High-temperature-resistant primer for aviation and preparation method of high-temperature-resistant primer

Abstract

The invention provides a high-temperature-resistant primer for aviation. The high-temperature-resistant primer is prepared from the following raw materials in parts by mass: 100 parts of modified organic silicon resin, 9-12 parts of an anti-rust pigment, 29-35 parts of pigment filler, 3-5 parts of a flame retardant, 0.5-1 part of a dispersing agent, 2-4 parts of an anti-settling agent, 0.1-0.3 part of a defoaming agent, 15-18 parts of a mixed solvent and 0-7 parts of a curing agent, the high-temperature-resistant primer for aviation is air-drying paint and can be cured at normal temperature, a curing agent can also be selectively added into an epoxy modified organic silicon resin system, and the high-temperature-resistant primer can resist the high temperature of 300 DEG C for a long time, has excellent adhesive force and excellent temperature impact resistance, salt mist resistance and oil product resistance, and can be used as a high-temperature-resistant primer for aviation. After the coating is applied to the aircraft skin, excellent adhesion with a base material can be ensured, cracking caused by stress change is avoided, and the coating has good compatibility with functional coatings such as a conductive coating, a wave-absorbing coating and an infrared coating.

Description

Technical Field

[0001] The present invention relates to the technical field of functional materials, in particular to a high-temperature resistant primer for aviation and a preparation method thereof. Background Art

[0002] With the rapid development of science and technology and changes in the war situation, future fighter performance requirements will focus more on all-weather combat capability, supersonic cruise, stealth performance, networked combat capability and other aspects.

[0003] High-speed fighter aircraft place stringent temperature-resistant demands on composite coatings applied to their exteriors. The primer is a crucial layer in the composite coating, serving as a bridge between the upper and lower layers. It must ensure excellent adhesion to the exterior without cracking due to stress fluctuations, while also maintaining good compatibility with functional coatings such as conductive paint, radar-absorbing paint, and infrared (IR) coatings. To achieve stealth, fighter aircraft surface coatings typically consist of a composite of primer, conductive paint, radar-absorbing paint, and IR coating. When a fighter aircraft flies at high speeds, air friction generates significant heat, causing surface temperatures to rise. For example, an F-15 fighter jet flying at Mach 2.5 can reach surface temperatures of 140 to 170 degrees Celsius. Even the high-altitude, high-speed reconnaissance aircraft, such as the SR-71 Blackbird, can reach temperatures exceeding 300 degrees Celsius at Mach 3 at an altitude of 32,000 meters.

[0004] For example, CN202310294496.7 discloses an aircraft skin paint layer based on a modified resin. The primer involved in this invention is formulated from a modified epoxy resin. Although it has excellent adhesion and temperature shock resistance, its high temperature resistance is poor; for example, CN201610894865.6 discloses a high temperature resistant primer. The primer involved in this invention is formulated from a polyester resin and an amino resin. The coating has good comprehensive performance after baking, which can effectively solve the problem of brittle paint film and lack of adhesion after high temperature baking of traditional epoxy amino primers. Although it has certain high temperature resistance, it is still difficult to meet the temperature resistance requirement of 300°C; for example, CN201410134176.6 discloses a fluorocarbon yellow primer and a preparation method thereof. The primer involved in this invention does not meet environmental protection requirements due to the addition of strontium chrome yellow pigment. For this reason, the present invention proposes a high temperature resistant primer for aviation and a preparation method thereof that can solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a high-temperature resistant primer for aviation and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A high-temperature resistant primer for aviation is made from the following raw materials in the following proportions by weight:

[0008] 100 parts of modified silicone resin;

[0009] 9-12 parts of anti-rust pigment;

[0010] 29-35 parts of pigments and fillers;

[0011] 3-5 parts of flame retardant;

[0012] Dispersant 0.5-1 part;

[0013] 2-4 parts of anti-settling agent;

[0014] 0.1-0.3 parts of defoaming agent;

[0015] 15-18 parts of mixed solvent;

[0016] 0-7 parts of curing agent.

[0017] Preferably, the modified silicone resin is an epoxy-modified silicone resin or an acrylic-modified silicone resin, and has a solid content of 40% to 60%.

[0018] Preferably, the anti-rust pigment is one of composite zinc phosphate and 8-hydroxyquinoline zinc, or a mixture of the two in any ratio.

