Composite toughened modified cold-mixed epoxy asphalt and preparation method thereof

Abstract

The invention relates to the technical field of road paving materials, in particular to composite toughened modified cold-mixed epoxy asphalt and a preparation method thereof. The composite toughened modified cold-mixed epoxy asphalt is obtained by mixing a first component and a second component at room temperature, the first component is obtained by stirring and mixing the following raw materials in parts by weight at 40-60 DEG C: 100 parts of epoxy resin, 10-30 parts of an epoxy resin diluent, 10-20 parts of carboxyl-terminated nitrile rubber and 5-15 parts of polyurethane; and the second component is obtained by heating and stirring the matrix asphalt and the asphalt diluent at 110-135 DEG C until the matrix asphalt and the asphalt diluent are dissolved, then cooling to below 40 DEG C, adding the curing agent and the compatibilizer, and continuously stirring until the materials are uniformly mixed. According to the invention, the problem of poor toughness of the cold-mixed epoxy asphalt is solved mainly by improving the mixing mode and carrying out composite toughening modification on the cold-mixed epoxy asphalt by using the carboxyl-terminated nitrile rubber and the polyurethane.

Description

Technical Field

[0001] The invention relates to the technical field of road paving materials, and in particular to a composite toughened modified cold-mix epoxy asphalt and a preparation method thereof. Background Art

[0002] In road construction, the selection and application of road paving materials are directly related to the service life of the road and driving safety. Traditional hot-mix epoxy asphalt, as a high-performance pavement material, is widely used in highway and other pavement paving due to its excellent mechanical properties and durability. However, the mixing temperature of hot-mix epoxy asphalt is generally between 120℃ and 180℃. For example, the medium-temperature mixing epoxy asphalt produced by Chem Co Systems in the United States has a mixing temperature of 120℃; the TAF high-temperature mixing epoxy asphalt produced by Daiyou Construction Co., Ltd. in Japan has a mixing temperature of 180℃; the mixing temperature of domestic epoxy asphalt is 160-180℃, which not only requires the establishment of a large mixing station, but also leads to high energy consumption. At the same time, during the paving application process, hot-mix epoxy asphalt will also be unable to be used normally due to poor mixing temperature control or sudden weather changes such as rain and snowfall; coupled with unqualified pavement resulting in re-paving.

[0003] Based on this, people proposed cold-mix epoxy asphalt. Its core advantage is that through special solvent-gel reaction dispersion technology and epoxy resin cross-linking curing reaction technology, the production and paving of cold-mix epoxy asphalt can be realized at room temperature. It fundamentally overcomes the problem that traditional hot-mix epoxy asphalt needs to be mixed at high temperatures of 150-180°C, greatly reduces the energy consumption of materials, simplifies the construction difficulty, and realizes energy-saving and green paving.

[0004] In particular, cold-mix epoxy asphalt can be stirred and used at room temperature, without the need for heating and heat preservation during transportation. Therefore, when it is used for paving, there is enough time to carry out corresponding technical processing for changes in climatic conditions during paving and storage of raw materials. Moreover, even if the paved road surface is unqualified due to lax control of the paving process, the paved cold-mix epoxy asphalt materials can be immediately collected and paved again in a short time. Therefore, the overall utilization rate of cold-mix epoxy asphalt materials is relatively high. In addition, cold-mix epoxy asphalt materials, with their excellent pavement applicability, can fully meet the current highway application requirements for pavement paving materials, especially in terms of low-cost paving materials for high-grade highway pavements suitable for high-cold climates, heavy traffic, and overloaded areas.

[0005] At present, the cold-mixed epoxy asphalt studied is a flexible polymer obtained by uniformly dispersing petroleum asphalt microspheres on the resin network structure after the reaction and curing of components A and B. Component A is an epoxy asphalt resin formed by the reaction and modification of epoxy resin and petroleum asphalt, and component B is a room temperature curing fatty amine curing agent. However, the conventional cold-mixed epoxy asphalt currently has poor toughness due to the addition of a large amount of solvents. While polyurethane-modified epoxy asphalt can significantly improve the strength and toughness of the material, its room temperature cold mixing performance is insufficient and still needs to be heated during construction, which cannot meet the requirements of the cold mixing process.

[0006] Therefore, it is necessary to develop a composite toughened modified cold-mix epoxy asphalt material to meet the room temperature paving requirements of asphalt pavement and at the same time meet the performance indicators of asphalt pavement. Summary of the invention

[0007] In order to solve the problems of high room temperature viscosity and poor toughness after curing of existing cold-mix epoxy asphalt, the purpose of the present invention is to provide a composite toughened modified cold-mix epoxy asphalt and a preparation method thereof. The present invention utilizes the synergistic effect of multiple toughening agents to introduce flexible segments into the cross-linking system to improve the toughness of the material, enhance the mechanical properties and service life of the material, and reduce the room temperature viscosity of the material.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows.

[0009] The first aspect of the present invention provides a composite toughened modified cold-mixed epoxy asphalt, which is obtained by mixing a first component and a second component at room temperature; the first component is obtained by stirring and mixing the following raw materials in parts by weight at 40°C to 60°C: 100 parts of epoxy resin, 10 parts to 30 parts of epoxy resin diluent, 10 parts to 20 parts of terminal carboxyl nitrile rubber and 5 parts to 15 parts of polyurethane; the second component is obtained by heating and stirring a base asphalt and an asphalt diluent at 110°C to 135°C until dissolved, then cooling to below 40°C, adding a curing agent and a compatibilizer, and continuing to stir until uniformly mixed to obtain a second component; the weight ratio of the first component to the second component is 1:1.

[0010] The present invention utilizes the synergistic effect of multiple toughening agents to introduce flexible segments into the cross-linking system to improve the toughness of the material, enhance the mechanical properties and service life of the material, and reduce the viscosity of the material at room temperature.

[0011] The present invention mainly improves the mixing method and uses terminal carboxyl nitrile rubber and polyurethane to perform composite toughening modification on cold-mix epoxy asphalt. The material performance is improved by using the second phase toughening technology and the interpenetrating network polymer toughening technology. The prepared composite toughened modified cold-mix epoxy asphalt has the high strength characteristics of epoxy resin while improving its toughness and anti-aging performance, thereby increasing the durability of the epoxy asphalt material and solving the problems of high room temperature viscosity and poor toughness after curing in the existing cold-mix epoxy asphalt.

[0012] Preferably, the epoxy resin is bisphenol A epoxy resin, specifically E51 epoxy resin, with an epoxy value of 0.48 to 0.54 eq / 100g.

[0013] Preferably, the epoxy resin diluent is polypropylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, 2-glycidyl phenyl glycidyl ether, 2,6-diglycidyl phenyl glycidyl ether, C 12 ~C 14 At least one of alkyl glycidyl ether, benzyl glycidyl ether and decyl glycidyl ether.

[0014] Preferably, the polyurethane is a TDI type polyurethane prepolymer, wherein the TDI type polyurethane prepolymer is purchased from Shandong Aolilong Chemical Co., Ltd., with a purity of 98%.

[0015] Preferably, the carboxyl-terminated nitrile rubber has an acrylonitrile content of 33.9% and a molecular weight of 1000 to 4000. The carboxyl-terminated nitrile rubber is purchased from Shenzhen Masni Elastomer Co., Ltd., with an acrylonitrile content of 33.9%, a relative molecular weight of 1000 to 4000, and an intrinsic viscosity of 9.72 mL / g at 23°C.

[0016] Preferably, the second component is prepared by mixing the following raw materials in parts by weight:

[0017] 40 to 120 parts of base asphalt, 10 to 60 parts of asphalt diluent, 80 to 100 parts of curing agent and 10 to 30 parts of volume extender.

[0018] Preferably, the base asphalt is 70# base asphalt; the asphalt diluent is a mixture of any one or more of biodiesel, toluene, solvent oil, xylene, dichloropropane, trichloroethylene, tetrachloroethylene, dibutyl phthalate, and dioctyl phthalate; the curing agent is an amine curing agent; the compatibilizer is a mixture of any one or more of epoxy soybean oil, epoxy stearic acid, epoxy stearate, epoxy oleic acid, epoxy oleate, epoxy linoleic acid, epoxy linoleate and polyethylene oxide stearic acid.

[0019] Further preferably, the asphalt diluent is trichloroethylene, biodiesel or 200# solvent oil; the curing agent is polyamide 650; and the compatibilizer is epoxidized soybean oil.

[0020] A second aspect of the present invention is a method for preparing the composite toughened modified cold mix epoxy asphalt according to the first aspect, comprising the following steps:

[0021] The epoxy resin, epoxy resin diluent, carboxyl-terminated nitrile rubber and polyurethane are stirred and mixed uniformly at 40°C-60°C, and cooled to room temperature to obtain the first component; the base asphalt and asphalt diluent are heated and stirred at 110°C-135°C until dissolved, and then cooled to below 40°C, and a curing agent and a compatibilizer are added, and stirring is continued until uniformly mixed to obtain the second component; the first component and the second component are stirred and mixed at room temperature in a mass ratio of 1:1 to obtain a composite toughened modified cold-mix epoxy asphalt.

[0022] Preferably, the stirring speed is 200 r / min to 900 r / min.

[0023] Preferably, the specific preparation process of the composite toughened modified cold mix epoxy asphalt is:

[0024] The first component and the second component are stirred and mixed at room temperature in a mass ratio of 1:1, and then stirred at a speed of 500 r / min to 900 r / min for 3 to 5 minutes to obtain a composite toughened modified cold-mix epoxy asphalt.

[0025] Beneficial effects of the present invention:

[0026] 1. The present invention mainly improves the mixing method and uses terminal carboxyl nitrile rubber and polyurethane to perform composite toughening modification on cold-mix epoxy asphalt. The material performance is improved by using the second phase toughening technology and the interpenetrating network polymer toughening technology. The prepared composite toughened modified cold-mix epoxy asphalt has the high strength characteristics of epoxy resin while improving its toughness and anti-aging performance, increasing the durability of the epoxy asphalt material, and solving the problem of poor toughness of cold-mix epoxy asphalt.

[0027] 2. The composite toughened modified cold-mix epoxy asphalt of the present invention can not only solve the performance and application problems of cold-mix epoxy asphalt, but also make certain contributions to environmental protection. It simplifies the asphalt pavement paving process, reduces the asphalt pavement paving cost and energy consumption, improves the asphalt pavement paving quality, and prolongs the service life of the asphalt pavement, providing material selection and technical reference for the cold-mix epoxy asphalt paving technology of high-grade highways.

[0028] 3. The construction process of the present invention is simple, and an amine-based room-temperature epoxy curing agent is used, which can be mixed and constructed at room temperature, and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a fluorescence microscopic image of the composite toughened modified cold mix epoxy asphalt of Example 1 of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0032] At present, the cold-mixed epoxy asphalt studied is a flexible polymer obtained by uniformly dispersing petroleum asphalt microspheres on the resin network structure after the reaction and curing of components A and B. Component A is an epoxy asphalt resin formed by the reaction and modification of epoxy resin and petroleum asphalt, and component B is a room temperature curing fatty amine curing agent. However, the conventional cold-mixed epoxy asphalt currently has poor toughness due to the addition of a large amount of solvents. While polyurethane-modified epoxy asphalt can significantly improve the strength and toughness of the material, its room temperature cold mixing performance is insufficient and still needs to be heated during construction, which cannot meet the requirements of the cold mixing process.

[0033] The present invention utilizes the synergistic effect of multiple toughening agents to introduce flexible segments into the cross-linking system to improve the toughness of the material, enhance the mechanical properties and service life of the material, and reduce the viscosity of the material at room temperature.

[0034] The present invention mainly improves the mixing method and uses terminal carboxyl nitrile rubber and polyurethane to perform composite toughening modification on cold-mix epoxy asphalt. The material performance is improved by using the second phase toughening technology and the interpenetrating network polymer toughening technology. The prepared composite toughened modified cold-mix epoxy asphalt has the high strength characteristics of epoxy resin while improving its toughness and anti-aging performance, thereby increasing the durability of the epoxy asphalt material and solving the problems of high room temperature viscosity and poor toughness after curing in the existing cold-mix epoxy asphalt.

[0035] The present invention adopts carboxyl-terminated nitrile rubber and polyurethane to composite toughened epoxy asphalt, and on the basis of ensuring the strength of epoxy asphalt material, significantly improves the flexibility of epoxy asphalt material. The composite toughened modified cold-mixed epoxy asphalt of the present invention has a wide range of applications, not only suitable for paving waterproof bonding layers on steel bridge decks, but also can be used for bonding and waterproofing of urban viaducts, cement concrete bridge decks, tunnels, highways and other roads.

[0036] The technical solution of the present invention is further described below by means of specific examples. In the following examples, the methods described are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0037] In the following embodiments, the epoxy resin is a bisphenol A epoxy resin, specifically an E51 epoxy resin, purchased from Kunshan Jiulimei Electronic Materials Co., Ltd., with a density of 1.167 g / cm at 15°C. 3 , viscosity at 25°C is 7000-9000mPa·s, flash point is 280°C, epoxy value is 0.48-0.54eq / 100g, organic chlorine value is 0.02 equivalent / 100g, and water content is 0.02%.

[0038] The polypropylene glycol diglycidyl ether is from Zhangjiagang Yuanbang Chemical Materials Co., Ltd., with a viscosity of 25 to 90 mPa·s at 25° C. and an epoxy value of 0.34 eq / 100 g.

[0039] The carboxyl-terminated nitrile rubber was purchased from Shenzhen Masni Elastomer Co., Ltd., with an acrylonitrile content of 33.9%, a molecular weight of 1000-4000, and an intrinsic viscosity of 9.72 mL / g (23° C.).

[0040] The polyurethane, specifically a polyether polyurethane prepolymer, was purchased from Shandong Olilon Chemical Co., Ltd., with a molecular weight of 282.38 g / mol and a purity of 98%.

[0041] The base asphalt is 70# base asphalt, produced by Nantong Tongsha Asphalt Technology Co., Ltd.

[0042] Epoxidized soybean oil was purchased from Shandong Narmei New Materials Group Co., Ltd., with an epoxy value of 6.03, a flash point of 292, and a light yellow transparent liquid.

[0043] Polyamide 650, Changzhou Runxiang Electronic Technology Co., Ltd., active hydrogen equivalent 156g / eq.

[0044] Biodiesel, Guangzhou Fufei Chemical Technology Co., Ltd., density (25℃) 0.868g / cm 3 , content 99%.

[0045] 200# solvent oil, Guangdong Wentian Environmental Protection Cleaning Fluid Technology Co., Ltd., purity ≥99%.

[0046] Trichloroethylene was purchased from Shandong Yinglang Chemical Co., Ltd., analytical grade.

[0047] In the following embodiments of the present invention, the room temperature refers to 25°C±5°C.

[0048] Example 1

[0049] A method for preparing composite toughened modified cold mix epoxy asphalt comprises the following steps:

[0050] Step 1, preparation of the first component:

[0051] 100 g of epoxy resin, 30 g of polypropylene glycol diglycidyl ether, 10 g of carboxyl-terminated nitrile rubber, and 5 g of polyurethane were weighed and added into a reaction kettle, heated to 60° C., and stirred at a rate of 500 r / min for 60 min to obtain a first component.

[0052] Step 2, preparation of the second component:

[0053] Weigh 100g of base asphalt and 60g of trichloroethylene, add them into a common reactor, heat to 120°C, stir at a rate of 500r / min for 20min to completely dissolve the base asphalt, cool to below 40°C, add 20g of epoxy soybean oil and 100g of polyamide 650, stir at a rate of 500r / min until mixed evenly, and obtain the second component.

[0054] Step 3, preparation of composite toughened modified cold mix epoxy asphalt:

[0055] The first component and the second component were added into a reaction kettle and stirred at a rate of 500 r / min for 3 min at room temperature to obtain a composite toughened modified cold-mix epoxy asphalt.

[0056] Example 2

[0057] A method for preparing composite toughened modified cold mix epoxy asphalt comprises the following steps:

[0058] Step 1, preparation of the first component:

[0059] 100 g of epoxy resin, 25 g of polypropylene glycol diglycidyl ether, 10 g of carboxyl-terminated nitrile rubber, and 10 g of polyurethane were weighed and added into a reaction kettle. The mixture was heated to 60° C. and stirred at a rate of 400 r / min for 45 min to obtain a first component.

[0060] Step 2, preparation of the second component:

[0061] Weigh 80g of base asphalt and 50g of biodiesel, add them into a common reactor, heat to 120°C, stir at a rate of 400r / min for 10min to completely dissolve the base asphalt, cool to below 40°C, then add 10g of epoxidized soybean oil and 100g of polyamide 650, stir at a rate of 400r / min until mixed evenly, to obtain the second component.

[0062] Step 3, preparation of composite toughened modified cold mix epoxy asphalt:

[0063] The first component and the second component were added into a reaction kettle and stirred at a rate of 500 r / min for 3 min at room temperature to obtain a composite toughened modified cold-mix epoxy asphalt.

[0064] Example 3

[0065] A method for preparing composite toughened modified cold mix epoxy asphalt comprises the following steps:

[0066] Step 1, preparation of the first component:

[0067] 100 g of epoxy resin, 25 g of polypropylene glycol diglycidyl ether, 20 g of carboxyl-terminated nitrile rubber, and 10 g of polyurethane were weighed and added into a reaction kettle, heated to 60° C., and stirred at a rate of 300 r / min for 60 min to obtain a first component.

[0068] Step 2, preparation of the second component:

[0069] Weigh 120g of base asphalt and 50g of 200# solvent oil, add them into a common reactor, heat to 120℃, stir at a rate of 300r / min for 20min to completely dissolve the base asphalt, cool to below 40℃, then add 20g of epoxy soybean oil and 100g of polyamide 650, stir at a rate of 300r / min until mixed evenly, to obtain the second component.

[0070] Step 3, preparation of composite toughened modified cold mix epoxy asphalt:

[0071] The first component and the second component were added into a reaction kettle and stirred at a rate of 500 r / min for 3 min at room temperature to obtain a composite toughened modified cold-mix epoxy asphalt.

[0072] Example 4

[0073] A method for preparing composite toughened modified cold mix epoxy asphalt comprises the following steps:

[0074] Step 1, preparation of the first component:

[0075] 100 g of epoxy resin, 30 g of polypropylene glycol diglycidyl ether, 10 g of carboxyl-terminated nitrile rubber, and 15 g of polyurethane were weighed and added into a reaction kettle, heated to 60° C., and stirred at a rate of 400 r / min for 60 min to obtain a first component.

[0076] Step 2, preparation of the second component:

[0077] Weigh 60g of base asphalt and 30g of biodiesel, add them into a common reactor, heat to 120°C, stir at a rate of 400r / min for 20min to completely dissolve the base asphalt, cool to below 40°C, add 10g of epoxidized soybean oil and 80g of polyamide 650, stir at a rate of 200r / min until mixed evenly, and obtain the second component.

[0078] Step 3, preparation of composite toughened modified cold mix epoxy asphalt:

[0079] The first component and the second component were added into a reaction kettle and stirred at a rate of 500 r / min for 3 min at room temperature to obtain a composite toughened modified cold-mix epoxy asphalt.

[0080] Comparative Example 1

[0081] A method for preparing composite toughened modified cold mix epoxy asphalt comprises the following steps:

[0082] Step 1, preparation of the first component:

[0083] 100 g of epoxy resin and 30 g of polypropylene glycol diglycidyl ether were weighed, added into a reaction kettle, heated to 60° C., and stirred at a rate of 500 r / min for 60 min to obtain a first component.

[0084] Step 2, preparation of the second component:

[0085] Weigh 100g of base asphalt and 60g of trichloroethylene, add them into a common reactor, heat to 120°C, stir at a rate of 500r / min for 20min to completely dissolve the base asphalt, cool to below 40°C, add 20g of epoxy soybean oil and 100g of polyamide 650, stir at a rate of 500r / min until mixed evenly, and obtain the second component.

