1. A method of making manufactured articles having resistance to vapour at high temperatures, of fluoroelastomeric or perfluoroelastomeric compositions curable by peroxidic way, comprising combining for 100 phr of fluoroelastomer or perfluoroelastomer:
as filler, from 2 to 70 phr of carbon black having surface area CTAB (ASTM D 3765) between 25 and 35 m2g;
as crosslinking agent, from 0.5 to 10 phr of a bis-olefin having general formula;
wherein:
R1, R2, R3, R4, R5, R6, equal to or different from each other, are H or C1-C5 alkyls;
Z is selected between a C1-C18 linear or branched alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a fluoropolyoxyalkylene or perfluoropolyoxyalkylene radical.
2. The method according to claim 1, wherein in the (per)fluoroelastomeric fluoroelastomeric or perfluoroelastomeric composition the carbon black ranges from 5 to 50 phr.
3. The method according to claim 1, wherein in the fluoroelastomeric or perfluoroelastomeric composition the bis-olefin ranges from 0.6 to 5 phr.
4. The method according to claim 1, wherein in formula (I) Z is a C4-C12, perfluoroalkylene radical and R1, R2, R3, R4, R5, R6 are hydrogen; when Z is a fluoropolyoxyalkylene or perfluoropolyoxyalkylene radical, it comprises units selected from the following \u2014CF2CF2O\u2014, \u2014CFX1O\u2014, \u2014CF2\u2014CH2CH2O\u2014, and \u2014C3F6O\u2014, wherein X1=F, CF3.
5. The method according to claim 4, wherein Z has formula:
-(Q)p\u2014CF2O\u2014(CF2CF2O)m(CF2O)n\u2014CF2-(Q)p-\u2003\u2003(II)
wherein: Q is a C1-C10 alkylene or oxyalkylene radical; p is 0 or 1; m and n are numbers such that the mn ratio is between 0.2 and 5 and the molecular weight of said fluoropolyoxyalkylene or perfluoropolyoxyalkylene radical is in the range 300-10,000.
6. The method according to claim 5, wherein Q is selected from:
\u2014CH2OCH2\u2014; \u2014CH2O(CH2CH2O)sCH2\u2014, s being =1-3.
7. The method according to claim 4, wherein the bis-olefin has formula:
CH2\u2550CH\u2014(CF2)t0-CH\u2550CH2
wherein t0 is an integer from 6 to 10.
8. The method according to claim 1, wherein the fluoroelastomers or perfluoroelastomers contain peroxidic crosslinking sites.
9. The method according to claim 8, wherein peroxidic crosslinking sites are iodine andor bromine atoms.
10. The method according to claim 8, wherein the iodine andor bromine amount is between 0.001% and 5% by weight, with respect to the total weight of the polymer.
11. The method according to claim 8, wherein in the fluoroelastomers or perfluoroelastomers the iodine andor bromine atoms are in the chain andor in end position.
12. The method according to claim 8, wherein the fluoroelastomers or perfluoroelastomers are TFE copolymers with at least one per-fluorinated olefin having one unsaturation of ethylene type.
13. The method according to claim 12, wherein in the fluoroelastomers or perfluoroelastomers the comonomer is selected from:
fluoroalkylvinylethers or perfluoroalkylvinylethers (PAVE) CF2\u2550CFOR2f, wherein R2f is a C1-C6 fluoroalkyl or perfluoroalkyl;
fluoro-oxyalkylvinylethers or perfluoro-oxyalkylvinylethers CF2\u2550CFOX0, wherein X0 is a C1-C12 perfluorooxyalkyl, containing one or more ether groups;
fluorovinylethers or perfluorovinylethers (MOVE) having general formula:
CFX2\u2550CX2OCF2OR\u2033f\u2003\u2003(I-B)
wherein
R\u2033f has the following meanings:
C1-C6 linear or branched fluoroalkyl or perfluoroalkyl,
C5-C6 cyclic (per)fluoroalkyl or perfluoroalkyl,
C2-C6 linear or branched fluorooxyalkyl or perfluorooxyalkyl containing from one to three oxygen atoms,
X2=F, H.
14. The method according to claim 12, wherein the fluoroelastomers or perfluoroelastomers have the following compositions, expressed as % by moles:
TFE 50-85%, PAVE 15-50%;
TFE 20-85%, MOVE 15-80%, optionally PAVE 0-50%;
the sum of the monomers being 100% by moles.
15. The method according to claim 12, wherein the fluoroelastomers or perfluoroelastomers contain units deriving from VDF, C3-C8 fluoroolefins, optionally containing hydrogen atoms, chlorine andor bromine andor iodine, C2-C8 non fluorinated olefins (OI).
