A SBS modified asphalt extender, SBS modified asphalt and a preparation method thereof

Abstract

The present application relates to the technical field of road asphalt, in particular to a ductility improver for SBS modified asphalt, SBS modified asphalt and a preparation method thereof.Compared with the prior art, the ductility improver for SBS modified asphalt comprises POE, DOA and epoxy vegetable oil, wherein the POE has weather resistance, aging resistance and toughening performance, the DOA has good aging resistance, the epoxy vegetable oil has plasticity, and the two and the DOA have good compatibility, and the SBS required in subsequent application also has good compatibility, the synergistic effect of the POE, the DOA and the epoxy vegetable oil improves the compatibility of the base asphalt and the modifier, greatly improves the storage performance and low-temperature performance of the asphalt material, and has an improvement effect on the related problems such as rutting and cracking of the asphalt pavement.

Description

Technical Field

[0001] This invention relates to the field of road asphalt technology, specifically to an elastomeric agent for SBS modified asphalt, SBS modified asphalt, and a method for preparing the same. Background Technology

[0002] Low-temperature cracking of asphalt pavement is a common pavement defect. Related studies have shown that asphalt materials contribute up to 80% to the crack resistance of asphalt pavement. Therefore, improving the low-temperature performance of asphalt materials can effectively improve the crack resistance of asphalt pavement. High-quality asphalt is one of the main means to improve the quality and performance of pavement.

[0003] Currently, styrene-butadiene-styrene block copolymer modified asphalt (SBS modified asphalt) is widely used in highways of all levels due to its excellent performance. However, existing SBS modified asphalt has poor segregation properties, which can easily lead to agglomeration and cracking when applied to road construction, thus affecting pavement quality and safety. In addition, its low-temperature performance still needs further improvement in the frigid northern regions. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide an elastomeric agent for SBS modified asphalt, SBS modified asphalt and its preparation method. The elastomeric agent for SBS modified asphalt provided by the present invention is applied in the preparation of SBS modified asphalt, and the resulting SBS modified asphalt has high storage stability and low temperature performance, and good performance and quality.

[0005] This invention provides an elastomeric agent for SBS-modified asphalt, comprising the following components in parts by weight:

[0006] 50-90 parts by weight of epoxidized vegetable oil;

[0007] 30-60 parts by weight of POE;

[0008] 1 to 5 parts by weight of dioctyl adipic acid.

[0009] Preferably, the SBS-modified asphalt ductile agent comprises the following components in parts by weight:

[0010] 60-70 parts by weight of epoxidized vegetable oil;

[0011] 30-40 parts by weight of POE;

[0012] 2-3 parts by weight of dioctyl adipic acid.

[0013] The SBS-modified asphalt ductile agent provided by this invention comprises 50-90 parts by weight of epoxidized vegetable oil, preferably 60-70 parts by weight. The epoxidized vegetable oil is selected from one or more of soybean-based epoxidized vegetable oil, linseed oil-based epoxidized vegetable oil, and castor oil-based epoxidized vegetable oil; specifically, the epoxidized vegetable oil is selected from one or more of soybean oil, linseed oil, and castor oil. The SBS-modified asphalt ductile agent provided by this invention comprises 30-60 parts by weight of POE, preferably 30-40 parts by weight. The POE is selected from Dow Chemical's POE8450 type. The SBS-modified asphalt ductile agent provided by this invention further comprises 1-5 parts by weight of dioctyl adipate (DOA), preferably 2-3 parts by weight.

[0014] In one embodiment of the present invention, the SBS-modified asphalt ductile agent comprises the following components in parts by weight: 50 parts by weight of epoxy vegetable oil; 47 parts by weight of POE; and 3 parts by weight of dioctyl adipate. In another embodiment of the present invention, the SBS-modified asphalt ductile agent comprises the following components in parts by weight: 57 parts by weight of epoxy vegetable oil; 40 parts by weight of POE; and 3 parts by weight of dioctyl adipate.

[0015] The ducting agent for SBS modified asphalt provided by this invention, namely the ducting agent for styrene-butadiene-styrene block copolymer modified asphalt, can improve the storage stability and low-temperature performance of SBS modified asphalt through the synergistic effect of epoxy vegetable oil, POE and dioctyl adipate. When used in the preparation of SBS modified asphalt, the resulting SBS modified asphalt has high storage stability and low-temperature performance, and good performance and quality.

[0016] This invention also provides a method for preparing the SBS-modified asphalt ductile agent according to any of the above-mentioned technical solutions, comprising the following steps: heating and mixing epoxy vegetable oil, POE, and dioctyl adipate to obtain the SBS-modified asphalt ductile agent. Specifically, this invention heats POE to a fluid state, then adds epoxy vegetable oil and dioctyl adipate to it and mixes to obtain the SBS-modified asphalt ductile agent. In some embodiments of this invention, POE is heated to a fluid state, then epoxy vegetable oil and dioctyl adipate are added to it sequentially and mixed, and stirred evenly to obtain the SBS-modified asphalt ductile agent.

[0017] The present invention also provides an SBS modified asphalt, which is prepared from base asphalt, SBS, a ductile agent and a stabilizer; the ductile agent is the ductile agent for SBS modified asphalt described in any of the above technical solutions or the ductile agent for SBS modified asphalt obtained by the above preparation method.

[0018] This invention also provides a method for preparing SBS-modified asphalt, comprising the following steps:

[0019] The base asphalt, SBS, stabilizer, and SBS modified asphalt described in any of the above technical solutions are subjected to shearing, swelling, and development with an elongation agent to obtain SBS modified asphalt.

[0020] or,

[0021] Epoxy vegetable oil, POE, and dioctyl adipate are heated and mixed to obtain the SBS modified asphalt ductile agent described in any of the above technical solutions; the base asphalt, SBS, stabilizer, and the SBS modified asphalt ductile agent are sheared, swollen, and developed to obtain SBS modified asphalt.

[0022] The present invention can directly use the SBS modified asphalt ductile agent described in any of the above technical solutions to prepare SBS modified asphalt, or it can first prepare the SBS modified asphalt ductile agent described in any of the above technical solutions and then use it to prepare SBS modified asphalt; the method for first preparing the SBS modified asphalt ductile agent described in any of the above technical solutions is the same as described above and will not be repeated.

[0023] The penetration of the base asphalt described in this invention is 65 dmm to 75 dmm; in one embodiment of this invention, the base asphalt is 70# base asphalt. The stabilizer described in this invention is selected from one or more of Dongying Runfeng Boyue modified asphalt stabilizer or Lianyungang Dashitong modified asphalt stabilizer; in one embodiment of this invention, the stabilizer is selected from Boyue stabilizer. Based on the mass of the base asphalt, the amount of the elastomeric agent added in this invention is 3 wt% to 5 wt%; the amount of SBS added is 4.5 wt% to 4.9 wt%; and the amount of the stabilizer added is 0.2 wt% to 0.25 wt%.

[0024] This invention involves shearing, swelling, and developing a base asphalt, SBS, a stabilizer, and a ductile agent for the SBS-modified asphalt. Specifically, the base asphalt, SBS, and the ductile agent for the SBS-modified asphalt are sheared and swollen, followed by the addition of a stabilizer for development, to obtain SBS-modified asphalt. In some embodiments of this invention, the base asphalt is heated to 130-150°C to achieve uniform flow, then SBS and the ductile agent for the SBS-modified asphalt are added and mixed, followed by shearing and swelling, and then the addition of a stabilizer for development, to obtain SBS-modified asphalt.

[0025] The mixing described in this invention is carried out at a temperature of 180-190°C, preferably 185°C. The shearing rate described in this invention is 3500-4500 rpm, preferably 4000 rpm; the shearing temperature is 185-195°C, preferably 190°C; and the shearing time is 25-35 min, preferably 30 min. The swelling time described in this invention is 45-75 min, preferably 60 min. The development temperature described in this invention is 180-185°C, and the development time is 4 h-6 h.

[0026] This invention provides a ductile agent for SBS modified asphalt, SBS modified asphalt, and a method for preparing the same. Compared with existing technologies, the ductile agent for SBS modified asphalt provided by this invention includes POE, DOA, and epoxidized vegetable oil. POE possesses weather resistance, aging resistance, and toughening properties; DOA has good anti-aging properties; and the epoxidized vegetable oil has plasticizing properties. Both POE and DOA have good compatibility with DOA, and both also have good compatibility with the SBS required for subsequent applications. The synergistic effect of POE, DOA, and epoxidized vegetable oil improves the compatibility between the base asphalt and the modifier, significantly improving the storage performance and low-temperature performance of the asphalt material, and effectively mitigating problems such as rutting and cracking in asphalt pavements. Experiments show that only when the ductile agent prepared from POE, DOA, and epoxidized vegetable oil is used in the preparation of SBS modified asphalt does the resulting SBS modified asphalt exhibit high segregation performance (i.e., good storage performance) and high low-temperature performance. Detailed Implementation

[0027] This invention discloses an elastomeric agent for SBS-modified asphalt, SBS-modified asphalt, and a method for preparing the same. Those skilled in the art can refer to this document and appropriately modify the process parameters to achieve the desired results. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The methods and applications of this invention have been described through preferred embodiments; those skilled in the art will clearly be able to modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0028] The POE used in the specific embodiments of this invention is the Dow POE8450 model.

[0029] The epoxidized vegetable oil used in the specific embodiments of the present invention is soybean oil.

[0030] The SBS used in the specific embodiments of this invention is Hainan Baling Petrochemical Modifier 791H.

[0031] The stabilizer used in the specific embodiments of the present invention is Dongying Runfeng Boyue modified asphalt stabilizer.

[0032] The present invention will be further described below with reference to the embodiments:

[0033] Example 1

[0034] 47 g of POE was heated and stirred until it reached a fluid state. Then, 50 g of epoxy vegetable oil was added and stirred for a period of time. After stirring, 3 g of DOA was added and stirred evenly to obtain ductile agent 1#. First, 550 g of 70# base asphalt was heated at 135℃ and stirred until it flowed evenly. Then, 24.75 g of modifier 791H and 17.6 g of ductile agent 1# were added and heated to 185℃ and mixed. The mixture was sheared at 4000 r / min for 30 min and swollen for 1 h. Then, 1.265 g of Boyue stabilizer was added and stirred at 185℃ for 5 h to obtain modified asphalt 1#.

[0035] Example 2

[0036] 40 g of POE was heated and stirred until it reached a fluid state. Then, 57 g of epoxy vegetable oil was added and stirred for a period of time. After stirring, 3 g of DOA was added and stirred evenly to obtain ductile agent 2#. First, 550 g of 70# base asphalt was heated at 135℃ until it flowed evenly. Then, 24.75 g of modifier 791H and 16.5 g of ductile agent 2# were added and heated to 185℃ and mixed. After shearing at 4000 r / min for 30 min and swelling for 1 h, 1.265 g of Boyue stabilizer was added and stirred at 185℃ for 5 h to obtain modified asphalt 2#.

[0037] Comparative Example 1

[0038] 57 g of epoxy vegetable oil was added to 3 g of DOA and stirred evenly to obtain ductile agent 3#. First, 550 g of 70# base asphalt was heated to 135℃ and allowed to flow evenly. Then, 24.75 g of modifier 791H and 16.5 g of ductile agent 3# were added, and the temperature was raised to 185℃ and mixed. The mixture was sheared at 4000 r / min for 30 min and swollen for 1 h. Then, 1.265 g of Boyue stabilizer was added, and the mixture was stirred at 185℃ for 5 h to obtain modified asphalt 3#.

[0039] Comparative Example 2

[0040] First, 550 g of 70# base asphalt was heated at 135℃ and allowed to flow evenly. Then, 24.75 g of modifier 791H, 6.5 g of fluid dynamic POE, and 0.5 g of DOA were added, and the mixture was heated to 185℃ and mixed. The mixture was sheared at 4000 r / min for 30 min and swollen for 1 h. Then, 1.265 g of Boyue stabilizer was added, and the mixture was stirred at 185℃ for 5 h to obtain modified asphalt #4.

[0041] The asphalt products of Examples 1 and 2 and Comparative Examples 3, 4, 5, and 6 were tested according to the following methods, and the test results are shown in Table 1. The test method for penetration is T0604-2011, the test method for ductility is T0605-2011, and the test method for softening point is T0606-2011.

[0042] Table 1

[0043]

[0044] The performance of PAV-aged asphalt products was tested using the Bending Beam Rheometer (BBR) test, and the results are shown in Table 2. Creep is a characterization of the rheological properties of polymer materials. Asphalt and asphalt mixtures exhibit obvious creep characteristics under external loads and temperatures. Low-temperature crack resistance tests were conducted on asphalt samples of different ages using the BBR tester to obtain the low-temperature creep stiffness modulus S and creep rate m of asphalt at (-12℃, -18℃). S reflects the deformation capacity of asphalt under low-temperature conditions, and m reflects the ability to dissipate load stress. Generally, S and m at 60 s are used as the basis for SHRP asphalt performance grading, where S is the stress-to-strain ratio. The smaller the S, the better the asphalt's resistance to deformation and the stronger its low-temperature crack resistance.

[0045] The flexural creep stiffness modulus S (less than 300 MPa) and creep strain rate m (greater than 0.3) of asphalt were obtained by bending beam rheometer (BBR) tests. The results showed that the creep stiffness modulus S gradually increased and the creep strain rate m gradually decreased with decreasing test temperature for different asphalt samples. This indicates that the stress relaxation ability of asphalt gradually decreases with decreasing test temperature, and the asphalt samples gradually become harder and more brittle. Asphalt materials #1 and #2 still met the requirements of S < 300 MPa and m > 0.3 at -18℃, and their low-temperature performance was better than that of asphalt materials #3 and #4.

[0046] Table 2

[0047]

[0048] In summary, this invention promotes the compatibility of the base asphalt and the modifier through the synergistic effect of epoxy vegetable oil, POE, and DOA, thereby improving the low-temperature performance of the modified asphalt and enhancing its storage stability.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A ductile agent for SBS-modified asphalt, characterized in that, It comprises the following components in parts by weight: 50-90 parts by weight of epoxidized vegetable oil; wherein the epoxidized vegetable oil is selected from one or more of soybean-based epoxidized vegetable oil, linseed oil-based epoxidized vegetable oil, and castor oil-based epoxidized vegetable oil. 30-60 parts by weight of POE; 1 to 5 parts by weight of dioctyl adipic acid.

2. The SBS-modified asphalt elastomeric agent according to claim 1, characterized in that, The POE is selected from the Dow POE8450 model.

3. An SBS-modified asphalt, characterized in that, It is prepared from base bitumen, SBS, ductile agent and stabilizer; The ducting agent is selected from any of the ducting agents for SBS modified bitumen described in claims 1 to 2.

4. A method for preparing SBS-modified asphalt, characterized in that, Includes the following steps: The base asphalt, SBS, and any of the SBS modified asphalts described in claims 1 to 2 are mixed with an elongation agent, sheared, and swollen, and a stabilizer is added to them for development, to obtain SBS modified asphalt.

5. The method for preparing SBS modified asphalt according to claim 4, characterized in that, The amount of the ductile agent added to the SBS modified bitumen is 3 wt% to 5 wt%.

6. The method for preparing SBS modified asphalt according to claim 4, characterized in that, The penetration of the base bitumen is 65 dmm to 75 dmm.

7. The method for preparing SBS modified asphalt according to claim 4, characterized in that, The stabilizer is selected from Dongying Runfeng Boyue stabilizer.

8. The method for preparing SBS modified asphalt according to claim 4, characterized in that, The shearing rate is 3500~4500 rpm, the shearing temperature is 185~195℃, and the shearing time is 25~35 min.

9. The method for preparing SBS modified asphalt according to claim 4, characterized in that, The development temperature is 180~185℃, and the development time is 4 h~6 h.

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