CN108250777B

CN108250777B - Colored asphalt and preparation method thereof

Info

Publication number: CN108250777B
Application number: CN201810030010.8A
Authority: CN
Inventors: 张永翰; 马韵升; 陈梅梅; 祁聪; 时国靖; 牛海波; 钟景瑞
Original assignee: Chambroad Chemical Industry Research Institute Co Ltd
Current assignee: Jingbo Hainan New Materials Co ltd; Shandong Haiyun Asphalt Co ltd; Shandong Chambroad Petrochemicals Co Ltd
Priority date: 2018-01-12
Filing date: 2018-01-12
Publication date: 2020-06-05
Anticipated expiration: 2038-01-12
Also published as: CN108250777A

Abstract

The invention provides colored asphalt which is prepared from the following raw materials: 20-50 parts by weight of petroleum resin; 5-20 parts by weight of a thermoplastic resin; 1-10 parts by weight of a rubber asphalt modifier; 20-66 parts of aromatic oil; 5-35 parts of color dye. Compared with the prior art, the rubber asphalt modifier, the thermoplastic resin and the aromatic oil are added in the preparation of the color asphalt, the rubber asphalt modifier is utilized to improve the low-temperature performance of the color asphalt, the thermoplastic resin enables the color asphalt to have better high-temperature performance and higher softening point, the high strength, high resilience and good impact resistance of the thermoplastic resin can improve the tear strength, fatigue resistance and wear resistance of the color asphalt, and the aromatic oil is utilized to promote the swelling of the polymer in the system to increase the stability of the system and reduce the segregation.

Description

Colored asphalt and preparation method thereof

Technical Field

The invention belongs to the technical field of road materials, and particularly relates to colored asphalt and a preparation method thereof.

Background

As a decorative and functional pavement material, the colored asphalt is increasingly utilized in urban construction, so that the living environment of people is beautified, and the connotation of a city is improved. The preparation of colored asphalt generally comprises the following two methods: the first method is also a more conventional method, which is to adopt petroleum resin, a modifier and aromatic oil to prepare a light-color cementing material, and add pigment and mineral aggregate to prepare a color asphalt mixture during mixing, wherein the color asphalt prepared by the method needs to be transported by a special tank truck, and the energy consumption and the transportation cost are higher; the second method is to add dye, filler and various assistants into the light color cementing material to produce color asphalt cementing material or color asphalt granule.

Chinese patent publication No. CN102952405A discloses a method for preparing solid colored asphalt particles, which uses C5 and C9 petroleum resins, SBS, SBR and solid rosin as raw materials, and the prepared colored asphalt cement has high viscosity, but harsh preparation conditions and high cost; chinese patent publication No. CN101928465A discloses a color asphalt cement which can be directly used in a dispensing process and a preparation method thereof, the method mainly achieves the technical index of asphalt for construction by adjusting the mixture ratio of petroleum resin, aromatic oil and SBS, the preparation method adopts high content of SBS, the cost is higher, and the preparation process requires higher shearing speed and longer shearing time.

Disclosure of Invention

In view of the above, the technical problem to be solved by the present invention is to provide a colored asphalt and a preparation method thereof, wherein the colored asphalt has a low cost and a high softening point.

The invention provides colored asphalt which is prepared from the following raw materials:

preferably, the petroleum resin is a C5 petroleum resin; the molecular weight of the petroleum resin is 1000-2500; the softening point of the petroleum resin is 90-140 ℃.

Preferably, the thermoplastic resin is selected from one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, ethylene-vinyl acetate copolymer and polymethyl methacrylate.

Preferably, the thermoplastic resin is waste plastic particles; the content of aromatic hydrocarbon in the aromatic oil is more than or equal to 75 percent.

Preferably, the rubber asphalt modifier is an SBR modifier; the molecular weight of the rubber asphalt modifier is 150000-300000.

Preferably, the coating also comprises 0.5-10 parts by weight of talcum powder; the talcum powder is 2000 mesh and/or above 2000 mesh superfine talcum powder.

Preferably, the paint also comprises 0.1-1 part by weight of a coupling agent, wherein the coupling agent is selected from one or more of vinyl triethoxysilane, vinyl trimethoxysilane, 3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane and N- (β -aminoethyl) -gamma-aminopropyltriethoxysilane.

Preferably, the coating also comprises 0.05-1 part by weight of a plasticizer; the plasticizer is dioctyl phthalate;

0.05-2 parts by weight of antioxidant is also included; the antioxidant is selected from hindered phenol antioxidants.

