CN103232718A - Silica fume/SBS composite modified asphalt and preparation method thereof - Google Patents

Abstract

The invention relates to the silica fume/SBS composite modified asphalt and a preparation method thereof. The silica fume/SBS composite modified asphalt comprises the following composition by weight percent: 85 to 97 percent of substrate asphalt, 1 to 10 percent of silicate fume and 2 to 5 percent of styrene-butadiene-styrene embedded copolymer. The preparation method comprises the following steps of (1) preparing 91 to 95 percent of the substrate asphalt, 2 to 5 percent of styrene-butadiene-styrene embedded copolymer and 1 to 10 percent of silicate fume; (2) heating the substrate asphalt to 160 to 200 DEG C, mixing the substrate asphalt with 2 to 5 percent of styrene-butadiene-styrene embedded copolymer and 1 to 10 percent of silicate fume for 15 to 60 min, and uniformly dispersing the styrene-butadiene-styrene embedded copolymer and t he silicate fume into the substrate asphalt; and (3) heating the product obtained in the step (1) to 160 to 200 DEG C, and cutting the product for 30 to 120 min at a high speed of 4000 to 6000 r/min to prepare the composite modified asphalt.

Description

SILICA FUME/SBS composite modified asphalt and preparation method thereof

Technical field

The present invention relates to a kind of technology of preparing of modifying asphalt.

Background technology

Modifying asphalt refers to rubber powder or other packing type additives of high molecular polymers such as admixture rubber, plastics, fine grinding according to definition, and it is evenly mixed with pitch, and the character that makes pitch is improved and the asphalt mixture made.

SBS is styrene-butadiene-styrene block copolymer, coming the maximum characteristics of modifying asphalt with SBS is that it has high temperature, cryogenic effect preferably, possesses outstanding antifatigue simultaneously, ageing resistance, thereby improved the over-all properties on road surface, improved weather resistance.

SILICA FUME is to produce the industrial dust of ferrosilicon or Pure Silicon Metal, makes through recovery.Owing to produce ferrosilicon or the very high electric furnace of Pure Silicon Metal use temperature, the silicon of volatilization is oxidized to silicon-dioxide in air, in air, form small particle (diameter is between 10～100nm), reclaim by dust removal installation, make SILICA FUME product (being commonly called as the silicon ash) after the packing.Its major ingredient is SiO2, has that resistance to chemical attack, thermostability and dimensional stability are good, mechanical property and electrical property are good and have advantage such as strengthening action.

Modifying asphalt adopts polymer modification and mineral-modified more at present, and wherein polymer modification is most widely used with the SBS modifying asphalt again, best results.Yet simple SBS modification approach cost is too high, so the composite inorganic thing carries out modification and become focus in polymer modified asphalt.

At present yet there are no SILICA FUME combined styrene-butadiene-styrene block copolymer modifying asphalt in the industry.

Summary of the invention

The purpose of this invention is to provide a kind ofSILICA FUME/SBS composite modified asphalt and preparation method thereof.

The present invention is SILICA FUME/SBS composite modified asphalt and preparation method thereof, SILICA FUME/SBS composite modified asphalt, by mass percentage, its component is: matrix pitch is 85% ~ 97%, SILICA FUME is 1% ~ 10%, and styrene-butadiene-styrene block copolymer is 2% ~ 5%.

The preparation method of SILICA FUME/SBS composite modified asphalt the steps include:

(1) press matrix pitch 91 ~ 95%, styrene-butadiene-styrene block copolymer 2 ~ 5%, SILICA FUME 1% ~ 10% is got the raw materials ready;

When (2) matrix pitch being heated to 160 ℃ ~ 200 ℃, the styrene-butadiene-styrene block copolymer of adding 2 ~ 5% and 1% ~ 10% SILICA FUME stir 15 ~ 60min, make its even dispersion;

(3) step (1) products therefrom is warming up to 160 ℃ ~ 200 ℃, uses shears with 4000 ~ 6000r/min high speed shear, 30 ~ 120min again, make composite modified asphalt.

Usefulness of the present invention is:1. reduce the consumption of SBS in modifying asphalt, reduced production cost;

2. employed SILICA FUME is the industrial waste material, and is cheap, and the waste recycling is conducive to the comprehensive use of resource;

3. He Cheng modifying asphalt has pavement performance preferably;

4. the method for employing simple agitation dispersion reduces greatly to the requirement of equipment, work simplification, and cost reduces.

Embodiment

The present invention is SILICA FUME/SBS composite modified asphalt and preparation method thereof, SILICA FUME/SBS composite modified asphalt, by mass percentage, its component is: matrix pitch is 85% ~ 97%, SILICA FUME is 1% ~ 10%, and styrene-butadiene-styrene block copolymer is 2% ~ 5%.

The preparation method of SILICA FUME/SBS composite modified asphalt the steps include:

(1) press matrix pitch 91 ~ 95%, styrene-butadiene-styrene block copolymer 2 ~ 5%, SILICA FUME 1% ~ 10% is got the raw materials ready;

When (2) matrix pitch being heated to 160 ℃ ~ 200 ℃, the styrene-butadiene-styrene block copolymer of adding 2 ~ 5% and 1% ~ 10% SILICA FUME stir 15 ~ 60min, make its even dispersion;

(3) step (1) products therefrom is warming up to 160 ℃ ~ 200 ℃, uses shears with 4000 ~ 6000r/min high speed shear, 30 ~ 120min again, make composite modified asphalt.

