Three-layer co-pressing wall tile and preparation method thereof

Abstract

The invention discloses a three-layer co-pressing wall tile and a preparation method thereof, and relates to the field of constructional engineering. The three-layer co-pressing wall tile comprises a surface layer, a bonding layer and a base material layer which are sequentially arranged from top to bottom, and the base material layer comprises the following raw materials in parts by weight: 40-70 parts of PVC resin powder; 13-25 parts of light calcium carbonate; 4-9 parts of a stabilizer; 1-3 parts of polyethylene wax; 2-5 parts of stearic acid; 7-11 parts of chlorinated polyethylene; 3-8 parts of modified straw fiber; and 4-10 parts of hollow ceramic microbeads. The weather resistance and impact resistance of the synthetic resin tile are improved, so that the wall tile can meet the use requirements of resisting wind and rain erosion and ultraviolet irradiation for a long time.

Description

Technical Field

[0001] The present invention relates to the field of construction engineering, and particularly relates to a three-layer co-pressed gable tile and a preparation method thereof. Background Art

[0002] A gable tile is a kind of tile used for building decoration, usually installed on the top of a wall, serving the functions of beautifying and protecting the wall. The types of gable tiles include resin tiles, antique tiles, small blue tiles, gable end tiles, etc. Among them, as a new generation of light material vigorously advocated and promoted in China, resin tiles are widely used because of their many excellent properties such as light weight, high strength, waterproof, moisture-proof, anti-corrosion, flame-retardant, sound insulation and heat insulation.

[0003] Resin tiles include natural resin tiles and synthetic resin tiles. Synthetic resin tiles are new building materials developed by applying high-tech chemical engineering technologies, and are suitable for various structural new pitched roofs such as concrete structures, steel structures, wood structures, and brick-wood mixed structures, as well as the flat-to-pitched roof renovation projects of old buildings.

[0004] The main component of the existing synthetic resin tiles is synthetic resin. When installed on the top of a wall as a gable tile, the existing synthetic resin tiles have poor weather resistance and impact resistance, and cannot meet the use requirements of long-term resistance to wind, rain erosion and ultraviolet radiation. Summary of the Invention

[0005] In order to improve the weather resistance and impact resistance of synthetic resin tiles and meet the use requirements of long-term resistance to wind, rain erosion and ultraviolet radiation, the present application provides a three-layer co-pressed gable tile and a preparation method thereof.

[0006] The three-layer co-pressed gable tile and the preparation method thereof provided by the present application adopt the following technical solutions: In a first aspect, the present application provides a three-layer co-pressed gable tile, which includes a surface layer, a bonding layer and a base material layer arranged in sequence from top to bottom. The base material layer includes the following raw materials in parts by weight: PVC resin powder 40 - 70 parts; Light calcium carbonate 13 - 25 parts; Stabilizer 4 - 9 parts; Polyethylene wax 1 - 3 parts; Stearic acid 2 - 5 parts; Chlorinated polyethylene 7 - 11 parts; Modified straw fiber 3 - 8 parts; Hollow ceramic microspheres 4 - 10 parts.

[0007] By adopting the above technical solutions, in the wall head tile, the surface layer has good coloring property and weather resistance, providing a variety of colors; the bonding layer is used to promote the bonding between the surface layer and the substrate layer, making the integrity of the wall head tile good; the substrate layer, as the main body layer of the wall head tile, is used to provide wear resistance and good mechanical properties.

[0008] In the substrate layer, PVC resin powder and light calcium carbonate are selected as the main raw materials, making the substrate layer have good rigidity. The addition of chlorinated polyethylene is used to increase toughness. The modified straw fiber can be evenly dispersed in the PVC resin powder and combined with the resin to form a three-dimensional skeleton structure, which can enhance the impact strength and stability of the matrix layer. At the same time, the sound insulation and heat insulation properties are enhanced. The addition of hollow ceramic microspheres as fillers improves the mechanical properties of the matrix layer, and the hollow characteristics play a role in heat insulation. Thus, through the modified straw fiber and hollow ceramic microspheres, the matrix layer has flame retardancy. The stabilizer is used to ensure the stable molding of the matrix layer during the heating process. The lubricity is increased by the addition of stearic acid and polyethylene wax, which is convenient for processing. Through the compounding of specific components, the entire wall head tile has excellent strength, impact resistance and good weather resistance.

