CN115058124A - Bio-based normal-temperature asphalt modifier and preparation method thereof - Google Patents
Bio-based normal-temperature asphalt modifier and preparation method thereof Download PDFInfo
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Classifications
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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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The invention discloses a bio-based normal temperature asphalt modifier and a preparation method thereof; the bio-based normal-temperature asphalt modifier comprises the following preparation raw materials in parts by mass: 40-70 parts of plant asphalt, 10-20 parts of unsaturated fatty acid, 10-20 parts of extract oil, 15-25 parts of tackifying resin, 5-10 parts of SBS rubber modifier, 0-10 parts of liquid rubber, 5-10 parts of slaked lime and 1-3 parts of surfactant; wherein the plant asphalt is a composition of residues of castor beans after refining plant oil and residues of corn straws after refining plant oil. The bio-based normal-temperature asphalt modifier can improve the high-low temperature stability and the bonding strength of the petroleum asphalt, can realize the normal-temperature liquefaction of the petroleum asphalt, can be mixed with the mixture without heating, and can reduce the environmental pollution and the energy consumption generated in the production and construction process of the hot-mix asphalt mixture; the acid-base reaction of the unsaturated fatty acid and the slaked lime can improve the solidification speed of the petroleum asphalt and is beneficial to the rapid pavement forming.
Description
Technical Field
The application belongs to the technical field of road engineering materials, and particularly relates to a bio-based normal-temperature asphalt modifier and a preparation method thereof.
Background
Highway construction and maintenance requires a large amount of petroleum asphalt. As the reserves of the petroleum asphalt are continuously reduced and the consumption of the petroleum asphalt is continuously increased as a non-renewable resource, the price of the petroleum asphalt is continuously increased in the foreseeable future, and the international asphalt price is influenced by external unstable factors such as international war disorder, geopolitics, natural disasters and the like.
Meanwhile, China is in a high-speed development period, although science and technology development is rapid and people living conditions are improved, environmental pollution is increased, and the carbon emission in 2019 China reaches 100 hundred million tons and is the top of the world. The hot asphalt construction is a main method for paving the asphalt pavement in China, and is a process material for heating, paving and rolling asphalt and aggregate under the condition of high temperature. Although excellent in workability and workability, it generates a large amount of CO during construction due to the need for high-temperature heating 2 、NO、SO 2 And toxic smoke such as asphalt smoke and the like not only directly threatens the physical health of operators, but also causes serious environmental pollution. The heating needs to consume a large amount of stone resources such as gasoline, diesel oil, natural gas and the like, the cost is increased, the greenhouse gas emission is increased,this is not in accordance with the environmental protection concept of 'carbon peak reaching and carbon neutralization' advocated by China in the modern times.
In order to avoid the petroleum asphalt becoming a key factor restricting the development of road construction in China and solve the problem of environmental pollution caused by the road construction and maintenance process in China, a new material which is environment-friendly, renewable, low in price, sufficient in yield and high in performance is urgently needed to replace the petroleum asphalt so as to relieve the contradiction between the large demand and the insufficient yield of the current petroleum asphalt and the construction development and the environmental pollution.
Disclosure of Invention
In view of this, some embodiments disclose a bio-based normal temperature asphalt modifier, which comprises the following raw materials in parts by mass:
the plant asphalt is a composition of residues obtained after vegetable oil is extracted from castor beans and residues obtained after vegetable oil is extracted from corn straws, and the mass ratio of the plant asphalt to the corn straws is 1-3: 1.
Some examples disclose the bio-based normal temperature asphalt modifier, and the unsaturated fatty acid is castor oil.
In some examples, the extract oil is furfural extract oil.
In some embodiments, the bio-based normal temperature asphalt modifier is prepared by mixing a tackifying resin with one or more of a liquid coumarone resin, a liquid terpene resin and a liquid rosin resin.
In some embodiments, the bio-based normal temperature asphalt modifier is a composition of a liquid coumarone resin and a liquid rosin resin in a mass ratio of 2: 1.
In some embodiments, the bio-based normal temperature asphalt modifier is a composition of a liquid coumarone resin and a liquid terpene resin in a mass ratio of 3: 1.
In some embodiments, the liquid rubber is a composition of liquid polyurethane rubber and liquid polybutadiene rubber.
Some embodiments disclose the bio-based normal temperature asphalt modifier, wherein the surfactant is a composition of hydroxyl-terminated polysiloxane, thin-layer graphene dispersion liquid and silane coupling agent.
