the molded polyurethane composite material easier to remove from the mold, preventing it from sticking to the mold and deforming upon removal.

[0038] In some embodiments, the absorbent includes one or more of oxazolidine absorbents, carbodiimide absorbents, or orthoformate triester absorbents.

[0039] In some embodiments, the wetting and dispersing agent includes acrylate polymeric dispersants, polyurethane or polyester polymeric dispersants, etc.

[0040] In some embodiments, defoamers include fluorinated defoamers.

[0041] In some embodiments, the release agent includes fatty acids, paraffin wax, glycerin, petrolatum, etc.

[0042] In some embodiments, the mass ratio of the raw materials is as follows: 1 to 3 parts of reinforcing particles (e.g., 1 part, 1.1 parts, 1.5 parts, 2 parts, 2.5 parts, 2.9 parts, or 3 parts), 5 to 10 parts of isocyanate (e.g., 5 parts, 5.1 parts, 6 parts, 7 parts, 7.4 parts, 8 parts, 9 parts, 9.7 parts, or 10 parts), 10 to 20 parts of polymer polyol (e.g., 10 parts, 10.5 parts, 12 parts, 15 parts, 16.7 parts, 19 parts, or 20 parts), and 70 to 80 parts of glass fiber yarn (e.g., 70 parts, 71.2 parts, 75 parts, 78 parts, 79.8 parts, or 80 parts).

[0043] Refer to the table below for the impact of different components of reinforcing particles on the strength of photovoltaic module frames.

[0044]

[0045] It is understandable that increasing the mass fraction of reinforcing particles increases the modification effect on the polyurethane composite material (e.g., Examples 1-2). However, excessive reinforcing particles in the polyurethane composite material can lead to agglomeration (e.g., Example 3), resulting in defects and a decrease in strength. Therefore, the mass fraction of reinforcing particles needs to be selected in conjunction with the mass fraction of polyurethane to avoid agglomeration caused by excessive reinforcing particles, thereby improving the performance of the polyurethane composite material while avoiding affecting its strength.

[0046] Step S2: Add the reinforcing particles to the isocyanate and stir to react to obtain a premix. The premix includes modified reinforcing particles, which are polymer particles whose reinforcing particles are capped by isocyanate.

[0047] The reinforcing particles react with isocyanate, thereby capping the end groups of the reinforcing particles with isocyanate to produce modified reinforcing particles. Taking polyphenylene ether particles as an example, the chemical reaction equation for the reaction between polyphenylene ether particles and isocyanate is as follows:

[0048]

[0049] Understandably, each polyphenylene ether (PPE) molecular chain includes two end groups located at the ends of the PPE. Therefore, each PPE needs to react with at least two isocyanates. Since the isocyanate is in excess, the remaining isocyanate can react with the polymeric polyol to produce a polyurethane composite material. Therefore, the mass fractions of PPE particles, polymeric polyol, and isocyanate need to meet appropriate conditions to ensure that the end groups of the PPE particles can fully react with the isocyanate, and that the remaining isocyanate can adequately meet the reaction requirements with the polymeric polyol.

[0050] In some embodiments, the diameter of the reinforcing particles is 6 to 40 μm. Specifically, the diameter of the reinforcing particles can be 6.5 μm, 8 μm, 10 μm, 15.7 μm, 20 μm, 28.5 μm, 39.9 μm, or 40 μm.

[0051] For example, refer to the table below for the effect of reinforcing particles of different diameters on the bending strength of photovoltaic module frames:

[0052]

[0053] The effects of reinforcing particles of different diameters on the bending strength of photovoltaic module frames show that the diameter of the reinforcing particles needs to meet certain conditions to ensure that the modified reinforcing particles produced after the reaction with isocyanate can be uniformly dispersed in the polyurethane composite material. A larger diameter of the reinforcing particles corresponds to a larger diameter of the modified reinforcing particles. Appropriately sized modified reinforcing particles dispersed in the final polyurethane composite material can appropriately increase its strength (e.g., in Examples 4-6). However, when the diameter of the modified reinforcing particles is too large (e.g., in Example 7), it may lead to defects in the polyurethane composite material, resulting in a decrease in its strength. Therefore, the diameter of the reinforcing particles needs to be selected based on the actual dimensions of the polyurethane composite material to improve its performance while avoiding excessively large modified reinforcing particles that could reduce its strength.

