CN115073044B - Thermosetting polyurethane asphalt material based on microcapsule slow release technology and preparation method thereof - Google Patents
Thermosetting polyurethane asphalt material based on microcapsule slow release technology and preparation method thereof Download PDFInfo
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- CN115073044B CN115073044B CN202210566477.0A CN202210566477A CN115073044B CN 115073044 B CN115073044 B CN 115073044B CN 202210566477 A CN202210566477 A CN 202210566477A CN 115073044 B CN115073044 B CN 115073044B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/06—Making microcapsules or microballoons by phase separation
- B01J13/14—Polymerisation; cross-linking
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
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- Polyurethanes Or Polyureas (AREA)
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Abstract
The application provides a thermosetting polyurethane asphalt material based on a microcapsule slow release technology and a preparation method thereof, wherein the thermosetting polyurethane asphalt material based on the microcapsule slow release technology comprises the following raw materials in parts by mass: 0.3-1.2 parts of curing agent microcapsule, 0.6-1.1 parts of polyurethane prepolymer, 0.9-1.2 parts of asphalt, 0.1-0.7 part of compatilizer and 30-60 parts of mineral aggregate. The amine curing agent is prepared into microcapsules, so that the microcapsules are dispersed in the polyurethane asphalt, the curing agent is released by the microcapsules under the action of load in the construction rolling process, and the curing agent and the polyurethane asphalt undergo a curing reaction, so that the performance of the polyurethane asphalt material is enhanced. The material is simple in construction, the curing time of the polyurethane asphalt material is not required to be strictly controlled, and the polyurethane asphalt material is prevented from being solidified and hardened in advance. The application realizes the transformation from thermoplastic to thermosetting of the polyurethane asphalt material, and improves the mechanical property and road performance of the polyurethane asphalt material.
Description
Technical Field
The application belongs to the field of asphalt pavement materials, and relates to a preparation method and application of a polyurethane asphalt material based on microcapsule slow release technology for realizing thermosetting property of the material, and a preparation and application method of the polyurethane asphalt microcapsule material.
Background
With the development of transportation in recent years, the traffic volume and the axle load of automobiles are rapidly increased and the running is channelized, and higher requirements are put on the performances of asphalt and asphalt mixtures. The asphalt mixture is required to have high-temperature stability and low-temperature crack resistance, water stability, ageing resistance and fatigue resistance, and the service life of the pavement is prolonged.
Compared with common asphalt or other thermoplastic asphalt, the thermosetting polyurethane asphalt changes the thermoplastic property of the common asphalt, has excellent mechanical property, and mainly has high strength and rigidity, excellent fatigue property, good adhesive property and durability. The polyurethane can improve the acid resistance and alkali resistance of asphalt and the corrosion of an organic solvent to asphalt, improve the adhesion performance of asphalt to stones, and improve the water damage resistance of the mixture in the mixture. However, the thermosetting polyurethane asphalt material has very strict requirements on the construction process because of the relatively high crosslinking speed of the thermosetting polyurethane asphalt. If the conventional mixing means are adopted, a series of procedures such as transportation, paving and compaction must be completed in a short time, otherwise, consolidation and hardening of the materials occur, so that the whole process cannot be continued.
There have been some studies on polyurethane modified asphalt, for example, patent CN103772958B proposes an aqueous polyurethane asphalt material, and patent CN102617070B proposes a thermoplastic polyurethane asphalt concrete, which cannot exert the thermosetting advantage of polyurethane modified asphalt materials. Patent CN108276789B proposes self-healing thermosetting polyurethane asphalt, but the reaction rate is not well controlled.
Disclosure of Invention
In order to overcome the defects in the prior art, the application provides a thermosetting polyurethane asphalt material based on a microcapsule slow release technology and a preparation method thereof. The microcapsule containing the amine curing agent is prepared, the curing agent is released by the microcapsule under the action of load in the construction rolling process, and the curing agent and the polyurethane asphalt are subjected to curing reaction, so that the conventional mixing means are avoided, the polyurethane asphalt material is solidified and hardened in advance, the conversion from thermoplastic property to thermosetting property of the polyurethane asphalt material is realized, and the mechanical property and road performance of the polyurethane asphalt material are improved.
