CN107987598B - Reflective heat-insulating coating for high-speed railway ballastless track plate and preparation method thereof - Google Patents
Reflective heat-insulating coating for high-speed railway ballastless track plate and preparation method thereof Download PDFInfo
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- CN107987598B CN107987598B CN201711496546.0A CN201711496546A CN107987598B CN 107987598 B CN107987598 B CN 107987598B CN 201711496546 A CN201711496546 A CN 201711496546A CN 107987598 B CN107987598 B CN 107987598B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- 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
- C09D127/16—Homopolymers or copolymers of vinylidene fluoride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
- C08L2205/20—Hollow spheres
Abstract
The invention provides a reflective heat-insulating coating suitable for coating a ballastless track plate of a high-speed railway and a preparation method of the reflective heat-insulating coating. The composite material comprises, by weight, 30-60 parts of water-based fluorocarbon latex, 1-25 parts of acrylate latex, 5-35 parts of titanium dioxide filler with the particle size of 200 nm-2 microns, 3-15 parts of hollow glass microspheres with the particle size of 10 microns-100 microns, 1-8 parts of hollow polymer/titanium dioxide composite microspheres with the surface modified by coating titanium dioxide and the particle size of 150 nm-500 nm, 0.1-3 parts of a light conversion material with a down-conversion fluorescence effect, and 3-10 parts of a leveling agent, an antifoaming agent, a wetting dispersant, a thixotropic agent, a thickening agent and a pigment. The invention improves the cooling effect of the obtained coating by utilizing the reflection, heat insulation and light conversion functions of various fillers and the synergistic effect among the fillers.
Description
Technical Field
The invention belongs to the technical field of reflective heat-insulating coatings, and particularly relates to a reflective heat-insulating coating suitable for coating a ballastless track plate of a high-speed railway and a preparation method thereof.
Background
The slab ballastless track structure is a main track structure type adopted by the construction of high-speed railways in China. Due to the large plane size of the track slab, the influence of the external environment, particularly sunlight irradiation, is large. This results in the formation of a temperature gradient that changes repeatedly within the track slab, causing a certain degree of temperature deformation of the track slab, affecting its service life. The reflective heat-insulating coating is coated on the surface of the ballastless track plate, which is one of effective ways for reducing the temperature of the track plate and relieving the temperature gradient change of the track plate.
The research on reflective insulation coatings began earlier, and the reflective insulation technology has been greatly advanced in the late 70's of the 20 th century. Then, various coating materials for reducing the temperature of the coated object under the irradiation of sunlight have been actively studied. John w.good et al found that the temperature in the test chamber coated with the reflective coating was much lower than the temperature in the test chamber not coated with the reflective coating. Kang et al added hollow titanium dioxide microspheres to a polyacrylate coating and found that the coating thermal conductivity was lowest when the hollow sphere wall thickness was 43 nm. In recent years, composite thermal insulation coatings which simultaneously act on multiple thermal insulation mechanisms gradually appear, have the functions of blocking and reflecting, can actively radiate heat outwards, and have become the development trend of reflective thermal insulation coatings. At present, the reflective heat insulation coating has been successfully applied to the fields of aerospace, building, petrifaction, military, industry and the like, and the remarkable energy-saving effect of the reflective heat insulation coating has been widely accepted in the industry. Representative products, such as the energy-saving coating of the U.S. shield (Thermo-shield), have been successfully applied to the thermal insulation coating of space shuttles.
The reflective heat-insulating coating generally comprises matrix resin, functional pigment and filler and various film-forming assistants. Wherein, the functional pigment and filler plays a key role in realizing the cooling effect of the coating. If a good cooling effect of the coating is desired, the fillers used must have a high refractive index and a high near-infrared reflectivity. Meanwhile, hollow glass beads or ceramic beads are often added into the coating as auxiliary heat insulation fillers. The hollow micro-beads are closely arranged in the coating, so that heat conduction can be effectively prevented. The invention patent CN 103937314B discloses a preparation method of a slurry special for modified floating beads and the slurry special for modified floating beads, wherein fly ash floating beads are used for replacing ceramic hollow microspheres, and a titanium dioxide spraying process is adopted, so that the color problem of the floating beads is solved, and the obtained coating has good economical efficiency and has the functions of heat insulation and reflected light heat. The invention patent CN 104830139B discloses a green porous near-infrared reflection pigment and a preparation method thereof, and the obtained pigment has a porous structure, good near-infrared reflection capability and good comprehensive heat insulation performance.
