Power transmission belt, in particular toothed belt, and method for the production thereof
A power transmission belt ( 20 ) having an elastic main body ( 17 ) includes a top layer as the belt backing and a bottom section having a power transmission zone. The power transmission zone and/or the top layer has/have a coating ( 15, 16 ), characterized in that the coating ( 15, 16 ) of the power transmission zone and/or the top layer includes at least the following layer construction: a base coating ( 18 ) made of a textile material, wherein the base coating ( 18 ) forms a bond with the elastic main body ( 17 ) and has a surface coating ( 19 ) including at least a mixture A, which contains at least one reactive diluent as per DIN 55945:2007-03. The invention further relates to a method for producing such a power transmission belt. The novel coating concept is applicable in particular in a toothed belt.
1. A force transmission belt having an elastic foundational body, comprising a top ply as belt backing and a substructure having a force transmission zone, wherein the force transmission zone and/or the top ply is/are provided with a coating,
wherein the coating on the force transmission zone and/or the top ply has at least the following layered construction:
a base coating of a textile material, wherein the base coating combines with the elastic foundational body to form a bonded assembly, and
a surface coating comprising a mixture A containing at least a reactive diluent as per DIN 55945:2007-03.
2. The force transmission belt as claimed in claim 1 , wherein the base coating is a woven or knitted fabric.
3. The force transmission belt as claimed in claim 1 , wherein the reactive diluent as per DIN 55945:2007-03 is selected from the group consisting of methacrylates, acrylates, vinyl ethers, and glycidyl ethers, or a mixture thereof.
4. The force transmission belt as claimed in claim 3 , wherein the reactive diluent as per DIN 55945:2007-03 is selected from the group consisting of methacrylates and acrylates, or a mixture thereof.
5. The force transmission belt as claimed in claim 1 , wherein the mixture A comprises from 2% to 90% by weight of a reactive diluent as per DIN 55945:2007-03.
6. The force transmission belt as claimed in claim 1 , wherein the mixture A further comprises at least one of a crosslinking agent and a pulverulent gliding body.
7. The force transmission belt according to claim 1 , wherein the surface coating further comprises a second mixture B composed of at least an isocyanate and/or at least a polyol.
8. The force transmission belt according to claim 7 , wherein the ratio of the mixture A to the second mixture B is in the range from 7:1 to 1:1.
9. The force transmission belt according to claim 1 , being configured as a toothed belt.
10. A process for producing a force transmission belt having an elastic foundational body, comprising a top ply as belt backing and a substructure having a force transmission zone wherein the force transmission zone and/or the top ply is provided with a coating, the process comprising:
coating the force transmission zone and/or the top ply of the still unvulcanized belt blank with a base coating of textile material;
subsequently applying to the base coating a surface coating comprising a mixture A comprising at least a reactive diluent as per DIN 55945:2007-03 to form an overall coating;
vulcanizing the belt blank provided with the overall coating to form a bonded assembly of the elastomeric foundational body and the base coating.
11. The process as claimed in claim 10 , wherein the mixture A further comprises at least one of a crosslinking agent and a pulverulent gliding body.
12. The process as claimed in claim 10 , wherein the surface coating further comprises a second mixture B composed of at least an isocyanate and/or at least a polyol.
13. The process as claimed in claim 10 for producing a toothed belt.