CN118406428B - Wear-resistant water-based finish paint applied to coil steel and preparation method thereof - Google Patents
Wear-resistant water-based finish paint applied to coil steel and preparation method thereof Download PDFInfo
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- 239000003973 paint Substances 0.000 title claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 44
- 239000010959 steel Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- -1 aliphatic anion Chemical class 0.000 claims abstract description 37
- 239000012948 isocyanate Substances 0.000 claims abstract description 25
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 25
- 239000008367 deionised water Substances 0.000 claims abstract description 21
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 21
- 229920002635 polyurethane Polymers 0.000 claims abstract description 21
- 239000004814 polyurethane Substances 0.000 claims abstract description 21
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 58
- 229920003009 polyurethane dispersion Polymers 0.000 claims description 51
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 46
- 239000000049 pigment Substances 0.000 claims description 30
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 29
- 229920000570 polyether Polymers 0.000 claims description 29
- 239000000945 filler Substances 0.000 claims description 28
- 239000000839 emulsion Substances 0.000 claims description 26
- 229920000515 polycarbonate Polymers 0.000 claims description 26
- 239000004417 polycarbonate Substances 0.000 claims description 26
- 239000007787 solid Substances 0.000 claims description 26
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 25
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 25
- 239000011787 zinc oxide Substances 0.000 claims description 23
- 239000007822 coupling agent Substances 0.000 claims description 22
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 20
- 239000000314 lubricant Substances 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 17
- 229920000728 polyester Polymers 0.000 claims description 17
- 239000000377 silicon dioxide Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 16
- 235000012239 silicon dioxide Nutrition 0.000 claims description 16
- 239000004698 Polyethylene Substances 0.000 claims description 15
- 229920000573 polyethylene Polymers 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 14
- 125000001931 aliphatic group Chemical group 0.000 claims description 12
- 229920001228 polyisocyanate Polymers 0.000 claims description 12
- 239000005056 polyisocyanate Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 230000004224 protection Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 17
- 239000002518 antifoaming agent Substances 0.000 description 17
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 14
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 229920001225 polyester resin Polymers 0.000 description 10
- 239000004645 polyester resin Substances 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 8
- 239000013530 defoamer Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 239000004408 titanium dioxide Substances 0.000 description 7
- DCQBZYNUSLHVJC-UHFFFAOYSA-N 3-triethoxysilylpropane-1-thiol Chemical compound CCO[Si](OCC)(OCC)CCCS DCQBZYNUSLHVJC-UHFFFAOYSA-N 0.000 description 5
- 239000013522 chelant Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 229920005830 Polyurethane Foam Polymers 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 238000013035 low temperature curing Methods 0.000 description 3
- 239000011496 polyurethane foam Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 230000036561 sun exposure Effects 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000004383 yellowing Methods 0.000 description 3
- 230000006750 UV protection Effects 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229920003180 amino resin Polymers 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000004185 ester group Chemical group 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- IRERQBUNZFJFGC-UHFFFAOYSA-L azure blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[S-]S[S-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] IRERQBUNZFJFGC-UHFFFAOYSA-L 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007539 photo-oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000001038 titanium pigment Substances 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- 235000013799 ultramarine blue Nutrition 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N urethane group Chemical group NC(=O)OCC JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
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- Paints Or Removers (AREA)
Abstract
The application relates to the technical field of coil steel coating, in particular to wear-resistant water-based finish paint applied to coil steel and a preparation method thereof. The wear-resistant water-based finish paint comprises the following components in parts by mass: 40-80 parts of aliphatic anion polyurethane dispersoid, 10-25 parts of modified color paste, 5-10 parts of closed isocyanate, 1-10 parts of auxiliary agent and 10-20 parts of deionized water. The application solves the problems of insufficient environmental protection, poor wear resistance and poor flexibility of the coil steel finish paint in the prior art, has excellent weather resistance and self-cleaning property, and can be applied to the field of construction, in particular to a detachable container house.
Description
Technical Field
The application relates to the technical field of coil steel coating, in particular to wear-resistant water-based finish paint applied to coil steel and a preparation method thereof.
Background
The precoated coil steel can be directly processed and formed, has attractive appearance and good anti-corrosion performance, and is widely used in the fields of buildings, household appliances, automobiles and the like. The common precoated coil steel mainly comprises a primer, a finish and a back finish, wherein the finish is an important link, and has high performance requirements on a coating film, including good decorative property, protection property, durability, construction property and the like.
The precoated coil steel is widely used in container houses except for common building facades, roofs, fences, doors and windows and the like in the application of the building field, and the precoated coil steel for the container houses can be detached for recycling besides being installed, so that the precoated coil steel has higher wear resistance than the common precoated coil steel except for damage of a finish paint coating caused by collision in the transportation and storage processes.
