Hose for transportation of refrigerant
A hose for transportation of refrigerant includes an inner layer, a reinforcing layer, and an outer layer. The inner and outer layers each include a thermoplastic resin composition having a sea-island structure including a matrix containing a thermoplastic resin and a domain containing an elastomer. A water vapor permeability coefficient of the thermoplastic resin composition of the outer layer at a temperature of 60° C. and a relative humidity of 100% is 10.0 g·mm/(m 2 ·24 h) or less. An oxygen permeability coefficient of the thermoplastic resin composition of the inner layer at a temperature of 21° C. and a relative humidity of 50% is 0.05 cm 3 mm/(m 2 ·day·mmHg) or less. A water vapor permeation amount of the hose is 6.0 mg/(240 h·cm 2 ) or less. A hydrofluoroolefin HFO-1234 yf permeation amount of the hose is 170 g/(m 2 ·72 h) or less, and the mass per 1 m 2 of the outer surface area of the hose is 3000 g/m 2 or less.
1 . A hose for transportation of refrigerant comprising:
an inner layer;
a reinforcing layer; and
an outer layer;
the outer layer comprising a thermoplastic resin composition A having a sea-island structure comprising a matrix containing a thermoplastic resin and a domain containing an elastomer,
the inner layer comprising a thermoplastic resin composition B having a sea-island structure comprising a matrix containing a thermoplastic resin and a domain containing an elastomer,
a water vapor permeability coefficient of the thermoplastic resin composition A at a temperature of 60° C. and a relative humidity of 100% being 10.0 g·mm/(m 2 ·24 h) or less,
an oxygen permeability coefficient of the thermoplastic resin composition B at a temperature of 21° C. and a relative humidity of 50% being 0.05 cm 3 ·mm/(m 2 ·day·mmHg) or less,
a water vapor permeation amount of the hose for transportation of refrigerant being 6.0 mg/(240 h·cm 2 ) or less,
a hydrofluoroolefin HFO-1234yf permeation amount of the hose for transportation of refrigerant being 170 g/(m 2 ·72 h) or less,
a mass per 1 m 2 of outer surface area of the hose for transportation of refrigerant being 3000 g/m 2 or less,
the water vapor permeability coefficient of the thermoplastic resin composition A being smaller than a water vapor permeability coefficient of the thermoplastic resin composition B,
the oxygen permeability coefficient of the thermoplastic resin composition B being smaller than an oxygen permeability coefficient of the thermoplastic resin composition A, and
the thermoplastic resin composition A and the thermoplastic resin composition B being different.
2 . The hose for transportation of refrigerant according to claim 1 , wherein the thermoplastic resin composition A and the thermoplastic resin composition B have, at a temperature of 25° C., a 10% modulus of 10.0 MPa or less.
3 . The hose for transportation of refrigerant according to claim 1 , wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise the domain at 50 vol % or more.
4 . The hose for transportation of refrigerant according to claim 1 , wherein the thermoplastic resin composition A and the thermoplastic resin composition B have, at a temperature of 25° C., an elongation at break of 100% or higher and a strength at break of 10 MPa or higher, and have, at a temperature of 150° C., an elongation at break of 100% or higher and a strength at break of 3 MPa or higher.
5 . The hose for transportation of refrigerant according to claim 1 , wherein the hose for transportation of refrigerant does not comprise a rubber layer requiring a vulcanization step.
6 . The hose for transportation of refrigerant according to claim 1 , wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise a thermoplastic resin having a melting point of 150° C. or higher.
7 . The hose for transportation of refrigerant according to claim 1 , wherein
the thermoplastic resin contained in the matrix of the thermoplastic resin composition A and the matrix of the thermoplastic resin composition B comprises at least one type selected from the group consisting of a polyamide, a polyester, a polyvinyl alcohol, and a polyketone, and
the elastomer contained in the domain of the thermoplastic resin composition A and the domain of the thermoplastic resin composition B comprises at least one type selected from the group consisting of an olefin-based elastomer and a butyl-based elastomer.
8 . The hose for transportation of refrigerant according to claim 1 , wherein
the thermoplastic resin composition A comprises nylon 12 in the matrix and a modified butyl rubber in the domain, and
the thermoplastic resin composition B comprises nylon 6 in the matrix and a modified butyl rubber in the domain.
9 . The hose for transportation of refrigerant according to claim 1 , wherein
the thermoplastic resin composition A and the thermoplastic resin composition B comprise a phenylenediamine-based or a quinoline-based anti-aging agent or a trihydric alcohol having a triazine backbone, at least one processing aid, and at least one viscosity stabilizer, and
50 mass % or more of the viscosity stabilizer is contained in the matrix.
10 . The hose for transportation of refrigerant according to claim 2 , wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise the domain at 50 vol % or more.
11 . The hose for transportation of refrigerant according to claim 10 , wherein the thermoplastic resin composition A and the thermoplastic resin composition B have, at a temperature of 25° C., an elongation at break of 100% or higher and a strength at break of 10 MPa or higher, and have, at a temperature of 150° C., an elongation at break of 100% or higher and a strength at break of 3 MPa or higher.
12 . The hose for transportation of refrigerant according to claim 11 , wherein the hose for transportation of refrigerant does not comprise a rubber layer requiring a vulcanization step.
13 . The hose for transportation of refrigerant according to claim 12 , wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise a thermoplastic resin having a melting point of 150° C. or higher.
14 . The hose for transportation of refrigerant according to claim 13 , wherein
the thermoplastic resin contained in the matrix of the thermoplastic resin composition A and the matrix of the thermoplastic resin composition B comprises at least one type selected from the group consisting of a polyamide, a polyester, a polyvinyl alcohol, and a polyketone, and
the elastomer contained in the domain of the thermoplastic resin composition A and the domain of the thermoplastic resin composition B comprises at least one type selected from the group consisting of an olefin-based elastomer and a butyl-based elastomer.
15 . The hose for transportation of refrigerant according to claim 14 , wherein
the thermoplastic resin composition A comprises nylon 12 in the matrix and a modified butyl rubber in the domain, and
the thermoplastic resin composition B comprises nylon 6 in the matrix and a modified butyl rubber in the domain.
16 . The hose for transportation of refrigerant according to claim 15 , wherein
the thermoplastic resin composition A and the thermoplastic resin composition B comprise a phenylenediamine-based or a quinoline-based anti-aging agent or a trihydric alcohol having a triazine backbone, at least one processing aid, and at least one viscosity stabilizer, and
50 mass % or more of the viscosity stabilizer is contained in the matrix.