EP2904028A1 - Polyisocyanates hydrophiles stables au stockage - Google Patents

Polyisocyanates hydrophiles stables au stockage

Info

Publication number
EP2904028A1
EP2904028A1 EP13752624.0A EP13752624A EP2904028A1 EP 2904028 A1 EP2904028 A1 EP 2904028A1 EP 13752624 A EP13752624 A EP 13752624A EP 2904028 A1 EP2904028 A1 EP 2904028A1
Authority
EP
European Patent Office
Prior art keywords
polyisocyanate
water
group
composition
uretdione
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.)
Withdrawn
Application number
EP13752624.0A
Other languages
German (de)
English (en)
Inventor
Emmanouil Spyrou
Evelyn Albrecht
Iris Brückner
Annegret Lilienthal
Wiebke STACHE
Judith SCHODER
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.)
Evonik Operations GmbH
Original Assignee
Evonik Degussa GmbH
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 Evonik Degussa GmbH filed Critical Evonik Degussa GmbH
Publication of EP2904028A1 publication Critical patent/EP2904028A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C08G18/7875—Nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring
    • C08G18/7887—Nitrogen containing heterocyclic rings having at least one nitrogen atom in the 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
    • 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
    • C08G18/703—Isocyanates or isothiocyanates transformed in a latent form by physical means
    • C08G18/705—Dispersions of isocyanates or isothiocyanates in a liquid medium
    • C08G18/706—Dispersions of isocyanates or isothiocyanates in a liquid medium the liquid medium being water
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D229/00—Heterocyclic compounds containing rings of less than five members having two nitrogen atoms as the only ring hetero atoms
    • 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/2805—Compounds having only one group containing active hydrogen
    • C08G18/2815—Monohydroxy compounds
    • C08G18/282—Alkanols, cycloalkanols or arylalkanols including terpenealcohols
    • 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
    • C08G18/2805—Compounds having only one group containing active hydrogen
    • C08G18/2815—Monohydroxy compounds
    • C08G18/283—Compounds containing ether groups, e.g. oxyalkylated monohydroxy 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
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3203—Polyhydroxy compounds
    • C08G18/3206—Polyhydroxy compounds aliphatic
    • 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
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3225—Polyamines
    • C08G18/3228—Polyamines 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
    • C08G18/28—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
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3855—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur
    • C08G18/3857—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur having nitrogen in addition to sulfur
    • 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
    • C08L75/08—Polyurethanes from polyethers
    • 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
    • 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
    • C09D175/08—Polyurethanes from polyethers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/08—Polyurethanes from polyethers
    • 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
    • C08G2190/00—Compositions for sealing or packing joints

Definitions

  • the invention relates to novel water-dispersible hydrophilic polyisocyanates and polyisocyanate mixtures, a process for their preparation, compositions comprising the hydrophilic polyisocyanates according to the invention and their use as starting components in the production of polyurethane plastics,
  • crosslinker for water-soluble or -dispersible paint, adhesive or sealant binders or binder components with isocyanate-reactive groups.
  • Dispersion adhesives use. They are used for crosslinking aqueous dispersions in the textile or leather finish or formaldehyde-free textile printing inks and are also suitable, for example, as an aid for wet solidification of paper, such as. As disclosed in EP 0 959 087.
  • EP-A 0 443 138, EP-A 0 510 438 and EP-A 0 548 669 describe polyisocyanate mixtures which are chemically bonded
  • EP 0 703 255 B2 describes ionically hydrophilized water-emulsifiable
  • Polyisocyanates which have as reaction products from the reaction with 2-hydroxyethanesulfonic acid or 3-hydroxypropanesulfonic acid as emulsifiers.
  • hydrophilicizing agents also have a number of disadvantages.
  • hydroxypropanesulfonic acid is in equilibrium with its anhydride, the carcinogenic 1, 3-propane sultone. It can therefore be handled, especially on an industrial scale, exclusively in the form of aqueous solutions and is therefore fundamentally unsuitable as a synthesis component for the preparation of modified polyisocyanates.
