| 摘要 |
<p>1487060 Improving the bond between RFL adhesive and steel reinforcement elements MONSANTO CO 13 Aug 1976 [15 Aug 1975] 33810/76 Heading B2E An adhesive bond between an RFL organic adhesive and a steel or alloy steel reinforcing element for rubber articles is formed by a process comprising in sequence (a) immersing the steel or alloy steel reinforcing element in an acid- or base-containing aqueous bath for 3 to 25 seconds at 20 to 95‹C, (b) subjecting the element to a water rinse, (c) coating the element with an organosilane of the formula: where X is an amino, glycidoxy or aminoethyl radical and R<SP>1</SP> is an alkylene radical of 2 to 4 carbon atoms when X is an amino or glycidoxy radical and -HN-R<SP>3</SP>-, where R<SP>3</SP> is an alkylene radical having 2 or 3 carbon atoms, when X is an aminoethyl radical and where R<SP>2</SP> is an alkyl radical of 1 or 2 carbon atoms, (d) dipping the element in an RFL organic adhesive and thereafter (e) curing the adhesive on the surface of the element. The coated reinforcing elements are useful in the production of conveyor, heavy duty hoses, pulley belts and pneumatic tyres since an improved adhesion, particularly in moisturecontaining environments, to rubber is obtained. The acid bath may be of an aqueous acid such as sulphuric, nitric, hydrochloric, or phosphoric, which latter is especially preferred. The base-containing bath may be of sodium hydroxide, potassium hydroxide or calcium hydroxide. The acid bath preferably has a pH of 1 to 2.5 and that of the caustic bath is preferably 9 to 10.5. Suitable siloxanes are specified and preferred compounds are gamma-aminopropyl triethoxysilane, N-beta-aminoethyl gamma-aminopropyltrimethoxysilane and gamma - glycidoxypropyltrimethoxysilane The silanes may be applied from aqueous solution by spraying, dipping or brushing.</p> |
