Lubricating process aid

Lubricants. Process aids or lubricants promote smooth and rapid extmsion and calendering, prevent sticking to extmders or calender roUs, and impart good release properties to molding compounds. In some cases use of lubricants allow slightly lower processing temperatures (see Vinyl polymers). 

Cosmetics. Talc is widely used in baby and body powders, pressed powders, creams, and antiperspirants. Its softness, sHp, inertness (fragrance retention), and relative safety make this one of the oldest and most widely recognized appHcations for talc. Talc is also used in chewing gum as a detackifier and in tableting as a lubricating process aid. 

In conclusion, it may be said that a lot of literature has been published that favors the Frye and Horst mechanism of stabilization. Most of this is based on studies done on low-molecular weight model compound for al-lylicchlorines in PVC, i.e., 4-chloro-2-hexene. Although the large contribution of these studies toward understanding the mechanism of stabilization of PVC cannot be denied, the extrapolation of these results to the processes involved in the actual stabilization of the polymer should be done with extreme care. The polymer represents a complex mixture of macromolecules, which in the melt is not only physically a very different system compared to the low-molecular weight model compound, but invariably contains, apart from stabilizers, other additives, such as plasticizers, lubricants, processing aids, etc., that further complicate the situation. The criticism of the Frye and Horst mechanism is also based on solid experimental evidence, and hence, the controversy is still very much alive. 

The first step in processing is usually powder mixing in a high speed, intensive mixer. PVC resin, stabilizers, plasticizers, lubricants, processing aids, fillers, and pigments are added to the powder blend for distributive mixing. 

Table V. Effect of Varying Lubricant/Processing Aid in PVC/PTHF Blends a...

Lubricant/Processing Aid phr Notched Izod Impact Strength (ft Ibs/in Notch)... 

Denlube. [Graden] Antiblocking agent, lubricant, processing aid, frothing aid, foam stabilizer for rubber and latex processing, coatings. 

Mekon White. [Petrolite/Polymers] Microcrystalline wax release agent lubricant processing aid, binder, plasticizer, antiozonant fa coatings, adhesives, inks, plastic modificadon, lacquers, paints, varnishes, ceramics, for potting/filling in elecVdectronic components, rubber, wax size. 

The butyl polymer (E) gave a nonlinear curve indicating that possibly two or more products were being condensed. Only one product, stearic acid, was identified by infrared analysis, however, it is possible that other oxidized hydrocarbons were present in lesser concentrations. Stearic acid is used in many rubber formulations as an accelerator activator and as a lubricant processing aid ( 7), and usually exists in the free state in the rubber. It is therefore easily outgassed, as are the plasticizers, and condenses on the cooler surfaces of the collector. The stearic acid was still being evolved after 225 hours at 150°C. 

Uses Lubricant, processing aid for PVC, PS, ABS, nyion food-contact coatings... 

Uses Internal lubricant, processing aid, mold release, antistat for inj. molding, extrusion, composite molding of polyester resins and gel coats, thermoplastics incl. acetal, PE, PS, PP, PPO, TPU, MMA-modified resins... 

Chem. Descrip. Petrolatum USP CAS 8027-32-5 EINECS/ELINCS 232-373-2 Uses Lubricant, process aid in pharmaceuticals emollient in petrol, jelly, ointments, sun care prods., suppositories industrial applies. protective coating on foods binder carrier moisture barrier plasticizer protectant softener in confectionery lubricants, meat packing, mold release agents and lubricants for foods catalyst carrier, extrusion aid, plasticizer for polymers... 

Uses Emollient, skin conditioner in cosmetics lubricant, processing aid for butyl rubber, adhesives, inks, cosmetics, greases, paints opacifier, pearlescent, emulsifier, vise, builder for surfactant systems defoamer in food-contact paper/paperboard Reguiatory FDA 21CFR 176.210... 

Definition Reaction prod, of microciystalline wax and oi en Uses External lubricant, processing aid, slip agent, antiblocking agent, scuff/mar resist, aid in plastics, styrenics, polyolefins, TPOs, for formulation of emulsions, coatings, textile finish softeners, floor, auto, and liq. solv.-based polishes modifier in solvent polish systems car-nauba substitute... 

Uses Colorant/pigment for printing inks, resins, plastics, rubber, paper/ wood coatings, sizing, textile lubrication processing aid in latex foams antiozonant... 

Preparing fabrics for dyeing and printing is important because traces of spinning lubricants, processing aids, and dirt can have a marked impact on the quality of the subsequent coloration step. Batch-to-batch consistency in preparation is equally important for shade consistency. Redyeing or subsequent downgrading to second quality detracts... 

Synonyms Phenyididecyl phosphite Empirical C26H47O3P Formula C6H50P(OCioH2i)2 Properties Nearly water-wh. liq. alcoholic odor m.w. 438.64 dens. 0.940 (25/15.5 C) m.p. 0 C flash pt. (COC) 218 C ref. index 1.4785 Precaution Combustible Uses Heat stabilizer, antioxidant for resin systems, esp. PVC chemical intermediate lubricant, processing aid for PVC Manuf./Distrib. Akcros Am. http //www.akcros.com, GE Spec. http //www.ge.com/specialtychemicals Trade Name Synonyms Mark DDMPP t[Crompton/Witco Vinyl Addit.] Stavinor DDPP [Ceca SA http //www.ceca.fr]... 

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