Pavement coating material with tail gas degradation and CO2 adsorption capacities and preparation method

Abstract

The invention provides a pavement coating material with tail gas degradation and CO2 adsorption capacities and a preparation method thereof. Epoxy resin is used as a matrix, polyethyleneimine is loaded on fumed silica through an impregnation method to form a CO2 adsorbent, nano titanium dioxide and a long afterglow material are compounded to realize photocatalytic degradation of tail gas pollutants at the same time, the coating curing time is optimized by controlling the addition amount of polyethyleneimine, and the water resistance is ensured; the catalytic activity in a dark environment is maintained through the long afterglow material, and the coating can degrade NOx, CH and CO and adsorb CO2 under weak light and strong light. By balancing the proportion of adsorption and photocatalysis components, the limitation that a traditional material is single in function, high in light dependence and the like is broken through, efficient tail gas purification and CO2 adsorption are still maintained under the dim light / dark condition, the material is suitable for changeable scenes such as the urban road peak period, and a comprehensive solution is provided for road area pollution treatment and carbon neutralization targets.

Description

Technical Field

[0001] The present invention relates to the technical field of CO2 adsorption materials for road engineering, and in particular to a road coating material with exhaust gas degradation and CO2 adsorption capabilities and a preparation method thereof. Background Art

[0002] As the world pays more and more attention to environmental protection and sustainable development, the treatment of road exhaust and carbon dioxide has become an urgent problem to be solved. Global road traffic contributes about 20% of nitrogen oxides (NO x ), 40% of volatile organic compounds (VOCs) and 30% of carbon monoxide (CO), NO x Photochemical reactions with VOCs generate ozone (O3) and secondary particulate matter (PM2.5), directly contributing to respiratory illnesses and photochemical smog. Furthermore, the transportation sector accounts for 24% of global energy-related CO2 emissions, with an average annual growth rate of 1.7%. These substances not only pose a threat to human health but also cause serious environmental pollution.

[0003] Traditional exhaust gas treatment technology mainly relies on catalytic converters, among which three-way catalytic converters are the most widely used technology. Three-way catalytic conversion technology can simultaneously treat CO, HC and NO x , but it has some limitations, such as strict requirements on air-fuel ratio, high cost of precious metal catalysts and low efficiency under low temperature conditions. In addition to on-board exhaust gas treatment technology, exhaust gas treatment in road environment has also received attention. Some existing technologies have developed functional pavement materials that can treat exhaust pollutants near the road surface through photocatalytic degradation or adsorption. For example, pavement materials doped with titanium dioxide (TiO2) show good NO under light conditions. x Degradation ability. TiO2, as a typical photocatalyst, can produce free radicals with strong oxidizing ability under ultraviolet light, thereby xDecomposed into harmless nitrogen and water. However, the degradation efficiency of this photocatalytic material is significantly affected by light intensity and ambient humidity. In low light or high humidity conditions, the photocatalytic activity of TiO2 decreases significantly, limiting its practical application. Furthermore, TiO2-based materials have relatively limited capacity for CO and HC, and their adsorption or conversion of CO2 is almost zero. Regarding CO2 capture, traditional carbon dioxide capture technologies include chemical absorption, physical adsorption, and membrane separation. Chemical absorption captures CO2 through a chemical reaction between amine compounds and CO2, but this method suffers from high energy consumption, difficulty in absorbent regeneration, and equipment corrosion. Physical adsorption utilizes the pore structure of the adsorbent to adsorb CO2, but its adsorption capacity is limited and requires strict regeneration conditions. Membrane separation separates CO2 through selectively permeable membranes, but its separation efficiency is limited by the membrane material properties and operating conditions, and its cost is high. These traditional technologies are mostly suitable for industrial emission sources and are ineffective for capturing low-concentration, dispersed CO2 emissions in road environments, making resource utilization difficult.

