Reasons for thermal weight loss of PVC cable material

The reason for the thermal weight loss of PVC cable material (GB/T8815 standard name is "Economic loss of quality management after aging"):

The present invention mainly uses PVC resin as the main material, and its performance research determines the service life of the cable material network. Due to the presence of tertiary chlorine in PVC, the molecular structure is different and the polarity is strong. Under conditions such as light, heat, and oxygen, enterprises are prone to degradation due to the loss of CL, and the electrical and mechanical system properties of the alloy rapidly decline, resulting in brittleness and elastic loss, ultimately losing its plastic function. This process is commonly referred to as "aging".

In PVC, the main plasticizers that support cable materials to have a certain degree of elasticity in China are generally different plasticizers. Under conditions such as light, heat, and oxygen, plasticizers gradually develop and start to evaporate or decompose due to oxidation, which can directly cause the PVC cable material to become brittle, leading to a continuous decline in performance research and loss of the original performance analysis and design technical requirements. The Thermo Gravimetric analysis and testing method simulates the size of the volatile plastic properties between polyvinyl chloride resin and plasticizers under working conditions, as well as the advantages and disadvantages of cables. The larger the heating effect, the shorter the lifespan of the network under the same economic conditions, and the easier it is to age, and vice versa.

Generally, in order to improve aging performance, plasticizers, stabilizers, and low volatility antioxidants are added to inhibit the degradation of polyvinyl chloride under photothermal oxygen conditions, reducing the oxidation and volatilization of plasticizers.