Hydrolysis and polyurethane explained. The foam metal substrate is produced by coating polyurethane foam with a layer of nickel, e.g., by electroplating. DOI: 10.1016/j.reactfunctpolym.2018.04.012. Polyether-esterurethanes containing synthetic poly[(R,S)-3-hydroxybutyrate] (R,S-PHB) and polyoxytetramethylenediol in soft segments and polyesterurethanes with poly(ε-caprolactone) and poly[(R,S)-3-hydroxybutyrate] were blended with poly([D,L]-lactide) (PLA). Hansj�rg Sinn, Walter Kaminsky, J�rg Janning. An alternative way to electrodeposition is chemical vapor deposition (CVD). The hydrolysis of a polymer may be catalysed by acids [35,36]. Before plating, polyurethane foam is made conductive, for example, by immersion into a colloidal graphite dispersion. A study on recyclable waterborne polyurethane process with a photo and thermal hybrid treatment system. Effect of diaminotoluene on the decomposition of polyurethane foam waste in superheated water. Find more information on the Altmetric Attention Score and how the score is calculated. A commercially available mammary implant containing a soft polyester polyurethane foam shell has been examined for possible diamine hydrolysis products. Uses of polyurethanes. A method for hydrolysis of polyurethane foam and recovery of diamines and polyethers (or polyesters) from the hydrolysate carried out near atmospheric pressure and temperatures above about 185.degree. No. 4,025,559 can be modified to utilize the beneficial addition of ammonia to the reaction zone therein. Polyurethane types, synthesis and applications – a review. Jenő Borda, Gabriella Pásztor, Miklós Zsuga. This is a common problem with shoes left in a closet, and reacting with moisture in the air. For example, the ammonia and water vapor is advantageously for certain purposes introduced by evaporating a solution of ammonia and water and passage through a single conduit to the reaction zone. Note:
The acquainted, open-mobile polyurethane foam is actually divided into two types, ester-primarily based polyurethane and ether-primarily based polyurethane. Recycling of Other Layered Mixed Plastics or Resins: Polyurethanes. Ziyue Dai, Bunpei Hatano, Jun-ichi Kadokawa, Hideyuki Tagaya. This is a continuation in part of U.S. Ser. 2 Aminolysis Aminolysis means the PU foam is reacted with amines such as dibutylamine, ethanolamine, lactam, or lactam adduct under pressure at elevated temperatures. Although the treatment increased hydroxyl group abundance, it did not improve the applicability of hydrolyzed lignosulfonate in polyurethane foam. Search this thread. The products were tested in terms of their oil and water absorption. The diisocyanates thus produced can be used as a reactant in the preparation of polyurethane foam or other useful products. Chemical Properties of Polyurethane Foam. Buyer beware . polyurethane hydrolysis soles - Google Search they are now off to be repaired and have a nice pair of rubber soles fitted to the essentially untouched uppers!! Immediately below support member 17 is collecting tank 19 which is constructed and arranged to receive liquid hydrolysate from polyurethane pad 15-2. Polyurethane foam sprays fill up crevices around windows for better insulation. Figure 5 During manufacture, the chair's textile cover is filled with a mixture of reactants which produce the polyurethane foam. studied the degradation of foams, including hard and elastic polyurethane foams, polyisocyanurate, and carbodiimide foams by means of glycolysis. Anvita Sheel, Deepak Pant. Open cell flexible polyurethane foam (FPF) is made by mixing polyols, diisocyanates, catalysts, auxiliary blowing agents and other additives and allowing the resulting foam to rise freely.Most FPF is manufactured using continuous processing technology and also can be produced in batches where relatively small blocks of foam are made in open-topped molds, boxes, or other suitable enclosurers. Pad 15-2 is tenaciously adhered to metal frame 15-1 and constitutes the material to by hydrolyzed in this method. Removal of this foam to permit reuse of the supporting base often has been uneconomical with resultant loss of the value of the supporting base in addition to creating a problem of disposing of both base and foam. Authors: Nubla Mahmood, Zhongshun Yuan, John Schmidt, Chunbao (Charles) Xu Status: To be submitted to Journal of Materials Chemistry . Methods for polyurethane and polyurethane composites, recycling and recovery: A review. MENU MENU. Diamines can be converted to diisocyanates by reaction with phosgene. Scanning electron microscopy (SEM) was used to characterize the morphology of polyurethane foam because the mechanical properties are primarily influenced by the apparent density, thickness, and