Liquid injection molding foamed plastics

Foamed casting is a simple non-mechanical version of pouring (Chapter 11), reaction injection molding (RIM) (Chapter 12) or liquid injection molding (LIM) (Chapter 16). Liquid components of the plastic with... 

Reaction injection molding (RIM) is a fast, low-pressure, low-temperature, low-cost process for one-step conversion of reactive liquids into large finished solid plastic products. Liquid polyol and liquid diisocyanate are mixed by impingement, pumped instantly to fill a large mold cavity, and polymerize/ cure rapidly to form a thermoset polyurethane product. The cured polymer may be a stiffly flexible product such as automotive bumper covers, front ends, and trim or a rigid foamed product such as furniture and housings (cabinets) for computers, business machines, TY and radio. 

Beilstein Handbook Reference) AI3-16360 BRN 2568983 CCRIS 6199 Diphenyl-2-ethylhexyl phosphate EINECS 214-987-2 2-Ethylhexyldiphenylphosphate HSDB 370 Ooticizer Phosphoric acid, 2-ethylhexyl diphenyl ester Santicizer 141. Flame retardant plasticizer for type PVC applications, dip, rotationally, extruded and injection molded parts, mechanical foam. Liquid bps = 232° d = 1.090 LDsO (mus ip) = 930 mg/kg. Akzo Nobel Ashland Bayer AG Marwick Miles Inc. Monsanto Co. Polysar. 

Obtained forms of foamed plastics are blocks, sheets, slabs, boards, molded products, and extruded shapes. These plastics can also be sprayed onto substrates to form coatings, foamed in place between walls (i.e., poured into the empty space in liquid form and allowed to foam), or used as a core in mechanical structures. It has also become possible to process foamed plastics by conventional processing machines like extruders and injection-molding machines. 

ET Screw, Single screw extrusion, blow molding, and injection molding, Barr, Robert, Inc. Ethacure, Liquid aromatic diamine epoxy, and urethane curatives, Albemarle Ethafoam, Polyethylene foam, Dow Plastics Ethanox, Hindered phenolic antioxidants, Albemarle... 

Temperature Profile n (1) In extrusion or injection molding, the sequence of barrel temperatmes from feed opening to head, sometimes presented as a plot of temperatme versus longitudinal position, hence profile. (2) The sequence of metal temperatmes across a sheet or film die, or around a large blown-fihn die. (3) The sequence of temperatmes across the width of a slab of newly extruded or cast plastic foam, is indicated by temperatme sensors placed laterally at the same depth in the foam. (4) In analysis of Nonisothermal, laminar flow of very viscous liquids (e.g., polymer melts) within tubes and dies, the sequence of temperatmes from the one sidewall through the center to the opposite sidewall at any point along the axis of flow. Such profiles have also been measured experimentally with traversing thermocouples. 

---