CN111518400B - SBS/rubber powder composite modified asphalt based on Xinjiang asphalt and preparation method thereof - Google Patents
SBS/rubber powder composite modified asphalt based on Xinjiang asphalt and preparation method thereof Download PDFInfo
- Publication number
- CN111518400B CN111518400B CN202010327928.6A CN202010327928A CN111518400B CN 111518400 B CN111518400 B CN 111518400B CN 202010327928 A CN202010327928 A CN 202010327928A CN 111518400 B CN111518400 B CN 111518400B
- Authority
- CN
- China
- Prior art keywords
- asphalt
- sbs
- xinjiang
- parts
- rubber powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
-
- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a Sinkiang asphalt-based SBS/rubber powder composite modified asphalt and a preparation method thereof, wherein the Sinkiang asphalt is prepared from the following raw materials in parts by weight: the Xinjiang blend asphalt comprises 100 parts of powder, 2-4 parts of SBS, 10-20 parts of rubber powder, 1.5-3.5 parts of compatilizer, 2-4 parts of plasticizer, 1-2 parts of reinforcing agent, 0.5-1 part of coupling agent and 0.2 part of stabilizer. The preparation method specifically comprises the following steps: step one, SBS pretreatment; step two, mixing Xinjiang asphalt; step three, modifying and developing asphalt; and step four, re-developing the asphalt. The invention effectively solves the problems of poor compatibility and difficult modification of local Xinjiang asphalt (Claritian asphalt, tower asphalt and the like) and modifiers such as rubber powder, SBS and the like by means of asphalt blending, addition of various additives and the like, can promote the application of the local Xinjiang asphalt and reduce the construction cost of highway engineering.
Description
Technical Field
The invention belongs to the field of road building materials, relates to modified asphalt, and particularly relates to SBS/rubber powder composite modified asphalt based on Xinjiang asphalt and a preparation method thereof.
Background
The Xinjiang Uygur autonomous region has become one of the construction test points of the national traffic strong countries, and the further development of traffic engineering has been proposed. When highway engineering in Xinjiang area is built, SBS modified asphalt is mainly used as a bonding material, but local Clarityl asphalt (KLMY) and Tahe asphalt (TH) in Xinjiang have the problem of difficult modification. The KLMY component is characterized by low aromatic component, low asphaltene and high colloid, while the TH component is characterized by high asphaltene and low colloid, the solubility difference between the KLMY component and the modifier is large, the KLMY component and the modifier are directly modified with SBS, the KLMY component is poor in effect and not easy to store, the high-temperature performance index is not obviously improved, inland asphalt is generally adopted for modification application, the distance is long, the manufacturing cost is high, and cost control is not facilitated. Except SBS modification, the Xinjiang area also adopts rubber powder as a modifier to perform asphalt modification attempts, but the tendency that KLMY rubber powder modified asphalt is seriously separated and the low-temperature performance of TH rubber powder modified asphalt is not obviously improved is also shown, and the problem of local asphalt modification in Xinjiang becomes a problem which needs to be solved urgently in the development of current traffic transportation engineering.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention aims to provide the SBS/rubber powder composite modified asphalt based on the Xinjiang asphalt and the preparation method thereof, and overcomes the defects of poor storage stability, insufficient high and low temperature performance and the like of the Xinjiang asphalt in the prior art after modification.
In order to solve the technical problems, the invention adopts the following technical scheme:
the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt is prepared from the following raw materials in parts by weight: the Xinjiang blend asphalt comprises 100 parts of powder, 2-4 parts of SBS, 10-20 parts of rubber powder, 1.5-3.5 parts of compatilizer, 2-4 parts of plasticizer, 1-2 parts of reinforcing agent, 0.5-1 part of coupling agent and 0.2 part of stabilizer.
The invention also has the following technical characteristics:
the reinforcing agent is tetrapod-like zinc oxide whisker.
The Xinjiang blend asphalt is prepared from Clarity 90# asphalt and Tahe 60# asphalt in a weight ratio of (45-60): (40-55) and blending.
