CN115044287A - Two-component waterborne polyurethane finish paint and preparation method and application thereof - Google Patents
Two-component waterborne polyurethane finish paint and preparation method and application thereof Download PDFInfo
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- CN115044287A CN115044287A CN202210689690.0A CN202210689690A CN115044287A CN 115044287 A CN115044287 A CN 115044287A CN 202210689690 A CN202210689690 A CN 202210689690A CN 115044287 A CN115044287 A CN 115044287A
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- waterborne polyurethane
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- 239000003973 paint Substances 0.000 title claims abstract description 69
- 239000004814 polyurethane Substances 0.000 title claims abstract description 44
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 42
- 239000006185 dispersion Substances 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 34
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- FEWFXBUNENSNBQ-UHFFFAOYSA-N 2-hydroxyacrylic acid Chemical compound OC(=C)C(O)=O FEWFXBUNENSNBQ-UHFFFAOYSA-N 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
- 238000000576 coating method Methods 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 239000008367 deionised water Substances 0.000 claims abstract description 19
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 19
- 239000006184 cosolvent Substances 0.000 claims abstract description 15
- 239000000080 wetting agent Substances 0.000 claims abstract description 15
- 238000009835 boiling Methods 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 14
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 14
- UYAAVKFHBMJOJZ-UHFFFAOYSA-N diimidazo[1,3-b:1',3'-e]pyrazine-5,10-dione Chemical compound O=C1C2=CN=CN2C(=O)C2=CN=CN12 UYAAVKFHBMJOJZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 229940116423 propylene glycol diacetate Drugs 0.000 claims abstract description 13
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 13
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 11
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 claims abstract description 8
- XLJMAIOERFSOGZ-UHFFFAOYSA-N anhydrous cyanic acid Natural products OC#N XLJMAIOERFSOGZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000003254 anti-foaming effect Effects 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 31
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 12
- 239000012948 isocyanate Substances 0.000 claims description 11
- 150000002513 isocyanates Chemical class 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical group CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 claims description 7
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical group CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000012972 dimethylethanolamine Substances 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
- 229960002887 deanol Drugs 0.000 claims description 2
- 239000003002 pH adjusting agent Substances 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- 239000002585 base Substances 0.000 description 27
- 239000004721 Polyphenylene oxide Substances 0.000 description 16
- 125000001931 aliphatic group Chemical group 0.000 description 16
- 229920000570 polyether Polymers 0.000 description 16
- 229920001228 polyisocyanate Polymers 0.000 description 16
- 239000005056 polyisocyanate Substances 0.000 description 16
- 238000010276 construction Methods 0.000 description 13
- 230000002209 hydrophobic effect Effects 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- YXRKNIZYMIXSAD-UHFFFAOYSA-N 1,6-diisocyanatohexane Chemical compound O=C=NCCCCCCN=C=O.O=C=NCCCCCCN=C=O.O=C=NCCCCCCN=C=O YXRKNIZYMIXSAD-UHFFFAOYSA-N 0.000 description 7
- 229920003009 polyurethane dispersion Polymers 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000007665 sagging Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000011527 polyurethane coating Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000007605 air drying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 206010027627 Miliaria Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 201000004169 miliaria rubra Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004383 yellowing 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
- C09D7/20—Diluents or solvents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a two-component waterborne polyurethane finish paint and a preparation method and application thereof, wherein the two-component waterborne polyurethane finish paint comprises a component A and a component B; the component A comprises the following raw materials in percentage by mass: 60-70% of water-based hydroxyl acrylic acid secondary dispersion, 1-1.5% of dispersing agent, 0.2-0.3% of pH value regulator, 0.1-0.2% of base material wetting agent, 0.1-0.2% of flatting agent, 0.8-1.5% of anti-foaming auxiliary agent, 2-3% of high-boiling point cosolvent, 5-10% of titanium dioxide, 0.5-1% of fumed silica, 2-3% of color paste and the balance of deionized water; the component B comprises the following raw materials in percentage by mass: 80-90% of isocyanic acid curing agent and the balance of propylene glycol diacetate. The coating has the advantages of high drying speed, low-temperature baking or self-drying, high coating hardness, high gloss, good fullness, excellent adhesion, ideal mechanical property and good weather resistance.
