CN111393744B - TPE material with antibacterial conductivity and preparation method thereof - Google Patents
TPE material with antibacterial conductivity and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an antibacterial conductive TPE material and a preparation method thereof, wherein the antibacterial conductive TPE material is prepared from the following raw materials in parts by weight: 10-20 parts of SEBS rubber elastomer; 10-20 parts of mineral oil; 20-30 parts of polypropylene; 5-10 parts of polypropylene antibacterial master batch; 10-20 parts of carbon nano tubes; 15-25 parts of filler; 3-8 parts of SBS rubber elastomer; 0.2-0.5 part of auxiliary agent; wherein the carbon nanotubes are subjected to surface treatment. The TPE material with antibacterial conductivity has good antibacterial property and conductivity under the condition of ensuring the mechanical property.
Description
Technical Field
The invention belongs to the field of elastomer materials, and particularly relates to a TPE material with antibacterial conductivity and a preparation method thereof.
Background
TPE has the advantages of good mechanical property, diversified processing modes, environmental protection, comfortable touch feeling, strong designability and the like, so that the TPE is more and more widely applied to medical treatment. TPE materials can be used as anti-slip, shock-resistant, cladding, etc. materials in many medical devices, and even in core functional components. Currently, in medical devices requiring electrical conductivity, the conductive material is still mainly metal, but there are some drawbacks in using a metal material: firstly, the comfort is poor, and secondly, the material cannot be reused, so that resources are wasted, and therefore, a conductive material with certain comfort and reusability is needed to replace the metal material. TPE, which is a relatively compatible elastomer, can be used as a suitable alternative material after it has conductivity, and as a material for medical devices, it is also required to have antibacterial properties, so that a TPE material having both conductivity and antibacterial properties is required.
While TPE materials having antibacterial properties have been known in the prior art as medical devices, there are also known techniques in which carbon nanotube addition is used to make polymers conductive; however, when the antibacterial and conductive components are integrated into the TPE material, a large amount of aggregation and incompatibility of the conductive components and the antibacterial components occurs, so that the conductivity and antibacterial properties of the material are reduced, and even the mechanical properties of the material are affected.
The Chinese patent document with publication number of CN110835465A discloses preparation and application of nylon/carbon nano tube master batch for improving conductivity of materials, the preparation and application of the nylon/carbon nano tube master batch can realize surface chemical grafting modification of carbon nano tubes by acidizing the carbon nano tubes and then using a silane coupling agent, and can realize physical coating modification of the carbon nano tubes by using a polyether surfactant, so that the two modifiers can effectively change the characteristic of easy self aggregation of the carbon nano tubes by means of grafting and coating modes. However, the structure of the carbon nanotubes is damaged to a certain extent after the acidification treatment of the carbon nanotubes, the mechanical and electrical properties of the carbon nanotubes are reduced, and meanwhile, when the dispersion treatment is used in a TPE material which needs to integrate antibiosis and conductivity, the problems that the conductive components and the antibiosis components are aggregated in a large amount and cannot be compatible can not be solved.
Disclosure of Invention
Aiming at the requirements of conductivity and antibacterial property of some medical equipment and the defects of the prior art, the invention provides the TPE material with antibacterial conductivity, which meets the requirements of the TPE material on ensuring the mechanical property and has good antibacterial property and electric conductivity.
It is another object of the present invention to provide a method for preparing the TPE material.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the antibacterial conductive TPE material is prepared from the following raw materials in parts by weight: 10-20 parts of SEBS rubber elastomer; 10-20 parts of mineral oil; 20-30 parts of polypropylene; 5-10 parts of polypropylene antibacterial master batch; 10-20 parts of carbon nano tubes; 15-25 parts of filler; 3-8 parts of SBS rubber elastomer; 0.2-0.5 part of auxiliary agent;
wherein the carbon nanotubes are surface-treated carbon nanotubes.
Further, the melt index of the SEBS rubber elastomer is 5-15g/10min, and the molecular weight is 29-32 ten thousand.
