A weather-resistant anti-shedding road bead and its preparation method

Abstract

The present invention aims to provide a weather-resistant and anti-detachment road bead and its preparation method. The road bead is prepared from lead-free low-melting glass powder, pigments, ink oil, and glass beads through processes such as mixing, stirring, drying, sintering, and coating. Compared with traditional reflective beads, it has extremely strong adhesion, weather resistance, and temperature resistance. Therefore, a coating agent that is effectively suitable for improving the anti-fouling performance of road beads can be more widely selected, increasing the space for improving product performance. It has great advantages in outdoor road use. At the same time, compared with reflective beads made of traditional organic glue, to achieve the same performance, the present invention requires lower manufacturing costs, less energy consumption, and less environmental impact, etc., and has great market economic value.

Description

Technical Field

[0001] The present invention relates to the field of production of retroreflective bead products, and particularly to a weather-resistant and anti-detachment road bead and a preparation method thereof. Background Art

[0002] Road retroreflective beads are a new concept of reflective material that can greatly improve the road safety level and are substitutes for ordinary glass beads. The preparation of traditional road retroreflective beads is to mix and stir organic glue and titanium dioxide, or mix and stir organic glue (mainly epoxy glue) and pearlescent pigment to prepare a slurry, then mix the slurry with ordinary glass beads as the core and stir to make a layer of slurry evenly coat the surface of the glass beads to obtain coated glass beads, then distribute high-refractive-index glass microspheres on the surface of the coated glass beads, and finally cure the slurry to bond the high-refractive-index glass microspheres to the surface of the coated glass beads. Since road retroreflective beads are mainly used outdoors, the bonding strength between the cured slurry layer and the high-refractive-index glass microspheres is the key to the quality of road retroreflective beads. The detachment or contamination of the high-refractive-index glass microspheres will directly weaken their reflective performance. The weather resistance of the outdoor slurry layer is the key factor determining whether it can continuously maintain good bonding with the high-refractive-index glass microspheres. The continuous aging of the organic glue slurry layer outdoors will cause it to become brittle or even pulverized and lose its bonding property to the glass microspheres, resulting in the detachment of the high-refractive-index glass microspheres from the slurry layer and a cliff-like drop in the reflective performance of the road retroreflective beads. If special organic glue is used, the cost will be greatly increased.

[0003] For example, Patent Publication No. CN106565135A, "A Prefabricated Wear-Resistant Retroreflective Sand and Reflective Material for All-Weather Roads" discloses a plate including a plate on which a reflective coating is applied. The plate is made by pressing multiple layers of polyester cloth impregnated with epoxy resin acetone solution. The reflective coating is composed of wear-resistant retroreflective sand, resin coating, and retroreflective beads. The wear-resistant retroreflective sand is composed of white quartz sand or white corundum sand coated with an epoxy resin high-temperature curing system and reflective glass microspheres. The epoxy resin high-temperature curing system is composed of epoxy resin, curing agent, and pigment. The slurry layer of this invention still uses organic glue slurry as the main material of the binder and does not deviate from the traditional production method of retroreflective beads.

[0004] The present invention utilizes the fact that lead-free low-melting glass powder has excellent bonding strength and weather resistance after melting. After mixing lead-free low-melting glass powder with titanium dioxide or lead-free low-melting glass powder with pearlescent powder, an appropriate amount of water-based ink oil is added to make a slurry, which is used as the bonding slurry layer of road beads. This slurry layer melts the low-melting glass powder therein through a suitable sintering temperature to achieve integration with high-refractive-index glass microspheres, having extremely strong adhesiveness. Moreover, the low-melting glass powder has good outdoor weather resistance, relatively high temperature resistance, and also a certain enhancement in reflectivity. Therefore, a coating agent that is effectively suitable for improving the stain resistance of road beads can be more widely selected, increasing the space for improving product performance, and having great advantages in outdoor road use. Summary of the Invention

[0005] The present invention aims to provide a method for preparing weather-resistant and anti-detachment road beads. Using lead-free low-melting glass powder, pigments, ink oil, and glass beads as raw materials, weather-resistant and anti-detachment road beads are prepared through the processes of mixing, stirring, drying, sintering, and coating. The specific steps are as follows:

[0006] 1) Mixing: First, mix lead-free low-melting glass powder and pigments according to a certain mass ratio to prepare a glaze; the certain mass ratio of lead-free low-melting glass powder to pigments is (2.5 - 1):1.