Description
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a two-component waterborne polyurethane finish paint and a preparation method and application thereof.
Background
The state requires that the emission reduction of VOCs (volatile organic compounds) in the engineering machinery industry reaches more than 30%, and the water-based paint is one of the most environment-friendly paint types and has a larger application space in the engineering machinery (including forklift and agricultural machinery) industry. However, the engineering machinery is a kind of machine equipment used for engineering construction, the base material is generally steel, and is generally indoor construction and outdoor storage, so the working condition is bad, the base material faces wind, dust pollution, rain wash and the like in nature, and the base material is easily subjected to the comprehensive action of factors such as humid gas, salt fog, rain, sunshine and the like in the air in the using process, so the ageing and corrosion phenomena are generated, and the appearance and the mechanical property are deteriorated. Therefore, engineering machinery needs to be coated with protection, a paint film needs to be coated on the surface of the engineering machinery, and the overall effect after coating is displayed through a finish paint film, so that the finish paint film is required to have the characteristics of high hardness, high glossiness, good weather resistance, ideal mechanical property and strong adhesive force.
The water-based paint has the characteristics of safety and environmental protection, is used for replacing solvent-based paint with serious pollution, and has wide application in many fields. In the field of engineering mechanical coatings, the hot door of the existing waterborne coatings mainly comprises waterborne acrylate coatings, waterborne epoxy coatings, waterborne polyurethane coatings and the like, wherein the waterborne polyurethane coatings are mainly used as finish paints in the aspect of engineering mechanical coatings and matched with waterborne epoxy, waterborne alkyd, waterborne polyester and other anticorrosion primers due to good decoration and mechanical properties and excellent alkali resistance, water resistance and moisture resistance of coatings. The existing waterborne polyurethane coating is a two-component product, and during construction of the waterborne coating, due to low solid content, the problems of slow drying, poor fullness and easy sagging during construction exist, the requirements on coating construction parameters and environment are harsh, the construction quality is difficult to control, the yield is low, and the rework probability is high.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a two-component waterborne polyurethane finish paint which has the advantages of high drying speed, low-temperature baking or self-drying, high coating hardness, high gloss, good fullness, excellent adhesion, ideal mechanical property and good weather resistance. In addition, the invention also provides a preparation method and application of the two-component waterborne polyurethane finish paint.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a two-component waterborne polyurethane finish paint in a first aspect, which comprises a component A and a component B;
the component A comprises the following raw materials in percentage by mass: 60-70% of water-based hydroxyl acrylic acid secondary dispersion, 1-1.5% of dispersing agent, 0.2-0.3% of pH value regulator, 0.1-0.2% of base material wetting agent, 0.1-0.2% of flatting agent, 0.8-1.5% of anti-foaming auxiliary agent, 2-3% of high-boiling point cosolvent, 5-10% of titanium dioxide, 0.5-1% of fumed silica, 2-3% of color paste (for color mixing) and the balance of deionized water;
the component B comprises the following raw materials in percentage by mass: 80-90% of isocyanic acid curing agent and the balance of propylene glycol diacetate.
Adopt above-mentioned technical scheme:
firstly, the water-based hydroxyl acrylic acid secondary dispersion is used as the base resin, so that the drying speed, the glossiness and the fullness of a paint film can be improved, and the obtained paint film has the advantages of high hardness, good fullness, high glossiness, good adhesive force with a base material, good weather resistance, no yellowing and no toxicity to human bodies.
