Epoxy resin cementing material for elastic pavement and preparation method of epoxy resin cementing material

Abstract

The invention relates to an epoxy resin cementing material for an elastic pavement and a preparation method thereof.The preparation method of the epoxy resin cementing material comprises the steps that S1, a diluent, epoxy resin and a curing agent with the molar ratio being (1-2.5): 1: (0.23-0.4) are mutually dissolved and stirred to react, after reactants are cooled to the room temperature, an accelerant is added, stirring is conducted, and an epoxy resin binding material is obtained; wherein the weight of the accelerant accounts for 0.8-1.4% of the sum of the weight of the diluent, the weight of the epoxy resin and the weight of the curing agent; and S2, stirring a filler and the epoxy resin binder according to a mass ratio of (0.7-1.4): 1 to obtain the epoxy resin cementing material. The epoxy resin cementing material can effectively enhance the durability of the rubber elastic pavement.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering materials, and particularly relates to an epoxy resin binder for elastic pavement and a preparation method thereof. Background Art

[0002] Elastic pavement is a new type of pavement primarily composed of rubber particles, stone, and a polymer binder. The rubber content typically accounts for no less than 20% of the mix by weight, resulting in excellent noise reduction and environmental friendliness. While rubber elastic pavement demonstrates excellent noise reduction, existing technologies employ binders that differ significantly in their service temperature range and mechanical properties from those of high-elastic rubber. This can lead to stress concentration at the rubber-binder interface at low temperatures, causing localized cracking in the mix and poor durability, shortening the service life of rubber elastic pavement.

[0003] Existing technology uses elastic polyurethane binder to improve the durability of rubber aggregate pavement by increasing the amount of polyurethane binder used; and enhances the adhesion between rubber and polyurethane binder through rubber particle surface modification technology.

[0004] However, the polyurethane binder has insufficient adhesion to rubber, and the existing polyurethane binder still has large mechanical properties with rubber particles at certain temperatures, resulting in insufficient durability of polyurethane-based rubber elastic pavement. The surface modification process of rubber particles is complicated, which increases production costs and construction difficulty. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an epoxy resin binder for elastic pavement and a preparation method thereof. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] An embodiment of the present invention provides a method for preparing an epoxy resin binder for an elastic pavement, comprising the steps of:

[0007] S1. Dissolve a diluent, an epoxy resin, and a curing agent in a molar ratio of (1-2.5):1:(0.23-0.4) and stir to react. After the reactant is cooled to room temperature, add an accelerator and stir to obtain an epoxy resin binder; wherein the weight of the accelerator accounts for 0.8-1.4% of the total weight of the diluent, the epoxy resin, and the curing agent;

[0008] S2. Stir the filler and the epoxy resin binder in a mass ratio of (0.7-1.4):1 to obtain the epoxy resin binder.

[0009] In one embodiment of the present invention, the epoxy resin comprises a bisphenol A epoxy resin having an epoxy equivalent of 185 to 230 g / mol and a density of 1.15 to 1.2 g / cm3 .

[0010] In one embodiment of the present invention, the diluent is obtained by stirring polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of (4.5-9):1:(0.5-1) at 30-50°C.

[0011] In one embodiment of the present invention, the curing agent is obtained by stirring trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of (6-8):1:(0.5-1.5) at 30-50°C.

[0012] In one embodiment of the present invention, the accelerator comprises 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:(0.5-0.8).

[0013] In one embodiment of the present invention, the filler comprises modified rubber powder and limestone powder, wherein:

[0014] The modified rubber powder is obtained by surface treating rubber powder with a silane coupling agent;

[0015] The mass of the modified rubber powder is less than or equal to 20% of the mass of the limestone powder.

[0016] In one embodiment of the present invention, step S1 includes:

[0017] A diluent, epoxy resin and curing agent in a molar ratio of (1-2.5):1:(0.23-0.4) are dissolved in each other and stirred at 50-70°C for 10-20 minutes. After the reactant is cooled to room temperature, an accelerator is added and stirred for 5-10 minutes to obtain an epoxy resin binder.

[0018] In one embodiment of the present invention, step S2 includes:

[0019] At room temperature, the filler and the epoxy resin binder in a mass ratio of (0.7-1.4):1 are first stirred at 300-500 rpm for 300-420 s, and then stirred at 500-1000 rpm for 300-420 s to obtain the epoxy resin binder.

