External high-performance fireproof coating and preparation method thereof

Abstract

The invention relates to an external high-performance fireproof coating and a preparation method thereof, and belongs to the technical field of external protective paints.The external high-performance fireproof coating is prepared from, by weight, 20-25 parts of ammonium polyphosphate, 10-15 parts of pentaerythritol, 5-10 parts of melamine, 8-14 parts of two-component fluorocarbon resin, 3-5 parts of aerogel, 10-15 parts of inorganic filler and 25-35 parts of water. The two-component fluorocarbon resin is added into the fireproof coating, so that the weather resistance, solvent resistance and wear resistance of the fireproof coating are improved, and the service life of the fireproof coating is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of external protective coatings, and relates to an external high-performance fire-retardant coating and a preparation method thereof. The external high-performance fire-retardant coating can be used in the fields of steel structures, oil field pipelines, etc. Background Art

[0002] Fire retardant coating is a special coating used on the surface of combustible substrates to reduce the flammability of the coated material surface, block the rapid spread of fire, and improve the fire resistance of the coated material. Special coatings applied to the surface of combustible substrates to change the surface combustion characteristics of the material and block the rapid spread of fire; or applied to building components to improve the fire resistance of the components are called fire retardant coatings. Fire retardant coatings can improve the fire resistance of materials or prevent combustion for a certain period of time.

[0003] Fire retardant coatings are divided into intumescent fire retardant coatings and non-intumescent fire retardant coatings. Intumescent fire retardant coatings adopt a polymer matrix and add expandable fillers and other additives to achieve the expansion and fire retardant effect of the coating. It has dual functions of fire prevention and heat insulation and is widely used.

[0004] At present, epoxy resin, styrene acrylic emulsion, silicone acrylic emulsion and acrylic resin are commonly used to make film additives and adjust the viscosity of coatings. However, the durability and fireproof performance of fire-retardant coatings prepared with existing commonly used emulsions need to be improved. Summary of the invention

[0005] The present invention aims to provide an external high-performance fire-retardant coating and a preparation method thereof. The high-performance fire-retardant coating of the present invention has excellent fire-retardant performance, good durability and good weather resistance.

[0006] The technical solution adopted by the present invention to achieve its purpose is as follows:

[0007] A high-performance fireproof coating for external use comprises, by weight, 20-25 parts of ammonium polyphosphate, 10-15 parts of pentaerythritol, 5-10 parts of melamine, 8-14 parts of two-component fluorocarbon resin, 3-5 parts of aerogel, 10-15 parts of inorganic filler and 25-35 parts of water.

[0008] Preferably, the phosphorus pentoxide content in the ammonium polyphosphate is ≥68%, and the nitrogen content is ≥13%.

[0009] Preferably, the two-component fluorocarbon resin is a water-based two-component fluorocarbon resin with a fluorine content of 9-25%.

[0010] Preferably, the aerogel is a silica aerogel.

[0011] Preferably, the inorganic filler is one or any combination of calcium carbonate, talc, mica powder, silica powder, barium sulfate, kaolin, wollastonite, titanium dioxide, and expanded vermiculite.

[0012] A method for preparing an external high-performance fire-retardant coating comprises injecting water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stirring and dispersing for 30-40 minutes, adding a two-component fluorocarbon resin, stirring and dispersing for another 15-20 minutes, and obtaining an external high-performance fire-retardant coating.

[0013] The beneficial effects of the present invention are as follows: the present invention adds a two-component fluorocarbon resin into the fire-retardant coating, thereby improving the weather resistance, solvent resistance and wear resistance of the fire-retardant coating and increasing the service life of the fire-retardant coating.

[0014] The present invention adopts ammonium polyphosphate, pentaerythritol and melamine as flame retardant components to form a PCN flame retardant system, with ammonium polyphosphate as a foaming catalyst, pentaerythritol as a foaming skeleton and melamine as a foaming gas source. The three cooperate with each other, and the foaming system makes the coating foam and expand rapidly to form a honeycomb or sponge-like carbon foam layer, which isolates the flame from the object, prevents or delays combustion, plays a good fire protection role, and makes the surface smooth after ablation.

