Rubber-plastic alloy high-viscosity modified asphalt and preparation method therefor

Abstract

A rubber-plastic alloy high-viscosity modified asphalt and a preparation method therefor. The modified asphalt comprises the following raw materials in parts by weight: 100 parts of matrix asphalt, 6-25 parts of a modifier, 0-12 parts of a cosolvent, 0.2-0.4 parts of a stabilizer, and 0.2-1.0 parts of a coupling agent. The high-viscosity modified asphalt can not only improve the high- and low-temperature performance of the asphalt, but can also improve the viscosity, toughness and durability of the asphalt.

Description

A rubber-plastic alloy high-viscosity modified asphalt and its preparation method

[0001] This application claims priority to a prior application, patent application number 202310925692X, filed with the State Intellectual Property Office of China on July 26, 2023, entitled “A Rubber-Plastic Alloy High-Viscosity Modified Asphalt and Its Preparation Method.” The entire text of the prior application is incorporated herein by reference. Technical Field

[0002] The invention belongs to the technical field of asphalt modification, and in particular relates to a rubber-plastic alloy high-viscosity asphalt and a preparation method thereof. Background Art

[0003] Ultra-thin overlay is a preventative maintenance technology that involves milling and paving an old pavement layer of fine-graded asphalt concrete 15-20 mm thick. This technology effectively improves pavement defects such as minor rutting and cracking, improves skid resistance, and reduces road noise, effectively extending the pavement's service life and reducing lifecycle maintenance costs. Due to its relatively thin thickness, ultra-thin overlays only slightly improve the pavement's overall bearing capacity. However, due to the significant shear stresses in the surface layer during braking, cornering, and slow traffic, the asphalt mixture used for ultra-thin overlays must meet certain strength requirements. The asphalt used must possess high modulus, bond strength, and fatigue resistance.

[0004] The existing ultra-thin overlay technology has a great risk to its durability due to the use of discontinuous grading. At the same time, the use of expensive synchronous integrated paver Novapaver and special tack coat oil Novabinder results in very high construction and maintenance costs, making large-scale promotion difficult. However, since then, under the leadership of the Ministry of Transport's Highway Research Institute and other institutions, relatively mature asphalt mixture design indicators and methods have been formed, and special high-viscosity additives (HVA) have been developed. The binders currently used for ultra-thin overlays include high-viscosity modifiers and high-viscosity modified asphalt. High-viscosity modifiers are usually used in the dry production process of concrete. The production process is difficult to control and stability is difficult to ensure. Compared with high-viscosity modifiers, high-viscosity modified asphalt is easier to control through technical indicators for quality control and has better stability between different batches. However, the high viscosity of high-viscosity modified asphalt and the large amount of modifier added make storage and transportation difficult and the cost is high, which affects customer acceptance.

[0005] Ultra-thin overlays are gaining increasing attention as a corrective pavement maintenance solution for high-grade roads with heavy traffic loads and demanding pavement performance. The Ministry of Transport has clarified the technical requirements for thin and ultra-thin overlays in the "Technical Specifications for Preventive Maintenance of Highway Asphalt Pavements" (JTG / T5142-01-2021). It also sets higher quality standards for the high-viscosity asphalt used, including enhanced requirements for softening point, dynamic viscosity at 60°C, ductility at 5°C, toughness, and viscosity-toughness. Existing products struggle to meet these standards.

[0006] Summary of the Invention

[0007] In order to improve the above technical problems, the present invention provides a rubber-plastic alloy high-viscosity modified asphalt, the raw materials of which include:

[0008] According to an embodiment of the present invention, the modified asphalt comprises:

[0009] According to an embodiment of the present invention, the colloid instability index Ic of the matrix asphalt is in the range of 0.1-0.5, preferably 0.15-0.4, and more preferably 0.18-0.3.

[0010] According to an embodiment of the present invention, the modifier includes a rubber modifier, a resin modifier, and a plastic modifier.

[0011] According to an embodiment of the present invention, the rubber modifier is selected from one or more combinations of SBS, SEBS, SIS, SBR, and activated rubber powder.

[0012] According to an embodiment of the present invention, the resin modifier is selected from one or a combination of C5 petroleum resin and C9 petroleum resin;

[0013] According to an embodiment of the present invention, the plastic modifier is selected from one or a combination of LDPE resin and HDPE resin.

