Strategy for preparation of microcellular rigid polyurethane foams with uniform fine cells and high expansion ratio using supercritical CO2 as blowing agent

2019 ◽  
Vol 153 ◽  
pp. 104601
Author(s):  
Ze Yang ◽  
Dongdong Hu ◽  
Tao Liu ◽  
Zhimei Xu ◽  
Ling Zhao
Keyword(s):  
Supercritical Co2 ◽  
Expansion Ratio ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Blowing Agent

1,1,2-Trifluoroethane (HFC-143):Zero-ODP Blowing Agent for Rigid Polyurethane Foams Using Conventional Dispensing Equipment

1995 ◽  
Vol 31 (6) ◽  
pp. 513-531
Author(s):  
P. P. Barthelemy ◽  
A. Leroy ◽  
J. A. Franklin ◽  
L. Zipfel ◽  
W. Krücke
Keyword(s):  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Blowing Agent

Formic acid as a co-blowing agent in rigid polyurethane foams

1998 ◽  
Vol 34 (9) ◽  
pp. 1233-1241 ◽  
Author(s):  
M. Modesti ◽  
N. Baldoin ◽  
F. Simioni
Keyword(s):  
Formic Acid ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Blowing Agent

HFC-365mfc: A Versatile Blowing Agent for Rigid Polyurethane Foams

1999 ◽  
Vol 35 (4) ◽  
pp. 328-344 ◽  
Author(s):  
L. Zipfel ◽  
K. Börner ◽  
W Krücke ◽  
P Barthélemy ◽  
P Dournel
Keyword(s):  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Blowing Agent

scholarly journals Preparation and Characterization of Rigid Polyurethane Foams with Different Loadings of Lignin-Derived Polycarboxylic Acids

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Ruiqi Wang ◽  
Bing Zhou ◽  
Yanchao Zhu ◽  
Zichen Wang
Keyword(s):  
Compressive Strength ◽  
Cell Walls ◽  
Water Resistance ◽  
Expansion Ratio ◽  
Polyurethane Foams ◽  
Oxidative Modification ◽  
Rigid Polyurethane Foams ◽  
Polycarboxylic Acids ◽  
Humid Environment

Lignin was modified by oxidation to prepare lignin-derived polycarboxylic acids (LPCAs). LPCAs can be introduced into rigid polyurethane foams (RPUFs) via 1,4-dioxane. The expansion ratio and compressive strength of RPUFs were observed. When the loading of LPCAs was 0.67 wt% (based on polyol), the compressive strength of RPUF was the highest and was about 59.2% higher than that of the blank RPUF. The reinforcing mechanism of LPCAs was supposed that the interactions between LPCAs and RPUFs increased the strength of the cell walls. When the loading of LPCAs was less than 0.33 wt%, the expansion ratio of RPUFs increased slightly. The water resistance of RPUFs was not affected by LPCAs, suggesting that RPUFs with LPCAs could be used in a humid environment. Besides, the application of the oxidative modification products of lignin was broadened.

Effect of different concentration of rapeseed oil and recycled poly (ethylene terephthalate) in polyols for rigid polyurethane foams

2016 ◽  
Vol 54 (2) ◽  
pp. 161-177 ◽  
Author(s):  
Aiga Ivdre ◽  
Anda Fridrihsone-Girone ◽  
Arnis Abolins ◽  
Ugis Cabulis
Keyword(s):  
Thermal Insulation ◽  
Rapeseed Oil ◽  
Ethylene Terephthalate ◽  
Polyurethane Foams ◽  
Raw Material ◽  
Rigid Polyurethane Foams ◽  
Blowing Agent ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

In this research, polyols from rapeseed oil and recycled poly(ethylene terephthalate) were synthesized by two-step continuous synthesis with a different rapeseed oil and poly(ethylene terephthalate) concentration. All rapeseed oil/poly(ethylene terephthalate) polyols showed complete compatibility with blowing agent Solkane 365/227. The resulting polyols were used to prepare rigid polyurethane foams which were characterized with various techniques for determination of their physical, mechanical and thermal insulation properties. The effect of rapeseed oil and poly(ethylene terephthalate) concentrations in polyols on the characteristics of rigid polyurethane foams was investigated. The results showed that obtained rigid polyurethane foams were suitable for thermal insulation appliance. Also, the potential use of rapeseed oil as raw material combined with poly(ethylene terephthalate) to synthesize polyols with good compatibility with blowing agent was confirmed.

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