A kind of non-stick wheel emulsified asphalt and preparation method thereof

Abstract

The present application relates to the field of asphalt technology, and specifically discloses a non-stick wheel emulsified asphalt and a preparation method thereof. A non-stick wheel emulsified asphalt comprises the following components in parts by weight: 70-85 parts of base asphalt, 10-20 parts of sulfonated asphalt powder, 8-12 parts of petroleum resin, 10-18 parts of modified high styrene resin, 1.5-2 parts of emulsifier, and 1-1.6 parts of stabilizer, wherein the modified high styrene resin is prepared from styrene, butadiene, polyethylene glycol, ethylene propylene diene rubber and hexaarylbisimidazole; the preparation method thereof is as follows: (1) heating the base asphalt to 120-145°C, adding sulfonated asphalt powder, petroleum resin and modified high styrene resin and mixing them evenly to obtain a mixture; (2) adding an emulsifier and a stabilizer to the above mixture in sequence, and after sufficient reaction, obtaining a non-stick wheel emulsified asphalt. The composition of the present application can be used to strengthen the bonding strength between pavement layers, and has the advantages of non-stick wheel, high softening point, good toughness and low-temperature ductility.

Description

Technical Field

[0001] The present application relates to the field of asphalt technology, and more specifically, to a non-stick wheel emulsified asphalt and a preparation method thereof. Background Art

[0002] The application of bonding layer as a simple, economical and efficient method can strengthen the bonding strength between pavement layers, improve the bearing capacity and durability of the multi-layer composite system structure of the pavement, and minimize pavement problems. The bonding layer is usually composed of base asphalt, modified liquid asphalt, or emulsified asphalt. Since the asphalt bonding layer of the former two has poor dispersion or unevenness, and poor compatibility and bonding strength with the base layer. Therefore, in asphalt pavement paving, emulsified asphalt bonding layer is usually used between asphalt concrete layers to form an overall force structure between layers, thereby reducing the peeling and sliding damage of the surface layer caused by traffic loads, reducing the occurrence of pavement diseases, and improving pavement durability. However, the demulsification time of ordinary emulsified asphalt bonding layer is long, and it often takes several hours after spreading before the paver is allowed to enter the site, resulting in low construction efficiency. Even if the asphalt bonding layer is completely demulsified, the asphalt bonding layer will still be rolled away by the wheels during the driving of the paver, resulting in the loss of the bonding layer and failing to achieve the expected effect.

[0003] At present, hard asphalt or modified hard asphalt is mainly used at home and abroad to prepare non-stick wheel emulsified asphalt to solve the problem that the asphalt sticky layer will be rolled away by the wheels. However, there are still problems such as the prepared asphalt is brittle, the softening point is not high, and the low-temperature ductility is poor. Summary of the invention

[0004] In order to improve the problems of poor low-temperature ductility, low softening point and poor toughness of non-stick wheel emulsified asphalt, the present application provides a non-stick wheel emulsified asphalt and a preparation method thereof.

[0005] In the first aspect, the present application provides a non-stick wheel emulsified asphalt, which adopts the following technical solution:

[0006] A non-stick wheel emulsified asphalt comprises the following components in parts by weight: 70-85 parts of base asphalt, 10-20 parts of sulfonated asphalt powder, 8-12 parts of petroleum resin, 10-18 parts of modified high styrene resin, 1.5-2 parts of emulsifier, and 1-1.6 parts of stabilizer, wherein the modified high styrene resin is prepared from styrene, butadiene, ascorbic acid, a curing agent, ethylene propylene diene monomer rubber, and hexaarylbiimidazole.

[0007] By adopting the above technical scheme, adding petroleum resin with a higher softening point and modified high styrene resin to cooperate with each other to improve the softening point of asphalt while ensuring that the asphalt still maintains good emulsification. The petroleum resin and the modified high styrene resin can cross-link with each other to form a three-dimensional network structure. The attached asphalt molecules and sulfonated asphalt powder are distributed in the polymer network structure. When subjected to external force, the elastic network structure can absorb a large amount of primary energy. The polymer network structure formed by the petroleum resin has good emulsification performance and enhances the low-temperature ductility and toughness of the asphalt. Sulfonated asphalt powder has excellent emulsification performance, is distributed in the polymer network structure, fills the pores and plays a filling role, strengthens the connection between asphalt and other raw material components, contains high-energy carbon-carbon bonds and carbon-sulfur bonds inside, has good high-temperature performance, and further improves the softening point of emulsified asphalt.

