CN107033846B - A kind of haze inhibitor and preparation method thereof - Google Patents
A kind of haze inhibitor and preparation method thereof Download PDFInfo
- Publication number
- CN107033846B CN107033846B CN201710244325.8A CN201710244325A CN107033846B CN 107033846 B CN107033846 B CN 107033846B CN 201710244325 A CN201710244325 A CN 201710244325A CN 107033846 B CN107033846 B CN 107033846B
- Authority
- CN
- China
- Prior art keywords
- haze
- water
- inhibitor
- haze inhibitor
- added
- 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.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/22—Materials not provided for elsewhere for dust-laying or dust-absorbing
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Abstract
The invention discloses a kind of haze inhibitor, including following component: cationic polyacrylamide, calcium salt, polyalcohol gather polynary hydrochlorate, bleeding agent and water.The good water solubility of cationic polyacrylamide used in the present invention (CPAM), solution rate is fast, and water absorbency and water retentivity is strong, can keep the humidity of site of administration；The CPAM has a variety of reactive groups, affinity interaction can occur, adsorb and reunite and condense into bulk matter with the aerosol in many kinds of substance such as air, minute dusts etc., prevent fugitive dust again；The substances such as calcium salt used in the present invention, polyalcohol or sodium polyacid all have good moisture retention, play bridging action in formula, to particle grab conjunction property it is good；Haze inhibitor of the invention can be absorbed by plants, and not generate injury to vegetation, will not cause secondary pollution to environment；Haze of the invention inhibits agent compounding method easy, can be carried out in situ in municipal administration and efforts at environmental protection, easy to spread.
Description
Technical field
The present invention relates to environmental technology fields more particularly to a kind of haze inhibitor and preparation method thereof.
Background technique
Haze along with the production and living activity of people, can generate human body and seriously affect always.With mankind's activity
Aggravation, haze are increasingly severe.In some areas in most of the northern region of China and the Sichuan Basin, haze serious shadow
It rings people's life and endangers the physical and mental health or even life security of people.National correlation department is big to haze controlling input
Funds and energy of amount, and put into effect numerous control measures, have achieved the effect that certain, but haze is still serious.
There is a kind of phenomenon especially to merit attention, exactly haze reduces suddenly after rainy and clammy air, air quality
It immediately becomes good or even outstanding.But rainy and clammy air is after a period of time, haze rises very rapidly up to high level again,
Which results in haze difficulty of governance.From the analysis of the source resolution of haze, it is not difficult to find out that, fugitive dust is more than to the contribution rate of China's haze
30%, the meteorological conditions such as rainy can be clean by air cleaning, and the particulate matter and aerosol in air are with rainwater landing ground.
Particulate matter once meteorological condition variation (ground dry after), ground of landing can occur in the form of fugitive dust again, finally again into
Enter atmosphere, haze can generate rapidly again.
Haze is administered other than current measure, it is most important that control ground floating dust, floating dust is captured and is formed big
Particle makes it not have a possibility that fugitive dust again, this is one of the method for fundamentally controlling haze.
The haze of developed country is lighter, currently without the dust suppressant report specifically for haze, only to control mine, harbour
The method of dust from land surface and the dust suppressant of use are reported, such as solidify floating dust using pitch, calcium chloride water.But this
A little methods are not suitable for urban road and in the street, and main cause or can be impacted to urban operating mechanism because constructing cumbersome.
RO122545B1, US6616739B1, US2009166582A1, CN104449579A, CN1468930A propose non-bituminous etc.
Method of the petroleum by-products as the main composition of dust suppressant, wherein US6616739B1 and US2009166582A1 uses low molecular weight
Carbohydrate reduces the corrosion of chloride ion (calcium chloride) as auxiliary agent, using initiator, stabilizer, each in CN105400494A
Kind surfactant and water have prepared osmosis type dust inhibitor, and the dust suitable for the mineral storage and transportation such as coal etc. inhibits；
CN104449579A has prepared a kind of dust suppression using surfactant, stabilizer, thickener, antifreeze auxiliary agent, bacteriostatic agent and water
The anti-dust effect of agent, report is preferable, but lacks persistence.The formula that above-mentioned all patents use is not suitable for dust pollution most substantially
The urban road of weight, in the street and highway, impacts in addition to that may impact to vegetation, to municipal administration and road equipment
Outside, do not have the permanent ability for inhibiting haze yet, be also possible to impact aquatile into water body.
