CN110804374B - Preparation method of light-reflecting self-cleaning coating - Google Patents

Preparation method of light-reflecting self-cleaning coating Download PDF

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CN110804374B
CN110804374B CN201911099203.XA CN201911099203A CN110804374B CN 110804374 B CN110804374 B CN 110804374B CN 201911099203 A CN201911099203 A CN 201911099203A CN 110804374 B CN110804374 B CN 110804374B
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coating
light
self
microspheres
polytetrafluoroethylene
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CN110804374A (en
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崔大祥
陈超
王敬锋
林琳
金彩虹
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Shanghai National Engineering Research Center for Nanotechnology Co Ltd
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Shanghai National Engineering Research Center for Nanotechnology Co Ltd
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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
    • 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
    • B05D7/14—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 metal, e.g. car bodies
    • 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
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
    • 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
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
    • 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
    • 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
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • 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
    • 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
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • 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
    • B05D2504/00—Epoxy polymers
    • 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
    • B05D2506/00—Halogenated polymers
    • B05D2506/10—Fluorinated polymers
    • B05D2506/15—Polytetrafluoroethylene [PTFE]
    • 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
    • B05D2508/00—Polyesters

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention discloses a preparation method of a light-reflecting self-cleaning coating. On the basis of a conventional powder coating process, larger-particle polytetrafluoroethylene microspheres are added as a surface modification layer, the light reflection effect is caused by the unevenness of particles on the surface of the coating, and then a layer of microspheres of polytetrafluoroethylene and titanium dioxide with smaller particle sizes is coated, so that the double-hydrophobic effect of the polytetrafluoroethylene and the self-cleaning function of the titanium dioxide are fully utilized, and the light reflection and self-cleaning of the coating are realized.

