A modifier for cold-mixed epoxy asphalt and application thereof

Abstract

The application provides a modifier for cold-mixed epoxy asphalt and application thereof, and belongs to the technical field of pavement materials. The modifier is prepared by introducing several kinds of hydrogenated epoxy resin, organic silicon modified epoxy resin and polyurethane modified epoxy resin with good weather resistance, so that the defect of traditional epoxy resin that is not resistant to aging is improved to some extent, and the cold-mixed epoxy asphalt mixture prepared by the modifier has excellent road performance, fatigue resistance and aging resistance. Meanwhile, the organic silicon and / or polyurethane modified epoxy resin endows the material with excellent mechanical strength, flexibility and bonding performance. By introducing long-chain phenolic amine curing agent and curing accelerator, the application ensures the flexibility and operable time, endows the material with the characteristics of low viscosity, easy mixing, room temperature rapid curing and short curing period, avoids the defects of high-temperature mixing and long curing period of hot-mixed epoxy asphalt used for small-area repair of paving layers, and effectively reduces the influence of the surrounding construction on traffic.

Description

Technical Field

[0001] This invention relates to the field of road material technology, specifically to a modifier for cold-mix epoxy asphalt and its application. Background Technology

[0002] Steel bridge deck paving often suffers from defects such as potholes, shoving, and cracking during actual use, directly impacting traffic comfort and safety. Epoxy asphalt, as an excellent paving material, possesses high strength and toughness, good interlayer bonding, good temperature stability, fatigue resistance, durability, and a linear shrinkage coefficient close to that of steel plates. It also offers advantages such as wear resistance, skid resistance, and prevention of steel plate corrosion. Therefore, epoxy asphalt currently boasts the best overall performance among steel bridge deck paving materials and is widely used.

[0003] Currently, most commonly used epoxy asphalt requires high-temperature mixing and paving, as well as a long curing time and large-scale pavers. However, for routine maintenance or minor repairs of steel bridge pavement, traffic flow necessitates small-area construction with very short curing times. Specifically, when maintaining small areas of damaged steel bridge pavement, traffic pressure limits the construction window to 10 PM to 5 AM the following day, while traditional hot-mix epoxy asphalt typically requires over 7 days of curing time, which is insufficient. With limited curing time and scope, the use of traditional hot-mix epoxy asphalt for pavement maintenance is severely restricted, leading to significantly increased construction costs, decreased quality, and substantial material waste. Therefore, to address the practical problems in steel bridge pavement maintenance, it is necessary to develop a cold-mix epoxy asphalt material that is easy to apply, performs well, has a short curing time, and is widely applicable.

[0004] For example, CN117624919A discloses a cold-mix, cold-lay type vegetable oil-based epoxy asphalt and its preparation method, using epoxy vegetable oil as a reactive diluent to improve the compatibility between epoxy resin and base asphalt while diluting the asphalt. CN116478503A discloses a cold-mix epoxy asphalt for castable asphalt mixtures and its preparation method, addressing the shortcomings of existing castable asphalt mixtures in high-temperature performance by developing a new type of cold-lay epoxy asphalt to adapt to the harsh service environment of heavy loads, high temperatures, and heavy rainfall in my country.

[0005] However, while the aforementioned patents have addressed the shortcomings of conventional hot-mix epoxy asphalt, enabling room-temperature curing, the curing time still requires several days, making it difficult to meet the requirements for daily maintenance of steel bridge pavement defects. Using high-efficiency curing agents (such as phenolic amines like T31, and fatty amines like diethylenetriamine and ethylenediamine) can shorten the curing time, but it severely reduces the flexibility of epoxy asphalt, degrading its road performance. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a modifier for cold-mix epoxy asphalt and its application. The modifier for cold-mix epoxy asphalt provided by this invention, when used in the preparation of epoxy asphalt, has the advantages of room temperature curing, long retention time, short curing time, good flexibility, and good road performance.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0008] This invention provides a modifier for cold-mix epoxy asphalt, comprising separately packaged component A and component B; the mass ratio of component A to component B is 1:0.3 to 0.5.

[0009] The components of component A, by mass parts, include:

[0010] 55-70 parts of composite epoxy resin;

[0011] 15-28 parts of reactive diluent;

[0012] 0.3–1.3 parts of polymer solution dispersant;

[0013] 10–22 parts of bio-based ester solvent;

[0014] The composite epoxy resin includes at least three of the following: bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, silicone-modified epoxy resin, and polyurethane-modified epoxy resin.

[0015] The components of component B, by mass parts, include:

[0016] 4-10 parts of curing accelerator;

[0017] 90-96 parts of amine curing agent;

[0018] The amine curing agents include cashew phenol-modified hexamethylenediamine and polyether monoamine.

[0019] Preferably, the active diluent includes one or more of cashew phenol glycidyl ether, castor oil triglycidyl ether, and diglycidyl dimerase.

