High-temperature-resistant anticorrosive paint and preparation method thereof

Abstract

The application relates to a high-temperature-resistant anticorrosive paint and a preparation method thereof, which comprises the following components in parts by weight: high-chlorinated polyethylene 15-20 parts, epoxy resin 5-10 parts, organic fluorine epoxy resin 0.5-1 part, linseed oil 6-8 parts, acrylic ester 10-15 parts, plasticizer 6-8 parts, filler 10-40 parts, 325-mesh glass flake 0-15, solvent 50-60 parts, anti-settling agent 3-5 parts, and rutile titanium dioxide 1-10 parts. Compared with the traditional topcoat adopting the high-chlorinated polyethylene anticorrosive paint, the topcoat of the application adopts the combination of high-chlorinated polyethylene, linoleic acid, epoxy resin and acrylic ester, and the salt water resistance, alkali resistance and salt mist resistance are greatly improved.

Description

Technical Field

[0001] This invention relates to a high-temperature resistant anti-corrosion coating and its preparation method, belonging to the field of anti-corrosion coatings. Background Technology

[0002] High-chlorinated polyethylene coatings are composed of high-chlorinated polyethylene resin, plasticizers, synthetic resins, inert pigments and additives, and solvents. This coating dries by solvent evaporation, resulting in rapid drying. It can be applied at any temperature and exhibits excellent mechanical and physical properties, particularly superior elasticity and cold resistance. It also possesses excellent weather resistance, ozone resistance, water resistance, acid and alkali resistance, and chemical resistance. Widely used on the surfaces of various light and heavy metals and cement structures, both indoors and outdoors, it provides rust and corrosion protection. It can be applied to railway bridges, high-voltage transmission towers, containers, offshore drilling and oil production equipment, various vehicle chassis, heavy machinery, ship hulls, equipment, and pipelines operating in diverse environments.

[0003] However, the following problems exist: (1) Chlorinated polyolefin polymers tend to dehydrate under the action of heat and light. The generated HCl further promotes the degradation and destruction of the resin. Therefore, a small amount of epichlorohydrin or low molecular weight epoxy resin is added to HCPE anticorrosion paint as a stabilizer to absorb the generated HCl. However, the effect of the added stabilizer is generally poor, especially in the case of high outdoor temperature in summer, the anticorrosion effect of the coating is not good.

[0004] (2) In addition, as the chlorine content of HCPE increases, the flexibility and impact resistance of the coating film are poor. Although toughening agents can be added to improve it, the effect is generally not good at high temperatures. Summary of the Invention

[0005] This invention provides a high-temperature resistant anti-corrosion coating and its preparation method, which solves the problems of poor corrosion resistance, flexibility and impact resistance of existing high-chlorinated polyethylene coatings under high-temperature environments.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A high-temperature resistant and anti-corrosion coating, by weight, comprises 15-20 parts of high-chlorinated polyethylene, 5-10 parts of epoxy resin, 0.5-1 parts of organic fluorine epoxy resin, 6-8 parts of linseed oil, 10-15 parts of acrylate, 6-8 parts of plasticizer, 10-40 parts of filler, 0-15 parts of 325-mesh glass flakes, 50-60 parts of solvent, 3-5 parts of anti-settling agent, and 1-10 parts of rutile titanium dioxide.

[0008] Furthermore, preferably: the high-temperature resistant anti-corrosion coating is a topcoat, comprising, by weight, 15-20 parts of high-chlorinated polyethylene, 5-10 parts of epoxy resin, 0.5-1 parts of organic fluorine epoxy resin, 6-8 parts of linseed oil, 10-15 parts of acrylate, 6-8 parts of plasticizer, 10-15 parts of filler, 10-15 parts of 325-mesh glass flakes, 50-60 parts of solvent, 3-5 parts of anti-settling agent, and 6-10 parts of rutile titanium dioxide.

