Novel Isocyanurate Foams Containing No Flame Retardant Additives

Reymore, H.E.; Lockwood, R. J.; Ulrich, H.

doi:10.1177/0021955x7801400604

Cited by 18 publications

(8 citation statements)

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“…[11] The flammability of urethane foams was proposed to be decreased recently by increasing the proportion of isocyanurate in the composition. [12][13][14][15] Hauk et al [16] proposed a possible reactions mechanism for the combustion process of a poly(aminoarylisocyanurate) containing thermoset resin. In contrast to its good flame-retardancy CYA has quite poor mechanical properties because of its heterogeneous structure, shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Fire Retarded Insulating Sheets from Recycled Materials

Matko

Keszei

Csontos

et al. 2006

Macromolecular Symposia

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Summary: In this work we aimed at forming partially recycled polymer composites of appropriate mechanical properties and flame retardancy. Multilayer composite structures proved to be suitable to fulfill all of these requirements. Core-shell structures presented here contain two-component thermosets, i.e. epoxy, recycled polyurethane and polyisocyanurate, as matrices reinforced with waste fillers such as short basalt fibers and wood chips. Flame retardancy and mechanical properties of the core-shell structures were investigated by the conventional methods of characterization. The developed cost-effective multilayer composites can be applied as heat and sound insulating panels e.g. multifunctional sheets for construction or automotive industry.

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Section: Resultsmentioning

confidence: 99%

Fire Retarded Insulating Sheets from Recycled Materials

Matko

Keszei

Csontos

et al. 2006

Macromolecular Symposia

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“…In order to allow quantitative integration of the carbonyl peaks, 25 s of a relaxation delay was required and chromium(III) acetylacetonate (Cr(acac) 3 ) was used as a relaxation agent. 42−44 In the quantitative 13 C NMR spectrum shown in Figure 1c, the peaks at 153.6, 151.6, 156.0, and 150.2 ppm were assigned to carbonyl carbon atoms of urethane, allophanate (two peaks), and isocyanurate respectively. 39,40 The molar ratio of urethane:allophanate:isocyanurate (U:A:ISR) was calculated as 1:0.9:1.5 based on the integrals of carbonyl carbon peaks.…”

Section: Preparation Of the Pir-dehp Prepolymer M O N O F U N C T I O...mentioning

confidence: 99%

“…As soon as the viscosity increased strongly, the reaction was quenched by diethylene glycol bis-chloroformate (DGBCF) (Figure S4). The formation of isocyanurate was monitored with both 13 C NMR spectroscopy at 150.1 ppm (carbonyl carbon) (Figure 1a) 39,40 and with FT-IR at 1704 cm −1 (C�O stretching) and 1410 cm −1 (C−N stretching) (Figure 1b). 41 After reaction, the urethane (U), allophanate (A), and isocyanurate (ISR) ratio in the PIR-DEHP prepolymer was further determined by 13 C NMR spectroscopy.…”

Section: Preparation Of the Pir-dehp Prepolymer M O N O F U N C T I O...mentioning

confidence: 99%

Phosphorus-Containing Polyisocyanurate Elastomers for Flame Retardant Application

Guo

Kleemann²,

Sijbesma

et al. 2023

ACS Appl. Polym. Mater.

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Polyurethane (PU) is one of the most common and versatile polymers in many applications especially in the construction and automotive industry where the improvement of thermal stability and flame retardancy is crucial. As polyisocyanaurate (PIR) is well known to have a high decomposition temperature and phosphorus motifs are usually used as flame retardants in polymers, the introduction of PIR and phosphorus motifs in polyurethanes can lead to PUs with high thermal stability and flame retardancy. We investigated a synthetic pathway to introduce polyisocyanurate (PIR) and phosphorus motifs in polyurethanes via co-trimerization of 4,4′-methylene diphenyl diisocyanate (4,4′-MDI) and monoisocyanate, which was synthesized from the reaction between diethyl (hydroxymethyl)phosphonate (DEHP) and 4,4′-MDI. The resulting PIR-DEHP prepolymer was used to prepare PIR-DEHP elastomers in both solvent and solvent-free conditions. The elastomer with polyester polyol and 15 wt % 1,4-butanediol in the polyol component showed high char formation (25.5 wt %) and 55% reduction in the total heat release (THR) relative to the reference elastomer without PIR and phosphorus content. It is expected that the use of the PIR-DEHP prepolymer can be extended to other applications, such as rigid PU foams and compact thermosets where the flame retardancy and bulk reaction conditions are required.

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“…In addition to PU rigid foams, researchers have been developing PIR elastomers via trimerization of isocyanate prepolymers obtained from the reaction between excess of isocyanate and long chain polyols, or via in situ synthesis with isocya-nates, polyols and chain extender reacting in the presence of a trimerization catalyst. [15][16][17][18][19][20] However, the resulting PU materials in both cases have a relatively low PIR content due to the fast increase of viscosity and poor catalyst diffusion during trimerization reaction.…”

Section: Introductionmentioning

confidence: 99%