Laser welding of polymers using unsymmetrical squaraine dyes,Journal of Polymer Science Part A: Polymer Chemistry

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Laser welding of polymers using unsymmetrical squaraine dyes
Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2018-09-28 , DOI: 10.1002/pola.29196
Helle Østergren Bak ₁ , Bjarne Enrico Nielsen ₁ , Anne Jeppesen ₁ , Theis Brock‐Nannestad ₁ , Christian Benedikt Orea Nielsen ₁ , Michael Pittelkow ₁

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Transmission laser welding of plastic is typically achieved by incorporating a laser absorbing dye into one of the two pieces of plastic one wishes to weld together and mediating the welding process using a laser emitting light at a suitable wavelength. Desirable properties of laser absorbing dyes include: (1) the dye is colorless in the visible region but absorbs strongly in the region at the wavelength where the laser emits, (2) the dye has a good conversion of the energy from the laser to heat, (3) the dye is stable enough to be incorporated into the molten plastic, (4) the dye is soluble in the plastic of choice to give an even distribution in the plastic, and (5) the dye is nontoxic. Here, we explore an alternative approach to achieve laser welding of colorless plastics using a laser dye that is colored, but that can be bleached after the welding process. Nonsymmetrical squaraine dyes were prepared by condensation of squaric acid and two equivalents of various 3,5‐dimethoxy‐N,N‐dialkylanilines. After the incorporation into polyethylene and laser welding, the plastic was bleached either by heat treatment or by irradiation with a high pressure Xe‐lamp giving colorless polyethylene. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 2245–2254

中文翻译：

使用不对称方酸染料对聚合物进行激光焊接

塑料的透射激光焊接通常通过将激光吸收染料掺入希望焊接在一起的两块塑料之一中并使用发射适当波长的光的激光来介导焊接过程来实现。激光吸收染料的理想特性包括：（1）染料在可见光区域是无色的，但在激光发射波长处的区域中吸收很强；（2）染料具有从激光到热的良好能量转换。，（3）染料足够稳定，可以掺入熔融的塑料中；（4）染料可溶于所选的塑料中，从而在塑料中均匀分布；（5）染料是无毒的。在这里，我们探索了一种替代方法，该方法可以使用有色的激光染料实现无色塑料的激光焊接，但是可以在焊接过程后漂白。通过将方酸与两当量的各种3,5-二甲氧基N，N-二烷基苯胺。掺入聚乙烯并进行激光焊接后，通过热处理或高压Xe灯辐照将塑料漂白，得到无色聚乙烯。©2018 Wiley Periodicals，Inc.J.Polym。科学，A部分：Polym。化学 2018，56，2245年至2254年

更新日期：2018-09-28

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