Novel asphalt waterproof material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of asphalt, and particularly provides a novel asphalt waterproof material as well as a preparation method and application thereof, and the novel asphalt waterproof material comprises the following raw materials in percentage by mass: 50-70% of matrix asphalt, 2-3% of a low-temperature-resistant modifier, 0.5-1% of a compatilizer, 0.01-0.03% of a catalyst and the balance of a solvent. The novel asphalt waterproof material disclosed by the invention can be applied to a waterproof coiled material and waterproof coating system, and is good in low-temperature flexibility and high in anti-aging stability.

Description

Technical Field

[0001] This invention belongs to the field of asphalt technology, specifically providing a novel asphalt waterproofing material, its preparation method, and its application. Background Technology

[0002] Waterproof asphalt, as a core material in the field of building waterproofing engineering, has long been widely used in roofs, underground structures, tunnels, bridges, and many other scenarios due to its excellent impermeability, adhesion, flexibility, and significant cost advantages. It plays a crucial role in preventing water penetration, protecting building structures, and extending the lifespan of projects, making it an indispensable "invisible guardian" in modern construction engineering. However, with the continuous improvement of the construction industry's requirements for waterproofing performance, durability, and environmental protection, the inherent defects of traditional single-base asphalt are becoming increasingly prominent. As a complex mixture derived from crude oil, traditional single-base asphalt is extremely sensitive to environmental stress and is easily affected by multiple factors such as thermal aging (high temperature leading to the volatilization and oxidation of light components), photo-aging (ultraviolet light triggering photo-oxidation reaction), and the more severe photo-thermal coupling aging. During use, it suffers from problems such as easy flow at high temperatures, easy cracking at low temperatures, and poor ductility, resulting in a short effective period. These limitations greatly restrict the application of traditional asphalt in high-end, long-lasting waterproofing projects.

[0003] To address the aforementioned technical problems, waterproof asphalt technology has evolved from a single material system to a high-performance material system with multi-component composite modification and integrated functions. Modern modified asphalt technology essentially optimizes the colloidal structure and temperature sensitivity of traditional asphalt by introducing various copolymers, polymer powders, polypropylene, and other polymeric materials and functional fillers as modifiers into the traditional asphalt matrix. Chinese patent CN 107177210A discloses a polyurethane-modified asphalt and its preparation method, made from the following raw materials in parts by weight: 5-15 parts asphalt, 0.55-1.65 parts prepolymer, 0.055-0.165 parts chain extender, and 0.1-0.3 parts compatibilizer. The polyurethane-modified asphalt of this invention utilizes polyurethane prepolymer to modify ordinary asphalt, and the addition of suitable admixtures effectively improves the compatibility of the modified asphalt. The resulting polyurethane-modified asphalt possesses good compatibility and low-temperature performance, meeting the requirements for road surface use in high-altitude and low-temperature environments and extending the service life of roads. However, this invention requires the addition of a compatibilizer to ensure the compatibility of polyurethane and asphalt. The addition of the compatibilizer not only requires additional processes and costs, but may also cause problems such as volatilization when faced with temperature changes, affecting stability and harming health.

[0004] Therefore, there is an urgent need for a new type of asphalt waterproofing material that incorporates functionally enhanced modifiers to improve and ensure the low-temperature flexibility and aging resistance of asphalt. Summary of the Invention

[0005] To address the existing technical problems, the present invention aims to provide a novel asphalt waterproofing material, its preparation method, and its application. This novel asphalt waterproofing material can be used in waterproof membrane and waterproof coating systems, exhibiting excellent low-temperature flexibility and high aging resistance.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The present invention provides a novel asphalt waterproofing material, which, by mass ratio of 100%, comprises the following raw materials: 50-70% base asphalt, 2-3% low-temperature resistant modifier, 0.5-1% compatibilizer, and 0.01-0.03% catalyst, with the balance being solvent.

[0007] In some embodiments of the present invention, the base asphalt is 70# petroleum asphalt and / or 90# petroleum asphalt.

