Mould-proof quick-cracking anion emulsified asphalt and preparation method thereof

Abstract

The invention discloses mould-proof and quick-cracking type anion emulsified asphalt and a preparation method thereof. The mould-proof and quick-cracking type anion emulsified asphalt is prepared from the following raw materials in percentage by weight: 53 to 67 percent of asphalt, 0.4 to 1.2 percent of quick-cracking type anion emulsifier, 0.2 to 0.5 percent of stabilizer, 0.1 to 0.8 percent of mould inhibitor and the balance of water, according to the invention, by selecting the types and dosages of the quick-breaking anionic emulsifier, the stabilizer and the mildew preventive, the prepared mildew-proof quick-breaking anionic emulsified asphalt can be quickly demulsified and solidified, and water and film forming substances can be quickly separated; the mildew-proof quick-cracking type anion emulsified asphalt particles are small in particle size and high in density, so that the small asphalt particles are in a superfine, suspended and micro-emulsion type emulsion system; the stability is good, the storage time is long, and the storage time can be 12 months; the mildew-proof quick-cracking anion emulsified asphalt has the advantages of high solid content, high content of film-forming substances used in unit volume, facilitation of long-distance transportation, good cost accounting, low viscosity and easy spraying of emulsion.

Description

Technical Field

[0001] The invention relates to the technical field of emulsified asphalt, and in particular to an anti-mildew fast-cracking anionic emulsified asphalt and a preparation method thereof. Background Art

[0002] There are many types of emulsified asphalt, which are mainly divided into cationic, anionic and non-ionic emulsified asphalt. Cationic and anionic emulsified asphalt can be further divided into fast-setting, medium-setting and slow-setting emulsified asphalt.

[0003] Emulsified asphalt has a wide range of uses. In the past, it was mainly used in highway construction and maintenance. With the development and application of new technologies and processes, people are exploring and researching some new application areas, such as building waterproofing, moisture-proofing, metal corrosion protection, agricultural soil improvement, plant cultivation and new building materials.

[0004] Cationic emulsified asphalt technology is very mature. Cationic emulsified asphalt forms a bridge through the good affinity and adsorption of the hydrophilic amino group of the emulsifier molecule with the aggregate surface. The asphalt particles reach the aggregate surface through the emulsifier bridge and form a film with the aggregate. At the moment of film formation, the asphalt film layer and the aggregate surface generate a large extrusion force, squeezing out the moisture on the aggregate surface and making it evaporate quickly. Therefore, cationic emulsified asphalt breaks emulsion, coagulates, and forms quickly.

[0005] The main use of anionic emulsified asphalt is also for road use. According to the standards and uses of anionic emulsified asphalt, the demulsification of anionic emulsified asphalt is only good with alkaline mineral aggregates. It coats the aggregates through the adhesion of the asphalt itself to the aggregates. The emulsifier molecules themselves have poor affinity and adsorption with the aggregate surface, so they do not have a bridging effect. When forming a film, they cannot produce an extrusion force to squeeze out the water. The water evenly distributed between the asphalt film and the aggregate surface gradually evaporates through the gaps between the asphalt particles. Since the emulsifier has more hydrophilic groups and forms relatively strong bound water by hydrogen bonds, the water evaporates very slowly and takes a long time. After the water is fully exerted, the asphalt film layer can completely coat the aggregates. Therefore, the demulsification and coagulation of anionic emulsified asphalt are slow. Since the technology of cationic emulsified asphalt is very mature, and anionic emulsified asphalt has problems such as poor stability and easy demulsification, the use of anionic emulsified asphalt is relatively small. There are no reports on anti-mildew fast-cracking anionic emulsified asphalt.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The object of the present invention is to provide a mildew-proof fast-cracking anionic emulsified asphalt and a preparation method thereof. The mildew-proof fast-cracking anionic emulsified asphalt of the present invention specifically limits the types and amounts of different types of petroleum asphalt, fast-cracking anionic emulsifiers, stabilizers and mildew-proof agents, and uses a fast-cracking anionic emulsifier to achieve rapid solidification of the prepared mildew-proof anionic emulsified asphalt; the type and amount of the mildew-proof agent are limited to achieve the requirement that the mildew-proof grade of the fast-cracking anionic emulsified asphalt is 0; on the basis of meeting the above requirements, the amount of emulsifier used is reduced as much as possible. If the amount of the fast-cracking anionic emulsifier is large, the emulsion system is too stable, which is not conducive to rapid demulsification; if the amount of the fast-cracking anionic emulsifier added is too little, the emulsion system becomes unstable, and a small amount of stabilizer needs to be added to meet the stability of the new mildew-proof fast-cracking anionic emulsified asphalt emulsion system.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] The first aspect of the present invention provides a mildew-resistant fast-cracking anionic emulsified asphalt, wherein the mildew-resistant fast-cracking anionic emulsified asphalt is prepared from raw materials including the following weight percentages:

