CN116716025A - Powder coating composition, curing method and coating thereof - Google Patents
Powder coating composition, curing method and coating thereof Download PDFInfo
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- CN116716025A CN116716025A CN202310878804.0A CN202310878804A CN116716025A CN 116716025 A CN116716025 A CN 116716025A CN 202310878804 A CN202310878804 A CN 202310878804A CN 116716025 A CN116716025 A CN 116716025A
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- 239000000843 powder Substances 0.000 title claims abstract description 148
- 238000000576 coating method Methods 0.000 title claims abstract description 88
- 239000011248 coating agent Substances 0.000 title claims abstract description 86
- 239000008199 coating composition Substances 0.000 title claims abstract description 41
- 238000001723 curing Methods 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 67
- 230000000694 effects Effects 0.000 claims abstract description 38
- 238000013035 low temperature curing Methods 0.000 claims abstract description 33
- 229920001225 polyester resin Polymers 0.000 claims abstract description 33
- 239000004645 polyester resin Substances 0.000 claims abstract description 33
- 239000003822 epoxy resin Substances 0.000 claims abstract description 26
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 26
- 239000000049 pigment Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 12
- 239000004593 Epoxy Substances 0.000 claims abstract description 11
- 229920002301 cellulose acetate Polymers 0.000 claims abstract description 8
- 239000000758 substrate Substances 0.000 claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 6
- 230000009477 glass transition Effects 0.000 claims description 6
- KCFOLUKWAIAKFB-UHFFFAOYSA-N CCC(C=CC=C1)=C1P(C1=CC=CC=C1)C1=CC=CC=C1.Br Chemical compound CCC(C=CC=C1)=C1P(C1=CC=CC=C1)C1=CC=CC=C1.Br KCFOLUKWAIAKFB-UHFFFAOYSA-N 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 19
- 238000009472 formulation Methods 0.000 description 14
- 239000002994 raw material Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000113 differential scanning calorimetry Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 235000008577 Pinus radiata Nutrition 0.000 description 1
- 241000218621 Pinus radiata Species 0.000 description 1
- 235000005318 Serenoa repens Nutrition 0.000 description 1
- 240000006661 Serenoa repens Species 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
- B05D7/08—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood using synthetic lacquers or varnishes
-
- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D5/035—Coloring agents, e.g. pigments
-
- 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
- C09D5/28—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for wrinkle, crackle, orange-peel, or similar decorative effects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2203/00—Other substrates
- B05D2203/20—Wood or similar material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2508/00—Polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The application discloses a powder coating composition, a curing method and a coating thereof, comprising a texture type low-temperature curing powder coating base powder composition and an effect pigment; wherein the effect pigment is mixed with the texture type low-temperature curing powder coating base powder composition through a thermal bonding process; the texture type low-temperature curing powder coating base powder composition comprises polyester resin with an acid value not lower than 60mgKOH/g, epoxy resin with an epoxy equivalent not lower than 450g/eq and a texture agent, wherein the texture agent comprises cellulose acetate; the viscosity of the polyester resin at 200 ℃ is not higher than 2500 Pa.s, and the viscosity of the epoxy resin at 150 ℃ is not higher than 4500 Pa.s; the application can obtain the cured coating with special texture effect (similar to the hammer effect coating in the prior art), and the cured coating has excellent scratch resistance, thereby meeting the requirements of customization and diversification of low-temperature curing application scenes.
Description
Technical Field
The application belongs to the field of powder coating, and particularly relates to a powder coating composition, a curing method of the powder coating composition and a coating applied by the 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 that the thermosetting powder coating is widely used for replacing paint and water paint to realize the protection and decoration of products in various fields.
In order to meet the diversified decorative effect requirements, a textured powder coating product is proposed, the textured powder coating product in the prior art is generally applied to a metal substrate, needs to achieve crosslinking curing under the temperature condition of at least not lower than 180 ℃, cannot be applied to an application scene (such as a thermosensitive substrate) with the requirement of low-temperature curing (the curing condition of which is generally not higher than 160 ℃ and preferably not higher than 140 ℃), and further cannot be applied to the existing textured powder coating product to obtain a textured effect cured coating, and obviously cannot meet the requirements of customization and diversification in the market.
