CN106118149A - A kind of aqueous inorganic zinc-enriched coating and preparation method thereof - Google Patents
A kind of aqueous inorganic zinc-enriched coating and preparation method thereof Download PDFInfo
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- CN106118149A CN106118149A CN201610496517.3A CN201610496517A CN106118149A CN 106118149 A CN106118149 A CN 106118149A CN 201610496517 A CN201610496517 A CN 201610496517A CN 106118149 A CN106118149 A CN 106118149A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
- C09D1/04—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates with organic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
Abstract
The invention discloses a kind of aqueous inorganic zinc-enriched coating and preparation method thereof.This aqueous inorganic zinc-enriched coating includes first component and second component, and the weight ratio of first component and second component is 3:7；First component includes aqueous silicate solution 80 weight portion, silane coupler 4 weight portion, silicone acrylic emulsion 15 weight portion, and the wherein said anti-settling agent of anti-settling agent 1 weight portion is made up of the attapulgite of zinc doping and silver zinc titanium dioxide；Second component is made up of zinc powder.First weigh each composition in first component successively when preparing this coating, separate packaging after high-speed stirred uniform filtering with component B and both obtained product.The compact in paint film that this coating is formed is good, and pliability and resistance to impact are good, uses double-component packaging, extends storage stability, and reduce constructional difficulties, and the method preparing this coating is the most controlled, and energy consumption is low, it is easy to industrialized production.
Description
Technical field
The invention belongs to paint field, be specifically related to a kind of aqueous inorganic zinc-enriched coating and preparation method thereof.
Background technology
Aqueous inorganic zinc-enriched coating is developed rapidly with the antiseptic property of its excellence in each developed country and applies.
The domestic research at aqueous inorganic zinc-enriched coating is started in the eighties in 20th century, and Tianjin chemical research institute begins one's study aqueous inorganic
Zinc-rich paint.Certain development has been had, such as the LW.1 type inorganic coating of Tianjin, the E06-l in Three Gorges, Chongqing, Wuhan to the nineties
Modern E777.1 etc..1994, upper Asterias amurensis Lutken bridge sci-tech consultation company limited successfully develop QSZ.1 type high mode aqueous inorganic
Zinc-rich paint, and in the girder steel agent structure that 1996 are successfully applied to Xu Pu bridge.China State Shipbuilding Corporation's institute
The most extensively, this has benefited from the decay resistance of its excellence in the E06.99 type aqueous inorganic zinc-enriched coating application studied and develop
And the coating construction performance of fast setting film forming.
Zinc-rich paint, according to the difference of film forming matter, is generally divided into organic zinc-rich paint and the big class of inorganic zinc coating two.
Organic zinc-rich paint is with synthetic resin such as epoxy, polyester resin etc. as film forming matter, preventing with high-load zinc powder as color stuffing
Rust coating, product finalizes the design almost, and is widely used；Inorganic zinc coating is (such as silicate, phosphoric acid with inorganic polymer
Salt, weight plumbite etc.) it is film forming base fluid, zinc powder reacts, and forms zinc-iron complex in metal surface, thus is formed solid
Protection film.In recent years, along with the enhancing of people's environmental protection consciousness, more and more tighter to the restriction containing volatile organic solvent
Lattice, water paint, solventless coatings etc. become the main flow of coating industry development, obtain people and more and more pay attention to.State at present
The base fluid of interior aqueous inorganic zinc-enriched coating is mainly silicate series, including the kind such as sodium silicate, potassium silicate.Inorganic zinc coating
It is better than organic zinc-rich paint, especially when as list at aspects such as electrostatic conductiveness, weatherability, thermostability, solvent resistance, rust-preventing characteristics
During one coating, there is more preferable durability and weatherability.So, inorganic zinc coating is widely used in ocean and industrial environment
The long-lasting protection of steel construction, develops in the world such as boats and ships deck-plate, offshore steel structure, basin, bridge, television tower, chemical plant etc.
Ethanol-soluble type self-curing inorganic zinc rich paint, its base material be tetraethyl orthosilicate under the catalysis of a small amount of hydrochloric acid, hydrolytie polycondensation obtains
Ethyl polysilicate, feature is fast drying, good construction adaptability, is current most widely used inorganic zinc rich paint.Later, U.S.
