Selection Of Lubricants In PVC Formula Adjustment

Selection of lubricants in PVC formula adjustment, there are many types of lubricants, and each specific product has specific characteristics. Being familiar with the performance advantages and disadvantages of each specific lubricant product and how to use it is conducive to designing a better formula.

1. Molecular structure of lubricants:

Understanding the molecular structure of the lubricant used, including functional groups, chain lengths, single and double bonds, branched chains, isomerization, etc., helps to make a preliminary judgment on the performance of the lubricant.

However, in chemistry, the same type of substance may have a world of difference in performance if there are slight differences in structure. For example: the performance and function of the cis and trans chemical structures of substances with the same molecular structure are sometimes very different. Therefore, when examining a lubricant, the molecular structure can only be a preliminary judgment of performance, and it cannot be too hasty and arbitrary.

2. Polarity of lubricants:

PVC is a polar material. Whether the lubricant is a polar or non-polar substance can be roughly defined as internal lubrication or external lubrication.

In terms of polarity, the words “similar” or “close” must be grasped. If the polar materials are the same, but the polarity is very different from that of PVC, they will not be well soluble.

3. Heat resistance of lubricants:

The heat resistance of lubricants refers to the ability of lubricants to resist thermal decomposition or changes in the properties of heated materials. The use environment of lubricants is in high-temperature materials, machine screws, barrels, and molds. If the lubricant has been thermally decomposed or the material properties have changed at the use temperature, it will not be able to play a lubricating role. At the same time, the residual decomposition of thermal decomposition will also affect the performance and appearance of PVC products. We often see defects such as die head coke and wire drawing on the surface of products, which are often greatly related to the lack of heat resistance and decomposition of lubricants.

Tianshi PVC products use polyethylene wax, batch rheological properties are stable, delayed plasticization, and late lubricity and heat resistance are good.

Product advantages of polyethylene wax for PVC products:

1. High softening point, low viscosity, large molecular weight, and small heat loss.

2. It has a strong external lubrication effect. Compared with ordinary conventional polyethylene wax, it can delay plasticization and reduce torque.

3. It is easy to disperse and improve the gloss of the product.
4. Good compatibility and anti-precipitation.

5. Good demoulding performance, good metal peeling performance, and long continuous production time.

6. Good thermal stability in the later stage, does not contain oligomers, paraffin, etc. No precipitation, no migration.

7. Environmental protection, passed ROHS and heavy metal detection.

Application areas of polyethylene wax for PVC products:

1. PVC wood plastic industry

2. PVC wide foam board industry

3. PVC large diameter pipes and profiles industry

4. PVC threading pipe industry

5. PVC cable material industry.