Two-component overlay material suitable for modified asphalt concrete pavement and preparation method of two-component overlay material

Abstract

The invention relates to the field of overlay materials, in particular to a two-component overlay material suitable for a modified asphalt concrete pavement and a preparation method of the two-component overlay material. The two-component overlay material suitable for the modified asphalt concrete pavement comprises the following raw materials: a component A: a polymer emulsion, a composite additive, a silane coupling agent, a film-forming agent, an ultraviolet absorbent, a stabilizer and the like; the component B is a polyisocyanate curing agent. The finally prepared two-component overlay material can simultaneously give consideration to comprehensive properties such as adhesion, hydrolysis resistance, weather resistance and saline-alkaline resistance, the phenomenon that other properties are greatly sacrificed for a certain prominent property is avoided, and the overlay material can be ensured to be popularized and applied in various environments and harsh working conditions; the technical level of modified asphalt concrete pavement maintenance is greatly improved, and the application effect is excellent.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of surface covering materials, and more particularly to a two-component surface covering material suitable for modified asphalt concrete pavement and a preparation method thereof. BACKGROUND

[0002] In the field of current road engineering and infrastructure maintenance, modified asphalt concrete pavement, as a widely used road surface layer form, is prone to aging, cracking, erosion and surface function degradation during long-term use. In order to improve the durability and performance of modified asphalt concrete pavement, preventive maintenance or repair treatment is usually carried out by using surface covering materials. Two-component surface covering materials have attracted more attention in recent years because they can form a dense protective layer through chemical reaction. However, the existing two-component surface covering materials still have certain limitations in comprehensive performance, and it is difficult to fully meet the long-term protection requirements in complex environments.

[0003] The current common two-component surface covering materials mainly include epoxy, polyurethane and acrylate systems. Epoxy resin materials have high hardness and good adhesion, but their weather resistance and ultraviolet resistance are poor, and they are prone to yellowing and powdering after long-term outdoor exposure, which seriously affects the appearance and use effect. Polyurethane materials have good flexibility and excellent wear resistance, but they are prone to hydrolysis in hot and humid or acidic and alkaline environments, resulting in coating softening and peeling, especially in coastal or deicing salt areas. Acrylate materials have excellent weather resistance, but they generally have low hardness and insufficient mechanical strength, making it difficult to withstand long-term loads of heavy traffic. In addition, most of the above materials have a narrow construction window, i.e. short open time, which is not conducive to large-scale construction operations and is prone to poor film formation or adhesion failure due to delayed operation.

[0004] On the other hand, existing surface covering materials often perform poorly in salt and alkali resistance. Especially in cold northern regions where deicing salt is frequently used for deicing, or in coastal areas where seawater salt spray is eroded, conventional materials are prone to blistering, peeling and performance degradation. In addition, most high-performance surface covering materials require high precision in construction foundation surface treatment and ratio, and it is difficult to achieve the designed performance if the on-site construction conditions are limited. SUMMARY

[0005] In summary, although the prior art has provided several types of two-component coating materials, which have outstanding performance in one or several performance indicators, but still lack of a comprehensive type of coating material which can simultaneously have high hardness, strong adhesion, good hydrolysis resistance, good weather resistance, longer open time and excellent salt and alkali resistance. This technical gap seriously limits the popularization and application of such materials in various environments and harsh working conditions, and also restricts the further improvement of the maintenance technology level of modified asphalt concrete pavement. Through in-depth research in this field, the present inventors finally propose a two-component coating material for modified asphalt concrete pavement and a preparation method thereof in the present application to further solve the above problems.

[0006] A two-component coating material for modified asphalt concrete pavement, by mass fraction, the raw materials include: A component: polymer emulsion 70-90 parts, composite additive 3-8 parts, silane coupling agent 0.5-1.2 parts, film forming agent 2-3.5 parts, ultraviolet absorber 0.3-0.6 parts, stabilizer 0.3-0.6 parts, thickening agent 0.5-1.5 parts, polymerization aid 5-10 parts, defoaming agent 0.3-0.6 parts, color paste 2-8 parts, deionized water 5-15 parts; B component: polyisocyanate curing agent 8-15 parts.

