Sound absorption behavior of flexible polyurethane foams including high molecular-weight copolymer polyol

2017 ◽  
Vol 29 (2) ◽  
pp. 852-859 ◽  
Author(s):  
Giwook Sung ◽  
Jin Seok Kim ◽  
Jung Hyeun Kim
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Sound Absorption ◽  
Polyurethane Foams ◽  
Flexible Polyurethane

scholarly journals The Effects of Various Additive Components on the Sound Absorption Performances of Polyurethane Foams

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Shuming Chen ◽  
Yang Jiang ◽  
Jing Chen ◽  
Dengfeng Wang
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Transmission Loss ◽  
Polyurethane Foams ◽  
Acoustic Properties ◽  
Acoustic Absorption ◽  
Absorption Properties ◽  
Maximum Enhancement ◽  
Flexible Polyurethane ◽  
Pu Foams

Flexible polyurethane (PU) foams comprising various additive components were synthesized to improve their acoustic performances. The purpose of this study was to investigate the effects of various additive components of the PU foams on the resultant sound absorption, which was characterized by the impedance tube technique to obtain the incident sound absorption coefficient and transmission loss. The maximum enhancement in the acoustic properties of the foams was obtained by adding fluorine-dichloroethane (141b) and triethanolamine. The results showed that the acoustic absorption properties of the PU foams were improved by adding 141b and triethanolamine and depended on the amount of the water, 141b, and triethanolamine.

Polyurethane one-component foam formulation optimization for low free isocianate monomer content

2016 ◽  
Vol 53 (2) ◽  
pp. 167-179 ◽  
Author(s):  
Ana C Marques ◽  
Helena Dias ◽  
Sandro Matos ◽  
Bruno Sargaço ◽  
Ricardo Simoes ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Flame Retardant ◽  
High Molecular Weight ◽  
Polyurethane Foams ◽  
Toluene Diisocyanate ◽  
Chain Extension ◽  
Methylene Diphenyl Diisocyanate ◽  
Monomer Content ◽  
Aerosol Cans ◽  
One Year

Recent changes in legislation have forced one-component foam producers to drop the amount of free monomeric isocyanate in their polyurethane systems. Also, it is required that commercial polyurethane aerosol cans exhibit at least one year of shelf life and polyurethane foams must be classified as B2 on the fire testing following DIN 4102. This paper reports on a systematic optimization study of polyurethane formulations dedicated to address these current industry requirements. A one-component foam system exhibiting simultaneously all of these parameters was achieved by reacting conventional diols, a relatively low-molecular weight monol (2-ethylhexanol), a flame retardant high-molecular weight monol (tris(bromoneopentyl)alcohol), a methylene diphenyl diisocyanate-based prepolymer (GreenAdduct 13), and a small amount of 2,4′-toluene diisocyanate. The use of monols allows producing prepolymers with low free methylene diphenyl diisocyanate by preventing chain extension and, therefore, avoiding extreme viscosity build-up. Toluene diisocyanate also promotes a lower viscosity inside the aerosol can, which enables the use of high enough quantities of high-molecular weight flame retardant monol to achieve a B2 fire test classification.

scholarly journals Nitrogen/phosphorus synergistic flame retardant-filled flexible polyurethane foams: microstructure, compressive stress, sound absorption, and combustion resistance

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21192-21201 ◽  
Author(s):  
Ting-Ting Li ◽  
Mengfan Xing ◽  
Hongyang Wang ◽  
Shih-Yu Huang ◽  
Chengeng Fu ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foam ◽  
Sound Absorption ◽  
Heat Insulation ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foam ◽  
Flexible Polyurethane Foam ◽  
Synergistic Flame Retardant ◽  
Flexible Polyurethane ◽  
Nitrogen Phosphorus

Compared with a rigid polyurethane foam, a flexible polyurethane foam (FPUF) has more diversified applications including filtration, sound absorption, vibration-proofing, decoration, packaging, and heat insulation.

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