CN-122011918-A - Near-infrared response self-repairing coating and preparation method thereof

Abstract

The invention discloses a near-infrared response self-repairing coating and a preparation method thereof, and relates to the technical field of functional coatings. The near infrared response self-repairing coating comprises, by mass, 100 parts of matrix resin, 1-3 parts of near infrared absorbent, 10-20 parts of self-repairing agent, 8-15 parts of curing agent, 1-3 parts of dispersing agent, 0.5-2 parts of defoaming agent and 20-30 parts of solvent. The invention adopts the organic molecular near infrared absorbent with a specific structure, has good compatibility with matrix resin, can realize uniform dispersion of molecular level, avoids the problem that the traditional inorganic photo-thermal material is easy to agglomerate, obviously improves the photo-thermal conversion efficiency, and solves the defect of insufficient photo-thermal conversion capability of the conventional organic dye.

Inventors

• SONG WENSU
• HU JIA
• GONG YUJIAO
• Hu Xiabing
• ZHANG ZHUORAN
• YANG CHANGYUAN

Assignees

• 武汉科思特仪器股份有限公司

Dates

Publication Date

20260512

Application Date

20260318

Claims (10)

1. 1. The near infrared response self-repairing coating is characterized by comprising, by mass, 100 parts of matrix resin, 1-3 parts of near infrared absorbent, 10-20 parts of self-repairing agent, 8-15 parts of curing agent, 1-3 parts of dispersing agent, 0.5-2 parts of defoaming agent and 20-30 parts of solvent; The near infrared absorbent is a compound shown in a formula 1: formula 1: 。
2. 2. The near infrared responsive self-healing coating according to claim 1, wherein the matrix resin is at least one of polyurethane resin and epoxy resin.
3. 3. The near infrared responsive self-healing coating according to claim 1, wherein the self-healing agent is at least one of dithiobiscaprolactam, dithiodibenzothiazole.
4. 4. The near infrared responsive self-repairing coating according to claim 1, wherein the curing agent is matched with the matrix resin, and when the matrix resin is polyurethane resin, the curing agent is at least one of isophorone diisocyanate and toluene diisocyanate, and when the matrix resin is epoxy resin, the curing agent is at least one of 4,4 '-diamino dicyclohexylmethane and 4,4' -diamino diphenyl sulfone.
5. 5. The near infrared responsive self-healing coating according to claim 1, wherein the dispersant is at least one of BYK-161, BYK-163.
6. 6. The near infrared responsive self-healing coating according to claim 1, wherein the defoamer is at least one of BYK-066N, BYK-141.
7. 7. The near infrared responsive self-healing coating according to claim 1, wherein the solvent is at least one of xylene, butyl acetate, propylene glycol methyl ether acetate.
8. 8. A method of producing a near infrared responsive self-healing coating according to any one of claims 1 to 7, comprising the steps of: s1, placing the matrix resin and the solvent in stirring equipment, and stirring for 15-30min at 25-35 ℃ and a rotating speed of 300-500r/min to obtain a resin solution; S2, adding the dispersing agent and the near infrared absorbent into the resin solution, regulating the stirring rotation speed to 800-1200r/min, stirring for 40-60min, and then dispersing by adopting ultrasonic waves to obtain a uniformly dispersed mixed solution A; S3, adding the self-repairing agent and the defoaming agent into the mixed solution A, regulating the stirring rotation speed to 500-700r/min, and stirring for 20-30min to obtain a mixed solution B; s4, adding the curing agent into the mixed solution B, and stirring for 10-20min at the temperature of 25-35 ℃ and the rotating speed of 400-600r/min to obtain coating slurry; And S5, coating the coating slurry on the surface of a substrate in a spraying, blade coating or brush coating mode, standing for 1-2h at room temperature, then placing in a 50-80 ℃ oven for solidification for 2-4h, and cooling to the room temperature to obtain the near infrared response self-repairing coating.
9. 9. The method for preparing the near infrared response self-repairing coating according to claim 8, wherein the power of ultrasonic dispersion in the S2 is 80-120W, the ultrasonic dispersion time is 20-30min, and the temperature of the system is controlled to be not more than 40 ℃ in the dispersion process.
10. 10. Use of a near infrared responsive self-healing coating according to any of claims 1 to 7, wherein said coating is used for surface protection and self-healing of metal components, electronic equipment housings, automotive parts.

