Ultraviolet absorbers, methods for their preparation, and pavement maintenance coatings containing the same

Abstract

This invention provides a UV absorber, its preparation method, and a road surface maintenance coating containing the UV absorber. The UV absorber comprises: emulsified asphalt, wherein the emulsified asphalt includes a stabilizer, and polymer microspheres, wherein the polymer microspheres contain a carrier and an anti-aging agent; wherein the mass ratio of the emulsified asphalt to the polymer microspheres is 1:0.05–2, preferably 1:0.1–1. The UV absorber of this invention can effectively slow down the aging effect of ultraviolet rays in sunlight on asphalt pavements, extending the service life of roads. Furthermore, it enables on-demand and timely spraying, making it economical and convenient. The preparation method of the UV absorber of this invention is simple and easy to implement, the raw materials are readily available, and it is suitable for mass production.

Description

Technical Field

[0001] This invention relates to an ultraviolet absorber, its preparation method, and a road maintenance coating containing the ultraviolet absorber, particularly to an ultraviolet absorber for asphalt pavements in low-latitude and high-radiation areas, its preparation method, and a road maintenance coating containing the ultraviolet absorber. Background Technology

[0002] Due to significant differences in road surface environments, ultraviolet radiation intensity is higher in low-latitude and high-radiation areas. Ultraviolet light can cause further aging of the asphalt surface layer, making the asphalt dry, hard, and brittle. Asphalt pavements are prone to thermal shrinkage cracks, which can then lead to cracking. When rainwater comes in, moisture enters through the cracks and remains in the asphalt surface layer, causing water damage. In severe cases, asphalt can detach from the aggregate surface, resulting in asphalt pavement defects such as cracks, loosening, peeling, and potholes, greatly reducing the road performance and service life of asphalt pavements.

[0003] Asphalt, as an organic polymer material, is prone to aging under heating or natural environmental factors. Currently, both domestically and internationally, anti-aging agents such as AW (Advanced Aging Agent), BLE (Bio-Likely Activated Metal), and UV shielding agents are commonly added to asphalt. Various UV-resistant additives are available on the market, such as bentonite and inorganic nanoparticles. The addition of these additives can effectively slow down the breakage of molecules within the asphalt and reduce oxidation reactions. However, adding UV-resistant additives to asphalt materials before mixing and paving them into asphalt pavement is a technology that can only be used for newly constructed roads; it cannot be used for functional modifications to existing roads.

[0004] Generally, ultraviolet (UV) radiation penetrates asphalt to a depth of approximately 0.1 mm. Considering the inward diffusion of aged asphalt molecules, the impact of UV radiation on asphalt aging occurs at approximately 1 mm of the asphalt surface layer. Due to the voids in asphalt pavements, strong UV radiation can affect the asphalt surface layer to a depth of about 1 cm. Furthermore, the application of UV-resistant asphalt mixtures is geographically limited, primarily in low-latitude and high-radiation areas. Moreover, UV radiation is not continuous, making large-scale paving across the entire area economically unfeasible. Additives can also affect the asphalt material itself, and the road performance of this type of functional pavement still needs further verification.

[0005] Reference 1 discloses a coating material for resisting UV aging of asphalt pavement and its preparation method. The components and contents of the coating material, by weight, are: 2-3 parts nano-cerium dioxide, 70-80 parts epoxy resin, 15-20 parts organic solvent, 0.1-0.2 parts defoamer, and 0.8-0.9 parts dispersant. The method involves first dissolving epoxy resin in a certain amount of organic solvent to obtain a polymer binder, then dispersing nano-cerium dioxide in it, and simultaneously adding a certain amount of dispersant and defoamer while stirring until homogeneous. This coating material for resisting UV aging of asphalt pavement uses a mixture of many chemical reagents before application. Its corrosion resistance to asphalt pavement needs further verification, and its adhesion to the asphalt surface layer is poor. Furthermore, the epoxy resin cannot be repaired by reheating after curing.

[0006] Reference 2 discloses a heat-shielding coating and its preparation method. The raw material components of this heat-shielding coating include: a main film-forming substance, reflective functional materials, color-correcting functional pigments, heat-insulating functional materials, UV-resistant functional materials, diluents, defoamers, leveling agents, curing agents, low-temperature toughening agents, and anti-skid particles. The UV-resistant functional materials used are anatase TiO2, UV absorber UV-1577, UV absorber UV-531, and UV absorber UV-9. Overall, the coating uses too many additives, and the impact of multiple additives on the properties and composition of asphalt needs further verification. Furthermore, it is expensive and economical; coatings without asphalt cannot repair micro-cracks in the road surface, and the preparation process is overly complex.

