Special composite modified asphalt for cold patch material and preparation method of special composite modified asphalt

Abstract

The invention discloses special composite modified asphalt for a cold patch material and a preparation method of the special composite modified asphalt. The special composite modified asphalt for the cold patch material comprises the following raw material components: 70-85 parts of SBS (Styrene Butadiene Styrene) modified asphalt; 10-20 parts of epoxy resin; 3-8 parts of a water-triggered curing agent; 1-3 parts of a compatibilizer; 2-5 parts of anti-flying powder; and 5-10 parts of a mineral filler. The epoxy resin, the water-triggered curing agent, the compatibilizer, the anti-flying agent, the mineral filler and the SBS modified asphalt in the special composite modified asphalt for the cold patch material have a synergistic effect, so that the special composite modified asphalt for the cold patch material is quick to cure, low in construction temperature, high in storage stability and high in initial strength. The special composite modified asphalt for the cold patch material is stable under a dry condition, rapidly releases active groups after meeting water to trigger crosslinking of epoxy resin, and has the characteristics of long storage period and rapid curing.

Description

Technical Field

[0001] This invention relates to the technical field of modified asphalt preparation, and more particularly to a composite modified asphalt for cold patching and its preparation method. Background Technology

[0002] Asphalt pavements are prone to cracking and potholes due to temperature changes, vehicle loads, and water damage over long-term use. Therefore, efficient and reliable repair materials are needed to extend their service life. Currently, traditional hot-mix asphalt mixtures and emulsified asphalt cold patching are commonly used repair solutions, but each has significant drawbacks. Hot-mix asphalt mixtures require high-temperature mixing (160-180℃) for both mixing and application, resulting in high energy consumption and seasonal limitations, especially in winter when application is difficult. Furthermore, long cooling times are required after repair before traffic can resume, severely impacting road efficiency. While emulsified asphalt cold patching can be applied at room temperature, its curing speed is extremely slow, its initial strength is low, it is easily damaged by vehicle traffic, and its storage stability is poor, prone to demulsification or clumping, affecting its workability.

[0003] To improve the performance of cold patch materials, numerous researchers have explored various modification techniques, such as SBS modification, epoxy resin reinforcement, and chemical curing, but many challenges remain. Among these, the conflict between storage stability and curing speed is particularly prominent. Ordinary epoxy resin-modified asphalt requires high-temperature curing, failing to meet the requirements of cold application, while room-temperature curing systems (such as amine curing agents) are prone to premature reactions during storage, leading to material failure. Furthermore, SBS-modified asphalt has poor compatibility with epoxy resin, and long-term storage easily leads to phase separation, affecting mechanical properties. Traditional cold patch materials rely on solvent evaporation or emulsified asphalt demulsification for curing, typically resulting in low initial strength, making it difficult to meet the demands of rapid traffic reopening.

[0004] Therefore, there is an urgent need to develop a special composite modified asphalt for cold patching that has fast curing, low construction temperature, high storage stability, and high initial strength to meet the high-standard repair needs of modern roads. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of ordinary modified asphalt, the present invention provides a special composite modified asphalt for cold patching and its preparation method. The special composite modified asphalt for cold patching has fast curing, low construction temperature, high storage stability and high initial strength.

[0006] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: A composite modified asphalt for cold patching, wherein the raw materials of the composite modified asphalt for cold patching include the following components: 70-85 parts SBS modified asphalt; 10-20 parts epoxy resin; 3-8 parts water-triggered curing agent; 1-3 parts compatibilizer; 2-5 parts anti-scattering agent; and 5-10 parts mineral filler.

[0007] According to one aspect of the present invention, the preferred composition of the cold patching special composite modified asphalt is: 75-80 parts SBS modified asphalt; 14-18 parts epoxy resin; 4-7 parts water-triggered curing agent; 2 parts compatibilizer; 3-4 parts anti-scattering agent; and 6-9 parts mineral filler.

