CN104877107A - Aqueous dual-component polyurethane paint system - Google Patents
Aqueous dual-component polyurethane paint system Download PDFInfo
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- CN104877107A CN104877107A CN201410090304.1A CN201410090304A CN104877107A CN 104877107 A CN104877107 A CN 104877107A CN 201410090304 A CN201410090304 A CN 201410090304A CN 104877107 A CN104877107 A CN 104877107A
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Abstract
The invention relates to a polyurethane-based aqueous dual-component polyurethane paint system and a use thereof. The composition contains an aqueous dispersion containing one or more OH functional group-containing compounds, and one or more hydrophobic or hydrophilic modified polyisocyanates, wherein a glass-transition temperature of the aqueous dispersion containing one or more OH functional group-containing compounds is higher than 20 DEG C. Compared with the existing paint system, the aqueous dual-component polyurethane paint system has excellent chemical reagent resistance and a fast drying rate.
Description
Technical field
The present invention relates to a kind of Synthesis and applications with the water-based quick-drying double-constituent polyurethane coating composition of excellent in chemical resistance.
Background technology
When using coating, the situation using water as solvent increases considerably in recent years.The deciding factor developing this technology is the consideration of environment aspect.Such as, when being coated onto on base material by coating, use water as the use that solvent can reduce organic solvent, the volatile organic compounds that can damage the ozone layer after can also making release greatly reduces, and improves the working conditions of user, and reduces the expense of the organic exhaust gas that process produces.
Aqueous polyurethane coating with bi component system has many open in the prior art.Such as, but their character, chemical resistant properties, curing speed, hardness etc. generally have deficiency compared with solvent type polyurethane coating systems.Therefore for different application and the requirement to coating property, need to research and develop different water prescriptions, they comprise polyisocyanate curing agent and water-base resin, suitable additive and/or the catalyzer etc. of specified chemical structure.
US2011/0251332 discloses a kind of aqueous polyurethane coating with bi component system, includes the polyethylene imine increasing curing speed.But it does not mention the performance of this coating in chemical resistant properties and embody rule thereof.
US2010/0233431 discloses a kind of aqueous polyurethane coating with bi component system cleaned, and it has high surface energy and low roughness, but does not have the open character about curing speed and embody rule.
In numerous application of waterborne two-component polyurethane coating system, during as related to volume to volume printing or coating, usually require that coating system has good chemical resistance agents and physical dryness and/or chemosetting speed faster simultaneously.But the coating system being applicable to this application was not also disclosed in the prior art.
Summary of the invention
Exist in the market a kind of demand that can be useful in the coating be beneficial on the various base materials of volume to volume production technique, these base materials comprise timber, leather, metal, plastics, film and paper.This coating should have good resist chemical performance and physical dryness and/or chemosetting speed faster suitably.
The object of this invention is to provide a kind of aqueous bi-component coating system based on urethane, it is to various organic solvent, soda acid, and paraffin, grease etc. all have good corrosion-resistant and/or resistance to crocking.And under different application conditions, particularly when volume to volume printing or coating, physical dryness and/or chemosetting speed faster can be had, go for plastic film coating, fabric coating and paper coating etc.Meanwhile, the coating surface of formation has suitable glossiness and hardness.
On the one hand, the invention discloses a kind of aqueous bi-component coating system based on urethane, comprise the aqueous dispersion of compound a) containing OH functional group containing one or more; And the polyisocyanates of b) one or more hydrophobicitys or hydrophilic modifying; Wherein, described one or more second-order transition temperatures containing the aqueous dispersion of the compound of OH functional group that contain are higher than 20 DEG C.
Wherein, the aqueous dispersion containing OH functional group can comprise acrylic dispersions, and polyisocyanates can by with carbonic ether, sulfonic acid, sulphonate and/or polyethylene oxide group and/or polyethylene/polypropylene oxides is group modified obtains.
On the other hand, the invention also discloses the preparation method of above-mentioned aqueous bi-component coating system and the application in volume to volume coating thereof.
Embodiment
Within the scope of the invention, " two-pack " refers to that at least two due to can interreaction and must before use by the component that can form coating system separately deposited.
