Polystyrene line added with plant fibers and preparation method of polystyrene line

Abstract

The invention relates to the technical field of polystyrene lines, in particular to a polystyrene line added with plant fibers and a preparation method of the polystyrene line. The polystyrene line added with the plant fibers is prepared from the following raw materials in parts by mass: 60 to 100 parts of regenerated polystyrene, 5 to 15 parts of plant fibers, 1 to 3 parts of dopamine hydrochloride, 2 to 8 parts of activated silicon dioxide, 1 to 2 parts of compatilizer, 1 to 3 parts of nano calcium carbonate, 1 to 5 parts of fumed silica, 1 to 2 parts of ultraviolet absorbent, 1 to 2 parts of lubricant, 1 to 2 parts of antistatic agent and 1 to 2 parts of antioxidant. According to the invention, the regenerated polystyrene is adopted as the raw material, and the plant fiber is matched to modify the polystyrene, so that the green and environment-friendly concept is met, the damage to the environment is reduced, and the renewable rate of the raw material is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of polystyrene lines, in particular to a polystyrene line added with plant fibers and a preparation method thereof. Background Art

[0002] As a high-performance, low-cost engineering plastic, polystyrene is widely used across various sectors of the national economy due to its high rigidity, good transparency, excellent water and chemical resistance, outstanding electrical insulation, and excellent formability. In particular, polystyrene moldings have rapidly replaced traditional wood, stone, and metal moldings over the past decade due to their highly realistic appearance, lighter weight, moisture resistance, and recyclability, significantly enhancing the product's artistic value and user experience.

[0003] However, with the continuous expansion of its application areas and increasing market demand, the inherent flaws of polystyrene have gradually become apparent. This material is inherently hard and brittle. Under external impact, its molecular chains struggle to effectively deform to absorb energy, leading to cracks that easily form and rapidly propagate, ultimately causing the material to break. While existing technologies attempt to improve its impact resistance by adding fiber fillers, this approach often results in reduced low-temperature resistance and tensile strength, making it difficult to meet the requirements of high-quality line products.

[0004] Traditional toughening and modification methods often compromise one key characteristic while improving one. Therefore, developing a modification technology that maintains the inherent advantages of polystyrene while significantly improving its impact resistance, particularly low-temperature impact resistance, has become a critical challenge in this field. This not only impacts the application expansion of polystyrene itself but also holds significant significance for improving product quality and market competitiveness across the entire wire rope industry. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a polystyrene line with added plant fibers and a preparation method thereof.

[0006] A polystyrene line with added plant fibers. The raw materials for its preparation comprise, by mass, 60-100 parts of recycled polystyrene, 5-15 parts of plant fibers, 1-3 parts of dopamine hydrochloride, 2-8 parts of activated silicon dioxide, 1-2 parts of a compatibilizer, 1-3 parts of nano-calcium carbonate, 1-5 parts of fumed silica, 1-2 parts of an ultraviolet light absorber, 1-2 parts of a lubricant, 1-2 parts of an antistatic agent, and 1-2 parts of an antioxidant.

[0007] Preferably, the plant fiber is at least one of straw fiber, bamboo fiber, rice husk fiber, and coconut fiber.

[0008] Preferably, the compatibilizer is styrene grafted maleic anhydride resin.

[0009] Preferably, the ultraviolet light absorber is at least one of light stabilizer HPT, light stabilizer 744, ultraviolet absorber RMB, ultraviolet absorber UV-531, ultraviolet absorber UV-O, and ultraviolet absorber UV-P.

[0010] Preferably, the lubricant is at least one of stearic acid, microcrystalline wax, polyethylene wax, and oxidized polyethylene wax.

[0011] Preferably, the antistatic agent is at least one of conductive carbon black, carbon nanotubes, and graphene.

[0012] Preferably, the antioxidant is antioxidant 1010 or / and antioxidant 1076.

[0013] Preferably, the activated silica is prepared by the following steps: adding nano-silica and a dispersant to an ethanol aqueous solution and ultrasonically treating the solution for 1-2 hours, adding 3-aminopropyltriethoxysilane, reflux stirring at 70-80° C. for 5-10 hours, cooling to room temperature, centrifuging, washing, and vacuum drying.

[0014] More preferably, the mass ratio of nano-silica, dispersant and 3-aminopropyltriethoxysilane is 1-5:0.4-0.8:0.1-1.

