Tin-Free Alpha MS Polymer | Manta MS313

Manta MS313 is an alpha-silane terminated polyether (dimethoxy(methyl)silylmethylcarbamate end groups, viscosity 30000-42000 mPa·s at 25°C) used as a binder for moisture-curing industrial adhesives, construction sealants and electronic potting compounds. The alpha-effect of its terminal groups gives fast tack-free times and allows tin-free, plasticizer-free formulations without organotin catalysts.

Manta MS313 is a silane-terminated polyether (STPE) polymer designed for the formulation of high-performance moisture-curing adhesives and sealants. Unlike conventional silylated polymers, Manta MS313 features a unique alpha-silane structure (dimethoxy(methyl)silylmethylcarbamate group). This specific molecular architecture places the electron-donating nitrogen atom in close proximity to the silicon atom, significantly accelerating hydrolysis (known as the alpha-effect).

This intrinsic high reactivity allows for rapid curing profiles without the need for toxic organotin catalysts, offering a safer and more environmentally friendly alternative to traditional polyurethane or silicone systems. It cures upon exposure to ambient moisture to form a tough, elastic, and durable siloxane network.

Properties

• Novel Alpha-Silane Technology:Exhibits extremely fast curing speeds and rapid tack-free times due to the alpha-effect.
• Eco-friendly & Tin-Free:Enables the formulation of tin-free and plasticizer-free adhesives, meeting stringent regulatory standards.
• Superior Processability: Low viscosity allows for easy compounding with high filler loadings without compromising flow properties.
• Balanced Mechanics:Delivers exceptional tensile strength and high elasticity, adjustable to a wide range of modulus requirements.
• Excellent Stability: Provides long shelf-life stability in properly sealed formulations.
• Broad Adhesion:Bonds well to a variety of substrates without primers.

Unlike conventional silylated polymers, Manta MS313 features a unique silane structure. This specific molecular architecture places the electron-donating nitrogen atom in close proximity to the silicon atom, significantly accelerating hydrolysis.

This intrinsic high reactivity allows for rapid curing profiles without the need for toxic organotin catalysts, offering a safer and more environmentally friendly alternative to traditional polyurethane or silicone systems. It cures upon exposure to ambient moisture to form a tough, elastic, and durable siloxane network.

MS313 serves as a high-performance reactive binder for moisture-curing sealants, adhesives, potting compounds, and additives in coatings. It is specifically engineered for systems requiring rapid curing, high elastic recovery, and tin-free formulations.

Key Application Fields:

1. Industrial Adhesives: Ideal for elastic bonding in structural engineering, automotive assembly, and transportation, where vibration resistance and durability are critical.
2. Construction Sealants: Perfect for formulating high-quality, overpaintable, and weather-resistant construction sealants (complies with low-VOC requirements).
3. Electronics & Electrical: Used as a potting or encapsulation compound to protect sensitive components, providing excellent insulation and stress relief.
4. DIY & Assembly: Excellent for “liquid nail” type assembly adhesives, offering high initial tack and fast strength build-up.

Processing

1. Moisture Sensitivity: Manta MS313 is highly reactive to moisture. It is essential to maintain a moisture-free environment during both storage and production to prevent premature gelation.
2. Filler Compatibility: The polymer exhibits excellent compatibility with various fillers, such as PCC, GCC, fumed silica, and aluminum hydroxide, allowing for versatile formulation designs.
3. Dehydration: Fillers must be dried before use. We recommend using Vinyltrimethoxysilane (VTMO) as a water scavenger during the mixing process to ensure shelf-life stability.
4. Plasticizer Selection: Compatible with a variety of plasticizers including DINP, DIDP, and Polypropylene Glycol (PPG).
5. Additives: Performance can be further enhanced by incorporating adhesion promoters, antioxidants, UV stabilizers, and fungicides.