CN111363455A - High-reflectivity powder coating and preparation method thereof - Google Patents
High-reflectivity powder coating and preparation method thereof Download PDFInfo
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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
- C09D5/004—Reflecting paints; Signal paints
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- 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 provides a high-reflectivity powder coating and a preparation method thereof, wherein weather-resistant polyester resin is used as a base material, and is compounded with a proper amount of fluorescent whitening agent, titanium dioxide, reflective pigment, reflective auxiliary agent, flatting agent and anti-yellowing agent, the components are uniformly mixed by a mixing container of a rotating body, the problem of poor interface reaction is reduced, and then melt extrusion is carried out, so that the components have better compatibility, the powder coating with high reflectivity, good whiteness and soft reflected light can be obtained, in addition, the flatting agent and the light diffusant are added, the remarkable synergistic effect is achieved, the overall low-light and high-reflectivity performance of the powder coating can be effectively improved, the addition process is simple, the production energy consumption is not required to be increased, the operability is high, the coating formed by the integrally prepared powder coating has stable gloss, and the powder coating has remarkable soft reflected light, light resistance and heat, can be widely applied to the field of illumination and the field of reflective products.
Description
Technical Field
The invention relates to the field of powder coating preparation, and particularly relates to a high-reflectivity powder coating and a preparation method thereof.
Background
The powder coating is a novel solid powder coating which does not contain solvent. The powder coating has the advantages of no solvent, light pollution, recoverability, environmental protection, energy and resource saving, labor intensity reduction and the like, and is widely applied. In the prior art, the ultraviolet resistance of the material is changed and the light reflection of the surface of the product is improved by plating a layer of metal film on the surface, but the material prepared by the method has poor hand feeling and single appearance, and the metal coating is limited in application range and difficult to popularize in a large scale due to the defects of non-corrosion resistance, volatile reflection removing property and easy heat conduction. In the prior art, the powder coating is applied to a lampshade or some surfaces needing light reflection, so that the light is strong and dazzling, people cannot look directly, a soft visual effect cannot be obtained, and the living and working environments of people are influenced. Or the reflective efficiency is very low, higher power of a light source is needed, the energy consumption is high, the coating film is aged and yellowed after long-time use, the reflective efficiency is further reduced, and the trend of energy conservation and emission reduction is not met.
In addition, according to the current state of the art, highly reflective powder coatings can also be referred to as effect powder coatings, and the interaction of the components in the powder coatings can affect the final overall performance of the prepared powder coatings, while in the prior art, the raw materials are directly added and then melted and extruded in the process of preparing the powder coatings, the mixing uniformity of the raw materials still needs to be improved, and the powder coatings applied to the fields of illumination and light reflection still cannot meet the market demand.
For example, patent No. CN102826810B discloses a reflective heat-insulating powder coating and a preparation method thereof; also, for example, patent No. CN102719178A discloses a powder coating composition; further, WO2012110451A1 discloses a coating composition, which provides a powder coating, but the effect of the coating on reflecting light remains to be studied.
In the field of powder coating preparation, there are many practical problems to be solved in practical applications.
Disclosure of Invention
The invention provides a high-reflectivity powder coating and a preparation method thereof to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-reflectivity powder coating comprises a component A and a component B, wherein the component A comprises the following components in percentage by mass: 55-63% of polyester resin, 0-4.2% of HAA, 0-4.5% of TGIC, 2-5% of fluorescent whitening agent, 22-32% of titanium dioxide, 2-5% of reflective pigment, 2-5% of reflective aid, 3-5% of conventional aid, 0-5% of precipitated barium sulfate, 2-3% of flatting agent and 1-2.5% of anti-yellowing agent, wherein the component B comprises the following components in percentage by mass: 0.2 to 1 percent of external delustering agent and 0.5 to 2 percent of light diffusant.
Optionally, the fluorescent whitening agent is 4, 4' -bis (benzoxazol-2-yl) stilbene.
Optionally, the titanium dioxide is rutile titanium dioxide.
Optionally, the reflective pigment is titanium dioxide coated mica.
Optionally, the reflection aid is an organic polymer containing silicon atoms.
Optionally, the matting agent is a substance compounded by methyl methacrylate acrylic resin and a quaternary ammonium bromide salt catalyst.
Optionally, the anti-yellowing agent is a secondary aromatic amine and/or a hindered phenolic.
