Bionic impact-resistant pp plastic plate and preparation method thereof

Abstract

The application provides a kind of bionic impact-resistant PP plastic plate, the PP plastic plate includes surface layer, core layer and inner layer, the hardness of the inner layer is greater than the hardness of surface layer, the hardness of surface layer is greater than the hardness of core layer, the surface layer is PP / POE composite board, the inner layer is PP board, and the core layer is elastic PP board.The bionic impact-resistant PP plastic plate of the application can obtain a full-PP plate by compounding the matrix and the reinforcing body made of the same kind of PP, which has excellent mechanical properties, light weight, wide recycling range and other advantages.

Description

Technical Field

[0001] This invention relates to the field of polymer materials, specifically to a biomimetic impact-resistant PP plastic sheet and its preparation method. Background Technology

[0002] Polypropylene (PP), one of the most widely used thermoplastics, is currently the second most widely used general-purpose thermoplastic resin after polyethylene. It boasts numerous advantages, including high strength, good wear resistance, light weight, low cost, easy molding, and abundant raw material sources. However, its disadvantages include relatively low impact strength, typically requiring composite reinforcement with glass fiber, carbon fiber, ceramic fiber, etc., to meet the requirements of applications in the automotive, home appliance, and construction industries. During use, these composite materials are prone to fiber breakage and detachment due to wear and aging, making them unsuitable for applications requiring high toughness. Furthermore, recycling is difficult because it involves complete separation of the matrix from the fibers, and the recycling process inevitably has some environmental impact, limiting the reuse rate and scope. Summary of the Invention

[0003] The technical problem to be solved: The purpose of this invention is to provide a biomimetic impact-resistant PP plastic sheet. By using the same type of PP matrix and reinforcement to composite, a full PP sheet can be obtained, which has the advantages of excellent mechanical properties, light weight, and wide recyclability.

[0004] Technical solution: A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer, a core layer and an inner layer, wherein the hardness of the inner layer is greater than that of the surface layer, the hardness of the surface layer is greater than that of the core layer, the surface layer is a PP / POE composite board, the inner layer is a PP board, and the core layer is an elastic PP board.

[0005] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0006] S1. Preparation of the inner layer: PP granules are pressed into thin plates with a thickness of 1-3mm using a flat vulcanizing machine;

[0007] S2. Preparation of the surface layer: PP and POE are mixed in proportion and dried, then mixed and granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into thin sheets with a thickness of 1-3 mm by a flat vulcanizing machine.

[0008] S3. Core layer preparation: Elastic PP granules are pressed into thin plates with a thickness of 2-4mm using a flat vulcanizing machine;

[0009] S4. Preparation of biomimetic PP plastic sheet: The core layer is placed between the inner and outer thin sheets, and hot-pressed under a certain hot-pressing temperature and pressure to obtain the biomimetic PP plastic sheet.

[0010] Preferably, the mass ratio of PP to POE in step S2 is 100:5-8.

[0011] Preferably, the method for preparing the elastic PP granules in step S3 includes the following steps:

[0012] S11. Add methyltrimethoxysilane and dimethyldiethoxysilane to a mixed solution of acidic alcohol and water, and hydrolyze to obtain a sol. The molar ratio of methyltrimethoxysilane:dimethyldiethoxysilane:ethanol:water:DMF:hydrochloric acid is 1:0.05-0.08:7-8:8-10:0.75-0.82:0.4-0.45.

[0013] S12. Add submicron / nano-sized rubber particles to the sol prepared in step S11 and stir until homogeneous. While stirring, add ammonia dropwise until a gel is formed. Place the gel in ethanol for aging. After aging, perform solution replacement to obtain an aged gel. S13. Divide the aged gel prepared in step S12 into particles with a particle size of 2-3 mm. Dry the gel particles to obtain silica aerogel.

[0014] S14. The silica aerogel prepared in step S13 is premixed with PP particles, and then extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

[0015] Preferably, the aging temperature in step S12 is 50-60℃ and the aging time is 24-72h.

[0016] Ideally, in step S12, the mass ratio of submicro / nano-sized rubber particles to sol is 2-3:10.

[0017] The selected drying parameters in step S13 are: first, dry at 30℃ for 2-4 hours, then at 50℃ for 6-10 hours, and finally at 85℃ for 5-10 hours.

[0018] Preferably, in step S14, the mass ratio of silica aerogel to PP particles is 5-8:100.

