高折射率光学树脂的研究进展

杨雨彤¹，吴淑芳^1,2，刘晓暄¹

（1.广东工业大学材料与能源学院，广东广州  510006；

2.广东深展实业有限公司，广东揭阳  522061）

【摘  要】近年来，高折射率（n）光学树脂因其性能优异受到广泛关注，已广泛应用在先进光电子制造领域。本文重点介绍了增加光学树脂的n值和阿贝数（υ）的设计概念，简要介绍了开发高n值光学树脂的基本方法和重要参数。综述了过去十年高折射率树脂的研究进展，从高折射率光学树脂的设计原理以及含硫型、含卤、含磷、有机-无机杂化等高折射光学树脂研究现状等方面进行梳理，并列举了高折射率光学树脂在光学胶粘剂、发光二极管（LED）封装材料、光学透镜等方面的一些应用。最后对高折射率光学树脂的未来发展进行了展望。

【关键词】高折射率；光学树脂；研究进展

环氧树脂固化促进剂的研究及应用

李  栓^1,2，张宝艳¹，杨继萍²，张  思¹，白  钰¹，王伟翰¹

（1.中国航空制造技术研究院复合材料技术中心，北京  101300；2.北京航空航天大学材料科学与工程学院，北京  100191）

【摘  要】环氧树脂由于其优异的性能，使其在胶粘剂、涂层以及复合材料等领域获得了广泛的应用。为了提高固化速率，同时对于一些热敏感的部件来说，温度是一个重要的指标，需要降低固化温度，因此，加入固化促进剂是必要的。本文主要综述了环氧树脂固化促进剂的研究进展及应用情况，包括叔胺及其盐类固化促进剂、三苯基膦及其鏻盐固化促进剂、取代脲固化促进剂、咪唑及其盐类固化促进剂、三氟化硼胺络合物固化促进剂等，并指出了未来的发展方向。

【关键词】环氧树脂；固化速率；热敏感；固化温度；固化促进剂；发展方向

LED封装用环氧树脂AB胶的进展

王清元，王文军

(大连凯华新技术工程有限公司，辽宁大连  116318)

【摘  要】本文介绍了国内LED封装用环氧树脂AB胶的发展历程，从最初的液体双酚A环氧树脂的应用，到脂环族环氧树脂以及最近有机硅杂化脂环族环氧树脂的应用。重点分享了直插式LED以及数码管封装用环氧树脂胶、SMD RGB封装用环氧树脂AB胶以及Mini LED封装用环氧树脂AB胶（如复合胺固化的环氧树脂AB胶、哑光显示屏封装用环氧树脂AB胶、热阳离子固化的环氧树脂AB胶以及酸酐固化有机硅杂化脂环族环氧树脂AB胶等）的配方、性能和国内外研究进展，并对未来新型环氧树脂的开发要求和发展趋势进行了展望。

【关键词】LED；环氧树脂；酸酐；有机硅杂化环氧树脂

基于多重氢键自愈合光学胶的制备与性能研究

叶迪辉^1,2，汪加胜¹，唐舫成¹，乔立根^1,2，齐圣光^1,2，曾西洋^1,2

（1.广州鹿山新材料股份有限公司，广东广州  510530；2.广州鹿山先进材料有限公司，广东广州  510530）

【摘  要】在消费电子和5G通讯快速发展趋势下，OCA光学胶在光电子领域的需求持续增加。然而，在OCA光学胶的使用或加工过程中，常常会出现由材料缺陷而导致材料性能变差的问题，甚至进一步导致材料的报废，这使得具有自愈合能力的OCA光学胶表现出巨大的市场潜力。本文制备了一种含四重氢键的2-脲基-4[1H]-嘧啶酮甲基丙烯酸甲酯（UPyMA）单体，将质量分数分别为5%、10%、15%和20%的UPyMA引入到聚氨酯丙烯酸酯、丙烯酸-2-乙基己基酯和丙烯酸异冰片酯共聚物体系中。使用2-羟基-2-甲基苯基丙烷-1-酮作为光引发剂，g-缩水甘油醚氧丙基三甲氧基硅烷作为增黏偶联剂，通过紫外光引发聚合制备了一系列具有自愈合功能的OCA光学胶，并测定或表征了其结构、透光率、流变性能、拉伸性能以及自愈合等性能。研究结果表明：⑴成功制备了UPyMA和一系列具有自愈合功能的OCA光学胶。⑵所有OCA光学胶都未产生气泡和晶点，并且它们雾度都小于0.50，可满足触控显示领域产品对OCA光学胶的需求。⑶对加入UPyMA不同质量分数（0~20%）的OCA光学胶进行不锈钢板的180°剥离力测试，当UPyMA含量为15%时，粘接力最大（为25.5 N）。⑷分析了添加不同含量UPyMA的OCA光学胶储能模量（G'）和损耗模量（G"）的温度依赖性。所有OCA光学胶在室温下具有较好的流动性和界面润湿性能，从而赋予了OCA光学胶较好的粘接性能。⑸加入UPyMA后的自愈合效率明显提高，为延长材料使用寿命提供了有利条件。⑹高温高湿耐老化试验表明，所制备产品均可满足应用要求，表明其在高温高湿下具有较好的耐老化性能。

