343 nm飞秒激光制备微孔阵列以增强聚氨酯合成革透湿性

郭亮; 任博; 王业伟; 涂昕; 张庆茂

doi:10.11884/HPLPB201830.170044

343 nm飞秒激光制备微孔阵列以增强聚氨酯合成革透湿性

doi: 10.11884/HPLPB201830.170044

华南师范大学广东省微纳光子功能材料与器件重点实验室, 广州 510006

基金项目:

国家重点研发计划项目 2017YFB1104500

广东省自然科学基金项目 2016A030313456

广东省科技项目 2013B090600045

广东省科技项目 2013B090200003

广东省科技项目 2014B010131004

广东省科技项目 2014B010124002

广东省科技项目 2014B090903014

广东省科技项目 2015B090920003

广东省科技项目 2016B090917002

广东省研究生教育创新计划项目 2013JDXM23

广州市科技计划项目 201604040006

详细信息

作者简介:
郭亮(1968—)，男，博士，高级工程师，从事激光先进制造技术等方面的研究; 15323310190@163.com

通讯作者:
张庆茂(1966—)，男，博士，教授，从事激光先进制造技术等方面的研究; zhangqm@scnu.edu.cn

中图分类号: O439
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出版历程
- 收稿日期: 2017-06-27
- 修回日期: 2017-10-23
- 刊出日期: 2018-04-15

Improving water vapor permeability of polyurethane synthetic leather by drilling micro-hole arrays with 343 nm femtosecond laser

Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510006, China

摘要

摘要: 为了提高聚氨酯(PU)合成革透湿性，分别使用343 nm飞秒激光和作为对比的1030 nm飞秒激光及1064 nm纳秒激光制备微孔阵列。采用扫描电镜(SEM)和3D激光扫描显微镜对比研究了微孔形貌。结果表明，343 nm飞秒激光可以制备出效果最佳的微孔。此外，分析了3种激光与PU涂层的作用机理，揭示了343 nm飞秒激光合成革微钻孔过程仅表现为光化学烧蚀，光化学和光热烧蚀同时发生于1030 nm飞秒激光钻孔过程，而1064 nm纳秒激光只显示了光热烧蚀。激光合成革表面钻孔后，测量其透湿性和抗张力。结果显示: 微孔密度越大，皮革透湿性(WVP)越大而抗张力越低，脉冲重叠的增加会导致WVP的增加和抗张力的下降；同时，随着脉冲重叠从91.7%降到50%，微孔直径从45 μm降低到30 μm，而微孔锥度从0.7°增加到12.1°；当脉冲重叠率为91.7%，微孔密度为2550/cm²时，最大的WVP增长率为306%。
- 343 nm飞秒激光 /
- 微孔密度 /
- 脉冲重叠 /
- 聚氨酯合成革 /
- 透湿性 /
- 抗张力
Abstract: In this paper, 343 nm femtosecond laser and as a comparison, 1030 nm femtosecond and 1064 nm nanosecond lasers were used for improving water vapor permeability (WVP) of polyurethane (PU) synthetic leather. The morphologies of micro-hole were comparatively studied via a scanning electron microscope (SEM) and a 3D laser scanning microscope. The results indicated that 343 nm femtosecond laser was optimal to obtain excellent and small drilled micro through-holes. Moreover, analysis of interaction mechanism between laser beam and PU film revealed that the micro-drilling by 343 nm femtosecond laser exhibited photochemical ablation only, micro-drilling by 1030 nm femtosecond laser caused both photochemical and photothermal ablation, while micro-holes drilled by 1064 nm nanosecond laser resulted in photothermal ablation. By measuring the WVP and tensile resistance of the laser-drilled leather, it was concluded that the higher micro-hole density, the higher WVP value and lower tensile resistance, and the increase of pulse overlap led to an increase of WVP and a decrease of tensile resistance. The diameter of micro-hole decreased from 45 μm to 30 μm and taper of micro-hole increased from 0.7° to 12.1° with pulse overlap decreased from 91.7% to 50%. And, the highest WVP growth ratio was 306% at 2550 per sq. cm and the pulse overlap was 91.7%.
- 343 nm femtosecond laser /
- micro-hole density /
- pulse overlap /
- polyurethane synthetic leather /
- water vapor permeability /
- tensile resistance

HTML全文

图 1 在焦平面上激光扫描速度200 mm/s加工微孔的SEM全局图和局部放大图

Figure 1. SEM overview and magnification images of micro-holes drilled with a focus beam at 200 mm/s

下载: 全尺寸图片幻灯片

图 2 不同激光诱导结构相应的能谱图(探测区域已在图 1中标示)

Figure 2. EDS from different representative regions in an area of laser-induced structure (test spots are marked in Fig. 1)

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图 3 图 1的PU层表面激光处理区图像

Figure 3. Pictures of laser-drilled area on PU film of Fig. 1

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图 4 343 nm飞秒激光以不同速度得到的微孔的正面和截面3D扫描显微形貌图

Figure 4. Front view and cross-sectional images by 3D laser scanning microscope of micro-holes drilled by femtosecond laser at 343 nm with different velocity

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图 5 扫描速度固定时，WVP值随微孔密度变化关系图

Figure 5. Water vapor permeability (WVP) value vs micro-hole density at fixed laser scanning speed

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图 6 微孔密度固定时，WVP值随脉冲重叠变化关系图

Figure 6. Water vapor permeability (WVP) value vs pulse overlap at fixed micro-hole density

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图 7 扫描速度固定时，抗张力随着微孔密度变化关系图

Figure 7. Tensile resistance vs micro-hole density at fixed scanning speed

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图 8 微孔密度固定时，抗张力随着脉冲重叠变化关系图

Figure 8. Tensile resistance vs pulse overlap at fixed micro-hole density

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表 1 激光器的详细参数

Table 1. Specification parameters of lasers

laser	average power/W	wavelength/nm	pulse duration	frequency/kHz	focal spot diameter/μm	beam quality
YDFLP-20-LP1-S	>20	1064	200 ns	1~400	45	< 1.3
S-Pulse HP2	>8	1030	< 500 fs	1~300	38	< 1.3
S-Pulse HP2	< 1	343	< 500 fs	1~300	12	< 1.3

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表 2 PU合成革激光打孔参数

Table 2. Laser-drilled parameters of PU synthetic leather

micro-hole spacing/mm	micro-hole density/cm^-2	scan velocity/(mm·s^-1)
		50
		100
0.2	2550	200
		300
		50
		100
		200
0.5	420	300
		50
		100
1	110	200
1	110	300
2	30	50
		100
		200
		300

下载: 导出CSV

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