水辅与气辅成型残余壁厚的对比研究

在实验的基础上,首先分析了水辅注射成型与气辅注射成型的特点,并从机理上分析了水辅成型和气辅成型制件残余壁厚的形成,进而对比分析了水辅及气辅成型制件残余壁厚的大小。结果表明,对于具有流动方向偏转结构的模具,水辅成型制件的壁厚均匀性优于气辅成型制件;水辅成型更易于生产截面为圆形的制件。     

新型耐高低温三防绝缘涂料

介绍了一种耐高低温三防绝缘涂料，并列举了涂料性能的检验结果。研制的涂料体系具有良好的耐高低温性、绝缘性和三防性能。     

氯乙烯-丙烯腈共聚物的开发及应用

叙述了氯乙烯-丙烯腈共聚物的难燃性、耐化学药剂性及热成型性等主要性能。指出,该共聚物可制得较优良的阻燃材料,并讨论了该共聚物的聚合方法。     

氟橡胶TP

氟橡胶TP是C_2F_4-C_3H_6共聚物经特殊处理后制得的一种新型含氟弹性体。采用过氧化物硫化剂进行硫化。氟橡胶TP具有优良的加工性能,适用于模压、挤出成型。成型制品具有良好的耐高温性能,可以在高温     

高强度溶胶分散黑的制备及其应用性能研究

采用自制新型助剂作分散剂经研磨,制得高强度环保型黑色溶胶分散染料.测试了染料粒径、高低温分散性、稳定性和应用性能,并与常规分散粉/液黑染料进行对比.结果表明,自制的高强度环保型溶胶分散黑粒度小、强度高、分散性和稳定性优良;同时染色提升性及染深性优良,染织物色牢度好;染色残液深度浅,COD值低.该溶胶染料流动性好,便于计...     

阻燃绝缘级PVC电缆料的研制

105℃阻燃绝缘级PVC电缆料的研制吸取了70℃阻燃绝缘级电缆料的经验,合理选择增塑剂和阻燃剂,制得物理机械性能和阻燃性能满足105℃阻燃绝缘级标准的电缆料。试验结果表明,该阻燃电缆料的二次加工性能好,加工温度范围宽,易于操作,制得的电线符合生产厂家的技术要求。     

新产品 新技术

液体注射成型硅橡胶中蓝晨光化工研究院开发的液体硅橡胶具有良好的电气绝缘性能,机械强度高,耐老化性能和高低温(-60～200℃)性能优良。该产品的液体注射成型工艺具有快速、高效的特点,可实现硅橡胶制品生产过程的自动化。液体注射成型硅橡胶的技术含量较高,是用途广泛、发展迅速的一类硅橡胶产品。该项目在实施过程中,解决了:1.白炭黑填料的工业化处理。采用特制的填料处理设备和工艺,可对白炭黑及其它填料进行有效处理,得到补强好、增稠作用小的液体硅橡胶补强剂;2.合成制备了高效催化剂和特种硅橡胶加工助剂,并通过对硅橡胶配胶工艺条件…     

注塑成型条件对聚甲醛制品冲击性能的影响

用精密注塑机加工成型聚甲醛制品，考察了注塑成型条件如注射压力、注射时间、冷却时间、模具温度、后处理条件等对制品冲击性能的影响，找到了最佳工艺条件，制得了冲击性能优良的聚甲醛制品。由扫描电镜观察、结晶度测定和Ｘ射线衍射分析表明，聚甲醛制品的冲击韧性与其局部缺陷、裂纹、结晶度、晶粒大小等有关，只有改善制品的均匀性，减少局部缺陷的产生控制结晶度和晶粒大小在适当范围，才能制得冲击性能优良的制品。     

基于响应面传动器成型缺陷研究

传动器通过注塑成型工艺制得,其成型质量直接影响传动器的性能。在注塑成型工艺过程中,模具温度、熔体温度、保压压力以及冷却时间等工艺参数对制件的影响较显著,不合理的工艺参数导致制件出现较大的翘曲变形。通过建立响应面模型,以模具温度、熔体温度、保压压力以及冷却时间为响应参数,以制件的翘曲变形量为响应目标,优化一组最佳的成型工艺参数组合。结果表明：四个变量的影响程度分别为：模具温度>保压压力>冷却时间>熔体温度。当模具温度80℃、熔体温度180℃、保压压力90 MPa、冷却时间20 s,制件的翘曲变形量最小为1.955 mm,较未优化的翘曲变形量降低0.427 7 mm,有效地改善了制件的成型质量。     

