CN106702390B - A kind of preparation method of metal inhibitor - Google Patents
A kind of preparation method of metal inhibitor Download PDFInfo
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- CN106702390B CN106702390B CN201611211652.5A CN201611211652A CN106702390B CN 106702390 B CN106702390 B CN 106702390B CN 201611211652 A CN201611211652 A CN 201611211652A CN 106702390 B CN106702390 B CN 106702390B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a kind of preparation methods of metal inhibitor, belong to corrosion inhibiter preparation technical field.The present invention first starch from sweet potato and hydrogen peroxide are mixed after with chlorosulfonic acid whip modified, then it is stirred to react under nitrogen protection to after mixture spray drying with polyglutamic acid peach gum, add distilled water, the reaction such as methyl tributanoximo silane, it is filtered after cooling discharging, collect filtered fluid freeze-drying and with isopropyl three (dioctylphyrophosphoric acid acyloxy) titanate esters, D-sorbite melt blending, finally collect mixture, metal inhibitor can be obtained, rate of metal corrosion can be effectively reduced in metal inhibitor produced by the present invention, act on metal surface, play preferable corrosion mitigating effect, and corrosion inhibiter raw material of the present invention is environmentally protective, it is low using concentration, usage amount is few, while save the cost any harm will not be caused to the health of environment and operator, with preferable prospect of the application.
Description
Technical field
The invention discloses a kind of preparation methods of metal inhibitor, belong to corrosion inhibiter preparation technical field.
Background technique
In modern industry, steel is still one of most important material, is widely used in sea, land and sky communications and transportation, bridge
The numerous areas such as beam, vehicle, mechanical equipment, petrochemical industry, urban construction, but metal erosion annoyings always people, according to report
Road, every year as metal erosion and caused by economic loss account for the 1.5~2.4% of gross national product.Metal erosion just refers to gold
Belong to the caused destruction or rotten under the action of external environment.When corrosion, chemistry or electrochemistry have occurred on the interface of metal
Heterogeneous reaction makes metal be transferred to oxidation (ion) state.This can significantly reduce the mechanics such as the intensity, plasticity, toughness of metal material
Performance destroys the geometry of metal component, increases the abrasion between part, deteriorates physical properties, the shortening such as electrical and optical and sets
Standby service life, or even cause the catastrophic failures such as fire, explosion.Corrosion not only affects the gloss of original metal, but also
Bring very huge economic loss.In order to cope with metal erosion, people are to metal inhibitor using more and more.
Corrosion inhibiter is a kind of anticorrosion chemicals, the organic matter or inorganic matter generally prepared using chemicals.
In its a small amount of addition surrounding medium, so that it may and metal surface occurs physically or chemically to act on, to reduce metal significantly
Corrosion rate.Corrosion inhibiter is used without special installation, also haves no need to change the property of metal component, have economical and effective,
Adaptable advantage, be widely used in industrial production it is each during, become a kind of important anticorrosion technique means.
What is used currently on the market is mostly traditional corrosion inhibiter, such as: sulfonate type corrosion inhibiter, single Imidazoline corrosion inhibitor,
Although the corrosion inhibiter of these types has also achieved centainly effect, since these metal inhibitors are more or less all containing toxic
Substance easily causes damages to human body and environment, while existing corrosion inhibiter is unable to satisfy the strong corrosive of oil-water media, in deep-etching
Inhibition rate under environment is lower, and improper use in use, easily causes new etching problem.
With development in science and technology, ecological environment is but gradually deteriorating.Therefore, the environmental consciousness of people constantly increases
By force, sustainable development is referred to extensively, in today of ball ecological environment worsening, the exploitation of environmentally friendly corrosion inhibiter oneself
Common recognition as scholar in terms of China and foreign countries' corrosion inhibiter.
