Super-adhesive high-permeability reducing thin-layer special-purpose tack coat and its preparation method and application

Abstract

This invention discloses a super-viscous, high-permeability reducing thin-layer tack coat oil, its preparation method, and its application, relating to the field of road engineering technology. The tack coat oil is made from the following raw materials in parts by weight: 60 parts of oil slurry asphalt composition, 5-8 parts of modifier, 30-35 parts of regenerator, 2-5 parts of surfactant, and 0.6-1.2 parts of compatibilizer. The tack coat oil of this invention not only has high initial and forming strength and permeability, but also improves construction efficiency, eliminating the need for pre-spraying and waiting for emulsion breaking. It also has a regeneration and restoration effect on old pavements, activating the activity of oxidized asphalt and repairing bonding failures. Furthermore, this tack coat oil has strong adaptability to the construction environment, making it less likely for subsequent paving machinery tires to lift it, and eliminating the need for a dedicated paver.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, specifically to a special tack coat oil for ultra-viscous, high-permeability reducing thin-layer coatings, its preparation method, and its application. Background Technology

[0002] The tack coat is a thin layer of material applied to integrate the multi-layered asphalt pavement system, ensuring it bears the load. During the operational phase, the overall structural strength of the pavement is significantly limited by the interlayer contact condition. When the pavement is laid from bottom to top, sufficient vibration compaction ensures that each structural layer is flat and dense, resulting in interlayer friction lower than the mixture itself. Based on the "barrel effect" principle, overall strength depends on the weakest link – the interlayer structure. Good interlayer bonding prevents early phenomena such as surface slippage and peeling caused by insufficient ultimate shear and pull-out strength, giving the multi-layered pavement system good structural load-bearing capacity and durability, and extending the pavement's lifespan.

[0003] Currently, emulsified tack coats commonly used in road construction often experience adhesion failure when applied to thin overlays. The main reasons are: 1. Low bond strength; 2. Weak penetration, failing to effectively connect upper and lower layers; 3. Long demulsification time; 4. Easily lifted by subsequent paving tires after film formation, leading to adhesion failure. Furthermore, the interlayer adhesion of extremely thin overlays is more stringent than that of traditional thick overlays. When traffic loads act on asphalt pavement, the peak value of the maximum shear force generated by horizontal stress is generally 1.5–2.5 cm above the top layer, which is precisely the location of the tack coat in thin overlays.

[0004] Therefore, it is imperative to develop a new type of tack coat oil that has outstanding advantages such as strong adhesion to thin-layer coatings, high permeability, short demulsification time, and non-sticking to the wheels during construction equipment operation. Summary of the Invention

[0005] The technical problem this invention aims to solve is to provide a super-viscous, high-permeability reducing thin-layer tack coat and its preparation method. This tack coat not only possesses high initial and forming strength and permeability, but also improves construction efficiency, eliminating the need for pre-spraying and waiting for emulsion demulsification. Furthermore, it has a regeneration and restoration effect on old pavements, activating the activity of oxidized asphalt and repairing bonding failures. Moreover, this tack coat is highly adaptable to the construction environment, is less likely to be lifted by the tires of subsequent paving machinery, and does not require a dedicated paver, reducing the difficulty of equipment preparation and construction, thus facilitating large-scale promotion.

[0006] The technical problem to be solved by this invention is achieved by the following technical solution:

[0007] One objective of this invention is to provide a special tack coat oil for ultra-viscous, high-permeability reducing thin-film coatings, made from the following raw materials in parts by weight:

[0008]

[0009] In this invention, the lake bitumen composition comprises coking oil slurry and Trinidad Lake bitumen, with a penetration of 30–50 dmm and a softening point greater than 60°C. Further, the weight ratio of the coking oil slurry to Trinidad Lake bitumen is (1–3):(1–3), preferably 2:3. The coking oil slurry and Trinidad Lake bitumen can be blended using a high-temperature catalytic dissolution process.

[0010] In this invention, the modifier includes nano-silicon hybrid resin, thermoplastic polyurethane (TPU), and styrene-butadiene rubber (SBR). Further, the weight ratio of the nano-silicon hybrid resin to TPU and SBR is (3-5):(1-3):(1-3), preferably 4:2:1.

