酮肟基硅烷扩链/交联低模量有机硅密封胶的制备及性能  

Preparation and Properties of Solicone Sealant with Low Modulus and High Elongation Through Chain Extend/Crosslink by Using Ketoximosilane

作　　者：徐晓明[1] 高传花[1] 林薇薇[1] 陶小乐[2] 郑苏秦 钟文德[2] 郑强[1] 

机构地区：[1]浙江大学高分子科学与工程学系高分子合成与功能构造教育部重点实验室,浙江杭州310027 [2]杭州之江有机硅化工有限公司研发中心,浙江杭州311203

出　　处：《高分子材料科学与工程》2007年第4期219-221,225,共4页Polymer Materials Science & Engineering

基　　金：国家基础研究专项经费(2005CB623800)资助;国家自然科学基金项目(50373037)资助

摘　　要：以酮肟基硅烷为扩链/交联体系,以自制的含氰基和仲胺基的新型硅烷偶联剂为增粘剂,制备挤出流动性良好、表干时间短、粘接性好、模量低(100%定伸应力<0.4 MPa)、断裂伸长率高(>800%)的有机硅密封胶。讨论了扩链/交联体系、增粘剂类型及用量对有机硅密封胶表干时间、力学性能和粘接性能的影响。发现随扩链剂用量的增大,密封胶的断裂伸长率提高,但强度降低,表干时间延长。只有合理选用交联剂的用量,才能使密封胶固化交联。相对于传统的增粘剂而言,自制的增粘剂可显著提高密封胶的力学性能和粘接强度,缩短表干时间。Silicone sealants with good extrudability, short skin over time, good adhesive properties, low modulus （100% tensile stress 〈0.4 MPa） and high elongation （〉800%） were prepared by using ketoximosilane as chain extend/crosslink agent. Meanwhile, two novel silane coupling agents were synthesized which can be acted as adhesion promoting agent. Influences of chain extend / crosslink system and adhesion promoting agent on skin of the sealant over time, mechanical and adhesive properties of silicone sealant were investigated. The results reveal that increasing the content of chain extend agent could lead to a high elongation and low modulus, but a low tensile strength and long skin over time. Only at proper content of crosslinking agent silicone sealants can be vulcanized. The novel adhesion promoting agents promote the rate of vulcanization and enhance the mechanical properties and adhesive properties with concrete significantly, as compared to the traditional ones.

关 键 词：有机硅 密封胶 低模量 高延伸率 扩链 

分 类 号：TQ324.21[化学工程—合成树脂塑料工业]