Method for preparing asphalt mixture from chemically modified retired wind turbine blade materials

Abstract

The invention discloses a method for preparing asphalt mixture by using chemically modified retired wind turbine blade materials. Firstly, the crushed retired wind turbine blades are modified by a chemical modifier to obtain modified retired wind turbine blade materials; the modified retired wind turbine blade materials are compounded with asphalt mixture to obtain modified asphalt mixture, which can be directly used for highway construction. Through the compounding of the modified retired wind turbine blade materials and asphalt mixture, the invention realizes the recycling and reuse of retired wind turbine blades, and the obtained modified asphalt mixture has properties such as high immersion Marshall residual stability, freeze-thaw splitting test residual strength ratio and dynamic stability. The retired wind turbine blades of the invention have low treatment cost and high added value, and all technical indexes of the modified asphalt mixture meet the standards.

Description

Technical Field

[0001] The present invention relates to a method for preparing asphalt mixture from chemically modified retired wind turbine blade materials, belonging to the technical field of solid waste resource utilization. Background Art

[0002] At present, the main treatment methods for retired wind turbine blades are landfill treatment, co-processing in cement kilns, pyrolysis treatment, chemical decomposition treatment, etc. However, landfill treatment not only occupies a large amount of land but also causes waste of retired wind turbine blade resources; co-processing in cement kilns will have a certain impact on the quality of cement; pyrolysis treatment has high energy consumption and high treatment costs, and is prone to generating environmental pollutants; chemical decomposition treatment has high costs and will cause environmental pollution. Therefore, finding a more efficient and convenient way to recycle and reuse retired wind turbine blades remains a difficult problem.

[0003] The main material of the wind turbine blade in a wind power generation unit is a polymer matrix composite material (commonly known as fiberglass), and its specific composition is epoxy resin reinforced with glass fibers, which has the advantages of light weight, high strength, corrosion resistance, and designable properties. Therefore, according to the current situation in China's road and bridge construction that urgently needs modified materials with high strength, low price, large supply, and stable supply, by taking advantage of the light weight, high strength, large quantity, and corrosion resistance of retired wind turbine blades, the materials of retired wind turbine blades are modified through chemical treatment methods, and the modified retired wind turbine blade materials are compounded with asphalt mixtures used in road and bridge construction to prepare new modified asphalt mixtures. This not only realizes the resource-based, high-value, and green recycling and reuse of retired wind turbine blades, but also can improve the strength of road and bridge construction materials and reduce the cost of road and bridge construction, which has important significance. Summary of the Invention

[0004] According to the material characteristics of retired wind turbine blades, the present invention provides a method for preparing asphalt mixture from chemically modified retired wind turbine blade materials, which realizes the resource-based, high-value, and green utilization of retired wind turbine blades while improving the strength of road and bridge construction materials and reducing the cost of road and bridge construction.

[0005] The method for preparing asphalt mixture by using chemically modified retired wind turbine blade materials of the present invention includes the following steps:

[0006] (1) Chemical modification of retired wind turbine blade materials: Add a chemical modifier to deionized water and heat it to completely dissolve, then add retired wind turbine blade materials, react at 20 - 200 °C for 1 - 10 h, and dry at 20 - 300 °C to obtain modified retired wind turbine blade materials for standby.

[0007] In step (1), the retired wind turbine blade materials are first crushed, and the length of the crushed retired wind turbine blade materials is between 0.01 - 10 mm, and the diameter is between 0.01 - 10 mm.

[0008] The chemical modifier is at least one of N-vinylamide polymers, polyhydric alcohols, and fatty acid esters. Specifically, it is at least one of N-vinylacetamide, polyvinylpyrrolidone, poly(N-vinylphthalimide), diethanolamide, triethanolamine, glycerol, tripolyglycerol, diethylene glycol, polyethylene glycol, polypropylene glycol, monoglyceryl fatty acid ester, triglyceride fatty acid ester, sorbitan oleate, and ethylene glycol distearate.

[0009] The addition amount of the chemical modifier is 0.01 - 30.0% of the weight of the retired wind turbine blade material, and the addition method is one or more times.

[0010] The addition amount of deionized water is 0.01 - 50 times the weight of the retired wind turbine blade material.

