A recycled short-cut glass fiber reinforced thermal insulation composite board and a preparation method thereof

Abstract

This invention provides a recycled chopped glass fiber reinforced thermal insulation composite board and its preparation method. The recycled chopped glass fiber reinforced thermal insulation composite board includes: a core layer (1); and a pair of reinforcing panels (2) composited on opposite sides of the core layer (1); wherein, the core layer (1) is a closed-cell thermal insulation core layer; the reinforcing panels (2) are recycled glass fiber reinforced thermoplastic polymer composite boards made by hot pressing of the following components in parts by weight: 10-40 parts of chopped recycled glass fiber; 60-90 parts of thermoplastic polymer granules; and 0-10 parts of flame retardant. This invention provides a building thermal insulation composite material that has both thermal insulation capabilities and high mechanical strength such as compressive strength and seismic resistance, as well as good corrosion resistance and weather resistance, and can be used for a long time by dispersing modified recycled glass fiber in a large amount in a thermoplastic resin matrix.

Description

Technical Field

[0001] This application relates to the field of building materials technology, and in particular to a recycled chopped glass fiber reinforced thermal insulation composite board and its preparation method. Background Technology

[0002] Building insulation boards are key materials for achieving building energy conservation. Currently, there are many types of insulation boards available, but each has its drawbacks. For example, while graphite-polystyrene composite boards offer good insulation, their manufacturing process is complex and the material is prone to aging; metal composite insulation boards are durable but expensive; and rock wool insulation boards offer excellent fire resistance and insulation, but they are highly absorbent and may pose health risks during construction.

[0003] Currently, there are various methods for preparing composite materials, resulting in the production of various types of high-performance insulation board materials. For example, a molded inorganic modified graphite polystyrene composite insulation board (CN120309250A) reduces heat conduction through the reflective and flame-retardant properties of graphite, thereby reducing energy consumption. However, this method involves complex graphite modification processes, and the difference in heat absorption and expansion between graphite and resin can easily cause damage and degradation of the board. Aluminum alloy composite insulation board (CN222525579U) is suitable for highly corrosive environments and is easy to assemble, but the production cost of aluminum alloy boards is high, posing a cost problem for construction. Vertical fiber rock wool insulation board (CN222407510U) has excellent fire resistance and thermal insulation capabilities, but the inhalable particulate matter during construction can easily cause health problems, and rock wool has strong water absorption, which can easily lead to failure.

[0004] Lightweight and high-strength glass fiber possesses excellent corrosion resistance, low thermal conductivity, and high-temperature resistance, making it highly effective in thermal insulation building materials. The large-scale production of recycled glass fiber in the current fiber industry further enriches the sources of raw materials. For example, a weather-resistant waterproof insulation board and its preparation process (CN119825098A) uses alkali-resistant glass fiber mesh as a reinforcing layer, effectively improving crack resistance; a hot-pressed insulation board and its preparation method involve coating the surface of a glass fiber composite cloth with a mixture of resin, flame retardant, and other components, then hot-pressing it into a high-strength insulation board, characterized by excellent waterproofing and high mechanical properties; a high-temperature resistant insulation board containing fiber waste and its preparation method (CN120005349A) uses 5% glass fiber waste as an auxiliary material, mixed with a foaming agent and thermosetting resin to form an aerogel material, creating a porous insulation structure. All the patents mentioned above are for composite insulation materials reinforced with glass fiber. However, the first two technologies use glass fiber cloth as raw material and are produced through a layering process, which places high demands on the size and specifications of the fiber cloth raw material. Although the third technology uses glass fiber waste, it is only added as an auxiliary material in low quantities and fails to achieve the use of glass fiber with a large mass ratio. For recycled glass fiber with special surface characteristics and scattered monofilament distribution after recycling, reasonable processing methods and preparation processes are still needed to achieve large-scale use in specific applications, overcome the technical limitations of being an auxiliary material, and create higher added value. Summary of the Invention

[0005] The purpose of this invention is to provide a recycled chopped glass fiber reinforced thermal insulation composite board and its preparation method, aiming to solve the problems in the prior art where recycled chopped glass fiber is difficult to utilize in a high proportion and at a high value due to uneven dispersion and weak interfacial bonding, as well as the difficulty in balancing mechanical properties, thermal insulation effect, cost, and environmental benefits in existing thermal insulation composite boards. This invention provides a building thermal insulation composite material that combines thermal insulation capabilities with high mechanical strength such as compressive and seismic resistance, as well as good corrosion resistance and weather resistance, allowing for long-term use. High-volume, low-cost glass fiber reinforcement gives both inner and outer layers excellent mechanical properties and durability; the three-layer composite board design combines the thermal insulation core layer with the structural board to form an integrated, self-supporting thermal insulation board.

