Application And Characteristics Of Talcum Powder In Food

2021-10-16

Talc powder can improve the thermal stability of composite aluminum-based grease, and the epitaxial decomposition temperature of the base grease is significantly lower than that of grease containing talc;

Talc powder can improve the tribological properties of composite aluminum-based grease, that is, improve the stability of the friction process, reduce the friction coefficient and wear volume; with the increase in the mass fraction of talcum powder, the friction coefficient and wear volume experience first When the mass fraction of talc powder is 1.0%, the average friction coefficient and wear volume are the smallest; the talc powder can form a dense lubricating film on the surface of the friction pair, and part of the talc powder can repair wear marks and micro Polishing plays an effective anti-friction and anti-wear effect;

Lubricating grease with 1.0% mass fraction of talc powder is most likely to be applied to food equipment and other fields.

Talc powder is a layered silicate, which can be adsorbed on the surface of the friction pair during the friction process, which is equivalent to the sliding of the “sliding bearing”, so as to reduce friction and reduce wear.

From the perspective of the thermal stability of the grease, when the degradation temperature is reached, the remaining weight of the grease sample containing talc is higher than that of the base grease. This is because the main components of talc are MgO and SiO2, among which the heat of SiO2 It has good stability and can improve its thermal stability. Since a large amount of heat is easily generated during the friction process, the thermally stable SiO2 tends to stay in the gap of the friction pair. Due to the surface roughness of the steel plate, the actual contact area between the steel ball and the steel plate is small, and it bears high contact stress in the early stage of the friction process, which is prone to large friction and produces ravines on the surface of the wear scar, so some talc powder (Mainly SiO2) During the friction process, it can repair the grooves generated on the surface of the wear scar, thereby increasing the contact area between the friction pairs and reducing the contact stress between the friction pairs. At the same time, SiO2 is a commonly used polishing material, so a small amount of SiO2 can A micro-polishing effect is produced on the surface of the friction pair, thereby achieving the effect of reducing friction and reducing wear.

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