Functional fluorine-containing microsphere and self-cleaning surface built by same

A technology of microspheres and surface grafting, applied in the direction of coating, etc., can solve the problems of poor adhesion, expensive and toxic fluorine-containing solvents, etc.

Inactive Publication Date: 2012-07-18
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fluorine-containing nano-microspheres in this patent need to be dispersed in a fluorine-containing solvent, and there are no adhesive groups on the surface, so the adhesion is not very strong
[0013] In short, although the current international articles and patents mention that super-amphiphobic materials have excellent properties, there are no real large-scale industrial products in related fields, mainly because some problems in industrial applications have not been solved: (1) fluorine-containing Dispersion of microspheres: Due to the low surface energy of fluoropolymers, it is difficult to dissolve in most non-fluorinated solvents, so it is necessary to use fluorine-containing solvents to realize the dispersion of fluorine-containing nano-microspheres
However, fluorine-containing solvents are not only expensive, but also toxic, which is not conducive to construction and environmental protection.
(2) Adhesiveness of fluorine-containing microspheres: The surface of the super-amphiphobic nano-microspheres prepared in the current reported patents and literatures are all fluorine-containing polymers, without adhesive functional groups, so the prepared super-amphiphobic nanospheres The hydrophobic nano-microspheres have the disadvantage of poor adhesion

Method used

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  • Functional fluorine-containing microsphere and self-cleaning surface built by same
  • Functional fluorine-containing microsphere and self-cleaning surface built by same
  • Functional fluorine-containing microsphere and self-cleaning surface built by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Preparation of Silica Microspheres Containing Hydroxyl on Surface

[0083] Add 100ml of absolute ethanol, 2ml of deionized water and 4ml of ammonia water into a 100ml round-bottomed flask, then dropwise add 3.5ml of tetraethyl orthosilicate, react at 25°C for 24 hours, and centrifuge and wash the product three times with absolute ethanol to obtain The silicon dioxide microspheres were freeze-dried in a vacuum, and the particle size of the finally obtained silicon dioxide microspheres was 160±5nm.

Embodiment 2

[0085] Preparation of Silica Microspheres Containing Amino Groups on the Surface

[0086] Add 100ml of absolute ethanol, 4ml of deionized water and 3ml of ammonia water into a 100ml round-bottomed flask, then dropwise add 4ml of tetraethyl orthosilicate, react at 25°C for 24 hours, and centrifuge and wash the product three times with absolute ethanol to obtain The silica microspheres were freeze-dried in a vacuum, and the finally obtained silica microspheres had a particle size of 91±4nm.

[0087] Disperse 2g of 90nm silicon dioxide in 60ml of anhydrous toluene, add 5ml of aminopropyltriethoxysilane, reflux at 105°C for 48h after filling with nitrogen, then wash with anhydrous toluene and anhydrous acetone in turn, and vacuum dry. Aminated silicon dioxide was obtained, the particle size of which was 365nm±5nm.

Embodiment 3

[0089] Preparation of polymer microspheres with hydroxyl groups on the surface

[0090] Under stirring, gradually add 100 milliliters of distilled water, the mixture of 5.80 grams of methyl methacrylate and 0.6 gram of ethylene glycol dimethacrylate in a 500 milliliter three-necked flask, and 41 milligrams of potassium peroxodisulfate aqueous solution (5 milliliters) . Nitrogen was blown through the reaction system at 25°C for 15 minutes to remove oxygen in the system. Then it was heated to 90° C. in an oil bath and reacted for 4 hours.

[0091] 43 ml of the solution was taken out from the above system, added to a 250 ml three-necked flask filled with nitrogen, and 0.6 ml of tetrahydrofuran solution in which 1.4 mg of azobisisobutyronitrile was dissolved was added. After stirring for 15 minutes at 25°C, it was heated to 90°C. Subsequently, a mixed solution containing 0.56 g of ethylene glycol diester 2-chloropropionate, 40 microliters of ethylene glycol dimethacrylate and 0...

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Abstract

The invention discloses a functional fluorine-containing microsphere and a self-cleaning surface built by the same. The high-dispersibility high-adhesion fluorine-containing microsphere disclosed by the invention is prepared by using the following method steps: reacting microspheres and a base amine catalyst with alpha-halogenated acyl bromide or alpha-halogenated acyl chloride to obtain a microsphere the surface of which is grafted with ATRP (atom transfer radical polymerization) initiator; carrying out ATRP random copolymerization or segmented polymerization reaction on the microsphere the surface of which is grafted with ATRP initiator, a monomer F and a monomer D so as to obtain a monomer D polymer microsphere, wherein the surface of the monomer D polymer microsphere is grafted with the monomer F and can perform D-A reaction; and reacting the monomer D polymer microsphere with an epoxy resin type polymer the terminal group of which is a compound A to obtain the fluorine-containingmicrosphere having high dispersibility and high adhesion. The self-cleaning surface disclosed by the invention is obtained by dissolving the fluorine-containing microsphere having high dispersibilityand high adhesion into a low-boiling-point solvent, then adding an epoxy resin solidifying agent E for evenly mixing and spraying a mixture on the surface of a substrate material and drying in vacuum. According to the invention, the use of a fluorine-containing solvent is avoided in the self-cleaning surface, and the obtained self-cleaning surface has strong adhesion on the surface of the substrate material.

Description

technical field [0001] The invention belongs to the field of macromolecular superamphiphobic materials, and in particular relates to a functional fluorine-containing microsphere with high dispersibility and cohesiveness and a preparation method thereof, and a self-cleaning functional surface constructed by the fluorine-containing microsphere. Background technique [0002] Superhydrophobic surfaces refer to those solid surfaces with surface static contact angles greater than 150°. This special hydrophobic state (property) is called superhydrophobic state (property). If the static contact angles of water and oil on a surface are both greater than 150° and the rolling angles are both less than 5°, the interface can be called a superamphiphobic interface. [0003] Superamphiphobic materials can be widely used in all aspects of production and life such as building materials, electricity, military, textiles, leather, packaging materials, kitchen and bathroom utensils, oil pipelin...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F292/00C08F265/04C08F293/00C09D187/00C09D7/12C09D5/00
Inventor 胡继文邹海良张干伟候成敏何谷平李银辉涂园园刘国军胡攸卢汝烽李伟刘锋
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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