酚醛模塑料改性及成型工艺研究进展

综述了酚醛模塑料及其成型工艺的研究进展。酚醛模塑料的改性方法主要包括基体树脂改性和填充改性,其中基体树脂改性可细分为结构改性、共聚改性和共混改性等。介绍了酚醛模塑料的主要成型工艺,包括模压成型工艺和注射成型工艺。分析了后固化处理工艺对产品性能的影响,并对今后的发展趋势进行了展望。     

轻质阻燃酚醛泡沫材料的制备与构效关系研究（摘要）

针对可发性酚醛树脂及酚醛泡沫存在的问题,本文作者采用新型不脱水工艺,直接合成了固含量在70％～85％的可发性高固含甲阶酚醛树脂。分析了甲醛／苯酚（F／P）物质的量之比和催化剂种类对树脂性能的影响;讨论了酚醛泡沫制备工艺,建立了酚醛泡沫表观密度一力学性能模型;采用木质纤维表面处理方法制备纤维复合酚醛泡沫;采用无卤阻燃系统制备阻燃改性的酚醛泡沫;采用酸化处理方法制备无机复合酚醛泡沫。主要研究内容和结论如下：     

酚醛纤维及其性能的研究

综述了酚醛纤维在国内外的研究状况;分析了酚醛纤维的制备工艺及固化方法;阐述了酚醛纤维的主要性能及应用,包括阻燃、耐烧蚀隔热、耐腐蚀及酚醛基碳纤维以及酚醛基活性炭纤维前体;指出各种高性能、功能化酚醛纤维、酚醛基碳纤维以及酚醛基活性炭纤维将是未来研究开发的重点。     

酚醛SMC模压工艺参数的确定

本文对酚醛SMC的模压工艺进行了研究，确定了酚醛SMC模压成型时的模压温度，成型压力，保温时间等工艺参数。     

酚醛纤维热性能研究进展

介绍了酚醛纤维的制备工艺和改性方法,综述了国内外近年来采用共混、共聚、接枝等方法以及改进制备工艺提高酚醛纤维耐热性的研究进展,并对该领域未来的研究方向作出展望。     

酚醛模塑料在汽车轻量化中的应用

简要概括了汽车轻量化技术发展状况及其实现方法，介绍了酚醛模塑料及其成型工艺。同时详细讨论了酚醛模塑料在汽车刹车系统和发动机等部件中的应用以及酚醛模塑料在汽车应用中存在的问题。     

影响酚醛泡沫塑料成型加工的因素

探讨了影响酚醛泡沫塑料成型和加工的各种因素,确定了最佳工艺条件,制备出综合性能优良,形状复杂的酚醛泡沫塑料浇铸制品。     

常温下可发性酚醛树脂合成研究

研究了可常温发泡酚醛树脂的合成工艺,从而降低了酚醛泡沫的生产周期和成本,拓宽了新型隔热材料———酚醛泡沫塑料的使用范围。     

酚化腐植酸改性酚醛泡沫材料的制备与性能分析

以特定工艺制备酚化改性腐植酸(PHA),选择并优化工艺参数从而制成PHA改性酚醛泡沫材料。采用傅里叶红外分析、热失重分析、氮吸附和冲击强度测试等方法对PHA改性酚醛泡沫材料结构和性能进行了分析。结果表明,当PHA含量为40%(质量分数,下同)时,PHA改性酚醛泡沫     

利用双酚A副产生产制桶用密封胶

本文介绍了使用双酚A生产过程中的副产物研制改性酚醛胶的工艺过程,这种酚醛胶可用于制桶密封用,经实验表明,可满足工艺要求。     

工程塑料的切削加工艺

主要介绍各种工程塑料切削加工的特点，探讨了塑料切削加工形式及其对加工质量的影响，给出了各种塑料切削加工的合理工艺方法。     

氟树脂性能与加工应用（续完）

介绍了氟塑料加工过程分解产生的低分子氟化物以及它们的毒性，叙述了加工过程中应采取的安全措施；介绍了氟塑料加工时产生的废料的回收方法及用途。     

Ceramic Laminates by Gelcasting

Laminated ceramic composites are appealing for many applications due to their unique and customizable thermal and mechanical properties. Gelcasting is a relatively new, yet commercially proven, near-net-shape processing technique suitable for laminate production. A review of gelcasting techniques and a discussion of their application to laminate processing are provided, along with an overview of laminate design and processing concerns. Specific examples of single-phase laminates produced via gelcasting are provided, including porous/dense alumina and magnetically aligned iron titanate and barium hexaferrite structures.     