[0019] Preferably, the color filler includes a coloring pigment and a physical filler, the coloring pigment includes one or a mixture of several of titanium nickel yellow, cobalt green, rutile titanium dioxide and carbon black in any proportion, and the physical filler includes one or a mixture of two of talc and kaolin in any proportion.

[0020] Preferably, the flame retardant is antimony trioxide.

[0021] Preferably, the dispersant is a mixture of polymer carboxylic acid and modified polysiloxane.

[0022] Preferably, the anti-settling agent is one or a mixture of polyethylene wax, polyamide wax and fumed silica in any ratio.

[0023] Preferably, the defoaming agent is a silicone defoaming agent.

[0024] Preferably, the mixed solvent is xylene and n-butanol, and xylene and n-butanol are mixed in a mass ratio of 2:1 to 4:1.

[0025] Preferably, the curing agent is a modified aromatic amine.

[0026] A preparation method is also provided for producing any of the above-mentioned high-temperature resistant primers for aviation, which specifically comprises the following steps:

[0027] S1, pre-dispersion, add modified silicone resin, mixed solvent, dispersant, anti-settling agent into the dispersion tank, disperse at a speed of 1000-1500r / min for 5-8min, then add anti-rust pigment, color filler, defoamer, and disperse at a speed of 800-1000r / min for 10-15min;

[0028] S2, grinding, adding the pre-dispersed mixture into a sand mill and grinding until the fineness is no more than 10 μm;

[0029] S3. Package the curing agent separately and select it according to needs.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This high-temperature resistant primer can withstand high temperatures of 300°C for a long time, has excellent adhesion and outstanding resistance to temperature shock, salt spray, and oil. When used on aircraft skins, it can not only ensure excellent adhesion to the substrate without cracking due to stress changes, but also has good compatibility with functional coatings such as conductive coatings, radar-absorbing coatings, and infrared coatings. It also has the advantages of light weight, low cost, and simple production process. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1

[0034] The high temperature resistant primer for aviation use is made of the following raw materials in the following proportions by weight:

[0035] 100 parts of modified silicone resin, 9 parts of anti-rust pigment, 35 parts of color filler, 5 parts of flame retardant, 1 part of dispersant; 4 parts of anti-settling agent, 0.3 parts of defoaming agent, 18 parts of mixed solvent;

[0036] Among them, the modified silicone resin is acrylic modified silicone resin with a solid content of 60%; the anti-rust pigment is composite zinc phosphate; 35 parts of color filler are 25 parts by mass of rutile titanium dioxide and 10 parts by mass of talc; the flame retardant is antimony trioxide; the dispersant is Deqian 904S dispersant; the anti-settling agent is polyamide wax, the defoaming agent is Deqian 6800 defoaming agent, and the mixed solvents are xylene and n-butanol, which are mixed in a ratio of 4:1 by mass.

[0037] The preparation method of high temperature resistant primer for aviation specifically comprises the following steps:

[0038] Add 100 parts by mass of acrylic modified silicone resin, 18 parts by mass of xylene and n-butanol, 1 part by mass of Deqian 904S dispersant, and 4 parts by mass of polyamide wax into a dispersion tank and disperse at a speed of 1000 r / min for 8 minutes;

[0039] Then, 9 parts by mass of composite zinc phosphate, 25 parts by mass of rutile titanium dioxide, 10 parts by mass of talc, 5 parts by mass of antimony trioxide, and 0.3 parts by mass of Deqian 6800 defoamer were added and dispersed at a speed of 1000 r / min for 10 minutes.

[0040] The pre-dispersed mixture is added into a horizontal sand mill and ground until the fineness reaches 10 μm, and the white high-temperature resistant primer is obtained.

[0041] Example 2:

[0042] The high temperature resistant primer for aviation use is made of the following raw materials in the following proportions by weight:

[0043] 100 parts of modified silicone resin, 12 parts of anti-rust pigment, 29 parts of color and filler, 3 parts of flame retardant, 0.5 parts of dispersant; 2 parts of anti-settling agent, 0.1 parts of defoaming agent, 15 parts of mixed solvent;

[0044] Among them, the modified silicone resin is epoxy modified silicone resin with a solid content of 40%; the anti-rust pigment is composite zinc phosphate; 29 parts of color filler are 15 parts by mass of rutile titanium dioxide, 2 parts by mass of carbon black, and 12 parts by mass of kaolin; the flame retardant is antimony trioxide; the dispersant is Deqian 904S dispersant; the anti-settling agent is polyamide wax, the defoaming agent is Deqian 6800 defoaming agent, and the mixed solvents are xylene and n-butanol, which are mixed in a ratio of 2:1 by mass.

