Overview
The silicone backbone is the fundamental structure of silicones, consisting of alternating silicon (Si) and oxygen (O) atoms with organic side groups (typically methyl or phenyl) attached to silicon. This unique inorganic-organic hybrid architecture combines the thermal stability of silica with the flexibility of organic polymers. First developed in the mid-20th century, silicones now serve critical roles across industries due to their exceptional durability under extreme temperatures (-115°C to 315°C) and resistance to environmental degradation. Unlike purely carbon-based polymers, the Si-O bond in the silicone backbone is 50% longer and has higher bond energy, enabling greater chain mobility and stability. The bond angle flexibility allows the polymer to remain elastic even at low temperatures. These properties make silicones indispensable in applications requiring long-term performance under harsh conditions.
Physical and Chemical Properties
Silicone backbones exhibit low surface energy (20–24 mN/m), resulting in water-repellent and release properties. Their thermal conductivity (~0.2 W/m·K) is higher than most organic polymers, aiding heat dissipation. The backbone's flexibility arises from the 143° Si-O-Si bond angle, which can rotate freely, unlike the rigid 110° C-O-C angle in ethers. Chemically, silicones resist oxidation, UV radiation, and many solvents due to the strength of Si-O bonds (452 kJ/mol) and the protective organic groups. However, strong acids/bases can cleave the backbone. Viscosity ranges from <100 cP for fluids to solid rubbers, controlled by chain length and crosslinking density. Dielectric strength (~20 kV/mm) and volume resistivity (10^13–10^15 Ω·cm) make them excellent electrical insulators.
Main Applications
In construction, silicone backbone-based sealants account for 30% of global usage, providing weatherproofing for glass facades and joints. Medical-grade silicones (with high-purity backbones) are used in implants, tubing, and wound care due to biocompatibility and sterilization resistance. The automotive industry relies on silicone gaskets and O-rings for engine components exposed to temperature cycles. Electronics utilize silicone backbones in encapsulation resins for LEDs and circuit boards, where thermal stability prevents yellowing. Personal care products (e.g., shampoos, cosmetics) incorporate volatile silicone fluids (cyclomethicones) for smooth texture. Emerging applications include soft robotics and stretchable electronics, leveraging the backbone's mechanical resilience.
Safety and Storage
Uncured silicone raw materials should be stored in sealed containers at 15–25°C to prevent moisture absorption or premature crosslinking. Inhibitors (e.g., tetramethyl tetravinyl cyclotetrasiloxane) are often added to extend shelf life (typically 6–12 months). Fire risks are low (autoignition temperature >400°C), but decomposition above 300°C may release silica fumes. Occupational exposure limits for silicone processing fumes are generally 10 mg/m³ (total particulate). Powdered forms require dust control measures. Spills should be contained with absorbents like vermiculite, not washed into waterways as micro-particles may persist. Disposal follows local regulations for siloxane-containing waste.
B2B Procurement Guide
Industrial buyers should specify: 1) Backbone length (degree of polymerization, affecting viscosity), 2) Organic substituent type (methyl for general purpose, phenyl for high-temperature stability), 3) Functionalization (e.g., vinyl groups for platinum-cure systems). Bulk orders (≥1 ton) typically cost 15–30% less than small batches. Quality certifications to verify include ISO 10993 for medical grades and UL 94 V-0 for flame-retardant types. Supply chain audits should confirm traceability of raw silicon metal (typically sourced from China, Norway, or Brazil). Lead times vary from 2 weeks for standard grades to 8 weeks for custom formulations. Just-in-time delivery is advisable due to shelf-life constraints.
