A flat-press manufacturing method of biomimetic adhesive structure based on micro-through-hole nickel-based mold

Abstract

The invention discloses a flat pressing manufacturing method of a bionic adhesion structure based on a nickel-based mold with micro-through holes. The steps include: preparing a nickel-based mold with an array of micro-through holes; placing the nickel-based mold on an elastic pad in a magnetic clamping system; uniformly coating a liquid prepolymer on the backing, and coating the backing with One side of the liquid prepolymer is placed on the nickel-based mold; the cavity is divided into upper and lower chambers by a sealed diaphragm, and the uniform pressure on the backing layer is realized by vacuuming the lower chamber and inflating the upper chamber, thereby achieving different viscosity prepolymers. Full filling of the polymer; after filling, curing and demoulding, the bionic adhesive material can be obtained. The invention contributes to the realization of an integrated molding process with a large depth-to-diameter ratio and an enlarged terminal structure; the combination of the magnetically induced mold clamping system and the electrochemical modification technology of the nickel-based mold realizes a complete microstructural appearance of the bionic adhesive material Azimuth controllable adjustment. The invention helps to improve the universality of micro-nano imprinting manufacturing technology to 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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