[0019] Preferably, in step S3, the hot pressing temperature is 150-180℃ and the hot pressing pressure is 5-10MPa.

[0020] Beneficial effects: The present invention has the following advantages:

[0021] 1. In this invention, the PP sheet is composed of three thin sheets, including a surface layer, a core layer, and an inner layer. The three layers have different degrees of toughness, with the core layer being the softest, followed by the surface layer, and finally the inner layer. The composite of these three thin sheets with different toughness structures forms the PP sheet. This structure is similar to the three-layer structure of a seashell. The three-layer biomimetic structure of this invention can improve the impact resistance of the PP sheet. 2. In this invention, the core layer is prepared by blending elastic silica aerogel with PP particles. Submicron / nano-sized rubber particles are added to the silica sol. The rubber particles are embedded in the silica aerogel in a granular form. When mixed and melted with PP and extruded, the rubber particles change from a solid state to a liquid or viscoelastic state, mixing with the PP interface and increasing the elasticity of the core layer. Detailed Implementation

[0022] The present invention will be further described below with reference to embodiments. These embodiments are illustrative of the present invention, but the present invention is not limited to these embodiments:

[0023] Example 1

[0024] A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer, a core layer and an inner layer, wherein the hardness of the inner layer is greater than that of the surface layer, the hardness of the surface layer is greater than that of the core layer, the surface layer is a PP / POE composite board, the inner layer is a PP board, and the core layer is an elastic PP board.

[0025] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0026] S1. Preparation of the inner layer: PP granules are pressed into a thin plate with a thickness of 1.5mm using a flat vulcanizing machine;

[0027] S2. Preparation of the surface layer: PP and POE are mixed in a certain proportion and dried. The mass ratio of PP to POE is 100:5. The mixture is granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into thin sheets with a thickness of 3mm by a flat vulcanizing machine.

[0028] S3. Core layer preparation: Elastic PP granules are pressed into a thin plate with a thickness of 2mm using a flat vulcanizing machine;

[0029] S4. Preparation of biomimetic PP plastic sheet: The core layer is placed between the inner and outer thin sheets and hot-pressed at a temperature of 150℃ and a pressure of 10MPa to obtain the biomimetic PP plastic sheet.

[0030] The preparation method of elastic PP granules in step S3 includes the following steps:

[0031] S11. Add methyltrimethoxysilane and dimethyldiethoxysilane to a mixed solution of acidic alcohol and water, and hydrolyze to obtain a sol. The molar ratio of methyltrimethoxysilane:dimethyldiethoxysilane:ethanol:water:DMF:hydrochloric acid is 1:0.05:7:8:0.75:0.4.

[0032] S12. After adding submicron / nano-sized natural rubber particles to the sol prepared in step S11 and stirring evenly, the mass ratio of submicron / nano-sized rubber particles to sol is 2:10. While stirring, ammonia water is added dropwise until a gel is formed. The gel is then aged in ethanol at 50°C for 72 hours. After aging, the solution is replaced to obtain an aged gel. S13. The aged gel prepared in step S12 is divided into particles with a particle size of 3 mm. The gel particles are dried first at 30°C for 2 hours, then at 50°C for 6 hours, and finally at 85°C for 5 hours to obtain silica aerogel.

[0033] S14. The silica aerogel prepared in step S13 is premixed with PP particles at a mass ratio of 5:100. After mixing, the mixture is extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

[0034] Example 2

[0035] A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer, a core layer and an inner layer, wherein the hardness of the inner layer is greater than that of the surface layer, the hardness of the surface layer is greater than that of the core layer, the surface layer is a PP / POE composite board, the inner layer is a PP board, and the core layer is an elastic PP board.

[0036] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0037] S1. Preparation of the inner layer: PP granules are pressed into a thin plate with a thickness of 1.5mm using a flat vulcanizing machine;

[0038] S2. Preparation of the surface layer: PP and POE are mixed in a certain proportion and dried. The mass ratio of PP to POE is 100:8. The mixture is granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into thin sheets with a thickness of 2mm by a flat vulcanizing machine.

[0039] S3. Core layer preparation: Elastic PP granules are pressed into a thin plate with a thickness of 3mm using a flat vulcanizing machine;

[0040] S4. Preparation of biomimetic PP plastic sheet: The core layer is placed between the inner and outer thin sheets and hot-pressed at a temperature of 180℃ and a pressure of 10MPa to obtain the biomimetic PP plastic sheet.