The present invention provides a kind of haze inhibitor and preparation method thereof, feature is to use widely to use in water process
CPAM, after trap particles substance and ground dust, can be reunited is bulky grain, and easy cleaning can also enter water with rainwater
Body prevents it to be again introduced into atmosphere, achievees the purpose that inhibit haze.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of haze inhibitor and preparation method thereof, purports
Dust cannot effectively be solidified and existing dust inhibitor is not suitable for urban operating mechanism or will cause secondary pollution solving
Etc. technical problems, it is ensured that urban operating mechanism and safety are not influenced after use, can be absorbed by plants, into water body after can be natural
Degradation, does not cause damages to aquatile.
Technical scheme is as follows:
A kind of haze inhibitor, includes following component according to mass percent: 5~10% cationic polyacrylamide
(CPAM), 1~5% calcium salt, 3~5% polyalcohol or gather polynary hydrochlorate, 1~5% bleeding agent, remaining group is divided into water.
Preferably, the bleeding agent is lauryl sodium sulfate or dodecyl sodium sulfate.
Preferably, the polyalcohol or gather polynary hydrochlorate be polyethylene glycol -200, glycerine, propylene glycol and sodium polycarboxylate
In any one.
Preferably, the calcium salt is calcium chloride, calcium nitrate, any one in calcium acetate or a variety of any combination.
Preferably, the CPAM is by acrylamide (AM) and methacryloxypropyl vinyl trimethyl ammonium chloride (DMC)
It is synthesized under the conditions of initiator is added, specific reaction equation is as follows:
Preferably, the synthetic method of the CPAM, comprising the following steps:
A, equipped with blender, thermometer, reflux condenser and gas conduit reaction kettle in, be added design flow AM and
DMC, urea, disodium ethylene diamine tetraacetate (EDTA-2Na) and deionized water lead to N under the revolving speed of 50~80r/min2Stirring
25~35min；
B, the redox initiator of metering is configured to 0.5~2% aqueous solution, is added in reaction kettle, is added simultaneously
Enter a certain amount of azodiisobutyronitrile (AIBN)；Reaction temperature is risen to 25~35 DEG C, under the revolving speed of 50~100r/min, is led to
N2Stir 25~35min；
C, stop being passed through N2, rapidly that reaction kettle is closed, after reacting 3~4h at 25~35 DEG C, adjusting reaction temperature is
45~55 DEG C, continues to stand 1.5~2.5h of reaction, obtain clear gum product；By jelly 40 in 55~65 DEG C of baking ovens~
60h, and dry solid is crushed to get powdery CPAM is arrived.
Preferably, in the step A, the mass ratio of AM and DMC are (3~4): 1.
Preferably, in the step B, the redox initiator is (NH4)2S2O8And NaHSO3Mixture.
It is further preferred that (NH4)2S2O8And NaHSO3Mass ratio be 1:1.
A kind of preparation method of haze inhibitor, comprising the following steps: measure addition in the container with stirring
(undried CPAM after polymerisation in solution synthesis also can be used) after stirring 25~35min dissolution, in stirring bar in water and CPAM
Bleeding agent, calcium salt and polyalcohol are sequentially added under part or gathers polynary hydrochlorate, are obtained the haze after mixing and are inhibited
Agent.
Preferably, haze inhibitor prepared by the present invention is added in sprinkling truck water pot according to 5~10% ratios, adds water
It sprinkles water afterwards according to normal condition to road surface.Addition haze inhibitor water be sprayed onto road surface after, can road pavement moisturizing, have to dust
Very strong absorption package ability, easy cleaning can also enter water body with rainwater, prevent fugitive dust again, thus effectively inhibit haze.And
Road surface is not tacky, wet and slippery, does not corrode urban operating mechanism, on periphery vegetation without influence, can be absorbed by plants, into water body after it is not right
Aquatile impacts.
The invention has the beneficial effects that:
1. the good water solubility of cationic polyacrylamide used in the present invention, solution rate is fast, water absorbency and water retentivity
By force, the humidity of site of administration can be kept.
2. cationic polyacrylamide used in the present invention have a variety of reactive groups, can in many kinds of substance such as air
Aerosol, minute dusts etc. occur affinity interaction, adsorb and reunite and condense into bulk matter, prevent fugitive dust again.
3. the raw material for preparing haze inhibitor can be bought in market, source is convenient, cheap；Preparation method is easy,
It can be carried out in situ in municipal administration and efforts at environmental protection, it is easy to spread.
