Special high-performance modified asphalt for expressway pavement and preparation method of special high-performance modified asphalt

Abstract

The invention discloses special high-performance modified asphalt for an expressway pavement and a preparation method of the special high-performance modified asphalt. The special high-performance modified asphalt is prepared from the following raw materials in parts by weight: 60 to 70 parts of petroleum asphalt, 15 to 25 parts of silicon resin, 15 to 25 parts of polyurethane resin, 5 to 10 parts of inorganic whisker, 1 to 5 parts of antioxidant, 1.5 to 5.5 parts of UV absorbent, 3 to 8 parts of modified nano filler and 1.5 to 8.5 parts of organic bentonite. The preparation method of the modified nano filler comprises the following steps: firstly, adding thiourea and ammonium molybdate hydrate into a reaction kettle, then adding distilled water, stirring for 15-30 minutes at a rotating speed of 500-600r / min, then heating to 150-160 DEG C by a hydrothermal method, carrying out heat preservation stirring reaction for 3-5 hours, cooling to room temperature, carrying out suction filtration and water washing, and drying at 50-60 DEG C for 1-3 hours to obtain a nano additive; the preparation method comprises the following steps: sequentially adding hexamethyldisiloxane, phenyltrimethoxysilane, a nano auxiliary agent and concentrated sulfuric acid into a reaction kettle, then heating to 65-75 DEG C, stirring and reacting for 30-60 minutes, then dropwise adding a nonionic surfactant, stirring while dropwise adding, and finishing dropwise adding after 30-60 minutes; and carrying out reflux reaction for 1-2 hours, and drying to obtain the product.

Description

Technical Field

[0001] The present invention relates to the technical field of modified asphalt, and particularly to a high-performance modified asphalt for high-speed road surfaces and a preparation method thereof. Background Art

[0002] In the construction of expressways, asphalt, as one of the main materials, needs to have good economic and sustainable performance. The economic performance of expressway asphalt requires providing stable and durable pavement materials on the premise of controllable costs to ensure the safety and continuous operation of expressways. At the same time, the sustainable performance of expressway asphalt is also very important and needs to meet the requirements of environmental protection and sustainable development to reduce the negative impact on the environment. These requirements include but are not limited to low energy consumption, low pollution, high recycling rate, etc.

[0003] Asphalt has both viscosity and elasticity, manifested as its fluidity and anti-fluidity. At high temperatures, viscosity dominates and asphalt is easy to flow; at low temperatures, elasticity dominates and asphalt shows anti-fluidity. These characteristics are manifested in the road surface paved with asphalt. In the hot summer season, under the action of heavy loads, ruts are likely to appear on the road surface. In the cold winter season, temperature shrinkage cracks are likely to appear. Especially for the paving of long-span steel box girder bridges being built everywhere, higher requirements are put forward for the strength, deformation stability, fatigue durability, etc. of the paving materials. At the same time, special requirements such as light weight, high adhesiveness, and impermeability are put forward in terms of service performance. As an important part of the bridge vehicle system, the quality of the bridge deck paving directly affects the driving safety, comfort, bridge durability, and investment economic benefits. Obviously, such high performance requirements cannot be met by ordinary asphalt, and modified asphalt must be used.

[0004] There are many methods for asphalt modification. Most of them use polymer modification methods to change the natural properties of asphalt, that is, to improve the high-temperature rheological properties and low-temperature shrinkage cracking properties of asphalt. In CN1364823, a method for producing rubber-modified asphalt materials using organic grafting materials and / or cross-linking components is given; In CN1415663A, a polymer-rich matrix is made from an aromatic-rich and wax-poor component and a thermoplastic rubber. This matrix is used to make a uniformly dispersed asphalt composition with base asphalt, and a composite additive accounting for 0.1-0.5% of the total amount of asphalt is added to make a polymer-modified road asphalt product.

