Plasticizing properties of several glues:When natural rubber is plasticized with an open mill, the roller temperature is 30-40 ° C, and the time is about 15-20min. When using an internal mixer to plasticize, the time is about 3-5min.The Mooney viscosity of styrene-butadiene rubber is mostly between 35-60. Therefore, styrene-butadiene rubber can be used without plasticizing, but the...