[0007] Preferably, the polymer emulsion is a combination of anionic aromatic polyurethane emulsion and hydroxy acrylate emulsion.

[0008] Preferably, the mass ratio of the anionic aromatic polyurethane emulsion and the hydroxy acrylate emulsion is (4-5):(3-4).

[0009] More preferably, the mass ratio of the anionic aromatic polyurethane emulsion and the hydroxy acrylate emulsion is (4-4.5):(3-3.5).

[0010] Most preferably, the mass ratio of the anionic aromatic polyurethane emulsion and the hydroxy acrylate emulsion is 4.5:3.

[0011] Preferably, the mass ratio of the polymer emulsion, the composite additive and the polymerization aid is (7.5-8.5):(0.5-0.8):(0.7-1).

[0012] More preferably, the mass ratio of the polymer emulsion, the composite additive and the polymerization aid is 8:0.6:0.9.

[0013] Preferably, the composite additive is a combination of hyperbranched polyester and epoxy functionalized polysiloxane.

[0014] Preferably, the mass ratio of the hyperbranched polyester and the epoxy functionalized polysiloxane is (2-3):(0.8-1).

[0015] More preferably, the mass ratio of the hyperbranched polyester and the epoxy-functionalized polysiloxane is 2.5:1.

[0016] Preferably, the hyperbranched polyester is hydroxyl-terminated hyperbranched polyester Boltorn H20 from Perstorp, Sweden.

[0017] Preferably, the epoxy-functionalized polysiloxane is A-1871 from Momentive, USA.

[0018] The composite additive added in the present application significantly improves the comprehensive performance of the overcoat material through the joint action with the compounded polymer emulsion, especially in the simultaneous realization of high hardness, strong adhesion and excellent durability and weather resistance. The two components form a complementary reinforcement mechanism during the curing process, and the hyperbranched polyester efficiently crosslinks to greatly improve the crosslinking density and rigid skeleton of the coating; in addition, the epoxy-functionalized polysiloxane tends to enhance the interface region between the coating and the asphalt, enhancing the interconnection strength at the interface, improving the adhesion, maintaining the functional segments within the system, ensuring the hydrophobicity and flexibility, effectively blocking the invasion of corrosive media such as water and salt, and relieving internal stress, thereby jointly contributing to the excellent hydrolysis resistance, salt and alkali resistance and long-term weather resistance of the coating, enabling it to resist the aging effects of complex environments for a long time.

[0019] Preferably, the silane coupling agent is any one of the reactive silane coupling agents.

[0020] Preferably, the film-forming agent is at least one of alcohol ester twelve, dipropylene glycol butyl ether, propylene glycol phenyl ether and diethylene glycol butyl ether.

[0021] More preferably, the film-forming agent is alcohol ester twelve or dipropylene glycol butyl ether.

[0022] Most preferably, the film-forming agent is alcohol ester twelve.

[0023] Preferably, the ultraviolet absorber is at least one of benzotriazoles, triazines and cyanoacrylate.

[0024] More preferably, the ultraviolet absorber is benzotriazoles or triazines.

[0025] Preferably, the stabilizer is at least one of Tinuvin 292, Tinuvin 326, Tinuvin 328, Eversorb 90 and T-292.

[0026] More preferably, the stabilizer is Tinuvin 292 or Eversorb 90.

[0027] Most preferably, the stabilizer is Tinuvin 292.

[0028] Preferably, the thickening agent is at least one of polyurethane, cellulose ether, polyvinylpyrrolidone, acrylic and polyether.

[0029] More preferably, the thickening agent is cellulose ether or polyurethane.

[0030] Most preferably, the thickening agent is polyurethane.

[0031] Preferably, the polymerization aid is a combination of modified acrylic ester and aqueous modified polyurethane dispersion.

[0032] Preferably, the mass ratio of the modified acrylic ester and the aqueous modified polyurethane dispersion is (0.5-0.8):(1-2).

