Surface Coated Silica
Overview
Surface-coated silica consists of silica particles (SiO2) modified with organic or inorganic coatings to alter surface properties. Common coatings include silanes, polymers, or fatty acids, which impart functionalities like hydrophobicity or improved adhesion. This treatment addresses challenges like particle agglomeration and incompatibility with non-polar matrices, making it versatile for industrial applications. The technology behind surface coating allows precise control over silica's interaction with other materials. For instance, hydrophobic coatings prevent moisture absorption in rubber composites, while hydrophilic variants enhance dispersion in water-based systems. The choice of coating depends on the end-use requirements, balancing cost and performance.
Physical and Chemical Properties
The base silica retains its high thermal stability and chemical inertness, but the coating modifies surface characteristics. For example, silane-coated silica exhibits reduced surface energy, improving compatibility with polymers. Particle size typically ranges from 5 nm to 20 μm, with specific surface areas of 50–400 m²/g. Coating thickness is critical—too thin may fail to prevent agglomeration, while excessive coating can hinder performance. Analytical techniques like FTIR or TGA verify coating uniformity. The treated silica often shows lower bulk density than unmodified variants due to reduced particle clustering.
Main Applications
In paints and coatings, coated silica acts as a rheology modifier and anti-settling agent. Its tailored surface ensures even dispersion, reducing viscosity fluctuations. The rubber industry uses it to reinforce tires, where hydrophobic coatings improve filler-elastomer bonding, enhancing durability and reducing rolling resistance. Adhesives and sealants benefit from improved wetting and reduced shrinkage. In cosmetics, coated silica provides matting effects or SPF enhancement in sunscreens. Emerging uses include battery separators and 3D printing powders, where surface engineering optimizes performance.
Safety and Storage
While silica itself is generally low-toxicity, coatings may introduce hazards (e.g., flammable silanes). Dust inhalation risks require precautions like NIOSH-certified respirators and local exhaust ventilation. Spills should be contained to prevent slipping hazards. Storage recommendations include sealed containers in dry environments to prevent moisture-induced caking. Coated silica is often less hygroscopic than untreated forms but may still degrade if exposed to prolonged humidity. Compatibility with other chemicals depends on the coating—consult SDS for specific variants.
