CN207676981U - A kind of production system of Rapid Extraction oil-containing substrate - Google Patents
A kind of production system of Rapid Extraction oil-containing substrate Download PDFInfo
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- CN207676981U CN207676981U CN201820072487.8U CN201820072487U CN207676981U CN 207676981 U CN207676981 U CN 207676981U CN 201820072487 U CN201820072487 U CN 201820072487U CN 207676981 U CN207676981 U CN 207676981U
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- extraction
- stretching
- substrate
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- oil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The utility model is related to the production system of Rapid Extraction oil-containing substrate, including live-roller, pre-stretching device, extraction equipment, the pre-stretching device is connect with extraction equipment by the live-roller.The utility model solves the problems, such as that thick substrate extraction is difficult, substantially reduces extraction time.
Description
Technical field
The present invention relates to battery diaphragm production technical fields, and in particular to a kind of production system of Rapid Extraction oil-containing substrate
System.
Background technology
Lithium rechargeable battery is obtained because its energy density is big, has extended cycle life in consumer electronics, electric vehicle and energy storage
It is more and more widely used.As more and more diaphragm production lines are gone into operation, the competition between diaphragm enterprise is more and more fierce.Mesh
Before, most enterprises are to increase producing line quantity, to improve yield.There is no any technical innovation, and invest greatly, the period is long.
Once not up to scheduled target, it will cause great loss.So promoting product yield, reducing production cost and technology wound
It will be newly the direction of diaphragm Future Development of Enterprise.
In BOPP industries, the film produced is nonporous film, without pore former will be added in film and extracts, therefore
The speed of production line can reach 500m/min, and breadth reaches 10m.For diaphragm production line because of the limitation of extraction process, speed is current
In 30-50m/min, breadth is in 4m or so.
The production technology of diaphragm is first to stretch to extract afterwards at present, and rate of extraction is difficult to be promoted, and restricts the big of producing line speed
Width is promoted.Difficulty is as follows：1. rate of extraction is accelerated, the length of producing line will be lengthened, increases equipment investment；2. rate of extraction adds
Soon, increase operational difficulty, to personnel's technical ability and equipment precision requirement higher.3. rate of extraction is accelerated, will take out of a large amount of
Solvent, cause the problem of appearance such as film surface piebald, striped.
Therefore lithium battery diaphragm production in design one kind can avoid the above problem, can quickly and efficiently it is high-quality into
Row extraction is one of the field urgent problem to be solved.
Invention content
In view of problems of the prior art, the object of the present invention is to provide a kind of with Rapid Extraction, efficient, high-quality
The advantages that Rapid Extraction oil-containing substrate production system.
The purpose of the present invention is be achieved through the following technical solutions：
A kind of production method of Rapid Extraction oil-containing substrate, includes the following steps：
S1：Pre-stretching
The oil-containing substrate that thickness is 0.5-3mm is put into pre-stretching device and is pre-stretched, pre-stretching substrate is obtained；
S2：Ultrasonic extraction
The pre-stretching substrate that step S1 is obtained is transported in extraction equipment by live-roller and carries out ultrasonic extraction, described
Contain extractant in extraction equipment, by live-roller after extraction, leaves extraction equipment, obtain the substrate that deoils, to removing oil base
Piece is stretched, is thermally treated resulting in micro-pore septum, and the residual oil content of the micro-pore septum is below 5%.
The oil-containing substrate is after heating mixed melting in double screw extruder by polyethylene and pore former, cooling
It arrives.
The viscosity average molecular weigh of the polyethylene is 300,000-250 ten thousand, and the mass percent of the polyethylene is 15%-50%,
The mass percent of the pore former is 50%-85%, and the pore former is mineral oil or artificial synthesized oil.
The lateral multiplying power that is pre-stretched in step sl or longitudinal multiplying power is 0.1-5 times, temperature is 85-130 DEG C, pre-stretching side
Formula is unidirectional pre-stretching or two-way pre-stretching.
The power density of ultrasonic wave is 1.0-2.95w/cm in step s 22, frequency 10-200kHz；The extractant
It dissolves each other with pore former, and the extractant is one kind in chloroform, dichloromethane or decane, extraction time 3-5min.
The residual oil content of the micro-pore septum is below 1%.
