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Preparation and Surface Sizing Properties of KH560 Modified Polyvinyl Alcohol
Received:May 22, 2022  
DOI：DOI：10.11980/j.issn.0254-508X.2022.12.008
Key Words:cross-linking  KH560  polyvinyl alcohol  surface sizing
Author NameAffiliationPostcode
ZHANG Jiani College of Chemistry and Chimical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021
Shaanxi Key Lab of Chemical Additives for Industry， Xi’an， Shaanxi Province， 710021 		710021
SHEN Yiding* College of Chemistry and Chimical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021
Shaanxi Key Lab of Chemical Additives for Industry， Xi’an， Shaanxi Province， 710021 		710021
LIU Yihe College of Chemistry and Chimical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021
Shaanxi Key Lab of Chemical Additives for Industry， Xi’an， Shaanxi Province， 710021 		710021
DANG Yuanyuan College of Chemistry and Chimical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021
Shaanxi Key Lab of Chemical Additives for Industry， Xi’an， Shaanxi Province， 710021 		710021
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Abstract:The silane coupling agent γ-glycidyl ether propyl trimethoxysilane （KH560） was used to graft-modify polyvinyl alcohol （PVA） with different polymerization degrees and alcoholysis degrees， respectively. The physicochemical properties of PVA modified by KH560 and their enhancement effect on the physical properties of paper after surface sizing were discussed. The results showed that owing to the high activity of silanol groups， the Si—O—C bonds were linked with hydroxyl groups of paper fiber by dehydration and condensation， which were synergistic reacted with hydrogen bonds between hydroxyl groups and formed three-dimensional cross-linked network in KH560-PVA1799， so that it showed excellent surface sizing performance. The paper after surface sizing had folding endurance of 232 times， stiffness of 71.7 mN， tear index of 14.9 mN∙m2/g， contact angle of 63° and sizing degree of 26 s. Compared with the paper sizing with unmodified PVA， they were increased by 112.8%， 39.0%， 90.2%， 23.5% and 136.3%，respectively.
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