Green renewable modified asphalt and preparation method thereof

Abstract

The invention relates to the technical field of asphalt. The invention discloses green renewable modified asphalt and a preparation method thereof. The modified asphalt is prepared from the following raw materials: matrix asphalt, vegetable oil, rubber powder, SBS (Styrene Butadiene Styrene), calcium stearoyl lactylate, glucomannan, a cross-linking agent and polyacrylic acid intercalated hydrotalcite. The preparation method comprises the following steps: S1, heating matrix asphalt, adding vegetable oil, and stirring and mixing to prepare a premix; s2, adding rubber powder into the premix, stirring and mixing, adding a cross-linking agent, stirring and mixing, adding SBS, stirring and mixing to obtain a mixture; s3, adding calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, and stirring and mixing to obtain the green renewable modified asphalt. The green renewable modified asphalt prepared in the invention can make full use of renewable resources, and has excellent pavement performance.

Description

Technical Field

[0001] The present application relates to the field of asphalt technology, and in particular to a green renewable modified asphalt and a preparation method thereof. Background Art

[0002] With the continuous improvement of global environmental protection awareness and the advancement of sustainable development strategies, the road construction industry is facing huge challenges. There are many environmental problems in the production and use of traditional asphalt road materials, such as high energy consumption, high pollution and resource consumption. Therefore, the research and development of new environmentally friendly and sustainable modified asphalt has become a top priority.

[0003] Modified asphalt is an asphalt binder made by adding admixtures (modifiers) such as rubber, resin, high molecular polymer, ground rubber powder or other fillers to the base asphalt, or by taking measures such as mild oxidation of the asphalt to improve the performance of asphalt or asphalt mixture.

[0004] Existing modified asphalt has excellent road performance, but most modifiers are still derived from petroleum products or non-renewable resources, which fails to fundamentally solve the problem of resource consumption. In addition, some high-performance modifiers are expensive, which increases the cost of road construction.

[0005] Therefore, there is an urgent need to develop a green, renewable modified asphalt that can make full use of renewable resources, achieve “turning waste into treasure”, and at the same time have excellent pavement performance. Summary of the invention

[0006] In order to solve at least one of the above technical problems and develop a green renewable modified asphalt that can fully utilize renewable resources and has excellent pavement performance, the present application provides a green renewable modified asphalt and a preparation method thereof.

[0007] On the one hand, the present application provides a green renewable modified asphalt, whose raw material composition includes, by weight: 80-100 parts of base asphalt, 5-10 parts of vegetable oil, 5-15 parts of rubber powder, 5-15 parts of SBS, 0.5-2 parts of calcium stearoyl lactylate, 0.5-2 parts of glucomannan, 0.5-2 parts of cross-linking agent, and 1-5 parts of polyacrylic acid intercalated hydrotalcite.

[0008] By adopting the above technical solution, the green renewable modified asphalt prepared by the application using specific raw materials and proportions can make full use of renewable resources, realize "turning waste into treasure", and have excellent pavement performance. The application reduces dependence on non-renewable resources by using renewable or recycled materials, such as vegetable oil and rubber powder, to achieve green and sustainable goals, and can also improve the flexibility and durability of asphalt.

[0009] The present application adds calcium stearoyl lactylate and glucomannan, which can improve the stability and weather resistance of asphalt; and adds polyacrylic acid intercalated hydrotalcite, which can improve the stability and mechanical properties of asphalt.

[0010] Optionally, the raw material composition includes, by weight: 85-95 parts of base asphalt, 6-9 parts of vegetable oil, 7-13 parts of rubber powder, 7-13 parts of SBS, 1-1.5 parts of calcium stearoyl lactylate, 1-1.5 parts of glucomannan, 1-1.5 parts of cross-linking agent, and 2-4 parts of polyacrylic acid intercalated hydrotalcite.

[0011] Optionally, the raw material composition includes, by weight: 90 parts of base asphalt, 7.5 parts of vegetable oil, 10 parts of rubber powder, 10 parts of SBS, 1.2 parts of calcium stearoyl lactylate, 1.2 parts of glucomannan, 1.2 parts of cross-linking agent, and 3 parts of polyacrylic acid intercalated hydrotalcite.

[0012] Optionally, the needle penetration of the base asphalt is 100 to 140 1 / 10 mm.

[0013] By adopting the above technical solution, the penetration of the base asphalt of the present application can not only meet the fluidity requirements during construction, but also ensure stability and durability during use. Within this penetration range, the asphalt has good flexibility, which can improve the crack resistance of the modified asphalt under low temperature conditions and reduce road cracking caused by temperature changes.

[0014] Optionally, the vegetable oil is selected from at least one of soybean oil, rapeseed oil and linseed oil.

[0015] By adopting the above technical solution, the vegetable oil selected in this application is derived from renewable crops. Compared with traditional modifiers, the use of vegetable oil reduces dependence on limited fossil resources and promotes sustainable utilization of resources. Vegetable oil can increase the flexibility of asphalt, improve its crack resistance, and extend the service life of the road. Moreover, compared with some high-performance synthetic modifiers, the cost of vegetable oil is usually lower, which helps to reduce the overall cost of modified asphalt and improve economic benefits.

[0016] Optionally, the average particle size of the rubber powder is 10 to 100 μm.

[0017] By adopting the above technical solution, the average particle size of the rubber powder of the present application can make the rubber powder more evenly dispersed in the asphalt, forming a denser rubber network, which helps to improve the elasticity and durability of the modified asphalt.

[0018] Optionally, the weight ratio of calcium stearoyl lactylate to glucomannan is 1:0.8-1.2.

[0019] By adopting the above technical scheme, the calcium stearoyl lactylate and glucomannan of the present application work together to improve the rheological properties of the modified asphalt, so that it has good fluidity at the construction temperature, and can also maintain the stability and long-term performance of the modified asphalt.

[0020] Optionally, the cross-linking agent is selected from at least one of isocyanate, phenolic resin and epoxy resin.

[0021] By adopting the above technical scheme, the cross-linking agent of the present application can improve the basic properties of modified asphalt, such as stability, durability and mechanical strength, and can also enhance its resistance to specific environmental factors, thereby improving the efficiency and cost-effectiveness of road construction and maintenance.

[0022] Optionally, the preparation method of the polyacrylic acid intercalated hydrotalcite is: Step 1: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 2 to 3:1; Step 2: adding a sodium hydroxide solution dropwise to the mixed salt solution, stirring to generate a precipitate, separating, washing, and drying to obtain a basic hydrotalcite; Step 3: ultrasonically dispersing the basic hydrotalcite in water to obtain a hydrotalcite suspension; Step 4: adding polyacrylic acid to the hydrotalcite suspension, adding potassium persulfate, stirring, separating, washing, and drying to obtain polyacrylic acid intercalated hydrotalcite.

[0023] In a second aspect, the present application provides a method for preparing the above-mentioned green renewable modified asphalt, comprising the following steps: S1. heating the base asphalt to 160° C. to 180° C., adding the vegetable oil, stirring and mixing, and preparing a premix; S2, adding rubber powder to the premix, stirring and mixing, adding the crosslinking agent, stirring and mixing, adding the SBS, stirring and mixing, and obtaining a mixture; S3. Adding calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, stirring and mixing, and obtaining green renewable modified asphalt.

[0024] By adopting the above technical scheme, the preparation method adopted in this application has a simple process and high production efficiency. The raw materials have good compatibility and dispersibility, which further optimizes the flexibility and stability of the modified asphalt, extends the service life of the road, and reduces maintenance costs. The green renewable modified asphalt preparation method of this application, through the rational use of renewable and recycled materials, not only improves the comprehensive performance of asphalt, but also embodies the concept of sustainable development.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects: 1. This application adopts specific raw materials and proportions to produce green renewable modified asphalt that can make full use of renewable resources, realize "turning waste into treasure", and at the same time has excellent pavement performance.

[0026] 2. This application achieves green and sustainable goals by using renewable or recycled materials, such as vegetable oil and rubber powder, to reduce dependence on non-renewable resources.

[0027] 3. The preparation method adopted in this application has a simple process and high production efficiency. The raw materials have good compatibility and dispersibility, which further optimizes the flexibility and stability of the modified asphalt, prolongs the service life of the road, and reduces maintenance costs. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with embodiments.

[0029] The present application designs a green renewable modified asphalt, and its raw material composition includes, by weight: 80-100 parts of base asphalt, 5-10 parts of vegetable oil, 5-15 parts of rubber powder, 5-15 parts of SBS, 0.5-2 parts of calcium stearoyl lactylate, 0.5-2 parts of glucomannan, 0.5-2 parts of cross-linking agent, and 1-5 parts of polyacrylic acid intercalated hydrotalcite.

[0030] The green renewable modified asphalt of the present application is prepared by the following method, comprising the following steps: S1. heating the base asphalt to 160° C. to 180° C., adding the vegetable oil, stirring and mixing, and preparing a premix; S2, adding rubber powder to the premix, stirring and mixing, adding the crosslinking agent, stirring and mixing, adding the SBS, stirring and mixing, and obtaining a mixture; S3. Adding calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, stirring and mixing, and obtaining green renewable modified asphalt.

[0031] The applicant has designed the technical solution of the present application because the modifiers of existing modified asphalt are derived from petroleum products or non-renewable resources and fail to fundamentally solve the problem of resource consumption.

[0032] The raw materials used in this application are as follows: Soybean oil: CAS: 8001-22-7.

[0033] Linseed oil: CAS: 8001-26-1.

[0034] SBS:CAS:9003-55-8.

[0035] Calcium stearoyl lactylate: CAS: 5793-94-2.

[0036] Glucomannan: CAS: 11078-31-2.

[0037] Isocyanate: CAS: 75-13-8.

[0038] Phenolic resin: CAS: 9003-35-4.

[0039] Mg(NO3)2·6H2O (magnesium nitrate hexahydrate): CAS: 13446-18-9.

[0040] Al(NO3)3·9H2O (aluminum nitrate nonahydrate): CAS: 7784-27-2.

[0041] Polyacrylic acid: CAS: 9003-01-4.

[0042] Potassium persulfate: CAS: 7727-21-1. Specific embodiments

[0043] The preparation method of the polyacrylic acid intercalated hydrotalcite used in Examples 1 to 5 is: Step 1: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 3:1; Step 2: adding a sodium hydroxide solution with a mass fraction of 5% dropwise into the mixed salt solution, stirring to generate a precipitate, separating, washing, and drying to obtain a basic hydrotalcite; Step 3: ultrasonically dispersing the basic hydrotalcite in water to obtain a hydrotalcite suspension; Step 4: adding polyacrylic acid to the hydrotalcite suspension, adding potassium persulfate, stirring at 70° C. for 7 hours, separating, washing, and drying to obtain polyacrylic acid intercalated hydrotalcite.

[0044] Embodiments 1 to 5 Example 1 This embodiment provides a green renewable modified asphalt, and its raw material composition includes, by weight: 100 parts of base asphalt, 5 parts of vegetable oil, 15 parts of rubber powder, 5 parts of SBS, 0.5 parts of calcium stearoyl lactylate, 0.5 parts of glucomannan, 0.5 parts of cross-linking agent, and 1 part of polyacrylic acid intercalated hydrotalcite; Among them, the needle penetration of the base asphalt is 120 1 / 10mm; the vegetable oil is soybean oil; the average particle size of the rubber powder is 55μm; and the cross-linking agent is isocyanate.

[0045] The preparation method comprises the following steps: S1. Heat the base asphalt to 160° C., add vegetable oil, stir and mix to prepare a premix; S2, adding rubber powder to the premix, stirring and mixing, adding a cross-linking agent, stirring and mixing, adding the SBS, stirring and mixing, and obtaining a mixture; S3. Add calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, stir and mix, and obtain green renewable modified asphalt.

[0046] Example 2 This embodiment provides a green renewable modified asphalt, and its raw material composition includes, by weight: 85 parts of base asphalt, 9 parts of vegetable oil, 7 parts of rubber powder, 13 parts of SBS, 1 part of calcium stearoyl lactylate, 1 part of glucomannan, 1.5 parts of cross-linking agent, and 4 parts of polyacrylic acid intercalated hydrotalcite; Among them, the needle penetration of the base asphalt is 120 1 / 10mm; the vegetable oil is soybean oil; the average particle size of the rubber powder is 55μm; and the cross-linking agent is isocyanate.

[0047] The preparation method comprises the following steps: S1. Heat the base asphalt to 165° C., add vegetable oil, stir and mix, and prepare a premix; S2, adding rubber powder to the premix, stirring and mixing, adding a cross-linking agent, stirring and mixing, adding the SBS, stirring and mixing, and obtaining a mixture; S3. Add calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, stir and mix, and obtain green renewable modified asphalt.

[0048] Example 3 This embodiment provides a green renewable modified asphalt, and its raw material composition includes, by weight: 90 parts of base asphalt, 7.5 parts of vegetable oil, 10 parts of rubber powder, 10 parts of SBS, 1.2 parts of calcium stearoyl lactylate, 1.2 parts of glucomannan, 1.2 parts of cross-linking agent, and 3 parts of polyacrylic acid intercalated hydrotalcite; Among them, the needle penetration of the base asphalt is 120 1 / 10mm; the vegetable oil is soybean oil; the average particle size of the rubber powder is 55μm; and the cross-linking agent is isocyanate.

[0049] The preparation method comprises the following steps: S1. Heat the base asphalt to 170° C., add vegetable oil, stir and mix to prepare a premix; S2, adding rubber powder to the premix, stirring and mixing, adding a cross-linking agent, stirring and mixing, adding the SBS, stirring and mixing, and obtaining a mixture; S3. Add calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, stir and mix, and obtain green renewable modified asphalt.

[0050] Example 4 This embodiment provides a green renewable modified asphalt, and its raw material composition includes, by weight: 95 parts of base asphalt, 6 parts of vegetable oil, 13 parts of rubber powder, 7 parts of SBS, 1.5 parts of calcium stearoyl lactylate, 1.5 parts of glucomannan, 1 part of cross-linking agent, and 2 parts of polyacrylic acid intercalated hydrotalcite; Among them, the needle penetration of the base asphalt is 120 1 / 10mm; the vegetable oil is soybean oil; the average particle size of the rubber powder is 55μm; and the cross-linking agent is isocyanate.

[0051] The preparation method comprises the following steps: S1. Heat the base asphalt to 175°C, add vegetable oil, stir and mix to prepare a premix; S2, adding rubber powder to the premix, stirring and mixing, adding a cross-linking agent, stirring and mixing, adding the SBS, stirring and mixing, and obtaining a mixture; S3. Add calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, stir and mix, and obtain green renewable modified asphalt.

[0052] Example 5 This embodiment provides a green renewable modified asphalt, and its raw material composition includes, by weight: 80 parts of base asphalt, 10 parts of vegetable oil, 5 parts of rubber powder, 15 parts of SBS, 2 parts of calcium stearoyl lactylate, 2 parts of glucomannan, 2 parts of cross-linking agent, and 5 parts of polyacrylic acid intercalated hydrotalcite; Among them, the needle penetration of the base asphalt is 120 1 / 10mm; the vegetable oil is soybean oil; the average particle size of the rubber powder is 55μm; and the cross-linking agent is isocyanate.

[0053] The preparation method comprises the following steps: S1. Heat the base asphalt to 180°C, add vegetable oil, stir and mix to prepare a premix; S2, adding rubber powder to the premix, stirring and mixing, adding a cross-linking agent, stirring and mixing, adding the SBS, stirring and mixing, and obtaining a mixture; S3. Add calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, stir and mix, and obtain green renewable modified asphalt.

[0054] Comparative Examples 1 to 5 Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite are not added in Comparative Example 1.

[0055] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that calcium stearoyl lactylate and glucomannan are not added in Comparative Example 2.

[0056] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that calcium stearoyl lactylate is not added in Comparative Example 3.

[0057] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that no glucomannan is added in Comparative Example 4.

[0058] Comparative Example 5 The difference between Comparative Example 5 and Example 3 is that the preparation method of Comparative Example 5 is: S1. Heat the base asphalt to 170° C., add vegetable oil, stir and mix to prepare a premix; S2. Add rubber powder, SBS, calcium stearoyl lactylate, glucomannan, a cross-linking agent and polyacrylic acid intercalated hydrotalcite into the premix, stir and mix, and obtain green renewable modified asphalt.

[0059] Experimental testing Test items and test methods Flexibility: Determine the ductility of green renewable modified asphalt according to T0605-2011 in JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering"; Stability: The softening point of green renewable modified asphalt is determined according to T0606-2011 in JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering"; Marshall stability is determined according to T0709-2011.

[0060] The green renewable modified asphalt prepared in Examples 1 to 5 and Comparative Examples 1 to 5 was tested for ductility, softening point and Marshall stability. The test results are shown in Table 1.

[0061] Table 1 From the test results in Table 1, it can be seen that the green renewable modified asphalt prepared in Examples 1 to 5 has high ductility, good flexibility, high softening point, high Marshall stability, good durability, and excellent pavement performance.

[0062] Comparative Example 1 did not add calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite, Comparative Example 2 did not add calcium stearoyl lactylate and glucomannan, Comparative Example 3 did not add calcium stearoyl lactylate, and Comparative Example 4 did not add glucomannan. The flexibility and stability of the green renewable modified asphalts prepared in Comparative Examples 1 to 4 were significantly reduced.

[0063] In step S2 of comparative example 5, the raw materials are mixed and stirred together without being added step by step, and the flexibility and stability of the green renewable modified asphalt obtained are reduced.

[0064] Embodiments 6 to 11 Example 6 The difference between Example 6 and Example 3 is that in Example 6, the average particle size of the rubber powder is 10 μm.

[0065] Example 7 The difference between Example 7 and Example 3 is that in Example 7, the average particle size of the rubber powder is 100 μm.

[0066] Example 8 The difference between Example 8 and Example 3 is that in Example 8, the vegetable oil is linseed oil.

[0067] Example 9 The difference between Example 9 and Example 3 is that in Example 9, the cross-linking agent is phenolic resin.

[0068] Example 10 The difference between Example 10 and Example 3 is that in Example 10, the total weight of calcium stearoyl lactylate and glucomannan remains unchanged, and the weight ratio of calcium stearoyl lactylate to glucomannan is 1:0.8.

[0069] Embodiment 11 The difference between Example 11 and Example 3 is that in Example 11, the total weight of calcium stearoyl lactylate and glucomannan remains unchanged, and the weight ratio of calcium stearoyl lactylate to glucomannan is 1:1.2.

[0070] The green renewable modified asphalt prepared in Examples 6 to 11 was tested for ductility, softening point and Marshall stability. The test results are shown in Table 2.

[0071] Table 2 From the test results in Table 2, it can be seen that the difference between Example 6 and Example 7 and Example 3 is that the average particle size of the rubber powder is different, among which the green renewable modified asphalt prepared in Example 3 has the best flexibility and stability.

[0072] The flexibility and stability of the green renewable modified asphalt prepared in Examples 8 to 9 are similar to those in Example 3.

[0073] The difference between Example 10 and Example 11 and Example 3 is that the weight ratios of calcium stearoyl lactylate and glucomannan are different, and the green renewable modified asphalt prepared in Example 3 has the best flexibility and stability.

[0074] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A green renewable modified asphalt, characterized in that: The raw material composition includes, by weight: 80-100 parts of base asphalt, 5-10 parts of vegetable oil, 5-15 parts of rubber powder, 5-15 parts of SBS, 0.5-2 parts of calcium stearoyl lactylate, 0.5-2 parts of glucomannan, 0.5-2 parts of cross-linking agent, and 1-5 parts of polyacrylic acid intercalated hydrotalcite.

2. The green renewable modified asphalt according to claim 1, characterized in that: The raw material composition includes, by weight: 85-95 parts of base asphalt, 6-9 parts of vegetable oil, 7-13 parts of rubber powder, 7-13 parts of SBS, 1-1.5 parts of calcium stearoyl lactylate, 1-1.5 parts of glucomannan, 1-1.5 parts of cross-linking agent, and 2-4 parts of polyacrylic acid intercalated hydrotalcite.

3. The green renewable modified asphalt according to claim 1, characterized in that: The raw material composition includes, by weight: 90 parts of base asphalt, 7.5 parts of vegetable oil, 10 parts of rubber powder, 10 parts of SBS, 1.2 parts of calcium stearoyl lactylate, 1.2 parts of glucomannan, 1.2 parts of cross-linking agent, and 3 parts of polyacrylic acid intercalated hydrotalcite.

4. The green renewable modified asphalt according to claim 1, characterized in that: The needle penetration of the matrix asphalt is 100~140 1 / 10mm.

5. The green renewable modified asphalt according to claim 1, characterized in that: The vegetable oil is selected from at least one of soybean oil, rapeseed oil and linseed oil.

6. The green renewable modified asphalt according to claim 1, characterized in that: The average particle size of the rubber powder is 10-100 μm.

7. The green renewable modified asphalt according to claim 1, characterized in that: The weight ratio of the calcium stearoyl lactylate to glucomannan is 1:0.8-1.

2.

8. The green renewable modified asphalt according to claim 1, characterized in that: The cross-linking agent is selected from at least one of isocyanate, phenolic resin and epoxy resin.

9. The green renewable modified asphalt according to claim 1, characterized in that: The preparation method of the polyacrylic acid intercalated hydrotalcite is: Step 1: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 2~3:1; Step 2: adding a sodium hydroxide solution dropwise to the mixed salt solution, stirring to generate a precipitate, separating, washing, and drying to obtain a basic hydrotalcite; Step 3: ultrasonically dispersing the basic hydrotalcite in water to obtain a hydrotalcite suspension; Step 4: adding polyacrylic acid to the hydrotalcite suspension, adding potassium persulfate, stirring, separating, washing, and drying to obtain polyacrylic acid intercalated hydrotalcite.

10. A method for preparing the green renewable modified asphalt according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, heating the base asphalt to 160°C-180°C, adding the vegetable oil, stirring and mixing, to prepare a premix; S2, adding rubber powder to the premix, stirring and mixing, adding the crosslinking agent, stirring and mixing, adding the SBS, stirring and mixing, and obtaining a mixture; S3. Adding calcium stearoyl lactylate, glucomannan and polyacrylic acid intercalated hydrotalcite into the mixture, stirring and mixing, and obtaining green renewable modified asphalt.

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