Tearable fluoroplastic catheter as well as preparation method and application thereof

Abstract

The invention relates to the technical field of fluoroplastic conduits, in particular to a tearable fluoroplastic conduit and a preparation method and application thereof. The tearable fluoroplastic conduit is prepared from the following raw materials in percentage by mass: 82 to 96 percent of fluorine-containing resin and 4 to 18 percent of dispersion phase raw material, the melt index of the fluorine-containing resin is 2g / 10min to 15g / 10min, and the stripping force of the tearable fluoroplastic catheter is 6N to 8N. The tearable fluoroplastic catheter is convenient and easy to strip, the problem that the tearable fluoroplastic catheter is poor in tearable effect can be solved, the problem that a base tube is difficult to blow up and expand can be solved, and the tearable fluoroplastic catheter easy to strip is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of fluoroplastic catheters, and in particular to a tearable fluoroplastic catheter and a preparation method and application thereof. Background Art

[0002] In the process of processing medical device catheters, a multi-layer composite tube is used. Its structure is designed as an inner layer of PTFE material, a middle layer of stainless steel wire winding layer, and an outer layer of TPU or PEBAX tube; but these three layers of materials do not adhere to each other at room temperature, so they need to be adhered to form a whole with the help of a laminating process. The laminating process includes putting a heat shrink tube on the outer layer of the multi-layer composite tube, and then heating it at high temperature. During this process, the heat shrink tube transfers heat to the inner layer while shrinking, thereby causing the interlayer material of the multi-layer composite tube to melt and flow, and finally the inner layer, middle layer, and outer layer are tightly combined to form a complete whole. However, the heat shrink tube is not required in the finished tube of the multi-layer composite tube, so the heat shrink tube needs to be peeled off. However, since the heat shrink tube will be tightly wrapped on the multi-layer composite tube after heat shrinkage, the peeling work is difficult. The method commonly used at present is manual operation. Workers need to use a scalpel to gently cut a small incision first, and then carefully cut the heat shrink tube apart bit by bit. However, in this process, if the operation is slightly improper, it is very likely to cut the inner layer of the finished tube, thus causing the product to be scrapped. Therefore, this requires extremely high operating skills from the workers, the overall operation is difficult, and the scrap rate is relatively high.

[0003] A Chinese patent with the patent publication number CN111556942B discloses a thermoplastic fluorine-containing resin tube, which solves the problem of the existing heat-shrinkable tube having a gap or bubble formed at the joint of the conduit due to the heat shrinkage of the inner diameter when heated. However, the tube made by the method of producing more weld marks has a slightly poor tearing effect and has a certain complexity in mold processing.

[0004] Therefore, providing a convenient, easily peelable tearable fluoroplastic catheter is the main technical problem that needs to be solved at present. Summary of the invention

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a tearable fluoroplastic catheter. The raw materials for its preparation include 82% to 96% fluororesin and 4% to 18% dispersed phase raw materials, calculated by mass percentage; the melt index of the fluororesin is 2g / 10min to 15g / 10min, and the peeling force of the tearable fluoroplastic catheter is 6N to 8N.

[0006] In one embodiment, the raw materials for its preparation include 85% to 96% of fluorine-containing resin and 4% to 15% of dispersed phase raw materials, calculated by mass percentage.

[0007] In one embodiment, the raw materials for its preparation include 85% to 92% of fluorine-containing resin and 8% to 15% of dispersed phase raw materials, calculated by mass percentage.

[0008] In one embodiment, the fluorine-containing resin includes FEP and PFA.

[0009] In one embodiment, the FEP can be purchased from Daikin Fluorochemical NP20.

[0010] In one embodiment, the PFA can be purchased from Daikin Fluorochemical AP210.

[0011] In one embodiment, the dispersed phase raw material includes one or more combinations of FEP, PET, ECTFE, and TLCP.

