CN113214667A - Modified asphalt and preparation method thereof - Google Patents
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- CN113214667A CN113214667A CN202110603074.4A CN202110603074A CN113214667A CN 113214667 A CN113214667 A CN 113214667A CN 202110603074 A CN202110603074 A CN 202110603074A CN 113214667 A CN113214667 A CN 113214667A
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention provides modified asphalt and a preparation method thereof, wherein the modified asphalt comprises the following components in parts by weight: 125-150 parts of matrix asphalt, 15-50 parts of rubber powder, 5-10 parts of furfural extract oil, 5-15 parts of epoxy resin, 5-10 parts of diluent, 3-8 parts of curing agent and 6-12 parts of stabilizer. The invention realizes the effective combination of the rubber powder, the furfural extract oil, the epoxy resin, the diluent and the curing agent, and the prepared modified asphalt is not easy to delaminate, has good compactness and flatness and excellent pavement performance, can be directly used for road pavement, and is suitable for industrial production.
Description
Technical Field
The invention relates to the technical field of asphalt, in particular to modified asphalt and a preparation method thereof.
Background
Asphalt is widely applied in road engineering, but the asphalt has the defects of unstable performance and easy softening, and the service life of an asphalt pavement is influenced. Therefore, modifying asphalt to improve its performance has become an urgent requirement for road construction. The properties of the asphalt or asphalt mixture can be improved by external additives (modifiers) such as rubber, resin, high molecular weight polymer, ground rubber powder or other fillers, or by "light oxidative processing of the asphalt".
The matrix asphalt is a weak-polarity or non-polar substance, the polarity of the epoxy resin is extremely strong, the polarity difference of the epoxy resin and the epoxy resin is large, and the problems of poor compatibility, influenced toughness of the epoxy asphalt and the like can occur when the epoxy asphalt is modified, so that the compatibility of a system is further improved by adding the waste rubber powder or the SBS modifier, and the flexibility of the epoxy resin is improved. However, the composite modification by adding various additives usually causes the modified asphalt to have the phenomenon of layered segregation in different degrees, and the modification effect of the polymer modifier is difficult to play, thereby affecting the road performance of the modified asphalt. Therefore, in the prior art, a solubilizer, a cross-linking agent and the like are added to improve the compatibility and the adhesion of the asphalt and the modifier, but a reaction kettle and a reaction tank are usually used for modifying the asphalt with various additives, so that the production process is complex, the operation is difficult to control, and the energy consumption is high.
The property of the asphalt material converted from thermoplastic to thermosetting requires the addition of a specific curing agent to realize the reaction of the epoxy resin and the curing agent to form sufficient mechanical strength, but the curing reaction is easily influenced by receptor systems. The waste rubber powder is not easy to dissolve and melt in the asphalt, special additives are needed to improve the infiltration capacity of the rubber powder to a certain extent, and the rubber powder modified epoxy asphalt is enhanced, so that the asphalt is structurally changed in the modification process to form a stable colloid dispersion system. When the rubber powder is used for modifying the asphalt, the viscosity is increased, and a viscosity reducer is usually added to reduce the viscosity of the rubber powder asphalt, so that the viscosity of the asphalt at high temperature is within a reasonable range. However, the density difference between the selected modifier, cross-linking agent, compatilizer, viscosity reducer and the like and the matrix asphalt is large, so that a complex network structure is formed inside the modified asphalt, and the conditions of difficult mixing and difficult compaction are caused when the modified asphalt is used.
Disclosure of Invention
Therefore, the modified asphalt prepared by the invention has the advantages of reasonable viscosity, easiness in construction, ideal mixing, good elastic recovery rate, certain flexibility and excellent pavement performance, can be directly used for road pavement, and is suitable for industrial production.
The technical scheme of the invention is realized as follows:
the invention provides modified asphalt, which comprises the following raw materials in parts by weight: 125-150 parts of matrix asphalt, 15-50 parts of rubber powder, 5-10 parts of furfural extract oil, 5-15 parts of epoxy resin, 5-10 parts of diluent, 3-8 parts of curing agent and 6-12 parts of stabilizer.
Further, the rubber powder is prepared by crushing and grinding waste tires, and the mesh number is 30-50 meshes.
Further, the diluent is prepared by mixing 1-3 parts by weight of ethylene glycol diglycidyl ether, 2-4 parts by weight of epoxypropane butyl ether and 2-4 parts by weight of xylene.
Further, the curing agent is prepared by mixing 0.5-4 parts by weight of polyetheramine, 1-3 parts by weight of diethylenetriamine and 0.5-1 part by weight of triethylamine.
Further, the stabilizer is a silicone.
A preparation method of modified asphalt comprises the following steps:
s1, weighing the raw materials according to the weight part ratio of the formula, heating and melting the matrix asphalt at 160-190 ℃, and adding rubber powder and furfural extract oil in the heating process to obtain a mixed solution 1, wherein the adding amount of the rubber powder is 40-60% of the weight of the formula;
s2 shearing the mixed solution 1 at a shearing rate of 3000-6000 rpm for 40-80 min, mixing the epoxy resin and the diluent, adding the mixed solution 1, and uniformly stirring for the first time while adding, wherein the first stirring rate is regulated as follows: stirring is started at the speed of 250r/min, the stirring speed is increased to 1000r/min within 10 minutes, and finally the mixture is stirred for 5-10 min at the speed of 1500r/min, the stirring temperature is controlled to be 50-120 ℃, a stabilizer is added for second stirring, the second stirring speed is 2500r/min, and the mixture is stirred for 15-25 min, so that a mixed solution 2 is obtained;
s3, continuously heating the mixed solution 2 to 220 ℃, then starting high-speed shearing, heating to 250 ℃, and ending shearing, wherein the shearing speed is 5000-8000 rpm; after the solution is swelled for 30-45 min, adding a curing agent and the balance of rubber powder, and standing for 20-40 min to obtain a mixed solution 3;
s4, stirring the mixed solution 3 at a stirring speed of 400-700 rpm for 60-100 min, and developing for 2-3 h to obtain the modified asphalt.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, rubber powder, furfural extract oil, epoxy resin, diluent and curing agent are effectively combined, and the prepared modified asphalt is not easy to delaminate, has good compactness and flatness, excellent pavement performance, reasonable viscosity and ideal mixing, can be directly used for road paving, and is suitable for industrial production.
The invention selects the epoxy resin, and matches with the diluent and the curing agent, so that the prepared modified asphalt has good flexibility and is easy to mix and compact. The thinner is used together with the epoxy resin, so that the viscosity of a resin system can be reduced in a high-temperature range, and the compatibility of the resin with other systems is improved. Furfural can be used as an active diluent of epoxy resin, and furfural polymerization and epoxy resin curing can form an interpenetrating network, so that the fluidity and flexibility of a system are increased, and the blending of a modified asphalt mixture and the compaction and pavement leveling in road paving are facilitated. The curing agent and epoxy resin are subjected to catalytic polymerization reaction, and a stable colloid dispersion system is formed through shearing and heating processes.
The matrix asphalt is absorbed by furfural extract oil and is fully swelled, so that rubber powder is uniformly dispersed in an asphalt system, and the organosilicon can enhance the interfacial force among the components and cause the components in the modified asphalt system to interact to generate crosslinking. By heating and high-speed shearing, the epoxy resin, the diluent and the stabilizer are fully dissolved in the asphalt, and finally the curing agent, the rubber powder and the triethylamine are added to further improve the curing reaction rate, so that the curing reaction produces a reticular homopolymer, the additive and the asphalt system are promoted to form a three-dimensional reticular cross-linked structure, and the problem that the modified asphalt is easy to separate layers and isolate is solved. The curing agent, the epoxy resin and the diluent are added separately, so that the phenomenon that the lower layer is agglomerated and the upper layer is softer in a curing reaction is avoided, and a stable colloid dispersion system cannot be formed. According to the invention, the rubber powder is added twice, so that on one hand, the effect of the rubber powder modified epoxy resin is improved, and on the other hand, the rubber powder is added in the curing reaction, so that the stability of the powder is improved, and the road performance of the modified asphalt is further improved.
The preparation process is simple, the operation and the control are easy, the prepared rubber powder modified asphalt has better stability, namely the modified asphalt does not generate the layering phenomenon in the using process and is easy to mix and compact, and the cementing material has good performance indexes, can be directly used for road paving and is suitable for industrial production.
Detailed Description
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the invention.
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified.
The materials, reagents and the like used in the examples of the present invention can be obtained commercially without specific description.
Example 1
The modified asphalt comprises the following raw materials in parts by weight: 125kg of matrix asphalt, 15kg of 50-mesh rubber powder, 5kg of furfural extract oil, 5kg of epoxy resin, 5kg of diluent, 3kg of curing agent and 6kg of silicone resin (stabilizer); the diluent is formed by mixing 1kg of ethylene glycol diglycidyl ether, 2kg of epoxypropane butyl ether and 2kg of dimethylbenzene; the curing agent is prepared by mixing 1kg of polyether amine, 1.5kg of diethylenetriamine and 0.5kg of triethylamine.
Example 2
The modified asphalt comprises the following raw materials in parts by weight: 150kg of matrix asphalt, 50kg of 40-mesh rubber powder, 10kg of furfural extract oil, 15kg of epoxy resin, 10kg of diluent, 8kg of curing agent and 12kg of silicone resin (stabilizer); the diluent is formed by mixing 3kg of ethylene glycol diglycidyl ether, 3kg of epoxypropane butyl ether and 4kg of dimethylbenzene; the curing agent is prepared by mixing 4kg of polyether amine, 3kg of diethylenetriamine and 1kg of triethylamine.
Example 3
The modified asphalt comprises the following raw materials in parts by weight: 140kg of matrix asphalt, 35kg of 35-mesh rubber powder, 8kg of furfural extract oil, 12kg of epoxy resin, 8kg of diluent, 6kg of curing agent and 8kg of silicone resin (stabilizer); the diluent is formed by mixing 1.5kg of ethylene glycol diglycidyl ether, 3kg of epoxypropane butyl ether and 3.5kg of dimethylbenzene; the curing agent is prepared by mixing 3kg of polyether amine, 2.2kg of diethylenetriamine and 0.8kg of triethylamine.
The preparation method of the raw material of the modified asphalt according to the embodiments 1 to 3 comprises the following steps:
s1, weighing raw materials according to the formula weight, heating and melting the matrix asphalt at 190 ℃, and adding rubber powder and furfural extract oil in the heating process to obtain mixed liquid 1, wherein the adding amount of the rubber powder is 40% of the formula weight;
s2, shearing the mixed solution 1 at a shearing rate of 3000rpm for 40min, adding the epoxy resin and the diluent after mixing, uniformly stirring for the first time while adding, wherein the first stirring rate is regulated as follows: stirring at 250r/min, increasing the stirring speed to 1000r/min within 10min, and finally stabilizing the stirring at 1500r/min for 5min at the stirring temperature of 50 ℃; adding a stabilizer for secondary stirring, wherein the stirring speed is 2500r/min, and stirring for 15 min; obtaining a mixed solution 2;
s3, continuously heating the mixed solution 2 to 220 ℃, then starting high-speed shearing, heating to 250 ℃, ending shearing, wherein the shearing speed is 5000 rpm; after the solution is swelled for 30min, adding a curing agent and the balance of rubber powder to obtain a mixed solution 3;
s4, stirring the mixed solution 3 at the stirring speed of 700rpm for 100min, and developing for 3h to obtain the modified asphalt.
Example 4
A modified asphalt, which has the same raw material as that of example 3, is prepared by the following steps:
s1, weighing the raw materials according to the formula weight, heating and melting the matrix asphalt at 175 ℃, adding rubber powder and furfural extract oil in the heating process, and mixing to obtain a mixed solution 1, wherein the adding amount of the rubber powder is 50% of the formula weight;
s2 shearing the mixed solution 1 at a shearing rate of 4500rpm for 65min, mixing the epoxy resin and the diluent, adding the mixed solution 1, and uniformly stirring for the first time while adding, wherein the first stirring rate is regulated as follows: starting stirring at the speed of 250r/min, increasing the stirring speed to 1000r/min within 10 minutes, and finally stabilizing the stirring at 1500r/min for 10min, wherein the stirring temperature is 80 ℃; adding a stabilizer for secondary stirring, wherein the stirring speed is 2500r/min, and stirring for 20 min; obtaining a mixed solution 2;
s3, continuously heating the mixed solution 2 to 220 ℃, then starting high-speed shearing, heating to 250 ℃, and ending shearing, wherein the shearing rate is 7000 rpm; after the solution swells for 40min, adding a curing agent and the balance of rubber powder to obtain a mixed solution 3;
s4, stirring the mixed solution 3 at a stirring speed of 600rpm for 85min, and developing for 2.5h to obtain the modified asphalt.
Example 5
The difference between this example and example 4 is that in the step S2, the curing agent is mixed with the epoxy resin and the diluent and then added into the mixed solution 1, and in the step S3, the curing agent is not added; the rest of the procedure was the same as in example 4.
Example 6
This example differs from example 4 in that 35kg of rubber powder was added in the step of S1, and only the curing agent was added in the step of S3; the rest of the procedure was the same as in example 4.
Comparative example 1
Modified bitumen according to example 4, with the difference that: raw materials of modified asphalt, 20kg of epoxy resin and 19kg of diluent; the diluent is prepared by mixing 4kg of ethylene glycol diglycidyl ether, 6kg of epoxypropane butyl ether and 9kg of xylene.
Comparative example 2
Modified bitumen according to example 4, with the difference that: raw materials of modified asphalt, namely 12kg of furfural extract oil and 13kg of curing agent; the curing agent is prepared by mixing 6kg of polyether amine, 4kg of diethylenetriamine and 3kg of triethylamine.
Comparative example 3
Modified bitumen according to example 4, with the difference that: raw materials of modified asphalt by weight, 13 parts of curing agent; the curing agent is prepared by mixing 7kg of polyether amine, 5.8kg of diethylenetriamine and 0.2kg of triethylamine.
Comparative example 4
Modified bitumen according to example 4, with the difference that: raw materials of modified asphalt, namely 12kg of furfural extract oil, 18kg of epoxy resin and 13kg of curing agent; the curing agent is prepared by mixing 6kg of polyether amine, 4kg of diethylenetriamine and 3kg of triethylamine.
Comparative example 5
A modified asphalt preparation method according to example 4, which is different in that: 180kg of matrix asphalt, 55kg of rubber powder, 12kg of furfural extract oil and 20kg of epoxy resin.
1. Test experiment 1
The modified asphalt prepared in examples 1 to 6 and comparative examples 1 to 5 were subjected to an experimental test according to the relevant regulations of the test procedure for road engineering asphalt and asphalt mixture (JTG E20-2011), and a WDW-20E microcomputer-controlled electronic universal tester was used to perform a tensile property test, and 5 test pieces per group were averaged.
Determination method of elongation at break: a) after paraffin is melted, uniformly coating a layer on an aluminum plate, and airing for later use; b) uniformly coating the evaporation residues of the modified asphalt on an aluminum plate, wherein the coating area is 100mm multiplied by 50mm, the thickness is 1.5mm, and finally, scraping the surface at 25 ℃ and maintaining for 120 h; c) test pieces for the test were prepared using a dumbbell cutter.
d) Adjusting the distance between the clamps of the tensile testing machine to be about 70mm, clamping the test piece on the testing machine, keeping the center line of the time length direction and the center of the clamp of the testing machine on the same line, and stretching at the speed of 30/mm/min until the test piece is broken; e) and recording the distance between the maximum load and the breaking time mark line during the test breaking, wherein the distance is accurate to 0.1mm, and if the test piece breaks outside the marking line, the test piece is abandoned for supplementary measurement.
