Modified asphalt with bionic structure and preparation method thereof

Abstract

The invention discloses a preparation method of modified asphalt with a bionic structure, which comprises the following steps: S1) aminating graphene oxide to obtain GO-NH2; s2) carrying out amination on the polyester fiber, so as to obtain PET-NH2; s3) modifying the polyester fiber with isocyanate to obtain PET-NCO (polyethylene terephthalate-NCO); s4) preparation of a polyester fiber composite isocyanate terminated polyurethane prepolymer; s5) preparation of modified polyol; and S6) preparing the modified asphalt with the bionic structure, namely weighing 10-30 parts by weight of the component B and 10-20 parts by weight of the component C, stirring for 5-10 minutes, adding the mixture into 100-150 parts by weight of road asphalt, and stirring for 0.5 hour at 160 DEG C, thereby obtaining the modified asphalt with the bionic structure. By introducing aminated graphene and isocyanate modified polyester fibers, the compatibility of polyurethane and matrix asphalt can be remarkably improved, the distribution form of polyurethane in the matrix asphalt is changed, the polyurethane modified asphalt is distributed more uniformly, a net structure of a bionic structure is formed, and the material is endowed with better high and low temperature performance.

Description

Technical Field

[0001] The invention belongs to the technical field of road materials, and in particular relates to a modified asphalt with a bionic structure and a preparation method thereof. Background Art

[0002] Asphalt pavement refers to various types of pavement paved with road asphalt materials mixed into mineral materials. Asphalt binder improves the ability of paving aggregate to resist damage to the road surface caused by traffic and natural factors, making the road surface smooth, dust-free, waterproof and durable. As a commonly used pavement structure in road engineering, asphalt pavement has more stringent requirements on the low-temperature crack resistance, high-temperature rutting resistance and durability of asphalt. Existing asphalt materials are not durable enough. In extremely harsh post-season environments, they are prone to low-temperature cracking, aging cracking, potholes, high-temperature rutting and loose deformation, which seriously affect the service life of asphalt pavement. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the main purpose of the present invention is to provide a modified asphalt with a bionic structure, aiming to solve the problems of poor high temperature stability, low temperature cracking and insufficient durability of the existing asphalt. The present invention also provides a preparation method of the modified asphalt with a bionic structure.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A method for preparing modified asphalt with a bionic structure comprises the following steps:

[0006] S1) aminate graphene oxide to obtain GO-NH2;

[0007] S2) aminating the polyester fiber to obtain PET-NH2;

[0008] S3) modifying the polyester fiber with isocyanate to obtain PET-NCO;

[0009] S4) Preparation of component B: weigh 40-50 parts of polyol and remove water at high temperature of 120° C. for 2 hours, add 80-100 parts of polyisocyanate under N2 protection and stir and react at 80° C. for 0.5-1 hour to obtain an isocyanate-terminated polyurethane prepolymer, namely PU-NCO; then weigh 5-10 parts of PET-NCO, 10-20 parts of plasticizer, and 0.01-0.5 parts of antioxidant and add them to the above PU-NCO, continue stirring for 1 hour, and obtain a polyester fiber composite isocyanate-terminated polyurethane prepolymer, namely component B;

[0010] S5) Preparation of component C: weigh 0.3-0.5 parts of GO-NH2, 80-100 parts of polyol, 5-10 parts of active compatibilizer, 0.05-0.3 parts of catalyst, 0.05-0.5 parts of antioxidant, 0.1-0.3 parts of defoamer, stir at room temperature for 0.5-1h to obtain modified polyol, which is component C;

[0011] S6) Preparation of modified asphalt with bionic structure: weigh 10-30 parts of component B and 10-20 parts of component C and stir for 5-10 minutes, add them into 100-150 parts of road asphalt, stir at 160°C for 0.5h, and obtain high-performance asphalt with bionic structure.

[0012] In some specific embodiments, the amination of graphene oxide in step S1) is specifically as follows: weigh 5-10 parts of graphene oxide into a flask, add 200-300 parts of a non-polar solvent and 200-300 parts of aprotic polar solvent, then add 15-20 parts of silane coupling agent, ultrasonically oscillate for 30 minutes, reflux in a 100°C oil bath for 10 hours, and after completion, repeatedly wash with aprotic polar solvent and dry to obtain amination of graphene oxide, namely GO-NH2.