[0006] The technical solution provided by this invention is as follows:

[0007] A recycled chopped glass fiber reinforced thermal insulation composite board, comprising: A core layer 1; and a pair of reinforcing panels 2 composited on opposite sides of the core layer 1; Wherein, the core layer 1 is a closed-pore type heat-insulating core layer; The reinforced panel 2 is a recycled glass fiber reinforced thermoplastic polymer hot press board made by hot pressing a material comprising the following parts by mass: 10-40 parts of chopped recycled glass fiber; 60-90 parts of thermoplastic polymer granules; Flame retardant 0-10 parts.

[0008] The thermoplastic polymer granules are selected from one or more of polypropylene, polyamide, and ASA.

[0009] The core layer 1 is made of one or more of extruded polystyrene foam board, polyurethane foam board, and phenolic resin foam board. The thickness of the core layer 1 is 20-50 mm.

[0010] The flame retardant is one or more of magnesium hydroxide, melamine polyphosphate (MPP), and tributyl phosphate.

[0011] The chopped recycled glass fiber is a pretreated and modified chopped recycled glass fiber prepared by the following steps: 3-6 mm chopped recycled glass fiber is placed in a dispersant solution and mechanically stirred at 60-100 rpm for 30-60 minutes at room temperature. After dispersant treatment, the treated fiber is removed and rinsed with deionized water until the pH of the washing effluent is close to 6.5-7.5. The washed wet fiber is then immersed in a silane coupling agent solution and stirred continuously at 60-80°C for 30-60 minutes. The fiber treated with the silane coupling agent is removed from the silane coupling agent treatment solution and dried at 100-110°C (until its moisture content is below 0.5%) to obtain the pretreated and modified chopped recycled glass fiber.

[0012] The dispersant is selected from one or a combination of hexadecyltrimethylammonium bromide, acrylic acid, and octadecyltrimethylammonium chloride; And / or, the silane coupling agent is selected from at least one of γ-aminopropyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane.

[0013] Preferably, the dispersant is a composition of hexadecyltrimethylammonium bromide and acrylic acid, and the mass ratio of hexadecyltrimethylammonium bromide to acrylic acid is 3:1 to 5:1. The concentration of the dispersant solution used is 0.1-0.5 wt%.

[0014] The amount of composite dispersant used ensures that the recycled glass fiber is fully impregnated. In practical applications, the dispersant solution can be recycled as appropriate depending on the condition after treatment.

[0015] Preferably, the silane coupling agent is γ-aminopropyltriethoxysilane, and its usage is 0.5%-5% of the dry weight of the chopped recycled glass fiber.

[0016] The preparation method of the silane coupling agent solution is as follows: γ-aminopropyltriethoxysilane is dissolved in a 90-95% ethanol solution to prepare a silane coupling agent alcohol solution with a mass concentration of 10% to 20%, and the pH value of the alcohol solution is adjusted to 4.5-5.5 with acetic acid to activate the silane. The preparation method of recycled glass fiber reinforced thermoplastic polymer hot press plate includes the following steps: A. Pretreatment of chopped recycled glass fibers: 3-6 mm chopped recycled glass fibers are placed in a dispersant and mechanically stirred at 60-100 rpm for 30-60 minutes at room temperature. After dispersant treatment, the treated fibers are removed and rinsed with deionized water until the pH of the washing effluent is close to 6.5-7.5. The washed wet fibers are then immersed in a silane coupling agent solution and stirred continuously at 60-80°C for 30-60 minutes. The fibers treated with the silane coupling agent are then removed from the silane coupling agent treatment solution and dried at 100-110°C (until their moisture content is below 0.5%) to obtain the pretreated modified chopped recycled glass fibers. B. The pretreated chopped recycled glass fiber, thermoplastic polymer granules, and flame retardant are mixed and then extruded into mixed granules through a twin-screw extruder. C. After laying the mixed granules in the mold, press them into recycled glass fiber reinforced thermoplastic polymer hot press sheets. The pressing method is to place the obtained mixed granules in a flat vulcanizing machine and hot press them for 15-20 minutes at a pressure of 5-20MPa and a temperature of 180-200℃ to produce reinforced panel sheets with a thickness of 5-15mm.

