As a Steel Cord Conveyor Belt Manufacturer, let's share with you the positive vulcanization method for conveyor belts.
At present, the method for determining the degree of vulcanization of Generic Conveyor Belt can be generally divided into three categories: physical one chemical method, physical-mechanical property method, and test instrument method. These methods measure the degree of vulcanization of the rubber compound from different angles.
1. Physical-chemical method: Free sulfur determination method By measuring the free sulfur content in vulcanized test pieces with different vulcanization times, the curve of free sulfur and corresponding time at different times can be made, and the corresponding time when the free sulfur amount is the least And the mouth is the theoretical positive vulcanization time, but the method is not suitable for the non-sulfur vulcanization system rubber compound, wherein the swelling method: determining the equilibrium swelling ratio of the rubber compound in different vulcanization time, the vulcanization time corresponding to the lowest equilibrium swelling rate is the positive vulcanization time;
2. Physical and mechanical properties: The change of physical and mechanical properties is closely related to the degree of crosslinking. The tensile stress at low elongation is proportional to the crosslink density, positive relationship with hardness, and tensile strength and tear strength. The mechanical properties are in a peak relationship. The use of the product often depends on the performance, so when there is no vulcanization instrument in the early stage, people use the physical and mechanical properties to determine the degree of vulcanization of the conveyor belt compound, so this method can be considered as a continuation of the early determination method. Although different key physicomechanical properties may be required for different articles, the time corresponding to the optimum physical and mechanical properties may be selected and the vulcanization time is included, including the following methods:
Rubber Conveyor Belts
1. Tensile strength method: the maximum value of the tensile strength or the time corresponding to the starting point of the flat region of the curve is taken as the positive curing time;
2. Compression permanent deformation method: determining the compression permanent deformation value of the rubber compound with different vulcanization time, and the time corresponding to the turning point or the inflection point of the compression set time curve of the heat-resistant conveyor belt is the corresponding time of the positive vulcanization point;
Vulcanization is a complex chemical reaction process between rubber and cross-linking system auxiliaries. Temperature is a necessary condition for cross-linking reaction. The vulcanization temperature is high, the vulcanization rate is fast, and the production efficiency is high. On the contrary, the vulcanization rate is slow and the production efficiency is low. Therefore, it should be discussed. Factors affecting the vulcanization temperature. The most important factors are the type of rubber and the vulcanization system. The influence of Rubber Conveyor Belts mainly reflects two aspects: one is the sensitivity of temperature to the reaction, and the other is its resistance to temperature.