Programmable 4D printing method with function of projecting with multiwavelength ultraviolet light

Abstract

The invention discloses a programmable 4D printing method with a function of projecting with multiwavelength ultraviolet light. The programmable 4D printing method comprises the following steps of 1,selecting a light-sensitive material which has curing performance and has selectivity to different wavelengths in an ultraviolet band according to the function design of a printed product; 2, selecting a light source containing required wavelengths and optical filters correspondingly penetrating through the wavelengths according to the characteristics of the selected light-sensitive material; 3, determining adopted cured wavelengths at different position points according to the function requirement of the printed product, completing the performance programming of different positions of the whole product, and writing a program in a DLP projecting module of a light curing system; and 4, curing the printed material layer by layer according to the written program, thereby printing the designed4D product which has a difference in performances of different positions. The programmable 4D printing method performs light curing at different position points on each layer of materials with ultraviolet light with different wavelengths, the working procedures of replacing spray nozzles, material pools and cleaning the surface of a sample are reduced, and therefore, the flow is simpler, and theprinting efficiency is higher.

Description

technical field [0001] The invention relates to the field of 4D printing of smart materials, in particular to a programmable 4D printing method utilizing multi-wavelength ultraviolet projection. Background technique [0002] Light-curing rapid prototyping technology is the earliest developed, most mature and widely used 3D printing technology. This technology uses photosensitive resin liquid as the raw material. The photosensitive properties of the resin make the material polymerize and solidify after being irradiated by light of a special band (mostly in the ultraviolet band). Photocuring technology generally controls the illuminated area through galvanometer scanning technology or mask plate technology, so that the resin can be polymerized and cured in the controllable illuminated area, and a three-dimensional solid model is generated after layer-by-layer curing and superposition. Due to the influence of material properties and other aspects, photocuring technology is mos...

AI Technical Summary

Problems solved by technology

At present, the 4D printing technology commonly used in the world is mainly based on the 3D printing technology and adopts the double nozzle or double material alternate curing method. For example, Landgraf proposed to use Aerosol jet printing (spray printing) 3D printing technology to manufacture DE materials in 2013. ,Since the silica gel used is two-component mixed curing, in order to prevent the two-component silica gel from curing in the nozzle and blocking the nozzle, the research group designed a dual-nozzle printing device, and the two components of the silica gel are printed in the form of spray through the two nozzles. , the two components are solidified after contact, so that the cumulative solidification point by point can realize the 3D printing and manufacturing of three-dimensional structure DE materials, but there are some disadvantages in the double nozzle technology, first of all, the printing speed is slow, the nozzle is easy to block, the maintenance is complicated, and the failure rate is high. The cost is high, followed by the need to use at least two nozzles resulting in poor positioning accuracy; for example, A.Creegrn and I.Anderson proposed to use dual-material UV-curing 3D printing technology to alternately print DE matrix materials and DE electrode materials in 2014 , UV curing 3D printing technology is to achieve three-dimensional solid printing by moving ultraviolet light beams on the surface of liquid resin materials and solidifying them point by point. The research group proposed to realize AB dual-material UV 3D printing technology by alternately curing two liquid resin materials A and B , this method needs to replace the material pool for each layer of printing, and the surface of the sample needs to be cleaned every time it is replaced to remove the last material remaining on the surface. The process is cumbersome and the printing speed is slow.

[0005] To sum up, the current 4D printing technology is mainly based on light-curing 3D printing and adopts dual-nozzle technology or dual-material alternate curing technology. They all have problems such as slow printing speed, cumbersome process, complicated maintenance and high cost, which seriously restrict 4D printing. The development of printing technology

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