Emulsified asphalt and preparation method thereof

Abstract

The invention relates to the technical field of emulsified asphalt, and particularly discloses emulsified asphalt and a preparation method thereof. The emulsified asphalt is prepared from the following components in parts by weight: 1000 parts of water, 1 to 3 parts of soap, 0.5 to 1 part of caustic soda, 2 to 4 parts of glass water, 0.5 to 1.5 parts of washing powder, 2 to 3 parts of lignosulfonate, 1 to 2 parts of alkylphenol polyoxyethylene phosphate, 0.2 to 0.6 part of potassium hydroxide, 400 to 600 parts of asphalt, 0.4 to 0.8 part of organic silicon defoaming agent, 0.2 to 0.4 part of polyether modified silicone oil, 1 to 1.5 parts of sodium carboxymethyl cellulose and 0.5 to 1 part of lauryl sodium sulfate. According to the invention, the soap, the caustic soda and the washing powder with optimized dosages are adopted to construct composite emulsification, the effect of reducing the oil-water interfacial tension is far better than that of a traditional single formula, and meanwhile, the emulsified asphalt is flatly and uniformly spread on a construction surface, so that the construction efficiency is improved, and the construction quality is improved. The base layer can be tightly attached, holes and pitted surfaces are avoided, and the construction efficiency and quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of emulsified asphalt, and particularly relates to emulsified asphalt and a preparation method thereof. Background Art

[0002] As an important material widely used in road construction, maintenance and building waterproofing, the performance of emulsified asphalt is directly related to the quality and life of the project. In road engineering, with the increasing traffic volume and vehicle load, higher requirements are placed on the wear resistance, skid resistance and waterproofness of the road surface.

[0003] The road coating formed by the traditional formula of emulsified asphalt is prone to early peeling and cracking due to the poor stability of the emulsified system, and cannot withstand the rolling of heavy vehicles and the erosion of complex climates for a long time. The same is true in the field of building waterproofing. The old emulsified asphalt formula is difficult to form a dense and durable waterproof layer on the surface of the building, resulting in a decrease in waterproofing effect year by year, and frequent repairs increase costs. Summary of the invention

[0004] The object of the present invention is to provide an emulsified asphalt and a preparation method thereof to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An emulsified asphalt and a preparation method thereof, comprising the following steps:

[0007] The invention comprises the following components in parts by weight: 1000 parts of water, 1-3 parts of soap, 0.5-1 parts of caustic soda, 2-4 parts of glass water, 0.5-1.5 parts of washing powder, 2-3 parts of lignin sulfonate, 1-2 parts of alkylphenol polyoxyethylene ether phosphate, 0.2-0.6 parts of potassium hydroxide, 400-600 parts of asphalt, 0.4-0.8 parts of organic silicon defoamer, 0.2-0.4 parts of polyether modified silicone oil, 1-1.5 parts of sodium carboxymethyl cellulose, 0.5-1 parts of sodium dodecyl sulfate, 0.3-0.7 parts of di-tert-butyl paracresol, 0.2-0.4 parts of benzotriazole, 0.8-1.2 parts of dibutyl phthalate and 0.1-0.3 parts of nano titanium dioxide. The glass water comprises ethanol, ethylene glycol, water and a surfactant, and the washing powder has a sodium alkylbenzene sulfonate content of not less than 15%.

[0008] Preferably, it comprises the following components in parts by weight: 1000 parts of water, 2 parts of soap, 0.8 parts of caustic soda, 3 parts of glass water, 1 part of washing powder, 2.5 parts of lignin sulfonate, 1.5 parts of alkylphenol polyoxyethylene ether phosphate, 0.4 parts of potassium hydroxide, 550 parts of asphalt, 0.6 parts of organosilicon defoamer, 0.3 parts of polyether modified silicone oil, 1.2 parts of sodium carboxymethyl cellulose (CMC), 0.7 parts of sodium dodecyl sulfate, 0.5 parts of di-tert-butylparacresol (BHT), 0.3 parts of benzotriazole, 1 part of dibutyl phthalate (DBP) and 0.2 parts of nano titanium dioxide.

