Airspring
The present invention is directed to an airspring having an airsleeve comprising an elastomeric liner; a reinforcing layer overlaying the liner; and an elastomeric cover overlaying the reinforcing layer; the cover made from an a vulcanizable elastomeric composition comprising: 100 parts by weight of elastomer comprising from about 30 to about 50 parts by weight of natural rubber, from about 10 to about 30 parts by weight of polybutadiene, and from about 30 to about 50 parts by weight of ethylene propylene diene terpolymer (EPDM); from about 20 to about 60 parts by weight, per 100 parts by weight of elastomer, of silica; from about 1 to about 10 parts by weight, per 100 parts by weight of elastomer, of an organosilane polysulfide; from about 1 to 10 parts by weight, per 100 parts by weight of elastomer, of an organic peroxide; and from about 0.1 to about 40 parts by weight, per 100 parts by weight of elastomer, of a crosslinking coagent.
1 . An airspring having an airsleeve comprising an elastomeric liner; a reinforcing layer overlaying the liner; and a colorable elastomeric cover overlaying the reinforcing layer; the cover made from a vulcanizable elastomeric composition comprising:
100 parts by weight of elastomer comprising from about 30 to about 50 parts by weight of natural rubber, from about 10 to about 30 parts by weight of polybutadiene, and from about 30 to about 50 parts by weight of ethylene propylene diene terpolymer (EPDM);
from about 20 to about 60 parts by weight, per 100 parts by weight of elastomer, of silica;
from about 1 to about 10 parts by weight, per 100 parts by weight of elastomer, of an organosilane polysulfide;
from about 1 to about 10 parts by weight, per 100 parts by weight of elastomer, of an organic peroxide; and
from about 0.1 to about 40 parts by weight, per 100 parts by weight of elastomer, of a crosslinking coagent.
2 . The airspring of claim 1 , wherein the vulcanizable elastomeric composition further comprises from about 1 to about 5 parts by weight, per 100 parts by weight of elastomer, of triethanolamine.
3 . The airspring of claim 1 , wherein the vulcanizable elastomeric composition further comprises from 0.1 to 8 parts by weight, per 100 parts by weight of elastomer, of a sulfur vulcanizing agent.
4 . The airspring of claim 1 , wherein the vulcanizable elastomeric composition further comprises at least one colorant.
5 . The airsleeve of claim 1 , wherein the vulcanizable elastomeric composition further comprises at least one colorant selected from organic dyes, inorganic dyes, organic pigments, and inorganic pigments, and carbon black.
6 . The airspring of claim 1 , the reinforcing layer comprising: textile fibers having distributed over surface portions thereof an RFL adhesive; and a vulcanizable plycoat rubber composition.
7 . The airspring of claim 6 , wherein said textile fiber are selected from the group consisting of woven fabrics, knitted fabric, or spun bonded fabric, and fiber cord.
8 . The airspring of claim 6 , wherein said textile fibers comprises a material selected from the group consisting of rayon, nylon, polyester, aramid, cotton, and combinations thereof.
9 . The airspring of claim 6 , wherein textile fibers comprises nylon.
10 . The airspring of claim 1 wherein said airspring is selected from shock absorbers, struts, truck cab suspension springs, truck driver seat springs, automobile airsprings, and industrial airsprings.
11 . The airspring of claim 1 wherein the cover is exclusive of staining or coloring antioxidants and antiozonants.
12 . The airspring of claim 6 , wherein said RFL comprises resorcinol, formaldehyde, and at least one polymer selected from styrene-butadiene copolymer and vinylpyridene-styrene-butadiene terpolymer.
13 . The airspring of claim 1 , wherein the airspring is a bellows type airspring.
14 . The airspring of claim 1 , wherein the airspring is a rolling lobe airspring.
15 . The airspring of claim 1 , wherein the coagent is selected from the group consisting of organic acrylates, organic methacrylates, divinyl esters, divinyl benzene, bis-maleimides, triallylcyanurates, polyalkyl ethers and esters, metal salts of an alpha-beta unsaturated organic acid and mixtures thereof.
16 . The airspring of claim 1 , wherein the coagent is zinc diacrylate or zinc dimethacrylate.
17 . The airspring of claim 1 , wherein the coagent is present in an amount ranging from 1 to 10 parts by weight per 100 parts by weight of elastomer.
18 . The airspring of claim 6 , wherein the plycoat rubber composition comprises at least one elastomer selected from the group consisting of epichlorohydrin rubber, polyisobutylene, halogenated butyl rubbers, natural rubber, polyisoprene, polybutadiene, styrene-butadiene, polychloroprene, and ethylene propylene diene rubber (EPDM).