CN-224207802-U - Polytetrafluoroethylene dispersion resin coagulation stirring device for dry electrode binder

CN224207802UCN 224207802 UCN224207802 UCN 224207802UCN-224207802-U

Abstract

The utility model relates to the technical field of high polymer materials, in particular to a polytetrafluoroethylene dispersion resin coagulation stirring device for a dry electrode binder, which comprises a coagulation barrel, a stirring device and a stirring device, wherein a driving mechanism is arranged at the top of the coagulation barrel, and a baffle plate is arranged on the inner wall of the coagulation barrel; the stirring rod, the top of which extends out of the coagulation barrel and is connected with the driving mechanism, the bottom of which extends into the cavity of the coagulation barrel, the declining blade arranged at the bottom of the stirring rod, and the vortex stirring blade arranged at the bottom of the stirring rod and below the declining blade. The polytetrafluoroethylene dispersion resin coagulation stirring device for the dry electrode binder can adjust the specific gravity of the dispersion resin mother liquor to a lower level so as to realize the production of the dispersion resin fine powder with uniform particles, and has good fiber forming effect, high fiber forming rate and difficult filament breakage. When used as a dry electrode binder, the active carbon particles exist in a fibrous state, so that the active carbon particles are more tightly contacted with the conductive agent particles, and the electrode has the advantages of high density, good conductivity, high capacity and the like.

Inventors

Lian Jingsong
XU WANXIN
LUO WENCHANG
ZHU JIANFENG
Rao Mingqun
WANG ZHIXI
ZHANG CHANGYUAN
LIN XIAOQIN

Assignees

福建三农新材料有限责任公司

Dates

Publication Date: 20260508
Application Date: 20250528

Claims (10)

1. A polytetrafluoroethylene dispersion resin coagulation stirring device for a dry electrode binder, comprising: the top of the condensing barrel is provided with a driving mechanism, and the inner wall of the condensing barrel is provided with a baffle plate; the top of the stirring rod extends out of the coagulation barrel and is connected with the driving mechanism, and the bottom of the stirring rod extends into the inner cavity of the coagulation barrel; The downward inclined blade is arranged at the bottom of the stirring rod; vortex stirring rake sets up in the bottom of puddler and is located the below of declining paddle.
2. The coagulation stirring device of polytetrafluoroethylene dispersion for dry electrode binders according to claim 1, wherein the downtilt blade comprises a downtilt rod, and two or more of the downtilt rods are uniformly distributed on the stirring rod in a circumferential direction.
3. The coagulation stirring device of polytetrafluoroethylene dispersion for dry electrode adhesives according to claim 2, further comprising a spindle sleeve, wherein the spindle sleeve is sleeved outside the two or more lower diagonal rods.
4. The stirring apparatus for agglomerating polytetrafluoroethylene dispersion for dry electrode binders according to claim 1, wherein the vortex stirring paddle comprises connecting rods and flow guiding sleeves, two or more connecting rods are uniformly distributed on the stirring rod in a circumferential direction, a free end of each connecting rod is connected with one flow guiding sleeve, and the flow guiding sleeve is provided with a through hole in a direction tangential to a circumferential direction around the stirring rod.
5. The coagulation stirring device of polytetrafluoroethylene dispersion for dry electrode binders as recited in claim 4, wherein the cross-sectional shape of the water inlet end of the through-hole is circular and the cross-sectional shape of the water outlet end of the through-hole is elliptical.
6. The coagulation stirring device of polytetrafluoroethylene dispersion for dry electrode binders as set forth in claim 4, wherein the five connecting rods are uniformly distributed on the stirring rod in the circumferential direction.
7. The coagulation stirring device of polytetrafluoroethylene dispersion for dry electrode binders as recited in claim 1, wherein the baffle includes a first curved surface and a second curved surface that are in contact with each other in a circumferential direction of the coagulation bucket.
8. The stirring apparatus for agglomerating polytetrafluoroethylene dispersion resin for dry electrode binders according to claim 7, wherein three baffle plates are uniformly distributed in the circumferential direction on the inner wall of the agglomerating tank, and the three baffle plates are arranged around the vortex stirring paddle.
9. The coagulation stirring device of polytetrafluoroethylene dispersion resin for dry electrode binder as set forth in claim 1, wherein a pure water inlet and a mother liquor inlet are provided at the top of the coagulation bucket.
10. The coagulation stirring device of polytetrafluoroethylene dispersion for dry electrode adhesives according to claim 1, wherein the driving mechanism comprises a motor and a decelerator, and the motor, decelerator and stirring rod are connected in this order.