In some embodiments of the bio-based normal-temperature asphalt modifier disclosed in the examples, in the surfactant, the mass ratio of the hydroxyl-terminated polysiloxane, the thin-layer graphene dispersion liquid and the silane coupling agent is 1-3: 1: 1.
Some embodiments disclose a preparation method of a bio-based normal temperature asphalt modifier, comprising the following steps:
(1) weighing 40-70 parts of plant asphalt according to the quality of a formula, putting the plant asphalt into a reaction kettle, and heating the reaction kettle to 100-150 ℃;
(2) adding 10-20 parts of extract oil into a reaction kettle, and reacting for 1 hour in a heat preservation manner;
(3) after the reaction in the reaction kettle in the step (2) is finished, adding 5-10 parts of SBS rubber modifier into the reaction kettle, heating the reaction kettle to 150-170 ℃, and carrying out heat preservation reaction for 2-4 hours;
(4) after the reaction in the reaction kettle in the step (3) is finished, reducing the temperature of the reaction kettle to 80 +/-5 ℃, adding 10-20 parts of unsaturated fatty acid and 15-25 parts of tackifying resin into the reaction kettle, and carrying out heat preservation reaction for 1-1.5 h;
(5) after the reaction in the reaction kettle in the step (4) is finished, reducing the temperature of the reaction kettle to 40 +/-5 ℃, adding 0-10 parts of liquid rubber, 5-10 parts of slaked lime and 1-3 parts of surfactant into the reaction kettle, and stirring for 0.5 h;
(6) when the temperature of the reaction kettle is reduced to normal temperature, obtaining the bio-based normal-temperature asphalt modifier; wherein the content of each component is calculated by mass portion.
According to the bio-based normal temperature asphalt modifier and the preparation method disclosed by the embodiment of the application, plant asphalt, unsaturated fatty acid and the like which have good compatibility with petroleum asphalt are taken as raw materials, and extract oil, tackifying resin, SBS rubber modifier, liquid rubber, surfactant and slaked lime are taken as auxiliary materials, so that the prepared bio-based normal temperature asphalt modifier can improve the high-low temperature stability and the bonding strength of the petroleum asphalt, reduce the volatile pollution and is beneficial to environmental protection. The embodiment of the application can realize normal-temperature liquefaction of the petroleum asphalt, can be mixed with the mixture without heating, and can be used for construction, so that the environmental pollution and energy consumption generated in the production and construction process of the hot-mixed asphalt mixture are reduced; the acid-base reaction of the unsaturated fatty acid and the slaked lime can improve the solidification speed of the petroleum asphalt and is beneficial to the rapid pavement forming.
Detailed Description
The word "embodiment" as used herein, is not necessarily to be construed as preferred or advantageous over other embodiments, including any embodiment illustrated as "exemplary". Performance index tests in the examples of this application, unless otherwise indicated, were performed using routine experimentation in the art. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; other test methods and techniques not specifically mentioned in the present application are those commonly employed by those of ordinary skill in the art. Other raw materials, reagents, test methods and technical means not specifically mentioned as the present invention refer to those generally used by those skilled in the art, and those generally used. The raw materials adopted in the embodiment of the application are all industrial grade.
The terms "substantially" and "about" are used herein to describe small fluctuations. For example, they may mean less than or equal to ± 5%, such as less than or equal to ± 2%, such as less than or equal to ± 1%, such as less than or equal to ± 0.5%, such as less than or equal to ± 0.2%, such as less than or equal to ± 0.1%, such as less than or equal to ± 0.05%. Numerical data represented or presented herein in a range format is used merely for convenience and brevity and thus should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of "1 to 5%" should be interpreted to include not only the explicitly recited values of 1% to 5%, but also include individual values and sub-ranges within the indicated range. Thus, included in this numerical range are individual values, such as 2%, 3.5%, and 4%, and sub-ranges, such as 1% to 3%, 2% to 4%, and 3% to 5%, etc. This principle applies equally to ranges reciting only one numerical value. Moreover, such an interpretation applies regardless of the breadth of the range or the characteristics being described. The amounts of the components mentioned herein are usually expressed in parts by mass unless other units of measure are explicitly indicated.
In this document, including the claims, conjunctions such as "comprising," including, "" carrying, "" having, "" containing, "" involving, "" containing, "and the like are understood to be open-ended, i.e., to mean" including but not limited to. Only the conjunctions "consisting of … …" and "consisting of … …" are closed conjunctions.
