A method for preparing anti-freezing road traffic marking line coating

Abstract

A method for preparing an anti-freezing road traffic marking line coating relates to a method for preparing an outdoor road traffic marking line coating. The invention adopts the curing effect of the hydroxyl groups carried by nano inorganic ions, polyhydroxy dopamine, and hydroxy polyurethane modified acrylic dispersion and isocyanate curing agent, and performs multi-level free radical polymerization reaction on the surface of natural wind sand, the coating layer of artificial colored sand, and the coating layer surface, and the formed triple free radical reaction constitutes a dense cross-linked whole. The cured nanoparticles form an uneven high-roughness surface in the artificial colored sand coating layer, so that the surface of the artificial colored sand forms excellent water repellency, reducing the harm of water freezing to the artificial colored sand and the marking tape in cold climates. The coating of the invention is solvent-free, harmless, non-toxic and tasteless. It not only has excellent anti-freezing ability and wear resistance, but also has acid and alkali resistance, aging resistance, and freeze-thaw resistance.

Description

Technical Field

[0001] The invention relates to a method for preparing a road traffic marking line paint, in particular to a method for preparing an anti-freezing road traffic marking line paint. Background Art

[0002] my country's transportation industry has been in a period of rapid development, and highway construction has developed even more rapidly. By 2013, the total mileage of my country's highways had ranked first in the world, reaching 4.24 million kilometers. Highways are the foundation and lifeline of my country's economic development. The passenger volume they undertake accounts for 89.7% of the country's total passenger volume, and the freight volume accounts for 99% of the country's total freight volume. This shows that one of the prerequisites for economic development is to ensure the development of transportation. The jingle "If you want to get rich, build roads first" is a perfect interpretation of this idea. With the rapid development of transportation, the number of road markings that regulate and guide road traffic has increased year by year, and as a result, the amount of marking paint has increased. According to statistics, the amount of paint required for new markings and the amount of marking paint used for repairing markings is at least 180,000 tons each year.

[0003] Road marking originated from solvent-based paint, but this type of paint has a high pollution to the environment. At the same time, the road marking of this material has a short service life and needs frequent maintenance and re-marking. These shortcomings have seriously restricted the development of solvent-based paint. In recent years, the concept of environmental protection has been deeply rooted in people's hearts, and scholars have developed water-based road marking paint.

[0004] my country is a vast country with various geographical environments. Road marking tapes need to adapt to various climate environments. For roads in northern regions with severe cold climates, the water immersed in the road marking tapes often freezes due to the cold climate, further causing large volumes of ice to crack and wear the road marking tapes, thereby reducing the service life of the road marking tapes. In order to solve the anti-freezing problem of the coating, the most common method is to add organic solvents such as ethylene glycol. If it acts on the road marking tape, it becomes a solvent marking tape, which is contrary to the national environmental protection concept.

[0005] Colored sand is divided into natural colored sand and artificial colored sand. Natural colored sand is easy to process and has a natural and soft color, but the color is chaotic and the resources are limited. Therefore, artificial colored sand came into being. Artificial colored sand is generally prepared under high temperature environment, which consumes a lot of energy and has high cost. In addition, the aggregate of colored sand is mostly light-colored sand such as quartz sand, which is also limited in resources. Through the comprehensive utilization of natural wind sand, a solid waste that affects the ecological environment, it becomes the aggregate of artificial colored sand, and the artificial colored sand with anti-freezing performance is used as the main material of the road marking belt, and a water-based road marking paint with excellent anti-freezing, high wear resistance and long life is prepared. Summary of the invention

[0006] The purpose of the present invention is to provide a method for preparing an anti-freezing road traffic marking line coating. The present invention adopts the curing effect of the hydroxyl groups carried by nano inorganic ions, polyhydroxy dopamine, and hydroxy polyurethane modified acrylic dispersion and isocyanate curing agent, and carries out multi-level free radical polymerization reaction from the surface of natural sand, the artificial colored sand coating layer and the coating layer surface, and the formed triple free radical reaction constitutes a dense cross-linked whole; the prepared artificial colored sand is added as a filler to the tire base of the road marking tape to prepare a road marking tape with excellent performance.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A method for preparing an anti-freezing road traffic marking line coating, the method comprising the following preparation steps:

[0009] 50-100 parts of natural sand are placed in a planetary ball mill for ball milling, and natural sand with a mesh size of 50-100 is screened out with a sieve, and the screened natural sand is used as aggregate; the screened natural sand is placed in 2-5 parts of hydrochloric acid solution with a pH value adjusted to 8.5, 5-10 parts of dopamine hydrochloride are added, and after stirring at room temperature for 1 hour, it is washed with distilled water to obtain 50-100 parts of natural sand with polyhydroxy dopamine on the surface; 4-6 parts of SiO2 nanoparticles are uniformly dispersed in 8-12 parts of hydroxy polyurethane modified acrylic dispersion by ultrasonication for 30 minutes to obtain a hydroxy polyurethane modified acrylic dispersion with nanoparticles; the above-mentioned natural sand with polyhydroxy dopamine, the hydroxy polyurethane modified acrylic dispersion with nanoparticles, the pigment chrome yellow, and the isocyanate curing agent are placed in a dry beaker, heated and stirred at a water bath temperature of 80°C and a rotation speed of 500-600r / min for 70 minutes, and then dried to obtain anti-freezing and highly wear-resistant artificial colored sand;

[0010] The laboratory bench is cleaned of impurities, dust and dried, and a plastic film is spread flat on the laboratory bench; a number of rectangular mesh cloths are cut out and placed on the plastic film for use; the prepared artificial colored sand and water-based epoxy resin are mixed into a glass beaker and stirred evenly; glass beads are added, and the mixed slurry is evenly coated on the mesh cloth by scraping, and left to stand for 24 hours; the finished road marking paint is thus obtained.

[0011] The method for preparing an anti-freezing road traffic marking line coating comprises the following raw materials in parts by mass: 50-100 parts of natural sand, 2-5 parts of hydrochloric acid, 5-10 parts of dopamine hydrochloride, 1-10 parts of pigment chrome yellow, 4-6 parts of SiO2 nanoparticles, 8-12 parts of hydroxyl polyurethane modified acrylic dispersion, 24-36 parts of butyl acetate, 2-3 parts of isocyanate curing agent, 1-2 parts of mesh cloth, 3-5 parts of glass beads, and 10-20 parts of water-based epoxy resin.

[0012] In the method for preparing an anti-freezing road traffic marking line paint, the surface of the SiO2 nanoparticles has hydroxyl groups.

[0013] In the method for preparing an anti-freezing road traffic marking line paint, the water bath temperature is 80° C. and the rotation speed is 500-600 r / min.

[0014] In the method for preparing an anti-freezing road traffic marking line coating, the weight ratio of the isocyanate curing agent to the hydroxyl polyurethane modified acrylic dispersion is 1:4.

[0015] In the method for preparing an anti-freezing road traffic marking line paint, the ratio of acrylic resin to polyurethane resin in the mixed resin is 1:2.

[0016] The advantages and effects of the present invention are:

[0017] The present invention changes the traditional method of preparing the anti-freezing coating using organic solvents, and adopts the curing effect of the hydroxyl groups carried by nano inorganic ions, polyhydroxy dopamine, and hydroxy polyurethane modified acrylic dispersion and isocyanate curing agent, and performs multi-level free radical polymerization reaction from the surface of natural sand, the artificial colored sand coating layer and the coating surface, and the formed triple free radical reaction constitutes a dense cross-linked whole, and the colored sand coating layer will evaporate water by heating during the preparation process, and the water remaining in the coating layer will also be cured by the curing agent and remain in the coating layer. The cured nanoparticles form an uneven high-roughness surface in the artificial colored sand coating layer, so that the artificial colored sand surface forms excellent water repellency, thereby reducing the infiltration of water resources into the coating layer, thereby increasing the anti-freezing ability of the artificial colored sand, and reducing the harm of water freezing to the artificial colored sand and the marking tape in cold climates. Since the amino groups of polydopamine form a large number of hydrogen bonds with the hydroxyl groups on the surface of the nanoparticles, the mechanical properties of the surface coating formed after curing are improved, that is, the energy loss of the colored sand coating in the colored sand wear resistance test is reduced. In addition, the highly cross-linked coating layer greatly improves the wear resistance of the artificial colored sand and effectively increases its service life. Implementation

[0018] The present invention is described in detail below with reference to the embodiments. Example 1

[0019] After 100 parts of natural sand were ball-milled in a planetary ball mill for 5 minutes, natural sand with a mesh size of 50-100 was screened out with a sieve, and the screened natural sand was used as aggregate. The screened natural sand was placed in 5 parts of hydrochloric acid solution with a pH value adjusted to 8.5, 10 parts of dopamine hydrochloride were added and stirred at room temperature for 1 hour, and then washed with distilled water to obtain 100 parts of natural sand with polyhydroxy dopamine on the surface. 6 parts of SiO2 nanoparticles were uniformly dispersed in 12 parts of hydroxy polyurethane modified acrylic dispersion by ultrasonication for 30 minutes to obtain hydroxy polyurethane modified acrylic dispersion with nanoparticles. The above natural sand with polyhydroxy dopamine, hydroxy polyurethane modified acrylic dispersion with nanoparticles, pigment chrome yellow, and isocyanate curing agent were placed in a dry beaker, heated and stirred for 70 minutes at a water bath temperature of 80°C and a rotation speed of 500-600r / min, and then dried to obtain anti-freezing and highly wear-resistant artificial colored sand.

[0020] Next, the laboratory bench is cleaned of impurities, dust and dried, and the plastic film is laid flat on the laboratory bench. Several rectangular mesh cloths are cut out and placed on the plastic film for use. The prepared artificial colored sand and water-based epoxy resin are mixed and poured into a 500ml glass beaker and stirred evenly for 5 minutes. A certain amount of glass beads is added, and the mixed slurry is evenly coated on the mesh cloth by scraping and left to stand for 24 hours. A road marking tape with excellent performance is obtained. Example 2

[0021] 80 parts of natural sand were placed in a planetary ball mill for 5 minutes, and then sieved out natural sand with a mesh size of 50-100 with a sieve, and the sieved natural sand was used as aggregate. The sieved natural sand was placed in 5 parts of hydrochloric acid solution with a pH value adjusted to 8.5, 10 parts of dopamine hydrochloride were added, and after stirring at room temperature for 1 hour, it was washed with distilled water to obtain 100 parts of natural sand with polyhydroxy dopamine on the surface. 6 parts of SiO2 nanoparticles were uniformly dispersed in 12 parts of hydroxy polyurethane modified acrylic dispersion by ultrasonication for 30 minutes to obtain hydroxy polyurethane modified acrylic dispersion with nanoparticles. The above natural sand with polyhydroxy dopamine, hydroxy polyurethane modified acrylic dispersion with nanoparticles, pigment chrome yellow, and isocyanate curing agent were placed in a dry beaker, heated and stirred for 70 minutes at a water bath temperature of 80°C and a rotation speed of 500-600r / min, and then dried to obtain anti-freezing and highly wear-resistant artificial colored sand.

[0022] Next, the laboratory bench is cleaned of impurities, dust and dried, and the plastic film is laid flat on the laboratory bench. Several rectangular mesh cloths are cut out and placed on the plastic film for use. The prepared artificial colored sand and water-based epoxy resin are mixed and poured into a 500ml glass beaker and stirred evenly for 5 minutes. A certain amount of glass beads is added, and the mixed slurry is evenly coated on the mesh cloth by scraping and left to stand for 24 hours. A road marking tape with excellent performance is obtained. Example 3

[0023] 60 parts of natural sand were placed in a planetary ball mill for 5 minutes, and then 50-100 mesh natural sand was screened out with a sieve, and the screened natural sand was used as aggregate. The screened natural sand was placed in 5 parts of hydrochloric acid solution with a pH value adjusted to 8.5, 10 parts of dopamine hydrochloride were added and stirred at room temperature for 1 hour, and then washed with distilled water to obtain 100 parts of natural sand with polyhydroxy dopamine on the surface. 6 parts of SiO2 nanoparticles were uniformly dispersed in 12 parts of hydroxy polyurethane modified acrylic dispersion by ultrasonication for 30 minutes to obtain hydroxy polyurethane modified acrylic dispersion with nanoparticles. The above natural sand with polyhydroxy dopamine, hydroxy polyurethane modified acrylic dispersion with nanoparticles, pigment chrome yellow, and isocyanate curing agent were placed in a dry beaker, heated and stirred for 70 minutes at a water bath temperature of 80°C and a rotation speed of 500-600r / min, and then dried to obtain anti-freezing and highly wear-resistant artificial colored sand.