[0033] More preferably, the mass ratio of the modified acrylic ester and the aqueous modified polyurethane dispersion is 0.6:1.5.

[0034] More preferably, the modified acrylic ester is EBECRYL 81 from Evonik, Germany.

[0035] More preferably, the aqueous modified polyurethane dispersion is Bayhydrol UH 2600 from Covestro, Germany.

[0036] Through the addition of the polymerization aid, the complementary effect of the two provides a key durability guarantee for the core coating system. After curing, the two components form a common protective effect, forming a layer of efficient protection on the surface of the coating, resisting ultraviolet rays for a long time, and through the inherent stable chemical structure of the aqueous modified polyurethane dispersion, the anti-degradation ability of the coating body is enhanced, which can effectively resist the penetration and erosion of moisture and saline medium, ensuring the long-term integrity of the coating in harsh environments. And finally, the two polymers are combined organically to build a stable and dense barrier inside the material. This barrier not only resists weathering, but also resists the damage of various corrosion factors for a long time, thereby significantly improving the service life and protection effect of the coating material, achieving long-term protection of the modified asphalt concrete pavement.

[0037] Preferably, the defoaming agent is at least one of polyether-modified polysiloxane, mineral oil and fatty alcohol.

[0038] More preferably, the defoaming agent is polyether-modified polysiloxane.

[0039] Preferably, the polyisocyanate curing agent is an aliphatic polyisocyanate curing agent.

[0040] Preferably, the polyisocyanate curing agent is aliphatic polyisocyanate Desmodur® N 3900 from Covestro, Germany.

[0041] A preparation method of a two-component cover material suitable for modified asphalt concrete pavement, comprising the following steps: S1: adding deionized water into a reaction cylinder, adjusting the rotating speed, then adding a silane coupling agent, an ultraviolet absorber and a stabilizer, then adding a polymer emulsion and a polymerization aid into the reaction cylinder, and adjusting the rotating speed until the overall emulsion is uniformly dispersed; S2: adding a film former and dispersing for 20-25 min until no oil shrinkage occurs, then adding the remaining raw materials of the A component, uniformly dispersing for 10-15 min at a rotating speed of 700-800 rpm until the viscosity is stable, and uniformly mixing to obtain the A component; S3: directly sealing and packaging a polyisocyanate curing agent under a low-temperature and low-humidity environment to obtain the B component, and adding the B component after fully stirring the A component before construction, and stirring for 3-5 min at 500-600 rpm until the slurry is uniform and free of any dry powder particles.

[0042] Preferably, the preparation method of the two-component cover material suitable for modified asphalt concrete pavement comprises the following steps: S1: adding deionized water into a reaction cylinder, adjusting the rotating speed to 200-300 rpm, then adding a silane coupling agent, an ultraviolet absorber and a stabilizer, then adding a polymer emulsion and a polymerization aid into the reaction cylinder, and adjusting the rotating speed to 500-600 rpm until the overall emulsion is uniformly dispersed; S2: adding a film former and dispersing for 20-25 min until no oil shrinkage occurs, then adding the remaining raw materials of the A component, adjusting the rotating speed to 700-800 rpm and dispersing for 10-15 min until the viscosity is stable, and uniformly mixing to obtain the A component; S3: directly sealing and packaging a polyisocyanate curing agent under a low-temperature and low-humidity environment of 15-20°C and 30-50% environmental humidity to obtain the B component, and adding the B component after fully stirring the A component before construction, and stirring for 3-5 min at 500-600 rpm until the slurry is uniform and free of any dry powder particles.

[0043] The beneficial effects of the present application are as follows: 1. The two-component cover material prepared by the present application can simultaneously consider the comprehensive performance of adhesion, hydrolysis resistance, weather resistance and salt and alkali resistance, avoiding the phenomenon of greatly sacrificing other performances for a certain outstanding performance, and ensuring the popularization and application of such cover materials in various environments and harsh working conditions, greatly improving the technical level of modified asphalt concrete pavement maintenance, and having excellent application effect.