Summary of the invention
Present invention mainly solves the technical issues of: for conventional metals corrosion inhibiter contain noxious material, easily to human body and environment
It causes damages, while the inhibition rate under strong corrosive environment is lower, improper use also will cause the defect newly corroded, provide
It is a kind of using hydrogen peroxide to starch from sweet potato carry out oxidation processes, by chlorosulfonic acid carry out sulfonation processing, then using platinum oxide as
Catalyst, methyl tributanoximo silane tie modified starch from sweet potato and polyglutamic acid, peach gum as bonding agent
It closes, increases the binding force with metal surface, improve the compactness for forming film, be finally mixed with additives such as D-sorbites
The method of metal inhibitor, the present invention first starch from sweet potato and hydrogen peroxide are mixed after with chlorosulfonic acid whip modified, then to mixing
It is stirred to react under nitrogen protection after object spray drying with polyglutamic acid, peach gum, adds distilled water, methyl tributanoximo silicon
Alkane etc. reaction, filtered after cooling discharging, collect filtered fluid freeze-drying and with isopropyl three (dioctylphyrophosphoric acid acyloxy) metatitanic acid
Ester, D-sorbite melt blending, finally collect mixture, can obtain metal inhibitor, metal inhibitor energy produced by the present invention
Rate of metal corrosion is effectively reduced, acts on metal surface, plays preferable corrosion mitigating effect, and corrosion inhibiter raw material of the present invention green
Environmental protection, low using concentration, usage amount is few, will not cause to appoint to the health of environment and operator while save the cost
What is endangered, and has preferable prospect of the application.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
(1) 1:3 in mass ratio takes the hydrogen peroxide that starch from sweet potato and mass fraction are 20% to be put into container, and set temperature is
65~70 DEG C, 1~2h is stirred with 160r/min, adds the chlorosulfonic acid of starch from sweet potato quality 4~7%, with 200r/min stirring 3
~4h, cooled to room temperature are spray-dried the mixture in container, collect dried object；
(2) according to parts by weight, 60~65 parts of distilled water, 30~35 above-mentioned dried objects, 18~20 parts of polyglutamic acids, 13 are taken
~16 parts of peach gums, 4~6 parts of methyl tributanoximo silanes and 1~3 part of platinum oxide, first by dried object, polyglutamic acid and peach gum
It is put into reaction kettle, using nitrogen protection, set temperature is 130~160 DEG C, stirs 40~50min with 170r/min；
(3) after above-mentioned stirring, the distilled water in above-mentioned parts by weight is added into reaction kettle, continue stirring 10~
15min is then cooled to 90~105 DEG C, and the methyl tributanoximo silicon in above-mentioned parts by weight is successively added into reaction kettle
Alkane and platinum oxide, then 0.3~0.5MPa is boosted to, it is stirred to react 12~15h, cooled to room temperature, material is collected out in discharging,
And be filtered, collect filtered fluid；
(4) above-mentioned filtered fluid is freeze-dried, collects freeze-drying object, 1:3:13~1:3:15 in mass ratio takes
Isopropyl three (dioctylphyrophosphoric acid acyloxy) titanate esters, D-sorbite and freeze-drying object are put into mixer, set temperature
It is 140~150 DEG C, 7~10min of melt blending, collects mixture, metal inhibitor can be obtained.
Application method of the invention is: the brass lacing film of corrosion tentatively being polished with sand paper first, is cleaned up, then will
Treated, and brass lacing film is put into 5~10min of immersion in the sulfuric acid solution that mass fraction is 10~16%, removes surface film oxide,
Metal inhibitor produced by the present invention is added in sulfuric acid solution again, additive amount is the 0.8~1.2% of sulfuric acid solution quality, with
3~5min is stirred with 80~100r/min afterwards, brass lacing film is continued into 2~5min of immersion, after the completion of impregnating, by brass
Lacing film takes out, and is rinsed 2~3 times with 35~40 DEG C of water, finally takes out brass lacing film and dries.Through detecting, the present invention is made
Metal inhibitor corrosion mitigating effect it is good, using rear brass lacing film surface-brightening, without evidence of corrosion, while the corrosion rate of workpiece
It is reduced to 0.0004~0.0016mm/a, up to 91.2~98.6%, while under strong corrosive environment, inhibition rate remains to corrosion inhibition rate
Up to 88% or more, and metal inhibitor of the present invention is free of to human body and the harmful substance of environment, will not be polluted after use, is had
There is preferable using effect.
The beneficial effects of the present invention are:
(1) metal inhibitor produced by the present invention is able to satisfy the requirement under severe corrosive environment, can effectively subtract
Slow corrosion of metal rate, and have the effect of in terms of the mechanical strength of protection metal, processing performance certain；
(2) metal inhibitor produced by the present invention has preferable corrosion mitigating effect, can more comprehensively play the work of protection metal
With, while the harm to environment and human body is reduced, it has broad application prospects, is worth promoting and applies.
