Method for manufacturing recyclable building angle and plate from recycled thermoplastic polymer composite material

Abstract

This invention provides a method for manufacturing recyclable building corner pieces and panels from recycled thermoplastic polymer composite materials. The method uses at least 70% recycled polystyrene (rPS) as the base material, and adds appropriate amounts of compatible modified elastic plastics, foaming agents, and functional additives to form a mixed material. The mixed material is then heated and stirred using a screw extruder to become a thermoplastic polymer composite copolymer mixture. Finally, the thermoplastic polymer composite copolymer mixture is gradually cooled and shaped to room temperature using a cooling mold to produce integrally molded and recyclable building corner pieces and panels.

Description

Technical Field

[0001] This invention relates to a method for manufacturing corner pieces and panels for building applications, and in particular to a method for manufacturing recyclable corner pieces and panels for building applications using recycled thermoplastic polymer composite materials. Background Technology

[0002] Currently, the use of recycled plastics in building corners and panels generally faces the disadvantages of unstable material quality and material weakening. In addition, the source of recycled plastics and the process and additives are unknown, which makes them susceptible to degradation, long-term oxidation due to temperature and humidity in the environment, and breakage during recycling. As a result, the recycling of plastics cannot be achieved and can only be used at a lower level or added in small amounts, about 30% or less.

[0003] For example, in the manufacturing of existing WPC wood-plastic composite boards, the main process involves mixing 70% new materials and 30% recycled plastics, which together account for 50% of the total. Then, fillers such as wood flour or stone powder are added, accounting for 40% of the total, and elastomers are added, accounting for 10% of the total. The overall material compatibility of this process is still generally insufficient. Furthermore, in the recycling and crushing processes, the insufficient bonding of crushed particles not only results in low process yield, but the high proportion of fillers also makes it impossible to recycle.

[0004] Furthermore, the specific gravity of traditional wood-plastic composite boards is 1.3 g / cm³. 3 The use of recycled plastics in building corner pieces and panels is currently limited by several drawbacks. These include insufficient weight, excessive hardness of pure PETG sheets, insufficient impact resistance and brittleness of pure PS sheets, and insufficient rigidity of PP / Pe sheets, which, despite their impact resistance, lack of weather resistance, aging, thermal expansion and contraction leading to cracking, and a monotonous surface texture. Furthermore, the use of recycled plastics in building corner pieces and panels generally suffers from insufficient lightweighting, inadequate surface anti-slip and self-cleaning properties, and structural issues such as insufficient pull-out force of screws and bolts, inadequate overall mechanical strength, wind resistance, earthquake resistance, and joint toughness. Therefore, these materials are unsuitable for building construction and there is still room for improvement.

[0005] For example, Taiwan's Patent No. I674296 provides a high-strength, environmentally friendly wood-plastic composite material and its manufacturing method, which uses pulverized fabric as a filler and combines it with polyethylene terephthalate, a modifier, and a compatibilizer. However, after prolonged use and wear, the inner fabric of this wood-plastic composite material will be exposed to the outside. Because the fabric absorbs dirt and moisture, it is prone to bacterial growth, which is detrimental to environmental hygiene. Furthermore, the presence of fabric in this wood-plastic composite material makes its recycling process more complicated, significantly increasing the cost of reuse.

[0006] Therefore, how to improve the above-mentioned problems is the primary issue that this invention aims to solve. Summary of the Invention

[0007] The main objective of this invention is to provide a method for manufacturing recyclable building corner pieces and panels from recycled thermoplastic polymer composite materials. This method effectively removes more than 70% of the polystyrene (rPS) recycled plastic, preventing accumulation and pollution. The resulting building corner pieces and panels are lightweight, have excellent surface anti-slip and self-cleaning properties, and ensure that their rigidity, toughness, and impact resistance meet the requirements of building material construction. Furthermore, the resulting building corner pieces and panels can be 100% recycled and reused after crushing, achieving the requirements of a circular economy.

[0008] To achieve the aforementioned objectives, the present invention provides a method for manufacturing recyclable building corner pieces and panels from recycled thermoplastic polymer composite materials, comprising the following steps:

[0009] a. Material preparation steps: Using recycled polystyrene (rPS) as the base material, and adding a certain proportion of compatible modified elastic plastic, foaming agent to make the base material lightweight, and other functional additives, the mixture is then mixed together in a mixer to form a composite material. The recycled polystyrene (rPS) accounts for 70% to 80% of the total content of the composite material, the compatible modified elastic plastic accounts for 10% to 20% of the total content of the composite material, and the foaming agent and other functional additives are controlled to be within 10% of the total content of the composite material.

