CN112159597A - Low-viscosity modified rubber asphalt and preparation method thereof - Google Patents
Low-viscosity modified rubber asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention discloses low-viscosity modified rubber asphalt and a preparation method thereof. The low-viscosity modified rubber asphalt comprises, by weight, 78-85 parts of modified asphalt, 10-17 parts of activated rubber powder, 12-15 parts of styrene-butadiene-styrene block copolymer and 12-15 parts of softening oil. Hydrogen peroxide, ferrous sulfate, polyvinylpyrrolidone and microwave radiation are combined to carry out activation treatment on the waste tire rubber powder, so that vulcanized rubber on the surface of the rubber powder is depolymerized, the adhesiveness and the compatibility of the rubber powder and a matrix are improved, the rubber powder can be uniformly dispersed in asphalt molecules, light components in the asphalt molecules are adsorbed, and a bonding structure is formed by swelling; the matrix asphalt is modified by using the expanded graphite, the tetrabutyl titanate, the glacial acetic acid and the silicone oil, so that the thermal stability of the asphalt can be improved, and the smoke release can be reduced. After the modification reaction, the finally prepared modified rubber asphalt has the characteristics of low viscosity, low odor and high thermal stability.
Description
Technical Field
The invention relates to the technical field of rubber asphalt, in particular to low-viscosity modified rubber asphalt and a preparation method thereof.
Background
The rubber asphalt is a modified asphalt cementing material which is formed by processing the raw materials of waste tires into rubber powder, combining the rubber powder according to a certain thickness proportion, adding a plurality of high polymer modifiers, and fully melting and swelling the rubber powder and the matrix asphalt under the condition of fully blending at high temperature (above 180 ℃). The rubber asphalt has larger elasticity and elasticity recovery capability at high temperature, and can improve the deformation resistance and fatigue cracking resistance of the pavement; the asphalt has better high and low temperature performance, and reduces the sensitivity of the asphalt to temperature; has the characteristics of high viscosity, aging resistance, strong oxidation resistance and the like; the antiskid function is strong, the water splashing of the vehicle in rainy days is reduced, the visual field is improved, the noise is reduced, and the safety and the comfort of the vehicle on the road surface are greatly improved; the rubber asphalt uses waste tire rubber as a raw material, so that the preparation of the rubber asphalt is beneficial to environmental protection, natural resources are saved, and the living environment of human is improved, so that the rubber asphalt is widely applied at present. However, the existing rubber asphalt has high viscosity at high temperature, so that the difficulty of asphalt spreading and pavement compaction is increased, the processing equipment is complex and is not easy to store stably for a long time, the long-term use of the pavement is not facilitated, and the consumed rubber quantity is large.
Therefore, the low-viscosity rubber asphalt is produced by transportation, and the low-viscosity asphalt promotes vulcanized rubber powder to fully generate desulfurization and depolymerization reactions in matrix asphalt by reducing the using amount of the rubber powder and adopting a high-strength treatment process or chemical modification to reduce the vulcanized rubber powder into the reclaimed rubber in a plastic state, so that the viscosity of the binder is greatly reduced; low viscosity rubber asphalts also have better resistance to transmission cracking and fatigue cracking and are therefore a very interesting paving material. But the reduction of the viscosity of the rubber asphalt also causes the reduction of the thermal stability of the asphalt binder, and the high-temperature performance of the low-viscosity rubber asphalt is lower than that of the high-temperature performance of the high-viscosity rubber asphalt under the same condition; therefore, the development of low-viscosity rubber asphalt with higher thermal stability and lower viscosity is required.
Disclosure of Invention
The invention aims to provide low-viscosity modified rubber asphalt and a preparation method thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the low-viscosity modified rubber asphalt comprises, by weight, 78-85 parts of modified asphalt, 10-17 parts of activated rubber powder, 12-15 parts of styrene-butadiene-styrene block copolymer and 12-15 parts of softening oil.
