CN117894909A - Tail material recovery method and preparation method of self-supporting dry functional membrane - Google Patents
Tail material recovery method and preparation method of self-supporting dry functional membrane Download PDFInfo
- Publication number
- CN117894909A CN117894909A CN202211266381.9A CN202211266381A CN117894909A CN 117894909 A CN117894909 A CN 117894909A CN 202211266381 A CN202211266381 A CN 202211266381A CN 117894909 A CN117894909 A CN 117894909A
- Authority
- CN
- China
- Prior art keywords
- tailings
- self
- membrane
- calendaring
- roller
- 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
- 239000012528 membrane Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000011084 recovery Methods 0.000 title claims description 11
- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000000463 material Substances 0.000 title abstract description 15
- 238000003490 calendering Methods 0.000 claims abstract description 81
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 238000004064 recycling Methods 0.000 claims abstract description 19
- 238000009966 trimming Methods 0.000 claims abstract description 19
- 238000007781 pre-processing Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 37
- 238000005096 rolling process Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000008092 positive effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 239000011812 mixed powder Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000011149 active material Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 206010016654 Fibrosis Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000004761 fibrosis Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a tailing recycling method of a self-supporting dry type functional membrane. The method comprises the following steps: obtaining a tailing, and preprocessing the tailing: adding the pretreated tailings onto a preformed film sheet positioned between an nth calendering roller and an n+1th calendering roller in a multi-roller calendering mechanism, wherein n is more than or equal to 3 and less than M, n is an odd number, and M is the total number of the calendering rollers; and (3) carrying out calendaring treatment and trimming treatment on the tailings and the preformed film to prepare the self-supporting dry-type functional film. According to the tailing recycling method, the pretreated material is added to the preformed membrane in the multi-roller calendaring mechanism, so that the pretreated tailing is combined with the preformed membrane formed by preliminary calendaring of the multi-roller calendaring mechanism, and the self-supporting dry type functional membrane is prepared through calendaring and trimming, thereby realizing the recycling of the tailing, saving resources and having a positive effect on environmental protection.
Description
Technical Field
The invention relates to the technical field of resource recovery, in particular to a tailing recovery method and a preparation method of a self-supporting dry-type functional membrane.
Background
Currently, the manufacturing process of the functional membrane of the energy storage device generally includes a wet manufacturing process and a dry manufacturing process. The wet manufacturing process is to mix the binder and the active electrode component with the solvent to prepare slurry, then coat the slurry on a current collector, and dry and remove the solvent to form a film on the current collector. The dry process is to dry mix the binder and the active electrode component directly, then to calender the dry mixture to form a film layer, and to compound with the current collector.
In the dry process of the functional membrane, the dry mixed powder is directly rolled into the self-supporting dry functional membrane, and the two side edges of the self-supporting dry functional membrane are basically impossible to be neat under the influence of the fluidity of the dry mixed powder, so that a trimming step is needed before the self-supporting dry functional membrane is rolled up to remove irregular edges and form a tail. In general, the proportion of the tailings can reach 5-15% of the total mass of the dry mixed powder, and great waste of resources is caused.
Disclosure of Invention
Based on the above, it is necessary to provide a method for recovering the tail material of the self-supporting dry functional membrane and a method for preparing the same, aiming at the problem of resource waste caused by more tail material generated by preparing the dry functional membrane by adopting a dry manufacturing process in the prior art.
In a first aspect of the invention, a method for recovering tailings of a self-supporting dry-type functional membrane is provided, comprising the steps of:
obtaining a tailing, and preprocessing the tailing:
adding the pretreated tailings onto a preformed film sheet in a multi-roller calendaring mechanism;
and (3) carrying out calendaring treatment and trimming treatment on the tailings and the preformed film to prepare the self-supporting dry-type functional film.
In one embodiment, the preprocessing the tailings comprises the steps of:
crushing the tailings; the fineness of the crushed tailing is 5-2000 meshes.
