Multifunctional Adhesive Material Inspired by Persimmon Tannin
—Compatible with Metallic, Organic and Inorganic Materials, the Use of This Adhesive May Greatly Facilitate Miniaturization and an Increase in the Performance of Electronic Devices—
National Institute for Materials Science (NIMS)
NOF Corporation
Inspired by persimmon tannin—a naturally occurring dye traditionally used in Japan—NIMS and NOF Corporation have developed a polymer capable of bonding a wide range of materials, including metallic, ceramic and organic materials.
Abstract
- Inspired by persimmon tannin—a naturally occurring dye traditionally used in Japan—NIMS and NOF Corporation have developed a polymer capable of bonding a wide range of materials, including metallic, ceramic and organic materials. This adhesive also has an ability to incorporate additional functions, such as anticorrosion coating. This versatile adhesive is anticipated to be very useful in many industrial fields, such as the infrastructure, semiconductor and automobile sectors.
- Adhesive and coating materials are essential tools in industrial manufacturing as they are needed to protect material surfaces, enhance the aesthetic quality of products and add new functions to them. The bonding strength of adhesives—their primary function—is influenced by the compatibility of an adhesive with a bonding surface of a substrate. Because different adhesives have different bonding strengths depending on the types of substrates to which they are applied (e.g., metallic, organic and inorganic materials), manufacturers need to select an optimum adhesive from many options for each type of substrate they process, making manufacturing processes time-consuming and costly.
- A NIMS-NOF Corporation joint research team developed a highly versatile adhesive material using persimmon tannin as an inspiration. Persimmon tannin has long been used in Japan as a naturally occurring waterproofing dye. It has been used to waterproof various materials, including fishing nets/lines, paper fans and umbrella. Using polyphenol—an adhesive component of persimmon tannin—the team succeeded in developing a polymeric material highly adhesive to the surfaces of a variety of substrates, including metallic, organic and inorganic materials. This versatile material was also found to have other useful functions, such as making metals resistant to water and corrosion and serving as a dispersing agent of photoresist particles for silicon semiconductor manufacturing, inorganic particles for multilayer ceramic capacitor, and metallic particles for conductive inks.
- Product samples of this material are now available from NOF Corporation. We will promote the use of this material in various industrial fields with high demand for adhesive technologies, such as the display, semiconductor, automobile and infrastructure repair sectors.
- This project was carried out jointly by Masanobu Naito (Leader of the Data-driven Polymer Design Group, Research and Services Division of Materials Data and Integrated System, NIMS) and NOF Corporation. This research will be presented at the two online events: “Chemical Material Japan 2020” to be held from October 19 to November 18, 2020 and “NIMS Week 2020” to be held on November 27, 2020.
Figure 1.Monomer Structure of Novel Adhesive Coating Materials with Polyphenol Skeleton mimicing Persimmon Tannin
