CN1141323A - Coating composition for making retro-reflective coating, coating produced and application of the coating - Google Patents

Abstract

A coating composition for use with glass beads for making retroreflective coatings is disclosed. The composition comprises 20 to 75% by weight of a film-forming agent having a transparency of 25 to 95% and a refractive index of 1.4 to 1.6, 5 to 50% by weight of a pigment having a reflectance of 30 to 90%, and 20 to 60% by weight of a solvent, based on the total weight of the composition. If necessary, 0.5 to 10% by weight of a coupling agent is further contained. The refractive index of the glass beads used in combination is 1.5-2.3, and the particle size is 20-500 μm. The glass beads are adhered and embedded on the surface layer of the paint film formed after the coating of the coating composition, and the reflection coefficient of the obtained retro-reflective coating is within the range of 5-180. The coating is especially suitable for making retro-reflective signs such as magnified characters and/or patterns on high-speed moving objects such as vehicles with complex surface shapes.

Description

Coating compositions for making retroreflective coatings and the coatings produced and applications of the coatings

The invention relates to a coating composition used in conjunction with glass microspheres for making retroreflective coatings. The invention also relates to the retroreflective coating made by using the coating composition and the glass microspheres and the application of the prepared retroreflective coating.

Hitherto, various reflective materials are known. Reflective film is one of them. According to the reflective coefficient R value to classify, the known reflective film is divided into engineering grade reflective film (reflective coefficient R value is 15 ~ 100), high strength reflective film (R value is 100 ~ 250), and diamond grade reflective film ( R value greater than 600). However, the reflective film needs to be spliced and pasted with self-adhesive after cutting and engraving to make various characters and/or patterns, so the manufacturing process is complicated, the cost is high, and the bonding effect is poor. In particular, reflective film cannot be pasted on surfaces with complex shapes. Another type of reflective material available is road marking paint. It goes without saying that the paint is easy to coat on complex-shaped surfaces, making it easy to make reflective characters and/or reflective patterns, and the manufacturing process is much simpler than using reflective film materials. What's more, the reflective coating can make color patterns and/or characters more easily than reflective film materials. But, so far, known road marking paints with retro-reflective (retro-reflective) effect, the reflectance coefficient R value of the paint film is all less than 5, which cannot meet the requirements of the reflective performance on motor vehicles to reach or approach the above-mentioned requirements. Engineering grade (R=15~100) requirements. What's more, there has been no report on reflective coatings whose reflective performance is close to that of engineering-grade reflective films.

Therefore, the purpose of the present invention is to overcome the disadvantages of high cost of reflective film materials, complicated manufacturing process of characters and/or patterns, and inability to make characters and/or patterns (especially more complicated color patterns) on complex-shaped surfaces, and provide a kind of Not only retroreflective characters and/or patterns can be made on a flat surface, but also a coating composition for making retroreflective characters and/or patterns (especially complex color patterns) on complex-shaped surfaces.

The above object of the present invention is achieved by providing a coating composition, which contains a film forming agent, a pigment and a solvent, and is characterized in that, based on its total weight, the coating composition contains 20-75% (weight) film-forming agent with transparency of 25-95% and refractive index of 1.4-1.6, 5-50% (weight) of pigment with reflectivity of 30-90%, and 20-60% (weight) of coating solvent.

In the coating composition of the present invention, any film-forming agent with a transparency of 25-95% and a refractive index n of 1.4-1.6 can be used, and its dosage is 20-75% of the total weight of the coating composition. Examples of suitable film formers are nitrocellulose, acrylic resins, polyurethane resins, phenolic resins, epoxy resins, and one or more of various synthetic rubbers including chlorinated rubber, neoprene, and styrene-butadiene rubber. Various film formers. Under the premise of the transparency and refractive index specified above, the film-forming agent can be selected according to factors such as acid resistance, alkali resistance, weather resistance and abrasion resistance.

As for the pigments, the coating composition of the present invention must use pigments with a reflectance in the range of 30-90%, and the amount thereof is 5-50% of the total weight of the coating composition. Specifically, white pigments such as titanium dioxide can be used; inorganic mineral pigments including mica, quartz and silica can also be used; An organic or inorganic color pigment of a harmonic color or a transitional color. Examples of other suitable pigments include various alcohol-soluble dyes, most inorganic pearlescent pigments, organic pearlescent pigments, and metallic pigments such as copper, aluminum, silver, gold, titanium, nickel, chromium and other metal fine particles. In order to obtain various transitional colors or blending colors, different proportion mixtures of the above-mentioned various pigments can be used.

In the coating composition of the present invention, the solvents used are conventional coating solvents. It accounts for 20-60% of the total weight of the coating composition of the present invention. Examples of suitable solvents include toluene, xylene, ethyl acetate, cyclohexanone, and No. 120-200 solvent naphtha or a mixture of one or more of the above-mentioned solvents.

