CN103834185A - Polyurethane/nano-composite modified asphalt and preparation method thereof - Google Patents

Abstract

The invention provides polyurethane/nano-composite modified asphalt. The polyurethane/nano-composite modified asphalt comprises the following components in percentage by mass: 2%-15% of polyurethane, 0.1%-5% of graphene oxide and 80%-97.9% of matrix asphalt, wherein the sum of the mass percentage of the components is 100%. A preparation method of the polyurethane/nano-composite modified asphalt comprises the following steps: heating and melting the matrix asphalt, maintaining temperature at 150-200 DEG C, adding the polyurethane and the graphene oxide, manually mixing for 20-40 minutes, then stirring for 80-100 minutes by using a shearing machine, cooling to 100-150 DEG C, standing for 20-50 minutes, and shearing an asphalt mixture by using the shearing machine again for 80-100 minutes till the polyurethane and the graphene oxide are uniformly dispersed in the asphalt, thus obtaining the polyurethane/nano-composite modified asphalt. The preparation method has the advantages that the polyurethane and the graphene oxide are used as modifying agents, a two-step method modification technology is adopted so as to give full play to good performances of the polymer and nanometer materials, and the high-temperature performance and anti-modification capacity of the matrix asphalt and the anti-rutting capacity of asphalt pavements are obviously improved.

Description

A kind of polyurethane/nano composite modified asphalt and preparation method thereof

Technical field

The invention belongs to building material technical field, be specifically related to a kind of polyurethane/nano composite modified asphalt, the invention still further relates to the preparation method of this polyurethane/nano composite modified asphalt.

Background technology

Along with high-grade road traffic amount increases, high, the axle of the speed of a motor vehicle carries increasingly heavy-duty and the performance shortcomings such as domestic plain asphalt wax content is high, cohesive force is poor, extensibility is low, temperature sensitivity is large, causes high grade highway pavement to form various serious diseases.

Facts have proved, polymer modified asphalt can obviously reduce temperature sensitivity, improves the pavement performance of pitch, extends the use properties on road surface.In order to improve the temperature sensibility of pitch, conventionally add the polymers such as rubber, resin, thermoplastic elastomer, as styrene-butadiene rubber(SBR) (SBR), polyethylene (PE), styrene-butadiene-styrene block copolymer (SBS).These high molecular adding, greatly improve the temperature sensibility of pitch, widen the application of temperature interval of pitch, but the resene properties-correcting agent such as PE can only improve the resistance to elevated temperatures of pitch conventionally, and need high shear grinding equipment just can make it dispersed, modifying asphalt poor stability, easily segregation, manufacturing expense is high; The rubber-like asphalt modifiers such as SBR mainly improve the resistance to low temperature of pitch, less to the resistance to elevated temperatures effect of modifying asphalt; Although SBS analog thermoplastic elastomer can improve the high temperature performance of pitch simultaneously, need high shear grinding equipment, manufacturing expense is high, uses inconvenience.

In actual production, get more and more and prepare modifying asphalt by composite modified method, relevant document is as follows:

1. China Patent Publication No. CN1422904(application number: 01135212.4, open day: 2003-06-11), this patent utilization road bitumen 90%～98%(wt%), amorphous poly-a alkene (APAO) 1%～6%(wt%) and styrene-butadiene rubber(SBR) (SBR) 1%～4%(wt%), by asphalt heating to 100～200 ℃, add APAO and SBR, under low whipping speed 20～600r/min, mix 0.5～4h, until close very much evenly, make composite modified asphalt.

2. China Patent Publication No. CN103146206A(application number: 201310088129.8, open day: the 2013-06-12) preparation method of disclosed a kind of composite modified asphalt: step 1, by weight percentage, 5～50% SBS powder and 50%～95% rubber powder, add the SBS/ rubber powder blend that obtains solid-state shape in forcing machine; Step 2, by weight percentage, to the styrene-butadiene-styrene that adds 0～5% in 72.5%～90.5% matrix pitch, after utilizing dispersion machine to shear at 130～170 ℃, add 1～20% SBS/ rubber powder blend at 175～185 ℃, to stir, mix 3～5 hours, make composite modified asphalt.

3. Chinese patent publication No. CN1952007(application number: 200510031003.2, open day: 2007-04-25) utilize pitch, SBS, Poly Propylene Wax and linking agent to make a kind of composite modified asphalt material for pavement, wherein SBS is 2.0～10.0%wt, Poly Propylene Wax content is 0.5～6%wt, and content of crosslinking agent is 2～8%wt.

