Epoxy resin self-repairing material with mixed asphalt for large-span steel bridge deck and preparation method of epoxy resin self-repairing material

Abstract

The invention relates to the technical field of self-repairing materials, in particular to an epoxy resin self-repairing material with mixed asphalt for a large-span steel bridge deck and a preparation method of the epoxy resin self-repairing material. The epoxy resin self-repairing material comprises the following components in percentage by weight: 40-60% of an epoxy resin matrix, 20-40% of mixed asphalt, 5-15% of a self-repairing material and 5-10% of an additive, by introducing a self-repairing material composed of self-repairing microcapsules or self-repairing fibers, when the material is damaged, a repairing agent can be automatically released, part of mechanical properties are recovered, the maintenance requirement is remarkably reduced, and the service life is prolonged; the weather resistance, flexibility and high-temperature stability of traditional asphalt are improved, the overall performance of the material can be remarkably enhanced after the material is mixed with an epoxy resin matrix, part of mechanical performance of the material can be automatically recovered after the material is damaged by introducing a self-repairing mechanism according to the technical scheme, the maintenance requirement is remarkably reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of self-healing materials, and particularly to an epoxy resin self-healing material with mixed asphalt for the deck of long-span steel bridges and a preparation method thereof. Background Art

[0002] As an important part of modern transportation infrastructure, the deck materials of long-span steel bridges need to withstand complex and variable loads and environmental conditions. Traditional deck paving materials, such as ordinary asphalt concrete or single epoxy resin materials, often show problems such as easy cracking and severe wear when facing periodic traffic loads, extreme climate conditions, and aging phenomena under long-term use, which require frequent maintenance, increasing the maintenance cost and potential safety hazards.

[0003] Epoxy resin is widely used in deck paving due to its excellent adhesion, high strength, and chemical corrosion resistance. However, it has relatively high brittleness and is prone to cracking at low temperatures, which limits its application under extreme climate conditions. Although the addition of mixed asphalt can effectively improve the weather resistance and flexibility of the material, it still cannot solve the problem of self-healing after material damage. Summary of the Invention

[0004] The purpose of the present invention is to provide an epoxy resin self-healing material with mixed asphalt for the deck of long-span steel bridges and a preparation method thereof, to solve the disadvantages of epoxy resin in deck paving, such as relatively high brittleness and easy cracking at low temperatures. Although the addition of mixed asphalt can effectively improve the weather resistance and flexibility of the material, it still cannot solve the problem of self-healing after material damage.

[0005] To achieve the above purpose, the present invention provides an epoxy resin self-healing material with mixed asphalt for the deck of long-span steel bridges. The epoxy resin self-healing material with mixed asphalt for the deck of long-span steel bridges comprises the following components by percentage: 40%-60% of epoxy resin matrix, 20%-40% of mixed asphalt, 5%-15% of self-healing material, and 5%-10% of additives. The epoxy resin matrix is preferably bisphenol A epoxy resin, the mixed asphalt is preferably styrene-butadiene-styrene modified asphalt, the self-healing material is one of self-healing microcapsules or self-healing fibers, and the additives include fillers, pigments, and stabilizers.

[0006] Among them, when the self-healing material is self-healing microcapsules, the self-healing microcapsules are preferably materials with polyurethane prepolymer as the repair agent and a thermoplastic polymer as the shell;

[0007] When the self-healing material is self-healing fibers, the self-healing fibers are fibers containing epoxy resin monomers.

[0008] Among them, the filler is preferably one or more of calcium carbonate and wollastonite;

[0009] The stabilizer includes an antioxidant and an ultraviolet absorber.

[0010] The present invention also provides a preparation method of an epoxy resin self-healing material with hybrid asphalt for a long-span steel bridge deck, which is used to prepare the epoxy resin self-healing material with hybrid asphalt for a long-span steel bridge deck as described above, and includes the following steps:

[0011] Add styrene-butadiene-styrene polymer to the base asphalt for modification to obtain the hybrid asphalt;

[0012] Put the obtained hybrid asphalt and the epoxy resin matrix into a reaction vessel, heat to 140°C - 160°C, and continuously stir during the heating process;

[0013] Under the condition of maintaining stirring, slowly add the self-healing material so that the self-healing material is evenly mixed with the mixture of the hybrid asphalt and the epoxy resin matrix;

[0014] Under the condition of maintaining stirring, gradually add the filler, the pigment and the stabilizer so that the filler, the pigment and the stabilizer are evenly mixed with the mixture in the reaction vessel to obtain a composite material;

[0015] After cooling, curing and surface treatment of the prepared composite material, the epoxy resin self-healing material with hybrid asphalt for a long-span steel bridge deck is obtained.

[0016] Among them, the specific steps of the step "Add styrene-butadiene-styrene polymer to the base asphalt for modification to obtain the hybrid asphalt" are as follows:

[0017] Add styrene-butadiene-styrene polymer to the hot asphalt, and under the conditions of heating and stirring, make it fully dissolve to obtain a modifier solution;

[0018] Slowly add the modifier solution to the base asphalt, and under the conditions of heating and stirring, make the modifier fully react with the base asphalt to form a uniform mixture;

[0019] After the mixing reaction is completed, let the mixture stand at room temperature for 24 hours to obtain the hybrid asphalt.

[0020] Among them, in the step "Put the obtained hybrid asphalt and the epoxy resin matrix into a reaction vessel, heat to 140°C - 160°C, and continuously stir during the heating process", the stirring speed is controlled at 50 - 100 revolutions per minute, and the stirring duration is 30 - 60 minutes.

[0021] Among them, in the step of "slowly adding the self-healing material under the condition of maintaining stirring, so that the self-healing material is uniformly mixed with the mixture of the hybrid asphalt and the epoxy resin matrix", the stirring speed is controlled at 50-100 revolutions per minute, and the stirring duration is 60-90 minutes.

[0022] Among them, in the step of "gradually adding the filler, the pigment and the stabilizer under the condition of maintaining stirring, so that the filler, the pigment and the stabilizer are uniformly mixed with the mixture in the reaction vessel to obtain a composite material", after each additive is added, stirring needs to be continued until it is completely uniform, and the total stirring duration does not exceed 120 minutes.

[0023] A kind of epoxy resin self-healing material with hybrid asphalt for the deck of long-span steel bridges and its preparation method according to the present invention includes the following by percentage: 40%-60% of epoxy resin matrix, 20%-40% of hybrid asphalt, 5%-15% of self-healing material and 5%-10% of additives. By introducing the self-healing material composed of the self-healing microcapsules or the self-healing fibers, when the material is damaged, the healing agent can be automatically released, restoring some mechanical properties, significantly reducing maintenance requirements, and extending the service life. And because the hybrid asphalt is preferably styrene-butadiene-styrene modified asphalt, the weather resistance, flexibility and high-temperature stability of traditional asphalt are improved. After being mixed with the epoxy resin matrix, the overall performance of the material can be significantly enhanced. By adopting the technical solution and introducing a self-healing mechanism, the material can automatically recover some mechanical properties after being damaged, significantly reducing maintenance requirements and extending the service life. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a flowchart of the steps of the preparation method of the epoxy resin self-healing material with hybrid asphalt for the deck of long-span steel bridges provided by the present invention.

[0026] Figure 2 It is a flowchart of the steps of the preparation method of the epoxy resin self-healing material with hybrid asphalt for the deck of long-span steel bridges in Embodiment 1 provided by the present invention.

[0027] Figure 3 It is a flowchart of the steps of the preparation method of the epoxy resin self-healing material with hybrid asphalt for the deck of long-span steel bridges in Embodiment 2 provided by the present invention.

[0028] Figure 4 It is a flowchart of the steps of the preparation method of the epoxy resin self-healing material with mixed asphalt for the deck of a long-span steel bridge in Embodiment 3 provided by the present invention. Detailed implementation manners

[0029] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] The present invention provides an epoxy resin self-healing material with mixed asphalt for the deck of a long-span steel bridge. The epoxy resin self-healing material with mixed asphalt for the deck of a long-span steel bridge includes the following by percentage: 40%-60% of an epoxy resin matrix, 20%-40% of mixed asphalt, 5%-15% of a self-healing material, and 5%-10% of an additive. The epoxy resin matrix is preferably bisphenol A epoxy resin. The mixed asphalt is preferably styrene-butadiene-styrene modified asphalt. The self-healing material is one of self-healing microcapsules or self-healing fibers. The additive includes a filler, a pigment, and a stabilizer.