[0013] In some specific embodiments, the polyester fiber amination in step S2) is specifically as follows: first, weigh 20-40 parts of polyester fiber, put it into an ultrasonic cleaner, wash it with distilled water at 90°C for 1 hour to remove surface oil, put it into a 115°C oven for drying, put the washed polyester fiber into a beaker, add 100-200 parts of aprotic polar solvent to make it completely infiltrated, and then put the beaker into a 140°C oven to swell for 1 hour; secondly, weigh 3-5 parts of initiator and dissolve it in 100-150 parts of non-polar solvent; then, weigh 5-10 parts of cross-linking agent and dissolve it in 100-200 parts of distilled water, and put it into a flask equipped with a reflux device; finally, put the swollen polyester fiber and benzoyl peroxide dissolved in the non-polar solvent into the above flask, heat it to 80°C and pass N2 protection, stir and react for 3 hours, wash it with distilled water and methanol after the reaction, and dry it to obtain the amination polyester fiber, that is, PET-NH2.

[0014] In some specific embodiments, the isocyanate-modified polyester fiber in step S3) is specifically prepared by weighing 10-20 parts of PET-NH2 and 150-200 parts of aprotic polar solvent into a flask, adding 100-150 parts of polyisocyanate, and reacting under N2 protection at 80°C for 10 hours with continuous stirring, filtering, and washing with aprotic polar solvent to obtain isocyanate-modified polyester fiber, namely PET-NCO.

[0015] In some specific embodiments, the non-polar solvent is at least one of acetone, butanone, petroleum ether, n-hexane, toluene, benzene, etc.; the aprotic polar solvent is at least one of N,N-dimethylformamide, dimethyl sulfoxide, acetonitrile, etc.;

[0016] In some specific embodiments, the cross-linking agent is at least one of N-hydroxymethyl acryloyl, N-trimethylol methacrylamide, and N-acryloyl (trimethylol) aminomethane.

[0017] In some specific embodiments, the silane coupling agent is at least one of silane coupling agent KH-570, silane coupling agent KBM-503, silane coupling agent A151, etc.;

[0018] In certain specific embodiments, the polyisocyanate is at least one of isophorone diisocyanate (IPDI), toluene-2,4-diisocyanate (TDI), and 4,4'-diphenylmethane diisocyanate (MDI).

[0019] In some specific embodiments, the polyol is at least one of polyether polyol C2100, polyether polyol C280, and polyether polyol C204; the active phase solvent is at least one of aromatic oil, castor oil, and epoxidized soybean oil; the catalyst is at least one of triethylamine and triethylamine acetic acid;

[0020] In some specific embodiments, the road asphalt is modified asphalt with a softening point of ≥ 60°C.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] 1) The preparation method provided by the present invention, the nano graphene oxide used in the asphalt system has high strength and high toughness; by adopting the amino-functionalized graphene oxide raw material, the mechanical properties of the asphalt can be enhanced, and the functionalized graphene oxide reacts with the isocyanate-terminated polyurethane prepolymer and can be evenly dispersed in the matrix, giving the material better durability and UV resistance.

[0023] 2) In the present invention, by adding functionalized polyester fibers, the isocyanate-modified polyester fibers can not only react with the hydroxyl groups in the polyols, but also be evenly dispersed in the asphalt system, which can significantly increase the elasticity and flexibility of the material, so that it can maintain good deformation ability under high and low temperature conditions, and the polyester fiber-modified polyurethane asphalt has stronger tolerance to ultraviolet rays, oxidation and chemical corrosion, thereby extending its service life;

[0024] 3) The present invention can significantly improve the compatibility of polyurethane with base asphalt by introducing amino-modified graphene oxide and isocyanate-modified polyester fiber, change the distribution morphology of polyurethane in the base asphalt, make the distribution of polyurethane-modified asphalt more uniform, form a network structure of bionic structure, and give the material better high and low temperature performance.

[0025] 4) The preparation method of the present invention has easy-to-obtain raw materials, simple process steps, easy-to-control experimental parameters, good portability, and is suitable for wide application in road construction in my country. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below.