In the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In the examples, some methods, means, instruments, apparatuses, etc. known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.
On the premise of no conflict, the technical features disclosed in the embodiments of the present application may be combined arbitrarily, and the obtained technical solution belongs to the content disclosed in the embodiments of the present application.
The biomass renewable energy sources such as the vegetable oil processing waste, the crop straw or the primary processing waste, the livestock excrement and the like are widely distributed, the materials are convenient to obtain, the reserves are huge, the cyclic utilization is realized, the green environmental protection is realized, the price is low, and the biomass renewable energy sources are widely concerned and researched by relevant experts at home and abroad. The current biomass fast cracking technology realizes the large-scale production of factories, and the products mainly comprise heavy bio-oil and light bio-oil. The heavy bio-oil is usually called biological heavy oil for short, the main chemical composition of the heavy bio-oil is very similar to the composition elements of the petroleum asphalt, the performance characteristics are also very similar, and the heavy bio-oil can be prepared with the petroleum asphalt to produce the bio-asphalt so as to improve the defects and shortcomings of the petroleum asphalt. The price of biological heavy oil in the market is about 2000 yuan per ton, while the price of domestic matrix asphalt is about more than 4000 yuan per ton, if the plant asphalt replaces petroleum asphalt or the biological heavy oil is mixed into the petroleum asphalt to form the biological asphalt, the use amount of the petroleum asphalt is reduced, the material cost can be greatly saved, and meanwhile, even if the petrochemical asphalt is exhausted in the future, the biological asphalt can still be continuously produced by using a plant refining technology, so that good ecological benefits are generated.
However, the research on the biological asphalt is started later, and the biological asphalt only stays in a laboratory stage no matter from the breadth and the depth, so that the practical engineering application is less. Moreover, the existing biological asphalt and mixture are basically applied to hot-mix asphalt mixture and have the problems of poor performance and the like. Therefore, the embodiment of the invention provides a bio-based normal temperature asphalt modifier and a preparation method thereof, which aim to solve the problems in the prior art.
In some embodiments, the bio-based normal temperature asphalt modifier is prepared from the following raw materials in parts by mass: 40-70 parts of plant asphalt, 10-20 parts of unsaturated fatty acid, 10-20 parts of extract oil, 15-25 parts of tackifying resin, 5-10 parts of SBS rubber modifier, 0-10 parts of liquid rubber, 5-10 parts of slaked lime and 1-3 parts of surfactant; the plant asphalt is a composition of residues obtained after vegetable oil is extracted from castor beans and residues obtained after vegetable oil is extracted from corn straws, and the mass ratio of the plant asphalt to the corn straws is 1-3: 1.
The plant asphalt does not belong to a multi-aromatic-ring complex compound, has the advantages of low carbon, environmental protection and reproducibility, has good fluidity at normal temperature, plays a thickening role after being uniformly mixed with the petroleum asphalt, can increase the adhesiveness and affinity of the petroleum asphalt and calcium carbonate or stone materials, and is not easy to generate sedimentation and delamination.
Generally, the residues of castor beans after vegetable oil extraction or corn straws after vegetable oil extraction mainly comprise 60-80% of fatty acid and vegetable alcohol, and the oil solubility of the residues is similar to that of petroleum asphalt.
As an alternative embodiment, the plant asphalt is a composition of a residue obtained by refining plant oil from castor beans and a residue obtained by refining plant oil from corn stalks, and the mass ratio of the residue to the residue is 3: 1.
As an alternative embodiment, the plant pitch is a composition of a residue obtained by extracting the plant oil from castor beans and a residue obtained by extracting the plant oil from corn stalks, and the mass ratio of the plant pitch to the corn stalks is 2: 1.
As an alternative embodiment, the plant pitch is a composition of a residue obtained by extracting plant oil from castor beans and a residue obtained by extracting plant oil from corn stalks, and the mass ratio of the plant pitch to the residue is 1: 1.
As an alternative embodiment, the unsaturated fatty acid is castor oil. The unsaturated fatty acid in the castor oil is used as a light component to reduce the solubility parameter between the asphaltene and the light component in the petroleum asphalt, the castor oil is gradually decomposed into unsaturated acid containing three conjugated double bonds with high reaction activity through low-speed shearing, the intermiscibility between the petroleum asphalt components is enhanced, and the aim of regenerating aged petroleum asphalt can be achieved.
