Composite modified hydraulic asphalt and preparation method thereof

Abstract

The invention belongs to the technical field of petrochemical engineering, and particularly relates to composite modified hydraulic asphalt and a preparation method thereof. The hydraulic asphalt is prepared from the following components in parts by mass: 100 parts of petroleum asphalt, 5 to 10 parts of SBS modifier, 15 to 25 parts of rubber modifier, 15 to 25 parts of cosolvent and 0.1 to 0.3 part of stabilizer. According to the invention, a scheme of compounding two types of modifiers, namely the rubber powder and the SBS, is adopted, the product process is simple, the structure is stable, and the composite modified hydraulic asphalt disclosed by the invention has a specific three-dimensional elastic net-shaped structure through specific stabilizer composition and a mass ratio of a styrene chain segment to a butadiene chain segment in the SBS modifier; and the adhesive can meet the requirements of special environments, and is relatively high in viscosity. The production is simple, the high-low temperature performance is excellent, the quality of the hydraulic asphalt is improved, and the application performance of the hydraulic asphalt in a special environment is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of petrochemical industry, and specifically relates to a composite modified hydraulic asphalt and a preparation method thereof. Background Art

[0002] As the power load of my country's power companies increases day by day, especially the daytime load, the peak-to-valley difference in electricity consumption is getting bigger and bigger. In order to alleviate the problem of the gap between the peak and the trough of the power system, pumped storage power stations have been created, which is an effective way to indirectly help the power grid store electricity. Hydraulic asphalt concrete is widely used in water conservancy project construction as an anti-seepage layer for hydraulic structures such as dam panels, core walls and seawalls due to its good viscoelasticity, plasticity, ductility and flexibility. At present, in the construction of water conservancy and hydropower projects, most of the 70# and 90# ordinary hydraulic asphalts are used. However, due to the changes in water levels in the application of water conservancy projects, the anti-seepage layer is alternately exposed to air and water, and is affected by factors such as ambient temperature changes, water loads and freeze-thaw fatigue, which makes it easy for ordinary hydraulic asphalt concrete to form wrinkles on the surface during service, shortening the service life of the anti-seepage layer in recent years. At the same time, with the development of pumped storage power stations in high-altitude and cold areas, the performance requirements for hydraulic asphalt materials are becoming increasingly stringent. Therefore, in order to solve the problem of hydraulic asphalt cracking at low temperatures, it is particularly important to develop low-temperature crack-resistant hydraulic asphalt suitable for use in high-altitude and cold areas.

[0003] At present, the low-temperature performance of products is mainly improved by modifying conventional hydraulic asphalt. Since rubber has good advantages such as wear resistance and toughness, adding rubber powder to asphalt can make up for the shortcomings of the base asphalt. It not only improves the heat resistance of the base asphalt and the crack resistance of asphalt concrete at low temperatures, but also solves the problem of difficult rubber handling, turning waste into treasure and actively responding to green and low-carbon. Summary of the invention

[0004] The purpose of the present invention is to provide a composite modified hydraulic asphalt and a preparation method thereof. Compared with ordinary hydraulic asphalt products, the composite modified hydraulic asphalt prepared by the present invention not only meets the requirements of high temperature performance, but also has excellent low-temperature crack resistance and adhesion. The low-temperature brittle point test temperature of the product can reach below -35°C, and the low-temperature freezing test temperature of the composite modified hydraulic asphalt concrete can reach below -45°C. At the same time, it has strong adhesion with aggregates, which meets the application of the product in special extreme environments.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions:

[0006] A composite modified hydraulic asphalt, composed of the following components in the following mass ratios:

[0007] 100 parts of petroleum asphalt,

[0008] SBS modifier 5-10 parts,

[0009] Rubber modifier 15-25 parts,

[0010] 15-25 parts of cosolvent,

[0011] Stabilizer 0.1-0.3 parts.

[0012] Furthermore, the petroleum asphalt specifically refers to Haiyun No. 70 A-grade road petroleum asphalt, with a needle penetration of 60-80, 1 / 10mm.

[0013] Furthermore, the SBS modifier is a styrene-butadiene-styrene block copolymer, wherein the mass ratio of the styrene segment to the butadiene segment is 30:70, and the weight average molecular weight is 150,000-250,000.

[0014] Furthermore, the rubber modifier is activated desulfurized micro-nano rubber particles processed from waste automobile tires, with a particle size of 30 mesh to 60 mesh.

[0015] Furthermore, the stabilizer is a rubber powder asphalt modified stabilizer, which is composed of one or more of sulfur, butyl rubber, EPDM rubber, nitrile rubber, and butadiene rubber.

[0016] Furthermore, in the composition of the stabilizer, the mass ratio of sulfur, butyl rubber, EPDM rubber, nitrile rubber and butadiene rubber is 3:1:0.5:0.2:0.5.

[0017] Furthermore, the cosolvent is an additive containing surfactant, non-rubber oil, and furfural extracted oil, and has a density of 0.95-1.05 g / cm 3 , flash point greater than 230 ℃, and the aromatic content of non-rubber oil is not less than 70%.

[0018] Furthermore, the mass ratio of the surfactant, the non-rubber oil, and the furfural extracted oil is 0.1-0.3:30-50:25-35.

[0019] A method for preparing the composite modified hydraulic asphalt described in any one of the above items comprises the following steps:

[0020] S1. Add the rubber modifier to the cosolvent and heat to 140-150°C, and stir at a constant speed of 200-300 pm for 30-40 minutes to form a uniform and viscous rubber modifier mother liquor;

[0021] S2. Heat the base asphalt in an environment of 140-150℃ until it is easy to flow, then add the SBS modifier and heat it to 175-180℃ with stirring, and stir for 20-30 minutes to allow the SBS modifier to fully swell and disperse evenly;

[0022] S3, start shearing, shearing speed 4000-5000rpm, shearing time 20-30min, shearing temperature 175~180℃, add rubber modifier mother liquor after shearing is completed and continue shearing at the same speed for 20-30min;

[0023] S4. After the shearing is completed, stabilizer is added under stirring, and stirring is carried out at 183-185℃ for 5-8h to allow each component to fully undergo crosslinking reaction under the action of the stabilizer to obtain composite modified hydraulic asphalt.

[0024] The beneficial effects of the present invention are:

[0025] (1) The present invention uses the most commonly used conventional 70# road petroleum asphalt, which has a wide range of raw material choices and a simple preparation process.

[0026] (2) The present invention adopts a compounding scheme of two types of modifiers, namely rubber powder and SBS. The product process is simple and the structure is stable. In addition, through the specific stabilizer composition and the mass ratio of the styrene segment to the butadiene segment in the SBS modifier, the composite modified hydraulic asphalt of the present invention has a specific three-dimensional elastic network structure, which can adapt to the needs of special environments and ensures strong viscosity.

[0027] (3) The composite modified hydraulic asphalt of the present invention has a softening point of above 70°C. It also has excellent low-temperature performance while ensuring high-temperature stability. The lowest asphalt brittle point test temperature can reach below -35°C.

[0028] (4) The composite modified hydraulic asphalt of the present invention adopts a compounding scheme of desulfurized micro-nano rubber particles and SBS, which improves the storage stability of the product and solves the problem of difficult handling of rubber.

[0029] (5) The composite modified hydraulic asphalt of the present invention is prepared by sequentially adding SBS modifier, rubber modifier mother liquor and stabilizer to the base asphalt, so that different modifiers are added to the base asphalt.

[0030] (5) The present invention provides a composite modified hydraulic asphalt product which is simple to produce and has excellent high and low temperature performance, thereby improving the quality of hydraulic asphalt and ensuring the application performance of hydraulic asphalt in special environments. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0032] The composite modified hydraulic asphalt provided by the present invention is made of the following components in the following mass ratios:

[0033] Petroleum asphalt: 100 parts,

[0034] SBS modifier: 5-10 parts,

[0035] Rubber modifier: 15-25 parts,

[0036] Solvent: 15-25 parts,

[0037] Stabilizer: 0.1-0.3 parts.

[0038] The petroleum asphalt here refers specifically to Haiyun No. 70 Class A road petroleum asphalt, with a needle penetration of 60~80, 1 / 10 mm.

[0039] The SBS modifier here is a styrene-butadiene-styrene block copolymer, and the linear block copolymer model is Yueyang Petrochemical YH-791, in which the mass ratio of the styrene segment to the butadiene segment is 30:70, and the weight average molecular weight is 150,000-250,000.

[0040] The rubber modifier here is activated desulfurized micro-nano rubber particles processed from waste automobile tires, with a particle size of 30 mesh to 60 mesh.

[0041] The stabilizer used here is the rubber powder asphalt modified stabilizer produced by Dongying Runfeng Boyue Petroleum Technology Co., Ltd. The main components are sulfur, butyl rubber, EPDM rubber, nitrile rubber, butadiene rubber, etc. It mainly undergoes a bonding and grafting phenomenon with the rubber powder and other polymer molecular chains and the active functional groups of asphalt, so that the rubber powder and other modifiers form a stable colloidal system with the asphalt, increase the thermal stability and toughness of the asphalt, and make the asphalt have a larger penetration ratio after hot storage, a smaller change in softening point, and a more stable performance.