[0011] In this invention, the regenerator is a high-boiling-point aromatic organic compound, including heavy aromatic oil, dearomatized solvent oil, and light aromatic oil, with a relative molecular weight of 270-290, a distillation range of 200-280℃, and an aromatic content greater than 98%. Further, the weight percentages of heavy aromatic oil, dearomatized solvent oil, and light aromatic oil in the regenerator are 30-50%, 20-40%, and 20-40%, respectively.

[0012] In this invention, the surfactant comprises a nonionic penetrant and an AB-type block polymeric surfactant. Further, the weight ratio of the nonionic penetrant to the AB-type block polymeric surfactant is (1-2):(1-2), preferably 1:1. Specifically, the nonionic penetrant is an alkylphenol polyoxyethylene ether, and the AB-type block polymeric surfactant is PBA-b-PDMAEA.

[0013] In this invention, the compatibilizer is one or a mixture of two of glycidyl methacrylate and vinyl resin.

[0014] The second objective of this invention is to provide a method for preparing a special tack coat oil for ultra-viscous, high-permeability reducing thin-film coatings, comprising the following steps:

[0015] A. Add the modifier to the regenerator, and shear to obtain the modified regenerated solution;

[0016] B. Heat the oil slurry lake asphalt composition in a sealed container until it becomes a liquid flow, and add surfactant and compatibilizer in sequence. Shearing completes the pretreatment of the oil slurry lake asphalt composition.

[0017] C. The modified recycled liquid prepared in step A and the oil slurry lake asphalt composition pretreated in step B are sheared and cured at 150-170℃ to obtain a special tack coat oil for ultra-viscous and high-permeability reducing thin-layer overlay.

[0018] The modifier described in step A is added to the regenerator in the form of flakes or fine powder.

[0019] In step A, shearing is used to fully dissolve the modifier in the high-boiling-point aromatic organic solvent, thereby enhancing the fluidity of the modifier, improving its stability, reducing segregation to a certain extent, and ensuring the modifier's effectiveness.

[0020] In step B, based on the characteristic that "the higher the temperature, the more obvious the Brownian motion", surfactants and compatibilizers are added to the emulsion-like oil slurry lake asphalt composition in a high-temperature closed space, which greatly shortens the shear dispersion reaction time of the raw materials and makes the materials dispersed evenly to a physical degree.

[0021] The shearing described in step C is divided into two stages. The first stage of shearing takes place in a closed container, and the second stage takes place in an open container. In the first stage, heating the closed container prevents the volatile gases in the mixture from escaping, creating a pressurizing effect within the closed container. During the pressure increase, the modifier, surfactant, regenerator, compatibilizer, and oil slurry asphalt composition fully contact and react, accelerating the preparation process. In the second stage, the container is opened, and the internal pressure drops instantaneously. This invention, by controlling the switching between high and normal pressure states, makes the blended oil slurry asphalt composition more fluffy and elastic, accelerating the modification speed of the admixtures.

[0022] The third objective of this invention is to provide the application of the super-viscous, high-permeability reducing thin-layer tack coat oil in road construction.

[0023] The beneficial effects of this invention are:

[0024] 1. The asphalt composition of the oil slurry lake in this invention is prepared by blending coking oil slurry with Trinidad Lake asphalt using a high-temperature catalytic dissolution process. Taking advantage of the characteristics of Trinidad Lake asphalt being rich in aromatics and poor in waxes and having few heteroatoms, it is blended with coking oil slurry with high content of heavy aromatics and low degree of condensation to prepare asphalt matrix. It has the characteristics of high softening point, strong resistance to photo-oxidation and thermo-oxidation aging, and good plasticity.

[0025] 2. This invention fully utilizes the excellent bonding properties of nano-silicon hybrid resin and the superior high and low temperature performance and strength of polyurethane as a modifying component, thereby improving the interfacial bonding force as an interlayer adhesive, while also providing good high and low temperature performance and non-stick properties during application. Simultaneously, the latex-like nature of SBR increases the compatibility between the nano-silicon hybrid resin and TPU, enhances storage stability, and prevents segregation that could lead to a decrease in modification effectiveness.

