Rubber is a kind of high molecular compound. Because of […]
Rubber is a kind of high molecular compound. Because of its high elasticity at room temperature, it is also called elastomer. There are many types of rubber, such as natural rubber (tires, rubber bands, condoms), butyl rubber (inner tubes, chewing gum), silicone rubber (pacifiers), and so on. Can be divided into natural rubber and synthetic rubber. The earliest application was natural rubber, which was extracted from the liquid in the rubber tree. Raw rubber can be deformed at will by external forces. Like chewing gum, people added sulfur to natural rubber in the early days, and produced chemical reactions between the internal molecular chains of natural rubber for a long time. To form a network structure, the rubber is cured and shaped to maintain a fixed shape. This chemical reaction process is called vulcanization. In order to increase the vulcanization speed, future generations put vulcanization under high temperature and high pressure conditions, and added accelerators to increase the chemical reaction speed of vulcanization. The sulfur above the landlord literally means sulfur, but in the rubber industry usually refers to vulcanizing agents, also known as curing agents, not only sulfur, but also chemical components that can solidify and mold various types of rubber.
Vulcanization refers to adding a vulcanizing agent to the raw rubber.
No vulcanization means that no vulcanizing agent is added to the raw rubber.
Unvulcanized means that the raw rubber has not started the cross-linking chemical reaction.
After vulcanization, does the rubber rubber become very soft and easy to tear, and the unvulcanized one is not easy to tear and is hard?
The amount of vulcanizing agent added to the rubber is very small, about 1%, which has no effect on the physical state of the raw rubber. The physical state of the rubber before vulcanization is a bit like the state of the dough after adding water. The specific physical state is related to the type and amount of fillers and plasticizers added, which is the state of the chewing gum. Chewing gum is a butyl rubber raw rubber with a certain "filler".
EPDM raw rubber is transparent, rubber products are usually black because of the addition of carbon black (general filler for rubber, similar to black ash in the chimney), you can add carbon black without adding carbon black to other products. Color masterbatch.
How is Epdm and NR treated in China? A. How to make grinding powder? The vulcanized rubber is powdered and can be used as a rubber filler. B. How to do recycled rubber? All vulcanized rubbers can be added with a desulfurizing agent. After the chemical reaction treatment, the molecular chains formed by the chemical reaction are broken and reduced to the original rubber state. This process is called desulfurization, which literally understands desulfurization.China Custom Rubber Gaskets
The two processes of grinding powder and recycled rubber need to be carried out by professional manufacturers. It is not necessary for professionals to understand too detailed, you cannot understand the details.