Elongation at break εt＝[(L-L0)/L0]X 100%, wherein L0The effective distance between the initial mark lines of the test piece is mm; and L is the effective distance between the time marks of the breakage of the test piece, namely mm.
The test results are shown in table 1 below:
TABLE 1 Experimental test results for modified Pitch
The table shows that the viscosity of the modified asphalt prepared in the embodiments 1 to 4 is controlled within the range of 2 to 4Ps s at 175 ℃, the modified asphalt is easy to construct, ideal in mixing and good in elastic recovery rate, the difference between the softening points of 72 hours and the upper softening point of the modified asphalt is below 5 ℃, the elongation at break is a middle value, the modified asphalt has certain flexibility, and pavement cracks can be reduced. Example 5 adding the curing agent first, it can be seen that the modified asphalt system has poor compatibility, the segregation degree reaches 10.3 ℃, and the viscosity also has a high value; example 6 rubber powder was added at one time, and the modified asphalt obtained was poor in elastic recovery, large in elongation at break, and unable to have good flexibility.
Compared with the comparative examples 1-5, the elongation at break of the comparative example 1 is lower, which shows that the segregation degree is correspondingly increased by increasing the weight parts of the epoxy resin and the diluent, the elongation at break is lower, the material is easily embrittled by adding too much epoxy resin, and the strength of the modified asphalt is reduced to a certain extent; the comparative example 2 simultaneously increases the weight parts of the furfural extract oil and the curing agent, has high elongation at break and higher resolution, and shows that the increase of the components is not beneficial to the stability of the modified asphalt; the comparative example 3 reduces the addition of triethylamine, the epoxy resin and the curing agent react slowly, and the viscosity and the resolution of the prepared modified asphalt are higher in the same preparation time; compared with the prior art, the method has the advantages that furfural extract oil, epoxy resin and curing agent are added simultaneously, the viscosity is very high, and the elastic recovery degree is lowest; comparative example 5 performed poorly in all respects.
2. Test experiment 2
The modified asphalt of the embodiments 1 to 6 and the comparative examples 1 to 5 is mixed with aggregate according to the oilstone ratio of 6.7%, the modified asphalt mixtures of the embodiments 1 to 6 and the comparative examples 1 to 5 are prepared by adopting the conventional technical means, experimental tests are carried out according to the relevant regulations of road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), meanwhile, the mixtures are applied to road engineering according to the existing standard technology, relevant data detection is carried out, and the test results are shown in the following table 2:
TABLE 2 modified asphalt mixture and road construction test results
The above table shows that the mineral aggregate gap degree and the residual stability of the modified asphalt mixture of the embodiments 1 to 4 are reasonable, and the compactness, the flatness and the water permeability coefficient of the road building stage test all meet the requirements, so that the modified asphalt prepared by the embodiments 1 to 4 can be directly used for road pavement, has excellent pavement performance, and is suitable for industrial production. Example 5 has higher flatness, example 6 has lower compaction, higher water permeability coefficient and poorer pavement performance.
Comparative example 1 has a higher flatness, while increasing the amount of epoxy resin and diluent further increases the flatness; the water permeability coefficient of the comparative example 2 is the highest, which shows that the waterproof stability of the system cannot be improved by adding the furfural extract oil and the curing agent simultaneously, and the mineral aggregate clearance rate and the compactness are lower; comparative example 3, the residual stability is lower, which shows that the residual stability of the mixture can be further improved by adding triethylamine; the mineral aggregate of the comparative example 4 has low clearance rate, which is not beneficial to the compaction of the mixture; the road surface properties of comparative example 5 are not ideal in all respects.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The modified asphalt is characterized by comprising the following raw materials in parts by weight: 125-150 parts of matrix asphalt, 15-50 parts of rubber powder, 5-10 parts of furfural extract oil, 5-15 parts of epoxy resin, 5-10 parts of diluent, 3-8 parts of curing agent and 6-12 parts of stabilizer.
2. The modified asphalt according to claim 1, wherein the rubber powder is obtained by crushing waste tires and then grinding the crushed waste tires, and the mesh number of the rubber powder is 30-50 meshes.
3. The modified asphalt of claim 1, wherein: the diluent is prepared by mixing 1-3 parts by weight of ethylene glycol diglycidyl ether, 2-4 parts by weight of epoxypropane butyl ether and 2-4 parts by weight of xylene.
4. The modified asphalt of claim 1, wherein: the curing agent is prepared by mixing 0.5-4 parts by weight of polyetheramine, 1-3 parts by weight of diethylenetriamine and 0.5-1 part by weight of triethylamine.
5. The modified asphalt of claim 1, wherein: the stabilizer is an organic silicon stabilizer.
6. A method for producing a modified asphalt according to any one of claims 2 to 5, characterized in that: the method comprises the following steps:
s1, weighing the raw materials according to the weight part ratio of the formula, heating the matrix asphalt to 160-190 ℃ for melting, and adding rubber powder and furfural extract oil in the heating process to obtain a mixed solution 1, wherein the adding amount of the rubber powder is 40-60% of the weight of the formula;
s2, shearing the mixed solution 1, mixing the epoxy resin and the diluent, adding the mixed solution 1, stirring for the first time while adding, adding the stabilizer, and stirring for the second time to obtain a mixed solution 2;
s3, continuously heating the mixed solution 2, shearing at a high speed, adding a curing agent and the balance of rubber powder after swelling, and standing for 20-40 min to obtain a mixed solution 3;
s4, stirring the mixed solution 3 at a stirring speed of 400-700 rpm for 60-100 min, and developing for 2-3 h to obtain the modified asphalt.
7. The process for producing modified asphalt according to claim 6, wherein: in the step S2, the mixed solution 1 is sheared for 40-80 min at a shearing rate of 3000-6000 rpm; the speed regulation and control of the first stirring are as follows: stirring is started at the speed of 250r/min, the stirring speed is increased to 1000r/min within 10 minutes, the stirring is finally stabilized at 1500r/min for 5-10 min, and the stirring temperature is controlled at 50-120 ℃; the second stirring speed is 2500r/min, and the stirring is carried out for 15-25 min.
8. The process for producing modified asphalt according to claim 6, wherein: in the step S3, the mixed solution 2 is continuously heated to 220 ℃ and then high-speed shearing is carried out, the temperature is heated to 250 ℃ and shearing is finished, the shearing rate is 5000-8000 rpm, and after the solution swells for 30-45 min, the curing agent and the balance of rubber powder are added.
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| CN115160811A (en) * | 2022-08-13 | 2022-10-11 | 东南大学 | Super-toughness environment-friendly epoxy desulfurized rubber powder modified asphalt |
| CN115246997A (en) * | 2022-01-13 | 2022-10-28 | 浙江理工大学 | Epoxy asphalt cement for asphalt old material regeneration and preparation method thereof |
| CN115838528A (en) * | 2022-11-02 | 2023-03-24 | 浙江交通资源投资集团有限公司沥青科技分公司 | High-temperature shear-resistant epoxy asphalt and preparation method thereof |
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| CN115246997B (en) * | 2022-01-13 | 2023-10-20 | 浙江理工大学 | Epoxy asphalt cement for recycling old asphalt and preparation method thereof |
| CN115160811A (en) * | 2022-08-13 | 2022-10-11 | 东南大学 | Super-toughness environment-friendly epoxy desulfurized rubber powder modified asphalt |
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