Optionally, the light diffuser is an organic silicon light diffuser, and the organic silicon light diffuser is regular spherical particles, and the average median particle size is 1-5 μm.
In addition, the invention also provides a preparation method of the high-reflectivity powder coating, which comprises the following steps:
1) preparing the components according to the components of the component A and the component B, and preparing the components according to the mass percentage for later use;
2) sequentially adding polyester resin, HAA, TGIC, fluorescent whitening agent, titanium dioxide, reflective pigment, reflective additive, conventional additive, precipitated barium sulfate, flatting agent and anti-yellowing agent in the component A which are proportioned according to the mass percentage into a mixing container with a rotating body, stirring and mixing, then sending into an extruder, and obtaining the component A after melt extrusion, tabletting, cooling and crushing;
3) uniformly mixing the delustering agent and the light diffusant in the component B which is prepared according to the mass percentage to obtain a component B;
4) add component A through the feed inlet A of milling machine and carry out the crocus, component A after the crocus gets into the rotary screen of milling machine, and the rotary screen department of milling machine sets up feed inlet B, component B gets into from feed inlet B with certain feed rate the rotary screen for component A and component B sieve simultaneously under the vibration of rotary screen, obtain high reflectivity powder coating.
Optionally, the feed rate of component B is 5-10 g/min.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the powder coating prepared by the invention adopts weather-resistant polyester resin as a base material, and is compounded with a proper amount of fluorescent whitening agent, titanium dioxide, reflective pigment, reflective auxiliary agent, delustering agent and anti-yellowing agent, the components are uniformly mixed by a mixing container of a rotating body, the raw material accumulation with high density is reduced, and the problem of poor interface reaction is solved.
2. The powder coating prepared by the invention is added with the flatting agent and the light diffusant, has obvious synergistic effect, can effectively improve the overall low-light and high-reflectivity performance of the powder coating, and has simple addition process, no need of increasing production energy consumption and strong operability.
3. The powder coating disclosed by the invention is simple in overall formula, simple in overall production process, low in overall production energy consumption, and environment-friendly in overall production process, and the prepared powder coating is stable in coating gloss, has obvious soft light reflection, light resistance and heat resistance, and can be widely applied to the field of illumination and light reflection products.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings.
FIG. 1 is a schematic view of a mixing vessel for a high reflectance powder coating and method of making the same according to one embodiment of the present invention;
FIG. 2 is a schematic view of a mixing vessel for a high reflectance powder coating and a method of making the same according to one embodiment of the present invention;
FIG. 3 is a schematic view of a mixing vessel for a high reflectance powder coating and a method of making the same according to one embodiment of the present invention;
FIG. 4 is a schematic illustration of the mixing of component A of a high reflectance powder coating and its method of preparation in one of the comparative examples of the present invention;
FIG. 5 is a schematic illustration of the mixing of component A in a high reflectance powder coating and method of making the same in one embodiment of the present invention.
Reference numerals:
1-stirring the container body; 11-inner wall; 2-a feeding port; 3-stirring blade.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The present invention is a high reflectance powder coating and a method for preparing the same, according to the following examples shown in FIGS. 1 to 5:
example 1:
the high-reflectivity powder coating comprises a component A and a component B, wherein the component A comprises the following components in percentage by mass: 55-63% of polyester resin, 0-4.2% of HAA, 0-4.5% of TGIC, 2-5% of fluorescent whitening agent, 22-32% of titanium dioxide, 2-5% of reflective pigment, 2-5% of reflective aid, 3-5% of conventional aid, 0-5% of precipitated barium sulfate, 2-3% of flatting agent and 1-2.5% of anti-yellowing agent, wherein the component B comprises the following components in percentage by mass: 0.2 to 1 percent of external delustering agent and 0.5 to 2 percent of light diffusant.
The fluorescent whitening agent is 4, 4' -di (benzoxazol-2-yl) stilbene. In the embodiment, the fluorescent whitening agent excites incident light to generate fluorescence, so that the coating film obtains a sparkling effect similar to fluorite, and the coating film seen by naked eyes has certain whiteness, namely, the intensity of light sensed by human eyes is increased. The fluorescent whitening agent has the action principle that invisible ultraviolet light in light is absorbed, visible blue light is emitted, and the visible blue light and yellow light emitted by the coating film are superposed to form white light in a complementary manner, so that the white light emitted by the coating film is increased, the white coating film can be perceived by naked eyes to be obviously bright and white, and the bright and white effect is achieved.
