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Method for Making Waterborne Polyurethane with a Reactive Functional Group and a Nanocomposite Made of the Same
Method for Making Waterborne Polyurethane with a Reactive Functional Group and a Nanocomposite Made of the Same
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机译:具有反应性官能团的水性聚氨酯及其制备的纳米复合材料的制备方法
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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.
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