Anti-ultraviolet aging asphalt and preparation method thereof

Abstract

The invention relates to the technical field of road building materials, in particular to anti-ultraviolet aging asphalt and a preparation method thereof.The anti-ultraviolet aging asphalt is prepared from matrix asphalt, composite modified rubber, reinforcing filler, antioxidant and stearamide, the preparation method comprises the steps that A, after the matrix asphalt is heated and stirred to be uniform, the stearamide is added, stirring continues to be conducted, and pretreated asphalt is obtained; step B, adding composite modified rubber into the pretreated asphalt, adjusting the temperature to 170-190 DEG C, performing high-speed shearing, adding a reinforcing filler, keeping the temperature to 160-170 DEG C, performing high-speed shearing, cooling to 140-150 DEG C, adding an antioxidant, and uniformly stirring to obtain an asphalt intermediate; step C, performing constant-temperature curing on the asphalt intermediate, and naturally cooling to normal temperature to obtain the anti-ultraviolet aging asphalt. The prepared anti-ultraviolet aging asphalt has excellent anti-ultraviolet aging capability, so that the performance degradation caused by environmental factors can be reduced, and the flatness and comfort of a road are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of road construction materials, in particular to an ultraviolet aging resistant asphalt and a preparation method thereof. BACKGROUND

[0002] As the most commonly used cementing material in road engineering, the performance of asphalt is significantly affected by the natural environment. Under the action of long-term ultraviolet radiation, the molecular chain of asphalt is broken and the oxidation reaction is intensified, resulting in hardening and embrittlement of the asphalt, and cracks and peeling of the pavement, which seriously shortens the service life. The existing technology mainly improves the ultraviolet aging resistance of asphalt by adding hindered amine light stabilizers, nanomaterials and polymers. However, the interface bonding between nanomaterials, inorganic powders and asphalt is weak, and the phenomenon of delamination easily occurs. Moreover, the anti-aging effect is limited due to the dependence on a single mechanism of ultraviolet absorption or free radical scavenging, and some small molecule light stabilizers are prone to volatilize at high temperatures, resulting in the attenuation of long-term ultraviolet aging resistance. In view of the above problems, the application provides an ultraviolet aging resistant asphalt and a preparation method thereof, which solves the problems of poor compatibility and low efficiency of single mechanism in the prior art, and provides a long-acting anti-aging solution for asphalt pavement in high-altitude and strong ultraviolet regions. SUMMARY

[0003] In order to solve the technical problems mentioned in the background, the application provides an ultraviolet aging resistant asphalt and a preparation method thereof.

[0004] The application provides an ultraviolet aging resistant asphalt, which adopts the following technical scheme: An ultraviolet aging resistant asphalt comprises the following raw materials by weight: 100-120 parts of base asphalt, 5-15 parts of composite modified rubber, 2-5 parts of reinforcing filler, 0.5-1 part of antioxidant, and 0.1-0.5 part of stearic amide.

[0005] Preferably, the base asphalt is 70# and / or 90# road petroleum asphalt.

[0006] Preferably, the preparation step of the composite modified rubber is as follows: Step 1: waste tire rubber, styrene-butadiene rubber and chloroprene rubber are respectively crushed and sieved, and then mixed to obtain mixed rubber powder; the mixed rubber powder is added into a microwave reaction kettle, and under the protection of nitrogen, benzophenone and zinc stearate are added, and after microwave high-temperature treatment, devulcanized rubber is obtained; Step 2: the devulcanized rubber is added into toluene, stirred at a temperature of 50-60 DEG C for 20-30 min, maleic anhydride, silane coupling agent and initiator are added, the temperature is raised to 70-80 DEG C, and under the protection of nitrogen, the reaction is carried out for 1-2 h; toluene is removed by reduced pressure distillation, and after drying, grafted rubber is obtained; Step 3, grafting rubber, dicumyl peroxide and light stabilizer, at 100-120℃, high speed stirring uniform after, get compound modified rubber.

[0007] Preferably, the mass ratio of waste tire rubber, styrene butadiene rubber and chlorobutyl rubber in step 1 is 8-10:3-5:1-3.