In the prior art, polyester resin is used as film forming resin in coil steel finishing paint, for example, chinese patent with the authority of publication number CN104031535B discloses a low-matte polyester finishing paint and a preparation method thereof, wherein the low-matte polyester finishing paint comprises the following raw materials: polyester resin A, polyester resin B, pigment, amino resin, wax auxiliary agent and other auxiliary agents; wherein, the amino ratio of the polyester is 3-7, and the pigment ratio is 0.7-1.2; the dosage of the wax auxiliary agent is 0.1-1.5 parts of the wax auxiliary agent per 100 parts of raw materials. The finishing paint can be rapidly cured at the temperature of PMT 204-232 ℃; the T-bend can reach 0T without cracks, the flexibility is good, and the phenomenon of paint dropping in the processing and processing process is avoided; MEK rub resistance is over 100 times, scratch resistance and abrasion resistance are excellent. However, the finishing paint obtained by the technical scheme is solvent finishing paint, is not environment-friendly and has abrasion resistance to be improved. The Chinese patent with publication number of CN110760249A discloses a low-temperature curing polyester finishing paint for precoated metal coiled materials and a preparation method thereof, wherein the low-temperature curing polyester finishing paint comprises the following components in percentage by mass: 45-55 parts of composite polyester resin, 15-25 parts of amino resin and 35-40 parts of compound solvent, wherein the composite polyester resin is formed by combining micro-branched polyester resin with the viscosity of 7-17 seconds and high-hydroxyl-value polyester resin according to the mass ratio of 1:1.3, the acid value of the micro-branched polyester resin is 3.8mgKOH/g, the hydroxyl value of the micro-branched polyester resin is 88.5mgKOH/g, and the hydroxyl value of the high-hydroxyl-value polyester resin is 220-260 mgKOH/g; the low-temperature curing polyester finishing paint for the precoated metal coiled material prepared by the technical scheme has good mechanical properties, has excellent properties such as alkali resistance, acid resistance, wear resistance, ultraviolet resistance and the like, has good adhesive force to the surfaces of various treated or untreated base materials, and is not easy to fall off. However, the technical scheme can only reach 3T, the flexibility is poor, and the specific wear resistance is not shown.
Disclosure of Invention
The application aims to provide wear-resistant water-based finish paint applied to coil steel and a preparation method thereof, which solve the problems of insufficient environmental protection, wear resistance and poor flexibility of the coil steel finish paint in the prior art and have excellent weather resistance and self-cleaning property, and can be applied to the field of construction, in particular to a detachable container house.
The application provides a wear-resistant water-based finish paint applied to coil steel, which comprises the following components in parts by mass: 40-80 parts of aliphatic anion polyurethane dispersoid, 10-25 parts of modified color paste, 5-10 parts of closed isocyanate, 1-10 parts of auxiliary agent and 10-20 parts of deionized water;
the preparation method of the modified color paste comprises the following steps:
s1: mixing pigment and filler, deionized water and isopropanol, adding titanate coupling agent, and modifying at 40-70 ℃ for 40-60min at 800-1200r/min to obtain slurry;
s2, placing silicon dioxide in a silane coupling agent solution, and modifying for 1-2 hours at the temperature of 50-70 ℃ at 400-600 r/min to obtain modified silicon dioxide dispersion liquid;
s3, adding the modified silicon dioxide dispersion liquid into the slurry, and mixing for 30-60min under the stirring of 300-600r/min to obtain the modified silicon dioxide;
The pigment and filler at least comprises zinc oxide, wherein the zinc oxide accounts for 5-10% of the total mass of the pigment and filler; the particle size of the zinc oxide is 20-50nm;
The mass ratio of the slurry to the modified silicon dioxide dispersion liquid is (1-2): 1.
Preferably, the mass ratio of the aliphatic anionic polyurethane dispersion to the modified color paste is (50-70): (15-20).
Preferably, the mass ratio of the aliphatic anionic polyurethane dispersion to the modified color paste is 60:18.
The inventor discovers in the experimental process that the mass ratio of the aliphatic anionic polyurethane dispersoid to the modified color paste is controlled to be (50-70): and (15-20), the weather resistance and the wear resistance of the finish paint are improved and certain self-cleaning performance is achieved while the precipitation and sedimentation phenomena of the finish paint are avoided. The inventor guesses that the hydrophilic groups on the surface of the pigment and filler can be adsorbed on the hydrophilic end of the titanate coupling agent, the hydrophobic end of the titanate coupling agent has good compatibility with polyurethane dispersion, the pigment and filler can be uniformly dispersed in a paint film of a finish paint while sedimentation and precipitation are avoided, the weather resistance of the paint film of the finish paint is improved, meanwhile, silane modified silicon dioxide can be attached to the hydrophobic end of the titanate coupling agent, the surface energy and friction coefficient of the paint film of the finish paint are reduced, and the pigment and filler has a certain self-cleaning effect.
