Polyolefins lubricants

Properties Pale yel. liq. m.w. 634 dens. 0.915 (25/15 C) m.p. 20 C ref. index 1.4985-1.5025 flash pt. (COC) 430 F Toxicoiogy TSCA listed Precaution Combustible Uses StabiIizer for polymers esp. polyolefins lubricant chemical intermediate antioxidant and sulfur deactivator in lubricants improves antiwear and antifriction props. 

EBS has a good balance of internal and external lubricating properties. It was the first major lubricant used in rPVC. It has a broad processing latitude and is quite forgiving of formulation errors. Until the late 1980s, EBS was the lubricant of choice for siding and pipe in the United States. Since then the switch from single screw to twin screw extruders has required more external lubrication, and most producers now use a paraffin/oxidized polyolefin lubrication system. 

Uses Pigment dispersant for use in most polyolefins lubricant and processing aid for plastics and robber antislaL mold release agent in polymeric resins in confect with food... 

Uses Acid neutralizer/acceptor/scavengerfor polyolefins lubricant for PVC, polyolefins, filled compds. dough strengthened emulsifier, processing aid, surfactant, stabilizer, formulation aid, whipping agent, conditioner in foods Features Contains no milk protein Trade Names Pationic 925 Calcium stearate... 

Polybutenes enjoy extensive use as adhesives, caulks, sealants, and glaring compounds. They are used as plasticizers in mbber formulations with butyl mbber, SBR, and natural mbber. In linear low density polyethylene (LLDPE) blends they induce cling to stretch-wrap films. Polybutenes when modified at their unsaturated end groups with polar fiinctionahty are widely employed in lubricants as dispersants. Blends of polybutene with polyolefins produce semisoHd gels that can be used as potting and electrical cable filling materials. 

Siloxane containing interpenetrating networks (IPN) have also been synthesized and some properties were reported 59,354 356>. However, they have not received much attention. Preparation and characterization of IPNs based on PDMS-polystyrene 354), PDMS-poly(methyl methacrylate) 354), polysiloxane-epoxy systems 355) and PDMS-polyurethane 356) were described. These materials all displayed two-phase morphologies, but only minor improvements were obtained over the physical and mechanical properties of the parent materials. This may be due to the difficulties encountered in controlling the structure and morphology of these IPN systems. Siloxane modified polyamide, polyester, polyolefin and various polyurethane based IPN materials are commercially available 59). Incorporation of siloxanes into these systems was reported to increase the hydrolytic stability, surface release, electrical properties of the base polymers and also to reduce the surface wear and friction due to the lubricating action of PDMS chains 59). 

Thermal stabilizers combat degradation by removing the hydrogen chloride that is generated. Additionally, we treat polyvinyl chloride more gently than we do polyolefins. We use milder processing conditions (lower temperatures and lower shear rates) and add lubricants to... 

Slip additives act at the surface of a polymer film or article to reduce the friction between it and another surface. In a variety of plastics, such as polyolefins, polystyrene, and polyvinyl chloride, fatty-acid amides are applied as slip additives. Fatty-acid amides, such as oleamide, stearamide, erucamide, and oleyl palmitamide, are added to plastic formulations where they gradually tend to bloom to the surface, imparting useful properties including lubrication, prevention of films sticking together, and reduction of static charge. 

Lubricating properties -of polyolefins [OLEFIN POLYMERS - POLYMERS OF HIGHER OLEFINS] (Vol 17)... 

Abstract Polyolefins such as polyethylene, polypropylene and their copolymers have excellent bulk physical/chemical properties, are inexpensive and easy to process. Yet they have not gained considerable importance as speciality materials due to their inert surface. Polyethylene in particular holds a unique status due to its excellent manufacturer- and user-friendly properties. Thus, special surface properties, which polyethylene does not possess, such as printability, hydrophilicity, roughness, lubricity, selective permeability and adhesion of micro-organisms, underscore the need for tailoring the surface of this valuable commodity polymer. The present article reviews some of the existing and emerging techniques of surface modification and characterisation of polyethylene. 

The solubility of lubricants in polymers is managed by the old rule simili similia sol-vuntur. e.g., the non-polar additives (waxes) are readily soluble in polyolefins. On the contrary, fatty acids and their esters are not and function as outer lubricants that may come more easily in contact with food than the inner lubricants. The solubility or compatibility of lubricants such as 2 or 3 is temperature dependent. 

Lubricants are used in rigid PVC (PVC-U) in amounts 0.3-0.8% (metallic soaps acting primarily as heat stabilizers are used at levels up to 1.5 %). In polyolefins, calcium or zinc stearates used as antiacids provide the lubricating effect at 0.1 to 0.2%. Fluoropolymers are used specifically for L-LDPE. 

Naugard 445 is non-discoloring aromatic amine antioxidant that works synergistically with phosphites and phenolic antioxidants as a thermal stabilizer in polyolefins, styrenics, polyols, hot melt adhesives, lubricants, and polyamides. 

Use Slip additives for PVC and polyolefin resin films, antistatic and antifogging agent for clear plastic wraps, and as internal lubricants. 

Use For slip agents and for friction reduction in polyolefin films. As process lubricants for styrenics and PVC, mold release for phenolics, as antiblock agents for polyolefins. 

All the common extrusion techniques can be used to process PVDF into various products, such as rod, sheet, film, pipe, tubing, monofilament, wire insulation, etc.f No extrusion additives, lubricants, or heat stabilizers are needed. Equipment with materials of construction similar to those used for extruding PVC and polyolefins is applicable for PVDF. Extrusion temperatures vary from 210°C to 270°C depending on the type of PVDF resin and the shape being extruded. Extruders with L/D ratios of at least 20 are recommended. For very thin products, the temperature at the dietip can be as high as 320° C as required for heat polishing. 

Whereas bis(stearoyl)ethylenediamine (EBS), generally known as amide wax, shows an unusually high melting point of 140°C and has a good balance of internal and external lubricating properties for PVC, the fatty acid monoamides, more particularly oleamide, stearylamide, and erucamide show a pronounced external effect. They are more particularly used as lubricants, mould release and antiblocking agents in polyolefins. 

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