[0015] The present invention, by adding appropriate fillers and combining with the PCN flame retardant system, is conducive to forming a uniform and dense porous carbonized foam layer, enhancing the strength of the expanded carbonaceous foam layer, so that it can maintain high-efficiency flame retardant and heat insulation for a long time, thereby improving the fireproof and heat insulation performance of the fire retardant coating. In addition, the addition of fillers can increase the residual rate of the fire retardant coating, thereby improving its high-temperature ablation resistance, improving the pore structure of the carbonized layer, and thus reducing the thermal conductivity coefficient of the carbonized layer.

[0016] The addition of aerogel is to improve the pore structure of the carbonized layer of the coating, increase the foaming ratio, promote uniform and dense foaming, and improve the high-temperature stability of the porous carbonized foaming layer; at the same time, aerogel has a low thermal conductivity. The addition of aerogel can improve the thermal insulation performance, shield the thermal radiation, and block the heat transfer, thereby extending the fire resistance period and improving the fire resistance performance. DETAILED DESCRIPTION

[0017] The present invention is described in detail with reference to the following specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention. 1. Specific embodiments

[0019] Example 1

[0020] External high-performance fire retardant coating: calculated by weight, including 20 parts of ammonium polyphosphate (phosphorus pentoxide content ≥ 68%, nitrogen content ≥ 13%), 15 parts of pentaerythritol, 6 parts of melamine, 10 parts of ZH-01 water-based two-component fluorocarbon resin (fluorine content 12%), 4 parts of silica aerogel, 5 parts of calcium carbonate, 10 parts of titanium dioxide and 30 parts of water.

[0021] Preparation method: inject water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stir and disperse for 40 minutes, add two-component fluorocarbon resin, stir and disperse for another 20 minutes to obtain an external high-performance fire retardant coating.

[0022] Example 2

[0023] External high-performance fire retardant coating: calculated by weight, including 25 parts of ammonium polyphosphate (phosphorus pentoxide content ≥ 68%, nitrogen content ≥ 13%), 10 parts of pentaerythritol, 9 parts of melamine, 8 parts of ZH-01 water-based two-component fluorocarbon resin (fluorine content 12%), 3 parts of silica aerogel, 5 parts of talc, 5 parts of expanded vermiculite and 35 parts of water.

[0024] Preparation method: inject water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stir and disperse for 30 minutes, add two-component fluorocarbon resin, stir and disperse for another 15 minutes to obtain an external high-performance fire retardant coating.

[0025] Example 3

[0026] External high-performance fire retardant coating: calculated by weight, including 22 parts of ammonium polyphosphate (phosphorus pentoxide content ≥ 68%, nitrogen content ≥ 13%), 13 parts of pentaerythritol, 8 parts of melamine, 14 parts of ZH-01 water-based two-component fluorocarbon resin (fluorine content 12%), 4 parts of silica aerogel, 7 parts of mica powder, 7 parts of kaolin and 25 parts of water.

[0027] Preparation method: inject water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stir and disperse for 35 minutes, add two-component fluorocarbon resin, stir and disperse for another 20 minutes to obtain an external high-performance fire retardant coating.

[0028] Example 4

[0029] External high-performance fire retardant coating: calculated by weight, including 21 parts of ammonium polyphosphate (phosphorus pentoxide content ≥ 68%, nitrogen content ≥ 13%), 14 parts of pentaerythritol, 7 parts of melamine, 12 parts of ZH-01 water-based two-component fluorocarbon resin (fluorine content 12%), 5 parts of silica aerogel, 5 parts of wollastonite, 8 parts of kaolin and 28 parts of water.

[0030] Preparation method: inject water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stir and disperse for 40 minutes, add two-component fluorocarbon resin, stir and disperse for another 15 minutes to obtain an external high-performance fire retardant coating.

[0031] Example 5

[0032] External high-performance fire retardant coating: calculated by weight, including 24 parts of ammonium polyphosphate (phosphorus pentoxide content ≥ 68%, nitrogen content ≥ 13%), 11 parts of pentaerythritol, 5 parts of melamine, 13 parts of ZH-01 water-based two-component fluorocarbon resin (fluorine content 12%), 3 parts of silica aerogel, 6 parts of silica powder, 6 parts of barium sulfate and 32 parts of water.

