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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。
Author NameAffiliationPostcode
DUAN Yerui College of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Key Lab of Light Chemical Auxiliary Agents of Shaanxi Province， Xi'an， Shaanxi Province， 710021 		710021
SHEN Yiding* College of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Key Lab of Light Chemical Auxiliary Agents of Shaanxi Province， Xi'an， Shaanxi Province， 710021 		710021
LI Xiaorui College of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Key Lab of Light Chemical Auxiliary Agents of Shaanxi Province， Xi'an， Shaanxi Province， 710021 		710021
LIU Yihe College of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Key Lab of Light Chemical Auxiliary Agents of Shaanxi Province， Xi'an， Shaanxi Province， 710021 		710021
YANG Bo College of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Key Lab of Light Chemical Auxiliary Agents of Shaanxi Province， Xi'an， Shaanxi Province， 710021 		710021
LI Chunyan College of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Key Lab of Light Chemical Auxiliary Agents of Shaanxi Province， Xi'an， Shaanxi Province， 710021 		710021
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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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