CN112194773B - Dynamic diselenide bond polyurethane elastomer material and preparation method and application thereof - Google Patents
Dynamic diselenide bond polyurethane elastomer material and preparation method and application thereof Download PDFInfo
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- CN112194773B CN112194773B CN202011089035.9A CN202011089035A CN112194773B CN 112194773 B CN112194773 B CN 112194773B CN 202011089035 A CN202011089035 A CN 202011089035A CN 112194773 B CN112194773 B CN 112194773B
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- 229920003225 polyurethane elastomer Polymers 0.000 title claims abstract description 133
- 239000000463 material Substances 0.000 title claims abstract description 131
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 43
- 238000002156 mixing Methods 0.000 claims abstract description 42
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010426 asphalt Substances 0.000 claims description 96
- 239000011159 matrix material Substances 0.000 claims description 57
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 38
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 38
- 229920001451 polypropylene glycol Polymers 0.000 claims description 38
- 230000001939 inductive effect Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 22
- OMOVVBIIQSXZSZ-UHFFFAOYSA-N [6-(4-acetyloxy-5,9a-dimethyl-2,7-dioxo-4,5a,6,9-tetrahydro-3h-pyrano[3,4-b]oxepin-5-yl)-5-formyloxy-3-(furan-3-yl)-3a-methyl-7-methylidene-1a,2,3,4,5,6-hexahydroindeno[1,7a-b]oxiren-4-yl] 2-hydroxy-3-methylpentanoate Chemical compound CC12C(OC(=O)C(O)C(C)CC)C(OC=O)C(C3(C)C(CC(=O)OC4(C)COC(=O)CC43)OC(C)=O)C(=C)C32OC3CC1C=1C=COC=1 OMOVVBIIQSXZSZ-UHFFFAOYSA-N 0.000 claims description 19
- 239000000126 substance Substances 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 16
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 16
- XIMIGUBYDJDCKI-UHFFFAOYSA-N diselenium Chemical compound [Se]=[Se] XIMIGUBYDJDCKI-UHFFFAOYSA-N 0.000 claims 1
- 230000035876 healing Effects 0.000 abstract description 58
- 238000012423 maintenance Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 description 43
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- 238000005286 illumination Methods 0.000 description 3
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- 125000005442 diisocyanate group Chemical group 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 239000004814 polyurethane Substances 0.000 description 1
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- 238000005067 remediation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Polyurethanes Or Polyureas (AREA)
Abstract
The invention provides a dynamic diselenide bond polyurethane elastomer material and a preparation method and application thereof, belonging to the technical field of pavement maintenance, wherein the preparation steps respectively comprise: preparing a diisocyanate-terminated prepolymer A, preparing a diisocyanate-terminated prepolymer B, mixing the diisocyanate-terminated prepolymer A and the diisocyanate-terminated prepolymer B, adding a dimethyl sulfoxide solution dissolved with selenoamine hydrochloride, stirring, and curing to prepare the dynamic diselenide-bonded polyurethane elastomer material. The dynamic diselenide bond polyurethane elastomer material prepared by the invention has better healing capacity, and the healing rate can be higher than 93%.
Description
Technical Field
The invention belongs to the technical field of pavement maintenance, relates to a preparation technology of a self-healing material for an asphalt pavement, and particularly relates to a dynamic diselenide bond polyurethane elastomer material as well as a preparation method and application thereof.
Background
In the service process of the asphalt concrete pavement, the strength and the rigidity of the pavement are gradually reduced under the influence of the load action of an automobile and the external environment, so that fatigue cracking and pavement damage are caused, and the macroscopic expression of fatigue cracking is that large-area cracks expand and converge to form cracks. The presence of cracks in turn accelerates the occurrence of other diseases, such as loosening, water damage, etc. Therefore, preventing the generation and development of pavement cracks or timely and effectively maintaining and repairing the cracks is one of the main methods for guaranteeing the service life of the pavement.
For the problem of fatigue cracking, the traditional coping method adopts materials such as fiber reinforcement and modified asphalt to enhance the strength of the asphalt pavement, but the measures can only inhibit or delay the occurrence of cracks. In addition, there are many common crack repairing methods, such as crack filling, joint filling, micro-surfacing, etc., when a macro crack occurs on a road surface, the crack is treated to reduce the negative effect of the crack on the road surface, but the traffic is usually required to be interrupted and even large-area construction is required, and these methods are remedial measures performed after the crack occurs, and the crack problem cannot be fundamentally solved.
