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The cable will also "oil out"

Author：Shenghua Cable Click： Time：2020-01-13 00:00:00

A while ago, I saw news online about the phenomenon of "oil leakage" on the surface of PVC sheaths during use. The "oil" here actually refers to some incompatible substances in PVC gradually transferring to the surface during use, forming a mixture similar to oil.

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PVC is what we often refer to as PVC insulated cables. Why does PVC experience oil leakage? This will depend on the raw materials used in PVC.

The main material used in PVC is PVC resin. In the performance of PVC resin, the absorption and particle size of plasticizers directly affect the compatibility between the resin and plasticizers.

The different synthesis methods of PVC resin have a significant impact on the surface characteristics, porosity, and molecular weight distribution of resin particles, as well as the compatibility with plasticizers. When the compatibility is poor, during the use of the cable, plasticizers will migrate out from the gaps between PVC macromolecules, and the surface of the cable will have plasticizer precipitation, forming a phenomenon of "oil leakage".

So why do plasticizers need to be added to PVC sheaths? The main function of plasticizers is to reduce the intermolecular forces, making their materials more plastic and more convenient and flexible in the production process.

Considering the poor compatibility between resins and plasticizers, in order to avoid such "oil leakage" accidents, manufacturers need to consider two aspects when selecting plasticizers:

1. There is a parameter value to determine the compatibility between plasticizers and PVC: dissolution parameter. The closer the dissolution parameter is to 9.6, the better the compatibility between the two.

2. The type and concentration of plasticizers can be controlled, and these factors can have a significant impact on compatibility.

3. In order to improve compatibility, a stabilizer can also be added, which can promote the oxidation of plasticizers. However, the amount of stabilizer also needs to be controlled, not too large. Improper selection or high content of stabilizers can also cause oil discharge from cable materials.

4. During storage, if PVC is affected by temperature, humidity, and other factors, oil may also occur. Plasticizers with poor compatibility will slowly precipitate in high-temperature environments, while in environments with high humidity, plasticizers absorb moisture from the air and slowly hydrolyze, resulting in precipitation.

In addition, improper operations and dosage in processing aids, processing techniques, kneading temperature and speed, granulation process, and extrusion process can all cause varying degrees of oil leakage.

So, an excellent and qualified cable requires optimization in materials, manufacturing processes, testing, transportation, storage, and other aspects to ensure that the cable delivered to customers is of excellent quality. Shenghua Cable attaches great importance to quality and production control, strictly optimizes production procedures, and strives for perfection. This is also an important reason why Shenghua Cable is popular in the market.

Shenghua Cable Group mainly produces high and low voltage cross-linked cables, power cables (YJV, YJV22, YJLV), distribution wires (BV, BVR, RVV, RVS), aluminum alloy cables (YJLHV), overhead cables, flame-retardant and fire-resistant cables, rubber sheathed cables, control cables (KVV), special cables, and other products.

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The cable will also "oil out"

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