[0086] Step 3, preparation of composite toughened modified cold mix epoxy asphalt:

[0087] The first component and the second component were added into a reaction kettle and stirred at a rate of 500 r / min for 3 min at room temperature to obtain a composite toughened modified cold-mix epoxy asphalt.

[0088] Table 1 Feeding conditions of the first component

[0089]

[0090] Note: The epoxy resin diluent is polypropylene glycol diglycidyl ether.

[0091] Table 2 Feeding conditions of the second component

[0092] Second component Base asphalt Asphalt diluent Epoxidized soybean oil Polyamide 650 Comparative Example 1 100g 60g trichloroethylene 20g 100g Example 1 100g 60g trichloroethylene 20g 100g Example 2 80g 50g biodiesel 10g 100g Example 3 120g 50g200# solvent oil 20g 100g Example 4 60g 30g biodiesel 10g 80g

[0093] Table 3 Weight ratio of the first component to the second component

[0094] Weight ratio of the first component to the second component Example 1 1：1 Example 2 1：1 Example 3 1：1 Example 4 1：1

[0095] Test 1: Fluorescence microscopy images.

[0096] Fluorescence microscopic image analysis of the composite toughened modified cold-mix epoxy asphalt prepared in Example 1 showed the following results: Figure 1 shown. Figure 1 This is a fluorescence microscopic image of the composite toughened modified cold mix epoxy asphalt of Example 1 of the present invention.

[0097] Figure 1 In the figure, the dark spots represent asphalt, which is evenly distributed in the epoxy resin matrix, showing a typical island structure. This structure shows that the material has good compatibility, and the interface between asphalt and epoxy resin is evenly distributed, which effectively reduces the phase separation phenomenon. The island structure helps to disperse stress when subjected to force, significantly improves the toughness and strength of the material, and improves crack resistance, ensuring that the cold-mixed epoxy asphalt has excellent mechanical properties after curing to meet actual construction needs.

[0098] Test 2: Related performance test.

[0099] The composite toughened modified cold-mix epoxy asphalt prepared in the above embodiment was subjected to relevant performance tests, and the test methods were as follows: the tensile strength was tested according to the method of GB / T16777-2008; the elongation at break was tested according to the method of GB / T16777-2008; and the residence time was tested according to the method of JTJ052-2000.

[0100] See Table 4 for test results.

[0101] Table 4 Performance test results of composite toughened modified cold mix epoxy asphalt

[0102]

[0103]

[0104] As can be seen from the results in Table 4, Examples 1 to 4 have different degrees of improvement in tensile strength, elongation at break and residence time compared to the comparative example. First, in terms of tensile strength, the comparative example is 1.87MPa, while Example 1 reaches 2.49MPa, with the best strength, and the other embodiments are also higher than 2.1MPa, showing a significant improvement in material strength. In terms of elongation at break, the comparative example is 107.76%, while Example 4 is the highest, reaching 193.17%, indicating that it performs well in toughness and can better resist external force deformation. In addition, in terms of residence time, the comparative example is the longest at 80 minutes, and the 66 minutes of Example 3 is the best in the embodiment, ensuring sufficient construction time. In general, Example 1 focuses on strength, Example 4 has the best toughness, and Example 3 is superior in residence time, suitable for different construction needs.

[0105] In summary, the composite toughened modified cold-mixed epoxy asphalt obtained by the embodiment of the present invention through the epoxy resin diluent has good construction fluidity at room temperature, so that it can be used and transported without heating and can be mixed with stone at room temperature, and has a long operable time. It can be mixed and used at room temperature, which reduces the energy consumption of the composite toughened modified cold-mixed epoxy asphalt, and can effectively avoid the damage of the asphalt fume to the operator's body during heating, and achieve the requirements of green energy saving and environmental protection.

