Preparation method of chemically modified asphalt

A chemical modification and asphalt technology, applied in the field of chemically modified asphalt preparation, can solve the problems of useless improvement of molecular structure, precipitation and separation, poor flexibility, etc. relay effect

Active Publication Date: 2013-01-02
JURONG NINGWU SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this bitumen modification method has improved the problems of strong temperature sensitivity, low viscosity, and p

Method used

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Examples

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Effect test

Embodiment 1

[0017] A method for preparing chemically modified asphalt: under the action of an initiator, the method reacts base asphalt with naphthalene vinyl compounds to prepare chemically modified asphalt. The steps are as follows:

[0018] 1) Add 100 parts of petroleum pitch heated to 90~130 ℃ (mass, the same below) into the reactor, and add 0.3 parts of initiator benzoyl peroxide;

[0019] 2) Raise the temperature to 130 °C, add 1.5 parts of butadiene and 5 parts of 2-vinylnaphthalene, and pass N 2 Keep the pressure of the reactor at 0.2 MPa, react for 4 h, and then degas for 20 min. After filtration, the modified asphalt with greatly improved low-temperature toughness is obtained.

Embodiment 2

[0021] Yet another method for preparing chemically modified asphalt: under the action of an initiator, the base asphalt is reacted with allyl sulfide compounds to obtain chemically modified asphalt. In this method, allyl sulfide The compound replaces the naphthalene vinyl compound, and the steps are as follows:

[0022] 1) Add 100 parts of petroleum pitch heated to 90~130 ℃ (mass, the same below) into the reactor, and add 0.8 parts of initiator benzoyl peroxide;

[0023] 2) Raise the temperature to 120 °C, add 5 parts of diallyl sulfide and 1.2 parts of isoprene, maintain the pressure at 0.3 MPa, react for 5 h, degas and filter, and then obtain modified asphalt with greatly improved low-temperature toughness.

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Abstract

The invention discloses a preparation method of chemically modified asphalt. The method comprises the steps of: adding matrix asphalt into a reactor; adding an initiator 0.05-1wt% of the matrix asphalt; heating to 80-160 DEG C; adding naphthalene vinyl compounds and conjugated olefinic compounds; maintaining the pressure at 0.1-0.4 MPa; reacting for 4-6h; degassing; and filtrating to obtain the modified asphalt. The method for modifying asphalt can endow the produced asphalt with good usage performance, and can effectively improve liquidity at high temperature and flexural performance at low temperature, so as to meet the requirements of highway, bridge and housing on asphalt.

Description

technical field [0001] The invention relates to a method for preparing modified asphalt, in particular to a method for preparing chemically modified asphalt by chemically modifying asphalt with unsaturated double bond compounds. Background technique [0002] Asphalt is widely used in road paving, road repair and maintenance. Compared with gravel road, the strength and stability of this kind of road are greatly improved. Compared with cement concrete pavement, asphalt pavement has smooth surface without joints, low driving vibration, low noise, fast open traffic, easy maintenance, suitable for phased construction of pavement, and is an important structural form of pavement in my country. However, ordinary asphalt materials have poor temperature stability, are prone to brittleness in winter, and are easy to soften in summer; the compacted mixture has a large void ratio, poor water resistance, and is prone to water damage. In order to overcome the disadvantages of ordinary asp...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F212/32C08F236/06C08F236/08C08F222/06C08F232/06C08F228/04
Inventor 应军翟洪金郑磊巫丹史红丽
Owner JURONG NINGWU SCI & TECH DEV
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