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Organic-inorganic nanocomposite coating material and preparation method thereof

A composite coating, inorganic nano technology, applied in coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve the problems of weakening the durability of concrete, affecting the overall performance of composite materials, uneven mixing process, etc., to reduce Porosity, improved air permeability resistance, good dispersion effect

Inactive Publication Date: 2021-07-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary epoxy has a high viscosity and cannot penetrate into the interior of the concrete to fill the pores, resulting in a decrease in the interface bonding force. At the same time, when the epoxy resin is modified by clay layered materials, agglomeration will occur, which will make the mixing process uneven and produce Many large air bubbles affect the overall performance of the composite material and weaken its durable protection against concrete

Method used

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  • Organic-inorganic nanocomposite coating material and preparation method thereof
  • Organic-inorganic nanocomposite coating material and preparation method thereof
  • Organic-inorganic nanocomposite coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of nanoscale layered kaolin:

[0038] Step 1) Take 20 g of kaolin raw soil and add it to hydrochloric acid, the concentration of hydrochloric acid is 5mol / L, the concentration of inorganic kaolin in hydrochloric acid is 0.1g / ml, acidify at 60°C for 6h, collect the acidified kaolin and wash with water until neutral, then Drying under vacuum drying conditions at 60° C. to obtain acidified inorganic kaolin.

[0039] Step 2) Add dimethyl sulfoxide and acidified inorganic kaolin into the sand mill, the mass volume ratio of the acidified inorganic kaolin to dimethyl sulfoxide is 0.05:1g / mL, at a speed of 2000r / mL Mix the reaction solution with ethanol, the amount of ethanol added is 50% of the volume of the reaction solution, centrifuge at 4000r / min for 3 minutes to collect the product, and obtain nano-kaolin (nano-layered kaolin).

[0040] 2. Preparation of nano-kaolin / permeable epoxy resin composite anti-corrosion coating:

[0041] Step 1) Take 80 parts of ...

Embodiment 2

[0044] 1. Preparation of nanoscale layered kaolin:

[0045] Step 1) Take 30 g of kaolin raw soil and add it to hydrochloric acid, the concentration of hydrochloric acid is 4mol / L, the concentration of inorganic kaolin in hydrochloric acid is 0.2g / ml, acidify at 65°C for 6.5h, collect the acidified kaolin and wash with water until neutral, Then dry it under the condition of vacuum drying at 65° C. to obtain the acidified inorganic kaolin.

[0046]Step 2) Add dimethyl sulfoxide and acidified inorganic kaolin into the sand mill, the mass volume ratio of the acidified inorganic kaolin to dimethyl sulfoxide is 0.1:1g / mL, at a speed of 2500r / mL Mix the reaction solution with ethanol, the amount of ethanol added is 60% of the volume of the reaction solution, centrifuge at 5000r / min for 5min to collect the product, which is nano kaolin (nano layered kaolin).

[0047] 2. Preparation of nano-kaolin / permeable epoxy resin composite anti-corrosion coating:

[0048] Step 1) Take 85 parts ...

Embodiment 3

[0051] 1. Preparation of nanoscale layered kaolin:

[0052] Step 1) Take 40 g of kaolin raw soil and add it to hydrochloric acid, the concentration of hydrochloric acid is 5 mol / L, the concentration of inorganic kaolin in hydrochloric acid is 0.2 g / ml, acidify at 70 ° C for 7 hours, collect the acidified kaolin and wash it with water until it is close to neutral, Then dry it under the condition of vacuum drying at 70° C. to obtain the acidified inorganic kaolin.

[0053] Step 2) adding formamide and acidified inorganic kaolin into a sand mill, the mass volume ratio of the acidified inorganic kaolin to formamide is 0.15:1g / mL, stirring and reacting at a speed of 3000r / min for 6h, Obtain a reaction solution; mix the reaction solution with ethanol, the amount of ethanol added is 60% of the volume of the reaction solution, centrifuge at 4500r / min for 4min to collect the product, which is nano-kaolin (nano-layered kaolin).

[0054] 2. Preparation of nano-kaolin / permeable epoxy res...

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Abstract

The invention discloses an organic-inorganic nanocomposite coating material and a preparation method thereof. The method comprises the following steps: mixing permeable epoxy resin and nano kaolin, carrying out stirring, and performing uniform dispersing to obtain a coating mother solution; and mixing the coating mother solution with a curing agent, and conducting stirring to obtain a coating material. According to the method, nanoscale kaolin with a high specific surface area and low thickness is prepared in an acidification ball-milling ultrasonic treatment mode; the nanoscale kaolin is compounded with high-permeability epoxy resin to prepare a gas-permeation-resistant coating material, the surface of concrete is coated with the coating material, and an organic permeation epoxy part in the coating can permeate into the concrete so as to reduce the porosity of the concrete; and inorganic lamellar kaolin can be uniformly dispersed in the organic permeable epoxy, and forms a compact inorganic protective layer on the surface of the concrete along with the permeation of epoxy, so the gas permeation resistance of the concrete is improved, and the durability of the concrete is effectively improved. The method is simple in process, and the prepared coating material is high in adhesive force to concrete and good in corrosion resistance.

Description

technical field [0001] The invention belongs to the field of anti-corrosion coatings, and in particular relates to an organic-inorganic nanocomposite coating material and a preparation method thereof. Background technique [0002] Concrete is one of the most basic construction materials used in the construction of buildings, roads and bridges, industrial facilities, and artificial islands. Concrete durability failure has always been an important problem in the development of the concrete industry, and many major concrete projects have high requirements for the design service life. Under harsh environmental conditions, even though many concrete projects have been designed for durability, various problems still appear before the design period of use, which in turn leads to huge maintenance costs, and even causes major safety problems, resulting in severe influences. The durability failure process of concrete is similar to the failure mechanism of porous materials. Water, car...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D7/62C09D5/08
CPCC08K2201/011C09D5/08C09D163/00C09D7/62C08K9/02C08K3/346
Inventor 韦江雄罗顺杰陈阳徐畏婷黄浩良余其俊
Owner SOUTH CHINA UNIV OF TECH