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In the modern printing industry, PU resin for ink (polyurethane resin) is highly favored due to its unique properties. This polymer, with -NHCOO- as its main structural unit, not only endows the ink with excellent physical and chemical properties but also greatly enriches the application scenarios of the ink. Below, we will explore in depth the various uses of PU resin for ink.
PU resin for ink, with its excellent oil resistance, toughness, wear resistance, aging resistance, and adhesion, significantly enhances the overall performance of the ink. The addition of PU resin improves the wetting of pigments, making the ink film firm and wear-resistant, thereby extending the lifespan and improving the quality of printed products.
PU resin for ink is not only suitable for gravure printing inks and flexographic inks but also widely used in the manufacture of water-based inks. Its unique molecular structure allows the ink to form a uniform and firm ink film on various substrates, meeting the needs of different printing processes.
With the increase in environmental awareness, PU resin for ink development has fully considered environmental requirements. Inks made with alcohol-ester solvents, which are free from benzene and ketone, not only reduce environmental pollution during production but also improve the environmental and food safety properties of the ink.
Anti-yellowing properties: PU resin for ink made from aliphatic polyester and aliphatic isocyanates exhibits excellent optical stability and anti-yellowing properties, allowing printed products to maintain vibrant colors even after long-term storage.
Excellent adhesion: PU resin's polar groups in the molecular chain form hydrogen bonds with the surface of various polar substrates, enhancing the bonding strength between the ink and the substrate, providing printed products with good adhesion.
Good pigment affinity and wetting: PU resin for ink has good dispersing and wetting properties for pigments, improving the wetting of pigments during printing and enhancing the quality of printed products.
Excellent film-forming properties: PU resin for ink, by introducing urea into the molecular structure, improves the cohesive strength of the resin itself and the paint film, giving printed products better scratch and wear resistance.
Wide solvent compatibility: PU resin for ink can be widely dissolved in organic solvents, including ketones, esters, benzenes, and other non-alcoholic organic solvents, as well as alcoholic solvents. This allows the ink to have better stability and fluidity during production.
In summary, PU resin for ink, with its unique properties and wide range of applications, plays a crucial role in the printing industry. With continuous technological advancements and increasing environmental requirements, PU resin for ink will continue to maintain its important position in the printing industry.
