| 摘要 |
1,226,988. Drying polymers. ESSO RESEARCH & ENG. CO. 30 Sept., 1968 [10 Oct., 1967], No. 46353/68. Heading F4G. [Also in Division H5] A method of removing a polar vehicle (e.g. water or organic solvent) from an essentially non-polar polymer (e.g. butyl rubber, halogenated butyl rubber, polyvinyl chloride, polypropylene, polyisobutylene or styrenebutadiene rubber) comprising subjecting it to microwave radiation at a frequency of 900- 30,000 mega hertz until the polar vehicle content of the polymer is less than 5000 p.p.m., parts being by wt. The polymer's polar vehicle content may be reduced prior to the microwave treatment by filtration on a vibrating screen, and a screw press. The dry polymer may be subsequently baled. The polymer may be conveyed on a screen belt 29 of P.T.F.E. or ceramics through one or two resonating cavities 21 to subject it to microwave radiation, the microwaves being supplied through openings 22, 23, 24. Loss of radiation through the inlet 26 and outlet 25 is suppressed by means of filters or absorbing barriers 27 of water or ethylene glycol. The cavity includes mode stirrers 33. To prevent condensation in the cavity warm air is introduced through openings 31 and exhausted through openings 32. |
