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In the printing industry, the quality of ink directly affects the appearance and performance of printed products. And ink binder, as an indispensable part of the ink, its performance and quality have a crucial impact on the overall performance of the ink. As one of the leading industrial laminating adhesive manufacturers in the domestic high-performance composite polyurethane adhesive industry, we are fully aware of the importance of ink binder and are committed to providing high-quality ink binder products to our customers.
This type of PU resin for ink primarily functions to firmly adhere pigments, dyes, and other solid particles to the substrate, forming a uniform printing layer. It not only needs to have good adhesion performance but also good compatibility with pigments, dyes, and other solid particles to ensure that the prints are vivid and vibrant.
Excellent Yellowing Resistance
Ink binder use advanced polyurethane resin technology, which provides excellent yellowing resistance. Even under long-term use and exposure to light, printed products can maintain vivid colors and resist fading.
Excellent Adhesion to Film Substrates
Ink binder contain various polar groups in the molecular chain segments, which can form hydrogen bonds with multiple polar substrates such as PET and PA, achieving firm adhesion. This ensures that printed products can maintain stable printing effects even under complex environmental conditions.
Good Affinity and Wetting with Pigments
Ink binder use special preparation processes and introduce polar groups such as urethanes, granting them excellent dispersing and wetting properties with pigments. This helps to achieve uniform distribution of pigments in the ink, improving the color uniformity and saturation of printed products.
Good Resin Compatibility
These laminating adhesives are highly compatible with various resins like aldehyde-ketone resin and chlorinated vinyl chloride resin. This provides users with more formula options and allows them to adjust the ink's performance according to actual needs, meeting the requirements of different printing processes.
Excellent Film-Forming Properties
Ink binder, based on traditional polyurethane resin, incorporate urethane groups, significantly enhancing the cohesive strength and film-forming ability of the resin. This allows printed products to form a strong and durable film layer after drying, improving abrasion resistance and weather resistance of the prints.
Good Solvent Release
Ink binder have good solvent release properties, enabling rapid solvent release during the printing process for quick ink drying. This helps improve printing efficiency and reduce energy consumption.
| Substrate Type | Surface Characteristics | Recommended Ink Binder Types | Key Advantages | Notes & Key Applications |
|---|---|---|---|---|
| BOPP | Low surface energy, non-polar | Nitrocellulose + PU Resin blend | Fast drying, good adhesion, cost-effective | Suitable for surface printing and laminating inks; alcohol-soluble PU binder recommended |
| PET | Moderate polarity, heat-resistant | Aliphatic PU Resin or PU/Acrylic hybrid | Excellent heat resistance, high peel strength | Preferred for high-end flexible packaging inks, especially retort pouches |
| PE (LDPE/HDPE) | Very low surface energy, high flexibility | High-flexibility PU Resin or CPP modified system | Superior flexibility, crack resistance | Requires adhesion promoters to enhance ink binder adhesion |
| NY (Nylon) | High polarity, moisture-absorbing | Aliphatic PU Resin dominant | Strong adhesion, good puncture resistance | Moisture protection needed; ideal for high-barrier flexible packaging inks |
| Paper/Paperboard | Porous, higher surface energy | Water-based Acrylic Emulsion or PU-modified Acrylic | Good printability, adjustable gloss, abrasion resistance | Prevent excessive ink penetration; suitable for paper-plastic composite packaging |
What are the differences between polyurethane (PU) binders and nitrocellulose (NC) binders?
PU binders offer superior flexibility, heat resistance, and adhesion, making them suitable for retort packaging and laminating inks. NC binders dry faster, have higher gloss, and are less expensive, making them more suitable for high-speed surface printing, but they have poorer heat resistance.
What are the special requirements for binders in laminating inks?
Laminating inks require binders with extremely strong adhesion, high temperature resistance (above 121℃), and chemical resistance. Aliphatic PU resins or PU-modified systems are typically preferred to ensure adequate peel strength after lamination.
What are the differences between binders in water-based inks and solvent-based inks?
Water-based inks primarily use acrylic emulsions or PU dispersions; solvent-based inks commonly use PU resins, nitrocellulose, or polyamide resins. Solvent-based inks generally offer better adhesion and resistance, but water-based inks are more environmentally friendly.
What to do if the ink binder has poor adhesion?
The following methods can be used to improve the surface tension: ① Perform corona treatment on the substrate to increase surface tension; ② Add a special adhesion promoter; ③ Replace with a more suitable binder (such as changing from NC to PU system); ④ Adjust the proportion of binder in the ink formulation.
Ink binder, with their excellent performance and wide application fields, have become the preferred brand in the printing industry. In future development, we will continue to focus on technological innovation and product upgrades to provide customers with een higher qualityink adhesive products and solutions.
