Additives for Plastics by J. à těpek, H. Daoust (auth.)

By J. à těpek, H. Daoust (auth.)

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It should be a long-chain hydrocarbon ended by a polar group . 2. Its melting point should be such that the film produced at the surface of the polymer particles is strong enough. -c E 0 - <, C' - - - - -H Fig. 3. The relation between output at 180°C and 800-N pressure on the piston and the lubricant content for suspension polymerized PVC (M = 35,000). Curve a: ethylenediamine distearate (Advawax 280); curve b: Wachs E; curve c: Wachs OP; curve d: Loxiol G-IO; curve e: lead stearate; curve f: calcium stearate; curve g: bis(2ethylhexyl) phthalate (VestinoI AH special) [23].

To be effective a lubricant should be slightly soluble in the polymer and should have some cohesion with the polymer molecules in order not to exude too easily. It should also possess the following qualities [22]: 1. It should be a long-chain hydrocarbon ended by a polar group . 2. Its melting point should be such that the film produced at the surface of the polymer particles is strong enough. -c E 0 - <, C' - - - - -H Fig. 3. The relation between output at 180°C and 800-N pressure on the piston and the lubricant content for suspension polymerized PVC (M = 35,000).

Of many polymers, mainly PVC, acrylonitrile-butadiene-styrene terpolymer (ABS), PS, PMMA, cellulose acetate (CA), polytetrafluoroethylene (PTFE), and so on. 1 shows the relative importance of these polymers as far as the use of lubricants is concerned [5]. 5% by weight Fatty acid amides, 19% by weight Fatty acid esters, 12% by weight When used with a good knowledge of the problem to be solved, lubricants often improve the properties of products (brightness, heat stability in the course of a processing operation, light stability, resistance to degradation by corrosive agents and to water absorption, better dispersion of additives, improved electrical, optical, and mechanical properties, etc.

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Additives for Plastics by J. à těpek, H. Daoust (auth.)
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