High-temperature-resistant high-viscosity rubber asphalt and preparation method thereof

Abstract

The invention relates to high-temperature-resistant high-viscosity rubber asphalt and a preparation method thereof, and relates to the technical field of elastomer modified asphalt, the high-temperature-resistant high-viscosity rubber asphalt comprises the following components by mass: 90-100 parts of asphalt, 30-40 parts of an elastomer modifier, 4-6 parts of tackifying resin, 5-10 parts of a plasticizer, 0.5-1 part of a cross-linking agent, 20-30 parts of a filler, and 0.5-1 part of an antioxidant. The preparation method comprises the following steps: pre-melting and blending tackifying resin and an elastomer modifier to obtain a molten premix; heating and melting asphalt, adding the molten premix and the plasticizer, heating, shearing and mixing, adding the filler and the antioxidant, stirring, preserving heat, and discharging to obtain the high-temperature-resistant high-viscosity rubber asphalt. The high-temperature-resistant rubber asphalt has the effect of improving the high-temperature-resistant performance of the rubber asphalt, and the asphalt has high adhesion performance.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of elastomer modified asphalt, in particular to a high-temperature-resistant and high-viscosity rubber asphalt and a preparation method thereof. BACKGROUND

[0002] With the continuous development of transportation construction and the gradual improvement of road performance requirements, it is crucial to improve the performance of asphalt materials. High-quality asphalt materials not only prolong the service life of roads and reduce maintenance costs, but also improve the safety and comfort of driving. In extreme climate conditions, such as high-temperature regions, the high-temperature resistance of asphalt materials is more stringent; at the same time, in high-load traffic sections, high-viscosity asphalt materials can better resist the deformation caused by vehicle loads. Therefore, the development of high-performance asphalt materials has become a research hotspot in this field, and many research teams and enterprises are constantly exploring new technologies and methods to improve the performance of asphalt.

[0003] To improve the performance of asphalt, there are various means commonly used. One common method is to add a single modifier, such as ordinary rubber powder, to the base asphalt, and to expect to improve some performance of the asphalt by simple stirring and mixing. This method is relatively simple to operate and has low cost, but the modification effect is limited. Another means is to physically modify the base asphalt, for example, by using heating, stirring, and other methods to change the physical state of the asphalt to improve its flowability and adhesion. In addition, there are some technologies that adjust the chemical composition of the base asphalt and add some chemical additives to improve the performance of the asphalt, but the selection and use of these additives need precise control, otherwise they may have a negative impact on other properties of the asphalt.

[0004] However, the existing technology has obvious defects. Conventional modification methods cannot simultaneously achieve high-temperature resistance and high viscosity of asphalt. The addition of a single modifier and simple physical modification methods cannot make the asphalt maintain good performance in high-temperature environments, and it is prone to softening, flowing, and other phenomena, resulting in a decrease in the road's resistance to deformation. Although the use of chemical additives can improve the performance of asphalt to some extent, due to the limitations of their composition and addition amount, it is difficult to achieve the desired comprehensive effect of high-temperature resistance and high viscosity, and therefore needs to be improved. SUMMARY

[0005] To solve the above problems, the application provides a high-temperature-resistant and high-viscosity rubber asphalt and a preparation method thereof.

[0006] The high-temperature-resistant and high-viscosity rubber asphalt and the preparation method thereof provided by the application adopt the following technical solutions: In a first aspect, the application provides a high-temperature-resistant and high-viscosity rubber asphalt, which adopts the following technical solutions: A high-temperature-resistant and high-viscosity rubber asphalt comprises the following components in mass fraction: Asphalt 90-100 parts Elastomer modifier 30-40 parts Tackifying resin 4-6 parts Plasticizer 5-10 parts Crosslinking agent 0.5-1 part Filler 20-30 parts Antioxidant 0.5-1 part The elastomer modifier is prepared by the following steps: The polyamide is melt plasticized, the composite elastomer is added, heated, stirred and sheared to blend, the di-tert-butyl peroxyisopropylbenzene is added, heated, stirred and sheared to blend, after the reaction is completed, extrusion, traction, cooling, granulation and drying are performed to obtain the elastomer modifier.

