CN118027796A - High-performance water-based paint for outer curtain wall and preparation method thereof - Google Patents
High-performance water-based paint for outer curtain wall and preparation method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000003973 paint Substances 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 238000000576 coating method Methods 0.000 claims abstract description 68
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910000077 silane Inorganic materials 0.000 claims abstract description 63
- 239000011248 coating agent Substances 0.000 claims abstract description 62
- 239000004814 polyurethane Substances 0.000 claims abstract description 33
- 229920002635 polyurethane Polymers 0.000 claims abstract description 33
- 239000008367 deionised water Substances 0.000 claims abstract description 32
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 32
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 22
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 22
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 22
- 239000002562 thickening agent Substances 0.000 claims abstract description 21
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000000839 emulsion Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000001023 inorganic pigment Substances 0.000 claims abstract description 13
- 239000011256 inorganic filler Substances 0.000 claims abstract description 12
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 44
- 238000002156 mixing Methods 0.000 claims description 34
- 239000000049 pigment Substances 0.000 claims description 29
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 28
- 239000000945 filler Substances 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 20
- 238000000227 grinding Methods 0.000 claims description 20
- 238000010276 construction Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000006116 polymerization reaction Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000003301 hydrolyzing effect Effects 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000005254 chromizing Methods 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 11
- 238000005034 decoration Methods 0.000 abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 abstract description 9
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 6
- 238000007385 chemical modification Methods 0.000 abstract description 4
- 239000012948 isocyanate Substances 0.000 abstract description 3
- 239000011527 polyurethane coating Substances 0.000 abstract description 3
- 150000002513 isocyanates Chemical class 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 15
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 230000008901 benefit Effects 0.000 description 7
- 238000009472 formulation Methods 0.000 description 7
- 229920002545 silicone oil Polymers 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 239000002585 base Substances 0.000 description 5
- 238000005524 ceramic coating Methods 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 238000004383 yellowing Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000001680 brushing effect Effects 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000004075 alteration Effects 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000003086 colorant Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000008199 coating composition Substances 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- -1 no silica sol Chemical compound 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 150000004756 silanes Chemical class 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 241001289295 Asarum sieboldii Species 0.000 description 1
- 229910014314 BYK190 Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical group N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 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
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- 229940092714 benzenesulfonic acid Drugs 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000002464 physical blending Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention discloses a high-performance water-based paint for an outer curtain wall and a preparation method thereof; the coating is a two-component system, wherein the component A comprises: 40-60 parts of silane prepolymer, 20-30 parts of aqueous polyurethane modified acrylic emulsion, 0.5-0.7 part of polyurethane thickener, 0.2-0.4 part of leveling agent, 1-3 parts of dispersing agent, 10-15 parts of inorganic pigment, 10-15 parts of inorganic filler and 10-20 parts of deionized water; and the component B comprises the following components: aliphatic polyisocyanate aqueous crosslinking agent. According to the invention, the silane prepolymer is added into the bi-component water-based acrylic polyurethane coating, hydroxyl (-OH) on the surface of the silane prepolymer can react with isocyanate (-NCO) contained in the polyisocyanate crosslinking agent, the silane prepolymer and the film forming substance are connected together, and the stable high-performance water-based coating which can be used for outdoor aluminum curtain wall decoration is prepared through a chemical modification mode.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a high-performance water-based coating for an outer curtain wall and a preparation method thereof.
Background
At present, public buildings, large commercial centers, high-rise buildings and the like are more and more, and the outer surface of the building is usually decorated by adopting an aluminum curtain wall plate for achieving the attractive effect.
The common decorative paint for aluminum curtain wall plates is fluorocarbon paint and ceramic paint. The more mature fluorocarbon paint commonly used at present is solvent-based and is widely applied due to its excellent weather resistance, corrosion resistance and flexibility. However, solvent type fluorocarbon paint mainly has the problems of large VOC emission, poor film hardness, low fire resistance level, high construction cost and the like because the spraying process is two-coating one-baking or three-coating one-baking; the water-based fluorocarbon paint mainly uses FEVE as film forming resin, and the product mainly uses brushing and rolling coating in a construction mode due to low solid content and high viscosity, and is mainly applied to surfaces of outer curtain walls, bridges, steel structures and the like, and the problems of poor brushing resistance, large chromatic aberration, inconsistent gloss, poor leveling property and the like can occur after brushing, so that the water-based fluorocarbon paint cannot be applied to places with higher appearance requirements, and no mature water-based fluorocarbon paint for aluminum curtain walls exists in the market at present.
