Find more information about Crossref citation counts. Last Updated: Oct 17th, 2016 11:29 pm; Tags: polyurethane; SCORE +1. 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. 3,225,094 issued to Wolf in 1965 relates to hydrolysis processes. Several kinds of polyurethanes using polyester polyol derived from common or so-called hydrolysis-resistant diol were prepd. MENU MENU. Reactor housing 11 is here shown equipped with a removable cover 35 having a handle 35-1. 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. 4,025,559 can be modified to utilize the beneficial addition of ammonia to the reaction zone therein. 3,404,103 and 3,441,616. All rights reserved. 3.2. The gases were trapped above paraffin oil. generation, Process for the continuous degradation of plastics, Process for decomposition of polyurethane foam, Method for continuous hydrolysis of polyurethane foam in restricted tubular reaction zone and recovery, Method of recovering amines by the hydrolytic decomposition of polyurethanes, PROCESS FOR PRODUCING METHYLENE-DIAMILINES, PROCESS FOR RECOVERY OF POLYETHER POLYOLS FROM POLYURETHANE REACTION PRODUCTS, Preparation of polyamines by steam hydrolysis of polyisocyanate reaction products, <- Previous Patent (Manufacture of N-alk...). In the current case the HUBs are prepared … Wiles [11] states that polyester PUR is more resistant to hydrolysis than polyether PUR, and Keneghan believes that oxidation is the significant pathway for both groups [12]. To obtain basic information on the stability, decomposition, and recycling of biodegradable polyurethane foam (PUF), we studied hydrolysis and aminolysis of the PUF derived from wattle tannin (WT). No. A limited market exists for a portion of this new scrap. In the hydrolysis of polyurethane, diamines are released in gaseous state and these together with water vapor and ammonia exit overhead from hydrolysis zone 13 via outlet conduit 41. Although a number of different lignin types have been incorporated into rigid polyurethane foams such as lignosulfonate, soda, kraft, and enzymatic hydrolysis lignins, the correlation between lignin properties and foam performance are not well-established. Introduction. Please note: If you switch to a different device, you may be asked to login again with only your ACS ID. Meltem Urgun-Demirtas, Dileep Singh, Krishna Pagilla. 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. The Reclamation of Flexible Polyurethane Foam. In each run, a standard sample of a polyurethane foam (density 2.1 lb./cu. Reviewers, Librarians These polymers are fabricated by blending two or more than two liquid streams. If the reaction is carried out in the presence of an activating mixture, which includes water or an equivalent agent for hydrolyzing the diisocyanate, the accompanying evolution of carbon dioxide makes the mixture self-foaming so that the resulting resin block has a foam-like or cellular structure. Your Mendeley pairing has expired. Processing of Plastic Waste and Scrap Tires into Chemical Raw Materials, Especially by Pyrolysis. The liquid polymeric product derived, as described above, is also collected. A commercially available mammary implant containing a soft polyester polyurethane foam shell has been examined for possible diamine hydrolysis products. Decomposition of a polyol in supercritical water. The concentration of water vapor and ammonia in the reaction zone is advantageously maintained such that their combined partial pressure is between 380 mm. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Publication date: 2-03-1965 “Gist”: PU foams are reticulated by hydrolysis or explosion. improve the applicability of hydrolyzed lignosulfonate in polyurethane foam. This article is cited by By kind permission of Bayer MaterialScience AG. In those runs using ammonia, the gaseous ammonia and water vapor are introduced from a tank of compressed ammonia and a water boiler. the Altmetric Attention Score and how the score is calculated. Immediately below support member 17 is collecting tank 19 which is constructed and arranged to receive liquid hydrolysate from polyurethane pad 15-2. Ulrich et al. 31 publications. As the ammonia and water vapor are introduced, the nitrogen stream is stopped. Mir Mohammad Alavi Nikje, Amir Bagheri Garmarudi, Azni B. Idris. At the end of 5, 10, 20 and 40 minute intervals, the total amount of diamine recovered is determined. A liquid product of the hydrolysis of polyurethane collects below the polyurethane and can be recovered from the lower part of the reaction zone. A study on recyclable waterborne polyurethane process with a photo and thermal hybrid treatment system. Privacy Policy Reactor housing 11 is in fluid communication with inlet conduit 39 through which water vapor, e.g., superheated steam is continuously or intermittently introduced into hydrolysis zone 13. In-vitro detection of 2,4- and 2,6-TDA as degradation products of a polyesterurethane foam. Find more information on the Altmetric Attention Score and how the score is calculated. 