Related Manufacturers
- 主营：除尘布袋、除尘滤袋、除尘器滤袋、袋笼骨架、除尘器布袋
- 主营：矿用风筒、矿用避难座椅、矿用气囊、有机硅除尘骨架、隧道风筒、压缩氧自救器、除尘布袋、压风自救装置、压风供水自救装置、供水自救装置、隔爆水槽、气水分离器、隔爆水袋
- 主营：除尘器、除尘布袋、耐高温除尘布袋、除尘骨架、镀锌除尘骨架、褶皱型骨架、有机硅骨架、木工除尘器、脉冲式除尘器、布袋除尘器、铸造厂除尘器、锅炉除尘器、氟美斯除尘布袋、高温布袋、防油布袋、PPS覆膜布袋、单机除尘器、燃煤锅炉除尘器、生物质锅炉除尘器、水泥厂除尘器、矿山除尘器、医药化学布袋除尘器、涤纶除尘布袋、防静电布袋、三防除尘布袋
- 主营：除尘器、螺旋输送机、卧式双轴粉尘加湿搅拌、有轴螺旋输送机、除尘骨架、通风蝶阀、除尘布袋、斗式提升机、光氧净化器、催化燃烧设备、布袋除尘器、蜂窝活性炭、电捕焦油器、焊烟净化器、不锈钢布袋除尘器、活性炭吸附箱、玻璃钢脱硫塔、打磨抛光工作台、刮板输送机、喷淋塔、除尘风机、无轴螺旋输送机、板链斗式提升机、PP喷淋塔、双轴加湿搅拌机
- 主营：高温布袋、玻纤布袋、除尘滤袋、布袋骨架、除尘布袋、氟美斯滤袋、涤纶针刺毡
- 主营：布袋除尘器、活性炭吸附箱、催化燃烧、除尘骨架、气旋塔、喷淋塔
- 主营：气箱脉冲除尘器、布袋除尘器、脉冲布袋除尘器、除尘骨架、催化燃烧设备、活性炭吸附箱、滤筒除尘器、喷淋塔、电捕焦油器、等离子净化器、旋风除尘器、除尘布袋、脉冲电磁阀、螺旋输送机、气旋塔、加湿机、打磨台、斗式提升机、喷漆房、塑烧板除尘器、脱硫塔、卸料器
- 主营：刮板机、卸料器、关风机、有机硅骨架、插板阀、通风蝶阀、水泥绞龙、仓顶除尘器、螺旋上料机、脉冲除尘器、旋风除尘器、绞龙上料机、螺旋给料机、皮带斗式提升机、板料斗式提升机、FU刮板输送机、管道火花捕捉器、布袋除尘器、滤筒除尘器、粉尘加湿搅拌机、不绣钢螺旋给料机、无轴螺旋输送机、垂直螺旋输送机、斗提机、埋刮板输送机
- 主营：提升机、搅拌机、散装机、弹簧骨架、输送机、插板阀、通风蝶阀、棒条阀门、除尘布袋、棒条闸阀、滤筒除尘器、星型卸料器、电动调风阀、埋刮板输送、旋转给料机、三通分料器、脉冲除尘器、布袋除尘器、重锤翻板卸灰阀、涡轮管道排风阀、电动锁风翻板阀
- 主营：电动污泥斗、电液动腭式阀、电液动插板阀、骨架、手动棒条阀、气动储泥斗、电液动平板闸门、手动插板阀、电动通风蝶阀、粉尘加湿机、重锤翻板阀、电液动三通分料器、气动换向阀、斗式提升机、电液动扇形阀、卸料器、刮料机、皮带机清扫装置、电动弧形阀、螺旋输送机、除尘器、布袋、压力释放阀、电动百叶阀、侧链卸灰阀
- 主营：刮板机、输送机、螺旋输送机、有机硅骨架、绞龙、螺旋给料机、布袋除尘器、管式螺旋、提升机、刮板输送机、关风机、链式输送机、粉尘加湿机、仓顶除尘器、斗式提升机、加湿搅拌机、通风蝶阀、板链提升机、旋风除尘器、绞龙输送机、星型卸料器、卸灰阀
- 主营：气处理、活性炭、插板阀、除尘器骨架、除尘布袋、电磁脉冲阀、滤筒除尘器、焊烟净化器、除尘雾炮机、拼接除尘器、脉冲电磁阀、布袋除尘器、螺旋输送机、木工除尘器、工业锅炉风机、催化燃烧设备、吸附脱附装置、废气除尘设备、光氧催化设备、不锈钢调节阀、离子除臭设备、中央除尘设备、工业防尘布袋、下料器卸灰阀、催化燃烧一体机
- 主营：除尘器、螺旋输送机、FU型刮板机、有机硅、斗式提升机、加湿搅拌机、星型卸料器、旋风分离器、插板阀、通风蝶阀
- 主营：不锈钢储罐、陶瓷过滤机、冷凝水回收装置、除尘器骨架、玻璃钢罐、冷凝器、离心机、压滤机
- 主营：除尘器、静电除尘设备、脉冲袋式收尘器、有机硅喷涂袋笼、单机袋除尘设备