EP3976683A1 - Aptitude à la distillation améliorée par dilution avec un constituant à séparer - Google Patents

Aptitude à la distillation améliorée par dilution avec un constituant à séparer

Info

Publication number
EP3976683A1
EP3976683A1 EP20726448.2A EP20726448A EP3976683A1 EP 3976683 A1 EP3976683 A1 EP 3976683A1 EP 20726448 A EP20726448 A EP 20726448A EP 3976683 A1 EP3976683 A1 EP 3976683A1
Authority
EP
European Patent Office
Prior art keywords
diisocyanate
mixture
reaction product
optionally
distillation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20726448.2A
Other languages
German (de)
English (en)
Inventor
Jan SUETTERLIN
Helen HERMES
Thomas Fischer
Joachim Stump
Ulrich GEREON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covestro Deutschland AG
Original Assignee
Covestro Intellectual Property GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Covestro Intellectual Property GmbH and Co KG filed Critical Covestro Intellectual Property GmbH and Co KG
Publication of EP3976683A1 publication Critical patent/EP3976683A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/10—Vacuum distillation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/12—Molecular distillation
    • 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
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • 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
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4825—Polyethers containing two hydroxy 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • 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
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
    • C08G18/4845—Polyethers containing oxyethylene units and other oxyalkylene units containing oxypropylene or higher oxyalkylene 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
    • 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
    • C08G18/82—Post-polymerisation treatment
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/125—Water, e.g. hydrated salts
    • 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
    • C08G2101/00—Manufacture of cellular products
    • 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
    • C08G2110/00—Foam properties
    • C08G2110/0083—Foam properties prepared using water as the sole blowing agent
    • 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
    • C08G2150/00—Compositions for coatings
    • 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
    • C08G2170/00—Compositions for adhesives
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/10—Water or water-releasing compounds
    • 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
    • C08J2375/04—Polyurethanes
    • C08J2375/08—Polyurethanes from polyethers

Definitions

  • the invention relates to a method for purifying at least one reaction product of at least one diisocyanate comprising at least the following steps: (A) providing a mixture A at least containing the at least one reaction product of the at least one diisocyanate and optionally the at least one diisocyanate, (B) adding, optionally further, at least one diisocyanate to mixture A from step (A) to obtain a mixture B, and (C) distillative separation of the at least one diisocyanate from mixture B from step (B) to give the purified at least one reaction product of the at least one diisocyanate to obtain.
  • the present invention further comprises the reaction product of at least one diisocyanate, obtainable by the process according to the invention and its use for the production of polyurethane foams, polyurethane hydrogels, polyurethane elastomers, paints and adhesives.
  • Modification of diisocyanates for example trimerization, reaction of the at least one diisocyanate with polyols to obtain NCO-terminated prepolymers, urea formation, urethanization, biuretization, allophanation or combinations of these reactions result in the corresponding polyisocyanates, with a remainder of unreacted, monomeric diisocyanate in the Raw product remains. This residue is usually removed by distillation in vacuo and recycled after condensation. Too high a viscosity, for example greater than 500 mPas, of the crude product often causes problems, since this has an unfavorable effect on the distribution in the distillation apparatus. Sometimes special pumps are required that are designed for pumping highly viscous liquids.
  • the present invention was based on the object of eliminating at least one, preferably several of the above-mentioned disadvantages of the prior art.
  • the present invention was based on the object of providing a process for the purification of reaction products of diisocyanates in which the previously prevailing disadvantages, for example inadequate conveyability of the crude product or inadequate separation efficiency in the distillation, can be avoided.
  • this object was achieved by the process for purifying at least one reaction product of at least one diisocyanate comprising at least the following steps:
  • a reaction product of at least one diisocyanate obtainable by the process according to the invention, by its use for the production of polyurethane foams, polyurethane hydrogels, polyurethane elastomers, paints and adhesives and by a process for the production of polyurethane foams.
  • Step (A) of the process according to the invention comprises providing a mixture A at least comprising the at least one reaction product of the at least one diisocyanate and optionally the at least one diisocyanate.
  • any reaction product of at least one diisocyanate known to the person skilled in the art can be treated as long as a mixture is obtained in its preparation which contains the reaction product of the at least one diisocyanate and optionally the at least one diisocyanate (mixture A).
