CN110591394B - Modified emulsified asphalt for micro surfacing - Google Patents
Modified emulsified asphalt for micro surfacing Download PDFInfo
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- CN110591394B CN110591394B CN201910763317.3A CN201910763317A CN110591394B CN 110591394 B CN110591394 B CN 110591394B CN 201910763317 A CN201910763317 A CN 201910763317A CN 110591394 B CN110591394 B CN 110591394B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2395/00—Bituminous materials, e.g. asphalt, tar or pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention discloses modified emulsified asphalt for micro surfacing, which comprises the following materials in parts by weight: 55-60 parts of asphalt; 5-7 parts of poly-1-butene; 12-14 parts by weight of a basic emulsifier; 8-10 parts of a co-emulsifier; 0.5-2 parts by weight of a stabilizer; 30-40 parts of water. The modified emulsified asphalt for micro-surfacing of the invention improves the internal structure of the emulsified asphalt in a micro degree by optimizing the chemical components thereof, and has excellent storage stability and good adhesiveness with stone materials.
Description
Technical Field
The invention relates to a pavement material, in particular to modified emulsified asphalt for micro surfacing.
Background
With the construction and the service life of the expressway in China being prolonged, the maintenance work of the expressway has become the key work of the highway department in China. The modified emulsified asphalt is an emulsified asphalt product added with rubber latex high molecular polymers, absorbs the characteristics of rubber asphalt materials, retains the advantages of the emulsified asphalt, improves the weather resistance, the elasticity, the cohesiveness, the toughness and the anti-aging property of the emulsified asphalt, and simultaneously can improve the high-temperature stability, the low-temperature crack resistance, the cohesion, the adhesiveness, the anti-stripping capability, the early strength and the waterproof performance of micro-surfacing, thereby prolonging the service life of the emulsified asphalt. The modified emulsified asphalt can be widely applied to paving and daily maintenance engineering of high-grade roads, particularly, a modified emulsified asphalt product must be used in a micro-surfacing treatment process for pavement maintenance, and the success or failure of the micro-surfacing technology can be directly influenced by the advantages and disadvantages of the technical performance of the modified emulsified asphalt.
Written by Zhang German service and the like and introduced in the book "production and application of petroleum asphalt" published by the Chinese petrochemical publishing company, at present, the types of domestic modified emulsified asphalt are various, and three preparation methods of the modified emulsified asphalt exist. The first method is called a double hot mixing method, i.e., the rubber latex is subjected to two hot mixing dispersion processes. The second method is called a primary hot mixing method, i.e., the rubber latex and the asphalt emulsion are subjected to a primary hot mixing dispersion process. The third method is called a primary cold mixing method, namely, the rubber latex and the asphalt emulsion are subjected to a primary cold mixing and dispersing process. These methods all have the defects of unstable emulsion, poor performance of the emulsifier and the like.
Disclosure of Invention
In view of the above-mentioned disadvantages, the present invention is directed to developing a modified emulsified asphalt for micro surfacing, which has excellent storage stability and good adhesiveness to stone.
The technical scheme of the invention is summarized as follows:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
preferably, the modified emulsified asphalt for micro-surfacing is one selected from No. 70 heavy traffic asphalt, No. 90 heavy traffic asphalt, No. 100 common road asphalt, No. 10 construction asphalt or coal-based asphalt.
Preferably, the modified emulsified asphalt for micro-surfacing is characterized in that the softening point of the asphalt is 50-70 ℃, and the penetration degree of the asphalt is 50-1001/10 mm.
Preferably, the modified emulsified asphalt for micro-surfacing comprises 24-28 wt% of N, N-dimethyl octadecanoic amine hydrochloride, 30-40 wt% of cetyl pyridine bromide and 35-40 wt% of dihydroxyethyl oleate imidazoline.
Preferably, the modified emulsified asphalt for micro-surfacing comprises 50-54 wt% of fatty acid polyoxyethylene ester and 46-50 wt% of polyethylene glycol distearate.
Preferably, the modified emulsified asphalt for micro-surfacing comprises 30-40 wt% of polyvinyl alcohol and 60-70 wt% of sodium citrate.
Preferably, the modified emulsified asphalt for micro-surfacing further comprises 0.005-0.01 part by weight of diisooctyl sebacate.