And secondly, the fumed silica has the sagging prevention function, and is compounded with the anti-bubble auxiliary agent, so that the paint has higher thixotropy and sagging prevention performance, the workability cannot be influenced by the sharp increase of the viscosity of the paint after the paint is prepared, and the thick paint can be coated at one time.
Thirdly, the mass ratio of the isocyanic acid curing agent to the isocyanate curing agent is 1: (1-1.4) mixing a hydrophobic HDI trimer and a HDI-based hydrophilic polyether modified aliphatic polyisocyanate, wherein the hydrophobic HDI trimer is obtained from Guangzhou New Material science and technology Limited and is of the type OS-9030, and the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is obtained from Guangzhou New Material science and technology Limited and is of the type OS-9018. Hydrophobic HDI tripolymer and hydrophilic polyether modified aliphatic polyisocyanate based on HDI are compounded to be used as a curing agent, and the viscosity and thixotropy of paint after paint preparation are improved by utilizing the faster reaction speed of the hydrophilic polyether modified aliphatic polyisocyanate based on HDI and the waterborne hydroxyl acrylic acid secondary dispersion, so that sagging during initial construction of paint preparation is avoided; however, viscosity and thixotropy of the hydrophilic curing agent at the later period of paint preparation are reduced, and at the moment, the viscosity and thixotropy of the hydrophobic HDI trimer at the later period of paint preparation are synergistically improved, so that the paint formula system has proper viscosity and thixotropy and good construction performance when in use.
Specifically, the solid content of the aqueous hydroxy acrylic acid secondary dispersion is 43-47%, the hydroxy content is 3-3.5%, the pH value is 7-9, and the viscosity is 1000-2000 cps/25 ℃.
In the application, the hydroxyl content of the aqueous hydroxyl acrylic acid secondary dispersion is 3-3.5%, the hydroxyl content is reduced, the drying speed of a paint film can be increased, the subsequent paint film can be dried in the air, and the process requirement that the paint film has higher requirements on the performance of the paint film under the condition of no drying can be met.
However, the hydroxyl content of the aqueous hydroxyl acrylic secondary dispersion is reduced, so that the crosslinking degree of a paint film is reduced, and the hardness and weather resistance of the dried paint film are reduced. The water-based hydroxyl acrylic acid secondary dispersion and the water-based hydroxyl polyurethane dispersion are compounded according to a specific proportion, so that the drying speed of a paint film can be increased, and the paint film can be ensured to have high hardness and high weather resistance.
The aqueous hydroxyacrylic acid secondary dispersion was model No. HB1032, and the aqueous hydroxyl-containing polyurethane dispersion was model No. Bayhydrol XP 2601.
Specifically, the high-boiling-point cosolvent is dipropylene glycol butyl ether.
The dipropylene glycol butyl ether has excellent dissolving power and good compatibility with water, can reduce the viscosity of a reaction system, enables the curing speed to be moderate, improves the film forming property, and promotes the formation of a uniform coating film in the curing process.
Specifically, the anti-foaming auxiliary agent is BYK-AQ, and the base material wetting agent is TEGO 4100.
Specifically, the pH value regulator is dimethylethanolamine. In particular, a basf DMEA model may be employed.
Specifically, the weight ratio of the component A to the component B is 100 (18-22).
The second aspect of the invention provides a preparation method of the two-component waterborne polyurethane finish paint, which comprises the following steps:
s1, putting 80% of deionized water and 50% of aqueous hydroxy acrylic acid secondary dispersion into a container, adding a dispersing agent, stirring and mixing uniformly, then slowly adding titanium dioxide and fumed silica, stirring and pre-dispersing for 30-40 min, stirring and mixing uniformly, conveying the mixture in the container to a sand mill, grinding the mixture to below 10 microns, and cleaning the residual materials of the sand mill with the rest 20% of deionized water to prepare a base material;
s2, adding the residual water-based hydroxy acrylic acid secondary dispersion and the high-boiling point cosolvent in the formula ratio into a base material paint cylinder for uniform dispersion, then adding a base material wetting agent, a leveling agent and an anti-foaming auxiliary agent for uniform dispersion, adding a pH value regulator for regulating the pH value to 7-8, then adding color paste for color mixing, continuing to disperse for 20-30 min, and filtering to obtain a component A;
s3, mixing the isocyanate curing agent and the propylene glycol diacetate uniformly according to the formula amount, and filtering to obtain a component B;
and S4, adding the component A and the component B into a container according to a proportion during coating, and uniformly dispersing and mixing to obtain the two-component waterborne polyurethane finish paint.
The third aspect of the invention provides an application of the two-component waterborne polyurethane finish paint, wherein the two-component waterborne polyurethane finish paint is used for coating mechanical equipment, instruments and meters, automobile carriages, self-drying ATM machines, industrial equipment, steel cylinders and the like.
Before coating, the structural parts of engineering machinery products are generally subjected to pretreatment, the quality of the pretreatment is the core of paint film adhesion, and the pretreatment comprises the following specific processes: performing shot blasting treatment on a part to be coated, performing soot blowing, degreasing and phosphating treatment, and enabling a paint film to reach an optimal adhesion state through the treatment.
Specifically, the two-component waterborne polyurethane finish paint is constructed in a brush coating or spraying mode, can be baked at low temperature or dried in an air-drying mode, and can be diluted by adding water if the viscosity of the paint is high during construction, wherein the proportion of the added water is 5-10%.
The construction method comprises the following specific operation steps:
1. pretreatment of a base layer: performing shot blasting treatment on a part to be coated, and performing soot blowing, degreasing and phosphating treatment after the treatment;
2. first-pass painting: the thickness is uniform, the line angle is thinner but the bottom is covered, and flowing and brushing marks do not occur.
3. Sanding paper: and (3) polishing with 320-mesh abrasive paper, paying attention to protection of edges and corners, achieving the purpose of flat and smooth surface and flat, straight and uniform line angles, slightly polishing with the abrasive paper, and cleaning with wet cloth after polishing.
4. And (3) final painting: when spraying, the coating needs to be full, not flow and not fall, bright and uniform, and has consistent color, and if a defect exists, the coating needs to be trimmed in time and dried in an air drying mode.
5. Construction in winter: during construction in winter, the construction environment temperature is not lower than 5-10 ℃, and the relative humidity is not higher than 60%.
The paint film can be self-dried and also can be baked at low temperature, the ambient temperature is not lower than 5 ℃ and the humidity is not higher than 70% when the paint film is self-dried, and the baking degree is 40-60 ℃ and is not less than 25 minutes when the paint film is baked.
Compared with the prior art, the invention has the following beneficial effects:
the two-component waterborne polyurethane finish paint has the advantages of high drying speed, low-temperature baking or self-drying, high solid content, high hardness, ideal mechanical strength, good weather resistance, excellent adhesive force, high glossiness, good fullness and good decorative performance, is green, environment-friendly and healthy, does not cause damage and pollution to constructors and environment, has moderate viscosity and good thixotropy, can be subjected to thick coating, has the wet film thickness of more than 65 mu m, does not have the phenomenon of sagging, and has no prickly heat and dark bubbles;
the preparation method of the two-component waterborne polyurethane finish paint is simple, stable in process, controllable in conditions, capable of realizing industrial production and beneficial to popularization and application.
Detailed Description
Example 1
A two-component waterborne polyurethane finish paint comprises a component A and a component B, wherein the weight ratio of the component A to the component B is 100: 18;
the component A comprises the following raw materials in percentage by mass: 70% of water-based hydroxyl acrylic acid secondary dispersion (HB1032), 1.5% of dispersing agent (BYK-190), 0.2% of pH value regulator (Pasteff DMEA), 0.1% of base material wetting agent (TEGO 4100), 0.15% of flatting agent (TEGO 450), 1.5% of anti-bubble additive (BYK-AQ), 2.8% of high boiling point cosolvent (dipropylene glycol butyl ether), 5% of titanium dioxide (rutile titanium dioxide), 1% of fumed silica, 2% of color paste (water-based black color paste) and the balance of deionized water;
the component B comprises the following raw materials in percentage by mass: 80% of isocyanate curing agent and the balance of propylene glycol diacetate.
The solid content of the aqueous hydroxy acrylic acid secondary dispersion (the model is HB1032) is 43-47%, the hydroxyl content is 3-3.5%, the pH value is 7-9, and the viscosity is 1000-2000 cps/25 ℃.
The isocyanic acid curing agent is prepared from the following components in a mass ratio of 1: 1, the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is prepared by mixing hydrophobic HDI tripolymer and HDI-based hydrophilic polyether modified aliphatic polyisocyanate, wherein the hydrophobic HDI tripolymer is purchased from Guangzhou New Material science and technology Limited company with the model number of OS-9030, and the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is purchased from Guangzhou New Material science and technology Limited company with the model number of OS-9018.
The preparation method of the two-component waterborne polyurethane finish paint comprises the following steps:
s1, adding 80% of deionized water and 50% of aqueous hydroxy acrylic acid secondary dispersion into a container, adding a dispersing agent, stirring and mixing uniformly, then slowly adding titanium dioxide and fumed silica, pre-dispersing for 30min at the rotating speed of 600rpm, stirring and mixing uniformly, conveying a mixture diaphragm pump in the container to a sand mill for grinding treatment to be less than 10 mu m, and then cleaning the residual materials of the sand mill by using the rest 20% of deionized water to prepare a base material;
s2, adding the residual water-based hydroxyl acrylic acid secondary dispersion and the high-boiling point cosolvent in the formula ratio into a base paint cylinder for uniform dispersion, then adding a base material wetting agent, a leveling agent and an anti-foaming auxiliary agent for uniform dispersion, adding a pH value regulator for regulating the pH value to 7, then adding color paste for color mixing, dispersing at the rotating speed of 800rpm for 20min, and filtering to obtain a component A;
s3, mixing the isocyanate curing agent and the propylene glycol diacetate uniformly according to the formula amount, and filtering to obtain a component B;
and S4, adding the component A and the component B into a container according to the proportion during coating, and dispersing for 5min at the rotating speed of 150rpm to obtain the two-component waterborne polyurethane finish.
Example 2
A two-component waterborne polyurethane finish paint comprises a component A and a component B, wherein the weight ratio of the component A to the component B is 100: 19;
the component A comprises the following raw materials in percentage by mass: 60% of water-based hydroxyl acrylic acid secondary dispersion (HB1032), 10% of water-based hydroxyl polyurethane dispersion (Bayhydrol XP 2601), 1% of dispersing agent (BYK-190), 0.3% of pH value regulator (Pasteur DMEA), 0.1% of base material wetting agent (TEGO 4100), 0.2% of flatting agent (TEGO 450), 0.8% of anti-bubble auxiliary agent (BYK-AQ), 2.4% of high boiling point cosolvent (dipropylene glycol butyl ether), 10% of titanium dioxide (rutile titanium dioxide), 0.5% of fumed silica, 3% of color paste (water-based black color paste) and the balance of deionized water;
the component B comprises the following raw materials in percentage by mass: 82% of isocyanate curing agent and the balance of propylene glycol diacetate.
The solid content of the aqueous hydroxy acrylic acid secondary dispersion (the model is HB1032) is 43-47%, the hydroxyl content is 3-3.5%, the pH value is 7-9, and the viscosity is 1000-2000 cps/25 ℃.
The isocyanic acid curing agent is prepared from the following components in a mass ratio of 1: 1.1, the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is prepared by mixing a hydrophobic HDI trimer and a HDI-based hydrophilic polyether modified aliphatic polyisocyanate, wherein the hydrophobic HDI trimer is purchased from Guangzhou New Material science and technology Limited and has the model of OS-9030, and the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is purchased from Guangzhou New Material science and technology Limited and has the model of OS-9018.