In the embodiment, the tailings are preprocessed in a crushing mode, the fineness of the crushed tailings is reasonably controlled to be 5-2000 meshes, the phenomena that the adhesive in the tailings is obviously damaged due to too small fineness or the sheet-shaped tailings remain due to too large fineness are avoided, and the prepared self-supporting dry-type functional membrane can meet the production process and mechanical properties of the membrane while the effective recycling of the tailings is realized.
In one embodiment, the multi-roller calendaring mechanism comprises a tailing feeding device, wherein the tailing feeding device comprises a first powder baffle and a second powder baffle which are arranged at intervals, the arrangement direction of the first powder baffle and the arrangement direction of the second powder baffle are parallel to the calendaring roller, and a channel formed between the first powder baffle and the second powder baffle is used for conveying crushed tailings.
In one embodiment, the width between the first powder baffle and the second powder baffle is 50% -95% of the width of the preformed film sheet.
In one embodiment, the preprocessing the tailings comprises the steps of:
cutting the tailing into strips.
In the embodiment, the tailings are cut into strips, and then the strips of tailings are directly transversely placed in a roll gap, so that the strips and the preformed film are rolled and combined to form a film, and a 'well' -shaped fiber network is formed on a microcosmic scale, so that the transverse tensile strength of the film is greatly enhanced. Therefore, the mode of transversely adding the cut strip-shaped tailings into the multi-roller calendaring mechanism is adopted, the comprehensive strength of the self-supporting functional membrane obtained after calendaring treatment and trimming treatment can be improved, and meanwhile, the degree of fibrosis of the binder can be more sufficient, so that the content of the binder in the self-supporting functional membrane is reduced.
In one embodiment, the length of the cut strip tail is 60% -95% of the width of the film.
In one embodiment, the length direction of the tailings is parallel to the roll gap of the calendering rolls in the process of adding the pretreated tailings between the nth calendering roll and the n+1th calendering roll of the multi-roll calendering mechanism.
In one embodiment, the adding of the pretreated tailstock to the preformed film sheet in the multi-roll calendaring mechanism comprises: and adding the pretreated tailings onto a preformed film sheet positioned between an nth calendering roller and an n+1th calendering roller in a multi-roller calendering mechanism, wherein n is more than or equal to 3 and less than M, n is an odd number, and M is the total number of the calendering rollers.
In one embodiment, the temperature of the calendaring process is from 50℃to 250 ℃.
In the above embodiment, the binder in the powder is sufficiently softened by the high temperature to generate hot tack, thereby ensuring film forming property.
In a second aspect of the present invention, a method for preparing a self-supporting dry-type functional membrane is provided, comprising the steps of:
s1, carrying out calendaring treatment and trimming treatment on a membrane premix, respectively collecting a membrane and tailings, and rolling the membrane;
s2, preparing a self-supporting dry type functional membrane by the tailings collected in the step S1 according to the tailings recovery method of any one of claims 1 to 9, respectively collecting the membrane and the tailings, and rolling the membrane;
in one embodiment, step S2 further includes the steps of:
s3, repeating the step S2 one or more times by using the tailings collected in the step S2.
In the method for recycling the tailings of the self-supporting dry type functional membrane, the tailings generated in the process of producing the self-supporting dry type functional membrane are preprocessed, the preprocessed materials are added into a multi-roller calendaring mechanism in operation, the preprocessed tailings are combined with the preformed membrane formed by the preliminary calendaring of the multi-roller calendaring mechanism, and the self-supporting dry type functional membrane is prepared through the calendaring and trimming processes, so that the tailings are recycled, resources are saved, and the method has a positive effect on protecting the environment; in addition, the tailing recycling method has high recycling rate of the tailings, can reduce the production cost of preparing the self-supporting dry type functional membrane, has small environmental pollution, is simple and convenient to operate, and is convenient for realizing industrialization.