The titanium dioxide is rutile type titanium dioxide. The addition of rutile titanium dioxide in this embodiment can promote the long-term stable whiteness of the powder coating, improve the light resistance and heat resistance of the powder coating, and ensure that the coating can maintain the original whiteness, high reflectance and no yellowing under long-term illumination.
The reflective pigment is titanium dioxide coated mica. In this embodiment, the reflective pigment can enhance the reflection value and luminous flux of the powder coating, and the addition amount of the reflective pigment and the titanium dioxide powder are properly proportioned, so that the yellow phase of the titanium dioxide powder in the preparation of the powder coating can be effectively eliminated, and the whiteness of the powder coating is not affected.
The reflection auxiliary agent is an organic polymer containing silicon atoms. In this embodiment, the reflection aid plays an auxiliary role, and forms an integral formula system with other components to achieve the effect of high reflectivity.
The delustering agent is a substance compounded by methyl methacrylate acrylic resin and a quaternary ammonium bromide salt catalyst. The addition of the flatting agent can increase the microscopic roughness of the surface of the coating, thereby reducing the gloss of the coating, promoting the light reflection to become softer and enabling people to feel comfortable.
The anti-yellowing agent is a secondary arylamine substance and/or a hindered phenol substance, the secondary arylamine substance comprises diphenylamine or p-phenylenediamine, and the hindered phenol substance comprises dithioether or tetrapentaerythritol ester. The anti-yellowing agent can effectively inhibit or delay substances of polymer oxidative degradation, effectively reduce the yellowing tendency of a coating film at high temperature, and has a particularly remarkable anti-oxidation effect.
The external delustering agent is a substance compounded by ethyl acrylate acrylic resin and a triphenylphosphine catalyst. Through a special additional process and within the addition amount of the invention, the synergistic effect with the flatting agent can be achieved, so that the surface of the coating film has a certain degree of roughness in a microscopic manner and the gloss is reduced.
The light diffusant is organic silicon light diffusant which is regular spherical particles, and the average median particle size is 1-5 mu m. In the embodiment, the organic silicon acrylate polymer mainly has a core-shell structure, and can refract light in a penetrating manner through the difference of refractive indexes of different base materials, so that the purpose of uniform and light transmission is achieved, the scattering and transmission of coating light are increased, a light source and a glaring light source are shielded, the whole coating can emit softer, more attractive and more elegant light, and the comfortable effect of light transmission and opaqueness is achieved. And simultaneously resists high temperature. The addition of the preparation process has more remarkable effect.
In addition, the invention also provides a preparation method of the high-reflectivity powder coating, which comprises the following steps:
1) preparing the components according to the components of the component A and the component B, and preparing the components according to the mass percentage for later use;
2) sequentially adding polyester resin, HAA, TGIC, fluorescent whitening agent, titanium dioxide, reflective pigment, reflective additive, conventional additive, precipitated barium sulfate, flatting agent and anti-yellowing agent in the component A which are proportioned according to the mass percentage into a mixing container with a rotating body, stirring and mixing, then sending into an extruder, and obtaining the component A after melt extrusion, tabletting, cooling and crushing;
the mixing container with the rotating body comprises a mixing container main body, a feed port, a rotating shaft and a mixing blade, wherein the feed port is arranged on one side of the mixing container main body, the rotating shaft is inclined relative to the horizontal plane, one end of the mixing blade is fixedly connected with the inner wall of the mixing container main body, the other end of the mixing blade extends out in the direction far away from the inner wall, the mixing blade and the inner wall form a lifting cavity, and the lifting cavity can synchronously rotate along with the mixing container main body so as to continuously obtain part of material bodies at a lower position, lift the part of material bodies to a higher position and dump the material bodies in the lifting cavity at the higher position;
and the stirring blade is inclined relative to the rotating shaft center, and the inclination direction meets the following requirements: when the lifting cavity moves to the highest position, the material body in the lifting cavity can topple in the direction away from the feeding port of the stirring container main body;
the rotating speed of the mixing container is 2000-;
in the embodiment, the extruder is a twin-screw extruder, the component A is subjected to melt mixing at the rotating speed of 150-220r/min and the temperature of 90-100 ℃, and the extrudate is cooled and crushed into small pieces;
3) uniformly mixing the delustering agent and the light diffusant in the component B which is prepared according to the mass percentage to obtain a component B;
4) adding the component A through a feed port A of a flour mill for milling, enabling the milled component A to enter a rotary sieve of the flour mill, arranging a feed port B at the rotary sieve of the flour mill, enabling the component B to enter the rotary sieve from the feed port B at a certain feeding speed, and enabling the component A and the component B to simultaneously sieve under the vibration action of the rotary sieve to obtain the high-reflectivity powder coating; the feeding speed of the component B is 5-10 g/min.
Example 2:
this embodiment should be understood to include at least all of the features of one of the embodiments described above and further described herein. In this embodiment, a high-reflectivity powder coating is provided, which includes a component a and a component B, where the component a includes the following components by mass percent: 55% of polyester resin, 1.84% of HAA, 2.3% of TGIC, 4% of fluorescent whitening agent, 24.16% of titanium dioxide, 2% of reflective pigment, 2% of reflective aid, 3% of conventional aid, 2% of precipitated barium sulfate, 2% of delustering agent and 1% of anti-yellowing agent, wherein the component B comprises the following components in percentage by mass: 0.2 percent of delustering agent and 0.5 percent of light diffusant are added.
In a preferred embodiment, the optical brightener is 4, 4' -bis (benzoxazol-2-yl) stilbene; the titanium dioxide is rutile type titanium dioxide; the reflective pigment is titanium dioxide coated mica; the reflection auxiliary agent is an organic polymer containing silicon atoms; the delustering agent is a substance compounded by methyl methacrylate acrylic resin and a quaternary ammonium bromide salt catalyst. The anti-yellowing agent is a secondary arylamine substance and/or a hindered phenol substance, the secondary arylamine substance comprises diphenylamine, and the hindered phenol substance comprises disulfide; the external delustering agent is a substance compounded by ethyl acrylate acrylic resin and a triphenylphosphine catalyst; the light diffusant is organic silicon light diffusant which is regular spherical particles, and the average median particle size is 1-5 mu m.
In a preferred embodiment, the present invention also provides a method for preparing a high-reflectivity powder coating, comprising the steps of:
1) preparing the components according to the components of the component A and the component B, and preparing the components according to the mass percentage for later use;
2) sequentially adding polyester resin, HAA, TGIC, fluorescent whitening agent, titanium dioxide, reflective pigment, reflective additive, conventional additive, precipitated barium sulfate, flatting agent and anti-yellowing agent in the component A which are proportioned according to the mass percentage into a mixing container with a rotating body, stirring and mixing, then sending into an extruder, and obtaining the component A after melt extrusion, tabletting, cooling and crushing;
the mixing container with the rotating body comprises a mixing container main body, a feed port, a rotating shaft and a mixing blade, wherein the feed port is arranged on one side of the mixing container main body, the rotating shaft is inclined relative to the horizontal plane, one end of the mixing blade is fixedly connected with the inner wall of the mixing container main body, the other end of the mixing blade extends out in the direction far away from the inner wall, the mixing blade and the inner wall form a lifting cavity, and the lifting cavity can synchronously rotate along with the mixing container main body so as to continuously obtain part of material bodies at a lower position, lift the part of material bodies to a higher position and dump the material bodies in the lifting cavity at the higher position;
and the stirring blade is inclined relative to the rotating shaft center, and the inclination direction meets the following requirements: when the lifting cavity moves to the highest position, the material body in the lifting cavity can topple in the direction away from the feeding port of the stirring container main body;
the rotating speed of the mixing container is 2000r/min, and the mixing time of the component A is 20 min;
in the embodiment, the extruder is a double-screw extruder, the component A is subjected to melt mixing at the rotating speed of 220r/min and the temperature of 100 ℃, and the extrudate is cooled and crushed into small pieces;
3) uniformly mixing the delustering agent and the light diffusant in the component B which is prepared according to the mass percentage to obtain a component B;
4) adding the component A through a feed port A of a flour mill for milling, enabling the milled component A to enter a rotary sieve of the flour mill, arranging a feed port B at the rotary sieve of the flour mill, enabling the component B to enter the rotary sieve from the feed port B at a certain feeding speed, and enabling the component A and the component B to simultaneously sieve under the vibration action of the rotary sieve to obtain the high-reflectivity powder coating; the feed rate of component B was 5 g/min.
Example 3:
this embodiment should be understood to include at least all of the features of one of the embodiments described above and further described herein. In this embodiment, a high-reflectivity powder coating is provided, which includes a component a and a component B, where the component a includes the following components by mass percent: 56% of polyester resin, 2.21% of HAA, 2.0% of TGIC, 2% of fluorescent whitening agent, 22% of titanium dioxide, 2% of reflective pigment, 2% of reflective aid, 3% of conventional aid, 4.09% of precipitated barium sulfate, 2% of delustering agent and 1% of anti-yellowing agent, wherein the component B comprises the following components in percentage by mass: 0.7 percent of delustering agent and 1.0 percent of light diffusant are added.
In a preferred embodiment, the optical brightener is 4, 4' -bis (benzoxazol-2-yl) stilbene; the titanium dioxide is rutile type titanium dioxide; the reflective pigment is titanium dioxide coated mica; the reflection auxiliary agent is an organic polymer containing silicon atoms; the delustering agent is a substance compounded by methyl methacrylate acrylic resin and a quaternary ammonium bromide salt catalyst. The anti-yellowing agent is a secondary arylamine substance and/or a hindered phenol substance, the secondary arylamine substance comprises diphenylamine, and the hindered phenol substance comprises disulfide; the external delustering agent is a substance compounded by ethyl acrylate acrylic resin and a triphenylphosphine catalyst; the light diffusant is organic silicon light diffusant which is regular spherical particles, and the average median particle size is 1-5 mu m.
In a preferred embodiment, the present invention also provides a method for preparing a high-reflectivity powder coating, comprising the steps of:
1) preparing the components according to the components of the component A and the component B, and preparing the components according to the mass percentage for later use;
2) sequentially adding polyester resin, HAA, TGIC, fluorescent whitening agent, titanium dioxide, reflective pigment, reflective additive, conventional additive, precipitated barium sulfate, flatting agent and anti-yellowing agent in the component A which are proportioned according to the mass percentage into a mixing container with a rotating body, stirring and mixing, then sending into an extruder, and obtaining the component A after melt extrusion, tabletting, cooling and crushing;
the mixing container with the rotating body comprises a mixing container main body, a feed port, a rotating shaft and a mixing blade, wherein the feed port is arranged on one side of the mixing container main body, the rotating shaft is inclined relative to the horizontal plane, one end of the mixing blade is fixedly connected with the inner wall of the mixing container main body, the other end of the mixing blade extends out in the direction far away from the inner wall, the mixing blade and the inner wall form a lifting cavity, and the lifting cavity can synchronously rotate along with the mixing container main body so as to continuously obtain part of material bodies at a lower position, lift the part of material bodies to a higher position and dump the material bodies in the lifting cavity at the higher position;
and the stirring blade is inclined relative to the rotating shaft center, and the inclination direction meets the following requirements: when the lifting cavity moves to the highest position, the material body in the lifting cavity can topple in the direction away from the feeding port of the stirring container main body;
the rotating speed of the mixing container is 5000r/min, and the mixing time of the component A is 20 min;
and the inclination angle of the stirring container main body is 45-60 degrees, preferably 50 degrees, and the rotating shaft is arranged on the stirring container main body, and the installation of the rotating shaft can realize the inclination angle of the stirring container main body, which is not described in detail herein. The stirring device arranged in the embodiment aims to increase the more uniform mixing degree of the component A during mixing, and has positive influence on the next step of melt extrusion, so that the component A has more uniform matrix structure and no particle agglomeration phenomenon during melt extrusion, all components are tightly combined, the combination degree of materials is high, and the component A with higher quality is obtained.
In the embodiment, the extruder is a double-screw extruder, the component A is subjected to melt mixing at the rotating speed of 220r/min and the temperature of 100 ℃, and the extrudate is cooled and crushed into small pieces;
3) uniformly mixing the delustering agent and the light diffusant in the component B which is prepared according to the mass percentage to obtain a component B;
4) adding the component A through a feed port A of a flour mill for milling, enabling the milled component A to enter a rotary sieve of the flour mill, arranging a feed port B at the rotary sieve of the flour mill, enabling the component B to enter the rotary sieve from the feed port B at a certain feeding speed, and enabling the component A and the component B to simultaneously sieve under the vibration action of the rotary sieve to obtain the high-reflectivity powder coating; the feed rate of component B was 10 g/min.
