A traffic sign reflective paint, its preparation method and device

Abstract

The present invention provides a traffic sign reflective paint, a preparation method and a device thereof. The traffic sign reflective paint comprises a reflective topcoat. The reflective topcoat comprises the following raw materials in parts by weight: 40-50 parts of a film-forming emulsion, 16-20 parts of modified hollow glass microspheres, 10-15 parts of silica sol, 6-10 parts of titanium dioxide, 2.5-3.5 parts of silane coupling agent modified basalt chopped fibers, 0.3-0.6 parts of hydroxyethyl cellulose, 0.1-0.3 parts of an ultraviolet absorber, 1.5-3 parts of a thixotropic agent, 0.3-0.6 parts of an antifoaming agent, 0.2-0.4 parts of a dispersant, 10-15 parts of water, and 0-5 parts of a pigment. In the traffic sign reflective paint of the present invention, the hollow glass microspheres have good dispersibility and strong binding force with the reflective topcoat film. The reflective topcoat film has excellent impact resistance and aging resistance, and can maintain a good warning effect persistently.

Description

Technical Field

[0001] The present invention relates to the technical field of reflective paint, and particularly relates to a traffic sign reflective paint and its preparation method and device. Background Art

[0002] Traffic signs use graphic symbols and text to convey specific information, and are facilities used to manage traffic and indicate driving directions to ensure smooth traffic flow and driving safety. It mainly includes warning signs, prohibition signs, indication signs, guide signs, tourist area signs, road construction safety signs, etc. These signs play a crucial role in ensuring the safety and smoothness of road traffic. They can provide timely and accurate information to drivers and pedestrians, helping everyone understand the road conditions and abide by traffic rules, thereby avoiding traffic accidents.

[0003] At night or in low-light conditions, traffic signs painted with ordinary paint are often difficult for drivers to clearly identify, while reflective paint can significantly improve the visibility of traffic signs through its reflective properties, helping drivers make correct driving decisions in a timely manner. At the same time, the strong reflective effect of reflective paint can attract the attention of drivers and play a good warning role. Especially in complex or dangerous traffic environments, such as curves, intersections, school areas, etc., the use of reflective paint can effectively reduce the incidence of traffic accidents.

[0004] Reflective paint can, under light irradiation, through reflective materials such as hollow glass microspheres inside it, reflect the light back along the original path, thus forming an obvious reflective effect at night or in a dim environment.

[0005] However, in current reflective paints, the dispersibility of hollow glass microspheres is still not excellent enough, and the bonding force between the hollow glass microspheres and the reflective paint film is also not strong enough. This will cause the paint film to crack easily when subjected to external force impact, and after the reflective paint film is exposed to sunlight for a long time, it will exacerbate the formation and development of cracks in the reflective paint film, and even the hollow glass microspheres will peel off subsequently, thus affecting the warning function of traffic signs. Summary of the Invention

[0006] The purpose of the present invention is to provide a traffic sign reflective paint and its preparation method and device. In this traffic sign reflective paint, the hollow glass microspheres have good dispersibility, strong bonding force with the reflective topcoat film, the reflective paint film has excellent impact resistance and aging resistance, and can maintain a good warning function persistently.

[0007] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0008] A traffic sign reflective paint, the traffic sign reflective paint includes a reflective topcoat;

[0009] The reflective topcoat comprises the following raw materials in parts by weight: 40-50 parts of film-forming emulsion, 16-20 parts of modified hollow glass microspheres, 10-15 parts of silica sol, 6-10 parts of titanium dioxide, 2.5-3.5 parts of basalt chopped fibers modified with silane coupling agent, 0.3-0.6 parts of hydroxyethyl cellulose, 0.1-0.3 parts of ultraviolet absorber, 1.5-3 parts of thixotropic agent, 0.3-0.6 parts of defoaming agent, 0.2-0.4 parts of dispersant, 10-15 parts of water, and 0-5 parts of pigment.

[0010] Preferably, the traffic sign reflective paint further comprises a primer, which comprises the following raw materials in parts by weight: 50-60 parts of film-forming emulsion, 10-15 parts of silica sol, 10-13 parts of light calcium carbonate, 2-3 parts of basalt chopped fibers modified with silane coupling agent, 0.5-1 part of hydroxyethyl cellulose, 0.1-0.3 parts of ultraviolet absorber, 1.5-2.5 parts of thixotropic agent, 0.2-0.5 parts of defoaming agent, 0.2-0.4 parts of dispersant, 6-10 parts of water, and 0-4 parts of pigment.

