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B. Czupryński

Trial applications of domestic surfactants to pro duce rigid polyurethane–polyisocyanurate (pur-pir) foams

Polimery 1998, No 2, 109

DOI: dx.doi.org/10.14314/polimery.1998.109


Several „Rokita" NZPO's surfactants (cf. Table 1) were tried to replace the imported Silicone L-5420 to make rigid PUR-PIR foams. Rokafenol N-8, Rokacet R-26, Rokacet 0-7, Rokanols 0-3, L-3 and L-4, and Rokopols 30 p 10 and 30 p 9 proved to be individually useless: they failed to increase the surface viscosity of the reacting components; the porofor was leaving the PUR mass and the resulting foam was either down or half-grown only. Mixtures of the L-5420 (0.5—0.25 wt.% based on the total polyetherol weight) with 1.5—1.75 wt. % of Rokafenol N-8 or Rokacet R-26 allowed to prepare rigid PUR-PIR foams with cell structures and other property data consistent with those of master foams prepared with the L-5420 only (cf. Table 3, foams 1—3, 6, 7, 34, 36, 38 and 39; cf. Table 2 for foam compositions). Foam properties were also studied and characterized in relation to the nature of the porofor applied (Freon 11; methylene chloride —water).

Keywords: rigid polyurethane-polyisocyanurate foams, surface active agents, porofors, physical, mechanical and thermal properties of foams

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