CN112724804A - Powder coating composition with color changing effect and coating thereof - Google Patents
Powder coating composition with color changing effect and coating thereof Download PDFInfo
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- CN112724804A CN112724804A CN202011599596.3A CN202011599596A CN112724804A CN 112724804 A CN112724804 A CN 112724804A CN 202011599596 A CN202011599596 A CN 202011599596A CN 112724804 A CN112724804 A CN 112724804A
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- 239000000843 powder Substances 0.000 title claims abstract description 167
- 238000000576 coating method Methods 0.000 title claims abstract description 119
- 239000011248 coating agent Substances 0.000 title claims abstract description 118
- 230000000694 effects Effects 0.000 title claims abstract description 57
- 239000008199 coating composition Substances 0.000 title claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 58
- 239000002245 particle Substances 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 27
- 229920001225 polyester resin Polymers 0.000 claims description 21
- 239000004645 polyester resin Substances 0.000 claims description 21
- 239000006229 carbon black Substances 0.000 claims description 13
- JHYNXXDQQHTCHJ-UHFFFAOYSA-M ethyl(triphenyl)phosphanium;bromide Chemical compound [Br-].C=1C=CC=CC=1[P+](C=1C=CC=CC=1)(CC)C1=CC=CC=C1 JHYNXXDQQHTCHJ-UHFFFAOYSA-M 0.000 claims description 10
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 3
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 description 14
- 238000001514 detection method Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000007872 degassing Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 229920013685 Estron Polymers 0.000 description 5
- DNXHEGUUPJUMQT-CBZIJGRNSA-N Estrone Chemical compound OC1=CC=C2[C@H]3CC[C@](C)(C(CC4)=O)[C@@H]4[C@@H]3CCC2=C1 DNXHEGUUPJUMQT-CBZIJGRNSA-N 0.000 description 5
- 241000282376 Panthera tigris Species 0.000 description 5
- 229960003399 estrone Drugs 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
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- 230000000007 visual effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 241000122205 Chamaeleonidae Species 0.000 description 1
- -1 aluminum silver Chemical compound 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009257 reactivity Effects 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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/032—Powdery paints characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/29—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for multicolour effects
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/36—Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre
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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)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a powder coating composition with a color-changing effect, which comprises a powder coating base powder composition and color-changing pearl powder compounded on the powder coating base powder composition particles through thermal bonding; the powder coating base powder composition adopts a dark color, gray color or black color powder coating composition, wherein the L value of a cured coating film of the powder coating base powder composition is not higher than 35; the invention also discloses a coating with a color-changing effect, wherein the powder coating composition with the color-changing effect is sprayed on a base material and then cured to obtain the coating, and the PCI leveling grade of the coating is not lower than 7 grade; according to the invention, through the specific design of the L value of the powder coating base powder composition, the color-changing pearl powder uniformly compounded on the surface of the cured coating film realizes unique gorgeous color-changing effect at different angles.
Description
Technical Field
The invention belongs to the field of powder coating, and particularly relates to a powder coating composition with a color-changing effect, and a coating using the powder coating composition.
Background
The thermosetting powder coating has the advantages of environmental protection, low energy consumption, convenient construction, no VOC emission and the like, so the thermosetting powder coating is widely used for replacing paint and water-based paint to realize the protection and decoration of various material substrates. People hope to utilize the thermosetting powder coating to realize not only the protective effect on the base material, but also better, rich and gorgeous and changeable decorative effect, and specifically, the color effect of the cured coating can be changed in various ways under different visual angles, so that the surface coating effect similar to 'chameleon' is realized.
At present, some technologies have been used to realize the effect of color change of a coating along with a viewing angle by using bonding color-changing pearl powder, for example, the invention patent of CN111560209A discloses a powder coating with skin feeling and color-changing function along with a viewing angle, the color-changing pearl powder and aluminum silver powder are bonded to powder coating base powder (barium sulfate filler is used, which is white in color) by bonding, and the color-changing effect of the technical scheme is still brought by the pure color-changing pearl powder, so the cured coating film thereof cannot realize the gorgeous and changeable color-changing effect.
The applicant therefore sought a technical solution to increase the level of discoloration effect obtained by the cured coating of powder coatings.
Disclosure of Invention
In view of the above, the present invention aims to provide a powder coating composition with a color-changing effect and a coating thereof, wherein the L value of the powder coating base powder composition is specifically designed, such that the color-changing pearl powder uniformly compounded on the surface of the cured coating film realizes unique flowery color-changing effects at different angles.
The technical scheme adopted by the invention is as follows:
a powder coating composition with a color-changing effect comprises a powder coating base powder composition and color-changing pearl powder compounded on the particles of the powder coating base powder composition through thermal bonding; the powder coating base powder composition adopts a dark color, gray color or black color powder coating composition, wherein the L value of a cured coating film of the powder coating base powder composition is not higher than 35.
Preferably, the powder coating primer composition has an L value in the range of 25 to 30.
Preferably, the color-changing pearl powder accounts for 1 to 5 weight percent of the powder coating base powder composition.
Preferably, the powder coating primer composition comprises carbon black.
Preferably, the carbon black is present in an amount of 0.2 to 2.5 weight percent based on the weight of the powder coating primer composition.
Preferably, the average particle size of the color-changing pearl powder is in the range of 10 to 60 micrometers.
Preferably, the powder coating base powder composition at least comprises 65-90 wt% of polyester resin, 2-15 wt% of curing agent and 0.5-2 wt% of leveling agent.
Preferably, the curing accelerator also comprises 0.2-1 wt% of curing accelerator, wherein the curing accelerator comprises ethyl triphenyl phosphonium bromide.
Preferably, the cure accelerator is in the form of a compounded masterbatch.
Preferably, the acid value of the polyester resin is not higher than 50mgKOH/g, and the detection standard of the acid value data referred to in the present application is ISO 3682-1998.
Preferably, the coating with the color-changing effect is obtained by spraying the powder coating composition with the color-changing effect on a substrate and then curing, wherein the PCI leveling grade of the coating is not lower than 7 grade; the PCI leveling grade is specifically determined by performing visual comparison on a coating film to be tested and a PCI leveling grade comparison plate (0-10 grade) to determine the corresponding leveling grade of the coating film to be tested, and belongs to a leveling grade determination method which is popular in the industry.
The L value referred to in the present application is L value data of a cured coating film detected by a Datacolor colorimeter, the L value data being from an Lab color model and being an International standard for measuring color defined by the Commission International Eclairage (CIE), wherein the L value represents lightness of color, and the smaller the L value, the darker the representative color; the average particle size data referred to in the present application is D50 data obtained by a particle size distribution test using a malvern particle size analyzer 2000.
The application creatively proposes to adopt a powder coating composition with a cured coating L value not higher than 35 as base powder, the base powder is embodied as dark color, gray color or black color, and the base powder under the color system condition is further thermally bonded and compounded with color-changing pearl powder with a color-changing effect, and the applicant discovers after analysis that: the cured coating film with the L value not higher than 35 can efficiently and quickly absorb the illumination of each external wavelength band, so that the color-changing pearl powder uniformly compounded on the surface of the cured coating film realizes unique gorgeous color-changing effect at different angles, and the color-changing pearl powder has obvious difference from the simple color-changing effect of simply adopting the bonding color-changing pearl powder.
Drawings
FIG. 1 is a photograph of the appearance effect of a coating having a color change effect according to an embodiment of the present invention.
Detailed Description
The embodiment provides a powder coating composition with a color-changing effect, which comprises a powder coating base powder composition and color-changing pearl powder compounded on the powder coating base powder composition particles through thermal bonding; the powder coating base powder composition adopts a dark color, gray color or black color powder coating composition, wherein the L value of a cured coating film of the powder coating base powder composition is not higher than 35; preferably, the powder coating base powder composition comprises carbon black, and the L value of the powder coating base powder composition is adjusted in a proper range through the carbon black to ensure that the L value of a cured coating film is not higher than 35; preferably, the carbon black is present in an amount of 0.2 to 2.5%, more preferably 0.5 to 2%, and even more preferably 0.8 to 1.5% by weight of the powder coating base powder composition; preferably, the powder coating base powder composition has an L value in the range of 25 to 30.
Preferably, the color-changing pearlescent powder accounts for 1-5 wt%, more preferably 1-3 wt%, and even more preferably 1.5-2.5 wt% of the powder coating base powder composition by weight; the average particle size of the color-changing pearl powder is in the range of 10 to 60 microns, and more preferably 20 to 40 microns.
Preferably, the powder coating base powder composition at least comprises 65-90 wt% of polyester resin, 2-15 wt% of curing agent and 0.5-2 wt% of leveling agent, so that the cured coating film obtains excellent leveling property; in order to improve the reactivity between the polyester resin and the curing agent, the powder coating base powder composition further comprises 0.2-1 wt% of a curing accelerator, wherein the curing accelerator comprises ethyl triphenyl phosphonium bromide, and as the actual addition amount of the ethyl triphenyl phosphonium bromide is only 0.02-0.1 wt%, in order to facilitate dispersion, the curing accelerator in the embodiment adopts a mixed master batch form, and specifically, the ethyl triphenyl phosphonium bromide and the polyester resin can be subjected to melt mixing to obtain a mixed master batch; further preferably, in order to facilitate the leveling property of the cured coating film, the acid value of the polyester resin is not higher than 50mgKOH/g, preferably, the acid value of the polyester resin is 25 to 45mgKOH/g, more preferably 30 to 40 mgKOH/g; the acid number data detection standard referred to in this application is ISO 3682-1998.
In the specific implementation of the application, a degassing agent, a dispersing agent, a defoaming agent or other auxiliary agents can be optionally added into the powder coating base powder composition; other suitable resin curing systems with similar good leveling properties can also be selected as the main raw material of the powder coating base powder composition, and unique gorgeous color-changing effect can also be obtained and also fall into the protection scope of the application.
The powder coating primer composition of this example can be obtained by known process preparation techniques, which typically include: the powder coating base powder composition of the present embodiment can be obtained by weighing, premixing, melt extrusion, grinding, cyclone separation, and other processes, and other known preparation processes can be used, and the preparation process is not particularly limited in the present application; the color-changing pearl powder can be thermally bonded and compounded with the powder coating base powder composition by a well-known thermal bonding and bonding process.
This example also provides a coating having a color-changing effect, which is obtained by spraying the powder coating composition having a color-changing effect as described above onto a substrate and then curing the composition, wherein the PCI leveling grade of the coating is not less than 7. The coating thickness of the embodiment can be specifically selected according to actual needs, and the recommended coating thickness range is 60-120 μm (the test standard is according to ISO 2360 and 2017).
In order to verify the technical effect of the application, the application particularly performs specific test performance comparison on the following groups of examples:
example 1: a powder coating composition with a color-changing effect comprises a powder coating base powder composition and color-changing pearl powder compounded on the particles of the powder coating base powder composition through thermal bonding; the powder coating base powder composition comprises the following raw materials:
90 wt% of polyester resin, the specific types are: uralac P865 for DSM;
7 wt% TGIC (triglycidyl isocyanurate) curing agent;
0.6 wt% of a master batch of a mixture of ethyltriphenylphosphonium bromide and a polyester resin, prepared in advance by a tiger;
1 wt% of a leveling agent, the specific types are as follows: RESIFLOW PV-67C of ESTRON;
1 wt% carbon black;
0.4 wt% of a degassing agent.
The powder coating base powder composition is prepared by the procedures of weighing, premixing, melt extrusion, grinding, cyclone separation and the like of the raw materials, the color-changing pearl powder with the model number of KSL61334M is selected, and the color-changing pearl powder is uniformly and thermally bonded on the powder coating base powder composition particles through a known bonding process, so that the powder coating composition with the color-changing effect is finally obtained.
And then spraying the powder coating composition with the color-changing effect on a sample of the metal substrate, and curing (180 ℃ for 10 minutes) to obtain a coating with the color-changing effect, wherein the PCI leveling grade of the coating is 9 grades, the L value is 26, and the coating realizes the gorgeous color-changing effect at different angles (see fig. 1).
Example 2: the remaining technical solution of this example 2 is the same as that of example 1, except that in this example 2, the raw materials of the powder coating base powder composition include the following:
91 wt% of polyester resin, the specific types are: uralac P865 for DSM;
7 wt% TGIC (triglycidyl isocyanurate) curing agent;
0.6 wt% of a master batch of a mixture of ethyltriphenylphosphonium bromide and a polyester resin, prepared in advance by a tiger;
1 wt% carbon black;
0.4 wt% of a degassing agent.
Through detection, the PCI leveling grade of the coating is 8 grade, the L value is 26, and the coating realizes gorgeous and changeable color changing effect under different angles.
Example 3: the remaining technical solution of this example 3 is the same as that of example 1, except that in this example 3, the raw materials of the powder coating base powder composition include the following:
90.6 wt% of polyester resin, the specific types are: uralac P865 for DSM;
7 wt% TGIC (triglycidyl isocyanurate) curing agent;
1 wt% of a leveling agent, the specific types are as follows: RESIFLOW PV-67C of ESTRON;
1 wt% carbon black;
0.4 wt% of a degassing agent.
Through detection, the PCI leveling grade of the coating is 8 grade, the L value is 26, and the coating realizes gorgeous and changeable color changing effect under different angles.
Example 4: the remaining technical solution of this example 4 is the same as that of example 1, except that in this example 4, the raw materials of the powder coating base powder composition include the following:
91.6 wt% of polyester resin, the specific types are: uralac P865 for DSM;
7 wt% TGIC (triglycidyl isocyanurate) curing agent;
1 wt% carbon black;
0.4 wt% of a degassing agent.
Through detection, the PCI leveling grade of the coating is 7 grade, the L value is 26, and the coating realizes gorgeous and changeable color changing effect under different angles.
Example 5: the remaining technical solution of this example 5 is the same as that of example 1, except that in this example 5, the raw materials of the powder coating base powder composition include the following:
89 wt% of polyester resin, the specific types are: uralac P865 for DSM;
7 wt% TGIC (triglycidyl isocyanurate) curing agent;
0.6 wt% of a master batch of a mixture of ethyltriphenylphosphonium bromide and a polyester resin, prepared in advance by a tiger;
1 wt% of a leveling agent, the specific types are as follows: RESIFLOW PV-67C of ESTRON;
2 wt% carbon black;
0.4 wt% of a degassing agent.
Through detection, the PCI leveling grade of the coating is 9 grade, the L value is 25, and the coating realizes gorgeous and changeable color changing effect under different angles.
Example 6: the remaining technical solution of this example 6 is the same as that of example 1, except that in this example 6, the raw materials of the powder coating base powder composition include the following:
90.5 wt% of polyester resin, the specific types are: uralac P865 for DSM;
7 wt% TGIC (triglycidyl isocyanurate) curing agent;
0.6 wt% of a master batch of a mixture of ethyltriphenylphosphonium bromide and a polyester resin, prepared in advance by a tiger;
1 wt% of a leveling agent, the specific types are as follows: RESIFLOW PV-67C of ESTRON;
0.5 wt% carbon black;
0.4 wt% of a degassing agent.
Through detection, the PCI leveling grade of the coating is 9 grade, the L value is 28, and the coating realizes gorgeous and changeable color changing effect under different angles.
Example 7: the remaining technical solutions of this embodiment 7 are the same as those of embodiment 1, except that in this embodiment 7, a color-changing pearl powder with a model number of KSL61512M is selected; through detection, the PCI leveling grade of the coating is 9 grade, the L value is 26, and the coating realizes gorgeous and changeable color changing effect under different angles.
Example 8: the remaining technical solutions of this embodiment 8 are the same as those of embodiment 1, except that in this embodiment 8, a color-changing pearl powder with a model number of KSL61523M is selected; through detection, the PCI leveling grade of the coating is 9 grade, the L value is 26, and the coating realizes gorgeous and changeable color changing effect under different angles.
Example 9: the remaining technical solutions of this embodiment 9 are the same as those of embodiment 1, except that in this embodiment 9, a color-changing pearl powder with a model number of KSL62284M is selected; through detection, the PCI leveling grade of the coating is 9 grade, the L value is 26, and the coating realizes gorgeous and changeable color changing effect under different angles.
Comparative example 1: the remaining technical solution of comparative example 1 is the same as that of example 1, except that in comparative example 1, the powder coating base powder composition comprises the following raw materials:
91 wt% of polyester resin, the specific types are: uralac P865 for DSM;
7 wt% TGIC (triglycidyl isocyanurate) curing agent;
0.6 wt% of a master batch of a mixture of ethyltriphenylphosphonium bromide and a polyester resin, prepared in advance by a tiger;
1 wt% of a leveling agent, the specific types are as follows: RESIFLOW PV-67C of ESTRON;
0.4 wt% of a degassing agent.
The PCI leveling grade of the coating is 9 grades, the L value is 70, and the surface of the coating has no gorgeous color change effect as in examples 1-8.
Comparative example 2: the embodiment of CN111560209A is adopted in the comparative example 2; the PCI leveling grade of the coating is 9, the L value is 65, and the surface of the coating has no gorgeous color change effect as in examples 1-8.
Comparative example 3: the rest technical scheme of the comparative example 3 is the same as that of the example 1, except that in the comparative example 3, the conventional black sand grain type powder coating base powder composition is adopted; the PCI leveling grade of the coating is 3, the L value is 26, and the surface of the coating has no gorgeous color change effect as in examples 1-8.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (11)
1. A powder coating composition with a color-changing effect comprises a powder coating base powder composition and color-changing pearl powder compounded on the particles of the powder coating base powder composition through thermal bonding; the powder coating base powder composition is a dark, gray or black powder coating composition, wherein the L value of a cured coating film of the powder coating base powder composition is not higher than 35.
2. Powder coating composition with a colour change effect according to claim 1, characterised in that the powder coating base powder composition has an L value in the range of 25-30.
3. The powder coating composition with color-changing effect according to claim 1, wherein the color-changing pearl powder accounts for 1-5 wt% of the powder coating base powder composition.
4. Powder coating composition with a colour change effect according to claim 1, characterised in that the powder coating base powder composition comprises carbon black.
5. Powder coating composition with a colour change effect according to claim 4, characterised in that the carbon black is present in an amount of 0.2-2.5 wt% based on the weight of the powder coating base powder composition.
6. The powder coating composition with color-changing effect according to claim 1, wherein the color-changing pearl powder has an average particle size ranging from 10 to 60 μm.
7. The powder coating composition with color-changing effect according to claim 1, wherein the powder coating primer composition comprises at least 65-90 wt% of polyester resin, 2-15 wt% of curing agent and 0.5-2 wt% of leveling agent.
8. A powder coating composition with a colour change effect according to claim 7, further comprising 0.2-1 wt% of a curing accelerator, wherein the curing accelerator comprises ethyltriphenylphosphonium bromide.
9. Powder coating composition with a colour change effect according to claim 8, characterised in that the curing accelerator is in the form of a compounded masterbatch.
10. A powder coating composition with a colour change effect according to claim 7, characterised in that the acid value of the polyester resin is not higher than 50 mgKOH/g.
11. A coating having a color-changing effect, which is obtained by spraying the powder coating composition having a color-changing effect according to any one of claims 1 to 10 onto a substrate and then curing, and which has a PCI leveling grade of not less than 7.
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| CN202011599596.3A CN112724804A (en) | 2020-12-29 | 2020-12-29 | Powder coating composition with color changing effect and coating thereof |
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| CN202011599596.3A CN112724804A (en) | 2020-12-29 | 2020-12-29 | Powder coating composition with color changing effect and coating thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115895406A (en) * | 2022-12-20 | 2023-04-04 | 老虎表面技术新材料（清远）有限公司 | A metal powder coating composition with imitation electroplating effect and coating thereof |
| CN115895405A (en) * | 2022-12-20 | 2023-04-04 | 老虎表面技术新材料（清远）有限公司 | Laser effect powder coating composition and coating thereof |
| WO2023116737A1 (en) * | 2021-12-23 | 2023-06-29 | 老虎表面技术新材料（苏州）有限公司 | Method for testing use stability of effect powder coating composition during electrostatic spraying process |
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| CN115895405A (en) * | 2022-12-20 | 2023-04-04 | 老虎表面技术新材料（清远）有限公司 | Laser effect powder coating composition and coating thereof |
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