CN116376345A - Use of titanium yellow pigments in aqueous coating compositions - Google Patents
Use of titanium yellow pigments in aqueous coating compositions Download PDFInfo
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- CN116376345A CN116376345A CN202310559623.1A CN202310559623A CN116376345A CN 116376345 A CN116376345 A CN 116376345A CN 202310559623 A CN202310559623 A CN 202310559623A CN 116376345 A CN116376345 A CN 116376345A
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- titanium yellow
- yellow pigment
- aqueous coating
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 239000010936 titanium Substances 0.000 title claims abstract description 80
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 80
- 239000001052 yellow pigment Substances 0.000 title claims abstract description 78
- 239000008199 coating composition Substances 0.000 title claims abstract description 71
- 238000000576 coating method Methods 0.000 claims abstract description 58
- 239000011248 coating agent Substances 0.000 claims abstract description 55
- 239000000049 pigment Substances 0.000 claims abstract description 54
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 239000007787 solid Substances 0.000 claims abstract description 28
- 239000003973 paint Substances 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000011247 coating layer Substances 0.000 claims abstract description 11
- 230000002708 enhancing effect Effects 0.000 claims abstract description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 35
- 235000010215 titanium dioxide Nutrition 0.000 claims description 35
- 239000002245 particle Substances 0.000 claims description 25
- 239000012463 white pigment Substances 0.000 claims description 23
- 238000002834 transmittance Methods 0.000 claims description 16
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 238000003756 stirring Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 9
- -1 2wt% iron oxide Chemical compound 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000001038 titanium pigment Substances 0.000 description 5
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920001225 polyester resin Polymers 0.000 description 4
- 239000004645 polyester resin Substances 0.000 description 4
- 238000007665 sagging Methods 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 239000002518 antifoaming agent Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002966 varnish Substances 0.000 description 3
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 229920003270 Cymel® Polymers 0.000 description 2
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 2
- 229920003180 amino resin Polymers 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000009500 colour coating Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003039 volatile agent Substances 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 235000019606 astringent taste Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/001—Pigment pastes, e.g. for mixing in paints in aqueous medium
-
- 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
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
- C09D17/007—Metal oxide
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
Disclosed is the use of a titanium yellow pigment in an aqueous coating composition, wherein the titanium yellow pigment comprises 92 to 96wt% TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide. The use of the titanium yellow pigment in an aqueous coating composition for providing hiding properties and/or for enhancing protection of an underlying coating layer, and in an aqueous first color paint composition of a compact coating system are also disclosed. Further disclosed is an aqueous coating composition comprising a titanium yellow pigment comprising 92 to 96wt% TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide; and a compact process coating system comprising said aqueous coating composition as a color paint composition. Substrates coated with the aqueous coating composition or compact process coating system are also disclosed.
Description
Technical Field
The present invention relates to the use of titanium yellow pigments in aqueous coating compositions, and to coating compositions prepared from the pigments.
Background
Titanium white is a pigment widely used in the paint industry and has excellent opacity, whiteness and brightness. Titanium white is therefore often an essential pigment for preparing light-colored coatings. However, the price of titanium white has been greatly fluctuated in recent years, so that the cost of the paint has been remarkably increased, and thus the industry has attempted to use various alternative pigments in an attempt to reduce the cost.
Accordingly, those skilled in the art have sought a titanium pigment substitute that can be used in aqueous paints to meet performance requirements and reduce costs, which not only meets real needs, but also has great commercial potential and economic benefits.
Disclosure of Invention
The present inventors have made extensive studies and have obtained a pigment which can be used as a basic substitute for titanium white, which can be used for preparing an aqueous coating material, which satisfies the requirements of the properties of the coating material, and which reduces the cost of the coating material.
The present invention provides the use of a titanium yellow pigment in an aqueous coating composition, wherein the titanium yellow pigment comprises 92 to 96wt% TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
The invention also provides the use of a titanium yellow pigment in an aqueous coating composition for providing hiding properties and/or for enhancing protection of an underlying coating layer, wherein the titanium yellow pigment comprises 92 to 96wt% of TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
The invention further provides the use of a titanium yellow pigment in an aqueous first color paint composition of a compact process coating system, wherein the titanium yellow pigment comprises 92 to 96wt% of TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
Further, the present invention also provides an aqueous coating composition comprising a pigment mixture comprising a titanium yellow pigment comprising 92 to 96wt% of TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
The invention also provides a compact process coating system comprising a first color paint composition, wherein the first color paint composition is the aqueous coating composition described above.