[0009] A method for preparing emulsified asphalt comprises the following steps:

[0010] S1. Raw material pretreatment

[0011] Measure 1000 parts of water and add it to the BDS-2-5000 reactor. Turn on the stirring device and set the low speed stirring to 100-150 rpm. Preheat the reactor and slowly raise the water temperature to 30-35℃. Cut 1-3 parts of soap mainly made of sodium salt of fatty acids obtained by saponification of butter into pieces and put them into a small amount of hot water preheated to 40-50℃. Stir until completely dissolved to form a soap solution for later use. Add 0.5-1 parts of caustic soda, 2-3 1-2 parts of lignin sulfonate, 1-2 parts of alkylphenol polyoxyethylene ether phosphate, 0.2-0.6 parts of potassium hydroxide, 1-1.5 parts of sodium carboxymethyl cellulose (CMC), 0.5-1 parts of sodium lauryl sulfate, 0.3-0.7 parts of di-tert-butyl-p-cresol (BHT), 0.2-0.4 parts of benzotriazole, 0.8-1.2 parts of dibutyl phthalate (DBP) and 0.1-0.3 parts of nano titanium dioxide, respectively passed through 80-100 mesh sieve;

[0012] S2. Preparation of aqueous phase

[0013] When the water temperature in the reactor reaches 30-35°C, sprinkle 0.5-1.5 parts of washing powder into the reactor and stir for 3-5 minutes. Then pour the prepared soap solution into the reactor and add 2-4 parts of glass water at the same time. Increase the stirring speed to 200-250 rpm and stir for 10-15 minutes. Under continuous stirring, slowly add 0.5-1 part of caustic soda into the reactor, adjust the pH value of the system to 9-11, then add 2-3 parts of lignin sulfonate and 1-2 parts of alkylphenol polyoxyethylene ether phosphate in sequence, and continue stirring for 15-20 minutes to fully dissolve the emulsifier and evenly disperse it in the water phase.

[0014] S3. Asphalt heating and emulsification

[0015] Heat 400-600 parts of asphalt to 120-130°C in a hot container, pour the preheated asphalt into the prepared water phase system, increase the stirring speed of the reactor to 400-600 rpm, perform strong shear emulsification, and maintain the emulsification time at 15-20 minutes to break the asphalt into tiny particles and evenly disperse them in the water phase.

[0016] S4. Addition and improvement of additives

[0017] After emulsification is completed, reduce the stirring speed to 250-300 rpm, add 0.4-0.8 parts of silicone defoamer and 0.2-0.4 parts of polyether modified silicone oil in sequence, and control the addition time to 5-8 minutes to evenly mix the two into the system. Then, slowly sprinkle 1-1.5 parts of sodium carboxymethyl cellulose (CMC) into the reactor and stir for 10-15 minutes, then add 0.5-1 parts of sodium dodecyl sulfate and stir for 5-8 minutes to produce fine foam. Finally, add 0.3-0.7 parts of di-tert-butyl-p-cresol (BHT), 0.2-0.4 parts of benzotriazole, 0.8-1.2 parts of dibutyl phthalate (DBP) and 0.1-0.3 parts of nano titanium dioxide into the reactor in sequence, and continue stirring for 10-15 minutes.

[0018] S5, cooling and discharging

[0019] Turn off the reactor heating device and open the jacket cooling circulating water to slowly cool down the emulsified asphalt system. The cooling rate is controlled at 2-3°C per minute until the temperature drops to 30-40°C. After the temperature reaches the standard, open the reactor discharge valve and transfer the prepared emulsified asphalt to the storage container for sealed storage.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention introduces lignin sulfonate and alkylphenol polyoxyethylene ether phosphate emulsifier, and is matched with optimized amounts of soap, caustic soda, and washing powder to construct a composite emulsification, which reduces the oil-water interfacial tension effect far beyond the traditional single formula, and the emulsified asphalt particles formed are evenly distributed, not easy to aggregate, and can still maintain a stable emulsion state after being stored for several months, reducing transportation and storage losses. At the same time, the organosilicon defoamer and polyether-modified silicone oil are integrated into functional glass water, successfully eliminating the bubbles generated during stirring and paving, and the foam-stabilizing filling effect produced by sodium dodecyl sulfate is combined to allow the emulsified asphalt to be smoothed and evenly spread on the construction surface. Whether it is road brushing or building roof smearing, it can fit closely to the base layer, avoid holes and pockmarks, and improve construction efficiency and quality. And the formula of the present invention is used for construction, which can resist long-term weathering and erosion, significantly extend the service life of the project, and reduce the later maintenance cost. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] An emulsified asphalt comprises the following raw materials accurately weighed: 1000 parts of water, 2 parts of soap mainly composed of sodium salt of fatty acid obtained by saponifying butter, 0.8 parts of caustic soda, 3 parts of glass water, 1 part of washing powder, 2.5 parts of lignin sulfonate, 1.5 parts of alkylphenol polyoxyethylene ether phosphate, 0.4 parts of potassium hydroxide, 550 parts of asphalt, 0.6 parts of organosilicon defoamer, 0.3 parts of polyether modified silicone oil, 1.2 parts of sodium carboxymethyl cellulose (CMC), 0.7 parts of sodium dodecyl sulfate, 0.5 parts of di-tert-butyl-p-cresol (BHT), 0.3 parts of benzotriazole, 1 part of dibutyl phthalate (DBP) and 0.2 parts of nano titanium dioxide.

