In order to improve the heat resistance and mechanical strength of the phenolic resin binder in the diamond grinding wheel, in the preparation process of the resin abrasive, the purpose of modifying the phenolic resin is achieved by adding various fillers. For example, adding copper powder can improve the heat resistance of the resin; adding zinc oxide, chromium oxide and the like can improve the mechanical strength of the resin; adding soft materials such as flaky graphite and molybdenum disulfide to improve the resin bond grinding The grinding performance has a good improvement.
However, the most effective method for improving the performance of phenolic resins is to add modifiers of organic substances, which may be because organic substances are more compatible with phenolic resins in terms of material structure and surface properties than inorganic substances.
Polyimide resin is one of the most heat-resistant resins. The use of polyimide resin as a binder to prepare diamond grinding wheels first appeared in the United States, and was subsequently promoted worldwide. Its biggest feature is the heat of the grinding wheel. Good stability, long-term use at 250 °C, durability is much higher than phenolic resin bond grinding wheel, often used for loading and grinding of super-hard abrasive grinding wheel.
Epoxy resin has good water resistance and strong adhesion, but its heat resistance is low. It is usually mixed with phenolic resin or polyimide resin during the preparation of abrasive tools without reducing the resistance of the material. On the basis of heat, the bond strength of the resin binder can be increased. Polyurethane-based resins are also low in heat resistance, but the abrasives produced by them have high strength and are generally suitable for light grinding.