聚乙烯醇聚合度和醇解度对棉浆纱性能的影响

doi:10.13475/j.fzxb.20250201901

摘要/Abstract

摘要： 在满足浆纱性能要求的基础上,为实现聚乙烯醇(PVA)用量的最小化,通过对10种不同聚合度和醇解度PVA浆料的棉纱上浆性研究,优选出最适合棉纱上浆的PVA规格。采用不同规格聚合度和醇解度PVA,通过调整浆液质量分数以相同的上浆率(8.2±0.1)%对14.6 tex棉纱进行上浆试验,测试浆纱的断裂强力、断裂伸长率、耐磨寿命和毛羽指数;以断裂强力、断裂伸长率、耐磨寿命和毛羽指数作为参数,对浆纱性能进行模糊综合评价。结果表明:PVA聚合度和醇解度对浆纱性能的影响显著,在相同的上浆率下,PVA-0888上浆的浆纱断裂强力最高,PVA-0599上浆的浆纱断裂伸长率最高,PVA-1299上浆的浆纱耐磨寿命最高,PVA-1299上浆的浆纱毛羽减少效果最好;完全醇解的PVA的浆纱性能普遍优于部分醇解PVA,完全醇解PVA以中等聚合度的PVA-1299的浆纱性能最好,PVA-1499次之;部分醇解PVA以PVA-0888的浆纱性能最好,PVA-1288次之;无论是部分醇解还是完全醇解,聚合度过高或者过低都不利于浆纱性能的提高。

关键词: 聚乙烯醇, 聚合度, 醇解度, 棉纱, 单纱浆纱机, 浆纱性能

Abstract:

Objective In order to explore the influence of polyvinyl alcohol (PVA) polymerization and alcoholysis degrees on sizing performance, the performance of cotton yarn sized with 10 different polymerization and alcoholysis degrees of PVA was investigated. The most suitable PVA for cotton yarn was selected by fuzzy comprehensive evaluation method, minimizing the amount of PVA to ensure sizing performance.

Method The sealing performance of the size box of the single yarn sizing machine was improved to keep the size concentration and hence the size pick-up stable. Cotton yarns of 14.6 tex were sized using PVA sizing agents with different degrees of polymerization (500, 800, 1 200, 1 400, 1 700) and alcoholysis (partial, 88%; full, 99%) respectively, and the size pick-up was controlled within the range of (8.2±0.1)% by finely adjusting the size concentration. The size pick-up percentage of sized yarn was obtained using the constant-length gravimetric method. The performance of the sized yarn was tested for breaking strength and elongation at break, wear resistance, and hairiness, which was evaluated using fuzzy comprehensive evaluation taking tested parameters as the indexes for selecting the most suitable PVA polymerization and alcoholysis degrees for cotton yarn sizing.

Results The results showed that the breaking strength of the sized yarns increased and then decreased with increased polymerization degrees of partially and fully alcoholyzed PVA under the same size pick-up, and finally stabilized. The breaking strength of yarns sized with partially alcoholyzed PVA peaked at 800 degree of polymerization, while the breaking strength of yarns sized with fully alcoholyzed PVA reached a maximum 1 200 degree of polymerization. The elongation at break of partially and fully alcoholyzed PVA sized yarns was very similar. However, the elongation at break of sized yarns decreased with increased PVA polymerization degree and ranged from 5.57% to 3.94%. The strength resistance of yarns sized with partially and fully alcoholyzed PVA increased and then reduced with increased degree of polymerization. The strength resistance of yarns sized with partially alcoholyzed PVA reached its maximum at 800 degrees of polymerization. The strength resistance of yarns sized with fully alcoholyzed PVA increased significantly at 1 200 and 1 400 degrees of polymerization. The effect of PVA polymerization degree on the hairiness number of sized yarns was less at the same alcoholysis degree. When the degree of polymerization ranged between 500 and 1 700, the hairiness number of yarns sized with partially alcoholyzed PVA was 18-19, while those sized with fully alcoholyzed PVA showed significantly lower values (9-12). The results of the fuzzy comprehensive evaluation demonstrated that the fully alcoholyzed PVA sizing agent showed superior performance compared to the partially alcoholyzed PVA. Among the fully alcoholyzed PVA, PVA-1299 had the best performance, while among the partially alcoholyzed PVA, PVA-0888 presented the optimal performance.

