High-temperature-stable durable composite modified asphalt and preparation method thereof

Abstract

The invention discloses high-temperature-stable durable composite modified asphalt and a preparation method thereof. The preparation method comprises the following steps: (1) adding rare earth metal sulfide and rubber powder into a mixture of waste oil and diglycolamine, and uniformly stirring; (2) sequentially adding the rubber powder and phosphite in the step (1) into the preheated matrix asphalt, and uniformly stirring; (3) adding a modifier into the asphalt in the step (2), and shearing at a high speed; and (4) uniformly mixing calcium-containing powder, boric acid powder, a reactive auxiliary agent and an initiator, adding the mixture into the asphalt obtained in the step (3), and stirring to obtain the high-temperature stable durable composite modified asphalt. The prepared composite modified asphalt is high in storage stability, the problem of separation of asphalt and rubber powder in the construction process is thoroughly solved, and meanwhile, the durability of a pavement is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of road construction materials, and in particular relates to high-temperature stable durable composite modified asphalt with rubber powder as a main modified material and a preparation method thereof. Background Art

[0002] With the development of the economy and society, the number of cars has increased year by year, and the number of waste tires generated has also increased significantly. If they are discarded, it will not only waste resources and cause serious pollution to the environment, but also, as tires are flammable and explosive materials, storing large quantities of them is very likely to cause safety hazards.

[0003] Rubber powder modified asphalt can realize the resource utilization and harmless application of waste tires. At the same time, rubber powder can significantly improve the fatigue cracking resistance and noise reduction effect of asphalt pavement, greatly improve the service performance and life of the pavement, and meet the requirements of green and low-carbon transformation of my country's transportation industry and high-quality development of the industry under the current global "dual carbon" background. However, a single rubber powder modified asphalt rubber asphalt system cannot form an effective network structure, the effect is not good, and the process is difficult to control. In addition, rubber asphalt is very easy to segregate, which has a great impact on the construction effect. Therefore, a composite modification process that can effectively solve the segregation phenomenon caused by the poor compatibility between components in rubber asphalt and significantly improve the performance of rubber asphalt has great practical significance for accelerating the application of rubber asphalt. Summary of the invention

[0004] The object of the present invention is to provide a high-temperature stable durable composite modified asphalt and a preparation method thereof.

[0005] The preparation method of the high temperature stable durable composite modified asphalt is as follows: (1) Add 0.1-3 parts by mass of rare earth metal sulfide to a mixture of 2-12 parts by mass of waste grease and 0.1-5 parts by mass of diglycolamine, stir evenly, pour into 10-60 parts by mass of rubber powder, stir evenly, and place in an oven at 100-150°C for 30 minutes; (2) 100 parts by mass of base asphalt is heated to 180-220°C, and the rubber powder from step (1) is added and stirred for 20-60 minutes; (3) Add 0.01-0.8 parts by weight of phosphite to the modified asphalt in step (2) and stir evenly; (4) adding 0.3-10 parts by weight of a modifier to the reaction product of step (3), and high-speed shearing at 170-180° C. for 10-60 min; (5) Mix the calcium-containing powder, boric acid powder, additives and initiator evenly, take 2-6 parts by mass and add them to the modified asphalt in step (4), stir for 30-180 minutes, and obtain a stable, durable and high-strength composite modified asphalt. The calcium-containing powder is 0.1-5 parts by mass, the reaction linker is 0.1-0.6 parts by mass, the initiator is 0.1-0.5 parts by mass, and the boric acid powder is 0.3-5 parts by mass.

[0006] Waste grease is a mixture of waste motor oil and waste vegetable oil, with the ratio of motor oil to vegetable oil ranging from 4:1 to 1:1.

[0007] Rare earth metals include one or more of lanthanum, cerium, praseodymium, neodymium, samarium, dysprosium, terbium, holmium, and gadolinium.

[0008] The rubber powder is raw rubber powder from waste tires, with a particle size of 20-60 meshes.

[0009] Phosphite is an environmentally friendly product, specifically one of triisooctyl phosphite, triisodecyl phosphite, trilauryl phosphite, tritridecyl phosphite, and tri(12-15-alkyl) phosphite.

[0010] The modifier is two or more of polyetherimide, succinic acid, polylactic acid, stearic acid and SBS.

[0011] The auxiliary agent is one of trimethylolpropane, monoaminosilane, diaminosilane, triaminosilane, secondary aminosilane and tertiary aminosilane, or a combination of two of them. The calcium-containing powder is one of calcium, calcium oxide, calcium chloride, calcium carbonate, calcium sulfate and calcium phosphate.

[0012] The initiator is one of dicumyl peroxide, benzoyl peroxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, tert-butyl peroxide and tert-butyl perbenzoate.

[0013] Compared with the prior art, the present invention has the following innovations: the reaction system of waste oil and rare earth metal compounds gives full play to the advantages of the high activity of both, promotes the formation of cross-linked structure in the system, enhances the storage stability of modified asphalt, and improves the high-temperature rutting resistance, low-temperature cracking resistance and durability of the composite modified asphalt mixture pavement. DETAILED DESCRIPTION

[0014] The following is a further description of the process and performance of the modified asphalt preparation method provided by the present invention in conjunction with specific examples, but the present invention is not limited to the following examples. Example 1

[0015] 2g of samarium sulfide powder was added to a mixture of 6g of waste grease (the ratio of engine oil to vegetable oil was 3:1) and 2g of diglycolamine, stirred and poured into 30g of rubber powder (30 mesh), stirred evenly, placed in an oven at 150°C for 30min, added to 100g of base asphalt preheated to 180°C, stirred for 30min, added with 0.4g of triisooctyl phosphite, continued to stir evenly, added 4g of a modifier with a mass ratio of succinic acid to SBS of 1:1, subjected to high-speed shearing at 175°C for 40min, and then added into the modified asphalt with a mixture of 3g of calcium powder, 2.4g of boric acid powder, 0.2g of triaminosilane and 0.2g of diisopropyl peroxide, and continued to stir for 40min to obtain a composite modified asphalt. Example 2

[0016] 2g of samarium sulfide powder was added to a mixture of 6g of waste grease (the ratio of engine oil to vegetable oil was 3:1) and 2g of diglycolamine, stirred and poured into 30g of rubber powder (30 mesh), stirred evenly, placed in an oven at 150°C for 30min, added to 100g of base asphalt preheated to 180°C, stirred for 30min, added with 0.4g of triisooctyl phosphite, continued to stir evenly, added 4g of a modifier with a mass ratio of succinic acid to SBS of 1:3, subjected to high-speed shearing at 175°C for 40min, and then added into the modified asphalt with a mixture of 3g of calcium powder, 2.4g of boric acid powder, 0.2g of triaminosilane and 0.2g of diisopropyl peroxide, and continued to stir for 40min to obtain a composite modified asphalt. Example 3

[0017] 2g of samarium sulfide powder was added to a mixture of 8g of waste grease (the ratio of engine oil to vegetable oil was 3:1) and 3g of diglycolamine, stirred and poured into 40g of rubber powder (30 mesh), stirred evenly, placed in an oven at 150°C for 30min, added to 100g of base asphalt preheated to 210°C, stirred for 30min, added with 0.4g of triisooctyl phosphite, continued to stir evenly, added 4g of a modifier with a mass ratio of succinic acid to SBS of 1:1, subjected to high-speed shearing at 175°C for 40min, and then added into a mixture of 2g of calcium powder, 2.4g of boric acid powder, 0.2g of triaminosilane and 0.2g of diisopropyl peroxide into the modified asphalt, and continued to stir for 40min to obtain a composite modified asphalt.

[0018] Technical indicators of rubber powder modified asphalt

Claims

1. A method for preparing a high-temperature stable and durable composite modified asphalt, characterized in that: The specific steps of the preparation method are: (1) Add 0.1-3 parts by mass of rare earth metal sulfide and 10-60 parts by mass of rubber powder to a mixture of 2-12 parts by mass of waste grease and 0.1-5 parts by mass of diglycolamine, stir evenly, and place in an oven at 100-150°C for 30 minutes; (2) 100 parts by mass of base asphalt is heated to 180-220°C, and the rubber powder from step (1) is added and stirred for 20-60 minutes; (3) Add 0.01-0.8 parts by weight of phosphite to the modified asphalt in step (2) and stir evenly; (4) adding 0.3-10 parts by weight of a modifier to the reaction product of step (3), and subjecting the reaction product to high-speed shearing at 170-180° C. for 10-60 min; (5) Mix the calcium-containing powder, boric acid powder, additives and initiator evenly, take 2-6 parts by mass and add them to the modified asphalt in step (4), stir at 190-210° C. for 30-180 min, and obtain a stable, durable and high-strength composite modified asphalt; wherein the calcium-containing powder is 0.1-5 parts by mass, the reaction linker is 0.1-0.6 parts by mass, the initiator is 0.1-0.5 parts by mass, and the boric acid powder is 0.3-5 parts by mass.

2. The preparation method according to claim 1, characterized in that: Waste grease is a mixture of waste motor oil and waste vegetable oil, with the ratio of motor oil to vegetable oil ranging from 4:1 to 1:

1.

3. The preparation method according to claim 1, characterized in that: Rare earth metals include one or more of lanthanum, cerium, praseodymium, neodymium, samarium, dysprosium, terbium, holmium, and gadolinium.

4. The preparation method according to claim 1, characterized in that: The rubber powder is waste tire rubber powder with a particle size of 20-60 mesh.

5. The preparation method according to claim 1, characterized in that: The phosphite is specifically one of triisooctyl phosphite, triisodecyl phosphite, trilauryl phosphite and tri(12-15 alkyl) phosphite.

6. The preparation method according to claim 1, characterized in that: The modifier is two or more of polyetherimide, succinic acid, polylactic acid, stearic acid and SBS.

7. The preparation method according to claim 1, characterized in that: The auxiliary agent is specifically one or more of aminosilane, epoxysilane, methacryloxysilane, vinylsilane, phenylsilane and sulfur-containing silane.

8. The preparation method according to claim 1, characterized in that: The calcium-containing powder is one or more of calcium, calcium oxide, calcium chloride, calcium carbonate, calcium sulfate and calcium phosphate.

9. The preparation method according to claim 1, characterized in that: The initiator is one or more of dicumyl peroxide, benzoyl peroxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, tert-butyl peroxide, and tert-butyl perbenzoate.

Images