| 摘要 |
<p>1. Method for the production of thermoplastic moulding masses containing caprolactam by hydrolytic polymerisation of caprolactam in the autoclave at pressures up to 20 bar and elevated temperatures in the presence of water and a weak acid, whereafter the molten mass is transferred from the autoclave into an intermediate vessel under vacuum for the further polymerisation and the removal of volatile components such as water, monomeric caprolactam and oligomers, characterized in that the polymerisation in the main stage is effected discontinuously and in at least two autoclaves with stirring device at temperatures of 220 to 280 degrees, which autoclaves supply the intermediate vessel alternately, quasi-continuously, whereafter the mass passes continuously out of the intermediate container into a multi-shaft extruder with segmented screw and housing parts capable of being differently regulated in temperature, and is there brought by means of elevated temperature and vacuum to the desired degree of polymerisation and content of monomer, and is provided in a second region of the extruder equipped with a single drive capable of high speeds of rotation with various additives such as lubricants, heat stabilisers, colouring, filler and reinforcing materials, softeners and elasticisers, whereafter a further de-gassing takes place in the end region of the extruder and the mass is then extruded and if desired granulated.</p> |
