A road surface anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, its preparation method and usage method

Abstract

The present invention discloses a road anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, its preparation method and usage method, belonging to the technical field of road coatings. The road anti-slip repair type coating provided by the present invention comprises the following components in parts by mass: 25-30 parts of quick-setting cement; 2-4 parts of composite nano-photocatalyst; 5-8 parts of surface-grafted amino composite resin emulsion; 10-15 parts of water; 40-45 parts of quartz sand; 1-2 parts of silica fume; 3-5 parts of surfactant. In the coating provided by the present invention, the surface-grafted amino composite resin emulsion and the composite nano-photocatalyst synergistically improve the photocatalytic degradation effect to achieve the purpose of tail gas purification. At the same time, the coating itself can repair road diseases, enhance the anti-slip performance of the road surface, has strong durability and low cost; in addition, the coating has low energy consumption in the preparation process, simple construction, can quickly open to traffic, and has good environmental protection performance.

Description

Technical Field

[0001] The present invention relates to the technical field of road surface coatings, and in particular to a road surface anti-slip repair type coating capable of photocatalytically degrading automobile exhaust, and a preparation method and a use method thereof. Background Art

[0002] The information disclosed in the background art of the present invention is only intended to increase the understanding of the overall background of the present invention, and does not necessarily be regarded as an admission or imply in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] The sharp increase in the number of automobiles has led to the increasingly serious problem of automobile exhaust emissions, which has become one of the important factors affecting air quality and the ecological environment. Therefore, effectively purifying nitrogen oxides emitted by motor vehicles has important social and ecological significance.

[0004] At present, most methods for treating automobile exhaust are concentrated on the automobile itself, including in-engine purification and out-of-engine purification of exhaust gas. These measures have certain effects, but there are problems such as complex technology, high cost, large occupied space, high maintenance requirements, and potential secondary pollution hazards. After the automobile exhaust is discharged, it will directly contact the road surface. Under long-term action, the erosion and damage to the road surface materials cannot be underestimated, which not only reduces the service life of the road surface, but also may affect driving safety. In addition, for road surface diseases such as road surface polishing, aging and peeling caused by factors such as exhaust gas action, wheel action, and environment, traditional solutions to road surface diseases have problems such as complex repair procedures or poor durability, resulting in the repair affecting the traffic time or frequent repair. Therefore, exploring a way to solve exhaust gas pollution from the perspective of road maintenance can not only make up for the deficiencies of existing automobile exhaust treatment means, but also reduce the adverse effects of exhaust gas on the road surface, which has far-reaching significance for environmental protection and road maintenance.

[0005] The patent with the authorization announcement number CN116285580B discloses a road surface coating for photocatalytic degradation of vehicle exhaust and its preparation method. First, an aqueous epoxy resin emulsion is sprayed on the road surface to form a base layer, then a mixed resin emulsion of the aqueous epoxy resin emulsion and a filler is sprayed thereon to form a surface layer, and finally a nano-titanium dioxide solution is sprayed on the surface of the surface layer. This patent can oxidize harmful substances in vehicle exhaust, such as carbon monoxide and nitrogen oxides, into carbon dioxide and nitrates harmless to humans respectively, so as to achieve the purpose of reducing exhaust pollution. However, this patent uses a large amount of epoxy resin emulsion, resulting in high costs. Moreover, the coating formed by it has a rapid loss of flexural strength under cyclic loading and is difficult to meet the durability requirements of high-traffic roads. In addition, the solution of this patent requires multiple construction operations, which is cumbersome, time-consuming, and seriously affects the road traffic efficiency. Furthermore, the coating of this patent has a single function, the interfacial bonding force between nano-titanium dioxide and the bottom layer is weak, and interlayer peeling is likely to occur during long-term service, resulting in a reduction in photocatalytic efficiency. At the same time, the dispersion solvent of nano-titanium dioxide is a non-aqueous solvent, with a relatively high VOC problem and poor environmental protection performance.

[0006] Therefore, it is particularly important and urgent to develop a road surface anti-slip repair coating that can not only effectively degrade harmful substances in vehicle exhaust, but also repair surface diseases of the road surface, and has low costs, simple construction, and environmental friendliness. Summary of the Invention

[0007] In view of this, the present invention provides a road surface anti-slip repair coating for photocatalytic degradation of vehicle exhaust, its preparation method and usage method. The road surface anti-slip repair coating provided by the present invention has the performance of efficiently degrading harmful pollutants in vehicle exhaust, and also has high flexural strength, high compressive strength, and good anti-slip performance, with low costs and good durability.