【关键词】OCA光学胶；UPyMA单体；紫外光引发聚合；自愈合

氨基酸功能化二硫化钼/环氧树脂复合材料耐水性能的研究

曹宇鑫¹，吴绵园¹，赵  明^1,3，张  斌^1,2，孙明明¹，张绪刚¹，张  雪¹，李坚辉¹，

(1.黑龙江省科学院石油化学研究院，黑龙江哈尔滨  150040；2.哈尔滨工程大学，黑龙江哈尔滨  150001；3.哈尔滨理工大学，黑龙江哈尔滨  150040)

【摘  要】环氧树脂因其优异物理化学性能在各种高新领域得到了重要发展。近年来随着材料科学在某些极端环境下的需求越来越多，对提高环氧树脂的耐水性需求日渐迫切。本文首先制备了氨基乙酸（Gly）改性二硫化钼(MoS₂)纳米片，然后用其改性环氧树脂，制备了Gly-MoS₂/环氧树脂复合材料。对其结构、微观形貌、力学性能、热机械性能和吸水率等指标进行表征。研究结果表明：⑴成功制备了目标产物，经氨基乙酸剥离和改性的MoS₂纳米片在树脂基体中分散更均匀，在保证适宜的横向尺寸的同时厚度更薄，与基体树脂相容性更好。⑵随着纳米片添加量的增加，树脂体系水煮后的常温和高温剪切强度、拉伸强度和抗冲击强度均有提升。这是由于改性后纳米片在基体中分散均匀，且与环氧基形成更稳定的海岛结构，从而提升了材料本身的耐水性。⑶热机械性能测试表明，Gly-MoS₂纳米片对增强材料水煮后的耐温性有着重要的作用。吸水率测试表明，Gly-MoS₂极大地改善了环氧树脂的耐水性能，并且随着Gly-MoS₂纳米片的增加，吸水率随之降低。其中1.00%Gly-MoS₂/环氧树脂体系的耐水效果最好，水煮192 h后最终吸水率仅为1.2%。

【关键词】纳米复合材料；聚合物基复合材料；耐水性；机械性能

压敏胶乳液的泡沫产生机理及应用性能影响研究

张  鹏，李  莹，贾永华，王乐歌，郭  宁，张慧琴，程靖轩，李华新，林昱辉

（湖北航天化学新材料科技有限公司，湖北襄阳  441003）

【摘  要】制备了不同乳化剂用量的丙烯酸乳液，分析了丙烯酸乳液配方合成工艺及泡沫产生的机理，探讨了乳化剂用量、乳液表面张力、乳液固含率和消泡剂对压敏胶乳液泡沫及应用性能的影响。明确了乳化剂较高的起泡率、泡沫过高的表面张力、高固含乳液导致旋转黏度偏大、消泡剂选型与用量等因素是泡沫产生的主要原因。研究结果表明：⑴乳化剂的用量不仅对压敏胶耐候性及乳液聚合稳定性有较大的影响，同时对泡沫的产生也有较大影响。综合考虑，乳化剂的用量控制在0.50%为宜。⑵压敏胶乳液体系中表面张力控制直接关系到泡沫表面张力的变化，乳液表面张力应控制在38~40 mN/m范围内。⑶压敏胶乳液固含率直接影响乳液的旋转黏度和泡沫量，对乳液应用性能有着至关重要的影响。⑷适量添加消泡剂是提升压敏胶乳液消泡能力的最佳方案，应用条件较为便利。不同体系的消泡剂对泡沫的消除都有较好的效果，其中矿物油消泡剂-A和聚醚消泡剂-C在添加质量分数为0.05%时，能提供较好的消泡性能、耐候性能和成膜性能，其综合应用效果优于其他体系消泡剂。⑸消泡剂的添加方式可以影响消泡剂的分散性能，采用乳液乳化分散的方式可以很好地改善消泡剂的分散性，降低乳液泡沫的同时，改善乳液的成膜性能。