NA5A first developed without VOC, and the aqueous inorganic potassium silicate anticorrosive coating that Corrosion Protection is excellent.Now, Osaka
The ZIES215 waterborne inorganic einc-rich primer of paint company exploitation has also accomplished VOC zero content, and rust-preventing characteristic is excellent, resistance to oil product and
Solvent soaking, heatproof reaches 400 DEG C.
But, aqueous inorganic zinc-enriched coating still suffers from not at the aspect such as physical and mechanical properties of constructional difficulties and paint film
Foot.It is mainly manifested in: (1) microcosmic porous, shielding properties is poor.In general aqueous inorganic zinc-enriched coating, the content of zinc powder is up to 70
～80%, considerably beyond the critical size concentration (CPVC) of filler, now the amount of inorganic silicate binding agent is own not enough
To fill the space between zinc particle, cause the easy porous of coating.If being coated with other finish paints on priming paint, finish paint can be made raw
The probability becoming bubble increases.(2) difference working life of coating is short.When configuring coating, zinc powder addition is big, and zinc is an a kind of huge sum of money
Belong to, be prone to after coating configuration precipitation molding, make coating lose efficacy, bring difficulty to the high-quality of coating, high efficiency construction.
(3) execution conditions are harsh.During curing of coatings, owing to defining one layer of fine and close network between inorganic silicate, zinc powder, metal base
Closing structure, the junction of coating and base material is a kind of zinc with chemical bonds. silicate polymer, so metallic substrate surface
Process must reach more than GB8923.88Sa2.5 level.(4) fragility of coating is poor.Owing to aqueous inorganic zinc-rich coating is by inorganic silicon
Hydrochlorate and zinc powder are made, and in fragility, coating is easy to crack, and the mechanical performance such as the pliability of its coating and resistance to impact is poor.China
Patent (CN 201510354462.8) is solved by introduction organic water borne silicone acrylic emulsion in the preparation of aqueous inorganic zinc-enriched coating
The deficiency of mechanical performance, is all greatly improved in resistance to water and attachment and flexility；By introducing silane coupler
And adopt by several times dropping alr mode and make the storage stability of paint be improved.
So, aqueous inorganic zinc-enriched coating be a kind of merits and demerits it is also significant that water paint, this has a strong impact on
Its further genralrlization application.Its construction is affected by environment bigger with solidification, it is desirable to shorten the time of its film-forming further,
While not affecting its Corrosion Protection, construction requirement can be reduced again, also need to carry out deeper into R and D.
Summary of the invention
Goal of the invention: in order to overcome deficiency of the prior art, the application draws up for high mode potassium silicate solution, and uses
Silicone acrylic emulsion and silane coupler are modified to it, it is thus achieved that the aqueous inorganic zinc-rich with superior antiseptic property and mechanical performance is coated with
Material, improves the adhesive force of coating while improving paint film film, reduce difficulty of construction.
Technical scheme: for achieving the above object, the present invention by the following technical solutions:
A kind of aqueous inorganic zinc-enriched coating, including first component and second component, the weight ratio of first component and second component is 3:7；
Described first component includes the component of following parts by weight:
Aqueous silicate solution 70-80 weight portion,
Silane coupler 1-5 weight portion,
Silicone acrylic emulsion 10-15 weight portion,
Zinc phosphate 1-10 weight portion,
Anti-settling agent 1-5 weight portion, wherein said anti-settling agent is made up of the attapulgite of zinc doping and silver zinc titanium dioxide；
Described second component is made up of zinc powder.
Preferably, in described aqueous silicate solution, mass fraction or the mass percent concentration of silicate are 70-
80wt%..
Preferably, described aqueous silicate solution is the one of potassium silicate aqueous solution, sodium silicate aqueous solution or lithium silicate aqueous solution
Plant or several.
Preferably, described silane coupler include γ-(2,3-epoxy the third oxygen) propyl trimethoxy silicane (i.e. KH560),
MTMS, MTES.
