KR20160000995A - Self-healing asphalt containing microcapsules - Google Patents

Abstract

The present invention relates to a microcapsule-containing self-healing asphalt having a crack-preventing function, and more particularly, to a microcapsule-containing self-healing asphalt which has cracks in an asphalt when microcapsules filled with a core as an auto- The self-healing agent in the microcapsule flows out to the cracking site as the microcapsule on the crack line bursts, and the self-healing asphalt which can prevent further cracking due to the sealing of the crack due to the macromolecularization by the natural polymerization initiator, .

Description

Self-healing asphalt containing microcapsules < RTI ID = 0.0 >

More particularly, the present invention relates to a self-healing asphalt having a crack-preventing function. Specifically, microcapsules are introduced into ordinary asphalt and mixed with asphalt at high temperature. When the microcapsules are mixed with the asphalt, microcapsules are dispersed in the asphalt, When the microcapsules are formed, the microcapsules are broken together, the contents in the microcapsules flow out to fill the cracks, and the contents filled in the cracks are polymerized by the elements of the natural system without catalyst to form the hard polymer, Self-healing asphalt containing microcapsules which allows the microcapsules to be restored to its original shape, i.e. self-healing.

All substances are to be withdrawn or aged after a long period of time. The reason for this is that materials are subject to various physical, mechanical, chemical and biological attacks during use, causing damage to the interior and surface of the material. The most common fracture is cracks. This destruction is due to the mechanical vulnerability of the material being attacked, and to the structure made of this material, causing dysfunction and eventually ending up in life due to premature aging. For this reason, recovery measures must be taken as soon as the destruction occurs in order to prevent the material from further destruction and extend the service life. So, if possible, it should be returned to its original form.

If a particular area, for example, a ship outer metal, is damaged, the ship may eventually be destroyed in space. In order to prevent this, the space shuttle must be sent to repair the outer casing crack. This task is costly and requires the ship to stop functioning for a while.

Many scientists have been studying possible ways to repair trauma of materials by microcracks over the past several decades. In US Pat. No. 6,518,330 and US Pat. No. 6,858,659, microcapsules were made with liquid dicyclopentadiene as the core and urea-formaldehyde resin as the shell. This microcapsule was introduced into an epoxy resin matrix together with a groove catalyst (Grubb catalyst). When a mechanical impact is applied to this plate, cracks are generated in the plate, the microcapsules on the crack line are destroyed, the contents (dicyclopentadiene) flow out to the cracked portion, And the polymerization is carried out, and the polymerized polycydicyclopentadiene, which has been solidified, is restored to its original shape by filling up the cracked portion. The substance was self-healing (self-healing).

Another US patent (USP 20010050032) proposes a method of manufacturing a matrix reinforced with self-healing hollow fibers filled with a monomer such as styrene which can be a polymer. However, it has been reported that the hollow fiber has lower recovery than the microcapsules containing the same monomer in the mechanical plane (strength, etc.).

(JWC Pang and IP Bond, "A hollow fiber reinforced polymer composite encompassing self-healing and enhanced damage visibility", Composite Science and Technology, 65, 1791-1799, 2005) It describes the process of self-healing. Here, the microtubes reported that the epoxy plate could easily break and also had a greater mechanical loss than the degradation of the mechanical properties that might occur when the microcapsules were introduced into the epoxy plate.

All of the self-healing methods described in the above cited documents require polymerization catalysts. However, these catalysts are already known to lack stability and are dangerous to handle and harmful to the environment. In addition, it is too contingent to meet polymerization with a catalyst dispersed spatially in microtubule or microcapsule cores.

