Traffic sign reflective paint and preparation method and device thereof

Abstract

The invention provides traffic sign reflective paint as well as a preparation method and device thereof. The traffic sign reflective paint comprises reflective finish paint, the reflective finish paint is prepared from the following raw materials in parts by weight: 40 to 50 parts of film-forming emulsion, 16 to 20 parts of modified hollow glass beads, 10 to 15 parts of silica sol, 6 to 10 parts of titanium dioxide, 2.5 to 3.5 parts of silane coupling agent modified basalt chopped fiber, 0.3 to 0.6 part of hydroxyethyl cellulose, 0.1 to 0.3 part of ultraviolet light absorber, 1.5 to 3 parts of thixotropic agent, 0.3 to 0.6 part of defoaming agent, 0.2 to 0.4 part of dispersing agent, 10 to 15 parts of water and 0 to 5 parts of pigment; according to the traffic sign reflective paint, the hollow glass beads are good in dispersity, the binding force between the hollow glass beads and a reflective surface paint film is high, the reflective paint film is excellent in impact resistance and aging resistance, and a good warning effect can be kept for a long time.

Description

Technical Field

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

[0002] Traffic signs are facilities that use graphic symbols and text to convey specific information, manage traffic, indicate driving directions, and ensure smooth roads and driving safety. They mainly include warning signs, prohibition signs, instruction signs, guide signs, tourist area signs, road construction safety signs, etc. These signs play a vital role in ensuring the safety and smoothness of road traffic. They can provide drivers and pedestrians with timely and accurate information, help everyone understand road conditions, comply with traffic rules, and thus avoid traffic accidents.

[0003] At night or in low light conditions, traffic signs 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 to make correct driving decisions in a timely manner. At the same time, the strong reflective effect of reflective paint can attract the driver's attention and play a good warning role, especially in complex or dangerous traffic environments, such as bends, intersections, school areas, etc. The use of reflective paint can effectively reduce the incidence of traffic accidents.

[0004] When exposed to light, reflective paint can reflect light back along its original path through the hollow glass beads and other reflective materials inside it, thus creating an obvious reflective effect at night or in dimly lit environments.

[0005] However, in the current reflective paint, the dispersion of hollow glass beads is still not good enough, and the bonding force between the hollow glass beads and the reflective paint film is not strong enough, which will cause the paint film to crack easily when impacted by external force. After the reflective paint film is exposed to sunlight for a long time, the formation and development of cracks in the reflective paint film will be aggravated. Subsequently, the hollow glass beads may even peel off, thereby affecting the warning function of the traffic sign. Summary of the invention

[0006] The purpose of the present invention is to provide a traffic sign reflective paint and a preparation method and device thereof. The hollow glass microbeads in the traffic sign reflective paint have good dispersibility and strong bonding force with the reflective surface paint film. The reflective paint film has excellent impact resistance and aging resistance and can maintain a good warning effect for a long time.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A traffic sign reflective paint, the traffic sign reflective paint comprising a reflective topcoat; 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 silane coupling agent-modified basalt chopped 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.

[0008] Preferably, the traffic sign reflective paint also includes a primer, which 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 chopped 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 defoaming agent, 0.2-0.4 parts of dispersant, 6-10 parts of water, and 0-4 parts of pigment.

[0009] Preferably, the preparation method of the modified hollow glass microspheres comprises the following steps: 1) Add hollow glass microspheres and aminosilane coupling agent to ethanol, raise the temperature to 70-75°C while stirring, stir at constant temperature for 7-10 hours under nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres; 2) Dissolve neopentyl glycol and p-toluenesulfonic acid in N,N-dimethylformamide to obtain a mixed solution; place 3-amino-modified hollow glass microspheres and 2,2-dihydroxymethylpropionic acid in N,N-dimethylformamide under a nitrogen atmosphere, then heat the mixture to 140-150° C. while stirring, then slowly drop the mixed solution, continue stirring for 4-5 hours after the addition is completed, and perform ultrasonic treatment while stirring; then filter, wash with N,N-dimethylformamide, and dry to obtain modified hollow glass microspheres.

[0010] Preferably, in step 1), the particle size of the hollow glass microspheres is 20-60 μm; The mass volume ratio of the hollow glass microspheres, the aminosilane coupling agent, and the ethanol is 10-15 g: 3-5 g: 70-100 mL; the aminosilane coupling agent includes one or more of KH540 and KH550; In step 2), the mass ratio of the amino-modified hollow microspheres, 2,2-dihydroxymethylpropionic acid, neopentyl glycol, and p-toluenesulfonic acid is 30:3-4.5:2-3:0.02-0.04; and the power of the ultrasonic treatment is 300-600W.

[0011] Preferably, the preparation method of the silica sol comprises the following steps: 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; 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 mixed liquid, the volume ratio of water to ethanol is 1:3-3.5.

[0012] Preferably, the method for preparing the silane coupling agent modified basalt chopped fibers comprises the following steps: 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; 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; In the ethanol / water mixture, the volume ratio of water to ethanol is 1:1.5-2; The silane coupling agent is at least one of KH550 and KH560.

[0013] Preferably, the film-forming emulsion is a pure acrylic emulsion; 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.

[0014] Preferably, the particle size of the light calcium carbonate is 200-300 mesh.

[0015] The pigment of the present invention is generally a yellow pigment, and preferably, the pigment is iron oxide yellow.

[0016] 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 a ratio; stirring and mixing a film-forming emulsion, a silica sol, and a hydroxyethyl cellulose for 20-30 minutes, then adding modified hollow glass microspheres and silane coupling agent-modified basalt chopped fibers, stirring and mixing for 10-15 minutes, and then adding the remaining raw materials, stirring and mixing for 5-10 minutes to obtain the reflective paint.

[0017] As a general inventive concept, the present invention provides a device for implementing the above-mentioned preparation method, the device comprising a stirring tank, a tank cover is installed on the stirring tank, a stirring rod is arranged in the stirring tank; a driving device is installed on the tank cover, an output shaft of the driving device passes through the tank cover and is connected to the tank cover in a sealed rotation, and the bottom end of the output shaft of the driving device is fixedly connected to the top end of the stirring rod through a coupling; Two stirring blades are installed on both sides of the lower end of the stirring rod. The stirring blades are fan-shaped and are arranged obliquely relative to the stirring rod, and the end of the stirring blade with a smaller cross section is fixedly connected to the stirring rod; The tank cover is connected with a feed port, and a feed port cover is installed on the feed port; the bottom of the stirring tank is connected with a discharge pipe, and a discharge valve is installed on the discharge pipe.

[0018] The biggest difference between the device for preparing reflective paint for traffic signs of the present invention and the conventional stirring device lies in the setting of the stirring blades. The stirring blades are fan-shaped and arranged obliquely relative to the stirring rod, so that a larger vortex can be formed in the paint when preparing reflective paint for traffic signs, thereby enhancing the mixing effect between the raw materials.

[0019] The beneficial effects of the present invention are: Adding silane coupling agent modified basalt chopped fibers to the reflective topcoat and primer of the present invention can make the paint film less prone to damage and cracking when subjected to external force, and have higher aging resistance. In addition, the silane coupling agent modified basalt chopped fibers can have good dispersion in the paint film, can form a three-dimensional network structure in the paint film, and can inhibit the aggregation of hollow glass microbeads in the reflective paint film, so that the hollow glass microbeads maintain a high dispersion, and the uniformity and stability of the paint film are enhanced.

[0020] The modified hollow glass microspheres of the present invention are grafted with hyperbranched hydroxyl polyester resin, so that in the reflective topcoat, the surface has abundant hydroxyl groups, which significantly enhances the dispersion performance of the hollow glass microspheres and the binding force between the hollow glass microspheres and the paint film. Even after being impacted and exposed to sunlight for a long time, the hollow glass microspheres still have a strong binding force with the paint film, are not easy to loosen and will not peel off, and the anti-cracking performance of the reflective paint film is significantly enhanced, so that the reflective paint film can maintain an excellent warning effect for a long time.

[0021] In the reflective paint of the present invention, the reflective topcoat and the primer are formulated with a film-forming emulsion and a silica sol, which can, on the one hand, enhance the surface roughness of the paint film, which can enhance the physical fit 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 enhance the bonding force between the primer film and the traffic sign substrate, thereby enhancing the adhesion of the overall paint film; on the other hand, it will also enhance the bonding force between the hollow glass microspheres and the paint film.

