JPS61163973A - Fire-resistant paint - Google Patents

Abstract

PURPOSE:To provide a fire-resistant paint which has excellent workability and resistance to fire and corrosion, is lightweight and does not emit harmful gas, by incorporating a phosphoric acid compd., a phosphate salt frit, a hydrated inorg. compd. and a fire-resistant fiber in an epoxy mixture. CONSTITUTION:30-80pts.wt. phosphoric acid compd. (e.g. polyammonium phos phate), 20-80pts.wt. phosphate salt frit which can be converted into a vitreous melt at 390 deg.C, 20-80pts.wt. hydrated inorg. comptd. (e.g. hydrated alumina), 0.5-20pts.wt. fire-resistant fiber (e.g. ceramic fiber) having a length of 0.5-10mm and optionally additives such as colorant, deterioration inhibitor, etc. are blended with 100pts.wt. epoxy mixture of a bisphenol A diglycidyl ether compd. and a hardener mainly composed of a heterocyclic polyamine compd.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION J This invention relates to a fire-resistant paint for protecting metal structures in the event of a fire.

EPrior art J Metal itself is a noncombustible material, but a fire increases the temperature of the metal itself and reduces its mechanical strength. For example, when the temperature of steel reaches 550° C., its strength decreases significantly, causing deformation such as curvature, which ultimately leads to the destruction of the steel structure.

Furthermore, since metal has high thermal conductivity, the temperature of a metal container will rise in the event of a fire, increasing the rate of temperature rise inside and causing damage to the contents.

Inorganic or organic fireproof coatings are used to protect such metal structures from fire.

For example, although concrete is an excellent fire and corrosion resistant coating, 1. The drawback is that it is too heavy.

The coating material mainly composed of calcium silicate and the sprayed coating material mainly composed of rock wool have a light ω and have good fire resistance. However, since it lacks water-blocking properties and adhesive properties, there are problems with the anti-corrosion properties of steel.

Induction-based fire-resistant coating materials are characterized by superior fire resistance even when the coating thickness is thinner than inorganic-based ones.

Currently, water-based fire-resistant paints are used, but the drawback is that it takes a long time for the paint film to dry.

Additionally, in the case of organic fireproof coating materials, the generation of smoke and combustion gas is generally a problem. In particular, when a halogen compound is used as a flame retardant, toxic gas is generated during combustion.

L Problems to be Solved by the Invention The present invention was made based on the above, and suppresses the temperature rise of metal in the event of a fire by coating it on a metal structure, and furthermore, it suppresses the temperature rise of metal in the event of a fire. The purpose of the present invention is to provide a fire-resistant paint that does not generate toxic gas, is lightweight, and has excellent workability.

[Means for Solving the Problems J] The fire-resistant paint of the present invention contains a phosphoric acid compound based on 100 parts by weight of an epoxy mixture consisting of a diglycidyl ether compound of bisphenol A and a curing agent mainly composed of a heterocyclic polyamine compound. 30 to 80 parts by weight, 20 to 80 parts by weight of phosphorus Wi salt frit, 20 to 80 parts by weight of water-containing ** compound,
It is characterized by containing 0.5 to 20 parts by weight of fire-resistant am.

Examples of diglycidyl ether compounds of bisphenol A include Epicote 815.828 (manufactured by Shell Chemical Co.) and Araldite GY1252JP (manufactured by Ciba Geigy). As the heterocyclic polyamine compound, Evomate C-〇〇1.002, B-001,0
02, N-001,002, etc.

The mixing ratio of the diglycidyl ether compound of bisphenol A and the curing agent mainly composed of a heterocyclic polyamine compound is stoichiometrically determined by the epoxy equivalent of the diglycidyl X-thyl compound and the amine value and molecular weight of the curing agent compound. It is.

As the phosphorus compound, ammonium polyphosphate and melamine phosphate are suitable. The amount of the phosphorus compound added is in the range of 30 to 80 parts by weight per 100 parts by weight of the epoxy mixture; if it is less than 30 parts by weight, the degree of foaming will be low and the fire protection effect will be insufficient; if it exceeds 80 parts by weight, the degree of foaming will be insufficient. is too high and the strength of the carbonized layer decreases. Ammonium polyphosphate and melamine phosphate may be used alone or in combination. Ammonium polyphosphate is mela phosphate.
・Compared to melamine phosphate, it tends to increase the degree of foaming when heated, and excessive foaming can cause the carbonized layer to fall during combustion, so a durability of 172 or less, which is the case with melamine phosphate, is suitable. There is.

