邵康宸 卜彦强 史洪源 陈文静



摘要:实验以双酚A型环氧树脂为基体树脂、线性酚醛树脂为固化剂、丁腈橡胶为增韧剂和氮化硼(BN)为填料,添加适量的活性稀释剂——烯丙基缩水甘油醚(AGE)等其他助剂制备环保型导热性环氧树脂胶粘剂,研究基体树脂、增韧剂、填料、固化剂用量等因素对环氧树脂胶粘剂性能的影响结果表明,采用正交试验法优选出制备环保型导热性环氧树脂胶粘剂的最佳工艺:在温度120 ℃条件下固化1 h,再在温度180 ℃条件下固化2 h,丁腈橡胶质量分数为15%、线性酚醛树脂质量分数为10%和氮化硼的质量分数为25%,环氧树脂胶粘剂导热系数为0.962 W/(m·K),粘接强度为42.91 MPa。
关键词:环氧树脂;固化剂;导热性;环保
中图分类号:TQ433.4
文献标识码:A文章编号:1001-5922(2022)06-0013-04
Preparation andproperties of thermal conductive adhesive
SHAO Kangchen, BU Yanqiang, SHI Hongyuan, CHEN Wenjing
(College of Aeronautical Materials Engineering, Xian Aeronautical Polytechnic Institute, Xian 710089, China
)
Abstract:In the experiment, bisphenol A epoxy resin was used as matrix resin, linear phenolic resin as curing agent, nitrile rubber as toughening agent, Boron Nitride (BN) as filler, and an appropriate amount of active diluent age and other additives such as Allyl Glycidyl Ether (AGE) were added to prepare environment-friendly thermal conductivity epoxy resin adhesive. The effects of matrix resin, toughening agent, filler and curing agent on the properties of epoxy resin adhesive were studied. The results showed that the best process for preparing environment-friendly thermal conductivity epoxy resin adhesive was optimized by orthogonal test: curing at 120 ℃ for 1 h, and then curing at 180 ℃ for 2 h,the mass fraction of nitrile rubber was 15%, the mass fraction of linear phenolic resin was 10% and the mass fraction of boron nitride was 25%, the thermal conductivity of epoxy resin adhesive is 0.962 W/(m·K), and the bonding strength is 42.91 MPa.
Key words:epoxy resin; curing agent; thermal conductivity; environment-friendly
环氧树脂优良的物理机械和电绝缘性能、与各种材料的粘接性能、以及其使用工艺的灵活性是其他热固性塑料所不具备的[1-3]。因此它能制成涂料、復合材料、浇铸料、胶粘剂、模压材料和注射成型材料,在国民经济的各个领域中得到广泛的应用[4-5]。环氧胶粘剂是结构胶粘剂的重要品种,主要由环氧树脂和固化剂两大部分组成[6]。为改善某些性能,满足不同用途加入增韧剂、稀释剂、促进剂、偶联剂等辅助材料[7-8]。由于环氧胶粘剂的粘接强度高、通用性强,曾有“万能胶”、“大力胶”之称[9-10],在航空、航天、汽车、机械、建筑、化工、轻工、电子、电器以及日常生活等领域得到广泛的应用。
当前,随着机械、电子、航天、航空等工业的快速发展,环保型胶粘剂变得越来越重要,需求量也越来越大。……