有机抗菌剂提高塑木复合材料使用寿命

德国Lanxess（朗盛）公司开发出专用于塑木复合材料（WPC）的有机抗菌剂新产品Preventol MPT11，报道称能“显著”降低导致WPC褪色和变色的霉菌和有机微生物的负面作用，因而大幅度提高WPC的使用寿命。     

美国塑木标准综述

分别介绍了美国塑木（RPL）板材和型材的标准和塑木复合材料（WPC）的标准概况。由于塑木型材的断面密度分布的不均匀性，使一般的塑料或木材试验方法不能得到正确的试验结果，于是美国材料试验协会（ASTM）从上世纪90年代初开始研究和制定适合塑木材料特点的标准，先后颁布了7项试验方法和1项塑木产品标准。随着塑木工业的发展，材料中木粉添加量不断增加，超过了50％，在这种情况下，于2004年又分别颁布了塑木复合材料（WPC）的性能试验方法的标准和铺板和护栏的产品标准。另外，美国国际规范协会（ICC）在建筑行业规范中制定了热塑性塑木复合产品的验收标准和铺板跨距等级和护栏体系（护栏和扶手）的验收标准。最后列出了美国塑木标准的现行版本．     

可直接挤出塑木复合材料的新工艺

经过优化的塑木复合材料（WPC）型材挤出新设备可赋予加工企业处理更多特殊配方的能力。     

塑木复合材料专用着色剂

美国俄亥俄州Independance的Ferro公司聚合物添加剂部和着色部新推出塑木复合材料（WPC）用系列着色剂，是该公司为满足增长的WPC市场而开发的专用添加剂之一，其他还有润滑剂和UV（紫外）稳定剂。新系列产品有5种颜色（柚木棕、红杉，风化灰、深灰和红木），不含硬脂酸金属盐，能与大部分高性能WPC相容，除上述5种标准颜色外，Ferro公司还能供应客户指定颜色产品。     

塑木复合材料专用着色剂

美国俄亥俄州Independance的Ferro公司聚合物添加剂部和着色剂部新推出塑木复合材料（WPC）用系列着色剂，是该公司为满足增长的WPC市场而开发的专用添加剂之一，其他还有润滑剂和UV（紫91-）稳定剂。新系列产品有5种颜色（柚木棕、红杉、风化灰、深灰和红木），不含硬脂酸金属盐，能与大部分高性能WPC相容，除上述5种标准颜色外，Ferro公司还能供应客户指定颜色产品。     

新型塑木复合材料加工助剂

据“Modern Plastics Worldwide”,2008,85（1）：25报道,美国俄亥俄州Stow聚合物助剂厂美国Straktol公司（Straktol Co．of America）开发出塑木复合材料（WPC）专用加工助剂牌号TPW709和TPW113,利用新产品独特的润滑和填料浸渍机理,改进木纤维在塑料焙体中的分散性,有助于焙体平衡地通过挤出机头,消除WPC制品缺陷（边缘撕裂）,提高加工产量,并降低WPC挤出过程的转矩和温度。     

Teknor Color公司-包装WPC母料节省成本

美国Teknor Color公司首次推出塑木复合材料（WPC）铺板和类似制品专用含杀菌剂的色母料。可以改善产品外观，延长产品寿命，降低生产成本。     

塑木经氟氧化处理后可涂漆

一般塑料在无氧条件下氟化处理是为了赋予塑料阻隔性，而在氧存在下氟化处理塑木复合材料（WPC）表面后，常用油漆和底漆粘结WPC就象粘接天然木材一样容易和牢同。美国休斯顿的Fluoro-Seal International，L．P公司发现有氧条件下WPC表面氟化处理时也发生氧化，称为氟氧化（fluoro—oxidation）。按ASTM的Cross—hatch粘结试验，未经处理的WPC片材粘结强度为72g/cm^2。而处理过的WPC片材达182g／cm^2。     

