文献类型：期刊文献

英文题名：Crack-resistant melamine/formaldehyde-impregnated paper-decorated panels using blocked isocyanates as a temperature-responsive crosslinker

作者：Feng, Yun[1] Qu, Wei[1,2] Wu, Yuzhang[1] Zhang, Jingpeng[1] Peng, Limin[2]

通信作者：Qu, W[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry New Technol, Xiangshan Rd, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Xiangshan Rd, Beijing 100091, Peoples R China

年份：2022

卷号：173

外文期刊名：PROGRESS IN ORGANIC COATINGS

收录：;EI(收录号：20223912810466);Scopus(收录号：2-s2.0-85138472649);WOS:【SCI-EXPANDED(收录号:WOS:000872387500001)】；

基金：This research was supported by the "Fundamental Research Funds of Research Institute of Forest New Technology, CAF (no. CAFYBB2020SY033)".

语种：英文

外文关键词：Temperature -responsive crosslinker; Melamine -formaldehyde resin; Impregnated paper; Blockboard; Toughness; Cracking resistance

摘要：Melamine-formaldehyde (MF) resin-impregnated paper-decorated panels are prone to surface cracking, which can be reduced by changing the brittle structure of the MF resin. To increase the curing degree and toughness of the resin, a hexamethylene diisocyanate trimer blocked with methyl ethyl ketoxime (ME-HDI-tri) was used as a temperature-responsive crosslinker. This latent crosslinking agent only worked above 120 degrees C, which prevented it from participating in cross-linking reactions during the preparation of the impregnated paper. The chemical structures of the modified MF resins (ME-HDI-tri-MF) were characterized by Fourier-transform infrared (FTIR) spectroscopy. The curing behaviors of the MF resins were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical thermal analysis (DMTA). Impregnated paper was prepared with ME-HDI-tri-MF, and its tensile strength and elongation at break were tested. Blockboard was prepared with ME-HDI-tri-MF, and its cracking and corrosion resistance were tested. The absorption peak of the methylene chain was observed in the FTIR spectrum of ME-HDI-tri-MF after curing, which indicated that ME-HDI-tri participated in the curing reaction of the MF resin. With the addition of ME-HDI-tri 5 %, the curing temperature of the MF resin decreased from 142 degrees C to 130 degrees C, and the ultimate tensile stress and elongation at break of the modified impregnated paper increased by 97.70 % and 86.25 %, respectively. The cracking and corrosion resistance of the decorated panel prepared with ME-HDI-tri-MF were also improved. After adding 3 % ME-HDI-tri, the surface cracking of the decorated panels was prevented, which extended the service life and broadened the application range of the decorated panels.