阅读说明：本技术 一种海洋环境专用的涂料、涂层以及涂层制备方法 (Special coating for marine environment, coating and coating preparation method ) 是由 周兰康 黄玉立 于 2021-08-02 设计创作，主要内容包括：本发明提供一种海洋环境专用的涂层,涂层从里到外依次包括电镀锌层、锌系磷化层、富锌底粉层和面漆层。本发明还提供一种海洋环境专用的涂料,包括树脂、固化剂、氧化锌、流平剂、安息香；本发明还提供一种海洋环境专用的涂层的制备方法；采用三明治法,把不同涂层做成了四层,合适的厚度多道,比简单厚涂,防腐蚀效果好很多,特别是中间加了第二道锌系磷化层,使得涂层的附着力、封闭性和耐盐雾时间成倍增加。(The invention provides a special coating for a marine environment, which sequentially comprises an electro-galvanizing layer, a zinc series phosphating layer, a zinc-rich primer layer and a finish paint layer from inside to outside. The invention also provides a special coating for marine environment, which comprises resin, a curing agent, zinc oxide, a flatting agent and benzoin; the invention also provides a preparation method of the coating special for the marine environment; by adopting the Sanming method, the different coatings are made into four layers, the proper thickness is multiple, compared with the simple thick coating, the anticorrosive effect is good, and particularly, the second zinc series phosphating layer is added in the middle, so that the adhesive force, the sealing property and the salt spray resistant time of the coating are multiplied.)

1. A coating special for marine environment is characterized in that: the coating comprises an electro-galvanizing layer, a zinc series phosphating layer, a zinc-rich base powder layer and a finish paint layer from inside to outside in sequence.

2. A marine environment specific coating according to claim 1, wherein:

the thickness of the first zinc electroplating layer is 20 +/-3 microns;

the thickness of the second zinc series phosphate coating is 15 +/-2 microns;

the thickness of the third zinc-rich base powder layer is 100 +/-10 microns;

the thickness of the fourth finishing paint layer is 70 +/-20 microns.

3. A marine environment specific coating according to claim 2, wherein:

the surface paint layer is a hydroxyl polyester + TGIC thermosetting powder coating.

4. A marine environment specific coating according to claim 3, wherein:

and dip-coating the third zinc-rich primer layer by using a fluidized bed.

5. A marine environment specific coating according to claim 4, wherein:

and after the first zinc electroplating layer is finished, placing for 12-24 hours to plate a second zinc series phosphating layer.

6. A marine environment-specific coating applied to the zinc-rich primer layer of the marine environment-specific coating according to any one of claims 1 to 5, characterized in that: the coating of the zinc-rich primer layer comprises or consists of a mixture of the following substances, wherein the weight percentages are relative to the total weight of the composition:

a resin; the weight percentage is 50 percent;

a curing agent; the weight percentage is 2.5 percent;

zinc oxide; the weight percentage is 46 percent;

leveling agent; the weight percentage is 1 percent;

benzoin; the weight percentage is 0.5%.

7. The marine environment-specific coating of claim 6, wherein:

the resin is 604 epoxy resin;

the curing agent is dicyandiamide curing agent.

8. A method of preparing a marine environment specific coating for preparing a marine environment specific coating according to any one of claims 1 to 5, characterized by: the method comprises the following steps:

1) electroplating zinc on the surface of the workpiece to form a first zinc electroplating layer;

2) carrying out zinc series phosphating on the workpiece obtained in the step 1) by using a zinc series phosphating solution to form a second zinc series phosphating layer;

3) dip-coating the workpiece obtained in the step 2) by using zinc-rich base powder to form a third zinc-rich base powder layer;

4) and painting the workpiece obtained in the step 3) to form a fourth finish paint layer.

Technical Field

The invention relates to a coating process, in particular to a coating special for marine environment, a coating and a coating preparation method.

Background

The marine environment has high salt fog and corrosion resistance, and has high requirements on salt fog resistance, corrosion resistance and wrapping property of the coating. The common coating is used in common environment and is not enough to deal with marine environment at all.

Salt spray corrosion is a common and most destructive atmospheric corrosion. The salt fog causes corrosion to the surface of the material due to the fact that contained chloride ions penetrate through an oxide layer and a protective layer of the metal surface and are subjected to electrochemical reaction with the internal metal. Meanwhile, the chloride ions contain certain hydration energy, are easily extruded by gaps and cracks on the metal surface and replace oxygen in an oxide layer, and insoluble oxides are changed into soluble chlorides, so that the passivated surface is changed into an active surface.

Normal coating, salt spray resistance within 480 hours; excellent coating, salt spray resistance is about 720 hours; the salt fog resistance of the special coating can reach 1440 hours.

In general environment, the salt fog requirement is not high, and the salt fog requirement is not high in common coating. In snowy days in the north, the industrial salt snow-melting agent is used in a large amount, so that the automobile coating has a certain salt mist resistance requirement, and the requirement is 720 hours.

Accordingly, there is a need for improvements in the art.

Disclosure of Invention

The invention aims to provide a coating, a coating layer and a coating layer preparation method special for marine environment, which are high in efficiency.