Preferably, the zinc oxide comprises 8% of the total mass of the pigment and filler.
Preferably, the pigment and filler can be at least one selected from titanium dioxide, iron oxide red, iron oxide brown, iron oxide orange, iron oxide yellow, cobalt green, ultramarine blue and cobalt blue.
Preferably, the particle size of the zinc oxide is 25+ -5 nm.
Preferably, the mass ratio of the pigment to the filler to the deionized water to the isopropanol to the titanate coupling agent is (15-35): (55-85): (3-8): (0.5-1.5).
Preferably, the titanate coupling agent is a chelate type titanate coupling agent.
Preferably, the mass ratio of the slurry to the modified silica dispersion is 1.5:1.
As the polyurethane dispersoid is used as the film forming resin, the finishing paint is used in the building field, the finishing paint is inevitably yellow due to sun exposure, the appearance is affected, the inventor controls in the experimental process, when the particle size of zinc oxide is controlled to be 20-50nm, the zinc oxide accounts for 5-10% of the total mass of pigment and filler, and the mass ratio of slurry to modified silicon dioxide dispersion liquid is (1-2): 1, preferably 1.5:1, the self-cleaning performance of the finish paint is improved, and meanwhile, the weather resistance of the finish paint is improved, so that the finish paint is prevented from yellowing caused by sun exposure when being used in the field of construction, in particular to a detachable container house. The inventor conjectures that the silane modified silicon dioxide can be attached to the hydrophobic end of the titanate coupling agent to the greatest extent under the condition, so that the surface energy and friction coefficient of the finish paint are reduced, meanwhile, the nano zinc oxide in the slurry improves the compactness of the finish paint, and the nano zinc oxide and the silicon dioxide inhibit photooxidation, so that the yellowing of the finish paint is avoided.
Preferably, the particle size of the silica is 10-30nm, preferably 15+ -5 nm.
Preferably, the preparation method of the silane coupling agent solution comprises the following steps: firstly, regulating the pH of an ethanol water solution (the volume ratio of ethanol to water is 95:5) to be 4.5-5.5 by using acetic acid, and then adding a silane coupling agent (the volume ratio of the silane coupling agent to the ethanol water solution is 2:100) to hydrolyze for 3-5min to obtain the aqueous ethanol solution.
Preferably, the mass ratio of the silicon dioxide to the silane coupling agent is 100: (0.5-1), preferably 100:0.8.
Preferably, the silane coupling agent is at least one selected from gamma-aminopropyl triethoxysilane, 3-mercaptopropyl triethoxysilane, gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane and gamma-methacryloxypropyl trimethoxysilane, and is preferably 3-mercaptopropyl triethoxysilane.
Preferably, the aliphatic anionic polyurethane dispersion comprises a polyester-polycarbonate polyurethane dispersion and a polyether polyurethane dispersion; the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyester dispersion is (1.5-3) 1.
Preferably, the solids content of the polyester-polycarbonate polyurethane dispersion is 30 to 40 wt.%, preferably 35.+ -. 1 wt.%.
Preferably, the polyether polyurethane dispersion has a solids content of 40 to 60% by weight, preferably 50.+ -. 1% by weight.
Preferably, the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyester dispersion is (2-3): 1, preferably 2.5:
The application selects the aliphatic anion type polyester polyurethane dispersoid as film forming resin, the obtained finish paint has good adhesive force and wear resistance when being used for coil steel, but the existing ester groups are easy to hydrolyze, and the building field, especially the detachable container house, cannot meet the requirement of excellent water resistance, in order to solve the problems, the application tries to select the aliphatic anion type polyester-polycarbonate polyurethane dispersoid as film forming resin, but discovers that the finish paint obtained by singly using the polyester-polycarbonate polyurethane dispersoid with the solid content of 30-40wt% is still sensitive to water and poor in wet heat resistance due to the existence of potential hydrolytic groups such as ester groups, carbonate groups, urethane groups and the like, and for this reason, the application introduces the aliphatic anion type polyether polyurethane dispersoid, and unexpectedly discovers that only when the mass ratio of the polyester-polycarbonate polyurethane dispersoid to the polyether polyurethane dispersoid is controlled to be (1.5-3): 1, especially (2-3): 1, the obtained finish paint has good wet heat resistance and wear resistance. The inventors hypothesize that the reason is that when the polyester-polycarbonate polyurethane dispersion is too much, it causes the top coat to be too soft, causing the paint film to be not abrasion-resistant and affecting the wet heat resistance of the paint film, and when the polyester-polycarbonate polyurethane dispersion is too little, it also causes the paint film to be degraded in abrasion resistance.
Preferably, the blocked isocyanate is a blocked aliphatic polyisocyanate.
