Publish Time: 2022-09-07 Origin: Site
Rubber needs to be vulcanized after being mixed in a rubber mixer. After vulcanization of rubber, due to various reasons, bubbles of different sizes may appear on the surface of the sample, and bubbles will also appear after cutting. The following is a brief introduction to rubber compounding. Causes and solutions of bubbles on the surface after vulcanization.
Here is the list
The main cause of bubbles on the vulcanized surface of rubber
The solution to the bubbles generated on the vulcanized surface of the rubber
What should we pay attention to when choosing an oil temperature machine for a rubber mixer?
1. The compounding agent and the raw rubber are not fully mixed and dispersed or the operation is wrong during mixing;
2. After the rubber sheets are mixed, the parking is not standardized and the environment is unsanitary;
3. The rubber compound has moisture, which can be solved by adding an appropriate amount of calcium oxide during mixing in the internal mixer;
4. Insufficient vulcanization will produce bubbles;
5. Insufficient vulcanization pressure leads to rubber foaming;
6. There are too many impurities in the vulcanizing agent, small molecular impurities are decomposed in advance, and air bubbles will remain in the rubber;
7. The rubber product is too thick and the rubber material is too small, the heat transfer of the rubber material is slow, and the fluidity of the rubber material decreases after the surface vulcanization, resulting in lack of material and bubbles;
8. There is an abnormality in the exhaust process during the vulcanization process, or there is a problem with the formula. The vulcanization system needs to be improved.
Solution: increase the vulcanization pressure and time of the rubber compound, prolong the vulcanization time or increase the vulcanization speed, use an open mill for several times before vulcanization, and finally increase the number of exhausts during vulcanization. The above are the reasons and solutions for the appearance of bubbles on the surface of rubber after mixing and vulcanization. For more rubber and plastic mixing knowledge, please continue to pay attention to Baina.
The mixing of the raw rubber by the internal mixer is carried out under high temperature and high pressure, so that the rubber material and the compounding agent are fully mixed and dispersed before entering the next process. The common heating methods of internal mixers include electric heating, oil temperature machine heating, etc. The following is a brief introduction to the matters needing attention in the selection of internal mixer oil temperature machine.
The internal mixer oil temperature machine heats from normal temperature to high temperature relatively quickly. Generally, the oil temperature machine of the internal mixer is generally a 300 ℃ oil temperature machine. The mixer can be heated to about 260℃. If the heating power of the internal mixer is not enough or the speed is relatively slow, you need to use an oil temperature machine to heat the constant temperature
Size analysis of rubber internal mixer: The size unit of internal mixer is liter. Hongxiang internal mixer is usually divided into 0.5L, 1L, 1.5L and other large internal mixers, such as 55L~150L. Different sizes of mixers will also have different power. Therefore, the selection of rubber mixer oil temperature machine needs to consider heating power, temperature and many other aspects. For more rubber and plastic mixing knowledge, please continue to pay attention to Baina.
Seahawk Machinery can provide customers with a full range of customized product solutions and turnkey projects for rubber and plastic production lines. Products are exported to Russia, South Korea, Mexico, India, Vietnam, Thailand, Dubai, Turkey and other places.