CN110577660A - organic polymer material and coating method thereof - Google Patents
organic polymer material and coating method thereof Download PDFInfo
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- CN110577660A CN110577660A CN201910748199.9A CN201910748199A CN110577660A CN 110577660 A CN110577660 A CN 110577660A CN 201910748199 A CN201910748199 A CN 201910748199A CN 110577660 A CN110577660 A CN 110577660A
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- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
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- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/061—Special surface effect
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- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
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- 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
- B05D7/02—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 macromolecular substances, e.g. rubber
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- 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
- B05D7/24—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 for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
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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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- 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
- 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
- C09D5/24—Electrically-conducting paints
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- 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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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Abstract
The invention discloses a coating method of an organic polymer material, which comprises the following steps: (1) selecting an organic polymer material, and conducting treatment on the organic polymer material; (2) carrying out preheating treatment on the organic high polymer material subjected to the conductive treatment; (3) coating the organic polymer material subjected to preheating treatment for one time or multiple times by adopting powder coating to form a powder coating; (4) curing the powder coating on the surface of the organic polymer material; (5) and carrying out quality inspection and packaging on the cured organic high polymer material to obtain a finished product. Correspondingly, the invention also provides an organic polymer material prepared by the coating. The method is simple, the process is controllable, the efficiency is high, the environment is protected, the energy is saved, and the decorative effect is rich and various.
Description
Technical Field
the invention relates to the technical field of organic polymer materials, in particular to an organic polymer material and a coating method thereof.
background
An organic polymer material is a polymer material that has fluidity and plasticity under a certain condition, can be processed and molded, and can maintain the shape during processing when it returns to a normal condition, and is generally called a plastic. Plastics are divided into thermoplastic plastics and thermosetting plastics. The plastic defined by the patent is an organic high molecular polymer composite material with the glass transition temperature or the melting point of more than or equal to 90 ℃, and is widely applied to the fields of architectural decoration, household appliances, automobiles, high-speed rails, electronic information, mobile communication and the like.
Because the surface of the plastic is soft, the hand feeling is poor, the weather resistance, the wear resistance and the chemical resistance are poor, and the color is monotonous, and in addition, because the plastic is very common, in order to meet the market requirement, the surface coating is carried out on the plastic part. The traditional coating method adopts solvent type liquid coating for coating, the discharge of VOCs is serious, the atmosphere is seriously polluted, and the coating is one of the fierce ozone and haze. In addition, because the surface of the plastic is inert and poor in temperature resistance, the development of changing the solvent type liquid coating into the water-based liquid coating is slow, and the wide-range popularization and application cannot be achieved.
moreover, since most plastics are insulating materials, the surface resistance is more than 10E12 ohm/square meter, electrostatic powder coating cannot be carried out, or the efficiency of electrostatic powder coating is very low, only 20-30%.
at present, the problems that the plastic conductive method comprises spraying solvent type conductive paint or adding 20-30% of conductive carbon black during plastic processing and forming, the traditional solvent type conductive coating mode has high VOCs content and seriously pollutes the atmosphere, and the mode of adding the conductive carbon black can cause the plastic processing and forming difficulty, the mechanical property of a plastic part is poor, and the color is limited are solved.
in the prior art, the disclosure of which is CN103773189A discloses an edge sealing powder coating for a heat-sensitive substrate and an edge sealing coating and a preparation method thereof, and discloses an edge sealing powder coating for a heat-sensitive substrate, which is formed by electrostatically spraying the edge sealing powder coating on the side surface of the heat-sensitive substrate. The heat-sensitive substrate may be any one of medium density fiberboard, particle board, honeycomb board, cement board or plastic. However, the powder coating of the reference is applied only to the edge portions of the plastic and cement boards, and cannot be applied to the entire surface of the board for decoration, and thus has no decorative effect. And the powder coating is a pure epoxy resin system, is easy to turn yellow and can only be used as a primer. Furthermore, the comparison document does not solve the problem of electric conduction of plastics, and only sprays the powder coating on the side surface of the heat-sensitive substrate plastics by a high-temperature preheating principle instead of an electrostatic adsorption principle, so that the powdering efficiency is very low and is only 20-30%.
That is, when coating organic polymer materials, the prior art can not solve the problems of low efficiency, single decorative effect, environmental pollution, difficult plastic processing and forming, influence on mechanical properties and the like.
disclosure of Invention
The invention aims to solve the technical problem of providing a coating method of an organic polymer material, which has the advantages of simple method, controllable process, high efficiency, environmental protection, energy conservation and rich and various decorative effects.
The invention aims to provide a coating method of an organic polymer material, which does not influence the processing and forming and mechanical properties of the organic polymer material.
in order to achieve the technical effects, the invention provides a coating method of an organic polymer material, which comprises the following steps:
(1) selecting an organic polymer material, and conducting treatment on the organic polymer material;
(2) Carrying out preheating treatment on the organic high polymer material subjected to the conductive treatment;
(3) coating the organic polymer material subjected to preheating treatment for one time or multiple times by adopting powder coating to form a powder coating;
(4) Curing the powder coating on the surface of the organic polymer material;
(5) and carrying out quality inspection and packaging on the cured organic high polymer material to obtain a finished product.
as an improvement of the scheme, the organic polymer material is plastic, and the glass transition temperature or the melting point of the organic polymer material is more than or equal to 90 ℃.
as an improvement of the scheme, after the organic polymer material is subjected to conductive treatment, the surface resistance of the organic polymer material is 10E4-10E8 ohm/square meter.
