Process for making biomimetic composite functional structure by diatomite acid etching

Abstract

The invention provides a process for making a biomimetic composite functional structure by using diatomite acid etching, including diatomite deep purification treatment, diatomite hydrofluoric acid pre-etching at room temperature, diatomite hydrofluoric acid ultrasonic heating acid Etching, diatomaceous earth hydrofluoric acid vacuum pressureless hot acid etching, polyvinyl alcohol atomization infiltration to strengthen the structure and other processes. Compared with the existing technology, the application of polyvinyl alcohol atomization and infiltration process plays a role in strengthening the bonding of diatomite particles that are partially bonded or in a discrete state after acid etching, which is beneficial to the bionic composite functional structure system The improvement of the overall mechanical strength of the finished product further promotes its practical effect and expected life; the external pressure does not always act on the whole process of the acid etching reaction, which avoids the stress damage to the bonding process between the diatom shells in the later stage of the reaction.

Description

technical field [0001] The invention relates to a process for making a biomimetic composite functional structure by using diatomite acid etching forming reaction to realistically replicate the topography of biological surfaces, more particularly, a biomimetic composite structure made of diatomite acid etching. The craft of functional structures. Background technique [0002] Many organisms have gradually formed biological complex structures with unique structural and functional properties during the long-term evolution process. For example, in addition to the micron-scale papillae-like biological non-smooth morphology on the surface of the lotus leaf, it also has a nano-scale biological wax secretion structure. The desorption function is called the "lotus leaf effect". In addition to the micron-scale groove-like biological non-smooth morphology of the shark's epidermis, there is also a nano-scale drag-reducing fluid secretion structure under its scales. The coupling effect ...

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Problems solved by technology

However, the diatomite acid etching process provided by the above-mentioned patent has the following disadvantages: (1) the required reaction temperature is relatively high, mostly above 400°C; The most critical bonding process between diatom shells in the later stage causes stress damage; (3) lack of the necessary pre-etching process of diatomite at room temperature and low concentration, and the amorphous silica in diatomite cannot achieve a good bonding state; (4) After acid etching, the bonding between some diatomite particles is not complete, and some diatomite particles are in a discrete state, resulting in low overall mechanical strength of the finished product, which seriously restricts its practical effect and expected life

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