封闭型水性聚氨酯合成及在纸张表面施胶中的应用  

Synthesis of Closed Waterborne Polyurethane and Its Application in Paper Surface Sizing

作　　者：段业睿 沈一丁[1,2] 李小瑞 刘一鹤[1,2] 杨博 李春艳 DUAN Yerui;SHEN Yiding;LI Xiaorui;LIU Yihe;YANG Bo;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)

机构地区：[1]陕西科技大学化学与化工学院,陕西西安710021 [2]陕西省轻化工助剂重点实验室,陕西西安710021

出　　处：《中国造纸》2021年第12期31-38,共8页China Pulp & Paper

基　　金：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。

摘　　要：采用一步聚合法,以聚乙二醇350单甲醚(mPEG350)、丁二醇(BDO)、二羟甲基丙酸(DMPA)、异佛尔酮二异氰酸酯(IPDI)为原料进行聚合,得到一种封闭型的水性聚氨酯(BWPU)。将质量分数1%的BWPU与质量分数4%的PVA复配成施胶液(SSA),用于纸张表面施胶。结果表明,当DMPA添加量为10%、n(mPEG350)∶n(BDO)=1∶0.2、n(—NCO)∶n(—OH)(R值)为1.8,甲乙酮肟(MEKO)添加量为21.3%时,制备得到的BWPU性能最佳,其粒径为291.0 nm,分散稳定性指数(TSI)为1.33。施胶后的纸张撕裂指数为11.9 mN·m^(2)/g,挺度为95.8 mN,抗张指数为82.6 N·m/g,耐折度为3394次,接触角为79.69°,施胶度为28.14°;与原纸相比,各项指标分别提高了76.8%、43.4%、7.8%、71.2%、26.3%,1307.0%。与市售施胶剂施胶后纸张相比,各项指标分别提高了20.9%、8.1%、15.9%、15.2%、10.3%、24.0%。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·m^(2)/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.

关 键 词：封闭型水性聚氨酯 R值 表面施胶 纸张性能 

分 类 号：TS727.5[轻工技术与工程—制浆造纸工程]