无卤阻燃热收缩套管的热稳定性研究进展

综述了红磷、有机磷系及氮系阻燃剂及金属氢氧化物阻燃剂对热收缩套管热稳定性的影响,详细分析了热收缩管的成型工艺过程中热历史及辐照交联过程对产品热性能的影响。提出通过阻燃剂的包覆改性、添加抗氧剂及改进辐照工艺提高无卤阻燃热收缩套管热稳定性的建议。     

热收缩套管及其成型方法

本文介绍了热收缩套管的收缩机理及成型方法，如气压吹胀法、机械扩张法和缠绕法等。并对管材结构、原料及主要工艺技术简要地进行了比较和评价。     

新型烟草用聚乳酸降温段挤塑加工

对聚乳酸(PLA)降温段异型管产品结构、挤出模头设计及挤塑成型原理进行研究,进而对PLA降温段异型管挤塑成型工艺进行系统分析.提出了影响PLA降温异型管挤塑加工成型生产效率的关键工艺参数,如挤出模具、定型定径套管长度、真空度等,为得到稳定挤出的PLA降温段产品提供系统思路.     

热收缩套管的发展概况

介绍了国内外热收缩套管发展情况,热收缩套管的特性、制造方法和用途等。     

辐射交联热收缩制品制造技术

介绍了辐射交联热收缩制品制造技术，对热收缩制品生产过程中的3个关键工序（挤出成型、辐射交联、扩张成型）的影响或决定产品质量的技术问题进行了初步阐述。     

磁性热收缩套管用磁粉简介

本文简述了磁性热收缩套管常用的几种磁粉,介绍了在制备磁性热收缩套管时选用磁粉的要求及影响磁粉性能的因素,并给出了高频变换器中所用磁性热收缩套管用磁粉的选择建议。     

一种辐照交联阻燃热收缩标识套管及其制备方法

由广州凯恒科塑有限公司申请的专利（专利号CN100387646,公开日期2007-01—17）“一种辐照交联阻燃热收缩标识套管及其制备方法”,涉及的阻燃热收缩标识套管以乙烯-醋酸乙烯酯共聚物、乙烯-丙烯酸乙酯共聚物、EPR、阻燃剂十溴二苯乙烷、三氧化二锑、表面活化处理过的超细氢氧化镁及其它助剂为原料,经混炼造粒、挤出成型、辐照交联、扩张定型、整平处理等工序制得。     

辐射交联聚烯烃热收缩材料性能的研究

研究开发了辐射交联聚烯烃热缩套管并与国内外同类热收缩套管(RC、HS、RS、CC)进行了性能对比,分析研究了自制热收缩材料的热缩性能、力学性能、阻燃性能、耐溶剂性、耐老化性及电性能。结果表明,研发的辐射交联聚烯烃热收缩管具有优异的热收缩性能、机械性能、耐老化、耐溶剂性能等综合性能,且性能稳定,满足或优于YMS性能指标,具有一定的实际应用价值,对新型热收缩管的发展研究具有重要的理论和指导意义。     

聚全氟乙丙烯(FEP)热收缩管材在CFRP成形中的应用

分析了碳纤维复合材料(CFRP)异型管在成形过程中表面皱折产生的原因,利用FEP热收缩管材的耐高温性、不粘特性和热收缩性等特性,采用合理的工艺技术,提高了异型管表面质量     

阻燃型硅橡胶热收缩套管的研制

以硅橡胶，EVA、EPDM、防老剂、阻燃剂等为原料，研制了阻燃型硅橡胶热收缩套管，并对其性能进行了测试。     

新型HDPE通信光(电)缆护套料的研制

通过对基础树脂,改性树脂的选择,进行了新型ＨＤＰＥ通信光（电）缆护套料的配方设计,并探讨了成核剂,熔体粘度调节剂等对护套料性能的影响,结果表明：成核剂的加入可使ＨＤＰＥ护套料的密度提高,熔点降低,加入熔体粘度调节剂则可使护套料的低温脆性、低温伸长率、断裂伸长率提高。新研制的ＨＤＰＥ护套料加工温度低,加工温度范围宽,既可用于通信电缆也可用于光缆外层护套材料。     

Molding of conical ceramic articles from aqueous slurry

Results of design and construction developments focused on the problem of centering of a core in the cavity of a gypsum mold, the production of ceramic blanks with thickness variability and specified shape, and ways of increasing the uniformity of articles in molding of large sheathing for antenna radomes by means of aqueous slurry casting are presented.     