【关键词】压敏胶乳液；泡沫；消泡剂；乳化剂；表面张力

UV光固化可剥离压敏胶带的研制

冯  笑^1,2，陈亚芹^1,2，张旭锋^1,2，胡永其²，王志宏²，李玉川²

（1.山东奥卓新材料有限公司，山东滕州  277599；2.北京理工大学鲁南研究院，山东滕州  277599）

【摘  要】以聚丙烯酸酯压敏胶为基胶，加入齐聚物、多官能团活性稀释剂和光引发剂配制成胶液，然后涂敷于PET基膜上制备成UV光固化可剥离压敏胶带。研究了齐聚物、多官能团活性稀释剂和光引发剂的用量对胶带性能的影响，通过测试180°剥离强度、残胶情况优化出各组分最佳用量，并利用傅里叶红外光谱对其光固化过程进行了表征。研究结果表明：⑴聚丙烯酸酯胶粘剂129A基体为100份、齐聚物用量30份、活性稀释剂用量50份、光引发剂用量0.8份时，制备的UV固化可剥离型胶带减黏效果突出，无残胶，综合性能优异。与晶圆初始粘着力高达10.3 N/25 mm，经UV光照射后瞬间失黏，粘接力为0.3 N/25 mm，易剥离，满足芯片的特殊加工要求。⑵利用傅里叶红外光谱仪对光固化反应过程进行了表征。随着光固化过程的进行，碳碳双键的红外吸收峰逐渐减弱至消失，体系中发生了碳碳双键交联反应，形成交联结构，使胶由“黏”变为“失黏”。

【关键词】压敏胶；UV固化；齐聚物；活性稀释剂

聚硫氨酯密封剂的性能和影响因素研究

彭峪清，秦蓬波，章谏正

（中国航发北京航空材料研究院，北京  100095）

【摘  要】本文使用5种不同二异氰酸酯、5种不同催化剂对聚硫代醚的体系进行硫化，制成了一种新型的聚硫氨酯密封剂材料。通过红外光谱手段分析了材料的组成，并对比了不同种类的固化剂、催化剂和聚硫代醚生胶对材料的力学性能和工艺性能的影响。研究结果表明：选择IPDI和HMDI作为聚硫氨酯的硫化体系较为合适；PC-41和1-甲基咪唑的催化效率较为适中，且对异氰酸酯与水的反应催化效率不高，比较适合作为聚硫氨酯硫化的催化剂；通过对聚硫氨酯密封剂硫化前后的结构进行表征，说明整个硫化反应进行完全；随着聚硫代醚生胶分子量的下降，对应聚硫氨酯密封剂的拉伸强度上升，断裂伸长率下降；通过力学性能和耐油性能研究发现，采用HMDI制备的聚硫氨酯密封剂性能较为优异，相较于普通聚硫代醚密封剂，其力学性能获得了提升，且保留了耐油性能，在航空航天领域具有一定的应用价值。

【关键词】聚硫氨酯；密封剂；力学性能；工艺性能

电子元器件粘接用单组分环氧胶的制备与性能研究

龚秋燕，李吉明，钱仁杰，魏云峰，王昌勇

(苏州艾迪亨斯胶粘技术有限公司，江苏苏州  215101）

【摘  要】针对电子元器件粘接用途，制备了单组分中低温固化环氧胶粘剂。主要研究了不同类型环氧树脂、填料以及固化促进剂对其拉伸剪切强度、拉伸强度、断裂伸长率和固化性能的影响。研究结果表明：以双酚F型环氧树脂为基础聚合物制备的单组分环氧胶粘剂，相对于双酚A型及聚氨酯改性型环氧树脂，显示出更优的粘接强度及较低的硬度；搭配碳酸钙使用时，拉伸剪切强度较硅微粉、高岭土明显提升，且断裂伸长率达到约55%，具有一定的弹性；采用相同量的促进剂，固化促进速率依次为改性脲促进剂＞改性胺促进剂＞咪唑促进剂；开发的单组分环氧胶粘剂产品在常温下可正常存放3周，使用方便，兼具良好的固化效率，力学性能优异，可应用于电子元器件的结构粘接。

