High impact-resistant polystyrene material, and preparation method therefor and use thereof

Abstract

The present invention relates to a high impact-resistant polystyrene material, and a preparation method therefor and a use thereof. The high impact-resistant polystyrene material comprises the following components in parts by weight: 70-80 parts of an EPS recycled resin, 5-10 parts of an EPE recycled resin, 10-20 parts of an elastomeric toughening agent, 2-5 parts of modified calcium carbonate, 0.5-2 parts of an acrylate interfacial compatibilizer, and 0.7-2 parts of an auxiliary agent. Compared with the prior art, the present invention can achieve the recycling of a large amount of EPS and EPE waste foam, and is environmentally friendly, and the obtained high impact-resistant polystyrene material has excellent comprehensive performance.

Description

A high-impact polystyrene material, its preparation method and application Technical Field

[0001] This invention relates to the field of resin composition technology, specifically to a high-impact polystyrene material, its preparation method, and its application. Background Technology

[0002] Polystyrene foam (EPS) is lightweight, provides insulation, shock absorption, sound insulation, and is easy to mold. It is widely used in product packaging, food packaging, building materials, and fast food tableware. Since packaging and tableware are mostly single-use products, large quantities of discarded EPS are difficult to degrade naturally and are bulky, making transportation challenging. After consumption, they are often left in the environment, causing "white pollution" and resource waste. Reports indicate that China's annual demand for polystyrene has exceeded ten million tons, while the demand for EPS has surpassed two million tons. Because of its lightweight and low strength, discarded EPS foam is more likely to migrate and decompose into microplastics in the environment, posing a significant threat to the entire ecological environment. Therefore, the recycling of EPS foam has important environmental and economic value.

[0003] Pearl cotton, also known as expanded polyethylene foam or EPE for short, is a foamed material based on high-pressure LDPE and is widely used in the packaging industry. Although EPE is easy to recycle, the current recycling rate is generally low. Many recycled EPE products often have even worse foaming effects. A large amount of EPE pearl cotton is discarded, landfilled, or incinerated, resulting in resource waste and environmental pollution.

[0004] Based on EPS as the main component, existing technologies primarily use styrene-based thermoplastic elastomers to toughen impact-resistant polystyrene. However, recycled EPS materials often have low molecular weight and high melt flow index, resulting in low toughening efficiency. Patent CN 101070413A discloses the use of elastomers, polyethylene, and styrene-based compatibilizers to toughen waste polystyrene. This method has a certain compatibilizing effect; however, the toughening effect of styrene-based thermoplastic elastomers on styrene is greater than their compatibilizing effect. The addition of a small amount of styrene-based thermoplastic elastomers has limited improvement on impact performance. In addition, this method uses a relatively large amount of polyolefin elastomers (POE), resulting in low tensile and flexural strengths in the material. Summary of the Invention

[0005] The purpose of this invention is to provide a high-impact polystyrene material, its preparation method and application, which can recycle large quantities of EPS and EPE waste foam, is environmentally friendly, and the resulting high-impact polystyrene material has excellent comprehensive performance.

[0006] The objective of this invention can be achieved through the following technical solution: a high-impact polystyrene material comprising the following components in parts by weight: 70-80 parts of recycled EPS resin, 5-10 parts of recycled EPE resin, 10-20 parts of elastomer toughening agent, 2-5 parts of modified calcium carbonate, 0.5-2 parts of acrylate interface compatibilizer, and 0.7-2 parts of additives.

[0007] Preferably, the EPS recycled resin is a hot-melt physical method recycled resin with a melt index of 10-25 g / 10 min (200℃*5 kg).

[0008] More preferably, the specific method for recycling the EPS recycled resin is to crush, remove impurities, homogenize and remove impurities again from the EPS hot melt material, and then granulate it by screw extrusion.

[0009] Preferably, the recycled EPE resin is foaming grade EPE with a melt index of 0.5-3 g / 10 min (190℃*2.16 kg).

[0010] More preferably, the EPE recycled resin is obtained by hot melting, crushing, impurity removal, homogenization and further impurity removal, and screw extrusion granulation of foaming grade LDPE.

[0011] Preferably, the modified calcium carbonate is nano-sized and modified by stearic acid coating. That is, the modified calcium carbonate is stearic acid-coated nano-sized calcium carbonate.

