Flat pressing manufacturing method of bionic adhesion structure based on micro-via nickel-based mold

Abstract

The invention discloses a flat pressing manufacturing method of a bionic adhesion structure based on a micro-via nickel-based mold. The method includes the steps of: preparing a nickel-based mold withan array of micro-vias; placing the nickel-based mold on an elastic liner in a magnetic assembly system; uniformly coating a backing with liquid prepolymer, and placing the side, coated with the liquid prepolymer, of the backing on the nickel-based mold; dividing a cavity into an upper cavity and a lower cavity by a sealing diaphragm, and uniformly pressing a backing layer by vacuumizing the lower cavity and inflating the upper cavity so as to achieve full filling of prepolymers with different viscosities; after completing filling, conducting curing and demolding, and obtaining the bionic adhesion material. The method contributes to the realization of an integrated molding process of a structure with a large depth-to-diameter ratio and an enlarged end; and the magnetic force-induced assembly system is combined with an electrochemical modification technology of the nickel-based mold to realize the omnidirectional controllable adjustment of the microstructure morphology of the bionic adhesive material. The method helps to improve the universality of the micro-nano imprint manufacturing technology for complex structures.

Description

technical field [0001] The invention relates to the field of micro-nano manufacturing, in particular to a flat-press manufacturing method of a bionic adhesive structure based on a nickel-based mold with micro-through holes. Background technique [0002] In nature, many organisms have demonstrated the ability to attach to the whole space in their living environment, from creepers in the plant kingdom to viruses in non-cellular life forms; from octopuses and mussels in the ocean to flies, spiders and geckos on land Wait. From the morphology of the terminal units of their adhesion system, it can be found intuitively that "terminal expansion" is the main structural feature of this type of biological functional unit. Many organisms with the ability to adhere to the whole space, their adhesion functional units have the structural characteristics of terminal expansion, showing excellent adhesion performance. Broad application prospects. [0003] In the past 20 years, scholars at...

AI Technical Summary

Problems solved by technology

And the metal mold group holes (hole density > 10,000 / cm 2 ) The difficulty coefficient of processing and control is high, and the physical behavior of the interface in the molding process is complex, which restricts the smooth progress of its scale

[0005] In 2015, Germany's Gottlieb Binder GmbH, relying on the technology of Professor Gorb's team at Kiel University, proposed a bionic adhesive structure rolling manufacturing technology with enlarged ends (US20150010732A1), and proposed the application of through-hole flexible templates in the rolling process. Compared with Flat pressing process, due to the clamping force of the rollers in the rolling process, it is easy to achieve end face sealing between the through-hole template and the surface of the roller. Structural injection molding and demoulding bring many difficulties, which restrict the molding of complex morphology microstructures

However, for the mushroom-shaped biomimetic adhesive structure with enlarged ends, due to the complexity of the metal mold manufacturing and the physical behavior of the interface during the molding process, the smooth progress of its scale is restricted.

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