[0010] b. Heating and extrusion step: The mixed material is fed into a screw extruder. After being heated by the screw extruder and stirred and divided by the screw, the mixed material becomes a thermoplastic polymer composite copolymer mixture.

[0011] c. Cooling and molding step: The thermoplastic polymer composite copolymer mixture extruded by the screw extruder is conveyed to a cooling mold. The cooling gradient of the cooling mold is controlled by circulating water flow from 150°C to 40°C, so that the thermoplastic polymer composite copolymer mixture is gradually cooled and shaped to room temperature and matured, and can be made into one-piece molded and recyclable building corner pieces and panels.

[0012] Preferably, the screw extruder consists of a single screw extruder with a compression ratio of 2 to 4 times, and the extruder heating temperature is controlled between 120°C and 200°C, while the extruder screw speed is controlled between 15 and 45 rpm for heating and extrusion operation.

[0013] Preferably, the compatibility modified elastic plastic is composed of at least one thermoplastic polymer material, such as TPU, TPO, TPV, TPS, TPR, NR, IR, SBR, BR, CR, IIR, NBR, or EPDM.

[0014] Preferably, the foaming agent is an AC azo-type chemical foaming agent, and the dosage of the foaming agent is adjusted between 0.1% and 3%. The extruder heating temperature is set within the range of 150℃ ± 30℃, and the cooling mold has a cooling gradient of 150℃ to 40℃ to control the foam density at 0.4 g / cm³. 3 ~1g / cm 3 between.

[0015] Preferably, other functional additives may consist of, for example, colorants, dispersants, stabilizers or fillers.

[0016] Preferably, during the mixing process of the materials in the mixer, a drying operation is carried out simultaneously under the conditions of drying temperature 80°C and drying for 2 hours.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention provides a method for manufacturing recyclable building corner pieces and panels from recycled thermoplastic polymer composite materials. It can effectively remove more than 70% of the polystyrene (rPS) recycled plastic, avoiding pollution caused by accumulation. The resulting building corner pieces and panels are lightweight, have excellent surface anti-slip and self-cleaning properties, and ensure that their rigidity, toughness, and impact resistance meet the requirements of building material construction. Furthermore, the resulting building corner pieces and panels can be 100% recycled and reused after crushing, achieving the requirements of a circular economy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the manufacturing process of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the building corner and panel manufactured according to the present invention.

[0021] Figure 3 These are photographs of actual building corner pieces and panels manufactured according to the present invention.

[0022] Figure Labels

[0023] 10: Building material body; 11: Surface layer; 12: Mesh fiber stacked layer; 13: Support filling layer. Detailed Implementation

[0024] The above-mentioned objects and advantages of the present invention will be readily apparent from the following detailed description and accompanying drawings of the selected embodiments.

[0025] Please refer to the following first. Figure 1 The method shown in the figure is for manufacturing recyclable building corner pieces and panels from recycled thermoplastic polymer composite materials, which mainly includes the following steps:

