Stainless steel wire braided sleeve and preparation method thereof

Abstract

The invention relates to the field of medical instrument protection materials, and particularly discloses a stainless steel wire braided sleeve and a preparation method thereof. The stainless steel wire woven sleeve comprises stainless steel wires and an inner layer material, the stainless steel wires are woven to form a stainless steel wire woven mesh sleeve, the inner layer material is inserted into the stainless steel wire woven mesh sleeve and is one of a plastic pipe and a rubber pipe, and the inner portion and the outer portion of the stainless steel wire woven sleeve are both coated with corrosion-resistant coatings. The corrosion-resistant coating is prepared from the following raw materials in parts by weight: 100 to 120 parts of polytetrafluoroethylene, 20 to 30 parts of reinforced resin, 10 to 20 parts of nano filler, 10 to 20 parts of fiber filler, 3 to 5 parts of dispersing agent and 3 to 5 parts of coupling agent; according to the stainless steel wire sleeve, the inner layer material, the stainless steel wire woven mesh sleeve and the corrosion-resistant coating are combined, the prepared stainless steel wire sleeve has good strength, wear resistance and corrosion resistance, and the instrument and the sleeve can be well protected.

Description

Technical Field

[0001] The present application relates to the field of medical device protective materials, and in particular to a stainless steel wire braided sleeve and a preparation method thereof. Background Art

[0002] In the medical field, many medical equipment and instruments, such as connecting wires and catheters of various precision instruments, need to use stainless steel wire braided sleeves to prevent them from being physically damaged by the outside world, such as collision and extrusion, and to extend the service life of equipment components. Traditional sleeves used to protect medical equipment and instruments are mainly plastic sleeves and rubber sleeves.

[0003] However, plastic sleeves have limited corrosion resistance and may degrade or deform when in contact with certain medical chemical reagents for a long time. They are easily scratched or worn by sharp objects, which affects their service life. Rubber sleeves have limited heat resistance and may age or lose elasticity during high-temperature disinfection or in specific environments. They are prone to absorbing dust and pollutants, have poor air permeability, are difficult to clean, and may cause bacterial growth, posing a potential threat to the health of patients and medical staff. Summary of the invention

[0004] In order to improve the strength and protective performance of the stainless steel wire cannula while maintaining a certain flexibility for flexible use in medical operations, the present application provides a stainless steel wire braided cannula and a preparation method thereof.

[0005] In a first aspect, the present application provides a stainless steel wire braided sleeve, which adopts the following technical solution: A stainless steel wire braided sleeve comprises stainless steel wire and an inner layer material, wherein the stainless steel wire is woven to form a stainless steel wire braided mesh sleeve, the inner layer material is inserted into the stainless steel wire braided mesh sleeve, the inner layer material is one of a plastic tube and a rubber tube, and the stainless steel wire braided sleeve is coated with a corrosion-resistant coating both inside and outside, wherein the corrosion-resistant coating comprises the following raw materials in parts by weight: 100-120 parts of polytetrafluoroethylene, 20-30 parts of reinforcing resin, 10-20 parts of nano filler, 10-20 parts of fiber filler, 3-5 parts of dispersant, and 3-5 parts of coupling agent.

[0006] By adopting the above technical solution, using stainless steel wire and weaving it into a mesh sleeve, it can be ensured that the sleeve has good strength and protective effect. Connecting the inner layer material with the stainless steel wire braided mesh sleeve can improve the strength, high temperature resistance and wear resistance of the stainless steel wire braided sleeve.

[0007] The stainless steel wire braided sleeve is coated with a corrosion-resistant coating both inside and outside. The use of polytetrafluoroethylene can improve the chemical corrosion resistance and lubrication performance of the stainless steel wire braided sleeve, reduce the corrosion effect of corrosive substances on the sleeve, and extend the service life of the sleeve. At the same time, better lubricity can reduce the friction of the instrument during use and protect the instrument and the sleeve.

[0008] Preferably, the reinforcing resin is at least one of phenolic epoxy resin, acrylic resin, and polyamide-imide.