Preferably, the modified emulsified asphalt for micro-surfacing further comprises 1-2 parts by weight of styrene-isoprene-styrene.
Preferably, the modified emulsified asphalt for micro surfacing further comprises 0.1-0.5 part by weight of butyronitrile latex.
Preferably, the modified emulsified asphalt for micro-surfacing is characterized in that the number average molecular weight of the styrene-isoprene-styrene is 4000 to 6000.
The invention has the beneficial effects that:
(1) the modified emulsified asphalt for micro-surfacing of the invention improves the internal structure of the emulsified asphalt in a micro degree by optimizing the chemical components thereof, and has excellent storage stability and good adhesiveness with stone materials.
(2) According to the invention, the poly-1-butene is added to improve the fusion degree between the interfaces of the rubber particles after demulsification, so that a rubber network structure is formed, the high-temperature and low-temperature performances of the modified emulsified asphalt are improved, and the adhesion with coarse aggregates is improved; n, N-dimethyl octadecylamine hydrochloride, cetyl pyridine bromide and dihydroxyethyl oleic acid radical imidazoline are used as an emulsifier, so that the compatibility of the emulsifier and asphalt is improved, the emulsification effect is improved, and the product performance is stable; the synergistic effect of the polyvinyl alcohol and the sodium citrate improves the stability of the emulsified asphalt; the diisooctyl sebacate is added into the asphalt and the poly-1-butene, so that the attraction among polymer molecular chains is weakened, the mobility and the flexibility of the molecular chains are improved, the compatibility with the asphalt is good, and the thermal stability of the emulsified asphalt can be improved; the styrene-isoprene-styrene has high-temperature toughness, and is added into the asphalt to increase the strength of a rubber network, so that the toughness and the toughness of the modified asphalt can be obviously enhanced.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
The scheme provides modified emulsified asphalt for micro surfacing, which comprises the following materials in parts by weight:
the asphalt is a black-brown complex mixture composed of hydrocarbons with different molecular weights and nonmetal derivatives thereof, is one of high-viscosity organic liquids, is in a liquid state, has a black surface, and is soluble in carbon disulfide. Asphalt is a waterproof, moistureproof and anticorrosive organic cementing material. The poly-1-butylene is added to improve the fusion degree between colloidal particle interfaces after demulsification, so that a rubber network structure is formed, the high-temperature and low-temperature performances of the modified emulsified asphalt are improved, and the adhesion with coarse aggregates is improved.
As another embodiment of the present disclosure, the asphalt is selected from one of No. 70 heavy traffic asphalt, No. 90 heavy traffic asphalt, No. 100 common road asphalt, No. 10 construction asphalt, or coal-based asphalt.
As another embodiment of the present invention, the asphalt has a softening point of 50 to 70 ℃ and a penetration of 50 to 1001/10 mm.
As another embodiment of the present invention, the base emulsifier comprises 24-28 wt% of N, N-dimethyloctadecylamine hydrochloride, 30-40 wt% of cetylpyridinium bromide and 35-40 wt% of dihydroxyethyl oleate imidazoline. N, N-dimethyl octadecylamine hydrochloride, cetyl pyridine bromide and dihydroxyethyl oleic acid radical imidazoline are used as an emulsifier, so that the compatibility of the emulsifier and asphalt is improved, the emulsification effect is improved, and the product performance is stable.
As another embodiment of the present disclosure, the co-emulsifier comprises 50-54 wt% of polyoxyethylene fatty acid ester and 46-50 wt% of polyethylene glycol distearate. The dispersing performance and the emulsifying performance of the product are further improved by the fatty acid polyoxyethylene ester and the polyethylene glycol distearate.
As another embodiment of the present disclosure, the stabilizer comprises 30 to 40 wt% of polyvinyl alcohol and 60 to 70 wt% of sodium citrate. The synergistic effect of polyvinyl alcohol and sodium citrate improves the stability of the emulsified asphalt.
As another embodiment of the present invention, the paint further comprises 0.005 to 0.01 weight part of diisooctyl sebacate. The diisooctyl sebacate is added into the asphalt and the poly-1-butene, so that the attraction among polymer molecular chains is weakened, the mobility and the flexibility of the molecular chains are improved, the compatibility with the asphalt is good, and the thermal stability of the emulsified asphalt can be improved.
As another embodiment of the present disclosure, the composition further comprises 1 to 2 parts by weight of styrene-isoprene-styrene. The styrene-isoprene-styrene has high-temperature toughness, and is added into the asphalt to increase the strength of a rubber network, so that the toughness and the toughness of the modified asphalt can be obviously enhanced.
As another embodiment of the present disclosure, the adhesive further comprises 0.1 to 0.5 parts by weight of a nitrile latex. The butyronitrile latex and the styrene-isoprene-styrene generate cross-linking reaction under the action of a cross-linking agent and generate grafting reaction with the asphalt, the formed network structure wraps the asphalt and the filler dispersed in the emulsified asphalt, the adhesiveness with stone is improved, the micro-surfacing seal material is prevented from generating phase separation, segregation and delamination are not generated after storage at high temperature, and the excellent tensile, fracture-resistant and heat-resistant waterproof performances of the pavement material are provided.
In another embodiment of the present disclosure, the number average molecular weight of the styrene-isoprene-styrene is 4000 to 6000. The molecular weight of the polymer plays an important role in the performance of the polymer, and polymers with different molecular weights have completely different mechanical and chemical properties. The number average molecular weight of styrene-isoprene-styrene used in the scheme is limited, if the number average molecular weight is less than 4000, the viscosity of a system is reduced, the machining performance of a polymer is greatly reduced, asphalt shows a soft characteristic, and although the flexibility is good, when the asphalt is used for micro-surfacing, the firmness and the waterproofness of the asphalt cannot meet the requirements; if the number average molecular weight is more than 6000g/mol, the viscosity of the system is increased, the mechanical property of the polymer is increased, but the turbidity of the system is also increased correspondingly, so that the toughness of the asphalt is reduced, and the stress buffering and cracking delaying performance of the cement stabilized base layer are reduced.
Specific examples and comparative examples are listed below:
example 1:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 70 heavy traffic asphalt; the base emulsifier comprises 24 wt% of N, N-dimethyloctadecylamine hydrochloride, 30 wt% of cetylpyridinium bromide and 36 wt% of dihydroxyethyl oleate imidazoline; the auxiliary emulsifier comprises 50 wt% of polyoxyethylene fatty acid ester and 50 wt% of polyethylene glycol distearate; the stabilizer comprises 30 wt% of polyvinyl alcohol and 70 wt% of sodium citrate; the number average molecular weight of styrene-isoprene-styrene was 4000.
Example 2:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 90 heavy traffic asphalt; the base emulsifier comprises 26 wt% of N, N-dimethyloctadecylamine hydrochloride, 38 wt% of cetylpyridinium bromide and 36 wt% of dihydroxyethyl oleate imidazoline; the coemulsifier comprises 53 wt% of polyoxyethylene fatty acid ester and 47 wt% of polyethylene glycol distearate; the stabilizer comprises 35 wt% of polyvinyl alcohol and 65 wt% of sodium citrate; the number average molecular weight of styrene-isoprene-styrene was 5000.
Example 3:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 100 common road asphalt; the base emulsifier comprises 28 wt% of N, N-dimethyloctadecylamine hydrochloride, 37 wt% of cetylpyridinium bromide and 35 wt% of dihydroxyethyl oleate imidazoline; the auxiliary emulsifier comprises 54 wt% of polyoxyethylene fatty acid ester and 46 wt% of polyethylene glycol distearate; the stabilizer comprises 40 wt% of polyvinyl alcohol and 60 wt% of sodium citrate; the number average molecular weight of styrene-isoprene-styrene was 6000.
Comparative example 1:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 70 heavy traffic asphalt; the base emulsifier comprises 24 wt% of N, N-dimethyloctadecylamine hydrochloride, 30 wt% of cetylpyridinium bromide and 36 wt% of dihydroxyethyl oleate imidazoline; the auxiliary emulsifier comprises 50 wt% of polyoxyethylene fatty acid ester and 50 wt% of polyethylene glycol distearate; the stabilizer comprises 30 wt% of polyvinyl alcohol and 70 wt% of sodium citrate; the number average molecular weight of styrene-isoprene-styrene was 4000.
Comparative example 2:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 70 heavy traffic asphalt; the base emulsifier comprises 24 wt% N, N-dimethyloctadecylamine hydrochloride, 76 wt% cetylpyridinium bromide; the auxiliary emulsifier comprises 50 wt% of polyoxyethylene fatty acid ester and 50 wt% of polyethylene glycol distearate; the stabilizer comprises 30 wt% of polyvinyl alcohol and 70 wt% of sodium citrate; the number average molecular weight of styrene-isoprene-styrene was 4000.
Comparative example 3:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 90 heavy traffic asphalt; the base emulsifier comprises 26 wt% of N, N-dimethyloctadecylamine hydrochloride, 38 wt% of cetylpyridinium bromide and 36 wt% of dihydroxyethyl oleate imidazoline; the auxiliary emulsifier is polyoxyethylene fatty acid ester; the stabilizer comprises 35 wt% of polyvinyl alcohol and 65 wt% of sodium citrate; the number average molecular weight of styrene-isoprene-styrene was 5000.
Comparative example 4:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 90 heavy traffic asphalt; the base emulsifier comprises 26 wt% of N, N-dimethyloctadecylamine hydrochloride, 38 wt% of cetylpyridinium bromide and 36 wt% of dihydroxyethyl oleate imidazoline; the coemulsifier comprises 53 wt% of polyoxyethylene fatty acid ester and 47 wt% of polyethylene glycol distearate; the stabilizer is polyvinyl alcohol; the number average molecular weight of styrene-isoprene-styrene was 5000.
Comparative example 5:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 100 common road asphalt; the base emulsifier comprises 28 wt% of N, N-dimethyloctadecylamine hydrochloride, 37 wt% of cetylpyridinium bromide and 35 wt% of dihydroxyethyl oleate imidazoline; the auxiliary emulsifier comprises 54 wt% of polyoxyethylene fatty acid ester and 46 wt% of polyethylene glycol distearate; the stabilizer comprises 40 wt% of polyvinyl alcohol and 60 wt% of sodium citrate.
Comparative example 6:
the modified emulsified asphalt for micro surfacing comprises the following materials in parts by weight:
the asphalt is No. 100 common road asphalt; the base emulsifier comprises 28 wt% of N, N-dimethyloctadecylamine hydrochloride, 37 wt% of cetylpyridinium bromide and 35 wt% of dihydroxyethyl oleate imidazoline; the auxiliary emulsifier comprises 54 wt% of polyoxyethylene fatty acid ester and 46 wt% of polyethylene glycol distearate; the stabilizer comprises 40 wt% of polyvinyl alcohol and 60 wt% of sodium citrate; the number average molecular weight of styrene-isoprene-styrene was 6000.
The results of the performance tests of the examples and comparative examples are set forth below:
as can be seen from the above examples, the material obtained not only has excellent storage stability but also good adhesion to stone.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (3)
1. The modified emulsified asphalt for micro surfacing is characterized by comprising the following materials in parts by weight:
0.005-0.01 parts by weight of diisooctyl sebacate;
1-2 parts by weight of styrene-isoprene-styrene;
0.1-0.5 parts by weight of butyronitrile latex;
the basic emulsifier comprises 24-28 wt% of N, N-dimethyl octadecylamine hydrochloride, 30-40 wt% of cetyl pyridine bromide and 35-40 wt% of dihydroxyethyl oleic imidazoline;
the auxiliary emulsifier comprises 50-54 wt% of polyoxyethylene fatty acid ester and 46-50 wt% of polyethylene glycol distearate;
the stabilizer comprises 30-40 wt% of polyvinyl alcohol and 60-70 wt% of sodium citrate;
the number average molecular weight of the styrene-isoprene-styrene is 4000-6000.
2. The modified emulsified asphalt for micro-surfacing according to claim 1, wherein the asphalt is selected from one of No. 70 heavy traffic asphalt, No. 90 heavy traffic asphalt, No. 100 general road asphalt, No. 10 construction asphalt or coal-based asphalt.
3. The modified emulsified asphalt for micro-surfacing according to claim 2, wherein the asphalt has a softening point of 50 to 70 ℃ and a penetration of 50 to 1001/10 mm.
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