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A kind of preparation method of modified blend asphalt for road construction

An asphalt and blending technology, applied in construction, building components, building construction, etc., can solve the problems of insufficient supply of petroleum asphalt, rising prices, and high content of polycyclic aromatic hydrocarbons, achieving solvent recovery, solving high cost and simple operation. Effect

Active Publication Date: 2020-11-27
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, such as the high content of toxic polycyclic aromatic hydrocarbons in coal tar pitch, the shortage of petroleum asphalt, and the rising price, the purpose of the present invention is to provide an economical and environmentally friendly method for preparing modified blended asphalt for road construction.

Method used

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  • A kind of preparation method of modified blend asphalt for road construction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Firstly, the sample is pretreated, specifically, the coal tar pitch is crushed to be below 100 mesh, and the petroleum pitch is made into 4-6 g small pitch blocks. Then, put 7.5g of petroleum pitch and a sufficient amount of toluene solvent in the reactor, and ultrasonically vibrate for 20-30 minutes to completely dissolve the petroleum pitch in the toluene solvent, then add 2.5g of coal tar pitch and 0.5g of KHSO 4 After the catalyst is completely dissolved, it is placed in a constant temperature water bath at 50°C, continuously stirred at a speed of 600r / min, and reacted for 2 hours. The permanent blended asphalt product 1 was used after vacuum drying at 70°C for 12 hours. The solvent toluene is recovered or used in the blending modification reaction process of petroleum pitch and coal pitch.

Embodiment 2

[0022] First, the sample is pretreated, and the specific steps are the same as in Example 1. Then, put 7.5g of petroleum pitch and a sufficient amount of toluene solvent in the reactor, and ultrasonically vibrate for 20-30 minutes to completely dissolve the petroleum pitch in the toluene solvent, then add 2.5g of coal tar pitch and 0.5g of molecular sieve ZSM-5 catalyst, After being completely dissolved, put it in a constant temperature water bath at 50°C, continuously stir at a speed of 600r / min, react for 2 hours, and then go through solvent recovery and product aging steps to obtain modified blended asphalt product 2 and solvent toluene. Solvent recovery and product aging steps are the same as in Example 1.

Embodiment 3

[0024] First, the sample is pretreated, and the specific steps are the same as in Example 1. Then, put 7.5g of petroleum pitch and a sufficient amount of toluene solvent in the reactor, ultrasonically vibrate for 20-30 minutes to completely dissolve the petroleum pitch in the toluene solvent, then add 2.5g of coal tar pitch and 0.5g of p-toluenesulfonic acid catalyst, After being completely dissolved, place it in a constant temperature water bath at 50°C, continuously stir at a speed of 600r / min, react for 2 hours, and then go through solvent recovery and product aging steps to obtain modified blended asphalt product 3 and solvent toluene. Solvent recovery and product aging steps are the same as in Example 1.

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Abstract

The invention discloses a preparation method for a cost-efficient and environment-friendly modified blended asphalt for road construction. According to the method, petroleum asphalt is completely dissolved into toluene solvent by ultrasonic oscillation under normal temperature, coal pitch and acidic catalyst are then added together, the mixture is put into a thermostat water bath to react at constant rotational speed, a reduced pressure distillation means is adopted to recover the toluene solvent for recycling after the reaction is complete, residue is then dried under vacuum for 12 hours, andthereby the modified blended asphalt for road construction is obtained. According to the invention, the process is simple, the preparation period is short, needed energy consumption is low, the pavement performance of the obtained modified blended asphalt product is obviously improved, moreover, the content of polycyclic aromatic hydrocarbon is low, the low toxicity of coal asphalt as an added component for road construction is basically realized, and thereby the cost of road asphalt is greatly reduced; and furthermore, the petroleum asphalt has better compatibility than other polymer or compound modifiers, solving the phenomenon of segregation which can easily take place after modified asphalt is stored for a long term.

Description

technical field [0001] The invention relates to a method for preparing economical and environment-friendly modified blended asphalt for road construction, and belongs to the technical field of asphalt modification. Background technique [0002] With the continuous, healthy and rapid development of my country's national economy, the road transportation industry has also begun to develop vigorously, and the demand for road asphalt has continued to grow. Petroleum asphalt has always dominated the road asphalt market. From 2001 to 2013 In 2019, the average growth rate of petroleum asphalt reached 10.6%. It is estimated that by 2020, the demand for petroleum asphalt will reach 25 million tons per year, and the price will also rise all the way. The composition and properties of coal tar pitch and petroleum pitch are very similar. In contrast, the advantages of coal tar pitch are as follows: 1. The output of coal tar pitch is huge, the source is wide, and it is cheaper than the comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C10C1/18
CPCC08L95/00C08L2205/025C10C1/18
Inventor 申峻王玉高曹嘉慧牛艳霞刘刚李瑞丰徐青柏
Owner TAIYUAN UNIV OF TECH
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