CN112280325B - Anti-cracking asphalt and preparation method thereof - Google Patents
Anti-cracking asphalt and preparation method thereof Download PDFInfo
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- CN112280325B CN112280325B CN202011273054.7A CN202011273054A CN112280325B CN 112280325 B CN112280325 B CN 112280325B CN 202011273054 A CN202011273054 A CN 202011273054A CN 112280325 B CN112280325 B CN 112280325B
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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
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Abstract
The application relates to the field of asphalt, and particularly discloses anti-cracking asphalt and a preparation method thereof. The cracking-resistant asphalt is prepared from the following raw materials in parts by weight: matrix asphalt; a modifier; a filler; an antioxidant. The preparation method comprises the following steps: s1, mixing the matrix asphalt and the antioxidant according to the proportion, stirring for 30-60min, and standing after stirring to obtain a first-level mixture; s2, adding the modifier into the primary mixture according to the proportion, stirring for 30-40min, and standing after stirring to obtain a secondary mixture; and S3, adding the filler into the secondary mixture according to the proportion, and stirring for 30-60min to obtain the formed anti-cracking asphalt. The anti-cracking asphalt has excellent elasticity and toughness, so that the capacity of delaying damage or resisting fracture when the asphalt pavement is under the load action of a large load-carrying vehicle can be enhanced, and the service life of the asphalt pavement is prolonged to a certain extent. In addition, the preparation method is simple to operate, the preparation conditions are easy to achieve, and the method can be popularized on a large scale.
Description
Technical Field
The application relates to the field of asphalt, in particular to anti-cracking asphalt and a preparation method thereof.
Background
Asphalt is a dark brown complex mixture composed of hydrocarbons with different molecular weights and nonmetallic derivatives thereof, is one of high-viscosity organic liquids, and is divided into natural asphalt, coal tar asphalt and petroleum asphalt. Asphalt is widely used in the fields of paint, plastics, rubber, pavement and the like due to rich reserves and excellent performance.
Asphalt concrete as an asphalt pavement material is subjected to repeated action of vehicle load and long-term influence of environmental factors in the use process.
Toughness is one of the evaluation parameters for asphalt properties, which can measure the delayed failure and the ability to resist fracture after tensile yield of asphalt. The asphalt concrete is used as an asphalt pavement material, and the toughness of asphalt is directly related to the service life of an asphalt pavement under the repeated action of vehicle load in the using process.
In view of the above-mentioned related technologies, the inventors believe that during the use of asphalt pavement, especially asphalt pavement near large factories (such as sand and stone factories with sand trucks for large trucks), the asphalt pavement is prone to deformation or even fracture due to load action due to insufficient toughness of asphalt during long-term use.
Disclosure of Invention
In order to improve the toughness of asphalt, the application provides anti-cracking asphalt and a preparation method thereof.
In a first aspect, the application provides an anti-cracking asphalt, which adopts the following technical scheme:
the cracking-resistant asphalt is prepared from the following raw materials in parts by weight:
100-120 parts of base asphalt;
1-4 parts of a modifier;
20-30 parts of a filler;
0.3-0.7 part of antioxidant;
the modifier is prepared from (30-50) by weight: (50-70) o-diallylbisphenol A and a bisphenol A epoxy resin.
By adopting the technical scheme, the epoxy molecules in the bisphenol A type epoxy resin and the molecules in the matrix asphalt generate stronger connectivity, so that the toughness of the matrix asphalt is enhanced; the o-diallyl bisphenol A has a similar benzene chain structure with the bisphenol A epoxy resin, and the o-diallyl bisphenol A is better compatible with the bisphenol A epoxy resin, so that the o-diallyl bisphenol A can enhance the compatibility of the bisphenol A epoxy resin with the matrix asphalt; in addition, the toughness of the matrix asphalt can be enhanced by the o-diallyl bisphenol A, the weather resistance of the o-diallyl bisphenol A is better, the weather resistance of the matrix asphalt can be improved, the toughness of the matrix asphalt can be improved, the capability of delaying damage or resisting fracture when the asphalt pavement is subjected to the load of a large load-carrying vehicle can be enhanced, and the service life of the asphalt pavement is prolonged to a certain extent.