Further, the modified asphalt is prepared from base asphalt and a modifier.
Furthermore, the activated rubber powder is mainly prepared by reacting waste tire rubber powder, hydrogen peroxide, ferrous sulfate and polyvinylpyrrolidone.
Further, the modifier is prepared from expanded graphite, hydrogen peroxide and silicone oil. The expansion volume of the expanded graphite is more than or equal to 400ml/g, the ash content is less than 0.2%, the water content is less than 3%, and the oxidability is less than 35mg/g ∙ h.
Further, the mass ratio of the matrix asphalt to the modifier is 1: 0.008-0.03.
Further, the matrix asphalt is any one of 70#, 90#, and 200 #.
Further, the particle size of the waste tire rubber powder is 40-80 meshes.
Further, the softening oil is any one or more of castor oil, aromatic oil, naphthenic oil, furfural oil and rubber filling oil.
A preparation method of low-viscosity modified rubber asphalt comprises the following steps;
(1) preparing activated rubber powder:
(2) preparing modified asphalt:
(3) and preparing a finished product of the viscosity modified rubber asphalt.
Further, a preparation method of the low-viscosity modified rubber asphalt comprises the following steps;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation; adding 30% hydrogen peroxide solution and ferrous sulfate, reacting, filtering, and drying; adding a polyvinylpyrrolidone solution, stirring, heating to 75-80 ℃, and reacting for 15-20 min; performing microwave irradiation to obtain activated rubber powder;
(2) preparing modified asphalt: mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed, and reacting; adding expanded graphite, heating to 50-55 ℃, and reacting; heating to 78-82 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier;
heating the matrix asphalt at 185-190 ℃, stirring, and adding a modifier; shearing at high speed to obtain modified asphalt;
(3) preparing a low-viscosity modified rubber asphalt finished product; mixing the modified asphalt and the softening oil, stirring and developing; adding the activated rubber powder prepared in the step (1) and a styrene-butadiene-styrene block copolymer, and stirring; heating to 180-190 ℃; shearing at a high speed, heating to 205-225 ℃, stirring at a high speed, keeping constant temperature, and developing; obtaining the finished product of the low-viscosity modified rubber asphalt.
The surface of the waste tire rubber powder is treated by microwaves, and cross-linking bonds, sulfur-sulfur bonds and carbon-sulfur bonds on the surface of rubber powder molecules are broken and broken under the radiation action of the microwaves; after the cross-linking bond is broken, the three-dimensional cross-linking network structure of the rubber molecule is depolymerized, so that the interface affinity, the adhesion and the compatibility of the rubber powder molecule and a matrix are improved, and the phenomenon that the adhesion of a system is increased due to the agglomeration of a rubber powder vulcanization structure is relieved. But the damage of the single physical microwave radiation to the cross-linking bond of the rubber powder is limited, and the structure of the rubber powder vulcanized rubber can not be thoroughly depolymerized; therefore, the proposal further uses hydrogen peroxide solution to react with the rubber after microwave treatment, and performs carboxylation reaction on the surface of the rubber molecule; ferrous sulfate can be used as catalyst to improve the oxidation effect and oxidation performance of hydrogen peroxide, and in addition, the ferrous sulfate forms sulfate radical free radical SO in the system4 -1; sulfate radicals can be oxidized and degraded freely to inhibit fluoranthene, a toxic polycyclic substance in the asphalt, so that the smoke release of the rubber asphalt is reduced. Introducing amphiphilic high molecular polyvinylpyrrolidone with its hydrophilic end being in phase with rubber powder surfaceThe oleophilic end is compatible with the asphalt, and a bridge function is formed between the rubber powder and the asphalt, so that the dispersibility and compatibility of the rubber powder in the asphalt are improved. Finally, microwave activation treatment is used for further enhancing the activity of the rubber powder; the rubber powder prepared by the step-by-step reaction has activity, and has enhanced compatibility with a matrix interface and reduced adhesion.
