Siwin-M31
Siwin
Siwin-M31
2530-85-0
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γ-Methacryloxypropyltrimethoxysilane (Siwin-M31) is a methacrylate-functional silane coupling agent with the chemical formula C₁₀H₂₀O₅Si. Registered under CAS No. 2530-85-0 and EINECS No. 219-785-8, this organosilicon compound carries a dual-functional structure: a trimethoxysilyl group that bonds with inorganic substrates on one end, and a methacrylate group that copolymerizes with organic polymers on the other. This bifunctional design enables the material to act as a molecular bridge at the interface between inorganic and organic phases.
At room temperature, Siwin-M31 appears as a colorless transparent liquid with a density of 1.0450±0.0050 g/cm³ at 20°C. The product is offered in two purity grades — 98% minimum and 99% minimum — both quantified by gas chromatography. Its refractive index measures 1.4290±0.0050 at 25°C.
Parameter | Value |
|---|---|
Product No. | Siwin-M31 |
Chemical Name | 3-Methacryloxypropyltrimethoxysilane |
CAS NO. | 2530-85-0 |
EINECS NO. | 219-785-8 |
Formula | C₁₀H₂₀O₅Si |
Appearance | Colorless Transparent Liquid |
Density (ρ20°C, g/cm³) | 1.0450±0.0050 |
Refractive Index (n 25°C) | 1.4290±0.0050 |
Purity (by GC, %) | 98 min; 99 min |
Momentive | Dowcorning | ShinEtsu | Evonik | Wacker |
|---|---|---|---|---|
A-174 | Z-6030 | KBM-503 | MEMO | GF31 |
Siwin-M31 serves as a glass fiber sizing component in reinforced polyester composite systems. Applied to glass fiber surfaces, it forms a chemical bond between the silane group and the glass, while the methacrylate group copolymerizes with the polyester resin matrix. This interfacial coupling raises the mechanical strength of the composite, particularly under moisture-exposed conditions where untreated interfaces tend to degrade.
In the production of synthetic marble and artificial quartz, Siwin-M31 enhances both the initial and wet strength of reinforced polyester resin composites. By improving the bond between mineral fillers and the resin matrix, it contributes to more consistent material performance across varying humidity levels. This application serves engineered stone manufacturers supplying commercial construction and residential surface projects.
Siwin-M31 improves the wet electrical properties of mineral-filled and reinforced composites. When incorporated into formulations containing inorganic fillers such as calcium carbonate or alumina trihydrate, it enhances dielectric performance under humid conditions. This makes it suitable for electrical and electronic component applications where insulation resistance must be maintained under varying moisture levels.
As a crosslinking agent for acrylic-type resins, Siwin-M31 improves adhesion and durability in adhesive and coating formulations. The methacrylate group participates in free-radical polymerization with acrylic monomers, while the trimethoxysilyl group provides moisture-activated crosslinking sites that increase coating hardness and substrate adhesion.
Siwin-M31 is supplied in standard industrial packaging. The 210L iron drum holds 200 kg per drum, suited for medium-volume production facilities. For larger operations, the 1000L IBC container holds 1000 kg per unit, reducing handling frequency and packaging waste.
Due to the moisture-sensitive nature of alkoxysilanes, Siwin-M31 should be stored in tightly sealed containers in a dry, well-ventilated area away from direct sunlight and moisture sources. Proper storage preserves product purity and prevents premature hydrolysis of the methoxy groups.
Siwin-M31 is produced under controlled manufacturing conditions with batch-to-batch quality verification. Each production lot undergoes gas chromatography analysis to confirm purity, along with density and refractive index measurements to ensure alignment with published specifications. Product traceability is maintained through batch numbering that links finished goods to raw material sources and production records.
When stored in original, unopened containers under recommended conditions — sealed, dry, and at room temperature — methacryloxypropyltrimethoxysilane typically maintains its specified properties for 12 months from the date of manufacture. Storage beyond this period may result in gradual hydrolysis, particularly if moisture ingress has occurred.
Loading levels typically range from 0.5% to 2.0% by weight of the total formulation, depending on the specific application, filler loading, and desired performance characteristics. Optimal dosage should be determined through formulation trials tailored to individual production processes.
Siwin-M31 contains methoxy groups that undergo hydrolysis in the presence of water. While it can be incorporated into water-based systems, it requires careful formulation control — including pH adjustment and proper mixing procedures — to manage hydrolysis kinetics and prevent premature gelation.
Storage areas should be equipped with appropriate fire extinguishing equipment and spill containment measures. Containers must remain tightly sealed when not in use to prevent moisture contamination and vapor release. Material safety data sheets should be consulted for complete handling and emergency response guidelines.
