CN108837807A - A kind of material for air purification and preparation method thereof for atmosphere pollution - Google Patents
A kind of material for air purification and preparation method thereof for atmosphere pollution Download PDFInfo
- Publication number
- CN108837807A CN108837807A CN201810677417.XA CN201810677417A CN108837807A CN 108837807 A CN108837807 A CN 108837807A CN 201810677417 A CN201810677417 A CN 201810677417A CN 108837807 A CN108837807 A CN 108837807A
- Authority
- CN
- China
- Prior art keywords
- added
- taken
- sawdust
- hours
- atmosphere pollution
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Catalysts (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of material for air purification for atmosphere pollution, it is made of the raw material of following kinds of parts by weight：Modified wood chips 20-30, attapulgite 60-70, trimethylolpropane 3-4, stearic acid 1-2, catalyst 0.1-0.2, diacetone alcohol 2-4, glyceryl tristearate 0.8-1, oleic acid diethyl amide 0.8-1, aluminium isopropoxide 10-15, material Safety and Environmental Protection of the invention is good, strong adsorption, it is handled particularly suitable as atmosphere pollution, comprehensive performance is superior.
Description
Technical field
The invention belongs to environment protection fields, and in particular to a kind of for the material for air purification of atmosphere pollution and its preparation side
Method.
Background technique
With the development of modern industry, atmosphere pollution is increasingly severe, and many countries have formulated environmental pollution method, and corresponding
Ground establishes various purification facilities, but atmosphere pollution still has.Due to family life facility, smoking etc., one is also generated
A little harmful substances pollute room air.The pollution that this indoor and outdoor combines significantly affects the health of people, because
This, countries in the world are all using Industrial cleaning facility and home interior purification as the important subject of control environmental pollution, existing sky
Gas filtering material is mostly non-woven cloth or film filtering, and function is only dedusting.That there was only minority on the market at present utilizes activity
The air filting material that charcoal, web combine makes it have the function of sterilization and absorption.But such filtering material will carry out
Needle thorn is compound and sterilization arranges etc., not only complex process, but also production cost is higher.And its filtering function can be with multiple
Cleaning is reduced and is disappeared quickly, and recycling rate of waterused is low, and some also will cause secondary pollution.
Summary of the invention
In view of the defects and deficiencies of the prior art, the present invention intends to provide a kind of air for atmosphere pollution is net
Change material and preparation method thereof.
To achieve the above object, the present invention uses following technical scheme：
A kind of material for air purification for atmosphere pollution, which is characterized in that it is by the raw material group of following kinds of parts by weight
At：
Modified wood chips 20-30, attapulgite 60-70, trimethylolpropane 3-4, stearic acid 1-2, catalyst 0.1-0.2,
Diacetone alcohol 2-4, glyceryl tristearate 0.8-1, oleic acid diethyl amide 0.8-1, aluminium isopropoxide 10-15.
The modified wood chips are made of the raw material of following weight parts：
Azodicarbonamide 0.7-1, sawdust 10-13, water and zinc borate 2-5, maleic anhydride 3-5, sp-800.1-0.2.
The preparation method of the modified wood chips, includes the following steps：
(1) azodicarbonamide is taken, is added in the chloroform of 3-4 times of its weight, stirs evenly, obtain chloroformic solution；
(2) sawdust is taken, is sent in the hydrochloric acid solution of 0.4-1mol/l, is impregnated 1-2 hours, is filtered, precipitating is washed, mill
It at fine powder, is mixed with water and zinc borate, is added in the deionized water of 6-9 times of mixture weight, stirs evenly, maleic acid is added
Acid anhydride, increasing temperature is 65-70 DEG C, insulated and stirred 30-40 minutes, obtains acidification wood powder；
(3) above-mentioned acidification wood powder is taken, is added in chloroformic solution, stirs evenly, sp-80 is added, it is 4-10 minutes ultrasonic, it steams
Chloroform is removed in distillation, is sent in baking oven, dry 1-2 hour at 55-60 DEG C, discharging cool down to get.
The catalyst is p-methyl benzenesulfonic acid.
