What issues need to be considered in the selection of plastic additives
Release time:
2021-11-09
Before each plastic is processed, if the polymer is selected, the next thing to consider is what kind of additive is selected and its amount. Whether the plastic additives are selected correctly directly affects the processing, the performance and service life of the product. When selecting additives, there are generally four main issues to consider.
Before each plastic is processed, if the polymer is selected, the next thing to consider is what kind of additive is selected and its amount. Whether the plastic additives are selected correctly directly affects the processing, the performance and service life of the product. When selecting additives, there are generally four main issues to consider.
1. Compatibility of additives and polymers
The so-called compatibility refers to the additive and polymer can be well and evenly mixed together, does not produce phase separation and precipitation performance. The additives must exist in the product for a long time and stably, so as to play its due role, so the additives with good compatibility with the polymer should be selected as far as possible. There is, however, only a specific range of compatibility between the various adjuvants and a given polymer, beyond which the adjuvants precipitate.
2. Adaptability of additives to processing conditions
For example, if the polymer processing needs to be carried out at high temperature for a long time, when selecting additives, it is necessary to consider whether it can adapt to the processing conditions. If the processing temperature of polypropylene is relatively high, it should be selected at this temperature does not decompose, non-volatile or less volatile stabilizers; select high temperature does not decompose colorants. The same polymer, due to the use of different processing methods, the required additives are not the same.
3. Give full play to the synergy of help
A plastic often uses a variety of additives, these additives are in a system, often interact with each other, if properly matched, when used with a synergistic effect, known as "synergy". For example, when the ultraviolet absorber 2-hydroxy -4-octyl oxybenzophenone is mixed with the antioxidant tridecyl phenyl phosphite, it has a significant synergistic effect. On the other hand, if the selection is improper, when used to produce a reduction effect, it is called. The role of confrontation ". Such as carbon black and amine antioxidants and used in polyethylene, it will produce a confrontation, each other to weaken the original stabilization effect.
4. The use of the product on the auxiliary constraints.
The choice of plastic additives is often limited by the use of products, such as plastic products always contact with people, especially those food packaging and blood transfusion materials, etc., more closely related to human health, so we must choose non-toxic provenances: for products that are often in contact with oil or water. Additives that are not easily extracted by oil or water must be selected.
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