CN106866022A - A kind of interior maintaining anti-cracking concrete impervious agent and preparation method thereof - Google Patents
A kind of interior maintaining anti-cracking concrete impervious agent and preparation method thereof Download PDFInfo
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- CN106866022A CN106866022A CN201710173567.2A CN201710173567A CN106866022A CN 106866022 A CN106866022 A CN 106866022A CN 201710173567 A CN201710173567 A CN 201710173567A CN 106866022 A CN106866022 A CN 106866022A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0042—Powdery mixtures
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
The invention discloses a kind of interior maintaining anti-cracking concrete impervious agent and preparation method thereof, wherein, to count by weight, waterproofing and anti-leakage agent raw material includes：30~60 parts of flyash, 10~30 parts of land plaster, 5~50 parts of magnesia, 3~15 parts of phosphoric acid hydrogen two aluminium, 3~15 parts of alum, 0.1~1 part of Sodium Polyacrylate, 0.1~1 part of hydroxypropyl methyl cellulose, 0.1~1 part of methyl silicon sodium alcoholate, 0.1~1 part of sodium gluconate.Waterproofing and anti-leakage agent of the present invention has health environment-friendly, overall cracking resistance is excellent, reduces concrete hydrating temperature rise, impervious effect is significant, enhancing concrete strength, the advantages of improving concrete density, durability, volume stability and excite gelling system activity improvement concrete construction performance.
Description
Technical field
Invention is related to Hydraulic materials technical field, specifically a kind of concrete with interior maintenance action
Waterproofing and anti-leakage agent and its compound method.
Background technology
Concrete is one of contemporary topmost civil engineering material, is widely used in building field industry.But, due to
Itself there is the phenomenon of contraction distortion in concrete (especially mass concrete and high-strength concrete etc.), in use often
The situation of the performances such as concrete cracking, intensity, antiseepage, anti-erosion reduction occurs.Swelling agent is commonly used in the market
Improve the performance of agent on crack resistance of concrete volume deformation as expanding admixture, but using rear concrete still suffer from the heat of hydration it is high,
The phenomenons such as contraction distortion is big, cracking, seepage, and intensity significantly reduces.Meanwhile, domestic various types of concrete compensation are received
Compression material is mostly to carry out high-temperature process using pure raw material, has both caused huge energy resource consumption, and bring to environment
Different degrees of influence, and production high cost, market sale price are expensive.Additionally, though external import product has
Certain waterproofing and anti-leakage performance, but effect is not obvious.Therefore, for concrete construction, especially for large volume coagulation
Soil, the concrete construction (such as Hydropower Dam, military engineering, nuclear power engineering, subway) of high intensity, find a kind of new compensation and receive
Compression material, can solve the problems, such as concrete deformation on the premise of concrete strength is ensured, prevent concrete cracking and seepage, one
The great research topic of person that is directly building technology.
The content of the invention
Concrete hydrating temperature rise can be reduced it is an object of the invention to provide one kind, volume contraction is compensated, is excited gel
System activity and reach improve volume stability, increase density, improve durability the agent of interior maintaining waterproofing and anti-leakage and preparation side
Method.
The technical scheme is that：A kind of interior maintaining anti-cracking concrete impervious agent, counts by weight, its raw material bag
Include：30~60 parts of flyash, 10~50 parts of land plaster, 5~50 parts of magnesia, 3~15 parts of phosphoric acid hydrogen two aluminium, alum 3~
15 parts, 0.1~1 part of Sodium Polyacrylate, 0.1~1 part of hydroxypropyl methyl cellulose, 0.1~1 part of methyl silicon sodium alcoholate, gluconic acid
0.1~1 part of sodium.
Preferably, the interior maintaining anti-cracking concrete impervious agent is counted by weight, and its raw material includes：Flyash 35
Part, 20 parts of land plaster, magnesia 20,8 parts of phosphoric acid hydrogen two aluminium, 6 parts of alum, 0.6 part of Sodium Polyacrylate, hydroxypropyl methyl is fine
0.5 part of dimension element, 0.4 part of methyl silicon sodium alcoholate, 0.5 part of sodium gluconate.
