WO2007139044A1

WO2007139044A1 - Tearable tube made of fluororesin

Info

Publication number: WO2007139044A1
Application number: PCT/JP2007/060761
Authority: WO
Inventors: Yuko Domoto
Original assignee: Junkosha Inc.
Priority date: 2006-05-30
Filing date: 2007-05-22
Publication date: 2007-12-06
Also published as: JP4889007B2; JP2007321817A

Abstract

Disclosed is a tearable tube which is made of a fluororesin. The fluororesin is composed of a mixture of a plurality of thermoplastic fluororesins which are different from one another.

Description

Description Tearable tube made of fluororesin Technical Field

The present invention relates to a tear tube made of a fluororesin, and particularly relates to a tear tube whose tube material is a thermoplastic fluororesin. Background art

The tear tube is used as a protective member until the use of various articles. Among them, the tear tube made of fluororesin has characteristics that cannot be obtained with a tear tube made of hydrocarbon synthetic resin such as heat resistance, chemical resistance, water and oil repellency, non-adhesiveness, and self-lubricating properties of fluororesin. Have. Therefore, these characteristics are used to protect tubes for precision instruments, electronic parts, etc., or as tubes for introducing medical equipment for introducing catheters, guide wires, etc. into the body.

The medical device introduction tube is not only necessary after the catheter is introduced into the body, but there is also a management problem to maintain hygiene, so after introducing the catheter into the body, tear the tube It is being pulled out.

The tear tube can reliably protect the equipment installed inside, and can be easily torn without using special equipment, and retains the properties of fluoropolymers. It is required to be.

So, in order to be able to tear easily, Tetrafluoro An extruded tube made of a fluorine resin obtained by extruding a mixture of an ethylene resin and a low molecular weight fluororesin has been proposed (see, for example, Japanese Utility Model Publication No. 6-7 4 14 48).

However, tetrafluoroethylene resin is the main component as the fluororesin, and the tube is formed by extruding the paste-like fluororesin, followed by drying and firing. Manufacturing required a multi-step process. Disclosure of the invention

It is an object of the present invention to provide a fluororesin tear tube that can be easily torn as a fluororesin tear tube, and is manufactured by a one-step molding process such as melt extrusion molding. An object of the present invention is to provide a fluororesin tear tube that can be manufactured.

The subject of the present invention is a fluorine resin tear tube made of a fluororesin tear tube made of a mixture of a plurality of different types of thermoplastic fluororesins. It can be solved by a tube.

In addition, the thermoplastic fluororesin mixture is one of tetrafluoroethylene monohexafluoropropylene copolymer, tetrafluoroethylene monoperfluoroalkyl butyl ether copolymer, and polyvinylidene fluoride. It is a tear tube made of the above-mentioned fluororesin, which is a mixture of styrene and tetrafluoroethylene-ethylene copolymer.

The thermoplastic fluororesin mixture is the above-mentioned fluororesin tear tube in which a tetrafluoroethylene-hexafluoropropylene copolymer and polyvinylidene fluoride are mixed. The tear tube made of the fluororesin of the present invention can be provided with tearability by melt extrusion molding a raw material blended with different types of thermoplastic fluororesins, so that it is easy to manufacture and has stable tear characteristics. A tear tube made of fluororesin can be obtained. BEST MODE FOR CARRYING OUT THE INVENTION

In the present invention, a raw material blended with a fluororesin made of different types of thermoplastic resin is formed into a tube shape by melt extrusion molding, so that it undergoes steps of paste preparation, extrusion molding, and firing like conventional fluororesins. It has been found that a tear tube having stable characteristics can be obtained.

The reason why a tube having tearability can be obtained by mixing different types of thermoplastic fluororesin is not clear, but the C-H bond or C-F in each molecule of different types of fluorocarbon resin. This is presumably due to the compatibility between fluororesins due to differences in bond lengths or differences in cohesive energy.