[0005] In USP5348994, a modified asphalt prepared from asphalt containing sulfonate or sulfonic acid groups, butyl rubber, SBS, sulfonated ethylene propylene diene monomer rubber, and a cationic neutralizer with a valence of +1 to +3 is given. The road surface paved with this material has improved viscoelasticity, an increased softening point, and improved storage stability; USP6399680 provides an asphalt component modified with a total amount of 0.02-3% sulfuric acid, phosphoric acid, glacial acetic acid and nitric acid as accelerators and a total amount of 0.2-15% copolymer containing epoxy groups; USP5604274 provides asphalt modified with a polymer containing epoxy groups in a total amount of 4-30% as component A, and component B is asphalt modified with amine, anhydride, alcohol, carboxylic acid and thiourea. A and B are mixed as paving materials, wherein component A is 80-95% and component B is 5-20%. The polymer containing epoxy groups forms a continuous phase in the asphalt, thereby obtaining asphalt with thermosetting properties; Generally speaking, polymer modified asphalt is used both at home and abroad. In China, asphalt is mainly modified by fillers and cross-linking materials, which is helpful to improve the use temperature and elasticity of asphalt. However, in terms of its compatibility, it is probably not good enough, the toughness is insufficient, the elongation is low, and it is difficult to meet the paving requirements of highways. In addition, it needs to be made on site. Due to the variability of on-site conditions and the differences in the quality of workers, there may be certain difficulties in quality control. For this reason, the present invention designs a high-performance modified asphalt specially used for highway pavement and a preparation method thereof. Summary of the invention

[0006] In order to solve the problems mentioned in the above background technology, the present invention provides a high-performance modified asphalt specially used for high-speed pavement and a preparation method thereof.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A high-performance modified asphalt specially used for high-speed pavement, comprising the following raw materials in parts by weight: 60-70 parts of petroleum asphalt, 15-25 parts of silicone resin, 15-25 parts of polyurethane resin, 5-10 parts of inorganic whiskers, 1-5 parts of antioxidant, 1.5-5.5 parts of UV absorber, 3-8 parts of modified nano filler, and 1.5-8.5 parts of organic bentonite.

[0008] Preferably, the modified nanofiller preparation method comprises the following steps: First, thiourea and hydrated ammonium molybdate are added to a reaction kettle, and then distilled water is added, and the mixture is stirred at a speed of 500-600 r / min for 15-30 minutes, and then the temperature is hydrothermally raised to 150-160° C., and the mixture is stirred and reacted for 3-5 hours. After cooling to room temperature, the mixture is filtered, washed with water, and then dried at 50-60° C. for 1-3 hours to obtain a nano additive; Hexamethyldisiloxane, phenyltrimethoxysilane, nano-additive and concentrated sulfuric acid are added to the reaction kettle in sequence, and then heated to 65-75°C, stirred for reaction for 30-60 minutes, and then a non-ionic surfactant is added dropwise, stirring while adding, and the addition is completed within 30-60 minutes; after reflux reaction for 1-2 hours, the mixture is dried to obtain the product.

[0009] Thiourea reacts with hydrated ammonium molybdate under hydrothermal conditions at 150-160°C. The Mo 6+ Restore to Mo 4+ , and S 2- Combined to form MoS2 nanosheets; MoS 2 The layered structure (strong covalent bonds within the layers and weak van der Waals forces between the layers) gives it high in-plane thermal conductivity, which can accelerate the heat dissipation of asphalt and reduce high-temperature rutting deformation; MoS 2 The nanosheets are embedded in the asphalt matrix through physical cross-linking to form a rigid skeleton and improve the shear strength.

[0010] In the process of silane hydrolysis and condensation, hexamethyldisiloxane and phenyltrimethoxysilane are used to form a siloxane network under the catalysis of concentrated sulfuric acid. The addition of non-ionic surfactants can help disperse the nano-additives and prevent agglomeration, thereby evenly dispersing them in the asphalt and improving the uniformity of the composite material. In addition, the introduction of phenyl groups may enhance the compatibility with the aromatic components in the asphalt and improve the interface bonding.

[0011] Preferably, the nonionic surfactant is one of 2-ethylhexanol, methyl phenylacetate and diethyl phthalate.

[0012] The nonionic surfactant is adsorbed on the surface of the nanofiller during the dropwise addition process, inhibiting the MoS 2 Agglomeration of nanosheets ensures their uniform dispersion in the bitumen, thus maximizing filler utilization.

[0013] Preferably, the petroleum asphalt is at least one of 90# petroleum asphalt, 100# petroleum asphalt, 110# petroleum asphalt, and 120# petroleum asphalt.

[0014] Preferably, the silicone resin includes at least one of methylphenyl silicone resin, methyl silicone resin, silicone resin emulsion, and high-temperature silicone resin.

[0015] Preferably, the inorganic whisker is at least one of aluminum borate whisker, potassium titanate whisker, calcium sulfate whisker and zinc oxide whisker.

[0016] Preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant 164.