The invention also provides a coated substrate comprising a substrate and the above-described aqueous coating composition coated over at least a portion of the substrate.
The features and advantages of the present invention will be presented in more detail in the following detailed description of the embodiments.
Drawings
Fig. 1. Results of the penetration test of UV-visible light of titanium yellow pigment and titanium white pigment under incident light of different wavelengths.
Detailed Description
In this application, the use of the singular includes the plural and plural encompasses singular, unless explicitly stated otherwise. For example, although reference is made herein to "a" pigment, one or more of such substances may be used.
In this application, the terms "comprising," "including," and "containing," etc., are not intended to limit the invention to the exclusion of any variant or addition. Furthermore, although the present invention has been described in terms of "comprising" and the like, the mixtures, coating compositions, methods of preparation, and the like, as detailed herein, the mixtures, coating compositions, methods of preparation, and the like can also be described as "consisting essentially of … …" or "consisting of … …". In this case, "consisting essentially of … …" means that any additional ingredients and/or steps do not materially affect the properties of the composition.
In this application, unless explicitly stated otherwise, "or" is used to mean "and/or" even though "and/or" may be explicitly used in certain instances. In addition, it should be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all subranges between the minimum value of 1 recited and the maximum value of 10 recited (inclusive), i.e., all subranges having a minimum value equal to or greater than 1 and a maximum value of equal to or less than 10.
Except in the examples, or where otherwise explicitly indicated, all numerical values set forth in the description and claims are to be understood as modified in all instances in light of the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. However, any one value inherently has certain errors necessarily resulting from the standard deviation found in its respective testing measurements.
As mentioned above, the present invention relates to the use of a titanium yellow pigment in an aqueous coating composition, wherein the titanium yellow pigment comprises 92 to 96wt% TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
As used herein, the term "aqueous" means that the solvent of the coating composition contains at least 50wt% water.
As used herein, the term "titanium yellow" pigment means a pigment having a main component (at least 75% by weight of the total solids of the pigment) of TiO 2 And further comprises at least 1wt% iron oxide.
Suitably, the titanium yellow pigment used in the present invention comprises 92 to 96wt% TiO based on the total solids weight of the pigment 2 . For example, the titanium yellow pigment used in the present invention may include 93wt% TiO based on the total solids weight of the pigment 2 Such as 94wt% TiO 2 Such as 95wt% TiO 2 。
Suitably, the titanium yellow pigment used in the present invention comprises from 1 to 3wt% iron oxide, such as from 1.5 to 2.5wt% iron oxide, based on the total solids weight of the pigment. For example, the titanium yellow pigment used in the present invention may include 1.5wt% iron oxide, such as 2wt% iron oxide, such as 2.5wt% iron oxide, based on the total solids weight of the pigment.
Suitably, the titanium yellow pigment used in the present invention may also comprise alumina. For example, the titanium yellow pigment used in the present invention may include less than 2wt% alumina, such as less than 1.5wt% alumina, such as less than 1wt% alumina, based on the total solids weight of the pigment.
Suitably, the titanium yellow pigment used in the present invention may also comprise silica. For example, the titanium yellow pigment used in the present invention may comprise 1 to 2wt% silica, such as 1.2wt% silica, such as 1.4wt% silica, such as 1.6wt% silica, such as 1.8wt% silica, based on the total solids weight of the pigment.
Suitably, the titanium yellow pigment used in the present invention may have a D50 particle size of at least 0.5 μm, such as a D50 particle size of at least 0.7 μm, such as a D50 particle size of 0.8 to 1.2 μm. For example, the titanium yellow pigment used in the present invention may have a D50 particle diameter of 0.8. Mu.m, such as a D50 particle diameter of 0.9. Mu.m, such as a D50 particle diameter of 1.0. Mu.m, such as a D50 particle diameter of 1.1. Mu.m, such as a D50 particle diameter of 1.2. Mu.m. The D50 particle size refers to the median particle size of the particles, which can be obtained by laser particle sizer measurement.
