CN115895406A - Metal powder coating composition with electroplating-like effect and coating thereof - Google Patents
Metal powder coating composition with electroplating-like effect and coating thereof Download PDFInfo
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Abstract
The invention discloses an electroplating effect imitating metal powder coating composition and a coating thereof, and the electroplating effect imitating metal powder coating composition comprises a powder coating transparent base powder composition and a floating type aluminum effect pigment which are mixed into a whole, wherein the raw materials of the powder coating transparent base powder composition comprise polyester resin and a curing agent for curing the polyester resin, the viscosity range of the polyester resin at 200 ℃ is 1500-2500mPa.s, and the acid value of the polyester resin is not higher than 45mgKOH/g; the invention can obtain the imitation plating effect coating which is close to the liquid paint, and can be used as an environment-friendly substitute product of the existing imitation plating liquid paint.
Description
Technical Field
The invention belongs to the field of powder coating, and particularly relates to a plating effect imitating metal powder coating composition.
Background
The thermosetting powder coating has the advantages of environmental protection, low energy consumption, convenient construction, no (at least little) VOC emission and the like, so the thermosetting powder coating is widely used for replacing paint and water-based paint to realize protection and decoration of products in various fields.
In order to enrich the decorative effect of thermosetting powder coatings and make the decorative effect of thermosetting powder coatings closer to the decorative effect of paint, various effect pigments are added into the thermosetting powder coatings, and the thermosetting powder coatings are mixed with the thermosetting powder coatings in a blending or bonding process mode during preparation. However, the conventional thermosetting powder coatings still have a significant gap from the imitation plating effect achieved by the existing commercial imitation plating liquid paint products.
In order to improve the imitation plating effect of the effect thermosetting powder coating, the invention patent application with publication number CN112724802A discloses an imitation plating effect metal powder coating composition, and proposes that an aluminum effect pigment coated with a silicon dioxide layer is adopted as a specific effect pigment to obviously improve the glossiness of a cured coating, thereby improving the level of the imitation plating effect.
As the applicant has further developed this subject, it is desirable to find other suitable powder coating composition formulations to further enhance the level of imitation plating effect of an effective thermosetting powder coating.
Disclosure of Invention
In view of the above, the present invention aims to provide a plating-imitating metal powder coating composition and a coating thereof, which have excellent plating-imitating effect and can be used as an environment-friendly substitute for the existing plating-imitating liquid paint.
The technical scheme adopted by the invention is as follows:
the electroplating effect imitating metal powder coating composition comprises a powder coating transparent base powder composition and a floating type aluminum effect pigment which are mixed into a whole, wherein the raw materials of the powder coating transparent base powder composition comprise a polyester resin and a curing agent for curing the polyester resin, the viscosity of the polyester resin at 200 ℃ ranges from 1500 to 2500mPa.s, and the acid value of the polyester resin is not higher than 45mgKOH/g.
Preferably, the polyester resin has a viscosity ranging from 1500 to 2300mPa.s at 200 ℃ and an acid value ranging from 25 to 40mgKOH/g.
Preferably, the polyester resin accounts for not less than 70wt% of the powder coating transparent base powder composition by weight.
Preferably, the proportion of the curing agent in parts by weight of the polyester resin is in the range of 2 to 15wt%.
Preferably, the curing agent comprises TGIC.
Preferably, the leafing aluminum effect pigment is present in a weight ratio ranging from 0.2 to 2wt% of the powder coating clear base powder composition.
Preferably, the leafing aluminum effect pigment has an average particle size in the range of no more than 10 microns.
Preferably, the floating aluminum effect pigment is compounded with the powder coating transparent base powder into a whole through thermal bonding.
Preferably, the electroplating effect imitating coating is obtained by spraying and curing the electroplating effect imitating metal powder coating composition on a substrate, and the DOI value of the electroplating effect imitating coating is not lower than 70 according to the test of ASTM D5767-2017.
Preferably, the electroplating-effect-imitating coating comprises an electroplating-effect-imitating single-coating obtained by spraying and curing the electroplating-effect-imitating metal powder coating composition on a substrate and a transparent finishing coating positioned on the outer surface of the electroplating-effect-imitating single-coating.