聚三氟氯乙烯加工工艺的探讨

<正> 氟塑料是各种含氟塑料的总称,由含氟单体如四氟乙烯、六氟丙烯、三氟氯乙烯、偏氟乙烯、氟乙烯以及乙烯等通过均聚或共聚反应制得。含氟塑料与其它热塑性塑料比较具有优越的耐高低温、耐腐蚀、摩擦系数低、绝缘性能好等特性,已成为尖端科学技术,军工生产以及其它工业部门所不可缺少的材料之     

Development of fly ash cenosphere-based composite for thermal insulation application

Cenosphere-based composite was developed with addition of clay and other additives, by dry processing route. The performance of cenosphere as high-temperature insulating material was studied. Cenosphere stands unique among the constituents found in fly ash due to its hollow spherical structure. Cenosphere is utilized in numerous modern applications due to its unique properties such as lightness, high compressive strength, enhanced flow characteristics, less water absorption, chemical inertness, and good thermal resistance. Keeping cenosphere as major component, three different mix recipes for insulating brick were made. The recipes were blended and shaped by pressing, followed by drying and sintering at 1000°C. The prepared samples were analyzed for their physical, mechanical, and thermal properties. The surface and pore distribution are analyzed by scanning electron microscope. Results from the analysis shows that cenosphere can be used as high temperature insulating material.     

改性聚酰亚胺树脂复合材料的研究

以4，4-二苯甲烷双马来酰亚胺、二氨基二苯甲烷、环氧树脂为主要原料合成性能优良的改性聚酰亚胺树脂体系；以此树脂为基体、玻璃纤维布为增强材料制作的复合材料具有玻璃化温度高、机械强度好、介电常数低等优异的综合性能，可用于制作耐高温、高强度绝缘材料。     

Synthesis and application evaluation in lithium battery furnace of mullite insulating refractory bricks from tailings

In order to realize efficient and comprehensive utilization of kyanite tailings (KT) mullite insulating firebrick (M-IFB) with high strength and low thermal conductivity with spherical-low connectivity porous were success fully prepared by using KT and alumina as the main raw material. Control of the porosity and properties of mullite insulating firebrick can be easily and accurately achieved by adjusting the heat treatment temperature and the amount of forming agent. The compressive strengths, bulk density, thermal conductivities, liner change, and porosities ranged from 25.86–53.26 MPa, .58–1.61 g/cm³, .236–.599 W/(m·K), −1.01 to −.426 % and 66.89 to 78.63 %, respectively. The creep rate of M-IFB was compared with that of current insulating bricks after them used in the baking kiln of lithium ion battery cathode materials in the laboratory to simulate the environment. The results show that the M-IFB corrosion resistance was obviously superior to the current insulation bricks. The high porosity high strength mullite insulating firebrick prepared by this method is expected to be used in thermal insulation system of kiln to realize the comprehensive utilization of solid waste.     

Development of a new composite material from waste polymers,natural fiber,and mineral fillers

This work describes a panel made from waste polyethylene, henequen fibers, and mineral fillers. The physical and mechanical properties of the product were determined and compared with the properties of commercial panels. The new material has good mechanical properties and high environmental resistance. Its thermal insulating capacity is about 10 times better than that of asbestos–cement panels. The adhesion grade between fibers and polymer was investigated.     

熔融铜渣回收铜及铜铁合金工艺研究

本文根据某炼铜熔融炉渣的矿物特性和选矿工艺特点,提出了一种"两步法"新工艺分别回收铜和铜铁合金,即低温阶段回收铜,高温阶段回收铜铁合金。该工艺对铜和铜铁合金提取比较充分,回收率均在90%以上。回收铜的品位可达99%,可直接送去火法精炼;产出的铜铁合金有害杂质少,可作为耐候钢的理想原料,其价值比纯铁高。此工艺用粉状或粒状非焦煤代替焦炭作还原剂,不用烧结,可以充分利用铜厂现有的设备,节省投资成本。该工艺简单易行,操作方便,有效实现了铜渣的资源化利用,具有良好的经济、社会和环境效益,是一种应用前景广阔的铜渣再利用工艺。     

防爆电容器盖板用阻燃增强PBT复合材料的研制

采用自制的阻燃协效剂制备了本色及黑色阻燃增强聚对苯二甲酸丁二醇酯(PBT)材料。该材料具有较高的阻燃等级,较高的力学性能,其相对漏电起痕指数(CTI)达到300 V,灼热丝起燃温度(GWIT)达到800℃,同时该材料具有优异的耐热性能,可广泛应用于断路器外壳及电容器领域。     

Vermiculite — a Promising Material for High-Temperature Heat Insulators

Vermiculite, a mineral of natural occurrence of the group of hydromicas, when heated to above 300°C, expands to become a highly efficient heat-insulating material. The expanded vermiculite, owing to its unique properties – low bulk density, low heat conductivity, relatively high melting point, chemical inertness, endurance, and environmental safety – can be used as a filler for heat-insulating materials. Heat insulators based on expanded vermiculite can be used in thermal power units with the hot-wall temperature not exceeding 1150°C as replacement for lightweight chamotte components and fibrous heat insulators.     

Photooxidation of anhydride-cured epoxies: FTIR study of the modifications of the chemical structure

Anhydride-cured epoxies are used in electrical engineering to manufacture insulators. The purpose of this study is to determine the modifications undergone by these resins when exposed to solar-type radiation (radiation with a wavelength of more than 300 nm). Two epoxy–anhydride systems have been studied. Using transmission Fourier transform infrared (FTIR) and attenuated total reflection (ATR), we have determined the structural modifications and the groups formed during photooxidation. The degradation is very heterogeneous, more significant on the surface than in the bulk of the material, and a considerable decrease in almost all the initial functional groups is observed. The flexibilized system, richer in ester groups but containing fewer phenyl groups, degrades more rapidly during the first hours of exposure than the nonflexibilized system. Two explanations accounting for this faster degradation in the first hours of exposure are drawn from ultraviolet absorbance analysis and degradation mechanisms considerations. After 40 h of irradiation, the disappearance rate of the aromatic groups depends only on their initial concentration, whereas the formation kinetics for the hydroxyl groups is limited by the diffusion of oxygen in the material. Chemical treatments using SF₄, NH₃, and NaCl have revealed the formation of hydrophilic products, acids, and alcohols. Their presence and particularly high concentration at the surface could very well be responsible for the degradation of the insulating properties of the electrical insulators. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 1221–1237, 1998     

一种超深水平井堵漏材料室内评价研究

针对超深水平井堵漏中常规堵漏材料的抗温、抗压特性,以及大颗粒堵漏材料输送等问题,室内研制了一种超深水平井架桥颗粒堵漏材料CQ-GXJQ。通过室内评价分析表明,该堵漏材料具有粒度可调、抗高温、机械强度高、密度低、具化学惰性等优点,可作为刚性架桥粒子用于超深水平井桥接堵漏技术中,避免因高温、高压作用导致堵漏剂性能发生变化或因长水平段运移过程中大颗粒堵漏材料提前沉降堆积而引起的堵漏失败问题。     

超细石英砂粉体的机械球磨工艺优化研究

利用长江沿岸低品位石英砂开发研制保温隔热砖,研究球磨参数对低品位石英砂粒径的影响,为制备高性能的保温隔热砖奠定原料基础。研究结果表明:随着球磨时间的延长,石英砂粒径减小;随着球磨转速的增加,石英砂粒径逐渐减小;随着球磨机装料量的增加,石英砂的粒径增加;随着球比的增加,石英砂粒径逐渐增加。综合考虑整个工艺过程性价比,确定最佳球磨参数为:球磨时间为60min,球磨转速为300r/min,球磨机装料量为200g/L,大小球质量比值为0.75。