[0004] With the increasing demand for environmental protection and sustainable development, the integration of roadside exhaust gas treatment and CO2 adsorption technology has become an inevitable trend. This integrated technology not only effectively controls multiple pollutants in exhaust gas, but also reduces CO2 emissions and slows the greenhouse effect, achieving comprehensive pollution control and carbon emission reduction. Summary of the Invention

[0005] In light of this, the present invention proposes a pavement coating material and preparation method capable of both exhaust gas degradation and CO₂ adsorption. By controlling the material ratio and preparation process, the pavement coating of the present invention not only degrades exhaust gas in traffic environments, but also achieves efficient CO₂ adsorption and exhibits excellent weather resistance.

[0006] The technical solution of the present invention is achieved as follows:

[0007] In one aspect, the present invention provides a method for preparing a pavement coating material having exhaust gas degradation and CO2 adsorption capabilities, preferably comprising the following steps:

[0008] S1, stirring and mixing anhydrous ethanol and polyethyleneimine, then adding fumed silica and stirring and mixing again, drying, and cooling to finally obtain a CO2 adsorbent;

[0009] S2, stirring and mixing the epoxy resin and the epoxy resin diluent, then adding the silane coupling agent, stirring and mixing to obtain a mixed solution;

[0010] S3, adding the CO2 adsorbent in step S1 to the mixed solution in step S2, adding nano titanium dioxide, adding a film-forming aid alcohol ester dodecahydrate and a defoaming agent, stirring, adding an epoxy resin curing agent, and stirring again to obtain a road coating with exhaust gas degradation and CO2 adsorption capabilities.

[0011] Based on the above scheme, preferably, in step S1, the polyethyleneimine is 8 to 10 parts by weight. 、 The amount of anhydrous ethanol is 8 to 10 parts, and the amount of fumed silica is 1 to 1.5 parts.

[0012] Based on the above scheme, preferably, the mass ratio of anhydrous ethanol, polyethyleneimine and fumed silica is 8: (8-10): (1-1.2).

[0013] On the basis of the above scheme, it is further preferred that, in parts by weight, the anhydrous ethanol is 8 parts, the polyethyleneimine is 8 parts, and the fumed silica is 1 part, that is, the mass ratio of anhydrous ethanol, polyethyleneimine and fumed silica is 8:8:1, and the purity of the polyethyleneimine is 99%.

[0014] Based on the above solution, preferably, in step S3, nano titanium dioxide and long afterglow material are added simultaneously.

[0015] Based on the above scheme, preferably, in step S1, the specific surface area of ​​the fumed silica is ≥120m 2 / g (purity ≥99%), fumed silica has a very high surface area and a porous structure, which ensures that more contact area can be provided to load polyethyleneimine. At the same time, this structure helps to uniformly disperse polyethyleneimine and can serve as an adsorption site to improve the adsorption efficiency of CO2; the stirring is stirring at a speed of 140 to 160 r / min for 13 to 17 minutes; the stirring again is stirring at a speed of 80 to 120 r / min for 18 to 22 minutes; the drying is drying in an oven at 50 to 70°C for 10 to 14 hours;

[0016] Based on the above scheme, it is further preferred that polyethyleneimine and anhydrous ethanol are placed in a clean beaker, stirred at a speed of 150 r / min for 15 minutes using a magnetic stirrer, fumed silica is added to the above solution and stirred at a speed of 100 r / min for 20 minutes, and the beaker containing the mixture is placed in an oven preheated to 60°C for 12 hours to ensure that the anhydrous ethanol is completely volatilized. The beaker is taken out and cooled to room temperature to finally obtain a CO2 adsorbent.

[0017] Based on the above solution, preferably, in step S2, the molecular weight of the epoxy resin is 350-450.