  • the present invention relates to the process according to the invention, mixture A being obtained by trimerization of the at least one diisocyanate, reaction of the at least one diisocyanate with polyols to obtain NCO-terminated prepolymers, urea formation, urethanization, biuretization, allophanatization, carbodiimidization, uretdione formation , Uretonimine formation,
  • the reaction of the at least one diisocyanate with at least one polyol takes place, for example, preferably at a temperature of 50 to 130.degree. C., particularly preferably at 60 to 120.degree.
  • Suitable catalysts for the reaction of the at least one diisocyanate with at least one polyol are selected, for example, from the group consisting of catalytically active metal salts, amines, amidines, guanidines and mixtures thereof.
  • Examples include tin dibutyl dilaurate (DBTL), tin acetate, 1,8-diazabicyclo [5.4.0] undecene-7 (DBU), 1,5-diazabicyclo [4.3.0] nonene-5 (DBN), 1,4-diazabicyclo [3.3.0] octen-4 (DBO), N-ethylmorpholine (NEM), triethylenediamine (DABCO), pentamethylguanidine (PMG), tetramethylguanidine (TMG), cyclotetramethylguanidine (TMGC), n-decyltetramethylguanidine (TMGD), n-dodecyltetramethylguanidine TMGDO), dimethylaminoethyltetramethylguanidine (TMGN), 1,1,4,4,5,5-hexamethylisobiguanidine (HMIB), phenyltetramethylguanidine (TMGP) and hexamethylene oc
  • Suitable polyols are selected, for example, from the group consisting of polyether polyols, polyester polyols, polycarbonate polyols, polysiloxane polyols and mixtures thereof. According to the invention, it is particularly preferred to use polyether polyols, in particular polymers of ethylene oxide and / or propylene oxide.
  • the in step (A) of the process according to the invention essentially, i. at least 5% by weight, preferably at least 10% by weight, particularly preferably at least 30% by weight, of a reaction product of at least one diisocyanate, in particular a diisocyanate.
  • step (A) it is possible and preferred for a mixture to be obtained in step (A) which contains the reaction product of the at least one diisocyanate and the at least one diisocyanate. According to the invention, it is also possible, but less preferred, for a mixture to be obtained in step (A) which contains the reaction product of the at least one diisocyanate but not the at least one diisocyanate.
  • the at least one diisocyanate is selected from the group consisting of diisocyanates with aliphatically, cycloaliphatically, araliphatically and / or aromatically bound isocyanate groups.
  • the at least one diisocyanate is particularly preferably selected from the group consisting of hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), butylene diisocyanate (BDI), pentamethylene diisocyanate (PDI), bisisocyanatocyclohexylmethane (HMDI), 2,2,4-trimethylhexamethylene diisocyanate, bisisocyanatomethylcyclohexane, Bisisocyanatomethyltricyclodecane, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate, norbornane diisocyanate, cyclohexane diisocyanate, toluene-2,4-diisocyanate (2,4-TDI), toluene-2,6-diisocyanate (2,6-TDI), 2,2'- Methylene diphenyl diisocyanate (2,2'-
  • the at least one diisocyanate is very particularly preferably selected from the group consisting of hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), butylene diisocyanate (BDI), pentamethylene diisocyanate (PDI), bisisocyanatocyclohexylmethane (HMDI), 2,2,4-trimethylhexamethylene diisocyanate, bisisocyanatomethylcyclohexane , Bisisocyanatomethyltricyclodecane, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate, norbornane diisocyanate, cyclohexane diisocyanate, toluene-2,4-diisocyanate (2,4-TDI), toluene-2,6-diisocyanate (2,
  • HDI hexamethylene diisocyanate
  • IPDI isophorone
  • mixture A can depend on the reaction by which the respective reaction product is obtained.
  • mixture A preferably contains the at least one diisocyanate in an amount of 0.1 to 90% by weight, particularly preferably 2 to 80% by weight, in each case based on mixture A.
  • mixture A preferably has a viscosity of 500 to 50,000 mPas, preferably 1000 to 10,000 mPas.
  • This increased viscosity of the mixture A obtained according to the invention is disadvantageous for the distillation necessary to separate off the unreacted at least one diisocyanate.
  • the viscosity is determined at 23 ° C in accordance with DIN 53019.
  • Step (B) of the process according to the invention comprises the addition of, if appropriate further, diisocyanate to mixture A from step (A) in order to obtain mixture B.
  • step (A) a mixture A containing at least the at least one reaction product of the at least one diisocyanate and the at least one diisocyanate is provided, further diisocyanate is added to the mixture A from step (A) in step (B) to get mixture B.
  • step (A) a mixture A at least comprising the at least one reaction product of the at least one diisocyanate but not the at least one diisocyanate is provided, in step (B) diisocyanate is converted into mixture A from step (A) given to obtain mixture B.
  • step (B) the same at least one diisocyanate is added in step (B) which has already been used in step (A).
  • step (C) the same at least one diisocyanate is added in step (B) which has already been used in step (A).
  • step (B) of the process according to the invention enough of the at least one diisocyanate is added in step (B) of the process according to the invention that the viscosity of mixture B is low enough to be advantageously distilled according to the invention.
  • Mixture B preferably has a viscosity of 100 to 1400 mPas, preferably 150 to 1000 mPas. The viscosity is determined at 23 ° C in accordance with DIN 53019.
  • the at least one diisocyanate is obtained in step (B) in an amount of 1 to 60% by weight, preferably 5 to 50% by weight, particularly preferably 8 to 45% by weight, in each case on mixture A, added.
  • mixture B preferably contains the at least one diisocyanate in an amount of 1 to 94% by weight, particularly preferably 9 to 86% by weight, based on mixture B.
  • Step (C) of the process according to the invention comprises separating off the diisocyanate from mixture B from step (B) by distillation in order to obtain the purified reaction product of the at least one diisocyanate.
  • Mixture B which is treated by distillation in step (C) of the process according to the invention, contains the at least one reaction product of the at least one diisocyanate, the at least one diisocyanate and optionally further by-products which depend on the particular reaction carried out.
  • Mixture B preferably contains only the at least one reaction product of the at least one diisocyanate and the at least one diisocyanate.
  • the at least one diisocyanate is accordingly preferably separated off by distillation in order to free the at least one reaction product from the excess of at least one diisocyanate.
  • the at least one diisocyanate in a preferred embodiment of the process according to the invention preferably has a lower boiling point than the at least one reaction product, the at least one diisocyanate is preferably separated off from the at least one reaction product by distillation.
  • step (C) of the process according to the invention can generally be carried out by any of the processes known to the person skilled in the art.
  • the present invention preferably relates to the process according to the invention, the separation by distillation in step (C) taking place at a temperature of 105 to 235.degree. C., preferably 110 to 160.degree.
  • step (C) of the process according to the invention takes place by means of molecular distillation, for example with the aid of a short-path evaporator, thin-film evaporator, falling-film evaporator or combinations thereof.
  • Step (C) of the process according to the invention is particularly preferably carried out in a combination of a pre-evaporator and a main evaporator.
  • the temperature in the pre-evaporator is preferably 5 to 20 ° C., particularly preferably 5 to 15 ° C., higher than in the main evaporator.
  • the pressure in the pre-evaporator and main evaporator is preferably the same.
  • the pressure in step (C) of the process according to the invention can generally be selected by the person skilled in the art so that, depending on the temperature selected, the at least one diisocyanate can be distilled off.
  • the present invention preferably relates to the process according to the invention, the separation by distillation in step (C) taking place at a pressure of 0.01 to 10 mbar (a), preferably 0.1 to 1 mbar (a).
  • Step (C) of the process according to the invention is preferably carried out in such a way that, on the one hand, the desired product is as pure as possible, i.e. As free as possible from at least one diisocyanate, and secondly the at least one diisocyanate can be obtained in the highest possible purity.
  • the present invention therefore preferably relates to the process according to the invention, the purified at least one reaction product of the at least one diisocyanate obtained in step (C) having a content of at least one diisocyanate of 0.001 to 0.5% by weight, based on the reaction product.
  • the present invention further relates to the process according to the invention, the at least one diisocyanate separated off in step (C) being obtained in a purity of at least 96% by weight, particularly preferably at least 97% by weight.
  • the purity is preferably at most 99.99% by weight.
  • the distillate obtained in step (C) according to the present invention i.e. 1,6-hexamethylene diisocyanate (HDI), preferably an NCO content of at least 49.0% by weight, particularly preferably at least 49.1% by weight.
  • the NCO content is preferably at most 50% by weight.
  • the NCO content is preferably at least 0.01% by weight.
  • the residual diisocyanate content is determined by gas chromatography in accordance with DIN EN ISO 10283.
  • the viscosity is determined at 23 ° C in accordance with DIN 53019.
  • the at least one diisocyanate separated off in step (C) of the process according to the invention can, according to the invention, be particularly advantageously used in the synthesis of at least one further Reaction product of the at least one diisocyanate according to step (A) or for diluting the reaction solution according to step (B) of the process according to the invention are used.
  • the present invention therefore preferably relates to the process according to the invention, the at least one diisocyanate separated off by distillation in step (C) being at least partially used to prepare the reaction product present in mixture A.
  • the present invention preferably relates to the process according to the invention, the at least one diisocyanate separated off by distillation in step (C) being used at least partially in step (B).
  • the purity of the at least one diisocyanate which is separated off in step (C) in the process according to the invention is higher than the purity of at least one diisocyanate which is obtained by distillation without prior, optionally further, diisocyanate being added has been.
  • the observed effect goes beyond the pure dilution effect. That this can be attributed to a surprisingly more efficient separation by distillation is also shown by the higher proportion of oligomers less than 1000 g / mol, for example dimers and trimers, in the reaction product.
  • the present invention also relates to the reaction product of at least one diisocyanate, obtainable by the process according to the invention.
  • the present invention relates to the reaction product according to the invention, where it is an NCO-terminated prepolymer.
  • the present invention further preferably relates to the at least one reaction product of the at least one diisocyanate, where it has a residual diisocyanate content of at most 0.5% by weight, preferably at most 0.3% by weight.
  • the NCO content is preferably at least 0.001% by weight.
  • the present invention further preferably relates to the at least one reaction product of the at least one diisocyanate, with a content of compounds with a molecular weight of less than 1000 g / mol of 0.1 to 50% by weight, particularly preferably 0.5 to 10% by weight .-%, having.
  • the present invention further preferably relates to the at least one reaction product of the at least one diisocyanate, where it has a viscosity of 500 to 100,000 mPas, particularly preferably 1,000 to 50,000 mPas.
  • the viscosity is determined at 23 ° C in accordance with DIN 53019.
  • the present invention also includes the use of the reaction product according to the invention for the production of polyurethane foams, polyurethane hydrogels, polyurethane elastomers, paints and adhesives.
  • the present invention also relates to a method for producing polyurethane foams, wherein a composition comprising a reaction product according to the invention, water, optionally oligomers produced from at least two low molecular weight diisocyanates, the diisocyanates having a molar mass of 140 to 278 g / mol, optionally catalysts, optionally salts weak acids whose corresponding free acids in water at 25 ° C. have a pKa value of> 3.0 and ⁇ 14.0, optionally surfactants, optionally monohydric or polyhydric alcohols or polyols, optionally hydrophilic polyisocyanates, provided, foamed and cured becomes.
  • the invention relates to a process for purifying at least one reaction product of at least one diisocyanate comprising at least the following steps:
  • the invention relates to a process according to embodiment 1, characterized in that mixture A is obtained by trimerizing the at least one diisocyanate, reacting the at least one diisocyanate with polyols to obtain NCO-terminated prepolymers, urea formation, urethanization, biuretization, allophanation , Carbodiimidization, uretdione formation, uretonimine formation,
  • the invention relates to a method according to embodiment 1 or 2, characterized in that mixture A contains the at least one diisocyanate in an amount of 0.1 to 90% by weight, based on mixture A.
  • the invention relates to a method according to one of embodiments 1 to 3, characterized in that mixture B contains the at least one diisocyanate in an amount of 1 to 94% by weight, based on mixture B.
  • the invention relates to a method according to one of embodiments 1 to 4, characterized in that in step (B) the at least one diisocyanate in an amount of 1 to 60% by weight, preferably 5 to 50% by weight , particularly preferably 8 to 45 wt .-%, each based on mixture A, is added.
  • the invention relates to a method according to one of embodiments 1 to 5, characterized in that the purified at least one reaction product of the at least one diisocyanate obtained in step (C) has a content of at least one diisocyanate of 0.001 to 0.5 wt. -%, based on the at least one reaction product, contains.
  • the invention relates to a method according to one of the
  • Embodiments 1 to 6 characterized in that mixture A has a viscosity of 500 to 50,000 mPas, preferably 1000 to 10,000 mPas, the viscosity being determined at 23 ° C according to DIN 53019.
  • the invention relates to a method according to one of the
  • Embodiments 1 to 7 characterized in that mixture B has a viscosity of 100 to 1400 mPas, preferably 150 to 1000 mPas, the viscosity being determined at 23 ° C according to DIN 53019.
  • the invention relates to a method according to one of the
  • Embodiments 1 to 8 characterized in that the at least one diisocyanate is selected from the group consisting of diisocyanates with aliphatically, cycloaliphatically, araliphatically and / or aromatically bound isocyanate groups.
  • the invention relates to a method according to one of the
  • Embodiments 1 to 9 characterized in that the at least one diisocyanate is selected from the group consisting of hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), butylene diisocyanate (BDI), pentamethylene diisocyanate (PDI), bisisocyanatocyclohexyl methane (HMDI), 2, 2 , 4-trimethylhexamethylene diisocyanate,
  • HDI hexamethylene diisocyanate
  • IPDI isophorone diisocyanate
  • BDI butylene diisocyanate
  • PDI pentamethylene diisocyanate
  • HMDI bisisocyanatocyclohexyl methane
  • 2, 2 4-trimethylhexamethylene diisocyanate
  • the invention relates to a method according to one of embodiments 1 to 10, characterized in that the distillative separation in step (C) takes place at a temperature of 105 to 235 ° C, preferably 110 to 160 ° C.
  • the invention relates to a method according to one of embodiments 1 to 11, characterized in that the distillative separation in step (C) at a pressure of 0.01 to 10 mbar (a), preferably 0.1 to imbar ( a).
  • the invention relates to a process according to one of embodiments 1 to 12, characterized in that the at least one diisocyanate separated off by distillation in step (C) is at least partially used to produce the at least one reaction product present in mixture A.
  • the invention relates to a method according to one of embodiments 1 to 13, characterized in that the at least one diisocyanate separated off by distillation in step (C) is used at least partially in step (B).
  • the invention relates to a method according to one of embodiments 1 to 14, characterized in that the at least one diisocyanate separated off in step (C) has a purity of at least 96% by weight, particularly preferably at least 97% by weight is obtained.
  • the invention relates to a method according to one of embodiments 1 to 15, characterized in that the at least one diisocyanate is selected from the group consisting of hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), butylene diisocyanate (BDI) and pentamethylene diisocyanate (PDI ), Bisisocyanatocyclohexyl methane (HMDI), 2, 2, 4-trimethyl-hexamethylene diisocyanate,
  • HDI hexamethylene diisocyanate
  • IPDI isophorone diisocyanate
  • BDI butylene diisocyanate
  • PDI pentamethylene diisocyanate
  • HMDI Bisisocyanatocyclohexyl methane
  • 2, 2, 4-trimethyl-hexamethylene diisocyanate 2, 2, 4-trimethyl-hexamethylene diisocyanate
  • Bisisocyanatomethylcyclohexane BisisocyanatomethyHtricyclo-decane, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate, norbornane diisocyanate, cyclohexane diisocyanate, toluene-2,4-diisocyanate (2,4-TDI), toluene-2,6-diisocyanate (2,6-TDI) and mixtures thereof.
  • XDI xylylene diisocyanate
  • tetramethylxylylene diisocyanate norbornane diisocyanate
  • cyclohexane diisocyanate toluene-2,4-diisocyanate (2,4-TDI), toluene-2,6-diisocyanate (2,6-TDI) and mixtures thereof.
  • the invention relates to a reaction product of at least one diisocyanate, obtainable by the process according to one of embodiments 1 to 16.
  • the invention relates to a reaction product according to embodiment 17, characterized in that it is an NCO-terminated prepolymer.
  • the invention relates to a use of the at least one reaction product according to embodiment 17 or 18 for the production of polyurethane foams, polyurethane hydrogels, polyurethane elastomers, paints and adhesives.
  • the invention relates to a method for producing polyurethane foams, characterized in that a composition comprising at least one reaction product according to embodiment 17 or 18, water, optionally oligomers produced from at least two low molecular weight diisocyanates, the diisocyanates having a molar mass of 140 to 278 g / mol, optionally catalysts, optionally salts of weak acids whose corresponding free acids in water at 25 ° C. have a pKa value of> 3.0 and ⁇ 14.0, optionally surfactants, optionally monohydric or polyhydric alcohols or polyols , optionally hydrophilic polyisocyanates, provided, foamed and cured.
  • a composition comprising at least one reaction product according to embodiment 17 or 18, water, optionally oligomers produced from at least two low molecular weight diisocyanates, the diisocyanates having a molar mass of 140 to 278 g / mol, optionally catalysts, optionally salts of weak acids
  • this mixture was in each case diluted with HDI according to Table 1 in order to obtain the corresponding starting mixtures (AM).
  • the mixture that emerged from the synthesis mentioned above (experiments VI, V2 and V3) and the starting mixtures (experiments 4, 5, 6, 7, 8 and 9) were at the temperatures specified in table 1 (VV: pre-evaporator, HV: main evaporator) and in each case a pressure of 0.7 mbar (a) distilled.
  • the NCO content of the distillate From the distillates obtained or the distillation residues, which represent the respective product, the NCO content of the distillate, the HDI content of the distillate, the NCO content of the product, the viscosity of the product, the weight average molecular weight (Mw) of the product, the residual HDI content of the product and the proportion of compounds with a molecular weight of less than 1000 g / mol are determined by the methods given below.
  • the viscosity was determined at 23 ° C. and was carried out in accordance with DIN 53019.
  • the NCO contents were determined volumetrically in accordance with DIN-EN ISO 11909.
  • the weight-average molecular weight (Mw), the proportion less than 1000 g / mol and the HDI content of the distillate were determined by gel permeation chromatography (GPC) in the THF solvent in accordance with DIN 55672-1.
  • the residual HDI content was determined by gas chromatography in accordance with DIN EN ISO 10283.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

L'invention concerne un procédé de purification d'au moins un produit de réaction d'au moins un diisocyanate comprenant au moins les étapes suivantes consistant (A) à fournir un mélange A contenant l'au moins un produit de réaction dudit diisocyanate et éventuellement l'au moins un diisocyanate, (B) à ajouter au moins un diisocyanate, éventuellement des diisocyanates supplémentaires, au mélange A issu de l'étape (A) afin d'obtenir un mélange B, et (C) à séparer par distillation ledit au moins un diisocyanate du mélange B issu de l'étape (B) afin d'obtenir l'au moins produit de réaction purifié dudit au moins un diisocyanate. La présente invention concerne en outre le produit de réaction d'au moins un diisocyanate, pouvant être obtenu par le procédé selon l'invention, et son utilisation pour produire des mousses de polyuréthane, des hydrogels de polyuréthane, des élastomères de polyuréthane, des laques et des adhésifs.
EP20726448.2A 2019-05-27 2020-05-20 Aptitude à la distillation améliorée par dilution avec un constituant à séparer Pending EP3976683A1 (fr)

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EP19176689.8A EP3744747A1 (fr) 2019-05-27 2019-05-27 Aptitude améliorée à la distillation par dilution au moyen d'un composant à séparer
PCT/EP2020/064043 WO2020239566A1 (fr) 2019-05-27 2020-05-20 Aptitude à la distillation améliorée par dilution avec un constituant à séparer

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WO2018076199A1 (fr) 2016-10-26 2018-05-03 Covestro Deutschland Ag Polyisocyanates à faible viscosité à base de tdi comprenant des groupes isocyanurate

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EP3744747A1 (fr) 2020-12-02
CN113840857A (zh) 2021-12-24
US20220212120A1 (en) 2022-07-07

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