| A paper strengthening agent is an important kind of important chemical agent used in the papermaking industry, and the development of a new paper strengthening agent is great significance. In this paper, some new paper strengthening agent samples were obtained by treating konjac glucomannan with chemical modification, and their effects on paper properties were studied.Results indicated that carboxymethylated glucomannan could significantly improve the paper properties. Compared to the untreated paper, the density, burst index, tensile index, and folding endurance were increased by 15.2%,22.8%,34.6%,179.0%, respectively, when 0.9% carboxymethylated glucomannan was used. Polyamide-epichlorohydrin (PAE) was used to improve the wet strength of the paper. In addition, dry tensile index and wet tensile index were increased with increasing the carboxymethylation time of glucomannan. The results demonstrated that PAE and carboxymethylated glucomannan displayed a synergistic effect.When 1% oxidized glucomannan (oxidation 60 min,35℃) was added, the burst index, tensile index, and folding endurance increased by 7.0%,16.9%,102.3% respectively, compared to the control. With increasing of oxidation time, the paper strength increased first, then decreased, reaching the maximum in 60 min. In addition, OKG can improve the properties of recycled paper more significantly. When the pH of paper making system was 7, the tensile index, burst index, and folding endurance of the recycled paper increased by 22.2%,19.9%,59.9%, compared to the control.When 1% cationic glucomannan (the cationization temperature was 70 ℃. dosage of cationic reagent was 20% and cationization time was 5 h) was added, the paper tensile index, burst index and folding endurance improved significantly, they increased by 11.0%,13.2%,72.0%, respectively, compared with the control.SEM analysis, FTIR analysis, and elemental analysis illustrated that paper strengthening agent could increase the combination of fibers in paper. |
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