4. calcium salt used in the present invention, polyalcohol, the substances such as sodium polyacid all have good moisture retention, are matching
Bridging action is played in side, to particle grab conjunction property it is good.
5. haze inhibitor of the invention can be absorbed by plants, does not generate injury to vegetation, do not corrode building facility, with rain
It is harmless to aquatile after water flows into water body, secondary pollution will not be caused to environment.
Detailed description of the invention:
Fig. 1: the preparation flow figure of haze inhibitor of the invention.
Specific embodiment
Application principle of the invention is explained in detail with reference to the accompanying drawing.
A kind of haze inhibitor of the present invention is composed of the following components: 5~10% cationic polyacrylamide
(CPAM), 1~5% calcium salt, 3~5% polyalcohol or gather polynary hydrochlorate, 1~5% bleeding agent, remaining group is divided into water.Institute
The production method of haze inhibitor is stated the following steps are included: the water and cation for addition being measured in the container with stirring
Polyacrylamide Powder (also can be used undried CPAM after polymerisation in solution synthesis) after stirring dissolution in 30 minutes, stir
Under the conditions of sequentially add bleeding agent, calcium salt and polyalcohol or gather polynary hydrochlorate, obtain the haze suppression after mixing
Preparation.
Application principle of the invention is further described combined with specific embodiments below.
The preparation of CPAM:
Equipped with blender, thermometer, reflux condenser and gas conduit reaction kettle in, be added design flow AM and
DMC (fixed mass ratio is AM:DMC=3:1~4:1), urea, EDTA-2Na and deionized water, under the revolving speed of 60r/min,
Logical N2Stir 30min；
By the redox initiator of metering, (fixed mass ratio is (NH4)2S2O8:NaHSO3=1:1) it is configured to 1% water
Solution is added in reaction kettle, while a certain amount of AIBN is added；Reaction temperature is risen to 30 DEG C, in the revolving speed of 60r/min
Under, lead to N2Stir 30min；Stopping is passed through N2, rapidly that reaction kettle is closed, after reacting 3.5h at 30 DEG C, adjusting reaction temperature is
50 DEG C, continues to stand reaction 2h, obtain clear gum product；By jelly in 60 DEG C of baking ovens 48h, and by dry solid powder
It is broken to get arrive powdery CPAM.
A kind of preparation process of typical cationic polyacrylamide is described as follows:
By 26.25kg AM, 8.75kg DMC, 1.0kg urea, 1.5kg EDTA-2Na and 56.41kg deionized water is set
In 200L reaction kettle, under the revolving speed of 60r/min, room temperature leads to N2Stir 30min.By 6kg (NH4)2S2O8With NaHSO3Matched
The composite solution and 90g AIBN that manufactured concentration is 1% are added in reaction kettle, at a temperature of the revolving speed of 60r/min, 30 DEG C
Logical N2Stir 30min.Stop logical N2, rapidly that reaction kettle is closed, after reacting 3.5h at 30 DEG C, adjusting reaction temperature is 50 DEG C,
Continue to stand reaction 2h, obtains clear gum product.
By jelly in 60 DEG C of baking ovens 48h, and dry solid is crushed to get powdery CPAM is arrived.
The molecular weight product is about 1.1 × 106。
Embodiment 1
By 5kg CPAM, 1kg CaCl2, 3kg polyethylene glycol -200,2kg lauryl sodium sulfate and 89kg tap water
It is added in 200L reaction kettle, dissolution is uniformly mixed under agitation, obtains the haze inhibitor.
Embodiment 2
By 7kg CPAM, 2kg CaCl2, 4kg glycerine, 1kg dodecyl sodium sulfate and 86kg tap water be added to
In 200L reaction kettle, dissolution is uniformly mixed under agitation, obtains the haze inhibitor.
Embodiment 3
By 5kg CPAM, 1kg Ca (NO3)2, 3kg propylene glycol, 2kg lauryl sodium sulfate and 89kg tap water be added
Into 200L reaction kettle, dissolution is uniformly mixed under agitation, obtains the haze inhibitor.
Embodiment 4
5kg CPAM, 1kg calcium formate, 2kg sodium polycarboxylate, 2kg lauryl sodium sulfate and 90kg tap water are added
Into 200L reaction kettle, dissolution is uniformly mixed under agitation, obtains the haze inhibitor.
