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Hole sealing moisture-proof anticorrosive composite coating material and its prepn process

A composite coating and sealing material technology, which is applied in the field of new moisture-proof composite coating materials, can solve problems such as easy cracking, poor substrate bonding strength, and poor rain erosion resistance, so as to improve strength and cohesion, and improve moisture-proof and anti-corrosion performance , the effect of dense structure

Inactive Publication Date: 2007-03-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual use process, there are many problems in the porous ceramic itself.
For example, when used as a wave-transmitting material, there are the following problems: First, due to the existence of high porosity, porous ceramics are prone to moisture absorption. Pockets or even cracks due to impact
However, this inorganic thin film also has its obvious disadvantages. Since the surface of porous ceramics has many pores and the distribution is uneven, it is difficult to form a film. The formed film has poor uniformity, is easy to crack, and cannot effectively fill the pores of the matrix material. Moreover, the bonding strength with the substrate is poor, and it cannot play the role of sealing and water resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] 1. Preparation of the sealing material: the sealing material is prepared by using a gel with a high solid content as the base phase and adding one or more fillers, and the mass ratio of the filler is 10-100% of the solid content of the gel. The gel can be selected from aluminum gel, silicate gel, or a mixture thereof. The preparation methods of the two gels are as follows:

[0052] (1) Preparation of aluminum gel: use one of ASB (aluminum sec-butoxide) and ASP (aluminum isopropoxide) as raw materials; one or a mixture of deionized water and isopropanol as solvent; HNO 3 As a peptizer; add auxiliary reagents and fillers to prepare aluminum gel.

[0053] Method 1: Use ASB as raw material, H 2 O is the solvent, and nitric acid is the peptizer. The alumina gel is prepared by adding certain auxiliary reagents. By volume ratio ASB: H 2 O=1∶3.5 Measure ASB, H 2 O, H 2 O heated to 80~90℃ in a magnetic stirring heating device, slowly add ASB dropwise to water, stirring continuously ...

Embodiment 1

[0070] 1) Using ASB as raw material, H 2 O is the solvent, and nitric acid is the peptizer. The alumina gel is prepared by adding certain auxiliary reagents. Take 45ml of deionized water and heat it to 80~90℃ in a magnetic stirring heating device. Slowly add 12.82ml of ASB to the water dropwise. Stir continuously for 30min. Use a dropper to add peptizer nitric acid drop by drop until the solution becomes clear, then add Chelating agent ethyl acetoacetate 6.4ml, stirring continuously for 30min, keep the container sealed during this process. After the clear liquid was stirred for 1 hour, the container was unsealed, and 3.6g of PVP was added. After the water continued to evaporate, the clear liquid became thicker and thicker. After it had a certain consistency, added 5g of whisker silicon dispersion and kept stirring. After 3 hours, an alumina gel with a viscosity of 9.45 cps and a colloidal particle size of 5-10 μm is obtained as a base phase, and a sealing gel with silicon whisker ...

Embodiment 2

[0078] 1) Using ASP as raw material, H 2 O is the solvent, and nitric acid is the peptizer. The alumina gel is prepared by adding certain auxiliary reagents. Take 162ml of deionized water, weigh 20.425g of ASP and add it to deionized water after grinding, stir continuously at 80-90℃ for 3 hours in a magnetic stirring heating device, measure 1.04ml of 1.4M nitric acid and add the solution dropwise with a dropper , Continue to stir for 12 hours, centrifuge to precipitate the colloidal part, reflux and dialysis the clear part, and use the colloid mill to grind the obtained colloidal part for 2 hours. An alumina gel with a viscosity of 8.9 cps and a colloidal particle size of 5-10 μm was obtained, and the alumina gel was sealed and stored.

[0079] 2) Using ethyl orthosilicate as raw materials, absolute ethanol and deionized water as solvents, and hydrochloric acid as peptizer to prepare silica sol. Take 47.59ml of absolute ethanol, add 26.8ml of ethyl orthosilicate with a purity of 9...

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Abstract

The pore sealing moisture-proof anticorrosive composite coating material includes pore sealing material and moisture-proof anticorrosive material. The pore sealing material includes gel with high solid phase content as the basic phase and filler(s) in the amount of 10-100 % of the solid phase component. The moisture-proof anticorrosive material is sol, hydrophobic organic matter or their mixture. The pore sealing moisture-proof anticorrosive composite coating material is prepared through the four steps of preparing pore sealing material, preparing moisture-proof anticorrosive material, preparing pore sealing coating and preparing moisture-proof anticorrosive coating. The pore sealing moisture-proof anticorrosive composite coating material has excellent water permeation arresting performance, high hydrophobicity and high corrosion resistance.

Description

Technical field [0001] The invention relates to a new type of moisture-proof composite coating material, in particular to an inorganic type hole-sealing moisture-proof and anticorrosive composite coating material for ceramic substrates, and the preparation of the composite coating material. Background technique [0002] Micropores are inevitably present in general ceramic materials (some porosity can be as high as 50%), which is caused by the inherent characteristics of the material and the manufacturing process. For example, porous ceramics have small bulk density, large specific surface area, selective permeability to liquid and gas media, better energy absorption or pressure resistance characteristics, low thermal conductivity, low dielectric constant, and their own unique The excellent characteristics of high temperature resistance, corrosion resistance and high strength make it more and more widely used in sensors, biological materials, chemical metallurgy, heavy industry, a...

Claims

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Application Information

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IPC IPC(8): C04B41/81
Inventor 程旭东顾少轩杨章富高忠宝张子军邓飞飞
Owner WUHAN UNIV OF TECH
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