[0025] Choose the "Seiko Huazhiyi 1-ton reactor" and check all parts of the reactor in advance to ensure that the agitator runs smoothly, the heating and cooling devices work normally, and the seal is good without leakage; prepare a "Wangtong WT-6" emulsified asphalt colloid mill and debug it to be ready for use at any time; prepare a screw pump for conveying asphalt and finished emulsified asphalt.

[0026] A method for preparing emulsified asphalt:

[0027] Aqueous phase preparation

[0028] Add 1000 parts of water to the reactor, turn on the stirring device, adjust to 120 rpm, and heat the water to 32°C. Cut 2 parts of soap into small pieces, put into 50 parts of 45°C hot water and stir to dissolve to obtain a soap solution. Sprinkle 1 part of washing powder into the reactor and stir for 4 minutes; pour in the soap solution and 3 parts of glass water, increase the speed to 220 rpm, and stir for 12 minutes. Slowly add 0.8 parts of caustic soda, adjust the pH to 10, then add 2.5 parts of lignin sulfonate and 1.5 parts of alkylphenol polyoxyethylene ether phosphate in turn, maintain the speed and stir for another 18 minutes.

[0029] Asphalt emulsification

[0030] In another heating container, 550 parts of asphalt were heated to 125°C and stirred continuously. The preheated asphalt was slowly pumped into the water phase system of the reactor in a thin stream through a screw pump. At the same time, the stirring speed of the reactor was increased to 500 rpm and strong shear emulsification was performed for 18 minutes.

[0031] Additives

[0032] After emulsification is completed, reduce the speed to 280 rpm, and add 0.6 parts of silicone defoamer and 0.3 parts of polyether modified silicone oil in sequence. Add all within 5 minutes while stirring.

[0033] Next, slowly sprinkle 1.2 parts of CMC and stir for 12 minutes until swelling; then add 0.7 parts of sodium dodecyl sulfate and stir for 6 minutes.

[0034] Finally, 0.5 parts of BHT, 0.3 parts of benzotriazole, 1 part of DBP, and 0.2 parts of nano-titanium dioxide were added in sequence, and stirring was continued for 12 minutes.

[0035] Cooling and discharging

[0036] Turn off the reactor heating, turn on the jacket cooling circulating water, and cool down to 35°C at a rate of 2.5°C per minute.

[0037] Use a screw pump to transfer the emulsified asphalt to a storage container, seal it and store it for subsequent quality testing, such as testing whether key indicators such as the particle size distribution, storage stability, and demulsification rate of the emulsified asphalt meet the standards.

[0038] Implementation 2:

[0039] Raw material preparation

[0040] According to the formula, weigh the raw materials accurately: 1000 parts of water, 3 parts of soap mainly composed of sodium salt of fatty acid obtained by saponification of butter, 0.5 parts of caustic soda, 4 parts of glass water, 0.5 parts of washing powder, 3 parts of lignin sulfonate, 1 part of alkylphenol polyoxyethylene ether phosphate, 0.2 parts of potassium hydroxide, 600 parts of asphalt, 0.8 parts of organosilicon defoamer, 0.2 parts of polyether modified silicone oil, 1 part of sodium carboxymethyl cellulose (CMC), 0.5 parts of sodium dodecyl sulfate, 0.7 parts of di-tert-butyl-p-cresol (BHT), 0.2 parts of benzotriazole, 1.2 parts of dibutyl phthalate (DBP), and 0.1 parts of nano titanium dioxide. All raw materials must be of qualified quality and free from moisture and deterioration.

[0041] Pass the weighed lignin sulfonate, alkylphenol polyoxyethylene ether phosphate, sodium carboxymethyl cellulose (CMC), di-tert-butyl-p-cresol (BHT), benzotriazole, dibutyl phthalate (DBP), and nano-titanium dioxide through an 80-mesh sieve; chop the soap into small pieces with a side length of about 1 cm for later use.

