High-lubricity polypropylene artificial bone joint and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials and biomedical materials, in particular to a high-lubricity polypropylene artificial bone joint and a preparation method thereof. The artificial bone joint is prepared from the following raw materials: a base material, a lubrication modifier, a silane coupling agent, a reinforcing agent and an antioxidant, the addition amounts of the base material, the lubrication modifier, the silane coupling agent, the reinforcing agent and the antioxidant are respectively 50-90 parts by mass, 1-20 parts by mass, 1-10 parts by mass, 0.5-5 parts by mass and 0.1-5 parts by mass. The finally prepared high-lubricity polypropylene artificial bone joint has high impact resistance, corrosion resistance, wear resistance and lubricity, small specific gravity, excellent chemical stability and good biocompatibility, and can be widely applied to the technical fields of high polymer materials and biomedical materials.

Description

Technical Field

[0001] The present invention belongs to the technical fields of polymer materials and biomedical materials, and particularly relates to a highly lubricious polypropylene artificial joint and a preparation method thereof. Background Art

[0002] With the development of medical technology and the extension of human lifespan, the incidence of joint diseases (such as osteoarthritis, joint injuries, and osteonecrosis) has been increasing year by year. Artificial joint replacement surgery has become one of the important means for treating severe joint diseases. Artificial joint materials need to possess excellent mechanical properties, biocompatibility, and wear resistance. However, the performance of artificial joint materials is crucial for their clinical application effects. In particular, the friction, lubrication performance, and wear resistance of the materials directly affect the service life of the joints and the quality of life of patients.

[0003] Currently, artificial joint materials mainly include metal materials and ceramic materials. Among them, metal materials (such as titanium alloys and cobalt-chromium alloys) have high strength, good corrosion resistance, and relatively strong wear resistance. However, they have a relatively large specific gravity, which can easily cause discomfort to patients, and their biocompatibility is limited. Long-term implantation may lead to the release of metal ions and allergic reactions. Ceramic materials (such as alumina and zirconia) have good biocompatibility and relatively good wear resistance, but they are brittle and have poor impact resistance. They may break due to uneven stress. In addition, they have a high cost and are difficult to meet the requirements of wide application.

[0004] Based on the above analysis, researchers have tried to develop more advantageous artificial joint materials. For example, polypropylene (PP). As a lightweight polymer material, polypropylene has excellent chemical stability, low density, good biocompatibility, and corrosion resistance. However, unmodified polypropylene has a relatively high coefficient of friction, poor wear resistance, and lubrication performance, which limits its application in artificial joints. Therefore, developing a highly lubricious polypropylene artificial joint material has important research value and application prospects. Summary of the Invention

[0005] The purpose of the present invention is to overcome the drawbacks existing in the prior art and provide a highly lubricious polypropylene artificial joint and a preparation method thereof to replace metal and ceramic materials and solve the problems of large specific gravity, poor impact resistance, and high cost existing in the existing materials. The artificial joint obtained by optimizing the formula has excellent mechanical properties and wear resistance, and at the same time significantly improves the lubrication performance. Thus, it meets the requirements of artificial joint applications and solves the problems of insufficient lubrication performance and poor wear resistance when existing polypropylene is applied to artificial joints.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A highly lubricious polypropylene artificial joint

[0008] The highly lubricious polypropylene artificial joint is made from the following raw materials: matrix material, lubricating modifier, silane coupling agent, reinforcing agent, antioxidant;

[0009] The addition amounts of the matrix material, lubricating modifier, silane coupling agent, reinforcing agent, and antioxidant are respectively: 50 - 90 parts by mass, 1 - 20 parts by mass, 1 - 10 parts by mass, 0.5 - 5 parts by mass, 0.1 - 5 parts by mass.

[0010] As a further preference for a highly lubricious polypropylene artificial joint,

[0011] Preferably, the addition amounts of the matrix material, lubricating modifier, silane coupling agent, reinforcing agent, and antioxidant are respectively: 70 - 81 parts by mass, 9 - 20 parts by mass, 5 - 8 parts by mass, 1 - 3 parts by mass, 0.5 - 1.5 parts by mass.

[0012] Preferably, the matrix material is block copolymerized polypropylene (PP), and the content of ethylene in the block copolymerized polypropylene is 12%. It is used to provide excellent mechanical strength and chemical stability.

