EP3997141A1 - Verfahren zur herstellung von allophanat- und/oder thioallophanatgruppen enthaltenden verbindungen - Google Patents
Verfahren zur herstellung von allophanat- und/oder thioallophanatgruppen enthaltenden verbindungenInfo
- Publication number
- EP3997141A1 EP3997141A1 EP20737421.6A EP20737421A EP3997141A1 EP 3997141 A1 EP3997141 A1 EP 3997141A1 EP 20737421 A EP20737421 A EP 20737421A EP 3997141 A1 EP3997141 A1 EP 3997141A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- uretdione
- component
- groups
- compounds
- isocyanate
- 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
Links
Classifications
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- 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
- C08G18/02—Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only
- C08G18/027—Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only the polymeric products containing urethodione 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
- C08G18/08—Processes
- C08G18/16—Catalysts
- C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
- C08G18/20—Heterocyclic amines; Salts thereof
- C08G18/2009—Heterocyclic amines; Salts thereof containing one heterocyclic ring
- C08G18/2027—Heterocyclic amines; Salts thereof containing one heterocyclic ring having two nitrogen atoms in the ring
-
- 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
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
- C08G18/798—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing urethdione groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- 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
Definitions
- the present invention relates to a process for the production of compounds containing allophanate and / or thioallophanate groups, compositions containing uretdione groups and the use of these compositions for the production of polyurethane plastics or coatings.
- the invention also relates to coating compositions containing the compositions and substrates coated with the coating composition.
- Polyaddition products containing uretdione groups are known as crosslinking components for thermally crosslinkable polyurethane (PUR) lacquer and adhesive compositions.
- the crosslinking principle used in these products is the thermal ring opening of the uretdione groups to form isocyanate groups and their reaction with a hydroxy-functional or amino-functional binder.
- crosslinkers containing uretdione groups are used today almost exclusively for the production of split-free polyurethane (PUR) powder coatings (e.g. DE-A 2 312 391, DE-A 2 420 475, EP-A 0 045 994, EP-A 0 045 996, EP-A 0 045 998, EP-A 0 639 598 or EP-A 0 669 353).
- PUR polyurethane
- DBN 1, 5-d
- Lewis acid catalysts such as the tin or zinc compounds mentioned above, are inhibited by acid groups such as carboxyl groups. They can therefore only develop their full catalytic activity in a uretdione system if the hydroxy-functional binder used is free from carboxyl groups. This can be achieved, for example, by simultaneously adding a sufficient amount of an agent which is reactive towards carboxyl groups, for example a carbodiimide or an epoxide.
- quaternary ammonium hydroxides and ammonium fluorides e.g. EP-A 1 334 987
- ammonium carboxylates e.g. EP-A 1 475 399, EP-A 1 522
- phosphonium hydroxides, alcoholates or carboxylates e.g. WO 2005/085315
- metal hydroxides and alcoholates e.g. EP-A 1 475 400
- a uretdione structure can react in two ways during curing, the complete splitting into two isocyanate groups, which subsequently form urethane groups with two hydroxyl groups of the polyol, or a ring opening only on one side with only one hydroxyl group of the polyol to form an allophanate structure.
- both reactions take place side by side in catalyzed uretdione systems, the preference between the two reaction products shifting with the curing conditions, in particular the temperature.
- the trimerization of isocyanate groups to give isocyanurate structures can often be observed to varying degrees.
- the object of the present invention was therefore to provide new catalysts for lowering the hardening temperature of uretdione systems, which lead to the most complete conversion of the uretdione structures and thereby provide a fixed ratio of the reaction products regardless of the hardening temperature.
- compositions containing catalyzed uretdione groups described in more detail below were provided.
- the present invention is based on the surprising observation that special salts with an imidazolium or dihydroimidazolium structure are highly effective catalysts for the reaction of uretdiones with alcohols and / or thiols, with only allophanate, thioallophanate and optionally isocyanurate structures in a fixed ratio.
- WO 201 1/061314 also describes imidazolium salts as a possible alternative to toxicologically questionable tin catalysts, such as. B. dibutyltin dilaurate (DBTL), for the reaction of isocyanates with polyols in polyurethane synthesis.
- B. dibutyltin dilaurate (DBTL) for the reaction of isocyanates with polyols in polyurethane synthesis.
- DBTL dibutyltin dilaurate
- this publication includes a blanket list of possible starting polyisocyanates for urethanization including those with a uretdione structure, there is no mention of the particular suitability of imidazolium and dihydroimidazolium compounds as catalysts for selective uretdione cleavage with the formation of allophanate or Thioallophanate structures.