Furthermore, the tailing recycling method is integrated with the preparation steps of the self-supporting dry type functional membrane, so that the tailings can be continuously digested, and the recycling of the tailings and the preparation of a new self-supporting dry type functional membrane can be synchronously realized, so that the redundant tailing amount of the whole self-supporting dry type functional membrane production line is close to 0%.
Drawings
FIG. 1 is a process flow diagram of a method for recovering tailings from a self-supporting dry functional membrane in accordance with one embodiment of the present invention;
FIG. 2 is a process flow diagram of a method for recovering tailings during pretreatment of the tailings by comminution in accordance with one embodiment of the present invention;
FIG. 3 is a process flow diagram of a method for recycling tailings when pretreating the tailings by cutting according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a method for recovering tailings during pretreatment of the tailings by crushing according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a method for recycling tailings when pretreating the tailings by cutting according to an embodiment of the present invention.
Detailed Description
The following describes the tail recovery method of the self-supporting dry functional membrane according to the present invention in further detail with reference to specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the present invention, "first aspect", "second aspect", etc. are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity, nor as implying an importance or quantity of the indicated technical features. Moreover, "first," "second," etc. are for non-exhaustive list description purposes only, and it should be understood that no closed limitation on the number is made.
In the invention, the technical characteristics described in an open mode comprise a closed technical scheme composed of the listed characteristics and also comprise an open technical scheme comprising the listed characteristics.
In the present invention, the numerical ranges are referred to as continuous, and include the minimum and maximum values of the ranges, and each value between the minimum and maximum values, unless otherwise specified. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
The temperature parameter in the present invention is not particularly limited, and may be a constant temperature treatment or a treatment within a predetermined temperature range. The constant temperature process allows the temperature to fluctuate within the accuracy of the instrument control.
In the present invention, "membrane premix" has the same meaning as "dry mix powder" and refers to the raw materials for preparing a self-supporting dry functional membrane without a tail, which generally includes an active material, a binder and an additive. The additives may be, without limitation, such as conductive agents, pore formers, adhesion enhancers, and the like.
In the invention, the "tailing" can be the edge material cut off after one or more times of calendaring and trimming treatment by dry-mixed powder, or the edge material obtained after calendaring and trimming treatment in the process of one or more times of circulation of the preparation method of the self-supporting dry-type functional membrane.
The invention provides a method for recovering tailings of a self-supporting dry type functional membrane, which has the process flow shown in figure 1 and comprises the following steps:
s100, obtaining a tailing, and preprocessing the tailing:
s200, adding the pretreated tailings to a preformed film in a multi-roller calendaring mechanism;
and S300, carrying out calendaring treatment and trimming treatment on the tailings and the preformed film to prepare the self-supporting dry-type functional film.
In the above-mentioned tailing recycling method, it is necessary to pretreat the tailings to change fineness or shape of the tailings, and then add the pretreated tailings onto a preformed film of a multi-roll calendaring mechanism. The multi-roll calendaring mechanism comprises M calendaring rolls, a raw material feeding device is correspondingly arranged above a roll gap between the first calendaring roll and the second calendaring roll, a membrane premix is fed between the first calendaring roll and the second calendaring roll, the membrane premix is a raw material for preparing a self-supporting dry-type functional membrane, and the membrane premix is dry-mixed powder and generally comprises an active material, a binder and an additive; the film premix forms a preformed film after preliminary calendering through a first calender roll and a second calender roll.
In one embodiment, since the preformed film sheet is continuously conveyed on the lower surface of the even number roller and the upper surface of the odd number roller while being conveyed by the multi-roller rolling mechanism, the pretreated tail is added to the preformed film sheet positioned between the nth rolling roller and the n+1th rolling roller of the multi-roller rolling mechanism, wherein 3.ltoreq.n < M, n is an odd number, for example, the pretreated tail is added between the third rolling roller and the fourth rolling roller, between the fifth rolling roller and the sixth rolling roller, between the seventh rolling roller and the eighth rolling roller, or the like; in this way, the tail added to the preformed film sheet can be immediately pressed between the lower surface of the even rolls and the preformed film sheet, so that the tail added to the multi-roll calendaring mechanism can be immediately combined with the preformed film sheet. Preferably, n is 3.
