Selection of the most popular plastic additives

2022-07-28
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Selection method of plastic additive types

the selection of additive types is determined according to the engine type and aging degree of the mechanical and electrical control components of plastic products

only a small amount of additives, such as antioxidants and ultraviolet absorbers, are generally added to polyolefin new materials during processing and molding. Generally, only a small amount of colorants are added to the waste recycling, so the formula is not difficult to determine. Unless this kind of plastic is recommended to be equipped with servo system ball screw, which can fully meet the user's requirements. If the material is seriously aged, hard and brittle, the composition of the ingredients needs to be determined according to the specific situation

the composition of PVC plastics is relatively complex, especially soft PVC. It contains many kinds of additives, including plasticizers, stabilizers, UV absorbers, lubricants and pigments, of which plasticizers are the main ones with the largest amount. The products are affected by light, heat and other climatic conditions in the process of use. The plasticizer gradually exudes, and the products harden. In particular, their physical properties are greatly reduced and gradually aging. They cannot meet the use requirements and become waste products. When using this kind of waste products for regeneration, it is necessary to supplement a sufficient amount of plasticizers and other additives to maximize the recovery of their mechanical properties. Therefore, it is very important to reasonably determine the formula

the amount of plasticizer is mainly determined by the required hardness of Recycled PVC products. Therefore, the proportion of hard and soft in Recycled PVC waste products should be considered. Dust is often adsorbed on the surface of PVC film and artificial parts. The residual amount of plasticizer in soft products such as leather and wallpaper is very different from that in products such as hard pipes and profiles. 1 Polyethylene: tensile strength and elongation at break. Therefore, as long as the hard and soft recycled materials are mixed with each other and the mixing ratio of the two is adjusted, the recycled products with required hardness can be prepared, which can reduce the amount of plasticizer or even do not use plasticizer

the general principle of selecting additives in batching is to ensure that the recycled products have certain performance, meet the use requirements, and do not cause the cost to be too high. Generally speaking, the following points need to be considered:

(1) as the price of waste plastics and recycled products is low, the price of additives used is also cheap

(2) because waste plastics are often a mixture of waste materials of various colors, dark colorants are usually added during regeneration processing, so the appearance color requirements of the selected additives are not high

(3) additives shall meet certain performance requirements of recycled products

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