Synthesis of rare-earth stearate by improved double decomposition method and one-step method;

Synthesis of rare-earth stearate as heat stabilizers for PVC;

Computer-aided optimization design in the synthesis of rare-earth stearates;

Study and comparison of the heat stability of PVC stabilized by rare earth stearate and by calcium stearate;

PVC stabilized by various rare earth stearates in combination with zinc stearate has similar initial colorations but different mediumterm and .

In this paper,the performances of rare earth stearate used as a non-toxic heat stabilizer for polyvinyl chloride was summarized.

An epoxy stearic acid rare earth was synthesized.

The results showed that heat stabilities and transparencies of the rare earth fatty acid salts changed progressively in the same pattern as their melting points:stearate~palmitate~myristate~laurate>caprate>caprylate>oleate.

The separation was achieved on AS9 anion separation column with sodium carbonate mobile phase,the detection was performed by a conductivity detector,quantitative analysis was conducted with a calibration curve by measuring the peak area,then sulphate content was calculated,that is the determination of sulphate content in rare earth carbonate and rare earth chloride.

The rule of granularity change in grinding of rare earth carbonate was discussed.

The raw materials of high function polishing powder come from rare earth carbonateThe technological conditions of preparing polishing powder from rare earth carbonate such as roasting and screening were studiedAccording to polishing rule,the effect factors of polishing was analysedSo the best technological conditions are found and high function polishing powder is produced