纯聚丙烯热法铝塑复合膜及其热封性能

目的 为了提高铝塑复合膜的热封和抗腐蚀性能，提出一种新的基于纯聚丙烯(CPP)的热法铝塑膜制备方法。方法 不同于传统的干法和热法工艺，通过在铝箔表面沉积纳米金属防腐涂层直接实现纯CPP与铝箔的黏结，解决单层纯CPP在铝箔表面不能直接淋膜热复合的技术难题。对铝箔和铝塑膜的表面形貌，以及铝塑膜热力学性能、热封性能进行研究。结果 纳米涂层工艺提高了铝箔表面粗糙度，增大了铝箔和CPP之间的接触面积。热封测试的实验结果表明纯CPP热法铝塑膜的一封热封强度超过了140 N/15 mm，在电解液浸泡后的二封热封强度仍接近于140 N/15 mm。结论 纯CPP热法铝塑膜具备良好的热封和耐电解液腐蚀性能，在动力电池领域具备应用前景。

Aluminum Plastic Composite Films Prepared by Pure Polypropylene Thermal Method and Its Thermal Sealing Properties

The work aims to prepare a novel thermal method based on pure CPP layer for preparation of aluminum plastic film to improve the thermal sealing and anti-corrosion performance of aluminum plastic film. Different from the traditional dry and thermal method, a single layer of pure polypropylene (CPP) was casted onto the aluminum foil with pre-deposited nano metal anticorrosive coating, resulting in strong bonding between CPP and aluminum. This method solved the long-standing problem of poor adhesion between pure CPP and aluminum. The surface morphology of aluminum foil and aluminum plastic film as well as the thermodynamic properties and thermal sealing properties of and aluminum plastic film were studied. The nano coating increased the surface roughness of the aluminum foil, leading to larger contact area between CPP and aluminum. The thermal sealing test results showed that the thermal sealing strength of the first sealing of pure CPP thermal method exceeded 140 N/15 mm. After soaking in electrolyte, the thermal sealing strength of the second sealing was still close to 140 N/15 mm. The aluminum plastic film produced by pure CPP thermal method exhibits good thermal sealing performance and electrolyte corrosion resistance. It is suitable for the application in power batteries.