The SBS is a linear styrene-butadiene-styrene triblock copolymer, and the block ratio of styrene to butadiene is 30: 70.
the plasticizer is prepared from dioctyl phthalate and epoxy fatty acid isooctyl ester according to a weight ratio of 60:40 are compounded.
The blending process of the plasticizer is that the raw materials are mixed according to a proportion and then stirred for 20min at the temperature of 40-50 ℃.
The invention also discloses a preparation method of the SBS/rubber powder composite modified asphalt based on the Xinjiang asphalt, which adopts the formula of the SBS/rubber powder composite modified asphalt based on the Xinjiang asphalt.
The method specifically comprises the following steps:
step one, SBS pretreatment:
weighing SBS and compatilizer, respectively preheating SBS and compatilizer to 50 ℃, uniformly spraying the compatilizer on the surface of SBS, and keeping the temperature for standing for later use;
step two, mixing Xinjiang asphalt:
respectively heating the Clarity 90# asphalt and the Tahe 60# asphalt at 135 ℃ until the asphalt flows, taking out the asphalt, mixing while heating until the temperature is 150 +/-5 ℃, then stirring for 60min at 1000-1500 r/min, and standing for 30min for defoaming to obtain the Xinjiang blend asphalt.
Step three, asphalt modification and development:
heating the Xinjiang blend asphalt to 150 +/-5 ℃, then sequentially adding rubber powder and SBS pretreated by the compatilizer under the condition of stirring, and heating to 170 ℃ while stirring;
stirring for 10min until the modifier is blended into the asphalt, shearing and grinding with a high-speed shearing emulsifying machine or a colloid mill at a low speed of 1000r/min for 10min until the asphalt has no obvious granular sensation, rapidly heating the asphalt to 185 ℃, and shearing at 4500r/min for 15 min;
then adding a plasticizer, keeping the temperature at 160-170 ℃, stirring at a low speed of 500r/min for development for 30min, and fully swelling and developing the modifier;
heating the developed asphalt to 185 ℃, simultaneously adding a reinforcing agent and a coupling agent, shearing at 4500r/min for 25min, adding a stabilizing agent, and continuing to shear for 5min to obtain composite asphalt;
step four, asphalt re-development:
and putting the sheared composite modified asphalt in an oven at 150-160 ℃ for swelling development again for 1-1.5 h to obtain the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt.
Compared with the prior art, the invention has the following technical effects:
the invention (I) effectively solves the problems of poor compatibility and difficult modification of Xinjiang local asphalt (Claritian asphalt, tarnished asphalt and the like) and modifiers such as rubber powder, SBS and the like by means of asphalt blending, addition of various additives and the like, can promote the application of the Xinjiang local asphalt and reduce the construction cost of highway engineering.
Compared with the Xinjiang modified asphalt prepared by a single modifier, the SBS/rubber powder composite modified Xinjiang asphalt has the advantages of higher softening point, excellent low-temperature performance, stable thermal storage and the like, is energy-saving and environment-friendly, has excellent product performance, and can be widely used for functional layers of pavements and roads.
Aiming at the problem that the Sinkiang matrix asphalt has poor high and low temperature performance and poor storage stability after modification, the invention prepares the plasticizer suitable for the Sinkiang SBS/rubber powder composite modified asphalt by combining the advantages of various plasticizers, the epoxy functional group of the plasticizer can promote the combination between SBS and rubber powder, the kinematic viscosity is higher, and the influence of the epoxy functional group on the high temperature performance can be reduced while the low temperature performance of the asphalt is improved.
The tetrapod-like zinc oxide whiskers are directly added into the asphalt as an auxiliary agent, a framework supporting effect is achieved on the dispersed modifier in the blended asphalt, meanwhile, the viscosity of the reinforced modified asphalt is reduced after the plasticizer and the compatilizer are added, and the high-temperature performance and the storage stability of the product are guaranteed.
Compared with the method that single aromatic oil is used as a softening component and directly doped into the asphalt, the method that the aromatic oil is used as a pretreatment agent and is cooperated with a plasticizer can promote the swelling and dispersion of SBS, and effectively improve the low temperature and storage stability of the composite modified asphalt.