The current high-performance reflective heat-insulating coating is mainly white coating with high brightness and higher glossiness. When the coating is applied to the ballastless track plate for cooling, the visual judgment of a locomotive driver on the line condition is easily influenced, so that the application limitation is obvious. However, the effect of the low-lightness reflective heat-insulating coating cannot well meet the requirement of cooling the ballastless track plate at present. Moreover, if conventional technical means such as increasing the content of hollow microspheres in the coating are adopted to realize lower coating thermal conductivity, the mechanical property of the coating is often remarkably reduced, so that the coating is difficult to meet the application requirements. Therefore, only when relatively low brightness, glossiness and suitable mechanical property of the coating are kept, the cooling effect of the reflective heat-insulating coating is further improved by adopting a suitable technical means, and the reflective heat-insulating coating is suitable for cooling coating of the ballastless track plate.
Disclosure of Invention
The invention aims to solve the problems and provides a reflective heat-insulating coating suitable for coating a ballastless track plate of a high-speed railway and a preparation method of the reflective heat-insulating coating.
The reflective heat-insulating coating suitable for coating the high-speed railway ballastless track plate is characterized by comprising 30-60 parts by weight of water-based fluorocarbon latex, 1-25 parts by weight of acrylate latex, 5-35 parts by weight of titanium dioxide filler with the particle size of 200 nm-2 microns, 3-15 parts by weight of hollow glass microspheres with the particle size of 10 microns-100 microns, 1-8 parts by weight of hollow polymer/titanium dioxide composite microspheres with the surface modified by coating of titanium dioxide and the particle size of 150 nm-500 nm, 0.1-3 parts by weight of a light conversion material with down-conversion fluorescence effect, and 3-10 parts by weight of a flatting agent, an antifoaming agent, a wetting dispersant, a thixotropic agent, a thickening agent and a pigment.
The water-based fluorocarbon latex is prepared by copolymerizing vinylidene fluoride monomers and acrylic monomers, the content of fluorine in the obtained latex particles is more than 16%, the particle size of the latex particles is between 100 and 500nm, and the lowest film-forming temperature of the obtained latex is less than or equal to 32 ℃.
The nano titanium dioxide filler is rutile titanium dioxide.
The hollow glass beads are preferably glass beads of model VS5500 from 3M company.
The hollow polymer/titanium dioxide composite microsphere is composed of a cavity/a polymer layer/a titanium dioxide layer, wherein the diameter of the cavity is 50-400 nm, the thickness of the polymer layer is 20-100 nm, and the thickness of the titanium dioxide layer is 20-100 nm.
The light conversion material has a down-conversion fluorescence effect of converting ultraviolet light and visible light into infrared light of 8-13.5 mu m, and the quantum yield is more than 0.8.
The pigment is a cold pigment.
The brightness value of the coating obtained after the coating is used for coating the surface of the track slab is lower than 82 and is 60OThe gloss values of the angle test are below 20.
