Low-density anti-aging HIPS (High Impact Polystyrene) material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of high impact polystyrene, in particular to a low-density anti-aging HIPS (High Impact Polystyrene) material as well as a preparation method and application thereof. The low-density anti-aging HIPS material is prepared from the following raw materials in parts by mass: 50 to 100 parts of high impact polystyrene, 10 to 30 parts of regenerated polyvinyl chloride, 1 to 5 parts of epoxy resin, 1 to 5 parts of nano zinc oxide, 1 to 5 parts of hindered amine light stabilizer, 5 to 10 parts of foaming agent, 1 to 5 parts of filler, 1 to 2 parts of antioxidant, 1 to 2 parts of compatilizer and 1 to 2 parts of processing aid. The foaming agent comprises an AC foaming agent, activated silicon dioxide, nano lanthanum oxide, dicumyl peroxide and polyether amine D230; the activated silicon dioxide is silicon dioxide grafted by carboxyl-terminated polyamidoamine. According to the invention, the phenomena of yellowing, embrittlement, cracking, surface gloss loss and the like are not easy to occur after long-term outdoor sunshine, heat and oxygen action, the aging resistance is excellent, and the product has good mechanical properties and high impact strength.

Description

Technical Field

[0001] The present invention relates to the technical field of high-impact polystyrene, and in particular to a low-density anti-aging HIPS material and a preparation method and application thereof. Background Art

[0002] With the rapidly growing demand for lightweight, multifunctional chemical building materials in the architectural decoration market, low-foam polymer materials are experiencing significant development opportunities. Currently, low-foam products such as PVC and EVA are widely used in building insulation, packaging, and other fields. High-impact polystyrene (HIPS) has become a key material due to its unique combination of properties. HIPS foam products combine lightweight properties with excellent mechanical strength, chemical resistance, and electrical insulation at a low cost. They are widely used in building materials, electronic housings, automotive parts, and other applications.

[0003] However, traditional HIPS materials face serious aging problems in outdoor applications: ultraviolet rays cause polymer chains to break, resulting in yellowing of the product surface and reduced gloss; high temperatures accelerate the oxidation of molecular chains, causing a significant decrease in the material's impact strength; and the cell walls become brittle due to degradation, leading to stress concentration and cracking.

[0004] Existing technologies often delay aging by adding light stabilizers or increasing the degree of crosslinking, but this often comes at the expense of impact resistance. Therefore, developing a low-density HIPS material that combines high aging resistance with high mechanical property retention has become a key direction to break through the industry's technical bottleneck. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a low-density anti-aging HIPS material and its preparation method and application.

[0006] A low-density, anti-aging HIPS material comprises, by weight, 50-100 parts of high-impact polystyrene, 10-30 parts of recycled polyvinyl chloride, 1-5 parts of epoxy resin, 1-5 parts of nano-zinc oxide, 1-5 parts of hindered amine light stabilizer, 5-10 parts of foaming agent, 1-5 parts of filler, 1-2 parts of antioxidant, 1-2 parts of compatibilizer, and 1-2 parts of processing aid; the foaming agent comprises AC foaming agent, activated silica, nano-lanthanum oxide, dicumyl peroxide, and polyetheramine D230; and the activated silica is silica grafted with carboxyl-terminated polyamide amine.

[0007] Preferably, the epoxy resin is of type E51.

[0008] Preferably, the mass ratio of AC foaming agent, activated silica, nano-lanthanum oxide, dicumyl peroxide, and polyetheramine D230 is 1-5:1-2:1-2:0.1-0.5:0.01-0.1.

[0009] Preferably, the activated silica is prepared by the following steps: stirring nano-silica, carboxyl-terminated polyamidoamine, a catalyst and water for 10-20 hours at a stirring temperature of 90-95° C., and spray drying.

[0010] More preferably, the mass ratio of nano-silica to carboxyl-terminated polyamidoamine is 10-15:1-3.

[0011] More preferably, the catalyst is p-toluenesulfonic acid.

[0012] Preferably, the filler is nano calcium carbonate and / or mica powder.

[0013] Preferably, the antioxidant is a polyhydric hindered phenol antioxidant.

[0014] Preferably, the compatibilizer is maleic anhydride grafted polystyrene.

[0015] Preferably, the processing aid is a stearamide lubricant.

