High-strength and high-toughness PVC profile and preparation method thereof

Abstract

The application provides a high-strength and high-toughness PVC profile and a preparation method thereof. The high-strength and high-toughness PVC profile comprises a first high-strength layer, a first fiber layer, a PVC layer, a second fiber layer and a second high-strength layer in sequence. The first high-strength layer and the second high-strength layer each comprise the following components in parts by weight: PVC resin 100-150 parts, calcium-zinc stabilizer 3-5 parts, reinforcing particles 15-20 parts, internal lubricant 0.5 part, external lubricant 0.5 part and stearic acid 0.2 part. The reinforcing particles are modified waste rubber particles. The first fiber layer and the second fiber layer are formed by rolling PVC slurry on fiber fabric, so that the comprehensive performance of the PVC profile is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of PVC foam materials technology, specifically to a high-strength, high-toughness PVC profile and its preparation method. Background Technology

[0002] Polyvinyl chloride (PVC) resin is a thermoplastic polymer compound produced by free radical polymerization of vinyl chloride monomer. It is the second most produced general-purpose plastic after polyethylene (PE), possessing excellent properties such as high rigidity, high strength, flame retardancy, corrosion resistance, and good electrical insulation, and is relatively inexpensive, making it widely used in industry, agriculture, defense, and construction. However, rigid PVC's poor toughness and low impact strength limit its applications in many areas. Given the shortcomings of PVC sheets and the need to develop PVC building materials that meet specific performance requirements, modifying PVC to improve its overall performance is of great significance. Currently, toughening modification of PVC typically involves adding inorganic rigid particles. This method of modifying PVC materials using inorganic nanoparticles usually has the following drawbacks: inorganic nanoparticles themselves tend to aggregate, resulting in uneven dispersion in the polymer matrix, existing as numerous aggregates that cannot fully form a transport network and thus fail to play their intended role. The high cost of some inorganic nanoparticles (such as graphene and carbon nanotubes) makes PVC materials too expensive, limiting their application in actual production. Therefore, a high-strength and high-toughness PVC profile is proposed to improve the overall performance of PVC profiles and enable them to better adapt to different working environments. Summary of the Invention

[0003] The purpose of this invention is to provide a high-strength and high-toughness PVC profile and its preparation method, which improves the overall performance of PVC and is simple and easy to implement.

[0004] To achieve the above objectives, the present invention provides a high-strength and high-toughness PVC profile, which sequentially comprises a first high-strength layer, a first fiber layer, a PVC layer, a second fiber layer, and a second high-strength layer. Both the first and second high-strength layers comprise the following components in parts by weight: 100-150 parts PVC resin, 3-5 parts calcium-zinc stabilizer, 15-20 parts reinforcing particles, 0.5 parts internal lubricant, 0.5 parts external lubricant, and 0.2 parts stearic acid; the reinforcing particles are modified waste rubber particles. The first and second fiber layers are formed by roller coating PVC slurry onto fiber fabric, and the PVC slurry comprises the following components in parts by weight: 120-150 parts PVC resin, 2-4 parts calcium-zinc stabilizer, and 30-40 parts diisononyl phthalate. The PVC layer comprises the following components in parts by weight: 90-110 parts PVC resin, 12-17 parts light calcium carbonate, 5-10 parts calcium-zinc stabilizer, 1-3 parts plasticizer, 0.5-1 part internal lubricant, 0.5-1 part external lubricant, 0.1-0.2 parts stearic acid, and 8-14 parts zinc stannate.

[0005] Preferably, the modified waste rubber particles are obtained by impregnating the waste rubber particles with 0.5 g / L dopamine for 1-2 hours and then pre-coating them with PVC resin.

[0006] Preferably, the waste rubber particles are 200-300 mesh in size.

[0007] Preferably, the fiber fabric includes a first polyester fabric and a second polyester fabric, the first polyester fabric and the second polyester fabric are unidirectional fabrics, and the fiber directions of the first polyester fabric and the second polyester fabric are at 90°.

[0008] Preferably, the fiber fabric includes a first carbon fiber unidirectional fabric and a second carbon fiber unidirectional fabric, wherein the fiber directions of the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are at 90°.

[0009] Preferably, the PVC layer comprises the following components in parts by weight: 100 parts PVC resin, 15 parts light calcium carbonate, 7 parts calcium-zinc stabilizer, 2 parts plasticizer, 0.5 parts internal lubricant, 0.5 parts external lubricant, 0.2 parts stearic acid, and 10 parts zinc stannate; the plasticizer is trioctyl trimellitate, the internal lubricant is internal lubricant G60, and the external lubricant is polyethylene wax.

[0010] This invention also provides a method for preparing high-strength and high-toughness PVC profiles, comprising the following steps:

[0011] Step 1: Preparation of the first and second fiber fabrics: The PVC resin, calcium zinc stabilizer and diisononyl phthalate in the formula amount are heated and sheared to obtain PVC slurry. Then, the PVC slurry is rolled onto the fiber fabric using a coating machine. After pre-drying in an oven at 100-130℃ for 3 minutes, it is plasticized and molded at 180℃ to obtain the first and second fiber fabrics respectively.

[0012] Step 2: Prepare the high-strength layer slurry required for the first and second high-strength layers: Heat and shear plasticize the formulated amounts of PVC resin, calcium-zinc stabilizer, internal lubricant, external lubricant and stearic acid to obtain a pre-slurry, then add modified waste rubber particles and continue stirring until the modified waste rubber particles are fully dispersed in the pre-slurry to obtain the high-strength layer slurry;

[0013] Step 3: Preparation of PVC layer slurry: The PVC layer slurry is prepared by heating and shearing the formulated amounts of PVC resin, light calcium carbonate, calcium-zinc stabilizer, plasticizer, internal lubricant, external lubricant, stearic acid, and zinc stannate.

[0014] Step 4: Prepare PVC sheet: Extrude the high-strength layer slurry into the mold through an extruder, then place the second fiber cloth, extrude the PVC layer slurry into the mold above the second fiber cloth through an extruder, then place the first fiber cloth, then extrude the high-strength layer slurry into the mold above the first fiber cloth through an extruder, finally press and shape, cool and demold to obtain PVC profile.

[0015] Preferably, the preparation steps of the modified waste rubber particles are as follows: the waste rubber particles are immersed in a 0.5 g / L dopamine solution for 1 hour and then taken out. The PVC resin is hot-melted and sheared into a melt and then sprayed out so that the PVC resin is uniformly attached to the outer surface of the waste rubber particles to obtain modified waste rubber particles.

[0016] Preferably, the fiber fabric includes a first polyester fabric and a second polyester fabric. First, the first polyester fabric and the second polyester fabric are respectively coated with PVC slurry by roller. Then, the first polyester fabric and the second polyester fabric are stacked and pressed together at an angle, and plasticized after pre-drying.

[0017] Preferably, the fiber fabric includes a first carbon fiber unidirectional fabric and a second carbon fiber unidirectional fabric. First, the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are respectively coated with PVC slurry by roller. Then, the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are stacked and pressed together at an angle, and then plasticized and molded after pre-baking.

[0018] The beneficial effects of this invention are as follows: This invention provides a high-strength and high-toughness PVC profile. The performance of the PVC profile is effectively improved by sequentially adding a first high-strength layer, a first fiber layer, a PVC layer, a second fiber layer, and a second high-strength layer. The first and second high-strength layers, by adding modified waste rubber particles, improve the wear resistance, strength, and toughness of the outer layer of the PVC profile. Compared to the common method of adding rigid particles, using waste rubber particles is environmentally friendly and inexpensive. The first and second fiber layers incorporate fiber fabric to enhance the overall high toughness of the PVC. The fiber fabric has good strength and bending properties, effectively preventing the PVC profile from breaking under excessive stress. This invention also provides a high-strength and high-toughness PVC profile with a simple preparation method that is easy to implement on a large scale. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of a high-strength and high-toughness PVC profile.

[0020] In the diagram: 1-First high-strength layer, 2-First fiber layer, 3-PVC layer, 4-Second fiber layer, 5-Second high-strength layer. Detailed Implementation

[0021] The embodiments described below are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Example 1

[0022] This embodiment provides a high-strength, high-toughness PVC profile, which sequentially comprises a first high-strength layer 1, a first fiber layer 2, a PVC layer 3, a second fiber layer 4, and a second high-strength layer 5. Both the first and second high-strength layers comprise the following components in parts by weight: 100 parts PVC resin, 3 parts calcium-zinc stabilizer, 15 parts reinforcing particles, 0.5 parts internal lubricant, 0.5 parts external lubricant, and 0.2 parts stearic acid. The reinforcing particles are modified waste rubber particles, obtained by impregnating waste rubber particles with 0.5 g / L dopamine for 2 hours, followed by pre-coating with PVC resin. The waste rubber particles are 200 mesh in size.