[0026] 3. The nano-silicon hybrid resin in this invention can significantly improve the physical properties of tack coat, such as tensile strength, elongation at break, and impact strength, and form an elastic network layered structure on the surface of the tack coat to isolate the lower layer from the contact with the tire; at the same time, combined with the oil slurry lake asphalt composition with a high softening point in this invention, it can prevent the tire from sticking when the road surface temperature reaches 60°C and has good storage stability.

[0027] 4. The regenerator used in this invention is a high-boiling-point aromatic organic compound, mainly composed of aromatic components and gums. It can replenish the oxidized light components of the old pavement, activate asphalt activity, and repair the adhesion failure of the old asphalt. During the preparation of the modified regenerated liquid, based on the principle of "like dissolves like," it can promote the dissolution of the polymer modifier, improve storage stability, and reduce segregation.

[0028] 5. The surfactant used in this invention is a complex of nonionic penetrant and AB-type block polymer surfactant. The two have a synergistic effect, which enhances the dispersibility and miscibility of each polymer material, reduces surface energy, and makes the tack coat oil have a lower surface tension and good wetting ability of the substrate. This ensures that the tack coat oil can penetrate into the substrate more easily to a depth of 1-2 cm, reduces the porosity of the concrete, and creates a nail effect between the upper and lower structural layers. It is difficult for subsequent paving machinery to damage the already applied tack coat oil surface. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments.

[0030] Performance testing methods for tack coat oils:

[0031] 1. The adhesion properties of the tack coat oil are evaluated using shear strength and pull-out strength.

[0032] Shear strength test: Base course specimens were formed in 300mm×300mm×100mm rutted slabs, with tack coat sprayed in the middle and ordinary asphalt as the upper wearing course. After curing in a 100℃ blower for 48 hours, the specimens were demolded and cut to match the size of the oblique shear test mold (100mm×100mm×100mm). The shear strength of the tack coat was evaluated by oblique shear test, with the shear plane at an angle of 40° to the horizontal plane. A universal testing machine was used to uniformly load the specimen at a speed of 2mm / min, and the ultimate load F at which the specimen slipped and failed was recorded. The load was then converted to the interlayer shear strength using the following formula.

[0033] τ=sin〖40°〗×F / S

[0034] In the formula: τ is the interlaminar shear strength, in MPa; F is the ultimate load at which the specimen undergoes slip failure, in N; S is the shear area of ​​the specimen, in mm². 2 .

[0035] Pull-out strength test: Fix the above samples as a whole on a universal testing machine and perform a pull-out test at a speed of 20 mm / min. Perform 3 parallel tests for each group and take the average value of the results.

[0036] 2. The permeability of the tack coat oil was evaluated using a standard sand permeability test.

[0037] Penetration depth test: 65g of standard sand was placed vertically and uniformly into a 50mL graduated cylinder. 7g of tack coat oil was weighed and added uniformly into the graduated cylinder. Timing started when the tack coat oil touched the standard sand in the graduated cylinder. Penetration was maintained for 10 minutes, and the mass M of the loose standard sand at the bottom was recorded. a Convert to penetration depth using the following formula.

[0038] Ηa=K×(65-M a )) / A

[0039] In the formula: Ha is the penetration depth of the clay layer oil, in cm; K is the loose packing coefficient of the standard sand, in cm. 3 / g;M a The mass of the loose standard sand at the bottom is in grams; A is the inner surface area of ​​a 50mL graduated cylinder, 4.15cm². 2 .

[0040] 3. The rutting performance of tack coat oil was evaluated using the rutting plate method.

[0041] Adhesion test: at 0.2 kg / m 2 The tack coat was evenly sprayed onto a standard AC-13 rutted slab specimen (300mm×300mm×100mm). The length of asphalt remaining on the surface was recorded when the rubber wheel rolled back and forth, and the sticking rate was calculated from this. The higher the sticking rate, the more severe the sticking of the material to the wheel.

[0042] Example 1

[0043] The raw material composition and formulation of tack coat oil are as follows:

[0044] The composition, by weight, comprises 60 parts of oil slurry lake bitumen composition, 7 parts of modifier, 33 parts of regenerator, 4 parts of surfactant, and 1 part of compatibilizer. Specifically, the oil slurry lake bitumen composition is a mixture of coking oil slurry and Trinidad Lake bitumen in a weight ratio of 2:3, with a penetration of 40 dmm and a softening point greater than 60℃; the modifier is a mixture of nano-silica hybrid resin, TPU, and SBR in a weight ratio of 4:2:1; the regenerator is a mixture of heavy aromatic oil, dearomaticated alkane solvent oil, and light aromatic oil in weight proportions of 45%, 30%, and 25%, respectively, with a relative molecular weight of 270–290, a distillation range of 200–280℃, and an aromatic content greater than 98%; the surfactant is a mixture of alkylphenol polyoxyethylene ether and PBA-b-PDMAEA in a weight ratio of 1:1; and the compatibilizer is glycidyl methacrylate.

[0045] The preparation of the tack coat oil according to the above raw material composition and proportions includes the following steps:

[0046] A. After the modifier is made into a sheet, it is added to the regenerator and sheared at 2000 rpm for 0.5 h at 25 °C.

[0047] B. In a sealed container, heat the mixture to 180°C to make the oil slurry lake asphalt composition flow into a liquid state, and add surfactant and compatibilizer in sequence. Shear at a shear rate of 2000 rpm for 0.5 hours to complete the pretreatment of the oil slurry lake asphalt composition.

[0048] C. The modified regenerated liquid prepared in step A and the oil slurry lake asphalt composition pretreated in step B are sheared at 160°C for 1 hour. The container should be sealed during the first 30 minutes of shearing, and the container should be open during the last 30 minutes of shearing. The mixture is then cured in an oven at 80°C for 3 hours to obtain the tack coat.

[0049] Examples 2-4 and Comparative Example 1

[0050] The preparation method of the tack coat oil is the same as in Example 1, except that the amounts of each raw material were adjusted, as shown in Table 1. Comparative Example 1 uses NovaBond tack coat oil from the foreign Novachip ultra-thin coating technology.

[0051] The performance of the tack coat oils prepared in Examples 2-4 and the tack coat oil selected in Comparative Example 1 was tested, and the test results are shown in Table 1.

[0052] Table 1

[0053] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Oil slurry lake bitumen composition / part 60 60 60 60 - Modifier / part 7 6 8 5 - Regenerator / part 33 32 30 35 - surfactant / part 4 3 2 5 - Compatibilizer / part 1 1 0.6 1.2 - Penetration depth / cm 1.7 1.4 1.2 2.0 1.0 Shear strength / MPa 1.947 1.678 2.462 1.245 1.228 Pull-out strength / MPa 1.212 0.806 1.401 0.641 0.626 60℃ Adhesion Rate / % 4.5 4.0 5.6 4.8 8.7

[0054] As shown in Table 1, the tack coat oils prepared in Examples 1-4 all have a penetration depth of not less than 1.2 cm, a shear strength of not less than 1.2 MPa, a pull-out strength of not less than 0.6 MPa, and a wheel adhesion rate of not more than 5.6%. Compared with the foreign NovaBond tack coat oil, the tack coat oil described in this invention has superior performance.

[0055] Examples 5-6 and Comparative Examples 2-3

[0056] The preparation method of the tack coat is the same as in Example 1, except that the weight ratio of coking oil slurry (A) to Trinidad Lake bitumen (B) was adjusted, as shown in Table 2.

[0057] The performance of the tack coat oils prepared in Examples 5-6 and Comparative Examples 2-3 was tested, and the test results are shown in Table 2.

