Search

CN-121975157-A - Carbon fiber and potassium titanate whisker synergistically reinforced wear-resistant thermotropic liquid crystal polymer composite material and preparation method thereof

CN121975157ACN 121975157 ACN121975157 ACN 121975157ACN-121975157-A

Abstract

A carbon fiber and potassium titanate whisker synergistically enhanced wear-resistant thermotropic liquid crystal polymer composite and a preparation method thereof belong to the technical field of material preparation. The composite material is formed by compounding a lubricant, carbon fiber CF, potassium titanate whisker PTW and thermotropic liquid crystal polymer TLCP, wherein the total addition amount of the CF and the PTW is 25wt% of the TLCP, and the lubricant is PTFE and graphite. The preparation method comprises the steps of 1) preparing a thermotropic liquid crystal polymer by a one-pot method, 2) carrying out surface modification on potassium titanate whiskers by using a silane coupling agent, and 3) dispersing carbon fibers, the potassium titanate whiskers/modified potassium titanate whiskers and a lubricant in the thermotropic liquid crystal polymer to form a uniform carbon fiber/potassium titanate whisker/thermotropic liquid crystal polymer dispersion system. The invention can obviously improve the dispersibility and compatibility of the potassium titanate whisker in the matrix, enhance the mechanical property and wear resistance of the thermotropic liquid crystal polymer, has simple preparation process, low production cost and mild reaction condition, can realize mass production, and can meet the special requirements of various fields such as aerospace, civil industry and the like on resin materials.

Inventors

  • HAN LI
  • Zhi Zixuan
  • JIA SHIHAO
  • PAN YUXI

Assignees

  • 大连理工大学

Dates

Publication Date
20260505
Application Date
20260312

Claims (10)

  1. 1. A preparation method of a carbon fiber and potassium titanate whisker synergistically reinforced wear-resistant thermotropic liquid crystal polymer composite material is characterized in that p-hydroxybenzoic acid HBA and 2-hydroxy-6-naphthoic acid HNA are taken as monomers, TLCP resin is obtained through polycondensation reaction polymerization by a one-pot method, and the TLCP resin is compounded with a lubricant, carbon fiber CF and potassium titanate whisker PTW, and the preparation method comprises the following steps: firstly, preparing TLCP resin by adopting a one-pot melt polycondensation method; Secondly, carrying out surface modification on the PTW by using a silane coupling agent; adding the dried PTW into the modified liquid, stirring under the condition of constant-temperature water bath, and combining the silane coupling agent with hydroxyl on the surface of the PTW through hydrogen bond to realize the grafting modification of the surface of the PTW, and carrying out post-treatment to obtain mPTW with the surface modified; thirdly, mPTW, CF and a lubricant obtained in the second step are taken as fillers and added into the TLCP resin prepared in the first step, and after high-speed stirring, the fillers are uniformly dispersed in the TLCP resin to form a uniform CF/PTW/TLCP dispersion system; and fourthly, processing the CF/PTW/TLCP dispersion system obtained in the third step to obtain the CF/PTW/TLCP composite material.
  2. 2. The method for preparing the carbon fiber and potassium titanate whisker synergistically enhanced abrasion-resistant thermotropic liquid crystal polymer composite material according to claim 1, wherein the first step is specifically as follows; Step 1.1, under the nitrogen atmosphere, adding HBA and HNA into a reaction kettle in proportion, adding acetic anhydride as an acetylation reagent, stirring at 120-160 ℃ and preserving heat for 1-3 hours, and completing the acetylation treatment of the monomer; step 1.2, raising the reaction temperature to 230-260 ℃, staying for 30-60 min, and then raising the reaction temperature to 310-350 ℃, stopping introducing nitrogen after the reaction temperature reaches a set temperature, starting a vacuum system, and maintaining the vacuum state for 30-60 min; And 1.3, cooling to room temperature after the reaction is finished, taking out a TLCP crude product, crushing the TLCP crude product into powder, and placing the TLCP crude product in a vacuum environment at 260 ℃ for 24h for solid-phase polycondensation to obtain the TLCP resin with self-reinforcing property.
  3. 3. The method for preparing the carbon fiber and potassium titanate whisker synergistically enhanced abrasion-resistant thermotropic liquid crystal polymer composite according to claim 2, wherein in the step 1.1, the molar ratio of HBA to HNA is 7:3.
  4. 4. The method for preparing the carbon fiber and potassium titanate whisker synergistically enhanced wear-resistant thermotropic liquid crystal polymer composite material, according to claim 1, is characterized in that in the second step, the stirring temperature under the condition of constant-temperature water bath is 60-90 ℃, and the stirring time is 1-3 h.
  5. 5. The method for preparing a carbon fiber and potassium titanate whisker synergistically enhanced abrasion-resistant thermotropic liquid crystal polymer composite according to claim 1, wherein in the second step: The drying treatment temperature of the PTW is 80-100 ℃ and the drying treatment time is 2-5 hours; the post-treatment is that the modified PTW is collected through filtration and recorded as mPTW, and is repeatedly washed by ethanol and then is subjected to drying treatment to obtain mPTW with the surface modified, wherein the drying treatment temperature is 80-100 ℃ and the drying treatment time is 12-24 hours.
  6. 6. The method for preparing a carbon fiber and potassium titanate whisker synergistically enhanced abrasion-resistant thermotropic liquid crystal polymer composite according to claim 1, wherein in the second step, the mass ratio of ethanol to distilled water in the ethanol-water solution is 10:1.
  7. 7. The preparation method of the wear-resistant thermotropic liquid crystal polymer composite material with the synergistic reinforcement of carbon fibers and potassium titanate whiskers, which is disclosed in claim 1, is characterized in that in the second step, the addition amount of a silane coupling agent is 5-10wt.% of PTW, and the silane coupling agent is selected from dimethylvinylethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyl trimethoxysilane or gamma-methacryloxypropyl trimethoxysilane.
  8. 8. The method for preparing the carbon fiber and potassium titanate whisker synergistically enhanced wear-resistant thermotropic liquid crystal polymer composite material according to claim 1, wherein the fourth step is specifically that the dispersion system is processed by twin-screw extrusion granulation and injection molding machine molding to obtain the CF/PTW/TLCP composite material.
  9. 9. The wear-resistant thermotropic liquid crystal polymer composite material with the synergistic reinforcement of carbon fibers and potassium titanate whiskers is characterized in that the wear-resistant thermotropic liquid crystal polymer composite material is prepared by adopting the preparation method of any one of claims 1-8, and is formed by compounding a lubricant, carbon fibers CF, potassium titanate whiskers PTW and thermotropic liquid crystal polymer TLCP.
  10. 10. The abrasion-resistant thermotropic liquid crystal polymer composite reinforced by the cooperation of carbon fiber and potassium titanate whisker according to claim 9, wherein the abrasion-resistant thermotropic liquid crystal polymer composite comprises: The CF is chopped carbon fiber T300, and the PTW diameter is 0.1-2 mu m; the total addition amount of the CF and the PTW is 25wt% of the TLCP composite material, wherein the mass ratio of the CF to the PTW is 20:5-5:20; The lubricant is PTFE and graphite, the addition amount of the PTFE is 4wt% of the addition amount of the TLCP, and the addition amount of the graphite is 1wt% of the addition amount of the TLCP.