A kind of preparation method of the material for air purification for atmosphere pollution, includes the following steps：
(1) attapulgite is taken, is sent in the sodium hydroxide solution that concentration is 0.3-1mol/l, impregnates 1-2 hours, mistake
Precipitating is washed in filter, and air drying is worn into fine powder, mixed with stearic acid, is added to the deionized water of 5-9 times of mixture weight
In, it stirs evenly, oleic acid diethyl amide is added, stirs evenly, obtains amide dispersion liquid；
(2) modified wood chips are taken, are mixed with glyceryl tristearate, the deionized water of 20-30 times of mixture weight is added to
In, insulated and stirred 1-2 hours at 50-55 DEG C, obtain sawdust dispersion liquid；
(3) above-mentioned amide dispersion liquid, the mixing of sawdust dispersion liquid are taken, stirs evenly, aluminium isopropoxide is added, is sent to 30-35
DEG C water bath with thermostatic control in, be stirred to react 4-5 hours, discharging cooling, obtain modified Aluminum sol；
(4) trimethylolpropane is taken, is added in above-mentioned modified Aluminum sol, is stirred evenly, be sent in reaction kettle, be passed through
Nitrogen, adjusting temperature of reaction kettle is 90-95 DEG C, catalyst is added, insulation reaction 3-4 hours, discharging was mixed with remaining each raw material
Close, stir evenly, filter, will precipitating washing, at 60-65 DEG C of vacuum dry 1-2 hours to get.
Advantages of the present invention：
The present invention handles sawdust using maleic anhydride, is then blended, is distributed in aqueous solution with glyceryl tristearate,
Attapulgite is distributed in oleic acid diethyl amide solution again, later again using the composite dispersion liquid as solvent, as isopropanol
The hydrating solution of aluminium, by the hydrolysis process, realize it is effective compatible between attapulgite, sawdust and colloidal sol, to improve
The stability of finished-product material, material Safety and Environmental Protection of the invention is good, strong adsorption, handles particularly suitable as atmosphere pollution,
Comprehensive performance is superior.
Specific embodiment
Embodiment 1
A kind of material for air purification for atmosphere pollution, it is made of the raw material of following kinds of parts by weight：
Modified wood chips 20, attapulgite 60, trimethylolpropane 3, stearic acid 1, catalyst 0.1, diacetone alcohol 2, three are hard
Glycerol 0.8, oleic acid diethyl amide 0.8, aluminium isopropoxide 10.
The modified wood chips are made of the raw material of following weight parts：
Azodicarbonamide 0.7, sawdust 10, water and zinc borate 2, maleic anhydride 3, sp-800.1.
The preparation method of the modified wood chips, includes the following steps：
(1) azodicarbonamide is taken, is added in the chloroform of 3 times of its weight, is stirred evenly, obtain chloroformic solution；
(2) sawdust is taken, is sent in the hydrochloric acid solution of 0.4mol/l, is impregnated 1 hour, is filtered, precipitating is washed, is worn into thin
Powder is mixed with water and zinc borate, is added in 6 times of mixture weight of deionized water, is stirred evenly, and maleic anhydride is added, and is risen
High-temperature is 65 DEG C, insulated and stirred 30 minutes, obtains acidification wood powder；
(3) above-mentioned acidification wood powder is taken, is added in chloroformic solution, stirs evenly, sp-80, ultrasound 4 minutes, distillation is added
Remove chloroform, be sent in baking oven, dry 1 hour at 55 DEG C, discharging it is cooling to get.
The catalyst is p-methyl benzenesulfonic acid.
A kind of preparation method of the material for air purification for atmosphere pollution, includes the following steps：
(1) attapulgite is taken, is sent in the sodium hydroxide solution that concentration is 0.3mol/l, impregnates 1 hour, filter, it will
Precipitating washing, air drying are worn into fine powder, are mixed with stearic acid, be added in 5 times of mixture weight of deionized water, stir
Uniformly, oleic acid diethyl amide is added, stirs evenly, obtains amide dispersion liquid；
(2) modified wood chips are taken, are mixed with glyceryl tristearate, are added in 20 times of mixture weight of deionized water,
Insulated and stirred 1 hour at 50 DEG C, obtains sawdust dispersion liquid；
(3) above-mentioned amide dispersion liquid, the mixing of sawdust dispersion liquid are taken, stirs evenly, aluminium isopropoxide is added, is sent to 30-35
DEG C water bath with thermostatic control in, be stirred to react 4 hours, discharging cooling, obtain modified Aluminum sol；
(4) trimethylolpropane is taken, is added in above-mentioned modified Aluminum sol, is stirred evenly, be sent in reaction kettle, be passed through
Nitrogen, adjusting temperature of reaction kettle is 90 DEG C, catalyst is added, insulation reaction 3 hours, discharging was mixed with remaining each raw material, stirred
Uniformly, filter, will precipitating washing, at 60 DEG C of vacuum dry 1 hour to get.
