High-strength weather-resistant asphalt waterproof coating and preparation method thereof

Abstract

The invention relates to the technical field of waterproof coatings, and discloses a high-strength weather-resistant asphalt waterproof coating and a preparation method thereof. Wherein the waterproof coating is prepared from the following components in percentage by mass: 45-55% of No. 70 petroleum asphalt or No. 90 petroleum asphalt; 7%-12% of a styrene thermoplastic elastomer; 3%-5% of a nano oxide material; 1%-2% of an ultraviolet light absorber; 0.5%-1% of an antioxidant; 5%-10% of a tackifier; 2%-3% of an emulsifier; 20%-30% of a filler; and 3%-5% of water. The preparation method comprises the steps of base material preparation, emulsion preparation, emulsified asphalt preparation, functional additive mixing and filler mixing. According to the high-strength weather-resistant asphalt waterproof coating provided by the invention, through the synergistic effect of the nano oxide material, the ultraviolet light absorber and the antioxidant, the mechanical property of a coating film is improved, meanwhile, a free radical chain reaction is effectively inhibited, the weather resistance is further enhanced, and the service life is further prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waterproof coating, in particular to a high-strength weather-resistant asphalt waterproof coating and a preparation method thereof. BACKGROUND

[0002] Traditional asphalt waterproof coating is widely used in the fields of building, underground engineering and bridge waterproofing due to its good waterproof performance and low production cost. However, in practical application, due to the influence of environmental factors (such as high temperature, low temperature, ultraviolet light, etc.), traditional asphalt waterproof coating is prone to aging, cracking, peeling and other problems, which leads to a decrease in waterproof performance and seriously affects the service life of the project.

[0003] In the prior art, the weather resistance of asphalt coating is partially improved by adding modifiers (such as polymers, toughening agents, etc.), but there are usually the following deficiencies: (1) The problems of high-temperature softening and low-temperature embrittlement have not been completely solved, especially under extreme weather conditions. (2) The ultraviolet resistance is limited, and the coating is prone to aging failure when exposed to sunlight for a long time. (3) The strength and flexibility are difficult to balance, and it is difficult to meet the comprehensive performance requirements of materials for complex projects. SUMMARY

[0004] The present application aims to at least solve one of the problems in the prior art or related art.

[0005] To this end, the first aspect of the present application provides a high-strength weather-resistant asphalt waterproof coating, which is composed of the following components in terms of mass percentage:

[0006] 70# petroleum asphalt or 90# petroleum asphalt: 45%-55%;

[0007] Styrene-based thermoplastic elastomer: 7%-12%;

[0008] Nano-oxide material: 3%-5%;

[0009] Ultraviolet absorber: 1%-2%;

[0010] Antioxidant: 0.5%-1%;

[0011] Tackifier: 5%-10%;

[0012] Emulsifier: 2%-3%;

[0013] Filler: 20%-30%;

[0014] Water: 3%-5%.

[0015] Further, the styrene-based thermoplastic elastomer is a styrene-butadiene-styrene block copolymer, or / and a hydrogenated styrene-butadiene-styrene block copolymer.

[0016] Further, the nano-oxide material is nano-silica or / and nano-alumina.

[0017] Further, the ultraviolet absorber is selected from one or several of benzophenone and its derivatives, benzotriazole and its derivatives.

[0018] Further, the antioxidant is tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester, or / and, tris(2,4-di-tert-butylphenyl) phosphite.

[0019] Further, the tackifier is rosin resin or / and phenolic resin; the filler is heavy calcium carbonate or / and talc.

[0020] Further, the emulsifier is selected from one or several of non-ionic emulsifiers or / and anionic emulsifiers.

[0021] Further, the emulsifier is fatty alcohol polyoxyethylene ether.

[0022] Further, the performance of the high-strength weather-resistant asphalt waterproof coating includes:

[0023] High-temperature performance: no flow at 70℃ for 5 hours;

[0024] Low-temperature flexibility: ultimate breaking temperature below -25℃;

[0025] Breaking elongation: no less than 800%;

[0026] Ultraviolet treatment breaking elongation retention rate no less than 88%;

[0027] Thermal aging performance breaking elongation retention rate no less than 89%;

[0028] Adhesion no less than 2.5MPa.

[0029] In the second aspect of the present application, a preparation method of the high-strength weather-resistant asphalt waterproof coating is provided, including the following steps:

[0030] Base preparation: heat No. 70 or No. 90 petroleum asphalt to 160-180℃, then add the styrene-based thermoplastic elastomer to stir and dissolve, then add the tackifier, fully stir to completely dissolve, and cool to 140-150℃ to obtain the base;

[0031] Emulsion preparation: disperse the emulsifier in water, and control the temperature to 60-70℃ to form the emulsion;

[0032] Emulsified asphalt preparation: slowly add the base to the emulsion, and emulsify at 2000 rpm-3000 rpm for 20 min-30 min to obtain the emulsified asphalt;

[0033] Functional additive mixing: add the ultraviolet absorber, the antioxidant and the nano-oxide material to the emulsified asphalt, and stir for 10 min-20 min;

[0034] Filler mixing: finally add the filler, and stir for 8 min-15 min to obtain the high-strength weather-resistant asphalt waterproof coating.

