麦秸形态对麦秸刨花板性能的影响

研究了麦秸刨花板制造中麦秸刨花形态对板材基本性能的影响。实验结果表明当麦秸刨花采用 70％为 0.34-3cm, 25％小于 0.34cm, 5％其它的情况下,板材的性能达到最佳。     

Evaluation of melamine‐modified urea‐formaldehyde resins as particleboard binders

Particleboards bonded with 6 and 12% melamine‐modified urea‐formaldehyde (UMF) resins were manufactured using two different press temperatures and press times and the mechanical properties, water resistance, and formaldehyde emission (FE) values of boards were measured in comparison to a typical urea‐formaldehyde (UF) resin as control. The formaldehyde/(urea + melamine) (F/(U + M)) mole ratio of UMF resins and F/U mole ratio of UF resins were 1.05, 1.15, and 1.25 that encompass the current industrial values near 1.15. UMF resins exhibited better physical properties, higher water resistance, and lower FE values of boards than UF resin control for all F/(U + M) mole ratios tested. Therefore, addition of melamine at these levels can provide lower FE and maintain the physical properties of boards. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Examination of selected synthesis parameters for wood adhesive‐type urea–formaldehyde resins by 13C NMR spectroscopy. III

The varying polymer structures of wood adhesive‐type urea–formaldehyde resins resulting from different formaldehyde/first urea (F/U₁) mole ratios used in the first step of resin manufacture were investigated using ¹³C. As the F/U₁ mole ratio decreased progressively from 2.40 to 2.10 and to 1.80, the viscosity increase due to polymerization during resin synthesis became faster and resulted in decreasing side‐chain branches and increasing free urea amide groups in the resin structure. The resultant UF resins, with the second urea added to an overall F/(U₁ + U₂) of 1.15, showed viscosity decreases when heated with stirring or allowed to stand at room temperature that were also characteristic with the F/U₁ mole ratios used in resin synthesis. The formaldehyde emission levels of particleboards bonded with the freshly made UF resins showed relatively small but similarly characteristic variations. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2800–2814, 2001     

浅析提高桉木刨花板质量的措施

在桉木刨花板生产中，桉树皮对刨花板质量的影响，成为制约大量使用桉木生产刨花板的瓶颈。本文针对桉树皮对刨花板质量的影响，从工艺设备配置上提出应对措施。     

人造板断面密度的研究现状与方向

人造板的物理力学性能与板材的断面密度有着密切关系,本文系统介绍在人造板断面密度的理论和检测技术方面的研究进展,并提出了未来的研究方向.     

异氰酸酯/脲醛树脂复合胶黏制备高强芦苇刨花板及性能研究

目的 为提升芦苇原料单元胶合性能、提高芦苇资源材料化利用率。方法 文中以异氰酸酯/脲醛树脂复合胶黏剂制备芦苇刨花板,并采用三因素三水平的正交试验,研究施胶量、热压时间和温度对板材静曲强度(MOR)、弹性模量(MOE)、内结合强度(IB)和吸水厚度膨胀率(TS)的影响。结果 研究发现,当异氰酸酯占复合胶黏剂质量的11.6%时,芦苇刨花板的较优热压温度、热压时间、施胶量分别为160 ℃、240 s、12%。以该复合胶黏剂制备的芦苇刨花板的MOR、MOE、IB、2 h TS和24 h TS分别为33.68 MPa、3 292 MPa、1.05 MPa、3.64%和9.45%,满足GB/T 4897—2015中在干燥状态下使用的重载型刨花板(6~13 mm)性能要求。结论 文中的研究拓宽了芦苇资源代替木材在包装材料领域的工业化利用。     

分级式铺装机在刨花板生产中的应用

详细介绍刨花板生产用分级式铺装机的工作原理及其使用注意事项。     

改性豆基胶粘剂在秸秆人造板中的应用

目前，农作物秸秆人造板所使用的胶粘剂大多为异氰酸酯型，虽其粘接性能优良，但有价格很责以及铺装板坯初粘性低等缺陷。近年来，国外对利用豆基胶粘剂制造环保型秸秆人造板的研究日渐增多。本文对此进行综合介绍，并根据我国国情展望了中国农作物秸秆人造板产品的发展前景。     

无机麦秸碎料板制备与性能研究

以麦秸碎料和无机胶黏剂为主要原料,通过冷压成型工艺制备了无机麦秸碎料板,研究了麦秸碎料添加量对无机麦秸碎料板物理力学性能的影响,并通过X射线衍射仪、热重分析仪、差示扫描量热仪及扫描电镜等分析仪器分析了麦秸碎料添加量对无机麦秸碎料板性能影响机理.结果表明:随着胶草比增加,板坯养护期间,麦秸碎料对无机成分水化反应的“隔阻”效应减弱,无机麦秸碎料板坯中无机成分水化反应速度加快,反应更完全,结晶更完整,无机胶粘剂生成量增加,麦秸碎料与无机胶粘剂接合界面性能变好,无机麦秸碎料板的内结合强度(IB)逐渐增大,24 h吸水厚度膨胀率(TS)逐渐减小,静曲强度(MOR)和弹性模量(MOE)先增大后减小,板材热稳定性增加.综合考虑,优化的胶草比为2.1.     

Some Properties of Composite Panels Manufactured from Eastern Redcedar (Juniperus virginiana L.) Using Modified Starch as a Green Binder

The objective of this study was to evaluate basic properties of particleboard panels manufactured from Eastern redcedar (Juniperus virginiana L.) using modified starch and low percent of urea formaldehyde as binder. Experimental panels in the form of three-layer configuration were made from the raw material at two density levels. Bending characteristics, namely, modulus of elasticity (MOE), modulus of rupture (MOR), and internal bond strength (IB) in addition to dimensional stability and surface roughness of the samples were determined. The highest MOE and MOR values of the samples with 0.80 g/cm³ density level were found as 2344.32 and 12.14 MPa, respectively. Both bending and IB values of the samples were comparable to those of commercially manufactured panels from other species. It appears that dimensional stability of the panels needs to be enhanced. Based on the findings in this work, modified starch could have potential as green binder in particleboard panels manufactured from Eastern redcedar without having substantial adverse influence on their properties.