【摘要】：3D打印光敏樹(shù)脂具有成型精度高、加工速度快以及力學(xué)性能優(yōu)良的特點(diǎn),被廣泛應(yīng)用于汽車制造業(yè)、鑄造業(yè)、醫(yī)學(xué)等眾多領(lǐng)域。但由于收縮率、凝膠含量、固化時(shí)間、粘度以及硬度等影響打印制品的質(zhì)量,因此研究高質(zhì)量的光敏樹(shù)脂的工藝配方具有重要的意義。以雙酚F環(huán)氧樹(shù)脂和丙烯酸為原料,經(jīng)過(guò)聚合反應(yīng)得到雙酚F環(huán)氧丙烯酸酯預(yù)聚物,然后按照70%:26%:4%的比例與稀釋劑二縮三丙二醇二丙烯酸酯(TPGDA)和光引發(fā)劑α,α-二甲氧基苯偶�？s酮(BDK)配制成雙酚F型光敏樹(shù)脂,將光敏樹(shù)脂的收縮率和凝膠含量作為指標(biāo)考察影響樹(shù)脂性能的合成工藝。經(jīng)正交實(shí)驗(yàn)得到的最佳合成條件為:四甲基氯化銨為催化劑,用量為原料總質(zhì)量的1.0%;對(duì)苯二酚為阻聚劑,用量為原料總質(zhì)量的0.1%;反應(yīng)溫度為100℃;m(環(huán)氧樹(shù)脂):m(丙烯酸)=1:0.8;反應(yīng)時(shí)間4h。結(jié)果表明:利用最佳條件下得到的雙酚F型光敏樹(shù)脂收縮率為5.05%,凝膠含量為92.25%,固化時(shí)間為13s,相比于雙酚A型環(huán)氧樹(shù)脂收縮率降低30%,凝膠含量增加3%,固化時(shí)間縮短了 28%,對(duì)紫外光的靈敏性和吸收能力都相對(duì)增加,可以用于3D打印。選擇雙酚F環(huán)氧丙烯酸酯為預(yù)聚物,TPGDA為稀釋劑,2,4,6-三甲基苯甲�；交趸�(TPO)為光引發(fā)劑;通過(guò)研究各組分添加比例對(duì)光敏樹(shù)脂的性能的影響,確定了各組分質(zhì)量比為70%:26%:4%;熱致變色材料添加的質(zhì)量比為5%時(shí)在光敏樹(shù)脂中分散均勻。配制所得的光敏樹(shù)脂黏度為458 mPa·s,打印制品收縮率為4.34%,凝膠含量為90.65%,固化時(shí)間為13s,在140℃下變色明顯且可逆,可以用于無(wú)源無(wú)芯片溫度標(biāo)簽。氧化石墨烯材料添加的質(zhì)量比為0.10%時(shí),經(jīng)顯微鏡下觀察在光敏樹(shù)脂中分散均勻。最終配制所得的光敏樹(shù)脂黏度為468mPa·s,打印制品收縮率為4.14%,凝膠含量為89.65%,固化時(shí)間為15s,拉伸強(qiáng)度為21.65MPa,鉛筆硬度為5H,相比于普通光敏樹(shù)脂,硬度增加了 4個(gè)硬度級(jí),拉力增強(qiáng)了 30%。配制好的光敏樹(shù)脂在打印過(guò)程中會(huì)出現(xiàn)一定的缺陷,打印復(fù)雜結(jié)構(gòu)有缺口,打印平板結(jié)構(gòu)有翹曲變形,根據(jù)實(shí)驗(yàn)對(duì)缺陷的原因進(jìn)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 偽, 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 偽 -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，

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