scholarly journals Improving the Hydrophilicity of Flexible Polyurethane Foams with Sodium Acrylate Polymer

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2197
Author(s):  
Ana M. Borreguero ◽  
Javier Zamora ◽  
Ignacio Garrido ◽  
Manuel Carmona ◽  
Juan F. Rodríguez
Keyword(s):  
Negative Impact ◽  
Absorption Capacity ◽  
Polyurethane Foams ◽  
Sodium Acrylate ◽  
Cell Size Distribution ◽  
Foam Properties ◽  
Homogeneous Cell ◽  
Flexible Polyurethane ◽  
Saline Solutions ◽  
Acrylate Polymer

Hydrophilic, flexible polyurethane (FPU) foams made from Hypol prepolymers are capable of retaining large amounts of water and saline solutions. The addition of different catalysts and surfactant agents to Hypol JM 5008 prepolymer was assayed to obtain a foam with good structural stability and elasticity. The combination of three catalysts, stannous octoate and two amine-based ones (Tegoamin 33 and Tegoamin BDE), and the surfactant Niax silicone L-620LV allowed to synthesize a foam with a homogeneous cell size distribution, exhibiting the highest saline absorption capacity (2.4 g/gram of foam) and almost complete shape recovery, with up to a 20% of remaining deformation. Then, superabsorbent sodium acrylate polymer (PNaA) was added to the FPU foam up to 8 pph. The urine absorption capacity of the foam was increased about 24.8% by incorporating 6 pph of PNaA, absorbing 17.46 g of saline solution per foam gram, without any negative impact on the rest of the foam properties. All these properties make the synthesized foams suitable for corporal fluids absorption applications in which elasticity and low-density are required.

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 Preparing and Improving the Properties of Sodium Acrylate Polymer by Adding Dentonite for the Treatment of Desertification Phenomenon

2019 ◽  
Vol 3 (1) ◽  
pp. 15-29
Author(s):  
Hamid Al-Falahi ◽  
Estabraq Hameed
Keyword(s):  
High Temperature ◽  
Water Absorption ◽  
National Economy ◽  
Agricultural Land ◽  
Negative Impact ◽  
Sodium Acrylate ◽  
Sodium Polyacrylate ◽  
Chemical Methods ◽  
The Cross ◽  
Acrylate Polymer

ABSTRACT The phenomenon of desertification has a negative impact on the national economy of any country and may usually be obtained for many reasons such as the removal of agricultural land, depletion of soil, overgrazing, methods of poor irrigation, high temperature, and the lack of rainfall. The following paper tackles solving the problem of the lack of rainfall through the use of chemical methods such as preparing sodium polyacrylate and improving its properties by means of adding bentonite and thus obtaining a new and improved water absorption compound. The study concludes that the suitable range of bentonite ratio that is between (0 - 20 wt %) ensures water absorption from 1340 gg - 1 to 1500gg – 1 and thus the researcher confirms that the cross-linked of the compound will not be changed and the absorption of water will be higher. The presence of bentonite with polymer at a perfect percentage contributes to the reorganization of the distribution of the granular size of the polymer sodium polyacrylate—a matter that is reflected on the growing of its ability to absorb water and thus becoming a suitable compound in the treatment of desertification.

In situ monitoring of isophorone diisocyanate-based flexible polyurethane foams formation

2016 ◽  
Vol 54 (1) ◽  
pp. 37-52 ◽  
Author(s):  
I Eceiza ◽  
L Irusta ◽  
A Barrio ◽  
MJ Fernández-Berridi
Keyword(s):  
Foam Height ◽  
Polyurethane Foams ◽  
In Situ Monitoring ◽  
Generation Process ◽  
Isophorone Diisocyanate ◽  
Experimental Conditions ◽  
Foaming Process ◽  
Foam Generation ◽  
Flexible Polyurethane

Novel isophorone diisocyanate-based flexible polyurethane foams were prepared by the one-step method in a computerized foam qualification system (FOAMAT). The experimental conditions to obtain this type of foams, in relation to the nature and concentration of catalysts as well as the reaction temperature, were established as no data were available in scientific literature. The chemical reactions occurring during the foam generation process were monitored in situ by attenuated total reflectance-FTIR spectroscopy. The kinetics of the foam generation was fitted to an nth order model and the data showed that the foaming process adjusted to a first-order kinetics. The physical changes as pressure, foam height, and dielectric polarization were monitored by the FOAM software (FOAMAT). According to these parameters, the foaming process was divided into four steps: bubble growth, bubble packing, cell opening, and final curing.

Polymers and Environment I. Biodegradability of Flexible Polyurethane Foams.

1993 ◽  
Vol 50 (10) ◽  
pp. 731-738 ◽  
Author(s):  
Noriyuki MOROHOSHI ◽  
Chun-Chieh HONG ◽  
Miyako MORIMOTO ◽  
Takashi OOHASHI ◽  
Hiroyuki MATUMOTO
Keyword(s):  
Polyurethane Foams ◽  
Flexible Polyurethane

Flexible Polyurethane Foams

2004 ◽  
Author(s):  
Bicerano ◽  
R Daussin ◽  
M Elwell ◽  
van der Wal ◽  
Berthevas ◽  
...  
Keyword(s):  
Polyurethane Foams ◽  
Flexible Polyurethane
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