Explanation

Through the action of heat, oxygen, mechanical force or chemical reagent, crude rubber changes from a strong and tough elasticity state to a soft and plastic state. This process that increases flow ability of elasticity materials is called mastication. Its essence is to reduce the molecular weight of rubber and reduce the viscous flow temperature. The mastication crude rubber is called plasticized rubber. Plastic compound has the ability to easily mix and disperse with various additives; Its elasticity is reduced, which is convenient for tape casting and pressing. It makes the shape and size of the rubber blank (semi-finished product) stable. Its surface is smooth, which can make the pattern of the product clear. The adhesion between the rubber material and the fiber skeleton materials is improved. mastication can play the role of "blending", so that the nf plasticity of crude rubber is uniform. mastication is added to speed up the mastication process during plasticizing, which is called "chemical mastication" or "plasticizing mastication". mastication is carried out at a lower temperature (45? 55X:). In addition to the roll temperature, the factors affecting mastication include roll spacing, rotational speed, speed ratio, mastication time, mastication capacity, drum working length, cutting times and methods, and parking time. mastication is expressed as plasticity. The measurement methods of plasticity (flow ability) can be divided into compression type (such as Wechsler Velocimeter, Deval Plastimeter and Wallace Rapid Plastimeter), rotary type (such as Mooney Viscometer), flower type (such as capillary tube rheometer) and Brabender Plastimeter (dual rotor torque rheometer). At present, rubber processing plants mainly use the Wechsler plastometer (the plastometer is a dimensionless quantity from 0 to 1, and the larger the value, the higher the plasticity and the better the flow ability), while synthetic rubber uses the Mooney viscometer

Classification