PVC material for medical operation knife wire and preparation method thereof

Abstract

The application discloses a PVC material for medical operation knife lines and a preparation method thereof, wherein the PVC material comprises, in mass fractions, 35-45 parts of polyvinyl chloride, 20-30 parts of a plasticizer, 3-6 parts of a stabilizer, 0.1-0.5 parts of a lubricant, 9-15 parts of insulating soil, 5-10 parts of a TPU elastomer, 2-5 parts of a processing aid and 0.2-1 parts of color powder; the molecular weight of the polyvinyl chloride is more than 100,000; the processing aid is methyl styrene resin M-80; and the plasticizer comprises polyester W-8000. The PVC material for medical operation knife lines has good flexibility, electrical insulation, temperature resistance, radiation resistance and chemical resistance, so that the medical operation knife lines prepared from the PVC material do not fade after being irradiated by gamma rays and wiped by alcohol, and the high-frequency and high-voltage performance of the medical operation knife lines can still reach more than 6000V and the maintaining time is more than 30s after being soaked in a 5% sodium chloride aqueous solution for 24 hours and naturally dried.

Description

Technical Field

[0001] The invention belongs to the technical field of medical surgical razor wires, and in particular relates to a PVC material for medical surgical razor wires and a preparation method thereof. Background Art

[0002] With the continuous advancement of medical technology, the safety, reliability, and performance requirements of surgical instruments are increasing. Among numerous surgical instruments, scalpel wire, as a key component for transmitting high-frequency, high-voltage electrical energy, plays a vital role in minimally invasive procedures. However, most scalpel wires currently on the market are made of polyvinyl chloride (PVC). While this material is relatively low-cost and easy to process, it has significant limitations under certain conditions.

[0003] First, existing PVC surgical filaments lack the ability to withstand high frequencies and high voltages. Specifically, after soaking in a 5% sodium chloride aqueous solution for 24 hours and drying, these materials can only maintain operation at voltages below 5600V for more than 30 seconds. Once the voltage exceeds this value, they are prone to breakdown, which not only affects surgical safety but can also directly interfere with the surgical process, increasing patient risk. Second, when PVC is exposed to a gamma-ray dose of 50kGy, it changes color, indicating that its internal structure has been damaged or modified to some extent, affecting its long-term stability and appearance. Furthermore, the discoloration also occurs after exposure to 105°C for 168 hours, demonstrating PVC's instability at higher temperatures. This means that the material's overall performance deteriorates after high-temperature sterilization, UV sterilization, or gamma-ray sterilization. Furthermore, from a production perspective, discoloration has been observed when freshly extruded PVC filament is cleaned with a dust-free cloth containing 75% alcohol. This indicates that the surface treatment process is flawed and may result in the final product failing to meet stringent medical device standards. In summary, the PVC surgical razor wire commonly used in the current market has problems such as limited pressure resistance, poor radiation resistance, chemical resistance and heat resistance, which limits its application scope in scenarios with higher requirements.

[0004] Therefore, there is an urgent need for a PVC material for medical surgical scalpel wire and a preparation method thereof to solve the deficiencies of the existing technical problems. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a PVC material for medical surgical scalpel wire and a preparation method thereof. The PVC material for medical surgical scalpel wire has good elastic feel, electrical insulation properties, temperature resistance, radiation resistance and chemical resistance. Therefore, the medical surgical scalpel wire made of this PVC material does not fade after gamma ray irradiation and alcohol wiping. Moreover, after being soaked in a 5% sodium chloride aqueous solution for 24 hours and naturally dried, the high-frequency and high-voltage resistance can still reach above 6000V and can be maintained for more than 30 seconds.

[0006] To achieve the above objectives, the first aspect of the present invention provides a PVC material for medical surgical scalpel wire, which includes, by mass, 35 to 45 parts of polyvinyl chloride, 20 to 30 parts of plasticizer, 3 to 6 parts of stabilizer, 0.1 to 0.5 parts of lubricant, 9 to 15 parts of insulating soil, 5 to 10 parts of TPU elastomer, 2 to 5 parts of processing aid, and 0.2 to 1 part of color powder; the molecular weight of the polyvinyl chloride is greater than 100,000, the processing aid is methyl styrene resin M-80, and the plasticizer includes polyester W-8000.

