Special modified silicon PU (polyurethane) packaging barrel and preparation method thereof

Abstract

The invention discloses a special modified silicon PU packaging barrel and a preparation method thereof, and relates to the technical field of silicon PU packaging barrels. The modified talcum powder is applied to polypropylene modification so as to solve the problems of flammability, easy static electricity and the like. Interlaminar hydroxyl is exposed through high-temperature activation of talcum powder, and piperazine pyrophosphate is fixed between layers and on the surface of the talcum powder through polymerization of phosphoric acid and piperazine, so that the flame retardant is prevented from falling off and being separated out when encountering water; an organosilicon antistatic agent is subsequently grafted, a quaternary ammonium salt group of the organosilicon antistatic agent forms a conductive channel, the quaternary ammonium salt group and phosphorus element synergistically enhance antistatic durability, and meanwhile, an organosilicon bidirectional adaptive structure reduces interfacial tension and improves compatibility. And the silicon-phosphorus element also synergistically strengthens flame retardance, so that the flame retardance of the polypropylene composite material is not attenuated, the antistatic property is lasting, the mechanical property is improved, and the use requirement of the silicon PU packaging barrel is met.

Description

Technical Field

[0001] This invention relates to the field of silicone PU packaging barrel technology, specifically to a specially modified silicone PU packaging barrel and its preparation method. Background Technology

[0002] Silicone polyurethane (SPU), as a professional elastic synthetic sports court surface material system that conforms to ergonomic principles and sports physics, is widely used in the construction of sports fields such as basketball courts and badminton courts due to its "hard on top and elastic on the bottom" structural advantage. Because SPU requires long-term storage and long-distance transportation, its packaging containers must meet the requirements of strong sealing, excellent weather resistance, and stable protective performance. Polypropylene (PP), due to its lightweight, easy processing, low cost, and good chemical stability, has become the preferred material for SPU packaging containers, meeting both the storage requirements of SPU and facilitating handling and turnover. However, pure polypropylene has significant performance shortcomings: First, it is flammable, with a limiting oxygen index of only 17%~18%, and easily melts and drips when burning. If the silicone PU packaging barrel comes into contact with an open flame, it is easy to cause a fire risk and even damage the silicone PU material. Second, it is prone to static electricity accumulation due to its high surface resistivity. Static electricity accumulation can not only attract environmental dust and contaminate the silicone PU surface material, but also has poor compatibility with inorganic fillers. Fillers such as talc added to improve the mechanical properties of the packaging barrel are prone to uneven dispersion due to insufficient interfacial bonding, which can reduce the tensile strength and impact resistance of the packaging barrel. Existing solutions have problems with single function and insufficient stability: direct addition of piperazine pyrophosphate is prone to agglomeration and precipitation upon contact with water, resulting in rapid decay of flame retardant effect; small molecule antistatic agents are prone to migration and loss, resulting in short antistatic effect; unmodified talc has poor compatibility with polypropylene, making it difficult to achieve synergistic improvement of flame retardancy, antistatic properties, and mechanical properties, and failing to meet the long-term use requirements of silicone PU packaging barrels. Summary of the Invention

[0003] The purpose of this invention is to provide a specially modified silicone PU packaging barrel and its preparation method to solve the problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A specially modified silicone PU packaging barrel and its preparation method are disclosed. The components of the specially modified silicone PU packaging barrel are as follows: 100 parts polypropylene resin, 2-8 parts polypropylene grafted maleic anhydride, 0.5-5 parts stabilizer, 1-3 parts titanium dioxide, 3-15 parts sepiolite fiber, 3-15 parts modified talc, and 1-5 parts lubricant.

[0005] Preferably, the modified talc powder is activated to enhance the activity of surface and interlayer double bonds, and then reacted with phosphoric acid to fix the phosphoric acid on the surface and between the layers of the talc powder. After that, it polymerizes with piperazine to generate piperazine pyrophosphate, thus preparing a talc-based flame retardant. Then, the modified talc powder is obtained by reacting the piperazine pyrophosphate contained in the talc-based flame retardant with an organosilicon antistatic agent.

