Polymer modified asphalt binder as well as preparation method and application thereof

Abstract

The invention provides a polymer modified asphalt binder as well as a preparation method and application thereof, and belongs to the technical field of road engineering materials. The polymer modified asphalt adhesive comprises the following raw material components in parts by mass: 40-60 parts of matrix asphalt, 4-9 parts of a polymer modifier, 10-20 parts of a polyurethane prepolymer, 0.5-2 parts of a reactive chain extender, 3-6 parts of a compatilizer and 0.1-1 part of a stabilizer. The preparation method comprises the following steps: heating matrix asphalt, adding a polymer modifier, and carrying out shearing dispersion to obtain a colloidal dispersion; cooling the colloidal dispersion, mixing the cooled colloidal dispersion with a polyurethane prepolymer, a chain extender and a compatilizer, and carrying out a grafting reaction to obtain a mixture; and mixing the mixture with a stabilizer to obtain the polymer modified asphalt binder. The polymer modified asphalt adhesive prepared by the invention has high cohesiveness of polyurethane and good weather resistance of emulsified asphalt, can resist erosion of water, ultraviolet rays and chemical corrosion, and remarkably improves the crack resistance, wear resistance and durability of a pavement seal.

Description

Technical Field

[0001] This invention relates to the field of road engineering materials technology, and in particular to a polymer-modified asphalt adhesive, its preparation method, and its application. Background Technology

[0002] Sand-based mist seal is a special material used for road maintenance. It is made of modified emulsified asphalt or coal tar pitch base material, clay, polymer additives, and sand. This material is evenly sprayed onto the asphalt pavement using a specialized high-pressure sprayer, forming a thin protective film. This protective film effectively prevents moisture from penetrating to the pavement surface, avoids pavement loosening, slows down the aging process of asphalt, and also improves its appearance.

[0003] However, currently widely used sand-containing fog seal coats mainly use ordinary asphalt, SBR modified asphalt, or SBS modified asphalt as the base material. These materials have some problems: insufficient bond strength between the aggregate and the base surface, and their wear resistance and durability have not reached ideal standards. These problems make it difficult for existing sand-containing fog seal coats to meet the actual needs of preventive maintenance of asphalt pavements on highways in my country. Summary of the Invention

[0004] The purpose of this invention is to provide a polymer-modified asphalt adhesive, its preparation method, and its application, in order to solve the problems of insufficient durability and abrasion resistance, and poor aggregate adhesion of existing sand-containing fog seal materials.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] This invention provides a polymer-modified asphalt adhesive, comprising the following raw materials in parts by weight: 40-60 parts of base asphalt, 4-9 parts of polymer modifier, 10-20 parts of polyurethane prepolymer, 0.5-2 parts of reactive chain extender, 3-6 parts of compatibilizer, and 0.1-1 parts of stabilizer.

[0007] The polymer modifier includes one or more of SBS and SBR latex;

[0008] The polyurethane prepolymer includes isocyanate-terminated prepolymer or isocyanate-terminated polybutadiene, wherein the isocyanate content in the polyurethane prepolymer is 4-10%.

[0009] Preferably, the base asphalt comprises 70# or 90# petroleum asphalt;

[0010] The reactive chain extender includes amine chain extenders or alcohol chain extenders.

[0011] Preferably, the compatibilizer includes maleic anhydride, furfural extract oil, or a mixture of maleic anhydride and furfural extract oil, wherein the mass ratio of maleic anhydride to furfural extract oil in the mixture of maleic anhydride and furfural extract oil is 1:1 to 1.5.

[0012] The stabilizer includes one or more of sulfur and siloxane polymers.

[0013] Preferably, the amine chain extender includes ethylenediamine, diethylenetriamine, or triethylenetetramine;

[0014] The alcohol chain extender includes 1,4-butanediol or neopentyl glycol.

[0015] Preferably, the siloxane polymer includes polydimethylsiloxane or tetramethyltetraphenyltrisiloxane.

[0016] This invention provides a method for preparing a polymer-modified asphalt adhesive, comprising the following steps:

[0017] After heating the base asphalt, a polymer modifier is added, and shear dispersion is performed to obtain a colloidal dispersion.