[0058] Table 2

[0059] Example 1 Example 5 Example 6 Comparative Example 2 Comparative Example 3 The weight ratio of A to B 2:3 1:1 1:3 1:4 4:1 Penetration depth / cm 1.7 1.5 1.2 1.0 0.7 Shear strength / MPa 1.947 1.856 1.674 1.352 1.068 Pull-out strength / MPa 1.212 1.039 0.862 0.713 0.529 60℃ Adhesion Rate / % 4.5 5.0 5.9 7.6 8.4

[0060] As can be seen from Table 2, when the weight ratio of coking oil slurry to Trinidad Lake bitumen is (1-3):(1-3), the tack coat has the advantages of large penetration depth, high shear strength and pull-out strength, and low sticking rate; when the weight ratio of coking oil slurry to Trinidad Lake bitumen is 2:3, the tack coat has the best performance.

[0061] Examples 7-8 and Comparative Examples 4-5

[0062] The preparation method of the tack coat oil is the same as in Example 1, except that the weight ratio (C) of nano-silicon hybrid resin to TPU and SBR was adjusted, as shown in Table 3.

[0063] The performance of the tack coat oils prepared in Examples 7-8 and Comparative Examples 4-5 was tested, and the test results are shown in Table 3.

[0064] Table 3

[0065] Example 1 Example 7 Example 8 Comparative Example 4 Comparative Example 5 Weight ratio (C) 4:2:1 3:1:1 5:3:3 3:2:4 2:3:2 Penetration depth / cm 1.7 1.5 1.4 1.2 1.0 Shear strength / MPa 1.947 1.683 1.826 1.439 1.275 Pull-out strength / MPa 1.212 0.910 1.095 0.762 0.634 60℃ Adhesion Rate / % 4.5 4.7 5.6 6.5 7.2

[0066] As can be seen from Table 3, when the weight ratio of nano-silicon hybrid resin to TPU and SBR is (3-5):(1-3):(1-3), the prepared tack coat has the advantages of large penetration depth, high shear strength and pull-out strength, and low sticking rate; when the weight ratio of nano-silicon hybrid resin to TPU and SBR is 4:2:1, the performance of the prepared tack coat is optimal.

[0067] Comparative Example 6

[0068] The preparation method of the tack coat oil is the same as in Example 1, except that: no nano-silicon hybrid resin is added as a modifier, and the weight ratio of TPU to SBR is 2:1.

[0069] Comparative Example 7

[0070] The preparation method of the tack coat oil is the same as in Example 1, except that TPU was not added as a modifier, and the nano-silicon hybrid resin and SBR were prepared in a weight ratio of 4:1.

[0071] Comparative Example 8

[0072] The preparation method of the tack coat oil is the same as in Example 1, except that SBR was not added as a modifier, and the weight ratio of nano-silicon hybrid resin to TPU is 4:2.

[0073] The performance of the tack coat oils prepared in Comparative Examples 6 to 8 was tested, and the test results are shown in Table 4.

[0074] Table 4

[0075] Example 1 Comparative Example 6 Comparative Example 7 Comparative Example 8 Penetration depth / cm 1.7 1.0 1.3 1.5 Shear strength / MPa 1.947 1.375 1.584 1.762 Pull-out strength / MPa 1.212 0.861 1.029 1.183 60℃ Adhesion Rate / % 4.5 5.3 4.8 4.6

[0076] As can be seen from Tables 3 and 4, only by using nano-silicon hybrid resin with TPU and SBR in a specific weight ratio as modifiers can high-performance tack coat oil be obtained.

[0077] Examples 9-10 and Comparative Examples 9-10

[0078] The preparation method of the tack coat oil is the same as in Example 1, except that the weight ratio (D) of heavy aromatic oil, dearomatic alkane solvent oil and light aromatic oil in the regenerator is adjusted, as shown in Table 5.

[0079] The performance of the tack coat oils prepared in Examples 9-10 and Comparative Examples 9-10 was tested, and the test results are shown in Table 5.

[0080] Table 5

[0081] Example 1 Example 9 Example 10 Comparative Example 9 Comparative Example 10 Weight percentage (D) 45 / 30 / 25 50 / 30 / 20 30 / 40 / 30 60 / 20 / 20 20 / 40 / 40 Penetration depth / cm 1.7 1.6 1.5 1.3 1.0 Shear strength / MPa 1.947 1.853 1.782 1.649 1.528 Pull-out strength / MPa 1.212 1.170 1.064 0.953 0.871 60℃ Adhesion Rate / % 4.5 4.5 4.4 4.2 4.3

[0082] As can be seen from Table 5, when the weight percentages of heavy aromatic oil, dearomatic alkane solvent oil, and light aromatic oil in the regenerator are 30-50%, 20-40%, and 20-40%, respectively, the resulting tack coat oil has the advantages of large penetration depth, high shear strength and pull-out strength, and low wheel sticking rate. When the weight percentages of heavy aromatic oil, dearomatic alkane solvent oil, and light aromatic oil in the regenerator are 45%, 30%, and 25%, respectively, the resulting tack coat oil has the best performance.

[0083] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A special tack coat oil for ultra-viscous, high-permeability reducing thin-layer coatings, characterized in that, Made from the following parts by weight of raw materials: 60 parts of oil slurry lake bitumen composition 5-8 parts of modifier 30-35 parts of regenerator 2-5 parts of surfactant Compatibilizer 0.6~1.2 parts; The oil slurry lake bitumen composition comprises coking oil slurry and Trinidad Lake bitumen, with a penetration of 30-50 dmm and a softening point greater than 60℃; the weight ratio of the coking oil slurry to Trinidad Lake bitumen is (1-3): (1-3); The modifier includes nano-silicon hybrid resin, TPU and SBR; the weight ratio of nano-silicon hybrid resin to TPU and SBR is (3~5): (1~3): (1~3); The regenerator is a high-boiling-point aromatic organic compound, including heavy aromatic oil, dearomatic solvent oil and light aromatic oil, with a relative molecular weight of 270~290, a distillation range of 200~280℃, and an aromatic content greater than 98%.

2. The special tack coat oil for ultra-viscous, high-permeability reducing thin-film coatings according to claim 1, characterized in that: The surfactants include nonionic penetrants and AB-type block polymeric surfactants.

3. The special tack coat oil for ultra-viscous, high-permeability reducing thin-film coatings according to claim 2, characterized in that: The weight ratio of the nonionic penetrant to the AB-type block polymeric surfactant is (1~2): (1~2).

4. The special tack coat oil for ultra-viscous, high-permeability reducing thin-film coatings according to claim 2, characterized in that: The nonionic penetrant is alkylphenol polyoxyethylene ether.

5. The special tack coat oil for ultra-viscous, high-permeability reducing thin-film coatings according to claim 2, characterized in that: The AB-type block polymeric surfactant is PBA-b-PDMAEA.

6. The special tack coat oil for ultra-viscous, high-permeability reducing thin-film coatings according to claim 1, characterized in that: The compatibilizer is one or a mixture of two of glycidyl methacrylate and vinyl resin.

7. The method for preparing the super-viscous, high-permeability reducing thin-film coating special tack coat oil according to any one of claims 1 to 6, characterized in that, Includes the following steps: A. Add the modifier to the regenerator, and shear to obtain the modified regenerated solution; B. Heat the oil slurry lake asphalt composition in a sealed container until it becomes a liquid flow, and add surfactant and compatibilizer in sequence. Shearing completes the pretreatment of the oil slurry lake asphalt composition. C. The modified recycled liquid prepared in step A and the oil slurry lake asphalt composition pretreated in step B are sheared and cured at 150~170℃ to obtain a special tack coat oil for ultra-viscous and high-permeability reducing thin-layer overlay.

8. The method for preparing the super-viscous, high-permeability reducing thin-film coating special tack coat oil according to claim 7, characterized in that: The modifier described in step A is added to the regenerator in the form of flakes or fine powder.

9. The method for preparing the super-viscous, high-permeability reducing thin-film coating special tack coat oil according to claim 7, characterized in that: The shearing described in step C is divided into two stages: the first stage of shearing is carried out in a closed container, and the second stage of shearing is carried out in an open container.

10. The application of the super-viscous, high-permeability reducing thin-layer tack coat oil according to any one of claims 1 to 6 in road construction.

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