As an improvement of the scheme, the organic polymer material is subjected to conductive treatment by adding a multi-wall carbon nanotube pre-dispersion.
as an improvement of the scheme, in the step (1), when the organic polymer material is in a flat plate structure, cleaning the flat plate-shaped organic polymer material and coating a conductive coating to obtain the conductive organic polymer material;
When the organic polymer material is in a special-shaped structure, the organic polymer material and the conductive additive are mixed, injected or extruded to form, and the conductive organic polymer material is obtained.
as an improvement of the above scheme, the conductive coating comprises a cured coating and a multi-walled carbon nanotube pre-dispersion, wherein the addition amount of the multi-walled carbon nanotube pre-dispersion in the conductive coating is 0.1-5%;
The conductive additive is a multi-walled carbon nanotube pre-dispersion body, and the addition amount of the conductive additive in the conductive organic high polymer material is 0.1-5%.
as an improvement of the scheme, in the step (2), the temperature of the preheating treatment is 40-60 ℃ and the time is 1-10 minutes.
As an improvement of the above scheme, in the step (3), the powder coating is uniformly coated on the surface of the organic polymer material by electrostatic spraying.
In the step (3), the organic polymer material is coated once by using a powder coating, and the powder coating is an ultralow-temperature powder coating.
In the step (3), the organic polymer material is coated for a plurality of times by using the powder coating, the first coating is carried out by using the ultralow-temperature powder coating, and then the other times of coating are carried out by using the conductive ultralow-temperature powder coating.
As an improvement of the scheme, the conductive ultralow-temperature powder coating comprises 95-99.9% of ultralow-temperature powder coating and 0.1-5% of multi-wall carbon nanotube pre-dispersion, and the surface resistivity of the conductive ultralow-temperature powder coating is 10E4-10E8 ohm/square meter.
as an improvement of the scheme, the glass transition temperature of the ultralow temperature powder coating is 40-55 ℃, the gelling time is 50-150s at 110 ℃, the curing temperature is 90-130 ℃, the curing time is 2-10min, and the spraying particle size is 5-25 mu m.
As an improvement of the scheme, the ultralow-temperature powder coating is prepared by the following method:
(A) Mixing polyester resin and auxiliary materials, extruding into sheets to obtain polyester sheet-shaped objects;
(B) Mixing and extruding epoxy resin and auxiliary materials into sheets to obtain epoxy resin sheet-shaped objects;
(C) mixing the polyester sheet material in the step (A) and the epoxy resin sheet material in the step (B) in proportion, and crushing the mixture to 25-60 mu m to obtain first powder material;
(D) crushing the first powder in the step (C) to 3-35 mu m, and grading to obtain a second powder of 5-25 mu m;
(E) crushing the auxiliary agent to 1-9 mu m to obtain third powder;
(F) mixing the second powder material obtained in the step (D) with the third powder material obtained in the step (E) in proportion.
As a modification of the above scheme, the polyester sheet of the step (A) and the epoxy resin sheet of the step (B) are as follows (1-3): (1-3) mixing;
the second powder material of the step (D) and the third powder material of the step (E) are mixed according to the ratio of (70-100): (1-15) mixing.
As an improvement of the scheme, the auxiliary agent comprises one or more of a catalyst, an anti-sticking agent, a defoaming agent and a multi-wall carbon nanotube pre-dispersion body;
Wherein the defoaming agent is a fluorine-containing surfactant or polyethylene wax with the melting point lower than 80 ℃;
the anti-sticking agent is one or a combination of nano inorganic filler, nano fumed silica and nano fumed alumina, and the nano inorganic filler is one or a combination of nano silicon nitride, nano calcium carbonate, nano zirconium oxide and nano aluminum hydroxide.
As an improvement of the scheme, in the step (C), the polyester sheet-shaped material and the epoxy resin sheet-shaped material are crushed to 25-60 μm by a millstone airflow crusher;
in the step (D), the first powder is airflow-pulverized to 3-35 μm by a supersonic fluidized bed;
In the step (E), the auxiliary agent is airflow-pulverized to 1-9 μm by using a supersonic fluidized bed.
as an improvement of the above scheme, after the step (4) and before the step (5), the method further comprises the following steps:
And decorating the cured organic polymer material.
as an improvement of the above scheme, the decoration treatment is any one of the following steps:
Carrying out ink-jet printing on the powder coating on the surface of the organic polymer material;
Polishing the powder coating on the surface of the organic polymer material;
Coating the powder coating on the surface of the organic polymer material with water-based paint;
And polishing the powder coating on the surface of the organic polymer material.
Correspondingly, the invention also discloses an organic polymer material prepared by the coating method.
the implementation of the invention has the following beneficial effects:
(1) the invention firstly conducts the conductive treatment to the organic high polymer material, improves the surface resistance of the plastic to 10E4-10E8 ohm/square meter, is positioned in the semiconductor region, is convenient for electrostatic coating, greatly improves the coating efficiency of the powder coating, and the coating efficiency reaches 80-90%. Then the organic polymer material after the conductive treatment is preheated, and then the powder coating is coated, so that the invention utilizes the powder coating to carry out various decorative effects on the surface of the organic polymer material, can form pure color or various 2D and 3D patterns, can freely adjust the glossiness, and has various decorative effects.
the coating method is simple, production equipment is simple, the process is controllable, no solvent participates in the whole coating production process, no VOCs is released, no waste is generated, and the powder coating formed on the surface of the organic high polymer material has the advantages of zero VOCs, high hardness, good strength, strong adhesive force, corrosion resistance, good wiping resistance and the like.
