CN105361241A - Cigarette binary composite filter tip filled with graphene oxide and preparation method of cigarette binary composite filter tip - Google Patents
Cigarette binary composite filter tip filled with graphene oxide and preparation method of cigarette binary composite filter tip Download PDFInfo
- Publication number
- CN105361241A CN105361241A CN201510819317.2A CN201510819317A CN105361241A CN 105361241 A CN105361241 A CN 105361241A CN 201510819317 A CN201510819317 A CN 201510819317A CN 105361241 A CN105361241 A CN 105361241A
- Authority
- CN
- China
- Prior art keywords
- filter tip
- graphene oxide
- cigarette
- filled
- preparation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Abstract
The invention discloses a cigarette binary composite filter tip filled with graphene oxide and a preparation method of the cigarette binary composite filter tip. The cigarette binary composite filter tip is filled with graphene oxide dispersion liquid prepared by adopting an improved Hummers method, wherein the concentration of the graphene oxide dispersion liquid is 0.2mg/ml-1mg/ml, and the dropwise adding amount is 0.3ml-1ml. According to the invention, the rapid preparation of the composite filter tip based on graphene oxide is realized, the original cigarette structure is not changed, the producing and processing are convenient, the content of phenolic compounds in the main stream smoke of the cigarette can be effectively and selectively reduced, and the content of phenol can be reduced by 100% to the maximum.
Description
Technical field
The present invention relates to a kind of cigarette binary combined filter tip being filled with graphene oxide and preparation method thereof.
Background technology
At present, that makes great efforts raising cigarette sucks the common recognition that security has become domestic and international tobacco business, in order to reduce the carcinogenic harmful components such as phenol in cigarette mainstream flue gas, hydrogen cyanide and aldoketones, wherein, cigarette filter rod is a very important bridge between tobacco smokers and cigarette, its can part harmful components in effectively catching main flume, and reduce the harm of flue gas to health and environment, the cigarette filter rod overwhelming majority used on the market is at present vinegar fine filter stick, propene fibre filter stick and paper filter stick.Recent study personnel are also mainly devoted to add various active material in cigarette filter rod and carry out physical and chemical adsorption to above-mentioned releaser, as adopted the fibrous material etc. of NACF, sepiolite fibre, ion-exchange fibre, metal or doped metallic oxide.Although these methods decrease the releaser in cigarette mainstream flue gas to a certain extent, but that is really applied is less, because there is infringement former in most of material, with high costs, introduce impurity and peculiar smell, change the problems such as cigarette smoking local flavor, in addition, these conventional polymer materials or metal-modified material are also because itself has poor selectivity, polarity is low, defects such as active conjugation site is few and being restricted, nearest rise to expanded offal, tealeaves, the natural plant materials such as Chinese herbal medicine are used for the research of cigarette filter rod reducing tar and reducing harm, mainly utilize the loose porous property of its structure to retain absorption flue gas, but these pore structures mostly are airtight cavity structure, lower to the filter efficiency of harmful substances from flue gases, equally also constrain the application of these filtering materials in Chinese-style cigarette.
Summary of the invention
The technical problem to be solved in the present invention be the filter efficiency of existing cigarette filter rod on the harmful substance in flue gas low, with high costs, affect cigarette smoking local flavor.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of cigarette binary combined filter tip being filled with graphene oxide, it is characterized in that: in described cigarette filter, homogeneous impregnation has the graphene oxide dispersion adopting the Hummers legal system of improvement standby, the concentration of described graphene oxide dispersion is 0.2mg/ml-1mg/ml, and dripping quantity is 0.3ml-1ml.