[0009] Furthermore, preferably: the high-temperature resistant anti-corrosion coating is a primer, comprising, by weight, 15-20 parts of high-chlorinated polyethylene, 5-10 parts of epoxy resin, 0.5-1 parts of organic fluorine epoxy resin, 6-8 parts of linseed oil, 10-15 parts of acrylate, 6-8 parts of plasticizer, 30-40 parts of filler, 0 parts of 325-mesh glass flakes, 50-60 parts of solvent, 3-5 parts of anti-settling agent, and 1-3 parts of rutile titanium dioxide.

[0010] Furthermore, preferably: the high-chlorinated polyethylene is HCPE-65M, the epoxy resin is E51 or E44, and the acrylate is AR511.

[0011] Furthermore, preferably, the plasticizer is chlorinated paraffin. This plasticizer is simple to use in HCPE resin coatings, facilitates paint preparation, and has the characteristics of flame retardancy and good compatibility with HCPE resin.

[0012] Furthermore, preferably, the filler comprises precipitated barium sulfate, silica, and calcium stearate in a weight ratio of precipitated barium sulfate: silica: calcium stearate of 15:3:2.

[0013] Calcium stearate can form a stable complex with chloride ions, which can effectively inhibit the precipitation of chloride ions.

[0014] Furthermore, preferably, the solvent is xylene and a high-boiling-point aromatic solvent in a weight ratio of 6:4.

[0015] Furthermore, preferably, the anti-settling agent is bentonite.

[0016] The present invention relates to a method for preparing a high-temperature resistant and anti-corrosion coating.

[0017] (1) Add high-boiling-point aromatic solvent to the reaction vessel, then add high-chlorinated polyethylene, epoxy resin, organic fluorine epoxy resin, linseed oil and acrylate and mix evenly. Heat to 80-100℃ and react for 3-5 hours. Then cool to room temperature and set aside.

[0018] (2) Mix the filler, anti-settling agent, rutile titanium dioxide and the product obtained in step (1) evenly, then add plasticizer and xylene, and grind to the required fineness;

[0019] (3) Finally, add 325-mesh glass flakes, disperse at high speed for 20 min, filter through a 40-mesh sieve, and pack into a barrel.

[0020] Furthermore, preferably, the grinding temperature is 30-50°C.

[0021] The beneficial effects of this invention are:

[0022] The addition of linseed oil can increase the flexibility and ductility of polyethylene substrates, making them more suitable for bending and deformation, and effectively improving the toughness of coatings; it can also improve the heat resistance of high-chlorinated polyethylene, enabling it to maintain good stability in high-temperature environments; it can increase the impact resistance of high-chlorinated polyethylene, making it more resistant to external impacts and stress; and the high-chlorinated polyethylene modified with linseed oil has better weather resistance, resisting the effects of ultraviolet radiation, oxidation, and climate change on material properties.

[0023] Epoxy resins and fluorinated epoxy resins possess excellent chemical stability, effectively resisting corrosion from acids, alkalis, and other chemicals, thus improving the corrosion resistance of high-chlorinated polyethylene (HPE) at high temperatures. Epoxy resins and fluorinated epoxy resins also exhibit high thermal stability, maintaining good performance even at high temperatures. Composites with these resins enhance the high-temperature resistance of HPE, enabling it to be used stably for extended periods at high temperatures without deformation or embrittlement.

[0024] Acrylic esters are high-molecular-weight elastomer materials with excellent strength and toughness. Composite acrylic esters can enhance the mechanical properties of high-chlorinated polyethylene, making it more heat-resistant and impact-resistant.

[0025] Rutile titanium dioxide, primarily composed of titanium dioxide, is non-toxic and chemically stable. It hardly reacts with other substances at room temperature and is a slightly acidic amphoteric oxide. Titanium dioxide has excellent UV-blocking capabilities, helping to protect coatings from UV radiation damage. This contributes to improved weather resistance and extended coating lifespan.