As an alternative embodiment, the extract oil is furfural extract oil. The furfural extract oil is used as a component of the asphalt modifier, which is beneficial to improving the compatibility of the SBS rubber modifier and the petroleum asphalt, improving the ductility, penetration and segregation stability of the petroleum asphalt before and after aging, and reducing the rotational viscosity and rutting factors of the petroleum asphalt before and after aging; the blending amount of the furfural extract oil is increased, and the softening point is increased and then reduced.
Generally, furfural extract oil has a certain adverse effect on the high-temperature performance of petroleum asphalt, the higher the blending ratio is, the more obvious the adverse effect on the high-temperature performance is, and in order to ensure that the high-temperature performance of the petroleum asphalt is not reduced, the blending ratio of the furfural extract oil is controlled when blending the petroleum asphalt; the furfural extract oil has a certain effect of improving the low-temperature performance of the petroleum asphalt, and the higher the blending ratio is, the more obvious the corresponding low-temperature performance is improved. And correspondingly adjusting the blending proportion of the furfural extract oil by combining the high-temperature performance and the low-temperature performance of the petroleum asphalt.
In some embodiments, the tackifying resin is one or a combination of more than one of a liquid coumarone resin, a liquid terpene resin, a liquid rosin resin. The tackifying resin has good polymer compatibility, and is used as a component in the asphalt modifier to wet the bonding surface through surface diffusion or internal diffusion, so that the bonding strength between the modifier and an adherend is improved. The tackifying resin can reduce the elastic modulus and cohesive strength of the petroleum asphalt and endow the petroleum asphalt with initial adhesion and peel strength.
In an alternative embodiment, the tackifying resin is a liquid coumarone resin. The liquid coumarone resin has good tackifying performance, and after being compounded, the rubber has good cohesiveness.
In an alternative embodiment, the tackifying resin is a composition of liquid coumarone resin and liquid rosin resin in a mass ratio of 2: 1. The liquid rosin resin is used as a tackifying resin, and can improve toughness, bonding strength and low-temperature resistance.
As an alternative embodiment, the tackifying resin is a composition of liquid coumarone resin and liquid terpene resin in a mass ratio of 3: 1. The liquid terpene resin has excellent compatibility, weather resistance and tackifying effect in SBS rubber modifier.
In some embodiments, the liquid rubber is a combination of liquid urethane rubber and liquid polybutadiene rubber. The liquid rubber is used as a component in the asphalt modifier, so that the construction temperature can be reduced, and the high-temperature anti-rutting performance and the low-temperature anti-cracking performance can be improved.
In some embodiments, the surfactant is a composition of hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion, and a silane coupling agent.
In some embodiments, the surfactant comprises a hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent in a mass ratio of 1-3: 1: 1.
According to an optional embodiment, the surfactant is a composition consisting of hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent, and the mass ratio of the hydroxyl-terminated polysiloxane, the thin-layer graphene dispersion liquid and the silane coupling agent is 1:1: 1.
In an alternative embodiment, the surfactant is a composition of hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent, and the mass ratio of the hydroxyl-terminated polysiloxane, the thin-layer graphene dispersion liquid and the silane coupling agent is 2:1: 1.
According to an optional embodiment, the surfactant is a composition consisting of hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent, and the mass ratio of the hydroxyl-terminated polysiloxane, the thin-layer graphene dispersion liquid and the silane coupling agent is 3:1: 1.
The graphene has affinity to petroleum asphalt and can be intercalated or peeled by hot petroleum asphalt to form a supermolecular structure taking the graphene sheet as a base surface; the graphene is doped, so that the behavior characteristics, especially low-temperature performance, of the petroleum asphalt are remarkably improved. The graphene can reduce the energy between interfaces, and the graphene is compounded with the hydroxyl polysiloxane and the silane coupling agent, so that the interface between the petroleum asphalt and the mineral aggregate can be reduced, the compaction of the pavement is facilitated, and the pushing, cracking and the like in the pavement paving and rolling process are reduced.
The silane coupling agent is used for improving the interface action between inorganic matters and organic matters in the components, can improve the performance of the asphalt modifier, and is used for the cross-linking reaction among molecules.
The SBS rubber modifier has the characteristics of both plastics and rubber, and can improve the high-temperature and low-temperature performance of the petroleum asphalt.
The slaked lime can improve the viscosity of the petroleum asphalt and simultaneously improve the surface property of stone materials; the slaked lime can reduce the charge on the surface of stone and reduce the surface energy, the stone with small surface energy is not combined with a hydrogen bond, and the water stability is good; the acid-base reaction of unsaturated fatty acid and slaked lime raises the solidification speed of petroleum asphalt and is favorable to fast road surface formation.