[0012] Preferably, the elastomer toughening agent comprises a styrene-based thermoplastic elastomer.

[0013] Preferably, the elastomer toughening agent is a composite of styrene-based thermoplastic elastomers and polyolefin-based thermoplastic elastomers. Because styrene-based elastomers provide styrene groups, they have higher compatibility with EPS substrates, while the addition of the elasticity of polyolefin elastomers can provide more soft chains to improve the material's impact resistance.

[0014] More preferably, the mass ratio of styrene-based thermoplastic elastomer to polyolefin-based thermoplastic elastomer in the composite is (2-4):1, more preferably 3:1. The composite is preferably made by combining the two in a mass ratio of styrene-based thermoplastic elastomer / polyolefin-based thermoplastic elastomer of 3:1, using a mechanical-physical mixing method. At this ratio, the addition of an appropriate proportion of composite elastomer toughening agent can more effectively improve the impact performance of EPS materials.

[0015] More preferably, the styrene-based thermoplastic elastomer includes one or more of styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers, styrene-ethylene-butene-styrene block copolymers, styrene-hexene-butene-styrene block copolymers, and styrene-ethylene-propylene-styrene block copolymers.

[0016] More preferably, the polyolefin thermoplastic elastomer includes one or both of ethylene-α-olefin random copolymer (POE) and ethylene-α-olefin block copolymer (OBC).

[0017] Preferably, the acrylate-based interface compatibilizer is a mixture of methyl acrylate-butadiene-styrene (MBS) and vinyl copolymers.

[0018] More preferably, the vinyl copolymer includes one or more of ethylene-methyl acrylate copolymer (EMA), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), and ethylene-methyl methacrylate (EMMA).

[0019] Preferably, the high-impact polystyrene material comprises the following components in parts by weight: 70-80 parts of recycled EPS resin, 5-10 parts of recycled EPE resin, 10-20 parts of elastomer toughening agent, 2-5 parts of modified calcium carbonate, 0.5-2 parts of acrylate interface compatibilizer, 0.5-1.0 parts of light stabilizer, 0.1-0.5 parts of antioxidant, and 0.1-0.5 parts of lubricant.

[0020] More preferably, the high-impact polystyrene material comprises the following components in parts by weight: 75 parts of recycled EPS resin, 10 parts of recycled EPE resin, 15 parts of elastomer toughening agent, 3 parts of modified calcium carbonate, 1 part of acrylate interface compatibilizer, 0.8 parts of light stabilizer, 0.4 parts of antioxidant, and 0.3 parts of lubricant.

[0021] More preferably, the light stabilizer is one or both of hindered amine light stabilizers and ultraviolet absorbers.

[0022] More preferably, the hindered amine light stabilizer includes piperidine derivatives, imidazolidinone derivatives, or azacycloalkane derivatives.

[0023] More preferably, the ultraviolet absorber includes salicylates, benzophenones, benzotriazoles, or substituted acrylonitrile ultraviolet absorbers.

[0024] Preferably, the hindered amine light stabilizer is a piperidine derivative, and the ultraviolet absorber is a benzotriazole.

[0025] More preferably, the light stabilizer is a mixture of piperidine derivatives and benzotriazole ultraviolet absorbers in a mass ratio of 1:2.

[0026] More preferably, the antioxidant is one or both of hindered phenolic antioxidants or phosphite antioxidants.

[0027] More preferably, the hindered phenolic antioxidant includes pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] or octadecyl propionate.

[0028] More preferably, the phosphite antioxidant includes triphenyl phosphate, tris(2,4-di-tert-butylphenyl) phosphite, or pentaerythritol di(2,4-di-tert-butylphenyl) phosphite, preferably pentaerythritol di(2,4-di-tert-butylphenyl) phosphite.

[0029] More preferably, the antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1:1.

[0030] More preferably, the lubricant comprises one or more of fatty acid salts, fatty acid amides, silane polymers, solid paraffin, liquid paraffin, calcium stearate, zinc stearate, stearamide, silicone powder, ethylene bis-stearamide, or N,N'-ethylene bis-stearamide.

[0031] More preferably, the lubricant includes one or more of silicone powder, methyl bis-stearamide, or N,N'-ethylene bis-stearamide.

