Synthesis and Characterization of

Two-component Waterborne Polyurethane

Adhesive

ZHENG Yan-qing 1*, ZOU You-si 2

(1. Department of Chemistry and Chemical Engineering, College of Minjiang, Fuzhou 350108, China; 2. College of Materials, Xiamen University, Xiamen 361005,China)

Abstract: Polyol component of two-component waterborne polyurethane (WPU) was synthesized as component A starting from polyeaster diol, TDI, DMPA, BDO and TMP. Screening from numerous alcohol compounds such as glycols (e.g., ethylene glycol, propylene glycol, butanediol, diethylene glycol, etc.), ternary alcohol (glycerin), quaternary alcohol (pentaerythritol), polyethylene glycol (molecular weight from 200 to 2000), polypropylene glycol (molecular weight from 300 to 2000) in respect of solubility, reactivity and industrial cost, PEG-800 and HDI trimer were selected as starting materials to synthesize hydrophilic isocyanate curing agent for component B. Two-component WPU adhesive was prepared by mixing component A and B. Characterized with FT-IR, 1H-NMR and determined with viscosity, water absorption, centrifugal stability and adhesive strength, various factors effecting the formation and properties of components A and B were studied. Excellent appearance, stability and adhesive strength were shown for polyol components in the presence of 6% DMPA, 4?O and 3% TMP. Using PEG as the hydrophilic component with a content of 11% or more, the prepared polyisocyanate curing agent showed good water dispersibility.

Key words: waterborne polyurethane; adhesive; polyol component; curing agent; adhesive strength