16. The method according to claim 15, wherein the fluoroelastomers or perfluoroelastomers have the following compositions:
33-75% by moles of tetrafluoroethylene (TFE), 15-45% by moles of a perfluorovinylether (PAVE), 2-25% by moles of vinylidene fluoride (VDF);
TFE 32-60%, PAVE 20-40%; OI 10-40%;
the sum of the moles of the compositions being 100%.
17. The method according to claim 1, wherein the fluoroelastomeric or perfluoroelastomeric composition comprises other components selected from:
a metal compound, in an amount between 0% and 15% by weight with respect to the polymer, selected from divalent metal oxides or hydroxides optionally associated to a weak acid salt;
reinforcing fillers, pigments, antioxidants, stabilizers.
18. The method according to claim 17, wherein the reinforcing fillers are selected from barium sulphate, silicates, semicrystalline fluoropolymers or perfluoropolymers.
19. The method according to claim 1, wherein the fluoroelastomers or perfluoroelastomers are in admixture with a semicrystalline fluoropolymer or perfluoropolymer in an amount, as per cent by weight referred to the total dry weight (per)fluoroelastomer+semicrystalline fluoropolymer or perfluoropolymer , from 0% to 70%.
20. The method according to claim 19, wherein the semicrystalline fluoropolymer or perfluoropolymer is constituted by tetrafluoroethylene (TFE) homopolymers, or TFE copolymers with one or more monomers containing at least one unsaturation of ethylene type, in an amount from 0.01% to 10% by moles, said comonomers with one ethylene unsaturation being both of hydrogenated and fluorinated type.
21. The method according to claim 19, wherein the hydrogenated comonomers are selected from ethylene, propylene, acrylic monomers, styrene monomers.
22. The method according to claim 19, wherein the fluorinated comonomers are selected from the following:
C3-C8 perfluoroolefins;
C2-C8 hydrogenated fluoroolefins; perfluoroalkylethylene CH2\u2550CH\u2014Rf, wherein Rf is a C1-C6 perfluoroalkyl;
C2-C8 chloro- andor bromo- andor iodo-fluoroolefins;
fluoroalkylvinylethers or perfluoroalkylvinylethers (PAVE) CF2\u2550CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl;
fluoro-oxyalkylvinylethers or perfluoro-oxyalkylvinylethers CF2\u2550CFOX, wherein X is a C1-C12 alkyl, or a C1-C12 oxyakyl, or a C1-C12 (per)fluoro-oxyalkyl or (per)fluoro-oxyalkyl having one or more ether groups;
(per)fluorodioxoles, preferably perfluorodioxoles.
23. Fluoroelastomeric or perfluoroelastomeric compositions according to claim 1.
24. Manufactured articles obtainable from the curable (per)fluoroelastomeric compositions according to claim 1.
25. Cured fluoroelastomeric or perfluoroelastomeric compositions obtainable from the curable fluoroelastomeric or perfluoroelastomeric compositions according to claim 1.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An on-board lubrication assembly improvement in combination with a piston paint pump having a non-hydraulic powered paint pumping piston reciprocating in a bushing, the assembly improvement comprising:
a lubricant reservoir located internal to a housing of the pump having an inlet and an outlet;
an actuator extending exterior of the housing for manual activation by a user; and
a lubricant dispensing mechanism having a lubricant delivery piston received within a cylinder, the lubricant delivery piston movable in response to manual actuation of the actuator, the lubricant dispensing mechanism including an inlet connected to the outlet of the reservoir and having an outlet connected to deliver a predetermined repeatable amount of lubricant to the paint pumping piston adjacent the bushing when the user manually actuates the actuator.
2. The assembly of claim 1 wherein the lubrication assembly further comprises:
an inlet check valve located between the reservoir and the lubricant dispensing mechanism; and
an outlet check valve located downstream of the cylinder.
3. The assembly of claim 2 wherein the lubricant dispensing mechanism includes a return spring urging the lubricant delivery piston in a first direction in the cylinder, and the lubricant delivery piston is manually movable in a second direction in the cylinder.
4. The assembly of claim 3 wherein the lubricant delivery piston has a portion extending through an aperture in the housing and forming the actuator.
5. The assembly of claim 1 including a breather valve having an umbrella-like flange connected to a stem, the breather valve in fluid communication with the reservoir to prevent creation of a vacuum in the reservoir.
6. The assembly of claim 1 wherein the outlet of the lubricant dispensing mechanism includes an outlet adjacent to and directed at the paint pumping piston proximate the bushing.
7. The assembly of claim 1 further comprising a removable cover providing a liquid seal at the inlet of the lubricant reservoir wherein the cover has a pair of dogs releasable from a pair of cam surfaces in the inlet of the lubricant reservoir.