STARCH-STARKE
·
2024
·
IF 2.6
Shaomin Kang,Jiaqi Guo,Igor S. Makarov,Mohammad Rizwan Khan,Huining Xiao,Junlong Song
Cationic starch serves as a prevalent wet-end additive in the papermaking industry. Yet, the definitive effects of the ratio between the two principal components—amylose (AM) and amylopectin (AP)—and the degree of substitution (DS) on the mechanical strength enhancement of paper sheets remain incompletely understood. This study synthesizes a series of quaternized amylose (QAM) and quaternized amylopectin (QAP) with varying DS levels and blended these derivatives in diverse ratios. Subsequently, these mixtures are integrated into pulp suspensions to ascertain the DS and the AM-to-AP ratio that optimize paper strength. These results indicate that a QAM-to-QAP blend with a DS of 0.08 at a ratio of 2:8 yielded the most pronounced improvement in paper mechanical properties. This precise formulation significantly enhances tensile, burst, and tear strength indices, increasing by approximately 55.0%, 44.4%, and 78.4%, respectively, under the most favorable conditions and with an additive dosage of 1 wt.%. This investigation provides substantive and actionable knowledge for selecting starch additives in the wet-end of papermaking, which can significantly augment the efficiency and efficacy of paper manufacturing processes.
研究领域:
造纸科学
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yali Gao,Weisheng Yang,Wenbo Yi,Shuzhen Ni,Yingjuan Fu,Menghua Qin,Fengshan Zhang
In recent years, researchers have put much attention on the improvements and upgrades of novel wet strength agent in the papermaking fields, especially in the usage of household paper. Herein, PEI M -KH560 by polyethyleneimine (PEI) and γ-glycidyl ether propyl trimethoxysilane (KH560) was synthesized with five molecular weights (Mw) of PEI at 600, 1800, 10,000, 70,000 and 750,000. Results showed that the molecular weight greatly influenced the physicochemical properties of PEI-KH560, such as the size and thermal stability. The intrinsic cationic charge of PEI-KH560 provided the bonding sites with the paper fibers, forming strengthened fiber-fiber joints. It was shown that the dry, wet strength and hydrophobicity of cellulosic paper sheets were obviously improved. When the m (PEI):m(KH560) is 1:2, the strength of papers after sizing by Mw of PEI at 600 and 1800 is the most obvious, with the dry strength increased by 227.9 % and 187.5 %, and the wet strength increased by 183.8 % and 207.8 %, respectively. The maximum hydrophobicity was found at the PEI 1800 -KH560 with the contact angle value of 130.6°. The resultant environmental-friendly agent (PEI-KH560) obtained in this work provides valuable significance for the preparation of household and food packaging paper.
研究领域:
制浆造纸工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yi Zhao,Shuzhen Ni,Ying Gao,Xin Zhang,Xingxiang Ji,Fengshan Zhang
Novel eco-friendly strength agent has inspired much attention of researchers. Herein, the PEI-KH560 prepared by PEI (polyethyleneimine) and KH560 (γ-glycidyl ether propyl trimethoxysilane) was added in the pulp suspension to enhance the paper performance. The results showed that the m(PEI):m(KH560) ratio and PEI's molecular weight were closely related with the paper strength and hydrophobicity. The SEM morphology of paper surface showed that the fiber-fiber crosslinking reached the tightest, at the optimal m(PEI):m(KH560) ratio and PEI's molecular weight. The results showed that when the M w (molecular weight) of PEI was 10,000 and the m(PEI):m(KH560) ratio was 1:2, the PEI-KH560 presented the best strengthening performance on the paper strength and hydrophobicity. Dry tensile index and wet tensile index could reach 29.9 N·m/g and 1.37 N·m/g after adding the PEI 10000 -KH560 in pulp suspension before the paper formation. Further, the effect of process conditions (temperature, time, the addition amount, and pulp concentration) on the strength and hydrophobicity of paper network structure was investigated, after adding PEI-KH560 into the pulp suspension. It was of great significance for studying the mechanism between the chemical structures of PEI-KH560 and paper performance, which provided valuable theoretical practice on the preparation of novel strength agent.
研究领域:
材料科学
·
造纸工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2018
·
IF 3.849
Yushuang Zhao,Shuangshuang Jing,Xiaoting Zhang,Zehong Chen,Hao Zhuo,Yijie Hu,Qingzhong Liu,Linxin Zhong,Xinwen Peng,Runcang Sun
Although hemicelluloses have demonstrated their promising application as paper strengthening agents, the influences of different hemicellulosic fractions on the mechanical properties of paper are not clear. Revealing the reinforcing effect of hemicellulosic fractions on the mechanical properties of paper is very helpful to better utilize hemicelluloses. For this purpose, four hemicellulosic fractions (HC pH5.5 , HC 15% , HC 30% , and HC 75% ) were extracted from corncob, and then chemically modified (carboxymethylation) as paper strengthening agents. We demonstrated that the hemicellulosic fraction HC 15% obtained from 15% ethanol was difficult to be modified; while HC 75% obtained from 75% ethanol was more easily chemically modified. Furthermore, the carboxymethylated hemicellulosic fraction CHC 30% with fewer branches and the highest molecular weight had a more significant effect on improving paper strength. Therefore, isolation of desirable hemicellulosic fraction is extremely important to more effectively apply hemicelluloses as paper strengthening agents.
研究领域:
制浆造纸工程
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 46
·24586-24592
·
IF 2.562
Junlong Song,Aijian He,Yongcan Jin,Qiang Cheng
A facile procedure to synthesize an amphoteric cellulose (AC) derivative in one pot using NaOH–urea solution as solvent was developed to avoid the time-consuming separation and purification between steps in conventional methods. Microcrystalline cellulose (MCC) was initially dissolved in 7 wt% NaOH–12 wt% urea aqueous solution at cold temperature and followed by reaction of 3-chloro-2-hydroxyl-propyltrimethyl ammonium chloride and 3-chloro-2-hydroxypropanesulfonic acid sodium salt sequentially or simultaneously at a designed temperature in one container. The degree of substitution (DS) values for positively and negatively charged groups were found to be a function of reaction temperature, dosages of cationic and anionic reagents, reaction time and the addition order of the two reagents. The total DS values of obtained ACs ranged between 0.046 and 0.76, all AC samples except AC-1 were soluble in water. The paper strength performance of ACs was tested and the results indicate that the strength improvement of AC products strongly relates to the DS of ACs. The product with DS of 0.69 can improve the tensile, tear and burst strength index of a paper sheet by about 20% compared with the control at a dosage of 1%.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）