Cloth rubber shoes are made of fiber material as the upper, rubber as the outsole material, and processed by pasting, heat vulcanization and other methods. Reclaimed rubber can be used alone or in combination with natural rubber and synthetic rubber to produce rubber parts of rubber shoes, which can effectively reduce the cost of raw materials. When using reclaimed rubber to prepare the rubber parts of cloth-covered rubber shoes, during the vulcanization process, it is necessary to reasonably control the vulcanization temperature and time, master the vulcanization conditions, and improve the quality of the finished product.

1. The vulcanization temperature and heating method of the rubber parts of rubber shoes produced from recycled rubber

(1) Vulcanization temperature: The vulcanization of rubber shoes is mainly based on hot air vulcanization, and the vulcanization temperature is generally controlled at 128-136 °C. In actual production, during the vulcanization process of rubber shoes, the oxygen in the air oxidizes the rubber surface, and this oxidation is intensified with the increase of temperature; at the same time, the upper material of rubber shoes has limited ability to withstand high temperature, and excessive temperature It will cause a decrease in strength and a change in the quality of synthetic materials. Therefore, when using reclaimed rubber to produce the rubber part of cloth-top rubber shoes, the vulcanization temperature needs to be limited within a certain range.

(2) Heating method: Different rubber parts in cloth rubber shoes have different degrees of friendliness. In order to reduce the temperature difference between rubber parts and avoid the phenomenon of rubber parts collapse and deformation due to softening caused by sudden feeding of high-temperature air, rubber shoes The temperature rise time during vulcanization should be carried out in stages, and the temperature should be raised every certain time, that is, the temperature should be gradually raised.

2. The vulcanization time of rubber parts of rubber shoes produced from recycled rubber

The vulcanization of rubber shoes is carried out in a vulcanization tank. When reclaimed rubber is used for the rubber parts of cloth rubber shoes to reduce costs, the required vulcanization time is longer, generally 45-60 minutes. In actual production, the heat transfer of hot air HYL12Y4YESYC is much slower than that of model vulcanization, so the equivalent vulcanization time is correspondingly longer. At the same time, the unvulcanized rubber shoes are put into the vulcanization tank at normal temperature, and then vulcanized with a heating medium, so the heating process is much longer than that of the model vulcanization.

3. Vulcanization pressure of rubber parts of rubber shoes produced from recycled rubber

When using reclaimed rubber to prepare rubber parts for cloth-covered rubber shoes, proper vulcanization pressure can ensure the compactness of the rubber material, and then ensure the bonding strength between the rubber parts and between the rubber parts and the upper material. In the case of higher temperature, the greater the air pressure will also increase the destructive effect of oxygen on rubber, so the vulcanization pressure of rubber shoes in the vulcanization tank should be around 0.3MPa. The vulcanization pressure needs to be kept constant within the specified range at all stages of vulcanization.

4. Common vulcanization conditions for the rubber parts of cloth-covered rubber shoes produced from recycled rubber

When using reclaimed rubber for the rubber parts of cloth-covered rubber shoes to reduce costs, if the rubber shoes are vulcanized with mixed gas, the steam pressure is generally controlled at 0.4-0.5MPa, and the compressed air is 0.3MPa; the curing time is controlled between 45-60min; Heating up, the temperature in the vulcanization tank is controlled between 130-135°C.

In actual production, the physical properties of different rubber parts of cloth rubber shoes are different, and different proportions of reclaimed rubber can be mixed. The follow-up editor will continue to share with you the key points of the formula design of each rubber part of cloth rubber shoes mixed with reclaimed rubber and the vulcanization reference formula .