We know that the main raw material of cold-shrinkable cable accessories is silicone rubber, so what impact does the quality of this silicone rubber have on the quality of cold-shrinkable cable accessories? In fact, it mainly affects the physical and mechanical properties of the cold-shrinkable cable accessories and the ability to withstand tracking and leakage.

Generally speaking, the tensile and tear strength of ordinary silicone rubber is relatively low. If the tensile and tear resistance of silicone rubber is to be increased, the elongation will be reduced and the hardness will be increased. It is used to manufacture cold-shrinkable electrical cables. The attached silicone rubber requires high strength elongation, low hardness, and high tensile tear strength, that is, 800% elongation, 45 Shore A hardness, and 10MPa tensile strength. Tear reaches 30kN / m.

Generally, the method for improving the tracking resistance of silicone rubber is to add a large amount of aluminum hydroxide; however, after adding a large amount of these fillers, the hardness of the silicone rubber will be increased and the elasticity will be reduced. Guangzhou Kehong Electronics Co., Ltd. has developed advanced technology to make the tracking resistance of electricity leakage reach level 4.5 without affecting the hardness, elasticity and expansion ability of silicone rubber. In addition, this technology also makes silicone rubber have a strong hydrophobicity. Rainwater drips on the cold-shrinkable cable terminals made by it. It can neither adhere to the film nor form conductive channels; instead, it can wash away the surface Grey layer. That is, it can significantly improve the electrical performance of cold-shrinkable cable terminations, and the application and exploration of heat-shrinkable cable accessories to achieve a relatively large flashover distance in a relatively short dark group.

原材料对冷缩电缆附件的性能的影响

我们知道冷缩电缆附件的主要原材料就是硅橡胶，那么这个硅橡胶的质量对冷缩电缆附件的质量究竟有哪些影响呢？其实主要是影响了冷缩电缆附件的物理机械性能、耐漏电起痕能力等等。

一般而言，普通硅橡胶的拉伸和撕裂强度比较低、若要提高硅橡胶的抗张抗撕能力，伸长率就会下降，硬度就会上升；而用于制造冷缩电式电缆附件的硅橡胶，要求同时具有强度很高的伸长率、较低的硬度和很高的抗张抗撕强度，即伸长率800%、邵氏A硬度45度、拉伸强度达到10MPa、撕裂达到30kN/m。

通常提高硅橡胶耐漏电起痕能力的方法是大量添加氢氧化铝；然而，大量添加这些填料之后，必然会提高硅橡胶的硬度、使弹性降低。广州柯鸿电子有限公司已经开发出先进技术在不影响硅橡胶硬度、弹性、扩张能力前提下，使耐漏电起痕能力达到4.5级。而且这种技术还使得硅橡胶具有很强的憎水能力，雨水淋在其制造的冷缩电缆终端上，既不能沾附成膜，也不不会形成导电通道；反而能冲刷掉其表面的灰层。即能显著提高冷缩电缆终端头的电气性能，热缩电缆附件的应用及探索在相对短的暗组昂尺寸内实现相对大的漏闪距离。

KeHong Enterprises Co.,Ltd.
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E -mail：gavin@gzhelectric.com
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