A toughened drop-resistant plastic bucket and a method of manufacturing the same

Abstract

This invention discloses a toughened and drop-resistant plastic bucket and its preparation method, belonging to the field of plastic bucket technology. The method includes modified polyisobutylene granules, activated sepiolite fibers, activated modified diatomaceous earth, filler preparation, premixing materials, and injection molding. By grafting maleic anhydride onto the polyisobutylene, the overall structural toughness of the plastic bucket is enhanced. Simultaneously, a specific ratio of activated sepiolite fibers and activated modified diatomaceous earth is used to form a synergistic and complementary support structure, strengthening the internal structure of the material and significantly improving the product's drop resistance. This allows the plastic bucket to maintain stable structural integrity even in harsh environments such as low temperatures, effectively avoiding damage caused by drops during use, significantly reducing the risk of damage during transportation, handling, and use, and extending the product's service life.

Description

Technical Field

[0001] This invention relates to the field of plastic bucket technology, specifically to a toughened and impact-resistant plastic bucket and its preparation method. Background Technology

[0002] Polyethylene (PE) plastic drums are widely used in various scenarios such as chemical raw material storage, food packaging, and daily necessities transportation due to their good chemical stability, low-temperature resistance, and cost-effectiveness. In actual use, frequent occurrences such as being thrown and dropped during logistics loading and unloading, bumping and collisions during long-distance transportation, and alternating high and low temperatures in outdoor environments place stringent requirements on the toughness and impact resistance of plastic drums.

[0003] Currently, conventional PE plastic drums have significant drawbacks in these practical scenarios. For example, if they are accidentally dropped from forklifts or shelves during loading and unloading, the drum body is prone to cracking and bottom damage, leading to leakage of internal materials, causing economic losses and environmental risks. During long-distance transportation, the squeezing and collision between drums can cause dents and bulges in the drum walls, and in severe cases, direct damage, affecting subsequent use. In low-temperature environments (such as outdoor transportation in winter or cold chain transportation), the toughness of the drum body decreases significantly, making it prone to cracking upon impact, and even breakage at the joints. This not only reduces the service life of plastic drums but also increases safety hazards and additional costs in material storage and transportation, failing to meet the core requirements of downstream industries for stable and durable packaging containers.

[0004] Based on this, the present invention designs a toughened and impact-resistant plastic bucket and its preparation method to solve the above problems. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a method for preparing a toughened and impact-resistant plastic bucket, comprising the following steps:

[0006] S1: Weigh 85-90 parts by weight of polyisobutylene, 6-9 parts by weight of maleic anhydride, 0.8-1.5 parts by weight of initiator and 0.2-0.4 parts by weight of antioxidant;

[0007] S2: Premix polyisobutylene with maleic anhydride, add initiator and antioxidant, continue stirring to obtain a mixture, feed the mixture into a twin-screw extruder, extrude, cool and pelletize to obtain modified polyisobutylene granules;

[0008] S3: Weigh 80-90 parts by weight of sepiolite fiber, heat to 108-118℃ and keep warm; then heat to 124-131℃, keep warm, cool and add 3-6 parts by weight of silane coupling agent and 2-4 parts by weight of polyethylene glycol, stir, vacuum dry to obtain activated sepiolite fiber.

[0009] S4: Weigh 10-20 parts of diatomaceous earth by weight, completely immerse the diatomaceous earth in phosphoric acid solution and stir, wash until neutral, filter and dry to obtain activated modified diatomaceous earth;

[0010] S5: The filler is obtained by mixing activated sepiolite fiber and activated modified diatomaceous earth at a mass ratio of 4-6:1;

[0011] S6: By weight, weigh 85-95 parts high-density polyethylene, 12-18 parts modified polyisobutylene granules, 18-22 parts filler, 6-10 parts ethylene-octene copolymer, 0.4-0.8 parts crosslinking agent and 0.6-1.2 parts pigment;

[0012] S7: First, add high-density polyethylene, modified polyisobutylene particles, and ethylene-octene copolymer to a high-speed mixer in sequence and mix. Then add filler, crosslinking agent, and pigment and continue mixing. The mixed material is filtered to obtain a premixed material.

