CN113667315B - Polymer modified asphalt and preparation method thereof - Google Patents
Polymer modified asphalt and preparation method thereof Download PDFInfo
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- CN113667315B CN113667315B CN202110959998.8A CN202110959998A CN113667315B CN 113667315 B CN113667315 B CN 113667315B CN 202110959998 A CN202110959998 A CN 202110959998A CN 113667315 B CN113667315 B CN 113667315B
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- asphalt
- modified asphalt
- radical initiator
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
- C08L2207/24—Recycled plastic recycling of old tyres and caoutchouc and addition of caoutchouc particles
Abstract
The invention belongs to the technical field of modified asphalt, and particularly relates to polymer modified asphalt and a preparation method thereof. The polymer modified asphalt comprises, by weight, 1-5 parts of a free radical initiator, 20-50 parts of a polymer and 100-150 parts of petroleum asphalt, wherein the free radical initiator is used for promoting polymer particles and asphalt interfaces to form covalent bonds. According to the invention, the surface activity of the polymer particles is adjusted by the initiator, so that the interface connection between the polymer particles and the asphalt is changed from weak van der Waals force to stronger covalent bond, and the two are more closely connected, thereby being beneficial to giving full play to the characteristics of the two materials and improving the synergistic performance of the two materials.
Description
Technical Field
The invention belongs to the technical field of modified asphalt, and particularly relates to polymer modified asphalt and a preparation method thereof.
Background
The adhesion between the polymer and the asphalt in the polymer modified asphalt is mainly provided by van der waals force between the polymer and the asphalt, and the adhesion capability is weak. No method for modifying polymers with free radical initiators to induce asphalt-polymer interfacial bonding is currently available to researchers. Free radical chemistry is an effective means for modifying the surface of a polymer, and the surface of the polymer is activated through a free radical initiation reaction, so that a strong covalent bonding interface can be formed between the polymer and asphalt, the adhesive force between the polymer and the asphalt is enhanced, and the performance of the polymer modified asphalt is improved.
CN111978745A polymer modified asphalt composition and its preparation method, the said polymer modified asphalt composition includes 100-200 parts of base asphalt, 30-50 parts of SBS modifier, 20-40 parts of wollastonite, 20-40 parts of composite mineral fiber, 5-15 parts of cross linker, 5-15 parts of stabilizer, the preparation method steps are as follows: s1: uniformly mixing wollastonite and a cross-linking agent, adding composite mineral fiber, and uniformly stirring; s2: heating the base asphalt to 130-150 ℃, then adding the SBS modifier, the stabilizer and the mixed material in the S1 into the base asphalt, and uniformly stirring; s3: and (3) grinding the mixed material prepared in the step (S2) in a colloid mill and a shearing machine, and developing for 2-4h at 165-185 ℃ to obtain the polymer modified asphalt composition. Although the technical proposal discloses the combination of petroleum asphalt and a polymer modifier, the combination of the polymer modifier and a free radical initiator is not disclosed, and a covalent bond connecting structure is formed at the interface of the polymer and the asphalt.
CN109897390A discloses a polymer modified asphalt and a preparation method thereof, the polymer modified asphalt comprises the following components: the preparation method of the polymer modified asphalt comprises the following steps: weighing basic asphalt and a polymer, stirring and ultrasonically dispersing under a heating condition, and uniformly mixing to obtain a polymer-basic asphalt mixture; weighing the coupling agent, the accelerator and the compatilizer, adding the coupling agent, the accelerator and the compatilizer into the polymer-base asphalt mixture, stirring and ultrasonically dispersing the mixture, reacting for a period of time, shearing the mixture by using a high-speed shearing machine, and naturally cooling the mixture to room temperature to obtain the polymer modified asphalt. Although this solution discloses a combination of polymer and petroleum bitumen, no synergistic cooperation of polymer and bitumen is disclosed.
Therefore, the prior art still lacks a high-performance modified asphalt which fully performs the functions of the polymer and the asphalt.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides polymer modified asphalt, which aims to perform activation modification on the surface of a polymer by some simple and easy chemical methods, improve the bonding performance between a polymer and an asphalt interface, form strong covalent bond connection between the polymer and the asphalt interface, solve the problem of insufficient bonding force between polymer particles and the asphalt and improve the performance of the polymer modified asphalt.
In order to achieve the above object, according to one aspect of the present invention, there is provided a polymer modified asphalt comprising, by weight, 1 to 5 parts of a radical initiator, 20 to 50 parts of a polymer, and 100 to 150 parts of petroleum asphalt, wherein the radical initiator is used to promote the formation of covalent bonds at the interface between the polymer particles and the asphalt.
Preferably, the radical initiator is cumene hydroperoxide or potassium persulfate.
