Effect of softening agent on rubber hardness
The main effect of the softening agent is to soften the rubber molecules to reduce the friction between the molecules, thereby increasing the plasticity, or the raw rubber dripping agent, so that the agent easy to evenly dispersed in raw rubber. Softener can make the rubber stains and plasticity, so you can reduce the plastic refining Jane, reduce the energy consumption, so that the material is easy to roll and pressure out.
Effect of softening agent on rubber hardness:
Some softeners, not only play a distant role, but also play other roles, such as stearic acid on the accelerator can activate the role of pine tar can increase the adhesion, and the role of anti-aging, phthalic acid dibutyl The rosin, oleic acid can promote aging, paraffin, wax and other dosage greater than 1%, it will be complex in the rubber surface to form a layer of film, although it still has anti-aging properties, but will reduce the Adhesion.
The ideal rubber softener must be stable and volatile small material trade, easy to mix with raw rubber, and has not to promote the aging of the product, nor to reduce the strength of the product and other properties.
Softener for the impact of different hardness of rubber, the general can be divided into the following three:
1. With the increase in the amount of rubber hardness, such as Vaseline, vegetable oil, sulfurized ointment and so on.
2. Rubber hardness is very small, such as fatty acids and their salts.
3. Do not reduce the hardness, and in conjunction with carbon black when the increase in hardness, such as mineral yellow rubber, pine tar and so on.
Many types of rubber softener, commonly used, such as mineral R rubber, paraffin, stearic acid, coal tar and synthetic products (such as polydiene, diethyl phthalate) and so on.