As a mixture of different types of thermoplastic fluorocarbon resins having a tearing property, specifically, tetrafluoroethylene monohexafluoropropylene copolymer (FEP), tetrafluoroethylene Examples thereof include a mixture of ethylene monoperfluoroalkyl ether copolymer (PFA) or polyvinylidene fluoride (PVDF) and tetrafluoroethylene monoethylene copolymer (ETFE).

In addition, a mixture of tetrafluoroethylene monohexafluoropropylene copolymer (FEP) and polyvinylidene fluoride (PVDF) can be mentioned.

The tearability of fluororesin tubes makes up each mixture Since it varies depending on the blending amount of different types of thermoplastic fluororesins, the blending amount can be set appropriately according to the purpose of use.

For example, when tetrafluoroethylene monoperfluoroalkyl butyl ether copolymer (P FA) and tetrafluoroethylene monoethylene copolymer (ETFE) are mixed, the mass ratio of P FA : ETFE = 95 5: 5 to 10: It is preferable to be in the range of 90.

When tetrafluoroethylene monohexafluoropropylene copolymer (FE P) and tetrafluoroethylene monoethylene copolymer (ETFE) are mixed, the mass ratio of FEP: ETFE = It is preferable to be in the range of 9 7: 3 to 50:50.

When polyvinylidene fluoride (PVDF) and tetrafluoroethylene monoethylene copolymer (ETFE) are mixed, PV DF: ETF E = 9 7: 3 to 2: 9 8 in mass ratio It is preferable that When polyvinylidene fluoride (PVDF) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP) are mixed, PVDF: FE P = 9 2: 8 to 3: It is preferable to be in the range of 9-7.

The above thermoplastic fluororesin composition may be blended with a filler or the like according to the purpose of use. Further, in order to enable photographing by X-ray irradiation, barium sulfate or the like may be added as a contrast agent in the thermoplastic fluororesin composition.

The tearing tube made of fluororesin of the present invention can be formed by molding a fluororesin composition mixed in a predetermined blending amount with a melt extrusion molding machine.

Specifically, using a single-screw melt extruder with a cylinder diameter of 2 Omm, tube forming by the sizing plate method at a screw speed of 10 rpm It can be performed.

Temperature conditions vary depending on the resin combination, but die temperature is 390 ° C for PFA—ETFE and die temperature is 3 10 for PVDF—ETFE. (: FE P—For ETFE, die temperature 360 ° C. For FEP-ET FE, die temperature 360 ° C. For FEP—PVDF, die temperature 310 ° C.

Depending on the blending ratio of the resin, the stability during molding can be increased by changing the temperature in consideration of the molding state.

The following examples illustrate the invention.

(Example 1)

(Sample preparation)

Combination of Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA—340 J made by Mitsui Fluoro DuPont) and Tetrafluoroethylene-ethylene copolymer (ETFE: C-1 88 AX made by Asahi Glass) Prepare mixtures with different ratios, and use each mixture to form a tube by the sizing plate method with a screw rotation speed of 10 rpm and a die temperature of 3 90 ° C using a single screw extruder with a cylinder diameter of 20 mm. A sample having an inner diameter of 1.0 mm, an outer diameter of 1.4 mm, and a thickness of 0.2 mm was prepared.

(Evaluation test method)

Test whether it is possible to tear only with the fingertip or whether it is possible to tear from the notch with a force razor. For those that can be cut with a razor and can be torn from the cut, it was evaluated as “Necessary to cut”.

For those that could be torn, a 4 Omm cut was made at one end of a 10 Omm length test. The tear strength was determined by measuring the maximum force at the time of tearing at a speed of OmmZmin. In addition, the measurement was performed three times for samples of the same composition, and the weighted average value was obtained and shown in Table 1.

(table 1)

(Example 2)

(Sample preparation)

Prepare a mixture in which the blending ratio of polyvinylidene fluoride (PVDF: KYNAR740 manufactured by Arkema) and tetrafluoroethylene-ethylene copolymer (ETFE: C-88AX manufactured by Asahi Glass) was changed. Using a single-screw extruder with a diameter of 2 Omm, the tube was formed by sizing plate method at a screw speed of 10 rpm and a die temperature of 310 ° C. The inner diameter was 1. Omm, the outer diameter was 1.4 mm, and the wall thickness was 0.2. A sample of mm was prepared.

