US-12617952-B1 - Self-ameliorate-fissure-responsive pod system for alkyd-polyester aircraft runway paint

US12617952B1US 12617952 B1US12617952 B1US 12617952B1US-12617952-B1

Abstract

An alkyd-polyester paint which includes an alkyd resin, a polyester resin and three fissure-responsive microcapsules. The first microcapsule contains an epoxy resin, a polythiol and a hypervalent iodine compound. The second microcapsule contains a diamine and a photoinitiator. The third microcapsule contains a phosphine.

Inventors

Mona Obead Albalawi
Moatassim Mohamed Raoof Mohamed Rashad Shindy
Magdy Youssef Ali Abdelaal
Humaira Parveen
Mohammed Suliman M. Almoiqli

Assignees

UNIVERSITY OF TABUK

Dates

Publication Date: 20260505
Application Date: 20251113

Claims (20)

1 . An alkyd-polyester paint, comprising: an alkyd resin, a polyester resin and first, second and third fissure-responsive microcapsule encapsulated compositions, the first fissure-responsive microcapsule composition comprising first microcapsules containing an epoxy resin, a polythiol and a hypervalent iodine compound; the second fissure-responsive microcapsule composition comprising second microcapsules containing a diamine and a photoinitiator; and the third fissure-responsive microcapsule composition comprising third microcapsules containing a phosphine.
2 . The alkyd-polyester paint of claim 1 , further comprising a pigment.
3 . The alkyd-polyester paint of claim 1 , further comprising a rheology modifier, a UV stabilizer, an anti-settling agent.
4 . The alkyd-polyester paint of claim 1 , wherein the epoxy resin is one or more selected from the group consisting of bisphenol A diglycidyl ether (DGEPA), a diglycidyl ether of bisphenol F (DGEBF), and a cycloaliphatic epoxy.
5 . The alkyd-polyester paint of claim 1 , wherein the polythiol is polyerythritol tetrakis merkaptopropionate (PTKMP).
6 . The alkyd-polyester paint of claim 1 , wherein the hypervalent iodine compound is iodobenzene diacetate (IBDA).
7 . The alkyd-polyester paint of claim 1 , wherein the photoinitiator is 2,2-dimethoxy-2-phenylacetophenone (DMPA).
8 . The alkyd-polyester paint of claim 1 , wherein the diamine is N,N,N′,N′-tetramethyl-1,6-hexanediamine.
9 . The alkyd-polyester paint of claim 1 , wherein the microcapsules are made of one or more polymers selected from the group consisting of cellulose acetate butyrate, ethyl cellulose, polylactide, and poly(methyl methacrylate).
10 . The alkyd-polyester paint of claim 1 , wherein the phosphine is tributyl phosphine (TBP).
11 . The alkyd-polyester paint of claim 1 , wherein the first, second and third fissure-responsive microcapsule encapsulated compositions are uniformly dispersed throughout the paint.
12 . The alkyd-polyester paint of claim 1 , wherein the first, second and third microcapsules are spherical and have a diameter of 10-100 μm.
13 . The alkyd-polyester paint of claim 1 , where in the first, second and third fissure-responsive microcapsule encapsulated compositions are 1-30 wt % of the paint.
14 . The alkyd-polyester paint of claim 1 , wherein the first, second and third microcapsules have a shell thickness of 100 nm-1 μm.
15 . A method of repairing a defect in paint, comprising: rupturing the first, second and third microcapsules of the alkyd-polyester pain of claim 1 such that the contents of the first second and third microcapsules release and polymerize to repair the defect in the paint, wherein the rupturing can be caused by impact forces, shear forces, and/or abrasion.
16 . The alkyd-polyester paint of claim 1 , wherein the first, second and third microcapsules rupture under pressures of 10-100 MPa and shear forces of 5-50 MPa.
17 . A method of making the alkyd-polyester paint of claim 1 , comprising: heating pentaerythritol and a fatty acid at 150-200° C. under nitrogen for 1-3 hours to form monoglycerides; adding phthalic anhydride to the monoglycerides and heating the mixture to 200-260° C. to form a alkyd resin, mixing the alkyd resin with a polyester resin and first, second and third fissure-responsive microcapsule encapsulated compositions to form the alkyd-polyester paint.
18 . A method of claim 17 , further comprising: dissolving cellulose acetate butyrate in xylene to form a solution; mixing an epoxy resin, a polythiol and a hypervalent iodine compound to form a mixture; adding the mixture to the solution to form an emulsion; adding the emulsion to an organic solvent to form the first microcapsule.
19 . A method of claim 17 , further comprising: dissolving cellulose acetate butyrate in xylene to form a solution; mixing a diamine and a photoinitiator to form a mixture; adding the mixture to the solution to form an emulsion; adding the emulsion to an organic solvent to form the second microcapsule.
20 . A method of claim 17 , further comprising: dissolving cellulose acetate butyrate in xylene to form a solution; mixing a phosphine to form a mixture; adding the mixture to the solution to form an emulsion; adding the emulsion to an organic solvent to form the third microcapsule.

