CN115069112A - Charged dispersing device for nano powder filler - Google Patents
Charged dispersing device for nano powder filler Download PDFInfo
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- CN115069112A CN115069112A CN202210739178.2A CN202210739178A CN115069112A CN 115069112 A CN115069112 A CN 115069112A CN 202210739178 A CN202210739178 A CN 202210739178A CN 115069112 A CN115069112 A CN 115069112A
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- 239000000945 filler Substances 0.000 title claims abstract description 56
- 239000011858 nanopowder Substances 0.000 title claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 37
- 239000006185 dispersion Substances 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 18
- 230000001133 acceleration Effects 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 5
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 238000005054 agglomeration Methods 0.000 abstract description 10
- 230000002776 aggregation Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 3
- 239000004593 Epoxy Substances 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 description 19
- 239000002105 nanoparticle Substances 0.000 description 19
- 239000011159 matrix material Substances 0.000 description 15
- 229920000642 polymer Polymers 0.000 description 15
- 239000003822 epoxy resin Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005411 Van der Waals force Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000013339 polymer-based nanocomposite Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/05—Mixers using radiation, e.g. magnetic fields or microwaves to mix the material
- B01F33/051—Mixers using radiation, e.g. magnetic fields or microwaves to mix the material the energy being electrical energy working on the ingredients or compositions for mixing them
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
The invention relates to the technical field of filler charge dispersion, and provides a nano powder filler charge dispersion device which comprises a vibration feeder, a powder charge cavity and a mixing tank which are sequentially arranged from top to bottom; wherein a vibration sieve plate is arranged at the joint of the vibration feeder and the powder charging cavity; a positive plate and a negative plate are horizontally arranged in the powder charging cavity and are electrically connected with an external high-voltage power supply; the mixing tank is internally provided with a stirring paddle, the mixing tank is externally provided with a stirring motor, and the stirring motor is connected with the stirring paddle. The invention carries out charge treatment on the epoxy filler and can realize uniform charge on the surface of the nano powder filler. After the nano filler is subjected to uniform charge treatment, the charge separation of the nano filler is realized in the mixing process, and the agglomeration phenomenon of the nano filler is effectively inhibited.
Description
Technical Field
The invention relates to the technical field of filler charge dispersion, in particular to a nano powder filler charge dispersion device.
Background
The addition of the inorganic nano-filler can obviously improve the toughness, modulus, heat resistance and the like of the epoxy resin. However, since the nanoparticles have high surface energy and are easy to agglomerate, the performance of the composite material is determined by the dispersibility of the inorganic filler in the polymer matrix and the interface action between the inorganic filler and the organic matrix. The nano particles are easy to agglomerate, and the epoxy resin has higher viscosity, so that the nano particles are difficult to uniformly disperse in the epoxy resin. At present, there are many methods for dispersing nanoparticles, mainly including mechanical dispersion and chemical dispersion, but the problem of agglomeration still cannot be solved well. The surface of the particle can absorb charges in a discharge environment, and the particle can have coulomb repulsion after being charged with the same charges, so that the adsorption and agglomeration of the nano particles are effectively inhibited.
The nano particles and the polymer matrix have physical action and chemical action. Van der waals forces exist between the two phases, which can alter the forces between the polymer chains. In addition, the size of the nano particle and the size of the polymer chain are in the same order of magnitude, active sites exist on the surface of the nano particle, and chemical action also exists between the two phases. The dispersibility of the filler in the matrix is a key factor influencing the comprehensive performance of the composite material, and research on the dispersibility of the nanoparticles in the polymer matrix has attracted the attention of the industry and the scientific community. The nanoparticles are in a thermodynamically unstable state and have a strong tendency to agglomerate, and the agglomeration of the nanoparticles is not only soft agglomeration mainly based on electrostatic action such as van der waals force, but also hard agglomeration caused by liquid bridging force and surface tension due to moisture adsorption.