[0008] In the first aspect, the present invention provides a road surface anti-slip repair coating for photocatalytic degradation of vehicle exhaust, which comprises the following components in parts by mass:

[0009] Quick-setting cement: 25 - 30 parts;

[0010] Composite nano-photocatalyst: 2 - 4 parts;

[0011] Surface-grafted amino composite resin emulsion: 5 - 8 parts; the surface-grafted amino composite resin emulsion is obtained by compounding an aqueous acrylate emulsion and an aqueous polyurethane emulsion with amino groups on the surface;

[0012] Water: 10 - 15 parts;

[0013] Quartz sand: 40 - 45 parts;

[0014] Silica fume: 1 - 2 parts;

[0015] Surfactant: 3 - 5 parts.

[0016] Preferably, the composite nano-photocatalyst comprises nano-titanium dioxide and nano-ATO.

[0017] Furthermore, the mass ratio of the nano-titanium dioxide to the nano-ATO is 1:(0.5~1.5).

[0018] Preferably, the mass ratio of the aqueous acrylate emulsion to the aqueous polyurethane emulsion with amino groups on the surface is 1:(0.5~1.5); the solid content of the aqueous acrylate emulsion is 30~35%, and the solid content of the aqueous polyurethane emulsion with amino groups on the surface is 30~35%.

[0019] Preferably, the preparation process of the aqueous polyurethane emulsion with amino groups on the surface is as follows: acrylamide is mixed with the aqueous polyurethane prepolymer, and then an aqueous solution of a thermal initiator is added for graft polymerization. After purification, the aqueous polyurethane emulsion with amino groups on the surface is obtained.

[0020] Furthermore, the mass ratio of the acrylamide to the aqueous polyurethane prepolymer is 1:(3~5); the thermal initiator is selected from potassium persulfate, sodium persulfate or ammonium persulfate.

[0021] Preferably, the quick-setting cement is a quick-hardening sulphoaluminate cement with a strength grade of 42.5.

[0022] Preferably, the surfactant is selected from one or more of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate or Tween-80.

[0023] Preferably, the quartz sand includes quartz sand with particle sizes of 10~20 mesh and 30~40 mesh, and the mass ratio of the quartz sand with particle sizes of 10~20 mesh to the quartz sand with particle sizes of 30~40 mesh is 1:(0.5~1.5).

[0024] In a second aspect, the present invention provides a preparation method of the above-mentioned road surface anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, comprising the following steps:

[0025] Mix the quick-setting cement, the composite nano-photocatalyst, the quartz sand, the silica fume and the surfactant to obtain a dry mixture;

[0026] Add the surface-grafted amino composite resin emulsion into water and mix evenly, then pour it into the dry mixture and continue to stir evenly to obtain the product.

[0027] In a third aspect, the present invention provides a usage method of the above-mentioned road surface anti-slip repair type coating for photocatalytic degradation of vehicle exhaust or the road surface anti-slip repair type coating for photocatalytic degradation of vehicle exhaust prepared by the above-mentioned preparation method, comprising the following steps:

[0028] Clean the construction road surface, cover the anti-slip repair type coating for photocatalytic degradation of vehicle exhaust on the road surface and smear it flatly, and it can be opened to traffic after curing for 15 - 25 minutes.

[0029] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0030] (1) The present invention uses a composite nano-photocatalyst and a surface-grafted amino composite resin emulsion to catalytically decompose harmful substances in vehicle exhaust under light conditions, converting them into harmless water, carbon dioxide and nitrogen, so as to achieve the purpose of exhaust purification; the surface-grafted amino composite resin emulsion provides a stable attachment environment for the composite nano-photocatalyst and increases active sites, and the two cooperate to improve the photocatalytic degradation effect; at the same time, the coating provided by the present invention can repair road surface diseases itself, and the surface is designed with a rough structure, which greatly improves the friction coefficient with the tire and enhances the anti-slip performance of the road surface. Even in rainy or slippery conditions, it can ensure the stability and safety of vehicle driving; moreover, the raw material cost of the present invention is low, and the cured coating has excellent compressive strength and flexural strength and strong durability.

[0031] (2) During the preparation of the anti-slip repair type coating for photocatalytic degradation of vehicle exhaust provided by the present invention, it can be mixed at room temperature, without heating and special treatment, with low energy consumption, no waste gas emission, less manpower and material resources required, and its construction is fast, it can quickly open to traffic, and the VOC content is low, with high environmental protection, low requirements for the construction environment and time, and it can even be constructed after rain. Detailed Embodiments

[0032] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0033] The present invention provides an anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, which comprises the following components in parts by mass:

[0034] Quick-setting cement: 25 - 30 parts;

[0035] Composite nano-photocatalyst: 2 - 4 parts;

[0036] Surface-grafted amino composite resin emulsion: 5 - 8 parts; the surface-grafted amino composite resin emulsion is obtained by compounding an aqueous acrylate emulsion and an aqueous polyurethane emulsion with amino groups on the surface;

[0037] Water: 10 - 15 parts;

[0038] Quartz sand: 40 - 45 parts;

[0039] Silica fume: 1 - 2 parts;

[0040] 3 to 5 parts of surfactant.

