{"title":"PFAS free, food-grade, water and grease-resistant coating based on crosslinked shellac for molded pulp products","authors":"","doi":"10.1016/j.porgcoat.2024.108734","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, insect-based resin, i.e., shellac, was spray-coated onto molded pulp product (MPP) as a water and grease-resistant food-grade barrier coating for packaging applications. The shellac was first crosslinked by curing at 125 °C for 210 min, and DSC confirmed the formation of a thermoset material. Moreover, the Tg of shellac increased after crosslinking, showing a decrease in free volume and a reduction in molecular mobility. The shellac-coated MPP was further crosslinked and then tested for different barrier properties. FE-SEM confirmed the uniform coating of shellac over the MPP, and the crosslinking showed the removal of micro holes from the coating and increased the interfacial bonding with the MPP. The crosslinked shellac coating showed a high water barrier, as Cobb and water vapor transmission rate (WVTR) showed while providing excellent grease resistance through KIT test, mustard oil penetration, and heptane transmission rate (HTR). Further, the crosslinked shellac was also under the migration limit with all the food simulants at room and elevated temperatures, showing the safe usage of different food products at different temperatures. The coating also improved the coated MPP's tensile index and bending stiffness.</p></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5000,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Progress in Organic Coatings","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0300944024005265","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, insect-based resin, i.e., shellac, was spray-coated onto molded pulp product (MPP) as a water and grease-resistant food-grade barrier coating for packaging applications. The shellac was first crosslinked by curing at 125 °C for 210 min, and DSC confirmed the formation of a thermoset material. Moreover, the Tg of shellac increased after crosslinking, showing a decrease in free volume and a reduction in molecular mobility. The shellac-coated MPP was further crosslinked and then tested for different barrier properties. FE-SEM confirmed the uniform coating of shellac over the MPP, and the crosslinking showed the removal of micro holes from the coating and increased the interfacial bonding with the MPP. The crosslinked shellac coating showed a high water barrier, as Cobb and water vapor transmission rate (WVTR) showed while providing excellent grease resistance through KIT test, mustard oil penetration, and heptane transmission rate (HTR). Further, the crosslinked shellac was also under the migration limit with all the food simulants at room and elevated temperatures, showing the safe usage of different food products at different temperatures. The coating also improved the coated MPP's tensile index and bending stiffness.
期刊介绍:
The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as:
• Chemical, physical and technological properties of organic coatings and related materials
• Problems and methods of preparation, manufacture and application of these materials
• Performance, testing and analysis.