One kind of waterborne polyurethane membrane and its applications

• Main Authors: HSU, YUN-FEI, TSAI, YEN-LING, LEE, HSUNING, TSAI, CHUN-EN
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2017
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

The manufacturing of one kind of waterborne polyurethane membrane and its applications are reported in this invention. The main component of this type of membrane is the polyurethanes that their main-chains contain bis(ethoxyphenyl)fluorene units. In the preparation of this type of membrane, prepolymers were firstly prepared by the reaction between polyisocyanates and polyols containing cardo and hydrophilic units. Then water was added to the prepolymers to form the waterborne prepolymer dispersions. The special kind of waterborne polyurethane dispersion was finally obtained by the reaction between prepolymers and chain extenders. In the reaction, the polymeric molecular weight is increased by the combination of NCO group in the prepolymer and NH2 group in the chain extender. The dispersions can be coated or be cast to form thin films. These thin films possess outstanding thermal resistance. Also, these thin films have good permeation separation function for the water/solvent mixtures, i.e. they are suitable