CN1952002A

CN1952002A - Composite modified asphalt for pavement

Info

Publication number: CN1952002A
Application number: CN 200510030698
Authority: CN
Inventors: 黄子章
Original assignee: SHANGHAI QUNKANG ASPHALTUM TECHNOLOGY Co Ltd
Current assignee: SHANGHAI QUNKANG ASPHALTUM TECHNOLOGY Co Ltd
Priority date: 2005-10-20
Filing date: 2005-10-20
Publication date: 2007-04-25

Abstract

The invention discloses a composite modified tar material to build road, which comprises the following parts: tar (100%), 2.0-10.0% SBS, 0.5-6% polypropylene wax and 2-8% crosslinking agent. The invention improves the compatibility of SBS and tar, which reduces 135C viscosity of modified tar to simplify the construction.

Description

A kind of composite modified asphalt for pavement

Technical field

The present invention relates to Road construction and use the composite modified asphalt material field.

Background technology

Add multipolymer and be used for improving bituminous performance existing decades of history.Styrene butadiene triblock copolymer SBS is present the most frequently used a kind of multipolymer that is used to improve asphalt performance.

US4145322 discloses the method for a kind of SBS of preparation (being the styrene butadiene triblock copolymer) modifying asphalt, adds heated bitumen under the temperature of 130-230C, adds SBS, and SBS is the 2%-20% of pitch weight, with sulphur as linking agent.The shortcoming of this technology is that general SBS and bituminous consistency are all relatively poor, if therefore used bitumen compatibility is relatively poor, is difficult to produce qualified modifying asphalt, and the 135C viscosity of modifying asphalt is higher simultaneously, the comparison difficulty of mixing and stirring and pave of road surface compound.

US5371121 discloses a kind of method of the SBS of preparation modifying asphalt, and it only adds the sulphur of 0.015-0.075%.This method is because the sulphur volume is too low, and used SBS volume is very high, and the storage stability of SBS modifying asphalt is also bad.

Summary of the invention

The objective of the invention is to propose a kind ofly can increase SBS and bituminous consistency, improves the high-temperature behavior of modifying asphalt simultaneously, reduces the composite modified asphalt material of the 135C viscosity of modifying asphalt.

The road modified asphalt material that the present invention proposes adopts SBS and polyethylene wax as composite modifier, and concrete technical scheme is as follows:

A kind of composite modified asphalt for pavement is made up of pitch, SBS, polyethylene wax and linking agent, and wherein SBS content is the 2.0%-10.0% of pitch weight, and polyethylene wax content is the 0.5-6% of pitch weight, and content of crosslinking agent is the 2%-8% of SBS weight.

Composite modified asphalt for pavement of the present invention, the content of each component is preferably: SBS content is the 2.5-6.0% of pitch weight, and polyethylene wax content is the 1.0%-4% of pitch weight, and content of crosslinking agent is the 3%-5% of SBS weight.

Composite modified asphalt for pavement of the present invention, its medium pitch are various petroleum pitch.

Composite modified asphalt for pavement of the present invention, wherein SBS is meant the styrene butadiene triblock copolymer, the SBS molecular-weight average is 30,000 to 450,000.

Composite modified asphalt for pavement of the present invention, wherein polyethylene wax is meant molecular-weight average at 500-15000, and softening temperature is at 90-160 ℃ polyethylene wax, and more excellent is molecular-weight average is at 3000-6000, and softening temperature is at 120-150 ℃ polyethylene wax.

Composite modified asphalt for pavement of the present invention, wherein linking agent is a SULPHUR POWDER.

Composite modified asphalt for pavement preparation method of the present invention is as follows: earlier pitch is heated to 130-220 ℃, to mobile fully, then SBS is joined in the pitch, mixed 5-600 minute, polyethylene wax can random time add in above-mentioned whipping process, perhaps adds before SBS adds, and SBS adds linking agent behind the uniform mixing in pitch, stirred 15-720 minute, and promptly got modifying asphalt.The modifying asphalt for preparing can also be continued to place 10-1440 minute at 130-200 ℃, so that its crosslinking reaction is further finished.

Beneficial effect of the present invention: the present invention joins in the mixture of pitch and SBS by using polyethylene wax, to increase SBS and bituminous consistency, also further improve simultaneously the bituminous high-temperature behavior, and the 135C viscosity of reduction modifying asphalt, to reduce the difficulty of construction of modifying asphalt, help construction.