[0106] The composite toughened modified cold-mix epoxy asphalt provided in the embodiment of the present invention has a compatibilizer added thereto, which improves the compatibility between the base asphalt and the epoxy resin, thereby improving the comprehensive performance of the obtained composite toughened modified cold-mix epoxy asphalt; and the curing agent used can form a flexible bridge structure between the asphalt and the epoxy resin, further increasing the compatibility between the base asphalt and the epoxy resin, improving the mechanical strength and stability of the composite toughened modified cold-mix epoxy asphalt, and effectively improving the brittleness of the composite toughened modified cold-mix epoxy asphalt, so that the obtained composite toughened modified cold-mix epoxy asphalt has higher toughness.

[0107] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite toughened modified cold mix epoxy asphalt, characterized in that: It is obtained by mixing the first component and the second component at room temperature; The first component is obtained by mixing the following raw materials in parts by weight at 40°C to 60°C: 100 parts of epoxy resin, 10 to 30 parts of epoxy resin diluent, 10 to 20 parts of carboxyl-terminated nitrile rubber and 5 to 15 parts of polyurethane; The second component is obtained by heating the base asphalt and the asphalt diluent at 110°C to 135°C and stirring until dissolved, then cooling to below 40°C, adding the curing agent and the compatibilizer, and continuing to stir until uniformly mixed, to obtain the second component; The weight ratio of the first component to the second component is 1:

1.

2. The composite toughened modified cold mix epoxy asphalt according to claim 1, characterized in that: The epoxy resin is bisphenol A type epoxy resin.

3. The composite toughened modified cold mix epoxy asphalt according to claim 1, characterized in that: The epoxy resin diluent is polypropylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, 2-glycidyl phenyl glycidyl ether, 2,6-diglycidyl phenyl glycidyl ether, C 12 ~C 14 At least one of alkyl glycidyl ether, benzyl glycidyl ether and decyl glycidyl ether.

4. The composite toughened modified cold mix epoxy asphalt according to claim 1, characterized in that: The polyurethane is a TDI type polyurethane prepolymer.

5. The composite toughened modified cold mix epoxy asphalt according to claim 1, characterized in that: The carboxyl-terminated nitrile rubber has an acrylonitrile content of 33.9% and a molecular weight of 1000-4000.

6. The composite toughened modified cold mix epoxy asphalt according to claim 1, characterized in that: The second component is prepared by mixing the following raw materials in parts by weight: 40 to 120 parts of base asphalt, 10 to 60 parts of asphalt diluent, 80 to 100 parts of curing agent and 10 to 30 parts of volume extender.

7. The composite toughened modified cold mix epoxy asphalt according to claim 6, characterized in that: The matrix asphalt is 70# matrix asphalt; The asphalt diluent is a mixture of any one or more of biodiesel, toluene, solvent oil, xylene, dichloropropane, trichloroethylene, tetrachloroethylene, dibutyl phthalate, and dioctyl phthalate; The curing agent is an amine curing agent; The compatibilizer is a mixture of any one or more of epoxy soybean oil, epoxy stearic acid, epoxy stearate, epoxy oleic acid, epoxy oleate, epoxy linoleic acid, epoxy linoleate and polyethylene oxide stearic acid.

8. The composite toughened modified cold mix epoxy asphalt according to claim 8, characterized in that: The asphalt diluent is trichloroethylene, biodiesel or 200# solvent oil; the curing agent is polyamide 650; and the compatibilizer is epoxidized soybean oil.

9. A method for preparing the composite toughened modified cold mix epoxy asphalt according to any one of claims 1 to 8, characterized in that: The following steps are involved: The epoxy resin, epoxy resin diluent, carboxyl-terminated nitrile rubber and polyurethane are stirred and mixed uniformly at 40° C. to 60° C., and cooled to room temperature to obtain a first component; The base asphalt and the asphalt diluent are heated and stirred at 110°C to 135°C until dissolved, then cooled to below 40°C, the curing agent and the compatibilizer are added, and the stirring is continued until uniformly mixed to obtain the second component; The first component and the second component were stirred and mixed at room temperature in a mass ratio of 1:1 to obtain a composite toughened modified cold-mix epoxy asphalt.

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