Siwin-M3303H
Siwin
3910000000
Siwin-M3303H
216597-12-8
Approx 36000 mPa.s
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M3303H (Siwin-M3303H) is a silane-modified polyether resin, also known as MS polymer or silyl-terminated polyether. Manufactured by Siwin, this product features a polyoxypropylene main chain terminated with alkoxysilane groups. With CAS number 216597-12-8, it serves as the base resin for formulating moisture-curing elastic sealants, structural adhesives, and sealing coatings.
The polymer cures through hydrolysis and cross-linking of alkoxy groups under humid conditions at room temperature. Compared to traditional silicone and polyurethane sealants, M3303H-based formulations contain no solvent, emit low VOC levels, and contain no free isocyanate. The product targets commercial procurement in construction, industrial assembly, transportation, and new energy sectors.
Parameter | Value |
|---|---|
Product No. | Siwin-M3303H |
Chemical Name | Silane modified polyether / MS Polymer |
Appearance | Colorless, transparent |
Flash Point | >100°C |
Viscosity (25°C) | Approx 36,000 mPa.s |
Density (25°C) | 1.002 - 1.005 g/cm³ |
Reactivity Level | High activity |
Modulus Type | Medium modulus |
M3303H exhibits several measurable performance attributes that differentiate it from alternative resin systems. The polymer reaches tack-free surface condition within 30 to 60 minutes under standard conditions of 23°C and 50% relative humidity. Full cure typically completes within 7 days at 2mm thickness.
Formulations based on M3303H demonstrate yellowing resistance with ΔE values below 2 after 1000 hours of accelerated UV exposure testing. The cured polymer maintains elastic properties across a temperature range from -40°C to 90°C, with elongation at break exceeding 300% in standard formulations. Tensile strength reaches 2.0 to 2.5 MPa after complete cure, depending on formulation design and filler loading.
The resin system contains no solvent and produces minimal odor during application. Cured films show resistance to water immersion and tolerate exposure to a range of chemical solvents, including dilute acids and bases. Storage stability extends to 12 months in unopened packaging under recommended conditions.
M3303H can be compounded with various fillers to adjust mechanical properties and reduce formulation cost. Compatible fillers include nano calcium carbonate, heavy calcium carbonate, fumed silica, silica powder, diatomaceous earth, and aluminum hydroxide. Fillers must be thoroughly dehydrated before incorporation to prevent premature curing during production.
Curing is initiated by moisture in the presence of a catalyst. Common catalyst systems include organotin compounds such as dibutyltin dilaurate, as well as amine-based catalysts. Catalyst loading typically ranges from 0.1% to 1.0% by weight, adjusted according to desired cure speed and application temperature.
The polymer system accepts a range of functional additives including tackifiers for improved substrate adhesion, antioxidants for thermal stability, mildew inhibitors for sanitary applications, and UV light stabilizers for outdoor exposure. Plasticizers such as phthalates (DOP, DINP, DIDP) and low molecular weight polyethers can be incorporated to adjust viscosity and modulus.
M3303H supports both one-component and two-component formulation designs. One-component systems cure through atmospheric moisture absorption and offer convenience in field applications. Two-component systems provide faster cure speed and deeper section curing, suitable for factory assembly lines.
Application |
M3303H is the main resin raw material for producing adhesives, sealants, potting compounds and coatings. It solidifies by absorbing moisture in the air under the action of catalysts (such as amines, tin, etc.) at room temperature. According to needs, we can design it into a one-component or two-component system formula product, which can widely bond different substrates. |
Process characteristics |
1. Since alkoxy groups hydrolyze and crosslink in a humid environment, it is very important to isolate moisture during storage and production. 2. The amount of M3303H added can be flexibly changed in the formulation design, and it can be mixed with most fillers, such as nano calcium carbonate, heavy calcium carbonate, white carbon black, silica powder, diatomaceous earth, aluminum hydroxide, etc. 3. In order to avoid premature curing of the product, the filler needs to be dehydrated, and Siwin-V31 is generally used as a dehydrator. 4. Commonly used plasticizers include phthalates (PPG, DOP, DINP, DIDP, etc.), low molecular weight polyethers, etc. 5. In order to obtain better performance, it can be mixed with other additives, such as tackifiers, antioxidants, mildew inhibitors, light stabilizers, etc. |
In building construction, M3303H serves as the base resin for expansion joint sealants, facade panel adhesives, and window installation sealants. The cured sealant accommodates structural movement while maintaining weather resistance and adhesion to common building substrates including glass, aluminum, concrete, and stone.
The transportation industry utilizes MS polymer adhesives for interior trim bonding, body panel assembly, and seam sealing applications. The adhesive provides vibration damping properties and maintains bond integrity across temperature cycling conditions.
For battery manufacturing in electric vehicles and energy storage systems, M3303H-based potting compounds provide thermal conductivity, electrical insulation, and moisture protection. The isocyanate-free formulation addresses worker safety concerns in battery assembly facilities.
General industrial assembly operations use MS polymer adhesives for bonding dissimilar substrates including metal, plastic, glass, and composite materials. The adhesive replaces mechanical fasteners in many applications, distributing stress across the bond line.
Siwin maintains ISO 9001 certification for its MS polymer production facility. Each batch undergoes viscosity testing, density measurement, and appearance inspection before release. Third-party testing confirms low VOC emissions and the absence of free isocyanate. The product complies with REACH and RoHS regulations for European market access.
M3303H is available in IBC plastic drums containing 1,000 kg and steel drums with aluminum foil liners containing 200 kg. Custom packaging options are available upon request for commercial procurement orders. The product should be stored in a cool, dry location away from direct sunlight and moisture. Shelf life is 12 months from the date of manufacture when stored in unopened original packaging under recommended conditions.
MS polymer cures through moisture-induced hydrolysis of terminal alkoxysilane groups, followed by condensation to form siloxane cross-links. The reaction proceeds at room temperature and requires atmospheric moisture to advance through the material thickness.
M3303H contains no free isocyanate, eliminating health hazards associated with isocyanate exposure. It also produces lower VOC emissions and shows better resistance to UV yellowing compared to standard polyurethane adhesives.
The product should be stored between 5°C and 30°C in sealed containers. Storage below 5°C may increase viscosity temporarily, while temperatures above 30°C can accelerate moisture-induced viscosity increase during extended storage.
Yes, M3303H is compatible with other silyl-terminated polyether grades and can be blended to adjust viscosity and modulus. It can also be combined with certain acrylic and polyurethane dispersions, though compatibility testing is recommended for each specific formulation.
