High abrasion resistance hose cover
Hoses include inner tube, a reinforcement layer disposed outwardly from the inner tube, and a cover layer disposed outwardly from the reinforcement layer, and the cover layer and/or inner tube is based on a cured composition formed from a mixture containing a blend of chlorinated polyethylene (CPE) and cross-linkable oxidized high density polyethylene (oxidized HDPE), where the CPE and oxidized HDPE are blended in a CPE:oxidized HDPE weight ratio of from 10:1 to 1:1, and a peroxide curing system. The peroxide curing system used in some compositions according the disclosure include alpha-alpha-bis(t-butylperoxy)diisopropylbenzene and trimethylolpropane trimethacrylate.
1 . A hose comprising:
an inner tube,
a reinforcement layer disposed outwardly from the inner tube, and
a cover layer disposed outwardly from the reinforcement layer;
wherein the cover layer comprises a cured composition formed from a mixture comprising:
a) a blend of chlorinated polyethylene (CPE) and cross-linkable oxidized high density polyethylene (oxidized HDPE), wherein the CPE and the oxidized HDPE are blended in a CPE:oxidized HDPE weight ratio of from 10:1 to 1:1; and,
b) a peroxide curing system.
2 . The hose according to claim 1 , wherein the cured composition has a DIN abrasion resistance value of 70 or less.
3 . The hose according to claim 1 , the cover layer further comprising antimony trioxide.
4 . The hose according to claim 1 , wherein the peroxide curing system comprises alpha-alpha-bis(t-butylperoxy)diisopropylbenzene and trimethylolpropane trimethacrylate.
5 . The hose according to claim 4 , wherein the alpha-alpha-bis(t-butylperoxy)diisopropylbenzene is incorporated in an amount of from 4 phr to 8 phr, and wherein the trimethylolpropane trimethacrylate is incorporated in an amount of from 3 phr to 6 phr.
6 . The hose according to claim 1 , wherein the CPE:oxidized HDPE weight ratio is of from 7:1 to 3:1.
7 . The hose according to claim 1 , wherein the inner tube comprises a cured composition formed from a mixture comprising a blend of chlorinated polyethylene (CPE) and cross-linkable oxidized high density polyethylene (oxidized HDPE), wherein the CPE and oxidized HDPE are blended in a CPE:oxidized HDPE weight ratio of from 10:1 to 1:1.
8 . The hose according to claim 1 , wherein the cover layer further comprises from 10 to 70 phr of fillers selected from one or more of carbon black, calcium carbonate, talc, clay, and hydrated silica.
9 . The hose according to claim 1 , wherein the cover layer further comprises from 0.5 phr to 1.5 phr of an antiozonant or antioxidant, and from 5 phr to 15 phr of a paraffinic petroleum oil plasticizer.
10 . The hose according to claim 1 , wherein the hose consists of: the inner tube, the reinforcement layer, and the cover layer, and wherein the cover layer is a single layer.
11 . The hose according to claim 1 , wherein the cover layer has a thickness of from 0.059 inches to 0.098 inches.
12 . The hose according to claim 1 , wherein the peroxide curing system comprises one or more coagents selected from the group consisting of trimethylolpropane triacrylate (TMPTA), ethylene glycol dimethacrylate (EGDMA), ethylene glycol diacrylate (EGDA), N,N′-m-phenylene dimaleimide (PDM), zinc diacrylate (ZDA), zinc dimethacrylate (ZDMA), triallyl cyanurate (TAC), triallyl isocyanurate (TAIC), 90% vinyl poly(butadiene) (HVPBd), and 70% vinyl styrene-butadiene copolymer (HVSBR).
13 . The hose according to claim 1 , wherein the cross-linkable oxidized HDPE:
has a minimum number average molecular weight above 1200 as determined by high temperature vapor pressure osmometry,
comprises between 1 and 5 percent by weight of total oxygen, and
has an acid number of from 10 to 35.
14 . The hose according to claim 1 , wherein the oxidized HDPE is produced by oxidizing polyethylene when the polyethylene is in a molten or finely divided solid form, with free oxygen containing gas, at a temperature greater than 100° C.