Improving fungal decay resistance of solvent and waterborne polyurethane-coated wood by free and microencapsulated thyme essential oil

IF 2.3 4区材料科学 Q2 Chemistry Journal of Coatings Technology and Research Pub Date : 2022-01-19 DOI:10.1007/s11998-021-00573-y

Seyed Mahmoud Miri Tari, Asghar Tarmian, Mohammad Azadfallah

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引用次数: 10

Abstract

Free and microencapsulated thyme essential oils (Zataria multiflora Boiss) were incorporated into solvent and waterborne polyurethane coatings separately to enhance decay resistance of the biocide free coatings. The essential oil was extracted by hydro-distillation in a Clevenger-type apparatus for 4?h. Poly (methyl methacrylate) (PMMA) microcapsules containing thyme oil as an active ingredient were prepared through solvent evaporation method with oil in water emulsion system. Fungal resistance of the coated hornbeam wood (Carpinus?betulus) against white rot fungus Coriolus versicolor CTB 863 A and brown rot fungus Coniophora?puteana BAM Ebw. 15 was tested according to European EN?113 standard before and after six-cycle accelerated aging test (ASTM D1037). The results revealed that the core-shell capsules were formed properly, and their sizes were in the range of 5–50?μ. The encapsulation efficiency determined by UV–visible spectrophotometer at λ?=?275 nm was 67%. The free essential oil was not efficient enough to improve the fungal resistance, while the microencapsulated oil enhanced the resistance even after the accelerated aging via a controlled-release mechanism as well as protected the susceptible ingredients through the shielding effect of the polymeric shell.

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游离百里香精油和微胶囊化百里香精油提高溶剂型和水性聚氨酯涂层木材的抗真菌性

将游离百里香精油和微胶囊百里香精油分别加入到溶剂型和水性聚氨酯涂料中，以提高无杀菌剂涂料的耐腐性。在clevenger型装置中，用水蒸气蒸馏法提取精油4h。以百里香油为有效成分，采用油-水乳液体系溶剂蒸发法制备了以百里香油为有效成分的聚甲基丙烯酸甲酯(PMMA)微胶囊。漆包木对白腐菌CTB 863a和褐腐菌Coniophora?puteana BAM Ebw. 15按照欧洲EN?113标准前后六循环加速老化试验(ASTM D1037)。结果表明:所制备的核-壳胶囊结构合理，粒径在5 ~ 50 μ之间;紫外可见分光光度计在λ?=?275 nm为67%。游离精油对真菌抗性的提高效果不足，而微胶囊化精油在加速老化后仍能通过控释机制增强真菌抗性，并通过聚合物外壳的屏蔽作用保护敏感成分。

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来源期刊

Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS

CiteScore

4.40

自引率

8.70%

发文量

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.