Preparation method of high-filling powder master batch for tray

Abstract

The invention discloses a preparation method of a high-filling powder master batch for a tray, and belongs to the technical field of chemical processing, the high-filling powder master batch for the tray comprises the following raw materials in parts by weight: 80-88 parts of inorganic powder, 3-5 parts of a coupling agent, 1-3 parts of a lubricant, 1-3 parts of an antioxidant and 15-25 parts of resin, and the high-filling powder master batch for the tray is prepared from the following raw materials in parts by weight: 80-88 parts of inorganic powder, 3-5 parts of a coupling agent, 1-3 parts of a lubricant, 1-3 parts of an antioxidant and 15-25 parts of resin. The inorganic powder comprises carbonate powder and sulfate powder which are combined in proportion, the inorganic powder is filtered and sorted before being used, it is guaranteed that the median diameter of the fineness of the used inorganic powder ranges from 0.1 micrometer to 10 micrometers, then magnetic separation impurity removal, pickling passivation and magnetic separation metal chippings are conducted, and the inorganic powder is obtained. The activity of metal ions on the surface of the powder is reduced through acid pickling and passivation, catalytic oxidation of the metal ions is avoided, and the coupling agent is a macromolecular coupling agent and comprises maleic anhydride grafted polypropylene and an ethylene-acrylate copolymer. According to the preparation method of the high-filling powder master batch for the tray, multiple adjustments and cooperation are achieved, and the product quality is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of chemical processing technology, specifically relating to a method for preparing high-filling powder masterbatch for pallets. Background Technology

[0002] High-filler powder masterbatch for trays is often made by mixing inorganic powder fillers with resins such as polypropylene as carriers, followed by extrusion and pelletizing. However, the lack of lubricant during use can affect the overall performance.

[0003] Therefore, in view of this situation, there is an urgent need to design and produce a method for preparing high-filling powder masterbatch for pallets to meet practical needs. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing high-filling powder masterbatch for trays, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-filling powder masterbatch for trays, comprising: inorganic powder, coupling agent, lubricant, antioxidant, and resin, wherein the weight percentage of each raw material is: 80-88 parts of inorganic powder, 3-5 parts of coupling agent, 1-3 parts of lubricant, 1-3 parts of antioxidant, and 15-25 parts of resin.

[0006] As a preferred embodiment, the inorganic powder includes carbonate powder and sulfate powder, and is combined in a certain proportion. The inorganic powder is filtered and sorted before use to ensure that the median diameter of the inorganic powder used is 0.1-10 micrometers. Then, it is subjected to magnetic separation to remove impurities and acid washing and passivation. Magnetic separation removes metal debris, and acid washing and passivation reduce the activity of metal ions on the powder surface to prevent catalytic oxidation.

[0007] As a preferred embodiment, the coupling agent is a macromolecular coupling agent with a molecular weight greater than 50,000, and the coupling agent includes maleic anhydride-grafted polypropylene and ethylene-acrylate copolymer.

[0008] As a preferred embodiment, the lubricant includes an internal lubricant for reducing the cohesive force between resin molecular chains and improving the fluidity of the resin melt, and an external lubricant for reducing the adhesion and friction between the material and the processing equipment, wherein the mixing ratio of the internal lubricant and the external lubricant is three to one.

[0009] In a preferred embodiment, the internal lubricant includes one or more of butyl stearate, glyceryl monostearate, and polypropylene wax, and the external lubricant includes one or more of stearic acid and ethylene bis-stearamide.

[0010] In a preferred embodiment, the antioxidant comprises a primary antioxidant and a secondary antioxidant mixed in equal proportions, wherein the primary antioxidant is a hindered phenolic compound, and the secondary antioxidant comprises one or more phosphites, thioethers, etc.

[0011] As a preferred embodiment, the resin includes one or more of polypropylene, high-density polyethylene, and copolymer polypropylene.

[0012] A method for preparing a high-filler powder masterbatch for trays includes the following steps:

[0013] Step 1, Powder Drying: Add the inorganic powder to the dryer according to the ratio, and then stir at low speed;

[0014] Step 2, Powder Activation: Transfer the dried powder to a low-speed, high-efficiency mixer, add the premixed coupling agent, and maintain stirring at 90-110°C until the powder activation rate reaches 90%, thereby improving the compatibility between the powder and the resin.