[0033] Preparation method: inject water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stir and disperse for 30 minutes, add two-component fluorocarbon resin, stir and disperse for another 20 minutes to obtain an external high-performance fire retardant coating.

[0034] Comparative Example 1

[0035] External high-performance fire retardant coating: calculated by weight, including 25 parts of ammonium polyphosphate (phosphorus pentoxide content ≥ 68%, nitrogen content ≥ 13%), 10 parts of pentaerythritol, 9 parts of melamine, 8 parts of styrene acrylic emulsion, 3 parts of silica aerogel, 5 parts of talc, 5 parts of expanded vermiculite and 35 parts of water.

[0036] Preparation method: inject water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stir and disperse for 30 minutes, add styrene acrylic emulsion, stir and disperse for another 15 minutes to obtain an external high-performance fire retardant coating.

[0037] Comparative Example 2

[0038] External high-performance fire retardant coating: calculated by weight, including 25 parts of ammonium polyphosphate (phosphorus pentoxide content ≥ 68%, nitrogen content ≥ 13%), 10 parts of pentaerythritol, 9 parts of melamine, 8 parts of acrylic emulsion, 3 parts of silica aerogel, 5 parts of talc, 5 parts of expanded vermiculite and 35 parts of water.

[0039] Preparation method: inject water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stir and disperse for 30 minutes, add acrylic emulsion, stir and disperse for another 15 minutes to obtain an external high-performance fire retardant coating.

[0040] Comparative Example 3

[0041] External high-performance fire retardant coating: calculated by weight, including 25 parts of ammonium polyphosphate (phosphorus pentoxide content ≥ 68%, nitrogen content ≥ 13%), 10 parts of pentaerythritol, 9 parts of melamine, 8 parts of ZH-01 water-based two-component fluorocarbon resin (fluorine content 12%), 5 parts of talc, 5 parts of expanded vermiculite and 35 parts of water.

[0042] Preparation method: inject water, ammonium polyphosphate, pentaerythritol, melamine and inorganic filler into a disperser, stir and disperse for 30 minutes, add two-component fluorocarbon resin, stir and disperse for another 15 minutes to obtain an external high-performance fire retardant coating.

[0043] 2. Performance Testing

[0044] 1. According to the national standard GB14907-2018, the physical and chemical properties of fire retardant coatings (coating thickness 5mm) are tested in Table 1

[0045]

[0046] Table 2

[0047]

[0048]

[0049] 2. Adhesion and foaming ratio test (coating thickness 5mm) Table 3

[0050]

[0051]

Claims

1. A high-performance fire-retardant coating for external use, characterized in that: Calculated by weight, the composition comprises 20-25 parts of ammonium polyphosphate, 10-15 parts of pentaerythritol, 5-10 parts of melamine, 8-14 parts of two-component fluorocarbon resin, 3-5 parts of aerogel, 10-15 parts of inorganic filler and 25-35 parts of water.

2. The external high-performance fire retardant coating according to claim 1, characterized in that: The phosphorus pentoxide content in ammonium polyphosphate is ≥68% and the nitrogen content is ≥13%.

3. The external high-performance fire retardant coating according to claim 1, characterized in that: The two-component fluorocarbon resin is a water-based two-component fluorocarbon resin with a fluorine content of 9-25%.

4. The external high-performance fire retardant coating according to claim 1, characterized in that: The aerogel is a silica aerogel.

5. The external high-performance fire retardant coating according to claim 1, characterized in that: The inorganic filler is one or any combination of calcium carbonate, talc, mica powder, silica powder, barium sulfate, kaolin, wollastonite, titanium dioxide, and expanded vermiculite.

6. A method for preparing an external high-performance fire-retardant coating, characterized in that: Inject water, ammonium polyphosphate, pentaerythritol, melamine, aerogel and inorganic filler into a disperser, stir and disperse for 30-40 minutes, add two-component fluorocarbon resin, stir and disperse for another 15-20 minutes, and obtain an external high-performance fire retardant coating.

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