Silicone Products

Silane Crosslink Agent Cross-linker Silane Curing Agent Crosslinking Agent

SIWIN has over 15 years of expertise in developing and producing oximino silane crosslinkers for the sealant industry, offering innovative products to global markets.
Siwin offer 4 different types of silane crosslink agents for oxime, acetoxy, alkoxy and acetone based silicone sealants and adhesives.

1.Oximino Silane Crosslinkers:
Unlike acid or alkaline crosslinking systems that release acetic acid or amines, oximino silanes release 2-butanone oxime (MEKO), which reacts neutrally. This makes them ideal for use on sensitive substrates like marble.

The reactivity of SIWIN crosslinkers follows the general trend:
SIWN-TOS > SIWIN-VOS > SIWIN-MOS.
By blending different types of crosslinkers, users can precisely adjust formulation properties such as skin-over time, curing rate, and time to first elastic recovery.

Response to the MEKO Ban in the EU:
In light of the upcoming MEKO ban in the EU, SIWIN has developed innovative low-MEKO and no-MEKO crosslinkers based on acetoxime, methyl isobutyl ketoxime (MIBKO), and 2-pentanoneoxime (MPKO).

2. Acetoxy Silane Crosslinkers:
Acetoxy silicone sealants are known for their strong adhesion to various substrates, fast curing times, short tack-free times, and cost-effectiveness. SIWIN offers high-quality acetoxy silanes, such as MTAS or ETAS silane, which are widely applied in sealing kitchens, bathrooms, and other indoor areas.

During curing, these sealants release acetic acid, resulting in a characteristic vinegar-like smell. This acid can corrode certain materials, such as metals, sensitive electronic components, and natural stone, leading to discoloration or damage. As a result, acetoxy-based sealants are not recommended for these sensitive applications compared to neutral curing sealants.

3. Alkoxy Silane Crosslinkers:
a. For Methanol-Releasing Alkoxy Sealants (e.g., Black, Gray, etc.)
For alkoxy sealants that release methanol during curing, we recommend the following system:
Resin: OH Polymer with a viscosity of 30,000 - 50,000.
Crosslinker: Siwin-931 (Methyltrimethoxysilane).
Catalyst: Siwin-TIC01 (Tetraethoxysilane).

This combination ensures efficient curing, providing excellent flexibility and adhesion, while also enhancing the durability and weather resistance of dark-colored sealants such as black or gray. The use of Siwin-931 ensures a quick and stable curing process, while Siwin-TIC01 acts as a catalyst to promote faster crosslinking.

b. For Ethanol-Releasing Alkoxy Sealants (e.g., Black, Gray, etc.)
For ethanol-releasing alkoxy sealants, we recommend the following formulation:
Resin: OH Polymer with a viscosity of 30,000 - 50,000.
Crosslinker: Siwin-ND43 (Dichloromethyltriethoxysilane).
Catalyst: Siwin-ND22 (Amino-functional silane).

This system is designed for sealants that require a slower curing process and enhanced flexibility. The use of Siwin-ND43, which contains a dichloromethyl group, helps achieve superior crosslinking efficiency and bonding strength, particularly in dark-colored sealants. The catalyst Siwin-ND22 ensures optimal curing speed and provides enhanced moisture resistance, making it suitable for sealants exposed to harsh environments.

c. For Light-Colored Alkoxy Sealants (e.g., Transparent, White)
For light-colored alkoxy sealants, such as transparent or white formulations, we recommend two different systems based on the type of alkoxy endcap used on the resin.
Resin: Alkoxy-endcapped OH Polymer, Siwin-TMOH20000-TMOH80000 (Trimethoxy endcapped OH polymer), with a viscosity ranging from

20,000 to 80,000.
Crosslinker: Siwin-931 (Methyltrimethoxysilane).
Catalyst: Siwin-DBTDL (Tin catalyst).

This system provides excellent transparency and adhesion properties, making it ideal for sealants used in applications where appearance and durability are key concerns, such as in construction or automotive glazing.

Resin: Alkoxy-endcapped OH Polymer, Siwin-DMOH20000-DMOH80000 (Dimethoxy endcapped OH polymer), with a viscosity ranging from

20,000 to 80,000.
Crosslinker: Siwin-931 (Methyltrimethoxysilane).
Catalyst: Siwin-TIC02 (Titanium-based catalyst).

The method provides a slightly slower curing rate, which can be beneficial for applications requiring more workability time. This system is particularly useful for light-colored or translucent sealants that require a high level of transparency and smoothness.

4. Acetone Silane Crosslinkers:
SIWIN is proud to offer an innovative acetone-free silane crosslinking system for moisture-curing silicone sealants. With cutting-edge products that deliver exceptional performance, our solutions have been rigorously tested and approved by leading global companies, including Henkel.

Core Products of the SIWIN Acetone System:
SIWIN-GCF:
Acts as an advanced curing agent.
Enhances the crosslinking density of silicone polymers, leading to improved elasticity, durability, and mechanical strength.
Ensures rapid and efficient curing, even in low-humidity conditions.

SIWIN-VIPS:
Serves as a high-performance crosslinker.
Ensures excellent adhesion to various substrates, including glass, metal, and ceramics.
Contributes to enhanced weather resistance and durability in sealant formulations.

Acetone cross-linker

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