CN108752945A

CN108752945A - High performance modified bitumen based on graphene and production method

Info

Publication number: CN108752945A
Application number: CN201810502895.7A
Authority: CN
Inventors: 黄刚; 周超; 张霞; 袁小亚; 李妍; 杨涛; 黄杨程; 李力; 孙玉恒; 冯曼曼; 贺俊玺; 刘昭
Original assignee: Chongqing Jiaotong University
Current assignee: Chongqing Jiaotong University
Priority date: 2018-05-23
Filing date: 2018-05-23
Publication date: 2018-11-06

Abstract

The present invention proposes a kind of high performance modified bitumen and production method based on graphene, wherein high performance modified bitumen is made of 70# matrix pitches, graphene and stearmide；The quality proportioning relationship of 70# matrix pitches, graphene and stearmide is：The quality of graphene is the 20 ‰ of 70# matrix pitch quality, and the quality of stearmide is the 1% of graphene quality.The method have the benefit that：It proposes and a kind of being suitable for industrial high performance modified bitumen and production method based on graphene.

Description

High performance modified bitumen based on graphene and production method

Technical field

The present invention relates to a kind of modified asphalt manufacturing technology more particularly to a kind of high performance modified bitumens based on graphene And production method.

Background technology

Highway construction is to weigh the important indicator of the national economic development, and highway in China construction in recent years achieves huge hair Exhibition, ended for the end of the year 2014, and highway in China total kilometrage has broken through 4,450,000 kilometers, occupied the first in the world；In all highway constructions Cheng Zhong, bituminous paving occupy the overwhelming majority, due to factors such as volume of traffic increase, vehicle enlargement, vehicle heavy duty and the temperature difference Phenomena such as track, cracking occur in the presence of, bituminous paving happens occasionally, and causes Service Performance of Asphalt Pavement to decline, therefore traffic row More stringent requirements are proposed for performance and quality of the industry to bituminous paving, it is desirable to which the application and innovation for accelerating new material, new technology subtract The diseases such as few Protective Measures of Bitumen Pavement Initial Damage.

Currently, to bituminous paving improve benefit it is maximum be SBS modified pitch development；Practice have shown that in matrix pitch Middle addition SBS modifier can significantly improve high-temperature stability, anti-fatigue performance and the temperature sensitivity on road surface；But it is actually answering In, there are the preparation condition requirements high, storage unstable (easily layering, cohesion or isolation) of SBS modified pitch, to mix and stir construction relatively tired The problems such as difficult, cause the quality controllability of pitch and asphalt not good enough, influences the performance of bituminous paving to a certain degree.

Graphene is a kind of nano material with huge specific surface area and superpower surface-active, and experiment proves, in pitch Middle addition graphene can generate the physics of pitch, chemical property special effect, to improve asphalt performance comprehensively；But It is in actual production, graphene but can not directly to be added in pitch：Experiments have shown that the additive amount when graphene reaches one When determining degree, graphene will appear serious agglomeration traits, and graphene can not be uniformly dispersed in pitch, cause graphene can not Modified effect is played to pitch.

Invention content

To solve the problems in background technology, inventor uses a variety of surfactants and basic solvent (can be with pitch It is miscible or easily and separated from bitumen, to observe the dispersion effect of graphene) tested, having eventually found one kind can be by graphene Finely dispersed surfactant-stearmide, corresponding basic solvent are trichloro ethylene；To determine pitch, surface-active The optimum proportioning and optimum process condition of agent and basic solvent, inventor have carried out following experiment：

1) Uniform ity Design Method is used, graphene volume (ratio of graphene quality and 70# matrix pitch quality) is made to exist 2 ‰~20 ‰ range, stearmide volume (ratio of stearmide quality and graphene quality) are 1%~10% Range, shear rate 2000~6500 revs/min of ranges, shear time 30min~180min ranges, Shear temperature is in 110 DEG C~150 DEG C ranges；The factor level table of experimental design is as shown in table 1, uniform designs table such as table 2 Shown, experiment arranges as shown in table 3；

Table 1

Table 2

Table 3

Each time the performance indicator for testing obtained graphene modified pitch is as shown in table 4；

Table 4

Test data is analyzed using mathematical statistics software, obtains (the optimization i.e. in table 5 of 3 groups of optimization material prescriptions Solution) as shown in table 5；

Table 5

Optimization solution	Shear rate (r.p.m.)	Shear time (min)	Graphene volume (‰)	Stearmide volume (%)	Shear temperature (DEG C)
						1	6500	30	20	10	150
2	7000	200	20	8.26	160
						3	6500	180	20	1	140

