文献类型：期刊文献

中文题名：薄膜层数对热塑性树脂胶合板性能的影响

英文题名：Effects of number of film layers on properties of thermoplastic bonded plywood

作者：方露[1] 殷月红[1] 韩于露[1] 常亮[2] 吴智慧[1]

第一作者：方露

机构：[1]南京林业大学家居与工业设计学院;[2]中国林业科学研究院木材工业研究所

年份：2016

卷号：1

期号：6

起止页码：45-50

中文期刊名：林业工程学报

外文期刊名：Journal of Forestry Engineering

收录：CSTPCD;;北大核心:【北大核心2014】；

基金：江苏省自然科学基金项目(BK20150881);中国林科院林业新技术所基本科研业务费专项(CAFINT2014C02);南京林业大学青年科技创新基金(CX2015020);江苏省高等学校大学生创新创业训练计划项目(SPITP201610298127H)

语种：中文

中文关键词：HDPE薄膜;热塑性树脂胶合板;硅烷改性;耐高温性能

外文关键词：HDPE film; thermoplastic bonded plywood; silane treatment; thermal stability

分类号：TS653.3

摘要：为了解决人造板产品游离甲醛释放的问题,以高密度聚乙烯(high density polyethylene,HDPE)薄膜作为胶黏剂,采用热压-冷压联用的平压工艺,分别对杨木单板与硅烷改性单板进行胶接,制备了不同HDPE薄膜层数(1,2,3和4层)的热塑性树脂胶合板,并测定了胶合板的物理力学性能。结果表明,薄膜层数对未处理材和硅烷处理材性能的影响变化规律相似。随着HDPE层数的增加,热塑性树脂胶合板的胶合强度无显著变化,耐水性能和抗弯性能逐步改善,耐高温破坏能力降低。当层数相同时,硅烷处理材的综合性能远优于未处理材。对于未处理材,当仅使用2层HDPE薄膜时,胶合强度值超过07 MPa,达到Ⅰ类胶合板的用材要求。对于硅烷处理材,当使用1层HDPE薄膜时,板材的综合性能最好,耐高温破坏能力最强,胶合强度达到189 MPa,木破率增加至95%,24 h吸水率降低至6224%,130℃时板材的标准化模量值比未处理材提高了80%,tanδmax值对应的温度点由141℃升至180℃。
In order to alleviated the formaldehyde emission problem in the production and use of wood-based panels, high density polyethylene （HDPE） films were selected as wood adhesives to bond untreated poplar veneers and silane- treated veneers respectively using hot fiat-pressing followed by cold fiat-pressing. Physical-mechanical properties and thermal stability of the thermoplastic bonded plywood using different HDPE film layers （ 1,2,3 and 4 layers between ev- ery two veneers） were investigated by the mechanical testing machine and dynamic mechanical analysis （DMA）. Results showed that the number of HDPE film layers had a similar impact on both the untreated and silane-treated panels. It had a slight effect on shear strength while played an important role in water absorption and bending strength of the plywood. When the HDPE film increased from 1 layer to 4 layers, the water resistance and bending strength of the plywood greatly enhanced. Because of the melting behavior of thermoplastic polymer, the thermal stability of the HDPE film bonded ply- wood was weakened with the increasing film dosage. The performance of silane-treated panels was much better than the untreated samples at the same number of the HDPE film layers. Only when 2-layer HDPE films were used between every two untreated veneers, the shear strength of the untreated plywood was higher than 0.7 MPa and just met the requirement for type I grade plywood in accordance with GB/T 9846. 3-2004. The shear strength, wood failure and 24 h water ab- sorption values were 1.89 MPa, 95% and 62. 24%, respectively, when only l-layer HDPE film was used between every two silane-treated poplar veneers. In addition, the silane treatment led to considerable improvement in thermal stability as proved by higher storage modulus and lagged temperature for tand peak value. Nearly 80% increase in storage modulus at 130 ℃ was acheived and the temperature reaching tan δ peak value increased from 141 ℃ to 180 ℃ when 1-layer HDPE film was used between every two silane-treated veneers.