1、硅烷偶联剂 Silane Coupling Agent (2)
硅烷偶联剂是一类具有特殊结构的低分子有机硅化合物，其通式为RSiX3，式中R代表与聚合物分子有亲和力或反应能力的活性官能团，如氧基、巯基、乙烯基、环氧基、酰胺基、氨丙基等;X代表能够水解的烷氧基，如卤素、烷氧基、酰氧基等。 在进行偶联时，首先X基水形成硅醇，然后与无机粉体颗粒表面上的羟基反应，形成氢键并缩合成—SiO—M共价键 (M表示无机粉体颗粒表面)。 同时，硅烷各分子的硅醇又相互缔合齐聚形成网状结构的膜覆盖在粉体颗粒表面，使无机粉体表面有机化。 其化学反应的简要过程如下： 水解： 缩合： 氢键形成： 共价键形成： 硅烷偶联剂在高聚物基复合材料中的作用机理主要有以下几种理论：
2、Silane Coupling Agents
Many conventional coupling agents are frequently used in combination with 10-40% of a non-functional dipodal silane, where the conventional coupling agent provides the appropriate functionality for the application, and the non-functional dipodal silane provides increased durability.
3、Silane Coupling Agents Application Guide
Aminosilanes are recommended for this purpose. Usually, the silane coupling agent is admixed with the binder resin or with the curing catalyst of the resin. When blending with the resin is desired, SiSiB® PC1220, a di-functional aminosilane, is the recommended silane coupling agent for storage.
4、Upload_32_F2030C_Silane Coupling Agents
硅烷偶联剂是一类同时含有两种不同化学性质官能团的有机硅化合物。 一种官能团可以与有机材料反应,另外一种可以与无机材料反应。 其结构通式如下: 其中,Y代表可以与有机材料结合的官能团,比如乙烯基、环氧基、氨基等。 X代表可以在水中或潮湿环境中水解的官能团,这些官能团水解成硅醇从而与无机材料结合。 典型的X基团包括氯、烷氧基,以及乙酰氧基等。 硅烷偶联剂能够提高有机和无机材料界面的粘接性,被广泛用于增强玻璃纤维强化塑料的强度及性能。 近来,硅烷偶联剂被应用在无机-有机杂化材料的生产上,比如印刷电路板用的层压板、人造大理石、塑料磁体和二氧化硅固定化生物活性物质。 除了用于提高界面粘接性,硅烷偶联剂的各种用途也正在开发中。
Silane Coupling Agent
Silane coupling agents improve the mechanical properties of silica and silicate containing fillers. A chemical bond is formed between the filler and the rubber matrix. The generally used silane coupling agents are bis- (3-triethoxysilylpropyl)tetrasulfane and 3-thio-cyanatopropyl triethoxysilane.
Recent Progress in Silane Coupling Agent with Its Emerging Applications
Among the modification methods, silane coupling agent is a simple way to introduce functional groups onto the surfaces of particles [2]. Silane coupling agent contain both organic functional and alkoxy groups in one molecule. The silanol group forms from the alkoxy group via hydrolysis.
Silane Coupling Agent_化工百科
Silane Coupling Agent - 简介 正硅酸乙酯，又称为乙基正硅酸酯。 它是一种有机硅化合物，由乙醇和正硅酸通过缩合反应得到。 它可溶于有机溶剂，如醇类、醚类、烃类等。 正硅酸乙酯在化学工业中广泛应用，主要用作有机硅的预聚体和交联剂。
Silane Coupling Agents: The Molecular Bridges Transforming Material
Discover silane coupling agents from Alfa Chemistry: molecular bridges enhancing composite performance. Learn mechanisms, types (amino/vinyl/epoxy), dental applications, selection guidelines & protocols.
19022_Silane_Coupling_Agents_
The use of a silane coupling agent as a primer is a widely practiced technique for the improvement of the adhesive bonding between a sealing material such as a polyurethane-or polysulfide-based sealant and the surface of an inorganic substrate such as metal or glass, since otherwise the adhesive bonding strength between them is rather poor.
How Silane Coupling Agents Become Secret Weapons in
In particular, KH-570 and KH-560 are two types of silane coupling agents that, when mixed in a 3:2 ratio, can significantly enhance adhesion to substrates. KH-570 has methacryloxy groups, while KH-560 contains glycidoxy groups.
In the vast realm of modern material science, organic-inorganic hybrid materials play a pivotal role due to their unique physical, chemical, and mechanical properties. Among these, methylsilane coupling agents have emerged as a crucial tool for fabricating hybrid materials, boasting widespread applications and remarkable effects. This article delves into the mysteries of methylsilane coupling agents, elucidating their value and impact in the preparation of organic-inorganic hybrid materials.
I. Definition and Classification of Methylsilane Coupling Agents
Methylsilane coupling agents are silicon-containing organic compounds that react with active groups such as hydroxyl or carboxyl groups on inorganic surfaces via Si-H bonds, enabling the synthesis of organic-inorganic hybrid materials. Based on their reaction mechanisms, they can be classified into two categories: silane coupling agents, primarily used for modifying metal oxide surfaces, and silane crosslinking agents, which facilitate crosslinking between polymers.
II. Mechanism of Action
The efficacy of methylsilane coupling agents hinges on the formation of Si-H bonds. When reacting with inorganic surfaces, these agents form stable chemical bonds between organic molecules and inorganic materials through Si-H bonding. This mechanism not only enhances the performance of hybrid materials but also simplifies manufacturing processes and reduces costs.
III. Applications in Organic-Inorganic Hybrid Materials
- Surface Modification of Metal Oxides
Methylsilane coupling agents are widely employed to modify metal oxide surfaces. For instance, in ceramic coatings, glass films, and paints, they improve wear resistance, chemical corrosion resistance, and thermal stability. Additionally, they enable functionalization of surfaces, such as antibacterial or self-cleaning properties.
- Crosslinking Between Polymers
In polymer science, methylsilane coupling agents are indispensable for crosslinking polymers, yielding high-strength, high-modulus, and high-toughness composites. They also enhance surface properties, including aging resistance, flame retardancy, and antistatic performance.
IV. Advantages and Challenges
Methylsilane coupling agents offer significant advantages: mild reaction conditions, versatility in functionalization, and improved mechanical, thermal, corrosion, and biocompatibility properties. challenges persist, such as poor reaction selectivity and extended reaction times. Researchers are actively exploring new synthesis methods to address these limitations and expand their applicability.
methylsilane coupling agents are a powerful tool for fabricating organic-inorganic hybrid materials, particularly in surface modification and polymer crosslinking. With advancing technology and growing demand, their research and application will likely gain further traction. Let us await the next chapter in material science, where methylsilane coupling agents shine even brighter.