Suitably, the titanium yellow pigment used in the present invention may have a particle size of 3.8 to 4.2g/cm 3 Such as 4.0 to 4.2g/cm 3 Is a relative density of (c).
Suitably, the titanium yellow pigment used in the present invention may have an oil absorption of not more than 22ml/100g, such as 17 to 22ml/100g. The oil absorption rate refers to the minimum volume of oil required when 100g of titanium yellow pigment is completely wetted by the oil, and in the completely wetted state, the titanium yellow pigment is bonded together to achieve a non-loose state. The oil absorption rate represents the particle surface state of the titanium yellow pigment.
Suitably, the titanium yellow pigments for use in the present invention include those whose surfaces have not been treated with an organic substance.
Suitably, the titanium yellow pigment used in the present invention has a light transmittance of zero in the wavelength range of 290 to 400 nm. Suitably, the titanium yellow pigment used in the present invention allows lower light transmittance than titanium white pigments in the wavelength range of more than 400 nm. For example, in the range of more than 400nm to 500nm, the light transmittance of the coating layer including the titanium pigment is lower by 30% or more, such as 37 to 94% lower, than that of the coating layer including the titanium pigment (titanium pigment is used instead of titanium pigment, other conditions being the same). Thus, the titanium yellow pigment provides better under-protection even at reduced coating thicknesses by allowing a small amount of light to penetrate the coating compared to titanium white pigments.
As used herein, the term "titanium white" pigment means a pigment having a main component (at least 75% by weight of the total solids of the pigment) of TiO 2 Is substantially free of iron oxide. In this context, the term "substantially excluding" means that the content of iron oxide in the titanium white pigment is less than 0.1 wt.%, even, for example, 0 wt.%, based on the total solids weight of the titanium white pigment. In general, titanium white pigments may have the following composition: comprising 90 to 95wt% of TiO based on the total solids weight of the pigment 2 0wt% of ferric oxide, 2 to 4.5wt% of aluminum oxide and 0 to 2wt% of silicon dioxide. The titanium white pigment may have a D50 particle size of less than 0.5 μm. The D50 particle size refers to the median particle size of the particles, which can be obtained by laser particle sizer measurement. Generally, titanium white pigments are surface-treated to avoid agglomeration of particles, so that the pigments are more easily dispersed, and the stability of the surface-treated titanium white pigments is improved.
The titanium yellow pigment according to the present invention can be prepared as a color paste and stored in the form of a color paste for further use in aqueous coating compositions. Typically, the color paste includes pigments, resins, lyes, additives, and/or solvents. Suitably, the mill base of the titanium yellow pigment may comprise titanium yellow pigment, resin, alkali liquor, defoamer and water, wherein the titanium yellow pigment may comprise 40 to 60wt% of the total weight of the mill base. Suitably, the resin may have an acid number of ≡30mg KOH/g. For example, the resin includes a polyester resin having an acid value of 30mg KOH/g or more. The "acid number" refers to the milligrams of potassium hydroxide required to neutralize the free acid in 1 gram of resin.
The coating formed from the aqueous coating composition prepared from the titanium yellow pigment of the present invention may have an L value of not more than 80 obtained according to the CIE1976LAB system. When the coating has an L value of not more than 80 obtained according to the CIE1976LAB system, the aqueous coating composition comprises substantially no titanium white pigment. Herein, the term "substantially excluding" means that the titanium white pigment is present in the coating composition in an amount of less than 0.1wt%, even, for example, 0wt%, based on the total weight of the coating composition.
The aqueous coating compositions prepared from the titanium yellow pigments of the present invention can have a low PVC content. Suitably, the aqueous coating composition prepared from the titanium yellow pigment of the present invention may have a PVC of from 0.03 to 0.3. For example, the aqueous coating composition prepared from the titanium yellow pigment of the present invention may be an automotive coating. Herein, the term "PVC (Pigment Volume Concentration)", also known as pigment volume concentration, refers to the total solids weight of the pigment in the dry film formed from the coating composition to the volume of all non-volatiles in the coating composition, wherein the pigment includes colored pigments and extender pigments (i.e., fillers), and all non-volatiles include resin solids and pigments.