[0018] After cooling the colloidal dispersion, it is mixed with polyurethane prepolymer, reactive chain extender and compatibilizer, and grafting reaction is carried out to obtain a mixture.

[0019] The mixture is then combined with a stabilizer to obtain a polymer-modified asphalt adhesive.

[0020] Preferably, the temperature of the heated matrix asphalt is 150–180°C;

[0021] When the polymer modifier is SBS, the rotation speed of the shear dispersion is 4000-5500 rpm;

[0022] When the polymer modifier is SBR latex, the rotation speed of the shear dispersion is 2000-3000 rpm;

[0023] The shear dispersion time is 30–60 min.

[0024] Preferably, the temperature of the cooled colloidal dispersion is 110–130°C;

[0025] The grafting reaction was carried out at a stirring speed of 150–200 rpm, a temperature of 100–125 °C, and a time of 20–40 min.

[0026] This invention provides the application of the above-mentioned polymer-modified asphalt adhesive or the polymer-modified asphalt adhesive prepared by the above-mentioned preparation method in sand-containing fog seal composite materials, wherein the sand-containing fog seal composite material comprises the following raw material components in parts by weight: 100 parts of polymer-modified asphalt adhesive, 30-50 parts of anti-skid aggregate, and 5-20 parts of water.

[0027] The polymer-modified asphalt adhesive is the polymer-modified asphalt adhesive described above or the polymer-modified asphalt adhesive prepared by the above preparation method.

[0028] Preferably, the anti-slip aggregate includes one or more of corundum, basalt sand, perlite sand, ceramic particles, and quartz sand; based on the total mass content of the anti-slip aggregate as 100%, the anti-slip aggregate includes 0-10% anti-slip aggregate with a particle size of 15-30 mesh, 80-90% anti-slip aggregate with a particle size of 30-80 mesh, and 0-10% anti-slip aggregate with a particle size of 80-100 mesh.

[0029] The beneficial effects of this invention are:

[0030] The raw materials for this polymer-modified asphalt adhesive include base asphalt, polymer modifier, polyurethane prepolymer, reactive chain extender, compatibilizer, and stabilizer. The polymer modifier includes one or more of SBS and SBR latex. In the asphalt system, SBS forms a continuous three-dimensional network through swelling, delaying the diffusion of aging components in the asphalt and increasing the ductility retention rate after aging by 15-20%, significantly improving the durability of the asphalt adhesive. SBR is a styrene-butadiene rubber latex with high molecular chain flexibility, which not only inhibits low-temperature cracking but also improves the material's adhesion to aggregates. Furthermore, the small particle size (0.1-1 μm) of the latex particles allows it to fill aggregate micropores, enhancing initial adhesion. SBR can also act as a water-based dispersion, improving asphalt-water interface compatibility and emulsification stability, thereby enhancing the material's durability. When SBS modifier and SBR latex are used in combination, both of these effects can be achieved simultaneously. Polyurethane prepolymers contain free -NCO groups, which can react with active hydrogen in asphalt (such as carboxyl groups -COOH and hydroxyl groups -OH) and amino groups in SBS / SBR to form a chemically cross-linked structure, increasing cohesive strength and thus improving wear resistance. The use of reactive chain extenders can improve the durability of the finished product, combining chain extension and cross-linking functions; the use of compatibilizers can improve compatibility with asphalt and thermal stability. Stabilizers can promote the cross-linking stability of compounded polyurethane or modified asphalt, improving heat resistance.

[0031] The polymer-modified asphalt adhesive prepared by this invention combines the high adhesion and flexibility of polyurethane with the good weather resistance of emulsified asphalt. It can resist the erosion of various factors such as water, ultraviolet rays and chemical corrosion, and significantly improve the crack resistance, wear resistance and durability of the road seal. Detailed Implementation

[0032] This invention provides a polymer-modified asphalt adhesive, comprising the following raw materials in parts by weight: 40-60 parts of base asphalt, 4-9 parts of polymer modifier, 10-20 parts of polyurethane prepolymer, 0.5-2 parts of reactive chain extender, 3-6 parts of compatibilizer, and 0.1-1 parts of stabilizer.

