Functional ink suitable for 3D printing and preparation method thereof

#This application is the national phase entry of International Application No. PCT/CN2019/129799, filed on Dec. 30, 2019, which is based upon and claims priority to Chinese Patent Application No. 201910047850.X, filed on Jan. 18, 2019, the entire contents of which are incorporated herein by reference.

#The present invention relates to the technical field of three-dimensional (3D) printing, and in particular, to a functional ink suitable for 3D printing and a preparation method thereof.

#3D printing technology, also known as additive manufacturing technology, is a way of manufacturing layer-by-layer by adding materials based on 3D model data, which is completely opposite to the traditional material processing method. An advantage of 3D printing is that one is able to construct complex structures having arbitrary shapes, and realize the rapid and efficient production of three-dimensional structure. Due to its unique characteristics of dimension reduction and rapid layer-by-layer processing, 3D printing provides unlimited possibilities for the next generation of manufacturing technology. Additive manufacturing is the development direction supported by the 13th Five-Year Plan in China.

#FIGS. 1A-1F are diagrams demonstrating the self-healing ability for the restoration of mechanical properties and electrical conductivity of a functional ink; where, FIG. 1A is a digital image of a sample subjected to cutting; FIG. 1B is a digital image of it after self-healing; FIG. 1C is is a photo showing functional ink stretching after self-healing to illustrate the robustness of the healed interface; FIG. 1D is a digital image demonstrating the electrical conductivity of the functional ink before the cutting; FIG. 1E is a digital image showing the interface created after cutting reflected by the LED light turned off; and FIG. 1F demonstrates the healed interface and restored electrical conductivity of the functional ink after the self-healing;

#FIGS. 2A-2H are images captured from an optical microscope showing the dynamic evolution of the healing interface of the incision made on the functional ink; where, FIG. 2A is an image showing the original sample before the cutting; FIG. 2B is an image showing the incision after the cutting; FIG. 2C shows the sample under healing for 0 s; FIG. 2D shows the sample under-healing for 2 s; FIG. 2E shows the sample under healing for 4 s; FIG. 2F shows the sample under healing for 6 s; FIG. 2G shows the sample under healing for 10 s; and FIG. 2H shows the sample under healing for 20 s;

#FIG. 3 is a diagram showing cyclic stability test results of a 3D printed supercapacitor prepared in embodiment 1;

#The specific embodiments of the present invention are described below to facilitate those skilled in the art to understand the present invention. However, it should be clear that the present invention is not limited to the scope of specific embodiments. For those ordinarily skilled in the art, these modifications are obvious as long as various modifications are made within the spirit and scope of the present invention as defined and determined by claims, and all inventions and creations utilizing the concepts of the present invention shall fall into the protection scope.

#A functional ink suitable for 3D printing includes the following components in parts by weight:

#0.6 parts of tannic acid, 1 part of graphene, 0.2 parts of polymaleic acid, 0.2 parts of ferric chloride, and 30 parts of deionized water.