等离子体协同过氧化氢活化体系对纯棉水刺非织造布的练漂处理

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等离子体协同过氧化氢活化体系对纯棉水刺非织造布的练漂处理

Scouring and bleaching of cotton nonwoven fabrics using plasma-assisted hydrogen peroxide activation system

等离子体协同过氧化氢活化体系对纯棉水刺非织造布的练漂处理

Scouring and bleaching of cotton nonwoven fabrics using plasma-assisted hydrogen peroxide activation system

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doi:10.13475/j.fzxb.20240201901

纺织学报 ›› 2024, Vol. 45 ›› Issue (12): 118-127.doi: 10.13475/j.fzxb.20240201901

肖鑫¹, 李伟², 卢润¹, 姜会钰¹^,³, 李青¹^,³()

1.武汉纺织大学纺织科学与工程学院, 湖北武汉 430200
2.烟台业林纺织印染有限责任公司, 山东烟台 261400
3.武汉纺织大学生物质纤维与生态染整湖北省重点实验室, 湖北武汉 430200

收稿日期:2024-02-20 修回日期:2024-09-05 出版日期:2024-12-15 发布日期:2024-12-31
通讯作者: 李青(1986—),女,副教授,博士。主要研究方向为清洁染整技术的研发与应用。E-mail: liqing@wtu.edu.cn。
作者简介:肖鑫(2000—),男,硕士生。主要研究方向为低温练漂技术的研发与应用。
基金资助:
国家自然科学基金青年基金项目(52303062);生物质纤维与生态染整湖北省重点实验室开放课题(STRZ202303);湖北省科技厅重点研发计划(助企纾困及包保联2022BAD012)

XIAO Xin¹, LI Wei², LU Run¹, JIANG Huiyu¹^,³, LI Qing¹^,³()

1. School of Textile Science and Engineering, Wuhan Textile University, Wuhan, Hubei 430200, China
2. Yantai Yelin Textile Printing & Dyeing Co., Ltd., Yantai, Shandong 261400, China
3. Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University, Wuhan, Hubei 430200, China

Received:2024-02-20 Revised:2024-09-05 Published:2024-12-15 Online:2024-12-31

摘要：

针对纯棉水刺非织造布练漂温度高、碱性强、纤维损伤严重等问题,先对其进行等离子体处理,再构建过氧化氢/五乙酰葡萄糖(H₂O₂/PAG)体系进行练漂处理。对处理前后样品的表面元素组成、微观形貌和结晶结构进行表征,探究等离子体的助漂机制。通过单因素实验分析了等离子体处理时间、H₂O₂和PAG浓度、NaHCO₃浓度、练漂温度和时间对非织造布白度的影响,优化了处理工艺。结果表明:与NaOH/H₂O₂体系练漂效果相近时,H₂O₂/PAG体系能将处理温度降低20 ℃,pH值维持在5~7,在此基础上引入等离子体可进一步将H₂O₂浓度降低50%,或将练漂时间缩短一半;等离子体通过刻蚀纤维表面,增加含氧基团与无定形区比例,使漂液更易渗透纤维,从而提高练漂效率。优化工艺为:等离子体处理时间5 min,漂液中含30 mmol/L H₂O₂,7.5 mmol/L PAG,30 mmol/L NaHCO₃,在70 ℃处理30 min。此工艺条件下处理的样品白度可提升23.8%,水滴铺展时间小于1 s,该效果超过了H₂O₂/PAG体系与H₂O₂/NaOH体系的练漂效果。

关键词: 等离子体, 低温练漂, 棉非织造布, 过氧化氢, 功能纺织品

Abstract:

Objective As a healthy and environmentally friendly cotton fiber product, cotton nonwoven fabrics have been widely applied in various fields. All natural cotton fiber contains pigment impurities and needs to be scoured and bleached. Hydrogen peroxide (H₂O₂) bleaching is usually carried out in high-temperature and strong-alkali environment. The H₂O₂/activator system can effectively reduce the bleaching temperature and alkalinity. However, partial activators possess ecotoxicity. This research aims to explore for cleaner and more effective scouring and bleaching methods.

Method Firstly, the cotton nonwoven fabric was pre-treated with a plasma cleaning machine for 5 min. Subsequently, the fabric was immediately immersed in H₂O₂/PAG bleaching solution for treatment at 70 ℃ for 30 min in a constant-temperature dyeing machine. After the treatment, the fabric was squeezed and laundered thoroughly before being air-dried. The solution mentioned above contained H₂O₂, PAG, NaHCO₃, and EDTA-2Na. The fabric's whiteness and hydrophilicity were tested to evaluate the bleaching and scouring performance, respectively. The influences of plasma treatment on the chemical structure of cotton fiber were analyzed using X-ray photoelectron spectrum, scanning electron microscopy, and X-ray diffraction.

Results For achieving comparable bleaching effect via the NaOH and H₂O₂ routes, the H₂O₂/PAG system was able to reduce the bleaching temperature by 20 ℃ and to maintain the pH value at 5-7. On this basis, the introduction of plasma was shown to further reduce the H₂O₂ concentration by 50% or shorten the bleaching time by half, and the degree of polymerization was decreased by 3.6%. Plasma treatment significantly improved the hydrophilicity of cotton nonwoven fabrics. Specifically, the contact angle of water droplets reduced from 106.7° to 38.1°, and the wicking height within 30 min increased from 0 to 5.7 cm. Analysis of the X-ray energy spectrum indicated that both the content of oxygen elements and the number of polar oxygen-containing groups on the fiber surface increased after plasma treatment. Some grooves on the plasma-etched fibers were observed by means of scanning electron microscope. The results of the X-ray diffraction test showed a reduction in the cotton fiber's crystallinity by 13.4% compared with the untreated original fiber. The results of single-factor experiments demonstrated the following. Prolonging the plasma treatment time had little effect on the whiteness and yellowness of the nonwoven fabrics, but it evidently enhanced their hydrophilicity. An increase of H₂O₂ and PAG concentration produced more peracetic acid, contributing to an increase in whiteness and a decrease in the pH of the solution. The pH medium created by 30 mmol/L NaHCO₃ was suitable for the complete perhydrolysis of PAG, resulting in a near-neutral environment and desired bleaching results. Temperature was a significant factor affecting the whiteness of bleached fabrics. Fabrics' yellowness increased instead when the bleaching temperature exceeded 70 ℃. The whiteness showed a rapid increase within the scouring and bleaching duration of 0 to 30 min, indicating the high efficiency of the plasma/H₂O₂/PAG system. Further extension of time did not result in significant whiteness improvement.

Conclusion Approximate whiteness enhancement is obtained from plasma/H₂O₂/PAG and H₂O₂/NaOH system. However, 50% H₂O₂ concentration, 20 ℃ temperature, or 50% bleaching duration can be saved when using the front system. Moreover, plasma/H₂O₂/PAG system can provide a near-neutral pH environment. Thanks to the mild bleaching environment, the polymerization of cotton fiber only decreases by 3.6%. Plasma treatment increases the number of oxidation groups on the surface of the cotton fiber, induces physical etching on its surface, and improves the proportion of the amorphous zone. Above changes in fiber's structure achieves an apparent improvement in hydrophilicity of cotton non-woven fabric. As a result, the penetration and oxidation efficiency of the bleaching agent towards pigment impurities are correspondingly improved. When the optimal process parameters are applied (with concentrations of H₂O₂, PAG, and NaHCO₃ at 30, 7.5, and 30 mmol/L respectively, and plasma treatment for 5 min, followed by 70 ℃ bleaching for 30 min), the whiteness of the fabric can reach 82.1%, which is 23.8% higher than untreated fabric.

Key words: plasma, low-temperature scouring and bleaching, cotton nonwoven fabric, hydrogen peroxide, functional textile

中图分类号:

TS192.5

肖鑫, 李伟, 卢润, 姜会钰, 李青. 等离子体协同过氧化氢活化体系对纯棉水刺非织造布的练漂处理[J]. 纺织学报, 2024, 45(12): 118-127.

XIAO Xin, LI Wei, LU Run, JIANG Huiyu, LI Qing. Scouring and bleaching of cotton nonwoven fabrics using plasma-assisted hydrogen peroxide activation system[J]. Journal of Textile Research, 2024, 45(12): 118-127.

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链接本文: http://www.fzxb.org.cn/CN/10.13475/j.fzxb.20240201901

http://www.fzxb.org.cn/CN/Y2024/V45/I12/118

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样品编号	H₂O₂浓度/ (mmol·L^-1)	PAG浓度/ (mmol·L^-1)	渗透剂质量浓度/ (g·L^-1)	温度/ ℃	时间/ min	等离子体	漂液pH值		白度/%	白度提升率/%
样品编号	H₂O₂浓度/ (mmol·L^-1)	PAG浓度/ (mmol·L^-1)	渗透剂质量浓度/ (g·L^-1)	温度/ ℃	时间/ min	等离子体	处理前	处理后	白度/%	白度提升率/%
1	0	0	0	0	0	×	—	—	66.3±1.4	—
2	0	0	0	0	0	√	—	—	66.7±0.4	0.6
3	60	0	2.0	90	60	×	10.6	9.7	83.1±0.3	25.3
4	60	15	2.0	70	60	×	7.2	5.0	83.4±0.3	25.8
5	60	15	0	70	60	×	7.3	5.0	81.8±0.2	23.4
6	30	7.5	0	70	60	√	7.4	6.7	83.6±0.3	26.1
7	60	15	0	70	30	√	7.3	5.6	83.2±0.6	25.5
8	60	15	0	50	60	√	7.3	6.7	82.4±0.3	24.3
9	60	15	0	70	60	√	7.2	4.9	86.6±0.3	30.6
10	30	7.5	0	70	60	×	7.4	6.7	76.6±1.2	15.5
11	60	15	0	70	30	×	7.3	5.6	77.0±1.0	16.1
12	60	15	0	50	60	×	7.3	6.7	76.5±0.8	15.4

样品编号	芯吸高度/cm	水滴铺展时间/s	接触角/(°)
1	0	>60	106.7
2	5.7±0.8	<1	38.1
3	3.5±0.8	<1	64.3
4	2.8±0.2	1.3±0.1	77.5
5	0.5±0.1	>60	96.7
6	3.1±0.3	3.9±0.6	84.8
7	3.1±0.3	4.5±0.6	86.1
8	2.5±0.6	5.7±0.7	90.4
9	4.0±1.1	<1	57.3
10	0.6±0.2	>60	101.1
11	0.7±0.3	>60	103.8
12	0.4±0.1	>60	105.2

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