Normal-temperature self-healing asphalt pavement crack pouring adhesive and preparation method thereof

Abstract

The invention relates to the technical field of crack pouring adhesives, in particular to a normal-temperature self-healing asphalt pavement crack pouring adhesive and a preparation method thereof. The method adopts a two-step method for preparation and comprises the following steps: firstly, preparing normal-temperature liquid asphalt from 100 parts by mass of 90 # matrix asphalt, 15-25 parts by mass of waste engine oil, 3-5 parts by mass of soybean oil methyl ester, 3-5 parts by mass of palm oil methyl ester and 2-3 parts by mass of a polystyrene butadiene copolymer (SBR latex); according to the crack pouring adhesive, the pressure-sensitive self-healing capsule is added on the basis of a conventional crack pouring adhesive, when an original crack expands due to stress change or generates a new crack due to low-temperature shrinkage, the concentrated stress at the tip of the crack reaches the critical fracture pressure of the capsule, and the capsule can directionally release a regenerant, so that the self-repairing of the crack pouring adhesive is realized; therefore, the aged crack pouring glue is activated, the crack repairing capability of the crack pouring glue is recovered, and the action aging of the crack pouring glue is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crack pouring glue, in particular to a normal-temperature self-healing asphalt pavement crack pouring glue and a preparation method thereof. BACKGROUND

[0002] Asphalt pavement is widely used in highway construction due to its high flatness, comfortable driving, and convenient construction. However, under the combined action of long-term driving load, temperature cycle change, and natural environment erosion, the pavement is prone to structural diseases such as cracks. The existence of cracks not only reduces the load-bearing capacity and driving safety of the pavement, but also causes rainwater to penetrate into the base, accelerates the aging and damage of the pavement, and shortens the service life of the pavement.

[0003] As the core material for repairing cracks in asphalt pavement, the performance of crack pouring glue directly determines the crack repair effect and pavement maintenance cost. The crack pouring glue on the market is mostly high-temperature type, which needs to be heated during use. Moreover, the existing crack pouring glue has obvious defects: it lacks continuous self-repairing ability after crack repair, and cannot actively respond to repair when the original crack expands due to stress change or new cracks occur due to low-temperature shrinkage, resulting in invalid repair effect and the need for frequent secondary or even multiple crack pouring treatment, which increases maintenance cost and traffic interference.

[0004] To solve the long-term repair problem of crack pouring glue, related technical fields try to introduce a self-healing mechanism. For example, some studies directly add a regenerating agent to the crack pouring glue, but the advance release of the regenerating agent will cause the high-temperature performance of the crack pouring glue to decrease, and the targeted repair when cracks occur cannot be achieved. Another technology uses a capsule to encapsulate the regenerating agent, but the capsule is mostly heat-sensitive, which has low response sensitivity in normal-temperature construction scenes, and the strength of the capsule wall material is not compatible with the crack pouring glue matrix, which is prone to premature rupture during construction or cannot rupture and release the core material in time when cracks occur, resulting in unstable self-healing effect.

[0005] Therefore, it is an urgent problem in the current asphalt pavement or airport pavement maintenance technical field to develop a crack pouring glue for asphalt pavement, which is convenient to construct at normal temperature and can accurately respond and achieve efficient self-healing when low-temperature cracks occur, and a preparation method thereof. SUMMARY

[0006] In view of the defects of the prior art, the present application aims to provide a normal-temperature self-healing asphalt pavement crack pouring glue and a preparation method thereof to solve the problems raised in the background.

[0007] The technical problem solved by the present application adopts the following technical solution: The present application provides a normal-temperature self-healing asphalt pavement crack pouring glue, which is prepared by a two-step method. First, a normal-temperature liquid asphalt is prepared, and then it is compounded with a self-healing capsule. The normal-temperature type liquid asphalt raw material comprises 100 parts of No. 90 base asphalt, 15-25 parts of waste engine oil, 3-5 parts of soybean oil methyl ester, 3-5 parts of palm oil methyl ester and 2-3 parts of polystyrene butadiene copolymer (SBR latex) by mass fraction. The ratio of the crack pouring glue product comprises 100 parts of normal-temperature type liquid asphalt and 6-8 parts of self-healing capsules by mass fraction.