  • EP 0 703 255 B2 makes no statement about the stability and the processing window ("pot life") of emulsions prepared from the hydrophilic polyisocyanates.
  • EP 1 287 052 B1 discloses modified polyisocyanates obtained by reacting polyisocyanates with 2- (cyclohexylamino) ethanesulfonic acid and / or
  • Neutralizing agent are available, storage-stable, bright products are obtained.
  • storage stability it is only disclosed that the aqueous emulsions obtainable from the hydrophilic modified polyisocyanates were still completely stable after a service life of 5 hours. They showed neither visible C0 2 evolution nor precipitation or sediment. However, no statement is made about the actual NCO content and the reactivity of the system after 5 hours.
  • nonionic, hydrophilic modified by means of polyethers Polyisocyanates used The preparation of such water-dispersible
  • Polyisocyanates are discussed in detail, for example, in EP 0 959 087, EP 0 206 059, EP 0 540 985. Despite their wide distribution for the most diverse
  • polyisocyanates modified with nonionic polyethers have a number of principal disadvantages. They can often be homogeneously incorporated into aqueous media during dispersion only by applying considerable shear forces.
  • the high polyether content required in particular for use as crosslinking agents in aqueous 2K PU paints for sufficient dispersibility also gives the coatings obtained a permanent hydrophilicity.
  • the polyisocyanates modified in this way have too little stability ("pot life") in aqueous emulsion, during which they retain their full NCO activity and reactivity, which also limits the period of time within which the hydrophilic polyisocyanates can be processed.
  • hydrophilic polyisocyanates which are both easily incorporated in water and have a long pot life are desirable.
  • the object of the present invention was therefore to provide new water-dispersible polyisocyanates which can be used without the use of external emulsifiers or the application of high shear forces and contain no external blocking agents.
  • these new polyisocyanates should yield aqueous emulsions or dispersions with long pot life and pot life, while maintaining full reactivity of the isocyanate groups over the entire service life
  • the life of a dispersion or emulsion containing no catalyst should be at least 8 weeks , preferably at least 12 Weeks, be at 50 ° C, while the latent NCO content must not fall more than 30%, based on the initial value.
  • the present invention relates to water-dispersible hydrophilic
  • Uretdione-containing polyisocyanates and polyisocyanate mixtures a process for their preparation, compositions comprising the hydrophilic polyisocyanates according to the invention and their use as starting components in the production of polyurethane plastics, especially as crosslinkers for water-soluble or -dispersible paint binders or binder components with opposite
  • polyisocyanate is synonymous in the following synonymous for mixtures of different polyisocyanates.
  • water-dispersible in the sense of the invention is meant that the hydrophilic water-dispersible polyisocyanates form a fluid in contact with water within 24 hours, which does not detect any solid particles with the eye without optical aids.
  • 100 mg of the polymer in the form of a 100 ⁇ m thick film are placed in 100 ml of water (20 ° C.) and shaken on a commercial shaking table for 24 hours If, after shaking, no solid particles are recognizable, but the fluid has turbidity, if the polymer is water-dispersible, without turbidity it is referred to as "water-soluble".
  • the process according to the invention for the preparation of hydrophilic polyisocyanates C comprises reacting a uretdione-bearing prepolymer A with at least one emulsifier B, wherein the emulsifier B comprises at least one ionogenic group which in the case of an acidic ionic group in water has a pK a value> 8, preferably > 10 and very particularly preferably> 12 at room temperature or in the case of a basic ionic group has a pK b value of> 8, preferably> 10 and very particularly preferably> 12 at room temperature.
  • Uretdione group-containing polyisocyanates are well known and are well known.
  • a prepolymer is prepared, which reacts with 30 - 70 equivalent% of diamines or diols, then hydrophilized and then dispersed.