Further, the mineral oil has a kinematic viscosity of 40-60mm at 40 DEG C 2 /s。
Further, the melt index of the polypropylene is 10-20g/10min, and the hardness is 70-90R.
Further, the antibacterial component of the polypropylene antibacterial master batch is a nano inorganic antibacterial agent, and the nano inorganic antibacterial agent is one or more of nano copper ions, nano zinc ions and nano silver ions; the melt index of the polypropylene antibacterial master batch is 1-10g/10min.
Further, the particle size of the carbon nanotubes is 1-70nm, the average length is 1-80 mu m, and the carbon nanotubes are one or two of double-wall carbon nanotubes and multi-wall carbon nanotubes.
Further, the filler is superfine calcium carbonate with the mesh number of 1000-1200;
the melt index of the SBS elastomer is 3-8g/10min, and the hardness is 60-80A.
Further, the effective components of the auxiliary agent are hindered phenol antioxidants and phosphite antioxidants, and the mass ratio of the hindered phenol antioxidants to the phosphite antioxidants is 1-2:1, a step of;
further, the hindered phenol antioxidant is pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and the phosphite antioxidant is tris [2, 4-di-tert-butylphenyl ] phosphite.
A method for preparing a TPE material having antimicrobial conductivity, the method comprising the steps of:
(1) Weighing raw material materials according to a proportion;
(2) Surface treatment of carbon nanotubes: putting the carbon nano tube weighed in the step (1) into o-dichlorobenzene supersaturated solution of amide beta nucleating agent, performing ultrasonic dispersion, repeatedly washing with deionized water after suction filtration, thoroughly washing away o-dichlorobenzene solvent, and finally putting the washed carbon nano tube into an oven for drying, wherein the dried product is the carbon nano tube with the beta nucleating agent coated on the surface;
(3) Adding the weighed SEBS rubber and SBS rubber in the step (1) into a stirring kettle, adding mineral oil, stirring for 5-7min to enable the mineral oil to be fully and uniformly absorbed by the rubber, and taking out for later use;
(4) Adding the weighed filler in the step (1), the modified carbon nano tube obtained in the step (2) and the auxiliary agent into a stirring kettle, stirring for 3-5min to fully disperse the materials, and taking out for later use;
(5) Adding the polypropylene and the polypropylene antibacterial master batch weighed in the step (1) into a stirring kettle, stirring for 3-5min, and taking out for standby after fully mixing;
(6) Feeding the mixed materials obtained in the steps (3), (4) and (5) into a double-screw extruder through a No. 1, a No. 2 and a No. 3 weightlessness scale, wherein the extrusion temperature is 170-240 ℃;
(7) And (3) sequentially carrying out bracing, water cooling, air cooling, granulating and packaging on the extruded material obtained in the step (6) to obtain the antibacterial conductive TPE material.
Further, the ultrasonic dispersion time in the step (2) is 3 hours, the temperature of the oven is 90 ℃, and the drying time is 3 hours;
the temperature of the twin-screw extruder is 170 ℃, 210 ℃, 230 ℃, 240 ℃, 230 ℃, 210 ℃, the temperature of the machine head is 190 ℃ and the vacuum degree is-0.05 to-0.07 Mpa.
The invention has the beneficial effects that:
1. according to the invention, through specific formula materials and proportions, a material with conductivity and antibacterial property is obtained on the premise of meeting the mechanical property required by daily use, the volume resistance of the material is less than 100 omega, and meanwhile, the antibacterial rate is more than 94.3 percent and can reach 98.9 percent at most, so that the material has better antibacterial property and conductivity.
2. According to the invention, the carbon nano tube is modified by adopting a non-covalent bond method, namely, the beta nucleating agent of polypropylene is coated on the surface of the carbon nano tube, the dispersibility of the carbon nano tube is improved by pi-pi conjugation, meanwhile, the beta nucleating agent induces the polypropylene component to form a beta crystal form, and the beta crystal form polypropylene has smaller crystal grains, higher crystallinity and more uniform crystal grain distribution, thereby being beneficial to the spatial structure arrangement of the carbon nano tube in a system. Secondly, the invention adopts the polypropylene antibacterial master batch, increases the dispersion effect of antibacterial components in the system, simultaneously leads the beta nucleating agent coated on the surface of the carbon nano tube to form beta crystal form polypropylene, takes the beta crystal form polypropylene as a medium, forms uniform space distribution by the inorganic nano antibacterial agent and the carbon nano tube in the antibacterial master batch, and solves the problems of conductivity and antibacterial property reduction caused by self aggregation and mutual aggregation of the carbon nano tube and the nano antibacterial agent after the carbon nano tube and the nano antibacterial agent are directly added.