[0041] The preparation method of elastic PP granules in step S3 includes the following steps:

[0042] S11. Add methyltrimethoxysilane and dimethyldiethoxysilane to a mixed solution of acidic alcohol and water, and hydrolyze to obtain a sol. The molar ratio of methyltrimethoxysilane:dimethyldiethoxysilane:ethanol:water:DMF:hydrochloric acid is 1:0.08:8:10:0.82:0.45.

[0043] S12. After adding submicron / nano-sized natural rubber particles to the sol prepared in step S11 and stirring evenly, the mass ratio of submicron / nano-sized rubber particles to sol is 3:10. While stirring, ammonia water is added dropwise until a gel is formed. The gel is then aged in ethanol at 60℃ for 24 hours. After aging, the solution is replaced to obtain an aged gel. S13. The aged gel prepared in step S12 is divided into particles with a particle size of 3 mm. The gel particles are dried first at 30℃ for 4 hours, then at 50℃ for 10 hours, and finally at 85℃ for 10 hours to obtain silica aerogel.

[0044] S14. The silica aerogel prepared in step S13 is premixed with PP particles. The mass ratio of silica aerogel to PP particles is 8:100. After mixing, the mixture is extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

[0045] Example 3

[0046] A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer, a core layer and an inner layer, wherein the hardness of the inner layer is greater than that of the surface layer, the hardness of the surface layer is greater than that of the core layer, the surface layer is a PP / POE composite board, the inner layer is a PP board, and the core layer is an elastic PP board.

[0047] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0048] S1. Preparation of the inner layer: PP granules are pressed into a thin plate with a thickness of 2mm using a flat vulcanizing machine;

[0049] S2. Preparation of the surface layer: PP and POE are mixed in a certain proportion and dried. The mass ratio of PP to POE is 100:7. The mixture is granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into thin sheets with a thickness of 1.5 mm by a flat vulcanizing machine.

[0050] S3. Core layer preparation: Elastic PP granules are pressed into a thin plate with a thickness of 2.5mm using a flat vulcanizing machine;

[0051] S4. Preparation of biomimetic PP plastic sheet: The core layer is placed between the inner and outer thin sheets and hot-pressed at a temperature of 160℃ and a pressure of 9MPa to obtain the biomimetic PP plastic sheet.

[0052] The preparation method of elastic PP granules in step S3 includes the following steps:

[0053] S11. Add methyltrimethoxysilane and dimethyldiethoxysilane to a mixed solution of acidic alcohol and water, and hydrolyze to obtain a sol. The molar ratio of methyltrimethoxysilane:dimethyldiethoxysilane:ethanol:water:DMF:hydrochloric acid is 1:0.06:7:8:0.76:0.42.

[0054] S12. After adding submicron / nano-sized natural rubber particles to the sol prepared in step S11 and stirring evenly, the mass ratio of submicron / nano-sized rubber particles to sol is 2.2:10. While stirring, ammonia water is added dropwise until a gel is formed. The gel is then aged in ethanol at 50°C for 50 hours. After aging, the solution is replaced to obtain the aged gel. S13. The aged gel prepared in step S12 is divided into particles with a particle size of 3 mm. The gel particles are dried first at 30°C for 4 hours, then at 50°C for 7 hours, and finally at 85°C for 8 hours to obtain silica aerogel.

[0055] S14. The silica aerogel prepared in step S13 is premixed with PP particles. The mass ratio of silica aerogel to PP particles is 5.5:100. After mixing, the mixture is extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

[0056] Example 4

[0057] A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer, a core layer and an inner layer, wherein the hardness of the inner layer is greater than that of the surface layer, the hardness of the surface layer is greater than that of the core layer, the surface layer is a PP / POE composite board, the inner layer is a PP board, and the core layer is an elastic PP board.

[0058] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0059] S1. Preparation of the inner layer: PP granules are pressed into a thin plate with a thickness of 2mm using a flat vulcanizing machine;

[0060] S2. Preparation of the surface layer: PP and POE are mixed in a certain proportion and dried. The mass ratio of PP to POE is 100:6. The mixture is granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into thin sheets with a thickness of 1.5 mm by a flat vulcanizing machine.

[0061] S3. Core layer preparation: Elastic PP granules are pressed into a thin plate with a thickness of 2.5mm using a flat vulcanizing machine;

[0062] S4. Preparation of biomimetic PP plastic sheet: The core layer is placed between the inner layer and the outer layer thin sheet, and hot pressing is performed at a temperature of 170℃ and a pressure of 8MPa to obtain the biomimetic PP plastic sheet.

