Influence of Retention System and Curing on Paper Wet Strength Improvement by a Copolymer Containing Glycidyl Groups

摘要

The copolymer (PGS) synthesized by polymerization of glycidyl methacry-late with styrene had a significant effect on paper wet strength. Factors such as retention aids, curing temperature, and curing time were investigated. The results showed that among four kinds of partially aminated poly N-vinylformamide (APNVF), APNVF-4 that had the highest charge density was the most effective for strengthening paper. The effectiveness of the retention systems increased with their wet functionality ill the order APNVF-4 > C-PAM = PAAm > PEl > PDADMAC. The curing tempera-ture and curing time had little influence on paper dry strength, but they influenced paper wet strength greatly. The FTIR studies on model reactions showed that glycidyl groups could react with amino groups and carboxyl groups under common curing conditions.