CN111635691A - Novel high-grade powder coating and preparation method thereof - Google Patents
Novel high-grade powder coating and preparation method thereof Download PDFInfo
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- CN111635691A CN111635691A CN202010498735.7A CN202010498735A CN111635691A CN 111635691 A CN111635691 A CN 111635691A CN 202010498735 A CN202010498735 A CN 202010498735A CN 111635691 A CN111635691 A CN 111635691A
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
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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
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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
- 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
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- 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
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- 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
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Abstract
The invention discloses a novel high-grade powder coating and a preparation method thereof, which solve the problems that the prior powder coating has poor impact strength and acid and alkali resistance, the lubricity of the powder coating cannot meet the use requirement, and the oxidative decomposition of organic resin is easily caused due to the problem of a preparation method in the production process of the powder coating, so that the quality of the powder coating is influenced. The adoption of double-screening fine crushing can ensure that the matrix resin particles are small and uniform, and can carry out thin coating, so that the coating effect is better.
Description
Technical Field
The invention relates to the technical field of powder coatings, in particular to a novel high-grade powder coating and a preparation method thereof.
Background
The powder coating rises as a novel coating with high performance, low pollution, less pollution and energy conservation, becomes one of main products for replacing the traditional solvent type coating, along with the acceleration of the modernization pace of our country and the rapid development of economy, particularly in recent years, the coating technical level and the quality requirement of our country are continuously improved, the powder coating replaces the paint and becomes the most ideal product for coating and preventing corrosion on the metal surface, particularly the high-grade metal surface, but the existing powder coating and the synthesis method in our country have the following problems: the existing powder coating has poor impact strength and acid and alkali resistance, the lubricity of the powder coating cannot meet the use requirement, and the problem of oxidative decomposition of organic resin is easily caused due to the problem of an extraction method in the production process of the powder coating, so that the quality of the powder coating is influenced.
Disclosure of Invention
The invention aims to provide a novel high-grade powder coating and a preparation method thereof, and aims to solve the problems that the conventional powder coating is poor in impact strength and acid and alkali resistance, the lubricity of the powder coating cannot meet the use requirement, and the quality of the powder coating is affected due to the fact that body resin is easily oxidized and decomposed due to the problem of the preparation method in the production process of the powder coating.
The invention is realized by the following steps:
a novel high-grade powder coating and a preparation method thereof, the raw materials of the powder coating comprise epoxy resin, weather-resistant resin, pigment, filler, aluminum silver powder, hardening assistant and other assistants, and the raw materials are prepared by the following weight percentage: 30-35% of E-12 epoxy resin, 30-35% of weather-resistant resin, 20-30% of a pigment and filler mixture, 1-3% of aluminum silver powder, 0.5-1.5% of a hardening assistant and 1-3% of other assistants.
Further, the weather-resistant resin is specifically polyester resin, and the acid value of the polyester resin is 70.7 mgKOH/g.
Furthermore, the hardening auxiliary agent is a polypropylene compound.
Further, the other auxiliary agent is one or two of a flatting agent and a brightener.
