Fillers expandable microspheres

Fire resistance is an important property of phenolic resins. The combination of phenolic resin with Expancel expandable microspheres leads to many useful products. Composites for high speed train interiors take advantage of the light weight, excellent fire rating, and very low thermal conductivity. Polyester filled with aluminum hydroxide is an alternative solution for train interior materials. The resin and filler can be easily processed when viscosity regulating additives are added. 

Expandable microsphere Thermoplastic microspheres are droplets of hquid hydrocarbon encapsulated in a shell of a thermoplastic polymer. When exposed to heat, the shell softens and the hydrocarbon gasifies, and the microsphere expands firom, typically, 12 to 40 pm and the density drops from 1000 to 30-40 kg/m. The microspheres can be used either as a form of blowing agent, or may be supphed in expanded form for use as a lightweight filler. The activating temperature of mold and material is lOOC (212F). 

Uses Blowing agent in printing inks, PU, PVC plastisols, fabrics, paper expanded microspheres as ultra-low density tillers tor use in engineered prods, in which other fillers would not be suitable, e.g., syn. marble and wood, coatings, sealants, explosives, auto, marine fillers, molding compds., composites, paint and crack fillers, cable fillings, elastomers Features Unexpanded microspheres Expancel 551 DE 20 [Expancel]... 

Uses Filler in coatings, sealants, paints, cable fillings Features Wet, expanded microspheres ultra-low dens. 

Thermosets also benefit from the foam structure, as evidenced by improved thermal insulation, sound dampening and mechanical stress absorption responses to temperature changes or impact. Hollow spheres with an already set volume are normally used, that is, pre-expanded microspheres. The reason is that the curing reactions often interfere with any expansion before a sufficient volume increase has been obtained. Hollow organic spheres are found in products such as sealants, adhesives, putties, pipes, cultured marble, body fillers, model-making materials, and pastes [2, 3, 19]. Common suitable matrix materials are epoxies, PUR, and polyesters. 

There are also synthetic fillers such as hollow, solid and expandable microspheres made of glass or polymer (several are available in coated or metalled form). 

Expancel . [Expancel] Expandable thermoplastic hollow microspheres used in printing inks, paper and board, nowoven materials, body fillers, paints, explosives... 

Organic spheres are predominantly polymeric, consisting of synthetic or natural polymers. The field of polymeric nano- and microparticles is vast, comprising, for instance, latex particles for coatings, hollow particles for syntactic foams, and microcapsules for foaming and additive release. In addition, there are core-shell microbeads and coated polymeric particles, where the particles can exhibit multiple functionalities, thanks to the individual features of their different layers 1]. As fillers in thermosets and thermoplastics, hollow microspheres and expandable microcapsules are among the most frequently used in commercial applications. 

Kron, A. (2005) Low weight filler -thermally expandable hollow polymer microspheres. Proceedings of the High Performance Fillers RAPRA Conference, March 2005, Cologne, Germany. 

Microspheres ml-kr9- sfirs (1894) n. Tiny, hollow spheres of glass or plastic used as fillers to impart low density to plastics, such plastics being known as syntactic foams. Plastics used to make microspheres include phenohc, epoxy and a co-polymer of vinylidene chloride and acrylonitrile. The last contains a heat-activated blowing agent that expands the spheres either before their incorporation into a matrix polymer or afterward. The co-polymer spheres impart better mechanical properties to the matrix than do the glass or epoxy microspheres. 

Perlite por- lit [F, fr. perle pearl] (1833) A siliceous lava which, when heated to 720—1,090°G, expands to 10—20 times its original volume, forming tiny, hollow, spherical bubbles. Perlite is much used as an ingredient of lightweight concrete and as a density-lowering filler for plastics. See also Microspheres. 

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