Description

BACKGROUND Technical Field The present disclosure is directed towards a synthesis of an alkyd-polyester paint, more particularly, an alkyd-polyester paint used for aircraft runway paints. Description of Related Art The “background” description provided herein is for the purpose of generally presenting the context of the disclosure. The work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description which may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present invention. The maintenance and durability of important infrastructure such as airport runways present significant technical and operational challenges. Runway surfaces are subjected to extreme mechanical stresses from continuous aircraft activities, including landings, take-offs, and taxiing. In addition to these dynamic loads, the surfaces endure harsh environmental conditions, such as wide-ranging temperature fluctuations and prolonged exposure to chemically aggressive substances like jet fuel, hydraulic fluids, and de-icing agents. These combined factors often result in the rapid degradation of surface coatings, leading to the formation of cracks, fissures, and other structural discontinuities. Such deterioration not only includes the visibility and functional markings important for safe aircraft operations but also accelerates the deterioration of the underlying substrate. This, in turn, necessitates frequent repair cycles and reapplication of protective coatings-activities that are both costly and time-intensive, often requiring partial or complete runway closures that disrupt normal airport operations. In response to these challenges, significant research efforts have been directed toward the development of self-healing polymeric materials capable of autonomously repairing minor damage and restoring the protective integrity of coatings. Among the various strategies investigated, microcapsule-based self-healing systems have gained particular prominence. These systems are typically designed to encapsulate reactive healing agents that are released upon mechanical damage to the coating, triggering a localized repair mechanism at the site of injury. One solution utilizes a system comprising unsaturated polyester resin chemistry. Upon capsule rupture, healing is initiated through oxygen-induced cross-linking reactions. While this technology demonstrates some potential for durability and general coating applications, it is not specifically designed to withstand the extreme demands of airport runway environments. In particular, it does not address performance requirements such as enhanced resistance to chemical attack or high thermal stability-properties important for coatings exposed to aviation-related stressors. Another solution comprises a self-healing coating system developed to mitigate the spread of lead dust. In this approach, microcapsules release film-forming agents upon physical damage to seal affected areas. However, this solution is primarily intended for general or environmental applications and lacks consideration for the unique combination of thermal and chemical stress experienced by runway surfaces. A third solution describes a thermosetting polyurethane asphalt material that incorporates slow-release microcapsule technology. Here, amine curing agents are released under applied load to improve the material's mechanical response. Although promising in theory, this system requires high-temperature processing in the range of 80-160° C. during mixing and curing. Such elevated temperatures may degrade sensitive healing agents, limiting their effectiveness in real-time ambient healing scenarios. However, this solution does not have chemical resistance or long-term thermal stability, further limiting its applicability in aviation infrastructure. While the existing research reflects meaningful progress in the field of self-healing materials, these technologies fall short of providing a comprehensive, robust solution tailored to the extreme environmental, chemical, and mechanical conditions of airport runways. The unmet need for advanced coating systems capable of autonomous repair under such conditions highlights the importance of developing self-healing polymers specifically engineered for the demands of aviation infrastructure. Accordingly, one object of the present disclosure is to provide a method of synthesizing an alkyd-polyester paint that may circumvent the above specified drawbacks and limitation of the materials and methods known in the art. SUMMARY In an exemplary embodiment, an alkyd-polyester paint is described. The alkyd-polyester paint includes an alkyd resin, a polyester resin and three fissure-responsive microcapsules. A first microcapsule contains an epoxy resin, a polythiol and a hypervalent iodine compound. A second microcapsule contains a diamine and a photoinitiator. A t