EMC所用环保阻燃剂介绍及优缺点比较

随着人们健康环保意识的增强,寻求环保化、低毒化、高效化、多功能化的阻燃剂已成为阻燃剂行业的必然趋势。对于环保模塑料来讲,必须有相对应的符合法令要求的产品。用环保阻燃剂替代原先使用的溴锑阻燃剂加入到基础配方中制备了环保塑封料,文章简单介绍了目前市场上主要的有机及无机阻燃剂的种类,并重点讲述了在环氧塑封料中引用各环保阻燃剂...     

ECWC13中的PCB基材技术

本文对第13届世界电子电路大会中收录的关于PCB基材技术方面的论文进行了综述：杜邦公司推出了基于高频高速、热量管理及设计方面的新型高频高速挠性板材料Du Pont TM Pyralux TK（TK）及Du Pont TM Pyralux JT（JT）;台湾工研院对于环保材料在CCL的应用中有较深入的研究,并介绍了气相生长碳纤维材料应用于聚酰亚胺挠性板中的研究情况;广州兴森快捷公司对含有热致液晶材料的PCB板的生产参数进行摸索和考察,以验证其在电子电路行业的实际应用;EIPC主席Alun Morgan撰写的关于阻燃剂的论文,则对含卤阻燃剂在行业中的继续应用仍然抱有很大的信心;德国Nabaltec AG公司的Carsten W.IHmels的文章详细介绍了阻燃剂勃姆石在PCB材料中的应用。这些论文展示的一些研究结果,我们可以大概了解到当今PCB基材发展的大致趋势,及一些新型材料的在PCB基材中应用情况。     

绿色环保塑封料（EMC）的研究

为了适应人们对绿色环境的渴求和市场的发展，本文主要从阻燃剂的改进这一角度来研究绿色环保塑封料(EMC)。重点是从传统阻燃剂的阻燃机理到新型环保阻燃剂的阻燃机理，对绿色环保塑封料(EMC)进行探讨。同时也介绍了适用于无铅焊料工艺中对EMC的性能要求。     

无卤化PWB材料

1 前言 近年来全球性的环境意识正在日益提高,降低企业对环境负荷的研究至关重要。欧洲已经制定了关于溴类阻燃剂的法律,在PWB材料方面,正在开发燃烧时不会产生二噁英(dioxin)的非溴类阻燃剂的无     

含磷环氧树脂及其在无卤覆铜板中的应用进展

文章重点综述了含磷环氧树脂和反应型含磷阻燃剂的合成与研究进展,介绍了含磷环氧固化体系在无卤覆铜板中的应用现状,进一步展望了5G浪潮下无卤覆铜板用含磷环氧树脂的发展方向.     

5975 inert MSD用于高分子量多溴二苯醚的分析

前期发表的应用文章介绍了用5973 N inert MSD分析聚合物中多溴二苯醚(PB DEs)的实验结果[1],对所有重要的PBDEs的质谱图加以展示和说明.新的5975 inert MSD作了很多改进,具有许多新特性.其质量范围扩展到1050质量单位.此文展示了八、九和十溴二苯醚及其离子的全扫描质谱图.这些离子远远超出了以前的5973 MSD平台的质量范围.     

雅宝溴系阻燃剂产品四月全球提价

全球领先的阻燃剂供应商美国雅宝公司自2008年4月1日对其全球销售的溴系阻燃剂产品进行提价，合同价格除外。来自雅宝公司的解释称，本次提价是雅宝对于目前原材料价格据高不下，加之公司在环保科技领域加大科技创新投资力度等因素造成的。     

雷达遥感在环境保护工作中的应用

雷达遥感具有穿透力和全天候作业的优势,在环境保护领域中应用需求广泛。面对国家日益严峻的环保形势和最新发射的环境雷达卫星,急需系统介绍雷达遥感技术在环保领域中的应用。文章通过全面分析合成孔径雷达（SAR）在溢油、水华、土壤湿度、植被长势、生物量以及应急监测等环境保护中的应用,为已经发射的环境一号雷达卫星提供明确的应用目标,并为构建全天候、全天时的环境天地一体化监测体系提供重要的技术参考。     