[0044] 2. The composite additive added in the present application significantly improves the comprehensive performance of the cover material through the joint action with the compounded polymer emulsion, especially in simultaneously achieving high hardness, strong adhesion and excellent durability and weather resistance.

[0045] 3、The application further provides durability protection for the core coating system through the addition of a polymerization aid. The two components form a combined protective effect after curing, forming a layer of efficient protection on the surface of the coating that resists ultraviolet rays. The inherent stable chemical structure of the water-based modified polyurethane dispersion enhances the anti-degradation ability of the coating body, effectively resisting the penetration and erosion of moisture and saline media, and ensuring the long-term integrity of the coating in harsh environments. DETAILED DESCRIPTION

[0046] Example 1 A two-component coating material suitable for modified asphalt concrete pavement, by mass fraction, the raw materials include: component A: polymer emulsion 80 parts, composite additive 6 parts, silane coupling agent 1.1 parts, film forming agent 2.8 parts, ultraviolet absorber 0.4 parts, stabilizer 0.5 parts, thickening agent 1.2 parts, polymerization aid 9 parts, defoaming agent 0.4 parts, color paste 6 parts, deionized water 12 parts; component B: polyisocyanate curing agent 10 parts.

[0047] The polymer emulsion is a combination of anionic aromatic polyurethane emulsion and hydroxy acrylate emulsion, with a mass ratio of 4.5:3.

[0048] The anionic aromatic polyurethane emulsion is PUD831 from Guangzhou Tailai New Material Technology Co., Ltd. in China, and the hydroxy acrylate emulsion is 6030 from Foshan Tiancheng Environmental Protection Material Co., Ltd.

[0049] The color paste is green color paste G7007 from Yingde Kedie Pigment Technology Co., Ltd.

[0050] The composite additive is a combination of hyperbranched polyester and epoxy functionalized polysiloxane, with a mass ratio of 2.5:1. The hyperbranched polyester is Boltorn H20 from Perstorp in Sweden, and the epoxy functionalized polysiloxane is A-1871 from Momentive in the United States.

[0051] The silane coupling agent is reactive silane coupling agent γ-glycidoxypropyltrimethoxysilane.

[0052] The film forming agent is alcohol ester twelve; the ultraviolet absorber is benzotriazole Tinuvin 1130; the stabilizer is Tinuvin 292; the thickening agent is polyurethane PU-40 from Enze Chemical in Qingdao, China; and the defoaming agent is polyether modified polysiloxane BYK-024.

[0053] The polymerization aid is a combination of modified acrylate and aqueous modified polyurethane dispersion, mass ratio 0.6:1.5. The modified acrylate is EBECRYL 81 from Evonik, Germany; the aqueous modified polyurethane dispersion is Bayhydrol® UH2606 from Covestro, Germany.

[0054] The polyisocyanate curing agent is aliphatic polyisocyanate Desmodur® N 3900 from Covestro, Germany.

[0055] A preparation method of a two-component cover material suitable for modified asphalt concrete pavement, specifically comprising the following steps: S1: adding deionized water into a reaction cylinder, adjusting the rotation speed to 250 rpm, then adding a silane coupling agent, an ultraviolet absorber and a stabilizer, and then adding a polymer emulsion and a polymerization aid into the reaction cylinder, adjusting the rotation speed to 550 rpm until the overall emulsion is uniformly dispersed; S2: adding a film former and dispersing for 22 min until no oil shrinkage occurs, and then adding the remaining raw materials of component A, adjusting the rotation speed to 800 rpm and dispersing for 12 min until the viscosity is stable, and mixing uniformly to obtain component A; S3: directly sealing and packaging the polyisocyanate curing agent at 20°C and 40% environmental humidity to obtain component B, and before construction, fully stirring component A and then adding component B, stirring at 600 rpm for 4 min until the slurry is uniform and free of any dry powder particles.

[0056] Example 2 A two-component cover material suitable for modified asphalt concrete pavement, by mass parts, the raw materials include: component A: polymer emulsion 85 parts, composite additive 7 parts, silane coupling agent 1.1 parts, film former 2.8 parts, ultraviolet absorber 0.4 parts, stabilizer 0.5 parts, thickening agent 1.2 parts, polymerization aid 7 parts, defoaming agent 0.4 parts, color paste 6 parts, deionized water 12 parts; component B: polyisocyanate curing agent 10 parts.

