CN114605844B - Ultraviolet aging resistant desulfurization rubber powder modified asphalt and preparation method thereof - Google Patents
Ultraviolet aging resistant desulfurization rubber powder modified asphalt and preparation method thereof Download PDFInfo
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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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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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Abstract
The invention belongs to the technical field of highway building materials, and discloses ultraviolet aging resistant desulfurization rubber powder modified asphalt and a preparation method thereof. The ultraviolet aging resistant desulfurization rubber powder modified asphalt comprises the following components in parts by weight: 94-96 parts of TB rubber powder modified asphalt, 1.7-3.5 parts of ultraviolet light absorber, 0.2-0.4 part of stabilizer and 1.4-3.2 parts of anti-aging agent. The preparation method comprises the following steps: preheating TB rubber powder modified asphalt to 170-180 ℃, adding a stabilizer and an anti-aging agent, uniformly stirring and mixing, and then adding an ultraviolet light absorbent, and uniformly stirring and mixing to obtain the ultraviolet aging resistant desulfurization rubber powder modified asphalt. The modified asphalt of the invention can effectively improve ultraviolet aging resistance, recycle waste rubber resources, solve the problem of black pollution of waste tires, improve pavement quality of roads and prolong service life, and the preparation method is simple and convenient to operate and saves cost.
Description
Technical Field
The invention belongs to the technical field of highway building materials, and particularly relates to ultraviolet aging resistant desulfurization rubber powder modified asphalt and a preparation method thereof.
Background
The excellent performance of the common rubber powder modified asphalt has been proved in a large number of engineering practices, but along with the sequential discharge of environmental protection, energy conservation and emission reduction policies in recent years, the traditional rubber asphalt production mode and the use effect also show obvious defects and defects, so that the requirements of the construction of the highway asphalt pavement under the current environmental protection situation can not be met gradually, and the further development of the road asphalt pavement is limited seriously. The main reason is that the rubber powder and the matrix asphalt have poor compatibility due to obvious differences of physical and chemical properties of the asphalt and the rubber powder, so that the common rubber asphalt has the defects of high viscosity, poor fluidity, poor dispersibility, difficult mixing of the mixture, difficult compaction of a road surface and the like, and the common rubber asphalt has the disadvantages of poor high-temperature storage stability due to easy layering segregation between rubber powder particles and the asphalt, and the common rubber asphalt is required to be processed and mixed on site and cannot be transported for a long distance in a finished product form, so that the defects severely limit the industrial process and the application range of the rubber asphalt. More importantly, the common rubber asphalt is found to generate a large amount of smoke dust and pungent smell in the production or construction stage in the current popularization process of the common rubber asphalt, so that the environment is polluted, and meanwhile, the health of construction staff is seriously endangered.
The asphalt in the desulfurization rubber powder modified asphalt and the desulfurization rubber powder can be subjected to chemical reaction, so that the viscosity of the asphalt is greatly reduced, the defect of the common rubber powder modified asphalt can be effectively overcome on the premise of ensuring the performance of the original common rubber asphalt, and the purposes of energy conservation and emission reduction are realized. The Terminal Blend rubber powder modified asphalt (hereinafter referred to as TB rubber powder modified asphalt) is representative of desulfurization rubber powder modified asphalt, the TB technology solves the cost and scale problems caused by rubber powder pre-desulfurization to a certain extent, and the asphalt has good high and low temperature performance after composite modification.
However, under the comprehensive influence of light, heat, oxygen and other environmental factors and loads, the asphalt in the service period can be irreversibly aged, the performance is gradually deteriorated, and finally the pavement performance of the asphalt mixture is reduced. Ultraviolet light is radiation with short wavelength and high energy existing in sunlight, the light energy of the ultraviolet light is close to the energy of main molecular bonds in asphalt, the molecular structure in asphalt can be destroyed, the asphalt components and the colloid structure are changed, and the aging of asphalt is accelerated. Thus, ultraviolet radiation is an important contributor to the photo-oxidative aging of asphalt. Along with the proposal of international long-life asphalt pavement concept, in order to ensure that the asphalt pavement has good long-term service performance, the improvement of the ultraviolet aging resistance of the desulfurization rubber powder modified asphalt is needed, which has extremely important significance for the construction and use of asphalt pavement in areas with strong ultraviolet radiation in China.