Description

Carbon fiber and potassium titanate whisker synergistically reinforced wear-resistant thermotropic liquid crystal polymer composite material and preparation method thereof Technical Field The invention belongs to the technical field of polymer composite materials, and relates to a carbon fiber and potassium titanate whisker synergistically reinforced wear-resistant thermotropic liquid crystal polymer composite material and a preparation method thereof, which are suitable for manufacturing high-precision wear-resistant parts such as equipment cameras and bearings. Background With the continuous high-speed development of the fields of aerospace, electronic information, high-end equipment manufacturing and the like, high-precision equipment is accelerated to be iteratively upgraded in the core direction of light weight, high rotating speed and long service life. From miniature camera modules in the consumer electronics field, high-speed precision bearings in industrial automation, to miniature transmission gears in precision transmission systems, and core components of detection equipment in semiconductor manufacturing, the operation conditions of these equipment are increasingly severe—not only high-frequency reciprocating motion or ultra-high-speed rotation is realized in a very small installation space, but also continuous friction, local instantaneous high temperature and mechanical impact under complex load caused by long-time continuous operation are borne. The upgrading trend puts forward unprecedented stringent requirements on the performance of the core wear-resistant component of the equipment, namely, the equipment is required to have high hardness and low wear rate firstly so as to resist surface loss caused by high-frequency friction, avoid tiny particles generated by component wear from polluting the internal environment of the equipment, ensure that the long-term operation precision of the equipment is not attenuated, secondly, the equipment is required to have excellent dimensional stability, the deformation quantity is controlled to be in a micron level or even a nanometer level under the complex working conditions such as temperature fluctuation, load change and the like, ensure that the fit clearance among the components always accords with the design standard, the positioning precision and the transmission efficiency of the equipment are not influenced, and meanwhile, the equipment is required to have reliable high temperature resistance, can keep stable performance under the local friction heat generation or extreme environment temperature, does not soften, deform or attenuate performance, and further, good mechanical bearing capacity is required to have enough strength and toughness under the complex load, avoid the problems of fracture, fatigue failure and the like, and finally, the high-precision equipment is supported to realize longer service life, higher operation reliability and better comprehensive performance. At present, although the polymer materials applied to the wear-resistant parts of high-precision equipment form a multi-class layout, the polymer materials are limited by the severe working condition requirements of the short plates with the self performance and the high-precision equipment, and the full-performance adaptation is difficult to realize, and the specific short plates and the application are limited as follows: (1) Polycarbonate (PC) is a common material with low load and non-core part by virtue of good impact toughness and light transmittance, and a part of the polycarbonate is subjected to wear-resistant modification, so that the polycarbonate can be used for equipment shell decoration, light sliding contact surfaces and other scenes. But the intrinsic performance of the short plate is remarkable in that the Shore hardness is only about 85HD, the surface wear resistance is poor, scratches are easy to generate under high-frequency contact or slight friction, the thermal deformation temperature is about 130 ℃, and softening, deformation and even melting phenomena are easy to generate in a local high-temperature environment caused by high-speed friction. These drawbacks make it impossible to assume the function of the core wear part and only to use it as auxiliary wear-resistant material. (2) Polyimide (PI) is a high-performance representative in the field of high temperature resistance and wear resistance, has excellent mechanical strength and chemical corrosion resistance at the long-term use temperature of more than 260 ℃, and is widely applied to high-precision equipment insensitive to cost, such as aerospace, high-end military industry and the like. However, the industrial application bottleneck of the method is outstanding, the melt viscosity is extremely high, precise parts with complex shapes cannot be prepared by conventional mass production processes such as injection molding, extrusion and the like, special processes such as sintering, machining and th