CN107629471B - Nano titanium dioxide modified emulsified asphalt and preparation method thereof - Google Patents
Nano titanium dioxide modified emulsified asphalt and preparation method thereof Download PDFInfo
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- CN107629471B CN107629471B CN201710712393.2A CN201710712393A CN107629471B CN 107629471 B CN107629471 B CN 107629471B CN 201710712393 A CN201710712393 A CN 201710712393A CN 107629471 B CN107629471 B CN 107629471B
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Abstract
The invention provides a nano titanium dioxide modified emulsified asphalt and a preparation method thereof, wherein the nano titanium dioxide modified emulsified asphalt is prepared from the following raw materials: asphalt, nano titanium dioxide, a silane coupling agent, aluminum salt, a stabilizing agent and water; adding water into the nano titanium dioxide powder to form a titanium dioxide solution; adding a silane coupling agent into a titanium dioxide solution to form a solution A; solution a was added to the bitumen with the addition of aluminium salt. The invention uses silane coupling agent to modify nanometer titanium dioxide to form oleophilic nanometer titanium dioxide for the first time, and uses the oleophilic nanometer titanium dioxide as emulsifier. The modified emulsified asphalt has the characteristics of long storage time, good dispersibility, timely demulsification in road engineering, good adhesion between the asphalt and mineral aggregate, improvement on the manufacturing process and the like.
Description
Technical Field
The invention belongs to the field of road materials, relates to modified emulsified asphalt, and particularly relates to nano titanium dioxide modified emulsified asphalt and a preparation method thereof.
Background
With the rapid advance of the road construction field in China, the requirements of people on the road surface are higher and higher. Emulsified asphalt is applied to roads more and more widely due to its unique characteristics: the emulsified asphalt is mainly used for upgrading and maintaining roads, such as stone chip sealing, and has various unique applications which cannot be replaced by other asphalt materials, such as cold-mixed materials and slurry sealing; the asphalt is paved at normal temperature, so that toxic gas emitted by asphalt at high temperature can be reduced, and the effect of reducing energy consumption is achieved. However, various common emulsified asphalts have the defects, such as unstable storage, leading to the phenomena of advanced demulsification, delamination and the like of the emulsified asphalts, so that the specific properties of the emulsified asphalts cannot be exerted; the asphalt can not reach the service life because the adhesion between the asphalt and the mineral aggregate is insufficient and the asphalt is peeled off from the mineral aggregate too early; the traditional emulsifier adopts a cationic emulsifier, an anionic emulsifier, an amphoteric emulsifier or a nonionic emulsifier, and the asphalt and the emulsifier can be fully contacted only by high-speed shearing when the emulsified asphalt is prepared; and excessive foaming can occur, affecting the properties of the emulsified asphalt.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a nano titanium dioxide modified emulsified asphalt and a preparation method thereof, and solve the technical problems of short storage time and poor dispersibility of the conventional emulsified asphalt.
In order to solve the technical problems, the invention adopts the following technical scheme:
the nanometer titanium dioxide modified emulsified asphalt comprises the following raw materials: asphalt, nano titanium dioxide, a silane coupling agent, aluminum salt, a stabilizing agent and water;
the preparation method of the nano titanium dioxide modified emulsified asphalt comprises the following steps:
step one, adding water with the temperature of 60-80 ℃ and the pH value of 5-7 into nano titanium dioxide powder to form a titanium dioxide solution;
adding a silane coupling agent into the titanium dioxide solution, and uniformly stirring to form a hydrophilic oleophilic nano titanium dioxide solution, namely a solution A;
and step three, adding the solution A into asphalt at the temperature of 110-130 ℃, simultaneously adding aluminum salt, stirring in a low-speed stirrer for 5-10 min to finally generate nano titanium dioxide modified emulsified asphalt, cooling to below 50 ℃, and storing at normal temperature.
The invention also has the following distinguishing technical characteristics:
the composite material is prepared from the following raw materials in parts by weight: 60-70 parts of asphalt, 3-7 parts of nano titanium dioxide, 2-6 parts of a silane coupling agent, 1-4 parts of aluminum salt, 1-3 parts of a stabilizer and the balance of water, wherein the sum of the parts by weight of the raw materials is 100 parts.
Preferably, the feed is prepared from the following raw materials in parts by weight: 63-65 parts of asphalt, 4-6 parts of nano titanium dioxide, 3-4 parts of a silane coupling agent, 2-3 parts of aluminum salt, 1-2 parts of a stabilizer and the balance of water, wherein the sum of the parts by weight of the raw materials is 100 parts.
More preferably, the feed additive is prepared from the following raw materials in parts by weight: 64 parts of asphalt, 5 parts of nano titanium dioxide, 4 parts of silane coupling agent, 3 parts of aluminum salt, 1 part of stabilizer and 23 parts of water.
