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Preparation of porous film material
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A technology of porous film and film sheet, which is applied to flat products, applications, electrical components, etc., can solve the problems of long processing process, a large amount of volatile solvents, chaotic pore structure, etc., and achieves fewer processing steps and good pore structure. , the effect of uniform distribution
Inactive Publication Date: 2011-05-11
FOSHAN JINHUI HIGH TECH OPTOELECTRONICS MATERIAL
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Abstract
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Problems solved by technology
The processing process of this method is long and complex, and the product has a large pore size and chaotic pore structure.
In addition, a large amount of volatile solvents are used in the production process, which pollutes the environment
Method used
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Embodiment 1
[0011] Embodiment 1, a kind of preparation method of porous film material, comprises the steps of following sequence:
[0012] ① The continuous phase resin material HDPE (high-density polyethylene) is 60% by weight, the separated phase resin material PP (polypropylene) is 40% by weight, and other additives and antioxidants 1010 are 1% by weight. The weight percentage is evenly mixed to make a blend;
[0013] ② making the obtained blend into a film sheet;
[0014] ③The prepared film sheet is stretched and phase-separated, that is, the film sheet is stretched in one or two directions, so that the junction between the molecules of the continuous phase resin material in the sheet and the molecules of the separated phase resin material Breakage occurs to generate gaps, thereby preparing a porous diaphragm material.
[0015] Wherein, the preparation of the blend in step ① can use an internal mixer, an open mill, or a twin-screw extruder to form. In the above molding method, the c...
Embodiment 2
[0023] Embodiment 2, a preparation method of a porous film material, the step ② prepares a film material with a thickness of 300um and a film width of 0.2m. In the step ③, the film sheet is biaxially stretched, first stretched longitudinally, the stretching temperature is 90°C, and the stretching ratio is 2.0 times, and then stretched transversely, the stretching temperature is 100°C, and the stretching ratio is 5 times. All the other are identical with embodiment 1.
Embodiment 3
[0024] Embodiment 3, a preparation method of a porous film material, the step ② is to prepare a film material with a thickness of 375um and a film width of 0.6m. In the step ③, the film sheet is biaxially stretched, first longitudinally stretched, the stretching temperature is 115°C, and the stretching ratio is 3.5 times, and then transversely stretched, the stretching temperature is 125°C, and the stretching ratio is 7.5 times. All the other are identical with embodiment 1.
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Abstract
The invention discloses a preparation method for porous membrane materials; continuous phase resin materials, separation phase resin materials and other additives are evenly mixed to prepare lending material; the blending material is made into thin film sheets which are then processed with tension phase separation, so that the joints between the molecules of the continuous phase resin materials and the molecules of the separation phase resin materials in the sheets are broken to form clearance holes, so as to get the material. The method of the invention has the advantages of simple technology, less processing procedures, low production costs and high efficiency. The molecules of different phase resin materials in the sheets are evenly distributed; through physical tension sheets, the intermolecular joints of different phase materials in the sheets are broken and form clearance holes which are evenly distributed and have good hole-shaped structures as well as good mechanical properties.
Description
technical field [0001] The invention relates to a method for preparing a film with a porous structure, in particular to a method for preparing a porous film material for a lithiumion battery. Background technique [0002] The diaphragm of a polymerlithium-ion battery is a polymerfilm material with a porous structure, which can provide ion channels for lithium ions in the battery, can improve the cycle charge and discharge time of the lithium-ion battery, and improve the performance of the lithium-ion battery to a certain extent. specific capacity, and can play a role in protecting the safe use of lithium-ion batteries. [0003] At present, the manufacturing methods of porous separators for polymer lithium batteries mainly include dry method and wet method. Dry method, adding a nucleating agent in the film sheet, after β nucleation, stretching the film sheet bidirectionally or uniaxially, causing the β crystalnucleus to collapse and form holes. The film material produce...
Claims
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Application Information
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