[0011] Preferably, the preparation method of the modified hollow glass microspheres comprises the following steps:

[0012] 1) Add hollow glass microspheres and amino silane coupling agent to ethanol, heat to 70-75 °C while stirring, and keep stirring at a constant temperature for 7-10 h under a nitrogen atmosphere. Then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres;

[0013] 2) Dissolve neopentyl glycol and p-toluenesulfonic acid in N,N-dimethylformamide to obtain a mixed solution; under a nitrogen atmosphere, place 3 amino-modified hollow glass microspheres and 2,2-dimethylolpropionic acid in N,N-dimethylformamide, then heat to 140-150 °C while stirring, and slowly dropwise add the mixed solution. After the addition is completed, continue stirring for 4-5 h while performing ultrasonic treatment; then filter, wash with N,N-dimethylformamide, and dry to obtain modified hollow glass microspheres.

[0014] Preferably, in step 1), the particle size of the hollow glass microspheres is 20-60 μm;

[0015] The mass-volume ratio of the hollow glass microspheres, amino silane coupling agent, and ethanol is 10-15 g: 3-5 g: 70-100 mL; the amino silane coupling agent includes one or more of KH540 and KH550;

[0016] In step 2), the mass ratio of the amino-modified hollow microspheres, 2,2-dimethylolpropionic acid, neopentyl glycol, and p-toluenesulfonic acid is 30: 3-4.5: 2-3: 0.02-0.04; the power of the ultrasonic treatment is 300-600 W.

[0017] Preferably, the method for preparing the silica sol comprises the following steps:

[0018] Add ammonia water to the ethanol / water mixture, stir and mix, then drop tetraethoxysilane into it, and continue stirring for 3.5-4.5 hours after the dropwise addition is completed, to obtain the silica sol;

[0019] The volume ratio of the ethanol / water mixture, ammonia water, and tetraethoxysilane is 100:1-1.1:8.5-9.5;

[0020] In the ethanol / water mixed liquid, the volume ratio of water to ethanol is 1:3-3.5.

[0021] Preferably, the method for preparing the silane coupling agent modified basalt chopped fibers comprises the following steps:

[0022] Adding a silane coupling agent to an ethanol / water mixture, stirring and mixing, then adding basalt chopped fibers with a length of 200-500 μm, stirring and mixing for 6-10 hours, and then filtering, washing, and drying to obtain the silane coupling agent modified basalt chopped fibers;

[0023] The mass volume ratio of the ethanol / water mixture, the silane coupling agent, and the basalt chopped fibers is 100-150 mL: 1-1.3 g: 20-25 g;

[0024] In the ethanol / water mixture, the volume ratio of water to ethanol is 1:1.5-2;

[0025] The silane coupling agent is at least one of KH550 and KH560.

[0026] Preferably, the film-forming emulsion is a pure acrylic emulsion; the solid content of the pure acrylic emulsion is 38-43%;

[0027] The ultraviolet absorber is ultraviolet absorber UV-5050;

[0028] The thixotropic agent is composed of fumed silica and polyamide wax mixed in a mass ratio of 1:0.2-0.5;

[0029] The defoamer is BYK-025 or BYK-028;

[0030] The dispersant is BYK-190 or BYK-191.

[0031] Preferably, the particle size of the light calcium carbonate is 200-300 mesh.

[0032] The pigment of the present invention is generally a yellow pigment, and preferably, the pigment is iron oxide yellow.

[0033] As a general inventive concept, the present invention provides a method for preparing a traffic sign reflective paint, comprising the following steps: weighing each raw material according to the ratio; stirring and mixing a film-forming emulsion, silica sol, and hydroxyethyl cellulose for 20 - 30 min, then adding modified hollow glass microspheres and silane coupling agent-modified basalt short fibers, stirring and mixing for 10 - 15 min, and then adding the remaining raw materials, stirring and mixing for 5 - 10 min to obtain the product.

[0034] As a general inventive concept, the present invention provides a device for implementing the above preparation method. The device comprises a stirring tank, a tank cover is installed on the stirring tank, and a vertically arranged stirring rod is provided in the stirring tank; a driving device is installed on the tank cover, the output shaft of the driving device penetrates through the tank cover and is rotatably connected with the tank cover in a sealed manner, and the bottom end of the output shaft of the driving device is fixedly connected with the top end of the stirring rod through a coupling;

[0035] Two stirring blades are installed on both sides of the lower end of the stirring rod. The stirring blades are fan-shaped and obliquely arranged relative to the stirring rod, and the end with a smaller cross-section of the stirring blade is fixedly connected with the stirring rod;

[0036] The tank cover is communicated with a feed inlet, and a feed inlet cover is installed on the feed inlet; the bottom of the stirring tank is communicated with a discharge pipe, and a discharge valve is installed on the discharge pipe.

[0037] The device for preparing the traffic sign reflective paint of the present invention has the biggest difference from a conventional stirring device in the setting of the stirring blades. Through the fan-shaped and obliquely arranged stirring blades relative to the stirring rod, a larger vortex can be formed in the paint during the preparation of the traffic sign reflective paint, thereby enhancing the mixing effect between the raw materials.

[0038] The beneficial effects of the present invention are as follows:

[0039] Silane coupling agent-modified basalt short fibers are added to the reflective topcoat and primer of the present invention, which can make the paint film less likely to be damaged and cracked when subjected to external forces, and has higher aging resistance. In addition, the silane coupling agent-modified basalt short fibers can have good dispersion in the paint film, and a three-dimensional network structure can be formed in the paint film. Furthermore, the agglomeration of hollow glass microspheres can be inhibited in the reflective topcoat film, so that the hollow glass microspheres maintain a high degree of dispersion, and the uniformity and stability of the paint film are enhanced.

[0040] The modified hollow glass microspheres of the present invention are grafted with hyperbranched hydroxyl polyester resin on the surface. Therefore, in the reflective topcoat, the surface has abundant hydroxyl groups, which significantly enhances the dispersion performance of the hollow glass microspheres, and also significantly enhances the bonding force between the hollow glass microspheres and the paint film. Even after being subjected to impact and long-term sunlight irradiation, there is still a strong bonding force between the hollow glass microspheres and the paint film, which is not easy to loosen and will not peel off. The crack resistance of the reflective paint film is significantly enhanced, enabling the reflective paint film to continuously maintain excellent warning effects.

[0041] In the reflective paint of the present invention, a film-forming emulsion and silica sol are used in combination in the reflective topcoat and the primer. On the one hand, it can strengthen the surface roughness of the paint film, which can strengthen the physical interlocking degree between the reflective topcoat film and the primer film, thereby enhancing the bonding force between the reflective topcoat film and the primer film, and can also improve the bonding force between the primer film and the traffic sign substrate, thus strengthening the adhesion of the overall paint film; on the other hand, it will also strengthen the bonding force between the hollow glass microspheres and the paint film.

[0042] The traffic sign reflective paint of the present invention not only includes a reflective topcoat but also a primer. The primer has a strong bonding force with the traffic sign substrate, thereby overall enhancing the adhesion between the paint film and the traffic sign substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0044] Figure 1 It is a schematic structural diagram of the device in Embodiment 7 of the present invention;

[0045] In the figure: 1, stirring tank; 2, tank cover; 3, stirring rod; 4, driving device; 5, stirring blade; 6, feed inlet; 7, discharge pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0047] Preparation Example 1:

[0048] A preparation method of modified hollow glass microspheres, comprising the following steps:

[0049] 1) Add hollow glass microspheres with a particle size of 20 - 60 μm and amino silane coupling agent KH540 to ethanol, heat to 75 °C while stirring, keep stirring at a constant temperature for 7 h under a nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres;

[0050] The mass - volume ratio of the hollow glass microspheres, amino silane coupling agent, and ethanol is 12 g:5 g:80 mL.

[0051] 2) Dissolve 3 g of neopentyl glycol and 0.02 g of p - toluenesulfonic acid in 50 mL of N,N - dimethylformamide to obtain a mixed solution; under a nitrogen atmosphere, place 30 g of amino - modified hollow glass microspheres and 4 g of 2,2 - dimethylolpropionic acid in 600 mL of N,N - dimethylformamide, then heat to 140 °C while stirring, slowly add the mixed solution dropwise, continue stirring for 5 h after the addition, perform ultrasonic treatment while stirring, and the power of the ultrasonic treatment is 500 W; then filter, wash with N,N - dimethylformamide, and dry to obtain modified hollow glass microspheres.

[0052] Preparation Example 2:

[0053] A preparation method of modified hollow glass microspheres, comprising the following steps:

[0054] 1) Add hollow glass microspheres with a particle size of 20 - 60 μm and amino silane coupling agent KH550 to ethanol, heat to 70 °C while stirring, keep stirring at a constant temperature for 10 h under a nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino - modified hollow glass microspheres;

[0055] The mass - volume ratio of the hollow glass microspheres, amino silane coupling agent, and ethanol is 10 g:3 g:70 mL.

[0056] 2) Dissolve 2.5 g of neopentyl glycol and 0.04 g of p - toluenesulfonic acid in 60 mL of N,N - dimethylformamide to obtain a mixed solution; under a nitrogen atmosphere, place 30 g of amino - modified hollow glass microspheres and 3 g of 2,2 - dimethylolpropionic acid in 600 mL of N,N - dimethylformamide, then heat to 150 °C while stirring, slowly add the mixed solution dropwise, continue stirring for 4 h after the addition, perform ultrasonic treatment while stirring, and the power of the ultrasonic treatment is 300 W; then filter, wash with N,N - dimethylformamide, and dry to obtain modified hollow glass microspheres.

[0057] Preparation Example 3:

[0058] A preparation method of modified hollow glass microspheres, comprising the following steps:

[0059] 1) Add hollow glass microspheres with a particle size of 20 - 60 μm and amino silane coupling agent KH550 to ethanol, heat to 72 °C while stirring, keep stirring at a constant temperature for 8 h under a nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres;

[0060] The mass-volume ratio of the hollow glass microspheres, amino silane coupling agent, and ethanol is 15 g : 4 : 100 mL.