The asphalt is matrix asphalt;
the nano titanium dioxide is hydrophilic anatase type nano titanium dioxide;
the stabilizer is polyvinyl alcohol;
the aluminum salt is aluminum chloride.
The preparation method of the nano titanium dioxide modified emulsified asphalt comprises the following steps:
step one, adding water with the temperature of 60-80 ℃ and the pH value of 5-7 into nano titanium dioxide powder to form a titanium dioxide solution;
adding a silane coupling agent into the titanium dioxide solution, and uniformly stirring to form a hydrophilic oleophilic nano titanium dioxide solution, namely a solution A;
and step three, adding the solution A into asphalt at the temperature of 110-130 ℃, simultaneously adding aluminum salt, stirring in a low-speed stirrer for 5-10 min to finally generate nano titanium dioxide modified emulsified asphalt, cooling to below 50 ℃, and storing at normal temperature.
Compared with the prior art, the invention has the following technical effects:
the invention firstly uses silane coupling agent to modify nano titanium dioxide to form oleophilic nano titanium dioxide, and uses the oleophilic nano titanium dioxide as emulsifier. The modified emulsified asphalt has the characteristics of long storage time, good dispersibility, timely demulsification in road engineering, good adhesion between the asphalt and mineral aggregate, improvement on the manufacturing process and the like.
And (II) the nano titanium dioxide modified emulsified asphalt prepared by the invention improves the preparation process of the emulsified asphalt. Because the emulsifier of the traditional modified emulsified asphalt is a high molecular material, the emulsifier and the asphalt can be uniformly mixed only by high-speed shearing when the emulsified asphalt is prepared, and the emulsifier and the asphalt can be uniformly mixed only by low-speed shearing of the nano titanium dioxide modified emulsified asphalt prepared by the invention.
The nano titanium dioxide modified emulsified asphalt prepared by the invention firstly uses silane coupling agent to modify nano titanium dioxide to form oleophilic nano titanium dioxide, and uses the hydrophilic oleophilic nano titanium dioxide as emulsifier, so that no or little foam is generated in the preparation process.
(IV) the nano titanium dioxide modified emulsified asphalt prepared by the invention has very small particle size of nano materials and very high surface energy, so that the surface has very strong electric charge, and opposite electric charges can be adsorbed to form an electric double layer, thereby being beneficial to the stability of a dispersion system and leading the storage of the emulsified asphalt to be more stable; meanwhile, when the auxiliary agent aluminum salt is added, the surface of the nano titanium dioxide is positively charged and is easily combined with negatively charged mineral aggregate, so that the asphalt is not easy to peel off from the mineral aggregate.
And (V) the nano titanium dioxide modified emulsified asphalt prepared by the invention is not easy to demulsify during storage due to super-hydrophilicity of the surface of the nano titanium dioxide, has good engineering performance and economic benefit, and is suitable for popularization.
(VI) the nano modified emulsified asphalt prepared by the invention can reflect and scatter ultraviolet rays and absorb ultraviolet rays due to small particle size and high activity of the nano titanium dioxide, so that the nano modified emulsified asphalt has stronger blocking capability on the ultraviolet rays, and the performances of asphalt mixtures such as ageing resistance and high-temperature stability are greatly improved.
And (VII) the nano titanium dioxide modified emulsified asphalt prepared by the invention reduces the photocatalysis capacity of the black asphalt because the nano titanium dioxide is wrapped in the black asphalt, and the addition of the aluminum ions can improve the catalysis capacity of the titanium dioxide and decompose organic pollutants, so that the automobile exhaust can be effectively degraded and the environment can be protected.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention.
Example 1:
the preparation is prepared from the following raw materials in parts by weight: 65 parts of asphalt, 4 parts of nano titanium dioxide, 3 parts of a silane coupling agent, 2 parts of aluminum salt, 2 parts of a stabilizer and 24 parts of water.
Wherein, the asphalt is the base asphalt, and in this example, 90# Clarity base asphalt is selected.
The nano titanium dioxide is hydrophilic anatase type nano titanium dioxide.
The silane coupling agent is gamma-methacryloxypropyl trimethoxy silane.
The stabilizer is polyvinyl alcohol, and the number average molecular weight of the polyvinyl alcohol is 72600-81400.
The aluminum salt is aluminum chloride.
The preparation method of the nano titanium dioxide modified emulsified asphalt of the embodiment is carried out according to the following steps:
step one, adding water with the temperature of 60-80 ℃ and the pH value of 5-7 into nano titanium dioxide powder to form a titanium dioxide solution;
adding a silane coupling agent into the titanium dioxide solution, and uniformly stirring to form a hydrophilic oleophilic nano titanium dioxide solution, namely a solution A;
and step three, adding the solution A into asphalt at the temperature of 110-130 ℃, simultaneously adding aluminum salt, stirring for 5-10 min in a low-speed stirrer to finally generate nano titanium dioxide modified emulsified asphalt, quickly cooling to below 50 ℃, and storing at normal temperature.