The filler enhances the elastic stress of the base asphalt by adding the filler to the base asphalt; by adding the antioxidant into the matrix asphalt, the antioxidant can reduce the possibility of oxidation of the modifier and the matrix asphalt, so that the modifier can effectively improve the toughness of the asphalt, and further ensure that the asphalt pavement has certain capacity of delaying damage or resisting fracture under the load action to a certain extent.
Compared with the related technology, the scheme improves the capability of delaying the damage or resisting the fracture of the asphalt pavement when bearing a larger load by improving the toughness of the matrix asphalt by utilizing the modifier, can improve the service life of the asphalt pavement to a certain extent, and improves the oxidation resistance of the modifier by combining other components, so that the modifier is not easy to be oxidized, thereby improving the service life of the modifier.
Preferably, the modifier is prepared from (35-45): (55-65) o-diallylbisphenol A and a bisphenol A epoxy resin.
By adopting the technical scheme, the o-diallyl bisphenol A and the bisphenol A type epoxy resin with specific mixing amount are added, so that better synergistic effect is generated between the o-diallyl bisphenol A and the bisphenol A type epoxy resin, and the toughness of the matrix asphalt is effectively improved.
Preferably, the modifier is prepared by mixing 40:60 o-diallyl bisphenol A and bisphenol A epoxy resin.
By adopting the technical scheme, the o-diallyl bisphenol A and the bisphenol A type epoxy resin with specific mixing amount are added, so that the synergistic effect of the o-diallyl bisphenol A and the bisphenol A type epoxy resin is optimized, and the toughness of the matrix asphalt is better improved.
Preferably, the filler is selected from one or two of nitrile rubber and ethylene propylene diene monomer.
By adopting the technical scheme, the tearing resistance of the matrix asphalt is improved by the nitrile rubber, so that the fracture resistance of the matrix asphalt is improved; the main chain of the ethylene propylene diene monomer molecule consists of chemically stable saturated hydrocarbon, and can improve the toughness of the matrix asphalt when used as a filling agent, and the unsaturated double bond of the side chain of the ethylene propylene diene monomer molecule has better compatibility with o-diallyl bisphenol A and bisphenol A epoxy resin.
Preferably, the antioxidant is selected from one or two of an antioxidant 1024 and an antioxidant 1076.
By adopting the technical scheme, the antioxidant 1024 can effectively reduce the possibility of oxidation of o-diallyl bisphenol A and bisphenol A epoxy resin, so that the effective action time of the modifier can be prolonged; the antioxidant 1076 can effectively reduce the possibility of oxidation of the o-diallyl bisphenol A, and the antioxidant 1076 has a lower melting point and a lower required doping temperature.
In a second aspect, the application provides a preparation method of anti-cracking asphalt, which adopts the following technical scheme:
the preparation method of the anti-cracking asphalt comprises the following steps:
s1, mixing the matrix asphalt with the antioxidant according to the proportion, heating and stirring at the rotating speed of 60-70r/min for 30-60min to obtain a first-grade mixture;
s2, adding a modifier into the primary mixture according to the proportion, and heating and stirring at the rotating speed of 120-130r/min for 30-40min to obtain a secondary mixture;
and S3, adding the filler into the secondary mixture according to the proportion, and heating and stirring at the rotating speed of 60-70r/min for 30-60min to obtain the anti-cracking asphalt.
By adopting the technical scheme, the fluidity of the matrix asphalt can be improved by heating, and the matrix asphalt is easy to be doped with other materials. The antioxidant, the modifier and the filler are sequentially added and stirred, so that the antioxidant, the modifier and the filler can be fully mixed and reacted with the matrix asphalt, the prepared anti-cracking asphalt has better toughness and fracture resistance, and the service life of the asphalt pavement is prolonged.
