CN1015467B

CN1015467B - Process for preparation of composite modified asphalt

Info

Publication number: CN1015467B
Application number: CN 90102904
Authority: CN
Inventors: 严家伋
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 1990-07-19
Filing date: 1990-07-19
Publication date: 1992-02-12
Also published as: CN1048867A

Abstract

The present invention relates to a manufacture method for composite modified asphalt belonging to the road making materials in road engineering. SBS is proportionally swollen and regulated with swelling regulating agents, and the swollen SBS and asphalt are mixed and stirred so as to be manufactured into mother liquid of modified SBS asphalt; the mother liquid of modified SBS asphalt and carbon black preprocessed by swelling regulating agents are added to an asphalt tank according to the modified mixture ratio and evenly stirred, and then the composite modified asphalt is manufactured. The composite modified asphalt, rubble, sand and mineral powder are mixed according to the conventional ratio, and then the mixture can be used for paving roads on the site, bridge decks and airport runways.

Description

Process for preparation of composite modified asphalt

A kind of composite modified asphalt belongs to highway engineering road-making material technical field, is applicable to build high grade highway pavement, airfield runway, deck paving, and the various anti-crack films of bituminous pavement.

Build the road surface of high-grade highway (comprising motorway and I and II highway), consider the increase that highway Shanghai Automobile Factory axletree carries, the raising of the speed of a motor vehicle, traffic density increases and the influence of traffic channelling road pavement, and the high-quality asphalt that refining goes out from the high-quality petroleum crude oil commonly used i.e. " heavy traffic asphaltum " is built the road surface.Though also have in China and seldom to measure high-quality crude, but can be still very limited for the quantity of producing " heavy traffic asphaltum ", the most of oil of China belong to intermediate base or paraffinic crude, and adopting existing refining process is to produce " heavy traffic asphaltum " that be fit to build high grade highway pavement.Moreover, by the world recently achievement in research show, rely on high-quality asphalt and rubble merely.The asphalt of composition such as sand and breeze can not satisfy the requirement of modern transportation, therefore, must add the 5th kind of material (properties-correcting agent) pitch is carried out modification, the road surface of adopting modified asphalt mixture to build, could adapt to modernized heavy type, at a high speed, the requirement of canalization, traffic.

The method that is used for modifying asphalt at present: 1) adopt various types of resins, rubber-like polymer, go so far as thermoplastic elastomer, be spiked into as properties-correcting agent as styrene-butadiene copolymer (being SBS) etc. and go in the pitch, improve the bituminous performance and improve the high-temperature stability low-temperature cracking-resistance etc. of asphalt.But these methods often will expend a large amount of valuable solvents or specific equipment that some is complicated in the asphalt modification process, and solvent is promptly harmful to operator in entire work process, is again inflammable articles, requires very high to fire safety.Therefore, with the modifying asphalt that these methods obtain, cost height, can only improve high-temperature stability or low-temperature cracking-resistance at aspect of performance, the two often can not be taken into account usually.So these class methods do not obtain promoting so far, are effectively applied in the road engineering.2) make bituminous properties-correcting agent with carbon black.Just there is patent in the U.S. in one's early years, provided a kind of carbon black of using as filler afterwards in the Australian Patent (Australia 256,776), add natural rubber or synthetic rubber simultaneously and obtain the method for modifying asphalt, United States Patent (USP) (U.S3,277,038) propose to add pitch and obtain modifying asphalt with isoprene-isobutylene rubber (or polyisobutene) and carbon black.Though the modifying asphalt high-temperature behavior that these two kinds of methods obtain has clear improvement, low-temperature performance is also failed the improvement that obtains expecting, have in addition worsen on the contrary.Therefore, do not applied widely yet.

The objective of the invention is to: adopt commercially available home-made pitch, it is carried out composite modified, become " heavy traffic asphaltum " with high-temperature stability and low-temperature cracking-resistance.And manufacturing process is simple, does not need Special Equipment, and is easy and simple to handle, and easily for highway construction department grasps, pollution-free, cost is low.

The present invention realizes like this, at first the (resin-diblock rubber analog copolymer of the thermoplastic elastomer with resin and rubber characteristic, as the polystyrene-poly butadienecopolymer, be called for short SBS), carrying out swelling with the swelling conditioning agent regulates, the swelling conditioning agent is a kind of product that obtains in petroleum refining, and its aromatic index is f _a=0.200～0.400, physical index is:

The sequence number project indicator

1 kinematic viscosity (100 ℃) μ m ²/ s 5～60

2 flash-points (opening agar diffusion method) ℃＞230

3 initial boiling points (distillation under vacuum) ℃＜300

Colourless or the little Huang of 4 appearance colors (range estimation) is transparent