The resulting haze inhibitor solution of above embodiments is added in tap water with 5~8%, it after mixing, will
It is sprayed on the ground, more than the still aobvious humidity in rear ground for 24 hours, is trickled down the dust on and is no longer flown again in Hairdryer
It raises, ground substantially dry after 48h, dust reunites condensation as bulky grain at this time, does not also fly upward again in Hairdryer, clearly
It is clean to sweep rear road surface, no dust.
Not plus in the parallel test of haze inhibitor, ground has just been dried after 3h, trickles down the dust in hair dryer
It is flown upward again when blowing.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of haze inhibitor, which is characterized in that according to mass percent include following component: 5~10% cation is poly-
Acrylamide, 1~5% calcium salt, 3~5% polyalcohol gather polynary hydrochlorate, and 1~5% bleeding agent, remaining group is divided into water；
The bleeding agent is lauryl sodium sulfate or dodecyl sodium sulfate；
The polyalcohol gathers polynary hydrochlorate for any one in polyethylene glycol -200, glycerine, propylene glycol and sodium polycarboxylate；
The calcium salt is calcium chloride, calcium nitrate, any one or a variety of any combination in calcium acetate.
2. haze inhibitor as described in claim 1, which is characterized in that the cationic polyacrylamide is by acrylamide
It is synthesized under the conditions of initiator is added with methacryloxypropyl vinyl trimethyl ammonium chloride.
3. haze inhibitor as claimed in claim 2, which is characterized in that the synthesis side of the cationic polyacrylamide
Method, comprising the following steps:
A, in the reaction kettle equipped with blender, thermometer, reflux condenser and gas conduit, the acryloyl of design flow is added
Amine, methacryloxypropyl vinyl trimethyl ammonium chloride, urea, disodium ethylene diamine tetraacetate and deionized water, in 50~80r/
Under the revolving speed of min, lead to N2Stir 25~35min；
B, the redox initiator of metering is configured to 0.5~2% aqueous solution, is added in reaction kettle, while being added one
Quantitative azodiisobutyronitrile；Reaction temperature is risen to 25~35 DEG C, under the revolving speed of 50~100r/min, leads to N2Stirring 25~
35min；
C, stop being passed through N2, rapidly that reaction kettle is closed, after reacting 3~4h at 25~35 DEG C, adjusting reaction temperature is 45~55
DEG C, continue to stand 1.5~2.5h of reaction, obtains clear gum product；By jelly in 55~65 DEG C of baking ovens 40~60h, and
Dry solid is crushed to get powdery CPAM is arrived.
4. haze inhibitor as claimed in claim 2, which is characterized in that in the step A, acrylamide and metering system
The mass ratio of acyl-oxygen vinyl trimethyl ammonium chloride is (3~4): 1.
5. haze inhibitor as claimed in claim 3, which is characterized in that in the step B, the Redox Initiator
Agent is (NH4)2S2O8And NaHSO3Mixture, (NH4)2S2O8And NaHSO3Mass ratio be more preferably 1:1.
6. haze inhibitor as claimed in claim 3, which is characterized in that the preparation method of the haze inhibitor, including
Following steps: will be added the water measured and cationic polyacrylamide in the container with stirring, and 25~35min of stirring is molten
Xie Hou sequentially adds bleeding agent, calcium salt and polyalcohol under agitation or gathers polynary hydrochlorate, obtains institute after mixing
The haze inhibitor stated.
