Classifications

• • C09D7/1233—
• • 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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/63—Additives non-macromolecular organic
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
  • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
  • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
  • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
  • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
  • B05B15/557—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids the cleaning fluid being a mixture of gas and liquid
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
  • B08B3/04—Cleaning involving contact with liquid
  • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
• • 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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/20—Diluents or solvents
• • 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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/71—Paint detackifiers or coagulants, e.g. for the treatment of oversprays in paint spraying installations
• • 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
  • C09D9/00—Chemical paint or ink removers
  • C09D9/005—Chemical paint or ink removers containing organic solvents

Definitions

• the invention relates to a non-aqueous solvent composition and its use as barrier liquid (separation liquid) within a coating installation of an industrial mass production coating line for the application of water-borne two-component polyurethane coatings.
• EP 1 543 883 A1 discloses an arrangement of valves which can be used within a coating installation for the spray application of water-borne two-component polyurethane coatings.
• the coating installation can be used for the spray application of water-borne two-component polyurethane coatings on an industrial scale, i.e. it may be used as a coating installation in an industrial mass production coating line for the spray application of water-borne two-component polyurethane coatings.
• Water-borne two-component polyurethane coating compositions comprise two components which are kept separately from each other during storage: (i) an aqueous base component comprising hydroxyl-functional binder resin (for brevity herein also called “aqueous base component”) and (ii) a non-aqueous hardener component comprising polyisocyanate crosslinker (for brevity herein also called “non-aqueous hardener component”).
• aqueous base component comprising hydroxyl-functional binder resin
• non-aqueous hardener component comprising polyisocyanate crosslinker
• each circulating line is connected with the mixer, in particular a conventional static mixer such as a Kenics mixer.
• the connection between each circulating line and the mixer is made by a stub (feedtube, feedpipe) for each component.
• the connection includes parts like pumps and valves, wherein, typically, the valve closest to the mixer is the release valve (dispensing valve, dosage valve) for the respective component.
• the release valves are typically multi-port valves.
• the mixing with the static mixer allows a continuous mixing of the aqueous base component and the non-aqueous hardener component shortly before the spray application of the so prepared water-borne two-component polyurethane coating composition.
• the water-borne two-component polyurethane coating composition leaving the exit of the static mixer is fed to the spray-application devices.
• coating installation of an industrial mass production coating line for the spray-application of water-borne two-component polyurethane coatings refers to the entire coating installation comprising, among others, storage tanks and circulation lines for the two components, pumps for feeding the two components, a mixer for mixing the two components, valves including release valves for the two components, one or more spray-application devices and any connecting pipework.
• an industrial mass production coating line for the spray-application of water-borne two-component polyurethane coatings where not only one, but a number of different, for example, differently colored water-borne two-component polyurethane coatings are spray-applied, basically the same applies.
• aqueous base component there is not only one aqueous base component, but a number of different aqueous base components each of which having an own storage tank, circulation line etc. Similar applies in case there are more than one non-aqueous hardener components, although typically there is only one non-aqueous hardener component.
• Industrial mass production coating processes are interrupted from time to time. Such interruptions may happen unintentionally or deliberately and they may take a shorter or longer period of time; examples of longer interruptions include production stops due to technical malfunction, shortage of coating material or of substrates to be coated, retrofitting, holiday, weekend and nonworking shifts.
• downtimes or production stops require the installation downstream of the afore-mentioned release valves (for brevity also called “downstream installation”) to be rinsed in order to remove coating material and to prevent the formation of lumps or incrustations in the downstream installation.
• Said downstream installation includes the static mixer, the spray-application devices, any possibly present valves and any connecting pipe work.
• the rinsing is automatically performed in mass-production coating lines for the application of water-borne two-component polyurethane coatings.
• An aqueous cleansing composition is typically used as rinsing medium, which is generally used in combination with pulse air to remove coating material from the downstream installation.
• a barrier liquid in the form of a non-aqueous solvent composition is then filled into the rinsed downstream installation so as to block access of the non-aqueous hardener component to the downstream installation and to prevent contact between non-aqueous hardener component and traces of water. Without such barrier liquid there is the risk of an unwanted formation of difficult-to-remove urea lumps within the downstream installation.
• the barrier liquid may be filled into the downstream installation so as to entirely fill the downstream installation or to fill at least some space directly downstream of the non-aqueous hardener component release valve, for example, the connection between said valve and the entrance of the mixer.
• a non-aqueous barrier liquid in the form of a mixture of an N-alkyl pyrrolidone with an alcohol and an ester has been commercialized as “Thinner/ECO Sperrmedium” by the applicant's German subsidiary DuPont Performance Coatings GmbH.
• the invention is directed to a non-aqueous solvent composition
• a non-aqueous solvent composition comprising
• the applicant has found an improved barrier liquid in the form of the non-aqueous solvent composition disclosed in the preceding paragraph.
• the barrier liquid comprises ⁇ -butyrolactone and, if any, at best a small amount of N-alkyl pyrrolidone.
• organic solvent means organic solvents in general and, in particular, such organic solvents as are conventionally used in paint and coatings. Such organic solvents include low-molecular compounds as well as oligomeric compounds but not polymers.
• the molar mass (in case of low-molecular compounds) or, respectively, the number-average molar mass (in case of an oligomer) of such organic solvents is preferably below 500.
• the number-average molar mass data stated herein are number-average molar masses determined or to be determined by gel permeation chromatography (GPC; divinylbenzene-cross-linked polystyrene as the immobile phase, tetrahydrofuran as the liquid phase, polystyrene standards).
• the non-aqueous solvent composition comprises 0 to 10 wt. %, preferably 0 wt. % of N-alkyl pyrrolidone.
• N-alkylpyrrolidones include N-methylpyrrolidone and N-ethylpyrrolidone.
• the non-aqueous solvent composition comprises 0 to 5 wt. %, preferably 0 wt. % of dimethyl sulfoxide.
• the non-aqueous solvent composition comprises 10 to 50 wt. %, preferably 25 to 35 wt. % of ⁇ -butyrolactone.
• the non-aqueous solvent composition comprises 10 to 50 wt. %, preferably 25 to 35 wt. % of at least one monoalcohol, especially C3-C8 monoalcohol, more especially saturated C3-C8 monoalcohol.
• saturated C3-C8 monoalcohols can include the isomers of propanol, the isomers of butanol, the isomers of pentanol, the isomers of hexanol, the isomers of heptanol, the isomers of octanol, cycloaliphatic monoalcohols such as cyclohexanol, alkyl-substituted derivatives of cyclohexanol with no more than 8 carbon atoms, and the like.
• Preferred saturated C3-C8 monoalcohols can include the isomers of propanol, the isomers of butanol and the isomers of pentanol.
• the non-aqueous solvent composition comprises 10 to 60 wt. %, preferably 30 to 50 wt. % of at least one organic solvent inert towards isocyanate groups, other than ⁇ -butyrolactone, other than N-alkyl pyrrolidone, and consisting of carbon, hydrogen, oxygen and nitrogen, or consisting of carbon, hydrogen and oxygen.
• organic solvents inert towards isocyanate groups, other than ⁇ -butyrolactone and consisting of carbon, hydrogen and oxygen are preferred.
• organic solvents consisting of carbon, hydrogen, oxygen and nitrogen
