CN115678299A - Rubber powder modified asphalt and preparation method thereof - Google Patents
Rubber powder modified asphalt and preparation method thereof Download PDFInfo
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- CN115678299A CN115678299A CN202211365761.8A CN202211365761A CN115678299A CN 115678299 A CN115678299 A CN 115678299A CN 202211365761 A CN202211365761 A CN 202211365761A CN 115678299 A CN115678299 A CN 115678299A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The invention discloses rubber powder modified asphalt and a preparation method thereof, wherein hydrogen peroxide is adopted to carry out oxidation pretreatment on rubber powder, so that the number of active groups of the rubber powder is increased, the surface roughness of the rubber powder is increased, the subsequent reaction is convenient to carry out, then silane coupling agent tridecafluorooctyltriethoxysilane is used to modify the rubber powder, the modified rubber powder reacts with the active groups in the asphalt, the modified rubber powder and the asphalt form two phases which are mutually crosslinked, and the high-temperature storage stability of the asphalt is obviously improved; and reacting alkali lignin with carbon disulfide in an alkaline environment to obtain modified lignin, and applying the modified lignin to asphalt to promote vulcanization of an interface between the modified rubber powder and the asphalt, wherein phenolic hydroxyl groups which do not participate in reaction in the alkali lignin, the modified rubber powder and active groups in the asphalt form a cross-linked network structure, so that the high-temperature deformation resistance of the asphalt is further enhanced, and the stability of a modified asphalt product is improved.
Description
Technical Field
The invention relates to the technical field of asphalt material processing, in particular to rubber powder modified asphalt and a preparation method thereof.
Background
At present, with the development of the automobile industry, the yield of waste tires is greatly increased, a large amount of waste tires are difficult to degrade and contain harmful substances, the solid waste can form serious black pollution, and the environmental protection pressure is higher and higher, so that the recycling of waste rubber is increasingly concerned by people, and as research and development are deeply carried out, technicians are increasingly a research hotspot for preparing the waste tires into rubber powder to modify asphalt.
However, because the flowability of the rubber powder and the asphalt material is poor, the viscosity of a modified asphalt synthesis system is high in the process of producing the modified asphalt, the rubber powder is not easily dispersed in the asphalt, the intersolubility between the rubber powder and the asphalt is poor, the phenomenon of poor adhesion between the rubber powder and the asphalt is easily caused, and the quality of a modified asphalt product is affected; at present, the surface of the particles is activated or polarized by adopting a physical and chemical method to carry out surface modification treatment on rubber powder, so that the adsorption effect between the rubber powder and an asphalt component is enhanced, the interface bonding force between the rubber powder and the asphalt component is improved, and further the compatibility between the rubber powder and the asphalt is improved, chinese patent document CN201711499037.3 discloses rubber powder modified asphalt and a preparation method thereof, the common asphalt is modified by adopting waste tire rubber powder, the asphalt quality and the pavement service performance can be effectively improved, the pavement service life is prolonged, 13% of material cost can be saved by adopting the rubber powder modified asphalt to replace SBS modified asphalt, but the compatibility between the rubber powder and the asphalt still needs to be improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide rubber powder modified asphalt and a preparation method thereof, and solves the technical problem of unstable product performance caused by poor compatibility between rubber powder and asphalt in the traditional process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the preparation method of the rubber powder modified asphalt comprises the following steps:
(1) Adding rubber powder into hydrogen peroxide, heating and stirring for reaction, and after the reaction is finished, filtering, washing and drying a reaction product to obtain pretreated rubber powder;
(2) Dispersing the pre-treated rubber powder in deionized water, adding tridecafluorooctyltriethoxysilane, stirring for reaction, and after the reaction is finished, filtering, washing and drying a reaction product to obtain modified rubber powder;
(3) Dissolving alkali lignin in deionized water, adjusting the pH value of the solution to 10-12, adding carbon disulfide for reaction, and after the reaction is finished, centrifuging, washing, and freeze-drying to obtain modified lignin;
(4) Adding asphalt into a premixing tank, stirring and heating to 170-180 ℃, keeping the temperature unchanged, adding modified rubber powder, stirring and mixing uniformly, adding coal tar, continuously stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining at 180-200 ℃ for 20-30min, adding modified lignin, firstly shearing at a shearing rate of 1000-1500r/min for 10-20min, then shearing at a shearing rate of 3000-4000r/min for 30-60min, and after the shearing is finished, obtaining the rubber powder modified asphalt.
Preferably, in the step (1), the mass ratio of the rubber powder to the hydrogen peroxide is 20-30 percent.
Preferably, in the step (1), the temperature for heating and stirring reaction is 60-80 ℃, and the time for heating and stirring reaction is 2-3h.
Preferably, in the step (2), the mass ratio of the pretreatment rubber powder, the deionized water and the tridecafluorooctyltriethoxysilane is 10-20.
Preferably, in the step (2), the stirring reaction temperature is 40-60 ℃, and the stirring reaction time is 3-5h.
Preferably, in the step (3), the mass ratio of the alkali lignin to the carbon disulfide is 10-15.
Preferably, in the step (3), the reaction temperature is 30-40 ℃ and the reaction time is 3-4h.
Preferably, in the step (4), the mass ratio of the asphalt, the modified rubber powder, the coal tar and the modified lignin is (100).
The invention also provides the rubber powder modified asphalt prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, hydrogen peroxide is adopted to carry out oxidation pretreatment on the rubber powder, so that the number of active groups of the rubber powder is increased, meanwhile, the surface roughness of the rubber powder is increased, and the subsequent reaction is facilitated; meanwhile, the tridecafluorooctyltriethoxysilane has good permeability, so that the modified rubber powder and the asphalt have better compatibility, the swelling is more sufficient, and the modified asphalt system is more stable.
(2) The invention utilizes alkali lignin and carbon disulfide to react in an alkaline environment to obtain modified lignin, and then the modified lignin is applied to asphalt, so that the vulcanization of the interface between the modified rubber powder and the asphalt can be promoted, the vulcanization time is shortened, and the vulcanization efficiency is improved.
Detailed Description
The present invention will be described in more detail with reference to specific preferred embodiments, but the present invention is not limited to the following embodiments.
It should be noted that the chemicals involved in the present invention are all purchased from commercial sources without specific reference.
The rubber powder used in the invention is purchased from Hebei Hemiguang mineral products, inc., and the granularity is 20-80 meshes;
tridecafluorooctyltriethoxysilane was purchased from Jiangsu plerian biotechnology, inc., CAS:51851-37-7;
the alkali lignin is purchased from Ailiwan chemical science and technology Limited, shandong, and has the following model: ALW001;
the asphalt is medium-temperature coal asphalt which is purchased from Heizhihao rubber chemical industry Co., ltd;
coal tar is purchased from Hengshuihuaiaohao rubber chemical Co.
Example 1
The preparation method of the rubber powder modified asphalt comprises the following steps:
(1) Adding 2kg of rubber powder into 10kg of 20wt% hydrogen peroxide, heating and stirring at 60 ℃ for reacting for 2 hours, and after the reaction is finished, filtering, washing and drying a reaction product to obtain pre-treated rubber powder;
(2) Dispersing 1kg of the pre-treated rubber powder in 10kg of deionized water, then adding 0.2kg of tridecafluorooctyltriethoxysilane, stirring and reacting for 3 hours at 40 ℃, and after the reaction is finished, filtering, washing and drying a reaction product to obtain modified rubber powder;
(3) Dissolving 100g of alkali lignin in 1500g of deionized water, adjusting the pH value of the solution to 10, then adding 20g of carbon disulfide, stirring and reacting for 3 hours at 30 ℃, and after the reaction is finished, centrifuging, washing, and freeze-drying to obtain modified lignin;
(4) Adding 10kg of asphalt into a premixing tank, stirring and heating to 170 ℃, keeping the temperature unchanged, adding 2.5kg of modified rubber powder, stirring and mixing uniformly, adding 0.2kg of coal tar, continuing stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining for 20min at 180 ℃, adding 0.8kg of modified lignin, firstly shearing for 10min at a shearing rate of 1000r/min, then shearing for 30min at a shearing rate of 3000r/min, and obtaining the rubber powder modified asphalt after the shearing is finished.