The present invention will be explained in further detail with reference to examples.
Detailed Description
As the Xinjiang asphalt has certain defects in SBS and rubber powder modification, the two modifiers are combined to modify the asphalt simultaneously. Domestic and foreign researches show that the high-low temperature performance of the SBS/rubber powder composite modified asphalt is improved compared with that of SBS modified asphalt, the storage stability of the SBS/rubber powder composite modified asphalt is improved compared with that of the conventional rubber asphalt, and the two modifiers can realize advantage complementation. Therefore, aiming at the particularity of the Xinjiang asphalt, the large-temperature-difference climate characteristic of the Xinjiang area is considered, the SBS and the rubber powder are adopted as the main modifier and the auxiliary agent, the modified asphalt with excellent high and low temperature performance and good storage stability is prepared, and the development of the Xinjiang area and the utilization of local asphalt resources are further promoted.
Unless otherwise specified, the specific raw materials used in the examples of the present invention and the comparative examples are known commercially available products, and the specifications of the specific raw materials used in the examples of the present invention and the comparative examples are as follows:
SBS is T6302H brand SBS produced by the petrochemical industry of Dushan, and the block ratio of styrene to butadiene is 30: 70. the number average molecular weight is 8 to 12 ten thousand.
The rubber powder is 30-mesh desulfurized rubber powder or 40-mesh common rubber powder produced by adopting waste truck tires.
The compatilizer is furfural extract oil.
The plasticizer is compounded by dioctyl phthalate and epoxy fatty acid isooctyl ester according to the weight ratio of 60: 40. The blending process of the plasticizer is that the raw materials are mixed according to the proportion and then stirred for 20min at the temperature of 40-50 ℃.
The coupling agent is 3-thiocyano propyl triethoxy silane or 3-octanoyl thio propyl triethoxy silane.
The stabilizer is a common sulfur-containing stabilizer, and the content of active substances is more than or equal to 80 percent.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment provides a Sinkiang asphalt-based SBS/rubber powder composite modified asphalt which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of Xinjiang blend asphalt, 2 parts of SBS, 10 parts of rubber powder, 1.5 parts of compatilizer, 2 parts of plasticizer, 1 part of reinforcing agent, 0.5 part of coupling agent and 0.2 part of stabilizer.
Specifically, the reinforcing agent is tetrapod-like zinc oxide whisker (T-ZnOw).
Specifically, the Xinjiang blend asphalt is prepared by mixing Clarity 90# asphalt and Tahe 60# asphalt according to a weight ratio of 60:40 and blending to obtain the product.
The preparation method of the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt comprises the following steps:
step one, SBS pretreatment:
weighing SBS and compatilizer, respectively preheating the SBS and the compatilizer to 50 ℃, uniformly spraying the compatilizer on the surface of the SBS after the compatilizer has good fluidity, and keeping the temperature for standing for later use;
step two, mixing Xinjiang asphalt:
(1) respectively heating the Clarithromi 90# asphalt and the Tahe 60# asphalt at 135 ℃ until the asphalt flows, taking out the asphalt, mixing the asphalt while heating to the temperature of 150 +/-5 ℃, then stirring the mixture for 60min at 1000-1500 r/min, and standing the mixture for 30min to defoam to obtain the Xinjiang blend asphalt.
Step three, asphalt modification and development:
heating the Xinjiang blend asphalt to 150 +/-5 ℃, then sequentially adding the rubber powder and SBS pretreated by the compatilizer under the stirring condition, and rapidly heating to 170 ℃ while stirring;
stirring for 10min until the modifier is blended into the asphalt, shearing and grinding with a high-speed shearing emulsifying machine or a colloid mill at a low speed of 1000r/min for 10min until the asphalt has no obvious granular sensation, rapidly heating the asphalt to 185 ℃, and shearing at 4500r/min for 15 min;
then adding a plasticizer, keeping the temperature at 160-170 ℃, stirring at a low speed of 500r/min for development for 30min, and fully swelling and developing the modifier;
heating the developed asphalt to 185 ℃, simultaneously adding a reinforcing agent and a coupling agent, shearing at 4500r/min for 25min, adding a stabilizing agent, and continuing to shear for 5min to obtain composite asphalt;
step four, asphalt re-development:
and putting the sheared composite modified asphalt in an oven at 150-160 ℃ for swelling development again for 1-1.5 h to obtain the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt.
