Medical heat-resistant polyethylene composite plastic and preparation method thereof

Abstract

The invention relates to the field of high polymer materials, in particular to medical heat-resistant polyethylene composite plastic and a preparation method thereof. Specifically, the composite material comprises the following components in percentage by weight: 2-12% of activated carbon, 0.5% of a multi-walled carbon nanotube / ZrO2 compound and the balance of ultra-high molecular weight polyethylene. By adding the multi-walled carbon nanotube / ZrO compound, the heat resistance of the polyethylene composite plastic is remarkably improved, so that the polyethylene composite plastic can adapt to a higher working temperature environment. Through the synergistic effect of the multi-walled carbon nanotubes and ZrO, the mechanical strength and toughness of the composite plastic are enhanced, and the deficiency of the mechanical property of the UHMWPE is made up.

Description

Technical Field

[0001] The present invention relates to the field of polymer materials, in particular to a medical heat-resistant polyethylene composite plastic and a preparation method thereof. Background Art

[0002] Medical ultra-high molecular weight polyethylene (UHMWPE) is a linear thermoplastic engineering plastic with a molecular weight exceeding 1.5 million. It possesses exceptional physical and mechanical properties, making it a unique polymer. It is synthesized from the simple organic compound ethylene through addition polymerization, forming a polymer with a large, long linear chain structure. Among common polyethylene types (such as LDPE, HDPE, LLDPE, and UHMWPE), UHMWPE is widely used in various fields, including biology, chemistry, medicine, and the military, due to its excellent mechanical properties.

[0003] However, compared with other engineering materials, UHMWPE has defects such as low surface hardness, insufficient mechanical strength, and poor mechanical properties, which to a certain extent limit its scope of application. With the continuous development of UHMWPE, users have also placed higher demands on it. In order to overcome these performance defects, researchers have adopted various methods to modify M-UHMWPE. For example, by adding inorganic fillers such as Al2O3, SiO2, montmorillonite, kaolin, and carbon nanotubes, its mechanical properties can be significantly improved. In recent years, the use of inorganic nanofillers to enhance UHMWPE has become a popular research direction. However, the use of activated carbon to improve UHMWPE needs further research. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a medical heat-resistant polyethylene composite plastic and a preparation method thereof.

[0005] The present invention is achieved through the following technical solutions: A medical heat-resistant polyethylene composite plastic comprises, by weight percentage, 2% to 12% activated carbon, 0.5% multi-walled carbon nanotube / ZrO2 compound, and the balance ultra-high molecular weight polyethylene.

[0006] Furthermore, the activated carbon particle size is 100 mesh.

[0007] Furthermore, the Mw of the ultra-high molecular weight polyethylene is 3 million to 6 million.

[0008] Furthermore, the preparation method of the multi-walled carbon nanotube / ZrO2 composite is as follows: MWCNT is added to deionized water and ultrasonically dispersed for 2 hours; then ZrO2 is added and stirred for 2 hours; then the mixture is transferred to a reactor, heated at 150°C for 6 hours, and then naturally cooled to room temperature, centrifuged to obtain a precipitate, washed the precipitate three times with deionized water, and then dried at 100°C for 12 hours to obtain a multi-walled carbon nanotube / ZrO2 composite.

[0009] Furthermore, the mass ratio of the MWCNT and ZrO2 is 1:3.

[0010] Furthermore, the surface area of ​​ZrO2 is ≥25 m 2 / g, particle size <100 nm.

[0011] Furthermore, the multi-walled carbon nanotubes have a length of 10-30 μm, a diameter of 10-20 nm, and a surface area of ​​233 m 2 / g.

[0012] The present invention also provides a method for preparing a medical heat-resistant polyethylene composite plastic, which is characterized in that it includes the following steps: uniformly mixing activated carbon, multi-walled carbon nanotube / ZrO2 composite and ultra-high molecular weight polyethylene, and granulating them using a co-rotating twin-screw extruder to obtain the medical heat-resistant polyethylene composite plastic.

[0013] Furthermore, the temperatures of sections 1 to 6 of the extruder are set to 135° C., 160° C., 165° C., 195° C., 210° C., and 220° C., respectively.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: The addition of a multi-walled carbon nanotube / ZrO2 composite significantly improves the heat resistance of polyethylene composite plastics, enabling them to adapt to higher operating temperature environments. The synergistic effect of multi-walled carbon nanotubes and ZrO2 enhances the mechanical strength and toughness of the composite plastic, compensating for the mechanical deficiencies of ultra-high molecular weight polyethylene (UHMWPE). BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention.

[0016] Figure 1 This is the SEM image of the multi-walled carbon nanotube / ZrO2 composite of the present invention. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0018] In the present invention, activated carbon was purchased from Sigma, with a product number of 242276 and a particle size of 100 mesh; ultra-high molecular weight polyethylene (UHMWPE) with a Mw of 3 million to 6 million; ZrO2 with a surface area of ​​≥25 m 2 / g, particle size <100 nm; multi-walled carbon nanotubes (MWCNT), length 10-30 μm, diameter 10-20 nm, surface area ≥233 m 2 / g The preparation method of the multi-walled carbon nanotube / ZrO2 composite in the present invention is: 0.1 g of MWCNT was added to 25 mL of deionized water and ultrasonically dispersed for 2 h. 0.3 g of ZrO2 was then added and stirred for 2 h. The mixture was then transferred to a reactor and heated at 150 ° C for 6 h. The mixture was then naturally cooled to room temperature and centrifuged to obtain a precipitate. The precipitate was washed three times with deionized water and dried at 100 ° C for 12 h to obtain a multi-walled carbon nanotube / ZrO2 composite. Figure 1 This is the SEM image of the multi-walled carbon nanotube / ZrO2 composite. Example

[0019] A medical heat-resistant polyethylene composite plastic comprises, by weight percentage, 2% activated carbon, 0.5% multi-walled carbon nanotube / ZrO2 compound, and the balance ultra-high molecular weight polyethylene.

[0020] The preparation method of medical heat-resistant polyethylene composite plastic is as follows: activated carbon, multi-walled carbon nanotube / ZrO2 composite and ultra-high molecular weight polyethylene are uniformly mixed, granulated with a co-rotating twin-screw extruder, and the temperatures of sections 1 to 6 of the extruder are set to 135°C, 160°C, 165°C, 195°C, 210°C and 220°C, respectively, to obtain medical heat-resistant polyethylene composite plastic. Example

[0021] A medical heat-resistant polyethylene composite plastic comprises, by weight percentage, 4% activated carbon, 0.5% multi-walled carbon nanotube / ZrO2 compound, and the balance ultra-high molecular weight polyethylene.

[0022] The preparation method is the same as that of Example 1. Example

[0023] A medical heat-resistant polyethylene composite plastic comprises, by weight percentage, 6% activated carbon, 0.5% multi-walled carbon nanotube / ZrO2 compound, and the balance ultra-high molecular weight polyethylene.

[0024] The preparation method is the same as that of Example 1. Example

[0025] A medical heat-resistant polyethylene composite plastic comprises, by weight percentage, 8% activated carbon, 0.5% multi-walled carbon nanotube / ZrO2 compound, and the balance ultra-high molecular weight polyethylene.

[0026] The preparation method is the same as that of Example 1. Example

[0027] A medical heat-resistant polyethylene composite plastic comprises, by weight percentage, 10% activated carbon, 0.5% multi-walled carbon nanotube / ZrO2 compound, and the balance ultra-high molecular weight polyethylene.

[0028] The preparation method is the same as that of Example 1. Example

[0029] A medical heat-resistant polyethylene composite plastic comprises, by weight percentage, 12% activated carbon, 0.5% multi-walled carbon nanotube / ZrO2 compound, and the balance ultra-high molecular weight polyethylene.

[0030] The preparation method is the same as that of Example 1.

[0031] Comparative Example 1 Plastics with activated carbon contents of 0%, 2%, 4%, 6%, 8%, 10%, and 12%, with the remainder being ultra-high molecular weight polyethylene and excluding multi-walled carbon nanotube / ZrO2 composites, were prepared respectively.

[0032] The preparation method is: activated carbon and ultra-high molecular weight polyethylene are mixed evenly, granulated using a co-rotating twin-screw extruder, and the temperatures of sections 1 to 6 of the extruder are set to 135°C, 160°C, 165°C, 195°C, 210°C, and 220°C, respectively, to obtain a medical heat-resistant polyethylene composite plastic.