The expanded graphite is a high polymer material with strong high temperature resistance, and can enhance the thermal stability of a system when added into rubber asphalt; when the temperature of the system rises, the expanded graphite porous intercalation structure is heated and vaporized to form a supporting force for the sheet layer, so that the expanded graphite sheet layer is expanded, and the viscosity of the asphalt system is favorably reduced;
the specific porous intercalation structure of the expanded graphite can effectively adsorb polycyclic aromatic hydrocarbons such as anthracene and phenanthrene substances generated in a system, but the adsorption is a physical adsorption process, and only the polycyclic aromatic hydrocarbons are transferred and not eliminated, so that the adsorption effect is very limited; titanium dioxide has photocatalytic oxidation, and when the titanium dioxide is directly added into asphalt, agglomeration occurs, so that the catalytic efficiency is low. According to the scheme, the titanium dioxide modified expanded graphite is prepared by reacting expanded graphite, tetrabutyl titanate, glacial acetic acid and silicone oil; when the titanium dioxide of the titanium dioxide modified expanded graphite is illuminated, a photocatalytic oxidation reaction can be carried out, and organic matters such as polycyclic aromatic hydrocarbon and the like in the asphalt are removed through oxidation; therefore, the release of polycyclic aromatic hydrocarbon, namely smoke in the rubber asphalt is greatly reduced. The addition of silicone oil can promote defoaming of the base asphalt.
The styrene-butadiene-styrene block copolymer has excellent thermal stability, and enhances the thermal stability of the rubber asphalt together with the activated rubber powder and the modified asphalt; the softening oil serves as a filler for the system and may assist in reducing the viscosity of the rubberized asphalt.
Further, the preparation method of the low-viscosity modified rubber asphalt is characterized by comprising the following steps: comprises the following steps;
(1) taking waste tire rubber powder, and performing microwave irradiation for 60-100 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 2-3 h, filtering and drying; adding a polyvinylpyrrolidone solution, stirring, heating to 75-80 ℃, and reacting for 15-20 min; performing microwave irradiation for 25-30 s; obtaining activated rubber powder;
(2) mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed of 1500r/min at the stirring speed of 1000-; adding expanded graphite, heating to 50-55 deg.C, and reacting for 30-40 min; heating to 78-82 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier;
heating the matrix asphalt at 185-190 ℃, stirring, and adding a modifier; shearing at a high speed, wherein the shearing speed is 3000-4000 r/min, and the shearing time is 40-60 min; preparing modified asphalt;
(3) mixing the modified asphalt and the softening oil, stirring, and developing for 30-40 min; adding the activated rubber powder prepared in the step (1) and a styrene-butadiene-styrene block copolymer, and stirring; heating to 180-190 ℃; shearing at a high speed of 3500-5000 r/min for 20-40 min; heating to 205-225 ℃, stirring at high speed for 40-50 min; keeping the temperature constant, and developing for 10-20 min; the low-viscosity modified rubber asphalt is prepared.
Compared with the prior art, the invention has the following beneficial effects: the method utilizes the combination of hydrogen peroxide, ferrous sulfate, polyvinylpyrrolidone and microwave radiation to activate the waste tire rubber powder, depolymerizes vulcanized rubber on the surface of the rubber powder, and improves the adhesion and compatibility of the rubber powder and a substrate; can be uniformly dispersed in molecules, uniformly adsorb light components in asphalt molecules, and swell to form a bonding structure; and the matrix asphalt is modified by using expanded graphite, tetrabutyl titanate, glacial acetic acid and silicone oil, so that the thermal stability of the asphalt is improved, and the smoke release in the rubber asphalt is reduced. After the modification reaction, the finally prepared rubber asphalt has low viscosity, good thermal stability and low smell; has wide application space.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1
The low-viscosity modified rubber asphalt comprises the following raw materials, by weight, 78 parts of modified asphalt, 10 parts of activated rubber powder, 12 parts of styrene-butadiene-styrene block copolymer and 12 parts of softening oil.