[0009] By adopting the above technical solution, phenolic epoxy resin, acrylic resin, polyamide-imide can be combined with components such as polytetrafluoroethylene to form a stronger composite coating, thereby improving the strength and chemical stability of the coating.

[0010] Preferably, the polytetrafluoroethylene is irradiated in advance.

[0011] By adopting the above technical scheme, polytetrafluoroethylene is irradiated in advance, and a large number of free radicals are generated in the polytetrafluoroethylene, which can improve the interfacial bonding strength of the polytetrafluoroethylene surface, promote the bonding strength of polytetrafluoroethylene and reinforcing resin, and enable phenolic epoxy resin, acrylic resin, and polyamide-imide to cross-link and bond on the surface of polytetrafluoroethylene, thereby improving the corrosion resistance and strength of the coating and extending the service life of the casing.

[0012] Preferably, the nanofiller is at least one of nano silicon nitride, nano silicon dioxide and silicon carbide.

[0013] By adopting the above technical solutions, the extremely small size of the nanofiller can fill the tiny gaps in the coating, forming a denser structure and improving the density of the coating on the casing surface. Nano silicon nitride and silicon carbide have high hardness and good chemical stability, which can improve the wear resistance and corrosion resistance of the casing. Nano silicon dioxide has a high specific surface area and good dispersibility, which can enhance the density and mechanical strength of the coating, while providing good thermal stability and chemical stability.

[0014] Preferably, the nanofiller is pre-treated with a coupling agent for surface modification.

[0015] By adopting the above technical scheme, the coupling agent is used to modify the surface of the nanofiller, which can cause a relatively rough film to adhere to the surface of the nanofiller, increase the gap between the nanofiller particles, and increase the contact area between the nanofiller and the coating, which is beneficial to the meshing of the nanofiller and the coating, and increases the bonding force between the two, thereby improving the dispersion and uniformity of the nanofiller in the coating system, thereby improving the wear resistance, strength and hardness of the casing.

[0016] Preferably, the stainless steel wire is one of 304, 316, and 316L stainless steel wires, and the diameter of the stainless steel wire is 0.1-0.5 mm.

[0017] By adopting the above technical solution, 304, 316, and 316L stainless steel wires have good corrosion resistance and biocompatibility, and the stainless steel wire with a diameter of 0.1-0.5 mm has good flexibility and strength.

[0018] Preferably, the stainless steel wire is woven into multiple strands, and the weaving structure is one of plain weave, twill weave and satin weave. The weaving angle of the stainless steel wire is 45-60°.

[0019] By adopting the above technical scheme, by adjusting the weaving method and weaving angle of the stainless steel wire, the connectivity and flexibility of the stainless steel wire can be enhanced, so that the prepared stainless steel wire woven mesh can have both good strength and flexibility, and at the same time can also enable the protected medical device to have better heat dissipation and moisture dissipation effects, and have better stability and reliability.

[0020] In a second aspect, the present application provides a method for preparing a stainless steel wire braided sleeve, which adopts the following technical solution: A method for preparing a stainless steel wire braided sleeve, comprising the following specific steps: The stainless steel wire is cleaned and then braided to form a stainless steel wire braided mesh sleeve, the braided stainless steel wire braided mesh sleeve is ultrasonically cleaned at a cleaning temperature of 40-60°C, an inner layer material is inserted into the stainless steel wire braided mesh sleeve, and pressed and connected at a pressure of 500-1000MPa to obtain a semi-finished casing, polytetrafluoroethylene, reinforcing resin, nanofiller, fiber filler, dispersant and coupling agent are mixed to obtain a mixture, the mixture is coated on the inner and outer sides of the semi-finished casing, and the stainless steel wire braided casing is dried at 90-100°C to obtain the stainless steel wire braided casing.