[0015] The method for preparing the polystyrene line with added plant fibers comprises the following steps: S1. Soaking the plant fiber in anhydrous ethanol and ultrasonically treating it for 5-10 hours, filtering, washing, and vacuum drying; adding it to an aqueous solution of dopamine hydrochloride, adjusting the pH value of the system to 7-8.5, stirring for 5-10 hours, introducing oxygen during the stirring process, filtering, washing, and vacuum drying to obtain a pretreated plant fiber; S2. Evenly mix the pretreated plant fiber with recycled polystyrene, activated silica, and a compatibilizer, add nano-calcium carbonate, fumed silica, an antioxidant, an ultraviolet light absorber, a lubricant, and an antistatic agent, mix evenly, extrude at 160-180° C., shape, and cut.

[0016] Preferably, the flow rate of the introduced oxygen is 10-50 sccm. Beneficial effects

[0017] The present invention effectively solves the problems of high brittleness and poor low-temperature performance of polystyrene materials. 3-aminopropyltriethoxysilane is used to perform surface amino modification on nano-silica to form active reaction sites on its surface. The polydopamine coating formed by self-polymerization of plant fibers through oxidation with dopamine hydrochloride can produce a strong interfacial interaction with the amino-silica, forming an inorganic-organic composite interface in the polystyrene matrix. Under impact loads, the rigid particles can play a role in inhibiting crack propagation and dissipating energy in the interface layer, significantly improving stress transfer efficiency and overcoming the inherent brittleness of polystyrene.

[0018] The present invention utilizes plant fibers to provide primary toughening, while nano-silica acts as a rigid particle to effectively stop crack propagation. The synergistic effect of the two effectively enhances the low-temperature impact resistance of the material, effectively overcoming the low-temperature brittleness defect of conventional toughening agents. In combination with nano-calcium carbonate and fumed silica, the modulus drop near the glass transition temperature is delayed, and the nano-silica particles work together to maintain the toughness of the composite material in a low-temperature environment.

[0019] The present invention utilizes the ultraviolet absorption characteristics of the polydopamine coating to produce a synergistic effect with a hindered phenol antioxidant. The hindered phenol antioxidant inhibits the oxidation chain reaction by capturing free radicals. The generated phenoxy free radicals can be partially reduced by the quinone structure of the polydopamine, thereby slowing down the consumption rate of the antioxidant, extending the weather resistance of the material, establishing a long-term synergistic antioxidant mechanism, and delaying the yellowing of the material and the attenuation of mechanical properties.

[0020] The present invention adopts recycled polystyrene as raw material and uses plant fibers to modify the polystyrene used for lines. It not only conforms to the concept of green environmental protection, reduces damage to the environment, and realizes the renewable rate of raw materials, but also has good thermal stability when used for lines, so that the lines can maintain a good stable state when heated, and can effectively buffer energy when subjected to external force impact, avoiding instantaneous breakage of the material, greatly improving the impact resistance of polystyrene, especially excellent low-temperature impact resistance, and has excellent application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a comparison chart of the tensile strength and flexural modulus of the polystyrene materials obtained in Example 5 and Comparative Examples 1-2.

[0022] Figure 2 This is a comparison chart of the room temperature (25°C) impact strength and low temperature (-30°C) impact strength of the polystyrene materials obtained in Example 5 and Comparative Examples 1-2. DETAILED DESCRIPTION

[0023] The present invention will be further explained below with reference to specific embodiments.

[0024] The recycled polystyrene used below is recycled by the applicant (batch number 2024122854), and its density is 1.05g / cm 3 The styrene grafted maleic anhydride resin used below is from Dow Chemical, USA, with the brand name AMPLIFY TY 3351 and a density of 0.94 g / cm 3 .

[0025] Example 1 A polystyrene line with added plant fiber, the raw materials for its preparation include: 300g recycled polystyrene, 25g straw fiber, 5g dopamine hydrochloride, 10g activated silica, 5g styrene grafted maleic anhydride resin, 5g nano-calcium carbonate, 5g fumed silica, 5g ultraviolet absorber UV-O, 5g stearic acid, 5g conductive carbon black, and 5g antioxidant 1076.

[0026] Activated silica was prepared by the following steps: 5 g of nano-silica and 2 g of PVP K30 were added to 100 g of a 40% ethanol aqueous solution and ultrasonically treated for 1 h at an ultrasonic frequency of 60 kHz. 0.5 g of 3-aminopropyltriethoxysilane was added thereto, and the mixture was refluxed and stirred at 70°C for 5 h. The mixture was cooled to room temperature, centrifuged, washed, and vacuum dried.