[0020] Preferably, the polymer solution dispersant includes dispersant Tech 5541.

[0021] Preferably, the bio-based ester solvent includes one or more of tributyl citrate, acetylated tributyl citrate, and epoxidized soybean oil.

[0022] Preferably, the curing accelerator includes tertiary amine accelerators and / or polyetheramine accelerators.

[0023] Preferably, the composite epoxy resin includes essential components and optional components, wherein the essential components are bisphenol A type epoxy resin and hydrogenated bisphenol A type epoxy resin;

[0024] The optional components are silicone-modified epoxy resin and / or polyurethane-modified epoxy resin.

[0025] The mass ratio of the necessary components to the optional components is 40-50:15-20.

[0026] Preferably, the molecular weight of the polyether monoamine is ≥400;

[0027] The amine curing agent also includes the modified amine curing agent XH-276M;

[0028] The mass ratio of the cashew phenol-modified hexamethylenediamine, polyether monoamine, and modified amine curing agent XH-276M is 60-80:6-10:10-20.

[0029] This invention provides the application of the above-mentioned modifier for cold-mix epoxy asphalt in cold-mix epoxy asphalt.

[0030] This invention provides a cold-mix method for epoxy asphalt, comprising the following steps:

[0031] The base asphalt is mixed with component A of the above-mentioned cold-mix epoxy asphalt modifier to obtain premixed asphalt;

[0032] The premixed asphalt is heated and mixed with aggregates and mineral powder, and then cooled to obtain epoxy asphalt mixture;

[0033] At the application site, the epoxy asphalt mixture is cold-mixed with component B of the above-mentioned cold-mix epoxy asphalt modifier.

[0034] Preferably, the mass ratio of the base bitumen to component A is 40-70:40-70;

[0035] The heating and mixing temperature is 150–175°C, and the time is 1–3 minutes.

[0036] This invention provides a modifier for cold-mix epoxy asphalt, comprising separately packaged component A and component B; the mass ratio of component A to component B is 1:0.3-0.5; by mass parts, component A comprises: 55-70 parts of composite epoxy resin; 15-28 parts of reactive diluent; 0.3-1.3 parts of polymer solution dispersant; and 10-22 parts of bio-based ester solvent; the composite epoxy resin comprises at least three of the following: bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, silicone-modified epoxy resin, and polyurethane-modified epoxy resin; by mass parts, component B comprises: 4-10 parts of curing accelerator; and 90-96 parts of amine curing agent; the amine curing agent comprises cashew nut phenol-modified hexamethylenediamine and polyether monoamine. This invention improves upon the shortcomings of traditional epoxy resins in terms of aging resistance by introducing several types of weather-resistant epoxy resins, including bisphenol A type epoxy resin, hydrogenated epoxy resin, silicone-modified epoxy resin, and polyurethane-modified epoxy resin. The resulting cold-mix epoxy asphalt mixture exhibits excellent road performance, fatigue resistance, and aging resistance. Simultaneously, the silicone and / or polyurethane-modified epoxy resins impart excellent mechanical strength, flexibility, and adhesion properties to the material. By using a polymer solution dispersant, this invention improves the dispersibility of mineral fillers in the cold-mix asphalt system, preventing agglomeration or precipitation. Furthermore, by introducing bio-based ester solvents, this invention effectively improves the compatibility between epoxy resin and asphalt, while avoiding the harmful effects of conventional solvents (such as dibutyl phthalate and dioctyl phthalate) on operators and the environment.

[0037] This invention utilizes cashew phenol-modified hexamethylenediamine curing agent, a long-chain phenolic amine curing agent, which, while ensuring flexibility and workability, imparts to the material the characteristics of low viscosity, easy mixing, rapid curing at room temperature, and short curing period. This avoids the defects of hot-mix epoxy asphalt, which requires high-temperature mixing and has a long curing period, when used for small-area repairs of pavement layers, and effectively reduces the impact of construction enclosure on traffic.

[0038] Furthermore, the polyether monoamine used in this invention has a molecular weight of over 400 and is a type of monoamine polyether with relatively long chain segments. It can act as a flexible curing agent in this invention, and due to its unique molecular structure, it can also emulsify the entire epoxy system and asphalt, thereby improving the workability of each component and facilitating construction.

[0039] The results of the examples show that the modifier for cold-mix epoxy asphalt of the present invention has the characteristics of fast curing, good compatibility with asphalt, excellent mechanical properties, and good flexibility. Its surface drying time is 110 minutes, and it does not delaminate. The tensile strength is above 10 MPa, and the elongation at break is above 80%. When used in cold-mix epoxy asphalt, it has the characteristics of short curing period, good temperature stability, and excellent road performance. Its Marshall stability reaches above 40 kN after 1 hour of curing at room temperature, and reaches 80 kN after 3 hours. The residual stability is above 96%, the freeze-thaw splitting strength ratio is above 90%, and the dynamic stability at 70℃ reaches above 60,000 cycles / mm. Detailed Implementation

[0040] This invention provides a modifier for cold-mix epoxy asphalt, comprising separately packaged component A and component B; the mass ratio of component A to component B is 1:0.3 to 0.5.

[0041] The components of component A, by mass parts, include:

[0042] 55-70 parts of composite epoxy resin;

[0043] 15-28 parts of reactive diluent;

[0044] 0.3–1.3 parts of polymer solution dispersant;

[0045] 10–22 parts of bio-based ester solvent;

[0046] The composite epoxy resin includes at least three of the following: bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, silicone-modified epoxy resin, and polyurethane-modified epoxy resin.

[0047] The components of component B, by mass parts, include:

[0048] 4-10 parts of curing accelerator;

[0049] 90-96 parts of amine curing agent;

[0050] The amine curing agents include cashew phenol-modified hexamethylenediamine and polyether monoamine.

[0051] Unless otherwise specified, all raw materials used in this invention are commercially available.

[0052] The modifier for cold-mix epoxy asphalt provided by this invention, by weight, comprises 55-70 parts of composite epoxy resin, specifically 55, 60, 65, or 70 parts. In this invention, the composite epoxy resin preferably includes essential and optional components. The essential component is bisphenol A type epoxy resin and hydrogenated bisphenol A type epoxy resin; the optional component is silicone-modified epoxy resin and / or polyurethane-modified epoxy resin. In this invention, the bisphenol A type epoxy resin is preferably NPEL 128; the hydrogenated bisphenol A epoxy resin is preferably at least one of EP-4080E and HE-2010; the silicone-modified epoxy resin is preferably EPSI-3266X; and the polyurethane-modified epoxy resin is preferably EPU-300A.

[0053] In this invention, the mass ratio of the bisphenol A type epoxy resin to the hydrogenated bisphenol A type epoxy resin is preferably 33-37:8-11, and more preferably 34-36:9-10.

[0054] In this invention, the bisphenol A type epoxy resin and hydrogenated bisphenol A type epoxy resin have the functions of strengthening and aging resistance, and the organosilicon modified epoxy resin and / or polyurethane modified epoxy resin can endow the material with excellent mechanical strength, flexibility and adhesion properties.

[0055] In this invention, the preferred mass ratio of the essential component to the optional component is 40-50:15-20, specifically 42:18, 42:19, 44:20, or 48:19. By controlling the mass ratio of the essential component to the optional component within the above range, this invention ensures that the material possesses excellent mechanical properties and flexibility, while also ensuring a certain degree of compatibility between the epoxy resin and the asphalt. This, combined with other additives, ensures excellent system compatibility, preventing precipitation or stratification.

[0056] Based on the mass fraction of the composite epoxy resin, component A of the cold-mix epoxy asphalt modifier provided by this invention comprises 15 to 28 parts of an active diluent, specifically 15, 18, 20, 22, 25, or 28 parts. In this invention, the active diluent preferably comprises one or more of cashew phenol glycidyl ether, castor oil triglycidyl ether, and dimer acid diglycidyl ester. In this invention, the above-mentioned active diluent has long carbon chains and epoxy groups, which can effectively improve the compatibility between epoxy resin and asphalt.

[0057] Based on the mass fraction of the composite epoxy resin, component A of the modifier for cold-mix epoxy asphalt provided by this invention includes 0.3 to 1.3 parts of a polymer solution dispersant, preferably 0.3, 0.5, 0.8, 1, or 1.3 parts. In this invention, the polymer solution dispersant preferably includes dispersant Tech5541, which improves the dispersibility of mineral fillers in the cold-mix asphalt system, preventing agglomeration or precipitation. As a specific embodiment of this invention, the preferred supplier of dispersant Tech 5541 is Tiger Additives.

[0058] Based on the mass fraction of the composite epoxy resin, component A of the modifier for cold-mix epoxy asphalt provided by this invention includes 10-22 parts of a bio-based ester solvent, specifically 10, 12, 15, 18, 20, or 22 parts. In this invention, the bio-based ester solvent preferably includes one or more of tributyl citrate, acetylated tributyl citrate, and epoxidized soybean oil. In this invention, the bio-based ester solvent effectively improves the compatibility between epoxy resin and asphalt, while avoiding the harmful effects of conventional solvents on operators and the environment.