[0035] Compared with the prior art, at least the following beneficial effects are included:

[0036] The high-strength weather-resistant asphalt waterproof coating provided by the application can effectively inhibit the free radical chain reaction and further enhance the weather resistance and service life by the synergistic effect between the nano-oxide material, the ultraviolet absorber and the antioxidant while improving the mechanical properties of the coating film. DETAILED DESCRIPTION

[0037] In order to better understand the above technical solutions, the technical solutions of the application will be described in detail below through specific embodiments.

[0038] In a first aspect, the application provides a high-strength weather-resistant asphalt waterproof coating, which is composed of the following components in terms of mass percentage: 70# petroleum asphalt or 90# petroleum asphalt: 45%-55%; styrene-based thermoplastic elastomer: 7%-12%; nano-oxide material: 3%-5%; ultraviolet absorber: 1%-2%; antioxidant: 0.5%-1%; tackifier: 5%-10%; emulsifier: 2%-3%; filler: 20%-30%; water: 3%-5%.

[0039] The high-strength weather-resistant asphalt waterproof coating of the application is mainly composed of 70# petroleum asphalt or 90# petroleum asphalt, and the synergistic effect between the nano-oxide material, the ultraviolet absorber and the antioxidant can effectively inhibit the free radical chain reaction and further enhance the weather resistance and service life while improving the mechanical properties of the coating film. In addition, the high specific surface area of the nano-oxide material makes it exhibit good synergistic effect when coexisting with the ultraviolet absorber and the antioxidant. On the one hand, the nanoparticles can act as scattering centers of ultraviolet light to improve the ultraviolet protection efficiency; on the other hand, the nanoparticles can load or stabilize antioxidant molecules on their surfaces to inhibit the formation and diffusion of free radicals, thereby slowing down the aging process of the asphalt matrix. This synergistic mechanism not only improves the thermal-oxidative stability of the coating film, but also further improves the strength retention rate and appearance integrity during long-term use.

[0040] The 70# or 90# petroleum asphalt has the following advantages: a. moderate softening point, giving consideration to construction and use performance, the softening point of the 70# and 90# petroleum asphalt is generally 45-55 DEG C, and a good film body can be formed at normal temperature to medium temperature; b. good compatibility with a polymer modifier (such as SBS / SEBS), the 70# and 90# asphalt is used as conventional road and building petroleum asphalt, the aromatic hydrocarbon structure ratio is moderate, and good polarity and compatibility are achieved, so that a stable network structure can be formed with SBS, SEBS and other styrene thermoplastic elastomers; c. strong industrial universality, rich resources and moderate cost, the 70# and 90# asphalt is a product with high standardization degree, stable supply and moderate price at present, so that the raw material cost of the whole system can be reduced, and large-scale industrialization is facilitated.

[0041] Specifically, the high-strength weather-resistant asphalt waterproof coating of the embodiment of the present application optimizes the raw material composition and quality ratio of the asphalt waterproof coating from four aspects of high-strength matrix design, weather resistance optimization, flexibility enhancement and interface adhesion enhancement, and the specific optimization is as follows:

[0042] (1) High-strength matrix: the synergistic effect of styrene thermoplastic elastomer modified asphalt and nano oxide material improves the film strength and tensile properties.

[0043] (2) Weather resistance optimization: the introduction of ultraviolet absorber and antioxidant significantly improves the ultraviolet resistance of the coating and delays the aging process.

[0044] (3) Flexibility enhancement: the addition of styrene thermoplastic elastomer improves the low-temperature flexibility and crack resistance of the coating film, and adapts to temperature changes.

[0045] (4) Interface adhesion enhancement: the use of emulsifier improves the adhesion performance of the coating film and the substrate, and ensures that it does not peel off for a long time.

[0046] (5) Through single factor experiment, the optimal mass ratio of styrene thermoplastic elastomer, nano oxide material, ultraviolet absorber, antioxidant and emulsifier is determined.

[0047] In some embodiments, the styrene thermoplastic elastomer is a styrene-butadiene-styrene block copolymer (SBS elastomer), or / and a hydrogenated styrene-butadiene-styrene block copolymer (SEBS elastomer).

[0048] Specifically, the SBS elastomer or SEBS elastomer can significantly improve the elasticity and low-temperature performance of the asphalt, and through compatibility modification, the coating film maintains good flexibility at low temperature.

[0049] In some embodiments, the nano oxide material is nano silicon dioxide or / and nano aluminum oxide.

