Preparation method of metal oxide whisker-polyurethane composite material with monodispersity
A composite material and monodisperse technology, which is applied in the field of preparation of titanium oxide whisker-polyurethane composite materials, can solve problems such as complex manufacturing methods, inability to ensure uniform dispersion of metals or metal oxides, and poor controllability. Low requirements, improved performance, and good stability
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[0022] In the present embodiment, have the TiO of monodisperse feature The preparation method of whisker-polyurethane composite material comprises the steps:
[0023] A. Take TiO2 whiskers for surface pretreatment to adjust the surface chemical properties. After treatment, dry them in vacuum at 90°C and store them at constant weight for use. Pretreatment was used to adjust the wettability and charging characteristics of the TiO2 whisker surface. The pretreatment method can be surface modification or treatment mainly using coupling agent, self-assembled monomolecular film precursor, isopropanol and glycerol, etc. The purpose of this step is to obtain TiO2 whiskers with monodisperse characteristics. Pretreatment is only one of the ways to obtain TiO2 whiskers with monodisperse characteristics. One of the basis for judging whether to perform pretreatment is whether the whiskers are well dispersed. And it has a good match with polyurethane solution;
[0024] B. Prepare a medical...
Embodiment 1
[0032] Prepare a heptane solution of 0.5mM octadecyltrichlorosilane, add 2g of anatase TiO2 whiskers (0.5-1.5μm in diameter) into the heptane solution, react for 15s, and quickly rinse with a large amount of heptane solution Filter, and finally rinse with carbon tetrachloride three times, then use heptane twice, and vacuum-dry to thoroughly clean up the solvent adsorbed on the surface.
[0033] A medical polyurethane solution with a viscosity of about 500 centipoise (cP) was prepared by using 30 g of polyurethane masterbatch and 200 g of dimethylformamide solvent.
[0034] Take 0.06g of the treated TiO2 whiskers, add it to the polyurethane solution, and stir vigorously for 8h.
[0035] Get 52g of polyurethane solution containing TiO2 whiskers and place it on a watch glass, cover the surface of the watch glass, prepare a film by fume hood volatilization method, and the temperature condition is controlled at 25°C.
[0036] The titanium oxide whisker-polyurethane composite mater...
Embodiment 2
[0039] 2 g of whiskers (0.3-1 μm in diameter) with internal anatase configuration were selected as the reaction raw material. Since its surface properties matched that of the polyurethane solution and its dispersion was good, clean whiskers could be selected and used directly.
[0040] A medical polyurethane solution with a viscosity of about 230 centipoise (cP) was prepared using 40 g of polyurethane masterbatch and 200 g of tetrahydrofuran.
[0041] Take 0.2g TiO2 whiskers, add it to the polyurethane solution, and stir vigorously for 8h.
[0042] Get 48g of polyurethane solution containing TiO2 whiskers and place it on a watch glass, cover the surface of the watch glass, prepare a film by fume hood volatilization method, and the temperature is 20°C.
[0043] The titanium oxide whisker polyurethane composite material with monodisperse characteristics is taken out, washed with pure water for 2 to 4 hours, dried in vacuum, and stored at constant weight for use.
[0044] The ...
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