Mechanical and thermophysical properties of polyurethane foam thermal insulation coatings intended for controlling the stability of deep quarry banks

1998 ◽  
Vol 34 (4) ◽  
pp. 317-319
Author(s):  
V. Yu. Izakson ◽  
E. P. Aprosimova ◽  
S. P. Shkulev
Keyword(s):  
Polyurethane Foam ◽  
Thermal Insulation ◽  
Thermophysical Properties ◽  
The Stability

The extraction of alkali metal picrates by polyurethane foam using crown ether

1981 ◽  
Vol 59 (10) ◽  
pp. 1490-1496 ◽  
Author(s):  
Anjum S. Khan ◽  
W. G. Baldwin ◽  
A. Chow
Keyword(s):  
Crown Ether ◽  
Alkali Metal ◽  
Polyurethane Foam ◽  
Dissociation Constants ◽  
Extraction Constant ◽  
Ion Pair ◽  
Constant Sequence ◽  
Extraction Constants ◽  
The Stability ◽  
Ether Complex

The distribution of alkali metal picrates between water and polyurethane foam was studied in the presence of dicyclohexyl 18-crown-6 (DCHC-6). The extraction constants and dissociation constants for the ion pair (MCrA) in polyurethane foam were determined. The extraction constant sequence of the alkali metal ions with DCHC-6 is K+ > Rb+ > Cs+ > Na+ and mainly depends on the stability of the alkali metal – crown ether complex.

scholarly journals Waste Utilization: Insulation Panel from Recycled Polyurethane Particles and Wheat Husks

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3075
Author(s):  
Štěpán Hýsek ◽  
Pavel Neuberger ◽  
Adam Sikora ◽  
Ondřej Schönfelder ◽  
Gianluca Ditommaso
Keyword(s):  
Thermal Conductivity ◽  
Winter Wheat ◽  
Polyurethane Foam ◽  
Thermal Insulation ◽  
Waste Utilization ◽  
Waste Materials ◽  
Uptake Coefficient ◽  
Coefficient Of Thermal Conductivity ◽  
Nominal Density ◽  
Wheat Husk

This study provides a solution for the utilization of two waste materials, namely the residues of soft polyurethane foam from the production of mattresses and winter wheat husks. Thermal insulation panels with a nominal density of 50–150 kg/m3, bonded one-component moisture curing polyurethane adhesive, were developed, and the effect of the ratio between recycled polyurethane foam and winter wheat husk on internal bond strength, compressive stress at 10% strain, water uptake, coefficient of thermal conductivity, and volumetric heat capacity was observed. The developed composite materials make use of the very good thermal insulation properties of the two input waste materials, and the coefficient of thermal conductivity of the resulting boards achieves excellent values, namely 0.0418–0.0574 W/(m.K). The developed boards can be used as thermal insulation in the structures of environmentally friendly buildings.

Research on Impact Factors of Thermal Insulation Material Based on Grey Relational Analysis

2011 ◽  
Vol 328-330 ◽  
pp. 1377-1380 ◽  
Author(s):  
Xiao Gang Zhao ◽  
Yi Zhou ◽  
Shi Xiang Pan
Keyword(s):  
Polyurethane Foam ◽  
Thermal Insulation ◽  
Field Experiments ◽  
Impact Factors ◽  
Insulation Material ◽  
Rigid Polyurethane Foam ◽  
Relational Analysis ◽  
Grey Relational ◽  
Insulation Quality

According to application of thermal insulation materials in the practical construction of electrical heat tracing in viscous oil pipeline, impact factors of rigid polyurethane foam widely used as new insulation material are systemically analyzed by Grey Relational Analysis (GRA) in the theory of Grey System to find out priorities among those factors. To further study their performances and to improve the quality of constructions, ten field experiments were carried out in Tanggula Mountain. The foaming conditions and the performances of the rigid polyurethane foam were recorded to be analyzed by GRA. The analysis results, acting as scientific guidance for construction, show that the insulation quality of rigid polyurethane foam is mainly determined by the ratio of components, thus the priority is to control such dominant factor and overall consideration of other factors should be taken to ensure insulation quality in the foaming process. More field experiments prove that the ratio should be controlled between 1.15 and 1.18 to ensure the thermal insulation.