[0006] Preferably, the organosilicon antistatic agent is prepared by reacting N,N-dimethylethanolamine with hexadecane bromo to generate a quaternary ammonium salt, and then reacting the quaternary ammonium salt with propyltriethoxysilane isocyanate to generate the organosilicon antistatic agent.

[0007] Preferably, the stabilizer is one or both of zinc stearate and calcium stearate.

[0008] Preferably, the lubricant is one or both of polyethylene wax and polypropylene wax.

[0009] 6. The specially modified silicone PU packaging barrel according to claim 1, wherein the polytetrafluoroethylene dispersion emulsion has a mass fraction of 60%.

[0010] A method for preparing a specially modified silicone PU packaging barrel, applicable to the aforementioned specially modified silicone PU packaging barrel, includes the following steps: S1. After activating talc powder, add it to deionized water at a mass ratio of 1:0.8~1 with phosphoric acid in a volume of 10~12 times the mass of talc powder. Stir and mix at 80~90℃ for 30~40 min. Then add piperazine at a mass ratio of 0.5~0.6 times the mass of phosphoric acid. Stir and dissolve, and continue to react for 2~3 h. After the reaction is complete, keep it warm and solidify. After the solidified product is cooled to room temperature, crush it and sieve it. Then place it in a tube furnace and heat treat it at 210~220℃ for 20~30 min. After the heat treatment is complete, wash it with deionized water 3~5 times and place it in a vacuum drying oven to dry it to obtain talc-based flame retardant. S2. Add talc-based flame retardant and organosilicon antistatic agent to xylene at a mass ratio of 2~2.2:0.8, which is 4~5 times the mass of talc-based flame retardant. Reflux the mixture at 100~105℃ for 1~2 hours, then raise the temperature to 140~145℃ and reflux for 8~9 hours. After the reaction is complete, cool to room temperature, filter, and wash with petroleum ether and N,N-dimethylformamide alternately 3~5 times before drying to obtain modified talc powder. S3. Weigh out 100 parts of polypropylene resin, 2-8 parts of polypropylene grafted maleic anhydride, 0.5-5 parts of stabilizer, 1-3 parts of titanium dioxide, 3-15 parts of sepiolite fiber, 3-15 parts of modified talc powder, and 1-5 parts of lubricant according to the following mass proportions. Add the above materials to a high-speed mixer and stir at 105-120℃ for 10-15 minutes. Then add the mixture to a twin-screw extruder for granulation and finally perform injection molding.

[0011] Preferably, the organosilicon antistatic agent comprises the following preparation steps: adding a quaternary ammonium salt to tetrahydrofuran at a mass of 6-8 times that of the quaternary ammonium salt; adding propyltriethoxysilane isocyanate at a mass of 0.5-0.6 times that of the quaternary ammonium salt and triethylamine at a mass of 0.2-0.3 times that of the quaternary ammonium salt at a temperature of 40-50°C; after the addition is complete, heating under total reflux for 8 hours; after the reaction is stopped, the solvent is evaporated; then the reaction product is added to a hexane solution and slurried; after slurrying, vacuum drying is carried out at a temperature of 60-70°C for 24-26 hours to obtain the organosilicon antistatic agent.

[0012] Preferably, the quaternary ammonium salt comprises the following preparation steps: N,N-dimethylethanolamine is added to acetone in a mass of 10 to 12 times that of N,N-dimethylethanolamine, and under condensation conditions, bromohexadecane in a mass of 3 to 4 times that of N,N-dimethylethanolamine is added dropwise. The reaction is carried out at a temperature of 40 to 50°C for 24 hours. After the reaction is completed, the mixture is washed with acetone 3 to 5 times and then vacuum dried for 12 hours to obtain the quaternary ammonium salt.

