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Light intensity influence on critical energy and penetration depth for vat photopolymerization technology

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Abstract

Photopolymer testing for vat photopolymerization additive manufacturing was performed and two key parameters were measured: critical energy of photopolymerization initiation (Ec) and penetration depth (Dp). Evaluation of these parameters was carried out with different wavelengths (385 nm and 405 nm). Dependences of the chemical composition on the behavior of Ec and Dp were evaluated. Working curves were obtained for transparent and pigmented photopolymers and the influence of light intensity on Ec and Dp was studied. The comparison of accuracy of the studied resins was done based on working curves and Dp. The increase of light intensity from 1 up to 15 mW/cm2 at 385 nm resulted in increase of Ec from 1.1 up to 4.24 mJ/cm2 and increase of cure depth from 43.7 up to 70.2 μm for pigmented material. For clear material the rise of light intensity from 1 up to 15 mW/cm2 at 385 nm resulted in increase of Ec from 1.94 up to 4.61 mJ/cm2 and increase of cure depth from 87.7 up to 131.1 μm. Moreover, for the first time it was showed that the light intensity influences on Ec, Dp and printing accuracy. This information can be used for the determination of correct printing conditions for additive manufacturing processes.

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Acknowledgements

The authors would like to thank to Dr. Nikolay Kosyrev for the ability to measure working curves on Asiga Pico II 3D-printer.

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Authors and Affiliations

  1. D.I. Mendeleyev University of Chemical Technology of Russia, 9 Miusskaya Sq., 125047, Moscow, Russia

    Yu. Rudenko & N. Fedyakova

  2. HARZ Labs DOO, Aleksandra Aca Prijića 16A, 81101, Podgorica, Montenegro

    A. Lozovaya, L. Asanova & P. Chapala

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  1. Yu. Rudenko
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  2. A. Lozovaya
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  3. L. Asanova
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  4. N. Fedyakova
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Correspondence to P. Chapala.

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Rudenko, Y., Lozovaya, A., Asanova, L. et al. Light intensity influence on critical energy and penetration depth for vat photopolymerization technology. Prog Addit Manuf 9, 553–561 (2024). https://doi.org/10.1007/s40964-023-00474-z

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