Preparation method of high-drop-resistance modified polystyrene disposable tableware

Abstract

The invention relates to a preparation method of high-drop-resistance modified polystyrene disposable tableware, and belongs to the technical field of disposable tableware preparation. The preparation method comprises the following steps: mixing nano silicon dioxide and montmorillonite, and adding the mixture into a high-speed mixer for mixing to prepare a composite modifier; the preparation method comprises the following steps: adding polystyrene resin, a composite modifier, a flexibilizer, an antioxidant and a lubricant into a mixer, and mixing to obtain a premix; and adding the premix into a twin-screw extruder, carrying out melt blending, extruding, water-cooling, pelletizing, drying and injection molding to obtain the high-drop-resistance modified polystyrene disposable tableware. The lubricant is prepared from food-grade linoleic acid monoglyceride, food-grade glutathione, food-grade propylene glycol, baking soda and sulfydryl-beta-cyclodextrin; the prepared disposable tableware has the advantages that the anti-falling performance is obviously improved, the heat deformation temperature is high, and the hot food containing requirement can be met; the problems of agglomeration and the like are not easy to occur in the processing process, and the comprehensive performance is excellent.

Description

Technical Field

[0001] This invention relates to the field of disposable tableware preparation technology, and in particular to a method for preparing highly impact-resistant modified polystyrene disposable tableware. Background Technology

[0002] Polystyrene, with its excellent transparency, processing fluidity, chemical stability, and low cost, is a common raw material for disposable tableware, widely used in fast food boxes, soup bowls, water cups, and other fields. However, pure polystyrene has inherent defects such as high brittleness and poor impact resistance. Disposable tableware made from it is easily damaged by collisions and drops during transportation, storage, and use, which not only affects the user experience but also causes resource waste and environmental pollution.

[0003] Chinese Patent CN106565997A discloses a biodegradable disposable tableware and its preparation method, comprising a tableware body and an inner film coated on the inner surface of the tableware body. The tableware body comprises the following raw materials in parts by weight: 30-40 parts tapioca starch, 15-20 parts rice husks, 25-30 parts walnut shells, 25-30 parts flax fiber, 10-15 parts ramie fiber, 20-30 parts polyvinyl alcohol, 10-12 parts maifanite powder, 20-25 parts edible gum, 8-12 parts melamine-formaldehyde resin powder, 10-12 parts stearic acid, 0.2-0.3 parts cactus, 0.2-0.3 parts cinnamon, 0.3-0.5 parts konjac, 0.1-0.2 parts ginger, and 0.1-0.2 parts bamboo leaves; the inner film is a UV-curable resin.

[0004] Chinese Patent CN113386408A discloses a disposable tableware material, disposable tableware, and a preparation method. The disposable tableware material is made of bamboo fiber and sugarcane bagasse to form the outer and inner layers. A film made of chitosan and gelatin is coated on the inner layer. The disposable tableware made of the disposable tableware material has a heat insulation plate that is engaged with the holding body by an auxiliary component, forming a container space. Food is placed in the container space. The heat from the food causes a change in air pressure in the container space, which adsorbs the heat insulation plate into the holding body, thereby preventing food leakage. The lid is engaged above the holding body to seal the food.

[0005] Disposable tableware produced by existing technologies has poor impact resistance and is easily broken; it also has a low heat distortion temperature and poor melt flowability, and its overall performance needs to be improved. Summary of the Invention

[0006] To address the above problems, this invention provides a method for preparing highly impact-resistant modified polystyrene disposable tableware, the steps of which are as follows, in parts by weight: S1: Mix 20-40 parts of nano-silica and 5-10 parts of montmorillonite, add them to a high-speed mixer, and mix for 15-20 minutes at a speed of 1500-2000 r / min and a temperature of 80-90℃ to obtain a composite modifier. S2: Add 60-80 parts of polystyrene resin, 5-15 parts of composite modifier, 8-20 parts of toughening agent, 0.2-0.8 parts of antioxidant, and 0.5-1.5 parts of lubricant to a mixer and mix for 10-15 minutes at a speed of 300-500 r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware.

