A kind of fluorine-containing polyurethane and preparation method thereof

Abstract

The invention discloses a fluorine-containing polyurethane and a preparation method thereof. Addition polymerization reaction of fluorine-containing alkyl polyether diol and diisocyanate, catalyzed by tin catalyst, chain extension by chain extender, adding aminosilane coupling agent to end capping, to prepare a fluorine-containing polyurethane; the product has Fluorine-containing polyether block, high fluorine content, the fluoroalkyl group located in the polyether side group is prone to microphase separation and surface migration, low surface energy of polyurethane, fluorine-containing polyurethane is terminated with silane coupling agent, easy to store and easy to cure . The coating prepared by the fluorine-containing polyurethane of the present invention has a water contact angle higher than 110° and excellent water repellency.

Description

technical field

[0001] The invention relates to polyurethane, in particular to a fluorine-containing polyurethane obtained by addition polymerization of side chain perfluoroalkyl polyether diol 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, which is formed by the addition and polymerization of soft segments and hard segments. Its unique molecular structure and aggregated structure make polyurethane have excellent mechanical properties such as toughness and strength. And has superior oil resistance, wear resistance and other properties. Because of this, polyurethane has become one of the most widely used polymer materials today. However, the traditional polyurethane materials have insufficient weather resistance and water resistance. Since these polyurethanes use diisocyanates co...

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