[0010] Asphalt 53% to 67%, fast-cracking anionic emulsifier 0.2% to 1.2%, stabilizer 0.2% to 0.5%, mildew inhibitor 0.1% to 0.8% and the balance is water.

[0011] Preferably, the asphalt is at least one of 50# heavy petroleum asphalt, 70# heavy petroleum asphalt, 90# heavy petroleum asphalt and 40# construction petroleum asphalt, and the aromatic content in the asphalt is not less than 45%.

[0012] Preferably, the fast-cracking anionic emulsifier is selected from at least one of sodium oleate, sodium rosinate, sodium laurate, sodium naphthenate, sodium stearate, lauric acid soap, lignin sulfonate, sulfonated tall oil soap, sulfonated succinic acid, sodium dodecyl sulfate, potassium disproportionate rosinate and sodium dodecylbenzene sulfonate;

[0013] The stabilizer is selected from at least one of sodium carboxymethyl cellulose, sodium hydroxide, potassium hydroxide, hydroxyethyl cellulose, polyvinyl alcohol, polyacrylamide and polyethylene glycol.

[0014] The mildew preventer is selected from at least one of OBPA (10,10′-oxydiphenoloxazine), IPBC (3-iodopropynylbutylcarbamate), ZPT (zinc pyrithione), tetramethylthiuram disulfide, BBIT (2-butyl-1,2-benzisothiazolin-3-one), PHMB (polyhexamethylene biguanide hydrochloride), zinc ion antibacterial agent, nano zinc oxide, nano cuprous oxide, and nano titanium dioxide.

[0015] Preferably, the pH value of the anti-mildew fast-cracking anionic emulsified asphalt is 10.5-13.5, and the average particle size is 0.5-7.5 um.

[0016] The second aspect of the present invention provides a method for preparing the mildew-resistant fast-cracking anionic emulsified asphalt, the preparation method comprising the following steps:

[0017] (a) heating the asphalt to a fluid state to obtain fluid asphalt;

[0018] (b) Add the mildew inhibitor into the fluid asphalt, stir evenly and set aside;

[0019] (c) preparing a stabilizer and an anti-mildew fast-cracking anionic emulsifier into aqueous solutions respectively to obtain a stabilizer solution and an anti-mildew fast-cracking anionic emulsifier solution, then adding the stabilizer solution to water and stirring, then adding the anti-mildew fast-cracking anionic emulsifier solution to water and stirring, and adjusting the pH value to obtain a soap solution;

[0020] (d) pumping the fluid asphalt and soap solution into a colloid mill for high-speed shearing, crushing, mixing, grinding, emulsification and dispersion to obtain the fast-setting anionic emulsified asphalt.

[0021] Preferably, in step (a), the temperature of the asphalt is 135-150°C;

[0022] In the step (c), the water temperature is 35-50° C.; and the pH value of the soap solution is 10.5-13.5.

