Slow-breaking slow-setting emulsifying regenerant and preparation method thereof

Abstract

The invention discloses a slow-breaking slow-setting emulsification regenerant and a preparation method thereof, and relates to the technical field of emulsification regenerant preparation, in particular to a slow-breaking slow-setting emulsification regenerant which comprises base oil, a plasticizer, an anti-aging agent, an emulsifier and an additive, the base oil is rubber oil, the plasticizer is dimethyl phthalate, the anti-aging agent is an anti-aging agent, the emulsifier is an emulsifier, and the additive is an additive. The anti-aging agent is an oil soluble antioxidant. According to the slow-breaking and slow-setting emulsification regenerant and the preparation method thereof, the base oil, the plasticizer, the anti-aging agent, the emulsifier and the additive are selected as raw materials, the emulsification regenerant is prepared by virtue of an ultrasonic emulsifying machine, and the emulsification regenerant supplements a polymer obtained by decomposing asphalt, so that a stable net-shaped structure is re-formed in the emulsification regenerant; the low-temperature anti-cracking performance of the regenerated asphalt is improved, the molecular movement capability is reduced along with the reduction of the temperature, the molecular chain segment is confined, the molecular structure tends to be stable, and the low-temperature anti-cracking performance and the high-temperature anti-deformation performance of the regenerated asphalt are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of emulsified regenerant preparation, and specifically to a slow-cracking and slow-setting emulsified regenerant and a preparation method thereof. Background Art

[0002] During the process of pavement maintenance and upgrading of old roads, a large amount of waste asphalt mixture will be generated. If it is randomly stacked, it will not only occupy a large amount of land, but also cause waste of resources and environmental pollution. How to efficiently utilize waste asphalt mixture has received more and more attention. The hot in-place recycling technology of asphalt pavement can not only utilize the aggregates in the recycled asphalt mixture (RAP), but also reuse the asphalt in it, reduce the exploitation of mineral resources and the consumption of new asphalt, reduce the construction cost, and at the same time save energy and protect the environment.

[0003] When using the hot in-place recycling technology, the RAP content is often relatively high, and the recycled asphalt mixture is too hard to be compacted on site. The durability of the pavement after recycling is insufficient, and diseases such as cracks are likely to occur. At this time, a suitable regenerant needs to be added to change the performance of the asphalt mixture. The regenerant aims to restore the rheology of the aged asphalt binder by reducing the size of asphaltene clusters and increasing molecular mobility, thereby reducing the viscosity, stiffness and brittleness of the recycled asphalt binder and increasing its ductility, and then improving the performance of the recycled pavement.

[0004] At present, the commonly used asphalt regenerants on the market have relatively high viscosity at room temperature, are mainly applicable to the regeneration of matrix asphalt pavements, and generally have a general regeneration effect on the regeneration of aged styrene-butadiene-styrene triblock copolymer (SBS) modified asphalt pavements. Preheating is required during use, which not only wastes energy but also easily causes environmental pollution. Summary of the Invention

[0005] The present invention provides a slow-cracking and slow-setting emulsified regenerant and a preparation method thereof, which solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A slow-cracking and slow-setting emulsified regenerant, the emulsified regenerant includes base oil, plasticizer, anti-aging agent, emulsifier and additive, the base oil is rubber oil, the plasticizer is dimethyl phthalate, the anti-aging agent is an oil-soluble antioxidant, the emulsifier is a slow-cracking cationic emulsifier, and the additive is composed of a liquid modifier, a stabilizer and an anti-stripping agent.

[0007] Optionally, the liquid modifier is a miscible substance of dichloromethane and toluene.

[0008] Optionally, the stabilizer is one or more of strong acid and weak base salts, inorganic calcium salts, iron salts or magnesium salts.

[0009] Optionally, the anti-stripping agent is 2% hydrated lime or 0.05% metal soap.

[0010] A slow-cracking and slow-setting emulsified rejuvenator and its preparation method, comprising the following operating steps:

[0011] S1. Preparation of ordinary rejuvenator

[0012] First, place an empty beaker on an electronic analytical balance, then tare the balance and add rubber oil to the beaker until the balance shows that 75 kg of rubber oil has been weighed, then stop adding rubber oil, and keep the rubber oil warm under water bath conditions. Place the beaker containing the rubber oil in a constant temperature water bath.

[0013] Then, successively add 20 kg of plasticizer, 5 kg of antioxidant and anti-stripping agent mixture, and use a high-shear emulsifier to fully mix the materials and then perform shearing treatment.

[0014] Finally, wait until the mixture is fully mixed, and then the ordinary rejuvenator can be prepared.