Specific embodiment
First in mass ratio 1:3 takes the hydrogen peroxide that starch from sweet potato and mass fraction are 20% to be put into container, set temperature
It is 65~70 DEG C, 1~2h is stirred with 160r/min, the chlorosulfonic acid of starch from sweet potato quality 4~7% is added, is stirred with 200r/min
3~4h, cooled to room temperature are spray-dried the mixture in container, collect dried object；Then in parts by weight
Meter, takes 60~65 parts of distilled water, 30~35 above-mentioned dried objects, 18~20 parts of polyglutamic acids, 13~16 parts of peach gums, 4~6 parts of methyl
Dried object, polyglutamic acid and peach gum, are put into reaction kettle first, use nitrogen by tributanoximo silane and 1~3 part of platinum oxide
Protection, set temperature are 130~160 DEG C, stir 40~50min with 170r/min；After above-mentioned stirring, into reaction kettle
The distilled water in above-mentioned parts by weight is added, continues 10~15min of stirring, is then cooled to 90~105 DEG C, successively to reaction kettle
The middle methyl tributanoximo silane and platinum oxide being added in above-mentioned parts by weight, then 0.3~0.5MPa is boosted to, it is stirred to react
12~15h, cooled to room temperature, material is collected out in discharging, and is filtered, and collects filtered fluid；Finally by above-mentioned filtered fluid
It is freeze-dried, collects freeze-drying object, 1:3:13~1:3:15 in mass ratio takes (the dioctylphyrophosphoric acid acyl of isopropyl three
Oxygroup) titanate esters, D-sorbite and freeze-drying object be put into mixer, set temperature be 140~150 DEG C, melt blending 7~
10min collects mixture, can obtain metal inhibitor.
Example 1
First in mass ratio 1:3 takes the hydrogen peroxide that starch from sweet potato and mass fraction are 20% to be put into container, set temperature
It is 65 DEG C, 1h is stirred with 160r/min, adds the chlorosulfonic acid of starch from sweet potato quality 4%, 3h is stirred with 200r/min, it is naturally cold
But to room temperature, the mixture in container is spray-dried, collects dried object；Then according to parts by weight, 60 parts of distillations are taken
Water, 30 above-mentioned dried objects, 18 parts of polyglutamic acids, 13 parts of peach gums, 4 parts of methyl tributanoximo silanes and 1 part of platinum oxide first will
Dried object, polyglutamic acid and peach gum are put into reaction kettle, and using nitrogen protection, set temperature is 130 DEG C, are stirred with 170r/min
40min；After above-mentioned stirring, the distilled water in above-mentioned parts by weight is added into reaction kettle, continues to stir 10min, with
After be cooled to 90 DEG C, methyl tributanoximo silane and platinum oxide in above-mentioned parts by weight are successively added into reaction kettle, then
0.3MPa is boosted to, 12h is stirred to react, cooled to room temperature, material is collected out in discharging, and is filtered, and collects filtered fluid；
Finally above-mentioned filtered fluid is freeze-dried, collects freeze-drying object, 1:3:13 in mass ratio takes three (dioctyl of isopropyl
Pyrophosphoric acid acyloxy) titanate esters, D-sorbite and freeze-drying object be put into mixer, set temperature be 140 DEG C, melt blending
7min collects mixture, can obtain metal inhibitor.
This example operation is easy, in use, the brass lacing film of corrosion is tentatively polished with sand paper first, is cleaned up, with
By treated, brass lacing film is put into mass fraction to impregnate 5min in 10% sulfuric acid solution afterwards, removes surface film oxide, then will
Metal inhibitor produced by the present invention is added in sulfuric acid solution, and additive amount is the 0.8% of sulfuric acid solution quality, then with 80r/
Min is stirred 3min, continues the brass lacing film to impregnate 2min and takes out brass lacing film after the completion of impregnating, and with 35 DEG C of water
It rinses 2 times, finally takes out brass lacing film and dry.Through detecting, metal inhibitor corrosion mitigating effect produced by the present invention is good, uses
Brass lacing film surface-brightening afterwards is reduced to 0.0004mm/a without the corrosion rate of evidence of corrosion, while workpiece, and corrosion inhibition rate reaches
91.2%, while under strong corrosive environment, inhibition rate is remained to up to 89%, and metal inhibitor of the present invention is free of to human body and environment
Harmful substance will not pollute after use, have preferable using effect.
