CN111925662A - Polystyrene emulsion for modified emulsified asphalt and preparation method and application thereof - Google Patents
Polystyrene emulsion for modified emulsified asphalt and preparation method and application thereof Download PDFInfo
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- CN111925662A CN111925662A CN202010856653.5A CN202010856653A CN111925662A CN 111925662 A CN111925662 A CN 111925662A CN 202010856653 A CN202010856653 A CN 202010856653A CN 111925662 A CN111925662 A CN 111925662A
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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
- C08L95/005—Aqueous compositions, e.g. emulsions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F112/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F112/02—Monomers containing only one unsaturated aliphatic radical
- C08F112/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F112/06—Hydrocarbons
- C08F112/08—Styrene
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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
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The invention provides a polystyrene emulsion for modified emulsified asphalt, which is prepared from the following raw materials: 100 parts by weight of styrene; 0.2 to 5 parts by weight of polystyrene powder; 4-6 parts of emulsifier; 0.05 to 0.15 weight portion of initiator; 190-210 parts of water; the polystyrene powder is formed by grinding polystyrene or waste polystyrene products. Compared with the prior art, the polystyrene emulsion for modified emulsified asphalt provided by the invention takes waste polystyrene plastic as a raw material, and is matched with other components with specific content, so that new micelles can be prevented from being formed in the emulsification process, the formation of emulsion particles in the whole reaction process is accelerated, and the reaction rate in the whole process is improved; the polystyrene emulsion for the modified emulsified asphalt is compounded with the SBR latex, so that the emulsified asphalt has a good modification effect, the using amount of the SBR latex can be reduced to a certain extent, and the modified emulsified asphalt is more economic and efficient.
Description
Technical Field
The invention relates to the technical field of polystyrene emulsion, in particular to polystyrene emulsion for modified emulsified asphalt and a preparation method and application thereof.
Background
At present, the domestic mature emulsified asphalt modification technology mainly comprises the following steps: SBS, SBR, water-based epoxy resin, etc.; wherein, SBR has good high and low temperature characteristics, and low temperature flexibility is outstanding. Because polystyrene (PS for short) belongs to rigid molecules and has high strength in a working temperature range, and benzene rings in the molecular structure of the PS have certain compatibility with aromatic groups in asphalt, the low-temperature flexibility of SBR and the high-temperature stability of the polystyrene are synthesized, and the emulsified asphalt is modified by compounding SBR latex/polystyrene emulsion, so that the high-temperature performance of the asphalt can be obviously improved.
In addition, polystyrene plastic is one of five general-purpose plastics, is widely used for various instrument molds, models, catering packages and the like, is difficult to degrade when being discarded in the environment after being used, causes serious white pollution, and is always a hot spot concerned by people when being utilized; the current recovery methods mainly comprise direct recovery, pyrolysis and modification, and can reduce environmental pollution to different degrees.
The technical scheme for preparing the polystyrene emulsion by utilizing the recycled waste polystyrene plastic and further compounding and modifying the emulsified asphalt with the SBR latex is provided by combining the two factors, and has very important significance to the field.
Disclosure of Invention
In view of the above, the invention aims to provide a polystyrene emulsion for modified emulsified asphalt, and a preparation method and an application thereof.
The invention provides a polystyrene emulsion for modified emulsified asphalt, which is prepared from the following raw materials:
100 parts by weight of styrene;
0.2 to 5 parts by weight of polystyrene powder;
4-6 parts of emulsifier;
0.05 to 0.15 weight portion of initiator;
190-210 parts of water;
the polystyrene powder is formed by grinding polystyrene or waste polystyrene products.
Preferably, the styrene is refined monomer styrene; the purity of the refined monomer styrene is more than 99 percent.
Preferably, the polystyrene powder has a particle size of 100 to 300 mesh.
Preferably, the emulsifier is selected from one or more of disproportionated potassium rosinate, sodium dodecylbenzenesulfonate, sodium dodecylsulfonate, sodium dodecylsulfate, formaldehyde condensed naphthalenesulfonate, potassium oleate and sodium stearate.