At present, the dispersion uniformity of nanoparticles is improved mainly by increasing the mechanical force of the blending process and appropriate surface treatment. The properties of the composite materials prepared by different mixing methods are also different. The method for improving dispersion mainly comprises wet grinding, mechanical dispersion, electrostatic agglomeration-resistant dispersion, freeze-dried powder dispersion, ultrasonic dispersion and the like. The factors determining the dispersion effect of the nanoparticles in the matrix are many and can be roughly divided into two categories, namely internal factors and external factors, wherein the internal factors mainly include the surface free energy and the surface appearance of the nanoparticles and the characteristics of the matrix; external factors mainly include processes and equipment for preparing the composite material, for example, factors influencing the dispersibility involved in preparing the composite material by a melt blending mode include the configuration of a screw, the rotating speed of the screw, the melting temperature and the like. When the content of the nano filler is high, the agglomerated nano particles are oriented in a chain shape along the direction of a shearing flow field, the dispersion of the particles is very small, and the particles are difficult to further disperse only by the shearing action, so that the proper filling amount has important influence on the performance of the composite material.
Disclosure of Invention
The invention aims to provide a nano powder filler charge dispersing device, which can realize uniform charge on the surface of a nano powder filler by carrying out charge treatment on an epoxy filler. After the nano filler is subjected to uniform charge treatment, the charge separation of the nano filler is realized in the mixing process, and the agglomeration phenomenon of the nano filler is effectively inhibited.
In order to solve the technical problem, the invention provides a nano powder filler charge dispersing device which comprises a vibration feeder, a powder charge cavity and a mixing tank which are sequentially arranged from top to bottom; wherein a vibration sieve plate is arranged at the joint of the vibration feeder and the powder charging cavity; a positive plate and a negative plate are horizontally arranged in the powder charging cavity and are electrically connected with an external high-voltage power supply; the mixing tank is internally provided with a stirring paddle, the mixing tank is externally provided with a stirring motor, and the stirring motor is connected with the stirring paddle.
Preferably, the stirring paddle is a ceramic stirring paddle.
Preferably, the positive electrode plate and the negative electrode are brass microporous plates, and the diameter of each micropore is 5 mm.
Preferably, the powder charge cavity is made of stainless steel, and the thickness of the powder charge cavity is 2 mm.
Preferably, the paddle agitator has a stirring power
N is stirring power, kW; rho a is the density of the wastewater, kg/m 3; w is 2v/d, namely rotation angular speed of a stirring paddle, rad/s; v is the linear velocity of the outer edge of the stirring paddle; d is the diameter of the primary selected stirrer; r is the radius of the stirring paddle, m; g is the acceleration of gravity, 9.8m/s 2.
Preferably, the particle's peak velocity PPV satisfies:
the horizontal plane of the vibrating feeder is provided with a feeding direction X and a feeding direction Y, the direction vertical to the feeding hopper plane is a Z direction, and the maximum moving speeds of materials in three directions are respectively set as
v xmax ,v ymax And v zmax ，。
Preferably, the movement displacement, speed and acceleration of the hopper surface respectively satisfy:
gamma is the angle of vibration direction, A i Amplitude of hopper surface, ω i Is the angular frequency of vibration.
Preferably, the force exerted by the material particles on the hopper surface mainly comprises the gravity G and the supporting force F of the hopper surface on the material particles N The friction force F to which the particles are subjected f And inertia force-ma, and the rest is corresponding components or resultant force of each force, and the sliding and jumping of the material particles meet the following conditions:
preferably, when F N When being less than or equal to 0, the material will break away from with the hopper face, and it is along the condition that the positive direction is beated to derive the material in summary:
the positive direction and the negative direction slide satisfy that:
preferably, the maximum value a of the vibration acceleration is obtained max And the vibration frequency f, the value of the vibration amplitude a can be obtained according to the following relation:
the invention has the following beneficial effects:
according to the nano powder filler charge dispersing device, the powder charge cavity and the mixing tank are respectively arranged on the reaction kettle, and the positive and negative electrode plates are arranged in the powder charge cavity, so that the whole structure is simple and compact, and uniform charge on the surface of the nano powder filler can be realized. After the nano filler is subjected to uniform charge treatment, the charge separation of the nano filler is realized in the mixing process, and the agglomeration phenomenon of the nano filler is effectively inhibited.