[0041] In the above-mentioned road surface anti-skid repair type coating of the present invention, the quick-setting cement can be quickly cured, enabling the coating to reach the expected strength standard within 15 to 25 minutes, greatly shortening the opening time of the road surface after construction. At the same time, as the main cementitious material, it can bond other components together to form a stable overall structure, providing the basic strength of the coating and ensuring the bearing capacity of the road surface after repair to meet the driving requirements of vehicles. The composite nano-photocatalyst can catalytically decompose harmful substances in vehicle exhaust under light conditions and convert them into harmless water, carbon dioxide, and nitrogen. The surface-grafted amino composite resin emulsion is obtained by compounding an aqueous acrylate emulsion and an aqueous polyurethane emulsion with amino groups on the surface. Among them, the amino groups of the aqueous polyurethane emulsion with amino groups on the surface have high reactivity and can chemically react with nitrogen oxides in the exhaust gas to convert these harmful pollutants into harmless nitrogen and water, directly participating in exhaust gas purification. The introduction of the acrylate emulsion can, on the one hand, reduce the cost of the composite emulsion, and on the other hand, it has good aging resistance and can improve the flexural strength of the coating after curing. In addition, the surface-grafted amino composite resin emulsion provides a stable attachment environment for the composite nano-photocatalyst, increasing the active sites and enabling it to stably play the role of photocatalytic degradation.

[0042] In the above-mentioned road surface anti-skid repair type coating of the present invention, the rough surface structure of quartz sand can effectively increase the friction coefficient between the coating and the tire, enhance the anti-skid performance of the road surface, and ensure the stability and safety of vehicles during driving, especially under rainy or slippery conditions. At the same time, it is filled inside the coating, which can improve the overall density, enhance the wear resistance of the coating, reduce the wear caused by wheel friction, and extend the service life of the road surface. The fine particles of silica fume can fill the pores in the cement stone, improve the microstructure of the coating, increase the density, and thus enhance the compressive strength and impermeability of the coating. Moreover, its active components can undergo a secondary reaction with the hydration products of cement to generate more gel substances, increasing the adhesion and durability of the coating and improving the road surface repair effect. The surfactant can significantly reduce the surface tension of the coating system, make particles such as the composite nano-catalyst and quartz sand evenly dispersed in the coating, avoid agglomeration, ensure that each component fully plays its role, and improve the uniformity and stability of the coating. Moreover, it can improve the wettability of the coating to the road surface, enhance the bonding effect between the coating and the road surface, make the repaired road surface bond more tightly and not easily fall off.

[0043] In the present invention, the composite nano-photocatalyst comprises nano-titanium dioxide and nano-ATO (antimony tin oxide), and the synergistic effect of the two significantly improves the photocatalytic effect. The band gap of nano-titanium dioxide is 3.2 eV, and it has high photocatalytic activity under ultraviolet light, is non-toxic, harmless, and has stable performance; nano-ATO has good electrical conductivity and light stability. When irradiated by short-wavelength light, the two quickly form electron-hole pairs together, generating a large number of strongly oxidizing active free radicals. The automobile exhaust first contacts the road surface material. When the road surface is irradiated by sunlight, nano-titanium dioxide and nano-ATO synergistically generate more hydroxyl radicals, which can more efficiently decompose the organic pollutants in the automobile exhaust into harmless small-molecule inorganic substances, continuously reduce the automobile exhaust pollution on the road surface, and can play a role repeatedly, continuously reducing the pollution level. Further, the mass ratio of nano-titanium dioxide to nano-ATO is 1:(0.5 - 1.5), and the present invention preferably adopts 1:1.

[0044] The present invention does not impose special restrictions on the sizes of nano-titanium dioxide and nano-ATO, and the sizes of nano-titanium dioxide and nano-ATO commonly used in the art can be adopted. Preferably in the present invention, the particle size of nano-titanium dioxide is 10 - 30 nm, and the particle size of nano-ATO is 10 - 30 nm.

[0045] In the present invention, the mass ratio of the waterborne acrylate emulsion to the waterborne polyurethane emulsion with amino groups on the surface is 1:(0.5 - 1.5), more preferably 1:(0.8 - 1.2); the solid content of the waterborne acrylate emulsion is 30 - 35%, and the solid content of the waterborne polyurethane emulsion with amino groups on the surface is 30 - 35%.

[0046] In the present invention, the preparation process of the waterborne polyurethane emulsion with amino groups on the surface is as follows: acrylamide is mixed with the waterborne polyurethane prepolymer, and then an aqueous solution of a thermal initiator is added for graft polymerization, and after purification, the waterborne polyurethane emulsion with amino groups on the surface is obtained. Further, the mass ratio of acrylamide to the waterborne polyurethane prepolymer is 1:(3 - 5); the thermal initiator is selected from potassium persulfate, sodium persulfate or ammonium persulfate. The present invention does not impose special restrictions on the reaction conditions of graft polymerization. The present invention preferably reacts at 55 - 70 °C for 3 - 8 h. The present invention also does not impose special restrictions on the purification step, as long as the unreacted small-molecule monomers and other impurities can be removed. The present invention preferably adopts dialysis for purification.

