A chemically modified high-viscosity and tough asphalt and its preparation method

Abstract

This invention provides a chemically modified high-viscosity and tough asphalt and its preparation method, comprising the following components in parts by weight: 100 parts base asphalt, 3-8 parts styrene-butadiene-styrene block copolymer, 2-10 parts composite petroleum resin, 0.1-4 parts maleic anhydride, 0.1-2 parts polyphosphoric acid, 0.05-0.15 parts crosslinking stabilizer, and 0.1-1 parts composite antioxidant. This modified high-viscosity and tough asphalt, obtained through chemical composite modification, not only possesses excellent high-temperature deformation resistance, elastic recovery performance, low-temperature flexibility, and fatigue resistance, but also exhibits improved compatibility between the asphalt and the modifier through chemical modification. The preparation method of this composite modified high-viscosity and tough asphalt is simple and yields excellent performance, making it suitable for ultra-thin wearing courses, heavy-duty asphalt pavements, bridge deck paving, and other fields.

Description

Technical Field

[0001] This invention relates to the field of road engineering construction and maintenance technology, specifically to a chemically composite modified high-viscosity and tough asphalt and its preparation method. Background Technology

[0002] Asphalt pavement, with its advantages of smooth surface, seamless construction, comfortable driving, and low noise, is widely used on high-grade highways. However, during use, asphalt pavement is susceptible to the combined effects of environmental and load factors, particularly asphalt aging, rapid increases in traffic volume, heavy overloading, and untimely maintenance. These factors can easily lead to pavement defects such as rutting, cracking, potholes, loose aggregate, and significant reduction in skid resistance, affecting the quality of pavement service. Strengthening research on new high-performance modified asphalt materials has become a hot topic in the industry. Furthermore, with the rapid development of my country's transportation industry, highway maintenance in my country also faces enormous pressure.

[0003] High-viscosity asphalt refers to modified asphalt with a dynamic viscosity greater than 20,000 Pa∙s at 60℃. It is commonly used in steel bridge deck paving, permeable asphalt pavement, and thin-layer overlays, effectively improving the high-temperature deformation resistance and durability of the pavement and reducing the cumulative deformation of the asphalt mixture. The preparation of high-viscosity asphalt mainly involves dispersing a high-volume (generally exceeding 10%) high-viscosity modifier into the asphalt using a colloid mill or shear mill. The high-viscosity modifier enhances the overall performance of the asphalt. Common high-viscosity modifiers include TPS (TAFPACK-SUPER) from Japan and SINOTPS from Shenzhen Haichuan. However, currently, high-viscosity modifiers are relatively expensive, and the modifier content in high-viscosity asphalt is also high, making high-viscosity asphalt more expensive than ordinary modified asphalt. Furthermore, the main components of current high-viscosity modifiers are mostly thermoplastic elastomers and tackifying resins. Their modification process for asphalt is primarily physical modification, but due to differences in density and molecular polarity between high-viscosity modifiers and asphalt, most high-viscosity asphalt currently suffers from poor storage stability.

[0004] For example, Chinese patent CN116063860A discloses a composite polymer-modified high-viscosity asphalt system. This system includes a modifier, a tackifying resin, a solubilizer, and a stabilizer. This high-viscosity asphalt system mainly uses SBS or styrene-isoprene-styrene (SIS) as the main modifier to improve various properties of the asphalt, while terpene resin or petroleum resin increases the system's viscosity. However, the modification process of this system is primarily physical modification and does not enhance the chemical interaction between the modifier and the asphalt; the compatibility between the asphalt and the modifier needs further improvement.

[0005] Chinese patent CN104513489B discloses a composite stabilizer for SBS modified asphalt. The system consists of a crosslinking agent, an accelerator, an activator, and a compatibilizer. It is mainly used to improve the compatibility between the SBS modifier and asphalt. However, the system has little effect on increasing the viscosity of SBS modified asphalt and does not belong to the category of high-viscosity modified asphalt. In addition, when the system is applied under high-temperature conditions, the SBS modifier is prone to aging.