[0059] By weight, component B of the cold-mix epoxy asphalt modifier provided by this invention comprises 4 to 10 parts of a curing accelerator, specifically 4, 5, 6, 7, 8, 9, or 10 parts. In this invention, the curing accelerator preferably comprises a tertiary amine accelerator and / or a polyetheramine accelerator. In this invention, the tertiary amine accelerator is preferably DMP-30; in one specific embodiment, the manufacturer of DMP-30 is Changzhou Shanfeng Chemical Co., Ltd.; in this invention, the polyetheramine accelerator is preferably ACCELERATOR 399; in one specific embodiment, ACCELERATOR 399 is purchased from HUNTSMAN Corporation (USA). In this invention, the tertiary amine accelerator promotes the curing of XH276M and cashew phenol-modified hexamethylenediamine, adjusting the curing speed; the polyetheramine accelerator promotes the curing of polyetheramine monoamine, adjusting the curing speed.

[0060] Based on the mass fraction of the curing accelerator, component B of the modifier for cold-mix epoxy asphalt provided by this invention comprises 90-96 parts of an amine curing agent, specifically 90, 91, 92, 93, 94, 95, or 96 parts. In this invention, the amine curing agent includes cashew phenol-modified hexamethylenediamine and polyether monoamine. Preferably, the cashew phenol-modified hexamethylenediamine is cashew phenol-modified hexamethylenediamine QS-701, and the preferred manufacturer is Langfang Jindaoqishi Adhesive Industry Co., Ltd. In this invention, the cashew phenol-modified hexamethylenediamine improves the flexibility of the cured epoxy resin, and its long chains have good compatibility with asphalt.

[0061] In this invention, the molecular weight of the polyether monoamine is preferably ≥400. As a specific embodiment of this invention, the polyether monoamine is model ZM-1100, purchased from Shandong Shangzheng New Material Technology Co., Ltd. The polyether monoamine used in this invention has a molecular weight of 400 or higher and is a type of monoamine polyether with relatively long chain segments. It can act as a flexible curing agent in this invention, and due to its special molecular structure, it can also emulsify the entire epoxy system and asphalt, thereby improving the workability of each component and facilitating construction.

[0062] In this invention, the amine curing agent preferably includes a modified amine curing agent XH-276M. In this invention, the modified amine curing agent XH-276M functions to improve the flexibility of the cured epoxy resin. As a specific embodiment of this invention, the modified amine curing agent XH-276M is purchased from Shenzhen Jiadida New Material Technology Co., Ltd.

[0063] In this invention, the preferred mass ratio of cashew phenol-modified hexamethylenediamine, polyether monoamine, and modified amine curing agent XH-276M is 60–80:6–10:10–20, specifically 71:7:14, 67:6:20, 68:6:18, or 72:10:12. By controlling the proportions of cashew phenol-modified hexamethylenediamine, polyether monoamine, and modified amine curing agent XH-276M within the above-mentioned ratio, this invention ensures good mechanical strength and flexibility while maintaining a suitable curing speed.

[0064] In this invention, the mass ratio of component A to component B is 1:0.3 to 0.5, preferably 1:0.4.

[0065] This invention effectively improves the compatibility between epoxy resin and asphalt by selecting long-chain epoxy resin (organosilicon or polyurethane modified epoxy resin), reactive diluent with cashew phenol structure, amine curing agent and polyether monoamine, and supplementing with bio-based ester solvent. The cold-mix epoxy asphalt mixture prepared with the modifier of this invention has excellent low-temperature performance, high-temperature performance, durability, water stability, crack resistance and other properties, and excellent road performance.

[0066] In this invention, the method for preparing the modifier for cold-mix epoxy asphalt preferably includes the following steps:

[0067] Component A is obtained by mixing composite epoxy resin, reactive diluent, polymer solution dispersant and bio-based ester solvent;

[0068] The curing accelerator and the curing agent are mixed to obtain component B.

[0069] The present invention does not have any special requirements for the above mixing method; any mixing method known in the art can be used, such as stirring.

[0070] This invention provides the application of the above-mentioned modifier for cold-mix epoxy asphalt in cold-mix epoxy asphalt.

[0071] This invention provides a cold-mix method for epoxy asphalt, comprising the following steps:

[0072] The base asphalt is mixed with component A of the cold-mix epoxy asphalt modifier to obtain premixed asphalt;

[0073] The premixed asphalt is heated and mixed with aggregates and mineral powder, and then cooled to obtain epoxy asphalt mixture;

[0074] At the application site, the epoxy asphalt mixture is cold-mixed with component B of the cold-mix epoxy asphalt modifier.

[0075] This invention involves mixing base asphalt with component A of a modifier for cold-mix epoxy asphalt to obtain premixed asphalt. In a specific embodiment of this invention, the base asphalt is No. 70 base asphalt. In this invention, the preferred mass ratio of the base asphalt to component A is 40–70:40–70, more preferably 50–60:50–60, and most preferably 1:1. This invention does not impose any special requirements on the mixing method; any mixing method well-known to those skilled in the art can be used, such as stirring.