[0018] On the basis of the above scheme, preferably, in steps S2 and S3, the epoxy resin is 15-20 parts, the epoxy resin diluent is 8-10 parts, the silane coupling agent is 5-6 parts, the nano titanium dioxide is 4-8 parts, the long afterglow material is 4-8 parts, the film-forming aid alcohol ester is 5-6 parts, the defoaming agent is 1-1.5 parts, and the epoxy resin curing agent is 8-10 parts;

[0019] On the basis of the above scheme, it is further preferred that in steps S2 and S3, the epoxy resin is 16 parts, the epoxy resin diluent is 8 parts, the silane coupling agent is 6 parts, the nano titanium dioxide is 4 parts, the long afterglow material is 4 parts, the film-forming aid alcohol ester is 5 parts, the defoaming agent is 1 part, and the epoxy resin curing agent is 8 parts; wherein the silane coupling agent type is KH 570 (purity ≥98%), which can improve the bonding strength between the coating and the road substrate; the type of the film-forming aid alcohol ester is 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (purity ≥95%), which mainly improves the coating performance, enhances adhesion, and improves the flexibility and weather resistance of the coating in the coating; the type of the defoaming agent is 1,2-dichloropropylene (purity GR), which is used in the coating to reduce foam, prevent pinholes, ensure uniform and smooth coating, and improve coating quality; the type of the long afterglow material is SrAl2O4:Eu 2+ ,Dy 3+ ; The epoxy resin curing agent type is T31 curing agent.

[0020] Based on the above scheme, preferably, in steps S2 and S3, the mass ratio of the epoxy resin, epoxy resin diluent and epoxy resin curing agent is 2:(0.8~1.2):(0.8~1.2); further preferably, the mass ratio of the epoxy resin, epoxy resin diluent and epoxy resin curing agent is 2:1:1.

[0021] On the basis of the above scheme, preferably, in step S3, the stirring is carried out at a rotation speed of 130 to 170 r / min for 16 to 20 min; and the further stirring is carried out at a rotation speed of 90 to 110 r / min for 4 to 6 min.

[0022] On the basis of the above scheme, it is further preferred to add epoxy resin and epoxy resin diluent to a beaker and stir at a speed of 100 r / min for 10 minutes, add silane coupling agent to the above mixed solution, stir at a speed of 100 r / min for 5 minutes, add CO2 adsorbent, nano titanium dioxide, long afterglow material, and then add film-forming aid alcohol ester twelve and defoaming agent, stir the mixture at a speed of 150 r / min for 18 minutes, finally, add epoxy resin curing agent and stir at a speed of 100 r / min for 5 minutes, and a road coating with exhaust gas degradation and CO2 adsorption capabilities can be obtained.

[0023] In a second aspect, a road surface coating having exhaust gas degradation and CO2 adsorption capabilities is provided, which is prepared by the preparation method described in the first aspect.

[0024] On the third aspect, a road coating with exhaust gas degradation and CO2 adsorption capabilities is provided for use in asphalt pavements. Preferably, the coating with CO2 absorption capabilities is evenly applied on the road surface with a brush and then cured at room temperature for 6-8 hours.

[0025] The pavement coating with exhaust gas degradation and CO2 adsorption capabilities and its preparation method of the present invention have the following beneficial effects compared to the prior art:

[0026] (1) By using epoxy resin as a matrix, polyethyleneimine is loaded on fumed silica to form a CO2 adsorbent, and nano-titanium dioxide and long afterglow materials are compounded to simultaneously achieve photocatalytic degradation of exhaust pollutants and CO2 adsorption; the high surface area and porous structure of fumed silica provide more contact area to load polyethyleneimine, which helps to uniformly disperse polyethyleneimine and improve the adsorption efficiency of CO2. Nano-titanium dioxide can degrade exhaust gases such as CO, HC and NOx under photocatalytic conditions, while the long afterglow material maintains catalytic activity in a lightless environment;

[0027] (2) Polyethyleneimine helps epoxy resin cure. By controlling the amount of polyethyleneimine added, the appropriate curing time of the pavement coating can be controlled, and it also helps ensure the water resistance of the coating.

[0028] (3) By maintaining catalytic activity in a lightless environment through long afterglow materials, the limitations of traditional materials such as single function and strong light dependence are broken through. High-efficiency exhaust gas purification and CO2 adsorption are still maintained under weak light / no light conditions. It is suitable for changing scenarios such as urban road rush hour, providing a comprehensive solution for road pollution control and carbon neutrality goals. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The long afterglow material SrAl2O4:Eu used in the present invention 2+ ,Dy 3+ The products were purchased from Chuangrong Chemical Technology Co., Ltd., silane coupling agent KH 570, nano titanium dioxide, polyethyleneimine, anhydrous ethanol, and defoaming agent were purchased from Beijing Mairida Technology Co., Ltd., and fumed silica, epoxy resin, epoxy resin curing agent, and film-forming aid alcohol ester twelve were purchased from Shanghai Yien Chemical Technology Co., Ltd.

