纳米二氧化钛改性光固化树脂的研究

Study on nano-titanium dioxide modified UV-curable resin

以纳米TiO2的丙二醇甲醚醋酸酯(PMA)分散液为添加剂改性激光快速成型用光固化树脂SPR4000,通过对树脂及固化物的酸值、分子质量、IR、DSC、热重分析、流变性及力学和热性能测试等研究了改性后光固化树脂的性能,并用扫描电镜对纳米TiO2在树脂中的分散情况进行了观察。结果表明添加的二氧化钛质量分数为0.75%时,体系力学性能最好,拉伸强度提高15.25%,冲击强度提高41.35%,弯曲强度提高41.75%,耐热性也有所提高。纳米二氧化钛PMA分散液的加入解决了纳米二氧化钛在树脂中的分散稳定性问题,保证了树脂体系的固化速度及交联密度,满足了制作工艺,提高了光固化树脂SPR4000的力学性能。

The nano-TiO2 dispersed in propylene glycol monomethyl ether acetate（PMA） was used as additive to modify the UV-curable SPR4000 resin for stereolithography（SL）.The properties of modified UV-curable resins were investigated by the testings of acid value,molecular weight,IR,DSC,TG rheology,mechanical property and thermal property of the modified resin and the cured product.The distribution of nano-TiO2 in UV-curable resin was observed by SEM.The rescult showed that the resin with mass fraction of liquid nano-TiO2 0.75% had the optimium mechanical properties and the tensile strength,impact strength and flexural strength were increased by 15.25%,41.35% and 41.75%,respectively.The heat resistance was also improved.The problem of dispersion stability of nano-TiO2 in UV-curable resin was solved by the addtion of nano-TiO2 PMA dispersion.The curing rate and crosslink density of UV-curable resin were ensured for meeting the production process and the mechanical properties of UV-curable resin were improved.