[0027] Figure 1 This is a polarization image of the modified asphalt provided by the present invention;

[0028] Figure 2 This is a polarization diagram of the graphene oxide and polyester fiber added without amination in the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0030] When a certain amount, concentration or other value or parameter is expressed in the form of a range, a preferred range, or a preferred upper and lower numerical limit, it should be understood that it is equivalent to specifically revealing any range by combining any pair of upper range limits or preferred numerical values ​​with any lower range limit or preferred numerical value, regardless of whether the range is specifically disclosed. Unless otherwise indicated, the numerical range values ​​listed herein include the endpoints of the range, and all integers and fractions within the range.

[0031] Unless otherwise indicated, all percentages, parts, ratios, etc. herein are by weight.

[0032] The materials, methods, and examples herein are illustrative and are not to be construed as limiting unless specifically stated.

[0033] In the present application, the road asphalt used is SBS modified asphalt (ID) type, and the softening point is not less than 60°C; the graphene oxide used has a diameter of 0.5-5μm and a purity of ≥97wt%; the polyester fiber has a length of 0.5-20μm; the non-polar solvent used is at least one of acetone, butanone, petroleum ether, n-hexane, toluene, and benzene; the non-protonic polar solvent used is at least one of N,N-dimethylformamide, dimethyl sulfoxide, and acetonitrile; the silane coupling agent used is at least one of silane coupling agent KH-570, silane coupling agent KBM-503, and silane coupling agent A151; the polyisocyanate used is at least one of isophorone diisocyanate (IPDI), toluene-2,4-diisocyanate (TDI), and 4,4'-diphenylmethane diisocyanate (MDI); the initiator used is benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), diethyl peroxide dicarbonate (DPC), and diisocyanate (DPC). The invention discloses a polyol comprising: a polyol having a polyol content of 1000 % and a polyol content of 1000 %; a polyol having a polyol content of 2000 % and a polyol content of 4000 %; a polyol having a polyol content of 1000 % and a polyol content of 5000 %; a polyol having a polyol content of 2000 % and a polyol content of 4000 %; a polyol having a polyol content of 2000 % and a polyol content of 5 ...

[0034] Furthermore, in the following embodiments, the road asphalt used is SBS modified asphalt (ID) type with a softening point of 70°C; the non-polar solvent used is acetone; the non-protonic polar solvent used is N,N-dimethylformamide; the silane coupling agent used is KH-570; the polyisocyanate used is 4,4'-diphenylmethane diisocyanate (MDI); the initiator used is benzoyl peroxide; the cross-linking agent used is N-trihydroxymethyl methacrylamide; the polyol used is polyether polyol C2100; the plasticizer used is dibutyl phthalate; the antioxidant used is antioxidant 170; the catalyst used is triethylamine; the active compatibilizer used is epoxidized soybean oil; the antioxidant used is N-phenyl-α-naphthylamine; and the defoaming agent used is silicone defoaming agent DF-2852.

[0035] The test methods used in the following embodiments include:

[0036] The high and low temperature stability of modified asphalt is reflected by testing the main properties of each test sample respectively; the main properties tested in this application include high temperature stability, low temperature crack resistance, compatibility, etc.

[0037] 1) Softening point test;

[0038] Use a softening point tester and the oil bath method should be used for softening point testing according to ASTM D;

[0039] 2) Ductility test

[0040] Use a ductility tester to conduct ductility test in a water bath at 5°C in accordance with GB / T 4508-2010;

[0041] 3) Dynamic shear rheology test

[0042] The dynamic shear modulus and phase angle of asphalt were measured using a dynamic shear rheometer in accordance with SH / T 0777-2005.

[0043] 4) Low temperature bending beam creep test

[0044] The low-temperature creep stiffness test of the samples was carried out using BBR bending beam rheometer equipment according to the TG E20-2011 method to evaluate the low-temperature crack resistance of asphalt, with a focus on reflecting the low-temperature resistance to temperature shrinkage cracking;

[0045] 5) Storage stability test

[0046] The storage stability of modified asphalt was evaluated according to the polymer modified asphalt segregation test method (SH / T0740-2003);

[0047] 6) Microscopic phase test

[0048] The microstructure of modified asphalt was tested using a hot stage polarizing microscope.

[0049] Example 1

[0050] This embodiment provides a method for preparing modified asphalt with a bionic structure, which comprises the following steps:

[0051] (1) Amination of graphene oxide: Weigh 5 parts of graphene oxide into a flask, add 200 parts of non-polar solvent and 200 parts of aprotic polar solvent, then add 15 parts of silane coupling agent, ultrasonically vibrate for 30 minutes, put it in a 100°C oil bath for reflux reaction for 10 hours, and then wash it repeatedly with aprotic polar solvent and dry it to obtain amination of graphene oxide, namely GO-NH2;

[0052] (2) Amination of polyester fiber: First, weigh 20 parts of polyester fiber and put it into an ultrasonic cleaner and wash it with distilled water at 90°C for 1 hour to remove surface oil stains, then put it into a 115°C oven for drying, put the washed polyester fiber into a beaker, add 100 parts of aprotic polar solvent to make it completely soaked, and then put the beaker into a 140°C oven for swelling for 1 hour; secondly, weigh 3 parts of initiator and dissolve it in 100 parts of non-polar solvent; then, weigh 5 parts of cross-linking agent and dissolve it in 100 parts of distilled water, and put it into a flask equipped with a reflux device; finally, put the swollen polyester fiber and benzoyl peroxide dissolved in the non-polar solvent into the above flask, heat it to 80°C and pass N2 protection, stir and react for 3 hours, wash it with distilled water and methanol after the reaction, and dry it to obtain the amination polyester fiber, namely PET-NH2;

[0053] (3) Isocyanate-modified polyester fiber: 10 parts of PET-NH2 and 150 parts of aprotic polar solvent were weighed and placed in a flask, and 100 parts of polyisocyanate were added. The mixture was reacted under nitrogen protection at 80°C for 10 hours with continuous stirring, filtered, and washed with aprotic polar solvent to obtain isocyanate-modified polyester fiber, namely PET-NCO.

[0054] (4) Preparation of component B: Weigh 40 parts of polyol and remove water at 120°C for 2 hours, add 80 parts of polyisocyanate under N2 protection and stir at 80°C for 1 hour to obtain an isocyanate-terminated polyurethane prepolymer, namely PU-NCO; then weigh 5 parts of PET-NCO, 10 parts of plasticizer, and 0.03 parts of antioxidant and add them to the above PU-NCO, continue stirring for 1 hour, and obtain a polyester fiber composite isocyanate-terminated polyurethane prepolymer, namely component B;

[0055] (5) Preparation of component C: Weigh 0.3 parts of GO-NH2, 80 parts of polyol, 5 parts of active compatibilizer, 0.15 parts of catalyst, 0.3 parts of antioxidant, and 0.2 parts of defoamer, and stir at room temperature for 0.5 h to obtain modified polyol, which is component C;

[0056] (6) Preparation of modified asphalt with bionic structure: Weigh 10 parts of component B and 10 parts of component C and stir for 10 minutes, add them into 100 parts of road asphalt, and stir at 160°C for 0.5 hours to obtain modified asphalt with bionic structure.

[0057] Example 2

[0058] This embodiment provides a method for preparing modified asphalt with a bionic structure, which comprises the following steps:

[0059] (1) Amination of graphene oxide: 8 parts of graphene oxide were weighed into a flask, 250 parts of non-polar solvent and 250 parts of aprotic polar solvent were added, and then 18 parts of silane coupling agent were added. Ultrasonic oscillation was performed for 30 minutes, and the mixture was placed in a 100°C oil bath for reflux reaction for 10 hours. After completion, the mixture was repeatedly washed with aprotic polar solvent and dried to obtain amination of graphene oxide, namely GO-NH2.

[0060] (2) Amination of polyester fiber: First, weigh 30 parts of polyester fiber and put it into an ultrasonic cleaner and wash it with distilled water at 90°C for 1 hour to remove surface oil stains, then put it into a 115°C oven for drying, put the washed polyester fiber into a beaker, add 150 parts of aprotic polar solvent to make it completely soaked, and then put the beaker into a 140°C oven for swelling for 1 hour; secondly, weigh 4 parts of initiator and dissolve it in 120 parts of non-polar solvent; then, weigh 8 parts of cross-linking agent and dissolve it in 150 parts of distilled water, and put it into a flask equipped with a reflux device; finally, put the swollen polyester fiber and benzoyl peroxide dissolved in the non-polar solvent into the above flask, heat it to 80°C and pass N2 protection, stir and react for 3 hours, wash it with distilled water and methanol after the reaction, and dry it to obtain the amination polyester fiber, namely PET-NH2;

[0061] (3) Isocyanate-modified polyester fiber: 15 parts of PET-NH2 and 160 parts of aprotic polar solvent were weighed and placed in a flask, and 120 parts of polyisocyanate were added. The mixture was stirred and reacted for 10 hours at 80°C under nitrogen protection. The mixture was filtered and washed with an aprotic polar solvent to obtain isocyanate-modified polyester fiber, namely PET-NCO.

