CN109880389A - A kind of high temperature anti-rutting modified asphalt and preparation method thereof - Google Patents
A kind of high temperature anti-rutting modified asphalt and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of high temperature anti-rutting modified asphalts and preparation method thereof, there is the modified pitch of decalescence effect using two kinds of crystalline polymer preparations, specifically include the raw material of following parts by weight: 65 ~ 100 parts of matrix pitch, 0 ~ 10 part of polyethylene, 0 ~ 10 part of polyethylene glycol, the polyethylene and polyethylene glycol cannot be zero simultaneously.Wherein, polyethylene glycol and polyethylene are phase-change material simultaneously, modified asphalt material crystallization-amorphous phase-change endothermic character is assigned, the controllable adjustment of modified pitch phase transformation window temperature is realized by changing the relative amount of polyethylene and polyethylene glycol, reduces the high temperature sensitivity of pitch；Polyethylene is framework material, prevents material from macroscopic deformation occurs when undergoing phase transformation, significantly improves its high temperature rutting resistance and rheological stability, and effectively extends the service life of bituminous pavement.Preparation method of the present invention is simple and easy to control, and raw material is simple and easy to get, easy to industrialized production, has a good application prospect.
Description
Technical field
The invention belongs to road engineering material preparation technical fields, and in particular to a kind of high temperature anti-rutting modified asphalt and its
Preparation method.
Background technique
By to the end of the year 2018, China's highway mileage has broken through 140,000 kilometers, world rankings first.Bituminous pavement exists
Proportion is up to 90% or more in express highway pavement.As a kind of viscoelastic material of temperature sensitivity, pitch is in high temperature
Lower viscosity is larger, is easily permanently deformed when bearing compared with big load.Continuous high temperature caused by global warming, channelizing
The appearance of traffic, the continuous large longitudinal slope of mountainous area highway slow down running speed, the load action time extends, and cause many
Bituminous pavement after being open to traffic soon there have been track, gather around the problems such as packet, crack and roadbed subsidence.Wherein, the increasing of heavy vehicle
More and overload of vehicle is formed by solid axle and carries causes track disease to highlight the most with high wheel load, and becoming influences bituminous pavement usability
It can most important problem.Thickness of bituminous surface reduces at track wheelmark, and surface layer and the overall structural strength on road surface is caused to reduce,
Weaken road passage capability and service life, causes the increase of maintenance cost.In addition, rainy day ponding be easy to cause high speed at track
The vehicle of traveling drifts about, and it is out of control to also result in Vehicular turn under serious conditions, buries for traffic accident serious hidden
Suffer from.Therefore, it improves rutting resistance and high-temperature stability is all one of the research hotspot of asphalt pavement material all the time.
In view of the above-mentioned problems, road worker has carried out a series of research work, such as patent of invention both at home and abroad
CN201510872175.6 discloses a kind of modified pitch and preparation method thereof based on graphene anti-rut agent, by matrix pitch
And account for the weight percent of the matrix pitch and be made of 1%~7% graphene anti-rut agent, wherein due to the interface of graphene
Effect, so that matrix pitch and anti-rut agent effective component form rock-steady structure.Patent of invention CN201510319071.2 is disclosed
A kind of modified coal tar pitch and preparation method thereof, the carbon pole and TiB used for aluminium electrolysis prepared using this modified coal pitch2/ C is compound
Cathode material, bulk density, compression strength, bending strength, inoxidizability, anti-electrolysis expansion character are significantly improved.Hair
Bright patent CN201811252923.0 discloses a kind of composite modified anti-rut agent, and the composite modified anti-rut agent includes as follows
Component: the mass fraction of recycled thermoplastic polymer is 40~70%, and the mass fraction of regnerated rubber powder is 10~30%, inorganic
The mass fraction of filler material is 5~15%, and the mass fraction of coupling agent is 1~5%, and the mass fraction of cosolvent is 2~8%,
The mass fraction of lignin fibre is 1~5%, significantly improves the high and low temperature performance of asphalt.But the above method is logical
Addition high-modulus substance is crossed to improve the performance of the Rut resistance of pitch, improves the ambient air temperature faced during pavement usage and becomes
Change, solves the ambient air temperature variation issue faced during pavement usage under regular period, different zones, different condition, but
Bituminous pavement still has high temperature, therefore bituminous pavement disease relevant to temperature is still very serious.So being badly in need of exploring new skill
Art measure can actively improve the temperature regime of bituminous pavement, it is made to be capable of being maintained at for long period under the influence of ambient air temperature
In the good reasonable temperature section of performance of asphalt mixture.
