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CN-122011635-A - Low-friction processable fluorine-containing composite material and preparation method and application thereof

CN122011635ACN 122011635 ACN122011635 ACN 122011635ACN-122011635-A

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a low-friction processable fluorine-containing composite material, and a preparation method and application thereof. The low-friction processable fluorine-containing composite material comprises, by mass, 80-95% of fusible polytetrafluoroethylene and 5-20% of filler, wherein the filler comprises one or more of graphite, carbon fiber and Polytetrafluoroethylene (PTFE). The low-friction processable fluorine-containing composite material provided by the invention has a low friction coefficient and high compression strength.

Inventors

  • JI HAIPENG
  • ZHAI HONGBIN
  • DU YIMAN
  • SHANG YINGSHUANG
  • ZHANG HAIBO
  • JIANG BO
  • ZHU XUANBO
  • MA CONG
  • LI YUEQIAO

Assignees

  • 内蒙合成化工研究所
  • 吉林大学

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. The low-friction processable fluorine-containing composite material is characterized by comprising the following preparation raw materials in percentage by mass: 80-95% of fusible polytetrafluoroethylene and 5-20% of filler; The filler comprises any one or more of graphite, carbon fiber and polytetrafluoroethylene.
  2. 2. The low-friction processable fluorine-containing composite material according to claim 1, wherein the fusible polytetrafluoroethylene is tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, the melt index of the fusible polytetrafluoroethylene is 10-60 g/10min, and the particle size of the fusible polytetrafluoroethylene is 38-75 μm.
  3. 3. The low friction processable fluorine containing composite of claim 1, wherein the graphite is 1-5 μm in size.
  4. 4. The low friction processable fluorochemical composite according to claim 1 wherein said carbon fibers have a length of 0.3 to 0.6mm and a diameter of 7 to 10 μm.
  5. 5. The low friction processable fluorochemical composite according to claim 1 wherein said polytetrafluoroethylene has a particle size of 25 to 75 μm.
  6. 6. The method for preparing the low-friction processable fluorine-containing composite material according to any one of claims 1 to 5, which is characterized by comprising the following steps: Mixing fusible polytetrafluoroethylene and filler, and sequentially carrying out melt extrusion and granulation to obtain granules; and (3) carrying out injection molding compression on the granules in a mold to obtain the low-friction processable fluorine-containing composite material.
  7. 7. The method according to claim 6, wherein the temperature of the melt extrusion is 360 to 380 ℃.
  8. 8. The method according to claim 6 or 7, wherein the screw speed during the melt extrusion is set to 35 to 45rpm and the torque is set to 15 to 25 n.m.
  9. 9. The method according to claim 6, wherein the injection compression temperature is 360-375 ℃, the time is 15-25 s, and the pressure is 0.5-0.7 mpa.
  10. 10. Use of the low friction processable fluorine-containing composite material according to any one of claims 1 to 5 or the low friction processable fluorine-containing composite material prepared by the preparation method according to any one of claims 6 to 9 in chemical, electronic and electrical, aerospace or automotive manufacturing.

Description

Low-friction processable fluorine-containing composite material and preparation method and application thereof Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a low-friction processable fluorine-containing composite material, and a preparation method and application thereof. Background Fluoropolymers such as Polytetrafluoroethylene (PTFE), perfluoroethylene-propylene copolymers (FEP), polyvinylidene fluoride (PVDF), and the like are widely used in the fields and industries of automobiles, electronics, machinery manufacturing, medicine, aerospace, and the like as "plastic king" in the industry due to their excellent chemical stability, low coefficient of friction, low dielectric constant, and other physicochemical properties. Polytetrafluoroethylene is a high molecular compound containing fluorine atoms in a molecular main chain, and has excellent high-low temperature resistance and chemical stability due to high dissociation energy of C-F bonds in molecules, high electronegativity and shielding effect of fluorine atoms, and has good dielectric property, low friction property, non-adhesion, incombustibility and lubricity, so that the polytetrafluoroethylene is a high molecular material with very excellent performance. However, polytetrafluoroethylene is difficult to process by extrusion, injection molding, or the like due to the high melt viscosity of PTFE. In addition, the higher melt viscosity causes insufficient melt flow of the resin to fully infiltrate the filler, so that tight interface bonding is difficult to establish with the filler on a physical level, and the application of the filler is influenced. Fusible fluoropolymers such as fusible Polytetrafluoroethylene (PFA) and Fluorinated Ethylene Propylene (FEP) are widely used in extremely severe fields such as semiconductor manufacturing, chemical corrosion protection, high frequency communications, high-end cables, etc., due to their excellent chemical inertness, extremely low surface energy, excellent high and low temperature resistance, excellent dielectric properties and weather resistance. With wider and wider application of fluoropolymers, the requirements on materials are also higher and higher, and how to develop high-filling reinforced fluoropolymer composite materials is a technical problem to be solved at present. Among them, PFA resin is relatively new fluoroplastic, PFA is similar to PTFE and FEP, chemical resistance of PFA is equivalent to PTFE, and melting point of PFA is about 300 ℃. Compared with PTFE which is difficult to melt, the PFA has the advantages of melt processability, high strength, high temperature stability, chemical stability, electrical insulation and the like compared with other plastics, widens the application range, and has the characteristics of low friction coefficient, non-tackiness, corrosion resistance and the like. PFA, however, also has some inherent drawbacks including poor wear resistance, poor load bearing capacity, and susceptibility to cracking when subjected to high stresses. Therefore, it is important to develop a composite material with high compressive strength while maintaining the lower friction coefficient of PFA, so that the composite material can better meet the use requirements in the fields of chemical industry, electronics and electricity, aerospace, automobile manufacturing and the like. Disclosure of Invention In view of the above, the present invention aims to provide a low-friction processable fluorine-containing composite material, a preparation method and an application thereof. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a low-friction processable fluorine-containing composite material, which comprises the following preparation raw materials in percentage by mass: 80-95% of fusible polytetrafluoroethylene and 5-20% of filler; The filler comprises any one or more of graphite, carbon fiber and polytetrafluoroethylene. Preferably, the fusible polytetrafluoroethylene is tetrafluoroethylene-perfluoro alkoxy vinyl ether copolymer, the melt index of the fusible polytetrafluoroethylene is 10-60 g/10min, and the particle size of the fusible polytetrafluoroethylene is 38-75 mu m. Preferably, the graphite has a size of 1-5 μm. Preferably, the carbon fiber has a length of 0.3-0.6 mm and a diameter of 7-10 μm. Preferably, the particle size of the polytetrafluoroethylene is 25-75 μm. The invention also provides a preparation method of the low-friction processable fluorine-containing composite material, which comprises the following steps: Mixing fusible polytetrafluoroethylene and filler, and sequentially carrying out melt extrusion and granulation to obtain granules; and (3) carrying out injection molding compression on the granules in a mold to obtain the low-friction processable fluorine-containing composite material. Preferably, the temperature of