Polytetrafluoroethylene surface modified filter material and preparation method thereof
A technology of polytetrafluoroethylene and surface modification, applied in separation methods, chemical instruments and methods, filtration and separation, etc., to achieve the effects of easy industrialized mass production, enhanced binding force, and improved self-cleaning performance
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[0040] Embodiments of the present invention provide a method for preparing a polytetrafluoroethylene surface-modified filter material, comprising the following steps:
[0041] S1, prepare mixed solution A, including 1g / L-30g / L positive polyelectrolyte and 0.01mol / L-3mol / L strong electrolyte;
[0042] S2, preparing a dispersion B, including polytetrafluoroethylene nanoparticles with a mass fraction of 1.5% to 30%, and the polytetrafluoroethylene nanoparticles are uniformly dispersed in the dispersion B;
[0043] S3, immersing the filter material base in the mixed solution A, and drying the filter material base impregnated with the mixed solution A, to obtain a first composite filter material;
[0044] S4, immersing the first composite filter material in the dispersion B, and drying the first composite filter material soaked in the dispersion B to obtain a second composite filter material; and
[0045] S5, heating the second composite filter material at 320° C. to 400° C., and ...
Embodiment 1
[0067] A preparation method of polytetrafluoroethylene surface modified metal felt, comprising the following steps:
[0068] S1, prepare mixed solution A, comprise the sodium chloride of the polydiallyl dimethyl ammonium chloride of 4g / L and the sodium chloride of 0.05mol / L;
[0069] S2. Prepare dispersion B, including water-based polytetrafluoroethylene nanoparticles with a mass fraction of 6%, and fully stir and disperse;
[0070] S3. Immerse the metal felt in the mixed solution A, take it out after standing for 10 minutes, and bake it at 60°C for 20 minutes to obtain the first composite metal felt;
[0071] S4. Soak the first composite filter material obtained in step S3 in the dispersion B, take it out after standing for 20 minutes, and bake it at 60° C. for 20 minutes to obtain a second composite metal felt.
[0072] S5. Heat the second composite metal felt obtained in step S4 at 390° C. for 1 hour, and cool down to room temperature with the furnace to obtain a polytetra...
Embodiment 2
[0074] The preparation method is basically the same as in Example 1, except that the concentration of polydiallyldimethylammonium chloride in step S1 is 6g / L, and the mass fraction of aqueous polytetrafluoroethylene nanoparticle dispersion in step S2 is 8%, the second composite metal felt is heated at 380°C for 2 hours in step S5.
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