Green selection of synthetic raw materials for plastic auxiliaries
The greening of the selection of synthetic raw materials for plastic auxiliaries is an important part of its source management. It requires that when selecting synthetic raw materials to aid in punishment, while ensuring that the auxiliaries have a suitable cost-effectiveness ratio, the use or no use of those with low Buddha points should be reduced. , high volatility, or raw materials containing toxic and harmful elements and compounds (such as marriage, pot, halogen and other elements and formaldehyde and other compounds), and should strive to use high Buddha point, low volatility, good compatibility with resin and Non-toxic or low-toxic raw material varieties are used to ensure that the additives are released as little as possible into the external environment during the service life of functional plastics, and even if they are released, they will not cause great harm to the environment.
For example, inorganic powder is non-toxic and harmless, and does not volatilize or decompose under normal processing and use temperatures, and has good coordination with the environment. The use of inorganic powder micro- and nano-particles as plastic impact modifiers can improve the In addition to the toughness of plastic materials, it can also improve its rigidity, hardness, heat resistance, as well as the dimensional stability and creep resistance of products to varying degrees. Compared with organic impact modifiers, it has great advantages. sex. Of course, the dispersibility of inorganic powders in the resin matrix is a problem that needs attention, and this problem can be well solved by coupling treatment. In order to meet the green requirements of additives, when selecting coupling agents, they should also meet the requirements of ecological design, pe wax 903, and should use non-toxic or low-toxic varieties with good compatibility with resins and good stability.
The Greening of the Synthesis Process of Plastic Additives
The greening of the synthetic process of plastic auxiliaries is a necessary condition for its source management and an important part of its zero emission. Its main realization methods are the greening of the synthetic technical route and the greening of the solvent.
(1) The greening of the synthetic technical route The greening of the synthetic technical route is based on the concept of atomic economy, green reaction concept and energy saving and emission reduction concept, and strives to achieve in the entire synthesis process:
① Make the reactants as much as possible converted into In order to maximize the utilization rate of the reaction materials, it is not only conducive to saving costs, improving efficiency, but also making the product properties uniform and stable:
② The by-products produced by the reaction are non-toxic or low-toxic, and can pass – The method is removed from the main product:
3. In the synthesis, the reaction process is controlled and adjusted by using a catalyst, etc., and a technical route with low energy consumption and low pollution is selected.
(2) Greening of solvents In the synthesis process of traditional plastic additives, most of them need to use organic solvents, and most organic solvents are toxic. If they escape into the air due to the volatile surface during the synthesis process, or It is discharged into the environment without treatment and recycling after the synthesis, which will inevitably cause great pollution to the environment. Therefore, it is actively advocated that the synthetic solvent of plastic additives should try to use non-toxic and green drop agents, such as water and alcohol. Etc., use less organic solvents such as three stupid types that will pose a threat to the environment and human health, so as to eliminate the possible harm caused by the solvent from the source. For some toxic solutions that must be used, attention should be paid to their recycling and harmless treatment. Many scientific and technological workers have made diligent efforts in the substitution of toxic and harmful organic synthetic solvents, and have also achieved gratifying results. These achievements mainly include the application of supercritical fluid technology, the preparation and application of ionic liquids, and the immobilization of conventional agents. Research and Application.
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