Composite regenerant for hot mix plant recycled asphalt mixture and preparation method of composite regenerant

Abstract

The invention discloses a composite regenerant for a hot mix plant recycled asphalt mixture, which is prepared from the following raw materials in parts by weight: 90 to 110 parts of furfural extract oil, 5 to 10 parts of triallyl isocyanurate, 2 to 6 parts of triethoxysilane, 4 to 10 parts of three-dimensional porous material, 3 to 8 parts of penetrant and 2 to 6 parts of toluene-2, 3-diketone. The component A is prepared from the following components in parts by weight: 20-30 parts of 1, 4-diisocyanate, 10-20 parts of hydroxyl-terminated polybutadiene, 5-12 parts of a plasticizer and 5-10 parts of a tackifier; by using the composite regenerant, the high-temperature stability, the low-temperature stability and the water stability of the hot-recycled asphalt mixture can be improved, the skid resistance and the sound absorption performance of the hot-recycled asphalt mixture can be improved, the mixing amount of a milling material can be up to 85% in plant-mixed hot-recycled asphalt mixture engineering application, and the economic cost is saved.

Description

Technical Field

[0001] The invention relates to a regenerated asphalt mixture, and in particular to a composite regeneration agent for factory-mixed hot regenerated asphalt mixture and a preparation method thereof. Background Art

[0002] Asphalt pavement recycling is a process of excavating, recycling, crushing, screening, adding appropriate amounts of new aggregates and new asphalt, remixing, and forming a recycled asphalt mixture that meets the road performance requirements, and then using it to pave the road or base. According to the construction temperature, asphalt pavement recycling technology can be divided into hot recycling and cold recycling; according to the different waste material mixing sites, it can be divided into on-site recycling and factory-mixed recycling. Therefore, asphalt pavement recycling technology includes: factory-mixed hot recycling, on-site hot recycling, factory-mixed cold recycling, on-site cold recycling and other construction methods. Factory-mixed hot recycling: It is to recycle the old asphalt mixture and concentrate it in the recycling mixing plant. Through crushing and screening, and according to the asphalt content, asphalt aging degree, crushed stone grading and other indicators in the recycled material, a certain amount of new aggregates, asphalt and regeneration agent (if necessary) and other materials are added, and then heated and mixed into a recycled mixture that meets the technical performance requirements of the road. Factory-mixed hot recycled asphalt mixture can be used for all pavement surface layers. The pavement paved with it and the pavement paved with a mixture made entirely of new materials almost meet the same performance requirements. For waste asphalt mixtures, hot recycling is an ideal recycling method that can maximize the role of asphalt pavement waste. The component blending theory is generally used in the design of the hot recycled mixture ratio. The performance of aged asphalt in RAP is restored by adding a higher grade asphalt or adding a regeneration agent. This not only increases the production cost of hot recycled asphalt mixtures, but also reduces the high temperature stability of hot recycled asphalt mixtures. Traditional hot recycled asphalt mixtures also have the problem of poor low temperature performance and fatigue resistance, which to a certain extent limits the promotion and application of hot recycled asphalt mixtures with high RAP content. In addition, the stability and skid resistance of hot recycled asphalt mixtures need to be further improved, and the sound absorption needs to be further strengthened.

[0003] Therefore, it is necessary to solve the problems of stability, fatigue resistance, skid resistance and sound absorption of factory-mixed hot recycled asphalt mixture. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a composite regeneration agent for factory-mixed hot-regenerated asphalt mixture and a preparation method thereof, so as to solve the problems of stability, fatigue resistance, skid resistance and sound absorption of factory-mixed hot-regenerated asphalt mixture.

[0005] The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture of the present invention comprises, by weight, 90-110 parts of furfural extracted oil, 5-10 parts of triallyl isocyanurate, 2-6 parts of triethoxysilane, 4-10 parts of three-dimensional porous material, 3-8 parts of penetrant, 20-30 parts of toluene-2,4-diisocyanate, 10-20 parts of terminal hydroxyl polybutadiene, 5-12 parts of plasticizer, and 5-10 parts of tackifier;

[0006] Further, the penetrant is petroleum ether;

[0007] Further, the plasticizer is dioctyl phthalate;

[0008] Further, the tackifier is petroleum resin;

[0009] Furthermore, the three-dimensional porous material is a three-dimensional porous fiber or a metal material;

[0010] Furthermore, the raw materials of the composite regeneration agent include, by weight, 100 parts of furfural extracted oil, 7 parts of triallyl isocyanurate, 4 parts of triethoxysilane, 7 parts of three-dimensional porous material, 6 parts of penetrant, 25 parts of toluene-2,4-diisocyanate, 15 parts of terminal hydroxyl polybutadiene, 8 parts of plasticizer, and 7 parts of viscosity enhancer.

[0011] The method for preparing the composite regeneration agent for factory-mixed hot-regenerated asphalt mixture of the present invention comprises the following steps:

[0012] S1, toluene-2,4-diisocyanate and a catalyst are mixed and heated to 80-100° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside;

[0013] S2, mixing furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate uniformly, adding penetrant, plasticizer and tackifier, and finally adding the product in step S1 and stirring continuously at a temperature of 60-90° C. for 1-4 hours;

[0014] Furthermore, in step S1, the catalyst is dibutyltin dilaurate.

[0015] Beneficial effects of the present invention: The composite regeneration agent for plant-mixed hot-regenerated asphalt mixture and the preparation method thereof of the present invention, the use of the composite regeneration agent can improve the high-temperature stability and low-temperature stability and water stability of the hot-regenerated asphalt mixture, and can improve the anti-skid and sound absorption performance of the hot-regenerated asphalt mixture. In the application of plant-mixed hot-regenerated asphalt mixture engineering, the content of milling material can be as high as 85%, saving economic costs. DETAILED DESCRIPTION

[0016] For a better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples.

[0017] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0018] The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture of this embodiment comprises 90-110 parts of furfural extracted oil, 5-10 parts of triallyl isocyanurate, 2-6 parts of triethoxysilane, 4-10 parts of three-dimensional porous material, 3-8 parts of penetrant, 20-30 parts of toluene-2,4-diisocyanate, 10-20 parts of terminal hydroxyl polybutadiene, 5-12 parts of plasticizer and 5-10 parts of tackifier. Triallyl isocyanurate can form a three-dimensional cross-linked network structure, and the tackifier and penetrant act together and the diffusion effect of the penetrant can improve the compatibility and anti-aging performance of the regeneration agent, so that the high temperature stability and adhesion of the regenerated asphalt are better. The three-dimensional porous material is used to improve the anti-skid and sound absorption of the hot-regenerated asphalt mixture, and can significantly improve the high temperature performance, low temperature performance, water stability and anti-cracking performance of the regenerated asphalt mixture. At the same time, the three-dimensional porous material also plays a "bridging" role, which can also improve the anti-aging and fatigue resistance of asphalt mixtures. The use of three-dimensional porous materials can reduce the creep rate of recycled asphalt mixtures, prevent the flow deformation of asphalt, and improve its high-temperature stability; at low temperatures, basalt fiber can greatly increase the dissipated energy ratio of recycled asphalt mixtures, thereby improving the stress relaxation ability of recycled asphalt mixtures. At the same time, triethoxysilane, toluene-2,4-diisocyanate, and terminal hydroxyl polybutadiene are combined to hydrogenate and reduce the aged asphalt and hydroxylate it, achieving the dual effects of chemical repair and physical repair. After hydrogenation and reduction, the strong polar oxygen-containing functional groups (carbonyl, sulfoxide, etc.) in the aged asphalt are converted into weakly polar ethers, esters and a small amount of hydroxyl groups, and toluene diisocyanate further reacts with hydroxyl groups. Hydrogenation and hydroxylate esterification significantly weaken the interaction between the aged asphalt molecules caused by hydrogen bonds, reduce the polarity of the aged asphalt, and thus significantly improve the macroscopic properties of the aged asphalt.

[0019] Preferably, the penetrant is petroleum ether; the plasticizer is dioctyl phthalate; and the tackifier is petroleum resin.

[0020] In a preferred embodiment, the composite regeneration agent raw materials include 100 parts of furfural extracted oil, 7 parts of triallyl isocyanurate, 4 parts of triethoxysilane, 7 parts of three-dimensional porous material, 6 parts of penetrant, 25 parts of toluene-2,4-diisocyanate, 15 parts of terminal hydroxyl polybutadiene, 8 parts of plasticizer, and 7 parts of tackifier by weight. The composite regeneration agent of this embodiment has the best effect.

[0021] The method for preparing the composite regeneration agent for factory-mixed hot-regenerated asphalt mixture in this embodiment comprises the following steps:

[0022] S1, toluene-2,4-diisocyanate and a catalyst are mixed and heated to 80-100° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside;

[0023] S2, mixing furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate uniformly, adding penetrant, plasticizer and tackifier, and finally adding the product in step S1 and stirring continuously at a temperature of 60-90° C. for 1-4 hours;

[0024] In this embodiment, in step S1, the catalyst is dibutyltin dilaurate.

