Exposed modified asphalt waterproof coating as well as preparation method and application thereof

Abstract

The invention discloses an exposed modified asphalt waterproof coating and a preparation method and application thereof. The coating comprises a base material composed of SBS modified asphalt emulsion, acrylate polymer emulsion and bio-based toughened resin, and a slow-release anti-aging agent (core-shell structure microcapsules, an anti-aging agent and an anti-aging agent), an inner core is a hindered amine light stabilizer and a benzotriazole ultraviolet light absorber), a temperature control functional material (a microencapsulation phase change material), a color stabilizer, a nano functional material (graphene-loaded TiO2 and nano SiO2), a filler, a defoaming agent, an anionic wetting agent and a thickening agent. The preparation method comprises the steps of base material mixing, toughening modification, nanometer grinding, functional material dispersion, auxiliary agent compounding, curing and the like. Through a slow-release anti-aging technology, a phase-change temperature adjustment function and a nano-reinforcement synergistic effect, the coating has excellent weather resistance, temperature adaptability and mechanical properties, is suitable for waterproof projects such as building roofs and basements, and is particularly suitable for exposed waterproof projects with more waterproof nodes.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof coating preparation, and in particular to an exposed modified asphalt waterproof coating and a preparation method and application thereof. Background Art

[0002] With the continuous development of building waterproofing technology, exposed waterproof coatings have gained widespread application in building waterproofing projects due to their ease of application and adaptability. Traditional modified asphalt waterproof coatings, typically based on emulsified asphalt and polymer emulsions, offer excellent waterproofing, corrosion resistance, moisture resistance, and mildew resistance. However, long-term exposure to ultraviolet light, temperature fluctuations, and the external environment can lead to aging, cracking, and fading, compromising both waterproofing effectiveness and aesthetics.

[0003] In existing technologies, light stabilizers or UV absorbers are often added directly to improve the aging resistance of coatings. However, these additives are prone to migration, volatilization, or photolysis, making it difficult to maintain long-term protective effects. Furthermore, traditional coatings have poor temperature adaptability, exacerbating thermal oxidation in high-temperature environments and degrading mechanical properties, which in turn leads to a decrease in the protective performance of the coating. While some studies have attempted to incorporate phase change materials to regulate temperature changes, conventional phase change materials are prone to leakage and have poor compatibility with the asphalt matrix, affecting the stability of the coating.

[0004] In terms of color retention, traditional exposed asphalt coatings often use carbon black for coloring, but this can easily lead to fading and chalking after long-term exposure. While some research has used metal oxides or organic pigments to improve color stability, the complex asphalt system can easily lead to pigment aggregation or sedimentation, resulting in uneven coating color. Furthermore, while the addition of conventional fillers can enhance the tensile strength of the coating, excessive amounts can reduce the coating's flexibility and adhesion.

[0005] Therefore, in response to the above problems, the present invention provides an exposed modified asphalt waterproof coating, a preparation method and an application thereof. The exposed modified asphalt waterproof coating of the present invention improves the weather resistance, temperature adaptability, color stability and mechanical properties of the waterproof coating through the synergy of components such as slow-release anti-aging agents, microencapsulated phase change materials, nano-functional materials and surface-modified fillers. Summary of the Invention

[0006] The purpose of the present invention is to provide an exposed modified asphalt waterproof coating and its preparation method and application, so as to improve the weather resistance, temperature adaptability, color stability and mechanical properties of the waterproof coating.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] An exposed modified asphalt waterproof coating, comprising the following components in parts by weight:

[0009] 48-75 parts of base material; 0.1-2 parts of slow-release anti-aging agent; 5-15 parts of temperature control functional material; 0.5-3 parts of color stabilizer; 3-8 parts of nano functional material; 20-50 parts of filler; 0.5-2 parts of defoaming agent; 1-3 parts of anionic wetting agent; 0.5-2 parts of thickener;

[0010] Wherein, the base material comprises 35-52 parts of SBS modified asphalt emulsion and 10-15 parts of acrylic polymer emulsion;

