Composite modified waste cooking oil biological asphalt mixture and preparation method thereof

Abstract

The invention discloses a composite modified waste cooking oil biological asphalt mixture and a preparation method thereof. The asphalt mixture comprises the following substances in percentage by mass: 4-7wt% of biological asphalt, 89-92wt% of aggregate, 2-3wt% of mixed mineral powder and 0.5-1.0 wt% of lignin fiber, the biological asphalt is prepared from the following substances in percentage by mass: 50 to 58 weight percent of matrix asphalt, 18 to 20 weight percent of waste cooking oil, 15 to 18 weight percent of mixed rubber powder, 2 to 2.5 weight percent of polymer modifier, 6 to 8 weight percent of mixed resin and 1 to 1.5 weight percent of additive. The preparation method comprises the following steps: preparing biological asphalt; respectively putting the aggregates with various grades of particle sizes, the mixed mineral powder and the biological asphalt into a drying oven for heating; sequentially putting the biological asphalt and the aggregate with various grades of particle sizes into a mixing pot, and mixing; sequentially adding the mixed mineral powder and the lignin fiber into the mixing pot, and continuously mixing to obtain the composite modified waste cooking oil biological asphalt mixture. The biological asphalt is prepared in a layer-by-layer progressive mode, and the technical problem that the doping amount of the waste cooking oil and the performance of the biological asphalt are difficult to achieve balance is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of road engineering material preparation, and in particular relates to a composite modified restaurant waste oil bio-asphalt mixture and a preparation method thereof. Background Art

[0002] In recent years, global oil reserves have been declining annually, while future demand for oil resources is expected to continue to rise, leading to accelerating energy consumption. Asphalt, as a byproduct of the oil industry, is directly affected by oil reserves, leading to a continuous rise in the price of road asphalt raw materials. At the same time, the growing demand for road network construction and maintenance in my country is exacerbating the supply and demand imbalance of raw materials. Therefore, finding alternative materials to asphalt is crucial to achieving sustainable development in road construction.

[0003] Waste cooking oil has lost its edible value because it contains a large number of substances harmful to the human body. According to statistics, my country generates nearly 8 million tons of waste cooking oil annually, accounting for approximately 25% of the global annual total. However, it is worth noting that this special waste is rich in low-carbon chain biomass components (including fatty acids, polycyclic aromatic hydrocarbons, etc.), whose main components are carbon, hydrogen, and oxygen, which are highly similar to the chemical element composition of petroleum asphalt. Due to the similar characteristics of this chemical structure, waste cooking oil has good compatibility with petroleum asphalt, so it has the potential for resource recycling.

[0004] A new, environmentally friendly bio-asphalt made from waste cooking oil can partially replace petroleum asphalt. As a petroleum asphalt alternative, it offers multiple advantages: First, it aligns with sustainable development strategies, significantly reducing the cost of road construction materials through resource recycling. Second, it transforms food waste into high-value-added industrial products, effectively addressing food safety concerns caused by waste cooking oil returning to the table and reducing its negative impact on the ecological environment. This innovative waste-to-treasure approach not only achieves both environmental and economic benefits but also opens up new avenues for the comprehensive management of food waste, demonstrating broad application prospects in the field of road construction materials.

[0005] Currently, bio-asphalt still faces key technical bottlenecks in achieving large-scale industrial application. Existing research shows that while various bio-oil feedstocks can effectively improve asphalt's low-temperature and fatigue performance, when the bio-oil content exceeds a certain threshold, the asphalt's softening point drops significantly, while its high-temperature performance deteriorates sharply. This dosage-dependent performance fluctuation makes it difficult for current bio-asphalt technology to achieve an optimal balance between biomass feedstock utilization and material performance, which has become a core obstacle to the industrialization and promotion of bio-asphalt.

[0006] Patent application publication number CN106947271A discloses a composite modified asphalt based on multiple biomass materials and its preparation method. The composite modified asphalt comprises, by weight, 100 parts base asphalt, 2.5-5 parts waste cooking oil, 10-20 parts scrap rubber powder, 2-4 parts soybean fatty acid, 1-3 parts yak dung, 2-4 parts coffee grounds, 1-3 parts boron nitride, 0.5-1.5 parts 2-hydroxy-4-methoxybenzophenone, and 0.1-0.15 parts stabilizer. The preparation method comprises: sequentially adding waste cooking oil, soybean fatty acid, yak dung, and coffee grounds to the heated base asphalt, stirring, and then adding the scrap rubber powder; heating and shearing the mixture, then adding the boron nitride, 2-hydroxy-4-methoxybenzophenone, and stabilizer, and stirring.

[0007] Patent application publication number CN116768531A discloses a high-content TB rubber-modified asphalt mixture and its preparation method. The asphalt mixture comprises the following raw materials by weight: 4.0-6.0 parts TB rubber-modified asphalt, 2-4 parts rubber granules, 0.3-0.5 parts waste cooking oil, 8-12 parts mineral powder, and 75-85 parts aggregate. The TB rubber-modified asphalt comprises 20-40% rubber powder, 6-8% waste cooking oil, and the remainder is base asphalt. The preparation method comprises: adding rubber powder and waste cooking oil to heated base asphalt, heating and shearing to obtain TB rubber-modified asphalt; adding rubber granules to the waste cooking oil and stirring, then mixing with aggregate and mineral powder; and finally, adding the TB rubber-modified asphalt and stirring to obtain the asphalt mixture.

[0008] Both of the above patented technologies use waste catering oil (such as waste cooking grease and waste cooking oil) and rubber powder, but the amount of both added is relatively low, and during the preparation process, all kinds of substances are directly added and stirred uniformly without considering the impact of adding raw materials layer by layer on the material properties.

[0009] In summary, due to the adverse effects of bio-oil on the high-temperature performance of bio-asphalt, existing technologies have been forced to control the bio-oil blending ratio to a low range, or use high-value modifiers (such as polyurethane and large amounts of SBS) to achieve a balance in performance. However, these modifiers are themselves high-value industrial products and are expensive, which in turn weakens the economic and environmental advantages of bio-asphalt. In addition, existing research on the use of low-density bio-oils such as restaurant waste oil to prepare bio-asphalt is still insufficient. Therefore, if low-value-added modifiers or direct use of solid waste products can be used to achieve bio-asphalt performance control at higher bio-oil content, it will not only improve the technical feasibility but also enhance the sustainability of bio-asphalt, and has important technical development value and resource reuse potential. Summary of the Invention

[0010] In order to solve the problems existing in the prior art, the present invention provides a composite modified catering waste oil bio-asphalt mixture, wherein the mass percentage of each substance in the asphalt mixture is 4-7wt% of bio-asphalt, 89-92wt% of aggregate, 2-3wt% of mixed mineral powder, and 0.5-1.0wt% of lignin fiber; the mass percentage of each substance in the bio-asphalt is 50-58wt% of matrix asphalt, 18-20wt% of catering waste oil, 15-18wt% of mixed rubber powder, 2-2.5wt% of polymer modifier, 6-8wt% of mixed resin, and 1-1.5wt% of additive.

[0011] Preferably, the mixed rubber powder is formed by mixing rubber powder of three particle sizes, the three particle sizes being 180-250 μm, 150-180 μm and 125-150 μm, respectively. The mass percentage of each particle size in the mixed rubber powder is 5-10 wt% for 180-250 μm, 80-90 wt% for 150-180 μm and 5-10 wt% for 125-150 μm.

[0012] In any of the above schemes, preferably, the mixed resin consists of C9 petroleum resin and copolymerized petroleum resin, and the mass percentage of each substance in the mixed resin is 80-85wt% of C9 petroleum resin and 15-20wt% of copolymerized petroleum resin.

[0013] In any of the above schemes, it is preferred that the auxiliary agent consists of sulfur and Sasobit warm mix agent, and the mass percentage of each substance in the auxiliary agent is 20-30wt% of sulfur and 70-80wt% of Sasobit warm mix agent.

[0014] In any of the above schemes, preferably, the base asphalt is No. 70 base asphalt or No. 90 base asphalt; and the polymer modifier is industrial 791 linear SBS modifier.