[0013] Preferably, the talc powder activation treatment includes the following steps: placing the talc powder in a muffle furnace and performing a constant-temperature activation pretreatment at a temperature of 350~360℃ for 2~3 hours, then removing it and cooling it to room temperature for later use.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are: In the technical solution adopted in this application, modified talc is applied to polypropylene, which can specifically solve the performance shortcomings of polypropylene, such as flammability and static electricity. First, when modified talc is loaded with piperazine pyrophosphate in a talc matrix, it can autonomously form an expanded char layer during combustion. At the same time, the subsequently grafted organosilicon antistatic agent has a synergistic effect with the silicon and phosphorus elements in the molecule, further enhancing the flame retardant effect and achieving high-efficiency flame retardancy. In addition, considering the difficulty of modifying talc due to its unique layered structure, this application pre-activates and exposes the originally encapsulated interlayer hydroxyl groups through high temperature, providing sufficient active sites for subsequent reaction with phosphoric acid. Ultimately, piperazine pyrophosphate is fixed in the interlayer and on the surface through polymerization between phosphoric acid and piperazine, avoiding the problem of flame retardants only adhering to the surface and easily falling off in traditional modification. Furthermore, fixing piperazine pyrophosphate can also effectively solve the problem of easy precipitation of piperazine pyrophosphate when it comes into contact with water. The subsequent reaction with organosilicon antistatic agent improves the compatibility between it and the polymer. At the same time, the hydrophobic properties of organosilicon inhibit the precipitation of piperazine pyrophosphate when it comes into contact with water, ultimately achieving no reduction in flame retardancy, no decrease in mechanical properties, and no loss of function. Furthermore, the quaternary ammonium salt groups of the organosilicon antistatic agent can adsorb moisture from the air, forming conductive channels on the surface and rapidly releasing static electricity. Simultaneously, the phosphorus element in ammonium polyphosphate and piperazine pyrophosphate itself possesses certain antistatic properties. The synergistic effect of these two elements allows the modified talc to exhibit both highly efficient and long-lasting antistatic properties, avoiding the problems of short-lived, easily precipitated, and easily degraded traditional antistatic agents. The molecular structure of the organosilicon antistatic agent exhibits bidirectional compatibility: one end is chemically bonded to piperazine pyrophosphate on the talc surface, while the long-chain alkyl group at the other end is entangled with the polymer matrix, effectively creating a molecular buffer layer between the inorganic talc-flame retardant component and the organic polymer, significantly reducing interfacial tension. Ultimately, this results in an effective improvement in the mechanical properties of the composite material even with high filler content. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1 S1. Place talc powder in a muffle furnace and activate it at 350℃ for 2 hours. After removal, cool it to room temperature for later use. Add the activated talc powder and phosphoric acid to 10 times the mass of talc powder in deionized water at a mass ratio of 1:0.8. Stir and mix at 80℃ for 30 minutes. Then add 0.5 times the mass of phosphoric acid in piperazine, stir to dissolve, and continue to react for 2 hours. After the reaction is complete, keep it at the temperature to solidify. After the solidified product is cooled to room temperature, crush it and sieve it. Then place it in a tube furnace and heat treat it at 210℃ for 20 minutes. After the heat treatment is complete, wash it three times with deionized water and dry it in a vacuum drying oven to obtain talc-based flame retardant. S2. N,N-dimethylethanolamine was added to acetone in 10 times the mass of N,N-dimethylethanolamine. The mixture was stirred and bromohexadecane in 3 times the mass of N,N-dimethylethanolamine was added dropwise under condensation. The mixture was reacted at 40°C for 24 h. After the reaction was completed, the mixture was washed three times with acetone and then dried under vacuum for 12 h to obtain the quaternary ammonium salt. S3. Add the quaternary ammonium salt to tetrahydrofuran at a mass of 6 times that of the quaternary ammonium salt. At a temperature of 40°C, add propyltriethoxysilane isocyanate at a mass of 0.5 times that of the quaternary ammonium salt and triethylamine at a mass of 0.2 times that of the quaternary ammonium salt. After the addition is complete, heat under total reflux for 8 hours. After the reaction stops, evaporate the solvent by rotary evaporation. Then, add the reaction product to a hexane solution and slurry it. After slurrying, vacuum dry it at a temperature of 60°C for 24 hours to obtain the organosilicon antistatic agent. S4. Add talc-based flame retardant and organosilicon antistatic agent to xylene at a mass ratio of 2:0.8, which is 4 times the mass of talc-based flame retardant. Reflux the mixture at 100℃ for 1 hour, then raise the temperature to 140℃ and reflux for 8 hours. After the reaction is complete, cool to room temperature, filter, and wash three times alternately with petroleum ether and N,N-dimethylformamide before drying to obtain modified talc powder. S5. Weigh out 100 parts of polypropylene resin, 2 parts of polypropylene grafted maleic anhydride, 0.5 parts of calcium stearate, 1 part of titanium dioxide, 3 parts of sepiolite fiber, 3 parts of modified talc powder and 1 part of polypropylene wax according to the following mass proportions. Add the above materials to a high-speed mixer and stir at 105°C for 10 minutes. Then add them to a twin-screw extruder for granulation.

[0017] Example 2 S1. Talc powder was placed in a muffle furnace and activated at 355℃ for 2.5 hours. After removal, it was cooled to room temperature for later use. The activated talc powder and phosphoric acid were added to 11 times the mass of talc powder in deionized water at a mass ratio of 1:0.9. The mixture was stirred and mixed at 85℃ for 35 minutes. Then, 0.55 times the mass of phosphoric acid in piperazine was added. After stirring and dissolving, the reaction was continued for 2.5 hours. After the reaction was completed, the mixture was kept at a constant temperature to solidify. After the solidified product was cooled to room temperature, it was pulverized and sieved. Then, it was placed in a tube furnace and heat-treated at 215℃ for 25 minutes. After the heat treatment, it was washed 4 times with deionized water and dried in a vacuum drying oven to obtain talc-based flame retardant. S2. N,N-dimethylethanolamine was added to acetone in 11 times the mass of N,N-dimethylethanolamine. Under condensation, the mixture was stirred and bromohexadecane in 3.5 times the mass of N,N-dimethylethanolamine was added dropwise. The mixture was reacted at 45°C for 24 h. After the reaction was completed, the mixture was washed 4 times with acetone and then dried under vacuum for 12 h to obtain the quaternary ammonium salt. S3. Add the quaternary ammonium salt to tetrahydrofuran at a mass of 7 times that of the quaternary ammonium salt. At a temperature of 45°C, add propyltriethoxysilane isocyanate at a mass of 0.55 times that of the quaternary ammonium salt and triethylamine at a mass of 0.25 times that of the quaternary ammonium salt. After the addition is complete, heat under total reflux for 8 hours. After the reaction stops, evaporate the solvent by rotary evaporation. Then, add the reaction product to a hexane solution and slurry it. After slurrying, vacuum dry it at a temperature of 65°C for 25 hours to obtain the organosilicon antistatic agent. S4. Add talc-based flame retardant and organosilicon antistatic agent to xylene at a mass ratio of 2.1:0.8, which is 4.5 times the mass of talc-based flame retardant. Reflux at 102.5℃ for 1.5 h, then raise the temperature to 142.5℃ and reflux for 8.5 h. After the reaction is complete, cool to room temperature, filter, and wash alternately with petroleum ether and N,N-dimethylformamide 4 times before drying to obtain modified talc powder. S5. Weigh out 100 parts of polypropylene resin, 5 parts of polypropylene grafted maleic anhydride, 2.75 parts of calcium stearate, 2 parts of titanium dioxide, 9 parts of sepiolite fiber, 9 parts of modified talc powder, and 3 parts of polypropylene wax according to the following mass fractions. Add the above materials to a high-speed mixer and stir at 110°C for 12 minutes. Then add the mixture to a twin-screw extruder for granulation.

[0018] Example 3 S1. Place talc powder in a muffle furnace and activate it at 360℃ for 3 hours. After removal, cool it to room temperature for later use. Add the activated talc powder and phosphoric acid to 12 times the mass of talc powder in deionized water at a mass ratio of 1:1. Stir and mix at 90℃ for 40 minutes. Then add 0.6 times the mass of phosphoric acid in piperazine, stir and dissolve, and continue to react for 3 hours. After the reaction is complete, keep it at the temperature to solidify. After the solidified product is cooled to room temperature, crush it and sieve it. Then place it in a tube furnace and heat treat it at 220℃ for 30 minutes. After the heat treatment is complete, wash it 5 times with deionized water and dry it in a vacuum drying oven to obtain talc-based flame retardant. S2. N,N-dimethylethanolamine was added to acetone in 12 times the mass of N,N-dimethylethanolamine. Under condensation, the mixture was stirred and bromohexadecane in 4 times the mass of N,N-dimethylethanolamine was added dropwise. The mixture was reacted at 50°C for 24 h. After the reaction was completed, the mixture was washed 5 times with acetone and then dried under vacuum for 12 h to obtain the quaternary ammonium salt. S3. Add the quaternary ammonium salt to tetrahydrofuran at a mass of 8 times that of the quaternary ammonium salt. At a temperature of 50°C, add propyltriethoxysilane isocyanate at a mass of 0.6 times that of the quaternary ammonium salt and triethylamine at a mass of 0.3 times that of the quaternary ammonium salt. After the addition is complete, heat under total reflux for 8 hours. After the reaction stops, evaporate the solvent by rotary evaporation. Then, add the reaction product to a hexane solution and slurry it. After slurrying, vacuum dry it at a temperature of 70°C for 26 hours to obtain the organosilicon antistatic agent. S4. Add talc-based flame retardant and organosilicon antistatic agent to xylene at a mass ratio of 2.2:0.8, which is 5 times the mass of talc-based flame retardant. Reflux the mixture at 105℃ for 2 hours, then raise the temperature to 145℃ and reflux for 9 hours. After the reaction is complete, cool to room temperature, filter, and wash the mixture 5 times alternately with petroleum ether and N,N-dimethylformamide before drying to obtain modified talc powder. S5. Weigh out 100 parts of polypropylene resin, 8 parts of polypropylene grafted maleic anhydride, 5 parts of calcium stearate, 3 parts of titanium dioxide, 15 parts of sepiolite fiber, 15 parts of modified talc powder, and 5 parts of polypropylene wax according to the following mass proportions. Add the above materials to a high-speed mixer and stir at 120°C for 15 minutes. Then add them to a twin-screw extruder for granulation.

[0019] Example 4 The only difference from Example 2 is step S5: Weigh 100 parts of polypropylene resin, 5 parts of polypropylene grafted maleic anhydride, 2.75 parts of calcium stearate, 2 parts of titanium dioxide, 9 parts of sepiolite fiber, 9 parts of talc-based flame retardant and 3 parts of polypropylene wax according to the following mass parts: add the above materials to a high-speed mixer and stir at 110°C for 12 minutes, and then add them to a twin-screw extruder for granulation. Example 5 The only difference from Example 2 is step S5: Weigh 100 parts of polypropylene resin, 5 parts of polypropylene grafted maleic anhydride, 2.75 parts of calcium stearate, 2 parts of titanium dioxide, 9 parts of sepiolite fiber, 9 parts of piperazine pyrophosphate and 3 parts of polypropylene wax according to the mass fractions, add the above materials to a high-speed mixer, stir at 110°C for 12 minutes, and then add them to a twin-screw extruder for granulation. Example 6 The only difference from Example 2 is step S5: Weigh 100 parts of polypropylene resin, 5 parts of polypropylene grafted maleic anhydride, 2.75 parts of calcium stearate, 2 parts of titanium dioxide, 9 parts of sepiolite fiber, 9 parts of talc powder and 3 parts of polypropylene wax according to the mass fractions, add the above materials to a high-speed mixer, stir at 110°C for 12 minutes, and then add them to a twin-screw extruder for granulation. Example 7 The only difference from Example 2 is step S4: talc-based flame retardant and propyltriethoxysilane isocyanate are added to xylene at a mass ratio of 2.1:0.8 to 4.5 times the mass of talc-based flame retardant. The mixture is refluxed at 102.5°C for 1.5 h, then heated to 142.5°C and refluxed for 8.5 h. After the reaction is complete, the mixture is cooled to room temperature, filtered, and washed four times alternately with petroleum ether and N,N-dimethylformamide before drying to obtain modified talc powder. Example 8 The only difference from Example 2 is step S4: talc-based flame retardant and quaternary ammonium salt are added to xylene at a mass ratio of 2.1:0.8 to 4.5 times the mass of talc-based flame retardant. The mixture is refluxed at 102.5°C for 1.5 h, then heated to 142.5°C and refluxed for 8.5 h. After the reaction is complete, the mixture is cooled to room temperature, filtered, and washed four times alternately with petroleum ether and N,N-dimethylformamide before drying to obtain modified talc powder. Limiting oxygen index test Standard test specimens were prepared according to GB / T 2406.1-2008. The limiting oxygen index (LOI) of the composite flame-retardant material was determined using a digital oxygen index meter. The specimen dimensions were 120*6.5*3mm. 3 The oxygen concentration was adjusted and measured 10 times; the experimental results are shown in Table 1.