[0026] a. Material preparation steps: Recycled polystyrene (rPS) of thermoplastic polymer is used as the base material, and a certain proportion of compatibility modified elastic plastic, foaming agent to make the base material lightweight and other functional additives are added. Then, they are mixed together by a mixer to form a mixed material. In this embodiment, recycled polystyrene (rPS) accounts for 70% to 80% of the total content of the mixed material, compatibility modified elastic plastic accounts for 10% to 20% of the total content of the mixed material, and the foaming agent and other functional additives (such as color powder, dispersant, stabilizer or other filler) are controlled to be within 10% of the total content of the mixed material. Among them, compatibility-modified elastic plastics are also composed of thermoplastic polymers. They have the characteristics of softening when heated and hardening when cooled, and can be reused. By adding 10% to 20% compatibility-modified elastic plastics before the molding material hardens, the rigidity, hardness, and brittleness of the molding material after cooling, and the toughness, softness, impact resistance, and other properties of the molding material after heating can be adjusted. Compatibility-modified elastic plastics can be composed of at least one thermoplastic polymer material, such as TPE thermoplastic elastomers (e.g., TPU (thermoplastic polyurethane) / TPO (polyolefin elastomer) / TPV (dynamically vulcanized polyolefin elastomer) / TPS or TPR, etc.) or rubber (e.g., NR / IR / SBR / BR / CR / IIR / NBR / EPDM, etc.). Its rigid segments mainly affect the elasticity, low temperature performance, hardness, tear strength, modulus, etc. of building materials, while the flexible segments mainly produce chemical crosslinking and physical crosslinking, thereby improving the bonding between different materials. Furthermore, given that the processing and additives of the obtained recycled polystyrene (rPS) are unknown, the recycled granules generally suffer from unstable material quality (such as injection-grade / extrusion-grade / foaming-grade, unknown additives from indoor and outdoor environments, etc.), resulting in material weakening. In addition, the recycled granules are affected by long-term oxidation, degradation, and the crushing process during recycling due to environmental temperature and humidity. Therefore, this invention can further adjust the physical properties of recycled polystyrene (rPS) (i.e., conditioning) by adding compatible modified elastic plastics. Taking the use of recycled polystyrene (rPS) as the base material in this invention as an example, the proportion of compatible modified elastic plastics, foaming agents, and other functional additives is... By controlling the content to within 30%, good physical property recovery and mechanical stability can be achieved, which is different from the traditional conditioning method of adding 30% old material to 70% new material or directly adding toughening agent. At the same time, it can also ensure that it can easily enter the second, third or more cycles of manufacturing in the subsequent repeated recycling and remanufacturing process. The foaming agent of the present invention can be selected as AC azo chemical foaming agent according to the process requirements, and the dosage of foaming agent can be adjusted between approximately 0.1% and 3%. Other functional additives can be composed of 1% to 3% color powder, 1% to 2% white oil (adjusted according to the amount of powder), 1% stabilizer, 1% dispersant, and 1% to 5% filler.

[0027] Furthermore, this invention allows the addition of 1% to 5% filler. This filler is unrelated to the process material and can be added unintentionally or intentionally. The main reason is that the purity of the recycled material is not 100%. It can be composed of organic wood flour or inorganic stone powder, dust or powder, other recycled plastic monomers such as recycled polyethylene (rPE), recycled polypropylene (rPP), recycled polycarbonate (rPC), or recycled acrylonitrile-butadiene-styrene copolymer (rABS), etc. Of course, it also includes factory scraps and dust materials.

[0028] Furthermore, the preparation of the mixed material raw materials composed of the above-mentioned components faces factors such as the different forms of granules, liquids, and powders, as well as the different particle sizes. It is necessary to carry out the mixing and stirring behavior according to the material ratio and production volume, while simultaneously drying and removing water vapor to avoid the generation of large air bubbles in the core layer of the building material. Taking the recycled polystyrene (rPS) as the base material in this invention as an example, a drying operation with a drying temperature of 80°C and a drying time of 2 hours must be carried out simultaneously during the mixing process of the materials in the mixer. The drying of all added materials and their uniform dispersion are one of the key points of the material manufacturing process.

[0029] b. Heating and Extrusion Step: The mixed material after the above-mentioned component mixing is fed into a screw extruder equipped with heating and stirring functions for heating and stirring. The mixture becomes a thermoplastic polymer composite copolymer mixture after being heated and stirred by the screw extruder. In this embodiment, the screw extruder is a single-screw extruder with a screw length-to-diameter ratio of 1:28 or 1:30, achieving a compression ratio of 2 to 4 times. The extruder heating temperature is controlled between 120°C and 200°C, and the operating speed can be controlled between 15 and 45 rpm according to the production capacity and density requirements. This allows the internal thermoplastic polymer composite copolymer mixture to be disturbed and dispersed by the screw movement, achieving ideal stress requirements through sufficient inter-molecular mixing and cohesion. This is achieved through effective control of intermolecular temperature, flow rate, viscosity, and density. By controlling the backpressure after passing through a honeycomb filter, a uniform output distribution can be achieved. Simultaneously, by controlling the extruder heating temperature, the foaming agent in the mixture also begins to foam. Foaming technology can be divided into physical and chemical foaming technologies, and further classified as inorganic and organic foaming. In this embodiment, chemical foaming technology is used, which can be further categorized into low-temperature, high-temperature, micro-foaming, medium-foaming, and high-foaming types suitable for different temperature levels. This invention uses a thermoplastic polymer composite copolymer mainly composed of recycled polystyrene (rPS) and compatible modified elastic plastics. The foaming agent is an AC azo-type chemical foaming agent selected according to process requirements, and the dosage is adjusted between approximately 0.1% and 3%. Preferably, the extruder heating temperature range within the screw is set between 150℃ ± 30℃, and the foam density is controlled at 0.4 g / cm³. 3 ~1g / cm 3 In the process, the key point is whether the foaming agent is evenly dispersed. If it is not suitable, the foaming agent should be modified or mixed. This invention achieves the effect of layered stacking of materials by setting a cooling gradient and controlling the action and action time of the foaming agent. Decorative building materials should be lightweight with a density controlled below 0.6 g / cm3, while general-purpose building materials should be standardized with a density controlled below 0.6 g / cm3. 3 ~0.7g / cm 3 In the meantime, structural building materials should focus on strengthening mechanical stress while controlling density to 0.7 g / cm³. 3 The above is better.