A preparation method of a novel high-grade powder coating comprises the following specific steps:
s1: raw material ratio
Respectively installing the raw materials in corresponding parts by weight for weighing, and placing the weighed raw materials beside a high-speed mixer for later use;
s2: premixing
Pouring the raw materials weighed according to the formula into a high-speed mixer for uniform and sufficient mixing, and then leading out the uniformly stirred raw materials from the interior of the high-speed mixer;
s3: melt extrusion
The premixed raw materials are poured into an extruder, the mixed raw materials are heated and melted in the extrusion process, and curing agents, flatting agents, pigments and fillers and the like are uniformly dispersed in resin under the action of high shearing force, generally speaking, the extrusion temperature is slightly higher than the softening point of the resin, so that the materials are melted into proper viscosity, high shearing force can be generated during extrusion, high dispersion of the pigments and the like is facilitated, and all components are formed into a uniform system;
s4: coarse grinding
During coarse crushing, an extruder is provided with a cooling belt and a crushing roller, and extruded materials are directly cooled and crushed, so that the extruded and cooled materials are crushed to the feeding granularity which can be accepted by fine crushing equipment;
s5: double-sieve crushing
The materials crushed after melt extrusion mixing are finely crushed by an air classification mill (commonly called ACM mill), then the ultrafine powder coating is separated and removed by a cyclone separator, and the coarse powder coating is removed by sieving equipment, so that a product suitable for electrostatic coating of the powder coating is obtained, and the particle size distribution of the powder coating required by electrostatic powder coating is achieved;
s6: bonding
Adding the crushed and screened powder coating into a high-speed mixer with a temperature control jacket, utilizing mechanical high-speed rotation, generating friction in a short time due to different movement speeds between a stirring paddle and a material to be mixed, increasing the temperature of a base material mixture through frictional heat generation, wherein the temperature value is slightly lower than the glass transition temperature of resin, rapidly adding a metal pigment into the powder rotating at high speed under the protection of nitrogen and mechanical high-speed stirring to enable the metal pigment to be bonded on the surface of softened powder coating particles, then rapidly discharging and cooling, and adding the metal pigment in the bonding process to enable the powder coating to have the color corresponding to metal;
s7: detection of
The powder coating after bonding is detected to ensure that the produced powder coating can meet the qualified requirements, and the influence on the use experience of consumers due to the fact that a large number of unqualified products flow into the market is avoided;
s8: packaging and warehousing
And packaging the qualified products, pasting the qualification certificate, and putting the packaged powder coating into a warehouse for sale.
Furthermore, the raw materials are melted and extruded by adopting a deep thread low-temperature extrusion method during melting extrusion, so that the oxidative decomposition of the matrix resin can be avoided.
Further, the sieving equipment is of a double-sieve structure.
Furthermore, metal pigments are required to be added in the bonding process, so that the powder coating has the color corresponding to that of the metal.
Compared with the prior art, the invention has the beneficial effects that: the powder coating has high impact strength, acid resistance, alkali resistance, salt mist resistance and weather resistance, and the coating surface is flat and smooth by improving and optimizing the matching of the powder coating and the synthesis method thereof, the curing time can be shortened, the purposes of energy saving, low carbon and environmental protection are realized, the service performance of the powder coating is improved, and the oxidative decomposition of matrix resin can be avoided by adopting a deep thread low-temperature extrusion method in the production process of the powder coating. The adoption of double-screening fine crushing can ensure that the matrix resin particles are small and uniform, and can carry out thin coating, so that the coating effect is better.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a process flow diagram of the synthetic method of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example (b): a novel high-grade powder coating and a preparation method thereof, the raw materials of the powder coating comprise epoxy resin, weather-resistant resin, pigment, filler, aluminum silver powder, hardening assistant and other assistants, and the raw materials are prepared by the following weight percentage: 30-35% of E-12 epoxy resin, 30-35% of weather-resistant resin, 20-30% of a pigment and filler mixture, 1-3% of aluminum silver powder, 0.5-1.5% of a hardening assistant and 1-3% of other assistants, wherein the weather-resistant resin is specifically polyester resin, the acid value of the polyester resin is 70.7mgKOH/g, the hardening assistant is a polypropylene compound, and the other assistants are one or two of a flatting agent and a gloss enhancer.