[0007] Preferably, the polystyrene resin has a weight-average molecular weight of 200,000-300,000.

[0008] Preferably, the toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 1-3:1.

[0009] Preferably, the antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 1-2:1.

[0010] Preferably, the extrusion temperature of the twin-screw extruder in S3 is 160-190℃, and the screw speed is 180-220 r / min.

[0011] Preferably, the S4 drying temperature is 80-100℃ and the time is 2-4 hours.

[0012] Preferably, the barrel temperature of the injection molding machine in S4 is 170-190℃, and the injection pressure is 80-100MPa.

[0013] Preferably, the lubricant is prepared by: By weight, 20-30 parts of food-grade linoleic acid monoglyceride, 2-8 parts of food-grade glutathione, and 250-350 parts of food-grade propylene glycol are used as solvents. After mixing, 0.7-1.3 parts of baking soda are added as catalysts. The mixture is reacted at 50-60℃ for 3-5 hours. Then, 0.2-0.6 parts of mercapto-β-cyclodextrin are added, and the reaction is continued for 1-4 hours. After the reaction is completed, the catalyst is removed by filtration, the solvent is recovered by vacuum distillation of the filtrate, and the residue is washed twice with food-grade sunflower seed oil and dried by forced air to obtain the lubricant.

[0014] Preferably, the blowing drying temperature is 75-85℃.

[0015] Preferably, the blowing drying time is 4-8 hours.

[0016] Reaction mechanism: In the composite modifier, nano-silica and montmorillonite are mixed at high speed to form a uniformly dispersed reinforcing phase, which constructs a three-dimensional support network in the polystyrene matrix, effectively inhibiting crack initiation and propagation under external force. The toughening agent compound system (styrene-butadiene rubber and ethylene-vinyl acetate copolymer) forms good interfacial compatibility with the polystyrene matrix, and absorbs impact energy through the deformation of the elastomer phase, improving the inherent brittleness of the matrix. The novel non-toxic addition-type lubricant is prepared through a specific addition reaction—linoleic acid monoglyceride undergoes addition reactions with glutathione and mercapto-β-cyclodextrin, respectively, to form a composite structure with multiple functional groups. This structure can specifically interact with the polystyrene matrix and various modifiers, which not only reduces the frictional resistance in the system and improves the uniformity of component dispersion in the molten state, avoiding agglomeration, but also strengthens the stability of the interfacial bonding between components, thus comprehensively improving the overall performance of the material through a synergistic effect.

[0017] Technical effects: 1. Significantly improved impact resistance: Through the reinforcing effect of composite modifiers and the energy absorption effect of toughening agents, the problem of easy breakage of polystyrene tableware is effectively improved, and the structural stability during transportation, storage and use is enhanced.

[0018] 2. The heat resistance is improved. The modified material has a denser structure and stronger thermal stability, which can meet the needs of hot food serving scenarios and expand its application range. 3. The processing fluidity is greatly improved, the components in the system are evenly dispersed, there are no obvious agglomeration defects during processing, ensuring that the surface of the product is smooth and regular after molding, and improving production efficiency and product qualification rate. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving the intended purpose, the following detailed description of the specific implementation methods and effects of the present invention, in conjunction with embodiments, is provided below.

[0020] 1. Drop ball impact breakage rate: The test was conducted in accordance with GB / T1408.1-2021 "Electrical strength test method for insulating materials - Part 1: Test under power frequency", the number of broken samples was recorded, and the breakage rate was calculated (breakage rate = number of broken samples / total number of samples × 100%).

[0021] 2. Heat distortion temperature: The test shall be conducted in accordance with GB / T1634.1-2004 "Determination of heat distortion temperature of plastics under load - Part 1: General test method".