- R 1 , R 2 , R 3 , R 4 , R 5 and R 6 independently represent identical or different radicals which are saturated or unsaturated, linear or branched, aliphatic, cycloaliphatic, araliphatic or aromatic organic radicals having 1 to 18 carbon atoms , which are substituted or unsubstituted and / or have heteroatoms in the chain, the radicals also in combination with one another, optionally together with another Can form heteroatom rings with 3 to 8 carbon atoms, which can optionally be further substituted, wherein
- R 3 , R 4 , R 5 and R 6 can independently also represent hydrogen
- R 7 represents hydrogen or a carboxylate anion (COO).
- the present invention relates to a process for the preparation of compounds containing allophanate and / or thioallophanate groups, comprising the reaction of
- R 1 , R 2 , R 3 , R 4 , R 5 and R 6 independently represent identical or different radicals which are saturated or unsaturated, linear or branched, aliphatic, cycloaliphatic, araliphatic or aromatic organic radicals having 1 to 18 carbon atoms , which are substituted or unsubstituted and / or have heteroatoms in the chain, the radicals also in combination with one another, optionally together with another heteroatom, can form rings with 3 to 8 carbon atoms, which can optionally be further substituted, where
- R 3 , R 4 , R 5 and R 6 can independently also represent hydrogen
- R 7 stands for hydrogen or a carboxylate anion (COO), with the at least one component A) having at least one uretdione group being polyaddition compounds A2) obtainable by reacting isocyanate-functional uretdione groups with compounds A1) with alcohols and / or amines, which in solvent-free form have a content of free isocyanate groups of less than 5% by weight.
- the references to “comprising”, “containing” etc. preferably mean “essentially consisting of” and very particularly preferably “consisting of”.
- the uretdione-containing component A) is any desired, optionally isocyanate-functional uretdione-containing compounds A1), as are obtainable by methods known per se, for example by oligomerizing monomeric isocyanates, and / or by reacting compounds A1) containing isocyanate-functional uretdione groups Polyaddition compounds A2) obtainable from alcohols and / or amines.
- the at least one component A) containing at least one uretdione group is a polyaddition compound A2) obtainable by reacting compounds A1) containing isocyanate-functional uretdione groups with alcohols and / or amines.
- Suitable isocyanates for the preparation of the uretdione-containing compounds A1) are any, in various ways, for example by phosgenation in the liquid or gas phase or by phosgene-free route, such as. B. by thermal urethane cleavage, accessible mono-, di- and triisocyanates with aliphatically, cycloaliphatically, araliphatically and / or aromatically bound isocyanate groups.
- Preferred monoisocyanates are those of the molecular weight range 99 to 300, such as.
- Preferred diisocyanates are those of the molecular weight range 140 to 400, such as 1,4-diisocyanatobutane, 1,5-diisocyanatopentane (pentamethylene diisocyanate, PDI),
- 1,6-Diisocyanatohexane hexamethylene diisocyanate, HDI
- 2-methyl-1,5-diisocyanatopentane 1,5-diisocyanato-2,2-dimethylpentane, 2,2,4- and 2,4,4-trimethyl -
- Diisododecylphenylene diisocyanates and biphenyl diisocyanates 3,3'-dimethoxybiphenyl- 4,4'-diisocyanate, 2,2‘-, 2,4'- and 4,4'-diisocyanatodiphenylmethane (MDI), 3,3'-
- NDI 1,5-diisocyanatonaphthalene
- Triisocyanatotoluene trimethylbenzene triisocyanate, diphenylmethane-2,4,4'-triisocyanate, 3-methyldiphenylmethane-4,6,4'-triisocyanate, the isomeric naphthalene triisocyanates and methylnaphthalene diisocyanates, triphenylmethane triisocyanate or 2,4-diisocyanato-1 - [(5- isocyanato-2-methylphenyl) methyl] benzene.
- a particularly suitable triisocyanate is 4-isocyanatomethyl-1,8-octane diisocyanate (triisocyanatononane; TIN).
- the use of PDI, HDI, IPDI, XDI, NBDI and / or H12-MDI is particularly preferred.
- the compounds A1) containing uretdione groups can be prepared by various methods which are generally based on the customary processes known from the literature for the oligomerization of simple diisocyanates, as described, for example, in J. Prakt. Chem.
- the compounds A1) containing uretdione groups can be free of isocyanate groups when monoisocyanates are used exclusively or in part. For their preparation, however, at least additional di- and / or triisocyanates are used in such amounts that compounds A1) containing uretdione groups are obtained which have an average NCO functionality of at least 1.6, preferably 1.8 to 3.5 , particularly preferably from 1.9 to 3.2, very particularly preferably from 2.0 to 2.7.
