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Self-cleaning plastic film with lotus leaf structure, surface microstructure and preparation method thereof

A micro-structure, self-cleaning technology, applied in coating and other directions, can solve the problems of unable to achieve self-cleaning function, affecting the self-cleaning function of finished products, complex processing procedures, etc.

Active Publication Date: 2016-06-29
THE HONG KONG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods are either complicated in processing procedures, or cannot achieve the desired effect of self-cleaning function, thus affecting the self-cleaning function of finished products

Method used

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  • Self-cleaning plastic film with lotus leaf structure, surface microstructure and preparation method thereof
  • Self-cleaning plastic film with lotus leaf structure, surface microstructure and preparation method thereof
  • Self-cleaning plastic film with lotus leaf structure, surface microstructure and preparation method thereof

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Embodiment Construction

[0029] In nature, such as figure 1 As shown, the surface of lotus leaf has a unique self-cleaning function, which is determined by its surface microstructure and chemical substances containing low surface energy. We use scanning electron microscopy to observe the surface of lotus leaf. Such as figure 2 As shown, it can be found that the surface of the lotus leaf has microstructures arranged in a certain order. image 3 is a schematic diagram of the contact angle between the surface microstructure of the lotus leaf and the water droplet, such as Figure 4 It is the effect diagram of the application of microstructures with hydrophobic or self-cleaning functions on different materials, from left to right are the effects obtained on glass materials, ceramic materials and metal materials.

[0030] Water droplets have different contact angles on microstructures of different materials, such as Figure 5 As shown, the schematic diagram of the hydrophilic effect of water droplets u...

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Abstract

The invention discloses preparation methods for a lotus-leaf structured self-cleaning plastic film and lotus-leaf structured self-cleaning surface microstructures. The preparation methods comprise the steps of 1) preparing a mold core by using a single-point diamond processing technology; and 2) preparing a micro-surface type with submicron scale surface shape accuracy and nanoscale surface roughness by injecting on a plastic with the mold core, so as to make grooves with surfaces arranged neatly or staggeredly, so that contact angles between water drops and contact surfaces are over 90 degrees. The invention also discloses a preparation method for the lotus-leaf structured self-cleaning surface microstructures. The plastic film with lotus-leaf structured surface microstructures can be prepared by using ultraprecise single-point diamond processing technology. The plastic film has a self-cleaning function and wide applications. Besides, with the above mold core, common plastics can be made into plastic products with the self-cleaning function rapidly, thereby greatly increasing production efficiency.

Description

technical field [0001] The invention relates to a preparation method of a plastic film and a surface microstructure, in particular to a self-cleaning plastic film with a lotus leaf structure and a preparation method of a surface microstructure. Background technique [0002] At present, the existing methods for obtaining the self-cleaning function of the surface structure of the lotus leaf mainly include the method of preparing the surface microstructure by EDM (abbreviation of Electrical Discharge Machining, that is, electric discharge machining), femtosecond laser engraving and molding method, and special film layer method. For another example, the patent titled as a preparation method of lotus-leaf non-stick cookware (CN101396229A) uses surface sandblasting to generate a structured surface with a self-cleaning function. The above methods either have complicated processing procedures, or cannot achieve the ideal self-cleaning effect, thereby affecting the self-cleaning func...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/00B29C33/76
Inventor 杜雪李荣彬王文奎张家儁
Owner THE HONG KONG POLYTECHNIC UNIV
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