Preferably, the blocked aliphatic polyisocyanate has a solids content of 35 to 45wt%, a blocked NCO content of 6 to 12%, preferably a solids content of 40.+ -. 2%, and an NCO content of 8.2%.
Preferably, the mass ratio of the aliphatic anionic polyurethane dispersion to the blocked isocyanate is (50-70): (4-6), preferably 60:5.
The application introduces the blocked isocyanate, which can effectively improve the hardness and solvent resistance of the finish paint, but the inventor unexpectedly discovers that when the solid content of the blocked aliphatic polyisocyanate is 35-45wt%, the blocked NCO content is 6-12%, and the mass ratio of the aliphatic anionic polyurethane dispersoid to the blocked isocyanate is controlled to be (50-70): (5-6) while improving the adhesion and solvent resistance of the topcoat, the inventors hypothesize that the deterioration of the flexibility of the topcoat is avoided because excessive crosslinking of the topcoat is caused when the blocked isocyanate is excessive, resulting in a decrease in the elongation of the paint film and a decrease in the flexibility.
Preferably, the auxiliary agent is at least one selected from defoamer, flatting agent and lubricant.
Preferably, the auxiliary agent is a combination of an antifoaming agent, a leveling agent and a lubricant.
Preferably, the mass ratio of the defoamer, the leveling agent and the lubricant is 1:1: (1-2), preferably 1:1:1.5.
Preferably, the defoaming agent is at least one selected from polyether defoaming agents, organic silicon defoaming agents and alcohol defoaming agents.
Preferably, the leveling agent is at least one selected from polyether siloxane, polyether modified dimethyl siloxane, polyester modified polysiloxane and acrylic ester.
Preferably, the lubricant is a wax emulsion.
Preferably, the wax emulsion is selected from a polyethylene wax emulsion or a polytetrafluoroethylene wax emulsion, preferably a polyethylene wax emulsion.
Preferably, the polyethylene wax emulsion has a solid content of 30-40wt%, an average particle size of 0.05-0.1 [ mu ] m, preferably a solid content of 35+ -1 wt%, and an average particle size of 0.06 [ mu ] m.
According to the application, polyethylene wax emulsion with solid content of 30-40wt% and average particle diameter of 0.05-0.1 mu m is introduced, and the mass ratio of defoamer, flatting agent and lubricant is controlled to be 1:1: (1-2) the abrasion resistance and self-cleaning property of the finish paint can be further improved.
The application provides a preparation method of wear-resistant water-based finish paint applied to coil steel, which comprises the following steps: and (3) stirring deionized water and the aliphatic anion polyurethane dispersoid for dispersion, sequentially adding the closed isocyanate, the auxiliary agent and the modified color paste at the rotating speed of 300-700r/min, and uniformly stirring to obtain the polyurethane dispersion.
Advantageous effects
1. The application introduces an aliphatic anion type polyether polyurethane dispersion, and controls the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyurethane dispersion to be (1.5-3): 1, especially (2-3): 1, the obtained finish paint has good wet heat resistance and wear resistance.
2. The modified color paste introduced by the application can avoid precipitation and sedimentation of the finish paint, and simultaneously improve the weather resistance and wear resistance of the finish paint and has certain self-cleaning property.
3. The application controls the particle size of zinc oxide to be 20-50nm, the zinc oxide accounts for 5-10% of the total mass of pigment and filler, and the mass ratio of slurry to modified silicon dioxide dispersion liquid is (1-2): 1, preferably 1.5:1, the self-cleaning performance of the finish paint is improved, and meanwhile, the weather resistance of the finish paint is improved, so that the finish paint is prevented from yellowing caused by sun exposure when being used in the field of construction, in particular to a detachable container house.
4. The solid content of the blocked aliphatic polyisocyanate is 35-45wt%, the blocked NCO content is 6-12%, and the mass ratio of the aliphatic anionic polyurethane dispersion to the blocked isocyanate is controlled to be (50-70): (5-6) while improving the adhesion and solvent resistance of the topcoat, deterioration in the flexibility of the topcoat can be avoided.
5. According to the application, polyethylene wax emulsion with solid content of 30-40wt% and average particle diameter of 0.05-0.1 mu m is introduced, and the mass ratio of defoamer, flatting agent and lubricant is controlled to be 1:1: (1-2) the abrasion resistance and self-cleaning property of the finish paint can be further improved.
