Snowfield type flame-retardant coating with high reflectivity as well as preparation method and application of snowfield type flame-retardant coating

Abstract

The invention provides a snowfield flame-retardant coating with high reflectivity, which comprises a prime coating and a surface coating, the prime coating comprises the following components: aqueous polymer resin, a first pigment, an aqueous flame retardant, an aqueous dispersant, an aqueous light stabilizer, an aqueous defoaming agent, an aqueous wetting agent, a humectant and a curing agent, the surface layer coating comprises the following components: water-based polymer resin, a second pigment, a water-based dispersing agent, a water-based light stabilizer, a water-based defoaming agent, a water-based wetting agent, a humectant and a curing agent; a base material is sequentially coated with the prime paint and the surface paint to form the snowfield type flame-retardant layer. According to the preparation method disclosed by the invention, the high-whiteness pigment and the high-ultraviolet-reflectivity pigment are compounded, so that the requirements on the whiteness of the camouflage color and the spectral reflection characteristic of 300-760nm under the snowfield background can be met; through compounding of the flame retardant and the light stabilizer, the coating has high flame retardance and excellent aging resistance, and the prepared coating does not contain harmful substances such as organic solvents.

Description

Technical Field

[0001] The invention belongs to the technical field of functional coatings, and in particular relates to a snow-type flame-retardant coating with high reflectivity, a preparation method and an application thereof. Background Art

[0002] Snow is a background environment with high whiteness and high visible light-UV reflectivity. According to GJB7927-2012, the whiteness of white camouflage color is ≥90, the spectral reflectivity at 350nm is ≥70%, and the average spectral reflectivity in the visible light band (380-760nm) is ≥75%. According to GJB9986-2021, after 400h of artificial climate aging, the color change of the coating must be ≤3L*a*b*. At the same time, due to the terrain characteristics of the alpine areas and the harsh natural environment, higher requirements are placed on the environmental resistance of the coating, such as dry friction color fastness and light color fastness. In addition, snow-type coatings are also required to have certain flame retardant properties.

[0003] The common snow-type paints currently used usually contain oily film-forming substances and organic solvents, which not only pollute the environment, but also release a large amount of toxic gases and corrosive salt mist during the combustion process, causing environmental pollution and endangering human health; they have a single function and cannot simultaneously meet the above-mentioned performance requirements for snow-type paints.

[0004] In view of this, this invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a snow-type flame-retardant coating with high reflectivity and a preparation method and application thereof, by spraying or coating the prepared flame-retardant snow-type coating with high whiteness, high ultraviolet reflectivity and high UV reflectivity to form a coating on the surface of the substrate to simulate the spectral reflection characteristics of snow in the 300-760nm band.

[0006] The purpose of the present invention is to be solved by the following technical solutions:

[0007] In one aspect, a snow-type flame-retardant coating with high reflectivity comprises a primer and a topcoat.

[0008] The primer comprises the following components by weight: 40-50 parts of water-based polymer resin, 30-40 parts of first pigment, 10-20 parts of water-based flame retardant, 1-5 parts of water-based dispersant, 1-5 parts of water-based light stabilizer, 0.1-1 parts of water-based defoamer, 0.1-1 parts of water-based wetting agent, 1-2 parts of moisturizer, and 1-3 parts of curing agent;

[0009] The surface coating comprises the following components by weight: 35-45 parts of water-based polymer resin, 40-50 parts of second pigment, 1-5 parts of water-based dispersant, 1-5 parts of water-based light stabilizer, 0.1-1 parts of water-based defoamer, 0.1-1 parts of water-based wetting agent, 1-2 parts of moisturizer, and 1-3 parts of curing agent;

[0010] The base coating and the surface coating are sequentially coated on a substrate to form a snow-type flame-retardant coating.

[0011] Furthermore, the water-based polymer resin includes but is not limited to any one or more of acrylic resin, polyurethane resin, polyester resin and epoxy resin.

[0012] Furthermore, the first pigment includes any one or more of TiO2, ZnO and lithopone.

[0013] Furthermore, the second pigment includes one or more of Sb2O3, Al2O3, BaSO4, SiO2 and CaCO3.

[0014] Furthermore, the curing agent is any one of an isocyanate water-based curing agent, an ester water-based curing agent and an epoxy water-based curing agent.

[0015] Furthermore, the water-based flame retardant is a halogen-free flame retardant, preferably ammonium polyphosphate.

[0016] Preferably, the aqueous dispersant is sodium polyacrylate, the aqueous light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, the aqueous defoamer is polyether-modified silicone, the aqueous wetting agent is alkylphenol polyoxyethylene ether, the humectant is 1,2-propylene glycol, the isocyanate aqueous curing agent is polyisocyanate (MDI), and the epoxy aqueous curing agent is polypropylene oxide (POEA).

[0017] On the other hand, a method for preparing a snow-type flame-retardant coating with high reflectivity is provided, wherein the preparation method is based on the component raw materials included in the snow-type flame-retardant coating with high reflectivity and the corresponding weight portions of the component raw materials, including a method for preparing a surface coating and a base coating,

[0018] The preparation method of the primer specifically comprises the following steps:

[0019] S1.1. Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, and mix evenly to obtain a mixture a.

[0020] S1.2. Add the aqueous defoamer, aqueous wetting agent and moisturizer to the mixture a, disperse and stir, mix evenly, add grinding beads to grind and filter to obtain the mixture b.

[0021] S1.3. Add the water-based light stabilizer and curing agent to the mixture b, disperse and stir, and mix well to obtain a base coating;

[0022] The preparation method of the surface coating specifically comprises the following steps:

[0023] S2.1. Add the second pigment, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, and mix evenly to obtain a mixture c.

[0024] S2.2. Add the aqueous defoamer, aqueous wetting agent and moisturizer to the mixture c, disperse and stir, mix evenly, add grinding beads to grind and filter, and obtain the mixture d.

[0025] S2.3. Add water-based light stabilizer and curing agent into mixture d, disperse and stir, and mix evenly to obtain the surface coating.

[0026] Furthermore, in steps S1.1 and S2.1, the dispersion stirring speed is 300-500 r / min, and the stirring time is 3-10 min. In steps S1.2 and S2.2, the dispersion stirring speed is 400-700 r / min, and the stirring time is 10-15 min. The grinding speed is 800-1200 r / min, and the grinding time is 60-90 min. In steps S1.3 and S2.3, the dispersion speed is 900-1000 r / min, and the stirring time is 10-20 min.

[0027] Furthermore, when preparing the base coating, the amount of the grinding beads added is 70-80% of the mass of the mixture b, and when preparing the surface coating, the amount of the grinding beads added is 70-80% of the mass of the mixture d.

[0028] In a third aspect, the present invention provides an application of a snow-type flame-retardant coating with high reflectivity, wherein the snow-type flame-retardant coating forms a coating on the surface of a substrate by spraying or coating, specifically, comprising the following steps:

[0029] First, the primer is applied / sprayed onto the substrate and dried.

[0030] Then, the topcoat is applied / sprayed on the basecoat and dried;

[0031] The drying temperature is 80-120°C and the drying time is 10-15 minutes.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The resins and additives used in the present invention are all water-based compounds, do not contain harmful solvents such as benzene and formaldehyde, and heavy metals, are non-toxic, tasteless, non-irritating, and environmentally friendly, and reduce VOC emissions and air pollution during production and construction;

[0034] 2. The snow-type flame-retardant coating of the present invention adopts high whiteness pigment and high ultraviolet reflectivity pigment to prepare the base coating and the surface coating respectively, and then the two coatings are superimposed and coated to make the two structures compounded, so as to meet the requirements of camouflage color whiteness and spectral reflectivity characteristics under the snow background;

[0035] 3. The equipment coated or sprayed with the flame retardant coating prepared by the present invention can be well integrated with the snow background in the ultraviolet and visible light bands, and at the same time, it also has excellent flame retardancy and aging resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a spectral reflection curve diagram of the snow-type flame-retardant coating with high reflectivity prepared in Example 1.

[0039] Figure 2 This is a spectral reflection curve diagram of the snow-type flame-retardant coating with high reflectivity prepared in Example 2.

[0040] Figure 3 This is a spectral reflection curve diagram of the snow-type flame-retardant coating with high reflectivity prepared in Example 3.

[0041] Figure 4 This is a spectral reflection curve diagram of the snow-type flame-retardant coating with high reflectivity prepared in Example 4.

[0042] Figure 5 This is a spectral reflection curve diagram of the snow-type flame-retardant coating with high reflectivity prepared in Example 5.

[0043] Figure 6 This is a spectral reflection curve diagram of the snow-type flame-retardant coating with high reflectivity prepared in Example 6.

[0044] Figure 7 This is a spectral reflection curve diagram of the snow-type flame-retardant coating with high reflectivity prepared in Example 7. DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples consistent with some aspects of the present invention as detailed in the appended claims.

[0046] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] Example 1

[0048] This embodiment 1 provides a snow-type flame-retardant coating with high reflectivity, and the snow-type flame-retardant coating includes a base coating and a surface coating.

[0049] The primer comprises the following components by weight:

[0050] The water-based polymer resin is a water-based acrylic resin, 40 parts by weight;

[0051] The first pigment is TiO2 and ZnO, wherein TiO2 accounts for 70% and ZnO accounts for 30%, 36 parts by weight;

[0052] The water-based flame retardant is ammonium polyphosphate, 12 parts by weight;

[0053] The aqueous dispersant is sodium polyacrylate, 4 parts by weight;

[0054] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 3 parts by weight;

[0055] The water-based defoamer is polyether-modified silicone, 0.8 parts by weight;

[0056] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 0.5 parts by weight;

[0057] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0058] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0059] The preparation method of the primer specifically comprises the following steps:

[0060] Step 1: Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 400r / min, the stirring time is 8min, and mix well to obtain a mixture a.

[0061] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to a mixture a, disperse and stir, the dispersion stirring speed is 500 r / min, the stirring time is 10 min, and after mixing evenly, add grinding beads, grind at a speed of 900 r / min for 70 min, filter after grinding, and obtain a uniformly ground mixture b, wherein the amount of grinding beads added is 70% of the mass of the obtained mixture b.

[0062] Step 3: Add the water-based light stabilizer and curing agent into the mixture b, disperse and stir at a speed of 900 r / min for 10 minutes, and obtain the base coating after mixing evenly.

[0063] The surface coating comprises the following components by weight:

[0064] The water-based polymer resin is a water-based acrylic resin, 40 parts by weight;

[0065] The second pigment is selected from Sb2O3 and SiO2, wherein Sb2O3 accounts for 80% and SiO2 accounts for 20%, 45 parts by weight;

[0066] The aqueous dispersant is sodium polyacrylate, 5 parts by weight;

[0067] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 5 parts by weight;

[0068] The water-based defoamer is polyether-modified silicone, 0.5 parts by weight;

[0069] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 0.5 parts by weight;

[0070] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0071] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0072] The preparation method of the surface coating specifically comprises the following steps:

[0073] Step 1: Add the second pigment, the aqueous polymer resin and the aqueous dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 400 r / min, the stirring time is 10 min, and mix well to obtain a mixture C.

[0074] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to the mixture c, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 10 min, and after mixing evenly, add grinding beads, grind at a speed of 800 r / min for 60 min, filter after grinding, and obtain a uniformly ground mixture d, wherein the amount of grinding beads added is 75% of the mass of the obtained mixture b.

[0075] Step 3: Add the water-based light stabilizer and curing agent into the mixture d, disperse and stir at a speed of 900 r / min for 15 minutes, and obtain the surface coating after mixing evenly.

[0076] Test sample preparation:

[0077] (1) Apply / spray the primer onto the substrate and dry at 80°C for 10 min;

[0078] (2) The top coating is coated / sprayed on the base coating and dried at 80° C. for 10 min to obtain sample 1.

[0079] The prepared sample 1 was tested, and the test results are as follows:

[0080]

[0081] Refer to the attached Figure 1 As shown, the reflectivity test of sample 1 prepared in Example 1 shows that the spectral reflectivity at 350 nm is 76.73%, while the spectral reflectivity at 380-760 nm is as high as 86.26% on average.

[0082] Example 2

[0083] This embodiment 2 provides a snow-type flame-retardant coating with high reflectivity, and the snow-type flame-retardant coating includes a base coating and a surface coating.

[0084] The primer comprises the following components by weight:

[0085] The waterborne polymer resin is a waterborne polyurethane resin, 47 parts by weight;

[0086] The first pigment is TiO2 and Lithopone, wherein TiO2 accounts for 65% and Lithopone accounts for 35%, 30 parts by weight;

[0087] The water-based flame retardant is ammonium polyphosphate, 10 parts by weight;

[0088] The aqueous dispersant is sodium polyacrylate, 4 parts by weight;

[0089] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 3 parts by weight;

[0090] The water-based defoamer is polyether-modified silicone, 1 part by weight;

[0091] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 1 part by weight;

[0092] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0093] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0094] The preparation method of the primer specifically comprises the following steps:

[0095] Step 1: Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir at a speed of 450 r / min for 10 min, and mix well to obtain a mixture a.

[0096] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to a mixture a, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 10 min, and after mixing evenly, add grinding beads, grind at a speed of 900 r / min for 100 min, filter after grinding, and obtain a uniformly ground mixture b, wherein the amount of grinding beads added is 80% of the mass of the obtained mixture b.

[0097] Step 3: Add the water-based light stabilizer and curing agent into the mixture b, disperse and stir at a speed of 900 r / min for 20 minutes, and obtain the base coating after mixing evenly.

[0098] The surface coating comprises the following components by weight:

[0099] The waterborne polymer resin is a waterborne polyurethane resin, 35 parts by weight;

[0100] The second pigment is selected from Sb2O3 and Al2O3, wherein Sb2O3 accounts for 60% and Al2O3 accounts for 40%, 50 parts by weight;

[0101] The aqueous dispersant is sodium polyacrylate, 5 parts by weight;

[0102] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 5 parts by weight;

[0103] The water-based defoamer is polyether-modified silicone, 0.5 parts by weight;

[0104] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 0.5 parts by weight;

[0105] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0106] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0107] The preparation method of the surface coating specifically comprises the following steps:

[0108] Step 1: Add the second pigment, the aqueous polymer resin and the aqueous dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 500 r / min, the stirring time is 10 min, and mix well to obtain a mixture C.

[0109] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to the mixture c, disperse and stir, the dispersion stirring speed is 500 r / min, the stirring time is 15 min, and after mixing evenly, add grinding beads, grind at a speed of 900 r / min for 100 min, filter after grinding, and obtain a uniformly ground mixture d, wherein the amount of grinding beads added is 80% of the mass of the obtained mixture b.

[0110] Step 3: Add the water-based light stabilizer and curing agent into the mixture d, disperse and stir at a speed of 1000 r / min for 15 minutes, and obtain the surface coating after mixing evenly.

[0111] Test sample preparation:

[0112] (1) Apply / spray the primer onto the substrate and dry at 80°C for 10 min;

[0113] (2) The top coating is coated / sprayed on the base coating and dried at 80° C. for 10 min to obtain sample 2.

[0114] The prepared sample 2 was tested, and the test results are as follows:

[0115]

[0116] See attached Figure 2 As shown, the reflectivity test of sample 2 prepared in Example 2 shows that the spectral reflectivity at 350 nm is 77.29%, while the spectral reflectivity at 380-760 nm is as high as 84.73% on average.

[0117] Example 3

[0118] This embodiment 3 provides a snow-type flame-retardant coating with high reflectivity, and the snow-type flame-retardant coating includes a base coating and a surface coating.

[0119] The primer comprises the following components by weight:

[0120] The waterborne polymer resin is a waterborne epoxy resin, 45 parts by weight;

[0121] The first pigment is selected from ZnO and Lithopone, wherein ZnO accounts for 80% and Lithopone accounts for 20%, 30 parts by weight;

[0122] The water-based flame retardant is ammonium polyphosphate, 10 parts by weight;

[0123] The aqueous dispersant is sodium polyacrylate, 4 parts by weight;

[0124] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 3 parts by weight;

[0125] The water-based defoamer is polyether-modified silicone, 1 part by weight;

[0126] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 1 part by weight;

[0127] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0128] The curing agent is polypropylene oxide (POEA), 2 parts by weight.

[0129] The preparation method of the primer specifically comprises the following steps:

[0130] Step 1: Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 500r / min, the stirring time is 10min, and mix well to obtain a mixture a.

[0131] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to a mixture a, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 15 min, and after mixing evenly, add grinding beads, grind at a speed of 1000 r / min for 120 min, filter after grinding, and obtain a uniformly ground mixture b, wherein the amount of grinding beads added is 80% of the mass of the obtained mixture b.

[0132] Step 3: Add the water-based light stabilizer and curing agent into the mixture b, disperse and stir at a speed of 900 r / min for 15 minutes, and mix well to obtain the base coating.

[0133] The surface coating comprises the following components by weight:

[0134] The waterborne polymer resin is a waterborne epoxy resin, 40 parts by weight;

[0135] The second pigment is selected from Sb2O3 and CaCO3, wherein Sb2O3 accounts for 85% and CaCO3 accounts for 15%, 45 parts by weight;

[0136] The aqueous dispersant is sodium polyacrylate, 5 parts by weight;

[0137] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 4 parts by weight;

[0138] The water-based defoamer is polyether-modified silicone, 1 part by weight;

[0139] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 1 part by weight;

[0140] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0141] The curing agent is polypropylene oxide (POEA), 2 parts by weight.

[0142] The preparation method of the surface coating specifically comprises the following steps:

[0143] Step 1: Add the second pigment, the aqueous polymer resin and the aqueous dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 8 min, and mix well to obtain a mixture C.

[0144] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to the mixture c, disperse and stir, the dispersion stirring speed is 700 r / min, the stirring time is 10 min, and after mixing evenly, add grinding beads, grind at a speed of 1200 r / min for 90 min, filter after grinding, and obtain a uniformly ground mixture d, wherein the amount of grinding beads added is 70% of the mass of the obtained mixture b.

[0145] Step 3: Add the water-based light stabilizer and curing agent into the mixture d, disperse and stir at a speed of 950 r / min for 15 minutes, and obtain the surface coating after mixing evenly.

[0146] Test sample preparation:

[0147] (1) Apply / spray the primer onto the substrate and dry at 110°C for 15 minutes;

[0148] (2) The top coating is coated / sprayed on the base coating and dried at 110° C. for 15 min to obtain sample 3.

[0149] The prepared sample 3 was tested, and the test results are as follows:

[0150]

[0151] See attached Figure 3 As shown, the reflectivity test of sample 3 prepared in Example 3 shows that the spectral reflectivity at 350 nm is 74.44%, while the spectral reflectivity at 380-760 nm is as high as 85.86% on average.

[0152] Example 4

[0153] This embodiment 4 provides a snow-type flame-retardant coating with high reflectivity, and the snow-type flame-retardant coating includes a base coating and a surface coating.

[0154] The primer comprises the following components by weight:

[0155] The waterborne polymer resin is a waterborne epoxy resin, 42 parts by weight;

[0156] The first pigment is selected from ZnO and Lithopone, wherein ZnO accounts for 70% and Lithopone accounts for 30%, 35 parts by weight;

[0157] The water-based flame retardant is ammonium polyphosphate, 12 parts by weight;

[0158] The aqueous dispersant is sodium polyacrylate, 4 parts by weight;

[0159] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 3 parts by weight;

[0160] The water-based defoamer is polyether-modified silicone, 1 part by weight;

[0161] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 1 part by weight;

[0162] The moisturizer is 1,2-propylene glycol, 1 part by weight;

[0163] The curing agent is polyisocyanate (MDI), 1 part by weight.

[0164] The preparation method of the primer specifically comprises the following steps:

[0165] Step 1: Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 500r / min, the stirring time is 10min, and mix well to obtain a mixture a.

[0166] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to a mixture a, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 15 min, and after mixing evenly, add grinding beads, grind at a speed of 1000 r / min for 120 min, filter after grinding, and obtain a uniformly ground mixture b, wherein the amount of grinding beads added is 70% of the mass of the obtained mixture b.

[0167] Step 3: Add the water-based light stabilizer and curing agent into the mixture b, disperse and stir at a speed of 900 r / min for 15 minutes, and mix well to obtain the base coating.

[0168] The surface coating comprises the following components by weight:

[0169] The waterborne polymer resin is a waterborne epoxy resin, 40 parts by weight;

[0170] The second pigment is selected from Sb2O3 and BaSO4, wherein Sb2O3 accounts for 80% and BaSO4 accounts for 20%, 50 parts by weight;

[0171] The aqueous dispersant is sodium polyacrylate, 5 parts by weight;

[0172] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 4 parts by weight;

[0173] The water-based defoamer is polyether-modified silicone, 1 part by weight;

[0174] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 1 part by weight;

[0175] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0176] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0177] The preparation method of the surface coating specifically comprises the following steps:

[0178] Step 1: Add the second pigment, the aqueous polymer resin and the aqueous dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 8 min, and mix well to obtain a mixture C.

[0179] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to the mixture c, disperse and stir, the dispersion stirring speed is 700 r / min, the stirring time is 10 min, and after mixing evenly, add grinding beads, grind at a speed of 1200 r / min for 90 min, filter after grinding, and obtain a uniformly ground mixture d, wherein the amount of grinding beads added is 75% of the mass of the obtained mixture b.

[0180] Step 3: Add the water-based light stabilizer and curing agent into the mixture d, disperse and stir at a speed of 950 r / min for 15 minutes, and obtain the surface coating after mixing evenly.

[0181] Test sample preparation:

[0182] (1) Apply / spray the primer onto the substrate and dry at 80°C for 10 min;

[0183] (2) The top coating is coated / sprayed on the base coating and dried at 80° C. for 10 min to obtain sample 4.

[0184] The prepared sample 4 was tested, and the test results are as follows:

[0185]

[0186] See attached Figure 4 As shown, the reflectivity test of sample 4 prepared in Example 4 shows that the spectral reflectivity at 350 nm is 73.27%, while the spectral reflectivity at 380-760 nm is as high as 85.57% on average.

[0187] Example 5

[0188] This embodiment 5 provides a snow-type flame-retardant coating with high reflectivity, and the snow-type flame-retardant coating includes a base coating and a surface coating.

[0189] The primer comprises the following components by weight:

[0190] The water-based polymer resin is a water-based acrylic resin, 45 parts by weight;

[0191] The first pigment is TiO2 and ZnO, wherein TiO2 accounts for 80% and ZnO accounts for 20%, 30 parts by weight;

[0192] The water-based flame retardant is ammonium polyphosphate, 13 parts by weight;

[0193] The aqueous dispersant is sodium polyacrylate, 4 parts by weight;

[0194] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 3 parts by weight;

[0195] The water-based defoamer is polyether-modified silicone, 0.8 parts by weight;

[0196] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 0.8 parts by weight;

[0197] The moisturizer is 1,2-propylene glycol, 1.4 parts by weight;

[0198] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0199] The preparation method of the primer specifically comprises the following steps:

[0200] Step 1: Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 450r / min, the stirring time is 5min, and mix well to obtain a mixture a.

[0201] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to a mixture a, disperse and stir, the dispersion stirring speed is 500 r / min, the stirring time is 13 min, and after mixing evenly, add grinding beads, grind at a speed of 900 r / min for 90 min, filter after grinding, and obtain a uniformly ground mixture b, wherein the amount of grinding beads added is 70% of the mass of the obtained mixture b.

[0202] Step 3: Add the water-based light stabilizer and curing agent into the mixture b, disperse and stir at a speed of 900 r / min for 15 minutes, and mix well to obtain the base coating.

[0203] The surface coating comprises the following components by weight:

[0204] The water-based polymer resin is a water-based acrylic resin, 45 parts by weight;

[0205] The second pigment is Al2O3 and BaSO4, wherein Al2O3 accounts for 70% and BaSO4 accounts for 30%, 40 parts by weight;

[0206] The aqueous dispersant is sodium polyacrylate, 5 parts by weight;

[0207] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 5 parts by weight;

[0208] The water-based defoamer is polyether-modified silicone, 0.5 parts by weight;

[0209] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 0.5 parts by weight;

[0210] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0211] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0212] The preparation method of the surface coating specifically comprises the following steps:

[0213] Step 1: Add the second pigment, the aqueous polymer resin and the aqueous dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 400 r / min, the stirring time is 10 min, and mix well to obtain a mixture C.

[0214] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to the mixture c, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 15 min, and after mixing evenly, add grinding beads, grind at a speed of 900 r / min for 60 min, filter after grinding, and obtain a uniformly ground mixture d, wherein the amount of grinding beads added is 70% of the mass of the obtained mixture b.

[0215] Step 3: Add the water-based light stabilizer and curing agent into the mixture d, disperse and stir at a speed of 1000 r / min for 15 minutes, and obtain the surface coating after mixing evenly.

[0216] Test sample preparation:

[0217] (1) Apply / spray the primer onto the substrate and dry at 80°C for 10 min;

[0218] (2) The top coating is coated / sprayed on the base coating and dried at 80° C. for 10 min to obtain sample 5.

[0219] The prepared sample 5 was tested, and the test results are as follows:

[0220]

[0221] See attached Figure 5 As shown, the reflectivity test of sample 5 prepared in Example 5 shows that the spectral reflectivity at 350 nm is 77.26%, while the spectral reflectivity at 380-760 nm is as high as 84.72% on average.

[0222] Example 6

[0223] This embodiment 6 provides a snow-type flame-retardant coating with high reflectivity, and the snow-type flame-retardant coating includes a base coating and a surface coating.

[0224] The primer comprises the following components by weight:

[0225] The waterborne polymer resin is a waterborne polyurethane resin, 42 parts by weight;

[0226] The first pigment is TiO2 and Lithopone, wherein TiO2 accounts for 70% and Lithopone accounts for 30%, 32 parts by weight;

[0227] The water-based flame retardant is ammonium polyphosphate, 13 parts by weight;

[0228] The aqueous dispersant is sodium polyacrylate, 4 parts by weight;

[0229] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 3 parts by weight;

[0230] The water-based defoamer is polyether-modified silicone, 1 part by weight;

[0231] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 1 part by weight;

[0232] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0233] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0234] The preparation method of the primer specifically comprises the following steps:

[0235] Step 1: Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir at a speed of 450 r / min for 10 min, and mix well to obtain a mixture a.

[0236] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to a mixture a, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 10 min, and after mixing evenly, add grinding beads, grind at a speed of 900 r / min for 100 min, filter after grinding, and obtain a uniformly ground mixture b, wherein the amount of grinding beads added is 75% of the mass of the obtained mixture b.

[0237] Step 3: Add the water-based light stabilizer and curing agent into the mixture b, disperse and stir at a speed of 900 r / min for 20 minutes, and obtain the base coating after mixing evenly.

[0238] The surface coating comprises the following components by weight:

[0239] The waterborne polymer resin is a waterborne polyurethane resin, 40 parts by weight;

[0240] The second pigment is Al2O3 and SiO2, wherein Al2O3 accounts for 60% and SiO2 accounts for 40%, 45 parts by weight;

[0241] The aqueous dispersant is sodium polyacrylate, 5 parts by weight;

[0242] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 5 parts by weight;

[0243] The water-based defoamer is polyether-modified silicone, 0.5 parts by weight;

[0244] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 0.5 parts by weight;

[0245] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0246] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0247] The preparation method of the surface coating specifically comprises the following steps:

[0248] Step 1: Add the second pigment, the aqueous polymer resin and the aqueous dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 500 r / min, the stirring time is 10 min, and mix well to obtain a mixture C.

[0249] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to the mixture c, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 15 min, and after mixing evenly, add grinding beads, grind at a speed of 1100 r / min for 90 min, filter after grinding, and obtain a uniformly ground mixture d, wherein the amount of grinding beads added is 75% of the mass of the obtained mixture b.

[0250] Step 3: Add the water-based light stabilizer and curing agent into the mixture d, disperse and stir at a speed of 950 r / min for 15 minutes, and obtain the surface coating after mixing evenly.

[0251] Test sample preparation:

[0252] (1) Apply / spray the primer onto the substrate and dry at 80°C for 10 min;

[0253] (2) The top coating is coated / sprayed on the base coating and dried at 80° C. for 10 min to obtain sample 6.

[0254] The prepared sample 6 was tested, and the test results are as follows:

[0255]

[0256] Refer to the attached Figure 6 As shown, the reflectivity test of sample 6 prepared in Example 6 shows that the spectral reflectivity at 350 nm is 75.12%, while the spectral reflectivity at 380-760 nm is as high as 82.64% on average.

[0257] Example 7

[0258] This embodiment 7 provides a snow-type flame-retardant coating with high reflectivity, and the snow-type flame-retardant coating includes a base coating and a surface coating.

[0259] The primer comprises the following components by weight:

[0260] The waterborne polymer resin is a waterborne polyurethane resin, 42 parts by weight;

[0261] The first pigment is TiO2 and ZnO, wherein TiO2 accounts for 80% and ZnO accounts for 20%, 30 parts by weight;

[0262] The water-based flame retardant is ammonium polyphosphate, 15 parts by weight;

[0263] The aqueous dispersant is sodium polyacrylate, 4 parts by weight;

[0264] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 3 parts by weight;

[0265] The water-based defoamer is polyether-modified silicone, 1 part by weight;

[0266] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 1 part by weight;

[0267] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0268] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0269] The preparation method of the primer specifically comprises the following steps:

[0270] Step 1: Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 450r / min, the stirring time is 5min, and mix well to obtain a mixture a.

[0271] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to a mixture a, disperse and stir, the dispersion stirring speed is 500 r / min, the stirring time is 13 min, and after mixing evenly, add grinding beads, grind at a speed of 900 r / min for 90 min, filter after grinding, and obtain a uniformly ground mixture b, wherein the amount of grinding beads added is 80% of the mass of the obtained mixture b.

[0272] Step 3: Add the water-based light stabilizer and curing agent into the mixture b, disperse and stir at a speed of 900 r / min for 15 minutes, and mix well to obtain the base coating.

[0273] The surface coating comprises the following components by weight:

[0274] The waterborne polymer resin is a waterborne polyurethane resin, 35 parts by weight;

[0275] The second pigment is Al2O3 and CaCO3, wherein Al2O3 accounts for 90% and CaCO3 accounts for 10%, 50 parts by weight;

[0276] The aqueous dispersant is sodium polyacrylate, 5 parts by weight;

[0277] The water-based light stabilizer is a liquid hindered amine light stabilizer containing an amino ether group, 5 parts by weight;

[0278] The water-based defoamer is polyether-modified silicone, 0.5 parts by weight;

[0279] The aqueous wetting agent is alkylphenol polyoxyethylene ether, 0.5 parts by weight;

[0280] The moisturizer is 1,2-propylene glycol, 2 parts by weight;

[0281] The curing agent is polyisocyanate (MDI), 2 parts by weight.

[0282] The preparation method of the surface coating specifically comprises the following steps:

[0283] Step 1: Add the second pigment, the aqueous polymer resin and the aqueous dispersant into a mixing container, disperse and stir, the dispersion stirring speed is 500 r / min, the stirring time is 10 min, and mix well to obtain a mixture C.

[0284] Step 2: Add an aqueous defoamer, an aqueous wetting agent, and a moisturizer to the mixture c, disperse and stir, the dispersion stirring speed is 600 r / min, the stirring time is 15 min, and after mixing evenly, add grinding beads, grind at a speed of 1100 r / min for 90 min, filter after grinding, and obtain a uniformly ground mixture d, wherein the amount of grinding beads added is 70% of the mass of the obtained mixture b.

[0285] Step 3: Add the water-based light stabilizer and curing agent into the mixture d, disperse and stir at a speed of 950 r / min for 15 minutes, and obtain the surface coating after mixing evenly.

[0286] Test sample preparation:

[0287] (1) Apply / spray the primer onto the substrate and dry at 80°C for 10 min;

[0288] (2) The top coating is coated / sprayed on the base coating and dried at 80° C. for 10 min to obtain sample 7.

[0289] The prepared sample 7 was tested, and the test results are as follows:

[0290]

[0291] Refer to the attached Figure 7As shown, the reflectivity test of sample 7 prepared by Example 7 shows that the spectral reflectivity at 350 nm is 72.22%, while the spectral reflectivity at 380-760 nm is as high as 84.43% on average.

[0292] In summary, the present invention provides a snow-type flame-retardant coating with high reflectivity, whose whiteness and spectral reflection characteristics in the 300-760nm band are similar to those of snow, and has excellent flame retardancy and aging resistance. At the same time, the coating system used in the present invention is a water-based system, does not contain harmful substances such as organic solvents, and meets national environmental protection requirements.

[0293] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0294] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A snow-type flame-retardant coating with high reflectivity, characterized in that: Including primer and topcoat. The primer comprises the following components by weight: 40-50 parts of water-based polymer resin, 30-40 parts of first pigment, 10-20 parts of water-based flame retardant, 1-5 parts of water-based dispersant, 1-5 parts of water-based light stabilizer, 0.1-1 parts of water-based defoamer, 0.1-1 parts of water-based wetting agent, 1-2 parts of moisturizer, and 1-3 parts of curing agent; The surface coating comprises the following components by weight: 35-45 parts of water-based polymer resin, 40-50 parts of second pigment, 1-5 parts of water-based dispersant, 1-5 parts of water-based light stabilizer, 0.1-1 parts of water-based defoamer, 0.1-1 parts of water-based wetting agent, 1-2 parts of moisturizer, and 1-3 parts of curing agent; The base coating and the surface coating are sequentially coated on a substrate to form a snow-type flame-retardant coating.

2. The snow-type flame-retardant coating with high reflectivity according to claim 1, characterized in that: The waterborne polymer resin includes, but is not limited to, any one or more of acrylic resin, polyurethane resin, polyester resin and epoxy resin.

3. The snow-type flame-retardant coating with high reflectivity according to claim 1, characterized in that: The first pigment includes any one or more of TiO2, ZnO and lithopone.

4. The snow-type flame-retardant coating with high reflectivity according to claim 1, characterized in that: The second pigment includes one or more of Sb2O3, Al2O3, BaSO4, SiO2 and CaCO3.

5. The snow-type flame-retardant coating with high reflectivity according to claim 1, characterized in that: The curing agent is any one of an isocyanate water-based curing agent, an ester water-based curing agent and an epoxy water-based curing agent.

6. The snow-type flame-retardant coating with high reflectivity according to claim 1, characterized in that: The water-based flame retardant is a halogen-free flame retardant.

7. A method for preparing a snow-type flame-retardant coating with high reflectivity, characterized in that: The preparation method is based on the raw materials and weight proportions of the components of the high reflectivity snow-type flame-retardant coating according to any one of claims 1 to 6, and includes a preparation method for a surface coating and a base coating. The preparation method of the primer specifically comprises the following steps: S1.

1. Add the first pigment, water-based flame retardant, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, and mix evenly to obtain a mixture a. S1.

2. Add the aqueous defoamer, aqueous wetting agent and moisturizer to the mixture a, disperse and stir, mix evenly, add grinding beads to grind and filter to obtain a mixture b. S1.

3. Add the water-based light stabilizer and curing agent to the mixture b, disperse and stir, and mix well to obtain a base coating; The preparation method of the surface coating specifically comprises the following steps: S2.

1. Add the second pigment, water-based polymer resin and water-based dispersant into a mixing container, disperse and stir, and mix evenly to obtain a mixture c. S2.

2. Add the aqueous defoamer, aqueous wetting agent and moisturizer to the mixture c, disperse and stir, mix evenly, add grinding beads to grind and filter, and obtain a mixture d. S2.

3. Add water-based light stabilizer and curing agent into mixture d, disperse and stir, and mix evenly to obtain the surface coating.

8. The method for preparing the snow-type flame-retardant coating with high reflectivity according to claim 7, characterized in that: In steps S1.1 and S2.1, the dispersion stirring speed is 300-500 r / min, and the stirring time is 3-10 min. In steps S1.2 and S2.2, the dispersing stirring speed is 400-700 r / min, the stirring time is 10-15 min, the grinding speed is 800-1200 r / min, and the grinding time is 60-90 min. In steps S1.3 and S2.3, the dispersion speed is 900-1000 r / min, and the stirring time is 10-20 min.

9. The method for preparing the snow-type flame-retardant coating with high reflectivity according to claim 7, characterized in that: When preparing the base coating, the amount of the grinding beads added is 70-80% of the mass of the mixture b, and when preparing the surface coating, the amount of the grinding beads added is 70-80% of the mass of the mixture d.

10. The use of the snow-type flame-retardant coating with high reflectivity according to any one of claims 1 to 6, characterized in that: The snow-type flame-retardant coating forms a coating on the surface of the substrate by spraying or coating. Specifically, the steps include: First, the primer is applied / sprayed onto the substrate and dried. Then, the topcoat is applied / sprayed on the basecoat and dried; The drying temperature is 80-120°C and the drying time is 10-15 minutes.

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