Softener is an additive used to improve the performance and processing properties of rubber. It can increase the plasticity of the rubber compound, reduce the viscosity of the rubber compound and the temperature during mixing, improve the mixing and dispersibility, and increase the elongation of the vulcanized rubber. Rate, wear resistance and tensile strength. Softeners are similar in function to plasticizers, except that plasticizers are chemically synthesized and used primarily in plastics and resins, while softeners are mostly derived from natural materials and are used almost exclusively in rubber.
Softeners can be classified into physical softeners and chemical softeners. Chemical softeners can cut off the molecular chain of a few rubber hydrocarbons and are a weak peptizer. Physical softeners mainly weaken the intermolecular forces of rubber hydrocarbons and act as lubricants. More commonly used in the industry are physical softeners, which are mainly classified into the following categories according to their sources.
1 Pine oil softener is a product obtained from turpentine, such as pine tar, rosin, tall oil, wood asphalt and the like.
2 Fatty oil softeners are natural oils and their derivatives, such as vegetable oils, fatty acids and ointments.
3 coal tar softeners include coal tar, coumarone resin and coal tar pitch.
4 petroleum softeners are mainly complex mixtures of paraffins, naphthenes, aromatics and a small amount of asphalt materials, nitrogen-containing organic bases and the like.
The following points should be considered when choosing a softener:
1 non-toxic, tasteless, odorless.
2 sources are easy and the price is cheap.
3 It has good compatibility with rubber and good compatibility, and does not affect the physical and mechanical properties of rubber.
4 high boiling point, not volatile, chemically stable.
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