CN113637244A - 耐高温丁腈橡胶及其应用以及密封橡胶制品的无痕分段硫化方法和主驱动密封圈 - Google Patents
耐高温丁腈橡胶及其应用以及密封橡胶制品的无痕分段硫化方法和主驱动密封圈 Download PDFInfo
- Publication number
- CN113637244A CN113637244A CN202111195394.7A CN202111195394A CN113637244A CN 113637244 A CN113637244 A CN 113637244A CN 202111195394 A CN202111195394 A CN 202111195394A CN 113637244 A CN113637244 A CN 113637244A
- Authority
- CN
- China
- Prior art keywords
- antioxidant
- composite
- parts
- rubber
- nitrile rubber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 75
- 238000007789 sealing Methods 0.000 title claims abstract description 65
- 229920000459 Nitrile rubber Polymers 0.000 title claims abstract description 35
- 238000004073 vulcanization Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000006229 carbon black Substances 0.000 claims abstract description 51
- 239000002131 composite material Substances 0.000 claims abstract description 41
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 25
- 239000004014 plasticizer Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 235000019241 carbon black Nutrition 0.000 claims description 50
- 239000003963 antioxidant agent Substances 0.000 claims description 23
- 230000003078 antioxidant effect Effects 0.000 claims description 22
- 239000010419 fine particle Substances 0.000 claims description 19
- 239000011362 coarse particle Substances 0.000 claims description 17
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 claims description 14
- 239000000047 product Substances 0.000 claims description 13
- 239000004636 vulcanized rubber Substances 0.000 claims description 13
- 239000011265 semifinished product Substances 0.000 claims description 12
- YHMYGUUIMTVXNW-UHFFFAOYSA-N 1,3-dihydrobenzimidazole-2-thione Chemical compound C1=CC=C2NC(S)=NC2=C1 YHMYGUUIMTVXNW-UHFFFAOYSA-N 0.000 claims description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 7
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 claims description 7
- OUBMGJOQLXMSNT-UHFFFAOYSA-N N-isopropyl-N'-phenyl-p-phenylenediamine Chemical compound C1=CC(NC(C)C)=CC=C1NC1=CC=CC=C1 OUBMGJOQLXMSNT-UHFFFAOYSA-N 0.000 claims description 7
- 229920001568 phenolic resin Polymers 0.000 claims description 7
- 239000005011 phenolic resin Substances 0.000 claims description 7
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 13
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract description 4
- 230000003712 anti-aging effect Effects 0.000 abstract description 3
- 235000021355 Stearic acid Nutrition 0.000 abstract description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 239000007822 coupling agent Substances 0.000 abstract description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 abstract description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 239000008117 stearic acid Substances 0.000 abstract description 2
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- 239000011593 sulfur Substances 0.000 abstract description 2
- 239000011787 zinc oxide Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000005641 tunneling Effects 0.000 description 6