[0008] In some embodiments of the present invention, the preparation steps of the low-temperature resistant modifier are as follows: (1) Mix trimethylolethane and n-butanol aqueous solution, then add epoxidized soybean oil and mix until uniform. Heat to 90~100℃ and react for 5~5.5h. After separation, washing and rotary evaporation, the modified polyol is obtained. (2) The modified polyol from step (1) is dehydrated and dried, then isocyanate is added and stirred evenly. The temperature is raised to 80~85℃ and reacted for 2~3 hours to obtain a prepolymer. Then it is mixed with bisphenol S to obtain a low-temperature resistant modifier.

[0009] Preferably, the isocyanate in step (2) is diphenylmethane diisocyanate and / or isophorone diisocyanate.

[0010] In some embodiments of the present invention, the mass ratio of trimethylol ethane and epoxidized soybean oil in step (1) is (0.1~0.3):1.

[0011] In some embodiments of the present invention, the mass ratio of the modified polyol and isocyanate in step (2) is 1:(1.5~2).

[0012] In some embodiments of the present invention, the mass ratio of the modified polyol and bisphenol S in step (2) is 1:(0.06~0.1).

[0013] This invention prepares a modified polyol from trimethylolethane and epoxidized soybean oil through a ring-opening reaction, which is then reacted with isocyanate to obtain a prepolymer. Simultaneously, bisphenol S is preferentially blended to obtain a low-temperature resistant modifier, effectively regulating the regularity of the molecular chain arrangement of the low-temperature resistant modifier. When the low-temperature resistant modifier is applied to prepare novel asphalt waterproof materials, it significantly improves the flexibility of the system. Furthermore, the applicant has discovered that the prepolymer in the modifier preferentially forms long chains with bisphenol S, and the low-temperature resistant modifier further reacts with the base asphalt, extending and lengthening the molecular chains of the base asphalt. These multiple effects are more conducive to the construction of the polyurethane network structure and the improvement of network strength, thus enhancing aging resistance. On the other hand, the generated long molecular chains have good compatibility with the base asphalt and also play a certain role in promoting compatibility, thereby enhancing the overall performance of the novel asphalt waterproof material. At the same time, the presence of the benzene ring further enhances the polarity and provides a certain degree of steric hindrance, thereby reducing the breaking temperature of the chemical bonds generated during the preparation of the novel asphalt waterproof material, and improving the low-temperature resistance of the novel asphalt waterproof material.

[0014] In some embodiments of the present invention, the compatibilizer is maleic anhydride or isocyanate type compatibilizer.

[0015] In some embodiments of the present invention, the catalyst is one or more of pyridine, organic bismuth and dibutyltin dilaurate.

[0016] In some embodiments of the present invention, the solvent is rubber oil and / or furfural oil.

[0017] In another aspect, the present invention provides a method for preparing a novel asphalt waterproofing material, comprising the following steps: The low-temperature resistant modifier and solvent are mixed until uniform, and the base asphalt and compatibilizer heated to a molten state are added. Then, a catalyst is added, and the mixture is subjected to high-temperature shearing and stirring to obtain the novel asphalt waterproof material.

[0018] Preferably, the high-temperature shearing conditions are: shearing at 170~200℃ and 2000~3000r / min for 30~60min, followed by constant temperature shearing at 3000~6000r / min for 30~40min.

[0019] Preferably, the stirring conditions are 150~160℃ and 300~600r / min for 1~2h.

[0020] In another aspect, the present invention provides the application of the novel bitumen waterproofing material obtained by the above technical solution in the field of waterproof membranes or waterproof coatings.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The novel asphalt waterproofing material of the present invention can be used in waterproof membrane and waterproof coating systems, with good low-temperature flexibility and high aging stability.

[0022] (2) In this invention, a modified polyol is prepared by ring-opening reaction of trimethylolethane and epoxidized soybean oil, and then reacted with isocyanate to obtain a prepolymer. At the same time, bisphenol S is preferred to be blended to obtain a low-temperature resistant modifier, which effectively adjusts the regularity of the molecular chain arrangement of the low-temperature resistant modifier. When the low-temperature resistant modifier is used to prepare a new type of asphalt waterproof material, the flexibility of the system is significantly improved.