Example 2
The preparation method of the rubber powder modified asphalt comprises the following steps:
(1) Adding 2kg of rubber powder into 10kg of 30wt% hydrogen peroxide, heating and stirring at 80 ℃ for reaction for 3 hours, and after the reaction is finished, filtering, washing and drying a reaction product to obtain pre-treated rubber powder;
(2) Dispersing 2kg of pre-treated rubber powder in 10kg of deionized water, then adding 0.4kg of tridecafluorooctyltriethoxysilane, stirring and reacting for 5 hours at the temperature of 60 ℃, and after the reaction is finished, filtering, washing and drying a reaction product to obtain modified rubber powder;
(3) Dissolving 150g of alkali lignin in 1500g of deionized water, adjusting the pH value of the solution to 12, then adding 40g of carbon disulfide, stirring and reacting for 4 hours at 40 ℃, and after the reaction is finished, centrifuging, washing and freeze-drying to obtain modified lignin;
(4) Adding 10kg of asphalt into a premixing tank, stirring and heating to 180 ℃, keeping the temperature unchanged, adding 3.0kg of modified rubber powder, stirring and mixing uniformly, adding 0.4kg of coal tar, continuing stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining for 30min at 200 ℃, adjusting the temperature to 175 ℃, adding 0.8kg of modified lignin, firstly shearing for 10min at a shearing rate of 1500r/min, then shearing for 30min at a shearing rate of 4000r/min, and obtaining the rubber powder modified asphalt after the shearing is finished.
Example 3
The preparation method of the rubber powder modified asphalt comprises the following steps:
(1) Adding 3kg of rubber powder into 10kg of 25wt% hydrogen peroxide, heating and stirring at 70 ℃ for reacting for 2 hours, and after the reaction is finished, filtering, washing and drying a reaction product to obtain pre-treated rubber powder;
(2) Dispersing 2kg of pre-treated rubber powder in 10kg of deionized water, then adding 0.3kg of tridecafluorooctyltriethoxysilane, stirring and reacting for 4 hours at 50 ℃, and after the reaction is finished, filtering, washing and drying a reaction product to obtain modified rubber powder;
(3) Dissolving 120g of alkali lignin in 1500g of deionized water, adjusting the pH value of the solution to be 12, then adding 30g of carbon disulfide, stirring and reacting for 3 hours at 35 ℃, and after the reaction is finished, centrifuging, washing, and freeze-drying to obtain modified lignin;
(4) Adding 10kg of asphalt into a premixing tank, stirring and heating to 175 ℃, keeping the temperature unchanged, adding 2.6kg of modified rubber powder, stirring and mixing uniformly, adding 0.3kg of coal tar, continuing stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining for 30min at 200 ℃, adjusting the temperature to 175 ℃, adding 1.2kg of modified lignin, firstly shearing for 20min at a shearing rate of 1200r/min, then shearing for 60min at a shearing rate of 3000r/min, and obtaining the rubber powder modified asphalt after the shearing is finished.
Example 4
The preparation method of the rubber powder modified asphalt comprises the following steps:
(1) Adding 2.5kg of rubber powder into 10kg of 20wt% hydrogen peroxide, heating and stirring at 80 ℃, reacting for 2 hours, and after the reaction is finished, filtering, washing and drying a reaction product to obtain pre-treated rubber powder;
(2) Dispersing 1.5kg of pre-treated rubber powder in 10kg of deionized water, then adding 0.4kg of tridecafluorooctyltriethoxysilane, stirring and reacting for 3 hours at the temperature of 60 ℃, and after the reaction is finished, filtering, washing and drying a reaction product to obtain modified rubber powder;
(3) Dissolving 120g of alkali lignin in 1500g of deionized water, adjusting the pH value of the solution to 12, then adding 40g of carbon disulfide, stirring and reacting for 4 hours at 40 ℃, and after the reaction is finished, centrifuging, washing and freeze-drying to obtain modified lignin;
(4) Adding 10kg of asphalt into a premixing tank, stirring and heating to 175 ℃, keeping the temperature unchanged, adding 2.8kg of modified rubber powder, stirring and mixing uniformly, adding 0.4kg of coal tar, continuing stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining for 30min at 200 ℃, adjusting the temperature to 175 ℃, adding 1.0kg of modified lignin, firstly shearing for 20min at a shearing rate of 1000r/min, then shearing for 60min at a shearing rate of 3000r/min, and obtaining the rubber powder modified asphalt after the shearing is finished.
Comparative example 1
The preparation method of the rubber powder modified asphalt comprises the following steps:
adding 10kg of asphalt into a premixing tank, stirring and heating to 175 ℃, keeping the temperature unchanged, adding 2.6kg of rubber powder, stirring and mixing uniformly, adding 0.3kg of coal tar, continuing stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining for 30min at 200 ℃, adjusting the temperature to 175 ℃, adding 1.2kg of alkali lignin, firstly shearing for 20min at a shearing rate of 1200r/min, then shearing for 60min at a shearing rate of 3000r/min, and obtaining the rubber powder modified asphalt after the shearing is finished.
