脲醛树脂/单分散二氧化硅纳米胶黏剂  

Urea-Formaldehyde Resin/Monodispersed Silica Nano Adhesive

作　　者：崔举庆[1] 韩书广[1] 贾翀[1] 张洋[1] 曹流[1] 刘竹[1] 

机构地区：[1]南京林业大学,南京210037

出　　处：《东北林业大学学报》2011年第2期79-81,共3页Journal of Northeast Forestry University

基　　金：江苏省博士后科研资助计划项目(0901080C);南京林业大学2009年大学生实验室创新项目

摘　　要：采用Stber方法合成了4种单分散二氧化硅颗粒,透射电子显微镜显示颗粒大小分别为190、100、60、30 nm,并研究了其对脲醛树脂胶黏剂性能的影响。结果表明,二氧化硅颗粒尺寸对胶合强度和甲醛释放量的影响存在显著的尺寸效应。随着颗粒的减小,胶合强度增加,达到国家标准要求的0.7 MPa以上;甲醛释放量显著降低,从E2级降到E1,低于1.5 mg/L。其中颗粒大小为100 nm的综合效果最好,100 nm以下的颗粒不能进一步降低甲醛释放量,可能是纳米颗粒之间的强烈相互作用而产生的聚集所致。硅烷偶联剂处理60 nm的二氧化硅表面,甲醛释放量能够继续降低,说明颗粒之间的聚集对性能有影响。Four different sizes of monodispersed silica particles were fabricated using Stber method.TEM result showed that the size of silica was 190,100,60 and 30 nm respectively,and the influence of silica on the urea-formaldehyde adhesive was also investigated.The effect of remarkable size on the dried and wet bonding strength（≥0.7 MPa） was observed.The bonding strength increased with the decrease of the size of silica.The formaldehyde emission decreased from E2 to E1, and it was less than 1.5 mg/L.The optimum size of silica was 100 nm,which could be caused by the conglomerations of nanoparticles.Nanoscale silica treated with silane coupling agent exhibited lower formaldehyde emission levels,indicating the existence of conglomeration of nanoparticles.

关 键 词：脲醛树脂 二氧化硅 甲醛释放量 胶合强度 

分 类 号：S784[农业科学—林学]