The previous research in relation to poly ethyldiol modified pitch is to carry out composite shape-setting by method chemically or physically, makes it
Morphological stability macroscopically is able to maintain after before phase change.Chemical method modified poly (ethylene glycol) is usually to be made using cross-linking reaction
Three-dimensional net structure is formed between polyethylene glycol and pitch, improves modulus and viscosity of asphalt material etc., but this method may
The crystallinity of polyethylene glycol can be reduced, reduce enthalpy of phase change, to weaken its decalescence effect.Physical modification rule mainly utilizes
Inorganic filler such as silica, carbon nanotube, expanded graphite etc. is blended with polyethylene glycol, and peg molecule chain is limited
In the nanostructure of inorganic filler, to prevent polyethylene glycol that macroscopic deformation occurs in phase transition process.But inorganic filler has
There is feature resistant to high temperature, (160~190 DEG C) still behave as rigid solid under the modification temperature of hot asphalt, are not easy dripping
It is uniformly dispersed in blueness, once there is big aggregate, damages the macro property of modified pitch instead.
Summary of the invention
In view of the above shortcomings of the prior art, the object of the present invention is to provide a kind of modified drips of high temperature Rut resistance
Blueness and preparation method thereof solves the problem of that existing asphalt material is easy tacky easily formation track at high temperature, and the present invention assigns
Asphalt material decalescence characteristic, so that Modified Bitumen Pavement is when ambient temperature increases, it is non-that crystallization-occurs for polymer
Crystal phase, which becomes, absorbs a large amount of heat, reduces the high temperature sensitivity of pitch, effectively improves its high temperature rutting resistance and rheology is steady
It is qualitative.
To achieve the above object, the present invention uses following scheme: a kind of high temperature anti-rutting modified asphalt, including following weight
The raw material of number: 65~100 parts of matrix pitch, 0~10 part of polyethylene, 0~10 part of polyethylene glycol；The polyethylene and poly- second two
The parts by weight of alcohol cannot be 0 simultaneously.
It is close with road surface actual temperature since polyethylene glycol fusing point is within the scope of 30~70 DEG C, and melting enthalpy > 120J/g,
When its additive amount in pitch is more than certain value, under hot environment, crystallization-amorphous (solid-liquid) phase transformation occurs for polyethylene glycol
It can absorb a large amount of amount of heat in the process, reduces pavement temperature, serves as phase-change material；Polyethylene fusing point at 110~140 DEG C,
It is always crystalline state under pavement temperature, i.e., strand is in ordered arrangement, when polyethylene glycol undergoes phase transition heat absorption, strand
Movement will be limited by the regular arrangement of polyethylene molecular chain, to prevent entire asphalt material from flow deformation occurs, that is, be served as
Skeletal support material.In addition, the locomitivity of polyethylene molecular chain can be improved in the addition of polyethylene glycol, rising for polyethylene is reduced
Beginning melting temperature simultaneously widens its melt temperature scope, therefore polyethylene also has phase transformation suction while serving as skeletal support material
Fuel factor.
Since polyethylene glycol fusing point itself and viscosity are lower, dispersion is easy in pitch；The fusing point of polyethylene is also obvious low
It is in viscous state when heat mixes modified, while the polyethylene glycol of low melting point plays dystectic polyethylene in the modification temperature of pitch
" plasticising " effect, further promote dispersion of the polyethylene in pitch.Even if therefore in no expanding material, stabilizer and thinner
Under equal promoter effects, both polymer remain to be evenly distributed in pitch, without agglomeration.
Preferably, the high temperature anti-rutting modified asphalt includes the raw material of following parts by weight: matrix pitch 65~100
Part, 2~10 parts of polyethylene, 2~10 parts of polyethylene glycol.
