丙烯酸树脂改性的水性聚氨酯结构设计及表征

STRUCTURAL DESIGN AND CHARACTERIZATION OF ACRYLIC RESIN MODIFIED WATER BORNE POLYURETHANE

设计聚氨酯（ＰＵ） 、丙烯酸树脂（ ＰＡ）２ 种树脂的机械共混、化学共混即核－ 壳型聚合过程，及设计该２ 种树脂分子链之间形成的化学键，研究了用丙烯酸树脂改性的水性聚氨酯。分析乳胶粒大小及分布、胶膜材料红外光谱及ＤＳＣ 特征曲线表明：设计ＰＵ 分子链硬段与ＰＡ 分子链形成化学键，得到的材料中ＰＵＡ 及ＰＵ／ＰＡ 中ＰＵ 分子链硬段与ＰＡ 分子链具有较高的相容性和共混程度；核－ 壳型聚合得到的ＰＵＡ 及ＰＵＡ′材料ＰＵ 分子链与ＰＡ 分子链之间处于一定的微相分离状态；机械共混物ＰＵ／ＰＡ 中ＰＵ 分子链、ＰＡ 分子链之间的共混主要集中于ＰＵ 乳胶粒、ＰＡ 乳胶粒表层。

This article has proposed the design of mechanical blending and chemical blending(core-shell polymerization) of polyurethane(PU) and acrylic resins(PA),and the chemical bonding between the molecule chains of the above two resin blends, from which a acrylic resin modified water borne PU was developed The characteristics of emulsion particle size and distribution, IR spectrum and DSC of the blend have shown that the hard segment in PU and PA segment react from each other to form chemical bond showing high compatibility and blend degree in PUA or PU/PA; the PU segment and PA segment in PUA or PUA′ by core-shell emulsion polymerization shows slight phase separation; the blending between PU segment and PA segment for mechanical blend of PU/PA appears mainly on the surface of PU particles and PA particles