Binding agent questions about the abrasive wheel

1) unstable quality resin, the resin of free phenol content fluctuated. That so-called residual free phenol in the resin of phenol, the formula C6H5OH, make long-term heating cleaved from the resin hardened, the impact strength of the wheel;

2) resin powder mixed with hexamine uneven school called methenamine hexamethylene tetramine ((CH2) 6N4), as the resin hardener, methenamine insufficient amount is added, the resin is not cured complete wheel impact strength and hardness; content is too high, the excess hexamine does not bind to the resin, volatile decomposition in the hardening process, the grinding wheel pores increase, reducing its strength and hardness. Hexamine resin powder and uneven mixing, the consequences of high levels of low ie methenamine harm;

3) binding agents granularity is too coarse, the general view size binder to fine is appropriate, which is conducive to the bonding agent is distributed uniformly in favor of hardener full contact.

The particle size is too coarse, the molding material is difficult to mix uniformly, impact strength and hardness of the grinding wheel. Even for coarse-grained resin sheet cutting wheel and cymbals shape grinding wheel in terms of its choice of binder (resin powder) particle size should be finer than 320 #. Wheel manufacturing granular product size requirements for the binder a few microns.