PVC (polyvinyl chloride) material for medical scalpel line and preparation method thereof

Abstract

The invention discloses a PVC (polyvinyl chloride) material for medical scalpel lines and a preparation method thereof, and the PVC material comprises the following components in parts by mass: 35-45 parts of polyvinyl chloride, 20-30 parts of plasticizer, 3-6 parts of stabilizer, 0.1-0.5 part of lubricant, 9-15 parts of insulating soil, 5-10 parts of TPU (thermoplastic polyurethane) elastomer, 2-5 parts of processing aid and 0.2-1 part of toner. 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 the medical surgical knife line has good flexibility, electrical insulating property, temperature resistance, irradiation resistance and chemical resistance, so that the medical surgical knife line prepared from the PVC material does not fade after being irradiated by gamma rays and wiped by alcohol; and the high-frequency and high-voltage resistance can still reach more than 6000 V after being soaked in a 5% sodium chloride aqueous solution for 24 h and naturally aired, and the holding time exceeds 30 s.

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 development of medical technology, the safety, reliability and performance requirements of surgical instruments are increasing. Among many surgical instruments, surgical wires, as key components for transmitting high-frequency and high-voltage electrical energy, play an important role in minimally invasive surgery and other processes. However, most surgical wires on the market are made of polyvinyl chloride (PVC). Although this type of material is relatively low in cost and easy to process, it has the following obvious limitations under certain conditions.

[0003] First, the surgical knife wire made of existing PVC materials is not good at resisting high frequency and high voltage. Specifically, after being soaked in 5% sodium chloride aqueous solution for 24 hours and dried, these materials can only maintain a working state of more than 30 seconds under a voltage environment below 5600V. Once the voltage exceeds this value, it is easy to break down, which not only affects the safety of surgical operations, but also may directly interfere with the surgical process and increase patient risks. Secondly, when the PVC material is irradiated with a dose of 50kGy of gamma rays, the color changes, which indicates that the internal structure of the material has been damaged or modified to a certain extent, thus affecting its long-term stability and appearance quality; in addition, when the material is in a high temperature environment of 105℃ for 168 hours, the color changes, which shows the instability of PVC under higher temperature conditions, that is, the comprehensive performance of the material will also decrease after high temperature disinfection or ultraviolet disinfection or gamma ray sterilization. Furthermore, from a production perspective, when the freshly extruded PVC wire is cleaned with a dust-free cloth with a concentration of 75% alcohol, discoloration is found, which reflects that there are still defects in the surface treatment process of the material, which may cause the final product to not meet the strict medical equipment standards. In summary, the PVC surgical blades commonly used in the current market have problems such as limited pressure resistance, poor radiation resistance, chemical resistance and heat resistance, which limit their application scope in scenarios with higher requirements.

[0004] Therefore, there is an urgent need for a PVC material for medical surgical knife 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 performance, temperature resistance, radiation resistance and chemical resistance. Therefore, the medical surgical scalpel wire made of the PVC material does not fade after γ-ray irradiation and alcohol wiping, and 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 more than 6000V and the maintenance time exceeds 30s.

[0006] To achieve the above objectives, the first aspect of the present invention provides a PVC material for medical surgical knife 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 polyvinyl chloride is more 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 knife wire of the present invention uses polyvinyl chloride (PVC) with a molecular weight of more than 100,000 as the main material, and adds stabilizers, lubricants, and TPU elastomers to improve the thermal stability, radiation resistance, and good tolerance to various chemicals (such as alcohol) of high molecular weight PVC. In order to improve the appearance, color powder is also added to enhance the visual effect. However, for the PVC material for medical surgical knife wire, there are still problems such as poor processing performance, insufficient flexibility, and limited pressure resistance, and when the PVC processability is poor, it also affects the uniform dispersion of the color powder in the material. In order to solve the above problems, the present application introduces insulating soil and polyester W-8000, wherein the insulating soil can effectively improve the pressure resistance, but the insulating soil is difficult to achieve uniform distribution 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 to increase the distance between molecules, thereby making the PVC material more flexible. At the same time, since polyester W-8000 has a 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 difficulty of processing. Therefore, the present invention also uses methyl styrene resin M-80 as a processing aid. M-80 resin has surface active properties, which can reduce the interfacial tension between the insulating soil and the color powder and the PVC matrix, and help the insulating soil and the color powder to be better wetted and dispersed in the PVC. At the same time, the large molecular weight of M-80 enables it to form a network structure in the PVC matrix, which helps to fix and disperse the fine insulating soil and color powder particles, prevent them from aggregating, and thus make the product surface smoother and more delicate and reduce the discoloration caused by alcohol wiping when preparing the wire. At the same time, the network structure also helps to increase the fluidity of the PVC melt, thereby accelerating the plasticization process, and can capture the free radicals generated by radiation, reducing the damage to the PVC chain; in addition, M-80 resin can also effectively reduce the high melt viscosity caused by polyester W-8000, so that it is easier to process and shape. In summary, the PVC material for medical surgical knife wire of the present invention has good flexibility, electrical insulation, temperature resistance, radiation resistance and chemical resistance. Therefore, the medical surgical knife wire made of the PVC material does not fade after γ-ray irradiation and alcohol wiping, and after being soaked in 5% sodium chloride aqueous solution for 24 hours and naturally dried, the high-frequency and high-voltage resistance performance can still reach more than 6000V and the maintenance time exceeds 30s.

[0008] Furthermore, the plasticizer of the present invention also includes at least one of TOTM and DOTP. Both TOTM (tri(2-ethylhexyl) trimellitate) and DOTP (dioctyl terephthalate) can make the PVC material more flexible, and both TOTM and DOTP have good lubricity and can significantly reduce the viscosity of the PVC melt, which can further alleviate the high viscosity problem caused by polyester W-8000, thereby further improving the 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 comprises 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, the antioxidant and the 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 soil of the present invention is calcined kaolin. Kaolin is an excellent electrical insulating material. After calcination, it has higher purity and fewer impurities, thereby further improving the electrical insulation performance and ensuring the reliability of PVC materials in electrical applications; moreover, calcined kaolin also has good mechanical strength and hardness, significantly enhancing the pressure resistance of PVC materials, and can maintain structural stability at high temperatures, 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 also provides a method for preparing a PVC material for medical surgical scalpel wire, the steps comprising:

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

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

[0018] (3) adding a 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 characteristics of M-80 to reduce the interfacial tension between the insulating soil and color powder added subsequently and the PVC matrix, so as to better wet and disperse these components; then the insulating soil is added so that it can be better dispersed 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, and the evenly dispersed color powder can be better fixed in the PVC matrix, thereby avoiding the color fading phenomenon caused by wiping alcohol and making the product surface smoother and more delicate, thereby improving the visual effect.

[0022] Furthermore, the stirring temperatures in step (1) and step (3) of the present invention are 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 scheme 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 involved in this embodiment and comparative example can all be obtained from the market. More specifically, the molecular weight of polyvinyl chloride is about 110,000, purchased from Ningbo Formosa Plastics Co., Ltd.; TPU elastomer is purchased from Bayer U98AU20 in Germany; calcined kaolin is purchased from Gaozhou Zhaoxiang Kaolin Co., Ltd., model PVCY-1; polyester W-8000 is purchased from Shenzhen Huahancheng Trade Development Co., Ltd.; methyl styrene resin M-80 is purchased from Wuxi Jiasheng High-tech Modified Materials Co., Ltd.; high-density polyethylene wax is purchased from Honeywell AC307A.

[0026] Example 1

[0027] The present 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 a medical surgical knife 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 evenly until the temperature reaches 120° C. to obtain a first mixture;

[0030] (2) adding a formulated amount of calcined kaolin to the first mixture and stirring evenly 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) placing the fourth mixture in an extruder and extruding it into granules through a screw to obtain a PVC material for medical surgical knife wire; wherein the temperature of the screw is 120-150° C.