[0006] Chinese patent CN116102895A discloses an aging-resistant high-viscosity modified asphalt. The system's modifiers include SBS and styrene-hydrogenated butadiene-styrene block copolymer (SEBS), an anti-aging agent, a viscosity reducer, a co-solvent, and a stabilizer. SBS and SEBS serve as the main modifiers in this system, improving the asphalt's road performance, while the anti-aging agent enhances the high-viscosity asphalt's aging resistance during mixing and construction. However, this invention uses a warm-mix agent as a viscosity reducer, which has a certain impact on the performance of the high-viscosity asphalt. Furthermore, the modification process of the asphalt by the modifiers is a physical modification, and the compatibility between the modifiers and the asphalt needs further improvement. Summary of the Invention

[0007] To address the problems of existing technologies, the present invention aims to provide a chemically modified high-viscosity and high-toughness asphalt and its preparation method. This asphalt not only possesses excellent high-temperature deformation resistance, elastic recovery performance, low-temperature flexibility, and fatigue resistance, but the chemical modification also improves the compatibility between the asphalt and the modifier.

[0008] The present invention achieves its objective through the following technical solution: a method for preparing chemically composite modified high-viscosity and tough asphalt, characterized in that it is made from the following components in parts by weight: 100 parts of base asphalt, 3-8 parts of styrene-butadiene-styrene block copolymer, 2-10 parts of composite petroleum resin, 0.1-4 parts of maleic anhydride, 0.1-2 parts of polyphosphoric acid, 0.05-0.15 parts of crosslinking stabilizer, and 0.1-1 parts of composite antioxidant;

[0009] Prepared according to the following method:

[0010] 1) Weigh the base asphalt and heat it to 160~170℃ until the base asphalt melts. Turn on the mechanical stirrer, and then slowly add the styrene-butadiene-styrene block copolymer into the base asphalt while maintaining the temperature at 160~170℃ to allow the styrene-butadiene-styrene block copolymer to fully swell, thus obtaining modified asphalt mixture I.

[0011] 2) Add composite petroleum resin and composite antioxidant to modified asphalt mixture I, raise the system temperature to 175~185℃, replace the mechanical mixer with a high-speed shear machine, control the speed of the high-speed shear machine to 3000~5000r / min, fully disperse the system, and the shearing time lasts for more than 60min to obtain modified asphalt mixture II.

[0012] 3) Add maleic anhydride to modified asphalt mixture II, maintain the temperature at 175~185℃, and continue shearing at 3000~5000r / min for 30min to obtain modified asphalt mixture III;

[0013] 4) Add polyphosphoric acid and crosslinking stabilizer to the modified asphalt mixture III, maintain the temperature at 175~185℃, and continue to shear at 3000~5000r / min for 30min. After shearing, let it stand at room temperature to obtain chemically modified high viscosity and toughness asphalt.

[0014] In the above scheme: the base asphalt is 70# or 90# heavy traffic petroleum asphalt.

[0015] In the above scheme: the styrene-butadiene-styrene block copolymer is YH-791, YH-791H, or YH-791E produced by Baling Petrochemical.

[0016] In the above scheme, the composite petroleum resin is composed of C5 petroleum resin and C9 petroleum resin in a mass ratio of 1:3.

[0017] In the above scheme: the maleic anhydride is industrial grade, and the content of effective substances is not less than 99%; the polyphosphoric acid is industrial grade, and the mass fraction of phosphoric acid (calculated as H3PO4) is 110%.

[0018] In the above scheme: the crosslinking stabilizer is industrial-grade sulfur.

[0019] In the above scheme: the composite antioxidant is composed of triphosphate and antioxidant 1010 in a mass ratio of 1:1.

[0020] A chemically modified high-viscosity and high-toughness asphalt prepared by the method described in the claims.

[0021] This invention utilizes styrene-butadiene-styrene block copolymer, composite petroleum resin, maleic anhydride, polyphosphoric acid, crosslinking stabilizer, and composite antioxidant as composite modifiers to modify asphalt, representing a novel approach to developing high-performance, high-viscosity asphalt. First, styrene-butadiene-styrene block copolymer, as the most common asphalt modifier, effectively improves the high and low temperature stability, mechanical properties, and water stability of asphalt, serving as the primary agent for enhancing the performance of high-viscosity asphalt. Second, the composite petroleum resin, composed of aliphatic and aromatic petroleum resins, can adjust the viscosity of high-viscosity asphalt while improving its adhesion to aggregates. Maleic anhydride, polyphosphoric acid, and crosslinking stabilizer are the main chemical modifiers in this invention. This invention first utilizes the Diels-Alder reaction between the double bonds in maleic anhydride and the butadiene structure in the styrene-butadiene-styrene block copolymer molecule. Furthermore, the anhydride reacts with the hydroxyl groups in the asphaltene component to form esters, acting as a bridge between the modifier and the asphalt, significantly improving the system's compatibility. Then, polyphosphoric acid is utilized to neutralize or esterify the active groups such as hydroxyl and imino groups in the asphalt, disrupting the original asphaltene cluster structure, improving its dispersibility in the light components of the asphalt, optimizing the spatial network structure, and improving the viscoelastic properties of the asphalt. Simultaneously, the crosslinking stabilizer (sulfur) reacts with the double bonds in the styrene-butadiene-styrene block copolymer molecule through a sulfurization reaction, improving the overall integrity of the SBS network structure in the asphalt, thereby enhancing the toughness and various road performance characteristics of the high-viscosity asphalt. Through this step-by-step reaction modification, the chemical modification of the base asphalt is ultimately achieved, improving its viscosity, stability, and mechanical properties. The composite antioxidant is a blend of triphosphate and phenolic antioxidant 1010, which effectively enhances the overall antioxidant capacity and significantly improves the aging resistance of high-viscosity asphalt during construction. Applying chemically modified high-viscosity and tough asphalt to ultra-thin wearing courses, heavy-duty asphalt pavements, and bridge deck paving can extend pavement service life, reduce maintenance costs, and lower resource consumption, aligning with the concept of green transportation development.