[0027] The method for preparing the polystyrene line with added plant fibers comprises the following steps: S1. Soaking straw fiber in anhydrous ethanol and ultrasonically treating it for 5 h at an ultrasonic frequency of 50 kHz, filtering, washing, and vacuum drying; adding it to a 2.5 g / L mass fraction of dopamine hydrochloride aqueous solution, adjusting the pH value of the system to 7-8.5 with tris(hydroxymethylaminomethane) hydrochloride, stirring for 5 h, wherein 10 sccm of oxygen was introduced during the stirring process, filtering, washing, and vacuum drying to obtain pretreated straw fiber; S2. Add the pretreated straw fiber, recycled polystyrene, activated silica, and styrene-grafted maleic anhydride resin into a mixer and mix evenly. Add nano calcium carbonate, fumed silica, antioxidant 1076, ultraviolet absorber UV-O, stearic acid, and conductive carbon black and mix evenly. Add the mixture into a single-screw extruder, extrude at a temperature of 160° C., shape, and cut.

[0028] Example 2 A polystyrene line with added plant fiber, the raw materials for its preparation include: 500g recycled polystyrene, 75g bamboo fiber, 15g dopamine hydrochloride, 40g activated silica, 10g styrene grafted maleic anhydride resin, 15g nano calcium carbonate, 25g fumed silica, 10g ultraviolet absorber UV-531, 10g microcrystalline wax, 10g conductive carbon black, and 101010g antioxidant.

[0029] Activated silica was prepared by the following steps: 25 g of nano-silica and 4 g of PVP K30 were added to 300 g of a 60% ethanol aqueous solution and ultrasonically treated for 2 h at an ultrasonic frequency of 90 kHz. 5 g of 3-aminopropyltriethoxysilane was added thereto, and the mixture was refluxed and stirred at 80°C for 10 h. The mixture was cooled to room temperature, centrifuged, washed, and vacuum dried.

[0030] The method for preparing the polystyrene line with added plant fibers comprises the following steps: S1. Soaking bamboo fiber in anhydrous ethanol and ultrasonically treating it for 10 hours at an ultrasonic frequency of 70 kHz, filtering, washing, and vacuum drying; adding it to a 5 g / L mass fraction of dopamine hydrochloride aqueous solution, adjusting the pH value of the system to 7-8.5 with tris(hydroxymethylaminomethane) hydrochloride, stirring for 10 hours, wherein 50 sccm of oxygen is introduced during the stirring process, filtering, washing, and vacuum drying to obtain pretreated bamboo fiber; S2. Add the pretreated bamboo fiber, recycled polystyrene, activated silica, and styrene-grafted maleic anhydride resin into a mixer and mix evenly. Add nano calcium carbonate, fumed silica, antioxidant 1010, ultraviolet absorber UV-531, microcrystalline wax, and conductive carbon black and mix evenly. Add the mixture into a single-screw extruder, extrude at a temperature of 180° C., shape, and cut.

[0031] Example 3 A polystyrene line with added plant fiber, the raw materials for its preparation include: 350g recycled polystyrene, 60g coconut fiber, 7.5g dopamine hydrochloride, 35g activated silica, 6.5g styrene grafted maleic anhydride resin, 12.5g nano calcium carbonate, 10g fumed silica, 8.5g ultraviolet absorber RMB, 6g polyethylene wax, 9g conductive carbon black, and 10766g antioxidant.

[0032] Activated silica was prepared by the following steps: 20 g of nano-silica and 2.5 g of PVP K30 were added to 250 g of 45% ethanol aqueous solution and ultrasonically treated for 100 min at an ultrasonic frequency of 70 kHz. 3.5 g of 3-aminopropyltriethoxysilane was added thereto, and the mixture was refluxed and stirred at 73°C for 9 h. The mixture was cooled to room temperature, centrifuged, washed, and vacuum dried.

