A seal coat material and raw material composition, a preparation method and applications

Abstract

This invention discloses a sealing material, its raw material composition, preparation method, and application. The raw material composition of the sealing material comprises the following components in parts by weight: 30-60 parts anionic emulsified asphalt, 0-20 parts (but not 0 parts) aqueous polymer, 0.1-2.0 parts stabilizer, 1-5 parts asphalt recycling agent, and 30-50 parts aggregate. The sealing material of this invention has high viscosity, good stability (<2%), does not delaminate during storage, and exhibits good mechanical strength and abrasion resistance. When sprayed onto asphalt pavement, the sealing material results in a friction coefficient ≥65 BPN, a texture depth loss rate ≤10%, and a permeability coefficient ≤10 mL / min.

Description

TECHNICAL FIELD

[0001] The present application relates to a seal coat material and raw material composition, a preparation method and application. BACKGROUND

[0002] The race track surface is generally paved with asphalt concrete at home and abroad. After a period of operation, the race track will have slight diseases such as surface polishing of coarse particles, loss of asphalt film, and scattering of surface fine aggregates due to high speed, frequent acceleration and deceleration. After the surface asphalt film of the race track is aged and lost, the asphalt particles on the road surface will gradually lose adhesion, and further under high temperature, humidity, rain and high-speed load impact, the track surface will accelerate the appearance of loose, rough surface, large-area potholes, and further the middle and lower layers and the base structure of the track surface will be subjected to a series of water damage and structural diseases. Foreign race tracks generally have a milling and repaving of the original track surface after about 10 years of operation, which requires a long maintenance time and high cost. China's first race track, Zhuhai Race Track, was completed in 1996 and was repaved by milling in 2016; Shanghai F1 Race Track was completed in 2004 and was detected and evaluated in 2022, and the overall road condition is good, the flatness is good, and there is no structural damage, but the surface of the race track is polished, rough, aged and whitened. The surface of the race track is subjected to long-term high-strength wear, and if maintenance is not performed in a timely manner, the late-stage diseases will accelerate, which will pose a safety hazard to the race car.

[0003] Therefore, there is an urgent need for a seal coat material with high stability, mechanical strength and wear resistance. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defects of low viscosity, poor stability, easy delamination, poor mechanical strength and poor wear resistance of the seal coat material in the prior art, and to provide a seal coat material and raw material composition, a preparation method and application. The seal coat material has high viscosity, good stability (<2%), no delamination during storage, good mechanical strength and good wear resistance. Spraying the seal coat material on the asphalt pavement can make the friction coefficient of the road surface ≥65BPN, the loss rate of the construction depth ≤10%, and the water permeability coefficient ≤10mL / min.

[0005] The present application provides a raw material composition of a seal coat material, which comprises the following components in mass fraction: anionic emulsified asphalt 30-60 parts, water-based polymer 0-20 parts but not 0 parts, stabilizer 0.1-2.0 parts, asphalt regenerator 1-5 parts and aggregate 30-50 parts.

[0006] In the present application, the anionic emulsified asphalt can be a conventional asphalt microparticle negatively charged emulsified asphalt in the art, preferably a rubber emulsified asphalt or anionic SBS emulsified asphalt.

[0007] When the anionic emulsified asphalt is a rubber emulsified asphalt, the rubber emulsified asphalt preferably satisfies one or more of the following indexes: (1) elongation at break > 100%; (2) evaporation residue softening point ≥ 65°C, preferably ≥ 70°C; and (3) 5°C ductility ≥ 20 cm.

[0008] When the anionic emulsified asphalt is an anionic SBS emulsified asphalt, the anionic SBS emulsified asphalt preferably satisfies (1) and / or (2) of the following indexes: (1) evaporation residue softening point ≥ 65°C, preferably ≥ 70°C; (2) 5°C ductility ≥ 20 cm.

