CN115353746B - Ion exchange resin modified emulsified asphalt and preparation method thereof - Google Patents
Ion exchange resin modified emulsified asphalt and preparation method thereof Download PDFInfo
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- CN115353746B CN115353746B CN202210855007.6A CN202210855007A CN115353746B CN 115353746 B CN115353746 B CN 115353746B CN 202210855007 A CN202210855007 A CN 202210855007A CN 115353746 B CN115353746 B CN 115353746B
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- 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
- C08L95/005—Aqueous compositions, e.g. emulsions
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Abstract
The invention aims to provide ion exchange resin modified emulsified asphalt and a preparation method thereof, which belong to the technical field of road paving materials and are prepared from ion exchange resin and emulsified asphalt, wherein the ion exchange resin modified emulsified asphalt consists of ion exchange resin, emulsified asphalt and an additive, the ion exchange resin is alkaline anion exchange resin, the emulsified asphalt is cation emulsified asphalt, and the additive is polyvinyl alcohol. The ion exchange resin modified emulsified asphalt prepared by the invention has the advantages of simple preparation process, strong storage stability, strong high-temperature resistance stability and the like, is suitable for high-temperature areas in summer, utilizes the solid waste of the ion exchange resin in an environment-friendly mode, and obtains the modified emulsified asphalt with excellent performance, thereby having great significance for environmental protection.
Description
Technical Field
The invention belongs to the technical field of road paving materials, and particularly relates to ion exchange resin modified emulsified asphalt and a preparation method thereof, in particular to ion exchange resin modified emulsified asphalt which is particularly suitable for cold-recycled asphalt pavement and a preparation method thereof.
Background
In recent years, the problems of energy consumption and resource consumption and environmental pollution in the pavement construction industry are attracting more and more attention. Compared with Hot Mix Asphalt (HMA) technology, cold Mix Asphalt (CMA) technology employing emulsified asphalt has significant advantages. Research indicates that compared with the HMA technology, the CMA technology reduces the heating process of asphalt and aggregate in the whole pavement construction process, can save more than 50 percent of energy sources, and only generates 33 percent of carbon dioxide and 17 percent of volatile organic compound emission in the production process. However, due to the addition of water and emulsifiers, the mechanical properties of emulsified asphalt and its blends are reduced, and the moisture in the Emulsified Asphalt (EA) has a direct impact on the rutting coefficient, recovery, complex modulus and fatigue life of the emulsified asphalt Evaporation Residue (EREA).
At present, the improvement of the emulsified asphalt performance is still a problem which is widely focused in the road construction field. Modification of emulsified asphalt is mainly focused on physical modification modes such as elastomer, plastomer, polymeric material and the like, and modification research from the angles of ions and reactive groups of the emulsified asphalt is relatively less. As a typical electric double layer structural material, emulsified asphalt differs from hot-mix asphalt due to its special ionic characteristics. Studies have shown that the type of emulsifier ions has a significant effect on the stability of the emulsified asphalt binder, and that the addition of salts or small solid particles can accelerate the coalescence of the asphalt emulsion only when the ions of the emulsified asphalt are opposite to the reactant ions. While the cohesiveness and stability of emulsified asphalt are also related to the solid wettability and electrical interactions between the asphalt droplets and minerals, the wettability being dependent on the interactions between the hydrophobized solid clusters and the asphalt molecules. The surfactant concentration must be set in order to establish a balance between the asphalt emulsion characteristics and the adhesion between asphalt and aggregate. Meanwhile, the pH of the emulsified asphalt has great influence on the stability of the emulsified asphalt, and the reasonable pH can control the water quantity in asphalt drops according to the suspension rheology theory, so that the adhesiveness and stability of the emulsified asphalt are better.
The ion exchange resin can dissociate lipophilic groups and hydrophilic groups in the solution, wherein the lipophilic groups can be mutually adsorbed with oily asphalt liquid drops, the hydrophilic groups are opposite to the ionic electricity of emulsified asphalt, and the ionic exchange resin has the condition of chemical reaction and can show interface properties. Therefore, the invention adopts the alkaline anion exchange resin to modify the emulsified asphalt, and provides a modified material with excellent performance for the cold-recycled asphalt pavement.
Disclosure of Invention
The invention aims to provide ion exchange resin modified emulsified asphalt and a preparation method thereof, wherein the ion exchange resin modified emulsified asphalt is composed of emulsified asphalt, ion exchange resin and additives, and finally the emulsified asphalt with excellent performance is formed under the normal temperature condition. The invention can provide the modified emulsified asphalt which is simple in preparation, low in cost, strong in storage stability, high in viscosity and strong in high-temperature resistance stability.