(2) The invention preferably adopts the ultralow temperature powder coating to coat the surface of the organic polymer material, the performance of the ultralow temperature powder coating is consistent with that of the organic polymer material, and a powder coating with excellent performance can be formed on the surface of the organic polymer material.
(3) The ultralow-temperature powder coating is preferably prepared by a special process, the problems of adhesion and agglomeration are avoided in the process of recycling the powder coating, the storage stability is good, the storage period reaches 60 days under the constant temperature condition, and the gloss is not changed.
(4) According to the invention, the organic polymer material is preferably subjected to conductive treatment by adding the multi-wall carbon nanotube pre-dispersion, so that the resistivity of the surface of the plastic is effectively reduced, the surface resistance of the plastic is increased to 10E4-10E8 ohm/square meter, and the plastic is positioned in a semiconductor region, and is convenient for electrostatic coating. Moreover, the adoption of the multi-wall carbon nano tube pre-dispersion does not influence the processing and forming of plastics, and simultaneously can keep the excellent mechanical properties of the plastics.
drawings
FIG. 1 is a flow chart of a method for coating an organic polymer material according to the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
because the surface of the plastic is soft, the hand feeling is poor, the weather resistance, the wear resistance and the chemical resistance are poor, the color is monotonous, and when the organic polymer material is coated, the problems of low efficiency, single decorative effect, environmental pollution, difficult plastic processing and forming, influence on mechanical property and the like cannot be simultaneously solved in the prior art.
Therefore, the present invention provides a coating method of an organic polymer material, as shown in fig. 1, comprising:
S101, selecting an organic polymer material, and conducting treatment on the organic polymer material.
The organic polymer material is plastic, and the glass transition temperature or melting point of the organic polymer material is more than or equal to 90 ℃.
the organic polymer material is firstly subjected to conductive treatment in various modes, and after the conductive treatment, the surface resistance of the organic polymer material is 10E4-10E8 ohm/square meter and is in a semiconductor interval.
Preferably, the organic polymer material is subjected to conductive treatment by adding the multi-wall carbon nanotube pre-dispersion, so that the processing and forming of plastics are not influenced, and the excellent mechanical properties of the plastics can be maintained.
Specifically, when the organic polymer material is a flat plate structure, the flat plate-shaped organic polymer material is cleaned and coated with a conductive coating to obtain the conductive organic polymer material. The conductive coating comprises a cured coating and a multi-walled carbon nanotube pre-dispersion body, wherein the addition amount of the multi-walled carbon nanotube pre-dispersion body in the conductive coating is 0.1-5%. The cured coating is provided according to the prior art.
When the organic polymer material is in a special-shaped structure, the organic polymer material and the conductive additive are mixed, injected or extruded to form, and the conductive organic polymer material is obtained. The conductive additive is a multiwalled carbon nanotube pre-dispersion body, and the addition amount of the conductive additive in the conductive organic high polymer material is 0.1-5%.
the addition amount% of the multi-walled carbon nanotube pre-dispersion is weight percent.
s102, carrying out preheating treatment on the organic polymer material after the conducting treatment.
preferably, the temperature of the preheating treatment is 40-60 ℃ and the time is 1-10 minutes. After the conductive treatment and before the powder coating, the plastic is subjected to preheating treatment, so that the air in the plastic part can be expelled, and the defect that the air in the part escapes to bring bubbles on the surface of a paint film in the coating and curing process is overcome. Preferably, the preheating temperature is 45-55 ℃ and the preheating time is 1-3 minutes.
S103, coating the organic polymer material subjected to the preheating treatment for one time or multiple times by using powder coating to form a powder coating.
The invention adopts solid powder coating with 100 percent solid content, has high coating efficiency, the thickness of one time of the coating reaches 70-100 microns, is equivalent to that of liquid coating for spraying for 3-4 times, is close to zero VOCs emission, the over-sprayed powder coating can be recycled, the utilization rate is close to 100 percent, the comprehensive performance of the coating is superior to that of the liquid coating, the raw materials of polyester, epoxy and other resins are nontoxic and easy to obtain, the price is lower than that of the common polyurethane and acrylic resin of the liquid coating, and the coating is obviously superior to the liquid coating in the aspects of adhesive force, water resistance and weather resistance.
The solid powder coating of the invention is preferably ultra-low temperature powder coating, the glass transition temperature of the ultra-low temperature powder coating is 40-55 ℃, the gelling time is 50-150s at 110 ℃, the curing temperature is 90-130 ℃, the curing time is 2-10min, and the spraying particle size is 5-25 μm. The powder coating can be uniformly coated on the surface of the plastic product through electrostatic spraying.
the invention utilizes the ultralow temperature powder coating to perform various decorative effects on the surface of the plastic, and the thickness of the powder coating coated on the surface of the plastic product is 5-30 μm, preferably 5-20 μm, and more preferably 5-10 μm. The spraying particle size of the ultralow-temperature powder coating is 5-25 mu m, the ultralow-temperature powder coating has a high leveling effect, and the powder coating can be uniformly coated on the surface of plastic. If the particle size of the powder coating is less than 5 μm, the production efficiency is low in the powder preparation process, and the agglomeration phenomenon is easy to occur during spraying. If the particle size of the powder coating is larger than 25 μm, the surface smoothness of the coating film is deteriorated, and it is difficult to form a coating film having a uniform thickness on the surface of the plastic.
