Emulsified asphalt and preparation method thereof
By optimizing the raw material composition and process of emulsified asphalt, the problems of high energy consumption and poor storage stability have been solved, achieving efficient and environmentally friendly emulsification of emulsified asphalt production and improving its adhesion to aggregates.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-09
- Publication Date
- 2026-04-07
AI Technical Summary
Existing emulsified asphalt production suffers from high energy consumption, excessively high emulsification temperatures leading to asphalt boiling, poor storage stability, and poor adhesion to aggregates. Furthermore, traditional surfactants are harmful to the environment and human health, and their emulsification effect is insufficient.
By employing a combination of asphalt, heavy oil, anti-rutting masterbatch, bio-based diluent, emulsifier, pH adjuster, and stabilizer, and by controlling the type and dosage of each raw material, especially by using terpene unsaturated compounds and N-cocoyl-1,3-propanediamine, the emulsification process is optimized, viscosity is reduced, and interfacial film strength and stability are improved.
It significantly improves the emulsification effect of emulsified asphalt, extends storage time, enhances its bonding ability with aggregates, and reduces production energy consumption and environmental harm.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of asphalt emulsification, and more particularly to an emulsified asphalt and a preparation method thereof. BACKGROUND
[0003] The emulsified asphalt has good penetration effect and adhesion, the asphalt content of the emulsified asphalt can be adjusted at will, the mixing is more uniform, the asphalt film is very thin, the surface of the emulsified asphalt has a charge, asphalt particles can be closely adsorbed to the surface of the mineral aggregate, the emulsifier simultaneously plays a role of anti-stripping agent, the adhesion between the asphalt and the stone can be enhanced, and thus the road quality is improved.
[0004] However, the emulsified asphalt has the following disadvantages in production: (1) higher temperature is needed to reduce the viscosity during emulsification, and more energy is consumed; (2) a colloid mill with higher strength is needed to improve the emulsification effect; and (3) the emulsification temperature is too high, which can cause the emulsified asphalt to boil and vaporize, and the storage stability of the emulsified asphalt is poor and deteriorated.
[0005] In the related art, the emulsification effect is improved by adding a quaternary amine salt surfactant and a non-ionic surfactant in asphalt, but the non-ionic surfactant can produce dioxane in the production process, which can cause harm to the environment and the human body, and meanwhile, the emulsified asphalt produced by using the emulsifier has poor storage stability and poor adhesion to stone, and the emulsification capacity of the emulsifier compounded by using the quaternary amine salt surfactant and the non-ionic surfactant is insufficient, which limits the application of the emulsifier in actual production. SUMMARY
[0006] In order to improve the emulsification effect of the emulsified asphalt, the present application provides an emulsified asphalt and a preparation method thereof.
[0007] In a first aspect, the present application provides an emulsified asphalt, which adopts the following technical scheme: An emulsified asphalt comprises the following raw materials by weight: 400-600 parts of asphalt, 8-14 parts of heavy oil, 100-150 parts of anti-rutting masterbatch, 1-9 parts of bio-based diluent, 0.5-4 parts of emulsifier, 0.2-5 parts of pH regulator, and 400-500 parts of water; the asphalt is any one of anti-rutting masterbatch modified asphalt or SBS modified asphalt; the bio-based diluent is a terpene-based unsaturated compound; and the terpene-based unsaturated compound is at least one of acyclic monoterpene, monocyclic monoterpene and bicyclic monoterpene.
[0008] The emulsified asphalt of the present application comprises the following raw materials by weight, including the following raw materials by weight, asphalt 400-600 parts, heavy oil 8-14 parts, anti-rutting master batch 100-150 parts, bio-based diluent 1-9 parts, emulsifier 0.5-4 parts, pH regulator 0.2-5 parts, water 400-500 parts; the raw materials can be any value within their respective ranges, and all can improve the emulsification effect of the emulsified asphalt.