The coating layer formed from the aqueous coating composition prepared from the titanium yellow pigment of the present invention may have a dry film thickness of not more than 100. Mu.m, such as not more than 60. Mu.m, suitably not more than 40. Mu.m, such as 10 to 30. Mu.m, such as 15 to 25. Mu.m. The coating composition may be a first color coating composition of a compact process coating system. The compact process is also referred to as a wet-on-wet process, i.e. a plurality of (at least two) coatings in a coating system are cured in the same step. Generally, the compact paint system includes an electrophoretic panel onto which a first color paint composition, a second color paint composition, and a varnish composition are sprayed.
The aqueous coating composition prepared from the titanium yellow pigment of the present invention may be a one-component composition. In this context, the term "one-component" also referred to as 1K means that all film-forming materials, pigments, fillers, solvents, auxiliaries, etc. of the coating composition are packaged in one container.
The titanium yellow pigment can be used for replacing titanium white pigment and provides good covering property for the coating. The invention therefore also relates to the use of a titanium yellow pigment in an aqueous coating composition for providing hiding properties, wherein the titanium yellow pigment comprises 92 to 96wt% of TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
The titanium yellow pigment according to the present invention has lower light transmittance than titanium white pigment, and thus provides better under-coating at a reduced film thicknessAnd (5) protecting. The invention therefore also relates to the use of a titanium yellow pigment in an aqueous coating composition for enhancing the protection of an underlying coating, wherein the titanium yellow pigment comprises 92 to 96wt% of TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
Further, the present invention also relates to an aqueous coating composition comprising a titanium yellow pigment comprising 92 to 96wt% of TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide. The aqueous coating composition may have a low PVC, suitably 0.03 to 0.3 PVC. The aqueous coating composition forms a coating having a dry film thickness of no more than 100 μm. The aqueous coating composition may form a coating having an L value of no more than 80 obtained according to the CIE1976LAB system. When the coating has an L value of not more than 80 obtained according to the CIE1976LAB system, the aqueous coating composition comprises substantially no titanium white pigment. In this context, the term "substantially excluding" means that the titanium white pigment is present in the coating composition in an amount of less than 0.1wt%, even, for example, 0wt%, based on the total weight of the coating composition.
The aqueous coating composition may also include a color paste of other pigments. For example, the color paste of the other pigment may include a black paste, a yellow paste, a red paste, and/or a blue paste. The values of a and b of the aqueous coating composition (based on the L x a x b color system defined in JIS Z8729) can be adjusted by adding color paste of other colors.
The aqueous coating composition may be used in a compact process coating system as a first color coating composition. The present invention is therefore also directed to a compact process coating system comprising a first color paint composition, wherein the first color paint composition is the aqueous coating composition described above
The present invention is also directed to a substrate coated with the above aqueous coating composition, comprising a substrate and the above aqueous coating composition or the above compact coating system coated over at least a portion of the substrate. Suitably, the substrate may comprise a metal substrate. For example, the substrate is part of a vehicle.
Examples
The following examples are provided to further illustrate the invention but should not be construed to limit the invention to the details set forth in the examples. All parts and percentages in the examples below are by weight unless otherwise indicated.
Example 1:
preparation of aqueous color paste from titanium yellow pigment according to the invention
An aqueous color paste was prepared according to the ingredients and amounts shown in table 1 below, comprising: respectively adding polyester resin, alkali liquor (50%) and deionized water into a stirring tank, and stirring at the speed of 350-550 RPM for 10-15 min; slowly adding the defoaming agent into the mixture, stirring the mixture at the speed of 400 to 600RPM for 10 to 15 minutes, and adjusting the PH to 7.4 to 7.9; adding titanium yellow particles at the stirring speed of 500-700 RPM, gradually increasing the rotating speed to 1000RPM in the feeding process, dispersing for 60 minutes at 800-1200 RPM after the feeding is completed, and adjusting the PH to 8.1-8.5; transferring the color paste to a grinding tank, and grinding at 2000-4000 RPM until the fineness of the Haigeman is at least 7, thus preparing the water-based color paste.
TABLE 1 preparation of aqueous color paste from titanium yellow pigment
a The acid value is more than or equal to 30mgKOH/g;
b 50% N, N-dimethylethanolamine solution;
c BYK-015 from BYK company;
d comprising 95% TiO based on the total solids weight of the pigment 2 、1.7％ Fe 2 O 3 、0.4Al 2 O 3 And 1.25SiO 2 The D50 particle diameter is at least 0.5 mu m, and the relative density is 3.8-4.2 g/cm 3 The oil absorption rate is not more than 22ml/100g.
Comparative example 1:
preparation of aqueous color paste from titanium white pigment
An aqueous color paste was prepared according to the ingredients and levels shown in table 2 below, comprising: respectively adding polyester resin, alkali liquor (50%) and deionized water into a stirring tank, and stirring at the speed of 350-550 RPM for 10-15 min; slowly adding the defoaming agent into the mixture, stirring the mixture at the speed of 400 to 600RPM for 10 to 15 minutes, and adjusting the PH to 7.4 to 7.9; adding titanium white particles at the stirring speed of 500-700 RPM, gradually increasing the rotating speed to 1000RPM in the feeding process, dispersing for 60 minutes at 800-1200 RPM after the feeding is completed, and adjusting the PH to 8.1-8.5; transferring the color paste to a grinding tank, and grinding at 2000-4000 RPM until the fineness of the Haigeman is at least 7, thus preparing the water-based color paste.
TABLE 2 preparation of aqueous color paste from titanium white pigment
| Composition of the components | Content (wt%) |
| Polyester resin a | 27.95 |
| Lye b | 1.10 |
| Defoaming agent c | 0.92 |
| Titanium white d | 64.09 |
| Deionized water | 5.94 |
| Totals to | 100 |
a The acid value is more than or equal to 30mgKOH/g;
b 50% N, N-dimethylethanolamine solution;
c BYK-015 from BYK company;
d BLR-895TITANIUM DIOXIDE PIGMENT。
preparation of aqueous coating compositions
Example 2
35.09g of acrylic resin (SETAQUA 6802), 7.71g of amino resin (CYMEL 327), 6.8g of auxiliary agent (BYK-348 and BYK-015), 4.24g of solvent ethylene glycol butyl ether and 13.36g of water are sequentially added into a stirring tank, the pH is adjusted to 8.0, the mixture is uniformly stirred at a speed of 200-700 RPM, 34.94g of aqueous color paste of example 1 is added, and the viscosity and the pH of the composition are adjusted after stirring at a speed of 200-700 RPM for 2 hours, so as to prepare the aqueous coating composition of example 2.
Comparative example 2
35.09g of acrylic resin (SETAQUA 6802), 7.71g of amino resin (CYMEL 327), 6.8g of auxiliary agent (BYK-348 and BYK-015), 4.24g of solvent ethylene glycol butyl ether and 13.36g of water are sequentially added into a stirring tank, the pH is adjusted to 8.0, the mixture is uniformly stirred at a speed of 200-700 RPM, 29.03g of aqueous color paste of comparative example 1 is added, and the viscosity and the pH of the composition are adjusted after stirring for 2 hours at a speed of 200-700 RPM, so as to prepare the aqueous coating composition of comparative example 2.
Performance test:
1-color
Color of the color paste of the aqueous coating compositions of example 2 and comparative example 2 was determined:
(1) The aqueous coating compositions of example 2 and comparative example 2 were sprayed onto a metal substrate (pretreated and pre-coated) to a dry film thickness of 15 to 20 μm; and
(2) The L, a and b values (l×a×b color system defined based on JIS Z8729) of the coating obtained in step (1) at 45 ° were measured by a commercially available color meter.
It can be seen that the color paste prepared from the titanium yellow pigment according to the present invention can reach a high L value of about 78.
2-UV-visible light transmittance
The aqueous coating compositions of example 2 and comparative example 2 were applied to a glass substrate to a dry film thickness of 15 μm. The cured coating film was subjected to UV-visible light transmittance test: the ratio (%) of light transmitted through the coating film at different wavelengths of incident light to the incident light was determined. The results obtained are shown in FIG. 1: the titanium yellow pigment according to the present invention has a light transmittance of 0 at an incident light wavelength of 290 to 400 nm; the titanium yellow pigment according to the present invention has lower light transmittance than the titanium white pigment at an incident light wavelength of more than 400 nm. For example, at 430nm, the titanium yellow pigment according to the present invention gave a light transmittance of 0.59, and the titanium white pigment under the same conditions gave a light transmittance of 9.74, and the light transmittance of the coating layer of the titanium yellow pigment was 94% lower than that of the coating layer of the titanium white pigment. For example, at 500nm, the titanium yellow pigment according to the present invention gives a light transmittance of 7.78, the titanium white pigment under the same conditions gives a light transmittance of 12.38, and the light transmittance of the coating layer of the titanium yellow pigment is 37% lower than that of the coating layer of the titanium white pigment.
The following construction, appearance and physical mechanical property tests were carried out in a full coating system for the aqueous coating compositions as described above.
The aqueous coating compositions of example 2 and comparative example 2 described above were applied to a substrate to form a coating layer. The specific coating method comprises the following steps:
spraying the aqueous coating compositions of example 2 and comparative example 2 as a first color paint composition onto a metal substrate (pretreated and pre-coated) to a dry film thickness of 15-20 μm; flash-dry at room temperature for at least 5min; coating a commercially available second color paint coating composition SGWFB472BWH1 to a dry film thickness of 18-22 μm; flash-drying at room temperature for at least 5min, and dehydrating at 80deg.C for 8min; coating a commercially available 2K varnish coating composition A-M203788/A-M203791 to a dry film thickness of 45-55 μm; curing was performed at 140 ℃ for 20 min.
3-construction
The pinhole aspect performance of the coating was evaluated with reference to the GMW15119 standard. The values in the table represent the onset of pinhole problems at the coating surface at this film thickness (first color coat). Therefore, the higher the value, the better the pinhole performance.
The sagging aspect of the coating was evaluated with reference to the GMW15119 standard. The values in the table represent the onset of sagging problems at this film thickness (first paint color) at the coating surface. Therefore, the higher the value, the better the sagging aspect.
| Example 2 | Comparative example 2 | |
| Sagging wall | ＞36μm | ＞36μm |
| Pinhole (pinhole) | ＞31μm | ＞31μum |
It can be seen that example 2 and comparative example 2 have excellent workability.
4-appearance
The appearance index of the full coating (i.e., first paint + second paint +2K varnish) was measured using a commercially available orange peel instrument.
Note that: h and V represent horizontal and vertical planes, respectively; du represents tarnish and astringency; lw represents a long wave; sw represents short wave; r represents an appearance integrated value; DOI stands for distinctness of image.
It can be seen that example 2 can achieve an excellent appearance as in comparative example 2.
5-mechanical Properties
The adhesion of the coating was determined with reference to the GMW14829 standard. The test results of 100% represent that the coating was completely smooth at the edges of the cut, without any peeling.
The adhesion of the coating after 60 ℃ x 2 days was measured to evaluate the water soak resistance of the coating, with reference to GMW14704 standard.
The adhesion of the coating after 10 days at 100% RH was measured to evaluate the moisture resistance of the coating, with reference to the GMW14729 standard.
The hardness of the coating was determined with reference to PPG hardness determination standards. The higher the number, the better the hardness.
The stone-chip resistance of the coating was determined with reference to the GMW14700 standard. The higher the number, the better the stone-strike resistance.
Note that: OEM refers to normal process (140 ℃ x 30 min); HBR refers to the high Wen Chongtu process (150 ℃ c. For 30min, and full coating repeated 2 times); LB low temperature baking process (134 ℃ C. 25 min)
It can be seen that example 2 and comparative example 2 can achieve comparable mechanical properties.
From the above, it is understood that the color paste prepared from the titanium yellow pigment according to the present invention can achieve a high L value (l×a×b color system specified based on JIS Z8729); also, the titanium white pigment according to the present invention has lower light transmittance than the titanium white pigment, thus providing better under-coating protection. In addition, the aqueous coating composition prepared by the titanium yellow pigment of the invention has excellent construction, appearance and mechanical properties, is equivalent to the aqueous coating composition containing titanium white pigment in property, and can completely replace the titanium white pigment.
While particular aspects of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (21)
1. Use of a titanium yellow pigment in an aqueous coating composition, wherein the titanium yellow pigment comprises 92 to 96wt% TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
2. The use according to claim 1, wherein the titanium yellow pigment comprises 1.5-2.5wt% iron oxide based on the total solids weight of the pigment.
3. The use according to claim 1 or 2, wherein the titanium yellow pigment has a D50 particle size of at least 0.5 μm.
4. The use according to any one of claims 1 to 3, wherein the titanium yellow pigment has a D50 particle size of 0.8 to 1.2 μm.
5. The use according to any one of claims 1 to 4, wherein the titanium yellow pigment has a content of 3.8 to 4.2g/cm 3 Is a relative density of (c).
6. The use according to any one of claims 1 to 5, wherein the titanium yellow pigment has an oil absorption of not more than 22ml/100g.
7. The use according to any one of claims 1 to 6, wherein the titanium yellow pigment surface is not treated with an organic substance.
8. The use according to any one of claims 1 to 7, wherein the titanium yellow pigment allows lower light transmittance than the titanium white pigment in the wavelength range of more than 400nm to 500 nm.
9. The use according to any one of claims 1 to 8, wherein the aqueous coating composition comprises substantially no titanium white pigment when the coating formed from the coating composition has an L value of not more than 80 obtained according to the CIE1976LAB system.
10. Use according to any one of claims 1 to 9, wherein the aqueous coating composition has a PVC of 0.03 to 0.3.
11. Use according to any one of claims 1 to 10, wherein the aqueous coating forms a coating having a dry film thickness of not more than 100 μm.
12. Use according to any one of claims 1 to 11, wherein the aqueous coating forms a coating having a dry film thickness of not more than 40 μm.
13. The use according to any one of claims 1 to 12, wherein the composition of the aqueous coating is a one-component composition.
14. Use according to any one of claims 1 to 13, wherein the aqueous coating composition is used as a first color composition for compact coating systems.
15. Use of a titanium yellow pigment in an aqueous coating composition for providing hiding properties and/or for enhancing protection of an underlying coating layer, wherein the titanium yellow pigment comprises 92-96 wt% of TiO based on total solids weight of the pigment 2 And 1-3wt% iron oxide.
16. Use of a titanium yellow pigment in an aqueous first color paint composition of a compact process coating system, wherein the titanium yellow pigment comprises 92 to 96wt% TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
17. An aqueous coating composition comprising a titanium yellow pigment comprising 92 to 96wt% TiO based on the total solids weight of the pigment 2 And 1-3wt% iron oxide.
18. A compact process coating system comprising a first color paint composition, wherein the first color paint composition is the aqueous coating composition of claim 17.
19. A coated substrate comprising a substrate and the aqueous coating composition of claim 17 or the compact process coating system of claim 18 coated over at least a portion of the substrate.
20. The coated substrate of claim 19, wherein the substrate comprises a metal.
21. The coated substrate of claim 19 or 20, wherein the substrate comprises a portion of a vehicle.
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| CN112011195A (en) * | 2020-08-29 | 2020-12-01 | 南京汇彩纳米新材料有限公司 | High-performance ferrotitanium yellow inorganic pigment and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112011195A (en) * | 2020-08-29 | 2020-12-01 | 南京汇彩纳米新材料有限公司 | High-performance ferrotitanium yellow inorganic pigment and preparation method thereof |
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| 张熠;陈炳耀;胡小康;陈明毅;黄德;梁光容;: "高钛粉在外墙乳胶漆中的应用研究", 《电镀与涂饰》, no. 02, pages 70 - 73 * |
| 杨宗志: "钛黄粉颜料在涂料中的应用", 《化工时刊》, no. 10, pages 19 - 22 * |
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