CN114854294A - Self-cleaning waterborne polyurethane finish paint for environmental engineering vehicle and preparation method thereof - Google Patents
Self-cleaning waterborne polyurethane finish paint for environmental engineering vehicle and preparation method thereof Download PDFInfo
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- CN114854294A CN114854294A CN202210282491.8A CN202210282491A CN114854294A CN 114854294 A CN114854294 A CN 114854294A CN 202210282491 A CN202210282491 A CN 202210282491A CN 114854294 A CN114854294 A CN 114854294A
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- 239000003973 paint Substances 0.000 title claims abstract description 43
- 238000004140 cleaning Methods 0.000 title claims abstract description 38
- 230000007613 environmental effect Effects 0.000 title claims abstract description 35
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 28
- 239000004814 polyurethane Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000853 adhesive Substances 0.000 claims abstract description 16
- 230000001070 adhesive effect Effects 0.000 claims abstract description 16
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920002396 Polyurea Polymers 0.000 claims abstract description 15
- 239000005058 Isophorone diisocyanate Substances 0.000 claims abstract description 11
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 9
- 239000002270 dispersing agent Substances 0.000 claims abstract description 8
- 239000000945 filler Substances 0.000 claims abstract description 8
- 239000000049 pigment Substances 0.000 claims abstract description 8
- 239000000080 wetting agent Substances 0.000 claims abstract description 8
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000008367 deionised water Substances 0.000 claims abstract description 6
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 12
- 239000002562 thickening agent Substances 0.000 claims description 12
- 239000006185 dispersion Substances 0.000 claims description 10
- 229920006243 acrylic copolymer Polymers 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910021485 fumed silica Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 claims description 3
- QCAHUFWKIQLBNB-UHFFFAOYSA-N 3-(3-methoxypropoxy)propan-1-ol Chemical compound COCCCOCCCO QCAHUFWKIQLBNB-UHFFFAOYSA-N 0.000 claims description 3
- 229910002016 Aerosil® 200 Inorganic materials 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical group CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 9
- 239000005543 nano-size silicon particle Substances 0.000 abstract description 4
- 238000007665 sagging Methods 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 239000012752 auxiliary agent Substances 0.000 abstract description 3
- 241001448624 Miliaria Species 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- FEWFXBUNENSNBQ-UHFFFAOYSA-N 2-hydroxyacrylic acid Chemical compound OC(=C)C(O)=O FEWFXBUNENSNBQ-UHFFFAOYSA-N 0.000 abstract 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000001035 drying Methods 0.000 description 6
- 230000032683 aging Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000003670 easy-to-clean Effects 0.000 description 3
- UEEJHVSXFDXPFK-UHFFFAOYSA-O N-dimethylethanolamine Chemical compound C[NH+](C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-O 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000012972 dimethylethanolamine Substances 0.000 description 2
- 239000013538 functional additive Substances 0.000 description 2
- DMKSVUSAATWOCU-HROMYWEYSA-N loteprednol etabonate Chemical compound C1CC2=CC(=O)C=C[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@@](C(=O)OCCl)(OC(=O)OCC)[C@@]1(C)C[C@@H]2O DMKSVUSAATWOCU-HROMYWEYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 241001417527 Pempheridae Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- -1 aliphatic isocyanate Chemical class 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010415 tidying Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention belongs to the technical field of coatings, and particularly relates to a self-cleaning waterborne polyurethane finish paint for an environmental engineering vehicle and a preparation method thereof. The finish paint consists of a coating A and an adhesive B according to a weight ratio of 100 (18-20); wherein the coating A comprises aqueous hydroxy acrylic acid copolymer dispersoid, a flatting agent, a wetting agent, a dispersing agent, a pH value regulator, a film-forming auxiliary agent, a defoaming agent, pigment and filler, gas-phase nano silicon dioxide, a polyurea rheological agent, a special functional auxiliary agent, deionized water and the like; the adhesive B consists of IPDI isophorone diisocyanate and propylene glycol methyl ether acetate. The finish paint provided by the invention has excellent anti-sagging performance, has a thick film formed at one time, does not have the defects of miliaria and dark bubbles, and well solves the technical problems of poor fullness and appearance of the water-based paint caused by low solid content in construction; and has self-cleaning function.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a self-cleaning waterborne polyurethane finish paint for an environmental engineering vehicle and a preparation method thereof.
Background
The environment engineering vehicle is a special vehicle widely used for tidying and cleaning urban appearance. The sanitation truck mainly comprises a watering cart, a garbage truck, a sewage suction truck, a road cleaning truck, a kitchen recycling truck, a snow sweeper and the like. Sanitation workers can realize cleaning and cleanness keeping of urban environment by controlling the sanitation vehicle, and good living environment is provided for people.
Due to the fact that the outdoor operation is carried out for a long time, the outdoor operation is often affected by rainwater insolation, corrosive media and the like, if the surface of the outdoor operation is not protected, the carriage is exposed, the carriage is corroded due to contact with the corrosive media in the environment, and the attractiveness and normal use of the carriage are affected. Therefore, in order to prolong the service life of the environmental engineering vehicle, a paint film is required to be coated on the surface of the environmental engineering vehicle. The paint has the characteristics of good fullness, good medium resistance, self-cleaning property, excellent weather resistance, high hardness and strong adhesive force, and under the background, the development of the paint with high fullness and self-cleaning function has feasibility.
In addition, national environmental policy and emission control on Volatile Organic Compounds (VOC) are getting tighter and tighter, and the water-based finish paint has the problems of slow drying, poor fullness and easy sagging during construction. But the drying speed is improved, and the defects of miliaria, dark bubbles and the like are easily generated when the water-based finish paint is baked; the high-grade environmental engineering vehicle not only requires the coating to have good construction performance, but also requires the coating to have good appearance, decoration, comprehensive mechanical property, water resistance, aging resistance, acid and alkali resistance. At present, the existing two-component water-based finish paint can not meet the coating requirements, and sagging occurs when the thickness of one-time thick coating exceeds 50 mu m. Therefore, the invention provides the following two solutions: 1) the reasonable matching of the gas-phase nano silicon dioxide and the special polyurea rheological agent is adopted, and the coating does not sag when the construction solid content is about 35 percent and the wet film thickness is 150 mu m, so that the coating is suitable for the surface coating of the environmental engineering truck with a complex shape. 2) The special functional auxiliary agent is adopted to reduce the surface energy, so that the coating has a self-cleaning function, is easy to clean and is beneficial to appearance and appearance of a city.
Disclosure of Invention
The invention provides a self-cleaning waterborne polyurethane finish paint for an environmental engineering truck and a preparation method thereof, aiming at solving the problems of slow drying, poor fullness, easy sagging during construction, no aging resistance, difficult cleaning and the like of a waterborne finish paint in the prior art.
The invention provides a self-cleaning waterborne polyurethane finish paint for an environmental engineering truck, which is prepared from the following raw materials in parts by weight: coating A: 100 parts of an adhesive B (18-20);
the coating A is prepared from the following raw materials in percentage by weight: 55-60% of water-based hydroxyl acrylic copolymer dispersoid, 0.1-0.3% of flatting agent, 0.2-0.3% of wetting agent, 1.0-2.0% of dispersing agent, 0.4-0.6% of pH value regulator, 2.0-2.5% of film-forming assistant, 0.2-0.5% of defoaming agent, 2.0-5.0% of hydrophobic agent, 0.5-0.8% of nonionic associative thickener, 20-25% of pigment and filler, 1.0-1.5% of polyurea rheological agent, 0.1-0.5% of fumed silica and 100% of deionized water.
The adhesive B is prepared from the following raw materials in percentage by weight: 40-60% of isophorone diisocyanate (IPDI) prepolymer and 40-60% of propylene glycol methyl ether acetate.