[0020] Another embodiment of the present invention provides an epoxy resin binder for elastic pavement, comprising: a filler and an epoxy resin binder in a mass ratio of (0.7-1.4):1, wherein:

[0021] The raw materials of the epoxy resin binder include diluent, epoxy resin, curing agent and accelerator;

[0022] The molar ratio of the diluent, the epoxy resin, and the curing agent is (1-2.5):1:(0.23-0.4);

[0023] The weight of the accelerator accounts for 0.8-1.4% of the total weight of the diluent, the epoxy resin and the curing agent.

[0024] In one embodiment of the present invention, the high elastic service temperature of the epoxy resin binder is greater than or equal to -25°C, the viscosity is 2 to 30 Pa·s, and the gel time is greater than or equal to 1 hour.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The epoxy resin binder preparation method of the present invention first stirs a diluent, epoxy resin, a curing agent and an accelerator to obtain an epoxy resin binder, and then stirs the epoxy resin binder and a filler to obtain an epoxy resin binder. The epoxy resin binder has good flexibility, is in a stable high-elastic state at low temperatures and a wide temperature range, has good low-temperature elastic recovery ability, and has a similar modulus to that of rubber particles, which can significantly reduce interfacial stress and improve the overall quality and durability of the rubber elastic pavement; in addition, the epoxy resin binder has good adhesion to the rubber particles, which can effectively enhance the durability of the rubber elastic pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic flow chart of a method for preparing an epoxy resin binder for elastic pavement provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0029] Example 1

[0030] See Figure 1 , Figure 1 The present invention provides a flow chart of a method for preparing an epoxy resin binder for elastic pavement. The method for preparing the epoxy resin binder comprises the following steps:

[0031] S1. Dissolve a diluent, epoxy resin, and curing agent in a molar ratio of (1-2.5):1:(0.23-0.4) and stir to react. After the reactant is cooled to room temperature, add an accelerator and stir to obtain an epoxy resin binder.

[0032] Specifically, a diluent, epoxy resin, and curing agent are dissolved in a molar ratio of (1-2.5):1:(0.23-0.4), stirred and reacted at 50-70°C for 10-20 minutes, and an accelerator is added and stirred for 5-10 minutes after the reactant is cooled to room temperature to obtain an epoxy resin binder. The weight of the accelerator accounts for 0.8-1.4% of the total weight of the diluent, epoxy resin, and curing agent.

[0033] Furthermore, the epoxy resin includes bisphenol A epoxy resin, the epoxy equivalent of bisphenol A epoxy resin is 185-230 g / mol, and the density is 1.15-1.2 g / cm 3 .

[0034] Specifically, the diluent is obtained by stirring polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of (4.5-9):1:(0.5-1) at 30-50° C., and illustratively, the stirring time is 15 minutes.

[0035] Furthermore, the curing agent is obtained by stirring trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of (6-8):1:(0.5-1.5) at 30-50° C., and illustratively, the stirring time is 20 minutes.

[0036] Furthermore, the accelerator includes 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:(0.5-0.8).

[0037] Furthermore, the filler includes modified rubber powder and limestone powder. The rubber powder's performance meets the technical requirements of "Vulcanized Rubber Powder from Scrap Tires for Road Use (JT / T 797-2011)," while the limestone powder's performance meets the technical requirements of "Technical Specification for Highway Asphalt Pavement Construction" (JTG F40-2004). The modified rubber powder is surface-treated with a silane coupling agent, resulting in a 150-mesh fineness. The silane coupling agent is added in an amount of 0.8% by weight of the rubber powder, and the weight of the modified rubber powder is less than or equal to 20% of the weight of the limestone powder.

[0038] In this embodiment, the curing agent includes trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine. The thiol groups in trimethylolpropane tris(3-mercaptopropionic acid) and pentaerythritol tetrakis-3-mercaptopropionate provide high crosslinking density, while the flexible ether bonds of the polyetheramine form an elastic network in the initial stage. The two chemically complement each other through thioether bonds and ether bonds, thereby ensuring high-temperature strength and providing low-temperature elasticity.

