Filler bonded abrasive

Powder abrasives, bonded abrasives, coated abrasives Filler in refractory cements... 

Important amonnts of cryolite are used in the ceramic indnstry, the greatest consumption occurring in the manufacture of opal glass and enamels. Less widely known is cryolite s extensive nse as a filler for abrasive wheels, especially the resin- and rubber-bonded types. Another apphcation is in flux coatings for welding rods, particularly those used to join aluminum. 

The high modulus with low hysteresis of the treated clays vs. carbon black, as seen in a natural rubber compoimd in Table 7, suggest that the silane mediated polymer-clay bond is stronger than the polymer-black bonds at the carbon black active sites. Deformation results in loss of fewer polymer-filler bonds with the treated elays, so that energy loss as heat is less compared to the carbon black. This stronger polymer-clay bond is also consistent with the higher modulus and abrasion resistance. 

The formation of PPD groups on the polymer backbone provides a mechanism to improve the polymer-filler interactions. The nitrogen-hydrogen bonds are capable of hydrogen bonding with polar groups on the surface of the filler. This enhanced interaction provides for somewhat unique dynamic mechanical properties. Under ideal conditions rolling resistance improves when QDI is used in the mix. Also, abrasion characteristics are maintained and in some cases even modest improvements occur. 

Chem. Descrip. y-Ureidopropyltrimethoxysilane CAS 23843-64-3 EINECS/ELINCS 245-904-8 Uses Adhesion promoter aiding bond between fillers and reinforcements (e.g., fiberglass, particulates, metals) and various polymers (phenolic, urea-melamine, epoxies, polyamide, PU), for use in glass fiber sizes and finishes, wool insulation resin binders, primers, foundry sand binders, adhesives, sealants, and abrasive grinding wheel binders Features Contains no flamm. or combustible solv. low VOC emissions Properties Lt. straw clear liq. sol. in methanol, ethanol, acetone, toluene, methyl Cellosolve, water m.w. 220 sp.gr. 1.15 b.p. 217-250 C (700 mm Hg) flash pt. (TCC) 99 C ref. index 1.386 100% act. Silquest Y-11597 [OSi Spec.]... 

Uses Adhesion promoter aiding bond between fillers and reinforcements (e.g., fiberglass, particulates, metals) and various polymers (phenolic, urea-melamine, epoxies, polyamide, PU) used in glass fiber sizes and finishes, wool insulation resin binders, primers, foundry sand binders, adhesives, sealants, and abrasive grinding wheel binders low VOC emissions... 

As indicated, silane treated (see Section 11.2.6.2) composites have the better abrasion resistance than similar materials containing no silane. That is because the silane bonds the filler to the polymer, creating primary bonds holding the glass or quartz particles in place. 

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