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Environmental characteristics of the conductive properties of rubber

Theoretically well coated metal filler. However,[link widoczny dla zalogowanych], there are a lot of metal filler, there is always a small amount of local exposure to particles in the material surface. In the salt spray environment, NaCl electrolyte solution is easy to form the environment; the other hand, in the mold test gold test in Figure 4 SEM images of surface Fig. 4SEMphotographofthesamplesurfacea {termouldtesting there is a filler in other trace metal impurities, making the electrode potential in the system are different metal elements, resulting in potential difference. The existence of these two factors, the electrochemical corrosion in the material surface. On the performance of the macro specimen surface caused the cracks, while the volume resistivity decreased. It can be seen from Figure 4, after the mold surface after corrosion color deepened, and there is visible mold. From the mechanism of the analysis, the relative humidity is greater than 65, the surface adsorption by capillary will have a layer of uniform and thin film of water, coupled with the cyclical changes in temperature, condensation will form. The same salt spray corrosion mechanism of the above, but also the formation of electrochemical corrosion. Because the lower the acidity of water, weak electrolyte, so the corrosion to a lesser extent, do not form cracks, and only the color change caused by surface and volume resistivity decreased. 2.2 The mechanical properties of tensile strength and elongation after fracture is conductive rubber material of the two important mechanical properties. Table 1 shows that the environmental performance through the test, the tensile strength and elongation rate did not change significantly, in which hot air aging test and performance test mold tensile strength and elongation after fracture, after a slight increase or decrease, while the salt fog tests were declined. In general, high temperature and oxygen in the common role of an aging silicone rubber occurs. Main functional groups of the oxidation and degradation of the main chain cleavage __4]. However, thermal aging and mechanical properties of mold performance test after test results, did not change significantly, indicating that the study of silicone rubber used in better performance in the test cycle,[link widoczny dla zalogowanych], no obvious degradation reaction. The salt spray test is reduced to some extent the tensile strength of the material system and the percentage elongation. This was mainly due to the previously mentioned electrochemical corrosion damage the integrity of the material surface, resulting in decreased mechanical properties. 3 Conclusions (1) hot air aging test, salt spray test after test 348 and mold surface appearance changed, and the volume resistivity increased,[link widoczny dla zalogowanych], especially the most obvious impact of salt spray test. (2) The salt spray test the material's tensile strength and elongation rate decreased, but after hot air aging test, and mold test the performance did not change significantly. Reference: Ell Zhao positive. Stable electrical properties of conductive rubber EJ]. World Rubber Industry, 2004,31 (3) :45 - 47. [2] Xie Quan, Luo Jiaolian. Conductive silicone rubber compound resistance-temperature characteristics [J]. Physics, 2000,49 (6) :1191-1195. [3] Jie Sheng-Yu Feng. Advances in conductive silicone rubber theory [J]. Functional Polymers, 2002 (3) :87-9O. [4] Fuqiu Lan, Wu Xiangrong. Condensation-type RTV silicone rubber heat resistance of the research progress [J]. Organic silicon material, 2003,17 (1) :28-3l_ on launching material physical properties (microstructure examination) professional qualification examination and training testers notice physical properties of materials (metallurgical test) professional qualification examination and training testers opening soon . This issue mainly engaged in the mechanical properties and microstructure aspects of the '7 inspection beta 4 test, test, test and inspection personnel-based. Taught to apply the main line, theory, content and practical, drawing broad, covering the metallographic examination of all should know should be the basis of expertise. Physical properties (microstructure examination) test points advanced vocational qualification training personnel, intermediate and junior three, after the training operation by the technical theory and skills of passing the examination by the Ministry of Labour and Social Security,[link widoczny dla zalogowanych], the State Quality and Technical Supervision Guidance Center Occupational Skill Testing physical performance test materials issued \Details on registration and evaluation, etc., it may result to the application of Measurement and Testing Technology, Nanjing Development Center. Welcome to all enterprises and institutions,[link widoczny dla zalogowanych], universities, research institutes and relevant units to actively register. Training and other relevant information with the claim notice is sent. And can be [link widoczny dla zalogowanych] china-geyan. corn in the \Phone :025 -84480505, 84480506,84490505; Fax :025 -84580972; Address: Jiefang Road, Nanjing, 9; Postal Code: 210016. Measurement and Testing Technology, Nanjing results Application Development Center

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