【关键词】环氧树脂；填料；促进剂；拉伸剪切强度；贮存稳定性；中低温固化

纳米TiO₂对口腔粘结剂性能的影响研究

苏佳峰，武  峰，李  倩，张晓晓，郭巧玲，田国兵

（山西医科大学口腔医院口腔修复科，山西太原  030006）

【摘  要】以2,4,6-三甲基苯甲酰基-二苯基氧化膦为光引发剂，甲基丙烯酸甲酯为单体，白炭黑为补强填料，纳米二氧化钛（TiO₂）颗粒为抗菌填料，制备了口腔粘结剂。研究了纳米TiO₂尺寸、用量对粘结剂力学性能和抗菌性能的影响。研究结果表明：⑴纳米TiO₂尺寸是影响粘结剂力学性能的重要因素，选用粒径为30 nm的TiO₂进行填充较为适宜；⑵纳米TiO₂添加量是影响粘结剂力学性能的另一个重要因素。当TiO₂添加量为5.0%时，粘结剂的力学性能提升最显著。⑶纳米TiO₂的尺寸和添加量是影响抗菌性能的重要因素。当粘结剂中纳米TiO₂的粒径为30 nm，添加质量分数为5.0%时，抗菌率达到97.46%，满足行业抗菌率标准的要求。

【关键词】二氧化钛；粘结剂；光催化；力学性能；抗菌性能

改性新型涂层材料制备及其防腐性能研究

张滨莹，叶一鸣，文振兴，陈佳雨，祁  滔，何晓红，马艾丽

（北京理工大学珠海学院，广东珠海  519088）

【摘  要】为了解决纳米SiO₂、六方氮化硼（BN）固体填料在树脂中的分散效果，利用硅烷偶联剂（KH-560）对二者进行表面处理。在共混体系中加入偶联剂作相容剂，增加与聚二甲基硅氧烷（PDMS）及环氧树脂的相容性，利用超声方式使复合体系充分分散，以发挥填料的性能，得到了具有疏水效果的防腐蚀环氧复合涂层。利用正交试验对其配方组成、涂层样品的各方面性能深入研究，并对其结构、接触角、附着力、电化学、耐介质腐蚀等方面进行测试和分析。研究结果表明：⑴硅烷偶联剂KH-560成功接枝于纳米SiO₂和六方BN上，在树脂中的相容性好。⑵根据对样品涂层各测试指标的结果分析，得到各填料添加量对各性能指标的影响程度及最佳水平级别。⑶填料的引入使涂层接触角有明显增加，接触角即涂层疏水性随3种填料添加量呈现正相关趋势。极差分析表明，3种填料的最佳水平均为第4水平，改性六方BN添加量水平对涂层疏水性影响最明显。⑷根据耐酸碱盐介质测试结果可知：涂层样品对于碱性和浓盐介质的防护能力优于对酸介质，在碱性及浓盐介质中基本不发生发泡、损坏、腐蚀现象。⑸正交试验中最佳配方为：PMDS添加量为0.5 g，改性纳米SiO₂添加量为2.0 g，改性六方BN添加量为1.00 g。

【关键词】防腐涂料；疏水性；配方；表面改性；复合材料

Research progress on high refractive index optical resin

Yang Yutong¹,Wu Shufang^1,2, Liu Xiaoxuan¹

(1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, China; 2. Guangdong Shenzhan Industrial Co., Ltd., Jieyang  522061, Guangdong, China)

【Abstract】In recent years, high refractive index (n) optical resins have received widespread attention due to their excellent properties and have been widely used in advanced optoelectronic manufacturing. In this article, the design concept of increasing the n-value and Abbe number (υ) of optical resins was emphatically introduced,and the basic methods and important parameters for developing high n-value optical resins were briefly introduced. The research progress of high refractive index resins in the past decade was reviewed, and the design principles of high refractive index optical resins as well as the research status of sulfur-containing, halogenated, phosphorus containing, organic-inorganic hybrid high refractive index optical resins were summarized. Some applications of high refractive index optical resins in optical adhesives, light-emitting diode (LED) packaging materials, optical lenses, etc were also listed. Finally, the future development of high refractive index optical resins was prospected.