Wherein the mass ratio of the matrix asphalt to the modifier is 1: 0.008; the particle size of the waste tire rubber powder is 40 meshes; the softening oil is aromatic oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 60 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 2 hours, filtering and drying; adding polyvinylpyrrolidone solution, stirring, heating to 75 ℃, and reacting for 15 min; microwave irradiation for 25 s; obtaining activated rubber powder;
(2) mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed, wherein the stirring speed is 1000r/min, and reacting for 40 min; adding expanded graphite, heating to 50 ℃, and reacting for 30 min; heating to 78-82 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier;
heating the matrix asphalt at 185 ℃, stirring, and adding the modifier; shearing at high speed, wherein the shearing speed is 3000r/min, and the shearing time is 40 min; preparing modified asphalt;
(3) mixing the modified asphalt and aromatic oil, stirring, and developing for 30 min; adding the activated rubber powder prepared in the step (1) and a styrene-butadiene-styrene block copolymer, and stirring; heating to 180 ℃; shearing at high speed, wherein the shearing speed is 3500r/min and 20 min; heating to 205 deg.C, stirring at high speed for 40 min; maintaining constant temperature, and developing for 10 min; the low-viscosity modified rubber asphalt is prepared.
Example 2
The low-viscosity modified rubber asphalt comprises, by weight, 82 parts of modified asphalt, 14 parts of activated rubber powder, 13 parts of styrene-butadiene-styrene block copolymer and 13 parts of softening oil.
Wherein the mass ratio of the matrix asphalt to the modifier is 1: 0.01; the particle size of the waste tire rubber powder is 60 meshes; the softening oil is furfural oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 60 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 2 hours, filtering and drying; adding polyvinylpyrrolidone solution, stirring, heating to 75 ℃, and reacting for 15 min; microwave irradiation for 25 s; obtaining activated rubber powder;
(2) mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed of 1270r/min, and reacting for 49 min; adding expanded graphite, heating to 52 ℃, and reacting for 35 min; heating to 81 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier;
heating the matrix asphalt at 188 ℃, stirring, and adding the modifier; shearing at high speed, wherein the shearing speed is 3070r/min, and the shearing time is 50 min; preparing modified asphalt;
(3) mixing modified asphalt and furfural oil, stirring, and developing for 36 min; adding the activated rubber powder prepared in the step (1) and a styrene-butadiene-styrene block copolymer, and stirring; heating to 186 ℃; shearing at high speed of 4250r/min for 27 min; heating to 213 deg.C, stirring at high speed for 41 min; maintaining constant temperature, and developing for 13 min; the low-viscosity modified rubber asphalt is prepared.
Example 3
The low-viscosity modified rubber asphalt comprises the following raw materials, by weight, 85 parts of modified asphalt, 17 parts of activated rubber powder, 15 parts of styrene-butadiene-styrene block copolymer and 15 parts of softening oil.
Wherein the mass ratio of the matrix asphalt to the modifier is 1: 0.03; the particle size of the waste tire rubber powder is 80 meshes; the softening oil is a mixture of naphthenic oil and aromatic oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 100 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 3h, filtering and drying; adding polyvinylpyrrolidone solution, stirring, heating to 80 deg.C, and reacting for 20 min; microwave irradiation for 30 s; obtaining activated rubber powder;
(2) mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed of 1500r/min, and reacting for 60 min; adding expanded graphite, heating to 55 ℃, and reacting for 40 min; heating to 82 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier;
heating the matrix asphalt, stirring at 190 ℃, and adding a modifier; shearing at high speed, wherein the shearing speed is 4000r/min, and the shearing time is 60 min; preparing modified asphalt;
(3) mixing the modified asphalt and the naphthenic oil, stirring and developing for 40 min; adding the activated rubber powder prepared in the step (1) and a styrene-butadiene-styrene block copolymer, and stirring; heating to 190 ℃; shearing at high speed, wherein the shearing speed is 5000r/min, and the shearing time is 40 min; heating to 225 deg.C, stirring at high speed for 50 min; maintaining constant temperature, and developing for 20 min; the low-viscosity modified rubber asphalt is prepared.
Comparative example 1
The low-viscosity modified rubber asphalt comprises the following raw materials, by weight, 85 parts of modified asphalt, 17 parts of activated rubber powder, 15 parts of styrene-butadiene-styrene block copolymer and 15 parts of softening oil.
Wherein the mass ratio of the matrix asphalt to the modifier is 1: 0.03; the particle size of the waste tire rubber powder is 80 meshes; the softening oil is one or more of castor oil, aromatic oil, naphthenic oil, furfural oil and rubber filling oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 100 s; adding a 30% hydrogen peroxide solution, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 3h, filtering and drying; adding polyvinylpyrrolidone solution, stirring, heating to 80 deg.C, and reacting for 20 min; microwave irradiation for 30 s; obtaining activated rubber powder;
steps (2) and (3) are the same as in example 3;
comparative example 2
The low-viscosity modified rubber asphalt comprises the following raw materials, by weight, 85 parts of modified asphalt, 17 parts of activated rubber powder, 15 parts of styrene-butadiene-styrene block copolymer and 15 parts of softening oil.
Wherein the mass ratio of the matrix asphalt to the modifier is 1: 0.03; the particle size of the waste tire rubber powder is 80 meshes; the softening oil is one or more of castor oil, aromatic oil, naphthenic oil, furfural oil and rubber filling oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 100s to obtain activated rubber powder;
steps (2) and (3) are the same as in example 3;
comparative example 3
The low-viscosity modified rubber asphalt comprises the following raw materials, by weight, 85 parts of modified asphalt, 17 parts of activated rubber powder, 15 parts of styrene-butadiene-styrene block copolymer and 15 parts of softening oil.
Wherein the mass ratio of the matrix asphalt to the modifier is 1: 0.03; the particle size of the waste tire rubber powder is 80 meshes; the softening oil is one or more of castor oil, aromatic oil, naphthenic oil, furfural oil and rubber filling oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 100 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 3h, filtering and drying; adding polyvinylpyrrolidone solution, stirring, heating to 80 deg.C, and reacting for 20 min; obtaining activated rubber powder;
steps (2) and (3) are the same as in example 3;
comparative example 4
The low-viscosity modified rubber asphalt comprises the following raw materials, by weight, 85 parts of modified asphalt, 17 parts of activated rubber powder, 15 parts of styrene-butadiene-styrene block copolymer and 15 parts of softening oil.
Wherein the particle size of the waste tire rubber powder is 80 meshes; the softening oil is one or more of castor oil, aromatic oil, naphthenic oil, furfural oil and rubber filling oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 100 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 3h, filtering and drying; adding polyvinylpyrrolidone solution, stirring, heating to 80 deg.C, and reacting for 20 min; microwave irradiation for 30 s; obtaining activated rubber powder;
(2) heating the matrix asphalt, stirring at 190 ℃, and adding titanium dioxide; shearing at high speed, wherein the shearing speed is 4000r/min, and the shearing time is 60 min; preparing modified asphalt;
step (3) is the same as in example 3.
Comparative example 5
The low-viscosity modified rubber asphalt comprises the following raw materials, by weight, 85 parts of modified asphalt, 17 parts of activated rubber powder, 15 parts of styrene-butadiene-styrene block copolymer and 15 parts of softening oil.
Wherein the mass ratio of the matrix asphalt to the modifier is 1: 0.03; the particle size of the waste tire rubber powder is 80 meshes; the softening oil is one or more of castor oil, aromatic oil, naphthenic oil, furfural oil and rubber filling oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 100 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 3h, filtering and drying; adding polyvinylpyrrolidone solution, stirring, heating to 80 deg.C, and reacting for 20 min; microwave irradiation for 30 s; obtaining activated rubber powder;
(2) mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed of 1500r/min, and reacting for 60 min; adding graphene, heating to 55 ℃, and reacting for 40 min; heating to 82 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier; heating the matrix asphalt, stirring at 190 ℃, and adding a modifier; shearing at high speed, wherein the shearing speed is 4000r/min, and the shearing time is 60 min; preparing modified asphalt;
step (3) is the same as in example 3.