[0033] The polymer modifier includes one or more of SBS and SBR latex;

[0034] The polyurethane prepolymer includes isocyanate-terminated prepolymer or isocyanate-terminated polybutadiene, wherein the isocyanate content in the polyurethane prepolymer is 4-10%.

[0035] In this invention, unless otherwise specified, all raw materials required for preparation are commercially available products well known to those skilled in the art.

[0036] In the polymer-modified asphalt adhesive of the present invention, the base asphalt preferably includes 70# or 90# petroleum asphalt, and more preferably 70# petroleum asphalt.

[0037] In this invention, the mass fraction of the base asphalt is preferably 40 to 60 parts, and more preferably 50 to 55 parts.

[0038] In the polymer-modified asphalt adhesive of the present invention, the polymer modifier preferably includes one or more of SBS and SBR latex, wherein the SBS is a styrene-butadiene-styrene block copolymer, the SBS preferably includes linear SBS or star-shaped SBS, the SBR is styrene-butadiene rubber latex, and the solid content of the SBR latex is preferably 50-60%, more preferably 60%. The present invention does not specifically limit the source of the polymer modifier. In the examples, the linear SBS is preferably YH-792 and YH-791, with a molecular weight of 90,000-110,000, and the manufacturer is Baling Petrochemical Branch of China Petrochemical Corporation. In the examples, the star-shaped SBS is preferably YH-4306, and the manufacturer is Baling Petrochemical Branch of China Petrochemical Corporation. In the examples, the SBR latex is purchased from BASF AG.

[0039] In this invention, the polymer modifier is preferably 4 to 9 parts by mass, more preferably 6 to 8 parts, and even more preferably 7 parts.

[0040] In the polymer-modified asphalt adhesive of the present invention, the polyurethane prepolymer preferably comprises an isocyanate-terminated prepolymer or an isocyanate-terminated polybutadiene. The isocyanate-terminated prepolymer is BASF ELASTOCASTCC 6085 / 102 / A90 ISO isocyanate prepolymer, and the isocyanate-terminated polybutadiene is purchased from Tianyuan Aviation Materials (Yingkou) Technology Co., Ltd. The isocyanate content (NCO content) in the polyurethane prepolymer is preferably 4-10%, more preferably 6-8%.

[0041] In this invention, the mass fraction of the polyurethane prepolymer is preferably 10 to 20 parts, more preferably 12 to 18 parts, and even more preferably 15 parts.

[0042] In the polymer-modified asphalt adhesive of the present invention, the reactive chain extender preferably includes an amine chain extender or an alcohol chain extender. The amine chain extender preferably includes ethylenediamine, diethylenetriamine, or triethylenetetramine, and more preferably diethylenetriamine. The alcohol chain extender preferably includes 1,4-butanediol or neopentyl glycol, and more preferably neopentyl glycol.

[0043] In this invention, the reactive chain extender is preferably 0.5 to 2 parts by mass, more preferably 0.8 to 1.5 parts by mass, and even more preferably 1.2 parts by mass.

[0044] In the polymer-modified asphalt adhesive of the present invention, the compatibilizer preferably includes maleic anhydride, furfural extract oil, or a mixture of maleic anhydride and furfural extract oil, more preferably maleic anhydride; wherein the mass ratio of maleic anhydride to furfural extract oil in the mixture of maleic anhydride and furfural extract oil is preferably 1:1 to 1.5, more preferably 1:1 to 1.3.

[0045] In this invention, the compatibilizer is preferably 4 to 6 parts by mass, and more preferably 5 to 6 parts by mass.

[0046] In the polymer-modified asphalt adhesive of the present invention, the stabilizer preferably includes one or more of sulfur and siloxane polymers, wherein the siloxane polymer preferably includes polydimethylsiloxane or tetramethyltetraphenyltrisiloxane, wherein the tetramethyltetraphenyltrisiloxane is preferably Dow Chemical's DC-704.

[0047] In this invention, the stabilizer is preferably 0.1 to 1 part by mass, and more preferably 0.3 to 0.5 parts by mass.

