CN110527273A - A kind of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy and preparation method thereof - Google Patents
A kind of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy and preparation method thereof Download PDFInfo
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- CN110527273A CN110527273A CN201910808158.4A CN201910808158A CN110527273A CN 110527273 A CN110527273 A CN 110527273A CN 201910808158 A CN201910808158 A CN 201910808158A CN 110527273 A CN110527273 A CN 110527273A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/08—Polyethers derived from hydroxy compounds or from their metallic derivatives
- C08L71/10—Polyethers derived from hydroxy compounds or from their metallic derivatives from phenols
- C08L71/12—Polyphenylene oxides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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Abstract
The present invention provides a kind of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloys, which is characterized in that by weight, including following components: polypropylene and 100 parts of polyphenylene oxide and polystyrene, 5-25 parts of A-B-A type block copolymer；Wherein, in A-B-A type block copolymer, A block is the copolymer of styrene, vinyl C4-C12 alkyl aromatic compound, and B block is the selective hydration polymer of conjugated diene compound, and molecular weight is 5-30 ten thousand.Polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy of the invention has the advantages that compatibility is good, toughness is high.
Description
Technical field
The present invention relates to technical field of polymer materials, close more particularly to a kind of polypropylene polyphenyleneoxidepolystyrene ternary
Gold and preparation method thereof.
Background technique
Polyphenylene oxide (PPE) heat resistance itself is higher, and mechanical property and electrical property are preferable, but its price is more expensive, solvent resistant
Performance is poor；Polypropylene (PP) is cheap, and solvent resistance is excellent, but heat resistance is lower.Common polystyrene (PS) is
Amorphous random polyme has excellent insulation, insulation and the transparency, and 0~70 DEG C of long-term use temperature, but crisp, low temperature is easy
Cracking.Triplicity can prepare moderate, heat resistance and solvent resistance equilibrium alloy material.
But the compatibility between ternary alloy three-partalloy is bad, therefore generally requires to be added between compatilizer raising
Compatibility.Chinese patent CN102719014A discloses a kind of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy, have rigidity,
Excellent balance, can be applied to every field between toughness, processing performance.Main, compatilizer is alkenyl aromatic
The selective hydration A-B-A type triblock copolymer of compound and conjugated diene, B block are conjugated diene compound, block A
For vinyl aromatic compounds；Vinyl aromatic compounds are styrene, ring-alkylated styrenes, vinyl xylene, ethyl vinyl benzene or diethyl
Alkenyl benzene, the conjugated diene compound are butadiene or isoprene.But in the formula, the toughening effect of compatilizer
It is very limited, it needs that toughener additionally is added to improve toughness in most applications.
Summary of the invention
The object of the present invention is to provide a kind of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloys, have compatibility good, tough
The high advantage of property.
Another object of the present invention is to provide the preparation methods of above-mentioned polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy.
The present invention is achieved by the following technical solutions:
A kind of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy, by weight, including following components:
Polypropylene and 100 parts of polyphenylene oxide and polystyrene,
5-25 parts of A-B-A type block copolymer；
Wherein, in A-B-A type block copolymer, A block is the copolymerization of styrene, vinyl C4-C12 alkyl aromatic compound
Object, B block are the selective hydration polymer of conjugated diene compound, and molecular weight is 5-30 ten thousand.
Including following components preferably, by weight:
Polypropylene and 100 parts of polyphenylene oxide and polystyrene,
10-18 parts of A-B-A type block copolymer；
Wherein, in A-B-A type block copolymer, A block is the copolymerization of styrene, vinyl C4-C12 alkyl aromatic compound
Object, B block are the selective hydration polymer of conjugated diene compound, and molecular weight is 5-30 ten thousand.
In existing polystyrene-poly conjugated diene compound-polystyrene block copolymer, polystyrene chain segment and poly-
The compatibility of phenylate is preferable, but it does not provide the addition of toughness；It is tough needed for the polymerized conjugated diene compound offer of B block
Property.
A block contains vinyl C4-C12 alkyl aromatic compound in the A-B-A type block copolymer that the present invention uses
Chain alkyl, chain alkyl is capable of providing certain toughness addition.Therefore the addition of A-B-A type block copolymer of the invention
The toughness of alloy can be more promoted, while there can be good compatibility.
Polystyrene accounts for the 60%-99% of A block molecule amount in the A-B-A type block copolymer.
