To select the suitable polyurethane resin for gravure lamination ink, the following several key factors need to be considered: Printing substrate: Determine the type of substrate on which the ink will be applied, such as paper, plastic film, etc. Different substrates may require polyurethane resin with specific properties. Adhesion: Ensure that the polyurethane resin can provide good adhesion on t...
On the impact that water has on waterborne polyurethane, we can delve into it from two perspectives. Firstly, water can penetrate between the molecules of waterborne polyurethane, resin and this effect is similar to that of a plasticizer. In this process, water undergoes hydrogen bonding interactions with the polar carbamate groups in the polyurethane molecules, resulting in a significant reductio...
From a chemical perspective, waterborne polyurethane resin is essentially a-viscosity liquid composed of uniformly dispersed gel particles in water. During the of chain growth, the viscosity of the emulsion generally maintains a state of equilibrium, and its variation mainly comes from the increase in molecular weight of the particles themselves. In practical applications, when the temperature for...
There are many types of ink, but basically they are all composed of four types of substances: binder, solvent, various auxiliaries, and catalysts. In recent years, with the development of the economy, the call for environmental protection has become increasingly high, and the printing industry has put forward new requirements for offset ink in terms of non-toxicity and pollution-free. Solvent-base...
Polyester-based and polyether-based polyurethane (PU) resin are two commonly used types of waterborne PU resins. Here are the advantages and disadvantages of each type: Polyester-based waterborne PU resin: Advantages: Excellent mechanical properties: Polyester-based polyurethane resin offer good tensile strength, elongation, and impact resistance, making them suitable for applications that require...
Polyurethane binder is a type of polymer that plays a crucial role in gravure printing inks. Gravure printing, also known as rotogravure or simply gravure, is a high-speed printing process that uses engraved cylinders to transfer ink onto a substrate, such as paper, film, or foil. In this process, the polyurethane binder serves several important functions: 1: Adhesion: The primary function of...
Performance indicators of water-based polyurethane resin-adhesion Water-based polyurethane resin has a relatively large number of polar groups, such as hydrogen bonds, pulse bonds, ionic bonds, etc. There are Coulomb force, van der Waals attraction and hydrogen bonding between it and the surface of the substrate. Some polyurethane adhesives are end-capped with NCO, which can react with surface H2O...
Water-based PU resin is a polyurethane system that uses water instead of organic solvents as the dispersion medium. It is a new type of environmentally friendly polymer material.Because of its excellent environmental protection, excellent mechanical properties, and good compatibility with other water-based resins,water-based PU resin is widely used in adhesives, coatings, and coating products.What...
The roles of water-based polyurethane resin in ink include enhancing adhesion, improving yellowing resistance, and adjusting viscosity, among others. Next, I will explore in detail the various functions and application effects of water-based polyurethane resin in ink: Enhancing Adhesion Description: According to search results, the molecular structure of water-based polyurethane resin contains str...
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