Reaction spray molding

RHR rate of heat release RSM reaction spray molding... 

Injection Molding Extrusion Blow Molding Thermoforming Reaction Injection Molding Rotational Molding Compression and Transfer Molding Matched Mold Spray-up... 

Appropriate amounts of x y resin and liquified amine were mixed together and evacuated at 60 c in a vacuum oven for t i minutes to remove air bubbles. The reaction mixture was poured into a hot (85°C) aluminum mold vhich was prepared in advance by lic tly spraying mold release agent (ISi 515, Green Chem. Products Inc.) to the inner surfaces of the mold. Samples were cured two hours at 85 C followed by two hours at 150 c (standsuxl cure). In some cases samples were subjected to eui alternate, high temperature cure of two hours at 85 C and two hours at 175 C (HT cure). After curing, samples were stored in a desiccator until use. 

The liquid monomers are suitable for bulk polymerization processes. The reaction can he conducted in a mold (casting, reaction injection molding), continuously on a conveyor (block and panel foam production), or in an extruder (thermoplastic polyurethane elastomers and engineering thermoplastics). Also, spraying of the monomers onto the surface of suitable substrates provides insulation barriers or cross-linked coatings. 

Injection molding Hand lay-up Spray-up Compression molding Preform molding Filament winding Pultrusion Resin transfer molding Reinforced reaction injection molding ... 

The effect of mutation is different in case of stopped samples, but the phenomenon cannot be completely avoided. Here, the experimental time period At is determined by the poison diffusion. The catalyst poison solution is sprayed on top of a reacting sample and then diffuses into the core of the sample where it stops the reaction sequentially layer by layer. This leads to small inhomogeneity in the sample, since the reaction near the upper surface is stopped earlier than the reaction near the bottom of the mold. 

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