[0009] Preferably, the modified straw fiber is prepared through the following steps: Straw pretreatment: Wash the straw raw materials and remove the knot nodes, cut them into straw fibers of 12 - 15 mm, and place the straw fibers at 70 - 75 °C for drying for 10 - 12 h; Solution gel treatment: Dissolve tetraethyl orthosilicate in water to obtain a tetraethyl orthosilicate solution with a mass fraction of 2% - 5%, hydrolyze it under magnetic stirring for 12 - 13 h, add ammonia water to the hydrolyzed solution to make the solution pH reach 6.5 - 7.5, add the straw fibers to the solution to form a gel, place it in an oven for drying, and take out to obtain the modified straw fiber.

[0010] By adopting the above technical solutions, tetraethyl orthosilicate hydrolyzes to obtain silanol groups. Ammonia water serves as a catalyst, and through the sol - gel technology, silica particles are loaded onto the surface of the straw fibers, increasing the surface roughness of the modified straw fiber, having excellent hydrophobicity, and increasing the compatibility with the polyvinyl chloride resin system, which is beneficial to improving the waterproofness and impact strength of the resin tile.

[0011] Preferably, the hollow ceramic microspheres selected are pretreated hollow ceramic microspheres, and the steps are as follows: Select silane coupling agent KH - 550 and add it to a mixed solution of absolute ethanol and water with a ratio of 1:1 to prepare a mixed solution with a mass fraction of the silane coupling agent of 6% - 10%; Put the hollow ceramic microspheres into a blender, inject the prepared mixed solution into the hollow ceramic microspheres, stir ultrasonically for 1 - 1.5 h, take out and filter, and dry in vacuum to obtain the hollow ceramic microspheres.

[0012] By adopting the above technical solution, the hollow ceramic microspheres pretreated with silane coupling agent KH-550 can be more stably dispersed in the three-dimensional framework system formed by polyvinyl chloride resin and modified straw fiber, and play a reinforcing role more fully.

[0013] Preferably, the surface layer comprises the following raw materials in parts by weight: 78 - 90 parts of ASA resin; 0.8 - 1.5 parts of titanium dioxide; 0.3 - 0.5 part of ultraviolet absorber; 0.3 - 0.5 part of hindered amine light stabilizer; 3 - 6 parts of flame retardant.

[0014] By adopting the above technical solution, ASA resin is used to resist the erosion of the external environment on the wall tile. By adding ultraviolet absorber, hindered amine light stabilizer and flame retardant, the erosion of ultraviolet ray, temperature and light on the wall tile is resisted, and the weather resistance and flame retardancy of the resin tile are enhanced.

[0015] Preferably, the bonding layer is composed of one or more of PMMA resin, EVA hot melt adhesive, PVB hot melt adhesive and polyolefin hot melt adhesive.

[0016] By adopting the above technical solution, the bonding layer prepared from the above components has excellent bonding performance and improves the overall stability of the resin tile.

[0017] Preferably, the ultraviolet absorber is one or more of phenyl salicylate, 2,4-dihydroxybenzophenone and 2-hydroxy-4-n-octyloxybenzophenone, and the flame retardant is selected from one or more of decabromodiphenyl ether, tetrabromobisphenol A and magnesium chloride.

[0018] Preferably, the stabilizer is selected from one or more of dibasic lead phosphite stabilizer, dibasic lead stearate stabilizer and tribasic lead sulfate stabilizer.

[0019] By adopting the above technical solution, the lead-containing stabilizer can prevent the resin tile from oxidizing and decomposing during the heating process and ensure the smooth molding of the resin tile.

[0020] Preferably, the particle size of the hollow ceramic microspheres is 10 - 30 μm.

[0021] By adopting the above technical solution, the hollow ceramic microspheres with the above particle size can be more fully filled into the three-dimensional system, making the comprehensive performance of the resin tile better.

