polyurethanes teriminin İngilizce İngilizce sözlükte anlamı
Widely used synthetic polymers that are chlorine free, but produced with the help of chlorine
A large family of polymers based on the reaction product of an organic isocyanate with compounds containing a hydroxyl group The commonly used isocyanates are toluene diisocyanate (TDI) [CH3C6H3(NCO)2], methylene diphenyl isocyanate (MDI) [OCNC6H4CH2C6H4NCO], and polymeric isocyanates (PMDI), obtained by the phosgenation of polyamines derived from the condensation of aniline [C6H5NH2] with formaldehyde (HCHO] Polyols (with hydroxyl groups) are macroglycols which are either polyester or polyether based Polyurethane elastomers and resins take the form of liquid castings systems thermoplastic elastomers and resins, microcellular products, and millible gums Typical applications are found in the automotive industry Polyurethane foams are widely used in transportation, furniture, and construction markets
any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber
A synthetic rubber formed by the reaction of a glycol with an isocyanate When used in sealants, yields a rubber-like material with excellent strength characteristics Used as exterior sealant and sealed insulating glass sealant
Expanded plastics that are used when high insulation values are to be achieved as they have excellent insulation properties It is generally used as a rigid board for installation in sloping roofs or even between the studs in external wall panels It can also be sprayed in situ as an expanding foam to follow complex shapes
A tough, hard-wearing coating made of synthetic resins It serves as a good top coat or finish and can be applied over most types of paint, except artist's oils
any of various sythetic rubber polymers produced by polymerization of hydroxyl (OH) radical and NCO group from two different coumpounds: used in cuszions, insulation, molded products
Polymeric substance containing many urethane linkages Abbreviated as PUR A large family of polymers with widely ranging properties and uses, all based on the reaction product of an organic diisocyanate with compounds containing a hydroxyl group, and having the 'RNHCOOR'- group in their chains The types and properties of polyurethanes are so varied that they have been dubbed the "erector set" of the plastics industry They may be thermosetting or thermoplastic, rigid and hard or flexible and soft, solid or cellular; and the properties of any of these types may be varied within wide limits to suit the desired application
This material is used primarily as a cable jacket material It has excellent oxidation, oil and ozone resistance Some formations also have good flame resistance It is a hard material with excellent abrasion resistance It has outstanding "memory" properties, making it an ideal jacket material for retractile cords
Coatings ranging from hard glossy enamels to soft, flexible coatings With thorough surface preparation, polyurethanes provide good to very good adhesion, hardness, flexibility and resistance
A thermosetting material used a great deal in foam form which, when hardened off, can be cut and shaped In the foam state, it can be used to insulate, 'pot' electrical parts and provide buoyancy in boats
A plastic made of polymerized urethane Used to contain the inert gas in the Nike AIR system Also used as a midsole cushioning material; it is stiffer than EVA
Polyurethane is a plastic material used especially to make paint or substances which prevent water or heat from passing through. polyurethane varnish. a plastic used to make paints and varnish (poly- + urethane type of chemical compound (19-21 centuries) (from urea substance found in urine)). Any of a class of very versatile polymers that are made into flexible and rigid foams, fibres, elastomers (elastic polymers), surface coatings, and adhesives. They are produced by reacting a diisocyanate (a compound with two functional groups of the type NCO) with a diol (a compound with two hydroxyl, or OH, groups). Foamed polyurethanes, used for insulation and mattress and upholstery filler, are made with organic compounds containing carboxyl groups, causing a reaction that liberates carbon dioxide bubbles throughout the product. Spandex fibres are highly elastic and have replaced natural and synthetic rubber fibres for many textile purposes. Polyurethane elastomers are made into auto parts, rollers, flexible molds, medical equipment, and shoe soles. Polyurethane surface coatings are applied as sealants to wood, concrete, and machine parts and as linings for tanks and pipes; moisture-curing polyurethane resin is used as a general-purpose waterproof glue