[0007] By using the thermoplastic elastomer formed by taking the polyamide as the continuous phase and the composite elastomer as the dispersed phase and dynamically vulcanized as the core modifier, a stable three-dimensional network structure is constructed in the asphalt, in which the polyamide provides a heat-resistant skeleton, the crosslinked rubber particles endow the system with elasticity and viscosity, the tackifying resin enhances the interfacial wetting and adhesion, the crosslinking agent further promotes the formation of chemical bonds among the components, and the filler plays a role in reinforcement and tackification, so that the high-temperature resistance and high adhesion of the rubber asphalt are improved through the synergistic effect of multiple components.

[0008] Preferably, the composite elastomer comprises activated rubber powder, styrene-butadiene rubber and ethylene-propylene-diene rubber.

[0009] By limiting the composite elastomer to be composed of activated rubber powder, styrene-butadiene rubber and ethylene-propylene-diene rubber, a multi-component synergistic elastomer mixed system is constructed, in which the activated rubber powder provides basic elastic recovery and cost advantage, the styrene-butadiene rubber contributes good adhesion performance and flexibility, and the ethylene-propylene-diene rubber enhances the thermal stability of the system due to its excellent heat resistance and aging resistance, so that the high-temperature resistance and adhesion of the rubber asphalt are improved through the complementary advantages of the three components.

[0010] Preferably, the mass ratio of the activated rubber powder, the styrene-butadiene rubber and the ethylene-propylene-diene rubber is 1:0.8:(0.6-1).

[0011] By optimizing the mass ratio of the three elastomer components, the activated rubber powder serves as the basic elastic network skeleton, the styrene-butadiene rubber plays its good cohesive and adhesive properties, and the ethylene-propylene-diene rubber provides heat resistance support due to its stable molecular structure, so that a synergistic system is formed through mutual penetration of the three components within the ratio range, which not only ensures sufficient crosslinking density but also maintains suitable interfacial compatibility, thereby promoting the structural stability of the rubber asphalt under high temperature conditions and the persistent adhesion to aggregate.

[0012] Preferably, the mass ratio of the polyamide, the composite elastomer and the di-tert-butyl peroxide isopropyl benzene is (0.6-1.4):1:0.02.

[0013] By controlling the mass ratio of the polyamide, the composite elastomer and the crosslinking agent, the polyamide forms a continuous heat-resistant skeleton structure, and the composite elastomer forms a dispersed phase with moderate crosslinking under the action of the crosslinking agent. This phase structure not only maintains the thermal stability of the polyamide phase, but also enhances the cohesive force and elastic recovery characteristics of the material through the crosslinked elastomer particles, thereby synergistically improving the high-temperature resistance and adhesion durability of the rubber asphalt.

[0014] Preferably, the tackifying resin comprises terpene phenolic resin and hydrogenated rosin glycerin ester.

[0015] By using the tackifying system composed of terpene phenolic resin and hydrogenated rosin glycerin ester, the rigid skeleton of the terpene phenolic resin provides heat-resistant support, and the ester group structure of the hydrogenated rosin glycerin ester improves the interfacial compatibility and enhances the initial adhesion, and the two synergistically form a stable adhesion network in the asphalt system, thereby synergistically improving the high-temperature resistance and adhesion durability of the rubber asphalt.

[0016] Preferably, the mass ratio of the terpene phenolic resin and the hydrogenated rosin glycerin ester is 1:(0.45-0.65).

[0017] By controlling the ratio of the terpene phenolic resin and the hydrogenated rosin glycerin ester, the rigid structure of the terpene phenolic resin and the flexible long chain of the hydrogenated rosin glycerin ester are complementary, the former provides heat-resistant skeleton support, and the latter improves interfacial wetting and flexibility adjustment, and the two synergistically enhance the cohesive strength and interfacial adhesion of the resin system, thereby synergistically improving the high-temperature resistance and adhesion durability of the rubber asphalt.

[0018] Preferably, the tackifying resin is modified and prepared by the following steps: The tackifying resin is melt blended, maleic anhydride and an initiator are added under a protective atmosphere, heated and stirred to react, γ-aminopropyl triethoxysilane is added, heated and stirred to react, cooled, granulated and dried to obtain the modified tackifying resin.

