Preparation method and application method of super-hydrophobic antibacterial magnesium oxychloride powder coating

A technology of powder coating and application method, applied in the direction of powder coating, coating, cement coating, etc., can solve the problems of reducing the antibacterial performance of materials, toxic environment, pollution, etc., achieve long-term effective antibacterial performance, avoid pollution, and inhibit hygroscopicity Effect

Active Publication Date: 2021-06-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the existing inventions to prepare superhydrophobic coatings require the use of volatile superhydrophobic solvents, which are usually toxic and pollute the environment
The price of micro-nano materials used to provide surface roughness is more expensive than magnesium oxychloride cement materials
Antibacterial coatings made of existing quaternary ammonium antibacterial agents have certain hygroscopicity and electropositive properties, making bacteria easy to adhere to the surface and reducing the antibacterial performance of the material

Method used

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  • Preparation method and application method of super-hydrophobic antibacterial magnesium oxychloride powder coating
  • Preparation method and application method of super-hydrophobic antibacterial magnesium oxychloride powder coating
  • Preparation method and application method of super-hydrophobic antibacterial magnesium oxychloride powder coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: Preparation of superhydrophobic antibacterial magnesium oxychloride powder coating

[0039] Material:

[0040] Light-burned magnesia: MgO, activity 61.2%, Shanghai Qiren Chemical Co., Ltd.; hydroxyl-terminated polydimethylsiloxane (PDMS): viscosity 10000cP, Dow Corning Company; tetraethyl orthosilicate (TEOS): analytically pure, Tianjin Bodie Chemical Co., Ltd.; dibutyltin dilaurate (DD): analytically pure, Siping Fine Chemicals Co., Ltd.; magnesium chloride hexahydrate (MgCl 2 ·6H 2 O): analytically pure, Chengdu Kelong Chemicals Co., Ltd.; Dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride (QAS): analytically pure, Dow Corning; used in experiments Water was deionized water made in the laboratory.

[0041] Preparation:

[0042] (1) According to the molar ratio MgO:MgCl 2 ·6H 2 O:H 2O=7.56:1:7.51 Add MgO and MgCl to the JJ-5 planetary mortar mixer 2 ·6H 2 O and H 2 O, stirred rapidly for 10 minutes to obtain MOC cement matrix slurry...

Embodiment 2

[0046] Embodiment 2: Characterization of superhydrophobic antibacterial magnesium oxychloride powder coating

[0047] figure 1 It is the SEM figure of the superhydrophobic antibacterial magnesium oxychloride powder coating prepared in embodiment 1, figure 2 It is the particle surface morphology figure of the superhydrophobic antibacterial magnesium oxychloride powder coating prepared in embodiment 1, as can be seen from the SEM figure, the magnesium oxychloride powder particle size after grinding comprises nanometer to submillimeter level, and particle surface is microcosmic rough structure. When used as a coating, a sieve can be used as needed to select the powder of the required size.

Embodiment 3

[0048] Embodiment 3: the application of superhydrophobic antibacterial magnesium oxychloride powder coating on metal steel plate

[0049] Coating powder: superhydrophobic / antibacterial magnesium oxychloride powder prepared in Example 1.

[0050] Application of superhydrophobic antibacterial magnesium oxychloride powder coating on metal steel plates:

[0051] 1. Metal substrate pretreatment: Use a sandblasting machine to sandblast the surface of the metal plate (50*50mm), then place the metal plate in an ethanol solution for ultrasonic cleaning, remove grease and stains on the surface of the metal plate, and place Heating in an oven at 150°C for standby;

[0052] 2. Coating preparation: evenly spread a layer of strong adhesive on the metal plate, and then spray the powder evenly on the surface of the metal plate with a powder sprayer.

[0053] Coating performance test:

[0054] (1) Superhydrophobic performance test: use a contact angle meter to measure the contact angle of w...

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Abstract

The invention discloses a preparation method and an application method of a super-hydrophobic antibacterial magnesium oxychloride powder coating. The method comprises the following steps: grafting hydrophobic hydroxyl-terminated polydimethylsiloxane and dimethyl octadecyl [3-trimethoxysilylpropyl] ammonium chloride with an antibacterial property onto a crystal of magnesium oxychloride cement through tetraethoxysilane, grinding modified magnesium oxychloride cement into powder, and finally bonding the modified magnesium oxychloride cement powder on the surface of a to-be-modified object by using a binder so as to prepare the super-hydrophobic antibacterial magnesium oxychloride powder coating with excellent performance. No volatile organic solvent exists in the whole preparation process of the coating, environmental pollution is avoided, the prepared coating has the good super-hydrophobic characteristic, the contact angle of water drops on the surface of the coating is larger than 150 degrees, the rolling angle is smaller than 10 degrees, adhesion of bacteria is effectively weakened due to the excellent super-hydrophobic characteristic of the coating, the antibacterial performance is long-acting, the surface of the coating is of a rough structure, after abrasive paper polishing, the super-hydrophobic and antibacterial properties can still be kept, the wear-resisting property is remarkable, and the application prospect is wide.

Description

technical field [0001] The invention relates to the field of preparation of magnesium oxychloride powder coatings, in particular to a preparation and application method of superhydrophobic antibacterial magnesium oxychloride powder coatings. Background technique [0002] Inspired by the hydrophobic effect of lotus leaves, the study of superhydrophobic materials with contact angles greater than 150° with water droplets has attracted extensive attention. The typical characteristics of superhydrophobic materials are: water droplets or droplets with water as a solvent are nearly spherical on the surface of superhydrophobic materials, and it is difficult for the droplets to stay stably on the surface of the material. It will roll off and remove pollutants such as floating ash on the surface of the material, which shows a self-cleaning phenomenon. Quaternary ammonium compounds are widely used to make antibacterial materials, but due to their own hygroscopicity and positive charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/08C09D5/14C09D5/03C09D7/63C09D7/65
CPCC09D1/08C09D5/14C09D5/033
Inventor 张爱民李科王源升
Owner SICHUAN UNIV
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