  • Polyisocyanate is the uretdione of isophorone diisocyanate, optionally in mixtures with isophorone diisocyanate and its trimer used, wherein in this 1 K system on both capped in the uretdione isocyanate groups each have a hydroxyl group, wherein the hydroxyl groups are added during the dispersion or thereafter.
  • the hydrophylated polyisocyanate is characterized by a very limited stability in water.
  • polyurethane dispersions are claimed which has both uretdione groups and isocyanate-reactive groups in the same molecule. This will in addition to networking between the
  • Polyurethane molecules also a crosslinking in the polymer, which is referred to as "intra-penetrating network.” Also, these splitting-free aqueous polyurethane hardener are very limited shelf life in water.
  • the reaction of isocyanates to uretdiones is preferably carried out in the presence of soluble dimerization catalysts such.
  • soluble dimerization catalysts such as dialkylaminopyridines, trialkylphosphines, Phosphorigklaretriamiden or imidazoles.
  • the reaction is optionally carried out in solvents, but preferably in the absence of solvents. It can be stopped by the addition of catalyst poisons upon reaching a desired conversion, but this is not absolutely necessary. Excess monomeric isocyanate is subsequently separated by short path evaporation. If the catalyst is volatile enough, the reaction mixture can be freed from the catalyst in the course of the monomer separation. The addition of catalyst poisons can be dispensed with in this case.
  • isocyanates are suitable for the preparation of polyisocyanates containing uretdione groups.
  • Suitable isocyanates are preferably selected from the group consisting of isophorone diisocyanate (IPDI),
  • 2,4,4-trimethylhexamethylene diisocyanate (2,4,4-TMDI), norbornane diisocyanate (NBDI), methylene diphenyl diisocyanate (MDI), toluidine diisocyanate (TDI),
  • Tetramethylxylylene diisocyanate TXDI
  • the isocyanate is IPDI and / or 4, 4'-H 12 MDI and / or HDI.
  • the reaction of these uretdione-bearing polyisocyanates to uretdione-containing prepolymers A involves the reaction of the free NCO groups with hydroxyl-containing monomeric, oligomeric and / or polymeric compounds.
  • the hydroxyl-containing compound is selected from the group consisting of polyesters, polythioethers, polyethers, polycaprolactams,
  • Low molecular weight di-, tri- and / or tetra-alcohols are suitable as chain extenders.
  • Monoamines and / or monoalcohols can be used as chain terminators, for example as described in EP 669353, EP 669354, DE 3030572, EP 639598 or EP 803524.
  • polyesters having an OH number of 30 to 250 mg KOH / g and an average molecular weight of 300 to 6000 g / mol or monomeric dialcohols, such as.
  • ethylene glycol propanediol (1, 2) and propanediol (1, 3), 2,2-Dimethylpropandiol- (1, 3), butanediol (1, 4), hexanediol (1, 6), 2- Methylpentanediol-1, 5, 2,2,4-trimethylhexanediol (1,6), 2,4,4-trimethylhexanediol (1,6), heptanediol (1,7), dodecanediol (1,12), Octa-decene-9,10-diol- (1, 12), thiodiglycol, octadecanediol (1,18), 2,4-dimethyl-2-propylheptanediol (1,18), 2,
  • the NCO content is in the range of 1, 5 to 14 wt .-%, based on the total weight of the prepolymer.
  • the prepolymer A may also have isocyanurate, biuret, allophanate, urethane and / or urea structures.
  • Emulsifier B comprises one or more ionogenic groups, preferably an ionogenic group.
  • an ionogenic group is selected from the group consisting of sulfonates and phosphates.
  • the ionic group of the emulsifier B is a predominantly neutral in water radical.
  • an acidic ionic group it has a pK a value> 8 at room temperature in water or in the case of a basic ionic group a pK b value of> 8 at room temperature.
  • the emulsifier B may have one or more OH, NH or NH 2 groups or other isocyanate-reactive groups.
  • the number average molecular weight (Mn) is preferably ⁇ 1000 and very particularly preferably ⁇ 500.
