JP2010053055A - Method for decomposing hexamethylene diisocyanate-based polyurea compound - Google Patents

Method for decomposing hexamethylene diisocyanate-based polyurea compound Download PDF

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JP2010053055A
JP2010053055A JP2008218165A JP2008218165A JP2010053055A JP 2010053055 A JP2010053055 A JP 2010053055A JP 2008218165 A JP2008218165 A JP 2008218165A JP 2008218165 A JP2008218165 A JP 2008218165A JP 2010053055 A JP2010053055 A JP 2010053055A
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hdi
polyurea compound
decomposing
hexamethylene diisocyanate
decomposition
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Mutsuhisa Furukawa
睦久 古川
Ken Koshiio
謙 小椎尾
Suguru Motokucho
卓 本九町
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Nippon Polyurethane Industry Co Ltd
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Priority to PCT/JP2009/004174 priority patent/WO2010023922A1/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
    • C07C209/62—Preparation of compounds containing amino groups bound to a carbon skeleton by cleaving carbon-to-nitrogen, sulfur-to-nitrogen, or phosphorus-to-nitrogen bonds, e.g. hydrolysis of amides, N-dealkylation of amines or quaternary ammonium compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/302—Water
    • C08G18/305—Water creating amino end groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • C08J11/14—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with steam or water
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/02—Polyureas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for decomposing a hexamethylene diisocyanate (HDI)-based polyurea, which recovers reusable hexamethylenediamine (HDA) and does not cause a problem of corrosiveness of reactor without adding a hydrolysis promoter such as an alkali, etc., to a urea residue generated as a by-product in the production of HDI which has only been treated hitherto as waste. <P>SOLUTION: The method for decomposing an HDI-based polyurea compound includes hydrolyzing the HDI-based polyurea compound in carbon dioxide in a supercritical state or subcritical state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、ヘキサメチレンジイソシアネート（以後、ＨＤＩと略称する）系ポリウレア化合物を加水分解してヘキサメチレンジアミン（以後、ＨＤＡと略称する）を回収する、ＨＤＩ系ポリウレア化合物の分解処理方法に関する。   The present invention relates to a method for decomposing a HDI polyurea compound, wherein a hexamethylene diisocyanate (hereinafter abbreviated as HDI) polyurea compound is hydrolyzed to recover hexamethylenediamine (hereinafter abbreviated as HDA).

ポリウレタンは、ポリイソシアネートとポリオールとの重付加反応により合成される高分子材料である。ポリウレタンは、配合、処方、成形方法等により、種々の物性を付与することが可能である。このため、フォーム、エラストマー、塗料、接着剤等多種多様に利用されている。   Polyurethane is a polymer material synthesized by polyaddition reaction of polyisocyanate and polyol. Polyurethane can be imparted with various physical properties by blending, formulation, molding method and the like. For this reason, it is used in a wide variety of forms such as foams, elastomers, paints, and adhesives.

ポリウレタンの原料であるイソシアネートは、対応するアミンをホスゲンと反応させることにより得られているが、この際の副生成物として、ポリウレア化合物を含有する残さが生成する。この残さは、常温下で固化するタール状の物質であり、ハンドリングが難しいため、従来はもっぱら焼却処理される廃棄物であった。   Isocyanate, which is a raw material of polyurethane, is obtained by reacting a corresponding amine with phosgene, and a residue containing a polyurea compound is produced as a by-product at this time. This residue is a tar-like substance that solidifies at room temperature and is difficult to handle, so that it has conventionally been a waste that is exclusively incinerated.

この残さを分解・回収する方法として、超臨界状態又は亜臨界状態の水を用いてウレア残さを処理する方法が特許文献１に提案されている。   As a method for decomposing / recovering the residue, Patent Document 1 proposes a method of treating urea residue using supercritical or subcritical water.