Detailed Description
In order to better explain the present application, the technical solutions in the embodiments of the present application will be clearly and completely described in the following in conjunction with examples in the embodiments of the present application, and the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
Example 1
The embodiment 1 provides a wear-resistant water-based finish paint applied to coil steel, which comprises the following components in parts by mass: 60 parts of aliphatic anion polyurethane dispersoid, 18 parts of modified color paste, 5 parts of closed isocyanate, 7 parts of auxiliary agent and 15 parts of deionized water;
the preparation method of the modified color paste comprises the following steps:
s1: mixing pigment and filler, deionized water and isopropanol, adding titanate coupling agent, and modifying at 1000r/min and 60 ℃ for 50min to obtain slurry;
s2, placing silicon dioxide in a silane coupling agent solution, and modifying for 1.5 hours at the temperature of 500 r/min and 60 ℃ to obtain modified silicon dioxide dispersion liquid;
s3, adding the modified silicon dioxide dispersion liquid into the slurry, and mixing for 45min under the stirring of 500r/min to obtain the modified silicon dioxide;
The pigment and filler is zinc oxide and titanium dioxide, and the zinc oxide accounts for 8% of the total mass of the pigment and filler; the particle size of the zinc oxide is 25+ -5 nm, purchased from Guangzhou Mao materials science and technology Co., ltd., model: z713;
The titanium dioxide is purchased from Anhui An Nada titanium industry Co., ltd., model: ATR-311;
the mass ratio of the slurry to the modified silicon dioxide dispersion liquid is 1.5:1.
The mass ratio of the pigment to filler to deionized water to isopropanol to titanate coupling agent is 30:65:4:1.
The titanate coupling agent is a chelate type titanate coupling agent, and is purchased from the resin Limited company, model number of Yangzhou City: LD-311.
The particle size of the silicon dioxide is 15+/-5 nm, and the silicon dioxide is purchased from Guangzhou Hongwu materials science and technology Co., ltd., model: m600.
The preparation method of the silane coupling agent solution comprises the following steps: firstly, regulating the pH of an ethanol water solution (the volume ratio of ethanol to water is 95:5) to be 5 by using acetic acid, and then adding a silane coupling agent (the volume ratio of the silane coupling agent to the ethanol water solution is 2:100) to hydrolyze for 5min to obtain the aqueous ethanol solution.
The mass ratio of the silicon dioxide to the silane coupling agent is 100:0.8.
The silane coupling agent is 3-mercaptopropyl triethoxysilane.
The aliphatic anionic polyurethane dispersion comprises a polyester-polycarbonate polyurethane dispersion and a polyether polyurethane dispersion; the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyester dispersion is 2.5:1.
The solid content of the polyester-polycarbonate polyurethane dispersion is 35+/-1 weight percent, and the model is as follows: bayhydrol UH 2648/1.
The polyether polyurethane dispersion has a solid content of 50+/-1 wt% and is of the type: wanhua chemistry Archsol 8355.
The blocked isocyanate is a blocked aliphatic polyisocyanate.
The solid content of the closed aliphatic polyisocyanate is 40+/-2%, the NCO content is 8.2% and the type is: kesi created Bayhydur BL XP 2706.
The auxiliary agent is a combination of a defoaming agent, a leveling agent and a lubricant.
The mass ratio of the defoaming agent to the leveling agent to the lubricant is 1:1:1.5.
The defoaming agent is an organosilicon defoaming agent, and the model is as follows: pick BYK-093.
The leveling agent is polyether modified dimethyl siloxane, and the model is as follows: pick BYK333.
The lubricant is a wax emulsion.
The wax emulsion is polyethylene wax emulsion.
The solid content of the polyethylene wax emulsion is 35+/-1 wt%, the average grain diameter is 0.06 mu m, and the polyethylene wax emulsion is purchased from Dongguan city Xu Hua new material science and technology Co., ltd., model: XH-607.
A preparation method of wear-resistant water-based finish paint applied to coil steel comprises the following steps: and (3) stirring deionized water and the aliphatic anionic polyurethane dispersoid for dispersion, sequentially adding the closed isocyanate, the defoamer, the flatting agent, the lubricant and the modified color paste at the rotating speed of 500r/min, and uniformly stirring to obtain the polyurethane foam.
Example 2
Example 2 provides a wear-resistant water-based finish paint applied to coil steel, which comprises the following components in parts by mass: 50 parts of aliphatic anion polyurethane dispersoid, 15 parts of modified color paste, 4 parts of closed isocyanate, 5 parts of auxiliary agent and 12 parts of deionized water;
the preparation method of the modified color paste comprises the following steps:
s1: mixing pigment and filler, deionized water and isopropanol, adding titanate coupling agent, and modifying at 1000r/min and 60 ℃ for 50min to obtain slurry;
s2, placing silicon dioxide in a silane coupling agent solution, and modifying for 1.5 hours at the temperature of 500 r/min and 60 ℃ to obtain modified silicon dioxide dispersion liquid;
s3, adding the modified silicon dioxide dispersion liquid into the slurry, and mixing for 45min under the stirring of 500r/min to obtain the modified silicon dioxide;
The pigment and filler is zinc oxide and titanium dioxide, and the zinc oxide accounts for 8% of the total mass of the pigment and filler; the particle size of the zinc oxide is 25+ -5 nm, purchased from Guangzhou Mao materials science and technology Co., ltd., model: z713;
The titanium dioxide is purchased from Anhui An Nada titanium industry Co., ltd., model: ATR-311;
the mass ratio of the slurry to the modified silicon dioxide dispersion liquid is 1.5:1.