[0016] The method for preparing the low-density anti-aging HIPS material comprises the following steps: S1. mixing high impact polystyrene, recycled polyvinyl chloride, epoxy resin, nano zinc oxide, hindered amine light stabilizer, foaming agent, filler, antioxidant, and processing aid to obtain a premix; S2. Extrude the premix into a molding die, maintain pressure for 1-2 minutes, and remove from the die after cooling.

[0017] Preferably, in S2, extrusion is carried out in a twin-screw extruder with a screw length-to-diameter ratio of 1:20-24, and the temperatures in each zone are as follows: zone 1 175-182°C, zone 2 185-190°C, zone 3 195-200°C, zone 4 200-210°C, zone 5 200-210°C, zone 6 210-220°C, zone 7 210-220°C, zone 8 210-220°C, zone 9 210-220°C, and die head 195-198°C.

[0018] The above-mentioned low-density anti-aging HIPS material is used as an outdoor protective material. Beneficial effects

[0019] The present invention uses HIPS as the base material and adopts recycled polyvinyl chloride in combination with HIPS, which can not only effectively delay the photooxidation reaction, but also the E51 epoxy resin forms a dense protective layer through cross-linking and curing. Further, with the combination of nano zinc oxide and hindered amine light stabilizer, not only the aging resistance is synergistically improved, the outdoor service life is long, and the mechanical properties are excellent.

[0020] The foaming agent of the present invention utilizes an AC foaming agent in combination with activated silicon dioxide and nano-lanthanum oxide, which not only has a good foaming effect in the system, but also, under the premise of ensuring low density of the product, dicumyl peroxide decomposes in an extruder to induce cross-linking of PVC chain segments to form rigid cell walls, while polyetheramine D230 acts as an auxiliary curing agent to react with E51 epoxy resin to form a flexible cross-linking network, thereby balancing the brittleness caused by the rigid segments. At the same time, AC decomposes and releases gas, and the cross-linking network is used to limit cell growth. The nano-lanthanum oxide can cooperate with the action of forming nucleation points in the melt, effectively controlling the cell size and significantly improving the tensile strength of the cell walls. In the nano-activated silicon dioxide, dendritic macromolecules grafted on its surface can be cured with the epoxy resin, thereby enhancing the interaction between the molecular chains. When subjected to an external tensile force, the molecular chains are difficult to slide, further effectively improving the interfacial bonding force of the cell walls and improving the tensile strength of the product.

[0021] After being exposed to sunlight, heat and oxygen outdoors for a long time, the present invention is not only not prone to yellowing, brittleness, cracking, and surface loss of gloss, but also has excellent aging resistance. In addition, the product has good mechanical properties and high impact strength. At the same time, the preparation method is simple and suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a density comparison chart of the HIPS materials obtained in Example 5 and Comparative Examples 1-2.

[0023] Figure 2 1 is a comparison chart of the tensile strength and impact strength of the HIPS materials obtained in Example 5 and Comparative Examples 1-2.

[0024] Figure 3 This is a comparison chart of the tensile strength retention rate and impact strength retention rate of the HIPS materials obtained in Example 5 and Comparative Examples 1-2. DETAILED DESCRIPTION

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] The high-impact polystyrene used below is from Zhenjiang Chimei, brand PH88. The recycled polyvinyl chloride used below is recycled by the applicant (batch number 20250107, with a tensile strength of 19.83 MPa). The E51 epoxy resin used below is purchased from Shandong Tanghong New Materials Co., Ltd.

[0027] Example 1 A low-density anti-aging HIPS material, whose raw materials include: 500g high-impact polystyrene, 100g recycled polyvinyl chloride, 10g E51 epoxy resin, 10g nano-zinc oxide, 10g light stabilizer 944, 50g foaming agent, 5g nano-calcium carbonate, 5g mica powder, 10g antioxidant 1010, 1g maleic anhydride grafted polystyrene, and 10g ethylene bisstearamide.

[0028] The foaming agent comprises AC foaming agent, activated silica, nano-lanthanum oxide, dicumyl peroxide, and polyetheramine D230 in a mass ratio of 1:1:1:0.1:0.01. The activated silica is prepared by adding 100 g of nano-silica, 10 g of carboxyl-terminated polyamidoamine, 1 g of p-toluenesulfonic acid, and 300 g of water to a reactor at 90°C, stirring for 10 hours at a stirring speed of 100 r / min, and spray drying.

[0029] The method for preparing the low-density anti-aging HIPS material comprises the following steps: S1. High-impact polystyrene, recycled polyvinyl chloride, E51 epoxy resin, nano zinc oxide, light stabilizer 944, foaming agent, nano calcium carbonate, mica powder, antioxidant 1010, maleic anhydride grafted polystyrene, and ethylene bisstearamide were mixed and stirred at a speed of 50 r / min for 1 min to obtain a premix; S2. The premix is ​​put into a twin-screw extruder for extrusion. The screw aspect ratio is 1:20. The temperatures of each zone of the twin-screw extruder are as follows: zone 1 175°C, zone 2 185°C, zone 3 195°C, zone 4 200°C, zone 5 200°C, zone 6 210°C, zone 7 210°C, zone 8 210°C, zone 9 210°C, and the die head is 195°C. The premix is ​​then extruded into a molding die, pressure maintained for 1 minute, and the die is taken out after cooling.

[0030] Example 2 A low-density anti-aging HIPS material, whose raw materials include: 1000g high-impact polystyrene, 300g recycled polyvinyl chloride, 50g E51 epoxy resin, 50g nano zinc oxide, 50g light stabilizer 944, 100g foaming agent, 35g nano calcium carbonate, 15g mica powder, 20g antioxidant 1010, 1.2g maleic anhydride grafted polystyrene, and 20g ethylene bisstearamide.

[0031] The foaming agent comprises AC foaming agent, activated silica, nano-lanthanum oxide, dicumyl peroxide, and polyetheramine D230 in a mass ratio of 5:2:2:0.5:0.1. The activated silica is prepared by adding 150 g of nano-silica, 30 g of carboxyl-terminated polyamidoamine, 1 g of p-toluenesulfonic acid, and 600 g of water to a reactor at 95°C, stirring for 20 hours at a stirring speed of 200 r / min, and then spray drying.

[0032] The method for preparing the low-density anti-aging HIPS material comprises the following steps: S1. High-impact polystyrene, recycled polyvinyl chloride, E51 epoxy resin, nano zinc oxide, light stabilizer 944, foaming agent, nano calcium carbonate, mica powder, antioxidant 1010, maleic anhydride grafted polystyrene, and ethylene bisstearamide were mixed and stirred at a speed of 150 r / min for 3 min to obtain a premix; S2. The premix is ​​put into a twin-screw extruder for extrusion. The screw aspect ratio is 1:24. The temperatures of each zone of the twin-screw extruder are as follows: 182°C in zone 1, 190°C in zone 2, 200°C in zone 3, 210°C in zone 4, 210°C in zone 5, 220°C in zone 6, 220°C in zone 7, 220°C in zone 8, 220°C in zone 9, and 198°C in die head. The premix is ​​then extruded into a molding die, pressure maintained for 2 minutes, and taken out after the mold has cooled.

[0033] Example 3 A low-density anti-aging HIPS material, whose raw materials include: 700g high-impact polystyrene, 250g recycled polyvinyl chloride, 20g E51 epoxy resin, 40g nano zinc oxide, 20g light stabilizer 944, 90g foaming agent, 15g nano calcium carbonate, 5g mica powder, 17g antioxidant 1010, 2g maleic anhydride grafted polystyrene, and 13g ethylene bisstearamide.

[0034] The foaming agent comprises AC foaming agent, activated silica, nano-lanthanum oxide, dicumyl peroxide, and polyetheramine D230 in a mass ratio of 4:1.2:1.8:0.2:0.07. The activated silica is prepared by adding 110 g of nano-silica, 25 g of carboxyl-terminated polyamidoamine, 1 g of p-toluenesulfonic acid, and 400 g of water to a reactor at 94°C, stirring for 12 hours at a stirring speed of 180 r / min, and then spray drying.

[0035] The method for preparing the low-density anti-aging HIPS material comprises the following steps: S1. High-impact polystyrene, recycled polyvinyl chloride, E51 epoxy resin, nano zinc oxide, light stabilizer 944, foaming agent, nano calcium carbonate, mica powder, antioxidant 1010, maleic anhydride grafted polystyrene, and ethylene bisstearamide were mixed and stirred at a speed of 80 r / min for 2.5 min to obtain a premix; S2. The premix is ​​put into a twin-screw extruder for extrusion. The screw aspect ratio is 1:21. The temperatures of each zone of the twin-screw extruder are as follows: zone 1 181°C, zone 2 187°C, zone 3 199°C, zone 4 202°C, zone 5 207°C, zone 6 212°C, zone 7 218°C, zone 8 213°C, zone 9 218°C, and the die head is 196°C. The premix is ​​then extruded into a molding die, pressure maintained for 1.5 minutes, and the die is taken out after cooling.