德国开发水下切料新技术快速切粒和干燥WPC

由于塑木复合材料（WPC）的吸水性，一般水下切料工艺不能成功用于WPC造粒，德国Xaten的Gala塑料和塑料机械公司开发的“内热工艺”特点为连续进行WPC的水下切料和干燥，即利用挤出WPC粒料本身的热量来更好地完成干燥。这种内热工艺过程中，挤出WPC先在完全充满水的切粒室内切断成粒料，粒料表面被水冷却，防止粒子间彼此粘接，粒子和水混合进入出料管，     

塑木复合材料用超大加料混合器

美国宾夕法尼亚洲Aston的Maguire产品公司推出加料用重量式混合器Maxi Batch WSB．适用加料量大的配混和挤出工艺，也能用于塑木复合材料（WPC）挤出成型超大加料量计量系统。     

木塑复合材料的一步法成型技术与装备研究

介绍了废旧木塑复合材料成型加工的研究进展,就挤出机选型、机头设计、工艺参数等木塑复合材料加工的难点进行了研究与探讨。结合大量的实验与理论计算,对于废旧木塑复合材料的成型提供了可实际工业化生产的技术装备与工艺路线。结果表明:制品的各项性能指标均达到要求,体现了这种加工方法与相关装备良好的应用前景。     

木塑复合材料热解特性

通过热重分析(TGA)和裂解/气质联用(Py-GC/MS)对杨木/高密度聚乙烯(HDPE)木塑复合材料(WPC)进行热解,考察了木粉和聚烯烃塑料热解过程中的相互作用。结果表明:生物质和塑料热解过程中存在明显的协同作用,杨木在较低的温度下即开始发生热解,其提供的自由基参与了聚烯烃热解反应,产生了更多的轻质烃类产物。而聚烯烃分解产生的碳氢化合物向生物质分解产生的自由基提供氢,促进挥发性物质生成,部分抑制了活性自由基进一步聚合结焦,得到了更多的挥发性产物和减少了固体残炭。     

Ternary Biopolymer Based on Wheat Gluten,Whey Protein Concentrate and Montmorillonite

The aim of the research was to obtain biopolymers based on wheat gluten, whey protein concentrate (WPC) and montmorillonite (MON). Ternary biopolymers were formed as heat-induced gels and they were hardened by water evaporation. Adding 7 % of MON and 5 % WPC to gluten caused ca. four times higher values of storage modulus. Increased moduli values with adding MON and WPC to gluten were probably caused by reinforcing effect of MON, which decreased mobility of gluten chains and possible interactions between gluten and whey proteins by disulphide interchange. Increase in gluten protein concentration and addition of WPC and MON caused increase in viscosity measured by dissipation of ultrasound vibrations. Evaporation of water from the gels formed very hard material with high puncture force values. Obtained gels were very plastic and it was easy to form any type of shapes. They could be used to produce biodegradable pottery (e.g. flowerpots) with the mechanical properties similar to non-degradable clay products.     

Procedure effect on the physical and mechanical properties of the extruded wood plastic composites

This article investigates the effect of raw material preparation on the mechanical and physical properties in wood‐plastic composite (WPC) production. Four possible procedures in material preparation to obtain a determined level of wood content are: (i) to use and feed raw materials in the same ratio of the desired composition (single stage), (ii) to use the batch of granules of the same composition (two‐stage), (iii) to add wood to the batch of granules having a lower wood content, (iv) to add polymer to the batch of granules having a higher wood content. The main question then is that, while it is economically attractive to use granules of a fixed wood content in all productions, whether there are noticeable differences in final properties of the products. The examined compositions were 50, 60, and 70 wt% of wood content which are considered as highly filled WPCs and mainly used in the WPC markets. Thus, 12 sets of WPC profiles were manufactured and the processing conditions (temperature, pressure, and outlet velocity) recorded. The flexural properties, impact strength, density, and water uptake were measured. Results revealed that in the production of WPCs with 50 and 70 wt% of wood content, using the WPC granules with the same composition yields better physical and mechanical properties. However, for producing WPC with 60 wt% of wood content, using WPC granules with 70 wt% of wood and adding appropriate amount of polymer exhibit better results. POLYM. COMPOS. 34:1349–1356, 2013. © 2013 Society of Plastics Engineers     

木塑复合材料的胶接技术研究进展

介绍了木塑复合材料的概念与特点,提出了木塑复合材料胶接技术所面临的主要问题,综述了国内外改善木塑复合材料胶接性能的研究现状,总结了胶种优选、表面处理等改善木塑复合材料胶接性能的措施,简述了预测木塑复合材料胶接强度的无损检测手段,展望了木塑复合材料胶接技术研究的发展方向。     

液相体系制备乳清蛋白-低聚异麦芽糖复合物

该文将低聚异麦芽糖(IMO)通过糖基化反应引入乳清浓缩蛋白(WPC),制备WPC-IMO复合物。通过测定WPC-IMO复合物的接枝度确定反应条件。应用响应面分析法对WPC-IMO Maillard反应过程中的各影响因素进行分析,优化各反应条件参数,以获得最大的接枝度。结果表明,在温度90℃,底物配比m(WPC)∶m(IMO)=1∶3.125、pH=9.86、反应时间78.57 min的条件下复合物的接枝度最大,达25.75%。并对该条件进行了验证实验,证实了通过响应面法的预测值和实际值一致。最后,通过SDS-PAGE验证了WPC-IMO Maillard反应的发生。     

木塑复合材料的光降解与光稳定

介绍了国内外木塑复合材料的发展现状,分析了木塑复合材料的光降解机理,指出木塑复合材料的光稳定必须综合考虑木材和塑料两方面的因素,对目前木塑复合材料光稳定的可行途径进行了讨论,并展望了国内外木塑复合材料的发展趋势。     

Comparative study on the properties of wood polymer composites based on different modified soybean oils

The growing awareness for greener and more sustainable technologies has focused the attention of researchers recently for the development of high performance biopolymer-based composites. Wood polymer composites (WPC) based on functionalized epoxidized soybean oil (ESO) and soft wood, Krishnachura (Delonix regia), were prepared by compression molding technique. ESO was functionalized by acrylic acid (AESO), methacrylic acid (MESO), and methacrylic anhydride (MAESO), which were used as matrices in the composite. Wood flour from soft wood was used as reinforcing agent. The fiber/resin ratio was maintained at 40:60. The composites were characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Mechanical testing, limiting oxygen index (LOI), and swelling behavior were checked for the prepared composites. WPC based on methacrylic anhydride exhibited maximum improvement in properties.     

Effect of Fiber Origin,Proportion, and Chemical Composition on the Mechanical and Physical Properties of Wood-Plastic Composites

This study assessed the potential of wood residues as fiber sources for wood-plastic composites (WPC) and examined the impact for intrinsic fiber properties on strength development. Sawmill sawdust, underused wood species, bark, composite panel, and pulp and paper sludge residues were sampled. Fibers were characterized for cellulose content, ash content, and fiber aspect ratio. WPC samples were formed by twin-screw extrusion compounding, followed by injection molding at three fiber proportions. WPC mechanical properties, water uptake, and water swelling increased with increasing fiber proportion, whereas tenacity decreased. WPC made with residues had lower mechanical and physical properties than those made with clean wood, with some exceptions. Kraft sludge produced one of the best WPC formulations in terms of thickness swell, water swelling, tensile strength, and impact energy. Deinking sludge produced the toughest and the most dimensionally stable WPC. Panel industry residues formed roughly similar WPC to those made with clean wood. Bark led to poorest WPC in terms of mechanical properties. High correlation coefficients were found between cellulose content, wood content, and all WPC properties except impact energy. However, the correlations between aspect ratio and the WPC were insignificant.     

木塑制品户外应用中的老化及防护涂覆探讨

木塑复合材料(WPC)是一类涵盖面广、产品种类多、形态结构多样的环保型基础性材料,用WPC制造的木塑制品用于户外,也会因受环境影响而变色、老化、生物或非生物腐蚀等,通过在木塑制品表面涂覆特种功能材料,就能减缓其劣化进程,延长其使用寿命。