CN108395709B - High-viscosity modified asphalt additive with aging resistance and preparation method thereof - Google Patents
High-viscosity modified asphalt additive with aging resistance and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses an anti-aging high-viscosity modified asphalt additive and a preparation method thereof. The high-viscosity modified asphalt additive comprises the following raw material components in parts by weight: 100 parts of SBS, 10-20 parts of low density polyethylene, 10-20 parts of acetic acid-vinyl acetate copolymer, 10-40 parts of aromatic oil, 2-8 parts of surface modified mesoporous molecular sieve and 1-4 parts of antioxidant; wherein, the surface modification mesoporous molecular sieve is a mercaptosilane modified mesoporous molecular sieve. The additive of the invention not only obviously improves the caking property of the asphalt, but also greatly improves the anti-aging property of the asphalt, and has good compatibility with the asphalt.
Description
Technical Field
The invention relates to a high-viscosity modified asphalt additive and a preparation method thereof, in particular to a high-viscosity modified asphalt additive with aging resistance and a preparation method thereof.
Background
The high-viscosity asphalt generally refers to asphalt with dynamic viscosity of more than 20000 Pa.s at 60 ℃, and is suitable for the application of open-graded anti-skid wearing course (OGFC) and other road surfaces. The OGFC road surface has good drainage, noise reduction and skid resistance due to the large void ratio. However, the structural characteristic of large void ratio also leads to the increase of the contact area of the asphalt with air and ultraviolet light, accelerates the aging of the asphalt and shortens the service life of the pavement.
At present, high-viscosity asphalt is mainly prepared by adding a polymer into asphalt, can obviously improve the high-temperature and low-temperature performances of the asphalt and improve the viscosity of the asphalt, but has the problems of uneven dispersion of the polymer, poor compatibility and the like. Meanwhile, the problem of insufficient ageing resistance exists.
CN101457009A discloses a high-viscosity asphalt modifier and a preparation method thereof, wherein the modifier comprises SIS, coumarone resin, oleamide and the like. The modifier has good compatibility with asphalt, and obviously improves the adhesion of the asphalt. However, the anti-aging problem of the high-viscosity asphalt is not considered, the anti-aging performance of the high-viscosity asphalt is insufficient, and the service life of the high-viscosity asphalt is influenced.
CN102838874A discloses an asphalt modifier, modified asphalt and an asphalt mixture. The high-viscosity asphalt modifier comprises waste tire rubber powder, polyethylene waste, a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, terpene resin, solvent oil, alcohol ether carboxylate and the like. The modified asphalt prepared by the modifier has better high and low temperature performances and water stability. But the used waste tire rubber powder still has the problems of poor compatibility with asphalt and insufficient aging resistance.
In summary, the prior art can improve the viscosity and adhesiveness of asphalt to some extent, but has the problems of poor polymer compatibility and insufficient aging resistance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-viscosity modified asphalt additive with aging resistance and a preparation method thereof. The high-viscosity modified asphalt additive not only obviously improves the cohesiveness of asphalt, but also greatly improves the anti-aging performance of the asphalt, and has good compatibility with the asphalt.
The invention provides an anti-aging high-viscosity modified asphalt additive which comprises the following raw material components in parts by weight:
SBS: 100 parts of (A);
low density polyethylene: 10-20 parts;
acetic acid-vinyl acetate copolymer: 10-20 parts;
aromatic oil: 10-40 parts;
surface modification of mesoporous molecular sieve: 2-8 parts, preferably 4-6 parts;
antioxidant: 1-4 parts;
wherein, the surface modification mesoporous molecular sieve is a mercaptosilane modified mesoporous molecular sieve.
The dosage of the mercaptosilane is 2 to 15 percent of the mass of the mesoporous molecular sieve, preferably 5 to 10 percent.
The antioxidant may be a hindered phenol type antioxidant. The antioxidant is one or more of 2, 6-di-tert-butyl-p-cresol, p-tert-butyl catechol, 3, 5-di-tert-butyl-4-hydroxybenzyl diethyl phosphonate, n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, isooctyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 4' -thiobis (6-tert-butyl-3-methylphenol), pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene.
The mesoporous molecular sieve is one or more of MCM-41, MCM-22, MCM-48, SBA-15, SBA-16 and HMS molecular sieves, and one or more of MCM-41, SBA-15 and MCM-48 molecular sieves are preferably selected.