Comparative example 6
The low-viscosity modified rubber asphalt comprises the following raw materials, by weight, 85 parts of modified asphalt, 17 parts of activated rubber powder, 15 parts of styrene-butadiene-styrene block copolymer and 15 parts of softening oil.
Wherein the mass ratio of the matrix asphalt to the modifier is 1: 0.03; the particle size of the waste tire rubber powder is 80 meshes; the softening oil is one or more of castor oil, aromatic oil, naphthenic oil, furfural oil and rubber filling oil.
The preparation steps are as follows;
(1) preparation of activated rubber powder: taking waste tire rubber powder, and performing microwave irradiation for 100 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 3h, filtering and drying; adding polyvinylpyrrolidone solution, stirring, heating to 80 deg.C, and reacting for 20 min; microwave irradiation for 30 s; obtaining activated rubber powder;
(2) mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed of 1500r/min, and reacting for 60 min; adding carbon nano tube, heating to 55 ℃, and reacting for 40 min; heating to 82 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier; heating the matrix asphalt, stirring at 190 ℃, and adding a modifier; shearing at high speed, wherein the shearing speed is 4000r/min, and the shearing time is 60 min; preparing modified asphalt;
step (3) is the same as in example 3.
Experimental comparison and analysis
Comparative example 1 in the process of preparing the activated rubber, the rubber powder is directly modified without adding ferrous sulfate in the activation process; the rest is the same as in example 3;
comparative example 2 in the process of preparing the activated rubber, the rubber powder is subjected to microwave activation treatment only once; the rest is the same as in example 3;
comparative example 3 in the process of preparing the activated rubber, the rubber powder is activated by microwave and hydrogen peroxide only once; the rest is the same as in example 3;
comparative example 4 in the preparation of modified asphalt, titanium dioxide was directly added instead of this scheme, and the rest of the contents were the same as in example 3.
Comparative example 5 the modified asphalt was prepared by replacing the expanded graphite with graphene, and the same procedure as in example 3 was repeated.
Comparative example 6 the same procedure as in example 3 was repeated except that carbon nanotubes were used instead of the expanded graphite in the preparation of the modified asphalt.
The low-viscosity modified rubber asphalt prepared in the examples 1 to 3 and the comparative examples 1 to 6 is subjected to performance detection, and the detection data are shown in the following table 1;
TABLE 1
As can be seen from the data in Table 1, the modified rubber asphalt prepared in examples 1-3 has a viscosity of about 2.2Pa.s at 177 ℃, and has a better softening point, elastic recovery and 25 ℃ penetration than the comparative group, and has a lower smoke volatilization amount at 180 ℃; therefore, the rubber asphalt prepared by the technical scheme of the invention has the characteristics of low viscosity, good thermal stability and low smoke release.
Compared with the embodiment 3, the comparative example 1 has the advantages that ferrous sulfate is not added, and the ferrous sulfate can catalyze hydrogen peroxide to oxidize rubber powder and generate sulfate radicals to eliminate polycyclic hydrocarbon substances in the asphalt; therefore, in the comparative example 1, the surface activity of the rubber powder is slightly low, the adhesion between the rubber powder molecules and the matrix is large, the viscosity of the prepared rubber asphalt is slightly high, and the smoke volatilization amount is increased.