The results of the performance test of this example are shown in table 1.
Example 2:
the embodiment provides a Sinkiang asphalt-based SBS/rubber powder composite modified asphalt which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of Xinjiang blend asphalt, 3 parts of SBS, 10 parts of rubber powder, 2.5 parts of compatilizer, 3 parts of plasticizer, 2 parts of reinforcing agent, 1 part of coupling agent and 0.2 part of stabilizer.
Specifically, the reinforcing agent is tetrapod-like zinc oxide whisker (T-ZnOw).
Specifically, the Xinjiang blend asphalt is prepared by mixing Clarity 90# asphalt and Tahe 60# asphalt in a weight ratio of 45: 55 and blending to obtain the product.
The preparation method of the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt in the embodiment is the same as that of the embodiment 1.
The results of the performance test of this example are shown in table 1.
Example 3:
the embodiment provides a Sinkiang asphalt-based SBS/rubber powder composite modified asphalt which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of Xinjiang blend asphalt, 3 parts of SBS, 15 parts of rubber powder, 1.5 parts of compatilizer, 4 parts of plasticizer, 2 parts of reinforcing agent, 1 part of coupling agent and 0.2 part of stabilizer.
Specifically, the reinforcing agent is tetrapod-like zinc oxide whisker (T-ZnOw).
Specifically, the Xinjiang blend asphalt is prepared by mixing Clarity 90# asphalt and Tahe 60# asphalt in a weight ratio of 45: 55 and blending to obtain the product.
The preparation method of the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt in the embodiment is the same as that of the embodiment 1.
The results of the performance test of this example are shown in table 1.
Example 4:
the embodiment provides a Sinkiang asphalt-based SBS/rubber powder composite modified asphalt which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of Xinjiang blend asphalt, 4 parts of SBS, 15 parts of rubber powder, 2.5 parts of compatilizer, 2 parts of plasticizer, 1 part of reinforcing agent, 0.5 part of coupling agent and 0.2 part of stabilizer.
Specifically, the reinforcing agent is tetrapod-like zinc oxide whisker (T-ZnOw).
Specifically, the Xinjiang blend asphalt is prepared by mixing Clarity 90# asphalt and Tahe 60# asphalt in a weight ratio of 45: 55 and blending to obtain the product.
The preparation method of the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt in the embodiment is the same as that of the embodiment 1.
The results of the performance test of this example are shown in table 1.
Example 5:
the embodiment provides a Sinkiang asphalt-based SBS/rubber powder composite modified asphalt which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of Xinjiang blend asphalt, 2 parts of SBS, 20 parts of rubber powder, 2.5 parts of compatilizer, 4 parts of plasticizer, 2 parts of reinforcing agent, 1 part of coupling agent and 0.2 part of stabilizer.
Specifically, the reinforcing agent is tetrapod-like zinc oxide whisker (T-ZnOw).
Specifically, the Xinjiang blend asphalt is prepared by mixing Clarity 90# asphalt and Tahe 60# asphalt in a weight ratio of 45: 55 and blending to obtain the product.
The preparation method of the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt in the embodiment is the same as that of the embodiment 1.
The results of the performance test of this example are shown in table 1.
Example 6:
the embodiment provides a Sinkiang asphalt-based SBS/rubber powder composite modified asphalt which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of Xinjiang blend asphalt, 4 parts of SBS, 20 parts of rubber powder, 1.5 parts of compatilizer, 2 parts of plasticizer, 2 parts of reinforcing agent, 1 part of coupling agent and 0.2 part of stabilizer.