[0011] (2) Preparation method of asphalt mixture: Mix aggregate, mineral powder, modified retired wind turbine blade material, and asphalt evenly at 20 - 180 °C to obtain modified asphalt mixture.

[0012] In step (2), the weight percentages of each component are: the modified retired wind turbine blade material is 0.01 - 30.0%, the mineral powder is 0.01 - 30.0%, the aggregate is 20.0 - 99.88%, and the asphalt is 0.1 - 20.0%.

[0013] The aggregate is diabase, and the particle size range of the used aggregate is between 0.01 - 15 mm.

[0014] The mineral powder is calcium carbonate, and the particle size < 0.074 mm.

[0015] In the present invention, surface functional groups are constructed on the retired wind turbine blade material through a chemical modifier to change its surface physical and chemical properties; on this basis, the modified retired wind turbine blade material is compounded with the asphalt mixture. Since the modified retired wind turbine blade material has abundant surface functional groups, it can improve the interaction force between the wind turbine blade material and the asphalt mixture, while enhancing the mechanical properties and physical and chemical properties of the asphalt mixture, and reducing the production cost of the asphalt mixture.

[0016] The properties of the asphalt mixture prepared by using the chemically modified retired wind turbine blade material in the present invention are as follows:

[0017] Compared with the traditional asphalt mixture, the void ratio of the modified asphalt mixture is between 3.0% - 4.5%, the void in mineral aggregate ratio is between 17.2% - 17.6%, the asphalt saturation is between 75% - 80%, the Marshall stability is between 8.5 kN - 10.1 kN, the flow value does not exceed 4 mm, the residual stability of the soaked Marshall test and the residual strength ratio of the freeze-thaw splitting test are above 95%, and the dynamic stability is above 7000 times / mm. Some properties of the modified asphalt mixture are significantly better than those of the traditional asphalt mixture, providing a new way for the utilization of retired wind turbine blade materials.

[0018] In summary, the present invention has the following beneficial effects:

[0019] 1. By modifying the retired wind turbine blade material with a chemical modifier, the physical and chemical properties of the surface of the retired wind turbine blade material can be changed, and the mechanical properties and physical and chemical properties of the asphalt mixture prepared with the modified retired wind turbine blade material as the raw material can be improved;

[0020] 2. The asphalt mixture prepared with the modified retired wind turbine blade material in the present invention can meet the various indicators of the asphalt mixture. While realizing the recycling and reuse of the retired wind turbine blades, it can reduce the cost of road and bridge construction and increase the added value of the retired wind turbine blades;

[0021] 3. The asphalt mixture prepared with the modified retired wind turbine blade material in the present invention has higher properties such as the immersion Marshall residual stability, freeze-thaw splitting test residual strength ratio, and dynamic stability on the basis of meeting the various indicators of the asphalt mixture for road and bridge construction. Specific Embodiments

[0022] The following further illustrates the preparation of the asphalt mixture from the chemically modified retired wind turbine blade material involved in the present invention through specific examples, but does not limit the protection scope of the present invention.

[0023] Example 1

[0024] (1) Chemical modification of the retired wind turbine blade material: Weigh 10.0% (by mass ratio of the retired wind turbine blade material) of N-vinylacetamide and 0.5% (the same as above) of tripolypropylene glycerol and add them to 15 kg of deionized water, stir evenly, add 1 kg of the retired wind turbine blade material, react at 50 °C for 6 hours, filter, and dry at 100 °C to obtain the modified retired wind turbine blade material for standby;

[0025] (2) Preparation method of the asphalt mixture: Mix 18.5% mineral powder, 78.0% aggregate, and 0.5% of the modified retired wind turbine blade material obtained in step (1) evenly, add 3.0% asphalt, and mix evenly at 20 °C to obtain the modified asphalt mixture;

[0026] (3) Performance test of the asphalt mixture: Test the properties such as the void ratio, mineral aggregate void ratio, flow value, Marshall stability, immersion Marshall residual stability, and dynamic stability of the above-prepared modified asphalt mixture according to the asphalt mixture test method, and the results are shown in Table 1.

