Functional fluorine-containing microsphere and self-cleaning surface built by same
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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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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-fluorin
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[0081] Example 1
[0082] Preparation of silica microspheres containing hydroxyl groups on the surface
[0083] Add 100ml of absolute ethanol, 2ml of deionized water and 4ml of ammonia to a 100ml round bottom flask, and then add 3.5ml of tetraethyl orthosilicate dropwise. After reaction at 25°C for 24, the product is centrifuged and washed with absolute ethanol three times to obtain The silica microspheres are freeze-vacuum dried, and the particle size of the finally obtained silica microspheres is 160±5nm.
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[0084] Example 2
[0085] Preparation of silica microspheres with amino groups on the surface
[0086] Add 100ml of absolute ethanol, 4ml of deionized water and 3ml of ammonia to a 100ml round bottom flask, and then add 4ml of tetraethylorthosilicate dropwise. After reacting for 24 at 25°C, the product is centrifuged and washed three times with absolute ethanol. The silica microspheres were freeze-vacuum dried, and the particle size of the finally obtained silica microspheres was 91±4nm.
[0087] Disperse 2g of 90nm silica in 60ml of anhydrous toluene, add 5ml of aminopropyltriethoxysilane, fill with nitrogen and reflux at 105°C for 48h, then wash with anhydrous toluene, anhydrous acetone, and vacuum dry. The aminated silica has a particle size of 365nm±5nm.
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[0088] Example 3
[0089] Preparation of polymer microspheres containing hydroxyl groups on the surface
[0090] Under stirring, gradually add 100 ml of distilled water, 5.80 g of methyl methacrylate and 0.6 g of ethylene glycol dimethacrylate in a 500 ml three-necked flask, and 41 mg of potassium peroxodisulfate aqueous solution (5 ml) . The reaction system was bubbled with nitrogen 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] Take out 43 ml of the solution from the above system, add it to a 250 ml three-necked flask filled with nitrogen, and add 0.6 ml of a tetrahydrofuran solution containing 1.4 mg of azobisisobutyronitrile. Stir at 25°C for 15 minutes and then heat to 90°C. Subsequently, a mixture containing 0.56 g of ethylene glycol diester of 2-chloropropionate, 40 microliters of ethylene glycol dimethacrylate and 0.57 g of methyl methacrylate was slowly added. After the addition, the rea...
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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...
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