二段硫化的均聚型/共聚型氯醚共混胶的性能

研究了二段硫化对均聚型(CO)／共聚型(ECO)氯醚共混胶的力学性能以及高温压缩永久变形的影响：结果表明，采用NA-22硫化体系硫化的CO／ECO共混胶，在合适的二段硫化条件下，可增加硫化胶的拉伸强度，但降低了其扯断伸长认；而采用TCY硫化的共混胶．二段硫化后，硫化胶的拉伸强度基本不变，扯断伸长率减小，二段硫化能明显减少CO／ECO共混胶的高温压缩永久变形，而且在一定范围内．二段硫化时间的延长有利于减少硫化胶的高温压缩永久变形。     

动态硫化制备聚烯烃弹性体/三元乙丙橡胶/聚丙烯热塑性硫化胶的性能

讨论了三元乙丙橡胶、硫化剂(TX-29)及聚丙烯用量对聚烯烃弹性体/三元乙丙橡胶/聚丙烯热塑性硫化胶硫化特性和力学性能的影响。结果表明,随着三元乙丙橡胶生胶用量的增加,热塑性硫化胶的交联程度逐渐降低,胶料的拉伸强度、撕裂强度、定伸应力、硬度和高温压缩永久变形都呈减小趋势,而扯断伸长率和扯断永久变形变大。随着硫化剂用量的增加,胶料的拉伸强度、撕裂强度和定伸应力先增大后减小,高温压缩永久变形和扯断伸长率逐渐减小。随着聚丙烯用量的增加,胶料的流动性和力学性能改善,高温压缩永久变形呈现先增大后减小的趋势。     

二段硫化条件对丙烯酸酯橡胶性能的影响

研究二段硫化条件对活性氯型丙烯酸酯橡胶性能的影响。试验结果表明，二段硫化温度一定时，延长硫化时间可减小压缩永久变形，对力学性能、耐热性和耐油性影响不大；随着二段硫化时间的延长，硫化胶交联密度增大，尔后减小，再延长硫化时间，减小趋于平缓。     

硫化剂TCY用量对CM/ACM共混硫化胶性能影响研究

研究了硫化剂TCY的用量对氯化聚乙烯橡胶(简称CM)/丙烯酸酯橡胶(简称ACM)共混硫化胶性能的影响。结果表明,随硫化剂TCY用量的增加,共混胶焦烧时间基本不变;MH—ML的值逐渐增大,交联程度增加;硫化胶的硬度逐渐增大,撕裂强度先增大后减小;拉伸强度先下降后上升,100%定伸应力增大,扯断伸长率和永久变形增大;老化后拉伸强度先下降后上升,100%定伸应力增大,扯断伸长率和永久变形增大;拉伸强度和100%定伸应力大于老化之前,差值较小。扯断伸长率、永久变形小于老化之前;耐热油老化后拉伸强度、100%定伸应力、扯断伸长率、永久变形的变化趋势与未耐热油老化之前基本相同,且低于耐热油老化之前;体积变化率、质量变化率均下降,耐热油性提高。     

硫化剂DTDM对促进剂NA-22/氧化镁硫化体系ECO胶料性能的影响

试验研究硫化剂DTDM对促进剂NA-22／氧化镁硫化体系共聚型氯醚橡胶(ECO)性能的影响。结果表明，在促进剂NA-22／氧化镁硫化体系中加入硫化剂DTDM，可提高胶料的加工安全性，加快胶料的硫化速度；随着硫化剂DTDM用量的增大，ECO硫化胶的邵尔A型硬度和100％定伸应力增大，拉断伸长率和撕裂强度减小，压缩永久变形总体呈下降趋势；经热空气老化后，ECO硫化胶的拉伸性能保持率在80%以上；硫化剂DTDM用量不宜超过0．8份。     

硫化体系对CO/ECO共混胶压缩永久变形的影响

研究了不同硫化体系对CO/ECO共混胶的硫化特性，高温压缩交变形的影响。结果表明，采用三嗪类衍生物硫化体系的CO/ECO共混胶高温压缩永久变形较小，增加硫化剂Na-22或TCY的用量或者对胶料进行二次硫化均能减小胶料高温压缩永久变形。在适当的二次硫化条件下。加入适量的TMTD能减小Na-22硫化的共混胶高温压缩永久变形，TMTD用量过多则增大共混胶高温压缩永久变形，在TCY硫化体系中加入TMTD则使得共混胶高温压缩永久变形增加。     