3. According to the invention, the beta nucleating agent of the polypropylene is coated on the surface of the carbon nano tube, the beta nucleating agent induces the polypropylene component to form a beta crystal form, and under the synergistic effect of mineral oil, after the self-agglomeration and mutual agglomeration phenomena are avoided, the compatibility among the components is better, so that the antibacterial property and the electric conductivity of the material are more uniform, the performance of the TPE material is improved, the problem that the antibacterial property and the electric conductivity are difficult to be compatible is solved, and the antibacterial property and the electric conductivity of the TPE are improved.
4. According to the invention, the beta nucleating agent induces the polypropylene component to form the beta crystal form, so that the toughness of the polypropylene component is improved, meanwhile, the compatibility between the components is better, the carbon nano tube and the nano antibacterial agent are uniformly dispersed, and the problem of the mechanical property reduction of the TPE material caused by the incompatibility of the carbon nano tube and the nano antibacterial agent is avoided.
5. According to the invention, during preparation, the materials are divided into three components according to the form of the materials, and meanwhile, the materials are proportionally added into the double screw rods by adopting a weightless scale, so that the components are uniformly mixed to the greatest extent in proportion and form, the components of the materials are further uniform, and the performance of the materials is optimized.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are described in detail.
All of the following examples were used: the melt index of the SEBS rubber elastomer is 10g/10min, and the molecular weight is 30 ten thousand; the kinematic viscosity of the mineral oil at 40 ℃ is 48mm 2 S; the melt index of the polypropylene is 14g/10min, and the hardness is 85R; the melt index of the polypropylene antibacterial master batch is 6g/10min; the inorganic antibacterial agent in the polypropylene antibacterial master batch is a silver ion antibacterial agent; the carbon nanotubes are multi-wall carbon nanotubes with an average particle diameter of 50nm and an average length of 70 μm; the melt index of the SBS elastomer is 4g/10min, and the hardness is 66A; the filler is superfine calcium carbonate with the mesh number of 1000-1200; the mass ratio of the hindered phenol antioxidant and the phosphite antioxidant in the auxiliary agent is 2:1.
Example 1
The components and the content thereof are as follows: the raw material components in this example are shown in table 1.
TABLE 1
The preparation method comprises the following steps:
(1) Weighing raw material materials according to the proportion given in table 1;
(2) Surface treatment of carbon nanotubes: putting the carbon nano tube weighed in the step (1) into o-dichlorobenzene supersaturated solution of amide beta nucleating agent, performing ultrasonic dispersion for 3 hours, repeatedly washing with deionized water after suction filtration, thoroughly washing away o-dichlorobenzene solvent, and finally putting the washed carbon nano tube into a 90 ℃ oven for drying for 3 hours, wherein the dried product is the carbon nano tube with the beta nucleating agent coated on the surface;
(3) Adding the weighed SEBS rubber and SBS rubber in the step (1) into a stirring kettle, adding mineral oil, stirring for 5-7min to enable the mineral oil to be fully and uniformly absorbed by the rubber, and taking out for later use;
(4) Adding the weighed filler in the step (1), the modified carbon nano tube obtained in the step (2) and the auxiliary agent into a stirring kettle, stirring for 4min to fully disperse the materials, and taking out for later use;
(5) Adding the polypropylene and the polypropylene antibacterial master batch weighed in the step (1) into a stirring kettle, stirring for 4min, and taking out for standby after fully mixing;
(6) Feeding the mixed materials obtained in the steps (3), (4) and (5) into a double-screw extruder through a weight loss scale of 1#,2#,3# respectively, wherein the temperature of the region of the double-screw extruder is 170 ℃, 210 ℃, 230 ℃, 240 ℃, 230 ℃, 210 ℃, and 190 ℃ of the machine head temperature and the vacuum degree of-0.07 Mpa;
(7) And (3) sequentially carrying out bracing, water cooling, air cooling, granulating and packaging on the extruded material obtained in the step (6) to obtain the antibacterial conductive TPE material.
