Achieving Dual-Functionality by Surface Coating of Zeolite with Stearic Acid: Combining Breathability and Odor Control P
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Article www.springer.com/13233 pISSN 1598-5032 eISSN 2092-7673
Achieving Dual-Functionality by Surface Coating of Zeolite with Stearic Acid: Combining Breathability and Odor Control Properties in Polyethylene/Zeolite Composite Films Celal Söylemez1 İlker Türkmen1 İlhan Özen*,2
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Lidersan Sağlık ve Gıda Ürünleri A.Ş., 4. Organize Sanayi Bölgesi 83409, Nolu Cd No:8, 27630 Şehitkamil Gaziantep, Turkey 2 Department of Textile Engineering, Erciyes University, 38039, Melikgazi Kayseri, Turkey Received June 3, 2020 / Revised August 7, 2020 / Accepted August 17, 2020
Abstract: This study was aimed at providing both water vapor permeability and hydrogen sulfide adsorption properties in polyethylene (PE) stretched films by using different amounts of natural zeolites. Firstly, zeolite was coated with 1%, 5%, and 7% stearic acid in a high shear mixer. Cup test, Fourier transform infrared (FTIR) spectroscopy, and ash-oven analyses showed that a succesful coating was achieved. According to the Brunauer, Emmett and Teller (BET) gas adsorption and inductively coupled plasma mass spectrometer (ICP-MS) analyses, surface treatment with stearic acid didn’t change the particle size of the zeolite but lowered its hydrogen sulfide (H2S) adsorption capacity from 38.84±5.22 ppm/g sample (uncoated zeolite) to 17.26±2.54 ppm/g sample (7% coated zeolite). PE/zeolite (80/20 and 60/40 w/w) blown films were generated by using uncoated and 1%, 5%, and 7% stearic acid coated zeolites and then stretched. It was observed that the stearic acid coating of zeolite greatly improved the compatibility between polyethylene and zeolite resulting in films without pinholes generation after stretching (especially the 7% coated zeolite containing PE/zeolite (60/40 w/w) film). The usage of coated zeolite also improved mechanical properties by increasing the tensile strength and decreasing the elongation at break values. It was revealed that a loading amount of 40 wt% coated zeolite was necessary for achieving a sufficient breathability (658±4 and 1040±3 g/m2/day for 5% and 7% coated zeolite containing films, respectively). Odor removal capacity of the PE/zeolite (60/40 w/w) films was improved by 165% and 244% for the 5% and 7% coated zeolite containing samples, respectively. Keywords: polyethylene, zeolite, stearic acid, surface treatment, hydrogen sulfide, breathable film.
1. Introduction Nowadays, comfort together with added functional properties are highly desired from textiles due to the increased consumer awareness and demands.1-4 In this sense, there are lots of studies for the purpose of furnishing healthcare/hygienic textile products with odor control property in recent years, while maintaining their breathability property. In the field of healthcare/hygienic textile products including baby and adult incontinence diapers and sanitary napkins,5-8 breathable films play an important role in providing comfort. Breathable films are produced by using polyolefinic polymers and stearic acid coated calcium carbonate (CaCO3) fillers. After stretching the film
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