Molding gels thickeners

A variation of the compression molding technique is to use transfer molding. In this method the liquid polyurethane mix is placed in a pot and allowed to thicken. The polyurethane semi-gel is forced through sprues into the mold, and the air is allowed to escape through vent holes. The part is allowed to cure sufficiently so that it can be removed. Figure 5.2 shows the general layout of a compression and transfer mold. 

Chem. Descrip. Polyethylene homopolymer wax CAS 9002-88-4 EINECS/ELINCS 200-815-3 Uses Processing lubricant melt index modifier pigment dispersant mold release aid external lubricant for PVC, color cones., polyolefin flow modifiers thickener for cosmetic and pharmaceutical gels solv.-based polishes, inks, paints, and lacquers food pkg. adhesives, coatings, paper/paperboard, cellophane, rubber articles, textiles, lubricants defoamer chewing gum base... 

Uses Gellant, emulsifier, and thickener for cosmetic creams, lotions, sun care, lipstick gels, makeup, depilatories, ointments, salves, sustained-release pharmaceuticals, furniture/wood/leather polishes, leather/textile/wood/paper finishes, candles, molding, lithography Properties Wax m.p. 62-65 C acid no. 17-24 Koster Keunen Synthetic Japan Wax [Koster Keunen]... 

Another means of enhancing uniformity is to combine glass and resin beforehand. Sheet molding compound (SMC) is one approach [37]. When the liquid polyester (actually polyester and styrene) is thickened by less than 1% of calcium or magnesium oxide, the gel has a yield stress and can be handled without dripping. SMC is made by combining thickened polyester, fillers, peroxides, and chopped glass fiber between layers of polyethylene. The mat can be produced continuously... 

---