发展是硬道理环保是大问题--关于一次性塑料包装材料与环境问题的思考

论述了塑料包装材料持续，稳步的发展和被广泛应用是时代进步的表征，但其废弃物也对环境带来严重的负面影响。重点就当前国内外对一次性塑料包装材料与环境问题所采取的举措作了介绍和分析，并提出了看法。     

塑料包装与环境无害化

扼要评述了塑料包装材料面临环境问题的严峻挑战，并简单评介了塑料包装环境无害化的几种主要处理方法，最后提出加强塑料包装废弃物的综合治理，采取减量，回收，降解等“防与治”相结合的方针对及加强宏观引导，加快立法，增强全民环境和资源意识，可作为我国塑料包装环境无害化的重要对策和措施。     

塑料包装薄膜材料

超市货架上琳琅满目的商品让人眼花缭乱，目不暇接，这在很大程度上得益于塑料包装材料和技术的不断发展，在塑料包装中，又以薄膜材料的发展最为迅速，所占的市场份额也最大。[编者按]     

塑料包装材料现状与发展趋势

对2003年塑科包装行业回顾．对国内外塑料行业发展趋势的探讨。     

浅谈我国塑料包装材料的发展趋势

概述我国塑料包装材料的发展动向；并对我国塑料包装重点产品的发展方向进行了探讨；最后提出发展的对策和措施。     

塑料包装废弃物与环境污染

论述了当前塑料包装材料发展中的机遇和挑战,对我国塑料包装废弃物与环境问题的产生、现状以及正确对待塑料包装废弃物与环境问题进行了分析评述,并提出了主要治理对策和措施.     

高阻隔性塑料包装材料的研究进展

概述了我国阻隔性塑料包装材料的现况和发展，重点介绍了PVDC，EVOH，PEN，PA等几种阻隔塑料的开发情况，并探讨其未来发展趋势。     

塑料包装材料新品种不断涌现

<正>随着塑料包装在包装行业占有比例越来越大,塑料包装材料的新种类也在不断涌现,目前,就其生产规模而论,我国的塑料包装材料的生产,已经远远超过了西方发达国家及日本,跃居世界第一位,其发展速度十分惊人。新型聚酯包装独领风骚。在塑料包材中最引人注目的是聚萘二甲酸乙二醇酯的应用,这是一种新型聚酯包装材料,具有良好的阻气性,防紫外线性和耐热性。     

国内外塑料包装材料回收法律体系概况

介绍了中国和欧、美、日等发达国家塑料包装材料回收立法现状,其中包括回收塑料用于食品包装的概况。塑料包装工业要实现可持续发展,当务之急是加快包装材料回收立法,尤其是食品塑料包装回收立法工作。     

电子塑封材料研究进展

简述了电子塑封材料的特点.概括了封装材料常用的酚醛树脂(PF)、苯并噁嗪树脂(BOZ)、氰酸酯树脂(CE)、环氧树脂(EP)、聚酰亚胺(PI)、双马来酰亚胺(BMI)、聚苯醚(PPO)等几种树脂基体的性能.并根据现阶段电子封装材料的发展要求,重点叙述SiO<,2>、Si,N<,4>、Al<,2>O<,3>,及AIN等填...     

复合塑料软包装材料健康发展的机遇和挑战

复合塑料软包装由2层或2层以上材料复合在一起形成的复合材料做成的包装,广泛用于食品、日化、医药、工业、农业等多个领域,从源头到加工过程到末端处置都面临着由内而外的挑战和调整。随着全球进入低碳可持续时代,单材化及单材化赋能技术、新型油墨及环保型胶黏剂技术共同构建了构建低碳零碳负碳技术创新体系,推动塑料软包装行业进入到了低碳、循环可持续的高质量发展期。     

NOx对白酒塑料包装制品性能的影响研究

基于白酒塑料包装制品在存储过程中,由于燃油装载车辆排放尾气中的NOx而导致出现气熏黄变现象,通过建造人工环境,研究了不同种类的白酒塑料包装制品在高浓度NOx环境下的黄变、抗腐蚀性和热稳定性等的变化情况,以期确保高端白酒包装选材在正常使用、储存过程中不失效,避免防伪方面出现漏洞.结果表明,在超高浓度NOx(2480 mg...     

塑料软包装复合材料绿色发展思考

综述了塑料软包装复合材料市场发展和应用现状．讨论了目前显露出来的几个问题,并探讨其绿色发展的路径。     

用LCA法评价纸和塑料包装对环境的影响

采用国际通用的生命周期分析(LCA)方法．评价了纸和塑料包装对环境的影响。结果表明．不论从能源的消耗．对环境的污染．还是从产品再生循环利用率和可持续发展来看．塑料包装制品都优于纸制品。     

塑料衍生碳材料用于超级电容器的研究现状

塑料制品的过度使用,导致了严重的环境问题。将废旧塑料回收并转化为高附加值的碳材料并用于超级电容器等储能装置有着重要的意义,能够有效地降低环境污染并节约能源。本文首先对超级电容器的应用情况和塑料的使用以及回收处理现状进行了简单叙述,介绍了常见的废弃塑料处理方法、超级电容器的储能特点以及利用废弃塑料制备超级电容器碳材料的潜在价值;接着介绍了多孔碳电极材料的制备方法,对不同的制备方法的具体要求及其优缺点进行了简单分析;随后介绍了几种生活中常见的塑料,按照这些塑料的种类,分别对这些常见塑料回收用作超级电容器碳材料的研究现状进行了详细概述;最后对目前的研究现状进行总结,并对未来的研究方向进行展望。将废弃塑料回收并转化为超级电容器用活性碳材料,是一种新型的废弃塑料回收再利用的有效手段,能够有效地解决白色污染问题。     

Recycling of polymers from plastic packaging materials using the dissolution–reprecipitation technique

In this work, results are presented on the application of the dissolution/reprecipitation technique in the recycling of polymers from waste plastic packaging materials used in food, pharmaceuticals and detergents. Initially, the type of polymer in each packaging was identified using FT-IR. Furthermore, experimental conditions of the recycling process (including type of solvent/non-solvent, initial polymer concentration and dissolution temperature) were optimized using model polymers. The dissolution/reprecipitation technique was applied in the recycling of a number of plastic materials based on polyethylene (LDPE and HDPE), polypropylene, polystyrene, poly(ethylene terephthalate) and poly(vinyl chloride). The recovery of the polymer was measured and possible structural changes during the recycling procedure were assessed by FT-IR spectroscopy. Potential recycling-based degradation of the polymer was further investigated by measuring the thermal properties (melting point, crystallinity and glass transition temperature), of the polymer before and after recycling, using DSC, their molecular properties (average molecular weight) using viscosimetry, as well as their mechanical tensile properties. High recoveries were recorded in most samples with the properties of the recycled grades not substantially different from the original materials. However, a slight degradation was observed in a few samples. It seems that this method could be beneficial in waste packaging recycling program.     

Thermal and catalytic pyrolysis of a synthetic mixture representative of packaging plastics residue

A synthetic mixture of real waste packaging plastics representative of the residue from a material recovery facility (plasmix) was submitted to thermal and catalytic pyrolysis. Preliminary thermogravimetry experiments coupled with Fourier transform infrared spectroscopy were performed to evaluate the effects of the catalysts on the polymers’ degradation temperatures and to determine the main compounds produced during pyrolysis. The thermal and catalytic experiments were conducted at 370°C, 450°C and 650°C using a bench scale reactor. The oil, gas, and char yields were analyzed and the compositions of the reaction products were compared. The primary aim of this study was to understand the effects of zeolitic hydrogen ultra stable zeolite Y (HUSY) and hydrogen zeolite socony mobil-5 (HZSM5) catalysts with high silica content on the pyrolysis process and the products’ quality. Thermogravimetry showed that HUSY significantly reduces the degradation temperature of all the polymers—particularly the polyolefines. HZSM5 had a significant effect on the degradation of polyethylene due to its smaller pore size. Mass balance showed that oil is always the main product of pyrolysis, regardless of the process conditions. However, all pyrolysis runs performed at 370°C were incomplete. The use of either zeolites resulted in a decrease in the heavy oil fraction and the prevention of wax formation. HUSY has the best performance in terms of the total monoaromatic yield (29 wt-% at 450°C), while HZSM5 promoted the production of gases (41 wt-% at 650°C). Plasmix is a potential input material for pyrolysis that is positively affected by the presence of the two tested zeolites. A more effective separation of polyethylene terephthalate during the selection process could lead to higher quality pyrolysis products.     

塑料食品包装材料化学物迁移的数值模拟

基于有限差分方法数值模拟了塑料食品包装材料化学物向食品（模拟物）的迁移及迁移物在食品内的不稳定性。结果表明,扩散系数DP决定了迁移的动力学过程,分配系数KP,F表征平衡时化学物在包装材料和食品内的浓度比值,平衡时食品内的化学物浓度随化学物在包装材料内的初始浓度Cin的增加而增加。对于多层复合包装,阻隔层可显著减缓污染物层内化学物向食品的迁移,从而达到保证食品安全的目的,阻隔层厚度LR影响阻隔功效。化学迁移物在食品内存在不稳定现象,这将导致实验结果低估其向食品的迁移。