Patent CN 110698868A discloses a composite modified asphalt with excellent high-low temperature performance suitable for high altitude areas, which comprises the following components in parts by weight: 100 parts of matrix asphalt, 1-10 parts of infrared absorbent, 0.2-1 part of ultraviolet antioxidant and 5-14 parts of composite modifier, wherein the composite modifier is a mixture of SBR and TPS; the low-temperature performance of the asphalt is effectively improved by utilizing the extremely strong low-temperature flexibility of SBR under the comprehensive consideration of the mutual compatibility of all the modifiers, the production process and other factors, the high-temperature rutting resistance of the asphalt is improved by utilizing the excellent high-temperature stability of TPS, and the capability of resisting accelerated aging of the asphalt caused by sunlight irradiation in high-cold high-altitude areas is improved by utilizing the asphalt infrared absorber and the ultraviolet antioxidant. However, the composite modifier, the ultraviolet antioxidant and the like used in the patent have higher cost and limited ageing resistance.
Patent CN 112646382A discloses a composite modified asphalt, which comprises the following components in parts by weight: 72 to 84 parts of matrix asphalt, 15 to 25 parts of activated rubber powder, 0.5 to 2 parts of SBS, 0.1 to 0.8 part of stabilizer, 0.1 to 0.6 part of solubilizer and 0.1 to 0.6 part of anti-aging agent. According to the invention, the rubber powder is subjected to activation treatment, so that the surface roughness and activity of the rubber powder are improved, the compatibility of the rubber powder and asphalt is improved, and the viscosity of the rubber asphalt is reduced, so that the construction workability is improved. The patent also has the defects of higher raw material cost and limited ageing resistance.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the primary purpose of the invention is to provide ultraviolet aging resistant desulfurization rubber powder modified asphalt.
The invention also aims to provide a preparation method of the ultraviolet aging resistant desulfurization rubber powder modified asphalt.
The modified asphalt can effectively improve the ultraviolet light aging resistance of the asphalt, can recycle the waste rubber resources, solves the problem of black pollution of waste tires, improves the pavement quality of roads and prolongs the service life of the roads, and has the advantages of simple and convenient preparation method operation and cost saving.
The invention aims at realizing the following technical scheme:
the ultraviolet aging resistant desulfurization rubber powder modified asphalt comprises the following components in parts by weight: 94-96 parts of TB rubber powder modified asphalt, 1.7-3.5 parts of ultraviolet light absorber, 0.2-0.4 part of stabilizer and 1.4-3.2 parts of anti-aging agent.
Further, the TB rubber powder modified asphalt is prepared by mixing waste rubber powder and matrix asphalt with the mass ratio of 1 (4-6) at the temperature of 230-240 ℃.
Further preferably, the mass percentage of the carbon black in the waste rubber powder is 29-33%.
Further preferably, the matrix asphalt is a matrix asphalt having a penetration of 65 to 69dmm at 25 ℃. More preferably Egypt No. 70 asphalt.
Further, the ultraviolet light absorber is ultraviolet light absorber UV-326.
Further, the stabilizer is zinc acetylacetonate.
The invention adopts specific zinc acetylacetonate as a stabilizer, not only can promote the crosslinking reaction inside the polymer phase, but also can cause the crosslinking reaction between the polymer and the matrix asphalt to a certain extent, thereby playing a role in stabilizing the thermodynamic system of the modified asphalt.
Further, the anti-aging agent is composed of nano TiO 2 And nano montmorillonite with a mass ratio of 1:1-5.
Further preferably, the nano TiO 2 The mass of the medium anatase and the rutile is 1 (0.25-0.24).
Further preferably, the average particle diameter of the nano montmorillonite is 20-25 nm.
The preparation method of the ultraviolet aging resistant desulfurization rubber powder modified asphalt comprises the following steps: preheating TB rubber powder modified asphalt to 170-180 ℃, adding a stabilizer and an anti-aging agent, uniformly stirring and mixing, and then adding an ultraviolet light absorbent, and uniformly stirring and mixing to obtain the ultraviolet aging resistant desulfurization rubber powder modified asphalt.
Compared with the prior art, the invention has the beneficial effects that:
(1) The ultraviolet aging resistant desulfurization rubber powder modified asphalt is prepared by mixing TB rubber powder modified asphalt, an ultraviolet absorber, a stabilizer and an anti-aging agent according to a certain process, the ultraviolet aging resistant performance of the asphalt can be effectively improved through reasonable design of a preparation process, waste rubber resources are recycled, the problem of black pollution of waste tires is solved, the pavement quality of a road is improved, the service life of the road is prolonged, and the preparation method is simple and convenient to operate and saves cost.