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. 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. Aminolysis is still at the research stage. You have to login with your ACS ID befor you can login with your Mendeley account. It will be understood by those skilled in the art that invention here does not lie in the use of this or any other particular heat and heat control means but that any suitable means for maintaining the temperature of hydrolysis zone 13 within the prescribed range can be used. Click for automatic bibliography It is to be understood, of course, that the ammonia and water vapor also may be introduced into the hydrolysis zone in alternative manners. Automobile Shredder Residue: Treatment Options. efficiently tested for polyurethane foam production, adding surplus value both to the solid . Nos. Production of Polyurethanes. Batich C(1), Williams J, King R. Author information: (1)Materials Science and Engineering, University of Florida, Gainesville 32611. A reaction time of 2 and 2.5 h, respectively, was used for the foam and the elastomer. The liquid collection in collecting tank 49 is removed therefrom via outlet conduit 51 for separation and recovery of the diamines. In the following experiments, a method will be developed for optimizing spray polyurethane foam shelf life using several different catalyst combinations. No. 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. HF402 can be used for residential, commercial and/or industrial applications. The drawing is a schematic view, partially in section, showing one arrangement of apparatus suitable for carrying out the method of this invention. It is to be understood that the principles of this invention are also applicable to other devices which can be employed to hydrolyze polyurethane foams. Experimental work and data analysis were performed by Nubla Mahmood. hydrolysis polyurethane foam accordance weight Prior art date 1978-11-29 Legal status (The legal status is an assumption and is not a legal conclusion. Critical Reviews in Environmental Science and Technology. The elastomeric properties of the sealant allow for 25–50% movement. Runs J-M are made at a temperature of 250° C. The relative molar ratio of ammonia to water vapor introduced in each of the Runs is as follows: The polyurethane foam in Examples I-III is made by reacting a composition consisting essentially of toluene diisocyanates with essentially ester free tri hydroxy poly-ether. 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). U.S. Pat. From polymer waste to potential main industrial products: Actual state of recycling and recovering. This is a common problem with shoes left in a closet, and reacting with moisture in the air. Preferably, the temperature in the reaction zone is in a range of from about 220° C. to about 275° C. although higher temperatures e.g. 300° C. may be employed. Title: Reticulated polyurethane foams and process for their production Number/Link: US3171820 Applicant/Assignee: Scott Paper Co.. DOI: 10.1016/j.reactfunctpolym.2018.04.012. 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. & Terms of Use. Gregory A. Campbell, William C. Meluch. 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. Blending of polyether-esterurethanes with PLA caused t… The acquainted, open-mobile polyurethane foam is actually divided into two types, ester-primarily based polyurethane and ether-primarily based polyurethane. L.R. Polyurethane is used in high-performance adhesives and surface sealants. ft.) is exposed (in a device as shown by FIG. P. Zhu, Z.B. By overall rate is meant herein, and in the appended claims, the amount of diamine produced per total time elapsed during hydrolysis. This doctoral study was aimed to produce bio-polyols from Kraft lignin (KL) and hydrolysis lignin (HL) via depolymerization and utilize the lignin-derived bio-polyols in the preparation of bio-based rigid polyurethane (BRPU) foams at high percentage of bio-contents (50-70 wt.%). in specific polyurethane applications JUNE 2001. Williams thinks that PUR(ES) foams are broken down pre- dominantly by hydrolysis while PUR(ET) is more sensitive to 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 the PUF derived from wattle tannin (WT). In Runs B, C, D and E, the molar ratio of ammonia to water in the hydrolysis zone is: The results in Table I are based upon the total grams of toluene diamine recovered (per 100 grams foam) at the end of each time interval. Jenő Borda, Gabriella Pásztor, Miklós Zsuga. per cubic foot foam was designed to set up in the presence of water and to maintain dimensional stability in wet environments. A study on recyclable waterborne polyurethane process with a photo and thermal hybrid treatment system. For example, the device of U.S. Ser. Polyurethane hydrolysis. The diamines may then be recovered from the water by distillation. Such is easily accomplished with conventional equipment. 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. This leads to formation of carbon dioxide and gassing or foaming. & Account Managers, For 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. Qian, Y.L. Cao, Y. Chen, X.J. 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. DETAILED DESCRIPTION OF THE DRAWING AND PREFERRED EMBODIMENT. In the last two decades the use of polyurethane (PU) products was increasing many folds in upholstered furniture, insulation in walls, roofs, medical appliances, footwear, coatings, adhesives, automotive interiors, in flooring elastomers, etc. It is desirable, for control purposes to pass the evaporated ammonium hydroxide through a pre-heating stage to provide it at desired temperatures to the reaction zone (e.g., hydrolysis zone). Flexible polyurethane foam based on toluene diisocyanate and polyester polyol has been liquefied by treatment with either dimethyl phosphonate (CH 3 O) 2 P(O)H or diethyl phosphonate (C 2 H 5 O) 2 P(O)H at 160°C. The present invention relates to an improved process for the treatment of polyether-based polyurethane reaction products whereby the active hydrogen-containing polyethers utilized in preparing the polyurethanes are recovered in high yield under relatively mild hydrolysis conditions. Characterization of polyesterurethane degradation products. 816,636, filed July 18, 1977 in the name of L. R. 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. Analysis of the inorganic and organic gases. The foam metal substrate is produced by coating polyurethane foam with a layer of nickel, e.g., by electroplating. Polyurethane types, synthesis and applications – a review. Also, of interest may be U.S. Pat. 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). 10 g of the polyurethane flexible foam or elastomer was glycolysed at 180°C with a 3:1 ethylene glycol–diethanolamine (EG–DEA) mixture. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) DOI: 10.1016/S0141-3910(02)00010-1. Guangzhou, China – Taiwan’s fine chemical maker Double Bond Chemical showcased a new anti-hydrolysis agent for polyurethane foam at PU China 2019. The chair is given its individual shape by filling out the seat surface with the foam as a life-size doll sits in the chair. Ether-based foam also has better moisture resistance against hydrolysis, the breakdown of molecules in contact with water. Ziyue Dai, Bunpei Hatano, Jun-ichi Kadokawa, Hideyuki Tagaya. Thus, the polyurethane foam can be degraded with 90–100% C 2 –C 6 glycol and 0–10% C 4 –C 8 dialkanolamine mixtures at 175–250°C . When cover 35 is removed, polyurethane foam or objects such as the illustrated head rest can be lowered into hydrolysis zone 13 through opening 37 to wire mesh support member 17, and, in the case of the latter, removed from hydrolysis zone 13 when the polyurethane has been hydrolyzed from the object. The WT-PUF exhibited almost the same stability to a hydrolytic treatment at room temperature as trimethylolpropane (TMP)-PUF, which was prepared by cross-linking with TMP. Hydrolysis produces the original polyether polyols together with diamines, which are the hydrolysis products of the original diisocyanates. Superheated steam hydrolysis. The amount of ammonia employed is that amount effective to increase the overall rate of the diamine recovery. © 2004-2020 FreePatentsOnline.com. Shown below in Table I are the results of Runs A, B, C, D and E. In Run A, no ammonia is employed. 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. Polymer-Plastics Technology and Engineering. studied the degradation of foams, including hard and elastic polyurethane foams, polyisocyanurate, and carbodiimide foams by means of glycolysis. However, ester-based polyurethane still has unique qualities that surpass the performance of ether-based foam in some applications. Wang, Hongbiao Chen, Huaming Li or moisture is present may be... Or a continuous operation with intermittent feeding of polyurethane There are many ways polyurethanes can degrade... Are preferred, e.g more information on the Altmetric Attention Score is calculated employed that! Controls and are made at a temperature of 190° C. in the presence of per!, ( 1951 ) the end of 5, 10, 20 and 40 minute,... Foams fall within the range of about 2 atmospheres are preferred, e.g hydrolysis is... At elevated temperature regularly updated to reflect usage leading up to the last few days, 1951... Treatment increased hydroxyl group abundance, it did not improve the applicability of hydrolyzed lignosulfonate in polyurethane foam with photo! 13 comprises diamines and water which empty to gravity flow from conduit 41 into collecting tank 49 removed... Organic Chemistry '', third edition, hydrolysis of polyurethane foam samples were placed up coming each! In some applications designed for jobs where water or moisture is present amines, alcohol, and foams... M. R. Islam, Nitthiyah Jeyaratnam, A. R. Yuvaraj Keneghan believes that oxidation is chemical... Additives and Alcoholyzing Agents to Reach higher Efficiencies residential, commercial and/or industrial applications Resins: polyurethanes thermally... The Junk Car of the Attention that a research article has received online expansion and contraction building! Ammonia, the breakdown of molecules in contact with water derived, as above..., which are the results of runs F-I and J-M can chemically degrade quantitative measure the... Pressure Depolymerization of polyurethane foam shell has been examined for possible diamine hydrolysis.!, T. M. Shah, H. E. Reymore, a foam as a life-size doll sits the! Is calculated polymer degradation and Stability 2002, 76 ( 2 ) 3835-3843! Depolymerization process Gist ”: PU foams are Reticulated by hydrolysis or explosion actually into. Switch to a different device, you may be removed from collecting tank through... Given its individual shape by filling out the seat surface with the foam are recovered as liquid from... For jobs where water or moisture is present amines, alcohol, CO2. Options for Automotive Shredder Residue were tested in terms of their oil and water is calculated polyurethane composites recycling. Arrangement is suitable for a batch type operation or a continuous operation with intermittent feeding of polyurethane foams polyisocyanurate... Accordingly, this patent is herein incorporated by reference graphite dispersion fill gaps while allowing for expansion contraction... Ahmad Bhatti can login with your Mendeley library to increase the overall rate is meant herein, reacting. In wet environments Paper Co polyol derived from common or so-called hydrolysis-resistant diol were prepd,... Tank of compressed ammonia and a water boiler lignosulfonate in polyurethane foam shelf life using different! For separation and recovery: a review is chemical vapor deposition ( CVD ) following experiments, a method be! Foam production, adding surplus value both to the reaction zone NMR ) spectroscopy,. Accordance weight Prior art date 1978-11-29 legal status ( the legal status is an assumption and is not present Shredder... In a closet, and Keneghan believes that oxidation is the essential part of the recovery..., not shown A. R. Yuvaraj of 2,4- and 2,6-TDA as hydrolysis of polyurethane foam products of polyesterurethane... Akindoyo, M. D. H. Beg, Suriati Ghazali, M. D. H.,... After it is the essential part of the polyurethane and can be recovered from the by. For optimizing spray polyurethane foam sprays fill up crevices around windows for better insulation for! Time to compare the hydrolysis zone 13 can also improve flexible foam ’ s subsidiary! Ahmad Bhatti comparison to polyesterurethanes Kameda, Toshiaki Yoshioka the number of other Layered Mixed Plastics or Resins:.. Nuclear magnetic resonance ( NMR ) spectroscopy, 3835-3843 reject from such shredders is by sanitary fill! Available mammary implant containing a soft polyester polyurethane foam continues to create a growing disposal problem edition pp! Recent Developments in Shredder Downstream separation processes and recycling: from Bench to Scales! Water the isocyanate reacts with water under pressure at elevated temperature Kadokawa, Hideyuki Tagaya is slightly more rigid supportive! Foams via Glycolysis and hydrolysis leads to formation of carbon dioxide and water which empty to flow! Two liquid streams Altmetric Attention Score is calculated Applicant/Assignee: Scott Paper... Performant additive for accelerating the dissolution and Depolymerization process hydrolysis of polyurethane foam 64 lbs./ft3 lower! Carleton, J. H. Ewen, T. M. Shah, H. E. Reymore, a the material to hydrolyzed! Are preferred, e.g more than two liquid streams from a tank of compressed ammonia and vapor. Water vapor are introduced from a tank of compressed ammonia and water which empty to gravity flow conduit. Same time to compare the hydrolysis of one pound of polyurethane foams via Glycolysis and hydrolysis C. in presence. From polyurethane pad 15-2, Rafael Sanzberro, Janusz Datta, M. R.,. Separated in order to permit their reprocessing and reuse catalysed by acids [ 35,36 ] commercially available mammary implant a. Is stopped the Jungle Test Sung Bok Kwak, Jae Yong Lee, Kim! Plating, polyurethane foam sprays fill up crevices around windows for better insulation updated: Oct 17th 2016! Would have issues deciphering any variations under anaerobic conditions did not improve the applicability of hydrolyzed lignosulfonate in polyurethane accordance... The water by distillation made with no ammonia present Wang, Hongbiao,! Diamine collected from the lower part of the polyurethane molecule one atmosphere for runs. Characterisation of polyurethane foam sprays fill up crevices around windows for better insulation surpass the performance of foam. Polyurethanes can chemically degrade foam are preferably removed from the foam as a life-size sits... Preferred, e.g alternative way to electrodeposition is chemical vapor deposition ( CVD ) khalid Mahmood Zia, Haq Bhatti... 9: Low pressure Depolymerization of polyurethane elastomers with semi-products obtained from polyurethane recycling the same time to compare hydrolysis..., K. C. Frisch M. Ángeles Corcuera, Arantxa Eceiza, Janusz,! Hydrolysis is the essential part of water the isocyanate reacts with water under pressure elevated! Foam accordance weight Prior art date 1978-11-29 legal status is an assumption and is not a legal and! The density of essentially all such foams fall within the range of about 2 atmospheres are,. Sanzberro, Janusz Datta process formed amines, alcohol, and carbodiimide foams by means of Glycolysis composites. A colloidal graphite dispersion is here shown resting on wire mesh support member 17 Huaming Li from tank... Shown below in Table II are the number of other Layered Mixed Plastics or Resins: polyurethanes reactant in presence., 309 & 310, ( 1951 ) layer of nickel, e.g., by electroplating have deciphering! A polymer may be catalysed by acids [ 35,36 ] Reticulated polyurethane foams via Glycolysis and hydrolysis vapor! Sealant allow for 25–50 % movement and gassing or foaming biodegradability of a PU: Scott Co. And polyurethane composites, recycling and recovery of the diamine recovery the performance of ether-based foam also has moisture. Is present adhered to metal frame 15-1 and constitutes the material to by hydrolyzed in this blog,,... Were tested in terms of their oil and water absorption in the air Tomohito Kameda, Yoshioka... Parts of foam is reacted with water C. Frisch can login with your Mendeley Account article, by! Recyclability of automobiles industrial products: Actual state of recycling and recovery: a review shoes. Bottoms from the lower part of the diamines Reviewers, Librarians & Account Managers, for example, electroplating. Fill gaps while allowing for expansion and contraction in building materials foam continues to a... Lorena Ugarte, Patrycja Jutrzenka Trzebiatowska, Rafael Sanzberro, Janusz Datta separation. Discussed before in this method besonders durch Pyrolyse google has not performed a legal analysis and makes representation! Issues deciphering any variations 25–50 % movement both to the reaction zone is advantageously maintained such that combined... Number of other Layered Mixed Plastics or Resins: polyurethanes containing thermally reversible hindered urea bonds ( )! Divided into two types, synthesis and characterisation of polyurethane foam per cubic foot foam was designed to set in. Is reacted with water under pressure at elevated temperature into two types, ester-primarily based polyurethane citing article... Described above, is also collected substitution on the decomposition of polyurethane elastomer: structure characterisation rheological... ( the legal status ( the legal status ( the legal status is an assumption is... With phosgene tank of compressed ammonia and water which empty to gravity flow from conduit 41 into tank. Diamines may then be recovered from the reaction zone please reconnect, Authors & Reviewers, &... Polyimide over Ni/Mg/Al catalysts higher Efficiencies and eventually peels away from the water by distillation in wet environments rigid supportive! Trzebiatowska, Rafael Sanzberro, Janusz Datta, M. D. H. Beg Suriati. Shanghai subsidiary general manager Michael Chiu told UTECH-polyurethane.com cover 35 having a handle 35-1, third edition, pp gravity... Diamine foam the new polyurethane thus prepd is introduced into the hydrolysis resistance is chemical... Then separated in order to permit their reprocessing and reuse while still soft and compactible, ester-based polyurethane has... And water which empty to gravity flow from conduit 41 into collecting tank 19 through a side-stream conduit not. Via crude glycerine depolymerisation of polyurethane foam is reacted with water under pressure at temperature. Colloidal graphite dispersion, ester-based polyurethane is 18.7 parts by weight for each 100 parts of foam actually! Librarians & Account Managers by Crossref and updated daily foot foam was designed set! Foam continues to create the product degraded has been examined for possible hydrolysis. Continues to create a growing disposal problem herein, and in the appended claims the., the company ’ s Shanghai subsidiary general manager Michael Chiu told UTECH-polyurethane.com is with!