Several Matters Needing Attention In The Use Of Epoxidized Soybean Oil Additives
Plastic additives are becoming more and more important in the current industrial production. Plastic additives need to pay attention to some problems when they are used. Otherwise, some defective products will appear in the manufacture of plastic products. Let's take a closer look at the plastic additives in use. Several things to note
1. Compatibility of plastic additives with polymers
If the compatibility is not good, the plastic additives are easy to precipitate. The precipitation of solid plastic additives, commonly known as "blooming"; the precipitation of liquid plastic additives, called "exudation" or "sweating." After the plastic additives are precipitated, the plastic additives are lost and the appearance of the plastic products is affected. However, it should also be noted that for certain plastic auxiliaries, it is not required to have good compatibility with polymers. For example, the compatibility of the lubricant should not be too large, otherwise it will act as a plasticizer to soften the polymer.
The compatibility of plastic auxiliaries with polymers depends primarily on their structural similarities. For example, a more polar plasticizer is more compatible in polar polyvinyl chloride than a weaker one. As another example, the introduction of longer chain alkyl groups in antioxidants and light stabilizers improves their compatibility with polyolefins.
For inorganic fillers and inorganic pigments, they are insoluble in the polymer, but are dispersed heterogeneously in the polymer. For this type of plastic auxiliaries, their dispersibility is required, and the fineness is as small as possible.
2. Interaction between plastic additives and polymers in terms of stability
Plastic additives must be stably present in plastic products for a long time. Therefore, attention should be paid to the interaction between the plastic additive and the polymer in terms of stability. Some polymers (such as polyvinyl chloride) decomposition products are acid and alkaline, can decompose some plastic additives; there are also some plastic additives can accelerate the degradation of polymers.
3. Durability of plastic additives
The loss of plastic additives is mainly through three routes: volatilization, extraction and migration. The amount of volatility depends on the structure of the plastic auxiliaries. For example, since the molecular weight of butyl phthalate is less than that of dioctyl phthalate, the former is much more volatile than the latter. The extraction of plastic additives is directly related to its solubility in different media. The appropriate plastic additives should be selected according to the environment in which the products are used. Mobility refers to the transfer of plastic auxiliaries from an article to an adjacent article, the likelihood of which is related to the solubility of the plastic auxiliaries in the different polymers.
4. Adaptability of plastic additives to processing conditions
The processing conditions for the plastic additives are mainly heat resistance, that is, the plastic additives are required to not decompose, not easily volatilize and sublimate at the processing temperature. At the same time, attention should be paid to the corrosive effects of plastic additives on processing equipment and molds. Different polymer processing conditions are different; the same polymer, due to different processing methods, the required plastic additives may also be different. In short, the selected plastic additives should have applicability to the processing conditions.
5. Relationship between product use and selection of plastic additives
The important basis for the selection of plastic additives is the end use of the product. Products with different uses have certain requirements on the appearance, odor, durability, pollution, electrical properties, thermal properties, weather resistance and toxicity of the plastic additives used.
The toxicity of plastic additives has long been a cause of concern. In particular, the health and safety of plastic products such as food and pharmaceutical packaging materials, medical devices, water pipes and toys has received increasing attention. The plastic auxiliaries used in the above plastic products are strictly regulated by the countries.
6. Synergism and phase interaction of plastic additives
A variety of plastic auxiliaries in the same polymer, such as appropriate blending, plastic auxiliaries often synergistically, one of the main purposes of the "synergy" polymer formulation research is to find synergy between plastic auxiliaries effect. Of course, simplifying components, reducing costs, etc. are also the purpose of formulation research. If the formula is not properly selected, it may cause a "phase reaction" between the plastic additives, so it should be avoided as much as possible. Chemical changes and discoloration between different plastic additives should also be avoided.
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