CA2092117A1 - Two-component water-based varnishes containing acrylic-urethane polymers - Google Patents
Two-component water-based varnishes containing acrylic-urethane polymersInfo
- Publication number
- CA2092117A1 CA2092117A1 CA002092117A CA2092117A CA2092117A1 CA 2092117 A1 CA2092117 A1 CA 2092117A1 CA 002092117 A CA002092117 A CA 002092117A CA 2092117 A CA2092117 A CA 2092117A CA 2092117 A1 CA2092117 A1 CA 2092117A1
- Authority
- CA
- Canada
- Prior art keywords
- component
- water
- groups
- acrylic
- based varnish
- 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.)
- Abandoned
Links
- 239000002966 varnish Substances 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229920000642 polymer Polymers 0.000 title claims description 8
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000006185 dispersion Substances 0.000 claims abstract description 12
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 8
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 8
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 8
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 6
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 125000004356 hydroxy functional group Chemical group O* 0.000 claims abstract 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- 229920000178 Acrylic resin Polymers 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000012948 isocyanate Substances 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910014033 C-OH Inorganic materials 0.000 description 2
- 229910014570 C—OH Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- -1 Polyethylene Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000004657 carbamic acid derivatives Chemical class 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
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
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
- C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
- C08G18/6225—Polymers of esters of acrylic or methacrylic acid
- C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
-
- 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
- C08G18/0838—Manufacture of polymers in the presence of non-reactive compounds
- C08G18/0842—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents
- C08G18/0861—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of a dispersing phase for the polymers or a phase dispersed in the polymers
- C08G18/0866—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of a dispersing phase for the polymers or a phase dispersed in the polymers the dispersing or dispersed phase being an aqueous medium
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Paints Or Removers (AREA)
- Polyurethanes Or Polyureas (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Abstract Water-based varnish prepared by mixing, just before use, component A, consisting of an aqueous dispersion of an acrylic polymer containing hydroxy functional groups and an aliphatic polyurethane resin, with component B, consisting of a liquid low-volatility aliphatic polyisocyanate with a free -NCO group content of 18.5% to 20.5% by wt., diluted, if necessary, with a solvent, e.g. ethyl acetate.
Description
2 ~
Two-component water-based varnishes containin~ acrylic-urethane polymers ~escription of the invention The present invention relates to water-based varnishes prepared by mixing, just before use, two basic components, i.e.
component A, consisting of an acrylic and urethane polymers aqueous dispersion, and component B7 consisting of a liquid polyisocyanate compound either as is or in the form of a solution, e.g. in ethyl acetate.
The properties of the films obtained from the varnish as per the invention - which envisages the use of polyisocyanate to cross-link the acrylic-urethane polymeric material, are not 1~ those characteristic of thermoplastic non-cross-linked films, but of two-component cross-linked polyurethane systems, which are analogous to those of the known solvent-based systems.
In particular, their resistance to chemicals, to abrasion, etc.
is high, while their appearance is as good as that of the traditional solvent-based varnish films.
The varnish as per the present inventi~n - whose basic polymeric component (component A) is in the form of an aqueous dispersion - has the advantage, arising from the absence of solvents, that it does not cause any harm to the users' health and does not create any atmospheric pollutio~ problem.
Po~meric component A in an aqueous dispersion essentially consists of an acrylic polymer containing free hydroxy groups (2% to L~X by wt. 0~ groups on dry basis) ~ixed with a lower ~92i :~ ~
amount of aliphatic polyurethane resin.
The acrylic resin/polyurethane resin weight ratio ranges between 60/40 and 65/35. The acrylic polymer content ranges from 15% to 18% by wt. of the total aqueous dispersion.
Polymeric dispersion A must act as an emulsifyirlg agent of polyisocyanate (component B).
The polymer particles are 12 to 16 nm in diameter, which is the optimum size for their being uniformly dispersed in the reactive system.
The formulation oP polymeric dispersion A envisages the use of some of the usual additives of water-based systems, e.g.
antifoam and thickening agents, surfactants, extenders, pigments, etc.
The product viscosity is adjusted by water addition, if any, to 40 to 50 sec. (Ford 4 viscosity at 20 C).
Component B, which acts as a cross-linking agent, consists of a low-volatility aliphatic polyisocyanate, in particular low molecular weight isocyanate dimers and trimers. The free -NC0 groups content must range from 18.5% to 20.5% by wt. Component B is used in the liquid form with a viscosity of 50 to 16,000 mPa.s (at 20 C); in particular, with a view to obtaining the convenient viscosity it can be diluted with a solvent, e.g.
ethyl acetate, The react:Lons taking place in the acrylic-urethane-isocyanate polymer system as per the inventl~n may be schematically 2(~2~7 represented as follows.
During the first reaction step between isocyanate and water (non-selective reaction) a carbamic acid derivative is formed through water addition to the NCO groups: said acid easily liberates CO2, being thus converted into NH2 group; this last readily reacts with an isocyanic group with formation of a urea polymer.
Il -N=C=O ~ H20 ---> -NH-C-OH
O
-NH-C-OH ---> -NH2+CO2 o -NH2+0=C=N- ---> -NH-C-NH-The following scheme represents the reaction between the hydro~y acrylic polymer and isocyanate, with formation of a urethane bond:
-N-C=O ~ HO ---> -NH-C-O-g Varnish preparation The varnish is prepared by mixing under stirring, just before use, component A w.ith the isocyanic cross-linking agent B in convenient amounts to obtain a molar ratio between the free isocyanic groups of component B and the free hydroxy groups of component A of 1 to 1.5.
The physicochemical properties of the varnish obtained are as follows:
2~2~7 density at 20 C 1.100 to 1.215 g/c~3 Ford 4 viscosity at 20 C 40 to 50 sec.
dry residue (2 hrs at 130 C) 35% to 45% by wt.
gelling time (time of use) at 20~C 60 to 150 min.
A typical formulation of a varnish according to the invention is reported hereinbelow (% by wt.).
2~92~l~ 7 COMPONENT A % ON THECONTENT OF DRY
WHOLE PRODUCT %
Acrylic resin dispersion with hydroxy groups 51-435 30-32 Aliphatic polyurethane resin dispersion 28.350 33-35 Polyethylene wax emulsion8.000 50-55 Silica 3.125 100 Water 6.874 Preservatives 0.001 15-20 Silicone-based antifoam agent 1.215 100 Silicone 1.000 100 100.000%
COMPONENT B
Low-volatility aliphatic polyisocyanate 50.000% by wt.
~thyl acetate 50.000% by wt.
100.000% by wt.
Weight ratios between the components COMPONE.NT B 10 Performance of the varnish according to the invention The performance test.s carried out on the varnish in actual use gave the results reported in the following table (according to 2 ~f~
BS 6250/3 stAndard for severe-duty horizontal surfaces -excepting kitchen worktops). Application ti~e: 1 hr.
Humid heat ( C)Min. values requestedResults Dry heat ( C3 BS 3962f3 21l 5 Resistance to staining BS 3962L~
Min. values requested Results Acetone 23 4 Ethyl/butyl acetate 23 4 Tea =5 5 Coffee =5 5 Ethyl alcohol (96X) ~3 4 Ethyl alcohol (48%) 24 5 Resistance to oil and grease BS 3962/5 =5 5 The results obtained from the performance tests prove that the film loses its thermoplastic properties and becomes a themosetting material.
VARNISH FILM CROSS-LINKING
Film formation of the two-component water-based acrylic-urethane polymeric system does not occur by coalescence as in the case of the usual aqueous dispersions. Instead, after water evaporation, a 100 to 200 hrs cross-linking reaction takes place to form urethane and urea groups; after that, the physicochemical resistance of the varnish film obtained reaches the highest value.
~ se-E5~perties On the basis of wide experimentation carried out in the commercial plants producing usual solvent varnishes, the application properties of the water-based varnish containing . ' .
: .
2~9~7 acrylic-urethane polymers were found to be good.
e coating film adhesiveness, perPormance and appearance were found to be excellent.
Adhesion According to the tests, adhesion to the following items was excellent:
- wood oP various types - wood particle boards polyester substrates - polyurethane substrates - polyacrylic substrates - polyepoxydic substrates - metallic substrate (iron) - substrate coated with a different water-based varnish Excellent and identical adhesion values (crosshatch test, standard 150-4624) were shown by tests on the various supports.