[0020] Mechanical strength test Standard specimens were prepared according to GB / T 1043.1-2008. The tensile strength and elongation at break of the composite material were tested using an electronic tensile testing machine at a tensile speed of 200 mm / min. The experimental results are shown in Table 1.

[0021] Water washing antistatic ability test After rinsing and wiping the sample with distilled water for 1 minute, the sample was placed in a constant temperature and humidity chamber at 23℃ and 45%RH for 48 hours, and then the surface resistivity of the sample was measured. The surface resistivity of the sample was measured after 5, 10, and 15 water washes, and the experimental results are shown in Table 2. The experimental results are shown in Table 1 below; Table 1 As shown in Table 1, Examples 1-3, employing a complete modification scheme, achieved a limiting oxygen index (LOI) of 31.8%-32.5%, significantly higher than that of pure polypropylene, classifying them as flame-retardant. Furthermore, their tensile strength remained stable at 17.74-18.54 MPa, and their elongation at break remained consistent, demonstrating stable mechanical properties without degradation. However, Examples 4-8, due to incomplete modification (e.g., lack of organosilicon grafting or substitution with a single component), experienced a sharp drop in LOI to 17.8%-28.4%, with varying degrees of decrease in tensile strength and elongation at break. In contrast, Examples 6, 7, and 8 showed LOIs approaching those of pure polypropylene, fully demonstrating the necessity of a complete modification scheme for synergistic improvement in flame retardancy and mechanical properties.

[0022] Table 2 As shown in Table 2, the initial surface resistivity of Examples 1-3 is 8.27~8.71×10⁻⁶. 13 Ω / sq, the antistatic efficiency is significantly higher than that of Examples 4-8 (12.38-13.86×10). 13 The resistivity of Examples 1-3 increased slowly and changed very little after 5, 10, and 15 washes (Ω / sq). This is because the organosilicon antistatic agent is anchored to the surface of talc powder through chemical bonds, preventing it from being washed away. At the same time, phosphorus assists in conductivity. However, Examples 4-8 lacked organosilicon antistatic agent and had poor initial antistatic properties. Although the resistivity increased slightly after washing, it remained in the low-efficiency range, which confirms the key role of organosilicon antistatic agent in improving antistatic efficiency and durability.

[0023] 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 its spirit or essential characteristics. 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, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A specially designed modified silicone PU packaging bucket, characterized in that, The modified silicone PU special packaging barrel has the following components in parts by weight: 100 parts polypropylene resin, 2-8 parts polypropylene grafted maleic anhydride, 0.5-5 parts stabilizer, 1-3 parts titanium dioxide, 3-15 parts sepiolite fiber, 3-15 parts modified talc, and 1-5 parts lubricant.

2. The specially modified silicone PU packaging barrel according to claim 1, characterized in that, The modified talc powder is activated to enhance the activity of surface and interlayer double bonds, and then reacts with phosphoric acid to fix the phosphoric acid on the surface and between the layers of the talc powder. After that, it polymerizes with piperazine to generate piperazine pyrophosphate, thus preparing a talc-based flame retardant. Then, the modified talc powder is obtained by reacting the piperazine pyrophosphate contained in the talc-based flame retardant with an organosilicon antistatic agent.

