1H,1H,2H,2H-Perfluorooctyltriethoxysilane CAS 51851-37-7

A method for preparing a flexible carbon fiber with super-amphiphobic properties, comprising the following steps:

1. Dissolve polyacrylonitrile and manganese acetylacetonate in N,N‒dimethylformamide to form a uniform electrospinning solution, and prepare nano-spun fibers through electrospinning technology.
2. After the nano-spun fiber is pre-oxidized, it is placed in a nitrogen atmosphere for high-temperature carbonization to obtain manganese-doped carbon nanofibers.
3. Soak the obtained manganese-doped carbon nanofibers in an ethanol solution of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS) to obtain a superamphiphobic flexible carbon material.

The present invention prepares manganese-doped polyacrylonitrile uniform nanofibers by means of electrospinning technology and using N,N-dimethylformamide as a solvent. Then, after high-temperature carbonization treatment, a flexible nanofiber film carbon material was prepared, and the carbon fiber was characterized by means of a scanning electron microscope. It can be seen that the surface of the fiber has a certain roughness. Soak the carbon fibers in 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS) ethanol solution, dry and cool for performance testing. The test results show that the flexible carbon fibers have certain superamphiphobic properties. properties, and has important applications in the field of superamphiphobic and self-cleaning materials. The process is simple, the shape of the spinning fiber can be adjusted, and it is green and environmentally friendly. The average size of the spun carbon fiber is 300-450 nm, and the prepared carbon fiber with superamphiphobic properties exhibits a contact angle of about 155° and a rolling angle of about 4° at different pHs. The contact angle to different oils is about 152°. The flexible carbon fiber with superamphiphobic properties prepared by the method of the present invention has the advantages of light weight, bendability, easy portability, low production cost, etc., and can expand the application field of superamphiphobic interface materials, such as coating on the hull of ships, fuel On the storage tank, it can achieve anti-fouling and anti-corrosion effects; when used in the transportation of oil pipelines, it can prevent oil from adhering to the pipeline, thereby reducing energy loss during transportation; modify textiles with super amphiphobic materials; and in construction and The glass used in automobiles requires that it must have functions such as waterproof, anti-fog, self-cleaning and low radiation.

Features of the present invention: the addition of a small amount of manganese acetylacetonate can improve the morphology of nanofibers, and the carbon fibers obtained after carbonization have good flexibility. Select the appropriate pre-oxidation temperature to make the fiber form a stable trapezoidal structure for carbonization at high temperature; the prepared flexible carbon fiber, after 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS) treatment, Flexible carbon materials with superamphiphobic properties can be obtained.

A superhydrophobic nanoparticle-polyamide nanocomposite reverse osmosis membrane and a preparation method thereof, comprising the following steps:

1. Using metal alkoxide and 1H,1H,2H,2H-perfluorodecyltriethoxysilane or 1H,1H,2H,2H-perfluorooctyltriethoxysilane as precursors, using sol-gel Preparation of superhydrophobic fluorinated metal oxide nanoparticles by glue method.
2. Dissolving aromatic polyfunctional amine with a mass ratio of 0.5%~5% and camphorsulfonic acid-triethylamine salt with a mass ratio of 1~10% in water to obtain an aqueous phase solution.
3. Dissolve the aromatic polyfunctional acid chloride compound with a mass ratio of 0.05%~0.5% in n-hexane or Isopar series solvents to obtain an organic phase solution
4. Uniformly dispersing the superhydrophobic fluorinated metal oxide nanoparticles obtained in step 1 in the organic phase solution obtained in step 3 at a mass/volume ratio of 0.04% to 10%.
5. The aqueous phase solution obtained in step 2 and the organic phase solution containing superhydrophobic fluorinated metal oxide nanoparticles obtained in step 4 are interfacially polymerized on a polysulfone or polyethersulfone support layer to obtain a superhydrophobic nanoparticle-polyamide nanocomposite Reverse osmosis membrane.

Advantage:

1. This method solves the technical problems that traditional nanocomposite reverse osmosis membranes face, such as easy aggregation of nanoparticles and poor dispersion of hydrophilic particles in the hydrophobic polymer matrix.
2. In the obtained composite membrane, the inorganic nanoparticles are uniformly dispersed, and the salt interception performance is significantly improved.
3. The present invention has the advantages of simple operation, low cost, and low equipment requirements, and the obtained membrane has better salt rejection rate and anti-pollution ability.