[0039] In this embodiment, 1-cyanoethyl-2-ethyl-4-methylimidazole is used as a promoter to synergize with 2,4,6-tris(dimethylaminomethyl)phenol to achieve staged curing, thereby extending the operable time and ensuring the mechanical stability of the cured material.

[0040] In this embodiment, the delayed curing properties of the accelerator 1-cyanoethyl-2-ethyl-4-methylimidazole and the flexibility of the curing agent polyetheramine match the time gradient formed in the initial cross-linking reaction, avoiding stress concentration caused by premature cross-linking, while the accelerating effect of 2,4,6-tris(dimethylaminomethyl)phenol keeps pace with the reaction process of the highly active mercapto curing agent in the later stage of curing, jointly promoting the cross-linking reaction and ensuring that the cross-linking density gradually increases.

[0041] In this embodiment, 1-cyanoethyl-2-ethyl-4-methylimidazole reacts with polyetheramine to form hydrogen bonds, thereby enhancing the interfacial adhesion between the epoxy resin binder and the silanized rubber filler, thereby improving the integrity of the epoxy resin binder.

[0042] S2. Stir the filler and epoxy resin binder in a mass ratio of (0.7-1.4):1 to obtain the epoxy resin binder.

[0043] Specifically, at room temperature, a filler and an epoxy resin binder in a mass ratio of (0.7-1.4):1 are first stirred at 300-500 rpm for 300-420 s, and then stirred at 500-1000 rpm for 300-420 s to obtain an epoxy resin binder.

[0044] Furthermore, the prepared epoxy resin binder has a high elastic service temperature greater than or equal to -25°C, a viscosity of 2 to 30 Pa·s, and a gel time greater than or equal to 1 hour.

[0045] The preparation method of the epoxy resin binder in this embodiment is to first stir a diluent, epoxy resin, curing agent and accelerator to obtain an epoxy resin binder, and then stir the epoxy resin binder and filler to obtain an epoxy resin binder. The epoxy resin binder can react at a relatively low temperature, the reaction conditions are mild, and the epoxy resin binder is easy to form.

[0046] The epoxy resin binder prepared by the preparation method of this embodiment has good flexibility, is in a stable high-elastic state within a wide temperature range at low temperatures, has good low-temperature elastic recovery ability, and has a similar modulus to that of rubber particles, which can significantly reduce interfacial stress and improve the overall quality and durability of the rubber elastic pavement; in addition, the epoxy resin binder has good adhesion to the rubber particles, which can effectively enhance the durability of the rubber elastic pavement.

[0047] Example 2

[0048] Based on Example 1, this example provides an epoxy resin binder for elastic pavement. The epoxy resin binder comprises a filler and an epoxy resin binder in a mass ratio of (0.7-1.4):1. The raw materials of the epoxy resin binder include a diluent, an epoxy resin, a curing agent, and an accelerator. The molar ratio of the diluent, epoxy resin, and curing agent is (1-2.5):1:(0.23-0.4). The weight of the accelerator accounts for 0.8-1.4% of the total weight of the diluent, epoxy resin, and curing agent.

[0049] Specifically, the epoxy resin includes bisphenol A epoxy resin, the epoxy equivalent of bisphenol A epoxy resin is 185-230 g / mol, the density is 1.15-1.2 g / cm 3 .

[0050] Specifically, the diluent includes polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of (4.5-9):1:(0.5-1).

[0051] Specifically, the curing agent includes trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of (6-8):1:(0.5-1.5).

[0052] Specifically, the accelerator includes 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:(0.5-0.8).

[0053] Specifically, the filler includes modified rubber powder and limestone powder; wherein the modified rubber powder is obtained by surface-treating rubber powder with a silane coupling agent; and the mass of the modified rubber powder is less than or equal to 20% of the mass of the limestone powder.

[0054] Specifically, the high elastic service temperature of the epoxy resin binder of this embodiment is greater than or equal to -25°C, the viscosity is 2 to 30 Pa·s, and the gel time is greater than or equal to 1 hour.