[0032] A method for preparing the above-mentioned high-impact polystyrene material includes the following steps:

[0033] (1) After drying the nano-calcium carbonate, stir it in a high-speed mixer. Set the temperature to 80-120℃ and the stirring speed to 2000-3000r / min. Then add 3-5wt% stearic acid, increase the speed to 4000-5000r / min, and continue stirring for 15-25min to obtain modified calcium carbonate.

[0034] (2) Weigh out the following by weight: 70-80 parts of EPS recycled resin, 5-10 parts of EPE recycled resin, 10-20 parts of elastomer toughening agent, 2-5 parts of modified calcium carbonate, 0.5-2 parts of acrylate interface compatibilizer, and 0.7-2 parts of additives.

[0035] (3) Add each component in step (2) to a high-speed mixer according to the above weight proportions, mix thoroughly, and then place it in a screw press. Control the screw press speed to 300-500 rpm and the temperature to 180-210℃, and extrude and granulate to produce the high-impact polystyrene material.

[0036] Preferably, in step (1), nano-calcium carbonate is dried by blowing at 110-130°C for 5-7 hours.

[0037] More preferably, in step (1), the nano-calcium carbonate is dried by blowing air at 120°C for 6 hours.

[0038] Preferably, the nano-calcium carbonate particles in step (1) have a particle size of 1-100 nm.

[0039] Preferably, in step (1), 4 wt% (i.e., the mass ratio of stearic acid to nano-calcium carbonate is 4:100) of stearic acid is added, the rotation speed is increased to 4000-5000 r / min, and stirring is continued for 20 min to obtain modified calcium carbonate.

[0040] An application of the above-mentioned high-impact polystyrene material is to use the high-impact polystyrene material in the housing of office supplies or electronic appliances.

[0041] Preferably, the high-impact polystyrene material is used for printer housings, coffee machine housings, or keyboards.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. This invention provides a high-impact polystyrene material modified from recycled EPE and EPS foam and its preparation method. It can recycle a large amount of waste EPS and EPE foam, which is environmentally friendly. The resulting high-impact polystyrene material has excellent comprehensive performance, and its IZOD notched impact strength can reach more than 130 J / m.

[0044] 2. By adding modified nano-calcium carbonate, this invention achieves the effect of toughening rigid inorganic particles, significantly improving the impact resistance of the material.

[0045] 3. The compatibility between EPS and EPE recycled foam materials is not good. Using acrylate-based interfacial compatibilizers to provide butadiene and polyethylene segments improves the compatibility between the recycled EPE resin and the styrene-based elastomer toughening agent. Furthermore, the acrylate components of the acrylate-based interfacial compatibilizer improve the compatibility between the matrix resin and modified calcium carbonate, promote the dispersion of modified calcium carbonate, and achieve a better synergistic toughening effect.

[0046] 4. This invention uses a composite toughening agent of styrene-based thermoplastic elastomer and polyolefin-based thermoplastic elastomer. The composite thermoplastic elastomer molecular chain segments contain styrene groups, which have good compatibility with EPS chain segments. At the same time, it contains polyolefin soft segments, which improves the impact performance of the material. The appropriate proportion of polyolefin elastomer composite is also beneficial to the toughening of EPE recycled resin.

[0047] 5. This invention uses a combination of thermoplastic elastomer toughening agent and light stabilizer. The thermoplastic elastomer molecular chain segment does not contain unsaturated double bonds, and has excellent weather resistance and heat aging resistance. When combined with light stabilizer, it improves the material's UV resistance. Detailed Implementation

[0048] The embodiments of the present invention will be described in detail below. The following embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0049] The raw materials used in the following examples and comparative examples include:

[0050] Styrene-ethylene-butene-styrene block copolymer (SEBS) was produced using Yueyang Petrochemical's YH502; ethylene-alpha olefin random copolymer (POE) was produced using Dow Chemical's 8100; ethylene-alpha olefin block copolymer (OBC) was produced using Dow Chemical's 9100; methyl acrylate-butadiene-styrene (MBS) was produced using Zhongyuan's M732; ethylene-methyl acrylate copolymer (EMA) was produced using Arkema's 24MA005; ethylene-vinyl acetate copolymer (EVA) was produced using Formosa Plastics' 7340M; ethylene-ethyl acrylate copolymer (EEA) was produced using DuPont's 2116; polyethylene-grafted polystyrene (PE-g-PS) was produced using Jia Yirong's BP231; and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate was produced using BASF's Tinuvin 770.