Preferably, in the step S1, the temperature of the material during stirring is 70-80 ℃; in the step S2, the temperature of the material during stirring is 110-140 ℃; in the step S3, the temperature of the material during stirring is 120-180 ℃.
By adopting the technical scheme, different temperatures are adopted in different steps, so that the matrix asphalt and the materials added in different stages can be fully mixed.
Preferably, in the step of S1, 0.3 to 0.7 parts of antioxidant is dissolved in 3 to 7 parts of ethyl acetate, and then mixed into the base asphalt.
By adopting the technical scheme, the powdery antioxidant is dissolved in the ethyl acetate and then added into the matrix asphalt, so that the antioxidant is more uniformly distributed in the matrix asphalt. The ethyl acetate has a boiling point of 77 ℃ and is volatilized from the base asphalt at the temperature of 110-140 ℃ in S2, so that the possibility that the ethyl acetate remains in the asphalt and affects the asphalt can be reduced.
In summary, the present application has the following beneficial effects:
1. the matrix asphalt is adopted as the main raw material of the road asphalt, the matrix asphalt is easy to age and generate cracks, and the modifier is added into the matrix asphalt to strengthen the toughness of the matrix asphalt and the connectivity of each component, so that the delayed damage or fracture resistance of the matrix asphalt during vehicle running is improved, and the service life of the matrix asphalt is further prolonged;
2. the application utilizes the synergistic effect between the o-diallyl bisphenol A and the bisphenol A epoxy resin to effectively improve the compatibility between the bisphenol A epoxy resin and the matrix asphalt, and the bisphenol A epoxy resin improves the connection strength of each component in the matrix asphalt;
3. according to the preparation method, different temperatures are adopted when different materials are added, so that the materials can be well prevented from being denatured due to the influence of high temperature while uniform mixing is ensured; by adding the antioxidant to the organic solvent, the degree of dispersion of the antioxidant in the base asphalt is enhanced.
Detailed Description
The present application will be described in further detail with reference to examples.
TABLE 1 sources and types of the raw Material Components
Examples 1 to 6
Examples 1 to 6 all adopt the same preparation method to prepare the anti-cracking asphalt, and the differences are only in the mixing amount of each raw material component, and the specific differences are shown in table 2:
table 2 blending amounts of each raw material components in examples 1 to 6
In examples 1 to 6, each modifier was prepared by mixing o-diallylbisphenol A and bisphenol A epoxy resin at a weight ratio of 40: 60.
All the above examples were prepared using the following preparation method:
s1, dissolving an antioxidant into an organic solvent ethyl acetate according to a ratio to prepare an antioxidant solution, mixing the substrate asphalt with the antioxidant solution, heating and stirring at a rotating speed of 60r/min for 60min, wherein the stirring temperature is 75 ℃, so as to obtain a first-stage mixture;
s2, adding the modifier into the primary mixture according to the proportion, heating and stirring at the rotating speed of 120r/min for 40min, and stirring at the temperature of 130 ℃ to obtain a secondary mixture;
and S3, adding the filler into the secondary mixture according to the proportion, heating and stirring at the rotating speed of 60r/min for 120min, and obtaining the cracking-resistant asphalt, wherein the stirring temperature is 120 ℃.
Example 7
This example differs from example 3 only in that: the modifier is formed by mixing 35: 70 parts by weight of o-diallyl bisphenol A and bisphenol A epoxy resin.
Example 8
This example differs from example 3 only in that: the modifier is formed by mixing ortho-diallyl bisphenol A and bisphenol A epoxy resin in a weight ratio of 35: 60.
Example 9
This example differs from example 3 only in that: the modifier is formed by mixing o-diallyl bisphenol A and bisphenol A epoxy resin in a weight ratio of 40: 58.
Example 10
This example differs from example 3 only in that: the modifier is formed by mixing o-diallyl bisphenol A and bisphenol A epoxy resin in a weight ratio of 45: 65.
Example 11
This example differs from example 3 only in that: the modifier is formed by mixing o-diallyl bisphenol A and bisphenol A epoxy resin in a weight ratio of 45: 60.
Example 12
This example differs from example 3 only in that: the modifier is formed by mixing ortho-diallyl bisphenol A and bisphenol A epoxy resin in a weight ratio of 45: 55.
Example 13
This example differs from example 3 only in that: the filler was replaced with an equal amount of talc.
Comparative example 1
This comparative example differs from example 3 only in that: the amount of modifier used was 60 g.
Comparative example 2
The comparative example only differs from example 3 in that: the modifier is formed by mixing 60:40 o-diallyl bisphenol A and bisphenol A epoxy resin in weight ratio.
The performance test was performed on the cracking-resistant asphalt in each example and each comparative example, and the test procedure was as follows:
(1) the cracking-resistant asphalt prepared in each example and each proportion is determined by referring to a T0627-2011 asphalt bending creep stiffness test in the standard of JTG E20-2011 Experimental regulations for road engineering asphalt and asphalt mixtures.
(2) The anti-cracking asphalt prepared in each example and each proportion is determined by referring to a T0662-2000 asphalt elasticity recovery test in JTG E20-2011 Standard of road engineering asphalt and asphalt mixture test Specification.
(3) The cracking-resistant asphalt prepared in each example and each proportion is measured by referring to T0605-2011l asphalt ductility test in JTG E20-2011 road engineering asphalt and asphalt mixture test specification standards.
TABLE 3 Experimental test data for examples 1-13 and comparative examples 1-2
Referring to tables 2 and 3, in example 3, the optimal synergistic effect is exerted by the ratio of the o-diallyl bisphenol a to the bisphenol a type epoxy resin, the optimal toughness performance is exerted by the matrix asphalt, the ability of delaying the damage or resisting the fracture of the asphalt pavement when bearing a larger load is improved, and the service life of the asphalt pavement can be prolonged to a certain extent.
Referring to table 3, in comparative example 1, the amount of modifier used was increased compared to example 3, and as can be seen from the data in table 3, the modifier disclosed herein was used in an amount effective to improve the toughness of asphalt, and excessive modifier decreased the elastic recovery and ductility of the base asphalt, and was liable to fracture when the external pressure was excessive.
Referring to table 3, comparative example 2 increased the weight ratio of ortho-diallyl bisphenol a in the modifier, resulting in a decrease in flexural modulus strength and elastic recovery force of the matrix asphalt, compared to examples 1 to 13. The anti-cracking matrix asphalt prepared by the modifier in the proportioning range disclosed by the application has better toughness, and the service life of the asphalt pavement is prolonged to a certain extent.
Referring to table 3, in example 13, compared to example 3, the flexural modulus strength, elastic recovery force and ductility of the base asphalt in example 13 are all decreased to some extent, which indicates that the epdm and the nitrile rubber disclosed in the present application have better enhancing effects on the performance of the base asphalt, and have better synergistic effects with the modifier.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (6)
1. The cracking-resistant asphalt is characterized in that: the feed is prepared from the following raw materials in parts by weight:
100-120 parts of base asphalt;
1-4 parts of a modifier;
20-30 parts of a filler;
0.3-0.7 part of antioxidant;
the modifier is prepared from the following components in a weight ratio of 40:60 o-diallyl bisphenol A and bisphenol A epoxy resin;
the cracking-resistant asphalt is prepared by the following steps:
s1, mixing the matrix asphalt with the antioxidant according to the proportion, heating and stirring at the rotating speed of 60-70r/min for 30-60min to obtain a first-grade mixture;
s2, adding a modifier into the primary mixture according to the proportion, and heating and stirring at the rotating speed of 120-130r/min for 30-40min to obtain a secondary mixture;
s3, adding a filler into the secondary mixture according to the proportion, heating and stirring at the rotating speed of 60-70r/min for 30-60min to obtain the anti-cracking asphalt;
in the step S1, 0.3 to 0.7 part of antioxidant is dissolved in 3 to 7 parts of ethyl acetate, and then mixed into the base asphalt.
