Conventional Polyurethane Foam Research Articles

1,1,1,2-Tetrafluoroethane as the Primary Blowing Agent for Rigid Polyurethane Foams Using Conventional Foam Mixing Equipment

In previous reports we have shown that chlorodifluoromethane (HCFC-22) can be used in liquid resin systems as the primary blowing agent for polyurethane foams. We have now found that the same techniques pioneered using HCFC-22 can be used to run foam systems blown by HFC-134a on conventional foam equipment. Like HCFC-22, HFC-134a can be dissolved into the resin. Using both sucrose and amine initiated polyols, foams have been made with densities dawn to 1.4 PCF. HFC-134a levels up to 25 weight percent of the resin have been run, without significant modification, on conventional polyurethane foam equipment. The HFC-134a blown foams have good closed cell structure, good dimensional stability, low density, and in general, good physical properties

A New Flame Retardant Additive for Conventional Flexible Polyurethane Foams

A New Flame Retardant Additive for Conventional Flexible Polyurethane Foams

A New Flame Retardant Additive for Conventional Flexible Polyurethane Foams

A New Flame Retardant Additive for Conventional Flexible Polyurethane Foams

Polyisobutylene‐based urethane foams. II. Synthesis and properties of novel polyisobutylene‐based flexible polyurethane foams

AbstractNovel polyisobutylene‐based flexible polyurethane foams (PIB–PUF) have been prepared manually by the prepolymer method using three‐arm star hydroxyl‐terminated polyisobutylenes (PIB–triols) and toluene diisocyanate (TDI). Solvent extraction and IR spectroscopy of PIB–PUFs indicated essentially complete crosslinking. Conventional polyether‐based polyrethane foams (PE–PUFs) and polybutadiene‐based polyurethane foams (PBD–PUFs) have also been prepared by the same method and select physical‐mechanical properties of all these urethane foams, such as tensile strength, elongation, resilience, water permeability, hot air stability, and hydrolytic stability, have been examined and compared. Although the density of PIB–PUF is lower than that of PE–PUF, its tensile strength is superior to the latter. Elongation of PIB–PUF is almost the same as those of the other foams. The PIB–PUF exhibits low resilience which indicates good damping properties. Due to the hydrophobicity of the soft segment, PIB–PUF exhibits very low water permeability. The hydrolytic and hot air stability of PIB–PUFs are outstanding. Attempts have been made to determine gas permeabilities; however, due to the open‐cell nature of the foams, these studies could not be completed. The new PIB‐based urethane foams combine excellent thermal, environmental, barrier, and mechanical properties, unmatched by conventional PUFs.

Influence of Flexible Polyurethane Foams on Upholstery Fabric-Foam Mock-ups Ignitions by Cigarettes

Fabric and polyurethane foam are major components in most upholstered fur niture mock-up systems. Their influence on the system propensity to ignite when exposed to a lit cigarette can be estimated by means of a logistic model. The model, which estimates percent ignition, is uniquely determined by the significant physical properties of the fabric, foam and cigarette employed in the test. Varying the physical properties or weighted characteristic of one com ponent in the fabric/foam/cigarette mock-up system while holding the other two constant allows sensitivity analysis. The logistic model development rationale along with the selection criteria for the fabrics, foams and cigarettes are presented. Weight and proclivity of the fabric, and air flow of conventional polyurethane foam were found to be the major physical properties of the mock-up system substrate influencing ignition rates.