The ceramic coating is a novel environment-friendly water-based inorganic coating, has the advantages of high hardness, good brushing resistance, A-level fireproof performance and the like, and is gradually popularized and applied in the field of aluminum curtain wall decoration in recent ten years. However, the service time of the cured ceramic coating is only 48 hours, the requirements of sand blasting, preheating spraying and the like of a base material are met in construction, sagging and the like are easy to occur in large-area construction due to low viscosity of the coating, and a plurality of inconveniences are caused in use; and the ceramic coating is only suitable for plane plates due to the fact that the hardness is too high and the toughness is poor, so that popularization and application of the ceramic coating in the field of aluminum curtain wall decoration are seriously affected. The market is urgently required to develop a water-based paint which can be applied to the aluminum curtain wall decoration field, and the advantages of good weather resistance and flexible coating of fluorocarbon paint can be combined with the advantages of safety, environmental protection, good washing resistance, A-level fireproof performance and the like of ceramic paint, so that the requirements of the curtain wall decoration field on appearance, hardness, environmental protection, weather resistance and convenience in construction are met.
Disclosure of Invention
The invention aims to solve the problems of the existing aluminum curtain wall plate decorative coating, and provides the water-based coating which can be used in the outer curtain wall decorative industry by taking the bi-component water-based acrylic polyurethane coating as a basis and adopting a chemical modification method, and has the advantages of convenience in construction, good weather resistance, low VOC (volatile organic compound) emission, A-level fireproof performance, hardness, flexibility and the like.
The aim of the invention is realized by the following technical scheme:
in a first aspect, the invention relates to a high-performance water-based paint for an outer curtain wall, which is a two-component system and comprises the following components in formula:
The component A comprises the following components: 40-60 parts of silane prepolymer, 20-30 parts of aqueous polyurethane modified acrylic emulsion, 0.5-0.7 part of polyurethane thickener, 0.2-0.4 part of leveling agent, 1-3 parts of dispersing agent, 10-15 parts of inorganic pigment, 10-15 parts of inorganic filler and 10-20 parts of deionized water;
And the component B comprises the following components: an aliphatic polyisocyanate aqueous crosslinking agent;
the mass ratio of the component A to the component B is 1:1-1.4:1.
As an embodiment of the present invention, the silane prepolymer comprises the following components in 100 parts by weight: 54-57 parts of silane, 21-23 parts of deionized water, 5-6 parts of acetic acid and the balance of absolute ethyl alcohol.
As one embodiment of the invention, the silane is used in a mass ratio of (2-3): 1 (MTMS) and Phenyltrimethoxysilane (PTMS). The trifunctional silane can be hydrolyzed and polymerized to form a denser molecular structure, and the phenyl-containing silane is added, so that the hardness and salt fog resistance of the coating can be improved because the benzene ring belongs to a rigid group. The proportion is too high, the hardness of the coating is slightly low, and the salt fog resistance is poor; the coating flexibility is poor due to the too low proportion.
In addition, since trifunctional silanes are used, in theory 3mol H 2 O is required for the hydrolysis of 1mol of silane, so that the molar ratio of deionized water to silane is not less than 3:1, a step of; the deionized water is too little, the silane hydrolysis polymerization reaction is insufficient, the molecular weight of the product is small, the hardness of the coating is low, and the wear resistance is poor.
As an embodiment of the present invention, no silica sol, i.e., no silica sol, may be added to the high performance waterborne coating formulation of the present invention. Because silica sol is added into the system of the invention, the coating has high hardness and poor flexibility, can be only used as the surface coating of the plane substrate, and can crack the coating due to a small amount of deformation of the special-shaped plate in the actual use process.