Disclosure of Invention
Aiming at the problems that the existing pavement maintenance is carried out on-site remediation after cracks appear, the problem of pavement cracks cannot be solved fundamentally, and the condition of pavement traffic is influenced, the invention provides a dynamic diselenide bond polyurethane elastomer material, and a preparation method and application thereof. The specific technical scheme is as follows:
a preparation method of a dynamic diselenide bond polyurethane elastomer material comprises the following steps:
1) taking the mass ratio of 12-18: 3-5, mixing polypropylene glycol and isophorone diisocyanate, carrying out vacuum oil bath at 50-70 ℃, stirring, and removing water to prepare a substance A; taking the mass ratio of 18-22: 3-5, mixing polypropylene glycol and isophorone diisocyanate, carrying out vacuum oil bath at 50-70 ℃, stirring, and removing water to prepare a substance B;
2) continuously reacting the substance A prepared in the step 1) for 50-70 minutes at 58-62 ℃ under a vacuum condition, inducing the polypropylene glycol and isophorone diisocyanate to be linked to form a long chain, and preparing a diisocyanate-terminated prepolymer A;
3) continuously reacting the substance B prepared in the step 1) for 20-40 minutes at 63-67 ℃ under a vacuum condition, inducing the polypropylene glycol and isophorone diisocyanate to be linked to form a long chain, and preparing a diisocyanate-terminated prepolymer B;
4) mixing the diisocyanate-terminated prepolymer A prepared in the step 2) and the diisocyanate-terminated prepolymer B prepared in the step 3) according to a molar ratio of 1: 0.5-1.5, adding a dimethyl sulfoxide solution in which selenoamine hydrochloride is dissolved, stirring, and carrying out vacuum curing at 160-200 ℃ for 15-25 hours to obtain the dynamic diselenide-bonded polyurethane elastomer material.
Further limiting, the step 2) is specifically: adding dibutyltin dilaurate with the concentration of 40-60 ppm into 16-20 g of the substance A, continuously reacting for 50-70 minutes at the temperature of 58-62 ℃ under a vacuum condition, and inducing polypropylene glycol and isophorone diisocyanate to be linked to form a long chain to prepare the diisocyanate-terminated prepolymer A.
Further limiting, the step 3) is specifically: and adding dibutyltin dilaurate with the concentration of 40-60 ppm into 20-25 g of the substance B, continuously reacting for 20-40 minutes at 63-67 ℃ under a vacuum condition, and inducing polypropylene glycol and isophorone diisocyanate to be linked to form a long chain to prepare the diisocyanate-terminated prepolymer B.
The dynamic diselenide bond polyurethane elastomer material is prepared by the preparation method of the dynamic diselenide bond polyurethane elastomer material.
Further defined, the structural formula of the dynamic diselenide bond polyurethane elastomer material is as follows:
wherein n is 2000-6000.
The dynamic diselenide bond polyurethane elastomer material can improve the self-healing property of matrix asphalt.
The application method of the dynamic diselenide bond polyurethane elastomer material in the aspect of preparing modified asphalt comprises the following steps: the dynamic diselenide bond polyurethane elastomer material is crushed into small particles, added into liquefied matrix asphalt, heated to 130-140 ℃ in an oil bath, stirred, sheared and emulsified, so that the dynamic diselenide bond polyurethane elastomer material is uniformly dispersed in the matrix asphalt, and the self-healing modified asphalt is prepared.
Further limiting, the mass ratio of the matrix asphalt to the dynamic diselenide bond polyurethane elastomer material is 100: 3-9.
Further, the particle size of the dynamic diselenide bond polyurethane elastomer material is 0.0005-0.0015 cubic centimeter.
Compared with the prior art, the invention has the beneficial effects that:
1. the dynamic diselenide bond polyurethane elastomer material prepared by the invention has good healing capability, the most effective healing time is 12 hours, and the healing rate can be higher than 93%.
2. The dynamic diselenide bond polyurethane elastomer material prepared by the invention can be applied to the preparation of modified asphalt, can well improve the self-healing performance of matrix asphalt, has an obvious promotion effect on the ductility of the matrix asphalt, can realize self-healing under a certain condition when micro cracks are generated on an asphalt pavement, prevents the micro cracks from expanding to form larger cracks, prolongs the service life of the pavement, reduces the maintenance cost of the pavement and reduces the carbon emission in the maintenance process. The verification of the invention shows that when the mixing amount of the dynamic diselenide bond polyurethane elastomer material is 3%, the ductility of the matrix asphalt is lower, and the dynamic diselenide bond polyurethane elastomer material is suitable for the environment with higher temperature; when the mixing amount of the dynamic diselenide bond polyurethane elastomer material is 5%, the modified asphalt has the strongest healing capability; when the mixing amount of the dynamic diselenide bond polyurethane elastomer material is 7%, the modified asphalt has the highest healing index, namely the optimal mixing amount of the dynamic diselenide bond polyurethane elastomer material is 7%; when the mixing amount of the dynamic diselenide bond polyurethane elastomer material is 9 percent, the dynamic diselenide bond polyurethane elastomer material is suitable for repairing pavement cracks in a low-temperature environment. Different dynamic diselenide bond polyurethane elastomer material mixing amounts can be selected according to different pavement environments.