[0013] S8: The premixed material is fed into the extruder and extruded and water-cooled into pellets to obtain composite pellets;

[0014] S9: The composite granules are added to the injection molding machine barrel. After mold closing, injection molding, pressure holding, and cooling, the mold is opened to obtain a plastic bucket blank. The bucket blank is then processed by a deburring machine and surface sterilization to obtain a toughened and impact-resistant plastic bucket.

[0015] Furthermore, in S1, the initiator is diluted with anhydrous ethanol, and the mass ratio of the initiator to anhydrous ethanol is 1:2-2.8.

[0016] Furthermore, S2 specifically involves: adding polyisobutylene and maleic anhydride to a high-speed mixer and premixing for 8-12 minutes at a speed of 600-800 r / min and a temperature of 50-60°C; adding antioxidants and diluted initiators; continuing to stir for 3-5 minutes to obtain a mixture; feeding the mixture into a twin-screw extruder; conveying it at 25-30 r / min at a temperature of 130-140°C in the feeding section; melting it at 35-40 r / min at a temperature of 150-170°C in the plasticizing section; reacting it at 40-45 r / min at a temperature of 175-185°C in the reaction section for 6-8 minutes; and extruding it through the die head at 12-15 MPa at a temperature of 165-175°C in the die head section. The mixture is then transferred to a cooling water bath at a temperature of 20-30°C for 15-20 seconds and pulled to a pelletizer at 3-5 m / min by a traction machine to be cut into particles with a particle size of 2-3 mm to obtain modified polyisobutylene particles.

[0017] Furthermore, S3 specifically involves: weighing 80-90 parts by weight of sepiolite fiber, raising the temperature to 108-118℃ at 3-5℃ / min, and holding it at that temperature for 1-1.5 hours; then raising the temperature to 124-131℃ at 1-3℃ / min, holding it at that temperature for 1-2 hours, and then naturally cooling it to room temperature. The mixture is then transferred to a high-speed mixer, and 3-6 parts by weight of silane coupling agent and 2-4 parts by weight of polyethylene glycol are added. The mixture is stirred at 1200-1500 r / min and 70-80℃ for 1.5-2 hours, then transferred to a vacuum drying oven and dried at 80-90℃ and a vacuum of -0.08 to -0.06 MPa for 2-3 hours to obtain activated sepiolite fiber.

[0018] Furthermore, S4 specifically involves: weighing 10-20 parts of diatomaceous earth by weight, completely immersing the diatomaceous earth in a 5-8 wt% phosphoric acid solution, stirring for 2-3 hours at a temperature of 60-70℃ and a rotation speed of 200-300 r / min, washing with deionized water until neutral, filtering through a 300-400 mesh sieve, and then placing it in a forced-air drying oven to dry at 100-110℃ for 4-5 hours to obtain activated modified diatomaceous earth.

[0019] Furthermore, S5 specifically involves mixing activated sepiolite fibers and activated modified diatomaceous earth at a mass ratio of 4-6:1, adding the mixture to a high-speed mixer, and stirring at 800-1000 r / min and 50-60℃ for 30-40 min to obtain the filler.

[0020] Furthermore, S7 specifically involves: first, adding high-density polyethylene, modified polyisobutylene particles, and ethylene-octene copolymer sequentially to a high-speed mixer, mixing at 70-80℃ and 700-900r / min for 15-20min, then adding fillers, crosslinking agents, and pigments, cooling to 50-60℃ at 2-5℃ / min, and continuing to mix for 10-15min. The mixed material is then filtered through a 40-60 mesh sieve and transferred to a storage tank to obtain the premixed material.

[0021] Furthermore, S8 specifically involves feeding premixed materials into an extruder, passing through a feeding section at 160-170℃, a plasticizing section at 180-190℃, a homogenizing section at 195-205℃, a pressure of 18-22MPa, and a die head section at 185-195℃, extruding through a die head at 400-600mm / min, and then water-cooling at 10-15℃ and pelletizing to obtain composite granules.