[0017] Preferably, the UV absorber is at least one of 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-acryloyloxyethoxybenzophenone, and 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can greatly improve the wear resistance and impact resistance of asphalt materials by replacing conventional fillers with the prepared modified nanofillers; the present invention can effectively enhance the interfacial bonding performance between nano-additives and polyurethane resins by introducing modified nanofillers, thereby effectively avoiding the problem that conventional fillers are not easy to disperse in asphalt materials and improving their reinforcement effect. The nanofillers are more evenly distributed in the asphalt materials and can form a more stable microstructure, thereby making the prepared asphalt materials more impact-resistant.

[0019] 2. The present invention can optimize the toughness of asphalt materials through the combined effect of modified nanofillers and other components, so that the prepared asphalt materials can show better fracture resistance when impacted. The synergistic effect between the various components in the modified nanofillers can greatly improve the damping performance of the asphalt materials, so that they can show better wear resistance and impact resistance under dynamic loads. At the same time, MoS 2 The synergistic effect of nanosheets and siloxane coating significantly improves the mechanical properties and durability of asphalt through physical crosslinking and interface optimization. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Unless otherwise specified, the raw materials used in the present invention are all conventional products purchased from the market. The polyurethane resin was purchased from Shanghai Qizhan New Material Technology Co., Ltd., model ML-1001P; The organic bentonite was purchased from Sishui County Shengxin Refractory Materials Co., Ltd., model number 1524554.

[0022] Preparation Example 1: The preparation method of the modified nanofiller comprises the following steps: S1, add 100g thiourea and 80g ammonium molybdate hydrate into a reactor, then add 150mL distilled water, and stir at 500r / min for 15min; S2, hydrothermally heat the mixture to 150°C, stir and react for 3 hours, cool to room temperature, filter, wash with water, and dry at 50°C for 1 hour to obtain a nano additive; S3, 50g hexamethyldisiloxane, 45g phenyltrimethoxysilane, 100g nano-additive and 10mL concentrated sulfuric acid were added to the reactor in sequence, heated to 65°C, and stirred for reaction for 30min; S4, add 35 mL of non-ionic surfactant 2-ethylhexanol dropwise, stirring while adding, and complete the addition within 30 minutes; reflux the reaction for 1 hour, and then dry to obtain the modified nanofiller.

[0023] Preparation Example 2: The preparation method of the modified nanofiller comprises the following steps: S1, add 100g thiourea and 80g ammonium molybdate hydrate into the reactor, then add 150mL distilled water, and stir at 550r / min for 25min; S2, hydrothermally heat the mixture to 155°C, stir and react for 4 hours, cool to room temperature, filter, wash with water, and dry at 55°C for 2 hours to obtain a nano additive; S3, 50g hexamethyldisiloxane, 45g phenyltrimethoxysilane, 100g nano-additive and 10mL concentrated sulfuric acid were added to the reactor in sequence, heated to 70°C, and stirred for reaction for 45min; S4, add 35 mL of non-ionic surfactant methyl phenylacetate dropwise, stirring while adding, and complete the addition within 45 minutes; reflux reaction for 2 hours, and then dry to obtain the modified nanofiller.

[0024] Preparation Example 3: The preparation method of the modified nanofiller comprises the following steps: S1, add 100g thiourea and 80g ammonium molybdate hydrate into a reactor, then add 150mL distilled water, and stir at 600r / min for 30min; S2, hydrothermally heat the mixture to 160°C, stir and react for 5 hours, cool to room temperature, filter, wash with water, and dry at 60°C for 3 hours to obtain a nano additive; S3, 50g hexamethyldisiloxane, 45g phenyltrimethoxysilane, 100g nano-additive and 10mL concentrated sulfuric acid were added to the reactor in sequence, heated to 75°C, and stirred for reaction for 60min; S4, add 35 mL of non-ionic surfactant diethyl phthalate dropwise, stirring while adding, and complete the addition within 60 minutes; reflux reaction for 2 hours, and then dry to obtain the modified nanofiller.

[0025] Embodiment 1: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 60g of 90# petroleum asphalt to 165°C, then add 15g of methylphenyl silicone resin, 15g of polyurethane resin, 5g of aluminum borate whisker, 1g of antioxidant 1010, 1.5g of 2-hydroxy-4-n-octyloxybenzophenone, 3g of the modified nanofiller prepared in Preparation Example 1, and 1.5g of organic bentonite and stir evenly to obtain the product.

[0026] Embodiment 2: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 65g of 90# petroleum asphalt to 165°C, then add 20g of methylphenyl silicone resin, 20g of polyurethane resin, 8g of aluminum borate whisker, 3g of antioxidant 1010, 3g of 2-hydroxy-4-n-octyloxybenzophenone, 5g of the modified nanofiller prepared in Preparation Example 1, and 5g of organic bentonite and stir evenly to obtain the product.

[0027] Embodiment 3: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 70g of 90# petroleum asphalt to 165°C, then add 25g of methylphenyl silicone resin, 20g of polyurethane resin, 10g of aluminum borate whisker, 5g of antioxidant 1010, 5.5g of 2-hydroxy-4-n-octyloxybenzophenone, 8g of the modified nanofiller prepared in Preparation Example 1, and 8.5g of organic bentonite and stir evenly to obtain the product.

[0028] Embodiment 4: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 60g of 90# petroleum asphalt to 185°C, then add 15g of methylphenyl silicone resin, 15g of polyurethane resin, 5g of aluminum borate whisker, 1g of antioxidant 1010, 1.5g of 2-hydroxy-4-n-octyloxybenzophenone, 3g of the modified nanofiller prepared in Preparation Example 2, and 1.5g of organic bentonite and stir evenly to obtain the product.

[0029] Embodiment 5: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 60g of 100# petroleum asphalt to 210°C, then add 15g of methyl silicone resin, 15g of polyurethane resin, 5g of potassium titanate whisker, 1g of antioxidant 168, 1.5g of 2-hydroxy-4-acryloyloxyethoxy benzophenone, 3g of the modified nanofiller prepared in Preparation Example 2, and 1.5g of organic bentonite and stir evenly to obtain the product.

[0030] Embodiment 6: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 65g of 110# petroleum asphalt to 185°C, then add 20g of silicone resin emulsion, 20g of polyurethane resin, 8g of calcium sulfate whisker, 3g of antioxidant 1010, 3g of 2-hydroxy-4-n-octyloxybenzophenone, 5g of the modified nanofiller prepared in Preparation Example 2, and 5g of organic bentonite and stir evenly to obtain the product.

[0031] Embodiment 7: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 65g of 110# petroleum asphalt to 210°C, then add 20g of methylphenyl silicone resin, 20g of polyurethane resin, 8g of calcium sulfate whisker, 3g of antioxidant 1076, 3g of 2-hydroxy-4-n-octyloxybenzophenone, 5g of the modified nanofiller prepared in Preparation Example 3, and 5g of organic bentonite and stir evenly to obtain the product.

[0032] Embodiment 8: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 70g of 120# petroleum asphalt to 185°C, then add 25g of methylphenyl silicone resin, 20g of polyurethane resin, 10g of zinc oxide whisker, 5g of antioxidant 1010, 5.5g of 2-hydroxy-4-n-octyloxybenzophenone, 8g of the modified nanofiller prepared in Preparation Example 3, and 8.5g of organic bentonite and stir evenly to obtain the product.

[0033] Embodiment 9: A method for preparing high-performance modified asphalt specially used for high-speed pavement comprises the following steps: Heat 70g of 90# petroleum asphalt to 200°C, then add 25g of high-temperature silicone resin, 20g of polyurethane resin, 10g of aluminum borate whisker, 5g of antioxidant 164, 5.5g of 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 8g of the modified nanofiller prepared in Preparation Example 3, and 8.5g of organic bentonite and stir evenly to obtain the product.

[0034] Comparative Example 1: The difference between this comparative example and Example 1 is that no modified nanofiller is added.

[0035] Comparative Example 2: The difference between this comparative example and Example 1 is that the modified nanofiller prepared in Preparation Example 1 is replaced by common commercially available slaked lime purchased from Jinan Ruishengyuan Chemical Co., Ltd.

[0036] Comparative Example 3: The difference between this comparative example and Example 1 is that no nonionic surfactant is added during the preparation of the modified nanofiller in Preparation Example 1.

[0037] Wear resistance test: GB 1689-1998 was used as the experimental standard, and the mass loss of the sample was measured using an Akron wear test machine.

[0038] Ductility: GB / T0605-1993 is used as the experimental standard to test the ductility of the sample at 5°C; (anti-deformation ability).

[0039] High temperature stability test: GB / T 0606-2000 is used as the experimental standard, and the ring and ball method is used to test the softening point of the sample.

[0040] The experimental steps are as follows: cast the sample in a circular ring with an inner diameter of 19 mm, place a steel ball weighing 3.5 g on the ring, use water as the medium, heat at a rate of 5°C / min, and the sample gradually softens. Under the load of the steel ball, the temperature when the asphalt sinks to the specified distance (25.4 mm) is recorded as the softening point.

[0041] 60℃ dynamic viscosity: the detection method is JTG E20 T0620, and the technical requirement is ≥200000.

[0042] The performance test results of the products in Examples 1-9 and Comparative Examples 1-3 are shown in Table 1: Table 1

[0043] In summary, MoS 2 The synergistic effect of nanosheets and siloxane coatings significantly improves the mechanical properties and durability of asphalt through physical crosslinking and interface optimization; the multi-level composite of inorganic whiskers (micrometer level), resin network (submicrometer level), and nanofiller (nanometer level) achieves a mechanical response that is both rigid and flexible; the triple protection of chemical antioxidants, physical UV shielding, and hydrophobic barriers systematically extends the service life of asphalt. Through multi-component synergistic optimization, the present invention can meet the performance requirements of high-speed pavements in harsh environments such as high temperature, heavy load, and heavy rain, and has significant engineering application potential.

[0044] The high-performance modified asphalt obtained by the preparation method of the present application has various performance indicators that meet the relevant indicators of the "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), and its viscosity at 60°C meets the technical requirement of greater than 200,000 Pa·s, thereby effectively improving the adhesion, high temperature stability, and fatigue durability of the asphalt pavement, effectively improving the tensile, shear, compressive and impact strengths, and improving its thermal stability and low temperature resistance.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-performance modified asphalt specially used for high-speed pavement, characterized in that: The raw materials include the following parts by weight: 60-70 parts of petroleum asphalt, 15-25 parts of silicone resin, 15-25 parts of polyurethane resin, 5-10 parts of inorganic whiskers, 1-5 parts of antioxidant, 1.5-5.5 parts of UV absorber, 3-8 parts of modified nano filler, and 1.5-8.5 parts of organic bentonite.

2. The high-performance modified asphalt for highway pavement according to claim 1, characterized in that: The preparation method of the modified nanofiller comprises the following steps: S1. Add thiourea and hydrated ammonium molybdate into a reactor, then add distilled water, and stir at a speed of 500-600 r / min for 15-30 min; S2, hydrothermally heat the mixture to 150-160°C, stir and react for 3-5 hours, cool to room temperature, filter, wash with water, and dry at 50-60°C for 1-3 hours to obtain a nano additive; S3, add hexamethyldisiloxane, phenyltrimethoxysilane, nano additives and concentrated sulfuric acid to the reaction kettle in sequence, heat to 65-75°C, and stir to react for 30-60 minutes; S4, adding a nonionic surfactant dropwise while stirring, and the addition is completed within 30-60 minutes; after reflux reaction for 1-2 hours, the modified nanofiller is obtained by drying.

3. The high-performance modified asphalt for highway pavement according to claim 2, characterized in that: The nonionic surfactant is one of 2-ethylhexanol, methyl phenylacetate and diethyl phthalate.

4. The high-performance modified asphalt for highway pavement according to claim 1, characterized in that: The petroleum asphalt is at least one of 90# petroleum asphalt, 100# petroleum asphalt, 110# petroleum asphalt, and 120# petroleum asphalt.

5. The high-performance modified asphalt for highway pavement according to claim 1, characterized in that: The silicone resin includes at least one of methylphenyl silicone resin, methyl silicone resin, silicone resin emulsion, and high-temperature silicone resin.

6. The high-performance modified asphalt for highway pavement according to claim 1, characterized in that: The inorganic whisker is at least one of aluminum borate whisker, potassium titanate whisker, calcium sulfate whisker and zinc oxide whisker.

7. The high-performance modified asphalt for highway pavement according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010 , antioxidant 168 , antioxidant 1076 , and antioxidant 164 .

8. The high-performance modified asphalt for highway pavement according to claim 1, characterized in that: The UV absorber is at least one of 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-acryloyloxyethoxybenzophenone, and 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole.

9. A method for preparing high-performance modified asphalt for highway pavement according to any one of claims 1 to 8, characterized in that: The following steps are involved: The raw materials in parts by weight are weighed, petroleum asphalt is heated to 165-210° C., and then silicone resin, polyurethane resin, inorganic whisker, antioxidant, UV absorber, modified nano filler and organic bentonite are added and stirred evenly to obtain the product.

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