Drive belt
The invention is directed to a drive belt of rubber or rubber-like plastic having a surface protection ( 5 ) which includes polyamide-containing textile reinforcement and/or polyester-containing textile reinforcement. On the outer side, a surface coating ( 6 ) of a friction-reducing material in a matrix of at least one elastic addition polymer is provided. For improved heat resistance with good protection against wear, the elastic addition polymer has less than 2% by weight based on the polymer of structural components —O—C x R y —O— with x=1-3 and y=0-6. The R in a structural component can be the same or can be different and is selected from hydrogen and/or carbon-containing groups.
1. Drive belt of rubber or plastic having, at a surface thereof, protective textile reinforcement which contains polyamide and/or polyester, and, at the outer side of the textile reinforcement, a coating comprising friction-reducing material in a matrix of at least one elastic addition polymer, wherein the elastic addition polymer has less than 2% by weight, based on the polymer, of —O—C x R y —O— structural components wherein x =1-3, y=0-6 and R is selected from hydrogen and carbon-containing groups.
2. Drive belt of claim 1 , wherein the elastic addition polymer has less than 0.5% by weight, based on the polymer, of structural components —O—C x R y —O— when x =1−3.
3. Drive belt of claim 1 or 2 , wherein the elastic addition polymer is a polyurethane which is based on polyalcohols having the structure —O—C x R y —O— wherein 4≦x≦20, y=040 and R is selected from hydrogen and carbon-containing groups.
4. Drive belt of claim 3 , wherein the elastic addition polymer is a polyurethane which is based on polyalcohols having the structure —O—C x R y —O— wherein x=6.
5. Drive belt of claim 1 or 2 , wherein the elastic addition polymer is a polyurea.
6. Drive belt of claim 5 , wherein the elastic addition polymer is a polyurea which is based on polyamines having the structure —NR 2 —C x R 1 y —NR 2 — with x≦4 and y≦0 and the R 1 and R 2 can be the same or different in a structural component and are selected from hydrogen and/or carbon-containing groups.
7. Drive belt of claim 1 or 2 , wherein the matrix of at least one elastic addition polymer contains polyurethane and polyurea.
8. Drive belt of claim 1 , wherein the friction-reducing material is a fluoropolymer powder.
9. Drive belt of claim 8 , wherein the fluoropolymer is polytetrafluoroethylene.
10. Drive belt of claim 1 , wherein the friction-reducing material is present in the matrix in quantities of 40 to 60% by weight.
11. Drive belt of claim 1 , wherein the belt is a rubber toothed belt.
12. Drive belt of claim 11 , wherein the surface protective textile reinforcement is a -6,6-polyamide stretch fabric on the belt teeth.
13. Drive belt of claim 12 , wherein the fabric in the land region of the belt teeth is provided with 50 to 600 g/m 2 of surface coating.
14. Drive belt of claim 12 , wherein the fabric in the land region of the belt teeth is provided with 150 to 400 g/m 2 of surface coating.