In order to accelerate the curing of certain film-forming agents, the coating composition of the present invention may also contain commonly used coupling agents, such as lead-manganese-cobalt coupling agents. Its content is 0.5-10% of the total weight of the coating composition of the present invention.

The glass microspheres used in conjunction with the coating composition of the present invention have a refractive index of 1.5-2.3 and a particle size of 20-500 μm.

According to another aspect of the present invention, the present invention also provides a retro-reflective coating made of the coating composition of the present invention and glass beads, characterized in that the glass beads are adhered and embedded in the coating of the present invention For the surface layer of the paint film formed after the composition is coated, the glass microspheres used together have a refractive index of 1.5-2.3 and a particle size of 20-500 μm, and the reflectance coefficient of the prepared coating is in the range of 5-180. In order to ensure that the reflective coefficient of the retroreflective coating of the present invention is near the upper limit of the above-mentioned range, it is preferable to carry out local surface metallization treatment on the glass beads, such as vacuum aluminum plating, so that the hemispherical surface of the glass beads is formed as high as 90-96. % reflectivity, so that the R value of the prepared retro-reflective coating is within the range of 100-180.

According to yet another aspect of the present invention, the coating composition of the present invention cooperates with glass microspheres to produce a retro-reflective coating with a high reflective coefficient R value, which provides for making enlarged characters and/or patterns on high-speed moving objects, such as motor vehicles and ships. Such as returning to the application of reflective signs. In addition, because the present invention can produce various more complex color retro-reflective patterns and/or characters, so the coating composition of the present invention and the retro-reflective coating of the present invention also provide a variety of bright, eye-catching emblems. , service signs and advertising graphics applications.

Since the coating composition provided by the present invention can match the glass microspheres optically, it provides the possibility of making a retroreflective coating with a reflective coefficient R value in the range of 5 to 180, so the present invention overcomes the existing problems. In the prior art, the disadvantages of high cost of reflective film material, complicated manufacturing process of characters and/or patterns, and inability to make characters and/or patterns (especially complex color patterns) on the surface of complex shapes provide a method that can even be used in complex shapes. On the surface, a retro-reflective coating with a high reflective coefficient R value can be made with low cost and simple manufacturing process, so that retro-reflective signs such as enlarged characters and/or patterns can be made on high-speed moving objects, such as motor vehicles and ships. Traffic management and traffic safety play a considerable role. In addition, since various characters and/or patterns with retro-reflective properties can be produced according to the present invention, especially complex color retro-reflective patterns, the coating composition provided by the present invention can also be used to make various bright and eye-catching retro-reflective patterns. Emblems, service signs and advertising graphics, it goes without saying that the application of the coating composition of the present invention in these areas will greatly change the appearance of cities and towns.

The following examples are used to illustrate the present invention in detail, but these examples are by no means intended to limit the protection scope of the present invention.

Example 1

Based on the total weight of the coating composition of the present invention, take 40% (weight) alkyd resin varnish with a solid content of 45% (weight), 1% (weight) lead-manganese-cobalt coupling agent, 40% (weight) A mixed solvent composed of xylene and No. 200 solvent gasoline, and 19% (weight) aluminum powder slurry (metallic pigment) are evenly mixed to make a coating composition of the present invention, and the prepared coating composition is loaded with In a spray can (A) of a propane-butane mixture. In addition, the glass microspheres and the solvent are uniformly mixed at a ratio of 15% (weight) and 85% (weight), and loaded into a spray tank (B) containing propane-butane gas mixture. Use the spray can (A) to spray the coating composition prepared in this example on the substrate, and then use the spray can (B) to spray glass beads, so that the reflective coefficient R value of the retroreflective coating so prepared is 65.

Example 2

Based on the total weight of the coating composition of the present invention, take by weighing 70% (weight) solid content of 30% neoprene slurry, 10% (weight) titanium dioxide, 10% (weight) white pearlescent pigment and 10% ( weight) xylene solvent is evenly mixed to make a coating composition of the present invention. Evenly adhere the microbeads with n≥1.9 on the self-adhesive film, and after vacuum aluminizing treatment, transfer the microbeads to the paint film formed by coating the coating composition prepared in this example. The R-value of the retro-reflective coating reaches 180.

Example 3

Based on the total weight of the coating composition of the present invention, take by weighing 65% (weight) of chlorinated rubber liquid with a solid content of 40% (weight), 15% (weight) of chlorinated rubber liquid with a solid content of 65% (weight) Phenolic resin slurry, 15% (weight) aluminum powder slurry and 5% (weight) xylene are uniformly mixed to prepare a coating composition of the present invention. The paint composition is coated on the surface of the substrate to form a paint film, and then the glass microspheres with n being 1.9 are dry-sprayed on the paint film to obtain a retroreflective coating with R being 60.