Referring to FIG. 1: a preparation method of a novel high-grade powder coating comprises the following specific steps:
s1: raw material ratio
Respectively installing the raw materials in corresponding parts by weight for weighing, and placing the weighed raw materials beside a high-speed mixer for later use;
s2: premixing
Pouring the raw materials weighed according to the formula into a high-speed mixer for uniform and sufficient mixing, and then leading out the uniformly stirred raw materials from the interior of the high-speed mixer;
s3: melt extrusion
The premixed raw materials are poured into an extruder, and the raw materials are melted and extruded by adopting a deep thread low-temperature extrusion method, so that the oxidative decomposition of matrix resin can be avoided, the mixed raw materials are heated and melted in the extrusion process, and a curing agent, a flatting agent, a pigment filler and the like are uniformly dispersed in resin under the action of high shearing force, in general, the extrusion temperature is slightly higher than the softening point of the resin, so that the materials are melted into proper viscosity, high shearing force can be generated during extrusion, the high dispersion of the pigment and the like is facilitated, and all components are formed into a uniform system;
s4: coarse grinding
During coarse crushing, an extruder is provided with a cooling belt and a crushing roller, and extruded materials are directly cooled and crushed, so that the extruded and cooled materials are crushed to the feeding granularity which can be accepted by fine crushing equipment;
s5: double-sieve crushing
The materials crushed after melt extrusion mixing are finely crushed by an air classification mill (commonly called ACM mill), then the ultrafine powder coating is separated and removed by a cyclone separator, and the coarse powder coating is removed by sieving equipment to obtain a product suitable for electrostatic coating of the powder coating, so that the particle size distribution of the powder coating required by electrostatic powder coating is achieved, and the sieving equipment has a double-sieve structure;
s6: bonding
Adding the crushed and screened powder coating into a high-speed mixer with a temperature control jacket, utilizing mechanical high-speed rotation, generating friction in a short time due to different movement speeds between a stirring paddle and a material to be mixed, increasing the temperature of a base material mixture through frictional heat generation, wherein the temperature value is slightly lower than the glass transition temperature of resin, rapidly adding a metal pigment into the powder rotating at high speed under the protection of nitrogen and mechanical high-speed stirring to enable the metal pigment to be bonded on the surface of softened powder coating particles, then rapidly discharging and cooling, and adding the metal pigment in the bonding process to enable the powder coating to have the color corresponding to metal;
s7: detection of
The powder coating after bonding is detected to ensure that the produced powder coating can meet the qualified requirements, and the influence on the use experience of consumers due to the fact that a large number of unqualified products flow into the market is avoided;
s8: packaging and warehousing
And packaging the qualified products, pasting the qualification certificate, and putting the packaged powder coating into a warehouse for sale.
The preparation method can ensure that the powder coating has high impact strength, acid resistance, alkali resistance, salt mist resistance and weather resistance, and the coating surface is flat and smooth, can shorten the curing time, realizes the purposes of energy conservation, low carbon and environmental protection, improves the service performance of the powder coating, and can avoid the oxidative decomposition of matrix resin by adopting a deep thread low-temperature extrusion method in the production process of the powder coating. The adoption of double-screening fine crushing can ensure that the matrix resin particles are small and uniform, and can carry out thin coating, so that the coating effect is better.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A novel high-grade powder coating is characterized in that: the powder coating comprises the following raw materials in percentage by weight: 30-35% of E-12 epoxy resin, 30-35% of weather-resistant resin, 20-30% of a pigment and filler mixture, 1-3% of aluminum silver powder, 0.5-1.5% of a hardening assistant and 1-3% of other assistants.
2. The novel high-grade powder coating and the preparation method thereof according to claim 1, wherein the weather-resistant resin is a polyester resin, and the acid value of the polyester resin is 70.7 mgKOH/g.
3. A new high-grade powder coating according to claim 2, characterized in that the hardening aid is a polypropylene compound.
4. A new high-grade powder coating according to claim 3, characterized in that the other auxiliary agent is one or both of a leveling agent and a brightener.
5. The preparation method of the novel high-grade powder coating according to claim 4, characterized in that the preparation method of the powder coating comprises the following specific steps:
s1: raw material ratio
Respectively installing the raw materials in corresponding parts by weight for weighing, and placing the weighed raw materials beside a high-speed mixer for later use;
s2: premixing
Pouring the raw materials weighed according to the formula into a high-speed mixer for uniform and sufficient mixing, and then leading out the uniformly stirred raw materials from the interior of the high-speed mixer;
s3: melt extrusion
The premixed raw materials are poured into an extruder, the mixed raw materials are heated and melted in the extrusion process, and curing agents, flatting agents, pigments and fillers and the like are uniformly dispersed in resin under the action of high shearing force, generally speaking, the extrusion temperature is slightly higher than the softening point of the resin, so that the materials are melted into proper viscosity, high shearing force can be generated during extrusion, high dispersion of the pigments and the like is facilitated, and all components are formed into a uniform system;
s4: coarse grinding
During coarse crushing, an extruder is provided with a cooling belt and a crushing roller, and extruded materials are directly cooled and crushed, so that the extruded and cooled materials are crushed to the feeding granularity which can be accepted by fine crushing equipment;
s5: double-sieve crushing
The materials crushed after melt extrusion mixing are finely crushed by an air classification mill (commonly called ACM mill), then the ultrafine powder coating is separated and removed by a cyclone separator, and the coarse powder coating is removed by sieving equipment, so that a product suitable for electrostatic coating of the powder coating is obtained, and the particle size distribution of the powder coating required by electrostatic powder coating is achieved;
s6: bonding
Adding the crushed and screened powder coating into a high-speed mixer with a temperature control jacket, utilizing mechanical high-speed rotation, generating friction in a short time due to different movement speeds between a stirring paddle and a material to be mixed, increasing the temperature of a base material mixture through frictional heat generation, wherein the temperature value is slightly lower than the glass transition temperature of resin, rapidly adding a metal pigment into the powder rotating at high speed under the protection of nitrogen and mechanical high-speed stirring to enable the metal pigment to be bonded on the surface of softened powder coating particles, then rapidly discharging and cooling, and adding the metal pigment in the bonding process to enable the powder coating to have the color corresponding to metal;
s7: detection of
The powder coating after bonding is detected to ensure that the produced powder coating can meet the qualified requirements, and the influence on the use experience of consumers due to the fact that a large number of unqualified products flow into the market is avoided;
s8: packaging and warehousing
And packaging the qualified products, pasting the qualification certificate, and putting the packaged powder coating into a warehouse for sale.
