硅烷偶联剂对咖啡渣的表面改性及其对咖啡渣/聚丙烯木塑复合材料性能的影响  

Surface modification of spent coffee grounds by the silane coupling agent and its effect on the properties of spent coffee grounds/polypropylene wood-plastic composites

作　　者：宋文敏 陈晨[1] 江明明 李世奇 蔡玉荣[1] SONG Wenmin;CHEN Chen;JIANG Mingming;LI Shiqi;CAI Yurong(School of Materials Science&Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学材料科学与工程学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2023年第5期560-565,共6页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：浙江省国际科技合作项目-双边产业联合研发计划项目(2022C04027)。

摘　　要：为解决咖啡渣(Spent coffee grounds,SCG)与聚丙烯(Polypropylene,PP)界面相容性差的问题,研究3种不同类型的硅烷偶联剂改性SCG及其对SCG/PP木塑复合材料性能的影响。以3-氨丙基三甲氧基硅烷(3-aminopropyl trimethoxy-silane,KH540)、3-氨丙基三乙氧基硅烷(3-aminopropyl triethoxy-silane,KH550)和乙烯基三甲氧基硅烷(vinyl trimethoxy-silane,A171)这3种硅烷偶联剂作为表面改性剂,分别对SCG进行表面改性处理,并将改性SCG作为填料,通过熔融共混法制备了SCG/PP木塑复合材料;采用场发射扫描电子显微镜、傅里叶红外光谱仪和视频接触角仪对SCG的微观形貌、官能团特征和亲疏水性进行分析,并通过万能试验机、场发射扫描电子显微镜、热重分析仪、差示扫描量热仪、X射线衍射仪测试SCG/PP复合材料的力学性能、界面相容性、热稳定性、熔融结晶性能。结果表明:这3种硅烷偶联剂均成功接枝到SCG上,并有效提高了SCG的疏水性,增强了与PP之间的界面结合能力。3种硅烷偶联剂均可提高复合材料的拉伸强度,同时降低断裂伸长率;其中硅烷偶联剂A171改性制备的复合材料综合性能最好,拉伸强度比未经改性处理的SCG/PP复合材料提高48.6%,断裂伸长率仅下降4.4%。该研究可为解决SCG与PP界面相容问题及制备高性能SCG/PP复合材料提供参考。To solve the poor interface compatibility between spent coffee grounds(SCG)and polypropylene(PP),we studied the effects of three different coupling agents on the properties of SCG/PP wood-plastic composites.The three coupling agents,i.e.3-aminopropyl trimethoxy-silane(KH540),3-aminopropyl triethoxy-silane(KH550)and vinyl trimethoxy-silane(A171),were used as surface modifiers for surface modification of SCG,and the surface-modified SCG as filler to prepare SCG/PP wood-plastic composites by melt blending.The microscopic morphology,functional groups,hydrophilicity and hydrophobicity of the modified SCG were analyzed by SEM,FTIR and video contact angle instrument.The mechanical properties,interface compatibility,thermal stability and melt crystallization properties of SCG/PP composites were analyzed by universal testing machine,SEM,TGA,DSC and XRD.The results show that the three coupling agents are all successfully connected to SCG,which effectively improves the hydrophobicity of SCG and enhances the interfacial binding ability with PP.The three coupling agents can improve the tensile strength and reduce the elongation at break of the composites.Specifically,the composite prepared by A171 treatment has the best comprehensive properties,the tensile strength is 48.6%higher than that of untreated SCG/PP,and the elongation at break is only 4.4%lower.This study provides reference for solving the interface compatibility problem of SCG and PP and preparing high-performance SCG/PP composites.

关 键 词：硅烷偶联剂 咖啡渣 聚丙烯 熔融共混 木塑复合材料 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]