3D打印材料光敏树脂的改性研究
发布时间：2018-11-18 09:01
【摘要】：3D打印光敏树脂具有成型精度高、加工速度快以及力学性能优良的特点,被广泛应用于汽车制造业、铸造业、医学等众多领域。但由于收缩率、凝胶含量、固化时间、粘度以及硬度等影响打印制品的质量,因此研究高质量的光敏树脂的工艺配方具有重要的意义。以双酚F环氧树脂和丙烯酸为原料,经过聚合反应得到双酚F环氧丙烯酸酯预聚物,然后按照70%:26%:4%的比例与稀释剂二缩三丙二醇二丙烯酸酯(TPGDA)和光引发剂α,α-二甲氧基苯偶酰缩酮(BDK)配制成双酚F型光敏树脂,将光敏树脂的收缩率和凝胶含量作为指标考察影响树脂性能的合成工艺。经正交实验得到的最佳合成条件为:四甲基氯化铵为催化剂,用量为原料总质量的1.0%;对苯二酚为阻聚剂,用量为原料总质量的0.1%;反应温度为100℃;m(环氧树脂):m(丙烯酸)=1:0.8;反应时间4h。结果表明:利用最佳条件下得到的双酚F型光敏树脂收缩率为5.05%,凝胶含量为92.25%,固化时间为13s,相比于双酚A型环氧树脂收缩率降低30%,凝胶含量增加3%,固化时间缩短了 28%,对紫外光的灵敏性和吸收能力都相对增加,可以用于3D打印。选择双酚F环氧丙烯酸酯为预聚物,TPGDA为稀释剂,2,4,6-三甲基苯甲酰基二苯基氧化膦(TPO)为光引发剂;通过研究各组分添加比例对光敏树脂的性能的影响,确定了各组分质量比为70%:26%:4%;热致变色材料添加的质量比为5%时在光敏树脂中分散均匀。配制所得的光敏树脂黏度为458 mPa·s,打印制品收缩率为4.34%,凝胶含量为90.65%,固化时间为13s,在140℃下变色明显且可逆,可以用于无源无芯片温度标签。氧化石墨烯材料添加的质量比为0.10%时,经显微镜下观察在光敏树脂中分散均匀。最终配制所得的光敏树脂黏度为468mPa·s,打印制品收缩率为4.14%,凝胶含量为89.65%,固化时间为15s,拉伸强度为21.65MPa,铅笔硬度为5H,相比于普通光敏树脂,硬度增加了 4个硬度级,拉力增强了 30%。配制好的光敏树脂在打印过程中会出现一定的缺陷,打印复杂结构有缺口,打印平板结构有翘曲变形,根据实验对缺陷的原因进行了分析。
[Abstract]:The 3D printing Guang Min resin is widely used in many fields such as automobile manufacturing industry, foundry industry, medicine and so on, because of its high forming precision, fast processing speed and excellent mechanical properties. However, the shrinkage, gel content, curing time, viscosity and hardness affect the quality of printing products, so it is of great significance to study the technological formulation of high quality Guang Min resin. Using bisphenol F epoxy resin and acrylic acid as raw materials, the prepolymer of bisphenol F epoxy acrylate was obtained by polymerization, and then the diluent, tripropanediol diacrylate (TPGDA) and photoinitiator 伪, were prepared by 70: 26: 4% ratio of bisphenol F epoxy resin and acrylic acid. The bisphenol F type Guang Min resin was prepared by 伪 -dimethoxybenzoyl ketone (BDK). The shrinkage and gel content of Guang Min resin were used as indexes to investigate the synthetic process which affected the properties of the resin. The optimum synthesis conditions obtained by orthogonal experiment are as follows: tetramethylammonium chloride as catalyst, dosage as 1.0 of the total mass of raw material, hydroquinone as inhibitor, dosage as 0.1 of the total mass of raw material, reaction temperature at 100 鈩，
本文编号：2339562
[Abstract]:The 3D printing Guang Min resin is widely used in many fields such as automobile manufacturing industry, foundry industry, medicine and so on, because of its high forming precision, fast processing speed and excellent mechanical properties. However, the shrinkage, gel content, curing time, viscosity and hardness affect the quality of printing products, so it is of great significance to study the technological formulation of high quality Guang Min resin. Using bisphenol F epoxy resin and acrylic acid as raw materials, the prepolymer of bisphenol F epoxy acrylate was obtained by polymerization, and then the diluent, tripropanediol diacrylate (TPGDA) and photoinitiator 伪, were prepared by 70: 26: 4% ratio of bisphenol F epoxy resin and acrylic acid. The bisphenol F type Guang Min resin was prepared by 伪 -dimethoxybenzoyl ketone (BDK). The shrinkage and gel content of Guang Min resin were used as indexes to investigate the synthetic process which affected the properties of the resin. The optimum synthesis conditions obtained by orthogonal experiment are as follows: tetramethylammonium chloride as catalyst, dosage as 1.0 of the total mass of raw material, hydroquinone as inhibitor, dosage as 0.1 of the total mass of raw material, reaction temperature at 100 鈩，
本文编号：2339562
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