CN112961295B - Methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt - Google Patents
Methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt Download PDFInfo
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- CN112961295B CN112961295B CN202110242534.5A CN202110242534A CN112961295B CN 112961295 B CN112961295 B CN 112961295B CN 202110242534 A CN202110242534 A CN 202110242534A CN 112961295 B CN112961295 B CN 112961295B
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- asphalt
- methyl methacrylate
- butyl acrylate
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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
- C08F289/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
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- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to the field of modified asphalt, in particular to methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt which is characterized by being prepared by carrying out in-situ copolymerization on methyl methacrylate and butyl acrylate in asphalt, and the modified asphalt has uniform product and no segregation problem. The technical scheme of the invention is simple to operate, has obvious effect of improving the toughness of the asphalt and has great application value.
Description
Field of application
The invention relates to the field of modified asphalt, in particular to methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt.
Background
With the rapid development of the traffic industry of China, roads are planned and constructed more and more. Asphalt is the main material for road pavement in China. Asphalt pavement has the advantages of smooth surface, no joints, comfortable driving, small vibration, low noise, simple and convenient maintenance and the like, but has some defects, such as poor temperature stability of asphalt materials, easy softening in summer and easy brittle fracture in winter, and particularly the asphalt materials become brittle at low temperature to cause pavement cracking, which is the main reason for damaging the asphalt pavement.
In order to avoid low temperature cracking of asphalt, it is desirable to increase the toughness of asphalt, and it is particularly desirable to produce high toughness asphalt. It is now common to add rubber, resins, fibers, etc. to asphalt. For example, the asphalt is mixed with styrene-butadiene rubber, chloroprene rubber, polybutadiene rubber, styrene-butadiene-styrene block copolymer (namely SBS) and other rubbers to form rubber modified asphalt, so that the low-temperature deformability of the asphalt can be improved, and the toughness of the asphalt can be improved.
Compared with unmodified matrix asphalt, the modified asphalt provided by the invention has the advantages that the toughness is greatly improved, the product is uniform, the problem of segregation does not exist, the preparation method is simple, and the modified asphalt has great application value.
Disclosure of Invention
The invention adopts the in-situ copolymerization reaction of methyl methacrylate and butyl acrylate in the asphalt to prepare the modified asphalt with the in-situ copolymerization of the methyl methacrylate and the butyl acrylate.
The specific method comprises the following steps: weighing matrix asphalt (70 #), methyl methacrylate and butyl acrylate in a beaker, heating to 65 ℃, adding an initiator Benzoyl Peroxide (BPO), stirring, then heating to 70 ℃, and stirring for reaction for 1h; then heating to 80 ℃, and stirring for reaction for 1h; continuously heating to 90 ℃, and stirring for reaction for 5 hours; and after the reaction is finished, obtaining the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt.
Preferably, the relative mass ratio of the matrix asphalt to the acrylate monomer is 10 to (6-10); the relative mass ratio of the methyl methacrylate to the butyl acrylate is 5: 5-12.
Product toughness is characterized by measuring elongation at break. The greater the elongation at break, the higher the toughness.
Tests show that the elongation at break of the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt is (513-641)%, and is obviously improved compared with 179% of matrix asphalt (70 #), which indicates that the toughness of the asphalt can be greatly improved by the modification technical scheme provided by the invention.
Because the methyl methacrylate-butyl acrylate in-situ copolymer is dispersed in the asphalt, the modified asphalt product is uniform and has no segregation problem.
Detailed Description
The technical solution of the present invention is further described with reference to the following specific examples, but the present invention is not limited thereto.
The elongation at break test process of the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt is as follows: heating the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt to 90 ℃, injecting the heated asphalt into a 1A type polytetrafluoroethylene standard die, cooling, taking out a dumbbell-shaped sample, and measuring the elongation at break by adopting a universal tensile machine at the constant temperature of 13 ℃.
Example 1: weighing 10g of matrix asphalt (70 #), 5g of methyl methacrylate and 5g of butyl acrylate in a beaker, heating to 65 ℃, adding 0.070g of initiator Benzoyl Peroxide (BPO), stirring, heating to 70 ℃, and stirring for reacting for 1h; then heating to 80 ℃, and stirring for reaction for 1h; continuously heating to 90 ℃, and stirring for reaction for 5 hours; and (4) after the reaction is finished, obtaining the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt. The elongation at break of the test specimen was 626%.
Example 2: weighing 10g of matrix asphalt (70 #), 3g of methyl methacrylate and 7g of butyl acrylate in a beaker, heating to 65 ℃, adding 0.070g of initiator Benzoyl Peroxide (BPO), stirring, heating to 70 ℃, and stirring for reacting for 1h; then heating to 80 ℃, and stirring for reaction for 1h; continuously heating to 90 ℃, and stirring for reaction for 5 hours; and (4) after the reaction is finished, obtaining the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt. The test specimen elongation at break was 641%.
