环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

光敏树脂对快速原型件表面质量的影响

为评价光敏树脂HSL 1的性能,比较了HSL 1和光敏树脂SL 7545的特性参数、力学性能和黏度,结果显示两种光敏树脂性能相近。研究了两种光敏树脂对快速原型件表面质量的影响,对快速原型件表面粗糙度值的研究表明:快速原型件的上水平表面质量最好,下水平表面质量最差,侧表面质量受倾斜角度影响;且快速原型件表面质量受到光敏树脂组分、透射深度、单层固化强度和黏度的影响。     

PP/CPE共混性能研究

研究了氯化聚乙烯(CPE)用量对聚丙烯/氯化聚乙烯(PP/CPE)材料的熔融时间、扭矩、表观黏度、氧指数和拉伸强度的影响,并通过扫描电镜研究了共混物的拉伸断面结构。结果表明:熔体最大扭矩和熔融时间随着CPE用量的增加而下降,而平衡扭矩和表观黏度上升,当CPE质量分数介于33%～45%之间时达到最优配比。另外,随着CPE用量的增加,共混物的阻燃性能显著增加,但拉伸强度在CPE质量分数大于20%后稍有下降。     

杂醇油制备环氧树脂活性稀释剂的研究

介绍了利用杂醇油合成环氧树脂活性稀释剂的方法 ,该方法可以消除制酒等工艺的下脚料杂醇油对环境污染的现象 ,变废为宝 ,具有一定的经济效益和社会效益。     

高碘酸氧化-滴定碘法测定甘油含量的研究

鉴于用密度法测定甘油的含量在某种程度上存在着不确切性 ,故提出用高碘酸氧化滴定磺法测定甘油的含量。该方法比密度法准确、可靠     

Synthesis of A Novel UV-curable Oligmer 1,4-cyclohexanedimethanol Glycidyl Ether Acrylate and Study on Its UV-curing Properties

A novel UV-curable oligmer 1,4-cyclohexanedimethanol glycidyl ether acrylate(CHDMGEA) was synthesized by utilizing 1,4-cyclohexanedimethanol glycidyl ether(CHDMGE) and acrylic acid(AA) as starting materials, triphenyl phosphine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were that the concentration of triphenyl phosphine was 0.90% of reactants by weight, the concentration of p-hydroxyanisole was 0.20% of reactants by weight, the reaction temperature was 90-100 ℃, and the molar ratio of CHDMGE to AA was 0.5:1.1. The experimental results show that CHDMGEA is a kind of good UV-curable oligmer. The impact resistance of the UV-cured films with CHDMGEA as oligmer to prepare UV-curing coating was superior to that of the UV-cured films with bisphenol A diglycidyl ether diacrylate(BPGEA) as oligmer to prepare UV-curing coating.     

Synthesis of a novel UV-curable prepolymer hexanediol diglycidyl ether diacrylate and its cured film tensile property

A novel UV-curable prepolymer hexanediol diglycidyl ether diacrylate (HDGEA) was synthesized by utilizing hexanediol diglycidyl ether (HDGE) and acrylic acid (AA) as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimal synthetic conditions were that the concentration of N, N-dimethylbenzylamine was 0.80 wt% of reactants, the concentration of p-hydroxyanisole was 0.3 wt% of reactants, the reaction temperature was 90-110 ℃, and the molar ratio of HDGE to AA was 1︰2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-curing initiator was added to the synthesized HDGEA to prepare a kind of UV-curing coating. The mechanical properties of the UV-cured films were determined, giving 31.87 MPa of tensile strength, 871.88 MPa of Young’s modulus and 6.77% of elongation at tear.     

Preparation of a Novel Cationic Photosensitive Resin(3D-SLR01) for Stereolithography 3D Printing and Determination of Its Some Properties

A novel cationic photosensitive resin(3 DSLR-01) for stereolithography 3 D printing was prepared with 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexane carboxylate(2021 P),1,4-cyclohexanedimethanol glycidyl ether(JX-026), diglycidyl 4,5-epoxycyclohexane-1,2-dicarboxylate(S-186), polycaprolactone polyol(Polyol-0305), novolac epoxy resin(F-51), bis(3-ethyl-3-oxetanylmethyl) ether(S-221) and a mixture of triarylsulfonium hexafluoroantimonate salts solution(UVI-6976). The properties of the photosensitive resin and its UV-cured films were investigated by some instruments and equipment.The experimental results show that the critical exposure(Ec) of the photosensitive resin is 16.3 mJ/cm~2, the penetration depth(D_p) is 0.14 mm, and the optical property of the photosensitive resin is excellent. Rectangle plates were printed by using a stereolithography apparatus(HRPL-150 A) with the photosensitive resin as the manufacturing material, and the shrinkage rates of the plates were less than 0.60%, which showed that the accuracy of the manufactured plates was very high.     

一种新型紫外光固化光敏预聚物的合成及性能测试

以三苯基膦为催化剂、对羟基苯甲醚为阻聚剂,利用双酚A缩水甘油醚(E-51型环氧树脂),丁基缩水甘油醚(JX-013)和丙烯酸为主要原料合成了一种新型低黏度的丙烯酸酯预聚物。研究了反应温度,阻聚剂、催化剂用量这些因素对其反应的影响,较好的合成反应条件是:温度90~110℃,三苯基膦质量分数为0.80%,对羟基苯甲醚质量分数为0.20%~0.40%。将这种新型低黏度的丙烯酸酯预聚物作为光敏预聚物直接加入引发剂1-羟基环己基苯甲酮(Irgacure184)配制成紫外光固化材料,对其光固化膜进行了柔韧性、拉伸性能、冲击性和硬度测试。实验结果表明:其光固化膜柔韧性通过了轴棒6,光固化膜拉伸强度为35.33MPa,杨氏模量为1 486.52 MPa和断裂伸长率为4.78%,冲击性能为25kg·cm和硬度为2H。     

气相色谱测定三甘醇混合物的研究

研究了用气相色谱仪测定三甘醇混合物中三甘醇含量的方法 ,分为归一法和内标法。如果三甘醇混合物样品含水量甚微 ,以及各组分都能在色谱图上出峰显示 ,则用归一法能测得三甘醇含量的准确结果。如果三甘醇混合物样品中含有一定量的水以及四甘醇等高沸物 ,则用 1 ,4丁二醇为内标 ,运用内标法能准确测定三甘醇含量