  • the emulsifier B is at least one sulfonic acid selected from the group consisting of hydroxyalkylsulfonic acids, hydroxypolyethersulfonic acids,
  • Aminoalkylsulfonic acids and aminopolyethersulfonic acids are preferred.
  • Hydroxyalkylsulfonic acids are 2-hydroxyethanesulfonic acids and 3-hydroxypropanesulfonic acids.
  • Preferred aminoalkylsulfonic acids are 2- (cyclohexylamino) ethanesulfonic acid and 3- (cyclohexylamino) -propanesulfonic acid.
  • Particularly preferred emulsifiers B are amino-containing sulfonates.
  • the emulsifier B is at least one phosphate.
  • Suitable neutralizing agents for the acid group-containing ionogenic groups of the emulsifier B are selected from the group consisting of alkali metal hydroxides and alkaline earth metal hydroxides.
  • the uretdione-containing prepolymer A and the emulsifier B are mixed with or without solvent and then reacted at suitable temperatures.
  • the solvent is selected from the group consisting of water, acetone,
  • Dimethylformamide, N-methylpyrrolidone, ethyl acetate, tetrahydrofuran, dioxane is water.
  • Suitable solvents are, for example, the known conventional lacquer solvents, such as. B. methoxypropyl acetate, butyl acetate,
  • hydrocarbon-containing aromatic compounds Solvesso R from Exxon Mobile
  • xylene hydrocarbon-containing aromatic compounds
  • the ratio of free NCO groups in A and NCO-reactive groups in B before their reaction is preferably 2: 1 to 1: 2, more preferably 1, 1: 1 to 1: 1, 1.
  • the free NCO content of the hydrophilic polyisocyanate C is preferably ⁇ 2%, particularly preferably ⁇ 1%.
  • the invention relates to reactive compositions comprising the product C from the reaction of A and B.
  • the product C is a hydrophilic polyisocyanate, which is also called hardener C below.
  • the reactive composition of the invention is an aqueous composition.
  • the hydrophilic polyisocyanate C can with or without auxiliary solvent according to known
  • compositions of the invention are stable for at least 8 weeks, preferably at least 12 weeks, at 50 ° C, d. H. the hydrophilic polyisocyanate C also shows an after 8 or 12 weeks at 50 ° C.
  • polyisocyanates prepared by the process according to the invention before emulsification other non-hydrophilicized polyisocyanates, in particular paint polyisocyanates such as IPDI, HDI, TMDI, H 12 MDI, and their derivatives, such as trimers, allophanates, biurets, etc., are added.
  • paint polyisocyanates such as IPDI, HDI, TMDI, H 12 MDI, and their derivatives, such as trimers, allophanates, biurets, etc.
  • composition of the invention may preferably further comprise
  • Hydroxyl-containing components D which are water-soluble, emulsifiable in water or dispersible in water are known in the literature. These may be monomeric, oligomeric and / or polymeric compounds for component D. Polymeric compounds are preferably selected from the group consisting of polyethers, polyesters,
  • Polycarbonates, polyalkyd resins, polyacrylates, polyurethanes and polycaprolactones may be modified with the aid of external or internal emulsifiers so that they become water-soluble, emulsifiable or dispersible.
  • Monomeric and oligomeric compounds are preferably selected from the group of monomeric diols, triols, tetrols, diamines, triamines, tetramines.
  • Suitable internal emulsifiers for component D are preferably ionogenic or nonionic building blocks. Ionogenic building blocks consist of acids or bases which additionally contain reactive groups and can be converted with the aid of monomeric bases (eg.
  • Triethylamine or acids (eg, acetic acid) can be neutralized.
  • Nonionic emulsifiers generally contain longer or shorter polyether units.
  • Products D are known from the literature and marketable and z.
  • One possibility of preparing resins D with internal emulsifiers is the reaction of suitable alcohol components with a mixture of dimethylolpropionic acid and a di- or polyisocyanate at temperatures of 40-100 ° C., preferably in an organic solvent such as acetone, ethyl acetate, dimethylformamide, N-methylpyrrolidone.
