What is the role of softening plasticizers in rubber? How are they classified?
A rubber plasticizer is a reagent. Rubber plasticizer refers to add certain substances in rubber, can make the force rubber molecules is reduced, thereby reducing the glass transition temperature of the rubber, the rubber plasticity and fluidity, easy calendering and extrusion molding operation, but also can improve the mechanical properties of the vulcanizate of some physical machines, such as the decrease of hardness and elastic constant tensile stress, with high and low heat, improve the cold tolerance.
Plasticized formulations can also classified by the sources of petroleum, coal tar plasticizer plasticizer, turpentine, plasticizer, plasticizer and synthetic fatty plasticizer.
The plasticizer used in the production process should meet the following conditions: good plasticizing effect, low dosage, quick absorption, good compatibility with rubber, low volatility, no migration, cold resistance, water resistance, oil and solvent resistance, heat resistance, light resistance, good insulation, good flame resistance resistant bacteria, colorless, non-toxic, cheap and so on.But in fact, it is impossible to fully satisfy the above-mentioned conditions of plasticizers. Therefore, in actual use, more than two or more kinds of plasticizers mixed use, in order to make up for each other, where the amount of commonly known as the main plasticizer, and the other called auxiliary plasticizer.
The plasticization of rubber can be done in a physical and chemical manner. The chemical plasticizer including the plasticizing plasticizing plasticizing process, which belongs to the rubber processing, internal plasticization in synthetic rubber, through the chemical reaction on the rubber chains into molecular structure flexibility, plasticity to achieve. Chemical plasticization will not be lost because of the volatilization or precipitation of plasticizing substances, and the plasticizing effect is long. Therefore, more and more attention has been paid to it. Physical plasticization refers to the purpose of increasing plasticity by means of additional substances. The term "plasticization" is usually referred to as physical plasticization, and the added substance in physical plasticization is called softening plasticizer.
Rubber plasticizer refers to add certain substances in rubber, can make the force rubber molecules is reduced, thereby reducing the glass transition temperature of the rubber, the rubber plasticity and fluidity, easy calendering and extrusion molding operation, but also can improve the mechanical properties of the vulcanizate of some physical machines, such as the decrease of hardness and elastic constant tensile stress, with high and low heat, improve the cold tolerance.