The MIR (Multiple Internal Reflectance) analysis of the product applied to wood board showed the formation of urea and urethane groups between 1600 and 1640 cm~l, which are the same groups observed in the MIR plot of solvent polyurethane, This is a proof that a reaction occurred between the NCO groups of the cross-linking agent and the OH groups of the acrylic resin aqueous dispersion.
.
Two-component water-based varnishes containin~ acrylic-urethane polymers ~escription of the invention The present invention relates to water-based varnishes prepared by mixing, just before use, two basic components, i.e.
component A, consisting of an acrylic and urethane polymers aqueous dispersion, and component B7 consisting of a liquid polyisocyanate compound either as is or in the form of a solution, e.g. in ethyl acetate.
The properties of the films obtained from the varnish as per the invention - which envisages the use of polyisocyanate to cross-link the acrylic-urethane polymeric material, are not 1~ those characteristic of thermoplastic non-cross-linked films, but of two-component cross-linked polyurethane systems, which are analogous to those of the known solvent-based systems.
In particular, their resistance to chemicals, to abrasion, etc.
is high, while their appearance is as good as that of the traditional solvent-based varnish films.
The varnish as per the present inventi~n - whose basic polymeric component (component A) is in the form of an aqueous dispersion - has the advantage, arising from the absence of solvents, that it does not cause any harm to the users' health and does not create any atmospheric pollutio~ problem.
Po~meric component A in an aqueous dispersion essentially consists of an acrylic polymer containing free hydroxy groups (2% to L~X by wt. 0~ groups on dry basis) ~ixed with a lower ~92i :~ ~
amount of aliphatic polyurethane resin.
The acrylic resin/polyurethane resin weight ratio ranges between 60/40 and 65/35. The acrylic polymer content ranges from 15% to 18% by wt. of the total aqueous dispersion.
Polymeric dispersion A must act as an emulsifyirlg agent of polyisocyanate (component B).
The polymer particles are 12 to 16 nm in diameter, which is the optimum size for their being uniformly dispersed in the reactive system.
The formulation oP polymeric dispersion A envisages the use of some of the usual additives of water-based systems, e.g.
antifoam and thickening agents, surfactants, extenders, pigments, etc.
The product viscosity is adjusted by water addition, if any, to 40 to 50 sec. (Ford 4 viscosity at 20 C).
Component B, which acts as a cross-linking agent, consists of a low-volatility aliphatic polyisocyanate, in particular low molecular weight isocyanate dimers and trimers. The free -NC0 groups content must range from 18.5% to 20.5% by wt. Component B is used in the liquid form with a viscosity of 50 to 16,000 mPa.s (at 20 C); in particular, with a view to obtaining the convenient viscosity it can be diluted with a solvent, e.g.
ethyl acetate, The react:Lons taking place in the acrylic-urethane-isocyanate polymer system as per the inventl~n may be schematically 2(~2~7 represented as follows.
During the first reaction step between isocyanate and water (non-selective reaction) a carbamic acid derivative is formed through water addition to the NCO groups: said acid easily liberates CO2, being thus converted into NH2 group; this last readily reacts with an isocyanic group with formation of a urea polymer.
Il -N=C=O ~ H20 ---> -NH-C-OH
O
-NH-C-OH ---> -NH2+CO2 o -NH2+0=C=N- ---> -NH-C-NH-The following scheme represents the reaction between the hydro~y acrylic polymer and isocyanate, with formation of a urethane bond:
-N-C=O ~ HO ---> -NH-C-O-g Varnish preparation The varnish is prepared by mixing under stirring, just before use, component A w.ith the isocyanic cross-linking agent B in convenient amounts to obtain a molar ratio between the free isocyanic groups of component B and the free hydroxy groups of component A of 1 to 1.5.
The physicochemical properties of the varnish obtained are as follows:
2~2~7 density at 20 C 1.100 to 1.215 g/c~3 Ford 4 viscosity at 20 C 40 to 50 sec.
dry residue (2 hrs at 130 C) 35% to 45% by wt.
gelling time (time of use) at 20~C 60 to 150 min.
A typical formulation of a varnish according to the invention is reported hereinbelow (% by wt.).
2~92~l~ 7 COMPONENT A % ON THECONTENT OF DRY
WHOLE PRODUCT %
Acrylic resin dispersion with hydroxy groups 51-435 30-32 Aliphatic polyurethane resin dispersion 28.350 33-35 Polyethylene wax emulsion8.000 50-55 Silica 3.125 100 Water 6.874 Preservatives 0.001 15-20 Silicone-based antifoam agent 1.215 100 Silicone 1.000 100 100.000%
COMPONENT B
Low-volatility aliphatic polyisocyanate 50.000% by wt.
~thyl acetate 50.000% by wt.
100.000% by wt.
Weight ratios between the components COMPONE.NT B 10 Performance of the varnish according to the invention The performance test.s carried out on the varnish in actual use gave the results reported in the following table (according to 2 ~f~
BS 6250/3 stAndard for severe-duty horizontal surfaces -excepting kitchen worktops). Application ti~e: 1 hr.
Humid heat ( C)Min. values requestedResults Dry heat ( C3 BS 3962f3 21l 5 Resistance to staining BS 3962L~
Min. values requested Results Acetone 23 4 Ethyl/butyl acetate 23 4 Tea =5 5 Coffee =5 5 Ethyl alcohol (96X) ~3 4 Ethyl alcohol (48%) 24 5 Resistance to oil and grease BS 3962/5 =5 5 The results obtained from the performance tests prove that the film loses its thermoplastic properties and becomes a themosetting material.
VARNISH FILM CROSS-LINKING
Film formation of the two-component water-based acrylic-urethane polymeric system does not occur by coalescence as in the case of the usual aqueous dispersions. Instead, after water evaporation, a 100 to 200 hrs cross-linking reaction takes place to form urethane and urea groups; after that, the physicochemical resistance of the varnish film obtained reaches the highest value.
~ se-E5~perties On the basis of wide experimentation carried out in the commercial plants producing usual solvent varnishes, the application properties of the water-based varnish containing . ' .
: .
2~9~7 acrylic-urethane polymers were found to be good.
e coating film adhesiveness, perPormance and appearance were found to be excellent.
Adhesion According to the tests, adhesion to the following items was excellent:
- wood oP various types - wood particle boards polyester substrates - polyurethane substrates - polyacrylic substrates - polyepoxydic substrates - metallic substrate (iron) - substrate coated with a different water-based varnish Excellent and identical adhesion values (crosshatch test, standard 150-4624) were shown by tests on the various supports.
The MIR (Multiple Internal Reflectance) analysis of the product applied to wood board showed the formation of urea and urethane groups between 1600 and 1640 cm~l, which are the same groups observed in the MIR plot of solvent polyurethane, This is a proof that a reaction occurred between the NCO groups of the cross-linking agent and the OH groups of the acrylic resin aqueous dispersion.
.
Claims (4)
1. Water-based varnish prepared by mixing, just before use, the following basic components:
component A: an acrylic-urethane polymer aqueous dispersion, consisting of an acrylic polymer containing hydroxy functional groups (2% to 4% by wt. OH groups on dry basis) mixed with an aliphatic polyurethane resin, the acrylic resin/polyurethane resin weight ratio ranging between 60/40 to 65/35;
component B: low-volatility aliphatic polyisocyanate in the liquid form, containing 18.5% to 20.5% by wt. free -NCO groups, diluted, if necessary, with a solvent, e. g. ethyl acetate;
said component B being mixed with component A in convenient amounts to obtain a molar ratio between -NCO groups and -OH
groups ranging from 1 to 1.5.
component A: an acrylic-urethane polymer aqueous dispersion, consisting of an acrylic polymer containing hydroxy functional groups (2% to 4% by wt. OH groups on dry basis) mixed with an aliphatic polyurethane resin, the acrylic resin/polyurethane resin weight ratio ranging between 60/40 to 65/35;
component B: low-volatility aliphatic polyisocyanate in the liquid form, containing 18.5% to 20.5% by wt. free -NCO groups, diluted, if necessary, with a solvent, e. g. ethyl acetate;
said component B being mixed with component A in convenient amounts to obtain a molar ratio between -NCO groups and -OH
groups ranging from 1 to 1.5.
