乙烯基乳液-异氰酸酯木材胶粘剂的研究

介绍了一种乙烯基乳液－异氰酸酯木材胶粘剂，探讨了配方中主要成分对胶粘剂性能的影响。该胶具有良好的胶接性、耐水性。     

乳白胶木材胶粘剂的制备试验

本文介绍了木材粘合常用的两种合成树脂乳白胶和脲醛树脂的制备配方和工艺,叙述了用正交表进行乳白胶木材胶粘剂配方设计的试验情况。试验结果表明:(1)所述8个乳白胶胶粘剂配方粘合木材的剪切强度均大于1.96MPa,成本比较低廉;(2)所选定的增塑剂DBP用量对粘合强度影响特别显著,应当重视乳白胶胶粘剂中增塑剂总含量的选择;(3)根据正交表的方差分析确定胶粘剂的最优配方是A_2B_1C_1D_1。     

木材胶粘剂的研究进展

介绍了三醛胶和白乳胶的改性研究进展,综述了近年来出现的新胶种以及可再生资源在胶粘剂中的利用,并对木材胶粘剂的发展进行了展望.     

变性淀粉接枝共混交联型无醛胶粘剂的制备

针对目前木材胶粘剂中甲醛残留量大、淀粉胶耐水性及强度差的问题,将玉米淀粉经变性、活化后与酰胺基接枝,并引入环氧氯丙烷进行交联,研制出适用于木材加工及人造板工业的环保型无醛胶粘剂。     

木材工业胶黏剂的应用及发展趋势

随着木材工业的不断发展,木材工业胶黏剂的应用范围也在不停地扩增,种类日趋增加.阐述木材工业胶黏剂的起源,并对各种胶黏剂类型及其应用做出了大概的分析,总结了各类木材胶黏剂的优缺点并提出了相应的改进方案.根据相关行业的要求,对木材工业胶粘剂的发展趋势进行了相应的预测,期望能够为其使用和发展提供借鉴.     

大豆基木材胶粘剂的研究进展

综述了大豆基木材胶粘剂的应用原理、历史和研究进展,重点介绍了豆胶的新型交联体系,指出了豆胶存在的问题.     

本期特约专栏主持人——顾继友

<正>主持人语:木质胶接材料与制品已经成为木质材料与制品的主体,故此胶粘剂和胶接技术在木材加工业占有非常重要地位,木质胶接材料质量的提高和新产品的开发都离不开胶粘剂和胶接技术的进步。着眼于木质材料和制品的发展趋势,在把握木材胶粘剂的低成本化和环保化特点的前提下,从我国木材胶粘剂使用现状、急需解决的关键技术问题和未来发展的角度,介绍木材加工业胶粘剂的应用、存在的问题和未来发展趋势,主要阐述醛类胶粘剂、     

改性PVB木材胶粘剂的研制

采用种子乳液聚合法制备聚丙烯酸酯乳液,再与松香改性PVB乳液混合制成复配木材胶,讨论了改性PVB乳液、保护胶体聚乙烯醇、乳化剂和引发剂的用量,以及丙烯酸酯类单体的配比、搅拌速度和反应温度等因素对胶粘剂性能的影响,得出了生产木材胶粘剂的最佳工艺。该胶粘剂具有水溶性好、初粘力大、粘接强度高、固化时间短等优点,显现出广阔的应用前景。     

我国木材胶粘剂发展概况

综述中国木材胶粘剂概况．报告了脲醛树脂、酚醛树脂、三聚氰胺－甲醛树脂、单宁胶、本素胶、木材的本体聚合等胶粘剂与粘合技术的改进，并提出有关建议。     

特种胶粘剂的研究进展

介绍了在特殊环境下具有特殊粘接效果的特种胶粘剂(包括耐高温胶粘剂、耐低温胶粘剂、密封胶、医用胶、真空胶、耐碱胶和点焊胶等)的研究进展和应用现状,并对特种胶粘剂的发展进行了展望。     

木质素在人造板胶黏剂中的应用

综述了木质素在酚醛树脂、脲醛树脂、三聚氰胺甲醛树脂3种人造板胶黏剂中的应用进展，指出了利用无毒、稳定、价廉、可再生的木质素代替不可再生且有毒的苯酚、甲醛制取工业用人造板胶黏剂是木材用胶黏剂领域的重要研究方向。     

我国木材工业用胶粘剂的现状、存在问题及对策

本文介绍了脲醛树脂胶粘剂、酚醛树脂胶粘剂、三聚氰胺甲醛树脂胶粘剂、聚醋酸乙烯乳液胶粘剂、聚氨酯胶粘剂、热熔胶粘剂等木材工业用胶粘剂的现状和研究进展。分析了目前木材工业用胶粘剂存在的问题,初步提出了解决问题的对策。     

Mussel adhesive protein as an environmentally-friendly harmless wood furniture adhesive

Recent adhesive technologies have focused on the development of high-quality and eco-friendly adhesives. Thus, there is a gradual shift from the currently used chemical-based adhesives toward harmless adhesives with improved quality and performance. Here, we evaluated the potential use of bacteria-produced recombinant mussel adhesive protein (MAP) as a harmless wood furniture adhesive. We formulated a MAP wood adhesive as an inclusion body type for economical preparation, and we confirmed its harmlessness through the non-detection of volatile organic compounds and heavy metals. The formulated MAP showed sufficiently strong bulk adhesive strength for the dried gluing of wood adherends. We also found that the formulated MAP wood adhesive exhibits robust adhesion in various environmental conditions, including open assembly times, incubation times, temperatures, and humidity levels. In summary, the developed recombinant MAP could be successfully used as a promising environmentally-friendly, harmless wood furniture adhesive.     

