1.Excellent resistance to yellowing
The
Polyurethane Resin used in ink is mainly synthesized from aliphatic polyesters and aliphatic isocyanates during the preparation process. Compared with aromatic polyurethanes, it has excellent optical stability and the formed film has excellent resistance to yellowing.
2. For the excellent adhesion of the film substrate
The molecular chain segments of the polyurethane resin used for ink contain polar groups such as amine carbamate, urea carbamate, ester bonds, and ether bonds. These polar groups on the surface of various polar substrates like PET and PA form hydrogen bonds, thereby forming a certain connection strength joint. After the polyurethane resin is made into ink, when printed on the surface of polar plastic substrates, it has excellent adhesion strength.
3. Has good affinity and wettability with pigments/ dyes
The polyurethane resin used for ink is generally prepared from polyester or polyether polyols, cycloaliphatic diisocyanates, and diamine/dialcohol chain extenders. Its molecular weight is approximately tens of thousands. Due to the introduction of urea bonds in the
Pu Resin, a polyurethane-urea resin (PUU) is formed, which has excellent dispersion and wetting properties for pigments.
4. Excellent resin compatibility
The polyurethane resin used in the ink has good compatibility with aldehyde-ketone resin, acetic acid resin, etc. Users can appropriately add it according to actual conditions and their own process formula to improve the comprehensive performance of the ink.
5. Excellent film-forming performance
The polyurethane resin of the ink is structurally different from that used in other fields. The traditional polyurethane is mainly formed by the reaction of polyester polyol/ether polyol with isocyanate to produce end-hydroxyl polyurethane resin. The polar groups in the molecular structure are mainly aminoformic acid, and the intramolecular cohesion is insufficient to meet the film-forming performance requirements of the
Ink Resin. Therefore, the polyurethane resin for ink is introduced with urea groups on the basis of the traditional polyurethane, which greatly improves the internal cohesion strength and film-forming property of the resin.