[0014] Preferably, the modifier is selected from at least one of SBS, SEBS, SBR, C9 petroleum resin, C5 petroleum resin, and LDPE resin.

[0015] According to an embodiment of the present invention, the content of the modifier is 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, and 20 parts by weight.

[0016] According to an embodiment of the present invention, the cosolvent comprises one of aromatic oil, furfural extracted oil, and vacuum wax oil plant extender; preferably, the cosolvent comprises aromatic oil, and more preferably, the aromatic content of the aromatic oil is greater than 80%.

[0017] According to an embodiment of the present invention, the content of the co-solvent is 5 parts by weight, 6 parts by weight, 7 parts by weight, or 8 parts by weight.

[0018] According to an embodiment of the present invention, the stabilizer is selected from Runfeng Boyue stabilizer; the content of the stabilizer is 0.25 parts by weight, 0.3 parts by weight, 0.35 parts by weight, and 0.4 parts by weight.

[0019] According to an embodiment of the present invention, the coupling agent is selected from a siloxane coupling agent (KH2560). The content of the coupling agent is 0.3 parts by weight, 0.35 parts by weight, 0.4 parts by weight, 0.45 parts by weight, and 0.5 parts by weight.

[0020] The present invention also provides a method for preparing the modified asphalt, which comprises the following steps:

[0021] S1) mixing the base asphalt with a portion of the modifier, swelling the mixture, and obtaining a premix;

[0022] S2) heating and mixing the premix, modifier, cosolvent, stabilizer, and coupling agent, and developing the premix to obtain the modified asphalt.

[0023] According to an embodiment of the present invention, in step S1), the swelling temperature is 175-185°C, exemplified by 175°C, 176°C, 177°C, 178°C, 179°C, 180°C, 181°C, 182°C, 183°C, 184°C, and 185°C; the stirring speed during swelling is 200-1000 r / min, preferably 300-600 r / min; and the swelling time is 1-4 h, exemplified by 1 h, 2 h, 3 h, and 4 h.

[0024] According to an embodiment of the present invention, the ratio of the modifier in step S1) to the modifier in step S2) is 10:3-9, preferably 10:5-9, and exemplarily 10:5, 10:6, 10:7, 10:8, 10:9.

[0025] According to an embodiment of the present invention, in step S1), the premix may be ground, for example, using a colloid mill. The grinding temperature is 175-185°C, the feed rate is 25-50 g / s, preferably 20-40 g / s, and the grinding gap is 0.2-0.4 mm, for example, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, or 0.4 mm.

[0026] According to an embodiment of the present invention, in step S2), the heating temperature is 175-185°C, exemplified by 175°C, 176°C, 177°C, 178°C, 179°C, 180°C, 181°C, 182°C, 183°C, 184°C, and 185°C. The stirring speed during heating is 200-1000 r / min, preferably 500-800 r / min, and the heating time is 4-24 h, preferably 6-12 h.

[0027] According to an embodiment of the present invention, in step S2), after the heating is completed, the product may be subjected to a defoaming treatment, for example, by standing for defoaming, and the defoaming time is 20-40 minutes.

[0028] Beneficial effects of the present invention:

[0029] The present invention provides a method for preparing high-viscosity modified asphalt, which can not only improve the high and low temperature performance of the asphalt, but also enhance the viscosity, toughness and durability of the asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a flow chart of the preparation of the rubber-plastic alloy high-viscosity modified asphalt of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions of the present invention will be described in further detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are encompassed within the scope of protection that the present invention is intended to protect.

[0032] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0033] Example 1

[0034] The formula of high viscosity modified asphalt is as follows:

[0035] No. 70 asphalt (Ic = 0.18-0.3), from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0036] SBS modifier selected from Yueyang Petrochemical's linear 791H SBS, 8 parts by weight;

[0037] SBR modifier selected from Shandong Xianyuan granular SBR, 2 parts by weight;

[0038] C9 petroleum resin selected from Hengfeng Petrochemical, 7 parts by weight;

[0039] Aromatic oil, aromatic content> 80%, 6 parts by weight;

[0040] Stabilizer, selected from Runfeng Boyue HMD-2, 0.25 parts by weight;

[0041] The coupling agent is selected from siloxane coupling agent (KH2560), 0.3 parts by weight.