The present invention utilizes the cross structure effect of silane coupler, introduces silicone acrylic emulsion and be modified in inorganic polymer,
Utilize silicone acrylic emulsion to have the advantage of organic siliconresin and acrylic emulsion concurrently, there is after curing of coating the resistance to water, weather-proof of excellence
Property and mechanical performance.And simultaneously, silicone acrylic emulsion and the chemical constitution of silicate solutions and polarity are all more or less the same, it is not easy to occur
Being separated, can compound well, the solution obtained after compounding can preferably play the advantage of the two, makes up aqueous inorganic
The defect of zinc-rich coating bad mechanical property, and do not affect its antiseptic property.
Preferably, the solid content in described silicone acrylic emulsion is 45wt%.
Preferably, the mesh number of described zinc powder is 800 mesh, and purity is more than 98wt%.
Preferably, in described anti-settling agent, the weight ratio of the attapulgite of zinc doping and silver zinc titanium dioxide is 1:0.2-1, its
The zinc doping mass fraction of the attapulgite of middle zinc doping is 5-20wt%, and in silver zinc titanium dioxide, the doping total amount of silver zinc is 3-
6wt%.
Present invention further proposes the preparation method of above-mentioned aqueous inorganic zinc-enriched coating, comprise the following steps:
(1) aqueous silicate solution, silane coupler, silicone acrylic emulsion, zinc phosphate are weighed according to formula ratio described in claim 1
And anti-settling agent, it is sequentially placed into dispersed with stirring Multi Role Aircraft high speed and stirs, obtain first component；
(2) after the first component that step (1) stirred stands froth breaking, then press formula ratio and add zinc powder, continuation with
100rpm/min 80 mesh after 30min that stir filter, and packaging i.e. obtains product.
Preferably, in step (1), the speed of high-speed stirred is 1000r/min, and mixing time is 30min.
The base material of aqueous inorganic zinc-enriched coating is mainly made up of aqueous silicate solution, wherein Si O key and solid constituent (zinc
Powder), the ferrum element of steel surface etc. generate silicate polymer.Meanwhile, absorb the moisture in air and carbon dioxide, continue
Continuous reaction, mainly generates insoluble film and netted silicic acid zinc complex network, coating is connected with steel substrate, and makes
There is the highest adhesion between coating and matrix, serve the effect of protection iron and steel.
Beneficial effect: compared with prior art, the invention have the advantages that
(1) the aqueous inorganic zinc-enriched coating dry film zinc that prepared by the present invention contains more than 85%, uses double-component packaging, stores steady
Qualitative being not less than 6 months, the mechanical performance such as the paint film adhesion formed and hardness is excellent, the 1000h of resistance to neutral salt spray test with
On, the compact in paint film formed is good, and pliability and resistance to impact are good；
(2) preparation method technique of the present invention is simple, wherein the preparation of first component only need disposably to add stirring can complete,
Energy consumption is low, easily realizes industrialized production；
(3) the invention introduce zinc phosphate, zinc phosphate Heat stability is good, the corrosion-resistant of coating can be significantly improved
Performance, but to be insoluble in water, ratio great for it, easily settles, is dissolved in silicone acrylic emulsion by zinc phosphate, may be uniformly dispersed in
In the slurry of first component, the addition of zinc phosphate simultaneously can improve the compactness of paint film, and the corrosion resistance of coating is remarkably improved
More than 10%；
(4) anti-settling agent that the present invention is made up of the attapulgite of zinc doping and silver zinc titanium dioxide, mixes in this anti-settling agent
Miscellaneous zinc, while improving coating dry film Zn content, it is also possible to prevents from precipitating molding, increases the storage stability of coating, reduces
Constructional difficulties degree.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further explained.
Embodiment 1
First weigh the potassium silicate aqueous solution of 80kg 70wt%, 3kg γ-(2,3-epoxy the third oxygen) propyl trimethoxy silicane
(i.e. KH560), 10kg solid content be 45% silicone acrylic emulsion, 5kg zinc phosphate, 1kg anti-settling agent, wherein zinc doping in anti-settling agent
The mass ratio of attapulgite and silver zinc titanium dioxide is 1:0.2, adds to dispersed with stirring Multi Role Aircraft, with 1000rpm/min
High-speed stirred 30min, after standing a period of time froth breaking, then weighs 233kg zinc powder, continues to stir with 100rpm/min
After 30min, 80 mesh filter, and packaging i.e. obtains product..
Embodiment 2
First weigh the potassium silicate aqueous solution of 75kg 75wt%, 5kg silane coupler KH560,13kg silicone acrylic emulsion, 2kg phosphorus
Acid zinc, 5kg anti-settling agent, wherein in anti-settling agent, the mass ratio of the attapulgite of zinc doping and silver zinc titanium dioxide is 1:1, adds extremely
In dispersed with stirring Multi Role Aircraft, with 1000rpm/min high-speed stirred 30min, after standing a period of time froth breaking, then weigh 233kg
Zinc powder, continues to filter with 100rpm/min 80 mesh after 30min that stir, and packaging i.e. obtains product..
Embodiment 3
First weigh the potassium silicate aqueous solution of 70kg 80wt%, 5kg MTMS, 15kg silicone acrylic emulsion, 8kg
Zinc phosphate, 2kg anti-settling agent, wherein in anti-settling agent, the mass ratio of the attapulgite of zinc doping and silver zinc titanium dioxide is 1:0.5, adds
Enter to dispersed with stirring Multi Role Aircraft, with 1000rpm/min high-speed stirred 30min, after standing a period of time froth breaking, then weigh
233kg zinc powder, continues to filter with 100rpm/min 80 mesh after 30min that stir, and packaging i.e. obtains product..
Comparative example 1
Basic experimental conditions is in prepared coating without zinc phosphate with embodiment 1, institute's difference.
Comparative example 2
Basic experimental conditions is without anti-settling agent with embodiment 1, institute's difference.
Coating prepared by embodiment 1-3 and comparative example 1-2 is directly coated by bar or spraying method with 120# respectively
On tinplate.It should be noted that when preparation is for testing the coating sample of impact resistance and adhesive force, tinplate is first used
20# sand papering, then uses acetone wiping.All coatings carry out performance test after being dried at room temperature for 1 week.Embodiment 1-3 and
The main performance testing result of coating prepared by comparative example 1-2 is shown in Table 1.
The main performance of coating prepared by table 1 embodiment 2-4
Above example is that description example effect is played in the design of the technology to the present invention, can not limit the present invention with this
Protection domain, those skilled in the art, without departing from the spirit and scope of technical solution of the present invention, modify and are equal to
Replace, all should fall within the scope and spirit of the invention.
Claims (9)
1. an aqueous inorganic zinc-enriched coating, it is characterised in that: described coating includes first component and second component, first component and second group
The weight ratio divided is 3:7；
Described first component includes the component of following parts by weight:
Aqueous silicate solution 70-80 weight portion,
Silane coupler 1-5 weight portion,
Silicone acrylic emulsion 10-15 weight portion,
Zinc phosphate 1-10 weight portion,
Anti-settling agent 1-5 weight portion, wherein said anti-settling agent is made up of the attapulgite of zinc doping and silver zinc titanium dioxide；
Described second component is made up of zinc powder.
Aqueous inorganic zinc-enriched coating the most according to claim 1, it is characterised in that: silicate in described aqueous silicate solution
Mass fraction 70-80wt%.
Aqueous inorganic zinc-enriched coating the most according to claim 1, it is characterised in that: described aqueous silicate solution is potassium silicate
One or more of aqueous solution, sodium silicate aqueous solution or lithium silicate aqueous solution.
Aqueous inorganic zinc-enriched coating the most according to claim 1, it is characterised in that: described silane coupler include γ-
(2,3-epoxy the third oxygen) propyl trimethoxy silicane, MTMS, MTES.
Aqueous inorganic zinc-enriched coating the most according to claim 1, it is characterised in that: the solid content in described silicone acrylic emulsion is
45wt%.
Aqueous inorganic zinc-enriched coating the most according to claim 1, it is characterised in that: the mesh number of described zinc powder is 800 mesh, pure
Degree is more than 98wt%.
Aqueous inorganic zinc-enriched coating the most according to claim 1, it is characterised in that: in described anti-settling agent, zinc doping is concavo-convex
The weight ratio of rod soil and silver zinc titanium dioxide is 1:0.2-1, and wherein the zinc doping mass fraction of the attapulgite of zinc doping is 5-
20wt%, in silver zinc titanium dioxide, the doping total amount of silver zinc is 3-6wt%.
