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Self-repairing water-based coating based on PU/PUF micro-capsules and PCL micro-capsules and preparation method thereof

A water-based coating and microcapsule technology, applied in microcapsule preparation, microsphere preparation, coating, etc., can solve the problems of irreversible damage, difficult to detect and monitor deep defects and damage of coatings, reduce costs, prolong The effect of service life

Active Publication Date: 2019-01-04
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional repair methods, such as welding and patching, are completely unable to restore damage due to microcracks and eventual corrosion, because it is difficult to detect and monitor very small depth defects and damage inside the coating, especially if they are in such a microscopic Heal or repair horizontally

Method used

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  • Self-repairing water-based coating based on PU/PUF micro-capsules and PCL micro-capsules and preparation method thereof
  • Self-repairing water-based coating based on PU/PUF micro-capsules and PCL micro-capsules and preparation method thereof
  • Self-repairing water-based coating based on PU/PUF micro-capsules and PCL micro-capsules and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The specific process of preparing PU / PUF double-shell microcapsules is as follows:

[0051] 1) At 22°C, take 110mL of 14.3wt% gum arabic solution; then add 2.12g of urea, 0.23g of ammonium chloride and 0.19g of resorcinol to the gum arabic solution; then, add acid to raise the pH to 3.4; Then add a defoamer to remove surface air bubbles to obtain a mixed solution;

[0052] 2) Under the protection of an inert gas, dissolve 4.23g of TDI (toluene diisocyanate prepolymer) curing agent in 4mL of ethyl acetate, add 29.63g of IPDI after the curing agent is completely dissolved, and mix evenly to obtain a mixture;

[0053] 3) Then pour the mixture into the mixed solution, stir for 10-30 minutes, add 5.86g of formaldehyde, and raise the temperature to 55°C. After continuous stirring for 3.3 hours, cool to room temperature; after several times of filtration, dry in a fume hood at room temperature to obtain PU / PUF microcapsules.

[0054] Such as figure 1 As shown, the spectra o...

Embodiment 2

[0067] The specific process of preparing PU / PUF double-shell microcapsules is as follows:

[0068] 1) At 25°C, get 132mL of 12.2wt% chitosan solution; then add 1.99g urea, 0.23g ammonium chloride and 0.22g resorcinol to the chitosan solution; subsequently, add acid to increase the pH to 3.1; Then add defoamer to remove surface air bubbles to obtain a mixed solution;

[0069] 2) Under the protection of an inert gas, 3.96g MDI prepolymer (diphenylmethane diisocyanate prepolymer) curing agent was dissolved in 4.5mL ethyl acetate, and after the curing agent was completely dissolved, 27.52g HDI prepolymer (6 methylene diisocyanate prepolymer), uniformly mixed to obtain a mixture;

[0070] 3) Then pour the mixture into the mixed solution, stir for 10-30 minutes, add 6.19g of formaldehyde, and raise the temperature to 63°C. After continuous stirring for 4.10 hours, cool to room temperature; after several times of filtration, dry in a fume hood at room temperature to obtain PU / PUF m...

Embodiment 3

[0077] The specific process of preparing PU / PUF double-shell microcapsules is as follows:

[0078] 1) At 28°C, take 123mL of 10.1wt% gum arabic solution; then add 2.35g urea, 0.26g ammonium chloride and 0.28g resorcinol to the gum arabic solution; then add acid to raise the pH to 4.5; Then add a defoamer to remove surface air bubbles to obtain a mixed solution;

[0079] 2) Under the protection of an inert gas, dissolve 4.38g of TDI curing agent in 4mL of ethyl acetate, add 26.3g of IPDI after the curing agent is completely dissolved, and mix evenly to obtain a mixture;

[0080] 3) Then pour the mixture into the mixed solution, stir for 10-30 minutes, add 6.4g of formaldehyde, and raise the temperature to 64°C. After continuous stirring for 3.6 hours, cool to room temperature; after several times of filtration, dry in a fume hood at room temperature to obtain PU / PUF microcapsules.

[0081] The specific process of preparing PCL microcapsules is as follows:

[0082] At 28°C, a...

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Abstract

The invention discloses a self-repairing water-based coating based on PU / PUF micro-capsules and PCL micro-capsules and a preparation method thereof. PU / PUF micro-capsules and PCL micro-capsules are added into a water-based coating and stirred to be uniform to obtain the self-repairing water-based coating, wherein the coating is prepared from, by mass, 12-20% of PU / PUF micro-capsules, 0.6-3.6% of PCL micro-capsules and the balance water-based coating. After coating film formation, scratching treatment is performed on the surface of the coating, under the normal temperature condition, and the scratches of the coating with the micro capsules can achieve the self-repairing rate being 80% or above within 24 h. The self-repairing water-based coating is simple in self-repairing condition, synthesis raw materials are cheap and easy to obtain, and industrial production can be achieved.

Description

technical field [0001] The invention belongs to the field of polymer water-based coatings, in particular to a self-repairing water-based coating based on PU / PUF microcapsules and PCL microcapsules and a preparation method thereof. Background technique [0002] The so-called paint is a substance that is in a fluid state, can expand and form a film on the surface of an object, and can be heated and supplied with other energy over time, and can be firmly adhered and solidified on the surface to be painted to form a continuous film with specific properties. It is used for surface decoration of wood products or wooden materials in wood processing and production. It used to be called paint. Since the 20th century, with the development of polymer materials, various synthetic resin paints have become more and more, so it has been renamed paint. Coatings are applied to the surface of a material in order to improve its appearance, physical and mechanical properties. Prevent materials...

Claims

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Application Information

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IPC IPC(8): C09D7/65B01J13/14B01J13/06
CPCB01J13/06B01J13/14C09D7/65C09D7/70
Inventor 陈鑫田雨陈荣华梁斌罗俊君刘涛白永康田然陈莉靳荣华王向东袁萍芸张纪雯郭晓燕于小倩
Owner XI AN JIAOTONG UNIV
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