Thermoplastic elastomer composition and use thereof
It is the aim to indicate a thermoplastic elastomer composition which is characterized by particularly good temperature stability from −40° C. to +150° C. and a particularly good oil resistance, with particularly good physical properties, in particular with a high elongation at break, and which is suitable for use in moldings, injection moldings, extrudates and/or blow moldings. In addition, the thermoplastic elastomer composition according to the invention comprises a mixture of acrylate rubber and polyurethane.
1. A thermoplastic elastomer composition comprising a mixture of an acrylate rubber and a polyurethane, wherein the mixture is formed by simultaneously crosslinking and mixing a melt consisting essentially of the acrylate rubber with the polyurethane, a weight ratio of the acrylate rubber to the polyurethane is 8:2 to 5:5, the acrylate rubber is distributed homogeneously in a matrix of the polyurethane, a tensile strength of the thermoplastic elastomer composition after storage for 70 hours at 150° C. in the presence of oil measured in accordance with DIN 53504-S2 is from 3 to about 6.5 MPa, and the acrylate rubber comprises one of ethyl acrylate (EA), butyl acrylate (BA), and methoxyethyl acrylate (MEA).
2. The thermoplastic elastomer composition as claimed in claim 1 , wherein the acrylate rubber has functional groups selected from halogen-containing groups, carboxylic acid groups, hydroxy groups, epoxy groups, and mixtures thereof.
3. The thermoplastic elastomer composition as claimed in one claim 1 , wherein the polyurethane is produced by reacting a diisocyanate with a polyol and a chain extension agent.
4. The thermoplastic elastomer composition as claimed in claim 3 , wherein the polyol is selected from polyester polyols, polylactone polyols, polyether polyols, polythioether polyols, polyester amide polyols, polycarbonate polyols, polyacetal polyols, vinyl polymer polyols, polycaprolactone polyols, polyether glycols, polyester glycols, and mixtures thereof.
5. The thermoplastic elastomer composition as claimed in claim 3 , wherein the chain extension agent is selected from diols, trifunctional or higher functional alcohols, diamines, higher functional amines, amino alcohols, and mixtures thereof.
6. The thermoplastic elastomer composition as claimed in claim 1 , wherein a crosslinking agent is used for crosslinking the acrylate rubber, and wherein the crosslinking agent is a member selected from the group consisting of: peroxides; sulfur; diamines; polyamines; diamine carbamates; diols; polyols; diisocyanates; polyisocyanates; diepoxides; polyepoxides; diglycidyl ethers; triazines; methylenedianiline; dicarboxylic acids; polycarboxylic acids; substances which release peroxides, sulfur, diamines, polyamines, diamine carbamates, diols, polyols, diisocyanates, polyisocyanates, diepoxides, polyepoxides, diglycidyl ethers, triazines, methylenedianiline, dicarboxylic acids, or polycarboxylic acids; and mixtures thereof.
7. The thermoplastic elastomer composition as claimed in claim 1 , wherein the thermoplastic elastomer composition comprises at least one additive which is selected from fillers, plasticizers, processing aids, anti-aging agents, antioxidants, flame retardants, dyes, pigments, and mixtures thereof.
8. The thermoplastic elastomer composition as claimed in claim 1 , wherein an operating-temperature of the thermoplastic elastomer composition is in the range from −40° C. to +150° C.
9. The thermoplastic elastomer composition as claimed in claim 1 , wherein a residual elongation of the thermoplastic elastomer composition at break after storage for 70 hours at 150° C. in the presence of oil (IRM 903) measured in accordance with DIN 53504-S2 is between 100% and 160%.
10. The thermoplastic elastomer composition as claimed in claim 1 , wherein a hardness of the thermoplastic elastomer composition measured in accordance with DIN 53505 is 60 to 100 Shore A.
11. The thermoplastic elastomer composition as claimed in claim 1 , wherein a volume change of the thermoplastic elastomer composition in oil (IRM 903) measured in accordance with DIN ISO 1817 is less than 15%.
12. The thermoplastic elastomer composition as claimed in claim 1 , wherein a tear-propagation resistance of the thermoplastic elastomer composition measured in accordance with ISO 34-1 Method A is in a range from 1 to 20 N/mm.
13. The thermoplastic elastomer composition as claimed in claim 1 , wherein the thermoplastic elastomer composition is suitable for producing at least one of moldings, injection moldings, extrudates, and blow moldings.