Natural rubber composition for vehicle

Patent metadata

Field	Value
Publication number	US-10487900-B2
Application number	US-201715704206-A
Country	US
Kind code	B2
Filing date	Sep 14, 2017
Priority date	Nov 24, 2016
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A natural rubber composition includes a natural rubber, a carbon black filler in an amount of 40 phr based on an amount of the natural rubber, a sulfur crosslinking agent in an amount of 1 phr of based on the amount of the natural rubber, and an accelerator to adjust vulcanization physical properties and a dynamic ratio. The accelerator includes a semi-ultra accelerator in an amount of 0.3 to 1 phr based on the amount of the natural rubber, a delayed accelerator in an amount of 1 to 2 phr based on the amount of the natural rubber, and an ultra accelerator in an amount of 0.3 to 1 phr based on the amount of the natural rubber.

First claim

What is claimed is:

1. A natural rubber composition comprising:
a natural rubber;
a carbon black filler in an amount of 40 phr based on an amount of the natural rubber;
a sulfur crosslinking agent in an amount of 1 phr of based on the amount of the natural rubber;
an accelerator comprising:
a first accelerator in an amount of 0.3 to 1 phr based on the amount of the natural rubber, wherein the first accelerator comprises a 2-mercaptobenzothiazole accelerator or a thiazole-based accelerator;
a second accelerator in an amount of 1 to 2 phr based on the amount of the natural rubber, wherein the second accelerator comprises a sulfonamide-based accelerator; and
an third accelerator in an amount of 0.3 to 1 phr based on the amount of the natural rubber, wherein the third accelerator comprises a thiuram-based accelerator.

2. The natural rubber composition of claim 1 , wherein the carbon black filler comprises fast extrusion furnace carbon black (FEF) and semi-reinforcing furnace carbon black (SRF) in a ratio of 3:1 to achieve a reference hardness HS60.

3. The natural rubber composition of claim 1 , wherein the carbon black filler comprises fast extrusion furnace carbon black (FEF) and semi-reinforcing furnace carbon black (SRF) to have a ratio of FEF/SRF greater than 3 to achieve a reference hardness HS60 or less.

4. The natural rubber composition of claim 1 , wherein the carbon black filler comprises fast extrusion furnace carbon black (FEF) and semi-reinforcing furnace carbon black (SRF) to have a ratio of FEF/SRF less than 3 to achieve a reference hardness HS60 or greater.

5. The natural rubber composition of claim 1 , wherein the semi-first accelerator comprises a 2-mercaptobenzothiazole accelerator.

6. The natural rubber composition of claim 1 , wherein the first accelerator comprises a thiazole-based accelerator.

7. The natural rubber composition of claim 6 , wherein the thiazole-based accelerator comprises dibenzothiazol disulfide;
wherein the sulfonamide-based accelerator comprises N-cyclohexyl-2-benzothiazole sulfonamide (CBS) or N-oxydiethylene-2-benzothiazol sulfonamide (NOBS); and
wherein the thiuram-based accelerator comprises tetra methyl thiuram disulfide.

8. The natural rubber composition of claim 1 , wherein the accelerator further comprises a guanidine-based accelerator comprising 1,3-diphenyl guanidine 1,3-diphenyl guanidine in an amount of 0.3 phr or less based on the amount of the natural rubber.

9. The natural rubber composition of claim 1 , further comprising:
an antidegradant in an amount of 5 phr based on the amount of the natural rubber;
an activator in an amount of 4.5 phr based on the amount of the natural rubber; and
a retarder in an amount of 0.1 to 0.5 phr based on the amount of the natural rubber.

10. The natural rubber composition of claim 9 , wherein the retarder comprises poly(vinylimidazole).

11. The natural rubber composition of claim 9 , wherein the antidegradant comprises a material selected from the group consisting of a quinoline-type antidegradant having heat ageing resistance, a wax-type antidegradant having heat ageing resistance, and an antiozonant, and combinations thereof.

12. The natural rubber composition of claim 9 , wherein the activator comprises zinc oxide or stearic acid.

13. The natural rubber composition of claim 12 , wherein the activator comprises zinc oxide and stearic acid in a ratio of 2:1.

14. The natural rubber composition of claim 1 , wherein the natural rubber composition has a Ts2 value of 90 to 150 s.

15. The natural rubber composition of claim 1 , wherein the natural rubber composition has a T90 value of 220 to 300 s.

16. A wheel chassis module of a vehicle, the module comprising:
a strut insulator;
a subframe bush; and
a lower arm G bush;
wherein the subframe bush or the lower arm G bush is formed from a natural rubber composition comprising:
a natural rubber;
a carbon black filler in an amount of 40 phr based on an amount of the natural rubber;
a sulfur crosslinking agent in an amount of 1 phr of based on the amount of the natural rubber;
a first accelerator in an amount of 0.3 to 1 phr based on the amount of the natural rubber, wherein the first accelerator comprises a 2-mercaptobenzothiazole accelerator or a thiazole-based accelerator;
a second accelerator in an amount of 1 to 2 phr based on the amount of the natural rubber, wherein the second accelerator comprises a sulfonamide-based accelerator; and
an third accelerator in an amount of 0.3 to 1 phr based on the amount of the natural rubber, wherein the third accelerator comprises a thiuram-based accelerator.

17. The wheel chassis module of claim 16 , wherein the first-accelerator comprises a 2-mercaptobenzothiazole accelerator.

18. The wheel chassis module of claim 16 , wherein the first-accelerator comprises a thiazole-based accelerator.

19. A wheel chassis module of a vehicle, the module comprising:
a cross member bush;
a deep mount bush; and
a rear lower arm bush;
wherein the cross member bush, the deep mount bush or the rear lower arm bush is formed from a natural rubber composition comprising:
a natural rubber;
a carbon black filler in an amount of 40 phr based on an amount of the natural rubber;
a sulfur crosslinking agent in an amount of 1 phr of based on the amount of the natural rubber;
and an accelerator comprising:
a first accelerator in an amount of 0.3 to 1 phr based on the amount of the natural rubber, wherein the first accelerator comprises a 2-mercaptobenzothiazole accelerator or a thiazole-based accelerator;
a second accelerator in an amount of 1 to 2 phr based on the amount of the natural rubber, wherein the second accelerator comprises a sulfonamide-based accelerator;
and a third accelerator in an amount of 0.3 to 1 phr based on the amount of the natural rubber, wherein the third accelerator comprises a thiuram-based accelerator.

20. The wheel chassis module of claim 19 , wherein the first accelerator comprises a 2-mercaptobenzothiazole accelerator.

21. The wheel chassis module of claim 19 , wherein the first accelerator comprises a thiazole-based accelerator.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Ho Dong
• Jung Heon Seob

Classifications

• B60G2204/128

  Damper mount on vehicle body or chassis · CPC title

• C08K5/435

  Sulfonamides · CPC title

• C08L2666/55

  Carbon · CPC title

• C08L2312/00

  Crosslinking · CPC title

• B60G2204/41

  Elastic mounts, e.g. bushings · CPC title