光固化E44/CER复配树脂基复合材料的力学性能

采用光固化方式制备了一系列不同混合比的脂环族环氧树脂和E44环氧树脂复配树脂基复合材料补片。拉伸性能测试表明,E44质量分数的增加,会导致复合材料拉伸强度逐渐下降。但是,以此为基础进行粘接修理测试表明,粘接修复效率并不随E44质量分数单调变化。当E44含量为10%时,修复效率最好。     

脂环族环氧树脂／双酚A环氧树脂共混改性研究

采用脂环族环氧树脂（EPL-4221）与双酚A型环氧树脂E-51共混,用酸酐固化剂和促进剂使其固化,研究脂环族环氧树脂的用量对共混树脂性能的影响及其规律性,包括冲击强度、弯曲强度、拉伸强度、维卡软化点温度、漆膜的粘附力、铅笔硬度、耐磨性以及拉伸剪切强度。结果表明,随脂环族环氧树脂用量的增加,共混树脂的综合性能先增加后降低,脂环族环氧树脂的质量分数为15％-20％时,具有最大值。     

脂环族环氧树脂的紫外光固化性能

研究了脂环族环氧树脂CER-170的紫外光固化性能,利用红外光谱对树脂固化前后的结构进行了表征,考查了光固化时间对凝胶率的影响,并对在最佳固化条件下所得的固化产物进行了性能测试。结果表明,在光固化时间为6min时,凝胶率已达80.90％。在此条件下得到的胶膜冲击强度为4．9N·m;柔韧性为2mm,硬度为3H．粘附力为3级。     

电子塑封用脂环族环氧树脂研究进展

结合电子封装的现状、电子塑封材料的发展以及电子封装对塑封材料提出的高性能要求,介绍了新型脂环族环氧树脂及其作为塑封材料的应用前景,其包括耐热型液体、含磷三官能团型、有机硅多官能团脂环族环氧树脂。同时简略介绍了脂环族环氧树脂增韧改性研究动向。     

高性能阻燃环氧灌封胶的制备

采用双酚A型环氧树脂CY5995为基体树脂,酸酐HY227为固化剂,聚磷酸铵(APP)/氢氧化铝(ATH)为复配阻燃剂,硅微粉为填料,脂环族环氧树脂S-186为改性剂制备了环氧灌封胶.通过示差扫描量热分析、热失重分析和氧指数、阻燃级别、弯曲和拉伸强度等测试研究了阻燃剂配比、填料以及脂环族环氧树脂用量等对灌封胶性能的影响...     

光固化涂料用环氧树脂的研究

简要介绍了一种适用于光固化涂料的环氧树脂的制备方法,特性及其应用领域,还讨论了光固化涂料用环氧树脂的特殊性;环氧树脂相对分子质量分布的测定方法;环氧树脂在甲醇中的溶解性。     

山东泰特尔新材料9500t/a专用环氧树脂开工建设

<正>2019年12月4日,山东泰特尔新材料科技有限公司9500t/a特种环氧树脂项目(一期)开工奠基仪式在东营港经济开发区隆重举行。本次开工建设的9500t/a特种环氧树脂项目主要包括新建1套5000t/a 3D打印材料用脂环族环氧树脂生产装置;1套2000t/a环保型UV固化油墨用脂环族环氧树     

特种脂环族环氧树脂

华东理工大学，研制成功特种脂环族环氧树脂——6269环氧树脂，填补国内空白，特种脂环族环氧树脂双戊烯二环氧化物具有高环氧值，低粘度的特性，即是一个耐热性优良的环氧树脂，又是一个性能优异的环氧树脂稀释剂。由于结构特殊，其制备过程复杂，技术难度较大，国内尚不能生产。为解决这一难题，华东理工大学材料科学与工程学院全力展开研究，采用由α-蒎烯经催化异构化制备二烯烃双戊烯，由乙醛经液相催化氧化制备环氧化剂无水过氧乙酸，然后进行环氧化反应的技术路线制得6269环氧树脂，     

