Self-lubricating material based on recycled fiber reinforced polymer matrix and preparation method of self-lubricating material

Abstract

The invention provides a self-lubricating material based on a recycled fiber reinforced polymer matrix and a preparation method of the self-lubricating material, and belongs to the technical field of high polymer materials. The invention discloses a self-lubricating material based on a recycled fiber reinforced polymer matrix. The self-lubricating material is prepared from the following components in percentage by mass: 52 to 58 weight percent of polyether-ether-ketone, 23 to 27 weight percent of recycled fiber, 4 weight percent of submicron zinc sulfide, 4 weight percent of submicron titanium dioxide and 2 weight percent of silicon dioxide. The balance of graphite; wherein the recycled fibers are selected from at least one of recycled carbon fibers and recycled glass fibers.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically a self-lubricating material based on recycled fiber reinforced polymer and its preparation method. Background Technology

[0002] Lightweight fiber-reinforced polymer composites are widely used in the automotive and aerospace industries due to their outstanding mechanical properties, excellent wear resistance, and corrosion resistance. Typically, polymer-based high-performance self-lubricating materials are synthesized using virgin fibers.

[0003] With increasing environmental awareness, a large number of fiber-reinforced composite materials are being recycled after reaching their service life to reduce material waste and environmental pollution. To fully utilize the recycled fibers, using them as reinforcing materials to synthesize polymer-based high-performance self-lubricating materials is an effective approach. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a self-lubricating material based on recycled fiber-reinforced polymer matrix and its preparation method. This method effectively utilizes recycled fibers to synthesize high-performance friction materials, thereby reducing material waste and environmental pollution caused by waste disposal to a certain extent, and transforming waste into comprehensive high-performance products.

[0005] The objective of this invention can be achieved through the following technical solutions: A self-lubricating material based on recycled fiber-reinforced polymer matrix, comprising the following components by mass percentage: Polyetheretherketone 52-58 wt%, 23-27 wt% of recycled fibers 4 wt% submicron zinc sulfide 4 wt% submicron titanium dioxide 2 wt% silicon dioxide Remaining graphite; The recycled fiber is selected from at least one of recycled carbon fiber and recycled glass fiber.

[0006] A method for preparing a self-lubricating material includes the following steps: S1. The granular masterbatch 1, granular masterbatch 2 and polyetheretherketone granules are dried at 80°C for 20 hours. The granular masterbatch 1 includes polyetheretherketone, submicron zinc sulfide particles and submicron titanium dioxide particles, and the granular masterbatch 2 includes polyetheretherketone and nano-sized silica particles. S2. The dried granular masterbatch 1, granular masterbatch 2 and polyether ether ketone granules are mechanically mixed and fed from the main feed port of the extruder at a rate of 5 kg / h. The recycled glass fiber and graphite are fed synchronously from the side feed port through the vibrating feed trough and melt-blended in the extruder with 11 temperature zones. S3. The extrudate is cooled by water and granulated to obtain composite granules.

[0007] In the above-mentioned method for preparing self-lubricating materials, the ratio of polyetheretherketone, submicron zinc sulfide particles, and submicron titanium dioxide particles in the granular masterbatch 1 is 60:20:20, wherein the weights of polyetheretherketone, submicron zinc sulfide particles, and submicron titanium dioxide particles in the granular masterbatch 1 are 12wt%, 4wt%, and 4wt% of the total weight, respectively.

[0008] In the above-mentioned method for preparing self-lubricating materials, the ratio of polyether ether ketone and nano-sized silica particles in the granular masterbatch 2 is 80:20, wherein the weights of polyether ether ketone and nano-sized silica particles in the granular masterbatch 2 are 8wt% and 2wt% of the total weight, respectively.

[0009] In the above-mentioned method for preparing self-lubricating materials, in step S2, the temperature gradient of the 11 temperature zones is 120℃, 190℃, 290℃, 350℃, 370℃, 385℃, 395℃, 395℃, 395℃, 395℃, 395℃, 395℃.

[0010] A wear-resistant component, made of the aforementioned self-lubricating material, is used in conjunction with a metal friction pair under unlubricated conditions, exhibiting a coefficient of friction ≤0.43 and a wear rate ≤3.27×10⁻⁶. -6 mm³ / (N·m).

[0011] Compared with the prior art, this application has the following advantages: Compared with existing materials, the material of this invention uses recycled materials to synthesize high-performance self-lubricating materials. On the one hand, the superior tribological properties of the material can reduce the energy consumption of the parts during use. On the other hand, since the raw materials are all recyclable, the consumption of raw materials, as well as the energy consumption and carbon emissions of the material production, can be significantly reduced. Attached Figure Description

[0012] Figure 1 The 100Cr6 ring used in the friction test in this application is made of steel; Figure 2 This is a friction sample of the recycled glass fiber PEEK material used in this application.

