过氧化物与硫黄共硫化氢化丁腈橡胶的性能研究

研究过氧化物/硫黄复合硫化体系对氢化丁腈橡胶(HNBR)性能的影响。结果表明:随着硫化剂DCP用量的增大,胶料的焦烧时间缩短,硫化速度加快,硫化胶的100%定伸应力增大,压缩永久变形减小,耐热老化性能提高;随着硫黄用量的增大,胶料的硫化速度加快,硫化胶的粘合性能提高;促进剂CZ用量对HNBR胶料性能的影响不大;当硫化剂DCP/硫黄/促进剂CZ用量比为7/0.5/1时,HNBR胶料的综合性能最佳。     

硫化体系对丁腈橡胶/氢化丁腈橡胶并用胶性能的影响

研究硫化体系对丁腈橡胶(NBR)/氢化丁腈橡胶(HNBR)并用胶性能的影响。结果表明:过氧化二异丙苯(DCP)/三烯丙基异氰脲酸酯(TAIC)硫化体系胶料的t_(10)较长,加工安全性、物理性能、耐热老化性能和耐介质性能较好,压缩永久变形较小;硫化剂DTDM/促进剂TMTD/促进剂CZ硫化体系胶料的t_(10)较短,撕裂强度较高;硫黄/DCP/促进剂TMTD/促进剂CZ硫化体系胶料的t90较短,硫化速度较快,100%定伸应力和拉伸强度较高。     

硫化体系对混炼型聚氨酯弹性体性能的影响

以聚醚多元醇和二苯基甲烷二异氰酸酯为单体,α-烯丙基甘油醚为扩链剂合成了混炼型聚氨酯（MPU）,研究硫黄硫化体系和过氧化物[过氧化二异丙苯（DCP）]硫化体系对MPU胶料性能的影响。结果表明：随着硫黄和DCP用量的增大,MPU胶料的t90略微延长,硫黄硫化体系的MPU胶料的t90短于DCP硫化体系的MPU胶料;随着硫黄和DCP用量的增大,硫黄硫化体系和过氧化物硫化体系的MPU硫化胶的100%定伸应力增大,拉伸强度先增大后减小,拉断伸长率减小;与DCP硫化体系的MPU硫化胶相比,硫黄硫化体系的MPU硫化胶的拉伸强度和拉断伸长率较大,综合拉伸性能较好;DCP硫化体系的MPU硫化胶的交联密度远大于硫黄硫化体系的MPU硫化胶;当硫黄用量超过1.5份时,MPU硫化胶出现喷霜现象。     

硫化体系对氢化丁腈橡胶性能的影响

研究硫化体系对氢化丁腈橡胶（HNBR）胶料性能的影响.结果表明,HNBR胶料采用硫黄/过氧化物硫化体系较为合适;随硫黄/过氧化物硫化体系中硫化剂DCP用量的增大,HNBR硫化胶300%定伸应力和拉断强度增大,拉断伸长率、拉断永久变形和撕裂强度减小,硫化剂DCP用量为5～7份时,HNBR综合性能较好.     

硫化体系对CM/NR并用胶性能的影响

研究6种硫化体系对氯化聚乙烯橡胶(CM)/NR并用胶性能的影响.结果表明,硫黄/过氧化物并用硫化体系胶料具有合适的焦烧时间和正硫化时间以及较好的物理性能.在硫黄/过氧化物并用硫化体系中,随着硫黄用量增大,CM/NR并用胶的焦烧时间呈稍微增大趋势,正硫化时间呈现缩短趋势,同时物理性能和耐热空气老化性能等呈现不同的变化规律,当硫黄用量为0.6～1.2份时,胶料的综合物理性能较好.     

硫化体系对氢化丁腈橡胶性能的影响

研究了硫黄硫化体系、过氧化物硫化体系、硫黄/过氧化物复合硫化体系对氢化丁腈橡胶(HNBR)硫化特性及力学性能、压缩永久变形和耐热氧老化性能的影响。结果表明,硫黄硫化胶力学性能和压缩永久变形较好;当DCP用量为4~5份时,HNBR硫化胶力学性能和耐热氧老化性能达到最优;在3种硫化体系中,硫黄/过氧化物复合硫化体系有利于提高硫化胶拉断伸长率和撕裂强度。     

甲基丙烯酸铈补强天然橡胶的性能研究

研究甲基丙烯酸铈对采用硫黄/过氧化物复合硫化体系的天然橡胶(NR)性能的影响。结果表明:当甲基丙烯酸铈用量为5份、硫黄和硫化剂DCP用量均为1.5份时,硫化胶的拉伸强度最大;甲基丙烯酸铈在NR基体中的分散性良好;与未添加甲基丙烯酸铈的NR硫化胶相比,添加甲基丙烯酸铈的NR硫化胶的拉伸强度、拉断伸长率和撕裂强度增大,耐热空气老化性能改善。     

高层级农业轮胎胎面胶配方的优化

对高层级农业轮胎胎面胶的配方进行优化。试验结果表明：在胎面胶配方中,生胶体系采用天然橡胶/丁苯橡胶1500E并用胶（并用比为30/70）,补强体系采用60份炭黑N220,增加7份粘合树脂,并适当调整防老剂、硫黄和促进剂用量,优化后胶料的门尼焦烧时间略有延长,FL和Fmax增大;硫化胶的耐磨性能和耐老化性能提高,成品轮胎的耐臭氧老化、耐龟裂和耐磨性能显著提高。     

硫黄/DCP并用硫化体系对NR胶料抗硫化返原性能的影响

研究硫黄／DCP并用硫化体系对NR胶料抗硫化返原性能、硫化胶物理性能及耐热老化性能的影响，并与相应的平衡硫化体系进行对比。结果表明，在NR硫黄硫化体系中加入1～2份硫化剂DCP，当硫化温度低于160℃时，胶料的抗硫化返原性能与相应的平衡硫化体系胶料相当；随着硫化温度的升高，胶料的抗硫化返原性能下降；对硫化胶的综合物理性能无不良影响，可略提高硫化胶的耐热老化性能。     

硫化体系对氢化丁腈胶热氧老化性能的影响

系统研究了不同硫化体系对氢化丁腈胶（HNBR）力学性能和热氧老化性能的影响。结果表明：采用过氧化物/硫磺（S）体系得到的胶料其综合性能优于过氧化物体系得到的胶料,在100份HNBR中加入5份过氧化二异丙苯（DCP）和0.5份S,即DCP与S并用时,硫化胶拉伸强度可以达到23.85 MPa,在160℃×72 h热氧老化后仍可以达到20.99 MPa。热氧老化性能以DCP/S为7/0.5时最为优异。     

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.     

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     

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。     

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。     

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。     

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。