[0033] The method for preparing the polystyrene line with added plant fibers comprises the following steps: S1, the coconut fiber is soaked in anhydrous ethanol and ultrasonically treated for 7h, the ultrasonic frequency is 65kHz, filtered, washed, and vacuum dried; added to a mass fraction of 3g / L dopamine hydrochloride aqueous solution, tris (hydroxymethyl)aminomethane hydrochloride is used to adjust the pH value of the system to 7-8.5, stirred for 9h, wherein 20sccm of oxygen is introduced during the stirring process, filtered, washed, and vacuum dried to obtain pre-treated coconut fiber; S2. Add the pretreated coconut fiber, recycled polystyrene, activated silica, and styrene-grafted maleic anhydride resin into a mixer and mix evenly. Add nano calcium carbonate, fumed silica, antioxidant 1076, ultraviolet absorber RMB, polyethylene wax, and conductive carbon black and mix evenly. Add the mixture into a single-screw extruder, extrude at a temperature of 175° C., shape, and cut.

[0034] Example 4 A polystyrene line with added plant fiber, the raw materials for its preparation include: 450g recycled polystyrene, 40g coconut fiber, 12.5g dopamine hydrochloride, 15g activated silica, 8.5g styrene grafted maleic anhydride resin, 7.5g nano-calcium carbonate, 20g fumed silica, 6.5g light stabilizer 744, 9g polyethylene wax, 6g conductive carbon black, and 10109g antioxidant.

[0035] Activated silica was prepared by the following steps: 10 g of nano-silica and 3.5 g of PVP K30 were added to 150 g of 55% ethanol aqueous solution and ultrasonically treated for 80 min at an ultrasonic frequency of 80 kHz. 1.5 g of 3-aminopropyltriethoxysilane was added thereto, and the mixture was refluxed and stirred at 77°C for 7 h. The mixture was cooled to room temperature, centrifuged, washed, and vacuum dried.

[0036] The method for preparing the polystyrene line with added plant fibers comprises the following steps: S1, the coconut fiber is soaked in anhydrous ethanol and ultrasonically treated for 9h, the ultrasonic frequency is 55kHz, filtered, washed, and vacuum dried; added to a mass fraction of 4g / L dopamine hydrochloride aqueous solution, tris (hydroxymethyl)aminomethane hydrochloride is used to adjust the pH value of the system to 7-8.5, stirred for 7h, wherein 40sccm of oxygen is introduced during the stirring process, filtered, washed, and vacuum dried to obtain pre-treated coconut fiber; S2. Add the pretreated coconut fiber, recycled polystyrene, activated silica, and styrene-grafted maleic anhydride resin into a mixer and mix evenly. Add nano calcium carbonate, fumed silica, antioxidant 1010, light stabilizer 744, polyethylene wax, and conductive carbon black and mix evenly. Add the mixture into a single-screw extruder, extrude at a temperature of 165° C., shape, and cut.

[0037] Example 5 A polystyrene line with added plant fiber, the raw materials for its preparation include: 400g recycled polystyrene, 50g coconut fiber, 10g dopamine hydrochloride, 25g activated silica, 7.5g styrene grafted maleic anhydride resin, 10g nano-calcium carbonate, 15g fumed silica, 7.5g light stabilizer HPT, 7.5g oxidized polyethylene wax, 7.5g conductive carbon black, and 7.5g antioxidant 1010.

[0038] The activated silica is prepared by the following steps: 15 g of nano-silica, 3 g of PVP K30 are added to 200 g of 50% mass fraction ethanol aqueous solution, ultrasonic treatment for 90 min, the ultrasonic frequency is 75 kHz, 2.5 g of 3-aminopropyl triethoxysilane is added, reflux stirring at 75 ℃ for 8 h, cooling to room temperature, centrifugation, washing, vacuum drying.

[0039] The above-mentioned preparation method of the polystyrene strip added with plant fibers comprises the following steps: S1, the coconut fiber is soaked in anhydrous ethanol and ultrasonic treated for 8 h, the ultrasonic frequency is 60 kHz, filtration, washing, vacuum drying; added to a 3.5 g / L mass fraction dopamine hydrochloride aqueous solution, the pH value of the system is adjusted to 7-8.5 by using tris-hydroxymethyl aminomethane hydrochloride, stirring for 8 h, wherein 30 sccm of oxygen is introduced during the stirring process, filtration, washing, vacuum drying to obtain pretreated coconut fiber; S2, the pretreated coconut fiber is mixed with regenerated polystyrene, activated silica, styrene grafted maleic anhydride resin in a mixer, nano-calcium carbonate, fumed white carbon black, antioxidant 1010, light stabilizer HPT, oxidized polyethylene wax, conductive carbon black are mixed uniformly, added to a single screw extruder, extruded at a temperature of 170 ℃, shaped, cut.