Graphene oxide (grapheneoxide) is the oxide of Graphene, and after oxidation, its surface oxygen functional group increases and makes character comparatively Graphene is more active.In addition, graphene oxide is regarded as hydroaropic substance for a long time, and thus it has superior dispersiveness in water, but, related experiment result shows, and in fact graphene oxide has amphipathic, and presents hydrophilic to hydrophobic property distribution from graphene platelet edge to central authorities.Therefore, graphene oxide can as interfacial agent Presence of an interface, and reduce the energy between interface.After oxidation processes, graphite oxide still keeps the layer structure of graphite, but introduces abundant hydroxyl, carboxyl and carbon and oxygen functional group on the Graphene monolithic of every one deck, and easy and hydroxyl, amino, carboxyl isopolarity group form hydrogen bond.In addition, material with carbon element itself has the features such as good absorption property, aseptic nontoxic, heat resistance.The present invention adopts graphene oxide dispersion to fill filter tip, while reaching filtering out harmful matter effect, also ensure that the mouthfeel of sucking is unaffected, higher than the graphene oxide dispersion the highest consumption that the present invention adopts, smoking property of cigarette mouthfeel can be affected, and Long-Time Service, the side effect of toxic human body, and lower than minimum amount of the present invention, effectively cannot play filter effect.
Be filled with a preparation method for the cigarette binary combined filter tip of graphene oxide, the concrete steps of described method are as follows: 1) prepare graphene oxide dispersion, dispersion liquid concentration is 0.2mg/ml-1mg/ml; 2) graphene oxide dispersion evenly dropped on commercial cigarettes filter tip, dripping quantity is 0.3ml-1ml, keep after dipping cigarette under, filter tip is at upper 15min-60min; 3) constant temperature drying 2-4h at filter tip being placed in 35-60 DEG C, obtains the binary combined filter tip being filled with graphene oxide; 4) 12-24h in air is left standstill by obtaining filter tip after oven dry.
Dipping after keep cigarette under, filter tip at upper 15min-60min, fully can meet the infiltration of filter tip to dispersion liquid and the effect of absorption.Constant temperature drying 2-4h at filter tip is placed in 35-60 DEG C, both can not be too high because of the temperature of drying, and destroys the mouthfeel of pipe tobacco, also can not be too low because of temperature, causes the inefficiency of drying.Leave standstill 12-24h in air by obtaining filter tip after oven dry, the effect played is moisture regain, ensures that cigarette can not cause because of too dry after oven dry the problem that burning is too fast, mouthfeel runs off.Graphene oxide as additive application in cigarette filter rod, effective selectivity can be reduced content of phenolic compounds in cigarette mainstream flue gas by the present invention, graphene oxide is added on after in cigarette filter rod and does not change the loose porous structure of former filter stick, the fiber of graphene oxide lamellar structure well and in filter stick is combined togather, numerous oxygen-containing functional groups that lamella is implanted are utilized effectively to adsorb the materials such as tar on the one hand, the porous of acetate fiber inside is coordinated to serve the effect of filtering and retaining flue gas, the heat-proof quality that simultaneous oxidation Graphene is outstanding and stability, the temperature that flue gas enters oral cavity can be reduced, especially when cigarette burns and sucks close to filter tip, can provide more comfortable, calm suction impression, in addition, graphene oxide cost is lower, abundance, prepare approach various, be easy to realize suitability for industrialized production, there is good prospects for commercial application.
Further, described graphene oxide dispersion adopts the Hummers legal system improved standby.This kind of method is adopted to make dispersion liquid cost low, effective.
Preferably, keep in step 2 cigarette under, filter tip is 20min-40min in the upper time.
Preferably, the temperature that in step 3, filter tip is dried is 40-60 DEG C.
Advantage of the present invention is: the present invention is directed to the deficiencies in the prior art, the present invention is to mix graphene oxide filter stick for carrier, utilize the high surface reaction activity of graphene oxide, the character such as strong adsorptivity, effective selectivity reduces content of phenolic compounds in cigarette mainstream flue gas, and this additive raw material is simple and easy to get, and it is convenient to implement, and safety non-toxic, remain that cigarette is original sucks local flavor to the full extent.
Accompanying drawing explanation
Fig. 1 is filamentary structure arrangement schematic diagram in commercial Cigarette filter tip SEM.
Fig. 2 is filamentary structure arrangement schematic diagram in Cigarette filter tip SEM of the present invention.
Fig. 3 is that commercial cigarette tests with reference to tobacco business standard YC/T255-2008 the main flume high-efficient liquid phase chromatogram (blank sample) obtained.