Preferably, the initiator is selected from one or more of hydrogen peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, ammonium persulfate and potassium persulfate.
The invention also provides a preparation method of the polystyrene emulsion for the modified emulsified asphalt, which comprises the following steps:
a) mixing styrene, polystyrene powder, an emulsifier, an initiator and water, introducing inert gas for replacement, and reacting to obtain the polystyrene emulsion for the modified emulsified asphalt.
Preferably, the mixing manner in step a) is specifically as follows:
adding water, an emulsifier, an initiator and polystyrene powder into a kettle reactor, stirring to uniformly disperse the raw materials, and adding styrene to obtain a raw material mixture;
or the like, or, alternatively,
adding polystyrene powder and styrene into a kettle type reactor, stirring to ensure that the polystyrene powder is fully dissolved by the styrene, and adding a mixed solution of water, an emulsifier and an initiator to obtain a raw material mixture.
Preferably, the reaction temperature in the step a) is 45-65 ℃ and the reaction time is 4-8 h.
The invention also provides a method for modifying the emulsified asphalt, which comprises the following steps:
transforming the polystyrene emulsion to obtain transformed polystyrene emulsion; and then mixing the transformed polystyrene emulsion and SBR latex according to the mass ratio of 1: (8-12) after compounding, modifying according to the addition of 1-5 wt% of the matrix asphalt to obtain modified emulsified asphalt;
the polystyrene emulsion is the polystyrene emulsion for the modified emulsified asphalt in the technical scheme.
Preferably, the transformation process specifically comprises:
in water bath at 40-50 ℃, imidazoline emulsifier and 1831 emulsifier are mixed according to the mass ratio of 1: (2-4) mixing and uniformly stirring to obtain a transforming agent; and then taking 9 parts by weight of the transforming agent, dropwise adding the transforming agent into a kettle type reactor filled with 294.25-321.15 parts by weight of polystyrene emulsion under the condition that the rotating speed is 350-400 r/min, stirring for 5-15 min to uniformly disperse the transforming agent, and finally dropwise adding hydrochloric acid to adjust the pH value to be 2-5 to obtain the transformed polystyrene emulsion.
The invention provides a polystyrene emulsion for modified emulsified asphalt, which is prepared from the following raw materials: 100 parts by weight of styrene; 0.2 to 5 parts by weight of polystyrene powder; 4-6 parts of emulsifier; 0.05 to 0.15 weight portion of initiator; 190-210 parts of water; the polystyrene powder is formed by grinding polystyrene or waste polystyrene products. Compared with the prior art, the polystyrene emulsion for modified emulsified asphalt provided by the invention takes waste polystyrene plastic as a raw material, and is matched with other components with specific content, so that new micelles can be prevented from being formed in the emulsification process, the formation of emulsion particles in the whole reaction process is accelerated, and the reaction rate in the whole process is improved; the polystyrene emulsion for the modified emulsified asphalt is compounded with the SBR latex, so that the emulsified asphalt has a good modification effect, the using amount of the SBR latex can be reduced to a certain extent, and the modified emulsified asphalt is more economic and efficient.
In addition, the preparation method provided by the invention has the advantages of simple process, mild conditions, low raw material cost and wide application prospect.
Drawings
FIG. 1 is a kinetic curve of polystyrene emulsions provided in examples 1 to 3 of the present invention;
FIG. 2 is a kinetic curve of the polystyrene emulsions provided in examples 4 to 6 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood 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.
The invention provides a polystyrene emulsion for modified emulsified asphalt, which is prepared from the following raw materials:
100 parts by weight of styrene;
0.2 to 5 parts by weight of polystyrene powder;
4-6 parts of emulsifier;
0.05 to 0.15 weight portion of initiator;
190-210 parts of water;
the polystyrene powder is formed by grinding polystyrene or waste polystyrene products.
In the invention, the polystyrene emulsion for modified emulsified asphalt is prepared from raw materials including styrene, polystyrene powder, an emulsifier, an initiator and water, and is preferably prepared from styrene, polystyrene powder, an emulsifier, an initiator and water.