Above-describedStir speed (S.S.) is 100 ~ 200r/min.

Embodiment 1

Take by weighing 4% SBS, 1% SILICA FUME, 95% matrix pitch according to mass percent, under 170 ℃ temperature, the measured matrix pitch of scale is melted, SBS and SILICA FUME are joined in the matrix pitch after the fusing, keep steady temperature, simple agitation, disperse 30min, shears obtains SILICA FUME/SBS composite modified asphalt with 5000r/min high speed shear 100min.

Embodiment 2

Take by weighing 4% SBS, 3% SILICA FUME, 93% matrix pitch according to mass percent, under 170 ℃ temperature, the measured matrix pitch of scale is melted, SBS and SILICA FUME are joined in the matrix pitch after the fusing, keep steady temperature, simple agitation, disperse 30min, shears obtains SILICA FUME/SBS composite modified asphalt with 5000r/min high speed shear 100min.

ImplementExample 3

Take by weighing 4% SBS, 5% SILICA FUME, 91% matrix pitch according to mass percent, under 170 ℃ temperature, the measured matrix pitch of scale is melted, SBS and SILICA FUME are joined in the matrix pitch after the fusing, keep steady temperature, simple agitation, disperse 30min, shears obtains SILICA FUME/SBS composite modified asphalt with 5000r/min high speed shear 100min.

Embodiment 4

Take by weighing 4% SBS, 7% SILICA FUME, 89% matrix pitch according to mass percent, under 170 ℃ temperature, the measured matrix pitch of scale is melted, SBS and SILICA FUME are joined in the matrix pitch after the fusing, keep steady temperature, simple agitation, disperse 30min, shears obtains SILICA FUME/SBS composite modified asphalt with 5000r/min high speed shear 100min.

ImplementExample 5

Take by weighing 4% SBS, 9% SILICA FUME, 87% matrix pitch according to mass percent, under 170 ℃ temperature, the measured matrix pitch of scale is melted, SBS and SILICA FUME are joined in the matrix pitch after the fusing, keep steady temperature, simple agitation, disperse 30min, shears obtains SILICA FUME/SBS composite modified asphalt with 5000r/min high speed shear 100min.

Embodiment 6

Take by weighing 2% SBS, 3% SILICA FUME, 95% matrix pitch according to mass percent, under 170 ℃ temperature, the measured matrix pitch of scale is melted, SBS and SILICA FUME are joined in the matrix pitch after the fusing, keep steady temperature, simple agitation, disperse 30min, shears obtains SILICA FUME/SBS composite modified asphalt with 5000r/min high speed shear 100min.

Embodiment 7

Take by weighing 2% SBS, 5% SILICA FUME, 93% matrix pitch according to mass percent, under 170 ℃ temperature, the measured matrix pitch of scale is melted, SBS and SILICA FUME are joined in the matrix pitch after the fusing, keep steady temperature, simple agitation, disperse 30min, shears obtains SILICA FUME/SBS composite modified asphalt with 5000r/min high speed shear 100min.

ImplementExample 8

Take by weighing 2% SBS, 7% SILICA FUME, 91% matrix pitch according to mass percent, under 170 ℃ temperature, the measured matrix pitch of scale is melted, SBS and SILICA FUME are joined in the matrix pitch after the fusing, keep steady temperature, simple agitation, disperse 30min, shears obtains SILICA FUME/SBS composite modified asphalt with 5000r/min high speed shear 100min.

To the SILICA FUME/SBS composite modified asphalt of embodiment 1 to embodiment 8 gained, done following performance test respectively, it the results are shown in following table:

Table 1 SILICA FUME/SBS composite modified asphalt The performance test results

Embodiment 1 to embodiment 4 has been carried out weathering test, and the result is as shown in the table for its performance test:

The aging back of table 2 SILICA FUME SBS composite modified asphalt The performance test results

Claims (3)

1. SILICA FUME/SBS composite modified asphalt, by mass percentage, its component is: matrix pitch is 85% ~ 97%, and SILICA FUME is 1% ~ 10%, and styrene-butadiene-styrene block copolymer is 2% ~ 5%.

2. the preparation method of SILICA FUME/SBS composite modified asphalt the steps include:

(1) press matrix pitch 91 ~ 95%, styrene-butadiene-styrene block copolymer 2 ~ 5%, SILICA FUME 1% ~ 10% is got the raw materials ready;

When (2) matrix pitch being heated to 160 ℃ ~ 200 ℃, the styrene-butadiene-styrene block copolymer of adding 2 ~ 5% and 1% ~ 10% SILICA FUME stir 15 ~ 60min, make its even dispersion;

(3) step (1) products therefrom is warming up to 160 ℃ ~ 200 ℃, uses shears with 4000 ~ 6000r/min high speed shear, 30 ~ 120min again, make composite modified asphalt.

3. the preparation method of SILICA FUME according to claim 2/SBS composite modified asphalt is characterized in that stir speed (S.S.) is 100 ~ 200r/min.