光固化碳纤维布/CEP-ES复合材料粘接修理金属损伤结构

设计了具有紫外光辐照引发自蔓延固化特性的脂环族环氧树脂(CEP)与有机硅树脂(ES)的混合树脂体系(CEPES),并以它们为基体实现了碳纤维增强复合材料的快速光固化。研究了以光固化碳纤维复合材料为补片粘接修理金属损伤结构的影响因素。结果表明,有机硅树脂的引入不仅可以有效提高粘接修理的效果,而且可以改善粘接修理结构的耐湿热性能,当ES的质量比为20%~30%时,粘接修理结构具有最好的承载能力;适当增加复合材料补片的长度和层数可以有效提高粘接修理的效果;双面贴补修理比单面贴补修理具有更好的粘接修理效率。     

脂环族环氧化物的合成与应用(1)──脂环族环氧树脂性能及其固化机理

本文论述了（ERL－4221,Unox201,Unox269,Unox206和Unox207等）脂环族环氧树脂的性能、固化机理及应用。与双酚A型和酚醛型环氧对比可以看出,脂环族环氧树脂具有粘度低、耐热性好、电气优良等特点,其可用作稀释剂、粘接剂,并在灌封浇铸料、玻璃钢层压制品,缠绕制品和涂料中广泛应用。     

纸张用光固化涂料的研究

为了满足纸张用光固化涂料的柔性和低黏度要求,首先采用扩链剂二缩三乙二醇与环氧树脂反应,制取柔性环氧,然后用丙烯酸酯化,制得环氧丙烯酸酯预聚体,最后加入稀释剂和光引发剂,制得一种适合纸张浸涂用光固化涂料。涂膜的性能:光固化速率2 5min;硬度HB;耐水性>48h;附着力1级;柔韧性好(对折无痕迹)。     

光固化涂料用低粘度环氧丙烯酸酯的研究

采用双羟基化合物与环氧树脂进行反应,制取低粘度改性环氧树脂,然后用丙烯酸酯化,制得光固化涂料用低粘度环氧丙烯酸酯。研究了催化剂类型和用量对环氧树脂改性反应,以及不同结构、不同链长双羟基化合物和双羟基化合物与环氧树脂当量比对环氧丙烯酸酯粘度及其配制的光固化涂料的性能影响。确定了环氧树脂改性反应和丙烯酸酯化反应的最佳条件。     

Synthesis and thermal stability of a novel cycloaliphatic epoxy resin system

A novel cycloaliphatic epoxy resin was synthesized from dicyclopentadiene, ethylene glycol, and nadic anhydride. The chemical structures of the resultant epoxy resin and its precursor were characterized with Fourier transform infrared spectroscopy, ¹H‐NMR, and mass spectrographic analyses. The thermal stability of the cured polymer was investigated with differential scanning calorimetry and thermogravimetric analysis. Compared with the thermal stability of the commercial cycloaliphatic epoxy resin 3,4‐epoxy cyclohexyl methyl‐3′,4′‐epoxy cyclohexyl carboxylate, a higher thermal stability for the cured polymer of the novel epoxy resin was observed. The results imply that the novel cycloaliphatic epoxy resin has good potential applications in electronic encapsulation. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Preparation and characterization of UV-cured epoxy nanocomposites based on o-montmorillonite modified with maleinized liquid polybutadienes

Polymeric nanocomposites based on an epoxy cycloaliphatic resin and o-montmorillonite (Cloisite 30B^®) modified by reaction with maleinized liquid polybutadienes were prepared through photopolymerization. The conditions for the o-montmorillonite modification were settled. After the reaction, a strong increase of the basal spacing of the nanoclays was evidenced through XRD analysis. The modified clays were dispersed in the epoxy resin (5 wt.%) and subjected to the UV-curing process. The kinetics of the photopolymerization process was evaluated by means of Real-Time FT-IR spectroscopy. The obtained nanocomposites were studied by means of XRD and TEM analyses; the formation of either intercalated or quasi-exfoliated structure was assessed. The thermal and mechanical properties of the cured films were evaluated and correlated to the morphology of the obtained nanocomposites.     

Preparation and mechanism of free-radical/cationic hybrid photosensitive resin with high tensile strength for three-dimensional printing applications

A ultraviolet (UV)-curing free-radical/cationic hybrid resin is designed and developed by blending epoxy resin with an acrylic resin, including N-acryloyl morpholine, polyurethane acrylic ester (PUA), free-radical and cationic photoinitiator. During UV-curing, crosslinking locks the acrylate and epoxide polymers together through non-covalent interaction. Most likely, the interpenetrating polymer network (IPN) structure can be generated in the three-dimensional (3D)-printed objects. The obtained results from Fourier transform infrared spectroscopy (FT-IR) show that bisphenol A epoxy resin and acrylic resin are both successfully involved in the UV-curing process. In addition, the effects of the mass ratio of epoxy to acrylic resin and the UV irradiation time on the properties of the hybrid resin are systematically investigated using liquid crystal display (LCD) 3D printers. It is found that the tensile strength of the hybrid resin increases in a certain range and the elongation at the break maintains an upward trend with the increasing mass ratio. Finally, it is found that the shrinkage of the hybrid resin also depends on the mass ratio of epoxy to acrylic resin, which decreases with the increase of the epoxy resin content in a certain range. Thus, herein we propose a feasible UV-curing mechanism for the synthesis of hybrid resins for 3D printing applications.     

Thermal resistance of cycloaliphatic epoxy hybrimer based on sol‐gel derived oligosiloxane for LED encapsulation

Cycloaliphatic epoxy hybrimer bulk was successfully fabricated by thermal curing of cycloaliphatic epoxy oligosiloxane resin synthesized by a sol‐gel condensation reaction with methylhexahydrophthalic anhydride (MHHPA) and tetrabutylphosphonium methanesulfonate (TBPM). The composition of MHHPA and TBPM in the resin was optimized to minimize yellowness of the cycloaliphatic epoxy hybrimer bulk. The sample with the optimized composition showed little discoloration upon thermal aging at 120°C for 360 h under an air atmosphere. On the basis of its high thermal stability with appropriate hardness and a high refractive index of 1.55, cycloaliphatic epoxy hybrimer bulk can be used as a LED encapsulant for white LEDs. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Cationic UV-curable formulations containing hydroxy functional fluoropolymer resins

A 12-experiment Plackett-Burman screening design was used to evaluate two hydroxy functional fluorocarbon resins as components for cycloaliphatic epoxy-based cationic UV-curable formulations. The effects of six formulation variables were studied: fluoropolymer resin type, ratio of fluoropolymer resin to cycloaliphatic epoxy resin, anion of the photoinitiator, structure of the cycloaliphatic epoxy resin, photoinitiator level, and use of a thermal post cure. Physical properties (tensile strength, elongation, modulus, glass transition temperature (T_g), equilibrium modulus), yellowing after QUV exposure, water sensitivity, and coefficient of friction values for the 12 formulations were measured. The relationships between the formulation variables and the coating/film properties are discussed. 1122 St. Charles St., Elgin, IL 60120, e-mail: gnoren@dsmdesotech.com.     

UV固化环氧丙烯酸酯的合成和水性化研究

紫外光固化技术是一项节能和环保的新技术。环氧丙烯酸酯由于具有对环境污染少、能耗低、效率高、收缩性小、化学稳定性好的优点,是目前应用最广的光固化预聚物之一。本文以丙烯酸和环氧树脂NPER-032为原料,合成可紫外光固化环氧丙烯酸酯,进一步用顺丁烯二酸酐与该环氧丙烯酸酯反应,在分子链中引入羧基,再用有机胺与之中和,合成水性紫外光固化环氧丙烯酸酯。     

光固化环氧乳液的合成及性能研究

以环氧树脂为基体通过丙烯酸类单体的接枝聚合改性,而后在侧链中引入甲基丙烯酸缩水甘油酯(GMA),以后乳化的方式制得在光引发剂作用下可以光固化的水性环氧树脂涂料,成功地对中相对分子质量环氧树脂进行改性,制得低VOC的性能优良的产品。并在制备光固化水性环氧乳液的过程中通过正交试验的方法对各个条件不同所引起的漆膜的性能作了分析,并对乳液分布均匀性进行了表征。最后得到综合性能优良的紫外光固化水性环氧树脂涂料。