The regeneration process of reclaimed rubber is that the waste rubber breaks the molecular chain of the vulcanized rubber under the combined action of softeners and activators, oxygen, heat and mechanical shearing. Therefore, it is inseparable from the plasticizer that functions as a plasticizer and expander. At the beginning of the development of the reclaimed rubber industry, the commonly used regenerative softener was coal tar, but with the continuous progress of reclaimed rubber technology, the country has now explicitly prohibited the use of coal tar to produce reclaimed rubber. Why is this?
1. Coal tar is a black or dark brown viscous solid with irritating odor produced during coal retorting. It mainly consists of low-temperature coal tar, medium-temperature coal tar and high-temperature coal tar. The main components are phenols and alkyl aromatics. Hydrocarbons, naphthalene, anthracene, pyridine, pitch, etc. When coal tar is used to produce reclaimed rubber, it will produce unpleasant irritating odors. At the same time, rejuvenated rubber will produce substances harmful to the human body. The spread of these toxic substances to the environment will not only pollute the environment, but also cause environmental pollution. Affect human health. Therefore, in order to protect the environment and protect its own health, the use of coal tar to produce reclaimed rubber must be eliminated.
2. Coal tar itself is a complex mixture of hydrocarbons with high aromaticity, containing a large number of polycyclic, fused ring compounds with or without side chains, heterocyclic compounds containing oxygen, sulfur, and nitrogen, and a small amount of aliphatic hydrocarbons, Cycloalkanes and unsaturated hydrocarbons, when used in the production of reclaimed rubber, will not only produce irritating odors and harmful substances, but also produce polycyclic aromatic hydrocarbons in reclaimed rubber products that cannot meet international environmental standards. Therefore, the scope of use of reclaimed rubber products is significant. Shrinking; Regardless of whether it is international or domestic, the rubber products industry is increasingly demanding environmental protection. Therefore, reclaimed rubber that does not meet environmental standards has no market at all. Therefore, from the viewpoint of environmental protection and development, the use of coal tar potential in reclaimed rubber is prohibited. Imperative.
Although the use of coal tar to produce reclaimed rubber is low in cost and high in efficiency, the tensile strength and elongation at break of the reclaimed rubber produced are high, but if the reclaimed rubber produced does not meet the international environmental protection standards or national tasteless standards, then the indicators Even higher can't meet market demand. What's the use of production? Therefore, whether it is from the perspective of environmental protection, health, or use, the production method of coal tar as a softener to produce reclaimed rubber must be prohibited.
Although coal tar is banned in the production of reclaimed rubber, more and more new types of softeners are emerging. Many reclaimed rubber manufacturers have begun to use vegetable oils or biomass softeners to soften them. The properties of reclaimed rubber produced are more stable. The use of a wider range. For example, a special environmentally-friendly tire reclaimed rubber with tall oil as a softener, using German technology and infrared desulfurization process, produced by the tire reclaimed rubber products meet the EU RACH testing standards, can be used to produce a variety of pollution-free, no radiation, no Infiltration of export-oriented rubber products, reducing raw material costs.
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