High-stability rubber composite modified asphalt and preparation method thereof

Abstract

The invention belongs to the field of petrochemical engineering, and particularly relates to high-stability rubber composite modified asphalt and a preparation method thereof. The rubber composite modified asphalt provided by the invention comprises the following components in parts by mass: 100 parts of petroleum asphalt, 2-3 parts of an SBS modifier and 20-30 parts of a rubber modifier. 0.1-0.3 part of a stabilizer and 2-3 parts of a cosolvent; the petroleum asphalt is 70 # road petroleum asphalt, and the needle penetration is 60-801 / 10mm; the SBS modifier is a styrene-butadiene-styrene block copolymer, the mass ratio of a styrene chain segment to a butadiene chain segment in the block copolymer is 30: 70, and the weight-average molecular weight of the block copolymer is 150000-250000; the rubber modifier is desulfurized rubber particles, and the particle size is 30-60 meshes. The rubber composite modified asphalt provided by the invention has excellent storage stability on the basis of meeting basic index requirements of asphalt products.

Description

Technical Field

[0001] The invention belongs to the field of petrochemical industry, and in particular relates to a high-stability rubber composite modified asphalt and a preparation method thereof. Background Art

[0002] In recent years, with the vigorous development of the economy, higher requirements have been put forward for the transportation industry. The rapid economic development has brought about a rapid increase in road traffic flow, resulting in excessive loads, and the previous matrix asphalt pavement is difficult to meet the ability to withstand high loads for a long time, causing a large number of original pavements to suffer from fatigue cracking, water damage and other road hazards due to weak rutting resistance; on the other hand, with the rise of the automobile industry, the number of vehicles has increased year by year, and with it comes a large number of waste tires. Rubber is a polymer material with a relatively complex composition and is difficult to degrade. For the treatment of waste tires, most of them are placed on open ground or burned. This practice not only pollutes the land, hinders plant growth, and occupies land resources, but also produces a large amount of toxic gases during combustion, which does not actively respond to the country's green environmental protection policies.

[0003] Since rubber has good wear resistance and toughness, adding rubber powder to asphalt can make up for the shortcomings of base asphalt, which not only improves the heat resistance of base asphalt, reduces road noise, and improves the road crack resistance at low temperatures, but also reduces road damage to a certain extent, prolongs road use time, and reduces concrete shrinkage. It also solves the problem of rubber being difficult to handle, turning waste into treasure, and actively responding to green transportation. However, compared with SBS modified asphalt, the shortcomings of rubber modified asphalt such as segregation and poor storage stability have not been well solved. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a high-stability rubber composite modified asphalt and a preparation method thereof. The rubber composite modified asphalt provided by the present invention not only meets the basic index requirements of asphalt products, but also has excellent storage stability.

[0005] The present invention provides a high-stability rubber composite modified asphalt, which comprises, by weight:

[0006]

[0007] The petroleum asphalt is 70# road petroleum asphalt with a needle penetration of 60 to 801 / 10mm;

[0008] The SBS modifier is a styrene-butadiene-styrene block copolymer, the mass ratio of the styrene segment to the butadiene segment in the block copolymer is 30:70, and the weight average molecular weight of the block copolymer is 150,000 to 250,000;

[0009] The rubber modifier is devulcanized rubber particles with a particle size of 30 to 60 meshes.

[0010] Preferably, the stabilizer comprises sulfur, butyl rubber, EPDM rubber, nitrile rubber and butadiene rubber.

[0011] Preferably, the components of the co-solvent include surfactant, non-rubber oil and furfural extracted oil.

[0012] Preferably, the density of the cosolvent is 0.95 to 1.05 g / cm 3 , flash point ≥230℃.

[0013] Preferably, the viscosity of the high-stability rubber composite modified asphalt at 180°C is 0.7 to 3 Pa·s.

[0014] The present invention provides a method for preparing the high-stability rubber composite modified asphalt described in the above technical solution, comprising the following steps:

[0015] Heat the petroleum asphalt to a fluid state; then add the rubber modifier and the co-solvent, stir and swell; then add the SBS modifier, shear and mix; finally add the stabilizer, stir and develop, and obtain a high-stability rubber composite modified asphalt.