Drawings
FIG. 1 is a graph showing the change in maximum tensile strength and rate of healing of the dynamic diselenide-bonded polyurethane elastomer prepared in example 1 at 20 ℃ under natural light conditions for different healing times;
FIG. 2 is a graph showing the change in the healing rate of the dynamic diselenide-bonded polyurethane elastomer prepared in example 1 after 0.5h and 12h at 20 ℃ and 60 ℃ respectively;
FIG. 3 is a graph showing the change in the healing rate of the dynamic diselenide-bonded polyurethane elastomer prepared in example 1 after 0.5h and 12h healing at 20 ℃, natural light and no light;
FIG. 4 is a graph showing the changes in softening point, penetration and ductility of the dynamic diselenide-bonded polyurethane elastomer prepared in example 1 at different loadings;
FIG. 5 is a graph showing the change of the healing index of the modified asphalt prepared in example 6 at different healing times.
Detailed Description
The technical solutions of the present invention will be further explained below with reference to the drawings and examples, but the present invention is not limited to the embodiments described below.
The invention relates to a preparation method of a dynamic diselenide bond polyurethane elastomer material, which comprises the following steps:
1) taking the mass ratio of 12-18: 3-5, mixing polypropylene glycol and isophorone diisocyanate, carrying out vacuum oil bath at 50-70 ℃, stirring, and removing water to prepare a substance A; taking the mass ratio of 18-22: 3-5, mixing polypropylene glycol and isophorone diisocyanate, carrying out vacuum oil bath at 50-70 ℃, stirring, and removing water to prepare a substance B;
2) continuously reacting the substance A prepared in the step 1) for 50-70 minutes at 58-62 ℃ under a vacuum condition, inducing the polypropylene glycol and isophorone diisocyanate to be linked to form a long chain, and preparing a diisocyanate-terminated prepolymer A;
3) continuously reacting the substance B prepared in the step 1) for 20-40 minutes at 63-67 ℃ under a vacuum condition, inducing the polypropylene glycol and isophorone diisocyanate to be linked to form a long chain, and preparing a diisocyanate-terminated prepolymer B;
4) mixing the diisocyanate-terminated prepolymer A prepared in the step 2) and the diisocyanate-terminated prepolymer B prepared in the step 3) according to a molar ratio of 1: 0.5-1.5, adding a dimethyl sulfoxide solution in which selenoamine hydrochloride is dissolved, stirring, and carrying out vacuum curing at 160-200 ℃ for 15-25 hours to obtain the dynamic diselenide-bonded polyurethane elastomer material.
The chemical reaction process for preparing the dynamic diselenide bond polyurethane elastomer material by the diisocyanate end-capping prepolymer A and the diisocyanate end-capping prepolymer B is as follows:
wherein n is 2000-6000.
Preferably, step 3) is specifically: adding dibutyltin dilaurate with the concentration of 40-60 ppm into 16-20 g of the substance A, continuously reacting for 50-70 minutes at the temperature of 58-62 ℃ under a vacuum condition, and inducing polypropylene glycol and isophorone diisocyanate to be linked to form a long chain to prepare the diisocyanate-terminated prepolymer A.
Preferably, the step 4) is specifically: and adding dibutyltin dilaurate with the concentration of 40-60 ppm into 20-25 g of the substance B, continuously reacting for 20-40 minutes at 63-67 ℃ under a vacuum condition, and inducing polypropylene glycol and isophorone diisocyanate to be linked to form a long chain to prepare the diisocyanate-terminated prepolymer B.
The dynamic diselenide bond polyurethane elastomer material is prepared by the preparation method of the dynamic diselenide bond polyurethane elastomer material.
Further limited, the structural formula of the dynamic diselenide bond polyurethane elastomer material is as follows:
wherein n is 2000-6000.
The dynamic diselenide bond polyurethane elastomer material can improve the self-healing property of matrix asphalt.
The application method of the dynamic diselenide bond polyurethane elastomer material in the aspect of preparing modified asphalt comprises the following steps: the dynamic diselenide bond polyurethane elastomer material is crushed into small particles, added into liquefied matrix asphalt, heated to 130-140 ℃ in an oil bath, stirred, sheared and emulsified, so that the dynamic diselenide bond polyurethane elastomer material is uniformly dispersed in the matrix asphalt, and the self-healing modified asphalt is prepared. Wherein the mass ratio of the matrix asphalt to the dynamic diselenide bond polyurethane elastomer material is 100: 3-9. The particle size of the dynamic diselenide bond polyurethane elastomer material is 0.0005-0.0015 cubic centimeter.