Embodiment 2
A kind of material for air purification for atmosphere pollution, it is made of the raw material of following kinds of parts by weight：
Modified wood chips 30, attapulgite 70, trimethylolpropane 4, stearic acid 2, catalyst 0.2, diacetone alcohol 4, three are hard
Glycerol 1, oleic acid diethyl amide 1, aluminium isopropoxide 15.
The modified wood chips are made of the raw material of following weight parts：
Azodicarbonamide 1, sawdust 13, water and zinc borate 5, maleic anhydride 5, sp-800.2.
The preparation method of the modified wood chips, includes the following steps：
(1) azodicarbonamide is taken, is added in the chloroform of 4 times of its weight, is stirred evenly, obtain chloroformic solution；
(2) sawdust is taken, is sent in the hydrochloric acid solution of 1mol/l, is impregnated 2 hours, is filtered, precipitating is washed, is worn into thin
Powder is mixed with water and zinc borate, is added in 9 times of mixture weight of deionized water, is stirred evenly, and maleic anhydride is added, and is risen
High-temperature is 70 DEG C, insulated and stirred 40 minutes, obtains acidification wood powder；
(3) above-mentioned acidification wood powder is taken, is added in chloroformic solution, stirs evenly, sp-80, ultrasound 10 minutes, distillation is added
Remove chloroform, be sent in baking oven, dry 2 hours at 60 DEG C, discharging it is cooling to get.
The catalyst is p-methyl benzenesulfonic acid.
A kind of preparation method of the material for air purification for atmosphere pollution, includes the following steps：
(1) attapulgite is taken, is sent in the sodium hydroxide solution that concentration is 1mol/l, impregnates 1-2 hours, filter, it will
Precipitating washing, air drying are worn into fine powder, are mixed with stearic acid, be added in 9 times of mixture weight of deionized water, stir
Uniformly, oleic acid diethyl amide is added, stirs evenly, obtains amide dispersion liquid；
(2) modified wood chips are taken, are mixed with glyceryl tristearate, the deionized water of 20-30 times of mixture weight is added to
In, insulated and stirred 2 hours at 55 DEG C obtain sawdust dispersion liquid；
(3) above-mentioned amide dispersion liquid, the mixing of sawdust dispersion liquid are taken, stirs evenly, aluminium isopropoxide is added, is sent to 30-35
DEG C water bath with thermostatic control in, be stirred to react 5 hours, discharging cooling, obtain modified Aluminum sol；
(4) trimethylolpropane is taken, is added in above-mentioned modified Aluminum sol, is stirred evenly, be sent in reaction kettle, be passed through
Nitrogen, adjusting temperature of reaction kettle is 95 DEG C, catalyst is added, insulation reaction 4 hours, discharging was mixed with remaining each raw material, stirred
Uniformly, filter, will precipitating washing, at 65 DEG C of vacuum dry 2 hours to get.
Performance test：
It is passed through formaldehyde in 3 Laboratory Modules respectively, so that the concentration of formaldehyde of 3 Laboratory Modules is 5 milligrams/cubic metre；This is sent out
The scavenging material of bright embodiment 1, the scavenging material of embodiment 2, commercially available carbon dust respectively as in 3 Laboratory Modules, Laboratory Module it is big
Small is 30 cubic metres, 1 scavenging material of embodiment, 2 scavenging material of embodiment, commercially available carbon dust dosage be 1kg；Laboratory Module is close
Envelope surveyed the formaldehyde removing rate of each Laboratory Module after 24 hours；
The formaldehyde removing rate for the Laboratory Module that 1 material for air purification of embodiment is placed：96.6%；
The formaldehyde removing rate for the Laboratory Module that 2 material for air purification of embodiment is placed：97.0%；
The formaldehyde removing rate for the Laboratory Module that commercially available carbon dust is placed：60.4%.
Claims (5)
1. a kind of material for air purification for atmosphere pollution, which is characterized in that it is made of the raw material of following kinds of parts by weight
's：
Modified wood chips 20-30, attapulgite 60-70, trimethylolpropane 3-4, stearic acid 1-2, catalyst 0.1-0.2, dipropyl
Keto-alcohol 2-4, glyceryl tristearate 0.8-1, oleic acid diethyl amide 0.8-1, aluminium isopropoxide 10-15.
2. a kind of material for air purification for atmosphere pollution according to claim 1, which is characterized in that the modification
Sawdust is made of the raw material of following weight parts：
Azodicarbonamide 0.7-1, sawdust 10-13, water and zinc borate 2-5, maleic anhydride 3-5, sp-800.1-0.2.
3. a kind of material for air purification for atmosphere pollution according to claim 2, which is characterized in that the modification
The preparation method of sawdust, includes the following steps：
(1) azodicarbonamide is taken, is added in the chloroform of 3-4 times of its weight, stirs evenly, obtain chloroformic solution；
(2) sawdust is taken, is sent in the hydrochloric acid solution of 0.4-1mol/l, is impregnated 1-2 hours, is filtered, precipitating is washed, is worn into thin
Powder is mixed with water and zinc borate, is added in the deionized water of 6-9 times of mixture weight, is stirred evenly, and maleic anhydride is added,
Increasing temperature is 65-70 DEG C, insulated and stirred 30-40 minutes, obtains acidification wood powder；
(3) above-mentioned acidification wood powder is taken, is added in chloroformic solution, stirs evenly, sp-80 is added, 4-10 minutes ultrasonic, distillation removes
Remove chloroform, be sent in baking oven, dry 1-2 hour at 55-60 DEG C, discharging cool down to get.
4. a kind of material for air purification for atmosphere pollution according to claim 1, which is characterized in that the catalysis
Agent is p-methyl benzenesulfonic acid.
5. a kind of preparation method for the material for air purification of atmosphere pollution as described in claim 1, which is characterized in that including
Following steps：
(1) attapulgite is taken, is sent in the sodium hydroxide solution that concentration is 0.3-1mol/l, impregnates 1-2 hours, filter, it will
Precipitating washing, air drying are worn into fine powder, are mixed with stearic acid, be added in the deionized water of 5-9 times of mixture weight, stir
It mixes uniformly, oleic acid diethyl amide is added, stirs evenly, obtains amide dispersion liquid；
(2) modified wood chips are taken, are mixed with glyceryl tristearate, are added in the deionized water of 20-30 times of mixture weight,
Insulated and stirred 1-2 hours at 50-55 DEG C, sawdust dispersion liquid is obtained；
(3) above-mentioned amide dispersion liquid, the mixing of sawdust dispersion liquid are taken, stirs evenly, aluminium isopropoxide is added, is sent to 30-35 DEG C
It in water bath with thermostatic control, is stirred to react 4-5 hours, discharging cooling obtains modified Aluminum sol；
(4) trimethylolpropane is taken, is added in above-mentioned modified Aluminum sol, is stirred evenly, be sent in reaction kettle, be passed through nitrogen
Gas, adjusting temperature of reaction kettle is 90-95 DEG C, and catalyst is added, and insulation reaction 3-4 hours, discharging was mixed with remaining each raw material,
Stir evenly, filter, will precipitating washing, at 60-65 DEG C of vacuum dry 1-2 hours to get.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810677417.XA CN108837807A (en) | 2018-06-27 | 2018-06-27 | A kind of material for air purification and preparation method thereof for atmosphere pollution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810677417.XA CN108837807A (en) | 2018-06-27 | 2018-06-27 | A kind of material for air purification and preparation method thereof for atmosphere pollution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108837807A true CN108837807A (en) | 2018-11-20 |
Family
ID=64202296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810677417.XA Pending CN108837807A (en) | 2018-06-27 | 2018-06-27 | A kind of material for air purification and preparation method thereof for atmosphere pollution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108837807A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007179A (en) * | 2007-01-29 | 2007-08-01 | 谷晨 | Manufacturing method of deodorant card for schoolbag purification |
