The effect of the soft-segment constitution of Waterborne Polyurethane on the Water Vapor Permeability and Water Resistance of Foam Coated Nylon Fabrics

• Main Author: 劉慧貞
• Other Authors: Ming Hsiung,Yen
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/30717507304987758495

碩士 === 國立臺灣科技大學 === 高分子工程系 === 91 === The study was used Dicyclohexylmethane diisocyanat（H12MDI）as the hard segment、ether Polytetramethylene glycol（PTMG）series（Molecular weight：650、1000、1400、2000）and ester Polycarprolactone（PCL）series（Molecular weight：550、1250、2000） polyols as the soft segment、2,2-Bis（hydromethyl）propionic acid（DMPA）as the anionic disperse center, use Triethylamine（TEA）as the neutralizer and Ethylenediamine（EDA）as the chain extender that synthesizes anionic water borne polyurethane. Then we was researched the different type and molecular weight of soft segment for the effect of coated Nylon fabric with water vapor permeability and water resistance on foam finishing and micro-phase structure of cast film, further to discuses the effect on composition of PU soft segment, ester type PU had better water resistance than ether type, but poor water vapor permeability. Because of ester type PCL is hydrophobic, and ether type is hydrophilic. In foam finishing aspect, regardless of coated fabrics of ester type PU or ether type PU are have better water vapor permeability than traditional finishing. On ether PU aspect, in PTMG 1000 coated fabric have batter physical equilibrium in water vapor permeability and water resistance and better than traditional method. Because of foam break down could form continuous micro holes in predrying of foam finishing. When molecular weight increase to 1400 and 2000, because of foam ratio and bigger foams, result water vapor permeability to keep unvarying and decrease water resistance very much. Ester type PCL finishing fabric have reduced water resistance and induce water vapor permeability. In different curing terms, no matter ester type or ether type that can produce well water vapor permeability and water resistance that can in proper predrying temperature that can produce continues micro porous and better than unpredrying. In all kinds of molecular weight water borne PU foam coated fabric had well water vapor permeability and poor water resistance in more low temperature（80℃）and more short time（1min）to predrying that can’t predry complete and formed bigger holds. There had high water resistance in high predrying temperature that similar to unpredrying condition that is fixed before formed holds and to form small and no continuous holds inside film.