竹纤维-隔热颗粒复合芯材真空绝热板的制备  

Preparation of vacuum insulation panels with core materials of bamboo fiber/thermal insulation particle composites

作　　者：闫雯 董旭 张志诚 范毜仔 陈礼辉[1] 赵伟刚[1] YAN Wen;DONG Xu;ZHANG Zhicheng;FAN Mizi;CHEN Lihui;ZHAO Weigang(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350108,China;Civil Engineering Department,School of Engineering and Design,Brunel University,London,UB83PH,UK)

机构地区：[1]福建农林大学材料工程学院,福建福州350108 [2]布鲁奈尔大学工程设计学院土木工程系,伦敦UB83PH

出　　处：《森林与环境学报》2022年第2期208-216,共9页Journal of Forest and Environment

基　　金：国家自然科学基金面上项目(31971593);国家自然科学基金面上项目(32071688);福建省自然科学基金项目(高校联合资金)(2019J01386);福建农林大学科技创新专项基金项目(CXZX2019103)。

摘　　要：为了研究隔热颗粒种类和添加量对竹纤维真空绝热板(VIP)性能的影响,降低VIP的生产成本,先将隔热颗粒以不同添加量加入漂白竹浆中均匀混合,经打浆、抄造、烘干后制得竹纤维-隔热颗粒复合芯材,经真空封装后得到竹纤维-隔热颗粒复合芯材VIP,用扫描电镜和压汞仪研究不同隔热颗粒添加量对复合芯材微观孔隙结构的影响,用透气度测试仪和抗张试验机测试复合芯材的机械力学性能,用热流法导热仪测定复合芯材VIP的导热系数。结果表明,竹纤维表面及竹纤维相互交织形成的三维网络结构中随机分散有隔热颗粒;隔热颗粒A较隔热颗粒B可以更有效地降低复合芯材VIP的导热性能;在隔热颗粒A添加量(质量分数)为30%时,复合芯材VIP导热系数最小,为11.4 mW·(m·K)^(-1),隔热性能良好,且在未添加吸气剂的情况下,长期放置(201 d)后,复合芯材VIP导热系数为13.0 mW·(m·K)^(-1)。与未添加隔热颗粒A的竹纤维VIP相比,复合芯材VIP稳定性和耐候性能较好,服役寿命也相对较长。利用隔热颗粒代替部分竹纤维制备竹纤维-隔热颗粒复合芯材VIP,不仅可以进一步降低生产成本,还可以有效提高VIP的保温隔热性能。In order to investigate the effect of different insulation particle types and addition amounts on the properties of bamboo fiber-based vacuum insulation panels(VIP),so as to provide theoretical support for the development and application of VIP containing bamboo fiber/insulation particle composite core materials,this study added two different kinds of insulation particles into bleached bamboo pulp with different addition amounts,followed by even mixing.The bamboo fiber/insulation particle composite core material was prepared by beating and drying,and then by vacuum packaging.Scanning electron microscopy(SEM)and mercury injection apparatus were used to study the effects of different amounts of insulation particles on the micropore structure of the composite core material.A permeability tester and tensile tester were used to determine the properties of the composite core material.The thermal conductivity of the VIP was measured using a heat flow thermal conductivity instrument.The results show that the thermal insulation particles are randomly scattered on the surface of bamboo fiber,and a three-dimensional network structure is formed by the interweaving of the bamboo fibers.Compared with thermal insulation particle B,thermal insulation particle A can reduce the thermal conductivity of the VIP containing the composite core material more effectively.When the addition amount of insulation particle A is 30%,the thermal conductivity of the VIP with the composite core material is as low as 11.4 mW·(m·K)^(-1).In the case of long-term placement(201 d)without adding the absorber,the thermal conductivity of the VIP with the composite core material is approximately 13.0 mW·(m·K)^(-1).Compared with the VIP using bamboo fiber without insulation particle A,the VIP with the composite core materials offers better stability and weather resistance,and its service life is relatively long.The use of insulation particles to replace part of the bamboo fiber in the preparation of VIP containing bamboo fiber/insulation particle compo

关 键 词：竹纤维 隔热颗粒 复合芯材 真空绝热板 微观孔隙结构 力学性能 导热系数 

分 类 号：TU111.41[建筑科学—建筑理论] TU551