The application aims to provide a preparation method and application of a thermosetting polyurethane asphalt material based on a microcapsule slow-release technology, which realize the transformation of the polyurethane asphalt material from thermoplastic to thermosetting. The application further aims to provide a preparation and use method of the polyurethane asphalt microcapsule material, wherein microcapsule slow release technology is applied to the polyurethane asphalt material so as to avoid the early consolidation hardening of the material in the construction process.
In order to achieve the above purpose, the following technical scheme is adopted: a curing agent microcapsule, wherein: the curing agent microcapsule comprises a core material and a wall material, wherein the core material comprises one or more of ethylenediamine and 2-methylimidazole, and the wall material comprises one or more of phenolic resin, urea-formaldehyde resin unsaturated polyester resin and polymethyl methacrylate resin.
Preferably, the preparation method of the curing agent microcapsule comprises the following steps of preparing a wall material into a prepolymer, preparing a core material into emulsion, mixing the emulsion with the prepolymer at the temperature of 60-80 ℃, stirring at the speed of 300r/min for 16-20 h, reacting the prepolymer to generate an insoluble reticular cross-linked network, and coating the core material to form the microcapsule.
The application provides a thermosetting polyurethane asphalt material based on microcapsule slow release technology, wherein: the thermosetting polyurethane asphalt material comprises the following raw materials in parts by mass:
0.3 to 1.2 portions of curing agent microcapsule;
0.6 to 1.1 parts of polyurethane prepolymer;
0.9 to 1.2 portions of asphalt;
0.1 to 0.7 part of compatilizer;
30-60 parts of mineral aggregate;
the preparation method of the thermosetting polyurethane asphalt material comprises the following steps: after the preparation of the curing agent microcapsule and the polyurethane prepolymer is completed, the preparation of the thermosetting polyurethane asphalt material is carried out based on a microcapsule slow release technology; mixing polyurethane prepolymer, asphalt and compatilizer at 80-160 ℃ to obtain polyurethane asphalt cement, and carrying out two-stage mixing on polyurethane asphalt and mineral aggregate; the first stage is to stir at 80-160 ℃ for 30-60 min, and the second stage is to add curing agent microcapsule at 80-160 ℃ and stir for 10-15 min; and releasing a curing agent from the microcapsule during construction rolling, and performing curing reaction on the curing agent and polyurethane asphalt to finally obtain the thermosetting polyurethane asphalt material.
Preferably, the polyurethane prepolymer is prepared by reacting polyether polyol, isocyanate diphenylmethane diisocyanate and chain extender 1, 4-butanediol.
Preferably, the preparation method of the polyurethane prepolymer comprises the steps of adding a polyether polyol compound into a reaction kettle, vacuumizing and dehydrating for 2-4 hours at the temperature of 100-120 ℃, cooling to 60-70 ℃, and then adding the isocyanate diphenylmethane diisocyanate and the chain extender 1, 4-butanediol, wherein the proportion of the polyether polyol to the isocyanate to the chain extender is 1:2: and 0.5, under the protection of nitrogen, reacting for 4 hours at 60-90 ℃ and cooling to about 60 ℃ to obtain the polyurethane prepolymer.
Preferably, the asphalt is 70# or 90# matrix asphalt;
preferably, the compatibilizer is maleic anhydride.
Preferably, the mineral aggregate has grading characteristics, and the grading type can be any one of AC-13, SMA-13 or OGFC-13.
Preferably, the thermosetting polyurethane asphalt material can be applied to paving cement concrete bridge decks and steel bridge decks, paving and repairing airport pavement and asphalt pavement, and special road sections of intersections and stop stations.