[0019] By chemically modifying the tackifying resin, maleic anhydride is grafted to the resin molecular chain under the action of the initiator to introduce polar groups, and then through the bridging action of γ-aminopropyl triethoxysilane, the chemical bonding ability of the resin with the asphalt matrix is enhanced, and the interfacial interaction with the aggregate surface is improved, thereby improving the high-temperature resistance and adhesion durability of the rubber asphalt by constructing a more stable interfacial adhesion layer.

[0020] Preferably, the mass ratio of the tackifying resin, maleic anhydride and γ-aminopropyl triethoxysilane is 1:0.05:(0.1-0.2).

[0021] By controlling the mass ratio of each reaction component in the tackifying resin modification process, the graft modification degree of maleic anhytic is reasonably regulated, and at the same time, the effective interface bridging network of γ-aminopropyl triethoxysilane in the resin system is ensured, which not only enhances the chemical bonding force between the resin molecules and the asphalt matrix, but also improves the interface bonding effect with the mineral aggregate, thereby synergistically improving the high-temperature resistance and adhesion durability of the rubber asphalt.

[0022] Preferably, the filler includes carbon black, diatomite and organically modified montmorillonite.

[0023] By using the filler system composed of carbon black, diatomite and organically modified montmorillonite, the structural integrity of the material is enhanced by the reinforcing characteristics of carbon black, the viscosity and stability of the system are improved by the porous structure of diatomite, and the barrier and reinforcing effects of the layered structure of organically modified montmorillonite are played, so that the three fillers form a synergistic reinforcing network in the system, and together promote the improvement of the high-temperature resistance and adhesion of the rubber asphalt.

[0024] In the second aspect, the application provides a preparation method of high-temperature-resistant and high-viscosity rubber asphalt, which adopts the following technical scheme: A preparation method of high-temperature-resistant and high-viscosity rubber asphalt, comprising the following steps: The tackifying resin and the elastomer modifier are pre-melted and blended to obtain a molten premix; the asphalt is heated and melted, the molten premix and the plasticizer are added, and the mixture is heated and sheared, then the filler and the antioxidant are added, stirred and kept warm, and then discharged to obtain the high-temperature-resistant and high-viscosity rubber asphalt.

[0025] By pre-melting and blending the tackifying resin and the elastomer modifier, the resin phase is fully wrapped around the surface of the modifier to form a transition layer, which promotes the interface compatibility when mixed with the asphalt matrix in the subsequent process; the heating and shearing process helps the uniform dispersion and combination of the elastomer network in the asphalt, and the filler particles form a stable composite structure with the polymer phase in the heat preservation stage, thereby synergistically improving the high-temperature resistance and adhesion durability of the rubber asphalt.

[0026] In summary, the application includes at least one of the following beneficial technical effects: By using the thermoplastic elastomer formed by using polyamide as the continuous phase, composite elastomer as the dispersed phase and dynamic vulcanization as the core modifier, a stable three-dimensional network structure is constructed in the asphalt, in which the polyamide provides a heat-resistant skeleton, the cross-linked rubber particles impart elasticity and viscosity to the system, the tackifying resin enhances the interface wetting and adhesion, and the cross-linking agent further promotes the formation of chemical bonds between the components, and the filler plays a reinforcing and tackifying role, so that the various components synergistically improve the high-temperature resistance and high adhesion of the rubber asphalt.

[0027] By limiting the composite elastomer to be composed of activated rubber powder, styrene-butadiene rubber and ethylene-propylene-diene rubber, a multi-component synergistic elastomer mixing system is constructed, in which the activated rubber powder provides basic elastic recovery and cost advantage, the styrene-butadiene rubber contributes good bonding performance and flexibility, and the ethylene-propylene-diene rubber enhances the thermal stability of the system with its excellent heat resistance and aging resistance, and the three complement each other to promote the improvement of the high-temperature resistance and adhesion of the rubber asphalt.