[0051] Examples 1-11:

[0052] A method for preparing high-impact polystyrene material based on EPS foam and EPE foam modification, the method comprising the following steps:

[0053] According to the weight proportions of the formulation components in Examples 1-11 of Table 1, the raw materials were added to a high-speed mixer and thoroughly mixed. Then, the mixture was placed in a screw extruder, with the screw speed controlled at 300–500 rpm and the temperature at 180–210°C. In the following examples, the specific speed selected was 400 rpm, and the screw temperatures for each section were 180°C, 180°C, 185°C, 190°C, 195°C, 195°C, 195°C, 200°C, and 210°C. The mixture was then extruded and granulated to obtain modified particles.

[0054] The material composition in Table 1 is as follows:

[0055] The EPS recycled resin component is recycled by a hot melt physical method, with a melt index of 14g / 10min (200℃*5kg), and is obtained from the hot melt recycling of waste packaging foam.

[0056] The component is recycled EPE resin with a melt index of 0.8 g / 10 min (190℃*2.16 kg), which is obtained from recycled LDPE 2426H foaming grade LDPE pearl cotton.

[0057] The component elastomer toughening agent in Example 1 is styrene-ethylene-butene-styrene block copolymer (SEBS). The component elastomer toughening agents in Examples 2, 3, 7, 8, 9, 10, and 11 are compound mixtures of styrene-ethylene-butene-styrene block copolymer (SEBS) and ethylene-alpha olefin random copolymer (POE) in a mass ratio of 3:1. The component elastomer toughening agent in Example 4 is a compound mixture of SEBS and POE in a mass ratio of 2:1. The component elastomer toughening agent in Example 5 is a compound mixture of SEBS and POE in a mass ratio of 4:1. The component elastomer toughening agent in Example 6 is a compound mixture of SEBS and ethylene-alpha olefin block copolymer (OBC) in a mass ratio of 3:1.

[0058] The modified calcium carbonate component is prepared by drying nano-calcium carbonate at 120℃ for 6 hours, then stirring it in a high-speed mixer at a temperature of 90℃ and a stirring rate of 2500 r / min. Then, 4 wt% stearic acid is added, the stirring speed is increased to 4500 r / min, and stirring is continued for 20 minutes to obtain modified nano-calcium carbonate.

[0059] The acrylate interfacial compatibilizers in Examples 1, 2, 3, 4, 5, 6, 7, 10, and 11 were mixtures of methyl acrylate-butadiene-styrene (MBS) and ethylene-methyl acrylate copolymer (EMA) in a mass ratio of 2:1. The acrylate interfacial compatibilizer in Example 8 was a mixture of MBS and ethylene-vinyl acetate copolymer (EVA) in a mass ratio of 2:1. The acrylate interfacial compatibilizer in Example 9 was a mixture of MBS and ethylene-ethyl acrylate copolymer (EEA) in a mass ratio of 2:1.

[0060] The light stabilizer is a mixture of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate and 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole in a mass ratio of 1:2.

[0061] The antioxidant component is a mixture of octadecyl propionate and tris-(2,4-di-tert-butylphenyl) phosphite in a mass ratio of 1:1.

[0062] The component lubricant is ethylene bis-stearamide.

[0063] Table 1 Masterbatch Formulation of Examples

[0064] Comparative Examples 1-6:

[0065] A method for preparing polystyrene material, the method comprising the following steps:

[0066] According to the weight parts of the formulation components in Comparative Examples 1-6 in Table 2, the raw materials were added to a high-speed mixer and thoroughly mixed. Then, the mixture was placed in a screw extruder, with the screw speed controlled at 300–500 rpm and the temperature at 180–210°C. In the following comparative examples, the specific speed selected was 400 rpm, and the screw temperatures for each section were 180°C, 180°C, 185°C, 190°C, 195°C, 195°C, 195°C, 200°C, and 210°C. The mixture was then extruded and granulated to obtain modified particles.

[0067] The material composition in Table 2 is as follows:

[0068] The EPS recycled resin component is recycled by a hot melt physical method, with a melt index of 14g / 10min (200℃*5kg), and is obtained from the hot melt recycling of waste packaging foam.

[0069] The component is recycled EPE resin with a melt index of 0.8 g / 10 min (190℃*2.16 kg), which is obtained from recycled LDPE 2426H foaming grade LDPE pearl cotton.

[0070] The component elastomer toughening agents of Comparative Examples 1, 2, 3, and 4 were compounded products of styrene-ethylene-butene-styrene block copolymer (SEBS) and ethylene-α-olefin random copolymer (POE) in a mass ratio of 3:1.

[0071] The modified calcium carbonate of Comparative Examples 2, 4, and 6 was prepared by drying nano-calcium carbonate in a forced-air dryer at 120°C for 6 hours, then stirring it in a high-speed mixer at a temperature of 90°C and a stirring rate of 2500 r / min. 4 wt% stearic acid was then added, the stirring speed was increased to 4500 r / min, and stirring was continued for 20 minutes to obtain modified nano-calcium carbonate.

[0072] The acrylate interfacial compatibilizers in Comparative Examples 1 and 4 were a mixture of methyl acrylate-butadiene-styrene (MBS) and ethylene-methyl acrylate copolymer (EMA) in a mass ratio of 2:1. The compatibilizer in Comparative Example 6 was polyethylene-grafted polystyrene (PE-g-PS).

[0073] The HIPS virgin material in Comparative Example 5 is high-impact polystyrene, commercially available, and used in appliance housings.

[0074] The light stabilizer is a mixture of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate and 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole in a mass ratio of 1:2.

[0075] The antioxidant component is a mixture of octadecyl propionate and tri-(2,4-di-tert-butylphenyl) phosphite in a mass ratio of 1:1.

[0076] The component lubricant is ethylene bis-stearamide.

[0077] Table 2 Comparative Masterbatch Formulations

[0078] Performance characterization:

[0079] The performance of the products from Examples 1-11 and Comparative Examples 1-6 was characterized, and the results are shown in Table 3:

[0080] Table 3 Performance characterization of the examples and comparative products

[0081] Results analysis:

[0082] As can be seen from Example 2 and Comparative Examples 1, 2, and 3, the impact strength of the material is poor when no interfacial compatibilizer MBS / EMA and / or modified calcium carbonate are added. While adding only modified calcium carbonate improves the impact strength somewhat, the improvement is limited. Adding only MBS / EMA results in similar performance to adding only calcium carbonate. However, when both the interfacial compatibilizer and calcium carbonate are added simultaneously, the impact performance of the material is significantly improved. This indicates that MBS / EMA not only toughens and promotes compatibility between recycled EPE and the system, but also significantly improves the compatibility and dispersibility of calcium carbonate in the system, thereby enhancing the material's performance.

[0083] As can be seen from Example 2 and Comparative Example 4, the amount of recycled EPE material should not be too large.

[0084] The system of this invention involves three substances: EPS, EPE, and stearic acid modified calcium carbonate. The interface compatibilizer needs to have good compatibility with all three. As can be seen from Example 2 and Comparative Example 6, the vinyl-butadiene group and polar acrylate compatibilizer of this invention can not only achieve good compatibility, but also achieve a certain toughening effect. Its effect is better than that of the commonly used PS / PE system compatibilizer PE-g-PS.

[0085] As shown in Table 4, Example 2 represents a solution with superior overall performance and cost-effectiveness, while Comparative Example 5 is a commercially available conventional HIPS. It is evident that the high-impact polystyrene material modified with recycled EPS and EPE materials exhibits better material properties and superior UV resistance compared to ordinary HIPS, demonstrating promising application prospects. Furthermore, Example 2 contains over 80% recycled materials, offering significant environmental benefits in addressing white foam pollution, while simultaneously turning waste into valuable resources, resulting in excellent economic efficiency.

[0086] Table 4. Test results of Example 2 and Comparative Example 5

[0087] Tables 3 and 4 show the performance test results, with specific items as follows:

[0088] Izod impact strength: tested according to ASTM-D256 standard;

[0089] MI: Tested according to ASTM-D1238 standard;

[0090] Tensile strength: tested according to ASTM-D638 standard;

[0091] Bending strength: tested according to ASTM-D790 standard;

[0092] UV aging: Tested according to ASTM-D4329 standard;

[0093] Color difference △E: Tested according to ASTM-D2244 standard.