[0076] After obtaining the premixed asphalt, the present invention heats and mixes the premixed asphalt with aggregates and mineral powder, and then cools it to obtain epoxy asphalt mixture. The present invention does not have special requirements on the type or particle size distribution of the aggregates and mineral powder; types and amounts of aggregates and mineral powder known to those skilled in the art can be used. As a specific embodiment of the present invention, the aggregates and mineral powder are graded according to EA-10, and their technical indicators meet the "Quality Requirements for Aggregates and Mineral Powder for Asphalt Mixtures" of expressways and first-class highways in the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40-2004). In the present invention, the aggregates and mineral powder are preferably dried before use.

[0077] In this invention, the mass of the premixed asphalt is preferably 4.5 to 5.5% of the total mass of aggregates and mineral powder, more preferably 5.0%.

[0078] In this invention, the heating and mixing temperature is preferably 150–175°C, more preferably 165°C, and the time is preferably 1–3 min, more preferably 2 min. In this invention, the cooling is preferably natural cooling.

[0079] After obtaining the epoxy asphalt mixture, the present invention involves cold-mixing the epoxy asphalt mixture with component B of the cold-mix epoxy asphalt modifier at the application site. In this invention, the preferred temperature for cold mixing is the outdoor ambient temperature, preferably ≤40℃, and the preferred time is ≥3 minutes.

[0080] The following detailed description, in conjunction with embodiments, illustrates the modifiers for cold-mix epoxy asphalt provided by the present invention and their applications, but these should not be construed as limiting the scope of protection of the present invention.

[0081] Example 1

[0082] The cold-mix epoxy asphalt modifier provided in this embodiment includes component A and component B in a mass ratio of 1:0.4. Component A is composed of the following raw materials in parts by mass:

[0083]

[0084] Component B is composed of the following raw materials in parts by mass:

[0085]

[0086] The preparation method of the modifier for cold-mix epoxy asphalt is as follows:

[0087] (1) Weigh out epoxy resin NPEL 128, hydrogenated epoxy resin HE-2010, polyurethane modified epoxy resin EPU-300A, cashew phenol glycidyl ether, diglycidyl dimerase, dispersant Tech 5541 and tributyl citrate according to the above dosage relationship, mix them evenly to obtain component A for later use.

[0088] (2) According to the above dosage relationship, weigh out the tertiary amine accelerator DMP-30, polyether amine accelerator ACCELERATOR 399, cashew phenol modified hexamethylenediamine QS-701, polyether monoamine curing agent ZM-1100, and modified amine curing agent XH-276M, mix them evenly to obtain component B for later use.

[0089] Preparation of test samples:

[0090] Preheat 70# base asphalt to 145℃, then mix it with component A of cold-mix epoxy asphalt modifier at a mass ratio of 100:100 and stir evenly. After cooling to room temperature, mix it with component B of cold-mix epoxy asphalt modifier at a mass ratio of 100:20 to obtain a cold-mix epoxy asphalt test sample.

[0091] Example 2

[0092] The cold-mix epoxy asphalt modifier provided in this embodiment includes component A and component B in a mass ratio of 1:0.45. Component A is composed of the following raw materials in parts by mass:

[0093]

[0094] Component B is composed of the following raw materials in parts by mass:

[0095]

[0096] The preparation method of the modifier for cold-mix epoxy asphalt is as follows:

[0097] (1) Weigh out epoxy resin NPEL 128, hydrogenated epoxy resin HE-2010, polyurethane modified epoxy resin EPU-300A, organosilicon modified epoxy resin EPSI-3266X, cashew phenol glycidyl ether, castor oil triglycidyl ether, dispersant Tech 5541 and tributyl citrate according to the above dosage relationship, mix them evenly to obtain component A for later use;

[0098] (2) According to the above dosage relationship, weigh out the tertiary amine accelerator DMP-30, polyether amine accelerator ACCELERATOR 399, cashew phenol modified hexamethylenediamine QS-701, polyether monoamine curing agent ZM-1100 and modified amine curing agent XH-276M, mix them evenly to obtain component B for later use.

[0099] Preparation of test samples:

[0100] Preheat 70# base asphalt to 145℃, then mix it with component A of cold-mix epoxy asphalt modifier at a mass ratio of 100:100 and stir evenly. After cooling to room temperature, mix it with component B of cold-mix epoxy asphalt modifier at a mass ratio of 100:22.5 to obtain cold-mix epoxy asphalt.

[0101] Example 3

[0102] The cold-mix epoxy asphalt modifier provided in this embodiment includes component A and component B in a mass ratio of 1:0.45. Component A is composed of the following raw materials in parts by mass:

[0103]

[0104] Component B is composed of the following raw materials in parts by mass:

[0105]

[0106] The preparation method of the modifier for cold-mix epoxy asphalt is as follows:

[0107] (1) Weigh out epoxy resin NPEL 128, hydrogenated epoxy resin HE-2010, polyurethane modified epoxy resin EPU-300A, cashew phenol glycidyl ether, castor oil triglycidyl ether, dispersant Tech 5541 and tributyl citrate according to the above dosage relationship, mix them evenly to obtain component A for later use.