[0050] Specifically, the nano-oxide material is nano-silica or nano-alumina, which is dispersed in the asphalt matrix to improve the mechanical properties and thermal stability of the coating film through the interaction between the nano-particles and the asphalt molecules. The average particle size of the nano-silica or nano-alumina is 20-80 nm, the specific surface area (BET) is ≥150 m 2 / g, the loss on drying (105°C) is ≤1%, and the high specific surface area can adsorb and load the ultraviolet absorbers and antioxidants on the surface to form a combined barrier of ultraviolet shielding and anti-oxidation, thereby improving the thermal oxidation stability and aging resistance of the material. We also tried nano-titanium white powder (TiO2) and nano-calcium carbonate, found that although the nano-titanium white powder has strong ultraviolet shielding, it has high photocatalytic side reaction activity, which accelerates the aging of the coating film; and the nano-calcium carbonate has poor dispersibility and is easy to agglomerate, and does not form obvious strengthening effect. Therefore, the nano-oxide material is preferably nano-silica or / and nano-alumina.

[0051] In some embodiments, the ultraviolet absorber is selected from one or more of benzophenone and its derivatives, benzotriazole and its derivatives.

[0052] Specifically, the ultraviolet absorber can absorb ultraviolet energy to prevent the degradation of the surface layer of the coating film; the ultraviolet absorber is preferably a benzophenone ultraviolet absorber or a benzotriazole ultraviolet absorber, which has high-efficiency anti-UV performance and effectively prolongs the service life of the coating film. The triazine ultraviolet absorber has the advantages of wide absorption band and strong thermal stability, but its cost is relatively high, and experiments have found that it is difficult to disperse the emulsion system of the triazine ultraviolet absorber. Although the salicylate ultraviolet absorber has low cost, it has short absorption band, and is easy to volatilize and migrate, and has poor durability.

[0053] Further, the benzophenone type ultraviolet absorber or the benzotriazole type ultraviolet absorber has the following advantages: 1) wide waveband coverage, which can effectively block UVA+UVB; among them, the benzophenone type mainly absorbs wavelengths of 290nm-350nm, which is suitable for preventing surface cracking and color change; the benzotriazole type absorbs wavelengths of 300nm-400nm, which can deeply protect UVA and prevent structural degradation and chain aging reaction. 2) Good compatibility with asphalt and elastomer system; the benzophenone type has high compatibility with asphalt, and is well dispersed in emulsified asphalt without precipitation; the benzotriazole type contains a polar functional group, which can form weak force with emulsifiers and SBS / SEBS, etc. polar segment to improve stability; this makes it can be uniformly distributed for a long time and continuously exert its effectiveness in the formula of the present application. 3) Superior thermal stability and anti-migration performance; the benzophenone type or the benzotriazole type ultraviolet absorber has low thermal decomposition rate in high temperature (>100℃) environment, which is suitable for waterproof layer exposure or hot construction conditions; compared with traditional salicylate type ultraviolet absorber, it has low migration rate and is not easy to lose with water or volatile components, which ensures the service life of the coating film. 4) The benzophenone type or the benzotriazole type ultraviolet absorber can synergistically stabilize with antioxidants / nano-oxide fillers; the ultraviolet absorber can form a physical adsorption layer on the surface of nano-silicon dioxide and nano-aluminum oxide to slow down its decomposition; at the same time, it cooperates with antioxidants (such as antioxidant 1010 / 168), which can block ultraviolet energy on one hand and remove generated free radicals on the other hand, to jointly inhibit the photo-oxidative aging chain reaction.

[0054] In some embodiments, the antioxidant is antioxidant 1010 or / and antioxidant 168; wherein the antioxidant 1010 refers to tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, and the antioxidant 168 refers to tris(2,4-di-tert-butylphenyl) phosphite.

[0055] Specifically, the antioxidant plays a role in delaying the thermal oxidative aging of the coating, the phenolic antioxidant (monomer type) is volatile, poor thermal stability, easy to migrate, and has a heavy odor. The amine antioxidant is prone to discoloration and pollution of the system, and is not suitable for building exterior materials. The antioxidant 1010 or antioxidant 168 is selected in the embodiment of the application, which has the following advantages: 1) high thermal stability, suitable for hot processing and high temperature use; among them, the melting point of antioxidant 1010 is higher than 110℃, and the decomposition temperature is >300℃; the decomposition temperature of antioxidant 168 is also >200℃, which will not decompose and fail in the emulsification process or hot construction; it provides protection for the long-term stability of waterproof coating under high temperature exposure or hot construction conditions. 2) low migration rate and good durability; compared with small molecule antioxidants such as BHT and TBHQ, antioxidants 1010 and 168 are macromolecular structures, which are not easy to migrate or volatilize; effectively avoiding the problem of “early release and late failure” of antioxidants, realizing long-term anti-aging effect. 3) good compatibility, does not affect the appearance and color stability of the coating film; compared with amine antioxidants (such as 6PPD) which often cause discoloration or yellowing, antioxidants 1010 and 168 are neutral in asphalt / elastomer system, the coating film does not turn white, does not return sticky, and has no separation phenomenon, ensuring the stability of the system and the construction aesthetics.

[0056] In some embodiments, the tackifier is a rosin resin or / and a phenolic resin; and the filler is heavy calcium carbonate or / and talc.

[0057] Specifically, the tackifier is a rosin resin or / and a phenolic resin, which, when used together with the ultraviolet absorber and the antioxidant, synergistically inhibits the photo-oxidative aging reaction and improves the service life. The rosin resin and the phenolic resin have the following advantages: 1) enhancing the adhesion of the coating film to the substrate: the rosin resin contains a large number of polar groups (such as carboxyl and ester groups), which can easily form hydrogen bonds or van der Waals forces with the surface of the substrate (especially concrete, mortar, etc.), significantly improving the initial adhesion and long-term adhesion of the coating. The phenolic resin is thermoplastic at room temperature, and gradually undergoes thermal curing or crosslinking reaction after construction, forming a network structure with the asphalt and elastomer system, and improving the bonding strength and heat peeling resistance. 2) improving the rheological property and construction adaptability: the rosin resin itself has good thickening and plasticizing functions, which can improve the flowability and brushability of the coating; it has good compatibility with emulsifiers, does not affect the stability of the emulsified asphalt, and is beneficial to the formation of a uniform and delicate coating film surface. 3) improving the mechanical properties and aging resistance of the system: the phenolic resin can build a semi-crosslinked rigid skeleton in the coating film, improving the tensile strength.

[0058] Further, the fillers are selected from heavy calcium carbonate or / and talcum powder, which has the following advantages: 1) cost control and good filling property of the system: heavy calcium carbonate (particle size of 800 mesh or more) is low in price, widely available and high in whiteness, and is the inorganic filler with the best cost performance; talcum powder has good particle stability, which can significantly reduce the shrinkage of the system and improve the volume solid content. 2) improve the compactness and mechanical strength of the coating film: the heavy calcium carbonate particles form a micro-skeletal structure in the coating film, effectively filling the pores in the system, and improving the compactness and water permeability resistance of the coating film; talcum powder has a layered structure, which can improve the crack resistance and scratch resistance of the coating after interacting with the polymer / bitumen. 3) improve the thermal stability and rheological property: talcum powder has good thermal conductivity and thermal stability, which helps to disperse thermal stress in high temperature environment, preventing the coating film from bubbling or softening and flowing; at the same time, its "flaky filler" structure improves the flowability, making the coating more smooth for construction, and adapting to various construction methods such as spraying and brushing.

[0059] In some embodiments, the emulsifier is selected from one or more of non-ionic emulsifiers or / and anionic emulsifiers. Preferably, the emulsifier is a fatty alcohol polyoxyethylene ether.

[0060] Specifically, by optimizing the emulsification process, the coating has uniform particle distribution and good rheological property, which is convenient for construction. The fatty alcohol polyoxyethylene ether as an emulsifier has the following advantages: 1) moderate HLB value, suitable for emulsifying high molecular modified bitumen system; the HLB value of AEO non-ionic emulsifier is usually between 11-13, which is suitable for emulsifying non-polar or weakly polar system; it can stably coat modified bitumen particles (such as SBS, SEBS modified material), forming an emulsion with concentrated particle size distribution and stable storage. 2) high thermal stability, not prone to delamination and coarsening; the fatty alcohol structure provides good heat resistance and shear resistance, and the emulsion does not break at 60-70℃ during preparation; after long-term storage of the coating, the particle size changes little, there is no oil floating and no flocculation phenomenon, which is beneficial to on-site construction. 3) good compatibility with other components of the waterproof system; AEO non-ionic emulsifier does not have ion exchange reaction with nano-oxide, ultraviolet absorber and antioxidant, and does not interfere with the dispersion and stability of functional components; no obvious surfactant is left during the coating film forming process, which does not affect the adhesion and waterproof performance in the later period. 4) environmentally friendly and safe, in line with the development direction of green building materials; AEO non-ionic emulsifier is non-ionic and does not contain phosphorus, heavy metals or nitrogen heterocyclic structure, which is friendly to human body and environment; no VOC is released after film formation, which meets the design goal of low VOC waterproof material.

[0061] In a second aspect of the embodiment of the present application, a preparation method of the high-strength weather-resistant bitumen waterproof coating is provided, which comprises the following steps:

[0062] Base preparation: 70# petroleum pitch or 90# petroleum pitch is heated to 160-180 DEG C, then styrene-based thermoplastic elastomer is stirred and dissolved, then tackifier is added, fully stirred until completely dissolved, cooled to 140-150 DEG C, to obtain base;

[0063] Emulsion preparation: the emulsifier is dispersed in water, and the temperature is controlled at 60-70 DEG C to form an emulsion;

[0064] Emulsified asphalt preparation: the base is slowly added to the emulsion, and high-speed shearing is carried out at 2000-3000 rpm for 20-30 min to obtain emulsified asphalt;

[0065] Functional additive mixing: the ultraviolet absorber, antioxidant and nano oxide material are added to the emulsified asphalt, and stirred for 10-20 min;

[0066] Filler mixing: finally, the filler is added and stirred for 8-15 min to obtain high-strength weather-resistant asphalt waterproof coating.

[0067] The preparation method of the high-strength weather-resistant asphalt waterproof coating provided by the embodiment of the application has the following beneficial effects: 1) the components are introduced in stages, and the synergistic effect is fully exerted: the thermoplastic elastomer and the tackifier are fused in the high-temperature melting stage of the asphalt, which helps to form a stable elastic network; the functional additives are introduced after emulsification to avoid high-temperature decomposition and improve stability; the filler is added last to avoid affecting the particle size and sedimentation performance during shearing. The uniformity, structural stability and final performance of the system are improved. 2) The temperature, shear rate and time of the whole process are controllable, which ensures the process repeatability: the process window is specified for each stage (such as emulsification temperature 60-70 DEG C, shear rate 2000-3000 rpm, shear time 20-30 min), and the process is highly repeatable, which is convenient for laboratory-pilot-industrial scale-up. The technology can be scaled up, and the quality can be controlled. 3) The emulsification process is optimized, the system is stable, and the particle size is uniform: high-shear emulsification + temperature control + slow addition of base is adopted to avoid coarse particles and demulsification, and the final emulsion is fine, D 50about 1-3 microns, with good workability and storage stability. Achieve the results of waterproof coating without delamination, no rough, easy to pump and spray. 4) fully protect the active ingredients, ensure long-term weatherability: ultraviolet absorbers and antioxidants are added later to avoid pyrolysis at high temperatures; Nanomaterials are added after shearing to ensure uniform dispersion without agglomeration; Achieve enhanced UV and thermal oxidative aging resistance to improve coating life. 5) Suitable for green low VOC production, environmentally friendly and low energy consumption: all water-based emulsification process, no organic solvent is needed; Use mild temperature (not more than 180 DEG C), relatively low energy consumption, high process safety; No waste gas and waste solvent emissions, meet the requirements of green building materials and environmental protection policies.

[0068] In summary, the high-strength weather-resistant asphalt waterproof coating provided by the embodiments of the present application has the following specific performance conditions: high-temperature performance, no coating film flow after 5 hours at 70 DEG C; Low temperature flexibility, ultimate breaking temperature less than -25 DEG C; Elongation at break, not less than 800%; UV treatment elongation at break retention rate not less than 88%; Thermal aging performance elongation at break retention rate not less than 89%; Adhesion not less than 2.5 MPa. In summary, it has the following beneficial effects:

[0069] (1) Weather resistance is improved: significantly improve the high-temperature resistance, low-temperature resistance and ultraviolet resistance of the coating, adapt to extreme weather conditions, delay aging, and significantly improve the service life of the coating.

[0070] (2) Strength and flexibility: by introducing high-performance polymer modifier and nanomaterials, the coating has excellent ductility and crack resistance while maintaining high tensile strength, meeting the comprehensive needs of flexibility and strength in complex engineering.

[0071] (3) Adhesion performance is significantly enhanced: using interface enhancement technology, the coating has higher adhesion strength with various substrates, reducing the risk of peeling.

[0072] (4) Environmental protection and economic benefits: using low VOC emulsification process and green additives, reducing environmental pollution, meeting the green environmental protection concept. The durability of the coating is improved, the maintenance cost is reduced, and good economic benefits are obtained.

[0073] It should be noted that, in the absence of special circumstances, the performance of the high-strength weather-resistant asphalt waterproof coating of the embodiments of the present application is tested according to:

[0074] The coating film is prepared according to standard GB / T 16777-2008.

[0075] High-temperature performance according to GB / T 16777-2008: no coating film flow after 5 hours at 70 DEG C.

[0076] Low temperature flexibility according to GB / T 16777-2008: the temperature at which the test piece just breaks under the test condition.

[0077] Breaking elongation according to JC / 408-2005.

[0078] Breaking elongation retention rate after UV treatment according to JC / 408-2005.

[0079] Breaking elongation retention rate after heat aging according to JC / 408-2005.

[0080] Adhesion according to GB / T 5210-2006: tested by peeling method.

[0081] Example 1 High-strength weather-resistant asphalt waterproof coating and its preparation method

[0082] (I) High-strength weather-resistant asphalt waterproof coating, see Table 1, consisting of the following raw materials by mass percentage: 70# petroleum asphalt: 50%; SEBS elastomer: 8%; nano-silicon dioxide: 3%; benzophenone: 1%; antioxidant 1010: 0.5%; rosin resin: 7%; fatty alcohol polyoxyethylene ether: 2.5%; 800-mesh heavy calcium carbonate: 25%; water: 3%.

[0083] (II) Preparation method, comprising the following steps:

[0084] Step 1: Base material heating and mixing

[0085] 1) Add 70# petroleum-based asphalt in the reaction container, then heat to 170℃;

[0086] 2) Add SEBS elastomer, dissolve after high-speed stirring, then add rosin resin, stir well until completely dissolved;

[0087] 3) Cool down to 150℃ for standby.

[0088] Step 2: Preparation of emulsion

[0089] 1) Add water in another container, add fatty alcohol polyoxyethylene ether step by step;

[0090] 2) Disperse fatty alcohol polyoxyethylene ether in water by high-speed shearing at 1200 rpm to form a stable emulsion;

[0091] 3) Control the emulsion temperature at 65℃.

[0092] Step 3: Preparation of emulsified asphalt

[0093] 1) Slowly add the base material heated to 150℃ into the emulsion while high-speed shearing at 2000 rpm;

[0094] 2) Keep shearing for 25 min until uniform emulsified asphalt is formed.

[0095] Step 4: Functional additive mixing

[0096] 1) Add UV absorber benzophenone, antioxidant 1010 and nano-silica into the emulsified asphalt in sequence;

[0097] 2) Stir for 15 min using high-speed stirrer to ensure uniform distribution of the additives.

[0098] Step 5: Filler mixing

[0099] 1) Add 800-mesh heavy calcium carbonate in the last stage;

[0100] 2) Adjust the stirring speed to 800 rpm and stir for 10 min.

[0101] Step 6: Finished product cooling and storage

[0102] 1) Cool the mixed coating to room temperature to ensure that it does not separate or agglomerate;

[0103] 2) Pack into a sealed container and store in a cool and dry place.

[0104] (Three) Performance test: The performance is shown in Table 2.

[0105] Example 2: A high-strength weather-resistant asphalt waterproof coating and its preparation method

[0106] (I) High-strength weather-resistant asphalt waterproof coating, see Table 1, consisting of the following raw materials in mass percentage: 70# petroleum asphalt: 45%; SEBS elastomer: 12%; nano-silica: 3%; benzophenone: 2%; antioxidant 1010: 1%; rosin resin: 7%; fatty alcohol polyoxyethylene ether: 2%; 800-mesh heavy calcium carbonate: 25%; water: 3%.

[0107] (II) Preparation method: same as Example 1.

[0108] (Three) Performance test: The performance is shown in Table 2.

[0109] Example 3: A high-strength weather-resistant asphalt waterproof coating and its preparation method

[0110] (I) High-strength weather-resistant asphalt waterproof coating, see Table 1, consisting of the following raw materials in mass percentage: 90# petroleum asphalt: 53.5%; SBS elastomer: 7%; nano-silica: 5%; benzophenone: 1%; antioxidant 168: 0.5%; rosin resin: 7%; fatty alcohol polyoxyethylene ether: 3%; 800-mesh heavy calcium carbonate: 20%; water: 3%.

[0111] (ii) Preparation method: same as example 1.

[0112] (iii) Performance test: the performance is shown in table 2.

[0113] A waterproof coating and a preparation method thereof

[0114] (i) The waterproof coating is composed of the following raw materials in percentage by mass: 70# petroleum pitch, SEBS elastomer, nano-silicon dioxide, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of the raw materials is shown in table 1.

[0115] (ii) Preparation method: same as example 1.

[0116] (iii) Performance test: the performance is shown in table 2.

[0117] A waterproof coating and a preparation method thereof

[0118] (i) The waterproof coating is composed of the following raw materials: 70# petroleum pitch, SEBS elastomer, nano-silicon dioxide, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of the raw materials is shown in table 1.

[0119] (ii) Preparation method: same as example 1.

[0120] (iii) Performance test: the performance is shown in table 2.

[0121] A waterproof coating and a preparation method thereof

[0122] (i) The waterproof coating is composed of the following raw materials: 70# petroleum pitch, SEBS elastomer, nano-silicon dioxide, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of the raw materials is shown in table 1.

[0123] (ii) Preparation method: same as example 1.

[0124] (iii) Performance test: the performance is shown in table 2.

[0125] A waterproof coating and a preparation method thereof

[0126] (i) The waterproof coating is composed of the following raw materials: 70# petroleum pitch, SEBS elastomer, nano-silicon dioxide, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of the raw materials is shown in table 1.

[0127] (II) Preparation method, the same as example 1.

[0128] (III) Performance test: performance conditions are shown in table 2.

[0129] Example 1 A waterproof coating and a preparation method thereof

[0130] (I) The waterproof coating is composed of 70# petroleum pitch, SEBS elastomer, nano-silicon dioxide, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of the raw materials is shown in table 1.

[0131] (II) Preparation method, the same as example 1.

[0132] (III) Performance test: performance conditions are shown in table 2.

[0133] Example 2 A waterproof coating and a preparation method thereof

[0134] (I) The waterproof coating is composed of 70# petroleum pitch, SEBS elastomer, nano-silicon dioxide, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of the raw materials is shown in table 1.

[0135] (II) Preparation method, the same as example 1.

[0136] (III) Performance test: performance conditions are shown in table 2.

[0137] Example 3 A waterproof coating and a preparation method thereof

[0138] (I) The waterproof coating is composed of 70# petroleum pitch, SEBS elastomer, nano-silicon dioxide, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of the raw materials is shown in table 1.

[0139] (II) Preparation method, the same as example 1.

[0140] (III) Performance test: performance conditions are shown in table 2.

[0141] Example 4 A waterproof coating and a preparation method thereof

[0142] A waterproof coating, which is composed of 70# petroleum pitch, SEBS elastomer, nano-silica, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of raw materials is shown in Table 1.

[0143] B. Preparation method, which is the same as that of Example 1.

[0144] C. Performance test: the performance is shown in Table 2.

[0145] A waterproof coating and a preparation method thereof

[0146] A waterproof coating, which is composed of 70# petroleum pitch, SEBS elastomer, nano-silica, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of raw materials is shown in Table 1.

[0147] B. Preparation method, which is the same as that of Example 1.

[0148] C. Performance test: the performance is shown in Table 2.

[0149] A waterproof coating and a preparation method thereof

[0150] A waterproof coating, which is composed of 70# petroleum pitch, SEBS elastomer, nano-silica, benzophenone, antioxidant 1010, rosin resin, fatty alcohol polyoxyethylene ether, 800 mesh heavy calcium carbonate and water; the mass percentage of raw materials is shown in Table 1.

[0151] B. Preparation method, which is the same as that of Example 1.

[0152] C. Performance test: the performance is shown in Table 2.

[0153] Table 1 Mass percentage of waterproof coatings provided by examples and comparative examples

[0154]

[0155] Table 2 Performance data comparison of waterproof coatings provided by examples and comparative examples

[0156]

[0157] Results and discussion

[0158] From the examples 1-3, the performance of the high-strength weather-resistant asphalt waterproof coating provided by the examples of the present application is as follows: high-temperature performance, no flow at 70℃ for 5 hours; low-temperature flexibility, the ultimate breaking temperature is lower than -25℃; breaking elongation, no less than 800%; UV treatment breaking elongation retention rate, no less than 88%; heat aging performance breaking elongation retention rate, no less than 89%; adhesion, no less than 2.5 MPa.

[0159] The addition amount of the thermoplastic elastomer in Comparative Example 1 is only 6%, and the experimental results show that the waterproof coating prepared at this addition amount is significantly inferior to the examples of the present application in terms of mechanical properties, adhesion strength, high-temperature stability and weather resistance, indicating that insufficient content of the thermoplastic elastomer will seriously affect the comprehensive performance of the coating, verifying the key supporting role of the elastomer in the performance of the coating.

[0160] In Comparative Example 2, the addition amount of the thermoplastic elastomer is 13%, and it is found in the experiment that too high content of the elastomer can improve the low-temperature flexibility and heat stability, but will cause the viscosity of the system to rise, the emulsification to be difficult, and there are many modified asphalt particles in the coating, the mechanical properties of the coating are unbalanced, the adhesion is decreased, and the performance after aging is prone to decline, the comprehensive performance is inferior to the examples, indicating that the addition of the elastomer needs to be controlled within a reasonable range.

[0161] In Comparative Example 3, the addition amount of the nano-oxide is 2%, and the experimental results show that the UV aging and heat aging performance are greatly reduced, indicating that the nano-oxide not only plays a physical strengthening role in the system, but also is a key component for building a protective barrier for the weather resistance of the coating. Insufficient content will seriously weaken the inhibition ability of free radical reaction and the synergistic stabilization effect of functional components, ultimately leading to the performance degradation of the coating in the use process.

[0162] In Comparative Example 4, the addition amount of the nano-oxide is 6%, and it is found in the experiment that the system stability of the coating is significantly decreased at this ratio, the flexibility of the coating is reduced, and the aging retention rate is actually decreased, indicating that excessive addition of nano-materials not only cannot further improve the performance, but also may cause particle agglomeration, structural stress concentration and system imbalance, thereby leading to the degradation of the comprehensive performance of the waterproof coating. This verifies the necessity of optimizing and controlling the addition amount of the nano-oxide in the present application.

[0163] In Comparative Example 5, no ultraviolet absorber is added, and the experimental results show that the breaking elongation retention rate after UV aging is reduced from 89.5% of the examples to 51.3%, and the heat aging retention rate is also reduced to 79.8%, indicating that the system is easily damaged by UV-induced oxidation reaction without UV protection mechanism. This verifies that the ultraviolet absorber plays a key role in improving the weather resistance and structural stability in the system of the present application, and its absence will significantly reduce the service life and reliability of the coating in actual environment.

[0164] The addition amount of the ultraviolet absorber in Comparative Example 6 is 3%, and it is found in the experiment that although a proper amount of the ultraviolet absorber helps to improve the weather resistance, when the addition amount is too high, the dispersion in the system decreases, the light stabilizer is self-degraded or a photocatalytic side reaction occurs, and finally the UV aging and heat aging properties of the coating film decrease. In addition, an excessive amount of the ultraviolet absorber can also interfere with the stability and adhesion of the emulsion. This comparative example verifies the necessity and scientificity of the optimization control of the addition amount of the ultraviolet absorber in the present application.

[0165] No antioxidant is added in Comparative Example 7, and the experimental results show that the elongation retention rate after heat aging decreases from 91.3% in the embodiment to 46.5%, and the UV aging retention rate also decreases from 89.5% to 72.1%, which shows that the system is prone to chain degradation reaction in a high temperature and oxidizing environment without antioxidant protection mechanism, and the coating film structure is quickly destroyed. This fully proves the importance of the antioxidant in the present application for synergistically constructing an anti-aging system with the ultraviolet absorber, and the absence of the antioxidant will seriously affect the long-term stability and service life of the waterproof coating.

