A straw-soy protein composite(SSPC)material:preparation,physical properties and wetting drying stability  

作　　者：Ranqin Xu Junhua Huang Shengkai Xu Shenglong Cai Wen Liu 

机构地区：[1]Department of Civil Engineering,Beijing Forestry University,Beijing 100083,China [2]Institute for Green Building,Beijing Forestry University,Beijing 100083,China

出　　处：《Low-carbon Materials and Green Construction》2024年第1期251-261,共11页低碳材料与绿色建造(英文)

基　　金：supported by 2024 Beijing Forestry University Student Innovation and Entrepreneurship Training Program(Grant Number:X202410022059).

摘　　要：The use of bio-based biomass construction materials has the advantage of helping to reduce fossil energy demand,protecting the environment from carbon dioxide emission and reducing the production of non-degradable waste.This paper used resin-modified soy protein(SP)adhesive to combine rice straw stalks,and made straw-soy protein composites(SSPC)material.The physical properties,compressive behavior and stability during wetting drying cycles of SSPC were measured.Due to water evaporation,the SP matrix is full of connected pores,resulting to its physical properties of small density,high shrinkage ratio and low thermal conductivity,which are 0.24 g/cm^(3),16.2%,and 0.065 W/(m•K),respectively.Adding straw is helpful to the physical properties of SP matrix,leading to an obvious decrease in shrinkage ratio and thermal conductivity of SSPC,which are 8.51%and 0.075 W/m•K.Furthermore,the compressive load-displacement curves of SSPC groups divide into two types:divergent and convergent.The compressive strength of divergent samples is decided by the critical displacement determined according to the convergent specimens.It shows that straw stalk proves the positive effect on the compressive property of SP matrix.As to the mass of SSPC samples during the wetting drying cycles,it drops apparently in the initial three cycles,and becomes negligible from the fifth cycle,meaning that the stability of SSPC during wetting drying cyclic process is quite good.The research result would be helpful for using SSPC as building material,especially as thermal insulation material.生物质建筑材料对化石燃料的依赖低,能够显著减少二氧化碳排放及不可降解废弃物的生成,从而有效保护环境。本文将树脂改性大豆蛋白(SP)胶粘剂与秸秆结合,制备了秸秆-大豆蛋白复合材料(SSPC),并研究了SSPC的物理性能、抗压性能及其在干湿循环条件下的稳定性。研究结果表明,由于水分蒸发作用,SP基质形成了连通孔隙结构,使基体具有低密度(0.24 g/cm^(3))、高收缩率(16.2%)和低热导率(0.065 W/m•K)的特征。相较于SP基体,SSPC的收缩率和热导率都显著降低,分别为8.51%和0.057 W/m•K,表明添加秸秆能够改善材料的物理性能。进一步,SSPC试样的压缩荷载-位移曲线表现为发散型和收敛型两种形式。发散型试样的抗压强度是根据收敛型试样确定的临界位移对应的荷载来决定。测试结果显示,秸秆对SP基体的抗压性能有积极作用。在干湿循环测试中,SSPC试样的质量在最初的三个循环中明显下降,而从第五个循环开始,试样的质量下降可以忽略不计,表明SSPC具有较好的干湿稳定性。研究结果可为SSPC用作建筑材料、尤其是保温隔热材料提供理论参考。

关 键 词：Straw-soy protein composites Shrinkage ratio Thermal conductivity Compressive behavior Mass loss 

分 类 号：TB3[一般工业技术—材料科学与工程]