[0030] This invention utilizes the single-screw operation of a screw extruder to allow thermoplastic polymer composite copolymer mixtures to flow in a spiral, swirling, and interlaced manner. Ultimately, the material is layered and aggregated, then extruded after being evenly distributed through a honeycomb structure under back pressure. The operating parameters, such as temperature, speed, and pressure, must be precisely controlled in the feeding zone, melting zone, metering zone, torpedo zone, and mixing zone. The screw movement of the screw extruder simultaneously achieves the mixing, stirring, agitation, layering, foaming, and extrusion of the material.

[0031] c. Cooling and Molding Step: The thermoplastic polymer composite copolymer mixture extruded by the screw extruder is conveyed to a cooling mold. The cooling gradient of the mold is controlled by circulating water flow between 150°C and 40°C, allowing the thermoplastic polymer composite copolymer mixture to gradually cool and solidify to room temperature for curing. This results in integrally molded and recyclable building corner pieces and panels. The thermoplastic polymer composite copolymer mixture extruded by the screw extruder is still in the softening, foaming, and expanding stage. The subsequent cooling process is divided into four stages: Stage 1: Fixing and molding the outermost surface layer; Stage 2: Fixing and molding the second layer within the surface layer; Stage 3: Cooling and molding the core of the building material, ensuring the core no longer expands or foams; Stage 4: After cutting and molding, the building material is left to cool and cure naturally at room temperature.

[0032] The recyclable building corner pieces and panels produced by the above method can not only replace wood as building materials, but also utilize the technology for manufacturing recycled polystyrene (rPS) building materials. This technology achieves a balanced interlocking and tensioning behavior between the polymer molecules of each plastic material from the inside out, reducing the problem of interfacial separation between thermoplastic polymers. Different material ratios can be adjusted to improve the rigidity, toughness, and impact resistance of the corner pieces. Furthermore, to address the shortcomings of the main substrate material of recycled polystyrene (rPS), the proportion of compatibility-modified elastic plastics can be increased from 10% to 20%, combined with foaming technology, to meet the application requirements of recycled polystyrene (rPS) in different structural components. The stability of the recycled polystyrene (rPS) polymerized granules within the usage range is confirmed, and specific substances can be added for conditioning and strengthening when special needs arise. For example, increasing the softening temperature, adding functional additives to increase hardness, and improving the heat resistance and antibacterial properties of the corner pieces.

[0033] Then as Figure 2 , Figure 3 The diagram shows a structural schematic and a photograph of the recyclable building corner and panel material produced according to the present invention. It comprises a building material body 10, which, from the outside in, consists of an outermost surface layer 11, a mesh fiber stacked layer 12 inside the surface layer 11, and a support filling layer 13 at the core of the building material body 10.

[0034] The thickness of the surface layer 11 is a smooth, mesh-like water ripple surface formed by the thermoplastic polymer composite copolymer mixture of recycled polystyrene (rPS) and compatible modified elastic plastic after it hardens upon cooling and compression and rubs against the surface of the cooling mold. Its thickness is about 1 to 2 mm, and it can be used to present the physical properties, texture, characteristics, etc. of building materials stacked to form a hard shell structure on the outer surface of the building material body 10. The smooth, corrugated surface is primarily achieved by controlling production parameters to prevent material adhesion. Secondly, the surface of the cooling mold must be sufficiently polished to prevent dust accumulation. The smooth surface also allows the building material itself (10) to have a self-cleaning function, making cleaning and maintenance easier and reducing the likelihood of absorbing other liquids. The corrugated surface is formed by continuously weaving fiber bundles of recycled polystyrene (rPS) and compatible modified elastic plastics into a mesh structure under screw extrusion parameters, resulting in a water ripple texture. This contrasts with the less uniform color and less vibrant embossed patterns of typical WPC plastics. Furthermore, the surface hardness of this layer (11) can range from approximately 3H to 4H (Mohs hardness), and can be adjusted as needed. By appropriately increasing the proportion of inorganic materials by 1%-5%, and by controlling the extruder temperature, discharge speed, and internal pressure (compression ratio range of 2-4 times), the surface hardness of the material can be adjusted to achieve certain scratch and wear resistance. The smooth mesh-like water ripple surface of the surface layer 11 still has capillary pores, which allow water molecules to adhere to each other when there are water molecules on its surface. In addition, the surface layer 11 also has some raised textures of mesh fibers, which have a certain friction. This fully utilizes the characteristic that the building material body 10 can also be used outdoors. Under anti-slip test, with tap water as the medium and shoes worn, its CSR value can be between 0.7 and 0.8. Under anti-slip test with tap water mixed with talcum powder as the medium and barefoot, its CSR value can be between 0.5 and 0.6.