[0015] Step 3, Material Blending: Transfer the resin to another low-speed, high-efficiency mixer, heat it to the resin melting temperature, add the lubricant and antioxidant in sequence, and finally add the activating powder. Stir until all materials maintain a powder form to avoid complete plasticization and clumping.

[0016] Step 4, Cooling and Recovery: Transfer the material to a mixer equipped with a low-temperature cooling device, and rapidly cool it to room temperature under stirring. The heat generated during the cooling process can be used to preheat the dryer to achieve energy recovery.

[0017] Step 5, Finished Product Packaging: After cooling, the masterbatch is sent to the finished product silo. After passing the inspection, it is packaged in a moisture-proof bag to prevent moisture absorption from affecting its performance.

[0018] As a preferred embodiment, the powder is dried at 90-110℃ for 30 minutes under low-speed stirring to remove moisture from the powder and avoid affecting the subsequent material fusion. The moisture content of the powder after drying should be ≤0.08%.

[0019] As a preferred embodiment, the torque of the material fusion is stable in the range of 80-100 N·m, and the powder coating rate is ≥95%. The cooling is set to a gradient cooling process, first cooling to 60°C at a rate of 5-8°C / min, and then cooling to room temperature at a rate of 10-12°C / min. At the same time, the internal stress of the masterbatch is monitored during the cooling stage, and the cooling rate is adjusted through stress feedback to reduce residual internal stress.

[0020] Compared with the prior art, the technical effects and advantages of the present invention are as follows:

[0021] Firstly, the raw material system offers superior compatibility and cost-effectiveness. The solution controls the inorganic powder filling amount to 80-88 parts and increases the resin proportion to 15-25 parts, solving the problem of insufficient masterbatch adhesion under high filling. The coupling agent dosage is reduced to 3-5 parts, and combined with the efficient interfacial effect of the macromolecular coupling agent, it avoids the "blooming" defect caused by excessive dosage and reduces raw material costs. The lubricant includes an internal lubricant to reduce the cohesive force between resin molecular chains and improve the fluidity of the resin melt, and an external lubricant to reduce the adhesion and friction between materials and processing equipment, which can significantly improve product quality.

[0022] Secondly, meticulous processing enhances the effect. Inorganic powder undergoes magnetic separation to remove impurities and acid washing and passivation treatment, combined with quantitative control of moisture content ≤0.08%, which reduces the impact of metal impurities on the catalytic aging of resin, extends the service life of masterbatch and tray, and balances performance and economy.

[0023] Thirdly, process stability and production efficiency are significantly improved. The material blending stage optimizes the feeding sequence, melting the resin first before adding additives and powders. This, coupled with quantitative indicators of 80-100 N·m torque and ≥95% coating rate, ensures uniform material dispersion and reduces batch-to-batch fluctuations. The cooling process employs a gradient cooling technique, dynamically adjusting the rate through stress feedback to avoid residual stress within the masterbatch; heat recovery is used in the preheating dryer, improving energy utilization. These designs make the production process more controllable, ensuring stable masterbatch quality while improving production efficiency.

[0024] This tray uses a high-filling powder masterbatch preparation method, with multiple adjustments and combinations, to significantly improve product quality. Detailed Implementation

[0025] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0026] Example 1

[0027] This invention provides a high-filling powder masterbatch for trays, comprising: inorganic powder, coupling agent, lubricant, antioxidant, and resin, with the following weight percentages: 80 parts inorganic powder, 3 parts coupling agent, 1 part lubricant, 1 part antioxidant, and 15 parts resin.

[0028] Inorganic powders include carbonate powders and sulfate powders, which are combined in a certain proportion. Before use, the inorganic powders are filtered and sorted to ensure that the median diameter of the inorganic powders used is 0.1-10 micrometers. Then, they are subjected to magnetic separation to remove impurities and acid washing and passivation. Magnetic separation removes metal debris, and acid washing and passivation reduce the activity of metal ions on the powder surface to prevent catalytic oxidation.

[0029] The coupling agent is set as a macromolecular coupling agent with a molecular weight greater than 50,000. The coupling agent includes maleic anhydride-grafted polypropylene and ethylene-acrylate copolymer.

