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A technology of film recovery and material recovery, applied in the field of lithium battery diaphragm production, can solve problems such as waste of raw materials and environmental pollution
Pending Publication Date: 2021-06-11
九江冠力新材料有限公司
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Problems solved by technology
If these waste films are not recycled, it will not only cause waste of raw materials, but also may cause pollution to the environment
Method used
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Embodiment 1
[0039] Collect the oil film scraps and pass the crusher to break the oil film scraps into small fragments with an area not larger than 1cm2, take a few small fragments for oil content test and measure the oil content as 60%;
[0040] The normal material batching tank of the production line includes 1t of PE powder and paraffin oil, of which paraffin oil accounts for 80% of the total mass;
[0041] 500kg of oil film fragments are transferred to the batching tank, and 500kg of paraffin oil is added to make recycled materials, so that the ratio of paraffin oil to the total mass of recycled materials is also 80%;
[0042] Heat the recycled material and the normal material at 120°C and stir for more than 2 hours;
[0043] Set the supply rate of recycled material and normal material to 10kg / h and 290kg / h respectively, pump them into the feeding hopper, plasticize in the twin-screw extruder, filter out impurities through the filter, and then pass through the mold Extrude through the...
Embodiment 2
[0045] Collect the dry film scraps and break the oil film scraps into small fragments with an area not larger than 1cm2 through a crusher, take a few small fragments for oil content test and measure the oil content as 0.2%;
[0046] The normal material batching tank of the production line includes 1t of PE powder and paraffin oil, of which paraffin oil accounts for 70% of the total mass;
[0047] 200kg of dry film fragments are transferred to the batching tank, and 465.3kg of paraffin oil is added to make recycled materials, so that the ratio of paraffin oil to the total mass of recycled materials is also 70%;
[0048] Heat the recycled material and the normal material at 120°C and stir for more than 2 hours;
[0049] Set the supply rate of recycled materials and normal materials to 15kg / h, 285kg / h, pump them into the feeding hopper, plasticize in the twin-screw extruder, filter out impurities through the filter, and then pass through the die Extrusion is carried out to obtai...
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Abstract
A waste film recovery method is used in a lithium battery diaphragm production process, and comprises the following steps: collecting waste films generated in the lithium battery diaphragm production process, and classifying and storing the collected waste films according to oil films and dry films; separately putting the oil films and the dry films into a crusher to be crushed, so that oil film fragments and dry film fragments are formed; placing the oil film fragments or the dry film fragments with the measured oil content in a mixing tank, adding paraffin oil to prepare a corresponding recycled material, and then heating and stirring; and pumping the recycled material and the normal material into a double-screw extruder according to a ratio through a pump, and extruding to form a recycled finished product diaphragm. According to the method, the waste films generated in normal production of the wet diaphragm are extruded and reprocessed again, so that the waste films are recycled, on one hand, the production cost is reduced by saving raw materials, on the other hand, the waste film treatment procedure is omitted, and pollution to the environment is avoided.
Description
technical field [0001] The invention relates to the technical field of production of lithium battery separators, in particular to a method for recycling waste membranes. Background technique [0002] During the production process of the wet lithium battery separator, a lot of waste film will be generated. Sources of waste film include: ①The oil film trim produced by cutting both sides after stretching (including pore forming agent: paraffin oil); ②The dry film trim generated by cutting the diaphragm according to the size required by the customer ( No paraffin oil); ③Waste film that does not meet the performance or appearance requirements during the production process. If these waste films are not recycled, it will not only cause waste of raw materials, but also may cause pollution to the environment. Contents of the invention [0003] Based on this, the purpose of the present invention is to provide a waste film recycling method, which recycles the waste film produced in...
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Application Information
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