- these compounds A1) containing isocyanate-functional uretdione groups contain not only linear, difunctional uretdione structures, but also further, at least trifunctional polyisocyanate molecules.
- These higher functional components of the compounds A1) are in particular the known secondary products of diisocyanates with an isocyanurate, allophanate, biuret, urethane and / or iminooxadiazinedione structure.
- the compounds A1) containing uretdione groups are generally freed from the unreacted excess of monomers immediately after their preparation as described above by modifying simple monomeric mono-, di- and / or triisocyanates by known methods, for example by thin-film distillation or extraction. They therefore generally have residual amounts of monomeric diisocyanates of less than 5% by weight, preferably less than 2% by weight, particularly preferably less than 1% by weight.
- uretdione-containing component A) of the compositions according to the invention are polyaddition compounds A2), as can be obtained by reacting at least some of the free isocyanate groups of the above-described isocyanate-functional uretdione-containing compounds A1) with alcohols and / or amines.
- Suitable alcohols for the preparation of the polyaddition compounds A2) are, for example, simple aliphatic or cycloaliphatic monoalcohols, such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, the isomeric pentanols, hexanols, octanols and nonanols, n- Decanol, n-dodecanol, n-tetradecanol, n-hexadecanol, n-octadecanol, cyclohexanol, the isomeric methylcyclohexanols and hydroxymethylcyclohexane, ether alcohols such as 2-methoxyethanol, 2-ethoxyethanol, 2-propoxyethanol, 2-butoxyethanol, diethylene glycol,
- suitable alcohols for the preparation of the polyaddition compounds A2) are any at least difunctional polyols in the molecular weight range 62 to 22,000, preferably those which have an average functionality of 2 to 6 and a number average molecular weight of 62 to 18,000, particularly preferably an average functionality of 2 to 4 and a number average molecular weight of 90 to 12,000.
- Suitable polyols for producing the polyaddition compounds A2) are, for example, simple polyhydric alcohols having 2 to 14, preferably 4 to 10 carbon atoms, such as. B. 1, 2-ethanediol, 1, 2- and 1, 3-propanediol, the isomeric butanediols, pentanediols, hexanediols, heptanediols and octanediols, 1, 10-decanediol, 1, 12-dodecanediol, 1, 2- and 1, 4- cyclohexanediol, 1,4-cyclohexanedimethanol, 1,4-bis (2-hydroxyethoxy) benzene, 2,2-bis- (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (4- hydroxycyclohexyl) propane (perhydro bisphenol), 1, 2,3-propanetriol, 1, 2,4-butanetriol, 1, 1, 1-
- Dibutylene glycol or low molecular weight ester alcohols such as. B. neopentyl glycol hydroxypivalate.
- Suitable polyols for preparing the polyaddition compounds A2) are also the customary polymeric polyether polyols, polyester polyols, polycarbonate polyols and / or polyacrylate polyols known from polyurethane chemistry, which usually have a number average molecular weight of 200 to 22,000, preferably 250 to 18,000, particularly preferably 250 to 12,000 .
- a broad overview of suitable polymeric polyols for preparing the polyaddition compounds A2) can be found, for example, in N. Adam et al. Polyurethanes. In: Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH Verlag GmbH & Co. KgaA; 2005.
- Suitable polyether polyols are, for example, those in DE 26 22 951 B, column 6, line 65 to column 7, line 26, EP-A 0 978 523 page 4, line 45 to page 5, line 14 or WO 201 1 / 069966, page 4, line 20 to page 5, line 23, provided that they correspond to the information given above with regard to functionality and molecular weight.
- polyether polyols are adducts of ethylene oxide and / or propylene oxide with 1,2-propanediol, 1,3-propanediol, glycerol, trimethylolpropane, ethylenediamine and / or pentaerythritol or those according to Angew. Chem. 72, 927 (1960) (https://doi.org/10.1002/ange.19600722402) polytetramethylene ether glycols obtainable by polymerization of tetrahydrofuran with number average molecular weights of 400 g / mol to 4000 g / mol.
- polyester polyols are, for example, those of the type mentioned in EP-A 0 978 523, page 5, lines 17 to 47 or EP-A 0 659 792, page 6, lines 32 to 45, provided they comply with the information given above with regard to functionality and Molecular weight correspond.
- Particularly preferred polyester polyols are condensation products of polyhydric alcohols, such as. B.
- Suitable polycarbonate polyols are in particular the known reaction products of dihydric alcohols, for example those as mentioned above in the list of polyhydric alcohols by way of example, with diaryl carbonates, such as. B. diphenyl carbonate, dimethyl carbonate or phosgene.
- Polycarbonate polyols which are also suitable are those which, in addition to carbonate structures, also contain ester groups.
- the polyester carbonate diols known per se such as those obtained, for example, according to the teaching of DE-AS 1 770 245 by reacting dihydric alcohols with lactones, such as, in particular, s-caprolactone, and then reacting the resulting polyester diols with diphenyl or dimethyl carbonate can be obtained.
- Suitable polyacrylate polyols are, for example, those of the type mentioned in WO 201 1/124710 page 10, line 32 to page 13, line 18, provided that they correspond to the information given above with regard to functionality and molecular weight.
- Particularly preferred polyacrylate polyols are polymers or copolymers of hydroxyalkyl esters of acrylic acid or methacrylic acid, such as. B. hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate or hydroxybutyl (meth) acrylate, optionally together with acrylic acid alkyl esters and / or methacrylic acid alkyl esters, such as. B.
- Suitable polyols are, for example, the known, by reaction of simple glycols, such as. B. diethylene glycol, triethylene glycol, 4,4'-dioxethoxy-diphenyl- dimethylmethane (adduct of 2 mol of ethylene oxide with bisphenol A) or hexanediol, polyacetal polyols obtainable with formaldehyde or by polycondensation of cyclic acetals, such as. B. trioxane, manufactured polyacetals.
- simple glycols such as. B. diethylene glycol, triethylene glycol, 4,4'-dioxethoxy-diphenyl- dimethylmethane (adduct of 2 mol of ethylene oxide with bisphenol A) or hexanediol, polyacetal polyols obtainable with formaldehyde or by polycondensation of cyclic acetals, such as. B. trioxane, manufactured polyacetals.
- polystyrene resin for preparing the polyaddition compounds A2) are, for example, those described in EP-A 0 689 556 and EP-A 0 937 1 10, e.g. B. by reacting epoxidized fatty acid esters with aliphatic or aromatic polyols with epoxy ring opening available special polyols as well as hydroxyl-containing polybutadienes.
- Suitable amines for preparing the polyaddition compounds A2) are, for example, simple aliphatic or cycloaliphatic monoamines, such as. B. methylamine, ethylamine, n-propylamine, isopropylamine, the isomeric butylamine, pentylamine, hexylamine and octylamine, n-dodecylamine, n-tetradecylamine, n-hexadecylamine, n- Octadecylamine, cyclohexylamine, the isomeric methylcyclohexylamine and aminomethylcyclohexane, secondary monoamines such as dimethylamine, diethylamine, dipropylamine, diisopropylamine, dibutylamine, diisobutylamine, bis (2-ethylhexyl) amine, N-methyl- and N-ethyl-cyclohexylamine and
- Suitable amines are also any aliphatic and cycloaliphatic amines with at least two primary and / or secondary bonded amino groups, such as.
- B 1,2-diaminoethane, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 1,2-diamino-2-methylpropane, 1,5-diaminopentane, 1,3-diamino-2, 2-dimethylpropane, 1,6-diaminohexane,
- Diaminoundecane 1, 12-diaminododecane, 1, 2-diaminocyclopentane, 1, 2-
- Suitable amines are also amino-functional polyalkylene glycols, such as. B. 1,2-bis (aminoethoxy) -ethane, 1,1-diamino-3,6,9-trioxaundecane, 1,13-diamino-4,7,10-trioxatride-can and in particular those under the trade name Jeffamine ® from Huntsman Corp.
- Commercially marketed amine-functionalized polyalkylene glycols with number average molecular weights up to 5000, preferably up to 2000, particularly preferably up to 1000.
- sterically hindered aliphatic diamines with two secondary amino groups for the preparation of the polyaddition compounds A2) can be used, such as. B.
- polyamines are also the polyamidoamines, polyimines and / or polyvinylamines known as crosslinking components for epoxy resins.
- amino alcohols such as. B. 2-aminoethanol, the isomeric aminopropanols and butanols, 3-amino-1,2-propanediol and 1,3-diamino-2-propanol, are suitable.
- the alcohols and / or amines mentioned are used either individually or as mixtures of at least two such alcohols and / or amines.
- the polyaddition compound A2) containing uretdione groups can be prepared by various methods, for example the processes known from the literature for the preparation of polyurethane compositions, as described, for example, in WO 99/1 1690 and WO 201 1/1 15669.
- further monomeric isocyanates of the above-mentioned type and / or oligomeric polyisocyanates preferably those with an isocyanurate, biuret, iminooxadazinedione, allophanate and / or urethane structure, can be used in an amount of up to 30% by weight, based on the total weight of all reactants (including the compounds A1 containing isocyanate-functional uretdione groups), alcohols and / or amines) can also be used.
