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CN-121975203-A - Film material and preparation method and application thereof

CN121975203ACN 121975203 ACN121975203 ACN 121975203ACN-121975203-A

Abstract

The invention relates to the technical field of film materials, in particular to a film material and a preparation method and application thereof. The modified polypropylene composite material comprises, by weight, 30-80 parts of modified polypropylene, 10-16 parts of nano microspheres, 20-30 parts of polyvinylidene fluoride, 3-5 parts of modified lignin, 0.5-2 parts of benzophenone, 3-8 parts of a cross-linking agent, 5-12 parts of a compatilizer, 1-2 parts of a dispersing agent and 0.5-2.5 parts of an antioxidant. The prepared film material is modified by glass fiber reinforcement, mineral filling or blending, so that the rigidity, the impact resistance and the dimensional stability are obviously improved.

Inventors

  • GAO YIJUN
  • ZHANG HUIMIN
  • ZHANG XIAOLEI

Assignees

  • 德州学院

Dates

Publication Date
20260505
Application Date
20260320

Claims (10)

  1. 1. The film material is characterized by comprising, by weight, 30-80 parts of modified polypropylene, 10-16 parts of nano microspheres, 20-30 parts of polyvinylidene fluoride, 3-5 parts of modified lignin, 0.5-2 parts of benzophenone, 3-8 parts of a cross-linking agent, 5-12 parts of a compatilizer, 1-2 parts of a dispersing agent and 0.5-2.5 parts of an antioxidant; the modified polypropylene is prepared from styrene-butadiene rubber and calcium carbonate modified polypropylene; The modified lignin is prepared by modifying lignin with cellulose acetate.
  2. 2. The film material according to claim 1, wherein the modified polypropylene comprises polypropylene, styrene-butadiene rubber and calcium carbonate, and the mass ratio of the polypropylene to the styrene-butadiene rubber to the calcium carbonate is 3-5:11-16:1-3.
  3. 3. The thin film material according to claim 1, wherein the nano-microsphere is prepared by adding tetrabutyl titanate into nano-TiO 2 and nano-SiO 2 , and the adding amount of the tetrabutyl titanate is 10% -30%.
  4. 4. The thin film material according to claim 3, wherein the mass ratio of the nano-TiO 2 to the nano-SiO 2 is 3-5:1-2.
  5. 5. The film material of claim 1, wherein the mass ratio of cellulose acetate to lignin is 1-2:5-8.
  6. 6. The film material of claim 1, wherein the cross-linking agent is selected from at least one of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate.
  7. 7. The film material of claim 1, wherein the compatibilizer is selected from at least one of maleic anhydride grafted polypropylene, acrylic acid grafted polypropylene, glycidyl ester grafted polypropylene, oxazoline grafted polypropylene.
  8. 8. The film material of claim 1, wherein the dispersant is at least one selected from the group consisting of polyethylene wax, oxidized polyethylene wax, polypropylene wax, and ethylene-vinyl acetate copolymer wax, and wherein the antioxidant is at least one selected from the group consisting of antioxidant 1010, antioxidant 168, antioxidant 626, antioxidant 1098, antioxidant 3114, and antioxidant 1790.
  9. 9. The method for preparing a thin film material according to any one of claims 1 to 8, comprising the steps of: (2) Respectively weighing modified polypropylene, nano microspheres, polyvinylidene fluoride, modified lignin, diphenyl ketone, a cross-linking agent, a compatilizer, a dispersing agent and an antioxidant according to a formula, then adding the mixture into a mixer, stirring for 0.5-2 h, then adding the mixture into a double-screw extruder for granulating, wherein the extrusion temperature is 220-280 ℃, and drying after granulating is finished to obtain modified polypropylene master batches; (3) And (3) adding the modified polypropylene master batch obtained in the step (1) into a single screw extruder for extruding sheets, and obtaining the film material after biaxial stretching and ultraviolet irradiation.
  10. 10. The use of a thin film material according to any one of claims 1 to 8 in a capacitor.

Description

Film material and preparation method and application thereof Technical Field The invention relates to the technical field of film materials, in particular to a film material and a preparation method and application thereof. Background With the rapid development of the microelectronics industry, the need for miniaturized capacitors is becoming more and more urgent. In order to obtain a capacitor with small volume, light weight and high energy storage density, it is critical to develop a dielectric film with small density, high dielectric constant and low dielectric loss as a dielectric material. Polypropylene is the most widely used dielectric material in power capacitors, and has the advantages of high breakdown field strength, low dielectric loss, wide sources and the like, but has low dielectric constant, so that the energy storage of polypropylene is limited, and the further and wider application of polypropylene is further limited. In the prior art, one main research direction for improving the dielectric constant of the dielectric material is to add inorganic nano particles, but the easy agglomeration property and poor compatibility of the inorganic nano particles with a polymer matrix make the processability of an inorganic nano particle/polypropylene system extremely poor, and engineering application is difficult to obtain in practice. The inorganic filler has poor compatibility with the organic matrix, is easy to cause agglomeration and mechanical property reduction, and the excessive filling can cause the film to become brittle and reduce the toughness of the film material. Disclosure of Invention The invention provides a film material, a preparation method and application thereof, and the prepared film material is modified by glass fiber reinforcement, mineral filling or blending, so that the rigidity, the impact resistance and the dimensional stability are obviously improved. According to the first aspect, the film material comprises, by weight, 30-80 parts of modified polypropylene, 10-16 parts of nano microspheres, 20-30 parts of polyvinylidene fluoride, 3-5 parts of modified lignin, 0.5-2 parts of benzophenone, 3-8 parts of a cross-linking agent, 5-12 parts of a compatilizer, 1-2 parts of a dispersing agent and 0.5-2.5 parts of an antioxidant. Preferably, the modified polypropylene comprises polypropylene, styrene-butadiene rubber and calcium carbonate, wherein the mass ratio of the polypropylene to the styrene-butadiene rubber to the calcium carbonate is 3-5:11-16:1-3. Preferably, the nano microsphere is prepared by adding tetrabutyl titanate into nano TiO 2 and nano SiO 2, wherein the addition amount of the tetrabutyl titanate is 10% -30%. Preferably, the mass ratio of the nano TiO 2 to the nano SiO 2 is 3-5:1-2. Preferably, the modified lignin is prepared from cellulose acetate modified lignin, and the mass ratio of the cellulose acetate to the lignin is 1-2:5-8. Preferably, the cross-linking agent is at least one selected from trimethylolpropane triacrylate, trimethylolpropane trimethacrylate and pentaerythritol triacrylate. Preferably, the compatilizer is at least one selected from maleic anhydride grafted polypropylene, acrylic acid grafted polypropylene, glycidyl ester grafted polypropylene and oxazoline grafted polypropylene. Preferably, the dispersing agent is at least one selected from polyethylene wax, oxidized polyethylene wax, polypropylene wax and ethylene-vinyl acetate copolymer wax, and the antioxidant is at least one selected from antioxidant 1010, antioxidant 168, antioxidant 626, antioxidant 1098, antioxidant 3114 and antioxidant 1790. In a second aspect, the present invention provides a method for preparing a film material, comprising the steps of: (4) Respectively weighing modified polypropylene, nano microspheres, polyvinylidene fluoride, modified lignin, diphenyl ketone, a cross-linking agent, a compatilizer, a dispersing agent and an antioxidant according to a formula, then adding the mixture into a mixer, stirring for 0.5-2 h, then adding the mixture into a double-screw extruder for granulating, wherein the extrusion temperature is 220-280 ℃, and drying after granulating is finished to obtain modified polypropylene master batches; (5) And (3) adding the modified polypropylene master batch obtained in the step (1) into a single screw extruder for extruding sheets, and obtaining the film material after biaxial stretching and ultraviolet irradiation. In a third aspect, the present invention provides a use of a thin film material in a capacitor. In summary, the invention has the following beneficial effects: 6. The modified polypropylene comprises polypropylene, styrene-butadiene rubber and calcium carbonate, and has excellent stability to acid, alkali, salt and the like, and the polypropylene is resistant to chemical corrosion. The butadiene styrene rubber has the toughening effect, the impact resistance and the flexibility can be obviously improved, the low-temperature b