[0008] Preferably, the penetration (25℃, 100g, 5s) of the No. 90 base asphalt is 80-100 (0.1mm), and the softening point is greater than or equal to 45℃; the waste engine oil is automobile waste engine oil treated by precipitation and filtration, and the kinematic viscosity (40℃) is 10-15 mm² / s.

[0009] Preferably, the flash point of the soybean oil methyl ester is greater than or equal to 110℃, and the flash point of the palm oil methyl ester is greater than or equal to 110℃; the SBR latex is carboxyl styrene butadiene latex, and the solid content is 40-50%, and the pH value is 7-9.

[0010] Preferably, the regenerating agent is a compound of waste lubricating oil refined regenerated oil and vegetable asphalt, and the mass ratio is 3:1, the viscosity (25℃) is 80-150 mPa·s, and the penetration (25℃) is greater than or equal to 300 (0.1mm).

[0011] Preferably, the polymer film coating material is a composite wall material of polymethyl methacrylate (PMMA) and ethyl cellulose, and the mass ratio is 2:1, and the wall material thickness is 8-12μm.

[0012] The application also provides a preparation method of the normal-temperature type self-healing asphalt pavement crack pouring glue. (1) Self-healing capsule pre-preparation: the regenerating agent is added into a high-speed emulsification stirring kettle, and stirred at 45-55℃ and 400-600r / min for 15-20min; the polymer film coating material solution is added dropwise, and reacted for 30-40min under the condition of stirring at 1200-1500r / min; after cooling, filtration, washing and vacuum drying, the pressure-sensitive self-healing capsules with a particle size of 80-120μm are obtained; (2) Preparation of normal-temperature type liquid asphalt: the No. 90 base asphalt is melted at 100-110℃, and the waste engine oil, soybean oil methyl ester and palm oil methyl ester are sequentially added under the condition of stirring at 300-500r / min; after stirring and fusion, the SBR latex is added, and stirred at 60-70℃ for 30-40min, and then cooled to room temperature; (3) Compound preparation of crack pouring glue product: the self-healing capsules are added into the normal-temperature type liquid asphalt under normal temperature, and stirred at 150-200r / min for 15-20min, and then the product is obtained.

[0013] Preferably, the critical break pressure of the self-healing capsule in step (1) is 0.3-0.8 MPa; and the SBR latex in step (2) is added drop by drop to avoid bubbles in the system.

[0014] Compared with the prior art, the present application has the following beneficial effects: 1. Significant target self-healing effect: The core innovation of the present application is the introduction of pressure-sensitive self-healing capsules. When cracks occur in the crack sealing glue due to temperature stress in a low temperature environment, the concentrated stress at the crack tip will quickly reach the critical break pressure of the capsule, prompting the capsule to release the internal regenerant accurately. The regenerant quickly penetrates and fills the cracks through capillary action, not only softening the hardened crack sealing glue matrix, but also supplementing the lost light components of asphalt, reconstructing its colloidal structure, restoring the bonding performance and deformation ability of the crack sealing glue, and achieving self-repair of the cracks. Through experimental verification, the 24h self-healing strength recovery rate of the crack sealing glue of the present application after cracking at-10℃ is more than 75%, and the service life is more than 50% higher than that of conventional crack sealing glue at room temperature.

[0015] 2. Excellent performance at room temperature: Through reasonable proportioning of No. 90 base asphalt, waste engine oil, soybean oil methyl ester and palm oil methyl ester, and modification with SBR latex, the prepared liquid asphalt has good fluidity and workability at room temperature, and can be directly crack sealed without heating, solving the problem of high energy consumption and easy scalding of traditional high-temperature crack sealing glue, and reducing the requirement for construction equipment. It is suitable for field and small maintenance engineering, and the construction efficiency is improved by more than 40%.

[0016] 3. Environmentally friendly and low cost: The use of waste engine oil as a softening component in the raw materials realizes the resource utilization of industrial waste, reduces the cost of raw materials, and reduces environmental pollution; the self-healing capsule uses PMMA-ethyl cellulose composite wall material, which is easy to obtain and has good coating effect, and the preparation cost of the capsule is reduced by about 30% compared with polyurethane wall material, which is conducive to large-scale production and application.

[0017] 4. Strong adaptability and good stability: The prepared crack sealing glue has high bonding strength with asphalt pavement base material, does not flow at room temperature and does not crack at low temperature, and has stable performance in the temperature range of-25℃ to 50℃; the self-healing capsule has excellent compatibility with the liquid asphalt matrix, and does not settle or agglomerate during storage, ensuring that the product shelf life can be more than 6 months. DETAILED DESCRIPTION

[0018] With reference to the specific embodiments below, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0019] The self-healing asphalt pavement crack pouring glue of the present embodiment is prepared by a two-step method, i.e., first preparing a normal-temperature liquid asphalt, and then compounding the normal-temperature liquid asphalt with a self-healing capsule. The raw materials of the normal-temperature liquid asphalt include 100 parts of No. 90 base asphalt, 15-25 parts of waste engine oil, 3-5 parts of soybean oil methyl ester, 3-5 parts of palm oil methyl ester, and 2-3 parts of polystyrene butadiene copolymer (SBR latex) by mass fraction. The ratio of the crack pouring glue product includes 100 parts of normal-temperature liquid asphalt and 6-8 parts of a self-healing capsule by mass fraction; the raw materials of the self-healing capsule include 100 parts of a regenerant and 15-20 parts of a polymer film coating material by mass fraction.

[0020] The No. 90 base asphalt of the present embodiment has a penetration (25℃, 100g, 5s) of 80-100 (0.1mm) and a softening point ≥ 45℃; the waste engine oil is automobile waste engine oil treated by sedimentation and filtration, and has a kinematic viscosity (40℃) of 10-15 mm 2 / s.

[0021] The soybean oil methyl ester of the present embodiment has a flash point ≥ 110℃, and the palm oil methyl ester has a flash point ≥ 110℃; the SBR latex is a carboxyl styrene-butadiene latex, and has a solid content of 40-50% and a pH value of 7-9.

[0022] The regenerant of the present embodiment is a compounded product of waste lubricating oil refined regenerated oil and vegetable pitch, and has a mass ratio of 3:1, a viscosity (25℃) of 80-150 mPa·s, and a penetration (25℃) ≥ 300 (0.1mm).

[0023] The polymer film coating material of the present embodiment is a composite wall material of polymethyl methacrylate (PMMA) and ethyl cellulose, and has a mass ratio of 2:1 and a wall material thickness of 8-12 μm.

[0024] The preparation method of the normal-temperature self-healing asphalt pavement crack pouring glue of the present embodiment includes the following steps: (1) Self-healing capsule pre-preparation: Add the regenerating agent into the high-speed emulsification stirring kettle, stir at 45-55℃ and 400-600r / min for 15-20min; drop the polymer film coating material solution and react for 30-40min under the stirring at 1200-1500r / min; after cooling, filter, wash and vacuum dry to obtain the pressure-sensitive self-healing capsule with a particle size of 80-120μm; (2) Preparation of normal-temperature type liquid asphalt: Melt the No. 90 base asphalt at 100-110℃, add the waste engine oil, soybean oil methyl ester and palm oil methyl ester successively under the stirring at 300-500r / min, add the SBR latex after the stirring and fusion, stir at 60-70℃ for 30-40min and cool to room temperature; (3) Product compounding of crack sealing glue: add the self-healing capsule into the normal-temperature type liquid asphalt at normal temperature and stir at 150-200r / min for 15-20min to obtain the product.

[0025] The critical break pressure of the self-healing capsule in step (1) of the embodiment is 0.3-0.8MPa; the SBR latex is added drop by drop in step (2) to avoid the generation of bubbles in the system.

