Polyurethane acrylate-based titanium dioxide was used to prepare blue light-curable inks as both a white pigment to replace the original white pigment and as an oligomer. The polyurethane acrylate-based titanium dioxide was fabricated using a two-step method. In the first step, the titanium dioxide was grafted with γ-aminopropyltriethoxy silane, and the grafting process was studied. Second, amino-modified titanium dioxide was used to prepare polyurethane acrylate-based titanium dioxide, which was then used to configure the blue light-curable polyurethane acrylate-based titanium dioxide ink. Fourier Transform–infrared spectroscopy indicated that the amino-modified titanium dioxide and polyurethane acrylate-based titanium dioxide were prepared successfully. The content of the amino groups on the surface of the amino-modified titanium dioxide could be effectively controlled by adjusting the pH value. Moreover, by increasing the content of the amino groups, the viscosity decreased and the photopolymerisation efficiency increased, which was attributed to the formation of branched structures and the promoting effect of the amino groups on the titanium dioxide. The inks with decreased viscosity and branched structures displayed excellent cross-linking properties: viscoelastic transition was achieved within 10 seconds and the final moduli were in the range of 36-55 kPa. The cross-linking degree and rate were more than seven times those of unmodified ink. The ranges of elongation and stress were 95%-165% and 1.9-4.3 MPa, respectively, and the amino group content varied from 0% to 0.101%. In general, polyurethane acrylate-based titanium dioxide was shown to be suitable for blue light-curable ink.

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聚氨酯丙烯酸酯基二氧化钛颜料的制备及其在蓝光固化油墨中的应用

聚氨酯丙烯酸酯基二氧化钛用于制备蓝色光固化油墨，既作为白色颜料替代原来的白色颜料，又作为低聚物。聚氨酯丙烯酸酯基二氧化钛采用两步法制备。第一步，用γ-氨基丙基三乙氧基硅烷接枝二氧化钛，研究接枝过程。其次，采用氨基改性二氧化钛制备聚氨酯丙烯酸酯基二氧化钛，然后用于配置蓝光固化聚氨酯丙烯酸酯基二氧化钛油墨。傅里叶变换红外光谱表明成功制备了氨基改性二氧化钛和聚氨酯丙烯酸酯基二氧化钛。通过调节pH值可以有效控制氨基改性二氧化钛表面氨基的含量。此外，通过增加氨基含量，粘度降低，光聚合效率提高，这归因于支链结构的形成和氨基对二氧化钛的促进作用。具有降低粘度和支化结构的油墨显示出优异的交联性能：在 10 秒内实现粘弹性转变，最终模量在 36-55 kPa 的范围内。交联度和交联率是未改性油墨的7倍以上。伸长率和应力范围分别为95%-165%和1.9-4.3 MPa，氨基含量从0%到0.101%不等。一般来说，