[0011] The slow-release anti-aging agent is a core-shell structure microcapsule, the core of which is composed of a hindered amine light stabilizer and a benzotriazole ultraviolet absorber in a mass ratio of 3 to 5:1, and the shell is polymethylsilsesquioxane; the hindered amine light stabilizer is selected from one of LS111 and UV4050, and the benzotriazole ultraviolet absorber is selected from one of UV928 and UV234;

[0012] The temperature control functional material is a microencapsulated phase change material with a melting point of 60 to 80° C., selected from a polyurethane / sodium sulfate composite material, a paraffin / expanded graphite composite material, or an organic paraffin;

[0013] The color stabilizer is a metal oxide or phthalocyanine pigment surface-treated with a silane coupling agent;

[0014] The nano-functional material comprises 2 to 5 parts of graphene-loaded anatase TiO2 and 1 to 3 parts of nano-silicon dioxide, wherein the TiO2 is bonded to the graphene surface via a CO-Ti bond;

[0015] The filler is selected from one or more of silicon dioxide, aluminum hydroxide, talc, and calcium carbonate, and at least 20% of the filler is nano-scale filler treated with a silane coupling agent.

[0016] Preferably, the color stabilizer is selected from iron oxide red, iron oxide blue or phthalocyanine blue surface-treated with a silane coupling agent, and the silane coupling agent in the color stabilizer is selected from aminosilane (KH-550) or epoxysilane (KH-560) to improve compatibility and dispersibility with the asphalt system.

[0017] Preferably, the silane coupling agent in the nanoscale filler treated with a silane coupling agent is selected from methacryloxysilane (KH-570) or mercaptosilane (KH-590), which enhances the interfacial bonding force and prevents agglomeration.

[0018] Preferably, the particle size of the microcapsules of the sustained-release anti-aging agent is 1 to 1000 μm, and the shell thickness is 100 to 800 nm;

[0019] The number of graphene layers is ≤5, and the supported TiO2 particle size is 20-50nm;

[0020] The temperature control functional material is a paraffin / expanded graphite composite material, and the porosity of the expanded graphite is 85% to 95%.

[0021] Preferably, the base material further comprises 3 to 8 parts of a bio-based toughening resin, and the bio-based toughening resin is epoxy soybean oil-modified polyurethane or cardanol glycidyl ether.

[0022] Preferably, the defoamer is selected from one or more of silicone defoamers, mineral oil defoamers and acetylenic diol defoamers; the thickener is selected from one or more of polyurethane associative thickeners, hydrophobically modified alkali-swellable thickeners, bentonite, hydrophobically modified nanocellulose ether thickeners or associative acrylic thickeners.

[0023] Further preferably, the defoaming agent is selected from one or more of polydimethylsiloxane (PDMS), hydroxyl-terminated polydimethylsiloxane, silicone emulsion defoaming agent (such as BYK-022, BYK-024, TEGO Foamex 810), liquid paraffin, BASF F-111, Defoamer 334, Surfynol104, and Surfynol MD-20.

[0024] Further preferably, the thickener is selected from one or more of RM-2020, Rheovis PU-1190, BYK-420, Rheolate 299, ASE-60, TT-935, Rheovis HS1181AM, organically modified bentonite (such as Bentone SD-1, Claytone 40), hydrophobically modified hydroxyethyl cellulose (such as Natrosol Plus 330), nanocrystalline cellulose (NCC) modified products, and hydrophobically modified polyacrylic acid (such as Rheolate 210, Acrysol RM-8W).

[0025] Preferably, the anionic wetting agent is selected from one or more of sodium dodecylbenzene sulfonate (SDBS), sodium α-olefin sulfonate (AOS), sodium fatty alcohol polyoxyethylene ether sulfate (AES), alkylphenol polyoxyethylene ether phosphate (APEO-PO4), fatty alcohol phosphate salt (MAP or PK), potassium oleate, sodium stearate, sodium polyacrylate (Dispex N40), sodium dioctyl sulfosuccinate (Aerosol OT-75), and alkyl naphthalene sulfonate (TamolNN).