Example 2
First in mass ratio 1:3 takes the hydrogen peroxide that starch from sweet potato and mass fraction are 20% to be put into container, set temperature
It is 68 DEG C, 1h is stirred with 160r/min, adds the chlorosulfonic acid of starch from sweet potato quality 6%, 3h is stirred with 200r/min, it is naturally cold
But to room temperature, the mixture in container is spray-dried, collects dried object；Then according to parts by weight, 63 parts of distillations are taken
Water, 33 above-mentioned dried objects, 19 parts of polyglutamic acids, 15 parts of peach gums, 5 parts of methyl tributanoximo silanes and 2 parts of platinum oxides first will
Dried object, polyglutamic acid and peach gum are put into reaction kettle, and using nitrogen protection, set temperature is 145 DEG C, are stirred with 170r/min
45min；After above-mentioned stirring, the distilled water in above-mentioned parts by weight is added into reaction kettle, continues to stir 13min, with
After be cooled to 98 DEG C, methyl tributanoximo silane and platinum oxide in above-mentioned parts by weight are successively added into reaction kettle, then
0.4MPa is boosted to, 14h is stirred to react, cooled to room temperature, material is collected out in discharging, and is filtered, and collects filtered fluid；
Finally above-mentioned filtered fluid is freeze-dried, collects freeze-drying object, 1:3:14 in mass ratio takes three (dioctyl of isopropyl
Pyrophosphoric acid acyloxy) titanate esters, D-sorbite and freeze-drying object be put into mixer, set temperature be 145 DEG C, melt blending
9min collects mixture, can obtain metal inhibitor.
The brass lacing film of corrosion is tentatively polished with sand paper first, is cleaned up, then brass lacing film is put by treated
Enter in the sulfuric acid solution that mass fraction is 13% and impregnate 8min, remove surface film oxide, then by metal inhibitor produced by the present invention
It is added in sulfuric acid solution, additive amount is the 1.0% of sulfuric acid solution quality, then 4min is stirred with 90r/min, by brass
Lacing film continues immersion 4min and takes out brass lacing film after the completion of impregnating, and is rinsed 2 times with 38 DEG C of water, finally takes out brass and hangs
Piece dries.Through detecting, metal inhibitor corrosion mitigating effect produced by the present invention is good, using rear brass lacing film surface-brightening, does not have
There is evidence of corrosion, while the corrosion rate of workpiece is reduced to 0.0012mm/a, corrosion inhibition rate is up to 94.8%, while in strong corrosive environment
Under, inhibition rate is remained to up to 90%, and metal inhibitor of the present invention is free of to human body and the harmful substance of environment, will not after use
It pollutes, there is preferable using effect.
Example 3
First in mass ratio 1:3 takes the hydrogen peroxide that starch from sweet potato and mass fraction are 20% to be put into container, set temperature
It is 70 DEG C, 2h is stirred with 160r/min, adds the chlorosulfonic acid of starch from sweet potato quality 7%, 4h is stirred with 200r/min, it is naturally cold
But to room temperature, the mixture in container is spray-dried, collects dried object；Then according to parts by weight, 65 parts of distillations are taken
Water, 35 above-mentioned dried objects, 20 parts of polyglutamic acids, 16 parts of peach gums, 6 parts of methyl tributanoximo silanes and 3 parts of platinum oxides first will
Dried object, polyglutamic acid and peach gum are put into reaction kettle, and using nitrogen protection, set temperature is 160 DEG C, are stirred with 170r/min
50min；After above-mentioned stirring, the distilled water in above-mentioned parts by weight is added into reaction kettle, continues to stir 15min, with
After be cooled to 105 DEG C, methyl tributanoximo silane and platinum oxide in above-mentioned parts by weight are successively added into reaction kettle, then
0.5MPa is boosted to, 15h is stirred to react, cooled to room temperature, material is collected out in discharging, and is filtered, and collects filtered fluid；
Finally above-mentioned filtered fluid is freeze-dried, collects freeze-drying object, 1:3:15 in mass ratio takes three (dioctyl of isopropyl
Pyrophosphoric acid acyloxy) titanate esters, D-sorbite and freeze-drying object be put into mixer, set temperature be 150 DEG C, melt blending
10min collects mixture, can obtain metal inhibitor.
This example operation is easy, in use, the brass lacing film of corrosion is tentatively polished with sand paper first, is cleaned up, with
10min is impregnated in the sulfuric acid solution for being afterwards 16% by treated brass lacing film is put into mass fraction, removes surface film oxide, then
Metal inhibitor produced by the present invention is added in sulfuric acid solution, additive amount be sulfuric acid solution quality 1.2%, then with
100r/min is stirred 5min, and brass lacing film is continued immersion 5min and takes out brass lacing film after the completion of impregnating, is used in combination
40 DEG C of water rinse 3 times, finally take out brass lacing film and dry.Through detecting, metal inhibitor corrosion mitigating effect produced by the present invention
It is good, using rear brass lacing film surface-brightening, it is reduced to 0.0016mm/a without the corrosion rate of evidence of corrosion, while workpiece, is delayed
Erosion rate is up to 98.6%, while under strong corrosive environment, and inhibition rate is remained to up to 91%, and metal inhibitor of the present invention is free of to human body
And the harmful substance of environment, it will not be polluted after use, there is preferable using effect.
Claims (1)
1. a kind of preparation method of metal inhibitor, it is characterised in that it is specific the preparation method comprises the following steps:
(1) 1:3 in mass ratio, taking starch from sweet potato and mass fraction is that 20% hydrogen peroxide is put into container, set temperature is 65~
70 DEG C, 1~2h is stirred with 160r/min, adds the chlorosulfonic acid of starch from sweet potato quality 4~7%, 3~4h is stirred with 200r/min,
Cooled to room temperature is spray-dried the mixture in container, collects dried object；
(2) according to parts by weight, 60~65 parts of distilled water, 30~35 above-mentioned dried objects, 18~20 parts of polyglutamic acids, 13~16 are taken
Dried object, polyglutamic acid and peach gum, are put by part peach gum, 4~6 parts of methyl tributanoximo silanes and 1~3 part of platinum oxide first
In reaction kettle, using nitrogen protection, set temperature is 130~160 DEG C, stirs 40~50min with 170r/min；
(3) after above-mentioned stirring, the distilled water in above-mentioned parts by weight is added into reaction kettle, continue stirring 10~
15min is then cooled to 90~105 DEG C, and the methyl tributanoximo silicon in above-mentioned parts by weight is successively added into reaction kettle
Alkane and platinum oxide, then 0.3~0.5MPa is boosted to, it is stirred to react 12~15h, cooled to room temperature, material is collected out in discharging,
And be filtered, collect filtered fluid；
(4) above-mentioned filtered fluid is freeze-dried, collects freeze-drying object, 1:3:13~1:3:15 in mass ratio takes isopropyl
Base three (dioctylphyrophosphoric acid acyloxy) titanate esters, D-sorbite and freeze-drying object are put into mixer, set temperature 140
~150 DEG C, 7~10min of melt blending, mixture is collected, metal inhibitor can be obtained.
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| CN201811262693.6A CN109082667B (en) | 2016-12-25 | 2016-12-25 | Metal corrosion inhibitor |
| CN201611211652.5A CN106702390B (en) | 2016-12-25 | 2016-12-25 | A kind of preparation method of metal inhibitor |
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| CN201611211652.5A CN106702390B (en) | 2016-12-25 | 2016-12-25 | A kind of preparation method of metal inhibitor |
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| CN104313593B (en) * | 2014-11-06 | 2017-01-25 | 马鞍山市鸿伟环化有限公司 | Aluminum acid pickling corrosion inhibitor and preparation method and application thereof |
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| CN1556246A (en) * | 2004-01-08 | 2004-12-22 | 中国国际海运集装箱（集团）股份有限 | Chromium less deactivation liquid |
| KR20070090808A (en) * | 2006-03-03 | 2007-09-06 | 멧쿠 가부시키가이샤 | Surface treating agent and method for manufacturing coating using the same |
| CN101709132B (en) * | 2009-08-24 | 2011-07-20 | 陕西易莱德新材料科技有限公司 | Composite conductive polymer for flexible anode and preparation process thereof |
| JP2013036093A (en) * | 2011-08-09 | 2013-02-21 | Kyoeisha Chem Co Ltd | Sustained-release rust-preventive material |
| CN104109863A (en) * | 2014-08-01 | 2014-10-22 | 武钢集团昆明钢铁股份有限公司 | Rust preventer and preparation method and application thereof |
| CN105483713B (en) * | 2015-12-05 | 2017-08-29 | 西南林业大学 | A kind of modified high-molecular compound corrosion inhibitor and preparation method and application |
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| CN104313593B (en) * | 2014-11-06 | 2017-01-25 | 马鞍山市鸿伟环化有限公司 | Aluminum acid pickling corrosion inhibitor and preparation method and application thereof |
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| CN109082667A (en) | 2018-12-25 |
| CN109082667B (en) | 2021-09-21 |
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Effective date of registration: 20181114 Address after: 516006 No. 18, 14th Floor, Innovation Building, 106 Dongxin Avenue, Dongxing District, Dongjiang Science Park, Zhongkai High-tech Zone, Huizhou City, Guangdong Province Applicant after: Huizhou Rui Xiang Feng Technology Co., Ltd. Address before: 213164 C 308, Tianrun science and technology building, 801 Changwu Middle Road, Wujin District, Changzhou, Jiangsu. Applicant before: Changzhou Mengtai Lighting Technology Co., Ltd. |
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