[0062] (4) Preparation of component B: Weigh 45 parts of polyol and remove water at 120°C for 2 hours. Add 90 parts of polyisocyanate under N2 protection and stir for reaction at 80°C for 1 hour to obtain an isocyanate-terminated polyurethane prepolymer, namely PU-NCO. Then weigh 6 parts of PET-NCO, 15 parts of plasticizer, and 0.3 parts of antioxidant and add them to the above PU-NCO. Stir for 1 hour to obtain a polyester fiber composite isocyanate-terminated polyurethane prepolymer, namely component B.

[0063] (5) Preparation of component C: Weigh 0.4 parts of GO-NH2, 90 parts of polyol, 6 parts of active compatibilizer, 0.2 parts of catalyst, 0.3 parts of antioxidant, and 0.2 parts of defoamer, and stir at room temperature for 1 hour to obtain modified polyol, which is component C.

[0064] (6) Preparation of modified asphalt with bionic structure: Weigh 25 parts of component B and 16 parts of component C and stir for 10 minutes, add them into 100 parts of road asphalt, and stir at 160°C for 0.5 hours to obtain modified asphalt with bionic structure.

[0065] Example 3

[0066] This embodiment provides a method for preparing modified asphalt with a bionic structure, which comprises the following steps:

[0067] (1) Amination of graphene oxide: Weigh 10 parts of graphene oxide into a flask, add 300 parts of non-polar solvent and 300 parts of aprotic polar solvent, then add 18 parts of silane coupling agent, ultrasonically oscillate for 30 minutes, reflux in a 100°C oil bath for 10 hours, and then repeatedly wash with aprotic polar solvent and dry to obtain amination of graphene oxide, namely GO-NH2.

[0068] (2) Amination of polyester fiber: First, weigh 40 parts of polyester fiber and put it into an ultrasonic cleaner and wash it with distilled water at 90°C for 1 hour to remove surface oil stains, then put it into a 115°C oven for drying, put the washed polyester fiber into a beaker, add 200 parts of aprotic polar solvent to make it completely soaked, and then put the beaker into a 140°C oven to swell for 1 hour; secondly, weigh 5 parts of initiator and dissolve it in 150 parts of non-polar solvent; then, weigh 10 parts of cross-linking agent and dissolve it in 200 parts of distilled water, and put it into a flask equipped with a reflux device; finally, put the swollen polyester fiber and benzoyl peroxide dissolved in the non-polar solvent into the above flask, heat to 80°C and pass N2 protection, stir and react for 3 hours, after the reaction is completed, wash it with distilled water and methanol, and dry it to obtain the amination polyester fiber, namely PET-NH2.

[0069] (3) Isocyanate-modified polyester fiber: Weigh 20 parts of PET-NH2 and 160 parts of aprotic polar solvent into a flask, add 120 parts of polyisocyanate, and react under nitrogen protection at 80°C with continuous stirring for 10 hours. Filter and wash with aprotic polar solvent to obtain isocyanate-modified polyester fiber, namely PET-NCO.

[0070] (4) Preparation of component B: Weigh 50 parts of polyol and remove water at 120°C for 2 hours. Add 90 parts of polyisocyanate under N2 protection and stir at 80°C for 0.5-1 hour to obtain an isocyanate-terminated polyurethane prepolymer, namely PU-NCO. Then weigh 8 parts of PET-NCO, 16 parts of plasticizer, and 0.2 parts of antioxidant and add them to the above PU-NCO. Stir for 1 hour to obtain a polyester fiber composite isocyanate-terminated polyurethane prepolymer, namely component B.

[0071] (5) Preparation of component C: Weigh 0.5 parts of GO-NH2, 100 parts of polyol, 6 parts of active compatibilizer, 0.1 parts of catalyst, 0.4 parts of antioxidant, and 0.2 parts of defoamer, and stir at room temperature for 1 hour to obtain modified polyol, which is component C.