[0026] The addition of silica and titanium dioxide can increase the hardness and abrasion resistance of the coating, making it more durable and able to withstand more physical damage and wear. Silica and titanium dioxide can form a uniform filler structure in the coating, which helps improve the adhesion between the coating and the substrate, thereby enhancing the coating's adhesion. Detailed Implementation

[0027] The technical solutions in this embodiment will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] A high-temperature resistant and anti-corrosion coating, by weight, comprises 15 parts of high-chlorinated polyethylene, 6 parts of epoxy resin, 0.6 parts of organic fluorine epoxy resin, 7 parts of linseed oil, 12 parts of acrylate, 6 parts of plasticizer, 10 parts of filler, 10 parts of 325-mesh glass flakes, 50 parts of solvent, 3 parts of anti-settling agent, and 8 parts of rutile titanium dioxide.

[0030] The high-chlorinated polyethylene is HCPE-65M, the epoxy resin is E44, and the acrylate is AR511. The plasticizer is chlorinated paraffin, specifically 52# chlorinated paraffin. The filler includes precipitated barium sulfate, silica, and calcium stearate in a weight ratio of 15:3:2. The solvent is xylene and a high-boiling-point aromatic solvent in a weight ratio of 6:4. SA1500 is used as the high-boiling-point aromatic solvent. The anti-settling agent is bentonite; coating-grade bentonite is sufficient.

[0031] The organic fluorine epoxy resin can be any one of bisphenol hexafluoropropane diglycidyl ether (DGEBHFA), 1,4-bis(hydroxyhexafluoroisopropyl)phenyl diglycidyl ether, or 4,4'-dihydroxyoctafluorobiphenyl diglycidyl ether. In the embodiments of the present invention, bisphenol hexafluoropropane diglycidyl ether (DGEBHFA) is used.

[0032] The preparation method includes the following steps: (1) Add high-boiling-point aromatic solvent to the reaction vessel, then add high-chlorinated polyethylene, epoxy resin, organic fluorine epoxy resin, linseed oil and acrylate, mix evenly, heat to 80°C, react for 5 hours, then cool to room temperature for later use;

[0033] (2) Mix the filler, anti-settling agent and rutile titanium dioxide with the product obtained in step (1) evenly, then add plasticizer and xylene, and grind until the fineness is 40 μm;

[0034] (3) Finally, add 325-mesh glass flakes, disperse at high speed for 20 min, filter through a 40-mesh sieve, and pack into a barrel.

[0035] During the grinding process, the grinding temperature is 40℃.

[0036] Example 2

[0037] A high-temperature resistant and anti-corrosion coating, by weight, comprises 16 parts of high-chlorinated polyethylene, 5 parts of epoxy resin, 0.5 parts of organic fluorine epoxy resin, 7 parts of linseed oil, 10 parts of acrylate, 7 parts of plasticizer, 15 parts of filler, 13 parts of 325-mesh glass flakes, 55 parts of solvent, 4 parts of anti-settling agent, and 10 parts of rutile titanium dioxide.

[0038] The high-chlorinated polyethylene is HCPE-65M, the epoxy resin is E44, and the acrylate is AR511. The plasticizer is chlorinated paraffin, specifically 52# chlorinated paraffin. The filler includes precipitated barium sulfate, silica, and calcium stearate in a weight ratio of 15:3:2. The solvent is xylene and a high-boiling-point aromatic solvent in a weight ratio of 6:4. The high-boiling-point aromatic solvent used is SA1500. The anti-settling agent is bentonite.

[0039] The preparation method includes the following steps: (1) Add high-boiling-point aromatic solvent to the reaction vessel, then add high-chlorinated polyethylene, epoxy resin, organic fluorine epoxy resin, linseed oil and acrylate, mix evenly, heat to 100°C, react for 3 hours, then cool to room temperature for later use.

