Syntactic polyurethanes are prepared by mixing hollow microspheres with polyurethanes by a process in which, in a first step, the polyurethane system components are reacted and, in a second step, the feeding of the hollow microspheres is effected in a mixing apparatus, the mixing apparatus being fre
Syntactic polyurethanes are prepared by mixing hollow microspheres with polyurethanes by a process in which, in a first step, the polyurethane system components are reacted and, in a second step, the feeding of the hollow microspheres is effected in a mixing apparatus, the mixing apparatus being free of dead space and comprisingi) a mixing pot,ii) a feed for polyurethane,iii) a feed for hollow microspheres,iv) a stirring element andv) an outlet orifice.
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1. A process for the preparation of a syntactic polyurethane by mixing hollow microspheres with a polyurethane preparable by reactinga) a polyisocyanate with b) a compound which has at least two hydrogen atoms reactive toward isocyanate, in the presence or absence of c) a catalyst, d) a blowing agen
1. A process for the preparation of a syntactic polyurethane by mixing hollow microspheres with a polyurethane preparable by reactinga) a polyisocyanate with b) a compound which has at least two hydrogen atoms reactive toward isocyanate, in the presence or absence of c) a catalyst, d) a blowing agent and e) an additive, which process comprises in a first step, reacting the components a) and b) and, if required, c) to d) to obtain a polyurethane mixture, and in a second step, mixing the polyurethane mixture with the hollow microspheres in a mixing apparatus which is free of dead space and which comprisesi) a mixing pot, ii) a feed for polyurethane, iii)a feed for hollow microspheres, iv) a stirring element and v) a regulatable outlet orifice, to obtain the syntactic polyurethane, and wherein the syntactic polyurethane has a viscosity of from 1 000 to 30 000 mPa·s at the outlet orifice.2. A process as claimed in claim 1, wherein the mixing of the components a) and b) and, if required, c) to d) is effected in a high-pressure or low-pressure mixing head.3. A process as claimed in claim 1, wherein the mixing pot i) comprises a funnel-like design, the outlet orificev) being present in the neck of the funnel. 4. A process as claimed in any of claims 1 to 3, wherein the size of the outlet orifice is regulated by a conical closure which is movable in a vertical direction relative to the outlet orifice.5. A process as claimed in claim 1, wherein the syntactic polyurethane has a content of hollow microspheres of from 1 to 80% by weight, based on the total weight of the syntactic polyurethane.6. A process as claimed in claim 1, wherein the average residence time of the mixture of polyurethane and hollow microspheres in the mixing pot i) is from 0.1 to 10 minutes.
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