[0008] According to one aspect of the present invention, the composition of the cold patching special composite modified asphalt is more preferably: 80 parts SBS modified asphalt; 15 parts epoxy resin; 5 parts water-triggered curing agent; 2 parts compatibilizer; 3 parts anti-scattering agent; and 8 parts mineral filler.

[0009] Alternatively, according to one aspect of the present invention, the composition of the cold patching special composite modified asphalt is more preferably: 80 parts SBS modified asphalt; 20 parts epoxy resin; 7 parts water-triggered curing agent; 3 parts compatibilizer; 3 parts anti-scattering agent; and 8 parts mineral filler.

[0010] According to one aspect of the present invention, the SBS modified asphalt is produced by Shanghai Chengjian Rili Special Asphalt Co., Ltd., and the method for producing the SBS modified asphalt is as follows: (1) 93.88% of the base asphalt is heated to 150-160°C; after adding 1.5% compatibilizer, low-speed stirring is started at a stirring speed of 800-1000 rpm for 35 min; (2) Subsequently, 4.5% of SBS modifier is gradually added, and high-speed shearing is started at a shearing rate of 5000-6000 rpm for 1.5-2 h, and the temperature is maintained at 175-180°C; (3) after replacing the high-speed stirring equipment, 0.12% stabilizer is added, and stirring is continued for 2-3 h at a stirring speed of 900-1000 rpm, and the temperature is maintained at 165-170°C; thus, the SBS modified asphalt is obtained, and the SBS modified asphalt meets the technical indicators shown in Table 1 below: Table 1

[0011] According to one aspect of the present invention, the epoxy resin main resin is preferably E-51, for example, bisphenol A type liquid epoxy resin E-51 commercially available from Greenlink (Jining) Chemical Technology Co., Ltd.

[0012] According to one aspect of the invention, the epoxy resin modified resin is preferably GE-36, for example, ERISYS® GE36 commercially available from Vivo.

[0013] According to one aspect of the invention, the water-triggered curing agent is preferably a ketimine, which is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane, wherein the ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane in a molar ratio of 2:1 in a water bath at room temperature.

[0014] According to one aspect of the invention, the compatibilizer is preferably maleic anhydride-grafted SBS, such as SEBS commercially available from KOAS Chemical Co., Ltd.

[0015] According to one aspect of the invention, the anti-scattering agent is preferably a polyurethane prepolymer, such as a polyester type commercially available from Jiangsu Qianmeite Polyurethane New Materials Co., Ltd.

[0016] According to one aspect of the invention, the mineral filler is preferably limestone powder, for example, limestone powder commercially available from Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0017] A method for preparing a composite modified asphalt for cold patching, comprising the following steps: heating SBS modified asphalt to 160-170℃, adding compatibilizer, and shearing and stirring for 30 minutes; cooling to below 120℃, adding epoxy resin, and mixing at low speed for 10 minutes; premixing water-triggered curing agent, anti-scattering agent, and mineral filler at room temperature to form a solid additive package; mixing the composite modified asphalt and premixed additive at 60-80℃, cooling, and packaging; and spraying a small amount of water after paving the mixture.

[0018] According to one aspect of the present invention, the preferred steps of the preparation method of the composite modified asphalt for cold patching are as follows: heating SBS modified asphalt to 165°C, adding compatibilizer, and shearing and stirring for 30 min; cooling to 100°C, adding epoxy resin, and mixing at low speed for 10 min; premixing water-triggered curing agent, anti-scattering agent, and mineral filler at room temperature to form a solid additive package; mixing the composite modified asphalt and premixed additive at 70°C, cooling, and packaging; and spraying a small amount of water after spreading the mixture.

[0019] The advantages of this invention are as follows: Compared to using only cationic emulsified asphalt, although the construction temperature is lower, the presence of water, emulsifiers, and other components, as well as the lower asphalt content, results in poor strength and stability of the asphalt. This application, by using SBS-modified asphalt, allows the epoxy resin, water-triggered curing agent, compatibilizer, anti-scattering agent, mineral filler, and SBS-modified asphalt in the cold patch composite modified asphalt to work synergistically, resulting in rapid curing, low construction temperature, high storage stability, and high initial strength. The cold patch composite modified asphalt is stable under dry conditions and rapidly releases active groups upon contact with water, triggering epoxy resin crosslinking, thus possessing both long shelf life and rapid curing characteristics. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1

[0022] Heat 80 parts of SBS modified asphalt to 165℃, add 2 parts of maleic anhydride-grafted SBS compatibilizer, and shear and stir for 30 minutes; cool to 100℃, add 15 parts of E-51 and 5 parts of GE-36, and mix at low speed for 10 minutes; premix 5 parts of water-triggered curing agent, 3 parts of polyurethane prepolymer, and 8 parts of limestone powder at room temperature to form a solid additive package; mix the composite modified asphalt with the solid additive package at 70℃, cool, and then package.

[0023] The SBS modified asphalt was produced by Shanghai Chengjian Rili Special Asphalt Co., Ltd. The preparation method of the SBS modified asphalt is as follows: (1) Heat 93.88% of the base asphalt to 150-160℃; add 1.5% compatibilizer and start low-speed stirring at 800-1000 rpm for 35 min; (2) Subsequently, gradually add 4.5% SBS modifier and start high-speed shearing at 5000-6000 rpm for 1.5-2 h, and maintain the temperature at 175-180℃. (3) After replacing the high-speed stirring equipment, add 0.12% stabilizer and continue stirring for 2-3 h at 900-1000 rpm, and maintain the temperature at 165-170℃; the SBS modified asphalt is obtained, and the SBS modified asphalt meets the technical indicators shown in Table 1. The compatibilizer, maleic anhydride-grafted SBS, is SEBS from KOAS Chemical Co., Ltd. The epoxy resin main resin E-51 is bisphenol A type liquid epoxy resin E-51 produced by Greenlink (Jining) Chemical Technology Co., Ltd. The epoxy resin modified resin GE-36 is ERISYS® GE36 produced by Vivo. The water-triggered curing agent ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane. The ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane in a molar ratio of 2:1 in a water bath at room temperature. The anti-scattering agent is a polyurethane prepolymer, specifically a polyester type produced by Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. The limestone powder was produced by Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0024] Example 2

[0025] Heat 80 parts of SBS modified asphalt to 165℃, add 2 parts of maleic anhydride-grafted SBS compatibilizer, and shear and stir for 30 minutes; cool to 100℃, add 20 parts of E-51, and mix at low speed for 10 minutes; premix 5 parts of water-triggered curing agent, 3 parts of polyurethane prepolymer, and 8 parts of limestone powder at room temperature to form a solid additive package; mix the composite modified asphalt with the solid additive package at 70℃, cool, and then package.

[0026] The SBS modified asphalt was produced by Shanghai Chengjian Rili Special Asphalt Co., Ltd. The preparation method of the SBS modified asphalt is as follows: (1) Heat 93.88% of the base asphalt to 150-160℃; add 1.5% compatibilizer and start low-speed stirring at 800-1000 rpm for 35 min; (2) Subsequently, gradually add 4.5% SBS modifier and start high-speed shearing at 5000-6000 rpm for 1.5-2 h, and maintain the temperature at 175-180℃. (3) After replacing the high-speed stirring equipment, add 0.12% stabilizer and continue stirring for 2-3 h at 900-1000 rpm, and maintain the temperature at 165-170℃; the SBS modified asphalt is obtained, and the SBS modified asphalt meets the technical indicators shown in Table 1. The compatibilizer, maleic anhydride-grafted SBS, is SEBS from KOAS Chemical Co., Ltd. The epoxy resin main resin E-51 is bisphenol A type liquid epoxy resin E-51 produced by Greenlink (Jining) Chemical Technology Co., Ltd. The water-triggered curing agent ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane. The ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane in a molar ratio of 2:1 in a water bath at room temperature. The anti-scattering agent is a polyurethane prepolymer, specifically a polyester type produced by Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. The limestone powder was produced by Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0027] Example 3

[0028] Heat 80 parts of SBS modified asphalt to 165℃ and shear and stir for 30 minutes; cool to 100℃, add 15 parts of E-51 and 5 parts of GE-36, and mix at low speed for 10 minutes; premix 5 parts of water-triggered curing agent ketimine, 3 parts of polyurethane prepolymer, and 8 parts of limestone powder at room temperature to form a solid additive package; mix the composite modified asphalt with the solid additive package at 70℃, cool, and then package.

