Preparation method of perylene-3, 4, 9, 10-tetracarboxylic dianhydride grafted modified polypropylene film

Abstract

The invention discloses a preparation method of a perylene-3, 4, 9, 10-tetracarboxylic dianhydride grafted modified polypropylene film, and the method comprises the following steps: weighing a first predetermined mass fraction of perylene-3, 4, 9, 10-tetracarboxylic dianhydride, and dissolving the perylene-3, 4, 9, 10-tetracarboxylic dianhydride in a non-polar organic solvent under a continuous first stirring condition to obtain a long-term stable PPDI solution at room temperature; weighing a second predetermined mass fraction of 2-methylallylamine, and dissolving the 2-methylallylamine in the PPDI solution under a continuous second stirring condition to react to obtain a PPDI alkenylation solution; weighing the alkenylated PPDI powder, an initiator and polypropylene in a third predetermined mass fraction, and dissolving in a non-polar organic solvent; adding a predetermined amount of acetone solution into the perylene-3, 4, 9, 10-tetracarboxylic dianhydride grafted polypropylene solution under the condition of ice-water bath to separate out solid product crystals; and carrying out hot pressing on the powdery solid PP-g-PPDI to obtain a film-shaped sample so as to obtain the N-type molecular semiconductor grafted modified polypropylene film.

Description

technical field [0001] The invention relates to the technical field of energy storage dielectric materials, in particular to a preparation method of a perylene-3,4,9,10-tetracarboxylic dianhydride grafted modified polypropylene film. Background technique [0002] Polypropylene-based power capacitors are widely used in UHV DC transmission and flexible DC transmission projects. Taking converter stations as an example, capacitors account for the largest economic cost in all power equipment, and the number of single converter stations can reach tens of thousands. Taiwan, its equipment cost accounted for as high as 11%. To solve this problem, the most effective solution is to modify the existing polypropylene material and develop a special film suitable for power capacitors. In addition, the normal maximum operating temperature of polypropylene is only 60-70°C. In the operation of power capacitors, restricted by harsh working conditions and self-heating conditions, excessive loc...

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Problems solved by technology

However, in the current research on the modification of polypropylene, researchers often choose nano-inorganic substances as fillers to modify the polypropylene matrix, and due to the stress concentration caused by the rigid filler surface, this method generally leads to a decline in mechanical properties and cannot be carried out. Large-scale industrial and chemical applications; at the same time, in most modification methods, there is a problem of energy storage density, accompanied by a substantial increase in dielectric loss. Excessive dielectric loss will cause the temperature of the capacitor itself to rise, Accelerated thermal aging and increased failure rate; in addition, there is currently no effective modification method that can improve the high-temperature energy storage properties of polypropylene films

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