[0022] 3. Melt flow index: The test shall be conducted in accordance with GB / T3682.1-2018 "Determination of melt mass flow rate (MFR) and melt volumetric flow rate (MVR) of thermoplastics - Part 1: Standard method". Example

[0023] A method for preparing highly impact-resistant modified polystyrene disposable tableware, comprising the following steps: S1: Mix 20g of nano-silica and 5g of montmorillonite, add them to a high-speed mixer, and mix for 15 minutes at a speed of 1500r / min and a temperature of 80℃ to obtain a composite modifier; S2: Add 60g of polystyrene resin, 5g of composite modifier, 8g of toughening agent, 0.2g of antioxidant, and 0.5g of lubricant to a mixer and mix for 10 minutes at a speed of 300r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware.

[0024] The polystyrene resin has a weight-average molecular weight of 200,000.

[0025] The toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 1:1.

[0026] The antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 1:1.

[0027] The extrusion temperature of the twin-screw extruder in S3 is 160℃, and the screw speed is 180r / min.

[0028] The S4 drying temperature is 80℃ and the time is 2 hours.

[0029] The barrel temperature of the injection molding machine S4 is 170℃, and the injection pressure is 80MPa.

[0030] The method for preparing the lubricant is as follows: Using 20g of food-grade linoleic acid monoglyceride, 2g of food-grade glutathione, and 250g of food-grade propylene glycol as solvents, 0.7g of baking soda was added as a catalyst, and the mixture was reacted at 50℃ for 3 hours. Then, 0.2g of mercapto-β-cyclodextrin (CAS: 81644-55-5) was added, and the reaction was continued for another hour. After the reaction was completed, the catalyst was removed by filtration, the solvent was recovered by vacuum distillation of the filtrate, and the residue was washed twice with food-grade sunflower seed oil and dried by forced air to obtain a lubricant.

[0031] The blowing drying temperature is 75℃.

[0032] The blowing drying time is 4 hours. Example

[0033] A method for preparing highly impact-resistant modified polystyrene disposable tableware, comprising the following steps: S1: Mix 25g of nano-silica and 6g of montmorillonite, add them to a high-speed mixer, and mix for 15 minutes at a speed of 1600r / min and a temperature of 85℃ to obtain a composite modifier; S2: Add 65g of polystyrene resin, 8g of composite modifier, 12g of toughening agent, 0.4g of antioxidant, and 0.8g of lubricant to a mixer and mix for 10 minutes at a speed of 400r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware.

[0034] The polystyrene resin has a weight-average molecular weight of 200,000.

[0035] The toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 2:1.

[0036] The antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 1:1.

[0037] The extrusion temperature of the twin-screw extruder in S3 is 170℃, and the screw speed is 190r / min.

[0038] The S4 drying temperature is 85℃ and the time is 3 hours.

[0039] The barrel temperature of the injection molding machine S4 is 175°C, and the injection pressure is 85MPa.

[0040] The method for preparing the lubricant is as follows: 23g of food-grade linoleic acid monoglyceride, 4g of food-grade glutathione, and 280g of food-grade propylene glycol were used as solvents. After mixing, 0.9g of baking soda was added as a catalyst, and the mixture was reacted at 55°C for 4 hours. Then, 0.3g of mercapto-β-cyclodextrin (CAS: 81644-55-5) was added, and the reaction was continued for another 2 hours. After the reaction was completed, the catalyst was removed by filtration, the solvent was recovered by vacuum distillation of the filtrate, and the residue was washed twice with food-grade sunflower seed oil and dried by forced air to obtain a lubricant.

[0041] The blowing drying temperature is 80℃.

[0042] The blowing drying time is 5 hours. Example

[0043] A method for preparing highly impact-resistant modified polystyrene disposable tableware, comprising the following steps: S1: Mix 35g of nano-silica and 8g of montmorillonite, add them to a high-speed mixer, and mix for 20 minutes at a speed of 1900r / min and a temperature of 85℃ to obtain a composite modifier; S2: Add 75g of polystyrene resin, 13g of composite modifier, 16g of toughening agent, 0.6g of antioxidant, and 1.3g of lubricant to a mixer and mix for 15 minutes at a speed of 400r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware.

