Preparation method of novel PETG thermal contraction label film special for battery

Abstract

The invention discloses a preparation method of a novel PETG thermal contraction label film special for a battery, comprising the following steps: preparing and mixing the selected raw materials of the PETG, the PET, the recycled granules with the proportion of 55-60%:25-30%:20-10%; and performing extrusion molding, cooling the melt into casting pieces, longitudinally stretching, measuring the thickness of the cutting edge, winding and the like to obtain the finished products. The method of the invention enhances the initial thermal contraction temperature of the battery thermal contraction label, ensures the good service condition of the battery in the environment with higher temperature, and reduces the waste during the transportation and the preservation processes. The contraction force can not be lost by the heat generated during the charging and discharging processes of a secondary battery, thereby enhancing the use ratio of the battery. The PETG thermal contraction label film of the invention can be used to replace the PVC contraction film, which has good performance and can reduce the environmental pollution generated in the manufacturing and processing of the PVC material.

Description

technical field [0001] The invention relates to a production method of a novel PETG heat-shrinkable battery special label film. Background technique [0002] The so-called battery-specific label film refers to a label film that has a high temperature when it starts to shrink, and the shrinkage force decreases significantly after shrink packaging, which improves the surface smoothness and anti-corrosion performance of the package. The battery label film was originally made of PVC (polyvinyl chloride). Although the temperature resistance can be modified by additives to meet the requirements, due to the production of chlorine monomers during PVC processing and waste film treatment, it is harmful to the environment and people. There are certain hazards to health, so the use of PVC to make various packaging materials has been banned in Europe, the United States, and Japan. Instead, PET materials, an environmentally friendly material that can be recycled and incinerated, are used ...

AI Technical Summary

Problems solved by technology

The battery label film was originally made of PVC (polyvinyl chloride). Although the temperature resistance can be modified by additives to meet the requirements, due to the production of chlorine monomers during PVC processing and waste film treatment, it is harmful to the environment and people. There are certain hazards to health, so the use of PVC to make various packaging materials has been banned in Europe, the United States, and Japan. Instead, PET materials, an environmentally friendly material that can be recycled and incinerated, are used for heat shrinkage of batteries The label film is developed under this situation. The general PETG heat shrinkable film has poor temperature resistance and basically starts to shrink at 50-55°C. If it is stored at this temperature for a long time after packaging, the shrinkage force will be obvious. When the ambient temperature of the battery returns to normal, due to the decrease of the shrinkage force, the surface is uneven, and water can enter between the battery case and the label film, causing the case to corrode

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