5 results about "Lipophobicity" patented technology

The invention provides an oriented piezoelectric hydrophilic fiber membrane with lasting oil-water separation capacity and a preparation method of the oriented piezoelectric hydrophilic fiber membrane, and belongs to the technical field of new materials. Polyvinylidene fluoride (PVDF) is selected as a raw material for electrostatic spinning, a precursor solution is prepared by regulating and controlling parameters, an oriented PVDF fiber membrane with excellent piezoelectric property is prepared by adopting a high-speed electrostatic spinning method, and then tannic acid is used for surface modification to prepare the hydrophilic hydraulic pressure electro-oriented PVDF fiber membrane. The fiber membrane can effectively screen and intercept oil drops in emulsion by utilizing surface hydrophilicity and underwater lipophobicity, meanwhile, the surface of the fiber membrane is stimulated to generate piezoelectric response under the water flow pulse effect, directional migration of charged oil drops is achieved through electrostatic interaction between fibers and the oil drops, the anti-fouling performance of the fiber membrane is enhanced, and the anti-fouling performance of the fiber membrane is improved. Furthermore, the preparation method is simple, feasible, green and environment-friendly, so that the preparation method has a great application prospect.

The invention belongs to the technical field of membrane separation, and particularly relates to a polydimethylsiloxane membrane based on fluorocarbon molecular brush regulation and a preparation method thereof, the polydimethylsiloxane membrane comprises a porous support layer and a separation layer formed on the support layer; the separation layer is formed by modified polydimethylsiloxane, the modified polydimethylsiloxane is obtained by copolymerizing vinyl-terminated polydimethylsiloxane and a perfluoroalkene monomer, and the structural general formula of the perfluoroalkene monomer is CF3 (CF2) n-CH = CH2. According to the invention, the perfluoroalkene monomer is introduced as a molecular brush, so that the perfluoroalkene monomer can be used as a molecular brush, and the molecular brush can be used as a solvent; the free volume distribution of the PDMS membrane is accurately controlled, the gas permeation selectivity is remarkably improved, the breakthrough improvement is mainly derived from high hydrophobicity and lipophobicity, low surface energy and rigid structures of perfluorinated chain segments, the distance between PDMS chain segments is effectively enlarged due to the characteristics, meanwhile, the strong electronegativity of fluorine atoms can be effectively improved through quadrupole moment interaction with gas molecules, and the gas permeation selectivity is improved. The adsorption selectivity is enhanced, and more continuous gas specific transmission channels are formed.

The invention provides an organic silicon modified polyacrylate emulsion, a preparation method and application of the organic silicon modified polyacrylate emulsion as false eyelash glue. The preparation method comprises the following steps: adding an emulsifier into a reaction kettle for bottoming, heating and uniformly stirring, dropwise adding a premixed solution S1 containing a hard monomer, a soft monomer, a trifunctional cross-linking agent, an initiator and organic silicon, and continuously keeping the temperature for polymerization reaction after dropwise adding to form a seed solution; dropwise adding a premixed solution S2 containing a hard monomer, a soft monomer, an emulsifier, an initiator and a bifunctional cross-linking agent into the seed solution, carrying out a heating reaction after dropwise adding is finished, and carrying out heat preservation after the reaction is finished; performing VOC (volatile organic compound) removal treatment on the emulsion subjected to heat preservation, so as to obtain the organic silicon modified polyacrylate emulsion. The organic silicon modified polyacrylate emulsion has good physiological inertness, softness and hydrophobicity and lipophobicity, and the polyacrylate emulsion has the advantages of being high in gel forming speed, high in viscosity, small in smell, high in emulsion stability and the like.

A method for the tunable derivatization of cellulose-based materials to obtain water resistance or water-lipid resistance is described, comprising a) contacting a cellulose-based material with a formulation conferring water resistance or water-lipid resistance, the formulation comprising one or more sugar fatty acid esters (SFAE) and one or more binders; and b) binding the SFAE and the binder to the surface of the cellulose-based material to obtain a bound cellulose-based material having water resistance or water-lipid resistance, wherein in the bound cellulose-based material the SFAE is present on the surface of the cellulose-based material in a weight of at least 0.1 g / m 2 The so treated material has higher hydrophobicity, lipophobicity, barrier function and mechanical properties and can be used in any application where these features are required.