In A block, the content of vinyl C4-C12 alkyl aromatic compound is less, is the position because of its chain alkyl
Inhibition effect can hinder the progress of polymerization, and too long chain alkyl segment can hinder the compatible of polystyrene chain segment and polyphenylene oxide
Property, reduce processing performance.Moreover, the presence of propylene chain alkyl can hinder contact of the aryl with styrene and reduce compatibility,
Therefore retaining most styrene-contents being capable of effective guarantee compatibility.
Conjugated diene compound in A-B-A type block copolymer of the invention can be commonly total in Polymer Synthesizing
Conjugate diene compound, based on the considerations of cost, the conjugated diene compound is selected from common butadiene, isoamyl two on the market
At least one of alkene, B block account for the 45-80% of A-B-A type block copolymer amount.
Preferably, in the vinyl C4-C12 alkyl aromatic compound, C4-C12 alkyl is located at the contraposition of aromatic ring.
Preferably, in the vinyl C4-C12 alkyl aromatic compound, C4-C12 alkyl is straight chain.Straight chain alkane
The effect of base is that long alkyl segment stretches out, and can be improved toughness.Hexamethylene is compared to the addition of toughness if C6 is hexyl
Base is good.But in the synthesis process, it is possible to which isomerization reaction can occur for some C4-C12 alkyl, generate other non-linear C4-
C12 alkyl, general such reaction do not exceed the 1% of total C4-C12 alkyl.
In the vinyl C4-C12 alkyl aromatic compound, aromatic compound is in phenyl, naphthalene, phenanthryl
At least one.Can also be containing such as halogen, C3 alkyl below on aromatic compound, it will not be to vinyl C4-C12 alkyl
Cause large effect.
In ternary alloy three-partalloy, polypropylene accounts for 10-60%, polyphenylene oxide accounts for 10-60%, polystyrene accounts for 5-30%；
The polyphenylene oxide that the present invention uses can be poly- 2,6- xylenol, poly- (2,6- dimethyl -1,4- phenylene) ether, gather
(2- methyl -6- ethyl -1,4- phenylene) ether, poly- (2,6- diethyl -1,4- phenylene) ether, poly- (2- ethyl -6- n-propyl -
1,4- phenylene) ether, poly- (2,6- diη-propyl -1,4- phenylene) ether, poly- (2- methyl -6- normal-butyl -1,4- phenylene)
Ether, poly- (2- ethyl -6- isopropyl -1,4- phenylene) ether, poly- (2- methyl -6- chloroethyl -1,4- phenylene) ether, poly- (2- first
Base -6- ethoxy -1,4- phenylene) ether, at least one of poly- (2- methyl -6- chloroethyl -1,4- phenylene) ether；Preferably
Poly- (2,6- dimethyl -1,4- phenylene) ether, poly- (2- methyl -6- ethyl -1,4- phenylene) ether, poly- (2,6- diethyl -1,4-
Phenylene) ether, at least one of poly- 2,6- xylenol.
The polypropylene that the present invention uses can be homopolypropylene, copolymer polypropylene, and copolymer polypropylene can be ethylene/propylene
Alkene copolymer.Polyacrylic melt index is not required particularly.
It by weight, further include 0-100 parts of reinforcing fiber；The reinforcing fiber be selected from glass fibre, carbon fiber,
At least one of metallic fiber, whisker.
It by weight, further include 0-10 parts of auxiliary agent；It is steady that the auxiliary agent is selected from antioxidant, lubricant, fire retardant, heat
Determine at least one of agent, light stabilizer, UV Absorption additive.