[0026] This application also claims protection for a method for preparing the above-mentioned exposed modified asphalt waterproof coating, comprising the following steps:

[0027] (1) Mixing the SBS modified asphalt emulsion and the acrylic polymer emulsion at 50-65°C and 200-400 rpm for 15-30 minutes;

[0028] (2) heating to 70-85°C, adding bio-based toughening resin, and high-speed shearing at 800-1200 rpm for 30-40 minutes;

[0029] (3) Add nano-functional materials in batches and grind them in a sand mill until D50 ≤ 100 nm;

[0030] (4) Raising the temperature to 50-65°C, adding a slow-release anti-aging agent and a temperature control functional material, and ultrasonically dispersing for 20-30 minutes;

[0031] (5) Add filler, color stabilizer, defoamer, anionic wetting agent, and thickener, and disperse at 1200-1500 rpm for 30-40 minutes;

[0032] (6) The mixture was allowed to stand at 33-37° C. under nitrogen protection for 48 hours with intermittent stirring to obtain the exposed modified asphalt waterproof coating.

[0033] Preferably, in step (3), the sand mill uses zirconia beads, has a linear speed of 10 to 12 m / s, and controls the temperature to be ≤50° C. during the grinding process.

[0034] Preferably, in step (4), the frequency of the ultrasonic dispersion is 40 kHz, and the power density is 50 to 100 W / L.

[0035] The present application also claims protection for the use of the above-mentioned exposed modified asphalt waterproof coating in building exposed waterproofing projects. The coating is applied to the asphalt-based waterproof membrane or concrete surface by spraying, scraping or rolling. The construction environment temperature is 5 to 40°C and the coating thickness is 1.0 to 3.0 mm.

[0036] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0037] 1. The present invention adopts a core-shell structure slow-release anti-aging agent, which slowly releases the active ingredient through the polymethylsilsesquioxane shell, significantly extending the UV protection period, avoiding the failure problem of traditional light stabilizers caused by migration or photolysis, and enabling the coating to maintain excellent anti-aging performance under long-term outdoor exposure;

[0038] 2. The present invention introduces microencapsulated phase change materials, which absorb and release heat in the range of 60-80°C, effectively buffering the impact of drastic changes in ambient temperature on the coating, reducing high-temperature softening and low-temperature embrittlement, and improving the stability of the coating in extreme climates;

[0039] 3、The present application uses metal oxide or phthalocyanine pigment treated by silane coupling agent as color stabilizer, enhances the binding force between pigment and base material, prevents discoloration or powdering caused by ultraviolet rays, and uses nano TiO2 / graphene composite photocatalytic material to decompose surface pollutants, so that the coating is kept clean and beautiful for a long time.

[0040] 4、The nano functional material (graphene loaded TiO2+ nano SiO2) of the present application forms a network enhanced structure, improves the tensile strength, crack resistance and wear resistance of the coating film, and the bio-based toughening resin further improves the flexibility and reduces the risk of cracking caused by deformation of the base layer.

[0041] 5、The present application selects a low VOC water-based emulsion system, combines with high-efficiency defoaming agent and associative thickening agent, ensures that the coating has no bubbles and is not stratified, can adapt to various processes such as spraying, scraping or rolling, can be stably constructed at an ambient temperature of 5-40℃, the film thickness is controllable, and is suitable for various substrates such as concrete and asphalt roll materials.

[0042] 6、The components of the present application are uniformly compounded through step-by-step mixing and nano-scale dispersion process, avoiding filler settlement or agglomeration, and the final product has waterproofness, weather resistance, decorative property and long service life, and the comprehensive performance is significantly better than that of traditional modified asphalt coating. DETAILED DESCRIPTION

[0043] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific implementation schemes are described in detail.

[0044] The present application will be further described below in combination with examples, but the present application is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to different requirements of specific use, and the implementation conditions indicated are the conventional conditions in the industry. The technical features involved in each embodiment of the present application can be combined with each other as long as there is no conflict.

[0045] Example 1

[0046] The present embodiment provides an exposed type modified asphalt waterproof coating, which comprises the following components by weight parts:

[0047] Base material: the base material comprises 50 parts of SBS modified asphalt emulsion, 12 parts of acrylate polymer emulsion and 5 parts of bio-based toughening resin, and the bio-based toughening resin is epoxy soybean oil modified polyurethane.