In the system of the invention, acetic acid is used as a pH regulator for the hydrolytic polymerization of silane, and the pH of the reaction system for forming silane prepolymer by the hydrolytic polymerization of silane is controlled between 3.5 and 4.4. The hydrolysis polymerization reaction of the silane can generate colorless and transparent polymer under the acidic condition, the acidity of the acetic acid is weak, the addition amount is large, and the pH environment of the reaction is not influenced by a small amount of addition error. If formic acid, citric acid, oxalic acid, benzenesulfonic acid or inorganic acid with stronger acidity is used, the addition amount is generally below 1%, a small amount of addition error can affect the pH environment of the silane hydrolysis polymerization reaction, and although the addition error can be reduced by a deionized water dilution method, excessive deionized water can be introduced, so that the solid content of the finished coating can be reduced, and the coating has low hardness and poor wear resistance.
Furthermore, a small amount of absolute ethyl alcohol solvent is added into the system, so that the compatibility and stability of each component in the system can be improved.
As one embodiment of the invention, the aqueous polyurethane modified acrylic emulsion is used as one of main film forming substances of the coating, combines the advantages of the aqueous acrylic emulsion such as transparency, glossiness, weather resistance and low cost, and has the characteristics of excellent flexibility, low temperature resistance and bonding strength, and can endow the coating with excellent weather resistance, water resistance, glossiness and adhesive force. The aqueous polyurethane modified acrylic emulsion is selected from conventional commercial products such as: PROSPERSE 130,130 of the Dow chemical.
In the system, the polyurethane thickener is used for adjusting the viscosity of the paint, so that the paint does not sag in large-area spraying construction at normal temperature. The polyurethane thickener may be selected from conventional commercial products such as: qingdao Jia Tiancheng New Material technology Co.Ltd SV-1030.
The common thickening agents mainly comprise four types of inorganic type, cellulose type, polyacrylate alkali swelling type and associative polyurethane thickening agents. The associative polyurethane thickener is selected in the formula, and has the advantages of good leveling property, good water resistance of the coating, no influence on the glossiness of the coating, wide pH application range and the like. Inorganic thickening agents (such as fumed silica and organic bentonite) can obviously reduce the surface gloss of a coating film and influence the appearance decoration of the coating; after the construction of the cellulose thickener is finished, the viscosity is rapidly increased, so that the leveling property is poor, and the water resistance of a paint film is reduced; polyacrylate alkali swelling is sensitive to the pH value of the coating, and can cause poor water resistance of the coating.
In the system of the invention, the leveling agent can promote the paint to form a smooth and even coating film in the drying and film forming process, and can also prevent the occurrence of defects of the coating film such as shrinkage cavity, orange peel and the like. The leveling agent can be a commercially available water-based paint leveling agent, for example: BYK-333.
In the system of the invention, the dispersing agent has the functions of reducing pigment and filler dispersing time, stabilizing pigment dispersion, improving pigment tinting strength and hiding power, and the like. Commercially available products may be used, for example: BYK180, BYK190, BYK2010, BYK2001, and the like.
In the system of the present invention, inorganic pigments are used to impart different colors to the coating. The inorganic pigment has stable structure, good weather resistance and difficult color change under ultraviolet irradiation. Common inorganic pigments may be used, for example: titanium dioxide, carbon black, iron oxide red, iron oxide yellow, cobalt blue and the like.
In the system of the invention, the inorganic filler has the functions of reducing the cost of the paint, increasing the solid content of the paint, and the like. Common inorganic fillers may be used, for example: mica powder, silica micropowder, kaolin, alumina powder, etc.
In the system of the present invention, the aliphatic polyisocyanate aqueous crosslinking agent is a paint curing agent. The isocyanic acid group (-NCO) has high reactivity, can react with hydrophilic groups such as hydroxyl, carboxyl, amino and the like on a molecular chain of the water-based resin at normal temperature to form a crosslinked structure, and remarkably improves the water resistance, chemical resistance, wear resistance, adhesive force and the like of a water-based resin paint film. The aliphatic isocyanate crosslinking agent also has excellent yellowing resistance, can reduce the yellowing and color change of the coating under ultraviolet irradiation, and has the defects of yellowing, poor weather resistance and the like if the aromatic polyisocyanate water-based crosslinking agent is selected. The aliphatic polyisocyanate aqueous crosslinking agent may be commercially available products such as: jinjiang KX-9161, Y-6280, of Asarum sieboldii New material Co., ltd.