Asphalt concrete is a mixture of asphalt binder and aggregate mixed at high temperature (about 180 ℃) and forms an asphalt pavement. However, due to the molecular breaks due to ultraviolet rays and the oxidation reaction between oxygen and asphalt hydrocarbons, the formation of oxides (ketones, carboxylic acids, etc.) will result in brittleness. Asphalt concrete becomes hard and loose, and the asphalt binder changes easily. In this case, microcracks (≤7.5 mm) are generated in the asphalt binder due to the traffic load, and the cracks between the aggregate and the asphalt binder cause the aggregate that the asphalt binder does not catch on the surface of the pavement ravelling, and eventually a large hole pothole is formed and the road begins to crumble.

Currently, there is no technology to prevent micro cracks from sealing in asphalt pavement to prevent further cracking. Up to now, it has been necessary to treat the asphalt surface with a sealant that protects the asphalt surface from degradation of environmental properties and moisture penetration on the surface of the asphalt for the purpose of repairing the generated cracks, or to recover the original ratio of asphalt and malt, The surface of the asphalt is treated with a rejuvenator which is designed to convert the physical properties of the asphalt into the original asphalt properties. However, these drugs work only on the asphalt surface and also have the disadvantage that the road slides easily. Another problem is that they are for crack repair purposes and not for crack prevention purposes. Recently, a method of repairing cracks using a magnetic field has been introduced. A. Garcia, M. Bueno, and M. Gilbert, "Crack repair of asphalt concrete with induction energy", HERON, 56, 33-43, 2011. A. Garcia, E. Schlangen, M. van de Ven and D. van Vliet, This method involves introducing conductive fibers (iron or copper metal fibers or graphite) into the asphalt concrete, and introducing conductive fibers (iron or copper metal fibers or graphite) into the asphalt concrete If cracks occur in the asphalt concrete pavement over time, the magnetic field generating device generating the high frequency magnetic field is brought close to the pavement surface to cause the conductive fibers in the asphalt concrete to generate heat. When the asphalt becomes 30 ° C to 70 ° C, ), And accordingly, they have adhesiveness, so that the crack interfaces are stuck to each other to repair cracks. However, this method is a crack repair method, not a crack prevention method. It is also not a self-healing method that requires autonomy in the sense that it requires human assistance (humans must drag a massive magnetic field generator to the asphalt road surface).

(1) United States Patent USP 6,518,330 (2) U.S. Pat. No. 6,858,659 (3) US patent USP 20010050032

(1) (J. W. C. Pang and I.P. Bond, "A hollow fiber reinforced polymer composite encompassing self-healing and enhanced damage visibility", Composite Science and Technology, 65, 1791-1799, 2005) A. Garcia, E. Schlangen, M. van de Ven and D. van Vliet, "Crack repair of asphalt concrete with induction energy", HERON, 56, 33-43, 2011. A. Garcia, M. Bueno, JN Contreras and MN Part 1, "Induction healing of dense asphalt concrete ", Construction and Building Materials, 49, 1-7,

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a microcapsule in which microcracks are formed on an asphalt surface by incorporating microcapsules into asphalt, Self-healing agent) flows into the cracks and is polymerized by the elements of the natural system to fill the cracks to prevent further crack growth and prevent further cracks, and protects the environment from the use of harmful substances such as polymerization catalysts The present invention provides a self-healing asphalt containing microcapsules which is produced by using microcapsules for the purpose of preventing cracks.

In order to achieve the above object, the present invention provides a self-healing asphalt which can be produced and used simply and economically. Self-healing of asphalt is carried out by elements of nature without polymerization catalyst, and the polymerization is practically ensured without contradiction.

Firstly, the object is achieved by microencapsulating a self-emulsifying compound which is polymerized by a reaction initiator which is permanently present in the asphalt external environment. In order to heal the cracks in the asphalt, the self-healing agent becomes a polymer forming the core of the microcapsule which can break down and has a self-worthy owing to filling the cracks. When the microcapsules are destroyed and flowed out, the self-healing agent becomes a polymer by the polymerization initiator existing in the natural environment of the asphalt without the polymerization catalyst, and restores the asphalt almost to its original shape.