Drawings
Fig. 1 is a schematic structural diagram of a nano powder filler charge dispersion device provided in an embodiment of the present invention.
Reference numerals are as follows:
1. vibrating the feeder; 2. a powder charge cavity; 3. mixing and filling; 4. a positive plate; 5. a negative plate; 6. a stirring paddle; 7. a stirring motor; 8. a high voltage power supply.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, a preferred embodiment of the present invention provides a nano powder filler charge dispersing device, which includes a vibration feeder 1, a powder charging chamber 2 and a mixing tank 3, which are sequentially arranged from top to bottom; wherein, a vibration sieve plate is arranged at the joint of the vibration feeder 1 and the powder charging cavity 2; a positive plate 4 and a negative plate 5 are horizontally arranged in the powder charging cavity 2, and the positive plate 4 and the negative plate 5 are electrically connected with an external high-voltage power supply 8; the mixing tank 3 is internally provided with a stirring paddle 6, the mixing tank 3 is externally provided with a stirring motor 7, and the stirring motor 7 is connected with the stirring paddle 6.
In some preferred embodiments of the present invention, the paddle 6 is a ceramic paddle 6.
In some preferred embodiments of the present invention, the positive electrode plate 4 and the negative electrode are brass micro-porous plates, and the diameter of each micro-pore is 5 mm.
In some preferred embodiments of the present invention, the powder charging cavity 2 is made of stainless steel, and the thickness of the powder charging cavity 2 is 2 mm.
In some preferred embodiments of the present invention, the paddle agitator has a stirring power
N is stirring power, kW; rho a is the density of the wastewater, kg/m 3; w is 2v/d, namely rotation angular speed of a stirring paddle, rad/s; v is the linear velocity of the outer edge of the stirring paddle; d is the diameter of the primary selected stirrer; r is the radius of the stirring paddle, m; g is the acceleration of gravity, 9.8m/s 2.
In some preferred embodiments of the invention, the particle has a peak velocity PPV that satisfies:
the horizontal plane of the vibrating feeder is provided with a feeding direction X and a feeding direction Y, the direction vertical to the feeding hopper plane is a Z direction, and the maximum moving speeds of materials in three directions are respectively set as
v xmax ,v ymax And v zmax ，。
In some preferred embodiments of the invention, the displacement, velocity and acceleration of the movement of the hopper face are respectively such that:
gamma is the angle of vibration direction, A i Amplitude of hopper surface, ω i Is the angular frequency of vibration.
In some preferred embodiments of the invention, the force exerted by the particles of material on the hopper surface mainly comprises the gravitational force G and the supporting force F of the hopper surface on the particles of material N The friction force F to which the particles are subjected f And inertia force-ma, and the rest is corresponding components or resultant force of each force, and the sliding and jumping of the material particles meet the following conditions:
in some preferred embodiments of the invention, when F N When being less than or equal to 0, the material will break away from with the hopper face, and it is along the condition that the positive direction is beated to derive the material in summary:
the positive direction and the negative direction slide satisfy that:
in some preferred embodiments of the present invention, a vibration acceleration maximum a is obtained max And the vibration frequency f, the value of the vibration amplitude a can be obtained according to the following relation:
when the nano particles are filled in the polymer matrix, some agglomeration phenomenon exists in the composite material, so that the composite material is prepared
The mechanical properties of the composite material cause certain weakening effects. Nanoparticles with poor dispersibility are defined as two-phase particles, which contain mainly inorganic filler and a part of the adjacent polymer matrix. In this case, the filler is considered as a continuous phase and the adjacent polymer molecular chains are considered as a dispersed phase. Therefore, the proportion of adjacent polymers determines the dispersion state of the filler, and when no polymer molecular chain exists in the two-phase particles, the two-phase particles are converted into particle aggregates; and when the polymer molecular chains in the two-phase particles have higher occupation ratio, the particles show better dispersibility. Therefore, the dispersion state of the filler can be quantified by evaluating the proportion of the polymer molecular chains. Based on the Young modulus of the composite material, a Maxwell model and a Halpin-Tsai model are combined, and a two-phase particle relation model between the dispersion state of the nano filler and the mechanical property of the composite material is established.
