CN112608610A - Special additive for low-temperature-resistant high-modulus asphalt mixture and preparation method thereof - Google Patents
Special additive for low-temperature-resistant high-modulus asphalt mixture and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of road engineering construction, in particular to a special low-temperature-resistant high-modulus asphalt mixture additive and a preparation method thereof. The technical points are as follows: the composition comprises the following components in parts by weight: 100 parts of a main agent, 30-50 parts of a waste plastic mixture, 10-20 parts of styrene butadiene rubber, 100-150 parts of rock asphalt particles and 1-3 parts of a compatibilizer; the main agent is a ternary nano composite material consisting of 10-15 parts of polyurethane prepolymer, 5-10 parts of polyethylene wax and 3-7 parts of filler. The special additive for the high-modulus asphalt mixture has good compatibility with asphalt and the mixture, not only obviously improves the low-temperature cracking resistance of the high-modulus asphalt mixture, but also has excellent anti-rutting performance and water invasion resistance, and simultaneously has lower mixing temperature of the mixture and good construction workability.
Description
Technical Field
The invention relates to the technical field of road engineering construction, in particular to a special low-temperature-resistant high-modulus asphalt mixture additive and a preparation method thereof.
Background
The high-modulus asphalt concrete (HMAC) is used in France for more than 30 years, can reduce the strain modulus of the asphalt concrete, greatly improve the high-temperature deformation resistance of an asphalt concrete pavement, delay the generation of ruts, reduce the rut depth, prolong the service life of the pavement and prolong the maintenance period.
At present, many reports about high modulus modifiers are provided, wherein a French product PR PLASTS and a German product Domix can improve the rutting resistance of the asphalt pavement, but the price is high, the mixing amount is high, and the waterproof effect of a mixture is poor. Some anti-rut agent products are available in China, the price is low, but the performance is unstable, and the difference between the domestic and foreign countries is obvious particularly in the aspects of dynamic modulus and low-temperature performance. CN200710178915.1 discloses an asphalt mixture anti-rutting additive, a preparation method and a use method thereof, the additive is a mixture of polyethylene resin and polypropylene resin, the melt index is low, the additive is not easy to disperse, the low-temperature performance is poor, the aging is serious, and the modifier is difficult to melt in the asphalt mixture at a normal blending temperature, so the durability of a pavement is easy to reduce. CN200910129486 discloses a novel anti-rutting agent, which adopts the technical scheme of combining rock asphalt, polyethylene and diatomite, and has simple process, but the problems of difficult feeding and the like easily occur in the granulation process. Patent CN201110141313 adopts low density polyethylene, softener, high density polyethylene and polycarbonate vinegar to prepare various high modulus modifiers, but the modifiers cannot reduce blending and forming temperature, are difficult to be used in low temperature environment in winter, and the low temperature performance of the mixture is insufficient. The high modulus modifier prepared by the report only improves the high temperature performance of the asphalt mixture, but can damage the low temperature performance of the asphalt mixture.
In view of the defects of the existing high modulus modifier, the inventor develops a special additive for low temperature resistant high modulus asphalt mixture and a preparation method thereof based on years of design and manufacture of the product, with abundant practical experience and professional knowledge, skillfully and fully applying chemical mechanism, and continuously researching and innovating in practice. The invention with practical value is finally created through continuous research and design and repeated tests and improvements.
Disclosure of Invention
The invention aims to provide a low-temperature-resistant high-modulus additive special for an asphalt mixture, which is good in compatibility with asphalt and the mixture, remarkably improves the low-temperature cracking resistance of the high-modulus asphalt mixture, has excellent anti-rutting performance and water invasion resistance, and is low in mixture blending temperature and good in construction workability.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a special additive for a low-temperature-resistant high-modulus asphalt mixture, which comprises the following components in parts by weight: 100 parts of a main agent, 30-50 parts of a waste plastic mixture, 10-20 parts of styrene butadiene rubber, 100-150 parts of rock asphalt particles and 1-3 parts of a compatibilizer; the main agent is a ternary nano composite material consisting of 10-15 parts of polyurethane prepolymer, 5-10 parts of polyethylene wax and 3-7 parts of filler.
