Manufacture of Inhibited Films by Hose Extrusion

Extrusion by pol3Tner hose blowing may produce both single-layer and multilayered inhibited films. It is highly productive, quiet simple and facilitates regulation of dimensions, structure, physical-mechanical and other characteristics of the film materials within a wide range. 

Modifications of the method for the single-layer inhibited films are illustrated in Fig. 2.5 [3,59]. 

One of the difficulties in realizing this technique is how to preserve the initial properties of the Cl as it is processed jointly with the polymer melt. If one compares the extrusion temperatures of PE (120-250°C) and Tdi of VCI (Table 2.4), it becomes evident that their joint extrusion may result in the loss of the volatile fractions and impairment of the inhibiting property of Cl. Therefore, the problem of finding heat-resistant VCI comes to the forefront. These properties are intrinsic to novel Cl of the PHC series [5,6,62]. Besides, this problem can be solved by impregnation of matter that is relatively resistant to temperature and has a low volatility, such as monoamines and organic or inorganic acids that form VCI during interactions at extrusion [44]. 

The anticorrosion characteristics of inhibited films depend strongly on Cl liberation kinetics. During joint extrusion the Cl become encapsulated in 

Russian Trade Name Tdi, °C Russian Trade Name Tdi, °C 

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