Absorptive and Biodegraded Polyurethane Foamed Urea

2010 ◽  
Vol 152-153 ◽  
pp. 131-135
Author(s):  
Jian Li ◽  
Xun Zhang Yu ◽  
Kai Zhang
Keyword(s):  
Polyurethane Foam ◽  
Slow Release ◽  
Raw Materials ◽  
Polyurethane Foams ◽  
Carrier Material ◽  
Konjac Flour ◽  
Flexible Polyurethane ◽  
Polyether Polyol

In this article, konjac flour, super absorptive resin and pellet urea were added into flexible polyurethane foamed plastic with polyether polyol and isocyanate as the raw materials by a new water-foamed technology to manufacture a kind of absorptive and biodegraded polyurethane foamed fertilizer. Polyurethane foam was used as a carrier material and konjac flour was used as a biodegradable agent. The results showed that the slow-release velocity of urea could be controlled by regulating the densities of polyurethane foams, the content of konjac flour and super absorptive resin. The carrier material could be degraded konjac flour by naturally.

scholarly journals Advances in Low-Density Flexible Polyurethane Foams by Optimized Incorporation of High Amount of Recycled Polyol

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1736
Author(s):  
Gabriel Kiss ◽  
Gerlinde Rusu ◽  
Geza Bandur ◽  
Iosif Hulka ◽  
Daniel Romecki ◽  
...  
Keyword(s):  
Polyurethane Foam ◽  
Raw Materials ◽  
Polyurethane Foams ◽  
Low Density ◽  
Emission Data ◽  
Polyurethane Waste ◽  
Volatile Organic ◽  
Foam Properties ◽  
Flexible Polyurethane ◽  
First Time

An industrially manufactured recycled polyol, obtained by acidolysis process, was for the first time proved to be a possible replacement of the reference fossil-based polyol in a low-density formulation suitable for industrial production of flexible polyurethane foams. The influence of increasing recycled polyol amounts on the properties of the polyurethane foam has been studied, also performing foam emission tests to evaluate the environmental impact. Using 10 pbw recycled polyol in the standard formulation, significant differences of the physical properties were not observed, but increase of the recycled polyol amount to 30 pbw led to a dramatic decrease of the foam air flow and a very tight foam. To overcome this drawback, N,N′-bis[3-(dimethylamino)propyl]urea was selected as tertiary amine catalyst, enabling the preservation of foam properties even at high recycled polyol level (30 pbw). Foam emission data demonstrated that this optimized foam formulation also led to an important reduction of volatile organic compounds. The results open the way for further optimization studies in low-density flexible polyurethane foam formulations, to increase the reutilization of the polyurethane waste and reduce the amount of petroleum-based raw materials.

scholarly journals ESTUDO DA VIABILIDADE TÉCNICA DO PROCESSAMENTO DE RESÍDUOS DE ESPUMA FLEXÍVEL DE POLIURETANO POR UM MOINHO DE FACAS

2020 ◽  
Vol 11 (1) ◽  
pp. 72
Author(s):  
Marcio Eduardo Marquez ◽  
Fabrício Celso
Keyword(s):  
Particle Size ◽  
Polyurethane Foam ◽  
Material Flow ◽  
Process Capability ◽  
Polyurethane Foams ◽  
Industrial Scale ◽  
Toilet Seat ◽  
Flexible Polyurethane Foam ◽  
Flexible Polyurethane

ResumoA necessidade de encontrar meios para reciclar materiais que até então eram apenas descartados no meio ambiente traz também a necessidade de conhecermos a viabilidade de alguns processos em meio industrial, avaliando-os não apenas financeira, mas também tecnicamente, por meio do uso de equipamentos de fácil acesso, manuseio e manutenção. Pensando nisso, este trabalho busca aplicar o processo de trituração por moinho de facas a espumas flexíveis de poliuretano, nas quais ainda se percebe carência de estudos em se tratando de sua redução de partículas por meio de processos industriais. Com o uso de um moinho de facas, buscou-se moer aparas da fabricação de assentos sanitários, sendo que a capacidade do processo e a granulometria final do material triturado foram quantitativamente avaliados e o fluxo de material bem como a moagem em si, foram avaliados qualitativamente. Com uma capacidade aproximada de 1 kg/h, uma granulometria apresentando 46,3% das partículas com dimensões de 2,01 a 4,00mm, fluxo e moagem insatisfatórios, este processo, tal como estudado neste trabalho, foi considerado ineficiente na busca de trituração da espuma flexível de poliuretano, mantendo a necessidade de buscar ainda, em meio industrial, solucionar um problema de processo de reciclagem deste material.Palavras-chave: Espuma Flexível de Poliuretano. Moinho de facas. Capacidade. Granulometria. ABSTRACTThe need of to find ways to recycle materials those only were leave on the environment, brings the need in to know the viability of some processes in industrial scale, evaluating them not just financially form but technically to, by the use of commun, and cheaps, and easily maintenece equipements.Therefore, this paper aims to apply the grind process by knife mill to flexible polyurethane foams those don’t has a great variety of studys about their reduction particle size by processes in industrial scale. Using a knife mill, some foam burrs from the toilet seat fabrication were grinded, and the process capability, as much as the material granulometry, were quantitatively measured. The material flow into the knife mill and the grinder process were qualitatively evaluated. With a capability around 1 kg/h and a granulometry with 46,3% of the particules size around 2,01 to 4,00mm, and flow, and grind unsatisfactory, this process, in that way, was considerd inefficient in find a form of to grind flexible polyurethane foam, and it takes necessary, in industrial way, to solve a problem for reciclyng these kind of material.Keywords: Flexible polyurethane foam. Knife mill. Capability. Granulometry.

Novel flame retardant flexible polyurethane foam: plasma induced graft-polymerization of phosphonates

RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63853-63865 ◽  
Author(s):  
Maude Jimenez ◽  
Nicolas Lesaffre ◽  
Séverine Bellayer ◽  
Renaud Dupretz ◽  
Marianne Vandenbossche ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foam ◽  
Flame Retardancy ◽  
Graft Polymerization ◽  
Polyurethane Foams ◽  
Flexible Polyurethane Foam ◽  
Flexible Polyurethane

Flame retardancy of flexible polyurethane foams has become an issue due to very severe regulations.

Preparation and Characterization of Flexible Polyurethane Foams from Palm Oil-Based Polyol

2014 ◽  
Vol 911 ◽  
pp. 352-356 ◽  
Author(s):  
Duangphon Lumcharoen ◽  
Onusa Saravari
Keyword(s):  
Palm Oil ◽  
Polyurethane Foams ◽  
Toluene Diisocyanate ◽  
Indentation Hardness ◽  
Deflection Coefficient ◽  
Flexible Polyurethane ◽  
Polyether Polyol ◽  
Opposite Tendency ◽  
Pu Foams

Flexible polyurethane (PU) foams were prepared by replacing commercial petroleum-based polyether polyol with palm oil-based polyol up to 50 wt%. Palm oil was converted to polyol by transesterification reaction with glycerol using calcium oxide as a catalyst. PU foams were then prepared from reaction between mixtures of palm oil-based polyol and petrochemical polyols with toluene diisocyanate (TDI) using water as blowing agent. The morphology and physical-mechanical properties including apparent density, indentation hardness, compressive deflection coefficient or support factor, tensile strength, and tear strength of the prepared foams were characterized and compared to those of reference foam prepared using only conventional petrochemical polyols. Scanning electron microscopy (SEM) indicated that the cellular structures of all the prepared foams were semi-open and the cell size decreased with higher amount of palm oil-based polyol. The apparent densities and the compressive deflection coefficient of the PU foams increased with the increasing amount of palm oil-based polyol, while the indentation hardness showed the opposite tendency. Furthermore, the obtained foam modified with palm oil-based polyol of 20 wt% were found to have the highest tensile and tear strengths.

scholarly journals Numerical Studies of the Viscosity of Reacting Polyurethane Foam with Experimental Validation

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 105
Author(s):  
Kay Schäfer ◽  
Daisy Nestler ◽  
Jürgen Tröltzsch ◽  
Ikenna Ireka ◽  
Dariusz Niedziela ◽  
...  
Keyword(s):  
Polyurethane Foam ◽  
Raw Materials ◽  
Polyurethane Foams ◽  
Mathematical Framework ◽  
Physical Conditions ◽  
Transfer Processes ◽  
Linear Partial Differential Equations ◽  
Low Viscosity ◽  
Numerical Studies

Products made of polyurethane foam are manufactured by the chemical reaction of various low-viscosity raw materials and additives. The diversity of different formulations to meet the requirements of the market makes the characterization of their processing and flow properties important for a simple and error-free production. The modeling and simulation of such processes are equally of great importance. This provides additional findings without the expense of real tests and makes it easier to design components. The work described in this paper was carried out against this background. An experimental setup using a rheometer was developed to determine the flow and curing properties of reacting polyurethane foam reproducibly with comparable expansion conditions to industrial processes. The experiment was mathematically modelled to investigate the rheology of reacting polyurethane foams. The mathematical framework consists of coupled, non-linear, partial differential equations for the dynamics and the heat transfer processes in the system. These are solved numerically in 3D using finite volume techniques under adequate physical conditions. The accuracy of two viscosity laws according to the state of the art and their novel combination were investigated in this context. The proposed viscosity model of this study provides accurate results compared to the experiment.

Moisture Absorption and Shock Cushioning Behavior of Flexible Polyurethane Foam Filled with Saw Dust

2012 ◽  
Vol 626 ◽  
pp. 677-680 ◽  
Author(s):  
Syahidah M. Rum ◽  
Mohd Azlan ◽  
N.V. David
Keyword(s):  
Polyurethane Foam ◽  
Moisture Absorption ◽  
Polyurethane Foams ◽  
Second Law ◽  
Absorption Test ◽  
Saw Dust ◽  
Foam Filled ◽  
Diffusion Rates ◽  
Flexible Polyurethane Foam ◽  
Flexible Polyurethane

This paper presents the moisture absorption and shock cushioning properties of flexible polyurethane foams (PU) filled with saw dust fibers at 10, 15 and 20wt%. The compositeswere fabricated using open molded method from a two-part liquid foamsystem consisting of part-A (Isocyanate) and part-B (Polyol).The diffusion rates from the moisture absorption test is calculated using Ficks second law equation. Thesample with 10 wt% filler shows the highest diffusion ratewhile the lowest rateis sample with15wt% filler. The shock cushioning properties was determined via drop test where an 11.48-kg weight is dropped, from a height of 610 cm on the composites. The average Gvalue that represents product fragility was found to be 55.45.

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 OBTAINING FILLED POLYURETHANE FOAM WITH IMPROVED OPERATIONAL PROPERTIES

2019 ◽  
Vol 4 (4) ◽  
pp. 47-52
Author(s):  
А. Кочерженко ◽  
A. Kocherzhenko
Keyword(s):  
Polyurethane Foam ◽  
Raw Materials ◽  
Fusion Reaction ◽  
Mining Industry ◽  
Polyurethane Foams ◽  
Insulation Material ◽  
Good Adhesion ◽  
Foaming Process ◽  
Improved Performance ◽  
Selection Of

One of the most important advantages of polyurethane foam is the ability of single-stage production. Foaming and curing of this heat insulation does not require the supply of heat in connection with the exothermic fusion reaction that occurs when two or more liquid components are mixed, with simultaneous adhering of polyurethane foam to various surfaces due to good adhesion to almost any material. At the same time, this foam polymer has a low density and is able to withstand quite large loads. Thermal insulation material with improved performance properties can be obtained with a careful selection of the granulometric and chemical composition of raw materials. This paper presents a brief overview of the foaming and shaping of polyurethane, examines the structure of developed composite insulation, and establishes the dependence of the foaming ratio of polyurethane foam on the granulometric composition of fillers, including man-made (waste mining industry Stoylensky GOK). The research results show that in the process of forming filled polyurethane foams, chemical reactions between the components of the polyurethane foam and the elements of the fillers do not occur. The foaming process depends mainly on the granulometry of the filler and its percentage in the total mass of polyurethane foam.

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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