N-Butylaminopropyltrimethoxysilane | Manta A431

Manta A431 is N-(3-(trimethoxysilyl)propyl)butylamine (CAS 31024-56-3, ≥97% purity by GC), a secondary aminosilane used as an adhesion promoter, NCO-prepolymer modifier and end-capper in adhesives, MS Polymer and SPUR systems, foundry resins and fiberglass sizing. Its secondary amine reduces yellowing versus primary aminosilanes; it is comparable to Silquest A-1189 and Dynasylan 1189.

Manta A431 is a high-performance mono-amino silane featuring a reactive secondary amine functional group and three hydrolyzable methoxy groups. This dual reactivity enables it to function as a highly efficient molecular bridge, forming robust bidirectional chemical bonds between inorganic substrates (e.g., glass, metals, minerals) and organic polymers.

Unlike primary amino silanes, the secondary amine structure in A431 provides enhanced flexibility, improved stability, and reduced yellowing in final formulations. It is specifically engineered to improve the mechanical properties of composites and enhance the bond strength and water resistance of resin coatings.

It is the chemical equivalent to industry standards such as Momentive Silquest A-1189 and Evonik Dynasylan 1189.

Manta A431 dual reactivity enables it to function as a highly efficient molecular bridge, forming robust bidirectional chemical bonds between inorganic substrates (e.g., glass, metals, minerals) and organic polymers.

Unlike primary amino silanes, the secondary amine structure in A431 provides enhanced flexibility, improved stability, and reduced yellowing in final formulations. It is specifically engineered to improve the mechanical properties of composites and enhance the bond strength and water resistance of resin coatings.

It is the chemical equivalent to industry standards such as Momentive Silquest A-1189 and Evonik Dynasylan 1189.

Manta A431 is widely utilized across adhesives, sealants, coatings, and composites:

1. Adhesives & Sealants: Used as a premier adhesion promoter and for the chemical modification of NCO-functional prepolymers in advanced adhesive systems.
2. Silane-Modified Polymers (SMP): Functions as a highly flexible adhesion promoter and end-capper in MS Polymer and SPUR systems.
3. Resin Modification: Serves as a vital additive in phenolic, furan, and melamine-based resins, specifically in high-performance foundry formulations.
4. Mineral Fillers: Provides excellent surface treatment for fillers and pigments incorporated into mineral-reinforced polymers, improving dispersion and mechanical strength.
5. Paints & Coatings: Acts as a primer and formulation additive to dramatically enhance wet and dry adhesion to challenging substrates.
6. Fiberglass Composites: Utilized as a sizing agent and finishing component in glass fiber and glass fabric composites.

Formulation & Handling Guidelines

• Autocatalytic Hydrolysis: In the presence of ambient moisture, the methoxy groups hydrolyze to form reactive silanols, releasing methanol. Unlike many silanes, A431 is autocatalytic and does not require an acid catalyst. The typical pH of its hydrolysate is 10–11; however, adjusting to ~pH 4 can significantly improve bath stability.
• Solvent Incompatibility (CRITICAL): The secondary amine group reacts with ketones and esters. Strictly avoid using ketone or ester-based solvents for dilution or formulation.
• Atmospheric Sensitivity: The active amine groups can react with atmospheric carbon dioxide (CO2) to form carbamates or carbonates. Ensure containers are tightly sealed and purged with inert gas after dispensing.