Example 1
The embodiment of the invention relates to a preparation method of a dynamic diselenide bond polyurethane elastomer material, which comprises the following steps:
1) adding 15g of polypropylene glycol (Mn ═ 2000) into a three-neck glass flask, adding 3.34g of isophorone diisocyanate into the three-neck glass flask, placing the mixture into a 60 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 30 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance A;
2) adding 20g of polypropylene glycol (Mn-6000) into a three-neck glass flask, adding 3.56g of isophorone diisocyanate into the three-neck glass flask, placing the mixture into a 60 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 30 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance B;
3) adding dibutyltin dilaurate with the concentration of 50ppm serving as a catalyst into 18.34g of the substance A prepared in the step 1), continuously reacting for 60 minutes at 60 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain to obtain a diisocyanate-terminated prepolymer A with the molecular weight of 2444.56g/mol and a colorless viscous state, and storing the diisocyanate-terminated prepolymer A in a sealed glass bottle;
4) adding dibutyltin dilaurate with the concentration of 50ppm serving as a catalyst into 23.56g of the substance B prepared in the step 2), continuously reacting for 30 minutes at 65 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain to obtain a diisocyanate-terminated prepolymer B with the molecular weight of 6444.56g/mol and a colorless viscous state, and storing the diisocyanate-terminated prepolymer B in a sealed glass bottle;
5) mixing the diisocyanate-terminated prepolymer A prepared in the step 3) and the diisocyanate-terminated prepolymer B prepared in the step 4) according to a molar ratio of 1:1, pouring the mixture into a three-neck glass flask, adding 3ml of dimethyl sulfoxide solution in which 0.72g of selenoamine hydrochloride is dissolved, vacuumizing the flask by using a vacuum pump, stirring the mixture for 15 minutes by using an electromagnetic stirrer, assisting the dissolution by using ultrasonic waves, and curing the mixture for 20 hours at 180 ℃ to prepare the dynamic diselenide bond polyurethane elastomer material.
Example 2
The embodiment of the invention relates to a preparation method of a dynamic diselenide bond polyurethane elastomer material, which comprises the following steps:
1) adding polypropylene glycol (Mn ═ 2000) with the mass of 12g into a three-neck glass flask, adding isophorone diisocyanate with the mass of 3g into the three-neck glass flask, placing the three-neck glass flask into an oil bath kettle at 55 ℃ for preheating, vacuumizing the oil bath kettle by using a vacuum pump, stirring for 30 minutes at the stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance A;
2) adding 18g of polypropylene glycol (Mn-6000) into a three-neck glass flask, adding 3g of isophorone diisocyanate into the three-neck glass flask, placing the mixture into a 55 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 30 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance B;
3) adding dibutyltin dilaurate with the concentration of 40ppm serving as a catalyst into 16g of the substance A prepared in the step 1), continuously reacting for 55 minutes at 59 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain to obtain a colorless and viscous diisocyanate-terminated prepolymer A, and storing the diisocyanate-terminated prepolymer A in a sealed glass bottle;
4) adding dibutyltin dilaurate with the concentration of 40ppm serving as a catalyst into 20g of the substance B prepared in the step 2), continuously reacting for 25 minutes at 64 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain, obtaining a colorless and viscous diisocyanate-terminated prepolymer B, and storing the diisocyanate-terminated prepolymer B in a sealed glass bottle;
5) mixing the diisocyanate-terminated prepolymer A prepared in the step 3) and the diisocyanate-terminated prepolymer B prepared in the step 4) according to a molar ratio of 1:0.75, pouring the mixture into a three-neck glass flask, adding 3ml of dimethyl sulfoxide solution in which 0.72g of selenoamine hydrochloride is dissolved, vacuumizing the flask by using a vacuum pump, stirring the flask for 15 minutes by using an electromagnetic stirrer, assisting the solution by using ultrasonic waves, and curing the mixture for 22 hours at the temperature of 170 ℃ to prepare the dynamic diselenide bond polyurethane elastomer material.
Example 3
The embodiment of the invention relates to a preparation method of a dynamic diselenide bond polyurethane elastomer material, which comprises the following steps:
1) adding 13.5g of polypropylene glycol (Mn ═ 2000) into a three-neck glass flask, adding 3.5g of isophorone diisocyanate into the three-neck glass flask, placing the mixture in a 65 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 30 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance A;
2) adding 19g of polypropylene glycol (Mn-6000) into a three-neck glass flask, adding 3.5g of isophorone diisocyanate into the three-neck glass flask, placing the mixture into a 65 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 30 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance B;
3) adding 45ppm dibutyltin dilaurate serving as a catalyst into 17g of the substance A prepared in the step 1), continuously reacting for 65 minutes at 61 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain to obtain a colorless viscous diisocyanate-terminated prepolymer A, and storing the diisocyanate-terminated prepolymer A in a sealed glass bottle;
4) adding 45ppm dibutyltin dilaurate serving as a catalyst into 21.5g of the substance B prepared in the step 2), continuously reacting for 35 minutes at 66 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain to obtain a colorless viscous diisocyanate-terminated prepolymer B, and storing the diisocyanate-terminated prepolymer B in a sealed glass bottle;
5) mixing the diisocyanate-terminated prepolymer A prepared in the step 3) and the diisocyanate-terminated prepolymer B prepared in the step 4) according to a molar ratio of 1:1.25, pouring the mixture into a three-neck glass flask, adding 3ml of dimethyl sulfoxide solution in which 0.72g of selenoamine hydrochloride is dissolved, vacuumizing the flask by using a vacuum pump, stirring the mixture for 15 minutes by using an electromagnetic stirrer, assisting the dissolution by using ultrasonic waves, and curing the mixture for 18 hours at 190 ℃ to prepare the dynamic diselenide bond polyurethane elastomer material.