[0054] In some embodiments, the reaction conditions for adding reinforcing particles to isocyanate and stirring to obtain a premix are as follows: stirring temperature of 20-25°C (e.g., 20°C, 21°C, 22°C, 24.5°C or 25°C) and stirring time of 0.5-1 hour (e.g., 0.5 hours, 0.6 hours, 0.7 hours, 0.88 hours, 0.9 hours or 1 hour).

[0055] Understandably, at low stirring temperatures, the reinforcing particles and isocyanate may not react properly; at excessively high temperatures, other side reactions may occur. Therefore, the stirring temperature needs to be within an appropriate range to ensure sufficient reaction between the reinforcing particles and isocyanate, while avoiding excessively high temperatures that could produce other byproducts. Furthermore, shorter stirring times result in less time for the reinforcing particles and isocyanate to react, potentially leading to incomplete reaction; longer stirring times do not increase the degree of reaction but instead increase the overall process time, reducing the efficiency of photovoltaic module frame fabrication. Therefore, the stirring time must be sufficient to ensure adequate reaction between the reinforcing particles and isocyanate while improving the fabrication efficiency of the photovoltaic module frame.

[0056] Step S3: The premixed material and polymer polyol are mixed and injected into the pultrusion mold containing glass fiber yarn to complete the curing. The pultruded profile is pulled out from the pultrusion mold outlet by the traction device. The pultruded profile is then cut into long and short frames suitable for the size of photovoltaic modules.

[0057] In some embodiments, the temperature range of the pultrusion die is 60–80°C (e.g., 60°C, 62°C, 65°C, 70°C, 75.5°C, or 80°C); the traction rate of the traction device is 1.0–3.0 m / min (e.g., 1.0 m / min, 1.2 m / min, 1.5 m / min, 1.8 m / min, 2.0 m / min, 2.3 m / min, 2.55 m / min, 2.8 m / min, or 3.0 m / min).

[0058] It is understandable that the reaction between isocyanate and polymer polyol requires a specific temperature for curing. Too low a temperature hinders the curing of the polyurethane composite, while too high a temperature may lead to over-curing of the isocyanate and polymer polyol, thus negatively impacting the traction of the traction device. Therefore, the temperature of the pultrusion die needs to be selected within a certain range to meet the curing requirements of the isocyanate-polymer polyol reaction, while also facilitating the traction device's extraction of the formed pultruded profile from the die outlet. Furthermore, the traction rate of the traction device needs to be coordinated with the pultrusion die to ensure the pultruded profile is oriented along the pultrusion direction, thereby improving the orientation and strength of the pultruded profile.

[0059] By cutting pultruded profiles into long and short frames suitable for photovoltaic modules, the dimensions of the pultruded profiles can be matched with photovoltaic modules of different sizes.

[0060] In some embodiments, the process of mixing the premix with the polymer polyol and injecting it into the pultrusion die for curing further includes: feeding glass fiber yarn through a yarn feeding device, straightening the yarn through a yarn threading die, and guiding it into the pultrusion die through a guiding device; and impregnating the glass fiber yarn with the premix and polymer polyol. By impregnating the glass fiber yarn with the premix and polymer polyol, the resulting polyurethane composite material can have interlaced glass fiber yarns, thereby effectively preventing tearing of the pultruded profile along the longitudinal direction under pressure and improving the strength of the pultruded profile.

[0061] Refer to the table below for the effect of different fiberglass yarn compositions on the bending strength of photovoltaic module frames.

[0062]

[0063] Understandably, glass fiber yarn can increase the strength of polyurethane composites. However, when the glass fiber yarn content is too low (e.g., in Example 8), the glass fiber yarn is not interlaced in the polyurethane composite, thus the flexural strength is not effectively improved. When the glass fiber yarn content is too high (e.g., in Example 10), the glass fiber yarn dominates, which is not conducive to forming pultruded profiles based on polyurethane composites. Therefore, the glass fiber yarn content needs to be selected based on actual conditions to improve the strength of polyurethane composites while also facilitating the formation of pultruded profiles based on polyurethane composites.