[0048] Slow-release anti-aging agent 1 part: the slow-release anti-aging agent is a core-shell structure microcapsule, the inner core is composed of a hindered amine light stabilizer and a benzotriazole ultraviolet absorber in a mass ratio of 4:1, and the shell is polymethylsilsesquioxane; the hindered amine light stabilizer is LS111, and the benzotriazole ultraviolet absorber is UV928; the particle size of the slow-release anti-aging agent microcapsule is 500 μm, and the shell thickness is 500 nm;

[0049] Temperature control functional material 10 parts: the temperature control functional material is a microencapsulated phase change material with a melting point of 70℃, which is a paraffin / expanding graphite composite material, and the porosity of the expanding graphite is 90%;

[0050] Color stabilizer 1.5 parts: the color stabilizer is iron oxide red surface treated with silane coupling agent KH-550;

[0051] Nano functional material: the nano functional material includes 4 parts of graphene loaded anatase TiO2 and 2 parts of nano silicon dioxide, wherein the TiO2 is combined on the surface of graphene through a C-O-Ti bond;

[0052] Filler 30 parts: the filler is 30% of nano calcium carbonate filler treated with silane coupling agent KH-570;

[0053] Defoaming agent 1 part: the defoaming agent is BYK-022 silicone defoaming agent

[0054] Anionic wetting agent 2 parts: the anionic wetting agent is sodium dodecyl benzene sulfonate;

[0055] Thickening agent 1 part: the thickening agent is DSX3290 polyurethane associative thickening agent;

[0056] The preparation method of the above-mentioned exposed type modified asphalt waterproof coating, comprising the following steps:

[0057] (1) Mix the SBS modified asphalt emulsion and the acrylate polymer emulsion at 63℃ and 300 rpm for 25 min;

[0058] (2) Increase the temperature to 80℃, add the bio-based toughening resin, and shear at a high speed of 1000 rpm for 35 min;

[0059] (3) Add graphene / TiO2 and nano SiO2 in portions, and circulate and grind in a zirconium oxide bead mill (linear speed 11 m / s, pressure 0.5 MPa) until D50≤100 nm;

[0060] (4) Reduce the temperature to 60℃, add the slow-release anti-aging agent and the temperature control functional material, and ultrasonically disperse at an ultrasonic dispersion frequency of 40 kHz for 25 min;

[0061] (5) Add filler, color stabilizer, defoamer, anionic wetting agent, and thickener, and disperse at 1400 rpm for 35 minutes;

[0062] (6) The exposed modified asphalt waterproof coating was obtained by standing the mixture at 35° C. under nitrogen protection for 48 hours with intermittent stirring.

[0063] Example 2

[0064] This embodiment is based on the above embodiment 1, and the similarities with the above embodiment 1 are not repeated here.

[0065] In this embodiment, the slow-release anti-aging agent is changed to 0.5 parts (LS111:UV928=3:1).

[0066] Example 3

[0067] This embodiment is based on the above embodiment 1, and the similarities with the above embodiment 1 are not repeated here.

[0068] In this embodiment, the temperature control functional material is changed to 8 parts of organic paraffin (melting point 65° C.).

[0069] Comparative Example 1

[0070] This comparative example is based on the above-mentioned Example 1, and the similarities with the above-mentioned Example 1 are not repeated here.

[0071] In this comparative example, no slow-release anti-aging agent was added.

[0072] Comparative Example 2

[0073] This comparative example is based on the above-mentioned Example 1, and the similarities with the above-mentioned Example 1 are not repeated here.

[0074] There is no nano-functional material in this comparative example.

[0075] Comparative Example 3

[0076] This comparative example is based on the above-mentioned Example 1, and the similarities with the above-mentioned Example 1 are not repeated here.

[0077] This comparative example contains 60 parts of SBS modified asphalt emulsion, 40 parts of ordinary filler, and 1 part of mineral oil defoamer, but does not contain any sustained-release anti-aging agent, temperature control functional material, or nano-functional material.