[0012] In order to improve the tearability of fluoroplastic catheters and obtain dimensionally stable, convenient and easy-to-peel fluoroplastic catheters, the inventors found in the experimental process that the melt index of fluororesin is 2g / 10min-15g / 10min, one or more of FEP, PET, ECTFE and TLCP are used as dispersed phase raw materials, and the raw materials are composed of 82%-96% fluororesin and 4%-18% dispersed phase raw materials, especially when the raw materials are composed of 85%-96% fluororesin and 4%-15% dispersed phase raw materials, and especially when the raw materials are composed of 85%-92% fluororesin and 8%-15% dispersed phase raw materials, by After the dispersed phase raw material is mixed with the fluorine-containing resin, a single-screw extruder is used to mix the mixed pellets. However, the compatibility of ECTFE, TLCP, and PET with the fluorine-containing resin is poor. During the extrusion process of the extruder, the dispersed phase raw material will form fibrous crystals under the tensile effect and disperse into the fluorine-containing resin, and the tensile strength of the mixed pellets in the axial direction is increased. The inventor found that when the amount of dispersed phase raw material added is too low, the number of in-situ fiber formation is too small, and the tearing effect of the fluoroplastic conduit is not good; when the amount of dispersed phase raw material added is too high, the obtained base tube is difficult to be inflated and expanded, and the tube will explode during the inflation and expansion process, and it cannot be expanded smoothly. The inventor also found that when FEP and PFA are used as the raw materials for preparation, the base tube obtained after inflation and expansion cooling to obtain the fluoroplastic conduit is difficult to tear.

[0013] In one embodiment, the manufacturer model of the PET available for purchase includes Zhejiang Hengyi Petrochemical Co., Ltd. PET chip HY-01.

[0014] In one embodiment, the manufacturer model from which the TLCP can be purchased includes Ningbo Jujia New Material Technology Co., Ltd. F310M.

[0015] A second aspect of the present invention provides a method for preparing a tearable fluoroplastic catheter, comprising the following steps:

[0016] The dispersed phase raw material is mixed with the fluorine-containing resin to obtain a mixed pellet, and the mixed pellet is added into an extruder for extrusion to obtain a base tube;

[0017] The base tube is inflated and expanded, and then cooled and shaped to obtain a tearable fluoroplastic catheter.

[0018] The dispersed phase raw material and the fluorine-containing resin are mixed and then mixed by a single screw extruder to obtain mixed pellets; to ensure the mixing effect of the dispersed phase raw material and the fluorine-containing resin, the obtained pellets can be repeatedly mixed by the single screw extruder.

[0019] The mixing temperature of the single screw extruder was set to 310°C, the single screw diameter was 30mm, and the single screw speed was 10rpm;

[0020] In one embodiment, the temperature of the first heating section of the extruder is 275-285°C, the temperature of the second heating section is 295-305°C, the temperature of the third heating section is 315-325°C, the temperature of the fourth heating section is 325-335°C, and the temperature of the fifth heating section is 335-345°C.

[0021] The temperature of the first heating section of the extruder is 280°C, the temperature of the second heating section is 300°C, the temperature of the third heating section is 320°C, the temperature of the fourth heating section is 330°C, and the temperature of the fifth heating section is 340°C.

[0022] In one embodiment, the extrusion rate of the extruder is 3-7 rpm, the stretching ratio is 12-16, the outer diameter of the mandrel is 8-10 mm, and the inner diameter of the die is 9-11 mm.

[0023] In one embodiment, the extrusion rate of the extruder is 5 rpm, the stretch ratio is 14, the outer diameter of the mandrel is 8.8 mm, and the inner diameter of the die is 10 mm.

[0024] In one embodiment, the base tube has an inner diameter of 2 mm and an outer diameter of 2.7 mm.

[0025] In one embodiment, after the base tube is heated, compressed air is filled into it for inflation and expansion, the inflation and expansion temperature is less than 200° C., and the pressure of the compressed air is greater than 0.7 MPa.

[0026] In one embodiment, the inflation expansion temperature is 115°C to 125°C.

[0027] In one embodiment, the inflation expansion temperature is 120° C., and the pressure of the compressed air is 0.9 MPa.

[0028] In one embodiment, the cooling and setting temperature is 10°C to 18°C.

[0029] In one embodiment, the cooling and setting temperature is 15°C.

[0030] In one embodiment, the tearable fluoroplastic catheter has an inner diameter of 2.7 mm and an outer diameter of 3.3 mm.

[0031] A third aspect of the present invention provides an application of a tearable fluoroplastic catheter, wherein the tearable fluoroplastic catheter is applied in the fields of industry and medical device technology.

