CN-122011897-A - Capsaicin derivative modified epoxy resin fluorescent coating, and preparation method and application thereof

Abstract

The invention discloses a capsaicin derivative modified epoxy resin fluorescent coating, which is prepared by taking capsaicin amide derivatives as functional curing agents, and polyether amine curing agents and epoxy resin as raw materials through heating and curing. The fluorescent coating has enhanced mechanical property and adhesive force, emits bright indigo fluorescence under 365nm ultraviolet light excitation, and has early self-warning function on metal corrosion. The fluorescent coating has wide application prospect in intelligent corrosion prevention monitoring in the fields of important infrastructure, ships, chemical equipment and the like.

Inventors

• HU YANG
• Jiang Qiongrui
• CHU ZHUANGZHUANG
• YANG ZHUOHONG
• FANG CHENGJUN
• LI XIAOBIN

Assignees

• 华南农业大学

Dates

Publication Date

20260512

Application Date

20260209

Claims (9)

1. 1. The capsaicin derivative modified epoxy resin fluorescent coating is characterized by comprising raw materials of epoxy resin, polyether amine curing agent and capsaicin amide derivative, wherein the mole number of amino groups of the capsaicin amide derivative accounts for 1-4% of the total mole number of amino groups of the capsaicin amide derivative and the polyether amine curing agent, and the structural formula of the capsaicin amide derivative is shown as the following formula: 。
2. 2. the capsaicin derivative modified epoxy resin fluorescent coating according to claim 1, wherein the molar ratio of the epoxy groups of the epoxy resin to the amino hydrogens in the raw material is 1:0.5-2, and the molar number of the amino hydrogens in the raw material is the sum of the molar number of the polyether amine curing agent and the amino hydrogens of the capsaicin amide derivative.
3. 3. The capsaicin derivative modified epoxy resin fluorescent coating according to claim 1, wherein the polyetheramine curing agent is polyetheramine with an average molecular weight of 200-600.
4. 4. The capsaicin derivative modified epoxy fluorescent coating as defined in claim 1, wherein the epoxy resin is bisphenol a epoxy resin.
5. 5. A method for preparing a capsaicin derivative modified epoxy resin fluorescent coating as defined in any one of claims 1-4, comprising the steps of: s1, dissolving capsaicin amide derivatives in polyether amine curing agents to obtain mixed curing agents; s2, adding epoxy resin into the mixed curing agent to obtain a resin mixture; s3, curing the resin mixture at 75-85 ℃ for 2.5-3.5 hours to obtain the resin.
6. 6. The method according to claim 5, wherein step S2 further comprises the step of stirring and sonicating the resin mixture.
7. 7. Use of the capsaicin derivative modified epoxy resin fluorescent coating as defined in any one of claims 1-4 in preparing a metal substrate protective material.
8. 8. The use according to claim 7, wherein the metal substrate contains elemental iron.
9. 9. Use of a capsaicin derivative modified epoxy resin fluorescent coating as defined in any one of claims 1-4, in the preparation of intelligent corrosion resistant materials or corrosion monitoring sensor systems.

Description

Capsaicin derivative modified epoxy resin fluorescent coating, and preparation method and application thereof Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a capsaicin derivative modified epoxy resin fluorescent coating, and a preparation method and application thereof. Background Epoxy resin coatings have become an indispensable key material in the field of metal protection due to their excellent adhesion, excellent mechanical strength, good chemical resistance and reliable substrate protection. However, most of the conventional epoxy coatings are passively protected, and early warning cannot be provided for early corrosion of metal under the coating or tiny damage of the coating, which may lead to untimely maintenance, and serious safety accidents and economic losses are caused. Development of intelligent coatings with self-sensing and self-reporting capabilities is an important direction for breaking through the bottleneck of traditional protection technologies. Among the detection means, the fluorescence detection method is widely focused by virtue of the unique advantages of ultrahigh sensitivity, quick response capability, high spatial resolution, visual and visible signals and the like. Currently, most studies use physical blending to introduce commercial fluorescent dyes or nano-fluorescent materials into the coating matrix. However, this simple blending strategy has several essential drawbacks, including poor compatibility between the fluorescent component and the polymer matrix, easy phase separation, migration and aggregation, resulting in fluorescence quenching and non-uniform properties, and the introduction of exogenous fluorescent components often negatively affects the mechanical integrity, durability and interfacial binding force of the coating. In addition, the ability of physically entrapped fluorescent molecules to recognize specific corrosion factors, specificity, is often difficult to meet the requirements of practical engineering monitoring. Therefore, the development of the epoxy resin fluorescent coating with stable fluorescent performance and excellent mechanical properties has wide application prospect. Disclosure of Invention The invention aims to overcome the technical defects of poor fluorescence stability, impaired mechanical properties, insufficient response specificity to corrosion factors and the like of a physical blending fluorescent coating in the prior art, and provides a capsaicin derivative modified epoxy resin fluorescent coating which has stable fluorescence performance and excellent mechanical properties and can realize high-selectivity and high-sensitivity fluorescence response to Fe 3+. According to a first aspect of the invention, there is provided a capsaicin derivative modified epoxy fluorescent coating, the raw materials of which consist of epoxy resin, polyetheramine curing agent and capsaicin amide derivative; Wherein the structural formula of the capsaicin amide derivative is shown as the following formula: 。 According to the capsaicin derivative modified epoxy resin fluorescent coating, capsaicin amide derivatives (BSPC) are used as raw materials, are not only functional monofunctional curing agents, but also are used as fluorescent sources to perform specific coordination with a metal corrosion product Fe 3+, so that a remarkable fluorescence quenching effect is generated, and an early self-warning function of the coating on metal corrosion is provided. Meanwhile, the capsaicin amide derivative has a rigid benzene ring structure, so that the tensile strength, modulus and surface hardness of the coating are enhanced, and meanwhile, the polar group of the capsaicin amide derivative promotes the adhesive force. In some embodiments, the number of moles of amino groups of the capsaicin amide derivative is 1% -4% of the total number of moles of amino groups of the capsaicin amide derivative and the polyetheramine curing agent. In some embodiments, the moles of amino groups of the capsaicin amide derivative account for 3% of the total moles of amino groups of the capsaicin amide derivative and the polyetheramine curing agent. If the percentage of the mole number of the amino groups of the capsaicin amide derivative relative to the total mole number of the amino groups of the capsaicin amide derivative and the polyether amine curing agent is low, the functions such as mechanical property, thermomechanical property, thermal stability and fluorescence property are insufficient, the network structure is weakened, and the optimal design of the coating crosslinked network structure is realized by systematically regulating and controlling the mole number of the amino groups of the capsaicin amide derivative in the raw materials. In some embodiments, the polyetheramine curing agent is a polyetheramine having an average molecular weight of 200 to 600. BSPC has good affinity with ether bond and amine g