摘要:
The invention relates to a continuous method for producing organopolysiloxanes having an OH content of 3.0 to 10.0 wt%. In said method, chlorosilanes, alkoxysilanes, water, and non-polar solvent soluble in water at no more than 1 g in 1 l water at 20°C and 1 bar are continuously added to the reaction mixture in a metered manner and reaction mixture is continuously discharged. In said method, in parallel with each other, the chlorosilanes are added in a metered manner at a weight fraction of 95% to 60% and the alkoxysilanes are added in a metered manner at a weight fraction of 5% to 40% with respect to the sum of chlorosilanes and alkoxysilanes. No polar solvents are added in a metered manner.
摘要:
The invention relates to the continuous production of prepolymers (A) having end groups of the general formula (1): (R 1 ) a (R 2 ) 3-a Si-X-A, wherein the end groups (1) can be identical or different, A is a two-band link group selected from - (R 3 )N-CO-NH-, -HN-CO-N(R 3 )-, -O-CO-HN-, -HN-CO-O-, S-CO-HN-, -HN-CO-S-, X is a two-band, linear or branched alkyl group, optionally substituted with halogen atoms, having 1-10 carbon atoms, R 1 is an alkyl, cycloalkyl, alkenyl or aryl residue, optionally substituted with halogen, having 1-10 carbon atoms, R 2 is an alkoxy residue -OR 3 , an acetoxy residue -O-CO-R 3 , an oxime radical -O-N=C(R 3 ) 2 or an amine residue -NHR 3 or -NR 3 2 R 3 is hydrogen, a linear, cyclical or branched radical, substituted with heteroatoms, having 1 to 18 carbon atoms, R 4 is a linear, branched or cross-linked polymer radical, a is 0, 1 or 2, and n is a whole number that is at least 1, wherein the prepolymers (A) are produced by a continuous method comprising at least one reaction of an isocyanate group (-N=C=O) having at least one isocyanate reactive group, that is carried out continuously in at least one reactor (R), that enables heat dissipation capacities of greater than 5kW/ (m 3. K) in the laminar flow region.
摘要:
Organosilicon compounds bearing SiOC groups and having low residual silicon-bonded chlorine are prepared continuously by reacting a chlorosilane with alcohol and optionally water by contacting a gaseous phase containing alcohol with a liquid phase containing silane, organosilicon intermediates, organosilicon compounds containing SiOC groups and optional inert solvent in a reaction column in which the gas phase passes through the liquid phase in bubble form, or is provided with a vaporizer operating by a crossflow principle.