Since polyethylene itself has hydrophobicity, there is no special interaction, and polyethylene mould itself between pitch
Amount and viscosity are higher, and melting temperature is relatively high, if therefore additive amount it is excessive, will be not easy point in the process mixed with pitch
It dissipates uniform；If cannot then play the shaping effect to modified asphalt material conversely, the additive amount of polyethylene is very few.Poly- second two
The additive amount of alcohol is very few, then the decalescence effect of modified asphalt material is poor, cannot achieve high temperature Rut resistance and rheology is steady
It is qualitative；Liquid polyethylene glycol meeting when polyethylene glycol additive amount is excessive, although a large amount of amount of heat can be absorbed, after phase transformation
It is overflowed from asphalt material, causes material that flow deformation occurs.Polyethylene glycol cooperates with compatibility that can obviously drop with the mutual of polyethylene
The high temperature sensitivity of low pitch effectively improves its high temperature rutting resistance and rheological stability.
Preferably, the modified pitch further includes the raw material of following parts by weight: 0~10 part of expanding material, stabilizer 0~
10 parts and 0~10 part of thinner.Preferably, the expanding material is maleic anhydride or aromatic naphtha；The stabilizer be sulphur,
Butyl rubber, ethylene propylene diene rubber, nitrile rubber or butadiene rubber；The thinner is polyethylene wax, polypropylene wax or tristearin
Sour amide.Preferably, 210 DEG C of the arene content > 80% of the aromatic naphtha, flash point requirements >.
In this way, being used cooperatively the high-temperature stability that can further improve pitch with stabilizer；Energy is used cooperatively with thinner
Asphalt viscosity is reduced, bitumen ductility is increased, polymer is promoted to be evenly distributed in pitch；It is poly- with the use of that can promote with expanding material
It closes and merges one between object, and then obtain stable blend.Keep pitch with good stability under the high temperature conditions.
Preferably, the polyethylene is high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene or crosslinking
Polyethylene；The molecular weight ranges of the polyethylene are 104~105G/mol, the melt flow rate (MFR) > 0.4g/ at 190 DEG C
10min。
Preferably, it is 800~8000 that the polyethylene glycol, which is molecular weight,.
Preferably, the matrix pitch is 70# or 90# matrix pitch.
The preparation method of above-mentioned high temperature anti-rutting modified asphalt, comprising the following steps:
1) matrix pitch 100~130 DEG C are heated to soften；
2) polyethylene glycol and polyethylene are added in matrix pitch and obtain mixture, after being heated to 160~190 DEG C, opened
It opens constant temperature to stir at low speed, mixing speed is 500~1000rpm, and mixing time is 30~60min；
3) at the same temperature, further to mixture described in step 2) carry out high speed shear, shearing rotating speed be 5000~
20000rpm, shear time be 2~3h to get arrive the high temperature anti-rutting modified asphalt.
Compared with prior art, the invention has the following beneficial effects:
1, in high temperature anti-rutting modified asphalt prepared by the present invention, matrix pitch is as matrix, polyethylene glycol and polyethylene
Simultaneously it is phase-change material, assigns modified asphalt material crystallization-amorphous phase-change endothermic character, by changes polyethylene and polyethylene glycol
Relative amount realize the controllable adjustment of modified pitch phase transformation window temperature, reduce the high temperature sensitivity of pitch, expired
Full border bituminous pavement uses the modified pitch of temperature；Polyethylene is framework material, prevents material from occurring when undergoing phase transformation macro
Deformation is seen, its high temperature rutting resistance and rheological stability are significantly improved, and effectively extends the service life of bituminous pavement.From root
Solve on this existing asphalt material be easy at high temperature it is tacky, easily formation track the problem of.
2, the present invention using crystallize/crystalline polymer blend be used as pitch composite modifier, by stir at low speed and height
High temperature anti-rutting modified asphalt is prepared in speed shearing, and ingredient is simple, cheap and easy to get, and no auxiliary agent addition reduces cost, modified drip
Green good dispersion, soilless sticking, preparation method is simple and easy to control, easy to industrialized production, has a good application prospect.
Detailed description of the invention
Fig. 1 is complex modulus-temperature curve of the decalescence pitch of Examples 1 to 4 preparation.
Fig. 2 is Rutting parameter-temperature curve of the decalescence pitch of Examples 1 to 4 preparation.
Fig. 3 is the DSC curve of the decalescence pitch of Examples 1 to 3 preparation.