As the phosphate frit, 4 from Nihon Horo Glaze Co., Ltd.
021 with m- is suitable. This phosphate frit becomes a glassy melt at 390°C,
Forms a strong foam insulation carbonized layer to protect the interior from fire. The amount of phosphate frit added is 1 boxy-based mixture 10
The range is 20-80 parts by weight to 0 parts by weight, and 20 parts by weight.
If it is less than 80 parts by weight, the strength of the carbide will not be sufficient, and if it exceeds 80 parts by weight, the degree of foaming will decrease.

Examples of hydrated inorganic compounds include hydrated alumina, hydrated magnesium, and fXAJ! % magnesium, aluminum hydroxycarbonate hydrate, etc. Among these, hydrated alumina is most preferred.

The amount of the hydrous inorganic compound added is in the range of 20 to 80 parts by weight per 100 parts by weight of the epoxy mixture; if it is less than 20 parts by weight, the N combustion effect will be poor, and if it exceeds 80 parts by weight, the degree of foaming will be limited. , and the carbonized layer becomes brittle.

Asbestos, glass, ceramics, and phenolic materials are used as refractory materials. Its length is 0.5~
10#1llI is good. These fibers serve to control the viscosity of the paint and improve deformation at high temperatures. The addition M of fire-resistant fibers is related to coating workability, and in the case of troweling, it is 100. Adjust the viscosity to Goo~300.0OOcps, 20.000~50.0oooc for spray
Preferably, the viscosity is adjusted to ps. Therefore, a range of 0.5 to 20 parts by weight per 100 ffl parts of the epoxy mixture is acceptable; if it is less than 0.5 parts by weight, the sag will be thick when coating (and if it exceeds 20 parts by weight, the coating will be difficult). is difficult,
The finished appearance will deteriorate.

In the present invention, in addition to the above-mentioned components, various coloring agents, deterioration inhibitors, small amounts of mesimine, and polyhydric alcohols may be added as necessary.

[Example J A fire-resistant paint was prepared according to the formulation shown in each example in Table 1, and the workability, fire resistance, and corrosion resistance of this paint were evaluated, and the results are shown in the lower column of Table 1.

The evaluation was performed as follows.

(1) Work: Apply each paint to a thickness of 5 seconds on a 2m thick, 300m x 300m iron plate. The finished appearance after 20 years of sagging during work and air temperature was examined.

+21 Fire resistance Thickness 6a++, 200IIIRX 20011II iron plate was coated with each paint to a thickness of 5m+ and cured. Next, heat the coated surface with a Bunsen burner for 15 minutes.
The temperature of the iron plate on the back side after 30 minutes, 45 minutes, and 60 minutes was measured using a thermocouple. In addition, the inner flame of the burner is 60g.
, the external flame was set to 150 seconds.

(3 Corrosion Resistance) Each paint was applied to a thickness of 2411 on iron, steel, and aluminum plates measuring 100 shoes x 100 shoes, each having a thickness of 1 mgm, and cured.Then, the coating was cured in a constant temperature bath at 60°C for 7 hours. After being held inside, it was taken out and the corrosion state of the metal was examined.

As is clear from Table 1, Example 1 within the scope of the present invention
~5 has a well-balanced property.

Comparative Example 1 has a fire-resistant TfAH with a value of 3m exceeding the specified value and has a poor appearance. In Comparative Example 2, the content of the phosphoric acid compound exceeded the specified value, and the strength of the carbonized coating film was weak and fell off. In Comparative Example 3, the phosphorylated salt frit was greater than the specified value, so there was little foaming and the heat insulating effect was insufficient.

In Comparative Example 4, the water-containing inorganic compound exceeds the specified value, and the viscosity is too high, resulting in poor workability. In Comparative Example 5, the phosphoric acid salt frit and the water-containing inorganic compound exceeded the specified values, so there was little foaming and the heat insulation effect was insufficient.

For reference, regarding the iron plate without paint (when we conducted the fire resistance test in step 2, the temperature on the back side of the iron plate was 570℃ in 15 minutes)
reached.

Although the above examples are data for flat plates, it goes without saying that the paint of the present invention can also be applied to structures with rough shapes, such as pipes, conduits, and shaped steel.

"Effects of the Invention 1 and Beyond" - As explained above, according to the present invention, it is possible to realize a fire-resistant paint that is excellent in workability, fire resistance, and corrosion resistance, and is well-balanced.

Claims (1)

[Claims] (1) 30 to 80 parts by weight of a phosphoric acid compound and 20 to 80 parts by weight of a phosphate frit to 100 parts by weight of an epoxy mixture consisting of a curing agent mainly consisting of a diglycidyl ether compound of bisphenol A and a heterocyclic polyamine compound. parts, 20 to 80 parts by weight of hydrated inorganic compound, 0.5 parts of fire-resistant fibers
A fire-resistant paint characterized by containing ~20 parts by weight.