[0023] The first fiber layer and the second fiber layer are formed by roller coating PVC slurry onto the fiber fabric. The PVC slurry comprises the following components in parts by weight: 120 parts PVC resin, 2 parts calcium zinc stabilizer, and 30 parts diisononyl phthalate.

[0024] The PVC layer comprises the following components in parts by weight: 90 parts PVC resin, 12 parts light calcium carbonate, 5 parts calcium-zinc stabilizer, 1 part plasticizer, 0.5 parts internal lubricant, 0.5 parts external lubricant, 0.1 parts stearic acid, and 8 parts zinc stannate.

[0025] The fiber fabric includes a first polyester fabric and a second polyester fabric, the first polyester fabric and the second polyester fabric are unidirectional fabrics, and the fiber directions of the first polyester fabric and the second polyester fabric are at 90°.

[0026] The above-mentioned high-strength and high-toughness PVC profiles include the following steps:

[0027] Step 1: Preparation of the first and second fiber fabrics: The PVC resin, calcium zinc stabilizer and diisononyl phthalate in the formula amount are heated and sheared to obtain PVC slurry. Then, the PVC slurry is rolled onto the fiber fabric using a coating machine. After pre-drying in an oven at 100-130℃ for 3 minutes, it is plasticized and molded at 180℃ to obtain the first and second fiber fabrics respectively.

[0028] Step 2: Prepare the high-strength layer slurry required for the first and second high-strength layers: Heat and shear plasticize the formulated amounts of PVC resin, calcium-zinc stabilizer, internal lubricant, external lubricant and stearic acid to obtain a pre-slurry, then add modified waste rubber particles and continue stirring until the modified waste rubber particles are fully dispersed in the pre-slurry to obtain the high-strength layer slurry;

[0029] Step 3: Preparation of PVC layer slurry: The PVC layer slurry is prepared by heating and shearing the formulated amounts of PVC resin, light calcium carbonate, calcium-zinc stabilizer, plasticizer, internal lubricant, external lubricant, stearic acid, and zinc stannate.

[0030] Step 4: Prepare PVC sheet: Extrude the high-strength layer slurry into the mold through an extruder, then place the second fiber cloth, extrude the PVC layer slurry into the mold above the second fiber cloth through an extruder, then place the first fiber cloth, then extrude the high-strength layer slurry into the mold above the first fiber cloth through an extruder, finally press and shape, cool and demold to obtain PVC profile.

[0031] The preparation steps of the modified waste rubber particles are as follows: the waste rubber particles are immersed in a 0.5 g / L dopamine solution for 1 hour and then taken out. The PVC resin is hot-melted and sheared into a melt and then sprayed out so that the PVC resin is evenly attached to the outer surface of the waste rubber particles to obtain the modified waste rubber particles.

[0032] The fiber fabric includes a first polyester fabric and a second polyester fabric. First, the first polyester fabric and the second polyester fabric are respectively coated with PVC slurry by roller. Then, the first polyester fabric and the second polyester fabric are stacked and pressed together at an angle, and plasticized after pre-drying. Example 2

[0033] This embodiment provides a high-strength, high-toughness PVC profile, which sequentially comprises a first high-strength layer 1, a first fiber layer 2, a PVC layer 3, a second fiber layer 4, and a second high-strength layer 5. Both the first and second high-strength layers comprise the following components in parts by weight: 100 parts PVC resin, 3 parts calcium-zinc stabilizer, 15 parts reinforcing particles, 0.5 parts internal lubricant, 0.5 parts external lubricant, and 0.2 parts stearic acid. The reinforcing particles are modified waste rubber particles, obtained by impregnating waste rubber particles with 0.5 g / L dopamine for 2 hours, followed by pre-coating with PVC resin. The waste rubber particles are 200 mesh in size.

[0034] The first fiber layer and the second fiber layer are formed by roller coating PVC slurry onto the fiber fabric. The PVC slurry comprises the following components in parts by weight: 120 parts PVC resin, 2 parts calcium zinc stabilizer, and 30 parts diisononyl phthalate.

[0035] The PVC layer comprises the following components in parts by weight: 90 parts PVC resin, 12 parts light calcium carbonate, 5 parts calcium-zinc stabilizer, 1 part plasticizer, 0.5 parts internal lubricant, 0.5 parts external lubricant, 0.1 parts stearic acid, and 8 parts zinc stannate.

[0036] The fiber fabric includes a first carbon fiber unidirectional fabric and a second carbon fiber unidirectional fabric, wherein the fiber directions of the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are at 90°.