Accordingly, the present inventors have desired to develop this to solve the above-described technical problems.
Disclosure of Invention
Accordingly, the present application is directed to a powder coating composition, a curing method and a coating thereof, which can obtain a cured coating with a special texture effect (similar to the hammer effect coating in the prior art), and the cured coating has excellent scratch resistance, thereby meeting the requirements of customization and diversification of low-temperature curing application scenes.
The technical scheme adopted by the application is as follows:
a powder coating composition comprising a textured low temperature cure powder coating base powder composition and an effect pigment; wherein,,
the effect pigment is mixed with the texture type low-temperature curing powder coating base powder composition through a thermal bonding process;
the texture type low-temperature curing powder coating base powder composition comprises polyester resin with an acid value not lower than 60mgKOH/g, epoxy resin with an epoxy equivalent not lower than 450g/eq and a texture agent;
the viscosity of the polyester resin at 200 ℃ is not higher than 2500mpa.s, and the viscosity of the epoxy resin at 150 ℃ is not higher than 4500mpa.s;
the texturing agent comprises cellulose acetate.
Preferably, the texturing agent accounts for 0.01-0.2wt% of the texture type low-temperature curing powder coating base powder composition.
Preferably, the texturing agent is cellulose acetate.
Preferably, the polyester resin has an acid value in the range of 70 to 90mgKOH/g; and/or the polyester resin has a viscosity in the range of 200 to 2200mpa.s at 200 ℃; and/or the softening point temperature of the polyester resin is not higher than 120 ℃; and/or the glass transition temperature of the polyester resin is not higher than 58 ℃.
Preferably, the epoxy resin has an epoxy equivalent weight in the range of 500-650g/eq; and/or the softening point temperature of the epoxy resin is not higher than 110 ℃; and/or the epoxy resin has a viscosity in the range of 1000 to 4200mpa.s at 150 ℃.
Preferably, the weight part ratio of the polyester resin to the epoxy resin is 1:4-4:1.
Preferably, the texture type low temperature curing powder coating base powder composition further comprises a catalyst, preferably ethyl triphenylphosphine bromide, accounting for not less than 0.1wt% of the composition.
Preferably, the effect pigment comprises 0.5-5wt% of the texture type low temperature curing powder coating base powder composition; and/or the effect pigment comprises pearlescent pigment and/or aluminum powder and/or mica powder, preferably aluminum powder.
Preferably, a method of curing a powder coating composition as described above, wherein the powder coating composition is cured by infrared heating at a temperature of no more than 150 ℃ and for a time of no more than 5 minutes.
Preferably, the heating temperature ranges from 130 to 140 ℃ and/or the heating time ranges from 2 to 4 minutes;
a coating layer obtained by spraying the powder coating composition as described above onto a substrate and shaping by the curing method as described above.
Preferably, the substrate is a wood substrate.
The acid value detection standard according to the application is ISO 3682-1998; the viscosity number measurement standard is ASTM D4287-1994, and the measurement equipment used can be a standard commercial CONE-PLATE VISCOMETER (for example, ICI CONE-PLATE VISCOMETER (CONE & PLATE) with the name CAP 2000 VISCOMER from Brookfield); the detection criteria according to which the epoxy equivalent is concerned are: GB/T4612-2008; the detection criteria according to which the softening point is concerned are: GB/T4507-1999: the related glass transition temperature data are detected by a METLER thermal analyzer with the model of DSC Q20, and the detection method adopts a differential scanning thermal method DSC (the English name is Differential Scanning Calorimetry), and the heating rate parameter is set at 20 ℃/min.
The heating temperature according to the present application is a temperature set to heat a substrate coated with a powder coating composition.
The application firstly designs a formula scheme of a specific texture type low-temperature curing powder coating base powder composition at least comprising polyester resin with an acid value not lower than 60mgKOH/g and a viscosity not higher than 2500mPa.s at 200 ℃, epoxy resin with an epoxy equivalent not lower than 450g/eq and a viscosity not higher than 4500mPa.s at 150 ℃ and a texture agent.
Drawings
Fig. 1 is a photograph of a coating material according to example 1.
