CN111635662A - Carbon nitride modified organic powder coating and preparation method and application thereof - Google Patents
Carbon nitride modified organic powder coating and preparation method and application thereof Download PDFInfo
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- CN111635662A CN111635662A CN202010638890.4A CN202010638890A CN111635662A CN 111635662 A CN111635662 A CN 111635662A CN 202010638890 A CN202010638890 A CN 202010638890A CN 111635662 A CN111635662 A CN 111635662A
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- carbon nitride
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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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- 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
- B05D3/02—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 by baking
- B05D3/0254—After-treatment
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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
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive 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
- C09D5/32—Radiation-absorbing paints
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses a carbon nitride modified organic powder coating, a preparation method and application thereof, wherein the carbon nitride modified organic powder coating takes graphite-like phase carbon nitride as a filler or an auxiliary agent of the organic powder coating, and the mass percentage concentration of the graphite-like phase carbon nitride in the organic powder coating is 0.8-9.0%. The preparation method comprises the following steps: (1) synthesizing graphite-like phase carbon nitride; (2) and preparing the carbon nitride modified organic powder coating. The application of the carbon nitride modified organic powder coating is that the carbon nitride modified organic powder coating is sprayed by a dry spraying method and is cured for 20-60min at the temperature of 150 ℃ and 200 ℃ to obtain a coating film. The carbon nitride modified organic powder coating can greatly enhance the physical properties of hardness, rigidity, wear resistance and scratch resistance of a coating film; the strength and the corrosion resistance of the resin are improved; the weather resistance and the anti-aging effect of the coating are improved.
Description
Technical Field
The invention belongs to the field of powder coating, and particularly relates to carbon nitride modified organic powder coating as well as a preparation method and application thereof.
Background
Powder coatings are generally composed of resins, curing agents, pigments, fillers, auxiliaries and the like. Powder coatings are largely divided into thermoplastic powder coatings and thermosetting powder coatings, and are largely classified according to the type of film-forming resin. The thermoplastic powder coating is mainly of polyethylene, polyvinyl chloride, polyamide, polyphenylene sulfide, polyvinyl fluoride and other powder varieties, and the thermosetting powder coating is mainly of epoxy, epoxy-polyester, polyurethane and other powder varieties. The filler plays a role in the powder coating, mainly plays a role in increasing the hardness and rigidity of a coating film, and can also reduce the cost of the coating. The filler used in powder coating is precipitated barium sulfate, barite powder, light calcium carbonate, heavy calcium carbonate, kaolin, talcum powder, bentonite, precipitated silica, mica powder, quartz powder, etc. The existing organic powder coating market has the problems that the corrosion resistance and the weather resistance can not be obtained at the same time, the mechanical properties such as hardness, impact strength, wear resistance and the like required during installation, transportation and operation are poor, and the cost is very high.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a carbon nitride modified organic powder coating, a preparation method and application thereof, and the preparation method has the advantages of abundant raw materials, easy processing, excellent performance and low cost.
In order to achieve the purpose, the invention provides a carbon nitride modified organic powder coating, which comprises graphite-like phase carbon nitride serving as a filler or an auxiliary agent of the organic powder coating.
Preferably, the mass percentage concentration of the graphite-like phase carbon nitride in the organic powder coating is 0.8-9.0%.
Further, the paint also comprises epoxy resin, and the mass percentage concentration of the epoxy resin in the organic powder paint is 40-60%.
Further, the coating also comprises a curing agent, wherein the mass percentage concentration of the curing agent in the organic powder coating is 2-20%.
The invention also provides a preparation method of the carbon nitride modified organic powder coating, which comprises the following steps:
(1) synthesizing graphite-like phase carbon nitride, namely placing a nitrogen heterocyclic organic matter in a temperature heater, heating to the temperature of 450-600 ℃, and then keeping for 20-60min to prepare bulk phase carbon nitride bulk carbon nitride, wherein the prepared bulk phase carbon nitride bulk carbon nitride is treated in an ultrasonic, oxygen stripping or hydrothermal treatment mode to obtain graphite-like phase carbon nitride;
(2) and (2) preparing the carbon nitride modified organic powder coating, namely premixing the graphite-like phase carbon nitride obtained in the step (1) as a filler or an auxiliary agent with other components of the organic powder coating at the temperature of 145 ℃ under 115 ℃, continuously melting, mixing, uniformly dispersing and extruding the mixture, and then cooling, crushing and sieving the mixture in a grading manner to obtain the carbon nitride modified organic powder coating.
Preferably, the mass percentage concentration of the graphite-like phase carbon nitride in the organic powder coating is 0.8-9.0%.
The invention also provides application of the carbon nitride modified organic powder coating, wherein the carbon nitride modified organic powder coating is sprayed on the surface of equipment by a dry spraying method, and is heated and cured for 20-60min at the temperature of 150-.
The carbon nitride modified organic powder coating and the preparation method and the application thereof provided by the invention have the following beneficial effects:
1. the carbon nitride is used as a filler, has rich raw materials, simple preparation and low cost, and can play a role in reducing the price of the coating;
2. carbon nitride is used as the hardest material known at present in the world, theoretically exceeds diamond, and is added into the coating as a filler, so that the physical properties of hardness, rigidity, wear resistance and scratch resistance of the coating can be greatly enhanced;
3. the surface of graphite-phase carbon nitride generated by pyrolysis is rich in amino or carboxyl bonds, and can be bonded with resin better than fumed silica and the like, so that the strength and the corrosion resistance of the resin are improved;
4. the carbon nitride has extremely high chemical stability, and the graphite-like phase carbon nitride nanosheets can play a role in supporting and supplementing corrosion resistance and chemical resistance of the coating in a resin gap network;
5. the graphite-phase carbon nitride has the characteristic of small band gap, can absorb 200-500nm ultraviolet light and partial visible light, and improves the weather resistance and the ageing resistance of the coating.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the technical field better understand the scheme of the present invention.
A carbon nitride modified organic powder paint is prepared from graphite-like carbon nitride as filler or assistant in thermoplastic or thermosetting powder paint (0.8-9.0 wt.%), and features that the original filler or assistant is not used or reduced, such as titanium dioxide.
A process for preparing the organic powder paint modified by carbon nitride as filler or assistant is disclosed, which can be used for preparing all kinds of organic powder paint, including thermoplastic powder paint and thermosetting powder paint.
Carbon nitride (C)3N4) The composite material is the hardest known substance in the world at present, has the advantages of large specific surface area, low density, high chemical stability, strong wear resistance and the like, and is applied to the fields of high-performance wear-resistant material coatings, film materials and the like. The graphite-like phase carbon nitride is used as an organic powder filler or an auxiliary agent, and the graphite-like phase carbon nitride is used as the filler or the auxiliary agent, so that the corrosion resistance, the weather resistance and the mechanical property of the organic powder coating can be effectively improved.
The preparation method of the organic powder coating modified by carbon nitride as the filler or the additive comprises the following steps:
(1) synthesizing graphite-like phase carbon nitride, namely putting nitrogen heterocyclic organic matters such as urea, dicyandiamide or melamine and the like into a temperature heater such as a muffle furnace or a curing furnace and the like, heating to 450-phase 600 ℃, and keeping for 20min-1h to prepare bulk phase carbon nitride bulk carbon nitride, wherein the bulk phase carbon nitride bulk carbon nitride is a substance which presents a multilayer graphite-like phase carbon nitride nanosheet structure and is stacked by Van der Waals force; then, the bulk-phase carbon nitride bulk carbon nitride is subjected to ultrasonic or oxygen stripping and the like to prepare graphite-like phase carbon nitride nanosheets, or is subjected to hydrothermal treatment at different temperatures by different solvents to prepare linear or columnar graphite-like phase carbon nitride.
(2) Preparing an organic powder coating modified by graphite-like phase carbon nitride, namely mixing the graphite-like phase carbon nitride obtained in the step (1) as a filler or an auxiliary agent into an organic powder coating formula through a high-speed mixer in a premixing stage of the organic powder coating, wherein the mass percentage concentration of the graphite-like phase carbon nitride in the thermoplastic powder coating or the thermosetting powder coating is 0.8-9.0%, and the original filler or auxiliary agent can be properly reduced or not used, such as titanium dioxide as the filler or the auxiliary agent; after the organic powder coating is premixed, the organic powder coating is conveyed to a melt extrusion mixer through a feeder, various components in the organic powder coating are melted, mixed and uniformly dispersed at 130 ℃, and then the extruded material is cooled, crushed and sieved in a grading way to obtain the organic powder coating with different particle sizes.
The carbon nitride modified organic powder coating is mainly sprayed by a dry spraying method such as electrostatic spraying or fluidized bed dip coating, and is cured for 20min-1h at the temperature of 150 ℃ and 200 ℃ to obtain a coating film which is used in various places.
Example 1
The carbon nitride modified organic powder coating uses graphite-like phase carbon nitride as a filler or an auxiliary agent of the organic powder coating, the mass percentage concentration of the graphite-like phase carbon nitride in the thermoplastic powder coating or the thermosetting powder coating is 0.8-9.0%, the mass percentage concentration of bisphenol S type epoxy resin in the organic powder coating is 40-60 wt%, the mass percentage concentration of a curing agent is 2-20 wt%, the mass percentage concentration of the filler is 10-25 wt%, and when the added content of the graphite-like phase carbon nitride is more, the original filler or auxiliary agent can be reduced or not used in a proper amount, such as titanium dioxide or silicon dioxide and the like used as the filler or auxiliary agent, benzoic acid used as the auxiliary agent, and carbon black used as a pigment.
The carbon nitride is used as a filler, has rich raw materials, simple preparation and low cost, and can play a role in reducing the price of the coating;
carbon nitride is used as the hardest material known at present in the world, theoretically exceeds diamond, and is added into the coating as a filler, so that the physical properties of hardness, rigidity, wear resistance and scratch resistance of the coating can be greatly enhanced;
the surface of graphite-phase carbon nitride generated by pyrolysis is rich in amino or carboxyl bonds, and can be bonded with resin better than fumed silica and the like, so that the strength and the corrosion resistance of the resin are improved;
the carbon nitride has extremely high chemical stability, and the graphite-like phase carbon nitride nanosheets can play a role in supporting and supplementing corrosion resistance and chemical resistance of the coating in a resin gap network;
the graphite-phase carbon nitride has the characteristic of small band gap, can absorb 200-500nm ultraviolet light and partial visible light, and improves the weather resistance and the ageing resistance of the coating.
The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. The carbon nitride modified organic powder coating is characterized by comprising graphite-like phase carbon nitride which is used as a filler or an auxiliary agent of the organic powder coating.
2. The carbon nitride modified organic powder coating of claim 1, wherein the concentration of the graphite-like phase carbon nitride in the organic powder coating is 0.8-9.0% by mass.
3. The carbon nitride modified organic powder coating of claim 1, further comprising an epoxy resin, wherein the concentration of the epoxy resin in the organic powder coating is 40-60% by mass.
4. The carbon nitride modified organic powder coating of claim 1, further comprising a curing agent, wherein the curing agent is present in the organic powder coating at a concentration of 2% to 20% by weight.
5. The method of preparing a carbon nitride modified organic powder coating of any one of claims 1 to 4, comprising the steps of:
(1) synthesizing graphite-like phase carbon nitride, namely placing a nitrogen heterocyclic organic matter in a temperature heater, heating to the temperature of 450-600 ℃, and then keeping for 20-60min to prepare bulk phase carbon nitride bulk carbon nitride, wherein the prepared bulk phase carbon nitride bulk carbon nitride is treated in an ultrasonic, oxygen stripping or hydrothermal treatment mode to obtain graphite-like phase carbon nitride;
(2) and (2) preparing the carbon nitride modified organic powder coating, namely premixing the graphite-like phase carbon nitride obtained in the step (1) as a filler or an auxiliary agent with other components of the organic powder coating at the temperature of 145 ℃ under 115 ℃, continuously melting, mixing, uniformly dispersing and extruding the mixture, and then cooling, crushing and sieving the mixture in a grading manner to obtain the carbon nitride modified organic powder coating.
6. The preparation method according to claim 5, wherein in the step (2), the mass percentage concentration of the graphite-like phase carbon nitride in the organic powder coating is 0.8% -9.0%.
7. The use of the carbon nitride modified organic powder coating as claimed in any one of claims 1 to 4, wherein the carbon nitride modified organic powder coating is sprayed on the surface of the device by a dry spraying method, and is cured by heating at 150-200 ℃ for 20-60min until a coating film is formed on the surface of the device.
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| CN202010638890.4A CN111635662A (en) | 2020-07-06 | 2020-07-06 | Carbon nitride modified organic powder coating and preparation method and application thereof |
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| CN202010638890.4A CN111635662A (en) | 2020-07-06 | 2020-07-06 | Carbon nitride modified organic powder coating and preparation method and application thereof |
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Cited By (1)
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| CN114133777A (en) * | 2021-11-01 | 2022-03-04 | 美典电子新材料科技镇江有限公司 | High-performance low-temperature curing powder coating additive, preparation process and spraying method |
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| CN114133777A (en) * | 2021-11-01 | 2022-03-04 | 美典电子新材料科技镇江有限公司 | High-performance low-temperature curing powder coating additive, preparation process and spraying method |
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