The relationship between PVC pipe extrusion color difference and stabilizer

After the stabilizer of rigid PVC products is changed from lead salt to environmental protection stabilizer such as calcium and zinc, the color problem is also a relatively common problem with various forms, and it is relatively difficult to solve. Its manifestations are as follows:

1. Stabilizer replacement leads to changes in product hue. After the stabilizer is changed from lead salt to calcium and zinc, it is easy to find that the hue of the product is often cyan, and it is difficult to realize the hue from cyan to red.

2. The color inside and outside of the product is inconsistent after using the environmentally friendly stabilizer. Usually, the outer color is relatively positive, and the inner part is easy to be green and yellow. This situation is easy to occur in profiles, and it also occurs in pipes.

3. The color drift of the product during processing after using the environmental stabilizer. In the process of using lead salt stabilizer to process products, there will be a certain hue deviation between each machine and the same machine at different time periods, but the fluctuation range is relatively small. With the use of environmentally friendly stabilizers, this fluctuation may become larger, and the effect of small fluctuations in raw materials and processes on hue may be more obvious. I have encountered the situation that when using environmentally friendly stabilizers to produce pipe fittings, the pressure change not only affects the hue of the product, but also affects the performance of the product. This change is much more sensitive than when lead salt stabilizer is used.

4. The color problem of the product during storage, transportation and use after using the environmentally friendly stabilizer. Rigid PVC products using traditional lead salt stabilizers have little color change during storage, transportation and use. After being converted to environmental stabilizers such as calcium and zinc, it may appear yellowish and greenish after standing. When some stabilizers are used in products with high iron ion content in calcium powder, the problem of product redness may occur.

The main reason for the color problem is that the material components of the environmental stabilizer are relatively complex. The thermal stability in the early, middle and late stages is achieved through the coordination of various materials. Each component has a certain influence on the hue of the product. a possibility.

Jiangsu Xinrongplas Machinery Co.,Ltd focus on manufacturing various plastic pipe extrusion machine such as PPR pipe extrusion machine, PVC pipe extrusion machine, PE pipe extrusion machine etc, welcome to consult.