[0055] The epoxy resin binder of this embodiment has good flexibility, is in a stable high-elastic state within a wide temperature range at low temperatures, has good low-temperature elastic recovery ability, and has a similar modulus to that of rubber particles, which can significantly reduce interfacial stress and improve the overall quality and durability of the rubber elastic pavement; in addition, the epoxy resin binder and rubber particles have good adhesion, which can effectively enhance the durability of the rubber elastic pavement.

[0056] The epoxy resin binder of this embodiment has a wide temperature range, suitable viscosity and gel time, and good construction and workability.

[0057] Example 3

[0058] Based on Example 1 and Example 2, this embodiment illustrates the epoxy resin binder for elastic pavement and its preparation method through the following examples and comparative examples.

[0059] Example 1

[0060] Polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 8:1:0.8 were stirred at 40°C for 15 minutes to obtain a diluent, trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 were stirred at 40°C for 20 minutes to obtain a curing agent, the accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.6, and the filler was composed of limestone powder and 150 mesh silanized rubber powder in a mass ratio of 10:1.

[0061] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0062] Example 2

[0063] Polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 4.5:1:1 are stirred at 40°C for 15 minutes to obtain a diluent, trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 6:1:0.5 are stirred at 40°C for 20 minutes to obtain a curing agent, the accelerator is 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.8, and the filler is completely composed of limestone slag.

[0064] The diluent, epoxy resin and curing agent with a molar ratio of 1:1:0.4 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1.4% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.4:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0065] Example 3

[0066] The diluent was obtained by stirring polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 9:1:0.5 at 40°C for 15 minutes, and the curing agent was obtained by stirring trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 9:1:1.5 at 40°C for 20 minutes. The accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.5. The filler was composed of limestone powder and 150 mesh silanized rubber powder in a mass ratio of 5:1.

[0067] The diluent, epoxy resin and curing agent with a molar ratio of 2.5:1:0.23 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 0.8% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 0.7:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0068] Comparative Example 1

[0069] Polypropylene glycol diglycidyl ether was used as a diluent, and trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 were stirred at 40°C for 20 minutes to obtain a curing agent. The accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.6. The filler consisted of limestone powder and 150 mesh silanized rubber powder in a mass ratio of 10:1.

[0070] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0071] Comparative Example 2

[0072] The diluent was obtained by stirring polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 8:1:0.8 at 40°C for 15 minutes. Only pentaerythritol tetrakis-3-mercaptopropionate curing agent was used, and the filler consisted of limestone powder and 150 mesh rubber powder in a mass ratio of 10:1.

[0073] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0074] Comparative Example 3

[0075] Polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 8:1:0.8 were stirred at 40°C for 15 minutes to obtain a diluent, trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 were stirred at 40°C for 20 minutes to obtain a curing agent, the accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.6, and the filler was composed of limestone powder and 150 mesh silanized rubber powder in a mass ratio of 3:1.

[0076] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0077] Comparative Example 4

[0078] Polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 8:1:0.8 were stirred at 40°C for 15 minutes to obtain a diluent, trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 were stirred at 40°C for 20 minutes to obtain a curing agent, the accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.6, and the filler was composed of limestone powder and 150 mesh silanized rubber powder in a mass ratio of 10:1.

[0079] The diluent, epoxy resin and curing agent with a molar ratio of 4:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0080] Comparative Example 5

[0081] Polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 8:1:0.8 were stirred at 40°C for 15 minutes to obtain a diluent, trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 were stirred at 40°C for 20 minutes to obtain a curing agent, the accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.6, and the filler was composed of limestone powder and 150 mesh silanized rubber powder in a mass ratio of 10:1.

[0082] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.15 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0083] Comparative Example 6

[0084] Polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 8:1:0.8 were stirred at 40°C for 15 minutes to obtain a diluent, trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 were stirred at 40°C for 20 minutes to obtain a curing agent, the accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.6, and the filler was composed of limestone powder and 150 mesh silanized rubber powder in a mass ratio of 10:1.

[0085] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 3% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0086] Comparative Example 7

[0087] Phenyl glycidyl ether was used as a diluent, and trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 were stirred at 40°C for 20 minutes to obtain a curing agent. The accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.6. The filler consisted of limestone powder and 150 mesh silanized rubber powder in a mass ratio of 10:1.