[0031] Example 1

[0032] Step 1: Preparation of CO2 adsorbent by impregnation method:

[0033] Place 8g of anhydrous ethanol and 8g of polyethyleneimine in a clean beaker and stir at 150r / min for 15 minutes using a magnetic stirrer; add 1g of fumed silica to the above solution and stir at 100r / min for 20 minutes; place the beaker containing the mixture in an oven preheated to 60°C for 12 hours to ensure complete volatilization of the anhydrous ethanol; take out the beaker and cool it to room temperature to finally obtain a CO2 adsorbent.

[0034] Step 2: Preparation of coatings with exhaust gas degradation and CO2 adsorption capabilities

[0035] Add 16g of epoxy resin and 8g of epoxy resin diluent into a beaker and stir at a speed of 100r / min for 10min; add 6g of silane coupling agent to the above mixed solution and stir at a speed of 100r / min for 5min; add the CO2 adsorbent prepared in all steps 1, 4g of nano titanium dioxide and 4g of long afterglow material, then add 5g of film-forming aid alcohol ester dodecahydrate and 1g of defoaming agent, and stir the mixture at a speed of 150r / min for 18min; finally, add 8g of epoxy resin curing agent and stir at a speed of 100r / min for 5min to obtain a road coating with exhaust gas degradation and CO2 adsorption capabilities.

[0036] Step 3: Coating and curing

[0037] Use a brush to evenly apply 50g of the paint on the rutting board and wait for the coating to cure naturally.

[0038] Example 2

[0039] Step 1: Preparation of CO2 adsorbent by impregnation method:

[0040] Place 8g of anhydrous ethanol and 8g of polyethyleneimine in a clean beaker and stir at 150r / min for 15 minutes using a magnetic stirrer; add 1.2g of fumed silica to the above solution and stir at 100r / min for 20 minutes; place the beaker containing the mixture in an oven preheated to 60°C for 12 hours to ensure complete volatilization of the anhydrous ethanol; take out the beaker and cool it to room temperature to finally obtain a CO2 adsorbent.

[0041] Step 2: Preparation of coatings with exhaust gas degradation and CO2 adsorption capabilities

[0042] Add 18g of epoxy resin and 10g of epoxy resin diluent into a beaker and stir at a speed of 100r / min for 10min; add 8g of silane coupling agent to the above mixed solution and stir at a speed of 100r / min for 5min; add the CO2 adsorbent prepared in all steps 1, 8g of nano-titanium dioxide and 8g of long afterglow material, then add 1g of film-forming aid alcohol ester dodecahydrate and 1g of defoaming agent, and stir the mixture at a speed of 150r / min for 15min; finally, add 8g of epoxy resin curing agent and stir at a speed of 100r / min for 5min to obtain a road coating with exhaust gas degradation and CO2 adsorption capabilities.

[0043] Step 3: Coating and curing

[0044] Use a brush to evenly apply 50g of the paint on the rutting board and wait for the coating to cure naturally.

[0045] Example 3

[0046] This comparative example is the same as Example 1, except that 9 g of polyethyleneimine was added in step 1.

[0047] Example 4

[0048] This comparative example is the same as Example 1, except that 10 g of polyethyleneimine was added in step 1.

[0049] Comparative Example 1

[0050] This comparative example is the same as Example 1, except that 8 g of nano titanium dioxide is added in step 2, and no long afterglow material is added.

[0051] Comparative Example 2

[0052] This comparative example is the same as Example 1, except that 12 g of polyethyleneimine was added in step 1.

[0053] Comparative Example 3

[0054] This comparative example is the same as Example 1, except that 6 g of polyethyleneimine was added in step 1.