[0023] Preferably, in step (d), the distance between the rotor and the stator in the colloid mill is 0.8-1.2 mm; and the outlet temperature of the colloid mill is 87° C.-89° C.

[0024] Preferably, the mildew-resistant fast-cracking anionic emulsified asphalt produced by the preparation method can have a storage period of up to 12 months.

[0025] The third aspect of the present invention provides a demulsification method for the above-mentioned anti-mildew and fast-cracking anionic emulsified asphalt, the demulsification method comprising adding the anti-mildew and fast-cracking anionic emulsified asphalt into a demulsifier aqueous solution and stirring the solution / adding the demulsifier aqueous solution into the anti-mildew and fast-cracking anionic emulsified asphalt and stirring the solution.

[0026] Preferably, the demulsifier is selected from at least one of polyether demulsifiers, quaternary ammonium salt demulsifiers, polydimethylammonium chloride demulsifiers, inorganic salt demulsifiers, calcium chloride demulsifiers, magnesium aluminum silicate demulsifiers, polyacrylamide demulsifiers, polyaluminum chloride demulsifiers, magnesium chloride demulsifiers, ferric chloride demulsifiers, aluminum sulfate demulsifiers, and ferrous sulfate demulsifiers.

[0027] Preferably, the ratio of the demulsifier aqueous solution to the shape-retaining quick-setting anionic emulsified asphalt is 2:(0.5-1); the concentration of the demulsifier aqueous solution is 3%-18.5%;

[0028] The stirring treatment time is 3 to 30 seconds.

[0029] Compared with the prior art, the beneficial effects of the present invention include at least:

[0030] There is no related report on mold-proof fast-cracking anionic emulsified asphalt in the prior art, and no strict definition is proposed for the demulsification speed and demulsification effect of mold-proof fast-cracking anionic emulsified asphalt. It solidifies instantly and is not conducive to use. The requirements of the present invention are exactly the opposite. In order to meet specific needs, the present invention needs to prepare a mold-proof fast-cracking anionic emulsion asphalt system; on the basis of ensuring the stability of the emulsion system, the use amount of fast-cracking anionic emulsifier is reduced as much as possible to meet specific requirements; the asphalt particles in the emulsion system have a small particle size and high density, so that the fine asphalt particles are suspended in the emulsion system, which is stable, non-flocculating, non-flocculating, and has good stability and a long storage time, and the storage period can reach 12 months; the mold-proof fast-cracking anionic emulsified asphalt has a high solid content, and the content of film-forming substances that can be used per unit volume is high, which is conducive to long-distance transportation and good cost accounting; the viscosity is low, and the emulsion is easy to spray; by selecting the type and amount of demulsifying materials, the mold-proof fast-cracking anionic emulsified asphalt can be easily, instantly, and completely demulsified. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0033] The raw materials used in the following examples are as follows:

[0034] The asphalt indexes used in each embodiment are shown in Table 1.

[0035] Table 1

[0036]

[0037] Example 1

[0038] This embodiment is a mildew-proof fast-cracking anionic emulsified asphalt, which is prepared from raw materials including the following weight percentages:

[0039] Asphalt 53%, fast-cracking anionic emulsifier 0.3%, stabilizer 0.2%, mildew inhibitor 0.2%, and the balance is water;

[0040] The asphalt is Zhonghai 36-1 heavy cross-linked asphalt AH-70#;

[0041] The fast-breaking anionic emulsifier is lauric acid soap;

[0042] The stabilizer is sodium hydroxide;

[0043] The mildew inhibitor is 3-iodopropynyl butyl carbamate

[0044] The pH value of anti-mildew and fast-cracking anionic emulsified asphalt is 10.5.

[0045] The preparation method of the above-mentioned mildew-proof fast-cracking anionic emulsified asphalt includes, but is not limited to, the following steps:

[0046] (a) heating the asphalt to a fluid state to obtain fluid asphalt at a temperature of 150° C.;

[0047] (b) Add the mildew inhibitor into the fluid asphalt, stir evenly and set aside;

[0048] (c) preparing a stabilizer and a fast-cracking anionic emulsifier into aqueous solutions respectively to obtain a stabilizer solution and a fast-cracking anionic emulsifier solution, then adding the stabilizer solution to water at 35° C. and stirring evenly, then adding the fast-cracking anionic emulsifier solution and stirring evenly and adjusting the pH value to 10.5 to obtain a soap solution;

[0049] (d) pumping the fluid asphalt and soap solution into a colloid mill for high-speed shearing, crushing, mixing, grinding, emulsification and dispersion to obtain the anti-mildew fast-cracking anionic emulsified asphalt, wherein the distance between the rotor and the stator in the colloid mill is 1 mm, and the outlet temperature of the colloid mill is 87° C.

[0050] Example 2

[0051] This embodiment is a mildew-proof fast-cracking anionic emulsified asphalt, which is prepared from raw materials including the following weight percentages:

[0052] Asphalt 55%, fast-cracking anionic emulsifier 0.6%, stabilizer 0.2%, mildew inhibitor 0.4%, the balance is water;

[0053] Asphalt is Fuya brand 70#A grade;

[0054] The fast-breaking anionic emulsifier is sodium lauryl sulfate;

[0055] The stabilizer is potassium hydroxide;

[0056] The mildew preventer is DCOIT (4,5-dichloro-N-octyl-4-isothiazoline-3-one)

[0057] The pH value of anti-mildew and fast-cracking anionic emulsified asphalt is 11.

[0058] The preparation method of the above-mentioned mildew-proof fast-cracking anionic emulsified asphalt includes, but is not limited to, the following steps:

[0059] (a) heating the asphalt to a fluid state to obtain fluid asphalt at a temperature of 135° C.;

[0060] (b) Add the mildew inhibitor into the fluid asphalt, stir evenly and set aside;

[0061] (c) preparing a stabilizer and a fast-cracking anionic emulsifier into aqueous solutions respectively to obtain a stabilizer solution and a fast-cracking anionic emulsifier solution, then adding the stabilizer solution to water at 50° C. and stirring evenly, then adding the fast-cracking anionic emulsifier solution and stirring evenly and adjusting the pH value to 11 to obtain a soap solution;

[0062] (d) pumping the fluid asphalt and soap solution into a colloid mill for high-speed shearing, crushing, mixing, grinding, emulsification and dispersion to obtain the anti-mildew fast-cracking anionic emulsified asphalt, wherein the distance between the rotor and the stator in the colloid mill is 1 mm, and the outlet temperature of the colloid mill is 88° C.

[0063] Example 3

[0064] This embodiment is a mildew-proof fast-cracking anionic emulsified asphalt, which is prepared from raw materials including the following weight percentages:

[0065] Asphalt 58%, fast-cracking anionic emulsifier 0.7%, stabilizer 0.3%, mildew inhibitor 0.6%, and the balance is water;

[0066] Asphalt is Donghai brand 70#;

[0067] The fast-breaking anionic emulsifier is sulfonated tall oil soap;

[0068] The stabilizer is sodium carboxymethyl cellulose;

[0069] The mildew inhibitor is BBIT (2-butyl-1,2-benzisothiazolin-3-one)

[0070] The pH value of anti-mildew and fast-cracking anionic emulsified asphalt is 12.

[0071] The preparation method of the above-mentioned mildew-proof fast-cracking anionic emulsified asphalt includes, but is not limited to, the following steps:

[0072] (a) heating the asphalt to a fluid state to obtain fluid asphalt at a temperature of 45°C;

[0073] (b) Add the mildew inhibitor into the fluid asphalt, stir evenly and set aside;

[0074] (c) preparing a stabilizer and a fast-cracking anionic emulsifier into aqueous solutions respectively to obtain a stabilizer solution and a fast-cracking anionic emulsifier solution, then adding the stabilizer solution to water at 40° C. and stirring evenly, then adding the fast-cracking anionic emulsifier solution and stirring evenly and adjusting the pH value to 12 to obtain a soap solution;

[0075] (d) The fluid asphalt and soap solution are pumped into a colloid mill for high-speed shearing, crushing, mixing, grinding, emulsification and dispersion to obtain a mildew-resistant and fast-cracking anionic emulsified asphalt, wherein the distance between the rotor and the stator in the colloid mill is 1 mm, and the outlet temperature of the colloid mill is 88° C.

[0076] Example 4

[0077] This embodiment is a mildew-proof fast-cracking anionic emulsified asphalt, which is prepared from raw materials including the following weight percentages:

[0078] Asphalt 62%, fast-cracking anionic emulsifier 0.8%, stabilizer 0.4%, mildew inhibitor 0.7%, and the balance is water;

[0079] Asphalt is Korean SK, AH-90#;

[0080] The fast-breaking anionic emulsifier is potassium disproportionate rosin acid;

[0081] The stabilizer is sodium carboxymethyl cellulose;

[0082] Antifungal agent is Tetramethylthiuram disulfide

[0083] The pH value of fast-cracking anionic emulsified asphalt is 12.5.

[0084] The preparation method of the above-mentioned mildew-proof fast-cracking anionic emulsified asphalt includes, but is not limited to, the following steps:

[0085] (a) heating the asphalt to a fluid state to obtain a fluid asphalt at a temperature of 145° C.;

[0086] (b) Add the mildew inhibitor into the fluid asphalt, stir evenly and set aside;

[0087] (c) preparing a stabilizer and a fast-cracking anionic emulsifier into aqueous solutions respectively to obtain a stabilizer solution and a fast-cracking anionic emulsifier solution, then adding the stabilizer solution to water at 40° C. and stirring evenly, then adding the fast-cracking anionic emulsifier solution and stirring evenly and adjusting the pH value to 12.5 to obtain a soap solution;

[0088] (d) pumping the fluid asphalt and soap solution into a colloid mill for high-speed shearing, crushing, mixing, grinding, emulsification and dispersion to obtain the anti-mildew fast-cracking anionic emulsified asphalt, wherein the distance between the rotor and the stator in the colloid mill is 1 mm, and the outlet temperature of the colloid mill is 87° C.

[0089] Example 5

[0090] This embodiment is a mildew-proof fast-cracking anionic emulsified asphalt, which is prepared from raw materials including the following weight percentages:

[0091] Asphalt 65%, fast-cracking anionic emulsifier 1.2%, stabilizer 0.5%, mildew inhibitor 0.8%, the balance is water;

[0092] The asphalt is Kunlun brand heavy traffic asphalt AH-70#;

[0093] The fast-breaking anionic emulsifier is sodium dodecylbenzene sulfonate;

[0094] The stabilizer is polyvinyl alcohol;

[0095] The mildew preventer is a zinc ion antimicrobial agent;

[0096] The pH value of fast-cracking anionic emulsified asphalt is 13.5.

[0097] The preparation method of the above-mentioned mildew-proof fast-cracking anionic emulsified asphalt includes, but is not limited to, the following steps:

[0098] (a) heating the asphalt to a fluid state to obtain a fluid asphalt at a temperature of 145° C.;

[0099] (b) Add the mildew inhibitor into the fluid asphalt, stir evenly and set aside;

[0100] (c) preparing a stabilizer and a fast-cracking anionic emulsifier into aqueous solutions respectively to obtain a stabilizer solution and a fast-cracking anionic emulsifier solution, then adding the stabilizer solution to water at 45° C. and stirring evenly, then adding the fast-cracking anionic emulsifier solution and stirring evenly and adjusting the pH value to 13.5 to obtain a soap solution;

[0101] (d) pumping the fluid asphalt and soap solution into a colloid mill for high-speed shearing, crushing, mixing, grinding, emulsification and dispersion to obtain the anti-mildew fast-cracking anionic emulsified asphalt, wherein the distance between the rotor and the stator in the colloid mill is 1 mm, and the outlet temperature of the colloid mill is 89° C.

[0102] Example 6

[0103] The present embodiment is a method for demulsifying mildew-resistant and fast-cracking anionic emulsified asphalt, which comprises adding the mildew-resistant and fast-cracking anionic emulsified asphalt into a demulsifier aqueous solution and stirring the solution, wherein the concentration of the demulsifier aqueous solution is 10%; the ratio of the demulsifier aqueous solution to the mildew-resistant and fast-cracking anionic emulsified asphalt is 2:1; and the demulsifier is calcium chloride.

[0104] The demulsifier aqueous solution is prepared by the following method:

[0105] Step 1: Add the above demulsifier into a container filled with water, wherein the water temperature is room temperature;

[0106] Step 2: Use a stirrer to stir the water in the water container in step 1 at a constant speed in a clockwise direction for 20 minutes. At this time, foam will appear, which does not need to be treated;

[0107] Step 3: Rest for 15 minutes;

[0108] Step 4: Stir again for 5 minutes;

[0109] Step 5: Wait for 10 minutes until the bubbles in the water disappear completely;

[0110] Step 6: Stir at a constant speed for another 5 minutes and set aside.

[0111] Experimental example

[0112] The mildew-proof and fast-cracking anionic emulsified asphalts prepared in Examples 1 to 5 were obtained respectively; the performance indicators and environmental protection indicators of each mildew-proof and fast-cracking anionic emulsified asphalt were tested, the test method is shown in Table 2, the environmental protection indicators are shown in Table 3, and the test results are shown in Tables 4 to 8, wherein the mildew-proof and fast-cracking anionic emulsified asphalt indicators of Examples 1 to 5 correspond to Tables 4 to 8 one by one;

[0113] Table 2

[0114]

[0115]

[0116] Table 3 Environmental indicators (JC1066 "Limits of harmful substances in (water-based) building waterproof coatings")

[0117] project Detection indicators Grade A content Volatile organic compounds (VOC) / g / L≤ Not detected 80 Free formaldehyde / mg / kg≤ Not detected 100 Total of benzene, toluene, ethylbenzene and xylene mg / kg≤ Not detected 300

[0118] Table 4

[0119]

[0120] Table 5

[0121]

[0122] Table 6

[0123]

[0124] Table 7

[0125]

[0126] Table 8

[0127]

[0128] It can be seen from Tables 4 to 8 that the average particle size of the mildew-proof fast-cracking anionic emulsified asphalt prepared in the above five embodiments is in the range of 0.5 to 7.5 um, and the mildew resistance performance all reaches level 0, and all meet the environmental protection indicators in Table 3 (JC1066-2008 "Limits of Harmful Substances in (Water-Based) Building Waterproof Coatings"); the storage stability reaches 12 months without demulsification, flocculation, precipitation, and agglomeration, and has good stability; directly mixed and stirred with the demulsifier aqueous solution, the technical effect of 100% demulsification can be achieved within 3 to 30 seconds, and the aqueous solution and the film-forming substance are quickly separated.

[0129] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A mildew-proof fast-cracking anionic emulsified asphalt, characterized in that: Made from the following raw materials in percentage by weight: Asphalt 53% to 67%, fast-cracking anionic emulsifier 0.2% to 1.2%, stabilizer 0.2% to 0.5%, mildew inhibitor 0.1% to 0.8%, and the balance is water.

2. The anti-mildew fast-cracking anionic emulsified asphalt according to claim 1, characterized in that: The asphalt is at least one of 50# heavy petroleum asphalt, 70# heavy petroleum asphalt, 90# heavy petroleum asphalt and 40# construction petroleum asphalt, and the aromatic content of the asphalt is not less than 45%.

3. The anti-mildew fast-cracking anionic emulsified asphalt according to claim 1, characterized in that: The fast-breaking anionic emulsifier is a carboxylate, sulfonate or sulfate ester; The fast-cracking anionic emulsifier is at least one selected from sodium oleate, sodium rosinate, sodium laurate, sodium naphthenate, sodium stearate, lauric acid soap, lignin sulfonate, sulfonated tall oil soap, sulfonated succinic acid, sodium lauryl sulfate, potassium disproportionate rosinate and sodium dodecylbenzene sulfonate; The stabilizer is selected from at least one of sodium carboxymethyl cellulose, sodium hydroxide, potassium hydroxide, hydroxyethyl cellulose, polyvinyl alcohol, polyacrylamide and polyethylene glycol; The mildew preventer is selected from at least one of 10,10′-oxydiphenoloxazine, 3-iodopropynylbutylcarbamate, zinc pyrithione, tetramethylthiuram disulfide, 2-butyl-1,2-benzisothiazolin-3-one, polyhexamethylene biguanide hydrochloride, zinc ion antibacterial agent, nano zinc oxide, nano cuprous oxide and nano titanium dioxide.

4. The anti-mildew fast-cracking anionic emulsified asphalt according to claim 1, characterized in that: The pH value of the anti-mildew fast-cracking anionic emulsified asphalt is 10.5-13.5, and the average particle size is 0.5-7.5 um.

5. The method for preparing the mildew-resistant fast-cracking anionic emulsified asphalt according to any one of claims 1 to 4, characterized in that: The steps include: (a) heating the asphalt to a fluid state to obtain fluid asphalt; (b) Add the mildew inhibitor into the fluid asphalt, stir evenly and set aside; (c) preparing a stabilizer and a fast-cracking anionic emulsifier into aqueous solutions respectively to obtain a stabilizer solution and a fast-cracking anionic emulsifier solution, then adding the stabilizer solution to water and stirring evenly, then adding the fast-cracking anionic emulsifier solution to water and stirring evenly and adjusting the pH value to obtain a soap solution; (d) pumping the fluid asphalt and the soap solution into a colloid mill for high-speed shearing, crushing, mixing, grinding, emulsification and dispersion to obtain the anti-mildew fast-cracking anionic emulsified asphalt.

6. The preparation method according to claim 5, characterized in that: In the step (a), the temperature of the asphalt is 135-150°C; In the step (c), the water temperature is 35-50° C.; the pH value of the soap solution is 10.5-13.5; In the step (d), the distance between the rotor and the stator in the colloid mill is 0.8-1.2 mm; and the outlet temperature of the colloid mill is 87° C.-89° C.

7. The preparation method according to claim 5 or 6, characterized in that: The mildew-proof fast-cracking anionic emulsified asphalt prepared by the preparation method has a storage period of 12 months.

8. The demulsification method of the mildew-proof fast-cracking anionic emulsified asphalt according to claim 1, characterized in that: The demulsification method comprises adding the anti-mildew and fast-cracking anionic emulsified asphalt into an aqueous solution of an emulsifier and stirring the solution / adding the aqueous solution of an emulsifier into an anti-mildew and fast-cracking anionic emulsified asphalt and stirring the solution.

9. The demulsification method according to claim 8, characterized in that: The demulsifier is selected from at least one of polyether demulsifiers, quaternary ammonium salt demulsifiers, polydimethylammonium chloride demulsifiers, inorganic salt demulsifiers, calcium chloride demulsifiers, magnesium aluminum silicate demulsifiers, polyacrylamide demulsifiers, polyaluminum chloride demulsifiers, magnesium chloride demulsifiers, ferric chloride demulsifiers, aluminum sulfate demulsifiers, and ferrous sulfate demulsifiers.

10. The demulsification method according to claim 8, characterized in that: The ratio of the demulsifier aqueous solution to the mildew-proof fast-cracking anionic emulsified asphalt is 2:(0.5-1); the concentration of the demulsifier aqueous solution is 3%-18.5%; The stirring treatment time is 3 to 30 seconds.

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