Preferably, flyash loss on ignition≤5%, is counted, wherein SiO with the gross weight of flyash as 100%2Weight hundred
Content is divided to be 30%~60%, Al2O3Weight percentage be 20%~40%.
Preferably, loss on ignition≤5% of the land plaster, is counted with the gross weight of land plaster as 100%, wherein the weight of CaO
Percentage composition is 20%~50%, SO3Weight percentage be 40%~70%.
Preferably, loss on ignition≤5% of the magnesia, purity is 85%~100%.
Preferably, the effective water retention of the Sodium Polyacrylate is more than 90%.
Maintaining anti-cracking concrete impervious agent product specific surface area >=400m in of the invention2/ kg, loss on ignition≤5%.
The invention also discloses a kind of preparation method of interior maintaining anti-cracking concrete impervious agent, comprise the following steps：Press
Formula according to above-mentioned interior maintaining anti-cracking concrete impervious agent weighs each component respectively；By above-mentioned each component add ball mill in,
Ball-milling Time is 15~30min, you can maintaining anti-cracking concrete impervious agent in being obtained.
Maintaining anti-cracking concrete impervious agent can be used as concrete admixture in of the invention, it is preferable that described interior maintenance
Type anti-cracking concrete impervious agent accounts for the 8%~12% of Binder Materials gross weight.
Waterproofing and anti-leakage agent of the present invention has health environment-friendly, and overall cracking resistance is excellent, reduces concrete hydrating temperature rise, impervious
Effect is significant, strengthens concrete strength, improves concrete density, durability, volume stability and excites gelling system to live
Property improve concrete construction performance the advantages of.Concrete density after being improved using waterproofing and anti-leakage agent of the present invention is good without cracking,
Concrete strength and seepage-resistant grade meet design requirement.
Brief description of the drawings
Fig. 1 thermal insulation temperature rise contrast curves；
Fig. 2 ages air shrinkage value contrast curve in 360 days；
Fig. 3 ages expansion strain contrast curve in 90 days；
Fig. 4 anti-cracking index comparison diagrams.
Specific embodiment
A kind of interior maintaining anti-cracking concrete impervious agent, counts by weight, and its raw material includes：30~60 parts of flyash,
10~50 parts of land plaster, 5~50 parts of magnesia, 3~15 parts of phosphoric acid hydrogen two aluminium, 3~15 parts of alum, Sodium Polyacrylate 0.1
~1 part, 0.1~1 part of hydroxypropyl methyl cellulose, 0.1~1 part of methyl silicon sodium alcoholate, 0.1~1 part of sodium gluconate.
In above-mentioned raw materials, magnesia can effectively mitigate the heat of hydration of concrete early stage, reduce contraction distortion, the opposing party
Face, because magnesia has outstanding expansion character, can efficiently extend Bulking Time, adjustment expansion rate, effective compensation
The shrinkage factor of concrete so that concrete shrinks or do not shrink less.Research finds, magnesia is used alone and uses anti-as concrete
Split impervious agent, the late expansion amount of concrete is unstable, be easily caused concrete cracking, and added in magnesia flyash,
Land plaster, can produce synergy between three, have obvious humidification to the raising of concrete anti-compression, tensile property, and
Late expansion amount is constantly in relatively stable state.Preferably, loss on ignition≤5% of the magnesia, purity be 85%~
100%；Preferably, flyash loss on ignition≤5%, is counted, wherein SiO with the gross weight of flyash as 100%2Weight percent
Content is 30%~60%, Al2O3Weight percentage be 20%~40%；Preferably, the loss on ignition of the land plaster≤
5%, counted with the gross weight of land plaster as 100%, wherein the weight percentage of CaO is 20%~50%, SO3Weight percent contain
Measure is 40%~70%.
Phosphoric acid hydrogen two aluminium, alum can react with hydrated product in concrete, and the crystal that production is insoluble in water is filled in
In capillary porosity, waterproof layer is formed, improve concrete impervious ability.In phosphoric acid hydrogen two aluminium, alum aluminium ion can also with it is mixed
Calcium ion, methane-siliconic acid ion form complex network structure in solidifying soil, improve concrete entirety anti-crack ability and flexural capacity,
Alum improves the service behaviour of concrete, improves each age strength, anti-permeability performance, packing of concrete etc..