[0032] Beneficial Effects

[0033] 1. The present application provides a convenient, easily peelable tearable fluoroplastic catheter.

[0034] 2. The fluoroplastic catheter provided in the present application is easy to tear and has good dimensional stability.

[0035] 3. In this application, 82% to 96% of fluorine-containing resin and 4% to 18% of dispersed phase raw materials are used in combination to improve the problem of poor tearing effect of fluoroplastic catheters.

[0036] 4. In the present application, 82% to 96% of fluorine-containing resin and 4% to 18% of dispersed phase raw material are used in combination, which can solve the problem that the base tube is difficult to inflate and expand.

[0037] 5. The preparation method of the tearable fluoroplastic catheter provided in the present application can improve the mixing effect of the dispersed phase raw material and the fluorine-containing resin, and obtain an easily peelable tearable fluoroplastic catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a diagram showing the effect of tearing a fluoroplastic catheter.

[0039] Figure 2 The peeling force variation state during the peeling force test of the fluoroplastic catheter provided in Example 1.

[0040] Figure 3 The tearable fluoroplastic catheter provided in Example 2 was subjected to SEM electron microscope testing results. DETAILED DESCRIPTION

[0041] Example 1

[0042] In a first aspect of this embodiment, a tearable fluoroplastic catheter is provided, wherein the raw materials for its preparation are 85% of fluororesin and 15% of dispersed phase raw materials, calculated by mass percentage;

[0043] The fluorine-containing resin is FEP, and the manufacturer model of the FEP is Japan Daikin Fluorochemical NP20.

[0044] The dispersed phase raw material is TLCP, and the manufacturer model of the TLCP is Ningbo Jujia New Material Technology Co., Ltd. F310M.

[0045] A second aspect of this embodiment provides a method for preparing a tearable fluoroplastic catheter, comprising the following steps:

[0046] The dispersed phase raw material is mixed with the fluorine-containing resin to obtain a mixed pellet, and the mixed pellet is added into an extruder for extrusion to obtain a base tube;

[0047] The base tube is inflated and expanded, and then cooled and shaped to obtain a tearable fluoroplastic catheter.

[0048] The dispersed phase raw material and the fluorine-containing resin are added to a single-screw extruder for mixing to obtain mixed pellets; the mixed pellets are then mixed in a single-screw extruder twice to obtain mixed pellets, and the mixed pellets are added to an extruder for extrusion to obtain a base tube.

[0049] The mixing temperature of the single-screw extruder was set at 310° C., the single-screw diameter was 30 mm, and the single-screw speed was 10 rpm.

[0050] The temperature of the first heating section of the extruder is 280°C, the temperature of the second heating section is 300°C, the temperature of the third heating section is 320°C, the temperature of the fourth heating section is 330°C, and the temperature of the fifth heating section is 340°C.

[0051] The extrusion rate of the extruder is 5 rpm, the stretch ratio is 14, the outer diameter of the mandrel is 8.8 mm, and the inner diameter of the die is 10 mm.

[0052] The base tube has an inner diameter of 2 mm and an outer diameter of 2.7 mm.

[0053] After the base tube is heated, compressed air is filled into the base tube for inflation and expansion. The inflation and expansion temperature is 120° C. and the pressure of the compressed air is 0.9 MPa.

[0054] The cooling and setting temperature is 15°C.

[0055] The tearable fluoroplastic catheter has an inner diameter of 2.7 mm and an outer diameter of 3.3 mm.

[0056] A third aspect of this embodiment provides an application of a tearable fluoroplastic catheter, wherein the tearable fluoroplastic catheter is applied in the fields of industry and medical device technology.

[0057] Example 2

[0058] In a first aspect of this embodiment, a tearable fluoroplastic catheter is provided, wherein the raw materials for its preparation are 92% fluororesin and 8% dispersed phase raw materials, calculated by mass percentage;

[0059] The fluorine-containing resin is FEP, and the manufacturer model of the FEP is Japan Daikin Fluorochemical NP20.

[0060] The dispersed phase raw material is PET, and the PET is purchased from Zhejiang Hengyi Petrochemical Co., Ltd. PET chip HY-01.

[0061] A second aspect of this embodiment provides a method for preparing a tearable fluoroplastic catheter, comprising the following steps:

[0062] The dispersed phase raw material is mixed with the fluorine-containing resin to obtain mixed pellets, and the mixed pellets are added into an extruder for extrusion to obtain a base tube.

[0063] The base tube is inflated and expanded, and then cooled and shaped to obtain a tearable fluoroplastic catheter.

[0064] The dispersed phase raw material and the fluorine-containing resin are added to a single-screw extruder for mixing to obtain mixed pellets; the mixed pellets are then mixed in a single-screw extruder twice to obtain mixed pellets, and the mixed pellets are added to an extruder for extrusion to obtain a base tube.

[0065] The mixing temperature of the single-screw extruder was set at 310° C., the single-screw diameter was 30 mm, and the single-screw speed was 10 rpm.

[0066] The temperature of the first heating section of the extruder is 280°C, the temperature of the second heating section is 300°C, the temperature of the third heating section is 320°C, the temperature of the fourth heating section is 330°C, and the temperature of the fifth heating section is 340°C.

[0067] The extrusion rate of the extruder is 5 rpm, the stretch ratio is 14, the outer diameter of the mandrel is 8.8 mm, and the inner diameter of the die is 10 mm.

[0068] The base tube has an inner diameter of 2 mm and an outer diameter of 2.7 mm.

[0069] After the base tube is heated, compressed air is filled into the base tube for inflation and expansion. The inflation and expansion temperature is 120° C. and the pressure of the compressed air is 0.9 MPa.

[0070] The cooling and setting temperature is 15°C.

[0071] The tearable fluoroplastic catheter has an inner diameter of 2.7 mm and an outer diameter of 3.3 mm.

[0072] A third aspect of this embodiment provides an application of a tearable fluoroplastic catheter, wherein the tearable fluoroplastic catheter is applied in the fields of industry and medical device technology.

[0073] Comparative Example 1

[0074] The first aspect of this comparative example provides a fluoroplastic conduit, the raw material for preparing the conduit is a fluorine-containing resin.

[0075] The fluorine-containing resin is FEP, and the manufacturer model of the FEP is Japan Daikin Fluorochemical NP20.

[0076] The second aspect of this comparative example provides a method for preparing a fluoroplastic catheter, comprising the following steps:

[0077] Adding fluorine-containing resin into an extruder for extrusion to obtain a base tube;

[0078] The base tube is inflated and expanded, and then cooled and shaped to obtain a fluoroplastic conduit.

[0079] The temperature of the first heating section of the extruder is 280°C, the temperature of the second heating section is 300°C, the temperature of the third heating section is 320°C, the temperature of the fourth heating section is 330°C, and the temperature of the fifth heating section is 340°C.

[0080] The extrusion rate of the extruder is 5 rpm, the stretch ratio is 14, the outer diameter of the mandrel is 8.8 mm, and the inner diameter of the die is 10 mm.

[0081] The base tube has an inner diameter of 2 mm and an outer diameter of 2.7 mm.

[0082] After the base tube is heated, compressed air is filled into the base tube for inflation and expansion. The inflation and expansion temperature is 120° C. and the pressure of the compressed air is 0.9 MPa.

[0083] The cooling and setting temperature is 15°C.

[0084] The inner diameter of the fluoroplastic catheter is 2.7 mm and the outer diameter is 3.3 mm.

[0085] The fluoroplastic catheter obtained in this comparative example cannot be torn.

[0086] Comparative Example 2

[0087] The first aspect of this comparative example provides a fluoroplastic conduit, wherein the raw materials for its preparation are 97% of fluorine-containing resin and 3% of dispersed phase raw materials, calculated by mass percentage;

[0088] The fluorine-containing resin is FEP, and the manufacturer model of the FEP is Japan Daikin Fluorochemical NP20.

[0089] The dispersed phase raw material is PET, and the PET is purchased from Zhejiang Hengyi Petrochemical Co., Ltd. PET chip HY-01.

[0090] The second aspect of this comparative example provides a method for preparing a fluoroplastic catheter, comprising the following steps:

[0091] The dispersed phase raw material is mixed with the fluorine-containing resin to obtain a mixed pellet, and the mixed pellet is added into an extruder for extrusion to obtain a base tube;

[0092] The base tube is inflated and expanded, and then cooled and shaped to obtain a fluoroplastic conduit.

[0093] The dispersed phase raw material and the fluorine-containing resin are added to a single-screw extruder for mixing to obtain mixed pellets; the mixed pellets are then mixed in a single-screw extruder twice to obtain mixed pellets, and the mixed pellets are added to an extruder for extrusion to obtain a base tube.

[0094] The mixing temperature of the single-screw extruder was set at 310° C., the single-screw diameter was 30 mm, and the single-screw speed was 10 rpm.

[0095] The temperature of the first heating section of the extruder is 280°C, the temperature of the second heating section is 300°C, the temperature of the third heating section is 320°C, the temperature of the fourth heating section is 330°C, and the temperature of the fifth heating section is 340°C.

[0096] The extrusion rate of the extruder is 5 rpm, the stretch ratio is 14, the outer diameter of the mandrel is 8.8 mm, and the inner diameter of the die is 10 mm.

[0097] The base tube has an inner diameter of 2 mm and an outer diameter of 2.7 mm.

[0098] After the base tube is heated, compressed air is filled into the base tube for inflation and expansion. The inflation and expansion temperature is 120° C. and the pressure of the compressed air is 0.9 MPa.

[0099] The cooling and setting temperature is 15°C.

[0100] The inner diameter of the fluoroplastic catheter is 2.7 mm and the outer diameter is 3.3 mm.

[0101] The fluoroplastic catheter obtained in this comparative example has poor tearing effect.

[0102] Comparative Example 3

[0103] The first aspect of this comparative example provides a fluoroplastic conduit, wherein the raw materials for its preparation are 80% of fluorine-containing resin and 20% of dispersed phase raw materials, calculated by mass percentage;

[0104] The fluorine-containing resin is FEP, and the manufacturer model of the FEP is Japan Daikin Fluorochemical NP20.

[0105] The dispersed phase raw material is PET, and the PET is purchased from Zhejiang Hengyi Petrochemical Co., Ltd. PET chip HY-01.

[0106] The second aspect of this comparative example provides a method for preparing a fluoroplastic catheter, comprising the following steps:

[0107] The dispersed phase raw material is mixed with the fluorine-containing resin to obtain a mixed pellet, and the mixed pellet is added into an extruder for extrusion to obtain a base tube;

[0108] The base tube is inflated and expanded, and then cooled and shaped to obtain a fluoroplastic conduit.

[0109] The dispersed phase raw material and the fluorine-containing resin are added to a single-screw extruder for mixing to obtain mixed pellets; the mixed pellets are then mixed in a single-screw extruder twice to obtain mixed pellets, and the mixed pellets are added to an extruder for extrusion to obtain a base tube.

[0110] The mixing temperature of the single screw extruder was set to 310°C, the single screw diameter was 30mm, and the single screw speed was 10rpm;

[0111] The temperature of the first heating section of the extruder is 280°C, the temperature of the second heating section is 300°C, the temperature of the third heating section is 320°C, the temperature of the fourth heating section is 330°C, and the temperature of the fifth heating section is 340°C.

[0112] The extrusion rate of the extruder is 5 rpm, the stretch ratio is 14, the outer diameter of the mandrel is 8.8 mm, and the inner diameter of the die is 10 mm.

[0113] The base tube has an inner diameter of 2 mm and an outer diameter of 2.7 mm.

[0114] After the base tube is heated, compressed air is filled into the base tube for inflation and expansion. The inflation and expansion temperature is 120° C. and the pressure of the compressed air is 0.9 MPa.

[0115] The cooling and setting temperature is 15°C.

[0116] It is difficult to obtain a fluoroplastic conduit with a stable size during the cooling and shaping process after the base tube is inflated and expanded, and the inner and outer diameters of the fluoroplastic conduit are uneven and fluctuate.

[0117] Comparative Example 4

[0118] The first aspect of this comparative example provides a fluoroplastic conduit, wherein the raw materials for its preparation are 98% of fluorine-containing resin and 2% of dispersed phase raw materials, calculated by mass percentage;

[0119] The fluorine-containing resin is FEP, and the manufacturer model of the FEP is Japan Daikin Fluorochemical NP20.

[0120] The dispersed phase raw material is TLCP, and the manufacturer model of the TLCP is Ningbo Jujia New Material Technology Co., Ltd. F310M.

[0121] The second aspect of this comparative example provides a method for preparing a fluoroplastic catheter, comprising the following steps:

[0122] The dispersed phase raw material is mixed with the fluorine-containing resin to obtain a mixed pellet, and the mixed pellet is added into an extruder for extrusion to obtain a base tube;

[0123] The base tube is inflated and expanded, and then cooled and shaped to obtain a fluoroplastic conduit.

[0124] The dispersed phase raw material and the fluorine-containing resin are added to a single-screw extruder for mixing to obtain mixed pellets; the mixed pellets are then mixed in a single-screw extruder twice to obtain mixed pellets, and the mixed pellets are added to an extruder for extrusion to obtain a base tube.

[0125] The mixing temperature of the single-screw extruder was set at 310° C., the single-screw diameter was 30 mm, and the single-screw speed was 10 rpm.

[0126] The temperature of the first heating section of the extruder is 280°C, the temperature of the second heating section is 300°C, the temperature of the third heating section is 320°C, the temperature of the fourth heating section is 330°C, and the temperature of the fifth heating section is 340°C.

[0127] The extrusion rate of the extruder is 5 rpm, the stretch ratio is 14, the outer diameter of the mandrel is 8.8 mm, and the inner diameter of the die is 10 mm.

[0128] The base tube has an inner diameter of 2 mm and an outer diameter of 2.7 mm.

[0129] After the base tube is heated, compressed air is filled into the base tube for inflation and expansion. The inflation and expansion temperature is 120° C. and the pressure of the compressed air is 0.9 MPa.

[0130] The cooling and setting temperature is 15°C.

[0131] The inner diameter of the fluoroplastic catheter is 2.7 mm and the outer diameter is 3.3 mm.

[0132] The fluoroplastic catheter obtained in this comparative example has poor tearing effect.

[0133] Comparative Example 5

[0134] The first aspect of this comparative example provides a fluoroplastic conduit, wherein the raw materials for its preparation are 85% of fluorine-containing resin and 15% of dispersed phase raw materials, calculated by mass percentage;

[0135] The fluorine-containing resin is FEP, and the manufacturer model of the FEP is Japan Daikin Fluorochemical NP20.

[0136] The dispersed phase raw material is TLCP, and the manufacturer model of the TLCP is Ningbo Jujia New Material Technology Co., Ltd. F310M.

[0137] The second aspect of this comparative example provides a method for preparing a fluoroplastic catheter, comprising the following steps:

[0138] The dispersed phase raw material is mixed with the fluorine-containing resin to obtain a mixed pellet, and the mixed pellet is added into an extruder for extrusion to obtain a base tube;

[0139] The base tube is inflated and expanded, and then cooled and shaped to obtain a fluoroplastic conduit.

[0140] The dispersed phase raw material and the fluorine-containing resin are added to a single-screw extruder for mixing to obtain mixed pellets; the mixed pellets are then mixed in a single-screw extruder twice to obtain mixed pellets, and the mixed pellets are added to an extruder for extrusion to obtain a base tube.

[0141] The mixing temperature of the single-screw extruder was set at 310° C., the single-screw diameter was 30 mm, and the single-screw speed was 10 rpm.

[0142] The temperature of the first heating section of the extruder is 280°C, the temperature of the second heating section is 300°C, the temperature of the third heating section is 320°C, the temperature of the fourth heating section is 330°C, and the temperature of the fifth heating section is 340°C.

[0143] The extrusion rate of the extruder is 5 rpm, the stretch ratio is 14, the outer diameter of the mandrel is 8.8 mm, and the inner diameter of the die is 10 mm.

[0144] The base tube obtained by adding the mixed pellets into the extruder for extrusion is prone to cracking and cannot be inflated and expanded to obtain a fluoroplastic conduit.

[0145] Performance Testing

[0146] 1. Inner diameter expansion ratio:

[0147] The ratio of the inner diameter of the fluoroplastic conduit to the inner diameter of the base tube was calculated and the ratio was used as the inner diameter expansion ratio. The calculation results are shown in Table 1.

[0148] 2. Tearing performance:

[0149] (1) Peeling force: The fluoroplastic catheters obtained in the examples and comparative examples were tested for peeling force according to GB / T 8808 Peeling test method for soft composite plastic materials, with a test speed of 50 mm / min. The test results are shown in Table 1. The peeling force change state of the fluoroplastic catheter provided in Example 1 during the peeling force test is shown in Table 1. Figure 2 .

[0150] (2) Tear resistance: The fluoroplastic catheters obtained in the examples and comparative examples were placed in an oven at 210°C for 10 min and then taken out. The inner diameter and outer diameter of the fluoroplastic catheters with good tearability were tested. The test results are shown in Table 1. A small incision of 5 mm in length was cut on the end face of the fluoroplastic catheter, and the catheter was torn along the incision direction by hand. The tear length was tested and the tearing state was recorded. The test results are shown in Table 1. Figure 1 This is a diagram showing the effect of tearing a fluoroplastic catheter.

[0151] 3. Microscopic state test:

[0152] The tearable fluoroplastic catheter provided in Example 2 was subjected to SEM electron microscope testing, and the microscopic test results obtained are shown in Figure 3 .

[0153] pass Figure 3 It can be seen that the dispersed phase raw material forms fibrous crystals and is dispersed in the fluorine-containing resin.

[0154] Table 1

[0155]

[0156]

[0157] In Table 1, “ / ” means that it cannot be measured or was not measured.

[0158] It can be seen from the test results in Table 1 that the use of 82% to 96% fluorine-containing resin and 4% to 18% dispersed phase raw material in Example 1 and Example 2 can improve the problem of poor tearing effect of fluoroplastic conduits and the problem that the base tube is difficult to inflate and expand, and obtain easily peelable and tearable fluoroplastic conduits with good dimensional stability and a tear length of >1.2m.

Claims

1. A tearable fluoroplastic catheter, characterized in that: The raw materials for its preparation include 82% to 96% of fluorine-containing resin and 4% to 18% of dispersed phase raw materials by mass percentage; the melting index of the fluorine-containing resin is 2g / 10min to 15g / 10min, and the peeling force of the tearable fluoroplastic catheter is 6N to 8N.

2. The tearable fluoroplastic catheter according to claim 1, characterized in that: Calculated by mass percentage, the preparation raw materials include 85% to 96% of fluorine-containing resin and 4% to 15% of dispersed phase raw materials.

3. The tearable fluoroplastic catheter according to claim 1, characterized in that: The fluorine-containing resin includes FEP and PFA.

4. The tearable fluoroplastic catheter according to claim 1, characterized in that: The dispersed phase raw material includes one or more combinations of FEP, PET, ECTFE, and TLCP.

5. A method for preparing a tearable fluoroplastic catheter as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: The dispersed phase raw material is mixed with the fluorine-containing resin to obtain a mixed pellet, and the mixed pellet is added into an extruder for extrusion to obtain a base tube; The base tube is inflated and expanded, and then cooled and shaped to obtain a tearable fluoroplastic catheter.

6. The method for preparing a tearable fluoroplastic catheter according to claim 5, characterized in that: The temperature of the first heating section of the extruder is 275-285°C, the temperature of the second heating section is 295-305°C, the temperature of the third heating section is 315-325°C, the temperature of the fourth heating section is 325-335°C, and the temperature of the fifth heating section is 335-345°C.

7. The method for preparing a tearable fluoroplastic catheter according to claim 5, characterized in that: The extrusion rate of the extruder is 3-7 rpm, the stretching ratio is 12-16, the outer diameter of the core rod is 8-10 mm, and the inner diameter of the die is 9-11 mm.

8. The method for preparing a tearable fluoroplastic catheter according to claim 5, characterized in that: After being heated, the base tube is filled with compressed air for inflation and expansion. The inflation and expansion temperature is less than 200° C., and the pressure of the filled compressed air is greater than 0.7 MPa.

9. The method for preparing a tearable fluoroplastic catheter according to claim 8, characterized in that: The inflation expansion temperature is 115°C to 125°C.

10. Use of the tearable fluoroplastic catheter as claimed in any one of claims 1 to 4, characterized in that: The tearable fluoroplastic catheter is used in the fields of industry and medical device technology.

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