阅读说明：本技术 一种工业管道防腐粉末涂料及其制备方法 (Industrial pipeline anticorrosion powder coating and preparation method thereof ) 是由 黄俊峰 徐玮峰 叶名昇 于 2020-08-27 设计创作，主要内容包括：一种工业管道防腐粉末涂料,以重量百分比计,其组分及重量百分数为：环氧树脂65％～70％、固化剂5％～7％、石墨烯5％～8％、阻隔性粉体填料10％～15％。本发明利用具有阻隔作用的片状填料湿法绢云母粉在漆膜内形成基本平行的取向排列,水和其它腐蚀性物质对漆膜的渗透受到强烈阻隔,具有很好的阻隔作用,辅助加入的硅微粉可以填补湿法绢云母粉片层间的排列缝隙,加强阻隔效果,硅微粉本身也具有显著的抗渗、防腐作用；本发明通过嫁接石墨烯组分能够有效地提高环氧树脂粉末涂料的耐热性和耐腐蚀性能；本发明中石墨烯组分具有很强的吸附能力,能够将湿法绢云母粉和针状硅微粉牢固地吸附在金属表面,使得整个涂层具有很强的附着力。(An industrial pipeline anticorrosion powder coating comprises the following components in percentage by weight: 65-70% of epoxy resin, 5-7% of curing agent, 5-8% of graphene and 10-15% of barrier powder filler. The flaky filler wet-process sericite powder with the barrier effect forms basically parallel orientation arrangement in a paint film, water and other corrosive substances are strongly blocked from permeating the paint film, so that the paint film has a good barrier effect, the added silica powder can fill up arrangement gaps among wet-process sericite powder sheets, the barrier effect is enhanced, and the silica powder also has remarkable anti-permeability and anti-corrosion effects; according to the invention, the heat resistance and corrosion resistance of the epoxy resin powder coating can be effectively improved by grafting the graphene component; the graphene component has strong adsorption capacity, and can firmly adsorb wet-process sericite powder and needle-shaped silicon micro powder on the surface of metal, so that the whole coating has strong adhesive force.)

1. The industrial pipeline anticorrosion powder coating is characterized by comprising the following components in percentage by weight: 65-70% of epoxy resin, 5-7% of curing agent, 5-8% of graphene and 10-15% of barrier powder filler.

2. The industrial pipeline anticorrosion powder coating of claim 1, wherein the barrier powder filler is wet-process sericite powder, silica micropowder in a ratio of 2: 1 by weight ratio.

3. The industrial pipeline anticorrosion powder coating of claim 2, wherein the graphene and the barrier powder filler are both modified by a silane coupling agent.

4. The industrial pipeline anticorrosive powder coating as claimed in claim 1, wherein the curing agent is an amine curing agent.

5. The preparation method of the industrial pipeline anticorrosive powder coating is characterized by comprising the following steps:

s1, preparation of a silane coupling agent solution:

mixing and stirring a silane coupling agent, absolute ethyl alcohol and deionized water according to a mass ratio of (15-20) to (60-70) to (8-10) until the mixture is clear, and standing to obtain a silane coupling agent solution;

s2, graphene modification treatment:

firstly, ultrasonically dispersing graphene in deionized water to obtain a graphene dispersion liquid, then placing the graphene dispersion liquid in a reaction kettle, adding the silane coupling agent solution obtained in the step S1, heating and stirring for 60-120 min, keeping the stirring temperature at 70-85 ℃, continuously stirring and cooling to room temperature to obtain a modified graphene solution;

s3, modification treatment of the barrier powder filler:

firstly, sequentially adding wet-process sericite powder and silicon micropowder in the barrier powder filler into a high-speed stirrer according to the proportion in the claim 2, fully mixing at a high speed for 30min at 80-90 ℃, then atomizing and spraying the silane coupling agent solution obtained in the step of S1 into the high-speed stirrer, keeping the temperature for fully mixing at a high speed for 30min, stopping stirring and cooling to room temperature to obtain the modified barrier powder filler;

s4, preparing a modified compound of graphene and barrier powder filler:

adding the modified barrier powder filler obtained in the step S3 into the modified graphene solution obtained in the step S2 while stirring, preserving heat, mixing and stirring at 50-60 ℃, reacting for 30-60 min, cooling to room temperature after the reaction is finished, and then washing, filtering, drying, crushing and sieving to obtain a modified composite of graphene and the barrier powder filler;

s5, preparing the graphene modified powder coating:

according to the proportion in the claim 1, the modified compound of graphene and barrier powder filler obtained in the step S4 and epoxy resin are stirred and mixed uniformly, then curing agent with proportion is added, the mixture is stirred and mixed uniformly to obtain premixed material powder, then the premixed material powder is put into an extruder to be subjected to melt extrusion, cooling and chopping into flakes, and the obtained flakes are ground, sieved and discharged to obtain the graphene modified powder coating.