The invention also relates to a preparation method of the high-performance water-based paint for the outer curtain wall, which comprises the following steps:
s1, preparing a water-based paint:
S1-1, preparation of silane prepolymer: sequentially adding silane, absolute ethyl alcohol and acetic acid, uniformly mixing, adding deionized water, and curing for later use;
S1-2, preparation of pigment slurry: uniformly mixing inorganic pigment, 45-55% of deionized water and 45-55% of dispersing agent, grinding, dispersing, filtering and discharging to obtain pigment slurry;
S1-3, preparing filler slurry: uniformly mixing inorganic filler, residual deionized water and residual dispersing agent, grinding, dispersing, filtering and discharging to obtain filler slurry;
s1-4, preparing a component A: uniformly mixing a silane prepolymer, aqueous polyurethane modified acrylic emulsion, filler slurry, pigment slurry and a leveling agent, adding a polyurethane thickener, and adjusting the viscosity of a coating-4 cup to 18-22s to obtain a component A;
S2, preparing a finished coating: and (3) adding the component A into the aliphatic polyisocyanate water-based crosslinking agent, and mixing to obtain the finished coating.
As one embodiment of the present invention, in the step S1-1, the curing is performed at a rotation speed of 120 to 180 rpm on a roll frame for 6 to 8 hours. The silane prepolymer added in the invention can effectively improve the performances of coating hardness, salt fog resistance and the like. The self-made silane prepolymer is a polymer with reactive hydroxyl on the surface of a molecular chain, and the hydroxyl and aliphatic polyisocyanate are combined together through a crosslinking reaction to form a stable coating system. If the stable silane prepolymer product added with the end-capping reagent is adopted, the properties of coating hardness, salt fog resistance and the like cannot be effectively improved due to the fact that a reactive group is not arranged on a molecular chain.
For example: the IOTA616 terminal hydrogen silicone oil of Anhui Ai Yaoda silicone oil limited company has viscosity index of 100mpa.s, molecular weight of 6000 and structural formula as follows:
or IOTA-273 vinyl silicone oil of Anhui Aijia silicone oil limited company, with viscosity index of 500mpa.s, molecular weight of 17200, and structural formula as follows:
As one embodiment of the invention, in the step S1-2, the grinding dispersion and the filtration are carried out at 1600-2000 rpm for 45-60min, and the fineness is below 20 mu m, and the filtration is carried out by 200 meshes.
As one embodiment of the invention, in the step S1-3, the grinding dispersion and the filtration are carried out at 1600-2000 rpm for 45-60min, and the fineness is below 20 mu m, and the filtration is carried out by 200 meshes.
As an embodiment of the present invention, in step S1-4, the polyurethane thickener is added at a rate of 60 to 80 drops/min with stirring. The polyurethane thickener cannot be added too quickly, otherwise gel precipitation or hardening occurs, resulting in paint rejection.
As one embodiment of the present invention, in step S2, the A component is added with the aliphatic polyisocyanate aqueous crosslinking agent at a stirring speed of 300 to 500 rpm. If the aromatic polyisocyanate cross-linking agent is used, the paint film is easy to have the defects of yellowing, poor weather resistance and the like.
As one embodiment of the present invention, in the step S2, the mixing time is 10 to 20 minutes.
When the water-based paint is prepared, pigment slurry and filler slurry are required to be ground separately, and pigment and filler cannot be ground into color paste together with film forming substances, because: firstly, the silane prepolymer is in an unstable coating state, the hydrolytic polymerization reaction of the silane is still continued, if pigment and filler are added and grinded together, the polymerization reaction is accelerated under high-speed dispersion and grinding, and the viscosity of the silane prepolymer is too high to be used. Secondly, if the pigment and filler are added into the polyurethane modified acrylic emulsion and ground together, the emulsion is broken and precipitation occurs.