In some embodiments, the preparation method of the bio-based normal temperature asphalt modifier comprises the following steps:
(1) weighing 40-70 parts of plant asphalt according to the quality of a formula, putting the plant asphalt into a reaction kettle, and heating the reaction kettle to 100-150 ℃; the plant pitch is heated to a fluid state and then mixed with the other components. This can improve the compatibility of the plant pitch with other components.
(2) Adding 10-20 parts of extract oil into a reaction kettle, carrying out heat preservation reaction for 1 hour to remove water in the material, fully contacting the plant asphalt with the extract oil, and carrying out crosslinking reaction of unsaturated bonds to obtain an active blend;
(3) after the reaction in the reaction kettle in the step (2) is finished, adding 5-10 parts of SBS rubber modifier into the reaction kettle, heating the reaction kettle to 150-170 ℃, and carrying out heat preservation reaction for 2-4 hours to promote the SBS rubber modifier to be further compatible and crosslinked with the active mixture in the step (2) to form uniform liquid;
(4) after the reaction in the reaction kettle in the step (3) is finished, reducing the temperature of the reaction kettle to 80 +/-5 ℃, sequentially adding 10-20 parts of unsaturated fatty acid and 15-25 parts of tackifying resin into the reaction kettle, carrying out heat preservation reaction for 1-1.5 h, further removing water in the material, further enabling the blend to be compatible and crosslinked, and forming a viscous uniform mixture;
(5) after the reaction in the reaction kettle in the step (4) is finished, reducing the temperature of the reaction kettle to 40 +/-5 ℃, adding 0-10 parts of liquid rubber into the reaction kettle, carrying out physical modification on the viscous uniform mixture in the step (4) by 5-10 parts of slaked lime, adding 1-3 parts of surfactant to improve the adhesiveness, the water stripping resistance and the comprehensive mechanical property of the viscous uniform mixture, and stirring for 0.5 h;
(6) and when the temperature of the reaction kettle is reduced to normal temperature, obtaining uniform viscous liquid, namely the bio-based normal-temperature asphalt modifier.
The technical details are further illustrated in the following examples.
Example 1
The bio-based normal temperature asphalt modifier disclosed in example 1 comprises the following preparation raw materials in parts by mass:
40 parts of plant asphalt, wherein the plant asphalt is a composition of residues obtained by extracting plant oil from castor beans and residues obtained by extracting the plant oil from corn straws in a mass ratio of 3: 1; 20 parts of castor oil; 20 parts of furfural extract oil; 15 parts of liquid coumarone resin; 10 parts of SBS rubber modifier; 0 part of liquid rubber; 10 parts of slaked lime; 1 part of surfactant, wherein the surfactant is a composition consisting of hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent, and the mass ratio of the hydroxyl-terminated polysiloxane to the thin-layer graphene dispersion liquid to the silane coupling agent is 1:1: 1.
The preparation method of the bio-based normal temperature asphalt modifier disclosed in the embodiment 1 comprises the following steps:
(1) weighing 40 parts of plant asphalt according to the formula quality, putting the plant asphalt into a reaction kettle, and heating the reaction kettle to 100 ℃;
(2) adding 20 parts of furfural extract oil into the reaction kettle, and carrying out heat preservation reaction for 1 hour;
(3) after the reaction in the reaction kettle in the step (2) is finished, adding 10 parts of SBS rubber modifier into the reaction kettle, heating the reaction kettle to 150 ℃, and carrying out heat preservation reaction for 2 hours;
(4) after the reaction in the reaction kettle in the step (3) is finished, reducing the temperature of the reaction kettle to 80 +/-5 ℃, adding 20 parts of castor oil and 15 parts of liquid coumarone resin into the reaction kettle, and carrying out heat preservation reaction for 1 hour;
(5) after the reaction in the reaction kettle in the step (4) is finished, reducing the temperature of the reaction kettle to 40 +/-5 ℃, adding 0 part of liquid rubber, 10 parts of slaked lime and 1 part of surfactant into the reaction kettle, and stirring for 0.5 h;
(6) and when the temperature of the reaction kettle is reduced to normal temperature, obtaining the bio-based normal temperature asphalt modifier.