The beneficial effects of the application are as follows:
the thermosetting polyurethane asphalt material based on the microcapsule slow release technology comprises the following raw materials in parts by mass: 0.3 to 1.2 parts of curing agent microcapsule, 0.6 to 1.1 parts of polyurethane prepolymer, 0.9 to 1.2 parts of asphalt, 0.1 to 0.7 part of compatilizer and 30 to 60 parts of mineral aggregate. The curing agent microcapsule is an amine curing agent microcapsule for promoting the polyurethane asphalt crosslinking reaction. Mixing polyurethane prepolymer, asphalt and compatilizer to prepare polyurethane asphalt, mixing the polyurethane asphalt with mineral aggregate, adding curing agent microcapsule, releasing the curing agent from the microcapsule in the construction rolling process, and performing curing reaction to finally obtain the thermosetting polyurethane asphalt material. The application discloses a thermosetting polyurethane asphalt material and a use method of a polyurethane asphalt microcapsule material. The change from thermoplastic property to thermosetting property of the polyurethane asphalt material is realized, and the performance of the polyurethane asphalt material is improved.
The amine curing agent is prepared into microcapsules, so that the microcapsules are dispersed in the polyurethane asphalt, the curing agent is released by the microcapsules under the action of load in the construction rolling process, and the curing agent and the polyurethane asphalt undergo a curing reaction, so that the performance of the polyurethane asphalt material is enhanced. The material is simple in construction, the curing time of the polyurethane asphalt material is not required to be strictly controlled, and the polyurethane asphalt material is prevented from being solidified and hardened in advance. The application realizes the transformation from thermoplastic to thermosetting of the polyurethane asphalt material, and improves the mechanical property and road performance of the polyurethane asphalt material.
Drawings
FIG. 1 is a topography of a scanning electron microscope of the microcapsules of example 1;
Detailed Description
For a better description of the objects, technical solutions and advantages of the present application, the present application will be further described with reference to the following specific examples.
Example 1:
the thermosetting polyurethane asphalt material based on the microcapsule slow release technology comprises the following raw materials in parts by mass: 1.1 parts of polyurethane prepolymer, 1.2 parts of asphalt, 0.6 part of compatilizer, 1.0 part of curing agent microcapsule and 51.2 parts of mineral aggregate. The compatilizer is maleic anhydride, the curing agent is a mixture of ethylenediamine and 2-methylimidazole, and the ratio of the two is 2.5:1. the thermosetting polyurethane asphalt material in this example adopts mineral aggregate grading AC-13.
Adding a polyether polyol compound into a reaction kettle, vacuumizing and dehydrating for 2-4 hours at the temperature of 100-120 ℃, cooling to 60-70 ℃, and adding the isocyanate diphenylmethane diisocyanate and the chain extender 1, 4-butanediol, wherein the proportion of the polyether polyol to the isocyanate to the chain extender is 1:2: and 0.5, under the protection of nitrogen, reacting for 4 hours at 60-90 ℃ and cooling to about 60 ℃ to obtain the polyurethane prepolymer.
The method for preparing the microcapsule by the in-situ polymerization method comprises the following steps: controlling the temperature between 20 and 80 ℃, and mixing urea-formaldehyde resin and phenolic resin to prepare a prepolymer wall material solution, wherein the ratio of the urea-formaldehyde resin to the phenolic resin is 1:1.6; then mixing the core material with an emulsifying agent to prepare emulsion, wherein the emulsifying agent is polyglycerol isostearate, glycerol and mineral oil in a ratio of 1:1.2: mixing at a ratio of 0.8; mixing the emulsion with the prepolymer wall material at 60-80 ℃, stirring at the speed of 300r/min for 16-20 h, generating an insoluble reticular cross-linked network by the prepolymer wall material in the reaction process, and coating the core material to form the microcapsule.
After the microcapsule preparation is completed, the preparation of the thermosetting polyurethane asphalt material is carried out based on a microcapsule slow release technology; mixing polyurethane prepolymer, asphalt and compatilizer at 80-160 ℃ to obtain polyurethane asphalt cement, and carrying out two-stage mixing on polyurethane asphalt and mineral aggregate; the first stage is to stir at 80-160 ℃ for 30-60 min, and the second stage is to add curing agent microcapsule at 80-160 ℃ and stir for 10-15 min; and (3) after the mixture is stirred, paving and rolling, releasing a curing agent by the microcapsule under the action of compaction load, and performing curing reaction on the curing agent and polyurethane asphalt for 4-8 hours to finally obtain the thermosetting polyurethane asphalt material.
