Epoxy bitumen, process for its preparation and use thereof

Abstract

The present application belongs to the technical field of asphalt material, and particularly relates to an epoxy asphalt and a preparation method and application thereof. The epoxy asphalt is prepared from raw materials including the following components by weight: 20-30 parts of epoxy resin, 10-20 parts of curing agent, 5-10 parts of toughening agent, 3-8 parts of diluent, 30-60 parts of base asphalt, 10-20 parts of rubber powder and 0.1-1 part of activator. The epoxy asphalt material has high strength and good toughness, and guarantees that a novel large-void drainage asphalt mixture (void ratio greater than 25%) using the epoxy asphalt has significantly improved high-temperature stability, anti-flying performance and other performances, and reduces the occurrence of rutting and particle loss and other diseases.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of asphalt materials, and particularly relates to an epoxy asphalt as well as a preparation method and application thereof. BACKGROUND

[0002] The existing drainage asphalt pavement complete technology research system in China is mostly applied to provinces and regions with an average annual rainfall of less than 1500 mm and small rainfall intensity, and the use effect is verified to be relatively good after years of verification.

[0003] For southern regions, most provinces are in a subtropical monsoon climate, with high temperature and heavy rain all year round, and the average annual rainfall is more than 1500 mm. The internal water storage space of the commonly used ordinary drainage asphalt pavement (void ratio is about 22%) in China is insufficient, and the accumulated water on the road surface cannot be discharged in time, which will lead to two important problems. ① Rainwater runoff is formed on the road surface, and water floating occurs when vehicles are driving, which produces spray and splashing water, causing the vision of the following vehicles to be blocked, seriously affecting road safety. ② The water pressure generated by the water squeezed by the tires of the passing vehicles will reduce the service life of the pavement under the action of the water pressure and high temperature for a long time. A new type of large-void drainage asphalt pavement (void ratio > 25%) technology is proposed for the characteristics of high temperature and heavy rain.

[0004] Compared with the traditional drainage asphalt pavement, the new type of large-void asphalt pavement has a larger void ratio, and the embedding and extrusion effect between the aggregates is weaker. It is more prone to loose and peel off, and has problems such as insufficient durability. In the formation of the strength of the asphalt mixture, the good or bad of the bonding performance of the asphalt plays a crucial role in its performance. Therefore, it is necessary to improve the performance of the asphalt material to effectively improve the void ratio of the pavement to enhance the drainage function while ensuring the long-term durability of the pavement. SUMMARY

[0005] Epoxy asphalt has the characteristics of high strength and strong bonding ability, and is suitable for new type of large-void drainage asphalt mixture. At the same time, it is found through research that rubber powder will swell by absorbing the light components in asphalt, and desulfurization and degradation of rubber molecules will occur during the swelling process. After swelling, the properties of raw rubber can be restored, and a large amount of network structure and a small amount of chain structure are formed, forming a continuous phase in the asphalt, thereby improving the flexibility of the asphalt. Therefore, rubber powder is added in the process of preparing epoxy asphalt to further improve the flexibility of epoxy asphalt.

[0006] On this basis, the application provides an epoxy asphalt and a preparation method and application thereof. The epoxy asphalt material has high strength and good toughness, ensures that a new type of large-void drainage asphalt mixture (void ratio is greater than 25%) using the epoxy asphalt has significantly improved high-temperature stability, anti-scattering performance and the like, and reduces the occurrence of rutting and particle loss and the like diseases; the application adds rubber powder to the epoxy asphalt, thereby further improving the flexibility of the epoxy asphalt under the condition of ensuring the strength, and adds an activator to reduce the interaction force between molecular chains of the rubber powder, so that the rubber powder is fully dissolved.

[0007] Specifically, the application provides the following technical solutions:

[0008] An epoxy asphalt is prepared from raw materials including the following components: 20-30 parts by weight of epoxy resin, 10-20 parts by weight of curing agent, 5-10 parts by weight of toughening agent, 3-8 parts by weight of diluent, 30-60 parts by weight of base asphalt, 10-20 parts by weight of rubber powder and 0.1-1 part by weight of activator.

