Friction transmission belt and production method therefor
The frictional power transmission belt includes a frictional power transmission surface formed of a composite fibrous layer containing a fibrous member, an isocyanate compound, and a resin component, wherein the fibrous member contains a cellulose-based fiber. A proportion of each of the isocyanate compound and the resin component in the composite fibrous layer may be 2 to 15% by mass.
1. A frictional power transmission belt comprising a frictional power transmission surface formed of a composite fibrous layer comprising a fibrous member, an isocyanate compound, and a resin component, wherein the fibrous member contains a cellulose-based fiber.
2. The frictional power transmission belt according to claim 1 , wherein a proportion of each of the isocyanate compound and the resin component in the composite fibrous layer is 2 to 15% by mass.
3. The frictional power transmission belt according to claim 1 , wherein a mass ratio of the isocyanate compound to the resin component satisfies former:latter=95:5 to 20:80.
4. The frictional power transmission belt according to claim 1 , wherein the isocyanate compound is a thermally reactive isocyanate compound.
5. The frictional power transmission belt according to claim 4 , wherein the thermally reactive isocyanate compound has a dissociation temperature of 120° C. or higher.
6. The frictional power transmission belt according to claim 1 , wherein the resin component is a hydrophilic resin.
7. The frictional power transmission belt according to claim 1 , wherein the cellulose-based fiber is a spun yarn formed of cellulose.
8. The frictional power transmission belt according to claim 1 , wherein the fibrous member further contains a synthetic fiber.
9. The frictional power transmission belt according to claim 1 , which is a V-ribbed belt.
10. A method for producing the frictional power transmission belt according to claim 1 , the method comprising immersing a fibrous member into a liquid composition containing an isocyanate compound and a resin component, and then heat-setting the fibrous member impregnated with the liquid composition by using a pin tenter, to form a composite fibrous layer sheet.
11. The method according to claim 10 , wherein the liquid composition is an aqueous solution containing a thermally reactive isocyanate compound and a hydrophilic resin.
12. The method according to claim 11 , comprising drying the fibrous member impregnated with the liquid composition by the immersion at a temperature lower than a dissociation temperature of the thermally reactive isocyanate compound.
13. The method according to claim 10 , wherein a proportion of each of the isocyanate compound and the resin component in the liquid composition is 1 to 8% by mass.
14. The method according to claim 13 , wherein a mass ratio of the isocyanate compound to the resin component in the liquid composition satisfies former:latter=95:5 to 20:80.