Fluorinated polyurethane and preparation method thereof

Abstract

The invention discloses fluorinated polyurethane and a preparation method thereof. The fluorinated polyurethane is prepared through the steps: fluoroalkyl-containing polyether glycol and diisocyanate perform addition polymerization reaction, a tin catalyst is utilized to catalyze, a chain extender is utilized to extend a chain, and an amino silane coupling agent is added to seal ends. A product contains a fluorine-containing polyether block, the fluorine content is high, fluoroalkyl on a polyether lateral group is prone to generating microphase separation and surface migration, polyurethane surface energy is low, and the fluorinated polyurethane is easy to store and cure as the silane coupling agent is utilized to seal the ends. A water contact angle of a coating prepared from the fluorinated polyurethane is higher than 110 degrees, and the coating has excellent water repellency.

Description

technical field

[0001] The invention relates to a polyurethane, in particular to a fluorine-containing polyurethane obtained by addition polymerization of side chain perfluoroalkyl polyether glycol and diisocyanate and a preparation method thereof, belonging to the field of polyurethane and fine chemicals. Background technique

[0002] Polyurethane is a block-type polymer formed by the addition polymerization of polyether and diisocyanate with alternately bonded soft segments and hard segments. Its unique molecular structure and aggregated structure enable polyurethane to have excellent mechanical properties such as toughness and strength. And has excellent oil resistance, wear resistance and other properties. Because of this, polyurethane has become one of the most widely used polymer materials today. However, traditional polyurethane materials have insufficient weather resistance and water resistance. Because these polyurethanes use diisocyanates containing aromatic ring ...

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