sílice de energía hidrofóbica

Los defoamers son actualmente un aditivo ampliamente utilizado, que juega un papel importante en varios campos, como alimentos, petroquímicos, fabricación de papel y limpieza industrial. Entre ellos, los desacopladores de silicona son los productos de defoamer más utilizados y consumidos. Otros tipos de desajuste, como el aceite mineral y el poliéter, complementan las aplicaciones de los desacopladores a base de silicona. Los componentes principales de los desalentadores de silicona incluyen pasta de silicona, emulsionantes y espesantes, siendo la pasta de silicona el ingrediente activo en los defoamers de silicona. La pasta de silicona se compone principalmente de aceite de silicona (o aceite mineral, aceite vegetal, etc.) y sílice. Como un componente esencial de los defoamers, la sílice juega un papel crucial.Tomando un desalentador con aceite de dimetil silicona como base de pasta de silicona como ejemplo, debido a la mala dispersión y la baja solubilidad del aceite de dimetil silicona en los sistemas de emulsión, es necesario usar sílice (negro de carbono blanco) o varios emulsionantes para mejorar su dispersión. Los grupos de silanol en negro de carbono blanco pueden formar enlaces de hidrógeno con agua, aumentando la viscosidad del sistema, logrando un efecto engrosamiento y promoviendo la dispersión y estabilidad del desalitud. Debido al pequeño tamaño de partícula, una gran área de superficie específica y alta energía superficial de negro de carbono blanco, puede generar una fuerza significativa para las burbujas de adsorbe. Junto con el aceite de silicona, forma una fuerza que ataca burbujas, creando puntos débiles. Bajo la baja tensión superficial del aceite de silicona, las burbujas se rompen, lo que lleva a la desfoaming. Este es el principio general de cómo funcionan los defoamers. En resumen, el negro de carbono blanco sirve principalmente para espesar, dispersar y adsorbar burbujas en defoamers. El negro de carbono blanco hidrofílico tiene una mala compatibilidad con el aceite de silicona, mientras que el negro de carbono blanco hidrofóbico, después de la modificación de la superficie, puede estar bien humedecido y disperso en los sistemas de aceite de silicona debido a su hidrofobicidad.El método de preparación de los defoamers implica principalmente dos pasos. El primer paso es la preparación de pasta de silicona, que implica la dispersión y reacción de negro de carbono blanco en aceite de silicona. El segundo paso implica agregar emulsionantes, espesantes y otros aditivos para emulsionar y dispersar la pasta de silicona en una emulsión, que luego se puede diluir según sea necesario para preparar desenguradores de diferentes concentraciones. El negro de carbono blanco se puede dividir en dos tipos basados en procesos de producción: negro de carbono blanco precipitado y negro de carbono blanco. La ventaja del negro de carbono blanco precipitado se encuentra en su bajo costo, pero debido a su mayor tamaño de partícula, es propenso a la sedimentación, lo que puede conducir a la obstrucción de filtros en muchas aplicaciones de desacoplador. Por el contrario, el negro de carbono blanco con humo tiene un tamaño de partícula más pequeño, mejores propiedades de suspensión, buena compatibilidad con los emulsionantes, requiere menos cantidad aditiva y tiene excelentes propiedades de espesamiento y antisedimentación. Además, el negro de carbono blanco que se ha sometido a una modificación hidrofóbica inherentemente posee ciertas propiedades de desfoaming, lo que lo convierte en una solución ideal para los problemas que enfrentan el negro de carbono blanco precipitado en aplicaciones de desacopladores. A medida que disminuye el precio del negro de carbono blanco, su rentabilidad en los desacopladores se volverá aún más prominente, lo que lo convierte en una excelente opción para los defoamers.En este contexto, Geseesil 200, un producto de sílice hidrofílica de Gesee nuevos materiales, se destaca como una opción de alta calidad para las formulaciones de defoamer. Para más información, visite www.geseesesiltech.com

Introduction MTCS Modified Fumed Silica is a type of hydrophobic fumed silica produced by chemically treating the surface of hydrophilic fumed silica with methyltrichlorosilane (MTCS). Through this modification process, reactive silanol groups (-SiOH) on the silica surface are replaced by hydrophobic methyl groups (-CH₃), significantly reducing moisture absorption and improving compatibility with non-polar systems. As a result, MTCS modified fumed silica exhibits excellent rheological control, anti-settling properties, thickening efficiency, and moisture resistance, making it an essential additive in adhesives, sealants, coatings, silicone rubber, and composite materials. How Is MTCS Modified Fumed Silica Produced? The production process begins with hydrophilic fumed silica obtained through flame hydrolysis of silicon tetrachloride (SiCl₄). The silica is subsequently treated with MTCS under controlled conditions. During the reaction, surface hydroxyl groups react with MTCS molecules to form stable Si–O–Si bonds while introducing hydrophobic methyl groups onto the silica surface. This surface modification changes the interaction between silica particles and surrounding media, resulting in enhanced hydrophobicity and improved dispersion behavior in many organic systems. Key Characteristics of MTCS Modified Fumed Silica Compared with hydrophilic fumed silica, MTCS modified grades offer several significant advantages: Excellent hydrophobicity Low moisture absorption Superior thickening efficiency in non-polar systems Outstanding anti-settling performance Improved storage stability Enhanced flow control and rheology adjustment Good dispersibility in organic media These properties make MTCS modified grades particularly suitable for formulations exposed to humid environments. Typical Applications 1. Silicone Sealants and RTV Systems MTCS modified fumed silica is widely used in RTV silicone sealants and silicone adhesives. It provides effective reinforcement, sag resistance, and viscosity control while maintaining excellent storage stability. 2. Adhesives and Sealants In polyurethane, MS polymer, and hybrid adhesive systems, MTCS modified silica improves rheology, prevents filler sedimentation, and enhances long-term performance. 3. Paints and Coatings Hydrophobic fumed silica is commonly employed as a rheology modifier and anti-settling agent in industrial coatings, marine coatings, and protective coatings. 4. Composite Materials The excellent compatibility of MTCS modified silica with organic resins makes it valuable in composite applications where mechanical strength and processing stability are required. MTCS Modified vs Hydrophilic Fumed Silica Property MTCS Modified Fumed Silica Hydrophilic Fumed Silica Surface Chemistry Methyl-treated Silanol-rich Water Affinity Hydrophobic Hydrophilic Moisture Absorption Very Low High Organic Compatibility Excellent Moderate Anti-Settling Performance Excellent Good Use in Sealants Highly Recommended Limited Conclusion MTCS Modified Fumed Silica is one of the most widely used hydrophobic fumed silica products in the market today. By replacing surface hydroxyl groups with methyl groups, it delivers superior moisture resistance, rheological performance, and formulation stability. For applications such as silicone sealants, adhesives, coatings, and composites, MTCS modified fumed silica remains a highly effective solution for improving product performance and processing efficiency. As a trusted fumed silica manufacturer, GESEESIL offers high-quality MTCS modified fumed silica grades designed to meet the demanding requirements of sealants, adhesives, coatings, and advanced material applications. Our products provide excellent hydrophobicity, rheological control, and long-term formulation stability, helping customers achieve consistent and reliable performance.  

MTCS vs. STC Derived Fumed Silica: What’s the Difference? Fumed silica is a high-performance material widely used in coatings, adhesives, sealants, silicone rubber, inks, and composites. Depending on the production process and surface treatment, fumed silica can exhibit very different properties. Two common routes involve the use of Silicon Tetrachloride (STC) and Methyltrichlorosilane (MTCS) as raw materials. Understanding the difference between these two types of fumed silica can help manufacturers select the most suitable product for their applications. 1. STC-Based Fumed Silica STC (Silicon Tetrachloride, SiCl₄) is the traditional raw material used to produce fumed silica through flame hydrolysis. The resulting product is typically hydrophilic fumed silica, characterized by a large number of hydroxyl (Si-OH) groups on the surface. Key Features: High specific surface area Excellent thickening and reinforcing properties Strong hydrogen bonding capability Good dispersion in polar systems Suitable for coatings, inks, silicone rubber, and resins Typical examples include AEROSIL® 200 and similar grades. 2. MTCS-Based Fumed Silica MTCS (Methyltrichlorosilane, CH₃SiCl₃) introduces methyl groups during the production process. As a result, the silica surface becomes inherently hydrophobic. This type of fumed silica is often referred to as hydrophobic fumed silica. Key Features: Excellent water repellency Low moisture absorption Improved dispersion in non-polar systems Enhanced anti-settling performance Better stability under humid conditions MTCS-derived fumed silica is widely used in sealants, adhesives, RTV silicone, thermal insulation materials, and waterproof coatings. 3. Comparison Between STC and MTCS Fumed Silica Property STC-Based Fumed Silica MTCS-Based Fumed Silica Surface Character Hydrophilic Hydrophobic Surface Groups Si-OH Si-CH₃ Moisture Absorption High Very Low Water Resistance Limited Excellent Polar System Compatibility Excellent Moderate Non-Polar System Compatibility Moderate Excellent Typical Applications Paints, Inks, Rubber Sealants, Adhesives, Waterproof Systems 4. Which One Should You Choose? If your formulation requires strong thickening effects in polar systems, STC-based hydrophilic fumed silica is usually the preferred option. However, if water resistance, moisture protection, and compatibility with non-polar systems are critical, MTCS-derived hydrophobic fumed silica can provide superior performance. In many advanced adhesive and sealant applications, MTCS-modified fumed silica has become the preferred choice due to its excellent rheology control and long-term stability. About GESEE New Material Zhengzhou Gesee New Material Co., Ltd. specializes in the development and supply of high-quality fumed silica products for global customers. Our portfolio includes both hydrophilic and hydrophobic fumed silica grades, offering reliable alternatives to leading international brands for applications in adhesives, sealants, coatings, silicone rubber, and composite materials. If you are looking for cost-effective fumed silica solutions, feel free to contact GESEE for technical support and product recommendations.