[0028] By chemically modifying the tackifying resin, maleic anhydride is grafted onto the resin molecular chain under the action of an initiator to introduce polar groups, and then through the bridging action of γ-aminopropyl triethoxysilane, the chemical bonding ability of the resin with the asphalt matrix is enhanced, and the interface interaction with the aggregate surface is improved, so as to improve the high-temperature resistance and adhesion durability of the rubber asphalt by constructing a more stable interface bonding layer. DETAILED DESCRIPTION

[0029] The application discloses a kind of high-temperature-resistant high-viscosity rubber asphalt and preparation method thereof, raw materials used in the application can be obtained by commercially available raw materials except special instructions, the following will be further detailed in the application by combining with examples: Raw material description: activated rubber powder is purchased from Hubei Haitu Environmental Protection New Material Technology Co., Ltd., styrene-butadiene rubber powder is purchased from Dongguan Shenghao Plastic Raw Material Co., Ltd., ethylene-propylene-diene rubber is purchased from Dongguan Baogia Plastic Co., Ltd., the polyamide brand is Leona™ 1402S, purchased from Suzhou Xuanji New Material Co., Ltd., di-tert-butyl peroxide isopropyl benzene (CAS number: 25155-25-3), terpene phenol resin and hydrogenated rosin glyceride are purchased from Jiangsu Puleisi Biological Technology Co., Ltd., naphthenic oil A1020 is purchased from Shandong Zhuyou Lubricating Technology Co., Ltd., diethylene triamine (CAS number: 111-40-0), carbon black N550 is purchased from Shandong Wanhuatianhe New Material Co., Ltd., diatomite is purchased from Chengdu Dinghengda Chemical Product Co., Ltd., organic modified montmorillonite is purchased from Lingshou County Zhongxin Mineral Product Processing Factory, antioxidant 1010 is purchased from Hebei Kuooyu Chemical Technology Co., Ltd., maleic anhydride (CAS number: 108-31-6), γ-aminopropyl triethoxysilane (CAS number: 919-30-2), and dicumyl peroxide (CAS number: 80-43-3). Example 1

[0030] Preparation of elastomer modifier The composite elastomer is composed of activated rubber powder, styrene-butadiene rubber and ethylene-propylene-diene rubber in a mass ratio of 1:0.8:0.6, the styrene-butadiene rubber is 200-mesh styrene-butadiene rubber powder, and the ethylene-propylene-diene rubber is 8120E from Japan Synthetic Chemical Industry Co., Ltd.; the mass ratio of the polyamide, the composite elastomer and the di-tert-butyl peroxide isopropyl benzene is 0.6:1:0.02, and the polyamide is Leona™ 1402S.

[0031] The polyamide is vacuum dried at 120℃ for 4h to obtain dried polyamide; the dried polyamide is melt plasticized at 230℃, the composite elastomer is added, and shear blending is performed at 235℃ for 5min at a speed of 200rpm, the di-tert-butyl peroxide isopropyl benzene is added, and shear reaction is performed at 230℃ for 8min at a speed of 300rpm, after the reaction is completed, extrusion, traction, water cooling at 25℃, and granulation are performed, and hot air drying is performed at 80℃ to obtain the elastomer modifier.

[0032] Preparation of high-temperature-resistant and high-viscosity rubber asphalt The asphalt, the elastomer modifier, the tackifying resin, the plasticizer, the crosslinking agent, the filler and the antioxidant are weighed in a mass ratio of 90:30:4:5:0.5:20:0.5; the asphalt is petroleum asphalt 70, the tackifying resin is composed of terpene phenolic resin and hydrogenated rosin glyceride in a mass ratio of 1:0.45, the plasticizer is naphthenic oil A1020, the crosslinking agent is diethylenetriamine, the filler is composed of carbon black (N550), diatomite and organically modified montmorillonite in a mass ratio of 1:0.25:0.15, and the antioxidant is antioxidant 1010.

[0033] The tackifying resin and the elastomer modifier are pre-melt blended at 170℃ to obtain a molten pre-mixture; the asphalt is heated to 170℃ to be molten, the molten pre-mixture and the plasticizer are added, shear mixing is performed at 190℃ for 40min at a speed of 2500rpm, the temperature is lowered to 165℃, the filler, the crosslinking agent and the antioxidant are added, stirring is performed at 500rpm for 20min, and incubation is performed at 160℃ for 2h, and the product is discharged to obtain the high-temperature-resistant and high-viscosity rubber asphalt. Example 2

[0034] Preparation of elastomer modifier The composite elastomer is composed of activated rubber powder, styrene-butadiene rubber and ethylene-propylene-diene rubber in a mass ratio of 1:0.8:1, the styrene-butadiene rubber is 200-mesh styrene-butadiene rubber powder, and the ethylene-propylene-diene rubber is 8120E from Japan Synthetic Chemical Industry Co., Ltd.; the mass ratio of the polyamide, the composite elastomer and the di-tert-butyl peroxide isopropyl benzene is 1.4:1:0.02, and the polyamide is Leona™ 1402S.

[0035] Polyamide was vacuum dried at 120℃ for 4 hours to obtain dried polyamide. The dried polyamide was melt-plasticized at 230℃, and a composite elastomer was added. The mixture was sheared and blended at 235℃ at 200 rpm for 5 minutes. Di-tert-butylperoxyisopropylbenzene was added, and the mixture was sheared and reacted at 230℃ at 300 rpm for 8 minutes. After the reaction was completed, the mixture was extruded, drawn, water-cooled and pelletized at 25℃, and dried with hot air at 80℃ to obtain an elastomer modifier.

[0036] Preparation of high-temperature resistant, high-viscosity rubber asphalt Weigh out 100 parts of asphalt, 40 parts of elastomer modifier, 6 parts of tackifying resin, 10 parts of plasticizer, 1 part of crosslinking agent, 30 parts of filler, and 1 part of antioxidant. The asphalt is petroleum asphalt 70. The tackifying resin is composed of terpene phenolic resin and hydrogenated rosin glycerol ester in a mass ratio of 1:0.65. The plasticizer is naphthenic oil A1020. The crosslinking agent is diethylenetriamine. The filler is composed of carbon black (N550), diatomaceous earth, and organically modified montmorillonite in a mass ratio of 1:0.25:0.15. The antioxidant is antioxidant 1010.

[0037] The tackifying resin and elastomer modifier were pre-melted and blended at 170°C to obtain a molten premix. The asphalt was heated to 170°C to melt, and the molten premix and plasticizer were added. The mixture was sheared and mixed at 190°C and 2500 rpm for 40 minutes. The mixture was then cooled to 165°C, and fillers, crosslinking agents, and antioxidants were added. The mixture was stirred at 500 rpm for 20 minutes and then kept at 160°C for 2 hours to develop. The mixture was then discharged to obtain high-temperature resistant, high-viscosity rubber asphalt. Example 3

[0038] Preparation of elastomer modifiers The composite elastomer is composed of activated rubber powder, styrene-butadiene rubber, and ethylene propylene diene monomer (EPDM) rubber in a mass ratio of 1:0.8:0.8. The styrene-butadiene rubber is 200-mesh styrene-butadiene rubber powder, and the EPDM rubber is of the Mitsui Chemicals 8120E grade from Japan. The mass ratio of polyamide, composite elastomer, and di-tert-butylperoxyisopropylbenzene is 1:1:0.02, and the polyamide grade is Leona™ 1402S.

[0039] Polyamide was vacuum dried at 120℃ for 4 hours to obtain dried polyamide. The dried polyamide was melt-plasticized at 230℃, and a composite elastomer was added. The mixture was sheared and blended at 235℃ at 200 rpm for 5 minutes. Di-tert-butylperoxyisopropylbenzene was added, and the mixture was sheared and reacted at 230℃ at 300 rpm for 8 minutes. After the reaction was completed, the mixture was extruded, drawn, water-cooled and pelletized at 25℃, and dried with hot air at 80℃ to obtain an elastomer modifier.

[0040] Preparation of high-temperature resistant, high-viscosity rubber asphalt The asphalt 95 parts, elastomer modifier 35 parts, tackifying resin 5 parts, plasticizer 7.5 parts, crosslinking agent 0.75 parts, filler 25 parts, antioxidant 0.75 parts; the asphalt is petroleum asphalt 70, the tackifying resin is composed of terpene phenolic resin and hydrogenated rosin glycerol ester with a mass ratio of 1:0.55, the plasticizer is naphthenic oil A1020, the crosslinking agent is diethylene triamine, the filler is composed of carbon black (N550), diatomite and organic modified montmorillonite with a mass ratio of 1:0.25:0.15, and the antioxidant is antioxidant 1010.

[0041] The tackifying resin and the elastomer modifier are pre-melted and blended at 170℃ to obtain a molten premix; the asphalt is heated to 170℃ to melt, the molten premix and the plasticizer are added, and shearing mixing is carried out at 190℃ for 40 min at a speed of 2500 rpm, the temperature is lowered to 165℃, the filler, the crosslinking agent and the antioxidant are added, stirring is carried out at a speed of 500 rpm for 20 min, and incubation is carried out at 160℃ for 2 h, and the product is discharged to obtain the high-temperature-resistant and high-viscosity rubber asphalt. Example 4

[0042] Example 4 is based on Example 3, and the difference between Example 4 and Example 3 is only that the mass ratio of the activated rubber powder, the styrene-butadiene rubber and the ethylene-propylene-diene rubber in the composite elastomer when preparing the elastomer modifier in Example 4 is 1:0.8:0.4. Example 5

[0043] Example 5 is based on Example 3, and the difference between Example 5 and Example 3 is only that the mass ratio of the activated rubber powder, the styrene-butadiene rubber and the ethylene-propylene-diene rubber in the composite elastomer when preparing the elastomer modifier in Example 5 is 1:0.8:1.2. Example 6

[0044] Example 6 is based on Example 3, and the difference between Example 6 and Example 3 is only that no styrene-butadiene rubber is added to the composite elastomer when preparing the elastomer modifier in Example 6, and the composite elastomer is composed of activated rubber powder and ethylene-propylene-diene rubber with a mass ratio of 1:0.8. Example 7

[0045] Example 7 is based on Example 3, and the difference between Example 7 and Example 3 is only that the mass ratio of the polyamide, the composite elastomer and the bis-tert-butyl peroxyisopropyl benzene when preparing the elastomer modifier in Example 7 is 0.2:1:0.02. Example 8

[0046] Example 8 is based on Example 3, and the difference between Example 8 and Example 3 is only that the mass ratio of the polyamide, the composite elastomer and the bis-tert-butyl peroxyisopropyl benzene when preparing the elastomer modifier in Example 8 is 2:1:0.02. Example 9

[0047] Example 9 is based on Example 3, the only difference between Example 9 and Example 3 being that in Example 9 the mass ratio of terpene phenolic resin to hydrogenated rosin glycerides in the tackifying resin is 1 :0.3. Example 10

[0048] Example 10 is based on Example 3, the only difference between Example 10 and Example 3 being that in Example 10 the mass ratio of terpene phenolic resin to hydrogenated rosin glycerides in the tackifying resin is 1 :0.8. Example 11

[0049] Example 11 is based on Example 3, the only difference between Example 11 and Example 3 being that in Example 11 the tackifying resin is only terpene phenolic resin. Example 12

[0050] Example 12 is based on Example 11, the only difference between Example 12 and Example 11 being that in Example 12 the tackifying resin is modified, prepared using the following steps: The mass ratio of tackifying resin, maleic anhydride and γ-aminopropyl triethoxysilane is 1 :0.05:0.1.

[0051] The tackifying resin is melt blended at 160°C, maleic anhydride and initiator (dicumyl peroxide, 0.3% by mass of the tackifying resin) are added under a nitrogen atmosphere, and the reaction is stirred at 160°C at 200 rpm for 2 h, γ-aminopropyl triethoxysilane is added, and the reaction is stirred at 160°C at 200 rpm for 40 min, and then water-cooled, granulated, and dried at 60°C to obtain the modified tackifying resin. Example 13

[0052] Example 13 is based on Example 11, the only difference between Example 13 and Example 11 being that in Example 13 the mass ratio of tackifying resin, maleic anhydride and γ-aminopropyl triethoxysilane is 1 :0.05:0.2 when preparing the modified tackifying resin. Example 14

[0053] Example 14 is based on Example 11, the only difference between Example 14 and Example 11 being that in Example 14 the mass ratio of tackifying resin, maleic anhydride and γ-aminopropyl triethoxysilane is 1 :0.05:0.15 when preparing the modified tackifying resin. Example 15

[0054] Example 15 is based on Example 11, the only difference between Example 15 and Example 11 being that in Example 15 the mass ratio of tackifying resin, maleic anhydride and γ-aminopropyl triethoxysilane is 1 :0.05:0.05 when preparing the modified tackifying resin. Example 16

[0055] Example 16 is based on Example 3, and the difference between Example 16 and Example 3 is only that the mass ratio of the tackifying resin, maleic anhydride and γ-aminopropyl triethoxysilane is 1:0.05:0.25 when preparing the modified tackifying resin in Example 16.

