一种粘接聚烯烃(PP、PE)等难粘塑料的新材料

聚烯烃塑料聚丙烯 (PP)和聚乙烯 (PE) ,具有机械强度高 ,化学稳定性和耐热性能优良 ,价格低廉等特点 ,在各个工业领域、交通运输、建筑装潢和民用方面有十分广泛的用途 ,是目前世界上产量最大的合成树脂品种。由于该类材料化学结构惰性 ,高结晶度 ,决定了此类塑料制品的低表面能、非极性和弱界面层特性 ,很难用胶粘剂按常规的方法自粘和互粘 ,成为塑料制造业的一大难题。解决难粘材料的粘接技术的瓶颈 ,是近代科研工作一项热点课题。科研工作者通过长期的研究 ,在应用材料表面处理方法来解决粘接技术方面已取得很大进展 ,如物理处理法、化…     

国内外化工新材料产业发展现状与趋势

化工新材料是新材料产业的主要组成部分 ,是化学工业中最具活力和发展潜力的新领域。目前 ,化工新材料主要包括工程塑料及其合金、功能高分子材料、有机硅、有机氟、特种纤维、复合材料、微电子化工材料、纳米化工材料、特种橡胶、聚氨酯 ,高性能聚烯烃 ,特种涂料、特种胶粘剂、特种助剂等十多个大类品种。1　国外化工新材料产业发展现状综观当今世界化工新材料产业发展现状 ,主要呈现以下特点 :一是美国、欧洲、日本等少数工业发达国家仍然是化工新材料的主要产销国 ,并垄断了先进的生产技术 ;二是主要跨国公司正在实施新一轮扩张计划 ,化…     

胶粘剂工业概况及技术进展

胶粘剂工业概况及技术进展蔡永源（天津市合成材料工业研究所）一、前言随着国外石油化工和合成材料工业的飞快发展，目前国外胶粘剂工业及其在各个领域的应用也越来越广泛。据报导，１９９２年世界胶粘剂销售额为１６３亿美元，其中北美和欧洲约占７５％，预计至１９９７...     

波士胶携智能胶粘剂解决方案亮相第24届生活用纸国际科技展览及会议(CIDPEX)

正作为全球领先的工业制造、建筑和零售市场胶粘剂专家,Bostik携其智能胶粘剂技术和产品亮相于3月22~24日在武汉国际博览中心举行的2017年第24届生活用纸国际科技展览及会议(CIDPEX)。此次CIDPEX展会上,波士胶呈现了两个互动式的智能胶粘剂展台,带来前所未有的全新观展体验。其中一个是全球首款高性能聚烯烃橡筋胶Brilliance~(TM)。当使用Brilliance~(TM)时,生产商不用纠结在高性能应用和实际操作应变中做出两     

胶粘技术在仪器仪表中的应用

在合成高分子材料中,有机合成胶粘剂(以下简称胶粘剂)是继塑料、纤维、橡胶、涂料之后出现的一类新型合成高分子材料。胶粘剂(又称粘合剂、粘接剂,简称胶)是能把两种物件连接在一起,并在结合处具有一定强度的物质。粘接是借用胶粘剂实现连接的一种新的连接方法;粘接技术是用胶粘剂,采用适当的接头形式和合理的粘接工艺,以达到粘接要求的技术。本文将结合胶粘技术在仪表材料方面的应用,简单介绍一些有关胶粘剂,胶接工艺及仪表材料常用的几种粘接和胶粘剂。在仪表工业中采用胶接技术比其他部门更能发挥其作用。胶粘剂具有优良的粘接性能,它比铆接、焊接和螺栓连接等传统的连接方式显示出更优越的特点。它可使同类型的金属     

弹性环氧树脂在建筑工程中的应用

弹性环氧树脂在建筑工程中的应用１．前言由于材料工业的发展、材料的高功能化和加工技术的飞跃进步，建筑装饰材料渐趋多样化。装饰材料的施工方法也不得不随之变化，迫切需要能粘接多种不同新材料的胶粘剂。其中引人注目的是被称为弹性胶粘剂的品种。弹性胶粘剂尚无确切...     

日本塑料材料新品种

日本塑料材料新品种邹盛欧（上海石油化工股份有限公司塑料厂）１．环状烯烃共聚物聚乙烯（ＰＥ）、聚丙烯（ＰＰ）等聚烯烃是塑料的主要品种，广泛用作容器、薄膜、汽车部件、家电部件、一般工业材料等。而利用最新的分子设计技术、催化剂技术，已出现了面目全新的环状烯...     