[0042] The preparation method of high viscosity modified asphalt is as follows:

[0043] S1) heating 100 parts of No. 70 asphalt to 175° C.-180° C., adding SBS and SBR modifiers, and stirring at 500 rpm for 1 hour to obtain a pre-swelling material;

[0044] S2) The pre-swelled material in S1) is ground at 180-185° C. with a feed pump feed rate of 30 g / s and a colloid mill grinding gap of 0.25 mm. The pre-swelled material is then transferred to a growth tank to obtain an intermediate material.

[0045] S3) C9 petroleum resin and aromatic oil are added to the development tank and stirred thoroughly, followed by the addition of stabilizer and coupling agent. After stirring for 6 hours at a temperature of 175-185°C and a rotation speed of 800 rpm, the product is transferred to an oven for defoaming and stabilization to obtain the finished product T1.

[0046] Example 2

[0047] The formula of high viscosity modified asphalt is as follows:

[0048] No. 70 asphalt (Ic = 0.18-0.3), from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0049] SBS modifier selected from Yueyang Petrochemical's linear 791H SBS, 7 parts by weight;

[0050] SBR modifier selected from Shandong Xianyuan granular SBR, 3 parts by weight;

[0051] LDPE resin selected from Yanshan Petrochemical extruded granules, 2 parts by weight;

[0052] C5 petroleum resin selected from Hengfeng Petrochemical, 4 parts by weight;

[0053] Aromatic oil, aromatic content> 80%, 6 parts by weight;

[0054] Stabilizer, selected from Runfeng Boyue HMD-2, 0.25 parts by weight;

[0055] The coupling agent is selected from siloxane coupling agent (KH2560), 0.3 parts by weight.

[0056] The preparation method of high viscosity modified asphalt is as follows:

[0057] S1) heating 100 parts of No. 70 asphalt to 180° C., adding modifiers SBS and SBR, and stirring at 500 rpm for 1 hour to obtain a pre-swelling material;

[0058] S2) The pre-swelled material in S1) is ground at 180-185° C. with a feed pump feed rate of 30 g / s and a colloid mill grinding gap of 0.25 mm. The pre-swelled material is then transferred to a growth tank to obtain an intermediate material.

[0059] S3) C5 petroleum resin, LDPE resin, and aromatic oil are added to a development tank and stirred thoroughly, followed by the addition of stabilizer and coupling agent. After stirring for 6 hours at a temperature of 175-185°C and a rotation speed of 800 rpm, the product is transferred to an oven for defoaming and stabilization to obtain finished product T2.

[0060] Example 3

[0061] No. 70 asphalt (Ic = 0.18-0.3), from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0062] SBS modifier selected from Yueyang Petrochemical's linear 791H SBS, 4 parts by weight;

[0063] SEBS modifier selected from linear YH688 SBES of Yueyang Petrochemical, 3 parts by weight;

[0064] SBR modifier selected from Shandong Xianyuan granular SBR, 3 parts by weight;

[0065] C9 petroleum resin selected from Hengfeng Petrochemical, 7 parts by weight;

[0066] Aromatic oil, aromatic content> 80%, 5 parts by weight;

[0067] Stabilizer, selected from Runfeng Boyue HMD-2, 0.25 parts by weight;

[0068] The coupling agent is selected from siloxane coupling agent (KH2560), 0.3 parts by weight.

[0069] The preparation method of high viscosity modified asphalt is as follows:

[0070] S1) heating 100 parts of No. 70 asphalt to 180° C., adding modifiers SBS, SBR, and SEBS, and stirring at 500 rpm for 1 hour to obtain a pre-swelling material;

[0071] S2) The pre-swelled material in S1) is ground at 180-185° C. with a feed pump feed rate of 30 g / s and a colloid mill grinding gap of 0.25 mm. The pre-swelled material is then transferred to a growth tank to obtain an intermediate material.

[0072] S3) C9 petroleum resin and aromatic oil are added to the development tank and stirred thoroughly, followed by the addition of stabilizer and coupling agent. After stirring for 6 hours at a temperature of 175-185°C and a rotation speed of 800 rpm, the product is transferred to an oven for defoaming and stabilization to obtain the finished product T4.

[0073] Comparative Example 1

[0074] No. 70 asphalt (Ic = 0.18-0.3), from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0075] SBS modifier selected from Yueyang Petrochemical's linear 791H SBS, 10 parts by weight;

[0076] Aromatic oil, aromatic content> 80%, 4 parts by weight;

[0077] Stabilizer, selected from Runfeng Boyue HMD-2, 0.25 parts by weight;

[0078] The preparation method of high viscosity modified asphalt is as follows:

[0079] S1) heating 100 parts of No. 70 asphalt to 180° C., adding a modifier SBS, and stirring at 500 rpm for 1 hour to obtain a pre-swelling material;

[0080] S2) The pre-swelled material in S1) is ground at 180-185° C. with a feed pump feed rate of 30 g / s and a colloid mill grinding gap of 0.25 mm. The pre-swelled material is then transferred to a growth tank to obtain an intermediate material.

[0081] S3) Aromatic oil is added to the development tank and stirred until uniform, followed by the addition of stabilizer and coupling agent. After stirring for 6 hours at a temperature of 175-185°C and a rotation speed of 800 rpm, the product is transferred to an oven for defoaming and stabilization to obtain the finished product C1.

[0082] Comparative Example 2

[0083] The formula of high viscosity modified asphalt is as follows:

[0084] No. 70 asphalt (Ic>0.45); 100 parts by weight

[0085] SBS modifier selected from Yueyang Petrochemical's linear 791H SBS, 8 parts by weight;

[0086] SBR modifier selected from Shandong Xianyuan granular SBR, 2 parts by weight;

[0087] C9 petroleum resin selected from Hengfeng Petrochemical, 7 parts by weight;

[0088] Aromatic oil, aromatic content> 80%, 6 parts by weight;

[0089] Stabilizer, selected from Runfeng Boyue HMD-2, 0.25 parts by weight;

[0090] The coupling agent is selected from siloxane coupling agent (KH2560), 0.3 parts by weight.

[0091] The preparation method of high-viscosity modified asphalt is the same as that in Example 1, and the finished product C2 is obtained.

[0092] Table 1: Product index detection methods in Examples 1-3 and Comparative Examples 1-3

[0093] Table 2 Performance test results of the products in Examples 1-3 and Comparative Examples 1-3

[0094] As can be seen from Table 2, within the scope of the present invention, by regulating the combination range of rubber and resin modifiers and controlling the Ic range of the base asphalt, the obtained high-viscosity modified asphalt has a higher viscosity and exhibits excellent performance at high and low temperatures.

[0095] The above is an exemplary description of the embodiments of the present invention. However, the scope of protection of the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A rubber-plastic alloy high-viscosity modified asphalt, characterized in that: Its raw materials include:

2. The modified asphalt according to claim 1, characterized in that The modified asphalt comprises:

3. The modified asphalt according to claim 1, characterized in that The colloid instability index Ic of the base asphalt is in the range of 0.1-0.

5.

4. The modified asphalt according to claim 1, characterized in that The modifier includes a rubber modifier, a resin modifier, and a plastic modifier; The rubber modifier is selected from one or more combinations of SBS, SEBS, SIS, SBR, and activated rubber powder; The resin modifier is selected from one or a combination of C5 petroleum resin and C9 petroleum resin; The plastic modifier is selected from LDPE resin, HDPE resin or a combination of both.

5. The modified asphalt according to claim 1, characterized in that: The cosolvent comprises one of aromatic oil, furfural extracted oil, and vacuum wax oil plant extender; The stabilizer is selected from Runfeng Boyue stabilizer; The coupling agent is selected from siloxane coupling agents.

6. The method for preparing modified asphalt according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1) mixing the base asphalt with part of the modifier, swelling, and obtaining a premix; S2) heating and mixing the premix, modifier, cosolvent, stabilizer and coupling agent, and developing the premix to obtain the modified asphalt.

7. The method according to claim 6, characterized in that In step S1), the swelling temperature is 175-185° C., the stirring speed during swelling is 200-1000 r / min, and the swelling time is 1-4 h.

8. The method according to claim 6, characterized in that The ratio of the modifier in step S1) to the modifier in step S2) is 10:3-9.

9. The method according to claim 6, characterized in that In step S2), the heating temperature is 175-185° C., the stirring speed during heating is 200-1000 r / min, and the heating time is 4-24 h.

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