CN105925217A - Polyvinyl acetate emulsion binder - Google Patents
Polyvinyl acetate emulsion binder Download PDFInfo
- Publication number
- CN105925217A CN105925217A CN201610309373.6A CN201610309373A CN105925217A CN 105925217 A CN105925217 A CN 105925217A CN 201610309373 A CN201610309373 A CN 201610309373A CN 105925217 A CN105925217 A CN 105925217A
- Authority
- CN
- China
- Prior art keywords
- parts
- polyvinyl acetate
- binding agent
- acetate emulsion
- bisphenol
- 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
- 229920002689 polyvinyl acetate Polymers 0.000 title claims abstract description 54
- 239000011118 polyvinyl acetate Substances 0.000 title claims abstract description 54
- 239000011230 binding agent Substances 0.000 title claims abstract description 31
- 239000000839 emulsion Substances 0.000 title claims abstract description 25
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 44
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 44
- 150000004292 cyclic ethers Chemical class 0.000 claims abstract description 21
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 21
- -1 polyoxypropylene Polymers 0.000 claims abstract description 10
- 229940106691 bisphenol a Drugs 0.000 claims description 21
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 20
- 229940008099 dimethicone Drugs 0.000 claims description 20
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 20
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 20
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 20
- 239000006185 dispersion Substances 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 150000002527 isonitriles Chemical class 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 7
- 238000013019 agitation Methods 0.000 claims description 7
- 239000012467 final product Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims 2
- 239000000463 material Substances 0.000 claims 1
- 239000003365 glass fiber Substances 0.000 abstract description 9
- 239000007787 solid Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 abstract description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 abstract 1
- 125000000217 alkyl group Chemical group 0.000 abstract 1
- JZZIHCLFHIXETF-UHFFFAOYSA-N dimethylsilicon Chemical compound C[Si]C JZZIHCLFHIXETF-UHFFFAOYSA-N 0.000 abstract 1
- 150000002148 esters Chemical class 0.000 abstract 1
- 229920001228 polyisocyanate Polymers 0.000 abstract 1
- 239000005056 polyisocyanate Substances 0.000 abstract 1
- 229920001451 polypropylene glycol Polymers 0.000 abstract 1
- 239000000047 product Substances 0.000 description 14
- 238000002360 preparation method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J131/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Adhesives based on derivatives of such polymers
- C09J131/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C09J131/04—Homopolymers or copolymers of vinyl acetate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention discloses a polyvinyl acetate emulsion binder. The polyvinyl acetate emulsion binder is mainly prepared from, by weight, 60 parts of polyvinyl acetate, 10-20 parts of bisphenol A polyoxypropylene ether, 6-10 parts of alkyl polyoxyethylene ester, 6-10 parts of polyalcohol cyclic ether, 1-7 parts of polyisocyanate and 2-8 parts of dimethyl silicon oil. Compared with the prior art, the obtained polyvinyl acetate emulsion binder is low in cost and simple in process, both the solid content and the softening point of the polyvinyl acetate emulsion binder meet requirements, and an obtained glass fiber product is high in tensile strength and excellent in overall performance.
Description
Technical field
The invention discloses a kind of polyvinyl acetate emulsion binding agent, belong to technical field of polymer composite materials.
Background technology
Glass fiber product is the Inorganic Non-metallic Materials of a kind of excellent performance, not only have do not fire, high temperature resistant, electric insulation,
The premium properties such as hot strength is high, chemical stability is good, it is also possible to use organic coating treatment technology deeply to add to carry out goods
Work and expand the application of goods, be increasingly widely used in traffic, transport, build, environmental protection, oil,
Conventional industries department and national defence, the new and high technology departments such as chemical industry, electrical equipment, electronics, machinery, Aeronautics and Astronautics, nuclear energy.
Product is in process, it usually needs the use of binding agent, and including powder adhesive and emulsion binder, it respectively has excellent
Point.
At present, the glass fiber product using emulsion binder to make, it is difficult to yarn, wellability is good, but also deposits simultaneously
In some defects, such as prepared product tensile strength difference etc..
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of polyvinyl acetate emulsion to glue
Knot agent.
Technical scheme: for achieving the above object, the present invention provides a kind of polyvinyl acetate emulsion binding agent, and it is mainly
Made by the raw material of following weight ratio:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 10-20 part, polyoxyalkyl vinyl acetate 6-10 part,
Polyalcohol cyclic ethers 6-10 part, many isocyanide esters 1-7 part, dimethicone 2-8 part.
As preferably, described polyvinyl acetate emulsion binding agent is mainly made by the raw material of following weight ratio
Become:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 12-18 part, polyoxyalkyl vinyl acetate 7-9 part,
Polyalcohol cyclic ethers 7-9 part, many isocyanide esters 3-5 part, dimethicone 4-6 part.
Preferred as another kind, described polyvinyl acetate emulsion binding agent is mainly by the raw material of following weight ratio
Made:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 10 parts, polyoxyalkyl vinyl acetate 6 parts,
Polyalcohol cyclic ethers 6 parts, many isocyanide esters 1 part, dimethicone 2 parts.
Preferred as another kind, described polyvinyl acetate emulsion binding agent is mainly by the raw material of following weight ratio
Made:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 20 parts, polyoxyalkyl vinyl acetate 10 parts,
Polyalcohol cyclic ethers 10 parts, many isocyanide esters 7 parts, dimethicone 8 parts.
Preferred as another kind, the number-average molecular weight of described polyvinyl acetate is 10000-16000.
Preferred as another kind, described polyvinyl acetate emulsion binding agent is mainly made up of following steps:
(1) take poly-polyvinyl acetate and bisphenol-A polyethenoxy ether, add polyoxyalkyl vinyl acetate and the acid of many isonitrile
Ester, adds thermal agitation, obtains colostric fluid；
(2) above-mentioned colostric fluid adds polyalcohol cyclic ethers and dimethicone, high speed dispersion, to obtain final product.
Preferred as another kind, heating condition described in step (1) is 50-60 DEG C of heating 4-8h.
Preferred as another kind, high speed dispersion condition described in step (2) is that 5000-7000r/min dispersion 20-40 divides
Clock.
Beneficial effect: relative to prior art, the polyvinyl acetate emulsion binding agent of gained of the present invention, low cost, work
Skill is simple, and its solid content and softening point all meet the requirements, and obtained glass fiber product hot strength is high, and product is overall
Excellent performance.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1:
Prescription:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 10 parts, polyoxyalkyl vinyl acetate 6 parts,
Polyalcohol cyclic ethers 6 parts, many isocyanide esters 1 part, dimethicone 2 parts.
The number-average molecular weight of described polyvinyl acetate is 10000.
Preparation method:
(1) take poly-polyvinyl acetate and bisphenol-A polyethenoxy ether, add polyoxyalkyl vinyl acetate and the acid of many isonitrile
Ester, adds thermal agitation, obtains colostric fluid；
(2) above-mentioned colostric fluid adds polyalcohol cyclic ethers and dimethicone, high speed dispersion, to obtain final product.
Heating condition described in step (1) is 50 DEG C of heating 8h.
High speed dispersion condition described in step (2) is that 5000r/min disperses 40 minutes.
Embodiment 2:
Prescription:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 20 parts, polyoxyalkyl vinyl acetate 10 parts,
Polyalcohol cyclic ethers 10 parts, many isocyanide esters 7 parts, dimethicone 8 parts.
The number-average molecular weight of described polyvinyl acetate is 16000.
Preparation method:
(1) take poly-polyvinyl acetate and bisphenol-A polyethenoxy ether, add polyoxyalkyl vinyl acetate and the acid of many isonitrile
Ester, adds thermal agitation, obtains colostric fluid；
(2) above-mentioned colostric fluid adds polyalcohol cyclic ethers and dimethicone, high speed dispersion, to obtain final product.
Heating condition described in step (1) is 60 DEG C of heating 4h.
High speed dispersion condition described in step (2) is that 7000r/min disperses 20 minutes.
Embodiment 3:
Prescription:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 15 parts, polyoxyalkyl vinyl acetate 8 parts,
Polyalcohol cyclic ethers 8 parts, many isocyanide esters 4 parts, dimethicone 5 parts.
The number-average molecular weight of described polyvinyl acetate is 10000-16000.
Preparation method:
(1) take poly-polyvinyl acetate and bisphenol-A polyethenoxy ether, add polyoxyalkyl vinyl acetate and the acid of many isonitrile
Ester, adds thermal agitation, obtains colostric fluid；
(2) above-mentioned colostric fluid adds polyalcohol cyclic ethers and dimethicone, high speed dispersion, to obtain final product.
Heating condition described in step (1) is 55 DEG C of heating 6h.
High speed dispersion condition described in step (2) is that 6000r/min disperses 30 minutes.