Conclusion The single yarn sizing experiment method was improved to study the influence of PVA with different degrees of polymerization and alcoholysis on sized yarn properties. It was found that the optimal interval of sizing performance for both partially and fully alcoholyzed PVA was located in the intermediate polymerization degree under the same size pick-up percentage. In addition, the results of fuzzy comprehensive evaluation revealed that for cotton sized yarns, the sizing performance of fully alcoholyzed PVA was usually better than that of partially alcoholyzed PVA, with PVA-1299 showing the finest sizing performance, followed by PVA-1499. This study provides theoretical guidance for size producers to develop intermediate polymerization degree fully alcoholyzed PVA sizing agent, and thus reduce the use of PVA-1799 to further improve the sizing effectiveness.

Key words: polyvinyl alcohol, polymerization degree, alcoholysis degree, cotton yarn, single yarn sizing machine, sizing performance

中图分类号:

TS105.2

史蜜, 王文聪, 范雪荣, 高卫东. 聚乙烯醇聚合度和醇解度对棉浆纱性能的影响[J]. 纺织学报, 2025, 46(09): 181-187.

SHI Mi, WANG Wencong, FAN Xuerong, GAO Weidong. Influence of polyvinyl alcohol polymerization and alcoholysis degrees on performance of cotton-sized yarns[J]. Journal of Textile Research, 2025, 46(09): 181-187.

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链接本文: http://www.fzxb.org.cn/CN/10.13475/j.fzxb.20250201901

http://www.fzxb.org.cn/CN/Y2025/V46/I09/181

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PVA规格	断裂强力/cN	断裂伸长率/%	耐磨次数	3 mm以上毛羽指数/(根·(10 m)^-1)
PVA-0588	380.99	5.46	276	19
PVA-0888	393.74	4.95	360	19
PVA-1288	385.12	4.25	337	18
PVA-1488	383.82	4.31	324	19
PVA-1788	384.65	4.03	282	18
PVA-0599	369.12	5.57	306	12
PVA-0899	370.63	4.85	324	11
PVA-1299	389.21	4.24	377	9
PVA-1499	386.02	4.33	375	10
PVA-1799	385.35	3.94	331	11

PVA规格	断裂强力/cN	断裂伸长率/%	耐磨次数	3 mm以上毛羽指数/ (根·(10 m)^-1)
PVA-0588	0.100	0.119	0.084	0.072
PVA-0888	0.103	0.108	0.109	0.070
PVA-1288	0.101	0.093	0.102	0.072
PVA-1488	0.100	0.094	0.098	0.069
PVA-1788	0.100	0.088	0.086	0.075
PVA-0599	0.096	0.121	0.093	0.112
PVA-0899	0.097	0.106	0.098	0.121
PVA-1299	0.102	0.092	0.114	0.153
PVA-1499	0.101	0.094	0.114	0.137
PVA-1799	0.101	0.086	0.100	0.119

PVA 规格	R_i(权重0.1、 0.1、0.4、0.4)	R_i(权重0.2、 0.1、0.35、0.35)	排序
PVA-0588	0.084	0.086	9
PVA-0888	0.093	0.094	6
PVA-1288	0.089	0.091	7
PVA-1488	0.086	0.088	8
PVA-1788	0.083	0.085	10
PVA-0599	0.104	0.103	5
PVA-0899	0.108	0.107	3
PVA-1299	0.126	0.123	1
PVA-1499	0.120	0.118	2
PVA-1799	0.106	0.105	4