TPU waterproof and breathable film and preparation method thereof
A waterproof breathable membrane and a technology for preparation steps, applied in the field of synthetic materials, can solve the problems of poor moisture permeability, difficult processing, unstable products, etc., and achieve easy performance control, simple preparation process, good tensile strength and elongation at break. rate effect
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[0028] The preparation method of said a kind of TPU waterproof breathable membrane adopts following preparation steps:
[0029] 1) Preparation of porous graphene with excellent dispersibility: disperse graphene oxide in water, then add hydrogen peroxide solution, react at 60-100°C for 2h-6h, after the reaction is completed, add a reducing agent to continue the reaction for 1-2h, then centrifuge or The solid product was collected by filtration to obtain porous graphene.
[0030] 2) Preparation of the modified porous graphene dispersion: disperse the porous graphene obtained in step 1) in the DMF solution, then add a hydrophobic compound, react for 30 to 60 minutes, add an appropriate amount of porogen, and stir evenly to obtain a modified porous graphene Graphene dispersion;
[0031] 3) Preparation of TPU solution: put TPU in DMF, then stir at 70-90°C to dissolve completely; add an appropriate amount of porogen, and stir evenly;
[0032] 4) Mix the porous graphene dispersion ...
Embodiment 1
[0043] The preparation method of TPU waterproof breathable membrane in the present embodiment, concrete steps are as follows:
[0044] 1) Preparation of porous graphene: disperse graphene oxide in water, then add hydrogen peroxide solution, react at 90°C for 4 hours, add sodium ascorbate after the reaction is completed, continue to react for 1 hour, and centrifuge to collect the solid product to obtain porous graphene. The concentration of graphene is 10mg / mL, 30%H 2 o 2 The dosage is 1 / 40 of the mass of graphene oxide;
[0045] 2) Preparation of modified porous graphene dispersion: disperse the porous graphene obtained in step 1) in DMF solution, then add perfluorooctyltriethoxysilane, react for 30-60min, then add sodium bicarbonate to form pores agent, stirred evenly to obtain a modified porous graphene dispersion, wherein the consumption of perfluorooctyltriethoxysilane is 1% of the porous graphene, and the consumption of the porogen is 1% of the TPU;
[0046]3) Preparat...
Embodiment 2
[0049] The preparation method of TPU waterproof breathable membrane in the present embodiment, concrete steps are as follows:
[0050] 1) Preparation of porous graphene: disperse graphene oxide in water, then add hydrogen peroxide solution, and react at 70°C for 6 hours. The concentration of graphene is 2mg / mL, 30%H 2 o 2 The dosage is 1 / 10 of the mass of graphene oxide;
[0051] 2) Preparation of modified porous graphene dispersion: disperse the porous graphene obtained in step 1) in DMF solution, then add perfluorooctyltrimethoxysilane, react for 30-60min, then add ammonium bicarbonate porogen , stirring evenly to obtain a modified porous graphene dispersion, wherein the consumption of perfluorooctyltrimethoxysilane is 0.2% of the porous graphene, and the consumption of the porogen is 0.5% of the TPU;
[0052] 3) Preparation of TPU solution: put TPU in DMF, then stir at 70°C to dissolve completely; add ammonium bicarbonate porogen, stir evenly, wherein the mass volume rat...
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