[0009] Preferably, the epoxy asphalt is prepared from raw materials including the following components: 22-24 parts by weight of epoxy resin, 13-15 parts by weight of curing agent, 7-9 parts by weight of toughening agent, 4-6 parts by weight of diluent, 30-35 parts by weight of base asphalt, 17-20 parts by weight of rubber powder and 0.3-0.7 part by weight of activator. The application finds that, when the epoxy asphalt uses the raw materials with the above-mentioned components and amounts, the components in the raw materials synergistically act with other components, thereby significantly improving the stability, anti-dispersion performance, dynamic stability and bending tensile strain of the epoxy asphalt.

[0010] Preferably, in the epoxy asphalt, the epoxy resin is bisphenol A type epoxy resin.

[0011] Preferably, in the epoxy asphalt, the curing agent is a polyamide type curing agent.

[0012] Preferably, in the epoxy asphalt, the toughening agent is selected from one or two or more of an epoxy group-terminated type toughening agent, a hydroxyl group-terminated type toughening agent, an amino group-terminated type toughening agent and a carboxyl group-terminated type toughening agent.

[0013] More preferably, the toughening agent is a di-glycidyl ether type toughening agent containing a double epoxy group at the terminal.

[0014] Preferably, in the epoxy asphalt, the diluent is an active diluent or an inactive diluent.

[0015] More preferably, the active diluent is selected from one or more of phenyl glycidyl ether, cresyl glycidyl ether, n-butyl glycidyl ether, styrene oxide, glycerol triglycidyl ether, glycidyl methacrylate; the inactive diluent is selected from one or more of xylene, dibutyl benzoate, dioctyl phthalate, styrene, diallyl phthalate, dibutyl phthalate.

[0016] Further preferably, the diluent is cresyl glycidyl ether.

[0017] Preferably, in the above-mentioned epoxy asphalt, the rubber powder is waste tire rubber powder, and more preferably, the particle size is 30-50 mesh.

[0018] Preferably, in the above-mentioned epoxy asphalt, the activator is selected from one or more of rubber activator 450, rubber activator 480, n-dodecanethiol, phenol disulfide, alkyl phenol disulfide, 4-methyl phenol disulfide.

[0019] More preferably, the activator is n-dodecanethiol.

[0020] The present application also provides a preparation method of the above-mentioned epoxy asphalt, comprising the following steps:

[0021] (1) heating base asphalt to 140-160 ℃, adding rubber powder into the base asphalt, stirring for 20-40 min at a stirring rate of 250-350 r / min, and then shearing for 20-40 min by a shearing machine at a shearing rate of 2500-3500 r / min;

[0022] (2) heating epoxy resin and curing agent to 55-65 ℃;

[0023] (3) adding epoxy resin, curing agent, toughening agent, diluent and activator into the mixture obtained in step (1), and then stirring for 3-7 min at 140-160 ℃ at a stirring rate of 1500-2500 r / min.

[0024] The present application also provides application of the above-mentioned epoxy asphalt or the epoxy asphalt prepared by the above-mentioned preparation method in preparation of drainage asphalt mixture, and preferably, the void ratio of the drainage asphalt mixture is greater than 25%.

[0025] The present application also provides a drainage asphalt mixture, raw materials of which comprise the above-mentioned epoxy asphalt or the epoxy asphalt prepared by the above-mentioned preparation method, aggregate and fiber; and the aggregate gradation is preferably one of PAC-20, PAC-16, PAC-13 and PAC-10 gradation.

[0026] The present application has the following beneficial effects:

[0027] The epoxy asphalt provided by the application has the characteristics of high strength and good toughness, can significantly improve the high-temperature performance and mechanical performance of large-void drainage asphalt mixture, and can improve the problem of insufficient bonding strength between aggregates caused by large voids of the large-void drainage asphalt.

[0028] The epoxy asphalt provided by the application has the characteristics of high strength and good toughness, can significantly improve the high-temperature performance and mechanical performance of large-void drainage asphalt mixture, and can improve the problem of insufficient bonding strength between aggregates caused by large voids of the large-void drainage asphalt.

[0029] The epoxy asphalt provided by the application has the characteristics of high strength and good toughness, can significantly improve the high-temperature performance and mechanical performance of large-void drainage asphalt mixture, and can improve the problem of insufficient bonding strength between aggregates caused by large voids of the large-void drainage asphalt. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme of the application will be described clearly and completely below in combination with examples. Obviously, the described embodiments are some of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0031] In the following examples, the experimental methods used are conventional methods unless otherwise specified. In the following examples, the experimental raw materials and related equipment, etc. can be obtained from commercial channels unless otherwise specified.