The invention relates to a preparation method of a reflective heat-insulating coating suitable for coating a ballastless track plate of a high-speed railway, which is characterized by comprising the following steps of:
(1) adding quantitative water, a flatting agent, a defoaming agent, a wetting dispersant, a pigment, a light conversion material, titanium dioxide filler and hollow composite microspheres into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 mu m to obtain color paste;
(2) adding quantitative water-based fluorocarbon latex, acrylate latex, thixotropic agent, thickening agent, hollow glass beads and color paste into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
The reflective heat-insulating coating suitable for coating the ballastless track plate of the high-speed railway has the positive effects that:
the proper compounding of the aqueous fluorocarbon latex and the acrylic latex provides better mechanical property and weather resistance of the coating and good adhesive force with the surface of the track slab. The titanium dioxide filler mainly plays a role in reflecting and shielding solar radiation in the coating. The hollow glass beads have the effects of reflecting solar radiation and increasing the thermal resistance of the coating in the coating. The hollow polymer/titanium dioxide composite microspheres are matched with the titanium dioxide filler and the hollow glass beads in particle size distribution, so that the filler in the coating is more tightly stacked, the hollow structure in the coating is increased, and the thermal resistance of the coating is improved. On the other hand, compared with the common hollow polymer microsphere, the titanium dioxide layer on the surface of the hollow polymer/titanium dioxide composite microsphere improves the reflection capacity to solar radiation and the compressive capacity of the microsphere; compared with the common titanium dioxide hollow microspheres, the preparation process of the hollow polymer/titanium dioxide composite microspheres is relatively simple, the integrity of the microspheres is good, and the microspheres are not easy to break in the preparation process of the coating. The ultraviolet light and the visible light are converted into 8-13.5 mu m infrared light by using the light conversion material with a proper proportion under the condition of no obvious temperature increasing effect, more energy is radiated to an outer space by utilizing an atmospheric infrared window, and the surface temperature of the coating is reduced. Because of the synergistic effect of the fillers, when the fillers are compounded in a proper proportion, the performance of the obtained coating is better than the effect of singly increasing the dosage of one filler.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in parts by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 2:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylic latex, 15 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 3:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 25 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 4:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 15 parts
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 5:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
4 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 6:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
8 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 7:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion material, 0.1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 8:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 3 parts
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 9:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 10 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in parts by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Example 10:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 9 parts
3 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in parts by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 1:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylic ester latex, 30 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 2:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
50 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 3:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
Titanium dioxide filler, 0 part
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 4:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 0 part
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 5:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
20 portions of hollow glass beads
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 6:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
0 portion of hollow polymer/titanium dioxide composite microsphere
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 7:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
10 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion Material, 1 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 8:
the coating comprises the following raw materials in parts by weight:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion material, 0 part
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Comparative example 9:
50 portions of aqueous fluorocarbon latex
Acrylate latex, 5 parts
20 portions of titanium dioxide filler
Hollow glass bead, 8 portions
2 portions of hollow polymer/titanium dioxide composite microspheres
Light conversion material, 5 parts
0.5 part of leveling agent
0.5 portion of defoaming agent
Wetting dispersant, 0.5 part
Thixotropic agent, 0.5 part
0.5 part of thickening agent
0.5 part of pigment
The preparation steps comprise:
(1) adding the flatting agent, the defoaming agent, the wetting dispersant, the pigment, the light conversion material, the titanium dioxide filler, the hollow composite microspheres and a certain amount of water in parts by weight into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 micrometers to obtain color paste;
(2) and adding the aqueous fluorocarbon latex, the acrylate latex, the thixotropic agent, the thickening agent, the hollow glass beads and the color paste in percentage by weight into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
Description of the effects:
the specific characterization method comprises the following steps:
(1) tensile strength and elongation at break were tested according to the standard GB/T16777-2008, section 9.
(2) The insulation temperature difference is tested by adopting self-made equipment according to the relevant contents in the standard HG/T4341-2012.
(3) The coating lightness, solar reflectance and hemispherical emissivity were tested with reference to the relevant contents in the standard JG/T235-2014.
(4) The coating gloss is tested by using a single-angle gloss meter according to the standard GB/T9754-2007, and the test angle is 60 degrees.
(5) The treatment modes in the durability test include UV treatment, acid solution treatment, alkali solution treatment, and salt solution treatment.
From the results of example 1 and comparative example 1, it can be seen that the acrylate latex added in comparative example 1 is too large, the coating durability is reduced, the durability test is not passed, and the elongation at break is too high, increasing the risk of peeling off the coating;
from the results of example 1 and comparative example 2, it can be seen that the amount of titanium dioxide filler added in comparative example 2 is too large and the elongation at break of the coating is too low;
as can be seen from the results of the example 1 and the comparative example 3, the reflective heat insulation effect of the coating is obviously reduced because no titanium dioxide filler is added in the comparative example 3;
from the results of example 1 and comparative example 4, it can be seen that the insulating temperature difference of the coating is reduced without adding hollow glass beads in comparative example 4;
from the results of example 1 and comparative example 5, it can be seen that the amount of hollow glass microspheres added in comparative example 5 is too large, and the elongation at break of the coating is too low;
as can be seen from the results of example 1 and comparative example 6, the hollow polymer/titanium dioxide composite microspheres are not added in comparative example 6, and the heat insulation temperature difference of the coating is reduced;
from the results of the example 1 and the comparative example 7, it can be known that the amount of the hollow polymer/titanium dioxide composite microspheres added in the comparative example 7 is too large, and the heat insulation temperature difference of the coating is reduced;
from the results of example 1 and comparative example 8, it can be seen that the coating has a reduced insulating temperature difference without adding a light conversion material in comparative example 8;
from the results of the embodiment 1 and the comparative example 9, it can be known that the amount of the light conversion material added in the comparative example 9 is too large, the temperature increasing effect caused by the heat effect of the light conversion material is higher than the temperature reducing effect caused by the light conversion effect, and the heat insulation temperature difference of the coating is reduced;
in conclusion, the coating can meet the requirements in all aspects within the formula range claimed by the invention. When the formulation is outside the scope of the claimed invention, there will be a significant reduction in several properties of the coating.
Claims (9)
1. The reflective heat-insulating coating suitable for coating the ballastless track plate of the high-speed railway is characterized by comprising 30-60 parts by weight of aqueous fluorocarbon latex, 1-25 parts by weight of acrylate latex, 5-35 parts by weight of titanium dioxide filler with the particle size of 200 nm-2 microns, 3-15 parts by weight of hollow glass microspheres with the particle size of 10 microns-100 microns, 1-8 parts by weight of hollow polymer/titanium dioxide composite microspheres with the surface modified by coating of titanium dioxide and the particle size of 150 nm-500 nm, 0.1-3 parts by weight of a light conversion material with a down-conversion fluorescence effect, and 3-10 parts by weight of a leveling agent, a defoaming agent, a wetting dispersant, a thixotropic agent, a thickening agent and a pigment.
2. The reflective heat-insulating coating suitable for coating the ballastless track plate of the high-speed railway according to claim 1, wherein the aqueous fluorocarbon latex is prepared by copolymerizing vinylidene fluoride monomer and acrylic monomer, the content of fluorine element in the obtained latex particles is more than 16%, the particle size of the latex particles is 100-500 nm, and the lowest film-forming temperature of the obtained latex is less than or equal to 32 ℃.
3. The reflective insulation coating suitable for coating the ballastless track plate of the high-speed railway according to claim 1, wherein the titanium dioxide filler is rutile type titanium dioxide.
4. The reflective insulation coating suitable for coating the ballastless track plate of the high-speed railway according to claim 1, wherein the hollow glass beads are glass beads of model VS5500 of 3M company.
5. The reflective insulation coating suitable for coating the ballastless track plate of the high-speed railway according to claim 1, wherein the hollow polymer/titanium dioxide composite microspheres consist of a cavity/a polymer layer/a titanium dioxide layer, wherein the diameter of the cavity is 50-400 nm, the thickness of the polymer layer is 20-100 nm, and the thickness of the titanium dioxide layer is 20-100 nm.
6. The reflective insulation coating suitable for coating the ballastless track plate of the high-speed railway according to claim 1, wherein the light conversion material has a down-conversion fluorescence effect of converting ultraviolet light and visible light into infrared light of 8-13.5 μm, and the quantum yield is greater than 0.8.
7. The reflective insulation coating suitable for coating the ballastless track plate of the high-speed railway according to claim 1, wherein the pigment is a cold pigment.
8. The reflective thermal insulation coating suitable for coating the ballastless track plate of the high-speed railway according to claim 1, wherein the brightness value of the coating obtained after the coating is used for coating the surface of the track plate is lower than 82 and is 60 degrees centigradeOThe gloss values of the angle test are below 20.
9. The preparation method of the reflective heat-insulating coating suitable for coating the ballastless track plate of the high-speed railway according to any one of claims 1 to 8, characterized by comprising the following steps:
(1) adding a certain amount of water, a leveling agent, a defoaming agent, a wetting dispersant, a pigment, a light conversion material, a titanium dioxide filler and hollow polymer/titanium dioxide composite microspheres into a high-speed dispersion kettle, and stirring and dispersing until the fineness is less than or equal to 30 mu m to obtain color paste;
(2) adding quantitative water-based fluorocarbon latex, acrylate latex, thixotropic agent, thickening agent, hollow glass beads and color paste into a dispersion kettle, and uniformly stirring and mixing to obtain the required coating.
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| WO2024059567A1 (en) * | 2022-09-14 | 2024-03-21 | Raytheon Company | Water-based acrylic latex paint transmissive in the nir and swir bands |
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| CN111909577B (en) * | 2020-07-03 | 2022-03-08 | 中山市蓝德环保节能工程有限公司 | Heat insulation coating and preparation method thereof |
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