[0007] References:

[0008] Reference 1: CN102775879A

[0009] Reference 2: CN109593436A Summary of the Invention

[0010] The problem the invention aims to solve

[0011] In view of the technical problems existing in the prior art, the present invention first provides an ultraviolet absorber. The ultraviolet absorber of the present invention can be selectively sprayed on road surfaces that are susceptible to ultraviolet aging according to seasonal and climatic conditions, thereby effectively blocking and slowing down ultraviolet radiation, effectively improving the anti-aging ability of asphalt pavement, and extending the service life of the road.

[0012] Furthermore, the present invention also provides a method for preparing an ultraviolet absorber, which is simple and easy to implement, uses readily available raw materials, and is suitable for mass production.

[0013] Solution for solving the problem

[0014] This invention provides an ultraviolet absorber comprising the following components:

[0015] Emulsified asphalt, the emulsified asphalt comprising a stabilizer, and

[0016] Polymer microspheres, wherein the polymer microspheres comprise a carrier and an anti-aging agent; wherein,

[0017] The mass ratio of the emulsified asphalt to the polymer microspheres is 1:0.05 to 2, preferably 1:0.1 to 1.

[0018] According to the ultraviolet absorber of the present invention, the emulsified asphalt comprises an asphalt matrix, an emulsifier, a stabilizer, and water. Preferably, based on the total mass of the asphalt matrix and water as 100%, the amount of emulsifier added is 0.1-5%, more preferably 0.5-4%; and the amount of stabilizer added is 0.1-3%, more preferably 0.5-3%.

[0019] According to the ultraviolet absorber of the present invention, the mass ratio of the asphalt matrix to water is 0.5 to 2:1, preferably 0.8 to 1.5:1.

[0020] According to the ultraviolet absorber of the present invention, the stabilizer comprises an organic stabilizer, preferably, the organic stabilizer comprises a cellulose compound.

[0021] According to the ultraviolet absorber of the present invention, the emulsifier comprises a nonionic emulsifier;

[0022] Preferably, the nonionic emulsifier includes one or more of the following: polyoxyethylene alkylolamide, alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, fatty amine polyoxyethylene ether, fatty acid polyoxyethylene ester, alkyl alcohol polyoxyethylene ether, block polyoxyethylene-polyoxypropylene ether, propylene glycol polyoxyethylene-polyoxypropylene ether, etc.

[0023] According to the ultraviolet absorber of the present invention, the polymer microspheres comprise a carrier, an anti-aging agent, and water; preferably, the amount of the carrier added is 0.5-5% based on the total mass of water (100%), and the amount of the anti-aging agent added is 5-20%.

[0024] According to the ultraviolet absorber of the present invention, the mass ratio of the carrier to the anti-aging agent is 1:0.5 to 15.

[0025] According to the ultraviolet absorber of the present invention, the carrier comprises one or more of collagen, gelatin, and agar; and / or

[0026] The anti-aging agent includes one or more of the following: sodium phosphate, polytetrafluoroethylene phenyl salicylate, hexamethylphosphoric triamine, and resorcinol monobenzoate.

[0027] The present invention also provides a method for preparing an ultraviolet absorber according to the present invention, which includes the following steps:

[0028] The steps for preparing emulsified asphalt;

[0029] The steps for preparing polymer microspheres;

[0030] The step of mixing the emulsified asphalt and polymer microspheres.

[0031] The present invention also provides a road surface maintenance coating comprising the ultraviolet absorber described in the present invention.

[0032] The effects of the invention

[0033] The ultraviolet absorber of this invention can effectively slow down the aging effect of ultraviolet rays in sunlight on asphalt pavements, extending the service life of roads. Furthermore, it allows for on-demand and timely spraying, making it economical and convenient.

[0034] The preparation method of the ultraviolet absorber of the present invention is simple and easy to implement, the raw materials are readily available, and it is suitable for mass production. Detailed Implementation

[0035] The present invention will now be described in detail. The descriptions of the technical features described below are based on representative embodiments and specific examples of the present invention, but the present invention is not limited to these embodiments and specific examples. It should be noted that:

[0036] In this specification, the range of values ​​referred to as "value A to value B" refers to the range including the endpoint values ​​A and B.