[0037] The above-mentioned high-strength and high-toughness PVC profiles include the following steps:

[0038] Step 1: Preparation of the first and second fiber fabrics: The PVC resin, calcium zinc stabilizer and diisononyl phthalate in the formula amount are heated and sheared to obtain PVC slurry. Then, the PVC slurry is rolled onto the fiber fabric using a coating machine. After pre-drying in an oven at 100-130℃ for 3 minutes, it is plasticized and molded at 180℃ to obtain the first and second fiber fabrics respectively.

[0039] Step 2: Prepare the high-strength layer slurry required for the first and second high-strength layers: Heat and shear plasticize the formulated amounts of PVC resin, calcium-zinc stabilizer, internal lubricant, external lubricant and stearic acid to obtain a pre-slurry, then add modified waste rubber particles and continue stirring until the modified waste rubber particles are fully dispersed in the pre-slurry to obtain the high-strength layer slurry;

[0040] Step 3: Preparation of PVC layer slurry: The PVC layer slurry is prepared by heating and shearing the formulated amounts of PVC resin, light calcium carbonate, calcium-zinc stabilizer, plasticizer, internal lubricant, external lubricant, stearic acid, and zinc stannate.

[0041] Step 4: Prepare PVC sheet: Extrude the high-strength layer slurry into the mold through an extruder, then place the second fiber cloth, extrude the PVC layer slurry into the mold above the second fiber cloth through an extruder, then place the first fiber cloth, then extrude the high-strength layer slurry into the mold above the first fiber cloth through an extruder, finally press and shape, cool and demold to obtain PVC profile.

[0042] The preparation steps of the modified waste rubber particles are as follows: the waste rubber particles are immersed in a 0.5 g / L dopamine solution for 1 hour and then taken out. The PVC resin is hot-melted and sheared into a melt and then sprayed out so that the PVC resin is evenly attached to the outer surface of the waste rubber particles to obtain the modified waste rubber particles.

[0043] The fiber fabric includes a first carbon fiber unidirectional fabric and a second carbon fiber unidirectional fabric. First, the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are respectively coated with PVC slurry by roller. Then, the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are stacked and pressed together at an angle, and then plasticized and molded after pre-baking. Example 3

[0044] This embodiment provides a high-strength, high-toughness PVC profile. The difference between Embodiment 3 and Embodiment 2 is that both the first and second high-strength layers comprise the following components in parts by weight: 125 parts PVC resin, 4 parts calcium-zinc stabilizer, 18 parts reinforcing particles, 0.5 parts internal lubricant, 0.5 parts external lubricant, and 0.2 parts stearic acid. The reinforcing particles are modified waste rubber particles, obtained by impregnating the waste rubber particles with 0.5 g / L dopamine for 2 hours, followed by pre-coating with PVC resin. The waste rubber particles have a size of 250 mesh. Example 4

[0045] This embodiment provides a high-strength and high-toughness PVC profile. The difference between Embodiment 4 and Embodiment 2 is that the PVC layer includes the following components in parts by weight: 100 parts of PVC resin, 15 parts of light calcium carbonate, 7 parts of calcium-zinc stabilizer, 2 parts of plasticizer, 0.5 parts of internal lubricant, 0.5 parts of external lubricant, 0.2 parts of stearic acid, and 10 parts of zinc stannate. Example 5

[0046] This embodiment provides a PVC profile, which sequentially includes a first high-strength layer, a PVC layer, and a second high-strength layer.

[0047] Both the first high-strength layer and the second high-strength layer comprise the following components in parts by weight: 100 parts PVC resin, 3 parts calcium-zinc stabilizer, 15 parts reinforcing particles, 0.5 parts internal lubricant, 0.5 parts external lubricant, and 0.2 parts stearic acid. The reinforcing particles are modified waste rubber particles, obtained by impregnating the waste rubber particles with 0.5 g / L dopamine for 1-2 hours, followed by pre-coating with PVC resin. The waste rubber particles are 200 mesh in size.

[0048] The PVC layer comprises the following components in parts by weight: 100 parts PVC resin, 15 parts light calcium carbonate, 7 parts calcium-zinc stabilizer, 2 parts plasticizer, 0.5 parts internal lubricant, 0.5 parts external lubricant, 0.2 parts stearic acid, and 10 parts zinc stannate.