Heating 60 parts of petroleum asphalt SK70 to 100 ℃, adding 40 parts of prepared bio-based normal temperature asphalt modifier, and reacting for 1 hour under heat preservation to obtain normal temperature modified asphalt;
and forcibly stirring the prepared normal-temperature modified asphalt and AC-10 or SMA-10 grade ingredients described in the industrial standard JTG F40-2004 at the mass ratio of 5:100 at 25 ℃ for 45s to obtain a normal-temperature modified asphalt mixture.
Example 2
The bio-based normal temperature asphalt modifier disclosed in embodiment 2 comprises the following preparation raw materials in parts by mass:
50 parts of plant asphalt, wherein the plant asphalt is a composition of residues obtained by refining plant oil from castor beans and residues obtained by refining the plant oil from corn straws in a mass ratio of 2: 1; 15 parts of castor oil; 15 parts of furfural extract oil; 20 parts of tackifying resin, wherein the tackifying resin is a composition consisting of liquid coumarone resin and liquid rosin resin according to a mass ratio of 2: 1; 8 parts of SBS rubber modifier; 5 parts of liquid rubber, wherein the liquid rubber is a composition consisting of liquid polyurethane rubber and liquid polybutadiene rubber; 7 parts of slaked lime; and 2 parts of a surfactant, wherein the surfactant is a composition consisting of hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent, and the mass ratio of the hydroxyl-terminated polysiloxane to the thin-layer graphene dispersion liquid to the silane coupling agent is 2:1: 1.
The preparation method of the bio-based normal temperature asphalt modifier disclosed in the embodiment 2 comprises the following steps:
(1) weighing 50 parts of plant asphalt according to the formula quality, putting the plant asphalt into a reaction kettle, and heating the reaction kettle to 120 ℃;
(2) adding 15 parts of furfural extract oil into a reaction kettle, and carrying out heat preservation reaction for 1 hour;
(3) after the reaction in the reaction kettle in the step (2) is finished, adding 8 parts of SBS rubber modifier into the reaction kettle, heating the reaction kettle to 160 ℃, and carrying out heat preservation reaction for 3 hours;
(4) after the reaction in the reaction kettle in the step (3) is finished, reducing the temperature of the reaction kettle to 80 +/-5 ℃, adding 15 parts of castor oil and 20 parts of tackifying resin into the reaction kettle, and carrying out heat preservation reaction for 1 hour;
(5) after the reaction in the reaction kettle in the step (4) is finished, reducing the temperature of the reaction kettle to 40 +/-5 ℃, adding 5 parts of liquid rubber, 7 parts of slaked lime and 2 parts of surfactant into the reaction kettle, and stirring for 0.5 h;
(6) and when the temperature of the reaction kettle is reduced to normal temperature, obtaining the bio-based normal-temperature asphalt modifier.
Heating 70 parts of petroleum asphalt SK70 to 110 ℃, adding 30 parts of prepared bio-based normal temperature asphalt modifier, and reacting for 1.5 hours under heat preservation to obtain normal temperature modified asphalt;
and forcibly stirring the prepared normal-temperature modified asphalt and AC-10 or SMA-10 grade ingredients described in the technical Specification for road asphalt pavement construction (JTG F40-2004) of the industry standard for 50s at a mass ratio of 5.5:100 at 25 ℃ to obtain a normal-temperature modified asphalt mixture.
Example 3
The bio-based normal temperature asphalt modifier disclosed in example 3 comprises the following preparation raw materials in parts by mass:
70 parts of plant asphalt, wherein the plant asphalt is a composition of residues obtained by extracting plant oil from castor beans and residues obtained by extracting the plant oil from corn straws in a mass ratio of 1: 1; 10 parts of castor oil; 10 parts of furfural extract oil; 25 parts of tackifying resin, wherein the tackifying resin is a composition consisting of liquid coumarone resin and liquid terpene resin in a mass ratio of 3: 1; 5 parts of SBS rubber modifier; 10 parts of liquid rubber, wherein the liquid rubber is a composition consisting of liquid polyurethane rubber and liquid polybutadiene rubber; 5 parts of slaked lime; and 3 parts of a surfactant, wherein the surfactant is a composition consisting of hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent, and the mass ratio of the hydroxyl-terminated polysiloxane to the thin-layer graphene dispersion liquid to the silane coupling agent is 3:1: 1.
