Resin pipe and pipe material

Abstract

In a resin pipe, PVDF being a fluororesin is softened by adding a perfluoromonomer thereto, so that the oxygen permeability can be significantly reduced. The oxygen permeability can also be reduced by providing a nylon tube as an outer layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view showing a tube according to a first embodiment of this invention;

FIG. 2 is a sectional view for explaining a tube according to a second embodiment of this invention;

FIG. 3 is a diagram showing a measurement system for measuring properties of a tube according to this invention;

FIG. 4 is a graph showing permeated amounts of oxygen measured by the measurement system shown in FIG. 3;

FIG. 5 is a diagram showing the measurement results obtained using the measurement system shown in FIG. 3; and

FIG. 6 is an exploded view for explaining a tube according to a third embodiment of this invention.

Claims

1. A resin pipe having an oxygen permeability coefficient of 5×106 (molecules·cm/cm2·sec·Pa) or less and a flexural modulus of 1800 Mpa or less and containing a fluororesin.

2. A resin pipe according to claim 1, wherein the oxygen permeability coefficient is 2×106 (molecules·cm/cm2·sec·Pa) or less.

3. A resin pipe according to claim 1, wherein the resin pipe is integrally formed of two or more kinds of materials having different compositions.

4. A resin pipe according to claim 2, wherein the resin pipe comprises a layer of softened PVDF.

5. A resin pipe according to claim 1, wherein the resin pipe comprises a nylon layer.

6. A resin pipe according to claim 3, wherein the resin pipe is formed by combination of a layer of softened PVDF or nylon and a layer of one of ETFE, PTFE, PVDC, FEP, and PFA.

7. A resin pipe according to claim 1, wherein an inner surface of the resin pipe is made of a material having resistance to one of an alkaline aqueous solution, an acidic aqueous solution, a neutral aqueous solution, and an organic solvent.

8. A resin pipe having an oxygen permeability coefficient of 5×106 (molecules·cm/cm2·sec·Pa) or less and a flexural modulus of 1800 Mpa or less and adapted to transport a chemical solution or ultrapure water.

9. A resin pipe according to claim 8, wherein the oxygen permeability coefficient is 2×106 (molecules·cm/cm2·sec·Pa) or less.

10. A resin pipe according to claim 8, wherein the resin pipe is adapted to transport the chemical solution or the ultrapure water for use in manufacturing an electronic device or an electronic component.

11. A resin pipe according to claim 8, wherein the resin pipe is formed by a layer of a single material or is integrally formed by layers of a plurality of materials having different compositions.

12. A resin pipe according to claim 11, wherein said layer of the single material is a layer of softened PVDF or a nylon layer.

13. A resin pipe according to claim 11, wherein the resin pipe is formed by combination of a layer of softened PVDF or nylon and a layer of one of ETFE, PTFE, PVDC, FEP, and PFA.

14. A resin pipe according to claim 8, wherein an inner surface of the resin pipe is made of a material having resistance to one of an alkaline aqueous solution, an acidic aqueous solution, a neutral aqueous solution, and an organic solvent.

15. A resin pipe having a multilayer structure, wherein the resin pipe comprises a layer of PFA and a layer of nylon arranged on an outer side of said PFA layer.

16. A resin pipe according to claim 15, wherein said outer layer contains nylon 6.

17. A resin pipe according to claim 15, wherein said outer layer is made of nylon 6 or a copolymer of the nylon 6 and nylon 12.

18. A resin pipe according to claim 15, wherein said PFA layer is the innermost layer.

19. A resin pipe according to claim 15, wherein said layer of nylon is the outermost layer.