Plastic master batch for preparing frosted cup and preparation method thereof

Abstract

The application discloses a plastic master batch for preparing a frosted cup and a preparation method thereof, and belongs to the technical field of plastic master batches. The master batch comprises the following raw materials in parts by mass: 60-75 parts of homopolypropylene, 12-20 parts of a matting agent, 6-8 parts of nano silicon dioxide, 3-6 parts of a wear-resistant agent, 3-5 parts of a compatibilizer and 0.5-1 part of a lubricant. The matting agent is PMMA microspheres modified by a thiophene ring and a triazine structure, and cooperates with the nano silicon dioxide to give the cup a uniform and delicate frosted effect. The thiophene ring and the triazine structure introduced into the modified PMMA microspheres significantly improve the ultraviolet aging resistance and heat aging resistance of the material, and are fixed in the microspheres in the form of covalent bonds, thereby avoiding the migration and precipitation problems of traditional anti-aging additives and effectively preventing the cup from yellowing after long-term use. The application has important application value in the field of frosted cup preparation.

Description

Technical Field

[0001] This invention belongs to the field of plastic masterbatch technology, specifically, it relates to a plastic masterbatch for the preparation of frosted cups and a method for preparing the same. Background Technology

[0002] With the rapid development of the beverage and household goods industries, frosted plastic cups and cups, with their advantages of a smooth feel, non-slip and wear-resistant properties, soft light transmission, and high-end appearance, are gradually replacing traditional glossy plastic cups and cups, becoming the mainstream daily packaging and household container products in the market.

[0003] Currently, most frosted plastic cups on the market are made from general-purpose plastic substrates such as PP, PET, and PETG. These substrates are lightweight, resistant to low temperatures, have good formability, and are inexpensive. They are suitable for mainstream cup molding processes such as vacuum forming, blow molding, and injection molding, and can meet the needs of mass industrial production, making them the core basic material for frosted cup production. To give plastic cups a uniform and delicate frosted matte effect, the industry generally uses three methods: first, physical sandblasting or chemical etching is applied to the surface of glass or finished plastic cups to form a rough surface; second, electrical discharge machining or etching is performed on the inner wall of the injection or blow molding mold to directly obtain a frosted texture on the molded product; and third, a coating containing a matting agent is applied to the surface of a transparent or opaque substrate.

[0004] However, all of the above technologies have limitations to varying degrees. Physical sandblasting and chemical etching processes are not only cumbersome and inefficient, but also generate large amounts of dust or waste liquid, putting significant pressure on the environment. Furthermore, they can easily cause uneven cup wall thickness and localized stress concentration, leading to a decrease in yield. While mold etching eliminates secondary processing, the uniformity and durability of the sanding effect are greatly limited by the mold's precision, and each mold can only correspond to one sanding degree, resulting in high changeover costs and making it difficult to adapt to the market demands of multi-variety, small-batch production. Surface coating methods face problems such as poor adhesion between the coating and the substrate, easy peeling, and insufficient heat and wash resistance. After long-term use, the sanding effect will significantly diminish, and it may even release harmful substances, failing to meet the safety requirements for food contact materials.

[0005] In the field of plastic masterbatch technology, existing technologies include methods to achieve a matte finish on plastic products by adding inorganic matting agents. These matting agents utilize the difference in refractive index between themselves and the matrix resin, as well as the scattering of light by microscopic protrusions on their surface, to achieve a visually frosted effect. However, inorganic matting particles generally have poor compatibility with the resin matrix, resulting in uneven dispersion and a tendency to form white spots or agglomerated particles on the cup wall. This not only affects the appearance but may also become weak points in the mechanical system, reducing the impact resistance of the cup.

[0006] In addition, commercially available frosted masterbatches offer limited functionality, only achieving a basic frosted effect. However, cups and utensils are inevitably exposed to indoor light or contain hot beverages for extended periods. Under these conditions, existing masterbatches are prone to photo-oxidative or thermo-oxidative aging. Although some masterbatches contain anti-aging additives, these additives are prone to migration and precipitation during long-term use, causing yellowing of the cup surface, severely affecting the product's appearance and shortening its lifespan. Therefore, there is an urgent need to invent a plastic masterbatch suitable for frosted cups and utensils to address the pain points and shortcomings of existing technologies. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a plastic masterbatch for the preparation of frosted cups and a method for preparing the same.