Specific embodiment
Invention is further described in detail combined with specific embodiments below.
One, a kind of high temperature anti-rutting modified asphalt and preparation method thereof
Embodiment 1
A kind of high temperature anti-rutting modified asphalt, is made of the raw material of following parts by weight: 100 parts of 70# matrix pitch, polyethylene
(HDPE) 10 parts, 0 part of polyethylene glycol (PEG-800).Wherein, the molecular weight ranges of polyethylene are 104~105G/mol, at 190 DEG C
Melt flow rate (MFR) > 0.4g/10min.
The preparation method of the high temperature anti-rutting modified asphalt, comprising the following steps:
(1) 70# matrix pitch 100 DEG C are heated to soften；
(2) polyethylene is added in 70# matrix pitch and obtains mixture, after being heated to 180 DEG C, opened constant temperature low speed and stir
It mixes, mixing speed 500rpm, mixing time 30min；
(3) at the same temperature, the step 2) mixture is further subjected to high speed shear, shearing rotating speed is
5000rpm, shear time be 2h to get arrive the high temperature anti-rutting modified asphalt.
Embodiment 2
A kind of high temperature anti-rutting modified asphalt, is made of the raw material of following parts by weight: 100 parts of 90# matrix pitch, polyethylene
(HDPE) 10 parts, 5 parts of polyethylene glycol (PEG-800).Wherein, the molecular weight ranges of polyethylene are 104~105G/mol, at 190 DEG C
Melt flow rate (MFR) > 0.4g/10min.
The preparation method of the high temperature anti-rutting modified asphalt, comprising the following steps:
(1) 90# matrix pitch 100 DEG C are heated to soften；
(2) polyethylene glycol and polyethylene are added in 90# matrix pitch, after being heated to 180 DEG C, open constant temperature low speed and stir
It mixes, mixing speed 500rpm, mixing time 30min；
(3) at identical temperature, high speed shear, shearing rotating speed 5000rpm further are carried out to pitch, shear time is
2h to get arrive the high temperature anti-rutting modified asphalt.
Embodiment 3
A kind of high temperature anti-rutting modified asphalt, is made of the raw material of following parts by weight: 100 parts of 70# matrix pitch, polyethylene
(HDPE) 10 parts, 10 parts of polyethylene glycol (PEG-800).Wherein, the molecular weight ranges of polyethylene are 104~105G/mol, 190 DEG C
Under melt flow rate (MFR) > 0.4g/10min.
The preparation method of above-mentioned high temperature anti-rutting modified asphalt, comprising the following steps:
(1) 70# matrix pitch 100 DEG C are heated to soften；
(2) polyethylene glycol and polyethylene are added in 70# matrix pitch and obtain mixture, after being heated to 180 DEG C, opened
Constant temperature stirs at low speed, mixing speed 500rpm, mixing time 30min；
(3) at the same temperature, high speed shear further is carried out to mixture described in step 2), shearing rotating speed is
5000rpm, shear time be 2h to get arrive the high temperature anti-rutting modified asphalt.
Embodiment 4
A kind of high temperature anti-rutting modified asphalt, is made of the raw material of following parts by weight: 100 parts of 70# matrix pitch, polyethylene
(HDPE) 10 parts, 10 parts of polyethylene glycol (PEG-2000).Wherein, the molecular weight ranges of polyethylene are 104~105G/mol, 190 DEG C
Under melt flow rate (MFR) > 0.4g/10min.
The preparation method of the high temperature anti-rutting modified asphalt, comprising the following steps:
(1) 70# matrix pitch 100 DEG C are heated to soften；
(2) polyethylene glycol and polyethylene are added in 70# matrix pitch and obtain mixture, after being heated to 180 DEG C, opened
Constant temperature stirs at low speed, mixing speed 500rpm, mixing time 30min；
(3) at the same temperature, high speed shear further is carried out to mixture described in step 2), shearing rotating speed is
5000rpm, shear time be 2h to get arrive the high temperature anti-rutting modified asphalt.