[0045] The preparation method of high temperature resistant primer for aviation specifically comprises the following steps:

[0046] Add 100 parts by mass of epoxy modified silicone resin, 15 parts by mass of xylene and n-butanol, 0.5 parts by mass of Deqian 904S dispersant, and 2 parts by mass of polyamide wax into a dispersion tank, and disperse at a speed of 1500 r / min for 5 minutes.

[0047] Then, 12 parts by mass of composite zinc phosphate, 15 parts by mass of rutile titanium dioxide, 2 parts by mass of carbon black, 12 parts by mass of kaolin, 3 parts by mass of antimony trioxide, and 0.1 parts by mass of Deqian 6800 defoaming agent were added and dispersed at a speed of 800 r / min for 15 minutes.

[0048] The pre-dispersed mixture is added into a horizontal sand mill and ground. When the fineness reaches 5 μm, the gray high-temperature resistant primer is obtained.

[0049] Example 3:

[0050] The high temperature resistant primer for aviation use is made of the following raw materials in the following proportions by weight:

[0051] 100 parts of modified silicone resin, 10 parts of anti-rust pigment, 32 parts of color filler, 4 parts of flame retardant, 0.8 parts of dispersant; 3 parts of anti-settling agent, 0.2 parts of defoaming agent, 16 parts of mixed solvent;

[0052] Among them, the modified silicone resin is epoxy modified silicone resin with a solid content of 50%; the anti-rust pigment is composite zinc phosphate; 32 parts of color filler are 12 parts by mass of rutile titanium dioxide, 8 parts by mass of titanium nickel yellow, 5 parts by mass of kaolin, and 7 parts by mass of talc; the flame retardant is antimony trioxide; the dispersant is Deqian 904S dispersant; the anti-settling agent is polyamide wax, the defoaming agent is Deqian 6800 defoaming agent, and the mixed solvents are xylene and n-butanol, and xylene and n-butanol are mixed in a ratio of 7:3 by mass.

[0053] The preparation method of high temperature resistant primer for aviation specifically comprises the following steps:

[0054] Add 100 parts by mass of epoxy-modified silicone resin, 16 parts by mass of xylene and n-butanol, 0.8 parts by mass of Deqian 904S dispersant, and 3 parts by mass of polyamide wax into a dispersion tank and disperse at a speed of 1200 r / min for 7 minutes;

[0055] Then add 10 parts by mass of composite zinc phosphate, 12 parts by mass of rutile titanium dioxide, 8 parts by mass of titanium nickel yellow, 5 parts by mass of kaolin, 7 parts by mass of talc, 4 parts by mass of antimony trioxide, and 0.2 parts by mass of Deqian 6800 defoamer, and disperse at a speed of 900 r / min for 13 minutes.

[0056] The pre-dispersed mixture is added to a horizontal sand mill and ground. The material is discharged when the fineness reaches 10 μm. The paint is light yellow and is marked as component A. 7 parts by mass of modified aromatic amine curing agent (BD-12) is packaged separately and marked as component B. The high-temperature resistant primer is composed of components A and B.

[0057] Example 4:

[0058] Polyethylene wax was used instead of polyamide wax, and other aspects were the same as in Examples 1-3.

[0059] Example 5:

[0060] The polyamide wax was replaced by fumed silica, and the rest was the same as in Example 1-3.

[0061] Example 6:

[0062] A mixture of polyethylene wax, polyamide wax and fumed silica in any proportion is used instead of the polyamide wax, and the rest is the same as in Examples 1-3.

[0063] Example 7:

[0064] 8-Hydroxyquinoline zinc was used instead of composite zinc phosphate, and the rest was the same as in Example 1-6.

[0065] Example 8:

[0066] A mixture of composite zinc phosphate and 8-hydroxyquinoline zinc in any ratio is used instead of composite zinc phosphate, and the rest is the same as in Examples 1-6.

[0067] Example 9:

[0068] Cobalt green was used instead of titanium nickel yellow, and the rest was the same as in Example 3.

[0069] Example 10:

[0070] The rutile titanium dioxide in Example 1 is replaced by a mixture of titanium nickel yellow, cobalt green, rutile titanium dioxide and carbon black in any proportion, and the rest are the same as in Examples 1-8.