The specific surface area of the mesoporous molecular sieve is preferably 600-1250 m2/g。
The mercaptosilane is one or more of gamma-mercaptopropyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane and gamma-mercaptopropylmethyldiethoxysilane.
The SBS has a linear structure and the molecular weight of the SBS is 5-25 ten thousand.
The low-density polyethylene can be recycled waste materials, and the melt flow index is 2-30 g/10 min.
The melt flow index of the acetic acid-vinyl acetate copolymer is 10-40 g/10 min.
In the aromatic oil, the weight content of the aromatic hydrocarbon is 40-80%. The aromatic oil is a component rich in aromatic hydrocarbon, and can be derived from extract oil of lubricating oil base oil in a solvent refining process, such as furfural refined extract oil, phenol refined extract oil and the like.
The invention also provides a preparation method of the high-viscosity modified asphalt additive with the aging resistance, which comprises the following steps:
(1) adding mesoporous molecular sieve and mercaptosilane into organic solvent, carrying out surface modification reaction under heating reflux condition, cooling, filtering, washing, drying to obtain surface modified mesoporous molecular sieve,
(2) the SBS, the low-density polyethylene, the acetic acid-vinyl acetate copolymer, the aromatic oil, the surface modified mesoporous molecular sieve and the antioxidant are uniformly mixed, and then are subjected to blending extrusion and granulation by an extruder to obtain the high-viscosity modified asphalt additive with the ageing resistance.
The weight ratio of the mesoporous molecular sieve to the organic solvent is 1: (10-30), and the organic solvent is preferably one or more of xylene, toluene, cyclohexanone, chlorobenzene and pyridine.
In the step (1), the temperature of the surface modification reaction is 100-120 ℃ and the time is 1-3 h.
In step (1), the filtration, washing and drying can adopt the conventional method. The washing can be carried out by using solvents such as ethanol, chloroform, acetone and the like, and the drying is carried out to volatilize the solvents, wherein the drying temperature can be 80-120 ℃, and the drying time is 0.5-5 h.
In the step (2), the extruder can be a conventionally used extruder, preferably a screw extruder, the extrusion temperature is 130-160 ℃, and the screw rotation speed is 30-150 r/min. The twin-screw extruder is further preferred, the two screws are parallel to each other in the barrel, the temperature in the barrel can be controlled in multiple sections, for example, the barrel of the extruder can be divided into eight temperature sections, and the specific operating conditions are as follows: the temperature of one section is 130-150 ℃; the second section is 135-155 ℃; the three sections are 140-160 ℃; the fourth section is 140-160 ℃; the fifth section is 150-160 ℃; the six sections are 150-160 ℃; the seven sections are 145-160 ℃; the eight sections are 150-160 ℃.
Compared with the prior art, the high-viscosity modified asphalt additive with the aging resistance and the preparation method thereof have the following advantages:
(1) the invention adds the mesoporous molecular sieve modified by the surface of the mercaptosilane into the additive, and the mercapto group of the mesoporous molecular sieve can be used as an auxiliary antioxidant to decompose hydroperoxide and convert the hydroperoxide into a stable product without free radicals, thereby avoiding the free radical chain reaction further initiated by the free radicals generated by the hydroperoxide, and the hindered antioxidant can eliminate the free radicals existing in the asphalt, thereby avoiding the free radical chain reaction of organic matters in the asphalt, so that the mercapto group and the main antioxidant (hindered phenol antioxidant) generate synergistic action to greatly improve the anti-aging performance of the asphalt.
(2) The invention can adopt recycled waste plastics (including low-density polyethylene) as raw materials, has lower production cost and outstanding environmental benefit.
(3) The anti-aging high-viscosity modified asphalt additive can obviously improve the viscosity of asphalt and enhance the cohesiveness of the asphalt, not only can be directly added into the asphalt to prepare the high-viscosity modified asphalt, but also can be added in the process of mixing the mixture, and has convenient construction and simple use.
Detailed Description
The technical features of the present invention are further described below by way of examples, but these examples are not intended to limit the present invention, and wt% referred to is mass fraction.
Example 1
(1) 4 parts by weight of MCM-41 mesoporous molecular sieve (specific surface area1000 m2/g) of gamma-mercaptopropyltrimethoxysilane, which accounts for 5wt% of the MCM-41 mesoporous molecular sieve, was added to 80 parts by weight of toluene. Keeping the temperature at 110 ℃, continuously stirring, heating and refluxing for 3h, cooling, filtering, washing with a large amount of ethanol, and drying at 100 ℃ for 5h to obtain the surface modified mesoporous molecular sieve.