• organic solvents consisting of carbon, hydrogen, oxygen and nitrogen
• examples of such organic solvents consisting of carbon, hydrogen, oxygen and nitrogen can include acyclic amides like 3-methoxy-N,N-dimethylpropionamide and 3-butoxy-N,N-dimethylpropionamide.
• 3-methoxy-N,N-dimethylpropionamide and 3-butoxy-N,N-dimethylpropionamide are available as Equamide M 100 and Equamide B 100, both from Idemitsu Kosan Co. Ltd., Tokyo.
• organic solvents consisting of carbon, hydrogen and oxygen can include ethers, for example, ethylene glycol di-C1-C6-alkyl ethers, propylene glycol di-C1-C6-alkyl ethers, diethylene glycol di-C1-C6-alkyl ethers, dipropylene glycol di-C1-C6-alkyl ethers and tetrahydrofuran; ketones, for example, acetone, methyl ethyl ketone, methyl propyl ketone, methyl isobutyl ketone, methyl amyl ketone, methyl isoamyl ketone, diethyl ketone, diisobutyl ketone, cyclohexanone, isophorone, 2,4-pentanedione and methoxy hexanone; esters, for example, ethyl ethoxypropionate, methyl glycol acetate, ethyl
• the non-aqueous solvent composition comprises 0 to 10 wt. %, preferably 0 wt. % of at least one additive.
• additives may include defoamers, wetting agents and surfactants.
• the non-aqueous solvent composition consists of
• Preferred non-aqueous solvent compositions according to the invention consist of 25 to 35 wt. % of ⁇ -butyrolactone, 25 to 35 wt. % of at least one monoalcohol, especially C3-C8 monoalcohol, more especially saturated C3-C8 monoalcohol, and 30 to 50 wt. % of at least one organic solvent inert towards isocyanate groups, other than ⁇ -butyrolactone, and consisting of carbon, hydrogen and oxygen, wherein the sum of the wt. % totals 100 wt. %.
• the non-aqueous solvent composition of the invention can be used as barrier liquid within a coating installation of an industrial mass production coating line for the application of water-borne two-component polyurethane coatings.
• the invention relates therefore also to the use of the non-aqueous solvent composition as barrier liquid within a coating installation of an industrial mass production coating line for the application of water-borne two-component polyurethane coatings.
• the coating installation of an industrial mass production coating line for the application of water-borne two-component polyurethane coatings reference is made to the above section “Background of the Invention”.
• such a coating installation comprises, among others, a release valve for a non-aqueous hardener component, typically a non-aqueous polyisocyanate hardener.
• the non-aqueous solvent composition of the invention can in particular be used as barrier liquid within the installation downstream of such non-aqueous hardener component release valve of such coating installation of an industrial mass production coating line for the spray-application of water-borne two-component polyurethane coatings.
• the non-aqueous solvent composition may be filled into the downstream installation so as to entirely fill the downstream installation or to fill at least some space directly downstream of the non-aqueous hardener component release valve, for example, the connection between said valve and the entrance of the mixer.
• 2 pbw of the polyisocyanate composition of reference example 1 were mixed with 1 pbw of the solvent composition of example 3 to form a first solvated polyisocyanate composition.
• 2 pbw of the polyisocyanate composition of reference example 2 were mixed with 1 pbw of the solvent composition of example 3 to form a second solvated polyisocyanate composition.
• 2 pbw of the polyisocyanate composition of reference example 1 were mixed with 1 pbw of the solvent composition of reference example 4 to form a third solvated polyisocyanate composition.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Paints Or Removers (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

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Applications Claiming Priority (3)

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Related Child Applications (1)

Publications (1)

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Citations (2)

Family Cites Families (10)

• 2012
  • 2012-11-19 WO PCT/US2012/065812 patent/WO2013081880A1/en active Application Filing
  • 2012-11-19 CN CN201280068266.9A patent/CN104093790B/zh active Active
  • 2012-11-19 EP EP12795255.4A patent/EP2785805B1/en active Active
  • 2012-11-19 US US14/360,929 patent/US20140299021A1/en not_active Abandoned
• 2015
  • 2015-05-20 US US14/717,473 patent/US20150329726A1/en not_active Abandoned
• 2019
  • 2019-09-03 US US16/559,314 patent/US11639447B2/en active Active

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