[0056] Comparative Example 1 The polyamide is not added when preparing the elastomer modifier in Comparative Example 1, and the following steps are used to prepare the elastomer modifier: The composite elastomer is composed of the activated rubber powder, the styrene butadiene rubber and the ethylene propylene diene rubber in a mass ratio of 1:0.8:0.8, the styrene butadiene rubber is a 200-mesh styrene butadiene rubber powder, and the ethylene propylene diene rubber is a product of Mitsui Chemicals, Japan, with a model number of 8120E; the mass ratio of the composite elastomer and the di-tert-butyl peroxide isopropyl benzene is 1:0.02.

[0057] The composite elastomer is plasticized at 160℃, and after being evenly wrapped on the roll, the di-tert-butyl peroxide isopropyl benzene is added, and after being dispersed by thin passing and rolling, the shear reaction is carried out at 230℃ at a speed of 300 rpm for 8 min, after the reaction is completed, the elastomer modifier is obtained by extruding, pulling, water cooling at 25℃ and drying with hot air at 80℃.

[0058] Comparative Example 2 The di-tert-butyl peroxide isopropyl benzene is not added when preparing the elastomer modifier in Comparative Example 2.

[0059] The composite elastomer is composed of the activated rubber powder, the styrene butadiene rubber and the ethylene propylene diene rubber in a mass ratio of 1:0.8:0.8, the styrene butadiene rubber is a 200-mesh styrene butadiene rubber powder, and the ethylene propylene diene rubber is a product of Mitsui Chemicals, Japan, with a model number of 8120E; the mass ratio of the polyamide and the composite elastomer is 1:1.

[0060] The polyamide is dried in vacuum at 120℃ for 4 h to obtain the dried polyamide; the dried polyamide is melt plasticized at 230℃, and the composite elastomer is added to carry out shear blending at 235℃ at a speed of 200 rpm for 10 min, and the elastomer modifier is obtained by extruding, pulling, water cooling at 25℃ and drying with hot air at 80℃. Performance detection test

[0061] (1) The standard of JTG F40-2004 Technical Specification for Construction of Highway Asphalt Pavement is selected, three samples of each sample are prepared, the anti-rutting performance detection is carried out, the dynamic stability of the sample is detected at 60℃ with a wheel pressure of 0.7 MPa, the average value is measured after detection, and the results are recorded in Table 1.

[0062] (2) Select JTG E20-2011 Highway Engineering Asphalt and Asphalt Mixture Test Procedures as the standard, three test pieces are prepared for each sample, immersion Marshall test and freeze-thaw splitting test are carried out, immersion residual stability ratio and freeze-thaw splitting strength ratio are calculated and recorded, average value is taken after measurement, and the results are recorded in Table 1.

[0063] Table 1 Test results of high temperature resistance and adhesion of rubber asphalt Test results High temperature dynamic stability (times) Immersion residual stability ratio (%) Freeze-thaw splitting strength ratio (%) Example 1 8505 86.5 85.9 Example 2 8875 88.2 86.7 Example 3 8955 89.3 88.1 Example 4 7650 85.2 83.7 Example 5 8455 86.4 85.3 Example 6 8320 82.5 80.9 Example 7 7250 83.6 81.4 Example 8 8845 85.5 84.0 Example 9 8820 85.4 83.9 Example 10 8795 86.5 87.2 Example 11 8580 84.2 83.5 Example 12 8920 91.8 90.5 Example 13 8980 93.5 92.1 Example 14 9055 92.8 91.4 Example 15 8840 89.7 88.2 Example 16 8875 90.1 89.5 Comparative Example 1 4520 76.8 74.3 Comparative Example 2 5830 81.2 79.6 As can be seen from Table 1, the high temperature dynamic stability of Examples 1-3 is greater than 8505 times, the immersion residual stability ratio is greater than 86.5%, and the freeze-thaw splitting strength ratio is greater than 85.9%, so it can be seen that the rubber asphalt prepared in the application has good high temperature resistance and high adhesion.

[0064] As can be seen from Table 1, the difference between Examples 4, 5, 6 and Example 3 is only that the composition ratio of the composite elastomer in the preparation of the elastomer modifier is destroyed in Examples 4 and 5. Too little EPDM rubber can lead to insufficient crosslinking density, and too much can affect the compatibility, so the performance decreases.

