sílica fumada hidrofóbica

Atualmente, os inabalistas são um aditivo amplamente utilizado, desempenhando um papel significativo em vários campos, como alimentos, petroquímicos, fabricação de papel e limpeza industrial. Entre eles, os inabalistas de silicone são os produtos de Defoamer mais amplamente utilizados e consumidos. Outros tipos de defeituosos, como óleo mineral e poliéter, complementam as aplicações de defensores à base de silicone. Os principais componentes dos defensores de silicone incluem pasta de silicone, emulsificantes e espessantes, com a pasta de silicone sendo o ingrediente ativo em infilantes de silicone. A pasta de silicone é composta principalmente de óleo de silicone (ou óleo mineral, óleo vegetal, etc.) e sílica. Como um componente essencial dos infilantes, a sílica desempenha um papel crucial.Tomando um depoímero com óleo de silicone dimetil como a base de pasta de silicone como exemplo, devido à baixa dispersibilidade e baixa solubilidade do óleo de dimetil silicone nos sistemas de emulsão, é necessário usar sílica (preto de carbono branco) ou vários emulsificantes para melhorar sua dispersão. Os grupos de silanol em preto de carbono branco podem formar ligações de hidrogênio com água, aumentando a viscosidade do sistema, alcançando um efeito espessante e promovendo a dispersão e estabilidade do defeito. Devido ao tamanho de partícula pequena, grande área de superfície específica e alta energia superficial do preto de carbono branco, pode gerar uma força significativa para adsorver bolhas. Juntamente com o óleo de silicone, ele forma uma força que ataca bolhas, criando pontos fracos. Sob a baixa tensão superficial do óleo de silicone, as bolhas se rupram, levando ao fracasso. Este é o princípio geral de como os infratores funcionam. Em resumo, o preto de carbono branco serve principalmente para engrossar, dispersar e adsorver bolhas em infilantes. O preto de carbono branco hidrofílico tem baixa compatibilidade com óleo de silicone, enquanto o preto de carbono branco hidrofóbico, após a modificação da superfície, pode ser bem molhado e disperso em sistemas de óleo de silicone devido à sua hidrofobicidade.O método de preparação dos infilantes envolve principalmente duas etapas. O primeiro passo é a preparação da pasta de silicone, que envolve a dispersão e a reação do preto de carbono branco em óleo de silicone. O segundo passo envolve a adição de emulsificantes, espessantes e outros aditivos para emulsificar e dispersar a pasta de silicone em uma emulsão, que pode então ser diluída conforme necessário para preparar infilantes de diferentes concentrações. O preto de carbono branco pode ser dividido em dois tipos com base em processos de produção: preto de carbono branco precipitado e preto de carbono branco fumado. A vantagem do preto de carbono branco precipitado está em seu baixo custo, mas devido ao seu maior tamanho de partícula, é propenso a sedimentação, o que pode levar ao entupimento dos filtros em muitas aplicações de departamento. Por outro lado, o preto de carbono branco fumado possui um tamanho de partícula menor, melhores propriedades de suspensão, boa compatibilidade com emulsificantes, requer menor quantidade aditiva e possui excelentes propriedades de espessamento e anti-sedimentação. Além disso, o preto de carbono branco fumado que passou por modificação hidrofóbica possui inerentemente certas propriedades de infiltração, tornando -a uma solução ideal para os problemas enfrentados por preto de carbono branco precipitado em aplicações de doímeros. À medida que o preço do preto de carbono branco fumado diminui, sua relação custo-benefício nos infilantes se tornará ainda mais proeminente, tornando-a uma excelente opção para os infilantes.Nesse contexto, Gesesil 200, um produto de sílica hidrofílica de GESEE NOVOS MATERIAIS, se destaca como uma opção de alta qualidade para as formulações de doador. Para mais informações, visite www.geseesetch.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.