And (3) performance testing:
(a) observing the quantity of foams generated by the prepared nano titanium dioxide modified emulsified asphalt;
(b) observing whether the nano titanium dioxide modified emulsified asphalt stored for 5 days at normal temperature has demulsification or layering phenomenon;
(c) sampling on the pavement paved with the nano titanium dioxide modified emulsified asphalt to observe the stripping condition of the asphalt;
(d) and testing the ageing resistance and the high-temperature stability of the pavement paved with the nano titanium dioxide modified emulsified asphalt.
The performance tests are shown in table 1.
Example 2:
the preparation is prepared from the following raw materials in parts by weight: 65 parts of asphalt, 4 parts of nano titanium dioxide, 4 parts of a silane coupling agent, 2 parts of aluminum salt, 1 part of a stabilizer and 24 parts of water.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the nano titanium dioxide modified emulsified asphalt of the embodiment is the same as that of the embodiment 1.
The performance test items of this example were the same as those of example 1, and the performance test results are shown in table 1.
Example 3:
the preparation is prepared from the following raw materials in parts by weight: 64 parts of asphalt, 5 parts of nano titanium dioxide, 3 parts of silane coupling agent, 3 parts of aluminum salt, 1 part of stabilizer and 24 parts of water.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the nano titanium dioxide modified emulsified asphalt of the embodiment is the same as that of the embodiment 1.
The performance test items of this example were the same as those of example 1, and the performance test results are shown in table 1.
Example 4:
the preparation is prepared from the following raw materials in parts by weight: 64 parts of asphalt, 5 parts of nano titanium dioxide, 4 parts of silane coupling agent, 3 parts of aluminum salt, 1 part of stabilizer and 23 parts of water.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the nano titanium dioxide modified emulsified asphalt of the embodiment is the same as that of the embodiment 1.
The performance test items of this example were the same as those of example 1, and the performance test results are shown in table 1.
Example 5:
the preparation is prepared from the following raw materials in parts by weight: 63 parts of asphalt, 6 parts of nano titanium dioxide, 3 parts of a silane coupling agent, 2 parts of aluminum salt, 2 parts of a stabilizer and 24 parts of water.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the nano titanium dioxide modified emulsified asphalt of the embodiment is the same as that of the embodiment 1.
The performance test items of this example were the same as those of example 1, and the performance test results are shown in table 1.
Example 6:
the preparation is prepared from the following raw materials in parts by weight: 63 parts of asphalt, 6 parts of nano titanium dioxide, 4 parts of silane coupling agent, 2 parts of aluminum salt, 1 part of stabilizer and 24 parts of water.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the nano titanium dioxide modified emulsified asphalt of the embodiment is the same as that of the embodiment 1.
The performance test items of this example were the same as those of example 1, and the performance test results are shown in table 1.
Comparative example 1:
the comparative example shows SBS modified emulsified asphalt, which is different from the comparative example 6 in that anatase type nano titanium dioxide and a silane coupling agent are respectively replaced by a cationic emulsifier (specifically quaternary ammonium salt) and an SBR latex modifier, and the proportion of raw materials is the same as that of the comparative example 6 in parts by weight.
The specifications of the asphalt, the stabilizer, the aluminum salt and the water used in the comparative example were the same as those of example 1.
The quaternary ammonium salt used in this comparative example was a mixture of dodecyl dimethyl benzyl ammonium chloride and alkyl dimethyl benzyl quaternary ammonium salt in a 1:1 ratio.
The modified emulsified asphalt of this comparative example was prepared in substantially the same manner as in example 1.
The performance test items of this example were the same as those of example 1, and the performance test results are shown in table 1.
Comparative example 2:
the comparative example shows SBS modified emulsified asphalt, which is different from the comparative example 6 in that anatase type nano titanium dioxide and a silane coupling agent are respectively replaced by a nonionic emulsifier (specifically polyol) and an SBR latex modifier, and the proportion of raw materials is the same as that of the comparative example 6 in parts by weight.
The specifications of the asphalt, the stabilizer, the aluminum salt and the water used in the comparative example were the same as those of example 1.
The polyol used in this comparative example was a blend of trimethylolethane and pentaerythritol in a 1:1 weight ratio.
The modified emulsified asphalt of this comparative example was prepared in substantially the same manner as in comparative example 1.
The performance test items of this example were the same as those of example 1, and the performance test results are shown in table 1.
