CN115073928B - Phenolic resin modified asphalt and preparation method thereof - Google Patents
Phenolic resin modified asphalt and preparation method thereof Download PDFInfo
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- CN115073928B CN115073928B CN202210835096.8A CN202210835096A CN115073928B CN 115073928 B CN115073928 B CN 115073928B CN 202210835096 A CN202210835096 A CN 202210835096A CN 115073928 B CN115073928 B CN 115073928B
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- 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
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 paint, plastics, rubber and the like and 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-stage operation and maintenance. However, with the increasing climate change and load, road pavement diseases become more serious, and the requirements on the quality of 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 the 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 carried out, 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 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 compatible more easily, 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 substances in the asphalt are reduced, so that the oil bleeding 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, 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 with 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 the initiator, the activator and the cross-linking agent, the initiator is hydroperoxide, the cross-linking agent is dicumyl peroxide, the activator is stearic acid, the cross-linking agent is dicumyl peroxide, and the asphalt is modified by the phenolic resin and has weakened stability.
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-stage 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 thermoplastic phenolic resin is obtained by the phenolic resin under the acid catalysis reaction, the thermoplastic phenolic resin is reacted with the hexamethylenetetramine, the polymerization of a soft chain segment in the modifier can be induced during the curing reaction, the polymer of the thermoplastic phenolic resin is increased after the reaction, and 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 petroleum asphalt and rock asphalt to 165-170 ℃, 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: and adding terephthalic acid into the mixture, and then adding a stabilizer 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 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 asphalt, 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 filler, therefore, regard phenolic resin as the modifier of asphalt, can make the heat stability of asphalt strengthen, can also make organic matter and inorganic matter in the asphalt can both be compatible together, make the asphalt system more stable, the effect of asphalt heat stability reinforcing has been obtained.
2. This application adopts modified phenolic resin, the stability and the ageing resistance of improvement pitch that can be better, phenol and formaldehyde add metal organic compound methyllithium after mixing, carry out polycondensation reaction again, make methyllithium blockade phenol hydroxyl and methylene, the oxidation of phenol hydroxyl has been inhibited, phenolic resin's heat resistance has been improved, ion in metal organic compound methyllithium can react with a plurality of phenol hydroxyl, also play the cross-linking agent effect in the resin, add vitamin C, play the antioxidation, also can make the methylene no longer oxidized, and then make phenolic resin more stable, through adding butadiene-acrylonitrile rubber, can reach comparatively ideal toughening effect, add the curing agent at last, make phenolic resin no longer flow, take place the curing reaction, phenolic resin no longer flows, take place the curing reaction, make can more stable existence effect after the phenolic resin modification.
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 carried out according to 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 and 55Kg of formaldehyde for 0.5h at 90 ℃ and under the condition that the PH is =9, adding 15Kg of methyl lithium and 20Kg of vitamin C after mixing, 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;
and 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 and 65Kg of formaldehyde at 90 ℃ and under the condition that the PH =9, mixing for 0.5h, then adding 15Kg of methyllithium and 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;
and 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 and 75Kg of formaldehyde for 0.5h at 90 ℃ and under the condition that the PH is =9, adding 16Kg of methyllithium and 30Kg of vitamin C after mixing, 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 accordance with the method 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: 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 activator and a cross-linking agent, wherein the mixing mass ratio of the initiator to the activator to the cross-linking agent is 1.0.
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 into 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 activator and a cross-linking agent, wherein the mixing mass ratio of the initiator to the activator to the cross-linking agent is 1.2.
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: 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 to the activating agent to the crosslinking agent is 1.2.
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 product.
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 is added in 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 are 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 phenolic resin modified asphalts prepared in examples 1-5 and comparative examples 1-8 were tested for their properties.
The thermal stability was carried out as follows:
a water-immersion marshall stability test is performed according to road engineering asphalt and asphalt mixture test specification (JTKG/E20-2011), a four-point bending fatigue test is performed by using an MTS universal tester, the stability of the mixture prepared by the mixture preparation method is tested by taking complete fracture of the mixture as a failure standard, and 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 |
It can be seen from the combination of the examples and the comparative examples and the combination of Table 1 that the modified asphalt obtained in the examples of the present application has higher bonding strength and Marshall stability, and the asphalt obtained in the examples of the present application has better heat stability than the comparative examples.
Examples 4-5 compared with example 2, the results of examples 4-5 showed that the addition of polyethylene resin further improved the thermal stability of the asphalt, and the polyethylene resin added to the asphalt improved the temperature stability and also improved the cohesion of the asphalt.
When the results of comparative example 1 and example 2 are combined, the significant decrease in Marshall stability and cohesive strength in comparative example 1 indicates that the unmodified asphalt is less thermally stable when mixed together.
Comparative example 2 the marshall stability and cohesive 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 was still poor, and the addition of modified phenolic resin in example 2 significantly improved the thermal stability.
Combining 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 and combining the detection result of comparative example 2, 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, so that the effect of improving the thermal stability of the asphalt by adding the phenolic resin in the system is better than that of other resins, but the effect of improving the thermal stability of the asphalt by adding the phenolic resin in the system is still far lower than that of the modified phenolic resin in the examples.
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 macromolecule system is more stable.
Compared with the example 2, the comparative example 5 has lower marshall stability and bonding strength in the comparative example 2, but is improved compared with the comparative example 1, which shows that the stabilizer modifies the asphalt to ensure that a colloid system is more stable, and the thermal stability and the aging resistance of the modified asphalt are enhanced.
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 specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (6)
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, the initiator is a hydroperoxide initiator, the activator is stearic acid, the cross-linking agent is dicumyl peroxide, and the mixing mass ratio of the hydroperoxide initiator, the stearic acid and the dicumyl peroxide is (1.0-1.2) to (1.0-1.5) to (1.0-1.2); 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; the organic carboxylic acid is terephthalic acid.
2. The phenolic resin modified asphalt of claim 1, 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 an alkaline condition, adding methyllithium after mixing, and adding vitamin C to prepare phenolic resin;
s2, adding nitrile rubber to mix the phenolic resin with the nitrile rubber;
and S3, adding a curing agent, and stirring and mixing to obtain the modified phenolic resin.
3. 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.
4. The phenolic resin modified asphalt as claimed in claim 2, wherein: the curing agent is hexamethylenetetramine.
5. The method for preparing the phenolic resin modified asphalt according to claim 1, comprising the following steps:
the first step is as follows: heating petroleum asphalt and 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: adding organic carboxylic acid into the mixture, and then adding a stabilizer to obtain the phenolic resin modified asphalt.
6. The method for preparing the phenolic resin modified asphalt according to claim 5, which is characterized by comprising 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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| US6492439B2 (en) * | 2000-12-28 | 2002-12-10 | Firestone Polymers, Llc | Asphalt compositions |
| CN106751968A (en) * | 2016-12-16 | 2017-05-31 | 漳州新立基沥青有限公司 | A kind of high performance modified bitumen and preparation method thereof |
| CN107118512A (en) * | 2017-05-26 | 2017-09-01 | 江苏省江南新型复合研磨材料及制品工程技术研究中心有限公司 | A kind of phenol-formaldehyde resin modified having excellent storage stability and its preparation technology |
| CN108530924B (en) * | 2018-04-28 | 2021-01-15 | 广东诚泰投资集团有限公司 | Modified asphalt |
| CN113736272B (en) * | 2021-09-04 | 2023-05-02 | 佛山路桥工程技术咨询有限公司 | High-temperature-resistant road asphalt and preparation method thereof |
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