[0047] In the present invention, the quick-setting cement is a rapid-hardening sulphoaluminate cement with a strength grade of 42.5. The surfactant is selected from one or more of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, sodium alcohol polyoxyethylene ether sulfate or Tween-80.

[0048] In the present invention, the quartz sand includes quartz sand with particle sizes of 10 - 20 mesh and 30 - 40 mesh, and the mass ratio of the quartz sand with particle sizes of 10 - 20 mesh to that of 30 - 40 mesh is 1:(0.5 - 1.5). The compounding of quartz sand with different particle sizes in a certain proportion is mainly to optimize the performance and facilitate construction: from the perspective of performance, the large particle size provides greater friction, and the small particle size fills the gaps, jointly improving the anti-slip property, making the vehicle driving safer; at the same time, the combination of large and small particle sizes makes the particle gradation more reasonable, reduces the porosity, and enhances the density and strength. From the perspective of construction, a single particle size is prone to accumulation and segregation. After mixing different particle sizes, it can improve the fluidity and plasticity of the coating, making it easier to apply evenly during construction, ensuring the construction quality, and efficiently completing the road surface repair work.

[0049] The present invention also provides a preparation method of the above-mentioned road surface anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, which includes the following steps:

[0050] Mix quick-setting cement, composite nano-photocatalyst, quartz sand, silica fume and surfactant to obtain a dry mixture;

[0051] Add the surface-grafted amino composite resin emulsion into water and mix evenly, then pour it into the dry mixture and continue to stir evenly to obtain the product.

[0052] The present invention does not impose special restrictions on the mixing method and equipment, and common mixing methods and equipment in the art can be used.

[0053] The present invention also provides a usage method of the above-mentioned road surface anti-slip repair type coating for photocatalytic degradation of vehicle exhaust or the road surface anti-slip repair type coating for photocatalytic degradation of vehicle exhaust prepared by the above-mentioned preparation method, which includes the following steps:

[0054] Clean the road surface to be constructed, cover the road surface with the above-mentioned road surface anti-slip repair type coating for photocatalytic degradation of vehicle exhaust and apply it smoothly, and it can be opened to traffic after curing for 15 - 25 minutes.

[0055] It should be noted that the specific curing time depends on the ambient temperature. If the ambient temperature is relatively low, the curing time should be appropriately extended; if the ambient temperature is relatively high, the curing time should be appropriately shortened; as long as it is cured until the coating is completely solidified and reaches the expected strength standard.

[0056] The following further elaborates on the technical solution of the present invention in combination with specific embodiments.

[0057] The quick-setting cement used in the following examples is the sulfoaluminate cement with a strength grade of 42.5 sold by Jiangsu Baling Cement Co., Ltd.; the nano-titanium dioxide is the anatase titanium dioxide produced by Yicheng Jingna Environmental Protection Technology Co., Ltd., with a particle size of 10 - 30 nm; the nano-ATO is provided by Yicheng Jingna Environmental Protection Technology Co., Ltd., with a particle size of 10 - 30 nm; the waterborne polyurethane prepolymer and waterborne acrylate are provided by Shanghai Liji Technology Co., Ltd., and the solid content of both is 30 - 35%; acrylamide and ammonium persulfate are provided by Tianjin Zhonglian Chemical Reagent Co., Ltd., both of which are of analytical purity; the quartz sand is the black quartz sand sold by Jiangsu Xinyuan Sand and Gravel Yard, with particle sizes of 10 - 20 mesh and 30 - 40 mesh; the silica fume is the silica fume sold by Zhejiang Changxing Mingjiu Building Materials Co., Ltd., where the particle size of the silica fume is 0.1 - 0.2 μm, the specific surface area is 15 - 20 m 2 / g, and the specific gravity is 2.2 - 2.5 g / cm 3 , and the loose bulk density is 200 - 300 kg / m 3 ; the surfactant sodium dodecyl sulfate (SDS) is provided by Doumi Chemical Co., Ltd., with a purity greater than 99%. The parts in the following examples are all parts by mass.

[0058] In the following examples, the preparation method of the surface-grafted amino composite resin emulsion is as follows:

[0059] (1) In a three-necked flask equipped with a stirrer, a thermometer and a constant pressure funnel, add an appropriate amount of waterborne polyurethane prepolymer, and then add a certain amount of deionized water. Start stirring to make it evenly dispersed. Place the three-necked flask in a water bath and heat it to 55°C, stir evenly and preheat for 15 min.