[0048] This invention provides a method for preparing a polymer-modified asphalt adhesive, comprising the following steps:

[0049] After heating the base asphalt, a polymer modifier is added, and shear dispersion is performed to obtain a colloidal dispersion.

[0050] After cooling the colloidal dispersion, it is mixed with polyurethane prepolymer, reactive chain extender and compatibilizer, and grafting reaction is carried out to obtain a mixture.

[0051] The mixture is then combined with a stabilizer to obtain a polymer-modified asphalt adhesive.

[0052] The present invention preferably involves heating and melting the base asphalt, maintaining temperature uniformity through a heat transfer oil circulation system to avoid local overheating and asphalt aging, and then adding a polymer modifier in a shearing machine for shearing and dispersion. Viscosity changes are monitored during the shearing process until a uniform gel-like dispersion is formed.

[0053] In this invention, the temperature of the heated matrix asphalt is preferably 150-180°C, more preferably 160-170°C, and even more preferably 165°C.

[0054] In this invention, when the polymer modifier is SBS, the preferred rotation speed for shear dispersion is 4000-5500 rpm, more preferably 4000 rpm, which ensures that the SBS particles are fully swollen and broken down; when the polymer modifier is SBR latex, the preferred rotation speed for shear dispersion is 2000-3000 rpm, more preferably 2500 rpm, which avoids demulsification; the preferred shear dispersion time is 30-60 min, more preferably 30-45 min.

[0055] In this invention, the above-mentioned colloidal dispersion is cooled down, nitrogen gas is introduced, and the cooled colloidal dispersion is mixed with polyurethane prepolymer, reactive chain extender and compatibilizer. Grafting reaction is carried out under low speed stirring to obtain a mixture. Nitrogen gas is introduced to prevent isocyanate groups from reacting with water vapor.

[0056] In this invention, the temperature of the cooled colloidal dispersion is preferably 110-130°C, and more preferably 120-130°C.

[0057] In this invention, the stirring speed of the grafting reaction is preferably 150-200 rpm, more preferably 180-200 rpm, and the time is preferably 20-40 min, more preferably 25-30 min.

[0058] The present invention preferably mixes the mixture with a stabilizer and cools the resulting product using a water-cooling cycle to obtain a polymer-modified asphalt adhesive; the crosslinking effect of sulfur can improve the interfacial stability between the polymer modifier and the polyurethane phase, and the siloxane polymer stabilizes the polyurethane phase through steric hindrance.

[0059] In this invention, the mixing speed is preferably 200-400 rpm, more preferably 200 rpm; the mixing time is preferably 15 min.

[0060] In this invention, the temperature of the cooled product is preferably <80°C, and more preferably <70°C.

[0061] This invention provides the application of the above-mentioned polymer-modified asphalt adhesive or the polymer-modified asphalt adhesive prepared by the above-mentioned preparation method in sand-containing fog seal composite materials, wherein the sand-containing fog seal composite material comprises the following raw material components in parts by weight: 100 parts of polymer-modified asphalt adhesive, 30-50 parts of anti-skid aggregate, and 5-20 parts of water.

[0062] The polymer-modified asphalt adhesive is the polymer-modified asphalt adhesive described above or the polymer-modified asphalt adhesive prepared by the above preparation method.

[0063] The anti-slip aggregate includes one or more of the following: corundum, basalt sand, perlite sand, ceramic particles, and quartz sand.

[0064] In the sand-containing fog sealing composite material provided by the present invention, the mass fraction of the anti-slip aggregate is preferably 30 to 50 parts, and more preferably 40 to 45 parts.

[0065] In this invention, the anti-slip aggregate preferably includes one or more of corundum, basalt sand, perlite sand, ceramic particles and quartz sand, and more preferably one or more of corundum, basalt sand and ceramic particles; when there are multiple anti-slip aggregates, this invention does not have a special limitation on the proportion between the anti-slip aggregates.

[0066] In this invention, taking the total mass content of the anti-slip aggregate as 100%, the anti-slip aggregate preferably includes 0-10% anti-slip aggregate with a particle size of 15-30 mesh, 80-90% anti-slip aggregate with a particle size of 30-80 mesh, and 0-10% anti-slip aggregate with a particle size of 80-100 mesh. More preferably, it includes 5-8% anti-slip aggregate with a particle size of 15-30 mesh, 85-88% anti-slip aggregate with a particle size of 30-80 mesh, and 7% anti-slip aggregate with a particle size of 80-100 mesh.