[0008] Optionally, the modified high styrene resin comprises the following raw materials in parts by weight: 60-70 parts of styrene, 5-10 parts of butadiene, 20-30 parts of ascorbic acid, 25-30 parts of EPDM rubber, 8-12 parts of curing agent and 20-30 parts of hexaarylbiimidazole.

[0009] By adopting the above technical scheme, the high styrene resin is modified to solve the problem of insufficient toughness and brittleness of asphalt. When synthesizing the modified high styrene resin, EPDM rubber and hexaarylbisimidazole are added to improve the toughness of the resin. The EPDM rubber acts as a stress concentration point and dissipates a large amount of energy when subjected to external force, which significantly improves the impact strength and toughness of the asphalt. The hexaarylbisimidazole has a flexible alkyl chain, and the stacking effect of the π-π bonds it contains increases the stability of the composite. It is grafted in the reactant and forms a structurally stable skeleton with the long molecular chain of the resin, thereby enhancing the toughness of the high styrene resin. At the same time, the hexaarylbisimidazole acts as an initiator in the synthesis system to ensure the normal progress of the reaction and increase the polymerization reaction rate. The addition of ascorbic acid prevents thermal oxidative aging caused by excessive reaction of free radicals.

[0010] Optionally, the modified high styrene resin is prepared by the following method:

[0011] (1) Mix styrene and butadiene at 50-60° C., add hexaarylbiimidazole and ascorbic acid, and perform polymerization for 2-3 hours to obtain a mixed solution;

[0012] (2) Add EPDM rubber and curing agent to the above mixed solution, stir and mix to obtain high styrene resin.

[0013] By adopting the above technical scheme, hexaarylbiimidazole is added to styrene and butadiene after mixing to carry out condensation reaction, and groups with stable aromatic π-π bonds and flexible alkyl chains are grafted onto the high styrene resin molecular chain and blended with EPDM rubber to obtain a molecular chain that can ensure flexibility within a wide temperature range, thereby enhancing the low-temperature ductility and toughness of asphalt, and synthesizing a modified high styrene resin with higher hardness, better toughness and strong impact resistance.

[0014] Optionally, the curing agent is methyl ethyl ketone peroxide.

[0015] By adopting the above technical solution, the active oxygen in methyl ethyl ketone peroxide can promote the cross-linking of EPDM rubber and modified high styrene resin, thereby accelerating the reaction.

[0016] Optionally, the stabilizer is prepared by mixing calcium chloride, hydroxymethyl cellulose ether and hydroxyaluminum distearate.

[0017] By adopting the above technical solution, the double electric layer effect around the emulsion particles is enhanced, the potential is increased, a mutual repulsive force is formed between the emulsion particles, the agglomeration speed of the emulsion particles is slowed down, the emulsification ability is improved, and the stability of the asphalt is improved.

[0018] Optionally, the weight ratio of the calcium chloride, hydroxymethyl cellulose ether and hydroxyaluminum distearate is 1:(1-1.5):(1.8-2).

[0019] By adopting the above technical scheme, calcium chloride and aluminum distearate cooperate with each other to ionize cations, eliminating the charge repulsion between asphalt molecules, making it difficult for water molecules to enter the interior of the asphalt, preventing the hydration and expansion of the asphalt, and cooperating with the emulsifier to accelerate the evaporation of water during demulsification and increase the emulsification speed.

[0020] Optionally, the emulsifier is N-dodecyldimethylamine.

[0021] By adopting the above technical solution, when N-dodecyldimethylamine is added, it is hydrolyzed and ionized in the system to produce cationic hydrophilic groups, which tightly wrap the asphalt mixture and form strong adsorption and intermolecular effects with the asphalt mixture. After being subjected to huge working pressure, the moisture is squeezed to the surface of the asphalt, accelerating the evaporation rate, thereby accelerating the demulsification and solidification of the asphalt and improving work efficiency.

[0022] In a second aspect, the present application provides a method for preparing non-stick wheel emulsified asphalt, using the following technical solution:

[0023] A method for preparing non-stick wheel emulsified asphalt comprises the following steps:

[0024] (1) heating the base asphalt to 120-145° C., adding sulfonated asphalt powder, petroleum resin and modified high styrene resin and mixing them evenly to obtain a mixture;

[0025] (2) Add an emulsifier and a stabilizer to the above mixture in sequence, and after sufficient reaction, obtain a non-stick wheel emulsified asphalt.

[0026] By adopting the above technical scheme, the base asphalt is heated to between 120-145°C to ensure the working performance of the base asphalt, sulfonated asphalt powder, petroleum resin, and modified high styrene resin are added to the base asphalt for blending reaction to form a macromolecular network structure, and emulsifiers and stabilizers are added for emulsification to obtain non-stick wheel emulsified asphalt.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. Since the present application adopts a blended reaction of modified high styrene resin, petroleum resin and matrix asphalt to increase the softening point of asphalt, the modified high styrene resin reacts with the aromatic phenol in the asphalt to increase the flexibility of the aromatic phenol, thereby enhancing the toughness and low-temperature ductility of the emulsified asphalt. The modified high styrene resin and the petroleum resin are cross-linked to form a polymer network structure to wrap the asphalt molecules and sulfonated asphalt powder. After demulsification, an isolation film is formed on the surface of the asphalt to isolate the wheel from the asphalt, achieving a non-stick wheel effect, and the formed network structure also improves the performance of asphalt and increases the toughness of asphalt.

[0029] 2. In the present application, sulfonated asphalt powder is preferably used for adsorption in the formed network structure because it has high bond energy carbon-carbon bonds and carbon-sulfur bonds, which enhance the high temperature performance of the emulsified asphalt. The softening point of the emulsified asphalt is further improved by combining with modified high styrene resin and petroleum resin.

[0030] 3. The present application modifies high styrene resin by using EPDM rubber and hexaarylbisimidazole. The EPDM rubber has good compatibility with the matrix asphalt in the molten state and can help the asphalt absorb a large amount of impact force. The mutual interference of stresses in the asphalt system reduces the further development of cracks, thereby greatly improving the toughness of the asphalt. The hexaarylbisimidazole gives the modified high styrene resin a flexible long alkyl chain, increasing the toughness of the resin. Its π-π bond stacking effect maintains the stability of the resin molecules and their stability in the asphalt.

[0031] 4. The method of the present application firstly causes internal cross-linking by fully reacting petroleum resin, sulfonated asphalt powder and modified high styrene resin with matrix asphalt, thereby promoting the emergence of a polymer network structure, and then adding an emulsifier and a stabilizer for emulsification, thereby accelerating the demulsification process and improving work efficiency. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with embodiments.

[0033] Preparation examples of raw materials and / or intermediates

[0034] Preparation Example 1

[0035] A modified high styrene resin, the preparation method is as follows:

[0036] (1) At 50° C., 60 kg of styrene and 10 kg of butadiene were mixed and reacted for 30 min, and then 20 kg of hexaarylbisimidazole and 25 kg of ascorbic acid were added and polymerized for 2 h to obtain a mixed solution;

[0037] (2) Add 25 kg of EPDM rubber and 8 kg of methyl ethyl ketone peroxide to the above mixed solution, stir and mix to obtain a high styrene resin.

[0038] Preparation Example 2

[0039] A modified high styrene resin, the preparation method is as follows:

[0040] (1) At 55° C., 65 kg of styrene and 5 kg of butadiene were mixed and reacted for 30 min, and then 30 kg of hexaarylbisimidazole and 20 kg of ascorbic acid were added and polymerized for 2 h to obtain a mixed solution;

[0041] (2) Add 27.5 kg of EPDM rubber and 12 kg of methyl ethyl ketone peroxide to the above mixed solution, stir and mix to obtain a high styrene resin.

[0042] Preparation Example 3

[0043] (1) At 60° C., 70 kg of styrene and 8 kg of butadiene were mixed and reacted for 30 min, and then 25 kg of hexaarylbisimidazole and 30 kg of ascorbic acid were added and polymerized for 2 h to obtain a mixed solution;

[0044] (2) Add 30 kg of EPDM rubber and 10 kg of methyl ethyl ketone peroxide to the above mixed solution, stir and mix to obtain a high styrene resin.

[0045] Comparative Preparation Example 1

[0046] A modified high styrene resin is prepared according to the preparation method in Preparation Example 3, except that hexaarylbiimidazole is not added in step (1).

[0047] Comparative Preparation Example 2

[0048] A modified high styrene resin is prepared according to the preparation method in Preparation Example 3, except that no ethylene propylene diene monomer rubber is added in step (2).

[0049] Example

[0050] Example 1

[0051] A non-stick wheel emulsified asphalt, comprising the following preparation steps:

[0052] (1) After 70 kg of base asphalt is uniformly heated to 120° C., 20 kg of sulfonated asphalt powder, 8 kg of petroleum resin and 14 kg of modified high styrene resin are added and mixed uniformly to obtain a mixture;

[0053] (2) 2 kg of N-dodecyldimethylamine and 1 kg of stabilizer were added to the above mixture in sequence, and after sufficient reaction, a non-stick wheel emulsified asphalt was obtained.

[0054] The stabilizer is composed of 0.26 kg of calcium chloride, 0.26 kg of hydroxymethyl cellulose ether and 0.47 kg of hydroxyaluminum distearate. The modified high styrene resin is prepared in Preparation Example 1.

[0055] Example 2

[0056] A non-stick wheel emulsified asphalt, comprising the following preparation steps:

[0057] (1) After 77.5 kg of base asphalt is uniformly heated to 130° C., 10 kg of sulfonated asphalt powder, 12 kg of petroleum resin and 18 kg of modified high styrene resin are added and mixed uniformly to obtain a mixture;

[0058] (2) 1.5 kg of N-dodecyldimethylamine and 1.6 kg of stabilizer were added to the above mixture in sequence, and after sufficient reaction, a non-stick wheel emulsified asphalt was obtained.

[0059] The stabilizer is composed of 0.42 kg of calcium chloride, 0.42 kg of hydroxymethyl cellulose ether and 0.76 kg of hydroxyaluminum distearate. The modified high styrene resin is prepared in Preparation Example 2.

[0060] Example 3

[0061] A non-stick wheel emulsified asphalt, comprising the following preparation steps:

[0062] (1) 85 kg of base asphalt was uniformly heated to 145° C., and then 15 kg of sulfonated asphalt powder, 10 kg of petroleum resin and 10 kg of modified high styrene resin were added and mixed uniformly to obtain a mixture;

[0063] (2) 1.75 kg of N-dodecyldimethylamine and 1.3 kg of stabilizer were added to the above mixture in sequence, and after sufficient reaction, a non-stick wheel emulsified asphalt was obtained.

[0064] The stabilizer is composed of 0.34 kg of calcium chloride, 0.34 kg of hydroxymethyl cellulose ether and 0.62 kg of hydroxyaluminum distearate. The modified high styrene resin is the one prepared in Preparation Example 3.

[0065] Example 4

[0066] A non-stick wheel emulsified asphalt, which is different from Example 2 in that the stabilizer consists of 0.4 kg of calcium chloride, 0.26 kg of hydroxymethyl cellulose ether and 0.47 kg of hydroxyaluminum distearate.

[0067] Example 5

[0068] A non-stick wheel emulsified asphalt, which is different from Example 2 in that the stabilizer consists of 0.36 kg of calcium chloride, 0.54 kg of hydroxymethyl cellulose ether and 0.72 kg of hydroxyaluminum distearate.

[0069] Comparative Example

[0070] Comparative Example 1

[0071] A non-stick wheel emulsified asphalt, which is different from Example 5 in that no modified high styrene resin is added to the raw materials.

[0072] Comparative Example 2

[0073] A non-stick wheel emulsified asphalt, which is different from Example 5 in that an equal amount of modified high styrene resin is replaced by high styrene resin in the raw material.

[0074] Comparative Example 3

[0075] A non-stick wheel emulsified asphalt, which is different from Example 5 in that the modified high styrene resin prepared in Comparative Preparation Example 1 is used as the raw material.

[0076] Comparative Example 4

[0077] A non-stick wheel emulsified asphalt, which is different from Example 5 in that the modified high-styrene resin prepared in Comparative Preparation Example 2 is used as the raw material.

[0078] Comparative Example 5

[0079] A non-stick wheel emulsified asphalt, which is different from Example 5 in that no sulfonated asphalt powder is added to the raw materials.

[0080] Comparative Example 6

[0081] A non-stick wheel emulsified asphalt, which is different from Example 5 in that no petroleum resin is added to the raw materials.

[0082] Performance testing

[0083] Test method / test method Adhesion: According to the evaluation standard of non-stick wheel emulsified asphalt adhesion in JEAAS-2011, the wheel track walking area is obtained by actual measurement. At 70°C, the test wheel ground load is 1.0MPa, and it reciprocates 5 times;

[0084] Demulsification time and softening point: refer to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" for testing;

[0085] Low temperature ductility: Test and detect according to GB / T 4508-2010 "Asphalt ductility determination method";

[0086] Toughness: The test is carried out in accordance with SH / T 0735-2003 “Asphalt viscosity and toughness test method”.

[0087] Table 1

[0088]

[0089] Combining Example 5 with Comparative Examples 1-4 and Table 1, it can be seen that the experimental data of Example 5 are all better than those of Comparative Examples 1-4, indicating that the addition of a modified high-styrene resin prepared from styrene, butadiene, ascorbic acid, a curing agent, EPDM rubber and hexaarylbisimidazole can improve the emulsification point and low-temperature ductility of the emulsified asphalt. When an equal amount of ordinary high-styrene resin is substituted, although the improvement of its softening point can be guaranteed, it will lead to a decrease in the low-temperature ductility and adhesion of the asphalt. The experimental results of Comparative Examples 3-4 are not good, indicating that the modification of the high-styrene resin without the addition of hexaarylbisimidazole or EPDM rubber cannot achieve a good modification effect and cannot achieve an improvement in the performance of the asphalt.

[0090] Combining Example 5 and Comparative Example 5 and Table 1, it can be seen that the experimental data of Example 5 are all better than those of Comparative Example 5, indicating that when the sulfonated asphalt powder is not added, it cannot play a role in assisting the emulsified asphalt to improve the low-temperature ductility of the asphalt, and its emulsification point is also greatly reduced when the sulfonated asphalt powder is lacking.

[0091] Combining Example 5 and Comparative Example 6 with Table 1, it can be seen that the experimental data of Example 5 are better than those of Comparative Example 6, indicating that the failure to add petroleum resin will affect the ductility of asphalt and fail to form an interpenetrating network structure within the system, resulting in a decrease in ductility and toughness.

[0092] It can be seen from Examples 1-5 and Table 1 that the non-stick wheel emulsified asphalt prepared using the solution provided by the present invention has the advantages of good low-temperature ductility, high softening point and short demulsification time.

[0093] Combining Comparative Examples 1-2 with Comparative Examples 5-6 and Table 1, it can be seen that various test data of Comparative Examples 5-6 are better than those of Comparative Examples 1-2, indicating that when modified high styrene resin is added, various performances of asphalt are greatly improved. Petroleum resin and sulfonated asphalt powder are also indispensable raw materials, and they cooperate with modified high styrene resin to improve the softening point, toughness and low-temperature ductility of asphalt.

[0094] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A non-stick wheel emulsified asphalt, characterized in that: The invention comprises the following components in parts by weight: 70-85 parts of base asphalt, 10-20 parts of sulfonated asphalt powder, 8-12 parts of petroleum resin, 10-18 parts of modified high styrene resin, 1.5-2 parts of emulsifier and 1-1.6 parts of stabilizer. The modified high styrene resin is prepared from the following raw materials in parts by weight: 60-70 parts of styrene, 5-10 parts of butadiene, 20-30 parts of ascorbic acid, 25-30 parts of EPDM rubber, 8-12 parts of curing agent and 20-30 parts of hexaarylbiimidazole; the curing agent is methyl ethyl ketone peroxide.

2. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The modified high styrene resin is prepared by the following method: (1) Mix styrene and butadiene at 50-60°C, add hexaarylbiimidazole and ascorbic acid to the mixture, and perform polymerization for 2-3 hours to obtain a mixed solution; (2) Add EPDM rubber and curing agent to the above mixed solution, stir and mix to obtain high styrene resin.

3. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The stabilizer is prepared by mixing calcium chloride, hydroxymethyl cellulose ether and hydroxyaluminum distearate.

4. The non-stick wheel emulsified asphalt according to claim 3, characterized in that: The weight ratio of the calcium chloride, hydroxymethyl cellulose ether and hydroxyaluminum distearate is 1:(1-1.5):(1.8-2).

5. The non-stick wheel emulsified asphalt according to claim 1, characterized in that: The emulsifier is N-dodecyldimethylamine.

6. A method for preparing the non-stick wheel emulsified asphalt according to any one of claims 1 to 5, characterized in that: The steps include: (1) Heat the base asphalt to 120-145°C, add sulfonated asphalt powder, petroleum resin and modified high styrene resin and mix them evenly to obtain a mixture; (2) Add emulsifier and stabilizer to the above mixture in sequence, and after sufficient reaction, obtain non-stick wheel emulsified asphalt.

Images