The preparation method of the two-component waterborne polyurethane finish paint comprises the following steps:
s1, putting 80% of deionized water and 50% of aqueous hydroxy acrylic acid secondary dispersion into a container, adding a dispersing agent, stirring and mixing uniformly, then slowly adding titanium dioxide and fumed silica, pre-dispersing for 30min at the rotating speed of 800rpm, stirring and mixing uniformly, conveying a mixture diaphragm pump in the container to a sand mill for grinding treatment to below 10 mu m, and then cleaning the residual materials of the sand mill with the rest 20% of deionized water to prepare a base material;
s2, adding the residual formula amount of the water-based hydroxyl acrylic acid secondary dispersion, the water-based hydroxyl polyurethane dispersion and the high boiling point cosolvent into a base paint cylinder for uniform dispersion, then adding the base material wetting agent, the leveling agent and the anti-bubble additive for uniform dispersion, adding the pH value regulator to adjust the pH value to 8, then adding the color paste for color mixing, dispersing at the rotating speed of 800rpm for 30min, and filtering to obtain a component A;
s3, mixing the isocyanate curing agent and the propylene glycol diacetate uniformly according to the formula amount, and filtering to obtain a component B;
and S4, adding the component A and the component B into a container according to the proportion during coating, and dispersing for 8min at the rotating speed of 150rpm to obtain the two-component waterborne polyurethane finish.
Example 3
A two-component waterborne polyurethane finish paint comprises a component A and a component B, wherein the weight ratio of the component A to the component B is 100: 20.5;
the component A comprises the following raw materials in percentage by mass: 67% of water-based hydroxyl acrylic acid secondary dispersion (HB1032), 7% of water-based hydroxyl polyurethane dispersion (Bayhydrol XP 2601), 1.3% of dispersing agent (BYK-190), 0.25% of pH value regulator (Pasteur DMEA), 0.1% of base material wetting agent (TEGO 4100), 0.1% of flatting agent (TEGO 450), 1% of anti-explosion auxiliary agent (BYK-AQ), 3% of high boiling point cosolvent (dipropylene glycol butyl ether), 6% of titanium dioxide (rutile), 0.6% of fumed silica, 2% of color paste (water-based black color paste), and the balance of deionized water;
the component B comprises the following raw materials in percentage by mass: isocyanate curing agent 90%, the rest is propylene glycol diacetate.
The solid content of the aqueous hydroxy acrylic acid secondary dispersion (the model is HB1032) is 43-47%, the hydroxyl content is 3-3.5%, the pH value is 7-9, and the viscosity is 1000-2000 cps/25 ℃.
The isocyanic acid curing agent is prepared from the following components in a mass ratio of 1: 1.4, the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is prepared by mixing hydrophobic HDI tripolymer and HDI-based hydrophilic polyether modified aliphatic polyisocyanate, wherein the hydrophobic HDI tripolymer is purchased from Guangzhou New Material science and technology Limited company with the model number of OS-9030, and the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is purchased from Guangzhou New Material science and technology Limited company with the model number of OS-9018.
The preparation method of the two-component waterborne polyurethane finish paint comprises the following steps:
s1, putting 80% of deionized water and 50% of aqueous hydroxy acrylic acid secondary dispersion into a container, adding a dispersing agent, stirring and mixing uniformly, then slowly adding titanium dioxide and fumed silica, pre-dispersing for 40min at the rotating speed of 600rpm, stirring and mixing uniformly, conveying a mixture diaphragm pump in the container to a sand mill for grinding treatment to below 10 mu m, and then cleaning the residual materials of the sand mill with the rest 20% of deionized water to prepare a base material;
s2, adding the residual formula amount of the water-based hydroxyl acrylic acid secondary dispersion, the water-based hydroxyl polyurethane dispersion and the high-boiling point cosolvent into a base paint cylinder for uniform dispersion, then adding the base material wetting agent, the leveling agent and the anti-bubble additive for uniform dispersion, adding the pH value regulator to adjust the pH value to 7.4, then adding the color paste for color mixing, dispersing at the rotating speed of 1000rpm for 20min, and filtering to obtain a component A;
s3, mixing the isocyanate curing agent and the propylene glycol diacetate uniformly according to the formula amount, and filtering to obtain a component B;
and S4, adding the component A and the component B into a container according to the proportion during coating, and dispersing for 5min at the rotating speed of 200rpm to obtain the two-component waterborne polyurethane finish.