The present invention also provides a kind of production system of Rapid Extraction oil-containing substrate, including pre-stretching device and extraction equipment,
The live-roller for transmitting pre-stretching substrate is equipped between the pre-stretching device and extraction equipment.
Extractant is filled in the extraction equipment, and the extraction equipment includes extraction tank and is located under the extraction tank
Multiple supersonic generators of side.
Multiple live-rollers are equipped in the extraction tank, multiple live-roller is located in the extraction tank under the liquid level of extractant
And between extraction trench bottom, multiple live-roller constitutes W types or V-structure.
The pre-stretching device is stretching-machine.Formula and common sense
The present invention uses different supersonic frequencies, extraction time effective to remove in substrate by the substrate to pre-stretching
Pore former, the evaluation for effect of extracting are generally characterized using residual oil content and ventilative Gurley values.Residual oil content is smaller, then extracts
Take effect better.The Gurley values of microporous barrier are lower, and the gas permeability for characterizing microporous barrier is better.
Residual oil content：
Microporous barriers of the 10cm × 10cm through Overheating Treatment is cut, with electronics capacity of balance its weight m1, microporous barrier is put into
10min is extracted in extraction tank, taking-up, which is put in draught cupboard, dries, again its weight of weighing m2, then the residual oil content of the microporous barrier is：
(m1-m2)/m1*100%.
It is discovered by experiment that the thickness of microporous barrier is 12 μm, residual oil content influences such as the following table 1 institute the ventilative value of microporous barrier
Show.
Table 1
| Residual oil content (%) | 3.4 | 2.1 | 0.8 | 0.4 |
| Ventilative value (s/100ml) | 485 | 367 | 238 | 204 |
Table 1 the results show that when residual oil content be less than 1% when, the ventilative value ＜ 300s/100ml of microporous barrier, thus the present invention with
Standards of the residual oil content ＜ 1% as evaluation effect of extracting.
The device have the advantages that：
The present invention first carries out a degree of pre-stretching to oil-containing substrate, reduces the interface of polyethylene and pore former in substrate
Tension makes extractant be easier to pore former into line replacement；Then ultrasonic extraction is used to the substrate after pre-stretching, accelerates extraction
The diffusion of agent in the substrate is taken, extraction time is shortened, extraction efficiency is improved, therefore, using ultrasonic extraction oil-containing substrate, Ke Yiyou
The raising extraction efficiency of effect shortens the production time.
Description of the drawings
Fig. 1 is the structural schematic diagram of the production system of Rapid Extraction oil-containing substrate of the present invention.
Wherein, 1- pre-stretching devices, 2- supersonic generators, 3- live-rollers, 4- extraction equipments, 40- live-rollers, 5- oil-containings
Substrate.
Specific implementation mode
The present invention provides a kind of production systems of Rapid Extraction oil-containing substrate, specific to illustrate with specific embodiment below
Embodiment, it should be understood that the specific embodiments described herein are merely illustrative of the present invention, is not used to limit this hair
It is bright.
Embodiment 1
The pore-forming for being 70% with mass percent by the polyethylene (viscosity average molecular weigh is 800,000) that mass percent is 30%
Agent (at 40 DEG C, kinematic viscosity 45-55mm2/ s) mixing, double screw extruder is added, is fully melted at 195 DEG C, melt warp
Extruder die head is crossed, forms the oil-containing substrate of 1mm thickness on 25 DEG C of chill roll, oil-containing substrate carries out lateral prestretching at 120 DEG C
It stretches to form pre-stretching substrate, stretching ratio is 2 times (pre-stretching meron thickness is 0.5mm), is then transported by live-roller
Enter the extraction tank of supersonic generator is housed, 3min is extracted under conditions of 17kHz, forms the substrate that deoils, deoil substrate later
Enter in stretching-machine under the drive of live-roller, lateral, longitudinal 5 times of stretchings are carried out at 120 DEG C, obtain film, film passes through
130 DEG C of heat treatments, form the micro-pore septum for having and stablizing pore structure, and the residual oil content of microporous barrier, and test are measured by weighing method
The ventilative value of microporous barrier, the results are shown in Table 2.
Comparative example 1：
The pore-forming for being 70% with mass percent by the polyethylene (viscosity average molecular weigh is 800,000) that mass percent is 30%
Agent (at 40 DEG C, kinematic viscosity 45-55mm2/ s) mixing, double screw extruder is added, is fully melted at 195 DEG C, melt warp
Extruder die head is crossed, forms the oil-containing substrate of 1mm thickness on 25 DEG C of chill roll, oil-containing substrate carries out lateral prestretching at 120 DEG C
It stretches to form pre-stretching substrate, stretching ratio is 2 times (pre-stretching meron thickness is 0.5mm), and then oil-containing substrate passes through transmission
Roller is carried into extraction tank and carries out conventional extraction (no supersonic generator), 8min is extracted under conditions of 17kHz, formation is deoiled
Substrate, the substrate that deoils later enter under the drive of live-roller in stretching-machine, and lateral, longitudinal 5 times of stretchings are carried out at 120 DEG C,
Film is obtained, film forms the micro-pore septum for having and stablizing pore structure, micropore is measured by weighing method by 130 DEG C of heat treatments
The residual oil content of film and the ventilative value of test microvia film, the results are shown in Table 2.
Comparative example 2：
The pore-forming for being 70% with mass percent by the polyethylene (viscosity average molecular weigh is 800,000) that mass percent is 30%
Agent (at 40 DEG C, kinematic viscosity 45-55mm2/ s) mixing, double screw extruder is added, is fully melted at 195 DEG C, melt warp
Extruder die head is crossed, forms the oil-containing substrate of 0.5mm thickness on 25 DEG C of chill roll, then oil-containing substrate is transported by live-roller
Into the extraction tank equipped with supersonic generator, 15min is extracted under conditions of 17kHz, is formed the substrate that deoils, is removed oil base later
Piece enters under the drive of live-roller in stretching-machine, and lateral, longitudinal 5 times of stretchings are carried out at 120 DEG C, obtain film, film warp
130 DEG C of heat treatments are crossed, the micro-pore septum for having and stablizing pore structure is formed, the residual oil content of microporous barrier are measured by weighing method, and survey
The ventilative value of microporous barrier is tried, the results are shown in Table 2.
Comparative example 3：
The pore-forming for being 70% with mass percent by the polyethylene (viscosity average molecular weigh is 800,000) that mass percent is 30%
Agent (at 40 DEG C, kinematic viscosity 45-55mm2/ s) mixing, double screw extruder is added, is fully melted at 195 DEG C, melt warp
Extruder die head is crossed, forms the oil-containing substrate of 0.5mm thickness on 25 DEG C of chill roll, then oil-containing substrate is transported by live-roller
Conventional extraction (no supersonic generator) is carried out into extraction tank, extracts 60min, forms the substrate that deoils, the substrate that deoils later exists
Enter in stretching-machine under the drive of live-roller, lateral, longitudinal 5 times of stretchings are carried out at 120 DEG C, obtain film, film passes through 130
DEG C heat treatment, forms to have and stablizes the micro-pore septum of pore structure, pass through residual oil content and test microvia that weighing method measures microporous barrier
The ventilative value of film, the results are shown in Table 2.
Table 2 is the lithium ion secondary battery membrane of different extraction modes and different extraction time productions
It by comparative example 1 and comparative example 1, selects ultrasonic extraction that can shorten extraction time, is implemented by comparing
Example 1 and comparative example 2, extraction time can be shortened by carrying out pre-stretching before extraction, be pre-stretched the influence to extraction time and be better than
Ultrasonic wave can effectively reduce extraction time by pre-stretching with ultrasound.
Note：Ultrasonic extraction frequency is 17kHz.Pore former in the present invention is mineral oil or artificial synthesized oil.
Therefore the present invention solves the problems, such as that thick oil-containing substrate extraction is difficult.Pre-stretching in the present invention can be unidirectional prestretching
Stretch (such as transverse pre-tension or longitudinal pre-stretching) or two-way pre-stretching (longitudinal pre-stretching and transverse pre-tension), wherein it is longitudinal for containing
Oil base piece direction of travel.The process of the present invention is the standard using residual oil content ＜ 1% as evaluation effect of extracting, but and unlimited
In residual oil content ＜ 1%, residual oil content can be 5% hereinafter, preferably 3% hereinafter, best residual oil content below 1%.
The viscosity average molecular weigh of polyethylene in the present invention is 300,000-250 ten thousand, and the mass percent of polyethylene is 15%-
50%, the mass percent of pore former is 50%-85%, and above-described embodiment in the present invention is the viscosity average molecular weigh with polyethylene
It is 800,000, the mass percent of polyethylene is 30%, for the mass percent of pore former is 70%.
Embodiment 2
Shown in referring to Fig.1, the present invention relates to a kind of production systems of Rapid Extraction oil-containing substrate, including pre-stretching device 1
With extraction equipment 4, it is equipped between the pre-stretching device 1 and extraction equipment 4 for transmitting pre-stretching substrate drive roller 3.It is described
Extractant is filled in extraction equipment 4, and the extraction equipment 4 is multiple super including extraction tank and below the extraction tank
Sonic generator 2；Multiple live-rollers 40 are equipped in the extraction tank, under the liquid level of the extraction tank between extraction trench bottom
Multiple live-rollers 40 are equipped with, multiple live-rollers 40 constitute W types or V-structure.The pre-stretching device 1 is to stretch
Machine.
Further, one end of the extraction equipment 4 is additionally provided with stretching device and annealing device, the extraction equipment 4,
Live-roller (not shown) is equipped between stretching device and the adjacent stream oriented device of annealing device, the stretching device is to draw
Machine is stretched, annealing device is heat setting device.
Oil-containing substrate 5 when in use, is put into the pre-stretching device 1 by the system first, is filled in the pre-stretching
Set the stretching carried out in 1 laterally or longitudinally, after pre-stretching device 1 formed pre-stretching substrate (the lateral multiplying power of pre-stretching or
Longitudinal multiplying power is 0.1-5 times, and temperature is 85-130 DEG C), which is filled by the extraction that is conveyed into of live-roller 3
In setting 4, the extractant in the extraction equipment 4 extracts pore former in pre-stretching substrate, super in the extraction equipment 4
Sonic generator 2 is opened, and the ultrasonic wave can speed up the diffusion of extractant in the substrate, pore former is made to be easier to be extracted agent
It cements out, effectively raises extraction efficiency, shorten extraction time, the wherein power density of ultrasonic wave is 1.0-2.95w/
cm2, frequency 10-200kHz, extraction time can shorten to 3-5 minutes.The pre-stretching substrate is formed after extraction equipment 4
The substrate that deoils, the substrate that deoils continue to enter the stretching device, the stretching under the drive of live-roller 40 in extraction tank
Device carries out stretching transversely or longitudinally to the substrate that deoils, and forms it into film, the film is under the drive of live-roller later
Into annealing device, the micro-pore septum for having and stablizing pore structure is formed after being handled into heat treating device.Extraction in the present invention
It can be one kind in chloroform, dichloromethane or decane to take agent.
The production system of Rapid Extraction oil-containing substrate of the present invention, it is simple in structure, easy to operate, can effectively improve
Extraction efficiency shortens the production cycle, reduces enterprise's production cost.
Finally it should be noted that：Above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail referring to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：
It can still modify to the technical solution recorded in previous embodiment, or to which part or all technical features into
Row equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (4)
1. a kind of production system of Rapid Extraction oil-containing substrate, which is characterized in that described including pre-stretching device and extraction equipment
The live-roller for transmitting pre-stretching substrate is equipped between pre-stretching device and extraction equipment.
2. production system according to claim 1, which is characterized in that be filled with extractant, and institute in the extraction equipment
It includes extraction tank and multiple supersonic generators below the extraction tank to state extraction equipment.
3. production system according to claim 2, which is characterized in that be equipped with multiple live-rollers in the extraction tank, this is more
A live-roller is located in the extraction tank under the liquid level of extractant and extracts between trench bottom；Multiple live-rollers constitute W types
Or V-structure.
4. according to claim 1-3 any one of them production systems, which is characterized in that the pre-stretching device is stretching-machine.
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| CN201820072487.8U CN207676981U (en) | 2018-01-16 | 2018-01-16 | A kind of production system of Rapid Extraction oil-containing substrate |
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| CN201820072487.8U CN207676981U (en) | 2018-01-16 | 2018-01-16 | A kind of production system of Rapid Extraction oil-containing substrate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247006A (en) * | 2019-06-11 | 2019-09-17 | 溧阳月泉电能源有限公司 | The production method of lithium ion secondary battery membrane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247006A (en) * | 2019-06-11 | 2019-09-17 | 溧阳月泉电能源有限公司 | The production method of lithium ion secondary battery membrane |
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