球头螺母成型工艺的改进及优化

用聚酰胺66(PA66)制作了球头螺母为解决产品装配时出现的断裂纹和变软问题,对球头螺母注塑工艺提出一些改进要点,对材料干燥、色母料、模具、调湿、检测作出了相应调整.工艺改进及优化后,解决了产品裂纹和变软问题,稳定了产品质量,得到了用户的认同.     

Control of molding pastes for an abrasive tool made of silicon carbide and electrocorundum micropowders in a ceramic binder

The possibility of using a small VIMS-1 device for measuring the electrophysical properties of abrasive molding pastes made of micropowders in developing formulas for an abrasive tool and for controlling the quality of the pastes in production conditions was examined. It was shown that introduction of control of the electrophysical properties of molding pastes is a real possibility for obtaining molding pastes of stable quality.     

气体辅助注射成型气体薄壁穿透的数值模拟研究

气体辅助注射成型中，气体的薄壁穿透是影响注塑件强度和性能的重要因素。运用有限元法及CAE技术，就聚合物流变性能及工艺参数对气体薄壁穿透的影响进行了数值模拟，探索了流变性能、注射工艺参数与气体薄壁穿透的规律性关系，用流变学理论分析了其影响机理，并揭示了气体薄壁穿透的形成原因。本研究的数值模拟结果与T．J．Wang等和D．M．GAO等的实验结论相符合。     

不同工艺碳纤维增强复合材料构件的力学性能

针对碳纤维增强复合材料在电动汽车车身上的应用,分别采用手糊、真空袋压和模压三种成型工艺,设计制备了碳纤维增强复合材料层合板和双帽形管件两种实验样件。对样件进行了单向拉伸和三点弯曲试验,对构件的力学性能、表面质量、微观结构和破坏形式进行了比较,并分析了不同工艺性能存在差异的原因。研究表明:采用模压工艺成型的复合材料结构件气泡少,孔隙率小,表面质量最好;模压成型的层合板拉伸强度比手糊成型的提高了14.39%,管件弯曲强度比手糊成型管件提高了一倍,比真空袋压成型管件提高了47.58%。研究证实模压成型相对于手糊和真空袋压工艺,产品具有较优良的力学性能和一致性,较适合于电动汽车等轻量化结构的成型。     

格栅形碳纤维复合材料制件成型技术研究

介绍了一种格栅形碳纤维复合材料锥筒制件的成型工艺技术。纤维采用日本东丽公司的M40，基体为648酚醛环氧树脂一三氟化硼单乙胺体系（4211体系），采用铸铝模具、真空袋热压罐成型工艺。通过工艺研究，突破了模具设计与制造、铺层设计、制件外观质量保证、制件尺寸精度控制、成型工艺等关键技术，成型的制件格栅条宽度和厚度均匀，外表光洁，尺寸精度高，满足了设计要求。     

Preparation and characterization of low-halogen and nonhalgoen fire-resistant low-smoke (FRLS) cable sheathing compound from blends of functionalized polyolefins and PVC

An attempt is made to develop a novel series of cable sheathing compounds with variation in chlorine content and sufficient fire retardance and unique low-smoke characteristics. These are prepared by blending PVC and functionalized polyolefins in different compositions. PE and EPDM have been functionalized by grafting dibutyl maleate (DBM) using DCP as initiator. FRLS compounds made from PVC-functionalized polyolefin blends possess the special characteristics of low-smoke, low-acid-gas generation, increased fire retardance, and improved volume resistivity, which are much better in comparison with a typical PVC sheathing compound. Thermoplastic elastomer (TPE) based nonhalogen FRLS compounds are also reported. The mechanisms for grafting, polymer-polymer and polymer-filler interactions have been presented.     

Optimalization of processing conditions for thermosetting polymers by determination of the degree of curing with a differential scanning calorimeter

The curing reaction of thermosetting polymers is accompanied by exothermal heat which has been measured with a differential scanning calorimeter. The Perkin-Elmer DSC-1 B was used for recording the curing behavior of a diallyl phthalate molding compound and two unsaturated polyester molding compounds. The residual heat of reaction has also been determined by a dynamic DSC scan of partly cured products made at various mold temperatures and curing times. It was thus possible to calculate the degree of curing and to dictate the optimum processing conditions for the indicated molding compounds. The interpretation of results leads to the conclusions that the DSC can be used to set specifications and to perform quality control for the molding compounds and that the most significant processing parameter is mold temperature.     

基于moldflow相机外壳注塑成型优化设计

以缩短产品生产周期,降低成本及提高产品质量为目的,利用moldflow／MPI对相机外壳成型过程进行了模拟分：析。根据模拟分析得到熔接痕、流动前沿温度、体积收缩率和翘曲等结果,优化浇口设计及成型方案。分析结果对塑件注射成型应用具有指导作用。