[0094] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A high-impact polystyrene material, characterized in that, It includes the following components in parts by weight: 70-80 parts of recycled EPS resin, 5-10 parts of recycled EPE resin, 10-20 parts of elastomer toughening agent, 2-5 parts of modified calcium carbonate, 0.5-2 parts of acrylate interface compatibilizer, and 0.7-2 parts of additives.

2. The high-impact polystyrene material according to claim 1, characterized in that, The EPS recycled resin is a hot-melt physical method recycled resin, with a melt index of 10-25 g / 10 min at 200℃ and 5 kg. The recycled EPE resin is foaming grade EPE, with a melt index of 0.5-3 g / 10 min at 190℃ and 2.16 kg.

3. The high-impact polystyrene material according to claim 1, characterized in that, The modified calcium carbonate is nanoscale and is modified by coating with stearic acid.

4. The high-impact polystyrene material according to claim 1, characterized in that, The elastomer toughening agent is a composite of styrene-based thermoplastic elastomers and polyolefin-based thermoplastic elastomers.

5. The high-impact polystyrene material according to claim 4, characterized in that, The styrene-based thermoplastic elastomers include one or more of the following: styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers, styrene-ethylene-butene-styrene block copolymers, styrene-hexene-butene-styrene block copolymers, and styrene-ethylene-propylene-styrene block copolymers. The polyolefin thermoplastic elastomers include one or more of ethylene-α olefin random copolymers and ethylene-α olefin block copolymers.

6. The high-impact polystyrene material according to claim 1, characterized in that, The acrylate-based interface compatibilizer is a mixture of methyl acrylate-butadiene-styrene and vinyl copolymers; The vinyl copolymers include one or more of the following: ethylene-methyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, and ethylene-methyl methacrylate.

7. The high-impact polystyrene material according to claim 1, characterized in that, It comprises the following components in parts by weight: 70-80 parts of recycled EPS resin, 5-10 parts of recycled EPE resin, 10-20 parts of elastomer toughening agent, 2-5 parts of modified calcium carbonate, 0.5-2 parts of acrylate interface compatibilizer, 0.5-1.0 parts of light stabilizer, 0.1-0.5 parts of antioxidant, and 0.1-0.5 parts of lubricant; The light stabilizer is one or more of hindered amine light stabilizers or ultraviolet absorbers; The antioxidant is one or more of hindered phenolic antioxidants or phosphite antioxidants; The lubricant includes one or more of the following: fatty acid salts, fatty acid amides, silane polymers, solid paraffin, liquid paraffin, calcium stearate, zinc stearate, stearamide, silicone powder, methyl bis-stearamide, or N,N'-ethylene bis-stearamide.

8. The high-impact polystyrene material according to claim 7, characterized in that, The hindered amine light stabilizers include piperidine derivatives, imidazolidinone derivatives, or azacycloalkane derivatives. The ultraviolet absorber includes salicylates, benzophenones, benzotriazoles, or substituted acrylonitrile ultraviolet absorbers; The hindered phenolic antioxidants include pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] or stearyl propionate; The phosphite antioxidants include triphenyl phosphate, tris(2,4-di-tert-butylphenyl) phosphite, or pentaerythritol di(2,4-di-tert-butylphenyl) phosphite.

9. A method for preparing the high-impact polystyrene material according to any one of claims 1-8, characterized in that, Includes the following steps: (1) After drying the nano-calcium carbonate, stir it in a high-speed mixer. Set the temperature to 80-120℃ and the stirring speed to 2000-3000r / min. Then add 3-5wt% stearic acid, increase the speed to 4000-5000r / min, and continue stirring for 15-25min to obtain modified calcium carbonate. (2) Weigh out the following by weight: 70-80 parts of EPS recycled resin, 5-10 parts of EPE recycled resin, 10-20 parts of elastomer toughening agent, 2-5 parts of modified calcium carbonate, 0.5-2 parts of acrylate interface compatibilizer, and 0.7-2 parts of additives. (3) Add each component in step (2) to a high-speed mixer according to the above weight proportions, mix thoroughly, and then place it in a screw press. Control the screw press speed to 300-500 rpm and the temperature to 180-210℃, and extrude and granulate to produce the high-impact polystyrene material.

10. An application of the high-impact polystyrene material according to any one of claims 1-8, characterized in that, The high-impact polystyrene material is used for office supplies or electronic appliance housings.

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