[0040] Comparative example 1 A polystyrene strip added with plant fibers is prepared from the following raw materials: 400 g of regenerated polystyrene, 50 g of coconut fiber, 10 g of dopamine hydrochloride, 25 g of nano-silica, 7.5 g of styrene grafted maleic anhydride resin, 10 g of nano-calcium carbonate, 15 g of fumed white carbon black, 7.5 g of light stabilizer HPT, 7.5 g of oxidized polyethylene wax, 7.5 g of conductive carbon black, 7.5 g of antioxidant 1010.

[0041] The above-mentioned preparation method of the polystyrene strip added with plant fibers comprises the following steps: S1, the coconut fiber is soaked in anhydrous ethanol and ultrasonic treated for 8 h, the ultrasonic frequency is 60 kHz, filtration, washing, vacuum drying; added to a 3.5 g / L mass fraction dopamine hydrochloride aqueous solution, the pH value of the system is adjusted to 7-8.5 by using tris-hydroxymethyl aminomethane hydrochloride, stirring for 8 h, wherein 30 sccm of oxygen is introduced during the stirring process, filtration, washing, vacuum drying to obtain pretreated coconut fiber; S2, the pretreated coconut fiber is mixed with regenerated polystyrene, nano-silica, styrene grafted maleic anhydride resin in a mixer, nano-calcium carbonate, fumed white carbon black, antioxidant 1010, light stabilizer HPT, oxidized polyethylene wax, conductive carbon black are mixed uniformly, added to a single screw extruder, extruded at a temperature of 170 ℃, shaped, cut.

[0042] Comparative Example 2 A polystyrene line with added plant fibers is prepared from the following raw materials: 400 g of recycled polystyrene, 50 g of coconut fiber, 25 g of activated silica, 7.5 g of styrene-grafted maleic anhydride resin, 10 g of nano-calcium carbonate, 15 g of fumed silica, 7.5 g of light stabilizer HPT, 7.5 g of oxidized polyethylene wax, 7.5 g of conductive carbon black, and 7.5 g of antioxidant 1010.

[0043] Activated silica was prepared by the following steps: 15 g of nano-silica and 3 g of PVP K30 were added to 200 g of a 50% by mass ethanol aqueous solution and ultrasonically treated for 90 min at an ultrasonic frequency of 75 kHz. 2.5 g of 3-aminopropyltriethoxysilane was added thereto, and the mixture was refluxed and stirred at 75°C for 8 h. The mixture was cooled to room temperature, centrifuged, washed, and vacuum dried.

[0044] The method for preparing the polystyrene line with added plant fibers comprises the following steps: Coconut fiber, recycled polystyrene, activated silica, and styrene-grafted maleic anhydride resin are added to a mixer and mixed evenly. Nano calcium carbonate, fumed silica, antioxidant 1010, light stabilizer HPT, oxidized polyethylene wax, and conductive carbon black are added and mixed evenly. The mixture is added to a single-screw extruder, extruded at a temperature of 170° C., formed, and cut.

[0045] The tensile strength of the polystyrene materials obtained in Example 5 and Comparative Examples 1-2 was measured with reference to GB / T1040.2-2022 "Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics." The flexural modulus of the polystyrene materials obtained in Example 5 and Comparative Examples 1-2 was measured with reference to GB / T9341-2008 "Determination of flexural properties of plastics."

[0046] like Figure 1 As shown, the tensile strength and flexural modulus of the polystyrene material obtained in Example 5 are the highest, which are better than those in Comparative Examples 1-2 (P < 0.05).

[0047] With reference to GB / T1043.2-2018 "Determination of impact properties of simply supported beams of plastics Part 2: Instrumented impact test", the impact strength of the polystyrene materials obtained in Example 5 and Comparative Examples 1-2 was measured. The notch type was type A, the impact direction was lateral, and the temperature was 25°C and -30°C, respectively.

[0048] like Figure 2 As shown, the room temperature and low temperature impact strengths of the polystyrene material obtained in Example 5 are both the highest, which is better than that of Comparative Examples 1-2 (P < 0.05).