[0009] The evaporation residue softening point is tested according to JTG E20-2011 “Standard Test Methods of Asphalt and Asphalt Mixture” T0606-2011. The 5°C ductility refers to the length of the anionic emulsified asphalt when stretched to break at a temperature of 5°C at a speed of 5 cm per minute.

[0010] In a preferred embodiment, the anionic emulsified asphalt is a rubber emulsified asphalt, which has an elongation at break > 100%, an evaporation residue softening point of 70°C, and a 5°C ductility of 20 cm.

[0011] In a preferred embodiment, the anionic emulsified asphalt is an anionic SBS emulsified asphalt, which has an evaporation residue softening point of 65°C and a 5°C ductility of 24 cm.

[0012] In the present application, the anionic modified emulsified asphalt preferably has a mass fraction of 40-50 parts, for example 45 parts.

[0013] In the present application, the type of the water-based polymer can be conventional in the art, and is preferably a water-based polyurethane and / or a water-based acrylic acid, for example a water-based acrylic acid.

[0014] In the present application, the resin solid content of the water-based polymer can be ≥ 50%, for example 55%.

[0015] In the present application, the pH value of the water-based polymer can be 6-8, for example 7-8.

[0016] In a preferred embodiment, the water-based polymer is a water-based acrylic acid, which has a resin solid content of 55% and a pH value of 7-8.

[0017] In the present application, the mass fraction of the water-based polymer is preferably 10-15 parts, for example 12 or 14 parts.

[0018] In the present application, the type of the stabilizer can be an organic stabilizer conventional in the art, preferably a non-ionic single water-soluble cellulose ether or a polyurethane thickening agent. In the present application, the non-ionic single water-soluble cellulose ether means a water-soluble cellulose ether whose ionization type is non-ionic and whose substituent is one kind.

[0019] In the present application, the non-ionic single cellulose ether is preferably hydroxyethyl cellulose and / or methyl cellulose.

[0020] In the present application, the non-ionic single cellulose ether has a molar substitution degree of 1.5-2.0, preferably 1.6-2.0.

[0021] In the present application, the polyurethane thickening agent can be a polyurethane association thickening agent conventional in the art.

[0022] In the present application, the stabilizer has a water content of ≤6%, preferably ≤5%.

[0023] In the present application, the stabilizer has a salt content of ≤5%.

[0024] In the present application, the stabilizer has an active ingredient content of ≥87%.

[0025] In a preferred embodiment, the stabilizer is hydroxyethyl cellulose, has a water content of ≤6%, an active ingredient content of ≥87%, a salt content of ≤5%, and a molar substitution degree of 1.6-2.0.

[0026] In the present application, the stabilizer preferably has a mass fraction of 0.5-2 parts, for example 0.8 parts, 1 part or 2 parts.

[0027] In the present application, the asphalt regenerating agent can be a material suitable for early and medium-term highway maintenance of asphalt pavement conventional in the art, preferably an asphalt reducing agent and / or rubber oil.

[0028] In the present application, when the asphalt regenerating agent is an asphalt reducing agent, the asphalt reducing agent preferably satisfies one or more of the following indexes: (1) a viscosity ratio in a thin film oven test of ≤2; (2) a kinematic viscosity at 60°C of ≤100 mm 2 / s; and (3) an acid value of 150-220 mg / g.

[0029] In the present application, when the asphalt regenerating agent is rubber oil, the rubber oil preferably satisfies the following indexes (1) and / or (2): (1) a mass content of aromatic hydrocarbons of ≥80%; and (2) a kinematic viscosity at 100°C of ≤20 mm 2 / s.

[0030] The viscosity ratio, 60℃ kinematic viscosity and 100℃ kinematic viscosity of the thin film oven test are tested according to the Highway Engineering Asphalt and Asphalt Mixture Test Regulation T0619. The acid value is tested according to ASTM D-465. The aromatic hydrocarbon mass content is tested according to T0618.

[0031] In a preferred embodiment, the asphalt rejuvenator is an asphalt restorer, which has a thin film oven test viscosity ratio ≤2, an acid value of 150-220 mg / g, a 60℃ kinematic viscosity ≤100 mm 2 / s.