Description

Polytetrafluoroethylene dispersion resin coagulation stirring device for dry electrode binder Technical Field The utility model relates to the technical field of high polymer materials, in particular to a polytetrafluoroethylene dispersion resin coagulation stirring device for a dry electrode binder. Background At present, a dry battery using a PTFE binder has a series of problems that an active material is easy to fall off in the working process, electrochemical side reactions exist among electrode material components, the binder and the electrode material are difficult to uniformly distribute in the processing process, and equipment for pressing a dry self-supporting film is rough. In order to be processable into self-supporting films, the dry films must have a certain mechanical tensile strength. If the binder fails to achieve such tensile strength, for example because of very low binder content or defects due to mixture inhomogeneities, the risk of film cracking is very high, in particular for films below 100 μm, the wider the film, the faster the production, the more unstable the corresponding process steps and dry film quality. In addition, about 5 tons of wastewater is produced by coagulation of each ton of polytetrafluoroethylene resin (calculated by dry materials), and most enterprises directly discharge the wastewater as industrial wastewater. However, due to the limitation of the existing polytetrafluoroethylene dispersion resin production process, the wastewater contains a small amount of resin and additives (specifically about 0.2% of PTFE, a trace amount of fluorine-containing surfactant and a small amount of other additives), and the substances are discharged along with the wastewater, so that the environment is endangered and a certain amount of resource waste is caused. In order to make the agglomeration more thorough, it is necessary to obtain a small particle size product with uniform particles. The structure of the coagulation stirring device refers to China patent application number 202323320558.1, which is named as a coagulation stirring device for PTFE dispersion resin fiber powder. The existing coagulation stirring device cannot enable carbon micro powder to be in contact with conductive agent particles to achieve ideal compactness, so that conductivity, capacity retention rate and the like of an electrode are damaged to a certain extent, the coagulation stirring device is not suitable for dry electrode materials of lithium ion batteries, the content of resin in coagulation waste water is about 0.25%, the problem of incomplete coagulation exists, resource waste is caused, and environmental protection is not facilitated. Disclosure of utility model The utility model aims to solve the technical problem of providing a polytetrafluoroethylene dispersion resin coagulation stirring device for a dry electrode binder, which enables coagulation to be more thorough. In order to solve the technical problems, the utility model adopts the technical scheme that the polytetrafluoroethylene dispersion resin coagulation stirring device for the dry electrode binder comprises: the top of the condensing barrel is provided with a driving mechanism, and the inner wall of the condensing barrel is provided with a baffle plate; the top of the stirring rod extends out of the coagulation barrel and is connected with the driving mechanism, and the bottom of the stirring rod extends into the inner cavity of the coagulation barrel; The downward inclined blade is arranged at the bottom of the stirring rod; vortex stirring rake sets up in the bottom of puddler and is located the below of declining paddle. Further, the downward inclined blade comprises a downward inclined rod, and more than two downward inclined rods are uniformly distributed on the stirring rod along the circumferential direction. Further, the telescopic device also comprises a spindle sleeve, and the spindle sleeve is sleeved outside the more than two inclined rods. Further, the vortex stirring paddle comprises connecting rods and flow guiding sleeves, more than two connecting rods are uniformly distributed on the stirring rod along the circumferential direction, the free end of each connecting rod is respectively connected with one flow guiding sleeve, and the flow guiding sleeves are provided with through holes in the direction tangential to the circumferential direction around the stirring rod. Further, the cross section of the water inlet end of the through hole is circular, and the cross section of the water outlet end of the through hole is elliptical. Further, five connecting rods are uniformly distributed on the stirring rod along the circumferential direction. Further, the baffle plate comprises a first curved surface and a second curved surface which are connected along the circumferential direction of the coagulation bucket. Further, three baffle plates are uniformly distributed on the inner wall of the coagulation barrel along the circ