Further, the polyurethane prepolymer is a polyether type single-component polyurethane prepolymer. The NCO in the polyurethane molecules and the OH in the asphalt molecules are subjected to chain extension reaction, so that the asphalt molecular chain is lengthened, the flexibility is improved, and the low-temperature crack resistance of the high-modulus asphalt mixture can be obviously improved.
Further, the melting point of the polyethylene wax is lower than 100 ℃. The low-melting-point polyethylene paraffin can reduce the mixing and compacting temperature of the asphalt mixture and improve the easy compactibility of the high-modulus asphalt mixture.
Further, the filler is diatomite, montmorillonite, rectorite and nano SiO2One or a mixture of any two of the above raw materials is sieved by a 300-mesh sieve.
Furthermore, the sizes of the diatomite, the montmorillonite and the rectorite are all nano-scale. The filler can form a very stable insertion layer type/stripping type structure with asphalt/polyurethane and other polymer additives, and the layers of diatomite, montmorillonite and rectorite are uniformly dispersed in an asphalt matrix to prevent air from diffusing in the asphalt matrix, so that the thermal degradation of polyurethane is delayed, the interconversion among various components of asphalt and the volatilization of light components are inhibited, the content of oxidation products is reduced, the movement of asphalt molecular chains can be effectively limited, the mechanical property, the heat resistance and the oxygen aging property of a high-modulus asphalt mixture can be effectively improved, and the durability of the high-modulus asphalt mixture is improved.
Further, the waste plastic mixture comprises the following components in parts by weight: 20-30 parts of waste plastic and 5-8 parts of diluent3-5 parts of 8-hydroxyquinoline aluminum complex. The addition of the 8-hydroxyquinoline aluminum complex can modify the waste plastics, on one hand, the toughness of the waste plastics and the compatibility of the waste plastics and the asphalt are improved, further, the low-temperature crack resistance of the asphalt mixture is improved, and on the other hand, the waste plastics and the nanometer diatomite, the montmorillonite, the rectorite or the nanometer SiO2And a synergistic effect is formed, and the large steric hindrance of the synergistic effect inhibits the movement of a molecular chain, so that the mechanical property and the heat resistance of the high-modulus asphalt mixture are improved.
Furthermore, the waste plastic is one or a mixture of any two of polyethylene, polypropylene and EVA resin.
Further, the diluent is any one of thiochroman-3-one, thiochroman or 2-hydroxy-4H-1-thiochroman-4-one or a mixture of several of them. By adopting the diluent, the viscosity of the waste plastic can be reduced, and meanwhile, a three-dimensional interpenetrating network is formed by adding the benzothiopyran, so that the low-temperature cracking performance of the asphalt mixture is improved.
Further, the rock asphalt particles are preferably high-ash rock asphalt particles, the ash content is about 75%, and the softening point is above 300 ℃. The high-ash rock asphalt particles have various organic chains capable of promoting active groups in the petroleum asphalt to be crosslinked and polymerized, can improve the arrangement mode and the network structure of petroleum asphalt molecules, enhance the cohesion of the asphalt and obviously improve the anti-rutting performance of the high-modulus asphalt mixture. Meanwhile, nitrogen elements in the high-ash rock asphalt particles exist in a functional group form, so that the high-ash rock asphalt particles have strong wettability and high resistance to free oxidizing radicals, the adhesion of asphalt and aggregate is enhanced, and the water stability of the high-modulus asphalt mixture is improved.
Further, the compatibilizer in the present invention is preferably maleic anhydride.
The second purpose of the invention is to provide a preparation method of the special additive for the low-temperature-resistant high-modulus asphalt mixture, which has the same technical effect.
The technical effects of the invention are realized by the following technical scheme:
the invention provides a preparation method of a special low-temperature-resistant high-modulus asphalt mixture additive, which is characterized by comprising the following operation steps of:
s1, placing a polyurethane prepolymer, polyethylene wax and a filler in a reaction kettle at 100-120 ℃ to be uniformly mixed to form a molten mass, so as to obtain a main agent;
s2, mixing the main agent, the waste plastic mixture, the styrene butadiene rubber, the rock asphalt particles and the compatibilizer to prepare the low-temperature-resistant high-modulus asphalt mixture special additive.
As the optimization of the technical scheme, the special additive for the low-temperature-resistant high-modulus asphalt mixture accounts for 1-1.2% of the mass of the asphalt mixture.