[0032] In the present application, the mass fraction of the asphalt rejuvenator is preferably 1-3 parts, for example 2 parts.

[0033] In the present application, the aggregate can be a granular material that is conventional in the art for providing a skeleton and filling in concrete and mortar, and is preferably one or more of quartz sand, basalt sand and silicon carbide sand.

[0034] In the present application, the particle size of the aggregate can be 0-2 mm.

[0035] In the present application, the aggregate preferably has the following specific composition: (10-20 mesh):(20-40 mesh):(40-80 mesh)=(20-30%):(20-30%):(40-60%). The mass percentage indicates the weight percentage of the aggregate under each particle size in the total weight of the aggregate.

[0036] In the present application, the Mohs hardness of the aggregate can be ≥6, for example 7.

[0037] In the present application, the mass fraction of the aggregate is preferably 30-45 parts, for example 32 parts or 40 parts.

[0038] In the present application, the raw material of the seal coat preferably further comprises a nano additive and / or a reinforcing agent.

[0039] The nano additive can be an inorganic substance that is conventional in the art for increasing the stability of the seal coat, and is preferably one or more of aerogel, attapulgite and bentonite, for example attapulgite. The aerogel is preferably purchased from Hubei Hui Fu Nanometer Material Co., Ltd., and the model is HB-202N.

[0040] When the nano additive is aerogel, the aerogel preferably satisfies one or more of the following conditions: (1) hydrophobic type; (2) specific surface area ≥150 m 2 / g; (3) silicon dioxide content ≥99.5%; (4) pH is 7-10; and (5) bulk density can be 40-60 g / L.

[0041] In a preferred embodiment, the nano-additive is aerogel silicon, which is hydrophobic, has a specific surface area of 170 m 2 / g, a silica content of 99.8%, a pH of 7-8, and a bulk density of 50 g / L.

[0042] When the nano-additive is attapulgite, the attapulgite preferably satisfies one or more of the following conditions: (1) mesh size of 1000-1800 mesh; (2) pH of 7-10; and (3) specific gravity of 0.2-0.5.

[0043] When the nano-additive is bentonite, the bentonite preferably satisfies one or more of the following conditions: (1) purity of ≥90%; (2) pH of 7-10; and (3) swelling ratio of 10-30.

[0044] The mass fraction of the nano-additive can be 3-15 parts, preferably 5-12 parts, for example 7 parts, 8 parts, or 10 parts.

[0045] The type of the reinforcing agent can be a material that is conventional in the art and can improve the mechanical properties of the seal coat material, and is preferably one or more of lime powder, cement, and fly ash.

[0046] When the reinforcing agent is lime powder, the lime powder preferably satisfies one or more of the following conditions: (1) slaked lime powder; (2) ≥200 mesh; and (3) effective content of ≥90%. It should be understood by those skilled in the art that the slaked lime powder generally refers to calcium hydroxide.

[0047] The mass fraction of the reinforcing agent can be 5-25 parts, preferably 5.5-15 parts, for example 5.5 parts, 7.5 parts, 8.2 parts, 10 parts, or 12 parts.

[0048] In the present application, the key sieve pass rate of the solid raw materials in the raw material composition of the seal coat material can be: a 0.075 mm sieve pass rate of 20-40%, a 0.3 mm sieve pass rate of 30-50%. In the present application, the key sieve refers to a sieve with a particle size of 0.075 mm and 0.3 mm.

[0049] In the present application, the sieve pass rate of the solid raw materials in the raw material composition of the seal coat material is preferably: a 0.075 mm sieve pass rate of 20-40%, a 0.3 mm sieve pass rate of 30-50%, a 0.6 mm sieve pass rate of 60-100%, and a 2.36 mm sieve pass rate of 100%.

[0050] In the present application, the solid raw materials in the raw material composition of the seal coat material include stabilizers and aggregates. When the raw material composition of the seal coat material further includes nano additives and / or reinforcing agents, the solid raw materials in the raw material composition of the seal coat material include nano additives and / or reinforcing agents, stabilizers and aggregates.

