A High-Performance Polysiloxane Integrating Waterproofing, Anti-Fouling, Toughening, and Release Functions Changfu® CA24.

      Traditional interface modifiers often suffer from limited functionality, struggling to balance long-term adhesion with comprehensive protection. To address this, Changfu Chemical introduces Changfu^® CA24 (Carboxylbis(trimethylsiloxy)methylsilane). Through precise molecular design, it integrates high reactivity, flexible toughening, and long-lasting protective properties. It not only forms strong chemical bonds with various resin systems but also, with its excellent hydrophobicity, oleophobicity, and interface modulation capabilities, serves as a key enabler for pushing the performance boundaries of composite materials and advancing process innovation. It is the ideal choice for upgrading interface engineering into high-performance materials. 

1. Product Features:

• High Reactivity & Chemical Bonding

      Equipped with highly reactive functional groups, Changfu^® CA24 rapidly undergoes chemical reactions with organic functional groups in epoxy, polyurethane, acrylic, and other resin systems, forming stable covalent bonds at the interface. This molecular-level bonding creates a strong chemical bridge between organic matrices and inorganic substrates or fillers, significantly enhancing interfacial adhesion, preventing delamination, and ensuring long-term structural integrity under harsh conditions such as high humidity, temperature cycling, and chemical exposure. The high reactivity also enables faster curing and better crosslinking efficiency, improving both production throughput and final material performance.

• Flexible Toughening & Stress Buffering

      The flexible long-chain molecular structure of Changfu^® CA24 effectively mitigates internal stress caused by mismatched thermal expansion coefficients between inorganic fillers and organic matrices. By introducing molecular flexibility and mobility at the interface, it improves impact resistance, fracture toughness, and dimensional stability of composites while maintaining excellent compatibility with a wide range of resin systems, fillers, and substrates. This stress-buffering effect reduces microcracking and fatigue failure, especially under dynamic loading or extreme temperature variations, making it ideal for durable structural composites, high-performance coatings, and resilient sealants.

• Waterproofing, Anti-Fouling & Interface Protection

      Incorporated siloxane groups in Changfu^® CA24 deliver strong hydrophobicity and low surface energy, forming a durable protective barrier that repels water, oil, and contaminants. This barrier significantly enhances substrate resistance to moisture penetration, corrosion, and weathering, effectively reducing degradation from hydrolysis, oxidation, and environmental exposure. By minimizing water uptake and surface contamination, it preserves appearance, mechanical properties, and electrical insulation over extended service life in high-humidity, corrosive, or outdoor environments. The long-term protective effect also lowers maintenance costs and extends the service intervals of coated or composite components.

2. Applications:

• Polymer Material Modifier

      Changfu^® CA24 readily reacts with active functional groups in polyurethane, polyester, epoxy, and acrylic resin systems, forming stable covalent bonds at the molecular interface. This chemical integration significantly enhances the weatherability, flexibility, and hydrolysis resistance of the final polymer. It effectively improves elongation at break, impact resistance, and low-temperature toughness while preserving high hardness and adhesion. It is especially suitable for high-performance specialty coatings, weather-resistant sealants, durable elastomers, and composite matrices that require an optimal balance of flexibility and mechanical strength.

• Powder Dispersant & Filler Compatibilizer

      Changfu^® CA24 greatly improves the dispersion stability of inorganic fillers (such as silica, talc, calcium carbonate, and metal oxides) in organic matrices. By forming a hydrophobic organic layer on the filler surface, it reduces particle agglomeration, lowers system viscosity, and improves processing flowability. This results in composites with higher filler loading, more uniform mechanical properties, and enhanced resistance to moisture and corrosion.

• Substrate Surface Priming

      Used as a surface pretreatment or primer additive, Changfu^® CA24 enhances the adhesion of coatings and adhesives to difficult substrates like glass, metal, plastics, and treated wood. It creates a reactive intermediate layer that bridges the organic coating and inorganic substrate, effectively preventing peeling, blistering, or loss of adhesion under high humidity or cyclic temperature conditions.

• Advanced Composite & Sealant Additive

      In fiber-reinforced composites and high-performance sealants, Changfu^® CA24 acts as a critical interface modifier. It improves the wetting and bonding between resin and fiber/filler, reduces internal stress, and enhances overall composite integrity. The resulting materials exhibit improved flexural strength, fatigue resistance, and long-term durability in structural, automotive, and marine applications.

• Weatherable & Protective Coatings

      For exterior coatings, industrial protective coatings, and anti-fouling systems, the hydrophobic and low-surface-energy properties of Changfu^® CA24 provide excellent water repellency, stain resistance, and UV stability. It helps maintain gloss, reduces dirt pickup, and extends the service life of coatings in harsh outdoor, industrial, or marine environments.

      Changfu Chemical's Changfu^® CA24, with its high reactivity and flexible molecular design, forms stable covalent bonds at the organic-inorganic interface. It significantly enhances adhesion, impact resistance, and weather resistance, and is compatible with multiple resin systems and harsh working conditions. As a core additive for interface modification, it helps upgrade material performance, provides long-term and reliable solutions for fields such as coatings and composite materials, and empowers the research, development, and application of high-quality materials.

      Note: Specific application results should be evaluated based on actual usage conditions. Please contact our technical team for more product information and professional support.

Contact:

Phone: (+86) 181-6277-0058

Email: sales@cfsilanes.com

Key words: Carboxylbis(trimethylsiloxy)methylsilane; Polysiloxane; Flexible Toughening; Waterproofing.