[0015] S2. Preparation of soap solution

[0016] Weigh 30 kg of water and 2 kg of emulsifier, pour the emulsifier into the water, add a stabilizer and stir to obtain the soap solution.

[0017] S3. Preparation of emulsified rejuvenator

[0018] Weigh 68 kg of the ordinary rejuvenator in step S1 after being sheared by a high-shear emulsifier, pour the prepared soap solution in step S2 into the ordinary rejuvenator and stir. After stirring, add the mixture of the soap solution and the ordinary rejuvenator to an ultrasonic emulsifier for emulsification. After emulsification is completed, add a liquid modifier and stir evenly to obtain the emulsified rejuvenator.

[0019] Optionally, the temperature and time set for the water bath in step S1 are set to 75 °C and 30 min respectively.

[0020] Optionally, the temperature, rotation speed and time set for the high-shear emulsifier in step S1 are 75 °C, 1500 r / min and 40 min respectively.

[0021] Optionally, the emulsification time set for the ultrasonic emulsifier in step S3 is 2 min.

[0022] The present invention has the following beneficial effects:

[0023] 1. The slow-cracking and slow-setting emulsified rejuvenator and its preparation method prepare the emulsified rejuvenator by selecting base oil, plasticizer, anti-aging agent, emulsifier and additive as raw materials and using an ultrasonic emulsification mechanism. Since the emulsified rejuvenator replenishes the decomposed polymers of asphalt and enables a stable network structure to form again inside, its low-temperature anti-cracking performance is increased. As the temperature drops, the ability of molecular movement becomes lower, restricting the molecular chain segments. At this time, the molecular structure tends to be stable, improving the low-temperature anti-cracking performance and high-temperature deformation resistance of the recycled asphalt.

[0024] 2. The slow-cracking and slow-setting emulsified rejuvenator and its preparation method prepare the emulsified rejuvenator using an ultrasonic emulsification mechanism. It has good fluidity at room temperature and can be well blended with aged asphalt. Compared with ordinary rejuvenators, the emulsified rejuvenator saves the preheating process during use, is more energy-saving and environmentally friendly. At the same time, the emulsified rejuvenator contains some moisture, and the moisture is first evaporated during use, reducing the volatilization of the rejuvenator and improving the rejuvenation effect. Specific Embodiments

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] The present invention provides a technical solution: a slow-cracking and slow-setting emulsified rejuvenator, which includes base oil, plasticizer, anti-aging agent, emulsifier and additive. The base oil is rubber oil, the plasticizer is dimethyl phthalate, the anti-aging agent is an oil-soluble antioxidant, the emulsifier is a slow-cracking cationic emulsifier, and the additive is composed of a liquid modifier, a stabilizer and an anti-stripping agent.

[0027] The liquid modifier is a miscible substance of dichloromethane and toluene.

[0028] The stabilizer is one or more of strong acid and weak base salts, inorganic calcium salts, iron salts or magnesium salts.

[0029] The anti-stripping agent is 2% slaked lime or 0.05% metal soap.

[0030] A slow-cracking and slow-setting emulsified rejuvenator and its preparation method include the following operating steps:

[0031] S1. Preparation of ordinary rejuvenator

[0032] First, place an empty beaker on an electronic analytical balance. After taring the balance, add rubber oil to the beaker until the balance shows that the weight of the rubber oil is 75 kg. Then stop adding the rubber oil and keep the rubber oil warm under water bath conditions. Put the beaker containing the rubber oil into a constant temperature water bath. Among them, the electronic analytical balance is the most important instrument for accurate weighing. It adopts the electromagnetic balance method and can accurately weigh up to 0.0001 g (i.e., 0.1 mg) or more. And the constant temperature water bath is widely used in enterprises, medical units, universities, research departments and production units for evaporation, drying, concentration, and constant temperature heating. It is mainly used for distillation, drying, concentration, and soaking of chemical drugs or biological products in the laboratory. It can also be used for constant temperature heating and other temperature tests. It is an essential tool for biology, genetics, virology, aquaculture, environmental protection, medicine, health, laboratories, analysis rooms, education and scientific research;

[0033] Then, add 20 kg of plasticizer and a mixture of 5 kg of anti-aging agent and anti-stripping agent in sequence. Use a high-shear emulsifier to fully mix the materials and then perform shearing treatment. Among them, the high-shear emulsifier is a machine that can fully refine and homogenize the materials. Its name should come from a machine that can promote the mixing of oily substances (oil phase) and aqueous substances (water phase) and form a uniform emulsion. The high-shear emulsifier has the functions of refining, dispersing, and homogenizing, and is mainly used for liquid-liquid emulsification and homogenization, and the refinement and dispersion of liquid-solid (powder, small particles);

[0034] Finally, after the mixture is fully mixed, the ordinary regenerant can be prepared.