Example 4
The embodiment of the invention relates to a preparation method of a dynamic diselenide bond polyurethane elastomer material, which comprises the following steps:
1) adding 16.5g of polypropylene glycol (Mn ═ 2000) into a three-neck glass flask, adding 4g of isophorone diisocyanate into the three-neck glass flask, placing the mixture into a 50 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 30 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance A;
2) adding 21g of polypropylene glycol (Mn-6000) into a three-neck glass flask, adding 4g of isophorone diisocyanate into the three-neck glass flask, placing the mixture into a 50 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 30 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance B;
3) adding dibutyltin dilaurate with the concentration of 55ppm serving as a catalyst into 19g of the substance A prepared in the step 1), continuously reacting for 50 minutes at 58 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain to obtain a colorless and viscous diisocyanate-terminated prepolymer A, and storing the diisocyanate-terminated prepolymer A in a sealed glass bottle;
4) adding dibutyltin dilaurate with the concentration of 55ppm serving as a catalyst into 24g of the substance B prepared in the step 2), continuously reacting for 20 minutes at 63 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain, obtaining a colorless and viscous diisocyanate-terminated prepolymer B, and storing the diisocyanate-terminated prepolymer B in a sealed glass bottle;
5) mixing the diisocyanate-terminated prepolymer A prepared in the step 3) and the diisocyanate-terminated prepolymer B prepared in the step 4) according to a molar ratio of 1:0.5, pouring the mixture into a three-neck glass flask, adding 3ml of dimethyl sulfoxide solution in which 0.72g of selenoamine hydrochloride is dissolved, vacuumizing the flask by using a vacuum pump, stirring the mixture for 15 minutes by using an electromagnetic stirrer, assisting the dissolution by using ultrasonic waves, and curing the mixture for 25 hours at 160 ℃ to prepare the dynamic diselenide bond polyurethane elastomer material.
Example 5
The embodiment of the invention relates to a preparation method of a dynamic diselenide bond polyurethane elastomer material, which comprises the following steps:
1) adding 18g of polypropylene glycol (Mn ═ 2000) into a three-neck glass flask, adding 5g of isophorone diisocyanate into the three-neck glass flask, placing the mixture into a 70 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 25 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance A;
2) adding 22g of polypropylene glycol (Mn-6000) into a three-neck glass flask, adding 5g of isophorone diisocyanate into the three-neck glass flask, placing the mixture into a 70 ℃ oil bath pot for preheating, vacuumizing the oil bath pot by using a vacuum pump, stirring the mixture for 25 minutes at a stirring speed of 240r/min by using a cantilever type electric stirrer, and removing water to prepare a substance B;
3) adding 60ppm dibutyltin dilaurate serving as a catalyst into 20g of the substance A prepared in the step 1), continuously reacting for 70 minutes at 62 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain to obtain a colorless viscous diisocyanate-terminated prepolymer A, and storing the diisocyanate-terminated prepolymer A in a sealed glass bottle;
4) adding 60ppm dibutyltin dilaurate serving as a catalyst into 25g of the substance B prepared in the step 2), continuously reacting for 40 minutes at 67 ℃ under a vacuum condition, inducing polypropylene glycol to be linked with isophorone diisocyanate to form a long chain, obtaining a colorless viscous diisocyanate-terminated prepolymer B, and storing the diisocyanate-terminated prepolymer B in a sealed glass bottle;
5) mixing the diisocyanate-terminated prepolymer A prepared in the step 3) and the diisocyanate-terminated prepolymer B prepared in the step 4) according to a molar ratio of 1:1.5, pouring the mixture into a three-neck glass flask, adding 3ml of dimethyl sulfoxide solution in which 0.72g of selenoamine hydrochloride is dissolved, vacuumizing the flask by using a vacuum pump, stirring the mixture for 15 minutes by using an electromagnetic stirrer, assisting the dissolution by using ultrasonic waves, and curing the mixture for 15 hours at the temperature of 200 ℃ to prepare the dynamic diselenide bond polyurethane elastomer material.
Referring to fig. 1, it can be seen that the dynamic diselenide-bonded polyurethane elastomer material also shows a more pronounced healing behavior in a shorter healing time. When the healing time is 0.5h, the healing rate is 53%, and at the moment, the electrostatic attraction of the hydrogen bond and the fracture-recombination transformation of the diselenide bond in the dynamic diselenide bond polyurethane elastomer material enable the material to respond to the crack as soon as possible, so that the healing behavior is generated, and the healing effect is achieved. With the increase of the healing time, the broken diselenide bonds in the dynamic diselenide bond polyurethane elastomer material are continuously randomly recombined, so that the further healing behavior of the material is realized. It is noted that the dynamic diselenide bond polyurethane elastomer material has healing rates after 12h healing and 24h healing which are respectively 88% and 93%. This indicates that when the healing time exceeds 12 hours, the effect of the healing time on the healing ability of the dynamic diselenide bond polyurethane elastomer material is greatly reduced and the growth rate of the healing rate becomes slow. The reason for this may be that the recombination reaction of the broken diselenide bonds in the dynamic diselenide bond polyurethane elastomer material is substantially completed, and the influence of the continued increase of the healing time on the healing rate of polyurethane becomes smaller and smaller, so that it can be preliminarily determined that the most efficient healing time of the dynamic diselenide bond polyurethane elastomer material is 12 hours.