[0026] Embodiment 1, a normal-temperature type self-healing asphalt pavement crack sealing glue and a preparation method thereof, the specific steps are as follows: 1. Self-healing capsule pre-preparation: select the refined regenerative oil of waste lubricating oil and vegetable asphalt (mass ratio 3:1) as the regenerating agent, take 100kg and add into the high-speed emulsification stirring kettle, stir at 50℃ and 500r / min for 18min; slowly drop 18kg of polymer film coating material (PMMA and ethyl cellulose mixed at 2:1, dissolved in anhydrous ethanol to a mass fraction of 30%) into the kettle, keep at 50℃, increase the speed to 1300r / min and react for 35min; after filtration, wash with ethanol for 3 times and vacuum dry at 50℃ for 5h to obtain the self-healing capsule with a particle size of 90-110μm and a critical break pressure of 0.5MPa.

[0027] 2. Preparation of normal-temperature type liquid asphalt: take 100kg of No. 90 base asphalt and add into the reaction kettle, heat and melt at 105℃ and stir at 400r / min; add 20kg of treated waste engine oil and stir for 12min; add 5kg of soybean oil methyl ester and 5kg of palm oil methyl ester and stir for 22min; finally add 2.5kg of SBR latex (solid content 45%), cool to 65℃, stir for 35min and cool to room temperature to obtain the normal-temperature liquid asphalt.

[0028] 3. Product compounding of crack sealing glue: take 100kg of normal-temperature liquid asphalt and add into the stirring tank, stir at 180r / min at 25℃; add 7kg of self-healing capsule and continuously stir for 18min to obtain the normal-temperature type self-healing asphalt pavement crack sealing glue.

[0029] Example 2, a normal-temperature self-healing asphalt pavement crack pouring glue and a preparation method thereof, the specific steps are as follows: 1. Self-healing capsule preparation: take 100 kg of regenerant, 45 DEG C, 400 r / min stirring 20 min; add 20 kg of composite wall material solution, 1200 r / min reaction 40 min; after drying, the self-healing capsule with a particle size of 100-120 μm and a critical breaking pressure of 0.8 MPa is obtained.

[0030] 2. Preparation of normal-temperature liquid asphalt: take 100 kg of No. 90 base asphalt, melt at 100 DEG C, 300 r / min stirring; add 25 kg of waste engine oil, stir for 15 min; add 6 kg of soybean oil methyl ester and 6 kg of palm oil methyl ester, stir for 25 min; add 3 kg of SBR latex, stir at 60 DEG C for 40 min, and cool for standby.

[0031] 3. Preparation of crack pouring glue: take 100 kg of normal-temperature liquid asphalt, 30 DEG C, 200 r / min stirring; add 8 kg of self-healing capsule, stir for 15 min, and obtain the finished crack pouring glue.

[0032] Example 3, a normal-temperature self-healing asphalt pavement crack pouring glue and a preparation method thereof, the specific steps are as follows: 1. Self-healing capsule preparation: take 100 kg of waste lubricating oil-plant asphalt regenerant, 55 DEG C, 600 r / min stirring 15 min; add 15 kg of PMMA-ethyl cellulose composite wall material solution, 1500 r / min reaction 30 min; after washing and drying, the self-healing capsule with a particle size of 80-100 μm and a critical breaking pressure of 0.3 MPa is obtained.

[0033] 2. Preparation of normal-temperature liquid asphalt: take 100 kg of No. 90 base asphalt, melt at 110 DEG C, 500 r / min stirring; add 15 kg of waste engine oil, stir for 10 min; add 4 kg of soybean oil methyl ester and 4 kg of palm oil methyl ester, stir for 20 min; add 2 kg of SBR latex, stir at 70 DEG C for 30 min, and cool to room temperature for standby.

[0034] 3. Preparation of crack pouring glue: take 100 kg of normal-temperature liquid asphalt, 20 DEG C, 150 r / min stirring; add 6 kg of self-healing capsule, stir for 20 min, and obtain the finished crack pouring glue.

[0035] In order to verify the beneficial effects of the product, the performance of the normal-temperature self-healing asphalt pavement crack pouring glue in examples 1-3 of the application is tested, and the results are shown in Table 1.

[0036]

[0037] From table 1, the normal temperature type self-healing asphalt pavement gap filling glue of the application has obvious advantages compared with conventional gap filling glue.

[0038] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics thereof. The presently disclosed embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

[0039] Furthermore, it should be understood that although the specification is described in terms of exemplary embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A normal temperature type self-healing asphalt pavement crack pouring glue, characterized in that, The crack pouring glue is prepared by a two-step method, first preparing a normal-temperature type liquid asphalt, and then compounding the normal-temperature type liquid asphalt with self-healing capsules; The normal-temperature type liquid asphalt raw material comprises, by mass fraction, 100 parts of No. 90 base asphalt, 15-25 parts of waste engine oil, 3-5 parts of soybean oil methyl ester, 3-5 parts of palm oil methyl ester, and 2-3 parts of polystyrene butadiene copolymer (SBR latex); The crack pouring glue product comprises, by mass fraction, 100 parts of normal-temperature type liquid asphalt and 6-8 parts of self-healing capsules; the self-healing capsule raw material comprises, by mass fraction, 100 parts of regenerant and 15-20 parts of polymer film coating material.

2. The normal temperature type self-healing asphalt pavement crack pouring glue according to claim 1, characterized in that, The 90# base pitch penetration (25℃, 100g, 5s) is 80-100 (0.1mm), and the softening point is ≥45℃; the waste engine oil is automobile waste engine oil treated by precipitation and filtration, and the kinematic viscosity (40℃) is 10-15 mm 2 / s.

3. The normal-temperature self-healing asphalt pavement crack pouring glue according to claim 1, characterized in that, The soybean oil methyl ester has a flash point of ≥110°C, and the palm oil methyl ester has a flash point of ≥110°C; the SBR latex is carboxyl styrene butadiene latex, has a solid content of 40-50%, and has a pH value of 7-9.

4. The normal-temperature self-healing asphalt pavement crack pouring glue according to claim 1, characterized in that, The regenerant is a compound of refined regenerated oil of waste lubricating oil and vegetable asphalt, has a mass ratio of 3:1, a viscosity (25°C) of 80-150 mPa·s, and a penetration (25°C) of ≥300 (0.1 mm).

5. The normal-temperature self-healing asphalt pavement crack pouring glue according to claim 1, characterized in that, The polymer film coating material is a composite wall material of polymethyl methacrylate (PMMA) and ethyl cellulose, has a mass ratio of 2:1, and has a wall material thickness of 8-12 μm.

6. The preparation method of the normal-temperature self-healing asphalt pavement crack pouring glue according to any one of claims 1-5, characterized in that, The method comprises the following steps: (1) Self-healing capsule pre-preparation: the regenerant is added to a high-speed emulsifying stirring kettle, stirred at 45-55°C and 400-600 r / min for 15-20 min, a polymer film coating material solution is added dropwise, and the reaction is carried out under stirring at a speed of 1200-1500 r / min for 30-40 min; after cooling, the product is filtered, washed, and vacuum dried to obtain pressure-sensitive self-healing capsules with a particle size of 80-120 μm; (2) Normal-temperature type liquid asphalt preparation: No. 90 base asphalt is melted at 100-110°C, waste engine oil, soybean oil methyl ester, and palm oil methyl ester are sequentially added under stirring at 300-500 r / min, SBR latex is added after the stirring and fusion, stirring is carried out at 60-70°C for 30-40 min, and cooling is carried out to room temperature; (3) Crack pouring glue product compounding: the self-healing capsules are added to the normal-temperature type liquid asphalt at room temperature, and stirring is carried out at 150-200 r / min for 15-20 min to obtain the product.

7. The preparation method according to claim 6, characterized in that, In step (1), the critical break pressure of the self-healing capsules is 0.3-0.8 MPa; in step (2), the SBR latex is added drop by drop to avoid the generation of bubbles in the system.

Images