Method for regulating surface wettability of 3D printing piece made of PA2200 material by laser irradiation

Abstract

The invention discloses a method for regulating surface wettability of a 3D printing piece made of a PA2200 material by laser irradiation, and belongs to the field of laser processing, 3D printing technologies and medical application. A laser irradiation method has the advantages that the surface of a molded piece can be accurately processed, the processing area and depth are controlled, pollutionis avoided due to non-contact, and impurity ions cannot be introduced. The method is implemented by means of the following device: a laser, a compound eye beam homogenizing lens, a lens and a sampletable are placed in sequence along the laser transmission direction of the laser. The 3D printing piece is prepared from the PA2200 material, an optical path is designed by adopting KrF excimer laserof which the wavelength is 248nm, so as to obtain a laser irradiation light spot area 1 to 2.7cm<2>, the single pulse energy density of the laser is set as 37 to 259mJ / cm<2>, the frequency is 2 to 5Hz, the pulse number is 200 to 500, and the 3D printing piece made of the PA2200 material is irradiated. After laser irradiation, the surface contact angle of the printing piece is changed from 120 degrees to 70 degrees, hydrophily is changed from hydrophobicity, and the surface wettability of the 3D printing piece made of the PA2200 material can be effectively and rapidly regulated.

Description

technical field [0001] The invention relates to the fields of laser processing, 3D printing technology and medical applications, and in particular designs a method for regulating the surface wettability of 3D printed parts of PA2200 material by laser irradiation. Background technique [0002] PA2200 is a polymer material, composed of pure PA12, white in color, with good mechanical properties and biocompatibility. At present, PA2200 materials are used in laser selective sintering (SLS) 3D printing technology. PA2200 printed parts based on this technology have a wide range of applications in the medical field, including medical devices: biological scaffolds, sutures, syringes, dialysis equipment components and Implants: balloon catheters, vascular grafts, hard tissue implants, etc. Selective laser sintering (SLS) is a powder-spreading 3D printing layered forming technology. It has the characteristics of high manufacturing precision, fast printing speed, and the ability to cus...

AI Technical Summary

Problems solved by technology

The plasma method can effectively regulate the surface wettability of PA-based moldings, but it affects the surface functionalization of moldings

[0005] 2. Surface coating modification method: use physical methods to prepare a cross-linked hydrophilic coating on the surface of PA-type material moldings, which can effectively control the surface wettability of PA-type material moldings, but the coating is easy to fall off

[0006] 3. The method of introducing functional groups: introducing specific functional groups for the amide bonds in PA materials to control the surface wettability of molded parts, which can effectively control the surface wettability of PA materials molded parts, but it pollutes the surface of molded parts , and the change of the wettability of the surface of the molded part cannot last for a long time

[0007] 4. Laser irradiation method: In recent years, various lasers have been used to irradiate the surface of PA-type molded parts, which can effectively control the surface wettability of PA-type material molded parts. Compared with other methods, laser irradiation method has the advantages of It can accurately treat the surface of molded parts, control the processing area and depth, non-contact, pollution-free, and not introduce impurity ions, etc., but there is no report on the surface wettability of 3D printed molded parts controlled by laser irradiation.

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