Belt using high performance cost-effective elastomeric material
A belt body has an outer surface and an inner facing toothed surface and includes or is comprised of an elastomeric composition; and tensile members. The elastomeric composition including: from about 50 to 90 parts per hundred rubber of a zinc diacrylate modified hydrogenated acrylonitrile-butadiene rubber, and/or an unmodified hydrogenated acrylonitrile-butadiene rubber; from about 10 to 50 parts per hundred rubber of a peroxide curable polyepichlorohydrin copolymer or terpolymer; wherein the elastomeric composition is cured using a free radical promoting material, wherein the free radical promoting material is a peroxide selected from the group consisting of diacyl peroxides, peroxyesters, dialkyl peroxides and peroxyketals and is used in an amount from about 0.5 to 7 parts per hundred rubber, and wherein the peroxide co-agent is selected from the group consisting of 1, 2 polybutadienes, organic acrylates, organic methacrylates, metal salts of an alpha, beta-unsaturates organic acid and mixtures thereof and is used in an amount from about 2 to about 10 parts per hundred rubber.
1. A timing belt comprising:
a belt body having an outer surface and an inner facing toothed surface and comprised of an elastomeric composition;
tensile members;
the elastomeric composition comprising:
from about 50 to 90 parts per hundred rubber of a zinc diacrylate modified hydrogenated acrylonitrile-butadiene rubber, and/or an unmodified hydrogenated acrylonitrile-butadiene rubber;
from about 10 to 50 parts per hundred rubber of a peroxide curable polyepichlorohydrin copolymer or terpolymer;
wherein the elastomeric composition is cured using a free radical promoting material, wherein the free radical promoting material is a peroxide selected from the group consisting of diacyl peroxides, peroxyesters, dialkyl peroxides and peroxyketals and is used in an amount from about 0.5 to 7 parts per hundred rubber, and
wherein the composition includes a peroxide co-agent is selected from the group consisting of 1, 2 polybutadienes, organic acrylates, organic methacrylates, metal salts of an alpha, beta-unsaturates organic acid and mixtures thereof, which is used in an amount from about 2 to about 10 parts per hundred rubber.
2. The timing belt of claim 1 , wherein the elastomeric composition includes from about 50 to 70 parts per hundred rubber of a zinc diacrylate modified hydrogenated acrylonitrile-butadiene rubber, and/or an unmodified hydrogenated acrylonitrile-butadiene rubber; and
from about 30 to 50 parts per hundred rubber of a peroxide curable polyepichlorohydrin copolymer or terpolymer.
3. The timing belt of claim 1 , the timing belt comprises an inner-facing surface having a row of adjacent teeth, the row of teeth comprising the elastomeric composition.
4. The timing belt of claim 3 , the adjacent teeth having more parts per hundred rubber of a zinc diacrylate modified hydrogenated acrylonitrile-butadiene rubber, and/or an unmodified hydrogenated acrylonitrile-butadiene rubber than a belt body of the belt.
5. The timing belt of claim 3 , the adjacent teeth having less parts per hundred rubber of a zinc diacrylate modified hydrogenated acrylonitrile-butadiene rubber, and/or an unmodified hydrogenated acrylonitrile-butadiene rubber than a belt body of the belt.
6. The timing belt of claim 1 , wherein the elastomeric composition further comprising: from 10 phr to 80 phr of a carbon black.
7. The timing belt of claim 6 , wherein the elastomeric composition further comprising: up to 20 phr of precipitated silica.
8. The timing belt of claim 7 , wherein the elastomeric composition further comprising: up to 20 phr of plasticizer selected from the group consisting of ethers, esters, polyester, and phosphate.
9. The timing belt of claim 1 , wherein the elastomeric composition further comprising ZDA and/or ZDMA added to compound for unmodified HNBRs from 5 to 30 phr.
10. The timing belt of claim 8 , wherein the elastomeric composition further comprising from about 1 to 4 phr of an antioxidant or antioxidant combination, selected from the group consisting of (zinc) 2-mercaptotolyimidazole, alkylated diphenylamines, phenyl-α-naphthylamine, alkylated phenyl-α-naphthylamine, dimethyl quinolines, trimethyldihydroquinolines and oligomeric compositions derive therefrom, hindered phenolics, alkylated hydroquinones, hydroxylated thiodiphenyl ethers, alkylidenebisphenols, thiopropionates, metallic dithiocarbamates, 1,3,4-domercaptothiadiazole and derivitives, and oil soluble copper compounds.
11. The timing belt of claim 10 , wherein the elastomeric composition includes from about 50 to 70 parts per hundred rubber of a zinc diacrylate modified hydrogenated acrylonitrile-butadiene rubber, and/or an unmodified hydrogenated acrylonitrile-butadiene rubber; and
from about 30 to 50 parts per hundred rubber of a peroxide curable polyepichlorohydrin copolymer or terpolymer.
12. The timing belt of claim 1 , wherein the elastomeric composition includes from about 50 to 60 parts per hundred rubber of a zinc diacrylate modified hydrogenated acrylonitrile-butadiene rubber, and/or an unmodified hydrogenated acrylonitrile-butadiene rubber; and
from about 40 to 50 parts per hundred rubber of a peroxide curable polyepichlorohydrin copolymer or terpolymer.