CN115073928A - Phenolic resin modified asphalt and preparation method thereof - Google Patents
Phenolic resin modified asphalt and preparation method thereof Download PDFInfo
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- 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
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The application relates to the technical field of road building materials, and particularly discloses phenolic resin modified asphalt and a preparation method thereof. The phenolic resin modified asphalt comprises the following raw materials in parts by weight: the asphalt comprises petroleum asphalt, glass fiber, modified phenolic resin, organic carboxylic acid, rock asphalt and a stabilizer, wherein the stabilizer is prepared by mixing an initiator, an activator and a cross-linking agent, and the mixing mass ratio of the initiator, the activator and the cross-linking agent is (1.0-1.2) to (1.0-1.5) to (1.0-1.2); the preparation method comprises the following steps: the first step is as follows: mixing the modified phenolic resin with petroleum asphalt, adding glass fiber and polyethylene resin, and adding rock asphalt to obtain a mixture; the second step is that: and adding terephthalic acid into the mixture, and then adding a stabilizer to obtain the asphalt with strong thermal stability. The phenolic resin modified asphalt can be used for concrete roads and has the advantage of improving the thermal stability of asphalt.
Description
Technical Field
The application relates to the technical field of road building materials, in particular to phenolic resin modified asphalt and a preparation method thereof.
Background
The asphalt is a black brown complex mixture composed of hydrocarbons with different molecular weights and nonmetal derivatives thereof, is one of high-viscosity organic liquids, mostly exists in a liquid or semisolid petroleum form, has a black surface, and can be dissolved in carbon disulfide and carbon tetrachloride. Asphalt is a waterproof, moistureproof and anticorrosive organic cementing material, and is mainly used in the industries of coatings, plastics, rubber and the like, pavement and the like.
At present, the total mileage of the expressway in China breaks through one hundred thousand kilometers. Asphalt pavement has become the first choice for road pavement from long-term benefits and later operation and maintenance. However, as the road pavement damages become more serious with the climate change and the increase of load, the requirements on the quality of the road materials are higher and higher. The main diseases of the asphalt pavement are as follows: the pavement asphalt pavement of the highway is mainly cracked due to insufficient strength of the pavement, and the cracking is mainly caused by that the surface layer of the asphalt is aged along with the increase of time due to the change of temperature.
The measures for solving the problems of the prior asphalt pavement mainly comprise strictly controlling the proportion of the asphalt mixture, strengthening the control on the base layer of the asphalt pavement, avoiding the unstable mixture of paving and the like. However, the problems of asphalt itself are not solved, and the problem of insufficient stability of the asphalt mixture is not improved. Although the research on the modified asphalt has been made, the inventors found that the obtained modified asphalt has poor thermal stability in practical application, the aging problem still needs to be improved, and the asphalt has poor stability due to the temperature change during the use.
Disclosure of Invention
In order to improve the thermal stability of asphalt, the application provides phenolic resin modified asphalt.
In a first aspect, the present application provides a phenolic resin modified asphalt, which adopts the following technical scheme:
the phenolic resin modified asphalt comprises the following raw materials in parts by weight:
95-100 parts of petroleum asphalt, 1.2-1.8 parts of glass fiber, 2-4 parts of modified phenolic resin, 0.8-1.6 parts of organic carboxylic acid, 5-10 parts of rock asphalt and 2-5 parts of stabilizer, wherein the stabilizer is prepared by mixing an initiator, an activator and a cross-linking agent, and the mixing mass ratio of the initiator, the activator and the cross-linking agent is (1.0-1.2) to (1.0-1.5) to (1.0-1.2).
By adopting the technical scheme, the asphalt is modified by adopting the modified phenolic resin as the modifier, the phenolic resin is prepared by condensation polymerization of phenol and formaldehyde under the condition of a catalyst, neutralization and washing, the phenolic resin has the most important characteristic of high temperature resistance, the structure and the size of the phenolic resin can be kept at high temperature, and the phenolic resin is also used as a binder and can be compatible with various organic and inorganic fillers.