Example 3: weighing 12g of matrix asphalt (70 #), 4g of methyl methacrylate and 4g of butyl acrylate in a beaker, heating to 65 ℃, adding 0.056g of initiator Benzoyl Peroxide (BPO), stirring, heating to 70 ℃, and stirring for reaction for 1 hour; then heating to 80 ℃, and stirring for reaction for 1h; continuously heating to 90 ℃, and stirring for reaction for 5 hours; after the reaction is finished, the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt is obtained. The test piece elongation at break was 513%.
Example 4: weighing 12g of matrix asphalt (70 #), 2.4g of methyl methacrylate and 5.6g of butyl acrylate in a beaker, heating to 65 ℃, adding 0.056g of initiator Benzoyl Peroxide (BPO), stirring, heating to 70 ℃, and stirring for reaction for 1 hour; then heating to 80 ℃, and stirring for reaction for 1h; continuously heating to 90 ℃, and stirring for reaction for 5 hours; and after the reaction is finished, the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt is obtained. The test piece elongation at break was 545%.
Comparative example 1: heating matrix asphalt (70 #) to 90 ℃, injecting the matrix asphalt into a 1A type polytetrafluoroethylene standard die while the matrix asphalt is hot, cooling, taking out a dumb bell-shaped sample, and measuring the elongation at break by using a universal tensile machine at a constant temperature of 13 ℃, wherein the elongation at break is 179 percent.
The results of examples 1-4 and comparative example 1 are summarized in the table.
Table examples and comparative examples raw material ratios and test results are summarized
As can be seen from the table, the relative contents of methyl methacrylate and butyl acrylate in the asphalt have a great influence on the elongation at break of the modified asphalt. Preferably, the relative mass ratio of the matrix asphalt to the acrylate monomer is 10: 6-10; the relative mass ratio of the methyl methacrylate to the butyl acrylate is 5: 5-12.
The elongation at break of the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt is (513-641)%, which is obviously improved compared with 179% of matrix asphalt (70 #).
It is worth noting that the substitution of methyl methacrylate for hydroxyethyl acrylate (HEA) or 2-phenoxyethyl acrylate (PHEA) in the above-mentioned technical solution does not allow to obtain a homogeneous modified bituminous product. It was found that hydroxyethyl acrylate (HEA) or 2-phenoxyethyl acrylate (PHEA) could not participate in the reaction of modified asphalt, indicating that the choice of monomer is critical and not any acrylate monomer.
The technical scheme for modifying the asphalt provided by the invention is simple to operate, has an obvious effect of improving the toughness of the asphalt, and has a great application value.
Claims (1)
1. The methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt is characterized by being prepared by adopting methyl methacrylate and butyl acrylate to carry out in-situ copolymerization reaction in the asphalt, and the specific method comprises the following steps: weighing matrix asphalt, methyl methacrylate and butyl acrylate in a beaker, wherein the mass ratio of the matrix asphalt to the methyl methacrylate to the butyl acrylate is 10: 10, the mass ratio of the methyl methacrylate to the butyl acrylate is 3: 7, heating to 65 ℃, adding an initiator benzoyl peroxide, stirring, heating to 70 ℃, and stirring for reaction for 1h; then heating to 80 ℃, and stirring for reaction for 1h; continuously heating to 90 ℃, and stirring for reaction for 5 hours; and after the reaction is finished, obtaining the methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110242534.5A CN112961295B (en) | 2021-03-04 | 2021-03-04 | Methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt |
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| CN202110242534.5A CN112961295B (en) | 2021-03-04 | 2021-03-04 | Methyl methacrylate-butyl acrylate in-situ copolymerization modified asphalt |
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| CN112961295A CN112961295A (en) | 2021-06-15 |
| CN112961295B true CN112961295B (en) | 2022-11-18 |
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| CN114381132B (en) * | 2022-01-14 | 2022-12-06 | 苏州科技大学 | Copolymer modified asphalt |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397358A (en) * | 2008-10-31 | 2009-04-01 | 句容市宁武化工有限公司 | Method for preparing modified asphalt |
| CN104592458A (en) * | 2013-11-04 | 2015-05-06 | 阚健美 | An asphalt preparing method |
| CN105820485A (en) * | 2014-12-11 | 2016-08-03 | 李保集 | Modified road asphalt and preparation method thereof |
| CN106433158A (en) * | 2016-07-07 | 2017-02-22 | 交通运输部科学研究院 | Preparation method of modified biological asphalt, modified biological asphalt and use thereof |
| CN108178933A (en) * | 2017-12-29 | 2018-06-19 | 重庆市盛百利防水建材有限公司 | A kind of modified pitch and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397358A (en) * | 2008-10-31 | 2009-04-01 | 句容市宁武化工有限公司 | Method for preparing modified asphalt |
| CN104592458A (en) * | 2013-11-04 | 2015-05-06 | 阚健美 | An asphalt preparing method |
| CN105820485A (en) * | 2014-12-11 | 2016-08-03 | 李保集 | Modified road asphalt and preparation method thereof |
| CN106433158A (en) * | 2016-07-07 | 2017-02-22 | 交通运输部科学研究院 | Preparation method of modified biological asphalt, modified biological asphalt and use thereof |
| CN108178933A (en) * | 2017-12-29 | 2018-06-19 | 重庆市盛百利防水建材有限公司 | A kind of modified pitch and preparation method thereof |
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