Preparation of rigid polyurethane foams with powder filler

2012 ◽  
Vol 32 (2) ◽  
Author(s):  
Joanna Paciorek-Sadowska ◽  
Bogusław Czupryński ◽  
Joanna Liszkowska ◽  
Kazimierz Piszczek
Keyword(s):  
Compressive Strength ◽  
Polyvinyl Chloride ◽  
Softening Point ◽  
Processing Parameters ◽  
Polyurethane Foams ◽  
Favorable Effect ◽  
Start Time ◽  
Rigid Polyurethane Foams ◽  
Powder Filler ◽  
Foam Plastics

Abstract The diversified properties of polyurethane (PUR) foam plastics result from differences in the receipts applied during their preparation. The preparation of rigid polyurethane-polyisocyanurate foams (PUR-PIR) with application of different amounts of polyvinyl chloride (PVC) s-70 as a filler is described in this study. It was found that application of PVC s-70 has an effect on the prolongation of processing parameters, i.e., start time and, to a greater extent, expansion and gelation times. Moreover, it was found that introduction of filler into the foam composition causes a reduction in the capacity of the foam to absorb water; however, a distinct change in the amount of closed cells in comparison with standard foam was not observed. A favorable effect of filler on brittleness and flammability of PUR-PIR foams (significant reduction) as well as on compressive strength and softening point (a significant increase in these values) was observed.

The Synthesis and Application of a Novel Class of Polyols for Preparation of Polyurethane

2013 ◽  
Vol 357-360 ◽  
pp. 1441-1445
Author(s):  
Xiao Lin Li ◽  
Zheng Fang ◽  
Dong Ji ◽  
Zhi Dong Wan ◽  
Kai Guo
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Polyurethane Foams ◽  
Low Density ◽  
Cell Content ◽  
Low Thermal Conductivity ◽  
High Compressive Strength ◽  
Rigid Polyurethane Foams ◽  
Closed Cell ◽  
Rigid Foams

The synthesis of a novel class of diamine-based polyols derivatives and the potentials and the limitations of these polyols were reported. This class of diamine-based polyols with high hydroxyl values and no acid values can be used in rigid polyurethane foams. The prepared rigid foams show the properties of low density, high closed cell content, low thermal conductivity, and high compressive strength.

scholarly journals POSS Compounds as Modifiers for Rigid Polyurethane Foams (Composites)

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1092 ◽  
Author(s):  
Anna Strąkowska ◽  
Sylwia Członka ◽  
Krzysztof Strzelec
Keyword(s):  
Mechanical Properties ◽  
Viscoelastic Behavior ◽  
Physical And Mechanical Properties ◽  
Large Cell ◽  
Processing Parameters ◽  
Polyurethane Foams ◽  
Bending Test ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Rigid Polyurethane Foams ◽  
Cell Shapes

Three types of polyhedral oligomeric silsesquioxanes (POSSs) with different functional active groups were used to modify rigid polyurethane foams (RPUFs). Aminopropylisobutyl-POSS (AP-POSS), trisilanoisobutyl-POSS (TS-POSS) and octa(3-hydroxy-3-methylbutyldimethylsiloxy-POSS (OH-POSS) were added in an amount of 0.5 wt.% of the polyol weight. The characteristics of fillers including the size of particles, evaluation of the dispersion of particles and their effect on the viscosity of the polyol premixes were performed. Next, the obtained foams were evaluated by their processing parameters, morphology (Scanning Electron Microscopy analysis, SEM), mechanical properties (compressive test, three-point bending test, impact strength), viscoelastic behavior (Dynamic Mechanical Analysis, DMA), thermal properties (Thermogravimetric Analysis, TGA, thermal conductivity) and application properties (contact angle, water absorption). The results showed that the morphology of modified foams is significantly affected by the fillers typology, which resulted in inhomogeneous, irregular, large cell shapes and further affected the physical and mechanical properties of the resulting materials. RPUFs modified with AP-POSS represent better mechanical properties compared to the RPUFs modified with other POSS.

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.

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.

Composites of rigid polyurethane foams and silica powder filler enhanced with ionic liquid

2019 ◽  
Vol 75 ◽  
pp. 12-25 ◽  
Author(s):  
Sylwia Członka ◽  
Anna Strąkowska ◽  
Krzysztof Strzelec ◽  
Agnė Kairytė ◽  
Saulius Vaitkus
Keyword(s):  
Ionic Liquid ◽  
Polyurethane Foams ◽  
Silica Powder ◽  
Rigid Polyurethane Foams ◽  
Powder Filler

scholarly journals Open-Cell Rigid Polyurethane Foams from Peanut Shell-Derived Polyols Prepared under Different Post-Processing Conditions

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1392 ◽  
Author(s):  
Guangyu Zhang ◽  
Yumin Wu ◽  
Weisheng Chen ◽  
Dezhi Han ◽  
Xiaoqi Lin ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Dimensional Stability ◽  
Polyurethane Foams ◽  
Environmental Conservation ◽  
Peanut Shell ◽  
Processing Conditions ◽  
Post Processing ◽  
Open Cell ◽  
Rigid Polyurethane Foams

Bio-based polyurethane materials with abundant open-cells have wide applications because of their biodegradability for addressing the issue of environmental conservation. In this work, open-cell rigid polyurethane foams (RPUFs) were prepared with bio-based polyols (BBPs) derived from the liquefaction of peanut shells under different post-processing conditions. The influences of the neutralization procedure and filtering operation for BBPs on the foaming behaviors, density, dimensional stability, water absorption, swelling ratio, compressive strength, and microstructure of RPUFs were investigated intensively. The results revealed that a small amount of sulfuric acid in the polyols exhibited a great impact on physical and chemical properties of RPUFs while the filtering operation for those polyols had a slight effect on the above properties. The RPUFs prepared from neutralized BBPs possessed higher water absorption, preferable dimensional stability and compression strength than that fabricated from the non-neutralized BBPs. Moreover, the prepared RPUFs exhibited preferable water absorption of 636–777%, dimensional stability of <0.5%, compressive strength of >200 KPa, lower swelling rate of ca. 1%, as well as uniform cell structure with superior open-cell rate, implying potential applications in floral foam.

Preparation and Characterization of Soybean Oil-based Flame Retardant Rigid Polyurethane Foams Containing Phosphaphenanthrene Groups

2020 ◽  
Vol 17 (10) ◽  
pp. 760-771
Author(s):  
Qirui Gong ◽  
Niangui Wang ◽  
Kaibo Zhang ◽  
Shizhao Huang ◽  
Yuhan Wang
Keyword(s):  
Soybean Oil ◽  
Flame Retardant ◽  
Chemical Structure ◽  
Cell Structure ◽  
Polyurethane Foams ◽  
Limiting Oxygen Index ◽  
Rigid Polyurethane Foams ◽  
Degradation Activation Energy ◽  
Ft Ir

A phosphaphenanthrene groups containing soybean oil based polyol (DSBP) was synthesized by epoxidized soybean oil (ESO) and 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Soybean oil based polyol (HSBP) was synthesized by ESO and H2O. The chemical structure of DSBP and HSBP were characterized with FT-IR and 1H NMR. The corresponding rigid polyurethane foams (RPUFs) were prepared by mixing DSBP with HSBP. The results revealed apparent density and compression strength of RPUFs decreased with increasing the DSBP content. The cell structure of RPUFs was examined by scanning electron microscope (SEM) which displayed the cells as spherical or polyhedral. The thermal degradation and flame retardancy of RPUFs were investigated by thermogravimetric analysis, limiting oxygen index (LOI), and UL 94 vertical burning test. The degradation activation energy (Ea) of first degradation stage reduced from 80.05 kJ/mol to 37.84 kJ/mol with 80 wt% DSBP. The RUPF with 80 wt% DSBP achieved UL94 V-0 rating and LOI 28.3. The results showed that the flame retardant effect was mainly in both gas phase and condensed phase.

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