Description

Dimethyloctadecyl[3-(Trimethoxysilyl)Propyl]Ammonium Chloride is a quaternary ammonium silane, a bifunctional organosilicon compound that combines cationic and organosilane properties. This unique structure makes it an exceptionally effective coupling agent and antimicrobial modifier for a wide range of inorganic and organic materials. It is primarily used by manufacturers in the coatings, plastics, textiles, and construction industries to impart durable surface functionality, such as antimicrobial protection, hydrophobicity, and improved adhesion.

Application

• Antimicrobial Surface Modification: Covalently bonds to substrates like glass, metals, and polymers to create durable, non-leaching antimicrobial surfaces for medical devices, textiles, and building materials.
• Coupling Agent for Composites: Enhances the interfacial adhesion between inorganic fillers (e.g., silica, glass fibers) and organic polymer matrices (e.g., epoxy, polyolefins), improving mechanical properties in composite materials.
• Surface Treatment for Pigments & Fillers: Used to modify the surface of pigments and mineral fillers, improving their dispersion and compatibility in paints, coatings, and plastics.
• Textile Finishing Agent: Imparts durable water repellency (DWR) and antimicrobial properties to natural and synthetic fibers.
• Adhesion Promoter in Coatings: Improves the adhesion of paints, inks, and adhesives to difficult-to-bond substrates like metals and treated plastics.
• Paper & Pulp Industry: Acts as a retention aid, drainage aid, and antimicrobial agent in papermaking processes.

Basic Information

Product Name	Dimethyloctadecyl[3-(Trimethoxysilyl)Propyl]Ammonium Chloride
CAS No.	27668-52-6
Molecular Formula	C₂₆H₅₈ClNO₃Si
Molecular Weight	496.29 g/mol
Synonyms	Octadecyldimethyl(3-trimethoxysilylpropyl)ammonium chloride; 3-(Trimethoxysilyl)propyldimethyloctadecylammonium chloride; DMOAP; Silane quaternary ammonium compound QAS-18; DC 5700 (Dow Corning trade name variant); Antimicrobial organosilane quat; (3-Trimethoxysilylpropyl)octadecyldimethylammonium chloride; N,N-Dimethyl-N-octadecyl-3-(trimethoxysilyl)-1-propanaminium chloride
EINECS	248-595-8

Quality Control

Our production of Dimethyloctadecyl[3-(Trimethoxysilyl)Propyl]Ammonium Chloride adheres to strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure consistent purity, activity, and performance. Certificates of Analysis (COA) detailing key parameters such as assay, chloride content, and silane content are provided with every shipment. Our quality system is designed to support applications requiring reliable and traceable material performance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive). Keep the container tightly sealed under an inert atmosphere (e.g., nitrogen) to prevent hydrolysis and degradation upon contact with atmospheric moisture.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (Active Content)	≥ 40% in Methanol (or as specified)
Chloride Content	Conforms
Refractive Index (n20D)	1.410 - 1.430
Density (20°C)	0.89 - 0.92 g/mL

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.