[0061] 2) Dissolve 2 g of neopentyl glycol and 0.03 g of p-toluenesulfonic acid in 60 mL of N,N-dimethylformamide to obtain a mixed solution; under a nitrogen atmosphere, place 30 g of amino-modified hollow glass microspheres and 4.5 g of 2,2-dimethylolpropionic acid in 700 mL of N,N-dimethylformamide, then heat to 145 °C while stirring, slowly dropwise add the mixed solution, continue stirring for 4.5 h after the addition, perform ultrasonic treatment while stirring, and the power of the ultrasonic treatment is 600 W; then filter, wash with N,N-dimethylformamide, and dry to obtain modified hollow glass microspheres.

[0062] Preparation Example 4:

[0063] A method for preparing silica sol, comprising the following steps:

[0064] Add ammonia water to the ethanol / water mixed solution, stir and mix, then dropwise add tetraethoxysilane, and continue stirring for 4.5 h after the addition to obtain silica sol; the volume ratio of the ethanol / water mixed solution, ammonia water, and tetraethoxysilane is 100 : 1 : 8.5; in the ethanol / water mixed solution, the volume ratio of water and ethanol is 1 : 3.

[0065] Preparation Example 5:

[0066] A method for preparing silica sol, comprising the following steps:

[0067] Add ammonia water to the ethanol / water mixed solution, stir and mix, then dropwise add tetraethoxysilane, and continue stirring for 3.5 h after the addition to obtain silica sol; the volume ratio of the ethanol / water mixed solution, ammonia water, and tetraethoxysilane is 100 : 1.1 : 9.5; in the ethanol / water mixed solution, the volume ratio of water and ethanol is 1 : 3.5.

[0068] Preparation Example 6:

[0069] A method for preparing silane coupling agent-modified short basalt fibers, comprising the following steps:

[0070] Add 1.3 g of silane coupling agent KH550 to 150 mL of ethanol / water mixture. After stirring and mixing, add 22 g of basalt chopped fibers with a length of 200 - 500 μm, stir and mix for 8 h, then filter, wash with water, and dry to obtain silane coupling agent-modified basalt chopped fibers. In the ethanol / water mixture, the volume ratio of water to ethanol is 1:1.5.

[0071] Preparation Example 7:

[0072] A preparation method of silane coupling agent-modified basalt chopped fibers, comprising the following steps:

[0073] Add 1 g of silane coupling agent KH560 to 100 mL of ethanol / water mixture. After stirring and mixing, add 20 g of basalt chopped fibers with a length of 200 - 500 μm, stir and mix for 10 h, then filter, wash with water, and dry to obtain silane coupling agent-modified basalt chopped fibers. In the ethanol / water mixture, the volume ratio of water to ethanol is 1:1.8.

[0074] Preparation Example 8:

[0075] A preparation method of silane coupling agent-modified basalt chopped fibers, comprising the following steps:

[0076] Add 1.2 g of silane coupling agent KH550 to 120 mL of ethanol / water mixture. After stirring and mixing, add 25 g of basalt chopped fibers with a length of 200 - 500 μm, stir and mix for 6 h, then filter, wash with water, and dry to obtain silane coupling agent-modified basalt chopped fibers. In the ethanol / water mixture, the volume ratio of water to ethanol is 1:2.

[0077] Example 1

[0078] A traffic sign reflective paint, which includes a reflective topcoat and a primer;

[0079] The reflective topcoat includes the following raw materials in parts by weight: 45 parts of pure acrylic emulsion, 18 parts of modified hollow glass microspheres, 12 parts of silica sol, 6 parts of titanium dioxide, 3.5 parts of silane coupling agent-modified basalt chopped fibers, 0.3 part of hydroxyethyl cellulose, 0.3 part of ultraviolet absorber UV-5050, 3 parts of thixotropic agent, 0.5 part of defoamer BYK-028, 0.2 part of dispersant BYK-190, 12 parts of water, and 3.5 parts of iron oxide yellow.

[0080] The primer comprises the following raw materials in parts by weight: 50 parts of pure acrylic emulsion, 10 parts of silica sol, 12 parts of light calcium carbonate (with a particle size of 200 - 300 mesh), 2 parts of silane coupling agent modified basalt short cut fibers, 1 part of hydroxyethyl cellulose, 0.2 part of ultraviolet absorber UV - 5050, 2 parts of thixotropic agent, 0.35 part of defoaming agent BYK - 028, 0.2 part of dispersant BYK - 190, 6 parts of water, and 3 parts of iron oxide yellow.

[0081] The solid content of the pure acrylic emulsion used above is 40%; the modified hollow glass microspheres are prepared by the method in Preparation Example 1; the silica sol is prepared by the method in Preparation Example 4; the silane coupling agent modified basalt short cut fibers are prepared by the method in Preparation Example 6; the thixotropic agent is composed of fumed silica and polyamide wax mixed in a mass ratio of 1:0.3.

[0082] In this embodiment, the preparation method of the reflective topcoat comprises the following steps: Weigh each raw material of the reflective topcoat according to the ratio; stir and mix the pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 30 min, then add the modified hollow glass microspheres and the silane coupling agent modified basalt short cut fibers, stir and mix for 12 min, and then add the remaining raw materials, stir and mix for 5 min to obtain the product.

[0083] The preparation method of the primer comprises the following steps: Weigh each raw material of the primer according to the ratio; stir and mix the pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 30 min, then add the light calcium carbonate and the silane coupling agent modified basalt short cut fibers, stir and mix for 10 min, and then add the remaining raw materials, stir and mix for 5 min to obtain the product.

[0084] Example 2

[0085] A traffic sign reflective paint, which comprises a reflective topcoat and a primer;

[0086] The reflective topcoat comprises the following raw materials in parts by weight: 50 parts of pure acrylic emulsion, 16 parts of modified hollow glass microspheres, 13 parts of silica sol, 8 parts of titanium dioxide, 3.5 parts of silane coupling agent modified basalt short cut fibers, 0.3 part of hydroxyethyl cellulose, 0.2 part of ultraviolet absorber UV - 5050, 2.5 parts of thixotropic agent, 0.5 part of defoaming agent BYK - 025, 0.3 part of dispersant BYK - 190, and 10 parts of water.

[0087] The primer comprises the following raw materials in parts by weight: 55 parts of pure acrylic emulsion, 12 parts of silica sol, 10 parts of light calcium carbonate (with a particle size of 200 - 300 mesh), 2 parts of silane coupling agent modified basalt short cut fibers, 0.5 part of hydroxyethyl cellulose, 0.2 part of ultraviolet absorber UV - 5050, 1.5 parts of thixotropic agent, 0.2 part of defoaming agent BYK - 025, 0.3 part of dispersant BYK - 190, and 10 parts of water.

[0088] The solid content of the pure acrylic emulsion used above is 40%; the modified hollow glass microspheres are prepared by the method in Preparation Example 2; the silica sol is prepared by the method in Preparation Example 5; the silane coupling agent-modified basalt chopped fibers are prepared by the method in Preparation Example 7; the thixotropic agent is composed of fumed silica and polyamide wax mixed in a mass ratio of 1:0.2.

[0089] The preparation method of the traffic sign reflective paint in this embodiment, wherein the preparation method of the reflective topcoat includes the following steps: weighing each raw material according to the ratio; stirring and mixing the pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 20 min, then adding the modified hollow glass microspheres and the silane coupling agent-modified basalt chopped fibers, stirring and mixing for 15 min, and then adding the remaining raw materials, stirring and mixing for 10 min to obtain.

[0090] The preparation method of the primer includes the following steps: weighing each raw material of the primer according to the ratio; stirring and mixing the pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 20 min, then adding the light calcium carbonate and the silane coupling agent-modified basalt chopped fibers, stirring and mixing for 10 min, and then adding the remaining raw materials, stirring and mixing for 10 min to obtain.

[0091] Example 3

[0092] A traffic sign reflective paint, the traffic sign reflective paint includes a reflective topcoat and a primer;

[0093] The reflective topcoat includes the following raw materials in parts by weight: 45 parts of pure acrylic emulsion, 18 parts of modified hollow glass microspheres, 10 parts of silica sol, 6 parts of titanium dioxide, 3 parts of silane coupling agent-modified basalt chopped fibers, 0.5 part of hydroxyethyl cellulose, 0.1 part of ultraviolet absorber UV-5050, 1.5 parts of thixotropic agent, 0.3 part of defoamer BYK-025, 0.4 part of dispersant BYK-191, 15 parts of water, and 3 parts of iron oxide yellow.

[0094] The primer includes the following raw materials in parts by weight: 50 parts of pure acrylic emulsion, 15 parts of silica sol, 10 parts of light calcium carbonate (particle size of 200-300 mesh), 3 parts of silane coupling agent-modified basalt chopped fibers, 0.6 part of hydroxyethyl cellulose, 0.1 part of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.3 part of defoamer BYK-025, 0.2 part of dispersant BYK-191, 8 parts of water, and 2 parts of iron oxide yellow.

[0095] The solid content of the pure acrylic emulsion used above is 43%; the modified hollow glass microspheres are prepared by the method in Preparation Example 3; the silica sol is prepared by the method in Preparation Example 4; the silane coupling agent-modified basalt chopped fibers are prepared by the method in Preparation Example 6; the thixotropic agent is composed of fumed silica and polyamide wax mixed in a mass ratio of 1:0.5.

[0096] The preparation method of the traffic sign reflective paint in this embodiment, wherein the preparation method of the reflective topcoat includes the following steps: Weigh each raw material according to the ratio; Stir and mix the pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 25 minutes, then add the modified hollow glass microspheres and the basalt short cut fibers modified by silane coupling agent, stir and mix for 10 minutes, and then add the remaining raw materials, stir and mix for 10 minutes to obtain.

[0097] The preparation method of the primer includes the following steps: Weigh each raw material of the primer according to the ratio; Stir and mix the pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 25 minutes, then add the light calcium carbonate and the basalt short cut fibers modified by silane coupling agent, stir and mix for 8 minutes, and then add the remaining raw materials, stir and mix for 8 minutes to obtain.

[0098] Example 4

[0099] A traffic sign reflective paint, which includes a reflective topcoat and a primer;

[0100] The reflective topcoat includes the following raw materials in parts by weight: 40 parts of pure acrylic emulsion, 20 parts of modified hollow glass microspheres, 15 parts of silica sol, 10 parts of titanium dioxide, 2.5 parts of basalt short cut fibers modified by silane coupling agent, 0.5 part of hydroxyethyl cellulose, 0.3 part of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.6 part of defoamer BYK-025, 0.3 part of dispersant BYK-190, 12 parts of water, and 5 parts of iron oxide yellow.

[0101] The primer includes the following raw materials in parts by weight: 60 parts of pure acrylic emulsion, 15 parts of silica sol, 13 parts of light calcium carbonate (particle size of 200-300 mesh), 2 parts of basalt short cut fibers modified by silane coupling agent, 1 part of hydroxyethyl cellulose, 0.3 part of ultraviolet absorber UV-5050, 2.5 parts of thixotropic agent, 0.5 part of defoamer BYK-025, 0.4 part of dispersant BYK-190, 9 parts of water, and 4 parts of iron oxide yellow.

[0102] The solid content of the above-mentioned pure acrylic emulsion is 38%; the modified hollow glass microspheres are prepared by the method in Preparation Example 1; the silica sol is prepared by the method in Preparation Example 5; the basalt short cut fibers modified by silane coupling agent are prepared by the method in Preparation Example 8; the thixotropic agent is composed of fumed silica and polyamide wax mixed in a mass ratio of 1:0.3.

[0103] The preparation methods of the reflective topcoat and the primer in the traffic sign reflective paint of this embodiment are the same as those in Example 1.

[0104] Example 5

[0105] A traffic sign reflective paint, which includes a reflective topcoat and a primer;

[0106] The reflective topcoat comprises the following raw materials in parts by weight: 42 parts of pure acrylic emulsion, 20 parts of modified hollow glass microspheres, 15 parts of silica sol, 8 parts of titanium dioxide, 3.2 parts of silane coupling agent modified basalt short cut fibers, 0.6 part of hydroxyethyl cellulose, 0.2 part of ultraviolet absorber UV-5050, 2.5 parts of thixotropic agent, 0.5 part of defoamer BYK-025, 0.3 part of dispersant BYK-191, 13 parts of water, and 3.5 parts of iron oxide yellow.

[0107] The primer comprises the following raw materials in parts by weight: 60 parts of pure acrylic emulsion, 13 parts of silica sol, 12 parts of light calcium carbonate (particle size 200 - 300 mesh), 2.5 parts of silane coupling agent modified basalt short cut fibers, 0.5 part of hydroxyethyl cellulose, 0.3 part of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.2 part of defoamer BYK-025, 0.2 part of dispersant BYK-191, and 6 parts of water.

[0108] The solid content of the pure acrylic emulsion used above is 38%; the modified hollow glass microspheres are prepared by the method in Preparation Example 2; the silica sol is prepared by the method in Preparation Example 4; the silane coupling agent modified basalt short cut fibers are prepared by the method in Preparation Example 6; the thixotropic agent is composed of fumed silica and polyamide wax mixed in a mass ratio of 1:0.3.

[0109] The preparation methods of the reflective topcoat and the primer in the traffic sign reflective paint of this example are the same as those in Example 3.

[0110] Example 6

[0111] A traffic sign reflective paint, which includes a reflective topcoat and a primer;

[0112] The reflective topcoat comprises the following raw materials in parts by weight: 49 parts of pure acrylic emulsion, 16 parts of modified hollow glass microspheres, 12 parts of silica sol, 9 parts of titanium dioxide, 3.5 parts of silane coupling agent modified basalt short cut fibers, 0.5 part of hydroxyethyl cellulose, 0.2 part of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.6 part of defoamer BYK-028, 0.4 part of dispersant BYK-191, 12 parts of water, and 4.5 parts of iron oxide yellow.

[0113] The primer comprises the following raw materials in parts by weight: 55 parts of pure acrylic emulsion, 15 parts of silica sol, 10 parts of light calcium carbonate (particle size 200 - 300 mesh), 2 parts of silane coupling agent modified basalt short cut fibers, 0.7 part of hydroxyethyl cellulose, 0.3 part of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.3 part of defoamer BYK-028, 0.3 part of dispersant BYK-191, 7 parts of water, and 2.5 parts of iron oxide yellow.

[0114] The solid content of the pure acrylic emulsion used above is 40%; the modified hollow glass microspheres are prepared by the method in Preparation Example 2; the silica sol is prepared by the method in Preparation Example 5; the silane coupling agent-modified basalt chopped fibers are prepared by the method in Preparation Example 8; the thixotropic agent is composed of fumed silica and polyamide wax mixed at a mass ratio of 1:0.3.

[0115] In this example, the preparation methods of the reflective topcoat and the primer of the traffic sign reflective paint are the same as those in Example 2.

[0116] Example 7

[0117] An apparatus for implementing the preparation method of the traffic sign reflective paint in Examples 1-6, the apparatus includes a stirring tank 1, a tank cover 2 is installed on the stirring tank 1, and a vertically arranged stirring rod 3 is arranged in the stirring tank 1; a driving device 4 is installed on the tank cover 2, the output shaft of the driving device 4 passes through the tank cover 2 and is rotatably connected with the tank cover 2 in a sealed manner, and the bottom end of the output shaft of the driving device 4 is fixedly connected with the top end of the stirring rod 3 through a coupling; specifically, the driving device 4 includes a motor and a reducer, the output shaft of the motor is connected to the reducer, and the output shaft of the reducer is fixedly connected with the top end of the stirring rod 3 through a coupling.

[0118] Two stirring blades 5 are installed on both sides of the lower end of the stirring rod 3, the stirring blades 5 are fan-shaped and obliquely arranged relative to the stirring rod 3, and the end with a smaller cross-section of the stirring blade 5 is fixedly connected with the stirring rod 3; the tank cover 2 is communicated with a feed port 6, and a feed port cover is installed on the feed port 6; the bottom of the stirring tank 1 is communicated with a discharge pipe 7, and a discharge valve is installed on the discharge pipe 7.

[0119] When using the above apparatus to prepare the traffic sign reflective paint, specifically when preparing the reflective topcoat, first pour the film-forming emulsion, silica sol, and hydroxyethyl cellulose into the stirring tank 1 through the feed port 6, stir and mix, then add the modified hollow glass microspheres and the silane coupling agent-modified basalt chopped fibers, stir and mix, then add the remaining raw materials, stir and mix, and then export the obtained traffic sign reflective paint from the discharge pipe 7.

[0120] Comparative Example 1

[0121] Different from Example 6, the modified hollow glass microspheres are replaced with hollow glass microspheres with a particle size of 20-60 μm.

[0122] Comparative Example 2

[0123] Different from Example 6, the silane coupling agent-modified basalt chopped fibers are not added to both the reflective topcoat and the primer.

[0124] Performance test:

[0125] 1. When preparing the paint film, first apply the primer in the examples and comparative examples on the substrate, and dry it to form the bottom paint film. Then spray the reflective topcoat on the bottom paint film and dry it to form the surface paint film. Then, according to the standard of GB / T 1732-2020, measure the impact resistance of the paint film; according to the standard of GB / T 5210-2006, measure the adhesion of the paint film. The specific test results are shown in Table 1.

[0126] Table 1:

[0127]

[0128] As can be seen from Table 1, the paint films corresponding to the reflective paints in Examples 1-6 of the present invention all have excellent impact resistance and adhesion. By comparing Example 6 with Comparative Examples 1-2, it can be seen that if the hollow glass microspheres are not modified and the silane coupling agent-modified basalt chopped fibers are not added to the paint, it will cause a significant decrease in the impact resistance of the paint film and a certain decrease in the adhesion.

[0129] 2. According to the standard of GB / T14522-2008, measure the artificial weathering resistance (1000h) of the paint film; according to the standard of GB / T1740-2007, measure the damp heat resistance (1000h) of the paint film. The specific test results are shown in Table 2.

[0130] Table 2:

[0131]

[0132] As can be seen from Table 2, the paint films corresponding to the reflective paints in Examples 1-6 of the present invention all have excellent aging resistance and damp heat resistance, and can make the prepared traffic signs permanently maintain a good warning effect. By comparing Example 6 with Comparative Examples 1-2, it can be seen that if the hollow glass microspheres are not modified and the silane coupling agent-modified basalt chopped fibers are not added to the paint, it will cause a significant decrease in both the aging resistance and the damp heat resistance of the paint film.

[0133] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A traffic sign reflective paint, characterized in that, The traffic sign reflective paint described above includes a reflective topcoat; The reflective topcoat includes the following raw materials in parts by weight: 40 - 50 parts of film-forming emulsion, 16 - 20 parts of modified hollow glass microspheres, 10 - 15 parts of silica sol, 6 - 10 parts of titanium dioxide, 2.5 - 3.5 parts of silane coupling agent-modified basalt short fibers, 0.3 - 0.6 parts of hydroxyethyl cellulose, 0.1 - 0.3 parts of ultraviolet absorber, 1.5 - 3 parts of thixotropic agent, 0.3 - 0.6 parts of defoamer, 0.2 - 0.4 parts of dispersant, 10 - 15 parts of water, and 0 - 5 parts of pigment; The traffic sign reflective paint also includes a primer, and the primer includes the following raw materials in parts by weight: 50 - 60 parts of film-forming emulsion, 10 - 15 parts of silica sol, 10 - 13 parts of light calcium carbonate, 2 - 3 parts of silane coupling agent-modified basalt short fibers, 0.5 - 1 parts of hydroxyethyl cellulose, 0.1 - 0.3 parts of ultraviolet absorber, 1.5 - 2.5 parts of thixotropic agent, 0.2 - 0.5 parts of defoamer, 0.2 - 0.4 parts of dispersant, 6 - 10 parts of water, and 0 - 4 parts of pigment; The film-forming emulsion is a pure acrylic emulsion; The preparation method of the modified hollow glass microspheres includes the following steps: 1) Add hollow glass microspheres and amino silane coupling agent to ethanol, heat to 70 - 75 °C while stirring, and keep stirring at a constant temperature for 7 - 10 h under a nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres; the particle size of the hollow glass microspheres is 20 - 60 μm; the mass-volume ratio of the hollow glass microspheres, amino silane coupling agent, and ethanol is 10 - 15 g: 3 - 5 g: 70 - 100 mL; the amino silane coupling agent includes one or more of KH540 and KH550; 2) Dissolve neopentyl glycol and p-toluenesulfonic acid in N,N-dimethylformamide to obtain a mixed solution; under a nitrogen atmosphere, place the amino-modified hollow glass microspheres and 2,2-dimethylolpropionic acid in N,N-dimethylformamide, then heat to 140 - 150 °C while stirring, and slowly dropwise add the mixed solution. After the addition is completed, continue stirring for 4 - 5 h, and perform ultrasonic treatment while stirring; then filter, wash with N,N-dimethylformamide, and dry to obtain modified hollow glass microspheres; the mass ratio of the amino-modified hollow microspheres, 2,2-dimethylolpropionic acid, neopentyl glycol, and p-toluenesulfonic acid is 30: 3 - 4.5: 2 - 3: 0.02 - 0.04; the power of the ultrasonic treatment is 300 - 600 W.

2. The traffic sign reflective paint according to claim 1, characterized in that, The preparation method of the silane coupling agent-modified basalt short fibers includes the following steps: Add a silane coupling agent to an ethanol / water mixed solution, stir and mix, then add basalt short fibers with a length of 200 - 500 μm, stir and mix for 6 - 10 h, and then filter, wash with water, and dry to obtain the silane coupling agent-modified basalt short fibers; The mass-volume ratio of the ethanol / water mixed solution, silane coupling agent, and basalt short fibers is 100 - 150 mL: 1 - 1.3 g: 20 - 25 g; In the ethanol / water mixed solution, the volume ratio of water to ethanol is 1: 1.5 - 2; The silane coupling agent is at least one of KH550 and KH560.

3. The traffic sign reflective paint according to claim 1, wherein The preparation method of the silica sol includes the following steps: Add ammonia water to the ethanol / water mixture, stir and mix, then dropwise add tetraethoxysilane. After the addition is completed, continue stirring for 3.5 - 4.5 h to obtain the silica sol; The volume ratio of the ethanol / water mixture, ammonia water, and tetraethoxysilane is 100:1 - 1.1:8.5 - 9.5; In the ethanol / water mixture, the volume ratio of water to ethanol is 1:3 - 3.

5.

4. The traffic sign reflective paint according to claim 1, characterized in that, The solid content of the pure acrylic emulsion is 38 - 43%; The ultraviolet absorber is ultraviolet absorber UV-5050; The thixotropic agent is composed of fumed silica and polyamide wax mixed in a mass ratio of 1:0.2 - 0.5; The defoamer is BYK-025 or BYK-028; The dispersant is BYK-190 or BYK-191.

5. The traffic sign reflective paint according to claim 1, characterized in that, The particle size of the light calcium carbonate is 200 - 300 mesh.

6. A method for preparing a traffic sign reflective paint as described in any one of claims 1-5, characterized in that, It includes the following steps: Weigh each raw material according to the ratio; stir and mix the film-forming emulsion, silica sol, and hydroxyethyl cellulose for 20 - 30 min, then add the modified hollow glass microspheres and the silane coupling agent-modified basalt chopped fibers, stir and mix for 10 - 15 min, and then add the remaining raw materials, stir and mix for 5 - 10 min to obtain.

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