[0044] The polystyrene resin has a weight-average molecular weight of 300,000.

[0045] The toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 2:1.

[0046] The antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 2:1.

[0047] The extrusion temperature of the twin-screw extruder in S3 is 180℃, and the screw speed is 210r / min.

[0048] The S4 drying temperature is 95℃ and the time is 3 hours.

[0049] The barrel temperature of the injection molding machine S4 is 185℃, and the injection pressure is 95MPa.

[0050] The method for preparing the lubricant is as follows: 28g of food-grade linoleic acid monoglyceride, 6g of food-grade glutathione, and 330g of food-grade propylene glycol were used as solvents. After mixing, 1.1g of baking soda was added as a catalyst, and the mixture was reacted at 55℃ for 4 hours. Then, 0.5g of mercapto-β-cyclodextrin (CAS: 81644-55-5) was added, and the reaction was continued for another 3 hours. After the reaction was completed, the catalyst was removed by filtration, the solvent was recovered by vacuum distillation of the filtrate, and the residue was washed twice with food-grade sunflower seed oil and dried by forced air to obtain a lubricant.

[0051] The blowing drying temperature is 80℃.

[0052] The drying time is 7 hours. Example

[0053] A method for preparing highly impact-resistant modified polystyrene disposable tableware, comprising the following steps: S1: Mix 40g of nano-silica and 10g of montmorillonite, add them to a high-speed mixer, and mix for 20min at a speed of 2000r / min and a temperature of 90℃ to obtain a composite modifier; S2: Add 80g of polystyrene resin, 15g of composite modifier, 20g of toughening agent, 0.8g of antioxidant, and 1.5g of lubricant to a mixer and mix for 15 minutes at a speed of 500r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware.

[0054] The polystyrene resin has a weight-average molecular weight of 300,000.

[0055] The toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 3:1.

[0056] The antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 2:1.

[0057] The extrusion temperature of the twin-screw extruder in S3 is 190℃, and the screw speed is 220r / min.

[0058] The S4 drying temperature is 100℃ and the time is 4 hours.

[0059] The barrel temperature of the injection molding machine S4 is 190℃, and the injection pressure is 100MPa.

[0060] The method for preparing the lubricant is as follows: 30g of food-grade linoleic acid monoglyceride, 8g of food-grade glutathione, and 350g of food-grade propylene glycol were used as solvents. After mixing, 1.3g of baking soda was added as a catalyst, and the mixture was reacted at 60℃ for 5 hours. Then, 0.6g of mercapto-β-cyclodextrin (CAS: 81644-55-5) was added, and the reaction was continued for another 4 hours. After the reaction was completed, the catalyst was removed by filtration, the solvent was recovered by vacuum distillation of the filtrate, and the residue was washed twice with food-grade sunflower seed oil and dried by forced air to obtain a lubricant.

[0061] The blowing drying temperature is 85℃.

[0062] The blowing drying time is 8 hours.

[0063] Comparative Example 1 A method for preparing highly impact-resistant modified polystyrene disposable tableware, comprising the following steps: S1: Mix 20g of nano-silica and 5g of montmorillonite, add them to a high-speed mixer, and mix for 15 minutes at a speed of 1500r / min and a temperature of 80℃ to obtain a composite modifier; S2: Add 60g of polystyrene resin, 5g of composite modifier, 8g of toughening agent, and 0.2g of antioxidant to a mixer and mix for 10 minutes at a speed of 300r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware.

[0064] The polystyrene resin has a weight-average molecular weight of 200,000.

[0065] The toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 1:1.

[0066] The antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 1:1.

[0067] The extrusion temperature of the twin-screw extruder in S3 is 160℃, and the screw speed is 180r / min.

[0068] The S4 drying temperature is 80℃ and the time is 2 hours.

[0069] The barrel temperature of the injection molding machine S4 is 170℃, and the injection pressure is 80MPa.

[0070] Comparative Example 2 A method for preparing highly impact-resistant modified polystyrene disposable tableware, comprising the following steps: S1: Mix 20g of nano-silica and 5g of montmorillonite, add them to a high-speed mixer, and mix for 15 minutes at a speed of 1500r / min and a temperature of 80℃ to obtain a composite modifier; S2: Add 60g of polystyrene resin, 5g of composite modifier, 8g of toughening agent, 0.2g of antioxidant, and 0.5g of lubricant to a mixer and mix for 10 minutes at a speed of 300r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware.

[0071] The polystyrene resin has a weight-average molecular weight of 200,000.

[0072] The toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 1:1.

[0073] The antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 1:1.

[0074] The extrusion temperature of the twin-screw extruder in S3 is 160℃, and the screw speed is 180r / min.

[0075] The S4 drying temperature is 80℃ and the time is 2 hours.

[0076] The barrel temperature of the injection molding machine S4 is 170℃, and the injection pressure is 80MPa.

[0077] The method for preparing the lubricant is as follows: Using 20g of food-grade linoleic acid monoglyceride, 2g of food-grade glutathione, and 250g of food-grade propylene glycol as solvents, 0.7g of baking soda was added as a catalyst, and the mixture was reacted at 50℃ for 3 hours. After the reaction was completed, the catalyst was removed by filtration, the solvent was recovered by vacuum distillation of the filtrate, and the residue was washed twice with food-grade sunflower seed oil and dried by forced air to obtain a lubricant.

[0078] The blowing drying temperature is 75℃.

[0079] The blowing drying time is 4 hours.

[0080] Comparative Example 3 A method for preparing highly impact-resistant modified polystyrene disposable tableware, comprising the following steps: S1: Mix 20g of nano-silica and 5g of montmorillonite, add them to a high-speed mixer, and mix for 15 minutes at a speed of 1500r / min and a temperature of 80℃ to obtain a composite modifier; S2: Add 60g of polystyrene resin, 5g of composite modifier, 8g of toughening agent, 0.2g of antioxidant, and 0.5g of lubricant to a mixer and mix for 10 minutes at a speed of 300r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware.

[0081] The polystyrene resin has a weight-average molecular weight of 200,000.

[0082] The toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 1:1.

[0083] The antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 1:1.

[0084] The extrusion temperature of the twin-screw extruder in S3 is 160℃, and the screw speed is 180r / min.

[0085] The S4 drying temperature is 80℃ and the time is 2 hours.

[0086] The barrel temperature of the injection molding machine S4 is 170℃, and the injection pressure is 80MPa.

[0087] The method for preparing the lubricant is as follows: 20g of food-grade linoleic acid monoglyceride and 250g of food-grade propylene glycol were used as solvents. After mixing, 0.7g of baking soda was added as a catalyst, and the mixture was reacted at 50℃ for 3 hours. Then, 0.2g of mercapto-β-cyclodextrin (CAS: 81644-55-5) was added, and the reaction was continued for another hour. After the reaction was completed, the catalyst was removed by filtration, the solvent was recovered by vacuum distillation of the filtrate, and the residue was washed twice with food-grade sunflower seed oil and dried by forced air to obtain a lubricant.

[0088] The blowing drying temperature is 75℃.

[0089] The blowing drying time is 4 hours.