Alternatively, the number of calender rolls is 4 to 11. Further, the number of the calender rolls is 6 to 9.
In one embodiment, the calender roll has a speed ratio of 1: (1.05-2). The greater the ratio of the roll-off time, the greater the shear force, but too high a ratio can result in uneven surfaces of the entire diaphragm and even periodic streaks. The adoption of a proper speed ratio of the calendaring rollers can enhance the penetrability and bonding strength of the tail material to the preformed film, and can make the surface of the manufactured film flat.
In one embodiment, to ensure that the tailings can be better accommodated between the two calender rolls, the roll gap of the two calender rolls to which the tailings are fed and/or the roll speed ratio of the two calender rolls can be adjusted. Specifically, the roll gap between two adjacent calendaring rolls corresponding to the tailing to be added after pretreatment can be increased, so that the tailing is contained at the roll gap in a mode of increasing the containing space; or the speed ratio between two adjacent rolling rollers corresponding to the tailings to be added after pretreatment is increased, so that the tailings fed between the two rolling rollers can be quickly pressed between the preformed film and the next rolling roller, and the problem that more tailings are difficult to accommodate due to the accumulation of the tailings between the two rolling rollers is avoided; or, when the roll gap between two adjacent calendaring rolls corresponding to the pretreated tailings is increased, the speed ratio between two adjacent calendaring rolls corresponding to the tailings which are required to be pretreated is increased, so that the tailings can be better accommodated. Of course, it should be noted that, in order to accommodate the tailing between the adjacent two calender rolls corresponding to the tailing, the roll gap width or the calender roll speed ratio may be adjusted according to the actual tailing addition amount per unit time, whether the roll gap is increased or the speed ratio of the two calender rolls is increased, which is not limited in this embodiment.
In one embodiment, the active material in the dry-mix powder has a bulk density (bulk density) of 0.1g/cm3 to 3.0g/cm3.
In one embodiment, the average particle size (D50) of the active material in the dry-mix powder is from 1 μm to 30 μm.
In one embodiment, the thickness of the self-supporting dry functional film obtained by the tailing recycling method is 50-400 μm.
The mode of pretreating the tailings in the present invention is not limited, and the following is a specific example.
Example 1
The pretreatment of the tailings comprises the following steps: crushing the tailings; the fineness of the crushed tailing is 5-2000 meshes.
Specifically, as shown in fig. 2 and 4, after the tailings are obtained, the tailings are crushed, and the fineness of the crushed tailings is reasonably controlled to be 5-2000 meshes. The fineness of the tailing after crushing is smaller, namely the crushing strength is too high, the binder in the tailing is obviously destroyed, so that the bonding effect of the tailing and the preformed membrane is reduced, and the mechanical strength and the electrical property of the self-supporting dry-type functional membrane manufactured are reduced; the fineness of the crushed tailings is too large, namely the crushing strength is too small, the flaky tailings can remain, so that when the crushed tailings are fed into a multi-roller calendaring mechanism, the feeding is uneven, and the mechanical strength and the electrical property of the self-supporting dry type functional membrane obtained by manufacturing can be reduced. Preferably, the fineness of the crushed tailings is 10-500 meshes.
The pulverizing means may be, without limitation, mechanical grinding, impact grinding, air flow grinding, etc.
Further, the multi-roller calendaring mechanism in this embodiment further includes a tailing feeding device, which is disposed above the calendaring rollers, so as to feed the crushed tailings between the two corresponding calendaring rollers; the tailing feeding device comprises a first powder baffle and a second powder baffle which are arranged at intervals, the arrangement direction of the first powder baffle and the arrangement direction of the second powder baffle are parallel to the calendaring roller, and a channel formed between the first powder baffle and the second powder baffle is used for conveying crushed tailings.
Optionally, the width between the first powder baffle and the second powder baffle is 50% -95% of the width of the preformed film, and the channel formed by the first powder baffle and the second powder baffle corresponds to the middle position of the preformed film, so that the width of the tail material which is not contacted with the powder at two sides of the preformed film is equal after the tail material is fed into the preformed film; when trimming is carried out in the tailing recycling method, the formed new tailings are mainly or completely membrane premix, so that when recycling is repeated, the new tailings can be prevented from containing old tailings, and higher consistency of front and rear membranes is maintained. Further, the width between the first powder baffle and the second powder baffle is 70% -90% of the width of the preformed film.
Alternatively, the temperature of the casting treatment in this embodiment is 50 ℃ to 250 ℃, and the binder in the powder can be fully softened by high temperature to generate viscosity. In the multi-roller calendaring mechanism, the rotating speed of the rear calendaring roller is larger than that of the front calendaring roller, namely the speed ratio between the rear calendaring roller and the front calendaring roller is larger than 1, so that after the crushed tailings are added into the preformed film, flowing, mixing, penetrating and shearing occur under the action of the rotating friction and the extrusion force of the high-temperature calendaring roller, and finally the self-supporting functional film is formed by combining. The process of forming the self-supporting functional membrane by processing the tail powder and the preformed membrane is simple, no additional mixing process is needed, and the recovery and reconstruction efficiency and cost of the tail are improved.
Example two
The pretreatment of the tailings comprises the following steps: cutting the tailing into strips.
Specifically, as shown in fig. 3 and 5, after the tailings are obtained, the tailings are cut to obtain strip-shaped tailings of a specific length, and then the tailings are transversely placed in a roll gap, that is, the tailings are placed on a preformed film along a direction parallel to the roll gap between two adjacent calender rolls, so that the tailings cut into strips are directly combined with the preformed film to form a formed film under the calendering treatment. The tailing may be added manually or automatically by mechanical equipment, which is not limited in this embodiment.
In the multi-roll calendering process, a speed ratio exists between any two adjacent calender rolls, the rotating speed of the latter calender roll is larger than that of the former calender roll, namely, the speed ratio between the latter calender roll and the former calender roll is larger than 1, therefore, in the process that the film sheet is sequentially transferred from the former calender roll to the latter calender roll, the adhesive is fibrillated, for example, the adhesive is polytetrafluoroethylene, and after the adhesive is further stretched and oriented in the longitudinal direction, the longitudinal fibrillation degree of the polytetrafluoroethylene is more sufficient, wherein the longitudinal direction refers to the advancing direction of the film sheet. The self-supporting functional film thus obtained from the calendering of the film premix exhibits a remarkable unidirectional in strength, i.e. a higher tensile strength in the machine direction and a lower tensile strength in the transverse direction. In this embodiment, the tail material is cut into strips, and then the strip-shaped tail material is directly and transversely placed in the roll gap, so that the film formed by rolling and combining the tail material and the preformed film will form a 'well' -shaped fiber network on the microcosmic scale, which greatly enhances the transverse tensile strength of the film. Therefore, the mode of transversely adding the cut strip-shaped tailings into the multi-roller calendaring mechanism is adopted, the comprehensive strength of the self-supporting functional membrane obtained after calendaring treatment and trimming treatment can be improved, and meanwhile, the degree of fibrosis of the binder can be more sufficient, so that the content of the binder in the self-supporting functional membrane is reduced.
Optionally, the length of the tailings after being cut into strips is 60% -95% of the width of the film, and the middle position of the tailings corresponds to the middle position of the preformed film in the width direction, so that the widths of the two sides of the preformed film, which are not contacted with the powder tailings, are equal after the tailings are fed into the preformed film; when trimming is carried out in the tailing recycling method, the formed new tailings are mainly or completely membrane premix, so that when recycling is repeated, the new tailings can be prevented from containing old tailings, and higher consistency of front and rear membranes is maintained. Further, the length of the tail material after being cut into strips is 75% -90% of the width of the film sheet.
Optionally, the temperature of the casting treatment in this embodiment is 50 ℃ to 250 ℃, and the high temperature makes the binder in the powder fully soften, so that the hot tack is generated. In the multi-roller calendaring mechanism, the rotating speed of the back calendaring roller is larger than that of the front calendaring roller, namely the speed ratio between the back calendaring roller and the front calendaring roller is larger than 1, after strip-shaped tailings are added into the preformed film, flowing, penetrating and shearing occur under the action of the rotating friction and the extrusion force of the high-temperature roller, and finally the reinforced self-supporting functional film is formed through combination.
The invention also provides a preparation method of the self-supporting dry type functional membrane, which comprises the following steps:
s1, carrying out calendaring treatment and trimming treatment on a membrane premix, respectively collecting a membrane and tailings, and rolling the membrane;
s2, preparing the self-supporting dry type functional membrane by the tailings collected in the step S1 according to the tailings recovery method, respectively collecting the membrane and the tailings, and rolling the membrane;
s3, repeating the step S2 one or more times by using the tailings collected in the step S2.
Specifically, at the beginning, the membrane premix is put into a multi-roller calendaring mechanism for calendaring and trimming, the membrane and the tailings obtained by trimming are respectively collected, and the membrane obtained after trimming is rolled; after obtaining the tailings, preparing a self-supporting functional membrane by adopting the tailings recovery method, respectively collecting the membrane and the tailings, and then rolling the membrane; then, the collected tailings can be used for preparing the self-supporting functional membrane by the tailings recovery method, and the self-supporting functional membrane is circulated continuously in sequence. Thus, the collected tailings can be continuously recycled and reused when the self-supporting functional membranes are produced by combining the membrane premix with the tailings recycling method.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method for recovering tailings of a self-supporting dry-type functional membrane is characterized by comprising the following steps:
obtaining a tailing, and preprocessing the tailing:
adding the pretreated tailings onto a preformed film sheet in a multi-roller calendaring mechanism;
and (3) carrying out calendaring treatment and trimming treatment on the tailings and the preformed film to prepare the self-supporting dry-type functional film.
2. The method for recovering tailings from a self-supporting dry functional membrane of claim 1 wherein the pretreatment of the tailings comprises the steps of:
crushing the tailings; the fineness of the crushed tailing is 5-2000 meshes.
3. The method for recovering tailings from a self-supporting dry functional membrane according to claim 2, wherein the multi-roller calendaring mechanism comprises a tailings feeding device, the tailings feeding device comprises a first powder baffle and a second powder baffle which are arranged at intervals, the arrangement direction of the first powder baffle and the second powder baffle is parallel to the calendaring roller, and a channel formed between the first powder baffle and the second powder baffle is used for conveying crushed tailings.
4. A method of recycling tailings of a self-supporting dry functional film sheet in accordance with claim 3 wherein the width between the first powder baffle and the second powder baffle is 50% -95% of the width of the preformed film sheet.
5. The method for recovering tailings from a self-supporting dry functional membrane of claim 1 wherein the pretreatment of the tailings comprises the steps of:
cutting the tailing into strips.
6. The method for recovering tail stock of self-supporting dry-type functional film according to claim 5, wherein the length of the tail stock after being cut into strips is 60% -95% of the width of the film.
7. The method according to claim 5, wherein the length direction of the tail is parallel to the roll gap of the rolls during the process of adding the pretreated tail between the n-th roll and the n+1-th roll of the multi-roll calender.