8. the preparation method of the aqueous inorganic zinc-enriched coating as described in any one of claim 1-7, it is characterised in that: include
Following steps:
(1) weigh aqueous silicate solution, silane coupler, silicone acrylic emulsion, zinc phosphate according to formula ratio described in claim 1 and prevent
Heavy agent, is sequentially placed into dispersed with stirring Multi Role Aircraft high speed and stirs, obtain first component；
(2) after first component step (1) stirred stands froth breaking, then press formula ratio addition zinc powder, continue with 100rpm/
Min 80 mesh after 30min that stir filter, and packaging i.e. obtains product.
The preparation method of aqueous inorganic zinc-enriched coating the most according to claim 8, it is characterised in that: in step (1), high
The speed of speed stirring is 1000r/min, and mixing time is 30min.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107189618A (en) * | 2017-05-27 | 2017-09-22 | 太仓卡斯特姆新材料有限公司 | A kind of waterborne inorganic einc-rich primer and preparation method thereof |
| CN108659588A (en) * | 2018-04-19 | 2018-10-16 | 唐山滦硕无机硅化物有限公司 | A kind of organo-mineral complexing paint binder and its preparation method and application |
| CN109468001A (en) * | 2018-09-19 | 2019-03-15 | 惠州市惠阳区嘉泰涂料有限公司 | A kind of waterborne inorganic einc-rich primer and preparation method thereof |
| CN110527329A (en) * | 2019-08-08 | 2019-12-03 | 深圳航天科技创新研究院 | A kind of anti-algae zinc-rich anti-corrosive paint of inorganic graphite alkene antibacterial and preparation method thereof |
| CN111690276A (en) * | 2020-07-21 | 2020-09-22 | 北京莱恩斯新材料科技有限公司 | Silicate inorganic water-based paint and preparation method thereof |
| CN114574014A (en) * | 2022-03-03 | 2022-06-03 | 广州集泰化工股份有限公司 | Water-based inorganic zinc-rich coating easy to construct and preparation method and application thereof |
| CN115851013A (en) * | 2022-12-26 | 2023-03-28 | 无锡华东锌盾科技有限公司 | High-film-thickness anti-cracking inorganic zinc-rich anti-slip coating and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107189618A (en) * | 2017-05-27 | 2017-09-22 | 太仓卡斯特姆新材料有限公司 | A kind of waterborne inorganic einc-rich primer and preparation method thereof |
| CN108659588A (en) * | 2018-04-19 | 2018-10-16 | 唐山滦硕无机硅化物有限公司 | A kind of organo-mineral complexing paint binder and its preparation method and application |
| CN109468001A (en) * | 2018-09-19 | 2019-03-15 | 惠州市惠阳区嘉泰涂料有限公司 | A kind of waterborne inorganic einc-rich primer and preparation method thereof |
| CN110527329A (en) * | 2019-08-08 | 2019-12-03 | 深圳航天科技创新研究院 | A kind of anti-algae zinc-rich anti-corrosive paint of inorganic graphite alkene antibacterial and preparation method thereof |
| CN111690276A (en) * | 2020-07-21 | 2020-09-22 | 北京莱恩斯新材料科技有限公司 | Silicate inorganic water-based paint and preparation method thereof |
| CN114574014A (en) * | 2022-03-03 | 2022-06-03 | 广州集泰化工股份有限公司 | Water-based inorganic zinc-rich coating easy to construct and preparation method and application thereof |
| CN115851013A (en) * | 2022-12-26 | 2023-03-28 | 无锡华东锌盾科技有限公司 | High-film-thickness anti-cracking inorganic zinc-rich anti-slip coating and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN106118149B (en) | 2018-10-12 |
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Denomination of invention: A waterborne inorganic zinc rich coating and its preparation method Effective date of registration: 20201225 Granted publication date: 20181012 Pledgee: China Merchants Bank Limited by Share Ltd. Wuxi branch Pledgor: WUXI HUADONG ZINDN TECHNOLOGY Co.,Ltd. Registration number: Y2020320010257 |