[0008] The objective of this invention can be achieved through the following technical solutions:

[0009] A plastic masterbatch for preparing frosted cups comprises the following raw materials in parts by weight: 60-75 parts homopolymer polypropylene (carrier resin), 12-20 parts matting agent, 6-8 parts nano silica, 3-6 parts abrasion resistant agent, 3-5 parts compatibilizer, and 0.5-1 part lubricant.

[0010] Preferably, the matting agent is prepared by the following steps:

[0011] A1. Install a constant pressure dropping funnel, thermometer, and reflux condenser in a three-necked flask, purge with nitrogen for protection, add cyanuric chloride and anhydrous tetrahydrofuran to the flask, stir to dissolve, place in an ice-salt bath (0-5℃), then mix 2-thiophene methanol, N,N-diisopropylethylamine (DIPEA) with anhydrous tetrahydrofuran and add to the flask, keep warm and stir for 1-2 hours, remove the ice-salt bath, allow the reaction solution to rise naturally to room temperature, continue stirring for 6-7 hours, the reaction is complete, after post-processing, product A is obtained;

[0012] A2. Install a magnetic stirrer, reflux condenser and thermometer in a three-necked flask, purge with nitrogen, add anhydrous chlorobenzene and aluminum chloride to the flask, stir and disperse, then add product A and resorcinol, heat in an oil bath to 85-90℃, stir and react for 3-4 hours. After the reaction is complete, after post-processing, product B is obtained.

[0013] A3. Install a magnetic stirrer, reflux condenser and thermometer in a three-necked flask, purge with nitrogen, add product B, potassium carbonate and anhydrous N,N-dimethylformamide to the flask, stir evenly at room temperature, add 3-chloropropene, heat in an oil bath to 95-100℃, stir and react for 6-8 hours. After the reaction is complete, the improver is obtained after post-processing.

[0014] A4. Install a magnetic stirrer, reflux condenser, and thermometer in a three-necked flask, and purge with nitrogen for protection. First, add deionized water and sodium dodecylbenzenesulfonate to the flask and stir until dissolved. Then, add methyl methacrylate (MMA) and modifier in sequence. Stir evenly at room temperature. Dissolve potassium persulfate in deionized water and add it dropwise to the flask. Heat to 70-75°C and maintain the temperature for 3-4 hours. After the reaction is complete, the matting agent is obtained after post-treatment.

[0015] Preferably, the ratio of cyanuric chloride to 2-thiophene methanol in step A1 is 20.3-21.1g:22.8g.

[0016] Preferably, the ratio of product A to resorcinol in step A2 is 33.9g:11.6-12.3g.

[0017] Preferably, the ratio of product B to 3-chloropropene in step A3 is 42.3-43.7 g: 7.6 g.

[0018] Preferably, the ratio of methyl methacrylate to modifier in step A4 is 100 mL: 4.6 g.

[0019] The reaction formulas for preparing the modifier in steps A1-A3 are as follows:

[0020]

[0021] In the preparation of matting agent, the reaction formula must be followed accurately. Therefore, in step A1, the molar ratio of cyanuric chloride and 2-thiophene methanol must be strictly controlled to be close to 1:2, with the former in excess, in order to reduce side reactions.

[0022] The matting agent obtained by this invention is a modified PMMA microsphere. PMMA microsphere is a polymer microsphere. Compared with inorganic matting agents, it has good compatibility with polypropylene matrix. When it is subsequently made into cups, it can form uniform micro-protrusions on the surface of the cup, producing soft light scattering and giving it a delicate and silky frosted feel. Moreover, due to its good transparency, it does not affect the light transmittance of the cup.

[0023] By modifying the microspheres, thiophene rings and triazine UV-absorbing structures were introduced. The thiophene rings broadened the UV absorption range and increased the molar absorptivity, while the triazine structure provided high photostability and broad-spectrum absorption. In addition, both the thiophene rings and triazine rings are aromatic heterocycles with excellent heat resistance, improving the heat aging resistance of the matrix. In summary, the synergistic effect of these two components allows the modified PMMA microspheres to act as a matting agent, giving PP cups a uniform and delicate frosted appearance, while also being firmly bound to the microspheres in a covalent bond form, preventing migration and precipitation, and significantly improving the UV aging and heat aging resistance of the products.