- 241000872198 Serjania polyphylla Species 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000003566 sealing material Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012208 gear oil Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 210000000987 immune system Anatomy 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0053—Producing sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
Abstract
Description
丁腈橡胶 | 100份 |
复合炭黑 | 45-90份 |
氧化锌 | 3-5份 |
硬脂酸 | 1-3份 |
复合防老剂 | 2-5份 |
二氧化硅 | 25-45份 |
偶联剂 | 1.2-2.5份 |
复合增粘树脂 | 5-10份 |
复合增塑剂 | 3-5份 |
硫磺 | 2-4份 |
复合促进剂 | 1-4份 |
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202111195394.7A CN113637244B (zh) | 2021-10-14 | 2021-10-14 | 耐高温丁腈橡胶及其应用以及密封橡胶制品的无痕分段硫化方法和主驱动密封圈 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202111195394.7A CN113637244B (zh) | 2021-10-14 | 2021-10-14 | 耐高温丁腈橡胶及其应用以及密封橡胶制品的无痕分段硫化方法和主驱动密封圈 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN113637244A true CN113637244A (zh) | 2021-11-12 |
CN113637244B CN113637244B (zh) | 2022-03-15 |
Family
ID=78426817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202111195394.7A Active CN113637244B (zh) | 2021-10-14 | 2021-10-14 | 耐高温丁腈橡胶及其应用以及密封橡胶制品的无痕分段硫化方法和主驱动密封圈 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN113637244B (zh) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114395175A (zh) * | 2021-12-24 | 2022-04-26 | 山东非金属材料研究所 | 一种耐磨橡胶材料及其制备方法 |
CN115214040A (zh) * | 2022-07-05 | 2022-10-21 | 贵州红阳机械有限责任公司 | 一种丁腈橡胶及其制备工艺 |
CN116285038A (zh) * | 2023-03-21 | 2023-06-23 | 马鞍山宏力橡胶制品有限公司 | 一种回转支承丁腈密封圈胶料及该胶料的应用 |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002120231A (ja) * | 2000-10-17 | 2002-04-23 | Bridgestone Corp | ゴムクローラ製造用型 |
CN102731867A (zh) * | 2012-05-30 | 2012-10-17 | 芜湖荣基密封系统有限公司 | 一种使用时不粘模具的密封圈用橡胶材料 |
CN103044728A (zh) * | 2012-11-28 | 2013-04-17 | 沈阳工业大学 | 用于特高压大型浸油式变压器的丁腈橡胶 |
CN103289147A (zh) * | 2013-04-26 | 2013-09-11 | 焦作市万瑞轮胎辅料有限公司 | 一种o形橡胶密封圈及其生产工艺 |
CN107434896A (zh) * | 2017-08-29 | 2017-12-05 | 高科橡塑工业有限公司 | 模压无痕氟橡胶硫化胶条及其制备方法 |
CN108102169A (zh) * | 2017-12-09 | 2018-06-01 | 党亮才 | 一种高硬度丁腈橡胶及其制备方法 |
CN108656413A (zh) * | 2018-05-03 | 2018-10-16 | 青岛凯东工业有限公司 | 一种连续硫化多孔垫模腔取件装置 |
CN110128718A (zh) * | 2019-05-05 | 2019-08-16 | 浙江百朗士橡塑科技有限公司 | 一种低压缩永久变形的丁腈橡胶及其制备方法 |
CN110628098A (zh) * | 2019-08-16 | 2019-12-31 | 广东亿达汽车密封件股份有限公司 | 一种耐高温丁腈密封材料及其制备方法 |
CN210211043U (zh) * | 2019-06-25 | 2020-03-31 | 际华三五一七橡胶制品有限公司 | 一种可无痕压制的履带式平板硫化机 |
CN111440365A (zh) * | 2020-05-06 | 2020-07-24 | 大庆石油管理局有限公司 | 一种耐溶胀丁腈橡胶胶料及其制备方法、应用 |
CN113493577A (zh) * | 2020-03-18 | 2021-10-12 | 中国石油化工股份有限公司 | 一种基于丁腈橡胶和顺丁橡胶的硫化组合物、硫化橡胶及其制备方法和应用 |
-
2021
- 2021-10-14 CN CN202111195394.7A patent/CN113637244B/zh active Active
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002120231A (ja) * | 2000-10-17 | 2002-04-23 | Bridgestone Corp | ゴムクローラ製造用型 |
CN102731867A (zh) * | 2012-05-30 | 2012-10-17 | 芜湖荣基密封系统有限公司 | 一种使用时不粘模具的密封圈用橡胶材料 |
CN103044728A (zh) * | 2012-11-28 | 2013-04-17 | 沈阳工业大学 | 用于特高压大型浸油式变压器的丁腈橡胶 |
CN103289147A (zh) * | 2013-04-26 | 2013-09-11 | 焦作市万瑞轮胎辅料有限公司 | 一种o形橡胶密封圈及其生产工艺 |
CN107434896A (zh) * | 2017-08-29 | 2017-12-05 | 高科橡塑工业有限公司 | 模压无痕氟橡胶硫化胶条及其制备方法 |