[0072] (6) Preparation of modified asphalt with bionic structure: Weigh 20 parts of component B and 10 parts of component C and stir for 10 minutes, add them into 120 parts of road asphalt, and stir at 160°C for 0.5 hours to obtain modified asphalt with bionic structure.

[0073] This application takes Example 2 as an example, and tests the performance of the prepared modified asphalt with a bionic structure according to the JTG E20-2011 standard. The results are shown in Table 1:

[0074] Table 1 Test results of modified asphalt with bionic structure

[0075] Test items Test Results Conventional modified asphalt materials Softening point(℃) 105 81 Elongation (5℃, cm) 51 30 Storage stability(℃) 0.4 1.7 Rutting factor G* / sinδ(94℃,kPa) 1.57 0.39 Creep rate (-18℃)m 0.58 0.41

[0076] As can be seen from Table 1, the modified asphalt prepared in the present application is superior to conventional modified asphalt materials in both high and low temperature performance; this indicates that the modified asphalt exhibits better stability and crack resistance under different temperature conditions, is suitable for more severe climatic environments, and has good application prospects.

[0077] Comparative Example 1

[0078] This comparative example provides a method for preparing modified asphalt with a bionic structure, and the preparation method is basically the same as that of Example 2, except that the graphene oxide is not subjected to an amination treatment.

[0079] Comparative Example 2

[0080] This comparative example provides a method for preparing modified asphalt with a bionic structure, and the preparation method is basically the same as that of Example 2, except that the polyester fiber is not subjected to amination.

[0081] Comparative Example 3

[0082] This comparative example provides a method for preparing modified asphalt with a bionic structure, and the preparation method is basically the same as that of Example 2, except that only the polyester fiber is aminated without isocyanate modification.

[0083] Comparative Example 4

[0084] This comparative example provides a method for preparing modified asphalt with a bionic structure, and the preparation method is basically the same as that of Example 2, except that amino-treated graphene oxide is not added.

[0085] Comparative Example 5

[0086] This comparative example provides a method for preparing modified asphalt with a bionic structure, and its preparation method is basically the same as that of Example 2, except that no isocyanate-modified polyester fiber is added.

[0087] Comparative Example 6

[0088] This comparative example provides a method for preparing modified asphalt with a bionic structure, and the preparation method is basically the same as that of Example 2, except that unaminated graphene oxide and unaminated polyester fibers are added.

[0089] The modified asphalt prepared in Comparative Examples 1-6 was tested for performance, and the results are shown in Table 2:

[0090] Table 2 Test results of modified asphalt in Example 2 and each comparative example

[0091]

[0092] From the data in Table 2, it can be seen that the addition of unmodified graphene oxide or polyester fiber will significantly reduce the high and low temperature performance and mechanical properties of asphalt; this is because the unmodified graphene oxide and polyester fiber agglomerate in the system over a large area and have poor dispersion, which affects the structure and performance of asphalt. At the same time, modified asphalt without the addition of amino-modified graphene or isocyanate-modified polyester fiber will also lead to a decrease in overall performance. The reason may be that the introduction of amino-modified graphene and isocyanate-modified polyester fiber can significantly improve the compatibility of polyurethane with the base asphalt, change the distribution morphology of polyurethane in the base asphalt, make the distribution of polyurethane modified asphalt more uniform, form a network structure of the structure, and give the material better high and low temperature performance and mechanical properties.

[0093] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for preparing modified asphalt with a bionic structure, characterized in that: The steps include: S1) aminate graphene oxide to obtain GO-NH2; S2) aminating the polyester fiber to obtain PET-NH2; S3) modifying the polyester fiber with isocyanate to obtain PET-NCO; S4) Preparation of component B: by weight, weigh 40-50 parts of polyol and remove water at 120°C for 2h, add 80-100 parts of polyisocyanate under N2 protection and stir and react at 80°C for 0.5-1h to obtain an isocyanate-terminated polyurethane prepolymer, i.e. PU-NCO; then weigh 5-10 parts of PET-NCO, 10-20 parts of plasticizer, and 0.01-0.5 parts of antioxidant and add them to the above PU-NCO, continue stirring for 1h, and obtain a polyester fiber composite isocyanate-terminated polyurethane prepolymer, i.e. component B; S5) Preparation of component C: weigh 0.3-0.5 parts of GO-NH2, 80-100 parts of polyol, 5-10 parts of active compatibilizer, 0.05-0.3 parts of catalyst, 0.05-0.5 parts of antioxidant, 0.1-0.3 parts of defoamer, and stir at room temperature for 0.5-1h to obtain modified polyol, which is component C; S6) Preparation of modified asphalt with bionic structure: 10-30 parts of component B and 10-20 parts of component C are weighed by weight and stirred for 5-10 minutes, and then added into 100-150 parts of road asphalt and stirred at 160° C. for 0.5 hours to obtain modified asphalt with bionic structure.