Example 4:
this embodiment should be understood to include at least all of the features of any of the embodiments described above and further described herein. In this embodiment, a high-reflectivity powder coating is provided, which includes a component a and a component B, where the component a includes the following components by mass percent: 58% of polyester resin, 2.17% of HAA, 2.2% of TGIC, 3% of fluorescent whitening agent, 22% of titanium dioxide, 2% of reflective pigment, 2% of reflective aid, 3% of conventional aid, 1% of precipitated barium sulfate, 2% of delustering agent and 1.43% of anti-yellowing agent, wherein the component B comprises the following components in percentage by mass: 0.4 percent of delustering agent and 0.8 percent of light diffusant are added. The high reflectance powder coating of this example was prepared as described in example 1 above.
Example 5:
this embodiment should be understood to include at least all of the features of any of the embodiments described above and further described herein. In this embodiment, a high-reflectivity powder coating is provided, which includes a component a and a component B, where the component a includes the following components by mass percent: 58% of polyester resin, 1.07% of HAA, 3.3% of TGIC, 4% of fluorescent whitening agent, 22.13% of titanium dioxide, 2% of reflective pigment, 2% of reflective aid, 3% of conventional aid, 0.8% of precipitated barium sulfate, 2% of delustering agent and 1% of anti-yellowing agent, wherein the component B comprises the following components in percentage by mass: 0.2 percent of delustering agent and 0.5 percent of light diffusant are added. The high reflectance powder coating of this example was prepared as described in example 1 above.
Example 6:
this embodiment should be understood to include at least all of the features of any of the embodiments described above and further described herein. In this embodiment, a high-reflectivity powder coating is provided, which includes a component a and a component B, where the component a includes the following components by mass percent: 59% of polyester resin, 2.24% of HAA, 2.2% of TGIC, 3% of fluorescent whitening agent, 22% of titanium dioxide, 2% of reflective pigment, 2% of reflective aid, 3% of conventional aid, 0.86% of precipitated barium sulfate, 2% of delustering agent and 1% of anti-yellowing agent, wherein the component B comprises the following components in percentage by mass: 0.2 percent of delustering agent and 0.5 percent of light diffusant are added. The high reflectance powder coating of this example was prepared as described in example 1 above.
Comparative example 1:
the only difference from example 3 is that no optical brightener was added.
Comparative example 2:
the difference from example 3 is only that no B component, i.e. no matting agent and no silicone light diffuser, is added.
Comparative example 3:
the only difference from example 3 is that component a was not mixed in the mixing vessel of the present application and was directly fed to the melt extrusion step.
Comparative example 4:
the only difference from example 3 is that the powder coating prepared comprises the following components in mass percent: 50% of polyester resin, 2.77% of HAA, 1% of TGIC, 7% of fluorescent whitening agent, 19.23% of titanium dioxide, 1% of reflective pigment, 1% of reflective aid, 3% of conventional aid, 1% of precipitated barium sulfate, 4% of delustering agent, 5% of anti-yellowing agent and 5% of light diffusant.
And in this comparative example, the powder coating was prepared by the following method:
sequentially adding polyester resin, HAA, TGIC, fluorescent whitening agent, titanium dioxide, reflective pigment, reflective additive, conventional additive, precipitated barium sulfate, flatting agent, anti-yellowing agent and light diffusant into a conventional mixer by mass percent, mixing, putting into an extruder, melting, extruding, tabletting and grinding into powder.
The highly reflective powder coatings prepared in examples 2 to 6 and the powder coatings prepared in comparative examples 1 to 4 were subjected to the relevant index test, and a random commercial powder coating having a high reflectivity as a blank control was obtained, and the test results are shown in table 1 below.