Compared with the example 3, the comparative examples 2 to 3 respectively adopt the first microwave treatment of the rubber powder and the synergistic effect of the first microwave and the hydrogen peroxide for treating the rubber powder, and the example 3 adopts the first microwave plus the hydrogen peroxide plus the second microwave; as can be seen from the test data, comparative examples 2 to 3 have different degrees of reduction in viscosity and also have reduced thermal stability; therefore, the rubber powder is subjected to primary microwave, hydrogen peroxide activation and secondary microwave treatment in the scheme, so that the performance of the rubber powder is optimal, and the prepared rubber asphalt has low viscosity and good stability.
Compared with the embodiment 3, the comparative example 4 directly adds titanium dioxide to replace the titanium dioxide modified expanded graphite in the scheme; the heat stability of the prepared rubber asphalt is greatly reduced, and the smoke release amount is greatly increased; therefore, the effect of catalytic oxidation by independently adding titanium dioxide is not ideal, the scheme improves the catalytic oxidation effect of titanium dioxide by using the expanded graphite to load titanium dioxide, and simultaneously, the expanded graphite is a hot high-temperature material and can improve the thermal stability of rubber asphalt.
Comparative examples 5-6 are prior art in which carbon nanotubes or graphene were directly blended with titanium dioxide to modify asphalt; as can be seen from the experimental data, both of these conventional protocols are weaker than example 3 in smoke delivery and thermal stability.
In conclusion, the technical scheme of the invention is the best technical scheme, and the prepared rubber asphalt has low viscosity, good thermal stability and low smell.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A low viscosity modified rubber asphalt is characterized in that; the low-viscosity modified rubber asphalt comprises, by weight, 78-85 parts of modified asphalt, 10-17 parts of activated rubber powder, 12-15 parts of styrene-butadiene-styrene block copolymer and 12-15 parts of softening oil.
2. A low viscosity modified rubber asphalt according to claim 1, wherein: the modified asphalt is prepared from base asphalt and a modifier.
3. A low viscosity modified rubber asphalt according to claim 1, wherein: the activated rubber powder is mainly prepared by reacting waste tire rubber powder, hydrogen peroxide, ferrous sulfate and polyvinylpyrrolidone.
4. A low viscosity modified rubber asphalt according to claim 2, wherein: the modifier is mainly prepared by reacting expanded graphite, tetrabutyl titanate, glacial acetic acid and silicone oil.
5. A low viscosity modified rubber asphalt according to claim 2, wherein: the mass ratio of the matrix asphalt to the modifier is 1: 0.008-0.03.
6. A low-viscosity modified rubber asphalt as claimed in claim 3, wherein: the particle size of the waste tire rubber powder is 40-80 meshes.
7. A low viscosity modified rubber asphalt according to claim 1, wherein: the softening oil is one or more of castor oil, aromatic oil, naphthenic oil, furfural oil and rubber filling oil.
8. A preparation method of low-viscosity modified rubber asphalt is characterized by comprising the following steps: comprises the following steps;
(1) preparing activated rubber powder:
(2) preparing modified asphalt:
(3) preparing a low-viscosity modified rubber asphalt finished product.
9. The process for producing a low-viscosity modified rubber asphalt as claimed in claim 8, wherein: comprises the following steps;
(1) taking waste tire rubber powder, and performing microwave irradiation; adding 30% hydrogen peroxide solution and ferrous sulfate, reacting, filtering, and drying; adding a polyvinylpyrrolidone solution, stirring, heating to 75-80 ℃, and reacting for 15-20 min; performing microwave irradiation to obtain activated rubber powder;
(2) mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed, and reacting; adding expanded graphite, heating to 50-55 ℃, and reacting; heating to 78-82 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier;
heating the matrix asphalt at 185-190 ℃, stirring, and adding a modifier; shearing at high speed to obtain modified asphalt;
(3) mixing the modified asphalt and the softening oil, stirring and developing; adding the activated rubber powder prepared in the step (1) and a styrene-butadiene-styrene block copolymer, and stirring; heating to 180-190 ℃; shearing at a high speed, heating to 205-225 ℃, stirring at a high speed, keeping constant temperature, and developing; obtaining the finished product of the low-viscosity modified rubber asphalt.