[0024] Nano-silica, acting as an auxiliary matting agent, fills the gaps between microspheres and enhances the scratch resistance of the masterbatch. Furthermore, with the help of a compatibilizer, it reduces the aggregation of inorganic particles and promotes dispersion in the matrix. Together, these factors contribute to a uniform and durable frosted texture.

[0025] Preferably, the lubricant is zinc stearate, calcium stearate, or monoglyceride.

[0026] Preferably, the wear-resistant agent is an organosilicon-based wear-resistant agent.

[0027] This invention also provides a method for preparing plastic masterbatch for frosted cups, comprising the following steps:

[0028] S1. After drying the homopolymer polypropylene, add it together with the matting agent, nano silica, abrasion resistant agent, compatibilizer and lubricant into a high-speed mixer. Mix at low speed for 1-2 minutes, then mix at high speed for 3-5 minutes to obtain the mixture.

[0029] S2. The mixture is fed into a twin-screw extruder for melt blending. After the melt is extruded from the die head, it is granulated by underwater hot cutting to obtain plastic masterbatch for the preparation of frosted cups.

[0030] Preferably, the drying temperature is 80-85℃ and the time is 2-3 hours.

[0031] Preferably, the low-speed rotational speed is 300-500 r / min, and the high-speed rotational speed is 1200-1500 r / min.

[0032] Preferably, the water temperature for underwater hot cutting is 30-40℃.

[0033] The beneficial effects of this invention are:

[0034] 1. This invention uses PMMA microspheres and nano-silica as matting components. The two work together to give the cups a frosted texture. Furthermore, PMMA microspheres have better compatibility with the polypropylene matrix compared to inorganic matting agents.

[0035] 2. The matting agent incorporates thiophene rings and triazine UV-absorbing structures. The synergistic effect of these two components significantly enhances the material's resistance to UV aging and thermal aging, effectively preventing yellowing of cups after long-term use.

[0036] 3. The UV-resistant and heat-resistant structure is firmly bound to the PMMA microspheres in the form of covalent bonds, avoiding the migration and precipitation problems of traditional small molecule anti-aging additives during use, ensuring the durability of the frosting effect and the safety of use;

[0037] In summary, the masterbatch prepared by this invention can give cups a frosted appearance while significantly improving their resistance to ultraviolet aging and heat aging, and avoid yellowing caused by the migration and precipitation of additives. It has important application value in the field of frosted cup preparation. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] Preparation of matting agent:

[0041] A1. Install a constant pressure dropping funnel, thermometer, and reflux condenser in a three-necked flask, and purge with nitrogen. Add 24.4 g of cyanuric chloride and 100 mL of anhydrous tetrahydrofuran to the flask, stir to dissolve, and place in an ice-salt bath (0-5℃). Then, mix 29.6 g of 2-thiophene methanol, 36.9 g of N,N-diisopropylethylamine, and 100 mL of anhydrous tetrahydrofuran, and add the mixture to the flask. Keep warm and stir for 1 h. Remove the ice-salt bath and allow the reaction solution to rise naturally to room temperature. Continue stirring for 6 h until the reaction is complete. Filter, concentrate the filtrate under reduced pressure, and perform gradient elution by silica gel column chromatography (petroleum ether:ethyl acetate = 8:1 → 4:1) to obtain product A.

[0042] A2. Install a magnetic stirrer, reflux condenser, and thermometer in a three-necked flask, and purge with nitrogen. Add 150 mL of anhydrous chlorobenzene and 17.5 g of aluminum chloride to the flask, stir to disperse, then add 37.3 g of product A and 12.8 g of resorcinol. Heat in an oil bath to 85 °C and stir for 3 h. After the reaction is complete, cool the reaction solution to room temperature, filter, concentrate the filtrate under reduced pressure, and perform gradient elution by silica gel column chromatography (petroleum ether: ethyl acetate = 6:1 → 3:1) to obtain product B.