[0035] The mesh fiber stacked layer 12 is a thermoplastic polymer composite copolymer mixture made of recycled polystyrene (rPS) and compatible modified elastic plastic. Under the action of the screw movement in the screw extruder, the cooling time of the cooling mold, and the alternating action of foaming force and reaction force, a layered structure with a continuous stacked gradient about 3-5mm thick in the direction perpendicular to the mold surface is generated. This allows it to form a continuous layer inside the surface layer 11 with a mesh water ripple surface. The long and short bundles of fibers in the thermoplastic polymer are stacked and chemically foamed to form a high-density stacked gradient structure in the direction perpendicular to the mold surface, forming a structural inner layer with building material structural stress. The corners and panels manufactured in this way can be strengthened in terms of structural properties such as bending resistance, compression resistance, shear resistance, and tensile resistance. The thickness of the high-density stacked gradient structure can also be controlled by changing the raw material ratio, and different densities can be adjusted to manufacture building corners and panels that meet the needs of different structural levels.

[0036] The support filling layer 13 is a core component composed of recycled polystyrene (rPS) and compatible modified elastic plastic. Due to the limited vertical, horizontal, left, and right extension within the cooling mold, and the longer cooling and foaming time within the core, the core is filled with interwoven micro-closed air bubbles and a network of fiber polymer materials, forming a support filling layer of 5-10 mm or more composed of micro-bubbles and fibers. This creates a lightweight, interwoven support structure that not only disperses concentrated impact stress and reduces damage, but also reduces the overall profile weight and the manual labor required for handling and installation. Furthermore, the solid internal structure of the building material 10, compared to hollow wood-plastic composites, strengthens the material's mechanical stress, and the density can be controlled to 0.4 g / cm³ for different applications. 3 ~1g / cm 3 Adjustments will be made between them.

[0037] As described above, the recyclable building corner and panel materials produced by this invention have a rigid and smooth mesh-like corrugated surface layer 11 on the outer surface (the surface of the plastic becomes smooth mesh-like corrugated after cooling, compression, hardening, and friction, about 1-2 mm thick). The inner surface is a mesh-like fiber stack layer 12 composed of high-density long and short fiber bundles of a thermoplastic polymer composite copolymer, formed by recycled polystyrene (rPS) and compatible modified elastic plastic (about 3-5 mm thick, formed by the alternating directional stacking of plastic under the action and reaction forces of screw movement and foaming). The core part is filled with recycled polystyrene (rPS) and compatible modified elastic plastic after being separated and foamed from a thermoplastic polymer composite copolymer. The closed-cell bubble and mesh fiber structure of the support filling layer 13 (comprising 5-10mm or more of bubbles and plastic fibers) enables the recyclable building corners and panels produced by this invention to not only fully exhibit the comprehensive structural characteristics of the polymer composite of recycled polystyrene (rPS) thermoplastic, but also to be structurally complete building corners and panels produced in one step. This effectively improves the defects of existing WPC wood-plastic composites, including PP+PE+wood flour, PE+PET+polyester, TPE elastomer, HIPS / PS, and other existing single WPC building materials in terms of brittleness, toughness, hardness, impact resistance, rigidity, weather resistance, and recycling, as well as the physical property defects caused by the unbalanced shrinkage of mixed materials and plastics.