[0060] (2) Slowly drip the aqueous acrylamide solution into the three-necked flask in step (1). The mass ratio of acrylamide to waterborne polyurethane prepolymer is 1:4; control the dripping to be completed within 40 min, and at the same time start stirring, set the rotation speed to 350 rpm. After the dripping is completed, keep the temperature at 55°C and continue stirring and reacting for 1.5 h to make acrylamide and waterborne polyurethane prepolymer mix preliminarily.

[0061] (3) Drip the aqueous ammonium persulfate solution (the mass of ammonium persulfate is 0.8% of the mass of acrylamide) into the reaction system in step (2), and control the dripping to be completed within 20 min. Then raise the temperature to 65°C and continue reacting for 5 h to initiate the graft polymerization reaction, so that the amino group of acrylamide is successfully grafted onto the waterborne polyurethane molecular chain.

[0062] (4)After the reaction is completed, transfer the reaction product into a dialysis bag and dialyze it in a large amount of deionized water for 3 days to remove unreacted acrylamide, initiator, and other small molecule impurities. After dialysis is completed, transfer the product to a rotary evaporator and remove part of the water at an appropriate temperature and vacuum to obtain an aqueous polyurethane product with a surface grafted amino group and a solid content of 30 - 35%.

[0063] (5)Mix the aqueous polyurethane product with a surface grafted amino group and aqueous polyacrylate evenly at a mass ratio of 1:1 at room temperature to obtain an aqueous composite resin emulsion with a surface grafted amino group.

[0064] Example 1

[0065] This example provides a road surface anti - skid repair type coating for photocatalytic degradation of vehicle exhaust. Its raw materials are: 25 parts of quick - setting cement; 2 parts of composite nano - photocatalyst (nano - titanium dioxide:nano - ATO = 1:1, mass ratio); 5 parts of aqueous composite resin emulsion with a surface grafted amino group; 15 parts of water; 40 parts of quartz sand (20 parts of 10 - 20 mesh and 20 parts of 30 - 40 mesh); 2 parts of silica fume; 4 parts of surfactant SDS.

[0066] Put the quick - setting cement, composite nano - photocatalyst, quartz sand, silica fume, and surfactant SDS in the above component raw materials into a mixing pot in sequence and dry - mix for 1 - 2 minutes until evenly stirred. At the same time, mix the aqueous composite resin emulsion with a surface grafted amino group evenly with water. Finally, pour the aqueous composite resin emulsion with a surface grafted amino group and water into the mixing pot and continue to stir for about 4 minutes to obtain the product.

[0067] Directly apply the prepared road surface anti - skid repair type coating for photocatalytic degradation of vehicle exhaust to the position to be repaired, scrape it flat, and cure for about 20 minutes.

[0068] Example 2

[0069] This example provides a road surface anti - skid repair type coating for photocatalytic degradation of vehicle exhaust. Its raw materials are: 30 parts of quick - setting cement; 2 parts of composite nano - photocatalyst (nano - titanium dioxide:nano - ATO = 1:1, mass ratio); 5 parts of aqueous composite resin emulsion with a surface grafted amino group; 15 parts of water; 40 parts of quartz sand (20 parts of 10 - 20 mesh and 20 parts of 30 - 40 mesh); 2 parts of silica fume; 3 parts of surfactant SDS.

[0070] Put the quick - setting cement, composite nano - photocatalyst, quartz sand, silica fume, and surfactant SDS in the above component raw materials into a mixing pot in sequence and dry - mix for 1 - 2 minutes until evenly stirred. At the same time, mix the aqueous composite resin emulsion with a surface grafted amino group evenly with water. Finally, pour the aqueous composite resin emulsion with a surface grafted amino group and water into the mixing pot and continue to stir for about 4 minutes to obtain the product.

[0071] Example 3

[0072] This embodiment provides a road anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, and its raw materials are: 25 parts of quick-setting cement; 4 parts of composite nano-photocatalyst (nano-titanium dioxide: nano-ATO = 1:1, mass ratio); 5 parts of surface-grafted amino composite resin emulsion; 15 parts of water; 40 parts of quartz sand (20 parts of 10 - 20 mesh, 20 parts of 30 - 40 mesh); 2 parts of silica fume; 4 parts of surfactant SDS.

[0073] Put the quick-setting cement, composite nano-photocatalyst, quartz sand, silica fume, and surfactant SDS in the above component raw materials into the mixing pot in sequence and dry mix for 1 - 2 minutes until evenly stirred. At the same time, mix the surface-grafted amino composite resin emulsion evenly with water. Finally, pour the surface-grafted amino composite resin emulsion and water into the mixing pot and continue to stir for about 4 minutes to obtain it.

[0074] Example 4

[0075] This embodiment provides a road anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, and its raw materials are: 25 parts of quick-setting cement; 2 parts of composite nano-photocatalyst (nano-titanium dioxide: nano-ATO = 1:1, mass ratio); 5 parts of surface-grafted amino composite resin emulsion; 15 parts of water; 45 parts of quartz sand (22 parts of 10 - 20 mesh, 23 parts of 30 - 40 mesh); 2 parts of silica fume; 4 parts of surfactant SDS.

[0076] Put the quick-setting cement, composite nano-photocatalyst, quartz sand, silica fume, and surfactant SDS in the above component raw materials into the mixing pot in sequence and dry mix for 1 - 2 minutes until evenly stirred. At the same time, mix the surface-grafted amino composite resin emulsion evenly with water. Finally, pour the surface-grafted amino composite resin emulsion and water into the mixing pot and continue to stir for about 4 minutes to obtain it.

[0077] Example 5

[0078] This embodiment provides a road anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, and its raw materials are: 25 parts of quick-setting cement; 2 parts of composite nano-photocatalyst (nano-titanium dioxide: nano-ATO = 1:1, mass ratio); 8 parts of surface-grafted amino composite resin emulsion; 15 parts of water; 40 parts of quartz sand (20 parts of 10 - 20 mesh, 20 parts of 30 - 40 mesh); 2 parts of silica fume; 4 parts of surfactant SDS.

[0079] Put the quick-setting cement, composite nano-photocatalyst, quartz sand, silica fume, and surfactant SDS in the above component raw materials into the mixing pot in sequence and dry mix for 1 - 2 minutes until evenly stirred. At the same time, mix the surface-grafted amino composite resin emulsion evenly with water. Finally, pour the surface-grafted amino composite resin emulsion and water into the mixing pot and continue to stir for about 4 minutes to obtain it.

[0080] Comparative Example 1

[0081] Compared with Example 1, the difference in this comparative example is that the composite nano-photocatalyst is not added, and the missing part is supplemented with a surface-grafted amino composite resin emulsion, that is, the surface-grafted amino composite resin emulsion is 7 parts.

[0082] Comparative Example 2

[0083] Compared with Example 1, the difference in this comparative example is that the surface-grafted amino composite resin emulsion is not added, and the missing part is supplemented with a composite nano-photocatalyst, that is, the composite nano-photocatalyst is 7 parts.

[0084] Comparative Example 3

[0085] Compared with Example 1, the difference in this comparative example is that the surface-grafted amino composite resin emulsion is replaced with a polyurethane and acrylate composite emulsion; the polyurethane and acrylate composite emulsion is obtained by blending an aqueous polyurethane emulsion and an aqueous acrylate emulsion in a mass ratio of 1:1.

[0086] Comparative Example 4

[0087] Compared with Comparative Example 3, the difference in this comparative example is that the composite nano-photocatalyst is not added, and the amount of the polyurethane and acrylate composite emulsion is 7 parts.

[0088] Comparative Example 5

[0089] Compared with Example 1, the difference in this comparative example is that the surface-grafted amino composite resin emulsion is replaced with a waterborne polyurethane product grafted with amino groups on the surface, that is, the waterborne acrylate emulsion is not added in this comparative example.

[0090] Comparative Example 6

[0091] Compared with Example 1, the difference in this comparative example is that the composite nano-photocatalyst is replaced with nano-titanium dioxide.

[0092] Comparative Example 7

[0093] Compared with Example 1, the difference in this comparative example is that the compound quartz sand is replaced with quartz sand of a single particle size of 10 - 20 mesh.

[0094] Test Example

[0095] 1. Determination of the friction performance and mechanical properties of the coating:

[0096] The pavement repair coatings of Examples 1 - 5 and Comparative Examples 1 - 7 were tested for texture depth, friction coefficient, 28-day compressive strength, 28-day flexural strength, and 28-day dry shrinkage rate. The results are shown in Table 1, and the test methods are as follows:

[0097] Apply the pavement repair type coating directly onto the rutting plate of AC-13 asphalt mixture, with the application area being 30*30 cm 2 and the thickness being 0.4 cm;

[0098] (1) Texture depth and friction performance: Conduct tests in accordance with the "Field Test Procedures for Highway Subgrade and Pavement" JTG 3450-2019: T0964-2008 Method for Testing the Friction Coefficient of Pavement by Pendulum Tester, T0961-1995 Method for Testing the Texture Depth of Pavement by Manual Sand Spreading Method;

[0099] (2) 28-day compressive strength, 28-day flexural strength, and 28-day dry shrinkage rate: Conduct tests in accordance with the "Test Procedures for Cement and Cement Concrete in Highway Engineering" JTG 3420-2020: T0506-2005 Method for Testing the Strength of Cement Mortar (ISO Method), T0511-2005 Method for Testing the Dry Shrinkage of Cement Mortar.