基于绿色理念在机械设计制造中的应用

经济的快速发展使我国工业化的进程不断加快,工厂的生产活动消耗了大量的自然资源,并且给环境带来的污染也日益增大。面对严峻的环境问题,人们逐渐意识到环保的重要性,"绿色环保"理念已经成为了当今社会发展的主要趋势。机械制造业是我国国民经济的重要组成部分,将绿色理念应用到机械设计制造业中,对实现机械制造业和我国经济的可持续发展均有重要的意义。本文介绍了绿色理念的基本含义,绿色理念在机械设计制造中的重要性,并分析了绿色理念在机械设计制造中的具体应用。     

城市工程建设中的环保问题初探

近年来,随着城市规划的大力实施,城市中的工程建设也日益增多,其在建设过程中出现的环保问题严重影响了城市居民的日常生活环境。本文主要就城市工程建设中的环境问题进行探究,并提出相应的环保策略。     

无卤阻燃玻纤增强PA66工程塑料的改性研究

PA66是PA产品中产量最大、应用最广的品种,但存在较易燃烧、燃烧时容易起泡、滴落的缺点,极大的限制了其在各领域的进一步推广应用.目前,对PA66的改性研究主要集中在增强和阻燃两方面,玻纤增强PA66是对PA66增强改性使用最广泛的产品,本文研究不同阻燃剂对玻纤增强PA66阻燃性能的影响和增韧剂用量对无卤阻燃玻纤增强PA66综合性能的影响.研究结果为:红磷阻燃母粒和MCA按一定质量份进行复配协效阻燃,阻燃剂用量少且阻燃效果优异;马来酸酐接枝POE对无卤阻燃玻纤增强PA66体系有良好的增韧效果.     

聚乙烯阻燃光缆护套料的制备工艺研究

在低密度聚乙烯(PE)中添加了纳米氢氧化镁(Mg(OH2))和磷酸三苯酯(TPP)组成的协同阻燃剂,采用共混挤出的方法制备了纳米Mg(OH2)/PE阻燃光缆护套料.对制得的样品进行了氧指数(OI)、示差扫描量热(DSC)法和力学性能的测试,实验结果表明,样品的OI大幅度提高,力学性能和玻璃化温度均满足阻燃光缆护套的要求.     

一种无卤阻燃挠性覆铜板的制备

文章采用端羧基丁腈橡胶(CTBN)增韧含有苯环结构的阻燃环氧树脂,配合使用无卤添加型阻燃剂得到挠性覆铜板用阻燃胶粘剂,用此胶粘剂制备了阻燃挠性覆铜板(FCCL)。分别通过热重分析仪(Tg)、差示扫描量热分析仪(DSC)和其它仪器对胶粘剂和FCCL的热性能、机械性能、电性能等性能进行了全面的分析,并和市售环氧树脂产品进行了对比。结果表明,所制备的FCCL不仅阻燃性可达到UL94V-0级,而且综合性能优异,在实现无卤阻燃FCCL的市场上有一定的前景。     

含磷阻燃剂对无卤覆铜板性能的影响

探讨了磷阻燃剂不同用量对覆铜板各项性能的影响及作用机理。适当用量可以改善阻燃、降低热膨胀系数以及介电常数,但会带来吸水率、成本的提升。     

Functionalizing Carbon Nanotubes by Grafting on Intumescent Flame Retardant: Nanocomposite Synthesis,Morphology, Rheology,and Flammability

An intumescent flame retardant, poly(diaminodiphenyl methane spirocyclic pentaerythritol bisphosphonate) (PDSPB) has been covalently grafted onto the surfaces of multiwalled carbon nanotubes (MWNTs) to obtain MWNT‐PDSPB and according nanocomposites were prepared via melt blending. After high density PDSPB (65 wt %) were attached to the MWNTs, core‐shell nanostructures with MWNTs as the hard core and PDSPB as the soft shell were formed. The resultant MWNT‐PDSPB was soluble and stable in polar solvents, such as DMF. The optical microscopy and TEM results showed that the functionalized MWNTs can achieve better dispersion in ABS matrix. The linear viscoelastic behavior indicated that MWNT‐PDSPB can form network structure at very low nanotube loading than un‐functionalized MWNTs. The results of flammability showed that better flame retardancy was obtained for ABS/MWNT‐PDSPB nanocomposites due to the better dispersion of MWNT‐PDSPB in ABS matrix. The flammability of the composites is strongly dependent on the network structure of nanotubes which reduces the diffusion of volatile combustible fragments generated by polymer degradation which diffuse towards the surface of the burning polymer to evaporate to feed the flame. The grafting of intumescent flame retardant of PDSPB can improve both the dispersion of nanotubes in polymer matrix and flame retardancy of the nanocomposites.     