[0043] A3. Install a magnetic stirrer, reflux condenser, and thermometer in a three-necked flask, and purge with nitrogen. Add 42.3 g of product B, 8.5 g of potassium carbonate, and 150 mL of anhydrous N,N-dimethylformamide to the flask. After stirring evenly at room temperature, add 7.6 g of 3-chloropropene. Heat in an oil bath to 95 °C and stir for 6 h. Once the reaction is complete, cool the reaction solution to room temperature, filter, concentrate the filtrate under reduced pressure, and perform gradient elution using silica gel column chromatography (petroleum ether:ethyl acetate = 8:1 → 4:1) to obtain the modifier.

[0044] A4. Install a magnetic stirrer, reflux condenser, and thermometer in a three-necked flask, and purge with nitrogen. First, add deionized water and sodium dodecylbenzenesulfonate to the flask and stir to dissolve. Then, add 100 mL of methyl methacrylate (MMA) and 4.6 g of modifier in sequence. After stirring evenly at room temperature, dissolve potassium persulfate in deionized water and add it dropwise to the flask. Heat to 70°C and keep the reaction at this temperature for 3 hours. After the reaction is complete, cool to room temperature and centrifuge (8000 rpm, 10 min). Discard the supernatant. Wash the precipitate three times with deionized water and anhydrous ethanol in sequence, dry under vacuum at 50°C, and grind to obtain the matting agent.

[0045] Example 2

[0046] Preparation of matting agent:

[0047] A1. Install a constant pressure dropping funnel, thermometer, and reflux condenser in a three-necked flask, and purge with nitrogen. Add 27.4 g of cyanuric chloride and 100 mL of anhydrous tetrahydrofuran to the flask, stir to dissolve, and place in an ice-salt bath (0-5℃). Then, mix 29.6 g of 2-thiophene methanol, 36.9 g of N,N-diisopropylethylamine, and 100 mL of anhydrous tetrahydrofuran, and add the mixture to the flask. Keep warm and stir for 2 h, remove the ice-salt bath, and allow the reaction solution to rise naturally to room temperature. Continue stirring for 7 h until the reaction is complete. Filter, concentrate the filtrate under reduced pressure, and perform gradient elution by silica gel column chromatography (petroleum ether:ethyl acetate = 8:1 → 4:1) to obtain product A.

[0048] A2. Install a magnetic stirrer, reflux condenser, and thermometer in a three-necked flask, and purge with nitrogen. Add 150 mL of anhydrous chlorobenzene and 17.5 g of aluminum chloride to the flask, stir to disperse, then add 37.3 g of product A and 13.5 g of resorcinol. Heat in an oil bath to 90 °C and stir for 4 h. After the reaction is complete, cool the reaction solution to room temperature, filter, concentrate the filtrate under reduced pressure, and perform gradient elution by silica gel column chromatography (petroleum ether: ethyl acetate = 6:1 → 3:1) to obtain product B.

[0049] A3. Install a magnetic stirrer, reflux condenser, and thermometer in a three-necked flask, and purge with nitrogen. Add 43.7g of product B, 8.5g of potassium carbonate, and 150mL of anhydrous N,N-dimethylformamide to the flask. After stirring evenly at room temperature, add 7.6g of 3-chloropropene. Heat in an oil bath to 100℃ and stir for 8 hours until the reaction is complete. Cool the reaction solution to room temperature, filter, concentrate the filtrate under reduced pressure, and perform gradient elution by silica gel column chromatography (petroleum ether:ethyl acetate = 8:1 → 4:1) to obtain the modifier.

[0050] A4. Install a magnetic stirrer, reflux condenser, and thermometer in a three-necked flask, and purge with nitrogen. First, add deionized water and sodium dodecylbenzenesulfonate to the flask and stir to dissolve. Then, add 100 mL of methyl methacrylate (MMA) and 4.6 g of modifier in sequence. After stirring evenly at room temperature, dissolve potassium persulfate in deionized water and add it dropwise to the flask. Heat to 75°C and keep the reaction at this temperature for 4 hours. After the reaction is complete, cool to room temperature and centrifuge (8000 rpm, 10 min). Discard the supernatant. Wash the precipitate three times with deionized water and anhydrous ethanol in sequence, dry under vacuum at 50°C, and grind to obtain the matting agent.