The invention adopts the following technical scheme:
the ion exchange resin modified emulsified asphalt comprises the following components in parts by weight: 100 parts of emulsified asphalt, 10-40 parts of ion exchange resin and 0.2-1 part of additive.
Further, the emulsified asphalt is a slow-cracking cationic emulsified asphalt, is in a black brown emulsion, and has the technical index of evaporation residues not lower than the following characteristics.
Further, the ion exchange resin is a strong alkaline anion exchange resin, is solid brown-yellow to golden yellow spherical particles at normal temperature, and has quaternary ammonium groups [ -N (CH) 3 ) 3 OH]Styrene-divinylbenzene copolymer having a crosslinking degree of not less than 7% is dissociated in the solution to form anionic and lipophilic groups.
Further, the additive is an additive of m-benzene type unsaturated polyester long afterglow aggregate, is polyvinyl alcohol, has the appearance of white flaky, flocculent or powdery solid, is slightly soluble in dimethyl sulfoxide, is insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, ethylene glycol and the like, has the viscosity of 3-70, the pH value of 4.5-6.5, the drying weight loss of less than or equal to 5.0, the acid value of less than or equal to 3.0, and the alcoholysis degree of 85-89.
The preparation method of the ion exchange resin modified emulsified asphalt comprises the following steps:
step 1: at normal temperature, adding the additive into the emulsified asphalt according to the mixing amount of 0.2-1.0 part by mass of the emulsified asphalt, and stirring at the stirring speed of 100-500 rpm for 1-3min to form the mixing liquid A.
Step 2: adding 10-40 parts of strong-alkaline anion exchange resin into the mixed solution A according to the mass of the emulsified asphalt at normal temperature, stirring at the stirring speed of 100-500 rpm for 2-4min, and preparing the ion exchange resin modified emulsified asphalt.
The beneficial effects of the invention are as follows:
1. the preparation of the ion exchange resin modified emulsified asphalt is simple;
2. the ion exchange resin modified emulsified asphalt can be modified at normal temperature, and the prepared modified emulsified asphalt has strong storage stability;
3. the prepared ion exchange resin modified emulsified asphalt has high viscosity;
4. the prepared ion exchange resin modified emulsified asphalt has strong high temperature stability.
Detailed Description
Through a great number of experimental researches and repeated verification, the invention discovers the ion exchange resin modified emulsified asphalt and the optimal preparation method thereof. The practice of the invention will now be described in detail with reference to a few representative examples, which are not intended to limit the invention.
Example 1
Adding 0.2 part of polyvinyl alcohol into 100 parts of cationic emulsified asphalt at room temperature, stirring for 3min under the condition of a stirrer with the rotating speed of 500 revolutions per minute, and sealing and preserving the obtained mixing liquid A;
under the condition of room temperature, 10 parts of strong alkaline anion exchange resin is added into the mixing solution A, and the mixture is stirred for 2 minutes under the condition of a stirrer with the rotating speed of 500 revolutions per minute, so as to obtain the ion exchange resin modified emulsified asphalt.
Placing the ion exchange resin modified emulsified asphalt into an aluminum cylinder, then placing the aluminum cylinder on an electric furnace or a gas furnace (with an asbestos pad), heating the aluminum cylinder slowly until the moisture in the sample is completely evaporated, and then heating the aluminum cylinder at 163+/-3.0 ℃ for 1min to obtain the evaporation residue of the ion exchange resin modified emulsified asphalt.
Example 2
Adding 0.4 part of polyvinyl alcohol into 100 parts of cationic emulsified asphalt at room temperature, stirring for 3min under the condition of a stirrer with the rotating speed of 500 revolutions per minute, and sealing and preserving the obtained mixing liquid A;
under the condition of room temperature, adding 20 parts of strong alkaline anion exchange resin into the mixing solution A, and stirring for 2min under the condition of a stirrer with the rotating speed of 500 revolutions per minute to obtain the ion exchange resin modified emulsified asphalt.
The ion exchange resin modified emulsified asphalt evaporation residue was the same as in example 1.
Example 3
Adding 0.6 part of polyvinyl alcohol into 100 parts of cationic emulsified asphalt at room temperature, stirring for 3min under the condition of a stirrer with the rotating speed of 500 revolutions per minute, and sealing and preserving the obtained mixing liquid A;
under the condition of room temperature, 30 parts of strong alkaline anion exchange resin is added into the mixing solution A, and the mixture is stirred for 2 minutes under the condition of a stirrer with the rotating speed of 500 revolutions per minute, so as to obtain the ion exchange resin modified emulsified asphalt.
The ion exchange resin modified emulsified asphalt evaporation residue was the same as in example 1.
Example 4
Adding 0.8 part of polyvinyl alcohol into 100 parts of cationic emulsified asphalt at room temperature, stirring for 3min under the condition of a stirrer with the rotating speed of 500 revolutions per minute, and sealing and preserving the obtained mixing liquid A;
under the condition of room temperature, 40 parts of strong alkaline anion exchange resin is added into the mixing solution A, and the mixture is stirred for 2 minutes under the condition of a stirrer with the rotating speed of 500 revolutions per minute, so as to obtain the ion exchange resin modified emulsified asphalt.
The ion exchange resin modified emulsified asphalt evaporation residue was the same as in example 1.
Example 5
Adding 1.0 part of polyvinyl alcohol into 100 parts of cationic emulsified asphalt at room temperature, stirring for 3min under the condition of a stirrer with the rotating speed of 500 revolutions per minute, and sealing and preserving the obtained mixing liquid A;
50 parts of strong alkaline anion exchange resin is added into the mixing solution A at room temperature, and the mixture is stirred for 2min under the condition of a stirrer with the rotating speed of 500 revolutions per minute, so as to obtain the ion exchange resin modified emulsified asphalt.
The ion exchange resin modified emulsified asphalt evaporation residue was the same as in example 1.
Comparative example
100 parts of cationic emulsified asphalt was taken as a comparative example at room temperature.
The modified emulsified asphalt evaporation residue was the same as in example 1.
The conductivity and pH tests are carried out on the examples 1-5 and the comparative examples, and the influence of the internal ionic strength and the storage stability of the modified emulsified asphalt is analyzed; and meanwhile, penetration, softening point and ductility tests are carried out on the modified emulsified asphalt evaporation residues to represent the basic properties of the modified emulsified asphalt evaporation residues by different blending amounts of resins. The various test conditions and test results are as follows:
1. conductivity and pH test
The prepared ion exchange resin modified emulsified asphalt was tested for conductivity and pH in examples and comparative examples using a DDSJ-308A conductivity meter and a PHSJ-4A pH meter, and the test results are shown in Table 1 below.
TABLE 1
As can be seen from Table 1, the conductivities of examples 1-5 were all increased and the pH was decreased compared to the comparative examples. Examples 1-5 emulsified asphalt showed an increasing tendency to increase in conductivity with increasing resin loadingThe potential increased from 4.50ms/cm to 19.38ms/cm. The resin was further added after the addition amount was 40%, and the rate of conductivity increase was slowed down. The ion exchange resin improves the capability of the modified suspension to release ions, the conductivity of the modified emulsified asphalt is further improved after the resin is added, the strength of the released ions is increased, and the stability of the multiphase suspension is further improved; as the amount of resin incorporated increases continuously, the ionization effect of the resin in the asphalt emulsion decreases, the degree of ion exchange with emulsified asphalt decreases, and the rate of conductivity increase decreases. The pH of the emulsified asphalt gradually decreases along with the increase of the blending amount of the resin, and the acidity is enhanced. The prior researches show that the cationic emulsified asphalt can promote the reaction of ammonium molecules to produce cationic molecules (ammonium salt molecules) under the acidic condition, and can exert the stability and the bonding performance. At lower pH, the resin has higher use efficiency of functional groups and large ion adsorption capacity. H + The increase of the (3) can change the ionization balance of the modified emulsified asphalt, increase the thickness of the double electric layers of the resin-asphalt combined structure and strengthen the stability of the modified emulsified asphalt. However, when the resin content exceeds 30%, the cationic emulsified asphalt H + Too high a concentration may instead destroy the structure of the electric double layer, causing demulsification, which is a decrease in the rate of rise of conductivity. In conclusion, the analysis can be carried out, the proper mixing amount of the regenerated resin modified emulsified asphalt can enhance the electron release intensity of asphalt emulsion, increase the thickness of a diffusion layer, enhance the stability of multiphase suspension and delay the demulsification of the emulsified asphalt.
2. Three major indexes
Penetration, softening point and ductility tests were carried out on the evaporation residues of the modified emulsified asphalt of examples 1 to 5 and comparative examples according to the specification of test procedure for asphalt and asphalt mixtures for highway engineering (JTG E20-2011) to characterize the influence of different amounts of resin on the basic properties of the evaporation residues of the emulsified asphalt. The test results are shown in Table 2.
TABLE 2
As can be seen from Table 2, the penetration and ductility of the modified emulsified asphalt of examples 1 to 5 as a whole tended to decrease and the softening point gradually increased as compared with the comparative example. The reason for this phenomenon is that the regenerated resin is added into the emulsified asphalt, which can dissociate lipophilic groups, and can form a macromolecular structure after being combined with asphalt molecules, so that the agglomeration capacity of evaporation residues is increased; and the mechanical strength of the resin is high, the combination of the two leads to the integral hardening of the asphalt, and the penetration is reduced. When the resin blending amount reaches 30%, the penetration rises briefly from 42.6mm to 44.4mm, and the penetration further decreases. This is probably because the combination of 30% of the lipophilic groups of the resin and the asphalt molecules reaches a state of equilibrium with each other, and the balance is broken when the blending amount is further increased. The modified asphalt is unstable, the superfluous resin is insufficiently dissociated, the bonding effect with asphalt molecules is poor, and the phenomenon of mutually agglomerating and agglomerating in asphalt occurs, so that the penetration degree is reduced. In general, the appropriate amount of resin will harden its evaporation residue, enhancing the high temperature performance of the emulsified asphalt.
As can be seen from Table 2, the ductility of the modified emulsified asphalt residues of examples 1 to 5 was reduced from 401.30mm to 214.65mm by 46.5% as compared to the comparative example. For this reason, in the evaporation residue, plastic deformation of asphalt plays a decisive role in ductility. The adhesion between asphalt is weak, and the plastic deformability of the bonding phase formed by the resin between asphalt is poor, and a deformation weak area is generated with modified asphalt, so that the ductility of emulsified asphalt is reduced.
As can be seen from Table 2, the softening point of the modified emulsified asphalt residues of examples 1 to 5 was in an ascending trend with the addition amount of the regenerated resin, and the softening reached 57.08 ℃and increased by 6.1% at 20% in comparison with the comparative example; when the blending amount is more than 20%, the softening point increase rate is retarded. The resin is adopted as the emulsified asphalt modifier to harden the whole asphalt, and the modified emulsified asphalt is weakened under the influence of temperature along with the continuous increase of the blending amount of the resin, the temperature sensitivity is reduced, and the high-temperature performance of the emulsified asphalt is improved.
The three indexes of the comprehensive regenerated resin modified emulsified asphalt show that the adoption of the resin modified emulsified asphalt can thicken and harden the evaporation residue of the emulsified asphalt, enhance the high-temperature performance of the emulsified asphalt, and reduce the cracking resistance. When the mixing amount of the resin is 30%, the bonding state between the resin and the asphalt is optimal, the regenerated resin can fully exert the performance, and the resin modified emulsified asphalt can show relatively good plastic deformation capability and good high-temperature performance.
The reagents used in the present invention are all commercially available, and the methods used in the present invention are all conventional methods unless otherwise specified.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. An ion exchange resin modified emulsified asphalt, which is characterized in that: comprises the following components in parts by weight: 100 parts of emulsified asphalt, 10-50 parts of ion exchange resin and 0.2-1 part of additive;
the emulsified asphalt is slow-cracking cationic emulsified asphalt, is black brown emulsion, has penetration of more than or equal to 60.0.1mm at 25 ℃ of evaporation residues, has a softening point of 50-55 ℃ and has ductility of more than or equal to 40cm at 10 ℃;
the ion exchange resin is a strong alkaline anion exchange resin with quaternary ammonium groups [ -N (CH 3) 3OH ] and styrene-divinylbenzene copolymer with the crosslinking degree not lower than 7%;
the additive is polyvinyl alcohol.
2. A method for preparing the ion exchange resin modified emulsified asphalt as set forth in claim 1, wherein: the method comprises the following steps:
adding the additive into the emulsified asphalt according to the mixing amount of 0.2-1.0 part by weight of the emulsified asphalt at normal temperature, and stirring at the stirring speed of 100-500 r/min for 1-3min;
and adding 10-40 parts of strong-alkaline anion exchange resin into the mixed solution according to the mass of the emulsified asphalt, and stirring at the stirring speed of 100-500 rpm for 2-4min to obtain the ion exchange resin modified emulsified asphalt.
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2022
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