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On May 17, Zhongke Refinery's EVA (ethylene-vinyl acetate copolymer) plant produced a new product of solar photovoltaic materials for the first time, which will effectively alleviate the dependence of this product on imports and effectively promote the replacement of imports by synthetic resin products
.
In recent years, with the high-end development of the domestic photovoltaic industry, the domestic demand for EVA products, especially high-end photovoltaic materials, has increased significantly, and the import dependence has remained at a high level
.
The product can be used to make elastic packaging film, heat shrinkable film, agricultural film, food packaging film, photovoltaic cell lamination film, high-strength rupture-resistant bags, etc.
, and has a broad market prospect
.
picture
The production process of this product is faced with three major challenges: high vinyl acetate content, high melt index, and violent reaction
.
During the conversion process, the technicians of the plant kept an eye on the reaction control parameters, strictly controlled key indicators such as reaction pressure and temperature, increased the injection volume of vinyl acetate stepwise, and slowly increased the injection volume of propylene to adjust the melt index of the product and avoid causing decomposition reactions
.
The reaction control of this product is difficult, and the requirements for the operation of the extruder are also extremely high
.
In the process of production conversion, the internal and external operations of the team closely cooperated, combined with the operating experience of similar brands, always pay attention to the current of the extruder and the pressure of the die head, and quickly adjust the temperature of the cylinder water, the temperature of the pellet water and the speed of the pelletizer, so as to avoid sticking to the knife and producing sticky materials.
Block the pipeline and vibrating screen
.
The external operation strengthens the inspection of the vibrating screen and the appearance of the particles to ensure that the pelletizing effect is good
.