- the reaction is preferably carried out in compliance with an equivalent ratio of isocyanate groups to isocyanate-reactive groups of 2: 1 to 0.5: 1, preferably from 1.5: 1 to 0.7: 1, particularly preferably from 1: 1 to 0.9 : 1 .
- the polyaddition compounds A2) are compounds which are obtained by reacting isocyanate-functional compounds A1) containing uretdione groups with at least difunctional polyols of the molecular weight range 62 to 22,000 and optionally monoalcohols are prepared while maintaining an equivalent ratio of isocyanate groups to isocyanate-reactive groups of 2: 1 to 0.5: 1.
- the reaction can be carried out without a solvent or in a suitable solvent which is inert towards isocyanate groups.
- Suitable solvents for the preparation of the polyaddition compounds A2) are in particular those which are inert towards the isocyanate groups of the compound A1), for example the known customary aprotic paint solvents such as.
- the reaction of the isocyanate-functional uretdione group-containing compounds A1) with the alcohols and / or amines to form the uretdione group-containing polyaddition compounds A2) can take place without catalysis.
- conventional catalysts known from polyurethane chemistry can also be used to accelerate the reaction. Examples are tert here.
- Amines such as B. triethylamine, tributylamine, dimethylbenzylamine, diethylbenzylamine, pyridine, methylpyridine, dicyclohexylmethylamine, dimethylcyclohexylamine, N, N, N ', N'-
- Tetramethylethylenediamine N, N, N ', N'-tetramethyl-1, 3-butanediamine, N, N, N', N'-tetramethyl-1, 6-hexanediamine, pentamethyldiethylenetriamine, N-methylpiperidine, N-dimethylaminoethylpiperidine, N, N'-dimethylpiperazine, N-methyl-N'-dimethylaminopiperazine, 1,8-diazabicyclo (5.4.0) undec-7-en, 1,2-dimethylimidazole, 2-methylimidazole, N, N-dimethylimidazole-ß- phenylethylamine, 1,4-diazabicyclo- (2,2,2) -octane, bis- (N, N-dimethylaminoethyl) adipate; Alkanolamine compounds, such as.
- B triethanolamine, triisopropanolamine, N-methyl- and N-ethyl-diethanolamine, dimethylaminoethanol, 2- (N, N- Dimethylaminoethoxy) ethanol, N, N ', N "-Tris- (dialkylaminoalkyl) hexahydrotriazines, for example N, N', N" -Tris- (dimethylaminopropyl) -s-hexahydrotriazine and / or
- Bis (dimethylaminoethyl) ether Metal salts such as B. inorganic and / or organic compounds of iron, lead, bismuth, zinc and / or tin in the usual oxidation states of the metal, for example iron (II) chloride, iron (III) chloride, bismuth (III) acetate, bismuth (III) -2-ethylhexanoate, bismuth (III) octoate, bismuth (III) neodecanoate, zinc chloride, zinc 2-ethyl caproate, tin (II) octoate, tin (II) ethyl caproate, tin (II) palmitate , Dibutyltin (IV) dilaurate (DBTL), dibutyldilauryltin mercaptide, or lead octoate; Amidines, e.g.
- B 2,3-dimethyl-3,4,5,6-tetrahydropyrimidine; Tetraalkylammonium hydroxides, such as. B. tetramethylammonium hydroxide; Alkali hydroxides, such as. B. sodium hydroxide and alkali metal alcoholates, such as. B. sodium methylate and potassium isopropylate, and alkali salts of long-chain fatty acids with 10 to 20 carbon atoms and optionally pendant OH groups.
- Tetraalkylammonium hydroxides such as. B. tetramethylammonium hydroxide
- Alkali hydroxides such as. B. sodium hydroxide and alkali metal alcoholates, such as. B. sodium methylate and potassium isopropylate, and alkali salts of long-chain fatty acids with 10 to 20 carbon atoms and optionally pendant OH groups.
- Preferred catalysts are tert. Amines, bismuth and tin compounds of the type mentioned.
- the polyaddition compounds A2) containing uretdione groups in solvent-free form have a free isocyanate group content of less than 5% by weight, preferably less than 2% by weight and particularly preferably less than 1, in the process according to the invention % By weight.
- Polyaddition compounds A2) free of isocyanate groups are very particularly preferred.
- component A) having uretdione groups is combined with a component B) having at least one hydroxyl and / or at least one thiol group as a reactant.
- the component B) is, for example, the compounds mentioned above as suitable alcohols for the preparation of the polyaddition compound A2), in particular at least difunctional polyols of the molecular weight range 62 to 22,000.
- Suitable hydroxy-functional components B) are preferably the simple polyhydric alcohols with 2 to 14 carbon atoms mentioned there, low molecular weight ether and ester alcohols and the customary polymeric polyether polyols, polyester polyols, polycarbonate polyols and / or polyacrylate polyols known from polyurethane chemistry.
