Porous composite film and preparation method thereof
A technology of composite film and porous film, which is applied in the field of composite film, can solve the problems of small specific surface area and inability to achieve good sensing, and achieve good composite effect
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Embodiment 1
[0024] The preparation method of porous composite film, comprises the following steps:
[0025] 1) Weigh 650g of polypropylene and 350g of cellulose acetate butyrate, mix them uniformly as the raw material of the outer film, then weigh 2000g of polypropylene as the polymer of the base film; put the raw material of the outer film and the polymer of the base film into the double-layer flow Film stretching machine, after double-layer casting film machine extrusion, unidirectional stretching and cooling forming process, a composite film (such as image 3 shown);
[0026] 2) Soak the composite film in an acetone solution, use acetone to extract cellulose acetate butyrate in the outer film 3, the outer film 3 forms the outer porous film 1, and obtain a porous composite film (such as figure 1 shown).
[0027] like figure 1 , the thickness of the outer porous film 1 in the porous composite film is 50 μm, and the thickness of the base film 2 is 100 μm, combining figure 2 As shown,...
Embodiment 2
[0029] 1) Weigh 900g of polyethylene and 100g of cellulose acetate butyrate, mix them evenly as the raw material of the outer film, then weigh 1000g of polyethylene as the base film polymer; put the outer film raw material and the base film polymer into the double-layer flow Film stretching machine, after double-layer casting film machine extrusion, unidirectional stretching and cooling forming process, a composite film (such as image 3 shown);
[0030] 2) The composite film is soaked in an acetone solution, and after utilizing acetone to extract cellulose acetate butyrate in the outer film, the outer film 3 forms the outer porous film 1, and the porous composite film (such as figure 1 shown).
[0031] like figure 1 , the thickness of the outer porous film 1 in the porous composite film is 100 μm, and the thickness of the base film 2 is 50 μm, combining figure 2 As shown, the average diameter of the pores in the outer layer porous film 1 is 5 μm.
Embodiment 3
[0033] 1) Weigh 700g of polyester and 300g of cellulose acetate butyrate, mix them evenly as the raw material of the outer film, then weigh 1500g of polyester as the polymer of the base film; put the raw material of the outer film and the polymer of the base film into the double layer Cast film machine, after double-layer cast film machine extrusion, uniaxial stretching and cooling molding process, a composite film (such as image 3 shown);
[0034] 2) the composite film is immersed in the acetone solution, and after utilizing acetone to extract cellulose acetate butyrate in the outer film, the outer film forms an outer porous film, and obtains a porous composite film (such as figure 1 shown).
[0035] like figure 1 , the thickness of the outer porous film 1 in the porous composite film is 65 μm, and the thickness of the base film 2 is 80 μm, combining figure 2 As shown, the average diameter of the pores in the outer layer porous film 1 is 1 μm.
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