Surface anticorrosive antifouling coating using polydopamine as base layer as well as modification method and application of coating

An anti-fouling coating, polydopamine technology, applied in anti-corrosion coatings, anti-fouling/underwater coatings, coatings, etc., can solve the problems of surface coating bonding strength, anti-corrosion and anti-adhesion long-term application performance to be improved, etc. To achieve the effect of mild preparation conditions and simple preparation technology

Inactive Publication Date: 2020-01-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dopamine (DA) and silane coupling agent (APTES) as "molecular bridges" are widely used in surface modification, which has the advantages of high efficiency, low cost, and easy operation. Adhesion and other properties, especially long-term application performance, still need to be improved

Method used

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  • Surface anticorrosive antifouling coating using polydopamine as base layer as well as modification method and application of coating
  • Surface anticorrosive antifouling coating using polydopamine as base layer as well as modification method and application of coating
  • Surface anticorrosive antifouling coating using polydopamine as base layer as well as modification method and application of coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of anti-corrosion and anti-fouling coating on stainless steel surface

[0042] First, the stainless steel surface is hydroxylated. Cut the stainless steel sheet (thickness 0.05mm) into a square of 1cm×1cm, and then wash it with distilled water, acetone and ethanol under ultrasonic conditions for 15min, and rinse it twice with distilled water. Immerse the cleaned stainless steel sheet in the newly prepared Piranha solution for 30 minutes at room temperature to make the surface rich in hydroxylation. Finally, wash with distilled water for 3 times and store in distilled water for later use.

[0043] Dissolve 60 mg of dopamine hydrochloride in 30 mL of Tris-HCl solution to form a 2 mg / mL dopamine Tris-HCl buffer solution (pH=8.5), and stir at a constant speed for half an hour in the dark. Prepare a hydrolyzate of 30mg / mL APTES (the hydrolyzate is an aqueous ethanol solution containing 0.15wt% glycerol with an alcohol-water volume ratio of 1:6, and the pH value...

Embodiment 2～6

[0051] Press the method of embodiment 1, operate with embodiment 1, difference is to change the concentration of dopamine, temperature of reaction and time, obtain surface coating, measure the grafting density under different conditions, surface contact angle, protein adsorption amount, bacterial adhesion The amount of attachment and the change of anti-corrosion performance. As shown in table 2.

[0052] Table 2 Analysis of coating properties with different concentrations of dopamine solution, reaction temperature and reaction time

[0053]

Embodiment 7-12

[0055] According to the method of Example 1, the operation is the same as in Example 1, except that the concentration, reaction temperature and time of the APTES solution are changed to obtain different surface coatings, as shown in Table 3. The changes in graft density, surface contact angle, protein adsorption, bacterial adhesion and antiseptic performance under different conditions were measured. The results obtained are shown in Table 3.

[0056] Table 3 Analysis of coating properties with different APTES solution concentration, reaction temperature and reaction time

[0057]

[0058]

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Abstract

The invention relates to a surface anticorrosive antifouling coating using polydopamine as a base layer as well as a modification method and application of the coating. Dopamine, 3-aminopropyltriethoxysilane (APTES), and a superhydrophilic polymer (PHiG) containing epoxy groups or a superhydrophobic polymer (PHoG) containing epoxy groups are subjected to a layer-by-layer reaction on the surface ofa substrate to form the ternary composite coating. The method comprises the following steps: immersing the surface of the substrate (SS) in a Tris-HCl buffer solution of the dopamine to obtain polydopamine surface coating SS@PDA; immersing the SS@PDA in a hydrolysate of the APTES to further form organic silicone surface coating SS@PDA / Si at the surface; and immersing the SS@PDA / Si in a phosphatebuffer solution of the PHiG with a pH of 7.4 or an ethyl acetate solution of the PHoG to further modify the surface of the substrate by a polymer to obtain the composite coating SS@PDA / Si / PHiG or SS@PDA / Si / PHoG. The coating is suitable for anticorrosive antifouling modification of a plurality of surfaces.

Description

technical field [0001] The invention relates to a surface anticorrosion and antifouling coating with polydopamine as the bottom layer and its modification method and application. Polymers or superhydrophobic polymers containing epoxy groups are formed by layer-by-layer reaction on the surface of the substrate to form a ternary composite coating. The characteristic is that silicone is used as an intermediary layer, and the coating effectively combines the surface adhesion and anti-corrosion properties of dopamine, and the anti-fouling properties of super-hydrophilic or super-hydrophobic polymers, providing a comparison of the surface anti-corrosion and anti-fouling functions of different materials Simple but effective method. Background technique [0002] Surface corrosion and microbial adhesion bring huge economic losses to the world every year, not only have a great impact on social and economic development, but also pose a great threat to human health and safety. Especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/04C09D183/04C09D133/14C09D5/08C09D5/16
CPCC09D5/08C09D5/1662C09D5/1675C09D133/14C09D179/04C09D183/04
Inventor 董岸杰李双阳邓联东张建华
Owner TIANJIN UNIV
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