Description

Preparation method of light-reflecting self-cleaning coating
Technical Field
The invention belongs to the technical field of outdoor polymers, and particularly relates to a preparation method of a light-reflecting self-cleaning coating.
Background
With the great advance of capital construction in our country in recent years, reflective coatings are needed in more and more outdoor places, such as traffic sign lines, raised road signs, contour signs, traffic cones, crash cans and other various road traffic safety facilities, as well as automobile license plates, fire fighting, railways, water transportation, mine areas and the like, and can be divided into traffic sign reflective materials, road sign reflective materials, raised road signs, contour sign reflective materials and the like, so that the demand is huge.
As a weather-resistant coating suitable for outdoor use situations, the powder reflective coating is more and more popular in the market, but along with the continuous aggravation of environmental pollution, the more and more serious haze, oily smog, tail gas and waste gas and the like bring serious erosion to outdoor marks, and the attractiveness, functionality and durability of the powder reflective coating are influenced. Poor stain resistance is a common disadvantage of traditional outdoor coatings, and limits the application of the coatings to a certain extent. Therefore, there is a need to develop a powder light-reflecting coating with a self-cleaning function.
Polytetrafluoroethylene becomes a resin with double-hydrophobic ability because of having lower surface energy, and the size titanium dioxide microsphere with self-cleaning ability is supplemented after preparing the microsphere with certain particle size, and the prepared microsphere is added into the traditional powder coating together, and the matching of the size particles on the surface layer of the coating realizes the coarse surface with micron size, thereby being beneficial to realizing large hydrophobic angle, being capable of washing with the help of natural conditions such as rainwater and the like to keep the surface of an outdoor object clean, realizing self-cleaning, and simultaneously realizing the reflection of light on the coarse surface.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of a high-molecular coating, which realizes the light reflecting and self-cleaning functions of an outdoor coating by using polytetrafluoroethylene and titanium dioxide microspheres.
The purpose of the invention is realized by the following scheme: a preparation method of a light-reflecting self-cleaning coating is characterized in that on the basis of a conventional powder coating process, polytetrafluoroethylene microspheres with larger particles are added as a surface modification layer, the unevenness of particles on the surface of the coating is utilized to cause a light-reflecting effect, and then a layer of microspheres with smaller particle size, namely polytetrafluoroethylene and titanium dioxide, is coated, so that the double-hydrophobic effect of the polytetrafluoroethylene and the self-cleaning function of the titanium dioxide are fully utilized, and the preparation method at least comprises the following steps:
(1) preparing polyester, epoxy resin and an auxiliary agent comprising a leveling agent according to a proportion, blending and sieving to obtain a powder coating, performing electrostatic powder spraying on the powder coating on a metal panel, performing secondary electrostatic powder spraying on polytetrafluoroethylene hollow microspheres with the diameter of 300-500 microns, wherein the mass ratio of the microspheres to the powder coating is (2-20): 100, and after the spraying is finished, placing the powder coating in an oven for baking at the temperature of 260-350 ℃, and after the curing is finished, obtaining a powder coating;
(2) taking polytetrafluoroethylene hollow microspheres with the particle size of 50-100 microns, stirring and dispersing the polytetrafluoroethylene hollow microspheres, titanium dioxide microspheres and dimethyl silicone oil, wherein the mass ratio of the microspheres to the dimethyl silicone oil is (20-100): 100, and obtaining a dispersion liquid; and (2) coating the dispersion liquid on the surface of the powder coating obtained in the step (1), and blowing and drying at the temperature of 260-350 ℃ to obtain the light-reflecting self-cleaning coating.
On the basis of the scheme, the diameter of the titanium dioxide microsphere is 0.5-50 μm.
The surface water contact angle of the obtained reflective self-cleaning coating is more than 97 degrees.
On the basis of the conventional powder coating process, the invention firstly adds the polytetrafluoroethylene microspheres with larger particles as a surface modification layer, utilizes the unevenness of particles on the surface of the coating to cause the light reflection effect, and then coats a layer of microspheres with smaller particle size of polytetrafluoroethylene and titanium dioxide, fully utilizes the double-hydrophobic effect of the polytetrafluoroethylene and the self-cleaning function of the titanium dioxide, and finally realizes the light reflection and self-cleaning of the coating.
Detailed Description
The present invention is described in detail by the following specific examples, but the scope of the present invention is not limited to these examples.
Example 1:
a kind of reflecting light self-cleaning coating, on the basis of the conventional powder coating process, add polytetrafluoroethylene microballoon of larger granule as the surface finish first, utilize the unevenness of the particle on the surface of coating to cause the reflecting light effect, then cover a layer of microballoons of polytetrafluoroethylene and titanium dioxide of smaller grain size, the ones that fully utilized polytetrafluoroethylene are hydrophobic and the self-cleaning function of titanium dioxide, prepare according to the following steps:
(1) preparing polyester, epoxy resin and an auxiliary agent comprising a leveling agent according to a common coating proportion, blending and sieving to obtain a powder coating, performing electrostatic powder spraying on a metal panel by taking 100 g of the powder coating, performing secondary electrostatic powder spraying on 5 g of polytetrafluoroethylene hollow microspheres with the diameter of 350 mu m, placing the powder coating in an oven for baking at the temperature of 280 ℃ after the spraying is finished, and obtaining a powder coating after the curing is finished;
(2) stirring and dispersing 25 g of polytetrafluoroethylene microspheres and titanium dioxide microspheres with the particle size of 55 mu m and 100 g of dimethyl silicone oil, coating the dispersion on the surface of the powder coating obtained in the step (1), and drying by blowing at the temperature of 280 ℃ to obtain the light-reflecting self-cleaning coating, wherein the diameter of the used titanium dioxide microspheres is 0.5-50 mu m.
The coating measured a contact angle of 99 °.
Example 2:
a reflective self-cleaning coating, similar to example 1, prepared by the following steps:
(1) preparing polyester, epoxy resin and an auxiliary agent comprising a leveling agent according to a proportion, blending and sieving to obtain powder coating, performing electrostatic powder spraying on a metal panel by taking 100 g of the powder coating, performing secondary electrostatic powder spraying on 10 g of polytetrafluoroethylene hollow microspheres with the diameter of 400 mu m, baking in an oven at the temperature of 310 ℃ after spraying, and obtaining a powder coating after curing;
taking 50 g of polytetrafluoroethylene microspheres and titanium dioxide microspheres with the particle size of 70 mu m and 100 g of dimethyl silicone oil, stirring and dispersing, coating the dispersion liquid on the surface of the powder coating obtained in the step (1), and blowing and drying at the temperature of 310 ℃ to obtain the light-reflecting self-cleaning coating.
The coating measured a contact angle of 101 °.
Example 3:
a reflective self-cleaning coating, similar to example 1, prepared by the following steps:
(1) preparing polyester, epoxy resin and an auxiliary agent comprising a leveling agent according to a proportion, blending and sieving to obtain powder coating, performing electrostatic powder spraying on a metal panel by taking 100 g of the powder coating, performing secondary electrostatic powder spraying on 15 g of polytetrafluoroethylene hollow microspheres with the diameter of 450 mu m, placing the powder coating in an oven for baking at the temperature of 330 ℃ after the spraying is finished, and obtaining a powder coating after the curing is finished;
(2) taking 70 g of polytetrafluoroethylene microspheres and titanium dioxide microspheres with the particle size of 85 mu m and 100 g of dimethyl silicone oil, stirring and dispersing, coating the dispersion liquid on the surface of the powder coating obtained in the step (1), and drying by blowing at the temperature of 330 ℃ to obtain the light-reflecting self-cleaning coating.
The coating measured a contact angle of 104 °.

Claims (2)

1. A preparation method of a light-reflecting self-cleaning coating is characterized in that large-particle polytetrafluoroethylene hollow microspheres are added as a surface modification layer, the light-reflecting effect is caused by the unevenness of particles on the surface of the coating, and then a layer of smaller-particle-size polytetrafluoroethylene hollow microspheres and titanium dioxide microspheres are coated, so that the double-hydrophobic effect of polytetrafluoroethylene and the self-cleaning function of titanium dioxide are fully utilized, and the preparation method at least comprises the following steps:
(1) preparing polyester, epoxy resin and an auxiliary agent comprising a leveling agent according to a proportion, blending and sieving to obtain a powder coating, performing electrostatic powder spraying on the powder coating on a metal panel, performing secondary electrostatic powder spraying on polytetrafluoroethylene hollow microspheres with the diameter of 300-500 microns, wherein the mass ratio of the polytetrafluoroethylene hollow microspheres to the powder coating is (2-20): 100, placing the powder coating in an oven for baking at the temperature of 260-350 ℃ after the spraying is finished, and obtaining a powder coating after the curing is finished;
(2) taking polytetrafluoroethylene hollow microspheres with the particle size of 50-100 microns, titanium dioxide microspheres with the diameter of 0.5-50 microns and dimethyl silicone oil, stirring and dispersing, wherein the mass ratio of the sum of the two microspheres to the dimethyl silicone oil is (20-100): 100, and obtaining dispersion liquid; and (2) coating the dispersion liquid on the surface of the powder coating obtained in the step (1), and blowing and drying at the temperature of 260-350 ℃ to obtain the light-reflecting self-cleaning coating.
2. The method for preparing the light-reflecting self-cleaning coating according to claim 1, wherein the surface water contact angle of the obtained light-reflecting self-cleaning coating is more than 97 °.
CN201911099203.XA 2019-11-12 2019-11-12 Preparation method of light-reflecting self-cleaning coating Active CN110804374B (en)

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Publication number Priority date Publication date Assignee Title
CN114231883A (en) * 2021-12-07 2022-03-25 中国船舶重工集团公司第七一九研究所 Method for preparing cerium oxide/black titanium oxide ceramic coating on surface of substrate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102717560B (en) * 2012-06-13 2015-02-18 南京工业大学 Sunlight-initiated organic-inorganic composite self-cleaning coating and preparation method thereof
WO2015195433A2 (en) * 2014-06-16 2015-12-23 3M Innovative Properties Company Retroreflective articles with wash durable bead bond layers
CN107674536A (en) * 2017-11-14 2018-02-09 广西超星太阳能科技有限公司 A kind of solar panels insulating moulding coating
CN110133778A (en) * 2019-05-24 2019-08-16 浙江靓鸿新材料有限公司 A kind of reflective membrane with reflective insulation function
CN110256889A (en) * 2019-06-20 2019-09-20 深圳职业技术学院 A kind of broad-band reflective coating and light reflection device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102717560B (en) * 2012-06-13 2015-02-18 南京工业大学 Sunlight-initiated organic-inorganic composite self-cleaning coating and preparation method thereof
WO2015195433A2 (en) * 2014-06-16 2015-12-23 3M Innovative Properties Company Retroreflective articles with wash durable bead bond layers
CN107674536A (en) * 2017-11-14 2018-02-09 广西超星太阳能科技有限公司 A kind of solar panels insulating moulding coating
CN110133778A (en) * 2019-05-24 2019-08-16 浙江靓鸿新材料有限公司 A kind of reflective membrane with reflective insulation function
CN110256889A (en) * 2019-06-20 2019-09-20 深圳职业技术学院 A kind of broad-band reflective coating and light reflection device

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