Table 1 results of performance testing
Analysis of table 1 can yield:
(A) compared with SBS modified emulsified asphalt, the nanometer titanium dioxide modified emulsified asphalt has little foam generation in the manufacturing process;
(B) compared with SBS modified emulsified asphalt, the nanometer titanium dioxide modified emulsified asphalt has better storage stability, because the nanometer material has very small granularity and very high surface energy, the surface has very strong electric charge, and can adsorb opposite electric charges to form a double electric layer, which is beneficial to the stability of a dispersion system and enables the emulsified asphalt to be stored more stably;
(C) compared with SBS modified emulsified asphalt, the nanometer titania modified emulsified asphalt has increased adhesion to mineral aggregate, and the liquid nanometer titania has surface charge, so that the nanometer titania has positive charge and is easy to combine with negatively charged mineral aggregate. Therefore, the coating area of the coating layer and the mineral aggregate is large, and the adhesion is good.
(D) Compared with SBS modified emulsified asphalt, the nanometer titanium dioxide modified emulsified asphalt has reduced penetration, raised softening point and increased ductility, and this shows that the modified emulsified asphalt has raised ageing resistance, high temperature stability and low temperature crack resistance.
(E) Compared with the indexes of the test pieces in the embodiments 1 to 6, the indexes in the embodiment 4 are found to be optimal.
Claims (2)
1. The nano titanium dioxide modified emulsified asphalt is characterized by being prepared from the following raw materials in parts by weight: 64 parts of asphalt, 5 parts of nano titanium dioxide, 4 parts of silane coupling agent, 3 parts of aluminum salt, 1 part of stabilizer and 23 parts of water;
the asphalt is matrix asphalt; the nano titanium dioxide is hydrophilic anatase type nano titanium dioxide; the stabilizer is polyvinyl alcohol; the aluminum salt is aluminum chloride;
the preparation method of the nano titanium dioxide modified emulsified asphalt comprises the following steps:
step one, adding water with the temperature of 60-80 ℃ and the pH value of 5-7 into nano titanium dioxide powder to form a titanium dioxide solution;
adding a silane coupling agent into the titanium dioxide solution, and uniformly stirring to form a hydrophilic oleophilic nano titanium dioxide solution, namely a solution A;
and step three, adding the solution A into asphalt at the temperature of 110-130 ℃, simultaneously adding aluminum salt, stirring in a low-speed stirrer for 5-10 min to finally generate nano titanium dioxide modified emulsified asphalt, cooling to below 50 ℃, and storing at normal temperature.
2. The preparation method of the nano titanium dioxide modified emulsified asphalt as claimed in claim 1, which is characterized by comprising the following steps:
step one, adding water with the temperature of 60-80 ℃ and the pH value of 5-7 into nano titanium dioxide powder to form a titanium dioxide solution;
adding a silane coupling agent into the titanium dioxide solution, and uniformly stirring to form a hydrophilic oleophilic nano titanium dioxide solution, namely a solution A;
and step three, adding the solution A into asphalt at the temperature of 110-130 ℃, simultaneously adding aluminum salt, stirring in a low-speed stirrer for 5-10 min to finally generate nano titanium dioxide modified emulsified asphalt, cooling to below 50 ℃, and storing at normal temperature.
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| CN109486219B (en) * | 2018-10-30 | 2021-04-30 | 湖北津泰环保科技有限公司 | Organic-coated nano titanium dioxide grafted SBS (styrene butadiene styrene) modified asphalt and preparation method thereof |
| CN109504108A (en) * | 2018-11-21 | 2019-03-22 | 魏林涛 | A kind of weather-proof modified pitch |
| CN111592770A (en) * | 2020-04-21 | 2020-08-28 | 同济大学 | Emulsified asphalt and preparation method thereof |
| CN112321214A (en) * | 2020-11-11 | 2021-02-05 | 东北林业大学 | Use of straw fiber for regenerating asphalt concrete pavement |
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| CN101143967A (en) * | 2006-09-14 | 2008-03-19 | 湖南大学 | Inorganic nano particle and polymer composite modified emulsified asphalt |
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| JPH0625536A (en) * | 1991-05-27 | 1994-02-01 | Kowa Kagaku Kogyo Kk | Production of new asphalt emulsion |
| US6245850B1 (en) * | 1997-04-10 | 2001-06-12 | John R. Fields | Reflective asphalt emulsions and method |
| KR20080095453A (en) * | 2007-04-24 | 2008-10-29 | 이승진 | Exposure rubber asphalt waterproofing material composition of water soluble anionic type and construction method thereof |
| KR101668619B1 (en) * | 2015-12-14 | 2016-10-25 | 주식회사 신선 | Recycled cold asphalt concrete mixture and road paving method using the same |
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| CN101143967A (en) * | 2006-09-14 | 2008-03-19 | 湖南大学 | Inorganic nano particle and polymer composite modified emulsified asphalt |
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| 纳米二氧化硅的表面疏水化改性及其乳化作用研究进展;燕永利 等;《日用化学工业》;20130630;第43卷(第3期);第224-230页 * |
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