10. The method for producing a low-viscosity modified rubber asphalt according to any one of claims 8 to 9, wherein: comprises the following steps;
(1) taking waste tire rubber powder, and performing microwave irradiation for 60-100 s; adding 30% of hydrogen peroxide solution and ferrous sulfate, wherein the mass ratio of the hydrogen peroxide solution to the waste tire rubber powder is 3: 1; reacting for 2-3 h, filtering and drying; adding a polyvinylpyrrolidone solution, stirring, heating to 75-80 ℃, and reacting for 15-20 min; performing microwave irradiation for 25-30 s; obtaining activated rubber powder;
(2) mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, stirring, slowly adding concentrated sulfuric acid, stirring at a high speed of 1500r/min at the stirring speed of 1000-; adding expanded graphite, heating to 50-55 deg.C, and reacting for 30-40 min; heating to 78-82 ℃, removing absolute ethyl alcohol, drying, adding silicone oil, and stirring to obtain a modifier;
heating the matrix asphalt at 185-190 ℃, stirring, and adding a modifier; shearing at a high speed, wherein the shearing speed is 3000-4000 r/min, and the shearing time is 40-60 min; preparing modified asphalt;
(3) mixing the modified asphalt and the softening oil, stirring, and developing for 30-40 min; adding the activated rubber powder prepared in the step (1) and a styrene-butadiene-styrene block copolymer, and stirring; heating to 180-190 ℃; shearing at a high speed of 3500-5000 r/min for 20-40 min; heating to 205-225 ℃, stirring at high speed for 40-50 min; keeping the temperature constant, and developing for 10-20 min; the low-viscosity modified rubber asphalt is prepared.
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| CN112876870A (en) * | 2021-01-22 | 2021-06-01 | 熊彪 | Rubber asphalt and preparation method thereof |
| CN113174801A (en) * | 2021-04-30 | 2021-07-27 | 上海交通大学 | Durable silent downward-penetrating type pavement structure and construction method thereof |
| CN113232212A (en) * | 2021-05-08 | 2021-08-10 | 益路恒丰衡水沥青科技有限公司 | Rubber asphalt production equipment based on microwave heating |
| CN113277776A (en) * | 2021-06-07 | 2021-08-20 | 昆明理工大学 | Microwave vulcanization thermosetting natural rubber asphalt mixture and preparation method thereof |
| CN113372730A (en) * | 2021-05-17 | 2021-09-10 | 山东大学 | Self-healing asphalt material and preparation method and application thereof |
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| CN115322545A (en) * | 2022-08-26 | 2022-11-11 | 中国矿业大学 | Uncrosslinked waste latex reinforced and toughened polylactic acid composite material and preparation method thereof |
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| CN113174801A (en) * | 2021-04-30 | 2021-07-27 | 上海交通大学 | Durable silent downward-penetrating type pavement structure and construction method thereof |
| CN113174801B (en) * | 2021-04-30 | 2023-12-15 | 上海交通大学 | Durable mute downward-penetrating type pavement structure and construction method thereof |
| CN113232212A (en) * | 2021-05-08 | 2021-08-10 | 益路恒丰衡水沥青科技有限公司 | Rubber asphalt production equipment based on microwave heating |
| CN113232212B (en) * | 2021-05-08 | 2022-03-15 | 益路恒丰衡水沥青科技有限公司 | Rubber asphalt production equipment based on microwave heating |
| CN113372730A (en) * | 2021-05-17 | 2021-09-10 | 山东大学 | Self-healing asphalt material and preparation method and application thereof |
| CN113277776B (en) * | 2021-06-07 | 2023-06-16 | 昆明理工大学 | Microwave vulcanized thermosetting natural rubber asphalt mixture and preparation method thereof |
| CN113277776A (en) * | 2021-06-07 | 2021-08-20 | 昆明理工大学 | Microwave vulcanization thermosetting natural rubber asphalt mixture and preparation method thereof |
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