Detailed Description
The embodiment of the application provides a powder coating composition, which comprises a texture type low-temperature curing powder coating base powder composition and an effect pigment; wherein the effect pigment is mixed with the texture type low-temperature curing powder coating base powder composition through a thermal bonding process; in this embodiment, any known thermal bonding (bonding) process may be used in the thermal bonding process, and the present embodiment is not particularly limited; preferably, in the thermal bonding process, the thermal bonding temperature is recommended to be set at 50-55 ℃, and the thermal bonding time is recommended to be 2-5 minutes.
Preferably, in this embodiment, the textured low temperature cure powder coating base powder composition comprises at least the following materials:
a polyester resin having an acid value of not less than 60mgKOH/g and a viscosity of not more than 2500mPa.s at 200 ℃; in order to further facilitate the low-temperature curing effect while not affecting the intended target texture effect, it is preferable that the acid value of the polyester resin in the present embodiment is in the range of 70 to 90mgKOH/g, more preferably 75 to 85mgKOH/g; and/or preferably, in the present embodiment, the polyester resin has a viscosity in the range of 200 to 2200mpa.s, more preferably 500 to 2000mpa.s, at 200 ℃; and/or preferably, in the present embodiment, the softening point temperature of the polyester resin is not higher than 120 ℃, preferably 90 to 110 ℃; and/or preferably, in the present embodiment, the glass transition temperature of the polyester resin is not higher than 58 ℃, and more preferably, the glass transition temperature is 45 to 55 ℃; particularly preferably, the polyester resin may be Polyester Resin TM5013 from Pinus radiata, which is transmitted in Zhejiang, and has an acid value ranging from 75 to 85mgKOH/g, a viscosity ranging from 500 to 2000mPa.s at 200 ℃, a softening point ranging from 90 to 110 ℃, and a glass transition temperature ranging from 51.+ -. 3 ℃, although a polyester resin having a similar parameter range may be used as a preferred example of the polyester resin used in the present application;
an epoxy resin having an epoxy equivalent of not less than 450g/eq and a viscosity of not more than 4500mpa.s at 150 ℃; in order to further facilitate the low-temperature curing effect while not affecting the intended target texture effect, it is preferable that the epoxy equivalent weight of the epoxy resin in the present embodiment is in the range of 500 to 650g/eq, more preferably 500 to 600g/eq, still more preferably 500 to 560g/eq; and/or preferably, in this embodiment, the softening point temperature of the epoxy resin is not higher than 110 ℃, more preferably 80-100 ℃; and/or preferably, in this embodiment, the epoxy resin has a viscosity in the range of 1000 to 4200mpa.s, more preferably 2000 to 4200mpa.s, at 150 ℃; particularly preferably, the epoxy resin may be EPOTEC YD 942from EPOTEC having an epoxy equivalent weight in the range of 500-560g/eq, a softening point temperature in the range of 80-95 ℃ and a viscosity in the range of 1500-4000mpa.s at 150 ℃, although epoxy resins having similar parameter ranges may also be used as preferred embodiments of the epoxy resins employed in the present application;
the texturing agent can be a proper texturing agent according to actual needs; preferably, in order to facilitate the desired hammer coating effect, in the present embodiment, the texturing agent includes cellulose acetate, and particularly preferably, in the present embodiment, cellulose acetate is used as the texturing agent; the present inventors have tried other conventional texturing agents and found that a specific hammer coating effect could not be achieved.
Preferably, in the present embodiment, the weight part ratio of the polyester resin to the epoxy resin is 1:4 to 4:1, more preferably 1:2.5 to 2.5:1, still more preferably 1:1.5 to 1.5:1; preferably, in the present embodiment, the sum of the parts by weight of the polyester resin and the epoxy resin is 50 to 95wt%, more preferably 60 to 85wt%, still more preferably 65 to 80wt% of the weight of the texture-type low-temperature-curable powder coating base powder composition;
preferably, in the present embodiment, the texturing agent is 0.01 to 0.2wt%, more preferably 0.02 to 0.1wt%, still more preferably 0.03 to 0.08wt% based on the weight of the textured low-temperature-curable powder coating base composition; it is particularly preferred that the cellulose acetate is not less than 0.02wt% nor more than 0.4wt% of the textured low temperature curable powder coating base composition, which would otherwise significantly affect the desired hammer coating effect.