[0022] A toughened and impact-resistant plastic bucket prepared according to the preparation method described above.

[0023] Compared with the prior art, the beneficial effects of this invention are as follows:

[0024] 1. This invention enhances the overall structural toughness of the plastic bucket by grafting maleic anhydride onto polyisobutylene. Simultaneously, a synergistic and complementary support structure is formed by blending activated sepiolite fiber and activated modified diatomaceous earth in a specific ratio, strengthening the internal structure of the material and significantly improving the product's drop resistance. This allows the plastic bucket to maintain stable structural integrity even in harsh environments such as low temperatures, effectively preventing damage caused by drops during use, greatly reducing the risk of damage during transportation, handling, and use, and extending the product's lifespan.

[0025] 2. This invention, through modification of polyisobutylene and reasonable control of the amount of ethylene-octene copolymer added, fully leverages its toughening effect, effectively improving the material's flexibility and resistance to deformation, thereby significantly optimizing the plastic bucket's compression resistance. This allows the plastic bucket to withstand deformation and damage caused by external pressure in complex scenarios such as storage stacking and transportation compression, ensuring the safety of the bucket body and its contents. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Example 1: This example discloses a method for preparing a toughened and impact-resistant plastic bucket, including the following steps:

[0028] S1: Weigh 85 parts by weight of polyisobutylene (Shandong Shoucheng Chemical Co., Ltd., brand name PB1400), 6 parts by weight of maleic anhydride, 0.8 parts by weight of initiator (di-tert-butyl peroxide) and 0.2 parts by weight of antioxidant (L-ascorbate palmitate).

[0029] The initiator was diluted with anhydrous ethanol (the mass ratio of initiator to anhydrous ethanol was 1:2).

[0030] S2: Add polyisobutylene and maleic anhydride to a high-speed mixer and premix for 8 minutes at 600 r / min and 50°C. Add antioxidant and diluted initiator and continue stirring for 3 minutes to obtain a mixture. Feed the mixture into a twin-screw extruder. It is conveyed at 25 r / min in the feeding section (zone 1) at 130-140°C, melted at 35 r / min in the plasticizing section (zones 2-3) at 150-170°C, reacted at 40 r / min in the reaction section (zones 4-5) at 175-185°C for 6 minutes, and extruded through the die head at 12 MPa in the die head section (zone 6) at 165-175°C. It is then transferred to a 20°C cooling water bath for 15 seconds and pulled to a pelletizer at 3 m / min by a traction machine to be cut into particles with a particle size of 2-3 mm to obtain modified polyisobutylene particles.

[0031] S3: Weigh 80 parts by weight of sepiolite fiber (Shijiazhuang Quanxin Insulation Building Materials Co., Ltd.), heat to 108℃ at 3℃ / min, and keep warm for 1 hour; then heat to 124℃ at 1℃ / min, keep warm for 1 hour, and then cool naturally to room temperature. Transfer to a high-speed mixer, add 3 parts by weight of silane coupling agent (KH560) and 2 parts by weight of polyethylene glycol (PEG400), stir at 1200r / min and 70℃ for 1.5 hours, transfer to a vacuum drying oven, and dry at 80℃ and a vacuum degree of -0.08MPa for 2 hours to obtain activated sepiolite fiber;

[0032] S4: Weigh 10 parts of diatomaceous earth (Shijiazhuang Niushang Mineral Products Co., Ltd.) by weight, completely immerse the diatomaceous earth in a 5wt% phosphoric acid solution, stir for 2 hours at 60℃ and 200r / min, wash with deionized water until neutral, filter through a 300-400 mesh sieve, and place in a forced-air drying oven to dry at 100℃ for 4 hours to obtain activated modified diatomaceous earth;

[0033] S5: Mix activated sepiolite fiber and activated modified diatomite at a mass ratio of 4:1, add to a high-speed mixer, and stir for 30 minutes at 800 r / min and 50℃ to obtain the filler;

[0034] S6: By weight, weigh 85 parts high-density polyethylene (Suzhou Huasulian Plastic Technology Co., Ltd., model PX2246), 12 parts modified polyisobutylene granules, 18 parts filler, 6 parts ethylene-octene copolymer (Shanghai Haikuo International Trade Co., Ltd.), 0.4 parts crosslinking agent (trimethylolpropane triacrylate) and 0.6 parts pigment;

[0035] S7: First, add high-density polyethylene, modified polyisobutylene particles, and ethylene-octene copolymer to a high-speed mixer in sequence, mix at 70℃ and 700r / min for 15min, add filler, crosslinking agent and pigment, cool down to 50℃ at 2℃ / min, continue mixing for 10min, filter the mixed material through a 40-60 mesh sieve and transfer it to a storage tank to obtain premixed material;

[0036] S8: A horizontal single-screw extruder (screw length-to-diameter ratio 28:1, compression ratio 3.2:1) is selected. The premixed material is fed into the extruder and passed through the feeding section at 160-170℃, the plasticizing section at 180-190℃, the homogenizing section at 195-205℃, the pressure at 18MPa, and the die head section at 185-195℃. The material is then extruded through a die head at 400mm / min, cooled in water at 10℃, and pelletized to obtain composite granules.

[0037] S9: The composite granules are added to the injection molding machine barrel. After mold closing, injection, pressure holding, and cooling, the mold is opened. The barrel temperature is 175℃, the mold is preheated to 60℃, the injection pressure is 100MPa, the pressure holding pressure is 50MPa, the pressure holding time is 5s, and the cooling time is 15s to obtain a plastic bucket blank. The bucket blank is processed by a deburring machine. At a blade speed of 1500r / min, the residual material at the mold opening is removed. It is then sent to an ultraviolet sterilizer (wavelength 254nm, irradiation time 30s) for surface sterilization to obtain a toughened and impact-resistant plastic bucket.

[0038] Example 2: This example discloses a method for preparing a toughened and impact-resistant plastic bucket, including the following steps:

[0039] S1: Weigh 90 parts by weight of polyisobutylene (Shandong Shoucheng Chemical Co., Ltd., brand name PB1400), 9 parts by weight of maleic anhydride, 1.5 parts by weight of initiator (di-tert-butyl peroxide) and 0.4 parts by weight of antioxidant (L-ascorbate palmitate).

[0040] The initiator was diluted with anhydrous ethanol (the mass ratio of initiator to anhydrous ethanol was 1:2.8).

[0041] S2: Add polyisobutylene and maleic anhydride to a high-speed mixer and premix for 12 minutes at 800 r / min and 60°C. Add antioxidant and diluted initiator and continue stirring for 5 minutes to obtain a mixture. Feed the mixture into a twin-screw extruder. It is conveyed in the feeding section (zone 1) at 130-140°C at 30 r / min, melted in the plasticizing section (zones 2-3) at 150-170°C at 40 r / min, reacted in the reaction section (zones 4-5) at 175-185°C at 45 r / min for 8 minutes, and extruded through the die head section (zone 6) at 165-175°C at 15 MPa. It is then transferred to a 30°C cooling water bath for 20 seconds and pulled to a pelletizer at 5 m / min by a traction machine to be cut into particles with a particle size of 2-3 mm to obtain modified polyisobutylene particles.

[0042] S3: Weigh 90 parts by weight of sepiolite fiber (Shijiazhuang Quanxin Insulation Building Materials Co., Ltd.), heat to 118℃ at 5℃ / min, and keep warm for 1.5h; then heat to 131℃ at 3℃ / min, keep warm for 2h, and then cool naturally to room temperature. Transfer to a high-speed mixer, add 6 parts by weight of silane coupling agent (KH560) and 4 parts by weight of polyethylene glycol (PEG400), stir at 1500r / min and 80℃ for 2h, transfer to a vacuum drying oven, and dry at 90℃ and vacuum degree -0.06MPa for 3h to obtain activated sepiolite fiber;

[0043] S4: Weigh 20 parts of diatomaceous earth (Shijiazhuang Niushang Mineral Products Co., Ltd.) by weight, completely immerse the diatomaceous earth in an 8wt% phosphoric acid solution, stir for 3 hours at 70℃ and 300r / min, wash with deionized water until neutral, filter through a 300-400 mesh sieve, and place in a forced-air drying oven to dry at 110℃ for 5 hours to obtain activated modified diatomaceous earth;

[0044] S5: Mix activated sepiolite fiber and activated modified diatomite at a mass ratio of 6:1, add to a high-speed mixer, and stir at 1000 r / min and 60℃ for 40 min to obtain the filler;

[0045] S6: By weight, weigh 95 parts high-density polyethylene (Suzhou Huasulian Plastics Technology Co., Ltd., model PX2246), 18 parts modified polyisobutylene granules, 22 parts filler, 10 parts ethylene-octene copolymer (Shanghai Haikuo International Trade Co., Ltd.), 0.8 parts crosslinking agent (trimethylolpropane triacrylate) and 1.2 parts pigment;

[0046] S7: First, add high-density polyethylene, modified polyisobutylene particles, and ethylene-octene copolymer to a high-speed mixer in sequence, mix at 80℃ and 900r / min for 20min, add filler, crosslinking agent and pigment, cool down to 60℃ at 5℃ / min, continue mixing for 15min, filter the mixed material through a 40-60 mesh sieve and transfer it to a storage tank to obtain premixed material;

[0047] S8: A horizontal single-screw extruder (screw length-to-diameter ratio 28:1, compression ratio 3.2:1) is selected. The premixed material is fed into the extruder, passing through the feeding section at 160-170℃, the plasticizing section at 180-190℃, the homogenizing section at 195-205℃, the pressure at 22MPa, and the die head section at 185-195℃. The material is then extruded through a die head at 600mm / min, and after water cooling at 15℃ and pelletizing, composite granules are obtained.

[0048] S9: The composite granules are added to the injection molding machine barrel. After mold closing, injection, pressure holding, and cooling, the mold is opened. The barrel temperature is 182℃, the mold is preheated to 75℃, the injection pressure is 120MPa, the pressure holding pressure is 60MPa, the pressure holding time is 10s, and the cooling time is 30s to obtain a plastic bucket blank. The bucket blank is processed by a deburring machine. At a blade speed of 2000r / min, the residual material at the mold opening is removed. It is then sent to an ultraviolet sterilizer (wavelength 254nm, irradiation time 60s) for surface sterilization to obtain a toughened and impact-resistant plastic bucket.

[0049] Example 3: This example discloses a method for preparing a toughened and impact-resistant plastic bucket, including the following steps:

[0050] S1: Weigh 88 parts by weight of polyisobutylene (Shandong Shoucheng Chemical Co., Ltd., brand name PB1400), 7.8 parts by weight of maleic anhydride, 1.2 parts by weight of initiator (di-tert-butyl peroxide) and 0.3 parts by weight of antioxidant (L-ascorbate palmitate).

[0051] The initiator was diluted with anhydrous ethanol (the mass ratio of initiator to anhydrous ethanol was 1:2.4).

[0052] S2: Add polyisobutylene and maleic anhydride to a high-speed mixer and premix for 10 minutes at 720 r / min and 56°C. Add antioxidant and diluted initiator and continue stirring for 4 minutes to obtain a mixture. Feed the mixture into a twin-screw extruder. It is conveyed in the feeding section (zone 1) at 130-140°C at 25-30 r / min, melted in the plasticizing section (zones 2-3) at 150-170°C at 35-40 r / min, reacted in the reaction section (zones 4-5) at 175-185°C at 42 r / min for 7 minutes, and extruded through the die head section (zone 6) at 165-175°C at 13 MPa. It is then transferred to a 24°C cooling water bath for 17 seconds and pulled to a pelletizer at 4 m / min by a traction machine to be cut into particles with a particle size of 2-3 mm to obtain modified polyisobutylene particles.

[0053] S3: Weigh 84 parts by weight of sepiolite fiber (Shijiazhuang Quanxin Insulation Building Materials Co., Ltd.), heat to 110℃ at 4℃ / min, and keep warm for 1 hour; then heat to 128℃ at 2℃ / min, keep warm for 1 hour, and then cool naturally to room temperature. Transfer to a high-speed mixer, add 4.7 parts by weight of silane coupling agent (KH560) and 3.6 parts by weight of polyethylene glycol (PEG400), stir at 1400r / min and 74℃ for 2 hours, transfer to a vacuum drying oven, and dry at 83℃ and vacuum degree -0.06MPa for 2 hours to obtain activated sepiolite fiber;

[0054] S4: Weigh 17 parts by weight of diatomaceous earth (Shijiazhuang Niushang Mineral Products Co., Ltd.), completely immerse the diatomaceous earth in a 6.8wt% phosphoric acid solution, stir for 3 hours at 66℃ and 260r / min, wash with deionized water until neutral, filter through a 300-400 mesh sieve, and place in a forced-air drying oven to dry at 107℃ for 4.5 hours to obtain activated modified diatomaceous earth;

[0055] S5: Mix activated sepiolite fiber and activated modified diatomaceous earth at a mass ratio of 5.4:1, add to a high-speed mixer, and stir for 37 minutes at 950 r / min and 55℃ to obtain the filler;

[0056] S6: By weight, weigh 91 parts high-density polyethylene (Suzhou Huasulian Plastics Technology Co., Ltd., model PX2246), 16 parts modified polyisobutylene granules, 21 parts filler, 8.6 parts ethylene-octene copolymer (Shanghai Haikuo International Trade Co., Ltd.), 0.6 parts crosslinking agent (trimethylolpropane triacrylate) and 1 part pigment.

[0057] S7: First, add high-density polyethylene, modified polyisobutylene particles, and ethylene-octene copolymer to a high-speed mixer in sequence, mix at 77℃ and 860r / min for 18min, add filler, crosslinking agent and pigment, cool down to 53℃ at 5℃ / min, continue mixing for 12min, filter the mixed material through a 40-60 mesh sieve and transfer it to a storage tank to obtain premixed material;

[0058] S8: A horizontal single-screw extruder (screw length-to-diameter ratio 28:1, compression ratio 3.2:1) is selected. The premixed material is fed into the extruder and passed through the feeding section at 160-170℃, the plasticizing section at 180-190℃, the homogenizing section at 195-205℃, the pressure at 18-22MPa, and the die head section at 185-195℃. It is then extruded through a die head at 600mm / min, and after water cooling at 12℃ and pelletizing, composite granules are obtained.

[0059] S9: The composite granules are added to the injection molding machine barrel. After mold closing, injection, pressure holding, and cooling, the mold is opened. The barrel temperature is 178℃, the mold is preheated to 73℃, the injection pressure is 110MPa, the pressure holding pressure is 55MPa, the pressure holding time is 8s, and the cooling time is 24s to obtain a plastic bucket blank. The bucket blank is processed by a deburring machine. At a blade speed of 1800r / min, the residual material at the mold opening is removed. It is then sent to an ultraviolet sterilizer (wavelength 254nm, irradiation time 55s) for surface sterilization to obtain a toughened and impact-resistant plastic bucket.

[0060] Comparative Example 1: The difference between this comparative example and Example 3 is that S2 was not performed, that is, the polyisobutylene was not modified.

[0061] Comparative Example 2: The difference between this comparative example and Example 3 is that in S5, the filler is activated sepiolite fiber, that is, it does not contain activated modified diatomaceous earth.

[0062] Comparative Example 3: The difference between this comparative example and Example 3 is that in S6, the ethylene-octene copolymer is 2 parts.

[0063] The pigments used in Examples 1-3 and Comparative Examples 1-3 above are BASF Heliogen Blue K6911, rutile-based DuPont titanium dioxide R-902+, 112 permanent red FGR, or quinacridone pigment yellow 110.

[0064] Experimental Example 1: After testing, the toughened and impact-resistant plastic buckets prepared in the examples and comparative examples all meet the requirements of GB 4806.7-2023 "National Food Safety Standard for Plastic Materials and Products for Food Contact";

[0065] Experimental Example 2: The drop performance of the toughened and drop-resistant plastic bucket prepared by the present invention was tested according to GB / T 43198-2023 at room temperature and -20℃. The bucket was fully filled with water, and the drop heights H0 and H1 (m) of the bucket were recorded when it broke or the lid shattered.

[0066] Experimental Example 3: The compression resistance of the toughened and impact-resistant plastic bucket prepared by the present invention was tested according to GB / T 1041-2008, and the compressive stress (MPa) at the time of sample breakage was recorded.

[0067] The results are shown in the table below:

[0068] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 <![CDATA[H0(m)]]> 2.8 2.8 2.8 2.5 2.7 2.7 <![CDATA[H1(m)]]> 2.6 2.6 2.6 2.5 2.2 2.4 Compressive stress (MPa) 37.5 37.2 37.3 36.2 36.8 32.1

[0069] As shown in the table above, maleic anhydride grafting modification of polyisobutylene can enhance its compatibility with other substrates, thereby improving the overall toughness of the plastic bucket; without modification, the drop resistance in low-temperature environments is significantly reduced.

[0070] When activated sepiolite fiber and activated modified diatomaceous earth are compounded in a specific ratio, they can form a complementary support structure and enhance the material's impact resistance; when using only sepiolite fiber, the low-temperature drop performance will be significantly affected.

[0071] An appropriate amount of ethylene-octene copolymer can effectively improve the toughness of the material and reduce the risk of breakage upon drop. Insufficient amount will result in a significant decrease in extrusion resistance.

[0072] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a toughened and impact-resistant plastic bucket, characterized in that, Includes the following steps: S1: Weigh 85-90 parts by weight of polyisobutylene, 6-9 parts by weight of maleic anhydride, 0.8-1.5 parts by weight of initiator and 0.2-0.4 parts by weight of antioxidant; S2: Premix polyisobutylene with maleic anhydride, add initiator and antioxidant, continue stirring to obtain a mixture, feed the mixture into a twin-screw extruder, extrude, cool and pelletize to obtain modified polyisobutylene granules; S3: Weigh 80-90 parts by weight of sepiolite fiber, heat to 108-118℃ and keep warm; then heat to 124-131℃, keep warm, cool and add 3-6 parts by weight of silane coupling agent and 2-4 parts by weight of polyethylene glycol, stir, vacuum dry to obtain activated sepiolite fiber. S4: Weigh 10-20 parts of diatomaceous earth by weight, completely immerse the diatomaceous earth in phosphoric acid solution and stir, wash until neutral, filter and dry to obtain activated modified diatomaceous earth; S5: The filler is obtained by mixing activated sepiolite fiber and activated modified diatomaceous earth at a mass ratio of 4-6:1; S6: By weight, weigh 85-95 parts high-density polyethylene, 12-18 parts modified polyisobutylene granules, 18-22 parts filler, 6-10 parts ethylene-octene copolymer, 0.4-0.8 parts crosslinking agent and 0.6-1.2 parts pigment; S7: First, add high-density polyethylene, modified polyisobutylene particles, and ethylene-octene copolymer to a high-speed mixer in sequence and mix. Then add filler, crosslinking agent, and pigment and continue mixing. The mixed material is filtered to obtain a premixed material. S8: The premixed material is fed into the extruder and extruded and water-cooled into pellets to obtain composite pellets; S9: The composite granules are added to the injection molding machine barrel. After mold closing, injection molding, pressure holding, and cooling, the mold is opened to obtain a plastic bucket blank. The bucket blank is then processed by a deburring machine and surface sterilization to obtain a toughened and impact-resistant plastic bucket.