Example 4
A two-component waterborne polyurethane finish paint comprises a component A and a component B, wherein the weight ratio of the component A to the component B is 100: 22;
the component A comprises the following raw materials in percentage by mass: 70% of water-based hydroxyl acrylic acid secondary dispersion (HB1032), 5% of water-based hydroxyl polyurethane dispersion (Bayhydrol XP 2601), 1.4% of dispersing agent (BYK-190), 0.2% of pH value regulator (Pasteur DMEA), 0.15% of base material wetting agent (TEGO 4100), 0.1% of leveling agent (TEGO 450), 0.8% of anti-explosion auxiliary agent (BYK-AQ), 2% of high boiling point cosolvent (dipropylene glycol butyl ether), 8% of titanium dioxide (rutile titanium dioxide), 0.5% of fumed silica, 2% of color paste (water-based black color paste) and the balance of deionized water;
the component B comprises the following raw materials in percentage by mass: 88% of isocyanate curing agent and the balance of propylene glycol diacetate.
The solid content of the aqueous hydroxy acrylic acid secondary dispersion (the model is HB1032) is 43-47%, the hydroxyl content is 3-3.5%, the pH value is 7-9, and the viscosity is 1000-2000 cps/25 ℃.
The isocyanic acid curing agent is prepared from the following components in a mass ratio of 1: 1.2, the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is prepared by mixing a hydrophobic HDI trimer and a HDI-based hydrophilic polyether modified aliphatic polyisocyanate, wherein the hydrophobic HDI trimer is purchased from Guangzhou New Material science and technology Limited and has the model of OS-9030, and the HDI-based hydrophilic polyether modified aliphatic polyisocyanate is purchased from Guangzhou New Material science and technology Limited and has the model of OS-9018.
The preparation method of the two-component waterborne polyurethane finish paint comprises the following steps:
s1, putting 80% of deionized water and 50% of aqueous hydroxy acrylic acid secondary dispersion into a container, adding a dispersing agent, stirring and mixing uniformly, then slowly adding titanium dioxide and fumed silica, pre-dispersing for 40min at the rotating speed of 600rpm, stirring and mixing uniformly, conveying a mixture diaphragm pump in the container to a sand mill for grinding treatment to below 10 mu m, and then cleaning the residual materials of the sand mill with the rest 20% of deionized water to prepare a base material;
s2, adding the residual water-based hydroxyl acrylic acid secondary dispersoid, the water-based hydroxyl-containing polyurethane dispersoid and the high-boiling point cosolvent into the base paint cylinder to be uniformly dispersed, then adding the base material wetting agent, the flatting agent and the anti-bubble assistant to be uniformly dispersed, adding the pH value regulator to regulate the pH value to 7.9, then adding the color paste to adjust the color, dispersing at the rotating speed of 1000rpm for 20min, and filtering to obtain a component A;
s3, mixing the isocyanate curing agent and the propylene glycol diacetate uniformly according to the formula ratio, and filtering to obtain a component B;
and S4, adding the component A and the component B into a container according to the proportion during coating, and dispersing for 5min at the rotating speed of 200rpm to obtain the two-component waterborne polyurethane finish.
Test examples
Performance tests, test methods and test results for the two-component waterborne polyurethane finishes prepared in examples 1-4 are shown in Table 1.