In order to solve the technical problems, the invention provides a coating special for a marine environment, which sequentially comprises an electro-galvanizing layer, a zinc series phosphating layer, a zinc-rich primer layer and a finish paint layer from inside to outside.

As an improvement to a marine environment specific coating of the present invention:

the thickness of the first zinc electroplating layer is 20 +/-3 microns;

the thickness of the second zinc series phosphate coating is 15 +/-2 microns;

the thickness of the third zinc-rich base powder layer is 100 +/-10 microns;

the thickness of the fourth finishing paint layer is 70 +/-20 microns.

As an improvement to a marine environment specific coating of the present invention:

the surface paint layer is a hydroxyl polyester + TGIC thermosetting powder coating.

As an improvement to a marine environment specific coating of the present invention:

and dip-coating the third zinc-rich primer layer by using a fluidized bed.

As an improvement to a marine environment specific coating of the present invention:

and after the first zinc electroplating layer is finished, placing for 12-24 hours to plate a second zinc series phosphating layer.

The invention also provides a special coating for marine environment, wherein the coating of the zinc-rich primer layer comprises or consists of the following mixture of substances, wherein the weight percentages are relative to the total weight of the composition:

a resin; the weight percentage is 50 percent;

a curing agent; the weight percentage is 2.5 percent;

zinc oxide; the weight percentage is 46 percent;

leveling agent; the weight percentage is 1 percent;

benzoin; the weight percentage is 0.5%.

As an improvement to the marine environment-specific coating of the present invention:

the resin is 604 epoxy resin;

the curing agent is dicyandiamide curing agent.

The invention also provides a preparation method of the special coating for the marine environment, which comprises the following steps:

1) electroplating zinc on the surface of the workpiece to form a first zinc electroplating layer;

2) carrying out zinc series phosphating on the workpiece obtained in the step 1) by using a zinc series phosphating solution to form a second zinc series phosphating layer;

3) dip-coating the workpiece obtained in the step 2) by using zinc-rich base powder to form a third zinc-rich base powder layer;

4) and painting the workpiece obtained in the step 3) to form a fourth finish paint layer.

The special coating and the coating for the marine environment and the preparation method of the coating have the technical advantages that:

1) the invention adopts an anti-corrosion formula, has excellent salt spray resistance and is suitable for marine environment.

2) The invention uses dip coating instead of spraying construction, thereby avoiding dead angle and missing spraying and eliminating the weakest link.

3) The invention adopts the three-Ming's method, makes four layers of different coatings, has multiple proper thicknesses, has better anti-corrosion effect than simple thick coating, and particularly adds a second zinc phosphating layer in the middle to multiply the adhesive force, the sealing property and the salt spray resistant time of the coating.

The neutral salt spray test of the coating of the invention can reach 4320 hours.

Detailed Description

The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.

Embodiment 1, a special coating of marine environment, the coating includes electro-galvanization zinc layer, zinc system phosphate coating, rich zinc primer layer and finish paint layer from inside to outside in proper order.

The first zinc electroplating layer with thickness controlled at 20 +/-3 microns is placed for 12-24 hours to plate a second zinc series phosphating layer, and obvious shelling is realized after the second zinc series phosphating layer is placed for more than 24 hours;

the thickness of the second zinc series phosphating layer is controlled to be 15 +/-2 microns, the zinc series phosphating layer is placed in the second zinc series phosphating layer, the adhesion force among all coatings is optimal, and micro cracks are not easy to occur;

the third zinc-rich primer layer is dip-coated by a fluidized bed instead of a common spraying method, so that dead corners and weak points are avoided, and the thickness is controlled to be 100 +/-10 micrometers;

the fourth surface paint layer mainly plays a role in decoration and also plays a role in sealing.

The surface paint layer is a hydroxyl polyester + TGIC thermosetting powder coating, and RAL7035 ash which is most commonly used by an electric control cabinet is used, and the thickness is 70 +/-20 micrometers.

The zinc-rich base powder layer is prepared from a special coating for a marine environment, and comprises or consists of a mixture of the following substances in percentage by weight relative to the total weight of the composition:

resin: the resin is 604 epoxy resin; the weight percentage is 50 percent; mainly used for film forming and has good antiseptic effect

Curing agent: the curing agent is dicyandiamide curing agent; the weight percentage is 2.5 percent;

zinc oxide; the weight percentage is 46 percent; the coating is used for heavy corrosion prevention;

leveling agent; the weight percentage is 1 percent; for leveling the seven film;

benzoin; the weight percentage is 0.5%. For eliminating bubbles.

A preparation method of a coating special for marine environment comprises the following steps:

1) electroplating zinc on the surface of the workpiece to form a first zinc electroplating layer;

2) carrying out zinc series phosphating on the workpiece obtained in the step 1) by using a zinc series phosphating solution to form a second zinc series phosphating layer;

3) dip-coating the workpiece obtained in the step 2) by using zinc-rich base powder to form a third zinc-rich base powder layer;

gaps and cracks generated by spraying are prevented, and the invention adopts dip coating instead of spraying; the dip coating mode is fluidized bed dip coating.

4) And painting the workpiece obtained in the step 3) to form a fourth finish paint layer.

Finally, it is also noted that the above-mentioned lists merely illustrate a few specific embodiments of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.