[0088] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0089] Comparative Example 8

[0090] Polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 8:1:0.8 were stirred at 40°C for 15 minutes to obtain a diluent, trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 were stirred at 40°C for 20 minutes to obtain a curing agent, the accelerator was 2,4,6-tris(dimethylaminomethyl)phenol, and the filler consisted of limestone ore powder and 150 mesh silanized rubber powder in a mass ratio of 10:1.

[0091] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0092] Comparative Example 9

[0093] The diluent was obtained by stirring polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of 8:1:0.8 at 40°C for 15 minutes, and the curing agent was obtained by stirring trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionate and polyetheramine in a mass ratio of 7:1:1 at 40°C for 20 minutes. The accelerator was 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:0.6. The filler consisted of limestone powder and 150 mesh unmodified rubber powder in a mass ratio of 10:1.

[0094] The diluent, epoxy resin and curing agent with a molar ratio of 1.62:1:0.32 were dissolved in each other, stirred and reacted at 60°C for 10 minutes, cooled to room temperature, and an accelerator accounting for 1% of the total weight of the diluent, epoxy resin and curing agent was added and stirred for 10 minutes to obtain an epoxy resin binder. Subsequently, the filler and epoxy resin binder with a mass ratio of 1.1:1 were stirred at 300 rpm for 300 seconds at room temperature and then at 500 rpm for 300 seconds to prepare a wide temperature range epoxy resin binder.

[0095] Comparative Example 10

[0096] Commercially available road polyether one-component polyurethane is used as the binder.

[0097] According to the preparation methods of Examples 1 to 3 and Comparative Examples 1 to 7, 10 groups of epoxy resin binder samples were prepared, each group of samples having the same size and shape. The following tests were conducted:

[0098] (1) The dynamic mechanical parameters of the sample were measured using a dynamic thermomechanical analyzer to obtain the high elastic service temperature range and the dynamic modulus at 25°C of the sample.

[0099] (2) With reference to GB / T 5210-2006 “Paints and varnishes adhesion test by pull-off method”, the adhesive and rubber adhesion test at 25°C was carried out on the specimens and the pull-off strength of the specimens was recorded.

[0100] (3) Refer to GB / T 1681-2009 “Determination of rebound elasticity of vulcanized rubber” and conduct a rebound elasticity test on the sample at 25℃ and record the rebound value of the test.

[0101] (4) Use a rotational viscometer to test the rotational viscosity at 25°C and record the corresponding viscosity value.

[0102] (5) An isothermal curing test of the sample at 25°C was performed using a differential scanning calorimeter, and the corresponding gel time was recorded.

[0103] The results are shown in Table 1:

[0104] Table 1 Performance test results of epoxy resin binder in wide temperature range

[0105]

[0106]

[0107] As shown in Table 1, Comparative Example 1, which used only polypropylene glycol diglycidyl ether as a diluent, exhibited significantly lower pull-out strength and dynamic modulus. This is due to the high flexibility of the long-chain ether bonds in polypropylene glycol diglycidyl ether, which reduced the crosslink density of the binder. Comparative Example 2, which used only pentaerythritol tetrakis-3-mercaptopropionate as a curing agent, exhibited a significantly narrowed high-elasticity service temperature range, decreased rebound resilience and gel time, and increased strength. This is due to the high crosslink density provided by the tetramercapto structure of pentaerythritol tetrakis-3-mercaptopropionate, demonstrating the essential synergy of the flexible amine groups. Comparative Example 3 used excessive amounts of rubber powder filler, resulting in excessive binder viscosity and difficulty in mixing. Comparative Example 4 used excessive amounts of diluent, resulting in decreased binder viscosity and a significant increase in gel time, which could easily lead to binder segregation. Insufficient curing agent in Comparative Example 5 resulted in an incomplete reaction, preventing the formation of a uniform binder. In Comparative Example 6, excessive amounts of accelerator caused the reaction to proceed too quickly, resulting in insufficient time for application. Comparative Example 7 uses only phenyl glycidyl ether diluent, resulting in a significant decrease in the viscosity of the binder and easy segregation problems. Comparative Example 8 uses only 2,4,6-tris(dimethylaminomethyl)phenol as a accelerator, resulting in a significant decrease in gel time, indicating that 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol have a synergistic regulatory effect on construction time. Comparative Example 9 uses rubber powder that has not been treated with a silane coupling agent as a filler, and its overall mechanical properties show a significant decrease. Comparative Example 10 is a road polyurethane binder. In comparison, Examples 1-3 have a wider high-elastic service temperature range and better adhesion with rubber particles. While ensuring dynamic modulus and rebound performance matching those of rubber, they also have good construction and workability.