微孔塑料及其挤出成型技术

介绍微孔塑料及其挤出成型技术,并与一般挤出发泡成型进行了比较。     

Mechanisms of antioxidant action: C–nitroso compounds as UV stabilizers for polypropylene

It is shown that nitroso-tert-alkanes are highly active UV stabilizers which become at least partially chemically attached to polypropylene during processing. The aromatic nitroso compounds are less effective as light stabilizers but are more effective than their alkyl analogues as thermal oxidative stabilizers. Mechanisms are proposed to account for the antioxidant activity of the nitroso compounds and their ability to cause crosslinking of the polymer during processing.     

五倍子资源加工利用产业发展现状

我国是五倍子主产国和加工国,产量约占世界总产量的95%。目前,我国五倍子资源加工利用行业已经建立起包括五倍子高效培育、精深加工、新产品及其应用等产品发展配套技术在内的较为成熟的全产业链利用技术。本文介绍了五倍子功能及其资源分布、五倍子加工主要产品及其加工技术现状、产品及其分析检测方法的标准化体系建设,指出了五倍子加工行业发展面临的主要问题,分析了五倍子产业发展现状及未来发展方向。     

Mitochondrial Processing Peptidases—Structure,Function and the Role in Human Diseases

Mitochondrial proteins are encoded by both nuclear and mitochondrial DNA. While some of the essential subunits of the oxidative phosphorylation (OXPHOS) complexes responsible for cellular ATP production are synthesized directly in the mitochondria, most mitochondrial proteins are first translated in the cytosol and then imported into the organelle using a sophisticated transport system. These proteins are directed mainly by targeting presequences at their N-termini. These presequences need to be cleaved to allow the proper folding and assembly of the pre-proteins into functional protein complexes. In the mitochondria, the presequences are removed by several processing peptidases, including the mitochondrial processing peptidase (MPP), the inner membrane processing peptidase (IMP), the inter-membrane processing peptidase (MIP), and the mitochondrial rhomboid protease (Pcp1/PARL). Their proper functioning is essential for mitochondrial homeostasis as the disruption of any of them is lethal in yeast and severely impacts the lifespan and survival in humans. In this review, we focus on characterizing the structure, function, and substrate specificities of mitochondrial processing peptidases, as well as the connection of their malfunctions to severe human diseases.     

Processing for production of edible soya flour

Conventional soybean processing plants, as normally designed and constructed for production of animal feeds, are not suitable for production of edible soya flour without some modifications being made in equipment, process design and operating procedures. All sections of the plant are involved, from receiving and bean storage to final products handling. Experiences from four edible soy plants are described: one is part of a new processing complex, the others are conversions of existing, older processing plants. All are in commercial operation. The processing requirements for production of edible soya flour are reviewed and described with special reference to their application in the plants under study. Any conventional soybean processing plant that is normally well operated can be modified to permit production of edible soya flour.     

两种干燥设备及其工艺过程的解析

从预结晶器和干燥塔的结构性能、切片预结晶和干燥过程的进行方式比较了吉玛和BM公司两种不同的切片干燥设备,指出了两者在操作性能、系统设计上的优缺点,井总结归纳了常见故障的排除方法。     

Improvement of processing parameters by using processing aids during the linear low‐density polyethylene film blowing process

Polymer processing aids are used to improve processing properties in the polyethylene industry. These materials improve not only the physical and mechanical properties of the final products but also their processing properties. This paper studies some of the processing variables such as die pressure, melt temperature, masterbatch activity, and die gap by examining the functions of polymer processing aids and, last but not least, the effects on the film blowing process of two‐component processing aids containing a perfluorinated additive and polyoxyethylene. J. VINYL ADDIT. TECHNOL., 2010. © 2009 Society of Plastics Engineers