双酚AF/BPP硫化体系对氟橡胶性能的影响

试验研究双酚AF、苄基三苯基氯化磷（BPP）用量及一段硫化温度对氟橡胶性能的影响。结果表明，随着双酚AF用量的增大，胶料的ML减小，MH增大，t10和t90延长；硫化胶的硬度和100％定伸应力增大，拉断伸长率和拉断永久变形减小，拉伸强度呈先升后降趋势。随着BPP用量的增大，胶料的ML增大，t10和t90缩短；硫化胶的物理性能变化不大。随着一段硫化温度的升高，胶料的ML和MH减小，ts1和t90缩短；硫化胶的物理性能下降。     

舰船用高性能密封橡胶研究(Ⅰ)硫化剂对氟橡胶硫化胶物理性能的影响

研究了硫化剂种类、用量对氟橡胶硫化胶的物理性能的影响。结果表明，硫化剂用量增加，硫化胶的硬度增大，扯断伸长率降低，拉伸强度先增大后降低，出现一个极大值，硫化胶的压缩永久变形先减少后增大，存在一极小值。     

用双螺杆挤出机制备丁腈橡胶/尼龙12热塑性弹性体

采用双螺杆挤出机通过动态硫化法制备了丁腈橡胶/尼龙12热塑性弹性体,考察了双螺杆挤出机的螺杆转速和机筒温度对所制备热塑性弹性体力学性能和微观形态的影响。结果表明,用双螺杆挤出机动态硫化制备的丁腈橡胶/尼龙12热塑性弹性体呈两相"海岛结构",即丁腈橡胶为分散相、尼龙12为连续相。随着挤出机螺杆转速的提高,弹性体的硬度、拉伸强度和扯断伸长率先增大后减小,撕裂强度和压缩永久变形逐渐降低;螺杆转速对弹性体耐油性能的影响不大;当螺杆转速增至400 r/min时,丁腈橡胶的粒径较小且分布均匀。随着双螺杆挤出机温度的升高,弹性体的硬度和拉伸强度逐渐增大,扯断伸长率、撕裂强度和压缩永久变形均先增大而后减小,耐油性能变差;温度升高使得丁腈橡胶难于在剪切作用下破碎,颗粒变大且分布不均。     

新型补强剂Le在乙丙橡胶中的应用

考察用过氧化物硫化的不同牌号EPDM的加工性能、物理机械性能及新型补强剂Le部分替代炭黑N550对EPDM胶料性能的影响。结果表明,KELTAN4703具有较好加工性能及物理机械性能,随着新型补强剂Le/N550并用比的增大,胶料的门尼粘度和MH均减小,tc90增加,胶料的拉伸强度、撕裂强度都是先增大后减小,扯断伸长率、扯断永久变形和压缩永久变形先减小后增大,磨耗和弹性呈增大趋势。当新型补强剂Le/N550并用比为20/40时,胶料的综合性能最佳。     

耐高温尼龙聚邻苯二甲酰胺的研究进展

综述了聚邻苯二甲酰胺(PPA)的特性和应用,对部分PPA新品种制备方法及表征测试作了介绍,还介绍了PPA在耐热性、吸水性、尺寸稳定性、耐焊锡性等方面的研究进展。     

Improving the bending and corrosion resistance of an enamel by the addition of β-Si3N4 whiskers

Enamel–metal composite materials with high strength and corrosion resistance are often used for fabricating enameled pressure vessels for pharmaceutical and chemical production. However, the low bending resistance of the enamel can result in the cracking and delamination of the enamel layer, leading to the loss of corrosion resistance of the enameled pressure vessel, which can result in accidents. Here, based on the goal of increasing the bending resistance of the enamel to prolong its service life, the effect of β-Si₃N₄ whiskers on the mechanical properties of enamel was studied by three-point bending tests. The effect of β-Si₃N₄ whiskers on the acid and alkali corrosion resistance of enamel was studied using aqueous H₂SO₄ and NaOH solutions, respectively. A sudden change in the force of an enameled sample under the three-point bending test was used to evaluate the bending resistance of the enamel–metal samples, and can also be used to evaluate the mechanical properties of other comparable materials. With the addition of 0.5 wt% β-Si₃N₄ whiskers, the bending resistance was significantly improved, along with the acid and alkali corrosion resistance. These findings are expected to provide guidance for the design and production of enamel-metal vessels with improved performance that can significantly lengthen the service life of enameled pressure vessels and reduce the occurrence of accidents.     

Effect of partial substitution of alumina–chromium slag for Al2O3 on microstructures and properties of Al2O3–SiC–C trough castables

Alumina–chromium slag (ACS), a cheap and abundant refractory raw material comprising aluminum–chromium oxides and β-Al₂O₃, is a byproduct of ferrochrome smelting. For this reason, we investigated the relationships between composition and mechanical properties, abrasion resistance, oxidation resistance, and resistance to iron slag erosion for Al₂O₃–SiC–C trough castables in which ACS was substituted for alumina. Due to the presence of β-Al₂O₃ in ACS, the aluminum-chromium slag reacted with SiO₂ to form a low-melting phase of albite and promoted the formation of mullite, which filled the pores at high temperatures and reduced the porosity, thereby promoting densification and strengthening of the sample. The cold mechanical properties of the sample and the normal temperature wear resistance were enhanced, but the high-temperature mechanical properties and the resistance to iron slag corrosion of the sample were impaired. According to the results of the anti-oxidation experiment, the presence of β-Al₂O₃ in the ACS reduced the porosity and made the sample more dense, which remarkably improved oxidation resistance of the sample. For industrial production requirements, ACS substitution should not exceed 48?wt% due to of thermomechanical properties and anti-slag corrosion performance in Al₂O₃–SiC–C trough castables.     

Enhancement of thermal shock and slag corrosion resistance of MgO–ZrO2 ceramics by doping CeO2

The purpose of this paper was to develop ceramics materials with high thermal shock resistance and corrosion resistance for preparing gas blowing components. In this paper, MgO-rich MgO–ZrO₂ ceramics were obtained by using MgO powder and ZrO₂ powder as starting materials and CeO₂ as an additive. Changes in the properties in terms of thermal shock resistance, mechanical properties, and slag corrosion-resistance with chemical compositions were examined correlated to microstructure and phase changes. Especially, the effect of doping CeO₂ on phase transition of zirconia in MgO-rich system was discussed. The results showed that doping amount of CeO₂ significantly improved properties of MgO–ZrO₂ ceramics. Especially when doping amount of CeO₂ was 2 wt%, residual strength ratio was enhanced over 100% after thermal shock testing. In samples doped with CeO₂, ZrO₂ was stable in cubic or tetragonal form due to complete solution of CeO₂, which was important reason for the improvement of various properties of MgO–ZrO₂ ceramics.     

钢骨架塑料复合管的性能和应用

对钢骨架塑料复合管与其他管道的性能进行了比较,对比结果证明:钢骨架塑料复合管具有耐压、耐磨、耐腐蚀、抗蠕变、安装方便以及较高的性价比等特点。     

氧化镁-尖晶石浇注料的组成与性能的关系

以中档烧结镁砂、矾土基尖晶石和电熔白刚玉为主要原料,制备了不同基质组成的试样,并研究了浇注料的流动性、强度、永久线变化率、抗渣性和抗热震性。结果表明：基质的组成（特别是Ａｌ２Ｏ３／ＭｇＯ比）对浇注料的抗渣性、线变化率、抗剥落性和热震稳定性有显著影响,通过调整Ａｌ２Ｏ３／ＭｇＯ比可制得综合性能优良的氧化镁－尖晶石浇注料     

改善NR耐老化耐屈挠特性的研究概况

介绍了影响天然橡胶(NR)耐老化、耐屈挠特性的几个因素,分别综述了NR与BIIR,CIIR,BR,SBR,EPDM等胶料配合后的作用,以及防老剂、填料及其他因素对提高NR耐老化、耐屈挠特性的影响,总结了提高NR耐老化、耐屈挠特性的主要途径和方法及其相关方向的研究进展。     

硅树脂及其涂料的研究新进展

综述了近十年来国内外耐热、耐腐蚀、耐候性硅树脂、改性硅树脂及其涂料的研究新进展；指出了硅树脂及其涂料的发展趋势。     

类金刚石薄膜对Low-E膜系的保护作用分析

采用射频等离子体增强化学气相沉积法(RF-PECVD),在Low-E玻璃表面沉积类金刚石(DLC)薄膜作为保护层,通过耐洗刷试验和耐酸腐蚀试验研究了DLC薄膜对Low-E膜系的保护作用;同时对镀DLC薄膜的Low-E玻璃进行热处理,研究热处理后Low-E玻璃膜层结构、低辐射性能和光学性能的变化;然后通过摩擦磨损实验对镀DLC膜提高Low-E玻璃耐洗刷的原因进行分析。结果表明:DLC膜能够有效提高Low-E玻璃耐洗刷性和耐酸腐蚀性;并且DLC膜可以通过热处理去除,且热处理后的Low-E低辐射性能和光学性能未受到影响;一定厚度DLC膜能够有效降低Low-E玻璃摩擦系数,是提高Low-E玻璃耐磨性的主要原因。     

阻燃耐寒输送带的开发研制

介绍了阻燃耐寒输送带复盖胶料配方的设计和加工工艺，产品具有良好的阻燃性能，又有优异的耐寒性能，解决了北方冬季胶带变硬，打滑、龟裂甚至断带等事故发生，满足了我国北方寒冷地区矿山大运量，高速度输送固体物料的需要，填补了国内空白。