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有机硅性能

网址:  2019-04-26  作者:admin    阅读:

有机硅胶产品的基本结构单元是由硅-氧链节构成的,侧链则通过硅原子与其他各种有机基团相连。因此,在有机硅产品的结构中既含有"有机基团",又含有"无机结构",这种特殊的组成和分子结构使它集有机物的特性与无机物的功能于一身。与其他高分子材料相比,有机硅产品的最突出性能是:
The basic structural unit of organosilicon gel products is composed of silicon-oxygen chains, and the side chains are connected with other organic groups through silicon atoms. Therefore, the structure of organic silicon products contains both "organic group" and "inorganic structure". This special composition and molecular structure makes it integrate the characteristics of organic matter and the functions of inorganic matter. Compared with other macromolecule materials, the most outstanding properties of silicone products are:
1.耐温特性
1. Temperature Resistance
有机硅产品是以硅-氧(Si-O)键为主链结构的,C-C键的键能为82.6千卡/克分子,Si-O键的键能在有机硅中为121千卡/克分子,所以有机硅产品的热稳定性高,高温下(或辐射照射)分子的化学键不断裂、不分解。有机硅不但可耐高温,而且也耐低温,可在一个很宽的温度范围内使用。无论是化学性能还是物理机械性能,随温度的变化都很小。
Silicone products are mainly composed of silicon-oxygen (Si-O) bond. The bond energy of C-C bond is 82.6 kcal/molecule. The bond energy of Si-O bond is 121 kcal/molecule in silicone. Therefore, the penlinguan.37ix.com.cnweikuangg.37ix.com.cnuxingcao.37ix.com.cnwww.rerongjiaoji.org.cnthermal www.dianjiareguan.net.cnwww.yanglaoyuant.cnstability of silicone products is high, and the chemical bonds of silicone molecules continue to split and not decompose at high temperature (or irradiation).  Both chemical and physical mechanical properties vary little with temperature.
2.耐候性
2. Weatherability
有机硅产品的主链为-Si-O-,无双键存在,因此不易被紫外光和臭氧所分解。有机硅具有比其他高分子材料更好的热稳定性以及耐辐照和耐候能力。有机硅中自然环境下的使用寿命可达几十年。
The main chain of organosilicon products is-Si-O-, and there is no double bond, so it is not easy to be decomposed by ultraviolet light and ozone. Silicone has better thermal stability, radiation and weather resistance than other polymer materials. The service life of organic silicon in natural environment can reach several decades.
3.电气绝缘性能
3. Electrical Insulation Performance
有机硅产品都具有良好的电绝缘性能,其介电损耗、耐电压、耐电弧、耐电晕、体积电阻系数和表面电阻系数等均在绝缘材料中名列前茅,而且它们的电气性能受温度和频率的影响很小。因此,它们是一种稳定的电绝缘材料,被广泛应用于电子、电气工业上。有机硅除了具有优良的耐热性外,还具有优异的拒水性,这是电气设备在湿态条件下使用具有高可靠性的保障。
Silicone products all have good electrical insulation properties. Their dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistance coefficient and surface resistance coefficient are among the top insulating materials, and their electrical properties are little affected by temperature and frequency. Therefore, they are a kind of stable electrical insulation materials, which are widely used in the electronic and electrical industries. In addition to excellent heat resistance, organosilicon also has excellent water repellency, which is the guarantee of high reliability of electrical equipment in wet condition.
4.生理惰性
4. Physiological inertia
聚硅氧烷类化合物是已知的最无活性的化合物中的一种。它们十分耐生物老化,与动物体无排异反应,并具有较好的抗凝血性能。
Polysiloxanes are one of the most inactive compounds known. They are very resistant to biological aging, have no rejection reaction with animals, and have good anticoagulant properties.
5.低表面张力和低表面能
5. Low surface tension and low surface energy
有机硅的主链十分柔顺,其分子间的作用力比碳氢化合物要弱得多,因此,比同分子量的碳氢化合物粘度低,表面张力弱,表面能小,成膜能力强。这种低表面张力和低表面能是它获得多方面应用的主要原因:疏水、消泡、泡沫稳定、防粘、润滑、上光等各项优异性能。
The main chain of organosilicon is very flexible. The intermolecular force of organosilicon is much weaker than that of hydrocarbons. Therefore, the viscosity of organosilicon is lower than that of hydrocarbons with the same molecular weight, the surface tension is weaker, the surface energy is smaller and the film forming ability is stronger. This low surface tension and low surface energy are the main reasons for its application in many ways: hydrophobic, defoaming, foam stabilization, anti sticking, lubrication, polishing and other excellent properties.

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