[0016] Preferably, the stirring and swelling is carried out at a temperature of 175 to 180° C. and for a time of 0.5 to 2 h.

[0017] Preferably, after adding the SBS modifier, stirring and mixing are first performed, and then shear mixing is performed.

[0018] Preferably, the shear mixing has a rotation speed of 3000-5000 rpm, a temperature of 175-180° C., and a time of 0.5-2 h.

[0019] Preferably, the stirring and growing process is carried out at a temperature of 180 to 185° C. and for a time of 6 to 12 hours.

[0020] Compared with the prior art, the present invention provides a high-stability rubber composite modified asphalt and a preparation method thereof. In terms of mass fractions, the components of the rubber composite modified asphalt provided by the present invention include: 100 parts of petroleum asphalt, 2 to 3 parts of SBS modifier, and 20 to 30 parts of rubber modifier. 0.1 to 0.3 parts of stabilizer, 2 to 3 parts of cosolvent; the petroleum asphalt is 70# road petroleum asphalt, and the needle penetration is 60 to 801 / 10mm; the SBS modifier is a styrene-butadiene-styrene block copolymer, the mass ratio of styrene segments to butadiene segments in the block copolymer is 30:70, and the weight average molecular weight of the block copolymer is 150,000 to 250,000; the rubber modifier is desulfurized rubber particles, and the particle size is 30 to 60 meshes. The present invention uses 70# road petroleum asphalt as the base asphalt, with a wide range of raw materials and a simple preparation process; at the same time, two types of modifiers (SBS modifier and rubber modifier) ​​are used to ensure the storage stability of the product; on this basis, by introducing a co-solvent, more effective ingredients in the modifier can be dissolved and released, thereby enhancing the effect of the modification. In addition, the present invention preferably controls the 180°C viscosity of the rubber composite modified asphalt to 1-3 Pa·s, thereby reducing the problem of high viscosity in product production and construction while ensuring product indicators, and can effectively reduce the difficulty of production and construction and energy consumption. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present invention provides a high-stability rubber composite modified asphalt, which comprises, by weight:

[0023]

[0024] In the rubber composite modified asphalt provided by the present invention, the petroleum asphalt is 70# road petroleum asphalt, and the needle penetration is 60-801 / 10mm.

[0025] In the rubber composite modified asphalt provided by the present invention, the SBS modifier is a styrene-butadiene-styrene block copolymer, the mass ratio of the styrene segment to the butadiene segment in the block copolymer is 30:70, and the weight average molecular weight of the block copolymer is 150,000 to 250,000, specifically 150,000, 160,000, 170,000, 180,000, 190,000, 200,000, 210,000, 220,000, 230,000, 240,000 or 250,000.

[0026] In the rubber composite modified asphalt provided by the present invention, based on 100 parts by mass of petroleum asphalt, the content of the SBS modifier may be 2 parts by mass, 2.1 parts by mass, 2.2 parts by mass, 2.3 parts by mass, 2.4 parts by mass, 2.5 parts by mass, 2.6 parts by mass, 2.7 parts by mass, 2.8 parts by mass, 2.9 parts by mass or 3 parts by mass.

[0027] In the rubber composite modified asphalt provided by the present invention, the rubber modifier is desulfurized rubber particles with a particle size of 30 to 60 meshes, specifically 30 meshes, 35 meshes, 40 meshes, 45 meshes, 50 meshes, 55 meshes or 60 meshes.

[0028] In the rubber composite modified asphalt provided by the present invention, based on 100 parts by mass of petroleum asphalt, the content of the rubber modifier may specifically be 20 parts by mass, 21 parts by mass, 22 parts by mass, 23 parts by mass, 24 parts by mass, 25 parts by mass, 26 parts by mass, 27 parts by mass, 28 parts by mass, 29 parts by mass or 30 parts by mass.

[0029] In the rubber composite modified asphalt provided by the present invention, the components of the stabilizer preferably include sulfur, butyl rubber, EPDM rubber, nitrile rubber and butadiene rubber. The stabilizer mainly causes the modifier to undergo crosslinking in the asphalt to form a network structure, thereby increasing the thermal stability and toughness of the asphalt, making the penetration ratio of the asphalt larger after hot storage, the softening point change smaller, and the performance more stable.

