CN104086903B - A kind of sealing gasket and preparation method thereof - Google Patents
A kind of sealing gasket and preparation method thereof Download PDFInfo
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- CN104086903B CN104086903B CN201410317844.9A CN201410317844A CN104086903B CN 104086903 B CN104086903 B CN 104086903B CN 201410317844 A CN201410317844 A CN 201410317844A CN 104086903 B CN104086903 B CN 104086903B
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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Abstract
The invention provides a kind of sealing gasket, the weight portion of sealing pad consists of: ethylene propylene diene rubber 50, releasing agent 1～3, dispersant 1～3, age resistor 1～5, reinforcing agent 30～50, plasticizer 1～5, coupling agent 5～15, sulphur and promoter 1～5, activating agent 1～5; Described releasing agent is at least one in Tissuemat E, polyethylene glycol. Sealing pad heat resistance, anti-wear performance, ageing resistace, intensity are all better, long service life. The invention also discloses the preparation method of sealing pad, simple to operate, cost is lower, is easy to promote.
Description
Technical field
The present invention relates to a kind of sealing gasket and preparation method thereof.
Background technology
Sealing gasket, is widely used in the static seal of faying face of pipeline, the housing of engineering machinery, becomes with its elasticityShape is filled up the unevenness of part faying face, cuts off leakage path, increases leak resistance, or bears interior outside pressureThe modes such as difference prevent flow media (gas, cooling water, lubricating oil, gear oil, hydraulic oil, brake fluid etc.)Leak. Along with the raising of scientific and technological level, the requirement of the properties to sealing gasket (comprises heat resistance, wear-resistingPerformance, ageing resistace, intensity, service life etc.) also more and more higher.
China Patent Publication No. is " a kind of high wear resistance hydraulic packing pad and the system thereof of disclosing of CN1348809APreparation Method ", by nitrile rubber, ethylene propylene diene rubber, EVA resin, octyl epoxy stearate, terpene resin,Phosphate toluene diphenyl ester, organo montmorillonite, modified Nano pottery, cerium oxide, gadolinium oxide, zinc oxide, tristearinThe raw materials such as acid barium, calcium stearate, titanium dioxide, nano aluminum alumina are made. Sealing pad mainly utilizes modified NanoPottery and rare-earth oxide improve overall performance, and effect is not good enough, and production cost is higher, unfavorableIn popularization, can not meet the demand of existing commercial Application.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of sealing gasket, heat resistance, anti-wear performance, anti-agingPerformance, intensity are all better, long service life.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of sealing gasket, its weight portion consists of:
Ethylene propylene diene rubber 50,
Releasing agent 1～3,
Dispersant 1～3,
Age resistor 1～5,
Reinforcing agent 30～50,
Plasticizer 1～5,
Coupling agent 5～15,
Sulphur and promoter 1～5,
Activating agent 1～5;
The weight percent of described releasing agent consists of: Tissuemat E 40～60%, polyethylene glycol 40～60%; InstituteThe weight percent of stating age resistor consists of: titanium dioxide 40～60%, antioxidant MB 40～60%; Described reinforcing agentWeight percent consist of: diatomite 40～60%, white carbon 40～60%; The weight percent of described plasticizerConsist of: paraffin oil 40～60%, plasticizer DEHP40～60%.
Ethylene propylene diene rubber is the rubber being formed through solution copolymerization by ethene, propylene, then introduces the 3rd monomer(ENB). The main polymer chain of EPDM is completely saturated, and this characteristic makes the ethylene propylene diene rubber canTo resist heat, light, oxygen, especially ozone. EPDM is non-polar in essence, to polar solvent andChemicals have resistance, and water absorption rate is low, have good insulation characterisitic, therefore ethylene propylene diene rubber resistance to ag(e)ingCan very good, resistance to weather good, electrical insulation capability is good, chemical resistance good, impact elasticity is better.
Releasing agent can make product surface be easy to disengaging, smooth and clean. Tissuemat E, expansion that can reinforcing fillerLoose, improve extrusion modling speed, increase mould flow, demoulding facility, improves the surface-brightening after product demouldingDegree and smoothness; Polyethylene glycol, can increase lubricity and the plasticity of product, and the power reducing in process disappearsConsumption, the service life of prolongation rubber.
