INTUMESCENT FIRE-RETARDANT COATING WITH ULTRA-HIGH CORROSION RESISTANCE AND PREPARATION METHOD THEREOF

Abstract

Disclosed are an intumescent fire-retardant coating with ultra-high corrosion resistance and a preparation method thereof. The fire-retardant coating is composed by water, wetting and dispersing agent, defoaming agent, composite carbon-forming catalyst, composite blowing agent, pentaerythritol, titanium dioxide, Mg(OH).sub.2, mica powder, kaolin, anti-rust pigment, aluminum tripolyphosphate, VAE emulsion, freeze-thaw agent, film-forming aid, and thickener. On the basis of the existing fire-retardant coatings, the present disclosure adds a series of anti-corrosion, heat insulation fillers and salt spray resistance additives to achieve a certain salt spray resistance effect. The fire-retardant coating of the present disclosure has both fire-retardant and anticorrosive functions, does not contain organic solvents, is low in price, has high construction tolerance, and has broad application prospects in the field of intumescent fire-retardant coatings.

Claims

1. An intumescent fire-retardant coating with ultra-high corrosion resistance, wherein comprising the following components and mass ratios: water 13-20; wetting and dispersing agent 0.3-0.6; defoaming agent 0.2-0.5; composite carbon-forming catalyst 12-20; composite blowing agent 6-10; pentaerythritol 6-10; titanium dioxide 3-6; Mg(OH).sub.2 4-8; mica powder 3-6; kaolin 3-7; anti-rust pigment 3-7; aluminum tripolyphosphate 4-7; vinyl acetate-ethylene (VAE) emulsion 11-21; freeze-thaw agent 0.6-0.8; film-forming aid 1.0-1.8; thickener 0.2-0.5; the composite carbon-forming catalyst is a mixture of ammonium polyphosphate and calcium phytate, and the mass ratio of the ammonium polyphosphate and calcium phytate is 2:1; and the composite blowing agent is a mixture of melamine and chlorinated paraffin, and the mass ratio of melamine and chlorinated paraffin is 2:1.

2. The intumescent fire-retardant coating with ultra-high corrosion resistance according to claim 1, wherein, the wetting and dispersing agent is an ammonium polycarboxylate salt dispersing agent; the defoaming agent is a silicone defoaming agent; the freeze-thaw agent is ethylene glycol; the film-forming aid is alcohol ester 12; and the thickener is an associative polyurethane thickener.

3. The intumescent fire-retardant coating with ultra-high corrosion resistance according to claim 1, wherein, the titanium dioxide is rutile titanium dioxide.

4. The intumescent fire-retardant coating with ultra-high corrosion resistance according to claim 1, wherein, the Mg(OH).sub.2 is magnesium hydroxide; the mica powder is sericite; and the kaolin is calcined kaolin.

5. The intumescent fire-retardant coating with ultra-high corrosion resistance according to claim 1, wherein, the anti-rust pigment is strontium zinc phosphosilicate.

6. The intumescent fire-retardant coating with ultra-high corrosion resistance according to claim 1, wherein, the aluminum tripolyphosphate has a sheet-like structure, and its structural formula is as follows: ##STR00002##

7. The intumescent fire-retardant coating with ultra-high corrosion resistance according to claim 1, wherein, the VAE emulsion is a vinyl acetate-ethylene copolymer emulsion.

8. A method for preparing the intumescent fire-retardant coating with ultra-high corrosion resistance according to claim 1, wherein, comprising the following steps: (1) adding 13-20% of the water, 0.3-0.6% of the wetting and dispersing agent, and 0.2-0.5% of the defoaming agent to a disperser and stirring at a rotation speed of 300-400 revolutions/minute for 3-5 minutes; (2) adding 12-20% of the composite carbon-forming catalyst, 6-10% of the composite blowing agent, 6-10% of the pentaerythritol, 3-6% of titanium dioxide, 4-8% of Mg(OH).sub.2, 3-6% of the mica powder, 3-7% of the kaolin, 3-7% of the anti-rust pigment, 4-7% of the aluminum tripolyphosphate in sequence at a rotation speed of 400-900 revolutions/minute, adjusting the rotation speed to 1800-2000 revolutions/minute, and dispersing for 45-60 minutes; (3) adding 11-21% of the VAE emulsion, 0.6-0.8% of the freeze-thaw agent, 1.0-1.8% of the film-forming aid and 0.2-0.5% of the thickener at a rotation speed of 700-900 revolutions/minute.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

Example 1

[0046] An intumescent fire-retardant coating with ultra-high corrosion resistance, which was prepared from the following raw materials according to the following mass ratios through the following steps:

[0047] (1) 18.7% of water, 0.5% of wetting and dispersing agent, and 0.3% of defoaming agent were added to a disperser and stirred at a speed of 300-400 r/min for 3-5 min;

[0048] (2) 12% of composite carbon-forming catalyst, 6% of composite blowing agent, 6% of pentaerythritol, 5% of titanium dioxide, 8% of Mg(OH).sub.2, 5% of mica powder, 6% of kaolin, 3% of anti-rust pigment, 6% of aluminum tripolyphosphate were added in sequence at a speed of 400-900 r/min, then the speed was adjusted to 1800-2000 r/min, and the components were dispersed for 45-60 min:

[0049] (3) 20% of VAE emulsion, 0.7% of freeze-thaw agent, 1.5% of film-forming aid and 0.3% of thickener were added at a speed of 700-900 r/min.

Example 2

[0050] An intumescent fire-retardant coating with ultra-high corrosion resistance, which was prepared from the following raw materials according to the following mass ratios through the following steps:

[0051] (1) 18.7% of water, 0.5% of wetting and dispersing agent, and 0.3% of defoaming agent were added to a disperser and stirred at a speed of 300-400 r/min for 3-5 min;

[0052] (2) 16% of composite carbon-forming catalyst, 7% of composite blowing agent, 7% of pentaerythritol, 5% of titanium dioxide, 7% of Mg(OH).sub.2, 4% of mica powder, 4% of kaolin, 3% of anti-rust pigment, 5% of aluminum tripolyphosphate were added in sequence at a speed of 400-900 r/min, then the speed was adjusted to 1800-2000 r/min, and the components were dispersed for 45-60 min;

[0053] (3) 20% of VAE emulsion, 0.7% of freeze-thaw agent, 1.5% of film-forming aid and 0.3% of thickener were added at a speed of 700-900 r/min.

Example 3

[0054] An intumescent fire-retardant coating with ultra-high corrosion resistance, which was prepared from the following raw materials according to the following mass ratios through the following steps:

[0055] (1) 18% of water, 0.5% of wetting and dispersing agent, and 0.3% of defoaming agent were added to a disperser and stirred at a speed of 300-400 r/min for 3-5 min;

[0056] (2) 18% of composite carbon-forming catalyst, 9% of composite blowing agent, 8% of pentaerythritol, 5% of titanium dioxide, 5% of Mg(OH).sub.2, 4% of mica powder, 3% of kaolin, 3% of anti-rust pigment, 5% of aluminum tripolyphosphate were added in sequence at a speed of 400-900 r/min, then the speed was adjusted to 1800-2000 r/min, and the components were dispersed for 45-60 min;

[0057] (3) 19% of VAE emulsion, 0.7% of freeze-thaw agent, 1.2% of film-forming aid and 0.3% of thickener were added at a speed of 700-900 r/min.

Example 4

[0058] An intumescent fire-retardant coating with ultra-high corrosion resistance, which was prepared from the following raw materials according to the following mass ratios through the following steps:

[0059] (1) 17% of water, 0.5% of wetting and dispersing agent, and 0.3% of defoaming agent were added to a disperser and stirred at a speed of 300-400 r/min for 3-5 min;

[0060] (2) 18% of composite carbon-forming catalyst, 9% of composite blowing agent, 8% of pentaerythritol, 5% of titanium dioxide, 5% of Mg(OH).sub.2, 4% of mica powder, 3% of kaolin, 4% of anti-rust pigment, 5% of aluminum tripolyphosphate were added in sequence at a speed of 400-900 r/min, then the speed was adjusted to 1800-2000 r/min, and the components were dispersed for 45-60 min;

[0061] (3) 19% of VAE emulsion, 0.7% of freeze-thaw agent, 1.2% of film-forming aid and 0.3% of thickener were added at a speed of 700-900 r/min.

Example 5

[0062] An intumescent fire-retardant coating with ultra-high corrosion resistance, which was prepared from the following raw materials according to the following mass ratios through the following steps:

[0063] (1) 16% of water, 0.5% of wetting and dispersing agent, and 0.3% of defoaming agent were added to a disperser and stirred at a speed of 300-400 r/min for 3-5 min:

[0064] (2) 18% of composite carbon-forming catalyst, 9% of composite blowing agent, 8% of pentaerythritol, 5% of titanium dioxide, 5% of Mg(OH).sub.2, 4% of mica powder, 3% of kaolin, 5% of anti-rust pigment, 5% of aluminum tripolyphosphate were added in sequence at a speed of 400-900 r/min, then the speed was adjusted to 1800-2000 r/min, and the components were dispersed for 45-60 min;

[0065] (3) 19% of VAE emulsion, 0.7% of freeze-thaw agent, 1.2% of film-forming aid and 0.3% of thickener were added at a speed of 700-900 r/min.