Comparative example 2
The preparation method of the rubber powder modified asphalt comprises the following steps:
(1) Adding 3kg of rubber powder into 10kg of 25wt% hydrogen peroxide, heating and stirring at 70 ℃ for reacting for 2 hours, and after the reaction is finished, filtering, washing and drying a reaction product to obtain pre-treated rubber powder;
(2) Dispersing 2kg of the pre-treated rubber powder in 10kg of deionized water, then adding 0.3kg of tridecafluorooctyltriethoxysilane, stirring and reacting for 4 hours at 50 ℃, and after the reaction is finished, filtering, washing and drying a reaction product to obtain modified rubber powder;
(3) Adding 10kg of asphalt into a premixing tank, stirring and heating to 175 ℃, keeping the temperature unchanged, adding 2.6kg of modified rubber powder, stirring and mixing uniformly, adding 0.3kg of coal tar, continuing stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining for 30min at 200 ℃, adjusting the temperature to 175 ℃, firstly shearing for 20min at a shearing rate of 1200r/min, then shearing for 60min at a shearing rate of 3000r/min, and obtaining the rubber powder modified asphalt after the shearing is finished.
Comparative example 3
The preparation method of the rubber powder modified asphalt comprises the following steps:
(1) Adding 3kg of rubber powder into 10kg of 25wt% hydrogen peroxide, heating and stirring at 70 ℃ for reacting for 2 hours, and after the reaction is finished, filtering, washing and drying a reaction product to obtain pre-treated rubber powder;
(2) Dissolving 120g of alkali lignin in 1500g of deionized water, adjusting the pH value of the solution to be 12, then adding 30g of carbon disulfide, stirring and reacting for 3 hours at 35 ℃, and after the reaction is finished, centrifuging, washing, and freeze-drying to obtain modified lignin;
(3) Adding 10kg of asphalt into a premixing tank, stirring and heating to 175 ℃, keeping the temperature unchanged, adding 2.6kg of pre-treated rubber powder, stirring and mixing uniformly, adding 0.3kg of coal tar, continuing stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining at 200 ℃ for 30min, adjusting the temperature to 175 ℃, adding 1.2kg of modified lignin, firstly shearing at the shearing rate of 1200r/min for 20min, then shearing at the shearing rate of 3000r/min for 60min, and obtaining the rubber powder modified asphalt after the shearing is finished.
The modified asphalt samples prepared in examples 1 to 4 and comparative examples 1 to 3 were subjected to the following property tests:
ductility test experiment: the testing method refers to an asphalt ductility testing method disclosed in GB/T4508-2010, the testing temperature is 5 ℃, the stretching speed is 5cm/min, the testing is carried out for 3 times, and the results are averaged;
softening point test: performing an asphalt softening point test (ring and ball method) according to a standard T0606-2011 for 3 times, and averaging results;
segregation softening point difference test experiment: the test method refers to a polymer modified asphalt segregation test method disclosed in SH/T0740-2003, tests for 48 hours at 163 ℃, determines the softening point and calculates the softening point difference, tests for 3 times, and averages the results;
the test results are shown in the following table:
| 5 ℃ ductility (cm) | Softening Point temperature (. Degree. C.) | Segregation softening point Difference (. Degree. C.) | |
| Example 1 | 30.2 | 84.8 | 0.64 |
| Example 2 | 30.6 | 85.5 | 0.59 |
| Example 3 | 30.4 | 85.1 | 0.63 |
| Example 4 | 30.3 | 84.9 | 0.62 |
| Comparative example 1 | 19.1 | 72.4 | 4.85 |
| Comparative example 2 | 22.7 | 73.6 | 2.68 |
| Comparative example 3 | 24.5 | 78.3 | 1.37 |
Finally, it is to be noted that: the above examples do not limit the invention in any way. It will be apparent to those skilled in the art that various modifications and improvements can be made to the invention. Accordingly, any modification or improvement made without departing from the spirit of the present invention is within the scope of the claimed invention.