2. Water-based varnish according to claim 1 wherein component A has an acrylic polymer content of 15% to 18% by wt. of the total.
3. Water-based varnish according to claim 1 wherein polyisocyanate in a 50% by wt. solution with ethyl acetate is used.
4. Water-based varnish according to claim 1 wherein the viscosity of component A is adjusted to 40-50 sec. (Ford 4 viscosity at 20°C).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI92A000671 | 1992-03-23 | ||
| ITMI920671A IT1254549B (en) | 1992-03-23 | 1992-03-23 | WATER-BASED, TWO-COMPONENT, ACRYLIC-POLYURETHANE BASED PRODUCTS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2092117A1 true CA2092117A1 (en) | 1993-09-24 |
Family
ID=11362547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002092117A Abandoned CA2092117A1 (en) | 1992-03-23 | 1993-03-22 | Two-component water-based varnishes containing acrylic-urethane polymers |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0562282A1 (en) |
| CA (1) | CA2092117A1 (en) |
| IT (1) | IT1254549B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5723518A (en) * | 1994-06-03 | 1998-03-03 | Bayer Aktiengesellschaft | Aqueous two-component polyurethane coating compositions and a method for their preparation |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW321660B (en) * | 1994-01-14 | 1997-12-01 | Cytec Tech Corp | |
| US5594065A (en) * | 1995-05-09 | 1997-01-14 | Air Products And Chemicals, Inc. | Two component waterborne crosslinkable polyurethane/acrylate-hybrid systems |
| DE60218387T2 (en) | 2001-07-20 | 2007-11-08 | Rohm And Haas Co. | Aqueous hybrid adhesive composition and method |
| KR20050102148A (en) | 2003-02-28 | 2005-10-25 | 바이엘 머티리얼사이언스 아게 | Method and device for producing a two-component lacquer mixture |
| GB2435472A (en) | 2006-02-23 | 2007-08-29 | 3M Innovative Properties Co | Method for forming an article having a decorative surface |
| US8907007B2 (en) | 2007-10-19 | 2014-12-09 | Axalta Coating Systems Ip Co., Llc | Process for painting substrates |
| EP2203532B1 (en) * | 2007-10-19 | 2013-06-12 | E. I. du Pont de Nemours and Company | Two-component coating compositions |
| ITAR20130029A1 (en) | 2013-07-29 | 2015-01-30 | Ezio Reverberi | INNOVATIVE LEATHER OR CLOTH, MADE OF NATURAL VEGETABLE FABRIC REINFORCED IN THE MASS WITH STONE PARTICLES, MARBLE, COTTO, CRYSTALS, VARIOUS METALS; HARD DUTY, ADAPTABLE TO COVER EVERY KIND OF SURFACE, OBJECT OR SHAPE, UNATTACKABLE |
| CN113943526A (en) * | 2021-10-28 | 2022-01-18 | 河南立邦长润发科技材料有限公司 | Water-based two-component top-coat paint with low VOC (volatile organic compound) emission, and preparation method and application method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3724743A1 (en) * | 1987-07-25 | 1989-04-06 | Westdeutsche Farbengesellschaf | Two-component coating material for the production of coating films on support materials by the screen printing method |
| DE3829587A1 (en) * | 1988-09-01 | 1990-03-15 | Bayer Ag | COATING AGENT, A PROCESS FOR THE PRODUCTION THEREOF, AND THE USE OF SELECTED TWO-COMPONENT POLYURETHANE SYSTEMS AS BINDER FOR SUCH COATING AGENTS |
-
1992
- 1992-03-23 IT ITMI920671A patent/IT1254549B/en active
-
1993
- 1993-02-19 EP EP93102630A patent/EP0562282A1/en not_active Withdrawn
- 1993-03-22 CA CA002092117A patent/CA2092117A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5723518A (en) * | 1994-06-03 | 1998-03-03 | Bayer Aktiengesellschaft | Aqueous two-component polyurethane coating compositions and a method for their preparation |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0562282A1 (en) | 1993-09-29 |
| ITMI920671A1 (en) | 1993-09-23 |
| ITMI920671A0 (en) | 1992-03-23 |
| IT1254549B (en) | 1995-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |