Polyamides internal lubricants

Lubricants may be internal (incorporated into the host resin during production or compounding) or external (placed between the sliding surfaces before or during operation). Addition of PTFE to host polymers such as polyamide, polyacetal, polyphenylene sulphide, and PETP polyester considerably reduces their friction coefficients. Internal lubrication is not always the answer, however. In some cases (such as polyamide with 2 wt% silicone oil sliding against steel at a moderate speed and a low load), internal lubrication has been observed actually to increase friction. 

Long chain fatty acids, alcohols and amides function as internal lubricants for polar polymers, e.g. PVC, polyamides, etc., but have relatively low compatibility with non-polar polymers, e.g. polyolefins. 

Uses Internal lubricant for PVC-U profiles, bottle lubricant, release agent for processing PMMA, SAN improves flowability of PP melts lubricant, slip agent for SI B, ABS also for PE, PP, PS, polyamide 6 and 66, extrusion dispersant for PVC Regulatory BGA and FDA approved Properties Beads m.p. 65-70 C 100% act. 

Chemical name polyamide Generic name nylon Common name nylon Type 6/6 homopolymer Reinforcement 30% glass fiber Required additives heat stabilizer Permissible additives internal lubricant Color natural color (no colorant)... 

ILs have been recently evaluated as non-volatile plasticizers and as external or internal lubricants in several polymers including PVC [3], PMMA [4] and polyamides [5]. In this article, an amorphous PL A (polylactide) polymer is blended with two phosphonium-based ILs at various ratios by melt-blending, solution casting and a microencapsulation technique in order to investigate polymer/IL miscibility and its role in the development of a modified polymer with novel rheological, mechanical and thermal characteristics. Results of thermogravimetric analysis, differential scanning calorimetry, capillary rheometry, batch mixer torque measurements and optical microscopy are discussed. 

Fig. 3 GC-MS chromatograms after a 25h and b 1200 h of aging of polyamide 6.6 at 100 °C. Peak 1-18 low molecular weight degradation products evolved from polyamide 6.6 including cyclic imides, pyridine derivatives, chain fragments and cy-clopentanones. L1-L7 alkanes and alkenes from a lubricant added to the polymer. S.l. = internal standard. Reprinted from [14] with permission from Elsevier...

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