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| 羧甲基淀粉的制备及其用作纸张增强剂的研究 |
| Study on the Preparation of Carboxymethyl Starch and Its Application as Paper Strength Agent |
| 收稿日期：2024-10-25 |
| DOI：10.11980/j.issn.0254-508X.2025.05.012 |
| 关键词: 马铃薯淀粉 羧甲基淀粉 取代度 造纸助剂 |
| Key Words:potato starch carboxymethyl starch degree of substitution papermaking additives |
| 基金项目:中国轻工业集团有限公司科技创新重点专项基金（ZQ2023GS02）。 |
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| 摘要:本研究以马铃薯淀粉、氢氧化钠和氯乙酸为原料，在乙醇介质中制备了取代度为0.041~0.973的羧甲基淀粉，探究了乙醇体积分数、碱化温度等因素对羧甲基淀粉取代度，以及不同取代度羧甲基淀粉对纸张性能的影响。结果表明，在低取代度下，羧甲基化过程主要发生在淀粉颗粒表面的非结晶区；随着取代度的增大，羧甲基化过程主要发生在淀粉颗粒内部的结晶区。加入取代度0.419的羧甲基淀粉对纸张的增强效果最好，此时，纸张的拉伸强度、耐破度和撕裂度分别为16.5 MPa、63.3 kPa和136 mN，与未添加羧甲基淀粉的纸张相比，分别提高了31.0%、15.3%和43.5%。 |
| Abstract:In this study， potato starch， sodium hydroxide， and monochloroacetic acid were used to prepare carboxymethyl starch with a degree of substitution ranging from 0.041 to 0.973 in ethanol medium. The effects on the degree of substitution of carboxymethyl starch were investigated， including ethanol volume fraction， alkalization temperature and carboxymethyl starch with different degrees of substitution on paper properties. The results showed that under low degree of substitution， the carboxymethylation process mainly occurred in the amorphous region on the surface of starch granules. As the degree of substitution increased， the carboxymethylation process mainly occurred in the crystallization region inside the starch granules. It was found that the addition of carboxymethyl starch with a degree of substitution of 0.419 had the best reinforcement effect on paper. The tensile strength， burst strength， and tear strength of the paper were 16.5 MPa，63.3 kPa and 136 mN. Compared with the paper without carbaxymethgl starch， the tensile strength， bursh strength， and tear strength had increased by 31.0%， 15.3%， and 43.5%， respectively. |
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