[0064] Step S4: Assemble the long and short frames into a photovoltaic module frame using corner brackets. The photovoltaic module frame contains dispersed modified reinforcing particles. These dispersed modified reinforcing particles can possess anti-corrosion, anti-aging, insulating, or flame-retardant properties, thereby improving the anti-corrosion, anti-aging, insulating, or flame-retardant properties of the photovoltaic module frame. Furthermore, the dispersed modified reinforcing particles can distribute some of the stress that the photovoltaic module frame needs to bear, thus improving the strength of the photovoltaic module frame in use.

[0065] Refer to the table below for the changes in flame retardant performance of the photovoltaic module frame with and without reinforcing particles. It should be noted that this embodiment uses flame-retardant particles as an example of reinforcing particles, but this does not limit the type of reinforcing particles; they can also be particles with anti-corrosion, anti-aging, or insulating properties. In this embodiment, the flame retardant performance of the photovoltaic module frame was tested using the UL94HB standard.

[0066]

[0067] As shown in the table above, when the reinforcing particles are flame-retardant particles, the flame-retardant performance of the photovoltaic module frame after adding flame-retardant particles is significantly higher than that of the photovoltaic module frame without flame-retardant particles. Reinforcing particles with flame-retardant properties can increase the flame-retardant performance of the photovoltaic module frame.

[0068] The method for preparing a photovoltaic module frame provided in this disclosure involves adding reinforcing particles to isocyanate, which allows the isocyanate to react with the reinforcing particles to obtain a premix containing modified reinforcing particles. The premix and polymer polyol are then injected into a pultrusion mold containing glass fiber yarn to react and solidify, resulting in a photovoltaic module frame with uniformly dispersed modified reinforcing particles inside. The reinforcing particles may have anti-corrosion, anti-aging, insulating, or flame-retardant properties. The dispersion of the modified reinforcing particles in the photovoltaic module frame can improve the anti-corrosion, anti-aging, insulating, or flame-retardant properties of the photovoltaic module frame. Furthermore, the dispersed reinforcing particles can appropriately disperse the stress on the photovoltaic module frame, thereby appropriately increasing the strength of the photovoltaic module frame. Furthermore, the modified reinforcing particles are polymer particles obtained by reacting the end groups of reinforcing particles with isocyanate. Because the reaction between the modified particles and isocyanate consumes some of the isocyanate, the amount of isocyanate used increases, leading to an increase in the isocyanate content in the resulting polyurethane composite material. Consequently, the R-value of the polyurethane composite material increases. When a polymer polyol with a higher hydroxyl value is selected, the proportion of isocyanate used increases, which can help increase the number of hard segments in the polyurethane composite material, thus resulting in higher strength after curing. Curing is achieved by mixing the premix with the polymer polyol and injecting it into a pultrusion mold containing glass fiber yarn. The pultruded profile is then pulled out from the mold outlet using a traction device. The pultruded profile is further cut into long and short frames suitable for the size of photovoltaic modules. These long and short frames are then assembled into photovoltaic module frames using corner brackets, allowing for the formation of photovoltaic module frames of different sizes to accommodate different photovoltaic modules, thus improving the diversity of photovoltaic module manufacturing.

[0069] According to some embodiments of this disclosure, another embodiment provides a photovoltaic module frame that can at least improve the performance of the photovoltaic module frame. It should be noted that the parts that are the same as or corresponding to those in the above embodiments can be referred to the corresponding descriptions in the foregoing embodiments, and will not be described in detail below.

[0070] Figure 2 This is a schematic diagram of the structure of a photovoltaic module frame according to another embodiment of this application. The photovoltaic module frame provided in this embodiment will be described in detail below with reference to the accompanying drawings:

[0071] The photovoltaic module frame 100 comprises: a composite material consisting of 1 to 3 parts by weight of modified reinforcing particles, 5 to 10 parts by weight of isocyanate, 10 to 20 parts by weight of polymer polyol, and 70 to 80 parts by weight of glass fiber yarn 102, wherein the end groups of the modified reinforcing particles 101 are isocyanate, and the modified reinforcing particles 101 are uniformly dispersed in the photovoltaic module frame 100.

