Introduction to organic silica gel
among organosilicon polymers, high molecular organosilicon compounds with silicon oxygen bond as main chain structure are mainly formed by hydrolysis polycondensation of organosilicon monomers (such as organohalosilanes). the main chain is composed of silicon oxygen bonds, and the side chain is connected with organic groups through silicon atoms, which is called polyorganosiloxane.
silicone resin is a kind of thermosetting resin with low molecular weight in polysiloxane. the glass fiber reinforced composite made of this kind of resin can still maintain excellent electrical properties in a high temperature range (200 ~ 250 ℃) after long-term continuous use. at the same time, it also has good arc resistance, hydrophobic and moisture-proof properties. the properties of silicone resin are as follows:
(1) thermal stability. the si-o bond of silicone resin has high bond energy (363kj / mol), so it is relatively stable and has high heat resistance and high temperature resistance. generally speaking, its thermal stability range can reach 200 ~ 250 ℃, and special types of resins can be higher.
(2) mechanical properties. the mechanical properties of silicone resin after curing are not high. if chlorophenyl is introduced into the macromolecular main chain, the mechanical properties can be improved. the bonding strength of silicone resin glass fiber laminate is poor, and the bending strength decreases greatly when heated. if phenylene is introduced into the main chain, the rigidity, strength and service temperature can be improved.
(3) electrical performance. silicone resin has excellent electrical insulation performance, and its breakdown strength, high voltage arc resistance and spark resistance are excellent. under the action of electric arc and spark, even if the resin is cracked to remove organic groups, the remaining silica on the surface also has good dielectric properties.
(4) hydrophobicity. the water absorption of silicone resin is very low, and water droplets can only roll down on its surface instead of wetting. therefore, silicone resin glass fiber reinforced composites can still maintain their excellent properties under humid environmental conditions.
(5) corrosion resistance. silicone resin glass fiber reinforced composites can be made of 10% ~ 30% sulfuric acid, 10% hydrochloric acid, 10% ~ 15% sodium hydroxide, 2% sodium carbonate and 3% hydrogen peroxide. alcohols, aliphatic hydrocarbons and lubricating oils have little effect on it, but their resistance to concentrated sulfuric acid is poor.
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Introduction to organic silica gel
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silicone resin is a kind of thermosetting resin with low molecular weight in polysiloxane. the glass fiber reinforced composite made of this kind of resin can still maintain excellent electrical properties in a high temperature range (200 ~ 250 ℃) after long-term continuous use. at the same time, it also has good arc resistance, hydrophobic and moisture-proof properties. the properties of silicone resin are as follows:
(1) thermal stability. the si-o bond of silicone resin has high bond energy (363kj / mol), so it is relatively stable and has high heat resistance and high temperature resistance. generally speaking, its thermal stability range can reach 200 ~ 250 ℃, and special types of resins can be higher.
(2) mechanical properties. the mechanical properties of silicone resin after curing are not high. if chlorophenyl is introduced into the macromolecular main chain, the mechanical properties can be improved. the bonding strength of silicone resin glass fiber laminate is poor, and the bending strength decreases greatly when heated. if phenylene is introduced into the main chain, the rigidity, strength and service temperature can be improved.
(3) electrical performance. silicone resin has excellent electrical insulation performance, and its breakdown strength, high voltage arc resistance and spark resistance are excellent. under the action of electric arc and spark, even if the resin is cracked to remove organic groups, the remaining silica on the surface also has good dielectric properties.
(4) hydrophobicity. the water absorption of silicone resin is very low, and water droplets can only roll down on its surface instead of wetting. therefore, silicone resin glass fiber reinforced composites can still maintain their excellent properties under humid environmental conditions.
(5) corrosion resistance. silicone resin glass fiber reinforced composites can be made of 10% ~ 30% sulfuric acid, 10% hydrochloric acid, 10% ~ 15% sodium hydroxide, 2% sodium carbonate and 3% hydrogen peroxide. alcohols, aliphatic hydrocarbons and lubricating oils have little effect on it, but their resistance to concentrated sulfuric acid is poor.
双面数控车床可同时加工两头，精度好
细数无人机在建筑行业中的具体应用
如何正确使用伊顿威格士控制阀及产品日常维护
防火涂层板耐高温可达多少度
气体流量计常见有哪些?
Introduction to organic silica gel
泥浆粘度计结构简要说明
水性色浆怎么用？水性色浆厂家
金属材料的机械性能介绍：
新品推荐|链霉亲和素包被板
环氧层压板的质量如何判断
微生物限度检测仪操作说明
胶体磨应用范围
紫外老化箱光源系统及灯管替换方法
高职院校汽车专业实训教学的问题与对策分析
台式次氯酸钠浓度测试仪M399607
仪器行业并购不断 生命科学领域热度不减
高压试验变压器使用注意事项
空间消毒如何选择臭氧，计算公式（仅供参考）
南康市乡镇生活污水处理设备厂家