[0008] Preferably, the microwave power in the microwave high temperature treatment in step 1 is 600-700W, the temperature is 160-180℃, and the treatment time is 25-35min.

[0009] Preferably, the amount of benzophenone in step 1 is 2-4% of the mass of the mixed rubber powder. Preferably, the amount of zinc stearate in step 1 is 1-2% of the mass of the mixed rubber powder.

[0010] Preferably, the amount of desulfurized rubber, toluene, maleic anhydride, silane coupling agent and initiator in step 2 is 60-80:80-100:4-6:1-3:0.5-1.

[0011] Preferably, the amount of grafting rubber, dicumyl peroxide and light stabilizer in step 3 is 100-120:1-2:3-8.

[0012] Preferably, the light stabilizer in step 3 is composed of hindered amine light stabilizer, benzotriazole ultraviolet absorber and cardanol with a mass ratio of 5-8:2-3:1-2.

[0013] Preferably, the hindered amine light stabilizer is one or more of light stabilizer 622, light stabilizer 944, light stabilizer 144.

[0014] Preferably, the benzotriazole ultraviolet absorber is one or more of light stabilizer UV-P, light stabilizer 234, light stabilizer 326, light stabilizer 328.

[0015] Preferably, the preparation method of the reinforcing filler is: graphene and nano zinc oxide are added to anhydrous ethanol, stirred uniformly, then vinyl trimethoxysilane and dodecyl succinic anhydride are added, and the reinforcing filler is obtained after high-speed shearing and drying.

[0016] Preferably, the mass ratio of graphene, nano zinc oxide, anhydrous ethanol, vinyl trimethoxysilane and dodecyl succinic anhydride is 10-30:10-20:120-180:0.5-1:0.3-0.8.

[0017] Preferably, the antioxidant is one or more of 2,6-di-tert-butyl-p-cresol, antioxidant 1010, antioxidant 1076.

[0018] The application also provides a preparation method of the anti-ultraviolet aging asphalt. The preparation method of the anti-ultraviolet aging asphalt comprises the following preparation steps: Step A, heating the base asphalt to 160-180℃, after uniform stirring, adding stearic amide, continuing to stir, obtaining a pretreated asphalt; Step B, adding the composite modified rubber to the pretreated asphalt, adjusting the temperature to 170-190℃, high-speed shearing for 30-45min, adding the reinforcing filler, maintaining the temperature at 160-170℃, high-speed shearing for 20-30min, cooling to 140-150℃, adding the antioxidant, stirring for 15-20min, obtaining an asphalt intermediate: Step C, after constant temperature curing of the asphalt intermediate, naturally cooling to room temperature, obtaining the anti-ultraviolet aging asphalt.

[0019] Preferably, the constant temperature curing temperature in Step C is 130-140℃, and the constant temperature curing time is 40-60min.

[0020] In summary, the application has the following beneficial effects: In the application, the mixed rubber powder is subjected to a series of modification treatments such as devulcanization and grafting. The microwave devulcanization can break the crosslinking structure of the rubber molecules, so that the rubber is more easily combined with other substances. After the grafting modification, the polarity of the rubber molecular chain is enhanced, and the compatibility with the base asphalt is greatly improved. In the high-speed shearing process, the modified rubber can be uniformly dispersed in the asphalt to form a stable network structure. The light stabilizer contains cardanol, and the phenolic hydroxyl structure can form a synergistic effect with the light stabilizer 622 and the light stabilizer UV-P. The aromatic ring structure of cardanol can absorb ultraviolet light and convert it into heat energy, and at the same time, it can also capture free radicals, delay the consumption of the antioxidant 1010, and significantly enhance the anti-deformation ability and anti-ultraviolet aging stability of the asphalt. The nanofiller is treated with vinyltrimethoxysilane and dodecenyl succinic anhydride. The alkoxy group of the vinyltrimethoxysilane can react with the hydroxyl group on the surface of the graphene and nano zinc oxide to form a covalent bond, and the vinyl group can form a π-π interaction with the aromatic ring in the asphalt, effectively improving the interfacial compatibility of the filler and the asphalt matrix, and enhancing the mechanical properties and anti-aging stability of the system. The dodecenyl succinic anhydride can form a coordination bond with the surface of the nano zinc oxide, and the long-chain alkyl group can be mutually soluble with the asphalt oil, forming a steric hindrance effect. It cooperates with the vinyltrimethoxysilane to further reduce the agglomeration of the filler. DETAILED DESCRIPTION

[0021] The application will be further described in detail below in combination with the examples.

[0022] The waste tire rubber used in the examples and comparative examples of the present application was purchased from Hebei Hukang Mining Products Co., Ltd.; the styrene-butadiene rubber (brand: 796) was purchased from Foshan Ruisheng Plastic Co., Ltd.; the chloroprene rubber was purchased from Hengshui Hongyun Special Regenerated Rubber Co., Ltd.; the light stabilizer 622 was purchased from Wuhan Huaxiang Kejebio Technology Co., Ltd.; the light stabilizer UV-P was purchased from Dongguan Canhui New Material Technology Co., Ltd.; the cardanol was purchased from Hubei Xingyan New Material Technology Co., Ltd.; the graphene (400 mesh) was purchased from Qingdao Tianfeng Graphite Co., Ltd.; the nano zinc oxide was purchased from Shandong Xuchun Chemical Technology Co., Ltd.; the vinyltrimethoxysilane was purchased from Wuhan Jixingyibang Biological Technology Co., Ltd.; the dodecenyl succinic anhydride was purchased from Shanghai Hongzhuang Chemical Technology Co., Ltd.; the antioxidant 1010 was purchased from Dongguan Xingyuan Chemical Co., Ltd.

[0023] Examples 1-3 provide an anti-ultraviolet aging asphalt and a preparation method thereof.

[0024] Example 1 An anti-ultraviolet aging asphalt, comprising the following raw materials by weight: 100 parts of 70# road petroleum asphalt, 5 parts of composite modified rubber, 2 parts of reinforcing filler, 0.5 parts of antioxidant, and 0.1 parts of stearic amide, wherein the antioxidant is antioxidant 1010.

[0025] The preparation steps of the composite modified rubber are as follows: Step 1, the waste tire rubber, styrene-butadiene rubber and chloroprene rubber are respectively crushed through an 80-mesh sieve, then mixed according to a mass ratio of 8:3:1 to obtain mixed rubber powder, and the mixed rubber powder is added into a microwave reaction kettle, benzophenone and zinc stearate are added under nitrogen protection, and the mixed rubber powder, benzophenone and zinc stearate are subjected to microwave high-temperature treatment at a microwave power of 600 W and a temperature of 160℃ for 25 min, to obtain devulcanized rubber, and the mass ratio of the mixed rubber powder, benzophenone and zinc stearate is 100:2:1; Step 2, the devulcanized rubber is added into toluene, stirred at a stirring speed of 500 rpm at a temperature of 50℃ for 20 min, maleic anhydride, KH-560 and benzoyl peroxide are added, the temperature is raised to 70℃, and the mixture is reacted under nitrogen protection for 2 h, then toluene is removed by reduced pressure distillation, and the grafted rubber is obtained after drying, wherein the amount ratio of the devulcanized rubber, toluene, maleic anhydride, silane coupling agent and benzoyl peroxide is 60:80:4:1:0.5; Step 3, the grafted rubber, dicumyl peroxide and light stabilizer are uniformly stirred at a speed of 1000 rpm at 100℃ to obtain the composite modified rubber, wherein the amount ratio of the grafted rubber, dicumyl peroxide and light stabilizer is 100:1:3, and the light stabilizer is composed of light stabilizer 622, light stabilizer UV-P and cardanol according to a mass ratio of 5:2:1.

[0026] The preparation method of the reinforcing filler is as follows: graphene and nano zinc oxide are added into anhydrous ethanol, uniformly stirred at a rotation speed of 500 rpm, then vinyltrimethoxysilane and dodecenyl succinic anhydride are added, high-speed shearing is conducted at a rotation speed of 2000 rpm for 10 min, drying is conducted at 60℃ for 10 h, and the reinforcing filler is obtained, and the mass ratio of graphene, nano zinc oxide, anhydrous ethanol, vinyltrimethoxysilane and dodecenyl succinic anhydride is 10:10:120:0.5:0.3.

[0027] A preparation method of an anti-ultraviolet aging asphalt comprises the following preparation steps: Step A, the base asphalt is heated to 160℃, uniformly stirred at a rotation speed of 200 rpm, then stearic amide is added, and stirring is continued for 20 min to obtain pretreated asphalt; Step B, the pretreated asphalt is added with composite modified rubber, the temperature is adjusted to 170℃, high-speed shearing is conducted at a rotation speed of 2000 rpm for 30 min, the reinforcing filler is added, the temperature is kept at 160℃, high-speed shearing is conducted for 20 min, the temperature is reduced to 140℃, the antioxidant is added, and stirring is conducted at a rotation speed of 400 rpm for 15 min to obtain an asphalt intermediate; Step C, the asphalt intermediate is cured at 130℃ for 40 min, and then naturally cooled to room temperature to obtain the anti-ultraviolet aging asphalt.

[0028] Example 2 An anti-ultraviolet aging asphalt comprises the following raw materials in parts by weight: 70# road petroleum asphalt 110 parts, composite modified rubber 10 parts, reinforcing filler 4 parts, antioxidant 0.8 parts, and stearic amide 0.3 parts, wherein the antioxidant is antioxidant 1010.

[0029] The preparation steps of the composite modified rubber are as follows: Step 1, waste tire rubber, styrene-butadiene rubber and chloroprene rubber are respectively crushed through a 100-mesh sieve, mixed according to a mass ratio of 9:4:2 to obtain mixed rubber powder, the mixed rubber powder is added into a microwave reaction kettle, diphenyl ketone and zinc stearate are added under nitrogen protection, and then high-temperature treatment is conducted by microwave to obtain devulcanized rubber, and the mass ratio of the mixed rubber powder, diphenyl ketone and zinc stearate is 100:3:1.5, the microwave power is 650 W, the temperature is 170℃, and the treatment time is 30 min; Step 2, the devulcanized rubber is added into toluene, stirred at a stirring speed of 700 rpm at a temperature of 55℃ for 25 min, maleic anhydride, KH-560 and benzoyl peroxide are added, the temperature is increased to 75℃, reaction is conducted under nitrogen protection for 1.5 h, toluene is removed by reduced pressure distillation, and then drying is conducted to obtain grafted rubber, and the amount ratio of the devulcanized rubber, toluene, maleic anhydride, silane coupling agent and benzoyl peroxide is 70:90:5:2:0.8; Step 3, the grafted rubber, dicumyl peroxide and light stabilizer are uniformly stirred at 110℃ and 1100rpm to obtain the modified rubber, wherein the amount ratio of the grafted rubber, dicumyl peroxide and light stabilizer is 110:1.5:5, and the light stabilizer is composed of light stabilizer 622, light stabilizer UV-P and cardanol with a mass ratio of 6:2.5:1.5.

[0030] The preparation method of the reinforcing filler is as follows: graphene and nano zinc oxide are added into anhydrous ethanol, uniformly stirred at 800rpm, and then vinyltrimethoxysilane and dodecenyl succinic anhydride are added, and the mixture is subjected to high-speed shearing at 2500rpm for 15min and dried at 70℃ for 11h to obtain the reinforcing filler, wherein the mass ratio of graphene, nano zinc oxide, anhydrous ethanol, vinyltrimethoxysilane and dodecenyl succinic anhydride is 20:15:150:0.8:0.5.

[0031] A preparation method of the anti-ultraviolet aging asphalt comprises the following preparation steps: Step A, the base asphalt is heated to 170℃, uniformly stirred at 300rpm, and then stearic acid amide is added and stirred for 25min to obtain pretreated asphalt; Step B, the modified rubber is added into the pretreated asphalt, the temperature is adjusted to 180℃, and the mixture is subjected to high-speed shearing at 2200rpm for 38min, then the reinforcing filler is added, the temperature is maintained at 165℃, and the mixture is subjected to high-speed shearing for 25min, then the temperature is lowered to 145℃, the antioxidant is added, and the mixture is stirred at 500rpm for 18min to obtain an asphalt intermediate; Step C, the asphalt intermediate is subjected to constant temperature curing at 135℃ for 50min, and then naturally cooled to room temperature to obtain the anti-ultraviolet aging asphalt.

[0032] Example 3 An anti-ultraviolet aging asphalt comprises the following raw materials in parts by weight: 70# road petroleum asphalt 120 parts, modified rubber 15 parts, reinforcing filler 5 parts, antioxidant 1 part, and stearic acid amide 0.5 part, wherein the antioxidant is antioxidant 1010.

[0033] The preparation steps of the modified rubber are as follows: Step 1, the waste tire rubber, styrene butadiene rubber and chloroprene rubber are respectively crushed through a 100-mesh sieve, mixed according to a mass ratio of 10:5:3 to obtain mixed rubber powder, and then the mixed rubber powder is added into a microwave reaction kettle, and benzophenone and zinc stearate are added under nitrogen protection, and the mixture is subjected to microwave high-temperature treatment, wherein the microwave power is 700W, the temperature is 180℃, and the treatment time is 35min, to obtain devulcanized rubber, and the mass ratio of the mixed rubber powder, benzophenone and zinc stearate is 100:4:2; Step 2, the devulcanized rubber is added into toluene, stirred at 800 rpm at 60℃ for 30 min, maleic anhydride, KH-560 and benzoyl peroxide are added, the temperature is raised to 80℃, and the reaction is carried out under nitrogen protection for 1 h, toluene is removed by reduced pressure distillation, and the grafted rubber is obtained after drying, wherein the amount ratio of the devulcanized rubber, toluene, maleic anhydride, silane coupling agent and benzoyl peroxide is 80:100:6:3:1; Step 3, the grafted rubber, dicumyl peroxide and light stabilizer are uniformly stirred at 1200 rpm at 120℃ to obtain the composite modified rubber, wherein the amount ratio of the grafted rubber, dicumyl peroxide and light stabilizer is 120:2:8, and the light stabilizer is composed of light stabilizer 622, light stabilizer UV-P and cardanol with a mass ratio of 8:3:2.

[0034] The preparation method of the reinforcing filler is as follows: graphene and nano zinc oxide are added into anhydrous ethanol, uniformly stirred at 1000 rpm, and then vinyltrimethoxysilane and dodecenyl succinic anhydride are added, and the reinforcing filler is obtained after high-speed shearing at 3000 rpm for 20 min and drying at 80℃ for 12 h, wherein the mass ratio of graphene, nano zinc oxide, anhydrous ethanol, vinyltrimethoxysilane and dodecenyl succinic anhydride is 30:20:180:1:0.8.

[0035] A preparation method of an ultraviolet aging resistant asphalt, comprising the following preparation steps: Step A, the base asphalt is heated to 180℃, uniformly stirred at 400 rpm, and then stearic amide is added, and the stirring is continued for 30 min to obtain pretreated asphalt; Step B, the composite modified rubber is added into the pretreated asphalt, the temperature is adjusted to 190℃, high-speed shearing is carried out at 2500 rpm for 45 min, the reinforcing filler is added, the temperature is maintained at 170℃, high-speed shearing is carried out for 30 min, the temperature is lowered to 150℃, the antioxidant is added, and the stirring is carried out at 600 rpm for 20 min to obtain an asphalt intermediate: Step C, the asphalt intermediate is cured at 140℃ for 60 min, and then naturally cooled to room temperature to obtain the ultraviolet aging resistant asphalt.

[0036] Comparative Example 1 This comparative example is the same as Example 1, except that the preparation method of the composite modified rubber is different, which is as follows: The preparation steps of the composite modified rubber are as follows: Step 1, the waste tire rubber, styrene butadiene rubber and chlorobutyl rubber, respectively, after being crushed through 80 mesh sieve, mixed according to the mass ratio of 8:3:1, the mixed rubber powder was obtained, the mixed rubber powder, dicumyl peroxide and light stabilizer were uniformly stirred at 1000 rpm and 100℃, the modified composite rubber was obtained, wherein the amount ratio of the mixed rubber powder, dicumyl peroxide and light stabilizer was 100:1:3, and the light stabilizer was composed of light stabilizer 622, light stabilizer UV-P and cardanol with a mass ratio of 5:2:1.

[0037] Comparative example 2 The present comparative example is the same as example 1, except that the preparation method of the modified composite rubber is different, which is as follows: The preparation steps of the modified composite rubber are as follows: Step 1, the waste tire rubber, styrene butadiene rubber and chlorobutyl rubber, respectively, after being crushed through 80 mesh sieve, mixed according to the mass ratio of 8:3:1, the mixed rubber powder was obtained, the mixed rubber powder was added into a microwave reaction kettle, and benzophenone and zinc stearate were added under the protection of nitrogen, and then the devulcanized rubber was obtained after microwave high temperature treatment, the microwave power was 600W, the temperature was 160℃, and the treatment time was 25min, the mass ratio of the mixed rubber powder, benzophenone and zinc stearate was 100:2:1; Step 2, the devulcanized rubber was added into toluene, stirred at 500 rpm and 50℃ for 20min, then maleic anhydride, KH-560 and benzoyl peroxide were added, the temperature was increased to 70℃, and the reaction was carried out under the protection of nitrogen for 2h, then toluene was removed by reduced pressure distillation, and the grafted rubber was obtained after drying, wherein the amount ratio of the devulcanized rubber, toluene, maleic anhydride, silane coupling agent and benzoyl peroxide was 60:80:4:1:0.5; Step 3, the grafted rubber, dicumyl peroxide and light stabilizer were uniformly stirred at 1000 rpm and 100℃, the modified composite rubber was obtained, wherein the amount ratio of the grafted rubber, dicumyl peroxide and light stabilizer was 100:1:3, and the light stabilizer was composed of light stabilizer 622 and light stabilizer UV-P with a mass ratio of 5:2.

[0038] Comparative example 3 The present comparative example is the same as example 1, except that the preparation method of the reinforcing filler is different, which is as follows: The preparation method of the reinforcing filler is as follows: graphene and nano zinc oxide were added into anhydrous ethanol, stirred uniformly at 500 rpm, then dodecenyl succinic anhydride was added, and the reinforcing filler was obtained after high speed shearing at 2000 rpm for 10min and drying at 60℃ for 10h, the mass ratio of graphene, nano zinc oxide, anhydrous ethanol and dodecenyl succinic anhydride was 10:10:120:0.8.

[0039] Comparative Example 4 This comparative example is the same as Example 1, except that the preparation method of the reinforcing filler is different, as follows: The preparation method of the reinforcing filler is as follows: graphene and nano zinc oxide are added to anhydrous ethanol, stirred uniformly at a rotation speed of 500 rpm, then vinyltrimethoxysilane is added, high-speed sheared at a rotation speed of 2000 rpm for 10 min, dried at 60°C for 10 h, to obtain the reinforcing filler. The mass ratio of graphene, nano zinc oxide, anhydrous ethanol and vinyltrimethoxysilane is 10:10:120:0.8.

[0040] Performance test The anti-ultraviolet aging asphalt prepared in Examples 1-3 and Comparative Examples 1-4 is made into 25.0 cm x 3.0 cm x 3.5 cm (length x width x height), 3 parallel test pieces are prepared for each formula to ensure that the test piece surface is flat and free of cracks. The cut test piece is placed in a 60°C oven and dried for 2 hours to remove surface moisture to obtain the test piece to be tested: Ultraviolet aging experiment: the test piece to be tested is placed in an ultraviolet radiation test box, the aging temperature is 30±2°C, the ultraviolet radiation intensity is 300W / m 2 , the ultraviolet light type is UV-B type, and the test sample is taken out after 500h of ultraviolet radiation. The performance of the test sample before and after aging is tested as follows: Softening point: tested according to T 0606-2011 in JTG E20-2011 “Highway Engineering Asphalt and Asphalt Mixture Test Procedures”; Ductility test: tested according to T 0605-2011 in JTG E20-2011 “Highway Engineering Asphalt and Asphalt Mixture Test Procedures”; Penetration test: tested according to T0604-2011 in JTG E20-2011 “Highway Engineering Asphalt and Asphalt Mixture Test Procedures”; The specific test results are shown in Table 1.

[0041] Table 1 Performance parameters of anti-ultraviolet aging asphalt prepared in Examples 1-3 and Comparative Examples 1-4

[0042] As can be seen from Table 1, the anti-ultraviolet aging asphalt prepared by the present application can significantly improve the durability and crack resistance of the road, prolong the service life and reduce the maintenance cost. At the same time, its excellent anti-ultraviolet aging ability can reduce the performance degradation caused by environmental factors, improve the road flatness and comfort, has good economic and environmental benefits, is suitable for various harsh environments, and has a wide application prospect.

[0043] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A UV-resistant asphalt, characterized in that: The invention comprises the following raw materials in parts by weight: 100-120 parts of matrix asphalt, 5-15 parts of composite modified rubber, 2-5 parts of reinforcing filler, 0.5-1 part of antioxidant and 0.1-0.5 part of stearamide.

2. The anti-ultraviolet aging asphalt according to claim 1, characterized in that: The preparation steps of the composite modified rubber are: Step 1: Waste tire rubber, styrene-butadiene rubber and chloroprene rubber are crushed and sieved respectively, and then mixed to obtain mixed rubber powder. The mixed rubber powder is added to a microwave reactor, and benzophenone and zinc stearate are added under nitrogen protection. After microwave high-temperature treatment, devulcanized rubber is obtained; Step 2: Add the desulfurized rubber to toluene, stir at 50-60°C for 20-30 minutes, add maleic anhydride, silane coupling agent and initiator, raise the temperature to 70-80°C, react under nitrogen protection for 1-2 hours, remove toluene by vacuum distillation, and dry to obtain the grafted rubber; Step 3: Stir the grafted rubber, dicumyl peroxide and light stabilizer at a high speed at 100-120° C. to obtain a composite modified rubber.

3. The anti-ultraviolet aging asphalt according to claim 2, characterized in that: In the step 1, the mass ratio of waste tire rubber, styrene-butadiene rubber and chloroprene rubber is 8-10:3-5:1-3.

4. The anti-ultraviolet aging asphalt according to claim 2, characterized in that: In the step 2, the usage ratio of the devulcanized rubber, toluene, maleic anhydride, silane coupling agent and initiator is 60-80:80-100:4-6:1-3:0.5-1.

5. The anti-ultraviolet aging asphalt according to claim 2, characterized in that: In the step 3, the usage ratio of the grafted rubber, dicumyl peroxide and light stabilizer is 100-120:1-2:3-8.

6. The anti-ultraviolet aging asphalt according to claim 2, characterized in that: The light stabilizer consists of a hindered amine light stabilizer, a benzotriazole ultraviolet absorber and cardanol in a mass ratio of 5-8:2-3:1-2.

7. The anti-ultraviolet aging asphalt according to claim 1, characterized in that: The preparation method of the reinforcing filler comprises the following steps: adding graphene and nano zinc oxide into anhydrous ethanol, stirring evenly, adding vinyl trimethoxysilane and dodecenyl succinic anhydride, and subjecting the mixture to high-speed shearing and drying to obtain the reinforcing filler.

8. The anti-ultraviolet aging asphalt according to claim 7, characterized in that: The mass ratio of the graphene, nano zinc oxide, anhydrous ethanol, vinyl trimethoxysilane and dodecenyl succinic anhydride is 10-30:10-20:120-180:0.5-1:0.3-0.

8.

9. A method for preparing UV-resistant asphalt according to any one of claims 1 to 8, characterized in that: The method comprises the following preparation steps: Step A: Heat the base asphalt to 160-180° C., stir evenly, add stearamide, and continue stirring to obtain pretreated asphalt; Step B: Add the composite modified rubber to the pretreated asphalt, adjust the temperature to 170-190°C, high-speed shear for 30-45 minutes, add the reinforcing filler, maintain the temperature at 160-170°C, high-speed shear for 20-30 minutes, cool to 140-150°C, add the antioxidant, and stir for 15-20 minutes to obtain the asphalt intermediate: Step C: After the asphalt intermediate is aged at a constant temperature, it is naturally cooled to room temperature to obtain the UV-resistant asphalt.

10. The method for preparing UV-resistant asphalt according to claim 9, characterized in that: In step C, the constant temperature aging temperature is 130-140° C., and the constant temperature aging time is 40-60 minutes.

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