CN108102169A (zh) * | 2017-12-09 | 2018-06-01 | 党亮才 | 一种高硬度丁腈橡胶及其制备方法 |
CN108656413A (zh) * | 2018-05-03 | 2018-10-16 | 青岛凯东工业有限公司 | 一种连续硫化多孔垫模腔取件装置 |
CN110128718A (zh) * | 2019-05-05 | 2019-08-16 | 浙江百朗士橡塑科技有限公司 | 一种低压缩永久变形的丁腈橡胶及其制备方法 |
CN210211043U (zh) * | 2019-06-25 | 2020-03-31 | 际华三五一七橡胶制品有限公司 | 一种可无痕压制的履带式平板硫化机 |
CN110628098A (zh) * | 2019-08-16 | 2019-12-31 | 广东亿达汽车密封件股份有限公司 | 一种耐高温丁腈密封材料及其制备方法 |
CN113493577A (zh) * | 2020-03-18 | 2021-10-12 | 中国石油化工股份有限公司 | 一种基于丁腈橡胶和顺丁橡胶的硫化组合物、硫化橡胶及其制备方法和应用 |
CN111440365A (zh) * | 2020-05-06 | 2020-07-24 | 大庆石油管理局有限公司 | 一种耐溶胀丁腈橡胶胶料及其制备方法、应用 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114395175A (zh) * | 2021-12-24 | 2022-04-26 | 山东非金属材料研究所 | 一种耐磨橡胶材料及其制备方法 |
CN114395175B (zh) * | 2021-12-24 | 2023-09-08 | 山东非金属材料研究所 | 一种耐磨橡胶材料及其制备方法 |
CN115214040A (zh) * | 2022-07-05 | 2022-10-21 | 贵州红阳机械有限责任公司 | 一种丁腈橡胶及其制备工艺 |
CN116285038A (zh) * | 2023-03-21 | 2023-06-23 | 马鞍山宏力橡胶制品有限公司 | 一种回转支承丁腈密封圈胶料及该胶料的应用 |
Also Published As
Publication number | Publication date |
---|---|
CN113637244B (zh) | 2022-03-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN113637244B (zh) | 耐高温丁腈橡胶及其应用以及密封橡胶制品的无痕分段硫化方法和主驱动密封圈 | |
CN103289150B (zh) | 一种耐寒耐磨的丁腈橡胶密封材料及其制备方法 | |
CN102634089B (zh) | 硬质矿区使用的轮胎胎面橡胶组合物及其生产方法 | |
EP2221195B1 (en) | Tire with a rubber composition and a tread of polybutadiene rubber | |
CN102516608B (zh) | 一种高耐磨优异动态性能纳米稀土无机物/橡胶复合材料 | |
CN100513465C (zh) | 飞机轮胎 | |
CN101319061B (zh) | 能适应各种路面条件使用的轮胎胎面胶配方 | |
CN103131061B (zh) | 节能输送带底胶及其制备方法 | |
CN103467799B (zh) | 一种溶聚丁苯胎面胶及其混炼工艺 | |
CN109912857B (zh) | 一种车用橡胶材料及其制备方法与应用 | |
CN103073757A (zh) | 环保型耐低凝点柴油的丁腈橡胶及其制备方法 | |
CN109251375A (zh) | 含有间苯二甲酰肼的子午胎胎面橡胶组合物及其制备方法 | |
CN103183846A (zh) | 一种矿山专用井下铲运机光面轮胎翻新胎面胶胶料 | |
CN103483677A (zh) | 一种耐磨鞋底材料 | |
CN105419023A (zh) | 一种工程车专用轮胎胎面胶 | |
CN110272594B (zh) | 一种高耐磨耐高温橡胶及其制备方法 | |
CN101935414A (zh) | 轿车轮胎胎面胶用高岭土/丁苯橡胶复合材料制备方法 | |
CN104629125B (zh) | 橡胶组合物和硫化橡胶及其制备方法以及硫化橡胶的应用 | |
CN109694508B (zh) | 熔融与化学改性轻型坦克链轨垫板衬胶复合材料及其制备方法 | |
CN104356439A (zh) | 一种船闸用高耐磨水封橡胶及其制备方法 | |
CN113801411A (zh) | 耐磨氟橡胶及其应用以及密封制品的无痕分段硫化方法 | |
CN109679163A (zh) | 一种耐煤基乙醇汽油的丁腈橡胶材料及其制备方法 | |
CN113736150A (zh) | 一种高性能胎面橡胶复合材料及其制备方法、应用 | |
CN115073832A (zh) | 一种超高承重港机实心胎胶料及制备方法 | |
CN109762217B (zh) | 一种沙船专用输送带及其制备工艺 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant | ||
CB03 | Change of inventor or designer information | ||
CB03 | Change of inventor or designer information |
Inventor after: Ding Panpan Inventor after: Li Jiaheng Inventor after: Xu Li Inventor after: Ji Meiqin Inventor after: Jia Lianhui Inventor after: Wang Jing Inventor after: Ma Liangqing Inventor after: Bai Junlie Inventor after: Sun Zhihong Inventor after: Zhang Bin Inventor after: Long Weiyang Inventor after: Cang Feifei Inventor before: Ding Panpan Inventor before: Li Jiaheng Inventor before: Xu Li Inventor before: Ji Meiqin Inventor before: Jia Lianhui Inventor before: Wang Jing Inventor before: Ma Liangqing Inventor before: Bai Junlie Inventor before: Sun Zhihong Inventor before: Zhang Bin Inventor before: Long Weiyang Inventor before: Cang Feifei |