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] A self-lubricating material based on a recycled fiber reinforced polymer matrix is ​​composed of the following components by mass percentage: 52-58 wt% polyetheretherketone, 23-27 wt% recycled fiber, 4 wt% submicron zinc sulfide, 4 wt% submicron titanium dioxide, 2 wt% silicon dioxide; the balance being graphite; wherein the recycled fiber is selected from at least one of recycled carbon fiber and recycled glass fiber.

[0015] In this application, since the manufacturing process of virgin carbon fiber requires a lot of energy, the carbon footprint is high. Using recycled fibers to synthesize friction materials can effectively reduce carbon dioxide emissions and reduce environmental pollution. The technical solution of this invention is to use recycled reinforcing fibers, including carbon fiber and glass fiber, to synthesize high-performance self-lubricating materials based on polyetheretherketone.

[0016] Graphite is used here. As a solid lubricant with fewer limitations due to the operating environment, graphite reduces frictional resistance at the sliding interface, alleviates the generation of frictional heat, maintains the mechanical properties of polymer-based friction materials, and ensures their wear resistance.

[0017] A method for preparing a self-lubricating material includes the following steps: S1. The granular masterbatch 1, granular masterbatch 2 and polyetheretherketone granules are dried at 80°C for 20 hours. The granular masterbatch 1 includes polyetheretherketone, submicron zinc sulfide particles and submicron titanium dioxide particles, and the granular masterbatch 2 includes polyetheretherketone and nano-sized silica particles. S2. The dried granular masterbatch 1, granular masterbatch 2 and polyether ether ketone granules are mechanically mixed and fed from the main feed port of the extruder at a rate of 5 kg / h. The recycled glass fiber and graphite are fed synchronously from the side feed port through the vibrating feed trough and melt-blended in the extruder with 11 temperature zones. In conventional processing methods, polymer substrates are directly mixed with other fillers. Due to the extremely small particle size and high specific surface area of ​​nanomaterials, agglomeration of nanomaterials is prone to occur during mixing, resulting in highly uneven distribution and reduced mechanical and tribological properties, leading to unstable material performance. Therefore, pre-preparing granular masterbatch 1 and granular masterbatch 2 is beneficial compared to using pre-prepared masterbatches, as it ensures good dispersion of microparticles, allows for precise control of filler ratios, and improves processing stability.

[0018] S3. The extrudate is cooled by water and granulated to obtain composite granules.

[0019] Compared with existing materials, the material of this invention uses recycled materials to synthesize high-performance self-lubricating materials. On the one hand, the superior tribological properties of the material can reduce the energy consumption of parts during use. On the other hand, since the raw materials are all recyclable, the consumption of raw materials, as well as the energy consumption and carbon emissions of material production, can be significantly reduced. Therefore, the application of this material can make a significant contribution to the circular economy.

[0020] Specifically, the ratio of polyetheretherketone, submicron zinc sulfide particles, and submicron titanium dioxide particles in granular masterbatch 1 is 60:20:20, wherein the weights of polyetheretherketone, submicron zinc sulfide particles, and submicron titanium dioxide particles in granular masterbatch 1 are 12wt%, 4wt%, and 4wt% of the total weight, respectively.

[0021] Specifically, the ratio of polyetheretherketone (PEEK) to nano-sized silica particles in granular masterbatch 2 is 80:20, wherein the weights of PEEK and nano-sized silica particles in granular masterbatch 2 are 8wt% and 2wt% of the total weight, respectively.

[0022] Specifically, in step S2, the temperature gradient of the 11 temperature zones is 120℃, 190℃, 290℃, 350℃, 370℃, 385℃, 395℃, 395℃, 395℃, 395℃, 395℃.

[0023] A wear-resistant component, made of the aforementioned self-lubricating material, is used in conjunction with a metal friction pair under unlubricated conditions, exhibiting a coefficient of friction ≤0.43 and a wear rate ≤3.27×10⁻⁶. -6 mm³ / (N·m).

[0024] One advantage of the use of this invention is reflected in the friction and wear performance of the metal friction pair. The tribological performance of the system depends on the selected test conditions, the selected alloy, the surface roughness of the metal friction components, and the load conditions generated by the relative velocity, pressure, and temperature in the cross-sectional area.