" dispersion " refers to the composition comprising another discontinuous phase be dispersed in completely in an external phase.Such as, " aqueous dispersion " refers to the composition comprising particle or the solute be dispersed in water completely.Also one or more cosolvent can be comprised in aqueous dispersion.
Containing the aqueous dispersion of compound containing one or more OH functional groups comprise in principle all to be dissolved or dispersed in water and containing can with the compound of the OH functional group of isocyanate reaction.Although have no particular limits containing the second-order transition temperature during compound Individual existence of OH functional group each comprising in aqueous dispersion, comprise the second-order transition temperature of the aqueous dispersion of all compounds containing OH functional group it is suitable that higher than 20 DEG C.
The example of the suitable compound containing OH functional group has the polymkeric substance of ethylenically unsaturated monomers (so-called polyol polyacrylates), the polymkeric substance (so-called polyol polyester) that dibasic alcohol and di-carboxylic acid combine, the polymkeric substance (so-called polyatomic alcohol polyurethane) that dibasic alcohol, di-carboxylic acid and vulcabond combine and/or the mixed system prepared by described polyvalent alcohol, as the polymkeric substance of polyol polyacrylates-polyester, polyol polyacrylates-urethane or polyol polyester-urethane.Carboxylic acid, carboxylate group can be comprised, sulfonate ester group and/or have ring grease structure without carboxyl (methyl) acrylate structural unit and arbitrary combination thereof.When aqueous dispersion comprises sulfonate ester group, the amount of sulfonate ester group and carboxylic acid and/or carboxylate group is 0-4.5 milligramequivalent/100g solid resin; When have ring grease structure without carboxyl (methyl) acrylate structural unit time, the hydroxy-acid group that at least 25mol% contains the dispersion of OH functionality exists with the form of thanomin neutralization, and the hydroxy-acid group that preferably at least 40mol% contains the dispersion of OH functionality exists with the form of trolamine neutralization.
This aqueous dispersion preferably but be not limited to vinylformic acid secondary breakup body, vinylformic acid one-level dispersion (also claiming emulsion), styrene-acrylic emulsion, polyester modification acrylic acid dispersion, polyurethane dispersions, polyurethane-modified acrylic acid dispersion, polyester dispersions, particularly preferably vinylformic acid secondary breakup body and vinylformic acid one-level dispersion used in combination.
The suitable aqueous dispersion containing OH functional group to comprise disclosed in following patent can with the compound/polymkeric substance of isocyanate reaction: EP-0947557, EP-1510561, DE-102004054447, EP-1657270, EP-1702954, EP-1862485, EP-2025690, EP-0537568, EP-0543228, EP-0758007, EP-0841352, EP-1141065, EP-1024184, DE-4439669.Specially suitable is vinylformic acid one-level and secondary breakup body and reaction system disclosed in following patent: EP-0557844, EP-0358979, EP-1391469 and EP-1599525.Patents all above is openly incorporated to herein as a reference all by reference.
The OH content of described vinylformic acid one-level dispersion is 0-9 % by weight, and in water-based hydroxyl compound by weight by 100wt.%, acid number is 0-150mg KOH/g, second-order transition temperature 20 ~ 100 DEG C (measuring according to differential scanning calorimetry); The number-average molecular weight (according to gel permeation chromatography) of described vinylformic acid one-level dispersion is 500-1,000,000.Preferred OH (hydroxyl) content of described vinylformic acid one-level dispersion is 1.5 % by weight-2.5 % by weight, and acid number is 0-7mg KOH/g, second-order transition temperature 60 ~ 90 DEG C.
The OH content of described vinylformic acid secondary breakup body is 1.0-9.0 % by weight, and in water-based hydroxyl compound by weight by 100wt.%, acid number is 0-200mg KOH/g, second-order transition temperature 20 ~ 70 DEG C; The number-average molecular weight of described vinylformic acid secondary breakup body is 500-100,000.Preferred OH (hydroxyl) content of described vinylformic acid secondary breakup body is 3.5-4.5 % by weight, and acid number is 5-100mg KOH/g, second-order transition temperature 40 ~ 60 DEG C.
