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With China Plastic Machinery
With China Plastic Machinery
Plastic formula analysis refers to the analysis of the sample formula through microspectral analysis (i.e. microscopic spectrum technology) technology, using spectrum, chromatography, mass spectrum, energy spectrum, thermal spectrum, etc. Plastic modification is the integration of basic resin, processing aids and/or functional additives, processing technology and other formulations, processing, and equipment technologies. Plastic modification covers a wide range of technical fields and involves many technical points. At present, more and more engineering and technical personnel focus too much on the selection of components, and they must talk about the formula whenever they modify plastic. Indeed, the formula is one of the important links in plastic modification. It is far from enough for R&D or production technicians to only focus on the formula.
Plastic formula analysis refers to the analysis of the sample formula through microspectral analysis (i.e. microscopic spectrum technology) technology, using spectrum, chromatography, mass spectrum, energy spectrum, thermal spectrum, etc.
Adjusting the formula is the easiest shortcut to achieve the application goals of plastic modification. However, regarding the plastic modification formula as a prescription for diagnosing and curing the defects of plastic modification technology often misleads the development and improvement of plastic modification technology. The author would like to express a few humble opinions based on his experience in the synthesis and application research of plastic modification additives for many years.
The focus of modified plastic formulas is often on the selection of processing aids and functional additives. In order to improve the performance of the base resin and meet the performance requirements and processing needs required by the application environment, the selection and compatibility of processing aids and functional additives are used to help modified plastic pass the processing barrier and achieve functionalization. Usually, various additives for plastic modification are distinguished according to the classification in Table 1.
Classification of additives for plastic modification Additive categories: specific varieties Processing aids Plasticizers, internal and external lubricants, antioxidants, heat stabilizers, crystallization promoters, coupling agents, impact modifiers, release agents, etc.
Functional additives Light stabilizers, antioxidants, antistatic agents, flame retardants, nucleating agents, fluorescent brighteners, colorants, antibacterial and mildew inhibitors, drip agents, defogging agents, foaming agents, etc.
Special functional additives Initiators, acid binding agents, crosslinking agents, curing and curing accelerators, inorganic powders, etc. "One effect, one agent" has become the basic principle of modified plastic formula design; "One agent, multiple effects" has become the goal of plastic additive variety structure development.
The two are not contradictory, but have the same goal, which is to improve the efficiency of modified plastic formulas. In order to achieve the desired effect of plastic modification, various additives are used more and more frequently. However, can the combined use of various additives definitely achieve our ideal expectations? Users are convinced that the functions of modified plastic come from a large number of additives of various types, but they ignore the fact that functional additives have mutual influences on each other. There may be expected positive effects, even superposition and synergistic effects of various positive effects, as well as side effects, and even anti-synergistic effects between each other. People have experienced the synergistic effect of the positive effect of additives from the wide application of composite antioxidant B215; in addition, people have also tasted the anti-synergistic effect from the premature failure of hindered amine weathering systems in acidic formulation components. The introduction of additives to give modified plastic specific functions may have a variety of different effects on operators, the environment, and contact objects during use, but this has not yet attracted enough attention from additive manufacturers and users. In recent years, the pressure and impact of environmental regulations such as RoHS, WEEE, and REACH on the plastic additive and modified plastic industries are enough to illustrate the problem.
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