Furthermore, pigment slurry and filler slurry are respectively and independently ground, so that the color mixing of the finished product paint can be facilitated, the color is firstly mixed according to the corresponding pigment slurry and filler slurry, then the paint is manufactured and used, the production efficiency is high, and no chromatic aberration is generated. Because the fineness of the pigment is different, the colors are slightly different, and color difference can be well avoided by blending the colors after grinding alone.
The invention also relates to a construction method of the high-performance water-based paint for the outer curtain wall, which comprises the following steps: the base material is subjected to degreasing, acid washing and chromizing treatment, and then is constructed in a one-coating one-baking mode.
In the aqueous coating system of the invention, the isocyanate group (-NCO) contained in the aliphatic polyisocyanate aqueous crosslinking agent has high reactivity, and can be crosslinked with hydroxyl groups on a silane prepolymer molecular chain and amino groups on a polyurethane modified acrylic emulsion molecular chain to form a film. The silane prepolymer is connected with the film forming substance through a chemical bond, belongs to a chemical modification mode, and compared with the modification of physical blending, the silane prepolymer has good stability and can not generate the problems of incompatibility such as layering, precipitation and the like.
Although the crosslinking reaction can be carried out at normal temperature, the reaction can be completed only in 7 days at normal temperature, and the normal temperature curing crosslinking density is low, so that the hardness of the coating is low, and the salt spray resistance and the weather resistance are not ideal, so that the water-based paint adopts a heating curing mode, is cured for 30-40min at 80-120 ℃, has high hardness and excellent coating performance after film formation, and can meet the requirements of outdoor curtain wall decorative coatings.
As one embodiment of the invention, after the one-coating one-baking is normal-temperature spraying construction, the low-temperature heating and curing are carried out: 80-100deg.C for 30-40min.
As one embodiment of the invention, the coating film obtained after one-time coating and one-time baking has a thickness of 40-60 μm.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the silane prepolymer is added into the bi-component water-based acrylic polyurethane coating, hydroxyl (-OH) on the surface of the silane prepolymer can react with isocyanate (-NCO) contained in the polyisocyanate crosslinking agent, the silane prepolymer and the film forming substance are connected together, and the stable high-performance water-based coating which can be used for outdoor aluminum curtain wall decoration is prepared through a chemical modification mode. The trifunctional silane is selected to react with deionized water, and the molar ratio of the deionized water to the silane is controlled to be more than or equal to 3:1, the silane hydrolysis polymerization reaction is sufficient, a compact silane prepolymer is formed, and two silanes are used together, so that the coating with better comprehensive performance is obtained; compared with the main stream solvent fluorocarbon paint in the existing curtain wall decoration field, the weather resistance is not different, the hardness is obviously improved compared with that of the fluorocarbon paint, the balance of hardness and flexibility is achieved, and the coating performance can meet the requirement of outdoor curtain wall decoration;
(2) In the formula, the aqueous resin is used as a main film forming substance, a small amount of organic solvent is added, the VOC content is low, and compared with the main stream solvent type fluorocarbon paint in the existing curtain wall decoration field, the environment protection performance is obviously improved; the crosslinking density of the water-based paint is increased by a low-temperature heating and curing mode; the organic component content in the formula is low, and the fire resistance grade of the paint film can reach grade A; aliphatic polyisocyanate is used as a cross-linking agent, so that yellowing resistance and weather resistance of a paint film are improved;
(3) The preparation method adopts a mode of independently grinding pigment slurry and filler slurry, thereby being convenient for the color mixing of the finished coating and avoiding the generation of chromatic aberration;
(4) The pretreatment process is the same as that of the prior solvent type fluorocarbon paint, the construction method of one-coating and one-baking is adopted, the curing temperature is low, and compared with the prior fluorocarbon paint, the construction process is simplified, and the energy consumption is saved. The base material does not need sand blasting treatment, can be constructed at normal temperature, and has the advantage of convenient construction compared with ceramic coating.
Detailed Description
The present invention will be described in detail with reference to examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that several modifications and improvements can be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
The high-performance water-based paint for the outer curtain wall is a two-component system, and the formula is as follows:
The component A comprises the following components: 40-60 parts of silane prepolymer, 20-30 parts of aqueous polyurethane modified acrylic emulsion, 0.5-0.7 part of polyurethane thickener, 0.2-0.4 part of leveling agent, 1-3 parts of dispersing agent, 10-15 parts of inorganic pigment, 10-15 parts of inorganic filler and 10-20 parts of deionized water; the silane prepolymer comprises the following components in 100 parts: 60-62 parts of silane, 18-20 parts of deionized water, 5-6 parts of acetic acid and the balance of absolute ethyl alcohol.
And the component B comprises the following components: aliphatic polyisocyanate aqueous crosslinking agent.
In the following examples and comparative examples, the silane was a mixture of methyltrimethoxysilane (MTMS) and Phenyltrimethoxysilane (PTMS); the aqueous polyurethane modified acrylic emulsion adopts PROSPERSE 130,130 of the Dow chemical; the polyurethane thickener adopts SV-1030 of Qingdao Jia Tiancheng New Material technology Co., ltd; BYK-333 is adopted as the leveling agent; BYK180 is adopted as the dispersing agent; the aliphatic polyisocyanate water-based crosslinking agent is KX-9161 of Jinjiang Xin chemical industry Co., ltd or Y-6280 of clam port Adiya new materials Co., ltd.
Example 1
This example 1 provides a high performance water-based paint for an outer curtain wall, the composition formulation of which is shown in table 1.
The preparation method comprises the following steps:
s1, preparing a water-based paint:
s1-1, preparation of silane prepolymer: sequentially adding silane, absolute ethyl alcohol and acetic acid, uniformly mixing, adding deionized water, and curing for 7 hours on a roller frame at a rotating speed of 150 rpm;
S1-2, preparation of pigment slurry: mixing inorganic pigment, 55% deionized water and 45% dispersing agent uniformly, grinding and dispersing for 50min at 1800 rpm, filtering with 200 mesh sieve until fineness is below 20 μm, and discharging to obtain pigment slurry;
S1-3, preparing filler slurry: uniformly mixing inorganic filler, residual deionized water and residual dispersing agent, grinding and dispersing for 55min at 1800 rpm, filtering with 200 meshes below 20 mu m, and discharging to obtain filler slurry;
S1-4, preparing a component A: uniformly mixing a silane prepolymer, aqueous polyurethane modified acrylic emulsion, filler slurry, pigment slurry and a leveling agent, adding a polyurethane thickener at a speed of 70 drops/min under stirring, and adjusting the viscosity of a coating-4 cup to 20s to obtain a component A;
s2, preparing a finished coating: and (3) adding the aliphatic polyisocyanate water-based crosslinking agent into the component A at the stirring speed of 400 rpm, and mixing for 15min to obtain the finished coating.
Example 2
This example 2 provides a high performance water-based paint for an outer curtain wall, the composition formulation of which is shown in table 1.
The preparation method comprises the following steps:
s1, preparing a water-based paint:
s1-1, preparation of silane prepolymer: sequentially adding silane, absolute ethyl alcohol and acetic acid, uniformly mixing, adding deionized water, and curing for 8 hours on a roller frame at a rotating speed of 120 r/min for later use;
S1-2, preparation of pigment slurry: mixing inorganic pigment, 50% deionized water and 50% dispersing agent uniformly, grinding and dispersing for 45min at 2000 rpm, filtering with 200 mesh sieve until fineness is below 20 μm, and discharging to obtain pigment slurry;
s1-3, preparing filler slurry: uniformly mixing inorganic filler, residual deionized water and residual dispersing agent, grinding and dispersing for 60min at 1600 revolutions per minute, filtering with 200 meshes below 20 mu m, and discharging to obtain filler slurry;
S1-4, preparing a component A: uniformly mixing a silane prepolymer, aqueous polyurethane modified acrylic emulsion, filler slurry, pigment slurry and a leveling agent, adding a polyurethane thickener at a speed of 60 drops/min under stirring, and adjusting the viscosity of a coating-4 cup to 22s to obtain a component A;
S2, preparing a finished coating: and (3) adding the aliphatic polyisocyanate water-based crosslinking agent into the component A at the stirring speed of 500 r/min, and mixing for 10min to obtain the finished coating.
Example 3
This example 3 provides a high performance water-based paint for outer curtain wall, the composition formulation of which is shown in table 1.
The preparation method comprises the following steps:
s1, preparing a water-based paint:
s1-1, preparation of silane prepolymer: sequentially adding silane, absolute ethyl alcohol and acetic acid, uniformly mixing, adding deionized water, and curing for 6 hours on a roller frame at a rotating speed of 180 rpm;
S1-2, preparation of pigment slurry: uniformly mixing inorganic pigment, 45% deionized water and 55% dispersing agent, grinding and dispersing for 60min at 1600 rpm, filtering with 200 mesh sieve until the fineness is below 20 μm, and discharging to obtain pigment slurry;
S1-3, preparing filler slurry: uniformly mixing inorganic filler, residual deionized water and residual dispersing agent, grinding and dispersing for 45min at 2000rpm, filtering with 200 meshes below 20 mu m, and discharging to obtain filler slurry;
S1-4, preparing a component A: uniformly mixing a silane prepolymer, aqueous polyurethane modified acrylic emulsion, filler slurry, pigment slurry and a leveling agent, adding a polyurethane thickener at a speed of 80 drops/min under stirring, and adjusting the viscosity of a coating-4 cup to 18s to obtain a component A;
S2, preparing a finished coating: and (3) adding the aliphatic polyisocyanate water-based crosslinking agent into the component A at the stirring speed of 300rpm, and mixing for 20min to obtain the finished coating.
Examples 4 to 6
Examples 4-6 provide a class of high performance water-based paint for outer curtain wall with the composition formulation shown in Table 1.
The preparation procedure is as in example 1.
Comparative examples 1 to 4
Comparative examples 1-4 provide a class of waterborne coatings having the composition formulations shown in Table 1.
The preparation procedure is as in example 1.
Comparative example 5
Comparative example 5 provides a class of waterborne coatings having the composition formulations shown in table 1.
The preparation method comprises the following steps:
s1, preparing a water-based paint:
s1-1, preparation of pigment slurry: uniformly mixing inorganic pigment, 8.25 parts of deionized water and 45% of dispersing agent, grinding and dispersing for 50min at 1800 rpm, filtering with 200 meshes below 20 mu m, and discharging to obtain pigment slurry;
S1-2, preparing filler slurry: uniformly mixing inorganic filler, 6.75 parts of deionized water and the rest of dispersing agent, grinding and dispersing for 55min at 1800 rpm, filtering with 200 meshes below 20 mu m, and discharging to obtain filler slurry;
S1-3, preparing a component A: evenly mixing silane, absolute ethyl alcohol, acetic acid, 10 parts of deionized water, aqueous polyurethane modified acrylic emulsion, filler slurry, pigment slurry and leveling agent, adding polyurethane thickener at the speed of 70 drops/min under stirring, and adjusting the viscosity of a coating-4 cup to 20s to obtain a component A;
s2, preparing a finished coating: and (3) adding the aliphatic polyisocyanate water-based crosslinking agent into the component A at the stirring speed of 400 rpm, and mixing for 15min to obtain the finished coating.
Comparative examples 6 and 7
Comparative examples 6 and 7 provide a class of waterborne coatings having the composition formulations shown in table 1. The silane prepolymer in comparative example 6 was selected from IOTA616 terminal hydrogen silicone oil of Anhui Aijia silicone oil Co.
The preparation procedure was essentially the same as in example 1.
Table 1 coating compositions and amounts (wt.%) of examples and comparative examples
Primary performance test
The water-based paint prepared in the above examples and comparative examples was subjected to main performance test after being applied by the following method, the test items and methods are shown in Table 2, and the test results are shown in Table 3.
And (3) construction: after degreasing, acid washing and chromizing treatment, the base material is coated with one layer of paint and baked, and is subjected to normal-temperature spray coating construction, and then is heated and cured at a low temperature: 90 ℃ multiplied by 35min. The base material can be aluminum alloy, cold-rolled steel plate, galvanized steel plate, etc., and the cold-rolled steel plate is selected for the test.