[0017] Secondly, the present invention also provides a method for preparing the recycled chopped glass fiber reinforced thermal insulation composite board as described above, which includes the following steps: S1. The chopped recycled glass fibers are sequentially treated with a dispersant, washed, treated with a silane coupling agent, and dried to obtain pretreated chopped recycled glass fibers. S2. The pretreated modified chopped recycled glass fiber, thermoplastic polymer granules, and flame retardant are mixed and extruded (a twin-screw extruder can be used) to form mixed granules; the mixed granules are pressed into recycled glass fiber reinforced thermoplastic polymer hot press sheets (i.e., reinforced panel 2). S3. Using hot melt adhesive, a pair of the recycled glass fiber reinforced thermoplastic polymer hot press plates are hot-pressed together with a core layer 1 to obtain the thermal insulation composite board.

[0018] The selected hot melt adhesive is one or more of EVA, PUR, and EAA hot melt adhesive films.

[0019] S1 specifically involves: placing 3-6 mm chopped recycled glass fibers in a dispersant and mechanically stirring at 60-100 rpm for 30-60 minutes at room temperature. After dispersant treatment, the treated fibers are removed and rinsed with deionized water until the pH of the washing effluent is close to 6.5-7.5. The washed wet fibers are then immersed in a silane coupling agent solution and continuously stirred at 60-80°C for 30-60 minutes. The fibers treated with the silane coupling agent are then removed from the silane coupling agent treatment solution and dried at 100-110°C (until their moisture content is below 0.5%) to obtain the pretreated modified chopped recycled glass fibers.

[0020] B. Pretreated modified chopped recycled glass fiber, thermoplastic polymer granules, and flame retardant are mixed and then extruded into mixed granules using a twin-screw extruder. C. After laying the mixed granules in the mold, press them into recycled glass fiber reinforced thermoplastic polymer hot press sheets. The pressing method is to place the obtained mixed granules in a flat vulcanizing machine and hot press them for 15-20 minutes at a pressure of 5-20MPa and a temperature of 180-200℃ to produce sheets with a thickness of 5-15mm.

[0021] D. Composite board preparation: The thermal insulation composite board is obtained by hot-pressing a pair of recycled glass fiber reinforced thermoplastic polymer hot-pressed boards with a core layer 1 using hot melt adhesive.

[0022] Further, in step B, the weight ratio of pretreated chopped recycled glass fiber, thermoplastic polymer granules, and flame retardant is 10-40 parts: thermoplastic polymer granules 60-90 parts: flame retardant 0-10 parts.

[0023] The hot pressing conditions in step D are: 200-300 kPa pressure and 70-120℃ for 5-10 minutes to obtain a three-layer thermal insulation composite board.

[0024] The thermoplastic polymer granules are selected from one or more of polypropylene, polyamide, and ASA.

[0025] The core layer 1 is made of one or more of extruded polystyrene foam board, polyurethane foam board, and phenolic resin foam board. The thickness of the core layer 1 is 20-50 mm.

[0026] The flame retardant includes one or more of magnesium hydroxide, melamine polyphosphate (MPP), and tributyl phosphate.

[0027] The preferred silane coupling agent is KH570 (γ-methacryloyloxypropyltrimethoxysilane). Compared with the prior art, the present invention has the following beneficial effects: 1. A three-step pretreatment method—dispersant treatment, cleaning, and coupling agent treatment—synergistically solves the fundamental problems of easy agglomeration and poor interfacial bonding between recycled chopped glass fibers and the resin matrix. A specific ratio of composite dispersant (such as a combination of hexadecyltrimethylammonium bromide and acrylic acid at a mass ratio of 3:1 to 5:1) is used to effectively dissolve fiber entanglement through electrostatic repulsion and steric hindrance. Subsequent treatment with an aminosilane coupling agent (such as KH570) forms chemical bonds on the fiber surface and enhances compatibility with the resin. This process enables recycled glass fibers to be stably and uniformly dispersed in thermoplastic resin at a high proportion (20-40 parts by mass), significantly improving the mechanical properties of the composite board and overcoming the limitation that recycled fibers can only be used as low-dosage fillers.

[0028] 2. The final sandwich-structured composite panel features a core layer (such as XPS board) that provides excellent thermal insulation, while a thermoplastic surface layer reinforced with a high proportion of recycled glass fiber imparts high strength, corrosion resistance, and waterproofing. The entire panel is encapsulated through hot-pressing, significantly improving its impermeability, weather resistance, and structural durability. Its expected service life is over 15 years, making it particularly suitable for building exterior walls and other applications requiring both insulation and durability.

[0029] 3. This invention has relatively relaxed requirements on the source and size of recycled glass fiber (such as scraps, waste fabric, etc.). It only needs to be cut to 3-6mm to achieve high-value utilization through pretreatment, reducing raw material costs and processing barriers, and providing a market-competitive technical path for large-scale disposal of glass fiber waste. At the same time, both the thermoplastic resin and the recycled glass fiber used are recyclable, realizing a green and low-carbon cycle throughout the product's entire life cycle, with significant environmental and economic benefits. Attached Figure Description

[0030] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the thermal insulation composite panel structure. Figure 2 This is a morphology diagram of the short-cut fibers in Example 1. Detailed Implementation

[0031] The present invention will be described in detail below with reference to embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several adjustments and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0032] Figure 1A schematic diagram of the structure of the recycled chopped glass fiber reinforced thermal insulation composite panel of the present invention is shown. This composite panel exhibits a typical three-layer sandwich structure, specifically comprising: A core layer 1; and A pair of reinforcing panels 2 are composited on opposite sides of the core layer 1.

[0033] The reinforced panel 2 primarily provides structural rigidity, mechanical support, and impact resistance, as well as protection against external environmental factors such as moisture, chemical corrosion, and ultraviolet radiation; while the core layer in the middle mainly undertakes the core function of thermal insulation.

[0034] Example 1 This embodiment provides a recycled chopped glass fiber reinforced thermal insulation composite board and its preparation method.

[0035] In this embodiment, the core layer is a closed-cell insulation core layer. Specifically, the core layer can be commercially available extruded polystyrene foam board (the thickness of the extruded polystyrene foam board is set to 30 mm), which has a uniform and dense closed-cell structure. The pores are filled with still air or other gases with low thermal conductivity, which can effectively hinder the convection and conduction of heat, giving the composite board excellent thermal insulation performance.

[0036] The preparation method of the recycled chopped glass fiber reinforced thermal insulation composite board includes the following steps: 1. Surface modification treatment of glass fiber: Collected fiberglass waste, such as scraps from fiberglass product manufacturing or waste fiberglass cloth, is cut using industrial shearing equipment to obtain chopped recycled fiberglass of uniform length. In this embodiment, the fiber cutting length is preferably controlled at 3 mm (morphological diagram as shown). Figure 2 ).

[0037] Preparation of composite dispersant solution: Hexadecyltrimethylammonium bromide and acrylic acid are mixed at a mass ratio of 4:1 to form a powdered composite dispersant. The composite dispersant is dissolved in water to a concentration of 0.2% wt. Short-cut recycled glass fibers with a length of 3 mm were added to a composite dispersant solution (the mass-to-volume ratio of recycled glass fiber (dry weight) to dispersant solution (g / mL) was 1:5 to 1:20. In practical use, the amount of composite dispersant ensures that the recycled glass fiber is fully wetted. In actual application, the dispersant solution is recycled as appropriate depending on the condition after treatment. In this embodiment, a ratio of 1:10 is used). The solution was mechanically stirred at 60 rpm for 30 minutes at room temperature (approximately 25°C). During this process, dispersant molecules adsorbed onto the surface of the short-cut recycled glass fibers. The hydrophobic ends of the long carbon chains of hexadecyltrimethylammonium bromide adsorbed onto the fiber surface, while the positively charged hydrophilic ends faced the aqueous solution, preventing the fibers from approaching each other through electrostatic repulsion. At the same time, acrylic acid molecules could also form adsorption on the fiber surface, and the steric hindrance effect provided by its carboxyl groups further enhanced the dispersion effect. After the dispersant treatment, a washing step is performed. The treated fibers are removed and rinsed repeatedly with plenty of deionized water until the pH of the effluent is close to neutral (6.5-7.5). This step aims to remove excess and loosely adsorbed dispersant molecules from the fiber surface to avoid adverse effects on subsequent coupling agent treatment and bonding with the resin matrix.

[0038] KH570 modification (γ-methacryloyloxypropyltrimethoxysilane) uses KH570 as the coupling agent, at a dosage of 3% of the dry weight of the chopped recycled glass fibers to be treated. The coupling agent is dissolved in a 95% aqueous ethanol solution to prepare a 10% (w / w) coupling agent alcohol solution. The pH is adjusted to 4.5-5.5 with acetic acid to activate the silane. The cleaned wet fibers are then immersed in this coupling agent alcohol solution and continuously stirred in a 60°C water bath for 60 minutes. The fibers treated with the silane coupling agent are removed from the treatment solution and dried at 110°C for 4 hours until their moisture content is below 0.5%. It should be noted that the drying step not only removes moisture to prevent defects such as bubbles caused by moisture evaporation during subsequent high-temperature processing, but also promotes a more complete condensation reaction between the silane coupling agent and the fiber surface at high temperatures.

[0039] 2. Enhanced panel fabrication Modified glass fiber and polypropylene granules (EP300H) were mixed at a mass ratio of 1:9 and then extruded into mixed granules using a twin-screw extruder. The resulting mixed granules were placed in a flat vulcanizing machine and hot-pressed at 5 MPa pressure and 200°C for 15 minutes to produce a reinforced panel sheet with a thickness of 10 mm.

[0040] 3. Composite panel forming The following layers are laid out in a flat vulcanizing machine: reinforced panel material - EVA hot melt adhesive film - 30mm thick polystyrene foam board (core layer) - EVA hot melt adhesive film - reinforced panel material. The layers are then hot-pressed at 300kPa pressure and 75℃ for 5 minutes to obtain a three-layer thermal insulation composite board.

[0041] Example 2 The difference between this embodiment and Embodiment 1 is that: In step 2, the modified glass fiber and polypropylene granules are mixed in a ratio of 3:7, and the remaining raw materials, processing technology and composite process are the same as in Example 1.

[0042] Example 3 The difference between this embodiment and Embodiment 2 is as follows: The polypropylene granules were replaced with an equal mass of PA66 polyamide granules, and the remaining raw materials, processing technology and compounding process were the same as in Example 2.

[0043] Comparative Example 1 The difference between this comparative example and Example 2 is as follows: The composite dispersant solution uses only 0.2% wt of cetyltrimethylammonium bromide.

[0044] Comparative Example 2 The difference between this comparative example and Example 2 is as follows: The composite dispersant solution uses only 0.5% wt of acrylic acid.

[0045] Comparative Example 3 The difference between this comparative example and Example 2 is as follows: The composite dispersant solution was replaced with sodium dodecyl sulfate (SDS).

[0046] Comparative Example 4 The difference between this comparative example and Example 2 is as follows: In the composite dispersant solution, acrylic acid is replaced with maleic acid.

[0047] Comparative Example 5 The difference between this embodiment and Embodiment 2 is that the recycled glass fiber was not modified with KH570. That is, the coupling agent modification step in step 1, the recycled glass fiber treatment step, is removed. Short recycled glass fibers with a length of 3 mm are put into a composite dispersant solution (the mass ratio of recycled glass fiber to dispersant solution is 1:100), and mechanically stirred at 60 rpm for 30 minutes at room temperature (about 25°C). After washing and drying, the process is directly carried out in step 2 to prepare the reinforced panel.

[0048] The remaining raw materials, processing technology and compounding process are the same as in Example 2.

[0049] Performance testing Mechanical properties were tested on samples taken from each of the above embodiments and comparative examples.

[0050] Test method: Notched impact test (GB / T-1843-2008) and tensile property test (GB / T 1447-2005) were performed. The thermal conductivity of the short-cut recycled glass fiber reinforced board layer in the examples was tested (GB / T 10295-2008). The test results for each example are as follows: Table 1

[0051] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A recycled chopped glass fiber reinforced thermal insulation composite board, characterized in that, include: A core layer (1); and a pair of reinforcing panels (2) composited on opposite sides of the core layer (1); Wherein, the core layer (1) is a closed-pore type heat-insulating core layer; The reinforced panel (2) is a recycled glass fiber reinforced thermoplastic polymer hot press board made by hot pressing of a substance comprising the following mass parts: 10-40 parts of chopped recycled glass fiber; 60-90 parts of thermoplastic polymer granules; Flame retardant 0-10 parts.

2. The composite board according to claim 1, characterized in that, The thermoplastic polymer granules are selected from one or more of polypropylene, polyamide, and ASA.

3. The composite board according to claim 1, characterized in that, The material of the core layer (1) is selected from one or more of extruded polystyrene foam board, polyurethane foam board, and phenolic resin foam board; And / or, the thickness of the core layer (1) is 20-50 mm; And / or, the flame retardant is one or more of magnesium hydroxide, melamine polyphosphate, and tributyl phosphate.

4. The composite board according to claim 1, characterized in that, The chopped recycled glass fibers are chopped recycled glass fibers with a length of 3-6 mm, and the chopped recycled glass fibers are pretreated and modified by a method including the following steps: The chopped recycled glass fibers are placed in a dispersant solution and mechanically stirred at 60-100 rpm for 30-60 minutes at room temperature. After the dispersant treatment is completed, the treated fibers are taken out and rinsed with water until the pH of the washing effluent is close to 6.5-7.

5. The washed wet fibers are then immersed in a silane coupling agent solution and stirred continuously at 60-80°C for 30-60 minutes. The fibers treated with the silane coupling agent are removed from the silane coupling agent treatment solution and dried at 100-110°C to obtain the pretreated modified chopped recycled glass fibers.

5. The composite board according to claim 4, characterized in that, The dispersant is selected from one or a combination of hexadecyltrimethylammonium bromide, acrylic acid, and octadecyltrimethylammonium chloride; And / or, the silane coupling agent is selected from at least one of γ-aminopropyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane.

6. The composite board according to claim 4, characterized in that, The preparation method of recycled glass fiber reinforced thermoplastic polymer hot press plate is as follows: Pretreated modified chopped recycled glass fiber, thermoplastic polymer granules, and flame retardant are mixed and then extruded into mixed granules using a twin-screw extruder. After laying the mixed granules in the mold, they are pressed into recycled glass fiber reinforced thermoplastic polymer hot press sheets; pressing reference: 5-20MPa pressure, 180-200℃ for 15-20 minutes to produce reinforced panel sheets with a thickness of 5-15mm.

7. A method for preparing a recycled chopped glass fiber reinforced thermal insulation composite board as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. The chopped recycled glass fibers are sequentially treated with a dispersant, washed, treated with a silane coupling agent, and dried to obtain pretreated chopped recycled glass fibers. S2. Pretreated modified chopped recycled glass fiber, thermoplastic polymer granules, and flame retardant are mixed and extruded to form mixed granules; the mixed granules are pressed into recycled glass fiber reinforced thermoplastic polymer hot press plates. S3. Using hot melt adhesive, a pair of the recycled glass fiber reinforced thermoplastic polymer hot press plates and a core layer (1) are hot-pressed together to form the thermal insulation composite plate.

8. The preparation method according to claim 7, characterized in that, In step S2, the weight ratio of pretreated modified chopped recycled glass fiber, thermoplastic polymer granules, and flame retardant is 10-40 parts: 60-90 parts of thermoplastic polymer granules: 0-10 parts of flame retardant.

9. The preparation method according to claim 7, characterized in that, In step S2, the step of pressing the mixed granules into a recycled glass fiber reinforced thermoplastic polymer hot press plate is as follows: after laying the mixed granules in the mold, it is pressed into a recycled glass fiber reinforced thermoplastic polymer hot press plate; pressing parameters: 5-20MPa pressure, hot pressing at 180-200℃ for 15-20 minutes to produce a plate with a thickness of 5-15mm.

10. The preparation method according to claim 7, characterized in that, The hot melt adhesive is one or more of EVA, PUR, and EAA hot melt adhesive films.

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