Wholesale Aliphatic Urethane Acrylate Supplier & Factory

Aromatic urethane acrylates (based on TDI or MDI) contain benzene ring linkages directly connected to the urethane bond. Under environmental UV absorption, these aromatic structures undergo photo-Fries rearrangement and oxidization, generating highly colored chromophores that turn coatings yellowish-brown and brittle. Aliphatic structures (based on IPDI, HDI, or H12MDI) lack these chromophores, guaranteeing absolute optical clarity, gloss retention, and weatherability throughout extended outdoor service life.

Higher functionality (4 to 6 double bonds per molecule) leads to a dense, tightly crosslinked three-dimensional network upon UV curing. This raises scratch resistance, chemical barrier properties, and pencil hardness, but simultaneously increases volumetric polymerization shrinkage, which can induce interfacial stress and reduce adhesion to smooth substrates like polycarbonate or untreated metal. Difunctional and trifunctional oligomers provide superior elongation, flexural flexibility, and lower shrinkage stress, making them ideal primers or flexible topcoats. Blending both types establishes optimal synergistic performance.

Yes. Ever Ray operates dedicated lab and pilot synthesis reactors that adjust diisocyanate structures, polyol chain lengths, branching degrees, and cut ratios using specific reactive monomers (such as TPGDA, DPGDA, TMPTA, or IBOA). We can precisely engineer the glass transition temperature (Tg) from as low as -30°C for hyper-flexible adhesives up to +85°C for abrasion-critical optical hardcoats.

Acrylate oligomers are stabilized against thermal polymerization using phenolic inhibitors (such as MEHQ) which require dissolved oxygen to function effectively. Resins must be stored in original, tightly sealed, opaque containers away from direct sunlight, UV sources, and heat radiators, ideally between 10°C and 30°C. Never blanket UV acrylate resins with inert gases such as nitrogen, as depleting oxygen can trigger spontaneous thermal radical polymerization and batch gelation.