In the waste plastics market, the ingredients of the additives are essential. Because the finished additive can not only play a neutral and efficient role, but also increase the value of waste plastic
components to achieve the purpose of comprehensive utilization, then how to properly control such additives?
First, the role of additives
During the use of waste plastic products, due to the influence of external conditions and the action of light and heat, there have been different degrees of aging, and various additives contained therein have different degrees of loss, such as recycled waste soft PVC. The loss of plasticizer is large, and it is used to produce recycled products, and its performance is far worse than that of products made with new materials. In order to improve the quality of recycled products as much as possible, it is necessary to re-add a certain amount of additives in the process of remanufacturing to improve the molding processing, mechanical and thermal power generation of waste plastics.
1. Selection of additive types
The choice of additives is determined by the type of plastic and the degree of aging.
In the processing of polyolefin new materials, only a small amount of additives, such as antioxidants, ultraviolet absorbers, etc., are generally added. When the waste is recycled, it is generally only necessary to add a small amount of coloring agent, so the formulation is not difficult to determine. Unless such plastics are severely aged, hard and brittle, the composition of the ingredients needs to be determined on a case-by-case basis.
The composition of PVC plastics is relatively responsible, especially soft polyvinyl chloride, which contains many kinds of additives, such as plasticizers, stabilizers, UV absorbers, lubricants and pigments, among which plasticizers are the main ones. , the most used. The products are affected by climatic conditions such as light and heat during use. The plasticizer gradually oozes out, and the product hardens, especially its physical properties are greatly reduced, gradually aging, and can not meet the requirements of use and become waste. When recycling such waste products, a sufficient amount of plasticizers and other auxiliaries must be added to maximize the recovery of mechanical properties, because it is important to determine the formulation reasonably.
The amount of plasticizer added is mainly determined by the hardness required for the recycled polyvinyl chloride product. For this reason, the ratio of hard and soft in the recycled polyvinyl chloride waste product should be considered. The amount of plasticizer in soft products such as PVC film, artificial leather and wallpaper is very different from that in rigid pipes and profiles. Therefore, as long as the hard and soft recovery rates are mixed with each other, adjustment is made. By blending the two, it is possible to produce a recycled product of the required hardness, which can reduce the amount of plasticizer, even without plasticizer.
Second, the principle of using additives
The general principle of selecting additives in the batching process is to ensure that the recycled products have certain performance, meet the requirements of use, and are not too expensive. In general, consider the following points:
(1) Because the price of waste plastics and recycled products is lower, the additives used are also cheaper.
(2) Just because waste plastics are often a mixture of various color wastes, dark colorants are generally added during reprocessing, so the appearance and color of the selected additives are not high.
(3) The additive should meet the certain performance requirements of the recycled product.
In general, waste plastic additives should control a certain amount, and should also take into account the plastic composition, which requires us to fully understand the knowledge of waste plastics, in the future demand, can be better utilized.
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