[0015] In any of the above schemes, it is preferred that the aggregate includes five particle sizes, namely, particle size 13.2-16mm, particle size 9.5-13.2mm, particle size 5-9.5mm, particle size 3-5mm, and particle size 0-3mm, and the mass percentage of each particle size in the aggregate is, particle size 13.2-16mm accounts for 5-10wt%, particle size 9.5-13.2mm accounts for 23-27wt%, particle size 5-9.5mm accounts for 15-20wt%, particle size 3-5mm accounts for 23-27wt%, and particle size 0-3mm accounts for 25-30wt%.

[0016] In any of the above schemes, preferably, the mixed mineral powder consists of phosphogypsum powder and calcium carbonate mineral powder, and the mass percentage of each substance in the mixed mineral powder is 30-40wt% of phosphogypsum powder and 60-70wt% of calcium carbonate mineral powder.

[0017] The present invention also provides a method for preparing a composite modified waste catering oil bio-asphalt mixture, which is used to prepare any of the composite modified waste catering oil bio-asphalt mixtures described above, and comprises the following steps in order:

[0018] Step 1: Prepare bio-asphalt according to the designed material ratio and process flow;

[0019] Step 2: Place aggregates of various particle sizes, mixed mineral powder, and bio-asphalt in an oven and heat them separately. After heating, keep them warm for later use.

[0020] Step 3: Preheat the mixing pot to the same temperature as the aggregate, put the bio-asphalt into the mixing pot first, then add aggregates of various particle sizes on top of the bio-asphalt, and then mix;

[0021] Step 4: After the bio-asphalt is mixed with aggregates of various particle sizes, the mixed mineral powder and lignin fiber are added to the mixing pot in turn for mixing. After the mixing of all materials is completed, the composite modified catering waste oil bio-asphalt mixture can be obtained.

[0022] Preferably, in step 1, the method for preparing bio-asphalt comprises the following steps in order:

[0023] Step (1): weighing base asphalt, restaurant waste oil, mixed rubber powder, polymer modifier, mixed resin, and additives according to the designed material ratio;

[0024] Step (2): pre-treating the restaurant waste oil. The pre-treatment process is as follows: first, placing the restaurant waste oil, bamboo charcoal, and activated carbon into a stirring container, wherein the amount of bamboo charcoal and activated carbon added is 10-15% of the total amount of the restaurant waste oil; then placing the stirring container into an oil bath pot of a high-speed stirring disperser, stirring while heating at a stirring speed of 1200-1500 r / min, and continuing to stir for 1.5-2 hours after heating to 140-160° C.; finally, cooling after the stirring is completed, and filtering out the bamboo charcoal and activated carbon, thereby completing the pre-treatment of the restaurant waste oil;

[0025] Step (3): placing the matrix asphalt in an oven and heating it to a fluid state at a temperature of 140-150° C. for 2-3 hours, and keeping it warm for later use after the heating is completed; placing the pretreated catering waste oil in an oven and heating it at a temperature 10-15° C. higher than the heating temperature of the matrix asphalt for 1.5-2 hours, and keeping it warm for later use after the heating is completed;

[0026] Step (4): Place all the matrix asphalt being insulated into a stirring container, then place the stirring container into an oil bath pot of a high-speed stirring disperser, and heat while stirring at a stirring speed of 800-1000 r / min. When the temperature is heated to a temperature 10-15°C higher than the heating temperature of the matrix asphalt in the oven, add the restaurant waste oil being insulated into the stirring container in an amount of 20-30% of the total amount of the restaurant waste oil. While keeping the stirring speed and heating temperature unchanged, continue stirring for 10-15 minutes to allow the matrix asphalt and the restaurant waste oil to fuse;

[0027] Step (5): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 125-150 μm in the mixed rubber powder and the copolymerized petroleum resin in the mixed resin are placed in a stirring container and stirred continuously for 10-15 minutes to mix the substances;

[0028] Step (6): While maintaining the stirring speed and heating temperature unchanged, add all the polymer modifiers into the stirring container and continue stirring for 20-25 minutes to mix the substances;

[0029] Step (7): while maintaining the stirring speed constant, the temperature is raised while stirring, and after the temperature rises by 10-15° C., the cooking waste oil being kept warm is added to the stirring container in an amount of 20-30% of the total amount of the cooking waste oil, and then the stirring speed is increased to 1200-1500 r / min, and the stirring is continued for 10-15 minutes to mix the substances;

[0030] Step (8): While maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 180-250 μm in the mixed rubber powder and the C9 petroleum resin in the mixed resin are placed in a stirring container and stirred continuously for 15-25 minutes to mix the substances;

[0031] Step (9): While maintaining the stirring speed and heating temperature unchanged, add all the remaining catering waste oil into the stirring container and continue stirring for 10-15 minutes to mix the substances;

[0032] Step (10): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 150-180 μm in the mixed rubber powder is placed in a stirring container and stirred continuously for 15-25 minutes to mix the materials;

[0033] Step (11): while maintaining the stirring speed and heating temperature unchanged, add all the additives into the stirring container and continue stirring for 10-15 minutes to mix all the substances;

[0034] Step (12): placing the stirring container containing the substances into a high-speed shearing machine, first heating it to a temperature 3-5°C higher than the temperature of the substances in the high-speed stirring disperser, and then shearing and stirring it at a shear stirring speed of 4500-5500 r / min and a shear stirring time of 45-60 min;

[0035] Step (13): Place the stirring container containing each substance into a high-speed stirring disperser, first heat it to a temperature 10-15°C lower than the temperature of each substance in the high-speed shearing machine, and then stir it at a stirring speed of 600-800 r / min and a stirring time of 1-1.5 h; Step (14): Take the stirring container containing each substance out of the high-speed stirring disperser and cool it to room temperature by self-heating to obtain bio-asphalt.

[0036] In any of the above schemes, it is preferred that in step 2, the heating temperature of aggregates of various particle sizes and mixed mineral powder is 170-180°C, and the heating time is 2.5-3h; the heating temperature of bio-asphalt is 3-5°C lower than the heating temperature of aggregates of various particle sizes and mixed mineral powder, and the heating time is 2.5-3h; in step 3, the mixing speed of aggregates of various particle sizes and bio-asphalt is 400-500r / min, and the mixing time is 45-60s; in step 4, after adding mixed mineral powder and lignin fiber, the mixing speed of each material is 400-500r / min, and the mixing time is 45-60s.

[0037] The oven, mixing pot, high-speed stirring disperser, high-speed shearing machine, etc. used in the present invention are all conventional equipment in this field, and there are no special requirements on the model and structure of the equipment.

[0038] The waste cooking oil used in this invention primarily includes oil extracted from leftovers, waste oil generated during frying, and oil collected from restaurant kitchen grease traps. The Sasobit warm mix agent used in this invention is a polyolefin asphalt modifier whose main chemical components are synthetic long-chain saturated hydrocarbons.

[0039] In the present invention, the mixed rubber powder is mixed with rubber powder of three particle sizes, namely, 180-250 μm, 150-180 μm, and 125-150 μm, that is, 180 μm ≤ particle size < 250 μm, 150 μm ≤ particle size < 180 μm, and 125 μm ≤ particle size < 150 μm. The aggregate includes five particle sizes, namely, 13.2-16 mm, 9.5-13.2 mm, 5-9.5 mm, 3-5 mm, and 0-3 mm, that is, 13.2 mm ≤ particle size < 16 mm, 9.5 mm ≤ particle size < 13.2 mm, 5 mm ≤ particle size < 9.5 mm, 3 mm ≤ particle size < 5 mm, and 0 mm < particle size < 3 mm. For each particle size, the material passes through the upper and lower sieve holes in sequence to obtain a particle size between the upper and lower sieve holes, for example: the particle size is 9.5-13.2mm (9.5mm≤particle size<13.2mm), that is, the material passes through the 13.2mm sieve hole and the 9.5mm sieve hole in sequence to obtain a particle size between 9.5-13.2mm.