[0071] Specifically, a modified silicone resin is selected as the basic resin of the high temperature resistant primer. The modified silicone resin has excellent high temperature resistance. At the same time, in order to increase the adhesion of the primer to the skin and the compatibility with other functional coatings, epoxy modified silicone resin or acrylic modified silicone resin is further selected. Both resins are self-drying resins and can be cured at room temperature (more than 24 hours) or heated (80℃~150℃) to shorten the curing time (1h~2h). The epoxy modified silicone resin can be optionally added with modified aromatic Amine curing agents are used to further increase the crosslinking density. Composite zinc phosphate and 8-hydroxyquinoline zinc are selected as anti-rust pigments. Composite zinc phosphate can form a dense Zn-Al-Fe-MP passivation film with the aluminum alloy substrate, resulting in electrochemical inhibition. 8-hydroxyquinoline zinc has a strong adsorption effect and can be tightly adsorbed on the surface of the aluminum alloy substrate, thereby achieving physical isolation of the corrosive medium. The synergistic effect of the two can achieve better anti-corrosion effects. Titanium nickel yellow, cobalt green, rutile titanium dioxide and carbon black are selected as coloring pigments to make the primer resistant to high temperatures and meet environmental requirements.

[0072] The high-temperature resistant primer prepared by the present invention is a self-drying paint that can be cured at room temperature. The high-temperature resistant primer can withstand high temperatures of 300°C for a long time, has excellent adhesion and outstanding resistance to temperature shock, salt spray, and oil products. After being used for aircraft skins, it can ensure excellent adhesion to the substrate without cracking due to stress changes, and can also have good compatibility with functional coatings such as conductive coatings, radar-absorbing coatings, and infrared coatings. At the same time, it also has the advantages of light weight, low cost, and simple production process.

[0073] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant primer for aviation, characterized in that: Made from the following raw materials in the following proportions by mass: 100 parts of modified silicone resin; 9-12 parts of anti-rust pigment; 29-35 parts of pigments and fillers; 3-5 parts of flame retardant; Dispersant 0.5-1 part; 2-4 parts of anti-settling agent; 0.1-0.3 parts of defoaming agent; 15-18 parts of mixed solvent; 0-7 parts of curing agent.

2. The high temperature resistant primer for aviation according to claim 1, characterized in that: The modified silicone resin is epoxy-modified silicone resin or acrylic acid-modified silicone resin, and has a solid content of 40% to 60%.

3. The high temperature resistant primer for aviation according to claim 1, characterized in that: The anti-rust pigment is one of composite zinc phosphate and 8-hydroxyquinoline zinc, or a mixture of the two in any ratio.

4. The high temperature resistant primer for aviation according to claim 1, characterized in that: The color filler includes a coloring pigment and a physical filler. The coloring pigment includes one or a mixture of several of titanium nickel yellow, cobalt green, rutile titanium dioxide and carbon black in any proportion. The physical filler includes one or a mixture of two of talc and kaolin in any proportion.

5. The high temperature resistant primer for aviation according to claim 1, characterized in that: The flame retardant is antimony trioxide, and the dispersant is a mixture of high molecular carboxylic acid and modified polysiloxane.

6. The high temperature resistant primer for aviation according to claim 1, characterized in that: The anti-settling agent is one or a mixture of polyethylene wax, polyamide wax and fumed silica in any proportion.

7. The high temperature resistant primer for aviation according to claim 1, characterized in that: The defoaming agent is an organosilicon defoaming agent.

8. The high temperature resistant primer for aviation according to claim 1, characterized in that: The mixed solvent is prepared by mixing xylene and n-butanol in a mass ratio of 2:1 to 4:

1.

9. The high temperature resistant primer for aviation according to claim 1, characterized in that: The curing agent is modified aromatic amine.

10. A method for preparing the high-temperature resistant primer for aviation according to any one of claims 1 to 9, comprising the following steps: S1, pre-dispersion, add modified silicone resin, mixed solvent, dispersant, anti-settling agent into the dispersion tank, disperse at a speed of 1000-1500r / min for 5-8min, then add anti-rust pigment, color filler, defoamer, and disperse at a speed of 800-1000r / min for 10-15min; S2, grinding, adding the pre-dispersed mixture into a sand mill and grinding until the fineness is no more than 10 μm; S3. Package the curing agent separately and select it according to needs.