Preferably, the hydroxyl content of the aqueous hydroxy acrylic copolymer dispersoid is 3.8-4.2%, the solid content is 50-54%, and the particle size is less than or equal to 60 nm. The aqueous hydroxyacrylic acid copolymer dispersion is Bayhydrol A XP2695 (the brand is Bayer, and the model is Bayhydrol A XP 2695).
Preferably, the leveling agent is one or two of BYK 333 (the brand is German Bike, the model is BYK 333) and TEGO 450 (the brand is Digao, the model is TEGO 450).
Preferably, the wetting agent is 104E (make air chemistry, model 104E).
Preferably, the dispersant is Dispers755W, (diko brand, Dispers 755W).
Preferably, the pH adjuster is N, N-Dimethylethanolamine (DMEA) (brand basf, germany, model DMEA).
Preferably, the coalescent is one or both of dipropylene glycol butyl ether (DPNB) and dipropylene glycol monomethyl ether (DPM) (brand dow).
Preferably, the defoaming agent is an organic silicon defoaming agent, and the type is one or two of BYK028 (the brand is German bike, the model is BYK028), TEGO Foamex 810 (the brand is digao, the model is TEGO Foamex 810), TEGO Airex 902W (the brand is digao, the model is TEGO Airex 902W).
Preferably, the hydrophobic agent is TEGO PROTECT 5100 (Digao brand, TEGO PROTECT 5100).
Preferably, the nonionic associative thickener is
U300 (Brand of Wanhua, model number of Wanhua)
U300)。
Preferably, the polyurea rheology agent is BYK420 (model BYK420, bib, germany).
Preferably, the fumed nanosilica is fumed silica AEROSIL 200 (the brand is winning woundplast, the model is fumed silica AEROSIL 200).
Preferably, the pigment and filler is titanium dioxide R706 (the brand is U.S. DuPont, the model is R706).
Preferably, the isophorone diisocyanate (IPDI) prepolymer IPDI (brand is basf, model is IPDI).
Correspondingly, the invention also provides a preparation method of the self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle, which specifically comprises the following steps:
s1, putting deionized water, a wetting agent, a dispersing agent and a pH value regulator into a dispersion cylinder according to the formula ratio, uniformly dispersing, slowly adding a defoaming agent, a pigment filler and gas-phase nano-silica, pre-dispersing for 20-30 min at the rotating speed of 200-400 rpm, and grinding the pre-dispersed mixture to be less than 15 mu m by using a sand mill to obtain the water-based color paste;
s2, putting the aqueous hydroxyl acrylic copolymer dispersoid, the leveling agent and the film-forming assistant in the formula ratio into a paint preparation cylinder for uniform dispersion, then adding the aqueous color paste, dispersing for 10-20 min at the rotating speed of 500-700 rpm, then adding the polyurea rheological agent and the nonionic associative thickener, dispersing for 5-10 min, and filtering to obtain the coating A;
s3, uniformly mixing isophorone diisocyanate (IPDI) prepolymer and propylene glycol monomethyl ether acetate according to formula amount, and filtering to obtain an adhesive B;
s4, mixing and stirring the coating A and the adhesive B uniformly according to the proportion to obtain the self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle.
The invention relates to a self-cleaning waterborne polyurethane finish for an environmental engineering vehicle and a preparation method thereof, and the inventive concept of the self-cleaning waterborne polyurethane finish is as follows: firstly, the invention adopts the high-solid-content water-based hydroxyl acrylic copolymer dispersoid with the hydroxyl content of 3.8-4.2% and the particle size of less than or equal to 60nm as the base resin, and adds a proper amount of hydrophobic agent, so that the drying speed, the glossiness and the fullness of the coating can be improved, and the obtained coating has the advantages of good mechanical property, high hardness, stain resistance and good adhesion with a base material.
Secondly, the non-ionic associative thickener and the polyurea rheological agent are compounded, and the polyurea rheological agent is taken as the main component, so that the viscosity of the coating A is greatly improved; the strong pseudoplastic nonionic associative thickener is used as an auxiliary, so that the coating A has higher thixotropy, and the construction performance cannot be influenced due to the sharp increase of the viscosity of the coating after the coating is prepared.
In addition, isophorone diisocyanate (IPDI) is compounded to be used as the adhesive B, IPDI is one of the varieties with the minimum activity in common diisocyanate products, the reaction is stable, two isocyanate groups of the IPDI have different reactivity about ten times, and partial IPDI tripolymer is added into the linear aliphatic isocyanate-based double-component polyurethane coating, so that the drying property, the surface hardness, the application period and the environment corrosion resistance can be improved. The pot life of the coating formula system is longer than 6h, the coating has proper viscosity, thixotropy and good construction performance in the pot life after paint preparation, and the coating does not sag and has high surface drying speed even if the coating is constructed under the low-temperature and high-humidity environment conditions that the temperature is 5-15 ℃ and the humidity is higher than 95%.
Therefore, compared with the prior art, the invention has the following advantages:
(1) the self-cleaning waterborne polyurethane finish paint for the environmental engineering truck adopts the reasonable matching of the gas-phase nano silicon dioxide and the special polyurea rheological agent, does not sag when the construction solid content is about 35 percent and the wet film thickness is 150 mu m, and is suitable for the surface coating of the environmental engineering truck with a complex shape.
(2) The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle adopts special functional additives, reduces the surface energy, enables the coating to have a self-cleaning function, is easy to clean and is beneficial to city appearance and city appearance.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The invention relates to a formula of a self-cleaning waterborne polyurethane finish for an environmental engineering vehicle and a preparation method thereof
The embodiment of the invention uses the following raw materials with brands and types:
as shown in table 1 below, a weight ratio table is presented for 5 examples of topcoats of the present invention.
TABLE 1 topcoat formulations of inventive examples 1-5
The preparation method of the finish paint of the embodiment 1-5 comprises the following steps:
s1, putting deionized water, a wetting agent, a dispersing agent and a pH value regulator into a dispersion cylinder according to the formula ratio, uniformly dispersing, slowly adding a defoaming agent, a pigment filler and gas-phase nano-silica, pre-dispersing for 20-30 min at the rotating speed of 200-400 rpm, and grinding the pre-dispersed mixture to be less than 15 mu m by using a sand mill to obtain the water-based color paste;
s2, putting the aqueous hydroxyl acrylic copolymer dispersoid, the leveling agent and the film-forming assistant in the formula ratio into a paint preparation cylinder for uniform dispersion, then adding the aqueous color paste, dispersing for 10-20 min at the rotating speed of 500-700 rpm, then adding the polyurea rheological agent and the nonionic associative thickener, dispersing for 5-10 min, and filtering to obtain the coating A;
s3, uniformly mixing isophorone diisocyanate (IPDI) prepolymer and propylene glycol monomethyl ether acetate according to formula amount, and filtering to obtain an adhesive B;
s4, mixing and stirring the coating A and the adhesive B uniformly according to the proportion to obtain the self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle. Test example I, performance detection of self-cleaning waterborne polyurethane finish paint for environmental engineering vehicle
The performances of the finish paints and the coatings thereof in examples 1-5 are tested, and the results are shown in the following table 2.
Table 2 Performance test results of the topcoats of the examples
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Mass solids content% | 47 | 47.6 | 48.9 | 48.5 | 47.5 |
| Viscosity, S | 46 | 48 | 53 | 52 | 50 |
| Pot life, h | 6 | 6.5 | 6.5 | 6.5 | 6 |
| Sag resistance, μm | 150 | 153 | 158 | 160 | 162 |
| Gloss, 60 ° | 93 | 93.6 | 94 | 94.2 | 92.9 |
| Paint film surface | Smooth without dark bubble | Smooth without dark bubble | Smooth without dark bubble | Smooth without dark bubble | Smooth without dark bubble |
| Hardness of pencil | 3H | 3H | 3H | 3H | 3H |
| Adhesion force, grade | 0 | 0 | 0 | 0 | 0 |
| Flexibility, mm | 1 | 1 | 1 | 1 | 1 |
| Impact resistance, kg.cm | ＞50 | ＞50 | ＞50 | ＞50 | ＞50 |
| Aging resistance (2000h) | Level 0 | Level 0 | Level 0 | Level 0 | Level 0 |
| Water resistance, h | ＞720h | ＞720h | ＞720h | ＞720h | ＞720h |
From table 2 above, it can be seen that:
(1) the self-cleaning waterborne polyurethane finish paint for the environmental engineering truck adopts the reasonable matching of the gas-phase nano silicon dioxide and the special polyurea rheological agent, does not sag when the construction solid content is about 35 percent and the wet film thickness is 150 mu m, and is suitable for the surface coating of the environmental engineering truck with a complex shape.