[0037] Unless otherwise stated, in this instruction manual, "more" in "multiple", "multi-variety", "multiple", etc., means a value of 2 or more.

[0038] In this specification, the terms “substantially,” “largely,” or “truly” mean that the error is less than 5%, or less than 3%, or less than 1% compared to the relevant perfect or theoretical standard.

[0039] Unless otherwise specified, "%" in this instruction manual refers to the percentage content by mass.

[0040] In this specification, the word "may" has two meanings: to perform a certain process and not to perform a certain process.

[0041] In this specification, "optional" or "optionally" means that the event or situation described below may or may not occur, and the description includes both the scenario in which the event occurs and the scenario in which the event does not occur.

[0042] In this specification, references to "some specific / preferred embodiments," "other specific / preferred embodiments," "implementation," etc., refer to specific elements (e.g., features, structures, properties, and / or characteristics) related to that embodiment, which are included in at least one of the embodiments described herein and may or may not be present in other embodiments. Furthermore, it should be understood that these elements may be combined in any suitable manner in various embodiments.

[0043] In this instruction manual, the terms "room temperature" and "room temperature" can mean 10 to 40°C.

[0044] First aspect

[0045] This invention first provides an ultraviolet absorber, comprising:

[0046] Emulsified asphalt, the emulsified asphalt comprising a stabilizer, and

[0047] Polymer microspheres, wherein the polymer microspheres comprise a carrier and an anti-aging agent; wherein,

[0048] The mass ratio of the emulsified asphalt to the polymer microspheres is 1:0.05 to 2, preferably 1:0.1 to 1.

[0049] The ultraviolet absorber of this invention can effectively slow down the entry of oxygen and the volatilization of light components in asphalt during ultraviolet light irradiation, thereby slowing down the photo-oxidative aging rate of asphalt surface layers. Furthermore, the ultraviolet absorber of this invention does not require large-scale paving during the construction of new roads; it can be applied to selected road sections before the peak of ultraviolet radiation throughout the year. It is readily available, convenient to use, and economical.

[0050] <Emulsified Asphalt>

[0051] The ultraviolet absorber of the present invention comprises emulsified asphalt. In some specific embodiments, the emulsified asphalt comprises an asphalt matrix, an emulsifier, a stabilizer, and water, wherein, based on the total mass of the asphalt matrix and water as 100%, the amount of emulsifier added is 0.1-5%, preferably 0.5-4%; and the amount of stabilizer added is 0.1-3%, preferably 0.5-3%.

[0052] In some specific embodiments, the mass ratio of the asphalt matrix to water is 0.5 to 2:1, for example: 0.7:1, 0.9:1, 1:1, 1.1:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, etc. When the mass ratio of the asphalt matrix to water is within the range of this application, it is easier to prepare the UV absorber of this application. Preferably, considering stability and ease of spraying, the mass ratio of the asphalt matrix to water in this application can be 0.7 to 1.5:1, more preferably 0.8 to 1.2:1. In this invention, when the amount of asphalt matrix is ​​too high, the particles of the asphalt matrix are very close together, easily causing mutual adhesion and preventing complete emulsification. If the amount of asphalt matrix is ​​too low, the emulsified asphalt cannot effectively utilize the technical properties of the asphalt matrix. When the mass ratio of the asphalt matrix to water is 0.5 to 2:1, especially 0.7 to 1.5:1, the prepared UV absorber is suitable for spraying and has good stability.

[0053] The present invention does not specifically limit the asphalt matrix; it can be any asphalt source material commonly used in the art, such as road petroleum asphalt or modified asphalt.

[0054] Generally, the road petroleum asphalt includes one or more combinations of 70# to 200# road petroleum asphalt. The modified asphalt includes one or more combinations of SBS modified asphalt, rubber asphalt, natural asphalt modified asphalt, and high-viscosity modified asphalt.

[0055] Furthermore, in this invention, based on the total mass of the asphalt matrix and water as 100%, the amount of stabilizer added is 0.1% to 3%, preferably 0.3% to 3%, for example: 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, etc. The inventors of this invention have discovered that when the amount of stabilizer added is 0.1% to 3%, as the amount of stabilizer increases, the amount of residue on the sieve of the prepared emulsified asphalt decreases, indicating a change in the fineness of the emulsified asphalt, complete emulsification of the asphalt matrix, and improved stability after 5 days. However, when the amount of stabilizer reaches a certain level, the increase in stability is limited, and excessive use of stabilizer increases costs. Therefore, in this invention, the amount of stabilizer added is 0.1% to 3%.

