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Method for preparing self-repairing polyelectrolyte coating based on layer-by-layer assembly technology

A technology of layer-by-layer assembly and polyelectrolyte, applied in coatings, alginic acid coatings, devices for coating liquids on surfaces, etc., to achieve easy-to-achieve effects

Inactive Publication Date: 2012-01-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research of layer-by-layer assembly coatings as endogenous self-healing coatings has just begun, and many issues remain to be studied

Method used

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  • Method for preparing self-repairing polyelectrolyte coating based on layer-by-layer assembly technology
  • Method for preparing self-repairing polyelectrolyte coating based on layer-by-layer assembly technology
  • Method for preparing self-repairing polyelectrolyte coating based on layer-by-layer assembly technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Preparation of self-healing PAH / PAA coating

[0037] Soak the treated monocrystalline silicon substrate in PAH (5mg / mL, pH=10) aqueous solution for 15 minutes, take it out, wash the substrate with water and N 2 Blow dry, then soak in PAA (5mg / mL, pH=4) aqueous solution for 15 minutes, after taking out, the substrate is washed with water and N 2 blow dry. Wherein, the pH values ​​of the PAH and PAA aqueous solutions are adjusted by using a 1 mol / L aqueous hydrochloric acid solution and a 1 mol / L sodium hydroxide aqueous solution.

[0038] Repeat the above steps 30 times to obtain a self-healing polyelectrolyte coating. figure 1 The change of coating thickness with the number of deposition cycles is tracked and monitored by scanning electron microscopy. It shows that the growth of the coating shows a typical exponential growth pattern, that is, the thickness of the coating increases rapidly as the number of deposition cycles increases. The thickness of t...

Embodiment 2

[0041] Embodiment 2: the self-healing ability of layer-by-layer assembly PAH / PAA coating

[0042] (PAH / PAA)*30 coating has very good self-healing ability. We used a digital camera and a scanning electron microscope to characterize the self-healing process of the coating, where ( image 3 a, b, c) are optical photographs ( image 3 d, e, f) are scanning electron micrographs. We first use a scalpel to make scratches about 50 microns wide and deep into the substrate on the coating ( image 3 a and d). Then soak the coating in water for a short time (about 10s) and take it out and dry it with nitrogen. It can be seen that the wound has a tendency to heal obviously ( image 3 b and e). After the coating was soaked in water for 5min, the nitrogen gas was taken out and dried, and the wound on the coating was completely healed ( image 3 c and f). Of course, after we spray water on the damaged coating surface and let it stand for 5 minutes or put the damaged coating in an envir...

Embodiment 3

[0045] Embodiment 3: the preparation of self-healing PEI / HA coating

[0046] In addition to using PAH and PAA to prepare self-healing coatings, this method of layer-by-layer assembly for self-healing coatings can also be extended to other materials such as PEI and HA.

[0047] Soak the treated monocrystalline silicon substrate in PEI (5 mg / mL, pH=10) aqueous solution for 15 minutes, take it out and wash the substrate with water and N 2 Blow dry, then soak in HA (5mg / mL, pH=4) aqueous solution for 15 minutes, after taking out, the substrate is washed with water and N 2 blow dry. Wherein, the pH values ​​of the PEI and HA aqueous solutions are adjusted by using a hydrochloric acid aqueous solution with a concentration of 1 mol / L and an aqueous sodium hydroxide solution with a concentration of 1 mol / L.

[0048] Repeat the above steps 50 times to obtain a self-healing polyelectrolyte coating. Image 6 The change of coating thickness with the number of deposition cycles is track...

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Abstract

The invention belongs to the technical field of preparation of self-repairing coatings, and relates to a method for preparing a polyelectrolyte coating having self-repairing capability based on a layer-by-layer assembly technology. The prepared polyelectrolyte coating has high strength in the air and high mobility when the coating is immersed in water or the water is sprayed on the coating, so huge scratches caused by mechanical damage on the coating can be spontaneously repaired. The self-repairing polyelectrolyte coating has the advantages that: a repair means is easy to implement, the sameposition can be repeatedly and spontaneously repaired, and the preparation of the coating is free from the limitation of a substrate. Moreover, the method for preparing the self-repairing polyelectrolyte coating is simple, and the used raw materials are non-toxic and harmless. The method for preparing the self-repairing coating is believed to contribute to research of aspects comprising material science, surface chemistry, polymer science and the like, and the self-repairing polyelectrolyte coating is expected to be widely applied in aspects of preparation of protective coatings, biological material coatings, display equipment and the like.

Description

technical field [0001] The invention belongs to the technical field of self-healing coating preparation, and in particular relates to a method for preparing a polyelectrolyte coating with self-healing ability by using layer-by-layer assembly technology. This self-healing polyelectrolyte coating has the advantages of easy repair means, multiple self-healing at the same position, and the preparation of the coating is not limited by the substrate. It is expected to be widely used in the preparation of protective coatings, biomaterial coatings, and display devices. Applications. Background technique [0002] Self-healing materials can spontaneously repair mechanical damage caused during use. People are more dependent on self-healing materials because self-healing materials can effectively extend the service life of materials and reduce the cost of re-production (Annu. Rev. Mater. Res. 2010, 40, 179-211). Among the numerous self-healing materials, self-healing coatings that can...

Claims

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Application Information

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IPC IPC(8): B05D5/12B05D7/00C09D179/02C09D133/02C09D105/04G02B1/10
Inventor 孙俊奇王旭
Owner JILIN UNIV
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