Sodium Polyacrylate can form insoluble salt with calcium ion in concrete, cause molecule cross-link and gelation is precipitated, and increase
The thickness of big gel waterproof layer, improves concrete durability, additionally, Sodium Polyacrylate can also be played helps film, dispersant and guarantor
The effect of aqua, can promote the mobility of waterproof agent composition strengthens, so as to accelerate the even speed and infiltration speed of mixture
Degree, prevents the space of the uneven generation of impervious agent, and then improve concrete impermeability.Preferably, the Sodium Polyacrylate has
Effect water retention is more than 90%.
Hydroxypropyl methyl cellulose can make sufficiently chemical reaction between impervious agent and concrete, improve concrete
Viscosity, tensile capacity, moreover it is possible to strengthen water holding capacity and cracking resistance of concrete etc..
Methyl silicon sodium alcoholate mixes water repellent component, can form colloid and the combination of many in concrete with reaction by synthesis
Thing is filled in concrete, plugs the capillary porosity in concrete, reduces porosity, improve concrete packing and
Impermeabilisation ability.
Sodium gluconate can strengthen the compression strength of concrete, further improve anti-cracking concrete anti-permeability performance.
Using effectively being combined between optimum proportioning and component, active component carries out advantage to above-mentioned each component in promoting concrete
Complementary and reasonable effectively restructuring, has ensured concrete shrinkage compensation and the growth of intensity, can ensure strong concrete effective
On the basis of degree, waterproofing and anti-leakage performance is improved.
Preferably, the interior maintaining anti-cracking concrete impervious agent is counted by weight, and its raw material includes：Flyash 35
Part, 20 parts of land plaster, 20 parts of magnesia, 8 parts of phosphoric acid hydrogen two aluminium, 6 parts of alum, 0.6 part of Sodium Polyacrylate, hydroxypropyl methyl
0.5 part of cellulose, 0.4 part of methyl silicon sodium alcoholate, 0.5 part of sodium gluconate.
Maintaining anti-cracking concrete impervious agent product specific surface area >=400m in of the invention2/ kg, loss on ignition≤5%.
Maintaining anti-cracking concrete impervious agent can be used as concrete admixture in of the invention, it is preferable that described interior maintenance
Type anti-cracking concrete impervious agent accounts for the 8%~12% of Binder Materials gross weight.
The invention also discloses a kind of preparation method of interior maintaining anti-cracking concrete impervious agent, comprise the following steps：Press
Each component is weighed respectively according to parts by weight；By in above-mentioned each component addition ball mill, Ball-milling Time is 15~30min, you can system
Maintaining anti-cracking concrete impervious agent in obtaining.
Maintaining anti-cracking concrete impervious agent in the present invention is prepared using the above method, after testing, the interior of different formulations is supported
Shield type each performance of anti-cracking concrete impervious agent is identical with the amplitude that Ball-milling Time changes, therefore only enumerates in the following embodiments wherein
A kind of preparation method is used to prepare interior maintaining anti-cracking concrete impervious agent of the invention, and the preparation method is not intended as this hair
The further restriction of bright embodiment.
Technical scheme is clearly and completely described below in conjunction with embodiment, it is clear that described reality
It is only a part of embodiment of the invention to apply example, rather than whole embodiments.Based on the embodiment in the present invention, this area is general
The every other embodiment that logical technical staff is obtained under the premise of creative work is not made, belongs to present invention protection
Scope.
Embodiment 1
A kind of interior maintaining anti-cracking concrete impervious agent, counts by weight, and its raw material includes：35 parts of flyash, gypsum
20 parts of powder, 20 parts of magnesia, 8 parts of phosphoric acid hydrogen two aluminium, 6 parts of alum, 0.6 part of Sodium Polyacrylate, hydroxypropyl methyl cellulose
0.5 part, 0.4 part of methyl silicon sodium alcoholate, 0.5 part of sodium gluconate.The preparation of maintaining anti-cracking concrete impervious agent in the present embodiment
Method, comprises the following steps：Each component is weighed respectively according to parts by weight；By above-mentioned each component add ball mill in, during ball milling
Between be 20min, you can maintaining anti-cracking concrete impervious agent in being obtained.
Embodiment 2
A kind of interior maintaining anti-cracking concrete impervious agent, counts by weight, and its raw material includes：50 parts of flyash, gypsum
29.4 parts of powder, 20 parts of magnesia, 10 parts of phosphoric acid hydrogen two aluminium, 8 parts of alum, 0.6 part of Sodium Polyacrylate, hydroxypropyl methyl fiber
0.8 part of element, 0.7 part of methyl silicon sodium alcoholate, 0.9 part of sodium gluconate.The preparation method of the present embodiment waterproofing and anti-leakage agent and embodiment 1
It is identical.
Embodiment 3
A kind of interior maintaining anti-cracking concrete impervious agent, counts by weight, and its raw material includes：50 parts of flyash, gypsum
25 parts of powder, 44.2 parts of magnesia, 10 parts of phosphoric acid hydrogen two aluminium, 8 parts of alum, 0.8 part of Sodium Polyacrylate, hydroxypropyl methyl fiber
0.6 part of element, 0.3 part of methyl silicon sodium alcoholate, 0.2 part of sodium gluconate.The preparation method of the present embodiment waterproofing and anti-leakage agent and embodiment 1
It is identical.
Embodiment 4
A kind of interior maintaining anti-cracking concrete impervious agent, counts by weight, and its raw material includes：60 parts of flyash, gypsum
10 parts of powder, 20 parts of magnesia, 10 parts of phosphoric acid hydrogen two aluminium, 3 parts of alum, 0.1 part of Sodium Polyacrylate, hydroxypropyl methyl cellulose
0.1 part, 0.1 part of methyl silicon sodium alcoholate, 0.1 part of sodium gluconate.The preparation method of the present embodiment waterproofing and anti-leakage agent and the phase of embodiment 1
Together.
Embodiment 5
A kind of interior maintaining anti-cracking concrete impervious agent, counts by weight, and its raw material includes：30 parts of flyash, gypsum
30 parts of powder, 50 parts of magnesia, 3 parts of phosphoric acid hydrogen two aluminium, 15 parts of alum, 1 part of Sodium Polyacrylate, hydroxypropyl methyl cellulose 1
Part, 1 part of methyl silicon sodium alcoholate, 1 part of sodium gluconate.The preparation method of the present embodiment waterproofing and anti-leakage agent is same as Example 1.
Comparative example 1
A kind of anti-cracking concrete impervious agent, counts by weight, and its raw material includes：35 parts of flyash, 20 parts of land plaster, oxygen
Change 28 parts of magnesium, 6 parts of alum, 0.6 part of Sodium Polyacrylate, 0.5 part of hydroxypropyl methyl cellulose, 0.4 part of methyl silicon sodium alcoholate, Portugal
0.5 part of grape sodium saccharate.
Comparative example 2
A kind of anti-cracking concrete impervious agent, counts by weight, and its raw material includes：35 parts of flyash, 20 parts of land plaster, oxygen
26 parts of magnesium of change, 8 parts of phosphoric acid hydrogen two aluminium, 0.6 part of Sodium Polyacrylate, 0.5 part of hydroxypropyl methyl cellulose, 0.4 part of methyl silicon sodium alcoholate,
0.5 part of sodium gluconate.
Comparative example 3
A kind of anti-cracking concrete impervious agent, counts by weight, and its raw material includes：35 parts of flyash, 20 parts of land plaster, oxygen
Change 20.6 parts of magnesium, 8 parts of phosphoric acid hydrogen two aluminium, 6 parts of alum, 0.5 part of hydroxypropyl methyl cellulose, 0.4 part of methyl silicon sodium alcoholate, Portugal
0.5 part of grape sodium saccharate.
By in the waterproofing and anti-leakage agent incorporation concrete in above-described embodiment and comparative example, volume accounts for Binder Materials gross weight
10%, concrete parts the performance test results are as follows：
The coagulation for mixing maintaining anti-cracking concrete impervious agent in the embodiment of the present invention is can be seen that from above-mentioned test result
Soil nature can be superior to mix the concrete of comparative example.
