新型PET瓶阻隔性树脂

美国Valspar公司推出新系列阻隔剂／吸氧剂材脂Val OR。     

改进PET阻隔性的几种方法

PET树脂是由对苯二甲酸与乙二醇缩聚而成,性能优异,在食品、饮料、化工、医药、化妆品等行业包装材料中所占比例呈直线上升趋势,在全球饮料包装市场中的比例占到各类材料的37％。     

欧洲阻隔性PET容器需求快增

德国从事专业包装市场研究的Schunwald咨询公司在其2008年6月中旬发布的研究报告中称,今后5年欧洲对阻隔性聚对苯二甲酸乙二酯(PET)容器的需求每年将以9%的速度增长,将从2007年的29亿个提高到2012年的45亿个。据称,阻隔性PET瓶仅占欧洲PET瓶市场的2.5%,但阻隔性PET瓶需求的增速     

欧洲阻隔性PET容器需求快速增长

据Plast Techol,2008,（2）：18报导,今后5年,欧洲对阻隔性聚对苯二甲酸乙二醇（PET）容器的需求每年将以9％的速度增长,将从2007年的29亿个提高到2012年的45亿个。     

阻隔性包装薄膜概述

伴随着食品种类的日益增多,用于食品的包装技术也越来越丰富。为了防止食品变质,以及延长货架期,近年来,阻隔性包装薄膜得到了快速发展,其在包装行业中的作用举足轻重。为了帮助大家更详尽地了解阻隔性包装薄膜的特点和加工技术的进展情况,     

提高PET瓶阻隔性的新涂层技术

据“European Plastics News，2006，33（4）：35”报道，南非科学和工业研究协会（CSIR）的塑料瓶涂层新技术Oxyplete已取得专利，该技术显著提高聚对苯二甲酸乙二醇酯（PET）瓶阻隔性。     

吸氧型阻隔性包装薄膜

伴随着食品种类的日益增多．用于食品的包装技术也越来越丰富。为了防止食品变质．以及延长货架期,近年来．阻隔性包装薄膜得到了快速发展．其在包装行业中的作用举足轻重。为了帮助大家更详尽地了解阻隔性包装薄膜的特点和加工技术的进展情况．本刊将以连载的方式,对阻隔性包装薄膜做一详尽介绍。     

PET瓶用新型防脱层阻隔性树脂

美国明尼苏达州Minneapolis（阿波利斯市）的Valspar公司在2006年2月举办的美国Nova—Pack会议上推出阻隔剂／吸氧剂新系列树脂Valor。Nova—Pack会议是由Schotland业务研究公司主办的国际食品和饮料包装用PET会议。2005年8月份第一次报道了Valor树脂，作为多层PET瓶的铝化阻隔剂／吸氧剂，也可与PET共混后直接加工成型相对比较透明的单层瓶和容器。     

PVDC涂布型阻隔性包装薄膜

伴随着食品种类的日益增多,用于食品的包装技术也越来越丰富,为了防止食品变质,以及延长货架期,近年来,阻隔性包装薄膜得到了快速发展,其在包装行业中的作用举足轻重,为了帮助大家更详尽地了解阻隔性包装薄膜的特点和加工技术的进展情况。     

挤出复合阻隔性包装薄膜生产工艺

编者按：伴随着食品种类的日益增多,精于食品的包装技术也越来越丰富,为了防止食品变质．以及延长货架期,近年来,阻隔性包装薄膜得到了快速发展,其在包装行业中的作用举足轻重,为了帮助大家更详尽地了解阻隔性包装薄膜的特点和加工技术的进展情况,本刊将以连载的方式,对阻隔性包装薄膜做一详尽介绍。     

Thermal degradation characteristic of Tetra Pak panel boards under inert atmosphere

hermal degradation characteristics of Tetra Pak panel boards (TPPB) can be useful to improve usage of such panels as an alternative to wood-based products such as plywood, fiberboard, and particleboard. In the study, samples from the TPBBs manufactured from waste Tetra Pak packages (WTPP) were heated in a nitrogen atmosphere at different heating rates (10, 15 and 20 °C/min) using a thermal analysis system. The Coats-Redfern kinetic model was applied to calculate kinetic parameters. The degradation rate equations were then established. In addition, the kinetic compensation effect (KCE) was used to correlate the pre-exponential factor (k _o ) with activation energy (E _a ) and the existence of the KCE was accepted. TG-FT/IR analyses were applied to the TPPB degradation and then the FT-IR stack plot was used to analyze gas products (CO₂, CH₄, HCOOH, and CH₃OH). Infrared vibrational frequencies and the micro, crystal structure of the TPPBs were investigated by Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM) and X-Ray diffraction analysis (XRD), respectively.     