Antioxidant includes primary antioxidant or stabilizer (such as hindered phenol and/or secondary arylamine) and optional auxiliary antioxidant
(such as phosphate and/or thioesters).Suitable antioxidant includes such as organophosphorus ester, such as phosphorous acid three (nonyl phenyl)
Ester, phosphorous acid three (2,4- di-tert-butyl-phenyl) ester, two (2,4- di-tert-butyl-phenyl) pentaerythritol diphosphites, distearyl
Base pentaerythritol diphosphites etc., alkylated monohydric phenol or polyphenol；The alkylation reaction product of polyphenol and diene,
Such as four [methylene (3,5- di-t-butyl -4- hydroxy hydrocinnamate)] methane etc.；Paracresol or bicyclopentadiene
Butylation product；Alkvlated hvdroquinones；Hydroxylated thiodiphenyl ethers；Alkylidene bis-phenol；Benzyl compounds；β-(the tertiary fourth of 3,5- bis-
Base -4- hydroxy phenyl)-propionic acid and monohydric alcohol or polyalcohol ester；β-(5- tertiary butyl-4-hydroxy -3- aminomethyl phenyl)-propionic acid with
The ester of monohydric alcohol or polyalcohol；The ester of sulfanyl or sulphur aryl compound, such as distearyl thiopropionate, dilauryl sulphur
For propionic ester, two (tridecyl) thiopropionates, octadecyl -3- (3,5- di-tert-butyl-hydroxy phenyl) propionic ester, season
Penta tetrol-four [3- (3,5- di-tert-butyl-hydroxy phenyl)] propionic ester etc.；β-(3,5- di-tert-butyl-hydroxy phenyl)-
Amide of propionic acid etc.；Or the combination comprising at least one aforementioned antioxidant.
Suitable heat stabilizer includes such as organic phosphite, such as triphenyl phosphite, (2, the 6- diformazans of phosphorous acid three
Base phenyl) ester, phosphorous acid three (mixed list and dinonylphenyl) ester, etc.；Phosphonate ester, such as dimethylbenene phosphonate etc.
Deng；Phosphate, such as trimethyl phosphate etc.；Or the combination comprising at least one aforementioned heat stabilizer.
Light stabilizer and/or ultraviolet light (UV) absorbing additives can be added.Suitable light stabilizer includes such as benzo
Triazole type, such as 2- (2- hydroxy-5-methyl base phenyl) benzotriazole, 2- (2- hydroxyl -5- t-octyl phenyl)-benzotriazole and 2-
Hydroxyl -4- oxy-octyl benzophenone etc. also includes the UV absorbers of triazines or includes at least one aforementioned light
Stable combination.
Suitable UV absorbing additives include such as hydroxy benzophenone ketone；Hydroxybenzotriazole class；Hydroxy benzo triazine
Class；Cyanoacrylate；Butoxanilide class；Benzoxazine ketone；2- (2H- benzotriazole -2- base) -4- (1,1,3,3-
Tetramethyl butyl) phenol (CYASORM 5411)；2-hydroxy-4-n-octoxybenzophenone (CYASORM 531)；2-[4,6-
Bis- (2,4- 3,5-dimethylphenyl) -1,3,5- triazine -2- bases] -5- (octyloxy) phenol (1164)；2,2 '-(1,4- phenylenes) are double
(4H-3,1- benzoxazin-4-one) (CYASORM UV-3638)；Bis- [(2- cyano -3,3- diphenylacryloyl) oxygen of 1,3-
Base] bis- [[(2- cyano -3, the 3- diphenylacryloyl) oxygroup] methyl] propane (UVINUL 3030) of -2,2-；Nano-scale
Inorganic material, such as titanium oxide, cerium oxide and zinc oxide, all these granularities are less than 100nm, or the like；Or containing at least
A kind of combination of aforementioned UV absorbent.
The lubricant is selected from stearate series lubricant agent, fatty acid lubricant, stearate series lubricant agent, organic
At least one of silicon series lubricant agent；The stearate series lubricant agent is in calcium stearate, magnesium stearate, zinc stearate
At least one；The fatty acid lubricant is selected from least one of fatty acid, derivative of fatty acid, aliphatic ester；
The stearate series lubricant agent is selected from least one of pentaerythritol stearate；Preferably, lubricant choosing
From at least one of fatty acid lubricant, stearate series lubricant agent.
Fire retardant can be polyphosphoric acid salt compounds (ammonium polyphosphate, melamine phosphate, melamine pyrophosphoric
Salt, melamine polyphosphate etc.), it is also possible to bromo- antimony flame-retardant system (eight bromo ether, decabromodiphenylethane, brominated epoxy, bromine
Change polystyrene, antimony containing compounds etc.) etc..
The preparation method of above-mentioned polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy, comprising the following steps: according to the proportion will
Polypropylene, polyphenylene oxide, polystyrene, A-B-A type block copolymer, auxiliary agent are added in high speed mixer and are uniformly mixed, then put into
In double screw extruder, side feed reinforcing fiber, extruding pelletization obtains polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy, each area of screw rod
Between temperature be 180-195 DEG C of an area, two to nine 200-240 DEG C of areas.
The present invention compared with the existing technology, has the advantages that
The present invention is styrene, vinyl C4-C12 alkane by the way that A block is added in polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy
The copolymer of base aromatic compound, the A-B-A type block for the selective hydration polymer that B block is conjugated diene compound are total
Polymers can also be into as compatible toughening agents, while compared to existing A-B-A type toughener, it guarantees good compatibility
The toughness of one step promotion alloy.The application range of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy is expanded, it can also be reduced
The addition of his toughener.
Specific embodiment
Further illustrate that the present invention, following embodiment are the preferable embodiment party of the present invention below by specific embodiment
Formula, but embodiments of the present invention are not limited by following embodiments.
The preparation method of the polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy of embodiment and comparative example: according to the proportion by poly- third
Alkene, polyphenylene oxide, polystyrene, A-B-A type block copolymer, auxiliary agent are added in high speed mixer and are uniformly mixed, then put into double spiral shells
In bar extruder, extruding pelletization obtains polypropylene flame redardant polyphenyleneoxidepolystyrene ternary alloy three-partalloy, and each silicon carbide of screw rod is an area
180-195 DEG C, two to nine 200-240 DEG C of areas.
Embodiment and comparative example use following raw material, but do not limit the present invention:
Polyphenylene oxide: PPE LXR040；
Polypropylene: PP HP550J；
Polystyrene: PS 350K；
A-B-A type block copolymer A:A block is the copolymer of styrene, vinyl C7 straight chained alkyl phenyl, wherein styrene
Content account for about the molecular weight 76% of A block, B block is the polyisoprene of selective hydration (completely hydrogenated), and B block accounts for A-
The 65% of B-A type block copolymer total molecular weight, total molecular weight is about 200,000；
A-B-A type block copolymer B: A block is the copolymer of styrene, vinyl C4 straight chained alkyl naphthalene, wherein styrene
Content account for about the 76% of A block molecule amount, B block is the polyisoprene of selective hydration (completely hydrogenated), and B block accounts for A-
The 65% of B-A type block copolymer total molecular weight, total molecular weight is about 200,000；
A-B-A type block copolymer C: A block is the copolymer of styrene, vinyl C4 straight chained alkyl phenyl, wherein styrene
Content account for about the 76% of A block molecule amount, B block is the polyisoprene of selective hydration (completely hydrogenated), and B block accounts for A-
The 40% of B-A type block copolymer total molecular weight, total molecular weight is about 200,000；
A-B-A type block copolymer D:A block is styrene, and B block is the polyisoprene of hydrogenation, and total molecular weight is about 20
Ten thousand.
Toughener: SEBS 6151；
Lubricant: organic silicon lubricant, MB50-002；
Antioxidant: irgasfos 168/1010；
Each performance test methods:
(1) tensile strength: according to 527 standard of ISO；
(2) notch impact strength: according to 180 standard of ISO.
Table 1: embodiment and comparative example each group distribution ratio (parts by weight) and properties test result
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Comparative example 1 | Comparative example 2 | |
| Polypropylene | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Polyphenylene oxide | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 |
| Polystyrene | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| A-B-A type block copolymer A | 5 | 10 | 18 | 25 | - | - | - | - |
| A-B-A type block copolymer B | - | - | - | - | 10 | - | - | - |
| A-B-A type block copolymer C | - | - | - | - | - | 10 | - | - |
| A-B-A type block copolymer D | - | - | - | - | - | - | 10 | - |
| Toughener | - | - | - | - | - | - | - | 10 |
| Lubricant | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Antioxidant | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Tensile strength, MPa | 32 | 30 | 27 | 25 | 31 | 31 | 30 | 32 |
| Notch impact strength, kJ/m2 | 8 | 16 | 25 | 29 | 15 | 12 | 9 | 7 |
It can be seen that the rising with A-B-A type block copolymer dosage from embodiment 1-4, the toughness of product rises.
From embodiment 2/5 and comparative example 1 and comparative example 2 as can be seen that in polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy
Common SEBS, polystyrene-hydrogenation polyisoprene-polystrene ternary block polymer are imitated as its toughening of toughener
Fruit is less than A-B-A type block copolymer used in the present invention.
Claims (10)
1. a kind of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy, which is characterized in that by weight, including following components:
Polypropylene and 100 parts of polyphenylene oxide and polystyrene,
5-25 parts of A-B-A type block copolymer；
Wherein, in A-B-A type block copolymer, A block is the copolymerization of styrene, vinyl C4-C12 alkyl aromatic compound
Object, B block are the selective hydration polymer of conjugated diene compound, and molecular weight is 5-30 ten thousand.
2. polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy according to claim 1, which is characterized in that by weight,
Including following components:
Polypropylene and 100 parts of polyphenylene oxide and polystyrene,
10-18 parts of A-B-A type block copolymer；
Wherein, in A-B-A type block copolymer, A block is the copolymerization of styrene, vinyl C4-C12 alkyl aromatic compound
Object, B block are the selective hydration polymer of conjugated diene compound, and molecular weight is 5-30 ten thousand.
3. polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy according to claim 1 or 2, which is characterized in that the A-
Polystyrene accounts for the 60%-99% of A block molecule amount in B-A type block copolymer.
4. polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy according to claim 3, which is characterized in that the conjugation two
Ene compound is selected from least one of butadiene, isoprene, and B block accounts for the 45- of A-B-A type block copolymer total molecular weight
80%。
5. polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy according to claim 1 or 2, which is characterized in that the second
In alkenyl C4-C12 alkyl aromatic compound, C4-C12 alkyl is located at the contraposition of aromatic ring；Preferably, the vinyl C4-
In C12 alkyl aromatic compound, C4-C12 alkyl is straight chain.
6. polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy according to claim 1 or 2, which is characterized in that the second
In alkenyl C4-C12 alkyl aromatic compound, aromatic compound is selected from least one of phenyl, naphthalene, phenanthryl.
7. polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy according to claim 1 or 2, which is characterized in that polypropylene accounts for
10-60%, polyphenylene oxide account for 10-60%, polystyrene accounts for 5-30%.
8. polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy according to claim 1 or 2, which is characterized in that by weight
Meter, further includes 0-100 parts of reinforcing fiber；The reinforcing fiber is in glass fibre, carbon fiber, metallic fiber, whisker
At least one.
9. polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy according to claim 1 or 2, which is characterized in that by weight
Meter, further includes 0-10 parts of auxiliary agent；The auxiliary agent is selected from antioxidant, lubricant, fire retardant, heat stabilizer, light stabilizer, purple
At least one of outer light absorption additive.
10. the preparation method of polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy as claimed in claim 9, which is characterized in that including
Following steps: high speed mixing is added in polypropylene, polyphenylene oxide, polystyrene, A-B-A type block copolymer, auxiliary agent according to the proportion
It is uniformly mixed, then is put into double screw extruder in machine, extruding pelletization obtains polypropylene polyphenyleneoxidepolystyrene ternary alloy three-partalloy, spiral shell
Each silicon carbide of bar is 180-195 DEG C of an area, two to nine 200-240 DEG C of areas.
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| PCT/CN2020/103917 WO2021036615A1 (en) | 2019-08-29 | 2020-07-24 | Polypropylene-polyphenylene ether-polystyrene ternary alloy and preparation method therefor |
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| WO2021036615A1 (en) * | 2019-08-29 | 2021-03-04 | 金发科技股份有限公司 | Polypropylene-polyphenylene ether-polystyrene ternary alloy and preparation method therefor |
| CN116178844A (en) * | 2023-03-24 | 2023-05-30 | 湖南恒屹新材料有限公司 | PPE/PP alloy material for compatibilization and toughening and preparation method thereof |
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| JP2009209273A (en) * | 2008-03-04 | 2009-09-17 | Aron Kasei Co Ltd | Thermoplastic elastomer composition |
| CN102417717A (en) * | 2011-11-24 | 2012-04-18 | 上海日之升新技术发展有限公司 | Compatilizer and preparation method thereof, alloy comprising same and production method thereof |
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| WO2021036615A1 (en) * | 2019-08-29 | 2021-03-04 | 金发科技股份有限公司 | Polypropylene-polyphenylene ether-polystyrene ternary alloy and preparation method therefor |
| CN116178844A (en) * | 2023-03-24 | 2023-05-30 | 湖南恒屹新材料有限公司 | PPE/PP alloy material for compatibilization and toughening and preparation method thereof |
| CN116178844B (en) * | 2023-03-24 | 2024-05-28 | 湖南恒屹新材料有限公司 | PPE/PP alloy material for compatibilization and toughening and preparation method thereof |
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| CN110527273B (en) | 2021-11-12 |
| WO2021036615A1 (en) | 2021-03-04 |
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