[0007] The PVC material for medical surgical scalpel wires of this invention utilizes polyvinyl chloride (PVC) with a molecular weight exceeding 100,000 as its primary material. Stabilizers, lubricants, and TPU elastomers are added to enhance the thermal stability, radiation resistance, and tolerance to various chemicals (such as alcohol) of the high-molecular-weight PVC. To enhance the appearance, color powder is also added to enhance the visual effect. However, PVC materials for medical surgical scalpel wires still suffer from poor processing performance, insufficient flexibility, and limited pressure resistance. Furthermore, poor processability of PVC also affects the uniform dispersion of color powder within the material. In order to solve the above problems, this application introduces insulating soil and polyester W-8000. Insulating soil can effectively improve the pressure resistance, but it is difficult to achieve uniform distribution of insulating soil in the PVC matrix, which may lead to inconsistent performance in local areas, thereby affecting the overall pressure resistance effect; while polyester W-8000 can be inserted between PVC molecular chains, increasing the distance between molecules, thereby making the PVC material more flexible. At the same time, since polyester W-8000 has strong polarity, it strengthens the interaction between it and the PVC molecules. This enhanced interaction can further improve the heat resistance and stability of the PVC material, especially when exposed to radiation. These strong interactions can help reduce chain breakage and the generation of free radicals, protecting PVC from chemical changes caused by radiation. However, this enhanced interaction will also cause the melt viscosity to increase, increasing the processing difficulty. Therefore, the present invention also uses methyl styrene resin M-80 as a processing aid. M-80 resin has surface active properties that can reduce the interfacial tension between the insulating soil and color powder and the PVC matrix, helping the insulating soil and color powder to better wet and disperse in the PVC. At the same time, M-80's high molecular weight enables it to form a network structure in the PVC matrix, helping to fix and disperse fine insulating soil and color powder particles, preventing them from agglomerating, thereby making the product surface smoother and more delicate and reducing discoloration caused by alcohol wiping during wire preparation. At the same time, this network structure also helps increase the fluidity of the PVC melt, thereby accelerating the plasticization process, and can capture free radicals generated by radiation, reducing damage to the PVC chain. In addition, M-80 resin can effectively reduce the high melt viscosity caused by polyester W-8000, making it easier to process and shape. In summary, the PVC material for medical surgical scalpel wire of the present invention has excellent flexibility, electrical insulation, temperature resistance, radiation resistance, and chemical resistance. Therefore, the medical surgical scalpel wire made of this PVC material does not fade after gamma ray irradiation and alcohol wiping. Moreover, after being soaked in a 5% sodium chloride aqueous solution for 24 hours and naturally dried, the high-frequency and high-voltage resistance performance can still reach above 6000V and can be maintained for more than 30 seconds.

[0008] Furthermore, the plasticizer of the present invention includes at least one of TOTM and DOTP. Both TOTM (tri(2-ethylhexyl) trimellitate) and DOTP (dioctyl terephthalate) can make PVC materials more flexible. Furthermore, both TOTM and DOTP have good lubricity and can significantly reduce the viscosity of the PVC melt. This can further alleviate the high viscosity problem caused by polyester W-8000, thereby further improving processability.

[0009] Furthermore, the molecular weight of the methyl styrene resin M-80 of the present invention is 590-1416.

[0010] Furthermore, the stabilizer of the present invention includes a calcium zinc stabilizer, an antioxidant and an auxiliary stabilizer, wherein the antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant, and the auxiliary stabilizer is epoxidized soybean oil.

[0011] Furthermore, the mass ratio of the calcium zinc stabilizer, antioxidant and auxiliary stabilizer of the present invention is 0.5-2:0.1-0.3:0.001-0.01.

[0012] Furthermore, the lubricant of the present invention includes at least one of high-density polyethylene wax and calcium stearate.

[0013] Furthermore, the insulating clay of the present invention is calcined kaolin. Kaolin is an excellent electrical insulating material. After calcination, it has higher purity and fewer impurities, further improving its electrical insulation performance and ensuring the reliability of PVC materials in electrical applications. Calcined kaolin also has excellent mechanical strength and hardness, significantly enhancing the pressure resistance of PVC materials, maintaining structural stability at high temperatures, and reducing thermal decomposition and degradation.

[0014] Furthermore, the color powder of the present invention is selected from at least one of titanium dioxide, iron oxide, ultramarine, phthalocyanine blue and permanent violet.

[0015] Accordingly, the second aspect of the present invention further provides a method for preparing a PVC material for medical surgical scalpel wire, comprising the following steps:

[0016] (1) mixing the formulated amounts of polyvinyl chloride, plasticizer, stabilizer, lubricant, and methyl styrene resin M-80 to obtain a first mixture;

[0017] (2) adding a formulated amount of insulating soil to the first mixture and stirring to obtain a second mixture;

[0018] (3) adding the formulated amount of TPU elastomer to the second mixture, stirring and mixing to obtain a third mixture;

[0019] (4) adding a formulated amount of color powder to the third mixture, stirring and mixing to obtain a fourth mixture;

[0020] (5) Extruding and granulating the fourth mixture to obtain a PVC material for medical surgical scalpel wire.

[0021] Compared with the prior art, the present invention first introduces methyl styrene resin M-80 into the first mixture, and utilizes the surface activity of M-80 to reduce the interfacial tension between the subsequently added insulating soil and color powder and the PVC matrix, thereby better wetting and dispersing these components; then, the insulating soil is added to better disperse it in the network structure formed by M-80, thereby improving the electrical insulation performance; finally, the color powder is added to ensure that it is evenly dispersed in the fourth mixture. The evenly dispersed color powder can be better fixed in the PVC matrix, avoiding discoloration caused by wiping alcohol and making the product surface smoother and more delicate, thereby improving the visual effect.

[0022] Furthermore, the stirring temperature in step (1) and step (3) of the present invention is both 100-130°C.

[0023] Furthermore, step (5) of the present invention further comprises extruding the fourth mixture into granules in a screw, wherein the melting temperature of the screw is 120-150°C. DETAILED DESCRIPTION

[0024] In order to better illustrate the purpose, technical solutions and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0025] The raw materials used in this example and comparative example are all commercially available. Specifically, polyvinyl chloride (PVC) with a molecular weight of approximately 110,000 was purchased from Ningbo Formosa Plastics Co., Ltd.; TPU elastomer was purchased from Bayer (U98AU20, Germany); calcined kaolin clay was purchased from Gaozhou Zhaoxiang Kaolin Co., Ltd., model PVCY-1; polyester W-8000 was purchased from Shenzhen Huahancheng Trading Development Co., Ltd.; methyl styrene resin M-80 was purchased from Wuxi Jiasheng High-tech Modified Materials Co., Ltd.; and high-density polyethylene wax was purchased from Honeywell (AC307A).

[0026] Example 1

[0027] This embodiment provides a PVC material for medical surgical scalpel wire, which includes, by mass, 40 parts of polyvinyl chloride, 28 parts of polyester W-8000, 4 parts of calcium zinc stabilizer, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.01 parts of epoxy soybean oil, 0.3 parts of high-density polyethylene wax, 11 parts of calcined kaolin, 8 parts of TPU elastomer, 3 parts of methyl styrene resin M-80, and 0.4 parts of titanium dioxide.

[0028] This embodiment also provides a method for preparing a PVC material for medical surgical scalpel wire, the steps comprising:

[0029] (1) adding the formulated amounts of polyvinyl chloride, calcium zinc stabilizer, antioxidant 1010, antioxidant 168, high-density polyethylene wax, methyl styrene resin M-80, polyester W-8000 and epoxy soybean oil in sequence while stirring, and stirring until the temperature reaches 120° C. to obtain a first mixture;

[0030] (2) adding the formulated amount of calcined kaolin to the first mixture and stirring uniformly to obtain a second mixture;

[0031] (3) adding the formulated amount of TPU elastomer to the second mixture and stirring until the temperature reaches 140° C. to obtain a third mixture;

[0032] (4) adding a formulated amount of color powder to the third mixture and stirring uniformly to obtain a fourth mixture;

[0033] (5) The fourth mixture is placed in an extruder and granulated by screw extrusion to obtain a PVC material for medical surgical scalpel wire; wherein the temperature of the screw is 120-150°C.

[0034] Example 2

[0035] This embodiment provides a PVC material for medical surgical scalpel wire, which includes, by mass, 35 parts of polyvinyl chloride, 25 parts of polyester W-8000, 5 parts of TOTM, 3 parts of calcium zinc stabilizer, 0.3 parts of antioxidant 1010, 0.1 parts of antioxidant 168, 0.02 parts of epoxy soybean oil, 0.2 parts of high-density polyethylene wax, 0.1 parts of calcium stearate, 13 parts of calcined kaolin, 6 parts of TPU elastomer, 4.5 parts of methyl styrene resin M-80, and 0.6 parts of titanium dioxide.

[0036] This embodiment also provides a method for preparing a PVC material for medical surgical scalpel wire, the steps comprising:

[0037] (1) adding the formulated amounts of polyvinyl chloride, calcium zinc stabilizer, antioxidant 1010, antioxidant 168, high-density polyethylene wax, calcium stearate, methyl styrene resin M-80, polyester W-8000, TOTM and epoxy soybean oil in sequence while stirring, and stirring until the temperature reaches 120° C. to obtain a first mixture;

[0038] (2) adding the formulated amount of calcined kaolin to the first mixture and stirring uniformly to obtain a second mixture;

[0039] (3) adding the formulated amount of TPU elastomer to the second mixture and stirring until the temperature reaches 140° C. to obtain a third mixture;

[0040] (4) adding a formulated amount of color powder to the third mixture and stirring uniformly to obtain a fourth mixture;

[0041] (5) The fourth mixture is placed in an extruder and granulated by screw extrusion to obtain a PVC material for medical surgical scalpel wire; wherein the temperature of the screw is 120-150°C.

[0042] Example 3

[0043] This embodiment provides a PVC material for medical surgical scalpel wire, which includes, by mass, 43 parts of polyvinyl chloride, 24 parts of polyester W-8000, 3 parts of DOTP, 5 parts of calcium zinc stabilizer, 0.5 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.03 parts of epoxidized soybean oil, 0.5 parts of high-density polyethylene wax, 14 parts of calcined kaolin, 7 parts of TPU elastomer, 4.8 parts of methyl styrene resin M-80, and 0.4 parts of titanium dioxide.

[0044] This embodiment also provides a method for preparing a PVC material for medical surgical scalpel wire, the steps comprising:

[0045] (1) adding the formulated amounts of polyvinyl chloride, calcium zinc stabilizer, antioxidant 1010, antioxidant 168, high-density polyethylene wax, calcium stearate, methyl styrene resin M-80, polyester W-8000, DOTP and epoxidized soybean oil in sequence while stirring, and stirring until the temperature reaches 120° C. to obtain a first mixture;

[0046] (2) adding the formulated amount of calcined kaolin to the first mixture and stirring uniformly to obtain a second mixture;

[0047] (3) adding the formulated amount of TPU elastomer to the second mixture and stirring until the temperature reaches 140° C. to obtain a third mixture;

[0048] (4) adding a formulated amount of color powder to the third mixture and stirring uniformly to obtain a fourth mixture;

[0049] (5) The fourth mixture is placed in an extruder and granulated by screw extrusion to obtain a PVC material for medical surgical scalpel wire; wherein the temperature of the screw is 120-150°C.

[0050] Comparative Example 1

[0051] This comparative example provides a PVC material for medical surgical scalpel wire, which includes, by mass, 40 parts of polyvinyl chloride, 28 parts of TOTM, 4 parts of calcium zinc stabilizer, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.01 parts of epoxy soybean oil, 0.3 parts of high-density polyethylene wax, 11 parts of calcined kaolin, 8 parts of TPU elastomer, 3 parts of methyl styrene resin M-80, and 0.4 parts of titanium dioxide.

[0052] This comparative example also provides a method for preparing a PVC material for medical surgical scalpel wire, comprising the following steps:

[0053] (1) adding the formulated amounts of polyvinyl chloride, calcium zinc stabilizer, antioxidant 1010, antioxidant 168, high-density polyethylene wax, methyl styrene resin M-80, TOTM, and epoxidized soybean oil in sequence while stirring, and stirring until the temperature reaches 120° C. to obtain a first mixture;

[0054] (2) adding the formulated amount of calcined kaolin to the first mixture and stirring uniformly to obtain a second mixture;

[0055] (3) adding the formulated amount of TPU elastomer to the second mixture and stirring until the temperature reaches 140° C. to obtain a third mixture;

[0056] (4) adding a formulated amount of color powder to the third mixture and stirring uniformly to obtain a fourth mixture;

[0057] (5) The fourth mixture is placed in an extruder and granulated by screw extrusion to obtain a PVC material for medical surgical scalpel wire; wherein the temperature of the screw is 120-150°C.

[0058] Comparative Example 2

[0059] This comparative example provides a PVC material for medical surgical scalpel wire, which includes, by mass, 40 parts of polyvinyl chloride, 28 parts of polyester W-8000, 4 parts of calcium zinc stabilizer, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.01 parts of epoxy soybean oil, 0.3 parts of high-density polyethylene wax, 11 parts of calcined kaolin, 8 parts of TPU elastomer, and 0.4 parts of titanium dioxide.

[0060] This comparative example also provides a method for preparing a PVC material for medical surgical scalpel wire, comprising the following steps:

[0061] (1) adding the formulated amounts of polyvinyl chloride, calcium zinc stabilizer, antioxidant 1010, antioxidant 168, high-density polyethylene wax, polyester W-8000, and epoxidized soybean oil in sequence while stirring, and stirring evenly until the temperature reaches 120° C. to obtain a first mixture;

[0062] (2) adding the formulated amount of calcined kaolin to the first mixture and stirring uniformly to obtain a second mixture;

[0063] (3) adding the formulated amount of TPU elastomer to the second mixture and stirring until the temperature reaches 140° C. to obtain a third mixture;

[0064] (4) adding a formulated amount of color powder to the third mixture and stirring uniformly to obtain a fourth mixture;

[0065] (5) The fourth mixture is placed in an extruder and granulated by screw extrusion to obtain a PVC material for medical surgical scalpel wire; wherein the temperature of the screw is 120-150°C.

[0066] Comparative Example 3

[0067] This comparative example provides a PVC material for medical surgical scalpel wire, which includes, by mass, 40 parts of polyvinyl chloride, 28 parts of polyester W-8000, 4 parts of calcium zinc stabilizer, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.01 parts of epoxy soybean oil, 0.3 parts of high-density polyethylene wax, 11 parts of calcined kaolin, 8 parts of TPU elastomer, 3 parts of acrylate copolymer ACR (purchased from Rohm and Haas Company, USA, model K-385), and 0.4 parts of titanium dioxide.

[0068] This comparative example also provides a method for preparing a PVC material for medical surgical scalpel wire, comprising the following steps:

[0069] (1) adding the formulated amounts of polyvinyl chloride, calcium zinc stabilizer, antioxidant 1010, antioxidant 168, high-density polyethylene wax, acrylate copolymer ACR, polyester W-8000, and epoxidized soybean oil in sequence while stirring, and stirring evenly until the temperature reaches 120° C. to obtain a first mixture;

[0070] (2) adding the formulated amount of calcined kaolin to the first mixture and stirring uniformly to obtain a second mixture;

[0071] (3) adding the formulated amount of TPU elastomer to the second mixture and stirring until the temperature reaches 140° C. to obtain a third mixture;

[0072] (4) adding a formulated amount of color powder to the third mixture and stirring uniformly to obtain a fourth mixture;

[0073] (5) The fourth mixture is placed in an extruder and granulated by screw extrusion to obtain a PVC material for medical surgical scalpel wire; wherein the temperature of the screw is 120-150°C.

[0074] The PVC materials for medical surgical scalpel wires of Examples 1 to 3 and Comparative Examples 1 to 3 were processed into medical surgical scalpel wires of the same specifications by an extruder at an extrusion temperature of 150 to 178° C. The performance of the medical surgical scalpel wires was tested according to the following test method. The test results are shown in Table 1.

[0075] Elasticity test: Refer to ASTM D412 and use a tensile testing machine to measure the tensile strength and elongation at break of medical surgical sutures.

[0076] Electrical insulation test: Refer to standard UL62 to test the insulation resistance of medical surgical knife wires. The reference standard for volume resistivity is GB / T 1410-2006.

[0077] Heat resistance test: Medical surgical scalpel wire was baked at 105°C for 168 hours and the color change was observed.

[0078] Radiation resistance test: Medical scalpel wire was sterilized in a medium-sized fixed gamma ray sterilizer (Nordion Gamma Cell 220) according to the conventional medical scalpel wire sterilization time and a sterilization dose of 50 kg / m3. The wire was then sterilized repeatedly for at least 10 times and the color change was observed.

[0079] Chemical (alcohol) resistance test: Use a dust-free cloth with 75% alcohol concentration to wipe the medical surgical scalpel thread repeatedly 20 times and observe whether there is any discoloration.

[0080] High-frequency, high-voltage resistance test: Medical scalpel wire was completely immersed in a 5% sodium chloride aqueous solution for 24 hours. After removal, it was naturally dried. Then, referring to ASTM D149-09 (2017), the medical scalpel wire was fixed between electrodes. A high-frequency, high-voltage generator was used to gradually increase the voltage to 6000V and maintain the voltage at 6000V. The number of seconds it took for the sample to breakdown (such as sparks, discharge sounds, etc.) at 6000V was observed and recorded.

[0081] Table 1 Performance test results

[0082]

[0083] By comparing Example 1 with Comparative Example 1, it can be seen that replacing polyester W-8000 with TOTM will affect the temperature resistance and radiation resistance of medical surgical scalpel wire. This is because although TOTM can also be interspersed between PVC molecular chains to increase the flexibility of the PVC material, the TOTM molecule is composed of non-polar long-chain alkyl groups and polar carboxylic acid ester groups. Although the ester group is polar, the entire molecule exhibits relatively low polarity due to the large number of hydrocarbon chains. This makes the interaction between TOTM and PVC molecules not strong, thereby affecting the heat resistance and radiation resistance of the PVC material.

[0084] By comparing Example 1 with Comparative Example 3, it can be seen that replacing the methyl styrene resin M-80 with the acrylic acid ester copolymer ACR, although the acrylic acid ester copolymer ACR can also improve the melt strength and fluidity, it cannot effectively reduce the interfacial tension between the insulating soil and color powder and the PVC matrix, nor can it form a network structure in the PVC matrix, and further cannot fix and disperse the fine insulating soil and color powder particles.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A PVC material for medical surgical scalpel wire, characterized in that: Calculated by mass, it includes 35 to 45 parts of polyvinyl chloride, 20 to 30 parts of plasticizer, 3 to 6 parts of stabilizer, 0.1 to 0.5 parts of lubricant, 9 to 15 parts of insulating soil, 5 to 10 parts of TPU elastomer, 2 to 5 parts of processing aid, and 0.2 to 1 part of color powder; the molecular weight of the polyvinyl chloride is more than 100,000, the processing aid is methyl styrene resin M-80, and the plasticizer includes polyester W-8000.

2. The PVC material for medical surgical scalpel wire according to claim 1, characterized in that: The plasticizer further comprises at least one of TOTM and DOTP.

3. The PVC material for medical surgical scalpel wire according to claim 1, characterized in that: The stabilizer comprises a calcium zinc stabilizer, an antioxidant and an auxiliary stabilizer. The antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant. The auxiliary stabilizer is epoxidized soybean oil.

4. The PVC material for medical surgical scalpel wire according to claim 3, characterized in that: The mass ratio of the calcium zinc stabilizer, the antioxidant and the auxiliary stabilizer is 0.5-2:0.1-0.3:0.001-0.

01.

5. The PVC material for medical surgical scalpel wire according to claim 1, characterized in that: The lubricant includes at least one of high-density polyethylene wax and calcium stearate.

6. The PVC material for medical surgical scalpel wire according to claim 1, characterized in that: The insulating soil is calcined kaolin.

7. The PVC material for medical surgical scalpel wire according to claim 1, characterized in that: The color powder is selected from at least one of titanium dioxide, iron oxide, ultramarine, phthalocyanine blue and permanent violet.

8. The method for preparing PVC material for medical surgical scalpel wire according to any one of claims 1 to 7, characterized in that the steps include: (1) mixing the formulated amounts of polyvinyl chloride, plasticizer, stabilizer, lubricant, and methyl styrene resin M-80 to obtain a first mixture; (2) adding a formulated amount of insulating soil to the first mixture, and stirring and mixing to obtain a second mixture; (3) adding a formulated amount of TPU elastomer to the second mixture, stirring and mixing to obtain a third mixture; (4) adding a formulated amount of color powder to the third mixture, stirring and mixing to obtain a fourth mixture; (5) Extruding and granulating the fourth mixture to obtain a PVC material for medical surgical scalpel wire.

9. The method for preparing the PVC material for medical surgical scalpel wire according to claim 8, wherein: The stirring temperature in step (1) and step (3) is both 100-130°C.

10. The method for preparing the PVC material for medical surgical scalpel wire according to claim 9, wherein: Step (5) further comprises extruding the fourth mixture into granules in a screw, wherein the temperature of the screw is 120-150°C.

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