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Synthesis of Closed Waterborne Polyurethane and Its Application in Paper Surface Sizing |
Received:May 25, 2021 |
DOI:10.11980/j.issn.0254-508X.2021.12.005 |
Key Words:closed waterborne polyurethane R value surface sizing paper properties |
Fund Project:高分子/小分子复合表面活性剂驱油体系的制备及应用基础(2013SZS10-Z01)陕西省科技统筹创新工程重点实验室项目。 |
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Abstract:A one-step polymerization method was used to prepare a closed aqueous polyurethane (BWPU) polymerized with polyethylene glycol 350 monomethyl ether (mPEG350), butanediol (BDO), dimethylolpropionic acid (DMPA), and isophorone diisocyanate (IPDI) as raw materials. The 1% BWPU and 4% PVA were compounded into a sizing solution (SSA) for paper surface sizing. The results showed that the optimized performance of BWPU could be obtained with the DMPA content of 10%, n(mPEG350)∶n(BDO)=1∶0.2, R value of 1.8, and ethyl methyl ketone oxime (MEKO) content of 21.3%, of which the particle size was 291.0 nm and the TSI was 1.33. After surface sizing, the paper had a better performance with the tear index of 11.9 mN·m2/g, the stiffness of 95.8 mN, the tensile index of 82.6 N·m/g, the folding endurance of 3394 times, the contact angle of 79.69°, and the sizing degree of 28.14°. Compared with the original paper, the indicators increased by 76.8%, 43.4%, 7.8%, 71.2%, 26.3%, 1307.0%, respectively. Compared with the paper sized with sizing agent on the market, the indicators increased by 20.9%, 8.1%, 15.9%, 15.2%, 10.3%, 24.0%, respectively. |
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