不同工艺制备利乐粉/HDPE阻燃木塑复合材料的研究

研究了不同工艺对阻燃利乐粉/高密度聚乙烯(HDPE)复合材料的阻燃性能和力学性能影响。实验结果表明:热压法制备利乐粉/HDPE阻燃木塑复合材料的最佳工艺条件是加压时间15 min,温度为160℃,压力为10MPa,利用最佳工艺条件制成的样品,氧指数可达28.31%,弯曲强度为44.17 MPa,拉伸强度为16.98 MPa;对比热压法和注塑法,注塑法制备的阻燃木塑复合材料具有更良好的力学性能和阻燃性能,且注塑法制备的复合材料燃烧残余物的炭层更致密和稳定;SEM和FTIR分析表明挤出注塑法和热压法制备的阻燃木塑复合材料燃烧残余物的红外图谱的峰与设计目标产物的特征峰一致,材料具有阻燃性。     

阻隔PET的合成及性能研究

聚对苯二甲酸乙二醇酯(PET)因其环保性能和低成本在食品包装领域应用越来越大,随着食品包装市场的不断升级,对包装材料也提出了更高的需求.近年,特别是在高阻隔包装材料领域需求量日益增多.PET本身具备一定阻隔性能属于中等阻隔材料,但在高阻隔领域其性能显得不足.为进一步提高PET的阻隔性能,同时保持其力学性能不受影响,选用反式富马酸为改性单体,通过利用其基团柔性、憎水性和不饱和键配合催化母粒后氧化消耗氧气,获得了高阻隔改性共聚酯,提升了PET阻隔能力和保证了其冲击强度等性能.力学性能测试表明:添加少量的富马酸可以提升PET冲击强度,但富马酸含量增加后冲击强度有所下降,拉伸强度随着富马酸含量增加反而降低.共聚酯的水蒸汽透过量和氧气透过率均较PET有较大提升,改性后能够适用于有高阻隔要求的食品包装领域.     

Improving gas barrier of PET by blending with aromatic polyamides

Improvement of gas-barrier properties of poly(ethylene terephthalate) (PET) by blending with an aromatic polyamide, either poly(m-xylylene adipamide) (MXD6) or a copolyamide based on MXD6 in which 12 mol% adipamide was replaced with isophthalamide (MXD6-12I), was studied. Incorporating a small amount of sodium 5-sulfoisophthalate into the PET matrix compatibilized the blends and reduced the polyamide domain size to 100-300 nm. Thermal analysis showed that the polyamides had a nucleating effect on PET crystallization, whereas crystallization of the polyamides was inhibited especially in compatibilized blends. Without orientation, blending with 10 wt% MXD6 or MXD6-12I reduced oxygen permeability of PET by a factor of about 0.8 (P/P_PET) when measured at 43% relative humidity (RH), in accordance with the Maxwell model prediction. However, after biaxial orientation, oxygen permeability of blends with 10 wt% MXD6 was reduced by 0.3 at 43% RH, and permeability of blends with 10 wt% MXD6-12I was reduced by 0.4. Even at 85% RH, oxygen permeability was reduced by 0.4 and 0.6 for blends with MXD6 and MXD6-12I, respectively. Blending with an aromatic polyamide was even more effective in reducing carbon dioxide permeability of oriented PET. Transformation of spherical polyamide domains into platelets of high aspect ratio increased tortuosity of the diffusion pathway. The platelet aspect ratio predicted by the Nielsen model was confirmed by atomic force microscopy. Higher aspect ratio of MXD6 domains was ascribed to a lower T_g compared to MXD6-12I. Similar reduction in oxygen permeability was achieved in bottle walls blown from PET blends with MXD6 or MXD6-12I.     

Flame retardancy and mechanical properties of thermal plastic composite panels made from Tetra Pak waste and high‐density polyethylene

In this article, flame retardancy thermoplastic composites were developed by extrusion followed by injection molding using recycled Tetra Pak packaging material (TPP) waste and high‐density polyethylene (HDPE) with addition of ammonium polyphosphate (APP) and melamine (MEL) as intumescent flame retardants (FRs). The influences of intumescent FRs on the properties of composites were investigated. FRs loading positively affected flame retardancy, but deteriorated mechanical properties as the loading rate was more than 30 wt%. Considering the fire retardancy and tensile strength (TS), the content of FR should not be more than 30 wt%. When the ratio of APP/MEL was less than 3/1, both combustion behavior and TS of the composites were improved with the increased FR loading, which was supported and verified by the analysis of FTIR spectra and SEM images. The thermogravimetric analysis results indicated that the incorporation APP and/or APP and MEL into composites as FRs into composites promoted char formation and correspondingly improved the thermal stability. The synergistic effect of APP and MEL in the intumescent FR system further improved the flame retardancy of the composites. POLYM. COMPOS., 37:1797–1804, 2016. © 2014 Society of Plastics Engineers