B2B Procurement Guide
Buyers should prioritize suppliers that provide technical datasheets specifying coating type (e.g., octylsilane, amino), particle size distribution, and residual solvent levels. Batch-to-batch consistency is critical for industrial applications; request certificates of analysis and samples for testing. Bulk pricing tiers apply for quantities over 1 ton, with discounts up to 20%. Lead times vary; specialty coatings may require 4–8 weeks. Consider logistics—bagged shipments (25 kg) vs. bulk silos—to match your handling capabilities. For niche applications, custom coatings are feasible at higher costs.
Related Manufacturers
- 主营：聚乙烯蜡、朗盛抗静电剂、进口增韧剂MBS、表面包覆处理硅土、巴斯夫聚乙烯蜡、霍尼韦尔聚乙烯蜡、国际化学(原科莱恩)抗静电剂、科慕钛白粉、泛能拓硫化锌、泛能拓钛白粉、特诺钛白粉、巴斯夫抗氧剂、巴斯夫光稳定剂、花王扩散粉EBS、印尼扩散粉EBS、三益硬脂酸锌SAK-ZS-PLB、三益硬脂酸钙SAK-CS-P、禾大油酸酰胺芥酸酰胺、陶氏加工助剂系列、进口白炭黑、钛白粉TR52、三菱丽阳PC、涂料用钛白粉、热稳定剂、氧化聚乙烯蜡
- 主营：石墨、膨胀石墨、导电石墨粉、防静电墨粉、阻燃石墨粉、鳞片石墨粉、超细石墨粉、云母、云母片、茶色云母片、云母粉、电气石、电气石粉、电气石颗粒、天然云母片、透明云母片、导热石墨、绝缘云母片、耐高温云母、云母板、岩片、贝壳片、膨润土、钙基膨润土、纳基膨润土
- 主营：超细硅酸铝粉、硅藻土、膨润土、高岭土、滑石粉、彩砂、透明粉、白炭黑、金刚砂、石墨、海泡石、木粉、轻钙、重钙、玻璃粉、贝壳粉、凹凸棒土、玻璃鳞片、陶土、铝矾土、火山岩、电气石粉、合成云母、赤铁粉
- 主营：高岭土、玻璃鳞片、轻钙、空心玻璃微珠、氢氧化铝、S95矿粉
- 主营：对辊机、低温粉碎、马赛克陶瓷、气流分级机、气流粉碎机、高速混合机、气流分级系统、气流粉碎系统、高速混合系统机
- 主营：白矿油、10号白油、15号白油、万泰硅土GW、26号白油、32号白油、石蜡基油、橡胶油、环烷油、黄油、超细白炭黑、白炭黑、促进剂、环保颗粒助剂、防老剂、增塑剂、氧化锌、硬脂酸、3L标胶、高苯橡胶、丁二烯橡胶、消光粉、超细二氧化硅、天然橡胶
- 主营：二氧化硒、硫氰酸钠、对甲苯磺酸、九水硫化钠、硫化钡、氢氧化钡、苯甲酰氯、三硫代碳酸钠、还原铁粉、氟硅酸铵、氟化钾、黄血盐钾、氟化钠、黄血盐钠、过氧化苯甲酰、AC发泡剂、异丙醇铝、4-对二氯苄、多硫化钠、铁氰化钾、对苯二甲酸二甲酯、5-羟甲基糠醛、丙酮肟、聚六亚甲基胍盐酸盐、铁粉
- 主营：高铝砖、粘土砖、耐火球、浇注料、耐火泥、轻质保温砖、莫来石刚玉砖、氧化铝空心球砖、耐火砖
- 主营：云母粉、蛭石粉、膨润土、硅藻土、电气石、云母片、麦饭石、石英砂、重晶石、sio2焊条、发热铁砂、耐火漂珠、煅烧沸石、防火涂料、膨胀蛭石、空心漂珠、涂料彩砂、生蛭石片、白色蛭石、实木木粉、染色彩砂、火山熔岩、晶体电介质、滤料鹅卵石、生物质燃料
- 主营：云母碎、贝壳粉、芙蓉红、红外线、萤石球、石英粉、火山石、电气石、莫来砂、金云母、蛭石片、鹅卵石、雪花白、石英砂、杨木粉、保温海、萤石矿、起重机、目木粉、水洗砂、重铁砂、贝壳彩片、萤石粉、硅藻土
- 主营：氧化铁颜料、空心玻璃微珠、玻璃砂、儿童娱乐沙、油田压裂支撑剂、玻璃轻石、高岭土、白云石、凹凸棒土、火山石、喜马拉雅盐、金刚砂、金属砂、矿物纤维、硅酸铝纤维、石英砂、矿渣粉、莫来砂、生物质燃烧颗粒、膨润土、重晶石、彩石子、水晶石系列、远红外系列
- 主营：黄丹粉、柠檬酸、导热油、漂白粉、707乳液、氧化铝、氯化钙、木质素、防腐剂、除锈剂、防锈剂、酒石酸、抗氧剂、松香工业、碳酸氢铵、醋酸铅、碳酸铅
- 主营：全氟聚醚二醇、全氟三丁胺、聚硅氮烷、特种硅油、特种硅树脂
- 主营：石英发售、橡胶塑料轻钙
- 主营：云母、高岭土、氧化铁颜料、白炭黑、火山石、绿沸石、陶瓷砂、麦饭石陶瓷球、海泡石、石墨、硅藻土、碳化稻壳、贝壳粉、玻璃砂玻璃砂、松树皮、有机覆盖物、蛭石、椰糠椰壳砖营养土、仿瓷颗粒砂、莫来砂、复合岩片贝壳彩片、电气石、玛瑙石珠、还原铁粉铁砂