Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (04): 106-111.doi: 10.13475/j.fzxb.20180804506

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Study on enhancement of hydrophobicity treatment of cotton fabrics using silica sol

TAN Lin, SHI Yidong(), ZHOU Wenya   

  1. College of Biomass Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China
  • Received:2018-08-15 Revised:2020-01-15 Online:2020-04-15 Published:2020-04-27
  • Contact: SHI Yidong E-mail:shiyidong@scu.edu.cn

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Abstract:

In order to obtain the super hydrophobicity in cotton fabrics through an environmentally friendly approach, the present study applied tetraethylorthosilicate(TEOS) as precursor, ethanol and water as the binary solvent, and successfully obtained the pre-condenser of silica sol. The cotton fabrics with the pre-condenser of silica sol, and the effect of finishing parameters was systematically studied on the hydrophobicity of fabrics, especially the correlation between the hydrophobicity and these parameters, including preparation of pre-condenser, addition of silane coupling agents and drying under low temperature. Results show that both rough surface derived from SiO2 nanoparticles on the fabric and hydrophobic aliphatic hydrocarbon chain bound to the fabric surface endows the fabric good hydrophobicity. The optimal parameters used to obtain fabric hydrophobicity in this research is as follows: TEOS(0.1 mol), ethanol(0.9 mol), water(0.8 mol), dipping and rolling with silica sol twice, and dipping and rolling with hexadecyl trimethoxysilane in ethanol. Under such optimal process, the water contact angle of cotton fabric reached to 152.1°, and the mechanical property is also improved.

Key words: silica sol, cotton fabric, polyster fabric, hydrophobicity, hydrophobic finishing, SiO2 nanoparticle

CLC Number: 

  • TS195.5

Tab.1

Effect of pH regulator on water contact angle of fabric"

pH值调节剂 pH值 水接触角/(°)
棉织物 涤纶织物
未整理 0.0 120.4
盐酸 3 130.4 120.9
醋酸 4~5 108.6 119.8
氨水 10~11 116.5 121.6

Tab.2

Effect of counter flow on water contact angle of fabric"

整理方法 水接触角/(°)
棉织物 涤纶织物
未整理 0.0 120.4
未经回流 120.6 121.4
回流 127.0 135.6

Tab.3

Uniform design of silica sol preparation"

试验
序号		 TEOS的
量X1/
mol		 乙醇的
量X2/
mol		 水的量
X3/
mol		 温度
X4/
℃		 时间
X5/
h		 水接触
角Y/
(°)
1 0.025 0.4 0.4 60 8 128.25
2 0.050 0.6 0.7 45 7 142.60
3 0.075 0.8 0.3 65 6 147.88
4 0.100 0.3 0.6 50 5 140.43
5 0.125 0.5 0.2 70 4 134.64
6 0.150 0.7 0.5 55 3 138.74
7 0.175 0.9 0.8 75 9 131.37

Tab.4

Effect of type and dosage of additives on hydrophobicity"

硅烷偶联剂 水接触角/(°)
名称 质量分数/% 棉织物 涤纶织物
2 121.6 118.8
HDTMS 4 133.3 121.5
6 124.0 111.8
8 115.9 116.6
2 — —
DOTMS 4 102.3 108.6
6 127.7 96.0
8 110.1 110.7
2 119.9 118.3
OTES 4 106.7 115.5
6 122.2 101.3
8 108.1 120.6

Tab.5

Effect of one and two step finishing on hydrophobicity"

整理方法 水接触角/(°)
棉织物 涤纶织物
未整理 0.0 120.4
一步法 117.5 121.0
二步法 130.4 123.9

Tab.6

Effect of drying temperature on hydrophobicity and apparent colour"

烘干温度/℃ 水接触角/(°) 表观颜色
55 152.1 正常
75 149.2 正常
95 147.1 发黄
115 131.8 发黄

Fig.1

SEM images of cotton fabrics before (a) and after (b) finishing(×1 000)"

Fig.2

SEM images of PET fabrics before and after finishing. (a) PET fabric (×10 000); (b) SiO2 loaded PET fabric (×5 000)"

Fig.3

FT-IR sepctra of cotton (a) and PET (b) fabrics before and after modification"

Tab.7

Physical and mechanical properties of cotton fabrics before and after modification"

样品名称 白度/% 断裂强力/N 透气性/
(L·m-2·s-1)
经向 纬向
原棉织物 77.1 266 160 3 526.20
SiO2整理棉织物 81.3 298 175 1 620.89
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