[0065] As can be seen from Table 1, the difference between Examples 7 and 8 and Example 3 is only that the component ratio in the preparation of the elastomer modifier is destroyed in Examples 7 and 8. Too little polyamide cannot form a complete continuous phase, and too much polyamide can affect the elasticity and adhesion, so the performance decreases.

[0066] As can be seen from Table 1, the difference between Examples 9-11 and Example 3 is only that the compounding ratio of tackifying resin is destroyed in Examples 9 and 10, which affects the balance of the synergistic effect of the two, and the performance decreases. Example 11 only adds terpene phenol resin, which destroys the synergistic effect of the two, and the performance decreases significantly.

[0067] As can be seen from Table 1, the difference between Examples 12-16 and Example 3 is only that the tackifying resin is modified according to the limited ratio in Examples 12-14, which effectively enhances the interface interaction and improves the performance. The performance improvement effect of Examples 15 and 16 is decreased due to the destruction of the limited ratio.

[0068] As can be seen from Table 1, the difference between Comparative Examples 1 and 2 and Example 3 is only that there is no polyamide continuous phase in Comparative Example 1, and the material structure integrity is destroyed, and there is no further crosslinking effect in Comparative Example 2, and the performance is significantly deteriorated.

[0069] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A high-temperature resistant, high-viscosity rubber asphalt, characterized in that: The components include the following parts by mass: 90-100 parts asphalt 30-40 parts of elastomer modifier 4-6 parts of tackifying resin 5-10 parts plasticizer Crosslinking agent 0.5-1 part 20-30 parts of filler Antioxidant 0.5-1 part; The elastomer modifier is prepared using the following steps: Polyamide is melt-plasticized, and a composite elastomer is added. The mixture is heated, stirred, and sheared. Then, bis-tert-butylperoxyisopropylbenzene is added, and the mixture is heated, stirred, and sheared. After the reaction is complete, the mixture is extruded, drawn, cooled, granulated, and dried to obtain the elastomer modifier.

2. The high-temperature resistant, high-viscosity rubber asphalt according to claim 1, characterized in that: The composite elastomer includes activated rubber powder, styrene-butadiene rubber, and ethylene propylene diene monomer (EPDM) rubber.

3. The high-temperature resistant, high-viscosity rubber asphalt according to claim 2, characterized in that: The mass ratio of the activated rubber powder, styrene-butadiene rubber, and ethylene propylene diene monomer (EPDM) rubber is 1:0.8:(0.6-1).

4. The high-temperature resistant, high-viscosity rubber asphalt according to claim 3, characterized in that: The mass ratio of the polyamide, composite elastomer and bis-tert-butylperoxyisopropylbenzene is (0.6-1.4):1:0.

02.

5. The high-temperature resistant, high-viscosity rubber asphalt according to claim 1, characterized in that: The tackifying resin includes terpene phenolic resin and hydrogenated rosin glycerol ester.

6. The high-temperature resistant, high-viscosity rubber asphalt according to claim 5, characterized in that: The mass ratio of the terpene phenolic resin to the hydrogenated rosin glycerol ester is 1:(0.45-0.65).

7. The high-temperature resistant, high-viscosity rubber asphalt according to claim 6, characterized in that: The tackifying resin is modified and prepared using the following steps: The tackifying resin was melt-blended, and maleic anhydride and an initiator were added under a protective atmosphere. The mixture was heated and stirred to react. Then, γ-aminopropyltriethoxysilane was added, and the mixture was heated and stirred to react. The mixture was then cooled, granulated, and dried to obtain the modified tackifying resin.

8. The high-temperature resistant, high-viscosity rubber asphalt according to claim 7, characterized in that: The mass ratio of the tackifying resin, maleic anhydride, and γ-aminopropyltriethoxysilane is 1:0.05:(0.1-0.2).

9. The high-temperature resistant, high-viscosity rubber asphalt according to claim 1, characterized in that: The filler includes carbon black, diatomaceous earth, and organically modified montmorillonite.

10. A method for preparing high-temperature resistant, high-viscosity rubber asphalt as described in any one of claims 1-9, characterized in that: Includes the following steps: The tackifying resin and elastomer modifier are pre-melted and blended to obtain a molten premix; the asphalt is heated and melted, the molten premix and plasticizer are added, heated and sheared and mixed, fillers and antioxidants are added, stirred and kept at a constant temperature, and then discharged to obtain high-temperature resistant high-viscosity rubber asphalt.