Durable high-brightness water-based tunnel porcelainized coating finish paint and preparation method thereof

Abstract

The invention discloses a durable high-brightness water-based tunnel porcelainized coating finish paint and a preparation method thereof. The preparation method comprises the following steps: uniformly grinding the titanium dioxide, the glass beads, the ground calcium carbonate, the silica powder, the deionized water, the styrene-acrylic emulsion and the polyurethane emulsion in a horizontal grinding machine, then introducing into a dispersion machine, adding the dispersing agent, the defoaming agent, the coalescing agent, the adhesion promoter, the anti-settling agent and the methanol, and uniformly dispersing to obtain the coating. According to the invention, the glass beads are introduced into the porcelainized paint finish paint, so that the glossiness of the finish paint is effectively improved; by synthesizing a water-based latent epoxy modified polyurethane adhesive emulsion, the bonding performance of the adhesive to all components and the bonding capacity of the adhesive to a lower layer are enhanced, and the durability of a porcelainized coating system is improved; by internally doping the modified styrene-acrylic emulsion finishing coat material, the surface flatness and hydrophobicity of the porcelainized coating finishing coat are improved, the adhesive force of dust and the like to the surface of the porcelainized coating is reduced, and convenient conditions are created for cleaning the surface of the porcelainized coating.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a durable high-brightness water-based tunnel porcelain coating topcoat and a preparation method thereof. Background Art

[0002] Highway tunnels have the characteristics of large changes in light and shade, high lighting requirements and high potential driving safety hazards. In order to ensure the brightness of highway tunnels, the management and maintenance units consume huge amounts of electricity every year. Electricity is an important factor causing high carbon emissions and has a very adverse impact on the ecological environment. With the development of science and technology, scientific methods are used to improve the brightness of tunnels, thereby reducing energy consumption and its impact on the ecological environment. In the 1920s, the application of ceramic tiles in tunnels reduced energy consumption and the impact on the ecological environment, but its main disadvantages were poor durability, poor integrity, poor visual effects, and easy to fall off. Subsequently, the porcelain coating system was applied to the inner wall of the tunnel, which solved the problem of poor integrity and easy falling of tiles in the tunnel, reduced the energy consumption of the tunnel, and improved the brightness of the tunnel, but its main disadvantages were low gloss, poor durability, and high maintenance difficulty. Summary of the invention

[0003] Aiming at the problem of low gloss of tunnel porcelain coating, the present invention provides a durable high-brightness water-based tunnel porcelain coating topcoat and a preparation method thereof. The prepared porcelain coating topcoat has the advantages of good durability, high brightness, easy cleaning and good environmental protection.

[0004] The durable high-brightness water-based tunnel porcelain coating topcoat is composed, by mass, of 15-20 parts of deionized water, 5-10 parts of styrene acrylic emulsion, 10-20 parts of polyurethane emulsion, 15-25 parts of titanium dioxide, 10-15 parts of glass microspheres, 7-10 parts of heavy calcium carbonate, 5-8 parts of silicon micropowder, 0.2-1 parts of dispersant, 0.2-0.7 parts of defoaming agent, 1-2 parts of film-forming aid, 0.2-0.8 parts of adhesion promoter, 0.3-0.5 parts of anti-precipitation agent and 5-10 parts of methanol.

[0005] The preparation method of the durable high-brightness water-based tunnel porcelain coating topcoat is as follows: first, titanium dioxide, glass beads, heavy calcium carbonate, silicon powder, deionized water, styrene acrylic emulsion, and polyurethane emulsion are evenly ground in a horizontal grinder, then introduced into a disperser, dispersant, defoamer, film-forming aid, adhesion promoter, anti-precipitation agent and methanol are added, and after evenly dispersing, they are transferred into finished product packaging barrels and sealed and stored in a cool place.

[0006] The preparation method of the styrene-acrylic emulsion is as follows: 5-10 parts by weight of anionic surfactant, 15-20 parts by weight of water, 20-25 parts by weight of styrene, 12-15 parts by weight of octyl ester, 12-20 parts by weight of acrylic acid and 8-12 parts by weight of silane coupling agent are mixed and then thermally initiated to polymerize.

[0007] The preparation method of the polyurethane emulsion is as follows: weigh 60 parts by mass of epoxy resin E30 and 10 parts by mass of silane coupling agent KH550, and heat in a water bath at 80°C to obtain intermediate A; after cooling, add 30 parts by mass of isocyanate, and heat in a water bath at 80°C for 5 hours to obtain intermediate B; mix 60 parts by mass of polyether polyol PTHF1000 and 40 parts by mass of isocyanate TDI-80, and heat in a water bath at 80°C for 5 hours to obtain intermediate C; 20-40 parts by mass of intermediate B, 20-30 parts by mass of intermediate C, 10-20 parts by mass of latent polyurethane curing agent, 5-20 parts by mass of emulsifier, and 30-50 parts by mass of deionized water, and stir for 1 hour to obtain polyurethane emulsion.