In conclusion, the invention has the following beneficial effects:
the special low-temperature-resistant high-modulus asphalt mixture additive prepared by the invention can simultaneously improve the high-temperature stability and the low-temperature crack resistance of asphalt, enhance the high-temperature anti-rutting performance, the low-temperature crack resistance and the water stability of an asphalt pavement, and effectively prolong the service life of the asphalt pavement.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the specific embodiments, features and effects of the additive for low temperature resistant high modulus asphalt mixture and the preparation method thereof according to the present invention are described in detail below.
Wherein, the polyether type single-component polyurethane prepolymer is purchased from Zibo Huatian rubber and plastic technology Limited.
Example 1: the special additive for the low-temperature-resistant high-modulus asphalt mixture comprises the following components in parts by weight: 100 parts of a main agent, 30-50 parts of a waste plastic mixture, 10-20 parts of styrene butadiene rubber, 100-150 parts of rock asphalt particles and 1-3 parts of a compatibilizer; the main agent is a ternary nano composite material consisting of 10-15 parts of polyurethane prepolymer, 5-10 parts of polyethylene wax and 3-7 parts of filler.
The preparation method comprises the following steps:
s1, placing a polyurethane prepolymer, polyethylene wax and a filler in a reaction kettle at 100-120 ℃ to be uniformly mixed to form a molten mass, so as to obtain a main agent;
s2, mixing the main agent, the waste plastic mixture, the styrene butadiene rubber, the rock asphalt particles and the compatibilizer to prepare the low-temperature-resistant high-modulus asphalt mixture special additive.
Example 2: the special additive for the low-temperature-resistant high-modulus asphalt mixture comprises the following components in parts by weight: 100 parts of a main agent, 50 parts of a waste plastic mixture, 20 parts of styrene butadiene rubber, 150 parts of rock asphalt particles and 3 parts of maleic anhydride; the main agent is a ternary nano composite material consisting of 15 parts of polyurethane prepolymer, 10 parts of polyethylene wax and 7 parts of nano diatomite.
The preparation method comprises the following steps:
s1, placing a polyurethane prepolymer, polyethylene wax and nano diatomite in a reaction kettle at 100-120 ℃ to be uniformly mixed to form a molten mass, so as to obtain a main agent;
s2, mixing the main agent, the waste plastic mixture, the styrene butadiene rubber, the rock asphalt particles and the maleic anhydride to prepare the low-temperature-resistant high-modulus asphalt mixture special additive.
Example 3: the special additive for the low-temperature-resistant high-modulus asphalt mixture comprises the following components in parts by weight: 100 parts of a main agent, 50 parts of a waste plastic mixture, 10-20 parts of comb type styrene butadiene rubber, 150 parts of rock asphalt particles and 1 part of maleic anhydride; the main agent is a ternary nano composite material consisting of 15 parts of polyurethane prepolymer, 5-10 parts of polyethylene wax and 7 parts of nano rectorite, wherein the melting point of the polyethylene wax is lower than 100 ℃.
The preparation method comprises the following steps:
s1, placing a polyurethane prepolymer, polyethylene wax and a filler in a reaction kettle at 100-120 ℃ to be uniformly mixed to form a molten mass, so as to obtain a main agent;
s2, mixing the main agent, the waste plastic mixture, the comb-type styrene butadiene rubber, the rock asphalt particles and the compatibilizer to prepare the special low-temperature-resistant high-modulus asphalt mixture additive.
Example 4: the special additive for the low-temperature-resistant high-modulus asphalt mixture comprises the following components in parts by weight: 100 parts of a main agent, 50 parts of a waste plastic mixture, 20 parts of star styrene-butadiene rubber, 150 parts of rock asphalt particles and 1 part of maleic anhydride; the main agent is a ternary nano composite material consisting of 15 parts of polyurethane prepolymer, 10 parts of polyethylene wax and 3 parts of nano montmorillonite, wherein the melting point of the polyethylene wax is lower than 100 ℃, the rock asphalt particles are high-ash rock asphalt particles, the ash content is about 75 percent, and the softening point is more than 300 ℃.
The preparation method comprises the following steps:
s1, placing a polyurethane prepolymer, polyethylene wax and nano montmorillonite in a reaction kettle at 100-120 ℃ to be uniformly mixed to form a molten mass, so as to obtain a main agent;
s2, mixing the main agent, the waste plastic mixture, the star-shaped styrene butadiene rubber, the rock asphalt particles and the compatibilizer to prepare the special low-temperature-resistant high-modulus asphalt mixture additive.