[0022] The chemical modification principle of the chemically composite modified high-viscosity asphalt of the present invention is as follows:

[0023]

[0024] The beneficial effects of this invention are reflected in the following aspects:

[0025] (1) Significantly improved road performance

[0026] This invention utilizes common SBS to improve the high and low temperature stability and mechanical properties of asphalt. It employs composite petroleum resins to regulate the viscosity and adhesion of the asphalt. Maleic anhydride, polyphosphoric acid, and cross-linking stabilizers further enhance the interaction between the modifier and asphalt, forming chemical bonds between the SBS modifier and asphalt components. This further enables the modifier to form a continuous spatial network structure within the asphalt, improving the compatibility between the modifier and asphalt, and ultimately enhancing the viscosity and toughness of the modified asphalt. The use of composite antioxidants significantly improves the aging resistance of high-viscosity and tough asphalt during high-temperature construction, extending its service life. By adjusting the material ratios of each modifier, the high and low temperature stability and viscosity-toughness of the high-viscosity and tough asphalt can be controlled to meet various engineering requirements.

[0027] (2) Extend the service life of roads

[0028] Applying this invention to ultra-thin wearing courses, heavy-duty asphalt pavements, and bridge deck paving can significantly improve the service life of pavement layers. For example, when applied to ultra-thin overlays, it can effectively address minor rutting, pitting, insufficient skid resistance, and cracking issues in the original pavement. When applied to heavy-duty pavements, it can significantly improve the load-bearing capacity of the surface layer, effectively resisting the impact of excessive loads on the surface layer and protecting the stability of the underlying structure. When applied to bridge deck paving, it can significantly improve the coordinated deformation capacity between the pavement layer and the bridge deck, while also increasing the load-bearing capacity of the pavement layer, ultimately extending the service life of the road.

[0029] (3) Economic advantages

[0030] Traditional high-viscosity asphalt often uses thermoplastic elastomers and tackifying resins as composite modifiers, achieving asphalt modification through high admixture amounts. The chemically composite modified high-viscosity and tough asphalt of this invention enhances the role of the modifier in the asphalt through chemical modification, significantly reducing the modifier dosage, and ultimately developing a high-viscosity and tough asphalt material with excellent performance and cost-effectiveness. Attached Figure Description

[0031] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0032] The present invention will be further described below with reference to embodiments.

[0033] The preparation methods of all embodiments of the present invention are as follows: Figure 1 All are:

[0034] 1) Weigh the base asphalt and heat it to 160~170℃ until the base asphalt melts. Turn on the mechanical stirrer at a speed of 300~500r / min. Then slowly add the styrene-butadiene-styrene block copolymer to the base asphalt and keep the temperature at 160~170℃ to allow the styrene-butadiene-styrene block copolymer to fully swell, thus obtaining modified asphalt mixture I.

[0035] 2) Add composite petroleum resin and composite antioxidant to modified asphalt mixture I, raise the system temperature to 175~185℃, replace the mechanical mixer with a high-speed shear machine, control the speed of the high-speed shear machine to 3000~5000r / min, fully disperse the system, and the shearing time lasts for more than 60min to obtain modified asphalt mixture II.

[0036] 3) Add maleic anhydride to modified asphalt mixture II, maintain the temperature at 175~185℃, and continue shearing at 3000~5000r / min for 30min to obtain modified asphalt mixture III.

[0037] 4) Add polyphosphoric acid and crosslinking stabilizer to the modified asphalt mixture III, maintain the temperature at 175~185℃, and continue to shear at 3000~5000r / min for 30min. After shearing, let it stand at room temperature to obtain chemically modified high viscosity and toughness asphalt.

[0038] The composite petroleum resin is composed of C5 petroleum resin and C9 petroleum resin in a mass ratio of 1:3. Maleic anhydride is industrial grade, with an effective substance content of not less than 99%. Polyphosphoric acid is industrial grade, with a phosphoric acid (calculated as H3PO4) mass fraction of 110%. The crosslinking stabilizer is industrial grade sulfur. The composite antioxidant is composed of triphosphite and antioxidant 1010 in a mass ratio of 1:1.

[0039] Example 1

[0040] The following substances and their mass fractions are shown in Table 1:

[0041] Table 1. Proportions of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 1

[0042]

[0043] The base asphalt is 70# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791H produced by Baling Petrochemical.

[0044] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared with traditional TPS modifier, the chemically modified high-viscosity and tough asphalt was comprehensively evaluated. The main properties of the product are shown in Table 2. Compared with TPS high-viscosity asphalt, the viscosity of the chemically modified high-viscosity and tough asphalt is nearly 8 times that of TPS asphalt, while exhibiting superior high-temperature stability, elastic recovery performance, and compatibility. After short-term aging, its mass change ratio and penetration ratio changed less, demonstrating excellent aging resistance.

[0045] Table 2 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 1

[0046]

[0047] Example 2

[0048] The following substances and their mass fractions are shown in Table 3:

[0049] Table 3. Proportions of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 2

[0050]

[0051] The base asphalt is 70# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791 produced by Baling Petrochemical.

[0052] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared by traditional TPS modifier, the chemically composite modified high-viscosity and tough asphalt was finally comprehensively evaluated. The main properties of the product are shown in Table 4. Compared with TPS high-viscosity asphalt, the viscosity of chemically composite modified high-viscosity and tough asphalt is nearly 4 times that of TPS asphalt, and it also has better high-temperature stability, elastic recovery performance, and compatibility. After short-term aging, its mass change ratio and penetration ratio change less, showing excellent aging resistance.

[0053] Table 4 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 2

[0054]

[0055] Example 3

[0056] The following substances and their mass fractions are shown in Table 5:

[0057] Table 5. Proportions of Chemically Modified High-Viscosity and Toughness Asphalt Material in Example 3

[0058]

[0059] The base asphalt is 90# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791 produced by Baling Petrochemical.

[0060] Referring to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011), the three major indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested. Compared with high-viscosity asphalt prepared by traditional TPS modifier, the chemically composite modified high-viscosity and tough asphalt was comprehensively evaluated. The main properties of the product are shown in Table 6. Compared with TPS high-viscosity asphalt, the viscosity of chemically composite modified high-viscosity and tough asphalt is nearly 6 times that of TPS asphalt, while exhibiting superior high-temperature stability, elastic recovery performance, and compatibility. After short-term aging, its mass change ratio and penetration ratio change less, demonstrating excellent aging resistance.

[0061] Table 6 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 3

[0062]

[0063] Example 4

[0064] The following substances and their mass fractions are shown in Table 7:

[0065] Table 7. Proportions of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 4

[0066]

[0067] The base asphalt is 90# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791E produced by Baling Petrochemical.

[0068] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared by traditional TPS modifier, the chemically composite modified high-viscosity and tough asphalt was finally comprehensively evaluated. The main properties of the product are shown in Table 8. Compared with TPS high-viscosity asphalt, the viscosity of chemically composite modified high-viscosity and tough asphalt is nearly 4 times that of TPS asphalt, and it also has better high-temperature stability, elastic recovery performance, and compatibility. After short-term aging, its mass change ratio and penetration ratio change are smaller, showing excellent aging resistance.

[0069] Table 8 Technical Indicators of Chemically Modified High-Viscosity and Toughness Asphalt in Example 4

[0070]

[0071] Example 5

[0072] The following substances and their mass fractions are shown in Table 9:

[0073] Table 9. Proportions of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 5

[0074]

[0075] The base asphalt is 70# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791E produced by Baling Petrochemical.

[0076] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared by traditional TPS modifier, the chemically composite modified high-viscosity and tough asphalt was finally comprehensively evaluated. The main properties of the product are shown in Table 10. Compared with TPS high-viscosity asphalt, the viscosity of chemically composite modified high-viscosity and tough asphalt is twice that of TPS high-viscosity asphalt, and it also has better high-temperature stability, elastic recovery performance, and compatibility. After short-term aging, its mass change ratio and penetration ratio change are smaller, showing excellent aging resistance.

[0077] Table 10 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 5

[0078]

[0079] Example 6

[0080] The following substances and their mass fractions are shown in Table 11:

[0081] Table 11. Proportions of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 6

[0082]

[0083] The base asphalt is 70# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791 produced by Baling Petrochemical.

[0084] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared with traditional TPS modifiers, the chemically modified high-viscosity and tough asphalt was comprehensively evaluated. The main properties of the product are shown in Table 12. Compared with TPS high-viscosity asphalt, the chemically modified high-viscosity and tough asphalt has higher viscosity and superior high-temperature stability, elastic recovery performance, and compatibility. After short-term aging, its mass change ratio and penetration ratio change less, demonstrating excellent aging resistance.

[0085] Table 12 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 6

[0086]

[0087] Example 7

[0088] The following substances and their mass fractions are shown in Table 13:

[0089] Table 13 Formulation of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 7

[0090]

[0091] The base asphalt is 70# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791H produced by Baling Petrochemical.

[0092] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared by traditional TPS modifier, the chemically composite modified high-viscosity and tough asphalt was finally comprehensively evaluated. The main properties of the product are shown in Table 14. Compared with TPS high-viscosity asphalt, the chemically composite modified high-viscosity and tough asphalt has a higher viscosity and better high-temperature stability, elastic recovery performance, and compatibility. After short-term aging, its mass change ratio and penetration ratio change less, showing excellent aging resistance.

[0093] Table 14 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 7

[0094]

[0095] Example 8

[0096] The following substances and their mass fractions are shown in Table 15:

[0097] Table 15 Formulation of Chemically Modified High-Viscosity and Toughness Asphalt Material in Example 8

[0098]

[0099] The base asphalt is 70# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791E produced by Baling Petrochemical.

[0100] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared with traditional TPS modifier, the chemically modified high-viscosity and tough asphalt was comprehensively evaluated. The main properties of the product are shown in Table 16. Compared with TPS high-viscosity asphalt, the chemically modified high-viscosity and tough asphalt has higher viscosity and superior high-temperature stability, elastic recovery performance, and compatibility. After short-term aging, its mass change ratio and penetration ratio change less, demonstrating excellent aging resistance.

[0101] Table 16 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 8

[0102]

[0103] Example 9

[0104] The following substances and their mass fractions are shown in Table 17:

[0105] Table 17 Formulation of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 9

[0106]

[0107] The base asphalt is 90# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791 produced by Baling Petrochemical.

[0108] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared by traditional TPS modifier, the chemically composite modified high-viscosity and tough asphalt was finally comprehensively evaluated. The main properties of the product are shown in Table 18. Compared with TPS high-viscosity asphalt, although the chemically composite modified high-viscosity and tough asphalt has a slightly lower softening point, it has a higher viscosity and better elastic recovery performance and compatibility. After short-term aging, its mass change ratio and penetration ratio change less, showing excellent aging resistance.

[0109] Table 18 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 9

[0110]

[0111] Example 10

[0112] The following substances and their mass fractions are shown in Table 19:

[0113] Table 19 Formulation of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 10

[0114]

[0115] The base asphalt is 90# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791E produced by Baling Petrochemical.

[0116] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared by traditional TPS modifier, the chemically composite modified high-viscosity and tough asphalt was finally comprehensively evaluated. The main properties of the product are shown in Table 20. Compared with TPS high-viscosity asphalt, although the chemically composite modified high-viscosity and tough asphalt has a slightly lower softening point, it has a higher viscosity and better elastic recovery performance and compatibility. After short-term aging, its mass change ratio and penetration ratio change less, showing excellent aging resistance.

[0117] Table 20 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 10

[0118]

[0119] Example 11

[0120] The following substances and their mass fractions are shown in Table 21:

[0121] Table 21. Proportions of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 11

[0122]

[0123] The base asphalt is 90# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791H produced by Baling Petrochemical.

[0124] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared with traditional TPS modifier, the chemically composite modified high-viscosity and tough asphalt was comprehensively evaluated. The main properties of the product are shown in Table 22. Due to the lower modifier dosage, the viscosity and high-temperature stability of the chemically composite modified high-viscosity and tough asphalt are comparable to those of TPS high-viscosity asphalt, but it still exhibits excellent compatibility. After short-term aging, its mass change ratio and penetration ratio show smaller changes, demonstrating excellent aging resistance.

[0125] Table 22 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 11

[0126]

[0127] Example 12

[0128] The following substances and their mass fractions are shown in Table 23:

[0129] Table 23 Formulation of Chemically Modified High-Viscosity and Tough Asphalt Material in Example 12

[0130]

[0131] The base asphalt is 70# heavy traffic petroleum asphalt, and its various properties meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40—2004). The SBS modifier is YH-791H produced by Baling Petrochemical.

[0132] After the high-viscosity and tough asphalt was prepared, its three main indicators, dynamic viscosity at 60℃, elastic recovery rate at 25℃, compatibility, and various properties after short-term aging were tested according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011). Compared with high-viscosity asphalt prepared with traditional TPS modifiers, the chemically composite modified high-viscosity and tough asphalt was comprehensively evaluated. The main properties of the product are shown in Table 24. Compared with TPS high-viscosity asphalt, the chemically composite modified high-viscosity and tough asphalt has lower viscosity and high-temperature stability due to insufficient modifier dosage, but still exhibits excellent compatibility. After short-term aging, the aging resistance of the chemically composite modified high-viscosity asphalt did not significantly improve. These results indicate that the composite modifier must be used at a certain dosage to fully exert its effect.

[0133] Table 24 Technical Indicators of Chemically Modified High-Viscosity and Tough Asphalt in Example 12

[0134]

[0135] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing chemically composite modified high-viscosity and tough asphalt, characterized in that, It is made from the following components in parts by weight: 100 parts base bitumen, 3-8 parts styrene-butadiene-styrene block copolymer, 2-10 parts composite petroleum resin, 0.1-4 parts maleic anhydride, 0.1-2 parts polyphosphoric acid, 0.05-0.15 parts crosslinking stabilizer, and 0.1-1 parts composite antioxidant; Prepared according to the following method: 1) Weigh the base asphalt and heat it to 160~170℃ until the base asphalt melts. Turn on the mechanical stirrer, and then slowly add the styrene-butadiene-styrene block copolymer into the base asphalt while maintaining the temperature at 160~170℃ to allow the styrene-butadiene-styrene block copolymer to fully swell, thus obtaining modified asphalt mixture I. 2) Add composite petroleum resin and composite antioxidant to modified asphalt mixture I, raise the system temperature to 175~185℃, replace the mechanical mixer with a high-speed shear machine, control the speed of the high-speed shear machine to 3000~5000r / min, fully disperse the system, and the shearing time lasts for more than 60min to obtain modified asphalt mixture II. 3) Add maleic anhydride to modified asphalt mixture II, maintain the temperature at 175~185℃, and continue shearing at 3000~5000r / min for 30min to obtain modified asphalt mixture III; 4) Add polyphosphoric acid and crosslinking stabilizer to the modified asphalt mixture III, maintain the temperature at 175~185℃, and continue to shear at 3000~5000r / min for 30min. After shearing, let it stand at room temperature to obtain chemically modified high viscosity and toughness asphalt.

2. The method for preparing chemically modified high-viscosity and tough asphalt according to claim 1, characterized in that: The base asphalt is 70# or 90# heavy-duty petroleum asphalt.

3. The method for preparing chemically modified high-viscosity and tough asphalt according to claim 2, characterized in that: The styrene-butadiene-styrene block copolymer is YH-791, YH-791H, or YH-791E produced by Baling Petrochemical.

4. The method for preparing chemically composite modified high-viscosity and tough asphalt according to any one of claims 1-3, characterized in that: The composite petroleum resin is composed of C5 petroleum resin and C9 petroleum resin in a mass ratio of 1:

3.

5. The method for preparing chemically modified high-viscosity and tough asphalt according to claim 4, characterized in that: The maleic anhydride is of industrial grade and has an effective substance content of not less than 99%; the polyphosphoric acid is of industrial grade and has an H3PO4 content of 110%.

6. The method for preparing chemically modified high-viscosity and tough asphalt according to claim 5, characterized in that: The crosslinking stabilizer is industrial-grade sulfur.

7. The method for preparing chemically modified high-viscosity and tough asphalt according to claim 6, characterized in that: The composite antioxidant is composed of triphosphate and antioxidant 1010 in a mass ratio of 1:

1.

8. A chemically modified high-viscosity and high-toughness asphalt prepared by the method of any one of claims 1-7.

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