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CN-122008660-A - Polypropylene hollow plate material and preparation method thereof

CN122008660ACN 122008660 ACN122008660 ACN 122008660ACN-122008660-A

Abstract

The invention relates to the technical field of polypropylene hollow plates, and particularly discloses a polypropylene hollow plate material and a preparation method thereof. The polypropylene hollow plate material is prepared from the following components, by weight, 30-40 parts of block copolymerized polypropylene, 15-25 parts of homo-polymerized polypropylene, 0-5 parts of high-density polyethylene, 30-50 parts of heavy calcium carbonate, 1-10 parts of anisotropic filler, 0.5-1 part of surface modifier, 0.05-2 parts of compatilizer, 1-2 parts of lubricant, 0.1-0.2 part of antioxidant and 0.1-0.2 part of light stabilizer by a micro-nano lamination coextrusion process. The invention is based on the micro-nano lamination coextrusion process, realizes further dispersion of powder in the PP resin and orientation of anisotropic filler by means of a multi-stage stretching field and strong shearing in the micro-nano lamination coextrusion process, and improves the strength and toughness of the composite material.

Inventors

  • ZHANG JUNCHI
  • DUAN CHENGYUAN
  • WU HONG
  • DENG JUN
  • ZHU JIAMING
  • LU JUN
  • ZHANG YIHAO
  • CHENG PENG
  • Zou Longwu
  • Xie Yuanyang

Assignees

  • 中安联合煤化有限责任公司

Dates

Publication Date
20260512
Application Date
20260305

Claims (10)

  1. 1. The polypropylene hollow plate material is characterized by being prepared from the following components, by weight, 30-40 parts of block copolymerized polypropylene, 15-25 parts of homo-polymerized polypropylene, 0-5 parts of high-density polyethylene, 30-50 parts of heavy calcium carbonate, 1-10 parts of anisotropic filler, 0.5-1 part of surface modifier, 0.05-2 parts of compatilizer, 1-2 parts of lubricant, 0.1-0.2 part of antioxidant and 0.1-0.2 part of light stabilizer through a micro-nano lamination coextrusion process.
  2. 2. The polypropylene hollow panel material according to claim 1, wherein the melt flow rate of the homo-polypropylene under 230 ℃, 2.16kg, is 2.0-5.0g/10min, and/or the melt flow rate of the block-copolymerized polypropylene under 230 ℃, 2.16kg, is 2.0-5.0g/10min, and/or the melt flow rate of the high-density polyethylene under 230 ℃, 2.16kg, is 8.0-15.0g/10min.
  3. 3. The polypropylene hollow panel material according to claim 1, wherein the ground calcium carbonate has a mesh number of 800-1500 mesh.
  4. 4. The polypropylene hollow board material according to claim 1, wherein the anisotropic filler is a sheet material or a needle-like material, and the anisotropic filler is one of talc powder, calcium carbonate whisker, and calcium sulfate whisker.
  5. 5. The polypropylene hollow board material according to claim 1, wherein the compatibilizer is one of maleic anhydride grafted polypropylene or maleic anhydride grafted POE, and/or the lubricant is one of white oil, pyrolysis oil, polyethylene wax or polypropylene wax, and/or the surface modifier comprises at least one of stearic acid, stearate, acrylate copolymer ACR, ethylene bis stearamide, silane coupling agent, titanate coupling agent and aluminate coupling agent, and/or the antioxidant is at least one of hindered phenol antioxidant, phosphite antioxidant, thioester auxiliary antioxidant, and/or the light stabilizer is at least one of hindered amine light stabilizer, benzotriazole ultraviolet absorber, benzophenone ultraviolet absorber, triazine ultraviolet absorber.
  6. 6. A method for producing a polypropylene hollow panel material according to any one of claims 1 to 5, comprising the steps of: S1, drying heavy calcium carbonate, mixing and stirring the dried heavy calcium carbonate with a surface modifier according to a proportion, and activating the mixture to obtain activated heavy calcium carbonate; S2, drying the block copolymerized polypropylene, the homopolymerized polypropylene, the high-density polyethylene and the anisotropic filler, and mixing the dried block copolymerized polypropylene, the homopolymerized polypropylene, the high-density polyethylene and the anisotropic filler with a compatilizer, a lubricant, an antioxidant and the activated heavy calcium carbonate according to a proportion in a mixer to obtain a mixture; s3, the mixture is put into micro-nano lamination coextrusion equipment for melt extrusion granulation, and the polypropylene hollow plate material is obtained.
  7. 7. The method for producing a polypropylene hollow plate material according to claim 6, wherein in the step S1, the drying is performed in an oven at 100 to 120 ℃ for 2 to 2.5 hours, and the mixing and stirring are performed at 200 to 300rpm for 30 seconds and 1000 to 1500rpm for 5 minutes; and/or in the step S2, the block copolymerized polypropylene, the homopolymerized polypropylene and the high-density polyethylene are dried in an oven at 80-90 ℃ for 1-2h, and the anisotropic filler is dried in an oven at 100-120 ℃ for 2-2.5h; And/or in the step S3, the micro-nano laminated coextrusion equipment is formed by serially connecting micro-nano laminated modules of a double-screw extruder, wherein the number of the micro-nano laminated modules is 1-7, and the temperature of each area of the double-screw extruder is 180-220 ℃.
  8. 8. A method for producing a polypropylene hollow panel material according to any one of claims 1 to 5, comprising the steps of: S1, drying heavy calcium carbonate, mixing and stirring the dried heavy calcium carbonate with a surface modifier according to a proportion, and activating the mixture to obtain activated heavy calcium carbonate; S2, drying block copolymerized polypropylene, homopolypropylene and high-density polyethylene, then putting the block copolymerized polypropylene, the homopolypropylene and the high-density polyethylene into a mixer, and then putting a lubricant, an antioxidant and the activated heavy calcium carbonate into the mixer to obtain a master batch A; S3, drying the homo-polypropylene, the compatilizer and the anisotropic filler, then putting the dried homo-polypropylene, the compatilizer and the anisotropic filler into a mixer, and then putting the lubricant and the antioxidant into the mixer to obtain a master batch B; S4, putting the master batch A and the master batch B into micro-nano lamination coextrusion equipment for melt extrusion granulation to obtain the polypropylene hollow plate material.
  9. 9. The method for producing a polypropylene hollow plate material according to claim 8, wherein in step S1, the drying is performed in an oven at 100 to 120 ℃ for 2 to 2.5 hours, and the mixing and stirring are performed at 200 to 300rpm for 30 seconds and 1000 to 1500rpm for 5 minutes; And/or, in the step S2, the block copolymerized polypropylene, the homo-polymerized polypropylene and the high-density polyethylene are dried in an oven at 80-90 ℃ for 1-2h; And/or in the step S3, the homo-polypropylene and the compatilizer are dried in an oven at 80-90 ℃ for 1-2h, and the anisotropic filler is dried in an oven at 100-120 ℃ for 2-2.5h.
  10. 10. The method for preparing the polypropylene hollow plate material according to claim 8, wherein in the step S4, the micro-nano lamination coextrusion device is formed by serially connecting micro-nano lamination modules of a double-screw extruder, the number of the micro-nano lamination modules is 1-7, and the temperature of each region of the double-screw extruder is 180-220 ℃.

Description

Polypropylene hollow plate material and preparation method thereof Technical Field The invention relates to the technical field of polypropylene hollow plates, in particular to a polypropylene hollow plate material and a preparation method thereof. Background The buffer shell packaging material is an indispensable component part in the goods turnover process of fresh goods, agricultural and sideline products and the like, and plays roles in protecting the products, reducing the breakage rate and the like. Common packaging cushioning materials are corrugated board, honeycomb board, EPE, EPS, air liner, and the like. Compared with the buffer materials, the polypropylene hollow plate with the sandwich structure has the unique advantages of better mechanical property, convenient molding, light weight, portability, water resistance, moisture resistance, high specific strength, recycling and the like, and has rich application scenes in the fields of ocean transportation, white electricity plastic foam packaging and the like. The PP/CaCO 3 polypropylene hollow plate has remarkable advantages in logistics transportation, and the calcium carbonate is used as an inorganic filler with low price and rich resources, so that the overall cost of the hollow plate raw material can be effectively reduced by improving the filling amount of the calcium carbonate. The high filling amount of the calcium carbonate enhances the rigidity and hardness of the plate and meets the application requirements on high strength and stability. The dimensional stability of the material is improved and shrinkage and warpage of the article are reduced. The calcium carbonate also has certain flame retardant property, and the safety performance of the material is enhanced. In the production process of the polypropylene hollow plate, a certain proportion of homo-polypropylene, block-copolymerized polypropylene, high-filling calcium carbonate master batch, color master batch, defoamer and the like are premixed in a stirrer, and then an extruder is heated to finish, and a screw is started to start feeding. After the material enters the extruder, the extruder uniformly extrudes the mixed melt in the rotary cylinder by adjusting the melt index, the feeding amount, the rotating speed, the temperature and other processing parameters of the extruder, and the mixed melt is extruded, cooled and shaped into a plate blank shape. The polypropylene hollow plate obtained by the method generally has the problems of uneven calcium carbonate dispersion, general surface quality, low-temperature embrittlement of the plate and the like. The conventional regulating method mainly depends on a process master to regulate the polypropylene 'homo/copolymerization' ratio and the dosage of high-filling calcium carbonate master batch to regulate the performance, but the regulating range is limited, and when the low-temperature toughness is improved by improving the copolymerization ratio, the tensile strength, the bending strength, the modulus and the like are also greatly reduced, and the bearing and bending resistance of the hollow plate are obviously deteriorated. When the calcium carbonate content is further increased, the impact resistance and the tensile property are obviously reduced due to limited interaction between dispersion and interfaces, and the calcium carbonate can only be used in the occasions such as a disposable turnover box in a warm environment and the like without recycling conditions. In view of cost, the polypropylene hollow plate is expected to further increase the mineral filling content, so how to realize the rigid-tough synergy of the polypropylene hollow plate under the high calcium carbonate filling proportion has important significance for reducing cost and maintaining performance. Disclosure of Invention Based on the technical scheme, the invention aims to provide a polypropylene hollow plate material and a preparation method thereof, wherein the polypropylene hollow plate material is based on a micro-nano lamination coextrusion process, and further dispersion of powder in PP resin and orientation of anisotropic filler are realized by means of a multi-stage stretching field and strong shearing in the micro-nano lamination coextrusion process, so that the strength and toughness of a composite material are improved. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides a polypropylene hollow plate material which is prepared from the following components, by weight, 30-40 parts of block copolymerized polypropylene, 15-25 parts of homo-polymerized polypropylene, 0-5 parts of high-density polyethylene, 30-50 parts of heavy calcium carbonate, 1-10 parts of anisotropic filler, 0.5-1 part of surface modifier, 0.05-2 parts of compatilizer, 1-2 parts of lubricant, 0.1-0.2 part of antioxidant and 0.1-0.2 part of light stabilizer through a micro-nano lamination coextrusion process. As a fu