[0049] The reason for the above results is that the present invention effectively solves the problem of large brittleness and poor low-temperature performance of polystyrene materials. 3-aminopropyltriethoxysilane is used to modify the surface of nano-silica by amino modification, forming active reaction sites on its surface. The polydopamine coating formed by the self-polymerization of plant fibers by oxidation with dopamine hydrochloride can produce strong interfacial interactions with the amino-silica, forming an inorganic-organic composite interface in the polystyrene matrix. Under impact loads, the rigid particles can play the role of inhibiting crack propagation and dissipating energy in the interface layer, significantly improving stress transfer efficiency and overcoming the inherent brittleness of polystyrene. The present invention uses plant fibers to provide primary toughening, while nano-silica as a rigid particle effectively stops crack propagation. The synergistic effect of the two effectively enhances the low-temperature impact resistance of the material, effectively overcoming the defect of low-temperature brittleness of conventional toughening agents. In combination with nano-calcium carbonate and fumed silica, the modulus drop near the glass transition temperature is delayed, and the nano-silica particles work together to maintain the toughness of the composite material in a low-temperature environment. The present invention utilizes the ultraviolet absorption characteristics of the polydopamine coating to produce a synergistic effect with a hindered phenol antioxidant. The hindered phenol antioxidant inhibits the oxidation chain reaction by capturing free radicals. The generated phenoxy free radicals can be partially reduced by the quinone structure of the polydopamine, thereby slowing down the consumption rate of the antioxidant, extending the weather resistance of the material, establishing a long-term synergistic antioxidant mechanism, and delaying the yellowing of the material and the attenuation of mechanical properties.

[0050] 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 polystyrene line with added plant fibers, characterized in that: The raw materials for its preparation include, by mass, 60-100 parts of recycled polystyrene, 5-15 parts of plant fiber, 1-3 parts of dopamine hydrochloride, 2-8 parts of activated silicon dioxide, 1-2 parts of compatibilizer, 1-3 parts of nano calcium carbonate, 1-5 parts of fumed silica, 1-2 parts of ultraviolet light absorber, 1-2 parts of lubricant, 1-2 parts of antistatic agent and 1-2 parts of antioxidant.

2. The polystyrene line with added plant fibers according to claim 1, characterized in that: The plant fiber is at least one of straw fiber, bamboo fiber, rice husk fiber and coconut fiber.

3. The polystyrene line with added plant fibers according to claim 1, characterized in that: The compatibilizer is styrene grafted maleic anhydride resin.

4. The polystyrene line with added plant fibers according to claim 1, characterized in that: The ultraviolet light absorber is at least one of the light stabilizer HPT, light stabilizer 744, ultraviolet light absorber RMB, ultraviolet light absorber UV-531, ultraviolet light absorber UV-O, and ultraviolet light absorber UV-P.

5. The polystyrene line with added plant fibers according to claim 1, characterized in that: The lubricant is at least one of stearic acid, microcrystalline wax, polyethylene wax, and oxidized polyethylene wax; the antistatic agent is at least one of conductive carbon black, carbon nanotubes, and graphene.

6. The polystyrene line with added plant fibers according to claim 1, characterized in that: The antioxidant is antioxidant 1010 and / or antioxidant 1076.

7. The polystyrene line with added plant fibers according to claim 1, characterized in that: The activated silica is prepared by the following steps: adding nano-silica and a dispersant to an ethanol aqueous solution and ultrasonically treating for 1-2 hours, adding 3-aminopropyltriethoxysilane thereto, refluxing at 70-80° C. and stirring for 5-10 hours, cooling to room temperature, centrifuging, washing, and vacuum drying.

8. The polystyrene line with added plant fibers according to claim 7, characterized in that: The mass ratio of nano silicon dioxide, dispersant and 3-aminopropyltriethoxysilane is 1-5:0.4-0.8:0.1-1.

9. A method for preparing polystyrene lines with added plant fibers according to any one of claims 1 to 8, characterized in that: The steps include: S1. Soaking the plant fiber in anhydrous ethanol and ultrasonically treating it for 5-10 hours, filtering, washing, and vacuum drying; adding it to an aqueous solution of dopamine hydrochloride, adjusting the pH value of the system to 7-8.5, stirring for 5-10 hours, introducing oxygen during the stirring process, filtering, washing, and vacuum drying to obtain a pretreated plant fiber; S2. Evenly mix the pretreated plant fiber with recycled polystyrene, activated silica, and a compatibilizer, add nano-calcium carbonate, fumed silica, an antioxidant, an ultraviolet light absorber, a lubricant, and an antistatic agent, mix evenly, extrude at 160-180° C., shape, and cut.

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