文献类型：期刊文献

英文题名：Polyurethane-coated urea using fully vegetable oil-based polyols: Design, nutrient release and degradation

作者：Feng, Guo Dong[1,3] Ma, Yan[1] Zhang, Meng[1] Jia, Pu You[1] Hu, Li Hong[1,2] Liu, Cheng Guo[1] Zhou, Yong Hong[1,2]

第一作者：冯国东;Feng, Guo Dong

通信作者：Zhou, YH[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forestry Prod, 16 Suojin 5th Village, Nanjing 210042, Jiangsu, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Nanjing 210042, Jiangsu, Peoples R China;[3]Key Lab Biomass Energy & Mat, Nanjing 210042, Jiangsu, Peoples R China

年份：2019

卷号：133

起止页码：267-275

外文期刊名：PROGRESS IN ORGANIC COATINGS

收录：;EI(收录号：20191806847224);Scopus(收录号：2-s2.0-85064738558);WOS:【SCI-EXPANDED(收录号:WOS:000475998000032)】；

基金：The authors are grateful for the financial support from the National Key R&D Program of China (Grant No. 2018YFD0600402), National Natural Science Foundation of China (Grant No. 31700503 and 31470613), Natural Science Foundation of Jiangsu Province, China (Grant BK20170160).

语种：英文

外文关键词：Polyurethane-coated urea; Vegetable oil-based polyols; Slow-released fertilizer; Degradation; Isocyanate index

摘要：Fully vegetable oil-based polyols with a low hydroxyl value and viscosity were designed and prepared using epoxidized soybean oil (ESO) and oleic acid as raw materials, which were also used to prepare polyurethane films 1-5 with different isocyanate indices. Their structures were characterized by FTIR and H-1 NMR. The GPC data indicated that the number-average molecular weight (Mn) of the polyols was 3331 and the distribution index was 1.578. The effects of the isocyanate index on the morphology, DMA, mechanical properties, water absorption, water contact angle, TGA and soil degradation of PU films were investigated. When the isocyanate index increased from 1.13 to 2.65, the glass transition temperature (T-g) and crosslinking density (nu(e)) of polyurethane increased from - 4.5 degrees C to 74.7 degrees C and from 630 mol/m(3) to 2000 mol/m(3), respectively. By 180 days, the degradation percentages of the five PU films (1-5) were 10.23%, 20.01%, 21.85%, 26.78% and 29.63%, respectively. Two coated ureas (Oil-PCUs) were successfully prepared containing 70% vegetable oil. The 80% cumulative release of Oil-PCUs-6% (isocyanate index: 1.58) took more than 70 days, indicating that the prepared Oil-PCUs have great potential for use in agriculture, forestry and grasslands.