Hexadecyltrimethoxysilane, with the CAS number 16415-12-6, is a high - quality chemical product offered at a low price. This silane coupling agent has a molecular formula of C₁₉H₄₂O₃Si and a molecular weight of approximately 346.62 g/mol. It appears as a clear to slightly yellowish liquid at room temperature. The boiling point of Hexadecyltrimethoxysilane is around 148 - 150°C at 1.33 kPa, and it has a density of about 0.87 - 0.89 g/cm³.
It has good solubility in common organic solvents such as toluene, xylene, and hexane, but is insoluble in water. The product is known for its high purity, which ensures consistent performance in various applications.
1. Surface Modification: Hexadecyltrimethoxysilane can be used to modify the surface properties of inorganic materials like glass, silica, and metal oxides. By forming a self - assembled monolayer on the surface, it can improve the hydrophobicity of the material, making it resistant to water, moisture, and some chemicals. This is useful in applications such as anti - fogging coatings for glass, waterproofing of building materials, and corrosion protection of metals.
2. Adhesion Promotion: In composite materials, this silane coupling agent can enhance the adhesion between the organic matrix (such as polymers) and the inorganic filler. It helps to transfer stress more effectively, improving the mechanical properties of the composite, such as strength and toughness. This is widely used in the production of fiberglass - reinforced plastics, rubber composites, and other composite materials.
3. In the Cosmetics Industry: It can be used as an ingredient in some cosmetics to improve the texture and stability of products. For example, it can be added to lipsticks to make them more resistant to smudging and increase their durability on the lips.
1. Surface Treatment: First, clean the surface of the substrate thoroughly to remove any dirt, grease, or other contaminants. Then, prepare a solution of Hexadecyltrimethoxysilane in an appropriate organic solvent. The concentration of the solution usually ranges from 1% to 5%, depending on the specific application. Dip the substrate into the solution for a certain period (usually 1 - 10 minutes), or use a spraying or brushing method to apply the solution evenly on the surface. After that, dry the substrate at room temperature or in an oven at a suitable temperature (usually 80 - 120°C) for a few hours to ensure the formation of a stable silane layer.
2. In Composite Production: When using Hexadecyltrimethoxysilane in composite materials, it can be added directly to the polymer matrix or used to pretreat the inorganic filler. If added directly to the matrix, it should be mixed well with the polymer under appropriate conditions (such as heating and stirring). If used for filler pretreatment, the filler is first dispersed in a solution of the silane coupling agent, and then the treated filler is added to the polymer matrix.
Case 1: In a glass manufacturing company, they used Hexadecyltrimethoxysilane to modify the surface of glass products. Before treatment, the glass was prone to fogging when exposed to moist air. After surface treatment with a 3% solution of Hexadecyltrimethoxysilane in toluene, the glass showed excellent anti - fogging properties. The treated glass could be used in bathroom mirrors, car windshields, and other applications where fogging is a problem.
Case 2: A composite material manufacturer was producing fiberglass - reinforced plastics. By adding Hexadecyltrimethoxysilane to the epoxy resin matrix, they found that the adhesion between the fiberglass and the resin was significantly improved. The tensile strength of the composite increased by about 20%, and the impact resistance also improved. This led to higher - quality composite products that could be used in aerospace, automotive, and other high - performance applications.
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