[0013] Preferably, the lubricating modifier is polytetrafluoroethylene (PTFE). As a lubricating modifier, it reduces the friction coefficient and improves the wear resistance; the reinforcing agent is nano - silica (SiO 2 ), which is mainly used as a reinforcing filler to improve the rigidity and wear resistance of the material; the antioxidant is pentaerythritol tetra[β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate].

[0014] Preferably, the silane coupling agent includes one or two of 3 - vinylaminopropyltriethoxysilane (KH - 560) and 3 - (2 - methoxyethyl) acrylate silane (Silquest A - 187). The main purpose is to enhance the interfacial bonding force between the filler and the matrix, and further improve the material strength and stability.

[0015] The present invention also provides a preparation method for a highly lubricious polypropylene artificial joint, which is characterized in that the method includes:

[0016] S1. Pretreatment of raw materials: Weigh the corresponding weights of the matrix material, lubricating modifier, silane coupling agent, reinforcing agent, and antioxidant; dry the matrix material, lubricating modifier, and reinforcing agent to remove moisture. The temperature of the drying treatment is 35 - 100 °C, and the drying time is 1 - 4 h;

[0017] S2. Preparation of the polypropylene system: Mix the dried matrix material, lubricating modifier, reinforcing agent, silane coupling agent, and antioxidant in proportion to form a polypropylene system;

[0018] S3. Extrusion and pelletization: Put the polypropylene system into an extruder for melt blending, extrude the molten mixture into a molded shape, and cool and pelletize it to obtain uniformly dispersed highly lubricating polypropylene pellets.

[0019] S4. Injection molding: Put the above-mentioned highly lubricating polypropylene pellets into an injection molding machine, and use the injection molding process to process the composite material into the structural parts required for artificial bone joints, and perform surface polishing treatment to finally produce a highly lubricating polypropylene artificial bone joint.

[0020] As a further preference for the preparation method of a highly lubricating polypropylene artificial bone joint.

[0021] Preferably, in step S2, the rotation speed of the stirrer is 60 - 150 rpm, the processing temperature is 20 - 35 °C, and the stirring time is 20 - 80 min.

[0022] Preferably, in step S3, the extrusion and pelletization steps are as follows: Step 1, turn on the extruder for preheating, and at the same time turn on the water cooling device, and set the temperatures of each zone (specifically: 100 - 180 °C for zones 1 to 4, 180 - 270 °C for zones 5 to 8); Step 2, add the mixed polypropylene system to the feed port of the extruder for melting; Step 3, run the extruder and extrude the molten mixture through the die head of the extruder; Step 4, form a long strip through water bath cooling, and lead the long strip into the pelletizer; Step 5, cut the pellets with a guillotine to obtain uniformly dispersed composite polypropylene pellets and collect them.

[0023] Preferably, in step S4, the injection molding steps are as follows: Step 1, turn on the injection molding machine for preheating, and set the barrel temperature (specifically: 140 - 220 °C for zones 1 to 2, 220 - 270 °C for zone 3); Step 2, put the composite polypropylene pellets into the hopper, and after being pushed by the screw, enter the barrel for heating and melting; Step 3, the molten polypropylene is injected into the mold cavity at a pressure of 1000 - 1200 bar and a speed of 50 - 200 cm 3 / s, and the mold temperature is 60 - 80 °C; Step 4, after injection, cool through the cooling water circuit of the mold for 20 - 60 seconds to solidify the molded composite polypropylene; Step 5, the molded product is demolded through the opening and closing of the mold to complete the production.

[0024] The beneficial effects of the present invention compared with the prior art are as follows:

[0025] (1) Compared with traditional PP artificial bone joints, the lubricity of the present invention is significantly improved, the friction coefficient is significantly reduced, and wear and loss are reduced.

[0026] (2) Compared with traditional PP artificial bone joints, the mechanical properties of the present invention are superior, the material rigidity and durability are significantly improved, and it is suitable for bearing mechanical loads for a long time;

[0027] (3) Compared with traditional metal artificial joint bones, the present invention has good biocompatibility, non-toxic and stable materials, and will not cause inflammation or rejection reactions;

[0028] (4) Compared with traditional ceramic artificial joint bones, the preparation process of the present invention is simple and controllable. By using the melt blending and injection molding processes, it is suitable for large-scale production;

[0029] (5) In addition, by optimizing the experimental formula, the obtained polypropylene artificial joint bones have higher tensile strength, flexural modulus, lower friction coefficient and volume wear rate compared with traditional PP artificial joint bones, which can reduce the maintenance and replacement costs. Description of the Drawings

[0030] Figure 1 It is a bar chart of the friction coefficients of the artificial joint bones in Examples 1-4.

[0031] Figure 2 It is a bar chart of the wear resistance rates of the artificial joint bones in Examples 1-4.

[0032] Figure 3 It is a bar chart of the tensile strength and flexural modulus of the artificial joint bones in Examples 1-7 and the comparative example.

[0033] Figure 4 It is a bar chart of the friction coefficients and wear rates of the artificial joint bones in Example 1 and the comparative example.

[0034] Figure 5 It is the SEM scanning electron micrograph of Example 1 at a magnification of 1k;

[0035] Figure 6 It is the SEM scanning electron micrograph of Example 1 at a magnification of 5k;

[0036] Figure 7 It is the SEM scanning electron micrograph of Example 1 at a magnification of 30k. Detailed Embodiments

[0037] The above preparation method of the present invention will be described below through specific examples and comparative examples.

[0038] Example 1

[0039] This example provides a highly lubricious polypropylene artificial joint bone and its preparation method.

[0040] A highly lubricious polypropylene artificial joint, the artificial joint is made from the following raw materials: 70 parts by mass of block copolymerized polypropylene (PP) (ethylene content 12%), 20 parts by mass of polytetrafluoroethylene, 5 parts by mass of 3-(2-methoxyethyl) acrylate silane (Silquest A-187), 1 part by mass of nano-silica, and 0.5 part by mass of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate].

[0041] The method for preparing a highly lubricious polypropylene artificial joint comprises the following steps:

[0042] S1. Weigh the corresponding weights of polypropylene, polytetrafluoroethylene, 3-(2-methoxyethyl) acrylate silane (Silquest A-187), nano-silica, and pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate]; place polypropylene, polytetrafluoroethylene, and nano-silica in a drying oven at 80°C for 2 h respectively to remove moisture.

[0043] S2. Add polypropylene, polytetrafluoroethylene, Silquest A-187, and nano-silica to a high-speed stirrer and stir at a rotation speed of 100 rpm and a processing temperature of 30°C for 50 min to form a polypropylene system.

[0044] S3. Extrusion and pelletizing: Place the polypropylene system into an extruder for melt blending, extrude and shape the molten mixture, and cool and pelletize to obtain uniformly dispersed highly lubricious polypropylene pellets.

[0045] S4. Injection molding: Place the above-mentioned highly lubricious polypropylene pellets into an injection molding machine, and use the injection molding process to process the composite material into the structural parts required for the artificial joint, and perform surface polishing treatment to finally produce a highly lubricious polypropylene artificial joint.

[0046] According to the above method, a highly lubricious polypropylene artificial joint is obtained.

[0047] Example 2

[0048] This example provides a highly lubricious polypropylene artificial joint and its preparation method.

[0049] A highly lubricious polypropylene artificial joint, the artificial joint is made from the following raw materials: 81 parts by mass of block copolymerized polypropylene (PP) (ethylene content 12%), 9 parts by mass of polytetrafluoroethylene, 6 parts by mass of 3-(2-methoxyethyl) acrylate silane (Silquest A-187), 5 parts by mass of nano-silica, and 5 parts by mass of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate].

[0050] The method for preparing a polypropylene artificial joint with high lubricity includes the following steps:

[0051] S1. Weigh the corresponding amounts of polypropylene, polytetrafluoroethylene, 3-(2-methoxyethyl) acrylate silane (Silquest A-187), nano-silica, and pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate]; Place polypropylene, polytetrafluoroethylene, and nano-silica in a drying oven at 35°C for 1 h to remove moisture;

[0052] S2. Add polypropylene, polytetrafluoroethylene, Silquest A-187, and nano-silica to a high-speed stirrer and stir at a rotation speed of 60 rpm and a processing temperature of 20°C for 20 min to form a polypropylene system;

[0053] S3. Extrusion and pelletization: Place the polypropylene system in an extruder for melt blending, extrude and shape the molten mixture, and cool and pelletize to obtain uniformly dispersed high-lubricity polypropylene pellets.

[0054] S4. Injection molding: Place the above-mentioned high-lubricity polypropylene pellets in an injection molding machine, use the injection molding process to process the composite material into the structural parts required for the artificial joint, and perform surface polishing treatment to finally produce a polypropylene artificial joint with high lubricity.

[0055] Example 3

[0056] According to the above method, a polypropylene artificial joint with high lubricity is obtained.

[0057] This example provides a polypropylene artificial joint with high lubricity and its preparation method.

[0058] A polypropylene artificial joint with high lubricity, wherein the artificial joint is made of the following raw materials: 50 parts by mass of block copolymer polypropylene (PP) (ethylene content 12%), 1 part by mass of polytetrafluoroethylene, 1 part by mass of 3-(2-methoxyethyl) acrylate silane (Silquest A-187), 0.5 part by mass of nano-silica, and 0.1 part by mass of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate].

[0059] The method for preparing a polypropylene artificial joint with high lubricity includes the following steps:

[0060] S1. Weigh the corresponding amounts of polypropylene, polytetrafluoroethylene, 3-(2-methoxyethyl) acrylate silane (Silquest A-187), nano-silica, and pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate]; Place polypropylene, polytetrafluoroethylene, and nano-silica in a drying oven at 100°C for 4 h to remove moisture;

[0061] S2. Add polypropylene, polytetrafluoroethylene, Silquest A-187, and nano-silica into a high-speed stirrer and stir for 80 min at a rotation speed of 150 rpm and a processing temperature of 35 °C to form a polypropylene system.

[0062] S3. Extrusion and pelletizing: Put the polypropylene system into an extruder for melt blending, extrude and shape the molten mixture, and cool and pelletize it to obtain uniformly dispersed high-lubricity polypropylene pellets.

[0063] S4. Injection molding: Put the above-mentioned high-lubricity polypropylene pellets into an injection molding machine, process the composite material into the structural parts required for artificial bone joints by injection molding process, and perform surface polishing treatment to finally make a high-lubricity polypropylene artificial bone joint.

[0064] According to the above method, a high-lubricity polypropylene artificial bone joint is obtained.

[0065] Example 4

[0066] According to the above method, a high-lubricity polypropylene artificial bone joint is obtained.

[0067] This example provides a high-lubricity polypropylene artificial bone joint and its preparation method.

[0068] A high-lubricity polypropylene artificial bone joint, the artificial bone joint is made of the following raw materials: 90 parts by mass of block copolymer polypropylene (PP) (ethylene content 12%), 1 part by mass of polytetrafluoroethylene, 10 parts by mass of 3-(2-methoxyethyl) acrylate silane (Silquest A-187), 5 parts by mass of nano-silica, and 5 parts by mass of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate].

[0069] The method for preparing a high-lubricity polypropylene artificial bone joint includes the following steps:

[0070] S1. Weigh the corresponding weights of polypropylene, polytetrafluoroethylene, 3-(2-methoxyethyl) acrylate silane (Silquest A-187), nano-silica, and pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate]; place polypropylene, polytetrafluoroethylene, and nano-silica in a drying oven at 100 °C for 4 h to remove moisture.

[0071] S2. Add polypropylene, polytetrafluoroethylene, Silquest A-187, and nano-silica into a high-speed stirrer and stir for 80 min at a rotation speed of 150 rpm and a processing temperature of 35 °C to form a polypropylene system.

[0072] S3. Extrusion and pelletization: Put the polypropylene system into an extruder for melt blending, extrude the molten mixture into a molded shape, and cool and pelletize it to obtain uniformly dispersed high-lubricity polypropylene pellets.

[0073] S4. Injection molding: Put the above-mentioned high-lubricity polypropylene pellets into an injection molding machine, and use the injection molding process to process the composite material into the structural parts required for artificial bone joints, and perform surface polishing treatment to finally produce high-lubricity polypropylene artificial bone joints.

[0074] According to the above method, a high-lubricity polypropylene artificial bone joint is obtained.

[0075] Examples 5 - 6

[0076] The differences between Examples 5 - 6 and Example 1 are that, under the condition that the masses of other components remain unchanged, the masses of nano-silica and pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] become 1.5 times and 3 times of the original respectively.

[0077] Example 7

[0078] The differences between Example 7 and Example 1 are that, under the condition that the preparation process remains unchanged, the contents of each component become: 75 parts by mass of block copolymerized polypropylene (PP) (ethylene content 12%), 15 parts by mass of polytetrafluoroethylene, 8 parts by mass of 3-(2-methoxyethyl) acrylate silane (Silquest A-187), 1.5 parts by mass of nano-silica, and 0.75 part by mass of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0079] Comparative example

[0080] A polypropylene artificial bone joint is made from the following raw materials: 70 parts by mass of block copolymerized polypropylene (PP) (ethylene content 12%).

[0081] The method for preparing a high-lubricity polypropylene artificial bone joint includes the following steps:

[0082] S1. Weigh the corresponding weight of polypropylene, and place the polypropylene in a drying oven at 80 °C for 2 h to remove moisture.

[0083] S2. Extrusion and pelletization: Put the polypropylene into an extruder for melt blending, extrude the molten mixture into a molded shape, and cool and pelletize it to obtain uniformly dispersed polypropylene pellets.

[0084] S3. Injection molding: Put the above-mentioned polypropylene pellets into an injection molding machine, and use the injection molding process to process the composite material into the structural parts required for artificial bone joints, and perform surface polishing treatment to finally produce polypropylene artificial bone joints.

[0085] According to the above method, a polypropylene artificial joint is obtained.

[0086] The polypropylene artificial joints prepared in Examples 1-7 and Comparative Examples were tested for coefficient of friction, tensile strength, flexural modulus, and wear rate, and the results are as follows. Figures 1-4 .

[0087] Figure 1 Figure 1 is a bar chart of the coefficient of friction of the highly lubricious polypropylene artificial joints prepared in Examples 1-4. It can be seen that the coefficient of friction of Examples 1-4 increases with the increase in the ratio of polypropylene to polytetrafluoroethylene. It is thus inferred that as the content of polytetrafluoroethylene decreases, the coefficient of friction increases significantly. Therefore, Example 1 is considered to have the lowest coefficient of friction among Examples 1-4.

[0088] Figure 2 Figure 2 is a bar chart of the wear resistance rate of the highly lubricious polypropylene artificial joints prepared in Examples 1-4. It can be seen that the wear resistance rate of Examples 1-4 increases with the increase in the ratio of polypropylene to polytetrafluoroethylene. It is thus inferred that as the content of polytetrafluoroethylene decreases, the wear resistance rate (i.e., the wear rate) increases significantly. Therefore, Example 1 is considered to have the lowest wear rate among Examples 1-4.

[0089] Figure 3 Figure 3 is a bar chart of the tensile strength and flexural modulus of the artificial joints prepared in Examples 1-7 and Comparative Examples. It can be seen that the tensile strength and flexural modulus of Examples 1-7 are higher than those of the Comparative Example. Among them, the tensile strength and flexural modulus of Examples 1-4 decrease with the increase in the ratio of polypropylene to polytetrafluoroethylene. It is thus inferred that as the content of polytetrafluoroethylene decreases, the tensile strength and flexural modulus decrease significantly, and the mechanical properties of the artificial joint weaken. Therefore, Example 1 is considered to have the optimal tensile strength and flexural modulus among Examples 1-4. Comparing Example 1 with Examples 5-7, it is found that the tensile strength and flexural modulus of Examples 5-6 increase with the increase in the mass of nano-silica. It is thus inferred that as the mass of nano-silica increases, the tensile strength and flexural modulus increase significantly, and the mechanical properties of the artificial joint are enhanced. However, the tensile strength and flexural modulus of Example 7 are close to those of Example 5 and are both lower than those of Example 7. Therefore, it is considered that as the mass of the coupling agent 3-(2-methoxyethyl) acrylate silane increases, the mechanical properties do not necessarily increase.

