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High-transparency hydrophobic self-cleaning MOFs coating and preparation method thereof

A high-transparency, self-cleaning technology, applied in the coating field, can solve the problems of easy-to-wear lubricants, low hysteresis angle, poor mechanical stability, etc., and achieve low refractive index, high light transmittance and good self-cleaning effect Effect

Pending Publication Date: 2022-07-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, water-repellent lubricants have been infused into hydrophilic MOFs to obtain slippery liquid porous surfaces with low hysteresis angle and anti-icing properties, however, such surfaces are prone to loss of lubricant and poor mechanical stability.
[0004] So far, few studies have been reported on transparent hydrophobic self-cleaning MOFs membranes. Therefore, the design and construction of mechanically stable and highly transparent hydrophobic self-cleaning MOFs surfaces still needs further research.

Method used

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  • High-transparency hydrophobic self-cleaning MOFs coating and preparation method thereof
  • High-transparency hydrophobic self-cleaning MOFs coating and preparation method thereof
  • High-transparency hydrophobic self-cleaning MOFs coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Immerse the glass substrate in a n-hexane solution containing 1% 3-aminopropyltriethoxysilane, soak it at 25°C for 2 hours, take out the glass substrate and rinse it with n-hexane, and dry it in a drying oven at 100°C for 1 hour;

[0025] (2) The glass substrate loaded with 3-aminopropyltriethoxysilane was immersed in a 100 mL N,N-dimethylformamide solution hydrothermal reaction kettle containing 5.95 g of tetrafluoroterephthalic acid for a closed reaction at 120 °C for 4 h, Then, it was immersed in 100 mL of N,N-dimethylformamide solution containing 5.83 g of zirconium chloride and reacted at 120° C. for 20 min, ending one cycle. The same procedure was cycled twice, and 2-layer MOFs coatings were prepared on glass substrates.

[0026] (3) The glass substrate with two layers of MOFs coating was immersed in chloroform for 48h, and vacuum-dried at 100°C for 12h to obtain a transparent hydrophobic self-cleaning MOFs coating. The measured average transmittance in the v...

Embodiment 2

[0028] The preparation of 3-aminopropyltriethoxysilane on the glass substrate is the same as that in Example 1.

[0029] (1) The glass substrate attached to 3-aminopropyltriethoxysilane was immersed in 100 mL of N,N-dimethylformamide solution containing 5.95 g of tetrafluoroterephthalic acid in a hydrothermal reaction kettle at 120°C for 4 hours of airtight reaction. Then, it was immersed in 100 mL of N,N-dimethylformamide solution containing 5.83 g of zirconium chloride and reacted at 120° C. for 20 min, ending one cycle. The same procedure was cycled 5 times to prepare 5-layer MOFs coatings on glass substrates.

[0030] (2) The glass substrate with 5 layers of MOFs coating was immersed in chloroform for 48h and vacuum dried at 100°C for 12h to obtain a transparent hydrophobic self-cleaning MOFs coating. The measured average transmittance in the visible light range is as high as 92.26%, the water contact angle is 130°, and the hysteresis angle is 10°.

[0031] It can be obt...

Embodiment 3

[0036] The preparation of 3-aminopropyltriethoxysilane on the glass substrate is the same as that in Example 1.

[0037] (1) The glass substrate attached to 3-aminopropyltriethoxysilane was immersed in a 100 mL N,N-dimethylformamide solution containing 5.95 g of tetrafluoroterephthalic acid in a hydrothermal reaction kettle at 120°C for a closed reaction for 4 hours. Then, it was immersed in 100 mL of N,N-dimethylformamide solution containing 5.83 g of zirconium chloride and reacted at 120° C. for 20 min, ending one cycle. The same procedure was cycled 6 times to prepare 6-layer MOFs coatings on glass substrates.

[0038] (2) The glass substrate with 6 layers of MOFs coating was immersed in chloroform for 48h and vacuum dried at 100°C for 12h to obtain a transparent hydrophobic self-cleaning MOFs coating. The measured average transmittance in the visible light range is as high as 91.26%, the water contact angle is 130°, and the hysteresis angle is 10°.

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Abstract

The invention belongs to the technical field of coatings, and particularly relates to a high-transparency self-cleaning MOFs coating and a preparation method thereof. On a glass substrate modified by 3-aminopropyltriethoxysilane, zirconium chloride and tetrafluoroterephthalic acid are used as raw materials, and a hydrothermal synthesis method is used, so that the hydrophobic self-cleaning transparent MOFs coating is formed on the pre-functionalized glass substrate. By controlling the number of the MOFs coatings, the roughness, mechanical stability and light transmittance of the coatings are balanced best. The highest light transmittance of the prepared coating can reach 92%, the water contact angle is 130 degrees, the water contact angle still keeps a hydrophobic state of 130 degrees after liquid impact, and the MOFs coating has high transparency, firmness and self-cleaning performance and has important significance in application of self-cleaning, antifouling, condensation, anti-icing and the like.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a high-transparency hydrophobic self-cleaning MOFs coating and a preparation method thereof. Background technique [0002] Transparent hydrophobic self-cleaning surfaces have the ability to repel low surface tension liquids and are of great interest in applications such as self-cleaning, antifouling, condensation and ice protection. Harnessing micro-nano-scale roughness while simultaneously achieving robustness, transparency, and hydrophobicity presents great difficulties, as increasing roughness increases liquid repellency but reduces transparency. In addition, in the report of transparent hydrophobic coating, the impact resistance of droplet impact rather than high-speed jet is demonstrated, although it can resist droplet impact but cannot withstand liquid impact, so, the transparent hydrophobic coating with strong micro-nano structure is produced. Layers are extremely challe...

Claims

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Application Information

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IPC IPC(8): C03C17/28
CPCC03C17/28C03C2217/70C03C2218/111C03C2218/31C03C2218/32
Inventor 陈若愚董馨贾倩王红宁刘小华
Owner CHANGZHOU UNIV
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