[0057] The polymer emulsion is a combination of anionic aromatic polyurethane emulsion and hydroxy acrylate emulsion, mass ratio 4:3.5.

[0058] The anionic aromatic polyurethane emulsion is PUD831 from Guangzhou Tailai New Material Technology Co., Ltd., China; the hydroxy acrylate emulsion is 6030 from Foshan Tiancheng Environmental Protection Material Co., Ltd.

[0059] The color paste is green color paste G7007 from Yingde Kedi Pigment Technology Co., Ltd.

[0060] The composite additive is a combination of hyperbranched polyester and epoxy functionalized polysiloxane with a mass ratio of 3:1. The hyperbranched polyester is hydroxyl-terminated hyperbranched polyester Boltorn H20 from Perstorp, Sweden; and the epoxy functionalized polysiloxane is A-1871 from Momentive, USA.

[0061] The silane coupling agent is a reactive silane coupling agent γ-glycidoxypropyltrimethoxysilane.

[0062] The film-forming agent is alcohol ester twelve; the ultraviolet absorber is benzotriazole Tinuvin 1130; the stabilizer is Tinuvin 292; the thickening agent is polyurethane PU-40 from Enze Chemical, Qingdao, China; and the defoaming agent is polyether modified polysiloxane BYK-024.

[0063] The polymerization aid is a combination of modified acrylate and water-based modified polyurethane dispersion with a mass ratio of 0.8:1.7. The modified acrylate is EBECRYL 81 from Evonik, Germany; and the water-based modified polyurethane dispersion is Bayhydrol® UH2606 from Covestro, Germany.

[0064] The polyisocyanate curing agent is aliphatic polyisocyanate Desmodur® N 3900 from Covestro, Germany.

[0065] A preparation method of a two-component overlay material suitable for modified asphalt concrete pavement, specifically comprising the following steps: S1: adding deionized water into a reaction cylinder, adjusting the rotation speed to 250 rpm, then adding a silane coupling agent, an ultraviolet absorber and a stabilizer, and then adding a polymer emulsion and a polymerization aid into the reaction cylinder, adjusting the rotation speed to 550 rpm until the overall emulsion is uniformly dispersed; S2: adding a film-forming agent and dispersing for 22 min until no oil shrinkage occurs, and then adding the remaining raw materials of component A, adjusting the rotation speed to 800 rpm and dispersing for 12 min until the viscosity is stable, and then uniformly mixing to obtain component A; S3: directly sealing and packaging the polyisocyanate curing agent at 20°C and 40% environmental humidity to obtain component B, and before construction, fully stirring component A and then adding component B, stirring at 600 rpm for 4 min until the slurry is uniform and free of any dry powder particles.

[0066] Example 3 A two-component overlay material suitable for modified asphalt concrete pavement, by mass parts, the raw materials include: component A: polymer emulsion 75 parts, composite additive 7.5 parts, silane coupling agent 1.1 part, film-forming agent 2.8 parts, ultraviolet absorber 0.4 part, stabilizer 0.5 part, thickening agent 1.2 part, polymerization aid 8.5 parts, defoaming agent 0.4 part, color paste 6 parts, deionized water 12 parts; component B: polyisocyanate curing agent 10 parts.

[0067] The polymer emulsion is a combination of anionic aromatic polyurethane emulsion and hydroxyl acrylate emulsion with a mass ratio of 4.5:3.5.

[0068] The anionic aromatic polyurethane emulsion is PUD831 from Guangzhou Tailai New Material Technology Co., Ltd. in China; the hydroxyl acrylate emulsion is 6030 from Foshan Tiancheng Environmental Protection Material Co., Ltd.

[0069] The color paste is green color paste G7007 from Yingde Kodisoft Pigment Technology Co., Ltd.