Preferably, in order to promote the crosslinking curing reaction between the polyester resin and the epoxy resin, in the present embodiment, the texture-type low-temperature-curable powder coating base composition further comprises a catalyst in an amount of not less than 0.1% by weight, more preferably comprises a catalyst in an amount of 0.2 to 1% by weight, still more preferably 0.3 to 0.8% by weight, based on the weight of the composition; the catalyst is preferably ethyl triphenylphosphine bromide, although a catalyst with similar catalytic effect can be used, and the embodiment is not limited only.
Preferably, in this embodiment, the effect pigment comprises 0.5 to 5wt%, more preferably 0.5 to 3wt%, still more preferably 0.8 to 2wt% of the textured low temperature curable powder coating base powder composition; and/or preferably, in the present embodiment, the effect pigment includes pearlescent pigment and/or aluminum powder and/or mica powder, more preferably, in order to facilitate obtaining the desired hammer effect, in the present embodiment, the effect pigment includes aluminum powder, still more preferably, floating aluminum powder is used as the effect pigment, and the target hammer effect obtained is more stable and reliable.
All the raw materials related to the application can be directly purchased in the market, and the raw material sources are easy to obtain.
In the specific implementation of the application, the well-known leveling agent, degassing agent, antioxidant, dispersing agent, filler, pigment, stabilizer, curing accelerator, functional auxiliary agent or other auxiliary agents and the like can be added into the texture type low-temperature curing powder coating base powder composition, and the materials are all selected by the routine technology of the person skilled in the art; wherein the addition proportion of the filler and/or pigment is selected conventionally according to the actual need, preferably 0-40wt%, more preferably 1-40wt% of the texture type low temperature curing powder coating base powder composition, and the filler and/or pigment is selected from carbon black, aluminum hydroxide, barium sulfate, tiO 2 Etc.
The texture-type low-temperature-curable powder coating base composition of the present application may be prepared by any known preparation process, and is preferably prepared by mixing, melt-extruding, crushing and other known processes, but the texture-type low-temperature-curable powder coating base composition of the present application may be prepared by other known preparation processes.
In order to facilitate the low-temperature curing effect of the powder coating composition, preferably, the present embodiment also proposes a curing method of the powder coating composition as described above, wherein the powder coating composition is cured by infrared heating at a temperature of not higher than 150 ℃ for a time of not more than 5 minutes; preferably, in this embodiment, the heating temperature is in the range of 130-140 ℃, and/or the heating time is in the range of 2-4 minutes.
The embodiment also provides a coating, wherein the powder coating composition is sprayed on a substrate, and the coating is obtained by forming through the curing method; preferably, in the present embodiment, the substrate is a wood substrate, and in other embodiments, the substrate may be other substrates having low-temperature curing requirements; of course, the powder coating composition and the curing method thereof provided in this example may also be applied to a conventional metal substrate, and this example is not limited only.
In this embodiment, the substrate may be pretreated and/or pre-sprayed; the thickness of the coating in this embodiment may be specifically selected according to practical needs, and the recommended thickness range of the coating is 60-120 μm (the test standard is ISO 2360-2017).
In order to verify the technical effect of the application in practice, the application makes specific test performance comparisons with the following groups of examples as raw materials for the formulation of the powder coating composition:
example 1: a POWDER coating composition comprising 98wt% of a textured low temperature cured POWDER coating base POWDER composition and 2wt% of ALUMINUM POWDER (trade name from alusum POWDER 2091 supplied by Benda-lutz, having an average particle size of 5 microns), the ALUMINUM POWDER being mixed with the textured low temperature cured POWDER coating base POWDER composition by a thermal bonding process, wherein the thermal bonding temperature ranges from 50 to 55 ℃ and the thermal bonding time ranges from 2 to 4 minutes in the thermal bonding process.
In this example 1, a textured low temperature cure powder coating base composition was prepared as shown in table 1 below:
TABLE 1 formulation table of texture Low temperature curable powder coating base powder composition in this example 1
Example 2: the other technical scheme of this example 2 is the same as that of example 1, except that in this example 2, the formulation raw materials of the texture type low temperature curing powder coating base powder composition were prepared as shown in the following table 2:
TABLE 2 formulation table of texture Low temperature curing powder coating base powder composition in this example 2
Example 3: the other technical scheme of this example 3 is the same as that of example 1, except that in this example 3, the formulation raw materials of the texture type low temperature curing powder coating base powder composition were prepared as shown in the following table 3:
TABLE 3 formulation table of texture Low temperature curable powder coating base powder composition in this example 3
Example 4: the other 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 texture type low temperature curable powder coating base powder composition were prepared as shown in the following table 4:
TABLE 4 formulation table of texture Low temperature curing powder coating base powder composition in this example 4
Example 5: the other technical scheme of this example 5 is the same as that of example 1, except that in this example 5, the formulation raw materials of the texture type low temperature curable powder coating base powder composition were prepared as shown in the following table 5:
TABLE 5 formulation table of texture Low temperature curable powder coating base powder composition in this example 5
Example 6: the other 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 texture type low temperature curable powder coating base powder composition were prepared as shown in the following table 6:
TABLE 6 formulation table of texture Low temperature curable powder coating base powder composition in this example 6
Example 7: the other technical scheme of this example 7 is the same as that of example 1, except that in this example 7, the formulation raw materials of the texture type low temperature curable powder coating base powder composition were prepared as shown in the following table 7:
TABLE 7 formulation table of texture Low temperature curable powder coating base powder composition in this example 7
Example 8: the remaining technical solution of this example 8 is the same as that of example 1, except that in this example 8, the powder coating composition includes 97wt% of the texture low-temperature-curable powder coating base powder composition and 3wt% of the aluminum powder.
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 powder coating composition includes 99wt% of the texture low-temperature-curable powder coating base powder composition and 1wt% of the aluminum powder.
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 powder coating composition includes 99.5wt% of the texture low-temperature-curable powder coating base powder composition and 0.5wt% of the aluminum powder.
Example 11: the remaining solution of this example 11 is the same as that of example 1, except that in this example 11, the powder coating composition comprises 98wt% of the texture low-temperature-curable powder coating base powder composition and 2wt% of the pearlescent pigment (Shanghai Jinsha NB bonding-free pearlescent powder).
Comparative example 1: the remaining technical solutions of this comparative example 1 are identical to example 1, except that: in this comparative example 1, the Polyester Resin TM5013 polyester resin in example 1 was replaced with one from allnex4642-3, which has a viscosity at 200℃in the range of 1500-2300mPa.s and an acid value in the range of 32-38mgKOH/g.
Comparative example 2: the remaining technical solutions of this comparative example 2 are identical to example 1, except that: in this comparative example 2, the Polyester Resin TM5013 polyester resin in example 1 was replaced with SJ3B from sabal, which had a viscosity at 200 ℃ in the range of 3500 to 5000mpa.s and an acid value in the range of 68 to 75mgKOH/g.
Comparative example 3: the remaining technical solutions of this comparative example 3 are identical to example 1, only with the difference that: in this comparative example 3, the EPOTEC YD 942from EPOTEC epoxy resin in example 1 was replaced with GMA1618 from the Ningbo south sea chemistry having an epoxy equivalent of 400-430g/eq and a softening point temperature of 92-97 ℃.
Comparative example 4: the remaining technical solutions of this comparative example 4 are identical to example 1, only with the difference that: in this comparative example 4, a powder coating composition is provided in which an effect pigment is mixed with a textured low temperature cure powder coating base powder composition by a dry blending process.
Comparative example 5: the remaining technical solutions of this comparative example 5 are identical to example 1, only with the difference that: in this comparative example 5, the texture type low temperature curing powder coating base powder composition in example 1 was directly used as the powder coating composition.
The application according to the raw material formulas of the above examples 1-11 and comparative examples 1-5 respectively obtain the corresponding base powder compositions through the same procedures (known process preparation technology) of weighing, premixing, melt extrusion, grinding, cyclone separation and the like.