| CN103495384A (en) * | 2013-08-30 | 2014-01-08 | 蚌埠德美过滤技术有限公司 | Modified activated carbon air purification adsorbent and its preparation method |
| CN106732466A (en) * | 2017-02-27 | 2017-05-31 | 安徽埃克利环境工程有限公司 | A kind of adsorption reaction type formaldehyde eliminating agent and preparation method thereof |
| CN107433185A (en) * | 2017-09-05 | 2017-12-05 | 霍邱金木鱼农业科技有限公司 | A kind of material for air purification and preparation method thereof |
-
2018
- 2018-06-27 CN CN201810677417.XA patent/CN108837807A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007179A (en) * | 2007-01-29 | 2007-08-01 | 谷晨 | Manufacturing method of deodorant card for schoolbag purification |
| CN103495384A (en) * | 2013-08-30 | 2014-01-08 | 蚌埠德美过滤技术有限公司 | Modified activated carbon air purification adsorbent and its preparation method |
| CN106732466A (en) * | 2017-02-27 | 2017-05-31 | 安徽埃克利环境工程有限公司 | A kind of adsorption reaction type formaldehyde eliminating agent and preparation method thereof |
| CN107433185A (en) * | 2017-09-05 | 2017-12-05 | 霍邱金木鱼农业科技有限公司 | A kind of material for air purification and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 宋应华: "《花生壳生物吸附剂的制备及其在含染料废水治理中的应用》", 31 March 2017, 重庆大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105032151B (en) | Air purification method and device | |
| CN107537451A (en) | A kind of porous zeolite material for air purification and preparation method thereof | |
| CN107115843A (en) | A kind of preparation method and applications for coming from peanut shell modified activated carbon | |
| CN103505939B (en) | Medical stone filter core and preparation method thereof | |
| CN107433185A (en) | A kind of material for air purification and preparation method thereof | |
| CN105148856B (en) | Can be except material for air purification of formaldehyde, acetaldehyde, acetic acid and ammonia and preparation method thereof | |
| CN105174859A (en) | Diatomite micropowder-based interior wall paint capable of removing formaldehyde and peculiar smell in indoor air and preparation method thereof | |
| CN104289040A (en) | Air-conditioning active carbon filtration material modified by adding a plurality of components such as silkworm excrement and preparation method of active carbon filtration material | |
| CN102500315A (en) | LiX molecular sieve adsorbent and preparation method thereof | |
| CN112028787A (en) | Beta-hydroxyalkylamide curing agent and preparation method and application thereof | |
| CN103381323B (en) | Porous inorganic microfiltration filter core and preparation method thereof | |
| CN103463870B (en) | Filter core of a kind of filtering noxious gas and preparation method thereof | |
| CN105218017A (en) | Based on diatomite ultrafine powder except formaldehyde in indoor air diatom ooze and preparation method thereof | |
| CN108837807A (en) | A kind of material for air purification and preparation method thereof for atmosphere pollution | |
| CN103830965B (en) | Toughness reinforcing composite ceramic filter core of a kind of monkey grass and preparation method thereof | |
| CN105018244B (en) | A kind of glass curtain wall cleaning agent and preparation method thereof | |
| CN103381319B (en) | Active carbon fiber filter core and preparation method thereof | |
| CN103011365A (en) | Compound phosphorus removing agent for removing low-concentration phosphorus wastewater | |
| CN110078456A (en) | It is a kind of with absorption, the plaster board of photocatalysis performance and its preparation method and application | |
| CN103505941B (en) | Structure filter core and preparation method thereof | |
| CN108745296A (en) | A kind of colloidal sol type material for air purification and preparation method thereof | |
| CN103521001B (en) | A kind of pearlite filter element and preparation method thereof | |
| CN108854985A (en) | A kind of fiber composite adsorbent material and preparation method thereof | |
| CN108786731A (en) | A kind of nanometer micropore material for air purification and preparation method thereof | |
| CN108744716B (en) | Filter screen for efficient air purification device |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181120 |