(Evaluation test method)

Evaluation was conducted in the same manner as in Example 1, and the results are shown in Table 2.

(Table 2) Sample number PVDF concentration (% by mass) Tearability Tear strength (N)

2-1 1 Bow 1 No tearing ―

2-2 2 Notch required 7. 22

2-3 3 Notch required 6. 35

2-4 10 Tearing by hand 5. 65

2-5 50 Tearing by hand 0. 85

2-6 80 Notch required 3. 45

2-7 97 Notch required 4. 80

2-8 98 No tearing 9.06

(Example 3)

(Sample preparation)

Tetrafluoroethylene monohexafluoropropylene copolymer (FEP—100 J made by Mitsui Fluoro DuPont) and tetrafluoroethylene ethylene copolymer (ETFE: C-1 88 AX made by Asahi Glass) Mixtures with different blending ratios were prepared, and using each mixture, a single-screw extruder with a cylinder diameter of 2 Omm, a screw rotation speed of 10 rpm, and a die temperature of 360. A tube was sized by C using the sizing plate method to produce a sample with an inner diameter of 1.0 mm, an outer diameter of 1.4 mm, and a wall thickness of 0.2 mm.

(Evaluation test method)

Evaluation was conducted in the same manner as in Example 1, and the results are shown in Table 3.

(Table 3)

Sample number ETFE concentration (% by mass) Tearability Tear strength (N)

3-1 1 No tearing ―

3-2 2 Bow 1 Unbreakable

3-3 3 Cutting required 3. 89

3-4 5 Cut required 4.00

3-5 10 Notch required 3. 26

3-6 20 Notch required 1. 81

3-7 30 Tearing by hand 0. 36

3-8 40 Tearing by hand 0. 43

3-9 50 Tearing by hand 0. 74

3-10 60 No tearing ―

(Example 4)

(Sample preparation)

Prepared a mixture of poly (vinylidene fluoride) (PVDF: Arkema KYNAR 740) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP-100J, Mitsui Fluoro DuPont). Then, using each mixture, the screw rotation speed was 10 rpm and the die temperature was 310 by a single screw extruder having a cylinder diameter of 20 mm. C was formed into a tube by the sizing plate method, and a sample with an inner diameter of 1.0 mm, an outer diameter of 1.4 mm, and a wall thickness of 0.2 mm was produced.

(Evaluation test method)

Evaluation was conducted in the same manner as in Example 1, and the results are shown in Table 4.

(Table 4)

Sample number PVDF concentration (% by mass) Tearability Tear strength (N)

4- 1 2 No tearing ―

4-2 3 Cutting required 4. 07

4-3 1 0 Notch required 2. 1 5

4-4 50 Tearing by hand 0. 1 6

4-5 90 Cut required 6. 04

4-6 92 Notch required 8. 44

4-7 95 No tearing ―

4-8 9 8 No tearing ―

Industrial applicability

The tear tube produced by blending the different types of thermoplastic fluororesin of the present invention can produce a tear tube having a desired tear strength by changing the blending ratio of the thermoplastic fluororesin blended. Also, unlike conventional fluororesins, it can be manufactured without the multi-step process of extrusion molding, drying and firing of paste kneaded with an organic solvent, providing a stable tear tube with the desired characteristics. can do.

Claims

The scope of the claims

1. A fluororesin tear tube, wherein the fluororesin comprises a mixture of a plurality of different types of thermoplastic fluororesins.

2. The mixture of the thermoplastic fluororesin is selected from the group consisting of tetrafluoroethylene monohexafluoropropylene copolymer, tetrafluoroethylene monoperfluoroalkyl vinyl ether copolymer, polyvinylidene fluoride and tetra 2. The tear tube made of a fluororesin according to claim 1, wherein the tube is a mixture of fluoroethylene monoethylene copolymer.

3. The mixture of the thermoplastic fluororesin is a mixture of tetrafluoroethylene monohexafluoropyrene copolymer and polyvinylidene polyphenylene, according to claim 1, Tear tube.