Toothed belt
Provided is a toothed belt that has satisfactory durability even under high-temperature and high-load conditions or within an oil or water environment. The toothed belt 10 comprises a belt body 13 including a tooth rubber portion 11 and a backing rubber portion 12 . A surface of the tooth rubber portion 11 is covered with a facing fabric 20 . The facing fabric 20 is subjected to RFL treatment, and has an outer surface 21 covered with a hardened material of a first epoxy resin. The softening point of the hardened material of the first epoxy resin is, for example, 110° C. or higher. The epoxy equivalent of the first epoxy resin is, for example, 100 to 1500 g/eq. Alternatively, the facing fabric 20 is subjected to impregnation treatment with a treatment agent including a second epoxy resin, a hardener for hardening the second epoxy resin, and a rubber component.
1. A toothed belt comprising a belt body that includes a tooth portion and a tooth bottom portion alternately provided on one surface side thereof along the longitudinal direction, and a facing fabric which is provided on the one surface of the belt body and has an outer surface covered with a hardened material consisting of a hardened first epoxy resin.
2. The toothed belt according to claim 1 , wherein the softening point of the hardened material of the first epoxy resin is 110° C. or higher.
3. The toothed belt according to claim 1 , wherein the epoxy equivalent of the first epoxy resin is 100 to 1,500 g/eq.
4. The toothed belt according to claim 1 , wherein the hardened material of the first epoxy resin is applied to the facing fabric after the facing fabric is subjected to RFL treatment.
5. The toothed belt according to claim 1 , wherein the first epoxy resin is hardened by a first hardener.
6. The toothed belt according to claim 5 , wherein the first hardener includes at least one hardener selected from the group consisting of amine-based hardener, acid anhydride-based hardener, phenol novolak-based hardener, imidazole-based hardener, and dicyandiamide-based hardener.
7. The toothed belt according to claim 6 , wherein the first hardener is an imidazole-based hardener.
8. The toothed belt according to claim 1 , wherein the first epoxy resin includes at least one epoxy resin selected from the group consisting of bisphenol A epoxy resin, bisphenol F epoxy resin, novolak-type epoxy resin, biphenyl-type epoxy resin, phenoxy-type epoxy resin, and long-chain aliphatic epoxy resin.
9. A method of manufacturing a toothed belt having a belt body that includes a tooth portion and a tooth bottom portion alternately provided on one surface side thereof along the longitudinal direction, said method comprising:
coating one surface of a facing fabric with a first epoxy resin solution consisting of a solvent, a first epoxy resin and a first hardener;
evaporating the solvent;
integrating rubber disposed on the other surface side of the coated facing fabric with the facing fabric; and
hardening the first epoxy resin coating the facing fabric by vulcanization.
10. The toothed belt according to claim 1 , wherein the first epoxy resin includes at least one epoxy resin selected from the group consisting of novolak-type epoxy resin and bisphenol-A epoxy resin.
11. The toothed belt according to claim 4 , wherein the dry weight per unit area of the first epoxy resin applied to the facing fabric is less than half of the dry weight per unit area of the RFL treatment.
12. The toothed belt according to claim 1 , wherein said facing fabric has unevenness on the outer surface due to a weave texture of the facing fabric, and wherein said dry weight per unit area of the first epoxy resin applied to the facing fabric is such that said unevenness remains on the outer surface.
13. The toothed belt according to claim 1 , wherein the dry weight per unit area of the first epoxy resin applied to the facing fabric is in the range from about 10 g/m 2 to about 50 g/m 2 .
14. The toothed belt according to claim 1 , wherein the hardened material of the first epoxy resin is applied to the facing fabric after the facing fabric is subjected to a treatment agent composition including a second epoxy resin, a second hardener for hardening the second epoxy resin, and a rubber component.
15. The toothed belt according to claim 14 wherein the rubber component includes nitrile rubber, hydrogenated nitrile rubber, or hydrogenated carboxylic nitrile rubber.
16. The toothed belt according to claim 14 , wherein the weight ratio of the second epoxy resin to the rubber component is from 1:9 to 9:1.
17. The toothed belt according to claim 14 , wherein the adhesion amount (solid component) of the treatment agent composition to the facing fabric is from 5 to 200 g/m 2 .
18. The toothed belt according to claim 14 , wherein the rubber component is latex.
19. The toothed belt according to claim 14 , wherein the treatment agent composition further includes a vulcanizing agent for vulcanizing the rubber component.