The existing research to modifying asphalt, be all to utilize resin of industry and rubber as properties-correcting agent mostly, but there is certain shortcoming in polymer class properties-correcting agent, asphalt performance is improved to DeGrain comprehensively, and improvement amplitude is limited.

Summary of the invention

The object of this invention is to provide a kind of polyurethane/nano composite modified asphalt, solved industrial copolymer asphalt performance is improved to DeGrain comprehensively, the problem that improvement amplitude is limited.

Another object of the present invention is to provide a kind of preparation method of polyurethane/nano composite modified asphalt.

The technical solution adopted in the present invention is, a kind of polyurethane/nano composite modified asphalt, adopt urethane and graphene oxide, as properties-correcting agent, pitch is carried out to modification, by mass percentage, it consists of: urethane 2%～15%, graphene oxide 0.1%～5% and matrix pitch 80%～97.9%, above constituent mass per-cent sum is 100%.

Another technical scheme of the present invention is, a kind of preparation method of polyurethane/nano composite modified asphalt specifically implements according to following steps:

Step 1, takes respectively urethane 2%～15%, graphene oxide 0.1%～5% and matrix pitch 80%～97.9% by mass percentage, and above constituent mass per-cent sum is 100%;

Step 2, makes it fusing by matrix pitch heating, and keeping temperature is 150～200 ℃, adds urethane and graphene oxide, and after hand mixing 20～40min, shears stirs 80～100min, is cooled to 100～150 ℃, places 20～50min, makes it fully swelling;

Step 3, the asphalt that step 2 is obtained is again sheared 80～100min on shears, until urethane and graphene oxide are dispersed in pitch, obtains polyurethane/nano composite modified asphalt.

The invention has the beneficial effects as follows, polyurethane/nano composite modified asphalt of the present invention, utilize polyurethane PU (polymkeric substance) and graphene oxide GO(nano material) as properties-correcting agent, in conjunction with feature separately, adopt composite modified technological method, by the modified technique of " two step method ", matrix pitch is carried out to modification, give full play of polymkeric substance and nano material premium properties separately, high-temperature behavior, the resistance type ability that can obviously improve matrix pitch, improve asphalt pavement rut resisting ability greatly.

Accompanying drawing explanation

Fig. 1 is that polyurethane/nano composite modified asphalt of the present invention and unmodified pitch penetration degree change comparison diagram;

Fig. 2 is that polyurethane/nano composite modified asphalt of the present invention and unmodified pitch softening point change comparison diagram;

Fig. 3 is that polyurethane/nano composite modified asphalt of the present invention and 5 ℃ of ductilities of unmodified pitch change comparison diagram.

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.

A kind of polyurethane/nano composite modified asphalt of the present invention, adopt urethane and graphene oxide, as properties-correcting agent, pitch is carried out to modification, by mass percentage, it consists of: urethane 2%～15%, graphene oxide 0.1%～5% and matrix pitch 80%～97.9%, above constituent mass per-cent sum is 100%.

The preparation method of above-mentioned polyurethane/nano composite modified asphalt, specifically implements according to following steps:

Step 1, takes respectively urethane 2%～15%, graphene oxide 0.1%～5% and matrix pitch 80%～97.9% by mass percentage, and above constituent mass per-cent sum is 100%;

Step 2, makes it fusing by matrix pitch heating, and keeping temperature is 150～200 ℃, adds urethane and graphene oxide, and after hand mixing 20～40min, shears stirs 80～100min, is cooled to 100～150 ℃, places 20～50min, makes it fully swelling;

Step 3, the asphalt that step 2 is obtained is again sheared 80～100min on shears, until urethane and graphene oxide are dispersed in pitch, obtains polyurethane/nano composite modified asphalt.

Be below the experimental result that adopts single polyurethane PU, single graphene oxide GO and adopt the composite modified asphalt embodiment of technical solution of the present invention, concrete mixing match is as shown in table 1:

Table 1 is tested modified system proportioning used

The penetration degree of modifying asphalt is tested by GB/T0604-2000; Softening temperature is tested by GB/T0606-2000; Ductility is tested by GB/T0605-1993.Specific experiment result is as follows:

Fig. 1 is the variation diagram of softening temperature before and after asphalt modification, can find out, the softening temperature of 1#-6# modifying asphalt is respectively 51.3 ℃, 64.1 ℃, and 60.3 ℃, 65.5 ℃, 61.7 ℃ and 64.8 ℃.That is to say, composite modified after, the softening temperature of pitch obviously improves, its high-temperature behavior be improved significantly.

As seen from Figure 2, all low than before modification of penetration of bitumens after modification, wherein the penetration degree of 4# modifying asphalt is minimum, for 64.5(0.1mm), 3# is the highest, is 84.0(0.1mm), but with respect to the unmodified pitch of 1#, its penetration degree all decreases, and 4#～6# is particularly remarkable, shows that composite modified rear asphalt non-deformability is improved.

Fig. 3 is pitch extensibility variation diagrams before and after modification, and result shows, composite modified after, 5 ℃ of ductilities of pitch are significantly improved, and that is to say the composite modified low temperature cracking resistance energy that has improved matrix pitch.

Conclusion:

1, urethane, graphene oxide composite modified after, the high-temperature behavior of matrix pitch has obtained obvious improvement, non-deformability obviously improves.

2, the impact of the non-deformability of polyurethane content on modifying asphalt and high-temperature behavior is larger, and non-deformability and the high-temperature behavior impact of graphene oxide content on modifying asphalt is relatively little, but both blend modified asphalts combine the performance characteristics of two kinds of properties-correcting agent, its over-all properties is better.

In sum, the modifying asphalt that utilizes the technology of the present invention to prepare, using urethane, graphene oxide as properties-correcting agent, adopt composite modified technological method, give full play of polymkeric substance and nano material premium properties separately, high-temperature behavior, the resistance type ability that can obviously improve matrix pitch, improve asphalt pavement rut resisting ability greatly.

Embodiment 1

Get the matrix pitch heat fused of mass percent 80%, maintain the temperature at 180 ℃, add by mass percentage 15% urethane and 5% graphene oxide, hand mixing 20min, shears stirs 100min, is cooled to 100 ℃, place 20min, make it fully swelling; Compound is again sheared on shears to 100min, until urethane and graphene oxide are dispersed in pitch, to be obtained final product.

The softening temperature that records the polyurethane/nano composite modified asphalt that embodiment 1 obtains is 67.3 ℃, and penetration degree is 69.3(0.1mm), ductility is 69cm.

Embodiment 2

Get the matrix pitch heat fused of mass percent 97.9%, maintain the temperature at 150 ℃, add by mass percentage 2% urethane and 0.1% graphene oxide, hand mixing 40min, shears stirs 80min, is cooled to 150 ℃, place 50min, make it fully swelling; Compound is again sheared on shears to 80min, until urethane and graphene oxide are dispersed in pitch, to be obtained final product.

The softening temperature that records the polyurethane/nano composite modified asphalt that embodiment 2 obtains is 63.2 ℃, and penetration degree is 68.7(0.1mm), ductility is 73cm.

Embodiment 3

Get the matrix pitch heat fused of mass percent 93.5%, maintain the temperature at 200 ℃, add by mass percentage 6% urethane and 0.5% graphene oxide, hand mixing 30min, shears stirs 90min, is cooled to 120 ℃, place 30min, make it fully swelling; Compound is again sheared on shears to 90min, until urethane and graphene oxide are dispersed in pitch, to be obtained final product.

The softening temperature that records the polyurethane/nano composite modified asphalt that embodiment 3 obtains is 65.5 ℃, and penetration degree is 64.5(0.1mm), ductility is 81cm.

Claims (2)

1. a polyurethane/nano composite modified asphalt, it is characterized in that, adopt urethane and graphene oxide, as properties-correcting agent, pitch is carried out to modification, by mass percentage, it consists of: urethane 2%～15%, graphene oxide 0.1%～5% and matrix pitch 80%～97.9%, above constituent mass per-cent sum is 100%.

2. a preparation method for polyurethane/nano composite modified asphalt, is characterized in that, specifically implements according to following steps:

Step 1, takes respectively urethane 2%～15%, graphene oxide 0.1%～5% and matrix pitch 80%～97.9% by mass percentage, and above constituent mass per-cent sum is 100%;

Step 2, makes it fusing by matrix pitch heating, and keeping temperature is 150～200 ℃, adds urethane and graphene oxide, and after hand mixing 20～40min, shears stirs 80～100min, is cooled to 100～150 ℃, places 20～50min, makes it fully swelling;

Step 3, the asphalt that step 2 is obtained is again sheared 80～100min on shears, until urethane and graphene oxide are dispersed in pitch, obtains polyurethane/nano composite modified asphalt.

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