High-performance waste mask fiber modified asphalt and preparation method thereof

Abstract

The invention discloses high-performance waste mask fiber modified asphalt and a preparation method thereof, and belongs to the technical field of asphalt, the high-performance waste mask fiber modified asphalt is prepared by mixing matrix asphalt, waste mask fibers, rubber oil, diisooctyl phthalate and tetrakis [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, the waste mask fiber modified asphalt is prepared from the following components in parts by weight: 100 parts of matrix asphalt, 2-8 parts of waste mask fiber, 1-5 parts of rubber oil, 0.5-2 parts of diisooctyl phthalate and 1-3 parts of tetra [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, and a preparation method is provided based on the raw materials. According to the invention, by adding the specific modifier, the prepared asphalt has better low-temperature performance, stability and high-temperature aging resistance, not only can the performance requirements of road construction be met, but also the environmental pollution can be relieved, and the cyclic utilization of resources is realized.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt, and in particular to a high-performance waste mask fiber modified asphalt. Background Art

[0002] In recent years, disposable medical masks have been widely used, but the disposal of discarded masks has become a serious environmental problem. A large number of disposable discarded medical masks are thrown away at will, which not only affects the beauty of the city, but also may cause long-term ecological pollution. The decomposition of masks takes a long time and releases harmful substances, causing pollution to the soil and water sources.

[0003] In response to this problem, some scholars have begun to pay attention to how to recycle discarded masks. One method is to use disposable discarded medical masks in the preparation of modified asphalt. However, the modified asphalt prepared from discarded masks has certain defects in performance, such as poor low-temperature performance, which seriously affects the road performance of discarded mask modified asphalt. In recent years, high temperature weather has occurred frequently, so it is also crucial to further enhance the high-temperature anti-aging ability of modified asphalt.

[0004] To address this issue, in an invention patent with publication number CN114933812A and patent name "A high-performance composite modified asphalt based on modified discarded disposable medical masks and its preparation method", SBR is added to the modified asphalt of disposable discarded medical masks to improve its low-temperature performance and anti-aging properties; although this method improves the low-temperature performance and anti-aging properties of the modified asphalt to a certain extent, SBR will also produce aggregation and segregation in the asphalt, affecting the stability of the modified asphalt, which hinders the application and promotion of modified asphalt in engineering.

[0005] Based on this, a high-performance waste mask fiber modified asphalt is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a high-performance waste mask fiber modified asphalt and a preparation method thereof to solve the problems in the background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides a high-performance waste mask fiber modified asphalt, which is prepared by mixing base asphalt, waste mask fiber, rubber oil, diisooctyl phthalate, and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. The amount of each component is as follows in parts by weight: 100 parts of base asphalt, 2 to 8 parts of waste mask fiber, 1 to 5 parts of rubber oil, 0.5 to 2 parts of diisooctyl phthalate and 1 to 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0008] Preferably, the amounts of the components used are as follows, in parts by weight: 100 parts of base asphalt, 4.2 parts of waste mask fibers, 1.5 parts of rubber oil, 0.8 parts of diisooctyl phthalate and 1.3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0009] Preferably, the amounts of the components are as follows, in parts by weight: 100 parts of base asphalt, 4.4 parts of waste mask fibers, 1.7 parts of rubber oil, 1 part of diisooctyl phthalate and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0010] Preferably, the amounts of the components used are as follows, in parts by weight: 100 parts of base asphalt, 4.6 parts of waste mask fibers, 1.9 parts of rubber oil, 1.2 parts of diisooctyl phthalate and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0011] Preferably, the amounts of the components used are as follows, in parts by weight: 100 parts of base asphalt, 4.8 parts of waste mask fibers, 2.1 parts of rubber oil, 1.4 parts of diisooctyl phthalate and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0012] Preferably, the amounts of the components are as follows, in parts by weight: 100 parts of base asphalt, 5.0 parts of waste mask fibers, 2.3 parts of rubber oil, 1.5 parts of diisooctyl phthalate and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0013] The present invention also provides a method for preparing waste mask fiber modified asphalt, comprising the following steps: S1. Wash the discarded disposable medical masks and place them in a 100°C oven for high-temperature sterilization for 60 minutes. S2. Remove the ear ropes and plastic strips on both sides of the treated disposable medical mask, cut the remaining part into strips of equal width, put them into a crusher for shearing for 10 minutes, and obtain waste mask fibers; S3, mixing the rubber oil and the waste mask fiber, and letting it stand for 30 minutes to obtain swollen waste mask fiber; S4. After heating the base asphalt to 175-180°C, mix it with the swollen waste mask fibers and place it in a high-speed shearing machine for high-speed shearing; then move it into a blender and add pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and stir for 30 min; finally, add diisooctyl phthalate and continue stirring for 30 min to prepare waste mask fiber modified asphalt.

[0014] Preferably, in S4, high-speed shearing is performed at 4000 rpm / min, and the shearing time is 40 min.

[0015] Therefore, the present invention provides a high-performance waste mask fiber modified asphalt and a preparation method thereof, which has the following beneficial effects: (1) In the present invention, waste mask fibers can be cross-linked in asphalt to form a network structure, which restricts the flow of asphalt at high temperatures, thereby improving its high-temperature performance.

[0016] (2) By adding specific modifiers, the performance of asphalt is improved, so that the prepared asphalt has better low-temperature performance, stability and high-temperature aging resistance; among them, rubber oil can make the discarded mask fibers fully swell and improve the fusion effect with asphalt; pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] can capture and neutralize free radicals in asphalt, thereby slowing down or preventing the oxidation reaction and improving the high-temperature aging resistance of asphalt; diisooctyl phthalate can improve the low-temperature ductility of asphalt.

[0017] (3) The disposable waste mask modified asphalt prepared by the present invention can not only meet the performance requirements of road construction, but also the main ingredients of the raw materials, waste mask fibers and rubber oil, are derived from domestic waste, which have a wide range of sources and good environmental benefits. It can alleviate environmental pollution and realize the recycling of resources. This is of great significance for promoting China's road construction to develop in a more environmentally friendly and efficient direction.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a microstructure diagram of Example 1 of the present invention. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0022] In the following Examples 1-5, the base asphalt is 70# base asphalt, with a needle penetration of 68 (0.1 mm), a softening point of 46.8°C, an elongation of more than 100 cm at 25°C, a brittle fracture at 5°C, and a Brookfield viscosity of 225 Pa·s at 60°C; the rubber oil is a byproduct of thermal cracking of waste tires.

[0023] Example 1

[0024] A kind of waste mask fiber modified asphalt, specific preparation steps: S1. Wash the discarded disposable medical masks and sterilize them in a 100℃ oven for 60 minutes. S2. Remove the ear ropes and plastic strips on both sides of the treated disposable medical mask, cut the remaining main body into strips of equal width, put them into a crusher for shearing for 10 minutes, and obtain waste mask fibers; S3. According to the weight ratio, 1.5 parts of rubber oil and 4.2 parts of waste mask fibers were mixed and stirred, and allowed to stand for 30 minutes to obtain swollen waste mask fibers; S4. After heating 100 parts of base asphalt to 175-180°C, mix it with the swollen waste mask fibers and place it in a high-speed shearing machine for high-speed shearing at 4000 rpm / min for 40 min; then add 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and stir for 30 min; finally, add 0.8 parts of diisooctyl phthalate and continue stirring for 30 min to prepare waste mask fiber modified asphalt.

[0025] The obtained product was tested and its microstructure was as follows Figure 1 shown.

[0026] Example 2

[0027] The specific preparation steps are the same as those in Example 1, except that the proportions of the materials are adjusted to 100 parts of matrix asphalt, 4.4 parts of waste mask fibers, 1.7 parts of rubber oil, 1 part of diisooctyl phthalate, and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0028] Example 3

[0029] The specific preparation steps are the same as those in Example 1, except that the proportions of the materials are adjusted to 100 parts of matrix asphalt, 4.6 parts of waste mask fibers, 1.9 parts of rubber oil, 1.2 parts of diisooctyl phthalate, and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0030] Example 4

[0031] The specific preparation steps are the same as those in Example 1, except that the proportions of the materials are adjusted to 100 parts of matrix asphalt, 4.8 parts of waste mask fibers, 2.1 parts of rubber oil, 1.4 parts of diisooctyl phthalate, and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0032] Example 5

[0033] The specific preparation steps are the same as those in Example 1, except that the proportions of the materials are adjusted to 100 parts of matrix asphalt, 5.0 parts of waste mask fibers, 2.3 parts of rubber oil, 1.5 parts of diisooctyl phthalate, and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0034] The performance of the products obtained in the above Examples 1-5 was tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) and the "Technical Specifications for Highway Asphalt Pavement Construction" (JTG E20-2011), with SBS modified asphalt as the control group. The test results are shown in Table 1 below.

[0035] Table 1 Basic performance indicators of modified asphalt

[0036] According to the results, the performance of Examples 1-5 all meet the modified asphalt engineering standards. Among them, the high temperature aging resistance and construction workability are better than SBS modified asphalt. Among them, the performance of Example 4 is the best, and the comprehensive performance is equivalent to that of SBS modified asphalt.

[0037] Therefore, the present invention provides a high-performance waste mask fiber modified asphalt and a preparation method thereof. By adding a specific modifier, the prepared asphalt has better low-temperature performance, stability and high-temperature aging resistance, which can not only meet the performance requirements of road construction, but also alleviate environmental pollution and realize the recycling of resources.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A high-performance waste mask fiber modified asphalt, characterized in that: The method is prepared by mixing base asphalt, waste mask fibers, rubber oil, diisooctyl phthalate, and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. The amounts of the components are as follows, in parts by weight: 100 parts of base asphalt, 2 to 8 parts of waste mask fibers, 1 to 5 parts of rubber oil, 0.5 to 2 parts of diisooctyl phthalate, and 1 to 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

2. A high-performance waste mask fiber modified asphalt according to claim 1, characterized in that: In parts by weight, the amounts of the components are as follows: 100 parts of base asphalt, 4.2 parts of waste mask fibers, 1.5 parts of rubber oil, 0.8 parts of diisooctyl phthalate and 1.3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

3. A high-performance waste mask fiber modified asphalt according to claim 1, characterized in that: In parts by weight, the amounts of the components are as follows: 100 parts of base asphalt, 4.4 parts of waste mask fibers, 1.7 parts of rubber oil, 1 part of diisooctyl phthalate and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

4. A high-performance waste mask fiber modified asphalt according to claim 1, characterized in that: In parts by weight, the amounts of the components are as follows: 100 parts of base asphalt, 4.6 parts of waste mask fibers, 1.9 parts of rubber oil, 1.2 parts of diisooctyl phthalate and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

5. A high-performance waste mask fiber modified asphalt according to claim 1, characterized in that: In parts by weight, the amounts of the components are as follows: 100 parts of base asphalt, 4.8 parts of waste mask fibers, 2.1 parts of rubber oil, 1.4 parts of diisooctyl phthalate and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

6. A high-performance waste mask fiber modified asphalt according to claim 1, characterized in that: In parts by weight, the amounts of the components are as follows: 100 parts of base asphalt, 5.0 parts of waste mask fibers, 2.3 parts of rubber oil, 1.5 parts of diisooctyl phthalate and 1.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

7. A method for preparing high-performance waste mask fiber modified asphalt according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Wash the discarded disposable medical masks and place them in a 100°C oven for high-temperature sterilization for 60 minutes; S2. Remove the ear ropes and plastic strips on both sides of the treated disposable medical mask, cut the remaining part into strips of equal width, put them into a crusher for shearing for 10 minutes, and obtain waste mask fibers; S3, mixing the rubber oil and the waste mask fiber, and letting it stand for 30 minutes to obtain swollen waste mask fiber; S4. After heating the base asphalt to 175-180°C, mix it with the swollen waste mask fibers and place it in a high-speed shearing machine for high-speed shearing; then move it into a blender and add pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and stir for 30 min; finally, add diisooctyl phthalate and continue stirring for 30 min to prepare waste mask fiber modified asphalt.

8. The method for preparing a high-performance waste mask fiber modified asphalt according to claim 7, characterized in that: In S4, high-speed shearing is performed at 4000 rpm / min, and the shearing time is 40 min.

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