[0055] Comparative Example 4

[0056] Step 1: Preparation of coating with tail gas degradation capability

[0057] 16 g of epoxy resin and 8 g of epoxy resin diluent are added to a beaker and stirred at a speed of 100 r / min for 10 minutes; 6 g of silane coupling agent is added to the mixed solution and stirred at a speed of 100 r / min for 5 minutes; 4 g of nano titanium dioxide and 4 g of long afterglow material are added, followed by 5 g of film-forming aid alcohol ester dodecahydrate and 1 g of defoaming agent, and the mixture is stirred at a speed of 150 r / min for 18 minutes; finally, 8 g of epoxy resin curing agent is added and stirred at a speed of 100 r / min for 5 minutes to obtain a road coating with exhaust gas degradation.

[0058] Step 2: Coating and curing

[0059] Use a brush to evenly apply 50g of the paint on the rutting board and wait for the coating to cure naturally.

[0060] Comparative Example 5

[0061] Step 1: Preparation of CO2 adsorbent by impregnation method:

[0062] Place 8g of anhydrous ethanol and 8g of polyethyleneimine in a clean beaker and stir at 150r / min for 15 minutes using a magnetic stirrer; add 1g of fumed silica to the above solution and stir at 100r / min for 20 minutes; place the beaker containing the mixture in an oven preheated to 60°C for 12 hours to ensure complete volatilization of the anhydrous ethanol; take out the beaker and cool it to room temperature to finally obtain a CO2 adsorbent.

[0063] Step 2: Preparation of coating with CO2 adsorption capacity

[0064] Add 16g of epoxy resin and 8g of epoxy resin diluent into a beaker and stir at a speed of 100r / min for 10min; add 6g of silane coupling agent to the above mixed solution and stir at a speed of 100r / min for 5min; add the CO2 adsorbent prepared in all steps 1, and then add 5g of film-forming aid alcohol ester dodecahydrate and 1g of defoaming agent, and stir the mixture at a speed of 150r / min for 18min; finally, add 8g of epoxy resin curing agent and stir at a speed of 100r / min for 5min to obtain a road coating with exhaust gas degradation and CO2 adsorption capabilities.

[0065] Step 3: Coating and curing

[0066] Use a brush to evenly apply 50g of the paint on the rutting board and wait for the coating to cure naturally.

[0067] Test results

[0068] 1. Coating curing time

[0069] The curing time of the pavement coating directly affects its physical properties, durability and construction efficiency. If the curing time is not enough, the coating may not be completely hardened, resulting in insufficient structural strength and easy damage. There is also the problem of adhesion. If it is not completely cured, the bonding between the coating and the pavement may not be strong and easy to peel off. Too long a curing time will delay traffic opening and increase costs. Table 1 shows the curing time of the coating. It can be seen that polyethyleneimine can promote the curing of the pavement coating. The appropriate amount of polyethyleneimine added helps to control the appropriate curing time. After increasing the amount of polyethyleneimine added in Comparative Example 2, the curing time was greatly shortened. After reducing the amount of polyethyleneimine added in Comparative Examples 3 and 4, the curing time was greatly extended, which may cause traffic delays.

[0070] Table 1 Coating curing time test results

[0071]

[0072]

[0073] 2. Water resistance test of coating

[0074] Pavement coatings need to withstand complex conditions such as rainwater immersion, humid air, and snow-melting agent corrosion for a long time. Water penetration will cause the adhesion between the coating and the asphalt pavement to decrease, causing peeling, blistering or cracking, which is especially obvious in areas with large temperature differences or frequent freeze-thaw. Therefore, the immersion test can expose its potential defects in advance. The specific experimental steps are as follows: First, place the Marshall specimen coated with paint facing down in a container, and add deionized water to 2 / 3 of the height of the specimen for immersion. After 24 hours of continuous water immersion treatment, take out the specimen and use filter paper to absorb the moisture on the surface. Subsequently, the specimen is subjected to a comprehensive visual inspection to record whether there are defects such as discoloration, blistering, peeling, wrinkles, rust or loss of gloss on the coating surface. The results are shown in Table 2.

[0075] Table 2 Water immersion test results of coating

[0076]

[0077]

[0078] As shown in Table 2, the coating of Comparative Example 2 fell off after 24 hours of immersion in water, while there were no defects in the other cases. The coating shedding indicates that the hydrophilic amino groups (-NH-, -NH2) of the excessive polyethyleneimine caused the shedding problem. The water resistance of Comparative Example 2 decreased relative to Examples 1, 2, and Comparative Example 1. The reason may be that the polyethyleneimine molecules contain a large number of hydrophilic amino groups such as primary amines and secondary amines. These groups easily form hydrogen bonds with water molecules, increasing the water absorption of the coating. The strong hydrophilicity of polyethyleneimine is the core factor that causes the coating water resistance to decline. Excessive addition will aggravate water penetration by introducing hydrophilic groups, destroying the structural density, and causing swelling, thereby causing the structure of the coating to be destroyed. Therefore, in order to optimize the test efficiency, the tail gas degradation effect and CO2 absorption effect of the coating prepared in Comparative Example 2 were no longer tested. According to the curing time, the curing time of Comparative Example 3 was too long compared to the other cases, so the coating prepared in Comparative Example 3 was not tested for tail gas degradation effect and CO2 absorption effect.

[0079] To test the coating's tail gas degradation and CO2 adsorption effects, the coating was applied with a brush to the surface of a rutting board (300 mm × 300 mm × 50 mm) formed indoors. After curing for 6-8 hours, tail gas was introduced into the test device. Different lighting conditions were set to test the coating's CO2 adsorption effect and the degradation of NO, CH, and CO in the tail gas. The results are shown in Table 2. To evaluate the coating's tail gas degradation and carbon fixation effects, the degradation rate η was used as an evaluation indicator. The degradation rate was calculated as shown in Formula (1):

[0080]

[0081] Where C1 is the concentration of each gas at the start of the test, and C2 is the concentration of each gas at the end of the test. After the coating was fully cured, the exhaust gas degradation effect and CO2 adsorption were evaluated using an automotive exhaust gas analyzer under strong light, weak light, and no light conditions. The results are shown in Table 3-7.

[0082] The degradation effect of the coating prepared according to the process of Example 1 on NOx, CH and CO in the exhaust gas and the CO2 adsorption effect are shown in Table 3.

[0083] Table 3 NOx, CH and CO degradation and CO2 adsorption results of Example 1

[0084]

[0085]

[0086] The tail gas degradation effect and CO2 adsorption effect of the coating prepared according to the process of Example 2 are shown in Table 4.

[0087] Table 4 NOx, CH and CO degradation and CO2 adsorption results of Example 2

[0088]

[0089]

[0090] The tail gas degradation effect and CO2 adsorption effect of the coating prepared according to the process of Comparative Example 1 are shown in Table 5.

[0091] Table 5 Comparative Example 1 for NOx, CH and CO degradation and CO2 adsorption results

[0092]

[0093] The tail gas degradation effect and CO2 adsorption effect of the coating prepared according to the process of Comparative Example 4 are shown in Table 6.

[0094] Table 6 Comparative Example 4 for NOx, CH and CO degradation and CO2 adsorption results

[0095]

[0096]

[0097] The tail gas degradation effect and CO2 adsorption effect of the coating prepared according to the process of Comparative Example 5 are shown in Table 7.

[0098] Table 7 Comparative Example 5 for NOx, CH and CO degradation and CO2 adsorption results

[0099]

[0100]