特開２０００−１３６２６４号公報JP 2000-136264 A

しかしながら、特許文献１の方法では、超臨界状態又は亜臨界状態の水とするためには、高温（臨界温度＝３７４℃）・高圧（臨界圧力＝２２．１ＭＰａ）のという過酷な条件が必要であるため、重厚な設備を必要とする。また超臨界状態又は亜臨界状態の水は、金属腐食の問題を内包しており、反応容器他の装置の維持管理が煩雑となる。   However, the method of Patent Document 1 requires harsh conditions such as high temperature (critical temperature = 374 ° C.) and high pressure (critical pressure = 22.1 MPa) in order to obtain supercritical or subcritical water. Therefore, heavy equipment is required. Further, water in a supercritical state or a subcritical state contains a problem of metal corrosion, and the maintenance of the reaction vessel and other devices becomes complicated.

本発明の目的は、これまで廃棄処分するしかなかったＨＤＩ製造時に副生するポリウレア化合物を含有する残さに、アルカリ等の加水分解促進剤を添加することなく、再利用可能なアミン化合物を回収でき、また、反応装置の腐食性の問題を起こすことのないＨＤＩ系ポリウレア化合物の分解処理方法を提供することにある。   An object of the present invention is to recover a reusable amine compound without adding a hydrolysis accelerator such as an alkali to the residue containing a polyurea compound by-produced during the production of HDI, which has been only discarded. Another object of the present invention is to provide a method for decomposing an HDI polyurea compound that does not cause the corrosive problem of the reactor.

そこで本発明者らは上記課題を解決するべく鋭意検討した結果、ＨＤＩ系ポリウレア化合物を、超臨界状態又は亜臨界状態の二酸化炭素中にて、加水分解させることにより、ＨＤＡの効率的な回収、及びそのための好適条件を見い出し、本発明を完成するに至った。すなわち本発明は、以下の（１）〜（４）に示されるものである。   Therefore, as a result of intensive studies to solve the above-mentioned problems, the present inventors have conducted an efficient recovery of HDA by hydrolyzing an HDI-based polyurea compound in carbon dioxide in a supercritical state or a subcritical state. And the suitable conditions for it were found, and it came to complete this invention. That is, this invention is shown by the following (1)-(4).

（１）ＨＤＩ系ポリウレア化合物を超臨界状態又は亜臨界状態の二酸化炭素中で加水分解して、ＨＤＡを回収することを特徴とする、ＨＤＩ系ポリウレア化合物の分解処理方法。 (1) A method for decomposing an HDI polyurea compound, comprising hydrolyzing an HDI polyurea compound in carbon dioxide in a supercritical state or a subcritical state to recover HDA.

（２）加水分解時の圧力が３ＭＰａ以上であることを特徴とする、前記（１）のＨＤＩ系ポリウレア化合物の分解処理方法。 (2) The method for decomposing an HDI polyurea compound according to (1) above, wherein the pressure during hydrolysis is 3 MPa or more.

（３）加水分解時の温度が１８０℃以上であることを特徴とする、前記（１）、（２）のＨＤＩ系ウレア化合物の分解処理方法。 (3) The method for decomposing an HDI urea compound according to (1) or (2) above, wherein the hydrolysis temperature is 180 ° C. or higher.

（４）ＨＤＩ系ポリウレア化合物の質量に対して、水の質量が２０倍〜１２０倍であることを特徴とする、前記（１）〜（３）のいずれかのＨＤＩ系ポリウレア化合物の分解処理方法。 (4) The method for decomposing an HDI polyurea compound according to any one of (1) to (3), wherein the mass of water is 20 to 120 times the mass of the HDI polyurea compound .