Dispersant can play extraordinary peptizaiton to the dispersion of other auxiliary agents, thereby improves its usefulness, andCan well improve the compatibility of auxiliary agent in sizing material, reduce bloom.
Preferably, age resistor of the present invention be titanium dioxide, anti-aging agent RD, antioxidant MB, antioxidant BLE,In antioxidant SP, antioxidant 4020 at least two kinds, and described every kind of age resistor accounts for hundred of age resistor gross weightProportion by subtraction no more than 60%.
Along with carrying out and the development of ageing process, the performance of sealing gasket can reduce so that lose completely use valency graduallyValue. In order to extend the service life of sealing gasket, will allocate some materials that can suppress ageing process into is age resistor,Thereby extend storage period and the service life of sealing gasket. Titanium dioxide both can be used as colouring agent, had again reinforcement, anti-Aging, filling effect. In sealing gasket formula, add titanium dioxide, can be sun-resistant, acid and alkali-resistance, does not ftracture, noVariable color, percentage of elongation is large, also can strengthen anti-ozone and anti-uv-ray. Due to the anti-old effect of every kind of age resistorVariant, thus generally can add two or more age resistor, for ensureing the overall performance of sealing gasket, every60% of the no more than age resistor gross weight of weight of kind age resistor.
Preferably, reinforcing agent of the present invention be diatomite, organobentonite, sodium bentonite, white carbon,At least one in carbon black.
Reinforcing agent can increase the intensity of sealing gasket. Diatomite can obviously strengthen rigidity and the intensity of product, and can carryThe performance of heat-resisting, wear-resisting, the insulation of high product, the chemical action such as anti-aging. Organobentonite is a kind of inorganicThe compound of mineral and organic ammonium, because montmorillonite in bentonite has synusia structure, utilizes intercalation technique to haveMachine ammonium inserts in its synusia structure and obtains organobentonite, and therefore organobentonite is joined as ethylene propylene diene rubberReinforcing agent in side, compares the inorganic matters such as carbon black, potter's clay and inorganic bentonite, can with organic ternary secondThe third elastomeric material has better compatibility, and the inorganic sheet of imvite has also played ethylene propylene diene rubber matrixOxygen iris action, has protected macromolecular chain segment effectively. White carbon has superpower adhesion, tear-proof and resistance toHot ageing resistace can alternative carbon black be carried out reinforcement in colorful rubber goods, meets white or translucent productThe needs of product, also alternative part carbon black in black rubber goods, to obtain high-quality rubber.
Preferably, plasticizer of the present invention is paraffin oil, chlorinated paraffin wax, plasticizer DEHP, plasticizer DINPOr at least one in Plasticizer DBP.
Plasticizer can make the intermolecular active force of ethylene propylene diene rubber reduce, thereby reduces vitrification point, reachesTo higher elasticity, cold resistance, plasticity and mobility, be convenient to the forming operations such as calendering and extrusion. Paraffin oilCan provide the little characteristic of volatile matter under better weatherability and high temperature, the low aromatic hydrocarbon content of paraffine base crude oil and low wavingThe property sent out outclass the inadequate rubber filling oil of other refining, and can reduce the consumption of vulcanizing agent, thereby reduce costs,Anti-oxidant degradation property, the low volatility that also can improve rubber contribute to prevent aging contraction, and are conducive to changeThe bad outward appearance of kind goods (as coarse, have a bubble), this two specific character is conducive to extend the use of rubberLife-span. Can, by cooperatively interacting between plasticizer not of the same race, obtain the better ethylene propylene diene rubber of performance, fromAnd produce the better sealing gasket of performance.
Preferably, coupling agent of the present invention is in silane coupler, titanate coupling agent, aluminate coupling agentAt least one.
