Composition for rubber bushing having vibration isolation and fatigue endurance characteristics
A rubber bushing composition and an automotive bushing manufactured by molding the composition are provided. The rubber bushing composition has advanced vibration isolation and fatigue endurance conflicting with each other.
1. A rubber bushing composition comprising:
100 parts by weight of natural rubber;
20 to 30 parts by weight of a fast extruding furnace (FEF), a high abrasion furnace (HAF), or a mixture thereof as a filler;
0.5 to 1.5 parts by weight of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ) and 1 to 2 parts by weight of N-isopropyl-N′-phenyl-p-phenylenediamine (IPPD) as an antioxidant;
0.8 to 1.5 parts by weight of a sulfur crosslinker;
0.5 to 2 parts by weight of N-cyclohexyl 2-benzothiazole sulfenamide (CBS) and 0.2 to 1 part by weight of tetramethylthiuram disulfide (TMTD) as a crosslinking accelerator; and
3 to 5 parts by weight of zinc oxide and 1.5 to 3 parts by weight of stearic acid as a crosslinking activator.
2. The rubber bushing composition of claim 1 , wherein a weight ratio of the sulfur crosslinker to the crosslinking accelerator is in a range of 0.4 to 0.7.
3. The rubber bushing composition of claim 1 , wherein the antioxidant further comprises a paraffin-based ozone antioxidant.
4. The rubber bushing composition of claim 3 , wherein the rubber bushing composition comprises 1 to 2 parts by weight of the paraffin-based ozone antioxidant.
5. The rubber bushing composition of claim 1 , wherein the rubber bushing composition comprises 1 to 2 parts by weight of CBS.
6. The rubber bushing composition of claim 5 , wherein the rubber bushing composition comprises 0.2 to 0.8 parts by weight of TMTD.
7. The rubber bushing composition of claim 1 , wherein the rubber bushing composition comprises 0.2 to 0.8 parts by weight of TMTD.
8. The rubber bushing composition of claim 1 , wherein a shore A hardness of the rubber bushing composition is in a range of 45 to 55 Hs.
9. The rubber bushing composition of claim 1 , wherein the filler comprises FEF.
10. The rubber bushing composition of claim 9 , wherein the FEF is N550 carbon black.
11. The rubber bushing composition of claim 9 , wherein the FEF has a density of 20 to 24 lb/ft 3 .
12. The rubber bushing composition of claim 9 , wherein the FEF has a process oil content of 115 to 127 cm 3 /100 g.
13. The rubber bushing composition of claim 1 , wherein the filler comprises HAF.
14. The rubber bushing composition of claim 13 , wherein the HAF is a N330 carbon black.
15. The rubber bushing composition of claim 1 , wherein a total amount of the crosslinking accelerator is 1.8 to 2.2 parts by weight.
16. An automotive bushing component comprising:
a rubber composition having:
100 parts by weight of natural rubber;
20 to 30 parts by weight of a fast extruding furnace (FEF), a high abrasion furnace (HAF), or a mixture thereof as a filler;
0.5 to 1.5 parts by weight of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ) and 1 to 2 parts by weight of N-isopropyl-N′-phenyl-p-phenylenediamine (IPPD) as an antioxidant;
0.8 to 1.5 parts by weight of a sulfur crosslinker;
0.5 to 2 parts by weight of N-cyclohexyl 2-benzothiazole sulfenamide (CBS) and 0.2 to 1 part by weight of tetramethylthiuram disulfide (TMTD) as a crosslinking accelerator; and
3 to 5 parts by weight of zinc oxide and 1.5 to 3 parts by weight of stearic acid as a crosslinking activator.
17. The automotive bushing component of claim 16 , wherein the bushing component is selected from a group consisting of a suspension, a stabilizer, and a subframe.