[0022] The traffic sign reflective paint of the present invention includes not only a reflective topcoat but also a primer, which has a strong bonding force with the traffic sign substrate, thereby improving the adhesion between the paint film and the traffic sign substrate as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a schematic diagram of the structure of the device in Example 7 of the present invention; In the figure: 1. mixing tank; 2. tank cover; 3. stirring rod; 4. driving device; 5. stirring blade; 6. feed inlet; 7. discharge pipe. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Preparation Example 1: A method for preparing modified hollow glass microspheres comprises the following steps: 1) Add hollow glass microspheres with a particle size of 20-60 μm and aminosilane coupling agent KH540 to ethanol, raise the temperature to 75°C while stirring, and stir at a constant temperature for 7 hours under a nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres; The mass volume ratio of hollow glass microspheres, aminosilane coupling agent and ethanol is 12g:5g:80mL.

[0027] 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-dihydroxymethylpropionic acid in 600 mL of N,N-dimethylformamide, then heat the mixture to 140°C while stirring, and then slowly drop the mixed solution. After the addition is completed, continue stirring for 5 hours, and perform ultrasonic treatment while stirring. The power of the ultrasonic treatment is 500 W; then filter, wash with N,N-dimethylformamide, and dry to obtain modified hollow glass microspheres.

[0028] Preparation Example 2: A method for preparing modified hollow glass microspheres comprises the following steps: 1) Add hollow glass microspheres with a particle size of 20-60 μm and aminosilane coupling agent KH550 to ethanol, raise the temperature to 70°C while stirring, stir at a constant temperature for 10 hours under a nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres; The mass volume ratio of hollow glass microspheres, aminosilane coupling agent and ethanol is 10g:3g:70mL.

[0029] 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-dihydroxymethylpropionic acid in 600 mL of N,N-dimethylformamide, then heat the mixture to 150°C while stirring, and then slowly drop the mixed solution. After the addition is completed, continue stirring for 4 hours, and perform ultrasonic treatment while stirring. The power of the ultrasonic treatment is 300 W; then filter, wash with N,N-dimethylformamide, and dry to obtain modified hollow glass microspheres.

[0030] Preparation Example 3: A method for preparing modified hollow glass microspheres comprises the following steps: 1) Add hollow glass microspheres with a particle size of 20-60 μm and aminosilane coupling agent KH550 to ethanol, raise the temperature to 72°C while stirring, stir at a constant temperature for 8 hours under a nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres; The mass volume ratio of hollow glass microspheres, aminosilane coupling agent and ethanol is 15g:4:100mL.

[0031] 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-dihydroxymethylpropionic acid in 700 mL of N,N-dimethylformamide, then heat the mixture to 145°C while stirring, and then slowly drop the mixed solution. After the addition is completed, continue stirring for 4.5 hours, and perform ultrasonic treatment while stirring. The power of the ultrasonic treatment is 600 W; then filter, wash with N,N-dimethylformamide, and dry to obtain modified hollow glass microspheres.

[0032] Preparation Example 4: A method for preparing silica sol comprises the following steps: Add ammonia water to the ethanol / water mixture, stir to mix, and then drop tetraethoxysilane. After the addition is completed, continue stirring for 4.5 hours to obtain silica sol; the volume ratio of ethanol / water mixture, ammonia water, and tetraethoxysilane is 100:1:8.5; in the ethanol / water mixture, the volume ratio of water to ethanol is 1:3.

[0033] Preparation Example 5: A method for preparing silica sol comprises the following steps: Add ammonia water to the ethanol / water mixture, stir to mix, and then drop tetraethoxysilane. After the addition is completed, continue stirring for 3.5 hours to obtain silica sol; the volume ratio of ethanol / water mixture, ammonia water, and tetraethoxysilane is 100:1.1:9.5; in the ethanol / water mixture, the volume ratio of water to ethanol is 1:3.5.

[0034] Preparation Example 6: A method for preparing silane coupling agent modified basalt chopped fibers comprises the following steps: 1.3 g of silane coupling agent KH550 was added to 150 mL of ethanol / water mixture, and then 22 g of basalt chopped fibers with a length of 200-500 μm were added after stirring and mixing for 8 hours, and then filtered, washed with water, and dried to obtain silane coupling agent modified basalt chopped fibers. In the ethanol / water mixture, the volume ratio of water to ethanol was 1:1.5.

[0035] Preparation Example 7: A method for preparing silane coupling agent modified basalt chopped fibers comprises the following steps: Add 1g of silane coupling agent KH560 to 100mL of ethanol / water mixture, stir and mix, then add 20g of basalt chopped fibers with a length of 200-500μm, stir and mix for 10h, then filter, wash 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.

[0036] Preparation Example 8: A method for preparing silane coupling agent modified basalt chopped fibers comprises the following steps: 1.2 g of silane coupling agent KH550 was added to 120 mL of ethanol / water mixture, and then 25 g of basalt chopped fibers with a length of 200-500 μm were added after stirring and mixing for 6 hours, and then filtered, washed with water, and dried to obtain silane coupling agent modified basalt chopped fibers. In the ethanol / water mixture, the volume ratio of water to ethanol was 1:2.

[0037] Example 1 A traffic sign reflective paint, comprising a reflective topcoat and a primer; 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 parts of hydroxyethyl cellulose, 0.3 parts of ultraviolet absorber UV-5050, 3 parts of thixotropic agent, 0.5 parts of defoaming agent BYK-028, 0.2 parts of dispersant BYK-190, 12 parts of water, and 3.5 parts of yellow iron oxide.

[0038] The primer includes 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 (particle size is 200-300 mesh), 2 parts of silane coupling agent modified basalt chopped fibers, 1 part of hydroxyethyl cellulose, 0.2 parts of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.35 parts of defoaming agent BYK-028, 0.2 parts of dispersant BYK-190, 6 parts of water, and 3 parts of yellow iron oxide.

[0039] 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 chopped fibers are prepared by the method in Preparation Example 6; the thixotropic agent is a mixture of fumed silica and polyamide wax in a mass ratio of 1:0.3.

[0040] In this embodiment, the preparation method of the reflective topcoat includes the following steps: weighing the raw materials of the reflective topcoat according to the ratio; stirring and mixing the pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 30 minutes, then adding the modified hollow glass microspheres and the silane coupling agent modified basalt chopped fibers, stirring and mixing for 12 minutes, and then adding the remaining raw materials, stirring and mixing for 5 minutes.

[0041] The preparation method of the primer comprises the following steps: weighing the raw materials of the primer according to the ratio; stirring and mixing the pure acrylic emulsion, silica sol and hydroxyethyl cellulose for 30 minutes, then adding the light calcium carbonate silane coupling agent modified basalt chopped fibers, stirring and mixing for 10 minutes, and then adding the remaining raw materials, stirring and mixing for 5 minutes to obtain the primer.

[0042] Example 2 A traffic sign reflective paint, comprising a reflective topcoat and a primer; The reflective topcoat includes 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 chopped fibers, 0.3 parts of hydroxyethyl cellulose, 0.2 parts of ultraviolet absorber UV-5050, 2.5 parts of thixotropic agent, 0.5 parts of defoaming agent BYK-025, 0.3 parts of dispersant BYK-190, and 10 parts of water.

[0043] The primer includes 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 (particle size is 200-300 mesh), 2 parts of silane coupling agent modified basalt chopped fibers, 0.5 parts of hydroxyethyl cellulose, 0.2 parts of ultraviolet absorber UV-5050, 1.5 parts of thixotropic agent, 0.2 parts of defoaming agent BYK-025, 0.3 parts of dispersant BYK-190, and 10 parts of water.

[0044] 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; and the thixotropic agent is a mixture of fumed silica and polyamide wax in a mass ratio of 1:0.2.

[0045] The method for preparing the reflective paint for traffic signs in this embodiment, wherein the method for preparing the reflective topcoat comprises the following steps: weighing each raw material according to a ratio; stirring and mixing pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 20 minutes, then adding modified hollow glass microspheres and silane coupling agent modified basalt chopped fibers, stirring and mixing for 15 minutes, and then adding the remaining raw materials, stirring and mixing for 10 minutes to obtain the product.