[0063] The preparation method of elastic PP granules in step S3 includes the following steps:

[0064] S11. Add methyltrimethoxysilane and dimethyldiethoxysilane to a mixed solution of acidic alcohol and water, and hydrolyze to obtain a sol. The molar ratio of methyltrimethoxysilane:dimethyldiethoxysilane:ethanol:water:DMF:hydrochloric acid is 1:0.07:8:10:0.8:0.44.

[0065] S12. Add submicron / nano-sized natural rubber particles to the sol prepared in step S11 and stir until homogeneous. The mass ratio of submicron / nano-sized rubber particles to sol is 2.8:10. While stirring, add ammonia dropwise until a gel is formed. Place the gel in ethanol for aging at 60℃ for 30 hours. After aging, perform solution displacement to obtain the aged gel. S13. Divide the aged gel prepared in step S12 into particles with a particle size of 2 mm. Dry the gel particles by drying at 30℃ for 3 hours, 50℃ for 9 hours, and 85℃ for 6 hours to obtain silica aerogel.

[0066] S14. The silica aerogel prepared in step S13 is premixed with PP particles. The mass ratio of silica aerogel to PP particles is 7.5:100. After mixing, the mixture is extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

[0067] Example 5

[0068] A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer, a core layer and an inner layer, wherein the hardness of the inner layer is greater than that of the surface layer, the hardness of the surface layer is greater than that of the core layer, the surface layer is a PP / POE composite board, the inner layer is a PP board, and the core layer is an elastic PP board.

[0069] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0070] S1. Preparation of the inner layer: PP granules are pressed into a thin plate with a thickness of 2mm using a flat vulcanizing machine;

[0071] S2. Preparation of the surface layer: PP and POE are mixed in a certain proportion and dried. The mass ratio of PP to POE is 100:6.5. The mixture is then granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into thin sheets with a thickness of 2 mm using a flat vulcanizing machine. S3. Preparation of the core layer: Elastic PP granules are pressed into thin sheets with a thickness of 2 mm using a flat vulcanizing machine.

[0072] S4. Preparation of biomimetic PP plastic sheet: The core layer is placed between the inner and outer thin sheets and hot-pressed at a temperature of 165℃ and a pressure of 8MPa to obtain the biomimetic PP plastic sheet.

[0073] The preparation method of elastic PP granules in step S3 includes the following steps:

[0074] S11. Methyltrimethoxysilane and dimethyldiethoxysilane are added to a mixed solution of acidic alcohol and water, and hydrolyzed to obtain a sol. The molar ratio of methyltrimethoxysilane:dimethyldiethoxysilane:ethanol:water:DMF:hydrochloric acid is 1:0.06:7.5:9:0.78:0.41.

[0075] S12. After adding submicron / nano-sized natural rubber particles to the sol prepared in step S11 and stirring evenly, the mass ratio of submicron / nano-sized rubber particles to sol is 2.5:10. While stirring, ammonia water is added dropwise until a gel is formed. The gel is then aged in ethanol at 55℃ for 40 hours. After aging, the solution is replaced to obtain the aged gel. S13. The aged gel prepared in step S12 is divided into particles with a particle size of 2.5 mm. The gel particles are dried first at 30℃ for 3 hours, then at 50℃ for 7 hours, and finally at 85℃ for 7 hours to obtain silica aerogel.

[0076] S14. The silica aerogel prepared in step S13 is premixed with PP particles. The mass ratio of silica aerogel to PP particles is 6:100. After mixing, the mixture is extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

[0077] Comparative Example 1

[0078] A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer and an inner layer, wherein the hardness of the inner layer is greater than that of the surface layer, the surface layer is a PP / POE composite board, and the inner layer is a PP board;

[0079] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0080] S1. Preparation of the inner layer: PP granules are pressed into a thin plate with a thickness of 3mm using a flat vulcanizing machine;

[0081] S2. Preparation of the surface layer: PP and POE are mixed in a certain proportion and dried. The mass ratio of PP to POE is 100:7. The mixture is granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into thin sheets with a thickness of 3mm by a flat vulcanizing machine.

[0082] Preparation of S3.PP plastic sheet: The inner layer and the outer layer are laminated and hot-pressed at a temperature of 160℃ and a pressure of 9MPa to obtain a biomimetic PP plastic sheet.