[0025] Embodiment 1

[0026] The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture in this embodiment includes, by weight, 90 parts of furfural extracted oil, 5 parts of triallyl isocyanurate, 2 parts of triethoxysilane, 4 parts of three-dimensional porous material, 3 parts of penetrant, 20 parts of toluene-2,4-diisocyanate, 10 parts of terminal hydroxyl polybutadiene, 5 parts of plasticizer, and 5 parts of viscosity enhancer.

[0027] The preparation method thereof comprises the following steps:

[0028] S1, toluene-2,4-diisocyanate and dibutyltin dilaurate are mixed and heated to 80° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside;

[0029] S2, mix the furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate evenly, add the penetrant, plasticizer and tackifier, and finally add the product in step S1 and continue stirring at 60°C for 4 hours.

[0030] Embodiment 2

[0031] The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture in this embodiment includes, by weight, 110 parts of furfural extracted oil, 10 parts of triallyl isocyanurate, 6 parts of triethoxysilane, 10 parts of three-dimensional porous material, 8 parts of penetrant, 30 parts of toluene-2,4-diisocyanate, 20 parts of terminal hydroxyl polybutadiene, 12 parts of plasticizer, and 10 parts of viscosity enhancer.

[0032] The preparation method thereof comprises the following steps:

[0033] S1, toluene-2,4-diisocyanate and dibutyltin dilaurate are mixed and heated to 100° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside;

[0034] S2, mix the furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate evenly, add the penetrant, plasticizer and tackifier, and finally add the product in step S1 and continue stirring at 90°C for 2h.

[0035] Embodiment 3

[0036] The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture in this embodiment includes, by weight, 90 parts of furfural extracted oil, 10 parts of triallyl isocyanurate, 2 parts of triethoxysilane, 10 parts of three-dimensional porous material, 3 parts of penetrant, 30 parts of toluene-2,4-diisocyanate, 10 parts of terminal hydroxyl polybutadiene, 12 parts of plasticizer, and 5 parts of viscosity enhancer.

[0037] The preparation method thereof comprises the following steps:

[0038] S1, toluene-2,4-diisocyanate and dibutyltin dilaurate are mixed and heated to 85° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside;

[0039] S2, mix the furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate evenly, add the penetrant, plasticizer and tackifier, and finally add the product in step S1 and continue stirring at 85°C for 2h.

[0040] Embodiment 4

[0041] The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture in this embodiment includes, by weight, 110 parts of furfural extracted oil, 6 parts of triallyl isocyanurate, 6 parts of triethoxysilane, 5 parts of three-dimensional porous material, 7 parts of penetrant, 22 parts of toluene-2,4-diisocyanate, 18 parts of terminal hydroxyl polybutadiene, 7 parts of plasticizer, and 8 parts of viscosity enhancer.

[0042] The preparation method thereof comprises the following steps:

[0043] S1, toluene-2,4-diisocyanate and dibutyltin dilaurate are mixed and heated to 90° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside;

[0044] S2, mix the furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate evenly, add the penetrant, plasticizer and tackifier, and finally add the product in step S1 and continue stirring at 70°C for 1.8h.

[0045] Embodiment 5

[0046] The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture in this embodiment includes, by weight, 100 parts of furfural extracted oil, 8 parts of triallyl isocyanurate, 4 parts of triethoxysilane, 9 parts of three-dimensional porous material, 5 parts of penetrant, 23 parts of toluene-2,4-diisocyanate, 18 parts of terminal hydroxyl polybutadiene, 8 parts of plasticizer, and 7 parts of viscosity enhancer.

[0047] The preparation method thereof comprises the following steps:

[0048] S1, toluene-2,4-diisocyanate and dibutyltin dilaurate are mixed and heated to 95° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside;

[0049] S2, mix the furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate evenly, add the penetrant, plasticizer and tackifier, and finally add the product in step S1 and continue stirring at 75°C for 2.5 hours.

[0050] Embodiment 6

[0051] The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture in this embodiment includes, by weight, 100 parts of furfural extracted oil, 7 parts of triallyl isocyanurate, 4 parts of triethoxysilane, 7 parts of three-dimensional porous material, 6 parts of penetrant, 25 parts of toluene-2,4-diisocyanate, 15 parts of terminal hydroxyl polybutadiene, 8 parts of plasticizer, and 7 parts of viscosity enhancer.

[0052] The preparation method thereof comprises the following steps:

[0053] S1, toluene-2,4-diisocyanate and dibutyltin dilaurate are mixed and heated to 98° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside;

[0054] S2, mix the furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate evenly, add the penetrant, plasticizer and tackifier, and finally add the product in step S1 and continue stirring at 65°C for 4 hours.

[0055] In the above embodiment, the penetrant is petroleum ether; the plasticizer is dioctyl phthalate; and the tackifier is petroleum resin.

[0056] The performance test of the composite regeneration agent prepared in the embodiment was carried out, and the test results are as follows:

[0057]

[0058] The composite regeneration agent prepared by the invention is used to regenerate asphalt. The composite regeneration agent is mixed and heat-bonded with waste asphalt produced by milling, new asphalt, mineral powder and aggregate in a conventional manner to obtain a regenerated asphalt mixture.

[0059] The amount of recycled asphalt agent added is 3% of the mass of the old asphalt mixture, and the amount of waste asphalt added is 85%. Water immersion Marshall test, freeze-thaw splitting test, freeze-thaw splitting test, rutting dynamic stability test, and low-temperature beam bending test were carried out. The test results are as follows:

[0060] project Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Oil-stone ratio (%) 5.3 5.4 5.6 5.4 5.7 5.5 Residual stability after immersion in water (%) 97.5 98.4 96.5 98.8 97.1 98.3 Freeze-thaw splitting strength ratio (%) 92.1 93.5 90.6 93.9 91.8 94.1 Dynamic stability (%) 2550 2561 2534 2547 2559 2564 Destructive Strength 12.1 12.88 13.24 10.99 11.55 13.69 Stiffness modulus 3498 3479 3485 3491 3495 3498 Failure strain 2895 2900 2887 2904 2883 2902

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A composite regeneration agent for factory-mixed hot-regenerated asphalt mixture, characterized in that: The raw materials of the composite regeneration agent include 90-110 parts of furfural extracted oil, 5-10 parts of triallyl isocyanurate, 2-6 parts of triethoxysilane, 4-10 parts of three-dimensional porous material, 3-8 parts of penetrant, 20-30 parts of toluene-2,4-diisocyanate, 10-20 parts of terminal hydroxyl polybutadiene, 5-12 parts of plasticizer and 5-10 parts of tackifier by weight.

2. The composite regeneration agent for hot-regenerated asphalt mixture in a plant according to claim 1, characterized in that: The penetrant is petroleum ether.

3. The composite regeneration agent for plant-mixed hot-regenerated asphalt mixture according to claim 1, characterized in that: The plasticizer is dioctyl phthalate.

4. The composite regeneration agent for hot-regenerated asphalt mixture in a plant according to claim 1, characterized in that: The tackifier is petroleum resin.

5. The composite regeneration agent for factory-mixed hot-regenerated asphalt mixture according to claim 1, characterized in that: The three-dimensional porous material is a three-dimensional porous fiber or a metal material.

6. The composite regeneration agent for hot-regenerated asphalt mixture in a plant according to claim 1, characterized in that: The raw materials of the composite regeneration agent include, by weight, 100 parts of furfural extracted oil, 7 parts of triallyl isocyanurate, 4 parts of triethoxysilane, 7 parts of three-dimensional porous material, 6 parts of penetrant, 25 parts of toluene-2,4-diisocyanate, 15 parts of terminal hydroxyl polybutadiene, 8 parts of plasticizer, and 7 parts of tackifier.

7. The method for preparing a composite regeneration agent for hot-regenerated asphalt mixture in a plant according to claim 1, characterized in that: The following steps are involved: S1, toluene-2,4-diisocyanate and a catalyst are mixed and heated to 80-100° C. under nitrogen protection, and then hydroxy-terminated polybutadiene is slowly added to react until the isocyanate group content is constant, and then the product is vacuum distilled and set aside; S2, mix the furfural extracted oil, triallyl isocyanurate, triethoxysilane and toluene diisocyanate evenly, add the penetrant, plasticizer and tackifier, and finally add the product in step S1 and continue stirring at a temperature of 60-90° C. for 1-4 hours.

8. The method for preparing a composite regeneration agent for hot-regenerated asphalt mixture in a plant according to claim 7, characterized in that: In step S1, the catalyst is dibutyltin dilaurate.

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