The phenolic resin can reduce phenolic compounds and aldehyde compounds by adding the organic carboxylic acid, and the phenolic compounds in the phenolic resin can chemically react with mineral oil in the petroleum asphalt to form macromolecules so as to enhance the stability of the asphalt; the aldehyde compound reacts with the aliphatic compound to obtain aliphatic aldehyde, the aliphatic aldehyde is a good organic solvent, organic substances in the asphalt can be more easily compatible, an asphalt system can be more stable, the property of the asphalt is less affected by temperature, the thermal stability of the modified asphalt is improved, and meanwhile, oil and fat substances in the asphalt are reduced, so that the oil-spreading condition of the asphalt pavement is improved.
The glass fiber has high heat resistance, and the addition of the glass fiber can further improve the heat stability of the modified asphalt; and the glass fiber is used as a reinforcing material in the composite material, so that the elasticity coefficient is high, the rigidity is good, and the elasticity of the asphalt can be enhanced after the glass fiber is added into the asphalt.
Optionally, the modified phenolic resin comprises the following raw materials in parts by weight: 80-100 parts of phenol, 55-75 parts of formaldehyde, 15-16 parts of methyllithium, 20-30 parts of vitamin C, 30-40 parts of nitrile rubber and 15-20 parts of curing agent.
By adopting the technical scheme, the added methyl lithium blocks phenolic hydroxyl groups by utilizing the coordination reaction of metal organic compound ions and oxygen atoms, so that the heat resistance of the resin is improved, one metal organic compound ion can react with a plurality of phenolic hydroxyl groups, and the metal organic compound ion also plays a role of a cross-linking agent in the resin. The nitrile rubber and the phenolic resin are subjected to copolymerization reaction, the nitrile rubber is a good internal toughening agent of the phenolic resin, and the toughening of the phenolic resin is better realized.
Optionally, the modified phenolic resin is modified by the following steps:
s1, mixing phenol and formaldehyde at the temperature of 80-90 ℃ under the alkaline condition, adding methyllithium after mixing, and adding vitamin C;
s2, adding nitrile rubber to mix the phenolic resin and the nitrile rubber;
and S3, adding a curing agent, and stirring and mixing to obtain the modified phenolic resin.
By adopting the technical scheme, the phenolic resin is modified, then the modified phenolic resin is added into the petroleum asphalt raw material, and the asphalt is modified by the modified phenolic resin, so that the stability and the ageing resistance of the asphalt can be better improved. After phenol and formaldehyde are mixed, metal organic compound methyllithium is added, condensation polymerization is carried out, the methyllithium blocks phenolic hydroxyl and methylene, oxidation of phenolic hydroxyl is inhibited, heat resistance of phenolic resin is improved, ions in the metal organic compound methyllithium can react with a plurality of phenolic hydroxyl, a cross-linking agent is also acted in the resin, vitamin C is added, an anti-oxidation effect is achieved, the methylene is not oxidized any more, the phenolic resin is enabled to be more stable, through adding of nitrile butadiene rubber, a relatively ideal toughening effect can be achieved, a curing agent is added at last, the phenolic resin is enabled not to flow any more, curing reaction is carried out, and the phenolic resin can exist more stably after being modified.
Optionally, the initiator is a hydroperoxide initiator, the activator is stearic acid, and the crosslinking agent is dicumyl peroxide.
By adopting the technical scheme, the stabilizing agent comprises an initiator, an activating agent and a cross-linking agent, the initiator is hydroperoxide, the cross-linking agent is dicumyl peroxide, the activating agent is stearic acid, the cross-linking agent is dicumyl peroxide, and the stability of the asphalt is weakened after the asphalt is modified by the phenolic resin.
Optionally, the raw material of the phenolic resin modified asphalt also comprises 10-15 parts by weight of polyethylene resin.
By adopting the technical scheme, after the polyethylene resin is added into the asphalt, the thermal stability is improved, the cohesive force of the asphalt and the stone adhesion of later mixing are also improved, and the thermal stability of the modified asphalt is further improved.
