Water-Base Mold Releases

Water-based mold releases are available. Care must be taken with these materials to ensure that the water used to carry the release agent is completely evaporated before use. 

Water-based mold-release agents need more heat to dry the coating and to reheat the reinforcing. Solvent-based mold-release agents tend to flash off and leave a coating with greater ease. The operation with the solvent-based material needs to be carried out away from any flames. 

Water-Base Mold Releases. Water-base release agents are being used more widely. Solvent-base agents evaporate too quickly in warm areas. One example is a hydro-alcoholic solution of saponified fatty acids claimed to produce a dry-fihn coating. Axel Plastics Research Laboratories in Woodside, NY has a new product. Mold Wiz H40-3U, for flexible polyurethane foam. This material is heated to evaporate the water and is then applied with high-pressure spray equipment (44). 

Molded urethane technology in the immediate future should not be limited by mold release considerations, but the role of the mold release in new systems should be considered early in the plans. Regulations for air quality control and worker safety are expected to create a continuing shift to water-based mold releases, or at least some means of greatly reducing the amount of solvent evaporated. Some progress seems likely in use of semi-permanent release coatings which can be renewed by periodic application of a top coat. 

Aqualease, Water-based mold release agents, Mann, George, Co. Inc. 

Mold-release agents are supplied in either a solvent or water. The solvent-based materials present handling problems, as they are flammable. There are two potential sources of ignition (1) flames used to pop bubbles that come to the surface of the casting, and (2) arcs from electrical contacts that can also set the solvent vapor off. 

Mineral oil is used primarily as an excipient in topical pharmaceutical formulations, where its emollient properties are exploited as an ingredient in ointment bases see Table I. It is additionally used in oil-in-water emulsions,as a solvent, and as a lubricant in capsule and tablet formulations, and to a limited extent as a mold-release agent for cocoa butter suppositories. It has also been used in the preparation of microspheres. " ... 

Aqualine. [Dexter/Fiekote] Water-based release agent semipermanent mold release interface for natural and synthetic rubber oompds., thermosets and thermoplastics. 

External mold releases, sprayed onto the mold and not added to the compound itself, can still be valuable tools. These solutions are water- or solvent-based, and when applied condense into a semi-durable, heat-resistant film on the hot mold that may allow dozens of part releases or more before having to be reapplied. However, if an external agent has to be used repeatedly during a production run, it can interfere with productivity, making a mold-rdease lubricant added to the resin itself the more cost-effective approach [11-3,11-13],... 

Chem. Descrip. Water-based Uses External release agent for PU for in-mold coatings Moly-White 92 [SWC/Moly-White Pigments]... 

Chem. Desetip. Partially saponified polyethylene wax CAS 9002-88-4 EINECS/ELINCS 200-815-3 Uses Mold release agent for plastics corrosion inhibitor dry-bright emulsion polish and preservative Featmes Water-based... 

Uses Defoamer mold release applies. intennediate for esters useful as lubricants, defoamers in rubber, phannaceuticals components for urethane resins boiler water additive for food contact defoamer for beet sugar and yeast processing emollient, solvent in cosmetics, phannaceuticals lubricant base for textiles, paper, metalworking food-pkg. adhesives in paper/paperboard in contact with aqTfatty foods plasticizer in food-contact polymers defoamer in food-contact coatings and paper/paperboard... 

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