[0051] In a preferred embodiment, the raw material composition of the seal coat material includes the following components in mass fraction: 30-50 parts of anionic emulsified asphalt, 10-20 parts of water-based polymer, 5-25 parts of reinforcing agent, 3-15 parts of nano additive, 0.1-2.0 parts of stabilizer, 1-5 parts of regenerating agent, and 30-50 parts of aggregate.

[0052] In a preferred embodiment, the raw material of the seal coat material includes the following components in mass fraction: 40 parts of anionic emulsified asphalt, 14 parts of water-based polymer, 7.5 parts of reinforcing agent, 5 parts of nano additive, 0.5 parts of stabilizer, 1 part of regenerating agent, and 32 parts of aggregate; the anionic emulsified asphalt is rubber emulsified asphalt, the water-based polymer is water-based acrylic acid, the reinforcing agent is lime powder, the nano additive is gas silicon, the stabilizer is hydroxyethyl cellulose, and the regenerating agent is asphalt reducing agent.

[0053] In a preferred embodiment, the raw material of the seal coat material includes the following components in mass fraction: 30 parts of anionic emulsified asphalt, 10 parts of water-based polymer, 10 parts of reinforcing agent, 7 parts of nano additive, 2 parts of stabilizer, 1 part of regenerating agent, and 40 parts of aggregate; the anionic emulsified asphalt is rubber emulsified asphalt, the water-based polymer is water-based acrylic acid, the reinforcing agent is lime powder, the nano additive is gas silicon, the stabilizer is hydroxyethyl cellulose, and the regenerating agent is asphalt reducing agent.

[0054] The present application also provides a preparation method of a seal coat material, which includes the following steps: mixing the raw material composition of the seal coat material.

[0055] In the present application, the ambient temperature during the mixing is preferably room temperature. The room temperature can be 20-30°C.

[0056] In the present application, the mixing preferably further includes stirring.

[0057] The stirring can be performed in a stirrer. The rotation speed of the stirrer can be 100-500 r / min, such as 100-300 r / min or 200-500 r / min.

[0058] The stirring time can be 5-30 min, such as 5-15 min, 10-30 min, or 20-30 min.

[0059] In the present application, the preparation method of the seal coat material preferably comprises the following steps: firstly mixing the stabilizer and the anionic modified emulsified asphalt, first stirring, then sequentially adding the nano additive and the regenerant, second stirring, and adding the aggregate after the viscosity of the mixture is ≥20000 mPa·s, and third stirring. When the raw materials of the seal coat material comprise a reinforcing agent, the preparation method of the seal coat material more preferably comprises the following steps: firstly mixing the stabilizer and the anionic modified emulsified asphalt, first stirring, then sequentially adding the nano additive, the reinforcing agent and the regenerant, second stirring, and adding the aggregate after the viscosity of the mixture is ≥20000 mPa·s, and third stirring.

[0060] In the first stirring, the rotating speed of the stirrer can be 200-500 r / min, for example, 300 r / min. The time of the first stirring can be 10-30 min, for example, 20 min.

[0061] In the second stirring, the rotating speed of the stirrer can be 200-500 r / min, for example, 300 r / min. The time of the first stirring can be 20-30 min, for example, 20 min.

[0062] In the third stirring, the rotating speed of the stirrer can be 100-300 r / min, for example, 150 r / min. The time of the first stirring can be 5-15 min, for example, 10 min.

[0063] The present application also provides a seal coat material prepared by the preparation method as described above.

[0064] In the present application, the tensile strength of the seal coat material can be ≥2 MPa. The tensile strength is tested at an ambient temperature of 25℃.

[0065] In the present application, the wear resistance of the seal coat material can be <100 g / m 2 . The wear resistance is tested under water immersion at 50℃ for 1 day.

[0066] In the present application, the viscosity of the seal coat material can be 50000-80000 mPa·s. The viscosity is tested at room temperature.

[0067] In the present application, the stability of the seal coat material can be ≤3%.

[0068] In the present application, the seal coat material preferably has a non-Newtonian fluid structure, more preferably a shear-thinning non-Newtonian fluid structure.

[0069] The present application also provides an application of the seal coat material as described above as a road maintenance material.

[0070] In this invention, the road maintenance field is preferably the racetrack field.

[0071] In this invention, the preferred application is to spray the sealing material onto the asphalt pavement.

[0072] The spraying equipment is preferably a high-pressure intelligent spraying equipment.

[0073] Preferably, the spraying device includes 16 nozzles. The pressure of each nozzle during spraying is preferably 0.4-0.6 MPa.

[0074] The spraying rate can be 0.8 kg / m³. 2 -1.2kg / m 2 .

[0075] The spraying width can be 4m.

[0076] The spraying speed can be 5km-10km / h.

[0077] Before spraying, it is generally necessary to ensure that the original asphalt pavement is flat and uniform, and to clean the original asphalt pavement thoroughly.

[0078] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0079] The reagents and raw materials used in this invention are all commercially available.

[0080] The positive and progressive effects of this invention are as follows: This invention allows for the mixing of specific mass proportions of raw materials to obtain a sealant material. This sealant material has high viscosity, good stability (<2%), does not delaminate during storage, has good mechanical strength and wear resistance, and is simple, quick, energy-saving, and environmentally friendly to apply. When used on asphalt pavements, after six months of curing, the pavement friction coefficient can reach ≥65 BPN, the texture depth loss rate can be ≤10%, and the water permeability coefficient can be ≤10 mL / min. Applying it to racetrack pavement maintenance can prevent accelerated track damage while improving the basic performance of the track surface, allowing the track to continue to maintain its excellent service capacity and extending its service life. The high wear-resistant and anti-skid sealant material has high bonding strength, good anti-skid and wear-resistant properties, can be produced and applied at room temperature, and is energy-saving and environmentally friendly. Attached Figure Description

[0081] Figure 1 This is a flowchart illustrating the application of the sealing material as a road maintenance material in the embodiments.

[0082] Figure 2 Images show the sealing material of Example 1 during and after application (a during application, b after application).

[0083] Figure 3 Pictures of the seal coat material of Example 7 during and after construction (a is during construction, b is after construction). DETAILED DESCRIPTION

[0084] The application will be further described in the following examples without limiting the application to the examples described. The experimental methods in the following examples, if not otherwise specified, are carried out according to the conventional methods and conditions, or according to the instructions of the commercial products.

[0085] All the raw materials in the examples and comparative examples of the application can be obtained commercially, and the commercial sources and properties of the main raw materials are shown in Table 1.

[0086] Table 1

[0087]

[0088]

[0089] Examples 1-7

[0090] The compositions of the raw materials of the seal coat materials in Examples 1-7 are shown in Table 2, wherein the raw material composition of the seal coat material used in the application example of Shanghai F1 international race track is Example 1, and the raw material composition of the seal coat material used in the application example of Zhuzhou F2 international race track is Example 7.

[0091] Table 2

[0092]

[0093]

[0094] In Table 1, the aggregate in Examples 1-6 is basalt sand, and the specific composition thereof includes the following: (10-20 mesh) : (20-40 mesh) : (40-80 mesh) in a mass ratio of 20:30:50, and the hardness is 7. The sieve pass rate of the solid raw materials in the raw material composition of the seal coat material is as follows: the sieve pass rate of 0.075 mm sieve is 28.1%, the sieve pass rate of 0.3 mm sieve is 38.2%, the sieve pass rate of 0.6 mm sieve is 74.8%, and the sieve pass rate of 2.36 mm sieve is 100%.