[0067] In the sand-containing fog sealing composite material provided by the present invention, the water content is preferably 5 to 20 parts by mass, more preferably 8 to 15 parts, and even more preferably 12 parts.

[0068] In this invention, the preferred method for preparing the sand-containing fog seal composite material includes the following steps: mixing polymer-modified asphalt adhesive, anti-skid aggregate and water, and stirring at a speed of 850 r / min to obtain the sand-containing fog seal composite material.

[0069] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0070] In the examples, YH-792 and YH-4306 were purchased from Baling Petrochemical Branch of China Petrochemical Corporation, SBR latex was purchased from BASF AG, and the terminal isocyanate prepolymer was BASF AG's ELASTOCAST CC 6085 / 102 / A90 ISO isocyanate prepolymer.

[0071] Example 1

[0072] The raw material components of the polymer-modified asphalt adhesive provided in this embodiment are as follows:

[0073] 50 parts of 70# petroleum asphalt, 26 parts of YH-792, 15 parts of terminal isocyanate prepolymer (NCO content 8%), 1.2 parts of diethylenetriamine, 4 parts of maleic anhydride, and 0.3 parts of sulfur.

[0074] 70# petroleum asphalt was heated to 160℃ (±5℃) to melt, and then YH-792 was added to a shearing machine for shearing dispersion at a speed of 4000 rpm for 45 minutes to form a uniform colloidal dispersion.

[0075] The colloidal dispersion was cooled to 120°C, nitrogen gas was introduced, and polyurethane prepolymer, diethylenetriamine and maleic anhydride were added. Grafting reaction was carried out at 200 rpm for 40 min to obtain a mixture.

[0076] The mixture was combined with sulfur powder and stirred at 400 rpm for 15 min. The product was then cooled to below 70°C using a water-cooling circulation system to obtain a polymer-modified asphalt adhesive.

[0077] Example 2

[0078] The raw material components of the polymer-modified asphalt adhesive provided in this embodiment are as follows:

[0079] 50 parts of 90# petroleum asphalt, 8 parts of SBR latex (60% solid content), 18 parts of terminal isocyanate prepolymer (6% NCO content), 1.5 parts of 1,4-butanediol, 5 parts of maleic anhydride, and 0.5 parts of polydimethylsiloxane.

[0080] Heat 90# asphalt to 165℃, slowly add SBR latex, and simultaneously shear and disperse at a speed of 2500 rpm to avoid latex breakage. The time is 45 minutes to obtain a colloidal dispersion.

[0081] The colloidal dispersion was cooled to 110°C, nitrogen gas was introduced, and polyurethane prepolymer, 1,4-butanediol and maleic anhydride were added. The grafting reaction was carried out under low-speed stirring at 180 rpm for 30 min to obtain a mixture.

[0082] The mixture was combined with polydimethylsiloxane and stirred at 200 rpm for 15 min. The product was then cooled to below 70°C using a water-cooling cycle to obtain a polymer-modified asphalt adhesive.

[0083] Example 3

[0084] The raw material components of the polymer-modified asphalt adhesive provided in this embodiment are as follows:

[0085] 55 parts of 70# petroleum asphalt, 64 parts of YH-430, 3 parts of SBR latex (50% solid content), 12 parts of terminal isocyanate prepolymer (10% NCO content), 0.8 parts of neopentyl glycol, 6 parts of maleic anhydride, 0.2 parts of sulfur, and 0.3 parts of polydimethylsiloxane.

[0086] Heat 70# asphalt to 170℃, add YH-4306 to a shearing machine for shearing dispersion at 4000 rpm for 30 min, then add SBR latex and shear and stir at 2500 rpm for 15 min to obtain a colloidal dispersion.

[0087] The colloidal dispersion was cooled to 110°C, nitrogen gas was introduced, maleic anhydride was added and stirring was continued for 2 minutes. The mixture was then transferred to a secondary reactor, where polyurethane prepolymer and neopentyl glycol were added. The grafting reaction was carried out under low-speed stirring at 200 rpm, 125°C, and 25 minutes to obtain a mixture.

[0088] The mixture was first mixed with sulfur powder, then with polydimethylsiloxane, and the product was cooled to below 70°C using a water-cooling cycle to obtain the polymer-modified asphalt adhesive.

[0089] Comparative Example 1

[0090] The difference from Example 1 is that no terminal isocyanate prepolymer was added; specifically:

[0091] The raw material components of the polymer-modified asphalt binder provided in this comparative example are:

[0092] 50 parts of 70# petroleum asphalt, YH-792, 1 part of diethylenetriamine, 5 parts of maleic anhydride, and 0.3 parts of sulfur;

[0093] Heat 70# petroleum asphalt to 165℃ to melt it, start shearing at 4000 rpm and add YH-792 for 45 minutes to form a uniform colloidal dispersion;

[0094] The colloidal dispersion was cooled to 120°C, and diethylenetriamine and maleic anhydride were added. The grafting reaction was carried out at 200 rpm for 40 min to obtain a mixture.

[0095] The mixture was combined with sulfur powder and stirred at 400 rpm for 15 min. The product was then cooled to below 70°C using a water-cooling circulation system to obtain a polymer-modified asphalt adhesive.

[0096] Comparative Example 2

[0097] The difference from Example 2 is that EVA (ethylene-vinyl acetate copolymer) is used instead of the SBR latex in Example 2; specifically:

[0098] The raw material composition of the polymer-modified asphalt adhesive provided in this comparative example is as follows: 50 parts of 90# petroleum asphalt, 8 parts of EVA resin (VA content 28%) used to replace SBR latex, 18 parts of terminal isocyanate prepolymer (NCO content 6%), 1.5 parts of 1,4-butanediol as chain extender, 5 parts of maleic anhydride, and 0.5 parts of polydimethylsiloxane.

[0099] 90# asphalt was heated to 175℃±5℃ (10℃ higher than in Example 2), EVA resin was added, and the mixture was sheared at 2000 rpm for 60 min (15 min longer than in Example 2) to form a uniform dispersion.

[0100] The above dispersion was cooled to 110°C, nitrogen gas was introduced, and polyurethane prepolymer, 1,4-butanediol and maleic anhydride were added. The grafting reaction was carried out by stirring at 500 rpm for 30 min to obtain a mixture.

[0101] The mixture was combined with polydimethylsiloxane and stirred at 200 rpm for 15 min. The product was then cooled to below 70°C using a water-cooling cycle to obtain a polymer-modified asphalt adhesive.

[0102] The emulsified asphalt ductility retention rates of Comparative Example 2 and Example 2 were tested according to the JTG E20 T0651 evaporation residue preparation, JTG E20 T0610 film heating aging, and JTG E20T0605 ductility test. The results showed that the ductility retention rate of Comparative Example 2 after aging was 67%, which was less than the 84% ductility retention rate of Example 2 after aging. This proves that the use of polymer modifier in this invention improves the anti-aging ability of the product.

[0103] Application Example 1

[0104] By weight, 100 parts of the polymer-modified bitumen adhesive prepared in Example 1 and Comparative Example 1, 30 parts of quartz sand and 15 parts of water were mixed and stirred thoroughly at a stirring speed of 850 r / min to obtain a sand-containing mist seal composite material suitable for atomized spraying.

[0105] The fog seal material exhibited excellent performance after testing: wet wheel abrasion tests were conducted in a water bath for 1 hour according to test method JTG E20-2011T0752. The results showed that the abrasion value of the fog seal material prepared by the polymer-modified asphalt binder in Example 1 was 86 g / m². 2 The wet wheel abrasion performance of the fog seal material made from the polymer-modified asphalt binder in Comparative Example 1 was 224 g / m. 2 This demonstrates that the polyurethane prepolymer used in this invention improves abrasion resistance. According to the test method in T / CHTS10037—2021, the fog seal material prepared by the polymer-modified asphalt adhesive of Example 1 was uniformly spread on the asphalt pavement using a high-pressure spraying device (pressure 0.4–0.6 MPa), with a thickness controlled at 1–1.5 mm. The BPN was tested using a pendulum friction meter after 15 days. 20 ≥68. Furthermore, the pull-out strength of the fog seal material made from the polymer-modified asphalt binder of Example 1, measured at 25°C, reached 1.71 MPa.

[0106] Application Example 2

[0107] By weight, 100 parts of the polymer-modified asphalt binder prepared in Example 2 and 40 parts of anti-skid aggregate were mixed. The anti-skid aggregate used was a mixture of quartz sand and basalt sand in a mass ratio of 1:1. Based on the total mass content of the anti-skid aggregate as 100%, it included 5% anti-skid aggregate with a particle size distribution of 15-30 mesh, 88% anti-skid aggregate with a particle size distribution of 30-80 mesh, and 7% anti-skid aggregate with a particle size distribution of 80-100 mesh. The mixture was mechanically stirred at 200 rpm for 10 minutes to ensure that the aggregate completely coated the asphalt. A total of 12 parts of water were added in 3 batches to obtain the sand-containing fog seal composite material.

[0108] Laboratory testing showed that the wet wheel abrasion test of this fog seal material resulted in an abrasion value of 78 g / m. 2 The asphalt pavement was evenly spread using high-pressure spraying equipment (pressure 0.4–0.6 MPa), with a thickness controlled at 1–1.5 mm. The BPN (bipolar dynamic range) was tested using a pendulum friction meter after 15 days. 20 ≥70, with a pull-out strength of ≥1.64MPa from the asphalt pavement substrate.

[0109] Application Example 3

[0110] By weight, 100 parts of the polymer-modified material prepared in Example 3 and 45 parts of anti-skid aggregate were mixed in batches. The anti-skid aggregate contained quartz sand and ceramic particles in a 3:1 ratio. Based on the total mass content of the anti-skid aggregate as 100%, it included 8% anti-skid aggregate with a particle size distribution of 15-30 mesh, 85% anti-skid aggregate with a particle size distribution of 30-80 mesh, and 7% anti-skid aggregate with a particle size distribution of 80-100 mesh. The mixture was mechanically stirred at 600 rpm for 15 minutes to fully impregnate the aggregate surface with asphalt. A total of 8 parts of an aqueous solution containing 0.5% polycarboxylate dispersant were added in two batches to adjust the viscosity to the working viscosity (measured by a rotational viscometer as 1800±200 cP) to obtain the sand-containing fog seal mixture.

[0111] Laboratory testing showed that the wet wheel abrasion test of this fog seal material resulted in an abrasion value of 74 g / m. 2 The asphalt pavement was evenly spread using high-pressure spraying equipment (pressure 0.4–0.6 MPa), with a thickness controlled at 1–1.5 mm. The BPN (bipolar dynamic range) was tested using a pendulum friction meter after 15 days. 20 ≥78, with a pull-out strength of ≥1.77MPa from the asphalt pavement substrate.

[0112] Comparative Application Example 1

[0113] By weight, 100 parts of the polymer-modified asphalt binder prepared in Comparative Example 2 and 40 parts of sand were mixed. The sand was a 1:1 mixture of quartz sand and basalt sand, with the same mesh size requirement as in Application Example 2. The mixture was mechanically stirred at 200 rpm for 10 minutes to ensure that the aggregate completely coated the asphalt. 12 parts of water were added to obtain the sand-containing fog seal composite material.

[0114] Laboratory tests on the wet wheel abrasion of this fog seal material showed an abrasion value of 174 g / m. 2 The asphalt pavement was evenly spread using high-pressure spraying equipment, with a thickness controlled between 1 and 1.5 mm. The BPN (bipolar dynamic range) was measured using a pendulum friction meter after 15 days. 20 =60; the pull-out strength of the asphalt pavement is 0.7MPa.

[0115] Comparing Application Examples 1-3 with Comparative Application Example 1, it can be seen that the sand-containing mist seal composite material obtained in Comparative Application Example 1 is weaker in all aspects than that of Application Examples 1-3, proving the superiority of the raw materials in the formulation of this invention and effectively improving wear resistance and durability (BPN measured by pendulum friction tester after 15 days). 20 ) and high adhesion (pull-out strength).

[0116] Comprehensive evaluation shows that the above indicators are significantly different from the polymer-modified asphalt adhesive and its sand-containing fog seal material of the present invention, while the latter has improved the wear resistance performance to a relatively excellent level.

[0117] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A polymer-modified asphalt adhesive, characterized in that, The preparation raw materials include the following parts by weight: 40-60 parts of base bitumen, 4-9 parts of polymer modifier, 10-20 parts of polyurethane prepolymer, 0.5-2 parts of reactive chain extender, 3-6 parts of compatibilizer, and 0.1-1 parts of stabilizer. The polymer modifier includes one or more of SBS and SBR latex; The polyurethane prepolymer includes isocyanate-terminated prepolymer or isocyanate-terminated polybutadiene, wherein the isocyanate content in the polyurethane prepolymer is 4-10%.

2. The polymer-modified asphalt adhesive according to claim 1, characterized in that, The base asphalt includes 70# or 90# petroleum asphalt; The reactive chain extender includes amine chain extenders or alcohol chain extenders.

3. The polymer-modified asphalt adhesive according to claim 1, wherein the compatibilizer comprises maleic anhydride, furfural extract oil, or a mixture of maleic anhydride and furfural extract oil, wherein the mass ratio of maleic anhydride to furfural extract oil in the mixture of maleic anhydride and furfural extract oil is 1:1 to 1.

5. The stabilizer includes one or more of sulfur and siloxane polymers.

4. The polymer-modified bitumen adhesive according to claim 2, characterized in that, The amine chain extenders include ethylenediamine, diethylenetriamine, or triethylenetetramine; The alcohol chain extender includes 1,4-butanediol or neopentyl glycol.

5. The polymer-modified asphalt adhesive according to claim 3, characterized in that, The siloxane polymer includes polydimethylsiloxane or tetramethyltetraphenyltrisiloxane.

6. A method for preparing a polymer-modified asphalt adhesive, characterized in that, Includes the following steps: After heating the base asphalt, a polymer modifier is added, and shear dispersion is performed to obtain a colloidal dispersion. After cooling the colloidal dispersion, it is mixed with polyurethane prepolymer, reactive chain extender and compatibilizer, and grafting reaction is carried out to obtain a mixture. The mixture is then combined with a stabilizer to obtain a polymer-modified asphalt adhesive.

7. The preparation method according to claim 6, characterized in that, The temperature of the heated matrix asphalt is 150–180°C; When the polymer modifier is SBS, the rotation speed of the shear dispersion is 4000-5500 rpm; When the polymer modifier is SBR latex, the rotation speed of the shear dispersion is 2000-3000 rpm; The shear dispersion time is 30–60 min.

8. The preparation method according to claim 6, characterized in that, The temperature of the cooled colloidal dispersion is 110–130°C; The grafting reaction was carried out at a stirring speed of 150–200 rpm, a temperature of 100–125 °C, and a time of 20–40 min.

9. The application of the polymer-modified asphalt adhesive according to any one of claims 1 to 5 or the polymer-modified asphalt adhesive prepared by the preparation method according to any one of claims 6 to 8 in sand-containing fog seal composite materials, characterized in that, The sand-containing fog seal composite material comprises the following raw material components in parts by weight: 100 parts polymer-modified asphalt binder, 30-50 parts anti-skid aggregate, and 5-20 parts water. The polymer-modified asphalt adhesive is the polymer-modified asphalt adhesive according to any one of claims 1 to 5 or the polymer-modified asphalt adhesive prepared by the preparation method according to any one of claims 6 to 8.

10. The application according to claim 9, characterized in that, The anti-slip aggregate includes one or more of the following: corundum, basalt sand, perlite sand, ceramic particles, and quartz sand; based on the total mass content of the anti-slip aggregate as 100%, the anti-slip aggregate includes 0-10% anti-slip aggregate with a particle size of 15-30 mesh, 80-90% anti-slip aggregate with a particle size of 30-80 mesh, and 0-10% anti-slip aggregate with a particle size of 80-100 mesh.