Applications of Rigid Polyurethane Foam Insulation Materials in Architectural Energy Conservation

2012 ◽  
Vol 608-609 ◽  
pp. 1783-1785
Author(s):  
Xiao Ying Zhang ◽  
Guo Hui Wang ◽  
Dan Liu ◽  
Ying Wang
Keyword(s):  
Energy Conservation ◽  
Polyurethane Foam ◽  
Thermal Insulation ◽  
Small Proportion ◽  
High Efficiency ◽  
High Price ◽  
Rigid Polyurethane Foam ◽  
Smoke Toxicity ◽  
Application Development ◽  
Paper Briefly

This paper briefly introduces the main properties and four systems of rigid polyurethane thermal insulation foam intended for use in buildings for energy conservation purposes, and application development at home and abroad. Although the applications of polyurethane are widespread in architectural energy conservation, there are some problems just as high price, smoke toxicity, fire safety and so on thus it still occupies a small proportion in buildings for energy conservation purposes. It is no doubt that the function with high efficiency of thermal insulation, fireproof and low smoke density of rigid polyurethane foam conservation products is our goal.

scholarly journals Experimental Study on Polyurethane Foam as Thermal Insulation Material

1966 ◽  
Vol 1966 (120) ◽  
pp. 236-245
Author(s):  
Shiro Watanabe ◽  
Akira Kamimura ◽  
Yoshiyuki Izutsu ◽  
Masaru Ishida
Keyword(s):  
Experimental Study ◽  
Polyurethane Foam ◽  
Thermal Insulation ◽  
Insulation Material ◽  
Thermal Insulation Material

scholarly journals Proposal for Cryogenic Deburring Equipment’s Design and Thermal Insulation

2019 ◽  
Vol 299 ◽  
pp. 01013
Author(s):  
Rares Campean ◽  
Liana Hancu
Keyword(s):  
Heat Transfer ◽  
Liquid Nitrogen ◽  
Polyurethane Foam ◽  
Thermal Insulation ◽  
Production Capacity ◽  
Insulating Layer ◽  
Thermal Transfer ◽  
Plastic Parts ◽  
Cryogenic Conditions

In the paper are presented elements of the deburring technology of rubber or plastic parts in cryogenic conditions. There is a proposal for deburring equipment that follows: simplicity in use, increased production capacity and reduced consumption of liquid nitrogen. The heat transfer through the insulating layer is calculated using several types of thermal insulation: perlite powder, spray-on polyurethane foam and aerogel blanket. The obtained results are used for the design of a cryogenic deburring equipment where the thermal transfer is minimal.

scholarly journals Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China

2019 ◽  
Vol 11 (13) ◽  
pp. 3495 ◽  
Author(s):  
Qinglin Li ◽  
Haibin Wei ◽  
Peilei Zhou ◽  
Yangpeng Zhang ◽  
Leilei Han ◽  
...  
Keyword(s):  
Moisture Content ◽  
Thermal Insulation ◽  
Composite Layer ◽  
Solid Particles ◽  
Dry Density ◽  
Silty Clay ◽  
Insulation Property ◽  
Frost Depth ◽  
The Stability ◽  
Thermal Insulation Property

For strengthening sustainability of subgrade life-cycle service performance and storing industry solid wastes in seasonally frozen regions, compared to previous research of modified silty clay (MC) which consisted of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identified for the first time, the variations in the thermal insulation capability of MC with different levels of dry density and moisture content. Taking into consideration the effects of 0–20 freeze-thaw (F-T) cycles by a laboratory test, and by the numerical simulation of coupling moisture-temperature, while considering the effects of F-T cycles, the thermal insulation capability of the MC board and the XPS board were studied quantitatively. The testing results show that the thermal conductivity of MC and SC gradually decreases as the number of F-T cycles increases, and that of the XPS board increases with the increased number of F-T cycles, and tend to be of a constant value of 0.061 W/m/K after 17 F-T cycles. The specific heat capacity of the solid particles of the MC, SC, and XPS board does not change regularly as their moisture content, and the number of F-T cycles change, and their variations are in the range of the test error (2%). Simulation results show that MC has the advantage of the thermal insulation property to reduce the frost-depth of 0.21 m, and the thermal insulation property of the composite layer consisting of the MC and XPS board is greater to reduce the frost-depth of 0.55 m, so that it can protect both the SC and sand gravel of the experimental road from the frost heave damage. The research methods and results are very significant in accurately evaluating the thermal insulation capacity and the sustainability of MC and the composite layer consisting of the MC and XPS board, strengthening the stability of the subgrade and increasing the availability of industrial waste.

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