Preferably, the polymer is at least one of Acrylonitrile Butadiene Styrene (ABS) particles, neoprene (CR) particles, and waste tire rubber particles.
Preferably, the particle size of the polymer does not exceed 0.075mm.
Preferably, the petroleum asphalt is 70# petroleum asphalt or 90# petroleum asphalt.
Preferably, the mass ratio of the petroleum asphalt to the polymer is 100 (20-35).
Preferably, the mass ratio of the petroleum asphalt to the free radical initiator is 100 (1.5-4).
According to another aspect of the present invention, there is provided a method for preparing polymer modified asphalt, comprising the steps of:
(1) Firstly, stirring polymer particles, and spraying an initiator at the same time to wrap the initiator on the surfaces of the polymer particles to obtain wet powder;
(2) Heating petroleum asphalt to become a flowable state;
(3) And adding the wet powder into the petroleum asphalt in a flowable state, and uniformly stirring and mixing to obtain the polymer modified asphalt.
Preferably, the radical initiator is added to the benzene-based solvent in step (1) to prepare a solution.
Preferably, the heating temperature in the step (2) is 100-130 ℃ and the heating time is 10-30 minutes.
The invention has the following beneficial effects:
(1) According to the invention, the surface activity of the polymer particles is adjusted by the initiator, so that the interface connection between the polymer particles and the asphalt is changed from weak van der Waals force to stronger covalent bond, and the two covalent bonds have tighter connection degree, thereby being beneficial to fully exerting the characteristics of the two materials and improving the synergistic performance of the two materials.
(2) Compared with the traditional polymer modified asphalt, the novel high-performance polymer modified asphalt provided by the invention has the advantage that the anti-rutting performance is obviously improved.
(3) The polymer surface modification in the invention is carried out in a normal temperature environment, the utilization rate of the initiator is improved by a spraying mode, the use amount of the initiator is reduced, the implementation process is simple and easy, and the cost control and the environmental protection are facilitated. Meanwhile, waste tire rubber particles can be used as a polymer raw material, so that the energy is saved, the environment is protected, and the cost is low.
(4) The polymer particles after surface modification can react with asphalt within a few minutes under the common asphalt mixing condition, and the initiator promotes the formation of the covalent bonds between the polymer particles and the asphalt interface, thereby being beneficial to improving the production efficiency of the polymer modified asphalt.
Drawings
FIG. 1 is a schematic representation of a comparison of polymer modified asphalt before and after interfacial modification according to the present invention;
fig. 2 is a graph showing the rutting index test of example 1 of the present invention and comparative example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
Preparation examples
Screening of the polymer particles: sieving polymer particles with a particle size of not more than 0.075mm, wherein the polymer is Acrylonitrile Butadiene Styrene (ABS) particles.
Example 1
A novel high-performance polymer modified asphalt is prepared by the following method:
(1) Weighing 20g of polymer particles, spreading the polymer particles in a stirrer as much as possible, uniformly spraying 1.5g of initiator liquid on the surfaces of the polymer particles, stirring while spraying to ensure that the surfaces of the polymer particles are coated with the initiator to be in a wet powder state, and standing for 10 minutes to obtain surface-modified polymer particles;
(2) Weighing 100g of heated asphalt by using a metal container, pouring the heated asphalt into a constant-temperature stirrer, setting the temperature to be 120 ℃, starting an instrument for 10-15 seconds, slowly adding the component (1), continuously stirring, sampling after the stirring lasts for 1 minute, and sealing to obtain high-performance polymer modified asphalt;
examples 2 to 5 were prepared in the same manner as in comparative examples 1 to 3, except that the polymer particles, the radical initiator and the petroleum asphalt were different in mass and ratio, as shown in Table 1.
The testing method of the rut index comprises the following steps: according to the T315-04 test method, the phase angle delta and the complex modulus G of asphalt mucilage with different fillers * Measuring, and calculating the rutting resistant factor G of the asphalt cement * Sin delta to evaluate the rutting resistance of the asphalt mastic material. The test results are shown in table 1.
TABLE 1 formulation and test results table for the examples
FIG. 1 is a schematic representation of a comparison of polymer modified asphalt before and after interfacial modification according to the present invention. According to the invention, the surface activity of the polymer particles is adjusted by the initiator, so that the interface connection between the polymer particles and the asphalt is changed from weak van der Waals force to stronger covalent bond, and the two are more closely connected, thereby being beneficial to giving full play to the characteristics of the two materials and improving the synergistic performance of the two materials.
FIG. 2 is a graph showing rutting index measurements of inventive example 1 and comparative example 1.
As can be seen from fig. 2, the asphalt (corresponding to example 1) to which the surface-modified ABS (ABS-T) was added had more excellent anti-rutting properties (rutting index G/sin δ) than the asphalt (corresponding to comparative example 1) to which the unmodified ABS (ABS-UT) was added.