Polyisocyanate component b) be made up of any organic multiple isocyanate, they contain the free isocyanate groups group with aliphatic, alicyclic, aryl aliphatic and/or aryl bonding, be at room temperature liquid, or with solvent cut, to make it at room temperature for liquid.Polyisocyanate component b) be 10-15000mPas the viscosity of 23 DEG C, be preferably 50-10000mPas, be preferably 500-6000mPas.Polyisocyanate component b) particularly preferably by containing only forming with the polyisocyanates of isocyanate groups of aliphatic series and/or alicyclic bonding or polyisocyanate mixtures, tool (on average) NCO functionality is between 1.8-4.2, and the viscosity of 23 DEG C is 500-6000mPas.
Suitable polyisocyanates including but not limited to, isophorone diisocyanate (IPDI), the own diester of two isocyanic acid (HDI), Isosorbide-5-Nitrae-two isocyanato cyclohexanes, two (4-isocyano network cyclohexyl) methane (
w, Bayer AG, Leverkusen), 1,3-bis-isocyano network benzene, 2,4-and/or 2,6-tolylene diisocyanate (TDI), two isocyano network ditans (MDI), m-xylylene diisocyanate (XDI) and ω, ω '-two isocyano network-1,3-methylcyclohexane (H
6xDI) polyisocyanates.
Described vulcabond can optionally use like this, but the derivative of usual vulcabond.Suitable derivative has and comprises biuret, isocyanuric acid ester, urea diketone, carbamate, the iminooxadiazinedionepolyisocyanates diketone (polyisocyanates of oxadiazine dione), oxadiazine triketone, carbodiimide, acylurea and allophanate groups.
Such as TIN (three isocyano network nonanes) such triisocyanate is also suitable for.
When the aqueous dispersion containing OH functional group is enough hydrophilic, hydrophobic polyisocyanates can be used, but their viscosity is general lower.
Can to polyisocyanate component b) carry out hydrophilic modifying.Such as, by with carboxyl, sulfo group and/or polyethylene oxide group and/or polyethylene/polypropylene oxides group modified, water-soluble or water dispersible polyisocyanates can be obtained.
Such as, by reacting with monohydroxy hydrophilic polyether alcohol in shortage, polyisocyanates hydrophilization can be made.For example, the preparation of this hydrophilization polyisocyanates is shown in and is set forth in EP-A0540985p.3 the 55th row-p.4 the 5th row.Comprise the polyisocyanates also extremely suitable of allophanate groups, see that to be set forth in EP-A-0959087p.3 39-51 capable, it reacts by low monomeric polyisocyanate and polyethylene oxide Aethoxy Sklerol and prepares under allophanatization condition.Water dispersible polyisocyanate mixtures based on three isocyano network nonanes described in DE-A10007821p.2 66-p.3 the 5th row is also suitable, also has the polyisocyanates of described ionic group (sulfo group, the phosphino-) hydrophilizations such as the capable or WO01/88006 of DE10024624p.3 13-33.Add emulsifying agent to carry out external hydrophilic and turn into being possible equally.
Isocyanate component used also can with carrying out part block with the component of isocyanate reaction, and such as, block section can reach 1/3 of existing different propylhomoserin enzyme.In the case, the isocyanate component of block can react with the polyvalent alcohol added further, to be cross-linked further in the step below.The block agent be suitable for has: monohydroxy-alcohol, lactan, phenol, amine and dimethyl maleate, ethyl maleate or dibutyl maleinate etc.
The polyisocyanates of hydrophilic modifying preferably but be not limited to polyether-modified hexamethylene diisocyanate polymer (HDI), polyether-modified isophorone diisocyanate polymer (IPDI), the hexamethylene diisocyanate polymer of sulfonic acid ammonium salt modification and sulfonic acid ammonium salt modified isophorone diisocyanate polymer, the hexamethylene diisocyanate polymer of particularly preferably sulfonic acid ammonium salt modification.The isocyanate content of the hexamethylene diisocyanate polymer (HDI polymer) of described sulfonic acid ammonium salt modification, preferably but be not limited to 10-25wt.%, particularly preferably 15-24wt.%, in hexamethylene diisocyanate (HDI) polymeric weight by 100wt.%.
In principle, the mixture of different polyisocyanates can naturally also be used.
In described aqueous bi-component coating system, the ratio of NCO (isocyanic ester) functionality and OH functionality is 0.5: 1-5: 1.
In described aqueous bi-component coating system, the aqueous dispersion containing OH functional group is a) 80 weight parts, polyisocyanates b) be 20 weight parts.
Aqueous bi-component coating system provided by the present invention, can further include solvent, auxiliary agent, additive, wax and/or silicone resin.
Described solvent, preferably but be not limited to 1-Methoxy-2-propyl acetate, propandiol butyl ether acetic ester, PGDA, polycarbonate, butyl glycol ether, butyl, propylene glycol monomethyl ether, propandiol butyl ether, dipropylene, lauryl alcohol ester (texanol).Particularly preferably 1-Methoxy-2-propyl acetate, butyl glycol ether, propylene glycol monomethyl ether, propandiol butyl ether, propandiol butyl ether acetic ester.
The consumption of described solvent is 0-15 weight part, preferably 3 ~ 8 weight parts.
Described auxiliary agent and/or additive, can be selected from following one or more: moistening flatting agent, defoamer, thickening material, pigment, dispersing auxiliary, catalyzer, anti skinning agent, anti-sedimentation agent, coupling agent, aminoresin and/or emulsifying agent.Described moistening flatting agent, preferably but be not limited to polyether-modified polydimethylsiloxane.Described defoamer, preferably but be not limited to water drain silica modified mineral oil, organic siloxane solution.The consumption of described auxiliary agent and/or additive is 1-15 weight part, preferred 5-15 weight part.
Described wax, preferably but be not limited to polyethylene wax, Poly Propylene Wax, tetrafluoroethylene wax, carnauba wax, amide waxe, organic polymer.Particularly preferably polythene wax emulsion, polypropylene wax emulsion.The consumption of wax is 0 ~ 15 weight part, preferably 4 ~ 8 weight parts.
Described silicone resin preferably but be not limited to containing or not hydroxyl organosilicon polyacrylic ester, containing or not hydroxyl modified dimethyl polysiloxane.Particularly preferably hydroxyl modified dimethyl polysiloxane emulsion.The consumption of silicone resin is 0 ~ 10 weight part, preferably 2 ~ 5 weight parts.
Described coupling agent, preferably but be not limited to the coupling agent etc. of organo-siloxane coupling agent, titanate coupling agent, aluminate coupling agent, bimetal coupling agent, phosphate coupling agent, boric acid ester coupler, chromium complex and other higher fatty acid, alcohol, ester, particularly preferably organo-siloxane coupling agent, titanate coupling agent.The consumption of coupling agent is 0.01 ~ 5.0 weight part, preferably 0.1 ~ 2.0 weight part.
Preferably but be not limited to urea-formaldehyde resin, terpolycyantoamino-formaldehyde resin and Polyamide-Polyamsne-Epichlorohydrin resin, particularly preferably terpolycyantoamino-formaldehyde resin is as methyl-etherified melamine formaldehyde resin, butyl ether melamine formaldehyde resin for described aminoresin.The consumption of aminoresin is 1.0 ~ 40.0 weight parts, preferably 2.0 ~ 25.0 weight parts.
Aqueous bi-component coating system of the present invention can also comprise catalyzer.Catalyzer known in the art optionally can make isocyanic ester and alcohol or polyvalent alcohol, instead of water rapid reaction.Preferred catalyzer comprises dibutyl tin laurate (DBTL), carboxylic acid zirconium, the compound of the 5th and the 6th subgroup element in zirconium acetylacetonate (IV) and the periodic table of elements, wherein the oxidation state of often kind of element is at least+4, preferably but be not limited to above-claimed cpd acid and containing hydrochlorate, comprise organic salt and/or inorganic salt.About the kind of catalyzer, choice and operation can with reference to Journal of Coatings Technology, and 2002,74 (930), 31-36; Paint and Coatings Industry, 2002,16,80; WO00/47642 and WO98/41322 etc.The consumption of catalyzer is 0.0001 ~ 5.0 weight part, preferably 0.001 ~ 2.0 weight part.