(2) Uniformly mixing 100 parts by weight of SBS (molecular weight is 10 ten thousand), 20 parts by weight of low density polyethylene (melt flow index is 5 g/10 min), 20 parts by weight of acetic acid-vinyl acetate copolymer (melt flow index is 10 g/10 min), 20 parts by weight of aromatic oil (aromatic hydrocarbon content is 40 wt%), 4 parts by weight of surface modified mesoporous molecular sieve and 2 parts by weight of 2, 6-di-tert-butyl-p-cresol, and then carrying out blending extrusion and granulation by a double-screw extruder to obtain the high-viscosity modified asphalt additive with ageing resistance. The extruder operating conditions were: the first section is 130 ℃; the second section is 135 ℃; the third section is 140 ℃; the fourth section is 140 ℃; the fifth section is 150 ℃; the six sections are 150 ℃; the seven sections are 145 ℃; the eight sections are at 150 ℃, and the rotating speed of the screw is 50 r/min.
Example 2
(1) 5 parts by weight of MCM-48 mesoporous molecular sieve (specific surface area is 800 m)2/g) and gamma-mercaptopropyltriethoxysilane accounting for 8wt% of the MCM-48 mesoporous molecular sieve are added into 100 parts by weight of toluene. Keeping the temperature at 120 ℃, continuously stirring, heating and refluxing for 2h, cooling, filtering, washing with a large amount of ethanol, and drying at 100 ℃ for 5h to obtain the surface modified mesoporous molecular sieve.
(2) Uniformly mixing 100 parts by weight of SBS (molecular weight is 15 ten thousand), 15 parts by weight of low density polyethylene (melt flow index is 10 g/10 min), 15 parts by weight of acetic acid-vinyl acetate copolymer (melt flow index is 10 g/10 min), 30 parts by weight of aromatic oil (aromatic hydrocarbon content is 60 wt%), 5 parts by weight of surface modified mesoporous molecular sieve and 3 parts by weight of 4,4' -thiobis (6-tert-butyl-3-methylphenol), and then carrying out blending extrusion and granulation by a double screw extruder to obtain the high-viscosity modified asphalt additive with ageing resistance. The extruder operating conditions were: the first section is 140 ℃; the second section is 145 ℃; the third section is 150 ℃; the fourth section is 150 ℃; the fifth section is 155 ℃; the six sections are 155 ℃; the seven sections are 155 ℃; the eight sections are 155 ℃, and the screw rotating speed is 80 r/min.
Example 3
(1) 6 parts by weight of SBA-15 mesoporous molecular sieve (specific surface area of 1100 m)2/g) of gamma-mercaptopropylmethyldiethoxysilane accounting for 10wt% of the SBA-15 mesoporous molecular sieve was added to 120 parts by weight of toluene. Keeping the temperature at 120 ℃, continuously stirring, heating and refluxing for 3h, cooling, filtering, washing with a large amount of ethanol, and drying at 100 ℃ for 5h to obtain the surface modified mesoporous molecular sieve.
(2) Uniformly mixing 100 parts by weight of SBS (molecular weight is 20 ten thousand), 10 parts by weight of low density polyethylene (melt flow index is 20 g/10 min), 10 parts by weight of acetic acid-vinyl acetate copolymer (melt flow index is 20 g/10 min), 40 parts by weight of aromatic oil (aromatic hydrocarbon content is 80 wt%), 6 parts by weight of surface modified mesoporous molecular sieve and 4 parts by weight of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, and then carrying out blending extrusion and granulation by a double-screw extruder to obtain the high-viscosity modified asphalt additive with ageing resistance. The extruder operating conditions were: the first section is 150 ℃; the second section is 155 ℃; the third section is 160 ℃; the fourth section is 160 ℃; the fifth section is 160 ℃; the six sections are 160 ℃; the seven sections are 160 ℃; the eight sections are 160 ℃, and the rotating speed of the screw is 120 r/min.
Comparative example 1
100 parts by weight of SBS (molecular weight is 10 ten thousand), 20 parts by weight of low density polyethylene (melt flow index is 5 g/10 min), 20 parts by weight of acetic acid-vinyl acetate copolymer (melt flow index is 10 g/10 min), 20 parts by weight of aromatic oil (aromatic hydrocarbon content is 40 wt%), 3.8 parts by weight of MCM-41 mesoporous molecular sieve (specific surface area is 1000 m)2And/g), 0.2 part by weight of gamma-mercaptopropyl-trimethoxysilane and 2 parts by weight of 2, 6-di-tert-butyl-p-cresol, and then the mixture is subjected to blending extrusion and granulation by a double-screw extruder to obtain the high-viscosity modified asphalt additive with the anti-aging performance. The extruder operating conditions were: the first section is 130 ℃; the second section is 135 ℃; the third section is 140 ℃; the fourth section is 140 ℃; the fifth section is 150 ℃; the six sections are 150 ℃; the seven sections are 145 ℃; the eight sections are at 150 ℃, and the rotating speed of the screw is 50 r/min.
Comparative example 2
Uniformly mixing 100 parts by weight of SBS (molecular weight is 10 ten thousand), 20 parts by weight of low density polyethylene (melt flow index is 5 g/10 min), 20 parts by weight of acetic acid-vinyl acetate copolymer (melt flow index is 10 g/10 min), 20 parts by weight of aromatic oil (aromatic hydrocarbon content is 40 wt%), and 2 parts by weight of 2, 6-di-tert-butyl-p-cresol, and then carrying out blending extrusion and granulation by a double-screw extruder to obtain the high-viscosity modified asphalt additive with anti-aging performance. The extruder operating conditions were: the first section is 130 ℃; the second section is 135 ℃; the third section is 140 ℃; the fourth section is 140 ℃; the fifth section is 150 ℃; the six sections are 150 ℃; the seven sections are 145 ℃; the eight sections are at 150 ℃, and the rotating speed of the screw is 50 r/min.
Test example
The anti-aging high-viscosity modified asphalt additive was added in an amount of 12 parts by weight to 100 parts by weight of molten base asphalt (vacuum residue, 25 ℃ penetration 711/10 mm), and the mixture was uniformly dispersed in the base asphalt by high-speed shearing at 175 ℃ for 1 hour and stirring at the same temperature for 0.5 hour, and the obtained high-viscosity modified asphalt was tested and the results are shown in Table 1. Wherein the thin film oven test is performed according to the standard GB/T5304-2001.
TABLE 1 Properties of base asphalts and modified asphalts obtained in examples and comparative examples
| Base asphalt | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | |
| Penetration/25 deg.C, 0.1mm | 71 | 59 | 57 | 56 | 59 | 60 |
| 5 ℃ ductility/cm | 11 | 41 | 42 | 44 | 41 | 42 |
| Dynamic viscosity/pas at 60 DEG C | 210 | 102135 | 106832 | 109056 | 101057 | 98003 |
| Softening point/. degree.C | 47.9 | 89.8 | 90.5 | 91.0 | 89.7 | 89.5 |
| After the film oven test | ||||||
| Penetration ratio/%) | 67 | 75 | 77 | 81 | 70 | 69 |
| Residual ductility ratio/%) | - | 25 | 27 | 29 | 20 | 16 |
As can be seen from Table 1, the anti-aging high-viscosity modified asphalt additive of the invention can significantly improve the viscosity of asphalt. Compared with comparative examples 1 and 2, the asphalt modified by the method of the invention has small needle penetration loss and high residual ductility ratio after a film oven test, which shows that the aging resistance and stability of the asphalt are improved by adding the surface modified mesoporous molecular sieve and the antioxidant. Comparative example 1 the anti-aging effect was not as good as examples 1-3, mainly due to: the mercapto silane is not grafted to the mesoporous molecular sieve in a reaction way, and volatilization, physical migration and thermal decomposition exist, so that loss is caused, and therefore the anti-aging effect of the mercapto silane is not as good as that of the surface modified mesoporous molecular sieve.
Claims (20)
1. The high-viscosity modified asphalt additive with the aging resistance is characterized by comprising the following raw materials in parts by weight:
SBS: 100 parts of (A);
low density polyethylene: 10-20 parts;
acetic acid-vinyl acetate copolymer: 10-20 parts;
aromatic oil: 10-40 parts;
surface modification of mesoporous molecular sieve: 2-8 parts;
antioxidant: 1-4 parts;
wherein, the surface modified mesoporous molecular sieve is a mercaptosilane modified mesoporous molecular sieve; the antioxidant is a hindered phenol antioxidant;
the preparation method of the surface modified mesoporous molecular sieve comprises the following steps: adding the mesoporous molecular sieve and mercaptosilane into an organic solvent, carrying out surface modification reaction under the condition of heating reflux, cooling, filtering, washing and drying to obtain the surface modified mesoporous molecular sieve.
2. The additive according to claim 1, wherein the surface-modified mesoporous molecular sieve is present in an amount of 4 to 6 parts.
3. The additive of claim 1, wherein the mercaptosilane is present in an amount of 2% to 15% by weight of the mesoporous molecular sieve.
4. Additive according to claim 3, characterized in that the mercaptosilane is used in an amount of 5% to 10% by mass of the mesoporous molecular sieve.
5. Additive according to claim 1, the antioxidant is one or more of 2, 6-di-tert-butyl-p-cresol, p-tert-butyl catechol, 3, 5-di-tert-butyl-4-hydroxybenzyl diethyl phosphonate, n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, isooctyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 4' -thiobis (6-tert-butyl-3-methylphenol), pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene.
6. The additive of claim 1, wherein the mesoporous molecular sieve is one or more of MCM-41, MCM-22, MCM-48, SBA-15, SBA-16, HMS molecular sieves.
7. The additive of claim 6, wherein the mesoporous molecular sieve is one or more of MCM-41, SBA-15 and MCM-48 molecular sieves.
8. Additive according to claim 6 or 7, wherein the mesoporous molecular sieve has a specific surface area of 600 to 1250 m2/g。
9. The additive of claim 1, wherein the mercaptosilane is one or more of gamma-mercaptopropyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane, and gamma-mercaptopropylmethyldiethoxysilane.
10. The additive according to claim 1, wherein the SBS has a linear structure and a molecular weight of 5 to 25 ten thousand.
11. The additive according to claim 1, wherein the low density polyethylene has a melt flow index of 2 to 30 g/10 min.
12. The additive according to claim 1, wherein the melt flow index of the acetic acid-vinyl acetate copolymer is 10 to 40 g/10 min.
13. Additive according to claim 1, wherein the aromatic oil comprises 40% to 80% by weight of aromatic hydrocarbon.
14. A process for the preparation of an additive as claimed in any one of claims 1 to 13, comprising the steps of:
(1) adding mesoporous molecular sieve and mercaptosilane into organic solvent, carrying out surface modification reaction under heating reflux condition, cooling, filtering, washing, drying to obtain surface modified mesoporous molecular sieve,
(2) the SBS, the low-density polyethylene, the acetic acid-vinyl acetate copolymer, the aromatic oil, the surface modified mesoporous molecular sieve and the antioxidant are uniformly mixed, and then are subjected to blending extrusion and granulation by an extruder to obtain the high-viscosity modified asphalt additive with the ageing resistance.
15. The method of claim 14, wherein the weight ratio of the mesoporous molecular sieve to the organic solvent is 1: (10-30).
16. The method according to claim 15, wherein the organic solvent is one or more of xylene, toluene, cyclohexanone, chlorobenzene, and pyridine.
17. The method according to claim 14, wherein in the step (1), the temperature of the surface modification reaction is 100-120 ℃ and the time is 1-3 h.
18. The method according to claim 14, wherein in the step (1), the drying temperature is 80-120 ℃ and the drying time is 0.5-5 h.
19. The method according to claim 14, wherein in the step (2), the extruder is a screw extruder, the extrusion temperature is 130-160 ℃, and the screw rotation speed is 30-150 r/min.
20. The process of claim 19, wherein in step (2), the extruder is a twin screw extruder operating with eight temperature zones, wherein the operating conditions are as follows: the temperature of one section is 130-150 ℃; the second section is 135-155 ℃; the three sections are 140-160 ℃; the fourth section is 140-160 ℃; the fifth section is 150-160 ℃; the six sections are 150-160 ℃; the seven sections are 145-160 ℃; the eight sections are 150-160 ℃.
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| ES2957418A1 (en) * | 2022-06-03 | 2024-01-18 | Eng For Sustainable Pavements S L | ADDITIVE FOR THE PHYSICAL-CHEMICAL ACTIVATION OF RUBBER POWDER PARTICLES AND PRE-TREATED RUBBER OBTAINED THROUGH THE USE OF SAID ADDITIVE (Machine-translation by Google Translate, not legally binding) |
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| CN102838874B (en) * | 2012-09-17 | 2013-05-08 | 山东建筑大学 | Asphalt modifier, modified asphalt and asphalt mixture |
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Effective date of registration: 20230922 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: Sinopec (Dalian) Petrochemical Research Institute Co.,Ltd. Address before: 100020 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: DALIAN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC Corp. |