Physical Properties of Coating Films Mixed Urushi/NAD

Abstract

Two types NAD (Non Aqueous Dispersion) were selected to improve and fill for Urushi, and physical properties of coating films mixed Urushi/NAD were studied.
Main results were as follows,
(1) Both NAD-A and NAD-C had a good mixing state. Separation, after thickening and gelation were not recognized during storage.
(2) NAD-A showed a similar tendency to mix oils and had behavior like as plasticizer.
(3) NAD-C was able to expect to improve gloss and transparency of Urushi film, and to be good filler as its disadvantage was less than oils and NAD-A although coating film mixed it had little a fall of viscoelasticity (high temperature E' and Tg).
From the results presented above, it is considered that coating film mixed Urushi/NAD is able to satisfy the request for its ability by preparing of NAD, that is, devising design of stabilizer or stabilizer/dispersion polymer ratio or Tg of dispersion polymer.