Silane coupling agent 570/A-174/Z-6030/KBM-503

Product description

Structural formula:

Empirical formula: C10H20O5Si

Molecular weight: 248.4

CAS No.: 2530-85-0

Chemical name:

γ-Methacryloxypropyltrimethoxysilane

Properties

GX-570 is a bifunctional silane possessing a methacrylic organofunctional group and a tri- mehoxysilyl inorganic group. The dual nature of its reactivity allows it to bind chemically to both inorganic materials (e.g. glass, silica) and organic thermoset resins thus functioning as adhesion promoter, co-monomer for polymer synthesis, crosslinker, and surface modifier.

The use of GX-570 as a coupling agent in glass fiber-reinforced or filler-modified plastics improves filler dispersibility while reducing the filler's sedimentation tendency. It also results in a major reduction in the melt viscosity of casting resins, as well as a marked improvement in the mechanical properties of glass-fiber-reinforced or mineral-filled plastics. In addition, use of GX-570 in these materials leads to a sizable increase in moisture (vapor) resistance as well as greater resistance to acids and bases. Used as a co-monomer in

polymers, GX-570 produces binders that exhibit much improved wet scrub, abrasion and scratch resistance because of crosslinking and strong adhesion to the base. As a component of free-radical curable adhesives and sealants, it leads to improved mechanical properties and enhanced substrate adhesion.

GX-570 is a clear, colorless, light and heat sensitive liquid with a characteristically sweet odor. It is soluble in alcohols, and alitic or aromatic hydrocarbons.

Technical data

Reactivity

GX-570 is highly miscible with standard organic solvents, such as alcohols, and acetone, but practically is insoluble in neutral water. However, by adjusting the to between 3 and 4 with a hydrolysis catalyst (e.g. acetic acid), an aqueous solution of up to 5 percent by weight can be obtained. The resulting clear solution should be used as soon as possible (within 1-2 days), before siloxane formation has proceeded too far. Deactivation of GX-570 by siloxane formation is ouding of the aqueous solution.

The hydrolysis of alkoxy group produce methanol and reactive silanol (Si-OH) groups

which can bond to a variety of inorganic substrates. The methacrylate groups interact with the polymer. Examples of suitable inorganic substrates are glass, glass fibers, glass wool, mineral wool, silicic acid, quartz, sand, cristobalite, wollastonite, silicate fillers, metal oxides and metals. Examples of suitable polymers include unsaturated polyester, vinyl esters and acrylates.

Application and performance

GX-570 is used as adhesion promoter in application such as:

² A constituent of glass fiber sizes (glass fiber fillers for unsaturated polyester resins and polyolefins).

² A finish for glass fabrics used in unsaturated polyester resins.

² As a surface modifier for pigments and fillers for thermosets (unsaturated polyester, such as MMA), thermoplastics (such as polyesters and polyolefins) and elastomers.

² As an additive for filler, peroxide- crosslinked elastomers.

² As an additive for casting resins (un- saturated polyester, MMA).

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