CN111978831A - High-brightness powder coating and preparation method thereof - Google Patents
High-brightness powder coating and preparation method thereof Download PDFInfo
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- CN111978831A CN111978831A CN202010933377.8A CN202010933377A CN111978831A CN 111978831 A CN111978831 A CN 111978831A CN 202010933377 A CN202010933377 A CN 202010933377A CN 111978831 A CN111978831 A CN 111978831A
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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
- C09D5/033—Powdery paints characterised by the additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a high-brightness powder coating and a preparation method thereof, wherein the high-brightness powder coating comprises the following raw materials in parts by weight: 40-55 parts of polyester resin, 15-25 parts of organic silicon resin, 6-15 parts of methyl phenol type phenolic resin, 3-7 parts of curing agent, 1-1.8 parts of flatting agent, 0.5-1.2 parts of defoaming agent and 0.4-0.8 part of benzoin. The powder coating is applied to a plate to form a coating, the coating has high brightness, the performances of the coating in the aspects of adhesive force, impact resistance and hardness are greatly improved, and the comprehensive performance is excellent.
Description
Technical Field
The invention relates to the technical field of powder coatings, in particular to a high-brightness powder coating and a preparation method thereof.
Background
Powder coatings represent a rapidly growing area in the overall coating technology. Because the VOC emission is almost zero, the rapid development of the VOC is driven by the environmental protection requirement. The requirements of global and Chinese environmental protection laws and regulations are more and more strict, and the development of the environmental protection powder coating industry is effectively promoted.
After the existing powder coating is applied to a plate and cured to form a coating, the brightness of the coating is generally not high, the coating is generally in a matte or ordinary state, most coatings are in a matte state, and the existing powder coating is difficult to meet the requirements on occasions needing high light.
Disclosure of Invention
In view of the above, the invention provides a high-brightness powder coating and a preparation method thereof.
A high-brightness powder coating comprises the following raw materials in parts by weight:
preferably, the raw materials comprise the following components in parts by weight:
preferably, the curing agent is one of β -hydroxyalkylamide, dicyandiamide, a phenolic resin, and triglycidyl isocyanurate.
Preferably, the dicyandiamide is micronized dicyandiamide, and the particle size D98 of the micronized dicyandiamide is less than or equal to 30 microns.
Preferably, the leveling agent is one of polydimethylsiloxane, polyether polyester modified organic siloxane and alkyl modified organic siloxane.
Preferably, the defoaming agent is one of silicone emulsion, higher alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane.
Preferably, the defoaming agent is silicone emulsion.
A method for preparing high-brightness powder coating comprises the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing at the temperature of 40-50 ℃ and the rotating speed of 250-450r/min for 5-10min to obtain a mixed material;
extruding: adding the mixed material into a double-screw extruder, wherein the temperature of a machine cavity is 90-105 ℃, the temperature of a machine head is 100-;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: adding the pressed tablets into a crusher, crushing for 15-30s for one time, crushing for 3-5 times, and sieving with a 200-mesh and 300-mesh sieve to obtain the powder coating.
Preferably, the method is as follows:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing at the temperature of 42-48 ℃ and the rotating speed of 280-420r/min for 7-9min to obtain a mixed material;
extruding: adding the mixed material into a double-screw extruder, wherein the temperature of a machine cavity is 95-102 ℃, the temperature of a machine head is 102-;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: adding the pressed tablets into a crusher, crushing for 18-25s for one time, crushing for 4-5 times, and sieving with a 280-mesh sieve of 220-.
The invention provides a high-brightness powder coating and a preparation method thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
A high-brightness powder coating comprises the following raw materials in parts by weight:
wherein the curing agent is one of beta-hydroxyalkylamide, dicyandiamide, phenolic resin and triglycidyl isocyanurate; the dicyandiamide is micronized dicyandiamide, and the particle size D98 of the micronized dicyandiamide is less than or equal to 30 microns; the flatting agent is one of polydimethylsiloxane, polyether polyester modified organic siloxane and alkyl modified organic siloxane; the defoaming agent is one of emulsified silicone oil, high alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane; the defoaming agent is emulsified silicone oil.