  • the organic solvent is optionally removed.
  • the neutralizing agent for. For example, triethylamine, added and the reaction product introduced into water.
  • the usual additives such as leveling agents, for.
  • leveling agents for.
  • polysilicones or acrylates light stabilizers, for.
  • sterically hindered amines, or other auxiliaries such as.
  • sterically hindered amines such as.
  • z. Stabilizers
  • Degassing, emulsifying and dispersing additives in a total amount of from 0.05 to 5% by weight, based on the total weight of the composition.
  • Fillers and pigments such as Titanium dioxide may be added in an amount of up to 50% by weight of the total composition. Preferred are on the
  • Paint sector customary auxiliaries and additives such.
  • Organic solvents are suitable as excipient
  • Composition may be added, for. Ethyl acetate, butyl acetate,
  • solvents such as propylene glycol diacetate, diethylene glycol dimethyl ether, dipropylene glycol dimethyl ether, diethylene glycol ethyl ether acetate, diethylene glycol butyl acetate, N-methylpyrrolidone and N-methylcaprolactam or any mixtures of such solvents.
  • solvents are preferably used only as an auxiliary solvent and make in comparison with the main solvent water only smaller proportions.
  • Volume ratio of water: Auxiliary solvent is preferably greater than 2: 1 and is preferably in the range of 100: 1 to 10: 1.
  • the aqueous uretdione-containing curing agent C is mixed with the aqueous resin D for the preparation of the composition according to the invention and admixed with other auxiliary and addition components E, if appropriate.
  • auxiliary and addition components E if appropriate.
  • composition one or more of the non-aqueous components C and / or D and optionally E in one of the aqueous components C and / or D and optionally E given.
  • composition of the invention all non-aqueous components C, D and optionally E in succession or simultaneously in water.
  • the composition according to the invention is stable for at least 8 weeks, preferably after 12 weeks, at 50 ° C., ie it also exhibits substantially the same reactivity after 8 and 12 weeks at 50 ° C. as the starting mixture.
  • composition according to the invention may also comprise catalysts or catalyst mixtures F (hereinafter catalysts F).
  • Catalysts F are added to the composition to increase the reactivity of uretdione groups and have become known primarily for powder coatings.
  • Suitable catalysts F are preferably F1 and / or F2,
  • F1 is selected from the group consisting of metal acetylacetonates, preferably zinc acetylacetonates, optionally in combination with tetraalkylammonium halides or tetraalkylphosphonium halides and acid scavengers
  • Components e.g. As epoxides, carbodiimides, aziridines, oxazolines or
  • F 2 is selected from the group consisting of tetralkylammonium hydroxides, Tetralkylphosphonium hydroxides and carboxylates, optionally in
  • F 2 is a tetralkylammonium carboxylate, more preferably a tetralkylammonium benzoate.
  • Carboxylic acids eg. As oxalic acid, are added to the reaction mixture. It is also possible to use customary catalysts known from polyurethane chemistry, for example tert. Amines such as triethylamine, pyridine, methylpyridine,
  • Pentamethyldiethylenetriamine, ⁇ , ⁇ -dimethylaminocyclohexane, N, N'-dimethylpiperazine or metal salts such as iron (II) chloride, aluminum tri (ethylacetoacetate), zinc chloride, zinc (II) n-octanoate, zinc (II) 2-ethyl 1-hexanoate, zinc (II) 2-ethylcaproate, zinc (II) stearate, zinc (II) naphthenate, zinc (II) acetylacetonate, tin (II) n-octanoate, tin (II) -2- ethyl 1-hexanoate, tin (II) ethyl caproate, stannous laurate, stannous palmitate, dibutyltin (IV) oxide, dibutyltin (IV) dichloride, dibutyltin (IV) diacetate
  • Dibutyltin (IV) dilaurate, dioctyltin (IV) diacetate, molybdenum glycolate or any mixtures of such catalysts are dibutyltin (IV) dilaurate, dioctyltin (IV) diacetate, molybdenum glycolate or any mixtures of such catalysts.
  • the catalysts F can be used in the process according to the invention with a concentration in the range of 0.001 to 2 wt .-%, preferably in the range of 0.005 to 0.5 wt .-%, based on the total weight of the reactants.
  • the combination of C, D and F and optionally E has an increased reactivity in comparison to the variant without F.
  • the reactivity and the storage stability depend on the composition and the concentration of the component F.
  • Storage stability is at least 8 weeks, preferably at least 12 weeks, at room temperature (20 ° C).
  • the lower storage stability compared to catalyst-free compositions results from the fact that the catalyst increases the reactivity and thus reduces the storage stability. Nevertheless, the storage stability of the catalyst composition according to the invention is still higher than of prior art comparative products which also contain a catalyst.
  • Another object of the invention is the use of the polyisocyanates according to the invention as starting components in the production of polyurethane plastics, in particular as crosslinkers for water-soluble or dispersible Paint binders or paint binder components in the manufacture of coatings using aqueous coating compositions based on such binders or binder components.
  • the invention finally also relates to the use of these polyisocyanates as starting components in the preparation of water-dispersible or dispersed in water present blocked polyisocyanates.
  • the polyisocyanates according to the invention are valuable starting materials for the production of polyurethane plastics by the isocyanate polyaddition process.
  • the invention therefore also coatings, adhesives and
  • Sealants prepared using a composition comprising at least one polyisocyanate according to the invention and a method for the same
  • the at least one polyisocyanate is by means of
  • the method of making a coating, adhesive or sealant comprises applying a composition comprising at least one
  • the applied composition may comprise other components such as those mentioned above.
  • the curing and drying of the applied composition is preferred at temperatures between 80 ° C and 240 ° C in a time between 30 seconds and one week carried out.
  • the curing and drying is particularly preferably carried out at 120-200 ° C. in a time of 5 minutes to 1 hour.
  • the coatings according to the invention have
  • any substrates come into consideration, such as. As metal, wood, glass, stone, ceramic materials, concrete, hard and flexible plastics, textiles, leather and paper, which may optionally be provided with conventional primers prior to application.
  • compositions of the invention are excellent as crosslinkers for aqueous dispersion adhesives, leather and textile coatings or textile printing pastes, as paper auxiliaries, which are free of organically bonded halogens (AOX-free), or Also as an additive for mineral building materials, such as concrete or mortar compounds.
  • AOX-free organically bonded halogens
  • Cited documents their contents should fully belong to the disclosure of the present invention.
  • this aqueous dispersion had a latent NCO content of 3.0% and, after 8 weeks at 50 ° C., a latent NCO content of 1.26%.
  • the hydrophilization of uretdione-containing hardeners with polyethers thus does not give a storage-stable aqueous dispersion.
  • IPDI uretdione (see example c1) were dissolved in 180 ml of acetone and admixed with 0.3 g of dibutyltin dilaurate (Aldrich). 1 12.4 g of dimethylaminopropylamine (DMAPA,
  • Aminoalkylamines thus gives no storage-stable aqueous dispersion.
  • IPDI uretdione from preparation c1 was dissolved with 95.5 g of trimethylolpropane (Aldrich) and 0.23 g of DBTL (dibutyltin dilaurate, Aldrich) in 1.4 l of acetone. After stirring for one hour under reflux (free NCO content: 3.64%), 103 g of butanol were added and heating was continued for a further 1.5 h under reflux, after which the free NCO- Salary was 1.49%.
  • Vestamin A95 sodium hydroxide neutralized amine-containing alkyl sulfonate, 50% in water, Evonik
  • Rotary evaporator removed and then filtered the product with a 50 ⁇ filter.
  • the latent NCO content was 4.5%, the solids about 27% and the viscosity 163 mPas.
  • Dimethylolpropionic acid (Aldrich) was dissolved with 0.5 g DBTL (dibutyltin dilaurate, Aldrich) in 1.1 L acetone. After 12 hours under reflux, was cooled and 57 g of 1, 4-butanediol (Aldrich), 1 .363 g of oxyester T1 136 (liquid hydroxyl polyester with OHZ: 1 12, Evonik), 169 g of trimethylolpropane (Aldrich) and 0.8 g DBTL (dibutyltin dilaurate, Aldrich). After a further 18 h stirring under reflux, the NCO content had dropped to 0.1%. The acid number was 27 and the OH number 82 in each case based on the solids.
  • Hardener C (latent NCO content 4.9%) was stored at 50 ° C. for eight weeks. The stored variant is henceforth abbreviated as C (g). Hardener C (g) showed a latent NCO content of 4.6%. e2) Storage of the mixtures: 70.4 g C + 29.6 g D
  • Catalyzed systems have a higher reactivity because of the catalyst than the non-catalyzed systems described in the o.a. Examples were tested. They are therefore not as stable in storage, but harden already traveled at significantly lower temperatures, which is cheaper for some applications. Therefore, the storage stability after curing for 30 minutes at 130 ° C was measured
  • the mixture f1) was admixed with 3.62 g of a 50% tetraethylammonium benzoate solution (catalyst, Sachem) and 4.8 g of Polypox IE700 8W (activator, hydrophylated bisphenol A diepoxide, UPPC, Dow) curing (30 min ° C) f1 * f2
  • the methyl ethyl ketone resistance test is carried out by rubbing with a Methyl ethyl ketone impregnated cotton ball with 1 kg of support until the dissolution of the layer. Double strokes (DR) are counted. A value of> 100 means that with more than 100 double strokes, no resolution of the layer could be observed.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Dispersion Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Paints Or Removers (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Sealing Material Composition (AREA)

Abstract

L'invention concerne de nouveaux polyisocyanates et mélanges de polyisocyanates hydrophiles hydrodispersables, leur procédé de préparation, des compositions contenant les polyisocyanates hydrophiles selon la présente invention et leur utilisation en tant que composant de départ pour la préparation de matières plastiques polyuréthane, en particulier en tant qu'agent de réticulation pour des liants ou constituants de liants hydrosolubles ou hydrodispersables pour peintures, adhésifs ou agents d'étanchéité, contenant des groupes capables de réagir avec des groupes isocyanate.
EP13752624.0A 2012-10-04 2013-08-20 Polyisocyanates hydrophiles stables au stockage Withdrawn EP2904028A1 (fr)

Applications Claiming Priority (2)

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DE102012218081.8A DE102012218081A1 (de) 2012-10-04 2012-10-04 Neuartige hydrophile Polyisocyanate mit verbesserter Lagerstabilität
PCT/EP2013/067330 WO2014053269A1 (fr) 2012-10-04 2013-08-20 Polyisocyanates hydrophiles stables au stockage

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WO (1) WO2014053269A1 (fr)

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EP3560974A1 (fr) * 2018-04-25 2019-10-30 Covestro Deutschland AG Polyisocyanates hydrophilisés ioniques, teneur en humidité
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WO2021004980A1 (fr) 2019-07-11 2021-01-14 Covestro Intellectual Property Gmbh & Co. Kg Procédé de fabrication de composés contenant des groupes allophanate et/ou thioallophanate
EP3872108A1 (fr) 2020-02-28 2021-09-01 Covestro Intellectual Property GmbH & Co. KG Compositions contenant des groupes uretdione
EP3916032A1 (fr) 2020-05-29 2021-12-01 Covestro Deutschland AG Compositions à réticulation à basses températures contenant des groupes urétdione
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DE102012218081A1 (de) 2014-04-10
US20170349693A1 (en) 2017-12-07
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US20150232609A1 (en) 2015-08-20
JP2015533189A (ja) 2015-11-19

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