- Suitable components B) are also compounds which have at least one thiol group per molecule.
- Suitable thiol-functional components B) are preferably polythiols, for example simple alkanethiols, such as.
- (mercaptomethyl) sulfide bis (mercaptomethyl) disulfide, bis (mercaptoethyl) sulfide, bis (mercapto-ethyl) disulfide, bis (mercaptopropyl) sulfide, bis (mercaptopropyl) disulfide, bis (mercaptomethyl-thio) methane, tris (mercaptomethylthio) methane ,
- Particularly preferred thio-functional components B) are polyether and polyester thiols of the type mentioned. 4-Mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 1,1,3,3-tetrakis (mercaptomethylthio) propane, 5, are very particularly preferred , 7-dimercaptomethyl-1, 1 1 -dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1, 1 1 -dimercapto-3,6,9-trithiaundecane, 4,8-dimercapto-methyl-1 , 1 1 -dimercapto-3,6,9-trithiaundecane, trimethylolpropane tris (2-mercaptoacetate), trimethylolpropane tris (3-mercaptopropionate), pentaerythritol tetrakis (2-mercaptoacetate) and pentaerythritol tetraki
- suitable components B) are also mercapto alcohols, such as. B. 2-mercaptoethanol, 3-mercaptopropanol, 1,3-dimercapto-2-propanol, 2,3-dimercaptopropanol or dithioerythritol.
- the at least one component A) having at least one uretdione group and the at least one component B) having at least one hydroxyl and / or at least one thiol group are used in such amounts that the Component A) 0.5 to 2.0, preferably 0.7 to 1.5, especially preferably 0.8 to 1.2, very particularly preferably exactly one hydroxyl and / or thiol group of component B) is omitted.
- At least one salt-like catalyst C) with an imidazolium and / or imidazolinium cation is used in the process according to the invention.
- catalysts C are known as ionic liquids of the imidazolium and imidazolinium types and are used, for example, as solvents in chemical synthesis. Processes for their production are described, for example, in Chem. Rev. 99, 8, 2071-2084 and WO 2005/070896.
- the catalysts C) are salt-like compounds containing a structural element of the general formulas (I) or (II)
- R 1 , R 2 , R 3 , R 4 , R 5 and R 6 independently represent identical or different radicals which are saturated or unsaturated, linear or branched, aliphatic, cycloaliphatic, araliphatic or aromatic organic radicals having 1 to 18 carbon atoms which are substituted or unsubstituted and / or have heteroatoms in the chain, the radicals also in combination with one another, optionally together with a further heteroatom, can form rings with 3 to 8 carbon atoms, which can optionally be further substituted,
- R 3 , R 4 , R 5 and R 6 can independently also represent hydrogen
- R 7 represents hydrogen or a carboxylate anion (COO).
- Preferred catalysts C) are salt-like compounds containing a structural element of the general formulas (I) or (II), in which
- R 1 and R 2 independently represent the same or different radicals which are saturated or unsaturated, linear or branched, aliphatic, cycloaliphatic, araliphatic or aromatic organic radicals with 1 to 12 carbon atoms, which are substituted or unsubstituted and / or heteroatoms in the Have chain,
- R 3 , R 4 , R 5 and R 6 represent hydrogen
- R 7 represents hydrogen or a carboxylate anion (COO).
- catalysts C) are salt-like compounds containing a structural element of the general formulas (I) or (II), in which
- R 1 and R 2 independently of one another represent identical or different radicals which are saturated or unsaturated, linear or branched, aliphatic organic radicals having 1 to 12 carbon atoms,
- R 3 , R 4 , R 5 and R 6 represent hydrogen
- R 7 represents hydrogen or a carboxylate anion (COO).
- Suitable catalysts of the general formula (I) are those which contain a 1,3-dimethylimidazolium, 1-methyl-3-ethylimidazolium, 1-methyl-3-propylimidazolium, 1-methyl-3-butylimidazolium, 1 -methyl-3-pentylimidazolium-, 1-methyl-3-hexylimidazolium-, 1-methyl-3-octylimidazolium-, 1-methyl-3-nonylimidazolium-, 1 -methyl-3-decylimidazolium-, 1-decyl-3 -methylimidazolium-, 1 -Methyl-3-benzylimidazolium-, 1 -Methyl-3- (3-phenylpropyl) imidazolium-, 1 -Ethyl-3-methylimidazolium (EMIM) -, 1-isopropyl-3-methylimidazolium-, 1 - Butyl-3
- Suitable catalysts of the general formula (II) are those which have a 1,3-dimethylimidazolinium, 1-ethyl-3-methylimidazolinium, 1-butyl-3- methylimidazolium- 1,3-bis- (2,6-diisopropylphenyl) imidazolinium- or 1,3-bis (2,4,6-trimethylphenyl) imidazolinium-1 - (1-adamantyl) -3- (2,4,6 -trimethylphenyl) imidazolinium-,
- the catalysts C) present in the compositions according to the invention contain any inorganic and / or organic anions, such as. B. halide, sulfate, hydroxysulfate, sulfite, nitrate, carbonate, hydrogen carbonate, aryl sulfonate, alkyl sulfonate, trifluoromethyl sulfonate, alkyl sulfate, phosphate, dialkyl phosphate, hexafluorophosphate, hexafluorophosphate, trifluoromethyl borate, Bis (trifluoromethylsulfonyl) imide, dicyanamide and / or carboxylate anions.
- the counterion to the imidazolium and imidazolinium cations can also be a carboxylate group (COO) which is bonded directly to the imidazolium cation as R 7 of the general formula (I), the catalyst C) in this case in the form of a zwitterionic Has structure.
- COO carboxylate group
- Suitable catalysts C) for the compositions according to the invention are, for example, 1,3-dimethylimidazolium chloride, 1,3-dimethylimidazolium-2-carboxylate,
- 1,3-Dimethylimidazolium dimethylphosphate 1-ethyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium bromide, 1-ethyl-3-methylimidazolium iodide, 1-ethyl-3-methylimidazolium nitrate, 1-ethyl-3-methylimidazolium, 1-ethyl-3-methylimidazolium 3-methylimidazolium methanesulphonate, 1-ethyl-3-methylimidazolium trifluoromethanesulphonate, 1-ethyl-3-methylimidazolium trifluoro (trifluoromethyl) borate, 1-ethyl-3-methylimidazolium hydrogen sulphate, 1-methyl-1-methyl-ethanesulphate 1-methyl-1-methyl-eimidazolium-1-methyl-1-methyl-eimidazolium Ethyl 3-methylimidazolium tetrafluoroborate,
- catalysts C) are imidazolium salts of the type mentioned with carboxylate anions, very particularly preferably 1,3-dimethylimidazolium-2-carboxylate, 1-ethyl-3-methylimidazolium-2-carboxylate, 1-ethyl-3-methylimidazolium acetate, 1 - Butyl 3-methylimidazolium-2-carboxylate and / or 1-butyl-3-methylimidazolium acetate.
- the catalysts C) come in the process according to the invention either individually or as mixtures of at least two such catalysts in an amount of 0.001 to 15% by weight, preferably 0.005 to 12% by weight, particularly preferably 0.01 to 10% by weight, based on the total weight of components A) and B), excluding any solvents, auxiliaries or additives present in these components.
- co-catalytically active compounds can also be used in the process according to the invention for controlling the selectivity of the uretdione reaction.
- organic zinc salts such as. B. zinc (II) stearate, zinc (II) n-octanoate, zinc (II) -2-ethyl-1-hexanoate, zinc (II) naphthenate or zinc (II) acetylacetonate, which are used individually or as mixtures of at least two such co-catalysts, if at all in an amount of 0.01 to 100 mol%, based on the amount of catalyst C).
- the preferred co-catalyst is zinc (II) acetylacetonate.
- the method according to the invention is outstandingly suitable for the production of polyurethane plastics and is used for this.
- the process according to the invention is preferably used for the production of coating compositions.
- compositions preferably coating agents, contain either at least one component A) having at least one uretdione group, at least one component B) having at least one thiol group and at least one catalyst C) with an imidazolium or imidazolinium structure as well optionally further auxiliaries and additives or containing at least one, at least one polyaddition compound A2) which, in solvent-free form, has a free isocyanate group content of less than 5% by weight, at least one component B containing at least one hydroxyl and / or thiol group ) and at least one catalyst C) with an imidazolium or imidazolinium structure and, if appropriate, further auxiliaries and additives, likewise a subject of the invention.
- the at least one polyaddition compound A2) in solvent-free form preferably has a content of free isocyanate groups of less than 2% by weight and particularly preferably less than 1% by weight. Polyaddition compounds A2) free of isocyanate groups are very particularly preferred.
- compositions according to the invention are cured, depending on the activity of the catalyst used, generally in the temperature range from 20 to 200 ° C., preferably from 60 to 180 ° C., particularly preferably from 70 to 170 ° C. and very particularly preferably from 80 to 160 ° C., preferably over a period of 1 minute up to 12 hours, preferably 10 minutes to 3 hours.
- the uretdione groups originally contained in component A) generally react completely to form allophanate groups and / or thioallophanate groups and, if appropriate, isocyanurate groups.
