Polyester resins mold-release agents

In other areas, POD has been used to improve the wear resistance of a mbber latex binder by incorporation of 25% of Oksalon fibers. Heat-resistant laminate films, made by coating a polyester film with POD, have been used as electrical insulators and show good resistance to abrasion and are capable of 126% elongation. In some instances, thin sheets of PODs have been used as mold release agents. For this appHcation a resin is placed between the two sheets of POD, which is then pressed in a mold, and the sheets simply peel off from the object and mold after the resin has cured. POD-based membranes exhibit salt rejection properties and hence find potential as reverse osmosis membranes in the purification of seawater. PODs have also been used in the manufacturing of electrophotographic plates as binders between the toner and plate. These improved binders produce sharper images than were possible before. 

Unsaturated polyester resin powders can provide a colored and finished exterior molded surface or a finish ready for painting. Normally, a primer/sealer must be appHed to molded articles prior to painting. In addition to the unsaturated polyester resin, multifimctional unsaturated monomers such as triaHyl cyanurate (TAC) [101-37-1] or diaHyl phthalate (DAP) [131-17-9] suitable peroxide initiators (qv) or mixtures thereof, and mold release agents (qv) are used to formulate the coating powder (46). 

Siloxane containing polyester, poly(alkylene oxide) and polystyrene type copolymers have been used to improve the heat resistance, lubricity and flow properties of epoxy resin powder coatings 43). Thermally stable polyester-polysiloxane segmented copolymers have been shown to improve the flow, antifriction properties and scratch resistance of acrylic based auto repair lacquers 408). Organohydroxy-terminated siloxanes are also effective internal mold release agents in polyurethane reaction injection molding processes 409). 

This moldable material primarily consists of TS polyester resin, glass fiber reinforcement, and filler. Additional ingredients, such as low-profile additives, cure initiators, thickeners, and mold-release agents are used to enhance the performance or processing of the material. As with any material, such as metallics and plastics, SMC can be formulated in-house or by compounders to meet performance requirements of a particular application such as tensile properties or Class A surface finish. Varying the type and percentage of the composition will result in variations in mechanical properties and processability. 

Chem. Descrip. Alcohol phosphate, unneutrallzed Uses Internal mold release agent In unsat. polyester resin molding operations and FRP, e.g., metal die, compression, pultrusion corrosion protectant for ferrous metal molds release agent for externally heat-cured molding operations antistat when neutralized lubricant and corrosion inhibitor in oils formulation of textile lubricants and finishes Features Improves surf, appearance of molded parts Properties Pale yel. Ilq. mild fatty alcohol odor sol. In Freon TF, IPA, styrene, toluene, min. oil, kerosene self-dlsp. In water, glycerol Insol. in ethylene glycol sp.gr. 0.98 dens. 8.2 Ib/gal vise. 165 cps decomp. pt. > 175 C flash pt. (PMCC) > 100 C pH 2-3 anionic 100% act. 

The adhesion or sticking of some plastics materials such as resins of phenol-formaldehyde, epoxides, polyesters, and so on, on elements of processing machines, especially molding machines, is a problem that is solved by the use of mold-release agents. This adhesion is due not only to intermolecular forces between the plastic and the metal but also to the mechanical sticking at the high... 

Weight loss and increased surface concentration of stearic acid was observed in bulk molded compounds on aging at 180°C. This was attributed to the reaction of release agent with polyester resin and thickening agents. ... 

Uses Lubricant for PVC, PS, ABS, some engineering resins, food-contact coatings mold release agent in PVC, polystyrene, and polyesters pigment dispersant in HOPE, LDPE, and PP Reguiatory FDA21CFR 177.1210,178.3860 Properties Powd. or beads... 

Uses Internal mold release agent for polyester resin molding operations, esp. matched metal die, compression and pultruslon antlstat nondurable antistatfor textiles, plastics, and films wetting agent... 

Uses Detergent emulsifier for fats, oils, soivs., waxes, polyester resins, silicone emulsions demulsifier for crude oils latex stabilizer glass mold release agent Properties HLB 16.0 cloud pt. 68-72 C (1% in 10% NaCI)... 

The article, which is usually in the form of an impregnated fabric, is laid-up on a mold or a base plate (Figure 6.65 and 6.66) which defines the surface shape of the article. A release agent is applied to the mold surface to prevent adhesion of the part to the mold. A release film, such as a fluoropol5mier typically a fluorinated ethylene propylene copol5mier or a glass fabric coated with polytetrafluoroethylene is often the next layer. Other films such as nylon or polyester can be used where release is less demanding such as lower cure temperature resins. 

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