本発明において、ＨＤＩ系ポリウレア化合物とは、主に−ＮＨ−ＣＯ−ＮＨ−なる基（ウレア基）と−（ＣＨ2）6−が隣接する化合物であり、前記ウレア基の一部がビウレット基となっているものも含む。具体的には、主にＨＤＩ製造時に副生する残さとして生成するものである。また残さとは、ＨＤＩ製造時に発生する残さを意味する。 In the present invention, the HDI-based polyurea compound is a compound in which a group (urea group) of —NH—CO—NH— is mainly adjacent to — (CH 2 ) 6 —, and a part of the urea group is a biuret group. Also included are Specifically, it is generated mainly as a by-product residue during HDI production. The residue means a residue generated at the time of manufacturing the HDI.

本発明の分解に用いられるＨＤＩ系ポリウレア化合物としてはＨＤＩ製造時に副生する残さであればいずれの工程で発生したものでもよい。具体的には、ＨＤＡ製造工程、ＨＤＡとホスゲンの反応工程、ＨＤＩ精製工程等のいずれかで副生する残さである。これら残さは各工程においては溶融、溶解していてもよい。なお本発明に適用できる残さとしてはホスゲンを用いて製造されるＨＤＩには限定されず、非ホスゲン法で製造する場合それらの各工程のいずれかの工程で副生する残さをも分解することができることは言うまでもない。   The HDI-based polyurea compound used in the decomposition of the present invention may be generated in any step as long as it remains as a by-product during HDI production. Specifically, it is a residue by-produced in any of the HDA production process, the HDA-phosgene reaction process, the HDI purification process, and the like. These residues may be melted and dissolved in each step. The residue applicable to the present invention is not limited to HDI produced using phosgene, and when produced by a non-phosgene method, the residue produced as a by-product in any of these steps may be decomposed. It goes without saying that we can do it.

残さとしてはいずれを用いても良いが通常、各工程で発生した残さを固液分離工程、蒸留工程等により液状成分と分離した後に用いられる。   Any residue may be used, but it is usually used after the residue generated in each step is separated from the liquid component by a solid-liquid separation step, a distillation step or the like.

これらＨＤＩ製造時に副生する残さは主としてアミン、イソシアネート等の熱重縮合物からなる混合物である。熱重縮合物は例えばウレア（ウレタン）、ビウレット、カルボジイミド、イソシアヌレート等の基又は環を有している。特にこれらの基又は環を複数有する複雑な構造を有する化合物が多く含有されている。   The residue produced as a by-product during the production of HDI is a mixture mainly composed of thermal polycondensates such as amines and isocyanates. The thermal polycondensate has groups or rings such as urea (urethane), biuret, carbodiimide, isocyanurate and the like. In particular, many compounds having a complicated structure having a plurality of these groups or rings are contained.

上記の残さ中に含有するＨＤＩ系ポリウレア化合物は、超臨界又は亜臨界状態の二酸化炭素中で、ＨＤＡに加水分解される。加水分解時の圧力は、分解効率の点から３ＭＰａ以上であることが好ましく、特に４．８ＭＰａ以上が特に好ましい。   The HDI polyurea compound contained in the residue is hydrolyzed to HDA in carbon dioxide in a supercritical or subcritical state. The pressure during hydrolysis is preferably 3 MPa or more, particularly preferably 4.8 MPa or more from the viewpoint of decomposition efficiency.

分解温度は１８０℃以上が好ましく、特に１８５℃以上が好ましい。温度が低い場合は分解速度が遅くなる。   The decomposition temperature is preferably 180 ° C. or higher, and particularly preferably 185 ° C. or higher. When the temperature is low, the decomposition rate becomes slow.

ＨＤＩ系ポリウレア化合物と水の割合は、ＨＤＩ系ウレア化合物の質量に対して、水の質量が２０倍〜１２０倍上であることが好ましく、特に２０倍から８０倍が好ましい。水の量が少なすぎる場合は、ウレア化合物への水の拡散が不十分になると思われる。多すぎる場合はウレア化合物への二酸化炭素の拡散が不十分になると思われる。   The ratio of the HDI-based polyurea compound to water is preferably 20 to 120 times, more preferably 20 to 80 times the mass of water relative to the mass of the HDI urea compound. If the amount of water is too small, the diffusion of water into the urea compound will be insufficient. If the amount is too large, the diffusion of carbon dioxide into the urea compound will be insufficient.