Optionally, the curing agent is hexamethylenetetramine.
By adopting the technical scheme, the phenolic resin is subjected to acid catalytic reaction to obtain the thermoplastic phenolic resin, the thermoplastic phenolic resin is reacted with hexamethylenetetramine, polymerization of a soft chain segment in the modifier can be induced during curing reaction, and the number of thermoplastic phenolic resin polymers is increased after reaction, so that the stability is improved.
Optionally, the organic carboxylic acid is terephthalic acid.
By adopting the technical scheme, the terephthalic acid is a raw material for producing the polyester, the full combination of the phenolic compound and the aldehyde compound can be promoted by adding the terephthalic acid, so that the combination of the phenolic resin and the added substances is more stable during modification, an acid environment is provided for the phenolic resin modified asphalt, the dibenzoic acid is used as a catalyst, the addition polycondensation reaction of the phenolic resin can be catalyzed by the phenolic resin in hydrochloric acid, sulfuric acid, phosphoric acid, oxalic acid and other inorganic acids, and the excessive phenol is obtained to obtain the thermoplastic phenolic resin.
In a second aspect, the present application provides a method for preparing phenolic resin modified asphalt, which adopts the following technical scheme: a preparation method of phenolic resin modified asphalt comprises the following steps:
the first step is as follows: heating the petroleum asphalt and the rock asphalt to 165-170 ℃, mixing the modified phenolic resin with the heated petroleum asphalt, adding glass fiber, and then adding the rock asphalt to obtain a mixture;
the second step: and adding terephthalic acid and a stabilizer into the mixture to obtain the phenolic resin modified asphalt.
Through adopting above-mentioned technical scheme, the phenolic resin cross-linking nature after the modification strengthens, make pitch can combine with a lot of macromolecular substance, phenolic resin after the modification mixes with petroleum pitch, make organic substance in the petroleum pitch can take place chemical reaction with phenolic resin in the acidity, add glass fiber and polyethylene resin after chemical reaction forms the macromolecule again, make the thermoplasticity of pitch improve, the heat resistance has also obtained the improvement, then add the stabilizer, make pitch more stable after being modified by phenolic resin, the degradation of phenolic resin has been avoided, thereby reach the purpose that phenolic resin modified pitch system is stable and long-term heat storage.
Optionally, the raw material of the phenolic resin modified asphalt further comprises 10-15 parts by weight of polyethylene resin, and the polyethylene resin and the glass fiber are added simultaneously.
Through adopting above-mentioned technical scheme, add polyethylene resin and glass fiber simultaneously and can make modified asphalt's heat resistance improve by a wide margin, and then make modified asphalt's thermal stability better, fibre and resin are mutually supported for macromolecular substance increases, and then has improved stability.
In summary, the present application has the following beneficial effects:
1. this application adopts modified phenolic resin as the modifier, modify pitch, utilize its heat stability on the one hand, improve modified asphalt's heat stability, and phenolic resin is as the binder, can both be compatible with various organic and inorganic fillers, consequently, regard phenolic resin as the modifier of pitch, can make the heat stability of pitch strengthen, can also make organic matter in the pitch and inorganic matter compatible together, make the pitch system more stable, the effect of pitch heat stability reinforcing has been obtained.
2. The application adopts the modified phenolic resin, can better improve the stability and the aging resistance of the asphalt, adds the metal organic compound methyllithium after the phenol and the formaldehyde are mixed, then carries out polycondensation reaction, so that methyllithium blocks phenolic hydroxyl and methylene, inhibits the oxidation of phenolic hydroxyl, improves the heat resistance of the phenolic resin, ions in the metal organic compound methyllithium can react with a plurality of phenolic hydroxyl, the resin also has the function of a cross-linking agent, and vitamin C is added to play a role in antioxidation and prevent methylene from being oxidized any more, thereby leading the phenolic resin to be more stable, achieving more ideal toughening effect by adding the nitrile rubber, finally adding the curing agent, the phenolic resin does not flow any more and is subjected to a curing reaction, so that the phenolic resin does not flow any more and is subjected to the curing reaction, and the modified phenolic resin has a more stable existence effect.