Embodiment 5
A kind of high temperature anti-rutting modified asphalt, is made of the raw material of following parts by weight: 65 parts of 70# matrix pitch, crosslinking are poly-
2 parts of ethylene, 2 parts of polyethylene glycol (PEG-8000).Wherein, the molecular weight ranges of crosslinked polyethylene are 104~105G/mol, 190 DEG C
Under melt flow rate (MFR) > 0.4g/10min.
The preparation method of the high temperature anti-rutting modified asphalt, comprising the following steps:
(1) 70# matrix pitch 100 DEG C are heated to soften；
(2) polyethylene glycol and polyethylene are added in 70# matrix pitch and obtain mixture, after being heated to 180 DEG C, opened
Constant temperature stirs at low speed, mixing speed 1000rpm, mixing time 30min；
(3) at the same temperature, high speed shear further is carried out to mixture described in step 2), shearing rotating speed is
20000rpm, shear time be 1h to get arrive the high temperature anti-rutting modified asphalt.
Two, performance detection
1, the high temperature anti-rutting modified asphalt of Examples 1 to 4 preparation is subjected to rheology testing, equipment is cut using dynamic
Rheometer (DSR) is cut, the complex modulus for detecting material by heating scan and phase angle are with the raised situation of change of temperature, heating
1 DEG C/min of rate, strain 5%, frequency 10rad/s, 25~130 DEG C of temperature range.As a result as shown in Figs. 1-2.
Under normal conditions, the modulus and viscosity of material will all continue to decline as the temperature rises, this and molecule (chain)
Warm-up movement is more strong related at high temperature.When crystallization-amorphous phase-change temperature that temperature is increased to polyethylene or polyethylene glycol is attached
When close, heat caused by equipment persistently overheating will be mainly used for providing latent heat required for phase transformation occurs, and cause to drive modification
The heat of asphaltene molecule (chain) movement is reduced.At this point, a turnover will occur in rheological parameter variation with temperature curve, when
It then will appear one " platform " when latent heat of phase change is sufficiently large.Stablize as shown in Figure 1, can all occur a rheology in Examples 1 to 4
" platform ".The initial temperature that the rheology of modified pitch stablizes " platform " is gradually decreased with the increase of PEG content, this shows this
Crystallization-amorphous phase-change endothermic effect of the rheological stability and polymer of material is closely related.3 complex modulus highest of embodiment,
The temperature that platform occurs is minimum, and about 50 DEG C or so, this fully meets the bituminous pavement temperature of the summer sweltering heat regional temperature highest moon
Requirement.Embodiment 3 and embodiment 4 are compared it can be found that when PEG add identical content when, PEG-800 ratio
PEG-2000 is more preferable to the modified effect of pitch.
Ordinate in Fig. 2 | G*|/sin δ is Rutting parameter, and SHRP plan definition is worked as | G*When |/sin δ drops to 1kPa pair
The temperature answered is the ceiling temperature (SHRP temperature) that uses of asphalt material, as shown in Fig. 2, the track of embodiment 2 and embodiment 3 because
Son is consistently greater than 1kPa before PE crystal melts completely, this shows in 120 DEG C of hot environments below, modified pitch of the present invention
Still there is excellent anti-rut behavior and rheological stability.
2, the high temperature anti-rutting modified asphalt of Examples 1 to 3 preparation is subjected to heat analysis test, equipment uses differential scanning
Calorimeter (DSC) carries out heating scan test, 10 DEG C/min of heating rate, with this to modified pitch under nitrogen atmosphere protection
Crystallization-amorphous phase-change in modified pitch is observed, correlated results is as shown in Figure 3.
Fig. 3 show embodiment 1, embodiment 2 and embodiment 3 all 120 DEG C nearby there is apparent melting peak, this with
Crystallization-amorphous transition of HDPE is related, and corresponding melting enthalpy is respectively 13J/g, 20J/g and 26J/g.Embodiment 2 is implemented
Example 3 compared with Example 1, in 30 DEG C of neighbouring many places melting peaks of one PEG, but its smaller, about 7~10J/ that melts enthalpy
g.The shortage of heat that so small melting enthalpy absorbs modified pitch is being schemed with causing rheology to stablize the appearance of " platform "
Complex modulus in 1 in embodiment 2 and embodiment 3 near 30 DEG C still declines as the temperature rises.And the reality in Fig. 1
It applies example 3 and nearby begins to occur rheology " platform " at 50 DEG C, melting temperature of this temperature well below HDPE, this shows PEG
Addition can reduce the onset melting temperature of HDPE, this is related with " plasticizing " effect of the PEG to HDPE；In addition, HDPE's is molten
Melt enthalpy increase with the increase of PEG content this result shows that, the addition of PEG can promote the crystallization behavior of HDPE, improve
Its crystallinity causes the modulus of HDPE/PEG modified pitch also to correspondingly increase.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although applicant
It is described the invention in detail referring to preferred embodiment, those skilled in the art should understand that, to of the invention
Technical solution is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered
In scope of the presently claimed invention.
Claims (7)
1. a kind of high temperature anti-rutting modified asphalt, which is characterized in that the raw material including following parts by weight: matrix pitch 65 ~ 100
Part, 0 ~ 10 part of polyethylene, 0 ~ 10 part of polyethylene glycol；The parts by weight of the polyethylene and polyethylene glycol cannot be 0 simultaneously.
2. high temperature anti-rutting modified asphalt according to claim 1, which is characterized in that the polyethylene and polyethylene glycol it is total
Parts by weight are not less than 10.
3. high temperature anti-rutting modified asphalt according to claim 1, which is characterized in that the raw material including following parts by weight:
65 ~ 100 parts of matrix pitch, 2 ~ 10 parts of polyethylene, 2 ~ 10 parts of polyethylene glycol.
4. high temperature anti-rutting modified asphalt according to claim 1, which is characterized in that the polyethylene is high-density polyethylene
Alkene, low density polyethylene (LDPE), linear low density polyethylene or crosslinked polyethylene；The molecular weight ranges of the polyethylene are 104~105g/
Mol, the melt flow rate (MFR) > 0.4g/10min at 190 DEG C.
5. high temperature anti-rutting modified asphalt according to claim 1, which is characterized in that the polyethylene glycol is that molecular weight is
800~8000。
6. high temperature anti-rutting modified asphalt according to claim 1, which is characterized in that the matrix pitch is 70# or 90# base
Matter pitch.
7. such as the preparation method of any one of the claim 1 ~ 3 high temperature anti-rutting modified asphalt, which is characterized in that including following
Step:
1) matrix pitch 100 ~ 130 DEG C are heated to soften；
2) polyethylene glycol and polyethylene are added in matrix pitch and obtain mixture, after being heated to 160 ~ 190 DEG C, open constant temperature
It stirs at low speed, mixing speed is 500 ~ 1000rpm, and mixing time is 30 ~ 60min；
3) at the same temperature, further by mixture described in step 2 carry out high speed shear, shearing rotating speed be 5000 ~
20000rpm, shear time be 2 ~ 3h to get arrive the high temperature anti-rutting modified asphalt.
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| CN110044773A (en) * | 2019-04-16 | 2019-07-23 | 长沙理工大学 | A kind of modified pitch high-temperature behavior evaluation method |
| CN112795071A (en) * | 2021-01-14 | 2021-05-14 | 四川大学 | Method for preparing regenerated product by using waste crosslinked polyethylene and asphalt |
| CN115321883A (en) * | 2022-08-29 | 2022-11-11 | 聊城市交通发展有限公司 | Steel slag SMA asphalt concrete and intersection rut rapid disposal structure |
| CN116285687A (en) * | 2023-03-15 | 2023-06-23 | 北京工业大学 | Phase-change fog seal material containing phase-change material, and preparation method and application thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112795071A (en) * | 2021-01-14 | 2021-05-14 | 四川大学 | Method for preparing regenerated product by using waste crosslinked polyethylene and asphalt |
| CN112795071B (en) * | 2021-01-14 | 2021-09-10 | 四川大学 | Method for preparing regenerated product by using waste crosslinked polyethylene and asphalt |
| CN115321883A (en) * | 2022-08-29 | 2022-11-11 | 聊城市交通发展有限公司 | Steel slag SMA asphalt concrete and intersection rut rapid disposal structure |
| CN116285687A (en) * | 2023-03-15 | 2023-06-23 | 北京工业大学 | Phase-change fog seal material containing phase-change material, and preparation method and application thereof |
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| Publication number | Publication date |
|---|---|
| CN109880389B (en) | 2021-08-17 |
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