Reactivity of the raw materials and their effects on the structure and properties of rigid polyurethane foams

2007 ◽  
Vol 106 (2) ◽  
pp. 1014-1023 ◽  
Author(s):  
Harpal Singh ◽  
T. P. Sharma ◽  
A. K. Jain
Keyword(s):  
Raw Materials ◽  
Polyurethane Foams ◽  
Structure And Properties ◽  
Rigid Polyurethane Foams

Cooperative effect of rapeseed oil-based polyol and egg shells on the structure and properties of rigid polyurethane foams

2020 ◽  
Vol 90 ◽  
pp. 106696 ◽  
Author(s):  
Milena Leszczyńska ◽  
Joanna Ryszkowska ◽  
Leonard Szczepkowski ◽  
Maria Kurańska ◽  
Aleksander Prociak ◽  
...  
Keyword(s):  
Rapeseed Oil ◽  
Cooperative Effect ◽  
Polyurethane Foams ◽  
Structure And Properties ◽  
Rigid Polyurethane Foams ◽  
Egg Shells

Amidic Polyols, New Polyhydroxylic Raw Materials for Rigid Polyurethane Foams

2020 ◽  
pp. 607-608
Author(s):  
M. Ionescu ◽  
S. Mihai ◽  
E. Stepan ◽  
C. Roibu ◽  
V. Preoteasa
Keyword(s):  
Raw Materials ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams

Polyol from spent coffee grounds: Performance in a model pour-in-place rigid polyurethane foam system

2020 ◽  
Vol 56 (6) ◽  
pp. 630-645 ◽  
Author(s):  
Ibrahim Sendijarevic ◽  
Karol W Pietrzyk ◽  
Christi M. Schiffman ◽  
Vahid Sendijarevic ◽  
Alper Kiziltas ◽  
...  
Keyword(s):  
Polyurethane Foam ◽  
Raw Materials ◽  
Intact Cell ◽  
Cell Structure ◽  
Acid Value ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foam ◽  
Spent Coffee Grounds ◽  
Rigid Polyurethane Foams ◽  
Coffee Grounds

The objective of this study was to produce a polyol from spent coffee grounds via acid liquification process that meets performance requirements for use in polyurethane applications. The spent coffee grounds based polyol was characterized and evaluated on a fully catalyzed model rigid polyurethane foam system. The pH of the polyol was 6.8, acid value 4.12 mg KOH/g, and hydroxyl value 302.6 mg KOH/g, which are in the range of polyols used in rigid polyurethane foams. The reactivity study confirmed enhanced reactivity of the spent coffee grounds polyol compared to standard sucrose-glycerol initiated polyether polyols, which can be attributed to higher content of primary reactive hydroxyls. Scanning electron microscopy microphotographs of the foams prepared with 10%, 20%, and 30% spent coffee grounds polyol based on total polyols in the formulation revealed a drained dodecahedron type cell structure with intact cell windows as a clear indication of the closed cell structure typical for the rigid polyurethane foams used in thermal insulation applications. Results of this study confirmed the feasibility to produce polyols from spent coffee grounds with performance characteristics suitable for polyurethane application. The fact that spent coffee grounds are readily available industrial waste generated in instant coffee manufacturing, makes this biomass residue a sustainable source of raw materials for scalable production of polyols for polyurethanes.

scholarly journals Use of a Mixture of Polyols Based on Metasilicic Acid and Recycled PLA for Synthesis of Rigid Polyurethane Foams Susceptible to Biodegradation

2020 ◽  
Vol 22 (1) ◽  
pp. 69
Author(s):  
Joanna Paciorek-Sadowska ◽  
Marcin Borowicz ◽  
Ewelina Chmiel ◽  
Jacek Lubczak
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Raw Materials ◽  
Weight Ratio ◽  
Acid Number ◽  
Polyurethane Foams ◽  
Poly Lactic Acid ◽  
Rigid Polyurethane Foams ◽  
Sustainable Resource Management ◽  
Metasilicic Acid

Two polyol raw materials were obtained in the conducted research, one based on metasilicic acid (MSA), the other based on poly(lactic acid) (PLA) waste. The obtained polyols were characterized in terms of their applicability for the production of rigid polyurethane foams (RPUFs). Their basic analytical properties (hydroxyl number, acid number, elemental analysis) and physicochemical properties (density, viscosity) were determined. The assumed chemical structure of the obtained new compounds was confirmed by performing FTIR and 1H NMR spectroscopic tests. Formulations for the synthesis of RPUFs were developed on the basis of the obtained research results. A mixture of polyols based on MSA and PLA in a weight ratio of 1:1 was used as the polyol component in the polyurethane formulation. The reference foam in these tests was a foam that was synthesized only on the basis of MSA-polyol. The obtained RPUFs were tested for basic functional properties (apparent density, compressive strength, water absorption, thermal conductivity coefficient etc.). Susceptibility to biodegradation in soil environment was also tested. It was found that the use of mixture of polyols based on MSA and PLA positively affected the properties of the obtained foam. The polyurethane foam based on this polyol mixture showed good thermal resistance and significantly reduced flammability in comparison with the foam based MSA-polyol. Moreover, it showed higher compressive strength, lower thermal conductivity and biodegradability in soil. The results of the conducted tests confirmed that the new foam was characterized by very good performance properties. In addition, this research provides information on new waste management opportunities and fits into the doctrine of sustainable resource management offered by the circular economy.

scholarly journals Fly Ash as an Eco-Friendly Filler for Rigid Polyurethane Foams Modification

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6604
Author(s):  
Monika Kuźnia ◽  
Anna Magiera ◽  
Beata Zygmunt-Kowalska ◽  
Katarzyna Kaczorek-Chrobak ◽  
Kinga Pielichowska ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Combustion ◽  
Power Plants ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foam ◽  
Structure And Properties ◽  
Rigid Polyurethane Foams ◽  
Polyurethane Composites ◽  
Thermal Stability Of

There is currently a growing demand for more effective thermal insulation materials with the best performance properties. This research paper presents the investigation results on the influence of two types of filler on the structure and properties of rigid polyurethane foam composites. Fly ash as a product of coal combustion in power plants and microspheres of 5, 10, 15, and 20 wt.%, were used as rigid polyurethane foams modifiers. The results of thermal analysis, mechanical properties testing, and cellular structure investigation performed for polyurethane composites show that the addition of fly ash, up to 10 wt.%, significantly improved the majority of the tested parameters. The use of up to 20 wt.% of microspheres improves the mechanical and thermal properties and thermal stability of rigid polyurethane foams.

Properties of water-blown rigid polyurethane foams with reactivity of raw materials

2004 ◽  
Vol 93 (5) ◽  
pp. 2334-2342 ◽  
Author(s):  
W. J. Seo ◽  
J. H. Park ◽  
Y. T. Sung ◽  
D. H. Hwang ◽  
W. N. Kim ◽  
...  
Keyword(s):  
Raw Materials ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams
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