[0031] In this embodiment, by introducing the self-healing material composed of the self-healing microcapsules or the self-healing fibers, when the material is damaged, it can automatically release the healing agent, restore some mechanical properties, significantly reduce the maintenance requirements, and extend the service life. And because the mixed asphalt is preferably styrene-butadiene-styrene modified asphalt, the weather resistance, flexibility, and high-temperature stability of traditional asphalt are improved. After being mixed with the epoxy resin matrix, the overall performance of the material can be significantly enhanced. By adopting this technical solution and introducing a self-healing mechanism, the material can automatically restore some mechanical properties after being damaged, significantly reduce the maintenance requirements, and extend the service life.

[0032] Further, when the self-healing material is self-healing microcapsules, the self-healing microcapsules are preferably made of a polyurethane prepolymer as the healing agent and a thermoplastic polymer as the outer shell (which can break and release the healing agent when a crack forms);

[0033] When the self-healing material is self-healing fibers, the self-healing fibers are fibers containing epoxy resin monomers (when the fibers break, the monomers are released and cured to achieve repair).

[0034] Further, the filler is preferably one or more of calcium carbonate and wollastonite (for improving the strength and durability of the material);

[0035] The stabilizer includes an antioxidant and an ultraviolet absorber (used to prevent chemical changes in the material during processing and use).

[0036] Please refer to Figure 1 , the present invention also provides a preparation method of an epoxy resin self-healing material with hybrid asphalt for the deck of a long-span steel bridge, which is used to prepare the epoxy resin self-healing material with hybrid asphalt for the deck of a long-span steel bridge as described above, and includes the following steps:

[0037] S1: Add styrene-butadiene-styrene polymer to the base asphalt for modification to obtain the hybrid asphalt;

[0038] S2: Add the obtained hybrid asphalt and the epoxy resin matrix into a reaction vessel, heat to 140°C - 160°C, and continuously stir during the heating process;

[0039] S3: Under the condition of maintaining stirring, slowly add the self-healing material so that the self-healing material is evenly mixed with the mixture of the hybrid asphalt and the epoxy resin matrix;

[0040] S4: Under the condition of maintaining stirring, gradually add the filler, the pigment, and the stabilizer so that the filler, the pigment, and the stabilizer are evenly mixed with the mixture in the reaction vessel to obtain a composite material;

[0041] S5: After cooling, curing, and surface treatment of the prepared composite material, obtain the epoxy resin self-healing material with hybrid asphalt for the deck of a long-span steel bridge.

[0042] Further, the specific steps of the step "Add styrene-butadiene-styrene polymer to the base asphalt for modification to obtain the hybrid asphalt" are as follows:

[0043] Add the styrene-butadiene-styrene polymer to the hot asphalt, and under the conditions of heating and stirring, make it fully dissolve to obtain a modifier solution;

[0044] Slowly add the modifier solution to the base asphalt, and under the conditions of heating and stirring, make the modifier fully react with the base asphalt and form a uniform mixture;

[0045] After the mixing reaction is completed, let the mixture stand at room temperature for 24 hours to obtain the hybrid asphalt.

[0046] Further, in the step "Add the obtained hybrid asphalt and the epoxy resin matrix into a reaction vessel, heat to 140°C - 160°C, and continuously stir during the heating process", the stirring speed is controlled at 50 - 100 revolutions per minute, and the stirring duration is 30 - 60 minutes.

[0047] Further, in the step of "under the condition of maintaining stirring, slowly add the self-healing material so that the self-healing material is uniformly mixed with the mixture of the mixed asphalt and the epoxy resin matrix", the stirring speed is controlled at 50-100 revolutions per minute, and the stirring duration is 60-90 minutes.

[0048] Further, in the step of "under the condition of maintaining stirring, gradually add the filler, the pigment and the stabilizer so that the filler, the pigment and the stabilizer are uniformly mixed with the mixture in the reaction vessel to obtain a composite material", after each additive is added, stirring needs to be continued until it is completely uniform, and the total stirring duration does not exceed 120 minutes.

[0049] In this embodiment, first, a styrene-butadiene-styrene polymer is added to the matrix asphalt for modification to obtain the mixed asphalt. Then, the obtained mixed asphalt and the epoxy resin matrix are added to a reaction vessel and heated to 140°C - 160°C. During the heating process, continuous stirring is carried out. Under the condition of maintaining stirring, the self-healing material is slowly added so that the self-healing material is uniformly mixed with the mixture of the mixed asphalt and the epoxy resin matrix. And under the condition of maintaining stirring, the filler, the pigment and the stabilizer are gradually added so that the filler, the pigment and the stabilizer are uniformly mixed with the mixture in the reaction vessel to obtain a composite material. Finally, the prepared composite material is cooled, cured and surface-treated to obtain the epoxy resin self-healing material with mixed asphalt for the deck of long-span steel bridges.

[0050] Example 1:

[0051] Please refer to Figure 2 , the present invention also provides a preparation method for an epoxy resin self-healing material with mixed asphalt for the deck of long-span steel bridges, which is used to prepare the epoxy resin self-healing material with mixed asphalt for the deck of long-span steel bridges as described above, and includes the following steps:

[0052] S101: Add a styrene-butadiene-styrene polymer to the matrix asphalt for modification to obtain the mixed asphalt;

[0053] S102: Add 20% of the mixed asphalt in the total amount of the epoxy resin self-healing material and 60% of the epoxy resin matrix in the total amount of the epoxy resin self-healing material to a reaction vessel, heat to 140°C, and under the stirring condition with a stirring speed of 50 revolutions per minute during the heating process, mix for 60 minutes;

[0054] S103: Under the stirring condition of maintaining the stirring speed at 50 revolutions per minute, slowly add the self-healing material accounting for 15% of the total amount of the epoxy resin self-healing material, and fully stir the self-healing material with the mixture of the mixed asphalt and the epoxy resin matrix for 90 minutes;

[0055] S104: Under the stirring condition of maintaining the stirring speed at 50 revolutions per minute, gradually add the filler, the pigment, and the stabilizer, so that the filler, the pigment, and the stabilizer are uniformly mixed with the mixture in the reaction vessel to obtain a composite material;

[0056] S105: After cooling, curing, and surface treatment of the prepared composite material, obtain the epoxy resin self-healing material with mixed asphalt for the large-span steel bridge deck.

[0057] Example 2:

[0058] Please refer to Figure 3 , the present invention also provides a preparation method of an epoxy resin self-healing material with mixed asphalt for a large-span steel bridge deck, which is used to prepare the epoxy resin self-healing material with mixed asphalt for a large-span steel bridge deck as described above, and includes the following steps:

[0059] S201: Add styrene-butadiene-styrene polymer to the matrix asphalt for modification to obtain the mixed asphalt;

[0060] S202: Add 40% of the mixed asphalt accounting for the total amount of the epoxy resin self-healing material and 40% of the epoxy resin matrix accounting for the total amount of the epoxy resin self-healing material to a reaction vessel, heat to 150 °C, and during the heating process, mix for 45 minutes under the stirring condition of a stirring speed of 75 revolutions per minute;

[0061] S203: Under the stirring condition of maintaining the stirring speed at 75 revolutions per minute, slowly add the self-healing material accounting for 15% of the total amount of the epoxy resin self-healing material, and fully stir the self-healing material with the mixture of the mixed asphalt and the epoxy resin matrix for 75 minutes;

[0062] S204: Under the stirring condition of maintaining the stirring speed at 75 revolutions per minute, gradually add the filler, the pigment, and the stabilizer, so that the filler, the pigment, and the stabilizer are uniformly mixed with the mixture in the reaction vessel to obtain a composite material;

[0063] S205: After cooling, curing, and surface treatment of the prepared composite material, obtain the epoxy resin self-healing material with mixed asphalt for the large-span steel bridge deck.

[0064] Example 3:

[0065] Please refer to Figure 4 , the present invention also provides a preparation method of an epoxy resin self-healing material with hybrid asphalt for a long-span steel bridge deck, which is used to prepare the epoxy resin self-healing material with hybrid asphalt for a long-span steel bridge deck as described above, and includes the following steps:

[0066] S301: Add styrene-butadiene-styrene polymer to the base asphalt for modification to obtain the hybrid asphalt;

[0067] S302: Add 30% of the hybrid asphalt in the total amount of the epoxy resin self-healing material and 55% of the epoxy resin matrix in the total amount of the epoxy resin self-healing material to a reaction vessel, heat to 160 °C, and during the heating process, mix for 30 minutes under the stirring condition with a stirring speed of 100 revolutions per minute;

[0068] S303: Under the stirring condition of maintaining a stirring speed of 100 revolutions per minute, slowly add 10% of the self-healing material in the total amount of the epoxy resin self-healing material, so that the self-healing material is fully stirred with the mixture of the hybrid asphalt and the epoxy resin matrix for 60 minutes;

[0069] S304: Under the stirring condition of maintaining a stirring speed of 100 revolutions per minute, gradually add the filler, the pigment and the stabilizer, so that the filler, the pigment and the stabilizer are uniformly mixed with the mixture in the reaction vessel to obtain a composite material;

[0070] S305: After cooling, curing and surface treatment of the prepared composite material, obtain the epoxy resin self-healing material with hybrid asphalt for a long-span steel bridge deck.

[0071] The above-disclosed is only a preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. An epoxy resin self-repairing material with mixed asphalt for long-span steel bridge decks, characterized in that: The composition comprises the following percentages: 40%-60% epoxy resin matrix, 20%-40% mixed asphalt, 5%-15% self-healing material and 5%-10% additives. The epoxy resin matrix is ​​preferably bisphenol A epoxy resin, the mixed asphalt is preferably styrene-butadiene-styrene modified asphalt, the self-healing material is one of self-healing microcapsules or self-healing fibers, and the additives include fillers, pigments and stabilizers.

2. The epoxy resin self-repairing material with mixed asphalt for long-span steel bridge deck according to claim 1, characterized in that: When the self-repairing material is a self-repairing microcapsule, the self-repairing microcapsule is preferably a material with a polyurethane prepolymer as a repairing agent and a shell of a thermoplastic polymer; When the self-repairing material is a self-repairing fiber, the self-repairing fiber is a fiber containing epoxy resin monomers.

3. The epoxy resin self-repairing material with mixed asphalt for long-span steel bridge deck according to claim 2, characterized in that: The filler is preferably one or more of calcium carbonate and wollastonite; The stabilizer includes an antioxidant and an ultraviolet absorber.

4. A method for preparing an epoxy resin self-repairing material with mixed asphalt for a long-span steel bridge deck, which is used to prepare the epoxy resin self-repairing material with mixed asphalt for a long-span steel bridge deck as claimed in claim 1, characterized in that: The steps include: Adding styrene-butadiene-styrene polymer to the base asphalt for modification to obtain the mixed asphalt; Add the obtained mixed asphalt and the epoxy resin matrix into a reaction container, heat to 140°C-160°C, and stir continuously during the heating process; While maintaining stirring, slowly adding the self-repairing material to make the self-repairing material and the mixture of the mixed asphalt and the epoxy resin matrix uniformly mixed; Under the condition of maintaining stirring, gradually adding the filler, the pigment and the stabilizer, so that the filler, the pigment and the stabilizer are uniformly mixed with the mixture in the reaction container to obtain a composite material; The prepared composite material is cooled, solidified and surface treated to obtain the epoxy resin self-repairing material with mixed asphalt for the bridge deck of a long-span steel bridge.

5. The method for preparing the epoxy resin self-repairing material with mixed asphalt for long-span steel bridge deck according to claim 4, characterized in that: The specific steps of the step of "adding styrene-butadiene-styrene polymer to the base asphalt for modification to obtain the mixed asphalt" are: Adding styrene-butadiene-styrene polymer into hot asphalt, and fully dissolving it under heating and stirring conditions to obtain a modifier solution; The modifier solution is slowly added to the base asphalt, and under heating and stirring conditions, the modifier and the base asphalt are fully reacted to form a uniform mixture; After the mixing reaction was completed, the mixture was allowed to stand at room temperature for 24 hours to obtain the mixed asphalt.

6. The method for preparing the epoxy resin self-repairing material with mixed asphalt for long-span steel bridge deck according to claim 5, characterized in that: In the step of "adding the obtained mixed asphalt and the epoxy resin matrix into a reaction container, heating to 140° C.-160° C., and continuously stirring during the heating process", the stirring speed is controlled at 50-100 rpm, and the stirring time is 30-60 minutes.

7. The method for preparing the epoxy resin self-repairing material with mixed asphalt for long-span steel bridge deck according to claim 6, characterized in that: In the step of "slowly adding the self-healing material while maintaining stirring so that the self-healing material and the mixture of the mixed asphalt and the epoxy resin matrix are evenly mixed", the stirring speed is controlled at 50-100 rpm and the stirring time is 60-90 minutes.

8. The method for preparing the epoxy resin self-repairing material with mixed asphalt for long-span steel bridge deck according to claim 7, characterized in that: In the step of "gradually adding the filler, the pigment and the stabilizer while maintaining stirring, so that the filler, the pigment and the stabilizer are uniformly mixed with the mixture in the reaction container to obtain a composite material", stirring must be continued until completely uniform after each additive is added, and the total stirring time shall not exceed 120 minutes.

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