Insulating wear-resistant polyether ether ketone composite
By using composite materials of PEEK, PTFE, hexagonal boron nitride, and glass fiber, combined with specific processes, the problems of high friction coefficient and decreased insulation performance of PEEK materials under high temperature and high voltage have been solved, achieving a balance between low friction, wear resistance, and insulation performance, making it suitable for high voltage insulation scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHANGCHUN JIDA ENG RES FOR SUPER ENG PLASTICS LTD CO
- Filing Date
- 2026-05-09
- Publication Date
- 2026-06-05
AI Technical Summary
Existing polyetheretherketone (PEEK) materials suffer from high friction coefficients, decreased mechanical properties, and impaired insulation performance under high temperature and high voltage conditions, making them unsuitable for applications with stringent insulation requirements.
A composite material consisting of PEEK resin, PTFE, hexagonal boron nitride, and glass fiber is prepared by adding fluorinated lubricants and antioxidants through a specific mixing and extrusion process, thereby balancing the coefficient of friction, wear value, mechanical strength, and heat distortion temperature.
It achieves low friction coefficient, improved mechanical and insulation properties at high temperatures, and is suitable for high voltage and high insulation requirements.
Smart Images
Figure CN122146020A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of polyaryletherketone materials, and in particular to an insulating and wear-resistant polyaryletherketone composite material. Background Technology
[0002] Polyetheretherketone (PEEK), a high-performance thermoplastic engineering plastic, is widely used in aerospace, precision instruments, and medical devices due to its excellent mechanical properties, thermal stability, chemical resistance, and inherent wear resistance. Especially in friction-driven components such as bearings and gears, PEEK is considered an ideal alternative to metals. However, pure PEEK resin still has inherent limitations in practical applications: its relatively high coefficient of friction means that under harsh conditions such as high speed, high load, and no lubrication, frictional heat is significant and difficult to dissipate, potentially causing the temperature rise at the contact surface to exceed the material's permissible operating range. This, to some extent, limits its widespread application in sliding components.
[0003] To improve the tribological properties of PEEK, existing technologies mainly employ composite modification techniques. Polytetrafluoroethylene (PTFE), due to its extremely low coefficient of friction and excellent self-lubricating properties, is widely used as a solid lubricant modifier for PEEK. Both PEEK and PTFE have similar melting points and good blending processability. The introduction of PTFE can form a transfer film at the friction interface, effectively reducing the coefficient of friction of the composite material. Meanwhile, fiber reinforcement is an important means to improve the mechanical properties and wear resistance of polymer materials. Numerous studies have disclosed technical solutions for synergistic modification of PEEK with carbon fiber, graphite, molybdenum disulfide, etc., in conjunction with PTFE, significantly improving the wear resistance of the material through melt blending.
[0004] However, most of the aforementioned conventional modified fillers are conductors or semiconductors. Although the PEEK substrate itself has excellent insulation properties, the addition of such fillers significantly reduces the electrical strength of the composite material, making it difficult to apply in scenarios with stringent insulation requirements (such as electronic equipment components, electrical insulation parts, etc.). In such scenarios, it is currently common practice to use pure PEEK resin or simple alloys of it with PTFE.
[0005] In summary, the existing technology still has the following problems that urgently need to be solved: First, the operating temperature of pure PEEK or PEEK / PTFE alloys is limited because their glass transition temperature (Tg) is about 143°C. Above this temperature, the material modulus decreases significantly, which cannot meet the requirements of high-temperature working conditions. Second, although simply adding PTFE can reduce the coefficient of friction, its softness will lead to a decrease in the overall mechanical properties of the composite material, and the wear resistance (wear amount) is not significantly improved compared with pure PEEK. Third, while using traditional fillers such as carbon fiber and graphite can improve wear resistance or mechanical properties, it will damage the insulation properties of the material and make it completely unsuitable for specific fields with high voltage and high insulation requirements. Summary of the Invention
[0006] To address the aforementioned problems and obtain an insulating and wear-resistant polyetheretherketone (PEEK) composite material, this invention achieves a balance in the composite material's friction coefficient, wear value, mechanical strength, and heat distortion temperature through the selection of fillers and additives, and the adjustment of the composite process. A wear-resistant PEEK composite material capable of meeting the stringent insulation requirements of various applications has been designed. The technical solution of this invention is as follows: An insulating and wear-resistant polyetheretherketone (PEEK) composite material comprises the following components: 70-80% PEEK resin powder, 5-10% PTFE powder, 5-10% hexagonal boron nitride, 5-10% glass fiber, 0.1-0.5% fluorinated lubricant, and 0.1-0.2% antioxidant. All components except glass fiber are thoroughly mixed and fed into a granulator through the main feed port. Glass fiber is directly added to the pre-mixed melt through a side feed port. The mixture is then thoroughly mixed, extruded, and pelletized using a twin-screw extruder to obtain the composite material granules.
[0007] Preferably, the fluorinated lubricant is one or both of polyvinylidene fluoride (PVDF) and perfluoroalkyl compounds (PFA).
[0008] Preferably, the antioxidant is one or more of PEPQ (organophosphate antioxidant) or SARAFOS 2628 (bis(dicumylphenyl)pentaerythritol diphosphite).
[0009] Preferably, the above-mentioned hexagonal boron nitride undergoes surface treatment before use. The treatment process is as follows: take 1%-3% of maleic anhydride by mass of hexagonal boron nitride, grind it and mix it thoroughly with hexagonal boron nitride, place it in an oven and let it stand at 195°C for 1-2 hours, then raise the temperature to 220°C and turn on the blower to continue drying for 1 hour. Attached Figure Description
[0010] Figure 1 The graph shows the relationship between the friction coefficient and experimental time for Example 1 and Comparative Example 1. Detailed Implementation
[0011] The present invention will be further described in detail through specific embodiments. Example 1
[0012] Take 70% PEEK resin powder, 9.8% PTFE powder, 10% hexagonal boron nitride, 10% glass fiber, 0.1% fluorinated lubricant, and 0.1% antioxidant. Mix all components except glass fiber thoroughly and uniformly. Add the mixture to the granulator through the main feed port, while the glass fiber is added directly to the pre-mixed melt through the side feed port. Then, thoroughly mix, extrude, and pelletize using a twin-screw extruder to obtain the composite material granules.
[0013] The aforementioned fluorinated lubricant is PVDF.
[0014] The antioxidant mentioned above is PEPQ.
[0015] Before use, hexagonal boron nitride undergoes surface treatment, which is as follows: Take 1% maleic anhydride by mass of hexagonal boron nitride, grind it, mix it thoroughly with hexagonal boron nitride, place it in an oven at 195°C and let it stand for 1 hour, then raise the temperature to 220°C and turn on the blower to continue drying for 1 hour.
[0016] Standard specimens were prepared using an injection molding machine, and their tensile strength, flexural strength, impact strength, coefficient of friction, and wear value were tested. The experimental results are shown in Table 1. The relationship between the material's coefficient of friction and the experimental time is shown in [Table 1]. Figure 1 . Example 2
[0017] Take 74.5% PEEK resin powder, 10% PTFE powder, 10% hexagonal boron nitride, 5% glass fiber, 0.4% fluorinated lubricant, and 0.1% antioxidant. Mix all components except glass fiber thoroughly and uniformly. Add the mixture to the granulator through the main feed port, while the glass fiber is added directly to the pre-mixed melt through the side feed port. Then, thoroughly mix, extrude, and pelletize using a twin-screw extruder to obtain the composite material granules.
[0018] The aforementioned fluorinated lubricant is PFA.
[0019] The antioxidant mentioned above is PEPQ.
[0020] Before use, hexagonal boron nitride undergoes surface treatment, which is as follows: Take 2% of maleic anhydride by mass of hexagonal boron nitride, grind it, mix it thoroughly with hexagonal boron nitride, place it in an oven at 195°C and let it stand for 1 hour, then raise the temperature to 220°C and turn on the blower to continue drying for 1 hour.
[0021] Standard specimens were prepared using an injection molding machine, and their tensile strength, flexural strength, impact strength, coefficient of friction, and wear value were tested. The experimental results are shown in Table 1. Example 3
[0022] Take 74% PEEK resin powder, 5.7% PTFE powder, 10% hexagonal boron nitride, 10% glass fiber, 0.1% fluorinated lubricant, and 0.2% antioxidant. Thoroughly mix all components except glass fiber, and add the mixture to the granulator through the main feed port. Add the glass fiber directly to the pre-mixed melt through the side feed port. Then, thoroughly mix, extrude, and pelletize using a twin-screw extruder to obtain the composite material granules.
[0023] The aforementioned fluorinated lubricant is PFA.
[0024] The antioxidant mentioned above is PEPQ.
[0025] Before use, hexagonal boron nitride undergoes surface treatment, which is as follows: Take 3% of maleic anhydride by mass of hexagonal boron nitride, grind it, mix it thoroughly with hexagonal boron nitride, place it in an oven at 195°C and let it stand for 2 hours, then raise the temperature to 220°C and turn on the blower to continue drying for 1 hour.
[0026] Standard specimens were prepared using an injection molding machine, and their tensile strength, flexural strength, impact strength, coefficient of friction, and wear value were tested. The experimental results are shown in Table 1. Example 4
[0027] Take 74.5% PEEK resin powder, 10% PTFE powder, 5.3% hexagonal boron nitride, 10% glass fiber, 0.1% fluorinated lubricant, and 0.1% antioxidant. Thoroughly mix all components except glass fiber, and add the mixture to the granulator through the main feed port. Add the glass fiber directly to the pre-mixed melt through the side feed port. Then, thoroughly mix, extrude, and pelletize using a twin-screw extruder to obtain the composite material granules.
[0028] The aforementioned fluorinated lubricant is PVDF.
[0029] The antioxidant mentioned above is SARAFOS 2628.
[0030] Before use, hexagonal boron nitride undergoes surface treatment, which is as follows: Take 1% maleic anhydride by mass of hexagonal boron nitride, grind it, mix it thoroughly with hexagonal boron nitride, place it in an oven at 195°C and let it stand for 1 hour, then raise the temperature to 220°C and turn on the blower to continue drying for 1 hour.
[0031] Standard specimens were prepared using an injection molding machine, and their tensile strength, flexural strength, impact strength, coefficient of friction, and wear value were tested. The experimental results are shown in Table 1. Comparative Example 1
[0032] Take 99.8% PEEK resin powder, 0.1% fluorinated lubricant, and 0.1% antioxidant; mix all the above components thoroughly and uniformly, and add them to the granulator through the main feed port. The mixture is then thoroughly mixed, extruded, and pelletized using a twin-screw extruder to obtain the product granules.
[0033] The aforementioned fluorinated lubricant is PVDF.
[0034] The antioxidant mentioned above is PEPQ.
[0035] Standard specimens were prepared using an injection molding machine, and their tensile strength, flexural strength, impact strength, coefficient of friction, and wear value were tested. The experimental results are shown in Table 1. The relationship between the material's coefficient of friction and the experimental time is shown in [Table 1]. Figure 1 .
[0036] Table 1. Tensile strength, flexural strength, coefficient of friction, and wear value of different formulations.
[0037] Comparing the above data, it is evident that the composite material described in this invention exhibits a significantly improved coefficient of friction compared to traditional PEEK materials. Furthermore, its tensile strength, flexural strength, and impact strength are all higher than those of traditional PEEK materials. It can be applied to scenarios requiring insulation and wear resistance, thus replacing traditional PEEK materials.
Claims
1. An insulating and wear-resistant polyetheretherketone composite material, characterized in that, The product comprises the following components: 70-80% PEEK resin powder, 5-10% PTFE powder, 5-10% hexagonal boron nitride, 5-10% glass fiber, 0.1-0.5% fluorinated lubricant, and 0.1-0.2% antioxidant. All components except glass fiber are thoroughly mixed and fed into the granulator through the main feed port. Glass fiber is added directly to the pre-mixed melt through the side feed port. The mixture is then thoroughly mixed, extruded, and pelletized using a twin-screw extruder to obtain composite material granules.
2. The insulating and wear-resistant polyetheretherketone composite material according to claim 1, characterized in that... The fluorinated lubricant is one or both of polyvinylidene fluoride (PVDF) and perfluoroalkyl compounds (PFA).
3. The insulating and wear-resistant polyetheretherketone composite material according to claim 1, characterized in that... The antioxidant is one or more of PEPQ (organophosphate antioxidant) or SARAFOS 2628 (bis(dicumylphenyl) pentaerythritol diphosphite).
4. The insulating and wear-resistant polyetheretherketone composite material according to claim 1, characterized in that... Before use, the hexagonal boron nitride undergoes surface treatment, which is as follows: take 1%-3% of maleic anhydride by mass of hexagonal boron nitride, grind it, mix it thoroughly with hexagonal boron nitride, place it in an oven at 195°C and let it stand for 1-2 hours, then raise the temperature to 220°C and turn on the blower to continue drying for 1 hour.