7. haze inhibitor as claimed in claim 6, which is characterized in that the haze inhibitor, according to 5~10% ratios
It is added in sprinkling truck water pot, sprinkles water according to normal condition to road surface after adding water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710244325.8A CN107033846B (en) | 2017-04-14 | 2017-04-14 | A kind of haze inhibitor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710244325.8A CN107033846B (en) | 2017-04-14 | 2017-04-14 | A kind of haze inhibitor and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107033846A CN107033846A (en) | 2017-08-11 |
| CN107033846B true CN107033846B (en) | 2019-07-23 |
Family
ID=59535265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710244325.8A Active CN107033846B (en) | 2017-04-14 | 2017-04-14 | A kind of haze inhibitor and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107033846B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107761644B (en) * | 2017-09-26 | 2019-02-22 | 长沙义和车桥有限公司 | A kind of intelligent water sprinkling vehicle and its tank body |
| CN109181646B (en) * | 2018-11-06 | 2021-02-26 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Dust suppressant for coal-fired power plant for promoting fine particle agglomeration |
| CN109621598A (en) * | 2018-12-17 | 2019-04-16 | 孙孝成 | Air purifying preparation and preparation method thereof |
| CN111500260A (en) * | 2020-04-20 | 2020-08-07 | 山东理工大学 | Thickening efficient foam dust-settling agent for coal mine excavation face |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101372524A (en) * | 2008-10-17 | 2009-02-25 | 四川通丰科技有限公司 | Process for producing cation polyacrylamide |
| CN102660227A (en) * | 2012-05-02 | 2012-09-12 | 山西兆益矿用材料有限公司 | Road dust suppressant |
| CN104817997A (en) * | 2015-03-30 | 2015-08-05 | 内蒙古博冉科技有限责任公司 | Solid dust suppressant |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6790245B2 (en) * | 2002-10-07 | 2004-09-14 | Benetech, Inc. | Control of dust |
-
2017
- 2017-04-14 CN CN201710244325.8A patent/CN107033846B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101372524A (en) * | 2008-10-17 | 2009-02-25 | 四川通丰科技有限公司 | Process for producing cation polyacrylamide |
| CN102660227A (en) * | 2012-05-02 | 2012-09-12 | 山西兆益矿用材料有限公司 | Road dust suppressant |
| CN104817997A (en) * | 2015-03-30 | 2015-08-05 | 内蒙古博冉科技有限责任公司 | Solid dust suppressant |
Non-Patent Citations (1)
| Title |
|---|
| 阳离子聚丙烯酰胺合成工艺条件及絮凝性能的研究;余先巍，等;《化学研究与应用》;20170315;第29卷(第3期);第319-324页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107033846A (en) | 2017-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107033846B (en) | A kind of haze inhibitor and preparation method thereof | |
| CN106957633B (en) | A kind of efficient and environment-friendly type dust suppressant and preparation method thereof, application | |
| CN109415618B (en) | Efficient environment-friendly dust suppressant and preparation method and application thereof | |
| CN111117568B (en) | Ecological dust suppressant for surface mine dust control and preparation method thereof | |
| CN101629065B (en) | Environment protection snow-dissolved agent and preparation method thereof | |
| CN106479101A (en) | A kind of moisture-absorbing moisture-keeping type is combined small particle Fugitive dust inhibiting agent and preparation method thereof | |
| CN104693339B (en) | Water-based dust depressor and preparation method thereof | |
| CN107603564A (en) | A kind of pollution-free road dust inhibitor and its application method | |
| CN106010453A (en) | Dust prevention and suppression agent | |
| CN109054415A (en) | A kind of active snow melt deicing asphalt and preparation method thereof | |
| CN104478320B (en) | A kind of freeze proof habitat base material for extremely frigid zones and preparation method thereof | |
| CN102408872A (en) | Salt-storing deicing material special for asphalt pavement and preparation method thereof | |
| CN103937453B (en) | A kind of inhibitor and preparation and application thereof controlling Domestic Waste Collection fortune process dust pollution | |
| CN104312537B (en) | A kind of construction site dust suppressant and preparation method thereof | |
| CN110373155A (en) | A kind of Road dust suppressant | |
| CN114292625B (en) | Road snow-melting agent and preparation method and application thereof | |
| JP5393714B2 (en) | Freezing inhibitor | |
| CN104322334A (en) | Warm cloud catalyst, preparation method thereof and application thereof | |
| CN114149789A (en) | Dust suppressant for preventing construction raise dust and preparation method thereof | |
| CN109370525B (en) | Dust-settling agent suitable for low-temperature environment and preparation method thereof | |
| JPH032476B2 (en) | ||
| CN107930312B (en) | Natural degradable macromolecular haze-inhibiting spraying agent and preparation method and application thereof | |
| CN106978139A (en) | A kind of lime-ash crustization agent and its preparation method and application | |
| CN111548769A (en) | Environment-friendly dust fixing agent and preparation and use methods thereof | |
| CN113308226B (en) | Pavement humectant and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210727 Address after: 610072 No. 31, Xi'an North Road, Jinniu District, Chengdu, Sichuan Patentee after: SICHUAN WAN'AN DENDROBIUM INDUSTRY DEVELOPMENT Co.,Ltd. Address before: 610072 No. 2, Xi'an North Road, Jinniu District, Chengdu, Sichuan Patentee before: SICHUAN TONGFENG TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |