Hydrophobic and oleophilic-hydrophilic underwater oleophobic thin oil film as well as adjustment and control method, preparation process and application thereof
A film and super-oleophobic technology, applied in non-woven fabrics, textiles and papermaking, etc., can solve problems such as poor emulsion separation effect, limited application range of oil-water separation membrane, and inability to complete controllable conversion of omentum membrane.
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[0114] 1. Preparation of Polyurethane / SiO2 Nanoparticle Composite Film
[0115] 1.1 Preparation of polyurethane
[0116] The synthesis of polyurethane is divided into two steps (such as figure 1 Shown): the first step is the synthesis of polyurethane prepolymer; the second step is the hyperbranched chain extension of polyurethane prepolymer by chain extender TEA.
[0117] (1) Synthesis of prepolymer
[0118] Weigh a certain amount of MDI into a three-necked flask, add an appropriate volume of DMF, and completely dissolve the MDI at room temperature under a nitrogen atmosphere. Then take a quantitative amount of PPG600 and add it dropwise into the reactor, and raise the temperature of the oil bath to 70-80°C. After the dropwise addition, the reaction continued for about 4 hours.
[0119] (2) TEA chain extension reaction
[0120] After the above-prepared isocyanate-terminated prepolymer, the metered chain extender TEA was slowly added dropwise to the three-necked reaction ...
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