[0009] Asphalt and water are the basic raw materials of the oil-water mixture of emulsified asphalt; heavy oil has good compatibility with high molecular polymers in asphalt, heavy oil is composed of aromatic hydrocarbons, saturated hydrocarbons, polar substances, and asphalt olefins, and can be used as a physical softening agent to weaken the intermolecular forces of asphalt and improve the flowability of asphalt; the emulsifier can reduce the interfacial tension between the oil and water of the asphalt emulsion and improve the strength of the interfacial film, so that the asphalt is more easily dispersed in water; the pH regulator can improve the emulsification effect. Anti-rutting master batch modified asphalt and SBS (styrene-butadiene-styrene block copolymer) modified asphalt have good compatibility and melting dispersibility, which strengthens the interaction between the asphalt mixture and plays a skeleton effect on the structure of the asphalt mixture.
[0010] The bio-based diluent can be well compatible with asphalt, can reduce the viscosity of asphalt and modified asphalt emulsion at a lower temperature, improve the emulsification effect, and will volatilize with water during the demulsification and molding process of the emulsified asphalt, without affecting the material properties and road performance of the final evaporation residue.
[0011] In addition, the present application selects terpene unsaturated compounds, i.e. acyclic monoterpene, monocyclic monoterpene and bicyclic monoterpene, which can improve the emulsification effect of the emulsified asphalt in single or combined use.
[0012] As a preferred embodiment, the terpene unsaturated compound is limonene or α-pinene.
[0013] By adopting the above technical solution, limonene or α-pinene has no harmful and irritating odor when it volatilizes, which is harmless to construction personnel and road users, and has certain corrosion resistance, which can protect the bio-based mixture from corruption or deterioration, not only improves the emulsification effect of the emulsified asphalt, but also prolongs the storage time.
[0014] As a preferred embodiment, the weight ratio of the asphalt and the bio-based diluent is (90-100):1.
[0015] By adopting the above technical solution, the weight ratio of the asphalt and the bio-based diluent is controlled to be (90-100):1, which can further improve the emulsification effect of the emulsified asphalt.
[0016] As a preferred embodiment, the emulsified asphalt further comprises 5-19 parts by weight of a stabilizer.
[0017] By adopting the technical scheme, the emulsified asphalt is added with a stabilizer to reduce the surface tension when the asphalt particles are close to water, prevent oil-water separation, and improve stability, so that the emulsification effect of the emulsified asphalt can be further improved.
[0018] Preferably, the stabilizer is 20-30% organic stabilizer and 70-80% inorganic stabilizer by mass of the total stabilizer.
[0019] By adopting the technical scheme, the inorganic stabilizer can enhance the double-layer effect around the emulsion particles, the double-layer effect increases the repulsive force between the particles, reduces the agglomeration trend of the particles, thereby improving the stability of the emulsified asphalt and enhancing the binding capacity of the aggregate; the organic stabilizer can form a protective film on the surface of the asphalt particles, improve the consistency of the emulsion, prevent the movement of the asphalt particles, and reduce the opportunity of particle collision and agglomeration, thereby achieving the purpose of stability; too high a content of the inorganic stabilizer can affect the ductility of the emulsified asphalt, and too high a content of the organic stabilizer can make the viscosity of the emulsifier aqueous solution too large, and the use of the inorganic emulsifier can improve the emulsification effect of the emulsified asphalt.
[0020] Preferably, the emulsified asphalt raw material further comprises 0.1-3 parts by weight of N-coco-1,3-propanediamine.
[0021] By adopting the technical scheme, the addition of N-coco-1,3-propanediamine and the emulsifier together can further reduce the interfacial tension between the oil and water of the asphalt emulsion, improve the strength of the interfacial film, make the asphalt more easily dispersed in water, and further improve the emulsification effect of the emulsified asphalt.
[0022] Preferably, the weight ratio of the emulsifier and N-coco-1,3-propanediamine is (2-3):1.
[0023] By adopting the technical scheme, the asphalt is further improved to be more easily dispersed in water, thereby improving the emulsification effect of the emulsified asphalt.
[0024] In a second aspect, the application provides a preparation method of any of the above emulsified asphalt.
[0025] A preparation method of emulsified asphalt, comprising the following steps: S1, heating and melting the asphalt, adding heavy oil, and stirring at 300-700 rad / min for 3-10 min; S2, after the temperature of the mixture in S1 is reduced to below 50℃, adding a bio-based diluent and stirring uniformly; S3, adding an emulsifier, a pH regulator, water and other reagents to the mixture in S2, and stirring at 500-1000 rad / min for 10-30 min to obtain emulsified asphalt.
[0026] In summary, this application includes at least one of the following beneficial technical effects: (1) This application improves the emulsification effect of asphalt by adjusting the weight ratio of asphalt and bio-based diluent to obtain emulsified asphalt with particle size, 1-day stability and 5-day stability of 8.48-8.90 μm, 0.52-0.58% and 1.86-1.96% respectively.
[0027] (2) This application improves the emulsification effect of asphalt by incorporating stabilizers into emulsified asphalt raw materials and controlling the type and amount of stabilizers. The particle size, 1-day stability and 5-day stability of the obtained emulsified asphalt are 7.10-7.48 μm, 0.31-0.37% and 1.52-1.61% respectively.
[0028] (3) This application improves the emulsification effect of asphalt by incorporating N-coco-1,3-propanediamine into the emulsified asphalt raw material and adjusting the amount of N-coco-1,3-propanediamine. The particle size, 1-day stability and 5-day stability of the obtained emulsified asphalt are 5.72-6.41 μm, 0.11-0.21% and 1.17-1.34% respectively.
[0029] (4) This application improves the emulsification effect of asphalt by using limonene or α-pinene as the bio-based diluent in the emulsified asphalt raw material, so that the particle size, 1-day stability and 5-day stability of the obtained emulsified asphalt are 5.37 μm, 0.06% and 1.09% respectively.
[0030] Therefore, by adjusting the types and amounts of each raw material, the pH value and viscosity of the emulsified asphalt obtained in this application remain basically unchanged, but the particle size, 1-day stability and 5-day stability of the emulsified asphalt are the lowest at 5.37 μm, 0.06% and 1.09% respectively, which significantly improves the emulsification effect. Detailed Implementation
[0031] The present application will be further described in detail below with reference to specific embodiments.
[0032] The following raw materials mentioned in this application are all commercially available products, intended to fully disclose the raw materials in this application, and should not be construed as limiting the source of the raw materials. Specifically: The inorganic stabilizer used is anhydrous calcium chloride with an effective content ≥96.0% and analytical grade. The organic stabilizer used is analytical grade xanthan gum. Xanthan gum: effective substance content ≥99%, pH=6-8, loss on drying ≤13%, ash content ≤13%, total nitrogen ≤1.5%. The emulsifier used is cationic emulsifier ID with an active ingredient content of 55.0±2% and a pH value (25℃) of 7.0-10.0. N-coco-1,3-propanediamine has a content ≥97%. The pH adjuster used is hydrochloric acid with an effective content of 36%-38% and a relative density of 1.2. Limonene has a purity of 95%. α-Pinene has a purity of 99%. Turpentine has a content ≥90% and is of industrial grade. SBS modified asphalt has a ductility of 45cm at 5℃, a penetration of 6.15mm, and a softening point of 75℃. Rutting-resistant masterbatch modified asphalt has a penetration of 18mm and a softening point of 62℃.
[0033] Example 1 The emulsified asphalt of Example 1 was prepared by the following method: S1. Modify 410 kg of anti-rutting masterbatch, heat it to 150 °C to melt it, add 11 kg of heavy oil, and stir at 500 rad / min for 10 min. S2. Once the temperature of the mixture from step S1 has dropped below 50°C, add 5 kg of turpentine oil (bio-based diluent) and stir until homogeneous. S3. Add 1.7 kg of emulsifier, 0.2 kg of pH adjuster, and 443 kg of water to the mixture from step S2, and stir at 1000 rad / min for 30 min to obtain emulsified asphalt.
[0034] Example 2-3 The preparation methods of the emulsified asphalt in Examples 2-3 are the same as those in Example 1, except that the amount of pH adjuster added to the raw materials is different, as detailed in Table 1.
[0035] Table 1. Raw material list for emulsified asphalt in Examples 2-3 (kg) Example 2 Example 3 Modified asphalt 410 410 Heavy oil 11 11 Turpentine 5 5 Emulsifier 1.7 1.7 pH adjuster 2.6 5 Water 443 443 Examples 4-7 The preparation methods of the emulsified asphalt in Examples 4-7 are the same as those in Example 2, except that the amount of asphalt in the raw materials is different, as detailed in Table 2.
[0036] Table 2. Raw material list for emulsified asphalt in Examples 4-7 (kg) Example 8 The preparation method of the emulsified asphalt in Example 8 is the same as that in Example 5, except that the raw materials also include 12 kg of anhydrous calcium chloride (stabilizer).
[0037] Examples 9-13 The preparation methods of the emulsified asphalt in Examples 9-13 are the same as those in Example 8, except that the stabilizers in the raw materials include organic stabilizers and inorganic stabilizers, and the dosages are different, as detailed in Table 3.
[0038] Table 3. Raw material list for emulsified asphalt in Examples 9-13 (kg) Example 14 The preparation method of the emulsified asphalt in Example 14 is the same as that in Example 11, except that the raw materials also include 1 kg of N-cocoyl-1,3-propanediamine.
[0039] Examples 15-18 The preparation methods of the emulsified asphalt in Examples 15-18 are the same as those in Example 14, except that the amount of emulsifier in the raw materials is different, as detailed in Table 4.
[0040] Table 4. Raw material list for emulsified asphalt in Examples 15-18 (kg) Example 19 The preparation method of the emulsified asphalt in Example 19 is the same as that in Example 16, except that the bio-based diluent used in the raw materials is limonene.
[0041] Example 20 The preparation method of the emulsified asphalt in Example 20 is the same as that in Example 16, except that the bio-based diluent used in the raw materials is α-pinene.
[0042] Comparative Example 1 The preparation method of the emulsion in Comparative Example 1 is the same as that in Example 1, except that no bio-based diluent is added to the raw materials, while the other types and amounts of raw materials are the same as in Example 1.
[0043] Performance testing The performance and stability of the emulsified asphalt obtained from different Examples 1-20 and Comparative Example 1 were tested according to the JT_GF40-2004 Technical Specification for Construction of Highway Asphalt Pavement. The test results are shown in Table 5.
[0044] The stability index experiment was conducted as follows: 50g of the top layer and 50g of the bottom layer of emulsified asphalt from Examples 1-20 and Comparative Example 1 were taken respectively to determine their solid content. The absolute value of the difference was the stability. 1d was the stability of 1 day, which was required to be less than 1, and 5d was the stability of 5 days, which was required to be less than 5.
[0045] Table 5. Test results of different emulsified asphalt properties. The test results in Table 5 show that the solid content of the emulsified asphalt obtained in this application remains basically unchanged with the amount of modified asphalt. However, the particle size, 1-day stability and 5-day stability of the emulsified asphalt are the lowest at 5.37 μm, 0.06% and 1.09% respectively, which significantly improves the emulsification effect.
[0046] The particle size, 1-day stability, and 5-day stability of the emulsified asphalt obtained in Examples 1-3 were 9.52-9.93 μm, 0.67-0.73%, and 2.12-2.22%, respectively, indicating that the pH adjuster can improve the emulsification effect.
[0047] In Examples 2 and 4-7, the particle size, 1-day stability, and 5-day stability of the emulsified asphalt obtained in Examples 4-6 were 8.48-8.90 μm, 0.52-0.58%, and 1.86-1.96%, respectively, all lower than those in Examples 2 and 7. This indicates that a weight ratio of asphalt to bio-based diluent of (90-100):1 is more suitable, which improves the emulsification effect of asphalt. This may be related to the fact that a weight ratio of asphalt to bio-based diluent can reduce the viscosity of asphalt.
[0048] In Examples 5 and 8, the particle size, 1-day stability, and 5-day stability of the emulsified asphalt obtained in Example 8 were 8.14 μm, 0.47%, and 1.77%, respectively, which were lower than those in Example 5. This indicates that it is more appropriate to add a stabilizer to the emulsified asphalt raw material, which improves the emulsification effect of the asphalt. This may be related to the fact that adding a stabilizer to the emulsified asphalt raw material can improve the emulsification stability of the emulsified asphalt.
[0049] In Examples 9-13, the particle size, 1-day stability, and 5-day stability of the emulsified asphalt obtained in Examples 10-12 were 7.10-7.48 μm, 0.31-0.37%, and 1.52-1.61%, respectively, all lower than those in Examples 9 and 13. This indicates that a stabilizer composition of 20-30% organic stabilizer and 70-80% inorganic stabilizer by mass is more suitable, improving the emulsification effect of the asphalt. This may be related to the fact that the addition of organic and inorganic stabilizers can reduce the agglomeration of the asphalt.
[0050] In Examples 11 and 14, the particle size, 1-day stability, and 5-day stability of the emulsified asphalt obtained in Example 14 were 6.75 μm, 0.26%, and 1.43%, respectively, which were lower than those in Example 11. This indicates that it is more suitable to incorporate N-cocoyl-1,3-propylenediamine into the emulsified asphalt raw material, which improves the emulsification effect of the asphalt. This may be related to the fact that incorporating N-cocoyl-1,3-propylenediamine into the emulsified asphalt raw material can improve the dispersibility of the asphalt in water.
[0051] In Examples 14-18, the particle size, 1-day stability, and 5-day stability of the emulsified asphalt obtained in Examples 15-17 were 5.72-6.41 μm, 0.11-0.21%, and 1.17-1.34%, respectively, all lower than those in Examples 14 and 18. This indicates that a weight ratio of (2-3):1 for the emulsifier and N-cocoyl-1,3-propanediamine is more suitable, which improves the emulsification effect of the asphalt. This may be related to the fact that controlling the weight ratio of the emulsifier and N-cocoyl-1,3-propanediamine can improve the emulsification of the asphalt.
[0052] In Examples 16 and 19-20, the particle size, 1-day stability, and 5-day stability of the emulsified asphalt obtained in Examples 19-20 were 5.37 μm, 0.06-0.07%, and 1.09-1.11%, respectively, which were lower than those in Example 16. This indicates that it is more suitable to use limonene or α-pinene as the bio-based diluent in the emulsified asphalt raw material, which improves the emulsification effect of the asphalt. This may be related to the fact that limonene or α-pinene can promote the compatibility of asphalt with other components.
[0053] Furthermore, based on the emulsification data of Comparative Example 1 and Example 1, it was found that adding bio-based diluents to the emulsified asphalt raw materials in this application can improve the emulsification effect of emulsified asphalt to varying degrees.
[0054] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. An emulsified asphalt, characterized in that, The raw materials include the following parts by weight: 400-600 parts asphalt, 8-14 parts heavy oil, 1-9 parts bio-based diluent, 0.5-4 parts emulsifier, 0.2-5 parts pH adjuster, and 400-500 parts water; the asphalt is either rutting-resistant masterbatch modified asphalt or SBS modified asphalt. The bio-based diluent is a terpene unsaturated compound; the terpene unsaturated compound is at least one of acyclic monoterpenes, monocyclic monoterpenes, and bicyclic monoterpenes.
2. The emulsified asphalt according to claim 1, characterized in that, The terpene unsaturated compound is limonene or α-pinene.
3. The emulsified asphalt according to claim 1, characterized in that, The weight ratio of the asphalt and the bio-based diluent is (90-100):
1.
4. The emulsified asphalt according to claim 1, characterized in that, The emulsified asphalt also includes 5-19 parts by weight of stabilizer.
5. The emulsified asphalt according to claim 4, characterized in that, The stabilizer consists of 20-30% organic stabilizer and 70-80% inorganic stabilizer by mass.
6. The emulsified asphalt according to claim 1, characterized in that, The emulsified asphalt raw material also includes 0.1-3 parts by weight of N-cocoyl-1,3-propanediamine.
7. The emulsified asphalt according to claim 1 or 6, characterized in that, The weight ratio of the emulsifier to N-cocoyl-1,3-propanediamine is (2-3):
1.
8. The method for preparing emulsified asphalt according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Heat the asphalt until it melts, add heavy oil, and stir at 300-700 rad / min for 3-10 min; S2. Once the temperature of the mixture from step S1 has dropped below 50°C, add the bio-based diluent and stir until homogeneous. S3. Add emulsifier, pH adjuster, water and other reagents to the mixture from step S2, and stir at 500-1000 rad / min for 10-30 min to obtain emulsified asphalt.