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硅树脂对硅橡胶耐热性能的影响 总被引:4,自引:0,他引:4
用硅树脂对硅橡胶进行改性 ,研究了硅树脂及其含量对硅橡胶耐热性能的影响。通过热空气老化试验及热重法—差热分析表明 :其力学性能与热空气老化性能显著提高。经过 30 0℃× 48h热空气老化后 ,加入硅树脂的试样仍非常柔软 ,性能保持率达 80 %。 相似文献
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硅橡胶的耐热性能研究 总被引:10,自引:1,他引:10
采用4-5份过氧化二异丙苯作主硫化剂,2份2,5-二甲基-2,5-二叔丁基过氧化已烷作助硫化剂,40份沉淀法白炭黑作增强剂,11-15份氢氧化铁作耐热添加剂,可制备耐热温度为300℃的硅橡胶。实验结果表明,试样各项物理机械性能均达到标准要求。 相似文献
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以二月桂酸二丁基锡为促进剂、正硅酸乙酯为硫化剂、白炭黑和氧化铈为填料制备双组分室温硫化硅橡胶,研究了氧化铈用量对双组分室温硫化硅橡胶耐热性能的影响。结果表明,氧化铈能明显提高双组分室温硫化硅橡胶的耐热性能,且其用量为8份(质量,下同)时耐热效果较好。在250℃下经72 h热空气老化后,添加了8份氧化铈的双组分室温硫化硅橡胶拉伸强度和扯断伸长率的损失率都最小。添加6份氧化铈的双组分室温硫化硅橡胶的热分解温度较未添加者提高了25.5℃,氧化铈在400~510℃时抑制了硅橡胶的热失重行为。 相似文献
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含乙烯基硅树脂交联剂对硅橡胶热性能的影响 总被引:2,自引:0,他引:2
以混合氯硅烷及烷氧基硅烷的共缩聚制备了含乙烯基硅树脂(VSR),并将其作为高温硫化硅橡胶(HCSR)的交联剂。由于硅树脂的集中交联对成环降解的阻碍作用,所得硫化胶的热稳定性和老化性能得到提高,并且VSR中含有苯基单元时,所得硫化胶的热空气老化性能更好。 相似文献
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Heat‐curable silicone rubber (HCSR) was prepared by using vinyl‐containing silicone resin (VSR) as the crosslinking agent instead of polyvinylsilicone oil (C gum). Mechanical properties and crosslink density of the vulcanizates were measured. The results indicate that VSR is a good crosslinking agent for HCSR. The tensile strength, tearing strength, elongation at break, and hardness of the vulcanizate can reach 10.2 MPa, 29.1 kN/m, 720%, and 58 SHA, respectively. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 3123–3127, 2002; DOI 10.1002/app.10054 相似文献
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NQ硅树脂增强加成型室温硫化硅橡胶 总被引:11,自引:0,他引:11
研究了MQ硅树脂对加成型室温硫化硅橡胶的增强作用。结果表明,含乙烯基的MQ硅树脂对加成型室温硫化硅橡胶的增强作用明显,硅橡胶的透明性很好。硅橡胶的强度随着MQ硅树脂中乙烯基含量的增加先增加而后下降。SiH/SiCH=CH2(摩尔比)为1.2 ̄1.5时,硅橡胶具有较好的力学性能。 相似文献
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Shen Diao Shengyou Zhang Zhizhou Yang Shengyu Feng Changqiao Zhang Zhaohua Wang Guogang Wang 《应用聚合物科学杂志》2011,120(4):2440-2447
Two kinds of treated fumed silica were prepared by treatment with either tetraphenylphenyltriethoxysilane (TPHTS) or both tetraphenylphenyltriethoxysilane and hexamethyldisilazane (TPHMTS), and were used as reinforcing filler for silicone rubber. The resistance to irradiation of the silicone rubber obtained was investigated by gamma ray of dose 500 kGy in air. The mechanical properties and the average molecular weight between crosslinking points (Mc) of the silicone rubber were determined before and after irradiation. The results show that the fumed silica treated by tetraphenylphenyltriethoxysilane (TPHPHS) can effectively improve the radiation resistance of silicone rubber while the fumed silica treated by both tetraphenylphenyltriethoxysilane and hexamethyldisilazane (MMN) cannot only effectively improve the radiation resistance of silicone rubber but also has excellent reinforcing effect on silicone rubber. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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研究了羟基硅油和四甲基四乙烯基环四硅氧烷(V 4)对气相法白炭黑增强甲基乙烯基硅橡胶(VMQ)复合材料性能的影响。结果表明,在VMQ用量为100份、气相法白炭黑用量为40份时,加入羟基硅油可明显降低混炼胶的Payne效应,有效改善白炭黑的分散性;当其用量为5份时,复合材料的综合力学性能最优。在添加5份羟基硅油的基础上,加入V 4可显著提高VMQ复合材料的撕裂强度,其用量为4份时,撕裂强度可达42.2 k N/m。 相似文献
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Hongqiang Li Yanping Li Xuejun Lai Hongwei Cao Renxu Yuan Xingrong Zeng 《应用聚合物科学杂志》2019,136(15):47360
With the growing incidence of extreme climate and serious pollution, the capability to resist high-voltage arc discharge has been considered as one of crucial performances for silicone rubber in the field of electrical power. Herein, to enhance the tracking and erosion resistance of addition-cure liquid silicone rubber (ALSR), a kind of ureido-attached vinyl MQ silicone resin [hydrolytic condensation products of monofunctional silane (M) and tetrafunctional silane (Q)] (U-VMQ) was synthesized. The chemical structure of U-VMQ was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and the effects of U-VMQ on the mechanical properties, thermal stability, and tracking and erosion resistance of ALSR were investigated. The results showed that U-VMQ was beneficial for the improvement of mechanical properties and thermal stability of ALSR. With 2 phr of U-VMQ containing 2.5 wt % of vinyl content, the ALSR successfully passed the inclined plane tracking at 4.5 kV, and the electrical erosion rate was only 0.13%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47360. 相似文献
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含氢硅油固化剂的固化性能研究 总被引:1,自引:0,他引:1
研究了甲基含氢硅油和乙基舍氢硅油的不同用量、不同固化温度对乙烯基甲基苯基硅油固化性能的影响。研究发现,甲基含氢硅油作为固化剂使用时,活性高,但是条件控制不当时易导致固化不均匀,其使用性能没有乙基含氢硅油稳定. 相似文献