[0040] In the process of preparing the asphalt mixture of the present invention, the selection of each substance, the mass percentage of each substance, the order of addition of each substance, and the process parameters of each step are all very important, especially the preparation method of bio-asphalt, which plays a key role. Throughout the preparation process of bio-asphalt, the selection and ratio of each substance, the order of addition of each substance, and the process parameters are all very critical. In particular, the layer-by-layer preparation process limits the timing of adding waste cooking oil and rubber powder. The waste cooking oil is added at three time points, and the rubber powder of three particle sizes is also added at three time points. The waste cooking oil and the rubber powder of three particle sizes are added alternately. The synergistic effect of the various formulation parameters and process parameters is combined to achieve the expected technical effects of the present invention.

[0041] The composite modified restaurant waste oil bio-asphalt mixture and its preparation method of the present invention have the following beneficial effects:

[0042] (1) The present invention uses waste cooking oil to replace part of natural asphalt, and adds mixed resin and mixed rubber powder to prepare it into an asphalt material that can meet the requirements of road use; at the same time, additives and polymer modifiers are added to prevent segregation, reduce the mixing temperature and further enhance the performance of bio-asphalt, thereby obtaining a composite modified bio-asphalt.

[0043] (2) The proportion of waste cooking oil incorporated into the present invention is relatively high, and a relatively high proportion of waste rubber powder is consumed in the preparation process of bio-asphalt, which has a high environmental value.

[0044] (3) In the preparation process of bio-asphalt, the present invention controls the addition amount of natural asphalt to within 60%, and limits the addition ratio of industrial products such as SBS to a lower level, which has high economic value.

[0045] (4) The present invention adopts a layer-by-layer progressive method to prepare bio-asphalt, and at the same time combines the synergistic effect of various formula parameters and process parameters to solve the technical problem of achieving a balance between the amount of catering waste oil and rubber powder added and the performance of bio-asphalt.

[0046] (5) The bio-asphalt and asphalt mixture prepared by the present invention have high comprehensive performance and meet the requirements of road performance.

[0047] (6) The present invention realizes the reuse of waste resources such as waste cooking oil and rubber powder, reduces the consumption of non-renewable resources such as natural petroleum asphalt, effectively alleviates the dependence of road construction on non-renewable resources, and provides a new way to promote green road construction and circular economy development. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a preparation process of bio-asphalt according to a preferred embodiment of the composite modified catering waste oil bio-asphalt mixture and the preparation method thereof of the present invention;

[0049] Figure 2 for Figure 1 Photos of the materials used to prepare bio-asphalt in the examples shown, including: (a) waste cooking oil, (b) mixed rubber powder, (c) polymer modifier, (d) mixed resin, and (e) auxiliary agent;

[0050] Figure 3 for Figure 1 Photos of the pre-treated waste cooking oil in the embodiment shown;

[0051] Figure 4 for Figure 1 Photos of the operation process of step (4) in the bio-asphalt preparation process of the illustrated embodiment, wherein: (a) is a photo of adding waste cooking oil to the base asphalt, and (b) is a photo of the base asphalt and waste cooking oil being mixed and stirred;

[0052] Figure 5 for Figure 1 Photos of the operation process of step (5) in the bio-asphalt preparation process of the illustrated embodiment, wherein: (a) is a photo of adding rubber powder with a particle size of 125-150 μm to a stirring vessel, (b) is a photo of adding copolymerized petroleum resin to a stirring vessel, and (c) is a photo of mixing and stirring the various substances;

[0053] Figure 6 for Figure 1Photos of the operation process of step (6) in the bio-asphalt preparation process of the illustrated embodiment, wherein: (a) is a photo of adding a polymer modifier to a stirring vessel, and (b) is a photo of mixing and stirring the various substances;

[0054] Figure 7 for Figure 1 Photos of the operation process of step (7) in the bio-asphalt preparation process of the illustrated embodiment, wherein: (a) is a photo of adding waste cooking oil to a stirring container, and (b) is a photo of mixing and stirring the various substances;

[0055] Figure 8 for Figure 1 Photos of the operation process of step (8) in the bio-asphalt preparation process of the illustrated embodiment, wherein: (a) is a photo of adding rubber powder with a particle size of 180-250 μm to a stirring vessel, (b) is a photo of adding C9 petroleum resin to a stirring vessel, and (c) is a photo of mixing and stirring the various substances;

[0056] Figure 9 for Figure 1 Photos of the operation process of step (9) in the bio-asphalt preparation process of the illustrated embodiment, wherein: (a) is a photo of adding waste cooking oil to a stirring container, and (b) is a photo of mixing and stirring the various substances;

[0057] Figure 10 for Figure 1 Photos of the operation process of step (10) in the bio-asphalt preparation process of the illustrated embodiment, wherein: (a) is a photo of adding rubber powder with a particle size of 150-180 μm to a stirring container, and (b) is a photo of mixing and stirring the various substances;

[0058] Figure 11 for Figure 1 Photos of the operation process of step (11) in the bio-asphalt preparation process of the illustrated embodiment, wherein: (a) is a photo of adding an additive to a stirring container, and (b) is a photo of mixing and stirring the various substances;

[0059] Figure 12 for Figure 1 A photograph of the operation process of step (12) in the bio-asphalt preparation process of the embodiment shown, i.e., a photograph of placing a stirring container containing various substances into a high-speed shearing machine for mixing and stirring;

[0060] Figure 13 for Figure 1 A photograph of the operation process of step (13) in the bio-asphalt preparation process of the embodiment shown, i.e., a photograph of placing a stirring container containing various substances into a high-speed stirring and dispersing machine for mixing and stirring;

[0061] Figure 14 for Figure 1Photos of composite modified restaurant waste oil bio-asphalt mixture specimens prepared in the examples shown;

[0062] Figure 15 The following are photos of the effects of adding all the waste cooking oil and all the mixed rubber powder at once in the bio-asphalt preparation process of two comparative examples, where: (a) is a photo of the effect of adding all the mixed rubber powder at once, and (b) is a photo of the effect of adding all the waste cooking oil at once;

[0063] Figure 16 The rheological properties test results of Example 1 and two comparative examples are shown, wherein: (a) is the rheological properties test result of Example 1, (b) is the rheological properties test result of Comparative Example 1, and (c) is the rheological properties test result of Comparative Example 2. DETAILED DESCRIPTION

[0064] In order to further understand the content of the present invention, the present invention will be described in detail below with reference to specific embodiments.

[0065] Example 1:

[0066] According to a preferred embodiment of the composite modified catering waste oil bio-asphalt mixture of the present invention, the mass percentage of each substance in the asphalt mixture is 6wt% of bio-asphalt, 91wt% of aggregate, 2.5wt% of mixed mineral powder, and 0.5wt% of lignin fiber; the mass percentage of each substance in the bio-asphalt is 54wt% of matrix asphalt, 19wt% of catering waste oil, 17wt% of mixed rubber powder, 2wt% of polymer modifier, 7wt% of mixed resin, and 1wt% of additive.

[0067] The mixed rubber powder is formed by mixing rubber powders of three particle sizes, which are 180-250 μm, 150-180 μm, and 125-150 μm, respectively. The mass percentage of each particle size in the mixed rubber powder is 8wt% for 180-250 μm, 85wt% for 150-180 μm, and 7wt% for 125-150 μm.

[0068] The mixed resin is composed of C9 petroleum resin and copolymerized petroleum resin, with the weight percentage of each substance in the mixed resin being 82% by weight of C9 petroleum resin and 18% by weight of copolymerized petroleum resin. The additives are composed of sulfur and Sasobit warm mix agent, with the weight percentage of each substance in the additive being 25% by weight of sulfur and 75% by weight of Sasobit warm mix agent. The base asphalt is No. 70 base asphalt, and the polymer modifier is an industrial 791 linear SBS modifier.

[0069] The aggregate comprises five particle sizes, namely 13.2-16 mm, 9.5-13.2 mm, 5-9.5 mm, 3-5 mm, and 0-3 mm, with the mass percentage of each particle size in the aggregate being 8 wt% for 13.2-16 mm, 25 wt% for 9.5-13.2 mm, 17 wt% for 5-9.5 mm, 25 wt% for 3-5 mm, and 25 wt% for 0-3 mm. The mixed mineral powder comprises phosphogypsum powder and calcium carbonate powder, with the mass percentage of each substance in the mixed mineral powder being 35 wt% for phosphogypsum powder and 65 wt% for calcium carbonate powder.

[0070] This embodiment also provides a method for preparing a composite modified catering waste oil bio-asphalt mixture, which is used to prepare the composite modified catering waste oil bio-asphalt mixture, and includes the following steps in order:

[0071] Step 1: Prepare bio-asphalt according to the designed material ratio and process flow;

[0072] Step 2: Place aggregates of various particle sizes, mixed mineral powder, and bio-asphalt in an oven and heat them separately. After heating, keep them warm for later use.

[0073] Step 3: Preheat the mixing pot to the same temperature as the aggregate, put the bio-asphalt into the mixing pot first, then add aggregates of various particle sizes on top of the bio-asphalt, and then mix;

[0074] Step 4: After the bio-asphalt is mixed with aggregates of various particle sizes, the mixed mineral powder and lignin fiber are added to the mixing pot in turn for mixing. After the mixing of all materials is completed, the composite modified catering waste oil bio-asphalt mixture can be obtained.

[0075] In step one, if Figure 1 As shown, the method for preparing the bio-asphalt comprises the following steps in order:

[0076] Step (1): Weigh the base asphalt, restaurant waste oil, mixed rubber powder, polymer modifier, mixed resin and additives according to the designed material ratio; the actual photos of each material are as follows: Figure 2 As shown, wherein: (a) is waste cooking oil, (b) is mixed rubber powder, (c) is polymer modifier, (d) is mixed resin, and (e) is auxiliary agent;

[0077] Step (2): pre-treat the catering waste oil. The pre-treatment process is as follows: first, put the catering waste oil, bamboo charcoal and activated carbon into a stirring container, and the amount of bamboo charcoal and activated carbon added is 12% of the total amount of catering waste oil; then put the stirring container into the oil bath pot of a high-speed stirring disperser, and heat while stirring at a stirring speed of 1350r / min. After heating to 150°C, continue stirring for 1.8h; finally, cool after the stirring is completed, and filter out the bamboo charcoal and activated carbon, thus completing the pre-treatment of the catering waste oil; the actual photo of the catering waste oil after pre-treatment is shown in the figure. Figure 3 As shown;

[0078] Step (3): placing the matrix asphalt in an oven and heating it to a fluid state at a temperature of 145° C. for 2.5 hours, and keeping it warm for later use after the heating is completed; placing the pretreated catering waste oil in an oven and heating it at a temperature 12° C. higher than the heating temperature of the matrix asphalt for 1.8 hours, and keeping it warm for later use after the heating is completed;

[0079] Step (4): put all the matrix asphalt being insulated into a stirring container, then put the stirring container into the oil bath pot of a high-speed stirring disperser, and heat while stirring at a stirring speed of 900r / min. When the temperature is heated to a temperature 12°C higher than the heating temperature of the matrix asphalt in the oven, add the restaurant waste oil being insulated into the stirring container in an amount of 25% of the total amount of the restaurant waste oil. While keeping the stirring speed and heating temperature unchanged, continue stirring for 12 minutes to allow the matrix asphalt and the restaurant waste oil to merge. The operation process of this step is as follows: Figure 4 As shown, among which: (a) is a photo of adding waste cooking oil into base asphalt, and (b) is a photo of the base asphalt and waste cooking oil being mixed and stirred;

[0080] Step (5): While keeping the stirring speed and heating temperature constant, put the rubber powder with a particle size of 125-150 μm in the mixed rubber powder and the copolymerized petroleum resin in the mixed resin into a stirring container and continue stirring for 12 minutes to mix the materials. The operation process of this step is as follows: Figure 5 As shown, among which: (a) is a photo of adding rubber powder with a particle size of 125-150 μm into a stirring container, (b) is a photo of adding copolymerized petroleum resin into a stirring container, and (c) is a photo of mixing and stirring the various substances;

[0081] Step (6): While keeping the stirring speed and heating temperature unchanged, add all the polymer modifiers into the stirring container and continue stirring for 22 minutes to mix the materials. The operation process of this step is as follows: Figure 6 As shown, wherein: (a) is a photo of adding a polymer modifier into a stirring container, and (b) is a photo of mixing and stirring the various substances;

[0082] Step (7): While keeping the stirring speed constant, raise the temperature while stirring. After the temperature rises by 12°C, continue to add the insulated catering waste oil to the stirring container in an amount of 25% of the total catering waste oil. Then increase the stirring speed to 1350r / min and continue stirring for 12 minutes to mix the substances. The operation process of this step is as follows: Figure 7 As shown, among which: (a) is a photo of adding waste cooking oil into a mixing container, and (b) is a photo of mixing and stirring the various substances;

[0083] Step (8): While keeping the stirring speed and heating temperature constant, put the rubber powder with a particle size of 180-250 μm in the mixed rubber powder and the C9 petroleum resin in the mixed resin into a stirring container and continue stirring for 20 minutes to mix the materials; the operation process of this step is as follows: Figure 8 As shown, (a) is a photo of adding rubber powder with a particle size of 180-250 μm into a stirring container, (b) is a photo of adding C9 petroleum resin into a stirring container, and (c) is a photo of mixing and stirring the various substances; Step (9): While keeping the stirring speed and heating temperature unchanged, add all the remaining catering waste oil into the stirring container and continue stirring for 12 minutes to mix the various substances; the operation process of this step is as shown in FIG. Figure 9 As shown, among which: (a) is a photo of adding waste cooking oil into a mixing container, and (b) is a photo of mixing and stirring the various substances;

[0084] Step (10): While keeping the stirring speed and heating temperature constant, put the rubber powder with a particle size of 150-180 μm in the mixed rubber powder into the stirring container and continue stirring for 20 minutes to mix the materials; the operation process of this step is as follows: Figure 10 As shown, among which: (a) is a photo of adding rubber powder with a particle size of 150-180 μm into a stirring container, and (b) is a photo of mixing and stirring the various substances;

[0085] Step (11): While keeping the stirring speed and heating temperature unchanged, add all the additives into the stirring container and continue stirring for 12 minutes to mix all the substances. The operation process of this step is as follows: Figure 11 As shown, among which: (a) is a photo of adding an additive into a stirring container, and (b) is a photo of mixing and stirring the substances;

[0086] Step (12): Place the stirring container containing each substance into a high-speed shearing machine, first heat it to a temperature 4°C higher than the temperature of each substance in the high-speed stirring disperser, and then perform shear stirring. The shear stirring speed is 5000 r / min and the shear stirring time is 52 min. The operation process of this step is as follows: Figure 12 As shown;

[0087] Step (13): Place the stirring container containing each substance into a high-speed stirring disperser, heat it to a temperature 12°C lower than the temperature of each substance in the high-speed shearing machine, and then stir it at a stirring speed of 700 r / min and a stirring time of 1.2 h. The operation process of this step is as follows: Figure 13 As shown;

[0088] Step (14): The stirring container containing the substances is taken out from the high-speed stirring disperser and cooled to room temperature by autogenous heating to obtain bio-asphalt.

[0089] In step 2, the heating temperature of aggregates of various particle sizes and mixed mineral powders is 175°C, and the heating time is 2.8h; the heating temperature of bio-asphalt is 4°C lower than the heating temperature of aggregates of various particle sizes and mixed mineral powders, and the heating time is 2.8h. In step 3, the mixing speed of aggregates of various particle sizes and bio-asphalt is 450r / min, and the mixing time is 52s. In step 4, after adding mixed mineral powder and lignin fiber, the mixing speed of each material is 450r / min, and the mixing time is 52s. The actual photo of the composite modified catering waste oil bio-asphalt mixture specimen prepared in this embodiment is shown in the figure. Figure 14 shown.

[0090] In this embodiment, the mixed rubber powder is formed by mixing rubber powder of three particle sizes: 180-250 μm, 150-180 μm, and 125-150 μm, i.e., 180 μm ≤ particle size < 250 μm, 150 μm ≤ particle size < 180 μm, and 125 μm ≤ particle size < 150 μm. The aggregate comprises five particle sizes: 13.2-16 mm, 9.5-13.2 mm, 5-9.5 mm, 3-5 mm, and 0-3 mm, i.e., 13.2 mm ≤ particle size < 16 mm, 9.5 mm ≤ particle size < 13.2 mm, 5 mm ≤ particle size < 9.5 mm, 3 mm ≤ particle size < 5 mm, and 0 mm < particle size < 3 mm. For each particle size, the material passes through the upper and lower sieve holes in sequence to obtain a particle size between the upper and lower sieve holes, for example: the particle size is 9.5-13.2mm (9.5mm≤particle size<13.2mm), that is, the material passes through the 13.2mm sieve hole and the 9.5mm sieve hole in sequence to obtain a particle size between 9.5-13.2mm.

[0091] In the asphalt mixture preparation process of this embodiment, the selection of various substances, their mass percentages, the order of addition, and the process parameters of each step are all crucial. The bio-asphalt preparation method plays a particularly crucial role. The selection and proportioning of various substances, the order of addition, and the process parameters are crucial throughout the bio-asphalt preparation process. In particular, the layer-by-layer preparation process defines the timing for adding waste cooking oil and rubber powder. The waste cooking oil and rubber powder are added at three different time points, and the addition of the three different particle sizes is also done at three different time points. Furthermore, the alternating addition of the waste cooking oil and rubber powder is crucial. The synergistic effects of the various formulation and process parameters are crucial to achieving the desired technical effects of this embodiment.

[0092] This embodiment adopts a step-by-step method to add waste cooking oil, rubber powder of three particle sizes, and mixed resin, which is conducive to the swelling and cross-linking effect among the three. After adding the waste cooking oil, rubber powder is selected to balance the additional light components brought by the addition of waste cooking oil. The swelling effect of the rubber powder is used to absorb the light components, thereby balancing the component ratio in the asphalt and stabilizing the colloidal structure. The glass transition point of waste cooking oil itself is relatively low. Its addition will cause the viscous phase transition temperature of the asphalt itself to drop, which is not conducive to the engineering application of asphalt. The addition of mixed resin plays a role in balancing the physical transition point. This is because the addition of resin changes the distribution of the molecular weight of each component in the asphalt. At the same time, the liquefied resin increases the viscosity of the asphalt, preventing the subsequent suspension phenomenon caused by the addition of polymer, thereby increasing the dispersion efficiency. Through the synergistic effect of the order and proportion of adding each substance, the three substances, namely catering waste oil, rubber powder and mixed resin, can balance the adverse effects of each other on asphalt. The three substances jointly regulate the component ratio in the asphalt and stabilize the colloidal structure, so that the polymer can play a modifying role, and finally form a composite modified bio-asphalt with balanced performance.

[0093] The composite modified catering waste oil bio-asphalt mixture and its preparation method of this embodiment have the following beneficial effects: (1) Catering waste oil is used to replace part of natural asphalt, and mixed resin and mixed rubber powder are added to prepare it into an asphalt material that can meet the requirements of road use; at the same time, additives and polymer modifiers are added to prevent segregation, reduce the mixing temperature and further enhance the performance of bio-asphalt, thereby obtaining composite modified bio-asphalt. (2) The proportion of catering waste oil added is high, and a high proportion of waste rubber powder is consumed in the preparation process of bio-asphalt, which has high environmental value. (3) In the preparation process of bio-asphalt, the addition amount of natural asphalt is controlled within 60%, and the addition ratio of industrial products such as SBS is limited to a low level, which has high economic value. (4) Bio-asphalt is prepared in a layer-by-layer progressive manner, and the synergistic effect of various formula parameters and process parameters is combined to solve the technical problem of the difficulty in achieving a balance between the addition amount of catering waste oil and the addition amount of rubber powder and the performance of bio-asphalt.

[0094] Example 2:

[0095] According to another preferred embodiment of the composite modified restaurant waste oil bio-asphalt mixture and its preparation method of the present invention, its material ratio, preparation process, addition order of each step, technical principle, equipment used, beneficial effects, etc. are basically the same as those of the first embodiment, except that:

[0096] The mass percentages of each substance in the asphalt mixture are: 7wt% of bio-asphalt, 89wt% of aggregate, 3wt% of mixed mineral powder, and 1wt% of lignin fiber; the mass percentages of each substance in the bio-asphalt are: 50wt% of matrix asphalt, 20wt% of catering waste oil, 18wt% of mixed rubber powder, 2.5wt% of polymer modifier, 8wt% of mixed resin, and 1.5wt% of additives.

[0097] The mixed rubber powder is formed by mixing rubber powders of three particle sizes, which are 180-250 μm, 150-180 μm, and 125-150 μm, respectively. The mass percentage of each particle size in the mixed rubber powder is 5wt% for 180-250 μm, 90wt% for 150-180 μm, and 5wt% for 125-150 μm.

[0098] The mixed resin is composed of C9 petroleum resin and copolymerized petroleum resin, with the weight percentage of each substance in the mixed resin being 80% C9 petroleum resin and 20% copolymerized petroleum resin. The additives are composed of sulfur and Sasobit warm mix agent, with the weight percentage of each substance in the additive being 20% sulfur and 80% Sasobit warm mix agent. The base asphalt is No. 70 base asphalt, and the polymer modifier is an industrial 791 linear SBS modifier.

[0099] The aggregate comprises five particle sizes, namely 13.2-16 mm, 9.5-13.2 mm, 5-9.5 mm, 3-5 mm, and 0-3 mm, with the mass percentage of each particle size in the aggregate being 5 wt% for 13.2-16 mm, 27 wt% for 9.5-13.2 mm, 15 wt% for 5-9.5 mm, 27 wt% for 3-5 mm, and 26 wt% for 0-3 mm. The mixed mineral powder comprises phosphogypsum powder and calcium carbonate powder, with the mass percentage of each substance in the mixed mineral powder being 30 wt% for phosphogypsum powder and 70 wt% for calcium carbonate powder.

[0100] In step 1, the method for preparing bio-asphalt comprises the following steps in order:

[0101] Step (1): weighing base asphalt, restaurant waste oil, mixed rubber powder, polymer modifier, mixed resin, and additives according to the designed material ratio;

[0102] Step (2): pre-treating the restaurant waste oil. The pre-treatment process is as follows: first, placing the restaurant waste oil, bamboo charcoal, and activated carbon into a stirring container, wherein the amount of bamboo charcoal and activated carbon added is 10% of the total amount of the restaurant waste oil; then placing the stirring container into an oil bath pot of a high-speed stirring disperser, stirring while heating at a stirring speed of 1200 r / min, and continuing to stir for 2 hours after heating to 140° C.; finally, cooling after the stirring is completed, and filtering out the bamboo charcoal and activated carbon, thereby completing the pre-treatment of the restaurant waste oil;

[0103] Step (3): placing the matrix asphalt in an oven and heating it to a fluid state at a temperature of 140° C. for 3 hours, and keeping it warm for later use after the heating is completed; placing the pretreated catering waste oil in an oven and heating it at a temperature 10° C. higher than the heating temperature of the matrix asphalt for 2 hours, and keeping it warm for later use after the heating is completed;

[0104] Step (4): Place all the matrix asphalt being insulated into a stirring container, then place the stirring container into the oil bath pot of a high-speed stirring disperser, and heat while stirring at a stirring speed of 800 r / min. When the temperature is heated to a temperature 10°C higher than the heating temperature of the matrix asphalt in the oven, add the restaurant waste oil being insulated into the stirring container in an amount of 20% of the total amount of the restaurant waste oil. While maintaining the stirring speed and heating temperature unchanged, continue stirring for 15 minutes to allow the matrix asphalt and the restaurant waste oil to merge;

[0105] Step (5): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 125-150 μm in the mixed rubber powder and the copolymerized petroleum resin in the mixed resin are placed in a stirring container and stirred continuously for 15 minutes to mix the substances;

[0106] Step (6): While maintaining the stirring speed and heating temperature unchanged, add all the polymer modifiers into the stirring container and continue stirring for 25 minutes to mix all the substances;

[0107] Step (7): while maintaining the stirring speed constant, the temperature is raised while stirring. After the temperature rises by 10° C., the cooking waste oil being kept warm is added to the stirring container in an amount of 20% of the total cooking waste oil. The stirring speed is then increased to 1200 r / min and the stirring is continued for 15 min to mix the substances.

[0108] Step (8): While maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 180-250 μm in the mixed rubber powder and the C9 petroleum resin in the mixed resin are placed in a stirring container and stirred continuously for 25 minutes to mix the substances;

[0109] Step (9): While maintaining the stirring speed and heating temperature unchanged, add all the remaining catering waste oil into the stirring container and continue stirring for 15 minutes to mix the substances;

[0110] Step (10): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 150-180 μm in the mixed rubber powder is placed in a stirring container and stirred continuously for 25 minutes to mix the materials;

[0111] Step (11): while maintaining the stirring speed and heating temperature unchanged, add all the additives into the stirring container and continue stirring for 15 minutes to mix all the substances;

[0112] Step (12): placing the stirring container containing the substances into a high-speed shearing machine, first heating it to a temperature 3°C higher than the temperature of the substances in the high-speed stirring disperser, and then shearing and stirring it at a shear stirring speed of 4500 r / min and a shear stirring time of 60 min;

[0113] Step (13): Place the stirring container containing the substances into a high-speed stirring disperser, heat it to a temperature 10°C lower than the temperature of the substances in the high-speed shearing machine, and then stir it at a stirring speed of 600 r / min for 1.5 h;

[0114] Step (14): The stirring container containing the substances is taken out from the high-speed stirring disperser and cooled to room temperature by autogenous heating to obtain bio-asphalt.

[0115] In step 2, the heating temperature for aggregates of all particle sizes and the mixed mineral powder was 170°C for 3 hours. The heating temperature for the bio-asphalt was 3°C lower than that for all particle sizes and the mixed mineral powder, and the heating time was 3 hours. In step 3, the mixing speed for all particle sizes and the bio-asphalt was 400 r / min for 60 seconds. In step 4, after adding the mixed mineral powder and lignin fiber, the mixing speed for all materials was increased to 400 r / min for 60 seconds.

[0116] Example 3:

[0117] According to another preferred embodiment of the composite modified restaurant waste oil bio-asphalt mixture and its preparation method of the present invention, its material ratio, preparation process, addition order of each step, technical principle, equipment used, beneficial effects, etc. are basically the same as those of the first embodiment, except that:

[0118] The mass percentages of each substance in the asphalt mixture are: 5wt% bio-asphalt, 92wt% aggregate, 2wt% mixed mineral powder, and 1wt% lignin fiber; the mass percentages of each substance in the bio-asphalt are: 58wt% matrix asphalt, 18wt% catering waste oil, 15wt% mixed rubber powder, 2wt% polymer modifier, 6wt% mixed resin, and 1wt% additive.

[0119] The mixed rubber powder is formed by mixing rubber powders of three particle sizes, which are 180-250 μm, 150-180 μm, and 125-150 μm, respectively. The mass percentage of each particle size in the mixed rubber powder is 10 wt% for 180-250 μm, 80 wt% for 150-180 μm, and 10 wt% for 125-150 μm.

[0120] The mixed resin is composed of C9 petroleum resin and copolymerized petroleum resin, with the weight percentage of each substance in the mixed resin being 85% C9 petroleum resin and 15% copolymerized petroleum resin. The additives are composed of sulfur and Sasobit warm mix agent, with the weight percentage of each substance in the additive being 30% sulfur and 70% Sasobit warm mix agent. The base asphalt is No. 70 base asphalt, and the polymer modifier is an industrial 791 linear SBS modifier.

[0121] The aggregate comprises five particle sizes, namely 13.2-16 mm, 9.5-13.2 mm, 5-9.5 mm, 3-5 mm, and 0-3 mm, with the mass percentage of each particle size in the aggregate being 9 wt% for 13.2-16 mm, 23 wt% for 9.5-13.2 mm, 19 wt% for 5-9.5 mm, 23 wt% for 3-5 mm, and 26 wt% for 0-3 mm. The mixed mineral powder comprises phosphogypsum powder and calcium carbonate powder, with the mass percentage of each substance in the mixed mineral powder being 40 wt% for phosphogypsum powder and 60 wt% for calcium carbonate powder.

[0122] In step 1, the method for preparing bio-asphalt comprises the following steps in order:

[0123] Step (1): weighing base asphalt, restaurant waste oil, mixed rubber powder, polymer modifier, mixed resin, and additives according to the designed material ratio;

[0124] Step (2): pre-treating the restaurant waste oil. The pre-treatment process is as follows: first, placing the restaurant waste oil, bamboo charcoal, and activated carbon into a stirring container, wherein the amount of bamboo charcoal and activated carbon added is 15% of the total amount of the restaurant waste oil; then placing the stirring container into an oil bath pot of a high-speed stirring disperser, stirring while heating at a stirring speed of 1500 r / min, and continuing to stir for 1.5 hours after heating to 160° C.; finally, cooling after the stirring is completed, and filtering out the bamboo charcoal and activated carbon, thereby completing the pre-treatment of the restaurant waste oil;

[0125] Step (3): placing the matrix asphalt in an oven and heating it to a fluid state at a temperature of 150° C. for 2 hours, and keeping it warm for later use after the heating is completed; placing the pretreated catering waste oil in an oven and heating it at a temperature 15° C. higher than the heating temperature of the matrix asphalt for 1.5 hours, and keeping it warm for later use after the heating is completed;

[0126] Step (4): Place all the matrix asphalt being insulated into a stirring container, then place the stirring container into an oil bath pot of a high-speed stirring disperser, and heat while stirring at a stirring speed of 1000 r / min. When the temperature is heated to a temperature 15°C higher than the heating temperature of the matrix asphalt in the oven, add the restaurant waste oil being insulated into the stirring container in an amount of 30% of the total amount of the restaurant waste oil. While maintaining the stirring speed and heating temperature unchanged, continue stirring for 10 minutes to allow the matrix asphalt and the restaurant waste oil to fuse;

[0127] Step (5): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 125-150 μm in the mixed rubber powder and the copolymerized petroleum resin in the mixed resin are placed in a stirring container and stirred continuously for 10 minutes to mix the substances;

[0128] Step (6): while maintaining the stirring speed and heating temperature unchanged, add all the polymer modifiers into the stirring container and continue stirring for 20 minutes to mix all the substances;

[0129] Step (7): while maintaining the stirring speed constant, the temperature is raised while stirring. After the temperature rises by 15° C., the cooking waste oil being kept warm is added to the stirring container in an amount of 30% of the total amount of the cooking waste oil. The stirring speed is then increased to 1500 r / min and the stirring is continued for 10 min to mix the substances.

[0130] Step (8): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 180-250 μm in the mixed rubber powder and the C9 petroleum resin in the mixed resin are placed in a stirring container and stirred continuously for 15 minutes to mix the substances;

[0131] Step (9): While maintaining the stirring speed and heating temperature unchanged, add all the remaining catering waste oil into the stirring container and continue stirring for 10 minutes to mix the substances;

[0132] Step (10): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 150-180 μm in the mixed rubber powder is placed in a stirring container and stirred continuously for 15 minutes to mix the materials;

[0133] Step (11): while maintaining the stirring speed and heating temperature unchanged, add all the additives into the stirring container and continue stirring for 10 minutes to mix all the substances;

[0134] Step (12): placing the stirring container containing the substances into a high-speed shearing machine, first heating it to a temperature 5°C higher than the temperature of the substances in the high-speed stirring disperser, and then shearing and stirring it at a shear stirring speed of 5500 r / min and a shear stirring time of 45 min;

[0135] Step (13): Place the stirring container containing the substances into a high-speed stirring disperser, heat it to a temperature 15°C lower than the temperature of the substances in the high-speed shearing machine, and then stir it at a stirring speed of 800 r / min for 1 hour;

[0136] Step (14): The stirring container containing the substances is taken out from the high-speed stirring disperser and cooled to room temperature by autogenous heating to obtain bio-asphalt.

[0137] In step 2, the heating temperature for aggregates of all particle sizes and the mixed mineral powder was 180°C for 2.5 hours. The heating temperature for the bio-asphalt was 5°C lower than that for all particle sizes and the mixed mineral powder, and the heating time was 2.5 hours. In step 3, the mixing speed for all particle sizes and the bio-asphalt was 500 r / min for 45 seconds. In step 4, after adding the mixed mineral powder and lignin fiber, the mixing speed for all materials was increased to 500 r / min for 45 seconds.

[0138] Comparative Example 1:

[0139] The three aforementioned examples used a layer-by-layer approach to prepare bio-asphalt. The timing for adding waste cooking oil and rubber powder was specified: waste cooking oil was added at three different time points, and rubber powder of three different particle sizes was added at three different time points. The waste cooking oil and rubber powder of three different particle sizes were added alternately. The bio-asphalt prepared using this layer-by-layer approach was further used to prepare asphalt mixtures.

[0140] The selection and proportion of the various substances in the asphalt mixture of Comparative Example 1 are the same as those in Example 1, the selection and proportion of the various substances in the bio-asphalt are also the same as those in Example 1, and the preparation method and process parameters of the asphalt mixture are also the same as those in Example 1. The difference is that the preparation method of bio-asphalt does not adopt a layer-by-layer progressive approach, but instead adds all the catering waste oil and all the rubber powder at a certain point in time.

[0141] The preparation process of bio-asphalt in comparative example 1 includes the following steps in order: pre-treating the catering waste oil, and the pre-treatment process is the same as that in Example 1; placing the matrix asphalt and the pre-treated catering waste oil in an oven for heating, and the heating process is the same as that in Example 1; placing all the matrix asphalt and all the catering waste oil in a stirring container, and then placing the stirring container in an oil bath pot of a high-speed stirring disperser for stirring, the stirring temperature is 12°C higher than the heating temperature of the matrix asphalt in the oven, the stirring speed is 900r / min, and the stirring time is 12min; adding all the polymer modifiers into the stirring container for stirring, and the stirring temperature and stirring The stirring speed was kept constant for 20 minutes; all the mixed resins were added to the stirring vessel, the stirring temperature and stirring speed were kept constant, and the stirring time was 15 minutes; all the rubber powders of the three particle sizes were added to the stirring vessel, the stirring temperature and stirring speed were kept constant, and the stirring time was 15 minutes; all the additives were added to the stirring vessel, the stirring temperature and stirring speed were kept constant, and the stirring time was 10 minutes; the stirring vessel containing all the substances was placed in a high-speed shearing machine for shear stirring, the shear stirring parameters were the same as those in Example 1; the stirring vessel containing all the substances was then placed in a high-speed stirring disperser for stirring, the stirring parameters were the same as those in Example 1. The bioasphalt prepared in Comparative Example 1 was further used to prepare an asphalt mixture.

[0142] Comparative Example 2:

[0143] The three aforementioned examples used a layer-by-layer approach to prepare bio-asphalt. The timing for adding waste cooking oil and rubber powder was specified: waste cooking oil was added at three different time points, and rubber powder of three different particle sizes was added at three different time points. The waste cooking oil and rubber powder of three different particle sizes were added alternately. The bio-asphalt prepared using this layer-by-layer approach was further used to prepare asphalt mixtures.

[0144] The selection and proportion of the various substances in the asphalt mixture of Comparative Example 2 are the same as those in Example 1, the selection and proportion of the various substances in the bio-asphalt are also the same as those in Example 1, and the preparation method and process parameters of the asphalt mixture are also the same as those in Example 1. The difference is that the preparation method of bio-asphalt does not adopt a layer-by-layer progressive approach, but instead adds all the catering waste oil and all the rubber powder at a certain point in time.

[0145] The preparation process of bio-asphalt in comparative example 2 includes the following steps in order: pre-treating the catering waste oil, and the pre-treatment process is the same as that in Example 1; placing the matrix asphalt and the pre-treated catering waste oil in an oven for heating respectively, and the heating process is the same as that in Example 1; placing all the matrix asphalt and all the catering waste oil in a stirring container, and then placing the stirring container in an oil bath pot of a high-speed stirring disperser for stirring, the stirring temperature is 12°C higher than the heating temperature of the matrix asphalt in the oven, the stirring speed is 900r / min, and the stirring time is 12min; the rubber powder of the third gear particle size is fully The first step is to add all the materials into the stirring vessel, keep the stirring temperature and stirring speed constant, and stir for 15 minutes; add all the polymer modifiers and all the mixed resins into the stirring vessel, keep the stirring temperature and stirring speed constant, and stir for 20 minutes; add all the additives into the stirring vessel, keep the stirring temperature and stirring speed constant, and stir for 10 minutes; place the stirring vessel containing all the materials into a high-speed shearing machine for shear stirring, using the same shear stirring parameters as in Example 1; and place the stirring vessel containing all the materials into a high-speed stirring disperser for stirring, using the same stirring parameters as in Example 1. The bio-asphalt prepared in Comparative Example 2 is further used to prepare an asphalt mixture.

[0146] In the above two comparative examples, the preparation process of bio-asphalt adopts the method of adding all the catering waste oil and all the mixed rubber powder at one time, and the mixing effect is as follows: Figure 15 As shown, (a) is a photo of the effect of adding all the mixed rubber powder at one time, and (b) is a photo of the effect of adding all the catering waste oil at one time. If all the rubber powder is added at one time, since the mixture of catering waste oil and matrix asphalt is relatively thin as a whole, the rubber powder will be suspended on the surface of the mixture and aggregate at the edge of the vortex to form a flocculent mass, which is difficult to further fuse with the matrix asphalt, thereby seriously affecting the modification efficiency and the use effect of the final product; if the catering waste oil is added at one time, the rubber powder and resin cannot be fully swollen, and the insufficiently swollen body will aggregate to form a flocculent substance, thereby affecting the use effect of the finished product. Therefore, it is necessary to add catering waste oil and rubber powder in a layer-by-layer progressive manner according to the preparation method of this embodiment, and gradually fuse the components to achieve the expected technical effect.

[0147] According to relevant test standards and specifications, the needle penetration, softening point and ductility tests were conducted on the bio-asphalt prepared in the above examples and comparative examples. At the same time, the Marshall stability, dynamic stability and water-immersion Marshall residual stability tests were conducted on the asphalt mixtures prepared in the above examples and comparative examples. The test equipment, test environment, test conditions, sample shape and size were all the same. The test results are shown in Table 1. In addition, the rheological properties of Example 1 and the two comparative examples were also tested. The test results are shown in Table 1. Figure 16As shown, (a) is the rheological property test result of Example 1, (b) is the rheological property test result of Comparative Example 1, and (c) is the rheological property test result of Comparative Example 2.

[0148] Table 1 Performance test results of bio-asphalt and asphalt mixture

[0149]

[0150] The matrix asphalt, aggregate, phosphogypsum powder, calcium carbonate slag, rubber powder, lignin fiber, and industrial 791 linear SBS modifier used in the above examples and comparative examples were purchased from Beijing Municipal Road and Bridge Building Materials Group Co., Ltd., and C9 petroleum resin, copolymerized petroleum resin, sulfur, and Sasobit warm mix agent were purchased from Aladdin Reagent Co., Ltd.

[0151] Special Note: The technical solution of this invention involves numerous parameters, and the synergistic effects between these parameters must be comprehensively considered to achieve the beneficial effects and significant improvements of this invention. Furthermore, the value ranges of each parameter in the technical solution were obtained through extensive testing. The inventors have recorded extensive experimental data for each parameter and their combinations. Due to space limitations, the specific experimental data will not be disclosed here.

[0152] Those skilled in the art will readily appreciate that the composite modified restaurant waste oil bio-asphalt mixture and its preparation method of the present invention encompass any combination of the components described in the Summary and Detailed Description of the Invention and the accompanying drawings. Due to space limitations and for the sake of clarity, not all of the various solutions resulting from these combinations are described. Any modifications, equivalent substitutions, and improvements within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A composite modified restaurant waste oil bio-asphalt mixture, characterized by: The mass percentages of each substance in the asphalt mixture are as follows: 4-7wt% of bio-asphalt, 89-92wt% of aggregate, 2-3wt% of mixed mineral powder, and 0.5-1.0wt% of lignin fiber; the mass percentages of each substance in the bio-asphalt are as follows: 50-58wt% of matrix asphalt, 18-20wt% of waste cooking oil, 15-18wt% of mixed rubber powder, 2-2.5wt% of polymer modifier, 6-8wt% of mixed resin, and 1-1.5wt% of additive.

2. The composite modified waste restaurant oil bio-asphalt mixture according to claim 1, characterized in that: The mixed rubber powder is formed by mixing rubber powders of three particle sizes, which are 180-250 μm, 150-180 μm, and 125-150 μm, respectively. The mass percentage of each particle size in the mixed rubber powder is 5-10 wt% for 180-250 μm, 80-90 wt% for 150-180 μm, and 5-10 wt% for 125-150 μm.

3. The composite modified waste restaurant oil bio-asphalt mixture according to claim 2, characterized in that: The mixed resin consists of C9 petroleum resin and copolymerized petroleum resin, and the mass percentage of each substance in the mixed resin is 80-85wt% of C9 petroleum resin and 15-20wt% of copolymerized petroleum resin.

4. The composite modified waste restaurant oil bio-asphalt mixture according to claim 3, characterized in that: The auxiliary agent is composed of sulfur and Sasobit warm mix agent, and the mass percentage of each substance in the auxiliary agent is 20-30wt% of sulfur and 70-80wt% of Sasobit warm mix agent.

5. The composite modified waste restaurant oil bio-asphalt mixture according to claim 4, characterized in that: The matrix asphalt is No. 70 matrix asphalt or No. 90 matrix asphalt; the polymer modifier is industrial 791 linear SBS modifier.

6. The composite modified waste restaurant oil bio-asphalt mixture according to claim 5, characterized in that: The aggregate includes five particle sizes, namely, particle size 13.2-16mm, particle size 9.5-13.2mm, particle size 5-9.5mm, particle size 3-5mm, and particle size 0-3mm. The mass percentage of each particle size in the aggregate is: particle size 13.2-16mm accounts for 5-10wt%, particle size 9.5-13.2mm accounts for 23-27wt%, particle size 5-9.5mm accounts for 15-20wt%, particle size 3-5mm accounts for 23-27wt%, and particle size 0-3mm accounts for 25-30wt%.

7. The composite modified waste restaurant oil bio-asphalt mixture according to claim 6, characterized in that: The mixed mineral powder consists of phosphogypsum powder and calcium carbonate mineral powder, and the mass percentage of each substance in the mixed mineral powder is 30-40wt% of phosphogypsum powder and 60-70wt% of calcium carbonate mineral powder.

8. A method for preparing a composite modified restaurant waste oil bio-asphalt mixture, characterized by: The composite modified waste catering oil bio-asphalt mixture according to any one of claims 1 to 7 is used to prepare the following steps in order: Step 1: Prepare bio-asphalt according to the designed material ratio and process flow; Step 2: Place aggregates of various particle sizes, mixed mineral powder, and bio-asphalt in an oven and heat them separately. After heating, keep them warm for later use. Step 3: Preheat the mixing pot to the same temperature as the aggregate, put the bio-asphalt into the mixing pot first, then add aggregates of various particle sizes on top of the bio-asphalt, and then mix; Step 4: After the bio-asphalt is mixed with aggregates of various particle sizes, the mixed mineral powder and lignin fiber are added to the mixing pot in turn for mixing. After the mixing of all materials is completed, the composite modified catering waste oil bio-asphalt mixture can be obtained.

9. The method for preparing the composite modified waste restaurant oil bio-asphalt mixture according to claim 8, characterized in that: In step 1, the method for preparing bio-asphalt comprises the following steps in order: Step (1): weighing base asphalt, restaurant waste oil, mixed rubber powder, polymer modifier, mixed resin, and additives according to the designed material ratio; Step (2): pre-treating the restaurant waste oil. The pre-treatment process is as follows: first, placing the restaurant waste oil, bamboo charcoal, and activated carbon into a stirring container, wherein the amount of bamboo charcoal and activated carbon added is 10-15% of the total amount of the restaurant waste oil; then placing the stirring container into an oil bath pot of a high-speed stirring disperser, stirring while heating at a stirring speed of 1200-1500 r / min, and continuing to stir for 1.5-2 hours after heating to 140-160° C.; finally, cooling after the stirring is completed, and filtering out the bamboo charcoal and activated carbon, thereby completing the pre-treatment of the restaurant waste oil; Step (3): Place the matrix asphalt in an oven and heat it until it becomes fluid. The heating temperature is 140-150°C and the heating time is 2-3 hours. After the heating is completed, keep it warm for later use. Put the pretreated catering waste oil into an oven and heat it at a temperature 10-15°C higher than that of the matrix asphalt for 1.5-2 hours. After the heating is completed, keep it warm for later use. Step (4): Place all the matrix asphalt being insulated into a stirring container, then place the stirring container into an oil bath pot of a high-speed stirring disperser, and heat while stirring at a stirring speed of 800-1000 r / min. When the temperature is heated to a temperature 10-15°C higher than the heating temperature of the matrix asphalt in the oven, add the restaurant waste oil being insulated into the stirring container in an amount of 20-30% of the total amount of the restaurant waste oil. While keeping the stirring speed and heating temperature unchanged, continue stirring for 10-15 minutes to allow the matrix asphalt and the restaurant waste oil to fuse; Step (5): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 125-150 μm in the mixed rubber powder and the copolymerized petroleum resin in the mixed resin are placed in a stirring container and stirred continuously for 10-15 minutes to mix the substances; Step (6): While maintaining the stirring speed and heating temperature unchanged, add all the polymer modifiers into the stirring container and continue stirring for 20-25 minutes to mix the substances; Step (7): while maintaining the stirring speed constant, the temperature is raised while stirring, and after the temperature rises by 10-15° C., the cooking waste oil being kept warm is added to the stirring container in an amount of 20-30% of the total amount of the cooking waste oil, and then the stirring speed is increased to 1200-1500 r / min, and the stirring is continued for 10-15 minutes to mix the substances; Step (8): While maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 180-250 μm in the mixed rubber powder and the C9 petroleum resin in the mixed resin are placed in a stirring container and stirred continuously for 15-25 minutes to mix the substances; Step (9): While maintaining the stirring speed and heating temperature unchanged, add all the remaining catering waste oil into the stirring container and continue stirring for 10-15 minutes to mix the substances; Step (10): while maintaining the stirring speed and heating temperature unchanged, the rubber powder with a particle size of 150-180 μm in the mixed rubber powder is placed in a stirring container and stirred continuously for 15-25 minutes to mix the materials; Step (11): while maintaining the stirring speed and heating temperature unchanged, add all the additives into the stirring container and continue stirring for 10-15 minutes to mix all the substances; Step (12): placing the stirring container containing the substances into a high-speed shearing machine, first heating it to a temperature 3-5°C higher than the temperature of the substances in the high-speed stirring disperser, and then shearing and stirring it at a shear stirring speed of 4500-5500 r / min and a shear stirring time of 45-60 min; Step (13): Place the stirring container containing each substance into a high-speed stirring disperser, first heat it to a temperature 10-15°C lower than the temperature of each substance in the high-speed shearing machine, and then stir it at a stirring speed of 600-800 r / min and a stirring time of 1-1.5 h; Step (14): Take the stirring container containing each substance out of the high-speed stirring disperser and cool it to room temperature by self-heating to obtain bio-asphalt.

10. The method for preparing the composite modified waste restaurant oil bio-asphalt mixture according to claim 9, characterized in that: In step 2, the heating temperature of the aggregates of each particle size and the mixed mineral powder is 170-180°C, and the heating time is 2.5-3 hours. The heating temperature of the bio-asphalt is 3-5°C lower than the heating temperature of the aggregates of each particle size and the mixed mineral powder, and the heating time is 2.5-3 hours. In step 3, the mixing speed of aggregates of various particle sizes and bio-asphalt is 400-500 r / min, and the mixing time is 45-60 s; In step 4, after adding the mixed mineral powder and lignin fiber, the mixing speed of each material is 400-500 r / min and the mixing time is 45-60 s.

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