[0036] Example 4 A low-density anti-aging HIPS material, whose raw materials include: 900g high-impact polystyrene, 150g recycled polyvinyl chloride, 40g E51 epoxy resin, 20g nano zinc oxide, 40g light stabilizer 944, 70g foaming agent, 40g mica powder, 13g antioxidant 1010, 1.5g maleic anhydride grafted polystyrene, and 17g ethylene bisstearamide.

[0037] The foaming agent comprises AC foaming agent, activated silica, nano-lanthanum oxide, dicumyl peroxide, and polyetheramine D230 in a mass ratio of 2:1.8:1.2:0.4:0.03. The activated silica is prepared by adding 130g of nano-silica, 15g of carboxyl-terminated polyamidoamine, 1g of p-toluenesulfonic acid, and 500g of water to a reactor at 92°C, stirring for 18 hours at a stirring speed of 120 rpm, and then spray drying.

[0038] The method for preparing the low-density anti-aging HIPS material comprises the following steps: S1. High-impact polystyrene, recycled polyvinyl chloride, E51 epoxy resin, nano zinc oxide, light stabilizer 944, foaming agent, mica powder, antioxidant 1010, maleic anhydride grafted polystyrene, and ethylene bisstearamide were mixed and stirred at a speed of 120 r / min for 1.5 min to obtain a premix; S2. The premix is ​​put into a twin-screw extruder for extrusion. The screw aspect ratio is 1:23. The temperatures of each zone of the twin-screw extruder are as follows: 178°C in zone 1, 189°C in zone 2, 196°C in zone 3, 208°C in zone 4, 203°C in zone 5, 218°C in zone 6, 212°C in zone 7, 217°C in zone 8, 212°C in zone 9, and 197°C in die head. The premix is ​​then extruded into a molding die, pressure maintained for 1.5 minutes, and the die is taken out after cooling.

[0039] Example 5 A low-density anti-aging HIPS material, whose raw materials include: 800g high-impact polystyrene, 200g recycled polyvinyl chloride, 30g E51 epoxy resin, 30g nano zinc oxide, 30g light stabilizer 944, 80g foaming agent, 30g nano calcium carbonate, 15g antioxidant 1010, 1.5g maleic anhydride grafted polystyrene, and 15g ethylene bisstearamide.

[0040] The foaming agent comprises AC foaming agent, activated silica, nano-lanthanum oxide, dicumyl peroxide, and polyetheramine D230 in a mass ratio of 3:1.5:1.5:0.3:0.05. The activated silica is prepared by adding 120 g of nano-silica, 20 g of carboxyl-terminated polyamidoamine, 1 g of p-toluenesulfonic acid, and 450 g of water to a reactor at 93°C, stirring for 15 hours at a stirring speed of 150 rpm, and then spray drying.

[0041] The method for preparing the low-density anti-aging HIPS material comprises the following steps: S1. High-impact polystyrene, recycled polyvinyl chloride, E51 epoxy resin, nano zinc oxide, light stabilizer 944, foaming agent, nano calcium carbonate, antioxidant 1010, maleic anhydride grafted polystyrene, and ethylene bisstearamide were mixed and stirred at a speed of 100 r / min for 2 min to obtain a premix; S2. The premix is ​​put into a twin-screw extruder for extrusion. The screw aspect ratio is 1:22. The temperatures of each zone of the twin-screw extruder are as follows: 180°C in zone 1, 188°C in zone 2, 198°C in zone 3, 205°C in zone 4, 205°C in zone 5, 215°C in zone 6, 215°C in zone 7, 215°C in zone 8, 215°C in zone 9, and 196°C in die head. The premix is ​​then extruded into a molding die, pressure maintained for 1.5 minutes, and the die is taken out after cooling.

[0042] Comparative Example 1 A low-density anti-aging HIPS material, whose raw materials include: 800g high-impact polystyrene, 230g recycled polyvinyl chloride, 30g nano zinc oxide, 30g light stabilizer 944, 80g foaming agent, 30g nano calcium carbonate, 15g antioxidant 1010, 1.5g maleic anhydride grafted polystyrene, and 15g ethylene bisstearamide.