The preparation method of the bio-based normal temperature asphalt modifier disclosed in the embodiment 3 comprises the following steps:
(1) weighing 70 parts of plant asphalt according to the formula quality, putting the plant asphalt into a reaction kettle, and heating the reaction kettle to 150 ℃;
(2) adding 10 parts of furfural extract oil into a reaction kettle, and carrying out heat preservation reaction for 1 hour;
(3) after the reaction in the reaction kettle in the step (2) is finished, adding 5 parts of SBS rubber modifier into the reaction kettle, heating the reaction kettle to 170 ℃, and carrying out heat preservation reaction for 4 hours;
(4) after the reaction in the reaction kettle in the step (3) is finished, reducing the temperature of the reaction kettle to 80 +/-5 ℃, adding 10 parts of castor oil and 25 parts of tackifying resin into the reaction kettle, and carrying out heat preservation reaction for 1.5 hours;
(5) after the reaction in the reaction kettle in the step (4) is finished, reducing the temperature of the reaction kettle to 40 +/-5 ℃, adding 10 parts of liquid rubber, 5 parts of slaked lime and 3 parts of surfactant into the reaction kettle, and stirring for 0.5 h;
(6) and when the temperature of the reaction kettle is reduced to normal temperature, obtaining the bio-based normal-temperature asphalt modifier.
Heating 70 parts of petroleum asphalt SK70 to 120 ℃, adding 30 parts of prepared bio-based normal temperature asphalt modifier, and reacting for 2 hours under heat preservation to obtain normal temperature modified asphalt;
the prepared normal-temperature modified asphalt and AC-10 or SMA-10 grade ingredients described in the industry standard JTG F40-2004 of Highway asphalt pavement construction technical Specification are forcibly stirred for 60s at 25 ℃ according to the mass ratio of 6:100 to obtain a normal-temperature modified asphalt mixture.
The room temperature modified asphalt mixtures of examples 1 to 3 were tested according to the industrial standards JTG F40-2004 and JTG E20-2011, which are road asphalt pavement construction specifications and road engineering asphalt and asphalt mixture test procedures, and the results are shown in table 1.
Table 1 examples 1-3 test results of properties of room temperature modified asphalt mixtures
| Performance of | Example 1 | Example 2 | Example 3 | Standard requirements |
| Grade of adhesion | Greater than 5 grade | Greater than 5 grade | Greater than 5 grade | Grade not less than 3 |
| Marshall stability (kN) | 12 | 15 | 17 | ≥8 |
| Residual stability (%) | ＞85 | ＞85 | ＞90 | ≥80 |
| Degree of dynamic stability (times/mm) | ＞3000 | ＞3000 | ＞3000 | ≥2500 |
As can be seen from the comparison of the test results of examples 1-3 with the standard requirements, the Marshall stability and the residual stability of the asphalt mixture are influenced by the mixing amount of the plant asphalt, the mixing ratio of the plant asphalt with the petroleum asphalt and the mixing ratio of the asphalt mixture. Meanwhile, under the condition that the preparation conditions are basically unchanged, the bio-based normal temperature asphalt modifier provided by the embodiment of the invention is mixed with petroleum asphalt and a grade ingredient in different proportions, so that the high temperature, the low temperature, the water stability and the mechanical property of the finally obtained asphalt mixture are greatly improved, and the Marshall stability, the residual stability and the dynamic stability are all superior to the standard requirements.
According to the bio-based normal temperature asphalt modifier and the preparation method disclosed by the embodiment of the application, plant asphalt and unsaturated fatty acid which have good compatibility with petroleum asphalt are used as raw materials, extract oil, tackifying resin, SBS rubber modifier, liquid rubber, surfactant and slaked lime are used as auxiliary materials, and the prepared bio-based normal temperature asphalt modifier can improve the high and low temperature stability and bonding strength of asphalt, reduce volatilization pollution and is beneficial to environmental protection. The embodiment of the application can realize normal-temperature liquefaction of the asphalt, can be mixed with the mixture without heating, and can be used for construction, so that the environmental pollution and energy consumption generated in the production construction process of the hot-mixed asphalt mixture are reduced; the acid-base reaction of unsaturated fatty acid and slaked lime can raise the solidification speed of asphalt and is favorable to fast road surface formation.
The technical solutions and the technical details disclosed in the embodiments of the present application are only examples to illustrate the inventive concept of the present application, and do not constitute a limitation on the technical solutions of the present application, and all the conventional changes, substitutions or combinations made on the technical details disclosed in the present application have the same inventive concept as the present application and are within the protection scope of the claims of the present application.
