When natural rubber vulcanized with sulfur has a problem of sulfur injection, the first reaction of many rubber product manufacturers is to use more sulfur, and then start to adjust the amount of sulfur in the formulation, but sometimes it is still difficult to achieve the desired effect. This is because there are many reasons that cause natural rubber to spray sulfur. Rubber product manufacturers need to analyze the cause of sulfur spray by judging the manifestation of sulfur spray, and then take certain measures to solve the problem of sulfur spray according to the reason.
1. The whole natural rubber is sprayed with sulfur
In the production process of natural rubber products, if sulfur is precipitated on the entire surface of the rubber, it is basically because the amount of sulfur is too much, which exceeds its saturated solubility limit or supersaturated solubility limit in rubber. It is necessary to appropriately reduce the amount of sulfur in the formula, or Sulfur is used in combination with other types of vulcanizing agents. You can also use sulfide in an appropriate amount or increase the amount of accelerator. It should be noted that too little sulphur and severe sulphur deficiency in natural rubber products can also cause natural rubber products to spray sulphur. Generally, 1-2 parts of sulfur can be used in 100 parts of natural rubber, and the sulfur will not spray out.
2. Partial vulcanization of natural rubber
If the natural rubber vulcanization occurs locally, it is usually caused by uneven sulphur dispersion and excessive local sulphur consumption. Rubber product manufacturers need to take measures to avoid local accumulation of sulphur 2LLYY91. For example, use dispersants to promote the uniform dispersion of sulfur, appropriately reduce the mixing temperature, and improve the uniformity of mixing. In actual production, mixing sulfur at the lowest possible temperature can effectively prevent natural rubber unvulcanized rubber from spraying sulfur. Adding some softeners before adding sulfur to promote dispersion can also reduce the probability of sulfur spraying.
3. Choosing the right raw materials can avoid sulfur injection
In order to avoid the problem of sulfur injection in natural rubber products, rubber product manufacturers can use insoluble sulfur to fundamentally reduce the probability of sulfur injection. Rubber product manufacturers can use a small amount of selenium in the sulfur to reduce the phenomenon of sulfur spraying; add an appropriate amount of channel carbon black to the reinforcement filling system to reduce sulfur spraying. It is worth mentioning that at present, many natural rubber product manufacturers use reclaimed rubber in the production of rubber products, such as latex reclaimed rubber or tire reclaimed rubber. The addition of reclaimed rubber can also effectively avoid the problem of natural rubber vulcanization. It can reduce vulcanization reaction, improve vulcanization flatness and scorch safety.
There are many reasons for vulcanization of natural rubber, and there are many ways to solve the problem of vulcanization of natural rubber. Rubber product manufacturers must analyze specific problems in detail, and proceed from reality by adjusting product formulas, production processes, and using reclaimed rubber. The method reduces the natural rubber sulphur spray, improves the production efficiency and yield of natural rubber products, and avoids unnecessary losses.
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