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Determination of rubber fender vulcanization time
- Jul 23, 2018 -

Since rubber is a poor conductor of heat, the temperature at which the rubber fender contacts the heat source portion at the time of vulcanization is high, and it takes a certain time to reach the heat source temperature away from the heat source portion. That is, the temperature of each component in each part is different at a certain moment. The vulcanization effect obtained during the same curing time is also different. And as the thickness of the rubber fender increases, this phenomenon becomes more apparent. In order to correctly determine the vulcanization process conditions of the rubber fender and the compound formulation of each layer of rubber, it is often necessary to first formulate a vulcanization process condition, and then vulcanize the rubber fender under the vulcanization process conditions. At the same time, the change of the temperature of each layer with the vulcanization time was measured, and the vulcanization effect of each layer was calculated, and compared with the allowable vulcanization effect of the vulcanization tester on the vulcanizer. If the actual vulcanization effect of each subbing layer is within the allowable range, the proposed vulcanization process conditions are considered to be suitable. Otherwise, the vulcanization process conditions should be adjusted for each rubber layer compound formulation. Specifically, it can be divided into the following three steps:

1. Determine the vulcanization conditions and vulcanization flatness of the test strips of the rubber fenders on the vulcanizer. Calculate the vulcanization temperature coefficient and the allowable minimum vulcanization effect and maximum vulcanization effect.

2. According to the characteristics of the formula of the rubber fender rubber compound and the long-term accumulated practical experience, a preliminary vulcanization condition of the product is prepared, and the product is vulcanized under the vulcanization process condition.

3. The temperature change of each layer in the rubber fender during the vulcanization process, and then calculate the vulcanization effect of each layer.