[0023] (3) The low-temperature resistant modifier provided by the present invention further reacts with the base asphalt to extend and lengthen the molecular chain of the base asphalt. Under multiple effects, it is more conducive to the construction of polyurethane network structure and the improvement of network strength, thereby improving its aging resistance. Moreover, the generated long molecular chain has good compatibility with the base asphalt and also plays a certain role in promoting compatibility.

[0024] (4) The low-temperature resistant modifier of the present invention also improves the low-temperature resistance of the new asphalt waterproof material by reducing the breaking temperature of the chemical bonds generated during the preparation of the new asphalt waterproof material. Detailed Implementation

[0025] Various exemplary embodiments of the present invention are now described in detail. This detailed description should not be considered as a limitation of the invention, but rather as a more detailed description of certain aspects, features, and embodiments of the invention. It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, regarding numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, is also included in the invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0026] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of the invention. Various modifications and variations to the specific embodiments described in this specification are apparent to those skilled in the art without departing from the scope or spirit of the invention. Other embodiments derived from this specification will be apparent to those skilled in the art. This application specification and embodiments are merely exemplary.

[0027] A novel asphalt waterproofing material is prepared according to the proportions and preparation methods of the raw materials specified in the following specific embodiments.

[0028] To facilitate the implementation of this invention by those skilled in the art, the raw materials used in the following specific embodiments can all be purchased from the market unless otherwise specified.

[0029] To facilitate the implementation of this invention by those skilled in the art, the post-processing steps such as "separation," "washing," "rotary evaporation," and "dehydration and drying" used in the following specific embodiments are conventional operations for those skilled in the art, and can be selected according to actual operations.

[0030] Preparation Example 1 The preparation steps of the low-temperature resistant modifier are as follows: (1) Mix 10g of trimethylolethane and 50mL of 70wt% n-butanol aqueous solution, then add 50g of epoxidized soybean oil and mix until uniform. Heat to 95℃ and react for 5.2h. After separation, washing and rotary evaporation, the modified polyol is obtained. (2) 30g of the modified polyol from step (1) was dehydrated and dried, and then 51g of diphenylmethane diisocyanate was added and stirred evenly. The temperature was raised to 82℃ and reacted for 2.5h to obtain a prepolymer. Then, it was mixed with 2.4g of bisphenol S to obtain a low-temperature resistant modifier.

[0031] Preparation Example 2 The specific preparation steps of the low-temperature resistant modifier are the same as those in Preparation Example 1, except that the amount of trimethylol ethane added in step (1) is 4g.

[0032] Preparation Example 3 The specific preparation steps of the low-temperature resistant modifier are the same as those in Preparation Example 1, except that the amount of bisphenol S added in step (2) is 3.6g.

[0033] Preparation Example 4 The preparation steps of the low-temperature resistant modifier are as follows: 30g of polyethylene glycol (PEG600) was dehydrated and dried, then 51g of diphenylmethane diisocyanate was added and stirred evenly. The mixture was heated to 82℃ and reacted for 2.5h to obtain a prepolymer. Then, it was mixed with 2.4g of bisphenol S to obtain a low-temperature resistant modifier.

[0034] Example 1 A novel asphalt waterproofing material, by mass ratio of 100%, comprises the following raw materials: 60% 70# petroleum asphalt, 2.5% low-temperature resistant modifier, 0.8% maleic anhydride, and 0.02% dibutyltin dilaurate, with the balance being rubber oil.

[0035] The preparation method of the novel asphalt waterproofing material in this embodiment includes the following steps: The low-temperature resistant modifier and rubber oil are mixed evenly, and then 70# petroleum asphalt and maleic anhydride heated to a molten state are added. Dibutyltin dilaurate is then added, and the mixture is subjected to high-temperature shearing and stirring to obtain the novel asphalt waterproof material.