Example 6

[0066] An intumescent fire-retardant coating with ultra-high corrosion resistance, which was prepared from the following raw materials according to the following mass ratios through the following steps:

[0067] (1) 15% of water, 0.5% of wetting and dispersing agent, and 0.3% of defoaming agent were added to a disperser and stirred at a speed of 300-400 r/min for 3-5 min;

[0068] (2) 18% of composite carbon-forming catalyst, 9% of composite blowing agent, 8% of pentaerythritol, 5% of titanium dioxide, 5% of Mg(OH).sub.2, 4% of mica powder, 3% of kaolin, 6% of anti-rust pigment, 5% of aluminum tripolyphosphate were added in sequence at a speed of 400-900 r/min, then the speed was adjusted to 1800-2000 r/min, and the components were dispersed for 45-60 min:

[0069] (3) 19% of VAE emulsion, 0.7% of freeze-thaw agent, 1.2% of film-forming aid and 0.3% of thickener were added at a speed of 700-900 r/min.

Example 7

[0070] An intumescent fire-retardant coating with ultra-high corrosion resistance, which was prepared from the following raw materials according to the following mass ratios through the following steps:

[0071] (1) 15% of water, 0.5% of wetting and dispersing agent, and 0.3% of defoaming agent were added to a disperser and stirred at a speed of 300-400 r/min for 3-5 min;

[0072] (2) 18% of composite carbon-forming catalyst, 9% of composite blowing agent, 8% of pentaerythritol, 5% of titanium dioxide, 5% of Mg(OH).sub.2, 4% of mica powder, 3% of kaolin, 5% of anti-rust pigment, 6% of aluminum tripolyphosphate were added in sequence at a speed of 400-900 r/min, then the speed was adjusted to 1800-2000 r/min, and the components were dispersed for 45-60 min;

[0073] (3) 19% of VAE emulsion, 0.7% of freeze-thaw agent, 1.2% of film-forming aid and 0.3% of thickener were added at a speed of 700-900 r/min.

[0074] In the above embodiments: the water is ordinary tap water; the wetting and dispersing agent is Clariant XW330 ammonium salt dispersant; the defoaming agent is BYK-019 silicone defoaming agent; the fire retardant is the self-made composite fire retardant; the titanium dioxide is R818 from Jinan Yuxing; the magnesium hydroxide, mica powder, and kaolin are all industrial-grade powder from Shenzhen Jinhaohui; the anti-rust pigment is SZP-391 imported zinc phosphate from Halox; the aluminum tripolyphosphate is industrial grade aluminum tripolyphosphate from Shijiazhuang Xinsheng Chemical Co.; the VAE emulsion is WACKER 706K vinyl acetate-ethylene copolymer emulsion; the freeze-thaw agent is ethylene glycol from Qilu; the film-forming aid is C-12 from Qilu; and the polyurethane thickener is TEGO3010 from Tego.

[0075] According to “Fire-retardant coating for steel structure” GB14907-2018, the intumescent fire-retardant coatings prepared in the above 7 embodiments were tested, and the test results are shown in Table 1. According to “Anticorrosive Coatings for Building Steel Structure” JG/T224-2007, the intumescent fire-retardant coatings prepared in the above 7 embodiments were tested for salt spray resistance, and the test results are shown in Table 2. It can be seen from the test data that the intumescent fire-retardant coating prepared by the present disclosure has excellent fire-retardant performance and ultra-high salt spray resistance.

[0076] The above specific embodiments are only detailed explanations of the technical schemes of the present disclosure. The present disclosure is not limited to the above embodiments. All equivalent changes and modifications made according to the scope of the present disclosure and the contents of the specification shall fall within the protection scope of the present disclosure.

TABLE-US-00001 TABLE 1 Test results based on “Fire-retardant coatings for steel structures” GB14907-2018 performance test Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 status in the normal normal normal normal normal normal normal container initial dry cracking no no no no no no no resistance cracking cracking cracking cracking cracking cracking cracking bond strength/MPa 0.81 0.81 0.79 0.79 0.78 0.79 0.79 coating thickness/ 3 3 3 3 3 3 3 mm duration of fire 124 139 167 168 173 169 181 resistance/min inflation rate 37 52 69 71 65 59 68

TABLE-US-00002 TABLE 2 Test results of salt spray resistance based on “Anticorrosive Coatings for Building Steel Structure” JG/T224-2007 performance test Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 salt spray no peeling no peeling no peeling no peeling no peeling no peeling no peeling resistance and red rust and red rust and red rust and red rust and red rust and red rust and red rust appear after appear after appear after appear after appear after appear after appear after 600 h 500 h 500 h 600 h 700 h 900 h 1000 h