Coupling agent can improve the interface performance between ethylene propylene diene rubber and additive, can improve other componentsDecentralization, improve processing characteristics, mechanical performance, hot property and electrical property. Having of silane coupled agent moleculeThe polymer molecule of machine part and ethylene propylene diene rubber has stronger affinity or respond, and its hydrolyzable baseGroup, the moisture of meeting the aqueous solution, airborne moisture or inorganic matter adsorption all can cause decomposition, adds with inorganicAdding agent surface has good reactivity, and therefore, adding of silane coupler can effectively increase other components and threeThe dispersiveness of unit's EP rubbers base-material, thereby the heat resistance of raising sealing gasket. Titanate coupling agent can add with inorganicThe free proton reaction that adds agent surface forms organic supramolecular layer unique on inorganic surfaces, the lower surface of generationCan make viscosity greatly reduce, titanate coupling agent can improve impact strength and the heat resistance of ethylene propylene diene rubber, entersAnd the heat resistance of raising sealing gasket.
Preferably, the percentage by weight of sulphur of the present invention and promoter consists of: sulphur 30～60%,Surplus is promoter; Described promoter is captax, accelerant CZ, altax, diphenylguanidine, promotionAgent TT, promoter ZDC, accelerant B Z, accelerant N A-22, promoter TRA, accelerator NS, promoterIn PX or promoter PZ at least two kinds, and described every kind of promoter accounts for hundred of sulphur and promoter gross weightProportion by subtraction no more than 30%.
Sulphur is basic vulcanizing agent, can make ethylene propylene diene rubber strand play cross-linking reaction, and linear molecule is formedSpace network, plasticity reduces, and elastic strength increases, and mechanical property improves greatly. Promoter can be acceleratedThe speed that ethylene propylene diene rubber reacts with vulcanizing agent, reduces curing temperature, shortens cure time, reduces vulcanizing agentConsumption makes physical and mechanical properties, chemical property and the outward appearance of ethylene propylene diene rubber also can obtain corresponding changing simultaneouslyKind. Due to the nature difference of promoter of the same race not, according to the difference of vulcanizing agent, can add two kinds or two simultaneouslyPlant above promoter, in order to reach best cure efficiency, the no more than sulphur of weight of every kind of promoter and shortEnter 30% of agent gross weight
Preferably, activating agent of the present invention is zinc oxide, zinc carbonate, magnesia, stearic acid, zinc stearateOr in calcium stearate at least two kinds, and every kind of percentage no more than 60% that activating agent accounts for activating agent gross weight.
Activating agent, for increasing the activity of promoter, can reduce consumption, the shortening cure time of promoter, withTime can greatly improve sulphidity, activating agent can add two or more simultaneously, for balance heat resistant type closeThe properties of packing, 60% of the no more than activating agent gross weight of weight of every kind of activating agent.
As further preferred, the weight percent of described releasing agent consists of: Tissuemat E 40～60%, poly-secondGlycol 40～60% is in this ratio range, and two kinds of releasing agents cooperatively interact, and play good stripping result; InstituteThe weight percent of stating age resistor consists of: titanium dioxide 40～60%, antioxidant MB 40～60%, at this proportioning modelIn enclosing, two kinds of age resistor cooperatively interact, and play good anti-aging effect; The weight percent group of described reinforcing agentBecome: diatomite 40～60%, white carbon 40～60%, in this proportion, diatomite and white carbon canTo cooperatively interact, in rubbery intensity, can improve its heat resistance; The weight percent composition of described plasticizerFor: paraffin oil 40～60%, plasticizer DEHP40～60%, in this proportion, paraffin oil and plasticizerDEHP cooperatively interacts, and plays good plasticization effect, improves the cold resistance of rubber; Described sulphur and promotionThe weight percent of agent consists of: sulphur 40～50%, and captax 10～15%, accelerant B Z20～30%,Accelerant N A-2210～20%, in described proportion, sulphur and various promoter cooperatively interact, canReach best cure efficiency; The weight percent of described activating agent consists of: zinc oxide 20～30%, magnesia40～50%, stearic acid 20～40%, in described proportion, each activating agent cooperatively interacts, and can reachBest cure efficiency.
Another technical problem that the present invention will solve is to provide the preparation method of above-mentioned sealing gasket, simple to operate, becomesThis is lower, is easy to promote.
For solving the problems of the technologies described above, technical scheme is:
A preparation method for sealing gasket, comprises the following steps:
(1) in banbury, add ethylene-propylene diene copolymer by formula, temperature is 40～70 DEG C, banburying 30～60sAfter carry floating weight;
(2) in banbury, add coupling agent, reinforcing agent by formula, temperature is 45～75 DEG C, banburying 50～After 80s, carry floating weight;
(3) in banbury, add activating agent, releasing agent, dispersant, age resistor, plasticizer by formula,Temperature is 55～80 DEG C, behind banburying to 110～120 DEG C, carries floating weight;
(4) press floating weight after turning over glue, behind banburying to 125～135 DEG C, binder removal obtains sizing material;
(5) cooling sizing material, to room temperature, is parked 24～48H;
(6) half of cooled sizing material, sulphur and promoter are added to banbury, temperature is 40～50DEG C, then add second half sizing material to press floating weight banburying to 70～80 DEG C;
(7) turn over after glue, behind banburying to 80～100 DEG C, carry floating weight binder removal and obtain film;
(8) by film successively through extrude with compression molding after, obtain sealing gasket
Therefore compared with prior art, the present invention has following beneficial effect:
Taking ethylene propylene diene rubber as principal component, add other auxiliary agent, the heat resistance of the sealing gasket obtaining, wear-resistingPerformance, ageing resistace, intensity are all better, long service life; Raw material be easy to get and price lower, preparation methodSimple to operate, cost is lower, is easy to promote.
Detailed description of the invention
Describe the present invention in detail below in conjunction with specific embodiment, in this illustrative examples of the present invention andIllustrate for explaining the present invention, but not as a limitation of the invention.
Embodiment 1～5
The each components by weight example of sealing ring is as shown in table 1:
| Embodiment sequence number | 1 | 2 | 3 | 4 | 5 |
| Ethylene propylene diene rubber | 40 | 45 | 48 | 50 | 53 |
| Releasing agent | 2 | 2 | 2 | 2 | 1.5 |
| Dispersant | 2 | 2 | 2 | 2 | 1.5 |
| Age resistor | 2 | 2 | 2 | 2 | 1.5 |
| Reinforcing agent | 33.5 | 31.5 | 29.5 | 30.5 | 32 |
| Plasticizer | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
| Coupling agent | 12 | 10 | 9 | 8 | 6 |
| Sulphur and promoter | 3.5 | 2.5 | 2.5 | 1.5 | 1.5 |
| Activating agent | 3.5 | 3.5 | 3.5 | 2.5 | 1.5 |
Table 1
In upper table 1, releasing agent consist of Tissuemat E 50%, polyethylene glycol 50%;
Consisting of of age resistor: titanium dioxide 35%, anti-aging agent RD 65%;
Consisting of of reinforcing agent: diatomite 65%, white carbon 35%;
Consisting of of plasticizer: paraffin oil 65%, plasticizer DEHP35%;
Consisting of of coupling agent: silane coupler 6935%, titanate coupling agent KR-TTS65%;
Consisting of of sulphur and promoter: sulphur 60%, captax 15%, accelerant B Z15%, shortEnter agent NA-2210%;
Consisting of of activating agent: zinc oxide 35%, magnesia 30%, stearic acid 35%.
The preparation method of above-described embodiment comprises the following steps:
(1) in banbury, add ethylene-propylene diene copolymer by formula, temperature is 40～70 DEG C, banburying 30～60sAfter carry floating weight;
(2) in banbury, add coupling agent, reinforcing agent by formula, temperature is 45～75 DEG C, banburying 50～After 80s, carry floating weight;
(3) in banbury, add activating agent, releasing agent, dispersant, age resistor, plasticizer by formula,Temperature is 55～80 DEG C, behind banburying to 110～120 DEG C, carries floating weight;
(4) press floating weight after turning over glue, behind banburying to 125～135 DEG C, binder removal obtains sizing material;
(5) cooling sizing material, to room temperature, is parked 24～48H;
(6) half of cooled sizing material, sulphur and promoter are added to banbury, temperature is 40～50DEG C, then add second half sizing material to press floating weight banburying to 70～80 DEG C;
(7) turn over after glue, behind banburying to 80～100 DEG C, carry floating weight binder removal and obtain film;
(8) by film successively through extrude with compression molding after, obtain sealing gasket.
The properties of the preparation-obtained sealing gasket of above-described embodiment and index are as shown in table 2 and table 3:
Table 2
Table 3
From table 2 and table 3, the properties of the sealing gasket that the present invention makes is all good than prior art.
Detect through anti-biotic material inspection center of Physical Chemistry Technology Inst., Chinese Academy of Sciences;
1, antibacterial detection
Detect foundation: GB21551.2-2010 " antibacterial, the degerming of family expenses and similar applications electrical equipment, purification function "
Detect with bacterium: Escherichia coli (Escherichiacoli) ATCC25922
Staphylococcus aureus (Staphylococcusaureus) ATCC6539p
Table 4: antibacterial testing result:
2, fungicidal properties detects
Detect foundation: GB21551.2-2010 " antibacterial, the degerming of household electrical appliances and similar applications electrical equipment, purification function "
Table 5: detect with bacterium:
| Sequence number | Title | Bacterium number |
| 1 | Aspergillus niger | AS 3.4463 is equal to ATCC6275 |
| 2 | Aspergillus terreus | AS 3.3935 |
| 3 | Ball hair shell | AS 3.4254 |
| 4 | Penicillium funiculosum | AS 3.3875 |
| 5 | Aureobasidium pullulans | AS 3.3984 |
| 6 | Paecilomyces varioti | AS 3.4253 |
Table 6: fungicidal properties testing result:
| Sample title | Mildew grade | Mildew area | Remarks |
| Negative control (7 days) | 4 grades | 100％ | Cover with |
| Censorship sample (28 days) | 0 grade | 0 | ―― |
Shanghai Entry-Exit Inspection and Quarantine bureau-electronic product detection technique center is examined this product harmful substanceSurvey
Table 7: harmful substance test result (unit: mg/kg)
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention. AppointWhat person skilled in the art scholar all can, under spirit of the present invention and category, repair above-described embodimentDecorations or change. Therefore, have in technical field under such as conventionally know the knowledgeable do not depart from disclosedAll equivalences that complete under spirit and technological thought are modified or change, and must be contained by claim of the present inventionLid.
Claims (6)
1. a sealing gasket, is characterized in that: its weight portion consists of:
Ethylene propylene diene rubber 50,
Releasing agent 1～3,
Dispersant 1～3,
Age resistor 1～5,
Reinforcing agent 30～50,
Plasticizer 1～5,
Coupling agent 5～15,
Sulphur and promoter 1～5,
Activating agent 1～5;
The weight percent of described releasing agent consists of: Tissuemat E 40～60%, polyethylene glycol 40～60%; InstituteThe weight percent of stating age resistor consists of: titanium dioxide 40～60%, antioxidant MB 40～60%; Described reinforcing agentWeight percent consist of: diatomite 40～60%, white carbon 40～60%; The weight percent of described plasticizerConsist of: paraffin oil 40～60%, plasticizer DEHP40～60%.
2. a kind of sealing gasket according to claim 1, is characterized in that: described coupling agent be silane coupler,At least one in titanate coupling agent, aluminate coupling agent.
3. a kind of sealing gasket according to claim 1, is characterized in that: the weight of described sulphur and promoterAmount percentage consists of: sulphur 30～60%, and surplus is promoter; Described promoter is captax, promotionAgent CZ, altax, diphenylguanidine, promoter TT, promoter ZDC, accelerant B Z, accelerant N A-22,In promoter TRA, accelerator NS, promoter PX or promoter PZ at least two kinds, and described every kind of promotionAgent accounts for the percentage no more than 30% of sulphur and promoter gross weight.
4. a kind of sealing gasket according to claim 1, is characterized in that: described activating agent is zinc oxide, carbonIn acid zinc, magnesia, stearic acid, zinc stearate or calcium stearate at least two kinds, and every kind of activating agent accounts for workThe percentage no more than 60% of property agent gross weight.
5. a kind of sealing gasket according to claim 1, is characterized in that: the weight of described sulphur and promoterAmount percentage composition is: sulphur 40～50%, captax 10～15%, accelerant B Z20～30%, promoterNA-2210～20%; The weight percent of described activating agent consists of: zinc oxide 20～30%, and magnesia 40～50%, stearic acid 20～40%.
6. according to the preparation method of a kind of sealing gasket described in claim 1-5 any one, it is characterized in that: bagDraw together following steps:
(1) in banbury, add ethylene-propylene diene copolymer by formula, temperature is 40～70 DEG C, after banburying 30～60s, carriesFloating weight;
(2) in banbury, add coupling agent, reinforcing agent by formula, temperature is 45～75 DEG C, banburying 50～80sAfter carry floating weight;
(3) in banbury, add activating agent, releasing agent, dispersant, age resistor, plasticizer, temperature by formulaBe 55～80 DEG C, behind banburying to 110～120 DEG C, carry floating weight;
(4) press floating weight after turning over glue, behind banburying to 125～135 DEG C, binder removal obtains sizing material;
(5) cooling sizing material, to room temperature, is parked 24～48H;
(6) half of cooled sizing material, sulphur and promoter are added to banbury, temperature is 40～50 DEG C,Add again second half sizing material to press floating weight banburying to 70～80 DEG C;
(7) turn over after glue, behind banburying to 80～100 DEG C, carry floating weight binder removal and obtain film;
(8) by film successively through extrude with compression molding after, obtain sealing gasket.
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| CN104744829B (en) * | 2015-03-27 | 2016-05-18 | 上虞市舜东橡塑制品有限公司 | A kind of EPDM seal and preparation method thereof |
| CN104861313B (en) * | 2015-05-18 | 2017-10-13 | 宁波市天普橡胶科技有限公司 | A kind of preparation method of resistant to urea solution thermal-ageing-resistant rubber material |
| CN105153672A (en) * | 2015-07-14 | 2015-12-16 | 常州市盈顺电子有限公司 | Ageing resistant furan resin sealing gasket and production method thereof |
| CN106479065A (en) * | 2015-08-27 | 2017-03-08 | 德州合力佳橡塑制品有限公司 | Door of washing machine special sealing ring |
| CN106084503B (en) * | 2016-08-25 | 2019-02-22 | 兰州瑞普科技实业有限责任公司 | A kind of ethylene propylene diene monomer (EPDM) material and its preparation method and application |
| CN107163406A (en) * | 2017-05-08 | 2017-09-15 | 安徽库伯密封技术有限公司 | A kind of engine thermal management system encapsulant and preparation method thereof |
| CN108164904A (en) * | 2017-12-27 | 2018-06-15 | 宁波爱得智能科技有限公司 | A kind of ethylene propylene diene rubber and preparation method thereof |
| CN110204837A (en) * | 2019-06-17 | 2019-09-06 | 昆山依森琳川密封科技有限公司 | Gas diaphragm pump diaphragm seal cushion material and its diaphragm seal pad manufacturing process |
| KR20210074445A (en) * | 2019-12-11 | 2021-06-22 | 현대자동차주식회사 | Rubber composition improved electric insulating property for reducing galvanic corrosion |
| CN111574777B (en) * | 2020-06-17 | 2023-02-28 | 无锡朴业橡塑有限公司 | Light-colored ethylene propylene diene monomer composition and preparation method and application thereof |
| CN113652031A (en) * | 2021-08-20 | 2021-11-16 | 福州福强精密有限公司 | Low-compression permanent deformation low-temperature-resistant EPDM (ethylene-propylene-diene monomer) sealing strip as well as preparation method and application thereof |
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Address after: 312369, Xie Yang Industrial Zone, Shangyu District, Zhejiang, Shaoxing Patentee after: SHAOXING SHANGYU SHUNDONG RUBBER AND PLASTIC PRODUCT CO.,LTD. Address before: 312369, Xie Yang Industrial Zone, Shangyu District, Zhejiang, Shaoxing Patentee before: Shangyu Shundong Rubber Plastic Product Co.,Ltd. |
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Denomination of invention: A sealing gasket and its preparation method Effective date of registration: 20230607 Granted publication date: 20160518 Pledgee: Agricultural Bank of China Limited Shaoxing Shangyu sub branch Pledgor: SHAOXING SHANGYU SHUNDONG RUBBER AND PLASTIC PRODUCT CO.,LTD. Registration number: Y2023980043105 |
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