Blended rubber, blended rubber composition and vulcanizate
Provided are a blended rubber and a blended rubber composition that give a vulcanizate superior in abrasion resistance and ozone resistance, and a vulcanizate prepared by vulcanizing the blended rubber composition. A blended rubber, comprising 30 to 93 mass % of a chloroprene rubber, 5 to 50 mass % of a soft polyvinyl chloride, and 2 to 20 mass % of an acrylonitrile-butadiene rubber. The polyvinyl chloride resin used preferably has a polymerization degree of 300 to 3000 and the acrylonitrile-butadiene rubber preferably has an acrylonitrile content of 18 to 50 mass %.
1. A blended rubber, comprising
30 to 93 mass % of a chloroprene rubber,
5 to 50 mass % of a soft polyvinyl chloride obtained by plasticizing a polyvinyl chloride with a plasticizer, and
2 to 20 mass % of an acrylonitrile-butadiene rubber.
2. The blended rubber according to claim 1 , wherein the polyvinyl chloride has a polymerization degree of 300 to 3000.
3. The blended rubber according to claim 1 , wherein the soft polyvinyl chloride is obtained by plasticizing 100 parts by mass of the polyvinyl chloride with 30 to 150 parts by mass of the plasticizer.
4. The blended rubber according to claim 1 , wherein the plasticizer is at least one compound selected from phthalic ester-, adipic acid-, chlorinated paraffin-, sebacic acid-, polyester-, phosphate ester-, polyether ester-, and trimellitic acid-based plasticizers.
5. The blended rubber according to claim 1 , wherein the acrylonitrile-butadiene rubber contains acrylonitrile at a rate of 18 to 50 mass %.
6. A blended rubber composition, comprising the blended rubber according to claim 1 and
a vulcanization accelerator.
7. The blended rubber composition according to claim 6 , comprising the vulcanization accelerator in an amount of 0.5 to 5 parts by mass with respect to 100 parts by mass of the blended rubber.
8. The blended rubber composition according to claim 6 , wherein the vulcanization accelerator is at least one compound selected from thiourea compounds, guanidine compounds, thiuram compounds, thiazole compounds, and peroxides.
9. The blended rubber composition according to claim 8 , wherein the vulcanization accelerator contains a thiuram compound and a thiazole compound.
10. A vulcanizate obtained by vulcanizing the blended rubber composition according to claim 6 .
11. The blended rubber according to claim 2 , wherein the plasticizer is at least one compound selected from phthalic ester-, adipic acid-, chlorinated paraffin-, sebacic acid-, polyester-, phosphate ester-, polyether ester-, and trimellitic acid-based plasticizers.
12. The blended rubber according to claim 3 , wherein the plasticizer is at least one compound selected from phthalic ester-, adipic acid-, chlorinated paraffin-, sebacic acid-, polyester-, phosphate ester-, polyether ester-, and trimellitic acid-based plasticizers.
13. The blended rubber according to claim 2 , wherein the acrylonitrile-butadiene rubber contains acrylonitrile at a rate of 18 to 50 mass %.
14. The blended rubber according to claim 3 , wherein the acrylonitrile-butadiene rubber contains acrylonitrile at a rate of 18 to 50 mass %.
15. The blended rubber according to claim 4 , wherein the acrylonitrile-butadiene rubber contains acrylonitrile at a rate of 18 to 50 mass %.
16. A blended rubber composition, comprising the blended rubber according to claim 2 and a vulcanization accelerator.
17. A blended rubber composition, comprising the blended rubber according to claim 3 and a vulcanization accelerator.
18. A blended rubber composition, comprising the blended rubber according to claim 4 and a vulcanization accelerator.
19. A blended rubber composition, comprising the blended rubber according to claim 5 and a vulcanization accelerator.
20. A vulcanizate obtained by vulcanizing the blended rubber composition according to claim 7 .