6. The preparation method of the industrial pipeline anticorrosion powder coating as claimed in claim 5, wherein the wet-process sericite powder and the silica micropowder in the barrier powder filler have a particle size of 1250 meshes.

7. The method for preparing the industrial pipeline anticorrosion powder coating as claimed in claim 5, wherein the silane coupling agent is one or two of gamma-aminopropyltriethoxysilane and gamma-methacryloxypropyltrimethoxysilane.

Technical Field

The invention belongs to the technical field of powder coatings, and particularly relates to an industrial pipeline anticorrosion powder coating and a preparation method thereof.

Background

The powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler and assistant, and is different from ordinary solvent-type coating and water-based coating, and its dispersion medium is not solvent and water, but air, and it has the features of no solvent pollution, hundreds of film forming and low energy consumption. Therefore, powder coatings are the coatings of major development for environmentally friendly coating products. However, the existing epoxy resin powder coating has some defects in the aspects of heat resistance and corrosion resistance, and cannot meet the corrosion prevention requirement of industrial pipelines operating in severe environments, so that the components of the traditional epoxy resin powder coating need to be improved to obtain better heat resistance, corrosion resistance and adhesion, and the traditional epoxy resin powder coating can be better suitable for the operating environment of industrial pipelines.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an industrial pipeline anticorrosive powder coating and a preparation method thereof, and the specific technical scheme is as follows:

an industrial pipeline anticorrosion powder coating comprises the following components in percentage by weight: 65-70% of epoxy resin, 5-7% of curing agent, 5-8% of graphene and 10-15% of barrier powder filler.

Further, the barrier powder filler is wet sericite powder, silicon micropowder, and the weight ratio of 2: 1 by weight ratio.

Further, the graphene and the barrier powder filler are both modified by a silane coupling agent.

Further, the curing agent is an amine curing agent.

A preparation method of an industrial pipeline anticorrosion powder coating comprises the following steps:

s1, preparation of a silane coupling agent solution:

mixing and stirring a silane coupling agent, absolute ethyl alcohol and deionized water according to a mass ratio of (15-20) to (60-70) to (8-10) until the mixture is clear, and standing to obtain a silane coupling agent solution;

s2, graphene modification treatment:

firstly, ultrasonically dispersing graphene in deionized water to obtain a graphene dispersion liquid, then placing the graphene dispersion liquid in a reaction kettle, adding the silane coupling agent solution obtained in the step S1, heating and stirring for 60-120 min, keeping the stirring temperature at 70-85 ℃, continuously stirring and cooling to room temperature to obtain a modified graphene solution;

s3, modification treatment of the barrier powder filler:

firstly, sequentially adding wet-process sericite powder and silicon micropowder in the barrier powder filler into a high-speed stirrer according to the proportion in the claim 2, fully mixing at a high speed for 30min at 80-90 ℃, then atomizing and spraying the silane coupling agent solution obtained in the step of S1 into the high-speed stirrer, keeping the temperature for fully mixing at a high speed for 30min, stopping stirring and cooling to room temperature to obtain the modified barrier powder filler;

s4, preparing a modified compound of graphene and barrier powder filler:

adding the modified barrier powder filler obtained in the step S3 into the modified graphene solution obtained in the step S2 while stirring, preserving heat, mixing and stirring at 50-60 ℃, reacting for 30-60 min, cooling to room temperature after the reaction is finished, and then washing, filtering, drying, crushing and sieving to obtain a modified composite of graphene and the barrier powder filler;

s5, preparing the graphene modified powder coating:

according to the proportion in the claim 1, the modified compound of graphene and barrier powder filler obtained in the step S4 and epoxy resin are stirred and mixed uniformly, then curing agent with proportion is added, the mixture is stirred and mixed uniformly to obtain premixed material powder, then the premixed material powder is put into an extruder to be subjected to melt extrusion, cooling and chopping into flakes, and the obtained flakes are ground, sieved and discharged to obtain the graphene modified powder coating.

Furthermore, the particle sizes of the wet-process sericite powder and the silicon micropowder in the barrier powder filler are 1250 meshes.

Further, the silane coupling agent is one or two of gamma-aminopropyl triethoxysilane and gamma-methacryloxypropyl trimethoxysilane.

The invention has the beneficial effects that:

the flaky filler wet-process sericite powder with the barrier effect forms basically parallel orientation arrangement in a paint film, water and other corrosive substances are strongly blocked from permeating the paint film, so that the paint film has a good barrier effect, the added silica powder can fill up arrangement gaps among wet-process sericite powder sheets, the barrier effect is enhanced, and the silica powder also has remarkable anti-permeability and anti-corrosion effects; according to the preparation method, graphene and barrier powder filler are subjected to wet-process and dry-process coupling modification respectively, the modified graphene and the barrier powder filler are subjected to physical mixing reaction, and a modified compound of the graphene and the barrier powder filler is obtained after a series of steps of washing, filtering, drying, crushing and sieving; the modified compound of graphene and barrier powder filler prepared by the two-step method has high compatibility with epoxy resin and strong binding force, and can be better fused into the whole powder coating after the curing agent is added for crosslinking and curing to form a uniform and stable compound; according to the invention, the heat resistance and corrosion resistance of the epoxy resin powder coating can be effectively improved by grafting the graphene component; the graphene component has strong adsorption capacity, and can firmly adsorb wet-process sericite powder and needle-shaped silicon micro powder on the surface of metal, so that the whole coating has strong adhesive force.

Drawings

Fig. 1 is an electron microscope comparative photograph of a powder coating (a) to which a barrier powder filler is added but no graphene is added and a powder coating (b) to which graphene and a barrier powder filler are added.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the application provides the industrial pipeline anticorrosion powder coating and the preparation method thereof, the flaky filler wet-process sericite powder with the barrier effect is utilized to form basically parallel orientation arrangement in a paint film, the penetration of water and other corrosive substances to the paint film is strongly blocked, the coating has good barrier effect, the added silicon micro powder can fill up arrangement gaps among wet-process sericite powder sheets, the barrier effect is enhanced, and the silicon micro powder also has remarkable anti-permeability and anticorrosion effects; the method comprises the steps of firstly, separately carrying out wet method and dry method coupling modification on graphene and barrier powder filler, then carrying out physical mixing reaction on the modified graphene and the barrier powder filler, and carrying out a series of steps of washing, filtering, drying, crushing and sieving to obtain a modified compound of the graphene and the barrier powder filler; the modified compound of graphene and barrier powder filler prepared by the two-step method has high compatibility with epoxy resin and strong binding force, and can be better fused into the whole powder coating after the curing agent is added for crosslinking and curing to form a uniform and stable compound; according to the application, the heat resistance and the corrosion resistance of the epoxy resin powder coating can be effectively improved by grafting the graphene component; the graphene component has strong adsorption capacity, and can firmly adsorb wet-process sericite powder and needle-shaped silicon micro powder on the metal surface, so that the whole coating has strong adhesive force.

In order to solve the above problems, the technical solution in the embodiment of the present application has the following general idea:

the graphene is a two-dimensional carbon atom sheet formed by hybridized carbon atoms, and the carbon atoms are in a hexagonal honeycomb shape; the graphene is characterized by being formed by a layer of carbon atoms and endowed with various properties, for example, graphene has excellent properties of high temperature resistance, corrosion resistance and the like; based on the well-known excellent performance of graphene, researchers add graphene as a reinforcement into powder coatings to improve the performance of the powder coatings in terms of high temperature resistance and corrosion resistance.

Due to the fact that the graphene material is large in specific surface area and interaction is easy to occur between the sheet layers, agglomeration is easy to occur, graphene aggregate not only reduces self adsorption capacity but also hinders the exertion of excellent performance of graphene, and therefore graphene is subjected to ultrasonic dispersion in deionized water at first and then is modified by the silane coupling agent in a wet environment, and the compatibility of graphene and epoxy resin is enhanced.

Sericite is natural fine-grained muscovite, is silicate with a layered structure, can be split into extremely thin sheets, the thickness of each sheet can reach below 1 mu m, the diameter-thickness ratio is large, the wear resistance and the wear resistance are good, the heat resistance and the insulation are realized, the sericite is insoluble in acid-base solution, and the chemical property is stable; compared with the common dry-method sericite powder, the wet-method sericite powder has high purity and can better play the lamellar barrier effect; the silicon micropowder can effectively fill up the lamellar gaps of the sericite powder, and the silicon micropowder and the sericite powder can form an excellent barrier in cooperation, so that the sericite powder has anti-permeability and anti-corrosion effects.

Because sericite powder and silicon micropowder are inorganic powder fillers and epoxy resin are poor in compatibility, coupling modification treatment needs to be carried out on the inorganic powder fillers, however, how to better disperse and fuse the two inorganic powder fillers and graphene needs to be carried out in two steps: firstly, carrying out wet modification and dry modification on graphene and powder filler respectively; and secondly, putting the inorganic powder filler modified by the dry method into the graphene solution modified by the wet method, carrying out temperature-controlled physical mixing reaction on the inorganic powder filler and the graphene solution to form a uniform solution system, and carrying out a series of steps of washing, filtering, drying, crushing and sieving to obtain the modified compound of the graphene and the inorganic powder filler.

The curing action of the amine curing agent on the epoxy resin is to open an epoxy group by active hydrogen on a nitrogen atom so as to crosslink and cure the epoxy resin; the amine curing agent can effectively improve the heat resistance and corrosion resistance of the product, and can also improve the impact resistance and shear strength of the product.

Both the gamma-aminopropyltriethoxysilane and the gamma-methacryloxypropyltrimethoxysilane are colorless transparent liquids, can be dissolved in water and hydrolyzed in water, are used for coupling organic polymers and inorganic materials, enhance the cohesiveness and compatibility of the organic polymers and improve the mechanical, water-resistant, ageing-resistant and other properties of the product.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.