[0072] The modified reinforcing particles 101 dispersed within the photovoltaic module frame 100 can have anti-corrosion, anti-aging, insulation, or flame-retardant properties, thereby improving the anti-corrosion, anti-aging, insulation, or flame-retardant properties of the photovoltaic module frame 100. Furthermore, the modified reinforcing particles 101 dispersed within the photovoltaic module frame 100 can distribute some of the stress that the photovoltaic module frame 100 needs to bear, thereby improving the service strength of the photovoltaic module frame 100.

[0073] It should be noted that the cross-sectional shape of the photovoltaic module frame in the accompanying drawings provided in this embodiment does not constitute a limitation on the shape of the photovoltaic module frame in this embodiment. It can be understood that the shape of the photovoltaic module frame can be designed and modified according to the photovoltaic module to be matched.

[0074] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure.

Claims

1. A method for preparing a photovoltaic module frame, characterized in that, include: Weigh the raw materials, which include reinforcing particles, isocyanate, polymer polyol and glass fiber yarn; The reinforcing particles are added to the isocyanate and stirred to obtain a premix, wherein the premix includes modified reinforcing particles, which are polymer particles whose reinforcing particles are capped by the isocyanate. The premixed material and the polymer polyol are mixed and injected into a pultrusion mold containing the glass fiber yarn to complete the curing. The pultruded profile is pulled out from the exit of the pultrusion mold by a traction device. The pultruded profile is then cut into long and short frames suitable for the size of the photovoltaic module. The long and short frames are assembled into the photovoltaic module frame using corner brackets, and the photovoltaic module frame contains dispersed modified reinforcing particles.

2. The method for preparing a photovoltaic module frame according to claim 1, characterized in that, The reinforcing particles include polyphenylene ether particles.

3. The method for preparing a photovoltaic module frame according to claim 1, characterized in that, The diameter of the reinforcing particles is 6~40μm.

4. The method for preparing a photovoltaic module frame according to claim 1, characterized in that, The raw materials are formulated in the following proportions by weight: 1-3 parts of reinforcing particles, 5-10 parts of isocyanate, 10-20 parts of polymer polyol, and 70-80 parts of glass fiber yarn.

5. The method for preparing a photovoltaic module frame according to claim 1, characterized in that, The reaction conditions for adding the reinforcing particles to the isocyanate and stirring to obtain the premix are: stirring temperature of 20~25℃ and stirring time of 0.5~1 hour.

6. The method for preparing a photovoltaic module frame according to claim 1, characterized in that, The process of mixing the premix with the polymer polyol and injecting it into a pultrusion mold containing the glass fiber yarn to complete the curing process further includes: feeding the glass fiber yarn through a yarn feeding device, straightening the yarn through a yarn threading mold, and guiding it into the pultrusion mold through a guiding device, wherein the premix and the polymer polyol impregnate the glass fiber yarn.

7. The method for preparing a photovoltaic module frame according to claim 1, characterized in that, The raw materials also include: auxiliary agents, which include at least one of antioxidants, ultraviolet absorbers, light stabilizers, water absorbers, wetting and dispersing agents, defoamers, or release agents; Before the premixed material and the polymer polyol are mixed and injected into a pultrusion mold containing the glass fiber yarn to complete the curing, the method further includes: adding the auxiliary agent to the polymer polyol and stirring evenly.

8. The method for preparing a photovoltaic module frame according to claim 1, characterized in that, The isocyanate includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoflurane diisocyanate, and dicyclohexylmethane-4,4'-diisocyanate; the polymer polyol includes at least one of polyether polyol and polyester polyol.

9. The method for preparing a photovoltaic module frame according to claim 1, characterized in that, The temperature range of the extrusion die is 60~80℃; the traction speed of the traction device is 1.0~3.0m / min.

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