聚烯烃材料技术和发展应用分析

聚烯烃是重要的石油化工产品,是其他工业部门的重要原料,也是现代生活中人们最常用的、也是最重要的聚合物产品之一,产量大、增长快、产品开发活跃。聚烯烃材料正在由通用高分子向高性能高分子发展。高性能聚烯烃以重量轻、性能好、成本低、用途广、易回收等特色成为21世纪引人注目的优选材料。文中就聚烯烃材料技术和发展应用进行论述。     

聚烯烃薄膜：高表面能防静电

聚烯烃薄膜如聚乙烯（PE）、聚丙烯（PP）等常作为包装材料的内层而被广泛使用。随着软塑包装工业的快速发展以及高新技术的开发与应用，聚烯烃薄膜不断被赋予新的特殊功能，而防静电聚烯烃薄膜就是需求较为迫切的一种。目前市场化的防静电聚烯烃薄膜，因其属极性材料，表面能低：双表面电阻值低，难以进行电晕处理，因而不能与其它塑料基材复合成层状包装材料：单质防静电聚烯烃薄膜的机械物理性能低，限制了它的广泛应用。软塑包装界急需开发一种表面能高、能够与其它基材可靠复合的防静电聚烯烃薄膜。本以新开发的防静电聚乙烯薄膜为例，就其制作工艺及产品性能与同行共同探讨。     

国外胶粘剂发展综述

一、胶粘剂工业概况及其特点胶粘剂工业是随着高分子合成材料的发展而发展起来的一门合成聚合物应用科学。经三十多年的发展,合成胶粘剂已占整个胶粘剂产量的80％以上,基本上取代了过去传统的动、植物胶,而且还在不断发展。现在,在世界胶粘剂生产国家中,美、苏、日和西德等四国居领先地位,其中以美国为第一,苏联为第二,日本为第三,西德为第四(西德在西欧国家中数第一,法国数     

聚烯烃材料的研究开发进展

在塑料消费中,聚烯烃占60%以上,是消费量最大的塑料品种。聚烯烃技术的快速发展是其市场占有率不断提高的关键,其科学技术的发展已引起学术界和产业界的广泛关注。我国已成为世界主要的塑料消费国和生产国。介绍了聚烯烃材料的重要地位和发展趋势,分别就聚烯烃中的高分子物理、聚合工艺、催化剂和助剂的研究进展介绍了我国聚烯烃技术的发展现状。强调了聚烯烃技术对可持续发展和我国石油化工、煤化工产业的发展均十分重要,必将得到持续、稳定的发展。     

聚烯烃熔融接枝研究及应用

聚烯烃通过接技改性可扩大其应用领域。本文介绍了聚烯烃单组分和多组分熔融接枝反应及相关机理。讨论了复合引发剂、接枝单体、聚合物颗粒尺寸及反应设备等因素对熔融接枝反应的影响。同时列举了可用于汽车工业和废塑料回收的接枝聚烯烃与其他聚合物的共混改性方法     

Damage monitoring and analysis of composite laminates with an open hole and adhesively bonded repairs using digital image correlation

High performance composite materials, such as Carbon–Fibre Reinforced Plastic (CFRP) composites, are being increasingly used in aerospace industry, such as fuselage primary structures in Boeing 787 or Airbus 350, where high strength and stiffness are required at minimum weight [1]. The design of composite structures frequently includes discontinuities such as cut-outs for access and fastener holes for joining and they become critical regions under thermo-mechanical loading. Understanding of notched specimen behaviour is necessary for the design of complex structures where parts are mostly connected with bolts and rivets [2]. The effect of these discontinuities on the behaviour of composite materials is an important topic because it causes a relatively large reduction in strength compared to the unnotched laminate [3]. In the first part of the current work, the assessment of the damage process taking place in notched (open-hole) specimens under uniaxial tensile loading was studied. Two-dimensional (2D) and three-dimensional (3D) Digital Image Correlation (DIC) techniques were employed to obtain full-field surface strain measurements in carbon–fibre/epoxy M21/T700 composite plates with different stacking sequences in the presence of an open circular hole. Penetrant enhanced X-ray radiographs were taken to identify damage location and extent after loading around the hole. DIC strain fields were compared to numerical predictions. In the second part of the study, DIC techniques were used to characterise damage and performance of adhesively bonded patch repairs in composite panels under tensile loading. This part of work relates to strength/stiffness restoration of damaged composite aircraft that becomes more important as composites are used more extensively in the construction of modern jet airliners. In the current work, external bonded patches have been studied. Adhesively bonded repairs are the most common type of repair carried out with composite materials [1], [4]. The behaviour of bonded patches under loading was monitored using DIC full-field strain measurements. Location and extent of damage identified by X-ray radiography correlates well with DIC strain results giving confidence to the technique for structural health monitoring of bonded patches.     

动力/储能锂离子电池隔膜制备先进技术及研究进展

锂离子电池主要由电极、隔膜、电解液三大部分构成。其中隔膜作为电池的关键部件之一,极大地影响着电池的综合性能。商业聚烯烃隔膜由于润湿性与耐温性差、孔隙率低等缺点,很难满足高性能锂离子电池隔膜的要求。因此,隔膜的制备技术与材料急需进行深入的研究与探索。本文从近期隔膜的研究热点出发,分别从商业聚烯烃隔膜的改性、静电纺丝法及相分离法制备等方面对动力/储能锂离子电池隔膜最新研究成果进行综述,并指出了未来隔膜的发展方向。     

保税港区出口集运三级供应链博弈分析

基于随机需求,针对出口集运模型下一个国内供应商、一个国内分销商和一个国外零售商组成的三级供应链,运用博弈理论的逆向归纳法,定量比较分析有无保税港区情形下供应链上各成员的最优利润。结果表明：有保税港区后,供应链上成员达到了三方共赢;国外消费者的消费福利提高;供应商可获单位价值退税额与分销商可获单位价值利益的增加,有利于供应链三方利润的增加和消费者福利的提高。     

Möglichkeiten der Geruchsmessung und ‐minderung bei Naturfaserverbunden

Possibilities of Odour Measurement and Reduction of Natural Fibre Plastics The critical attitude of the German public concerning environmental questions has also invaded the world of odours. The evaluation and reduction of odours when using plastic materials has gained increasing significance in the last years. The packaging industry that produces wrapping materials for food and other consumables was the first to test for odours. During the last years the automobile industry has also shown increased interest in pinpointing and measuring odours, not only because of the increased usage of natural fibre reinforced plastics in car interiors, but also because of the general increase of concern over clean air. Natural fibre reinforced plastics, besides having advantages compared to glass‐ and carbon reinforced materials (mechanical properties/weight, CO₂‐equilibrium) also have properties that limit their application possibilities. Emissions and unpleasant odours at certain temperature and humidity conditions are of concern. To determine the origin of odour in bonded materials the single component, production step or their combination causing it has to be found. To achieve odour neutrality in plastics is difficult since production methods or additives can only be determined through prolonged testing and where the human nose is still more important than all the physical electronic measuring methods. The origin of odours and their importance for the well being and health of the population is questioned and forces not only the plastics industry to react. The is why both, plastics‐ and automobile industries are trying to react to the tendencies of the market place and it is the goal of the auto industry to deliver the most odour‐neutral new car.     

Lightweight Cellular Plastics

Plastic foams have found a number of applications in the energy absorption, thermal, and acoustic markets. Here advances that have been made with extruded polystyrene, polyolefin, and polyurethane foams, and their uses, particularly in the automotive industry, are highlighted. The Figure shows a 65 % compressed foam.     

An Empirical Investigation into the Influence of Sealing Crimp Geometry and Process Settings on the Seal Integrity of Traditional and Biopolymer Packaging Materials

This article presents the results of investigations to determine how process settings and crimp geometry affect the seal strength and integrity of traditional polyolefin and biopolymer flexible packaging materials. The results show agreement with previous studies where temperature and dwell time are found to be the dominant factors for both polyolefin and biopolymer films. Pressure and crimp geometry are shown to be secondary factors in the process, up to the point of squeezing the film into molecular contact. In general, it is shown that biopolymers exhibit similar sealing characteristics to more traditional films. Regarding the sealing crimp geometry, it is shown that the crimp pitch has little or no effect on sealing integrity for films with gauges between 25 and 40 µm. However, for the same gauge material, crimp angles more than 80° offer the greatest potential to gain higher seal strengths. It is further shown that with the cellulose and polylactic acid films tested, a higher seal strength can be produced with crimp pitches of 2 mm and lower. Also presented are some more general implications for guiding the selection of sealing crimp geometry and their usage with biopolymers. Copyright © 2012 John Wiley & Sons, Ltd.     

Material behavior uncertainty in the design of bonded systems – Part II: Exhaustive materials characterization and design guidelines

Uncertainties in the performance of engineering systems arise due to idealizations of geometry, material behavior, and loading history. Uncertainties in the geometry are often related to manufacturing processes, while the uncertainty in the material behavior often arises out of materials processing. In this two-part study, we analyze the effect of uncertainty in material behavior on the performance of bonded assemblies in general, but motivated by the example of a fiber-optic system. In the fiber-optic system, the motion of the surface emitting laser relative to the substrate (to which the laser is bonded) due to the viscoelsatic behavior of the bond epoxy causes a loss in the light coupled to the fiber. In the first part of the paper, we develop models to describe the shear displacement and the shear stress in bond layer of the fiber-optic assembly. In the second part, we characterize through extensive experimentation the uncertainty in the viscoelastic behavior of the bond epoxy and use it to develop guidelines for the design of the bonded system.     

Material behavior uncertainty in the design of bonded systems – Part I: Shear displacement and stress prediction

Uncertainties in the performance of engineering systems arise due to idealizations of geometry, material behavior, and loading history. Uncertainties in the geometry are often related to manufacturing processes, while the uncertainty in the material behavior often arises out of materials processing. In this two-part study, we analyze the effect of uncertainty in material behavior on the performance of bonded assemblies in general, but motivated by the example of a fiber-optic system. In the fiber-optic system, the motion of the surface emitting laser relative to the substrate (to which the laser is bonded) due to the viscoelastic behavior of the bond epoxy causes a loss in the light coupled to the fiber. In the first part of the paper, we develop models to describe the shear displacement and the shear stress in bond layer of the fiber-optic assembly. In the second part, we characterize through extensive experimentation the uncertainty in the viscoelastic behavior of the bond epoxy and use it to develop guidelines for the design of the bonded system.