8. The method of claim 1, wherein adding the pretreated tailings to the preformed film sheet in a multi-roll calendaring mechanism comprises:
and adding the pretreated tailings onto a preformed film sheet positioned between an nth calendering roller and an n+1th calendering roller in a multi-roller calendering mechanism, wherein n is more than or equal to 3 and less than M, n is an odd number, and M is the total number of the calendering rollers.
9. The preparation method of the self-supporting dry type functional membrane is characterized by comprising the following steps of:
s1, carrying out calendaring treatment and trimming treatment on a membrane premix, respectively collecting a membrane and tailings, and rolling the membrane;
s2, preparing a self-supporting dry type functional membrane by the tailings collected in the step S1 according to the tailings recovery method of any one of claims 1 to 8, respectively collecting the membrane and the tailings, and rolling the membrane.
10. The method for preparing a self-supporting dry-type functional membrane according to claim 9, further comprising the step of after step S2:
s3, repeating the step S2 one or more times by using the tailings collected in the step S2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211266381.9A CN117894909A (en) | 2022-10-14 | 2022-10-14 | Tail material recovery method and preparation method of self-supporting dry functional membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211266381.9A CN117894909A (en) | 2022-10-14 | 2022-10-14 | Tail material recovery method and preparation method of self-supporting dry functional membrane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117894909A true CN117894909A (en) | 2024-04-16 |
Family
ID=90640036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211266381.9A Pending CN117894909A (en) | 2022-10-14 | 2022-10-14 | Tail material recovery method and preparation method of self-supporting dry functional membrane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117894909A (en) |
-
2022
- 2022-10-14 CN CN202211266381.9A patent/CN117894909A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2355215B1 (en) | Carboxymethylcellulose for electrode in rechargeable battery with nonaqueous electrolyte, salt thereof, and aqueous solution thereof | |
| CN102629681B (en) | Powder-based electrode forming method | |
| DE3026246C2 (en) | ||
| CN102837478B (en) | PP (Propene Polymer) fiber composite board and production method | |
| CN101087020A (en) | A method for making zinc electrode using scraping plasm | |
| DE102008025250A1 (en) | Crushing device for producing particles from a band-shaped material | |
| EP3879597A1 (en) | Method for processing an electrode path and processing device for same | |
| EP1040531A1 (en) | Reclamation of material from coated substrates | |
| CN117894909A (en) | Tail material recovery method and preparation method of self-supporting dry functional membrane | |
| DE102020129153A1 (en) | SYSTEM AND METHOD FOR MANUFACTURING AN ELECTRODE FOR A BATTERY | |
| WO2024082889A1 (en) | Apparatus for preparing dry electrode | |
| CN113896017A (en) | Pole piece forming equipment and pole piece forming process | |
| DE2909760A1 (en) | METHOD OF MANUFACTURING ZINC ELECTRODES FOR GALVANIC CELLS | |
| DE102020216546A1 (en) | Process for producing an electrode powder mixture for a battery cell | |
| DE102013226921A1 (en) | Nonwoven fabric made of carbon fibers and thermoplastic fibers | |
| CN206196989U (en) | A kind of flexible solution rod equipment of cigarette rod | |
| CN113119351B (en) | Method for preparing reclaimed material from thermoplastic composite material stretched product | |
| KR20230022038A (en) | MANUFACTURING SYSTEM AND method for Dry electrode film | |
| CN202157045U (en) | Double-screw rubber devulcanizing device | |
| CN114434840A (en) | Tailing recycling method of self-supporting dry type functional membrane | |
| EP4050686A2 (en) | Method for the continuous production of bipolar plates from plastic with electrically conductive particles | |
| DE112020001184T5 (en) | Powder particle component and particle size control system and control method of the system | |
| CN109705395A (en) | A kind of EPDM reclaimed rubber and its manufacturing method | |
| DE102022207329B3 (en) | Method for producing an electrode of a battery cell | |
| CN111421730A (en) | Stone paper tape casting equipment |
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 |