Aqueous bi-component coating system of the present invention can also comprise reactive thinner, such as, by the hydroxyl-functional polycarbonate polyol disclosed in CN1837251B or by the compound containing lactone groups disclosed in CN1781960A.The consumption of reactive thinner is 1 ~ 10 weight part, preferably 2 ~ 5 weight parts.
Each weight part is all be 100 parts by weight with the gross weight of aqueous bi-component coating system above.
Aqueous bi-component coating system provided by the invention in use, usually can by component a), and the aqueous dispersion namely containing OH functional group is for subsequent use as paint vehicle part sealed type storage; By components b), namely polyisocyanates is as curing agent part, and sealed type storage is for subsequent use; Before application, curing agent part and paint vehicle part are mixed to get aqueous bi-component coating system.
Can in advance by solvent, auxiliary agent, additive, wax, silicone resin, catalyzer, coupling agent, aminoresin, reactive thinner etc. first with component a), the aqueous dispersion mixing namely containing OH functional group is for subsequent use as paint vehicle part sealed type storage; By components b), namely polyisocyanates is as curing agent part, and sealed type storage is for subsequent use; Before application, curing agent part and paint vehicle part are mixed to get aqueous bi-component coating system.
Also can optionally a part for solvent, auxiliary agent, additive, wax, silicone resin, catalyzer, coupling agent, reactive thinner etc. be mixed separately or and components b), i.e. polyisocyanates mixing.
Coating completes by quite multiple spraying coating process, as pressurized air, HVLP, without gas, mixing air or electrostatic painting process.Also can apply with additive method, such as brushing, roller coat or blade coating.
Volume to volume is coated with preferably but is not limited to half tone, relief printing plate, intaglio plate, lithographic plate, silk screen, ink-jet and flexo etc. is undertaken by " volume to volume " cooked mode, particularly preferably aqueous bi-component coating system provided by the present invention is coated substrate surface by intaglio plate and silk screen coating method, the polyurethane coating of ground is attached to obtained one, described ground can carry out in high temperature drying tunnel, to accelerate dry and to improve printing efficiency, curing chamber is put into again, slaking 1 ~ 5 day after coating.
The present invention is illustrated by following embodiment, and these embodiments should not be regarded as conditional.Unless otherwise stated, weight fraction is herein in 100 weight fraction based on the gross weight of aqueous bi-component coating system.
Embodiment
raw material and reagent
The coating test event that the present invention relates to comprises resistant to liquids paraffin project and drying property test event.Ground used, pre-treatment and detection and method for making sample list in table 1.
The selection of table 1 ground and pre-treatment
The preparation of coating test sample, preferably but be not limited to adopt the coating of line rod obtained, slaking 24 hours in 60 DEG C of baking ovens.According to actual needs, wet film film thickness is set as 6 ~ 120 μm.
comparative example 1
The preparation of component A
83.33g is dropped in agitator vessel
a XP2588, under middle low speed (about 1000-1200rpm) stirs, slowly drop into 16.67g BA successively, after stirring, use 400 object filter screens to be filtered by above finished product, gained finished product should adopt sealed vessel properly to store, and deposit after at least 24 hours and can use.
The preparation of B component
l75 with
n3390BA is by 3: 2 (weight ratio) mixing.
Use and sample preparation
By component A and B component 120.00/25.00 precise in mass ratio, adopt manual stirring to mix, stir 5 minutes, guarantee that component A and B component fully mix, can use.
On ground, with the described composition of line rod coating, slaking 24 hours in 60 DEG C of baking ovens, forms dry film, described build 8 ~ 10 microns.
The resistant to liquids of testing described film is Paraffinic, and acquired results lists in table 2.
On ground, with the described composition of line rod coating, in 60 DEG C of baking ovens, test dried coating film degree after dry 20 seconds, acquired results lists in table 3.
embodiment 1
The preparation of component A
47.00g is dropped in agitator vessel
a2601, under middle low speed (about 1000-1200rpm) stirs, slowly drops into 11.00g deionized water, 42.00g
improve mixing speed after A2546 to 2500rpm, and keep this rotating speed to disperse 20 minutes, namely complete the preparation of component A.
Use 400 object filter screens to be filtered by above finished product, gained finished product should adopt sealed vessel properly to store, and deposit after at least 24 hours and can use.
The preparation of B component
B component is
2487/1, with MPA with solidifying agent/MPA=3/1 dilution.
Use and sample preparation
By component A and B component 100.00/25.00 precise in mass ratio, adopt manual stirring to mix, stir 5 minutes, guarantee that component A and B component fully mix, can use.
On ground, with the described composition of line rod coating, slaking 24 hours in 60 DEG C of baking ovens, forms dry film, described build 8 ~ 10 microns.
The resistant to liquids of testing described film is Paraffinic, and acquired results lists in table 2.
On ground, with the described composition of line rod coating, in 60 DEG C of baking ovens, test dried coating film degree after dry 20 seconds, acquired results lists in table 3.
embodiment 2
The preparation of component A
42.00g is dropped in agitator vessel
a2601, under middle low speed (about 1000-1200rpm) stirs, slowly drops into 11.00g deionized water, 47.00g successively
a2542 improves mixing speed subsequently to 2500rpm, and keeps this rotating speed to disperse 20 minutes, namely completes the preparation of component A.
Use 400 object filter screens to be filtered by above finished product, gained finished product should adopt sealed vessel properly to store, and deposit after at least 24 hours and can use.
The preparation of B component
B component is
2487/1, with MPA with solidifying agent/MPA=3/1 dilution.
Use and sample preparation
By component A and B component 100.00/28.00 precise in mass ratio, adopt manual stirring to mix, stir 5 minutes, guarantee that component A and B component fully mix, can use.
On ground, with the described composition of line rod coating, slaking 24 hours in 60 DEG C of baking ovens, forms dry film, described build 8 ~ 10 microns.
The resistant to liquids of testing described film is Paraffinic, and acquired results lists in table 2.
On ground, with the described composition of line rod coating, in 60 DEG C of baking ovens, test dried coating film degree after dry 20 seconds, acquired results lists in table 3.
embodiment 3
The preparation of component A
42.00g is dropped in agitator vessel
a2601, under middle low speed (about 1000-1200rpm) stirs, slowly drops into 11.00g deionized water, 47.00g successively
a2427 improves mixing speed subsequently to 2500rpm, and keeps this rotating speed to disperse 20 minutes, namely completes the preparation of component A.
Use 400 object filter screens to be filtered by above finished product, gained finished product should adopt sealed vessel properly to store, and deposit after at least 24 hours and can use.
The preparation of B component
B component is
304, with MPA with solidifying agent/MPA=3/1 dilution.
Use and sample preparation
By component A and B component 100.00/28.50 precise in mass ratio, adopt manual stirring to mix, stir 5 minutes, guarantee that component A and B component fully mix, can use.
On ground, with the described composition of line rod coating, slaking 24 hours in 60 DEG C of baking ovens, forms dry film, described build 8 ~ 10 microns.
The resistant to liquids of testing described film is Paraffinic, and acquired results lists in table 2.
On ground, with the described composition of line rod coating, in 60 DEG C of baking ovens, test dried coating film degree after dry 20 seconds, acquired results lists in table 3.
embodiment 4
The preparation of component A
89.00g is dropped in agitator vessel
a2601, under middle low speed (about 1000-1200rpm) stirs, slowly drops into 0.40g BYK024,0.20g BYK348,0.80g successively
104BC, 1.80g BG, 0.60g DPnB, 2.20g deionized water, 5.00gEmulsion39235 improves mixing speed subsequently to 2500rpm, and keeps this rotating speed to disperse 20 minutes, namely completes the preparation of component A.
Use 400 object filter screens to be filtered by above finished product, gained finished product should adopt sealed vessel properly to store, and deposit after at least 24 hours and can use.
The preparation of B component
B component is
xP2487/1,
401-70, solvent MPA mix with 16.8/8.0/4.2 ratio.
