Fluorine-free superhydrophobic finishing agent containing modified nano silicon dioxide hydrosol and application thereof

A nano-silica, hydrosol technology, applied in inorganic chemistry, fiber processing, silicon compounds, etc., can solve the problems of less research on textile functional finishing, high cost of organic solvents, cumbersome processes, etc. The effect of improving fiber surface roughness and broad application prospects

Active Publication Date: 2011-04-20
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is relatively cumbersome, and a large amount of organic solvents such as ethanol are usually required as the reaction medium in the preparation process to promote the homogeneous hydrolysis reaction of the precursor
However, organic solvents are expensive, flammable, and polluting to a certain extent.
Therefore, in recent years, many studies have begun to use the hydrosol method to prepare nano-SiO 2 , but less research has been done on the functional finishing of textiles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix 2g of methyltrimethoxysilane, 0.19g (0.8CMC) sodium lauryl sulfate and 100g of water, stir vigorously at 25°C for 1h, slowly add 3mL of catalytic ammonia water dropwise, stir for 3h, then add 2g of dodecyl sulfate Alkyltrimethoxysilane, continue to stir for 3h to obtain modified SiO 2 Hydrosol.

[0028] Modified SiO 2 Super water-repellent finishing of pure cotton plain woven fabric with hydrosol, impregnating the fabric with modified SiO 2 Hydrosol 20min→two dipping and two rolling (rolling rate 70%~80%)→drying at 80°C for 5min→baking at 120°C for 90min.

[0029] Use the OCA40 video contact angle measuring instrument to test the contact angle. The water volume is 5 μL, and the reading is taken after the water drop contacts the fabric for 60 seconds. It is measured 5 times at different positions of the same sample, and the average value is taken. The moisture resistance of the fabric surface is tested according to AATCC 22-2005 "Water Repellency: Spray Test". Th...

Embodiment 2

[0031] Mix 3g of tetramethoxysilane, 0.38g (1.0CMC) sodium dodecylsulfonate and 100g of water, stir vigorously at 40°C for 1h, slowly add 2mL of catalytic ammonia water dropwise, stir for 4h, then add 2g of hexadecane Alkyltrimethoxysilane, continue to stir for 5h to obtain modified SiO 2 Hydrosol.

[0032] Modified SiO 2 Super water-repellent finishing of polyester twill woven fabric with hydrosol, impregnating the fabric with modified SiO 2 Hydrosol for 30 minutes→two dipping and two rolling (rolling rate 60%~70%)→drying at 85°C for 5 minutes→baking at 140°C for 60 minutes.

[0033] Use the OCA40 video contact angle measuring instrument to test the contact angle. The water volume is 5 μL, and the reading is taken after the water drop contacts the fabric for 60 seconds. It is measured 5 times at different positions of the same sample, and the average value is taken. The moisture resistance of the fabric surface is tested according to AATCC 22-2005 "Water Repellency: Spray ...

Embodiment 3

[0035] Mix 3g tetraethoxysilane, 0.05g (1.2CMC) sodium dodecylbenzenesulfonate and 100g water, stir vigorously at 30°C for 2h, slowly add 3mL catalyst ammonia water dropwise, stir for 3h, then add 4g Hexaalkyltrimethoxysilane, continue to stir for 5h to obtain modified SiO 2 Hydrosol.

[0036] Modified SiO 2 Super water-repellent finishing of pure cotton twill woven fabric with hydrosol, impregnating the fabric with modified SiO 2Hydrosol 20min→two dipping and two rolling (rolling rate 70%~80%)→drying at 90°C for 5min→baking at 130°C for 90min.

[0037] Use the OCA40 video contact angle measuring instrument to test the contact angle. The water volume is 5 μL, and the reading is taken after the water drop contacts the fabric for 60 seconds. It is measured 5 times at different positions of the same sample, and the average value is taken. The moisture resistance of the fabric surface is tested according to AATCC 22-2005 "Water Repellency: Spray Test". The measured contact ang...

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PUM

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Abstract

The invention relates to a fluorine-free superhydrophobic finishing agent containing modified nano silicon dioxide hydrosol and application thereof. The finishing agent is prepared by the following steps of: (1) mixing a precursor, an anionic surfactant and water and stirring violently at the temperature of between 20 and 50 DEG C; and (2) slowly adding ammonia water serving as a catalyst dropwise, stirring, adding long-chain alkylsiloxane serving as a modifier and stirring continually so as to obtain modified SiO2 hydrosol. The finishing agent has a stable property, avoids the pollution of an organic solvent and has high water repellency when used for performing superhydrophobic finishing on textiles.

Description

technical field [0001] The invention belongs to the field of nano-silica hydrosol fluorine-free super water-repellent finishing agent and its application field, in particular to a modified nano-silica hydrosol fluorine-free super water-repellent finishing agent and its application. Background technique [0002] The super water-repellent surface usually refers to the static contact angle between the solid surface and water greater than 150°. Whether it can achieve super water repellency is determined by the chemical composition and microstructure of the solid surface. It is used in many fields such as scientific research, industrial and agricultural production, and daily life. It has broad application prospects. With the rapid development of science and technology, super water-repellent functional textiles are increasingly favored by people for their unique self-cleaning and anti-pollution properties. Super water-repellent textiles can be widely used in clothing for medical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79C01B33/141D06M101/06D06M101/12D06M101/32D06M101/34
Inventor 蔡再生徐丽慧庄伟程德亮
Owner DONGHUA UNIV
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