Hybrid film containing fluorosilicone/silicon rubber, and preparation method and application thereof

Abstract

The invention discloses a hybrid film containing fluorosilicone / silicon rubber, which is prepared by the following steps: (1) mixing vinyltriethoxysilane and hydrogen-containing silicone oil, and dropwisely adding catalyst to react, thereby obtaining a crosslinking agent; (2) weighing silicon rubber, dissolving the silicon rubber in tetrahydrofuran, and dropwisely adding the crosslinking agent and catalyst to carry out crosslinking reaction; (3) adding tridecafluorooctyltriethoxysilane, regulating the pH value of the reaction system to 4.0-4.5, and reacting to obtain a solution containing fluorosilicone / silicon rubber; and (4) pouring the solution on a polyethylene terephthalate rubber sheet to form a film, and stripping the film from the rubber sheet after the solution solidifies, thereby obtaining the hybrid film containing fluorosilicone / silicon rubber. The hybrid film containing fluorosilicone / silicon rubber maintains the advantage of excellent gas permeability in the rubbery-state separation film, greatly increases the oxygen / nitrogen separation coefficient, has favorable film-forming properties and mechanical properties, and solves the problems of poor film-forming properties, low film strength and the like in the existing polymer film material.

Description

technical field [0001] The invention relates to the field of functional polymer membrane materials, in particular to a fluorine-containing siloxane / silicone rubber hybrid membrane and its preparation method and application. Background technique [0002] The material is the main factor that determines the performance of the membrane. Different materials have their specific permeability coefficients and separation coefficients (or gas selectivity) for different gases. At present, there are two main types of materials used to manufacture gas separation membranes: ① glassy polymer materials with aromatic groups on the main chain, such as polyimide, polycarbonate, polysulfone, etc., which have good gas Selectivity, but low gas permeability coefficient; ②rubbery materials, such as polydimethyl, polysiloxane, etc., which have high gas permeability coefficient, but low selectivity to gas. For polymer materials, the gas permeability coefficient and separation coefficient often confl...

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Problems solved by technology

[0005] Among the current general-purpose polymer membrane materials, polydimethylsiloxane (PDMS) has the highest oxygen permeability coefficient, and is also the earliest oxygen-rich membrane material used. The -Si-O-Si-bond pole on its main chain Easy to rotate internally, the molecular chain is very flexible, the symmetrical methyl side group hinders the approach of the polymer chain segment, the cohesive energy density is low, and the structure is loose, so that the entire polymer film forms an amorphous region with many gaps, with high The disadvantage is that the oxygen and nitrogen separation coefficient is low, and because the PDMS molecules have a helical three-dimensional structure, the interaction between the molecules is small, it is difficult to make ultra-thin, and there are problems such as poor film formation and poor film strength.

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