Referring to fig. 2, it can be seen that when the healing time is 0.5h, the dynamic diselenide bond polyurethane elastomer material has a healing rate of 63% at 60 ℃, which is increased by 11% compared with the healing rate at room temperature (20 ℃); when the healing time is 12 hours, the dynamic diselenide bond polyurethane elastomer material has a healing rate of 93% at 60 ℃, and the healing efficiency is increased by 5% compared with that at room temperature (20 ℃). Meanwhile, the temperature has a relatively obvious promotion effect on the healing rate, particularly on short-term healing. This indicates that elevated temperatures can provide energy to the self-healing system, accelerate intermolecular interactions and the reformation and transformation of diselenide bonds, thereby promoting self-healing and increasing healing efficiency.
Referring to fig. 3, it can be seen that when the healing time is 0.5h, the dynamic diselenide bond polyurethane elastomer material has a healing rate of 53% under natural light conditions and a healing rate of 52% under non-illumination conditions; when the healing time is 12, the dynamic diselenide bond polyurethane elastomer material has a healing rate of 88% under natural light conditions and a healing rate of 86% under non-illumination conditions. Visible light has a certain promoting effect on healing capacity, but the effect is small and negligible. The reason for this may be that natural light provides energy for the recombination of diselenide bonds, which promotes this process, but because the bond energy required for the recombination of diselenide bonds itself is small and the energy carried by natural light itself is limited, the effect of light on the healing behaviour is small. Meanwhile, the result also shows that the dynamic diselenide bond polyurethane elastomer material has stronger healing capability under the condition of no illumination.
Referring to fig. 4, it can be seen that the incorporation of the dynamic diselenide-bonded polyurethane elastomer material has little effect on the basic performance criteria of the asphalt. The penetration degree is increased slightly along with the increase of the mixing amount of the polyurethane elastomer, and the penetration degree reflects the viscosity of the asphalt, so that the penetration degree is higher, which indicates that the asphalt is higher in grade, namely lower in viscosity, and is more suitable for the environment with lower temperature; the blending of the dynamic diselenide bond polyurethane elastomer has almost no influence on the softening point, the softening point is the representation of the temperature sensitivity of the asphalt, and the probable reason that the change is not large is that the physical form of the dynamic diselenide bond polyurethane elastomer material is similar to that of the asphalt, and the curing temperature of the dynamic diselenide bond polyurethane elastomer material is also close to the mixing temperature of the asphalt mixture, so the high-temperature performance of the dynamic diselenide bond polyurethane elastomer material is similar to that of the matrix asphalt, and the influence on the softening point is not large; the dynamic diselenide bond polyurethane elastomer material has an effect of improving the ductility of asphalt. The ductility of the modified asphalt made of the dynamic diselenide bond polyurethane elastomer material is increased by increasing the doping amount, namely the doping of the polyurethane elastomer has positive influence on the low-temperature tensile property of the asphalt; the reason for this may be that the polyurethane elastomer itself has better stretchability and low temperature properties and therefore has a corresponding accelerating effect on the matrix asphalt.
The dynamic diselenide bond polyurethane elastomer materials prepared in examples 1 to 5 can be applied to the preparation of modified asphalt, which can improve the self-healing performance of matrix asphalt.
Example 6
The application method of the dynamic diselenide bond polyurethane elastomer material prepared in the embodiment 1 in the aspect of preparing the modified self-healing asphalt comprises the following steps:
1) putting the matrix asphalt in an oven, baking at 140 ℃ until the matrix asphalt becomes liquid, putting 200 g of the matrix asphalt in a stainless steel container, and putting the stainless steel container in the oven for heat preservation;
2) shearing the dynamic diselenide bond polyurethane elastomer material into small particles with the particle size of 0.001 cubic centimeter, adding 3 grams of the dynamic diselenide bond polyurethane elastomer material into the liquefied matrix asphalt prepared in the step 1), placing the mixture into an oil bath pan, setting the oil bath temperature to be 130 ℃, and stirring the mixture for 30 minutes at the stirring speed of 1200r/min to uniformly mix the dynamic diselenide bond polyurethane elastomer material and the liquefied matrix asphalt;
3) shearing for 15min at the temperature of 130 ℃ at 3500r/min by using a high-speed shearing emulsifying machine, further crushing and shearing the dynamic diselenide bond polyurethane elastomer material, and further fully mixing the dynamic diselenide bond polyurethane elastomer material and liquefied matrix asphalt to prepare the self-healing modified asphalt.
In the process of modifying the matrix asphalt, the dynamic diselenide bond polyurethane elastomer material is well mixed with the matrix asphalt, and the matrix asphalt and the dynamic diselenide bond polyurethane elastomer material do not generate obvious chemical reaction and only carry out physical mixing. The dynamic diselenide bond polyurethane elastomer material is uniformly dispersed in the matrix asphalt and keeps a good mixing state with the matrix asphalt. The dynamic diselenide bond polyurethane elastomer material has less doping amount in the asphalt, and the obtained matrix asphalt has lower ductility and is suitable for the environment with higher temperature.
