US 11,885,440 B2
Laminated rubber hose and method for manufacturing the same
Yuya Miyake, Kurashiki (JP)
Assigned to KURASHIKI KAKO CO., LTD., Kurashiki (JP)
Filed by KURASHIKI KAKO CO., LTD., Kurashiki (JP)
Filed on Apr. 30, 2020, as Appl. No. 16/863,937.
Claims priority of application No. 2019-092573 (JP), filed on May 16, 2019.
Prior Publication US 2020/0362994 A1, Nov. 19, 2020
Int. Cl. F16L 11/08 (2006.01); C08L 9/02 (2006.01); C08L 11/00 (2006.01); C08J 5/12 (2006.01); C08L 23/16 (2006.01)
CPC F16L 11/085 (2013.01) [C08J 5/122 (2013.01); C08L 9/02 (2013.01); C08L 11/00 (2013.01); C08L 23/16 (2013.01); C08J 2309/02 (2013.01); C08J 2311/00 (2013.01); C08J 2323/16 (2013.01); C08J 2411/00 (2013.01); C08J 2423/16 (2013.01); C08J 2461/06 (2013.01); C08J 2461/20 (2013.01); C08L 2203/18 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01)] 9 Claims
 
1. A method for manufacturing a laminated rubber hose that includes a first layer and a second layer laminated on an outer surface of the first layer,
the first layer being formed from a rubber material containing a thermosetting resin in an amount of 2.0 parts by mass or more and 4.0 parts by mass or less relative to 100 parts by mass of a rubber component,
the second layer being formed from a rubber material containing a thermosetting resin in an amount of 2.0 parts by mass or more and 4.0 parts by mass or less relative to 100 parts by mass of a rubber component,
the method comprising laminating the second layer on the outer surface of the first layer without using an adhesive with the outer surface of the first layer maintained at a temperature range of 65° C. or more and 105° C. or less, wherein:
the first layer includes an ethylene-propylene-diene rubber as the rubber component,
the second layer includes an ethylene-propylene-diene rubber as the rubber component,
the thermosetting resin contained in the first layer and the second layer includes at least a phenolic resin and a melamine resin,
at the laminating, vacuuming is performed on the first layer at 0.03 MPa or more and 0.08 MPa or less to make the first layer in an expanded state;
at least one of the rubber material forming the first layer or the rubber material forming the second layer contains sulfur; and
the first layer and the second layer adhere at least partially to each other, and adhesive strength between the first layer and the second layer is 25 N/cm or more.