[0108] In summary, the wide-temperature range epoxy resin binder of this embodiment has good adhesion to both rubber and stone, and has a pavement service temperature range that is highly matched with the mechanical properties of rubber aggregate, thereby improving the durability of the rubber elastic pavement.

[0109] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A method for preparing an epoxy resin binder for elastic pavement, characterized in that: Including steps: S1. Dissolve a diluent, an epoxy resin, and a curing agent in a molar ratio of (1-2.5):1:(0.23-0.4) and stir to react. After the reactant is cooled to room temperature, add an accelerator and stir to obtain an epoxy resin binder; wherein the weight of the accelerator accounts for 0.8-1.4% of the total weight of the diluent, the epoxy resin, and the curing agent; S2. Stir the filler and the epoxy resin binder in a mass ratio of (0.7-1.4):1 to obtain an epoxy resin binder.

2. The method for preparing an epoxy resin binder for elastic pavement according to claim 1, characterized in that: The epoxy resin includes bisphenol A epoxy resin, and the epoxy equivalent of the bisphenol A epoxy resin is 185-230 g / mol and the density is 1.15-1.2 g / cm 3 .

3. The method for preparing an epoxy resin binder for elastic pavement according to claim 1, wherein: The diluent is prepared by stirring polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether and phenyl glycidyl ether in a mass ratio of (4.5-9):1:(0.5-1) at 30-50 DEG C.

4. The method for preparing an epoxy resin binder for elastic pavement according to claim 1, wherein: The curing agent is prepared by stirring trimethylolpropane tris(3-mercaptopropionic acid), pentaerythritol tetrakis-3-mercaptopropionic acid ester and polyetheramine at a mass ratio of (6-8):1:(0.5-1.5) at 30-50 DEG C.

5. The method for preparing an epoxy resin binder for elastic pavement according to claim 1, wherein: The accelerator comprises 1-cyanoethyl-2-ethyl-4-methylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol in a mass ratio of 1:(0.5-0.8).

6. The method for preparing an epoxy resin binder for elastic pavement according to claim 1, characterized in that: The filler includes modified rubber powder and limestone powder, wherein: The modified rubber powder is obtained by surface treating rubber powder with a silane coupling agent; The mass of the modified rubber powder is less than or equal to 20% of the mass of the limestone powder.

7. The method for preparing an epoxy resin binder for elastic pavement according to claim 1, characterized in that: Step S1 includes: A diluent, epoxy resin and curing agent in a molar ratio of (1-2.5):1:(0.23-0.4) are dissolved in each other and stirred at 50-70°C for 10-20 minutes. After the reactant is cooled to room temperature, an accelerator is added and stirred for 5-10 minutes to obtain an epoxy resin binder.

8. The method for preparing an epoxy resin binder for elastic pavement according to claim 1, characterized in that: Step S2 includes: At room temperature, the filler and the epoxy resin binder in a mass ratio of (0.7-1.4):1 are first stirred at 300-500 rpm for 300-420 s, and then stirred at 500-1000 rpm for 300-420 s to obtain the epoxy resin binder.

9. An epoxy resin binder for elastic pavement, characterized in that: include: Filler and epoxy resin binder with a mass ratio of (0.7-1.4):1, wherein: The raw materials of the epoxy resin binder include diluent, epoxy resin, curing agent and accelerator; The molar ratio of the diluent, the epoxy resin, and the curing agent is (1-2.5):1:(0.23-0.4); The weight of the accelerator accounts for 0.8-1.4% of the total weight of the diluent, the epoxy resin and the curing agent.

10. The epoxy resin binder for elastic pavement according to claim 9, characterized in that: The epoxy resin binder has a high elastic service temperature greater than or equal to -25°C, a viscosity of 2 to 30 Pa·s, and a gel time greater than or equal to 1 hour.

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