Claims (9)
1. The preparation method of the rubber powder modified asphalt is characterized by comprising the following steps:
(1) Adding rubber powder into hydrogen peroxide, heating and stirring for reaction, and after the reaction is finished, filtering, washing and drying a reaction product to obtain pretreated rubber powder;
(2) Dispersing the pre-treated rubber powder in deionized water, adding tridecafluorooctyltriethoxysilane, stirring for reaction, and after the reaction is finished, filtering, washing and drying a reaction product to obtain modified rubber powder;
(3) Dissolving alkali lignin in deionized water, adjusting the pH value of the solution to 10-12, adding carbon disulfide for reaction, and after the reaction is finished, centrifuging, washing, and freeze-drying to obtain modified lignin;
(4) Adding asphalt into a premixing tank, stirring and heating to 170-180 ℃, keeping the temperature unchanged, adding modified rubber powder, stirring and mixing uniformly, adding coal tar, continuously stirring and mixing uniformly to obtain a premix, then adding the premix into a preparation tank, uniformly refining at 180-200 ℃ for 20-30min, adding modified lignin, firstly shearing at a shearing rate of 1000-1500r/min for 10-20min, then shearing at a shearing rate of 3000-4000r/min for 30-60min, and after the shearing is finished, obtaining the rubber powder modified asphalt.
2. The preparation method according to claim 1, wherein in the step (1), the mass ratio of the rubber powder to the hydrogen peroxide is 20-30% to 100, wherein the mass fraction of the hydrogen peroxide is 20-30%.
3. The preparation method according to claim 1, wherein in the step (1), the temperature for the heating and stirring reaction is 60 to 80 ℃ and the time for the heating and stirring reaction is 2 to 3 hours.
4. The preparation method according to claim 1, wherein in the step (2), the mass ratio of the pre-treatment rubber powder, the deionized water and the tridecafluorooctyltriethoxysilane is 10-20.
5. The preparation method according to claim 1, wherein in the step (2), the temperature of the stirring reaction is 40 to 60 ℃ and the time of the stirring reaction is 3 to 5 hours.
6. The preparation method according to claim 1, wherein in the step (3), the mass ratio of the alkali lignin to the carbon disulfide is 10-15.
7. The method according to claim 1, wherein in the step (3), the reaction temperature is 30 to 40 ℃ and the reaction time is 3 to 4 hours.
8. The preparation method according to claim 1, wherein in the step (4), the mass ratio of the asphalt, the modified rubber powder, the coal tar and the modified lignin is (100).
9. The crumb modified asphalt prepared by the method as claimed in any one of claims 1 to 8.
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| US5704971A (en) * | 1997-03-04 | 1998-01-06 | Memon; Mohammed | Homogeneous crumb rubber modified asphalt |
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| CN103205131A (en) * | 2013-04-24 | 2013-07-17 | 广西交通科学研究院 | Chemical modified rubber asphalt with stable performance and preparation method thereof |
| CN106189299A (en) * | 2016-08-25 | 2016-12-07 | 仇颖超 | A kind of preparation method of appts of modified asphalt by utilizing waste tyre rubber powder |
| CN106861645A (en) * | 2017-03-14 | 2017-06-20 | 南京林业大学 | A kind of preparation method of the thio strong oil absorption material of aminated lignin base |
| CN107201047A (en) * | 2017-06-06 | 2017-09-26 | 安徽圣源橡塑科技有限公司 | A kind of activated waste rubber powder modified asphalt material |
| CN112724692A (en) * | 2020-12-17 | 2021-04-30 | 华运通达(广东)道路科技有限公司 | Modified asphalt using lignin and preparation method thereof |
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2022
- 2022-10-31 CN CN202211365761.8A patent/CN115678299B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5704971A (en) * | 1997-03-04 | 1998-01-06 | Memon; Mohammed | Homogeneous crumb rubber modified asphalt |
| CN101580639A (en) * | 2008-05-14 | 2009-11-18 | 中国石油化工股份有限公司 | Lignin modified asphalt composition and preparation method thereof |
| CN103205131A (en) * | 2013-04-24 | 2013-07-17 | 广西交通科学研究院 | Chemical modified rubber asphalt with stable performance and preparation method thereof |
| CN106189299A (en) * | 2016-08-25 | 2016-12-07 | 仇颖超 | A kind of preparation method of appts of modified asphalt by utilizing waste tyre rubber powder |
| CN106861645A (en) * | 2017-03-14 | 2017-06-20 | 南京林业大学 | A kind of preparation method of the thio strong oil absorption material of aminated lignin base |
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