Synthesis and characterization of waterborne polyurethane adhesive from MDI and HDI

Abstract

A series of waterborne polyurethane adhesives (WPUAs) were prepared from diphenylmethane-4,4 0 -diisocyanate (MDI), 1,6-hexamethylene diisocyanate (HDI), poly(1,4-butanediol adipate) diol (PBA), 1,4-butanediol (BDO), and internal-emulsifying agents by the prepolymer mixing method. The viscosity, mechanical properties, thermal properties, and adhesion strength of the samples were measured. The structure-property relationship was discussed primarily. The results indicated that the MDI/HDI and PBA/BDO molar ratio influenced these properties. The WPUA exhibited excellent T-peel strength and mechanical properties at a suitable MDI/ HDI (or PBA/BDO) molar ratio. Moreover, higher MDI/ HDI (or PBA/BDO) molar ratio resulted in higher thermal stability.

Effects of TDI and FA‐703 on physico‐mechanical properties of polyurethane dispersion

“…The dispersion of polymers in water and properties of cast films are affected by the type and content of ionic centers and polyols as soft segment. [18][19][20][21][22][23][24][25] This article describes the preparation of (PUDs) from poly(oxytetramethylene) glycol (PTMG), triol (FA-703), dimethylol propionic acid (DMPA), isophorone diisocyanate (IPDI), and toluene diisocyanate (TDI). The influence of the different contents of FA-703 and TDI on the physical and mechanical properties of emulsion-cast films, contact angle, viscosity, and particle size distribution was studied.…”

Synthesis, characterization, and properties of acrylate‐modified tung‐oil waterborne insulation varnish

“…As shown in Figure 1(a), the strong characteristic absorption peak at 2275 cm 21 was assigned to the stretching vibrations of ANCO in HDI. 26 When HDI was blocked by MEKO at 80 C for 2 h, the intensity of ANCO was weakened because of the blocking reaction [ Figure 1 The deblocking temperature of the blocked HDI played an important role in film curing. DSC was conveniently used to Scheme 1.…”

Role of the interactions between carbonate groups on the phase separation and properties of waterborne polyurethane dispersions prepared with copolymers of polycarbonate diol

“…PUD consists in linear thermoplastic the ionic groups [2]. Recent studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] demonstrated that the ionic group content, solids content, segmented structure, molecular weight of the polyol, the type of chain extender and the hard/soft segments ratio determined the PUDs properties. However, there are few studies dealing with the influence of the composition of copolymers of polycarbonate diol on the properties of the polyurethanes [21][22][23][24][25] and, to the best of our knowledge, there are few publications dealing with polyurethane dispersions [22,26,27].…”