Specifically, the reinforcing agent is tetrapod-like zinc oxide whisker (T-ZnOw).
Specifically, the Xinjiang blend asphalt is prepared by mixing Clarity 90# asphalt and Tahe 60# asphalt according to a weight ratio of 60:40 and blending to obtain the product.
The preparation method of the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt in the embodiment is the same as that of the embodiment 1.
The results of the performance test of this example are shown in table 1.
Example 7:
the embodiment provides a Sinkiang asphalt-based SBS/rubber powder composite modified asphalt which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of Xinjiang blend asphalt, 3 parts of SBS, 15 parts of rubber powder, 3.5 parts of compatilizer, 4 parts of plasticizer, 1 part of reinforcing agent, 0.5 part of coupling agent and 0.2 part of stabilizer.
Specifically, the reinforcing agent is tetrapod-like zinc oxide whisker (T-ZnOw).
Specifically, the Xinjiang blend asphalt is prepared by mixing Clarity 90# asphalt and Tahe 60# asphalt in a weight ratio of 50: 50 and blending to obtain the product.
The preparation method of the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt in the embodiment is the same as that of the embodiment 1.
The results of the performance test of this example are shown in table 1.
Comparative example 1:
the comparative example shows a modified asphalt, which is different from example 3 only in that the Xinjiang blend asphalt of example 3 is replaced with an equal amount of Clarityl 90# asphalt, and no reinforcing agent or coupling agent is added to the modified asphalt of the comparative example.
The modified asphalt of this comparative example was prepared in substantially the same manner as in example 3.
The results of the performance test of this example are shown in table 1.
Comparative example 2:
the comparative example shows a modified asphalt, and the modified asphalt of the comparative example is different from the modified asphalt of example 3 only in that the Xinjiang blend asphalt of example 3 is replaced by the Tahe 60# asphalt with the same amount, and no reinforcing agent or coupling agent is added in the modified asphalt of the comparative example.
The modified asphalt of this comparative example was prepared in substantially the same manner as in example 3.
The results of the performance test of this example are shown in table 1.
Comparative example 3:
the comparative example shows a modified asphalt which differs from example 3 only in that no crumb rubber was added to the modified asphalt of the comparative example.
The modified asphalt of this comparative example was prepared in substantially the same manner as in example 3.
The results of the performance test of this example are shown in table 1.
Comparative example 4:
the comparative example shows a modified asphalt, which is different from example 3 only in that SBS is not added to the modified asphalt of the comparative example.
The modified asphalt of this comparative example was prepared in substantially the same manner as in example 3.
The results of the performance test of this example are shown in table 1.
Comparative example 5:
the comparative example shows a modified asphalt which differs from example 3 only in that no compatibilizer nor plasticizer was added to the modified asphalt of the comparative example.
The modified asphalt of this comparative example was prepared in substantially the same manner as in example 3.
The results of the performance test of this example are shown in table 1.
Comparative example 6:
the comparative example shows a modified asphalt which differs from example 3 only in that no plasticizer is added to the modified asphalt of the comparative example.
The modified asphalt of this comparative example was prepared in substantially the same manner as in example 3.
The results of the performance test of this example are shown in table 1.
Comparative example 7:
this comparative example shows a modified asphalt which differs from example 3 only in that no compatibilizer was added to the modified asphalt of this comparative example.
The modified asphalt of this comparative example was prepared in substantially the same manner as in example 3.
The results of the performance test of this example are shown in table 1.
Comparative example 8:
the comparative example shows a modified asphalt which differs from example 3 only in that no reinforcing agent is added to the modified asphalt of the comparative example.
The modified asphalt of this comparative example was prepared in substantially the same manner as in example 3.
The results of the performance test of this example are shown in table 1.
And (3) performance testing:
in order to verify the performance effect of the composite modified asphalt, the performance test of the SBS/rubber powder composite modified Xinjiang asphalt material prepared in the embodiment of the invention is carried out according to the relevant regulations of the test specification JTGE20-2011 road engineering asphalt and asphalt mixture, and the results are shown in Table 1.