[0030] The lubricant includes an internal lubricant for reducing the cohesive force between resin molecular chains and improving the fluidity of the resin melt, and an external lubricant for reducing the adhesion and friction between materials and processing equipment. The internal lubricant and the external lubricant are mixed in a ratio of three to one. The internal lubricant includes one or more of butyl stearate, glyceryl monostearate, and polypropylene wax, and the external lubricant includes one or more of stearic acid and ethylene bis-stearamide.

[0031] Antioxidants include a primary antioxidant and a secondary antioxidant mixed in equal proportions. The primary antioxidant is a hindered phenol, and the secondary antioxidant includes one or more phosphites, thioethers, etc.

[0032] The resin includes one or more of polypropylene, high-density polyethylene, and copolymer polypropylene.

[0033] A method for preparing a high-filler powder masterbatch for trays includes the following steps:

[0034] Step 1, Powder Drying: Add the inorganic powder to the dryer according to the ratio, and then stir at low speed;

[0035] Step 2, Powder Activation: Transfer the dried powder to a low-speed, high-efficiency mixer, add the premixed coupling agent, and maintain stirring at 90-110°C until the powder activation rate reaches 90%, thereby improving the compatibility between the powder and the resin.

[0036] Step 3, Material Blending: Transfer the resin to another low-speed, high-efficiency mixer, heat it to the resin melting temperature, add the lubricant and antioxidant in sequence, and finally add the activating powder. Stir until all materials maintain a powder form to avoid complete plasticization and clumping.

[0037] Step 4, Cooling and Recovery: Transfer the material to a mixer equipped with a low-temperature cooling device, and rapidly cool it to room temperature under stirring. The heat generated during the cooling process can be used to preheat the dryer to achieve energy recovery.

[0038] Step 5, Finished Product Packaging: After cooling, the masterbatch is sent to the finished product silo. After passing the inspection, it is packaged in a moisture-proof bag to prevent moisture absorption from affecting its performance.

[0039] Dry at 90-110℃ for 30 minutes under low-speed stirring to remove moisture from the powder and avoid affecting subsequent material blending. The moisture content of the powder after drying should be ≤0.08%.

[0040] The torque of material fusion is stable in the range of 80-100 N·m, and the powder coating rate is ≥95%. The cooling process is set as a gradient cooling process, first cooling to 60℃ at a rate of 5-8℃ / min, and then cooling to room temperature at a rate of 10-12℃ / min. At the same time, the internal stress of the masterbatch is monitored during the cooling stage, and the cooling rate is adjusted through stress feedback to reduce residual internal stress.

[0041] Example 2

[0042] This invention provides a high-filling powder masterbatch for trays, comprising: inorganic powder, coupling agent, lubricant, antioxidant, and resin, with the following weight percentages: 88 parts inorganic powder, 5 parts coupling agent, 3 parts lubricant, 3 parts antioxidant, and 25 parts resin.

[0043] Inorganic powders include carbonate powders and sulfate powders, which are combined in a certain proportion. Before use, the inorganic powders are filtered and sorted to ensure that the median diameter of the inorganic powders used is 0.1-10 micrometers. Then, they are subjected to magnetic separation to remove impurities and acid washing and passivation. Magnetic separation removes metal debris, and acid washing and passivation reduce the activity of metal ions on the powder surface to prevent catalytic oxidation.

[0044] The coupling agent is set as a macromolecular coupling agent with a molecular weight greater than 50,000. The coupling agent includes maleic anhydride-grafted polypropylene and ethylene-acrylate copolymer.

[0045] The lubricant includes an internal lubricant for reducing the cohesive force between resin molecular chains and improving the fluidity of the resin melt, and an external lubricant for reducing the adhesion and friction between materials and processing equipment. The internal lubricant and the external lubricant are mixed in a ratio of three to one. The internal lubricant includes one or more of butyl stearate, glyceryl monostearate, and polypropylene wax, and the external lubricant includes one or more of stearic acid and ethylene bis-stearamide.

[0046] Antioxidants include a primary antioxidant and a secondary antioxidant mixed in equal proportions. The primary antioxidant is a hindered phenol, and the secondary antioxidant includes one or more phosphites, thioethers, etc.

[0047] The resin includes one or more of polypropylene, high-density polyethylene, and copolymer polypropylene.

