Method for Making Waterborne Polyurethane with a Reactive Functional Group and a Nanocomposite Made of the Same

摘要

A method for forming an aqueous polyurethane dispersion including providing an isocyanate (NCO)-terminated prepolymer with a side-chain reactive functional group by admixing (i) at least one diisocyanate, (ii) at least one difunctional polyol, (iii) a short-chain diol monomer having a side-chain reactive functional group or a modified clay thereof, (iv) at least one hydroxy carboxylic acid compound and (v) a hydrophilic cosolvent; neutralizing the NCO-terminated prepolymer with a tertiary amine; dispersing the NCO-terminated prepolymer in water; and admixing the NCO-terminated prepolymer with at least one chain extending agent comprising a hydrophilic diamine; wherein the short-chain diol monomer (iii) is expressed by structural formula (I):;;wherein, A is an azetidine-2,4-dione functional group;;or a malonamide-linked alkyl group;;and B is a nitrogen-linked di-hydroxy terminal group;;or tertiary amine-linked di-hydroxy terminal group;;wherein IDD was synthesized by methylenedi-p-phenyl diisocyanate and isobutyryl chloride using triethylamine as catalyst.

主权项

1. A process for forming an aqueous polyurethane dispersion and/or a polyurethane/clay nanocomposite dispersion, the process comprising: providing an isocyanate (NCO)-terminated prepolymer with a side-chain reactive functional group by admixing (i) at least one diisocyanate, (ii) at least one difunctional polyol, (iii) a short-chain diol monomer having a side-chain reactive functional group or a modified clay thereof, (iv) at least one hydroxy carboxylic acid compound and (v) a hydrophilic cosolvent; neutralizing the NCO-terminated prepolymer with a tertiary amine; dispersing the NCO-terminated prepolymer in water; and admixing the NCO-terminated prepolymer with at least one chain extending agent comprising a hydrophilic diamine; wherein the short-chain diol monomer (iii) is expressed by structural formula (I):wherein, A is an azetidine-2,4-dione functional groupor a malonamide-linked alkyl groupand B is a nitrogen-linked di-hydroxy terminal groupor tertiary amine-linked di-hydroxy terminal group