[0034] Example 2

[0035] The present 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 a medical surgical knife 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 evenly until the temperature reaches 120° C. to obtain a first mixture;

[0038] (2) adding a formulated amount of calcined kaolin to the first mixture and stirring evenly 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) placing the fourth mixture in an extruder and extruding it into granules through a screw to obtain a PVC material for medical surgical knife wire; wherein the temperature of the screw is 120-150° C.

[0042] Example 3

[0043] The present 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 epoxy 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 a medical surgical knife 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 evenly until the temperature reaches 120° C. to obtain a first mixture;

[0046] (2) adding a formulated amount of calcined kaolin to the first mixture and stirring evenly 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) placing the fourth mixture in an extruder and extruding it into granules through a screw to obtain a PVC material for medical surgical knife wire; wherein the temperature of the screw is 120-150° C.

[0050] Comparative Example 1

[0051] The 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 knife wire, the steps comprising:

[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 epoxy soybean oil in sequence while stirring, and stirring evenly until the temperature reaches 120° C. to obtain a first mixture;

[0054] (2) adding a formulated amount of calcined kaolin to the first mixture and stirring evenly 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) placing the fourth mixture in an extruder and extruding it into granules through a screw to obtain a PVC material for medical surgical knife wire; wherein the temperature of the screw is 120-150° C.

[0058] Comparative Example 2

[0059] The 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 knife wire, the steps comprising:

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

[0062] (2) adding a formulated amount of calcined kaolin to the first mixture and stirring evenly 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) placing the fourth mixture in an extruder and extruding it into granules through a screw to obtain a PVC material for medical surgical knife wire; wherein the temperature of the screw is 120-150° C.

[0066] Comparative Example 3

[0067] The 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 of the United States, 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 knife wire, the steps comprising:

[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 a formulated amount of calcined kaolin to the first mixture and stirring evenly 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) placing the fourth mixture in an extruder and extruding it into granules through a screw to obtain a PVC material for medical surgical knife wire; wherein the temperature of the screw is 120-150° C.

[0074] The PVC materials for medical surgical knife wires of Examples 1 to 3 and Comparative Examples 1 to 3 were processed into medical surgical knife wires of the same specification by an extruder, and the extrusion temperature was 150 to 178° C. The performance of the medical surgical knife wires was tested according to the following test method, and 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 knife wire.

[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] Temperature resistance test: The medical surgical knife wire was placed in a high temperature environment of 105°C and baked for 168 hours, and the color change was observed.

[0078] Radiation resistance test: Place the medical scalpel wire in a medium-sized fixed gamma ray sterilizer (Nordion Gamma Cell 220) and sterilize it according to the conventional medical scalpel wire sterilization time, the sterilization dose is 50KGY, and then sterilize it repeatedly for at least 10 times, and observe the color change.

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

[0080] High-frequency and high-voltage resistance test: The medical surgical knife wire is completely immersed in a 5% sodium chloride aqueous solution for 24 hours, taken out and dried naturally, and then, referring to ASTM D149-09 (2017), the medical surgical knife wire is fixed between the electrodes, and a high-frequency and high-voltage generator is used to gradually increase the voltage to 6000V, and the voltage is maintained at 6000V. Observe and record how many seconds the sample will last under the voltage of 6000V before breakdown occurs (such as sparks, discharge sounds, etc.).

[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 the medical surgical knife line. 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 and polar carboxylic acid ester groups. Although the ester group is polar, the entire molecule shows relatively low polarity due to containing a large number of hydrocarbon chains, which makes the interaction between it and the 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 ester copolymer ACR, although the acrylic 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 solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A PVC material for medical surgical knife wire, characterized in that: The invention comprises, by weight, 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 comprises polyester W-8000.

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

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

7. The PVC material for medical surgical knife 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 the PVC material for medical surgical knife 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 uniformly 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 toner 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 knife wire according to claim 8, characterized in that: The stirring temperatures in step (1) and step (3) are both 100-130°C.

10. The method for preparing the PVC material for medical surgical knife wire according to claim 9, characterized in that: 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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