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首页> 外文期刊>Journal of Applied Polymer Science >Commercial lignosulfonates from different sulfite processes as partial phenol replacement in PF resole resins
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Commercial lignosulfonates from different sulfite processes as partial phenol replacement in PF resole resins

机译：不同亚硫酸盐过程的商业木质素磺酸盐作为PF resole树脂中的偏苯酚替代品

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摘要

Four commercial spruce lignosulfonates representing the most common acidic, neutral, and alkaline sulfite pulping processes and varying significantly in molecular weight characteristics were tested as partial (40 wt %) phenol substitute materials for the manufacture of lignosulfonate-phenol-formaldehyde (LPF) resole resins. Similar as recently reported for technical lignins from nonsulfite pulping processes (kraft, soda, organosolv), all lignosulfonates of this study effectuated a faster viscosity gain during resole cooking compared to the lignin-free reference resin (1000 mPa s after 120 min vs. 250 min to reach 1000 mPa s). Sodium lignosulfonate featuring the lowest weight average molecular weight (M-w 5780 g mol 21) and dispersity (D 6.1) turned out to be superior to the other lignosulfonates with regard to curing rate (B-time; 3:37 min vs. 6:41-9:08 min) and tensile shear strength development under hot pressing (120 degrees C; T-S,T-max = 55.64 N mm(-2) after 8 min) for beech veneer strips glued together with the respective LPF resins. Calcium and magnesium lignosulfonates are less suited with regard to phenol replacement due to the poor performance of the respective LPF adhesives in terms of tensile shear strength (T-S,T-max = 53.29-3.49 N mm(-2) after 12 min) most likely caused by considerable amounts of side products formed in the course of formose-type reactions. Phenolation of the two promising lignosulfonates, that is, sodium and ammonium lignosulfonate, did neither considerably increase the rate of PF network formation during resin cooking and curing nor improve tensile strength development during hot pressing. (C) 2017 Wiley Periodicals, Inc.
机译：代表最常见的酸性，中性和碱性亚硫酸盐制浆方法的四种商业云核酸盐，以分子量特征显着显着变化，为均硫酸盐 - 苯酚 - 甲醛（LPF）Resole树脂的均值（40wt％）酚替代材料。类似于最近据报道从非硫酸盐制浆方法（牛皮纸，苏打，有机溶胶）的技术木质素，而该研究的所有木质素磺酸盐在与木质素的基准树脂（120分钟后1000MPa S之后1000MPa S相比，在Rignin的参考树脂（1000MPa S）相比，该研究的所有木质素磺酸盐在弥孔烹饪过程中达到了更快的粘度增益分钟达到1000 MPa s）。木质素磺酸钠具有最低的重量平均分子量（MW 5780g Mol 21）和分散性（D 6.1），结果优于固化率（B-Time; 3:37 min与6:41）优于其他木质素磺酸盐-9：08分钟）和在热压下的拉伸剪切强度显影（120摄氏度; TS，T-MAX = 55.64 n mm（-2）后8分钟后，用于与相应的LPF树脂一起粘合在一起的山毛榉胶合板。钙和镁木质素磺酸盐由于在抗拉剪切强度（TS，T-MAX = 53.29-3.49 n Mm（-2）在12分钟后的相应LPF粘合剂的性能差而导致的苯酚替代物。最有可能由在骨肉型反应过程中形成的相当大量的侧面产品引起。两种有前途的木质素磺酸盐的酚醛化，即钠和硫磺酸铵，在树脂烹饪和固化过程中既没有大幅增加PF网络形成的速率，也没有改善热压期间的拉伸强度发展。 （c）2017 Wiley期刊，Inc。

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