2. The method for preparing the toughened and impact-resistant plastic bucket according to claim 1, characterized in that, In S1, the initiator is diluted with anhydrous ethanol, and the mass ratio of the initiator to anhydrous ethanol is 1:2-2.

8.

3. The method for preparing the toughened and impact-resistant plastic bucket according to claim 1, characterized in that, S2 specifically involves adding polyisobutylene and maleic anhydride to a high-speed mixer and premixing at 600-800 r / min and 50-60℃ for 8-12 minutes. Antioxidants and diluted initiators are then added, and stirring continues for 3-5 minutes to obtain a mixture. This mixture is then fed into a twin-screw extruder, where it is conveyed at 25-30 r / min in the feeding section at 130-140℃, melted at 35-40 r / min in the plasticizing section at 150-170℃, reacted at 40-45 r / min in the reaction section at 175-185℃ for 6-8 minutes, and extruded through a die at 12-15 MPa in the die head section at 165-175℃. The extruded material is then transferred to a cooling water bath at 20-30℃ for 15-20 seconds and pulled to a pelletizer at 3-5 m / min by a traction machine to be cut into granules with a diameter of 2-3 mm, yielding modified polyisobutylene granules.

4. The method for preparing the toughened and impact-resistant plastic bucket according to claim 1, characterized in that, S3 is specifically as follows: Weigh 80-90 parts by weight of sepiolite fiber, raise the temperature to 108-118℃ at 3-5℃ / min, and keep it at that temperature for 1-1.5h; then raise the temperature to 124-131℃ at 1-3℃ / min, keep it at that temperature for 1-2h, and then let it cool naturally to room temperature. Transfer it to a high-speed mixer, add 3-6 parts by weight of silane coupling agent and 2-4 parts by weight of polyethylene glycol, stir at 1200-1500r / min and 70-80℃ for 1.5-2h, transfer it to a vacuum drying oven, and dry it at 80-90℃ and a vacuum degree of -0.08 to -0.06MPa for 2-3h to obtain activated sepiolite fiber.

5. The method for preparing the toughened and impact-resistant plastic bucket according to claim 1, characterized in that, S4 is specifically as follows: Weigh 10-20 parts of diatomaceous earth by weight, completely immerse the diatomaceous earth in a 5-8 wt% phosphoric acid solution, stir for 2-3 hours at a temperature of 60-70℃ and a speed of 200-300 r / min, wash with deionized water until neutral, filter through a 300-400 mesh sieve, and place in a forced-air drying oven to dry at 100-110℃ for 4-5 hours to obtain activated modified diatomaceous earth.

6. The method for preparing the toughened and impact-resistant plastic bucket according to claim 1, characterized in that, S5 specifically involves mixing activated sepiolite fiber and activated modified diatomaceous earth at a mass ratio of 4-6:1, adding the mixture to a high-speed mixer, and stirring at 800-1000 r / min and 50-60℃ for 30-40 min to obtain the filler.

7. The method for preparing the toughened and impact-resistant plastic bucket according to claim 1, characterized in that, S7 specifically involves: first, adding high-density polyethylene, modified polyisobutylene particles, and ethylene-octene copolymer sequentially to a high-speed mixer and mixing for 15-20 minutes at 70-80℃ and 700-900 r / min; then adding fillers, crosslinking agents, and pigments, cooling the mixture to 50-60℃ at 2-5℃ / min, and continuing to mix for 10-15 minutes; finally, filtering the mixed material through a 40-60 mesh sieve and transferring it to a storage tank to obtain the premixed material.

8. The method for preparing a toughened and impact-resistant plastic bucket according to claim 1, characterized in that, S8 specifically involves feeding premixed materials into an extruder, passing through a feeding section at 160-170℃, a plasticizing section at 180-190℃, a homogenizing section at 195-205℃, a pressure of 18-22MPa, and a die head section at 185-195℃, extruding through a die head at a speed of 400-600mm / min, and then water-cooling at 10-15℃ and pelletizing to obtain composite granules.

9. A toughened and impact-resistant plastic bucket prepared by the preparation method according to any one of claims 1-8.