A method for preparing high-brightness powder coating comprises the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing at the temperature of 40-50 ℃ and the rotating speed of 250-450r/min for 5-10min to obtain a mixed material;
extruding: adding the mixed material into a double-screw extruder, wherein the temperature of a machine cavity is 90-105 ℃, the temperature of a machine head is 100-;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: adding the pressed tablets into a crusher, crushing for 15-30s for one time, crushing for 3-5 times, and sieving with a 200-mesh and 300-mesh sieve to obtain the powder coating.
Example 1
A high-brightness powder coating comprises the following raw materials in parts by weight:
wherein the curing agent is beta-hydroxyalkylamide; the flatting agent is polydimethylsiloxane; the brightener is acrylate copolymer; the defoaming agent is emulsified silicone oil.
A method for preparing high-brightness powder coating comprises the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing for 5min at the temperature of 40 ℃ and the rotating speed of 450r/min to obtain a mixed material;
extruding: adding the mixed materials into a double-screw extruder, wherein the temperature of a machine cavity is 90 ℃, the temperature of a machine head is 100 ℃, the rotating speed of screws is 200r/min, and performing melt extrusion to obtain an extruded material;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: and (3) adding the pressed sheets into a grinder, grinding for 30s for one time for 3 times, and sieving with a 300-mesh sieve to obtain the powder coating.
Example 2
A high-brightness powder coating comprises the following raw materials in parts by weight:
wherein the curing agent is phenolic resin; the flatting agent is alkyl modified organic siloxane; the brightener is methyl methacrylate homopolymer; the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether.
A method for preparing high-brightness powder coating comprises the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing for 7min at 42 ℃ and the rotating speed of 420r/min to obtain a mixed material;
extruding: adding the mixed materials into a double-screw extruder, wherein the temperature of a machine cavity is 102 ℃, the temperature of a machine head is 108 ℃, the rotating speed of screws is 160r/min, and performing melt extrusion to obtain an extrudate;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: and (3) adding the pressed tablets into a grinder, grinding for 18s for one time for 5 times, and sieving with a 220-mesh sieve to obtain the powder coating.
Example 3
A high-brightness powder coating comprises the following raw materials in parts by weight:
wherein the curing agent is dicyandiamide, the dicyandiamide is micronized dicyandiamide, and the particle size D98 of the micronized dicyandiamide is not more than 30 mu m; the leveling agent is polyether polyester modified organic siloxane; the brightener is polyethylene wax; the defoaming agent is a higher alcohol fatty acid ester compound.
A method for preparing high-brightness powder coating comprises the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing at 50 ℃ and 250r/min for 10min to obtain a mixed material;
extruding: adding the mixed materials into a double-screw extruder, wherein the temperature of a machine cavity is 105 ℃, the temperature of a machine head is 110 ℃, the rotating speed of screws is 150r/min, and performing melt extrusion to obtain an extruded material;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: and (3) adding the pressed sheets into a grinder, grinding for 15s for one time for 5 times, and sieving with a 200-mesh sieve to obtain the powder coating.
Example 4
A high-brightness powder coating comprises the following raw materials in parts by weight:
wherein the curing agent is triglycidyl isocyanurate; the flatting agent is alkyl modified organic siloxane; the brightener is methyl methacrylate-n-butyl acrylate copolymer; the defoaming agent is polyoxyethylene polyoxypropylene ether.
A method for preparing high-brightness powder coating comprises the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing at 48 ℃ and 280r/min for 9min to obtain a mixed material;
extruding: adding the mixed materials into a double-screw extruder, wherein the temperature of a machine cavity is 95 ℃, the temperature of a machine head is 102 ℃, the rotating speed of screws is 190r/min, and performing melt extrusion to obtain an extruded material;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: and (3) adding the pressed tablets into a grinder, grinding for 25s for one time for 4 times, and sieving with a 280-mesh sieve to obtain the powder coating.