[0043] The foaming agent comprises AC foaming agent, activated silica, nano-lanthanum oxide, dicumyl peroxide, and polyetheramine D230 in a mass ratio of 3:1.5:1.5:0.3:0.05. The activated silica is prepared by adding 120 g of nano-silica, 20 g of carboxyl-terminated polyamidoamine, 1 g of p-toluenesulfonic acid, and 450 g of water to a reactor at 93°C, stirring for 15 hours at a stirring speed of 150 rpm, and then spray drying.

[0044] The method for preparing the low-density anti-aging HIPS material comprises the following steps: S1. High-impact polystyrene, recycled polyvinyl chloride, nano zinc oxide, light stabilizer 944, foaming agent, nano calcium carbonate, antioxidant 1010, maleic anhydride grafted polystyrene, and ethylene bisstearamide were mixed and stirred at a speed of 100 r / min for 2 min to obtain a premix; S2. The premix is ​​put into a twin-screw extruder for extrusion. The screw aspect ratio is 1:22. The temperatures of each zone of the twin-screw extruder are as follows: 180°C in zone 1, 188°C in zone 2, 198°C in zone 3, 205°C in zone 4, 205°C in zone 5, 215°C in zone 6, 215°C in zone 7, 215°C in zone 8, 215°C in zone 9, and 196°C in die head. The premix is ​​then extruded into a molding die, pressure maintained for 1.5 minutes, and the die is taken out after cooling.

[0045] Comparative Example 2 A low-density anti-aging HIPS material, whose raw materials include: 800g high-impact polystyrene, 200g recycled polyvinyl chloride, 30g E51 epoxy resin, 30g nano zinc oxide, 30g light stabilizer 944, 80g foaming agent, 30g nano calcium carbonate, 15g antioxidant 1010, 1.5g maleic anhydride grafted polystyrene, and 15g ethylene bisstearamide.

[0046] The foaming agent consists of AC foaming agent, silicon dioxide, carboxyl-terminated polyamidoamine, nano lanthanum oxide, dicumyl peroxide and polyetheramine D230 in a mass ratio of 3:1.286:0.214:1.5:0.3:0.05.

[0047] The method for preparing the low-density anti-aging HIPS material comprises the following steps: S1. High-impact polystyrene, recycled polyvinyl chloride, E51 epoxy resin, nano zinc oxide, light stabilizer 944, foaming agent, nano calcium carbonate, antioxidant 1010, maleic anhydride grafted polystyrene, and ethylene bisstearamide were mixed and stirred at a speed of 100 r / min for 2 min to obtain a premix; S2. The premix is ​​put into a twin-screw extruder for extrusion. The screw aspect ratio is 1:22. The temperatures of each zone of the twin-screw extruder are as follows: 180°C in zone 1, 188°C in zone 2, 198°C in zone 3, 205°C in zone 4, 205°C in zone 5, 215°C in zone 6, 215°C in zone 7, 215°C in zone 8, 215°C in zone 9, and 196°C in die head. The premix is ​​then extruded into a molding die, pressure maintained for 1.5 minutes, and the die is taken out after cooling.

[0048] The density of the HIPS materials obtained in Example 5 and Comparative Examples 1-2 was measured with reference to GBT 6343-2009 “Determination of apparent density of foamed plastics and rubber”.

[0049] like Figure 1 As shown, the density of the HIPS material obtained in Example 5 is the smallest, which is better than that of Comparative Examples 1-2 (P < 0.05).

[0050] The tensile strength of the HIPS materials obtained in Example 5 and Comparative Examples 1-2 was measured with reference to GB / T 1040.2-2022, "Determination of Tensile Properties of Plastics - Part 2: Test Conditions for Molded and Extruded Plastics." The Izod impact strength of the HIPS materials obtained in Example 5 and Comparative Examples 1-2 was measured with reference to ASTM D256-10.

[0051] like Figure 2 As shown, the tensile strength and impact strength of the HIPS material obtained in Example 5 are the highest, which are better than those of Comparative Examples 1-2 (P < 0.05).

[0052] After irradiating the HIPS materials obtained in Example 5 and Comparative Examples 1-2 for 2500 hours under UV light of the same power, the tensile strength and impact strength of the HIPS materials obtained in Example 5 and Comparative Examples 1-2 were measured again with reference to GB / T 1040.2-2022 "Plastics — Determination of Tensile Properties — Part 2: Molded and Extruded Plastics — Test Conditions" and GB / T 1043.1-2008 "Plastics — Determination of Charpy Impact Properties — Part 1: Non-Instrumented Impact Test." The tensile strength retention rate and impact strength retention rate of each group of samples were calculated.