[0101] Taking into account the impact of different lighting environments on the degradation rate of pollutants and the need to balance exhaust gas treatment and CO2 adsorption, it is more advantageous to choose Example 1 to prepare the coating. However, the degradation rates of NOx, CH, and CO in Example 2 under strong light, weak light, and no light conditions are all higher than those in Example 1 (such as the difference in NOx degradation rate under strong light is 6.1%), but the CO2 adsorption capacity of Example 1 is leading, especially in a weak light environment, the adsorption rate can reach 31.2%, which is significantly improved compared to Comparative Example 1 (21.9%). If guided by the dual goals of exhaust gas purification and carbon neutrality, the advantage of Example 1 in CO2 adsorption can make up for the small gap in its pollutant degradation rate, and its CO2 adsorption performance in a weak light environment does not decrease but increases, which is more suitable for application scenarios with variable lighting (such as urban roads and tunnels). However, if you focus on the degradation of harmful gases in exhaust gas and also want to adsorb some carbon dioxide, you can consider the formula of Example 2. Therefore, in actual application scenarios, you should choose a suitable ratio according to your own goals to provide a sustainable comprehensive solution.

[0102] The results summarized in Comparative Examples 4 and 5 demonstrate that polyethyleneimine is a functional material for carbon dioxide adsorption, while nano-titanium dioxide ensures the degradation of NOx, CH, and CO in exhaust gas. The luminescent properties of the long-afterglow material enable the coating to degrade exhaust pollutants even in the dark. The successful combination of nano-titanium dioxide, the long-afterglow material, and polyethyleneimine is key to ensuring the coating's combined performance of exhaust gas degradation and CO2 adsorption; none of these three elements can be missing.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a road coating having exhaust gas degradation and CO2 adsorption capabilities, characterized in that: The following steps are involved: S1, stirring and mixing anhydrous ethanol and polyethyleneimine, then adding fumed silica and stirring and mixing again, drying, and cooling to finally obtain a CO2 adsorbent; S2, stirring and mixing the epoxy resin and the epoxy resin diluent, then adding the silane coupling agent, stirring and mixing to obtain a mixed solution; S3, adding the CO2 adsorbent in step S1 to the mixed solution in step S2, adding nano titanium dioxide, adding a film-forming aid alcohol ester dodecahydrate and a defoaming agent, stirring, adding an epoxy resin curing agent, and stirring again to obtain a road coating with exhaust gas degradation and CO2 adsorption capabilities.

2. The preparation method according to claim 1, wherein In step S1, the polyethyleneimine is 8 to 10 parts by weight. 、 The amount of anhydrous ethanol is 8 to 10 parts, and the amount of fumed silica is 1 to 1.5 parts.

3. The preparation method according to claim 2, wherein The mass ratio of the anhydrous ethanol, polyethyleneimine and fumed silica is 8: (8-10): (1-1.2).

4. The preparation method according to claim 1, wherein In step S3, nano titanium dioxide and long afterglow material are added simultaneously.

5. The preparation method according to claim 1, wherein In step S1, the specific surface area of ​​the fumed silica is ≥120m 2 / g; the stirring is performed at a speed of 140 to 160 r / min for 13 to 17 minutes; the stirring again is performed at a speed of 80 to 120 r / min for 18 to 22 minutes; and the drying is performed in an oven at 50 to 70°C for 10 to 14 hours.

6. The preparation method according to claim 1, wherein In steps S2 and S3, the epoxy resin is 15 to 20 parts, the epoxy resin diluent is 8 to 10 parts, the silane coupling agent is 5 to 6 parts, the nano-titanium dioxide is 4 to 8 parts, the long afterglow material is 4 to 8 parts, the film-forming aid alcohol ester is 5 to 6 parts, the defoaming agent is 1 to 1.5 parts, and the epoxy resin curing agent is 8 to 10 parts.

7. The preparation method according to claim 6, wherein The mass ratio of the epoxy resin, the epoxy resin diluent and the epoxy resin curing agent is 2:(0.8-1.2):(0.8-1.2).

8. The preparation method according to claim 1, wherein In step S3, the stirring is carried out at a rotation speed of 130 to 170 r / min for 16 to 20 minutes; and the further stirring is carried out at a rotation speed of 90 to 110 r / min for 4 to 6 minutes.

9. A road coating with exhaust gas degradation and CO2 adsorption capabilities, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the road coating with exhaust gas degradation and CO2 adsorption capabilities in asphalt pavement according to claim 9, characterized in that: Apply the coating evenly on the road surface and wait for 6-8 hours to cure.

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