[0036] The high-temperature shearing conditions used were all 190℃, 2500r / min for 45min, followed by constant temperature shearing at 5000r / min for 35min; the stirring conditions used were all 155℃, 450r / min for 1.5h.

[0037] The low-temperature resistant modifier used in this embodiment was obtained from Preparation Example 1.

[0038] Example 2 A novel asphalt waterproofing material, by mass ratio of 100%, comprises the following raw materials: 50% 70# petroleum asphalt, 2% low-temperature resistant modifier, 0.5% maleic anhydride, and 0.01% dibutyltin dilaurate, with the balance being rubber oil.

[0039] The preparation method of the novel asphalt waterproofing material in this embodiment includes the following steps: The low-temperature resistant modifier and rubber oil are mixed evenly, and then 70# petroleum asphalt and maleic anhydride heated to a molten state are added. Dibutyltin dilaurate is then added, and the mixture is subjected to high-temperature shearing and stirring to obtain the novel asphalt waterproof material.

[0040] The high-temperature shearing conditions used were all 170℃, 3000r / min for 30min, followed by constant temperature shearing at 6000r / min for 30min; the stirring conditions used were all 150℃, 600r / min for 1h.

[0041] The low-temperature resistant modified polyurethane used in this embodiment was obtained from Preparation Example 1.

[0042] Example 3 A novel asphalt waterproofing material, by mass ratio of 100%, comprises the following raw materials: 70% 70# petroleum asphalt, 3% low-temperature resistant modifier, 1% maleic anhydride, and 0.03% dibutyltin dilaurate, with the remainder being rubber oil.

[0043] The preparation method of the novel asphalt waterproofing material in this embodiment includes the following steps: The low-temperature resistant modifier and rubber oil are mixed evenly, and then 70# petroleum asphalt and maleic anhydride heated to a molten state are added. Dibutyltin dilaurate is then added, and the mixture is subjected to high-temperature shearing and stirring to obtain the novel asphalt waterproof material.

[0044] The high-temperature shearing conditions used were all 200℃, 2000r / min for 60min, followed by constant temperature shearing at 3000r / min for 40min; the stirring conditions used were all 160℃, 300r / min for 2h.

[0045] The low-temperature resistant modifier used in this embodiment was obtained from Preparation Example 1.

[0046] Example 4 A novel asphalt waterproofing material and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that the low-temperature resistant modifier used in this example is obtained from Preparation Example 2.

[0047] Example 5 A novel asphalt waterproofing material and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that the low-temperature resistant modifier used in this example is obtained from Preparation Example 3.

[0048] Example 6 A novel asphalt waterproofing material and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that the low-temperature resistant modifier used in this example is obtained from Preparation Example 4.

[0049] Comparative Example 1 A novel asphalt waterproofing material and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that no low-temperature resistant modifier is added in this comparative example.

[0050] Performance testing: The novel bitumen waterproofing materials prepared in Examples 1-6 and Comparative Example 1 were used to prepare waterproof coatings and the following performance tests were conducted. The specific results are shown in Table 1.

[0051] Preparation steps of waterproof coating: By weight, mix 10 parts of new asphalt waterproof material, 3 parts of talc powder and 8 parts of rubber powder (60 mesh, purchased from Jiangsu Zhonghong Environmental Protection Technology Co., Ltd.), heat to 150℃, and shear at 3000r / min for 2h to obtain the coating.

[0052] (1) Low-temperature flexibility: Low-temperature flexibility is determined according to standard GB / T328.14-2007; (2) Aging stability: After measuring the low-temperature flexibility according to standard GB / T328.14-2007, the sample was placed in a thermal aging test chamber for thermal aging at 80℃ for 10 days. After obtaining the aged sample, it was placed at (23±2)℃ for 20 hours. Then, the low-temperature flexibility was tested according to (1), and the difference in low-temperature flexibility before and after aging was calculated to characterize the aging stability.