[0053] like Figure 3 As shown, the tensile strength retention rate and impact strength retention rate of the HIPS material obtained in Example 5 are both the highest, which are better than those of Comparative Examples 1-2 (P < 0.05).

[0054] The reason for the above results is that the present invention uses HIPS as the base material and adopts recycled polyvinyl chloride in combination with HIPS, which can not only effectively delay the photooxidation reaction, but also the E51 epoxy resin forms a dense protective layer through cross-linking and curing. Furthermore, with the combination of nano zinc oxide and hindered amine light stabilizer, not only the aging resistance is synergistically improved, the outdoor service life is long, and the mechanical properties are excellent. The foaming agent of the present invention utilizes an AC foaming agent in combination with activated silicon dioxide and nano-lanthanum oxide, which not only has a good foaming effect in the system, but also, under the premise of ensuring low density of the product, dicumyl peroxide decomposes in an extruder to trigger cross-linking of PVC chain segments to form rigid cell walls, while polyetheramine D230 constructs a flexible cross-linking network through a ring-opening reaction of epoxy groups, thereby offsetting the increase in brittleness caused by cross-linking. At the same time, AC decomposes and releases gas, and the cross-linking network is utilized to limit cell growth. The nano-lanthanum oxide can cooperate with the action of forming nucleation points in the melt, effectively controlling the cell size and significantly improving the tensile strength of the cell walls. In the nano-activated silicon dioxide, dendritic macromolecules grafted on its surface can be cured with epoxy resin, thereby enhancing the interaction between molecular chains. When subjected to an external tensile force, the molecular chains are difficult to slide, further effectively improving the interfacial bonding force of the cell walls and improving the tensile strength of the product.

[0055] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A low-density anti-aging HIPS material, characterized in that: The raw materials include, by mass: 50-100 parts of high-impact polystyrene, 10-30 parts of recycled polyvinyl chloride, 1-5 parts of epoxy resin, 1-5 parts of nano zinc oxide, 1-5 parts of hindered amine light stabilizer, 5-10 parts of foaming agent, 1-5 parts of filler, 1-2 parts of antioxidant, 1-2 parts of compatibilizer, and 1-2 parts of processing aid; The foaming agent comprises: AC foaming agent, activated silicon dioxide, nano lanthanum oxide, dicumyl peroxide and polyetheramine D230; the activated silicon dioxide is silicon dioxide grafted with terminal carboxyl polyamide amine.

2. The low-density anti-aging HIPS material according to claim 1, characterized in that: The model of epoxy resin is E51.

3. The low-density anti-aging HIPS material according to claim 1, characterized in that: The mass ratio of AC foaming agent, activated silicon dioxide, nano lanthanum oxide, dicumyl peroxide and polyetheramine D230 is 1-5:1-2:1-2:0.1-0.5:0.01-0.

1.

4. The low-density anti-aging HIPS material according to claim 1, characterized in that: The activated silica is prepared by the following steps: stirring nano-silica, carboxyl-terminated polyamidoamine, a catalyst and water for 10-20 hours at a stirring temperature of 90-95° C., and spray drying.

5. The low-density anti-aging HIPS material according to claim 4, characterized in that: The mass ratio of nano-silica to the carboxyl-terminated polyamidoamine is 10-15:1-3.

6. The low-density anti-aging HIPS material according to claim 1, characterized in that: The filler is nano calcium carbonate and / or mica powder.

7. The low-density anti-aging HIPS material according to claim 1, characterized in that: The antioxidant is a polyhydric hindered phenol type antioxidant.

8. The low-density anti-aging HIPS material according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted polystyrene, and the processing aid is stearamide lubricant.

9. A method for preparing the low-density anti-aging HIPS material according to any one of claims 1 to 8, characterized in that: The steps include: S1. mixing high impact polystyrene, recycled polyvinyl chloride, epoxy resin, nano zinc oxide, hindered amine light stabilizer, foaming agent, filler, antioxidant, and processing aid to obtain a premix; S2. Extrude the premix into a molding die, maintain pressure for 1-2 minutes, and remove from the die after cooling.

10. Use of the low-density anti-aging HIPS material according to any one of claims 1 to 8 as an outdoor protective material.

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