[0090] Figure 4 Figure 4 is a bar chart of the coefficient of friction and wear rate of the polypropylene artificial joints prepared in Example 1 and the Comparative Example tested by a pin-on-disc wear tester. It can be seen that the coefficient of friction and wear rate of Example 1 are significantly smaller than those of the Comparative Example. Therefore, it is considered that the wear resistance of the improved highly lubricious polypropylene artificial joint is significantly better than that of the ordinary polypropylene artificial joint, showing a lower coefficient of friction and volume loss.

[0091] Figure 5 It is the SEM image of Example 1 at a magnification of 1k. It can be seen that Example 1 shows a flat network structure at a magnification of 1k, without obvious agglomeration. This indicates that polytetrafluoroethylene and nano-SiO 2 are evenly distributed in the polypropylene matrix, and good interfacial bonding is achieved through the silane coupling agent, proving the effectiveness of this preparation process.

[0092] Figure 6 It is the SEM image of Example 1 at a magnification of 5k. It can be seen that the area except the edge is evenly flat, without obvious cracks or sharp protrusions. This indicates that this artificial joint has good wear resistance and lubricity.

[0093] Figure 7 It is the SEM image of Example 1 at a magnification of 30k. It can be seen that the particulate dispersion of various components after processing is good, without obvious agglomeration of small particles or large particles. This indicates that the processing uniformity of the particles is good.

[0094] In summary, the highly lubricious polypropylene artificial bone joint prepared by the present invention has high wear resistance, lubricity and excellent mechanical properties, and can significantly reduce costs.

[0095] According to the above method, a composition for a highly lubricious polypropylene artificial bone joint and a preparation method thereof are obtained.

[0096] The above are only exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A highly lubricating polypropylene artificial bone joint, characterized in that: The artificial bone joint is made of the following raw materials: base material, lubricating modifier, silane coupling agent, reinforcing agent, antioxidant; The addition amounts of the base material, lubricity modifier, silane coupling agent, reinforcing agent and antioxidant are 50-90 parts by mass, 1-20 parts by mass, 1-10 parts by mass, 0.5-5 parts by mass and 0.1-5 parts by mass respectively.

2. The highly lubricating polypropylene artificial bone joint according to claim 1, characterized in that: The added amounts of the base material, lubricity modifier, silane coupling agent, reinforcing agent and antioxidant are 70-81 parts by mass, 9-20 parts by mass, 5-8 parts by mass, 1-3 parts by mass and 0.5-1.5 parts by mass respectively.

3. The highly lubricating polypropylene artificial bone joint according to claim 1 or 2, wherein: The matrix material is block copolymer polypropylene (PP), and the ethylene content in the block copolymer polypropylene is 12%.

4. The highly lubricating polypropylene artificial bone joint according to claim 1 or 2, wherein: The lubricating modifier is polytetrafluoroethylene (PTFE), the reinforcing agent is nano silicon dioxide (SiO2), and the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

5. The highly lubricating polypropylene artificial bone joint according to claim 1 or 2, wherein: The silane coupling agent includes one or two of 3-vinylaminopropyltriethoxysilane (KH-560) and 3-(2-methoxyethyl)acrylate silane (SilquestA-187).

6. A method for preparing a polypropylene artificial bone joint with high lubricity according to claim 1 or 2, characterized in that: The method includes: S1. Raw material pretreatment: weigh the corresponding weight of base material, lubricating modifier, silane coupling agent, reinforcing agent, and antioxidant; dry the base material, lubricating modifier, and reinforcing agent to remove moisture; the drying temperature is 35-100° C. and the drying time is 1-4 hours; S2. Preparation of polypropylene system: mixing the dried base material, lubricating modifier, reinforcing agent, silane coupling agent and antioxidant in proportion to form a polypropylene system; S3, extrusion and granulation: the polypropylene system is placed in an extruder for melt blending, the molten mixture is extruded into a shape, and then cooled and pelletized to obtain uniformly dispersed high-lubricating polypropylene particles. S4. Injection molding: Put the above-mentioned high-lubricity polypropylene particles into an injection molding machine, use the injection molding process to process the composite material into the structural parts required for artificial bone joints, and perform surface polishing to finally make highly lubricious polypropylene artificial bone joints.

7. The method for preparing the highly lubricating polypropylene artificial bone joint according to claim 6, characterized in that: In step S2, the rotation speed of the stirrer is 60-150 rpm, the processing temperature is 20-35° C., and the stirring time is 20-80 min.

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