2. The method for preparing modified asphalt with a bionic structure according to claim 1, characterized in that: The amination of graphene oxide in step S1) is specifically as follows: by weight, 5-10 parts of graphene oxide are weighed into a flask, 200-300 parts of a non-polar solvent and 200-300 parts of aprotic polar solvent are added, and then 15-20 parts of a silane coupling agent are added, ultrasonically vibrated for 30 minutes, and refluxed in a 100°C oil bath for 10 hours. After completion, it is repeatedly washed with aprotic polar solvent and dried to obtain amination of graphene oxide, namely GO-NH2.

3. The method for preparing modified asphalt with a bionic structure according to claim 1, characterized in that: The polyester fiber amination in step S2) is specifically as follows: first, by weight, 20-40 parts of polyester fiber are weighed, put into an ultrasonic cleaner, and washed with distilled water at 90°C for 1 hour to remove surface oil stains, and then put into a 115°C oven for drying. The washed polyester fiber is put into a beaker, 100-200 parts of aprotic polar solvent are added to completely infiltrate it, and then the beaker is put into a 140°C oven for swelling for 1 hour; secondly, 3-5 parts of initiator are weighed and dissolved in 100-150 parts of non-polar solvent; then, 5-10 parts of cross-linking agent are weighed and dissolved in 100-200 parts of distilled water, and put into a flask equipped with a reflux device; finally, the swollen polyester fiber and benzoyl peroxide dissolved in the non-polar solvent are put into the above flask, heated to 80°C and passed through N2 protection, stirred for reaction for 3 hours, and after the reaction is completed, washed with distilled water and methanol, and dried to obtain the amination polyester fiber, namely PET-NH2.

4. The method for preparing modified asphalt with a bionic structure according to claim 1, characterized in that: The isocyanate-modified polyester fiber in step S3) is specifically as follows: 10-20 parts by weight of PET-NH2 and 150-200 parts of aprotic polar solvent are weighed in a flask, 100-150 parts of polyisocyanate are added, and the reaction is continuously stirred for 10 hours at 80°C under N2 protection, filtered, and washed with aprotic polar solvent to obtain isocyanate-modified polyester fiber, namely PET-NCO.

5. The method for preparing modified asphalt with a bionic structure according to any one of claims 2 to 4, characterized in that: The non-polar solvent is at least one of acetone, butanone, petroleum ether, n-hexane, toluene, benzene, etc.; the non-protonic polar solvent is at least one of N,N-dimethylformamide, dimethyl sulfoxide, acetonitrile, etc.

6. The method for preparing modified asphalt with a bionic structure according to claim 3, characterized in that: The crosslinking agent is at least one of N-hydroxymethyl acryloyl, N-trimethylol methacrylamide and N-acryloyl (trimethylol) aminomethane.

7. The method for preparing modified asphalt with a bionic structure according to claim 2, characterized in that: The silane coupling agent is at least one of silane coupling agent KH-570, silane coupling agent KBM-503, silane coupling agent A151 and the like.

8. The method for preparing modified asphalt with a bionic structure according to claim 1 or 4, characterized in that: The polyisocyanate is at least one of isophorone diisocyanate (IPDI), toluene-2,4-diisocyanate (TDI), and 4,4'-diphenylmethane diisocyanate (MDI).

9. The method for preparing modified asphalt with a bionic structure according to claim 1, characterized in that: The polyol is at least one of polyether polyol C2100, polyether polyol C280 and polyether polyol C204; the active phase solvent is at least one of aromatic oil, castor oil and epoxidized soybean oil; and the catalyst is at least one of triethylamine and triethylamine acetic acid.

10. The method for preparing modified asphalt with a bionic structure according to claim 1, characterized in that: The road asphalt is modified asphalt with a softening point of ≥60°C.

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