ＨＤＩ系ポリウレア化合物の分解時間は、特に制限されないが、所定温度に達した後、１分〜３００分、好ましくは１分〜１５０分の範囲で行う。   The decomposition time of the HDI-based polyurea compound is not particularly limited, but is 1 minute to 300 minutes, preferably 1 minute to 150 minutes after reaching a predetermined temperature.

水と、ＨＤＩ系ポリウレア化合物の混合加熱は、以下のいずれの方法によってもよいが、３）が好ましい。
１）水とＨＤＩ系ポリウレア化合物とを予め所定の温度にしておいて混合する。
２）水を、ＨＤＩ系ポリウレア化合物と混合したときに所定温度になるように加熱しておき、加熱された水とＨＤＩ系ポリウレア化合物とを混合することにより分解温度とする。
３）水とＨＤＩ系ポリウレア化合物を予めスラリー調製ドラム等において所定濃度になるように混合してスラリーを調製した後、分解温度まで加熱する。 Mixing and heating of water and the HDI-based polyurea compound may be performed by any of the following methods, but 3) is preferable.
1) Water and an HDI-based polyurea compound are mixed at a predetermined temperature.
2) Water is heated to a predetermined temperature when mixed with the HDI polyurea compound, and the decomposition temperature is set by mixing the heated water and the HDI polyurea compound.
3) Water and an HDI-based polyurea compound are mixed in advance in a slurry preparation drum or the like so as to have a predetermined concentration to prepare a slurry, and then heated to a decomposition temperature.

このようにしてＨＤＩ系ポリウレア化合物を分解して得られた水溶液中には、ＨＤＡが主成分として含まれていることは言うまでもなく、ＨＤＡを通常の蒸留や抽出等の方法によって容易に回収することができる。回収されたＨＤＡは、必要によりさらに精製されたのち、ＨＤＩ製造工程に原料として用いることができる。その他、ナイロンなどＨＤＡから得られる各種樹脂の原料としても使用可能である。   It goes without saying that HDA is contained as a main component in the aqueous solution obtained by decomposing the HDI-based polyurea compound as described above, and HDA can be easily recovered by a method such as ordinary distillation or extraction. Can do. The recovered HDA can be used as a raw material in the HDI production process after further purification if necessary. In addition, it can be used as a raw material for various resins obtained from HDA such as nylon.

ＨＤＡが分離された水溶液中には二酸化炭素を主成分とする軽沸点成分が溶解しているが、これをスチームストリッピング等を実施することにより除去したのち、あるいは除去することなく、加水分解用の水として循環使用することもできる。あるいは、通常の廃水処理をしたのち排水することもできる。   A light boiling component mainly composed of carbon dioxide is dissolved in the aqueous solution from which HDA is separated, but it can be used for hydrolysis after removing it by performing steam stripping or the like without removing it. It can also be recycled as water. Or it can also drain after carrying out normal wastewater treatment.

ＨＤＩ製造時の蒸留残さとは、イソシアネートの製造設備のいずれかの工程において蒸留することによって発生した蒸留残さであればいずれでもよい。通常、主にアミン製造工程又はアミンとカルボニル源例えばホスゲンとを反応する工程で得られた反応液を蒸留することにより生じる。   The distillation residue at the time of HDI production may be any distillation residue generated by distillation in any step of the isocyanate production facility. Usually, it is produced mainly by distillation of a reaction solution obtained in an amine production step or a step of reacting an amine with a carbonyl source such as phosgene.