Claims (10)
1. The bio-based normal temperature asphalt modifier is characterized by comprising the following raw materials in parts by mass:
the plant asphalt is a composition of a residue obtained after vegetable oil is extracted from castor beans and a residue obtained after vegetable oil is extracted from corn straws, and the mass ratio of the plant asphalt to the residue is 1-3: 1.
2. The bio-based normal temperature asphalt modifier as claimed in claim 1, wherein the unsaturated fatty acid is castor oil.
3. The bio-based normal temperature asphalt modifier according to claim 1, wherein the extract oil is furfural extract oil.
4. The bio-based normal temperature asphalt modifier as claimed in claim 1, wherein the tackifying resin is one or a combination of more than one of liquid coumarone resin, liquid terpene resin and liquid rosin resin.
5. The bio-based normal temperature asphalt modifier as claimed in claim 4, wherein the tackifying resin is a composition of liquid coumarone resin and liquid rosin resin in a mass ratio of 2: 1.
6. The bio-based normal-temperature asphalt modifier as claimed in claim 4, wherein the tackifying resin is a composition of liquid coumarone resin and liquid terpene resin in a mass ratio of 3: 1.
7. The bio-based normal temperature asphalt modifier as claimed in claim 1, wherein the liquid rubber is a composition of liquid urethane rubber and liquid polybutadiene rubber.
8. The bio-based normal-temperature asphalt modifier as claimed in claim 1, wherein the surfactant is a composition of hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent.
9. The bio-based normal-temperature asphalt modifier as claimed in claim 8, wherein the surfactant comprises hydroxyl-terminated polysiloxane, a thin-layer graphene dispersion liquid and a silane coupling agent in a mass ratio of 1-3: 1: 1.
10. The preparation method of the bio-based normal temperature asphalt modifier according to claim 1, characterized by comprising the following steps:
(1) weighing 40-70 parts of plant asphalt according to the quality of a formula, putting the plant asphalt into a reaction kettle, and heating the reaction kettle to 100-150 ℃;
(2) adding 10-20 parts of extract oil into the reaction kettle, and reacting for 1 hour in a heat preservation manner;
(3) after the reaction in the reaction kettle in the step (2) is finished, adding 5-10 parts of SBS rubber modifier into the reaction kettle, heating the reaction kettle to 150-170 ℃, and carrying out heat preservation reaction for 2-4 hours;
(4) after the reaction in the reaction kettle in the step (3) is finished, reducing the temperature of the reaction kettle to 80 +/-5 ℃, adding 10-20 parts of unsaturated fatty acid and 15-25 parts of tackifying resin into the reaction kettle, and carrying out heat preservation reaction for 1-1.5 hours;
(5) after the reaction in the reaction kettle in the step (4) is finished, reducing the temperature of the reaction kettle to 40 +/-5 ℃, adding 0-10 parts of liquid rubber, 5-10 parts of slaked lime and 1-3 parts of surfactant into the reaction kettle, and stirring for 0.5 h;
(6) when the temperature of the reaction kettle is reduced to normal temperature, obtaining the bio-based normal-temperature asphalt modifier;
wherein the content of each component is calculated by mass portion.
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| CN116354725A (en) * | 2023-04-20 | 2023-06-30 | 鹰纳绿炭(上海)科技有限公司 | Graphite electrode binder and preparation method thereof, and graphite electrode and preparation method thereof |
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| CN102911507A (en) * | 2012-11-12 | 2013-02-06 | 江柳 | Composite asphalt modifier as well as preparation method and application method of composite asphalt modifier |
| CN110903662A (en) * | 2019-11-26 | 2020-03-24 | 湖南鑫长胜材料科技有限公司 | Regenerated asphalt and preparation method thereof |
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| CN102911507A (en) * | 2012-11-12 | 2013-02-06 | 江柳 | Composite asphalt modifier as well as preparation method and application method of composite asphalt modifier |
| CN110903662A (en) * | 2019-11-26 | 2020-03-24 | 湖南鑫长胜材料科技有限公司 | Regenerated asphalt and preparation method thereof |
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| CN116354725A (en) * | 2023-04-20 | 2023-06-30 | 鹰纳绿炭(上海)科技有限公司 | Graphite electrode binder and preparation method thereof, and graphite electrode and preparation method thereof |
| CN116354725B (en) * | 2023-04-20 | 2024-05-28 | 鹰纳绿炭(上海)科技有限公司 | Graphite electrode binder and preparation method thereof, and graphite electrode and preparation method thereof |
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Application publication date: 20220916 |