EVOH-based (ethylene vinyl alcohol copolymer-based) thermoplastic vulcanized rubber with high air barrier properties and preparation method thereof
A thermoplastic vulcanizate and gas barrier technology, applied in the field of polymer materials, can solve the problems of poor fatigue durability and non-recyclable products, and achieve the effect of excellent physical and mechanical properties
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Embodiment 1
[0025] The basic composition and mass parts of the selected raw materials are as follows:
[0026]
[0027]
[0028] According to the above formula, mix the dried EVOH and bromobutyl rubber at 200°C, add glycidyl methacrylate grafted ethylene-vinyl acetate copolymer (EVA-g-GMA) and antioxidant in proportion, After mixing evenly, discharge the material and cool to room temperature; then mix it with plasticizer and vulcanizing agent at room temperature to obtain a rubber-plastic premix; first, put 1 / 2 of the rubber-plastic premix in a twin-screw extruder, set The screw temperature was 160°C, the rotation speed was 300rpm, dynamic vulcanization was performed for 8 minutes, and then the remaining rubber and plastic premix was added and dynamic vulcanization was performed for 5 minutes to obtain a halogenated butyl rubber / ethylene-vinyl alcohol copolymer thermoplastic vulcanizate. The TPV was pressed into a 2mm thick sheet according to the standard and the performance was tes...
Embodiment 2
[0032] The basic composition and mass parts of the selected raw materials are as follows:
[0033]
[0034]
[0035] According to the above formula, mix the dried EVOH with brominated polyisobutylene-p-methylstyrene rubber at 180°C, and add maleic anhydride grafted ethylene-octene copolymer (POE-g-MAH) and Antioxidant, after being mixed evenly, the material is cooled to room temperature; then mixed with plasticizer and vulcanizing agent at room temperature to obtain a rubber-plastic premix; first, 1 / 3 of the rubber-plastic premix is placed in twin-screw extrusion In the machine, set the screw temperature at 180°C, the rotation speed at 400rpm, dynamic vulcanization for 8 minutes, and then add the remaining rubber-plastic premix and dynamic vulcanization for 7 minutes. The TPV was pressed into a 2mm thick sheet according to the standard and the performance was tested. The performance is shown in Table 1.
Embodiment 3
[0039] The basic composition and mass parts of the selected raw materials are as follows:
[0040]
[0041]
[0042] According to the above formula, mix the dried EVOH and chlorobutyl rubber at 210°C, add glycidyl methacrylate grafted ethylene-vinyl acetate copolymer (EVA-g-GMA) and antioxidant in proportion, After mixing evenly, discharge the material and cool to room temperature; then mix it with plasticizer and vulcanizing agent at room temperature to obtain a rubber-plastic premix; first, put 1 / 4 of the rubber-plastic premix in a twin-screw extruder, set The screw temperature was 190°C, the rotation speed was 500rpm, dynamic vulcanization was performed for 4 minutes, and then the remaining rubber-plastic premix was added and dynamic vulcanization was performed for 8 minutes. The TPV was pressed into a 2mm thick sheet according to the standard and tested for performance. The performance is shown in Table 1.
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