Abstract:
The invention relates to a method for producing a hard foam, comprising the following steps: at least one polyisocyanate is reacted with a mixture containing at least one polyepoxide, water and at least one additional hydrogen azide compound, said reaction taking place in the presence of a metal-free Lewis base with at least one nitrogen atom, hard foams obtained according to said type of method, and to the use of the claimed hard foam for producing insulating materials, vacuum insulation panels, cooling devices, components, wind rotor blades or elements boat and vehicle construction.
Abstract:
The invention relates to a method for producing polyurethane-coated line elements and the use thereof preferably in maritime environments. In said method, (a) a mixture of aromatic and aliphatic polyisocyanate is mixed with (b) at least one polymer compound having at least two isocyanate-reactive hydrogen atoms, (c) chain extending agents having a functionality of 2 to 4 and a hydroxyl number of 500 to 2500 mg KOH/g, (d) catalyst, and (e) optionally, other auxiliary agents and/or additives, to obtain a reaction mixture, and the reaction mixture is directly or indirectly applied to a suitable substrate and is allowed to finish reacting to obtain a polyurethane layer, the chain extender characteristic KV of isocyanates (a) and of all isocyanate-reactive compounds of components (b) to (e) according to formula (1) being 1 to 100, where M(aromat. Isocyanat) is the weight ratio (in wt%) of the aromatic isocyanate in relation to the sum of the total weight of the isocyanate used and isocyanate-reactive compounds of components (b) to (e), NCO(aromat.Isocyanat) is the NCO content (in wt%) of the aromatic isocyanate, and M(Kettenverlängerer) is the weight ratio (in wt%) of the chain extender in relation to the sum of the total weight of the isocyanate used and the isocyanate-reactive compounds in components (b) to (e). The invention further relates to line elements obtainable according to a method of this kind.
Abstract:
The present invention relates to a process for producing a shoe sole comprising a hybrid material made of a polyurethane foam as matrix material and of foamed particles of thermoplastic polyurethane by preparing an inlay of joined expanded particles (c″) of thermoplastic polyurethane and placing the joined expanded particles of thermoplastic polyurethane in a mould and embedding the inlay with a reaction mixture obtainable by mixing (a) polyisocyanates with (b) compounds having hydrogen atoms reactive toward isocyanates, and if appropriate, with (d) chain extenders and/or crosslinking agents, and with (e) catalysts, and with (f) blowing agents, and with (g) further additives and reacting the reaction mixture to give the shoe sole. The present invention further relates to shoe soles, obtainable by such a process.
Abstract:
The invention relates to a method for producing polyurethane molded foam bodies, wherein a) organic polyisocyanates are mixed with b) polyols, containing b1) polyesterols and b2) polymer polyetherols having a fraction of primary OH groups of less than 50%, c) expanding agents, and optionally d) chain lengthening agents and/or cross-linking agents, e) catalysts and f) other auxiliary agents and/or additives, to form a reaction mixture, introduced in a mold and allowed to fully cure to form a polyurethane molded foam body. The invention further relates to the use of polymer polyetherols and polymer polyesterols for producing polyurethane molded foam bodies and to the use of such polyurethane molded foam bodies as a shoe sole.