[0051] Example 3

[0052] A method for preparing a plastic masterbatch for frosted cups includes the following steps:

[0053] S1. After drying 60 parts of homopolymer polypropylene at 80°C for 2 hours, add it to a high-speed mixer along with 12 parts of matting agent prepared in the same way as in Example 1, 6 parts of nano silica, 3 parts of organosilicon wear-resistant agent (model MB50-001), 3 parts of maleic anhydride grafted polypropylene, and 0.5 parts of zinc stearate. Mix at low speed (300 r / min) for 1 minute, then mix at high speed (1200 r / min) for 3 minutes to obtain a mixture.

[0054] S2. The mixture is fed into a twin-screw extruder (feeding section 160℃, melting section 180℃, mixing section 195℃, homogenization section 200℃, die head temperature 205℃, screw speed: 300r / min) for melt blending. After the melt is extruded from the die head, it is granulated by underwater hot cutting (water temperature 30℃) to obtain plastic masterbatch for the preparation of frosted cups.

[0055] Example 4

[0056] A method for preparing a plastic masterbatch for frosted cups includes the following steps:

[0057] S1. After drying 67.5 parts of homopolymer polypropylene at 85°C for 2.5 hours, it is mixed with 16 parts of matting agent prepared in the same way as in Example 2, 7 parts of nano silica, 4.5 parts of organosilicon wear-resistant agent (model MB50-001), 4 parts of maleic anhydride grafted polypropylene, and 0.75 parts of calcium stearate in a high-speed mixer. The mixture is first mixed at low speed (500 r / min) for 2 minutes, and then mixed at high speed (1500 r / min) for 5 minutes to obtain a mixture.

[0058] S2. The mixture is fed into a twin-screw extruder (feeding section 170℃, melting section 195℃, mixing section 205℃, homogenization section 210℃, die head temperature 215℃, screw speed: 400r / min) for melt blending. After the melt is extruded from the die head, it is granulated by underwater hot cutting (water temperature 40℃) to obtain plastic masterbatch for the preparation of frosted cups.

[0059] Example 5

[0060] A method for preparing a plastic masterbatch for frosted cups includes the following steps:

[0061] S1. After drying 75 parts of homopolymer polypropylene at 85°C for 3 hours, add it to a high-speed mixer along with 20 parts of matting agent prepared in the same way as in Example 2, 8 parts of nano silica, 6 parts of organosilicon wear-resistant agent (model MB50-001), 5 parts of maleic anhydride-grafted polypropylene, and 1 part of monoglyceride. Mix at low speed (500 r / min) for 2 minutes, then mix at high speed (1500 r / min) for 3-5 minutes to obtain a mixture.

[0062] S2. The mixture is fed into a twin-screw extruder (feeding section 170℃, melting section 195℃, mixing section 205℃, homogenization section 210℃, die head temperature 215℃, screw speed: 400r / min) for melt blending. After the melt is extruded from the die head, it is granulated by underwater hot cutting (water temperature 40℃) to obtain plastic masterbatch for the preparation of frosted cups.

[0063] Comparative Example 1

[0064] The only difference between this comparative example and Example 3 is that in this comparative example, an equal amount of PMMA microspheres (unmodified, produced by Beijing Zhongke Keyou Technology Co., Ltd.) were used to replace the matting agent to obtain the masterbatch.

[0065] Comparative Example 2

[0066] The only difference between this comparative example and Comparative Example 1 is that in this comparative example, 1.2 parts of UV-405 (triazine ultraviolet absorber) are added in step S1 to obtain masterbatch.

[0067] Comparative Example 3

[0068] The only difference between this comparative example and Example 3 is that no matting agent was added in this comparative example to obtain the masterbatch.

[0069] Samples from Examples 3, 4, and 5, and Comparative Examples 1, 2, and 3 were prepared according to the testing standards, and their performance was determined. The testing standards are as follows:

[0070] The haze was measured according to the GB / T 2410-2008 standard.