[0033] Comparative Example 2 A medical heat-resistant polyethylene composite plastic comprises, by weight percentage, 0.5% of a multi-walled carbon nanotube / ZrO2 composite and the remainder of ultra-high molecular weight polyethylene.

[0034] Test Example 1 The plastics prepared in each example and comparative example were hot-pressed to produce standard specimens. Specifically, the heating temperature was set to 225°C. After the mold was preheated, the plastics prepared in each example and comparative example were placed evenly in the mold. The mold was heated for 1 hour under a pressure of 10 MPa. The mold was then cooled under this pressure for 4 hours to 70°C before removal from the mold to produce the standard specimens.

[0035] The heat deformation temperature (Vicat softening point) of the sample was tested using a Vicat softening temperature tester with a load of 50 N and a heating rate of 120°C / h.

[0036] Impact strength was tested according to GB / T1043.

[0037] Table 1 Performance side test Vicat softening point / ℃ <![CDATA[Impact strength (kJ / m 2 )]]> Example 1 95.7 188.6 Example 2 98.5 194.7 Example 3 100.1 201.1 Example 4 104.1 226.2 Example 5 108.2 230.3 Example 6 114.5 247.1 Comparative Example 1 (0%) 92.4 132.1 Comparative Example 1 (2%) 95.6 169.9 Comparative Example 1 (4%) 96.7 170.3 Comparative Example 1 (6%) 96.2 182.4 Comparative Example 1 (8%) 98.8 202.4 Comparative Example 1 (10%) 104.5 212.6 Comparative Example 1 (12%) 109.8 227.6 Comparative Example 2 101.2 198.3 As can be seen from Table 1, adding activated carbon and multi-walled carbon nanotube / ZrO2 composite to UHMWPE can improve the heat resistance of UHMWPE and also improve the impact strength.

[0038] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A medical heat-resistant polyethylene composite plastic, characterized in that: The composition comprises, by weight percentage, 2% to 12% activated carbon, 0.5% multi-walled carbon nanotube / ZrO2 composite, and the balance ultra-high molecular weight polyethylene.

2. The medical heat-resistant polyethylene composite plastic according to claim 1, characterized in that: The activated carbon particle size is 100 mesh.

3. The medical heat-resistant polyethylene composite plastic according to claim 2, characterized in that: The Mw of the ultra-high molecular weight polyethylene is 3 million to 6 million.

4. The medical heat-resistant polyethylene composite plastic according to claim 3, characterized in that: The preparation method of the multi-walled carbon nanotube / ZrO2 composite is as follows: multi-walled carbon nanotubes are added to deionized water and ultrasonically dispersed for 2 hours; ZrO2 is then added and stirred for 2 hours; the multi-walled carbon nanotubes are then transferred to a reactor, heated at 150°C for 6 hours, and then naturally cooled to room temperature and centrifuged to obtain a precipitate, which is washed three times with deionized water and then dried at 100°C for 12 hours to obtain a multi-walled carbon nanotube / ZrO2 composite.

5. The medical heat-resistant polyethylene composite plastic according to claim 4, characterized in that: The mass ratio of the multi-walled carbon nanotubes to ZrO2 is 1:

3.

6. The medical heat-resistant polyethylene composite plastic according to claim 5, characterized in that: The surface area of ​​ZrO2 is ≥25m 2 / g, particle size <100 nm.

7. The medical heat-resistant polyethylene composite plastic according to claim 5, characterized in that: The multi-walled carbon nanotubes have a length of 10-30 μm, a diameter of 10-20 nm, and a surface area of ​​233 m 2 / g.

8. The method for preparing the medical heat-resistant polyethylene composite plastic according to any one of claims 1 to 7, wherein: The method comprises the following steps: uniformly mixing activated carbon, multi-walled carbon nanotube / ZrO2 compound and ultra-high molecular weight polyethylene, and granulating the mixture using a co-rotating twin-screw extruder to obtain a medical heat-resistant polyethylene composite plastic.

9. The method for preparing the medical heat-resistant polyethylene composite plastic according to claim 8, characterized in that: The temperatures of sections 1 to 6 of the extruder were set to 135° C., 160° C., 165° C., 195° C., 210° C., and 220° C., respectively.

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