Doughening agent for modified asphalt and preparation method thereof, and modified asphalt

Abstract

The invention relates to the technical field of asphalt auxiliaries, in particular to a ductility improver for modified asphalt, a preparation method of the ductility improver and the modified asphalt. The ductility improver for modified asphalt provided by the invention is prepared from the following raw materials in percentage by mass: 70-94% of vegetable oil; 1%-5% of epoxy fatty acid methyl ester; and 5%-25% of fatty alcohol ether phosphate. According to the ductility improver provided by the invention, all the components have a synergistic effect, so that the ductility indexes of asphalt before and after aging are improved, and meanwhile, the thermal stability of the asphalt is enhanced. In addition, the components of the ductility enhancer prepared by the invention are cheap, easy to obtain, environment-friendly, non-toxic and harmless, and accord with the concept of green and sustainable development of auxiliaries.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt additives, and in particular to a retarder for modified asphalt and a preparation method thereof, as well as modified asphalt. Background Art

[0002] The performance of asphalt directly determines the quality and service life of the road surface. Ordinary asphalt is sensitive to temperature. It tends to flow at high temperatures and becomes hard and brittle at low temperatures, which leads to frequent cracks, rutting, looseness, subsidence and other defects on asphalt roads. Therefore, it is necessary to improve the performance and quality of asphalt to meet the requirements of current highways.

[0003] Modified asphalt is a type of asphalt that improves asphalt performance by adding modifiers. It can make up for the defects of base asphalt performance to a certain extent, such as high temperature index, but low temperature index is still often unqualified. A small amount of ductility enhancer needs to be added during the production process to improve the ductility index, slow down the aging behavior caused by oxidation during storage, and reduce the decay rate of the asphalt ductility index. However, the ductility enhancer in the prior art has poor effect on improving the ductility index and thermal stability of modified asphalt after aging. Summary of the invention

[0004] In view of this, the present invention provides a ductility enhancer for modified asphalt and a preparation method thereof, as well as modified asphalt. The modified asphalt provided by the present invention can improve the ductility index of asphalt before and after aging and also enhance the thermal stability of asphalt.

[0005] The present invention provides a retardant for modified asphalt, and the raw materials for preparing the retardant include the following components in percentage by mass:

[0006] Vegetable oil 70%-94%;

[0007] Epoxy fatty acid methyl ester 1% to 5%;

[0008] Fatty alcohol ether phosphate 5%~25%.

[0009] Preferably, the vegetable oil is a vegetable oil whose main components include glyceride, fatty acid and oleic acid and whose carbon number is between 16 and 21.

[0010] Preferably, the vegetable oil is at least one of soybean oil, peanut oil, rapeseed oil, palm oil, linseed oil, sesame oil and corn oil.

[0011] Preferably, the fatty alcohol ether phosphate is lauryl alcohol ether phosphate.

[0012] Preferably, the lauryl alcohol ether phosphate is lauryl alcohol ether phosphate MOA-3P.

[0013] Preferably, the dosage of each component is as follows:

[0014] Vegetable oil 82%-87%;

[0015] Epoxy fatty acid methyl ester 3% to 5%;

[0016] Fatty alcohol ether phosphate 7%~18%.

[0017] The present invention also provides a method for preparing the retarding agent for modified asphalt described in the above technical solution, comprising the following steps:

[0018] The vegetable oil, epoxy fatty acid methyl ester and fatty alcohol ether phosphate are mixed and heated to obtain a retarding agent.

[0019] Preferably, the heating temperature is 80-110°C.

[0020] The present invention also provides a modified asphalt, the raw materials for preparing the modified asphalt include the following components:

[0021] Base asphalt;

[0022] Modifier, the amount of which is 3.5% to 4.5% of the base asphalt;

[0023] A retarder, the dosage of which is 2.0% to 4.0% of the base asphalt;

[0024] Stabilizer, the amount of which is 0.21% to 0.29% of the base asphalt;

[0025] Wherein, the retarding agent is the retarding agent for modified asphalt described in the above technical scheme or the retarding agent prepared by the preparation method described in the above technical scheme.