[0042] The cosolvent here is provided by Dongying Mantec Petrochemical Co., Ltd., and mainly contains surfactants, non-rubber oil, and furfural extract oil additives, with a density of 0.95-1.05 g / cm 3 , flash point greater than 230 ℃, and the aromatic content of non-rubber oil is not less than 70%.

[0043] Preparation process of modified asphalt: add rubber modifier to the extender and heat to 140-150℃, stir at a constant speed of 200-300rpm for 30-40min to form a uniform and viscous rubber modifier mother liquor; heat the base asphalt in an environment of 140-150℃ to a flowable state, then add SBS modifier and stir and heat to 175-180℃, stir for 20-30min to make the SBS modifier fully swell and disperse evenly, start shearing, shear speed 4000-5000rpm, shear time 20-30min, shear temperature 175~180℃, add rubber modifier mother liquor after shearing is completed and continue to shear at the same speed for 20-30min, add 0.3% mass fraction stabilizer under stirring after shearing is completed, and stir and develop for 5-8h in an environment of 183-185℃, so that the modifier can fully undergo cross-linking reaction under the action of the stabilizer to obtain a low-temperature anti-cracking hydraulic asphalt sample with high stability.

[0044] Example 1

[0045] First, the base asphalt (Haiyun 70#) was placed in a 140℃ environment and heated until the sample was easy to flow. At the same time, 22% mass fraction of rubber modifier was added to 14% of the co-solvent and heated to 140℃. It was stirred at 200rpm for 30min to form a uniform and viscous rubber modifier mother liquor. 5% mass fraction of SBS modifier was added to the base asphalt, and the sample was heated to 175-180℃ under stirring, and then stirred and swollen at this temperature for 0.5h. After the swelling process, shearing was performed by a high-speed shearing machine, with a shearing speed of 4000rpm, a shearing time of 30min, and a shearing temperature of 175~180℃. After the shearing was completed, the rubber modifier mother liquor was added and continued to be sheared at the same speed for 30min. After the shearing was completed, 0.3% mass fraction of stabilizer was added under stirring, and stirred and developed at 183℃ for 8h to obtain a composite modified hydraulic asphalt sample.

[0046] Example 2

[0047] First, the base asphalt (Haiyun 70#) was placed in a 140℃ environment and heated until the sample was easy to flow. At the same time, 18% mass fraction of rubber modifier was added to 16% of the co-solvent and heated to 140℃. It was stirred at 200rpm for 30min to form a uniform and viscous rubber modifier mother liquor. 6% mass fraction of SBS modifier was added to the base asphalt, and the sample was heated to 175-180℃ under stirring, and then stirred and swollen at this temperature for 1h. After the swelling process, shearing was performed by a high-speed shearing machine, with a shearing speed of 4000rpm, a shearing time of 30min, and a shearing temperature of 175~180℃. After the shearing was completed, the rubber modifier mother liquor was added and continued to be sheared at the same speed for 30min. After the shearing was completed, 0.3% mass fraction of stabilizer was added under stirring, and stirred and developed at 183℃ for 8h to obtain a composite modified hydraulic asphalt sample.

[0048] Example 3

[0049] First, the matrix asphalt (Haiyun 70#) was placed in a 140°C environment and heated until the sample was easy to flow. At the same time, 16% mass fraction of rubber modifier was added to 19% of the co-solvent and heated to 140°C. It was stirred at 200rpm for 30 minutes to form a uniform and viscous rubber mother liquor. 8% mass fraction of SBS modifier was added to the matrix asphalt, and the sample was heated to 175-180°C under stirring, and then stirred and swollen at this temperature for 1h. After the swelling process, shearing was performed by a high-speed shearing machine, with a shearing speed of 4000rpm, a shearing time of 30min, and a shearing temperature of 175~180°C. After the shearing was completed, the rubber modifier mother liquor was added and continued to be sheared at the same speed for 30min. After the shearing was completed, 0.3% mass fraction of stabilizer was added under stirring, and stirred and developed at 183°C for 8h to obtain a composite modified hydraulic asphalt sample.

[0050] Example 4

[0051] First, the base asphalt (Haiyun 70#) was heated at 135°C until the sample was easy to flow. At the same time, 10% by mass of rubber modifier was added to 21% of the co-solvent and heated to 140°C. The mixture was stirred at 200 rpm for 30 minutes to form a uniform and viscous rubber modifier mother liquor. 10% by mass of SBS modifier was added to the base asphalt, and the sample was heated to 175-180°C while stirring, and then stirred and swollen at this temperature for 1 hour. After the swelling process, shearing operation was performed by a high-speed shearing machine with a shearing speed of 4000 rpm, a shearing time of 30 min, and a shearing temperature of 175-180 °C. After the shearing was completed, the rubber modifier mother liquor was added and the shearing was continued at the same speed for 30 min. After the shearing was completed, 0.3% mass fraction of stabilizer was added under stirring. In the composition of the stabilizer, the mass ratio of sulfur, butyl rubber, EPDM rubber, nitrile rubber, and butadiene rubber was 3:1:0.5:0.2:0.5. The material was stirred and developed at 183 °C for 8 h to obtain a composite modified hydraulic asphalt sample.

[0052] Test items Implementation Case 1 Implementation Case 2 Implementation Case 3 Implementation Case 4 Needle penetration, 25℃ 0.1mm 112 117 120 110 Softening point, ℃ 73 79 87 87 Elongation, 5℃, cm 69 81 ＞100 ＞100 135℃ viscosity pa ∙s 1.76 2.19 2.59 2.74 Brittle point, ℃ -36 -37 -42 -43 Segregation, ℃ 0.2 0.8 0.5 1.1 Aging ductility, 5℃, cm 36 51 73 81 Concrete freezing temperature, ℃ -40 -42 -45 -46

[0053] It can be seen from the test results in the table that the composite modified hydraulic asphalt prepared by this method has a higher softening point and better low-temperature brittle point test results, indicating that the product has excellent high and low temperature performance, can effectively prevent low-temperature freezing and high-temperature flowing phenomena, and at the same time, the material has lower viscosity and better low-temperature ductility.

[0054] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A composite modified hydraulic asphalt, characterized in that: It is composed of the following components in the following mass ratio: 100 parts of petroleum asphalt, SBS modifier 5-10 parts, Rubber modifier 15-25 parts, 15-25 parts of cosolvent, Stabilizer 0.1-0.3 parts.

2. The composite modified hydraulic asphalt according to claim 1, characterized in that: The petroleum asphalt specifically refers to Haiyun No. 70 A-grade road petroleum asphalt, with a needle penetration of 60-80, 1 / 10mm.

3. The composite modified hydraulic asphalt according to claim 1, characterized in that: The SBS modifier is a styrene-butadiene-styrene block copolymer, wherein the mass ratio of the styrene segment to the butadiene segment is 30:70, and the weight average molecular weight is 150,000-250,000.

4. The composite modified hydraulic asphalt according to claim 1, characterized in that: The rubber modifier is activated desulfurized micro-nano rubber particles processed from waste automobile tires, with a particle size of 30 mesh to 60 mesh.

5. The composite modified hydraulic asphalt according to claim 1, characterized in that: The stabilizer is a rubber powder asphalt modified stabilizer, which is composed of one or more of sulfur, butyl rubber, EPDM rubber, nitrile rubber and butadiene rubber.

6. The composite modified hydraulic asphalt according to claim 5, characterized in that: In the composition of the stabilizer, the mass ratio of sulfur, butyl rubber, EPDM rubber, nitrile rubber and butadiene rubber is 3:1:0.5:0.2:0.

5.

7. The composite modified hydraulic asphalt according to claim 1, characterized in that: The cosolvent is an additive containing surfactant, non-rubber oil, and furfural extracted oil, and has a density of 0.95-1.05 g / cm 3 , flash point greater than 230 ℃, and the aromatic content of non-rubber oil is not less than 70%.

8. The composite modified hydraulic asphalt according to claim 7, characterized in that: The mass ratio of surfactant, non-rubber oil and furfural extracted oil is 0.1-0.3:30-50:25-35.

9. A method for preparing the composite modified hydraulic asphalt according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Add the rubber modifier to the cosolvent and heat to 140-150°C, and stir at a constant speed of 200-300 pm for 30-40 minutes to form a uniform and viscous rubber modifier mother liquor; S2. Heat the base asphalt in an environment of 140-150℃ until it is easy to flow, then add the SBS modifier and heat it to 175-180℃ with stirring, and stir for 20-30 minutes to allow the SBS modifier to fully swell and disperse evenly; S3, start shearing, shearing speed 4000-5000rpm, shearing time 20-30min, shearing temperature 175~180℃, add rubber modifier mother liquor after shearing is completed and continue shearing at the same speed for 20-30min; S4. After the shearing is completed, stabilizer is added under stirring, and stirring is carried out at 183-185℃ for 5-8h to allow each component to fully undergo crosslinking reaction under the action of the stabilizer to obtain composite modified hydraulic asphalt.