KH-570 Methacryloxy Silane (3-Methacryloxypropyltrimethoxysilane): UV-Cure Adhesion Chemistry for Coatings, Dental and Optical Applications

What KH-570 Is and How It Works

MOON-KH570 is 3-methacryloxypropyltrimethoxysilane — a methacryloxy-functional silane coupling agent with the CAS number 2530-85-0. Like other silanes it has two chemically distinct ends, but its second end behaves differently from amino or epoxy silanes:

• A tri-methoxy silane end that hydrolyses in the presence of water to produce silanol groups (Si–OH), which condense with hydroxyl groups on inorganic surfaces (glass, metal oxides, silica, mineral fillers) to form stable Si–O–Si or Si–O–M covalent bonds.
• A methacrylate (acrylate) end carrying a polymerizable C=C double bond. Instead of reacting with a curing agent, this double bond participates directly in the free-radical polymerization of acrylic, methacrylic, vinyl ester and UV-cured resin systems — becoming chemically part of the polymer network as it cures.

The result is a continuous chemical bridge at the interface — but unlike KH-550 or KH-560, KH-570 is designed for systems that cure by light, heat or peroxide rather than by condensation or epoxy addition. It is the standard choice for UV-curable coatings, dental composites and optical adhesives where the silane must be locked into the cured film.

Technical Specifications

TDS and MSDS are available on request. COA is issued for every production batch.

KH-550 vs KH-560 vs KH-570: Which Silane Do You Need?

KH-550, KH-560 and KH-570 are the three most widely used silane coupling agents. All improve adhesion at the polymer–filler or polymer–substrate interface, but each targets a different resin chemistry. Choosing the right one depends on how your system cures.

KH-570 is often combined with KH-560 or KH-550 in hybrid systems — for example, an epoxy primer (KH-560) topped with a UV-curable clearcoat (KH-570) — to couple different layers to the same substrate.

Typical Applications

How to Use It

KH-570 can be incorporated in three ways depending on the formulation and process:

1. Direct addition to the resin phase — add KH-570 directly to the acrylic/UV resin and stir thoroughly before cure. Suitable for solvent-free and low-water systems; the methacrylate end then copolymerizes during curing.
2. Pre-hydrolysed aqueous/alkanol solution — for waterborne systems or surface treatment: dilute KH-570 in a water/ethanol mixture (1:1 to 1:3 ratio), adjust to pH 4–5 with acetic acid, stir for 15–30 minutes to allow hydrolysis, then add to the formulation or use to treat the substrate.
3. Filler pre-treatment — dilute KH-570 in ethanol or acetone (1–5% solution), spray onto mineral fillers, pigments or glass fiber, mix thoroughly and dry at 80–100°C before incorporating into the resin.

Typical dosage is 0.5–2% by weight of the total formulation, or 0.5–1.5% by weight of filler. Because the optimum level depends on filler surface area and resin type, we recommend a trial batch with three dosage points (0.5%, 1%, 2%) to establish the right level for your process.

Packaging, Quality & Lead Time

• Packaging: 200 kg iron drum · 1000 L IBC (950 kg)
• Batch Testing: Assay, density and refractive index against specification above
• Documentation: TDS and MSDS supplied with every batch. COA issued per batch on request.
• MOQ: 800 kg for commercial orders; 1 kg free sample available
• Lead Time: 7–15 days for standard packaging (FOB Shanghai)
• Storage: Sealed container, away from moisture, heat and direct sunlight. Recommended temperature 5–30°C. Shelf life 12 months under proper storage.

Frequently Asked Questions