Fig. 4 is that the present invention tests with reference to tobacco business standard YC/T255-2008 the main flume high-efficient liquid phase chromatogram obtained.
Fig. 5 is the operation chart of the inventive method.
Detailed description of the invention
As shown in Figure 1-2, before not adulterating, in filter tip, filamentary structure arrangement is comparatively orderly, and fiber surface is smoother, seldom has material to adhere to.After doping, find that there is and laminar structuredly wrapped up above-mentioned fibre structure, in test process, find that this structure appears in large area.Illustrate that obtained binary combined filter tip reaches good effect on a microscopic scale.
As shown in Figure 3-4, record when actual retention time is 28.91min with reference to tobacco business standard YC/T255-2008 and occur phenol characteristic absorption peak, be not difficult to find, when in blank sample high-efficient liquid phase chromatogram, retention time is 28.92min, peak area is 8.1697mAUmin, the computational methods provided through tobacco business standard YC/T255-2008 after converting corresponding single Zhi Putong filter tip filter after the content of phenol in main flume, and peak area is 0.0103mAUmin when in graphite oxide thiazolinyl binary combined filter tip cigarette high-efficient liquid phase chromatogram, retention time is 28.99min, after the computational methods provided through tobacco business standard YC/T255-2008 convert corresponding single graphite oxide thiazolinyl binary combined filter tip filter after the content of phenol in main flume, phenol content have dropped 99.87%, close to whole filtering.Graphite oxide thiazolinyl binary combined filter tip of the present invention is that in openly reporting at present, selective absorption removal phenol effect is best.
With commercial natural graphite flakes and certain Chinese-style cigarette brand for raw material, adopt the Hummers legal system improved for graphene oxide, prepare certain density graphene oxide suspension, with the filter tip of Chinese-style cigarette for carrier, above-mentioned graphene oxide solution carefully, is evenly dropped on commercial cigarettes filter tip, dipping after keep cigarette under, filter tip at upper 20-40min to reach best infiltration-adsorption effect; Then constant temperature drying 2h-4h at being placed in 40-60 DEG C, obtains the cigarette sample including graphite oxide thiazolinyl binary combined filter tip, put afterwards in atmosphere 12-24h with similar regular-size cigarette.The concrete steps of described method are as follows:
(1) adopt the Hummers legal system of existing improvement for graphene oxide, the graphene oxide deionized water taking certain mass soaks 12h, be ultrasonic 1-5 hour under room temperature in the Vltrasonic device of 100W at power, obtain finely dispersed graphene oxide suspension;
(2) get the above-mentioned graphene oxide solution of 0.3-1ml carefully, evenly to drop on commercial cigarettes filter tip, dipping after keep cigarette under, filter tip at upper 20min-40min to reach best infiltration-adsorption effect;
(3) constant temperature drying 2-4h at being then placed in 40-60 DEG C, obtains the binary combined filter tip being filled with graphene oxide, puts 12-24h in atmosphere afterwards and namely obtains the binary combined filter tip cigarette being filled with graphene oxide.
With instantiation, technical scheme of the present invention is described below, but protection scope of the present invention is not limited thereto:
The graphene oxide used in the present invention is standby by the Hummers legal system improved.
Embodiment 1
The concrete steps of the preparation method of the cigarette sample of graphite oxide thiazolinyl binary combined filter tip are as follows:
(1) take 0.05g graphite oxide 50ml deionized water and soak 12h, be in the Vltrasonic device of 100W under room temperature ultrasonic 2 hours at power, obtain the graphene oxide suspension that finely dispersed concentration is 1mg/ml;
(2) get the above-mentioned graphene oxide solution of 1ml carefully, evenly to drop on commercial cigarettes filter tip, keep after dipping cigarette under, filter tip carries out permeating-adsorbing at upper 15min;
(3) constant temperature drying 2h at being then placed in 60 DEG C, obtains the binary combined filter tip being filled with graphene oxide, puts 12h in atmosphere afterwards and namely obtains the binary combined filter tip cigarette being filled with graphene oxide.