[0038] Furthermore, in the process of manufacturing architectural corner pieces and panels using recycled polystyrene (rPS) recycled thermoplastic polymer composites, this invention allows for control of the foaming ratio or density through the dosage of chemical foaming agents, achieving variations in both density and structural strength of the lightweight profile. Adjusting the ratio and layering of the recycled polystyrene (rPS) thermoplastic polymer reduces the rigidity of the profile surface, resulting in better flexibility and workability for architectural corner pieces and panels. By classifying and using recycled polystyrene (rPS), architectural corner pieces and panels that meet the cost and safety requirements of different structural applications can be selected, particularly increasing impact resistance and reducing brittle fracture. The manufacturing method provided by this invention... This invention offers several advantages, including the ability to recycle over 70% of the polystyrene (rPS) substrate, as well as the disposal of scrap materials from factory edges and corner / board materials for future raw material recycling. All materials are ultimately 100% recyclable. Furthermore, the invention utilizes a screw extruder with controlled temperature, speed, and pressure parameters to precisely control the thermoplastic polymer composite during feeding, mixing, blending, softening, and flow disturbance. This process, along with the stable stratification and separation of the polymer molecules within the screw and the interaction with foaming forces, results in a single, integrated, structurally sound architectural corner and board structure produced through mold extrusion and circulating water cooling. This process also facilitates easy quality control and makes the invention highly practical.

[0039] However, the above embodiments are only for illustrating the present invention and are not intended to limit the present invention. Any substitution of equivalent elements should still fall within the scope of the present invention.

[0040] In summary, this invention demonstrates to those skilled in the art that it can indeed achieve the aforementioned objectives, and thus complies with the provisions of the Patent Law; therefore, this application is filed in accordance with the law.

Claims

1. A method for manufacturing a recyclable building angle member and a recyclable building plate member made of a recycled thermoplastic polymer composite, characterized in that The process includes the following steps: a. Material preparation steps: Using recycled polystyrene as the base material, and adding a certain proportion of compatible modified elastic plastic, foaming agent to make the base material lightweight, and other functional additives, the mixture is then mixed together in a mixer to form a composite material. The recycled polystyrene accounts for 70% to 80% of the total content of the composite material, the compatible modified elastic plastic accounts for 10% to 20% of the total content of the composite material, and the foaming agent and other functional additives are controlled to be within 10% of the total content of the composite material. b. Heating and extrusion step: The mixed material is fed into a screw extruder. After being heated by the screw extruder and stirred and divided by the screw, the mixed material becomes a thermoplastic polymer composite copolymer mixture. c. Cooling and molding step: The thermoplastic polymer composite copolymer mixture extruded by the screw extruder is conveyed to a cooling mold. The cooling gradient of the cooling mold is controlled by circulating water flow from 150°C to 40°C, so that the thermoplastic polymer composite copolymer mixture is gradually cooled and shaped to room temperature and matured, and can be made into one-piece molded and recyclable building corner pieces and panels.

2. The method for manufacturing a recyclable building angle or plate from a recycled thermoplastic polymer composite material according to claim 1, characterized in that: The screw extruder consists of a single screw extruder with a compression ratio of 2 to 4 times. The extruder heating temperature is controlled between 120°C and 200°C, and the screw speed is controlled between 15 and 45 rpm for heating and extrusion operation.

3. The method of claim 1, wherein the recycled thermoplastic polymer composite is used to manufacture a recyclable building corner member or a recyclable building panel. The compatibility-modified elastic plastic is composed of at least one thermoplastic polymer material, namely TPU, TPO, TPV, TPS, TPR, NR, IR, SBR, BR, CR, IIR, NBR, or EPDM.

4. The method of claim 1, wherein the recycled thermoplastic polymer composite is used to manufacture a recyclable building corner member or a recyclable building panel. The foaming agent is selected from AC azo type chemical foaming agent, and the dosage of the foaming agent is adjusted to be between 0.1% and 3%, the heating temperature range of the extruder is set to be between 150°C±30°C, and the cooling gradient of the cooling mold is from 150°C to 40°C, so that the foaming density is controlled to be between 0.4 g / cm 3 ~1 g / cm 3 .

5. The method of claim 1, wherein the recycled thermoplastic polymer composite is used to manufacture a recyclable building corner member or a recyclable building panel. Other functional additives consist of colorants, dispersants, stabilizers, or fillers.

6. The method of claim 5, wherein the recycled thermoplastic polymer composite is used to manufacture a recyclable building corner member or a recyclable building panel. The filler is composed of organic wood powder or inorganic stone powder, dust or powder, recycled polyethylene, recycled polypropylene, recycled polycarbonate or recycled acrylonitrile-butadiene-styrene copolymer.

7. The method of claim 1, wherein the recycled thermoplastic polymer composite is used to manufacture a recyclable building angle or plate. During the mixing process of the materials in the mixer, a drying operation is carried out simultaneously under the conditions of drying temperature 80℃ and drying for 2 hours.

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