[0022] In a second aspect, the present application provides a preparation method of a three-layer co-pressed wall tile, comprising the following steps: Mixing: The surface layer, adhesive layer, and base material layer are respectively mixed and stirred according to the formula to ensure uniform mixing of the materials. Pelletizing: The uniformly mixed materials of the surface layer, adhesive layer, and base material layer are respectively pelletized at a temperature of 170 - 220 °C. Plasticizing: The pelletized surface layer, adhesive layer, and base material layer are respectively plasticized at a temperature of 180 - 230 °C. Co - extrusion: The materials of the surface layer, adhesive layer, and base material layer are dried, and then conveyed to a co - extrusion die through an extruder for extrusion and stacked in sequence. Pressing: The stacked surface layer, adhesive layer, and base material layer are pressed into shape through a pressing die, and after cooling and forming, they are cut to obtain a three - layer co - pressed gable tile.

[0023] By adopting the above technical solution, a gable tile with excellent weather resistance and waterproofness is obtained by using the technology of three - layer co - extrusion and co - pressing. At the same time, the gable tile of this application has good impact resistance, flame retardancy, and abrasion resistance, meeting the use requirements of long - term resistance to wind, rain erosion, and ultraviolet radiation.

[0024] In summary, this application has at least one of the following beneficial effects: In the gable tile, the surface layer has good colorability and weather resistance, providing a variety of colors; the adhesive layer is used to promote the bonding between the surface layer and the base material layer, making the integrity of the gable tile good; the base material layer, as the main body layer of the gable tile, is used to provide abrasion resistance and good mechanical properties.

[0025] In the base material layer, PVC resin powder and light calcium carbonate are selected as the main raw materials, making the base material layer have good rigidity. The addition of chlorinated polyethylene is used to increase toughness. The modified straw fiber can be evenly dispersed in the PVC resin powder and combined with the resin to form a three - dimensional skeleton structure, which can enhance the impact strength and stability of the matrix layer. At the same time, the sound insulation and heat insulation performance are enhanced. The addition of hollow ceramic microspheres as fillers improves the mechanical properties of the matrix layer, and the hollow characteristics play a heat - insulating role, so that the matrix layer has flame retardancy through the modified straw fiber and hollow ceramic microspheres. The stabilizer is used to ensure the stable forming of the matrix layer during the heating process. The addition of stearic acid and polyethylene wax increases lubricity, facilitating processing. Through the compounding of specific components, the entire gable tile has excellent strength, impact resistance, and good weather resistance. Specific Embodiments

[0026] The following further elaborates on this application in combination with Examples 1 - 7 and Comparative Examples 1 - 2.

[0027] Preparation Examples Preparation Example 1 A kind of modified straw fiber is prepared through the following steps: Straw pretreatment: Wash the straw raw materials, remove the knot nodes, cut the straw into straw fibers of 12 - 15 mm, put the cut straw fibers into an oven, and dry them at 70 °C for 12 h; Solution gel treatment: Dissolve tetraethyl orthosilicate in water to obtain a tetraethyl orthosilicate solution with a mass fraction of 2%, magnetically stir and hydrolyze for 12 h. In the hydrolyzed solution, add ammonia water dropwise to make the pH of the solution 6.5. Add the straw fibers to the solution to form a gel, place the gel in an oven, dry at 80 °C for 72 h, and take out to obtain modified straw fibers.

[0028] Preparation Example 2 A kind of modified straw fiber is prepared by the following steps: Straw pretreatment: Wash the straw raw materials, remove the knot nodes, cut the straw into straw fibers of 12 - 15 mm, put the cut straw fibers into an oven, and dry them at 75 °C for 10 h; Solution gel treatment: Dissolve tetraethyl orthosilicate in water to obtain a tetraethyl orthosilicate solution with a mass fraction of 5%, magnetically stir and hydrolyze for 13 h. In the hydrolyzed solution, add ammonia water dropwise to make the pH of the solution 7.5. Add the straw fibers to the solution to form a gel, place the gel in an oven, dry at 82 °C for 72 h, and take out to obtain modified straw fibers.