[0026] Preferably, the modifier is a SBS modifier.

[0027] The extender provided by the present invention is prepared by combining vegetable oil, epoxy fatty acid methyl ester and fatty alcohol ether phosphate in a certain proportion. The vegetable oil used can produce physical and chemical interactions with polar groups such as hydroxyl and phenol groups in asphaltene and colloid in asphalt, thereby improving the anti-aging performance of asphalt and compatibility with modifiers such as SBS, and improving the thermal storage stability of asphalt; at the same time, the introduction of epoxy fatty acid methyl ester can extend the aging time of asphalt, improve the ductility index after asphalt aging, and is environmentally friendly; the introduction of specific fatty alcohol ether phosphate can promote the compatibility of asphalt with modifiers such as SBS, reduce the surface tension of the two-phase interface, and enhance the stability of modified asphalt. The synergistic effect between the components of the extender improves the ductility index before and after asphalt aging while also enhancing the thermal stability of asphalt. In addition, the components of the extender prepared by the present invention are cheap and easy to obtain, and are environmentally friendly, non-toxic and harmless, and meet the concept of green sustainable development of additives. DETAILED DESCRIPTION

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0029] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0030] Herein, when it comes to numerical ranges, unless otherwise specified, the numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0031] In this article, when referring to the unit of a data range, if there is a unit only after the right endpoint, it means that the units of the left and right endpoints are the same. For example, 80-110℃ means that the units of the left endpoint "80" and the right endpoint "110" are both ℃.

[0032] Only some numerical ranges are specifically disclosed herein. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and likewise any upper limit can be combined with any other upper limit to form an unspecified range. In addition, each separately disclosed point or single value can itself be combined as a lower limit or upper limit with any other point or single value or with other lower limits or upper limits to form an unspecified range.

[0033] The present invention provides a retardant for modified asphalt, and the raw materials for preparing the retardant include the following components in percentage by mass:

[0034] Vegetable oil 70%-94%;

[0035] Epoxy fatty acid methyl ester 1% to 5%;

[0036] Fatty alcohol ether phosphate 5%~25%.

[0037] In the present invention, the vegetable oil is preferably a vegetable oil whose main components include glyceride, fatty acid and oleic acid, and whose carbon number is between 16 and 21; more preferably, it is at least one of soybean oil, peanut oil, rapeseed oil, palm oil, linseed oil, sesame oil and corn oil. Compared with traditional heavy oil components, the above-mentioned vegetable oil can produce physical and chemical interactions with polar groups such as hydroxyl and phenolic groups in asphaltene and colloid in asphalt, thereby improving the anti-aging properties of asphalt and compatibility with modifiers such as SBS, and improving the thermal storage stability of asphalt; at the same time, it has a wide range of sources and low prices, which can effectively solve the environmental pollution caused by heavy oil components and the high cost problems caused by resource scarcity. The present invention has no special restrictions on the source of the vegetable oil, and it can be a commercial product on the market. In the present invention, the amount of the vegetable oil is 70% to 94%, specifically 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, more preferably 82% to 87%.

[0038] In the present invention, the epoxy fatty acid methyl ester is different from the dioctyl phthalate (DOP) and dioctyl adipate (DOA) plasticizers added in the conventional retardant, and can prolong the aging time of asphalt, improve the ductility index of asphalt after aging, and is more environmentally friendly. The present invention has no special restrictions on the source of the epoxy fatty acid methyl ester, and it can be a commercial product. In the present invention, the amount of the epoxy fatty acid methyl ester is 1% to 5%, specifically 1%, 2%, 3%, 4%, 5%, and more preferably 3% to 5%.

[0039] In the present invention, the fatty alcohol ether phosphate is preferably lauryl alcohol ether phosphate, more preferably lauryl alcohol ether phosphate MOA-3P, which can be provided by Haian Petrochemical, Jiangsu Province. The present invention introduces the above-mentioned fatty alcohol ether phosphate, whose molecular structure is the association of fatty alcohol chain and ethylene oxide (EO) or propylene oxide (PO) chain, which can be used as a surfactant and a stabilizing dispersant, and can promote the compatibility of asphalt with a modifier such as SBS, reduce the surface tension of the two-phase interface, and enhance the stability of modified asphalt. In the present invention, the amount of the fatty alcohol ether phosphate is 5% to 25%, specifically 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, preferably 7% to 18%.

[0040] In the present invention, the total amount of the vegetable oil, epoxy fatty acid methyl ester and fatty alcohol ether phosphate is preferably 100%.

[0041] In the present invention, the modified asphalt is asphalt modified by a modifier, wherein the modifier is preferably SBS.

[0042] The present invention also provides a method for preparing the retarding agent for modified asphalt described in the above technical solution, comprising the following steps: mixing vegetable oil, epoxy fatty acid methyl ester and fatty alcohol ether phosphate, and heating to obtain the retarding agent.

[0043] Among them, the types and amounts of the vegetable oil, epoxy fatty acid methyl ester and fatty alcohol ether phosphate are consistent with those described in the previous technical solution, and will not be repeated here one by one. The mixing method is not particularly limited, and the above raw materials can be mixed evenly according to the conventional mixing method in the field. The heating temperature is preferably 80-110°C, specifically 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C. In the present invention, the heating process is preferably accompanied by stirring, that is, stirring and heating. The heating time is not particularly limited, and it is sufficient to ensure that each component is completely stirred and evenly mixed. It can generally be 40-80min, and can specifically be 40min, 45min, 50min, 55min, 60min, 65min, 70min, 75min, 80min. After the above treatment, a retardant is obtained.

[0044] The present invention also provides a modified asphalt, the raw materials for preparing the modified asphalt include the following components:

[0045] Base asphalt;

[0046] Modifier, the amount of which is 3.5% to 4.5% of the base asphalt;

[0047] A retarder, the dosage of which is 2.0% to 4.0% of the base asphalt;

[0048] Stabilizer, the amount of which is 0.21% to 0.29% of the base asphalt;

[0049] Wherein, the retarding agent is the retarding agent described in the above technical solution or the retarding agent prepared by the preparation method described in the above technical solution.

[0050] In the present invention, there is no special restriction on the type of the base asphalt, which can be any conventional base asphalt in the art, preferably 70# base asphalt.

[0051] In the present invention, the modifier is preferably an SBS (i.e., styrene-butadiene-styrene block copolymer) modifier, and in some embodiments, it is an SBS of model YH-791H. In the present invention, the amount of the modifier is preferably 3.5% to 4.5% of the mass of the base asphalt, specifically 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%.

[0052] In the present invention, the retarding agent is the retarding agent described in the above technical solution, which will not be described in detail here. In the present invention, the amount of the retarding agent is preferably 2.0% to 4.0% of the mass of the matrix asphalt, specifically 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%.

[0053] In the present invention, the stabilizer is preferably a Boyue stabilizer, model HMD, provided by Dongying Runfeng Boyue Petroleum Technology Co., Ltd. In the present invention, the amount of the stabilizer is preferably 0.21% to 0.29% of the mass of the matrix asphalt, specifically 0.21%, 0.22%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%.

[0054] The present invention also provides a method for preparing the modified asphalt described in the above technical solution, which is characterized by comprising: mixing and heating the base asphalt and the modifier, then adding a retardant and a stabilizer, heating and stirring to obtain an asphalt material.

[0055] Wherein, the types and amounts of the matrix asphalt, modifier, retardant and stabilizer are consistent with those described in the above technical solution, and will not be repeated here one by one. Wherein, the temperature for mixing and heating the matrix asphalt and the modifier is preferably 160-185°C, specifically 160°C, 165°C, 170°C, 175°C, 180°C, 185°C, and more preferably 175°C. Specifically, it can be placed in a heating jacket for heating and mixing. Shearing is preferably accompanied during the above heating process. The heating time is preferably 30-50min, specifically 30min, 35min, 40min, 45min, 50min, and more preferably 40min. The heating temperature after adding the retardant and stabilizer is preferably 170-190°C, specifically 170°C, 175°C, 180°C, 185°C, and more preferably 185°C. The heating and stirring time is preferably 90 to 120 minutes, specifically 90 minutes, 95 minutes, 100 minutes, 105 minutes, 110 minutes, 115 minutes, 120 minutes, and more preferably 100 minutes. After stirring and developing, an asphalt material is obtained.

[0056] The extender provided by the present invention is prepared by combining vegetable oil, epoxy fatty acid methyl ester and fatty alcohol ether phosphate in a certain proportion. The vegetable oil used can produce physical and chemical interactions with polar groups such as hydroxyl and phenol groups in asphaltene and colloid in asphalt, thereby improving the anti-aging performance of asphalt and compatibility with modifiers such as SBS, and improving the thermal storage stability of asphalt; at the same time, the introduction of epoxy fatty acid methyl ester can extend the aging time of asphalt, improve the ductility index after asphalt aging, and is environmentally friendly; the introduction of specific fatty alcohol ether phosphate can promote the compatibility of asphalt with modifiers such as SBS, reduce the surface tension of the two-phase interface, and enhance the stability of modified asphalt. The synergistic effect between the components of the extender improves the ductility index before and after asphalt aging while also enhancing the thermal stability of asphalt. In addition, the components of the extender prepared by the present invention are cheap and easy to obtain, and are environmentally friendly, non-toxic and harmless, and meet the concept of green sustainable development of additives.

[0057] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0058] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods. Among them, epoxy fatty acid methyl ester is from Tesco Chemical. Lauryl alcohol ether phosphate MOA-3P is from Hai'an Petrochemical, Jiangsu Province.

[0059] Example 1

[0060] raw material:

[0061] Soybean oil 90%, epoxy fatty acid methyl ester 5%, lauryl ether phosphate MOA-3P 5%.

[0062] preparation:

[0063] The above raw materials are weighed in proportion, mixed evenly, and heated with stirring at 100° C. for 60 minutes to completely mix the components to obtain a retardant.

[0064] Example 2

[0065] raw material:

[0066] Soybean oil 80%, epoxy fatty acid methyl ester 5%, lauryl ether phosphate MOA-3P 15%.

[0067] Preparation: Same as Example 1.

[0068] Example 3

[0069] raw material:

[0070] Soybean oil 70%, epoxy fatty acid methyl ester 5%, lauryl ether phosphate MOA-3P 25%.

[0071] Preparation: Same as Example 1.

[0072] Example 4

[0073] raw material:

[0074] Soybean oil 82%, epoxy fatty acid methyl ester 1%, lauryl ether phosphate MOA-3P 17%.

[0075] Preparation: Same as Example 1.

[0076] Example 5

[0077] raw material:

[0078] Soybean oil 30%, peanut oil 40%, epoxy fatty acid methyl ester 5%, lauryl ether phosphate MOA-3P 25%.

[0079] Preparation: Same as Example 1.

[0080] Example 6

[0081] raw material:

[0082] Soybean oil 42%, palm oil 40%, epoxy fatty acid methyl ester 1%, lauryl ether phosphate MOA-3P 17%.

[0083] Preparation: Same as Example 1.

[0084] Comparative Example 1

[0085] The traditional aromatic oil heavy component extender comes from Shandong Furunda Chemical Co., Ltd., that is, the modified asphalt extender of Shandong Furunda Chemical Co., Ltd.

[0086] Effect test:

[0087] The effects of the extenders of Examples 1-6 and the extender of Comparative Example 1 on the performance of SBS modified asphalt were compared and tested, and the results are shown in Table 1. The specific preparation process of the modified asphalt is as follows: 550g of 70# base asphalt and 23.65g of modifier YH-791H SBS were placed in a heating jacket at 175°C for mixing and shearing for 40min, then 17.6g of extender and 1.38g of Boyue stabilizer HMD were added, and the mixture was stirred and grown at 185°C for 100min to obtain an asphalt material.

[0088] Table 1: Performance test results of asphalt materials

[0089] Performance Indicators Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Needle penetration (25℃, 100g, 5s), 0.1mm 65.3 64.9 64.7 65.0 64.6 65.2 67.1 Softening point, ℃ 78 78.5 78.1 77.4 79.2 78.8 77.5 5℃ elongation, cm 42.7 41.8 42.5 41.2 42.1 42.6 30.9 Elongation at 5℃ after TFOT, cm 21.8 21.4 22.6 22.1 21.5 21.3 15.3 Residual penetration ratio, 25℃, % 65.1 64.5 65.6 64.6 64.3 65.0 61.3

[0090] Note: The conditions of the TFOT aging test are as follows: for each example product, 3 parallel samples of 50±0.5g are weighed and placed in a thin film oven at 163±1℃ for aging. The total time shall not exceed 5.25h, and then the average value of the 3 parallel samples is taken as the test result of the example product (the same applies to comparative example 1). The residual penetration ratio refers to the ratio of the penetration index before and after heating. In the above table, it specifically refers to the ratio of the penetration index before and after the TFOT thermal aging test; this index is a quality index used to evaluate the durability and atmospheric stability of asphalt. The higher the data, the better the quality.

[0091] From the test results in Table 1, it can be seen that the elongation of comparative example 1 is 30.9 cm, while the elongation of examples 1-6 is above 41 cm; after TFOT thermal aging, the elongation of comparative example 1 drops to 15.3 cm, while the elongation of examples 1-6 is above 21 cm; it can be seen that the ductility enhancer of the present invention can effectively improve the ductility index before and after asphalt aging. In addition, the residual penetration ratio of comparative example 1 is 61.3%, while the residual penetration ratio of examples 1-6 reaches more than 64%, which is significantly improved compared with comparative example 1, proving that the ductility enhancer of the present invention can effectively improve the thermal stability of asphalt materials. It can be seen that the ductility enhancer of the present invention not only improves the ductility index before and after asphalt aging, but also enhances the thermal stability of asphalt.

[0092] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enable any technician in the field to practice the present invention, including making and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements similar to the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. A retarder for modified asphalt, characterized in that: The raw materials for its preparation include the following components in percentage by mass: Vegetable oil 70%-94%; Epoxy fatty acid methyl ester 1% to 5%; Fatty alcohol ether phosphate 5%~25%.

2. The retarder for modified asphalt according to claim 1, characterized in that: The vegetable oil is a vegetable oil whose main components include glyceride, fatty acid and oleic acid and whose carbon number is between 16 and 21.

3. The retarding agent for modified asphalt according to claim 1 or 2, characterized in that: The vegetable oil is at least one of soybean oil, peanut oil, rapeseed oil, palm oil, linseed oil, sesame oil and corn oil.

4. The retarding agent for modified asphalt according to claim 1, characterized in that: The fatty alcohol ether phosphate is lauryl alcohol ether phosphate.

5. The retarder for modified asphalt according to claim 4, characterized in that: The lauryl alcohol ether phosphate is lauryl alcohol ether phosphate MOA-3P.

6. The retarding agent for modified asphalt according to claim 1, characterized in that: The dosage of each component is as follows: Vegetable oil 82%-87%; Epoxy fatty acid methyl ester 3% to 5%; Fatty alcohol ether phosphate 7%~18%.

7. A method for preparing a retarding agent for modified asphalt according to any one of claims 1 to 6, characterized in that: The following steps are involved: The vegetable oil, epoxy fatty acid methyl ester and fatty alcohol ether phosphate are mixed and heated to obtain a retarding agent.

8. The preparation method according to claim 7, characterized in that: The heating temperature is 80-110°C.

9. A modified asphalt, characterized in that: The raw materials for its preparation include the following components: Base asphalt; Modifier, the amount of which is 3.5% to 4.5% of the base asphalt; A retarder, the dosage of which is 2.0% to 4.0% of the base asphalt; Stabilizer, the amount of which is 0.21% to 0.29% of the base asphalt; Wherein, the retarder is the retarder for modified asphalt according to any one of claims 1 to 6 or the retarder prepared by the preparation method according to any one of claims 7 to 8.

10. The modified asphalt according to claim 9, characterized in that: The modifier is SBS modifier.