[0021] By adopting the above technical solution, the woven stainless steel wire braided mesh sleeve is first ultrasonically cleaned to remove the oil, impurities and other components that may remain in the braiding process. Under a pressure of 500-1000MPa, the inner layer material and the stainless steel wire braided mesh sleeve are tightly bonded, which can improve the strength, high temperature resistance, corrosion resistance and wear resistance of the sleeve, extend the service life of the sleeve, and better protect the medical device.

[0022] Preferably, the stainless steel wire braided mesh sleeve is pre-passivated, and then the inner layer material is inserted into the stainless steel wire braided mesh sleeve, the passivation treatment temperature is 40-60° C., and the passivation treatment time is 20-30 min.

[0023] By adopting the above technical solution and performing segment sliding treatment on the stainless steel wire braided mesh sleeve, the corrosion resistance of the stainless steel wire braided mesh sleeve can be improved.

[0024] In summary, this application has the following beneficial effects: 1. Since the present application uses stainless steel wire and weaves it into a mesh sleeve, and then connects the inner layer material with the stainless steel wire braided mesh sleeve, it can ensure that the sleeve has both good strength and flexibility, and has a better protective effect on medical devices. The stainless steel wire braided sleeve is coated with a corrosion-resistant coating inside and outside, and polytetrafluoroethylene can improve the chemical corrosion resistance and lubrication performance of the stainless steel wire braided sleeve, extending the service life of the sleeve.

[0025] 2. In this application, the inner layer material and the stainless steel wire braided mesh sleeve are tightly bonded under a pressure of 500-1000MPa, which can make the sleeve have good strength and flexibility. The braiding method and braiding angle of the stainless steel wire are adjusted to enhance the strength and flexibility of the stainless steel wire braided mesh sleeve, improve the strength, high temperature resistance, corrosion resistance and wear resistance of the sleeve, extend the service life of the sleeve, and better protect the medical device. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with embodiments.

[0027] All raw materials in the examples are commercially available. Example

[0028] Example 1 The present embodiment provides a stainless steel wire braided sleeve, comprising stainless steel wire and inner layer material, the stainless steel wire is 304 type stainless steel wire, the stainless steel wire diameter is 0.3mm, the stainless steel wire is braided to form a stainless steel wire braided mesh sleeve, the inner layer material is inserted into the stainless steel wire braided mesh sleeve, the inner layer material is a PVC plastic tube, the stainless steel wire braided sleeve is coated with a corrosion-resistant coating inside and outside, and the corrosion-resistant coating comprises the following raw materials in parts by weight: 110g of polytetrafluoroethylene, 25g of reinforcing resin, 15g of nanofiller, 15g of fiber filler, 4g of dispersant, and 4g of coupling agent. The reinforcing resin is phenolic epoxy resin, the CAS number of the phenolic epoxy resin is 9003-36-5, the CAS number of polytetrafluoroethylene is 9002-84-0, the nanofiller is nano silicon nitride, the average particle size of the nanofiller is 50-100nm, the fiber filler is a conventional fiber filler, and the present embodiment uses carbon fiber, the dispersant is N-aminoformylmethyl ethanesulfonic acid, and the coupling agent is KH-570.

[0029] The preparation method of the stainless steel wire braided sleeve comprises the following specific steps: The stainless steel wire is cleaned and then braided, and a double-strand twill braid with a braiding angle of 45° is used to make a stainless steel wire braided mesh sleeve. The stainless steel wire braided mesh sleeve is ultrasonically cleaned at a cleaning temperature of 50°C and a ultrasonic cleaning time of 15 minutes. The inner layer material is then inserted into the stainless steel wire braided mesh sleeve, and pressed at a pressure of 800 MPa for 10 minutes to obtain a semi-finished sleeve. Polytetrafluoroethylene, reinforcing resin, nanofiller, fiber filler, dispersant and coupling agent are mixed and stirred to obtain a mixture. The mixture is coated on both sides of the inner and outer sides of the semi-finished sleeve, and after drying at 95°C, a coating with an average thickness of 1 μm is formed to obtain a stainless steel wire braided sleeve.

[0030] Example 2 The difference between Example 2 and Example 1 is that the amount of polytetrafluoroethylene used in the corrosion-resistant coating raw material is 100g, the amount of reinforcing resin used is 30g, the amount of nanofiller used is 10g, the amount of fiber filler used is 10g, the amount of dispersant used is 5g, and the amount of coupling agent used is 3g.

[0031] Example 3 The difference between Example 3 and Example 1 is that the amount of polytetrafluoroethylene used in the corrosion-resistant coating raw material is 120g, the amount of reinforcing resin used is 20g, the amount of nanofiller used is 20g, the amount of fiber filler used is 20g, the amount of dispersant used is 3g, and the amount of coupling agent used is 5g.

[0032] Example 4 The difference between Example 4 and Example 1 is that the reinforcing resin in the raw material of the corrosion-resistant coating is a mixture of polyamideimide and acrylic resin, and the mass ratio of polyamideimide to acrylic resin is 1:1.

[0033] Example 5 The difference between Example 5 and Example 4 is that the nanofiller in the corrosion-resistant coating raw material is a mixture of nano silicon nitride, nano silicon dioxide, and silicon carbide, and the mass ratio of nano silicon nitride, nano silicon dioxide, and silicon carbide is 1:1:1.

[0034] Example 6 The difference between Example 6 and Example 5 is that the polytetrafluoroethylene is irradiated in advance.

[0035] The preparation method of the stainless steel wire braided sleeve comprises the following specific steps: S1: The stainless steel wire is cleaned and then braided, and a double-strand twill weave with a weaving angle of 45° is used to make a stainless steel wire braided mesh sleeve. The stainless steel wire braided mesh sleeve is ultrasonically cleaned at a cleaning temperature of 50°C for 15 minutes, and then the inner layer material is inserted into the stainless steel wire braided mesh sleeve, and pressed at a pressure of 800 MPa for 10 minutes to obtain a semi-finished sleeve.

[0036] S2: irradiate polytetrafluoroethylene in a vacuum state, with a radiation voltage of 0.5MV, a radiation beam current of 15mA, and a vehicle speed of 30m / min, mix the irradiated polytetrafluoroethylene, reinforcing resin, nanofiller, fiber filler, dispersant and coupling agent, stir evenly to obtain a mixture, apply the mixture on both sides of the inner and outer sides of the semi-finished casing, and after drying at 95°C, form a coating with an average thickness of 1μm to obtain a stainless steel wire braided casing.

[0037] Example 7 The difference between Example 7 and Example 6 is that the nanofiller is preliminarily subjected to surface modification treatment with a coupling agent.

[0038] The preparation method of the stainless steel wire braided sleeve comprises the following specific steps: S1: The stainless steel wire is cleaned and then braided, and a double-strand twill weave with a weaving angle of 45° is used to make a stainless steel wire braided mesh sleeve. The stainless steel wire braided mesh sleeve is ultrasonically cleaned at a cleaning temperature of 50°C for 15 minutes, and then the inner layer material is inserted into the stainless steel wire braided mesh sleeve, and pressed at a pressure of 800 MPa for 10 minutes to obtain a semi-finished sleeve.

[0039] S2: irradiate polytetrafluoroethylene under vacuum, with a radiation voltage of 0.5MV, a radiation beam current of 15mA, and a vehicle speed of 30m / min. Preliminarily activate the nanofiller by vacuum drying at 120°C for 2.5h, then mix and stir the activated nanofiller with the coupling agent for 20 minutes to obtain a nanofiller-coupling agent composite, mix the irradiated polytetrafluoroethylene, reinforcing resin, nanofiller-coupling agent composite, fiber filler, and dispersant, stir evenly to obtain a mixture, apply the mixture on both sides of the inner and outer sides of the semi-finished casing, and after drying at 95°C, form a coating with an average thickness of 1μm to obtain a stainless steel wire braided casing.

[0040] Example 8 The difference between Example 8 and Example 7 is that the stainless steel wire braided mesh sleeve is passivated in advance.

[0041] The preparation method of the stainless steel wire braided sleeve comprises the following specific steps: S1: The stainless steel wire is cleaned and then braided, and a double-strand twill weave with a weaving angle of 45° is used to make a stainless steel wire braided mesh sleeve. The stainless steel wire braided mesh sleeve is ultrasonically cleaned at a cleaning temperature of 50°C for 15 minutes, and then the stainless steel wire braided mesh sleeve is passivated at 50°C for 25 minutes, and then the inner layer material is inserted into the stainless steel wire braided mesh sleeve, and pressed at a pressure of 800MPa for 10 minutes to obtain a semi-finished sleeve.

[0042] S2: irradiate polytetrafluoroethylene under vacuum, with a radiation voltage of 0.5MV, a radiation beam current of 15mA, and a vehicle speed of 30m / min. Preliminarily activate the nanofiller by vacuum drying at 120°C for 2.5h, then mix and stir the activated nanofiller with the coupling agent for 20 minutes to obtain a nanofiller-coupling agent composite, mix the irradiated polytetrafluoroethylene, reinforcing resin, nanofiller-coupling agent composite, fiber filler, and dispersant, stir evenly to obtain a mixture, apply the mixture on both sides of the inner and outer sides of the semi-finished casing, and after drying at 95°C, form a coating with an average thickness of 1μm to obtain a stainless steel wire braided casing.

[0043] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the stainless steel wire braided sleeve does not use an inner layer material.

[0044] The preparation method of the stainless steel wire braided sleeve comprises the following specific steps: The stainless steel wire is cleaned and then braided, and a double-strand twill braid with a braiding angle of 45° is used to make a stainless steel wire braided mesh sleeve. The stainless steel wire braided mesh sleeve is ultrasonically cleaned at a cleaning temperature of 50°C and a ultrasonic cleaning time of 15 minutes. Polytetrafluoroethylene, reinforcing resin, nanofiller, fiber filler, dispersant and coupling agent are mixed and stirred to obtain a mixture. The mixture is coated on the inner and outer sides of the stainless steel wire braided mesh sleeve, and after drying at 95°C, a coating with an average thickness of 1 μm is formed to obtain a stainless steel wire braided sleeve.

[0045] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the stainless steel wire braided sleeve is not coated with a corrosion-resistant coating.

[0046] The preparation method of the stainless steel wire braided sleeve comprises the following specific steps: The stainless steel wire is cleaned and then woven, and a double-strand twill weave with a weaving angle of 45° is used to make a stainless steel wire braided mesh sleeve. The stainless steel wire braided mesh sleeve is ultrasonically cleaned at a cleaning temperature of 50°C and a ultrasonic cleaning time of 15 minutes. The inner layer material is then inserted into the stainless steel wire braided mesh sleeve, and pressed at a pressure of 800 MPa for 10 minutes to obtain a stainless steel wire braided sleeve.

[0047] Performance testing According to the stainless steel wire braided sleeves provided in Examples 1-8 and Comparative Examples 1-2 of the present application, the following performance tests were performed, and the specific test results are shown in Table 1.

[0048] Detection Methods 1. Mechanical properties With reference to the standards of GB / T 1447-2005 "Test method for tensile properties of fiber reinforced plastics" and GB / T 1039-1992 "General principles for test methods for mechanical properties of plastics", the tensile strength and elongation at break of the stainless steel wire braided sleeve prepared in this application were tested.

[0049] 2. Wear resistance The stainless steel wire braided sleeve prepared in the present application was subjected to a wear resistance test on an MLD-10 dynamic load abrasive wear testing machine. The stainless steel wire braided sleeve was cut into 10mm×10mm×30mm samples, the abrasive was 1mm-2mm refined quartz sand, the flow rate was 450mL / min, and the impact energy was 5.0J; the mass after wear was measured every 30min, for a total of 5 times, and the wear was carried out for 2h, and the wear resistance was judged by the weight loss of the sample.

[0050] 3. Corrosion resistance The stainless steel wire braided sleeve prepared in the present application is placed in a corrosive solution, which is a 35% by mass nitric acid solution, and corroded at room temperature and 100° C. for 72 hours, respectively, to detect the corrosion degree of the corrosive solution on the stainless steel wire braided sleeve.

[0051] Table 1: Performance test results data table It can be seen from the performance test results that the stainless steel wire braided sleeve prepared in the present application has good strength and corrosion resistance. By comparing comparative examples 1-2 with embodiment 1, it can be seen that comparative example 1 does not use inner layer material, and comparative example 2 does not use corrosion-resistant coating. It can be seen from the performance test results that the strength of the stainless steel wire braided sleeve prepared in comparative example 1 is significantly reduced, and the corrosion resistance of the stainless steel wire braided sleeve prepared in comparative example 2 is significantly reduced. It is further explained that the present application uses stainless steel wire and weaves it into a mesh sleeve. The inner layer material is combined in the stainless steel wire braided mesh sleeve, which is beneficial to improving the strength, high temperature resistance and wear resistance of the stainless steel wire braided sleeve. The corrosion-resistant coating is coated on the inside and outside of the stainless steel wire braided sleeve, which is beneficial to improving the chemical corrosion resistance and wear resistance of the stainless steel wire braided sleeve.

[0052] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A stainless steel wire braided sleeve, characterized in that: It includes stainless steel wire and inner layer material, the stainless steel wire is woven to form a stainless steel wire braided mesh sleeve, the inner layer material is inserted into the stainless steel wire braided mesh sleeve, the inner layer material is one of a plastic tube and a rubber tube, the stainless steel wire braided sleeve is coated with a corrosion-resistant coating inside and outside, and the corrosion-resistant coating includes the following raw materials in parts by weight: 100-120 parts of polytetrafluoroethylene, 20-30 parts of reinforcing resin, 10-20 parts of nano filler, 10-20 parts of fiber filler, 3-5 parts of dispersant, and 3-5 parts of coupling agent.

2. The stainless steel wire braided sleeve according to claim 1, characterized in that: The reinforcing resin is at least one of phenolic epoxy resin, acrylic resin and polyamide-imide.

3. The stainless steel wire braided sleeve according to claim 2, characterized in that: The polytetrafluoroethylene is irradiated in advance.

4. The stainless steel wire braided sleeve according to claim 1, characterized in that: The nano filler is at least one of nano silicon nitride, nano silicon dioxide and silicon carbide.

5. The stainless steel wire braided sleeve according to claim 4, characterized in that: The nano filler is preliminarily subjected to surface modification treatment with a coupling agent.

6. The stainless steel wire braided sleeve according to claim 1, characterized in that: The stainless steel wire is one of 304, 316 and 316L stainless steel wires, and the diameter of the stainless steel wire is 0.1-0.5 mm.

7. The stainless steel wire braided sleeve according to claim 6, characterized in that: The stainless steel wire is woven by multiple strands, and the weaving structure is one of plain weave, twill weave and satin weave. The weaving angle of the stainless steel wire is 45-60°.

8. A method for preparing a stainless steel wire braided sleeve according to any one of claims 1 to 7, characterized in that: The specific steps include: The stainless steel wire is cleaned and then braided to form a stainless steel wire braided mesh sleeve, the stainless steel wire braided mesh sleeve is ultrasonically cleaned at a cleaning temperature of 40-60°C, an inner layer material is inserted into the stainless steel wire braided mesh sleeve, and pressed and connected at a pressure of 500-1000MPa to obtain a semi-finished casing, polytetrafluoroethylene, reinforcing resin, nanofiller, fiber filler, dispersant and coupling agent are mixed to obtain a mixture, the mixture is coated on the inner and outer sides of the semi-finished casing, and the stainless steel wire braided casing is dried at 90-100°C.

9. The method for preparing the stainless steel wire braided sleeve according to claim 8, characterized in that: The stainless steel wire braided mesh sleeve is pre-passivated, and then the inner layer material is inserted into the stainless steel wire braided mesh sleeve. The passivation treatment temperature is 40-60° C., and the passivation treatment time is 20-30 minutes.

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