[0100] It can be seen from Table 1 that the texture depth, friction coefficient, 28-day compressive strength, 28-day flexural strength, 28-day dry shrinkage rate, etc. of each embodiment in the present invention all meet the relevant requirements in the specifications. In particular, the friction performance, flexural strength, and compressive strength are all at a relatively good level. The increase in the amount of quartz sand will further improve the anti-skid performance. The increase in the amounts of quick-setting cement, quartz sand, and surface-grafted amino composite resin emulsion will all improve the compressive and flexural strengths of the coating, among which the increase in the amount of surface-grafted amino composite resin emulsion has the most obvious improvement on the coating strength. The 28-day dry shrinkage rates of the coatings in Examples 1 to 5 are all very small, and the change in the coating components has almost no effect on this performance.

[0101] Table 1 Performance data of pavement repair type coatings in examples and comparative examples

[0102]

[0103] In Comparative Example 1, a composite emulsion was used to replace the composite nano-catalyst. Since the increase in the polymer emulsion made the surface of the coating smooth, the friction coefficient decreased. At the same time, the strength increased to a certain extent, but the increase amplitude was small. There was no obvious influence on other properties. In Comparative Example 2, a composite photocatalyst was used to replace the composite emulsion. On the contrary to Comparative Example 1, the decrease in the polymer led to an improvement in the anti-slip performance. At the same time, the strength performance decreased significantly. There was no obvious influence on other properties. In Comparative Example 3, the surface-grafted amino composite resin emulsion was replaced by a polyurethane and acrylate composite emulsion, which had no obvious influence on the friction performance and mechanical properties of the coating. In Comparative Example 4, compared with Comparative Example 3, the friction coefficient decreased due to the increase in the polymer emulsion. At the same time, the strength increased to a certain extent, but the increase amplitude was small. There was no influence on other properties. In Comparative Example 5, the aqueous acrylate emulsion was not added, so the strength performance of the coating decreased. In Comparative Example 6, nano-titanium dioxide was used to replace the composite nano-photocatalyst, which had no obvious influence on the coating properties. In Comparative Example 7, quartz sand with a single particle size of 10 - 20 mesh was used to replace the compounded quartz sand. The texture depth of the coating increased significantly, which would cause the hazard of quartz sand granule detachment during the use of the coating. At the same time, the use of quartz sand with a single particle size reduced the density of the coating, resulting in a decrease in the strength of the coating.

[0104] 2. Determination of coating degradation performance:

[0105] The road surface to be constructed was cleaned. The road surface repair coatings of Examples 1 - 5 and Comparative Examples 1 - 6 were covered on the polished road surface and applied evenly. After 24 hours of construction, an automotive exhaust gas analyzer was used to detect the air on the road surface, and the cumulative degradation rates of CO, HC (hydrocarbons), CO2, and NO were calculated. The relevant data measured in the area without the applied coating was used as the blank control group. The test results are shown in Table 2.

[0106] Table 2 Cumulative degradation rates of the road surface repair coatings of Examples 1 - 5 and Comparative Examples 1 - 6 for vehicle exhaust (%)

[0107]

[0108] Table 2 shows that, compared with the area without the painted coating, the cumulative degradation rates of CO, HC, CO2, and NO in Examples 1-5 can be increased by 40-71% relative to the blank control group, achieving an excellent purification effect. Both the composite nano-photocatalyst and the surface-grafted amino composite resin emulsion can significantly improve the degradation of tail gas by the coating. Among them, the increase in the dosage of the composite nano-photocatalyst is more conducive to improving the degradation of tail gas by the coating. This is not only because the nano-composite catalyst itself has a more excellent tail gas degradation effect, but also because the surface-grafted amino composite resin emulsion can provide a stable attachment environment for the composite nano-photocatalyst, increase the active sites, expand the photocatalytic function, improve the dispersion condition, and reduce its agglomeration effect, so that the composite nano-photocatalyst is more uniformly mixed in the coating and has a larger contact area with the tail gas, and finally can maximize its catalytic effect.

[0109] In Comparative Example 1, the surface-grafted amino composite resin emulsion was used to replace the composite nano-catalyst. The removal of the composite nano-catalyst reduced the degradation rate of the coating for all tail gas components. Since the polymer emulsion also has a certain reaction activity, the degradation rate is higher compared to the degradation of the tail gas in the non-painted area.

[0110] In Comparative Example 2, the composite photocatalyst was used to replace the surface-grafted amino composite resin emulsion. The increase in the composite photocatalyst increased the tail gas degradation rate. However, due to the lack of the synergistic effect of the composite emulsion and the composite nano-catalyst and the auxiliary decomposition of nitrogen oxides, the degradation rate of the coating for the tail gas was only slightly increased relative to Example 1 under this formulation, but was significantly lower than the degradation rate of Example 3.

[0111] In Comparative Example 3, the aqueous polyurethane prepolymer was not copolymerized with acrylamide, weakening the synergistic effect of the composite emulsion and the composite nano-catalyst and the auxiliary decomposition of nitrogen oxides, and the degradation rate of the coating for the tail gas decreased.

[0112] In Comparative Example 4, the composite nano-catalyst was removed and the aqueous polyurethane prepolymer in the composite emulsion was not copolymerized with acrylamide. Therefore, this coating does not have the function of tail gas degradation and is equivalent to the data of the blank control group without the painted coating.

[0113] In Comparative Example 5, the aqueous acrylate emulsion was not added, and the content of the modified polyurethane increased, which improved the tail gas degradation function of the coating to a certain extent, but the strength of the coating was weakened under this formulation.

[0114] In Comparative Example 6, nano-titanium dioxide was used to replace the composite nano-photocatalyst, lacking the synergistic effect of the composite nano-catalyst itself, and the tail gas degradation function of the coating for the tail gas decreased to a certain extent.

[0115] In Comparative Example 7, 10-20 mesh single-sized quartz sand was used to replace the compounded quartz sand, and there was no obvious effect on the tail gas degradation function of the coating.

[0116] Generally speaking, due to the addition of quick-setting cement, composite nano-photocatalyst, quartz sand, surface-grafted amino composite resin emulsion, silica fume, surface catalyst SDS, etc. in the road anti-slip repair type coating for photocatalytic degradation of automobile exhaust in Embodiments 1-5 of the present invention, the anti-slip property, anti-shrinkage property, compressive and flexural strengths, compression-flexure ratio, etc. of the coating are significantly improved compared with ordinary coatings, and it has an excellent decomposition effect on automobile exhaust, with practical application value and worthy of promotion.

[0117] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A road anti-slip repair type coating for photocatalytic degradation of vehicle exhaust, characterized in that It comprises components in the following parts by mass: 25 - 30 parts of quick - setting cement; 2 - 4 parts of composite nano - photocatalyst; the composite nano - photocatalyst comprises nano - titanium dioxide and nano - ATO; 5 - 8 parts of surface - grafted amino composite resin emulsion; the surface - grafted amino composite resin emulsion is obtained by blending aqueous acrylate emulsion and aqueous polyurethane emulsion with amino groups on the surface; the preparation process of the aqueous polyurethane emulsion with amino groups on the surface is as follows: acrylamide is mixed with aqueous polyurethane prepolymer, and then an aqueous solution of thermal initiator is added for graft polymerization, and after purification, an aqueous polyurethane emulsion with amino groups on the surface is obtained; 10 - 15 parts of water; 40 - 45 parts of quartz sand; 1 - 2 parts of silica fume; 3 - 5 parts of surfactant.

2. The road anti-slip repair type coating for photocatalytic degradation of vehicle exhaust according to claim 1, characterized in that, The mass ratio of the nano - titanium dioxide to the nano - ATO is 1:(0.5 - 1.5).

3. The anti-slip repair type coating for road surface for photocatalytic degradation of vehicle exhaust according to claim 1, characterized in that The mass ratio of the aqueous acrylate emulsion to the aqueous polyurethane emulsion with amino groups on the surface is 1:(0.5 - 1.5); the solid content of the aqueous acrylate emulsion is 30 - 35%, and the solid content of the aqueous polyurethane emulsion with amino groups on the surface is 30 - 35%.

4. The road anti-slip repair type coating for photocatalytic degradation of vehicle exhaust according to claim 1, characterized in that, The mass ratio of the acrylamide to the aqueous polyurethane prepolymer is 1:(3 - 5); the thermal initiator is selected from potassium persulfate, sodium persulfate or ammonium persulfate.

5. The anti-slip repair type coating for road surface for photocatalytic degradation of vehicle exhaust according to claim 1, characterized in that, The quick - setting cement is rapid - hardening sulphoaluminate cement with a strength grade of 42.5; the surfactant is selected from one or more of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, sodium lauryl polyoxyethylene ether sulfate or Tween - 80.

6. The anti-slip repair type coating for road surface for photocatalytic degradation of vehicle exhaust gas according to claim 1, wherein, The quartz sand comprises quartz sand with particle sizes of 10 - 20 mesh and 30 - 40 mesh, and the mass ratio of the quartz sand with particle sizes of 10 - 20 mesh to that of 30 - 40 mesh is 1:(0.5 - 1.5).

7. The preparation method of the road surface anti-slip repair type coating for photocatalytic degradation of automobile exhaust according to any one of claims 1 to 6, characterized in that, It comprises the following steps: Mix the quick - setting cement, composite nano - photocatalyst, quartz sand, silica fume and surfactant to obtain a dry - mix material; Add the surface - grafted amino composite resin emulsion into water and mix evenly, then pour it into the dry - mix material and continue to stir evenly to obtain the product.

8. The method of using the photocatalytic degradation automotive exhaust road anti - skid repair coating according to any one of claims 1 - 6 or the photocatalytic degradation automotive exhaust road anti - skid repair coating prepared by the preparation method according to claim 7, comprises the following steps: Clean the road surface to be constructed, cover the photocatalytic degradation automotive exhaust road anti - skid repair coating on the road surface and spread it flat, and it can be opened to traffic after curing for 15 - 25 min.

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