Preparation method of polyvinylidene-fluoride-based 3D printed piezoelectric part with porous structure

Abstract

The invention provides a preparation method of a polyvinylidene-fluoride-based 3D printed piezoelectric part with a porous structure. The method comprises the following steps that ionic salt tetraphenyl phosphorus chloride is used as a modifier and is internally mixed, melted and blended with a PVDF polymer base material, and the piezoelectric part with the porous structure is prepared from the obtained PVDF-based composite material through a fused deposition modeling 3D printing technology. According to the method, setting of the internal filling rate, specification of the nozzle diameter and limitation of printing parameters during fused deposition modeling 3D printing are determined on the basis of experimental evidence, so that the prepared piezoelectric part has the three-dimensional porous structure characteristic; and the size of the holes, the distance between the adjacent holes and the arrangement mode of the holes are subjected to standard quantification through the limiting conditions, so that the piezoelectric part with the porous structure, of which the comprehensive performance or piezoelectric performance is obviously superior to that of the prior art, is obtained.

Description

technical field [0001] The invention belongs to the technical field of 3D printing piezoelectric parts, and in particular relates to a method for preparing a polyvinylidene fluoride-based 3D printing piezoelectric part with a porous structure. Background technique [0002] Piezoelectric materials, as new intelligent materials that can realize mutual conversion of mechanical energy and electrical energy, can be used in energy harvesting, sensing, driving and other fields. They are key materials and strong support for the realization of high-tech breakthroughs and developments such as the Internet of Things and 5G communications. At present, the most widely used piezoelectric materials in industrial production and practical applications are piezoelectric ceramic materials such as lead zirconate titanate (PZT), barium titanate (BaTiO 3 ), etc., have excellent piezoelectric and dielectric constants. However, piezoelectric ceramics have the disadvantages of difficult processing,...

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Problems solved by technology

However, in Example 4 of the prior patent application, when CTAB (cetyltrimethylammonium bromide) was used as the modifying agent, although the relative content of β crystals in its modified PVDF product reached 97.0%, CTAB was added When the amount is low (3wt%), the crystallinity of the system will still decrease greatly (decrease 11.0%), thus affecting the mechanical properties and piezoelectric properties of piezoelectric products

[0006] However, the above-mentioned post-processing method and the additional process technology recorded in the prior art are often relatively complicated, and under the effect of industrialization amplification, the overall cost will be greatly increased. If the 3D printed product is directly used as an industrial product without post-processing, it must Adopt non-ionic liquid especially ionic salt as modifying agent, but the β crystal content of preparation gained product is usually difficult to exceed 90% (when the addition is 5wt% ionic salt) except the ionic salt selection of CTAB ), and further increasing the amount of ionic salt added, although the β crystal content will further increase, but at the same time it will greatly increase the dielectric loss of the material, so it has no practical value

Therefore, although the process production method without additional process technology has the characteristics of simple operation and low cost, it is difficult to achieve the same effect as the technical solution including post-treatment process or additional process technology in terms of piezoelectric performance. and height, which greatly affects the transformation of material products into industrialized implementation

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