Example 4

Based on the total weight of the coating composition of the present invention, take by weighing 60% (weight) one-component polyurethane varnish, 20% (weight) xylene and 20% (weight) pearlescent pigments with a particle size less than 20 μm. Mix evenly to make a sprayable glue of the present invention. The glass microspheres are sprayed onto the paint film formed by spraying the sprayable glue prepared in this embodiment with a carrier spray gas, or the glass microspheres are packed into a spray tank using propane-butane as an atomizer , spray glass beads with this spray can. The particle size of the glass microspheres used is 100 μm, and its n=1.8. The R value of the retroreflective coating thus prepared is all about 20.

Example 5

Based on the total weight of the coating composition of the present invention, take 70% (weight) solid content as the nitro varnish and 20% (weight) pearl powder, 10% (weight) mixed solvent (acetic acid) with a solid content of 45% (weight) Ethyl: butyl acetate: xylene=1:1:1, volume ratio), make it mix evenly, make a kind of coating composition of the present invention. Put the obtained coating composition into a spray tank using butane as a spray agent, and spray the coating composition prepared in this embodiment with this spray tank. Put microbeads with n≥1.7 and a particle size of 60 μm into a spray tank using butane as the spray agent, and use the spray tank to spray the glass microbeads onto the paint film formed by spraying the coating composition prepared in this example Above, the R value of the retro-reflective coating made in this way is ≥15.

Claims (12)

1. A coating composition used in conjunction with glass microspheres for making retro-reflective coatings, characterized in that, based on its total weight, the coating composition contains 20-75% (weight) transparency of 25 -95%, a film-forming agent with a refractive index of 1.4 to 1.6, 5 to 50% (weight) of a pigment with a reflectivity of 30 to 90%, and 20 to 60% (weight) of a coating solvent; the same as the coating composition The refractive index (n) of the glass microspheres used together is in the range of 1.5-2.3, and the particle size is in the range of 20-500 μm. 2. The coating composition for making retro-reflective coating according to claim 1, wherein said film-forming agent is selected from nitrocellulose, acrylic resin, polyurethane resin, phenolic resin, epoxy resin, natural rubber, and One or more film-forming agents in synthetic rubber including styrene-butadiene rubber and neoprene rubber. 3. The coating composition for making retro-reflective coatings according to claim 1, wherein the pigments are selected from titanium dioxide, inorganic mineral pigments including mica, quartz, and silica, including red and yellow pigments except black. , blue, green, silver white, golden yellow and various harmonic and transition colors of organic or inorganic color pigments, various alcohol-soluble dyes, inorganic pearlescent pigments, organic pearlescent pigments, and metal pigments including copper, aluminum, silver, gold, titanium , nickel, chromium metal fine particles, and mixtures of the above-mentioned various pigments in different proportions. 4. The coating composition for making retro-reflective coating according to claim 1, characterized in that, the solvent is selected from toluene, xylene, ethyl acetate, cyclohexanone and No. 120-200 solvent gasoline, or selected from A mixed solvent composed of one or more of the above solvents. 5. The coating composition for preparing retro-reflective coating according to any one of claims 1 to 4, characterized in that, based on its total weight, the coating composition also contains 0.5-10% (weight) of coupling agent. 6. The retro-reflective coating made by using the coating composition according to any one of claims 1 to 5 in conjunction with glass beads, characterized in that the glass beads are adhered and embedded in the coating composition In the surface layer of the paint film formed after coating, the refractive index of the glass microspheres is 1.5-2.3, the particle size is 20-500 μm, and the reflection coefficient of the coating is in the range of 5-180. 7. The retroreflective coating according to claim 6, characterized in that the surface of the glass beads is partially metallized to form a reflectivity as high as 90 to 96%, so as to ensure the reflection of the prepared retroreflective coating. The coefficient is near the upper limit of the above range, so that the R value of the retroreflective coating can be in the range of 100-180. 8. The retroreflective coating according to claim 7, characterized in that the surface of the glass microspheres is treated by partial vacuum aluminum plating. 9. The application of the coating composition according to any one of claims 1 to 5 and the retroreflective coating according to any one of claims 6 to 8 in making retroreflective enlarged characters and/or patterns. 10. The application according to claim 9, characterized in that retroreflective enlarged characters and/or patterns are made on high-speed transportation means including automobiles, trains and ships. 11. The application of the coating composition according to any one of claims 1 to 5 and the retroreflective coating according to any one of claims 6 to 8 in the production of over-color retroreflective enlarged characters and/or patterns. 12. The application as claimed in claim 11, characterized in that the enlarged characters and/or patterns of retroreflective chromatic amplification are emblems, service marks and advertising graphics.