[0078] The waterproof coatings prepared in the above examples and comparative examples were tested, and the test results are shown in Table 1.

[0079] Table 1

[0080]

[0081] The table above shows that in terms of aging resistance, Examples 1-3, due to their use of core-shell microcapsule sustained-release technology, all achieved ΔE values ​​≤ 2.1 after UV aging, significantly outperforming Comparative Examples 1 and 3. However, cracking in Comparative Example 1 due to adjuvant migration demonstrates the necessity of sustained-release microcapsules. Regarding temperature adaptability, Example 1 exhibited a surface temperature difference of ≤ 10°C, significantly outperforming Comparative Example 3, demonstrating the phase change material's effective buffering of temperature stress. However, Example 3, due to its slightly poorer thermal conductivity, exhibited slightly inferior temperature-regulating effects to Example 1. Regarding mechanical properties, Example 1 exhibited the highest tensile strength and elongation at break, attributed to the graphene / TiO2 nanoreinforcement and bio-based toughening resin. Comparative Example 2 exhibited a decrease in mechanical properties by over 16%, demonstrating the crucial role of nanomaterials. Regarding color stability, Examples 1-3 achieved a color difference ΔE value ≤ 1.8, while Comparative Examples 1-3 achieved a color difference ΔE value ≥ 2.7, demonstrating the importance of silane coupling agent-treated pigments and nano-TiO2 photocatalytic decomposition of pollutants for color retention.

[0082] In summary, the present invention adopts a core-shell structure slow-release anti-aging agent, which slowly releases the active ingredient through the polymethylsilsesquioxane shell, significantly prolongs the UV protection period, avoids the failure problem of traditional light stabilizers due to migration or photolysis, and enables the coating to maintain excellent anti-aging performance under long-term outdoor exposure; the present invention introduces microencapsulated phase change materials, which absorb and release heat in the range of 60 to 80°C, effectively buffer the impact of drastic changes in ambient temperature on the coating, reduce high-temperature softening and thermal attenuation of performance, and improve the stability of the coating in extreme climates; the present invention uses metal oxides or phthalocyanine pigments treated with silane coupling agents as color stabilizers to enhance the binding force between the pigment and the base material, prevent fading or powdering caused by ultraviolet rays, and at the same time adopts nano-TiO2 / graphene composite photocatalytic materials to decompose surface pollutants and maintain the coating. The coating remains clean and beautiful for a long time; the nano-functional material (graphene loaded TiO2 + nano-SiO2) of the present invention forms a network reinforcement structure to improve the tensile strength, crack resistance and wear resistance of the coating; the bio-based toughening resin further improves the flexibility and reduces the risk of cracking caused by deformation of the base layer; the present invention selects a low-VOC aqueous emulsion system, combined with a high-efficiency defoaming agent and an associative thickener to ensure that the coating is bubble-free and non-stratified, and can adapt to various processes such as spraying, scraping or rolling. It can be stably constructed at an ambient temperature of 5 to 40°C, and the film thickness is controllable. It is suitable for various base surfaces such as concrete and asphalt rolls; the various components of the present invention are uniformly compounded through step-by-step mixing and nano-scale dispersion technology to avoid filler sedimentation or agglomeration. The final product has waterproofness, weather resistance, decorativeness and long life, and its comprehensive performance is significantly better than that of traditional modified asphalt coatings.

