How to select the antioxidant component in the masterbatch for gas pipes?
Publish Time: 2024-12-11
In the formulation design of the masterbatch for gas pipes, the selection of antioxidant components is a crucial link, which is directly related to the stability and safety of the gas pipe during long-term use.
First of all, considering that the gas pipe serves for a long time in the gas environment, the antioxidant needs to have high-efficiency antioxidant properties. The main antioxidant usually selects hindered phenol compounds, which can effectively capture the free radicals generated during the oxidation process of the material, thereby interrupting the chain oxidation reaction. For example, the common antioxidant 1010, the multiple hindered phenolic hydroxyl groups in its molecular structure can provide strong free radical capture ability and inhibit the degradation of the polymer molecular chain.
However, a single main antioxidant is often difficult to meet the requirements of complex use environments, so auxiliary antioxidants are needed to work synergistically. Auxiliary antioxidants are mostly phosphite compounds, such as antioxidant 168. Its main function is to decompose hydroperoxides, which are intermediate products in the oxidation reaction. If not decomposed in time, it will further trigger a more violent oxidation reaction. The main antioxidant and the auxiliary antioxidant cooperate with each other to form a complete antioxidant system, which greatly enhances the antioxidant effect of masterbatch.
The addition ratio of antioxidants is also extremely critical. If the addition amount is too small, the antioxidant effect cannot be fully exerted, and the gas pipe is prone to aging, brittleness and other problems in a short time; and if the addition amount is too large, it will not only increase the cost, but also may affect other properties of masterbatch, such as processing performance and mechanical properties. It is necessary to accurately determine the optimal addition ratio of antioxidants through a large number of experiments and simulation calculations based on factors such as the specific use conditions, expected life and characteristics of the base resin of the gas pipe.
In addition, the compatibility of antioxidants with other components in masterbatch must also be considered. If the compatibility is poor, the antioxidant may migrate and precipitate in the masterbatch, resulting in uneven local antioxidant performance and affecting the quality of the entire gas pipe. Therefore, when selecting antioxidants, it is necessary to conduct in-depth research on the interaction between them and other additives such as flame retardants and light stabilizers and base resins to ensure that they can coexist harmoniously and jointly protect the performance of the gas pipe. Only by comprehensively considering the above factors can we scientifically and rationally select the antioxidant components in the masterbatch dedicated to gas pipes, so that the gas pipes can operate reliably in the harsh gas transportation environment and ensure the safety and stability of the gas supply system.