For polymer-based nanocomposites, the relationship between filler volume fraction and composite Young's modulus can be represented by Maxwell's model:
wherein E is a And E b The elastic modulus of the filler and the elastic modulus of the matrix respectively,
is the volume fraction of filler. In the composite material, the mass fraction and the volume fraction of the filler can be mutually converted by a formula.
Based on Maxwell's model, the elastic modulus of the two-phase particles can be obtained. In this case, the filler is considered as a continuous phase and the adjacent polymer molecular chains are considered as a dispersed phase.
Wherein
Is the volume fraction of adjacent polymer chains,
wherein the c parameter represents the proportion of polymer molecular chains, and according to the assumption of two-phase particles, the dispersion state of the nano filler in the matrix can be quantified through the c parameter. Lower values of the mouth parameter mean that the two-phase particles are transformed into compact agglomerates, exhibiting a poor dispersion state in the composite. Conversely, when the c parameter is higher, it indicates that the nanoparticles have higher dispersibility in the matrix. Aiming at the characteristics of two-phase particles, a relation model between parameters and the elastic modulus of the composite material is established through a Halpin-Tsai model, and the Halpin-Tsai model can express that:
where l and d are the length and diameter of the filler, respectively, the two-phase particles are considered to be spherical. Thus, λ has a value of 2. Because the filler is a two-phase particle in the composite material,
is replaced by
E f Is replaced by E p . The Halpin-Tsai model may be transformed.
Wherein E is p Can be obtained mathematically. The elastic modulus of the composite material can be obtained through a tensile test, the c parameter can be further evaluated according to the obtained experimental result, and the dispersibility of the nano filler in the matrix can be judged. From the two-phase particle model, it can be seen that the dispersion state of the nanoparticles in the matrix has an important influence on the rigidity of the composite material. In the nano Sb, O3 particle filled PBT base composite material, E a And E b 195GPa and 1.83GPa, p respectively a And p b 5.2g/cm3 and 1.31g/cm3, respectively, and the dispersibility of the nano SbzOs particles in the PBT matrix can be evaluated through the tensile experiment result.
To sum up, the preferred embodiment of the present invention provides a nano powder filler charge dispersion device, which is compared with the prior art:
the nano powder filler charge dispersion device is provided with the solvent storage bin, the filler particle storage bin, the mixed solution storage bin and the electrostatic atomizer on the reaction kettle respectively, the whole structure is simple and compact, filler particles are effectively dispersed, the filler particles are uniformly distributed in epoxy resin, the influence caused by local non-uniformity is reduced, and the mechanical property and the electrical property of the epoxy resin are improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A nano powder filler charge dispersion device is characterized by comprising a vibration feeder, a powder charge cavity and a mixing tank which are sequentially arranged from top to bottom; wherein a vibration sieve plate is arranged at the joint of the vibration feeder and the powder charging cavity; a positive plate and a negative plate are horizontally arranged in the powder charging cavity and are electrically connected with an external high-voltage power supply; the mixing tank is internally provided with a stirring paddle, the mixing tank is externally provided with a stirring motor, and the stirring motor is connected with the stirring paddle.
2. The charged dispersion device for nano powder fillers according to claim 1, which is characterized in that: the stirring paddle is a ceramic stirring paddle.
3. The charged dispersing device for the nano powder filler according to claim 1, characterized in that: the positive plate and the negative electrode are brass micropore plates, and the diameter of each micropore is 5 mm.
