A taste-free rubber asphalt composition and a method for preparing the same

Abstract

The present application relates to the technical field of asphalt pavement materials, and particularly relates to a taste-free rubber asphalt composition and a preparation method thereof.The present application is composed of the following components: rubber powder, asphalt and a taste-free agent.Through a series of designs, the present application can effectively treat the emissions of rubber asphalt, can not only adsorb typical asphalt odor-causing substances, but also can effectively adsorb benzothiazole of rubber asphalt in a targeted manner, has a taste-free effect, reduces the emission of malodorous substances in the use process of rubber asphalt, improves the construction environment of operating personnel, reduces the physical health burden of workers in the use process, can significantly reduce the environmental pollution of rubber asphalt in the use process, can make rubber asphalt be applied to more densely populated urban areas without affecting the health of residents, enhances the popularization of rubber asphalt, is green and environment-friendly, creates a green product, widens the application market of the product, and drives economic and environmental benefits.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement materials technology, specifically to a low-odor rubber asphalt composition and its preparation method. Background Technology

[0002] With the continuous development of my country's economy, people are paying increasing attention to the control of volatile organic compound (VOC) emissions and their impact on health, and the requirements for environmental protection are becoming increasingly stringent. Currently, with the continuous improvement of my country's transportation infrastructure construction, green infrastructure has become an important development direction for the industry. Rubber asphalt, as a commonly used road construction material, is widely used in the construction of transportation infrastructure. Rubber asphalt not only effectively utilizes waste tires but also improves the various performance characteristics of asphalt, resulting in significant economic benefits. However, the use of rubber asphalt emits a large amount of volatile organic compounds. These volatile organic compounds differ significantly in chemical composition from ordinary base asphalt and modified asphalt, mainly including benzothiazole, 2,2,4-trimethyl-1,2-dihydroquinoline, toluene, and acidic organic compounds.

[0003] Current odor-neutralizing asphalt products primarily reduce hydrogen sulfide emissions from asphalt. However, rubber asphalt emits a variety of pollutants, mainly sulfur-containing organic compounds, nitrogen-containing organic compounds, acids, and aromatic compounds, with hydrogen sulfide being just one type. Existing odor-neutralizing rubber asphalt products cannot comprehensively address the high-temperature emissions from rubber asphalt, leading to serious emission problems during use, harming the health of construction workers, and limiting the application scenarios of rubber asphalt. This invention addresses these problems by proposing an odor-neutralizing rubber asphalt composition and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide an odor-neutralizing rubber asphalt composition and its preparation method, which can effectively treat the emissions from rubber asphalt. It can not only adsorb typical odor-causing substances in asphalt, but also specifically and effectively adsorb benzothiazole in rubber asphalt, thereby neutralizing the odor, reducing the emission of malodorous substances during the use of rubber asphalt, improving the working environment for workers, reducing the health burden on workers during use, and allowing rubber asphalt to be applied to more densely populated urban areas without affecting the health of residents, thus enhancing the promotion of rubber asphalt.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a odor-neutralizing rubber asphalt composition, comprising the following components: rubber powder, asphalt, and odor neutralizer;

[0006] Based on the total weight of the neutral-odor rubber asphalt composition, the weight ratio of each component is as follows: 15-25 parts rubber powder, 0.1-2 parts neutralizer, and 75-85 parts asphalt.

[0007] Furthermore, it is composed of the following components in the indicated weight ratios: 20 parts of the rubber powder, 0.5 parts of the neutralizing agent, and 80 parts of the asphalt.

[0008] Furthermore, the rubber powder is waste tire rubber powder, with a rubber hydrocarbon content of not less than 50%.

[0009] Furthermore, the asphalt is 70# base asphalt, 90# base asphalt, or SBS modified asphalt.

[0010] Furthermore, the odor neutralizer is attapulgite clay.

[0011] A method for preparing a low-odor rubber asphalt composition, applicable to the aforementioned low-odor rubber asphalt composition, specifically includes the following steps:

[0012] S1: After preheating the asphalt in a 160℃ oven for 30 minutes, transfer it to the mixing drum;

[0013] S2: Transfer the mixing drum to the heating jacket, heat it to 180°C, and add the rubber powder after the temperature stabilizes;

[0014] S3: Maintain the temperature at 180℃, stir at a stirring rate of 300r / min, stir at a uniform speed for 1.5h, add the neutralizing agent and continue stirring at the same speed for 0.5h to prepare a neutralizing rubber asphalt composition. After preparation, transfer it to a sealed container for storage.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention effectively treats emissions from rubber asphalt. It not only adsorbs typical odor-causing substances from asphalt but also specifically and effectively adsorbs benzothiazoles from rubber asphalt, thus neutralizing odors and reducing emissions during use. This improves the working environment for workers, reduces their health burden, and significantly mitigates environmental pollution from rubber asphalt. It allows for the application of rubber asphalt in more densely populated urban areas without affecting residents' health, enhancing its widespread adoption. This green and environmentally friendly approach promotes green products, expands the market, and drives both economic and environmental benefits. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the attapulgite clay of the present invention;

[0018] Figure 2 This is a schematic diagram of the emission measurement structure of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1:

[0021] Please refer to the following: Figure 1 A odor-neutralizing rubber asphalt composition, specifically composed of the following components: rubber powder, asphalt, and odor neutralizer;

[0022] Based on the total weight of the neutral-odor rubber asphalt composition, the weight ratio of each component can be: 15-25 parts rubber powder, 0.1-2 parts neutralizer, and 75-85 parts asphalt.

[0023] In this embodiment, the components are specifically composed of the following parts by weight: 20 parts rubber powder, 0.5 parts deodorizing agent, and 80 parts asphalt;

[0024] Among them, the rubber powder is waste tire rubber powder, and the rubber hydrocarbon content is not less than 50%;

[0025] The asphalt can be 70# base asphalt, 90# base asphalt, or SBS modified asphalt. In this embodiment, 70# base asphalt is used.

[0026] In this embodiment, the odor neutralizer is attapulgite, which has a large number of mesopores (2-50 nm) and exhibits selective adsorption properties for organic compounds of specific molecular sizes. The basic properties of attapulgite are shown in Table 1.

[0027] surface 1 Basic properties of attapulgite soil

[0028]

[0029] The odor source tracing results of rubber asphalt indicate that the main sources of odor are benzene compounds and benzothiazoles. Therefore, targeted odor neutralization research on these two substances is needed to reduce the odor intensity of rubber asphalt and enhance its marketability. While research on odor neutralizers for asphalt is relatively in-depth both domestically and internationally, with materials such as activated carbon, nano-calcium carbonate, and zeolite being used for odor neutralization and emission reduction, there is limited research on targeted odor neutralization of rubber asphalt and its effectiveness. This invention, using materials such as attapulgite, has developed a novel odor-neutralizing rubber asphalt composition for targeted treatment of rubber asphalt emissions.

[0030] Example 2:

[0031] Please refer to Figure 2 Based on the above-described Example 1, a method for preparing a low-odor rubber asphalt composition is disclosed, the specific preparation steps of which are as follows:

[0032] S1: After preheating the asphalt in a 160℃ oven for 30 minutes, transfer it to the mixing drum; here, the asphalt used is Jingbo 70# base asphalt;

[0033] S2: Transfer the mixing drum to the heating jacket, heat it to 180°C, and add rubber powder after the temperature stabilizes; wherein, the rubber powder is waste tire rubber powder, and the rubber hydrocarbon content is not less than 50%;

[0034] S3: Maintain the temperature at 180℃, stir at a stirring rate of 300r / min, stir at a uniform speed for 1.5h, add the neutralizing agent and continue stirring at the same speed for 0.5h to prepare a neutralizing rubber asphalt composition. After preparation, transfer it to a sealed container for storage. Here, the neutralizing agent used is attapulgite.

[0035] Based on the established internal standard analysis method for asphalt emissions and indoor flue gas experiments, the flue gas emission behavior of odorless rubber asphalt compositions with 1%, 3%, and 5% (external admixture) of attapulgite clay was studied (hereinafter referred to as odorless rubber asphalt compositions with external admixture (hereinafter referred to as 1%ATB-AR20, 3%ATB-AR20, and 5%ATB-AR20) respectively.

[0036] Examples of preparation and detection of 1% ATB-AR20, 3% ATB-AR20, and 5% ATB-AR20;

[0037] The prepared 1% ATB-AR20, 3% ATB-AR20, and 5% ATB-AR20 were used to study flue gas emissions. The emission concentrations of each substance are as follows: Figure 2 As shown, from Figure 2 The results show that the addition of attapulgite significantly reduced the emission concentration of benzothiazole. The benzothiazole emission of rubber asphalt with a 5% attapulgite content was reduced by 82.9% compared to rubber asphalt without attapulgite, demonstrating a significant reduction in benzothiazole emissions and also showing some effect in inhibiting alkane emissions.

[0038] Attapulgite also showed a significant inhibitory effect on naphthalene and xylene emissions. When the attapulgite content was 1%, the inhibition of benzene series compounds and PAHs in rubber asphalt emissions was relatively limited, while the emissions of ethylbenzene, para-xylene, and m-xylene from 5% ATB-AR20 were reduced by 6.3% compared to AR20, showing a significant effect.

[0039] It is worth noting that 1% ATB-AR20 showed good inhibition of benzothiazole, reducing its emissions. This suggests that attapulgite may have a higher adsorption priority for benzothiazole than for xylene-like emissions. Attapulgite has limited inhibition of some high-boiling-point emissions and may even cause an increase in the emissions of some characteristic rubber asphalt emissions, such as 2,2,4-trimethyl-1,2-dihydroquinoline. However, attapulgite exhibits good targeted treatment of the main odorous emissions from rubber asphalt (benzothiazole and xylene-like emissions).

[0040] In summary, the odor-neutralizing rubber asphalt composition and its preparation method provided by this invention can effectively treat the emissions from rubber asphalt. It can not only adsorb typical odor-causing substances in asphalt but also specifically and effectively adsorb benzothiazoles in rubber asphalt, thus neutralizing odors and reducing the emission of malodorous substances during the use of rubber asphalt. This improves the working environment for workers, reduces the health burden on workers during use, and significantly reduces environmental pollution caused by rubber asphalt. It allows rubber asphalt to be used in more densely populated urban areas without affecting residents' health, enhancing the promotion of rubber asphalt. Furthermore, it is environmentally friendly, promotes green products, expands the product application market, and drives both economic and environmental benefits.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mild-tasting rubber asphalt composition, characterized in that, It consists of the following components: rubber powder, asphalt, and deodorizing agent; Based on the total weight of the odor-neutralizing rubber asphalt composition, the weight ratio of each component is as follows: 15-25 parts rubber powder, 0.1-2 parts odor neutralizer, and 75-85 parts asphalt. The rubber powder is waste tire rubber powder, with a rubber hydrocarbon content of not less than 50%; The odor neutralizer is attapulgite clay with a mesopore size of 2-50 nm, a decolorization rate of ≥90%, a moisture content of ≤5%, a free acid content of ≤0.1%, a pH value of 5.5-6.5, and a particle size of 200 mesh. The preparation method of the odorless rubber asphalt composition includes the following steps: S1: After preheating the asphalt in a 160℃ oven for 30 minutes, transfer it to the mixing drum; S2: Transfer the mixing drum to the heating jacket, heat it to 180°C, and add the rubber powder after the temperature stabilizes; S3: Maintain the temperature at 180℃, stir at a stirring rate of 300r / min, stir at a uniform speed for 1.5h, add the neutralizing agent and continue stirring at the same speed for 0.5h to prepare a neutralizing rubber asphalt composition. After preparation, transfer it to a sealed container for storage.

2. The odor-neutralizing rubber asphalt composition according to claim 1, characterized in that, It is composed of the following components in the indicated weight ratios: 20 parts of the rubber powder, 0.5 parts of the neutralizing agent, and 80 parts of the asphalt.

3. The odor-neutralizing rubber asphalt composition according to claim 2, characterized in that, The asphalt is 70# base asphalt, 90# base asphalt, or SBS modified asphalt.

4. A method for preparing a low-odor rubber asphalt composition, used in any one of claims 1-3, characterized in that, Includes the following steps: S1: After preheating the asphalt in a 160℃ oven for 30 minutes, transfer it to the mixing drum; S2: Transfer the mixing drum to the heating jacket, heat it to 180°C, and add the rubber powder after the temperature stabilizes; S3: Maintain the temperature at 180℃, stir at a stirring rate of 300r / min, stir at a uniform speed for 1.5h, add the neutralizing agent and continue stirring at the same speed for 0.5h to prepare a neutralizing rubber asphalt composition. After preparation, transfer it to a sealed container for storage.

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