In the invention, the styrene is a reaction monomer, preferably a purified monomer styrene; the purity of the purified monomeric styrene is preferably greater than 99%. The source of the styrene is not particularly limited in the present invention, and commercially available products or self-products known to those skilled in the art may be used. In the present invention, the polystyrene emulsion for modified emulsified asphalt comprises 100 parts by weight of styrene.
In the invention, the polystyrene powder is a reaction seed and is formed by grinding polystyrene or waste polystyrene products, preferably waste polystyrene products; the invention has no special limitation on the source of the waste polystyrene product, and the recycled waste polystyrene product known by the technical personnel in the field can be adopted; therefore, the invention solves the problem of pollution caused by difficult degradation of the plastic to a certain extent by recycling the waste polystyrene plastic. In the present invention, the polystyrene powder preferably has a particle size of 100 to 300 mesh, more preferably 200 mesh. In the present invention, the polystyrene emulsion for modified emulsified asphalt comprises 0.2 to 5 parts by weight of polystyrene powder, preferably 0.5 to 2 parts by weight; accordingly, the polystyrene powder accounts for 0.2 to 5 wt%, preferably 0.5 to 2 wt% of the styrene.
In the present invention, the emulsifier is preferably selected from one or more of potassium disproportionated rosin acid, sodium dodecylbenzene sulfonate, sodium dodecylsulfonate, sodium dodecylsulfate, formaldehyde condensed naphthalene sulfonate, potassium oleate and sodium stearate, and more preferably potassium disproportionated rosin acid. The present invention is not particularly limited in terms of the source of the emulsifier, and commercially available products of the above anionic emulsifiers known to those skilled in the art may be used; thus, the present invention uses the above anionic emulsifier as an emulsifying system. In the invention, the polystyrene emulsion for modified emulsified asphalt comprises 4-6 parts by weight of emulsifier; in a preferred embodiment of the present invention, when the polystyrene powder is used in an amount of 0.5 parts by weight, the corresponding emulsifier is used in an amount of 4 parts by weight; when the amount of the polystyrene powder is 1 part by weight, the amount of the corresponding emulsifier is 5 parts by weight; when the polystyrene powder is used in an amount of 2 parts by weight, the corresponding emulsifier is used in an amount of 6 parts by weight.
In the present invention, the initiator is preferably selected from one or more of hydrogen peroxide, t-butyl hydroperoxide, cumene hydroperoxide, ammonium persulfate and potassium persulfate, and more preferably ammonium persulfate. The source of the initiator is not particularly limited in the present invention, and commercially available products of the above peroxide initiators known to those skilled in the art may be used; thus, the present invention has been made in view of the above-mentioned circumstances. In the present invention, the polystyrene emulsion for modified emulsified asphalt comprises 0.05 to 0.15 parts by weight of an initiator, preferably 0.1 part by weight.
The water is not particularly limited in the present invention, and deionized water well known to those skilled in the art may be used. In the present invention, the polystyrene emulsion for modified emulsified asphalt comprises 190 to 210 parts by weight of water, preferably 200 parts by weight.
The polystyrene emulsion for modified emulsified asphalt provided by the invention takes waste polystyrene plastic as a raw material (reaction seed) and is matched with other components with specific content, so that a new micelle can be prevented from being formed in the emulsification process, the formation of emulsion particles in the whole reaction process is accelerated, and the reaction rate in the whole process is improved; the polystyrene emulsion for the modified emulsified asphalt is compounded with the SBR latex, so that the emulsified asphalt has a good modification effect, the using amount of the SBR latex can be reduced to a certain extent, and the modified emulsified asphalt is more economic and efficient.
The invention also provides a preparation method of the polystyrene emulsion for the modified emulsified asphalt, which comprises the following steps:
a) mixing styrene, polystyrene powder, an emulsifier, an initiator and water, introducing inert gas for replacement, and reacting to obtain the polystyrene emulsion for the modified emulsified asphalt.
The invention firstly mixes the styrene, the polystyrene powder, the emulsifier, the initiator and the water. In the present invention, the styrene, the polystyrene powder, the emulsifier, the initiator and the water are the same as those described in the above technical solution, and are not described herein again.