[0029] Preparation Example 3 A kind of modified straw fiber is prepared by the following steps: Straw pretreatment: Wash the straw raw materials, remove the knot nodes, cut the straw into straw fibers of 12 - 15 mm, put the cut straw fibers into an oven, and dry them at 73 °C for 11 h; Solution gel treatment: Dissolve tetraethyl orthosilicate in water to obtain a tetraethyl orthosilicate solution with a mass fraction of 4%, magnetically stir and hydrolyze for 12 h. In the hydrolyzed solution, add ammonia water dropwise to make the pH of the solution 7. Add the straw fibers to the solution to form a gel, place the gel in an oven, dry at 80 °C for 72 h, and take out to obtain modified straw fibers. Examples

[0030] Example 1 A three - layer co - pressed wall tile includes a surface layer, a bonding layer, and a base layer, where the surface layer, the bonding layer, and the base layer are arranged in sequence from top to bottom, and the bonding layer is composed of PMMA resin.

[0031] The surface layer includes the following raw materials: 78 kg of ASA resin, specifically select the ASA resin of model LG LI941 from Suzhou Xinrunqian International Trade Co., Ltd.; 0.8 kg of titanium dioxide; 0.3 kg of ultraviolet absorber, specifically phenyl salicylate is selected; 0.3 kg of hindered amine light stabilizer; 3 kg of flame retardant, specifically decabromodiphenyl ether is selected.

[0032] The base material layer comprises the following raw materials: 40 kg of PVC resin powder, specifically SG-5 type polyvinyl chloride resin powder produced by Wuhan Xindongyi Chemical Co., Ltd. is selected; 13 kg of light calcium carbonate, specifically light calcium carbonate with an average particle size of 5 μm is selected; 4 kg of stabilizer, specifically lead phosphite dibasic stabilizer is selected; 1 kg of polyethylene wax; 2 kg of stearic acid; 7 kg of chlorinated polyethylene, specifically Warner CPE135 type chlorinated polyethylene produced by Wuhan Xindongyi Chemical Co., Ltd. is selected; 3 kg of modified straw fiber, specifically the modified straw fiber prepared in Preparation Example 1 is selected; 4 kg of hollow ceramic microspheres, specifically hollow ceramic microspheres with an average particle size of 10 μm are selected.

[0033] The preparation method of the three-layer co-extruded gable tile comprises the following steps: Mixing: The raw materials of the surface layer, the bonding layer and the base material layer are respectively mixed and stirred according to the formula to ensure uniform mixing of the materials; Pelletizing: The uniformly mixed materials of the surface layer, the bonding layer and the base material layer are respectively pelletized at a temperature of 170 °C; Plasticizing: The pelletized surface layer, bonding layer and base material layer are respectively plasticized at a temperature of 180 °C; Co-extrusion: The materials of the surface layer, the bonding layer and the base material layer are dried, and then conveyed to a co-extrusion die through an extruder for extrusion and stacked in sequence; Pressing: The stacked surface layer, bonding layer and base material layer are pressed into shape by a pressing die, and after cooling and shaping, they are cut to obtain the three-layer co-extruded gable tile.

[0034] Example 2 A three-layer co-extruded gable tile, comprising a surface layer, a bonding layer and a base material layer, wherein the surface layer, the bonding layer and the base material layer are arranged in sequence from top to bottom, and the bonding layer is composed of EVA hot melt adhesive.

[0035] The surface layer comprises the following raw materials: 90 kg of ASA resin, specifically ASA resin with the model of LG LI941 produced by Suzhou Xinrunqian International Trade Co., Ltd. is selected; 1.5 kg of titanium dioxide; 0.5 g of ultraviolet absorber, specifically 2,4-dihydroxybenzophenone is selected; 0.5 kg of hindered amine light stabilizer; 6 kg of flame retardant, specifically tetrabromobisphenol A is selected.

[0036] The base material layer comprises the following raw materials: 70 kg of PVC resin powder, specifically SG-5 type polyvinyl chloride resin powder of Wuhan Xindongyi Chemical Co., Ltd. is selected; 25 kg of light calcium carbonate, specifically light calcium carbonate with an average particle size of 8 μm is selected; 9 kg of stabilizer, specifically lead dibasic stearate stabilizer is selected; 3 kg of polyethylene wax; 5 kg of stearic acid; 11 kg of chlorinated polyethylene, specifically Warner CPE135 type chlorinated polyethylene of Wuhan Xindongyi Chemical Co., Ltd. is selected; 8 kg of modified straw fiber, specifically the modified straw fiber prepared in Preparation Example 2 is selected; 10 kg of hollow ceramic microspheres, specifically hollow ceramic microspheres with an average particle size of 30 μm are selected.

[0037] The preparation method of the three-layer co-extruded gable tile comprises the following steps: Mixing: The raw materials of the surface layer, the bonding layer and the base material layer are respectively mixed and stirred according to the formula to ensure uniform mixing of the materials; Pelletizing: The uniformly mixed materials of the surface layer, the bonding layer and the base material layer are respectively pelletized at a temperature of 220 °C; Plasticizing: The pelletized surface layer, bonding layer and base material layer are respectively plasticized under the condition of a temperature of 230 °C; Co-extruding: The materials of the surface layer, the bonding layer and the base material layer are dried, and then conveyed to a co-extrusion die through an extruder for extrusion and stacked in sequence; Pressing: The stacked surface layer, bonding layer and base material layer are pressed into shape through a pressing die, and are cut after cooling and shaping to obtain the three-layer co-extruded gable tile.

[0038] Example 3 A three-layer co-extruded gable tile, comprising a surface layer, a bonding layer and a base material layer, wherein the surface layer, the bonding layer and the base material layer are arranged in sequence from top to bottom, and the bonding layer is composed of PVB hot melt adhesive and polyolefin hot melt adhesive.

[0039] The surface layer comprises the following raw materials: 83 kg of ASA resin, specifically ASA resin of Suzhou Xinrunqian International Trade Co., Ltd., model LG LI941 is selected; 1.2 kg of titanium dioxide; 0.4 kg of ultraviolet absorber, specifically 2-hydroxy-4-n-octyloxybenzophenone is selected; 0.4 kg of hindered amine light stabilizer; 5 kg of flame retardant, specifically magnesium chloride is selected.

[0040] The base material layer comprises the following raw materials: 58 kg of PVC resin powder, specifically SG-5 type polyvinyl chloride resin powder from Wuhan Xindongyi Chemical Co., Ltd. is selected; 21 kg of light calcium carbonate, specifically light calcium carbonate with an average particle size of 7 μm is selected; 7 kg of stabilizer, specifically tribasic lead sulfate stabilizer is selected; 2 kg of polyethylene wax; 3 kg of stearic acid; 9 kg of chlorinated polyethylene, specifically Warner CPE135 type chlorinated polyethylene from Wuhan Xindongyi Chemical Co., Ltd. is selected; 6 kg of modified straw fiber, specifically the modified straw fiber prepared in Preparation Example 3 is selected; 8 kg of hollow ceramic microspheres, specifically hollow ceramic microspheres with an average particle size of 23 μm are selected.

[0041] The preparation method of the three-layer co-pressed gable tile comprises the following steps: Mixing: The raw materials of the surface layer, the bonding layer and the base material layer are respectively mixed and stirred according to the formula to ensure uniform mixing of the materials; Pelletizing: The uniformly mixed materials of the surface layer, the bonding layer and the base material layer are respectively pelletized at a temperature of 170 °C; Plasticizing: The pelletized surface layer, bonding layer and base material layer are respectively plasticized at a temperature of 180 °C; Co-extrusion: The materials of the surface layer, the bonding layer and the base material layer are dried, and then conveyed to a co-extrusion die through an extruder for extrusion and stacked in sequence; Pressing: The stacked surface layer, bonding layer and base material layer are pressed into shape through a pressing die, and cut after cooling and shaping to obtain the three-layer co-pressed gable tile.

[0042] Example 4 The difference between this example and Example 1 is that the hollow ceramic microspheres in the base material layer of the gable tile are different.

[0043] The hollow ceramic microspheres in this example are pretreated hollow ceramic microspheres, and the steps are as follows: Select silane coupling agent KH-550 and add it to a mixed solution of absolute ethanol and water at a ratio of 1:1 to prepare a mixed solution with a mass fraction of silane coupling agent of 6%; Put the hollow ceramic microspheres into a blender, inject the prepared mixed solution into the hollow ceramic microspheres, stir ultrasonically for 1 h, take out and filter, and vacuum dry at 60 °C for 4 h to obtain the hollow ceramic microspheres.

[0044] Example 5 The difference between this embodiment and Embodiment 1 lies in that the hollow ceramic microspheres in the base material layer of the gable tile are different.

[0045] The hollow ceramic microspheres in this embodiment are selected as pretreated hollow ceramic microspheres, and the steps are as follows: Select silane coupling agent KH-550 and add it to a mixed solution of absolute ethanol and water at a ratio of 1:1 to prepare a mixed solution with a mass fraction of silane coupling agent of 10%; Put the hollow ceramic microspheres into a blender, inject the prepared mixed solution into the hollow ceramic microspheres, stir ultrasonically for 1 h, take out and filter, and vacuum dry at 65 °C for 5 h to obtain the hollow ceramic microspheres.

[0046] Embodiment 6 The difference between this embodiment and Embodiment 1 lies in that the hollow ceramic microspheres in the base material layer of the gable tile are different.

[0047] The hollow ceramic microspheres in this embodiment are selected as hollow ceramic microspheres with an average particle size of 35 μm.

[0048] Embodiment 7 The difference between this embodiment and Embodiment 1 lies in that the hollow ceramic microspheres in the base material layer of the gable tile are different.

[0049] The hollow ceramic microspheres in this embodiment are selected as hollow ceramic microspheres with an average particle size of 5 μm.

[0050] Comparative Example Comparative Example 1 The difference between this comparative example and Embodiment 1 lies in that the raw materials of the base material layer of the gable tile are different.

[0051] In this comparative example, equal mass of straw fiber is selected to replace the modified straw fiber in the raw materials of the base material layer.

[0052] Comparative Example 2 The difference between this comparative example and Embodiment 1 lies in that the raw materials of the base material layer of the gable tile are different.

[0053] In this comparative example, no hollow ceramic microspheres are added to the raw materials of the base material layer.

[0054] Weather resistance performance detection: Use a testing machine of daylight carbon arc lamp type to irradiate the gable tiles prepared in each embodiment and comparative example for 600 h, and observe the situation of the gable tiles.

[0055] Tensile strength: Test according to the standard of GB / T 1040.1-2006 "Determination of Tensile Properties of Plastics", and record the results.

[0056] Notched impact strength: Test according to the standard of GB / T 1043.1-2008 "Determination of Izod Impact Strength of Plastics", and record the results.

[0057] Abrasion resistance: Use a wear testing machine (Taber abraser, wear wheel CS-17, weight 1.0 kg) to rotate and grind 5000 revolutions, and observe whether there are changes in the surface texture of the gable roof tiles.

[0058] Table 1 As can be seen from the above table, the gable roof tiles prepared in this application are set as a three-layer co-extrusion and co-compression structure of a surface layer, a bonding layer, and a base layer, with excellent weather resistance and abrasion resistance, and relatively high tensile strength and notched impact strength.

[0059] Compared with Example 1, hollow ceramic microspheres pretreated by modification with silane coupling agent KH-550 are used in Examples 4-5, which further enhances the performance of the gable roof tiles.

[0060] It can be seen from Examples 6-7 that after changing the particle size of the hollow ceramic microspheres, the performance of the gable roof tiles decreases. This is because hollow ceramic microspheres with appropriate particle size can fill the voids in the three-dimensional network system, making the integrity of the gable roof tiles better.

[0061] Compared with Example 1, the performance of the gable roof tiles in Comparative Example 1 decreases. This is because, after modifying the straw fibers by the sol-gel method in Example 1, silica particles are loaded on the straw fibers, making the straw fibers change from hydrophilic to hydrophilic. The dispersibility and compatibility of the modified straw fibers in the PVC resin system increase, thereby enhancing the strength, abrasion resistance, and impact resistance of the gable roof tiles.

[0062] Compared with Example 1, the performance of the gable roof tiles in Comparative Example 2 decreases. This is because, in Example 1, hollow glass microspheres are added, which can cooperate with other raw materials to enhance the gable roof tiles, resulting in an improvement in the mechanical properties of the gable roof tiles.

[0063] This specific embodiment is only an interpretation of this application, and it is not a limitation of this application. Those skilled in the art can make modifications without creative contributions to this specific embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of this application, it is protected by the patent law.

Claims

1. A three-layer co-pressed wall head tile, characterized in that: It includes a surface layer, an adhesive layer, and a base material layer arranged in sequence from top to bottom. The base material layer includes the following raw materials in parts by weight: PVC resin powder: 40 - 70 parts; Light calcium carbonate: 13 - 25 parts; Stabilizer: 4 - 9 parts; Polyethylene wax: 1 - 3 parts; Stearic acid: 2 - 5 parts; Chlorinated polyethylene: 7 - 11 parts; Modified straw fiber: 3 - 8 parts; Hollow ceramic microspheres: 4 - 10 parts.

2. The three-layer co-pressed gable tile according to claim 1, characterized in that, The modified straw fiber is prepared through the following steps: Straw pretreatment: Wash the straw raw materials and remove the knot nodes, cut them into straw fibers of 12 - 15 mm, and dry the straw fibers at 70 - 75 °C for 10 - 12 h; Solution gel treatment: Dissolve tetraethyl orthosilicate in water to obtain a tetraethyl orthosilicate solution with a mass fraction of 2% - 5%, hydrolyze it under magnetic stirring for 12 - 13 h, add ammonia water to the hydrolyzed solution to make the solution pH reach 6.5 - 7.5, add the straw fibers to the solution to form a gel, dry it in an oven, and take out to obtain the modified straw fiber.

3. A three-layer co-pressed gable tile according to claim 1, characterized in that: The selected hollow ceramic microspheres are pretreated hollow ceramic microspheres, and the steps are as follows: Select silane coupling agent KH-550 and add it to a mixed solution of anhydrous ethanol and water at a ratio of 1:1 to prepare a mixed solution with a mass fraction of 6% - 10% of the silane coupling agent; Put the hollow ceramic microspheres into a blender, inject the prepared mixed solution into the hollow ceramic microspheres, stir ultrasonically for 1 - 1.5 h, take out and filter, and dry in vacuum to obtain the hollow ceramic microspheres.

4. The three-layer co-pressed gable tile according to claim 1, characterized in that: The surface layer includes the following raw materials in parts by weight: ASA resin: 78 - 90 parts; Titanium dioxide: 0.8 - 1.5 parts; Ultraviolet absorber: 0.3 - 0.5 parts; Hindered amine light stabilizer: 0.3 - 0.5 parts; Flame retardant: 3 - 6 parts.

5. A three-layer co-pressed gable tile according to claim 1, characterized in that: The adhesive layer is composed of one or more of PMMA resin, EVA hot melt adhesive, PVB hot melt adhesive, and polyolefin hot melt adhesive.

6. The three-layer co-pressed gable tile according to claim 4, characterized in that: The ultraviolet absorber is one or more of phenyl salicylate, 2,4-dihydroxybenzophenone, and 2-hydroxy-4-n-octyloxybenzophenone, and the flame retardant is selected from one or more of decabromodiphenyl ether, tetrabromobisphenol A, and magnesium chloride.

7. A three-layer co-pressed gable tile according to claim 1, characterized in that: The stabilizer is selected from one or more of dibasic lead phosphite stabilizer, dibasic lead stearate stabilizer, and tribasic lead sulfate stabilizer.

8. A three-layer co-pressed wall tile according to claim 1, characterized in that: The average particle size of the hollow ceramic microspheres is 10 - 30 μm.

9. A preparation method of a three-layer co-pressed gable tile, characterized in that, It includes the following steps: Mixing: The surface layer, the adhesive layer, and the base material layer are respectively mixed and stirred according to the formula to ensure uniform mixing of the materials; Pelletizing: The uniformly mixed materials of the surface layer, the adhesive layer, and the base material layer are respectively pelletized at a temperature of 170 - 220 °C; Plasticization: The pelletized surface layer, adhesive layer, and base material layer are respectively plasticized under the condition of a temperature of 180 - 230 °C; Coextrusion: The materials of the surface layer, the adhesive layer, and the base material layer are dried, and then conveyed to a coextrusion die through an extruder to be extruded and stacked in sequence; Pressing: The stacked surface layer, adhesive layer, and base material layer are pressed into shape through a pressing die, and after cooling and shaping, they are cut to obtain a three-layer co-pressed wall tile.

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