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首页> 美国卫生研究院文献>Materials >Recyclability of PET/WPI/PE Multilayer Films by Removal of Whey Protein Isolate-Based Coatings with Enzymatic Detergents
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Recyclability of PET/WPI/PE Multilayer Films by Removal of Whey Protein Isolate-Based Coatings with Enzymatic Detergents

机译：PET / WPI / PE多层薄膜的可回收性通过使用酶促洗涤剂去除乳清蛋白分离物基涂层

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Multilayer plastic films provide a range of properties, which cannot be obtained from monolayer films but, at present, their recyclability is an open issue and should be improved. Research to date has shown the possibility of using whey protein as a layer material with the property of acting as an excellent barrier against oxygen and moisture, replacing petrochemical non-recyclable materials. The innovative approach of the present research was to achieve the recyclability of the substrate films by separating them, with a simple process compatible with industrial procedures, in order to promote recycling processes leading to obtain high value products that will beneficially impact the packaging and food industries. Hence, polyethyleneterephthalate (PET)/polyethylene (PE) multi-layer film was prepared based on PET coated with a whey protein layer, and then the previous structure was laminated with PE. Whey proteins, constituting the coating, can be degraded by enzymes so that the coating films can be washed off from the plastic substrate layer. Enzyme types, dosage, time, and temperature optima, which are compatible with procedures adopted in industrial waste recycling, were determined for a highly-efficient process. The washing of samples based on PET/whey and PET/whey/PE were efficient when performed with enzymatic detergent containing protease enzymes, as an alternative to conventional detergents used in recycling facilities. Different types of enzymatic detergents tested presented positive results in removing the protein layer from the PET substrate and from the PET/whey/PE multilayer films at room temperature. These results attested to the possibility of organizing the pre-treatment of the whey-based multilayer film by washing with different available commercial enzymatic detergents in order to separate PET and PE, thus allowing a better recycling of the two different polymers. Mechanical properties of the plastic substrate, such as stress at yield, stress and elongation at break, evaluated by tensile testing on films before and after cleaning, were are not significantly affected by washing with enzymatic detergents.
机译：多层塑料薄膜提供了一系列特性，这些特性不能从单层薄膜中获得，但是目前，其可回收性是一个悬而未决的问题，应加以改进。迄今为止的研究表明，可以使用乳清蛋白作为具有抗氧和湿气极佳屏障性能的层状材料来代替石油化学不可回收材料。本研究的创新方法是通过与工业程序兼容的简单过程，通过分离基材膜来实现其可回收性，以促进回收过程，从而导致获得高价值产品，从而对包装和食品工业产生有益影响。因此，基于涂有乳清蛋白层的PET制备聚对苯二甲酸乙二酯（PET）/聚乙烯（PE）多层膜，然后将先前的结构与PE层压。构成涂层的乳清蛋白可以被酶降解，从而可以从塑料基材层上洗去涂层膜。确定了与工业废物回收中采用的程序兼容的酶类型，剂量，时间和温度最佳值，以实现高效流程。当使用含蛋白酶的酶促洗涤剂作为回收设施中使用的常规洗涤剂的替代品时，基于PET /乳清和PET /乳清/ PE的样品洗涤非常有效。在室温下，测试的不同类型的酶促洗涤剂在从PET基质和PET /乳清/ PE多层膜中去除蛋白质层方面显示出积极的成果。这些结果证明了通过用不同的市售酶促洗涤剂洗涤以分离PET和PE来组织乳清基多层膜的预处理的可能性，从而可以更好地再循环两种不同的聚合物。通过在清洁前后对膜进行拉伸测试评估的塑料基材的机械性能，例如屈服应力，应力和断裂伸长率，不会受到酶洗涤剂的明显影响。

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