It should be noted that throughout this application reference is made to viscosity measurements based on ASTM D4287-1994 using standard commercial CONE and PLATE VISCOMETERs (e.g., ICI CONE and PLATE VISCOMETER (CONE & PLATE) under the CAP 2000VISCOMETER from Brookfield); the acid value detection standard is according to ISO 3682-1998; reference to mean particle size data is made to D50 data obtained from a particle size distribution test using laser diffraction (e.g. using malvern particle size analyser 2000).
It should be noted that DOI referred to in this application refers to the abbreviation of the distinguishment of image, and the meaning in chinese is: surface distinctness of image.
The application proposes that a specific polyester resin with the viscosity range of 1500-2500mPa.s at 200 ℃ and the acid value of not more than 45mgKOH/g is adopted as a key raw material of a powder coating transparent base powder composition, the powder coating transparent base powder composition and a floating aluminum effect pigment are mixed to obtain a metal powder coating composition, and the metal powder coating composition is sprayed and cured to obtain a cured coating.
Drawings
FIG. 1 is a photograph of a coating material with an imitation plating effect according to example 1.
Detailed Description
The embodiment of the application provides an electroplating effect imitating metal powder coating composition, which comprises a powder coating transparent base powder composition and a floating type aluminum effect pigment which are mixed into a whole.
In the present embodiment, the raw materials of the powder coating transparent base powder composition include a polyester resin, and a curing agent for curing the polyester resin, wherein the polyester resin has a viscosity ranging from 1500 to 2500mpa.s at 200 ℃ and an acid value of not higher than 45mgKOH/g; preferably, the polyester resin has a viscosity at 200 ℃ in the range of 1500 to 2300mPa.s and an acid value in the range of 25 to 40mgKOH/g, more preferably 30 to 40mgKOH/g, and still more preferably 32 to 38mgKOH/g.
Preferably, in this embodiment, the polyester resin accounts for no less than 70wt%, more preferably 75 to 97wt%, and still more preferably 80 to 95wt% of the powder coating transparent base powder composition; preferably, in the present embodiment, the proportion of the curing agent in parts by weight of the polyester resin is in the range of 2 to 15wt%, more preferably 3 to 12wt%, and still more preferably 5 to 10wt%.
In the present embodiment, the curing agent may be any known curing agent selected according to the thermosetting resin actually selected, as long as the curing agent is ensured to be capable of sending a crosslinking curing reaction with the thermosetting resin; preferably, in this embodiment, the curing agent may include TGIC (triglycidyl isocyanurate) and/or hydroxyalkyl amide (e.g., primid) and/or isocyanate compound, wherein the isocyanate compound in this embodiment further includes blocked isocyanate, latent isocyanate, uretdione, and the like; one skilled in the art can select a suitable curing agent depending on the thermosetting resin selected; more preferably, in this embodiment, the curing agent comprises TGIC; more preferably, the curing agent is entirely TGIC.
In the present embodiment, various known additives, such as a known leveling agent, a degassing agent, an antioxidant, a dispersant, a filler, a wax, a stabilizer, other pigments and/or other additives, may be added to the powder coating transparent base powder composition according to the actual application requirements, and these are selected by the ordinary skill of those skilled in the art.
In the present embodiment, the raw materials of the powder coating transparent base powder composition, for example, the polyester resin, the curing agent, the auxiliary agent, and the like, can be purchased directly on the market, and the raw material sources are easily available.
In the present embodiment, when preparing the powder coating transparent base powder composition, the powder coating transparent base powder composition can be obtained by a known process preparation technique, wherein the known process preparation technique generally comprises: the powder coating transparent base powder composition of the present example can be obtained by the following steps of weighing, premixing, melt extrusion, pulverizing, cyclone separation, etc., and other known production processes can be used.
