CN104177845A - Styrene-butadiene-styrene block copolymer (SBS)-modified asphalt and preparation method thereof - Google Patents

Abstract

The invention provides styrene-butadiene-styrene block copolymer (SBS)-modified asphalt and a preparation method thereof. The SBS-modified asphalt comprises matrix asphalt and additives. The additives comprise a SBS modifier and a stabilizing agent. The matrix asphalt is obtained by straight distillation of Merey oil and Boscan oil, wherein a weight ratio of Merey oil to Boscan oil is 100: 0, 90: 10, 85: 15, 75: 25 or 50: 50. The SBS-modified asphalt has a softening point higher than 75DEG C and good storage stability.

Description

SBS modifying asphalt and preparation method thereof

Technical field

The present invention relates to modified asphalt technology field, especially SBS modifying asphalt and preparation method thereof for road.

Background technology

The modification of pitch is a kind of physical blending process, and modifier polymer adds after pitch, forms elastic grid structure by swelling with being adsorbed in pitch.This grid structure has desirable elasticity, plasticity and extensibility, and the performance of pitch is comprehensively promoted.And being applied to asphalt modification, styrene-butadiene-styrene block copolymer (SBS) there is ripe application.The structure of SBS properties-correcting agent, SBS properties-correcting agent is divided into two kinds of linear and stars.

The modified effect of pitch and the chemical constitution of matrix pitch are closely related, will select different process for formulating schemes for different matrix pitches, the structure of properties-correcting agent and kind and the production technique etc. of stablizer are all the important factors that affects performance of modified bitumen simultaneously.

In more existing embodiments, adopting weight fraction is star-shaped sbs 2%-6%, this property pitch of sulphur 0.08-0.2% and nano-calcium carbonate 2-10%.Although use nano-calcium carbonate can dilute SULPHUR POWDER, play the effect that improves modifying asphalt softening point temperature, researchist states in process in realization, at least finds that the softening point temperature of this modifying asphalt is too low, is difficult to meet the demand of some objective environments.For example, in some application scenario, just need to lay the modifying asphalt of 75 DEG C of softening temperatures.

Summary of the invention

For the deficiencies in the prior art, the object of the invention is to provide a kind of SBS modifying asphalt and preparation method thereof, and the softening temperature of producing modifying asphalt to solve the straight run of the auspicious oil of existing agate and Persian bank oil is less than the technological deficiency of 75 DEG C or aging decay.

In order to reach object of the present invention, the present invention realizes by the following technical solutions:

The embodiment of the present invention provides a kind of SBS modifying asphalt, comprise matrix pitch and additive, in described additive, comprise SBS properties-correcting agent and stablizer, described matrix pitch is by the auspicious oil of agate and Persian bank oil straight run gained, wherein, the weight ratio of the auspicious oil of described agate and Persian bank oil is 100:0,90:10,85:15,75:25 or 50:50, and the auspicious oil of agate and the Persian bank oil of different ratios obtain different matrix pitches.Stablizer can improve the stability that matrix pitch is combined with SBS properties-correcting agent and prevent segregation phenomenon.

Because the composition of the consistency of SBS properties-correcting agent and matrix pitch is relevant, matrix pitch composition is different, and modified effect is also different.The increase of pitch studies on asphaltene, be conducive to improve the stress-strain behavior of modifying asphalt, but also have influence on the compatible stability of SBS properties-correcting agent in pitch, and fragrance in pitch divides increase, be conducive to the formation of the compatible stabilising system of SBS-pitch, but too high fragrance divides, softening temperature and the force of cohesion of modifying asphalt will obviously be reduced.In some embodiments, in described additive, also comprise that weight content is that more than 65% fragrance divides, be conducive to promote the fused of matrix pitch and SBS properties-correcting agent.

Described additive also comprises compatilizer and antiaging agent.

Described compatilizer fragrance point content is more than 65%.

Described SBS properties-correcting agent is styrene-butadiene-styrene block copolymer.Antiaging agent is that petroleum base antioxidant is host, and auxiliary with dispersion agent, the weight content that its addition is matrix pitch is 0.1-0.2%.Antiaging agent can improve modifying asphalt high-temperature aging resisting ability, slows down performance of modified bitumen decay, increases the service life.