工业木质素在木材胶粘剂中应用的研究进展

工业木质素应用于木材胶粘剂的研究历史很长,但目前仍停留在小试或中试阶段,并没有工业化生产。结合木质素的基本结构和化学改性,综述了其应用于酚醛树脂、脲醛树脂、三聚氰氨甲醛树脂和聚氨酯胶粘剂等常用木材胶粘剂及环保木材胶粘剂中的现状。指出了工业木质素应用于木材胶粘剂未来研究的方向。引用文献26篇。     

聚氨酯胶黏剂

综述了聚氨酯胶黏剂的特性和种类,以及国内聚氨酯胶黏剂研究现状;概述了近年来国内外聚氨酯胶黏剂研究和应用进展,重点介绍了鞋用聚氨酯胶黏剂、汽车用聚氨酯胶黏剂、包装用聚氨酯胶黏剂、建筑用聚氨酯胶黏剂以及木材用聚氨酯胶黏剂等的研究进展,并对其进行了分析,结合实际情况对今后聚氨酯胶黏剂的发展方向做出了展望,指出聚氨酯胶黏剂在蒸煮袋复合薄膜及水性聚氨酯胶黏剂和反应热熔胶方面的实际需求。     

木材用聚氨酯胶黏剂的研究进展

聚氨酯胶黏剂由于具有无甲醛,施胶量少,胶接强度高等众多优点,使其在木材工业中的使用量逐步增加.但由于价格因素,聚氨酯胶黏剂在木材用胶黏剂中所占的比例仍然较小.研究聚氨酯胶黏剂与木材的胶接机理是从原理入手,掌握聚氨酯胶黏剂的胶接特点,用最少的原料来达到最好的胶接效果,以希望降低使用价格,扩大应用范围.简述聚氨酯胶黏剂的优点,开发和改性研究的基本思路,重点综述了国内外聚氨酯胶黏剂与木材胶接机理的研究进展.     

Synthesis and characterization of lignin-polyurethane based wood adhesive

The present work aims to evaluate the influence of addition of kraft lignin in moisture curing polyurethane (PU) based wood adhesives. The mechanical, thermal properties and chemical structure of the adhesive were studied. The lignin-PU adhesives were obtained by replacing 1%, 3% and 5% of polypropylene glycol (PPG) by Kraft lignin and further reacted with monomeric diphenylmethanediisocyanate (MDI). The aliphatic hydroxyl level of lignin was not taken into consideration in the stoichiometry, in order to find out effect on % free NCO of the final product. The chemical structure of the synthesized lignin-PU adhesives were analyzed by Fourier transform infrared spectroscopy (FTIR). The lap shear strength of the adhesives was tested by bonding canarium wood substrates. The results illustrated that by increasing the weight % of lignin in such lignin-PU adhesives, a decrease in the free isocyanate content, leading to slower setting time but higher shear strength values, were observed. Similarly, the thermal properties of lignin-PU adhesive were also studied, showing an increase in glass transition temperature (Tg) with increase in lignin content.     

木材用单组分湿固化聚氨酯胶粘剂的合成

以多亚甲基多苯基多异氰酸酯(PAPI)、聚丙二醇(PPG-N210)和催化剂2,2'-二吗啉二乙基醚(DMDEE)为主要原料合成了一种木材用单组分湿固化聚氨酯胶粘剂,分析了NCO含量、催化剂用量、扩链系数对胶粘剂性能的影响,并与国内外木材用胶粘剂进行了比较。结果表明,NCO质量分数为12.3%、催化剂用量为0.1%、扩链系数为0.2,制得的胶粘剂室温固化且固化速度快,粘接性能较好,适合于木材的粘接。     

Adhesive properties of water-washed cottonseed meal on four types of wood

The interest in natural product-based wood adhesives has been steadily increasing due to the environmental and sustainable concerns of petroleum-based adhesives. In this work, we reported our research on the utilization of water-washed cottonseed meal (WCM) as wood adhesives. The adhesive strength and water resistance of WCM adhesive preparations on poplar, Douglas fir, walnut, and white oak wood veneers were tested with press temperatures of 80, 100, and 130 °C. Our data indicated that raising the hot press temperature from 80 to 100–130 °C greatly increased the bonding strength and water resistance of the WCM adhesives. The general trend of the adhesive strength of WCM on the four wood species was Douglas fir > poplar ≈ white oak > walnut. The rough surface of Douglas fir with tipping features could enhance the mechanical interlocking between the wood fibers and adhesive slurry, contributing to the high adhesive strength. The dimensional swelling of the bonded wood pairs due to water soaking was in the order: thickness > width (i.e. perpendicular to the wood grain) > length (i.e. parallel to the wood grain). The greatest dimensional changes were observed in Douglas fir specimens. However, the highest decrease in adhesive strength by water soaking was with poplar wood specimens. These observations suggested that the wood dimensional changes were not dominant factors on water weakening the bonding strength of these wood pairs.     

木材胶粘剂的应用现状及发展趋势

主要介绍了木材胶粘剂的发展历史及目前我国主要木材胶粘剂的品种、应用范围、优缺点,并分析了木材胶粘剂未来的发展趋势。