【Keywords】high refractive index; optical resin; research progress

Research and application of epoxy resin curing accelerator

Li Shuan^1,2, Zhang Baoyan¹, Yang Jiping², Zhang Si¹, Bai Yu¹, Wang Weihan¹

(1.AVIC Manufacturing Technology Institute Composite Technology Center, Beijing  101300, China; 2. School of Materials Science and Engineering, Beihang University, Beijing  100191, China)

【Abstract】Epoxy resin has been widely used in the fields of adhesives, coatings, and composite materials due to its excellent properties. In order to improve the curing rate, and for some heat sensitive components, temperature is an important indicator, it is necessary to lower the curing temperature. Therefore, it is necessary to add curing accelerator. In this article, the research progress and application of curing accelerators for epoxy resin, including tertiary amine and its salt curing accelerators, triphenylphosphine and its salt curing accelerators, substituted urea curing accelerators, imidazole and its salt curing accelerators, boron trifluoride amine complex curing accelerators, etc. were mainly summarized, and the future development direction was pointed out.

【Keywords】epoxy resin; curing rate; heat sensitive; curing temperature; curing accelerator; development direction

Progress of epoxy resin AB adhesive for LED encapsulation

Wang Qingyuan, Wang Wenjun

（Dalian Kaihua New Technology Engineering Co., Ltd., Dalian 116318, Liaoning, China）

【Abstract】In this paper, the development process of epoxy resin AB adhesive for LED encapsulation in China, from the initial application of liquid bisphenol A epoxy resin to cycloaliphatic epoxy resin, and recently the application of silicone hybrid cycloaliphatic epoxy resin was introduced. The formulation, performance, and research progress of epoxy resin adhesive for direct-insertion LED and digital tube encapsulation, epoxy resin AB adhesive for SMD RGB encapsulation, and epoxy resin AB adhesive for Mini LED encapsulation (such as compound amine cured epoxy resin AB adhesive, epoxy resin AB adhesive for matte display screen encapsulation, heat cation-cured epoxy resin AB adhesive, and anhydride-cured silicone hybrid cycloaliphatic epoxy resin AB adhesive, etc.) both domestically and internationally were shared in details. The development requirements and trends of future new epoxy resins were also discussed.

【Keywords】LED; epoxy resin; anhydride; silicone hybrid epoxy resin

Preparation and performance study of multiple hydrogen bonds-based self-healing optical adhesive

Ye Dihui^1,2, Wang Jiasheng¹,Tang Fangcheng¹, Qiao Ligen^1,2, Qi Shengguang^1,2,Zeng Xiyang^1,2

(1.Guangzhou Lushan New Materials Co., Ltd., Guangzhou  510530, Guangdong, China; 2.Guangzhou Lushan Advanced Materials Co., Ltd., Guangzhou  510530, Guangdong, China)

【Abstract】Under the rapid development trend of consumer electronics and 5G communication, the demand for OCA optical adhesive in the field of optoelectronics continues to increase. However, during the use or processing of OCA optical adhesive, the problem of deterioration of material properties due to material defects often occurs, even further leading to the scrapping of materials, which makes OCA optical adhesive with self-healing ability show great market potential. In this paper, 2-ureido-4[1H]-pyrimidinone methacrylate (UPyMA) monomer containing quadruple hydrogen bonds was prepared, and UPyMA with mass fractions of 5%, 10%, 15%, and 20% was introduced into a copolymer system of polyurethane acrylate, 2-ethylhexylacrylate and isobornyl acrylate, respectively. A series of OCA optical adhesives with self-healing function were prepared by UV induced polymerization, with 2-hydroxy-2-methylphenylpropane-1-ketone as the photoinitiator and g-glycidoxypropyltrimethoxysilane as the tackifier coupling agent. Their structures, light transmittance, rheological properties, tensile properties, and self-healing properties were measured or characterized. The research results showed that, ⑴UPyMA and a series of OCA optical adhesives with self-healing function were successfully prepared. ⑵ All OCA optical adhesives did not produce bubbles or crystal dots, and their haze was all less than 0.50, which could meet the demand for OCA optical adhesives in the field of touch display products. ⑶ The 180° peel strength of OCA optical adhesives with different mass fractions (0-20%) of UPyMA was tested on stainless steel plates. When the UPyMA content was 15%, the bonding power was the highest (25.5 N). ⑷ The temperature dependence of storage modulus (G') and loss modulus (G") of OCA optical adhesives with different contents of UPyMA was analyzed. All OCA optical adhesives had good flowability and interfacial wetting properties at room temperature, which endowed OCA optical adhesives with good bonding properties. ⑸ The self-healing efficiency was significantly improved after adding UPyMA, providing favorable conditions for extending the service life of the material. ⑹ The high-temperature and high humidity aging resistance test showed that the prepared products could meet the application requirements, indicating that they had good aging resistance under high-temperature and high humidity conditions.

【Keywords】OCA optical adhesive; UPyMA monomer; UV induced polymerization; self-healing

Study on water resistance of amino acid functionalized molybdenum disulfide/epoxy resin composite materials

Cao Yuxin¹, Wu Mianyuan¹, Zhao Ming^1,3, Zhang Bin^1,2, Sun Mingming¹, Zhang Xugang¹, Zhang Xue¹, Li Jianhui¹

(1.Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin  150040, Heilongjiang, China; 2. Harbin Engineering University, Harbin  150001, Heilongjiang, China; 3.Harbin University of Science and Technology, Harbin  150040, Heilongjiang, China)

【Abstract】Epoxy resin has made significant progress in various high-tech fields due to its excellent physical and chemical properties. In recent years, with the increasing demand for materials science in certain extreme environments, the need to improve the water resistance of epoxy resin has become increasingly urgent. In this paper, glycine (Gly) modified molybdenum disulfide (MoS₂) nanosheets were first prepared, and then they were used to modify epoxy resin, and Gly-MoS₂/epoxy resin composite materials were obtained. The structure, microstructure, mechanical properties, thermomechanical properties, and water absorption rate were characterized. The research results showed that,⑴The target products were successfully prepared, and MoS₂ nanosheets that had been exfoliated and modified by glycine were more evenly dispersed in the resin matrix. While ensuring appropriate lateral dimensions, the thickness was thinner and the compatibility with the matrix resin was better. ⑵With the increase of the addition amount of nanosheets, the shear strength, tensile strength, and impact strength of resin systems at room temperature and high temperature after boiling were all improved. This was because the modified nanosheets were uniformly dispersed in the matrix and formed a more stable sea-island structure with the epoxy group, thereby improving the water resistance of the material itself. ⑶The thermomechanical performance tests showed that Gly-MoS₂ nanosheets played an important role in enhancing the temperature resistance of materials after water boiling. The water absorption test showed that Gly-MoS₂ greatly improved the water resistance of epoxy resin, and the water absorption rate decreased with the increase of Gly-MoS₂ nanosheets. The water resistance of the 1.00% Gly-MoS₂/epoxy resin system was the best, with a final water absorption rate of only 1.2% after boiling for 192 h.

【Keywords】nanocomposite material; polymer-based composite material; water resistance; mechanicalproperty

Study on foam formation mechanism and application performance of pressure sensitive adhesive emulsion

Zhang Peng, Li Ying, Jia Yonghua, Wang Lege, Guo Ning,

Zhang Huiqin, Cheng Jingxuan, Li Huaxin, Lin Yuhui

(Hubei Aerospace Chemical New Materials Co., Ltd., Xiangyang  441003, Hubei, China)

【Abstract】Acrylic emulsion with different emulsifier dosages was prepared. The synthesis process of acrylic emulsion formula and the mechanism of foam formation were analyzed. The influence of emulsifier dosage, emulsion surface tension, emulsion solid content and defoamer on the foam and application performance of pressure sensitive adhesive emulsion was discussed. It was clear that the main reasons for foam formation were the high foaming rate of emulsifier, the high surface tension of foam, the high rotational viscosity because of high solid content of emulsion, and the selection and amount of defoamer.The research results showed that, ⑴ The emulsifier dosage not only had a great impact on the weather resistance of pressure sensitive adhesive and the stability of emulsion polymerization, but also had a great impact on the foam formation. Taking all factors into consideration, it was advisable to control the dosage of emulsifier at 0.50%. ⑵ The control of surface tension in the pressure sensitive adhesive emulsion system was directly related to the change of foam surface tension, and the emulsion surface tension should be controlled within the range of 38-40 mN/m. ⑶ The solid content of pressure sensitive adhesive emulsion had a direct impact on the rotational viscosity of emulsion and foam content, and also had a crucial impact on the application performance of emulsion. ⑷ Adding an appropriate amount of defoamer was the best scheme to improve the defoaming ability of pressure sensitive adhesive emulsion, and the application conditions were convenient. Different systems of defoamers had good effects on the elimination of foam. Mineral oil defoamer-A and polyether defoamer-C could provide good defoaming performance, weather resistance and film forming performance when the mass fraction was 0.05%, and their comprehensive application effect was better than other systems of defoamers. ⑸ The addition mode of defoamer could affect the dispersion performance of defoamer. The emulsification dispersion mode of emulsion could improve the dispersion of defoamer, reduce the foam of emulsion, and improve the film forming performance of emulsion.