[0095] In Table 1, the aggregate in Example 7 is quartz sand, and its specific composition includes the following: (10-20 mesh) : (20-40 mesh) : (40-80 mesh) in a mass ratio of 20 : 20 : 60, and the hardness is 6. The sieve pass rate of the solid raw material in the raw material composition of the seal coat material is as follows: 0.075 mm sieve pass rate is 35.3%, 0.3 mm sieve pass rate is 36.0%, 0.6 mm sieve pass rate is 79.1%, and 2.36 mm sieve pass rate is 100%.

[0096] Example 8

[0097] The difference from Example 1 is that the type of stabilizer is hydroxypropyl cellulose.

[0098] Example 9

[0099] The difference from Example 1 is that the aggregate is basalt sand, and its specific composition includes the following: (10-20 mesh) : (20-40 mesh) : (40-80 mesh) in a mass ratio of 0 : 35 : 65, and the hardness is 7. The sieve pass rate of the solid raw material in the raw material composition of the seal coat material is as follows: 0.075 mm sieve pass rate is 28.1%, 0.3 mm sieve pass rate is 48.3%, 0.6 mm sieve pass rate is 93%, and 2.36 mm sieve pass rate is 100%.

[0100] Example 10

[0101] The difference from Example 1 is that the aggregate is basalt sand, and its specific composition includes the following: (10-20 mesh) : (20-40 mesh) : (40-80 mesh) in a mass ratio of 35 : 35 : 30, and the hardness is 7. The sieve pass rate of the solid raw material in the raw material composition of the seal coat material is as follows: 0.075 mm sieve pass rate is 27.8%, 0.3 mm sieve pass rate is 34.3%, 0.6 mm sieve pass rate is 65%, and 2.36 mm sieve pass rate is 100%.

[0102] The preparation method of the seal coat material in Examples 1-10 includes the following steps:

[0103] At room temperature, the stabilizer and the anionic emulsified asphalt are stirred in a blender at a speed of 300 r / min for 20 minutes, and then the nano additive, the reinforcing agent, and the rejuvenator are added in sequence, and stirred at a speed of 300 r / min for 20 minutes. When the viscosity of the emulsion is > 20,000 mPa·s, the aggregate is added, and stirred at a speed of 150 r / min for 10 minutes to obtain the seal coat material.

[0104] Comparative Example 1

[0105] The difference from Example 1 is only that the "anion modified emulsified asphalt" is replaced by "cationic SBS emulsified asphalt".

[0106] The cationic SBS emulsified asphalt cannot be mixed with the water-based polymer due to the formation of lumps, and the subsequent effect test cannot be performed.

[0107] Comparative Example 2

[0108] The difference from Example 1 is only that the aggregate is not contained in the seal coat material.

[0109] Comparative Example 3

[0110] The difference from Example 1 is only that the raw material composition of the seal coat material includes the following components in mass fraction: anion emulsified asphalt 55 parts, water-based polymer 3 parts, reinforcing agent 3.92 parts, nano additive 18 parts, stabilizer 0.08 parts, and aggregate 20 parts.

[0111] Effect Example 1

[0112] The seal coat materials of Examples 1-10 and Comparative Examples 1-3 are tested for tensile strength, wear resistance, viscosity, and stability, and the test standards are shown in Table 3, and the test results are shown in Table 4.

[0113] Table 3

[0114] Test index Test standard Tensile strength MPa JTG / T 3364-02-2019 Appendix B (Modified asphalt concrete base) Wear resistance g / m2 JT / T 1330-2020 Viscosity mPa-s JTG E20-2011 / T0625 Stability % JTG 5142 Appendix B.4

[0115] Table 4

[0116]

[0117] Note: In Comparative Example 2, since no aggregate is added to the seal coat material, its stability cannot be tested.

[0118] Effect Example 2

[0119] According to the flowchart of Figure 1 , the seal coat materials of Examples 1-8 and Comparative Example 3 are sprayed on the asphalt pavement using a high-pressure intelligent spraying device (modified using a Dongfeng Tianjin 18-ton truck, with a 8000L asphalt tank with stirring device installed; an imported asphalt pump is used to ensure the transportation and spraying of the seal coat material emulsion; an imported air compressor is installed to meet the requirements of 16 air-assisted atomizing nozzles). The device has 16 nozzles, each nozzle has a pressure of 0.4-0.6MPa, a spraying amount of 0.8kg / m 2 -1.2kg / m 2 , and a spraying width of 4m, with a spraying speed of 5-10km / h. Before spraying, the original pavement needs to be flat and uniform, and the original asphalt pavement needs to be cleaned.

[0120] Figure 2 Pictures of the seal coat material of Example 1 during and after construction (a: during construction, b: after construction) in actual application.

[0121] Figure 3 Pictures of the seal coat material of Example 7 during and after construction (a: during construction, b: after construction) in actual application.

[0122] After the seal coat material of Comparative Example 2 was sprayed, the aggregate identical to that of Example 1 was scattered.

[0123] After maintenance, the road surface friction coefficient, construction depth loss rate, and water permeation coefficient of the asphalt pavement were tested, and the test standards and test results are shown in Table 5.

[0124] Table 5

[0125]

[0126] After maintenance for half a year, the road surface friction coefficient and water permeation coefficient of the asphalt pavement were tested again, and the test results are shown in Table 6.

[0127] Table 6

[0128] Test index Test standard Example 1 Example 7 Comparative Example 2 Comparative Example 3 Pavement friction coefficient T0964 66 65 53 50 Water permeability coefficient T0971 2 2 8 13

[0129] As can be seen from Table 5, immediately after maintenance, the road surface friction coefficient, construction depth loss rate, and water permeation coefficient of the seal coat materials of Examples 1-8 and Comparative Examples 2-3 all meet the requirements specified in the standard (water permeation coefficient ≤ 10 mL / min, construction depth loss rate ≤ 20%).

[0130] As can be seen from Table 6, after maintenance for half a year, the road surface friction coefficient and water permeation coefficient of the seal coat materials of Comparative Examples 2-3 all show a large degree of decrease compared to Examples 1 and 7.

Claims

1. A method for preparing a sealing layer material, characterized in that, It includes the following steps: mixing the raw material composition of the sealing material; The raw material composition of the sealing material includes the following components in parts by weight: 30-60 parts of anionic emulsified asphalt, 0-20 parts of water-based polymer (but not 0 parts), 0.1-2.0 parts of stabilizer, 1-5 parts of asphalt recycling agent, and 30-50 parts of aggregate. The anionic emulsified asphalt is rubber emulsified asphalt or anionic SBS emulsified asphalt. The aqueous polymer is aqueous polyurethane and / or aqueous acrylic; The specific composition of the aggregate is as follows: (10-20 mesh): (20-40 mesh): (40-80 mesh) = (20-30%): (20-30%): (40-60%). The raw materials of the sealing material also include nano-additives and / or reinforcing agents; The nano-additive is present in 3-15 parts by mass. The reinforcing agent is present in 5-25 parts by weight; The key sieve pass rates of the solid raw materials in the raw material composition of the sealing material are: 20-40% for 0.075mm sieves and 30-50% for 0.3mm sieves.

2. The method for preparing the sealing layer material as described in claim 1, characterized in that, The stabilizer is a nonionic single water-soluble cellulose ether or a polyurethane thickener. And / or, the asphalt recycling agent is an asphalt reducing agent and / or rubber oil; And / or, the aggregate is one or more of quartz sand, basalt sand and corundum.

3. The method for preparing the sealing layer material as described in claim 2, characterized in that, When the anionic emulsified asphalt is rubber emulsified asphalt, the rubber emulsified asphalt meets one or more of the following indicators: (1) elongation at break > 100%; (2) softening point of evaporation residue ≥ 65℃; and (3) ductility at 5℃ ≥ 20cm; And / or, when the anionic emulsified asphalt is anionic SBS emulsified asphalt, the anionic SBS emulsified asphalt meets the following indicators (1) and / or (2): (1) Evaporation residue softening point ≥ 65℃; (2) 5℃ ductility ≥ 20cm; And / or, the aqueous polymer meets (1) and / or (2) of the following indicators: (1) resin solid content ≥ 50%; (2) pH value 6-8; And / or, the nonionic single water-soluble cellulose ether is hydroxyethyl cellulose and / or methyl cellulose; And / or, the molar degree of substitution of the nonionic single water-soluble cellulose ether is 1.5-2.0; And / or, the stabilizer meets one or more of the following criteria: (1) water content ≤ 6%; (2) salt content ≤ 5%; and (3) active ingredient content ≥ 87%; And / or, when the asphalt rejuvenator is an asphalt reducing agent, the asphalt reducing agent meets one or more of the following indicators: (1) viscosity ratio in a thin film oven test ≤ 2; (2) kinematic viscosity at 60℃ ≤ 100 mm. 2 / s; and (3) the acid value is 150-220 mg / g; And / or, when the asphalt rejuvenator is rubber oil, the rubber oil meets the following (1) and / or (2) criteria: (1) aromatic hydrocarbon content ≥ 80% by mass; (2) kinematic viscosity at 100°C ≤ 20 mm. 2 / s; And / or, the Mohs hardness of the aggregate is ≥6.

4. The method for preparing the sealing layer material as described in claim 3, characterized in that, The softening point of the evaporation residue of the rubber emulsified asphalt is ≥70℃; And / or, the evaporation residue softening point of the anionic SBS emulsified asphalt is ≥70℃; And / or, the aqueous polymer meets (1) and / or (2) of the following specifications: (1) resin solid content is 55%; (2) pH value is 7-8; And / or, the molar degree of substitution of the nonionic single water-soluble cellulose ether is 1.6-2.0; And / or, the water content of the stabilizer is ≤5%; And / or, the aggregate has a Mohs hardness of 7.

5. The method for preparing the sealing layer material as described in claim 1, characterized in that, The anionic emulsified asphalt has a mass fraction of 40-50 parts; And / or, the aqueous polymer is in the form of 10-15 parts by mass; And / or, the stabilizer is present in parts by weight of 0.5-2 parts; And / or, the asphalt recycling agent is 1-3 parts by mass; And / or, the aggregate is 30-45 parts by weight.

6. The method for preparing the sealing layer material as described in claim 5, characterized in that, The anionic emulsified asphalt has a mass fraction of 45 parts; And / or, the aqueous polymer is in parts by mass of 12 or 14; And / or, the stabilizer is present in parts by weight of 0.8 parts, 1 part, or 2 parts; And / or, the asphalt recycling agent is in the form of 2 parts by mass; And / or, the aggregate is 32 or 40 parts by weight.

7. The method for preparing the sealing layer material as described in claim 1, characterized in that, The nano-additive is one or more of silica, attapulgite and bentonite. And / or, the nano-additive is present in 5-12 parts by mass; And / or, the reinforcing agent is one or more of lime powder, cement and fly ash; And / or, the reinforcing agent is present in parts by weight of 5.5-15 parts.

8. The method for preparing the sealing layer material as described in claim 7, characterized in that, The nano-additive is attapulgite. And / or, the nano-additive is present in 7, 8, or 10 parts by mass; And / or, the reinforcing agent is present in parts by weight of 5.5, 7.5, 8.2, 10, or 12.

9. A sealing layer material, characterized in that, It is prepared by the method of preparing the sealing material as described in any one of claims 1-8.

10. The sealing layer material as claimed in claim 9, characterized in that, The pull-out strength of the sealing material is ≥2MPa; And / or, the abrasion resistance of the sealing material is <100g / m 2 ; And / or, the viscosity of the sealing material is 50,000-80,000 mPa·s; And / or, the stability of the sealing material is ≤3%; And / or, the sealing material has a non-Newtonian fluid structure.

11. The sealing layer material as claimed in claim 10, characterized in that, The sealing material has a shear-dilution type non-Newtonian fluid structure.

12. An application of the sealing layer material as described in any one of claims 9-11 as a road maintenance material.

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