[0029] The SBS modified asphalt was produced by Shanghai Chengjian Rili Special Asphalt Co., Ltd. The preparation method of the SBS modified asphalt is as follows: (1) Heat 93.88% of the base asphalt to 150-160℃; add 1.5% compatibilizer and start low-speed stirring at 800-1000 rpm for 35 min; (2) Subsequently, gradually add 4.5% SBS modifier and start high-speed shearing at 5000-6000 rpm for 1.5-2 h, and maintain the temperature at 175-180℃. (3) After replacing the high-speed stirring equipment, add 0.12% stabilizer and continue stirring for 2-3 h at 900-1000 rpm, and maintain the temperature at 165-170℃; the SBS modified asphalt is obtained, and the SBS modified asphalt meets the technical indicators shown in Table 1. The epoxy resin main resin E-51 is bisphenol A type liquid epoxy resin E-51 produced by Greenlink (Jining) Chemical Technology Co., Ltd. The epoxy resin modified resin GE-36 is ERISYS® GE36 produced by Vivo. The water-triggered curing agent ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane. The ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane in a molar ratio of 2:1 in a water bath at room temperature. The anti-scattering agent is a polyurethane prepolymer, specifically a polyester type produced by Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. The limestone powder was produced by Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0030] Example 4

[0031] Heat 80 parts of SBS modified asphalt to 165℃, add 2 parts of maleic anhydride-grafted SBS compatibilizer, and shear and stir for 30 minutes; cool to 100℃, add 15 parts of E-51 and 5 parts of GE-36, and mix at low speed for 10 minutes; premix 5 parts of water-triggered curing agent modified ketimide, 3 parts of polyurethane prepolymer, and 8 parts of limestone powder at room temperature to form a solid additive package; mix the composite modified asphalt with the solid additive package at 70℃, cool, and then package.

[0032] The SBS modified asphalt was produced by Shanghai Chengjian Rili Special Asphalt Co., Ltd. The preparation method of the SBS modified asphalt is as follows: (1) Heat 93.88% of the base asphalt to 150-160℃; add 1.5% compatibilizer and start low-speed stirring at 800-1000 rpm for 35 min; (2) Subsequently, gradually add 4.5% SBS modifier and start high-speed shearing at 5000-6000 rpm for 1.5-2 h, and maintain the temperature at 175-180℃. (3) After replacing the high-speed stirring equipment, add 0.12% stabilizer and continue stirring for 2-3 h at 900-1000 rpm, and maintain the temperature at 165-170℃; the SBS modified asphalt is obtained, and the SBS modified asphalt meets the technical indicators shown in Table 1. The compatibilizer, maleic anhydride-grafted SBS, is SEBS from KOAS Chemical Co., Ltd. The epoxy resin main resin E-51 is bisphenol A type liquid epoxy resin E-51 produced by Greenlink (Jining) Chemical Technology Co., Ltd. The epoxy resin modified resin GE-36 is ERISYS® GE36 produced by Vivo. The water-triggered curing agent modified ketimine is prepared by reacting methyl isobutyl ketone with ethylenediamine. The modified ketimine is prepared by reacting methyl isobutyl ketone with ethylenediamine in a molar ratio of 2:1 in a water bath at room temperature. The anti-scattering agent is a polyurethane prepolymer, specifically a polyester type produced by Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. The limestone powder was produced by Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0033] Example 5 Heat 80 parts of SBS modified asphalt to 165℃, add 2 parts of maleic anhydride-grafted SBS compatibilizer, and shear and stir for 30 minutes; cool to 100℃, add 15 parts of E-51 and 5 parts of GE-36, and mix at low speed for 10 minutes; premix 5 parts of water-triggered curing agent, 3 parts of polyurethane prepolymer, and 8 parts of limestone powder at room temperature to form a solid additive package; mix the composite modified asphalt with the solid additive package at 70℃, cool, and then package.

[0034] Among them, the SBS modified asphalt was produced by Jiangsu Tiannuo Road Materials Co., Ltd. The compatibilizer, maleic anhydride-grafted SBS, is SEBS from KOAS Chemical Co., Ltd. The epoxy resin main resin E-51 is bisphenol A type liquid epoxy resin E-51 produced by Greenlink (Jining) Chemical Technology Co., Ltd. The epoxy resin modified resin GE-36 is ERISYS® GE36 produced by Vivo. The water-triggered curing agent ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane. The ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane in a molar ratio of 2:1 in a water bath at room temperature. The anti-scattering agent is a polyurethane prepolymer, specifically a polyester type produced by Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. The limestone powder was produced by Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0035] Example 6

[0036] Heat 80 parts of SBS modified asphalt to 165℃, add 2 parts of maleic anhydride-grafted SBS compatibilizer, and shear and stir for 30 minutes; cool to 100℃, add 15 parts of E-51 and 5 parts of GE-36, and mix at low speed for 10 minutes; premix 5 parts of water-triggered curing agent, 3 parts of polyurethane prepolymer, and 8 parts of limestone powder at room temperature to form a solid additive package; mix the composite modified asphalt with the solid additive package at 70℃, cool, and then package.

[0037] The SBS modified asphalt was produced by Shanghai Chengjian Rili Special Asphalt Co., Ltd. The preparation method of the SBS modified asphalt is as follows: (1) Heat 93.88% of the base asphalt to 150-160℃; add 1.5% compatibilizer and start low-speed stirring at 800-1000 rpm for 35 min; (2) Subsequently, gradually add 4.5% SBS modifier and start high-speed shearing at 5000-6000 rpm for 1.5-2 h, and maintain the temperature at 175-180℃. (3) After replacing the high-speed stirring equipment, add 0.12% stabilizer and continue stirring for 2-3 h at 900-1000 rpm, and maintain the temperature at 165-170℃; the SBS modified asphalt is obtained, and the SBS modified asphalt meets the technical indicators shown in Table 1. The compatibilizer, maleic anhydride-grafted SBS, is SEBS from KOAS Chemical Co., Ltd. The epoxy resin is a high-temperature type produced by Jiangsu Zhonglu Engineering Technology Research Institute Co., Ltd. The water-triggered curing agent ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane. The ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane in a molar ratio of 2:1 in a water bath at room temperature. The anti-scattering agent is a polyurethane prepolymer, specifically a polyester type produced by Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. The limestone powder was produced by Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0038] Comparative Example 1 Heat 80 parts of cationic emulsified asphalt to 165℃, add 2 parts of compatibilizer maleic anhydride-grafted SBS, and shear and stir for 30 min; cool to 100℃, add 15 parts of E-51 and 5 parts of GE-36, and mix at low speed for 10 min; premix 5 parts of water-triggered curing agent ketimide, 3 parts of polyurethane prepolymer, and 8 parts of limestone powder at room temperature to form a solid additive package; mix the composite modified asphalt with the solid additive package at 70℃, cool, and then package.

[0039] Among them, the cationic emulsified asphalt is produced by Shanghai Chengjian Rili Special Asphalt Co., Ltd., and the parameters of the cationic emulsified asphalt are shown in Table 2 below. Table 2 The compatibilizer, maleic anhydride-grafted SBS, is SEBS from KOAS Chemical Co., Ltd. The epoxy resin main resin E-51 is bisphenol A type liquid epoxy resin E-51 produced by Greenlink (Jining) Chemical Technology Co., Ltd. The epoxy resin modified resin GE-36 is ERISYS® GE36 produced by Vivo. The water-triggered curing agent ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane. The ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane in a molar ratio of 2:1 in a water bath at room temperature. The anti-scattering agent is a polyurethane prepolymer, specifically a polyester type produced by Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. The limestone powder was produced by Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0040] Comparative Example 2 Heat 80 parts of SBS modified asphalt to 165℃, add 2 parts of maleic anhydride-grafted SBS compatibilizer, and shear and stir for 30 minutes; cool to 100℃ and mix at low speed for 10 minutes; premix 5 parts of water-triggered curing agent ketimide, 3 parts of polyurethane prepolymer, and 8 parts of limestone powder at room temperature to form a solid additive package; mix the composite modified asphalt with the solid additive package at 70℃, cool, and then package.

[0041] The SBS modified asphalt was produced by Shanghai Chengjian Rili Special Asphalt Co., Ltd. The preparation method of the SBS modified asphalt is as follows: (1) Heat 93.88% of the base asphalt to 150-160℃; add 1.5% compatibilizer and start low-speed stirring at 800-1000 rpm for 35 min; (2) Subsequently, gradually add 4.5% SBS modifier and start high-speed shearing at 5000-6000 rpm for 1.5-2 h, and maintain the temperature at 175-180℃. (3) After replacing the high-speed stirring equipment, add 0.12% stabilizer and continue stirring for 2-3 h at 900-1000 rpm, and maintain the temperature at 165-170℃; the SBS modified asphalt is obtained, and the SBS modified asphalt meets the technical indicators shown in Table 1. The compatibilizer, maleic anhydride-grafted SBS, is SEBS from KOAS Chemical Co., Ltd. The water-triggered curing agent ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane. The ketimine is prepared by reacting methyl isobutyl ketone with 1,3-di(aminomethyl)cyclohexane in a molar ratio of 2:1 in a water bath at room temperature. The anti-scattering agent is a polyurethane prepolymer, specifically a polyester type produced by Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. The limestone powder was produced by Hebei Jurui Rubber & Plastics Technology Co., Ltd.

[0042] Implementation results:

[0043] The performance comparisons of each embodiment and the comparative example are shown in Table 3.

[0044] Table 3 As can be seen from Table 3: (1) The cold patch material-specific composite modified asphalt in Examples 1-6 has high Marshall stability, low scattering rate, and enhanced compressive strength, indicating that the cold patch material-specific composite modified asphalt of the present invention has high initial strength. The cold patching-specific composite modified asphalt in Examples 1 and 2 exhibits high compressive strength; The cold patching-specific composite modified asphalt in Examples 1, 4, and 5 has a short initial setting time and a short final setting time, indicating that the cold patching-specific composite modified asphalt of the present invention cures quickly. Examples 2, 4, and 5 show that the cold patching-specific composite modified asphalt has high Marshall stability and low scattering rate; The low scattering rate of the cold patching-specific composite modified asphalt in Examples 3, 4, and 6 indicates that the cold patching-specific composite modified asphalt of the present invention is stable and not easily scattered.

[0045] (2) Comparative Example 1 uses cationic emulsified asphalt instead of SBS modified asphalt. Its initial setting time and final setting time are much higher than those of Examples 1, 3, 4 and 5. Its Marshall strength and compressive strength are much lower than those of Examples 1-6. Its scattering rate is higher than that of Examples 1-6. It can be seen that its stability, durability and compressive strength are not as good as those of Examples 1-6.

[0046] (3) Comparative Example 2 did not add epoxy resin to the main resin and modified resin. Its Marshall stability and compressive strength were lower than those of Examples 1-6, and its scattering rate was higher than that of Examples 1-6. It can be seen that its stability and strength were not as good as those of Examples 1-6.

[0047] In summary, the performance data in Table 3 show that the cold patching-specific composite modified asphalt of Examples 1-6 has better effects and excellent overall performance.

[0048] The advantages of this invention are as follows: Compared to using only cationic emulsified asphalt, although the construction temperature is lower, the presence of water, emulsifiers, and other components, as well as the lower asphalt content, results in poor strength and stability of the asphalt. This application, by using SBS-modified asphalt, allows the epoxy resin, water-triggered curing agent, compatibilizer, anti-scattering agent, mineral filler, and SBS-modified asphalt in the cold patch composite modified asphalt to work synergistically, resulting in rapid curing, low construction temperature, high storage stability, and high initial strength. The cold patch composite modified asphalt is stable under dry conditions and rapidly releases active groups upon contact with water, triggering epoxy resin crosslinking, thus possessing both long shelf life and rapid curing characteristics.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A composite modified asphalt specifically for cold patching, characterized in that, The raw materials for the cold patching-specific composite modified asphalt include the following components: 70-85 parts SBS modified bitumen; 10-20 parts epoxy resin; 3-8 parts water-triggered curing agent; 1-3 parts compatibilizer; 2-5 parts anti-spray agent; 5-10 parts mineral filler.

2. The composite modified asphalt for cold patching as described in claim 1, characterized in that, The raw materials for the cold patching special composite modified asphalt include the following components: 75-80 parts SBS modified asphalt; 14-18 parts epoxy resin; 4-7 parts water-triggered curing agent; 2-3 parts compatibilizer; 3-4 parts anti-scattering agent; and 6-9 parts mineral filler.

3. The composite modified asphalt for cold patching as described in claim 1, characterized in that, The raw materials for the cold patching special composite modified asphalt include the following components: 80 parts SBS modified asphalt; 15 parts epoxy resin; 5 parts water-triggered curing agent; 2 parts compatibilizer; 3 parts anti-scattering agent; 8 parts mineral filler; Alternatively, 80 parts SBS modified bitumen; 20 parts epoxy resin; 7 parts water-triggered curing agent; 3 parts compatibilizer; 3 parts anti-scattering agent; 8 parts mineral filler.

4. The composite modified asphalt for cold patching as described in claim 1, characterized in that, The cold patching-specific composite modified asphalt meets one or both of the following conditions a and b: a. The epoxy resin includes a main resin and a modified resin; b. The water-triggered curing agent is a latent curing agent.

5. The composite modified asphalt for cold patching as described in claim 4, characterized in that, The epoxy resin main resin is E-51, and the modified resin is GE-36.

6. The composite modified asphalt for cold patching as described in claim 4, characterized in that, The water-triggered curing agent is a ketimine or a modified ketimine.

7. The composite modified asphalt for cold patching as described in claim 6, characterized in that, The ketoimine is prepared by reacting methyl isobutyl ketone with 1,3-bis(aminomethyl)cyclohexane.

8. The composite modified asphalt for cold patching as described in claim 1, characterized in that, The compatibilizer is maleic anhydride-grafted SBS.

9. The composite modified asphalt for cold patching as described in claim 1, characterized in that, The anti-scattering agent is a polyurethane prepolymer.

10. The composite modified asphalt for cold patching as described in claim 1, characterized in that, The mineral filler is limestone powder.

11. A method for preparing a composite modified asphalt specifically for cold patching, characterized in that, The process includes the following steps: heating SBS modified asphalt, adding compatibilizer, and shearing and stirring; cooling, adding epoxy resin, and mixing at low speed; premixing water-triggered curing agent, anti-scattering agent, and mineral filler at room temperature to form a solid additive package; mixing the composite modified asphalt with the premixed additive, cooling, and then packaging.

12. The method for preparing composite modified asphalt for cold patching as described in claim 11, characterized in that, The preparation method of the composite modified asphalt for cold patching includes the following steps: heating SBS modified asphalt to 165°C, adding compatibilizer, and shearing and stirring for 30 minutes; cooling to 100°C, adding epoxy resin, and mixing at low speed for 10 minutes; premixing water-triggered curing agent, anti-scattering agent, and mineral filler at room temperature to form a solid additive package; mixing the composite modified asphalt and premixed additive at 70°C, cooling, and then packaging.

Images