[0042] Equipment preparation

[0043] Select the Bondes BDS-2-5000 reactor, start the equipment preheating mode in advance, set the preheating temperature to 30℃, check whether the temperature sensor, stirring motor, heating device, valve and other key components of the reactor are operating normally to ensure good sealing. Prepare a JM-20 emulsified asphalt colloid mill, connect the power supply, and run it for 3 minutes without load; prepare the screw pump, check the internal structure of the pump body, connect the delivery pipeline, and ensure that the pipeline is unobstructed.

[0044] A method for preparing emulsified asphalt comprises the following steps:

[0045] Aqueous phase preparation

[0046] Pour 1000 parts of water into the preheated reactor, start stirring, set the speed to 100 rpm, then turn on the heating system to slowly raise the water temperature to 30°C. Add 3 parts of chopped soap into 80 parts of 40°C hot water, stir quickly for 5 minutes with a small stirrer until the soap is completely dissolved to form a clear solution, and pour it into the reactor.

[0047] Sprinkle 0.5 parts of washing powder into the reactor, maintain stirring at 100 rpm, stir for 3 minutes, add 4 parts of glass water, increase the stirring speed to 200 rpm, and continue stirring for 10 minutes to allow the ingredients to be initially mixed. Then, slowly add 0.5 parts of caustic soda, use a pH meter to monitor in real time, and accurately adjust the pH value of the system to 9. Subsequently, add 3 parts of lignin sulfonate and 1 part of alkylphenol polyoxyethylene ether phosphate after screening into the reactor in turn, maintain a stirring speed of 200 rpm, stir for 15 minutes, and obtain a uniform aqueous phase.

[0048] Asphalt emulsification

[0049] 600 parts of asphalt are heated in a special heating kettle, gradually increasing the temperature from room temperature to 130°C at a heating rate of 5°C per minute, with continuous mechanical stirring during the process to ensure that the asphalt is heated evenly and has good fluidity. The high-temperature asphalt is slowly transported to the reactor using a screw pump, with the delivery flow rate controlled at 2 liters per minute. At the same time, the stirring speed of the reactor is quickly increased to 600 rpm for strong shear emulsification, which is maintained for 20 minutes until the asphalt is dispersed into tiny, uniform particles and integrated into the water phase system.

[0050] Additives

[0051] After completing the initial emulsification, reduce the stirring speed to 250 rpm, first slowly add 0.8 parts of silicone defoamer into the reactor, and control the addition time to 3 minutes. Then add 0.2 parts of polyether modified silicone oil and stir for another 5 minutes to eliminate the bubbles generated during the emulsification process and optimize the leveling of the emulsion.

[0052] Evenly sprinkle 1 part of sodium carboxymethyl cellulose (CMC) into the reactor, maintain stirring at 250 rpm for 10 minutes to allow it to fully swell and stabilize the emulsion structure. Then, add 0.5 parts of sodium dodecyl sulfate and continue stirring for 8 minutes to produce fine foam to help improve the performance of the emulsion.

[0053] Finally, add 0.7 parts of di-tert-butylparacresol (BHT), 0.2 parts of benzotriazole, 1.2 parts of dibutyl phthalate (DBP) and 0.1 parts of nano titanium dioxide into the reactor in turn, keep the stirring speed unchanged, and stir for 15 minutes to allow these functional ingredients to be evenly dispersed in the emulsified asphalt system.

[0054] Cooling and discharging

[0055] Turn off the reactor heating device, turn on the jacket cooling water, set the cooling rate to 3°C per minute, and let the emulsified asphalt system cool down gradually. During this period, continue stirring and maintain a speed of 200 rpm. When the temperature drops to 40°C, turn off the stirring device, use a screw pump to transport the emulsified asphalt to a clean and dry storage tank, seal the storage tank mouth, attach a label, indicate the product batch, production date and other information, and wait for subsequent quality inspection and application. Subsequent quality inspection items may include key indicators such as emulsion stability, evaporation residue content, and sieve residue.

[0056] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An emulsified asphalt, characterized in that: The invention comprises the following components in parts by weight: 1000 parts of water, 1-3 parts of soap, 0.5-1 parts of caustic soda, 2-4 parts of glass water, 0.5-1.5 parts of washing powder, 2-3 parts of lignin sulfonate, 1-2 parts of alkylphenol polyoxyethylene ether phosphate, 0.2-0.6 parts of potassium hydroxide, 400-600 parts of asphalt, 0.4-0.8 parts of organic silicon defoamer, 0.2-0.4 parts of polyether modified silicone oil, 1-1.5 parts of sodium carboxymethyl cellulose, 0.5-1 parts of sodium dodecyl sulfate, 0.3-0.7 parts of di-tert-butyl paracresol, 0.2-0.4 parts of benzotriazole, 0.8-1.2 parts of dibutyl phthalate and 0.1-0.3 parts of nano titanium dioxide. The glass water comprises ethanol, ethylene glycol, water and a surfactant, and the washing powder has a sodium alkylbenzene sulfonate content of not less than 15%.

2. An emulsified asphalt according to claim 1, characterized in that: It comprises the following components by weight: The invention relates to 1000 parts of water, 2 parts of soap, 0.8 parts of caustic soda, 3 parts of glass water, 1 part of washing powder, 2.5 parts of lignin sulfonate, 1.5 parts of alkylphenol polyoxyethylene ether phosphate, 0.4 parts of potassium hydroxide, 550 parts of asphalt, 0.6 parts of organosilicon defoamer, 0.3 parts of polyether modified silicone oil, 1.2 parts of sodium carboxymethyl cellulose (CMC), 0.7 parts of sodium dodecyl sulfate, 0.5 parts of di-tert-butyl-p-cresol (BHT), 0.3 parts of benzotriazole, 1 part of dibutyl phthalate (DBP) and 0.2 parts of nano titanium dioxide.

3. The method for preparing emulsified asphalt according to claim 1, characterized in that: The following steps are involved: S1. Raw material pretreatment Measure 1000 parts of water and add it to the BDS-2-5000 reactor. Turn on the stirring device and set the low speed stirring to 100-150 rpm. Preheat the reactor and slowly raise the water temperature to 30-35℃. Cut 1-3 parts of soap mainly made of sodium salt of fatty acids obtained by saponification of butter into pieces and put them into a small amount of hot water preheated to 40-50℃. Stir until completely dissolved to form a soap solution for later use. Add 0.5-1 parts of caustic soda, 2-3 1-2 parts of lignin sulfonate, 1-2 parts of alkylphenol polyoxyethylene ether phosphate, 0.2-0.6 parts of potassium hydroxide, 1-1.5 parts of sodium carboxymethyl cellulose (CMC), 0.5-1 parts of sodium lauryl sulfate, 0.3-0.7 parts of di-tert-butyl-p-cresol (BHT), 0.2-0.4 parts of benzotriazole, 0.8-1.2 parts of dibutyl phthalate (DBP) and 0.1-0.3 parts of nano titanium dioxide, respectively passed through 80-100 mesh sieve; S2. Preparation of aqueous phase When the water temperature in the reactor reaches 30-35°C, sprinkle 0.5-1.5 parts of washing powder into the reactor and stir for 3-5 minutes. Then pour the prepared soap solution into the reactor and add 2-4 parts of glass water at the same time. Increase the stirring speed to 200-250 rpm and stir for 10-15 minutes. Under continuous stirring, slowly add 0.5-1 part of caustic soda into the reactor, adjust the pH value of the system to 9-11, then add 2-3 parts of lignin sulfonate and 1-2 parts of alkylphenol polyoxyethylene ether phosphate in sequence, and continue stirring for 15-20 minutes to fully dissolve the emulsifier and evenly disperse it in the water phase. S3. Asphalt heating and emulsification Heat 400-600 parts of asphalt to 120-130°C in a hot container, pour the preheated asphalt into the prepared water phase system, increase the stirring speed of the reactor to 400-600 rpm, perform strong shear emulsification, and maintain the emulsification time at 15-20 minutes to break the asphalt into tiny particles and evenly disperse them in the water phase. S4. Addition and improvement of additives After emulsification is completed, reduce the stirring speed to 250-300 rpm, add 0.4-0.8 parts of silicone defoamer and 0.2-0.4 parts of polyether modified silicone oil in sequence, and control the addition time to 5-8 minutes to evenly mix the two into the system. Then, slowly sprinkle 1-1.5 parts of sodium carboxymethyl cellulose (CMC) into the reactor and stir for 10-15 minutes, then add 0.5-1 parts of sodium dodecyl sulfate and stir for 5-8 minutes to produce fine foam. Finally, add 0.3-0.7 parts of di-tert-butyl-p-cresol (BHT), 0.2-0.4 parts of benzotriazole, 0.8-1.2 parts of dibutyl phthalate (DBP) and 0.1-0.3 parts of nano titanium dioxide into the reactor in sequence, and continue stirring for 10-15 minutes. S5, cooling and discharging Turn off the reactor heating device and open the jacket cooling circulating water to slowly cool down the emulsified asphalt system. The cooling rate is controlled at 2-3°C per minute until the temperature drops to 30-40°C. After the temperature reaches the standard, open the reactor discharge valve and transfer the prepared emulsified asphalt to the storage container for sealed storage.