この蒸留残さの副生量はその製造方法によって異なるが、製造されるＨＤＩに対して約１０ｗｔ％程度の量である。この蒸留残さは通常液状であり、揮発成分を数１０％、例えば５０〜１０ｗｔ％含有している。   The amount of by-product of the distillation residue varies depending on the production method, but is about 10 wt% with respect to the produced HDI. This distillation residue is usually liquid and contains several tens of percent, for example, 50 to 10 wt% of volatile components.

本発明において、上記蒸留残さから揮発成分を実質的に含有しない状態までに回収する装置としては薄膜蒸発器、ニーダー等攪拌及び加熱手段を有する装置等通常の揮発回収工程において用いられるものが挙げられる。これらの中で特にピストンフロー性を有する二相流型蒸発装置を用いることが好ましい。   In the present invention, examples of an apparatus for recovering from the above distillation residue to a state that does not substantially contain a volatile component include those used in a normal volatile recovery process such as a thin film evaporator, an apparatus having a stirring and heating means such as a kneader. . Among these, it is particularly preferable to use a two-phase flow evaporator having piston flow properties.

ピストンフロー性を有する蒸発装置とは、装置の上流から下流への一定方向に向かって被蒸発体が流れる設備のことを意味する。二相流型蒸発装置とは、少なくとも気液、気固のいずれかの二相の流れを有する蒸発装置であり、気液固の三相が共存してもよい。   The evaporation device having piston flow property means a facility in which an evaporation target flows in a certain direction from upstream to downstream of the device. The two-phase flow type evaporator is an evaporator having at least a gas-liquid or gas-solid two-phase flow, and gas-liquid-solid three phases may coexist.

本発明の方法によれば、従来産業廃棄物として処分されていたＨＤＩ製造時の残さをアルカリ等の添加剤を使うことなく、ＨＤＡに効率よく変換することが可能となった。   According to the method of the present invention, it is possible to efficiently convert the residue at the time of producing HDI, which has been disposed of as industrial waste, into HDA without using an additive such as alkali.

以下実施例により本発明を更に詳細に説明するが、下記実施例は本発明を何等制限するものではない。   The present invention will be described in more detail with reference to the following examples. However, the following examples do not limit the present invention.

〔ＨＤＩ系ポリウレア化合物の合成〕
メカニカルスターラーをつけたセパラブルフラスコ中で、減圧蒸留したヘキサメチレンジイソシアネート（ＨＤＩ）を３２．７ｇをジメチルホルムアミド（ＤＭＦ）８０ｍｌに溶解させた。ＨＤＩのＤＭＦ溶液を撹拌しながら、蒸留水４．０ｇ／ＤＭＦ１００ｍｌの混合液を、滴下ロートを用いて、室温にて２時間かけてＨＤＩのＤＭＦ溶液に加えた。その後、８０℃のオイルバスにて８時間、撹拌しながら加熱混合を続けた。加熱後、反応液は乳濁した沈殿物を生じた。これを濾過し、濾物をアセトンとメタノールにて数回洗浄した後、減圧乾燥して、白色粉末状のＨＤＩ系ポリウレア化合物を得た。このＨＤＩ系ポリウレア化合物は、ＤＭＦ、ジメチルスホキシド（ＤＭＳＯ）、メタノール、クロロホルムには溶解しなかった。 [Synthesis of HDI-based polyurea compounds]
In a separable flask equipped with a mechanical stirrer, 32.7 g of hexamethylene diisocyanate (HDI) distilled under reduced pressure was dissolved in 80 ml of dimethylformamide (DMF). While stirring the DMF solution of HDI, a mixture of 4.0 g of distilled water / 100 ml of DMF was added to the DMF solution of HDI using a dropping funnel over 2 hours at room temperature. Thereafter, heating and mixing were continued with stirring in an oil bath at 80 ° C. for 8 hours. After heating, the reaction solution produced an emulsion precipitate. This was filtered, and the residue was washed several times with acetone and methanol, and then dried under reduced pressure to obtain a white powdery HDI polyurea compound. This HDI polyurea compound did not dissolve in DMF, dimethyl sulfoxide (DMSO), methanol, or chloroform.

〔ウレア化合物の分解〕
実施例１〜８、比較例１〜５
マグネットスターラーを入れた容量：２００ｍｌのステンレス製オートクレーブに、前記ＨＤＩ系ポリウレア化合物０．５ｇ及び所定量の水（比較例４は不使用）を仕込み、容器内の空気を二酸化炭素で置換した。その後、オートクレーブに液化炭酸ガスを仕込み、バンドヒーターを取り付けて１時間加熱し、所定の内圧及び温度に達したところで、所定の時間撹拌した。その後、氷浴にオートクレーブを浸けて、すばやく冷却した後、常圧に戻し、反応混合物をメタノールで濾過して、メタノールへの可溶物と不溶物に分けて回収した。実施例の結果を表１、２に示す。表２は、表１のデータを後述するグラフのプロットに対応させたものである。不溶物（濾物）をＦＴ−ＩＲ測定したところ（図１）、分解前のＨＤＩ系ポリウレア化合物のチャートと大きな差は見られなかった。また、可溶物を 1Ｈ−ＮＭＲ測定したところ（図２）、当該物質はヘキサメチレンジアミン（ＨＤＡ）と同定できた。 [Decomposition of urea compounds]
Examples 1-8, Comparative Examples 1-5
Capacity with magnet stirrer: A 200 ml stainless steel autoclave was charged with 0.5 g of the HDI-based polyurea compound and a predetermined amount of water (not used in Comparative Example 4), and the air in the container was replaced with carbon dioxide. Thereafter, liquefied carbon dioxide gas was charged into the autoclave, a band heater was attached and heated for 1 hour, and when a predetermined internal pressure and temperature were reached, the mixture was stirred for a predetermined time. Thereafter, the autoclave was immersed in an ice bath and quickly cooled, and then returned to normal pressure. The reaction mixture was filtered with methanol, and separated into a soluble substance and an insoluble substance in methanol. The results of the examples are shown in Tables 1 and 2. Table 2 correlates the data in Table 1 with the graph plots described below. When an FT-IR measurement was performed on the insoluble matter (filtered matter) (FIG. 1), no significant difference was found from the chart of the HDI polyurea compound before decomposition. Further, when 1 H-NMR measurement was performed on the soluble material (FIG. 2), the substance could be identified as hexamethylenediamine (HDA).

Figure 2010053055
Figure 2010053055

Figure 2010053055
Figure 2010053055

ＦＴ−ＩＲ測定条件
機器 ：ＦＴＳ３０００型ＦＴ−ＩＲ測定装置（Ｂｉｏ−Ｒａｄ社製）
測定法 ：ＫＢｒ法
検出器 ：ＭＣＴ
測定範囲：４００〜４０００ｃｍ-1
感度 ：２
分解能 ：４ｃｍ-1
積算回数：３２
1Ｈ−ＮＭＲ測定条件
溶媒 ：Ｄ2Ｏ
測定装置：超伝導多核種磁気共鳴装置ＪＮＭ−ＧＣ４００（日本電子社製）
積算回数：８回 FT-IR measurement conditions Equipment: FTS3000 type FT-IR measurement device (manufactured by Bio-Rad)
Measurement method: KBr method Detector: MCT
Measurement range: 400 to 4000 cm −1
Sensitivity: 2
Resolution: 4cm -1
Integration count: 32
1 H-NMR measurement conditions Solvent: D 2 O
Measuring apparatus: Superconducting multi-nuclide magnetic resonance apparatus JNM-GC400 (manufactured by JEOL Ltd.)
Integration count: 8 times

表１に示されている温度と圧力は、水の臨界条件（３７４℃、２２．１ＭＰａ）に達していないので、水は超臨界状態にはなっていないと判断できる。実施例１〜８の全てでＨＤＩ系ポリウレア化合物の加水分解が確認できた。しかし比較例では、ＨＤＩ系ポリウレア化合物の分解量は不十分であった。   Since the temperature and pressure shown in Table 1 have not reached the critical condition of water (374 ° C., 22.1 MPa), it can be determined that the water is not in a supercritical state. In all of Examples 1 to 8, hydrolysis of the HDI-based polyurea compound was confirmed. However, in the comparative example, the amount of decomposition of the HDI polyurea compound was insufficient.

表１、２のＲｕｎ１〜５（比較例１、実施例１〜４）について、縦軸に分解率、横軸に圧力としたグラフを図３に示す。図３から、Ｒｕｎ２で分解率９９％を達成し、Ｒｕｎ３〜５では分解率は１００％であった。これは、圧力が高いと、二酸化炭素がＨＤＩ系ポリウレア化合物へ十分に拡散し、ウレア基間の水素結合を阻害して、ＨＤＩ系ポリウレア化合物の結晶性を低下させたためと考えられる。この結果から、分解時の圧力は３ＭＰａ以上、好ましくは４．８ＭＰａ以上が適しているということが言える。   For Runs 1 to 5 in Tables 1 and 2 (Comparative Example 1 and Examples 1 to 4), FIG. From FIG. 3, the degradation rate of 99% was achieved with Run 2, and the degradation rate of Runs 3 to 5 was 100%. This is presumably because, when the pressure was high, carbon dioxide was sufficiently diffused into the HDI-based polyurea compound to inhibit hydrogen bonding between the urea groups, thereby reducing the crystallinity of the HDI-based polyurea compound. From this result, it can be said that the pressure during decomposition is 3 MPa or more, preferably 4.8 MPa or more.

表１、２のＲｕｎ７、６、３（比較例３、２、実施例３）について、縦軸に分解率、横軸に温度としたグラフを図４に示す。図４から、十分な分解率となるためには、温度が１８０℃以上であることが分かる。この結果から、分解時の温度は１８０℃以上、好ましくは１８５℃以上が適しているということが言える。   For Runs 7, 6, and 3 (Comparative Examples 3, 2, and Example 3) in Tables 1 and 2, a graph with the vertical axis representing the decomposition rate and the horizontal axis representing temperature is shown in FIG. FIG. 4 shows that the temperature is 180 ° C. or higher in order to achieve a sufficient decomposition rate. From this result, it can be said that the temperature during decomposition is 180 ° C or higher, preferably 185 ° C or higher.

表１、２のＲｕｎ９、１０、３、１１（実施例５、６、２、比較例５）について、縦軸に分解率、横軸に水仕込み量としたグラフを図５に示す。図５から、Ｒｕｎ９、１０、３は、分解率が９０％以上あり、良好な結果となったが、Ｒｕｎ１１の分解率は非常に低いものであった。水の量が多すぎる場合は、二酸化炭素の拡散レベルが低いためと考えられる。この結果から、ＨＤＩ系ポリウレア化合物の質量に対して、水の質量が２０倍〜１２０倍が最適範囲であることが言える。   For Run 9, 10, 3, and 11 (Examples 5, 6, 2, and Comparative Example 5) in Tables 1 and 2, a graph in which the vertical axis represents the decomposition rate and the horizontal axis represents the amount of water charged is shown in FIG. From FIG. 5, Runs 9, 10 and 3 had a decomposition rate of 90% or more and gave good results, but the decomposition rate of Run 11 was very low. If the amount of water is too large, it is thought that the diffusion level of carbon dioxide is low. From this result, it can be said that the mass of water is 20 to 120 times the optimum range with respect to the mass of the HDI-based polyurea compound.

Ｒｕｎ６における、分解前のＨＤＩ系ポリウレア化合物及び分解後の濾物のＦＴ−ＩＲチャートである。It is a FT-IR chart of the HDI type | system | group polyurea compound before decomposition | disassembly and the filtrate after decomposition | disassembly in Run6. メタノール可溶物の1Ｈ−ＮＭＲチャートである。It is a 1 H-NMR chart of methanol soluble matter. 温度一定下（１９０℃）、圧力を変化させたときのＨＤＩ系ポリウレア化合物の分解結果である。It is a decomposition | disassembly result of a HDI type | system | group polyurea compound when a pressure is changed under constant temperature (190 degreeC). 圧力一定下（６．８ＭＰａ）、温度を変化させたときのＨＤＩ系ポリウレア化合物の分解結果である。It is a decomposition | disassembly result of a HDI type polyurea compound when temperature is changed under fixed pressure (6.8MPa). 温度一定（１９０℃）、圧力ほぼ一定（６．８〜７．０ＭＰａ）下、水添加量を変化させたときのＨＤＩ系ポリウレア化合物の分解結果である。It is a decomposition | disassembly result of a HDI type | system | group polyurea compound when the amount of water addition is changed under constant temperature (190 degreeC) and pressure substantially constant (6.8-7.0 MPa).

符号の説明Explanation of symbols

図１において
（ａ）：分解前のＨＤＩ系ポリウレア化合物のＦＴ−ＩＲチャートである。
（ｂ）：分解後の濾物のＦＴ−ＩＲチャートである。
図２において
ａ：アミノ基に隣接するメチレン基の水素のピークである。
ｂ：アミノ基からメチレン基を１個分乖離したところのメチレン基の水素のピークである。
ｃ：アミノ基からメチレン基を２個分乖離したところのメチレン基の水素のピークである。

FIG. 1A is an FT-IR chart of an HDI-based polyurea compound before decomposition.
(B): FT-IR chart of the filtrate after decomposition.
In FIG. 2, a is a hydrogen peak of a methylene group adjacent to the amino group.
b: Hydrogen peak of methylene group when one methylene group is separated from amino group.
c: Hydrogen peak of methylene group when two methylene groups are separated from the amino group.

Claims (4)

ヘキサメチレンジイソシアネート系ポリウレア化合物を超臨界状態又は亜臨界状態の二酸化炭素中で加水分解して、ヘキサメチレンジアミンを回収することを特徴とする、ヘキサメチレンジイソシアネート系ポリウレア化合物の分解処理方法。   A method for decomposing a hexamethylene diisocyanate polyurea compound, wherein the hexamethylene diisocyanate polyurea compound is hydrolyzed in carbon dioxide in a supercritical state or a subcritical state to recover hexamethylenediamine. 加水分解時の圧力が３ＭＰａ以上であることを特徴とする、請求項１記載のヘキサメチレンジイソシアネート系ポリウレア化合物の分解処理方法。   The method for decomposing a hexamethylene diisocyanate-based polyurea compound according to claim 1, wherein the pressure during hydrolysis is 3 MPa or more. 加水分解時の温度が１８０℃以上であることを特徴とする、請求項１又は２記載のヘキサメチレンジイソシアネート系ポリウレア化合物の分解処理方法。   The method for decomposing a hexamethylene diisocyanate polyurea compound according to claim 1 or 2, wherein the temperature during hydrolysis is 180 ° C or higher. ヘキサメチレンジイソシアネート系ポリウレア化合物の質量に対して、水の質量が２０倍〜１２０倍であることを特徴とする、請求項１から３のいずれか１項に記載のヘキサメチレンジイソシアネート系ポリウレア化合物の分解処理方法。
The decomposition of the hexamethylene diisocyanate polyurea compound according to any one of claims 1 to 3, wherein the mass of water is 20 to 120 times the mass of the hexamethylene diisocyanate polyurea compound. Processing method.
JP2008218165A 2008-08-27 2008-08-27 Method for decomposing hexamethylene diisocyanate-based polyurea compound Pending JP2010053055A (en)

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