[0049] Compared to Example 2, the preparation steps of the PVC profile have reduced the manufacturing steps of the first fiber layer and the second fiber layer. Example 6

[0050] This embodiment provides a PVC profile, which sequentially comprises a first fiber layer, a PVC layer, and a second fiber layer. The first and second fiber layers are formed by roller coating a PVC slurry onto a fiber fabric. The PVC slurry comprises the following components in parts by weight: 120 parts PVC resin, 2 parts calcium-zinc stabilizer, and 30 parts diisononyl phthalate. The fiber fabric comprises a first unidirectional carbon fiber fabric and a second unidirectional carbon fiber fabric, wherein the fiber directions of the first and second unidirectional carbon fiber fabrics are at 90°.

[0051] Compared to Example 2, the preparation steps of the PVC profile have reduced the manufacturing steps of the first high-strength layer and the second high-strength layer. Example 7

[0052] This embodiment provides a PVC profile, which comprises the following components in parts by weight: 100 parts PVC resin, 15 parts light calcium carbonate, 7 parts calcium-zinc stabilizer, 2 parts plasticizer, 0.5 parts internal lubricant, 0.5 parts external lubricant, 0.2 parts stearic acid, and 10 parts zinc stannate.

[0053] The preparation steps of the PVC profile are as follows: The formulated amounts of PVC resin, light calcium carbonate, calcium-zinc stabilizer, plasticizer, internal lubricant, external lubricant, stearic acid, and zinc stannate are heated and sheared to obtain the PVC layer slurry. The PVC layer slurry is extruded into a mold through an extruder, pressed into shape, and cooled and demolded to obtain the PVC profile.

[0054] In all the above embodiments, the plasticizer is trioctyl trimellitate, the internal lubricant is internal lubricant G60, and the external lubricant is polyethylene wax.

[0055] The PVC profiles obtained in Examples 1-7 were subjected to performance testing. The test results are shown in Table 1:

[0056] Table 1 shows the test data of the PVC profiles prepared in Examples 1 to 7.

[0057] From the test data above, we can see that this invention uses a PVC layer as the main structural layer, with a first fiber layer and a second fiber layer distributed vertically. This improves the overall toughness of the PVC profile, making it less prone to breakage during use and adaptable to more demanding working environments. Furthermore, a first high-strength layer and a second high-strength layer are respectively set on the outer sides of the first and second fiber layers. Modified waste rubber particles are uniformly dispersed within these layers, significantly improving the material's stiffness, tensile strength, and modulus. Modifying the waste rubber particles greatly enhances their dispersibility in the slurry, preventing uneven distribution or even agglomeration that could cause stress concentration in the PVC profile, thus improving the overall strength of the PVC profile. Since the added waste rubber particles are too small, directly adding them to the slurry can easily cause agglomeration. Therefore, a pre-coating process is used before addition to form a coating layer on the surface of the waste rubber particles, enhancing the physical anchoring and bonding strength between the waste rubber particles and the PVC slurry, thereby improving the material's mechanical properties. Impregnation with dopamine solution can enhance the surface activity of waste rubber particles. Dopamine can undergo a self-polymerization reaction to generate a polydopamine coating containing many special functional groups (such as indole, catechol and amine groups), which can improve the bonding force between waste rubber particles and PVC resin during the pre-coating process.

[0058] The present invention has been described in detail above with reference to the embodiments. It should also be noted that the specific technical features described in the above embodiments can be combined and modified in any suitable manner without contradiction. The present invention will not further describe all possible combinations. Furthermore, other variations and combinations based on the various technical features of the present invention should also be considered as part of the content disclosed in this invention and fall within the protection scope of this invention.

Claims

1. A high-strength, high-toughness PVC profile, wherein the high-strength, high-toughness PVC profile sequentially comprises a first high-strength layer, a first fiber layer, a PVC layer, a second fiber layer, and a second high-strength layer, characterized in that, Both the first high-strength layer and the second high-strength layer comprise the following components in parts by weight: 100-150 parts PVC resin, 3-5 parts calcium-zinc stabilizer, 15-20 parts reinforcing particles, 0.5 parts internal lubricant, 0.5 parts external lubricant, and 0.2 parts stearic acid; the reinforcing particles are modified waste rubber particles that have been impregnated with dopamine and pre-coated with PVC; the first fiber layer and the second fiber layer are formed by roller coating PVC slurry onto fiber fabric. The slurry comprises the following components in parts by weight: 120-150 parts PVC resin, 2-4 parts calcium-zinc stabilizer, and 30-40 parts diisononyl phthalate; the PVC layer comprises the following components in parts by weight: 90-110 parts PVC resin, 12-17 parts light calcium carbonate, 5-10 parts calcium-zinc stabilizer, 1-3 parts plasticizer, 0.5-1 part internal lubricant, 0.5-1 part external lubricant, 0.1-0.2 parts stearic acid, and 8-14 parts zinc stannate.

2. The high-strength and high-toughness PVC profile according to claim 1, characterized in that: The modified waste rubber particles were obtained by impregnating the waste rubber particles with 0.5 g / L dopamine for 1-2 hours and then pre-coating them with PVC resin.

3. The high-strength and high-toughness PVC profile according to claim 2, characterized in that: The waste rubber particles are 200-300 mesh in size.

4. The high-strength and high-toughness PVC profile according to claim 1, characterized in that: The fiber fabric includes a first polyester fabric and a second polyester fabric. The first polyester fabric and the second polyester fabric are unidirectional fabrics, and the fiber directions of the first polyester fabric and the second polyester fabric are at 90°.

5. The high-strength and high-toughness PVC profile according to claim 1, characterized in that: The fiber fabric includes a first carbon fiber unidirectional fabric and a second carbon fiber unidirectional fabric, wherein the fiber directions of the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are at 90°.

6. The high-strength and high-toughness PVC profile according to claim 1, characterized in that: The PVC layer comprises the following components in parts by weight: 100 parts PVC resin, 15 parts light calcium carbonate, 7 parts calcium-zinc stabilizer, 2 parts plasticizer, 0.5 parts internal lubricant, 0.5 parts external lubricant, 0.2 parts stearic acid, and 10 parts zinc stannate; the plasticizer is trioctyl trimellitate, the internal lubricant is internal lubricant G60, and the external lubricant is polyethylene wax.

7. A method for preparing a high-strength and high-toughness PVC profile, for preparing the high-strength and high-toughness PVC profile according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Preparation of the first and second fiber fabrics: The PVC resin, calcium zinc stabilizer and diisononyl phthalate in the formula amount are heated and sheared to obtain PVC slurry. Then, the PVC slurry is rolled onto the fiber fabric using a coating machine. After pre-drying in an oven at 100-130℃ for 3 minutes, it is plasticized and molded at 180℃ to obtain the first and second fiber fabrics respectively. Step 2: Prepare the high-strength layer slurry required for the first and second high-strength layers: Heat and shear plasticize the formulated amounts of PVC resin, calcium-zinc stabilizer, internal lubricant, external lubricant and stearic acid to obtain a pre-slurry, then add modified waste rubber particles and continue stirring until the modified waste rubber particles are fully dispersed in the pre-slurry to obtain the high-strength layer slurry; Step 3: Preparation of PVC layer slurry: The PVC layer slurry is prepared by heating and shearing the formulated amounts of PVC resin, light calcium carbonate, calcium-zinc stabilizer, plasticizer, internal lubricant, external lubricant, stearic acid, and zinc stannate. Step 4: Prepare PVC sheet: Extrude the high-strength layer slurry into the mold through an extruder, then place the second fiber cloth, extrude the PVC layer slurry into the mold above the second fiber cloth through an extruder, then place the first fiber cloth, then extrude the first high-strength layer slurry and the second high-strength layer slurry into the mold on the first fiber cloth and the second fiber cloth through an extruder, finally press and shape, cool and demold to obtain PVC profile.

8. The method for preparing high-strength and high-toughness PVC profiles according to claim 7, characterized in that: The preparation steps of the modified waste rubber particles are as follows: the waste rubber particles are immersed in a 0.5 g / L dopamine solution for 1 hour and then taken out. The PVC resin is hot-melted and sheared into a melt and sprayed out so that the PVC resin is uniformly attached to the outer surface of the waste rubber particles to obtain the modified waste rubber particles.

9. The method for preparing high-strength and high-toughness PVC profiles according to claim 7, characterized in that: The fiber fabric includes a first polyester fabric and a second polyester fabric. First, the first polyester fabric and the second polyester fabric are respectively coated with PVC slurry by roller. Then, the first polyester fabric and the second polyester fabric are stacked and pressed together at an angle, and plasticized after pre-drying.

10. The method for preparing high-strength and high-toughness PVC profiles according to claim 7, characterized in that: The fiber fabric includes a first carbon fiber unidirectional fabric and a second carbon fiber unidirectional fabric. First, the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are respectively coated with PVC slurry by roller. Then, the first carbon fiber unidirectional fabric and the second carbon fiber unidirectional fabric are stacked and pressed together at an angle, and then plasticized and molded after pre-baking.

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