摘要
生物炭填充到植物纤维中可用于制造黑色地膜,具有降低透光率,抑制杂草生长,减少热辐射,发挥保湿作用。填加生物炭导致烷基烯酮二聚体(AKD)施胶效率及材料力学性能降低。研究提出一种利用湿部助剂阳离子淀粉(CS)和阳离子聚丙烯酰胺(CPAM)提高AKD施胶效率的工艺。通过吸附试验阐明生物炭对AKD、CS和CPAM的吸附均是单分子层化学吸附。AKD用量为0.6 wt%时施胶效果提高显著,施胶度达到37.77 s,阳离子淀粉最佳用量为1.0 wt%,施胶度提高57.51%,干抗张强度提高35.10%,撕裂度提高32.94%,耐破度提高18.56%。阳离子聚丙烯酰胺最佳用量为0.1 wt%,施胶度提高55.65%,干抗张强度提高29.23%,撕裂度提高22.94%,耐破度提高25.98%。在最佳助剂用量下加入填料对AKD施胶效率和力学性能产生负面影响。利用阳离子淀粉包覆AKD胶粒,阳离子聚丙烯酰胺通过不对称桥联将AKD胶粒絮凝到纤维上,与常规施胶工艺相比有效降低填料带来的负面影响,材料施胶度提高25.04%,干抗张强度提高12.54%,撕裂度提高10.35%,耐破度提高15.74%。研究可为高负载多孔材料施胶工艺提供改进思路。
Biochar filled into plant fibers can be used to manufacture black ground films,which have the benefits of reducing light transmission to inhibit weed growth,while also decreasing thermal radiation to help retain moisture.However,the addition of biochar leads to low alkyl ketene dimmer(AKD)sizing efficiency and reduced material mechanical properties.This study proposed a process to improve the AKD sizing efficiency using cationic starch(CS)and cationic polyacrylamide(CPAM)as wet-end additives.The adsorption experiment indicated that the main adsorption mechanism of additives by biochar was chemical adsorption on the monolayer.The effect of sizing efficiency was significantly improved when AKD content was 0.6 wt%,with a sizing degree of 37.77 s.The optimal content of cationic starch was 1.0 wt%,which increased the sizing degree by 57.51%,dry tensile strength by 35.10%,tearing strength by 32.94%,and bursting strength by 18.56%.The optimal content of cationic polyacrylamide was 0.1 wt%,which increased the sizing degree by 55.65%,dry tensile strength by 29.23%,tearing strength by 22.94%,and bursting strength by 25.98%.The the addition of filler under the optimal additives content would have a negative impact on the AKD sizing efficiency and mechanical properties.Cationic starch encapsulated the AKD particles and then the cationic polyacrylamide bridged the AKD particles and the fibers through asymmetric bridging.Compared to the conventional sizing process,the sizing degree of the composite was increased by 25.04%,dry tensile strength by 12.54%,tearing strength by 10.35%,and bursting strength by 15.74%.This study provided an improvement method for the sizing process of high-loaded porous materials.
作者
唐志伟
王素素
孔德志
张颖
刘爽
李龙海
罗立娜
陈海涛
李睿
TANG Zhiwei;WANG Susu;KONG Dezhi;ZHANG Ying;LIU Shuang;LI Longhai;LUO Lina;CHEN Haitao;LI Rui(School of Engineering,Northeast Agricultural University,Harbin 150030,China;Heilongjiang Province Technology Innovation Center of Mechanization and Materialization of Major Crops Production,Harbin 150030,China)
出处
《东北农业大学学报》
CAS
CSCD
北大核心
2024年第3期71-82,共12页
Journal of Northeast Agricultural University
基金
黑龙江省“双一流”学科协同创新成果重点项目(LJGXCG2023-066)
黑龙江省重点研发计划指导类(GZ20210177,GZ20210160)
黑龙江省自然科学基金联合引导项目(LH2021E005)。
关键词
施胶
填料
包覆
絮凝
不对称桥联
sizing
filler
encapsulation
flocculation
asymmetric bridging