[0166] The addition amount of the antioxidant in Comparative Example 8 is 1.5%, and the experimental results show that an excessive amount of the antioxidant not only fails to further improve the heat aging and UV aging properties, but also causes the system stability to decrease, the mechanical properties to decrease, and even a self-oxidation side reaction to occur due to poor dispersion, enrichment and precipitation, etc. This shows that the antioxidant has a dose sensitivity in the system of the present application, and must be controlled in a reasonable range to achieve the best performance balance.

[0167] The addition amount of the emulsifier in Comparative Example 9 is 1%, and the experimental results show that an insufficient amount of the emulsifier will directly lead to an increase in the particle size of the asphalt emulsion, poor dispersion, a decrease in the stability of the coating system, a loose coating film structure, a decrease in adhesion, and a significant deterioration in the mechanical properties and weather resistance. This shows that the emulsifier is not only a dispersion aid in the system, but also a key factor affecting the uniformity of the coating film structure and the stability of the properties, and the addition amount thereof must be strictly controlled in an optimized range.

[0168] The addition amount of the emulsifier in Comparative Example 10 is 4%, and the experimental observation shows that an excessive amount of the emulsifier will cause an increase in the free surfactant residue in the emulsion, form an enrichment layer during the film forming process, cause a decrease in the adhesion of the coating film, a loose structure, a sticky surface, etc. At the same time, an excessive amount of the emulsifier can also destroy the uniformity of the emulsion particle size distribution and reduce the long-term stability of the emulsion. This result proves that the emulsifier not only needs to ensure a minimum amount to achieve emulsification in the system, but also needs to be strictly controlled to avoid system degradation.

[0169] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed. The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application. The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application. These improvements and variations should also be regarded as the scope of protection of the present application.

Claims

1. A high-strength weather-resistant asphalt waterproof coating, characterized in that: The components are as follows according to mass percentage: No. 70 petroleum asphalt or No. 90 petroleum asphalt: 45%-55%; Styrene thermoplastic elastomer: 7%-12%; Nano oxide materials: 3%-5%; UV absorber: 1%-2%; Antioxidants: 0.5%-1%; Tackifier: 5%-10%; Emulsifier: 2%-3%; Filler: 20%-30%; Water: 3%-5%.

2. The high-strength weather-resistant asphalt waterproof coating according to claim 1, characterized in that: The styrene-based thermoplastic elastomer is a styrene-butadiene-styrene block copolymer or / and a hydrogenated styrene-butadiene-styrene block copolymer.

3. The high-strength weather-resistant asphalt waterproof coating according to claim 1, characterized in that: The nano-oxide material is nano-silicon dioxide and / or nano-aluminum oxide.

4. The high-strength weather-resistant asphalt waterproof coating according to claim 1, characterized in that: The ultraviolet absorber is selected from one or more of benzophenone and its derivatives, benzotriazole and its derivatives.

5. The high-strength weather-resistant asphalt waterproof coating according to claim 1, characterized in that: The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, or / and tris(2,4-di-tert-butylphenyl) phosphite.

6. The high-strength weather-resistant asphalt waterproof coating according to claim 1, characterized in that: The tackifier is rosin resin and / or phenolic resin; the filler is heavy calcium carbonate and / or talc.

7. The high-strength weather-resistant asphalt waterproof coating according to claim 1, characterized in that: The emulsifier is selected from one or more of nonionic emulsifiers and / or anionic emulsifiers.

8. The high-strength weather-resistant asphalt waterproof coating according to claim 7, characterized in that: The emulsifier is fatty alcohol polyoxyethylene ether.

9. The high-strength weather-resistant asphalt waterproof coating according to any one of claims 1 to 8, characterized in that: The performance of the high-strength weather-resistant asphalt waterproof coating includes: High temperature performance: the coating does not flow after being placed at 70℃ for 5 hours; Low temperature flexibility, the ultimate breaking temperature is lower than -25℃; Elongation at break, not less than 800%; The retention rate of elongation at break after UV treatment is not less than 88%; The retention rate of elongation at break of thermal aging performance is not less than 89%; The adhesion is not less than 2.5MPa.

10. A method for preparing a high-strength weather-resistant asphalt waterproof coating, characterized in that: The method for preparing the high-strength weather-resistant asphalt waterproof coating according to any one of claims 1 to 9 comprises the following steps: Preparation of base material: Heat No. 70 petroleum asphalt or No. 90 petroleum asphalt to 160-180° C., then add the styrene-based thermoplastic elastomer and stir to dissolve, then add the tackifier and stir thoroughly until completely dissolved, then cool to 140-150° C. to obtain the base material; Preparation of emulsion: dispersing the emulsifier in water and controlling the temperature to 60°C-70°C to form the emulsion; Preparation of emulsified asphalt: slowly adding the base material to the emulsion, while high-speed shearing emulsification at 2000 rpm-3000 rpm for 20 min-30 min to obtain the emulsified asphalt; Functional additive mixing: adding the ultraviolet absorber, the antioxidant and the nano-oxide material to the emulsified asphalt and stirring for 10-20 minutes; Filler mixing: finally add the filler and stir for 8-15 minutes to obtain the high-strength weather-resistant asphalt waterproof coating.

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