TABLE 1
As shown by the test results in Table 1, the two-component waterborne polyurethane finish prepared in examples 1-4 has high solid content, can be thickly coated, has short surface drying time, high hardness, ideal mechanical strength, good weather resistance, excellent adhesion, high glossiness, good fullness and good decorative performance of a cured paint film. In particular, the two-component waterborne polyurethane topcoats of examples 2-3 had better open time, hardness, and weatherability than the two-component waterborne polyurethane topcoats of example 1.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (9)
1. A two-component waterborne polyurethane finish paint is characterized by comprising a component A and a component B;
the component A comprises the following raw materials in percentage by mass: 60-70% of water-based hydroxyl acrylic acid secondary dispersion, 1-1.5% of dispersing agent, 0.2-0.3% of pH value regulator, 0.1-0.2% of base material wetting agent, 0.1-0.2% of flatting agent, 0.8-1.5% of anti-foaming auxiliary agent, 2-3% of high-boiling point cosolvent, 5-10% of titanium dioxide, 0.5-1% of fumed silica, 2-3% of color paste and the balance of deionized water;
the component B comprises the following raw materials in percentage by mass: 80-90% of isocyanic acid curing agent and the balance of propylene glycol diacetate.
2. The two-component waterborne polyurethane topcoat as claimed in claim 1, wherein the waterborne hydroxyl acrylic secondary dispersion has a solid content of 43 to 47%, a hydroxyl content of 3 to 3.5%, a pH of 7 to 9, and a viscosity of 1000 to 2000cps/25 ℃.
3. The two-component waterborne polyurethane topcoat of claim 1, wherein the high boiling cosolvent is dipropylene glycol butyl ether.
4. The two-component waterborne polyurethane topcoat of claim 1, wherein the anti-popping aid is BYK-AQ and the substrate wetting agent is TEGO 4100.
5. The two-component waterborne polyurethane topcoat of claim 1, wherein the pH adjuster is dimethylethanolamine.
6. The two-component waterborne polyurethane finish paint of claim 1, wherein the weight ratio of the component A to the component B is 100 (18-22).
7. A method of preparing the two-component waterborne polyurethane topcoat of claim 1, comprising the steps of:
s1, putting 80% of deionized water and 50% of aqueous hydroxy acrylic acid secondary dispersion into a container, adding a dispersing agent, stirring and mixing uniformly, then slowly adding titanium dioxide and fumed silica, stirring and pre-dispersing for 30-40 min, stirring and mixing uniformly, conveying the mixture in the container to a sand mill, grinding the mixture to below 10 microns, and cleaning the residual materials of the sand mill with the rest 20% of deionized water to prepare a base material;
s2, adding the residual water-based hydroxy acrylic acid secondary dispersion and the high-boiling point cosolvent in the formula ratio into a base material paint cylinder for uniform dispersion, then adding a base material wetting agent, a leveling agent and an anti-foaming auxiliary agent for uniform dispersion, adding a pH value regulator for regulating the pH value to 7-8, then adding color paste for color mixing, continuing to disperse for 20-30 min, and filtering to obtain a component A;
s3, mixing the isocyanate curing agent and the propylene glycol diacetate uniformly according to the formula amount, and filtering to obtain a component B;
and S4, adding the component A and the component B into a container according to a proportion during coating, and uniformly dispersing and mixing to obtain the two-component waterborne polyurethane finish paint.
8. The use of the two-component waterborne polyurethane finish of claim 1, wherein the two-component waterborne polyurethane finish is used for coating mechanical equipment, instruments, cars, self-drying ATM machines, industrial equipment, steel cylinders, and the like.
9. The application of the two-component waterborne polyurethane finish paint according to claim 8, wherein the two-component waterborne polyurethane finish paint is applied by brushing or spraying, can be baked at low temperature or dried by air, and is diluted by adding water in a proportion of 5-10% when applied by spraying.
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