In SBS: the ratio of swelling conditioning agent 1:0.5～2.0 weight ratios, swelling is regulated under 20 ℃～25 ℃ temperature, and swelling time 24-72 hour, (deciding according to the SBS performance) moved closer to the consistency between SBS and the pitch.Then, according to used pitch situation, join in the pitch behind the hot melt in the ratio of 1: 5～7 weight ratios SBS after swelling, and in stirrer, be stirred to evenly, because physics and chemical dual effect make SBS and pitch form the SBS modifying asphalt mother liquor with the upright structure interpenetrating(polymer)networks in space.Meanwhile, carbon black is given processing, become the carbon black disperse means with the swelling conditioning agent.Concrete grammar is, the swelling conditioning agent is sprayed cloth equably on carbon black, makes its surface wettability, after 12～24 hours reaction, mix thoroughly the carbon black disperse means of loose shape.Be SBS modifying asphalt mother liquor and carbon black disperse means that 3～5% weight percents of pitch weight and 2～5% weight percent proportioning pumps that carbon black is pitch weight are delivered to temperature and are equipped with in the bituminous pitch bay at 120～160 ℃ by SBS respectively then, be composite modified asphalt after stirring.Pump in another pitch storage pond standby.Also can be earlier be SBS modifying asphalt mother liquor that 3～5% weight percents of pitch weight are pumped to temperature and are equipped with at 120-160 ℃ and make modifying asphalt after stirring in the bituminous pitch bay by SBS, be that the 2-5% weight percent of pitch weight is pumped in the pitch bay with the carbon black disperse means by carbon black then, be composite modified asphalt after stirring.As the sampling and measuring performance, index does not also reach requirement, can repeat said process, adds SBS modifying asphalt mother liquor or carbon black disperse means or pitch at pitch.

The invention has the advantages that:

1, comes swelling SBS with the swelling conditioning agent, regulate SBS and bituminous consistency.This swelling conditioning agent promptly is a kind of properties-correcting agent, is a kind of component of SBS modifying asphalt simultaneously, can improve the bituminous performance.Save a large amount of valuable solvents like this, also do not needed Special Equipments such as solvent recuperation.

2, composite modified asphalt of the present invention can be prepared at the construction field (site), and technology is simple, and is easy to operate, is easy to the workmen and grasps.

3, the composite modified asphalt of producing by the present invention, portion forms " network-disperse " structure within it, has obviously improved bituminous high-temperature behavior and low-temperature performance, ageing resistance (performance and result of use see table 1 for details, 2), and viscosity is little under high-temperature service, good fluidity is easy to construction.

4, because the present invention is that to adopt the pitch of homemade intermediate base or paraffinic crude production be raw material, through composite modified and make, cost is low, and low price not only can replenish the deficiency of homemade heavy traffic asphaltum quantity, and can be country and save a large amount of foreign exchanges.Therefore, has tangible economic and social benefit.

5, the SBS modifying asphalt mother liquor of making among the present invention, carbon black disperse means are can long-term storage standby, need not frequent making.

Accompanying drawing is a process flow sheet of the present invention.

Embodiment 1, composite modified asphalt are made.

At first come swelling SBS, make it consistency preferably be arranged with pitch with the swelling conditioning agent.The ratio of SBS and swelling conditioning agent is 1: 0.5 weight ratio swelling under 25 ℃ temperature, and swelling made swelling SBS in 24 hours.Meanwhile, spray cloth equably on carbon black with the swelling conditioning agent, make its surface wettability, react and mix thoroughly after 12 hours, the carbon black disperse means that become loose shape are with standby.

Triumph 100# pitch is hot melt to 130 ℃, is added in the stirrer, the SBS that swelling is good is by the good SBS of swelling: 1: 5 weight ratio of pitch is added in the pitch, is stirred to evenly, and at this moment SBS and pitch are together compatible well, become SBS modifying asphalt mother liquor.

At last, SBS modifying asphalt mother liquor and carbon black disperse means are delivered in the pitch by the proportioning pump of 5% weight percent of pitch weight respectively, be composite modified asphalt after fully stirring.

The making of embodiment 2, composite modified asphalt mixture.

By SBS: the swelling conditioning agent is 1: 2 weight ratio, and swelling SBS under 22 ℃ of temperature, swelling time are 24 hours, simultaneously to carbon black swelling conditioning agent, evenly sprays cloth on carbon black, react mix after 24 hours all become loose shape the carbon black disperse means with standby.

The good SBS of swelling by the good SBS of swelling: 1: 7 weight ratio of pitch is added in the pitch behind the thermosol, is stirred to evenly, becomes SBS modifying asphalt mother liquor, with standby.

Is SBS modifying asphalt mother liquor and carbon black disperse means that 3% weight percent of pitch weight and the ratio of 2% weight percent that carbon black is pitch weight add in the pitch in SBS respectively, is composite modified asphalt after fully stirring, and it is standby to put into pitch storage pond.

Become composite modified asphalt mixture after ratio and rubble, sand, breeze (all kinds of mineral powder, as rhombspar, Wingdale etc.) mix and stir routinely the composite modified asphalt that performs at last, get final product surfacing.

Claims

1, a kind of manufacture method of composite modified asphalt, (1) earlier with the swelling conditioning agent by styrene-butadiene copolymer: the swelling conditioning agent is 1: the 0.5-2.0 weight ratio, styrene-butadiene copolymer is carried out swelling to be regulated, under 20-25 ℃ of temperature swelling 24-72 hour, then by the styrene-butadiene copolymer after the swelling: pitch is 1: the 5-7 weight ratio is added in the pitch, stir, become styrene-butadiene copolymer modifying asphalt mother liquor; (2) evenly spray cloth carbon blacksurface afterreaction 12-14 hour with the swelling conditioning agent, mix the carbon black disperse means of the shape that becomes to loosen then thoroughly, styrene-butadiene copolymer modifying asphalt mother liquor, the carbon black disperse means are that the 3-5% weight percent of pitch weight and 2-5% weight percent that carbon black is pitch weight are spiked in the pitch and go by styrene-butadiene copolymer respectively, are composite modified asphalt after fully stirring.

2, the manufacture method of composite modified asphalt according to claim 1 is characterized in that, described its aromatic index of swelling conditioning agent is f _a=0.200-0.400.