Abstract:
A process for the production of insecticide-modified bead material composed of expandable polystyrene (EPS) by extrusion, encompassing the steps of a) mixing, in a mixer, to incorporate a blowing agent and at least one insecticide from the group of the phenylpyrazoles, chlorfenapyr and hydramethylnon into a polymer melt which comprises at least one polystyrene, based on a vinylaromatic monomer, b) discharging the polymer melt comprising blowing agent, and c) pelletizing the polymer melt comprising blowing agent.
Abstract:
Insecticide-modified bead material composed of expandable polystyrene (EPS), comprising at least one insecticide selected from the group of the insecticidal phenylpyrazoles, chlorfenapyr and hydramethylnon which is distributed in molecular dispersion in the polystyrene matrix.
Abstract:
Disclosed are expandable styrene polymers (EPS) containing, in relation to the styrene polymer, a) 0.05 to 5 percent by weight of an organic bromine compound containing a minimum of 50 percent by weight of bromine as a flameproofing agent, b) 0.05 to 2 percent by weight of a flameproofing synergist, c) 1 to 5 percent by weight of a metallic salt as an acid collector. Also disclosed is a method for producing said expandable styrene polymers.
Abstract:
The invention relates to a method for producing hollow bodies having freely displaceable particles enclosed in the hollow body, wherein a) a gel-forming liquid in which the particles are suspended is brought into a cross-linking bath, b) the gel cores that form are isolated, c) the cores are coated with a composition comprising sinterable material and a binder, and d) the coated cores are subjected to a heat treatment wherein the gel and the binder are expunged and the sinterable material is sintered into a closed shell. The gel forming material is, for example, sodium alginate, and the cross-linking bath comprises calcium ions. The particles are selected, for example, from ZrO2, AI2O3, TiO2, and SiO2 or mixtures thereof. The sinterable material is, for example, a metal powder such as carbonyl iron powder.
Abstract:
Ein Verfahren zur Herstellung von antistatisch ausgerüsteten, expandierbaren, thermoplastischen Polymerpartikel, durch Mischen und Bilden einer Polymerschmelze aus den Komponenten A) 45 bis 97,8 Gew.-%, bevorzugt 55 bis 78,1 Gewichtsprozent eines Styrolpolymeren, B1) 1 bis 45 Gew.-%, bevorzugt 7 bis 15 Gewichtsprozent eines Polyolefins mit einem mittels DSC bei einer Aufheizrate von 10°C/Minute ermitteltem Schmelzpunkt im Bereich von 105 bis 140°C, B2) 0 bis 25 Gew.-%, bevorzugt 5 bis 10 Gewichtsprozent eines Polyolefins mit einem mittels DSC bei einer Aufheizrate von 10°C/Minute ermitteltem Schmelzpunkt unter 105°C, C1) 0,1 bis 25 Gew.-%, 6 bis 15 Gewichtsprozent eines Styrol-Butadien- oder Styrol-Isopren-Blockcopolymeren, C2) 0,0 bis 10 Gew.-%, bevorzugt 0,8 bis 3 Gewichtsprozent eines Styrol-Ethylen-Butylen-Blockcopolymeren, D) 1 bis 15 Gew.-%, bevorzugt 3 bis 10 Gewichtsprozent eines Treibmittels, E) 0 bis 5 Gew.-%, bevorzugt 0,3 bis 2 Gewichtsprozent eines Nukleierungsmittels, und F) 0,1 bis 5 Gew.-%, bevorzugt 1 bis 3 Gew.-% eines Antistatikum, wobei die Summe aus A) bis F) 100 Gew.-% ergibt, und Extrudieren der Polymerschmelze durch eine Düsenplatte mit anschließender Unterwassergranulierung, die nach dem Verfahren erhältlichen, antistatisch ausgerüsteten, expandierbaren, thermoplastischen Polymerpartikel und deren Verarbeitung zu antistatischen ausgerüsteten Partikelschaumstoffformteilen.
Abstract:
La invención se refiere a un método para producir partículas de polímero termoplásticas expandibles por post-impregnación de partículas de polímero termoplásticas que contienen por lo menos un polímero de estireno y por lo menos una poliolefina, usando un agente soplador. Dicha post-impregnación se lleva a cabo predominantemente en la fase de gas.
Abstract:
Disclosed is a bead material composed of expandable polystyrene (EPS), coated with (A) one or more insecticides, preferably selected from the group consisting of fipronil, hydramethylnon and chlorfenapyr;(B) one or more glycerol esters,(C) optionally one or more polymeric binders selected from acrylate resins, aqueous polymer dispersions, or waxes; and(D) optionally further additives. A process for the production of the molding by press molding is also disclosed, wherein: (I) an EPS bead material is charged to a gas-permeable mold; (II) within the closed mold, the charge of bead material is press-molded to give a molding, with volume reduction;(III) the molding is hardened by controlling its temperature to from 20 to 100 Deg. C; and (IV) the resultant molding is removed from the mold. Further disclosed is another process for the production of the molding according by foaming-to completion, wherein: (I) an EPS bead material is charged to a gastight mold;(II) within the closed mold, the charge of bead material is foamed to completion by controlling its temperature to from 60 to 120 Deg. C, whereupon the bead material fuses to give the molding; and(III) the resultant molding is removed from the mold. These beads are suitable for making moldings that are used as insulation material in the construction industry and these mouldings are also suitable for the protection of buildings against termites.