The relationship between vulcanizing agent time, temperature and accelerator

Industrial products are often pursued in the production of lower temperature, short curing time. When the curing time is too long, it is often arbitrary to increase the accelerator, or increase the curing temperature, but the actual practice is not right.

1, because the temperature of rubber vulcanization agent is determined by the variety of rubber, such as the best vulcanization temperature of natural rubber is 145-148 degrees, butadiene, butadiene glue, butadiene glue is the best vulcanization temperature of 148-153 degrees, silicone rubber vulcanization temperature of 170-175 degrees. In the actual operation should test the filter temperature adjustment temperature in this basis generally plus 3-5 degrees. The setting of vulcanization temperature should not be changed. Such changes will certainly affect the physical properties of rubber. At the same time, there will certainly be some problems in the production process.

2, curing time is set with the thickness of the product and operation requirements to set. Because rubber conducts heat very poorly. The thicker the product, the longer the curing time. Curing time setting should be different filtration products and set different curing time. Long fluidization time of thin products is a waste of productivity and energy. The curing time of thick products is too short, and the quality is seriously affected by the immature outside coke.

3, in order to improve the speed of curing, there are generally two ways to first is heating, and another is to increase the amount of accelerator or use super super accelerator, such as heating on the physical properties of the product is not high can be tested filter. But it's hard to control. Because according to the theoretical calculation, every increase of 10 degrees curing time is reduced by less than half of the time. If we raise the temperature, we should also calculate how much temperature we should raise. Increasing or decreasing the accelerator to adjust the fluidization speed is a common method, it must be set in the temperature and time, and then increase or decrease the accelerator to adjust. It is important to adjust the accelerator because the solubility of the accelerator and sulfur in rubber is very small. And when it's over its solubility it comes out and it sprays. And there must be a great change in physical properties.

Practice has proved that. The amount of general ordinary product accelerator should be as little as possible. Adding or subtracting accelerators should not be done in proportion. Should add or subtract second. The third promoter, improve the activation performance. In this way, the problem of spraying accelerators can be effectively controlled, so as not to affect the physical properties and stability of the product. Increased productivity cannot be measured solely by reducing curing time. Generally, manufacturers are from the operator to increase the number of operating molds to test the filter.