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Silico® Carboxyl Modified Silicone Fluids

Carboxy-functional silicone oils are modified polydimethylsiloxane (PDMS) fluids that incorporate carboxyl (-COOH) groups to enhance chemical reactivity and surface interaction. Common structural types include:

Terminal Carboxylic Group (End-Capped): Carboxyl groups are attached to the polymer chain ends, as seen in CYS-101 and CYS-B12.
Side-Chain Modified: Carboxyl groups are grafted onto the PDMS side chains, such as in CYS-3701E.
Multi-Functional End Groups: Incorporation of both hydroxyl (–OH) and carboxyl (–COOH) groups for increased reactivity and substrate adhesion, such as in Hydroxy-Carboxy-Terminated PDMS.

Key Functional Advantages:

Enhanced Hydrophilicity and Adhesion: Carboxyl groups improve compatibility with polar substrates including metals, glass, and leather.
High Reactivity: Carboxyl functionalities can react with amines, epoxies, isocyanates, etc., making them suitable for crosslinking and grafting applications.
Thermal Stability & Flexibility: Retains low surface energy and thermal resistance typical of PDMS, while improving mechanical and interfacial properties.

Industrial Applications of Carboxy-Functional Silicone Fluids

Thanks to their versatile structure and superior performance, carboxy-functional silicone fluids are widely used in high-performance industrial formulations, including:

Leather Finishing Agents:
CYS-101 enhances water repellency and hand feel in leather chrome tanning applications.
Coatings & Adhesives:
CYS-3701E improves adhesion strength, flexibility, and weather resistance in paints, inks, and pressure-sensitive adhesives.
Biomedical & Pharmaceutical Materials:
CYS-B12 is used in biocompatible devices and controlled-release drug delivery platforms.
Personal Care Products:
Hydroxy-Carboxy-Terminated PDMS improves spreadability, sensory feel, and formulation stability in creams, lotions, and conditioners.

Recommended Vinyl Silicone Oils

CYS-101 Carboxy-Terminated Silicone Fluid

CYS-101 (CAS 851486-70-9) is a carboxy-terminated PDMS from Silico® with good compatibility, water resistance, and crosslinking ability. It’s used in leather, textiles, coatings, polymers, and surface treatments.

CYS-B12 Carboxy-Terminated Silicone Fluid

CYS-B12 (CAS 58130-04-4) is a low-viscosity PDMS fluid with reactive carboxyl end groups. It enhances bonding, adhesion, and surface performance in adhesives, sealants, biomaterials, and coatings.

CYS-B12 Carboxy-Terminated Silicone Fluid

CYS-B13 Hydroxy-Carboxy-Terminated PDMS (CAS 58130-04-4) is a silicone fluid with –OH and –COOH end groups. It has high reactivity, good thermal stability, and broad compatibility for industrial use.

CYS-3701E Carboxy-Modified Silicone Fluid

CYS-3701E is a high-performance PDMS fluid with carboxyl groups (-COOH). It offers good reactivity, adhesion, and resin compatibility for use in coatings, lubricants, mold release, and resin modification.

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How to Choose Carboxyl Modified Silicone Fluids？

Selecting the right carboxyl modified silicone fluid depends on your application’s specific performance requirements. Key factors include viscosity, carboxyl content, and compatibility with resins or solvents. For coatings and adhesives, lower-viscosity fluids with reactive –COOH groups enhance adhesion and crosslinking. For lubricants or mold release, higher-viscosity grades offer better film strength and thermal stability. Always check parameters such as refractive index, density, and solubility to ensure compatibility with your formulation. Brands like Silico® CYS-3701E offer a wide range of reliable options tailored for industrial and personal care applications.