环氧乳液处理对松木尺寸稳定性的影响  

Effect of Epoxy-Polyvinylidene Chloride Double Emulsion Treatment on Dimensional Stability of Poplar

作　　者：刘克言 刘宇杰 LIU Keyan;LIU Yujie(College of Materials Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]中南林业科技大学材料科学与工程学院,湖南长沙410004

出　　处：《山东化工》2024年第24期35-38,共4页Shandong Chemical Industry

摘　　要：本工作采用真空浸渍的方式将固含量15%(质量分数)的环氧乳液引入到松木中,通过评价松木改性前后的平衡含水率(EMC)、吸水率与体积膨胀率、抗体积膨胀率(ASE)和接触角等参数,探究了水性环氧对松木尺寸稳定性的影响。结果表明,改性后松木的EMC值为6.107,比空白松木的EMC值降低了32.611%。经过192 h吸水后,空白松木的吸水率和体积膨胀率分别为73.582%和10.709%,而环氧乳液处理后的松木的吸水率和体积膨胀率分别为58.715%和5.438%,出现了明显的下降。经过干-湿循环3次后,环氧乳液处理松木的ASE为36.183%。此外,空白松木的端面和截面的接触角分别为77.8°±1.9°和96.6°±2.5°,而环氧乳液处理松木的端面和截面的接触角为98.8°±3.9°和121.2°±2.2°。这表明采用水性环氧改性处理能有效地提高松木的尺寸稳定性。In this work,epoxy emulsion with 15%solid content was introduced into pine by vacuum impregnation.The effects of water-based epoxy on the dimensional stability of pine were investigated by evaluating the equilibrium moisture content(EMC),water absorption and volume expansion,volume expansion resistance(ASE)and contact angle of pine before and after modification.The results show that the EMC value of modified pine is 6.107,which is 32.611%lower than that of blank pine.After 192 h water absorption,the water absorption rate and volume expansion rate of blank pine were 73.582%and 10.709%,respectively,while the water absorption rate and volume expansion rate of the pine treated with epoxy emulsion were 58.715%and 5.438%,respectively,showing a significant decline.After 3 dry-wet cycles,ASE of epoxy emulsion treated pine wood was 36.183%.In addition,the contact angles of the end face and section of the blank pine were 77.8°±1.9°and 96.6°±2.5°,respectively,while the contact angles of the end face and section of the epoxy emulsion treated pine were 98.8°±3.9°and 121.2°±2.2°.This indicates that the dimensional stability of pine wood can be effectively improved by using water-based epoxy modification.

关 键 词：环氧乳液 尺寸稳定性 吸水率 抗体积膨胀率 

分 类 号：TQ91[化学工程]