[0083] Comparative Example 2

[0084] A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer and an inner layer, wherein the hardness of the surface layer is greater than that of the inner layer, the surface layer is a PP / POE composite board, and the inner layer is an elastic PP board;

[0085] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0086] S1. Preparation of the outer layer: PP and POE are mixed in a certain proportion and dried. The mass ratio of PP to POE is 100:6.5. The mixture is then granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into a thin sheet with a thickness of 3mm using a flat vulcanizing machine. S2. Preparation of the inner layer: Elastic PP granules are pressed into a thin sheet with a thickness of 3mm using a flat vulcanizing machine.

[0087] Preparation of S3.PP plastic sheet: The inner layer and the outer layer of thin sheet are hot-pressed together at a temperature of 165℃ and a pressure of 8MPa to obtain a biomimetic PP plastic sheet.

[0088] The preparation method of the elastic PP granules in step S2 includes the following steps:

[0089] S11. Methyltrimethoxysilane and dimethyldiethoxysilane are added to a mixed solution of acidic alcohol and water, and hydrolyzed to obtain a sol. The molar ratio of methyltrimethoxysilane:dimethyldiethoxysilane:ethanol:water:DMF:hydrochloric acid is 1:0.06:7.5:9:0.78:0.41.

[0090] S12. After adding submicron / nano-sized natural rubber particles to the sol prepared in step S11 and stirring evenly, the mass ratio of submicron / nano-sized rubber particles to sol is 2.5:10. While stirring, ammonia water is added dropwise until a gel is formed. The gel is then aged in ethanol at 55℃ for 40 hours. After aging, the solution is replaced to obtain the aged gel. S13. The aged gel prepared in step S12 is divided into particles with a particle size of 2.5 mm. The gel particles are dried first at 30℃ for 3 hours, then at 50℃ for 7 hours, and finally at 85℃ for 7 hours to obtain silica aerogel.

[0091] S14. The silica aerogel prepared in step S13 is premixed with PP particles. The mass ratio of silica aerogel to PP particles is 6:100. After mixing, the mixture is extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

[0092] Comparative Example 3

[0093] A biomimetic impact-resistant PP plastic sheet, the PP plastic sheet comprising a surface layer, a core layer and an inner layer, wherein the hardness of the inner layer is greater than that of the surface layer, the hardness of the surface layer is greater than that of the core layer, the surface layer is a PP / POE composite board, the inner layer is a PP board, and the core layer is an elastic PP board.

[0094] The above-mentioned method for preparing biomimetic impact-resistant PP plastic sheets includes the following steps:

[0095] S1. Preparation of the inner layer: PP granules are pressed into a thin plate with a thickness of 2mm using a flat vulcanizing machine;

[0096] S2. Preparation of the surface layer: PP and POE are mixed in a certain proportion and dried. The mass ratio of PP to POE is 100:7. The mixture is granulated in an extruder to obtain PP / POE granules. The PP / POE granules are then pressed into thin sheets with a thickness of 1.5 mm by a flat vulcanizing machine.

[0097] S3. Core layer preparation: Elastic PP granules are pressed into a thin plate with a thickness of 2.5mm using a flat vulcanizing machine;

[0098] S4. Preparation of biomimetic PP plastic sheet: The core layer is placed between the inner and outer thin sheets and hot-pressed at a temperature of 160℃ and a pressure of 9MPa to obtain the biomimetic PP plastic sheet.

[0099] The preparation method of elastic PP granules in step S3 includes the following steps:

[0100] S11. Add methyltrimethoxysilane and dimethyldiethoxysilane to a mixed solution of acidic alcohol and water, and hydrolyze to obtain a sol. The molar ratio of methyltrimethoxysilane:dimethyldiethoxysilane:ethanol:water:DMF:hydrochloric acid is 1:0.06:7:8:0.76:0.42.

[0101] S12. While stirring, ammonia water is added dropwise to the sol prepared in step S11 until a gel is formed. The gel is then aged in ethanol at a temperature of 50°C for 50 hours. After aging, the solution is replaced to obtain the aged gel.

[0102] S13. The aged gel prepared in step S12 is divided into particles with a particle size of 3 mm. The gel particles are dried first at 30°C for 4 h, then at 50°C for 7 h, and then at 85°C for 8 h to obtain silica aerogel.

[0103] S14. The silica aerogel prepared in step S13 is premixed with PP particles. The mass ratio of silica aerogel to PP particles is 5.5:100. After mixing, the mixture is extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

[0104] Tensile property test: Tested according to ASTM D 3039-507. The length × width of the specimen is 100 mm × 12 mm, the thickness is the original thickness of the plate, the tensile speed is 2 mm / min, and the gauge length is 60 mm.

[0105] Bending strength test: Tested according to GB / T 3356—2014, using the three-point bending mode, the length × width of the sample is 100mm × 12mm, the thickness is the original thickness of the plate, the bending loading speed is 2mm / min, and the span is 40mm.

[0106] Low-temperature impact strength: tested according to GB / T 1043.1—2008.

[0107] Tensile strength (MPa) Bending strength (MPa) <![CDATA[Impact strength (kJ / m 2 )]]> Example 1 252 129 126 Example 2 228 125 132 Example 3 244 132 135 Example 4 239 131 129 Example 5 255 128 133 Comparative Example 1 133 106 95 Comparative Example 2 192 99 99 Comparative Example 3 201 108 110

[0108] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing a bionic impact-resistant PP plastic plate, the PP plastic plate comprising a surface layer, a core layer and an inner layer, the hardness of the inner layer being greater than the hardness of the surface layer, and the hardness of the surface layer being greater than the hardness of the core layer, the surface layer being a PP / POE composite plate, the inner layer being a PP plate, and the core layer being an elastic PP plate, characterized in that, The method comprises the following steps: ​ S1. Preparation of the inner layer: PP granules are pressed into a sheet with a thickness of 1-3 mm by a flat vulcanizing machine; S2. Preparation of the surface layer: PP and POE are mixed in proportion, dried, and then granulated in an extruder to obtain PP / POE granules, which are pressed into a sheet with a thickness of 1-3 mm by a flat vulcanizing machine; S3. Preparation of the core layer: elastic PP granules are pressed into a sheet with a thickness of 2-4 mm by a flat vulcanizing machine; S4. Preparation of the biomimetic PP plastic plate: the core layer is placed between the inner layer and the surface layer, and hot pressing is performed at a certain hot pressing temperature and pressure to obtain the biomimetic PP plastic plate; The preparation method of the elastic PP granules in step S3 comprises the following steps: S11. Methyltrimethoxysilane and dimethyldiethoxysilane are added to a mixed solution of acidic alcohol and water, and after hydrolysis, a sol is obtained, the molar ratio of methyltrimethoxysilane: dimethyldiethoxysilane: ethanol: water: DMF: hydrochloric acid is 1: 0.05-0.08: 7-8: 8-10: 0.75-0.82: 0.4-0.45; S12. After the sol prepared in step S11 is stirred uniformly with sub-micro / nano-sized rubber particles, ammonia water is added dropwise while stirring until a gel is formed, and the gel is aged in ethanol, and after aging, solution replacement is performed to obtain an aged gel; S13. The aged gel prepared in step S12 is divided into particles with a particle size of 2-3 mm, and the gel particles are dried to obtain silica aerogel; S14. The silica aerogel prepared in step S13 is pre-mixed with PP particles, and then extruded and granulated on a twin-screw extruder to obtain elastic PP granules.

2. The method of claim 1, wherein the method further comprises the step of: 2.

1. adding 0.1-0.5 wt% of a cross-linking agent to the mixture of step 1.

1. The mass ratio of PP to POE in step S2 is 100:5-8.

3. The method of claim 1, wherein the method further comprises the step of: 3.

1. adding 0.1-0.5 wt% of a cross-linking agent to the mixture of step 2.

1. The aging temperature in step S12 is 50-60℃, and the aging time is 24-72h.

4. The method of claim 1, wherein the method further comprises the step of: 4-1) adding 0.1-0.5 wt% of a coupling agent to the mixture of step 3-1) and mixing the mixture for 1-3 hours. The mass ratio of sub-micro / nano-sized rubber particles to sol in step S12 is 2-3:

10.

5. The method of claim 1, wherein the method further comprises the step of: 5.

1. adding 0.1-0.5 wt% of a coupling agent to the mixture of step 1.

2. The drying parameters in step S13 are: first dried at 30℃ for 2-4h, then dried at 50℃ for 6-10h, and finally dried at 85℃ for 5-10h.

6. The method of claim 1, wherein the method further comprises the step of: 6.

1. adding 0.1-0.5 wt% of a cross-linking agent to the mixture of step 1.

2. The mass ratio of silica aerogel to PP particles in step S14 is 5-8:

100.

7. The method of claim 1, wherein the method further comprises the step of: The hot pressing temperature in step S3 is 150-180℃, and the hot pressing pressure is 5-10MPa. ​