A Large‐Area,Flexible, and Flame‐Retardant Graphene Paper

Similar to the paper‐making process, the efficient flame retardant graphene paper is conveniently obtained by using graphene oxide (GO) and hexachlorocyclotriphosphazene (HCCP) aqueous pulp. The “paper pulp” can also conceivably be used as ink to make other hydrophilic films become flame retardant paper. Further, the as‐prepared reduced GO‐HCCP paper (RGO‐HCCP paper), compared with GO‐HCCP paper, can maintain its intact structure for a longer time in an ethanol flame. As a consequence of these preparation methods, the bearing temperature of the as‐prepared graphene papers shows a significant increase.     

Polydopamine‐Graphene Oxide Flame Retardant Nanocoatings Applied via an Aqueous Liquid Crystalline Scaffold

A highly effective flame retardant (FR) nanocoating was developed by conducting oxidative polymerization of dopamine monomer within an aqueous liquid crystalline (LC) graphene oxide (GO) scaffold coating. Due to its high water content, the LC scaffold coating approach facilitated fast transport and polymerization of dopamine precursors into polydopamine (PDA) within the water swollen interlayer galleries. Uniform and periodically stacked (14.5 Å d‐spacing) PDA/GO nanocoatings could be universally applied on different surfaces, including macroporous flexible polyurethane (PU) foam and flat substrates such as silicon wafers. Remarkably, PDA/GO coated PU foam exhibited highly efficient flame retardant performance reflected by a 65% reduction in peak heat release rate at 5 wt% PDA/GO loading in an 80 nm thick coating. While many physically mixed flame retardants are usually detrimental to the mechanical properties of the foam, the PDA/GO coating did not affect mechanical properties substantially. In addition, the PDA/GO coatings were stable in water due to the intrinsic adhesion capability of PDA and the transformation of GO to the more hydrophobic reduced GO form. Given that PDA is produced from dopamine, a molecule prevalent in nature, these findings suggest that significant opportunities exist for new polymeric FRs derived from other natural catechols.     

Shelter Forest Inspired Superhydrophobic Flame-Retardant Composite with Root-Soil Interlocked Micro/Nanostructure Enhanced Mechanical,Physical, and Chemical Durability

The heat accumulation caused by the high power consumption of continuously upgrading electronic devices puts forward more requirements for the adaptability and durability of the flame retardant materials. Herein, inspired by the soil reinforcement effect of the shelter forest roots nearby the river and shoal, a superhydrophobic flame-retardant ethylene-vinyl acetate (EVA)/aluminum trihydroxide (ATH) composite with root-soil interlocked micro/nanostructure (MEA/PGCC) is prepared by combining the micro-extrusion compression molding and spray coating. The homogeneously dispersed ATH and the EVA with sufficient mechanical strength provide durability for the long-term work of the MEA/PGCC composite. The root-soil interlocked micro/nanostructure provides robust superhydrophobicity with a water contact angle of 156 ± 1.0° and a rolling angle of 4 ± 1.0° for the MEA/PGCC composite which is beneficial to improve acid and alkali tolerance, thermic resistance, and de-icing performance. The synergism of interface and surface function prominently improves the flame retardancy of the MEA/PGCC composite, which presents a limit oxygen index of 42%, and remarkable reduction in peak heat release rate of 64%, total heat release of 23%, and peak smoke production rate of 47%. The proposed method is a promising candidate for the mass production and practical application of the superhydrophobic flame retardant composite.     

无卤素型挠性印制电路板材料

在制造挠性印制电路板用的挠性覆铜箔层压板的工艺过程中，为了提高线路图形用铜箔与绝缘基材聚酰亚胺薄膜的粘接性，研究开发了专用的表面处理技术和压制成型技术，制成了无卤素、两层结构型粘接性良好的挠性覆铜板；在线路图形表面的保护涂敷材料方面，研发了无机填料的处理技术，用少量的阻燃性填料即可使环氧树脂得出必要的阻燃性，保证了涂层的柔韧性：这两方面的技术促成了完全无卤素型印制电路板的产生。