[0046] The preparation method of the primer comprises the following steps: weighing various raw materials of the primer according to the ratio; stirring and mixing pure acrylic emulsion, silica sol and hydroxyethyl cellulose for 20 minutes, then adding light calcium carbonate silane coupling agent modified basalt chopped fibers, stirring and mixing for 10 minutes, and then adding the remaining raw materials, stirring and mixing for 10 minutes to obtain the primer.

[0047] Example 3 A traffic sign reflective paint, comprising a reflective topcoat and a primer; 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 parts of hydroxyethyl cellulose, 0.1 parts of ultraviolet absorber UV-5050, 1.5 parts of thixotropic agent, 0.3 parts of defoaming agent BYK-025, 0.4 parts of dispersant BYK-191, 15 parts of water, and 3 parts of yellow iron oxide.

[0048] 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 is 200-300 mesh), 3 parts of silane coupling agent modified basalt chopped fibers, 0.6 parts of hydroxyethyl cellulose, 0.1 parts of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.3 parts of defoaming agent BYK-025, 0.2 parts of dispersant BYK-191, 8 parts of water, and 2 parts of yellow iron oxide.

[0049] 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 a mixture of fumed silica and polyamide wax in a mass ratio of 1:0.5.

[0050] The method for preparing the reflective paint for traffic signs in this embodiment, wherein the method for preparing the reflective topcoat comprises the following steps: weighing each raw material according to a ratio; stirring and mixing pure acrylic emulsion, silica sol, and hydroxyethyl cellulose for 25 minutes, then adding modified hollow glass microspheres and silane coupling agent modified basalt chopped fibers, stirring and mixing for 10 minutes, and then adding the remaining raw materials, stirring and mixing for 10 minutes to obtain the product.

[0051] The preparation method of the primer comprises the following steps: weighing the raw materials of the primer according to the ratio; stirring and mixing the pure acrylic emulsion, silica sol and hydroxyethyl cellulose for 25 minutes, then adding the light calcium carbonate silane coupling agent modified basalt chopped fibers, stirring and mixing for 8 minutes, and then adding the remaining raw materials, stirring and mixing for 8 minutes to obtain the primer.

[0052] Example 4 A traffic sign reflective paint, comprising a reflective topcoat and a primer; 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 silane coupling agent modified basalt chopped fibers, 0.5 parts of hydroxyethyl cellulose, 0.3 parts of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.6 parts of defoaming agent BYK-025, 0.3 parts of dispersant BYK-190, 12 parts of water, and 5 parts of yellow iron oxide.

[0053] 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 is 200-300 mesh), 2 parts of silane coupling agent modified basalt chopped fibers, 1 part of hydroxyethyl cellulose, 0.3 parts of ultraviolet absorber UV-5050, 2.5 parts of thixotropic agent, 0.5 parts of defoaming agent BYK-025, 0.4 parts of dispersant BYK-190, 9 parts of water, and 4 parts of yellow iron oxide.

[0054] 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 1; 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 a mixture of fumed silica and polyamide wax in a mass ratio of 1:0.3.

[0055] The preparation method of the reflective topcoat and primer in the reflective paint for traffic signs in this embodiment is the same as that in Example 1.

[0056] Example 5 A traffic sign reflective paint, comprising a reflective topcoat and a primer; The reflective topcoat includes 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 chopped fibers, 0.6 parts of hydroxyethyl cellulose, 0.2 parts of ultraviolet absorber UV-5050, 2.5 parts of thixotropic agent, 0.5 parts of defoaming agent BYK-025, 0.3 parts of dispersant BYK-191, 13 parts of water, and 3.5 parts of yellow iron oxide.

[0057] The primer includes 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 is 200-300 mesh), 2.5 parts of silane coupling agent modified basalt chopped fibers, 0.5 parts of hydroxyethyl cellulose, 0.3 parts of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.2 parts of defoaming agent BYK-025, 0.2 parts of dispersant BYK-191, and 6 parts of water.

[0058] 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 chopped fibers are prepared by the method in Preparation Example 6; the thixotropic agent is a mixture of fumed silica and polyamide wax in a mass ratio of 1:0.3.

[0059] The preparation method of the reflective topcoat and primer in the reflective paint for traffic signs in this embodiment is the same as that in Example 3.