3. In the preparation method of the modified asphalt, the modified phenolic resin is mixed with the petroleum asphalt, so that organic substances in the petroleum asphalt can chemically react with the phenolic resin in acidity, the glass fiber and the polyethylene resin are added after the chemical reaction forms macromolecules, the thermoplasticity of the asphalt is improved, the heat resistance is also improved, then the stabilizer is added, the asphalt is more stable after being modified by the phenolic resin, the degradation of the phenolic resin is avoided, the purposes of stability and long-term heat storage of a phenolic resin modified asphalt system are achieved, the fine aggregate is added to combine the asphalt with more inorganic macromolecules, and the effect of enhancing the heat stability of the asphalt is obtained.
Detailed Description
The present application is further described in detail with reference to the following examples, which are specifically illustrated by the following: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples are available from ordinary commercial sources unless otherwise specified.
The petroleum asphalt is No. 70 matrix asphalt; the hydroperoxide initiator is cumene hydroperoxide.
Preparation examples of starting materials and intermediates
Preparation example 1
A modified phenolic resin comprises the following modification steps:
s1, mixing 80Kg of phenol with 55Kg of formaldehyde at 90 ℃ and under the condition that the PH value is 9, mixing for 0.5h, adding 15Kg of methyllithium after mixing, adding 20Kg of vitamin C, and mixing for 20min to obtain phenolic resin;
s2, adding 30Kg of nitrile rubber, and mixing for 0.5h to mix the phenolic resin with the nitrile rubber;
s3, adding 15Kg of curing agent which is hexamethylenetetramine, and mixing for 20min to obtain the modified phenolic resin.
Preparation example 2
A modified phenolic resin comprises the following modification steps:
s1, mixing 90Kg of phenol with 65Kg of formaldehyde at 90 ℃ and under the condition that the PH value is 9, mixing for 0.5h, then adding 15Kg of methyllithium, adding 25Kg of vitamin C, and mixing for 20min to obtain phenolic resin;
s2, adding 35Kg of nitrile rubber, and mixing for 0.5h to mix the phenolic resin with the nitrile rubber;
s3, adding 16Kg of curing agent which is hexamethylenetetramine, and mixing for 20min to obtain the modified phenolic resin.
Preparation example 3
A modified phenolic resin comprises the following modification steps:
s1, mixing 100Kg of phenol with 75Kg of formaldehyde at 90 ℃ and under the condition that the PH value is 9, mixing for 0.5h, adding 16Kg of methyllithium after mixing, adding 30Kg of vitamin C, and mixing for 20min to obtain phenolic resin;
s2, adding 40Kg of nitrile rubber, and mixing for 0.5h to mix the phenolic resin with the nitrile rubber;
and S3, adding 20Kg of curing agent which is hexamethylenetetramine, and mixing for 20min to obtain the modified phenolic resin.
Comparative preparation example 1
A modified phenol resin was produced in the same manner as in production example 3, except that methyllithium was not added in step S1.
Comparative preparation example 2
A modified phenol resin was produced in the same manner as in production example 3, except that nitrile rubber was not added in step S2.
Examples
Example 1
A preparation method of phenolic resin modified asphalt comprises the following steps:
the first step is as follows: mixing 95Kg of petroleum asphalt with 5Kg of rock asphalt, heating to 170 ℃, stirring for 1 hour, taking 2Kg of the modified phenolic resin prepared in preparation example 2, adding the stirred petroleum asphalt, mixing for 0.5 hour, adding 1.2Kg of glass fiber, and mixing for 20min to obtain a mixture;
the second step is that: 0.8Kg of terephthalic acid is added into the mixture, and then 2Kg of stabilizer is added after 15min of mixing, and the mixture is mixed for 10min to obtain the phenolic resin modified asphalt.
The stabilizer is prepared by mixing an initiator, an activating agent and a crosslinking agent, wherein the mixing mass ratio of the initiator, the activating agent and the crosslinking agent is 1.0:1.0:1.0, the initiator is cumene hydroperoxide, the activating agent is stearic acid, and the crosslinking agent is dicumyl peroxide.
Example 2
A preparation method of phenolic resin modified asphalt comprises the following steps:
the first step is as follows: mixing 97Kg of petroleum asphalt with 8Kg of rock asphalt, heating to 170 ℃, stirring for 1h, adding 3Kg of the modified phenolic resin prepared in preparation example 2 to the stirred petroleum asphalt, mixing for 0.5h, adding 1.6Kg of glass fiber, and mixing for 20min to obtain a mixture;
the second step is that: 1.2Kg of terephthalic acid is added into the mixture, and then 4Kg of stabilizer is added after 15min of mixing, and the mixture is mixed for 10min to obtain the phenolic resin modified asphalt.
The stabilizer is prepared by mixing an initiator, an activating agent and a crosslinking agent, wherein the mixing mass ratio of the initiator, the activating agent and the crosslinking agent is 1.2:1.3:1.0, the initiator is cumene hydroperoxide, the activating agent is stearic acid, and the crosslinking agent is dicumyl peroxide.
Example 3
A preparation method of phenolic resin modified asphalt comprises the following steps:
the first step is as follows: mixing 100Kg of petroleum asphalt with 10Kg of rock asphalt, heating to 170 ℃, stirring for 1h, taking 4Kg of the modified phenolic resin prepared in preparation example 2, adding the stirred petroleum asphalt, mixing for 0.5h, adding 1.8Kg of glass fiber, and mixing for 20min to obtain a mixture;
the second step is that: 1.6Kg of terephthalic acid is added into the mixture, and 5Kg of stabilizer is added after 15min of mixing and 10min of mixing to obtain the phenolic resin modified asphalt.
The stabilizer is prepared by mixing an initiator, an activating agent and a crosslinking agent, wherein the mixing mass ratio of the initiator, the activating agent and the crosslinking agent is 1.2:1.5:1.2, the initiator is cumene hydroperoxide, the activating agent is stearic acid, and the crosslinking agent is dicumyl peroxide.
Example 4
A phenolic resin modified asphalt, carried out according to the method in example 2, with the exception that the modified asphalt further comprised 10Kg of polyethylene resin, which was added simultaneously with the glass fibers.
Example 5
A phenolic resin modified asphalt, carried out according to the method in example 2, with the exception that the modified asphalt further comprised 15Kg of polyethylene resin, which was added simultaneously with the glass fibers.
Comparative example
Comparative example 1
A method for producing asphalt, which is different from example 2 in that: heating 100Kg of petroleum asphalt and 10Kg of rock asphalt to 170 ℃, and stirring and mixing to obtain the asphalt.
Comparative example 2
The preparation method of the phenolic resin modified asphalt is different from the preparation method of the example 2 in that: the raw materials are not added with modified phenolic resin.
Comparative example 3
A method for preparing modified asphalt, which is different from the method in example 2 in that: the modified phenolic resin is replaced by phenolic resin in equal amount.
Comparative example 4
A method for preparing modified asphalt, which is different from the method in example 2 in that: the modified phenolic resin is replaced by epoxy resin in equal amount.
Comparative example 5
The preparation method of the phenolic resin modified asphalt is different from the preparation method of the example 2 in that: no stabilizer was added to the raw materials.
Comparative example 6
The preparation method of the phenolic resin modified asphalt is different from the preparation method of the example 2 in that: no organic carboxylic acid was added to the starting material.
Comparative example 7
The preparation method of the phenolic resin modified asphalt is different from the preparation method of the example 2 in that: organic sulfonic acids are used instead of organic carboxylic acids.
Comparative example 8
The preparation method of the phenolic resin modified asphalt is different from the preparation method of the example 2 in that: glass fibers were not added to the raw materials.
Comparative example 9
The preparation method of the phenolic resin modified asphalt is different from the preparation method of the example 2 in that: natural fibers are used to replace glass fibers.
Comparative example 10
The preparation method of the phenolic resin modified asphalt is different from the preparation method of the example 2 in that: the modified phenolic resin prepared in comparative preparation example 1 was used as the modified phenolic resin.
Comparative example 11
The preparation method of the phenolic resin modified asphalt is different from the preparation method of the example 2 in that: the modified phenolic resin prepared in comparative preparation example 2 was used as the modified phenolic resin.
Performance test
The phenol resin modified asphalts prepared in examples 1 to 5 and comparative examples 1 to 8 were subjected to a performance test.
The thermal stability was carried out as follows:
the stability of the mixture prepared by the method is tested by a water immersion marshall stability test according to road engineering asphalt and asphalt mixture test specification (JTKG/E20-2011), a four-point bending fatigue test by an MTS universal tester, and taking complete fracture of the mixture as a failure standard, and the test results are shown in table 1.
TABLE 1 asphalt stability test results
| Item | Marshall stability/KN | Adhesive strength/MPa |
| Example 1 | 14.45 | 2.25 |
| Example 2 | 14.58 | 2.56 |
| Example 3 | 14.49 | 2.36 |
| Example 4 | 14.68 | 2.59 |
| Example 5 | 14.75 | 2.64 |
| Comparative example 1 | 8.81 | 1.23 |
| Comparative example 2 | 9.83 | 1.85 |
| Comparative example 3 | 10.52 | 2.12 |
| Comparative example 4 | 10.36 | 2.18 |
| Comparative example 5 | 11.22 | 2.18 |
| Comparative example 6 | 12.52 | 2.20 |
| Comparative example 7 | 12.83 | 2.23 |
| Comparative example 8 | 13.15 | 2.19 |
| Comparative example 9 | 13.80 | 2.21 |
| Comparative example 10 | 14.35 | 2.36 |
| Comparative example 11 | 14.41 | 2.42 |
As can be seen by combining the examples and comparative examples and by combining Table 1, the modified asphalt prepared in the examples of the present application has higher bonding strength and Marshall stability, and the asphalt prepared in the examples of the present application has better heat stability than the comparative examples.
Examples 4-5 compared with example 2, the Marshall stability and cohesive strength of examples 4-5 were both higher, which shows that the addition of polyethylene resin can further improve the thermal stability of asphalt, and the addition of polyethylene resin into asphalt improves the temperature stability and improves the cohesive force of asphalt.
In comparison with comparative example 1 and example 2, the Marshall stability and the bonding strength in comparative example 1 are greatly reduced, which shows that the thermal stability is lower when the unmodified asphalt is mixed together.
Comparative example 2 the marshall stability and bond strength in comparative example 2 were low compared to example 2, but slightly improved compared to comparative example 1, indicating that the addition of glass fiber can improve the thermal stability of asphalt to some extent, but the thermal stability is still poor, and the addition of modified phenolic resin in example 2 significantly improves the thermal stability.
In combination with the detection results of comparative example 3 and comparative example 4, the thermal stability of the asphalt is slightly improved by adding the phenolic resin in comparative example 3, but the thermal stability of the asphalt is far lower than that of the modified asphalt in example 2, and when the epoxy resin is added in comparative example 4, the thermal stability of the asphalt is slightly lower than that of the phenolic resin in comparative example 3.
In combination with the detection results of comparative examples 6 and 7, it can be seen that when the modified phenolic resin is added to the system but no carboxylic acid is added, the marshall stability and the bonding strength in comparative examples 5-6 are low, which indicates that the addition of the organic carboxylic acid enhances the stability of the asphalt because the phenolic resin can reduce phenolic compounds and aldehyde compounds, so that the phenolic compounds can better react with the mineral oil in the asphalt to form macromolecules, and the macromolecular system is more stable.
Compared with the example 2, the Marshall stability and the bonding strength in the comparative example 2 are low, but the Marshall stability and the bonding strength are improved compared with the comparative example 1, which shows that the stabilizer is used for modifying the asphalt to ensure that a colloid system is more stable, the thermal stability and the aging resistance are enhanced after the asphalt is modified, the stabilizer is used for synthesizing a high molecular material, so that the phenolic resin and the asphalt form an asphalt colloid system, the mutual crosslinking of the asphalt and the phenolic resin is realized, and the activation performance of the asphalt is enhanced under the action of the stearic acid serving as an activating agent.
Comparative examples 10-11 the Marshall stability and cohesive strength of comparative examples 10-11 are lower than example 2, but are much higher than comparative example 1, indicating that better thermal stability of the modified asphalt is obtained when the modified phenolic resin provided herein is used as a modifier in the modified asphalt.
Comparative examples 8-9 compared to example 2, comparative examples 7-8, which show that the addition of glass fibers to asphalt can increase the elasticity of asphalt because glass fibers are generally used as a reinforcing material in composites, have a high coefficient of elasticity and good stiffness, so that asphalt is not unstable due to temperature changes, have low marshall stability and low cohesive strength.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The phenolic resin modified asphalt is characterized by comprising the following raw materials in parts by weight:
95-100 parts of petroleum asphalt, 1.2-1.8 parts of glass fiber, 2-4 parts of modified phenolic resin, 0.8-1.6 parts of organic carboxylic acid, 5-10 parts of rock asphalt and 2-5 parts of stabilizer, wherein the stabilizer is prepared by mixing an initiator, an activator and a cross-linking agent, and the mixing mass ratio of the initiator, the activator and the cross-linking agent is (1.0-1.2) to (1.0-1.5) to (1.0-1.2).
2. The phenolic resin modified asphalt of claim 1, wherein: the modified phenolic resin is prepared from the following raw materials in parts by weight: 80-100 parts of phenol, 55-75 parts of formaldehyde, 15-16 parts of methyllithium, 20-30 parts of vitamin C, 30-40 parts of nitrile rubber and 15-20 parts of curing agent.
3. The phenolic resin modified asphalt of claim 2, wherein: the modified phenolic resin is prepared by modifying according to the following method:
s1, mixing phenol and formaldehyde at the temperature of 80-90 ℃ under the alkaline condition, adding methyllithium after mixing, adding vitamin C, and preparing phenolic resin;
s2, adding nitrile rubber to mix the phenolic resin and the nitrile rubber;
and S3, adding a curing agent, and stirring and mixing to obtain the modified phenolic resin.
4. The phenolic resin modified asphalt of claim 1, wherein: the initiator is a hydroperoxide initiator, the activating agent is stearic acid, and the crosslinking agent is dicumyl peroxide.
5. The phenolic resin modified asphalt of claim 1, wherein: the raw material of the phenolic resin modified asphalt also comprises 10-15 parts by weight of polyethylene resin.
6. The phenolic resin modified asphalt of claim 2, wherein: the curing agent is hexamethylenetetramine.
7. The phenolic resin modified asphalt of claim 1, wherein: the organic carboxylic acid is terephthalic acid.
8. The method for preparing phenolic resin modified asphalt according to claim 1, which comprises the following steps:
the first step is as follows: heating the petroleum asphalt and the rock asphalt to 165-170 ℃, mixing, stirring, mixing the modified phenolic resin with the heated petroleum asphalt, adding glass fiber, and adding the rock asphalt to obtain a mixture;
the second step is that: adding organic carboxylic acid into the mixture, and then adding a stabilizer to obtain the phenolic resin modified asphalt.
9. The method for preparing phenolic resin modified asphalt according to claim 8, wherein the phenolic resin modified asphalt comprises the following steps: the raw material of the phenolic resin modified asphalt also comprises 10-15 parts by weight of polyethylene resin, and the polyethylene resin and the glass fiber are added simultaneously.
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| CN115073928B (en) | 2023-03-31 |
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