6. The method for preparing the novel high-grade powder coating according to claim 5, wherein the raw materials are melted and extruded by a deep-thread low-temperature extrusion method during melt extrusion, so that the oxidative decomposition of the matrix resin can be avoided.
7. The method for preparing the novel high-grade powder coating according to claim 6, wherein the sieving equipment is of a double-sieve structure.
8. The method for preparing a novel high-grade powder coating according to claim 7, wherein a metal pigment is added in the bonding process, so that the powder coating has the color corresponding to that of metal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010498735.7A CN111635691A (en) | 2020-06-04 | 2020-06-04 | Novel high-grade powder coating and preparation method thereof |
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| CN202010498735.7A CN111635691A (en) | 2020-06-04 | 2020-06-04 | Novel high-grade powder coating and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112718069A (en) * | 2020-11-28 | 2021-04-30 | 湖南连心科技有限公司 | Powder coating production mixes broken all-in-one |
| CN114644848A (en) * | 2022-03-23 | 2022-06-21 | 深圳市法鑫忠信新材料有限公司 | Anti-static matte coating and preparation method thereof |
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| CN102250526A (en) * | 2011-05-26 | 2011-11-23 | 安徽美佳新材料股份有限公司 | Aluminum silver powder powdery paint and preparation method |
| CN108373758A (en) * | 2018-02-12 | 2018-08-07 | 浙江华彩新材料有限公司 | A kind of environment-friendly type antibiotic resistance and fingerprint resistance ultrafine powder paint and preparation method thereof |
| CN109593449A (en) * | 2018-12-20 | 2019-04-09 | 重庆七彩虹新材料技术有限公司 | A kind of thermosetting property nano modification powdery paints and preparation method thereof |
| CN111205750A (en) * | 2020-02-17 | 2020-05-29 | 安徽华辉塑业科技股份有限公司 | High-temperature-resistant powder coating and preparation method thereof |
-
2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102250526A (en) * | 2011-05-26 | 2011-11-23 | 安徽美佳新材料股份有限公司 | Aluminum silver powder powdery paint and preparation method |
| CN108373758A (en) * | 2018-02-12 | 2018-08-07 | 浙江华彩新材料有限公司 | A kind of environment-friendly type antibiotic resistance and fingerprint resistance ultrafine powder paint and preparation method thereof |
| CN109593449A (en) * | 2018-12-20 | 2019-04-09 | 重庆七彩虹新材料技术有限公司 | A kind of thermosetting property nano modification powdery paints and preparation method thereof |
| CN111205750A (en) * | 2020-02-17 | 2020-05-29 | 安徽华辉塑业科技股份有限公司 | High-temperature-resistant powder coating and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112718069A (en) * | 2020-11-28 | 2021-04-30 | 湖南连心科技有限公司 | Powder coating production mixes broken all-in-one |
| CN114644848A (en) * | 2022-03-23 | 2022-06-21 | 深圳市法鑫忠信新材料有限公司 | Anti-static matte coating and preparation method thereof |
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