[0025] To determine the tribological properties, block-on-ring tests were conducted on the material at room temperature (23°C). Tests were performed at different contact pressures (pressure loads) (p = 1 MPa, 4 MPa, 8 MPa, and 25 MPa) and different speeds (v = 1 m / s, 1.7 m / s, 2 m / s, 3.5 m / s, and 4 m / s). The testing phase began after the break-in period.

[0026] The test block was made of the test material; the ring was made of steel (100Cr6). The wear rate was measured by determining the mass loss. The coefficient of friction (COF) and wear rate ws were determined without the use of lubricant

[10] . -6 mm 3 / Nm]. The wear rate is calculated based on the mass loss of the sample, according to the formula: ws= (Δm) / (ρ·FN·v·t), where Δm is the mass loss, ρ is the density of the test material, FN is the contact pressure of the sample, v is the sliding speed, and t is the test duration.

[0027] The following data were tested using a material made of polyetheretherketone (PEEK) 55wt%, recycled fiber 25wt%, submicron zinc sulfide 4wt%, submicron titanium dioxide 4wt%, silicon dioxide 2wt%, with the remainder being graphite.

[0028] The friction coefficient and wear rate values ​​in Tables 1 and 2 were obtained on a ring block test bench at 23°C. The arithmetic mean roughness (Ra) of the steel ring was 0.2 µm. Comparative Examples 1, 2, and 3 used Ketron GF30 PEEK; Ketron GF30 PEEK is a prior art material.

[0029] Table 1: Coefficients of friction under different contact pressures and sliding speeds.

[0030]

[0031] Table 2: Wear rate under different contact pressures and sliding speeds.

[0032]

[0033] As shown in Tables 1 and 2, the wear rate of the component from this application significantly decreased with increasing pressure, as demonstrated in the ring block test. Furthermore, compared to Comparative Examples 1, 2, and 3, the coefficient of friction significantly decreased after increasing pressure. In the system where this material is used, the friction factor decreased significantly with increasing load. This characteristic significantly suppresses the increase in energy consumption and material temperature rise under high load conditions, preventing premature failure of the friction pair due to high interface temperatures. Simultaneously, the system wear rate also showed significant optimization under high load conditions. These performance improvements stem from the self-lubricating properties of the substrate, the drag-reducing effect of the solid lubricant, the mechanical reinforcement of glass fiber at the interface, and the synergistic effect of micro-inorganic fillers in the material and at the friction interface. The stable and excellent friction properties demonstrate the combined results of material design and optimized processing technology.

[0034] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A recycled fiber reinforced polymer-based self-lubricating material, consisting of the following components in mass percentage: Polyether ether ketone 52-58wt%, Recycled fiber 23-27wt%, Sub-micron zinc sulfide 4wt%, Sub-micron titanium dioxide 4wt%, Silicon dioxide 2wt%; The balance is graphite; Wherein, the recycled fiber is selected from at least one of recycled carbon fiber, recycled glass fiber.

2. A method for preparing a self-lubricating material, comprising the following steps: S1, dry granular masterbatch 1, granular masterbatch 2 and polyether ether ketone pellets at 80℃ for 20 hours, wherein the granular masterbatch 1 comprises polyether ether ketone, sub-micron zinc sulfide particles, sub-micron titanium dioxide particles, and the granular masterbatch 2 comprises polyether ether ketone and nano-sized silicon dioxide particles; S2, mechanically mix the dried granular masterbatch 1, granular masterbatch 2 and polyether ether ketone pellets, feed from the main feed port of the extruder at a rate of 5kg / h, and simultaneously feed recycled glass fiber and graphite through the side feed port of the vibrating feeder, melt blend in the 11-section temperature control extruder; S3, water cooling and granulation of the extrudate to obtain composite pellets.

3. The self-lubricating material of claim 1, wherein The proportion of polyether ether ketone, sub-micron zinc sulfide particles and sub-micron titanium dioxide particles in the granular masterbatch 1 is 60:20:20, wherein, The weight of polyether ether ketone, sub-micron zinc sulfide particles and sub-micron titanium dioxide particles in the granular masterbatch 1 is 12wt%, 4wt% and 4wt% of the total weight, respectively.

4. The self-lubricating material of claim 1, wherein, The proportion of polyether ether ketone and nano-sized silicon dioxide particles in the granular masterbatch 2 is 80:20, wherein the weight of polyether ether ketone and nano-sized silicon dioxide particles in the granular masterbatch 2 is 8wt% and 2wt% of the total weight.

5. The self-lubricating material of claim 1, wherein, In step S2, the temperature gradient of the 11-section temperature zone is 120℃, 190℃, 290℃, 350℃, 370℃, 385℃, 395℃, 395℃, 395℃, 395℃, 395℃.

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