3. The specially modified silicone PU packaging barrel according to claim 2, characterized in that, The organosilicon antistatic agent is prepared by reacting N,N-dimethylethanolamine with hexadecane bromo to generate a quaternary ammonium salt, which is then reacted with propyltriethoxysilane isocyanate to generate the organosilicon antistatic agent.

4. The specially modified silicone PU packaging barrel according to claim 1, characterized in that, The stabilizer is one or both of zinc stearate and calcium stearate.

5. The specially modified silicone PU packaging barrel according to claim 1, characterized in that, The lubricant is one or both of polyethylene wax and polypropylene wax.

6. A method for preparing a specially modified silicone PU packaging barrel, applicable to the specially modified silicone PU packaging barrel according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. After activating talc powder, add it to deionized water at a mass ratio of 1:0.8~1 with phosphoric acid in a volume of 10~12 times the mass of talc powder. Stir and mix at 80~90℃ for 30~40 min. Then add piperazine at a mass ratio of 0.5~0.6 times the mass of phosphoric acid. Stir and dissolve, and continue to react for 2~3 h. After the reaction is complete, keep it warm and solidify. After the solidified product is cooled to room temperature, crush it and sieve it. Then place it in a tube furnace and heat treat it at 210~220℃ for 20~30 min. After the heat treatment is complete, wash it with deionized water 3~5 times and place it in a vacuum drying oven to dry it to obtain talc-based flame retardant. S2. Add talc-based flame retardant and organosilicon antistatic agent to xylene at a mass ratio of 2~2.2:0.8, which is 4~5 times the mass of talc-based flame retardant. Reflux the mixture at 100~105℃ for 1~2 hours, then raise the temperature to 140~145℃ and reflux for 8~9 hours. After the reaction is complete, cool to room temperature, filter, and wash with petroleum ether and N,N-dimethylformamide alternately 3~5 times before drying to obtain modified talc powder. S3. Weigh out 100 parts of polypropylene resin, 2-8 parts of polypropylene grafted maleic anhydride, 0.5-5 parts of stabilizer, 1-3 parts of titanium dioxide, 3-15 parts of sepiolite fiber, 3-15 parts of modified talc powder, and 1-5 parts of lubricant according to the following mass proportions. Add the above materials to a high-speed mixer and stir at 105-120℃ for 10-15 minutes. Then add the mixture to a twin-screw extruder for granulation and finally perform injection molding.

7. The method for preparing the specially modified silicone PU packaging barrel according to claim 6, characterized in that, The organosilicon antistatic agent comprises the following preparation steps: adding a quaternary ammonium salt to tetrahydrofuran at 6-8 times its mass; adding propyltriethoxysilane isocyanate at 0.5-0.6 times its mass and triethylamine at 0.2-0.3 times its mass under quaternary ammonium salt at a temperature of 40-50°C; heating under total reflux for 8 hours after the addition is complete; drying the solvent by rotary evaporation after the reaction is stopped; then adding the reaction product to a hexane solution and slurrying; and finally vacuum drying under vacuum at 60-70°C for 24-26 hours to obtain the organosilicon antistatic agent.

8. The method for preparing the specially modified silicone PU packaging barrel according to claim 7, characterized in that, The quaternary ammonium salt is prepared by the following steps: N,N-dimethylethanolamine is added to acetone at a mass of 10 to 12 times that of N,N-dimethylethanolamine, and under condensation conditions, hexadecane bromobromoacetate at a mass of 3 to 4 times that of N,N-dimethylethanolamine is added dropwise. The reaction is carried out at a temperature of 40 to 50°C for 24 hours. After the reaction is completed, the mixture is washed with acetone 3 to 5 times and then dried under vacuum for 12 hours to obtain the quaternary ammonium salt.

9. The method for preparing the specially modified silicone PU packaging barrel according to claim 6, characterized in that, The talc powder activation treatment includes the following steps: placing the talc powder in a muffle furnace and performing a constant-temperature activation pretreatment at a temperature of 350~360℃ for 2~3 hours, then removing it and cooling it to room temperature for later use.

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