title: The microcapsule-type formaldehyde scavenger: the preparation and the application in urea-formaldehyde adhesives.
abstract: The limitation and regulation of formaldehyde emissions (FE) now shows great importance in wood-based materials such as plywood and particle board manufactured for building and furnishing materials. The widely used formaldehyde-based adhesives are one of the main sources of FE from the wood products. In this work, a new kind of long-term effective formaldehyde scavenger in the microcapsule form was prepared by using an intra-liquid desiccation method. The characterizations of the capsule (UC) were performed including the morphologies, the yields, the loading efficiency as well as its sustained-release of urea in aqueous conditions. The prepared UC could be integrated in urea-formaldehyde resins by simply physical blending, and the mixtures were available to be applied as the adhesives for the manufacture of plywood. The bonding strength (BS) and the FE of the bonded plywood in both short (3h) and long (12 week) period were evaluated in detail. It was found that the FE profile of the plywood behaved following a duple exponential law within 12 week. The addition of UC in the adhesive can effectively depress the FE of the plywood not only in a short period after preparation but also in a long-term period during its practical application. The slow released urea would continuously suppress the emission of toxic formaldehyde in a sustained manner without obviously deteriorating on the BS of the adhesives.
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors: Hongyun
authors: H
authors: Duan
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, PR China. Electronic address: qiuteng@mail.buct.edu.cn.
authors: Teng
authors: T
authors: Qiu
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors: Longhai
authors: L
authors: Guo
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors: Jun
authors: J
authors: Ye
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, PR China. Electronic address: lixy@mail.buct.edu.cn.
authors: Xiaoyu
authors: X
authors: Li
mesh_terms: D000269:Adhesives / Q000737:chemistry*; D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry; D005557:Formaldehyde / Q000032:analysis / Q000737:chemistry*; D014508:Urea / Q000737:chemistry*; D014934:Wood
chemical_list: D000269:Adhesives; D000393:Air Pollutants; D005557:Formaldehyde; C013517:ethyl cellulose; D014508:Urea; D002482:Cellulose
keywords: Formaldehyde scavenger; Microcapsule; Plywood; Sustained-release; Urea-formaldehyde resins