【Keywords】pressure sensitive adhesive emulsion; foam; defoamer; emulsifier; surface tension

Research and development of UV-curing strippable pressure sensitive adhesive tape

Feng Xiao^1,2,Chen Yaqin^1,2, Zhang Xufeng^1,2, Hu Yongqi², Wang Zhihong², Li Yuchuan²

(1.Shandong Aozo New Materials Co., Ltd., Tengzhou  277599, Shandong, China; 2.Lu’nan Research Institute of Beijing Institute of Technology, Tengzhou  277599, Shandong, China)

【Abstract】The UV-curing strippable pressure sensitive adhesive tape was prepared by using polyacrylate pressure sensitive adhesive as the base adhesive, adding oligomers, multifunctional active diluents, and photoinitiators to form the adhesive solution, and then coating it on the PET-based film. The influence of the dosage of oligomers, multifunctional active diluents and photoinitiators on the properties of adhesive tape was studied. The optimal dosage of each component was optimized by testing the 180° peel strength and residual adhesive situation, and the UV curing process was characterized by using Fourier transform infrared spectroscopy. The research results showed that, ⑴ When the matrix of polyacrylate adhesive 129A was 100 parts, the amount of oligomer was 30 parts, the amount of active diluent was 50 parts, and the amount of photoinitiator was 0.8 parts, the UV-curing strippable adhesive tape prepared had outstanding adhesive reduction effect, no residue, and excellent comprehensive performance. The initial adhesion force with the wafer was as high as 10.3 N/25 mm, but it instantly lost adhesion after UV light irradiation, with an adhesion force of 0.3 N/25 mm. It was easy to peel off and met the special processing requirements of the chip. ⑵ The UV curing reaction process was characterized by using Fourier transform infrared spectroscopy. As the light curing process progressed, the infrared absorption peak of the carbon-carbon double bond gradually weakened to disappeared, and the carbon-carbon double bond crosslinking reaction occurred in the system, forming the crosslinked structure and causing the adhesive to change from "sticky" to "non sticky".

【Keywords】pressure sensitive adhesive; UV curing; oligomer; active diluent

Performance and influencing factors of polythiourethane sealant

Peng Yuqing, Qin Pengbo, Zhang Jianzheng

(AECC Beijing Institute of Aeronautical Materials, Beijing  100095, China)

【Abstract】In this paper, 5 different diisocyanates and 5 different catalysts were used to vulcanize polythioether system, and a new type of polythiourethane sealant material was produced. The composition of the material was analyzed by infrared spectroscopy, and the effects of different types of curing agents, catalysts, and polythioether raw adhesive on the mechanical and process properties of the material were compared. The research results showed that choosing IPDI and HMDI as the vulcanization systems for polythiourethane was relatively suitable. The catalytic efficiency of PC-41 and 1-methylimidazole was relatively moderate, and their catalytic efficiency for the reaction of isocyanates with water was not high, making them suitable as catalysts for the vulcanization of polysulfides. By characterizing the structure of polythiourethane sealant before and after vulcanization, it was demonstrated that the entire vulcanization reaction was complete. As the molecular weight of polythioether raw adhesive decreased, the tensile strength of the corresponding polythiourethane sealant increased, while the elongation at break decreased. Through the study of mechanical properties and oil resistance, it was found that the performance of polythiourethane sealant prepared by HMDI was superior. Compared with ordinary polythioether sealant, its mechanical properties had been improved while retaining oil resistance, and it had certain application value in the aerospace field.

【Keywords】polythiourethane; sealant; mechanical property; process performance

Preparation and properties of single component epoxy adhesive for electronic component bonding

Gong Qiuyan, Li Jiming, Qian Renjie, Wei Yunfeng, Wang Changyong

(Suzhou Adhesive Technology Co., Ltd., Suzhou 215101, Jiangsu, China)

【Abstract】The single component medium & low-temperature curing epoxy adhesive was prepared for electronic component bonding. The effects of different types of epoxy resins, fillers, and curing accelerators on their tensile shear strength, tensile strength, elongation at break, and curing properties were mainly studied. The research results showed that the single component epoxy adhesive prepared based on bisphenol F-type epoxy resin exhibited better bonding strength and lower hardness compared to bisphenol A-type and polyurethane modified epoxy resin. When used in combination with calcium carbonate, the tensile shear strength was significantly improved compared to silicon micro powder and kaolin, and the elongation at break reached about 55%, indicating a certain degree of elasticity. Using the same amount of accelerator, the curing promotion rate was in the order of modified urea accelerator > modified amine accelerator > imidazole accelerator. The developed single component epoxy adhesive product could be stored normally for 3 weeks at room temperature, was easy to use, had good curing efficiency and excellent mechanical properties, which could be applied to the structural bonding of electronic components.

【Keywords】epoxy resin; filler; accelerator; tensile shear strength; storage stability; medium & low-temperature curing

Effect of nano TiO₂on the performance of oral adhesive

Su Jiafeng, Wu Feng, Li Qian, Zhang Xiaoxiao, Guo Qiaoling, Tian Guobing

(Department of Prosthodontics, Shanxi Medical University School and Hospital of Stomatology, Taiyuan  030006, Shanxi, China)

【Abstract】The oral adhesive was prepared by using 2,4,6-trimethylbenzoyl diphenyl phosphine oxide as the photoinitiator, methyl methacrylate as the monomer, white carbon black as the reinforcing filler, and nano titanium dioxide(TiO₂) particles as the antibacterial filler. The effects of nano TiO₂ size and addition amount on the mechanical and antibacterial properties of the adhesive were studied. The research results showed that, ⑴ The size of nano TiO₂was an important factor affecting the mechanical properties of adhesive, and it was more suitable to use TiO₂ with a particle size of 30 nm for filling. ⑵ The addition amount of nano TiO₂ was another important factor affecting the mechanical properties of adhesive. When the addition amount of TiO₂ was 5.0%, the mechanical properties of the adhesive were significantly improved. ⑶ The size and addition amount of nano TiO₂ were important factors affecting its antibacterial performance. When the particle size of nano TiO₂ in the adhesive was 30 nm and the addition mass fraction was 5.0%, the antibacterial rate reached 97.46%, meeting the requirements of industry's antibacterial rate standard.

【Keywords】titanium dioxide; adhesive; photocatalysis; mechanical property; antibacterial performance

Preparation of modified novel coating materials and their anticorrosion properties

Zhang Binying, Ye Yiming, Wen Zhenxing, Chen Jiayu, Qi Tao, He Xiaohong, Ma Aili

(Beijing Institute of Technology, Zhuhai  519088, Guangdong, China)

【Abstract】In order tosolve the dispersion effect of nano SiO₂and hexagonal boron nitride (BN) solid fillers in resin, surface treatment was carried out on both by using silane coupling agent (KH-560).By adding coupling agent as compatibilizer in the blend system, the compatibility with polydimethylsiloxane (PDMS) and epoxy resin was increased. The composite system was fully dispersed by using ultrasound to enhance the properties of the filler, resulting in the anticorrosion epoxy composite coating with hydrophobic effect. The in-depth research on its formula composition and various properties of coating samples was conducted by using orthogonal experiment, and its structure, contact angle, adhesion, electrochemistry, and resistance to medium corrosion were tested and analyzed. The research results showed that, ⑴ Silane coupling agent KH-560 was successfully grafted onto nano SiO₂ and hexagonal BN, with good compatibility in the resin. ⑵ Based on the analysis of the test indicators of the sample coating, the influence degree and optimal level of each filler addition on various performance indicators were determined. ⑶ The introduction of fillers significantly increased the contact angle of the coating, and the contact angle, i.e. the hydrophobicity of the coating, showed a positive correlation trend with the addition amount of three fillers. Range analysis showed that the optimal level for all three fillers was the fourth level, and the level of modified hexagonal BN addition had the most significant effect on the hydrophobicity of the coating. ⑷ According to the test results of acid, alkali and salt media resistance, it could be seen that the coating sample had better protection ability against alkaline and concentrated salt media than against acidic media, and there was basically no foaming, damage or corrosion phenomenon in alkaline and concentrated salt media. ⑸ The optimal formula in the orthogonal experiment was: PMDS addition of 0.5 g, modified nano SiO₂addition of 2.0 g, and modified hexagonal BN addition of 1.00 g.

【Keywords】anticorrosive coating; hydrophobicity; formulation; surface modification; composite material