Analysis of the data in Table 1 reveals that the surface modified polymer modified asphalt has much higher rutting resistance than polymer modified asphalt without added initiator. When the addition amount of the initiator is as follows: mass of polymer: when the matrix asphalt mass is 100 (1.5-4) and the matrix asphalt mass is 20-35), the anti-rutting performance of the sample is more excellent. The result shows that the anti-rutting performance of the polymer modified asphalt can be effectively improved by the polymer and the initiator with proper addition amount.
In conclusion, the invention utilizes the action of the free radical initiator on the surface activity excitation of the polymer particles, so that the modified polymer particles and the asphalt interface form strong covalent bond connection, the rutting resistance of the modified asphalt is obviously improved compared with the polymer modified asphalt without the initiator, and the modified asphalt can be applied as a novel pavement material.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The preparation method of the polymer modified asphalt is characterized by comprising the following steps:
(1) Firstly, stirring polymer particles, and spraying a free radical initiator to wrap the initiator on the surfaces of the polymer particles to obtain wet powder; the free radical initiator is cumene hydroperoxide or potassium persulfate;
(2) Heating petroleum asphalt to become a flowable state;
(3) Adding the wet powder into the petroleum asphalt in a flowable state, and stirring and mixing uniformly to obtain polymer modified asphalt;
the polymer modified asphalt comprises, by weight, 1-5 parts of a free radical initiator, 20-50 parts of a polymer and 100-150 parts of petroleum asphalt, wherein the free radical initiator is used for promoting the formation of covalent bonds between polymer particles and an asphalt interface.
2. The method for producing polymer-modified asphalt according to claim 1, wherein the radical initiator is added to the benzene-based solvent in step (1) to prepare a solution.
3. The method for preparing polymer modified asphalt according to claim 1, wherein the heating temperature in the step (2) is 100 to 130 ℃ and the heating time is 10 to 30 minutes.
4. The method of claim 1, wherein the polymer is at least one of acrylonitrile butadiene styrene pellets, neoprene pellets, and waste tire rubber pellets.
5. The method of claim 4, wherein the polymer particles have a particle size of no more than 0.075mm.
6. The method of claim 4, wherein the petroleum asphalt is 70# petroleum asphalt or 90# petroleum asphalt.
7. The method of claim 6, wherein the mass ratio of the petroleum asphalt to the polymer is 100 (20-35).
8. The method of claim 6, wherein the mass ratio of the petroleum asphalt to the radical initiator is 100 (1.5-4).
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| CN202110959998.8A CN113667315B (en) | 2021-08-20 | 2021-08-20 | Polymer modified asphalt and preparation method thereof |
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| CN202110959998.8A CN113667315B (en) | 2021-08-20 | 2021-08-20 | Polymer modified asphalt and preparation method thereof |
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6057390A (en) * | 1998-06-03 | 2000-05-02 | Ashland Inc. | Crosslinkable polymer-modified asphalt and its method of preparation |
| US6713540B2 (en) * | 2002-03-08 | 2004-03-30 | Polimeri Europa Americas, Inc. | Method for crosslinking asphalt compositions and the product resulting therefrom |
| CN1203122C (en) * | 2002-07-19 | 2005-05-25 | 成都新柯力化工科技有限公司 | Polyethylene modified asphalt agglomerate and its making process |
| CN1233748C (en) * | 2003-01-22 | 2005-12-28 | 中国石油化工股份有限公司北京燕山分公司研究院 | Modified compsn. of asphaltum and preparation method |
| US7205344B2 (en) * | 2003-08-04 | 2007-04-17 | General Electric Company | Crosslinker for modified asphalt |
| WO2009013339A1 (en) * | 2007-07-26 | 2009-01-29 | Shell Internationale Research Maatschappij B.V. | Polymer-modified bitumen composition |
| RU2522618C2 (en) * | 2012-07-17 | 2014-07-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Иркутский государственный университет" | Method of obtaining polymer-bitumen compositions |
| CN102850506B (en) * | 2012-08-27 | 2014-04-16 | 句容宁武科技开发有限公司 | Preparation method of polyurethane modified asphalt |
| CN107722655A (en) * | 2017-11-01 | 2018-02-23 | 铁岭尔凡橡塑研发有限公司 | A kind of application of pavement asphalt and its production technology as well as affixing kerfs belt |
| CN109628063A (en) * | 2018-12-19 | 2019-04-16 | 大连理工大学 | A kind of polymer modified asphalt binder and preparation method thereof |
| CN110003672B (en) * | 2019-04-17 | 2021-05-04 | 山东显元化工研究院有限公司 | SBR (styrene butadiene rubber) modified asphalt and preparation method thereof |
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