[0071] It adopts the GB / T 16422.3-2022 standard, uses UVA-340 lamps, and has an irradiance of 0.89 W / (m²). 2 The yellow index was measured at 60℃ for 4 hours and condensed at 50℃ for 4 hours, with a total cycle time of 168 hours. After aging, the yellow index change was measured according to GB / T 39822-2021. Under the same conditions, the yellow index change was measured after a total cycle time of 500 hours.

[0072] According to GB / T 7141-2008 standard, the yellow index change value was measured after the sample was aged in an air-circulating oven at 150℃ for 72 hours and then removed.

[0073] The performance test results are shown in Table 1:

[0074] Table 1

[0075]

[0076] As can be seen from the table above, the masterbatches prepared in Examples 3, 4 and 5 of the present invention have a frosted texture, and their anti-yellowing and heat aging resistance are significantly better than those of the comparative example. They are also less prone to precipitation and have long-term stable performance, which has important application value in the field of frosted cup preparation.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A plastic masterbatch for preparing frosted cups, characterized in that, The raw materials include the following parts by weight: 60-75 parts homopolymer polypropylene, 12-20 parts matting agent, 6-8 parts nano silica, 3-6 parts wear-resistant agent, 3-5 parts compatibilizer, and 0.5-1 part lubricant.

2. The plastic masterbatch for preparing frosted cups according to claim 1, characterized in that, The matting agent is prepared by the following steps: A1. Add cyanuric chloride and anhydrous tetrahydrofuran to a flask, stir to dissolve, place in an ice-salt bath, then mix 2-thiophene methanol, N,N-diisopropylethylamine and anhydrous tetrahydrofuran and add to the flask, keep warm and stir for 1-2 hours, stir at room temperature for 6-7 hours, the reaction is complete, and product A is obtained. A2. Add anhydrous chlorobenzene and aluminum chloride to the flask, stir and disperse, then add product A and resorcinol, stir and react at 85-90℃ for 3-4 hours until the reaction is complete, and product B is obtained. A3. Add product B, potassium carbonate and anhydrous N,N-dimethylformamide to the flask, stir evenly at room temperature, add 3-chloropropene, stir and react at 95-100℃ for 6-8 hours until the reaction is complete, and obtain the improver. A4. First, add deionized water and sodium dodecylbenzenesulfonate to the flask and stir to dissolve. Then, add methyl methacrylate and modifier in sequence and stir evenly at room temperature. Dissolve potassium persulfate in deionized water and add it dropwise to the flask. After the addition is complete, react at 70-75℃ for 3-4 hours. Once the reaction is complete, the matting agent is obtained.

3. The plastic masterbatch for preparing frosted cups according to claim 2, characterized in that, In step A1, the ratio of cyanuric chloride to 2-thiophene methanol is 20.3-21.1g:22.8g.

4. The plastic masterbatch for preparing frosted cups according to claim 2, characterized in that, In step A2, the ratio of product A to resorcinol is 33.9 g: 11.6-12.3 g.

5. A plastic masterbatch for preparing frosted cups according to claim 2, characterized in that, In step A3, the ratio of product B to 3-chloropropene is 42.3-43.7 g: 7.6 g.

6. The plastic masterbatch for preparing frosted cups according to claim 2, characterized in that, In step A4, the ratio of methyl methacrylate to modifier is 100 mL: 4.6 g.

7. The plastic masterbatch for preparing frosted cups according to claim 1, characterized in that, The lubricant is zinc stearate, calcium stearate, or monoglyceride.

8. The plastic masterbatch for preparing frosted cups according to claim 1, characterized in that, The wear-resistant agent is an organosilicon-based wear-resistant agent.

9. A method for preparing a plastic masterbatch for frosted cups, used to prepare the plastic masterbatch for frosted cups as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. After drying the homopolymer polypropylene, it is mixed with matting agent, nano silica, wear-resistant agent, compatibilizer and lubricant in a mixer to obtain a mixture. S2. The mixture is fed into an extruder for melt blending. After the melt is extruded from the die head, it is granulated to obtain plastic masterbatch for the preparation of frosted cups.

10. A method for preparing a plastic masterbatch for frosted cups according to claim 9, characterized in that, The drying temperature is 80-85℃, and the time is 2-3 hours.

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