[0040] (2) Mix the filler, anti-settling agent and rutile titanium dioxide with the product obtained in step (1) evenly, then add plasticizer and xylene, and grind until the fineness is 40 μm;

[0041] (3) Finally, add 325-mesh glass flakes, disperse at high speed for 20 min, filter through a 40-mesh sieve, and pack into a barrel.

[0042] During the grinding process, the grinding temperature is 50℃.

[0043] Example 3

[0044] A high-temperature resistant and anti-corrosion coating, by weight, comprises 18 parts of high-chlorinated polyethylene, 7 parts of epoxy resin, 0.8 parts of organic fluorine epoxy resin, 8 parts of linseed oil, 13 parts of acrylate, 8 parts of plasticizer, 20 parts of filler, 15 parts of 325-mesh glass flakes, 60 parts of solvent, 5 parts of anti-settling agent, and 6 parts of rutile titanium dioxide.

[0045] The high-chlorinated polyethylene is HCPE-65M, the epoxy resin is E44, and the acrylate is AR511. The plasticizer is chlorinated paraffin, specifically 52# chlorinated paraffin. The filler includes precipitated barium sulfate, silica, and calcium stearate in a weight ratio of 15:3:2. The solvent is xylene and a high-boiling-point aromatic solvent in a weight ratio of 6:4. The high-boiling-point aromatic solvent used is SA1500. The anti-settling agent is bentonite.

[0046] The preparation method includes the following steps: (1) Add high-boiling-point aromatic solvent to the reaction vessel, then add high-chlorinated polyethylene, epoxy resin, organic fluorine epoxy resin, linseed oil and acrylate, mix evenly, heat to 90°C, react for 4 hours, then cool to room temperature for later use;

[0047] (2) Mix the filler, anti-settling agent and rutile titanium dioxide with the product obtained in step (1) evenly, then add plasticizer and xylene, and grind until the fineness is 40 μm;

[0048] (3) Finally, add 325-mesh glass flakes, disperse at high speed for 20 min, filter through a 40-mesh sieve, and pack into a barrel.

[0049] During the grinding process, the grinding temperature is 40℃.

[0050] Example 4

[0051] The coating is basically the same as in Example 1, except that: a high-temperature resistant anti-corrosion coating, by weight, includes 16 parts of high-chlorinated polyethylene, 8 parts of epoxy resin, 1 part of organic fluorine epoxy resin, 6 parts of linseed oil, 14 parts of acrylate, 6 parts of plasticizer, 34 parts of filler, 0 parts of 325-mesh glass flakes, 50 parts of solvent, 4 parts of anti-settling agent, and 2 parts of rutile titanium dioxide.

[0052] The preparation method includes the following steps: (1) Add high-boiling-point aromatic solvent to the reaction vessel, then add high-chlorinated polyethylene, epoxy resin, organic fluorine epoxy resin, linseed oil and acrylate, mix evenly, heat to 90°C, react for 4 hours, then cool to room temperature for later use;

[0053] (2) Mix the filler, anti-settling agent and rutile titanium dioxide with the product obtained in step (1) evenly, then add plasticizer and xylene, grind to a fineness of 60 μm; filter through a 60-mesh sieve and pack into barrels.

[0054] During the grinding process, the grinding temperature is 40℃.

[0055] Example 5

[0056] It is basically the same as Example 4, except that:

[0057] A high-temperature resistant and anti-corrosion coating, by weight, comprises 20 parts of high-chlorinated polyethylene, 10 parts of epoxy resin, 0.7 parts of organic fluorine epoxy resin, 8 parts of linseed oil, 15 parts of acrylate, 8 parts of plasticizer, 40 parts of filler, 1 part of 325-mesh glass flakes, 60 parts of solvent, 5 parts of anti-settling agent, and 3 parts of rutile titanium dioxide.

[0058] Example 6

[0059] It is basically the same as Example 4, except that:

[0060] A high-temperature resistant and anti-corrosion coating, by weight, comprises 16 parts of high-chlorinated polyethylene, 9 parts of epoxy resin, 0.9 parts of organic fluorine epoxy resin, 6 parts of linseed oil, 11 parts of acrylate, 7 parts of plasticizer, 35 parts of filler, 0.1 parts of 325-mesh glass flakes, 55 parts of solvent, 3 parts of anti-settling agent, and 1 part of rutile titanium dioxide.

[0061] Comparative Example 1

[0062] The coating is basically the same as in Example 1, except that: a high-temperature resistant anti-corrosion coating, by weight, includes 18 parts of high-chlorinated polyethylene, 10 parts of epoxy resin, 0.6 parts of organic fluorine epoxy resin, 12 parts of acrylate, 6 parts of plasticizer, 10 parts of filler, 10 parts of 325-mesh glass flakes, 50 parts of solvent, 3 parts of anti-settling agent, and 8 parts of rutile titanium dioxide.

[0063] Comparative Example 2

[0064] The coating is basically the same as in Example 1, except that: a high-temperature resistant anti-corrosion coating, by weight, includes 15 parts of high-chlorinated polyethylene, 6.6 parts of epoxy resin, 7 parts of linseed oil, 12 parts of acrylate, 6 parts of plasticizer, 10 parts of filler, 10 parts of 325-mesh glass flakes, 50 parts of solvent, 3 parts of anti-settling agent, and 8 parts of rutile titanium dioxide.

[0065] Comparative Example 3

[0066] The coating is basically the same as in Example 1, except that: a high-temperature resistant anti-corrosion coating, by weight, includes 18 parts of high-chlorinated polyethylene, 10.6 parts of epoxy resin, 12 parts of acrylate, 6 parts of plasticizer, 10 parts of filler, 10 parts of 325-mesh glass flakes, 50 parts of solvent, 3 parts of anti-settling agent, and 8 parts of rutile titanium dioxide.

[0067] Comparative Example 4

[0068] It is basically the same as Example 1, except that the high-temperature reaction step (1) is not used in its preparation process, and direct mixing is adopted instead.

[0069] Comparative Example 5

[0070] The example is basically the same as Example 1, except that silica is not used in the filler; instead, precipitated barium sulfate is used instead.

[0071] Coating performance parameter determination

[0072] The high-chlorinated polyethylene anticorrosive coating prepared by this invention is used as a topcoat. The performance of the coating prepared according to HG / T 4338—2012 High-chlorinated polyethylene anticorrosive coating is shown in Tables 1 and 2 below.

[0073] Table 1. Coating performance parameters of different embodiments

[0074]

[0075] As shown in Table 1, compared with traditional anti-corrosion coatings using high-chlorinated polyethylene, the topcoat of the present invention uses a combination of high-chlorinated polyethylene, linoleic acid, epoxy resin and acrylate, which greatly improves the salt water resistance, alkali resistance and salt spray resistance. At the same time, the addition of trace amounts of organic fluorine epoxy resin and fumed silica can further improve the salt water resistance, alkali resistance and salt spray resistance of the coating.

[0076] Because of the addition of linoleic acid, if the reaction is not carried out by heating, the linoleic acid will not mix well with high-chlorinated polyethylene, epoxy resin and acrylate, resulting in a significant reduction in its performance. The paint film will show sagging, and the salt water resistance, alkali resistance and salt spray resistance will be greatly reduced. It is evident that high-temperature blending of linoleic acid with high-chlorinated polyethylene, epoxy resin and acrylate is of great significance for coatings.

[0077] Artificial climate aging plays a crucial role in coatings and is an important indicator for evaluating their quality. Current artificial climate aging tests are conducted according to Cycle A of Method 1 in GB / T 1865-2009, with a blackboard temperature of 63°C. + In this invention, the blackboard temperature was set at 60, 65 and 70°C to examine the effect of different temperatures on the coating, so as to examine the high temperature resistance of the coating. Specific data are shown in Table 2.

[0078] Table 2 Results of artificial climate aging under different blackboard temperatures

[0079]

[0080] As shown in the table above, the coating of the present invention exhibits good performance at aging blackboard temperatures between 60-70°C, and the coating does not undergo significant changes, demonstrating that the coating of the present invention has excellent high-temperature resistance.

[0081] The high-chlorinated polyethylene anticorrosive coating prepared in this invention is used as a primer. The performance of the coating prepared according to HG / T 4338—2012 High-chlorinated polyethylene anticorrosive coating is shown in Table 3 below.

[0082] Table 3. Coating performance parameters of different embodiments

[0083]

[0084] As can be seen from the table above, the coating of the present invention also has good performance as a primer, especially in terms of salt water resistance and alkali resistance.

[0085] Although embodiments of the present invention have been described above, any modifications and substitutions made by those skilled in the art without departing from the principles and spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A high-temperature resistant anti-corrosion coating, characterized in that: By weight, it includes 15-20 parts of high-chlorinated polyethylene, 5-10 parts of epoxy resin, 0.5-1 part of organic fluorine epoxy resin, 6-8 parts of linseed oil, 10-15 parts of acrylate, 6-8 parts of plasticizer, 10-40 parts of filler, 0-15 parts of 325-mesh glass flakes, 50-60 parts of solvent, 3-5 parts of anti-settling agent, and 1-10 parts of rutile titanium dioxide; The high-chlorinated polyethylene is HCPE-65M, the epoxy resin is E51 or E44, and the acrylate is AR511; the plasticizer is chlorinated paraffin; the filler includes precipitated barium sulfate, silica and calcium stearate, with a weight ratio of precipitated barium sulfate: silica: calcium stearate of 15:3:

2. Its preparation method includes the following steps: (1) Add high-boiling-point aromatic solvent to the reaction vessel, then add high-chlorinated polyethylene, epoxy resin, organic fluorine epoxy resin, linseed oil and acrylate and mix evenly. Heat to 80-100℃ and react for 3-5 hours. Then cool to room temperature and set aside. (2) Mix the filler, anti-settling agent and rutile titanium dioxide with the product obtained in step (1) evenly, then add plasticizer and xylene, and grind to the required fineness. The grinding temperature is 30-50℃. (3) Finally, add 325-mesh glass flakes, disperse at high speed for 20 min, filter through a 40-mesh sieve, and pack into a barrel.

2. The high-temperature resistant anti-corrosion coating according to claim 1, characterized in that: The high-temperature resistant and anti-corrosion coating is a topcoat, comprising, by weight, 15-20 parts of high-chlorinated polyethylene, 5-10 parts of epoxy resin, 0.5-1 parts of organic fluorine epoxy resin, 6-8 parts of linseed oil, 10-15 parts of acrylate, 6-8 parts of plasticizer, 10-15 parts of filler, 10-15 parts of 325-mesh glass flakes, 50-60 parts of solvent, 3-5 parts of anti-settling agent, and 6-10 parts of rutile titanium dioxide.

3. The high-temperature resistant anti-corrosion coating according to claim 1, characterized in that: The high-temperature resistant and anti-corrosion coating is a primer, which, by weight, includes 15-20 parts of high-chlorinated polyethylene, 5-10 parts of epoxy resin, 0.5-1 parts of organic fluorine epoxy resin, 6-8 parts of linseed oil, 10-15 parts of acrylate, 6-8 parts of plasticizer, 30-40 parts of filler, 0 parts of 325-mesh glass flakes, 50-60 parts of solvent, 3-5 parts of anti-settling agent, and 1-3 parts of rutile titanium dioxide.

4. A high-temperature resistant anti-corrosion coating according to any one of claims 1-3, characterized in that: The solvent is xylene and a high-boiling-point aromatic solvent in a weight ratio of 6:

4.

5. A high-temperature resistant anti-corrosion coating according to any one of claims 1-3, characterized in that: The anti-settling agent is bentonite.

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