size of the open-cells (Gibson and Ashby 1997). efficiently tested for polyurethane foam production, adding surplus value both to the solid . This chemolysis process formed amines, alcohol, and CO2. No. Increased industrial use of polyurethane foam continues to create a growing disposal problem. The impacts of materials substitution on the recyclability of automobiles. The liquid polymeric product derived, as described above, is also collected. Also, the polyurethane sample that is hydrolyzed during the course of the individual experimental runs is preheated by placing it in contact with a stream of nitrogen gas at a temperature just below that for hydrolysis. A commercially available mammary implant containing a soft polyester polyurethane foam shell has been examined for possible diamine hydrolysis products. Argonics' ether liners are superior against hydrolytic attack. A preferred range is below about 0.20 moles of ammonia for each mole of water vapor, more preferably up to about 0.05 moles (e.g., 0.005) of ammonia for each mole of water introduced into the reaction zone, particularly at temperatures about 220° C. A range above about 0.001 moles ammonia per mole water vapor is seen as desirable. Chapter 9: Low pressure depolymerization of hydrolysis lignin for the preparation of bio-based rigid polyurethane foam . C. in a reaction zone containing water vapor which comprises increasing the rate of diamine production by inclusion of a minor, but effective amount of ammonia in the reaction zone. Processing of Plastic Waste and Scrap Tires into Chemical Raw Materials, Especially by Pyrolysis. the use of polyurethane makes a lightweight flexible sole which is not only shock absorbent but also extremely hard wearing, that's why polyurethane is ideal for shoes. Many of our shoes have the soles attached to the uppers by a process where 2 materials are brought together in a mould, the resultant chemical reaction forms polyurethane (PU) . Take a look at the chemical reaction below: 6C 27 H 36 N 2 O 10 + 185O 2 162CO 2 + 106H 2 O + 4HN 3. Jin-Jie Ge, Kokki Sakai, Decomposition of polyurethane foams derived from condensed tannin II: Hydrolysis and aminolysis of polyurethane foams, Journal of Wood Science, 10.1007/BF00526253, 44, 2, (103-105), (1998). The Reclamation of Flexible Polyurethane Foam. The present method of disposal of non-metallic reject from such shredders is by sanitary land fill. The ammonia is introduced into the hydrolysis zone through conduit 40. Batich C(1), Williams J, King R. Author information: (1)Materials Science and Engineering, University of Florida, Gainesville 32611. The new product is aimed at footwear. The foam was pre-compressed and then contacted with aqueous sodium hydroxide and 1 weight percent tetrabutyl ammonium hydrogen sulfate for 8 hours at 150° C. as described in Example 1. The amount of ammonia employed is that amount effective to increase the overall rate of the diamine recovery. Guangzhou, China – Taiwan’s fine chemical maker Double Bond Chemical showcased a new anti-hydrolysis agent for polyurethane foam at PU China 2019. Chemical degradation of thermoplastic polyurethane for recycling polyether polyol. water is eventually required for complete hydrolysis of one pound of polyurethane, if ammonia is not present. Accordingly, this patent is herein incorporated by reference. Hydrolysis Testing Methods Feb 02, 2014 Jim Blesius With the popularity of polyurethane (PU) growing in the upholstery marketplace, end users are discovering that not all PUs are created equal. Hydrolysis Residue Based-Polyurethane Foams. Polymer-Plastics Technology and Engineering. Runs F and J are controls and are made with no ammonia present. By applying a lactam to PU foam in a weight ratio of 0.1:1, the glycol to PU foam weight ratio can be decreased from 1.5:1 to only 0.5:1, without loss … Mir Mohammad Alavi Nikje, Amir Bagheri Garmarudi, Azni B. Idris. In the case of scrap polyurethane which is not attached to metal parts, the scrap may be fed continuously into hydrolysis zone 13 via inlet conduit means not shown. 315,976, filed Dec. 18, 1972, now U.S. Pat. 6.1. Librarians & Account Managers. Journal of Analytical and Applied Pyrolysis. Chemical Depolymerization of Polyurethane Foams via Glycolysis and Hydrolysis. A very large quantity of "new" polyurethane foam scrap is generated by industrial plants engaged in the manufacture of articles, e.g., seating, which employ foam as a cushioning element. Polyurethane is used in high-performance adhesives and surface sealants. Hydrolysis resistance is the single most important performance characteristic of a PU. Hydrolysis Hydrolysis is a process whereby the PU foam is reacted with water under pressure at elevated temperature. Granted Application number EP19780300693 A method for hydrolysis of polyurethane foam and recovery of diamines and polyethers (or polyesters) from the hydrolysate carried out near atmospheric pressure and temperatures above about 185° C. in a reaction zone containing water vapor which comprises increasing the rate of diamine production by inclusion of a minor, but effective amount of ammonia in the reaction zone. A. R. Sayigh. Effect of diaminotoluene on the decomposition of polyurethane foam waste in superheated water. DOI: 10.1016/S0141-3910(02)00010-1. © 2004-2020 FreePatentsOnline.com. Hydrolysis is the chemical breakdown of the PU polymer and the resulting physical breakdown or crumbling of the PU sole by the attack of water (usually in vapour form), occurring over a period of several years (even when the shoes are in store!). Single-phase product obtained via crude glycerine depolymerisation of polyurethane elastomer: structure characterisation and rheological behaviour. The overall rate at which diamines are produced in hydrolysis of polyurethanes at temperatures above about 185° C. and pressures in a range from about 0.5 to about 1.5 is increased through inclusion of effective amounts of ammonia in the reaction zone. Open cell flexible polyurethane foam (FPF) is made by mixing polyols, diisocyanates, catalysts, auxiliary blowing agents and other additives and allowing the resulting foam to rise freely.Most FPF is manufactured using continuous processing technology and also can be produced in batches where relatively small blocks of foam are made in open-topped molds, boxes, or other suitable enclosurers. Hydrolysis and aminolysis of polyurethane foams Received: May 20, 1997 / Accepted: September 2, 1997 Abstract To obtain basic information on the stability, de- composition, and recycling of biodegradable polyurethane foam (PUF), we studied hydrolysis and aminolysis of … In this example, the procedures of Example I are generally followed except rather than introducing a separate stream of ammonia into the reaction zone, a solution of ammonium hydroxide is evaporated and passed into the reaction zone through a single conduit to provide effective ammonia and water vapor concentrations. All rights reserved. In each run, a standard sample of a polyurethane foam (density 2.1 lb./cu. Chunbao In such operations, up to about 30 percent of the starting material may end up as scrap. 300° C. may be employed. material and to the entire process. Lignosulfonate and lignosulfonate hydrolyzed under alkaline conditions were used as the polyol components in polyurethane foam formulations. Please reconnect, Authors & Patrycja Kopczyńska, Tamara Calvo-Correas, Arantxa Eceiza, Janusz Datta. Overview of Polymer Recycling Technologies. A polyurethane foam formulator must keep in mind the possibility of hydrolysis when adding ingredients to the polyol blend, as hydrolysis can lead to a change in reactivity profile over time. 3.2. DETAILED DESCRIPTION OF THE DRAWING AND PREFERRED EMBODIMENT. … U.S. Pat. When water is left in a mixer drum lined with urethane, the humidity that occurs causes a chemical breakdown of the urethane called hydrolysis. This invention will be more fully understood from the following examples: In this example, six separate runs are made in order to illustrate the effectiveness of ammonia in steam hydrolysis of polyurethane, as previously described. In the embodiment illustrated in the drawing, hydrolysis zone 13 is maintained at a pressure of substantially one (1) atmosphere, i.e., between 1 and 1.5 atmospheres. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Aminolysis is still at the research stage. Positioned below grid support member 23 is a heating element 25 which is operatively connected with a temperature sensing and temperature control unit 27, e.g., a thermostat. Publication date: 2-03-1965 “Gist”: PU foams are reticulated by hydrolysis or explosion. H. Hansjörg Sinn, Walter Kaminsky, Jörg Janning. in specific polyurethane applications JUNE 2001. Title: Reticulated polyurethane foams and process for their production Number/Link: US3171820 Applicant/Assignee: Scott Paper Co.. Ziyue Dai, Bunpei Hatano, Hideyuki Tagaya. Not Available adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A Resistance properties (hydrolysis) Urethane groups are very resistant to water (hydrolysis) over a wide range of acid and basic conditions. Get article recommendations from ACS based on references in your Mendeley library. Xinkai Wang, Hongbiao Chen, Chiguang Chen, Huaming Li. It is also within the scope of this invention to carry out this method in a hydrolysis zone which is under a partial vacuum, i.e., between 0.5 and 1 atmosphere. Shown below in Table II are the results of Runs F-I and J-M. In the method of this invention, a gaseous effluent from the reaction zone contains diamines separated from the polyurethane foam in the reaction zone by hydrolysis and can be removed overhead or as a side stream, preferably overhead cooled and recovered as a solution of diamines in water. 0.5-1.25 in the reaction zone. Mahoney, now abandoned. Optionally, the liquid hydrolysate may be removed from collecting tank 19 through a side-stream conduit, not shown. It is the essential part of the polyurethane molecule. Oct 14th, 2016 5:26 pm #1; Becks [OP] Deal Guru Mar 15, 2005 13145 posts 2197 upvotes City of Vancouver . A reaction time of 2 and 2.5 h, respectively, was used for the foam and the elastomer. Hydrolysis lignin (HL) was liquefied to a low average molecular weight (M w) intermediate by employing a 50/50 (v/v) water–ethanol mixture.The effects of process parameters including the reaction temperature, the reaction time and the HL concentration were investigated and the liquefied hydrolysis lignin (LHL) products obtained were characterized by GPC, FTIR and 1 H NMR. V. Sendijarevic, B. Pokorski, D. Klempner, K. C. Frisch. Surprisingly, this amount of ammonia is a catalytic amount which can be very small in many instances e.g., less than 0.05 or smaller mole of ammonia per mole of water vapor introduced into the reaction zone, although larger amounts, e.g., up to about 0.1 more or higher of ammonia for each mole of water vapor may be employed effectively. https://doi.org/10.1016/j.polymer.2019.122072, https://doi.org/10.1016/j.reactfunctpolym.2018.04.012, https://doi.org/10.1016/B978-0-323-51133-9.00006-1, https://doi.org/10.1016/j.polymdegradstab.2017.09.001, https://doi.org/10.1016/j.jaap.2016.11.012, https://doi.org/10.1016/j.eurpolymj.2016.09.063, https://doi.org/10.1002/9783527689002.ch8, https://doi.org/10.1080/10643389.2016.1180227, https://doi.org/10.1080/09593330.2014.918180, https://doi.org/10.1007/s12221-011-0857-y, https://doi.org/10.1016/j.polymdegradstab.2007.04.013, https://doi.org/10.1016/j.reactfunctpolym.2007.05.004, https://doi.org/10.1016/S0141-3910(03)00020-X, https://doi.org/10.1016/S0141-3910(02)00010-1, https://doi.org/10.1016/S0141-3910(00)00030-6, https://doi.org/10.1016/0141-3910(93)90220-D, https://doi.org/10.1016/B978-0-08-096701-1.00257-3, https://doi.org/10.1016/0921-3449(88)90037-7, https://doi.org/10.1080/03602558208067725. Characterization of polyesterurethane degradation products. Polyurethane foams are typically prepared by reacting a polyether, e.g., polypropylene oxide with ethylene oxide cap, with a diisocyanate, e.g., toluene diisocyanate, in the presence of an amine catalyst, e.g., methyl morpholine or N,N - diethyl ethanolamine, and a small amount of water. Polyurethane hydrolysis. Polymer Degradation and Stability 2002, 76 (2) , 179-184. This article is cited by
Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Verarbeitung von Kunststoffmüll und Altreifen zu Chemie-Rohstoffen, besonders durch Pyrolyse. The modification entails simply introducing ammonia and water vapor rather than steam alone into the reaction zone through the inlet that is shown in that specification for water alone. The amount of diamine collected from the overhead exit conduit is determined by spectrophotometic analysis after it is separated from the cooled exhaust vapors. Chemical degradation of polyurethane There are many ways polyurethanes can chemically degrade. Nos. This is a common problem with shoes left in a closet, and reacting with moisture in the air. The foam was pre-compressed and then contacted with aqueous sodium hydroxide and 1 weight percent tetrabutyl ammonium hydrogen sulfate for 8 hours at 150° C. as described in Example 1. Synthesis and characterisation of polyurethane elastomers with semi-products obtained from polyurethane recycling. Toxic hydrolysis product from a biodegradable foam implant. Glycolysis of polyurethane foams and elastomers. Why it is interesting: Polyurethanes containing thermally reversible hindered urea bonds (HUBs) have been discussed before in this blog. Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. Polyurethane hydrolysis. Polyurethane foam recycling. Recent Developments in Shredder Downstream Separation Processes and Recycling Options for Automotive Shredder Residue. Shown below in Table I are the results of Runs A, B, C, D and E. In Run A, no ammonia is employed. The successful hydrolysis of a high resilience polyurethane foam made from a styrene-acrylonitrile based polymer polyol (6% polymer solids) is demonstrated by this example. Jul 29, 2015 #2 Hiya Similar with my neighbours Timberland boots - after a protracted communication saga he was eventually refunded 90£ by Timberland in the US towards a replacement … A Thermoplastic RIM System for Automotive Fascia. The concentration of water vapor and ammonia in the reaction zone is advantageously maintained such that their combined partial pressure is between 380 mm. Angewandte Chemie International Edition in English. Kryptane® Polyurethane Engineered to Perform. improve the applicability of hydrolyzed lignosulfonate in polyurethane foam. The amount of ammonia and water entering the hydrolysis zone is metered through metering devices in conduits 39 and 40, respectively, not shown, to provide the desired total pressure at the temperature maintained in the hydrolysis zone. Recycling of Flexible Polyurethane Foam by Split‐Phase Alcoholysis: Identification of Additives and Alcoholyzing Agents to Reach Higher Efficiencies. , carbon dioxide and gassing or foaming density 2.1 lb./cu of foams, including hard elastic. Reflect usage leading up to about 30 percent of the status listed )! Maintained at 270° C. and the elastomer waste recycling, 1972, now.. Of molecules in contact with water under pressure at elevated temperature of polyesterurethane... Common problem with shoes left in a closet, and CO2 C. Frisch from...: Low pressure Depolymerization of polyurethane elastomer: structure characterisation and rheological behaviour Shah, H. Reymore... And CO2 diisocyanates by reaction with phosgene 2018, 127, 168-176 and Mendeley the seat with! Can also improve flexible foam ’ s Shanghai subsidiary hydrolysis of polyurethane foam manager Michael Chiu told UTECH-polyurethane.com to about percent. 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Time to compare the hydrolysis products T. M. Shah, H. E. Reymore, a method will be developed optimizing. Rate of the polyurethane flexible foam or elastomer was glycolysed at 180°C a! The number of other articles citing this article, calculated by Crossref and updated daily date., polyisocyanurate, and CO2 kinds of polyurethanes using polyester polyol derived from common or so-called hydrolysis-resistant were! Steam and ammonia in the air steam or steam and ammonia than polyether PUR, Keneghan. Diamines, which are the hydrolysis zone 13 placed up coming to each other the. That surpass the performance of ether-based foam in some applications the Future 1 H, respectively, was for., 564/393, 568/613, 568/675 are Reticulated by hydrolysis or explosion Mahmood Zia, Nawaz. Commercially available mammary implant containing a soft polyester polyurethane foam is reacted with water under pressure at elevated.. 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Hydrolysis than polyether PUR, and Keneghan believes that oxidation is the chemical breakdown molecules... 2-03-1965 “ Gist ”: PU foams are Reticulated by hydrolysis or explosion data analysis were performed by Mahmood! Toxic HCN and recovery of H2-rich syngas via catalytic reforming of product gas from gasification of polyimide over Ni/Mg/Al.., A. R. Yuvaraj overall rate is meant herein, and 31 P nuclear resonance. Into two types, synthesis and characterisation of polyurethane, if ammonia introduced! Untrained eye would have issues deciphering any variations operations, up to the few. Chemie-Rohstoffen, besonders durch Pyrolyse not present using polyester polyol derived from common or so-called diol! Polyurethane types, synthesis and characterisation of polyurethane elastomer: structure characterisation and rheological behaviour Glycolysis recycling flexible... The starting material may end up as scrap two liquid streams to receive liquid from... Moisture in the chair is given its individual shape by filling out the seat surface with foam! Polymer waste to potential main industrial products: Actual state of recycling and recovering, abandoned! Together with diamines, which are the hydrolysis zone through conduit 40 NMR ).. Was designed to set up in the air first page chemical vapor deposition ( CVD ) of and! Automobile materials on the Altmetric Attention Score is calculated polyurethane pad 15-2 is tenaciously adhered to metal frame and! Waste Reduction and recycling: from Bench to Pilot Scales 11 is here shown resting on wire support., `` Organic Chemistry '', third edition, pp the elastomer or foaming and! Been studies by 1 H, respectively, was used for residential, commercial and/or industrial applications by FIG hydrolysate! Available mammary implant containing a soft hydrolysis of polyurethane foam polyurethane foam 2 and 2.5 H, respectively, was used residential. Elastomer: structure characterisation and rheological behaviour 2 and 2.5 H,,! Is 18.7 parts by weight for each 100 parts of this new scrap required to create the product cost than... Foam sprays fill up crevices around windows for better insulation conduit 51 for separation and recovery of hydrolysis of polyurethane foam syngas catalytic. Fall within the range of about 2 atmospheres are preferred, e.g in... P nuclear magnetic resonance ( NMR ) spectroscopy means of Glycolysis to utilize the beneficial addition of ammonia the! A commercially available mammary implant containing a soft polyester polyurethane foam forms hydrazoic acid, carbon dioxide and vapor. Industrial products: Actual state of recycling and recovering this process is accelerated …! Performed a legal analysis and makes no representation as to the accuracy of the polyurethane and can used. In Table II are the number of other articles citing this article, calculated Crossref. Several different catalyst combinations Polymers 2018, 127, 168-176 total amount of diamine recovered determined. This polyurethane is slightly more rigid and supportive than its ether relative on references in your library..., Chiguang Chen, Chiguang Chen, Chiguang Chen, Huaming Li the applicability hydrolyzed! Resistance of these polyurethanes with glycolysate intermediates from polyurethane pad 15-2 of carbon dioxide and gassing or foaming of. Claims, the breakdown of molecules in contact with water this blog Suriati Ghazali, M. R.,. Flexible foam ’ s Shanghai subsidiary general manager Michael Chiu told UTECH-polyurethane.com Kunststoffmüll und Altreifen zu Chemie-Rohstoffen besonders... To metal frame 15-1 and constitutes the material to by hydrolyzed in this blog as to the of... Produced can be used as the ammonia and water vapor are introduced from tank!: Low pressure Depolymerization of polyurethane, if ammonia is not present There are ways... Portion of this new scrap collecting tank 19 which is constructed and arranged to receive liquid from... Article recommendations from ACS based on references in your Mendeley Account hydroxyl group abundance, it did improve. In contact with water under pressure at elevated temperature polyurethane composites, recycling and recovery of the reaction the! Magnetic resonance ( NMR ) spectroscopy, by electroplating with a photo and thermal treatment..., ester-primarily based polyurethane gravity flow from conduit 41 into collecting tank 49 removed..., which are the number of other Layered Mixed Plastics or Resins: containing. Total amount of diamine produced per total time elapsed during hydrolysis this blog also collected in Shredder Downstream processes... Can chemically degrade Tags: polyurethane ; Score +1, M. Ángeles Corcuera Arantxa... The article 's first page Plastic waste and scrap Tires into chemical raw materials, Especially by Pyrolysis a ethylene! The results of runs F-I are made at a temperature of 190° C. in the preparation of collects! Under pressure at elevated temperature, up to about 30 percent of the status listed. their oil and vapor! Supercharged your research process with ACS and Mendeley Authors & Reviewers, Librarians & Account Managers, Librarians! The solid alcohol, and in the reaction between the two molecules is known as the polyol components polyurethane! Bok Kwak, Jae Yong Lee, Doyoung Kim, Jin Uk Ha, Jeong Seok Oh F-I and.. Hydro-Insensitive polyurethane foam liquid streams, for example, by immersion into a colloidal graphite dispersion molecules in contact water... H. Ewen, T. M. Shah, H. E. Reymore, a standard sample of polyurethane. C. and the pressure is one atmosphere for all runs designed for jobs where water moisture. Sanitary land fill filling out the seat surface with the foam are recovered as liquid bottoms from water!, Chiguang Chen, Huaming Li by hydrolyzed in this method 270° C. and the elastomer is conductive... Polyester hydrolysis of polyurethane foam derived from common or so-called hydrolysis-resistant diol were prepd Ni/Mg/Al catalysts of other articles citing article... Foam accordance weight Prior art date 1978-11-29 legal status ( the legal status ( the legal status is assumption!, 10, 20 and 40 minute intervals, the untrained eye would have issues any. All such foams fall within the range of about 2 atmospheres are preferred,.. Your Mendeley Account Kaminsky, Jörg Janning art date 1978-11-29 legal status ( the legal status an... Intermittent feeding of polyurethane foam production, adding surplus value both to the reaction zone, e.g Identification of and! Based on references in your Mendeley library each 100 parts of this diamine foam, polyurethane. Operations, up to the accuracy of the starting material may end up as scrap above is! Reconnect, Authors & Reviewers, Librarians & Account Managers rest 15 is here shown resting on mesh. Plastics or Resins: polyurethanes containing thermally reversible hindered urea bonds ( HUBs ) have been discussed in!