Example 5: the special additive for the low-temperature-resistant high-modulus asphalt mixture comprises the following components in parts by weight: 100 parts of a main agent, 50 parts of a waste plastic mixture, 20 parts of linear styrene-butadiene rubber, 150 parts of rock asphalt particles and 3 parts of maleic anhydride; the main agent comprises 15 parts of polyether type single-component polyurethane prepolymer, 5 parts of polyethylene wax and nano SiO27 parts of a ternary nanocomposite; wherein the melting point of the polyethylene wax is lower than 100 ℃, the rock asphalt particles are high-ash rock asphalt particles, the ash content is about 75%, and the softening point is more than 300 ℃; the waste plastic mixture comprises: 30 parts of polyethylene, 8 parts of thiochroman-3-ketone and 5 parts of 8-hydroxyquinoline aluminum complex.
The preparation method comprises the following steps:
s1, preparing polyurethane prepolymer, polyethylene wax and nano SiO2Uniformly mixing the mixture in a reaction kettle at the temperature of 100-120 ℃ to form a molten mass, and obtaining a main agent;
s2, mixing the main agent, the waste plastic mixture, the linear styrene butadiene rubber, the rock asphalt particles and the compatibilizer to prepare the low-temperature-resistant high-modulus asphalt mixture special additive.
Example 6: the special additive for the low-temperature-resistant high-modulus asphalt mixture comprises the following components in parts by weight: 100 parts of a main agent, 50 parts of a waste plastic mixture, 20 parts of linear styrene-butadiene rubber, 150 parts of rock asphalt particles and 3 parts of maleic anhydride; the main agent is a ternary nano composite material consisting of 15 parts of polyether type single-component polyurethane prepolymer, 5 parts of polyethylene wax and 3 parts of nano diatomite; wherein the melting point of the polyethylene wax is lower than 100 ℃, the rock asphalt particles are high-ash rock asphalt particles, the ash content is about 75%, and the softening point is more than 300 ℃; the waste plastic mixture comprises: 30 parts of EVA resin, 8 parts of 2-hydroxy-4H-1-benzothiopyran-4-one and 5 parts of 8-hydroxyquinoline aluminum complex.
The preparation method comprises the following steps:
s1, placing a polyurethane prepolymer, polyethylene wax and nano diatomite in a reaction kettle at 100-120 ℃ to be uniformly mixed to form a molten mass, so as to obtain a main agent;
s2, mixing the main agent, the waste plastic mixture, the linear styrene butadiene rubber, the rock asphalt particles and the compatibilizer to prepare the low-temperature-resistant high-modulus asphalt mixture special additive.
Performance testing
The special additive for the low-temperature-resistant high-modulus asphalt mixture obtained in the examples 1-6 is added into the asphalt mixture, wherein the special additive for the low-temperature-resistant high-modulus asphalt mixture accounts for 1% -1.2% of the mass of the asphalt mixture, and the high-temperature stability, the low-temperature crack resistance and the water stability of the asphalt mixture are tested. The test results are given in the following table:
the asphalts used in this test were: SBS modified asphalt PG76-22, mixture type: EME-14, its mineral aggregate mix proportion and gradation are as follows:
TABLE 1 mineral mix ratio and design oilstone ratio
TABLE 2 composite grading passage rate statement (Chinese standard sieve mesh)
TABLE 3 test results
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The special additive for the low-temperature-resistant high-modulus asphalt mixture is characterized by comprising the following components in parts by weight: 100 parts of a main agent, 30-50 parts of a waste plastic mixture, 10-20 parts of styrene butadiene rubber, 100-150 parts of rock asphalt particles and 1-3 parts of a compatibilizer; the main agent is a ternary nano composite material consisting of 10-15 parts of polyurethane prepolymer, 5-10 parts of polyethylene wax and 3-7 parts of filler.
2. The special additive for the low-temperature-resistant high-modulus asphalt mixture as claimed in claim 1, wherein the polyurethane prepolymer is a polyether-type single-component polyurethane prepolymer.