[0032] Example 1

[0033] Example 1 provides an epoxy asphalt containing the following raw materials by weight: 20 parts of bisphenol A type epoxy resin E-44; 12 parts of polyamide epoxy curing agent 5125; 5 parts of diglycidyl ether type toughening agent PG-207; 3 parts of toluene-based glycidyl ether diluent 691; 50 parts of Kunlun 90# base asphalt; 10 parts of 40-mesh waste tire rubber powder; and 0.1 part of n-dodecanethiol.

[0034] The preparation method of the epoxy asphalt is as follows:

[0035] Step one: heat the base asphalt to 150 DEG C, add the 40-mesh waste tire rubber powder in proportion, turn on the stirring button, the stirring rate is 300 r / min, the stirring time is 30 min, then use a shearing machine, the shearing rate is 3000 r / min, the shearing time is 30 min, to obtain a mixture;

[0036] Step two: heat the epoxy resin and the curing agent to 60 DEG C;

[0037] Step three: add epoxy resin, curing agent, diluent and other additives to the mixture in proportion, turn on the stirring button, adjust the stirring speed to 2000 r / min, stirring time for 5 min, and stirring temperature controlled at 150℃, and then obtain the product.

[0038] Example 2

[0039] Example 2 provides an epoxy asphalt containing the following raw materials by weight: 22 parts of bisphenol A type epoxy resin E-44; 13 parts of primary amine curing agent 5125; 6 parts of diglycidyl ether toughening agent PG-207; 4 parts of toluene glycidyl ether diluent 691; 40 parts of Kunlun 90# base asphalt; 15 parts of 40 mesh waste tire rubber powder; and 0.3 parts of n-dodecanethiol.

[0040] The preparation method of the epoxy asphalt is the same as that of Example 1.

[0041] Example 3

[0042] Example 3 provides an epoxy asphalt containing the following raw materials by weight: 23 parts of bisphenol A type epoxy resin E-44; 14 parts of primary amine curing agent 5125; 8 parts of diglycidyl ether toughening agent PG-207; 5 parts of toluene glycidyl ether diluent 691; 30 parts of Kunlun 90# base asphalt; 20 parts of 40 mesh waste tire rubber powder; and 0.5 parts of n-dodecanethiol.

[0043] The preparation method of the epoxy asphalt is the same as that of Example 1.

[0044] Comparative Example 1

[0045] Comparative Example 1 provides an epoxy asphalt containing the following raw materials by weight: 23 parts of bisphenol A type epoxy resin E-44; 15 parts of primary amine curing agent 5125; 7 parts of diglycidyl ether toughening agent 207; 5 parts of toluene glycidyl ether diluent 691; 90# base asphalt 50 parts; 40 mesh waste tire rubber powder 0 parts; and n-dodecanethiol 0 parts.

[0046] The preparation method of the epoxy asphalt is the same as that of Example 1.

[0047] Comparative Example 2

[0048] Comparative Example 2 provides a high viscosity modified asphalt, the high viscosity agent is HVA high viscosity modifier from Zhonglu Jiajian (Beijing) Engineering Material Technology Co., Ltd., and the dosage is 8% of the asphalt, and the asphalt is SBS modified asphalt produced by Zhenjiang Tiannuo Asphalt Technology Co., Ltd.

[0049] Test Example

[0050] Preparation of drainage asphalt mixture: according to the general experimental procedure, the aggregate was heated to 185℃, then added into the mixing kettle, and then the epoxy asphalt prepared in the examples and the comparative examples was added, the asphalt ratio was 4.7% of the aggregate, and stirring was carried out for 90 seconds. Then the polyester fiber (the fiber content was 0.1% of the asphalt mixture) and the limestone powder (the amount of the powder was 4% of the aggregate) were added in sequence, and stirring was carried out for 90 seconds respectively. The stirring temperature was controlled at 175℃. The aggregate gradation was PAC-13 gradation.

[0051] The drainage asphalt mixture prepared from the epoxy asphalt of the examples and the comparative examples was prepared into Marshall test pieces, after the test pieces were molded at 170℃, they were placed into a constant temperature oven at 60℃ for 4 days for strength stabilization, and after curing, the Marshall stability test, the Kentucky flying test, the rutting test, and the small beam bending rheological test were carried out according to the “Highway Engineering Asphalt and Asphalt Mixture Test Regulation” (JTJ E20-2011), and the test results are shown in the following table.

[0052] Table 1: Road performance table of drainage asphalt mixture

[0053]

[0054] From the data in Table 1, it can be seen that the strength of the large void drainage asphalt mixture prepared from the HVA high viscosity modified asphalt of the comparative example 2 is not enough, and many indexes such as stability, flying, dynamic stability, and the maximum bending tensile strain when the test piece is damaged are unqualified; the performance indexes of the large void drainage asphalt mixture prepared from the epoxy asphalt of the examples 1-3 are greatly improved, and the high temperature performance and the anti-flying performance are far beyond the requirements of the specification.

[0055] The toughness of the epoxy asphalt mixture is the ability of absorbing energy in the process of plastic deformation and fracture, and in this paper, the flow value and the bending tensile strength in the small beam low temperature bending test are used to represent the toughness, the higher the flow value, the greater the strength, and the better the toughness. From the comparison of the test data, the flow value and the maximum bending tensile strain when the test piece is damaged are obviously improved by adding the 40-mesh waste tire powder, which can significantly improve the toughness of the asphalt mixture, and in a certain range, the higher the proportion of the waste tire powder, the better the toughness.

[0056] Although the present application has been described in detail in the foregoing description, specific embodiments and experiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present application. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, all belong to the scope of protection claimed by the present application.

Claims

1. A drainage asphalt mixture, characterized in that, The void ratio of the drainage asphalt mixture is greater than 25%, and the raw materials thereof include: epoxy asphalt, aggregate and fiber; The epoxy asphalt is made of raw materials including: 23 parts by weight of epoxy resin, 14 parts by weight of curing agent, 8 parts by weight of toughening agent, 5 parts by weight of diluent, 30 parts by weight of base asphalt, 20 parts by weight of rubber powder and 0.5 parts by weight of activator; The curing agent is a polyamide curing agent. The activator is n-dodecanethiol.

2. The drain asphalt mixture according to claim 1, characterized in that, The epoxy resin is a bisphenol A type epoxy resin.

3. The drain asphalt mixture according to claim 1, wherein, The toughening agent is selected from one or two or more of an epoxy-terminated toughening agent, a hydroxyl-terminated toughening agent, an amino-terminated toughening agent and a carboxyl-terminated toughening agent.

4. The drain asphalt mixture according to claim 3, characterized in that, The toughening agent is a terminal double-epoxy group-containing diglycidyl ether toughening agent.

5. The drain asphalt mixture of claim 1, wherein, The diluent is an active diluent or an inactive diluent.

6. The drain asphalt mixture according to claim 5, wherein, The active diluent is selected from one or several of phenyl glycidyl ether, tolyl glycidyl ether, n-butyl glycidyl ether, styrene oxide, glycerol triglycidyl ether and glycidyl methacrylate; and the inactive diluent is selected from one or several of xylene, dioctyl phthalate, styrene, diallyl phthalate and dibutyl phthalate.

7. The drain asphalt mixture according to claim 6, characterized in that, The diluent is tolyl glycidyl ether.

8. The drain asphalt mixture of claim 1, wherein, The rubber powder is waste tire rubber powder.

9. The drain asphalt mixture according to claim 8, characterized in that, The particle size of the rubber powder is 30-50 mesh.

10. The drain asphalt mixture according to any one of claims 1 to 9, characterized in that, The preparation method of the epoxy asphalt comprises the following steps: (1) heating the base asphalt to 140-160 ℃, adding the rubber powder into the base asphalt, stirring for 20-40 min at a stirring rate of 250-350 r / min, and then shearing for 20-40 min by using a shearing machine at a shearing rate of 2500-3500 r / min; (2) heating the epoxy resin and the curing agent to 55-65 ℃; (3) adding the epoxy resin, the curing agent, the toughening agent, the diluent and the activator into the mixture obtained in step (1), and then stirring for 3-7 min at 140-160 ℃ at a stirring rate of 1500-2500 r / min.

11. The drain asphalt mixture according to claim 10, wherein, The aggregate has one of PAC-20, PAC-16, PAC-13 and PAC-10 gradings.

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