TABLE 2 method for testing the Main Properties of coatings
Table 3, examples, comparative examples main performance test results
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (10)
1. A high-performance water-based paint for an outer curtain wall is a two-component system, and is characterized in that,
The component A comprises the following components: 40-60 parts of silane prepolymer, 20-30 parts of aqueous polyurethane modified acrylic emulsion, 0.5-0.7 part of polyurethane thickener, 0.2-0.4 part of leveling agent, 1-3 parts of dispersing agent, 10-15 parts of inorganic pigment, 10-15 parts of inorganic filler and 10-20 parts of deionized water;
And the component B comprises the following components: an aliphatic polyisocyanate aqueous crosslinking agent; the mass ratio of the component A to the component B is 1:1-1.4:1.
2. The high performance water paint for external curtain wall according to claim 1, wherein the silane prepolymer comprises the following components in 100 parts by weight: 54-57 parts of silane, 21-23 parts of deionized water, 5-6 parts of acetic acid and the balance of absolute ethyl alcohol.
3. The high-performance water-based paint for the outer curtain wall according to claim 2, wherein the silane is used in a mass ratio of (2-3): 1 and phenyltrimethoxysilane.
4. The high performance water-based paint for outer curtain wall according to claim 2, wherein the molar ratio of deionized water to silane in the silane prepolymer is equal to or more than 3:1.
5. The high performance water paint for external curtain wall according to claim 1, wherein the pH of the reaction system for the hydrolytic polymerization of silane to form silane prepolymer is controlled between 3.5 and 4.4.
6. A method for preparing a high performance aqueous paint for external curtain walls according to any one of claims 1 to 5, characterized in that it comprises the steps of:
s1, preparing a water-based paint:
S1-1, preparation of silane prepolymer: sequentially adding silane, absolute ethyl alcohol and acetic acid, uniformly mixing, adding deionized water, and curing for later use;
S1-2, preparation of pigment slurry: uniformly mixing inorganic pigment, 45-55% of deionized water and 45-55% of dispersing agent, grinding, dispersing, filtering and discharging to obtain pigment slurry;
S1-3, preparing filler slurry: uniformly mixing inorganic filler, residual deionized water and residual dispersing agent, grinding, dispersing, filtering and discharging to obtain filler slurry;
s1-4, preparing a component A: uniformly mixing a silane prepolymer, aqueous polyurethane modified acrylic emulsion, filler slurry, pigment slurry and a leveling agent, adding a polyurethane thickener, and adjusting the viscosity of a coating-4 cup to 18-22s to obtain a component A;
S2, preparing a finished coating: and (3) adding the component A into the aliphatic polyisocyanate water-based crosslinking agent, and mixing to obtain the finished coating.
7. The method for preparing a high performance water paint for external curtain wall according to claim 6, wherein in the step S1-1, the curing is performed for 6-8 hours at a rotational speed of 120-180 rpm on a roll frame; in the step S1-2, grinding and dispersing, filtering, namely grinding and dispersing for 45-60min at 1600-2000 r/min, and filtering with 200 meshes when the fineness is below 20 mu m; in the step S1-3, the grinding dispersion and the filtration are carried out at 1600-2000 rpm for 45-60min, and the fineness is less than 20 mu m and the filtration is carried out by 200 meshes.
8. The method for preparing a high performance aqueous paint for external curtain wall according to claim 6, wherein in step S1-4, the polyurethane thickener is added at a speed of 60-80 drops/min under stirring; in the step S2, the component A is added with the aliphatic polyisocyanate aqueous crosslinking agent at the stirring speed of 300-500 r/min, and the mixing time is 10-20min.
9. A method of constructing a high performance water paint for an outer curtain wall according to any one of claims 1 to 5, comprising the steps of: the base material is subjected to degreasing, acid washing and chromizing treatment, and then is constructed in a one-coating one-baking mode.
10. The construction method of the high-performance water-based paint for the outer curtain wall according to claim 9, wherein after the one-coating one-baking is normal-temperature spraying construction, the low-temperature heating and curing are carried out: 80-100deg.C for 30-40min.
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