The pellets obtained above were injection molded into bars and then subjected to performance testing, and the results were shown in Table 2.
TABLE 2
Example 2
The components and the content thereof are as follows: the raw material components in this example are shown in Table 3.
TABLE 3 Table 3
| Raw material name | Parts by weight |
| SEBS rubber elastomer | 20 |
| Mineral oil | 13 |
| Polypropylene | 22 |
| Polypropylene antibacterial master batch | 5 |
| Carbon nanotubes | 20 |
| Packing material | 17 |
| SBS rubber elastomer | 3 |
| Auxiliary agent | 0.4 |
The preparation method comprises the following steps:
(1) Weighing raw material materials according to the proportion given in Table 3;
(2) Surface treatment of carbon nanotubes: putting the carbon nano tube weighed in the step (1) into o-dichlorobenzene supersaturated solution of amide beta nucleating agent, performing ultrasonic dispersion for 3 hours, repeatedly washing with deionized water after suction filtration, thoroughly washing away o-dichlorobenzene solvent, and finally putting the washed carbon nano tube into a 90 ℃ oven for drying for 3 hours, wherein the dried product is the carbon nano tube with the beta nucleating agent coated on the surface;
(3) Adding the weighed SEBS rubber and SBS rubber in the step (1) into a stirring kettle, adding mineral oil, stirring for 5-7min to enable the mineral oil to be fully and uniformly absorbed by the rubber, and taking out for later use;
(4) Adding the weighed filler in the step (1), the modified carbon nano tube obtained in the step (2) and the auxiliary agent into a stirring kettle, stirring for 4min to fully disperse the materials, and taking out for later use;
(5) Adding the polypropylene and the polypropylene antibacterial master batch weighed in the step (1) into a stirring kettle, stirring for 4min, and taking out for standby after fully mixing;
(6) Feeding the mixed materials obtained in the steps (3), (4) and (5) into a double-screw extruder through a weight loss scale of 1#,2#,3# respectively, wherein the temperature of the region of the double-screw extruder is 170 ℃, 210 ℃, 230 ℃, 240 ℃, 230 ℃, 210 ℃, and 190 ℃ of the machine head temperature and the vacuum degree of-0.06 Mpa;
(7) And (3) sequentially carrying out bracing, water cooling, air cooling, granulating and packaging on the extruded material obtained in the step (6) to obtain the antibacterial conductive TPE material.
The pellets obtained above were injection molded into bars and then subjected to performance test, and the results were shown in Table 4.
TABLE 4 Table 4
Example 3
The components and the content thereof are as follows: the raw material components in this example are shown in Table 5.
TABLE 5
The preparation method comprises the following steps:
(1) Weighing raw material materials according to the proportion given in Table 5;
(2) Surface treatment of carbon nanotubes: putting the carbon nano tube weighed in the step (1) into o-dichlorobenzene supersaturated solution of amide beta nucleating agent, performing ultrasonic dispersion for 3 hours, repeatedly washing with deionized water after suction filtration, thoroughly washing away o-dichlorobenzene solvent, and finally putting the washed carbon nano tube into a 90 ℃ oven for drying for 3 hours, wherein the dried product is the carbon nano tube with the beta nucleating agent coated on the surface;
(3) Adding the weighed SEBS rubber and SBS rubber in the step (1) into a stirring kettle, adding mineral oil, stirring for 5-7min to enable the mineral oil to be fully and uniformly absorbed by the rubber, and taking out for later use;
(4) Adding the weighed filler in the step (1), the modified carbon nano tube obtained in the step (2) and the auxiliary agent into a stirring kettle, stirring for 4min to fully disperse the materials, and taking out for later use;
(5) Adding the polypropylene and the polypropylene antibacterial master batch weighed in the step (1) into a stirring kettle, stirring for 4min, and taking out for standby after fully mixing;
(6) Feeding the mixed materials obtained in the steps (3), (4) and (5) into a double-screw extruder through a weight loss scale of 1#,2#,3# respectively, wherein the temperature of the region of the double-screw extruder is 170 ℃, 210 ℃, 230 ℃, 240 ℃, 230 ℃, 210 ℃, and 190 ℃ of the machine head temperature and the vacuum degree of-0.07 Mpa;
(7) And (3) sequentially carrying out bracing, water cooling, air cooling, granulating and packaging on the extruded material obtained in the step (6) to obtain the antibacterial conductive TPE material.
The pellets obtained above were injection molded into bars and then subjected to performance test, and the results are shown in Table 6.
TABLE 6
Example 4
The components and the content thereof are as follows: the raw material components in this example are shown in Table 7.
TABLE 7
| Raw material name | Parts by weight |
| SEBS rubber elastomer | 14 |
| Mineral oil | 16 |
| Polypropylene | 27 |
| Polypropylene antibacterial master batch | 10 |
| Carbon nanotubes | 10 |
| Packing material | 15 |
| SBS rubber elastomer | 8 |
| Auxiliary agent | 0.3 |
The preparation method comprises the following steps:
(1) Weighing raw material materials according to the proportion given in Table 7;
(2) Surface treatment of carbon nanotubes: putting the carbon nano tube weighed in the step (1) into o-dichlorobenzene supersaturated solution of amide beta nucleating agent, performing ultrasonic dispersion for 3 hours, repeatedly washing with deionized water after suction filtration, thoroughly washing away o-dichlorobenzene solvent, and finally putting the washed carbon nano tube into a 90 ℃ oven for drying for 3 hours, wherein the dried product is the carbon nano tube with the beta nucleating agent coated on the surface;
(3) Adding the weighed SEBS rubber and SBS rubber in the step (1) into a stirring kettle, adding mineral oil, stirring for 5-7min to enable the mineral oil to be fully and uniformly absorbed by the rubber, and taking out for later use;
(4) Adding the weighed filler in the step (1), the modified carbon nano tube obtained in the step (2) and the auxiliary agent into a stirring kettle, stirring for 4min to fully disperse the materials, and taking out for later use;
(5) Adding the polypropylene and the polypropylene antibacterial master batch weighed in the step (1) into a stirring kettle, stirring for 4min, and taking out for standby after fully mixing;
(6) Feeding the mixed materials obtained in the steps (3), (4) and (5) into a double-screw extruder through a weight loss scale of 1#,2#,3# respectively, wherein the temperature of the region of the double-screw extruder is 170 ℃, 210 ℃, 230 ℃, 240 ℃, 230 ℃, 210 ℃, and 190 ℃ of the machine head temperature and the vacuum degree of-0.05 Mpa;
(7) And (3) sequentially carrying out bracing, water cooling, air cooling, granulating and packaging on the extruded material obtained in the step (6) to obtain the antibacterial conductive TPE material.
The pellets obtained above were injection molded into bars and then subjected to performance test, and the results were shown in Table 8.
TABLE 8
Example 5
The components and the content thereof are as follows: the raw material components in this example are shown in Table 9.
TABLE 9
The preparation method comprises the following steps:
(1) Weighing raw material materials according to the proportion given in Table 9;
(2) Surface treatment of carbon nanotubes: putting the carbon nano tube weighed in the step (1) into o-dichlorobenzene supersaturated solution of amide beta nucleating agent, performing ultrasonic dispersion for 3 hours, repeatedly washing with deionized water after suction filtration, thoroughly washing away o-dichlorobenzene solvent, and finally putting the washed carbon nano tube into a 90 ℃ oven for drying for 3 hours, wherein the dried product is the carbon nano tube with the beta nucleating agent coated on the surface;
(3) Adding the weighed SEBS rubber and SBS rubber in the step (1) into a stirring kettle, adding mineral oil, stirring for 5-7min to enable the mineral oil to be fully and uniformly absorbed by the rubber, and taking out for later use;
(4) Adding the weighed filler in the step (1), the modified carbon nano tube obtained in the step (2) and the auxiliary agent into a stirring kettle, stirring for 4min to fully disperse the materials, and taking out for later use;
(5) Adding the polypropylene and the polypropylene antibacterial master batch weighed in the step (1) into a stirring kettle, stirring for 4min, and taking out for standby after fully mixing;
(6) Feeding the mixed materials obtained in the steps (3), (4) and (5) into a double-screw extruder through a weight loss scale of 1#,2#,3# respectively, wherein the temperature of the region of the double-screw extruder is 170 ℃, 210 ℃, 230 ℃, 240 ℃, 230 ℃, 210 ℃, and 190 ℃ of the machine head temperature and the vacuum degree of-0.06 Mpa;
(7) And (3) sequentially carrying out bracing, water cooling, air cooling, granulating and packaging on the extruded material obtained in the step (6) to obtain the antibacterial conductive TPE material.
The pellets obtained above were subjected to a performance test after injection molding into a sample, and the results are shown in Table 10.
Table 10
Comparative example 1
The components and the content thereof are as follows: the raw material composition in this example is shown in Table 11.
TABLE 11
| Raw material name | Parts by weight |
| SEBS rubber elastomer | 20 |
| Mineral oil | 20 |
| Polypropylene | 30 |
| Packing material | 22 |
| SBS rubber elastomer | 8 |
| Auxiliary agent | 0.3 |
The preparation method comprises the following steps:
(1) Weighing raw material materials according to the proportion given in Table 11;
(2) Adding the weighed SEBS rubber and SBS rubber in the step (1) into a stirring kettle, adding mineral oil, stirring for 5-7min to enable the mineral oil to be fully and uniformly absorbed by the rubber, and taking out for later use;
(3) Adding the weighed filler and the auxiliary agent in the step (1) into a stirring kettle, stirring for 4min to fully disperse the materials, and taking out for later use;
(4) Feeding the mixture obtained in the steps (2) and (3) and the polypropylene weighed in the step (1) into a double-screw extruder through a weight loss scale of No. 1, no. 2 and No. 3, wherein the temperature of the region of the double-screw extruder is 170 ℃, 210 ℃, 230 ℃, 240 ℃, 230 ℃, 210 ℃, 190 ℃ and 190 ℃ of a machine head, and the vacuum degree is-0.06 Mpa;
(5) And (3) sequentially carrying out bracing, water cooling, air cooling, granulating and packaging on the extruded material obtained in the step (4) to obtain the antibacterial conductive TPE material.
The pellets obtained above were subjected to a performance test after injection molding into a sample, and the results are shown in Table 12.
Table 12
As can be seen from the performance test results of the materials obtained in examples 1-5, namely tables 2, 4, 6, 8 and 10, the volume resistance of the material obtained in the invention is less than 100 omega, meanwhile, the antibacterial rate of the material is more than 94.3%, the highest antibacterial rate can be 98.9%, the material has better antibacterial property and conductivity, and as can be seen from the performance test table 12 of comparative example 1, the invention ensures the mechanical property of the TPE material, even the tensile strength of the TPE material can be improved by 20%, the elongation at break can be improved by 13%, and the material has excellent mechanical property.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (10)
1. The antibacterial conductive TPE material is characterized by comprising the following raw materials in parts by weight: 10-20 parts of SEBS rubber elastomer; 10-20 parts of mineral oil; 20-30 parts of polypropylene; 5-10 parts of polypropylene antibacterial master batch; 10-20 parts of carbon nano tubes; 15-25 parts of filler; 3-8 parts of SBS rubber elastomer; 0.2-0.5 part of auxiliary agent;
the carbon nano tube is subjected to surface treatment, the surface of the carbon nano tube is coated with a beta nucleating agent, and the beta nucleating agent coated on the surface of the carbon nano tube guides polypropylene and polypropylene antibacterial master batch to form beta crystal polypropylene, so that inorganic nano antibacterial agent and the carbon nano tube in the antibacterial master batch form uniform spatial distribution;
the antibacterial component of the polypropylene antibacterial master batch is a nano inorganic antibacterial agent, and the nano inorganic antibacterial agent is one or more of nano copper ions, nano zinc ions and nano silver ions.
2. The TPE material having antimicrobial electrical conductivity according to claim 1, wherein: the melt index of the SEBS rubber elastomer is 5-15g/10min, and the molecular weight is 29-32 ten thousand.
3. The TPE material having antimicrobial electrical conductivity according to claim 1, wherein: the kinematic viscosity of the mineral oil at 40 ℃ is 40-60mm 2 /s。
4. The TPE material having antimicrobial electrical conductivity according to claim 1, wherein: the melt index of the polypropylene is 10-20g/10min, and the hardness is 70-90R.
5. The TPE material having antimicrobial electrical conductivity according to claim 1, wherein: the melt index of the polypropylene antibacterial master batch is 1-10g/10min.
6. The TPE material having antimicrobial electrical conductivity according to claim 1, wherein: the particle size of the carbon nano tube is 1-70nm, the average length is 1-80 mu m, and the carbon nano tube is one or two of double-wall carbon nano tube and multi-wall carbon nano tube.
7. The TPE material having antimicrobial electrical conductivity according to claim 1, wherein: the filler is superfine calcium carbonate with the mesh number of 1000-1200;
the melt index of the SBS elastomer is 3-8g/10min, and the hardness is 60-80A.
8. The TPE material having antimicrobial electrical conductivity according to claim 1, wherein: the auxiliary agent comprises the effective components of hindered phenol antioxidants and phosphite antioxidants, wherein the mass ratio of the hindered phenol antioxidants to the phosphite antioxidants is 1-2:1, a step of;
the hindered phenol antioxidant is pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and the phosphite antioxidant is tris [2, 4-di-tert-butylphenyl ] phosphite.
9. A method of preparing a TPE material having antimicrobial electrical conductivity according to any one of claims 1-8, the method comprising the steps of:
(1) Weighing raw material materials according to a proportion;
(2) Surface treatment of carbon nanotubes: putting the carbon nano tube weighed in the step (1) into o-dichlorobenzene supersaturated solution of amide beta nucleating agent, performing ultrasonic dispersion, repeatedly washing with deionized water after suction filtration, thoroughly washing away o-dichlorobenzene solvent, and finally putting the washed carbon nano tube into an oven for drying, wherein the dried product is the carbon nano tube with the beta nucleating agent coated on the surface;
(3) Adding the weighed SEBS rubber and SBS rubber in the step (1) into a stirring kettle, adding mineral oil, stirring for 5-7min to enable the mineral oil to be fully and uniformly absorbed by the rubber, and taking out for later use;
(4) Adding the weighed filler in the step (1), the modified carbon nano tube obtained in the step (2) and the auxiliary agent into a stirring kettle, stirring for 3-5min to fully disperse the materials, and taking out for later use;
(5) Adding the polypropylene and the polypropylene antibacterial master batch weighed in the step (1) into a stirring kettle, stirring for 3-5min, and taking out for standby after fully mixing;
(6) Feeding the mixed materials obtained in the steps (3), (4) and (5) into a double-screw extruder through a No. 1, a No. 2 and a No. 3 weightlessness scale, wherein the extrusion temperature is 170-240 ℃;
(7) And (3) sequentially carrying out bracing, water cooling, air cooling, granulating and packaging on the extruded material obtained in the step (6) to obtain the antibacterial conductive TPE material.
10. The method for preparing the TPE material with antibacterial conductivity according to claim 9, wherein the method comprises the following steps: the ultrasonic dispersion time in the step (2) is 3 hours, the temperature of the oven is 90 ℃, and the drying time is 3 hours;
the temperature of the twin-screw extruder is 170 ℃, 210 ℃, 230 ℃, 240 ℃, 230 ℃, 210 ℃, the temperature of the machine head is 190 ℃ and the vacuum degree is-0.05 to-0.07 Mpa.
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