Secondly, the above object is achieved by introducing into the asphalt microcapsules containing a self-healing agent in the core. The microcapsules incorporated in the asphalt are destroyed along with the asphalt cracks, so that the contents (self-healing agent) in the microcapsules flow to the cracks and are polymerized by the natural elements to fill the cracks to prevent further microcrack growth.

Therefore, the present invention relates to a self-healing agent which can be polymerized by a polymerization initiator present in nature without a polymerization catalyst, a process of microencapsulating the microcapsule, and a microcapsule containing the self-healing agent are used for realizing self-healing asphalt .

That is, the self-healing asphalt of the present invention containing microcapsule wool

1) self-healing agent selection step,

2) microencapsulating the selected self-healing agent,

3) heating the asphalt to 150 ° C to 180 ° C,

4) adding microcapsule wool to asphalt heated to 150 ° C to 180 ° C and stirring for 1 to 3 hours, the above problem can be solved.

According to the present invention, when microcracks are formed in asphalt by incorporating microcapsules in the asphalt, the self-healing agent flows out from the microcapsules destroyed together with the asphalt, and the microcracks are healed Thereby preventing a larger crack from occurring.

Also, the microcapsule acts as an asphalt reinforcing material to improve the rigidity and toughness of the asphalt, thereby reinforcing the physical properties of the asphalt.

In this way, self-healing asphalt is formed, which has strong physical properties at the beginning of the use of asphalt pavement, prevents cracks and prolongs the life of the pavement, protects the environment (reduces raw materials and uses harmful polymerization catalysts), and is used for asphalt pavement and maintenance The cost can be remarkably reduced.

1 shows the asphalt self-healing process by the self-emulsifying oily microcapsule according to the present invention.
Figure 2 shows the shape of self-emulsifying oily microcapsules prepared in the laboratory according to the present invention.
FIG. 3 shows a self-healing process in which microcapsules embedded in asphalt according to the present invention are broken at the same time as breaking (cracking) occurs in the asphalt, and the self-healing agent as its content flows out.
FIG. 4 shows a sample preparation process of an impact strength test for measuring the self-healing efficiency of self-healing asphalt containing microcapsules according to the present invention, wherein 1 is original sample, 2 is cutting, 3 is the connection, and 4 is the irradiated sample.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In order to solve the above problems and to satisfy the conditions for preventing cracks, the present invention uses a microcapsule as an inner material of the self-healing material and mixes the heated self-healing material with the heated asphalt to mix the self-healing asphalt containing microcapsules , Microcracks in the asphalt are broken, and microcapsules on the crack growth line are blown out, causing the microcapsule material to flow to the cracking site, and the polymer is initiated by the polymerization initiator of the natural system to fill up the cracks, thereby preventing further cracking of the asphalt The present invention also provides a method for producing self-healing asphalt which can prevent the asphalt. The self-healing process is described with reference to FIG.

A feature of the present invention is achieved by newly combining the following two materials. The first is a substance in a microcapsule that can be spontaneously polymerized without polymerization catalyst, which is composed of at least one selected, polymerizable compound and can bind to a substance that can easily break down and self-heal the substance. , Which is a spontaneous polymerization initiator capable of self-healing a substance that is easily broken down without a polymerization catalyst.

According to the present invention, a spontaneous polymerization initiator for the reaction of a substance in a microcapsule, which is a compound capable of being polymerized without a polymerization catalyst in combination with a substance to be self-healing, is composed of atmospheric oxygen, atmospheric moisture, Or a plurality is selected. These spontaneous polymerization initiators are always present in nature and are immediately utilized in polymerizing microcapsules.

The polymerizable and self-healing liquid composition according to the present invention is composed of one or more of monomers, oligomers and prepolymers according to the necessary natural polymerization initiator.

Polymerization by Atmospheric Oxygenation

According to the present invention, the polymerization initiator always present in nature is oxygen in the atmosphere. A composition that is microencapsulated, that is, forms a microcapsule core, is composed of a compound that undergoes spontaneous polymerization by oxygen in the atmosphere. These compounds are liquids, and include monomers such as dimethylphenol, linoleic acid, linoleic acid, ricinoleic acid, and oleic acid, and oligomers and prepolymers obtained therefrom. One or more of these liquid compounds are selected to form microcapsules. At this time, the shell of the microcapsule should not be harmed by the oxygen in the prey, the moisture in the atmosphere, and ultraviolet rays in the atmosphere before being destroyed.

Polymerization by Atmospheric Moisture

According to the present invention, the polymerization initiator always present in the natural world is moisture in the air. A composition that is microencapsulated, that is, a microcapsule core, is composed of a compound capable of spontaneous polymerization by moisture in the air. These compounds are liquid, and examples of the isocyanate system include monomers such as methylene diphenyl diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, naphthalene diisocyanate, and isophorone diisocyanate. Examples of the silane type include vinyl trimethoxysilane, There may be mentioned monomers such as methoxy silane, glycidoxypropyl trimethoxy silane, mercaptopropyl trimethoxy silane, and tetraethoxy silane. Examples of the cyanoacrylate system include methyl cyanoacrylate, ethyl cyanoacrylate, Diethylphenylene biscyanoacrylate, ethyl chloromethoxyphenyl cyanoacrylate, ethyl chlorotrifluoromethylphenyl cyanoacrylate, and the like. One or more of these monomers and oligomers and prepolymers obtained from these monomers are selected and are incorporated into microcapsules. At this time, the shell of the microcapsule should be free from oxygen in the atmosphere, moisture in the atmosphere, and ultraviolet light in the atmosphere before it is destroyed.

Polymerization by Atmospheric UV

According to the present invention, the polymerization initiator always present in the natural world is ultraviolet rays in the atmosphere. The composition to be microencapsulated is composed of a compound which undergoes spontaneous polymerization by ultraviolet rays. These compounds are liquid. Examples of the acrylic system include monomers such as methyl acrylate, ethyl acrylate, styryl acrylate, allyl acrylate, lauryl acrylate, diethylene glycol diacrylate, butanediol diacrylate, and glycerol triacrylate Examples of the methacrylate system include methyl methacrylate, glycidyl methacrylate, isopropyl methacrylate, butyl methacrylate, triethylene glycol dimethacrylate, propanediol dimethacrylate, butanetriol tri And monomers such as methacrylate. As the compound capable of spontaneous polymerization, one or more of these monomers and oligomers and prepolymers obtained from these monomers are selected. Acrylic and methacrylic compounds require free radical photopolymerization by ultraviolet light, and therefore photoinduced agents capable of producing radicals are needed. As the photoinitiator, one or more of hydroxycyclohexyl phenyl ketone, benzophenone, hydroxymethylphenylpropanone dimethoxyphenylacetophenone, and phosphine oxide is selected. They fill the inside of the microcapsule with acrylic or methacrylic compounds. In this case, 1 to 10% (weight ratio) of acrylic or methacrylic compound is used as the photoinitiator. The preferred weight ratio is 1 to 5%. The film of the microcapsules made here should not be harmed by oxygen in the atmosphere, moisture in the atmosphere, and ultraviolet light in the atmosphere.

Methods for microencapsulation of a composition capable of spontaneous polymerization include emulsion polymerization using interfacial polymerization, nasal diffusion process, sol-gel process, and the like.

Examples of the resin forming the shell of the microcapsule include epoxy resin, phenol / formaldehyde resin, urea / formaldehyde resin, melamine / formaldehyde resin, urea / melamine / formaldehyde resin, polyurethane resin, polyurea resin, A polyamide resin, and a polymethyl methacrylate resin.

Microcapsulation of the spontaneously polymerizable composition causes gold (cracks) in the asphalt and at the same time the microcapsules are destroyed and the spontaneous polymerizable composition inside the microcapsules flows out and spontaneously polymerizes by the polymerization initiator present in the natural system, ) And the asphalt is self-healing.

The microcapsules containing the self-healing polymerizable composition according to the present invention in the inner (inner) range from 5 to 500 mu m in diameter. If the diameter is 30μm or less, it is difficult to destroy the asphalt at the same time. The size of self-healing microcapsules is 50 μm to 250 μm in diameter.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, it should be understood that the present invention is not limited thereto.

Example 1

Microencapsulation of Monomer Dimethylphenol by Emulsion Polymerization:

Microcapsule core - Self-healing polymerizable compound dimethylphenol

Microcapsule Shell - Urea / Formaldehyde Resin

Natural Polymerization Initiator - Atmospheric Oxygen

200 ml of distilled water, 2.2 g of polyvinyl alcohol and 0.5 g of sodium dodecylsulfoxide were placed in a 1000 ml reaction tank and stirred at 80 ° C and 400 rpm for 1 hour to obtain transparent emulsified water. 2 g of triethylenetetraamine and 5 g of solid dimethylphenol are added to another 100 ml beaker and stirred at 20 DEG C and 400 rpm for 1 hour to obtain a liquid dimethylphenol constituting the core of the microcapsule.

10 g of urea and 10 g of formaldehyde (26.46 ml of 35% formalin solution) are added to another 100 ml beaker and stirred at 70 ° C at 400 rpm to obtain a prepolymer constituting a microcapsule shell.

Liquid dimethylphenol prepared in a 1,000 ml reaction tank containing emulsified water was charged and stirred at 70 ° C and 400 rpm for 3 hours to obtain microcapsules whose core was liquid dimethylphenol and whose shell was formed from urea / formaldehyde resin. The microcapsules are washed with 10% aqueous methanol solution and dried in a vacuum oven for 5 hours before use. The shape of the obtained microcapsules was a round sphere and the diameter was usually in the range of 10 to 400 μm (see FIG. 2).

An appropriate amount of asphalt is added to a kettle heated to 150 ° C., microcapsules corresponding to the weight of asphalt 5% to 40% are added, and the mixture is stirred at 400 rpm for 1 hour to prepare self-healing asphalt containing microcapsules.

When an impact is applied to the microcapsule by the asphalt cracking, the microcapsule is blown, and the dimethylphenol therein flows to the cracking site and the polymerization is initiated by the oxygen in the atmosphere, so that the polymerized polymer (polydimethylphenol) 3 and Fig. 1). So the asphalt was healed.

Example 2

Microencapsulation of monomeric isophorone diisocyanate by emulsion polymerization:

Microcapsule core - Self-healing polymerizable compound, isophorone diisocyanate

Microcapsule Shell - Urea / Formaldehyde Resin

Natural Polymerization Initiator - Atmospheric Moisture

The emulsified water is obtained in the same manner as in Example 1.

A precursor for external use of microcapsules was obtained in the same manner as in Example 1.

5 g of isophorone diisocyanate was stirred for 10 minutes in the emulsion water in the same manner as in Example 1, and then the precursor was added thereto and stirred for 3 hours to prepare microcapsules having isophorone diisocyanate core and urethane / Capsules are obtained. Microcapsular microcapsules were observed to have a spherical shape with a diameter ranging from 10μm to 400μm.

An appropriate amount of asphalt is added to a kettle heated to 150 ° C., microcapsules corresponding to the weight of asphalt 5% to 40% are added, and the mixture is stirred at 400 rpm for 1 hour to prepare self-healing asphalt containing microcapsules.

When the microcapsules are impacted by the cracks generated in the asphalt, the microcapsules are blown and the isophoronediisocyanate in the microcapsules flows to the cracks, and the isocyanate groups are hydrolyzed by the moisture in the atmosphere to be converted into amine groups, and then the amine groups and isocyanate groups react The polymerized polymer (polyurea) blocks the cracks. So the asphalt was healed.

Example 3

Microencapsulation of Monomer Glycidyl Methacrylate by Emulsion Polymerization:

Microcapsule core - self-healing polymerizable compound glycidyl methacrylate

Microcapsule shell - urea / formaldehyde resin

Natural polymerization initiator - Atmospheric UV

0.05 g of benzophenone was added to 5 g of glycidyl methacrylate in another 100 ml beaker and stirred at 20 ° C and 200 rpm for 10 minutes to obtain a liquid monomer for microencapsulation inside.

A microcapsule shell precursor was obtained in the same manner as in Example 1.

In the same manner as in Example 1, the liquid monomer was added to the emulsified water and stirred for 10 minutes. Then, the precursor was added thereto and stirred for 3 hours to prepare a solution having a core of glycidyl methacrylate and a shell of urea / formaldehyde resin To obtain a microcapsule. Microcapsular microcapsules were observed to have a spherical shape with a diameter ranging from 10μm to 400μm.

An appropriate amount of asphalt is added to a kettle heated to 150 ° C., microcapsules corresponding to the weight of asphalt 5% to 40% are added, and the mixture is stirred at 400 rpm for 1 hour to prepare self-healing asphalt containing microcapsules.

When the microcapsules are impacted by the cracks generated in the asphalt, the microcapsules are blown and glycidyl methacrylate flows into the cracks and the benzophenone forms radicals due to ultraviolet rays (wavelength: 200 to 450 nm) in the atmosphere The polymer (polyglycidyl methacrylate) polymerized by photopolymerizing the radical glycidyl methacrylate blocks the crack. So the asphalt was healed.

Example 4

Microencapsulation of two monomers hexamethylene diisocyanate and methyl methacrylate by emulsion polymerization:

Microcapsule core - self-healing polymerizable compounds hexamethylene diisocyanate and methyl methacrylate

Microcapsule Shell - Urea / Formaldehyde Resin

Natural Polymerization Initiator - Atmospheric Moisture and UV

So far, according to the experimental results, the polymerization reaction by moisture (moisture) in the atmosphere is the fastest, the next is the polymerization by ultraviolet rays, and the last is the polymerization by oxygen. Therefore, this time, experiments were carried out simultaneously using moisture in the air and ultraviolet rays as a polymerization initiator. (Moisture is the main polymerization initiator on the cloudy day and sunlight (ultraviolet ray) acts as the main polymerization initiator on a clear day.)

The emulsified water is obtained in the same manner as in Example 1.

A precursor for external use of microcapsules was obtained in the same manner as in Example 1.

In the same manner as in Example 1, 2.5 g of hexamethylene diisocyanate, 2.5 g of methyl methacrylate and 0.025 g of benzophenone were added to the emulsified water and stirred for 10 minutes. The precursor was added thereto and stirred for 3 hours to obtain hexamethylene diisocyanate And methyl methacrylate, and the outer layer is formed of a urea / formaldehyde resin. The shape of the microcapsules observed by the microscope was a round sphere and its size was usually in the range of 10 μm to 400 μm in diameter.

An appropriate amount of asphalt is added to a kettle heated to 150 ° C., microcapsules corresponding to the weight of asphalt 5% to 40% are added, and the mixture is stirred at 400 rpm for 1 hour to prepare self-healing asphalt containing microcapsules.

When an impact is applied to the microcapsule due to the crack generated in the asphalt, the microcapsule blows, and the hexamethylene diisocyanate and methyl methacrylate therein flow to the cracking site, and the polymer blend (polyurea + Polymethylmethacrylate) will fill the cracks. So the asphalt was healed.

Example 5

100 g of asphalt (AP-5, penetration degree 60 to 70) was added to a kettle heated to 150 DEG C and stirred for 5 minutes. Then, 10 g of the microcapsules prepared in Example 4 was added and stirred at 400 rpm for 1 hour to obtain microcapsules Self-healing asphalt is obtained. This was poured into a mold for measuring the impact strength to prepare a test sample. Seven test samples were prepared for each condition. The prepared sample is cut and re-attached to the notched portion by a machine, and then irradiated for 9 seconds to 216 seconds in a UV irradiator. The irradiated specimens are tested with an impact strength tester to calculate the impact strength and the resulting self-healing efficiency (see FIG. 4 for preparing the impact strength specimen). The results are shown in Table 1 below.

In addition, the self-healing efficiency was calculated according to the following equation (1).

Here, the self-healing efficiency (%) value means self-healing by that percentage, and if the value is 100 or more, it means that the part of the crack has completely recovered, that is, it is completely self-healing.

The UV irradiator used is a medium pressure mercury lamp with a wavelength of 300-450 nm and a dose of 72 mW / cm ² per ^second . In Korea, the daily average UV exposure dose is 15,500 mW / cm ² due to sunlight. This means that the irradiation for 9 seconds in the UV irradiator is the same as the irradiation for 1 hour in the field (sunshine).

As shown in Table 1, the self-healing asphalt containing microcapsules of the present invention exhibited a self-healing efficiency of 100% after 216 seconds of exposure to UV light. The impact strength of the self-healing asphalt was 4.62 J / m, which was slightly higher than that of the original sample. This means that the microcapsule-containing asphalt is fully self-healing when exposed to sunlight 24 hours a day outdoors.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (4)

The microcapsule-containing self-healing asphalt according to claim 1, wherein the microcapsule-containing asphalt is produced by adding a microcapsule composed of a compound which is initiated polymerization by a natural factor without a polymerization catalyst, and a microcapsule formed of a superficial material surrounding the inherent substance. The self-healing asphalt-containing microcapsule as set forth in claim 1, wherein the natural factor comprises oxygen in the air, water in the air, or ultraviolet light in the atmosphere as a polymerization initiator. [3] The method according to claim 1, wherein the inherent substance is a compound which is polymerized by a natural polymerization initiator,
When the compound is spontaneously polymerized by oxygen in the air, it is preferable to use one or more monomers selected from the group consisting of dimethylphenol, linoleic acid, linoleic acid, lithinoleic acid, and oleic acid, oligomers obtained from these monomers, Containing polymer,
In the case of a compound capable of spontaneous polymerization by moisture in the air, methylene diphenyl diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, naphthalene diisocyanate and isophorone diisocyanate are used as the isocyanate system, vinyltrimethoxysilane , Aminopropyltrimethoxysilane, glycidoxypropyltrimethoxysilane, mercaptopropyltrimethoxysilane, and tetraethoxysilane, and cyanoacrylate systems include methyl cyanoacrylate, ethyl cyanoacrylate, One or more monomers selected from monomers of diethylphenylene biscyanoacrylate, ethyl chloromethoxyphenyl cyanoacrylate, and ethyl chlorotrifluoromethylphenyl cyanoacrylate, oligomers obtained from these monomers, Polymer, or
In the case of a compound which can undergo spontaneous polymerization by ultraviolet rays in the atmosphere, examples of the acryl system include methyl acrylate, ethyl acrylate, stearyl acrylate, allyl acrylate, lauryl acrylate, diethylene glycol diacrylate, butanediol diacrylate, And glycerol triacrylate, and the methacrylate-based ones include methyl methacrylate, glycidyl methacrylate, isopropyl methacrylate, butyl methacrylate, triethylene glycol dimethacrylate, propanediol dimethacrylate, And one or more monomers selected from monomers of butane triol trimethacrylate, and oligomers and prepolymers obtained from these monomers, and self-healing asphalt containing microcapsules. [3] The method according to claim 1, wherein the outer material is at least one selected from the group consisting of an epoxy resin, a phenol / formaldehyde resin, a urea / formaldehyde resin, a melamine / formaldehyde resin, a urea / melamine / formaldehyde resin, Wherein the microcapsule-containing asphalt comprises at least one selected from a polyurethane resin, a polyurea resin, a polyamide resin and a polymethyl methacrylate resin.

Images