Example 7
1) Putting the matrix asphalt in an oven, baking at 140 ℃ until the matrix asphalt becomes liquid, putting 200 g of the matrix asphalt in a stainless steel container, and putting the stainless steel container in the oven for heat preservation;
2) shearing the dynamic diselenide bond polyurethane elastomer material into small particles with the particle size of 0.0005 cubic centimeter, adding 5 grams of the small particles into the liquefied matrix asphalt prepared in the step 1), placing the mixture into an oil bath pan, setting the oil bath temperature to be 134 ℃, and stirring at the stirring speed of 1200r/min for 30 minutes to uniformly mix the dynamic diselenide bond polyurethane elastomer material and the liquefied matrix asphalt;
3) shearing for 15min at the temperature of 134 ℃ at 3500r/min by using a high-speed shearing emulsifying machine, further crushing and shearing the dynamic diselenide bond polyurethane elastomer material, and further fully mixing the dynamic diselenide bond polyurethane elastomer material and liquefied matrix asphalt to prepare the self-healing modified asphalt.
In the process of modifying the matrix asphalt, the dynamic diselenide bond polyurethane elastomer material is well mixed with the matrix asphalt, and the matrix asphalt and the dynamic diselenide bond polyurethane elastomer material do not generate obvious chemical reaction and only carry out physical mixing. The penetration and the ductility are increased slightly when being compared with the content of 3 percent, and the low-temperature stretchability is enhanced. When the content of the dynamic diselenide bond polyurethane elastomer material is 5%, the modified asphalt shows the strongest healing capability in a low-temperature tensile test. And the dynamic diselenide bond polyurethane elastomer material mixing amount is continuously increased, and the healing index begins to be reduced, so that the optimal mixing amount of the dynamic diselenide bond polyurethane elastomer material is determined to be 5%.
Example 8
1) Putting the matrix asphalt in an oven, baking at 140 ℃ until the matrix asphalt becomes liquid, putting 200 g of the matrix asphalt in a stainless steel container, and putting the stainless steel container in the oven for heat preservation;
2) shearing the dynamic diselenide bond polyurethane elastomer material into small particles with the particle size of 0.0015 cubic centimeter, adding 7 grams of the small particles into the liquefied matrix asphalt prepared in the step 1), placing the mixture into an oil bath pan, setting the oil bath temperature to be 136 ℃, and stirring the mixture for 30 minutes at the stirring speed of 1200r/min to uniformly mix the dynamic diselenide bond polyurethane elastomer material and the liquefied matrix asphalt;
3) shearing for 15min at 136 ℃ at 3500r/min by using a high-speed shearing emulsifying machine, further crushing and shearing the dynamic diselenide bond polyurethane elastomer material, and further fully mixing the dynamic diselenide bond polyurethane elastomer material and liquefied matrix asphalt to prepare the self-healing modified asphalt.
In the process of modifying the matrix asphalt, the dynamic diselenide bond polyurethane elastomer material is well mixed with the matrix asphalt, and the matrix asphalt and the dynamic diselenide bond polyurethane elastomer material do not generate obvious chemical reaction and only carry out physical mixing. The penetration degree and the ductility are slightly increased compared with the content of 5 percent, and the low-temperature stretchability is enhanced. The healing time has a significant effect on the healing behaviour of the bitumen. In addition, when the mixing amount of the dynamic diselenide bond polyurethane elastomer material is 7%, the modified asphalt has the highest healing index, and the healing index of the asphalt is reduced quickly by continuously increasing the mixing amount of the dynamic diselenide bond polyurethane elastomer. Therefore, the optimum amount of the dynamic diselenide bond polyurethane elastomer material is determined to be 7%.
Example 9
1) Putting the matrix asphalt in an oven, baking at 140 ℃ until the matrix asphalt becomes liquid, putting 200 g of the matrix asphalt in a stainless steel container, and putting the stainless steel container in the oven for heat preservation;
2) shearing the dynamic diselenide bond polyurethane elastomer material into small particles with the particle size of 0.0012 cubic centimeters, adding 7 grams of the small particles into the liquefied matrix asphalt prepared in the step 1), placing the mixture into an oil bath pan, setting the oil bath temperature to be 140 ℃, and stirring at the stirring speed of 1200r/min for 30 minutes to uniformly mix the dynamic diselenide bond polyurethane elastomer material with the liquefied matrix asphalt;
3) shearing for 15min at 140 ℃ at 3500r/min by using a high-speed shearing emulsifying machine, further crushing and shearing the dynamic diselenide bond polyurethane elastomer material, and further fully mixing the dynamic diselenide bond polyurethane elastomer material and liquefied matrix asphalt to prepare the self-healing modified asphalt.
In the process of modifying the matrix asphalt, the dynamic diselenide bond polyurethane elastomer material is well mixed with the matrix asphalt, and the matrix asphalt and the dynamic diselenide bond polyurethane elastomer material do not generate obvious chemical reaction and only carry out physical mixing. The penetration and the ductility are increased slightly when being compared with the content of 7 percent, and the low-temperature stretchability is enhanced. The method is suitable for repairing pavement cracks in a low-temperature environment, and therefore, the optimal mixing amount of the dynamic diselenide bond polyurethane elastomer material is determined to be 9%.
Referring to fig. 5, it can be seen that when the content of the dynamic diselenide bond polyurethane elastomer material is 3%, the ductility of the matrix asphalt is low, and the dynamic diselenide bond polyurethane elastomer material is suitable for the environment with high temperature; when the mixing amount of the dynamic diselenide bond polyurethane elastomer material is 5%, the modified asphalt has the strongest healing capability; when the mixing amount of the dynamic diselenide bond polyurethane elastomer material is 7%, the modified asphalt has the highest healing index, namely the optimal mixing amount of the dynamic diselenide bond polyurethane elastomer material is 7%; when the mixing amount of the dynamic diselenide bond polyurethane elastomer material is 9 percent, the dynamic diselenide bond polyurethane elastomer material is suitable for repairing pavement cracks in a low-temperature environment.
Claims (7)
1. A preparation method of a dynamic diselenide bond polyurethane elastomer material is characterized by comprising the following steps:
1) taking the mass ratio of 12-18: 3-5, mixing polypropylene glycol and isophorone diisocyanate, carrying out vacuum oil bath at 50-70 ℃, stirring, and removing water to prepare a substance A; taking the mass ratio of 18-22: 3-5, mixing polypropylene glycol and isophorone diisocyanate, carrying out vacuum oil bath at 50-70 ℃, stirring, and removing water to prepare a substance B;
2) continuously reacting the substance A prepared in the step 1) for 50-70 minutes at 58-62 ℃ under a vacuum condition, inducing the polypropylene glycol and isophorone diisocyanate to be linked to form a long chain, and preparing a diisocyanate-terminated prepolymer A;
3) continuously reacting the substance B prepared in the step 1) for 20-40 minutes at 63-67 ℃ under a vacuum condition, inducing the polypropylene glycol and isophorone diisocyanate to be linked to form a long chain, and preparing a diisocyanate-terminated prepolymer B;
4) mixing the diisocyanate-terminated prepolymer A prepared in the step 2) and the diisocyanate-terminated prepolymer B prepared in the step 3) according to a molar ratio of 1: 0.5-1.5, adding a dimethyl sulfoxide solution in which selenoamine hydrochloride is dissolved, stirring, and carrying out vacuum curing at 160-200 ℃ for 15-25 hours to obtain a dynamic diselenide-bonded polyurethane elastomer material;
the structural formula of the dynamic diselenide bond polyurethane elastomer material is as follows:
the structural formula of the dynamic diselenide bond polyurethane elastomer material is that n is 2000-6000.
2. The method for preparing the dynamic diselenide bond polyurethane elastomer material according to claim 1, wherein the step 2) is specifically: adding dibutyltin dilaurate with the concentration of 40-60 ppm into 16-20 g of the substance A, continuously reacting for 50-70 minutes at the temperature of 58-62 ℃ under a vacuum condition, and inducing polypropylene glycol and isophorone diisocyanate to be linked to form a long chain to prepare the diisocyanate-terminated prepolymer A.
3. The method for preparing the dynamic diselenide bond polyurethane elastomer material according to claim 1, wherein the step 3) is specifically: and adding dibutyltin dilaurate with the concentration of 40-60 ppm into 20-25 g of the substance B, continuously reacting for 20-40 minutes at 63-67 ℃ under a vacuum condition, and inducing polypropylene glycol and isophorone diisocyanate to be linked to form a long chain to prepare the diisocyanate-terminated prepolymer B.
4. The use of the material prepared by the method of claim 1 for preparing a modified asphalt, wherein the dynamic diselenide linkage polyurethane elastomer material improves the self-healing properties of the base asphalt.
5. The method for preparing the dynamic diselenide bond polyurethane elastomer material according to claim 4, wherein the method comprises the following steps: the dynamic diselenide bond polyurethane elastomer material is crushed into small particles, added into liquefied matrix asphalt, heated to 130-140 ℃ in an oil bath, stirred, sheared and emulsified, so that the dynamic diselenide bond polyurethane elastomer material is uniformly dispersed in the matrix asphalt, and the self-healing modified asphalt is prepared.
6. The application method of the material prepared by the preparation method of the dynamic diselenide-bonded polyurethane elastomer material in the aspect of preparing the modified asphalt is characterized in that the mass ratio of the matrix asphalt to the dynamic diselenide-bonded polyurethane elastomer material is 100: 3-9.
7. The application method of the material prepared by the preparation method of the dynamic diselenide-bonded polyurethane elastomer material in the aspect of preparing the modified asphalt is characterized in that the particle size of the dynamic diselenide-bonded polyurethane elastomer material is 0.0005-0.0015 cubic centimeter.
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