When PVC materials are processed, some PVC processing aids are usually used, which can help us to process better, but if we want to have good results, we still need to use them correctly. At this time, we will There are some precautions that we need to pay attention to and understand, so as to use it reasonably.
1. Compatibility between auxiliaries and resins. Generally speaking, only if the auxiliaries have good compatibility with the resins can the auxiliaries exist in the product for a long time, stably and uniformly, and effectively exert their functions. If the compatibility is not good, the phenomenon of "sweat" or "blooming" is easy to occur, but sometimes the compatibility is not good, and the product requirements are not too strict, and there can still be poor compatibility, such as fillers and trees. The compatibility between waxes is poor, as long as the particle size of the filler is small, it can still basically meet the performance requirements of the product, and the thread can be treated with a coupling agent or surfactant as much as possible to fully release its function.
2. Durability of additives: PVCJ processing additives are sometimes volatilized and reduced. The additives are mainly volatilized in three ways. The extraction and migration are mainly related to the molecular weight of the additives, the solubility in the medium and the infertility in the resin. .
3. The adaptability of PVC additives to processing conditions: the processing conditions of some resins are harsh. If the processing temperature is high, it should be considered whether the selected additives will decompose and whether the additives have corrosive effects on molds and equipment.
4. Restrictions on additives by product use: Products with different uses have certain requirements on the odor, toxicity, electrical properties, shochu and thermal properties of additives.
5. Synergy and relative resistance in the combination of additives. In the same resin system, sometimes two of the additives will have a "synergistic effect", which is much more effective than using a single additive alone. However, if the combination is improper, the "antagonism" between the two additives will weaken the function of each additive, or even make a certain additive ineffective. Special attention should be paid to this point, such as carbon black and amine or phenolic oxygen disruptors. When used together, there will be a confrontational effect.
The above are the precautions when using PVC processing aids. According to the attention, it is the project, which helps us to use the product reasonably, and effectively prevents the loss of the enterprise and the improper use due to the failure of the product.