[0007] 2) Stirring: Mix the glaze obtained in step 1) and ink oil according to a certain mass ratio to prepare a viscous slurry a, and mix and stir the viscous slurry a and glass beads according to a certain mass ratio so that the surface of the glass beads is evenly coated with the slurry a to obtain glass beads with the surface evenly coated with the slurry a; the diameter of the glass beads is 0.7 - 1.3 mm; the certain mass ratio of the glaze to the ink oil is (4.2 - 5.8):1; the certain mass ratio of the viscous slurry a to the glass beads is (7 - 16):100.

[0008] 3) Drying: Put the glass beads with the surface evenly coated with the slurry a obtained in step 2) into an oven and dry them at 130 - 170 °C for 8 - 12 min to obtain preformed road beads on the surface.

[0009] 4) Sintering: Put the preformed road beads on the surface obtained in step 3) into a furnace at a temperature of 560 - 590 °C and sinter for 8 - 12 min, and then take them out and cool to obtain formed road beads.

[0010] 5) Coating: Coat the road beads obtained in step 4) to obtain finished weather-resistant and anti-detachment road beads.

[0011] The lead-free low-melting-point glass powder is made of the following components in a mass ratio: Bi2O3 56%, SiO2 21.5%, B2O3 12.5%, ZnO 2.0%, Li2O 0.5%, K2O 0.5%, Na2O 3.0%, Al2O3 1.5%, ZrO2 0.3%, MgO 0.2%, TiO2 2.0%, and is made through melting, water quenching, ball milling, drying, and air flow crushing to a particle size d50 of 2.3-3.0 μm.

[0012] The pigment is titanium dioxide or pearlescent powder; the titanium dioxide is of rutile type; the pearlescent powder is weather-resistant and high-temperature-resistant pearlescent powder.

[0013] The varnish is prepared from water-based acrylic resin.

[0014] The finished weather-resistant anti-shedding road beads in step 5) include finished wet road beads and finished dry road beads; the refractive index of the glass beads in the finished wet road beads is 2.2-2.6; the refractive index of the glass beads in the finished dry road beads is 1.85-1.98.

[0015] The weather-resistant anti-shedding road beads are prepared according to the above method.

[0016] The present invention discloses a weather-resistant anti-falling road bead and a preparation method thereof, which has the following technical characteristics:

[0017] First, because the slurry layer is made of inorganic materials, it is naturally resistant to oxidation and temperature, and has a long service life outdoors;

[0018] Second, the slurry of the present invention is integrated with the glass beads after being melted at high temperature, which is less likely to peel off than the traditional slurry. At the same time, since the slurry of the present invention can withstand high temperatures, there is more room for the selection of coating agents suitable for improving the anti-fouling performance of road beads;

[0019] Third, compared with organic slurries that need to achieve the same performance, it has low manufacturing costs, low energy consumption, and little impact on the environment. DETAILED DESCRIPTION

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those in the technical field of this application.

[0021] The meanings generally understood by technicians are the same; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above description and any variations thereof are intended to cover non-exclusive inclusions.

[0022] In the following embodiments, unless otherwise specified in the following embodiments, the unstated parts are the same as those in the above embodiments. Embodiment

[0023] The present invention aims to provide a preparation method of weather-resistant and anti-detachment road beads. Using lead-free low-melting glass powder, pigments, ink oil, and glass beads as raw materials, weather-resistant and anti-detachment road beads are prepared through mixing, stirring, drying, sintering, and coating processes. The specific steps are as follows:

[0024] 1) Mixing: First, mix lead-free low-melting glass powder and pearlescent powder according to a certain mass ratio to prepare glaze; the certain mass ratio of lead-free low-melting glass powder to pearlescent powder is 3:2.

[0025] 2) Stirring: Mix the glaze obtained in step 1) with ink oil according to a certain mass ratio to prepare a viscous slurry a, and mix and stir the viscous slurry a with glass beads according to a certain mass ratio so that the surface of the glass beads is evenly coated with slurry a to obtain glass beads with the surface evenly coated with slurry a; the diameter of the glass beads is 0.9 mm; the certain mass ratio of the glaze to the ink oil is 82:18; the certain mass ratio of the viscous slurry a to the glass beads is 9:100; the refractive index of the glass beads is 1.93.

[0026] 3) Drying: Put the glass beads with the surface evenly coated with slurry a obtained in step 2) into an oven and dry at 150°C for 10 min to obtain preformed dry road beads.

[0027] 4) Sintering: Put the preformed dry road beads obtained in step 3) into a furnace with a temperature of 570°C and sinter for 10 min, then take them out and cool to obtain dry road beads.

[0028] 5) Coating: Coat the road beads obtained in step 4) to obtain finished weather-resistant and anti-detachment dry road beads.

[0029] The lead-free low-melting glass powder is made from the following components by mass ratio: Bi2O3 56%, SiO2 21.5%, B2O3 12.5%, ZnO 2.0%, Li2O 0.5%, K2O 0.5%, Na2O 3.0%, Al2O3 1.5%, ZrO2 0.3%, MgO 0.2%, TiO2 2.0%. It is made through melting, water quenching, ball milling, drying, and air flow pulverization to a particle size d50 of 2.5 μm.

[0030] The pigment is titanium dioxide or pearlescent powder; the titanium dioxide is of the rutile type; the pearlescent powder is weather-resistant and high-temperature-resistant pearlescent powder.

[0031] The ink oil is prepared from water-based acrylic resin.

[0032] The above-mentioned weather-resistant and anti-shedding dry road beads are prepared according to the above method. Example

[0033] The present invention aims to provide a preparation method of weather-resistant and anti-shedding road beads. Using lead-free low-melting glass powder, pigments, ink oil, and glass beads as raw materials, weather-resistant and anti-shedding road beads are prepared through mixing, stirring, drying, sintering, and coating processes. The specific steps are as follows:

[0034] 1) Mixing: First, mix the lead-free low-melting glass powder and pearlescent powder according to a certain mass ratio to prepare a glaze; the certain mass ratio of the lead-free low-melting glass powder to the pearlescent powder is 1:1.

[0035] 2) Stirring: Mix the glaze obtained in step 1) and the ink oil according to a certain mass ratio to prepare a viscous slurry a, and mix and stir the viscous slurry a and the glass beads according to a certain mass ratio so that the surface of the glass beads is evenly coated with the slurry a to obtain glass beads with the surface evenly coated with the slurry a; the diameter of the glass beads is 0.9 mm; the certain mass ratio of the glaze to the ink oil is 85:15; the certain mass ratio of the viscous slurry a to the glass beads is 7:100; the refractive index of the glass beads is 2.4.

[0036] 3) Drying: Put the glass beads with the surface evenly coated with the slurry a obtained in step 2) into an oven and dry them at 150 °C for 10 min to obtain preformed wet road beads.

[0037] 4) Sintering: Put the preformed wet road beads obtained in step 3) into a furnace with a temperature of 585 °C and sinter them for 10 min, then take them out and cool them to obtain wet road beads.

[0038] 5) Coating: Coat the road beads obtained in step 4) to obtain finished weather-resistant and anti-shedding wet road beads.

[0039] The lead-free low-melting glass powder is made from the following components by mass ratio: Bi2O3 56%, SiO2 21.5%, B2O3 12.5%, ZnO 2.0%, Li2O 0.5%, K2O 0.5%, Na2O 3.0%, Al2O3 1.5%, ZrO2 0.3%, MgO 0.2%, TiO2 2.0%. It is made through melting, water quenching, ball milling, drying, and air flow pulverization to a particle size d50 of 3.0 μm.