Example 5
A high-brightness powder coating comprises the following raw materials in parts by weight:
wherein the curing agent is dicyandiamide; the dicyandiamide is micronized dicyandiamide, and the particle size D98 of the micronized dicyandiamide is less than or equal to 25 mu m; the leveling agent is polyether polyester modified organic siloxane; the brightener is methyl methacrylate-isooctyl acrylate copolymer; the defoaming agent is polyoxypropylene glycerol ether.
A method for preparing high-brightness powder coating comprises the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, and mixing for 8min at the temperature of 45 ℃ and the rotating speed of 350r/min to obtain a mixed material;
extruding: adding the mixed materials into a double-screw extruder, wherein the temperature of a machine cavity is 98 ℃, the temperature of a machine head is 105 ℃, the rotating speed of screws is 180r/min, and performing melt extrusion to obtain an extruded material;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: and (3) adding the pressed sheets into a grinder, grinding for 20s for one time for 5 times, and sieving with a 250-mesh sieve to obtain the powder coating.
The powder coatings of specific examples 1-5 were applied to articles and tested for salt spray resistance, adhesion, impact strength and hardness with a commercially available salt spray resistant powder coating (comparative example 1) according to the following test methods: 60 ℃ gloss (GB/T9754-2007), adhesion (ISO2409-2007), impact strength (GB/T1732-93) and hardness properties (GB/T9754-2007), the test results are as follows:
as can be seen from the above table: comparing the powder coating of the specific examples 1-5 with the comparative example 1, the powder coating of the examples 1-5 has greatly improved 60 DEG gloss compared with the comparative example 1, and has greatly improved adhesion, impact resistance and hardness compared with the comparative example, and excellent comprehensive performance.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The present invention has been described in detail, and the principle and embodiments of the present invention are explained by applying specific examples, which are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Claims (9)
1. The high-brightness powder coating is characterized by comprising the following raw materials in parts by weight:
2. the powder coating of claim 1, wherein the raw materials comprise, by weight:
3. the powder coating according to any of claims 1-2, wherein the curing agent is one of β -hydroxyalkylamide, dicyandiamide, phenolic resin and triglycidyl isocyanurate.
4. The powder coating of claim 3, wherein the dicyandiamide is micronized dicyandiamide, the particle size D98 of which is 30 μm or less.
5. The powder coating according to any one of claims 1-2, wherein the leveling agent is one of polydimethylsiloxane, polyether polyester modified organosiloxane, and alkyl modified organosiloxane.
6. The powder coating according to any one of claims 1 to 2, wherein the defoaming agent is one of silicone emulsion, higher alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether, and polydimethylsiloxane.
7. The powder coating of claim 6, wherein the defoamer is a silicone emulsion.
8. A preparation method of high-brightness powder coating is characterized by comprising the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing at the temperature of 40-50 ℃ and the rotating speed of 250-450r/min for 5-10min to obtain a mixed material;
extruding: adding the mixed material into a double-screw extruder, wherein the temperature of a machine cavity is 90-105 ℃, the temperature of a machine head is 100-;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: adding the pressed tablets into a crusher, crushing for 15-30s for one time, crushing for 3-5 times, and sieving with a 200-mesh and 300-mesh sieve to obtain the powder coating.
9. The method for preparing the compound of claim 8, wherein the method comprises the following steps:
mixing: adding polyester resin, organic silicon resin, methyl phenol type phenolic resin, a curing agent, a flatting agent, a defoaming agent and benzoin into a mixer, mixing at the temperature of 42-48 ℃ and the rotating speed of 280-420r/min for 7-9min to obtain a mixed material;
extruding: adding the mixed material into a double-screw extruder, wherein the temperature of a machine cavity is 95-102 ℃, the temperature of a machine head is 102-;
tabletting: adding the extrudate into a tabletting machine for tabletting while the extrudate is hot, and naturally cooling after tabletting to obtain a tablet;
crushing: adding the pressed tablets into a crusher, crushing for 18-25s for one time, crushing for 4-5 times, and sieving with a 280-mesh sieve of 220-.
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Application publication date: 20201124 |