Graphene modified pitch is prepared according to three groups of optimization material prescriptions, the performance indicator of three obtained group modified pitch is such as Shown in table 6；

Table 6

By table 6 as it can be seen that compared to optimization material prescription 1 and optimization material prescription 2, the stone obtained by optimization material prescription 3 The anti-low-temperature cracking ability of black alkene modified pitch is more notable, therefore chooses optimization material prescription 3 and be used as most optimum materials formula；According to most The performance indicator of graphene modified pitch and matrix pitch comparison made from excellent material prescription is as shown in table 7；

Table 7

By table 7 as it can be seen that compared to matrix pitch, it is formulated graphene modified pitch obtained according to most optimum materials, 5 DEG C are prolonged Degree acting (anti-low-temperature cracking ability) improve 10.4 times, creep recovery rate (delayed elasticity recovery capability) improve 9.2 times, softening Point (high-temperature resistance) increases 6.2 DEG C, and performance of modified bitumen is obviously improved.

Then, the present invention has obtained following scheme：

A kind of high performance modified bitumen based on graphene, innovation are：The high performance modified bitumen is by 70# matrix Pitch, graphene and stearmide composition；The quality proportioning relationship of 70# matrix pitches, graphene and stearmide is：Graphene Quality be the 20 ‰ of 70# matrix pitch quality, the quality of stearmide is the 1% of graphene quality.

To keep the performance indicator of high performance modified bitumen more excellent, the invention also provides following preferred embodiments：The stone The specific surface area of black alkene is 300~400m²The single layer rate of/g, graphene are more than 80%, and the phosphorus content of graphene is more than 98.9%.

A method of high performance modified bitumen being prepared, innovation is：The method includes：

1) trichloro ethylene to stearmide is added into stearmide to be completely dissolved, obtains mixed solution；

2) under air-tight state, the ultrasonic vibration carried out 1.5 hours to mixed solution is handled；

3) mixed solution is added in 70# matrix pitches, is then stood under closed environment, until mixed solution and 70# Matrix pitch merges completely, obtains mixture A；

4) operation is evaporated to mixture A using Rotary Evaporators, trichloro ethylene is evaporated from mixture A, is obtained To mixture B；The condition of evaporation operation is：110 DEG C of oil bath temperature, 85~90 revs/min of rotary speed；

5) mixture B is sheared, obtains high performance modified bitumen；6500 revs/min of shear rate, shear temperature 140 DEG C, shear time 180 minutes；

In preceding method, the quality of graphene is the 20 ‰ of 70# matrix pitch quality, and the quality of stearmide is graphene The 1% of quality.

Graphene modified pitch is made using the present invention program, can effectively solve the graphene occurred in production process reunion Problem enables graphene to be evenly dispersed in pitch and plays corresponding modifying function, is particularly suitable for graphene and is modified drip Green a large amount of making.

The method have the benefit that：It proposes and a kind of being suitable for the industrial high-performance based on graphene and change Property pitch and production method.

Specific implementation mode

Further, the specific surface area of the graphene is 300~400m²The single layer rate of/g, graphene are more than 80%, stone The phosphorus content of black alkene is more than 98.9%.

The quality of the graphene is the 20 ‰ of 70# matrix pitch quality, and the quality of stearmide is graphene quality 1%.

Claims

1. a kind of high performance modified bitumen based on graphene, it is characterised in that：The high performance modified bitumen is dripped by 70# matrix Green, graphene and stearmide composition；The quality proportioning relationship of 70# matrix pitches, graphene and stearmide is：Graphene Quality is the 20 ‰ of 70# matrix pitch quality, and the quality of stearmide is the 1% of graphene quality.

2. the high performance modified bitumen according to claim 1 based on graphene, it is characterised in that：The ratio of the graphene Surface area is 300~400m²The single layer rate of/g, graphene are more than 80%, and the phosphorus content of graphene is more than 98.9%.

3. a kind of method preparing high performance modified bitumen, it is characterised in that：The method includes：

4) operation is evaporated to mixture A using Rotary Evaporators, trichloro ethylene is evaporated from mixture A, is mixed Close object B；The condition of evaporation operation is：110 DEG C of oil bath temperature, 85~90 revs/min of rotary speed；

5) mixture B is sheared, obtains high performance modified bitumen；6500 revs/min of shear rate, 140 DEG C of shear temperature, Shear time 180 minutes；

The quality of the graphene is the 20 ‰ of 70# matrix pitch quality, and the quality of stearmide is the 1% of graphene quality.