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Natural regeneration of rubber
The process of converting plastic rubber into elastic rubber is called vulcanization, which is a certain amount of vulcanizing agent added to the semi-finished products made of raw rubber in the vulcanization tank, at a specified temperature for heating, heat to make raw rubber linear molecules Through the formation of "sulfur bridge" and cross-linked into a three-dimensional network structure, so that the plastic compound into a high elasticity of the vulcanized rubber. Since the crosslinking bond is mainly composed of sulfur, it is called "vulcanization". So all can make the linear structure of plastic rubber into a three-dimensional network structure of the elastic rubber process is called vulcanization, where the rubber material in the "bridge" role of the material are called "curing agent" (Atmananda yoga mat Of the curing agent is the choice of high-grade non-toxic cosmetics production process of the blending agent). After the vulcanization of rubber called vulcanized rubber, also known as soft rubber, commonly known as "rubber." Vulcanization is one of the most important processes in rubber processing, and various rubber products must be vulcanized to achieve the desired performance. The vulcanized rubber is of no use value in use, but the degree of vulcanization is not enough, the vulcanization time is not enough to reach the optimum state and the vulcanization time is exceeded, and the performance is remarkably lowered to degrade the rubber properties. So the production process must be strictly controlled curing time to ensure that the vulcanized rubber products with the best performance and longest service life.
Natural regeneration of rubber is a powder with a mixture of carbon black, etc., dispersed in the composition of the multi-phase mixed dispersion system. In the mixed dispersion system, the powdery compounding agent is non-continuous distribution, called the dispersed phase; and the rubber is continuously distributed, is the main dispersion medium.
From the point of view of physical chemistry, according to the nature of the compound, from the dispersion of most powder compounding agent, the compound should belong to the colloidal mixture system. This is because most of the powdered compounding agents such as carbon black in the compound are neither a suspension composed of coarse particles dispersed in raw rubber nor a solid solution dispersed in a molecular state, but in a colloidal dispersion Disperse phase size, but also slightly larger than the colloidal dispersed size of the fine dispersion of dispersed in the composition of the multi-component mixed dispersion system, and showed the characteristics of colloidal solution. For example, the dispersion state has thermodynamic instability, when the thermodynamic conditions change, the dispersed phase will be re-coalescence dispersed dispersion dispersed, and the compound has a birefringence of light.
However, the mixed rubber and general low molecular colloidal mixed system in the structural performance is significantly different. First of all, is the rubber because of its own viscosity is too large, resulting in its dispersion of the state of the thermodynamic instability is generally not obvious. Second, the compound is mixed in the composition of the media is more complex, not only as the main component of the raw rubber is often more than one, such as raw rubber, and raw rubber, recycled rubber, etc .; also dissolved in raw rubber of various liquid softening Agents, plasticizers, and some other organic complexing agent; and then part of the dissolved sulfur and so on, which constitutes a unique composite compound dispersion medium.
In addition, a certain degree of binding has been produced at the interface of the two phases, and this effect can even be maintained until the vulcanization of the compound, which not only affects the processability of the compound, but also affects the properties of the vulcanizate and the product. In this sense, the compound has a structural characteristic similar to that of vulcanized rubber, but it is essentially different from the vulcanizate. The compound still has the plastic flow and deformation properties of the linear polymer material. Therefore, the compound is a colloidal mixed dispersion system with complex structural properties.