[0108] (2) According to the above dosage relationship, weigh out the tertiary amine accelerator DMP-30, cashew phenol modified hexamethylenediamine QS-701, modified amine curing agent XH-276M and polyether monoamine curing agent ZM-1100, mix them evenly to obtain component B for later use.

[0109] Preparation of test samples:

[0110] Preheat 70# base asphalt to 145℃, then mix it with component A of cold-mix epoxy asphalt modifier at a mass ratio of 100:100 and stir evenly. After cooling to room temperature, mix it with component B of cold-mix epoxy asphalt modifier at a mass ratio of 100:22.5 to obtain cold-mix epoxy asphalt.

[0111] Example 4

[0112] The cold-mix epoxy asphalt modifier provided in this embodiment includes component A and component B in a mass ratio of 1:0.4. Component A is composed of the following raw materials in parts by mass:

[0113]

[0114] Component B is composed of the following raw materials in parts by mass:

[0115]

[0116] The preparation method of the modifier for cold-mix epoxy asphalt is as follows:

[0117] (1) Weigh out epoxy resin NPEL 128, hydrogenated epoxy resin HE-2010, polyurethane modified epoxy resin EPU-300A, organosilicon modified epoxy resin EPSI-3266X, cashew phenol glycidyl ether, dispersant Tech5541 and tributyl citrate according to the above dosage relationship, mix them evenly to obtain component A for later use.

[0118] (2) According to the above dosage relationship, weigh out the tertiary amine accelerator DMP-30, polyether amine accelerator ACCELERATOR 399, cashew phenol modified hexamethylenediamine QS-701, polyether monoamine curing agent ZM-1100 and modified amine curing agent XH-276M, mix them evenly to obtain component B for later use.

[0119] Preparation of test samples:

[0120] Preheat 70# base asphalt to 145℃, then mix it with component A of cold-mix epoxy asphalt modifier at a mass ratio of 100:100 and stir evenly. After cooling to room temperature, mix it with component B of cold-mix epoxy asphalt modifier at a mass ratio of 100:20 to obtain cold-mix epoxy asphalt.

[0121] Comparative Example 1

[0122] A commercially available foreign-made hot-mix epoxy asphalt binder BEP is prepared by mixing component A, component B, and base asphalt component in a mass ratio of 56:44:56.

[0123] Comparative Example 2

[0124] The cold-mix epoxy asphalt modifier provided in this comparative example comprises components A and B in a mass ratio of 1:0.4, wherein component A is composed of the following raw materials in parts by mass:

[0125]

[0126] Component B is composed of the following raw materials in parts by mass:

[0127]

[0128] The preparation method of the modifier for cold-mix epoxy asphalt is as follows:

[0129] (1) Weigh out epoxy resin NPEL 128, polyurethane modified epoxy resin EPU-300A, cashew phenol glycidyl ether, dispersant Tech 5541 and tributyl citrate according to the above dosage relationship, mix them evenly to obtain component A for later use.

[0130] (2) According to the above dosage relationship, weigh out the tertiary amine accelerator DMP-30, polyether amine accelerator ACCELERATOR 399, phenolic amine T31, and polyether amine curing agent D2000, mix them evenly to obtain component B for later use.

[0131] Preparation of test samples:

[0132] Preheat 70# base asphalt to 145℃, then mix it with component A of cold-mix epoxy asphalt modifier at a mass ratio of 100:100 and stir evenly. After cooling to room temperature, mix it with component B of cold-mix epoxy asphalt modifier at a mass ratio of 100:20 to obtain cold-mix epoxy asphalt.

[0133] Comparative Example 3

[0134] The cold-mix epoxy asphalt modifier provided in this embodiment includes component A and component B in a mass ratio of 1:0.4. Component A is composed of the following raw materials in parts by mass:

[0135] 60 parts by weight of epoxy resin NPEL 128;

[0136] Butyl glycidyl ether (BGE) 18 parts by weight;

[0137] 22 parts by weight of benzyl alcohol;

[0138] Component B is composed of the following raw materials in parts by mass:

[0139]

[0140]

[0141] The preparation method of the modifier for cold-mix epoxy asphalt is as follows:

[0142] (1) Weigh epoxy resin NPEL 128, butyl glycidyl ether BGE and benzyl alcohol according to the above dosage relationship, mix them evenly to obtain component A for later use.

[0143] (2) According to the above dosage relationship, weigh out the tertiary amine accelerator DMP-30, phenolic amine T31, polyether amine curing agent D400, and modified amine curing agent XH-276M, mix them evenly to obtain component B for later use.