In the binary combined filter tip that this embodiment prepares, graphene oxide content is few, preparation cost is cheap, 30% of not enough preparation cost of the prior art, but can in filtering main flume more than 99.8% phenol nuisance, in addition, dispersion liquid dipping effect in filter tip is up to standard, and the mouthfeel of sucking for cigarette does not affect.
Embodiment 2
(1) take 0.025g graphite oxide 50ml deionized water and soak 12h, be in the Vltrasonic device of 100W under room temperature ultrasonic 2 hours at power, obtain the graphene oxide suspension that finely dispersed concentration is 0.5mg/ml;
(2) get the above-mentioned graphene oxide solution of 0.3ml carefully, evenly to drop on commercial cigarettes filter tip, keep after dipping cigarette under, filter tip carries out permeating-adsorbing at upper 20min;
(3) constant temperature drying 3h at being then placed in 40 DEG C, obtains the binary combined filter tip being filled with graphene oxide, puts 12h in atmosphere afterwards and namely obtains the binary combined filter tip cigarette being filled with graphene oxide.
In the binary combined filter tip that this embodiment prepares, graphene oxide content is less than embodiment 1, preparation cost is cheaper, but can in filtering main flume more than 99.7% phenol nuisance, in addition, dispersion liquid dipping effect in filter tip is better, keeps cigarette to suck mouthfeel preferably.
Embodiment 3
(1) take 0.01g graphite oxide 50ml deionized water and soak 12h, be in the Vltrasonic device of 100W under room temperature ultrasonic 2 hours at power, obtain the graphene oxide suspension that finely dispersed concentration is 0.2mg/ml;
(2) get the above-mentioned graphene oxide solution of 0.5ml carefully, evenly to drop on commercial cigarettes filter tip, keep after dipping cigarette under, filter tip carries out permeating-adsorbing at upper 60min;
(3) constant temperature drying 2h at being then placed in 60 DEG C, obtains the binary combined filter tip being filled with graphene oxide, puts 20h in atmosphere afterwards and namely obtains the binary combined filter tip cigarette being filled with graphene oxide.
In the binary combined filter tip that this embodiment prepares, graphene oxide content is less than embodiment 2, preparation cost is lower than embodiment 2, but can in filtering main flume more than 99.5% phenol nuisance, because the temperature of drying is higher, the speed ratio embodiment 1 of curing and the high 10%-20% of embodiment 2, after having dried, moisture regain 20h, makes the pipe tobacco in cigarette reply the state of normally sucking, in addition, dispersion liquid dipping effect in filter tip is very good, and smoking property of cigarette mouthfeel is good.
Embodiment 4
(1) take 0.025g graphite oxide 50ml deionized water and soak 12h, be in the Vltrasonic device of 100W under room temperature ultrasonic 2 hours at power, obtain the graphene oxide suspension that finely dispersed concentration is 0.5mg/ml;
(2) get the above-mentioned graphene oxide solution of 1ml carefully, evenly to drop on commercial cigarettes filter tip, keep after dipping cigarette under, filter tip carries out permeating-adsorbing at upper 40min;
(3) constant temperature drying 4h at being then placed in 35 DEG C, obtains the binary combined filter tip being filled with graphene oxide, puts 24h in atmosphere afterwards and namely obtains the binary combined filter tip cigarette being filled with graphene oxide.
In the binary combined filter tip that this embodiment prepares, graphene oxide content is rare, preparation cost is extremely low, but can in filtering main flume more than 99.3% phenol nuisance, in addition, because the temperature of drying is low, the time of moisture regain is long, therefore, cigarette suck mouthfeel comparatively before several embodiment better.
As shown in Figure 5, filter tip of the present invention combines binary combined filter tip by cellulose acetate filter rod section doped with graphene oxide, namely in filter tip, homogeneous impregnation has the graphene oxide dispersion adopting the Hummers legal system of improvement standby, the concentration of described graphene oxide dispersion is 0.2mg/ml-1mg/ml, and dripping quantity is 0.3ml-1ml.
Cigarette mainstream flue gas is when by this binary combined filter tip, and graphene oxide particle can adsorb the harmful substances such as phenols wherein, as phenol, and orthoresol, metacresol, paracresol etc.The professional standard YC/T255-2008 test of promulgating with reference to State Tobacco Monopoly Bureau shows, this composite filter tip is the highest by nearly 100% to phenol clearance in main flume, effectively controls in a large amount of harmful substance suction body, alleviates the health hazard to smoking property of cigarette person.
Claims (5)
1. one kind is filled with the cigarette binary combined filter tip of graphene oxide, it is characterized in that: in described cigarette filter, homogeneous impregnation has the graphene oxide dispersion adopting the Hummers legal system of improvement standby, the concentration of described graphene oxide dispersion is 0.2mg/ml-1mg/ml, and dripping quantity is 0.3ml-1ml.
2. adopt claim 1 one kind to be filled with the preparation method of the cigarette binary combined filter tip of graphene oxide, it is characterized in that the concrete steps of described method are as follows:
1) prepare graphene oxide dispersion, dispersion liquid concentration is 0.2mg/ml-1mg/ml;
2) graphene oxide dispersion evenly dropped on commercial cigarettes filter tip, dripping quantity is 0.3ml-1ml, keep after dipping cigarette under, filter tip is at upper 15min-60min;
3) constant temperature drying 2-4h at filter tip being placed in 35-60 DEG C, obtains the binary combined filter tip being filled with graphene oxide;
4) 12-24h in air is left standstill by obtaining filter tip after oven dry.
3. a kind of preparation method being filled with the cigarette binary combined filter tip of graphene oxide according to claim 2, is characterized in that: described graphene oxide dispersion adopts the Hummers legal system improved standby.
4. a kind of preparation method being filled with the cigarette binary combined filter tip of graphene oxide according to Claims 2 or 3, is characterized in that: keep in step 2 cigarette under, filter tip is 20min-40min in the upper time.
5. a kind of preparation method being filled with the cigarette binary combined filter tip of graphene oxide according to Claims 2 or 3, is characterized in that: the temperature that in step 3, filter tip is dried is 40-60 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510819317.2A CN105361241B (en) | 2015-11-20 | 2015-11-20 | A kind of cigarette binary combined filter tip and preparation method thereof filled with graphene oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510819317.2A CN105361241B (en) | 2015-11-20 | 2015-11-20 | A kind of cigarette binary combined filter tip and preparation method thereof filled with graphene oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105361241A true CN105361241A (en) | 2016-03-02 |
| CN105361241B CN105361241B (en) | 2019-07-12 |
Family
ID=55364326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510819317.2A Active CN105361241B (en) | 2015-11-20 | 2015-11-20 | A kind of cigarette binary combined filter tip and preparation method thereof filled with graphene oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105361241B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109476488A (en) * | 2016-04-29 | 2019-03-15 | 对数9物质科学私人有限公司 | A kind of graphene-based tobacco smog filte r and a kind of method of synthesizing graphite alkene compound |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103005712A (en) * | 2013-01-04 | 2013-04-03 | 江苏中烟工业有限责任公司 | Grapheme type fiber cigarette filter and preparation method thereof |
| CN104389234A (en) * | 2014-09-12 | 2015-03-04 | 河南中烟工业有限责任公司 | Cigarette filter tip added with chitosan-graphene oxide composite material |
| CN204444224U (en) * | 2015-01-30 | 2015-07-08 | 河南中烟工业有限责任公司 | Add the cigarette filter rod that load has the filter disc of graphene oxide |
| CN204444225U (en) * | 2015-01-30 | 2015-07-08 | 河南中烟工业有限责任公司 | Add the cigarette filter rod that load has the filter screen of graphene oxide |
| CN104815630A (en) * | 2015-04-22 | 2015-08-05 | 武汉纺织大学 | Preparation method of filter tip fibers for selectively adsorbing benzopyrene and phenol |
| CN105029694A (en) * | 2015-08-11 | 2015-11-11 | 广西中烟工业有限责任公司 | Harm-reducing type ternary composite filter rod containing graphene oxide particles |
-
2015
- 2015-11-20 CN CN201510819317.2A patent/CN105361241B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103005712A (en) * | 2013-01-04 | 2013-04-03 | 江苏中烟工业有限责任公司 | Grapheme type fiber cigarette filter and preparation method thereof |
| CN104389234A (en) * | 2014-09-12 | 2015-03-04 | 河南中烟工业有限责任公司 | Cigarette filter tip added with chitosan-graphene oxide composite material |
| CN204444224U (en) * | 2015-01-30 | 2015-07-08 | 河南中烟工业有限责任公司 | Add the cigarette filter rod that load has the filter disc of graphene oxide |
| CN204444225U (en) * | 2015-01-30 | 2015-07-08 | 河南中烟工业有限责任公司 | Add the cigarette filter rod that load has the filter screen of graphene oxide |
| CN104815630A (en) * | 2015-04-22 | 2015-08-05 | 武汉纺织大学 | Preparation method of filter tip fibers for selectively adsorbing benzopyrene and phenol |
| CN105029694A (en) * | 2015-08-11 | 2015-11-11 | 广西中烟工业有限责任公司 | Harm-reducing type ternary composite filter rod containing graphene oxide particles |
Non-Patent Citations (2)
| Title |
|---|
| 盛金 等: "氧化石墨烯改性活性炭纤维滤除卷烟主流烟气的释放物", 《分析测试学报》 * |
| 高明奇 等: "负载氧化石墨烯纤维素纸在滤棒中的应用研究", 《纸和造纸》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109476488A (en) * | 2016-04-29 | 2019-03-15 | 对数9物质科学私人有限公司 | A kind of graphene-based tobacco smog filte r and a kind of method of synthesizing graphite alkene compound |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105361241B (en) | 2019-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6790095B2 (en) | Graphene adsorbent, its manufacturing method and its application, and tobacco filter and tobacco | |
| US7503960B2 (en) | Smoking articles and filters with carbon fiber composite molecular sieve sorbent | |
| CN204444225U (en) | Add the cigarette filter rod that load has the filter screen of graphene oxide | |
| CN206923661U (en) | A kind of cigarette filter | |
| CN102823946B (en) | Cigarette filter additive and application thereof | |
| CN103431519B (en) | Application of high content of epoxy group polyethylene glycidyl methacrylate interconnected porous materials in cigarettes | |
| CN107951070A (en) | A kind of composite cigarette filter and preparation method thereof and a kind of cigarette | |
| CN101947435B (en) | Chitosan polycation additive for reducing phenols in cigarette smoke | |
| CN107758663A (en) | Porous charcoal and its production method | |
| CN105597675A (en) | Graphene adsorbing material, preparation method and application thereof and cigarette filter tip | |
| US20230404135A1 (en) | Environment-friendly wrapping-free heat-not-burn naked tobacco product | |
| CN102849718A (en) | Porous carbon preparation | |
| CN204444224U (en) | Add the cigarette filter rod that load has the filter disc of graphene oxide | |
| KR20050083035A (en) | Filter composition of filter cigarette | |
| CN110680010A (en) | Magnolia bark gel bead for cigarettes and preparation method thereof | |
| CN105361241A (en) | Cigarette binary composite filter tip filled with graphene oxide and preparation method of cigarette binary composite filter tip | |
| CN104695059A (en) | Preparation method of lignin-based activated carbon fiber with large specific surface area | |
| CN102719923A (en) | Production method of bamboo coal cellulose diacetate tow | |
| CN103141940A (en) | Entrapment agent for selectively lowering crotonaldehyde content in cigarette smoke and filter stick | |
| CN102613702A (en) | Filter cigarette capable of reducing suction volume of cigarette tar | |
| CN202536099U (en) | Cigarette composite filter tip rod | |
| CN202941404U (en) | Ternary composite filter tip of activated carbon fibre | |
| CN204861143U (en) | Ternary cigarette filter | |
| CN213127989U (en) | Heating cigarette capable of improving smoking stability and heat utilization rate | |
| CN112645324B (en) | Porous carbon composite material with core-shell structure and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |