阅读说明：本技术 一种舷外冷却器外热酚醛树脂保护涂层及其制备方法 (Outboard cooler external thermal phenolic resin protective coating and preparation method thereof ) 是由 王晓东 于 2019-12-03 设计创作，主要内容包括：本发明公开了一种舷外冷却器外热酚醛树脂保护涂层及其制备方法,包括如下热喷涂步骤：(1)对舷外冷却器管组的表面进行除油处理；(2)将热固性酚醛树脂材料热喷涂到舷外冷却器的管组表面,堆积形成防腐层；(3)对防腐层进行密封处理。本发明中,首先钛制舷外冷却器管组外表面热喷涂酚醛树脂可以降低船舱受电位腐蚀的风险。由于钛表面有稳定的钝化膜,在海水中钛相对于铜更不易使碳钢船体受到电偶腐蚀。对此,在钛管组表面热喷涂一定厚度的酚醛树脂油漆后,使管组与船体物理隔离,降低船体受到电偶腐蚀的风险；其次钛管组热喷涂酚醛树脂后,海生物不易附着,同时也起到保护钛管的作用。(The invention discloses an outboard cooler external thermal phenolic resin protective coating and a preparation method thereof, wherein the preparation method comprises the following thermal spraying steps: (1) carrying out oil removal treatment on the surface of the outboard cooler pipe group; (2) thermally spraying a thermosetting phenolic resin material on the surface of a pipe group of the outboard cooler, and stacking to form an anticorrosive layer; (3) and sealing the anticorrosive layer. According to the invention, firstly, the phenolic resin is thermally sprayed on the outer surface of the titanium outboard cooler pipe group, so that the risk of the cabin being subjected to potential corrosion can be reduced. Because the titanium surface has a stable passive film, the carbon steel hull is less prone to galvanic corrosion by titanium in seawater compared with copper. In contrast, after phenolic resin paint with a certain thickness is thermally sprayed on the surface of the titanium pipe group, the pipe group is physically isolated from the ship body, and the risk of galvanic corrosion on the ship body is reduced; and secondly, after the titanium tube group is thermally sprayed with phenolic resin, marine organisms are not easy to attach, and the titanium tube group also plays a role in protecting the titanium tube.)

1. The protective coating of the outboard thermal phenolic resin of the outboard cooler is characterized by comprising the following thermal spraying steps:

(1) carrying out oil removal treatment on the surface of the outboard cooler pipe group;

(2) thermally spraying a thermosetting phenolic resin material on the surface of a pipe group of the outboard cooler, and stacking to form an anticorrosive layer;

(3) and sealing the anticorrosive layer.

2. The outboard cooler outboard thermal phenolic resin protective coating of claim 1, wherein the thermal spray coating is applied by: melting the thermosetting phenolic resin material by adopting plasma flame, atomizing the melted liquid phenolic resin material by compressed air, spraying the atomized liquid phenolic resin material to the surface of the pipe group, and accumulating to form a coating;

the process conditions of plasma flame spraying are as follows:

plasma gas: nitrogen is 0.5-0.6 Mpa; voltage value: 150-200V; current value: 120-220 amperes; spraying distance: 80-160 mm; spraying angle: 60-80 degrees.

3. The protective coating of the outboard hot phenolic resin of claim 1, wherein the thickness of the corrosion protection layer is 0.3-0.5 mm.

4. A preparation method of an outboard cooler external thermal phenolic resin protective coating is characterized by comprising the following preparation steps:

(1) respectively weighing phenol and aldehyde raw materials according to a molar ratio of 1: 1.1-1.8, and weighing a catalyst according to a mass ratio of the catalyst to the phenol of 1-3.5: 100;

(2) respectively adding phenol, aldehyde and a catalyst into an intermittent reaction kettle, adding a proper amount of water, and heating the reaction kettle to control the water temperature to be 80-90 ℃, wherein the proper amount of water is 1.5-2.0 times of the total mass of the aldehyde;

(3) maintaining the mixture in the reaction kettle to react at 84-87 ℃, and performing reduced pressure dehydration when the concentration of free phenol is 1-5 wt%;

(4) and stopping dehydrating when the adhesion degree of the reactants is detected to be 1000-1600 mPas in the dehydration process, so as to obtain the thermosetting phenolic resin material.

5. The method for preparing the protective coating of the phenolic resin for the outboard cooler of claim 4, wherein the phenol is one or more of phenol, cresol, xylenol, nonylphenol, resorcinol and cardanol.

6. The method of claim 4, wherein the aldehyde is selected from the group consisting of formaldehyde, acetaldehyde, and butyraldehyde in solid polymer form.

7. The method for preparing the protective coating of the outboard cooler outboard thermal phenolic resin as claimed in claim 4, wherein the catalyst is selected from one or more of ammonia, sodium hydroxide, magnesium hydroxide and barium hydroxide.

Technical Field

The invention relates to the technical field of marine cooler processing, in particular to an outboard cooler external thermal phenolic resin protective coating and a preparation method thereof.

Background

Outboard coolers are currently widely used on ships such as tugboats, barges, fishermen, transport boats, dredge boats, tender boats, ferries, cargo ships, tanker ships, reefers, icebreakers and the like in inland rivers and seas. Compared with other cooling systems, such as plate heat exchangers or conventional shell-and-tube coolers, the box cooler has the advantages that no extra-ship secondary cooling water pipeline is adopted, so that parts needing maintenance, such as cooling water pumps, filters, valve parts, pipelines and the like, are not needed, and compared with other schemes, the box cooler is not easy to corrode and attach to marine organisms and saves energy. In a conventional cooling water system, a secondary pump of about 15 kilowatts consumes about 3 liters of oil per hour, and an average operation of 5000 hours per year results in a saving of 15000 liters of oil. Box coolers are best suited for working in areas with ice, narrow mud or dirt. In fact, the box cooler is not serviced and therefore operates at a lower cost than any other cooling system.

However, the existing outboard cooler still has the defects that the outer surface of the titanium tube group of the existing outboard cooler is not coated, so that the titanium tube group and the carbon steel hull form a galvanic cell to form galvanic corrosion on the carbon steel hull. Shipyards may be additionally equipped with sacrificial anodes, but only offer partial protection or consume too quickly, and stray currents may also cause pitting of the tube bundle; or the impressed cathodic current protection is complex in equipment and construction and needs to be supervised by people.

Disclosure of Invention

The invention aims to solve the problem that the ship body is easy to corrode because the outer surface of a titanium tube group of the conventional outboard cooler is not subjected to coating treatment, and provides an outboard hot phenolic resin protective coating of the outboard cooler and a preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

an outboard cooler outboard thermal phenolic resin protective coating comprising the steps of:

(1) carrying out oil removal treatment on the surface of the outboard cooler pipe group;

(2) thermally spraying a thermosetting phenolic resin material on the surface of a pipe group of the outboard cooler, and stacking to form an anticorrosive layer;

(3) and sealing the anticorrosive layer.

As a further description of the above technical solution:

the thermal spraying method comprises the following steps: melting the thermosetting phenolic resin material by adopting plasma flame, atomizing the melted liquid phenolic resin material by compressed air, spraying the atomized liquid phenolic resin material to the surface of the pipe group, and accumulating to form a coating;

the process conditions of plasma flame spraying are as follows:

plasma gas: nitrogen is 0.5-0.6 Mpa; voltage value: 150-200V; current value: 120-220 amperes; spraying distance: 80-160 mm; spraying angle: 60-80 degrees.

As a further description of the above technical solution:

the thickness of the anticorrosive coating is 0.3-0.5 mm.

As a further description of the above technical solution:

the preparation method of the protective coating of the outboard thermal phenolic resin of the outboard cooler comprises the following preparation steps:

(1) respectively weighing phenol and aldehyde raw materials according to a molar ratio of 1: 1.1-1.8, and weighing a catalyst according to a mass ratio of the catalyst to the phenol of 1-3.5: 100;

(2) respectively adding phenol, aldehyde and a catalyst into an intermittent reaction kettle, adding a proper amount of water, and heating the reaction kettle to control the water temperature to be 80-90 ℃, wherein the proper amount of water is 1.5-2.0 times of the total mass of the aldehyde;

(3) maintaining the mixture in the reaction kettle to react at 84-87 ℃, and performing reduced pressure dehydration when the concentration of free phenol is 1-5 wt%;

(4) and stopping dehydrating when the adhesion degree of the reactants is detected to be 1000-1600 mPas in the dehydration process, so as to obtain the thermosetting phenolic resin material.

As a further description of the above technical solution:

the phenol is one or more of phenol, cresol, xylenol, nonylphenol, resorcinol or cardanol.

As a further description of the above technical solution:

the aldehyde is one or a mixture of formaldehyde, acetaldehyde or butyraldehyde solid polymer.

As a further description of the above technical solution:

the catalyst is one or a mixture of more of ammonia water, sodium hydroxide, magnesium hydroxide and barium hydroxide.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. according to the invention, firstly, the phenolic resin is thermally sprayed on the outer surface of the titanium outboard cooler pipe group, so that the risk of the cabin being subjected to potential corrosion can be reduced. Because the titanium surface has a stable passive film, the carbon steel hull is less prone to galvanic corrosion by titanium in seawater compared with copper. In contrast, after phenolic resin paint with a certain thickness is thermally sprayed on the surface of the titanium pipe group, the pipe group is physically isolated from the ship body, and the risk of galvanic corrosion on the ship body is reduced; and secondly, after the titanium tube group is thermally sprayed with phenolic resin, marine organisms are not easy to attach, and the titanium tube group also plays a role in protecting the titanium tube.

2. In the invention, the intermittent reaction kettle is used, so that the reaction end point is convenient to control, and the gel in the reaction kettle is prevented from forming a pot.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.