the glass transition temperature is 40-60 ℃, the gelling time is 50-150s at 110 ℃, and the reaction speed is high. The curing temperature is 90-130 ℃, the curing time is 2-10min, and the temperature resistance, the shrinkage rate and the like of the ultralow-temperature powder coating and the plastic are matched, so that the powder coating with excellent performance, high hardness, good strength, strong adhesive force and good corrosion resistance is obtained.
the organic polymer material is coated once or for many times by using the powder coating, and for matte products, the requirement can be met only by one-time powder coating, and for products requiring high or high gloss, the organic polymer material is coated for many times (preferably 2-5 times). Since the powder coating is an insulating material, the conductivity of the plastic surface is rapidly reduced after each powder coating, so that N-1 times of conductive powder coating is required, wherein N is the total coating times of the powder coating.
specifically, for the matte product, the organic polymer material is coated once by using powder coating, the powder coating is selected from ultralow-temperature powder coating, and the technical details of the ultralow-temperature powder coating are the same as those of the ultralow-temperature powder coating and are not repeated here.
For products requiring high or high light, the organic high polymer material is coated for multiple times by adopting powder coating, the first coating is carried out by using ultralow temperature powder coating, and then the other times of coatings are carried out by using conductive ultralow temperature powder coating. The technical details of the ultralow temperature powder coating are the same as those of the ultralow temperature powder coating, and are not described herein again. The conductive ultralow-temperature powder coating comprises 95-99.9% of the ultralow-temperature powder coating and 0.1-5% of multi-wall carbon nanotube pre-dispersion, and the surface resistivity of the conductive ultralow-temperature powder coating is 10E4-10E8 ohm/square meter.
it should be noted that any ultralow temperature powder coating on the market can be selected, as long as the requirement that the vitrification temperature is 40-60 ℃ and the curing temperature is 90-130 ℃ is met. Preferred embodiments of ultra-low temperature powder coatings are described below:
in a preferred embodiment of the present invention, the ultra-low temperature powder coating comprises the following raw materials: the polyester resin, the epoxy resin and auxiliaries, wherein the auxiliaries comprise one or more of a catalyst, an anti-sticking agent and a defoaming agent.
The main material of the ultralow-temperature powder coating is main polyester resin containing carboxyl, the glass transition temperature is 40-60 ℃, the acid value is 10-75, and the curing temperature is 90-130 ℃. And then low-temperature curing (80-90 ℃) liquid or low-viscosity solid epoxy resin is adopted, a high-efficiency catalyst is utilized to carry out low-temperature ring-opening reaction on the epoxy resin, a novel defoaming agent is added to carry out degassing and defoaming, and a novel anti-sticking agent is added to better solve the problems of adhesion and caking.
the catalyst may be 2-methylimidazole, 2-phenylimidazoline, tertiary amine and its salt, triphenylphosphine and its phosphine salt, and aryl isocyanate adduct, but is not limited thereto.
the defoamer is preferably a fluorosurfactant or polyethylene wax having a melting point below 80 ℃. The traditional powder coating formula adopts benzoin for degassing and defoaming, the sublimation temperature of the benzoin is above 120 ℃, the ultralow-temperature powder coating formula cannot be degassed by the benzoin, and therefore, the fluorine-containing surfactant or the polyethylene wax with the melting point lower than 80 ℃ is selected and added in a dry mixing mode.
the anti-sticking agent is one or a combination of nano inorganic filler, nano fumed silica and nano fumed alumina, and the nano inorganic filler is one or a combination of nano silicon nitride, nano calcium carbonate, nano zirconium oxide and nano aluminum hydroxide. Because the glass transition temperature (40-55 ℃) of the powder coating is very close to the coating application environment temperature (30-45 ℃) in autumn and summer, the overspray powder coating is easy to agglomerate or adhere to the surface of recovery equipment to block a filter device in the recovery equipment, which is one of the difficulties of the industrial application of the ultralow temperature powder coating. Therefore, the invention adds nano inorganic substance as anti-sticking agent on the basis of three-component ultrafine powder solid mixing (polyester resin, epoxy resin and catalyst), and better solves the problems of adhesion and agglomeration of powder coating in a recovery system. Preferably, the anti-sticking agent is one or a combination of nano inorganic filler, nano fumed silica and nano fumed alumina, the nano inorganic filler is one or a combination of nano silicon nitride, nano calcium carbonate, nano zirconia and nano aluminum hydroxide, wherein the nano inorganic filler accounts for 20-90%, and the nano fumed silica and/or nano fumed alumina accounts for 10-80%. More preferably, the anti-sticking agent is a combination of nano aluminum hydroxide and nano fumed silica/nano fumed alumina, wherein the nano aluminum hydroxide accounts for 20-90%, and the nano fumed silica/nano fumed alumina accounts for 10-80%.
Furthermore, because the curing temperature of the ultra-low temperature powder coating is overlapped with the production and processing temperature of the traditional powder coating, the ultra-low temperature powder coating is difficult to be prepared by adopting the whole mixing extrusion production process of the traditional powder coating. Moreover, the reaction speed of the ultralow-temperature powder coating is very high, the glossiness and the gelling time of the coating are obviously changed after the ultralow-temperature powder coating is stored for one day at the constant temperature of 20 ℃, and gelled particles appear on the coating after three days and cannot be used basically; can be stored at 0 deg.C for only one week. Therefore, the ultralow-temperature powder coating is prepared by the following method:
(A) Mixing polyester resin and auxiliary materials, extruding into sheets to obtain polyester sheet-shaped objects;
(B) Mixing and extruding epoxy resin and auxiliary materials into sheets to obtain epoxy resin sheet-shaped objects;
(C) mixing the polyester sheet material in the step (A) and the epoxy resin sheet material in the step (B) in proportion, and crushing the mixture to 25-60 mu m to obtain first powder material;
(D) Crushing the first powder in the step (C) to 3-35 mu m, and grading to obtain a second powder of 5-25 mu m;
(E) Crushing the auxiliary agent to 1-9 mu m to obtain third powder;
(F) Mixing the second powder material obtained in the step (D) with the third powder material obtained in the step (E) in proportion.
wherein the polyester sheet material of the step (A) and the epoxy resin sheet material of the step (B) are as follows (1-3): (1-3) mixing; the second powder material of the step (D) and the third powder material of the step (E) are mixed according to the ratio of (70-100): (1-15) mixing. Preferably, the polyester sheet of the step (A) and the epoxy resin sheet of the step (B) are prepared according to the following steps (1-2): (1-2) mixing; the second powder material obtained in the step (D) and the third powder material obtained in the step (E) are mixed according to a ratio of 100: (2-8) mixing.
The auxiliary materials are selected according to the prior art, and only polyester resin and epoxy resin are extruded to form a sheet-shaped object.
mixing the catalyst and the anti-bonding auxiliary agent in a supersonic fluidized bed jet mill, and crushing the mixture to 1-9 microns by adopting the coating method; then the crystalline unsaturated polyester is physically mixed with the main coating component in proportion, the contact between the catalyst and the main epoxy resin is isolated when the crystalline unsaturated polyester coated outside is not melted, the gloss is not changed when the storage period reaches 60 days at the constant temperature of 24 ℃, the gelling time is only reduced by 10 percent, and the problem of industrial application and storage is solved.
As the particle size of the ultra-low temperature powder coating is sprayed to be 5-25 microns, the traditional mechanical millstone airflow pulverization process for producing the powder coating cannot meet the requirement of the particle size, and the invention needs to adopt millstone airflow pulverization combined with supersonic fluidized bed airflow pulverization for two-stage pulverization. Specifically, in the step (C), the polyester sheet-shaped material and the epoxy resin sheet-shaped material are crushed to 25-60 μm by a millstone airflow crusher; in the step (D), the first powder is airflow-pulverized to 3-35 μm by a supersonic fluidized bed; in the step (E), the auxiliary agent is airflow-pulverized to 1-9 μm by using a supersonic fluidized bed.
and S104, curing the powder coating on the surface of the organic polymer material.
The invention adopts the form of heating curing, the curing treatment is preferably infrared curing or hot air curing, the curing temperature is preferably 90-130 ℃, and the curing time is preferably 3-5 minutes, but the invention is not limited to the above.
for high-gloss products, in order to ensure the fullness and mirror effect of the products, powder coating needs to be carried out for many times, and a film needs to be solidified to form after each time of powder coating, so that a durable powder coating is formed.
S105, carrying out quality inspection and packaging on the cured organic high polymer material to obtain a finished product.
as a more preferred embodiment of the present invention, after step S104 and before step S105, the method further includes:
Carrying out decoration treatment on the cured organic polymer material, wherein the decoration treatment comprises any one of the following steps:
Carrying out ink-jet printing on the powder coating on the surface of the organic polymer material;
polishing the powder coating on the surface of the organic polymer material;
Coating the powder coating on the surface of the organic polymer material with water-based paint;
And polishing the powder coating on the surface of the organic polymer material.
The invention adopts any one of the decoration treatment modes of the formed powder coating according to the appearance requirement of the product, such as: diversified fine patterns can be formed by ink-jet printing; dust particles can be removed by grinding; the mirror surface can be flattened by polishing; for organic polymer materials with complex modeling requirements, water-based paint can be adopted for coating, so that manual treatment is avoided. The water-based paint can be a two-component polyurethane water-based paint or a water-based polyurethane radiation curing paint with good leveling property and high hardness, but is not limited to the above.
correspondingly, the invention also discloses an organic polymer material prepared by the coating method. The prepared surface coating of the organic polymer material has the performance of free adjustment of formaldehyde, VOCs, various 2D or 3D patterns or pure colors, free adjustment of glossiness, pencil hardness of more than 1H-2H, adhesion of more than 1 grade by a grid method, and acetone resistance of more than 50 times of wiping.
the present invention will be further illustrated by the following specific examples, wherein examples 1 to 3 are for preparing ultra-low temperature powder coating, and examples 4 to 8 are for coating organic polymer material, and the specific examples are as follows:
example 1
preparing an ultra-low temperature powder coating, comprising:
(A) mixing 40 parts of polyester resin and auxiliary materials, and extruding into a sheet to obtain a polyester sheet;
(B) Mixing 40 parts of epoxy resin and auxiliary materials, and extruding into sheets to obtain epoxy resin sheet-shaped objects;
(C) mixing the polyester sheet-shaped object obtained in the step (A) and the epoxy resin sheet-shaped object obtained in the step (B) according to the proportion of 1:1, mixing in proportion, and crushing to 25-60 mu m by a millstone jet mill to obtain first powder;
(D) adopting supersonic fluidized bed gas flow to the first powder in the step (C) to reach 3-35 μm, and obtaining second powder with 5-25 μm after grading;
(E) and (2) crushing 5 parts of auxiliary agent to 1-9 microns by adopting a supersonic fluidized bed to obtain a third powder material, wherein the auxiliary agent comprises 2 parts of catalyst, 1 part of anti-sticking agent and 2 parts of defoaming agent, the catalyst is 2-methylimidazole, the defoaming agent is polyethylene wax, the anti-sticking agent is a composition of nano aluminum hydroxide and nano fumed silica, and the nano aluminum hydroxide: nano fumed silica 1: 4;
(F) mixing the second powder obtained in the step (D) and the third powder obtained in the step (E) according to a ratio of 80: and 5, mixing in proportion.
Example 2
preparing an ultra-low temperature powder coating, comprising:
(A) mixing 40 parts of polyester resin and auxiliary materials, and extruding into a sheet to obtain a polyester sheet;
(B) Mixing 60 parts of epoxy resin and auxiliary materials, and extruding into sheets to obtain epoxy resin sheet-shaped objects;
(C) Mixing the polyester sheet material obtained in the step (A) and the epoxy resin sheet material obtained in the step (B) according to the proportion of 2: 3, mixing in proportion, and crushing to 25-60 mu m by using a millstone airflow mill to obtain first powder;
(D) adopting supersonic fluidized bed gas flow to the first powder in the step (C) to reach 3-35 μm, and obtaining second powder with 5-25 μm after grading;
(E) And (2) crushing 8 parts of auxiliary agent to 1-9 microns by adopting a supersonic fluidized bed to obtain a third powder material, wherein the auxiliary agent comprises 4 parts of catalyst, 2 parts of anti-sticking agent and 2 parts of defoaming agent, the catalyst is 2-phenylimidazoline, the defoaming agent is fluorine-containing surfactant, the anti-sticking agent is a composition of nano calcium carbonate and nano gas-phase alumina, and the nano aluminum hydroxide: nano gas-phase alumina is 1: 1;
(F) mixing the second powder obtained in the step (D) and the third powder obtained in the step (E) according to a ratio of 100: and 8, mixing.
Example 3
preparing an ultra-low temperature powder coating, comprising:
(A) mixing 50 parts of polyester resin and auxiliary materials, and extruding into a sheet to obtain a polyester sheet;
(B) Mixing 50 parts of epoxy resin and auxiliary materials, and extruding into sheets to obtain epoxy resin sheet-shaped objects;
(C) Mixing the polyester sheet-shaped object obtained in the step (A) and the epoxy resin sheet-shaped object obtained in the step (B) according to the proportion of 1:1, mixing in proportion, and crushing to 25-60 mu m by a millstone jet mill to obtain first powder;
(D) Adopting supersonic fluidized bed gas flow to the first powder in the step (C) to reach 3-35 μm, and obtaining second powder with 5-25 μm after grading;
(E) And (2) crushing 10 parts of auxiliary agent to 1-9 microns by adopting a supersonic fluidized bed to obtain third powder, wherein the auxiliary agent comprises 3 parts of catalyst, 4 parts of anti-sticking agent and 3 parts of defoaming agent, the catalyst is triphenylphosphine and phosphonium salt thereof, the defoaming agent is polyethylene wax, the anti-sticking agent is a composition of nano aluminum hydroxide and nano fumed silica, and the nano aluminum hydroxide: nano fumed silica 9: 1;
(F) Mixing the second powder obtained in the step (D) and the third powder obtained in the step (E) according to a ratio of 100: mixing at a ratio of 10.
Example 4
The coating method of the organic polymer material comprises the following steps:
(1) selecting an organic polymer material (namely plastic) with a flat plate structure, cleaning the organic polymer material, coating a conductive coating on the organic polymer material, and performing conductive treatment, wherein the conductive coating comprises 99.9% of a cured coating (the model is UV001) and 0.1% of a multi-walled carbon nanotube pre-dispersion body;
(2) preheating the organic polymer material subjected to the conductive treatment, wherein the preheating treatment temperature is 40 ℃ and the preheating treatment time is 10 minutes;
(3) carrying out primary coating on the organic high polymer material subjected to preheating treatment by adopting a commercial ultralow-temperature powder coating through electrostatic spraying to form a powder coating, wherein the vitrification temperature of the ultralow-temperature powder coating is 40 ℃, the gelling time is 80s at 110 ℃, the curing temperature is 100 ℃, the curing time is 5min, and the spraying particle size is 5-25 mu m;
(4) Curing the powder coating on the surface of the organic polymer material;
(5) And carrying out quality inspection and packaging on the cured organic high polymer material to obtain a finished product.
example 5
The coating method of the organic polymer material comprises the following steps:
(1) Selecting an organic polymer material (namely plastic) with a flat plate structure, cleaning the organic polymer material, coating a conductive coating on the organic polymer material, and conducting treatment, wherein the conductive coating comprises 98% of cured coating (the model is UV001) and 2% of multi-walled carbon nanotube pre-dispersion;
(2) preheating the organic polymer material subjected to the conductive treatment, wherein the preheating treatment temperature is 50 ℃ and the preheating treatment time is 4 minutes;
(3) carrying out primary coating on the organic high polymer material subjected to preheating treatment by adopting a commercial ultralow-temperature powder coating through electrostatic spraying to form a powder coating, wherein the vitrification temperature of the ultralow-temperature powder coating is 45 ℃, the gelling time is 100s at 110 ℃, the curing temperature is 110 ℃, the curing time is 6min, and the spraying particle size is 5-25 mu m;
(4) curing the powder coating on the surface of the organic polymer material;
(5) carrying out secondary coating on the organic high polymer material subjected to preheating treatment by adopting a conductive ultralow-temperature powder coating through electrostatic spraying to form a powder coating, wherein the conductive ultralow-temperature powder coating comprises 97% of the ultralow-temperature powder coating obtained in the step (3) and 3% of a multiwalled carbon nanotube pre-dispersion body;
(6) curing the powder coating on the surface of the organic polymer material;
(7) carrying out ink-jet printing on the powder coating on the surface of the organic polymer material;
(8) and performing quality inspection and packaging on the organic high polymer material subjected to ink-jet printing to obtain a finished product.
example 6
The coating method of the organic polymer material comprises the following steps:
(1) Selecting an organic polymer material (namely plastic) with a flat plate structure, cleaning the organic polymer material, coating a conductive coating on the organic polymer material, and conducting treatment, wherein the conductive coating comprises 95% of cured coating (the model is UV001) and 5% of multi-walled carbon nanotube pre-dispersion;
(2) preheating the organic polymer material subjected to the conductive treatment, wherein the preheating treatment temperature is 60 ℃ and the preheating treatment time is 2 minutes;
(3) carrying out primary coating on the organic high polymer material subjected to preheating treatment by using the ultralow-temperature powder coating described in embodiment 1 through electrostatic spraying to form a powder coating;
(4) Curing the powder coating on the surface of the organic polymer material;
(5) Carrying out secondary coating on the organic high polymer material subjected to preheating treatment by adopting a conductive ultralow-temperature powder coating through electrostatic spraying to form a powder coating, wherein the conductive ultralow-temperature powder coating comprises 98% of the ultralow-temperature powder coating obtained in the step (3) and 2% of a multiwalled carbon nanotube pre-dispersion body;
(6) curing the powder coating on the surface of the organic polymer material;
(7) carrying out third coating on the organic high polymer material subjected to preheating treatment by adopting a conductive ultralow-temperature powder coating through electrostatic spraying to form a powder coating, wherein the conductive ultralow-temperature powder coating comprises 99% of the ultralow-temperature powder coating obtained in the step (3) and 1% of a multiwalled carbon nanotube pre-dispersion body;
(8) curing the powder coating on the surface of the organic polymer material;
(9) Polishing the powder coating on the surface of the organic polymer material;
(10) And carrying out quality inspection and packaging on the polished organic high polymer material to obtain a finished product.
Example 7
the coating method of the organic polymer material comprises the following steps:
(1) selecting an organic polymer material (namely plastic) with a special-shaped structure, and extruding and molding the organic polymer material and a conductive additive, wherein the addition amount of the conductive additive in the conductive organic polymer material is 5%;
(2) preheating the organic polymer material subjected to the conductive treatment, wherein the preheating treatment temperature is 48 ℃ and the preheating treatment time is 6 minutes;
(3) Carrying out primary coating on the organic high polymer material subjected to preheating treatment by adopting the ultralow-temperature powder coating described in embodiment 2 through electrostatic spraying to form a powder coating;
(4) Curing the powder coating on the surface of the organic polymer material;
(5) and carrying out quality inspection and packaging on the cured organic high polymer material to obtain a finished product.
Example 8
the coating method of the organic polymer material comprises the following steps:
(1) Selecting an organic polymer material (namely plastic) with a special-shaped structure, and extruding and molding the organic polymer material and a conductive additive, wherein the addition amount of the conductive additive in the conductive organic polymer material is 3%;
(2) preheating the organic polymer material subjected to the conductive treatment, wherein the preheating treatment temperature is 55 ℃ and the preheating treatment time is 7 minutes;
(3) carrying out primary coating on the organic high polymer material subjected to preheating treatment by using the ultralow-temperature powder coating described in embodiment 3 through electrostatic spraying to form a powder coating;
(4) Curing the powder coating on the surface of the organic polymer material;
(5) carrying out secondary coating on the organic high polymer material subjected to the preheating treatment by adopting a conductive ultralow-temperature powder coating through electrostatic spraying to form a powder coating, wherein the conductive ultralow-temperature powder coating comprises 99% of the ultralow-temperature powder coating obtained in the step (3) and 1% of a multiwalled carbon nanotube pre-dispersion body;
(6) curing the powder coating on the surface of the organic polymer material;
(7) coating the powder coating on the surface of the organic polymer material with water-based paint;
(8) Polishing the organic polymer material coated with the water-based paint;
(9) and carrying out quality inspection and packaging on the polished organic high polymer material to obtain a finished product.
the organic polymer materials described in examples 4 to 8 were subjected to technical tests, and the results were as follows:
It should be noted that the technical parameters in the above table are detected according to the following method: surface hardness was measured according to ISO15184, adhesion was measured according to ISO 2409, chemical resistance was measured according to ISO 2812-1, gloss was measured according to ISO 2813, wet heat resistance was measured according to DIN50017, and QUVA was measured according to ASTM G53.
while the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (19)
1. A method for coating an organic polymer material, comprising:
(1) Selecting an organic polymer material, and conducting treatment on the organic polymer material;
(2) Carrying out preheating treatment on the organic high polymer material subjected to the conductive treatment;
(3) Coating the organic polymer material subjected to preheating treatment for one time or multiple times by adopting powder coating to form a powder coating;
(4) Curing the powder coating on the surface of the organic polymer material;
(5) And carrying out quality inspection and packaging on the cured organic high polymer material to obtain a finished product.
2. The method for coating an organic polymer material according to claim 1, wherein the organic polymer material is a plastic having a glass transition temperature or a melting point of not less than 90 ℃.
3. The method of coating an organic polymer material according to claim 1, wherein the surface resistance of the organic polymer material after the conductive treatment is 10E4-10E8 ohm/sq.
4. The method for coating an organic polymer material according to claim 3, wherein the organic polymer material is subjected to a conductive treatment by adding a multi-walled carbon nanotube pre-dispersion.
5. the method for coating an organic polymer material according to claim 1, wherein in the step (1), when the organic polymer material has a flat plate structure, the flat plate-like organic polymer material is cleaned and coated with a conductive coating material to obtain a conductive organic polymer material;
when the organic polymer material is in a special-shaped structure, the organic polymer material and the conductive additive are mixed, injected or extruded to form, and the conductive organic polymer material is obtained.
6. The coating method of the organic polymer material according to claim 5, wherein the conductive coating comprises a cured coating and a multi-walled carbon nanotube pre-dispersion, and the addition amount of the multi-walled carbon nanotube pre-dispersion in the conductive coating is 0.1-5%;
The conductive additive is a multi-walled carbon nanotube pre-dispersion body, and the addition amount of the conductive additive in the conductive organic high polymer material is 0.1-5%.
7. the method of coating an organic polymer material according to claim 1, wherein the temperature of the preheating treatment in the step (2) is 40 to 60 ℃ for 1 to 10 minutes.
8. The method for coating an organic polymer material according to claim 1, wherein in the step (3), the powder coating is uniformly applied to the surface of the organic polymer material by electrostatic spraying.
9. The method for coating an organic polymer material according to claim 8, wherein in the step (3), the organic polymer material is coated once with a powder coating material, and the powder coating material is an ultra-low temperature powder coating material.
10. the method for coating an organic polymer material according to claim 8, wherein in the step (3), the organic polymer material is coated with the powder coating material a plurality of times, first coated with the ultra-low temperature powder coating material, and then coated with the conductive ultra-low temperature powder coating material another number of times.
11. A method of coating an organic polymer material according to claim 10, wherein the conductive ultra-low temperature powder coating comprises 95-99.9% ultra-low temperature powder coating and 0.1-5% multi-walled carbon nanotube pre-dispersion, and the surface resistivity thereof is 10E4-10E8 ohm/sq.
12. a coating method of an organic polymer material according to claim 9, 10 or 11, wherein the glass transition temperature of the ultra-low temperature powder coating is 40 to 55 ℃, the gelling time is 50 to 150s at 110 ℃, the curing temperature is 90 to 130 ℃, the curing time is 2 to 10min, and the spray particle size is 5 to 25 μm.
13. A method for coating an organic polymer material according to claim 12, wherein the ultra-low temperature powder coating is prepared by the following method:
(A) mixing polyester resin and auxiliary materials, extruding into sheets to obtain polyester sheet-shaped objects;
(B) mixing and extruding epoxy resin and auxiliary materials into sheets to obtain epoxy resin sheet-shaped objects;
(C) mixing the polyester sheet material in the step (A) and the epoxy resin sheet material in the step (B) in proportion, and crushing the mixture to 25-60 mu m to obtain first powder material;
(D) crushing the first powder in the step (C) to 3-35 mu m, and grading to obtain a second powder of 5-25 mu m;
(E) Crushing the auxiliary agent to 1-9 mu m to obtain third powder;
(F) mixing the second powder material obtained in the step (D) with the third powder material obtained in the step (E) in proportion.
14. The method for coating an organic polymer material according to claim 13, wherein the ratio of the polyester sheet-like material in the step (A) to the epoxy resin sheet-like material in the step (B) is (1-3): (1-3) mixing;
The second powder material of the step (D) and the third powder material of the step (E) are mixed according to the ratio of (70-100): (1-15) mixing.
15. A coating method of an organic polymer material according to claim 13, wherein the auxiliary agent comprises one or more of a catalyst, an anti-sticking agent, an antifoaming agent, and a multi-walled carbon nanotube pre-dispersion;
wherein the defoaming agent is a fluorine-containing surfactant or polyethylene wax with the melting point lower than 80 ℃;
the anti-sticking agent is one or a combination of nano inorganic filler, nano fumed silica and nano fumed alumina, and the nano inorganic filler is one or a combination of nano silicon nitride, nano calcium carbonate, nano zirconium oxide and nano aluminum hydroxide.
16. a method for coating an organic polymer material according to claim 13, wherein in the step (C), the polyester sheet and the epoxy resin sheet are pulverized to 25 to 60 μm by a millstone jet mill;
In the step (D), the first powder is airflow-pulverized to 3-35 μm by a supersonic fluidized bed;
In the step (E), the auxiliary agent is airflow-pulverized to 1-9 μm by using a supersonic fluidized bed.
17. The method for coating an organic polymer material according to claim 1, further comprising, after the step (4) and before the step (5):
and decorating the cured organic polymer material.
18. a coating method of an organic polymer material according to claim 17, wherein the decoration treatment is any one of the following steps:
Carrying out ink-jet printing on the powder coating on the surface of the organic polymer material;
polishing the powder coating on the surface of the organic polymer material;
coating the powder coating on the surface of the organic polymer material with water-based paint;
and polishing the powder coating on the surface of the organic polymer material.
19. an organic polymer material produced by the coating method according to any one of claims 1 to 18.
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