(2) The ultraviolet aging resistant desulfurization rubber powder modified asphalt has good road use and aging resistance, can reduce maintenance and maintenance cost of asphalt pavement, prolongs service life of asphalt pavement, and has important significance for promoting sustainable and rapid development of highway construction.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
The ultraviolet aging resistant desulfurization rubber powder modified asphalt comprises the following components in parts by weight: 95 parts of TB rubber powder modified asphalt, 2.5 parts of ultraviolet light absorber, 0.2 part of stabilizer and 2.3 parts of anti-aging agent.
The TB rubber powder modified asphalt adopted in the embodiment is prepared by mixing waste rubber powder and matrix asphalt at 230 ℃, wherein the mass percentage of carbon black in the waste rubber powder is 30%, the matrix asphalt is Esso 70 # asphalt, the mass ratio of the waste rubber powder to the matrix asphalt is 1:4, and the mixing time is 6 hours.
The ultraviolet light absorber adopted in the embodiment is an ultraviolet light absorber UV-326; the stabilizer is zinc acetylacetonate; the anti-aging agent is prepared from nano TiO 2 (mass ratio of anatase to rutile is 1:0.25) and nano montmorillonite (average particle size is 20 nm) according to mass ratio of 1:5.
The ultraviolet aging resistant desulfurization rubber powder modified asphalt of the embodiment is prepared by the following method: preheating TB rubber powder modified asphalt to 170 ℃, adding an external stabilizer and an anti-aging agent, stirring for 1h by using an electric stirrer, adding an ultraviolet light absorber, and stirring for 0.5h to obtain the ultraviolet aging resistant desulfurization rubber powder modified asphalt.
Example 2
The ultraviolet aging resistant desulfurization rubber powder modified asphalt comprises the following components in parts by weight: 94 parts of TB rubber powder modified asphalt, 3.5 parts of ultraviolet light absorber, 0.4 part of stabilizer and 2.1 parts of anti-aging agent.
The TB rubber powder modified asphalt adopted in the embodiment is prepared by mixing waste rubber powder and matrix asphalt at 235 ℃, wherein the mass percentage of carbon black in the waste rubber powder is 29%, the matrix asphalt is Esso 70 # asphalt, the mass ratio of the waste rubber powder to the matrix asphalt is 1:5, and the mixing time is 5h.
The ultraviolet light absorber adopted in the embodiment is an ultraviolet light absorber UV-326; the stabilizer is zinc acetylacetonate; the anti-aging agent is prepared from nano TiO 2 (mass ratio of anatase to rutile is 1:0.25) and nano montmorillonite (average particle size is 25 nm) according to mass ratio of 1:3.
The ultraviolet aging resistant desulfurization rubber powder modified asphalt of the embodiment is prepared by the following method: preheating TB rubber powder modified asphalt to 175 ℃, adding an external stabilizer and an anti-aging agent, stirring for 1.2 hours by using an electric stirrer, adding an ultraviolet light absorber, and stirring for 0.5 hour to obtain the ultraviolet aging resistant desulfurization rubber powder modified asphalt.
Example 3
The ultraviolet aging resistant desulfurization rubber powder modified asphalt comprises the following components in parts by weight: 96 parts of TB rubber powder modified asphalt, 2 parts of ultraviolet light absorber, 0.3 part of stabilizer and 1.7 parts of anti-aging agent.
The TB rubber powder modified asphalt adopted in the embodiment is prepared by mixing waste rubber powder and matrix asphalt at 240 ℃, wherein the mass percentage of carbon black in the waste rubber powder is 33%, the matrix asphalt is Esso 70 # asphalt, the mass ratio of the waste rubber powder to the matrix asphalt is 1:6, and the mixing time is 4 hours.
This practice isThe ultraviolet light absorber used in the examples is ultraviolet light absorber UV-326; the stabilizer is zinc acetylacetonate; the anti-aging agent is prepared from nano TiO 2 (mass ratio of anatase to rutile is 1:0.24) and nano montmorillonite (average particle size is 25 nm) according to mass ratio of 1:4.
The ultraviolet aging resistant desulfurization rubber powder modified asphalt of the embodiment is prepared by the following method: preheating TB rubber powder modified asphalt to 180 ℃, adding an external stabilizer and an anti-aging agent, stirring for 1h by using an electric stirrer, adding an ultraviolet light absorber, and stirring for 0.5h to obtain the ultraviolet aging resistant desulfurization rubber powder modified asphalt.
Comparative example 1
The comparative example is that the prior desulfurization rubber powder modified asphalt consists of the following components in parts by weight: 85 parts of matrix asphalt, 13 parts of desulfurization rubber powder and 2 parts of stabilizer ethylene propylene diene monomer rubber.
The desulfurization rubber powder modified asphalt of the comparative example is prepared by the following method: preheating matrix asphalt to 180 ℃, adding desulfurization rubber powder and a stabilizer ethylene propylene diene monomer rubber, and stirring for 1.5h by using an electric stirrer to obtain the desulfurization rubber powder modified asphalt.
Comparative example 2
In this comparative example, the stabilizer was zinc acetylacetonate was not added as in example 1, and the remainder was the same.
Comparative example 3
In this comparative example, compared with example 1, no anti-aging agent nano TiO was added 2 And nano montmorillonite, the rest are the same.
Comparative tests were conducted on the modified asphalt obtained in examples 1 to 3 and comparative examples 1 to 3 above, and the results are shown in Table 1 below:
TABLE 1
| Index (I) | Comparative example 1 | Comparative example 2 | Comparative example 3 | Example 1 | Example 2 | Example 3 |
| Complex modulus aging index at 60 DEG C | 3.0 | 2.7 | 2.5 | 2.4 | 2.2 | 1.8 |
| Rutting factor aging index at 60 DEG C | 2.5 | 2.4 | 2.3 | 2.1 | 1.9 | 1.5 |
| 60 ℃ phase angle aging index | 0.62 | 0.65 | 0.70 | 0.73 | 0.82 | 0.85 |
Complex modulus oldThe smaller the ageing index of the change and rutting factor indicates a smaller degree of asphalt ageing, and the opposite is true for the phase angle ageing index law. From the detection results, the invention uses TB rubber powder modified asphalt, ultraviolet light absorber, specific stabilizer zinc acetylacetonate and anti-aging agent nano TiO 2 And the synergistic effect of the nano montmorillonite, the complex modulus aging index at 60 ℃ and the rutting factor aging index at 60 ℃ of the prepared ultraviolet aging resistant desulfurization rubber powder modified asphalt are obviously reduced, the phase angle aging index at 60 ℃ is improved, and the ultraviolet aging resistant performance of the rubber powder modified asphalt is effectively improved.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (7)
1. The ultraviolet aging resistant desulfurization rubber powder modified asphalt is characterized by comprising the following components in parts by weight: 94-96 parts of TB rubber powder modified asphalt, 1.7-3.5 parts of ultraviolet light absorber, 0.2-0.4 part of stabilizer and 1.4-3.2 parts of anti-aging agent;
the TB rubber powder modified asphalt is prepared by mixing waste rubber powder and matrix asphalt with the mass ratio of 1 (4-6) at the temperature of 230-240 ℃;
the stabilizer is zinc acetylacetonate; the anti-aging agent is prepared from nano TiO 2 And nano montmorillonite with a mass ratio of 1:1-5.
2. The ultraviolet aging resistant desulfurization rubber powder modified asphalt according to claim 1, wherein the mass percentage of carbon black in the waste rubber powder is 29% -33%.
3. The ultraviolet aging resistant desulfurization rubber powder modified asphalt according to claim 1, wherein the matrix asphalt is a matrix asphalt with a penetration of 65-69 dmm at 25 ℃.
4. The ultraviolet light aging resistant desulfurization rubber powder modified asphalt according to claim 1, wherein the ultraviolet light absorber is ultraviolet light absorber UV-326.
5. The ultraviolet light aging resistant desulfurization rubber powder modified asphalt according to claim 1, wherein the nano-TiO 2 The mass of the medium anatase and the rutile is 1 (0.25-0.24).
6. The ultraviolet aging resistant desulfurization rubber powder modified asphalt according to claim 1, wherein the average particle size of the nano montmorillonite is 20-25 nm.
7. The method for preparing the ultraviolet light aging resistant desulfurization rubber powder modified asphalt according to any one of claims 1-6, which is characterized by comprising the following steps: preheating TB rubber powder modified asphalt to 170-180 ℃, adding a stabilizer and an anti-aging agent, stirring and mixing uniformly, and then adding an ultraviolet light absorbent, stirring and mixing uniformly to obtain the ultraviolet aging resistant desulfurization rubber powder modified asphalt.
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