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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Biobased, Nonisocyanate, 2K Polyurethane Coatings Produced from Polycarbamate and Dialdehyde Cross-linking
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Biobased, Nonisocyanate, 2K Polyurethane Coatings Produced from Polycarbamate and Dialdehyde Cross-linking

机译：生物化，非异氰酸酯，由聚氨基甲酸酯和二醛交联产生的2K聚氨酯涂料

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摘要

Bioderived polycarbamates were cross-linked with petrochemically derived and biomass-derived dialdehydes to form nonisocyanate polyurethanes (NIPUs). The bioderived polycarbamates were synthesized from a soybean oilderived alkyd polyol and epoxidized sucrose soyate polyol via transcarbamoylation. The polycarbamates were cross-linked with 1,4-cyclohexanedicarboxaldehyde and 2,5- diformylfuran (DFF) to form coatings under either laboratory ambient conditions or through an elevated temperature cure. The coatings were characterized spectroscopically, thermally, and via standard ASTM-coating characterizations. The coatings cured under ambient conditions had similar properties to those subjected to the elevated temperature cure. Ambient-cured coatings exhibited fast tack-free times, Tg values from 67 to 96 °C, high hardness, and good solvent resistance; however, they were brittle and had poor adhesion on aluminum substrates. Coatings cured at elevated temperatures showed increases in Tg values to 75-150 °C. Coatings on pretreated steel substrates had good adhesion. This study demonstrates the potential for bioderived DFF to function as a dialdehyde cross-linker to form NIPUs with bioderived carbamate functional resins resulting in a bioderived NIPU capable of ambient curing. Given the potential to form a multitude of aldehyde-functionalized furanic structures from 5-(hydroxymethyl)furfural, this increases the dialdehyde cross-linker options under consideration for formulation in bioderived NIPUs utilizing aldehyde-carbamate cross-linking.
机译：生物化的聚氨基磺酸根与石化衍生的和生物质衍生的二醛交联，形成非异氰酸酯聚氨酯（NIPUS）。通过经汽油酰基通过经碳酸化合物从大豆类加工的醇酸醇和多元醇和环氧化蔗糖大酸盐多元醇合成生物化的聚氨基磺酸盐。聚氨基磺酸盐与1,4-环己酰基甲醛和2,5-离子氧基甲醛（DFF）交联，以在实验室环境条件下或通过高温固化形成涂层。涂层在光谱上表征，热，并通过标准的ASTM涂层表征表征。在环境条件下固化的涂层对经受升高的温度固化的物质具有类似的性质。环境固化的涂层显示出快速的无粘性时间，Tg值从67到96°C，硬度高，耐溶剂性耐腐蚀性;然而，它们是脆性并且在铝基板上粘附不良。在升高的温度下固化的涂层显示Tg值增加至75-150℃。预处理钢基材上的涂层具有良好的附着力。该研究证明了生物化的DFF的可能性，以用作二醛交联剂以形成具有生物化的氨基甲酸酯官能树脂的乳蛋白，导致能够环境固化的生物化的NIPU。鉴于从5-（羟甲基）糠醛形成多种醛官能化呋喃结构的潜力，这增加了利用醛 - 氨基甲酸酯交联在生物化的尼皮斯中的制剂中考虑的二醛交联剂选择。

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