Use and sample preparation
By component A and B component 100.00/29.00 precise in mass ratio, adopt manual stirring to mix, stir 5 minutes, guarantee that component A and B component fully mix, can use.
On ground, with the described composition of line rod coating, slaking 24 hours in 60 DEG C of baking ovens, forms dry film, described build 8 ~ 10 microns.
The resistant to liquids of testing described film is Paraffinic, and acquired results lists in table 2.
On ground, with the described composition of line rod coating, in 60 DEG C of baking ovens, test dried coating film degree after dry 20 seconds, acquired results lists in table 3.
embodiment 5
The preparation of component A
89.00g is dropped in agitator vessel
a2601, under middle low speed (about 1000-1200rpm) stirs, slowly drop into 0.40g BYK024 successively, 0.20g BYK348,0.80gSurfynol104BC, 1.80g BG, 0.60g DPnB, 2.20g deionized water, 5.00gEmulsion39235 improves mixing speed subsequently to 2500rpm, and keep this rotating speed to disperse 20 minutes, namely complete the preparation of component A.
Use 400 object filter screens to be filtered by above finished product, gained finished product should adopt sealed vessel properly to store, and deposit after at least 24 hours and can use.
The preparation of B component
B component is
2487/1, with MPA with solidifying agent/MPA=3/1 dilution.
Use and sample preparation
By component A and B component 100.00/25.00 precise in mass ratio, adopt manual stirring to mix, stir 5 minutes, guarantee that component A and B component fully mix, can use.
On ground, with the described composition of line rod coating, slaking 24 hours in 60 DEG C of baking ovens, forms dry film, described build 8 ~ 10 microns.
The resistant to liquids of testing described film is Paraffinic, and acquired results lists in table 2.
On ground, with the described composition of line rod coating, in 60 DEG C of baking ovens, test dried coating film degree after dry 20 seconds, acquired results lists in table 3.
test result
Resistant to liquids paraffin passes judgment on the aqueous double-component coating system based on urethane, and time especially as printing varnish, one of important index of quality good or not is also more unapproachable technical indicator.
Reference standard EN12720 furniture surface is to the assessment method of liquid chemical substance resistance, and detection time is 24 hours
5 grades: best, without any change before and after test;
4 grades: gloss and the very slight change of color before and after test, these changes could find facing to light source;
3 grades: pilot region has slight trace, multiple angle can find these traces;
2 grades: pilot region has obvious trace, but surface tissue is not destroyed;
1 grade: the poorest, pilot region has obvious trace, but surface tissue is destroyed, or filter paper is adhered to analyte surface;
As can be seen from table 2 kind, resistant to liquids paraffin performance when aqueous double-component coating system of the present invention uses as printing varnish is significantly better than business-like solvent-based two-component urethane printing varnish.
The resistant to liquids paraffin Performance comparision of table 2. film
The dry after coating speed of coating is also the important indicator of coating system performance.Fast and the degree of drying of rate of drying can make well work more efficient.
The present invention does solid work assay method, in order to lower standard evaluation with reference to GB/T1728-1979 paint film:
5 grades: best, appearance of film does not change, and filter paper can natural separation, and film coated surface is not clamminess;
The area of 4 grades: film coated surface <10% is destroyed, and filter paper can natural separation, and film coated surface is slightly clamminess;
3 grades: the area of film coated surface 10% ~ 50% is destroyed, and need external force to be separated filter paper, film coated surface is obviously clamminess;
2 grades: the area of film coated surface 50% ~ 90% is destroyed, and need external force to be separated filter paper, film coated surface is obviously clamminess;
1 grade: the poorest, the area of film coated surface >90% is destroyed, and need larger external force to be separated filter paper, film coated surface is obviously clamminess;
As can be seen from Table 3, although be water-based, coating system of the present invention has the drying property no less than business-like solvent-based two-component coating system.
