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Synthesis and Application of Highly Cationic Starch-based Styrene-acrylate Copolymeric Emulsion for Papermaking
Received:March 22, 2024  
DOI：10.11980/j.issn.0254-508X.2024.09.012
Key Words:cationic surface sizing agent  styrene-acrylate copolymeric emulsion  soap-free polymerization  highly cationic starch
Author NameAffiliationPostcode
LIU Yi School of Environment and Natural Resources， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 310023
WANG Lijun* School of Environment and Natural Resources， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 310023
FU Wenhui Shanxi Qiangwei Paper Co.， Ltd.， Jinzhong， Shanxi Province， 045499 045499
JIA Ding Shanxi Qiangwei Paper Co.， Ltd.， Jinzhong， Shanxi Province， 045499 045499
LAI Yifan Chemigate OY， Lapua， 62100， Finland 62100
MARTIN Ekman Chemigate OY， Lapua， 62100， Finland 62100
TOM Schauman Chemigate OY， Lapua， 62100， Finland 62100
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Abstract:Soap-free emulsion polymerizations of styrene-acrylate surface sizing agent for papermaking were carried out using styrene （St）， n-butyl acrylate （BA）， and tert-butyl acrylate （tBA） as monomers， H2O2-FeSO4 as initiator， and a series of highly cationic starches （HCS） as emulsifiers. The effects of dosage， molecular weight （characterized by intrinsic viscosity）， and degree of substitution of the HCS on the emulsion polymerization were discussed. A variety of methods were used to evaluate the physical and chemical properties as well as the application performance of the emulsions. The prepared styrene-acrylate emulsion had a small average particle size of colloidal particles （126.2 nm）， and strong positive charge properties （Zeta potential was 25.8 mV） and had excellent storage stability， when it was applied to corrugated base paper， the Cobb value of the sized paper was 21.6 g/m2， and the water droplet contact angle reached 121.6°. A mechanistic explanation for the reason why it could give paper better surface sizing effects was also provided.
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