[0024] Next, the laboratory bench is cleaned of impurities, dust and dried, and the plastic film is laid flat on the laboratory bench. Several rectangular mesh cloths are cut out and placed on the plastic film for use. The prepared artificial colored sand and water-based epoxy resin are mixed and poured into a 500ml glass beaker and stirred evenly for 5 minutes. A certain amount of glass beads is added, and the mixed slurry is evenly coated on the mesh cloth by scraping and left to stand for 24 hours. A road marking tape with excellent performance is obtained.

[0025] Comparative Example 1

[0026] After 100 parts of natural sand are placed in a planetary ball mill for 5 minutes, the natural sand of 50-100 mesh is screened out with a sieve, and the screened natural sand is taken as aggregate. The screened natural sand is placed in 5 parts of hydrochloric acid solution with a pH value adjusted to 8.5, 10 parts of dopamine hydrochloride are added and stirred at room temperature for 1 hour, and then washed with distilled water to obtain 100 parts of natural sand with polyhydroxy dopamine on the surface. The above-mentioned natural sand with polyhydroxy dopamine, hydroxy polyurethane modified acrylic dispersion, pigment chrome yellow, and isocyanate curing agent are placed in a dry beaker, heated and stirred at a water bath temperature of 80°C and a rotation speed of 500-600r / min for 70 minutes, and then dried to obtain anti-freezing and highly wear-resistant artificial colored sand.

[0027] Next, the laboratory bench is cleaned of impurities, dust and dried, and the plastic film is laid flat on the laboratory bench. Several rectangular mesh cloths are cut out and placed on the plastic film for use. The prepared artificial colored sand and water-based epoxy resin are mixed and poured into a 500ml glass beaker and stirred evenly for 5 minutes. A certain amount of glass beads is added, and the mixed slurry is evenly coated on the mesh cloth by scraping and left to stand for 24 hours. A road marking tape with excellent performance is obtained.

[0028] Comparative Example 2

[0029] 100 parts of natural sand were placed in a planetary ball mill for 5 minutes, and then 50-100 mesh natural sand was screened out with a sieve, and the screened natural sand was used as aggregate. 6 parts of SiO2 nanoparticles were uniformly dispersed in 12 parts of hydroxy polyurethane modified acrylic dispersion by ultrasonic treatment for 30 minutes to obtain hydroxy polyurethane modified acrylic dispersion with nanoparticles. The above natural sand, hydroxy polyurethane modified acrylic dispersion with nanoparticles, pigment chrome yellow, and isocyanate curing agent were placed in a dry beaker, heated and stirred for 70 minutes at a water bath temperature of 80°C and a rotation speed of 500-600r / min, and then dried to obtain anti-freezing and highly wear-resistant artificial colored sand.

[0030] Next, the laboratory bench is cleaned of impurities, dust and dried, and the plastic film is laid flat on the laboratory bench. Several rectangular mesh cloths are cut out and placed on the plastic film for use. The prepared artificial colored sand and water-based epoxy resin are mixed and poured into a 500ml glass beaker and stirred evenly for 5 minutes. A certain amount of glass beads is added, and the mixed slurry is evenly coated on the mesh cloth by scraping and left to stand for 24 hours. A road marking tape with excellent performance is obtained.

[0031] Comparative Example 3

[0032] After 100 parts of natural sand were ball-milled in a planetary ball mill for 5 minutes, natural sand with a mesh size of 50-100 was screened out with a sieve, and the screened natural sand was used as aggregate. The screened natural sand was placed in 5 parts of hydrochloric acid solution with a pH value adjusted to 8.5, 10 parts of dopamine hydrochloride were added and stirred at room temperature for 1 hour, and then washed with distilled water to obtain 100 parts of natural sand with polyhydroxy dopamine on the surface. 6 parts of SiO2 nanoparticles were uniformly dispersed in 12 parts of acrylic resin by ultrasonic treatment for 30 minutes to obtain a hydroxy polyurethane modified acrylic dispersion with nanoparticles. The above natural sand with polyhydroxy dopamine, acrylic resin with nanoparticles, pigment chrome yellow, and isocyanate curing agent were placed in a dry beaker, heated and stirred for 70 minutes at a water bath temperature of 80°C and a rotation speed of 500-600r / min, and then dried to obtain anti-freezing and highly wear-resistant artificial colored sand.

[0033] Next, the laboratory bench is cleaned of impurities, dust and dried, and the plastic film is laid flat on the laboratory bench. Several rectangular mesh cloths are cut out and placed on the plastic film for use. The prepared artificial colored sand and water-based epoxy resin are mixed and poured into a 500ml glass beaker and stirred evenly for 5 minutes. A certain amount of glass beads is added, and the mixed slurry is evenly coated on the mesh cloth by scraping and left to stand for 24 hours. A road marking tape with excellent performance is obtained.

[0034] The water repellency test was performed on the road marking tapes prepared in six groups, namely, the water loss rate after the same mass of water flows through the prepared road marking tapes.

[0035] Table 1 Water repellency loss rate of six groups

[0036]

[0037] Excellent: ≤1%, Good: ≤3%, Poor: >3%

[0038] The water repellency of the six groups is the average loss rate obtained from multiple experiments. From Table 1, it can be seen that the road marking tapes prepared by triple free radical reaction have excellent water repellency. The comparison group has no excellent water repellency because the water repellency is far from being effective if it depends on one or two of the surface energy, roughness, and cross-linking degree. It is necessary for all three data to meet the appropriate standards to have excellent water repellency.

[0039] Next, the wear resistance of the road marking tapes prepared in six groups, namely, Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2 and Comparative Example 3, was tested.

[0040] Wear test: A 500 g weight was placed horizontally on the prepared road marking tape, and the weight was dragged and repeatedly moved 24 times to calculate the wear rate of the road marking tape.

[0041] Table 2 Wear rate of six groups

[0042]

[0043] After comparing the wear rates of six groups, the wear rate of Comparative Example 3 is the largest. This is because the hydroxyl polyurethane modified acrylic dispersion used in the coating layer in the process of preparing artificial colored sand is changed to acrylic resin, which reduces the degree of crosslinking in the curing action. Too little crosslinking will reduce the strength of the colored sand coating layer, thereby reducing the wear resistance of the colored sand, and further increasing the wear rate of the prepared road marking tape.

[0044] The reason why the wear rates of Comparative Examples 2 and 1 are greater than those of the embodiment is that there are a large number of hydrogen bonds between polydopamine and the inorganic nanoparticles, which reduces the energy of the colored sand coating layer and reduces the wear resistance of the colored sand.

Claims

1. A method for preparing an anti-freezing road traffic marking paint, characterized in that: The method comprises the following preparation steps: 50-100 parts of natural sand are placed in a planetary ball mill for ball milling, and natural sand with a mesh size of 50-100 is screened out with a sieve, and the screened natural sand is used as aggregate; the screened natural sand is placed in 2-5 parts of hydrochloric acid solution with a pH value adjusted to 8.5, 5-10 parts of dopamine hydrochloride are added, and after stirring at room temperature for 1 hour, it is washed with distilled water to obtain 50-100 parts of natural sand with polyhydroxy dopamine on the surface; 4-6 parts of SiO2 nanoparticles are uniformly dispersed in 8-12 parts of hydroxy polyurethane modified acrylic dispersion by ultrasonication for 30 minutes to obtain a hydroxy polyurethane modified acrylic dispersion with nanoparticles; the above-mentioned natural sand with polyhydroxy dopamine, the hydroxy polyurethane modified acrylic dispersion with nanoparticles, the pigment chrome yellow, and the isocyanate curing agent are placed in a dry beaker, heated and stirred at a water bath temperature of 80°C and a rotation speed of 500-600r / min for 70 minutes, and then dried to obtain anti-freezing and highly wear-resistant artificial colored sand; The laboratory table is cleaned of impurities, dust and dried, and a plastic film is laid flat on the laboratory table; a number of rectangular mesh cloths are cut out and placed on the plastic film for use; the prepared artificial colored sand and water-based epoxy resin are mixed and poured into a glass beaker and stirred evenly; glass micro beads are added, and the mixed slurry is evenly coated on the mesh cloth by scraping, and left to stand for 24 hours; the finished road marking paint is thus obtained; The SiO2 nanoparticles have hydroxyl groups on their surfaces; The weight ratio of the isocyanate curing agent to the hydroxy polyurethane modified acrylic dispersion is 1:4.

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