The invention also provides a preparation method of the colored asphalt, which comprises the following steps:

s1) heating aromatic oil, and then shearing and mixing the aromatic oil and the rubber asphalt modifier at a high speed to obtain a mixture A;

s2) shearing and dissolving the mixture A, the petroleum resin and the thermoplastic resin at a high speed to obtain a mixture B;

s3) mixing the mixture B with a color dye to obtain the color asphalt.

Preferably, the temperature of the high-speed shearing in the step S1) is 150-180 ℃; the high-speed shearing time is 10-30 min; the high-speed shearing rate is 3000-5000 r/min;

the temperature of high-speed shearing in the step S2) is 170-200 ℃; the high-speed shearing time is 30-120 min; the high-speed shearing rate is 3000-5000 r/min;

the development temperature in the step S3) is 140-160 ℃; the development time is 10-30 min.

Drawings

FIG. 1 is a schematic view of a process for preparing a colored asphalt according to the present invention;

FIG. 2 is a photograph of a Marshall specimen molded in example 1 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

in the present invention, the sources of all raw materials are not particularly limited, and they may be commercially available.

The petroleum resin is not particularly limited as long as it is well known to those skilled in the art, and in the present invention, C5 petroleum resin is preferable; the molecular weight of the petroleum resin is preferably 1000-2500; the softening point of the petroleum resin is preferably 90-140 ℃; the content of the petroleum resin is preferably 20 to 40 parts by weight, more preferably 25 to 35 parts by weight, still more preferably 25 to 30 parts by weight, and most preferably 25.5 to 29.5 parts by weight. The petroleum resin has good tackifying property, compatibility, thermal stability and light stability, mainly plays roles of tackifying and filling in the colored asphalt, and can improve the adhesiveness with stone and adjust the penetration value of the modified asphalt.

The thermoplastic resin is a thermoplastic resin well known to those skilled in the art, and is not particularly limited, and in the present invention, one or more of Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), Polystyrene (PS), ethylene-vinyl acetate copolymer (EVA), and polymethyl methacrylate (PMMA) are preferable; the content of the thermoplastic resin is preferably 7 to 18 parts by weight, more preferably 9 to 16 parts by weight, and still more preferably 9.2 to 15.5 parts by weight; in some embodiments provided herein, the thermoplastic resin is preferably present in an amount of 9.2 parts by weight; in some embodiments provided herein, the thermoplastic resin is preferably present in an amount of 15 parts by weight; in other embodiments provided herein, the thermoplastic resin is preferably present in an amount of 15.5 parts by weight.

The thermoplastic resin modification mechanism comprises the following two aspects, one is that under the action of heat and stirring, the surface energy of a polymer is increased violently, components with similar structures in asphalt are adsorbed to reduce the surface energy, part of light components enter polymer molecules to swell so as to limit the flow of the asphalt, and meanwhile, the swelling process also changes the colloid structure in the asphalt so as to increase the content of the asphaltene, increase the high-temperature viscosity and reduce the temperature sensitivity so as to improve the mechanical property of the asphalt; secondly, the thermoplastic resin is added into hot asphalt to be heated and melted, the crystal structure is converted into an amorphous structure, molecular chains can be stretched out after the polymer macromolecules absorb light components to swell, but the polymer macromolecules can be recrystallized after cooling, and the micro-thread connection formed between the crystallized wafers can also improve the high-temperature strength of the asphalt.

The thermoplastic resin according to the present invention is preferably waste plastic pellets, more preferably recycled pellets; takes waste plastic particles as main components, is environment-friendly, cheap and easy to obtain. The main component of the waste plastic particles is a high molecular material, has high strength, high rebound resilience and good impact resistance, and can be used as a modifier in colored asphalt to obviously improve the tear resistance, the fatigue resistance and the wear resistance of a road surface.

The rubber asphalt modifier is not particularly limited as long as it is well known to those skilled in the art, and in the present invention, an SBR modifier is preferred; the molecular weight of the rubber asphalt modifier is preferably 150000-300000; the rubber-based asphalt modifier is preferably a powder and/or granules. The rubber asphalt modifier swells under the action of aromatic oil and is sheared at high speed by a shearing machine to form rubber particles with small granularity and uniform distribution. At a lower temperature, the color asphalt system with the majority of particles and resin has different modulus, can generate high stress concentration to induce a large amount of silver lines and shear zones, and consumes a large amount of energy due to the generation and development of the silver lines and the shear zones, so that the impact strength of the whole system can be improved; the larger rubber particles can limit the development of single silver lines, and destructive cracks are not formed, so that the low-temperature performance is improved. SBR is a product of random copolymerization of butadiene and styrene, can obviously improve the low-temperature performance of asphalt as a modifier, but is not obvious in improving the high-temperature performance, and can play a role in synergy and complementation when used together with waste plastics.

The content of aromatic hydrocarbon in the aromatic oil is preferably over 75 percent; the aromatic oil is not particularly limited, but is preferably a furfural extract oil and/or a highly viscous aromatic oil; the content of the aromatic oil is preferably 25 to 60 parts by weight, more preferably 25 to 50 parts by weight, still more preferably 25 to 40 parts by weight, still more preferably 25 to 35 parts by weight, and most preferably 25.5 to 32.7 parts by weight. The aromatic oil can promote the swelling of the polymer in the system, increase the distance between polymer molecules, reduce acting force, reduce friction force and enhance movement capacity, thereby increasing the stability of the system and reducing the generation of segregation.

The color dye is a color dye well known to those skilled in the art, and is not particularly limited, in the present invention, an inorganic dye is preferred, and one or more of dark dyes such as iron oxide red, chromium oxide green, and iron blue are more preferred; the content of the color dye is preferably 10 to 30 parts by weight, more preferably 15 to 30 parts by weight, still more preferably 20 to 30 parts by weight, and most preferably 20.5 to 25 parts by weight.

According to the invention, the colored asphalt preferably further comprises 0.5-10 parts by weight of talcum powder, more preferably 2-8 parts by weight, still more preferably 3-6 parts by weight, and most preferably 3.5-5.5 parts by weight; the talc powder is one known to those skilled in the art, and is not particularly limited, and in the present invention, it is preferably an ultrafine talc powder of 2000 mesh and/or more than 2000 mesh. The talcum powder is mainly used as an anti-sticking agent in the colored asphalt to prevent the particles from sticking in the storage process.

According to the invention, the color asphalt further comprises 0.1-1 part by weight of a coupling agent, more preferably 0.2-0.8 part by weight, and even more preferably 0.2-0.5 part by weight, wherein the coupling agent is a coupling agent known by persons skilled in the art, and is not particularly limited, and the coupling agent is preferably a silane coupling agent, more preferably one or more of vinyltriethoxysilane, vinyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-glycidyloxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane and N- (β -aminoethyl) -gamma-aminopropyltriethoxysilane.

According to the invention, the composition also comprises 0.05-1 part by weight of plasticizer, more preferably 0.05-0.5 part by weight; the plasticizer is not particularly limited as long as it is known to those skilled in the art, and dioctyl phthalate is preferable in the present invention.

According to the present invention, it is preferable to further include 0.05 to 2 parts by weight of an antioxidant, more preferably 0.05 to 1 part by weight, still more preferably 0.05 to 0.5 part by weight, and most preferably 0.05 to 0.2 part by weight, and the antioxidant is not particularly limited as long as it is known to those skilled in the art, and in the present invention, a hindered phenol-based antioxidant is preferable, and pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ] is more preferable.

According to the invention, the rubber asphalt modifier, the thermoplastic resin and the aromatic oil are added in the preparation of the colored asphalt, the rubber asphalt modifier is used for improving the low-temperature performance of the colored asphalt, the thermoplastic resin enables the colored asphalt to have better high-temperature performance and higher softening point, the high strength, high resilience and good impact resistance of the thermoplastic resin can improve the tear strength, fatigue resistance and wear resistance of the colored asphalt, and the aromatic oil is used for promoting the swelling of the polymer in the system to increase the stability of the system and reduce the segregation.

The color asphalt provided by the invention can be directly mixed with mineral aggregates with proper gradation and can also be used for blending common color asphalt.

The invention also provides a preparation method of the colored asphalt, which comprises the following steps: s1) heating aromatic oil, and then shearing and mixing the aromatic oil and the rubber asphalt modifier at a high speed to obtain a mixture A; s2) shearing and dissolving the mixture A, the petroleum resin and the thermoplastic resin at a high speed to obtain a mixture B; s3) mixing the mixture B with a color dye to obtain the color asphalt.

Referring to fig. 1, fig. 1 is a schematic view of a preparation process of the colored asphalt provided by the present invention.

The aromatic oil, the rubber asphalt modifier, the petroleum resin and the thermoplastic resin are the same as those described above, and are not described again here.

Heating aromatic oil, and shearing and mixing the aromatic oil and the rubber asphalt modifier at a high speed to obtain a mixture A; the high-speed shearing temperature is preferably 150-180 ℃, more preferably 160-170 ℃, and further preferably 165 ℃; the high-speed shearing time is preferably 10-30 min; the preferred speed of high-speed shearing is 3000-5000 r/min.

Shearing and dissolving the mixture A, the petroleum resin and the thermoplastic resin at a high speed to obtain a mixture B; the high-speed shearing temperature is preferably 170-200 ℃, more preferably 170-190 ℃, further preferably 170-180 ℃, and most preferably 175 ℃; the high-speed shearing time is preferably 30-120 min, more preferably 45-80 min, and further preferably 60-70 min; the high-speed shearing rate is preferably 3000-5000 r/min.

Mixing the mixture B with a color dye for development; preferably, one or more of 0.5-10 parts by weight of talcum powder, 0.1-1 part by weight of coupling agent, 0.05-1 part by weight of plasticizer and 0.05-2 parts by weight of antioxidant are also added; the talcum powder, the coupling agent, the plasticizer and the antioxidant are the same as above and are not described again; in the present invention, it is preferable to lower the temperature of the mixture B to the development temperature and add other raw materials; the development temperature is preferably 140-160 ℃, more preferably 145-155 ℃, and further preferably 150 ℃; the development time is preferably 10-60 min, and more preferably 10-30 min; the development is preferably isothermal.

After the development is finished, preferably cooling, and extruding and granulating to obtain colored asphalt; the temperature reduction is preferably to 110-130 ℃; the extrusion granulation method is a method known to those skilled in the art, and is not particularly limited, and in the present invention, extrusion granulation is preferably performed by a screw extruder, and extrusion granulation is more preferably performed by a twin-screw extruder.

The preparation method of the color asphalt provided by the invention is simple and convenient, and the development time is short; the obtained colored asphalt can be transported by plastic packaging, a special tank car is not needed, the colored asphalt can be directly put in during construction, mineral powder and dye are not needed to be added, dust generation during mixing of the mixture is avoided, and the colored asphalt can also be used as an external doping component to be blended with common colored asphalt; by adding the waste plastic particles, on one hand, the waste resources can be recycled, white pollution is reduced, and on the other hand, the use performance of the asphalt can be improved.

In order to further illustrate the present invention, the following will describe in detail a colored asphalt and a preparation method thereof provided by the present invention with reference to examples.

The reagents used in the following examples are all commercially available.

Example 1

The composition of the colored asphalt feedstock is shown in table 1.

TABLE 1 Material composition and content of colored asphalt

The preparation process of the colored asphalt comprises the following steps:

the method comprises the following steps: heating aromatic oil to 165 ℃, and then adding SBR into the mixture to shear the mixture for 30min at a high speed;

step two: increasing the temperature to 175 ℃, sequentially adding C5 petroleum resin and waste plastic particles, and shearing for 1 h;

step three: transferring into a stirrer, stirring, adding antioxidant, coupling agent, plasticizer, pulvis Talci and dye when the temperature is reduced to 150 deg.C, developing at constant temperature for 30min to obtain color asphalt master batch, cooling to about 110 deg.C, and extruding into granule with screw extruder to obtain color asphalt.

The use method of the colored asphalt comprises the following steps:

the method comprises the following steps: cleaning a mixing pot, a sample containing plate, a test mold and the like before mixing;

step two: designing the mixture mixing proportion according to the AC-10 grading type, and metering various grades of aggregates and colored asphalt;

step three: preheating the metered aggregate in an oven, adding the preheated aggregate into a mixing pot, adding the metered color asphalt into the mixing pot, controlling the temperature to be 170-200 ℃, stirring for 180s, and if the chroma is not uniform, properly prolonging the mixing time to obtain a color asphalt mixture;

step four: the mixed mixture was molded into rut specimens and marshall specimens, respectively, as shown in fig. 2, and fig. 2 is a photograph of the marshall specimens.

The prepared colored asphalt has the penetration degree of less than 50dmm and the softening point of more than 63 ℃. Carrying out pavement performance detection on the color asphalt mixture according to technical Specification for road asphalt pavement construction (JTG F40-2004) to obtain a result: the stability is more than 7KN, the dynamic stability of the track is more than 1700 times/mm, the low-temperature damage bending strain is more than 3000 mu epsilon, and other indexes all meet the technical requirements of the dense asphalt mixture.

Example 2

The composition of the colored asphalt feed is shown in table 2.

TABLE 2 Material composition and content of colored asphalt

The preparation method is the same as that of example 1, in this example, since the content of waste plastic particles is increased, the viscosity of the mixture is increased during the preparation process, and the bar extruding temperature can be appropriately increased for smooth granulation.

The prepared colored asphalt has the penetration degree lower than 35dmm and the softening point higher than 76 ℃. Mixing the prepared colored asphalt with aggregate to obtain an AC-10 mixture, forming a test piece, and detecting: the stability is more than 10KN, the dynamic stability of the track is more than 3300 times/mm, the low-temperature damage bending strain reaches 2800 mu epsilon, and other indexes all meet the technical requirements of the dense asphalt mixture.

Example 3

The composition of the colored asphalt feed is shown in table 3.

TABLE 3 Material composition and content of colored asphalt

The procedure is as in example 1, in which case the penetration of the coloured bitumen is less than 40dmm and the softening point is greater than 70 ℃. Mixing the prepared colored asphalt with aggregate to obtain an SMA-13 mixture, and detecting after a test piece is formed: the stability is more than 7KN, the dynamic stability of the track is 6300 times/mm, the low-temperature damage bending strain is more than 2800 mu epsilon, and other indexes all meet the technical requirements of densely-mixed asphalt mixtures.

Comparative example 1

The composition of the colored asphalt feed is shown in table 4.

TABLE 4 Material composition and content of colored asphalt

Material(s)	Content (parts by weight)
		C5 Petroleum resin	29.50
Furfural extract oil	32.70
		SBR (powder)	4.00
Coupling agent (KH-550)	0.50
		Antioxidant (1010)	0.05
Plasticizer (dioctyl phthalate)	0.05
		Talcum powder (2000 mesh)	3.50
Dye material	20.50

The preparation method is the same as example 1, in the comparative example, the penetration degree of the colored asphalt is more than 100dmm, and the softening point is less than 45 ℃.

Comparative example 2

The composition of the colored asphalt feed is shown in table 5.

TABLE 5 Material composition and content of colored asphalt

Material(s)	Content (parts by weight)
		C5 Petroleum resin	29.50
SBR (powder)	4.00
		Waste plastic granules (LDPE)	9.20
Coupling agent (KH-550)	0.50
		Antioxidant (1010)	0.05
Plasticizer (dioctyl phthalate)	0.05
		Talcum powder (2000 mesh)	3.50
Dye material	20.50

In this comparative example, the temperature reached 150 ℃ or higher, and C5 melted, and SBR could not be dispersed in the C5 solution, and this comparative example could not be carried out.

The comparison between the embodiment of the invention and the comparative example shows that the thermoplastic resin can enable the color asphalt to have better high-temperature performance and higher softening point, can improve the tear strength, fatigue resistance and wear resistance of the color asphalt, and utilizes the aromatic oil to promote the swelling and dispersion of the polymer in the system and increase the stability of the system.

Claims

1. The colored asphalt is characterized by being prepared from the following raw materials:

the petroleum resin is C5 petroleum resin; the molecular weight of the petroleum resin is 1000-2500; the softening point of the petroleum resin is 90-140 ℃;

the thermoplastic resin is selected from one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, ethylene-vinyl acetate copolymer and polymethyl methacrylate;

the thermoplastic resin is waste plastic particles; the content of aromatic hydrocarbon in the aromatic oil is more than or equal to 75 percent;

the rubber asphalt modifier is an SBR modifier; the molecular weight of the rubber asphalt modifier is 150000-300000;

0.5-10 parts by weight of talcum powder; the talcum powder is 2000-mesh and/or above 2000-mesh superfine talcum powder;

the adhesive also comprises 0.1-1 part by weight of a coupling agent, wherein the coupling agent is selected from one or more of vinyl triethoxysilane, vinyl trimethoxy silane, 3-aminopropyl trimethoxysilane, 3-glycidyl ether oxypropyl trimethoxysilane, gamma-methacryloxypropyl trimethoxysilane and N- (β -aminoethyl) -gamma-aminopropyl triethoxysilane;

also comprises 0.05-1 weight part of plasticizer; the plasticizer is dioctyl phthalate;

2. A method for preparing colored asphalt according to claim 1, comprising:

s3) mixing the mixture B with a color dye to obtain the color asphalt.

3. The method according to claim 2, wherein the temperature of the high-speed shearing in the step S1) is 150 to 180 ℃; the high-speed shearing time is 10-30 min; the high-speed shearing rate is 3000-5000 r/min;