Embodiment 4:
Prescription:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 12 parts, polyoxyalkyl vinyl acetate 7 parts,
Polyalcohol cyclic ethers 7 parts, many isocyanide esters 3 parts, dimethicone 4 parts.
The number-average molecular weight of described polyvinyl acetate is 12000.
Preparation method:
(1) take poly-polyvinyl acetate and bisphenol-A polyethenoxy ether, add polyoxyalkyl vinyl acetate and the acid of many isonitrile
Ester, adds thermal agitation, obtains colostric fluid；
(2) above-mentioned colostric fluid adds polyalcohol cyclic ethers and dimethicone, high speed dispersion, to obtain final product.
Heating condition described in step (1) is 52 DEG C of heating 7h.
High speed dispersion condition described in step (2) is that 5500r/min disperses 35 minutes.
Embodiment 5:
Prescription:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 18 parts, polyoxyalkyl vinyl acetate 9 parts,
Polyalcohol cyclic ethers 9 parts, many isocyanide esters 5 parts, dimethicone 6 parts.
The number-average molecular weight of described polyvinyl acetate is 14000.
Preparation method:
(1) take poly-polyvinyl acetate and bisphenol-A polyethenoxy ether, add polyoxyalkyl vinyl acetate and the acid of many isonitrile
Ester, adds thermal agitation, obtains colostric fluid；
(2) above-mentioned colostric fluid adds polyalcohol cyclic ethers and dimethicone, high speed dispersion, to obtain final product.
Heating condition described in step (1) is 58 DEG C of heating 5h.
High speed dispersion condition described in step (2) is that 6500r/min disperses 25 minutes.
Properties of product detection made by experimental example gained of the present invention polyvinyl acetate emulsion binding agent
Compare 1 group to use, use the embodiment of the present invention 3 prescription and preparation method, with number-average molecular weight for 9000
Polyvinyl acetate replace polyvinyl acetate gained of the present invention binding agent, made glass fiber product；
Compare 2 groups to use, use the embodiment of the present invention 3 prescription and preparation method, with number-average molecular weight for 11000
Polyvinyl acetate replace the plastic paint of polyvinyl acetate gained of the present invention, made glass fibre produces
Product；
Compare 3 groups to use, use the embodiment of the present invention 3 prescription and preparation method, remove bisphenol-A polyethenoxy ether
The binding agent of gained, made glass fiber product.
It is different that each group glass fiber product only has the binding agent used, and other preparation technologies are the most identical with formula, binding agent
Energy and properties of product testing result see table 1.
Table 1 Binder Properties and properties of product testing result (n=3)
Note: compare with control group, * P < 0.05
By upper Biao Ke get, compared with compareing 1 group, compare 2 groups and compareing 3 groups, the embodiment of the present invention 3,4 and 5
The glass fiber product that gained binding agent is made, through detection, result shows that its tensile strength is significantly increased.Further,
Its solid content and softening point all meet the requirements, and overall performance is excellent.
Claims (8)
1. a polyvinyl acetate emulsion binding agent, it is characterised in that it is mainly former by following weight ratio
Material is made:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 10-20 part, polyoxyalkyl vinyl acetate 6-10 part,
Polyalcohol cyclic ethers 6-10 part, many isocyanide esters 1-7 part, dimethicone 2-8 part.
Polyvinyl acetate emulsion binding agent the most according to claim 1, it is characterised in that it mainly by with
Made by the raw material of lower weight ratio:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 12-18 part, polyoxyalkyl vinyl acetate 7-9 part,
Polyalcohol cyclic ethers 7-9 part, many isocyanide esters 3-5 part, dimethicone 4-6 part.
Polyvinyl acetate emulsion binding agent the most according to claim 1, it is characterised in that it mainly by with
Made by the raw material of lower weight ratio:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 10 parts, polyoxyalkyl vinyl acetate 6 parts,
Polyalcohol cyclic ethers 6 parts, many isocyanide esters 1 part, dimethicone 2 parts.
Polyvinyl acetate emulsion binding agent the most according to claim 1, it is characterised in that it mainly by with
Made by the raw material of lower weight ratio:
Polyvinyl acetate 60 parts, bisphenol-A polyethenoxy ether 20 parts, polyoxyalkyl vinyl acetate 10 parts,
Polyalcohol cyclic ethers 10 parts, many isocyanide esters 7 parts, dimethicone 8 parts.
Polyvinyl acetate emulsion binding agent the most according to claim 1, it is characterised in that described poly-acetic acid second
The number-average molecular weight of alkene ester is 10000-16000.
Polyvinyl acetate emulsion binding agent the most according to claim 1, it is characterised in that it is mainly by following
Step is made:
(1) take poly-polyvinyl acetate and bisphenol-A polyethenoxy ether, add polyoxyalkyl vinyl acetate and the acid of many isonitrile
Ester, adds thermal agitation, obtains colostric fluid；
(2) above-mentioned colostric fluid adds polyalcohol cyclic ethers and dimethicone, high speed dispersion, to obtain final product.
Polyvinyl acetate emulsion binding agent the most according to claim 6, it is characterised in that institute in step (1)
Stating heating condition is 50-60 DEG C of heating 4-8h.
Polyvinyl acetate emulsion binding agent the most according to claim 6, it is characterised in that institute in step (2)
Stating high speed dispersion condition is that 5000-7000r/min disperses 20-40 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610309373.6A CN105925217B (en) | 2016-05-11 | 2016-05-11 | A kind of polyvinyl acetate emulsion binding agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610309373.6A CN105925217B (en) | 2016-05-11 | 2016-05-11 | A kind of polyvinyl acetate emulsion binding agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105925217A true CN105925217A (en) | 2016-09-07 |
| CN105925217B CN105925217B (en) | 2018-02-02 |
Family
ID=56835601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610309373.6A Active CN105925217B (en) | 2016-05-11 | 2016-05-11 | A kind of polyvinyl acetate emulsion binding agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105925217B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3856813A4 (en) * | 2018-09-28 | 2022-06-01 | Henkel IP & Holding GmbH | Use of polyvinylacetate polymers or copolymers to increase the viscosity of the isocyanate component of a two-component curable polymeric system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1072186A (en) * | 1991-11-03 | 1993-05-19 | 福州市工业科学技术研究所 | The method for preparing epoxy-polyacrylate emulsion |
| CN1560165A (en) * | 2004-02-17 | 2005-01-05 | 南京林业大学 | Aldehyde-free adhesives for artificial board |
| CN102115630A (en) * | 2009-12-31 | 2011-07-06 | 广东华润涂料有限公司 | Aqueous sealant system, wood product and method for sealing wood substrate |
| CN105385389A (en) * | 2015-12-02 | 2016-03-09 | 三棵树涂料股份有限公司 | Environment-friendly two-component wood-splicing adhesive with super water resistance and preparation method thereof |
-
2016
- 2016-05-11 CN CN201610309373.6A patent/CN105925217B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1072186A (en) * | 1991-11-03 | 1993-05-19 | 福州市工业科学技术研究所 | The method for preparing epoxy-polyacrylate emulsion |
| CN1560165A (en) * | 2004-02-17 | 2005-01-05 | 南京林业大学 | Aldehyde-free adhesives for artificial board |
| CN102115630A (en) * | 2009-12-31 | 2011-07-06 | 广东华润涂料有限公司 | Aqueous sealant system, wood product and method for sealing wood substrate |
| CN105385389A (en) * | 2015-12-02 | 2016-03-09 | 三棵树涂料股份有限公司 | Environment-friendly two-component wood-splicing adhesive with super water resistance and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李子东等: "《胶黏剂助剂》", 30 June 2009, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3856813A4 (en) * | 2018-09-28 | 2022-06-01 | Henkel IP & Holding GmbH | Use of polyvinylacetate polymers or copolymers to increase the viscosity of the isocyanate component of a two-component curable polymeric system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105925217B (en) | 2018-02-02 |
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Denomination of invention: Polyvinyl acetate emulsion binder Effective date of registration: 20181229 Granted publication date: 20180202 Pledgee: Bank of China Limited by Share Ltd. Lishui branch Pledgor: NANJING JINGJINYUAN TECHNICAL INDUSTRY Co.,Ltd. Registration number: 2018320000386 |
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Date of cancellation: 20211115 Granted publication date: 20180202 Pledgee: Bank of China Limited by Share Ltd. Lishui branch Pledgor: NANJING JINGJINYUAN TECHNICAL INDUSTRY Co.,Ltd. Registration number: 2018320000386 |
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Denomination of invention: A kind of polyvinyl acetate lotion binder Effective date of registration: 20231025 Granted publication date: 20180202 Pledgee: Bank of China Limited by Share Ltd. Lishui branch Pledgor: NANJING JINGJINYUAN TECHNICAL INDUSTRY Co.,Ltd. Registration number: Y2023980062402 |