[0008] The present invention introduces glass microbeads into the porcelain coating topcoat, which effectively improves the glossiness of the topcoat; in view of the poor durability of tunnel porcelain coating, the adhesive bonding performance to each component and its bonding ability to the lower layer are enhanced by synthesizing a water-based latent epoxy-modified polyurethane adhesive emulsion, thereby improving the durability of the porcelain coating system. By internally adding a modified styrene-acrylic emulsion topcoat material, the surface flatness and hydrophobicity of the porcelain coating topcoat are improved, thereby reducing the adhesion of dust to the porcelain coating surface, reducing the adhesion of dust to the porcelain coating surface, and creating convenient conditions for cleaning the porcelain coating surface. DETAILED DESCRIPTION

[0009] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments. Example

[0010] (1) The styrene-acrylic emulsion was synthesized by thermal polymerization process: 50 kg of anionic surfactant sodium dodecyl sulfate, 200 kg of water, 200 kg of styrene, 200 kg of acrylic acid, 120 kg of octyl ester and 80 kg of silane coupling agent KH550 were reacted in a reactor at 80 °C.

[0011] (2) Polyurethane emulsion: 600 kg of epoxy resin E30 and 100 kg of silane coupling agent KH550 were accurately weighed according to the mass ratio and heated in a water bath at 80 °C to prepare intermediate A; after cooling, 300 kg of isocyanate was added and heated in a water bath at 80 °C for 5 h to obtain intermediate B; 600 kg of polyether polyol PTHF1000 and 400 kg of isocyanate TDI-80 were mixed and heated in a water bath at 80 °C for 5 h to obtain intermediate C; 200 kg of intermediate B, 210 kg of intermediate C, 170 kg of latent polyurethane curing agent W01, 350 kg of deionized water and 50 kg of emulsifier XY-WL90 were stirred at high speed for 1 h to obtain intermediate C.

[0012] (3) Synthesis of durable high-brightness water-based tunnel porcelain coating topcoat: Grind 200kg 400-mesh titanium dioxide, 150kg glass beads, 70kg 400-mesh heavy calcium carbonate, 80kg 1250-mesh silica powder, 150kg deionized water, 100kg styrene-acrylic emulsion, and 150kg polyurethane emulsion in a horizontal grinder for 40 min, then introduce into a disperser, add 2kg silicate dispersant LBCB-1, 3kg silicone defoamer, 10kg film-forming aid propylene glycol butyl ether, 2kg adhesion promoter, 3kg anti-precipitation agent hydrogenated castor oil and 70kg methanol, disperse at a high speed of 1000rad / min for 30 min, transfer into finished product packaging barrels, and store in a sealed container in a cool place.

Claims

1. A durable high-brightness water-based tunnel porcelain coating topcoat, characterized in that: The porcelain coating topcoat is composed, by weight, of 15-20 parts of deionized water, 5-10 parts of styrene acrylic emulsion, 10-20 parts of polyurethane emulsion, 15-25 parts of titanium dioxide, 10-15 parts of glass microspheres, 7-10 parts of heavy calcium carbonate, 5-8 parts of silicon micropowder, 0.2-1 parts of dispersant, 0.2-0.7 parts of defoaming agent, 1-2 parts of film-forming aid, 0.2-0.8 parts of adhesion promoter, 0.3-0.5 parts of anti-precipitation agent and 5-10 parts of methanol.

2. The method for preparing the durable high-brightness water-based tunnel porcelain coating topcoat according to claim 1, characterized in that: The specific operation of the preparation method is: firstly, titanium dioxide, glass microbeads, heavy calcium carbonate, silicon micropowder, deionized water, styrene acrylic emulsion, and polyurethane emulsion are evenly ground in a horizontal grinder, then introduced into a disperser, dispersant, defoamer, film-forming aid, adhesion promoter, anti-precipitation agent and methanol are added, and after evenly dispersing, they are transferred into finished product packaging barrels and sealed and stored in a cool place.

3. The preparation method according to claim 2, characterized in that: The preparation method of the styrene-acrylic emulsion is as follows: 5-10 parts by weight of anionic surfactant, 15-20 parts by weight of water, 20-25 parts by weight of styrene, 12-15 parts by weight of octyl ester, 12-20 parts by weight of acrylic acid and 8-12 parts by weight of silane coupling agent are mixed and then thermally initiated to polymerize.

4. The preparation method according to claim 2, characterized in that: The preparation method of the styrene-acrylic emulsion is as follows: the preparation method of the polyurethane emulsion is as follows: 60 parts by mass of epoxy resin E30 and 10 parts by mass of silane coupling agent KH550 are weighed and heated in a water bath at 80°C to obtain intermediate A; after cooling, 30 parts by mass of isocyanate are added, and heated in a water bath at 80°C for 5 hours to obtain intermediate B; 60 parts by mass of polyether polyol PTHF1000 and 40 parts by mass of isocyanate TDI-80 are mixed, and heated in a water bath at 80°C for 5 hours to obtain intermediate C; 20-40 parts by mass of intermediate B, 20-30 parts by mass of intermediate C, 10-20 parts by mass of latent polyurethane curing agent, 5-20 parts by mass of emulsifier, and 30-50 parts by mass of deionized water are mixed and stirred for 1 hour to obtain polyurethane emulsion.