[0090] Table 1. Test results of drop ball impact breakage rate, heat distortion temperature, and melt flow index of disposable tableware in the specific implementation plan. Drop ball impact damage rate (%) Heat distortion temperature (°C) Melt index (g / 10min) Example 1 1.8 77 5.9 Example 2 1.6 78 6.0 Example 3 1.3 80 6.2 Example 4 1.2 81 6.3 Comparative Example 1 15.2 61 4.2 Comparative Example 2 5.6 72 5.3 Comparative Example 3 4.3 73 5.5 Based on the comprehensive testing results of three core indicators—drop impact breakage rate, heat distortion temperature, and melt flow index—the modified polystyrene disposable tableware prepared by this invention outperforms existing technologies and comparative examples in all aspects. The core innovation lies in the use of a novel non-toxic addition-type lubricant prepared through a specific addition reaction: using linoleic acid monoglyceride as a base material, it undergoes addition reactions with glutathione and mercapto-β-cyclodextrin to form a novel functional monomer structure. This novel monomer not only reduces internal friction and inhibits component aggregation through a unique reaction mechanism, but also forms a highly efficient synergistic effect with composite modifiers and toughening agents, simultaneously enhancing the tableware's impact resistance and thermal stability without sacrificing processing fluidity. This invention successfully solves the technical pain points of traditional polystyrene tableware, such as high brittleness, low heat distortion temperature, and numerous processing defects, providing a new technical path for upgrading the performance of disposable tableware.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing highly impact-resistant modified polystyrene disposable tableware, comprising the following steps, in parts by weight: S1: Mix 20-40 parts of nano-silica and 5-10 parts of montmorillonite, add them to a high-speed mixer, and mix for 15-20 minutes at a speed of 1500-2000 r / min and a temperature of 80-90℃ to obtain a composite modifier. S2: Add 60-80 parts of polystyrene resin, 5-15 parts of composite modifier, 8-20 parts of toughening agent, 0.2-0.8 parts of antioxidant, and 0.5-1.5 parts of lubricant to a mixer and mix for 10-15 minutes at a speed of 300-500 r / min to obtain a premix. S3: Add the premixed material to a twin-screw extruder, melt-blend and then extrude, cool with water, and pelletize to obtain modified polystyrene granules; S4: The modified polystyrene granules are dried in an oven and then added to an injection molding machine to obtain high-impact modified polystyrene disposable tableware through injection molding. The lubricant is prepared by reacting food-grade linoleic acid monoglyceride, food-grade glutathione, sodium bicarbonate, and mercapto-β-cyclodextrin.

2. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 1, characterized in that: The polystyrene resin has a weight-average molecular weight of 200,000-300,000.

3. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 1, characterized in that: The toughening agent is a compound system of styrene-butadiene rubber and ethylene-vinyl acetate copolymer, with a mass ratio of 1-3:

1.

4. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 1, characterized in that: The antioxidant is a compound system of antioxidant 1010 and antioxidant 168, with a mass ratio of 1-2:

1.

5. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 1, characterized in that: The extrusion temperature of the twin-screw extruder in S3 is 160-190℃, and the screw speed is 180-220r / min.

6. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 1, characterized in that: The S4 drying temperature is 80-100℃, and the time is 2-4 hours.

7. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 1, characterized in that: The barrel temperature of the injection molding machine S4 is 170-190℃, and the injection pressure is 80-100MPa.

8. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 1, characterized in that: The method for preparing the lubricant is as follows: By weight, 20-30 parts of food-grade linoleic acid monoglyceride, 2-8 parts of food-grade glutathione, and 250-350 parts of food-grade propylene glycol are used as solvents. After mixing, 0.7-1.3 parts of baking soda are added as catalysts. The mixture is reacted at 50-60℃ for 3-5 hours. Then, 0.2-0.6 parts of mercapto-β-cyclodextrin are added, and the reaction is continued for 1-4 hours. After the reaction is completed, the catalyst is removed by filtration, the solvent is recovered by vacuum distillation of the filtrate, and the residue is washed twice with food-grade sunflower seed oil and dried by forced air to obtain the lubricant.

9. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 8, characterized in that: The blowing drying temperature is 75-85℃.

10. The method for preparing a highly impact-resistant modified polystyrene disposable tableware according to claim 8, characterized in that: The drying time is 4-8 hours.