The powder coating compositions prepared in examples 1 to 11 and comparative examples 1 to 5 were used, respectively, and MDF of the same specification was selected as a substrate, and each powder coating composition was cured by infrared heating at 130℃for 3 minutes to obtain coatings (see FIG. 1 for photographs of the coatings obtained in example 1), and the results of the performance test and comparison were shown in Table 8 below:
table 8 performance test comparisons for various groups of examples and comparative examples
After comparative testing, the powder coating compositions provided in examples 1-11 have good substrate adhesion to the MDF substrate surface; meanwhile, the rapid solidification under the low-temperature condition is realized, the basic performance of the powder coating for coating protection is met, the problems of serious shrinkage cavity of a coating film, deformation and cracking of the plate caused by rapid evaporation of the moisture of the MDF plate are effectively avoided, and more importantly, the expected target hammer coating effect is obtained; further, in examples 1 to 11 of the present application, examples 1 to 10 have more remarkably excellent hammer coat performance, indicating that it is more advantageous to achieve the target hammer effect when aluminum powder is used as the effect pigment.
It should be noted that the coating performance test of this example was performed according to the test criteria set forth in table 9 below.
Table 9 test items and test criteria
| Test item | Execution test criteria |
| Appearance of the coating | By visual observation |
| Hardness of pencil | GBT6739-1996 |
| Dividing lattice | ISO 2409-2013 |
| Impact | ISO 6272-1-2011、2-2011 |
| Bending | ISO 1519-2011 |
| Cup-shaped protrusion | ISO 1520-2006 |
| MEK test | GB/T 23989-2009 |
| Dry heat | BS EN 12722-2009 |
| Damp-heat type | BS EN 12721-2009 |
It should be noted that, the person skilled in the art can apply the powder coating composition according to the present application to the coating protection of other material substrates, and can obtain similar coating effects, and the present application will not be described in detail.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (12)
1. A powder coating composition comprising a textured low temperature cure powder coating base powder composition and an effect pigment; wherein,,
the effect pigment is mixed with the texture type low-temperature curing powder coating base powder composition through a thermal bonding process;
the texture type low-temperature curing powder coating base powder composition comprises polyester resin with an acid value not lower than 60mgKOH/g, epoxy resin with an epoxy equivalent not lower than 450g/eq and a texture agent;
the viscosity of the polyester resin at 200 ℃ is not higher than 2500mpa.s, and the viscosity of the epoxy resin at 150 ℃ is not higher than 4500mpa.s;
the texturing agent comprises cellulose acetate.
2. The powder coating composition of claim 1, wherein the texturing agent comprises 0.01 to 0.2wt% of the textured low temperature cured powder coating base powder composition.
3. The powder coating composition of claim 1, wherein the texturing agent is cellulose acetate.
4. A powder coating composition as recited in claim 1, wherein the polyester resin has an acid value in the range of 70-90mgKOH/g; and/or the polyester resin has a viscosity in the range of 200 to 2200mpa.s at 200 ℃; and/or the softening point temperature of the polyester resin is not higher than 120 ℃; and/or the glass transition temperature of the polyester resin is not higher than 58 ℃.
5. The powder coating composition of claim 1, wherein the epoxy resin has an epoxy equivalent weight in the range of 500-650g/eq; and/or the softening point temperature of the epoxy resin is not higher than 110 ℃; and/or the epoxy resin has a viscosity in the range of 1000 to 4200mpa.s at 150 ℃.
6. The powder coating composition of claim 1, wherein the weight ratio of the polyester resin to the epoxy resin is 1:4 to 4:1.
7. A powder coating composition as recited in claim 1, wherein the textured low temperature cure powder coating base powder composition further comprises a catalyst, preferably ethyl triphenylphosphine bromide, in a proportion of not less than 0.1wt% based on parts by weight.
8. The powder coating composition of claim 1, wherein the effect pigment comprises 0.5 to 5wt% of the textured low temperature cured powder coating base powder composition; and/or the effect pigment comprises pearlescent pigment and/or aluminum powder and/or mica powder, preferably aluminum powder.
9. A method of curing a powder coating composition as recited in any one of claims 1 to 8, wherein the powder coating composition is cured by infrared heating at a temperature of no more than 150 ℃ and for a time of no more than 5 minutes.
10. The curing process according to claim 9, wherein the heating temperature is in the range of 130-140 ℃ and/or the heating time is in the range of 2-4 minutes.
11. A coating, characterized in that it is obtained by spraying a powder coating composition according to any one of claims 1 to 8 onto a substrate and shaping it by a curing process according to claim 9 or 10.
12. The coating of claim 11, wherein the substrate is a wood substrate.
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