[0053] Table 1

[0054] As shown in Table 1, the novel bitumen waterproofing materials prepared in Examples 1-3 have superior low-temperature flexibility and aging resistance, which can meet the application requirements of waterproof membrane and waterproof coating systems.

[0055] As can be seen from the comparison between Example 4 and Example 1, the change in the amount of trimethylolethane added in step (1) during the preparation of the low-temperature modifier may affect the crosslinking density of the system. Although it increases the low-temperature flexibility to a certain extent, the aging resistance stability decreases significantly.

[0056] As can be seen from the comparison between Example 5 and Example 1, the amount of bisphenol S added in step (2) during the preparation of the low-temperature resistant modifier is changed. Due to the influence of the rigid and polar segments on the low-temperature resistant modifier, the low-temperature flexibility of the new asphalt waterproof material decreases.

[0057] A comparison of Example 6 and Example 1 shows that replacing the modified polyol with an equal amount of PEG600 in the preparation of the low-temperature resistant modifier had a significant impact on the aging resistance and stability of the new asphalt waterproofing material.

[0058] As can be seen from the comparison between Comparative Example 1 and Example 1, when no low-temperature modifier is added, the application performance of the new asphalt waterproof material in waterproof coatings is affected to varying degrees, especially the low-temperature flexibility is insufficient.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present application in any way. Although the present application discloses the preferred embodiment as described above, it is not intended to limit the present application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of the present application using the disclosed technical content are equivalent to equivalent implementation cases. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention are still within the scope of the technical solution.

Claims

1. A novel asphalt waterproofing material, characterized in that, The novel asphalt waterproofing material comprises the following raw materials in a 100% mass ratio: 50-70% base asphalt, 2-3% low-temperature resistant modifier, 0.5-1% compatibilizer, and 0.01-0.03% catalyst, with the remainder being solvent.

2. The novel asphalt waterproofing material according to claim 1, characterized in that, The base asphalt is 70# petroleum asphalt and / or 90# petroleum asphalt.

3. The novel asphalt waterproofing material according to claim 1, characterized in that, The preparation steps of the low-temperature resistant modifier are as follows: (1) Mix trimethylolethane and n-butanol aqueous solution, then add epoxidized soybean oil and mix until uniform. Heat to 90~100℃ and react for 5~5.5h. After separation, washing and rotary evaporation, the modified polyol is obtained. (2) The modified polyol from step (1) is dehydrated and dried, then isocyanate is added and stirred evenly. The temperature is raised to 80~85℃ and reacted for 2~3 hours to obtain a prepolymer. Then it is mixed with bisphenol S to obtain a low-temperature resistant modifier.

4. The novel asphalt waterproofing material according to claim 3, characterized in that, The mass ratio of trimethylol ethane and epoxidized soybean oil in step (1) is (0.1~0.3):

1.

5. A novel asphalt waterproofing material according to claim 3, characterized in that, The mass ratio of the modified polyol and isocyanate in step (2) is 1:(1.5~2).

6. The novel asphalt waterproofing material according to claim 3, characterized in that, The mass ratio of the modified polyol and bisphenol S in step (2) is 1: (0.06~0.1).

7. The novel asphalt waterproofing material according to claim 1, characterized in that, The catalyst is one or more of pyridine, organobismuth and dibutyltin dilaurate.

8. The novel asphalt waterproofing material according to claim 1, characterized in that, The solvent is rubber oil and / or furfural oil.

9. A method for preparing the novel asphalt waterproofing material according to any one of claims 1-8, characterized in that, It includes the following steps: The low-temperature resistant modifier and solvent are mixed until uniform, and the base asphalt and compatibilizer heated to a molten state are added. Then, a catalyst is added, and the mixture is subjected to high-temperature shearing and stirring to obtain the novel asphalt waterproof material.

10. The application of a novel bitumen waterproofing material according to any one of claims 1-8 or a novel bitumen waterproofing material obtained by the preparation method according to claim 9 in the field of waterproof membranes or waterproof coatings.

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