[0040] The pigment is titanium dioxide or pearlescent powder; the titanium dioxide is of the rutile type; the pearlescent powder is a weather-resistant and high-temperature-resistant pearlescent powder.

[0041] The ink oil is prepared from water-based acrylic resin.

[0042] The above-mentioned weather-resistant and anti-shedding road beads are prepared according to the above method. Example

[0043] The present invention aims to provide a method for preparing road beads. Using epoxy glue, pigments, ink oil, and glass beads as raw materials, weather-resistant and non-detachable road beads are prepared through processes of mixing, stirring, drying, and coating. The specific steps are as follows:

[0044] 1) Mixing: First, mix epoxy glue and pearlescent powder in a certain mass ratio to prepare glaze; the mass ratio of the lead-free low-melting-point glass powder to the pearlescent powder is 3:2.

[0045] 2) Stirring: Mix the glaze obtained in step 1) and ink oil in a certain mass ratio to prepare a viscous slurry a, and mix and stir the viscous slurry a and glass beads in a certain mass ratio so that the surface of the glass beads is evenly coated with the slurry a to obtain glass beads with the surface evenly coated with the slurry a; the diameter of the glass beads is 0.9 mm; the mass ratio of the glaze to the ink oil is 82:18; the mass ratio of the viscous slurry a to the glass beads is 9:100; the refractive index of the glass beads is 1.93.

[0046] 3) Drying: Put the glass beads with the surface evenly coated with the slurry a obtained in step 2) into an oven and dry at 150 °C for 10 minutes to obtain dry road beads.

[0047] 4) Coating: Coat the road beads obtained in step 4) to obtain finished dry road beads.

[0048] The pigment is titanium dioxide or pearlescent powder; the titanium dioxide is of the rutile type; the pearlescent powder is weather-resistant and high-temperature-resistant pearlescent powder.

[0049] The ink oil is prepared from water-based acrylic resin.

[0050] The dry road beads are prepared according to the above method.

[0051] The present invention aims to provide a method for preparing road beads. Using epoxy glue, pigments, ink oil, and glass beads as raw materials, road beads are prepared through processes of mixing, stirring, drying, and coating. The specific steps are as follows:

[0052] 1) Mixing: First, mix epoxy glue and pearlescent powder in a certain mass ratio to prepare glaze; the mass ratio of the lead-free low-melting-point glass powder to the pearlescent powder is 1:1.

[0053] 2) Stirring: Mix the glaze obtained in step 1) with ink oil in a certain mass ratio to prepare a viscous slurry a, and mix and stir the viscous slurry a with glass beads in a certain mass ratio so that the surface of the glass beads is evenly coated with the slurry a to obtain glass beads with the surface evenly coated with the slurry a; the diameter of the glass beads is 0.9 mm; the certain mass ratio of the glaze to the ink oil is 85:15; the certain mass ratio of the viscous slurry a to the glass beads is 7:100; the refractive index of the glass beads is 2.4;

[0054] 3) Drying: Put the glass beads with the surface evenly coated with the slurry a obtained in step 2) into an oven and dry them at 150 °C for 10 min to obtain wet road beads;

[0055] 4) Coating: Coat the road beads obtained in step 3) to obtain finished wet road beads;

[0056] The pigment is titanium dioxide or pearlescent powder; the titanium dioxide is of rutile type; the pearlescent powder is weather-resistant and high-temperature-resistant pearlescent powder.

[0057] The ink oil is prepared from water-based acrylic resin.

[0058] The road beads are prepared according to the above method.

[0059] The following table is a performance comparison table of the retroreflective brightness coefficient of all-weather road beads,

[0060]

[0061] Note: The test instrument is the American ROADVISTA stripemasterǁ road marking retroreflective test instrument;

[0062] The aging is simulated by a UV340 aging machine for outdoor aging.

[0063] The mixed road beads of Example 1 and 2 are prepared by mixing the road beads prepared by the method of Example 1 and the method of Example 2 in a mass ratio of 1:1, and the road beads are respectively distributed at a standard of 250 grams per square meter;

[0064] The mixed road beads of Comparative Example 1 and 2 are prepared by mixing the road beads prepared by the method of Comparative Example 1 and the method of Comparative Example 2 in a mass ratio of 1:1, and the road beads are respectively distributed at a standard of 250 grams per square meter;

[0065] The epoxy glue-bonded mixed road beads are prepared by mixing the wet and dry road beads prepared by the traditional method with epoxy glue as the main raw material of the slurry in a ratio of 1:1, and the road beads are respectively distributed at a standard of 250 grams per square meter.

[0066] Through the above experiments, it can be known that after the outdoor aging experiment, the brightness coefficient of the road beads produced according to the present invention is significantly higher than that of the road beads made with epoxy glue as the bonding layer.

[0067] The above is only the preferred embodiment of the present invention, and does not limit the scope of implementation of the present invention. Those who are familiar with this technology, using the principles and technical features of the present invention, all kinds of changes made should be covered within the protection scope defined by this claim.

Claims

1. A preparation method of weather-resistant anti-shedding road beads, characterized in that, Using lead-free low-melting glass powder, pigments, ink oil, and glass beads as raw materials, weather-resistant and anti-shedding road beads are prepared through the processes of mixing, stirring, drying, sintering, and coating. The specific steps are as follows: 1) Mixing: First, mix the lead-free low-melting glass powder and pigments according to a certain mass ratio to prepare a glaze; the mass ratio of the lead-free low-melting glass powder to the pigments is (2.5 - 1):

1. 2) Stirring: Mix the glaze obtained in step 1) with ink oil according to a certain mass ratio to prepare a viscous slurry a, and then mix and stir the viscous slurry a with glass beads according to a certain mass ratio. The diameter of the glass beads is 0.7 - 1.3 mm; ensure that the surface of the glass beads is evenly coated with slurry a to obtain glass beads with the surface evenly coated with slurry a. The mass ratio of the glaze to the ink oil is (4.2 - 5.8):1; the mass ratio of the viscous slurry a to the glass beads is (7 - 16):

100. 3) Drying: Put the glass beads with the surface evenly coated with slurry a obtained in step 2) into an oven and dry them at 130 - 170°C for 8 - 12 minutes to obtain preformed road beads on the surface. 4) Sintering: Put the preformed road beads on the surface obtained in step 3) into a furnace with a temperature of 560 - 590°C and sinter them for 8 - 12 minutes, then take them out and cool to obtain formed road beads. 5) Coating: Coat the road beads obtained in step 4) to obtain finished weather-resistant and anti-shedding road beads. The lead-free low-melting glass powder is made by melting, water quenching, ball milling, drying, and air-flow pulverization to a particle size d50 of 2.3 - 3.0 μm from the following components by mass ratio: Bi2O3 56%, SiO2 21.5%, B2O3 12.5%, ZnO 2.0%, Li2O 0.5%, K2O 0.5%, Na2O 3.0%, Al2O3 1.5%, ZrO2 0.3%, MgO 0.2%, TiO2 2.0%. The pigment is titanium dioxide or pearlescent powder; the titanium dioxide is of the rutile type; the pearlescent powder is weather-resistant and high-temperature-resistant pearlescent powder.

2. The preparation method of a weather-resistant and anti-shedding road bead according to claim 1, characterized in that, The ink oil is prepared from water-based acrylic resin.

3. The preparation method of a weather-resistant and anti-shedding road bead according to claim 1, characterized in that, The finished weather-resistant and anti-shedding road beads in step 5) include finished wet-state road beads and finished dry-state road beads; the refractive index of the glass beads in the finished wet-state road beads is 2.2 - 2.6; the refractive index of the glass beads in the finished dry-state road beads is 1.85 - 1.

98.

4. A weather-resistant anti-detachment road bead, characterized in that The weather-resistant and anti-shedding road beads are prepared according to the method described in any one of claims 1 - 3.

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