Graphite fireproof coating and preparation method thereof

Abstract

The invention provides a preparation method of a graphite fireproof coating, which comprises the following steps: mixing and grinding iron oxide and expanded graphite, expanding at 800-1300 DEG C, and grinding into powder to obtain an expanded graphite polymer; the fireproof coating is prepared by uniformly stirring and mixing the following components in percentage by weight: 13 to 18 percent of expanded graphite polymer, 35 to 40 percent of styrene-acrylic emulsion, 0.2 to 0.3 percent of carboxymethyl cellulose, 1 to 1.8 percent of sodium polyacrylate, 12 to 15 percent of heavy calcium powder, 0.2 to 0.4 percent of silicone oil and the balance of water. Meanwhile, the graphite fireproof coating prepared by the preparation method can improve the usage amount of the expanded graphite, and solves the problem that the expanded graphite needs to be matched with other flame retardants in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of fireproof coatings, and particularly to a preparation method of a graphite fireproof coating. Background Art

[0002] Fireproof coatings have a wide range of applications. Expanded graphite can be used as one of the flame retardant components of fireproof coatings. For example, an invention application with Chinese publication number CN119529640A provides an epoxy fireproof coating and its preparation method. The fireproof coating includes component A and component B. By weight, component A includes 20-30 parts of silane-modified phenolic epoxy resin, 5-9 parts of epoxy active diluent, 5-10 parts of aluminum hydroxide, 5-8 parts of melamine, 25-48 parts of ammonium polyphosphate, 0.5-1 part of expanded graphite, 6-8 parts of alumina fiber, 3-10 parts of barium sulfate, 3-5 parts of modified alumina, and 2-5 parts of titanium dioxide; component B includes 40-50 parts of phenolic amine and 50-60 parts of 1,3-cyclohexanedimethanamine. The coating provided by this invention combines at least the fireproof performance in case of fire, the anti-corrosion performance in the marine environment, and the room-temperature curing performance, and is applied to fireproof and anti-corrosion coatings for steel structures such as offshore oil and gas platforms and petrochemical plant devices. The usage amount of expanded graphite in this invention application is extremely low, and it needs to be combined with other flame retardants to achieve the fire prevention effect, which limits the application and popularization of expanded graphite. Summary of the Invention

[0003] Aiming at the deficiencies in the prior art, the present invention provides a preparation method of a graphite fireproof coating, which solves the problem that expanded graphite needs to be used in combination with other flame retardants in the prior art.

[0004] According to an embodiment of the present invention, a preparation method of a graphite fireproof coating includes the following steps: mixing iron oxide and expanded graphite and grinding them, then performing an expansion treatment at 800-1300 °C, and then grinding into powder to obtain an expanded graphite polymer. Mix 13-18% of the expanded graphite polymer, 35-40% of styrene-acrylic emulsion, 0.2-0.3% of carboxymethyl cellulose, 1-1.8% of sodium polyacrylate, 12-15% of heavy calcium powder, 0.2-0.4% of silicone oil, and the balance is water, and stir and mix evenly to obtain the fireproof coating.

[0005] Further, the expansion treatment time is 0.5-1 h.

[0006] Further, the iron oxide includes iron(III) oxide.

[0007] Further, the iron oxide includes iron(II,III) oxide.

[0008] Further, the iron oxide includes iron(III) oxide and iron(II,III) oxide in a weight ratio of 1:1.

[0009] Further, the fineness of the expanded graphite polymer is 10 microns.

[0010] Further, the fineness of the heavy calcium powder is 10 microns.

[0011] Further, the stirring and mixing conditions are a time of 1 h and a speed of 1000 revolutions per minute.

[0012] Further, the weight ratio of iron oxide to expanded graphite is 1:2.

[0013] Also provided is a graphite fireproof coating prepared by the above method.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By using co-extrusion treatment of expanded graphite and iron oxide and then adding them to the fireproof coating to act as a flame retardant, the usage amount of expanded graphite is greatly increased, solving the problem in the prior art that expanded graphite needs to be used in combination with other flame retardants. Specific Embodiments

[0016] The technical solutions in the present invention will be further described below in conjunction with embodiments.