The mass ratio of the pigment to filler to deionized water to isopropanol to titanate coupling agent is 30:65:4:1.
The titanate coupling agent is a chelate type titanate coupling agent, and is purchased from the resin Limited company, model number of Yangzhou City: LD-311.
The particle size of the silicon dioxide is 15+/-5 nm, and the silicon dioxide is purchased from Guangzhou Hongwu materials science and technology Co., ltd., model: m600.
The preparation method of the silane coupling agent solution comprises the following steps: firstly, regulating the pH of an ethanol water solution (the volume ratio of ethanol to water is 95:5) to be 5 by using acetic acid, and then adding a silane coupling agent (the volume ratio of the silane coupling agent to the ethanol water solution is 2:100) to hydrolyze for 5min to obtain the aqueous ethanol solution.
The mass ratio of the silicon dioxide to the silane coupling agent is 100:0.8.
The silane coupling agent is 3-mercaptopropyl triethoxysilane.
The aliphatic anionic polyurethane dispersion comprises a polyester-polycarbonate polyurethane dispersion and a polyether polyurethane dispersion; the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyester dispersion is 2.5:1.
The solid content of the polyester-polycarbonate polyurethane dispersion is 35+/-1 weight percent, and the model is as follows: bayhydrol UH 2648/1.
The polyether polyurethane dispersion has a solid content of 50+/-1 wt% and is of the type: wanhua chemistry Archsol 8355.
The blocked isocyanate is a blocked aliphatic polyisocyanate.
The solid content of the closed aliphatic polyisocyanate is 40+/-2%, the NCO content is 8.2% and the type is: kesi created Bayhydur BL XP 2706.
The auxiliary agent is a combination of a defoaming agent, a leveling agent and a lubricant.
The mass ratio of the defoaming agent to the leveling agent to the lubricant is 1:1:1.5.
The defoaming agent is an organosilicon defoaming agent, and the model is as follows: pick BYK-093.
The leveling agent is polyether modified dimethyl siloxane, and the model is as follows: pick BYK333.
The lubricant is a wax emulsion.
The wax emulsion is polyethylene wax emulsion.
The solid content of the polyethylene wax emulsion is 35+/-1 wt%, the average grain diameter is 0.06 mu m, and the polyethylene wax emulsion is purchased from Dongguan city Xu Hua new material science and technology Co., ltd., model: XH-607.
A preparation method of wear-resistant water-based finish paint applied to coil steel comprises the following steps: and (3) stirring deionized water and the aliphatic anionic polyurethane dispersoid for dispersion, sequentially adding the closed isocyanate, the defoamer, the flatting agent, the lubricant and the modified color paste at the rotating speed of 500r/min, and uniformly stirring to obtain the polyurethane foam.
Example 3
Example 3 provides a wear-resistant water-based finish paint applied to coil steel, which comprises the following components in parts by mass: 70 parts of aliphatic anion polyurethane dispersoid, 20 parts of modified color paste, 6 parts of closed isocyanate, 8 parts of auxiliary agent and 18 parts of deionized water;
the preparation method of the modified color paste comprises the following steps:
s1: mixing pigment and filler, deionized water and isopropanol, adding titanate coupling agent, and modifying at 1000r/min and 60 ℃ for 50min to obtain slurry;
s2, placing silicon dioxide in a silane coupling agent solution, and modifying for 1.5 hours at the temperature of 500 r/min and 60 ℃ to obtain modified silicon dioxide dispersion liquid;
s3, adding the modified silicon dioxide dispersion liquid into the slurry, and mixing for 45min under the stirring of 500r/min to obtain the modified silicon dioxide;
The pigment and filler is zinc oxide and titanium dioxide, and the zinc oxide accounts for 8% of the total mass of the pigment and filler; the particle size of the zinc oxide is 25+ -5 nm, purchased from Guangzhou Mao materials science and technology Co., ltd., model: z713;
The titanium dioxide is purchased from Anhui An Nada titanium industry Co., ltd., model: ATR-311;
the mass ratio of the slurry to the modified silicon dioxide dispersion liquid is 1.5:1.
The mass ratio of the pigment to filler to deionized water to isopropanol to titanate coupling agent is 30:65:4:1.
The titanate coupling agent is a chelate type titanate coupling agent, and is purchased from the resin Limited company, model number of Yangzhou City: LD-311.
The particle size of the silicon dioxide is 15+/-5 nm, and the silicon dioxide is purchased from Guangzhou Hongwu materials science and technology Co., ltd., model: m600.
The preparation method of the silane coupling agent solution comprises the following steps: firstly, regulating the pH of an ethanol water solution (the volume ratio of ethanol to water is 95:5) to be 5 by using acetic acid, and then adding a silane coupling agent (the volume ratio of the silane coupling agent to the ethanol water solution is 2:100) to hydrolyze for 5min to obtain the aqueous ethanol solution.
The mass ratio of the silicon dioxide to the silane coupling agent is 100:0.8.
The silane coupling agent is 3-mercaptopropyl triethoxysilane.
The aliphatic anionic polyurethane dispersion comprises a polyester-polycarbonate polyurethane dispersion and a polyether polyurethane dispersion; the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyester dispersion is 2.5:1.
The solid content of the polyester-polycarbonate polyurethane dispersion is 35+/-1 weight percent, and the model is as follows: bayhydrol UH 2648/1.
The polyether polyurethane dispersion has a solid content of 50+/-1 wt% and is of the type: wanhua chemistry Archsol 8355.
The blocked isocyanate is a blocked aliphatic polyisocyanate.
The solid content of the closed aliphatic polyisocyanate is 40+/-2%, the NCO content is 8.2% and the type is: kesi created Bayhydur BL XP 2706.
The auxiliary agent is a combination of a defoaming agent, a leveling agent and a lubricant.
The mass ratio of the defoaming agent to the leveling agent to the lubricant is 1:1:1.5.
The defoaming agent is an organosilicon defoaming agent, and the model is as follows: pick BYK-093.
The leveling agent is polyether modified dimethyl siloxane, and the model is as follows: pick BYK333.
The lubricant is a wax emulsion.
The wax emulsion is polyethylene wax emulsion.
The solid content of the polyethylene wax emulsion is 35+/-1 wt%, the average grain diameter is 0.06 mu m, and the polyethylene wax emulsion is purchased from Dongguan city Xu Hua new material science and technology Co., ltd., model: XH-607.
A preparation method of wear-resistant water-based finish paint applied to coil steel comprises the following steps: and (3) stirring deionized water and the aliphatic anionic polyurethane dispersoid for dispersion, sequentially adding the closed isocyanate, the defoamer, the flatting agent, the lubricant and the modified color paste at the rotating speed of 500r/min, and uniformly stirring to obtain the polyurethane foam.
Comparative example 1
Comparative example 1 provides a wear resistant aqueous top coat for coil steel, which differs from example 1 in that the aliphatic anionic polyurethane dispersion is a polyester-polycarbonate polyurethane dispersion.
A preparation method of wear-resistant water-based finish paint applied to coil steel, and specific implementation modes thereof are the same as in example 1.
Comparative example 2
Comparative example 2 provides a wear resistant aqueous top coat for coil steel, which is different from example 1 in that the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyester dispersion is 4:1.
A preparation method of wear-resistant water-based finish paint applied to coil steel, and specific implementation modes thereof are the same as in example 1.
Comparative example 3
Comparative example 3 provides a wear resistant aqueous top coat for coil steel, which is different from example 1 in that the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyester dispersion is 1:1.
A preparation method of wear-resistant water-based finish paint applied to coil steel, and specific implementation modes thereof are the same as in example 1.
Comparative example 4
Comparative example 4 provides a wear-resistant water-based finish paint applied to coil steel, and the specific implementation mode is the same as example 1, except that the preparation method of the modified color paste comprises the following steps: mixing pigment and filler, deionized water and isopropanol, adding titanate coupling agent, and modifying at 1000r/min and 60 ℃ for 50 min.
A preparation method of wear-resistant water-based finish paint applied to coil steel, and specific implementation modes thereof are the same as in example 1.
Comparative example 5
Comparative example 5 provides a wear-resistant aqueous top coat for coil steel, which is different from example 1 in that the pigment and filler is titanium pigment.
A preparation method of wear-resistant water-based finish paint applied to coil steel, and specific implementation modes thereof are the same as in example 1.
Comparative example 6
Comparative example 6 provides a wear resistant aqueous top coat for coil steel, which differs from example 1 in that the mass ratio of slurry to modified silica dispersion is 3:1.
A preparation method of wear-resistant water-based finish paint applied to coil steel, and specific implementation modes thereof are the same as in example 1.
Comparative example 7
Comparative example 7 provides a wear resistant aqueous topcoat for coil steels, which differs from example 1 in that there is no blocked isocyanate.
A preparation method of wear-resistant water-based finish paint applied to coil steel, and specific implementation modes thereof are the same as in example 1.
Comparative example 8
Comparative example 8 provides a wear resistant aqueous top coat for coil steel, which is similar to example 1 in specific embodiment, except that the mass ratio of the aliphatic anionic polyurethane dispersion to the blocked isocyanate is 45:5.