3. The special additive for low temperature resistant high modulus asphalt mixture as claimed in claim 1, wherein the melting point of the polyethylene paraffin wax is not more than 100 ℃.
4. The special additive for low-temperature-resistant high-modulus asphalt mixture according to claim 1, wherein the filler is diatomite, montmorillonite, rectorite, nano SiO2One or a mixture of any two of the above raw materials is sieved by a 300-mesh sieve.
5. The special additive for low temperature resistant high modulus asphalt mixture as claimed in claim 1, wherein the diatomite, montmorillonite and rectorite are all nano-sized.
6. The special additive for the low-temperature-resistant high-modulus asphalt mixture according to claim 1, wherein the waste plastic mixture comprises the following components in parts by weight: 20-30 parts of waste plastic, 5-8 parts of diluent and 3-5 parts of 8-hydroxyquinoline aluminum complex.
7. The special additive for low temperature resistant high modulus asphalt mixture according to claim 6, wherein the waste plastic is one or a mixture of any two of polyethylene, polypropylene and EVA resin.
8. The special additive for low temperature resistant high modulus asphalt mixture as claimed in claim 6, wherein said diluent is any one of thiochroman-3-one, thiochroman or 2-hydroxy-4H-1-thiochroman-4-one.
9. The low temperature resistant high modulus bituminous mixture according to claim 1, wherein said rock asphalt particles are high ash rock asphalt particles, having an ash content of 75% and a softening point of more than 300 ℃.
10. The preparation method of the special additive for the low-temperature-resistant high-modulus asphalt mixture according to any one of claims 1 to 9 is characterized by comprising the following operation steps:
s1, placing the polyurethane prepolymer, the polyethylene wax and the filler in a reaction kettle at 100-120 ℃ and uniformly mixing to form a molten mass to obtain a main agent;
and S2, mixing the main agent, the waste plastic mixture, the styrene butadiene rubber, the rock asphalt particles and the compatibilizer to prepare the special low-temperature-resistant high-modulus asphalt mixture additive.
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| CN202011496838.6A CN112608610A (en) | 2020-12-17 | 2020-12-17 | Special additive for low-temperature-resistant high-modulus asphalt mixture and preparation method thereof |
| PCT/CN2020/140501 WO2022126739A1 (en) | 2020-12-17 | 2020-12-29 | Low-temperature-resistant additive specially for high-modulus asphalt mixture and preparation method therefor |
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| CN202011496838.6A CN112608610A (en) | 2020-12-17 | 2020-12-17 | Special additive for low-temperature-resistant high-modulus asphalt mixture and preparation method thereof |
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| CN114368924A (en) * | 2021-12-31 | 2022-04-19 | 杭州航弘建设科技有限公司 | High modulus asphalt concrete additive, preparation method and application thereof |
| CN115785686A (en) * | 2022-12-21 | 2023-03-14 | 中路交科科技股份有限公司 | Composite multi-effect high-modulus tackifying modifier and preparation method thereof |
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| CN115893926B (en) * | 2022-12-28 | 2024-04-19 | 浙江航兴道路建设有限公司 | Anti-rutting asphalt mixture and preparation method thereof |
| CN115838507B (en) * | 2023-02-20 | 2023-05-09 | 天津市中泰创展科技有限公司 | High-strength degradable polyethylene casting film and preparation method thereof |
| CN116333417A (en) * | 2023-03-27 | 2023-06-27 | 广州工程技术职业学院 | 8-hydroxyquinoline aluminum complex modified polypropylene composite material and preparation method thereof |
| CN116396606B (en) * | 2023-05-12 | 2024-02-27 | 江苏路得沥环保材料有限公司 | Asphalt modifier and preparation method thereof |
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| CN114368924A (en) * | 2021-12-31 | 2022-04-19 | 杭州航弘建设科技有限公司 | High modulus asphalt concrete additive, preparation method and application thereof |
| CN115785686A (en) * | 2022-12-21 | 2023-03-14 | 中路交科科技股份有限公司 | Composite multi-effect high-modulus tackifying modifier and preparation method thereof |
| CN115785686B (en) * | 2022-12-21 | 2024-02-20 | 中路交科科技股份有限公司 | Composite multi-effect high-modulus tackifying modifier and preparation method thereof |
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| WO2022126739A1 (en) | 2022-06-23 |
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Application publication date: 20210406 |