[0027] Example 2

[0028] (1) Chemical modification of retired wind turbine blade materials: Weigh 13.0% glycerol and 12.0% monoglyceride fatty acid ester and add them to 10 kg of deionized water. Stir evenly, add 1 kg of retired wind turbine blade materials, react at 100 °C for 7 hours, filter, and dry at 200 °C to obtain modified retired wind turbine blade materials for standby;

[0029] (2) Preparation method of asphalt mixture: Mix 15.0% mineral powder, 50.0% aggregate and 18.0% of the modified retired wind turbine blade materials obtained in step (1) evenly, add 17.0% asphalt, and mix evenly at 50 °C to obtain a modified asphalt mixture;

[0030] (3) Performance test of asphalt mixture: Test the properties of the modified asphalt mixture prepared above, such as void ratio, mineral aggregate void ratio, flow value, Marshall stability, immersion Marshall residual stability, dynamic stability, etc. according to the asphalt mixture test method. The results are shown in Table 1.

[0031] Example 3

[0032] (1) Chemical modification of retired wind turbine blade materials: Weigh 0.5% polyvinylpyrrolidone and 12.0% triglyceride fatty acid ester and add them to 30 kg of deionized water. Stir evenly, add 1 kg of retired wind turbine blade materials, react at room temperature for 10 hours, filter, and dry at 240 °C to obtain modified retired wind turbine blade materials for standby;

[0033] (2) Preparation method of asphalt mixture: Mix 3.0% mineral powder, 72.0% aggregate and 20.0% of the modified retired wind turbine blade materials obtained in step (1) evenly, add 5.0% asphalt, and mix evenly at 80 °C to obtain a modified asphalt mixture;

[0034] (3) Performance test of asphalt mixture: Test the properties of the modified asphalt mixture prepared above, such as void ratio, mineral aggregate void ratio, flow value, Marshall stability, immersion Marshall residual stability, dynamic stability, etc. according to the asphalt mixture test method. The results are shown in Table 1.

[0035] Example 4

[0036] (1) Chemical modification of retired wind turbine blade materials: Weigh 12.5% diethanolamide and 11.5% polyethylene glycol and add them to 25 kg of deionized water. Stir evenly, add 1 kg of retired wind turbine blade materials, react at 130 °C for 1 hour, filter, and dry at 300 °C to obtain modified retired wind turbine blade materials for standby;

[0037] (2) Preparation method of asphalt mixture: Mix 30.0% mineral powder, 40.0% aggregate and 10.0% of the modified retired wind turbine blade materials obtained in step (1) evenly, add 20.0% asphalt, and mix evenly at 100 °C to obtain a modified asphalt mixture;

[0038] (3)Performance testing of asphalt mixture: Test the performance of the modified asphalt mixture prepared above, such as void ratio, voids in mineral aggregate, flow value, Marshall stability, residual stability of immersed Marshall, dynamic stability, etc. according to the asphalt mixture testing method. The results are shown in Table 1.

[0039] Example 5

[0040] (1)Chemical modification of retired wind turbine blade material: Weigh 2.0% N-vinylacetamide and 0.01% Span-80 and add them to 3 kg of deionized water. Stir evenly, add 1 kg of retired wind turbine blade material, and react at 60 °C for 8 hours. Filter and dry at 150 °C to obtain the modified retired wind turbine blade material for standby.

[0041] (2)Preparation method of asphalt mixture: Mix 0.01% mineral powder, 71.0% aggregate and 15.99% of the modified retired wind turbine blade material obtained in step (1) evenly, add 13.0% asphalt, and mix evenly at 120 °C to obtain the modified asphalt mixture.

[0042] (3)Performance testing of asphalt mixture: Test the performance of the modified asphalt mixture prepared above, such as void ratio, voids in mineral aggregate, flow value, Marshall stability, residual stability of immersed Marshall, dynamic stability, etc. according to the asphalt mixture testing method. The results are shown in Table 1.

[0043] Example 6

[0044] (1)Chemical modification of retired wind turbine blade material: Weigh 8.0% diethylene glycol and 1.0% poly(N-vinylphthalimide) and add them to 14 kg of deionized water. Stir evenly, add 1 kg of retired wind turbine blade material, and react at 120 °C for 3 hours. Filter and dry at 180 °C to obtain the modified retired wind turbine blade material for standby.

[0045] (2)Preparation method of asphalt mixture: Mix 4.99% mineral powder, 94.5% aggregate and 0.01% of the modified retired wind turbine blade material obtained in step (1) evenly, add 0.5% asphalt, and mix evenly at 150 °C to obtain the modified asphalt mixture.

[0046] (3)Performance testing of asphalt mixture: Test the performance of the modified asphalt mixture prepared above, such as void ratio, voids in mineral aggregate, flow value, Marshall stability, residual stability of immersed Marshall, dynamic stability, etc. according to the asphalt mixture testing method. The results are shown in Table 1.

[0047] Example 7

[0048] (1)Chemical modification of retired wind turbine blade materials: Weigh 12.0% triethanolamine and add it to 20 kg of deionized water. Stir evenly, then add 1 kg of retired wind turbine blade materials and react at 150 °C for 2 hours. Filter, and then add it to a 15.0% poly(N-vinyl phthalimide) solution (30 kg) and react at 150 °C for 2 hours. Filter and dry at 300 °C to obtain modified retired wind turbine blade materials for standby;

[0049] (2)Preparation method of asphalt mixture: Mix 7.0% mineral powder, 49.0% aggregate and 30.0% of the modified retired wind turbine blade materials obtained in step (1) evenly, add 14.0% asphalt, and mix evenly at 180 °C to obtain a modified asphalt mixture;

[0050] (3)Performance testing of asphalt mixture: Test the properties of the above-prepared modified asphalt mixture, such as void ratio, voids in mineral aggregate, flow value, Marshall stability, retained stability of soaked Marshall, dynamic stability, etc. according to the asphalt mixture testing method. The results are shown in Table 1.

[0051] Example 8

[0052] (1)Chemical modification of retired wind turbine blade materials: Weigh 21.0% polypropylene glycol, 5.0% poly(N-vinyl phthalimide) and 4.0% span-40 and add them to 5 kg of deionized water. Stir evenly, then add 1 kg of retired wind turbine blade materials and react at 200 °C for 0.1 hour. Filter and dry at 50 °C to obtain modified retired wind turbine blade materials for standby;

[0053] (2)Preparation method of asphalt mixture: Mix 20.0% mineral powder, 48.0% aggregate and 26.0% of the modified retired wind turbine blade materials obtained in step (1) evenly, add 6.0% asphalt, and mix evenly at 120 °C to obtain a modified asphalt mixture;

[0054] (3)Performance testing of asphalt mixture: Test the properties of the above-prepared modified asphalt mixture, such as void ratio, voids in mineral aggregate, flow value, Marshall stability, retained stability of soaked Marshall, dynamic stability, etc. according to the asphalt mixture testing method. The results are shown in Table 1.

[0055] Example 9

[0056] (1)Chemical modification of retired wind turbine blade materials: Weigh 5.0% diethylene glycol and 10.0% ethylene glycol distearate and add them to 25 kg of deionized water. Stir evenly, then add 1 kg of retired wind turbine blade materials and react at 160 °C for 5 hours. Filter, and then add it to a 10.0% N-vinyl acetamide solution (20 kg) and react at 160 °C for 5 hours. Filter and dry at 20 °C to obtain modified retired wind turbine blade materials for standby;

[0057] (2) Preparation method of asphalt mixture: Mix 26.0% mineral powder, 59.0% aggregate and 5.0% of the modified retired wind turbine blade material obtained in step (1) evenly, add 10.0% asphalt, and mix evenly at 90 °C to obtain the modified asphalt mixture;

[0058] (3) Performance test of asphalt mixture: Test the properties of the above-prepared modified asphalt mixture such as void ratio, voids in mineral aggregate, flow value, Marshall stability, residual stability of soaked Marshall, dynamic stability, etc. according to the asphalt mixture test method, and the results are shown in Table 1.

[0059] Example 10

[0060] (1) Chemical modification of retired wind turbine blade material: Weigh 1.0% N-vinylcaprolactam and 20.0% glycerol and add them to 5 kg of deionized water, stir evenly, add 1 kg of retired wind turbine blade material, react at 140 °C for 3 hours, filter, and then add it to an 8.0% diglycerol fatty acid ester solution (2 kg), react at 140 °C for 4 hours, filter, and dry at 100 °C to obtain the modified retired wind turbine blade material for standby;

[0061] (2) Preparation method of asphalt mixture: Mix 12.0% mineral powder, 73.0% aggregate and 0.01% of the modified retired wind turbine blade material obtained in step (1) evenly, add 14.99% asphalt, and mix evenly at 30 °C to obtain the modified asphalt mixture;

[0062] (3) Performance test of asphalt mixture: Test the properties of the above-prepared modified asphalt mixture such as void ratio, voids in mineral aggregate, flow value, Marshall stability, residual stability of soaked Marshall, dynamic stability, etc. according to the asphalt mixture test method, and the results are shown in Table 1.

[0063] Comparative Example 1

[0064] (1) Preparation method of asphalt mixture: Mix 20.0% mineral powder and 65.0% aggregate evenly, add 15.0% asphalt, and mix evenly at 140 °C to obtain the asphalt mixture;

[0065] (2) Performance test of asphalt mixture: Test the properties of the above-prepared asphalt mixture such as void ratio, voids in mineral aggregate, flow value, Marshall stability, residual stability of soaked Marshall, dynamic stability, etc. according to the asphalt mixture test method, and the results are shown in Table 1.

[0066] Comparative Example 2

[0067] (1) Preparation method of asphalt mixture: Mix 25.0% mineral powder, 60.0% aggregate and 5.0% lignin fiber evenly, add 10.0% asphalt, and mix evenly at 80 °C to obtain the asphalt mixture;

[0068] (2)Performance testing of asphalt mixture: Test the properties of the above-prepared asphalt mixture, such as void ratio, voids in mineral aggregate, flow value, Marshall stability, residual stability of immersed Marshall, dynamic stability, etc. according to the asphalt mixture testing method. The results are shown in Table 1.

[0069] Table 1 Test results of asphalt mixtures in Examples 1-10 and Comparative Examples 1-2

[0070]

Claims

1. A method for preparing asphalt mixture from chemically modified retired wind turbine blade materials, comprising the following steps: (1) Chemical modification of retired wind turbine blade materials: Add a chemical modifier to deionized water and heat it to complete dissolution, then add the retired wind turbine blade materials, react at 20~200°C for 1~10 h, and dry at 20~300°C to obtain modified retired wind turbine blade materials for standby; The length of the retired wind turbine blade materials is between 0.01~10 mm, and the diameter is between 0.01~10 mm; The chemical modifier is at least one of N-vinylacetamide, polyvinylpyrrolidone, poly(N-vinylphthalimide), diethanolamide, triethanolamine, glycerol, tripolyglycerol, diethylene glycol, polyethylene glycol, polypropylene glycol, monoglyceryl fatty acid ester, triglyceride fatty acid ester, sorbitan oleate, ethylene glycol distearate; The addition amount of the chemical modifier is 0.01~30.0% of the weight of the retired wind turbine blade materials; (2) Preparation method of asphalt mixture: Mix aggregate, mineral powder, modified retired wind turbine blade materials, and asphalt evenly at 20~180°C to obtain modified asphalt mixture; The weight percentages of each component are: modified retired wind turbine blade materials are 0.01~30.0%, mineral powder is 0.01~30.0%, aggregate is 20.0~99.88%, and asphalt is 0.1~20.0%.

2. The method for preparing asphalt mixture from the chemically modified retired fan blade material as described in claim 1, wherein: In step (1), the addition method of the chemical modifier is one or more times.

3. The method for preparing asphalt mixture from a chemically modified retired wind turbine blade material as claimed in claim 1, wherein: In step (1), the addition amount of deionized water is 0.01~50 times the weight of the retired wind turbine blade materials.

4. The method for preparing asphalt mixture from the chemically modified retired wind turbine blade material as described in claim 1, wherein: In step (2), the aggregate is diabase, and the particle size range of the used aggregate is between 0.01~15 mm.

5. The method for preparing asphalt mixture from a chemically modified retired wind turbine blade material according to claim 1, characterized in that: In step (2), the mineral powder is calcium carbonate, and the particle size is <0.074 mm.

Images