[0070] The composite additive is a combination of hyperbranched polyester and epoxy-functionalized polysiloxane with a mass ratio of 3:0.8. The hyperbranched polyester is hydroxyl-terminated hyperbranched polyester Boltorn H20 from Perstorp in Sweden; the epoxy-functionalized polysiloxane is A-1871 from Momentive in the United States.

[0071] The silane coupling agent is reactive silane coupling agent γ-glycidoxypropyltrimethoxysilane.

[0072] The film-forming agent is alcohol ester twelve; the ultraviolet absorber is benzotriazole Tinuvin 1130; the stabilizer is Tinuvin 292; the thickening agent is polyurethane PU-40 from Enze Chemical in Qingdao, China; and the defoaming agent is polyether-modified polysiloxane BYK-024.

[0073] The polymerization aid is a combination of modified acrylate and water-based modified polyurethane dispersion with a mass ratio of 0.8:2. The modified acrylate is EBECRYL 81 from Evonik in Germany; and the water-based modified polyurethane dispersion is Bayhydrol® UH 2606 from Covestro in Germany.

[0074] The polyisocyanate curing agent is aliphatic polyisocyanate Desmodur® N 3900 from Covestro in Germany.

[0075] A preparation method of a two-component cover material suitable for a modified asphalt concrete pavement, specifically comprising the following steps: S1: adding deionized water into a reaction cylinder, adjusting the rotation speed to 250 rpm, then adding a silane coupling agent, an ultraviolet absorber and a stabilizer, and then adding a polymer emulsion and a polymerization aid into the reaction cylinder, adjusting the rotation speed to 550 rpm until the overall emulsion is uniformly dispersed; S2: adding a film forming agent and dispersing for 22 min until no oil shrinkage occurs, and then adding the remaining raw materials of the A component, adjusting the rotation speed to 800 rpm and dispersing for 12 min until the viscosity is stable and the mixture is uniform, to obtain the A component; S3: directly sealing and packaging the polyisocyanate curing agent at 20 DEG C and 40% environmental humidity to obtain the B component, and before construction, fully stirring the A component and then adding the B component, stirring at 600 rpm for 4 min until the slurry is uniform and free of any dry powder particles, to obtain the product.

[0076] Comparative Example 1 The present comparative example is different from Example 1 only in that: a two-component cover material suitable for a modified asphalt concrete pavement, by mass parts, the raw materials include: A component: polymer emulsion 90 parts, composite additive 1.5 parts, silane coupling agent 1.1 parts, film forming agent 2.8 parts, ultraviolet absorber 0.4 parts, stabilizer 0.5 parts, thickening agent 1.2 parts, polymerization aid 12 parts, defoaming agent 0.4 parts, color paste 6 parts, deionized water 12 parts; B component: polyisocyanate curing agent 10 parts.

[0077] The remaining embodiments are the same.

[0078] Comparative Example 2 The present comparative example is different from Example 1 only in that: a two-component cover material suitable for a modified asphalt concrete pavement, by mass parts, the raw materials include: A component: polymer emulsion 80 parts, composite additive 9 parts, silane coupling agent 1.1 parts, film forming agent 2.8 parts, ultraviolet absorber 0.4 parts, stabilizer 0.5 parts, thickening agent 1.2 parts, polymerization aid 2 parts, defoaming agent 0.4 parts, color paste 6 parts, deionized water 12 parts; B component: polyisocyanate curing agent 10 parts.

[0079] The remaining embodiments are the same.

[0080] Comparative Example 3 The present comparative example is different from Example 1 only in that: the polymer emulsion is a combination of anionic aromatic polyurethane emulsion and hydroxy acrylate emulsion, with a mass ratio of 5:1.

[0081] The remaining embodiments are the same.

[0082] Comparative Example 4 The present comparative example is different from Example 1 only in that: the composite additive is a combination of hyperbranched polyester and epoxy functionalized polysiloxane, with a mass ratio of 4:0.5.

[0083] The rest of the embodiments are the same.

[0084] Comparative Example 5 This comparative example is different from Example 1 only in that the polymerization aid is a combination of modified acrylate and aqueous modified polyurethane dispersion, with a mass ratio of 0.2:1.8.

[0085] The rest of the embodiments are the same.

[0086] Comparative Example 6 This comparative example is different from Example 1 only in that the polymerization aid is a combination of modified acrylate and aqueous modified polyurethane dispersion, with a mass ratio of 1:0.5.

[0087] The rest of the embodiments are the same.

[0088] Performance Test 1. Adhesion: Test according to the reference standard GB / T 5210-2006, prepare standard asphalt concrete plates, clean and dry the prepared coating material, and maintain under standard conditions (23±2°C, 50±5% RH) for 7 days. High-strength adhesive is vertically bonded to the surface of the cured coating, and after the adhesive is completely cured, a uniform vertical pulling force is applied using an instrument until the coating is pulled off. The maximum pulling force value is recorded, and the average of 10 test results is recorded in Table 1.

[0089] 2. Hydrolysis resistance: Test according to the reference standard GB / T 1733-1993, prepare standard plates, maintain under standard conditions (23±2°C, 50±5% RH) for 7 days, and then immerse the plates in deionized water at a temperature of 40-42°C. After 240h of continuous immersion, remove the plates, absorb the water with filter paper, and immediately observe whether there are bubbles, loss of luster, discoloration, or peeling on the surface of the paint film. If there are, it is recorded as unqualified, otherwise it is qualified. There are 50 plates in each group, and the qualified rate result is recorded in Table 1.

[0090] 3. Aging resistance: Test according to the reference standard GB / T 1865-2009, prepare standard plates, maintain under standard conditions (23±2°C, 50±5% RH) for 7 days, then illuminate (0.55 W / m² @ 340nm), blackboard temperature 60-63°C, spray, run for 2000h, then remove the plates, calculate the loss of luster before and after the test, and the average of 10 test results is recorded in Table 1.

[0091] 4. Corrosion resistance: The prepared sample was maintained under standard conditions (23±2°C, 50±5% RH) for 7 days, then immersed in a 5wt% sodium chloride solution, and soaked at room temperature for 168h. After soaking, the film state was observed. If the film was complete, without blistering, rusting, peeling, or sticking, it was considered qualified. If any of the above phenomena occurred, it was considered unqualified. Each group was tested in parallel for 50 groups, and the final pass rate was recorded in Table 1.

[0092] 5. Hardness: The material was tested according to GB / T 6739-2022, and was applied to a glass plate with a wet film thickness of about 500μm. After maintaining under standard conditions for 7 days, a set of known hardness pencils (from 6B to 9H) were used. The pencil tip was ground flat and placed in a special pencil hardness tester. The pencil was pushed across the film surface at a speed of about 1mm / s for a length of about 6.5mm. The pencil with the hardest grade that did not scratch the film was selected, and the result was recorded in Table 1.

[0093] Table 1 Performance test results Adhesion (MPa) Hydrolysis resistance - Pass rate (%) Aging resistance - Loss of gloss (%) Corrosion resistance - Pass rate (%) Hardness Example 1 Example 2 2.62 98 12.3 94 5H Example 3 2.57 94 12.7 92 5H Comparative Example 1 2.60 98 11.8 94 5H Comparative Example 2 2.31 84 20.1 86 4H Comparative Example 3 2.27 82 17.6 90 4H Comparative Example 4 2.44 90 18.2 92 5H Comparative Example 5 2.37 92 16.3 84 4H Comparative Example 6 2.39 88 16.8 88 5H ​ 2.28 92 15.9 90 4H As shown by the test results in the final Table 1, Examples 1-3 used the relevant technical solutions defined in the present application, which formed a common protective effect after curing, forming a layer of efficient protection on the surface of the coating to resist ultraviolet light. The inherent stable chemical structure of the water-based modified polyurethane dispersion enhanced the anti-degradation ability of the coating body, effectively resisting the penetration and erosion of moisture and saline media, ensuring the long-term integrity of the coating in harsh environments, and thus achieving excellent comprehensive performance.

[0094] Comparative Examples 1 and 2 did not use the appropriate polymer emulsion, composite additive, and polymerization aid ratio scheme defined in the present application, resulting in a significant decrease in the corresponding combined effect in the system, which in turn led to a significant decrease in the performance of the final coating material. Comparative Examples 3-6 did not use the ranges and selections defined in the present application for the selection and ratio scheme of polymerization aids, polymer emulsions, and composite additives, which in turn caused a significant deviation in their corresponding effects, and thus a decrease in performance.

Claims

1. A two-component overlay material suitable for use in modifying asphalt concrete pavements, characterized by: The raw materials include, in mass parts: A component: 70-90 parts of a polymer emulsion, 3-8 parts of a composite additive, 0.5-1.2 parts of a silane coupling agent, 2-3.5 parts of a film forming agent, 0.3-0.6 parts of an ultraviolet absorber, 0.3-0.6 parts of a stabilizer, 0.5-1.5 parts of a thickening agent, 5-10 parts of a polymerization aid, 0.3-0.6 parts of an antifoaming agent, 2-8 parts of a color paste, and 5-15 parts of deionized water; and B component: 8-15 parts of a polyisocyanate curing agent; The polymer emulsion is a combination of an anionic aromatic polyurethane emulsion and a hydroxyl acrylate emulsion, with a mass ratio of (4-5):(3-4); The composite additive is a combination of hyperbranched polyester and epoxy functionalized polysiloxane, with a mass ratio of (2-3):(0.8-1).

2. The two-component overlay material suitable for use in a modified bituminous concrete pavement of claim 1, wherein: The mass ratio of the polymer emulsion, the composite additive, and the polymerization aid is (7.5-8.5):(0.5-0.8):(0.7-1).

3. The two-component overlay material suitable for use in a modified bituminous concrete pavement of claim 1, wherein: The hyperbranched polyester is hydroxyl-terminated hyperbranched polyester Boltorn H20, and the epoxy functionalized polysiloxane is A-1871.

4. The two-component overlay material suitable for use in a modified bituminous concrete pavement of claim 1, wherein: The film forming agent is at least one of alcohol ester dodecane, dipropylene glycol butyl ether, propylene glycol phenyl ether, and diethylene glycol butyl ether.

5. The two-component overlay material suitable for use in a modified bituminous concrete pavement of claim 1, wherein: The ultraviolet absorber is at least one of benzotriazole, triazine, and cyanoacrylate.

6. The two-component overlay material suitable for use in a modified bituminous concrete pavement of claim 1, wherein: The thickening agent is at least one of polyurethane, cellulose ether, polyvinylpyrrolidone, acrylic acid, and polyether.

7. The two-component overlay material suitable for use in the modification of asphalt concrete pavements according to claim 1, characterized in that: The polymerization aid is a combination of modified acrylate and water-based modified polyurethane dispersion, with a mass ratio of (0.5-0.8):(1-2).

8. The two-component overlay material suitable for use in a modified bituminous concrete pavement of claim 1, wherein: The antifoaming agent is at least one of polyether modified polysiloxane, mineral oil, and fatty alcohol.

9. The two-component overlay material suitable for use in the modification of asphalt concrete pavements according to claim 1, characterized in that: The polyisocyanate curing agent is an aliphatic polyisocyanate curing agent.

10. A method for preparing a two-component overlay material for use in modifying asphalt concrete pavements according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: deionized water is added to a reaction cylinder, and after adjusting the rotation speed, the silane coupling agent, the ultraviolet absorber, and the stabilizer are added, then the polymer emulsion and the polymerization aid are added to the reaction cylinder, and the rotation speed is adjusted until the overall emulsion is uniformly dispersed; S2: the film forming agent is added and dispersed until it is not oily, then the remaining raw materials of the A component are added, uniformly dispersed until the viscosity is stable, and mixed uniformly to obtain the A component; S3: the polyisocyanate curing agent is directly sealed and packaged in a low-temperature and low-humidity environment to obtain the B component, and before construction, the A component is fully stirred and then added to the B component, and stirred until the slurry is uniform and free of any dry powder particles.