[0083] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An exposed modified asphalt waterproof coating, characterized in that: Calculated by weight, it includes the following components: 48-75 parts of base material; 0.1-2 parts of slow-release anti-aging agent; 5-15 parts of temperature control functional material; 0.5-3 parts of color stabilizer; 3-8 parts of nano functional material; 20-50 parts of filler; 0.5-2 parts of defoaming agent; 1-3 parts of anionic wetting agent; 0.5-2 parts of thickener; Wherein, the base material comprises 35-52 parts of SBS modified asphalt emulsion and 10-15 parts of acrylic polymer emulsion; The slow-release anti-aging agent is a core-shell structure microcapsule, the core of which is composed of a hindered amine light stabilizer and a benzotriazole ultraviolet absorber in a mass ratio of 3 to 5:1, and the shell is polymethylsilsesquioxane; the hindered amine light stabilizer is selected from one of LS111 and UV4050, and the benzotriazole ultraviolet absorber is selected from one of UV928 and UV234; The temperature control functional material is a microencapsulated phase change material with a melting point of 60 to 80° C., selected from a polyurethane / sodium sulfate composite material, a paraffin / expanded graphite composite material, or an organic paraffin; The color stabilizer is a metal oxide or phthalocyanine pigment surface-treated with a silane coupling agent; The nano-functional material comprises 2 to 5 parts of graphene-loaded anatase TiO2 and 1 to 3 parts of nano-silicon dioxide, wherein the TiO2 is bonded to the graphene surface via a CO-Ti bond; The filler is selected from one or more of silicon dioxide, aluminum hydroxide, talc, and calcium carbonate, and at least 20% of the filler is nano-scale filler treated with a silane coupling agent.

2. The exposed modified asphalt waterproof coating according to claim 1, characterized in that: The microcapsule particle size of the slow-release anti-aging agent is 1 to 1000 μm, and the shell thickness is 100 to 800 nm; The number of graphene layers is ≤5, and the supported TiO2 particle size is 20-50nm; The temperature control functional material is a paraffin / expanded graphite composite material, and the porosity of the expanded graphite is 85% to 95%.

3. The exposed modified asphalt waterproof coating according to claim 1, characterized in that: The base material also includes 3 to 8 parts of bio-based toughening resin, and the bio-based toughening resin is epoxy soybean oil-modified polyurethane or cardanol glycidyl ether.

4. The exposed modified asphalt waterproof coating according to claim 1, characterized in that: The defoaming agent is selected from one or more of silicone defoaming agents, mineral oil defoaming agents and acetylene glycol defoaming agents; the thickener is selected from one or more of polyurethane associative thickeners, hydrophobically modified alkali swelling thickeners, bentonite, hydrophobically modified nanocellulose ether thickeners or associative acrylic thickeners.

5. A method for preparing the exposed modified asphalt waterproof coating according to any one of claims 1 to 4, characterized in that: The steps include: (1) Mixing the SBS modified asphalt emulsion and the acrylic polymer emulsion at 50-65°C and 200-600 rpm for 15-30 minutes; (2) heating to 70-85°C, adding bio-based toughening resin, and high-speed shearing at 800-1200 rpm for 30-40 minutes; (3) Add nano-functional materials in batches and grind them in a sand mill until D50 ≤ 100 nm; (4) Raising the temperature to 50-65°C, adding a slow-release anti-aging agent and a temperature control functional material, and ultrasonically dispersing for 20-30 minutes; (5) Add filler, color stabilizer, defoamer, anionic wetting agent, and thickener, and disperse at 1200-1500 rpm for 30-40 minutes; (6) The mixture was allowed to stand at 33-37° C. under nitrogen protection for 48 hours with intermittent stirring to obtain the exposed modified asphalt waterproof coating.

6. The method for preparing the exposed modified asphalt waterproof coating according to claim 5, characterized in that: In step (3), the sand mill uses zirconia beads, a linear speed of 10 to 12 m / s, a grinding pressure of 0.4 to 0.6 MPa, and the temperature is controlled to be ≤50° C. during the grinding process.

7. The method for preparing the exposed modified asphalt waterproof coating according to claim 5, characterized in that: In step (4), the frequency of the ultrasonic dispersion is 40 kHz and the power density is 50 to 100 W / L.

8. An application of the exposed modified asphalt waterproof coating according to any one of claims 1 to 4 or the exposed modified asphalt waterproof coating prepared by the preparation method of the exposed modified asphalt waterproof coating according to any one of claims 5 to 7 in exposed waterproofing projects of buildings, characterized in that: The coating is applied to the asphalt-based waterproof membrane or concrete surface by spraying, scraping or rolling, the construction environment temperature is 5° C. to 40° C., and the coating thickness is 1.0 to 3.0 mm.

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