Comparative example 4
Binder Materials weight is accounted for the waterproofing and anti-leakage agent of the embodiment of the present invention 1, volume is mixed in normal concrete using inner blending method
The 10% of amount, normal concrete as blank control group resists to blank control group and the incorporation embodiment of the present invention 1 anticracking respectively
The performance of the concrete obtained by penetration enhancer is tested and contrasted, wherein age in 28 days absolute temperature rise value, age in 360 days
Air shrinkage value and age the expansion strain comparing result in 90 days see Fig. 1-3.
According to test result, concrete anticracking index is calculated using following equation：
Note：K is anti-cracking index；εpIt is pole pull-up values, RLIt is axial tensile strength；G is from change；α is linear expansion coefficient；T is aquation
Hot temperature rise；εsIt is contract with dry rate.
Blank control group is as shown in Figure 4 with the anti-cracking index contrast of the doping waterproofing and anti-leakage agent concrete of the embodiment of the present invention 1.
Inventor is also carried out the performance that waterproofing and anti-leakage agent of the present invention is used to substitute the concrete obtained by flyash/phosphorus slag powder
A large amount of long term monitorings and practice, find, product all technical of the present invention, will up to or over national standard through inspection
It is it will be apparent that waterproofing and anti-leakage agent of the present invention has advantages below that product of the present invention is used for its advantage in concrete：
(1) mix physical performance is improved：Improve the cohesiveness and separating resistance of concrete mix, reduce bleeding, improve mixed
Solidifying soil pours packing.Mix in concrete, substitute the high-quality admixtures such as flyash, increase or decrease water consumption in (- 2~2)
kg/m3Scope.
(2) heat of hydration is reduced：Binder Materials early hydration heat is reduced, Adiabatic temperature rise of concrete value is reduced, temperature rise peak is postponed
Value time of occurrence, so as to simplify temperature control measures, reduce temperature control cost.Cement or flyash are substituted, the 7d heats of hydration can be reduced respectively
(30~60) kJ/m3(0~10) kJ/m3, concrete 28d adiabatic temperature rises can reduce (1.5~3.0) DEG C.
(3) intensity is improved：Mixing material, admixture activity are excited, late strength of concrete, especially later stage is improved and is split drawing by force
Degree, axial tensile strength and limit stretch value.Substitute flyash, concrete 90d compression strength, split tensile strength, axial tensile strength and the limit
Tension values can be respectively increased 0~15%, 8%~35%, 5%~25% and 2~15%.
(4) durability is improved：Improve concrete hole structure, strengthen concrete density, improve agent on crack resistance of concrete freeze thawing, impervious
Property and the long-term endurance quality such as corrosion resistance, wherein 90d seepage-resistant grades can improve more than W2.
(5) drying shrinkage is reduced：The air shrinkage value of concrete each age can be significantly reduced, is reduced because of the surface crack that drying causes.
Flyash or phosphorus slag powder are substituted, concrete 360d ages air shrinkage value can respectively reduce (10~70) × 10-6(30~90) × 10-6。
(6) compensation is shunk：Autogenous volumetric deformation shows as microdilatancy, and expansion beginning and ending time, swell increment are controllable, and swell increment is returned
Fall to being worth controllable in smaller range, effective compensation volume of concrete shrinks, and significantly improves the volume stability of mass concrete.Phase
To the concrete of common waterproofing and anti-leakage agent, its is swollen after 15 days to mix the concrete autogenous volumetric deformation of interior maintaining waterproofing and anti-leakage agent
Swollen value can also be maintained at (30~120) × 10-6Scope, there is provided the moisture that further hydration needs；Expansion peak value appear in 14d with
Before, stabilization is reached within 60d~120d ages, and expansion falling value is not more than 30 × 10-6。
(7) Comprehensive Crack-Resistance ability is improved：Improve the mortar Factor of Brittleness of composite gelled material, significantly improve large volume coagulation
The cracking resistance of soil.
