Anti-corrosion temperature-resistant anti-drag coating and preparation method thereof

Abstract

The invention discloses a corrosion-resistant temperature-resistant drag-reducing coating and a preparation method thereof, and the corrosion-resistant temperature-resistant drag-reducing coating is a modified resin coating obtained by carrying out crosslinking modification on epoxy resin and polyurethane and then adding a structure optimization component and a sealing component. The corrosion-resistant, temperature-resistant and resistance-reducing coating provided by the invention is stable in performance and higher in strength after being sprayed to form a film, and has certain toughness and excellent chemical corrosion resistance at the same time; under the condition of high temperature, the coating is not easy to soften, deform or crack, is not easy to harden at low temperature, can keep good mechanical properties, is low in roughness, and has good wear resistance and aging resistance; and good anti-corrosion and anti-drag performance can be provided for a fluid medium conveying pipeline within the temperature range of 0-100 DEG C.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline lining coatings and relates to an anti-corrosion, temperature-resistant and drag-reducing coating and a preparation method thereof. Background Art

[0002] At present, epoxy resin has good bonding ability and high temperature resistance, and polyurethane has good toughness, oil resistance, and aging resistance, so these two materials are widely used in pipeline lining coatings. However, epoxy resin has weak resistance to cold and hot changes, is prone to cracks, has high roughness, and the hardness of the colloid after curing is high and brittle. The adhesion to the inner wall or lining of the metal pipe becomes poor, and the coating is prone to crusting and falling off. The detached area produced by the detached coating will produce greater resistance to the fluid, and the corrosion rate will be further accelerated, which will have a serious impact on the anti-corrosion performance of the metal pipeline coating and the drag reduction performance of the fluid. Polyurethane has the disadvantages of poor water resistance and heat resistance, high roughness, and relatively weak adhesion. Summary of the invention

[0003] In order to solve the shortcomings of epoxy resin and polyurethane coatings in the corrosion resistance and drag reduction performance of metal pipelines, the present invention provides an anti-corrosion, temperature-resistant and drag-reducing coating and a preparation method thereof, which can provide good corrosion resistance and drag reduction performance for fluid medium transportation pipelines in the range of 0°C to 100°C.

[0004] The present invention is achieved through the following technical solutions:

[0005] An anti-corrosion, temperature-resistant and drag-reducing coating, the raw material components of which are calculated by mass percentage:

[0006] Epoxy resin 50%-70%;

[0007] Polyurethane 9%-40%;

[0008] Cross-linking agent 5%-10%;

[0009] Defoaming agent 0.5%-1%;

[0010] Polyisobutylene 5%-10%.

[0011] The cross-linking agent is one or two of diethylenetriamine and dimethylformamide; the defoaming agent is an organosilicon defoaming agent; and the molecular weight of the polyisobutylene does not exceed 5000.

[0012] Further, in terms of mass percentage, the raw material components include:

[0013] Epoxy resin 50%-60%;

[0014] Polyurethane 21.2%-39.5%;

[0015] Cross-linking agent 5%-10%;

[0016] Defoaming agent 0.5%-1%;

[0017] Polyisobutylene 5%-10%.

[0018] Further, in terms of mass percentage, the raw material components include:

[0019] Epoxy resin 60%-70%;

[0020] Polyurethane 9%-21.2%;

[0021] Cross-linking agent 5%-10%;

[0022] Defoaming agent 0.5%-1%;

[0023] Polyisobutylene 5%-10%.

[0024] A method for preparing an anti-corrosion, temperature-resistant and drag-reducing coating comprises the following operations:

[0025] 1) Add 5%-10% of the cross-linking agent to the reactor by mass percentage, and heat the system temperature to 55-65°C;

[0026] 2) Add 50%-70% epoxy resin and 9%-40% polyurethane in sequence; maintain the system temperature at 55-65°C, stir well, and react for at least 2 hours;

[0027] 3) Add 0.5%-1% of defoamer and 5%-10% of polyisobutylene into the reactor in sequence; stir thoroughly for at least 30 minutes, and obtain the anti-corrosion, temperature-resistant and drag-reducing coating.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] The anti-corrosion, temperature-resistant and drag-reducing coating provided by the present invention is a modified resin coating obtained by cross-linking and modifying epoxy resin and polyurethane, and then adding a defoaming agent and a sealing component with optimized structure. The coating after spraying has the characteristics of good mechanical properties and chemical resistance and excellent drag reduction performance, and effectively makes up for the performance shortcomings of existing epoxy resin coatings such as poor toughness, easy aging, poor wear resistance, and poor acid and alkali resistance, temperature sensitivity, poor adhesion, and poor drag reduction ability of polyurethane, and has broad application space in metal pipeline production.

[0030] The anti-corrosion, temperature-resistant and drag-reducing coating provided by the present invention has stable performance after spraying and film formation, higher strength and certain toughness, and excellent chemical corrosion resistance; the coating is not easy to soften, deform or crack under high temperature conditions, and is not easy to harden at low temperatures, and can maintain good mechanical properties, low roughness, and has good wear resistance and aging resistance; it can provide good anti-corrosion and drag-reducing performance for fluid medium conveying pipelines within the range of 0°C to 100°C;

[0031] The anti-corrosion, temperature-resistant and drag-reducing coating provided by the present invention is a high-performance anti-corrosion, temperature-resistant and drag-reducing coating that is resistant to temperature fluctuations, has mechanical properties, excellent anti-corrosion properties and drag-reducing properties, and can be used as an inner coating for pipelines that transport fluid media. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the embodiments, which are intended to explain the present invention rather than to limit it.

[0033] Aiming at the performance defects of epoxy resin and polyurethane after spraying film, the present invention proposes to modify epoxy resin and polyurethane:

[0034] Epoxy resin has a pair of epoxy groups with high reaction activity. Under the conditions of cross-linking agent and heating, the epoxy groups can make the hydrogen atoms in the hydroxyl group in polyurethane react with the oxygen atoms in the epoxy group. During the reaction, the epoxy groups in the epoxy resin are first activated, making them more reactive; then, the epoxy groups in the epoxy resin undergo a ring-opening reaction with the hydroxyl group in the polyurethane to generate intermediate products with carbon-oxygen bonds; these intermediate products are cross-linked, so that the epoxy resin and the polyurethane form a stable three-dimensional network cross-linked structure, forming new bonds between atoms and carbon atoms, and generating new modified resin materials.

[0035] In addition, the present invention also mixes a defoaming agent and a low molecular weight polyisobutylene sealant with the modified resin material to optimize the structure, thereby obtaining the anti-corrosion, temperature-resistant and drag-reducing coating of the present invention.

[0036] The anticorrosion, temperature-resistant and drag-reducing coating provided by the present invention comprises the following raw material components:

[0037] Epoxy resin 50%-70%;

[0038] Polyurethane 9%-40%;

[0039] Cross-linking agent (diethylenetriamine, dimethylformamide) 5%-10%;

[0040] Defoamer (organic silicon defoamer, used for coating structure optimization) 0.5%-1%;

[0041] Sealant (5000 molecular weight polyisobutylene) 5%-10%.

[0042] When in use, the spraying thickness of the anti-corrosion, temperature-resistant and drag-reducing coating is 1100-1500μm.

[0043] The method for preparing the anticorrosion, temperature-resistant and drag-reducing coating of the present invention comprises the following steps:

[0044] 1) Turn on the stirrer, add the crosslinking agent into the reactor according to the formula, and heat the system temperature to 60±5℃;

[0045] 2) Add epoxy resin and polyurethane in sequence according to the formula while maintaining the system temperature at 60±5°C; maintain the system temperature at 60±5°C, stir thoroughly, and react for at least 2 hours;

[0046] 3) adding defoamer and polyisobutylene with a molecular weight of 5000 into the reactor in sequence;

[0047] 4) After stirring for 30 minutes, the material is discharged to obtain an anti-corrosion, temperature-resistant and drag-reducing coating.

[0048] The coating was performed using a sprayer with a coating thickness of 1300 μm.

[0049] The following three example formulas are used to produce anti-corrosion, temperature-resistant and drag-reducing coatings, and their performance is tested:

[0050] Example 1

[0051] The raw material formula of the anti-corrosion, temperature-resistant and drag-reducing coating is as follows:

[0052] Cross-linking agent 5%, epoxy resin 50%, polyurethane 39.5%, defoaming agent 0.5%, polyisobutylene 5%;

[0053] The preparation method comprises the following operations:

[0054] 1) Turn on the stirrer, set the speed to 150r / min, add 5% of the crosslinking agent diethylenetriamine into the reactor, and heat the system temperature to 60±5°C;

[0055] 2) Add 50% epoxy resin and 39.5% polyurethane in sequence while maintaining the system temperature at 60±5°C; maintain the system temperature at 60±5°C, stir, and react for 2 hours;

[0056] 3) Add 0.5% of silicone defoamer and 5% of polyisobutylene with a molecular weight of 5000 into the reactor.

[0057] 4) After stirring for 30 minutes, the material is discharged to obtain an anti-corrosion, temperature-resistant and drag-reducing coating.

[0058] The coating was performed using a sprayer with a coating thickness of 1300 μm.

[0059] Example 2

[0060] The raw material formula of the anti-corrosion, temperature-resistant and drag-reducing coating is as follows:

[0061] Crosslinking agent 10%, epoxy resin 60%, polyurethane 21.2%, defoaming agent 0.8%, polyisobutylene 8%;

[0062] The preparation method comprises the following operations:

[0063] 1) Turn on the stirrer and set the speed to 150r / min, add 5% of crosslinking agent diethylenetriamine and 5% of dimethylformamide into the reactor, and heat the system temperature to 60±5°C;

[0064] 2) Add 60% epoxy resin and 21.2% polyurethane in sequence while maintaining the system temperature at 60±5°C; maintain the system temperature at 60±5°C, stir, and react for 2 hours;

[0065] 3) Add 0.8% of organosilicon defoamer and 8% of polyisobutylene with a molecular weight of 5000 into the reactor.

[0066] 4) After stirring for 30 minutes, the material is discharged to obtain an anti-corrosion, temperature-resistant and drag-reducing coating.

[0067] The coating was performed using a sprayer with a coating thickness of 1300 μm.

[0068] Example 3

[0069] The raw material formula of the anti-corrosion, temperature-resistant and drag-reducing coating is as follows:

[0070] Cross-linking agent 10%, epoxy resin 70%, polyurethane 9%, defoaming agent 1%, polyisobutylene 10%;

[0071] The preparation method comprises the following operations:

[0072] 1) Turn on the stirrer, set the speed to 150r / min, add 10% of dimethylformamide, a crosslinking agent, into the reactor, and heat the system to 60±5°C;

[0073] 2) Add 70% epoxy resin and 9% polyurethane in sequence while maintaining the system temperature at 60±5°C; maintain the system temperature at 60±5°C, stir, and react for 2 hours;

[0074] 3) Add 1% of silicone defoamer and 10% of polyisobutylene with a molecular weight of 5000 into the reactor.

[0075] 4) After stirring for 30 minutes, the material is discharged to obtain an anti-corrosion, temperature-resistant and drag-reducing coating.

[0076] The coating was performed using a sprayer with a coating thickness of 1300 μm.

[0077] The coatings prepared in the above three embodiments and epoxy resin and polyurethane coatings of the same thickness were sprayed on the cement mortar lining layer on the inner wall of the metal pipe; chemical resistance, adhesion, wear resistance, aging resistance and roughness tests were carried out according to GB / T 24596 and GB / T 1031-2009 standards, and the test and comparison data are shown in Table 1.

[0078] Table 1 Comparison of the coating of the present invention with epoxy resin and polyurethane coatings of the same thickness

[0079]

[0080] The present invention prepares a novel modified resin coating by cross-linking and modifying the existing epoxy resin and polyurethane, and then adding a structure optimization component and a sealing component; the coating after spraying has the characteristics of good mechanical properties, chemical resistance and excellent drag reduction performance, and effectively makes up for the performance shortcomings of the existing epoxy resin coating, such as poor toughness, easy aging, poor wear resistance, and the poor acid and alkali resistance, temperature sensitivity, poor adhesion, and poor drag reduction ability of polyurethane, and has a broad application space in the production of metal pipes.

[0081] The above embodiments are preferred examples for implementing the present invention, and the present invention is not limited to the above embodiments. Any non-essential additions and substitutions made by those skilled in the art based on the technical features of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. An anti-corrosion, temperature-resistant and drag-reducing coating, characterized in that: In terms of mass percentage, the raw material components include: Epoxy resin 50%-70%; Polyurethane 9%-40%; Cross-linking agent 5%-10%; Defoaming agent 0.5%-1%; Polyisobutylene 5%-10%.

2. The anti-corrosion, temperature-resistant and drag-reducing coating according to claim 1, characterized in that: The cross-linking agent is one or two of diethylenetriamine and dimethylformamide; the defoaming agent is an organosilicon defoaming agent; and the molecular weight of the polyisobutylene does not exceed 5000.

3. The anticorrosion, temperature-resistant and drag-reducing coating according to claim 1 or 2, characterized in that: In terms of mass percentage, the raw material components include: Epoxy resin 50%-60%; Polyurethane 21.2%-39.5%; Cross-linking agent 5%-10%; Defoaming agent 0.5%-1%; Polyisobutylene 5%-10%.

4. The anticorrosion, temperature-resistant and drag-reducing coating according to claim 1 or 2, characterized in that: In terms of mass percentage, the raw material components include: Epoxy resin 60%-70%; Polyurethane 9%-21.2%; Cross-linking agent 5%-10%; Defoaming agent 0.5%-1%; Polyisobutylene 5%-10%.

5. A method for preparing an anticorrosion, temperature-resistant and drag-reducing coating, characterized in that: The following operations are included: 1) Add 5%-10% of the cross-linking agent to the reactor by mass percentage, and heat the system temperature to 55-65°C; 2) Add 50%-70% epoxy resin and 9%-40% polyurethane in sequence; maintain the system temperature at 55-65°C, stir well, and react for at least 2 hours; 3) Add 0.5%-1% of defoamer and 5%-10% of polyisobutylene into the reactor in sequence; stir thoroughly for at least 30 minutes, and obtain the anti-corrosion, temperature-resistant and drag-reducing coating.

6. The method for preparing the anticorrosion, temperature-resistant and drag-reducing coating according to claim 5, characterized in that: The cross-linking agent is one or two of diethylenetriamine and dimethylformamide; the defoaming agent is an organosilicon defoaming agent; and the molecular weight of the polyisobutylene does not exceed 5000.

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