Study on Performance of Photosensitive Silicone Rubber Ink for UV-Assisted Direct Writing 3D Printing
A series of silicone rubber inks for UV-assisted direct writing 3D printing were prepared based on thiol-ene click reaction,and the effects of sulfhydryl in crosslinking agent and silica on the rheological properties,light transmission,and UV-Vis curing depth of photosensitive silicone rubber inks were analyzed by rotational rheometers,solid rheometers and UV-Vis spectrophotometers.The results show that the yield stress of silicone rubber ink increases with the increase of silica and sulfhydryl content,however,the light transmittance of silicone rubber ink decreases as the silica and sulfhydryl content increase.The me-chanical properties of the product are influenced by the combination of the sulfhydryl content of the crosslinking agent,the rein-forcing effect of silica,and the curing depth.When the sulfhydryl in the crosslinking agent is low,the mechanical strength of the product increases with the increase of silica.However,when the sulfhydryl in the crosslinking agent is high,the higher amount of silica will reduce the mechanical strength of the product.The content of sulfhydryl and silica can be adjusted to balance the vari-ous properties of the ink,there by ensuring good printability.The UV-assisted direct writing 3D printing can achieve the prepara-tion of non-collapsing and large-span structures that are difficult to achieve with general direct ink writing technology.
direct writing 3D printingsilicone rubberrheological propertylight transmissionUV curing depth
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