Laminate, method for manufacturing same, and fluororubber composition

Patent metadata

Field	Value
Publication number	US-2016288461-A1
Application number	US-201415034214-A
Country	US
Kind code	A1
Filing date	Nov 12, 2014
Priority date	Nov 15, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

The present invention aims to provide a laminate in which a fluororesin layer and a fluororubber layer are firmly bonded even when the fluororesin layer contains a fluororesin having excellently low fuel permeability. The present invention relates to a laminate including a fluororubber layer (A) and a fluororesin layer (B) stacked on the fluororubber layer (A). The fluororubber layer (A) is a layer formed from a fluororubber composition. The fluororubber composition contains a fluororubber (a1) and a basic multifunctional compound having at least two nitrogen atoms in the molecule with a distance between the nitrogen atoms in the molecule of 5.70 Å or greater. The fluororubber (a1) has an absorption coefficient at 1720 cm −1 , determined after being brought into contact with triethyl amine, of 0.35 or lower. The fluororesin layer (B) is formed from a fluororesin (b1) having a fuel permeability coefficient of 2.0 g·mm/m 2 /day or lower.

First claim

1 . A laminate comprising:
a fluororubber layer (A); and a fluororesin layer (B) stacked on the fluororubber layer (A), the fluororubber layer (A) being a layer formed from a fluororubber composition, the fluororubber composition containing a fluororubber (a1) and a basic multifunctional compound having at least two nitrogen atoms in the molecule with a distance between the nitrogen atoms in the molecule of 5.70 Å or greater, the fluororubber (a1) having an absorption coefficient at 1720 cm −1 , determined after being brought into contact with triethyl amine, of 0.35 or lower, the fluororesin layer (B) being formed from a fluororesin (b1) having a fuel permeability coefficient of 2.0 g·mm/m 2 /day or lower.

2 . The laminate according to claim 1 ,
wherein the fluororesin (b1) is at least one selected from the group consisting of polychlorotrifluoroethylene, a chlorotrifluoroethylene-containing copolymer, and a tetrafluoroethylene/hexafluoropropylene/vinylidene fluoride copolymer, the tetrafluoroethylene/hexafluoropropylene/vinylidene fluoride copolymer having a copolymerization ratio (mol % ratio) of tetrafluoroethylene/hexafluoropropylene/vinylidene fluoride=(75 to 95)/(0.1 to 10)/(0.1 to 19).

3 . The laminate according to claim 1 ,
wherein the fluororubber composition contains a peroxide vulcanizing agent.

4 . The laminate according to claim 1 ,
wherein the fluororubber (a1) is at least one selected from the group consisting of a vinylidene fluoride/CH 2 ═CFRf 1 copolymer (wherein Rf l is a C1-C12 linear or branched fluoroalkyl group), a tetrafluoroethylene/propylene copolymer, a tetrafluoroethylene/propylene/vinylidene fluoride copolymer, an ethylene/tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, a vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene/perfluoro(alkyl vinyl ether)/ethylene copolymer, a vinylidene fluoride/hexafluoropropylene copolymer, and a vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene copolymer.

5 . The laminate according to claim 1 ,
wherein the basic multifunctional compound has two or more functional groups selected from —NH 2 , —NH 3 + , —NHCOOH, —NHCOO − , —N═CR 1 R 2 (wherein R 1 and R 2 are each individually a C0-C 12 organic group), —NR 3 R 4 (wherein R 3 and R 4 are each individually a C0-C12 organic group), and —NR 3 R 4 R 5 (wherein R 3 , R 4 , and R 5 are each individually a C0-C12 organic group).

6 . The laminate according to claim 1 ,
wherein the basic multifunctional compound has two or more functional groups selected from —NH 2 , —NH 3 + , —N═CR 1 R 2 (wherein R 1 and R 2 are each individually a C0-C12 organic group), and —NR 3 R 4 R 5 (wherein R 3 , R 4 , and R 5 are each individually a C0-C12 organic group).

7 . The laminate according to claim 1 ,
wherein the basic multifunctional compound is at least one selected from the group consisting of N,N′-dicinnamylidene-1,6-hexamethylenediamine and NH 2 —(CH 2 ) n —NH 2 (wherein n is 5 to 12).

8 . The laminate according to claim 1 ,
wherein the basic multifunctional compound is at least one selected from the group consisting of N,N′-dicinnamylidene-1,6-hexamethylenediamine and hexamethylenediamine.

9 . The laminate according to claim 1 , which has an initial interlayer bond strength of 5 N/cm or higher.

10 . The laminate according to claim 1 ,
wherein the fluororubber layer (A) is stacked on both sides of the fluororesin layer (B).

11 . The laminate according to claim 1 ,
wherein the fluororesin layer (B) is stacked on both sides of the fluororubber layer (A).

12 . The laminate according to claim 1 , further comprising a fluorine-free rubber layer (C1a),
wherein the fluororubber layer (A), the fluororesin layer (B), and the fluorine-free rubber layer (C1a) are stacked in the order set forth.

13 . The laminate according to claim 12 , further comprising a fluorine-free rubber layer (D1a),
wherein the layers are stacked in the order of the fluorine-free rubber layer (D1a), the fluororubber layer (A), the fluororesin layer (B), and the fluorine-free rubber layer (C1a); in the order of the fluororubber layer (A), the fluororesin layer (B), the fluorine-free rubber layer (D1a), and the fluorine-free rubber layer (C1a); or in the order of the fluororubber layer (A), the fluororesin layer (B), the fluorine-free rubber layer (C1a), and the fluorine-free rubber layer (D1a).

14 . The laminate according to claim 1 ,
wherein the fluororubber layer (A) and the fluororesin layer (B) are vulcanization-bonded to each other.

15 . A method for manufacturing a laminate comprising:
mixing a fluororubber (a1) and a basic multifunctional compound having at least two nitrogen atoms in the molecule with a distance between the nitrogen atoms in the molecule of 5.70 Å or greater to provide a fluororubber composition; stacking an unvulcanized fluororubber layer prepared by molding the fluororubber composition and a fluororesin layer; and vulcanizing the unvulcanized fluororubber layer and the fluororesin layer stacked, the fluororubber composition containing the fluororubber (a1) and the basic multifunctional compound, the fluororubber (a1) having an absorption coefficient at 1720 cm −1 , determined after being brought into contact with triethyl amine, of 0.35 or lower, the fluororesin layer being formed from a fluororesin (b1) having a fuel permeability coefficient of 2.0 g·mm/m 2 /day or lower.

16 . A fluororubber composition comprising:
a fluororubber (a1); and a basic multifunctional compound having at least two nitrogen atoms in the molecule with a distance between the nitrogen atoms in the molecule of 5.70 Å or greater, the fluororubber (a1) having an absorption coefficient at 1720 cm −1 , determined after being brought into contact with triethyl amine, of 0.35 or lower.

Assignees

• Daikin Ind Ltd

Inventors

• Kuwajima Yuuki
• Fukuoka Shoji
• Komazawa Kozue
• Taeda Mayuko
• Terada Junpei

Classifications

• B32B1/08

  Tubular products · CPC title

• B32B2307/714

  Inert, i.e. inert to chemical degradation, corrosion · CPC title

• B32B2597/00

  Tubular articles, e.g. hoses, pipes · CPC title

• B32B2307/7265

  Non-permeable · CPC title

• C08K5/14

  Peroxides · CPC title