[0048] A method for preparing a high-filler powder masterbatch for trays includes the following steps:

[0049] Step 1, Powder Drying: Add the inorganic powder to the dryer according to the ratio, and then stir at low speed;

[0050] Step 2, Powder Activation: Transfer the dried powder to a low-speed, high-efficiency mixer, add the premixed coupling agent, and maintain stirring at 90-110°C until the powder activation rate reaches 90%, thereby improving the compatibility between the powder and the resin.

[0051] Step 3, Material Blending: Transfer the resin to another low-speed, high-efficiency mixer, heat it to the resin melting temperature, add the lubricant and antioxidant in sequence, and finally add the activating powder. Stir until all materials maintain a powder form to avoid complete plasticization and clumping.

[0052] Step 4, Cooling and Recovery: Transfer the material to a mixer equipped with a low-temperature cooling device, and rapidly cool it to room temperature under stirring. The heat generated during the cooling process can be used to preheat the dryer to achieve energy recovery.

[0053] Step 5, Finished Product Packaging: After cooling, the masterbatch is sent to the finished product silo. After passing the inspection, it is packaged in a moisture-proof bag to prevent moisture absorption from affecting its performance.

[0054] Dry at 90-110℃ for 30 minutes under low-speed stirring to remove moisture from the powder and avoid affecting subsequent material blending. The moisture content of the powder after drying should be ≤0.08%.

[0055] The torque of material fusion is stable in the range of 80-100 N·m, and the powder coating rate is ≥95%. The cooling process is set as a gradient cooling process, first cooling to 60℃ at a rate of 5-8℃ / min, and then cooling to room temperature at a rate of 10-12℃ / min. At the same time, the internal stress of the masterbatch is monitored during the cooling stage, and the cooling rate is adjusted through stress feedback to reduce residual internal stress.

[0056] Example 3

[0057] This invention provides a high-filler powder masterbatch for trays, comprising: inorganic powder, coupling agent, lubricant, antioxidant, and resin, with the following weight percentages: 84 parts inorganic powder, 4 parts coupling agent, 2 parts lubricant, 2 parts antioxidant, and 20 parts resin.

[0058] Inorganic powders include carbonate powders and sulfate powders, which are combined in a certain proportion. Before use, the inorganic powders are filtered and sorted to ensure that the median diameter of the inorganic powders used is 0.1-10 micrometers. Then, they are subjected to magnetic separation to remove impurities and acid washing and passivation. Magnetic separation removes metal debris, and acid washing and passivation reduce the activity of metal ions on the powder surface to prevent catalytic oxidation.

[0059] The coupling agent is set as a macromolecular coupling agent with a molecular weight greater than 50,000. The coupling agent includes maleic anhydride-grafted polypropylene and ethylene-acrylate copolymer.

[0060] The lubricant includes an internal lubricant for reducing the cohesive force between resin molecular chains and improving the fluidity of the resin melt, and an external lubricant for reducing the adhesion and friction between materials and processing equipment. The internal lubricant and the external lubricant are mixed in a ratio of three to one. The internal lubricant includes one or more of butyl stearate, glyceryl monostearate, and polypropylene wax, and the external lubricant includes one or more of stearic acid and ethylene bis-stearamide.

[0061] Antioxidants include a primary antioxidant and a secondary antioxidant mixed in equal proportions. The primary antioxidant is a hindered phenol, and the secondary antioxidant includes one or more phosphites, thioethers, etc.

[0062] The resin includes one or more of polypropylene, high-density polyethylene, and copolymer polypropylene.

[0063] A method for preparing a high-filler powder masterbatch for trays includes the following steps:

[0064] Step 1, Powder Drying: Add the inorganic powder to the dryer according to the ratio, and then stir at low speed;

[0065] Step 2, Powder Activation: Transfer the dried powder to a low-speed, high-efficiency mixer, add the premixed coupling agent, and maintain stirring at 90-110°C until the powder activation rate reaches 90%, thereby improving the compatibility between the powder and the resin.

[0066] Step 3, Material Blending: Transfer the resin to another low-speed, high-efficiency mixer, heat it to the resin melting temperature, add the lubricant and antioxidant in sequence, and finally add the activating powder. Stir until all materials maintain a powder form to avoid complete plasticization and clumping.

[0067] Step 4, Cooling and Recovery: Transfer the material to a mixer equipped with a low-temperature cooling device, and rapidly cool it to room temperature under stirring. The heat generated during the cooling process can be used to preheat the dryer to achieve energy recovery.

[0068] Step 5, Finished Product Packaging: After cooling, the masterbatch is sent to the finished product silo. After passing the inspection, it is packaged in a moisture-proof bag to prevent moisture absorption from affecting its performance.

[0069] Dry at 90-110℃ for 30 minutes under low-speed stirring to remove moisture from the powder and avoid affecting subsequent material blending. The moisture content of the powder after drying should be ≤0.08%.

[0070] The torque of material fusion is stable in the range of 80-100 N·m, and the powder coating rate is ≥95%. The cooling process is set as a gradient cooling process, first cooling to 60℃ at a rate of 5-8℃ / min, and then cooling to room temperature at a rate of 10-12℃ / min. At the same time, the internal stress of the masterbatch is monitored during the cooling stage, and the cooling rate is adjusted through stress feedback to reduce residual internal stress.

[0071] Comparison Example

[0072] This invention provides a high-filler powder masterbatch for trays, comprising: inorganic powder, coupling agent, lubricant, antioxidant, and resin, with the following weight percentages: 68 parts inorganic powder, 8 parts coupling agent, 7 parts lubricant, 4 parts antioxidant, and 10 parts resin.

[0073] Inorganic powders include carbonate powders and sulfate powders, which are combined in a certain proportion. Before use, the inorganic powders are filtered and sorted to ensure that the median diameter of the inorganic powders used is 0.1-10 micrometers. Then, they are subjected to magnetic separation to remove impurities and acid washing and passivation. Magnetic separation removes metal debris, and acid washing and passivation reduce the activity of metal ions on the powder surface to prevent catalytic oxidation.

[0074] The coupling agent is set as a macromolecular coupling agent with a molecular weight greater than 50,000. The coupling agent includes maleic anhydride-grafted polypropylene and ethylene-acrylate copolymer.

[0075] The lubricant includes an internal lubricant for reducing the cohesive force between resin molecular chains and improving the fluidity of the resin melt, and an external lubricant for reducing the adhesion and friction between materials and processing equipment. The internal lubricant and the external lubricant are mixed in a ratio of three to one. The internal lubricant includes one or more of butyl stearate, glyceryl monostearate, and polypropylene wax, and the external lubricant includes one or more of stearic acid and ethylene bis-stearamide.

[0076] Antioxidants include a primary antioxidant and a secondary antioxidant mixed in equal proportions. The primary antioxidant is a hindered phenol, and the secondary antioxidant includes one or more phosphites, thioethers, etc.

[0077] The resin includes one or more of polypropylene, high-density polyethylene, and copolymer polypropylene.

[0078] A method for preparing a high-filler powder masterbatch for trays includes the following steps:

[0079] Step 1, Powder Drying: Add the inorganic powder to the dryer according to the ratio, and then stir at low speed;

[0080] Step 2, Powder Activation: Transfer the dried powder to a low-speed, high-efficiency mixer, add the premixed coupling agent, and maintain stirring at 90-110°C until the powder activation rate reaches 90%, thereby improving the compatibility between the powder and the resin.

[0081] Step 3, Material Blending: Transfer the resin to another low-speed, high-efficiency mixer, heat it to the resin melting temperature, add the lubricant and antioxidant in sequence, and finally add the activating powder. Stir until all materials maintain a powder form to avoid complete plasticization and clumping.

[0082] Step 4, Cooling and Recovery: Transfer the material to a mixer equipped with a low-temperature cooling device, and rapidly cool it to room temperature under stirring. The heat generated during the cooling process can be used to preheat the dryer to achieve energy recovery.

[0083] Step 5, Finished Product Packaging: After cooling, the masterbatch is sent to the finished product silo. After passing the inspection, it is packaged in a moisture-proof bag to prevent moisture absorption from affecting its performance.

[0084] Dry at 90-110℃ for 30 minutes under low-speed stirring to remove moisture from the powder and avoid affecting subsequent material blending. The moisture content of the powder after drying should be ≤0.08%.

[0085] The torque of material fusion is stable in the range of 80-100 N·m, and the powder coating rate is ≥95%. The cooling process is set as a gradient cooling process, first cooling to 60℃ at a rate of 5-8℃ / min, and then cooling to room temperature at a rate of 10-12℃ / min. At the same time, the internal stress of the masterbatch is monitored during the cooling stage, and the cooling rate is adjusted through stress feedback to reduce residual internal stress.

[0086] Based on the comprehensive comparison of multiple experiments, the effects of Example 1, Example 2 and Example 3 are better than those of the control example, and among Example 1, Example 2 and Example 3, Example 3 is more effective than Example 1 and Example 2.

[0087] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-filling powder masterbatch for trays, characterized in that: include: The weight percentages of the raw materials are as follows: inorganic powder 80-88 parts, coupling agent 3-5 parts, lubricant 1-3 parts, antioxidant 1-3 parts, and resin 15-25 parts.

2. The high-filling powder masterbatch for trays according to claim 1, characterized in that: The inorganic powder includes carbonate powder and sulfate powder, and is combined in a certain proportion. The inorganic powder is filtered and sorted before use to ensure that the median diameter of the inorganic powder used is 0.1-10 micrometers. Then, it is subjected to magnetic separation to remove impurities and acid washing and passivation. Magnetic separation removes metal debris, and acid washing and passivation reduce the activity of metal ions on the powder surface to prevent catalytic oxidation.

3. The high-filling powder masterbatch for trays according to claim 1, characterized in that: The coupling agent is a macromolecular coupling agent with a molecular weight greater than 50,000, and the coupling agent includes maleic anhydride-grafted polypropylene and ethylene-acrylate copolymer.

4. The high-filling powder masterbatch for trays according to claim 1, characterized in that: The lubricant includes an internal lubricant for reducing the cohesive force between resin molecular chains and improving the fluidity of the resin melt, and an external lubricant for reducing the adhesion and friction between the material and the processing equipment, wherein the mixing ratio of the internal lubricant and the external lubricant is three to one.

5. The high-filling powder masterbatch for trays according to claim 4, characterized in that: The internal lubricant includes one or more of butyl stearate, glyceryl monostearate, and polypropylene wax, and the external lubricant includes one or more of stearic acid and ethylene bis-stearamide.

6. The high-filling powder masterbatch for trays according to claim 1, characterized in that: The antioxidant comprises a primary antioxidant and a secondary antioxidant mixed in equal proportions. The primary antioxidant is a hindered phenol, and the secondary antioxidant includes one or more phosphites, thioethers, etc.

7. The high-filling powder masterbatch for trays according to claim 1, characterized in that: The resin includes one or more of polypropylene, high-density polyethylene, and copolymer polypropylene.

8. A method for preparing high-filler powder masterbatch for pallets, used to prepare the high-filler powder for pallets as described in any one of claims 1-7, characterized in that: Includes the following steps: Step 1, Powder Drying: Add the inorganic powder to the dryer according to the ratio, and then stir at low speed; Step 2, Powder Activation: Transfer the dried powder to a low-speed, high-efficiency mixer, add the premixed coupling agent, and maintain stirring at 90-110°C until the powder activation rate reaches 90%, thereby improving the compatibility between the powder and the resin. Step 3, Material Blending: Transfer the resin to another low-speed, high-efficiency mixer, heat it to the resin melting temperature, add the lubricant and antioxidant in sequence, and finally add the activating powder. Stir until all materials maintain a powder form to avoid complete plasticization and clumping. Step 4, Cooling and Recovery: Transfer the material to a mixer equipped with a low-temperature cooling device, and rapidly cool it to room temperature under stirring. The heat generated during the cooling process can be used to preheat the dryer to achieve energy recovery. Step 5, Finished Product Packaging: After cooling, the masterbatch is sent to the finished product silo. After passing the inspection, it is packaged in a moisture-proof bag to prevent moisture absorption from affecting its performance.

9. A method for preparing a high-filling powder masterbatch for trays according to claim 8, characterized in that: The powder is dried at 90-110℃ for 30 minutes under low-speed stirring to remove moisture and avoid affecting subsequent material fusion. The moisture content of the dried powder should be ≤0.08%.

10. A method for preparing a high-filling powder masterbatch for trays according to claim 8, characterized in that: The torque of the material fusion is stable in the range of 80-100 N·m, and the powder coating rate is ≥95%. The cooling is set with a gradient cooling process, first cooling to 60℃ at a rate of 5-8℃ / min, and then cooling to room temperature at a rate of 10-12℃ / min. At the same time, the internal stress of the masterbatch is monitored during the cooling stage, and the cooling rate is adjusted through stress feedback to reduce residual internal stress.