The microcapsule preparation method adopts an in-situ polymerization method, requires that the prepared microcapsule has certain strength, is easy to disperse uniformly, and can stably exist at the temperature of 80-160 ℃. The microcapsule morphology and thermal stability of the microcapsules involved in the examples were tested, and the analysis results were as follows: the morphology of the microcapsules was observed using a Scanning Electron Microscope (SEM). The curing agent microcapsules are required to ensure heat resistance to avoid damage under high temperature construction conditions, and stability of the microcapsules is studied by thermogravimetric analysis.
As can be seen from FIG. 1, the microcapsules are in the shape of full spherical particles, uniform in particles and smooth in surface. The microcapsule has good overall dispersibility, no mass adhesion and agglomeration, shell breakage or cavity, and good tightness. The stability of the microcapsules was studied to find that only a small part of the mass was reduced when the temperature was below 90 ℃ and that the mass remained over 90% when the temperature was increased to 180 ℃. The polyurethane asphalt mixture containing the microcapsules after mechanical stirring at 160 ℃ is observed by a fluorescence microscope, and the microcapsules are uniformly distributed in the polyurethane asphalt and have good shape without cracking. It can be seen that the curing agent microcapsules have sufficient heat resistance and can withstand high temperature agitation and conditions.
Comparative example 1:
the thermosetting polyurethane asphalt material is prepared from the following raw materials in parts by mass: 1.1 parts of polyurethane prepolymer, 1.2 parts of asphalt, 0.6 part of compatilizer, 1.0 part of curing agent and 51.2 parts of mineral aggregate. The compatilizer is maleic anhydride, the curing agent is a mixture of ethylenediamine and 2-methylimidazole, and the ratio of the two is 2.5:1. the thermosetting polyurethane asphalt material in this comparative example adopts mineral aggregate grading AC-13.
Mixing polyurethane prepolymer, asphalt, curing agent and compatilizer at 80-160 ℃ to obtain polyurethane asphalt cement, mixing polyurethane asphalt and mineral aggregate at 80-160 ℃, curing at 60 ℃ and preserving for 4-6 hours to obtain the thermosetting polyurethane asphalt mixture.
Comparative example 2:
the thermosetting polyurethane asphalt material based on the microcapsule slow release technology comprises the following raw materials in parts by mass: 1.1 parts of polyurethane prepolymer, 1.2 parts of asphalt, 0.6 part of compatilizer, 1.0 part of curing agent microcapsule and 51.2 parts of mineral aggregate. The compatilizer is maleic anhydride, the curing agent is a mixture of ethylenediamine and 2-methylimidazole, and the ratio of the two is 2.5:1. the thermosetting polyurethane asphalt material in this comparative example adopts mineral aggregate grading AC-13.
The preparation method of the curing agent microcapsule material and the preparation method of the polyurethane prepolymer are the same as in example 1.
After the microcapsule preparation is completed, the preparation of the thermosetting polyurethane asphalt material is carried out based on a microcapsule slow release technology; mixing the polyurethane prepolymer, asphalt and a compatilizer at the temperature of 80-160 ℃ to obtain polyurethane asphalt cement; mixing polyurethane asphalt and mineral aggregate, and stirring at 80-160 ℃ for 40-80 min; and (3) after the mixture is stirred, paving and rolling, releasing a curing agent by the microcapsule under the action of compaction load, and performing curing reaction on the curing agent and polyurethane asphalt for 4-8 hours to finally obtain the thermosetting polyurethane asphalt material.
The marshall test, rutting test, immersion marshall test, freeze thawing split test, low Wen Xiaoliang bend test, etc. of the heat-curable polyurethane asphalt material of the examples were carried out according to the code "Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011)", respectively. The test results are shown in tables 1 and 2.
Table 1 table of the properties of the mixtures of example 1 and comparative examples 1, 2
| Example 1 | Comparative example 1 | Comparative example 2 | |
| Marshall stability (kN) at 60 DEG C | 52 | 56 | 48 |
| Dynamic stability at 60 ℃ (times/mm) | 18204 | 20450 | 17067 |
| -10 ℃ low temperature flexural tensile strain (mu epsilon) | 3036 | 3214 | 2880 |
| Stability of soaking residue (%) | 94 | 96 | 90 |
| Freeze-thaw split intensity ratio (%) | 91 | 92 | 87 |
After the curing agent microcapsule is mixed with the polyurethane asphalt and mineral aggregate, the curing reaction does not occur immediately, the initial setting time does not exist, the microcapsule breaks under the action of load in the construction rolling process, the curing agent is released, and the polyurethane asphalt starts to be cured. The curing reaction of polyurethane asphalt in the transportation process does not exist, and the problem that the material is too early hardened to be used continuously is avoided.
As compared with the comparative example 1, the thermosetting polyurethane asphalt material prepared by the microcapsule slow-release technology has less performance drop compared with the material prepared by directly adding the curing agent, and can fully play the advantages of the thermosetting asphalt material.
As a comparison of example 1 and comparative example 2, example 1 was carried out by mixing the polyurethane asphalt mixture in stages, adding the curing agent microcapsules in the second stage, and comparative example 2 was carried out by directly adding the curing agent microcapsules. As can be seen from Table 1, the polyurethane asphalt mixture containing the curing agent microcapsules in the second stage is superior to the polyurethane asphalt mixture containing the curing agent microcapsules directly in high-temperature stability, low-temperature crack resistance and water stability. The curing agent microcapsule is added in the initial mixing stage, so that part of the microcapsule is broken in advance, the mixture is solidified and hardened, and the performance is affected. The problem of early consolidation and hardening can be avoided by carrying out mixing in stages, the performance of the thermosetting polyurethane asphalt mixture is ensured, and the curing agent microcapsules are uniformly dispersed in the mixture.
Example 2:
the thermosetting polyurethane asphalt material based on the microcapsule slow release technology comprises the following raw materials in parts by mass: 1.1 parts of polyurethane prepolymer, 0.9 parts of asphalt, 0.3 parts of compatilizer, 0.8 parts of curing agent microcapsule and 44.4 parts of mineral aggregate. The compatilizer is maleic anhydride, the curing agent is a mixture of ethylenediamine and 2-methylimidazole, and the ratio of the two is 2.5:1. the thermosetting polyurethane asphalt material in this example adopts mineral aggregate grading AC-13.
The preparation and use methods of the curing agent microcapsule material, the preparation and health maintenance process of the thermosetting polyurethane asphalt material are the same as those of the embodiment 1.
Example 3:
a thermosetting polyurethane asphalt material based on microcapsule slow release technology comprises the following raw materials in parts by mass: polyurethane prepolymer 0.6 parts, asphalt 1.2 parts, compatilizer 0.4 parts, curing agent microcapsule 0.5 parts and mineral aggregate 40 parts. The compatilizer is maleic anhydride, and the curing agent is a mixture of ethylenediamine and 2-methylimidazole. The thermosetting polyurethane asphalt material in this example adopts mineral aggregate grading AC-13.
The preparation and use methods of the curing agent microcapsule material, the preparation and health maintenance process of the thermosetting polyurethane asphalt material are the same as those of the embodiment 1.
Table 2 table of the properties of the mixtures of example 1, example 2 and example 3
In example 1, the asphalt phase and the resin phase exist in an interpenetrating form, the cured resin phase has a cross-linked space structure, and compared with the asphalt phase, the resin phase has higher strength and capability of resisting crack propagation, and the asphalt phase has better plasticizing effect. Example 3 is a thermosetting polyurethane asphalt material with a resin phase as a main material, asphalt phase particles are filled in a resin network, the resin network is not destroyed, and the strength of the material is higher, so that the material in example 3 shows higher high-temperature stability and water stability, but the toughness contribution of the resin relative to the material is smaller, and therefore, the cracking resistance is poorer at low temperature. In the thermosetting polyurethane asphalt material with asphalt phase as main component in example 3, the dispersed resin condensate is distributed in asphalt phase in the form of gel micelle, and the micelles are connected by weak chain segments or are completely isolated by asphalt phase, so that the resin phase has certain contribution to the strength of the material, but has poorer high-temperature stability and water stability than those in examples 1 and 2, but has better toughness due to the obvious plasticizing effect of asphalt and better low-temperature crack resistance due to the small resin content. In actual engineering, proper material mixing proportion is selected according to engineering requirements according to local conditions, so that better performance of the material is realized.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the scope of the present application, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present application.
Claims (5)
1. The thermosetting polyurethane asphalt material based on microcapsule slow release technology is characterized in that: the thermosetting polyurethane asphalt material comprises the following raw materials in parts by mass,
0.3-1.2 parts of curing agent microcapsule;
0.6-1.1 parts of polyurethane prepolymer;
0.9-1.2 parts of asphalt;
0.1-0.7 parts of compatilizer;
30-60 parts of mineral aggregate;
the preparation method of the thermosetting polyurethane asphalt material comprises the following steps: after the preparation of the curing agent microcapsule and the polyurethane prepolymer is completed, the preparation of the thermosetting polyurethane asphalt material is carried out based on a microcapsule slow release technology; mixing the polyurethane prepolymer, asphalt and a compatilizer at 80-160 ℃ to obtain polyurethane asphalt cement, and carrying out two-stage mixing on polyurethane asphalt and mineral aggregate; the first stage is to stir at 80-160 ℃ for 30-60 min, and the second stage is to add curing agent microcapsules at 80-160 ℃ and stir for 10-15 min; the microcapsule releases a curing agent during construction rolling, and the curing agent and polyurethane asphalt undergo a curing reaction to finally obtain a thermosetting polyurethane asphalt material;
the polyurethane prepolymer is prepared by reacting polyether polyol, diphenylmethane diisocyanate and a chain extender 1, 4-butanediol; the preparation method of the polyurethane prepolymer comprises the steps of adding a polyether polyol compound into a reaction kettle, vacuumizing and dehydrating for 2-4 hours at the temperature of 100-120 ℃, cooling to 60-70 ℃, and then adding diphenylmethane diisocyanate and a chain extender 1, 4-butanediol, wherein the proportion of the polyether polyol to the diphenylmethane diisocyanate to the chain extender 1, 4-butanediol is 1:2:0.5, under the protection of nitrogen, reacting at 60-90 ℃ for 4h, and cooling to about 60 ℃ to obtain polyurethane prepolymer; the curing agent microcapsule comprises a core material and a wall material, wherein the core material comprises one or more of ethylenediamine and 2-methylimidazole, and the wall material comprises one or more of phenolic resin, urea-formaldehyde resin unsaturated polyester resin and polymethyl methacrylate resin;
the preparation method of the curing agent microcapsule comprises the following steps,
preparing the wall material into a prepolymer, preparing the core material into emulsion, mixing the emulsion and the prepolymer at the temperature of 60-80 ℃, stirring at the speed of 300r/min for 16-20 h, reacting the prepolymer to generate an insoluble reticular crosslinked network, and coating the core material to form the microcapsule.
2. The microcapsule sustained release technology-based thermosetting polyurethane asphalt material as defined in claim 1, wherein: the asphalt is 70# or 90# matrix asphalt.
3. The microcapsule sustained release technology-based thermosetting polyurethane asphalt material as defined in claim 1, wherein: the compatilizer is maleic anhydride.
4. The microcapsule sustained release technology-based thermosetting polyurethane asphalt material as defined in claim 1, wherein: the mineral aggregate has grading characteristics, and the grading type can be any one of AC-13, SMA-13 or OGFC-13.
5. The microcapsule sustained release technology-based thermosetting polyurethane asphalt material as defined in claim 1, wherein: the thermosetting polyurethane asphalt material can be applied to paving cement concrete bridge decks and steel bridge decks, paving and repairing airport pavement and asphalt pavement, and special road sections of intersections and stop stations.
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| CN102617070A (en) * | 2012-03-23 | 2012-08-01 | 重庆市智翔铺道技术工程有限公司 | Polyurethane asphalt concrete as well as preparation method and application thereof |
| CN104987736A (en) * | 2015-07-06 | 2015-10-21 | 交通运输部公路科学研究所 | Epoxy asphalt microcapsule material and application |
| CN110551401A (en) * | 2019-09-30 | 2019-12-10 | 山西省交通科技研发有限公司 | Asphalt regenerant with slow release function and preparation method thereof |
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| CN115073044A (en) | 2022-09-20 |
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