[0017] A preparation method of an expanded graphite polymer is provided. Iron oxide and expanded graphite with a weight ratio of 1:2 are mixed and ground for 1 h, then subjected to extrusion treatment at 800 - 1300 °C for 0.5 - 1 h, and then ground into a fine powder with a fineness of 10 microns to obtain the expanded graphite polymer. The iron oxide includes iron(III) oxide, iron(II,III) oxide or iron(III) oxide and iron(II,III) oxide with a weight ratio of 1:1.

[0018] According to the components in the following table, a formula for the graphite fireproof coating is provided, specifically as follows (unit: kg):

[0019]

[0020] In the above table: The preparation method of the expanded graphite polymer is: Using iron(III) oxide and iron(II,III) oxide with a weight ratio of 1:1 as the iron oxide, mixing them with expanded graphite at a weight ratio of iron oxide:expanded graphite of 1:2, grinding for 1 h, subjecting to extrusion treatment at 1200 °C for 1 h, and grinding into a fine powder with a fineness of 10 microns;

[0021] The particle size of the expanded graphite is 10 microns, and the particle size of the heavy calcium powder is 10 microns.

[0022] Weigh the ingredients according to the formula in the above table, stir and mix them at 1000 revolutions per minute for 1 hour to obtain the fireproof coating. Referring to GB / T 2408-2021, test the obtained fireproof coating with a CZF-5 vertical burning tester. The size of the specimen is 125 (±5) mm×13.0 (±0.3) mm×3.0 (±0.2) mm. The results are shown in the following table:

[0023] Example 1 2 3 4 LOI(%) 36.7 37.10 37.8 22.5

[0024] It can be seen from the test results that the fireproof coatings provided in Examples 1-3 have better flame retardant properties, which indicates that the flame retardant performance of the expanded graphite polymer is better than that of expanded graphite, and it is more suitable to be used alone as a flame retardant and can also increase the usage amount of expanded graphite at the same time.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A preparation method of a graphite fireproof coating, characterized in that It includes the following steps: Mix and grind iron oxide and expanded graphite, then perform an expansion treatment at 800 - 1300 °C, and then grind it into powder to obtain expanded graphite polymer. Mix 13 - 18% by weight of the expanded graphite polymer, 35 - 40% of styrene-acrylic emulsion, 0.2 - 0.3% of carboxymethyl cellulose, 1 - 1.8% of sodium polyacrylate, 12 - 15% of heavy calcium powder, 0.2 - 0.4% of silicone oil, and the balance is water, and stir and mix evenly to obtain the fireproof coating.

2. The preparation method of the graphite fireproof coating according to claim 1, characterized in that, The expansion treatment time is 0.5 - 1 h.

3. The preparation method of the graphite fireproof coating according to claim 1, characterized in that, The iron oxide includes iron(III) oxide.

4. The preparation method of the graphite fireproof coating according to claim 1, characterized in that, The iron oxide includes iron(II,III) oxide.

5. The preparation method of the graphite fireproof coating according to claim 1, characterized in that, The iron oxide includes iron(III) oxide and iron(II,III) oxide in a weight ratio of 1:

1.

6. The preparation method of the graphite fireproof coating according to claim 1, wherein, The fineness of the expanded graphite polymer is 10 microns.

7. The preparation method of the graphite fireproof coating according to claim 1, characterized in that, The fineness of the heavy calcium powder is 10 microns.

8. The preparation method of the graphite fireproof coating according to claim 1, characterized in that, The stirring and mixing conditions are a time of 1 h and a speed of 100 revolutions per minute.

9. The preparation method of the graphite fireproof coating according to any one of claims 1-8, characterized in that, The weight ratio of the iron oxide to the expanded graphite is 1:

2.

10. A graphite fireproof coating, characterized in that, It is prepared by the method described in any one of claims 1 - 9.

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