Embodiment

Embodiment 1:

1000g East Sea 90# pitch is placed in one 2 liters the beaker, pitch is heated to 180 ℃, (Thailand polyethylene company limited (TPE) produces with the 35g polyethylene wax then, LP1100P) and 40gSBS (LCY-501, Taiwan Lee Chang Yung Chemical Indust produces) join in the pitch respectively, adopt in the machine,massing in stirring under the 200 commentariess on classics/min conditions after 300 minutes, the SBS that observes in the beaker has solved homogeneously in the pitch, and then the SULPHUR POWDER that slow adding 1.75 restrains in a minute, continue to stir 120 minutes, pitch being put into the baking oven of 163C placed 120 minutes, obtain modifying asphalt, character sees Table 1:

Comparative Examples 1:

1000g East Sea 90# pitch is placed in one 2 liters the beaker, pitch is heated to 180 ℃, then with 40gSBS (LCY-501, Taiwan Lee Chang Yung Chemical Indust produces) join in the pitch, adopt in the machine,massing and under 200 commentaries on classics/min conditions, stirred 300 minutes, the SBS that observes in the beaker still presents thicker particle, continue to stir after 120 minutes, the SBS that observes in the beaker has solved homogeneously in the pitch, and then in one minute, slowly add 1.75 SULPHUR POWDER that restrain, and continue to stir 120 minutes, pitch is put into the baking oven of 163C and placed 120 minutes, obtain modifying asphalt, character sees Table 1:

Table 1

Numbering

Embodiment 1

Comparative Examples 1

Penetration degree, dmm@25 ℃	56	?65
Penetration degree, dmm@25 ℃	56	?65	Softening temperature, ℃ @5 ℃/min	81.5	?61
135C viscosity, Pa.S	0.8	?1.5	Softening temperature, ℃ @5 ℃/min	81.5	?61
135C viscosity, Pa.S	0.8	?1.5	Isolation test, ℃	0.5	?0.5

As can be seen from Table 1, adding the modifying asphalt softening temperature of preparing behind the polyethylene wax spends than the modifying asphalt softening temperature high 20.5 that does not add the polyethylene wax preparation, the high-temperature behavior that shows composite modified asphalt has obtained further raising, and behind the adding polyethylene wax, the 135C viscosity that the 135C viscosity ratio of modifying asphalt does not add polyethylene wax obviously descends, after showing the adding polyethylene wax, the difficulty of construction of modifying asphalt can reduce; Simultaneously also as can be seen according to the course of processing, after adding polyethylene wax, SBS dissolved time in pitch is about 300 minutes, not adding polyethylene wax SBS, to dissolve the needed time in pitch be 420 minutes, can increase SBS and bituminous consistency after showing the adding polyethylene wax, reduce the dissolution time of SBS in pitch, reduce the process period of modifying asphalt.

Adopt the embodiment 1 and the modifying asphalt of Comparative Examples 1 preparation to carry out wheel tracking test respectively, the results are shown in Table 2.

Table 2

	Embodiment 1 modifying asphalt	Comparative Examples 1 modifying asphalt pitch
	Embodiment 1 modifying asphalt	Comparative Examples 1 modifying asphalt pitch	The wheel tracking test dynamic stability, inferior/mm	3513	2350

As can be seen from Table 2, the dynamic stability of the modifying asphalt of moving stabilization ratio Comparative Examples 1 preparation of the modifying asphalt of the present invention's preparation has improved a lot, shows that the modifying asphalt that the present invention prepares has good anti-rut performance, shows that its high-temperature stability has obtained obvious improvement.

Claims

1, a kind of composite modified asphalt for pavement is made up of pitch, SBS, polyethylene wax and linking agent, and wherein SBS content is the 2.0%-10.0% of pitch weight, and polyethylene wax content is the 0.5-6% of pitch weight, and content of crosslinking agent is the 2%-8% of SBS weight.

2, composite modified asphalt for pavement as claimed in claim 1 is characterized in that, SBS content is the 2.5-6.0% of pitch weight.

3, composite modified asphalt for pavement as claimed in claim 1 is characterized in that, polyethylene wax content is the 1.0%-4% of pitch weight.

4, composite modified asphalt for pavement as claimed in claim 1 is characterized in that, content of crosslinking agent is the 3%-5% of SBS weight.

As the described arbitrary composite modified asphalt for pavement of claim 1～4, it is characterized in that 5, SBS is the styrene butadiene triblock copolymer, molecular-weight average is 30,000 to 450,000.

As the described arbitrary composite modified asphalt for pavement of claim 1～4, it is characterized in that 6, the molecular-weight average of polyethylene wax is 500-15000, softening temperature is at 90-160 ℃.

7, arbitrary composite modified asphalt for pavement as claimed in claim 6 is characterized in that, polyethylene wax molecular-weight average be 3000-6000, softening temperature is at 120-150 ℃.

As the described arbitrary composite modified asphalt for pavement of claim 1～4, it is characterized in that 8, linking agent is a SULPHUR POWDER.