[0144] Preparation of test samples:

[0145] Preheat 70# base asphalt to 145℃, then mix it with cold-mix epoxy asphalt modifier A component at a mass ratio of 100:100 and stir evenly. After cooling to room temperature, mix it with modified cold-mix epoxy asphalt B component at a mass ratio of 100:20 to obtain cold-mix epoxy asphalt.

[0146] Application Example 1

[0147] Prepare aggregates and mineral powder according to EA-10 gradation, and ensure that the technical indicators meet the "Quality Requirements of Aggregates and Mineral Powder for Asphalt Mixtures" of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTGF40-2004) for expressways and first-class highways. The aggregates and mineral powder shall be dried before use.

[0148] In Example 1, component A and new 70# base asphalt were weighed and mixed evenly at a mass ratio of 1:1 to obtain epoxy asphalt. Aggregates and mineral powder were added to a mixing pot and stirred. The evenly mixed epoxy asphalt was then added and stirred at 165°C for 2 minutes to obtain the epoxy asphalt mixture. After cooling to room temperature, it was individually packaged. The mass of the epoxy asphalt was 5.0% of the total mass of the aggregates and mineral powder. Component B was prepared according to Example 1 and individually packaged, with a dosage of 1.0% of the total mass of the aggregates and mineral powder.

[0149] In actual use, the individually packaged epoxy asphalt mixture and component B are mixed evenly on site according to the mass ratio of components A and B for the cold-mix epoxy asphalt modifier in the embodiment.

[0150] Application Example 2

[0151] The difference from Application Example 1 is that the modifier for cold-mixed epoxy asphalt in Example 1 is replaced with the modifier for cold-mixed epoxy asphalt in Example 2, and the amount of component B is 1.125% of the total mass of aggregate and mineral powder. The rest is the same as Application Example 1.

[0152] Application Example 3

[0153] The difference from Application Example 1 is that the modifier for cold-mixed epoxy asphalt in Example 1 is replaced with the modifier for cold-mixed epoxy asphalt in Example 3, and the amount of component B is 1.125% of the total mass of aggregate and mineral powder. The rest is the same as Application Example 1.

[0154] Application Example 4

[0155] The difference from Application Example 1 is that the modifier for cold-mixed epoxy asphalt in Example 1 is replaced with the modifier for cold-mixed epoxy asphalt in Example 4, and the amount of component B is 1.0% of the total mass of aggregate and mineral powder. The rest is the same as Application Example 1.

[0156] Comparative Application Example 1

[0157] The difference from Application Example 1 is that the modifier for cold-mixed epoxy asphalt in Example 1 is replaced with the epoxy binder BEP for cold-mixed epoxy asphalt in Comparative Example 1. The amount of component B is 1.96% of the total mass of aggregates and mineral powder. The rest is the same as Application Example 1.

[0158] Comparative Application Example 2

[0159] The difference from Application Example 1 is that the modifier for cold-mix epoxy asphalt in Example 1 is replaced with the modifier for hot-mix epoxy asphalt in Comparative Example 2, and the amount of component B is 1.0% of the total mass of aggregate and mineral powder. The rest is the same as Application Example 1.

[0160] Comparative Application Example 3

[0161] The difference from Application Example 1 is that the modifier for cold-mixed epoxy asphalt in Example 1 is replaced with the modifier for cold-mixed epoxy asphalt in Comparative Example 3, and the amount of component B is 1.0% of the total mass of aggregates and mineral powder. The rest is the same as Application Example 1.

[0162] Performance testing

[0163] Mechanical property testing: Tensile strength and elongation at break were determined according to GB / T 1040.3-2006;

[0164] Surface drying time: Spread the mixed adhesive solution on a mold with a depth of 2mm, a length of 15cm, and a width of 10cm. Place it at room temperature of 25±3℃ and test the time when the adhesive film surface is no longer sticky to the touch.

[0165] Storage stability: Prepare the modifier A component for cold-mixed asphalt according to Examples 1-4 and Comparative Examples 1-3, mix it with asphalt at a mass ratio of 1:1, place it in a 60℃ oven for 2 weeks, and observe whether the liquid separates into layers.

[0166] The mechanical properties of the cold-mix epoxy asphalt materials in Examples 1-4 and Comparative Examples 1-3 are shown in Table 1. The properties of the cold-mix epoxy asphalt mixtures obtained in Application Examples 1-4 and Comparative Application Examples 1-3 are shown in Table 2.

[0167] Table 1 Mechanical properties of cold-mixed epoxy asphalt materials

[0168]

[0169]

[0170] As shown in Table 1, the cold-mix epoxy asphalt modifier prepared in this invention has the characteristics of fast curing, good compatibility with asphalt, excellent mechanical properties, and good flexibility. Examples 1-4 had a surface drying time of approximately 110 minutes, and none exhibited delamination. Their tensile strengths were all above 10 MPa, and their elongation at break was all above 80%. In contrast, Comparative Example 1 had a surface drying time as long as 420 minutes, exhibited slight delamination, and had a tensile strength that was too low, less than 1 MPa. Comparative Example 2 cured relatively quickly, but its elongation was low, and its toughness was poor. Comparative Example 3 showed delamination.