The addition of described SBS properties-correcting agent is the weight content 3.5%-6.0% of matrix pitch.

Described stablizer is taking sulphur class linking agent and special modified resene stablizer as main, and adds butylbenzene class crosslinking coagent and inorganic salt.

The addition of described stablizer is the weight content 0.2%-0.3% of matrix pitch.

In addition, the embodiment of the present invention also provides a kind of preparation method of SBS modifying asphalt, comprises the following steps:

1) utilize weight ratio to prepare matrix pitch for 100:0,90:10,85:15,75:25 or the auspicious oil of 50:50 agate and Persian bank oil;

2) add the additive that comprises SBS properties-correcting agent and stablizer, and react under following processing condition:

A, shear temperature are 185 DEG C-190 DEG C;

B, developmental temperature are 180 DEG C～185 DEG C;

C, storing temp are 155 DEG C～160 DEG C.

Technical scheme by the invention described above can be found out, the auspicious oil of agate and the straight run of Persian bank oil obtain matrix pitch, fill up the blank of utilizing Ma-Bo crude oil straight-run pitch to produce high-grade SBS modifying asphalt, the present invention has higher softening temperature under the effect of matrix pitch and additive, and its softening temperature is brought up to more than 75 DEG C.

In addition, SBS modifying asphalt of the present invention also has preferably storage stability.

Embodiment

Exemplify several embodiments below so that the present invention is described in detail, the description of this part is only exemplary and indicative explaination, should not form protection scope of the present invention is produced to any restriction.

Embodiment 1

Batching: SBS modifying asphalt comprises matrix pitch and additive, in described additive, comprise SBS properties-correcting agent and stablizer, matrix pitch is by the auspicious oil of agate and Persian bank oil straight run gained, wherein, the weight ratio of the auspicious oil of described agate and Persian bank oil is 100:0,90:10,85:15,75:25 or 50:50.

Production technique: be that 100:0,90:10,85:15,75:25 or 50:50 distill respectively according to the weight ratio of the auspicious oil of agate and Persian bank oil, obtain matrix pitch.Then add additive to carry out modification, wherein, in additive, comprise 4.5% SBS properties-correcting agent of promising matrix pitch weight and the stablizer that weight content is 0.3%.SBS properties-correcting agent is styrene-butadiene-styrene block copolymer.Finally, by matrix pitch and additive, 185 DEG C of shear temperature, developmental temperature is 180 DEG C, and storing temp is at 155 DEG C, to adopt concentration and dilution method to react to make SBS modifying asphalt.

Styrene-butadiene-styrene block copolymer, has the characteristic of rubber and plastics concurrently, can contact with water, weak acid, alkali etc., has good tensile strength, the characteristic such as skin friction coefficient is large, and low-temperature performance is good, and electrical property is good, good processability.

Feature: 1, available heat thermoplastic plastic processing units carries out machine-shaping, as extruding, injection, blowing etc., shaping speed is faster than traditional vulcanized rubber technique;

2, do not need sulfuration, can save the vulcanization process in the general thermoset rubber course of processing;

3, SBS is joined in petroleum pitch, by the SBS modified bitumen product of the suitable explained hereafter such as heating, shearing, stirring, improve road bitumen product pavement performance, there is the performances such as good low temperature, flexibility, high temperature deformation resistance, extensively use High Grade Bitumen Pavement making and roof waterpoof material.

Stablizer of the present invention produces active radical under certain heat condition, with SBS polymer molecular chain, activity of bitumen functional group, cross-linked graft occurs and reacts.Add after stablizer, make polymer phase in modifying asphalt and matrix pitch form the stable Phase boundary surface adsorption layer of one deck between mutually, reduce the surface tension of phase interface, the avidity between increase two-phase; Make polymkeric substance and pitch form stable colloidal dispersion, thereby improve the thermostability of modifying asphalt, solve the storage segregation problem of modifying asphalt.

In experimentation, research staff finds that concentration and dilution method can effectively improve the overground concentration of SBS properties-correcting agent single, reduces the overground quantity of high temperature matrix pitch and time, is conducive to stabilized product quality, enhances productivity simultaneously.In addition, stablizer adds the generation that is conducive to prevent gelatin phenomenon by solution additive process, can shorten the interpolation time simultaneously.

Reaction unit in reaction process is modified asphalt production device, this device adopts four tanks three to grind, semi-automatic production, production technology characteristic is shear at high temperature, lowers the temperature into change, low-temperature storage, have swelling fully, be evenly distributed, the advantage such as storage, steady quality for a long time.

Embodiment 2

On the basis of embodiment 1, in additive, also comprise compatilizer, compatilizer fragrance point content is more than 65%, the weight content of SBS properties-correcting agent is matrix pitch 4.5%, the 0.2%-0.3% that the weight content of stablizer is matrix pitch.

Production technique: on the basis of embodiment 1,190 DEG C of shear temperature, developmental temperature is 185 DEG C by matrix pitch and additive, and storing temp is to react at 160 DEG C to make SBS modifying asphalt.

The modifying asphalt that above-described embodiment obtains, carry out Performance Detection according to People's Republic of China's industry standard " highway engineering pitch and Asphalt Mixture Experiment code " (JTG F20-2011), meet " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) requirement, main performance index is in table 1.

Salient features and the JTG F40-2004 technological standard of table 1SBS modifying asphalt

Note: in table 1, the technical indicator of SBS modifying asphalt is explained:

1, the index of the denseness of penetration degree inspection pitch;

2, softening temperature refers under certain condition, and pitch reaches the temperature of a certain denseness, and softening temperature is higher shows that high temperature performance of asphalt is better;

3, the low-temperature performance of 5 DEG C of reflection modifying asphalts of ductility, numerical value is the bigger the better;

4, the storage stability of segregation reflection modifying asphalt, the less storage stability of numerical value is better, also shows modified asphalt material homogeneous more.

Learn by table 1, the performance of modifying asphalt of the present invention meets Chinese Highway Asphalt Pavement Construction Technique specification JTG F40-2004 requirement completely, has the softening temperature higher than 75 DEG C.And the present invention also has less segregation, there is preferably storage stability.

Shear temperature is that 185 DEG C-190 DEG C, developmental temperature are that 180 DEG C～185 DEG C, storing temp are 155 DEG C～160 DEG C, and storage stability is better.

The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (10)

1. a SBS modifying asphalt, is characterized in that, comprises matrix pitch and additive, comprises SBS properties-correcting agent and stablizer in described additive, and described matrix pitch is by the auspicious oil of agate and Persian bank oil straight run gained.

2. SBS modifying asphalt as claimed in claim 1, is characterized in that, the weight ratio of the auspicious oil of described agate and Persian bank oil is 100:0,90:10,85:15,75:25 or 50:50.

3. SBS modifying asphalt as claimed in claim 1, is characterized in that, described additive also comprises compatilizer and antiaging agent.

4. SBS modifying asphalt as claimed in claim 3, is characterized in that, described compatilizer fragrance point content is more than 65%.

5. SBS modifying asphalt as claimed in claim 3, is characterized in that, described SBS properties-correcting agent is styrene-butadiene-styrene block copolymer.

6. SBS modifying asphalt as claimed in claim 3, is characterized in that, described antiaging agent is that petroleum base antioxidant is host, and auxiliary with dispersion agent, the weight content that its addition is matrix pitch is 0.1-0.2%.

7. SBS modifying asphalt as claimed in claim 1, is characterized in that, the weight content 3.5%-6.0% that the addition of described SBS properties-correcting agent is matrix pitch.

8. SBS modifying asphalt as claimed in claim 1, is characterized in that, described stablizer is taking sulphur class linking agent and special modified resene stablizer as main, and adds butylbenzene class crosslinking coagent and inorganic salt.

9. SBS modifying asphalt as claimed in claim 1, is characterized in that, the weight content 0.2%-0.3% that the addition of described stablizer is matrix pitch.

10. a preparation method for SBS modifying asphalt, is characterized in that, comprises the following steps:

1) utilize weight ratio to prepare matrix pitch for 100:0,90:10,85:15,75:25 or the auspicious oil of 50:50 agate and Persian bank oil;

2) add the additive that comprises SBS properties-correcting agent and stablizer, and react under following processing condition:

A, shear temperature are 185 DEG C-190 DEG C;

B, developmental temperature are 180 DEG C～185 DEG C;

C, storing temp are 155 DEG C～160 DEG C.