ChangFu® LNA33 Carboxy-Functional Silane Coupling Agent：An Efficient Additive for Filler Dispersion, Interfacial Enhancement, and Metal Anti-Corrosion.

ChangFu^® LNA33 {Triethoxysilylpropylmaleamic acid; CAS: 33525-68-7} is a silane coupling agent that integrates strong anchoring capability with highly reactive carboxyl functional groups. The silane end forms covalent bonds with inorganic surfaces through controllable hydrolysis, while the carboxyl end can react with organic functional groups such as epoxy and amino groups, thereby building a robust organic-inorganic interface. This product is increasingly becoming an indispensable key additive in demanding fields requiring superior adhesion, hydrolysis resistance, and corrosion protection—such as metal treatment, biological immobilization, and high-performance composites—significantly enhancing the mechanical properties and weather resistance of end products.

Core Advantages:

• Outstanding Interfacial Modification

     Significantly improves compatibility between resins and fillers, reduces interfacial defects, and greatly enhances the tensile strength, impact toughness, and hydrolysis resistance of composite materials, extending service life.

• Excellent Compatibility and Dispersion

     The carboxyl functional group provides good polarity and reactivity, promoting uniform dispersion of fillers (e.g., silica, calcium carbonate) in polymer matrices, preventing agglomeration, and improving processing stability and final product consistency.

• Metal Anti-Corrosion and Adhesion Enhancement

     In metal protective coatings and bonding applications, it not only strengthens adhesion through chemical bonding but also forms a dense passivation film on metal surfaces due to its weak acidity, significantly inhibiting chemical corrosion. Ideal for harsh corrosive environments.

Key Application Scenarios:

1. Reinforcement of High-Performance Composites

• Polymerizes with unsaturated resins such as styrene and acrylic, delivering excellent adhesion promotion.
• Used for surface treatment of mineral fillers and fibers, markedly improving interfacial bonding strength with polymer matrices and enhancing mechanical properties and processing flowability.
• In silica-reinforced rubber systems, effectively couples fillers with the rubber matrix, reduces compound viscosity, and improves wet skid resistance while lowering rolling resistance.

2. High-Reliability Coatings and Structural Bonding

• Serves as a key adhesion promoter in anti-corrosion coatings for metal substrates in highly corrosive environments, providing long-term weather-resistant protection.
• Added to structural adhesives such as epoxy and polyurethane, significantly enhancing peel strength and durability to meet high-load bonding requirements.

3. Specialty Functional Material Design

• Suitable for reactive oxygen species (ROS) generation systems, aiding in the development of bio- and packaging materials with synergistic antibacterial functions.
• Can be used to construct self-assembled monolayers on metal or oxide surfaces, enabling surface wettability control, corrosion protection, and functionalization of sensor substrates.

Note: For more product information, please contact our technical team to obtain detailed product materials and professional technical support.

Contact Information:

Phone: (+86) 181-6277-0058

Email: sales@cfsilanes.com

Key words:Silane coupling agent;  Triethoxysilylpropylmaleamic acid; CAS: 33525-68-7; Carboxyl functional group; Anti-Corrosion; Adhesion promotion.