2. The cracking-resistant asphalt of claim 1, wherein: the filler is selected from one or two of nitrile rubber and ethylene propylene diene monomer.
3. The cracking-resistant asphalt of claim 1, wherein: the antioxidant is selected from one or two of antioxidant 1024 and antioxidant 1076.
4. The method for preparing cracking-resistant asphalt according to any one of claims 1 to 3, wherein the method comprises the following steps: the method comprises the following steps:
s1, mixing the matrix asphalt and the antioxidant according to the proportion, heating and stirring at the rotating speed of 60-70r/min for 30-60min to obtain a first-grade mixture;
s2, adding a modifier into the primary mixture according to the proportion, heating and stirring at the rotating speed of 120-130r/min for 30-40min to obtain a secondary mixture;
and S3, adding the filler into the secondary mixture according to the proportion, and heating and stirring at the rotating speed of 60-70r/min for 30-60min to obtain the anti-cracking asphalt.
5. The method for preparing the cracking-resistant asphalt according to claim 4, wherein the cracking-resistant asphalt comprises the following steps: in the step S1, the temperature of the materials is 70-80 ℃ during stirring; in the step S2, the temperature of the material during stirring is 110-140 ℃; in the step S3, the temperature of the material during stirring is 120-180 ℃.
6. The method for preparing the cracking-resistant asphalt according to claim 5, wherein the cracking-resistant asphalt comprises the following steps: in the step S1, 0.3 to 0.7 part of antioxidant is dissolved in 3 to 7 parts of ethyl acetate, and then mixed into the base asphalt.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108250776A (en) * | 2018-01-08 | 2018-07-06 | 深圳市东进技术服务有限公司 | A kind of preparation method of Modified Bitumen Pavement material |
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| JP4971565B2 (en) * | 2001-08-24 | 2012-07-11 | 新日鐵化学株式会社 | Asphalt / epoxy resin composition |
| CN101275017A (en) * | 2007-03-30 | 2008-10-01 | 上海群康沥青科技有限公司 | Asphalt |
| CN101629011B (en) * | 2009-07-27 | 2011-08-31 | 中国林业科学研究院林产化学工业研究所 | Thermosetting epoxy bitumen material for roads and bridges and preparation method thereof |
| JP6632969B2 (en) * | 2013-04-22 | 2020-01-22 | エトクス ケミカルズ リミテッド ライアビリティ カンパニー | Additive to resin composition for improving impact strength and flexibility |
| CN106977966A (en) * | 2017-05-09 | 2017-07-25 | 江苏中路交通科学技术有限公司 | A kind of cold mixing cold-application type epoxy modified asphalt material and preparation method thereof |
| CN110922770B (en) * | 2018-09-20 | 2021-11-09 | 中国石油化工股份有限公司 | Modified epoxy asphalt particles and preparation and application thereof |
| PL240496B1 (en) * | 2018-10-08 | 2022-04-19 | Politechnika Gdanska | Polymer-bitumens modified with rubber waste, method of preparing polymer-bitumens and a modifying agent for bitumens |
| CN110713362B (en) * | 2019-12-12 | 2020-06-02 | 湖南鑫长胜材料科技有限公司 | Normal-temperature asphalt mixture and preparation method thereof |
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| CN108250776A (en) * | 2018-01-08 | 2018-07-06 | 深圳市东进技术服务有限公司 | A kind of preparation method of Modified Bitumen Pavement material |
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