Table 1 shows the performance test results of the SBS/rubber powder composite modified Xinjiang asphalt prepared in the example
As can be seen from Table 1:
(1) examples 1 to 7 all satisfy the index requirements related to rubber modified asphalt, wherein examples 2, 3, 4, 6 and 7 can satisfy the requirements of SBS modified asphalt related specifications, and the preparation method of the composite modified Xinjiang asphalt provided by the invention is superior to the composite modification method provided by the comparative example.
(2) Compared with the composite modified asphalt prepared in the comparative example 1, the performance of the composite modified asphalt prepared by the SBS/rubber powder composite modification method based on Xinjiang base asphalt provided by the invention is obviously higher than that of the Clarityl asphalt modified asphalt prepared by a common method. The composite modified asphalt prepared by the comparative example 1 has poor high-temperature performance, a softening point of only 49.7 ℃, low consistency, a penetration degree of 120.5mm, and is not suitable for road surface courses, and the upper and lower asphalt layers of a test tube in a segregation test are obvious. Compared with the composite modified asphalt prepared in the embodiment 3 of the invention, the softening point can reach 75.5 ℃, the low-temperature ductility can reach 329mm, the softening point difference is only 0.8 ℃ and does not exceed 2.5 ℃, and the asphalt on the upper part and the lower part of the segregation test tube is not obviously layered, so that the defects of insufficient high-temperature performance and storage stability in the comparative example are overcome.
(3) Compared with the composite modified asphalt prepared by the comparative example 2, the performance of the composite modified asphalt prepared by the SBS/rubber powder composite modification method based on the Xinjiang base asphalt provided by the invention is obviously higher than that of the Tahe asphalt composite modified asphalt prepared by the common method. The composite modified asphalt prepared by the comparative example 2 has the disadvantages of high consistency and poor low-temperature performance, the needle penetration at 25 ℃ is as low as 54.5, the ductility at 5 ℃ is only 61mm, the pavement cracking in winter is easily caused when the composite modified asphalt is applied to engineering in Xinjiang, and the softening point difference is as high as 20 ℃ after 48 hours. Compared with the composite modified asphalt prepared in the embodiment 3 of the invention, the softening point can reach 75.5 ℃, the low-temperature ductility can reach 329mm, the softening point difference is only 0.8 ℃ and is not more than 2.5 ℃, and the asphalt on the upper part and the lower part of the segregation test tube is not obviously layered, so that the defects of insufficient low-temperature performance and storage stability in the comparative example are overcome, and the composite modified asphalt is suitable for the characteristics of hot summer and cold winter in Xinjiang areas and long asphalt transportation distance.
(4) Comparing examples 1-7 with comparative example 3 and comparative example 4, it can be seen that the storage stability of the Xinjiang base asphalt modified asphalt prepared by SBS or rubber powder alone can not meet the standard requirements, and comparative example 4 has a ductility of only 213mm, comparative example 3 has a softening point of only 52.0 ℃, and the high and low temperature performance and the segregation resistance are far different from those of example 3 in which SBS and rubber powder are simultaneously mixed in the same proportion.
(5) Compared with the composite modified asphalt prepared in the examples, the comparative examples 5, 6 and 7, the composite modified asphalt prepared in the comparative example 5 without the plasticizer compatilizer has poor low-temperature performance and 5 ℃ ductility of only 135mm, the low-temperature performance of the comparative example 6 after the single compatilizer is added is improved to 156mm, the low-temperature performance of the comparative example 7 after the single plasticizer is added is effectively improved to 208mm, and the low-temperature performance of the composite modified asphalt prepared in the examples with the plasticizer and the compatilizer added at the same time can be improved to 423mm at the highest. The plasticizer and the compatilizer provided by the invention can be used for preparing the composite modified asphalt which has high and low temperature performance and storage stability and is suitable for Xinjiang special geographical and climate conditions.