Description

Near-infrared response self-repairing coating and preparation method thereof Technical Field The invention relates to the technical field of functional coatings, in particular to a near-infrared response self-repairing coating and a preparation method thereof. Background With the continuous progress of material science, the intelligent coating with the self-repairing function has great application potential in the fields of ships, airplanes, high-speed rails, ocean engineering and the like because of the capability of autonomously repairing microcracks, prolonging the service life of a base material and reducing the maintenance cost. In a plurality of self-repairing triggering mechanisms, the near infrared light response type self-repairing coating is based on a photo-thermal conversion principle, light energy is converted into heat energy by utilizing non-contact remote control, and then polymer chain segment movement is driven or dynamic chemical bond recombination is triggered, so that the rapid repairing of the coating damage is realized, and the method has the remarkable advantages of convenience in operation, high space-time controllability and the like. In the prior art, a mainstream strategy for constructing a near-infrared response self-repairing coating is to physically dope a photo-thermal conversion material in a resin matrix. The commonly used photothermal conversion materials mainly comprise inorganic nano materials such as carbon nano tubes, graphene, gold nanorods, indium tin oxide and the like, and part of conventional organic dyes such as cyanines, phthalocyanine compounds and the like. Although the prior art scheme gives the coating a photo-thermal response characteristic to a certain extent, a plurality of technical bottlenecks are still faced in practical engineering application. On the one hand, for inorganic nano materials, the surface energy is higher, the interfacial compatibility with an organic polymer matrix is poorer, and the agglomeration phenomenon is very easy to occur in the coating preparation and film forming processes. The uneven dispersion not only causes uneven hot spot distribution in the coating and seriously affects the consistency of the self-repairing effect, but also damages the original mechanical property and optical transparency of the coating, thereby limiting the application of the coating in the field with higher requirements on appearance and light transmittance. In addition, a large amount of dispersant is generally required to improve the dispersibility thereof, which further increases the complexity of the system and may introduce impurity defects. On the other hand, for the conventional organic dye photothermal agents, although the compatibility with the resin matrix is relatively good, there are generally problems of low photothermal conversion efficiency and poor light stability. Under the irradiation of near infrared light, the heat generation rate of the material is slower, the generated heat energy is insufficient to quickly drive the rearrangement of the polymer network, the self-repairing response time of the coating is overlong, and the repairing efficiency is low. Meanwhile, part of organic dyes are easy to be photo-bleached or decomposed under long-time illumination, so that the coating fails after being subjected to multiple repair cycles, and the requirement of long-acting service is difficult to meet. Therefore, developing a near-infrared response self-repairing coating with excellent resin compatibility and high-efficiency photo-thermal conversion capability, particularly designing and introducing an organic photo-thermal agent which has a specific structure, can remarkably improve response speed and is dispersed in the resin in molecular level, becomes a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide a near-infrared response self-repairing coating and a preparation method thereof, aiming at the technical problems of low coating repairing response speed caused by poor dispersibility of inorganic photo-thermal filler in a resin matrix and low photo-thermal conversion efficiency of conventional organic dye in the prior art. By introducing organic molecules with specific structures as near infrared absorbers, the molecular level uniform dispersion and high-efficiency photo-thermal conversion of the photo-thermal material in the coating are realized, so that the coating is endowed with rapid and excellent crack self-repairing performance, and meanwhile, the good appearance and mechanical properties of the coating are maintained. In order to achieve the above purpose, the invention adopts the following technical scheme: The near infrared response self-repairing coating comprises, by mass, 100 parts of matrix resin, 1-3 parts of near infrared absorbent, 10-20 parts of self-repairing agent, 8-15 parts of curing agent, 1-3 parts of dispersing agent, 0.5-2 parts of defoaming agent and 20-30 parts