In the present invention, the mixing manner is preferably as follows:
adding water, an emulsifier, an initiator and polystyrene powder into a kettle reactor, stirring to uniformly disperse the raw materials, and adding styrene to obtain a raw material mixture; firstly, polystyrene powder is emulsified and then added into the system;
or the like, or, alternatively,
adding polystyrene powder and styrene into a kettle-type reactor, stirring to fully dissolve the polystyrene powder by the styrene, and adding a mixed solution of water, an emulsifier and an initiator to obtain a raw material mixture; firstly, dissolving polystyrene powder by using refined styrene monomer, then adding the dissolved polystyrene powder into the system.
The tank reactor of the present invention is not particularly limited, and a polymerization tank well known to those skilled in the art may be used.
In the invention, the temperature of the stirring in the kettle type reactor is preferably 20-30 ℃, and more preferably 25 ℃; the rotating speed is preferably 350 r/min-400 r/min; the time is preferably 10min to 30 min.
After the raw material mixture is obtained, the polystyrene emulsion for the modified emulsified asphalt is obtained by introducing inert gas for replacement and then carrying out reaction. In the present invention, the inert gas is preferably nitrogen; the time for replacement by introducing an inert gas is preferably 5 to 10 min.
In the present invention, the reaction is a free radical emulsion polymerization; the reaction temperature is preferably 45-65 ℃, and more preferably 45-50 ℃; the reaction time is preferably 4 to 8 hours, and more preferably 5 hours; the pressure of the reaction is not particularly limited in the present invention, and it is sufficient to use normal pressure known to those skilled in the art. In the present invention, the temperature of the tank reactor is raised to the above reaction temperature by raising the temperature; the rate of temperature rise is preferably 0.5 ℃/min to 1.5 ℃/min, more preferably 1 ℃/min.
The preparation method of the invention can obtain the stable anionic polystyrene emulsion. The preparation method provided by the invention has the advantages of simple process, mild conditions, low raw material cost and wide application prospect.
The invention also provides a method for modifying the emulsified asphalt, which comprises the following steps:
transforming the polystyrene emulsion to obtain transformed polystyrene emulsion; and then mixing the transformed polystyrene emulsion and SBR latex according to the mass ratio of 1: (8-12) after compounding, modifying according to the addition of 1-5 wt% of the matrix asphalt to obtain modified emulsified asphalt;
the polystyrene emulsion is the polystyrene emulsion for the modified emulsified asphalt in the technical scheme.
The invention firstly transforms the polystyrene emulsion to obtain the transformed polystyrene emulsion. In the invention, the polystyrene emulsion is the polystyrene emulsion for the modified emulsified asphalt in the technical scheme; since the polystyrene emulsion for modified emulsified asphalt is anionic, it needs to be converted into cationic emulsion for matching with emulsified asphalt (cationic).
In the present invention, the transformation process is preferably specifically:
in water bath at 40-50 ℃, imidazoline emulsifier and 1831 emulsifier are mixed according to the mass ratio of 1: (2-4) mixing and uniformly stirring to obtain a transforming agent; then, 9 parts by weight of the transforming agent is taken and dripped into a kettle type reactor filled with 294.25-321.15 parts by weight of polystyrene emulsion under the condition that the rotating speed is 350-400 r/min, the stirring is carried out for 5-15 min, the polystyrene emulsion is dispersed evenly, and finally hydrochloric acid is dripped to adjust the pH value to be 2-5, so as to obtain the transformed polystyrene emulsion;
more preferably:
in a water bath at 45 ℃, an imidazoline emulsifier and a 1831 emulsifier are mixed according to a mass ratio of 1: 3, mixing and uniformly stirring to obtain a transfer agent; and then 9 parts by weight of the transforming agent is taken and dripped into a kettle type reactor filled with 304.6 parts by weight to 308.1 parts by weight of polystyrene emulsion under the condition that the rotating speed is 350r/min to 400r/min, the stirring is carried out for 10min, the polystyrene emulsion is dispersed evenly, and finally hydrochloric acid is dripped to adjust the pH value to be 3 to 4, so as to obtain the transformed polystyrene emulsion.
The invention provides a polystyrene emulsion for modified emulsified asphalt, which is prepared from the following raw materials: 100 parts by weight of styrene; 0.2 to 5 parts by weight of polystyrene powder; 4-6 parts of emulsifier; 0.05 to 0.15 weight portion of initiator; 190-210 parts of water; the polystyrene powder is formed by grinding polystyrene or waste polystyrene products. Compared with the prior art, the polystyrene emulsion for modified emulsified asphalt provided by the invention takes waste polystyrene plastic as a raw material, and is matched with other components with specific content, so that new micelles can be prevented from being formed in the emulsification process, the formation of emulsion particles in the whole reaction process is accelerated, and the reaction rate in the whole process is improved; the polystyrene emulsion for the modified emulsified asphalt is compounded with the SBR latex, so that the emulsified asphalt has a good modification effect, the using amount of the SBR latex can be reduced to a certain extent, and the modified emulsified asphalt is more economic and efficient.
In addition, the preparation method provided by the invention has the advantages of simple process, mild conditions, low raw material cost and wide application prospect.
To further illustrate the present invention, the following examples are provided for illustration. The PS powder used in the following embodiments of the invention is prepared by grinding recycled waste polystyrene plastics, and the granularity of the PS powder is 200 meshes; the used imidazoline emulsifier is self-made according to the synthesis method of the emulsifier in the literature, namely synthesis and performance evaluation of the modified imidazoline type asphalt emulsifier for micro-surfacing; all other raw materials used are commercially available.
Example 1
(1) Preparation of polystyrene emulsion:
adding 200 parts by weight of deionized water, 4 parts by weight of emulsifier disproportionated potassium abietate, 0.1 part by weight of initiator ammonium persulfate and 0.5 part by weight of PS powder into a polymerization kettle, stirring for 10min at room temperature and at the rotating speed of 350 r/min-400 r/min to uniformly disperse the raw materials, adding 100 parts by weight of refined monomer styrene, and introducing nitrogen into the polymerization kettle for 5 min-10 min for replacement; and then heating the polymerization kettle (the heating rate is controlled at 1 ℃/min), controlling the kettle temperature at 45-50 ℃, and reacting for 5h to obtain the anionic polystyrene emulsion.
The kinetic curve of the polystyrene emulsion provided in example 1 of the present invention is shown in FIG. 1.
(2) Modification of emulsified asphalt:
the preparation method comprises the following steps of (1) mixing an imidazoline emulsifier and a 1831 emulsifier in a water bath at 45 ℃ according to a mass ratio of 1: 3, mixing and uniformly stirring to obtain a transfer agent; and (2) dropwise adding 9 parts by weight of the transfer agent into a polymerization kettle filled with the anionic polystyrene emulsion obtained in the step (1) at the rotation speed of 350 r/min-400 r/min, stirring for 10min to uniformly disperse the transfer agent, and finally dropwise adding hydrochloric acid to adjust the pH value of the emulsion to 3-4 to obtain the transfer polystyrene emulsion.
Secondly, mixing the transformed polystyrene emulsion obtained in the step I and SBR latex according to the mass ratio of 1: 10, after compounding, modifying the emulsified asphalt according to the addition of 3 wt% of the matrix asphalt (Haiyun-70 #).
The high-temperature performance index (softening point) of the modified emulsified asphalt of example 1 is shown in table 1.
TABLE 1 data of high-temperature Performance index (softening Point) of modified emulsified asphalt of examples 1 to 6 of the present invention
Example 2
(1) Preparation of polystyrene emulsion:
by adopting the preparation method provided by the embodiment 1, the anionic polystyrene emulsion is obtained; the difference lies in that: the emulsifying agent potassium disproportionate abietate in example 1 was adjusted to 5 parts by weight, the PS powder was adjusted to 1 part by weight, and the stirring time in step (1) was extended to 20 min.
The kinetic curve of the polystyrene emulsion provided in example 2 of the present invention is shown in FIG. 1.
(2) Modification of emulsified asphalt:
the modification method provided in example 1 was used; the high-temperature performance index (softening point) of the modified emulsified asphalt of example 2 is shown in Table 1.
Example 3
(1) Preparation of polystyrene emulsion:
by adopting the preparation method provided by the embodiment 1, the anionic polystyrene emulsion is obtained; the difference lies in that: the emulsifying agent potassium disproportionate abietate in example 1 was adjusted to 6 parts by weight, the PS powder was adjusted to 2 parts by weight, and the stirring time in step (1) was extended to 30 min.
The kinetic curve of the polystyrene emulsion provided in example 2 of the present invention is shown in FIG. 1.
(2) Modification of emulsified asphalt:
the modification method provided in example 1 was used; the high-temperature performance index (softening point) of the modified emulsified asphalt of example 3 is shown in Table 1.
Example 4
(1) Preparation of polystyrene emulsion:
adding 0.5 part by weight of PS powder and 100 parts by weight of refined monomer styrene into a polymerization kettle, stirring for 10min at room temperature and the rotating speed of 350 r/min-400 r/min to fully dissolve the PS powder by the styrene, adding a mixed solution of 200 parts by weight of deionized water, 4 parts by weight of emulsifier disproportionated potassium rosinate and 0.1 part by weight of initiator ammonium persulfate, and introducing nitrogen into the polymerization kettle for 5 min-10 min for replacement; and then heating the polymerization kettle (the heating rate is controlled at 1 ℃/min), controlling the kettle temperature at 45-50 ℃, and reacting for 5h to obtain the anionic polystyrene emulsion.
The kinetic curve of the polystyrene emulsion provided in example 4 of the present invention is shown in FIG. 2.
(2) Modification of emulsified asphalt:
the preparation method comprises the following steps of (1) mixing an imidazoline emulsifier and a 1831 emulsifier in a water bath at 45 ℃ according to a mass ratio of 1: 3, mixing and uniformly stirring to obtain a transfer agent; and (2) dropwise adding 9 parts by weight of the transfer agent into a polymerization kettle filled with the anionic polystyrene emulsion obtained in the step (1) at the rotation speed of 350 r/min-400 r/min, stirring for 10min to uniformly disperse the transfer agent, and finally dropwise adding hydrochloric acid to adjust the pH value of the emulsion to 3-4 to obtain the transfer polystyrene emulsion.
Secondly, mixing the transformed polystyrene emulsion obtained in the step I and SBR latex according to the mass ratio of 1: 10 after compounding, the modified emulsified asphalt is added according to the addition of 3wt percent of the matrix asphalt (70 #).
The high-temperature performance index (softening point) of the modified emulsified asphalt of example 4 is shown in Table 1.
Example 5
(1) Preparation of polystyrene emulsion:
by the preparation method provided in example 4, an anionic polystyrene emulsion was obtained; the difference lies in that: the emulsifying agent potassium disproportionate abietate in example 4 was adjusted to 5 parts by weight, the PS powder was adjusted to 1 part by weight, and the stirring time in step (1) was extended to 20 min.
The kinetic curve of the polystyrene emulsion provided in example 5 of the present invention is shown in FIG. 2.
(2) Modification of emulsified asphalt:
the modification procedure provided in example 4 was used; the high-temperature performance index (softening point) of the modified emulsified asphalt of example 5 is shown in Table 1.
Example 6
(1) Preparation of polystyrene emulsion:
by the preparation method provided in example 4, an anionic polystyrene emulsion was obtained; the difference lies in that: the emulsifying agent potassium disproportionate abietate in example 4 was adjusted to 6 parts by weight, the PS powder was adjusted to 2 parts by weight, and the stirring time in step (1) was extended to 30 min.
The kinetic curve of the polystyrene emulsion provided in example 6 of the present invention is shown in FIG. 2.
(2) Modification of emulsified asphalt:
the modification procedure provided in example 4 was used; the high-temperature performance index (softening point) of the modified emulsified asphalt of example 6 is shown in Table 1.