Preferably, in this embodiment, the leafing aluminum effect pigment comprises in the powder coating clear base powder composition a weight fraction in the range of 0.2 to 2wt%, more preferably 0.5 to 2wt%, even more preferably 0.5 to 1.5wt%; preferably, in this embodiment, the leafing aluminum effect pigment has an average particle size in the range of no more than 10 microns, more preferably in the range of no more than 8 microns; considering that the manufacturing process is not only difficult but also has potential safety hazard when the average particle size of the leafing aluminum effect pigment is less than 3 microns, it is further preferable that the average particle size of the leafing aluminum effect pigment is in the range of 3-6 microns; specifically, in the present embodiment, any known commercially available floating ALUMINUM effect pigment may be used, such as the aluninum POWDER pigment 2091 available from Benda-lutz and having an average particle size of 5 microns; PC200 from ECKART having an average particle size of 4 microns may also be selected.
Preferably, in the embodiment, the floating aluminum effect pigment is combined with the powder coating transparent base powder into a whole through a thermal bonding process, and the thermal bonding process is favorable for the uniform floating effect of the floating aluminum effect pigment on the surface of the cured coating, so that the cured coating has excellent DOI value mirror texture performance. In the present embodiment, any known thermal bonding process can be used, and the present embodiment is not particularly limited thereto.
Preferably, the embodiment also provides a plating effect imitating coating which is obtained by spraying and curing the plating effect imitating metal powder coating composition on a substrate.
Preferably, the embodiment also provides a plating effect imitating coating, wherein a solidified coating obtained by spraying and solidifying the plating effect imitating metal powder coating composition on a substrate is used as a plating effect imitating single-coating; in order to improve the chemical resistance and surface resistance of the imitation electroplating effect single-coating layer, in the present embodiment, a transparent finishing coating layer is further disposed on the surface of the imitation electroplating effect single-coating layer, specifically, a known transparent finishing coating layer may be used, and this embodiment is not particularly limited thereto.
In the present embodiment, the substrate may be a metal substrate or a non-metal substrate; preferably, in the present embodiment, the substrate is a metal substrate, and more preferably, an aluminum substrate or a ferrous substrate.
In the present embodiment, the DOI value of the plating effect imitation coating measured according to ASTM D5767-2017 is not less than 70, preferably not less than 75, more preferably not less than 80, and still more preferably 80-90.
In the embodiment, the thickness of the imitation electroplating effect coating can be specifically selected according to actual needs, and the recommended coating thickness range is 60-120 μm (the test standard is ISO 2360-2017).
In order to further verify the technical effect of the application, the application particularly carries out specific test performance comparison by taking the following groups of examples as formula raw materials of the metal powder coating composition with the imitation electroplating effect:
example 1: an imitation galvanic effect metal POWDER coating composition comprising 98wt% of a POWDER coating clear base POWDER composition, and 2wt% of a leafing ALUMINUM effect pigment (available under the trade designation ALUMINUM POWDER2091 from Benda-lutz, with an average particle size of 5 microns); the floating aluminum effect pigment is mixed with the base powder coating composition by a known bonding process to achieve thermal bonding, so as to obtain the imitation electroplating effect metal powder coating composition, wherein preferably, in the bonding process of the embodiment 1, the thermal bonding time is about 2 minutes, and the thermal bonding temperature is about 50 ℃.
In this example 1, the powder coating clear base composition was formulated with 92% by weight of a polyester resin having a brand number of
4642-3, having a viscosity at 200 ℃ ranging from 1500 to 2300mPa.s and an acid value ranging from 32 to 38mgKOH/g;6wt% of TGIC with the trade mark of HT-702 of Huangshan Huahui; 1.5wt% of leveling agent with the brand name of Resifflow PL-200from ESCRON; 0.5wt% of a degassing agent, in particular benzoin (a conventional commercially available product); the transparent base powder composition for the powder coating is prepared by the following working procedures of weighing, premixing, melt extrusion, grinding, cyclone separation and the like of the raw materials of the formula.
Example 2: the rest of the technical scheme of the embodiment 2 is the same as the embodiment 1, except that in the embodiment 2, the formulation raw materials of the powder coating transparent base powder composition comprise 90.5wt% of polyester resin; 7wt% Primid curing agent under the trade designation Primid XL-552from EMS Primid;2wt% of a leveling agent; 0.5wt% of a degassing agent.
Example 3: the rest of the technical scheme of the embodiment 3 is the same as the embodiment 1, except that in the embodiment 3, the formula raw materials of the transparent base powder composition of the powder coatingComprising 85wt% of a polyester resin; 6wt% TGIC;1wt% of a leveling agent; 0.5wt% of a degassing agent; 0.5wt% of a dispersant having the trade name DISPERZAID AT65-P from POLYSS; the balance being BaSO 4 A filler; the total is 100wt%.
Example 4: the rest of the technical scheme of this example 4 is the same as that of example 1, except that in this example 4, the formulation raw materials of the powder coating transparent base powder composition comprise 80wt% of polyester resin; 7wt% TGIC;1wt% of a leveling agent; 1wt% of a degassing agent; the balance being BaSO 4 A filler; the total is 100wt%.
Example 5: the rest of the technical scheme of the embodiment 5 is the same as the embodiment 1, except that in the embodiment 5, the formulation raw materials of the powder coating transparent base powder composition comprise 75wt% of polyester resin; 7wt% TGIC;1wt% of a leveling agent; 1wt% of a degassing agent; the balance being BaSO 4 A filler; the total is 100wt%.
Example 6: the rest of the technical scheme of this example 6 is the same as that of example 1, except that in this example 6, the formulation raw materials of the powder coating transparent base powder composition comprise 70wt% of polyester resin; 7wt% TGIC;1wt% of a leveling agent; 1wt% of a degassing agent; the balance being BaSO 4 A filler; the total is 100wt%.
Example 7: the remaining technical solutions of this example 7 are the same as example 1, except that in this example 7, the formulation raw materials of the powder coating transparent base powder composition include 65wt% of polyester resin; 7wt% TGIC;1wt% of a leveling agent; 1wt% of a degassing agent; the balance being BaSO 4 A filler; the total is 100wt%.
Example 8: the rest of the technical solution of this example 8 is the same as that of example 1, except that in this example 8, the formulation raw materials of the powder coating transparent base powder composition include 95wt% of polyester resin; 5wt% TGIC.
Example 9: the remaining technical solution of this example 9 is the same as that of example 1, except that in this example 9, the formulation of the powder coating transparent primer composition comprises 92wt% of another polyester resin (Allnex brand)
4430-0), which has a viscosity at 200 ℃ in the range of 1500-2500mPa.s, and an acid value in the range of 35-40mgKOH/g.
Example 10: the remaining technical solution of this example 10 is the same as that of example 1, except that in this example 10, the formulation of the powder coating transparent ground powder composition comprises 92wt% of another polyester resin (CE 3999F brand Nardostachys), which has a viscosity ranging from 1000 to 2500mPa.s at 200 ℃ and an acid value ranging from 32 to 38mgKOH/g.
Example 11: the remaining technical solution of this example 11 is the same as that of example 1, except that in this example 11, 97wt% of the powder coating transparent base powder composition and 3wt% of the leafing aluminum effect pigment are included.
Example 12: the remaining technical solution of this example 12 is the same as that of example 1, except that in this example 12, 98.5wt% of the powder coating transparent base powder composition and 1.5wt% of the leafing aluminum effect pigment are included.
Example 13: the remaining technical solution of this example 13 is the same as that of example 1, except that in this example 13, 99.5wt% of the powder coating transparent base powder composition and 0.5wt% of the leafing aluminum effect pigment are included.
Example 14: the remaining technical solution of this example 14 is the same as that of example 1, except that in this example 14, 99.8wt% of the powder coating transparent base powder composition and 0.2wt% of the leafing aluminum effect pigment are included.
Example 15: the remaining technical solution of this example 15 is the same as that of example 1, except that in this example 15, 99.9wt% of the powder coating clear base powder composition is included, and 0.1wt% of the leafing aluminum effect pigment.
Example 16: the remaining technical solution of this example 16 is the same as that of example 1 except that in this example 16, 98wt% of the powder coating clear base powder composition is included, and 2wt% of the leafing aluminum effect pigment (brand PC200 from ECKART, with an average particle size of 4 microns).
Example 17: the remaining technical solution of this example 17 is the same as that of example 1, except that in this example 17, 98wt% of the powder coating transparent base powder composition is included, and 2wt% of the leafing aluminum effect pigment (trade mark Powdal @8500HC from SCHENK, its average particle size is 15 microns).
Example 18: the remaining technical solution of this example 18 is the same as that of example 1, except that in this example 18, the leafing aluminum effect pigment and the powder coating clear base powder composition are mixed together by a dry blending process.
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 formulation raw materials of the powder coating transparent base powder composition include 92wt% of polyester resin, SJT372 carboxyl polyester resin, having a viscosity ranging from 1500 to 4500mpa.s at 200 c, and an acid value ranging from 66 to 75mgKOH/g.
Comparative example 2: the remaining technical solution of the comparative example 2 is the same as that of the example 1, except that in the comparative example 2, the formulation raw materials of the powder coating transparent base powder composition include 92wt% of polyester resin, TM5013, which is a polyester resin having a trade name of tiansong, zhejiang province, and has a viscosity range of 500-2000mpa.s at 200 ℃, and an acid value range of 75-85mgKOH/g.
Comparative example 3: the remaining technical solution of comparative example 3 is the same as example 1, except that in comparative example 3, the formulation of the powder coating transparent ground powder composition comprises 92wt% of polyester resin, crylcoat2671-3 with the brand ALLNEX, the viscosity range at 200 ℃ is 4300-7300mPa.s, and the acid value range is 45-51mgKOH/g.
Comparative example 4: the remaining technical solution of comparative example 4 is the same as example 1 except that, in comparative example 4, the formulation raw materials of the powder coating transparent base powder composition include 92wt% of polyester resin, SJ3B, having a trademark of shenjian, which has a viscosity range of 3500 to 5000mpa.s at 200 c and an acid value range of 68 to 75mgKOH/g.
Comparative example 5: the remaining technical solution of comparative example 5 is the same as example 1, except that in comparative example 5, 97wt% of the powder coating clear base powder composition and 3wt% of the leafing aluminum effect pigment are included;
in this comparative example 5, the formulation of the powder coating transparent base powder composition comprises 92% by weight of a polyester resin, SJT372 carboxyl polyester resin, having a viscosity at 200 ℃ in the range of 1500 to 4500mpa.s and an acid value in the range of 66 to 75mgKOH/g;6wt% TGIC;1wt% of a leveling agent; 0.5wt% of a degassing agent; 0.5wt% of curing accelerator, in particular to imidazole curing accelerator which is publicly sold in the market.
Comparative example 6: the remaining technical solution of comparative example 6 is the same as that of example 1, except that in comparative example 6, 98wt% of the powder coating transparent base powder composition is included, and 2wt% of pearlescent pigment (Shanghai Jingzhang NB bonding-free pearlescent powder, the average particle size of which is 15-30 μm).
Comparative example 7: this comparative example 7 used the imitation plating effect metal powder coating composition provided in example 1 of CN 112724802A.
The application is that the powder coating compositions are respectively prepared in the above examples 1-18 and comparative examples 1-7, and after spraying and curing (the curing conditions are uniformly selected to be 200 ℃ for 10 min) on aluminum base materials with the same type, curing coatings (namely the electroplating effect imitation single-coating coatings) are respectively obtained, wherein the film thickness of the curing coatings is 60-100 mu m; the present application performed the following comparison of performance tests shown in table 1 for each of the above cured coatings:
table 1 comparative table of performance tests of examples and comparative examples of the present application
The application also detects the cured coating obtained by adopting the existing commercial imitation plating liquid paint product according to the same standard, and the detection result is as follows: the DOI value of the cured coating is about 90, and the PCI leveling grade is 10; therefore, it can be confirmed that the embodiments provided by the present application can provide a coating with excellent imitation plating effect, which approaches the imitation plating effect level of the existing imitation plating liquid paint product, and thus is suitable for being used as an environment-friendly substitute product of the existing imitation plating liquid paint; to further increase the imitation plating level, the weight proportion of polyester resin in the powder coating clearcoat composition should be greater than 70 wt.%, and it is desirable not to add too much filler to the powder coating clearcoat composition.
Please refer to fig. 1, which is a photograph of a coating with an imitation electroplating effect corresponding to embodiment 1.
In order to further improve the chemical resistance and surface resistance of the cured coating, the application further provides a transparent finishing coating (specifically, tiger-
04900285 Obtaining a coating with an imitation electroplating effect; then, chemical resistance tests are further performed on the corresponding plating effect simulating coatings, and the test results are shown in the following table 2:
TABLE 2 chemical resistance test
It should be noted that the performance tests related to the present example or comparative example were performed according to the test standards or conditions described in the following table 3.
TABLE 3 test items and test standards or conditions
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 specification describes embodiments, not every embodiment includes only a single technical solution, and such description of the specification is for clarity reasons only, and those skilled in the art should make the specification as a whole, and technical solutions in various embodiments and features that are independent of each other may also be combined as appropriate to form other embodiments that can be understood by those skilled in the art.
Claims (10)
1. The imitation electroplating effect metal powder coating composition is characterized by comprising a powder coating transparent base powder composition and a floating type aluminum effect pigment which are mixed into a whole, wherein the raw materials of the powder coating transparent base powder composition comprise polyester resin and a curing agent for curing the polyester resin, the viscosity of the polyester resin at 200 ℃ is in a range of 1500-2500mPa.s, and the acid value of the polyester resin is not higher than 45mgKOH/g.
2. The imitation plating-effect metal powder coating composition according to claim 1, wherein the polyester resin has a viscosity at 200 ℃ in the range of 1500 to 2300mpa.s and an acid value in the range of 25 to 40mgKOH/g.
3. The imitation plating effect metal powder coating composition according to claim 1, wherein the polyester resin accounts for not less than 70wt% of the powder coating transparent base powder composition.
4. The imitation plating effect metal powder coating composition according to claim 1, wherein the curing agent is in a weight ratio of 2-15wt% of the polyester resin.
5. The imitation electroplating effect metal powder coating composition of claim 1, 2, 3 or 4, wherein the curing agent comprises TGIC.
6. The imitation galvanic metallic powder coating composition according to claim 1, wherein the leafing aluminum effect pigment is present in a weight ratio ranging from 0.2 to 2wt% of the powder coating transparent base powder composition.
7. The imitation galvanic effect metal powder coating composition of claim 1, wherein the leafing aluminum effect pigment has an average particle size in the range of no more than 10 microns.
8. The imitation galvanic effect metal powder coating composition of claim 1, wherein the leafing aluminum effect pigment is integrated with the powder coating clear primer by thermal bonding.
9. The electroplating effect imitating coating is characterized by being obtained by spraying and curing the electroplating effect imitating metal powder coating composition according to any one of claims 1 to 8 on a substrate, wherein the electroplating effect imitating coating has a DOI value not lower than 70 according to ASTM D5767-2017.
10. A plating-effect-simulated coating, which is characterized by comprising a plating-effect-simulated single-coating layer obtained by spraying and curing the plating-effect-simulated metal powder coating composition according to any one of claims 1 to 8 on a substrate and a transparent finishing coating layer positioned on the outer surface of the plating-effect-simulated single-coating layer.
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| CN109370371A (en) * | 2018-09-13 | 2019-02-22 | 福建万安实业集团有限公司 | A kind of high brightness imitates the powdery paints of electroplating effect |
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| CN114316752A (en) * | 2021-12-23 | 2022-04-12 | 老虎表面技术新材料（清远）有限公司 | Powder coating composition with stable pearl feel, preparation method thereof and coating |
| CN114410195A (en) * | 2021-12-24 | 2022-04-29 | 老虎表面技术新材料（苏州）有限公司 | High-gloss and high-leveling powder coating composition with brilliant color effect and coating thereof |
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- 2022-12-20 CN CN202211648691.7A patent/CN115895406A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109370371A (en) * | 2018-09-13 | 2019-02-22 | 福建万安实业集团有限公司 | A kind of high brightness imitates the powdery paints of electroplating effect |
| CN109401566A (en) * | 2018-09-28 | 2019-03-01 | 上海国丽粉体涂料有限公司 | The imitative plating powdery paints of one kind, preparation method and imitative electroplated coating |
| CN112724802A (en) * | 2020-12-29 | 2021-04-30 | 老虎表面技术新材料（苏州）有限公司 | Metal powder coating composition with electroplating-like effect and coating thereof |
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