(6) Comparing example 3 with comparative example 8, it can be seen that comparative example 8 has no tetrapod-like zinc oxide whisker, although the low temperature performance is better, the softening point and viscosity are lower, the segregation softening point difference is as high as 5.9 ℃ in 48h, the tendency of SBS and rubber powder layering appears, and the asphalt high temperature performance is reinforced after the tetrapod-like zinc oxide whisker is added, the segregation softening point difference is reduced, and the storage stability is improved.
(7) Analysis of the examples 1 to 7 shows that the comprehensive performance of the example 3 and the example 4 is more consistent with the geographical characteristics of the Xinjiang region climate, but the example 4 is added with more SBS modifier, so that the manufacturing cost is higher, the 48h softening point is higher, and the segregation risk is higher, therefore, the comprehensive analysis shows that the example 3 has lower segregation risk while guaranteeing the high and low temperature performance, and the comprehensive performance is optimal.
Claims (2)
1. The SBS/rubber powder composite modified asphalt based on Xinjiang asphalt is characterized by being prepared from the following raw materials in parts by weight: 100 parts of Xinjiang blend asphalt, 2-4 parts of SBS, 10-20 parts of rubber powder, 1.5-3.5 parts of compatilizer, 2-4 parts of plasticizer, 1-2 parts of reinforcing agent, 0.5-1 part of coupling agent and 0.2 part of stabilizer;
the reinforcing agent is tetrapod-like zinc oxide whisker;
the Xinjiang blend asphalt is prepared from Clarity 90# asphalt and Tahe 60# asphalt in a weight ratio of (45-60): (40-55) blending to obtain;
the SBS is a linear styrene-butadiene-styrene triblock copolymer, and the block ratio of styrene to butadiene is 30: 70;
the plasticizer is prepared from dioctyl phthalate and epoxy fatty acid isooctyl ester according to a weight ratio of 60:40 are compounded; the blending process of the plasticizer is that the raw materials are mixed according to a proportion and then stirred for 20min at the temperature of 40-50 ℃.
2. A preparation method of SBS/rubber powder composite modified asphalt based on Xinjiang asphalt is characterized in that the method adopts the formula of SBS/rubber powder composite modified asphalt based on Xinjiang asphalt as claimed in claim 1;
the method specifically comprises the following steps:
step one, SBS pretreatment:
weighing SBS and compatilizer, respectively preheating SBS and compatilizer to 50 ℃, uniformly spraying the compatilizer on the surface of SBS, and keeping the temperature for standing for later use;
step two, mixing Xinjiang asphalt:
respectively heating Clarithromi 90# asphalt and Tahe 60# asphalt at 135 ℃ until the asphalt flows, taking out the asphalt, mixing while heating until the temperature is 150 +/-5 ℃, then stirring for 60min at 1000-1500 r/min, standing for 30min, and defoaming to obtain Xinjiang blended asphalt;
step three, asphalt modification and development:
heating the Xinjiang blend asphalt to 150 +/-5 ℃, then sequentially adding rubber powder and SBS pretreated by the compatilizer under the condition of stirring, and heating to 170 ℃ while stirring;
stirring for 10min until the modifier is blended into the asphalt, shearing and grinding with a high-speed shearing emulsifying machine or a colloid mill at a low speed of 1000r/min for 10min until the asphalt has no obvious granular sensation, rapidly heating the asphalt to 185 ℃, and shearing at 4500r/min for 15 min;
then adding a plasticizer, keeping the temperature at 160-170 ℃, stirring at a low speed of 500r/min for development for 30min, and fully swelling and developing the modifier;
heating the developed asphalt to 185 ℃, simultaneously adding a reinforcing agent and a coupling agent, shearing at 4500r/min for 25min, adding a stabilizing agent, and continuing to shear for 5min to obtain composite asphalt;
step four, asphalt re-development:
and putting the sheared composite modified asphalt in an oven at 150-160 ℃ for swelling development again for 1-1.5 h to obtain the SBS/rubber powder composite modified asphalt based on Xinjiang asphalt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010327928.6A CN111518400B (en) | 2020-04-23 | 2020-04-23 | SBS/rubber powder composite modified asphalt based on Xinjiang asphalt and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010327928.6A CN111518400B (en) | 2020-04-23 | 2020-04-23 | SBS/rubber powder composite modified asphalt based on Xinjiang asphalt and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111518400A CN111518400A (en) | 2020-08-11 |
| CN111518400B true CN111518400B (en) | 2022-04-15 |
Family
ID=71904377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010327928.6A Active CN111518400B (en) | 2020-04-23 | 2020-04-23 | SBS/rubber powder composite modified asphalt based on Xinjiang asphalt and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111518400B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117089137B (en) * | 2023-09-11 | 2024-05-24 | 眉山天投新材料有限公司 | Modified asphalt direct-injection agent and preparation method and application thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102993757B (en) * | 2012-12-01 | 2015-07-01 | 江苏宝利沥青股份有限公司 | Preparation method of stable composite modified asphalt |
| CN109705587A (en) * | 2018-08-24 | 2019-05-03 | 济南圣泉集团股份有限公司 | Rubber powder modified agent, multiplicity reactivation rubber powder and preparation method thereof, composite modified asphalt and preparation method thereof |
| CN109957254A (en) * | 2019-03-29 | 2019-07-02 | 新疆交建路友道路材料科技有限公司 | A kind of preparation method of SBS modified pitch |
-
2020
- 2020-04-23 CN CN202010327928.6A patent/CN111518400B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111518400A (en) | 2020-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109777134B (en) | High-modulus warm mix asphalt additive and preparation method and application thereof | |
| CN101235172B (en) | Asphalt pavement rubber plastic composite anti-rut agent and preparation method thereof | |
| CN102532920B (en) | Warm-mixed asphalt cement and preparation method thereof | |
| CN104725883B (en) | A kind of high-viscosity high-elasticity asphalt being modified based on rubber particle surface, SMA asphalts and preparation method thereof | |
| CN101948623A (en) | Rubber powder modified emulsified asphalt and preparation method thereof and CA mortar prepared by emulsified asphalt | |
| CN105236831A (en) | Aged-asphalt regeneration agent, regenerated asphalt mixture and preparation method of two | |
| CN102061099A (en) | Strong-viscosity emulsified modified asphalt and preparation method thereof | |
| CN105647207B (en) | A kind of SBS modified pitch resistant to high temperature and preparation method thereof | |
| CN107722650A (en) | A kind of environmentally friendly high viscosity modified pitch and preparation method thereof | |
| CN109385106A (en) | Low viscous high performance modified bitumen of one kind and preparation method thereof | |
| CN103305015A (en) | Warm-mixing high-elastoplasticity bridge expansion joint sealing material and preparation method thereof | |
| CN113025071B (en) | High-doping-amount SBS (styrene butadiene styrene) modified emulsified asphalt for cold-mix plant recycling and preparation method thereof | |
| CN102993757B (en) | Preparation method of stable composite modified asphalt | |
| WO2023115672A1 (en) | Asphalt modifier, and preparation method therefor and use thereof | |
| CN109705365A (en) | A kind of preparation method of environment-friendly type composite modified asphalt | |
| CN103360774A (en) | Asphaltized rubber modified asphalt and preparation method thereof | |
| CN102718438A (en) | Bridge floor seamless expansion joint material with large expansion amount and preparation method thereof | |
| CN106519718A (en) | High-modulus asphalt additive | |
| CN103044933B (en) | Polymer modified asphalt stabilizer composition | |
| CN106630731A (en) | Composite modifier and high-scattering-resistance drainage asphalt concrete prepared through same | |
| CN111518400B (en) | SBS/rubber powder composite modified asphalt based on Xinjiang asphalt and preparation method thereof | |
| CN104629150B (en) | A kind of high-performance compound polyolefin Asphalt mixture anti-rut agent composition and preparation method thereof | |
| CN103819918A (en) | Composite high-viscosity modified asphalt and preparation method thereof | |
| CN113185847A (en) | Environment-friendly economical asphalt composition and application thereof | |
| CN112062495A (en) | Warm-mix regenerant and preparation method of warm-mix regenerated asphalt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |