CN105712325A - Method for stripping graphene - Google Patents
Method for stripping graphene Download PDFInfo
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- CN105712325A CN105712325A CN201410705961.2A CN201410705961A CN105712325A CN 105712325 A CN105712325 A CN 105712325A CN 201410705961 A CN201410705961 A CN 201410705961A CN 105712325 A CN105712325 A CN 105712325A
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Abstract
The invention discloses a method for stripping graphene. The method comprises the following steps: S1) injecting the graphite flakes and a stripper in a kettle with a stirrer, turning on a motor in the kettle for stirring the materials, uniformly mixing the materials, wherein the stripper comprises the following components in parts by weight: 100 parts of an alcohols solvent, 3-20 parts of hydroxy acrylic resin, and 1-5 parts of grinding sand grains. S2) heating the kettle, keeping the temperature of the kettle at 50-80 DEG C, wherein the pressure is 1-3 atm, the rotating speed of a mixer shaft is 1000-2000 rpm/min, and the reaction time is 3-6 hours; S3) stopping the reaction, discharging an upper level fluid suspension to a material collection pot, and standing; S4) conveying a graphene fluid suspension to a centrifuge for centrifuging, after centrifugation is carried out, taking an upper level clear liquid for performing vacuum-filtering to obtain a filter cake; and S5) washing the filter cake, and performing freeze drying on the filter cake. The method used for stripping graphene has the advantages of no corrosion on equipment, and no damage on a structure of graphene.
Description
Technical field
The present invention relates to Graphene production technical field, be specifically related to a kind of Graphene stripping means.
Background technology
Graphene is a kind of two-dimensional material with good flexibility, electrical property.You need to add is that, stricti jurise is said, Graphene is the lamellar of a kind of monolayer；But due to the preparation difficulty of single-layer graphene, generally also the form the few-layer graphene alkene with similar performance is also ranged in the category of Graphene.
At present, the method that prepared by Graphene mainly has: chemically grown method and physics stripping method.Low compared to efficiency, be not suitable for the chemically grown method of industrialized mass production; it is raw material that physics stripping method mainly adopts cheap graphite; make graphite layers peeling-off by graphite crystal is applied mechanical force; break the Van der Waals force of graphite layers; forming monolithic graphite alkene or form the few-layer graphene alkene, this physical separation methods has more industrial prospect and applicable large-scale production.
In Graphene stripping means, it is necessary to add some auxiliary agents to increase the interlayer distance of graphite or so-called intercalation, so that graphite is peeled off better.As adopted nitric acid, potassium permanganate, chromic acid or hydrogen peroxide as oxidant, concentrated sulphuric acid, as intercalator, introduces the oxy radicals such as hydroxyl, epoxide group and carboxyl at graphite layers or edge, increase graphite layers from, be beneficial to follow-up graphite layers and peel off.But this chemical substance intercalated technique acid consumption is big, production process has the pollution of the harmful gass such as SOx, NOx or heavy metal ion, product there is sulfur remain, the Graphene finally given is easily generated defect, and in the application equipment there is is corrosion, reduce the service life of equipment, add production cost.
Summary of the invention
It is an object of the invention to overcome the defect existed in prior art, it is provided that a kind of Graphene stripping means, the method can be efficiently peeled off graphite, and the structural deterioration of Graphene is little.
For realizing the purpose of the present invention, the technical scheme is that a kind of Graphene stripping means, the method comprises the following steps:
S1. by purity more than 98%, particle diameter is that 30 ~ 500 μm of graphite flakes and stripper inject in the kettle with agitator according to the weight ratio of 1:2～5, and the motor starting kettle is stirred, and makes mixing of materials uniform, wherein the consisting of of stripper:
Alcohols solvent 100 parts,
Hydroxylated acrylic resin 3～20 parts,
Frosted grain 1～5 part；
Wherein, each component is in its parts by weight；
S2. heating kettle, keeping still body temperature is 50 DEG C ~ 80 DEG C, and pressure is 1 ~ 3atm, and agitator shaft speed is 1000 ~ 2000rpm/min, response time 3 ~ 6h；
S3. by discharging opening, upper strata suspension is expelled in storage tank after stopped reaction, stands 24h head product derived above；
S4. the graphene suspension in the storage tank obtained by step S3 is delivered in centrifuge, and centrifuge speed is 1000 ~ 6000rpm/min, and centrifugation time 10min ~ 2h takes the supernatant, and in vacuum apparatus, vacuum is filtrated to get filter cake；
S5. filter cake step S4 obtained with appropriate distilled water wash, filter cake more than lyophilization 3h in freeze drying plant, namely obtain graphene product.
Preferred technical scheme is, in step sl, described alcohols solvent is one or more in ethanol, normal propyl alcohol, n-butyl alcohol, propylene glycol and terpineol.
Preferred technical scheme is, in step sl, the particle diameter of described frosted grain is below 5 microns.
It is preferred that technical scheme be that in step sl, described frosted grain is the one in alumina powder, silicon dioxide powder.
Preferred technical scheme is, in step sl, the number-average molecular weight of described Hydroxylated acrylic resin is 10000～20000.
Prior art is compared, and Graphene stripping means of the present invention is by adopting special stripper for the stripping of Graphene, and in this stripper, alcohols solvent shares with Hydroxylated acrylic resin, and they penetrate in graphite flake layer, and form hydrogen bond；In the process of mechanical lapping, the heat of generation or make hydrogen bond destroy by the mode of external heat, thus producing impulsive force to graphite linings；Compared to the stripper not having Hydroxylated acrylic resin, the hydrogen bond action in stripper is weak, and graphite flake layer can not produce the large impact power of orientation, and namely hydrogen bonding sites is played positioning action by the Hydroxylated acrylic resin of long-chain；Additionally, the frosted grain cooperative mechanical added in system is ground, and graphite flake layer can be produced higher shear action；This stripper cooperative mechanical is ground, it is possible to be effectively facilitated the stripping of Graphene.This stripping means is being peeled off while Graphene, and not etching apparatus does not damage graphene-structured.
Detailed description of the invention
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
Embodiment 1
The present invention is a kind of Graphene stripping means, and the method comprises the following steps:
S1. by purity more than 98%, particle diameter is in 30 ~ 500 μm of graphite flakes and the stripper injection kettle with agitator, the motor starting kettle is stirred, make mixing of materials uniform, wherein the consisting of of stripper: propylene glycol 100 parts by weight, Hydroxylated acrylic resin 3 parts by weight, alumina powder 2 parts by weight.The particle diameter of alumina powder is below 5 microns.The number-average molecular weight of Hydroxylated acrylic resin is 10000～20000.The weight ratio of graphite flakes and stripper is 1:2.
S2. heating kettle, keeping still body temperature is 80 DEG C, and pressure is 3atm, and agitator shaft speed is 2000rpm/min, response time 3h.
S3. by discharging opening, upper strata suspension is expelled in storage tank after stopped reaction, stands 24h head product derived above.
S4. the graphene suspension in the storage tank obtained by step S3 is delivered in centrifuge, and centrifuge speed is 6000rpm/min, and centrifugation time 10min takes the supernatant, and in vacuum apparatus, vacuum is filtrated to get filter cake.
S5. filter cake step S4 obtained with appropriate distilled water wash, filter cake more than lyophilization 3h in freeze drying plant, namely obtain graphene product.
Embodiment 2
The present invention is a kind of Graphene stripping means, and the method comprises the following steps:
S1. by purity more than 98%, particle diameter is in 30 ~ 500 μm of graphite flakes and the stripper injection kettle with agitator, the motor starting kettle is stirred, make mixing of materials uniform, wherein the consisting of of stripper: ethanol 50 parts by weight, n-butyl alcohol 50 parts by weight, Hydroxylated acrylic resin 10 parts by weight, alumina powder 4 parts by weight.The particle diameter of alumina powder is below 5 microns.The number-average molecular weight of Hydroxylated acrylic resin is 10000～20000.The weight ratio of graphite flakes and stripper is 1:3.
S2. heating kettle, keeping still body temperature is 50 DEG C, and pressure is 1atm, and agitator shaft speed is 1000rpm/min, response time 6h.
S3. by discharging opening, upper strata suspension is expelled in storage tank after stopped reaction, stands 24h head product derived above.
S4. the graphene suspension in the storage tank obtained by step S3 is delivered in centrifuge, and centrifuge speed is 4000rpm/min, and centrifugation time 20min takes the supernatant, and in vacuum apparatus, vacuum is filtrated to get filter cake.
S5. filter cake step S4 obtained with appropriate distilled water wash, filter cake more than lyophilization 3h in freeze drying plant, namely obtain graphene product.
Embodiment 3
The present invention is a kind of Graphene stripping means, and the method comprises the following steps:
S1. by purity more than 98%, particle diameter is in 30 ~ 500 μm of graphite flakes and the stripper injection kettle with agitator, the motor starting kettle is stirred, make mixing of materials uniform, wherein the consisting of of stripper: terpineol 100 parts by weight, Hydroxylated acrylic resin 20 parts by weight, silica 1 parts by weight.The particle diameter of silicon dioxide is below 5 microns.The number-average molecular weight of Hydroxylated acrylic resin is 10000～20000.The weight ratio of graphite flakes and stripper is 1:4.
S2. heating kettle, keeping still body temperature is 60 DEG C, and pressure is 1.5atm, and agitator shaft speed is 1800rpm/min, response time 5h.
S3. by discharging opening, upper strata suspension is expelled in storage tank after stopped reaction, stands 24h head product derived above.
S4. the graphene suspension in the storage tank obtained by step S3 is delivered in centrifuge, and centrifuge speed is 2000rpm/min, and centrifugation time 1h takes the supernatant, and in vacuum apparatus, vacuum is filtrated to get filter cake.
S5. filter cake step S4 obtained with appropriate distilled water wash, filter cake more than lyophilization 3h in freeze drying plant, namely obtain graphene product.
Embodiment 4
The present invention is a kind of Graphene stripping means, and the method comprises the following steps:
S1. by purity more than 98%, particle diameter is in 30 ~ 500 μm of graphite flakes and the stripper injection kettle with agitator, the motor starting kettle is stirred, make mixing of materials uniform, wherein the consisting of of stripper: normal propyl alcohol 30 parts by weight, terpineol 30 parts by weight, Hydroxylated acrylic resin 15 parts by weight, silicon dioxide 5 parts by weight.The particle diameter of silicon dioxide is below 5 microns.The number-average molecular weight of Hydroxylated acrylic resin is 10000～20000.The weight ratio of graphite flakes and stripper is 1:5.
S2. heating kettle, keeping still body temperature is 70 DEG C, and pressure is 2.5atm, and agitator shaft speed is 1500rpm/min, response time 4h.
S3. by discharging opening, upper strata suspension is expelled in storage tank after stopped reaction, stands 24h head product derived above.
S4. the graphene suspension in the storage tank obtained by step S3 is delivered in centrifuge, and centrifuge speed is 1000rpm/min, and centrifugation time 2h takes the supernatant, and in vacuum apparatus, vacuum is filtrated to get filter cake.
S5. filter cake step S4 obtained with appropriate distilled water wash, filter cake more than lyophilization 3h in freeze drying plant, namely obtain graphene product.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (5)
1. a Graphene stripping means, it is characterised in that the method comprises the following steps:
S1. by purity more than 98%, particle diameter is that 30 ~ 500 μm of graphite flakes and stripper inject in the kettle with agitator according to the weight ratio of 1:2～5, and the motor starting kettle is stirred, and makes mixing of materials uniform, wherein the consisting of of stripper:
Alcohols solvent 100 parts,
Hydroxylated acrylic resin 3～20 parts,
Frosted grain 1～5 part；
Wherein, each component is in its parts by weight；
S2. heating kettle, keeping still body temperature is 50 DEG C ~ 80 DEG C, and pressure is 1 ~ 3atm, and agitator shaft speed is 1000 ~ 2000rpm/min, response time 3 ~ 6h；
S3. by discharging opening, upper strata suspension is expelled in storage tank after stopped reaction, stands 24h head product derived above；
S4. the graphene suspension in the storage tank obtained by step S3 is delivered in centrifuge, and centrifuge speed is 1000 ~ 6000rpm/min, and centrifugation time 10min ~ 2h takes the supernatant, and in vacuum apparatus, vacuum is filtrated to get filter cake；
S5. filter cake step S4 obtained with appropriate distilled water wash, filter cake more than lyophilization 3h in freeze drying plant, namely obtain graphene product.
2. Graphene stripping means as claimed in claim 1, it is characterised in that in described step S1, described alcohols solvent is one or more in ethanol, normal propyl alcohol, n-butyl alcohol, propylene glycol and terpineol.
3. Graphene stripping means as claimed in claim 1, it is characterised in that in described step S1, the particle diameter of described frosted grain is below 5 microns.
4. Graphene stripping means as claimed in claim 3, it is characterised in that in described step S1, described frosted grain is the one in alumina powder, silicon dioxide powder.
5. Graphene stripping means as claimed in claim 1, it is characterised in that in described step S1, the number-average molecular weight of described Hydroxylated acrylic resin is 10000～20000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410705961.2A CN105712325A (en) | 2014-12-01 | 2014-12-01 | Method for stripping graphene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410705961.2A CN105712325A (en) | 2014-12-01 | 2014-12-01 | Method for stripping graphene |
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| Publication Number | Publication Date |
|---|---|
| CN105712325A true CN105712325A (en) | 2016-06-29 |
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| CN201410705961.2A Pending CN105712325A (en) | 2014-12-01 | 2014-12-01 | Method for stripping graphene |
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- 2014-12-01 CN CN201410705961.2A patent/CN105712325A/en active Pending
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Application publication date: 20160629 |