- Another object of the invention is the use of at least one composition according to the invention for the production of polyurethane plastics.
- the invention also provides the use of at least one composition according to the invention for the production of coating agents.
- any substrates can be used as substrates for the coatings formulated with the aid of the compositions according to the invention, such as, for. B. metal, wood, glass, stone, ceramic materials, concrete, hard and flexible plastics, textiles, leather and paper, which can optionally be hen verses with conventional primers before coating.
- coating agents comprising at least one composition according to the invention and a substrate coated with a coating agent according to the invention which is optionally cured under the action of heat.
- compositions formulated with the compositions according to the invention which optionally contain the usual auxiliaries and additives known to the person skilled in the art from paint technology, such as.
- the invention also relates to polyurethane plastics, preferably coatings, which have been obtained by using the coating agents described above.
- the NCO contents were determined titrimetrically in accordance with DIN EN ISO 1 1909: 2007-05.
- the residual monomer contents were measured according to DIN EN ISO 10283: 2007-1 1 by gas chromatography using an internal standard.
- compositions of the uretdione model compounds were determined by gel permeation chromatography based on DIN 55672-1: 2016-03 (gel permeation chromatography (GPC) - Part 1: tetrahydrofuran (THF) as eluent), with the change that with a flow rate of 0, 6 ml / min instead of 1.0 ml / min was worked.
- GPC gel permeation chromatography
- THF tetrahydrofuran
- the König pendulum damping was determined in accordance with DIN EN ISO 1522: 2007-04 on glass plates.
- uretdione byproducts formed during the curing of the compositions according to the invention were determined using protocone-decoupled 13 C-NMR spectra (recorded using CDCl3 as solvent on a Bruker DPX-400 device).
- the individual structural elements show the following chemical shifts (in ppm): uretdione: 157.1; Isocyanurate: 148.4; Allophanate: 155.7 and 153.8.
- the solvent resistance was determined using xylene as a typical paint solvent.
- xylene as a typical paint solvent.
- a small amount of the solvent was placed in a test tube and a cotton swab was attached to the opening so that an atmosphere saturated with xylene was created inside the test tube.
- HDI-UD1 HDI uretdione model connection
- HDI-UD2 polvuretdione crosslinker
- PDI 1,5-diisocyanatopentane
- HDI 1,6-diisocyanatohexane
- HDI-UD2 HDI polyurethane crosslinker
- HDI-UD2 the HDI polyurethane crosslinker
- a coating agent 148.6 g (0.191 eq) of the HDI polyurethane crosslinker (HDI-UD2) corresponding to an equivalent ratio of thiol groups to uretdione groups of 1.1: 1 to form a coating agent and after adding 2.0 g (12.1 mmol, 1.0%) 1-ethyl-3-methylimidazolium acetate as a catalyst was applied to a degreased glass plate using a paint dumbbell in an application layer thickness of 150 ⁇ m. After flashing off at room temperature for 15 minutes, the paint was cured within 30 minutes at 100.degree.
- HDI-UD2 the HDI polyurethane crosslinker
- a smooth, colorless-transparent coating was obtained which had a pendulum damping of 160 s and a xylene resistance of 1-2.
Landscapes
- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19185846 | 2019-07-11 | ||
| PCT/EP2020/068926 WO2021004980A1 (de) | 2019-07-11 | 2020-07-06 | Verfahren zur herstellung von allophanat- und/oder thioallophanatgruppen enthaltenden verbindungen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3997141A1 true EP3997141A1 (de) | 2022-05-18 |
Family
ID=67437704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20737421.6A Pending EP3997141A1 (de) | 2019-07-11 | 2020-07-06 | Verfahren zur herstellung von allophanat- und/oder thioallophanatgruppen enthaltenden verbindungen |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20220251280A1 (de) |
| EP (1) | EP3997141A1 (de) |
| CN (1) | CN114080409A (de) |
| WO (1) | WO2021004980A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3916032A1 (de) | 2020-05-29 | 2021-12-01 | Covestro Deutschland AG | Bei niedrigen temperaturen vernetzende uretdiongruppen enthaltende zusammensetzungen |
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-
2020
- 2020-07-06 US US17/624,763 patent/US20220251280A1/en not_active Abandoned
- 2020-07-06 WO PCT/EP2020/068926 patent/WO2021004980A1/de not_active Ceased
- 2020-07-06 EP EP20737421.6A patent/EP3997141A1/de active Pending
- 2020-07-06 CN CN202080050382.2A patent/CN114080409A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021004980A1 (de) | 2021-01-14 |
| US20220251280A1 (en) | 2022-08-11 |
| CN114080409A (zh) | 2022-02-22 |
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