A method for improving the haftfaehigkeit of in the active mass of the lead electrodes embedded particles on the active mass

摘要

1,114,726. Lead accumulator electrodes containing coated particles. ZELLSTOFFFABRIK WALDHOF. 10 Feb., 1967 [12 Feb., 1966], No. 6459/67. Heading H1B. In electrodes of lead accumulators containing in the active material inert particles coated with a lignin sulphonic acid or salt thereof, the adhesion of the particles to the active material is improved by heating the lignin sulphonic acid or salt in powder form above 100‹ C. (preferably 150-220‹ C.) before coating the particles with it. Suitable particles are granules or short fibres of thermoplastic or thermosetting material, or glass or asbestos fibres. Suitable lignin sulphonates are those of alkali metals, alkaline earth metals and lead. The sulphonic acid or salt may amount to 6-20 wt. per cent of the particles. In Examples sodium lignin sulphonate is heated at 200‹ C. for 1 hr and the magnesium salt for 1¢hrs. at 210‹ C. They are applied in 25% aqueous solutions to P.V.C. chips.