(8) easy construction：To meet constructing operation requirement, interior maintaining anti-cracking concrete impervious agent is additional as concrete
Agent, directly mix can be carried out in work progress using inner blending method or outer doping.
(9) asepsis environment-protecting：Maintaining waterproofing and anti-leakage agent is nonpoisonous and tasteless pulverulent material, health environment-friendly in of the invention.Easily
In construction.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can carry out various changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention be defined by the appended.
Claims (10)
1. a kind of interior maintaining anti-cracking concrete impervious agent, it is characterised in that：Count by weight, its raw material includes：Flyash
30~60 parts, 10~30 parts of land plaster, 5~50 parts of magnesia, 3~15 parts of phosphoric acid hydrogen two aluminium, 3~15 parts of alum, poly- third
0.1~1 part of olefin(e) acid sodium, 0.1~1 part of hydroxypropyl methyl cellulose, 0.1~1 part of methyl silicon sodium alcoholate, sodium gluconate 0.1~1
Part.
2. maintaining anti-cracking concrete impervious agent in as claimed in claim 1, it is characterised in that：Count by weight, it is former
Material includes：35 parts of flyash, 20 parts of land plaster, 20 parts of magnesia, 8 parts of phosphoric acid hydrogen two aluminium, 6 parts of alum, Sodium Polyacrylate
0.6 part, 0.5 part of hydroxypropyl methyl cellulose, 0.4 part of methyl silicon sodium alcoholate, 0.5 part of sodium gluconate.
3. maintaining anti-cracking concrete impervious agent in as claimed in claim 1, it is characterised in that：The flyash loss on ignition≤
5%, counted with the gross weight of flyash as 100%, wherein SiO2Weight percentage be 30%~60%, Al2O3Weight percent
Content is 20%~40%.
4. maintaining anti-cracking concrete impervious agent in as claimed in claim 1, it is characterised in that：The loss on ignition of the land plaster
≤ 5%, counted with the gross weight of land plaster as 100%, wherein the weight percentage of CaO is 20%~50%, SO3Weight percent
Content is 40%~70%.
5. maintaining anti-cracking concrete impervious agent in as claimed in claim 1, it is characterised in that：The loss on ignition of the magnesia
≤ 5%, purity is 85%~100%.
6. maintaining anti-cracking concrete impervious agent in as claimed in claim 1, it is characterised in that：The Sodium Polyacrylate is effective
Water retention is more than 90%.
7. the interior maintaining anti-cracking concrete impervious agent as described in claim 1~6, it is characterised in that：Described interior maintaining
Anti-cracking concrete impervious agent specific surface area >=400m2/ kg, loss on ignition≤5%.
8. a kind of preparation method of interior maintaining anti-cracking concrete impervious agent, comprises the following steps：According to claim 1~6 times
The formula of the interior maintaining anti-cracking concrete impervious agent described in weighs each component respectively；Above-mentioned each component is added into ball mill
In, Ball-milling Time is 15~30min, you can maintaining anti-cracking concrete impervious agent in being obtained.
9. the interior maintaining anti-cracking concrete impervious agent described in claim 1~6 is used as concrete admixture application.
10. used as concrete admixture application, its feature exists interior maintaining anti-cracking concrete impervious agent as claimed in claim 9
In：Described interior maintaining anti-cracking concrete impervious agent accounts for the 8%~12% of Binder Materials gross weight.
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| CN109928775A (en) * | 2019-03-29 | 2019-06-25 | 花王生态工程股份有限公司 | A kind of curing compound and preparation method thereof that cracking resistance is strong |
| CN113429176A (en) * | 2021-07-13 | 2021-09-24 | 长江水利委员会长江科学院 | Cement-based waterproof material based on osmotic crystallization principle |
| CN114180875A (en) * | 2021-12-17 | 2022-03-15 | 武汉工程大学 | Anti-cracking and anti-permeability agent for permeable crystallization type high-performance concrete and preparation method thereof |
| CN115286429A (en) * | 2022-07-18 | 2022-11-04 | 武汉源锦建材科技有限公司 | Anticorrosive water-based permeable inorganic waterproof agent and preparation method and application thereof |
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| CN106866022B (en) | 2019-01-15 |
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