In summary, comparing the kinetic curves of the polystyrene emulsions in fig. 1-2, it can be seen that the slope after adding the PS powder is significantly higher than that without adding the PS powder, which indicates that the reaction rate with adding the PS powder is higher than that without adding the PS powder.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The polystyrene emulsion for the modified emulsified asphalt is prepared from the following raw materials:
100 parts by weight of styrene;
0.2 to 5 parts by weight of polystyrene powder;
4-6 parts of emulsifier;
0.05 to 0.15 weight portion of initiator;
190-210 parts of water;
the polystyrene powder is formed by grinding polystyrene or waste polystyrene products.
2. The polystyrene emulsion for modified emulsified asphalt as claimed in claim 1, wherein the styrene is refined monomer styrene; the purity of the refined monomer styrene is more than 99 percent.
3. The polystyrene emulsion for modified emulsified asphalt as claimed in claim 1, wherein the polystyrene powder has a particle size of 100 to 300 mesh.
4. The polystyrene emulsion for modified emulsified asphalt as claimed in claim 1, wherein the emulsifier is selected from one or more of potassium disproportionated rosin acid, sodium dodecylbenzenesulfonate, sodium dodecylsulfonate, sodium dodecylsulfate, formaldehyde condensed naphthalenesulfonate, potassium oleate and sodium stearate.
5. The polystyrene emulsion for modified emulsified asphalt as claimed in claim 1, wherein the initiator is selected from one or more of hydrogen peroxide, t-butyl hydroperoxide, cumene hydroperoxide, ammonium persulfate and potassium persulfate.
6. A method for preparing the polystyrene emulsion for modified emulsified asphalt according to any one of claims 1 to 5, comprising the steps of:
a) mixing styrene, polystyrene powder, an emulsifier, an initiator and water, introducing inert gas for replacement, and reacting to obtain the polystyrene emulsion for the modified emulsified asphalt.
7. The method according to claim 6, wherein the mixing in step a) is carried out in a manner that:
adding water, an emulsifier, an initiator and polystyrene powder into a kettle reactor, stirring to uniformly disperse the raw materials, and adding styrene to obtain a raw material mixture;
or the like, or, alternatively,
adding polystyrene powder and styrene into a kettle type reactor, stirring to ensure that the polystyrene powder is fully dissolved by the styrene, and adding a mixed solution of water, an emulsifier and an initiator to obtain a raw material mixture.
8. The method according to claim 6, wherein the reaction in step a) is carried out at a temperature of 45 ℃ to 65 ℃ for a time of 4h to 8 h.
9. A method for modifying emulsified asphalt comprises the following steps:
transforming the polystyrene emulsion to obtain transformed polystyrene emulsion; and then mixing the transformed polystyrene emulsion and SBR latex according to the mass ratio of 1: (8-12) after compounding, modifying according to the addition of 1-5 wt% of the matrix asphalt to obtain modified emulsified asphalt;
the polystyrene emulsion is the polystyrene emulsion for modified emulsified asphalt as claimed in any one of claims 1 to 5.
10. The modification method according to claim 9, wherein the transformation process is specifically:
in water bath at 40-50 ℃, imidazoline emulsifier and 1831 emulsifier are mixed according to the mass ratio of 1: (2-4) mixing and uniformly stirring to obtain a transforming agent; and then taking 9 parts by weight of the transforming agent, dropwise adding the transforming agent into a kettle type reactor filled with 294.25-321.15 parts by weight of polystyrene emulsion under the condition that the rotating speed is 350-400 r/min, stirring for 5-15 min to uniformly disperse the transforming agent, and finally dropwise adding hydrochloric acid to adjust the pH value to be 2-5 to obtain the transformed polystyrene emulsion.
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Denomination of invention: A polystyrene lotion for modified emulsified asphalt and its preparation method and application Effective date of registration: 20230628 Granted publication date: 20220712 Pledgee: Binzhou branch of China CITIC Bank Co.,Ltd. Pledgor: Shandong Jingbo Zhongju New Materials Co.,Ltd. Registration number: Y2023980046606 |