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Preparation method for super hydrophobic biodegradable compound film and product thereof

A composite film and super-hydrophobic technology, applied in coatings, polyester coatings, etc., can solve the problems of easy erosion of organic solvents and difficulty in spreading organic coatings, and achieve the effect of easy industrialization, no need for equipment, and elimination of erosion

Inactive Publication Date: 2012-04-11
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to further form micro-nano secondary rough structures on the surface of biodegradable materials is also a challenge. If the substrate is hydrophilic such as starch, fiber or chitosan, it is difficult to spread the organic coating; if the substrate is aliphatic Polyester, organic solvents are prone to corrosion

Method used

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  • Preparation method for super hydrophobic biodegradable compound film and product thereof
  • Preparation method for super hydrophobic biodegradable compound film and product thereof
  • Preparation method for super hydrophobic biodegradable compound film and product thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1: Dissolve 1.5g of polylactic acid (NatureWork LLC, 3051D, USA) in 60g of chloroform at 60°C, stir to form a transparent solution, and then add 0.8g of hydrophobic dioxide with an average particle size of 18nm. Silicon (Evonik Degussa, R972) was stirred for 2 hours and cooled to room temperature to obtain a uniformly dispersed mixture.

Embodiment 2

[0024] Example 2: Dissolve 1.5g of polylactic acid (NatureWork LLC, 3051D, USA) in 60g of chloroform at 60°C, stir to form a transparent solution, and then add 0.5g of hydrophobic dioxide with an average particle size of 18nm. Silicon (Evonik Degussa, R972) was stirred for 2 hours and cooled to room temperature to obtain a uniformly dispersed mixture.

Embodiment 3

[0025]Example 3: Dissolve 1.5g of polylactic acid (NatureWork LLC, 3051D, USA) in 50g of chloroform at 60°C, stir to form a transparent solution, and then add 0.8g of hydrophobic dioxide with an average particle size of 18nm Silicon (Evonik Degussa, R972) was stirred for 2 hours and cooled to room temperature to obtain a uniformly dispersed mixture.

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Abstract

The invention discloses a preparation method for super hydrophobic biodegradable compound film and a product thereof. Under a certain temperature, hydrophobic inorganic nano particles are added into transparent aliphatic biodegradable polyester liquid and stirred to form a mixed liquid dispersed uniformly. A dip-coating method is used for coating the mixed liquid on a certain substrate material and the volatizing speed of a solvent is adjusted by controlling the temperature rising speed to a certain temperature and then the temperature is kept constant for a certain period of time; then the mixed liquid is dried to obtain the super hydrophobic biodegradable compound film with a special micro-nano structure. The compound film is a compound film with a structure-controllable microporous network micro-nano secondary microscopic surface. The static contact angle between film and water is 155-164 degrees; moreover, the contact angle hysteresis of drops on the surface of the film is less than 5 degrees. A super hydrophobic coating formed by coating the super hydrophobic biodegradable compound film on the surface of a starch base biodegradable material can greatly reduce the hygroscopy of the starch base biodegradable material.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophobic biodegradable composite film and a product thereof. Background technique [0002] Superhydrophobic surfaces generally refer to surfaces with a contact angle with water greater than 150°. This type of material has very broad application prospects in industrial and agricultural production and people's daily life. A large number of studies have shown that two methods are generally used to prepare superhydrophobic surfaces, one is to modify low surface energy substances on rough surfaces, and the other is to construct rough structures on hydrophobic surfaces. The preparation methods of superhydrophobic surfaces mainly include template method, sol-gel method, phase separation method, electrospinning method, etching, self-assembly and other methods. [0003] In recent years, there have been patents and literature reports on the formation of superhydrophobic films on the surface of substrate...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08J9/28C08J5/18C08L67/04C08L3/02C09D167/00C09D167/04C09D167/02C09D7/12C03C17/32
Inventor 童跃进叶文波关怀民黄世俊张志建
Owner FUJIAN NORMAL UNIV
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