Preparation of urea-formaldehyde@epoxy resin microcapsule and its effect on waterborne wood coatings
YAN Xiaoxing;CAI Yunting;GUO Weijuan;YANG Rue;QIAN Xingyu;PAN Ping;XU Wei;Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University;College of Furnishings and Industrial Design,Nanjing Forestry University;Guangdong Yihua Timber Industry Co.Ltd.;
The global waterborne coating market is extensive,and it is forecasted the strong rise of this market in product section and every country in the future. In addition,the domestic furniture market is placing increasingly higher requirements on the quality of furniture appearance. To meet the expanding international and domestic furniture market demands,it is necessary to develop effective technologies for improving the performance of waterborne wood coatings. This study is aimed at developing a newtechnology,i.e.,urea-formaldehyde@ epoxy resin microcapsule,to enhance the performance of waterborne wood coatings. Lab-made microcapsules were applied to prepare waterborne coatings. When cracks occur in the coating film,the microcapsules would fracture and release the repairing agent therein,so that the repair coating can extend the service life of the paint film. In this paper,the urea-formaldehyde resin@ epoxy resin microcapsules were prepared by the two-step in-situ polymerization method. The capsule wall was made of urea and formaldehyde,and the capsule-core was prepared by epoxy resin. The microcapsule was added to the wood waterborne coating to form wood coating,and the effect of the microcapsule on the performance of waterborne coatings and the self-repairing capability was explored. The morphology and chemical composition of microcapsule were characterized by the scanning electron microscope(SEM) and infrared spectroscopy(IR). The gloss,hardness,adhesion and impact resistance of the coating were evaluated by adding the microcapsules with different concentrations. The results showed that,when the content of microcapsule was 10% and the mass ratio of core wall material was 0.83 ∶1,the whole waterborne coating had good physical properties in the waterborne coating and had little negative effect on each property of the coating. The scratch test was used to initially explore the self-healing ability of the microcapsules on the waterborne coating,and the self-healing coating with a verified content of 10% had a good repairing capability. In this study,the preparation and performance characterization of waterborne self-healing coatingswere investigated to explore the possibility of using microcapsules self-healing technology in waterborne coatings. The pioneering research in the field of self-repairing waterborne coatings can provide the foundation for extending the applications of the waterborne wood coatings.
【Fund】： 江苏省自然科学基金青年基金(BK20150887);; 江苏省高校自然科学研究项目(14KJB220007)
【CateGory Index】： TQ637
【CateGory Index】： TQ637