4. The charged dispersion device for nano powder fillers according to claim 1, which is characterized in that: the powder charge cavity is made of stainless steel, and the thickness of the cavity of the powder charge cavity is 2 mm.
5. The charged dispersion device for nano powder fillers according to claim 1, which is characterized in that: stirring power of the paddle stirrer
N is stirring power, kW; rho a is the density of the wastewater, kg/m 3; w is 2v/d, namely rotation angular speed of a stirring paddle, rad/s; v is the linear velocity of the outer edge of the stirring paddle; d is the diameter of the primary selected stirrer; r is the radius of the stirring paddle, m; g is the acceleration of gravity, 9.8m/s 2.
6. The charged dispersion device for nano powder fillers according to claim 1, which is characterized in that: the peak velocity PPV of the particles satisfies:
the horizontal plane of the vibrating feeder is provided with a feeding direction X and a feeding direction Y, the direction vertical to the feeding hopper plane is a Z direction, and the maximum moving speeds of materials in three directions are respectively v xmax ,v ymax And v zmax 。
7. The charged dispersion device for nano powder fillers according to claim 6, which is characterized in that: the motion displacement, the speed and the acceleration of the hopper surface respectively meet the following requirements:
gamma is vibrationAngle of orientation, A i Amplitude of hopper surface, ω i Is the angular frequency of vibration.
8. The charged dispersing device for nano powder fillers according to claim 7, characterized in that: the stress of the material particles on the hopper surface mainly comprises gravity G and supporting force F of the hopper surface to the material particles N The friction force F to which the particles are subjected f And inertia force-ma, and the rest is corresponding components or resultant force of each force, and the sliding and jumping of the material particles meet the following conditions:
9. the charged dispersion device for nano powder fillers according to claim 6, which is characterized in that: when F is present N When being less than or equal to 0, the material will break away from with the hopper face, and it is along the condition that the positive direction is beated to derive the material in summary:
the positive direction and the negative direction slide satisfy that:
10. the charged dispersion device for nano powder fillers according to claim 9, which is characterized in that: the maximum value a of the vibration acceleration is obtained max And the vibration frequency f, the value of the vibration amplitude a can be obtained according to the following relation:
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| CN202210739178.2A CN115069112A (en) | 2022-06-27 | 2022-06-27 | Charged dispersing device for nano powder filler |
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| CN202210739178.2A CN115069112A (en) | 2022-06-27 | 2022-06-27 | Charged dispersing device for nano powder filler |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101199953A (en) * | 2006-12-13 | 2008-06-18 | 北京有色金属研究总院 | Ultrafine powder electrostatic classification device |
| CN107665971A (en) * | 2016-07-29 | 2018-02-06 | 深圳市沃特玛电池有限公司 | A kind of lithium ion cell electrode raw material decentralized approach early stage |
| CN109943021A (en) * | 2019-03-25 | 2019-06-28 | 电子科技大学 | A kind of method of nano inorganic filler modified epoxy resin composite |
| CN110776719A (en) * | 2019-10-18 | 2020-02-11 | 合肥工业大学 | Method for dispersing nano inorganic particle filler in solid epoxy resin |
-
2022
- 2022-06-27 CN CN202210739178.2A patent/CN115069112A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101199953A (en) * | 2006-12-13 | 2008-06-18 | 北京有色金属研究总院 | Ultrafine powder electrostatic classification device |
| CN107665971A (en) * | 2016-07-29 | 2018-02-06 | 深圳市沃特玛电池有限公司 | A kind of lithium ion cell electrode raw material decentralized approach early stage |
| CN109943021A (en) * | 2019-03-25 | 2019-06-28 | 电子科技大学 | A kind of method of nano inorganic filler modified epoxy resin composite |
| CN110776719A (en) * | 2019-10-18 | 2020-02-11 | 合肥工业大学 | Method for dispersing nano inorganic particle filler in solid epoxy resin |
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