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A kind of raspberry-like microsphere, superhydrophobic coating and preparation method thereof

A super-hydrophobic coating and raspberry-like technology, which is applied in the synthesis field of raspberry-like polymethyl methacrylate/silica composite materials, can solve the problem that the size of super-hydrophobic composite particles is difficult to control, difficult to apply, and limited etc. to achieve good chemical stability, controllable size and simple preparation method

Active Publication Date: 2020-08-07
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the current organic-inorganic composite materials are simply organic-inorganic blends, the prepared core / shell structure composite materials are mainly concentrated in the technical field with inorganic materials as the core and organic materials as the shell, and the prepared superhydrophobic composite particles exist The size is difficult to control, and it is difficult to apply to surfaces such as glass, textiles, and metals, which limits the application of organic-inorganic composite materials in superhydrophobic coatings

Method used

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  • A kind of raspberry-like microsphere, superhydrophobic coating and preparation method thereof
  • A kind of raspberry-like microsphere, superhydrophobic coating and preparation method thereof
  • A kind of raspberry-like microsphere, superhydrophobic coating and preparation method thereof

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Embodiment 1

[0031] a. Synthesis of polymethyl methacrylate microspheres

[0032] Disperse 3.5g of polyvinylpyrrolidone in methanol / water (70ml / 30ml) solvent, blow nitrogen gas for 30min to remove oxygen, heat at 55°C and stir for 3h. A mixture of 9.5 g of methyl methacrylate and 0.1 g of azobisisobutyronitrile was added dropwise to the polyvinylpyrrolidone dispersion. Slowly raise the temperature to 70°C, react for 24 hours, centrifuge, wash, and dry at 60°C for 12 hours to obtain polymethylmethacrylate microspheres.

[0033] b. Synthesis and hydrophobic treatment of raspberry-like PMMA / silica composite microspheres

[0034] Take 7.9 g of polymethyl methacrylate microspheres synthesized in a above, add tetraethyl orthosilicate ethanol solution (tetraethyl orthosilicate 0.0018 g, ethanol 90 ml), add ammonia water to adjust the pH value to 11.3, and react at room temperature 12h, synthesize raspberry-like polymethylmethacrylate / silica composite microspheres. At the same time, the polymet...

Embodiment 2

[0038] a. Synthesis of polymethyl methacrylate microspheres

[0039] Disperse 3.5g of polyvinylpyrrolidone in methanol / water (70ml / 30ml) solvent, blow nitrogen gas for 30min to remove oxygen, heat and stir at 60°C for 3h. A mixture of 10 g of methyl methacrylate and 0.4 g of azobisisobutyronitrile was added dropwise to the polyvinylpyrrolidone dispersion. Slowly raise the temperature to 70°C, react for 24 hours, centrifuge, wash, and dry at 60°C for 12 hours to obtain polymethylmethacrylate microspheres.

[0040] b. Synthesis and hydrophobic treatment of raspberry-like PMMA / silica composite microspheres

[0041] Take 8.5 g of polymethyl methacrylate microspheres synthesized in a above, add tetraethyl orthosilicate ethanol solution (tetraethyl orthosilicate 0.0018g, ethanol 90ml), add ammonia water to adjust the pH value to 11.3, and react at room temperature 12h, synthesize raspberry-like polymethylmethacrylate / silica composite microspheres. At the same time, the polymethyl...

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Abstract

The invention discloses a raspberry-like shaped microsphere, a super-hydrophobic coating and preparation methods thereof. The preparation method comprises the following steps: (1) synthesizing a polymethyl methacrylate microsphere through a dispersion polymerization method; (2) taking the polymethyl methacrylate microsphere, adding an ethanol solution of tetraethoxysilane as a silicon dioxide precursor, adopting a sol-gel process to react, and synthesizing the raspberry-like shaped microsphere which takes polymethyl methacrylate as a core and takes silicon dioxide as a shell. The preparation method is simple, the prepared raspberry-like shaped microsphere is controllable in dimension, and the super-hydrophobic coating has very good chemical stability, very good acid and alkaline resistanceand a very good hydrophobic property, has a surface contact angle of 151 degrees, and can be used for glass, building outer walls, fabric surfaces, metal surfaces and the like.

Description

technical field [0001] The invention relates to the technical field of organic / inorganic composite superhydrophobic materials, in particular to a synthesis method of a raspberry-like polymethyl methacrylate / silicon dioxide composite material and its application in superhydrophobic coatings. Background technique [0002] The wettability of solid surfaces is an important property of materials. Materials with superhydrophobic properties can be applied to anti-fouling, anti-fog of optical lenses, self-cleaning of buildings, oil-water separation, etc. A surface with a surface contact angle greater than 150° is a superhydrophobic surface. Generally speaking, the preparation of superhydrophobic surfaces needs to meet two conditions: one is that the surface of the material is modified with low surface energy substances; the other is that the surface of the material has a micro-nano hierarchical structure. [0003] At present, organic / inorganic composite materials have been prepared...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/06C08F271/02C08F220/14C09D183/04C09D7/65C09D7/62
CPCB01J13/06C08F271/02C09D183/04C08F220/14C08L51/003C08K9/06C08K3/36
Inventor 王斌苏琴琴梁彩珍程菲冯颖
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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