An elongating agent, its preparation method and application

Abstract

This application relates to a ductile agent, its preparation method, and its application, belonging to the field of engineering materials technology. The ductile agent of this application comprises the following components by mass percentage: 30-70% plant fiber powder and 30-70% vegetable oil. The ductile agent provided in this application requires a small amount of additive, significantly increases the low-temperature ductility of asphalt, and simultaneously improves the ductility of asphalt after aging, while having minimal impact on the high-temperature performance and penetration of asphalt.

Description

Technical Field

[0001] This application relates to the field of engineering materials technology, and in particular to a twisting agent, its preparation method, and its application. Background Technology

[0002] Asphalt produced using heavy crude oil vacuum residue as raw material lacks essential oily components (especially aromatics), resulting in inherent defects that cause the low-temperature ductility of both base and modified asphalt to fail to meet the technical requirements of asphalt products. Adding light oils, aromatic oils, and plasticizers (dibutyl phthalate (DBP) and dioctyl phthalate (DOP)) to asphalt can improve the ductility of both base and modified asphalt; however, small additions have little effect, while larger additions increase penetration and lower softening point, limiting its effectiveness. Styrene-butadiene rubber (SBR) and other plastic products have also attracted researchers' attention in improving asphalt ductility, but actual production procedures are cumbersome, with risks of sudden boiling and overflow, and continuous high-temperature storage is required to prevent significant degradation of ductility. Utilizing the characteristics of various materials and creating synergistic effects can more effectively improve the low-temperature ductility of asphalt. For example, composite materials prepared from aromatic oils, SBR, antioxidants, plasticizers, stabilizers, and inorganic materials can be used as ductility enhancers for asphalt. Among them, organic-inorganic hybrid materials are an effective way to improve the low-temperature ductility of asphalt. Because both the organic and inorganic components can interact with asphalt to form effective physical cross-linking points, the effect of improving the low-temperature ductility of asphalt is obvious. The addition amount is low and does not affect the high-temperature performance of asphalt. However, its main component is inorganic, the hybrid organic component is low, the compatibility with asphalt is poor, and the density is much higher than that of asphalt, which limits its application in asphalt. Summary of the Invention

[0003] In view of this, the embodiments of this application provide a tardant, its preparation method and application, which can effectively overcome the defects existing in the prior art.

[0004] The first aspect of this application provides a elastomeric agent comprising the following components by mass percentage: 30-70% plant fiber powder and 30-70% vegetable oil.

[0005] Plant fiber powder and asphalt share the same origin. Asphalt includes base asphalt, road petroleum asphalt, modified asphalt, and asphalt for waterproof membranes, among others. Plant fiber powder exhibits good compatibility and dispersibility within asphalt, acting as a stabilizer. Hard plant fiber powder is a natural organic-inorganic hybrid material with a low proportion of inorganic components; its main component is organic matter, resulting in a low density. The organic components, after swelling, form physical cross-linking points with asphalt through intermolecular forces and hydrogen bonds; the inorganic components also provide cross-linking points for asphalt. Asphalt has good oleophilicity, while plant fiber powder has some hydrophilicity, affecting the interfacial interaction between the two. Plant oil, an oily surfactant, can effectively improve the interfacial interaction between plant fiber powder and asphalt.

[0006] In some embodiments that may include the above embodiments, the plant fiber powder is hard plant fiber powder, which is at least one of rice husk powder, wheat husk powder, wheat straw powder, peanut shell powder, bean shell powder, and fruit shell powder.

[0007] In some embodiments that may include the above embodiments, the straw powder is at least one of wheat flour, oat flour, naked oat flour, and highland barley flour.

[0008] In some embodiments that may include the above embodiments, the fruit shell powder is apricot shell powder and / or walnut shell powder.

[0009] In some embodiments that may include the above-described embodiments, the particle size of the plant fiber powder is ≤0.3mm.

[0010] In some embodiments that may include the above embodiments, the vegetable oil is at least one of oleic acid, linoleic acid, soybean oil, rapeseed oil, peanut oil, sesame oil, and corn oil.

[0011] A second aspect of this application also provides a method for preparing the above-mentioned elongating agent, comprising the following steps:

[0012] (1) The hard plant fiber is baked, the baked hard plant fiber is broken into short fiber, and the broken short fiber is ground into micro powder to obtain plant fiber micro powder.

[0013] (2) Mix the plant fiber powder and the plant oil in a certain proportion to obtain the elongation agent.

[0014] In some embodiments that may include the above embodiments, in step (1), the baking temperature is 180-200°C and the baking time is 1-2 hours.

[0015] In some embodiments that may include the above embodiments, in step (2), the stirring speed is 300-800 rpm; the stirring time is 10-30 min.

[0016] The third aspect of this application also provides the application of the above-mentioned elastomeric agent in asphalt.

[0017] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0018] 1. In the embodiments of this application, the amount of ductile agent added is small, which significantly increases the low-temperature ductility of asphalt and improves the ductility of asphalt after aging, while having little impact on the high-temperature performance and penetration of asphalt.

[0019] 2. There are many ways to add ductile agents to asphalt. For example, they can be added after shearing by colloid mill, directly added to the asphalt tank and stirred and dispersed evenly, or directly added to the asphalt and sand and gravel mixture. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Unless otherwise specified, the experimental methods used in the embodiments of this application are all conventional methods.

[0022] In the following examples and comparative examples, unless otherwise specified, all raw materials can be obtained by commercial purchase or conventional methods.

[0023] Example 1

[0024] An extender comprising the following components by weight percentage: 40% wheat straw powder and 60% soybean oil;

[0025] The preparation method of the above-mentioned elastomeric agent includes the following steps:

[0026] (1) Place the wheat straw in a 180℃ hot air drying tunnel and bake for 1 hour. After baking, break the wheat straw into short wheat straw with a length of 1-3cm. Grind the broken short wheat straw into micro powder with a particle size of 0.3mm to obtain wheat straw powder.

[0027] (2) Mix wheat straw powder and soybean oil evenly, and mix them in a high-speed mixer for 30 minutes at a speed of 800 rpm to obtain the elastomeric agent.

[0028] Example 2

[0029] The elastomeric agent provided in this embodiment is the same as that in Example 1, except that it contains 50% wheat straw powder and 50% soybean oil.

[0030] Example 3

[0031] The extruder provided in this embodiment is the same as that in Example 1, except that it contains 70% wheat straw powder and 30% soybean oil.

[0032] Example 4

[0033] The elastomeric agent provided in this embodiment is the same as that in Embodiment 1, except that it contains 50% peanut shell powder and 50% soybean oil.

[0034] Example 5

[0035] The elastomeric agent provided in this embodiment is the same as that in Example 1, except that it contains 50% soybean hull powder and 50% soybean oil.

[0036] Example 6

[0037] The elastomeric agent provided in this embodiment is the same as that in Example 1, except that it contains 50% nut shell powder and 50% soybean oil.

[0038] Example 7

[0039] The elastomeric agent provided in this embodiment can be referred to in Embodiment 1, except that it contains 10% peanut shell powder, 10% walnut shell powder, 30% wheat straw powder, 20% oleic acid, and 30% soybean oil.

[0040] Example 8

[0041] The elastomeric agent provided in this embodiment is the same as that in Example 1, except that it contains 50% wheat straw powder and 50% rapeseed oil.

[0042] Example 9

[0043] The elastomeric agent provided in this embodiment is the same as that in Embodiment 1, except that it contains 50% wheat straw powder and 50% peanut oil.

[0044] Example 10

[0045] The elastomeric agent provided in this embodiment is the same as that in Example 1, except that it contains 50% wheat straw powder and 50% sesame oil.

[0046] Example 11

[0047] The elastomeric agent provided in this embodiment is the same as that in Embodiment 1, except that it contains 50% wheat straw powder and 50% corn oil.

[0048] Comparative Example 1

[0049] Traditional aromatic oil extender, purchased from Shandong Daotong Petrochemical Co., Ltd., using environmentally friendly aromatic oil imported from Iran.

[0050] Application Example 1

[0051] The effects of the ductile agent prepared in Example 1 and the traditional aromatic oil ductile agent on the performance of SBS modified asphalt were compared and tested, and the results are shown in Table 1. Using 70# asphalt as the base asphalt, the base asphalt was heated to 180℃; SBS (LG501) was added as a modifier at a dosage of 4%; sulfur was added as a stabilizer at a dosage of 0.12%; high-speed shearing (3000 rpm) was applied for 5 minutes; subsequently, 2% of the ductile agent prepared in Example 1 and 2% of the traditional aromatic oil ductile agent were added respectively, stirred evenly, and allowed to mature at 180℃ for 1 hour for relevant performance tests.

[0052] Table 1

[0053]

[0054] As can be seen from the data in Table 1, the ductile agent prepared in Example 1 has significantly better low-temperature ductility than traditional aromatic oil ductile agents before and after asphalt aging. The asphalt has better anti-segregation properties, and its high-temperature properties (softening point, penetration), kinematic viscosity, elastic recovery, flash point and mass change are basically unaffected.

[0055] Application Example 2

[0056] The ductile agent prepared in Example 7 was added directly to SBS modified asphalt concrete, and its performance was compared with that of a traditional aromatic oil ductile agent (Comparative Example 1). According to the "Technical Specification for Construction of Highway Asphalt Pavement" JTGF40-2004, the sand and gravel ratio, SBS modified 70# asphalt, and ductile agent were added in the proportions shown in Table 2.

[0057] Table 2

[0058] Aggregate specifications 15-10mm stone 10-5mm stone 5-3mm stone Manufactured sand Mineral powder oilstone ratio Extender addition amount Mix ratio 35％ 33％ 7％ 15％ 10％ 6.0％ 0.12％

[0059] Marshall test specimens were prepared from the asphalt mixture after mixing at 165-170℃ according to the standard, and the performance was tested. The test results are shown in Table 3.

[0060] Table 3

[0061]

[0062] As can be seen from the data in Table 3, the performance of asphalt concrete with the extruder in Example 7 is not much different from that of traditional aromatic oil extruders. It is basically impermeable, the coarse aggregate is evenly distributed and tightly arranged, and it has a good interlocking effect, meeting the national standard for asphalt mixtures.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A tardant, characterized in that, It includes the following components by weight percentage: 30-70% untreated plant fiber powder and 30-70% vegetable oil; The untreated plant fiber powder is hard untreated plant fiber powder, which is at least one of rice husk powder, wheat husk powder, wheat straw powder, peanut shell powder, bean shell powder, and fruit shell powder. The particle size of the untreated plant fiber powder is ≤0.3mm; the fruit shell powder is apricot shell powder and / or walnut shell powder; the vegetable oil is at least one of oleic acid, linoleic acid, soybean oil, rapeseed oil, peanut oil, sesame oil, and corn oil. The method for preparing the elongating agent includes the following steps: (1) The hard, untreated plant fiber is baked, the baked hard, untreated plant fiber is broken into short fibers, and the broken short fibers are ground into powder to obtain untreated plant fiber powder. (2) Mix the untreated plant fiber powder and the plant oil in a certain proportion to obtain the elongation agent; In step (1), the baking temperature is 180~200℃ and the baking time is 1~2h; in step (2), the stirring speed is 300~800rpm and the stirring time is 10~30min.

2. The application of the ductile agent as described in claim 1 in asphalt.

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