Performance test: the items shown in table 1 were tested by applying a zinc-coated sheet coated with an epoxy primer (primer thickness 5 μm), applying a top-coat paint prepared in examples 1 to 3 and comparative examples 1 to 8 to a zinc-coated sheet by roll coating, baking at 160 ℃ for 10min, and coating film thickness 18 μm, and referring to the test method of GB/T13448-2019.
Table 1 test results
Among them, in particular, contamination resistance test: performing drop test by using carbon black solution as pollutant, and detecting color difference value delta E of the non-contaminated part and the contaminated part by a color difference meter without covering;
The operation method of the ultraviolet lamp accelerated aging test comprises the following steps: alternating light and condensation: the UVB-313 lamp tube has a cycle period of 8hr, wherein 4hr is ultraviolet irradiation, and the blackboard temperature is 60+ -3deg.C; 4hr is condensation, the blackboard temperature is 50+/-3 ℃, and after 1000 hours, whether the paint film is chalking or not is observed, and a color difference value delta E of an uncontaminated part and a contaminated part is detected by a color difference meter.
As can be seen from comparative examples 1 to 3 in Table 1, the kind of the aliphatic anionic polyurethane dispersion and the mass ratio of the polyester-polycarbonate polyurethane dispersion and the polyether polyester dispersion affect not only the wet heat resistance, abrasion resistance, but also the flexibility, adhesion, solvent resistance, abrasion resistance and scratch resistance of the topcoat.
As can be seen from comparative examples 4-6, the modified color paste prepared by the application has larger influence on the wear resistance, scratch resistance, pollution resistance and ultraviolet resistance of the finish paint, and has larger influence on the wet heat resistance.
As can be seen from comparative examples 7-8, the blocked isocyanate introduced by the present application has a relatively large influence on the adhesion, flexibility, solvent resistance and wet heat resistance of the topcoat, and also affects the abrasion resistance and scratch resistance of the topcoat.
The foregoing description of the embodiments of the present application should not be construed as limiting the scope of the application, but rather should be construed in view of the appended claims, as well as any equivalents thereof, or direct or indirect application in other relevant arts.
Claims (4)
1. The wear-resistant water-based finish paint for coil steel is characterized by comprising the following components in parts by mass: 40-80 parts of aliphatic anion polyurethane dispersoid, 10-25 parts of modified color paste, 5-10 parts of closed isocyanate, 1-10 parts of auxiliary agent and 10-20 parts of deionized water;
the preparation method of the modified color paste comprises the following steps:
s1: mixing pigment and filler, deionized water and isopropanol, adding titanate coupling agent, and modifying at 40-70 ℃ for 40-60min at 800-1200r/min to obtain slurry;
s2, placing silicon dioxide in a silane coupling agent solution, and modifying for 1-2 hours at the temperature of 50-70 ℃ at 400-600 r/min to obtain modified silicon dioxide dispersion liquid;
s3, adding the modified silicon dioxide dispersion liquid into the slurry, and mixing for 30-60min under the stirring of 300-600r/min to obtain the modified silicon dioxide;
The pigment and filler at least comprises zinc oxide, wherein the zinc oxide accounts for 5-10% of the total mass of the pigment and filler; the particle size of the zinc oxide is 20-50nm;
the mass ratio of the slurry to the modified silicon dioxide dispersion liquid is (1-2): 1, a step of;
the mass ratio of the aliphatic anionic polyurethane dispersoid to the modified color paste is (50-70): (15-20);
The aliphatic anionic polyurethane dispersion comprises a polyester-polycarbonate polyurethane dispersion and a polyether polyurethane dispersion;
The solid content of the polyester-polycarbonate polyurethane dispersion is 30-40wt%, and the solid content of the polyether polyurethane dispersion is 40-60wt%;
the mass ratio of the polyester-polycarbonate polyurethane dispersion to the polyether polyester dispersion is (1.5-3) 1;
The blocked isocyanate is blocked aliphatic polyisocyanate, the solid content of the blocked aliphatic polyisocyanate is 35-45wt% and the blocked NCO content is 6-12%;
the mass ratio of the aliphatic anionic polyurethane dispersion to the blocked isocyanate is 70:6-50:4.
2. The wear resistant aqueous top coat for coil steel according to claim 1, wherein said auxiliary agent is at least one selected from the group consisting of defoamers, leveling agents, lubricants.
3. The wear resistant aqueous top coat for coil steel according to claim 2, wherein said lubricant is a wax emulsion selected from the group consisting of polyethylene wax emulsion and polytetrafluoroethylene wax emulsion.
4. A method of preparing a wear resistant aqueous top coat for coil steel according to claim 3, comprising the steps of: and (3) stirring deionized water and the aliphatic anion polyurethane dispersoid for dispersion, sequentially adding the closed isocyanate, the auxiliary agent and the modified color paste at the rotating speed of 300-700r/min, and uniformly stirring to obtain the polyurethane dispersion.
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