(2) The self-cleaning waterborne polyurethane finish paint for the environmental engineering truck adopts special functional additives, reduces the surface energy, ensures that the coating has a self-cleaning function, is easy to clean, is beneficial to the appearance of a city, has high hardness, strong adhesive force, excellent impact resistance, stain resistance, weather resistance and water resistance, and can meet the requirement of good application on the environmental engineering truck. In examples 1-5, the overall performance of the topcoat paint of example 4 is the best, so example 4 is the best embodiment of the invention.
In addition, research comparative tests were conducted, some of which were as follows:
comparative example 1
On the basis of the example 1, the fumed nano-silica is replaced by the same amount of bentonite, and other components and preparation methods are consistent with the example 1. As a result, 60 ℃ gloss was reduced to 81, and sag resistance was 80 μm. Indicating a decrease in gloss and poor sag resistance.
Comparative example 2
On the basis of example 1, the special polyurea rheological agent is replaced by an equivalent amount of alkali swelling thickener (model: DR-50, manufacturer: Dow chemical), and other components and preparation methods are the same as those of example 1. The results show poor water resistance.
Comparative example 3
On the basis of the example 1, the dosage of the special polyurea rheological agent is adjusted to be 3 percent, the dosage of the fumed nanometer silica is adjusted to be 0.6 percent, and the dosages of other components and the preparation method are consistent with those of the example 1. As a result, the viscosity increases and the pot life decreases.
Comparative example 4
On the basis of example 1, the aqueous hydroxyacrylic copolymer dispersion was replaced by an equivalent amount of a dispersion having a hydroxyl group content of 1.8% (dispersion model: DB3618, manufacturer: Hubei double bond chemistry), the other components and the preparation method being in accordance with example 1. The results showed a pencil hardness of HB.
Comparative example 5
On the basis of example 1, the nonionic associative thickener was replaced with an equivalent amount of an alkali swelling thickener (model: DR-50, manufacturer: Dow chemical). The other components and the preparation were identical to example 1. The results show a decrease in water resistance.
Comparative example 6
In addition to example 1, the adhesive B used only isophorone diisocyanate prepolymer and no propylene glycol methyl ether acetate was added. The other components and the preparation were identical to example 1. The results showed a decrease in flexibility.
Comparative example 7
On the basis of example 1, the adhesion agent B replaces the isophorone diisocyanate prepolymer with an equivalent amount of HDI prepolymer, and the other components and the preparation method are the same as those in example 1. The results show an aging resistance of only 1000 h.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle is characterized by comprising the following raw materials in parts by weight: 100 parts of coating A and 18-20 parts of adhesive B;
the coating A is prepared from the following raw materials in percentage by weight: 55-60% of water-based hydroxyl acrylic copolymer dispersoid, 0.1-0.3% of flatting agent, 0.2-0.3% of wetting agent, 1.0-2.0% of dispersing agent, 0.4-0.6% of pH value regulator, 2.0-2.5% of film-forming assistant, 0.2-0.5% of defoaming agent, 2.0-5.0% of hydrophobic agent, 0.5-0.8% of nonionic associative thickener, 20-25% of pigment and filler, 1.0-1.5% of polyurea rheological agent, 0.1-0.5% of fumed silica and 100% of deionized water;
the adhesive B is prepared from the following raw materials in percentage by weight: 40-60% of isophorone diisocyanate prepolymer and 40-60% of propylene glycol methyl ether acetate.
2. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in claim 1, wherein the hydroxyl content of the waterborne hydroxyl acrylic copolymer dispersoid is 3.8-4.2%, the solid content is 50-54%, and the particle size is less than or equal to 60 nm.
3. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in claim 1, wherein the leveling agent is one or two of BYK 333 and TEGO 450;
the wetting agent is air chemistry 104E;
the dispersant is digao Dispers 755W.
4. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in claim 1, wherein the pH value regulator is N, N-dimethylethanolamine.
5. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in claim 1, wherein the film-forming assistant is one or two of dipropylene glycol butyl ether and dipropylene glycol monomethyl ether.
6. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in claim 1, wherein the defoaming agent is one or two of BYK028, DigaFoamex 810 and DigaAirex 902W.
7. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in claim 1, wherein the hydrophobic agent is one or two of TEGO Protect 5100 and BYK 3700;
the nonionic associative thickener is
U300。
8. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in claim 1, wherein the polyurea rheological agent is BYK 420.
9. The self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in claim 1, wherein the fumed nano-silica is white carbon black AEROSIL 200; the pigment filler is titanium dioxide R706.
10. The preparation method of the self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:
s1, putting deionized water, a wetting agent, a dispersing agent and a pH value regulator into a dispersion cylinder according to the formula ratio, uniformly dispersing, slowly adding a defoaming agent, a pigment filler and gas-phase nano-silica, pre-dispersing for 20-30 min at the rotating speed of 200-400 rpm, and grinding the pre-dispersed mixture to be less than 15 mu m by using a sand mill to obtain the water-based color paste;
s2, putting the aqueous hydroxyl acrylic copolymer dispersoid, the leveling agent and the film-forming assistant in the formula ratio into a paint preparation cylinder for uniform dispersion, then adding the aqueous color paste, dispersing for 10-20 min at the rotating speed of 500-700 rpm, then adding the polyurea rheological agent and the nonionic associative thickener, dispersing for 5-10 min, and filtering to obtain the coating A;
s3, uniformly mixing the isophorone diisocyanate prepolymer and propylene glycol methyl ether acetate according to the formula amount, and filtering to obtain an adhesive B;
s4, mixing and stirring the coating A and the adhesive B uniformly according to the proportion to obtain the self-cleaning waterborne polyurethane finish paint for the environmental engineering vehicle.
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| CN202210282491.8A CN114854294A (en) | 2022-03-22 | 2022-03-22 | Self-cleaning waterborne polyurethane finish paint for environmental engineering vehicle and preparation method thereof |
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| CN202210282491.8A CN114854294A (en) | 2022-03-22 | 2022-03-22 | Self-cleaning waterborne polyurethane finish paint for environmental engineering vehicle and preparation method thereof |
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| JP2011068864A (en) * | 2009-08-31 | 2011-04-07 | Kansai Paint Co Ltd | Coating composition and method for forming coating film |
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| CN114181588A (en) * | 2021-12-28 | 2022-03-15 | 苏州市贝特利高分子材料股份有限公司 | Water-based epoxy zinc-rich primer and preparation method thereof |
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| JP2011068864A (en) * | 2009-08-31 | 2011-04-07 | Kansai Paint Co Ltd | Coating composition and method for forming coating film |
| CN106433439A (en) * | 2016-09-22 | 2017-02-22 | 佛山市科顺建筑材料有限公司 | Cold-construction non-cured polyurethane waterproof coating and preparing method thereof |
| CN112625575A (en) * | 2020-12-18 | 2021-04-09 | 锌盾化工无锡有限公司 | Water-based polyurethane finish paint for rail transit and preparation method thereof |
| CN113265189A (en) * | 2021-04-19 | 2021-08-17 | 株洲市九华新材料涂装实业有限公司 | Water-based acrylic polyurethane finish paint and preparation method and application thereof |
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Application publication date: 20220805 |