TABLE 1
In the test of the present application, the light resistance was measured by using a xenon lamp for 1000 hours, and the heat resistance was measured under the conditions of 350 ℃ and 24 hours. And the data analysis in table 1 shows that: from comparison of comparative example 1 with example 3, it can be seen that: the formulation ingredients in this application as a whole, the resulting powder coating is a result of the overall effect of the ingredients, where the absence of either ingredient has an effect on the performance of the powder coating in this application; compared with the comparative example 2 and the example 3, the external flatting agent and the external organic silicon diffusing agent have a synergistic effect on the preparation of the powder coating, and the light resistance and the heat resistance of the powder coating are effectively ensured; as can be seen from comparison of comparative example 3 with example 3, the degree of mixing of the raw materials also has an effect on the properties of the powder coating, and therefore, the mixing container in the present application plays a positive role in the preparation of the powder coating; as can be seen from comparison between comparative example 4 and example 3, the component ratio of the powder coating also affects the performance of the powder coating, therefore, the powder coating prepared by the present application has high reflectivity under the combined action of the raw material and raw material ratio and the preparation process, and compared with the commercially available powder coating which is randomly drawn, the powder coating of the present invention has better coating reflection value, luminous flux, light resistance and heat resistance than the commercially available powder coating which is randomly drawn.
In sum, the powder coating disclosed by the invention can obtain a powder coating with high reflectivity, good whiteness and soft reflected light under the compounding action of the components, so that the comfort level and the user experience of a user are improved; the powder coating has the advantages of simple overall formula, simple overall production process, low overall production energy consumption and environment-friendly overall production process, and the prepared powder coating has stable gloss of a coating, has obvious soft light reflection, light resistance and heat resistance, and can be widely applied to the fields of illumination and light reflection products.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention 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 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.
Claims (10)
1. The high-reflectivity powder coating is characterized by comprising a component A and a component B, wherein the component A comprises the following components in percentage by mass: 55-63% of polyester resin, 0-4.2% of HAA, 0-4.5% of TGIC, 2-5% of fluorescent whitening agent, 22-32% of titanium dioxide, 2-5% of reflective pigment, 2-5% of reflective aid, 3-5% of conventional aid, 0-5% of precipitated barium sulfate, 2-3% of flatting agent and 1-2.5% of anti-yellowing agent, wherein the component B comprises the following components in percentage by mass: 0.2 to 1 percent of external delustering agent and 0.5 to 2 percent of light diffusant.
2. The high reflectance powder coating according to claim 1, wherein the fluorescent whitening agent is 4, 4' -bis (benzooxazol-2-yl) stilbene.
3. The high reflectance powder coating according to claim 1, wherein the titanium dioxide is rutile titanium dioxide.
4. The high reflectance powder coating according to claim 1, wherein the reflective pigment is titanium dioxide coated mica.
5. The high reflectance powder coating according to claim 1, wherein the reflection assistant is an organic polymer containing silicon atoms.
6. The high-reflectivity powder coating of claim 1, wherein the matting agent is a compound of methyl methacrylate acrylic resin and a quaternary ammonium bromide salt catalyst.
7. The high reflectance powder coating according to claim 1, wherein the anti-yellowing agent is a secondary aromatic amine and/or a hindered phenol.
8. The high-reflectance powder coating according to claim 1, wherein the light diffuser is a silicone light diffuser, and the silicone light diffuser is a regular spherical particle having an average median particle diameter of 1 to 5 μm.
9. A method of preparing a high reflectance powder coating according to any one of claims 1 to 8, comprising the steps of:
1) preparing the components according to the components of the component A and the component B, and preparing the components according to the mass percentage for later use;
2) sequentially adding polyester resin, HAA, TGIC, fluorescent whitening agent, titanium dioxide, reflective pigment, reflective additive, conventional additive, precipitated barium sulfate, flatting agent and anti-yellowing agent in the component A which are proportioned according to the mass percentage into a mixing container with a rotating body, stirring and mixing, then sending into an extruder, carrying out melt extrusion, tabletting, cooling and crushing to obtain the uniformly mixed component A;
3) uniformly mixing the delustering agent and the light diffusant in the component B which is prepared according to the mass percentage to obtain a component B;
4) feed inlet A through the milling machine adds the component A of misce bene, starts the milling machine and carries out the crocus, and component A after the crocus gets into the rotary screen of milling machine, and the rotary screen department of milling machine sets up feed inlet B, component B gets into from feed inlet B with certain feed rate the rotary screen for component A and component B sieve simultaneously under the vibrating action of rotary screen, obtain high reflectivity powder coating.
10. The method of claim 9, wherein the feeding speed of the component B is 5 to 10 g/min.
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