[0171] Table 2 shows the properties of the cold-mixed epoxy asphalt mixtures obtained from Application Examples 1-4 and Comparative Application Examples 1-3.

[0172]

[0173] Note: 1. Mix the components thoroughly at room temperature and prepare the Marshall specimen according to the steps described in the application example. Cure outdoors (at an temperature of approximately 28°C) for the appropriate time before testing. 2. Mix the components thoroughly according to the steps described in the application example and cure at room temperature for the appropriate time before preparing the Marshall specimen. Cure at room temperature for 1 day before testing. 3. Because the maximum range of the equipment protection program is set to 80kN, the actual strength may exceed 80kN. 4. The maximum range of the equipment protection program is set to 63,000 times / mm, so the actual result may exceed this 63,000 times / mm.

[0174] As shown in Table 2, the cold-mixed epoxy asphalt mixture prepared by the modifier of this invention has the characteristics of short curing period, good temperature stability, and excellent road performance. In Application Examples 1-4, after curing at room temperature for 1 hour, the Marshall stability reaches over 40 kN, and after 3 hours, it reaches 80 kN. The residual stability is over 96%, the freeze-thaw splitting strength ratio is over 90%, and the dynamic stability at 70℃ reaches over 60,000 cycles / mm. Among these, Comparative Application Example 1 has a lower Marshall stability, indicating a slower curing speed, consistent with the results in Table 1. Comparative Application Example 2, although curing faster, has a lower flexural strain, indicating that its flexibility is generally poor, which is less favorable for its application on steel bridge decks.

[0175] In summary, the cold-mix epoxy asphalt modifier prepared by this invention has the characteristics of being easy to use, having a short curing period, good mechanical and adhesive properties, good compatibility with asphalt, excellent comprehensive performance, good durability, and low overall cost.

[0176] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A modifier for cold-mix epoxy asphalt, characterized in that, It includes individually packaged components A and B; the mass ratio of component A to component B is 1:0.3~0.5; The components of component A, by mass parts, include: 55-70 parts of composite epoxy resin; 15-28 parts of reactive diluent; 0.3~1.3 parts of polymer solution dispersant; 10-22 parts of bio-based ester solvent; The composite epoxy resin includes essential components and optional components, wherein the essential components are bisphenol A type epoxy resin and hydrogenated bisphenol A type epoxy resin; The optional components are silicone-modified epoxy resin and / or polyurethane-modified epoxy resin. The mass ratio of the necessary component to the optional component is 40~50:15~20; The bio-based ester solvents include one or more of tributyl citrate, acetylated tributyl citrate, and epoxidized soybean oil; The components of component B, by mass parts, include: 4-10 parts of curing accelerator; 90-96 parts of amine curing agent; The amine curing agents include cashew phenol-modified hexamethylenediamine and polyether monoamine.

2. The modifier for cold-mix epoxy asphalt according to claim 1, characterized in that, The active diluent includes one or more of cashew phenol glycidyl ether, castor oil triglycidyl ether, and diglycidyl dimerase.

3. The modifier for cold-mix epoxy asphalt according to claim 1, characterized in that, The polymer solution dispersant includes dispersant Tech 5541.

4. The modifier for cold-mix epoxy asphalt according to claim 1 or 3, characterized in that, The curing accelerator includes tertiary amine accelerators and / or polyetheramine accelerators.

5. The modifier for cold-mix epoxy asphalt according to claim 1, characterized in that, The molecular weight of the polyether monoamine is ≥400; The amine curing agent also includes the modified amine curing agent XH-276M; The mass ratio of the cashew phenol-modified hexamethylenediamine, polyether monoamine, and modified amine curing agent XH-276M is 60~80:6~10:10~20.

6. The application of the modifier for cold-mix epoxy asphalt according to any one of claims 1 to 5 in cold-mix epoxy asphalt.

7. A cold-mix method for epoxy asphalt, characterized in that, Includes the following steps: The base asphalt is mixed with component A of the cold-mix epoxy asphalt modifier according to any one of claims 1 to 5 to obtain premixed asphalt; The premixed asphalt is heated and mixed with aggregates and mineral powder, and then cooled to obtain epoxy asphalt mixture; At the application site, the epoxy asphalt mixture is cold-mixed with component B of the cold-mix epoxy asphalt modifier according to any one of claims 1 to 5.

8. The cold mixing method according to claim 7, characterized in that, The mass ratio of the base bitum to component A is 40~70:40~70; The heating and mixing temperature is 150~175℃, and the time is 1~3 minutes.

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