[0056] Furthermore, the stabilizer of the present invention includes an organic stabilizer. By using an organic stabilizer, the effects of the ultraviolet absorber of the present invention on salt resistance, acid resistance, calcium resistance, high temperature resistance, weather resistance, and resistance to ultraviolet radiation and aging can be improved. Preferably, the organic stabilizer includes a cellulose compound.

[0057] The cellulose compounds of this invention can be polyanionic cellulose (PAC). Polyanionic cellulose has a higher degree of substitution and uniformity of substitution, shorter molecular chains, and a more stable molecular structure, thus exhibiting better resistance to salt, acid, calcium, and high temperatures, as well as enhanced solubility. By using polyanionic cellulose, this invention allows the two-phase system of polymer microspheres and emulsified asphalt to exist stably. Furthermore, it enables the ultraviolet absorber of this invention to possess excellent weather resistance, UV resistance, radiation resistance, and aging resistance.

[0058] Furthermore, in this invention, based on the total mass of the asphalt matrix and water as 100%, the amount of emulsifier added is 0.1% to 5%, preferably 0.5% to 4%; for example: 0.2%, 0.8%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, etc. In this invention, as the amount of emulsifier increases, the amount of residue on the sieve of the prepared emulsified asphalt decreases, indicating that the fineness of the emulsified asphalt improves, the asphalt matrix is ​​completely emulsified, and the stability improves. However, when the amount of emulsifier reaches a certain level, the increase in stability is limited, and excessive use of emulsifier increases costs; but too little emulsifier cannot obtain the desired emulsified asphalt. Therefore, in this invention, the amount of emulsifier added can be 0.1% to 5%.

[0059] Furthermore, in this invention, the emulsifier includes a nonionic emulsifier. Compared to cationic and anionic emulsifiers, the nonionic emulsifier used in this invention has better adaptability to anti-aging agents in polymer microspheres. Nonionic surfactants have a wider pH range and do not exist in an ionic state in solution, therefore they have high stability and are less affected by the presence of strong electrolytes.

[0060] Furthermore, the present invention does not specifically limit the nonionic emulsifier, and it can be some nonionic emulsifiers commonly used in the art. Specifically, the nonionic emulsifier can be one or a combination of two or more of the following: polyoxyethylene alkylolamides (e.g., lauroyl diethanolamine, fatty acyl diethanolamine, etc.), alkylphenol polyoxyethylene ethers, fatty alcohol polyoxyethylene ethers, fatty amine polyoxyethylene ethers, fatty acid polyoxyethylene esters, alkyl alcohol polyoxyethylene ethers, block polyoxyethylene-polyoxypropylene ethers, propylene glycol polyoxyethylene-polyoxypropylene ethers, etc.

[0061] <Polymer Microspheres>

[0062] Asphalt and water are immiscible liquids. If asphalt is sheared into fine particles and uniformly dispersed in water through strong mechanical shearing, an asphalt emulsion is formed. Emulsified asphalt is an unstable two-phase system. To maintain the storage stability of emulsified asphalt, the free energy at the asphalt-water interface must be reduced to achieve thermodynamic equilibrium and comply with the principle of minimum energy. Adding a large amount of electrolyte to emulsified asphalt will accelerate the demulsification rate.

[0063] Emulsified asphalt has a thermodynamically unstable structure, either oil-in-water or water-in-oil. This invention enables the dispersion of anti-aging agents on a carrier of polymer microspheres. Mixing the polymer microspheres with emulsified asphalt allows the preparation of a UV absorber that integrates anti-UV aging and maintenance properties.

[0064] In some specific embodiments, the polymer microspheres comprise a carrier, an anti-aging agent, and water. This invention involves adding the anti-aging agent to the carrier solution, allowing the anti-aging agent to adsorb onto the carrier at a microscale. Preferably, based on 100% of the total water mass, the amount of carrier added is 0.5% to 5%, for example: 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, etc.; the amount of anti-aging agent added is 5% to 20%, for example: 7%, 9%, 11%, 13%, 15%, 17%, 19%, etc. When the contents of the carrier and anti-aging agent are within the ranges specified in this application, it is advantageous to prepare polymer microspheres, and the resulting ultraviolet absorber exhibits excellent performance.