The drying property of table 3. film compares
Those skilled in the art easily knows, the present invention is not limited only to aforesaid detail, and under the prerequisite not departing from spirit of the present invention or main characteristic, the present invention can be embodied as other particular forms.Therefore from all should be nonrestrictive by described embodiment regarded as illustrative any angle, thus by claims but not scope of the present invention is pointed out in aforementioned explanation; And therefore any change, as long as in its implication belonging to claim equivalent and scope, all should regard as and belong to the present invention.
Claims (8)
1., based on the aqueous bi-component coating system of urethane, comprise
A) aqueous dispersion of the compound of OH functional group is contained containing one or more; With
B) polyisocyanates of one or more hydrophobicitys or hydrophilic modifying;
Wherein, described one or more second-order transition temperatures containing the aqueous dispersion of the compound of OH functional group that contain are higher than 20 DEG C.
2. coating system as claimed in claim 1, wherein, described one or more aqueous dispersion containing the compound of OH functional group that contain comprise acrylic dispersions.
3. coating system as claimed in claim 2, wherein, described acrylic dispersions comprises secondary polymerization thing dispersion.
4. coating system as claimed in claim 1, wherein, described polyisocyanates is hydrophilic modifying.
5. coating system as claimed in claim 4, wherein, the hydrophilic modifying of described polyisocyanates is by with carbonic ether, sulfonic acid, sulphonate and/or polyethylene oxide group and/or polyethylene/polypropylene oxides is group modified obtains.
6. coating system as claimed in claim 1, also comprises auxiliary agent and/or additive.
7. coating system as claimed in claim 6, wherein, described auxiliary agent and/or additive-package are containing defoamer, thickening material, pigment, dispersing auxiliary, catalyzer, anti skinning agent, anti-sedimentation agent, coupling agent, aminoresin or emulsifying agent.
8. the application of coating system as claimed in claim 1 in volume to volume coating.
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| CN201410090304.1A CN104877107A (en) | 2014-02-28 | 2014-02-28 | Aqueous dual-component polyurethane paint system |
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| CN201410090304.1A CN104877107A (en) | 2014-02-28 | 2014-02-28 | Aqueous dual-component polyurethane paint system |
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| CN201410090304.1A Pending CN104877107A (en) | 2014-02-28 | 2014-02-28 | Aqueous dual-component polyurethane paint system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396586A (en) * | 2018-04-02 | 2018-08-14 | 郑州博物馆 | A kind of reinforcing liquid reinforced for paper relics |
| CN108795137A (en) * | 2018-07-06 | 2018-11-13 | 广州茵诺威化工有限公司 | Modified warming agent and reversible thermocoating and preparation method thereof and product |
| CN111073497A (en) * | 2019-12-31 | 2020-04-28 | 山东七维新材料有限公司 | Waterborne acrylic polyurethane finish paint capable of obviously improving explosion limit |
| CN111501346A (en) * | 2020-05-13 | 2020-08-07 | 常州雅美特窗饰股份有限公司 | Method for preventing curtain coating slurry from coagulating |
| CN111944402A (en) * | 2020-07-21 | 2020-11-17 | 广东立邦长润发科技材料有限公司 | High-water-resistance water-based two-component matte top-coat paint and preparation method thereof |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396586A (en) * | 2018-04-02 | 2018-08-14 | 郑州博物馆 | A kind of reinforcing liquid reinforced for paper relics |
| CN108396586B (en) * | 2018-04-02 | 2020-09-08 | 郑州博物馆 | Reinforcing liquid for reinforcing paper cultural relics |
| CN108795137A (en) * | 2018-07-06 | 2018-11-13 | 广州茵诺威化工有限公司 | Modified warming agent and reversible thermocoating and preparation method thereof and product |
| CN111073497A (en) * | 2019-12-31 | 2020-04-28 | 山东七维新材料有限公司 | Waterborne acrylic polyurethane finish paint capable of obviously improving explosion limit |
| CN111501346A (en) * | 2020-05-13 | 2020-08-07 | 常州雅美特窗饰股份有限公司 | Method for preventing curtain coating slurry from coagulating |
| CN111944402A (en) * | 2020-07-21 | 2020-11-17 | 广东立邦长润发科技材料有限公司 | High-water-resistance water-based two-component matte top-coat paint and preparation method thereof |
| 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 |
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