[0060] Example 6 A traffic sign reflective paint, comprising a reflective topcoat and a primer; The reflective topcoat includes 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 chopped fibers, 0.5 parts of hydroxyethyl cellulose, 0.2 parts of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.6 parts of defoaming agent BYK-028, 0.4 parts of dispersant BYK-191, 12 parts of water, and 4.5 parts of yellow iron oxide.

[0061] The primer includes 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 is 200-300 mesh), 2 parts of silane coupling agent modified basalt short fiber, 0.7 parts of hydroxyethyl cellulose, 0.3 parts of ultraviolet absorber UV-5050, 2 parts of thixotropic agent, 0.3 parts of defoaming agent BYK-028, 0.3 parts of dispersant BYK-191, 7 parts of water, and 2.5 parts of yellow iron oxide.

[0062] 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 a mixture of fumed silica and polyamide wax in a mass ratio of 1:0.3.

[0063] The preparation method of the reflective topcoat and primer in the reflective paint for traffic signs in this embodiment is the same as that in Example 2.

[0064] Example 7 A device for implementing the method for preparing reflective paint for traffic signs in Examples 1-6, the device comprises 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 sealed and rotatably connected to the tank cover 2, and the bottom end of the output shaft of the driving device 4 is fixedly connected to the top end of the stirring rod 3 through a coupling; specifically, the driving device 4 comprises 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 to the top end of the stirring rod 3 through a coupling.

[0065] 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 are arranged obliquely relative to the stirring rod 3, and the end of the stirring blade 5 with a smaller cross-section is fixedly connected to the stirring rod 3; the tank cover 2 is connected to a feed port 6, and a feed port cover is installed on the feed port 6; the bottom of the stirring tank 1 is connected to a discharge pipe 7, and a discharge valve is installed on the discharge pipe 7.

[0066] When the above-mentioned device is used to prepare reflective paint for traffic signs, specifically when preparing the reflective topcoat, the film-forming emulsion, silica sol, and hydroxyethyl cellulose are first poured into the stirring tank 1 through the material port 6, stirred and mixed, and then the modified hollow glass microspheres and silane coupling agent modified basalt chopped fibers are added, stirred and mixed, and then the remaining raw materials are added, stirred and mixed, and then the obtained traffic sign reflective paint is discharged from the discharge pipe 7.

[0067] Comparative Example 1 The difference from Example 6 is that the modified hollow glass microspheres are replaced with hollow glass microspheres with a particle size of 20-60 μm.

[0068] Comparative Example 2 Different from Example 6, no silane coupling agent-modified basalt chopped fibers are added to the reflective topcoat and primer.

[0069] Performance Test: 1. When preparing the paint film, the primer in the embodiment and the comparative example is first applied to the substrate and dried to form a bottom layer paint film, and then the reflective topcoat is sprayed on the bottom layer paint film and dried to form a surface layer paint film. Then, the impact resistance of the paint film is measured according to the standard of GB / T 1732-2020; the adhesion of the paint film is measured according to the standard of GB / T 5210-2006. The specific test results are shown in Table 1.

[0070] Table 1:

[0071] It can be seen from Table 1 that the paint films corresponding to the reflective paints in Examples 1-6 of the present invention all have excellent impact resistance and adhesion. However, by comparing Example 6 with Comparative Examples 1-2, it can be seen that if the hollow glass microbeads are not modified and the basalt chopped fibers modified by silane coupling agent are not added to the paint, the impact resistance of the paint film will be significantly reduced, and the adhesion will be reduced to a certain extent.

[0072] 2. The artificial weathering performance (1000h) of the paint film was measured according to the standard of GB / T14522-2008; the moisture and heat resistance (1000h) of the paint film was measured according to the standard of GB / T1740-2007. The specific test results are shown in Table 2.

[0073] Table 2:

[0074] As shown in Table 2, the paint films corresponding to the reflective paints in Examples 1-6 of the present invention all have excellent aging resistance and moisture and heat resistance, and can enable the prepared traffic signs to maintain a good warning effect for a long time. However, as shown in the comparison between Example 6 and Comparative Examples 1-2, if the hollow glass microspheres are not modified and the basalt chopped fibers modified by a silane coupling agent are not added to the paint, the aging resistance and moisture and heat resistance of the paint film will be significantly reduced.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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 includes a reflective topcoat; 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 silane coupling agent-modified basalt chopped 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.

2. The traffic sign reflective paint according to claim 1, characterized in that: The traffic sign reflective paint also includes a primer, which 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 defoaming agent, 0.2-0.4 parts of dispersant, 6-10 parts of water, and 0-4 parts of pigment.

3. The traffic sign reflective paint according to claim 1 or 2, characterized in that: The preparation method of the modified hollow glass microspheres comprises the following steps: 1) Add hollow glass microspheres and aminosilane coupling agent to ethanol, raise the temperature to 70-75°C while stirring, stir at constant temperature for 7-10 hours under nitrogen atmosphere, then filter, wash with ethanol, and dry to obtain amino-modified hollow glass microspheres; 2) Dissolve neopentyl glycol and p-toluenesulfonic acid in N,N-dimethylformamide to obtain a mixed solution; place amino-modified hollow glass microspheres and 2,2-dihydroxymethylpropionic acid in N,N-dimethylformamide under a nitrogen atmosphere, then heat the mixture to 140-150° C. while stirring, then slowly drop the mixed solution, continue stirring for 4-5 hours after the addition is completed, and perform ultrasonic treatment while stirring; then filter, wash with N,N-dimethylformamide, and dry to obtain modified hollow glass microspheres.

4. The traffic sign reflective paint as claimed in claim 3, characterized in that: In step 1), the particle size of the hollow glass microspheres is 20-60 μm; The mass volume ratio of the hollow glass microspheres, the aminosilane coupling agent, and the ethanol is 10-15 g: 3-5 g: 70-100 mL; the aminosilane coupling agent includes one or more of KH540 and KH550; In step 2), the mass ratio of the amino-modified hollow microspheres, 2,2-dihydroxymethylpropionic acid, neopentyl glycol, and p-toluenesulfonic acid is 30:3-4.5:2-3:0.02-0.04; and the power of the ultrasonic treatment is 300-600W.

5. The traffic sign reflective paint according to claim 1 or 2, characterized in that: The preparation method of the silica sol comprises the following steps: 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; 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 mixed liquid, the volume ratio of water to ethanol is 1:3-3.

5.

6. The traffic sign reflective paint according to claim 1 or 2, characterized in that: The preparation method of the silane coupling agent modified basalt chopped fibers comprises the following steps: 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; 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; In the ethanol / water mixture, the volume ratio of water to ethanol is 1:1.5-2; The silane coupling agent is at least one of KH550 and KH560.

7. The traffic sign reflective paint according to claim 1 or 2, characterized in that: The film-forming emulsion is a pure acrylic emulsion; 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.

8. The traffic sign reflective paint according to claim 2, characterized in that: The particle size of the light calcium carbonate is 200-300 meshes.

9. A method for preparing a traffic sign reflective paint as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following steps: weighing various raw materials according to the proportion; stirring and mixing the film-forming emulsion, silica sol and hydroxyethyl cellulose for 20-30 minutes, then adding the modified hollow glass microspheres and silane coupling agent modified basalt chopped fibers, stirring and mixing for 10-15 minutes, and then adding the remaining raw materials, stirring and mixing for 5-10 minutes to obtain the product.

10. A device for implementing the preparation method according to claim 9, characterized in that: The device comprises a stirring tank (1), the stirring tank (1) being provided with a tank cover (2), and a stirring rod (3) being arranged vertically in the stirring tank (1); a driving device (4) being provided on the tank cover (2), an output shaft of the driving device (4) passing through the tank cover (2) and being rotationally connected to the tank cover (2) in a sealed manner, and a bottom end of the output shaft of the driving device (4) being fixedly connected to a top end of the stirring rod (3) via a coupling; 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 are arranged obliquely relative to the stirring rod (3); and the end of the stirring blade (5) with a smaller cross section is fixedly connected to the stirring rod (3); The tank cover (2) is connected to a feed port (6), and a feed port cover is installed on the feed port (6); the bottom of the stirring tank (1) is connected to a discharge pipe (7), and a discharge valve is installed on the discharge pipe (7).

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