[0065] This invention involves attaching an anti-aging agent to a carrier to obtain polymer microspheres, which are then mixed with emulsified asphalt. The polymer microspheres prevent the anti-aging agent from directly reacting with the emulsified asphalt, allowing the polymer microspheres and emulsified asphalt to exist stably in a two-phase configuration after mixing.

[0066] Furthermore, in this invention, the mass ratio of the carrier to the anti-aging agent is 1:0.5 to 15, for example: 1:1.5, 1:2, 1:4, 1:6, 1:8, 1:10, 1:12, 1:14, etc.; when the mass ratio of the carrier to the anti-aging agent is 1:0.5 to 15, a UV absorber with superior performance can be obtained.

[0067] The present invention does not impose a particular limitation on the specific composition of the carrier, which can be some carriers commonly used in the art. Specifically, the carrier includes one or more of collagen, gelatin, and agar.

[0068] Furthermore, the specific composition of the anti-aging agent in this invention is not particularly limited, and it can be some anti-aging agents commonly used in the art. Specifically, the anti-aging agent of this invention can be one or a combination of two or more of sodium phosphate, polytetrafluoroethylene phenyl salicylate, hexamethylphosphoric triamine, resorcinol monobenzoate, etc., with sodium phosphate being preferred. Further, sodium phosphate has excellent acid and alkali resistance, high temperature resistance, and is an anti-aging agent with good ultraviolet shielding effectiveness.

[0069] Second aspect

[0070] A second aspect of the present invention provides a method for preparing an ultraviolet absorber according to the present invention, comprising the following steps:

[0071] The steps for preparing emulsified asphalt;

[0072] The steps for preparing polymer microspheres;

[0073] The step of mixing the emulsified asphalt and polymer microspheres.

[0074] <Steps for preparing emulsified asphalt>

[0075] The steps for preparing emulsified asphalt according to the present invention may include:

[0076] A soap solution is prepared by dissolving stabilizers and emulsifiers in water.

[0077] The soap solution is added to a colloid mill and sheared and stirred to emulsify it, thus obtaining emulsified asphalt.

[0078] In some specific embodiments, the steps for preparing emulsified asphalt according to the present invention may include the following steps:

[0079] 1. Weigh out a certain amount of water according to the ratio, heat it, then add a stabilizer, allowing the stabilizer to swell and then dissolve. Then add an emulsifier and stir evenly to prepare soap solution.

[0080] 2. Continuously circulate water within the colloid mill to preheat the emulsifier. The purpose of adding water is to bring the colloid mill to a certain temperature. The colloid mill itself does not have a heating function; preparing the emulsion at a specific temperature will achieve better results because emulsified asphalt is a highly unstable system, easily affected by temperature and environment, and prone to demulsification. Add the soap solution from step 1 to the colloid mill for shearing and stirring to ensure the shearing effect of the emulsifier and various additives. Then, slowly add the asphalt matrix and soap solution to the colloid mill for shearing and stirring, thus initiating emulsification.

[0081] 3. Open the valve of the colloid mill to let the prepared emulsified asphalt flow out, seal it with plastic wrap and defoam.

[0082] In some specific implementations, in step 1, the heating temperature is 70-90°C. When the heating temperature is 70-90°C, it is beneficial for the dissolution of the stabilizer.

[0083] In some specific implementations, in step 2, the water temperature is 60–80°C, and the soap solution is sheared and stirred for 20–40 seconds. Additionally, to avoid a grainy texture in the asphalt matrix, the emulsification time is 1–5 minutes, and the emulsification temperature is 120–160°C.

[0084] In some specific implementations, in step 3, the defoaming temperature is 40-70°C, and the defoaming time is 0.1-1 hour.

[0085] <Steps for preparing polymer microspheres>

[0086] The steps for preparing polymer microspheres according to the present invention may include: dissolving a carrier and an anti-aging agent in water to obtain a polymer microsphere emulsion.

[0087] In some specific implementations, the preparation method includes the following steps: dissolving the carrier in water, adding an anti-aging agent, mixing evenly, and obtaining a polymer microsphere emulsion. Specifically, the mixture can be mixed evenly at room temperature.

[0088] <Mix>

[0089] After the emulsified asphalt and polymer microsphere emulsion are mixed evenly, an ultraviolet absorber is obtained. Specifically, the mixture can be stirred evenly at room temperature.

[0090] Third aspect

[0091] A third aspect of the present invention provides a road surface maintenance coating comprising the ultraviolet absorber of the first aspect of the present invention.

[0092] The road surface maintenance coating of this invention can effectively slow down the entry of oxygen and the volatilization of light components in asphalt under ultraviolet light irradiation, thereby slowing down the photo-oxidative aging rate of the asphalt surface layer. It does not require large-scale paving during new road construction; instead, it can be sprayed onto the road surface on selected sections before the peak of ultraviolet radiation throughout the year. It is convenient to use and economical.

[0093] Example

[0094] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0095] Polyanionic cellulose (PAC), manufacturer: Hebei Yanxing Chemical Co., Ltd.

[0096] Asphalt matrix: Grade 90 road petroleum asphalt (A grade).

[0097] Sodium phosphate salt, manufacturer: Xi'an Haotian Bioengineering Co., Ltd.

[0098] Example 1

[0099] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0100] (1) Heat the weighed water to 80°C. Based on the total mass of asphalt matrix and water as 100%, add 0.8% polyanionic cellulose (PAC) and stir continuously to make it swell first and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0101] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt matrix, heated to a constant temperature of 140°C, and shear-stir together with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0102] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0103] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar was dissolved in water, and then 15% sodium phosphate salt was added. The mixture was stirred and mixed evenly at room temperature to prepare polymer microsphere emulsion.

[0104] 3. The ultraviolet absorber is prepared by mixing and stirring emulsified asphalt and polymer microsphere emulsion at a mass ratio of 1:0.6 at room temperature.

[0105] Example 2

[0106] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0107] (1) Heat the weighed water to 80°C. Based on the total mass of asphalt matrix and water as 100%, add 0.4% polyanionic cellulose (PAC) and stir continuously to make it swell first and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0108] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt matrix, heated to a constant temperature of 140°C, and shear-stir together with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0109] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0110] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar was dissolved in water, and then 15% sodium phosphate salt was added. The mixture was stirred and mixed evenly at room temperature to prepare polymer microsphere emulsion.

[0111] 3. Mixing: Emulsified asphalt and polymer microsphere emulsion are mixed and stirred evenly at room temperature at a mass ratio of 1:0.6 to prepare ultraviolet absorber.

[0112] Example 3

[0113] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0114] (1) Heat the weighed water to 80°C. Based on the total mass of asphalt matrix and water as 100%, add 0.8% polyanionic cellulose (PAC) and stir continuously to make it swell first and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0115] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt, heated to a constant temperature of 140°C, and shear-stir with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0116] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0117] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar was dissolved in water, and then 10% sodium phosphate salt was added. The mixture was stirred and mixed evenly at room temperature to prepare polymer microsphere emulsion.

[0118] 3. Mixing: Emulsified asphalt and polymer microsphere emulsion are mixed and stirred evenly at room temperature at a mass ratio of 1:0.6 to prepare ultraviolet absorber.

[0119] Example 4

[0120] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.0%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0121] (1) Heat the weighed water to 80°C, add 0.8% polyanionic cellulose (PAC) and stir continuously to make it swell and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0122] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt matrix, heated to a constant temperature of 140°C, and shear-stir together with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0123] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0124] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar was dissolved in water, and then 15% sodium phosphate salt was added. The mixture was stirred and mixed evenly at room temperature to prepare polymer microsphere emulsion.

[0125] 3. Mixing: Emulsified asphalt and polymer microsphere emulsion are mixed and stirred evenly at room temperature at a mass ratio of 1:0.6 to prepare ultraviolet absorber.

[0126] Example 5

[0127] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0128] (1) Heat the weighed water to 80°C. Based on the total mass of asphalt matrix and water as 100%, add 0.8% polyanionic cellulose (PAC) and stir continuously to make it swell first and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0129] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt matrix, heated to a constant temperature of 140°C, and shear-stir together with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0130] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0131] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar was dissolved in water, and then 15% sodium phosphate salt was added. The mixture was stirred and mixed evenly at room temperature to prepare polymer microsphere emulsion.

[0132] 3. Emulsified asphalt and polymer microsphere emulsion were mixed and stirred evenly at room temperature at a mass ratio of 1:0.2 to prepare ultraviolet absorber.

[0133] Example 6

[0134] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0135] (1) Heat the weighed water to 80°C. Based on the total mass of asphalt matrix and water as 100%, add 0.8% polyanionic cellulose (PAC) and stir continuously to make it swell first and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0136] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt matrix, heated to a constant temperature of 140°C, and shear-stir together with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0137] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0138] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar was dissolved in water, and then 15% sodium phosphate salt was added. The mixture was stirred and mixed evenly at room temperature to prepare polymer microsphere emulsion.

[0139] 3. The ultraviolet absorber is prepared by mixing and stirring emulsified asphalt and polymer microsphere emulsion at a mass ratio of 1:0.8 at room temperature.

[0140] Comparative Example 1

[0141] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0142] (1) Heat the weighed water to 80°C. Based on the total mass of asphalt matrix and water as 100%, add 0.8% polyanionic cellulose (PAC) and stir continuously to make it swell first and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0143] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt, heated to a constant temperature of 140°C, and shear-stir with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0144] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0145] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar is dissolved in water and mixed and stirred at room temperature to obtain a polymer microsphere emulsion.

[0146] 3. Mixing: Emulsified asphalt and polymer microsphere emulsion are mixed and stirred evenly at room temperature at a mass ratio of 1:0.6 to prepare ultraviolet absorber.

[0147] Comparative Example 2

[0148] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0149] (1) Heat the weighed water to 80°C, add the non-ionic emulsifier lauroyl diethanolamine according to the amount, and stir evenly to make soap solution.

[0150] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt matrix, heated to a constant temperature of 140°C, and shear-stir together with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0151] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0152] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar was dissolved in water, and then 15% sodium phosphate salt was added. The mixture was stirred and mixed evenly at room temperature to prepare polymer microsphere emulsion.

[0153] 3. Mixing: Emulsified asphalt and polymer microsphere emulsion are mixed and stirred at room temperature at a mass ratio of 1:0.6 to obtain ultraviolet absorber.

[0154] Comparative Example 3

[0155] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0156] (1) Heat the weighed water to 80°C. Based on the total mass of asphalt matrix and water as 100%, add 0.8% polyanionic cellulose (PAC) and stir continuously to make it swell first and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0157] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt, heated to a constant temperature of 140°C, and shear-stir with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0158] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0159] 2. Preparation of anti-UV aging solution: Based on the total mass of water as 100%, add 15% sodium phosphate salt, mix and stir at room temperature until homogeneous to prepare sodium phosphate salt solution.

[0160] 3. Mixing: Emulsified asphalt and polymer microsphere emulsion are mixed and stirred evenly at room temperature at a mass ratio of 1:0.6 to prepare ultraviolet absorber.

[0161] Comparative Example 4

[0162] 1. Preparation of emulsified asphalt: Based on the total mass of asphalt matrix and water as 100%, the amount of nonionic emulsifier lauroyl diethanolamine is 1.8%, wherein the mass ratio of asphalt matrix to water is 1:1.

[0163] (1) Heat the weighed water to 80°C. Based on the total mass of asphalt matrix and water as 100%, add 0.8% polyanionic cellulose (PAC) and stir continuously to make it swell first and then dissolve. Add the nonionic emulsifier lauroyl diethanolamine according to the amount and stir evenly to make soap solution.

[0164] (2) Preheat the emulsifier by continuously circulating water at approximately 70°C within the colloid mill. After thorough preheating, drain the hot water. Add the soap solution to the colloid mill and shear-stir for approximately 30 seconds to ensure the shearing effect of the emulsifier and various additives. Slowly add the asphalt matrix, heated to a constant temperature of 140°C, and shear-stir together with the soap solution in the colloid mill. To avoid a grainy texture in the asphalt, the emulsification time is approximately 3 minutes.

[0165] (3) Open the valve to let out the prepared emulsified asphalt, seal it with plastic wrap, and put it in a 60℃ oven for half an hour to defoam.

[0166] 2. Preparation of polymer microspheres: Based on the total mass of water as 100%, 2% agar was dissolved in water, and then 15% sodium phosphate salt was added. The mixture was stirred and mixed evenly at room temperature to prepare polymer microsphere emulsion.

[0167] 3. Mix emulsified asphalt and polymer microsphere emulsion at a mass ratio of 1:3 at room temperature to prepare an ultraviolet absorber.

[0168] Performance testing

[0169] This invention patent uses zeta potential value to evaluate the stability of UV-resistant emulsified asphalt concentrate and uses UV aging test to evaluate its resistance to UV aging.

[0170] Zeta potential test: The value of zeta potential is well correlated with the stability of emulsified asphalt. The higher the zeta potential, the more stable the system; the lower the zeta potential, the easier it is for particles in the emulsion to aggregate, disperse, break down, and demulsify. The test method is to immerse the detection sensor of the zeta potential meter into the asphalt emulsion for measurement.

[0171] UV aging test: The emulsified asphalt coating was subjected to an accelerated thermo-oxidative UV aging test using a fluorescent UV aging apparatus. 50g ± 1g of each UV-resistant emulsified asphalt was poured into a flat-bottomed disc (Φ140mm × 9.5mm). The sample was irradiated with a 500W straight-tube high-pressure mercury UV lamp, with the lamp 45cm away from the sample. The internal temperature of the UV lamp chamber was controlled at 85℃. The samples were aged for 72 hours, and the changes in the asphalt's properties after aging were tested.

[0172] Table 1

[0173]

[0174] As can be seen from Table 1, the softening point of the ultraviolet absorbers in Examples 1-6 of the present invention decreased to a certain extent after aging, indicating that the ultraviolet absorbers of the present invention can resist ultraviolet aging well and have excellent stability.

[0175] Comparative Example 1 did not contain any anti-aging agents, yet its softening point increased excessively after aging, indicating that the product in Comparative Example 1 could not resist UV aging.

[0176] No stabilizer was added in Comparative Example 2, and no carrier was added in Comparative Example 3. Both Comparative Example 2 and Comparative Example 3 showed poor stability.

[0177] In Comparative Example 4, the mass ratio of emulsified asphalt to polymer microsphere emulsion was outside the range of this application, resulting in demulsification, and the UV absorber product could not be applied.

[0178] It should be noted that although the technical solution of the present invention has been described with specific examples, those skilled in the art will understand that the present invention should not be limited thereto.

[0179] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An ultraviolet absorber, characterized in that, It includes the following components: Emulsified asphalt, the emulsified asphalt comprising a stabilizer, the stabilizer comprising an organic stabilizer, and... Polymer microspheres, comprising a carrier, an anti-aging agent, and water; the carrier is added at 0.5-5% of the total water mass; the anti-aging agent is added at 5-20%; the carrier is agar; the anti-aging agent is sodium phosphate salt; wherein, The mass ratio of the emulsified asphalt to the polymer microspheres is 1:0.05~2; The method for preparing the ultraviolet absorber includes the following steps: The steps for preparing emulsified asphalt; After dissolving the carrier in water, an anti-aging agent was added, and the mixture was stirred at 10~40℃ to obtain a polymer microsphere emulsion. The emulsified asphalt and polymer microspheres are mixed at 10~40℃ to obtain an ultraviolet absorber.

2. The ultraviolet absorber according to claim 1, characterized in that, The mass ratio of the emulsified asphalt to the polymer microspheres is 1:0.1~1.

3. The ultraviolet absorber according to claim 1 or 2, characterized in that, The emulsified asphalt includes an asphalt matrix, an emulsifier, a stabilizer, and water.

4. The ultraviolet absorber according to claim 3, characterized in that, Based on the total mass of the asphalt matrix and water as 100%, the amount of emulsifier added is 0.1~5%; the amount of stabilizer added is 0.1~3%.

5. The ultraviolet absorber according to claim 4, characterized in that, Based on the total mass of the asphalt matrix and water as 100%, the amount of emulsifier added is 0.5-4%; the amount of stabilizer added is 0.5-3%.

6. The ultraviolet absorber according to claim 3, characterized in that, The mass ratio of the asphalt matrix to water is 0.5 to 2:

1.

7. The ultraviolet absorber according to claim 6, characterized in that, The mass ratio of the asphalt matrix to water is 0.7~1.5:

1.

8. The ultraviolet absorber according to claim 1 or 2, characterized in that, The organic stabilizer contains cellulose compounds.

9. The ultraviolet absorber according to claim 3, characterized in that, The emulsifier includes a nonionic emulsifier.

10. The ultraviolet absorber according to claim 1 or 2, characterized in that, The mass ratio of the carrier to the anti-aging agent is 1:0.5~15.

11. A method for preparing an ultraviolet absorber according to any one of claims 1-10, characterized in that, Includes the following steps: The steps for preparing emulsified asphalt; The steps for preparing polymer microspheres are as follows: after dissolving the carrier in water, an anti-aging agent is added, and the mixture is stirred at 10~40℃ to obtain a polymer microsphere emulsion. The emulsified asphalt and polymer microspheres are mixed at 10~40℃ to obtain an ultraviolet absorber.

12. A road surface maintenance coating, characterized in that, Includes the ultraviolet absorber according to any one of claims 1-10.

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