[0035] S2. Preparation of soap solution

[0036] Weigh 30 kg of water and mix it with 2 kg of emulsifier. Pour the emulsifier into the water and add a stabilizer and stir to obtain the soap solution.

[0037] S3. Preparation of emulsified regenerant

[0038] Weigh 68 kg of the ordinary regenerant in step S1 after being sheared by a high-shear emulsifier. Pour the prepared soap solution in step S2 into the ordinary regenerant and stir. After stirring, add the mixture of the soap solution and the ordinary regenerant to an ultrasonic emulsifier for emulsification. After emulsification is completed, add a liquid modifier and stir evenly to obtain the emulsified regenerant. Among them, ultrasonic emulsification refers to the mixing of two or more immiscible liquids under the action of ultrasonic energy, and one liquid is evenly dispersed in the other liquid to form an emulsion-like liquid. The working principle of the ultrasonic emulsifier is to convert electrical energy into ultrasonic energy by an ultrasonic transducer and form a series of dense small bubbles through the liquid medium. The energy generated by the explosion of the bubbles forms high temperature and high pressure locally, thereby realizing emulsification.

[0039] The temperature and time set for the water bath in step S1 are set to 75 °C and 30 min respectively.

[0040] The temperature, rotation speed and time set for the high-shear emulsifier in step S1 are 75 °C, 1500 r / min and 40 min respectively.

[0041] The emulsification time set for the ultrasonic emulsifier in step S3 is 2 min.

[0042] In the description of the present invention, it should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0043] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slow-cracking and slow-setting emulsified rejuvenator, characterized in that: The emulsified regenerant includes base oil, plasticizer, anti-aging agent, emulsifier and additive. The base oil is rubber oil, the plasticizer is dimethyl phthalate, the anti-aging agent is oil-soluble antioxidant, the emulsifier is slow-cracking cationic emulsifier, and the additive is composed of liquid modifier, stabilizer and anti-stripping agent.

2. The slow-cracking and slow-setting emulsified rejuvenator according to claim 1, characterized in that: The liquid modifier is a miscible substance of dichloromethane and toluene.

3. A slow-cracking and slow-setting emulsified rejuvenator according to claim 1, characterized in that: The stabilizer is one or several of strong acid and weak base salts, inorganic calcium salts, iron salts or magnesium salts.

4. The slow-cracking and slow-setting emulsified rejuvenator according to claim 1, wherein: The anti-stripping agent is 2% slaked lime or 0.05% metal soap.

5. A slow-cracking and slow-setting emulsified regenerant as claimed in any one of claims 1-4 and its preparation method, characterized in that, It includes the following operation steps: S1. Preparation of ordinary regenerant First, put an empty beaker into an electronic analytical balance, then tare the electronic analytical balance and add rubber oil into the beaker until the electronic analytical balance shows that the weighed weight of rubber oil is 75 kg, then stop adding rubber oil, and keep the rubber oil warm under water bath conditions. Put the beaker containing rubber oil into a constant temperature water bath. Then, sequentially put in 20 kg of plasticizer, a mixture of 5 kg of anti-aging agent and anti-stripping agent, and use a high-shear emulsifier to fully mix the materials and then carry out shearing treatment. Finally, after the mixture is fully mixed, the ordinary regenerant can be prepared. S2. Preparation of soap solution Weigh 30 kg of water and mix it with 2 kg of emulsifier. Pour the emulsifier into the water and add a stabilizer and stir to obtain the soap solution. S3. Preparation of emulsified regenerant Weigh 68 kg of the ordinary regenerant in step S1 after being sheared by a high-shear emulsifier. Pour the prepared soap solution in step S2 into the ordinary regenerant and stir. After stirring, add the mixture of soap solution and ordinary regenerant to an ultrasonic emulsifier for emulsification. After emulsification is completed, add the liquid modifier and stir evenly to obtain the emulsified regenerant.

6. The preparation method of a slow-cracking and slow-setting emulsified rejuvenator according to claim 5, characterized in that: The temperature and time set for the water bath in step S1 are set to 75 °C and 30 min respectively.

7. The preparation method of a slow-cracking and slow-setting emulsified rejuvenator according to claim 5, characterized in that: The temperature, rotation speed and time set for the high-shear emulsifier in step S1 are 75 °C, 1500 r / min and 40 min respectively.

8. A slow-cracking and slow-setting emulsified rejuvenator and its preparation method according to claim 5, characterized in that: The emulsification time set for the ultrasonic emulsifier in step S3 is 2 min.