[0030] In the rubber composite modified asphalt provided by the present invention, based on 100 parts by mass of petroleum asphalt, the content of the stabilizer may be 0.1 parts by mass, 0.11 parts by mass, 0.12 parts by mass, 0.13 parts by mass, 0.14 parts by mass, 0.15 parts by mass, 0.16 parts by mass, 0.17 parts by mass, 0.18 parts by mass, 0.19 parts by mass, 0.2 parts by mass, 0.21 parts by mass, 0.22 parts by mass, 0.23 parts by mass, 0.24 parts by mass, 0.25 parts by mass, 0.26 parts by mass, 0.27 parts by mass, 0.28 parts by mass, 0.29 parts by mass or 0.3 parts by mass.

[0031] In the rubber composite modified asphalt provided by the present invention, the components of the cosolvent preferably include surfactants, non-rubber oil and furfural extracted oil, and the aromatic content of the non-rubber oil is preferably not less than 70wt%; the density of the cosolvent is preferably 0.95-1.05g / cm 3 ; The flash point of the co-solvent is preferably ≥230°C.

[0032] In the rubber composite modified asphalt provided by the present invention, based on 100 parts by mass of petroleum asphalt, the content of the co-solvent may be 2 parts by mass, 2.1 parts by mass, 2.2 parts by mass, 2.3 parts by mass, 2.4 parts by mass, 2.5 parts by mass, 2.6 parts by mass, 2.7 parts by mass, 2.8 parts by mass, 2.9 parts by mass or 3 parts by mass.

[0033] In the rubber composite modified asphalt provided by the present invention, the viscosity of the high-stability rubber composite modified asphalt at 180°C is preferably 0.7-3 Pa·s, specifically 0.7 Pa·s, 0.72 Pa·s, 0.8 Pa·s, 0.9 Pa·s, 1 Pa·s, 1.1 Pa·s, 1.2 Pa·s, 1.28 Pa·s, 1.3 Pa·s, 1.4 Pa·s, 1.44 Pa·s, 1.5 Pa·s, 1.6 Pa·s, 1.7 Pa·s, 1.8 Pa·s, 1.9 Pa·s, 2 Pa·s, 2.1 Pa·s, 2.19 Pa·s, 2.2 Pa·s, 2.3 Pa·s, 2.4 Pa·s, 2.5 Pa·s, 2.6 Pa·s, 2.7 Pa·s, 2.8 Pa·s, 2.9 Pa·s or 3 Pa·s.

[0034] The present invention also provides a method for preparing the high-stability rubber composite modified asphalt described in the above technical solution, comprising the following steps:

[0035] Heat the petroleum asphalt to a fluid state; then add the rubber modifier and the co-solvent, stir and swell; then add the SBS modifier, shear and mix; finally add the stabilizer, stir and develop, and obtain a high-stability rubber composite modified asphalt.

[0036] In the preparation method provided by the present invention, the temperature heated to the flow state is preferably 130-140°C, specifically 130°C, 131°C, 132°C, 133°C, 134°C, 135°C, 136°C, 137°C, 138°C, 139°C or 140°C.

[0037] In the preparation method provided by the present invention, the stirring and swelling temperature is preferably 175-180°C, specifically 175°C, 176°C, 177°C, 178°C, 179°C or 180°C; the stirring and swelling time is preferably 0.5-2h, specifically 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2h.

[0038] In the preparation method provided by the present invention, after the SBS modifier is added, it is preferred to first perform stirring and mixing, and then perform shear mixing. wherein, the stirring and mixing time is preferably 10 to 60 min, specifically 10 min, 20 min, 30 min, 40 min, 50 min or 60 min; the shear mixing speed is preferably 3000 to 5000 rpm, specifically 3000 rpm, 3500 rpm, 4000 rpm, 4500 rpm or 5000 rpm; the shear mixing temperature is preferably 175 to 180°C, specifically 175°C, 176°C, 177°C, 178°C, 179°C or 180°C; the shear mixing time is preferably 0.5 to 2 h, specifically 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, 1.1 h, 1.2 h, 1.3 h, 1.4 h, 1.5 h, 1.6 h, 1.7 h, 1.8 h, 1.9 h or 2 h.

[0039] In the preparation method provided by the present invention, the stirring and developing temperature is preferably 180-185°C, specifically 180°C, 181°C, 182°C, 183°C, 184°C or 185°C; the stirring and developing time is preferably 6-12h, specifically 6h, 7h, 8h, 9h, 10h, 11h or 12h.

[0040] The technical solution provided by the present invention uses 70# road petroleum asphalt as the base asphalt, with a wide range of raw materials and a simple preparation process; at the same time, two types of modifiers (SBS modifier and rubber modifier) ​​are used to ensure the storage stability of the product; on this basis, by introducing a co-solvent, more effective ingredients in the modifier can be dissolved and released, thereby enhancing the effect of the modification. In addition, the present invention preferably controls the 180°C viscosity of the rubber composite modified asphalt to 1-3 Pa·s, which reduces the problem of high viscosity in product production and construction while ensuring product indicators, and can effectively reduce the difficulty of production and construction and energy consumption.

[0041] For the purpose of greater clarity, the invention is described in detail through the following examples.

[0042] In the following embodiments of the present invention, the rubber modifier used is desulfurized rubber particles with a particle size of 40 mesh; the cosolvent used is a modified asphalt special oil provided by Mantec, which mainly contains surfactants, non-rubber oil (aromatic content is not less than 70wt%), furfural extracted oil substances, and has a density of 0.95-1.05g / cm 3, flash point greater than 230°C; the SBS modifier used is Yueyang Petrochemical YH-791, in which the mass ratio of styrene segment to butadiene segment is 30:70, and the weight-average molecular weight is 150,000 to 250,000; the stabilizer used is Boyue rubber powder asphalt modified stabilizer, the main components of which are sulfur, butyl rubber, EPDM rubber, nitrile rubber, and butadiene rubber.

[0043] Example 1

[0044] First, the base asphalt (Haiyun 70#) was heated at 135°C until the sample was easy to flow, 20% mass fraction of rubber modifier and 2.3% mass fraction of co-solvent were added, and the sample was heated to 175°C under stirring, and then stirred and swelled at this temperature for 1 hour. After the rubber particles were fully swollen, 3% SBS modifier was added, and stirring and swelling was continued for 30 minutes. After the swelling process was completed, shearing operation was performed by a high-speed shearing machine with a shearing speed of 4000 rpm, a shearing time of 1 hour, and a shearing temperature of 175-180°C. After the shearing was completed, 0.25% mass fraction of stabilizer was added under stirring, and stirred and developed at 180°C for 8 hours to obtain a rubber composite modified asphalt sample.

[0045] Example 2

[0046] First, the base asphalt (Haiyun 70#) was heated at 135°C until the sample was easy to flow, 25% mass fraction of rubber modifier and 2.3% mass fraction of co-solvent were added, and the sample was heated to 175°C under stirring, and then stirred and swelled at this temperature for 1 hour. After the rubber particles were fully swollen, 3% SBS modifier was added, and stirring and swelling was continued for 30 minutes. After the swelling process was completed, shearing operation was performed by a high-speed shearing machine with a shearing speed of 4000 rpm, a shearing time of 1 hour, and a shearing temperature of 175-180°C. After the shearing was completed, 0.25% mass fraction of stabilizer was added under stirring, and stirred and developed at 180°C for 8 hours to obtain a rubber composite modified asphalt sample.

[0047] Example 3

[0048] First, the base asphalt (Haiyun 70#) was heated at 135°C until the sample was easy to flow, 30% by mass of rubber modifier and 3% by mass of co-solvent were added, and the sample was heated to 175°C under stirring, and then stirred and swelled at this temperature for 1 hour. After the rubber particles were fully swollen, 2.5% of SBS modifier was added, and the stirring and swelling was continued for 30 minutes. After the swelling process was completed, shearing operation was performed by a high-speed shearing machine with a shearing speed of 4000 rpm, a shearing time of 1 hour, and a shearing temperature of 175-180°C. After the shearing was completed, 0.25% by mass of stabilizer was added under stirring, and stirred and developed at 180°C for 8 hours to obtain a rubber composite modified asphalt sample.

[0049] Example 4

[0050] First, the base asphalt (Haiyun 70#) was heated at 135°C until the sample was easy to flow, 30% by mass of rubber modifier and 3% by mass of co-solvent were added, and the sample was heated to 175°C under stirring, and then stirred and swollen at this temperature for 1 hour. After the rubber particles were fully swollen, 3% of SBS modifier was added, and the stirring and swelling was continued for 30 minutes. After the swelling process was completed, shearing operation was performed by a high-speed shearing machine with a shearing speed of 4000 rpm, a shearing time of 1 hour, and a shearing temperature of 175-180°C. After the shearing was completed, 0.25% by mass of stabilizer was added under stirring, and stirred and developed at 180°C for 8 hours to obtain a rubber composite modified asphalt sample.

[0051] Performance data

[0052] The rubber composite modified asphalt samples prepared in Examples 1 to 4 were tested, and the results are shown in the following table:

[0053] Test items Index requirements Example 1 Example 2 Example 3 Example 4 Needle penetration, 25℃, 0.1mm 50～70 59 63 67 60 Softening point, ℃ ＞60 76 81 79 84 Elongation at 5℃, cm ＞20 24 27 26 28 Flash point, °C ＞240 269 278 270 272 Elastic recovery (25℃), % ＞60 90 91 90 92 Penetration Index PI -- 1.6 2.1 1.8 1.3 180℃ rotational viscosity, Pa·s 1.0～3.0 0.72 1.44 1.28 2.19 Separation, ℃ ≤2.5 5 0.7 0.1 0.2

[0054] It can be seen from the test results in the table that the rubber composite modified asphalt prepared by this method has good product performance and good segregation test results, indicating that the product has excellent storage stability and can effectively solve the problem that rubber modified asphalt cannot be transported over long distances and has a small radiation radius.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high stability rubber composite modified asphalt, characterized in that: In terms of mass fraction, the ingredients include: The petroleum asphalt is 70# road petroleum asphalt with a needle penetration of 60 to 801 / 10mm; The SBS modifier is a styrene-butadiene-styrene block copolymer, the mass ratio of the styrene segment to the butadiene segment in the block copolymer is 30:70, and the weight average molecular weight of the block copolymer is 150,000 to 250,000; The rubber modifier is devulcanized rubber particles with a particle size of 30 to 60 meshes.

2. The high stability rubber composite modified asphalt according to claim 1, characterized in that: The stabilizer comprises sulfur, butyl rubber, EPDM rubber, nitrile rubber and butadiene rubber.

3. The high stability rubber composite modified asphalt according to claim 1, characterized in that: The components of the co-solvent include surfactant, non-rubber oil and furfural extracted oil.

4. The high stability rubber composite modified asphalt according to claim 1, characterized in that: The density of the cosolvent is 0.95-1.05 g / cm 3 , flash point ≥230℃.

5. The high stability rubber composite modified asphalt according to claim 1, characterized in that: The high-stability rubber composite modified asphalt has a viscosity of 0.7-3 Pa·s at 180°C.

6. A method for preparing the high-stability rubber composite modified asphalt according to any one of claims 1 to 5, characterized in that: The following steps are involved: Heat the petroleum asphalt to a fluid state; then add the rubber modifier and the co-solvent, stir and swell; then add the SBS modifier, shear and mix; finally add the stabilizer, stir and develop, and obtain a high-stability rubber composite modified asphalt.

7. The preparation method according to claim 6, characterized in that: The stirring and swelling is performed at a temperature of 175 to 180° C. and for a time of 0.5 to 2 hours.

8. The preparation method according to claim 6, characterized in that: After the SBS modifier is added, stirring and mixing are first performed, and then shear mixing is performed.

9. The preparation method according to claim 6, characterized in that: The shear mixing has a rotation speed of 3000-5000 rpm, a temperature of 175-180° C., and a time of 0.5-2 h.

10. The preparation method according to claim 6, characterized in that: The stirring and developing step is performed at a temperature of 180 to 185° C. and for a time of 6 to 12 hours.

Images