JPS61168676A - Refractory paint - Google Patents

Abstract

PURPOSE:To obtain a refractory paint suppressing temp. rise of metal and emitting no harmful gas during a fire, by compounding a specified epoxy mixture with a phosphoric acid compd., a phosphate frit, a hydrous inorg. compd. and a refractory fiber. CONSTITUTION:A refractory paint prepd. by compounding 100pts.wt. epoxy mixture comprising diglycidyl tetrahydrophthalate or diglycidyl hexahydrophthalate and a curing agent primarily composed of a heterocyclic polyamine compd. with 30-80pts.wt. phosphoric acid compd., 20-80pts.wt. hydrous inorg. compd. and 0.5-20pts.wt. refractory fiber. Ammonium polyphosphate and melamine phosphate are pref. as the phosphate compd. to be used, and hydrous alumina is most pref. as the hydrous inorg. compd. Asbestos, a glass fiber, a phenolic fiber and the like pref. about 0.5-10mm in length are used as the refractory fiber.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fire-resistant paint for protecting metal structures in the event of a fire. [Prior Art] Although metal itself is a noncombustible material, , the temperature of the metal itself increases due to fire, and its mechanical strength decreases, e.g.
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, concrete is an excellent fire- and corrosion-resistant coating, but its disadvantage is that it is extremely heavy.

Covering plates mainly composed of calcium silicate and spray coating materials mainly composed of rock wool are lightweight 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.

Organic fire-resistant coating materials are characterized by superior fire resistance even when the coating thickness is thinner than inorganic 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. Furthermore, 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.

[Problem that the invention seeks to solve]

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 metal structures, does not generate toxic gases such as hydrogen halide, and is lightweight. The purpose is to provide a fire-resistant paint with excellent workability.

[Failure to solve the problem]

The fire-resistant paint of the present invention contains 30 to 80 parts by weight of an epoxy mixture consisting of tetrahydrophthalic acid diglycidyl ester or hexahydrophthalic acid diglycidyl ester and a curing agent mainly composed of a heterocyclic polyamine compound. Parts by weight, phosphate frit 20-80
parts by weight, 20 to 80 parts by weight of a water-containing inorganic compound, and 0.5 to 20 parts by weight of fire-resistant fibers. examples include Epicote 190.191 (manufactured by Shell Chemical Co., Ltd.) and Araldite CY182.183 (manufactured by Ciba Geigy), and examples of heterocyclic polyamine compounds include Epomate C-001,002, B-001,002, N
-001,002 (manufactured by Ajinomoto Co., Ltd.), the mixing ratio of hetetrahydroheptalic acid diglycidyl ester or hexahydrophthalic acid diglycidyl ester and a curing agent mainly composed of a heterocyclic polyamine compound is It is determined stoichiometrically by the epoxy equivalent of the ester compound and the amine value and molecular weight of the curing agent compound.

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, and if it is less than 30 parts by weight, the degree of foaming will be low. The fireproof protection effect is insufficient, and if it exceeds 80 parts by weight, the foaming degree is too high and the strength of the carbonized layer decreases. Ammonium polyphosphate and melamine phosphate may be used alone, but they may also be used in combination.Ammonium monopolyphosphate tends to increase the degree of foaming when heated compared to melamine phosphate buttons, and may cause excessive foaming. Since this causes the carbonized layer to fall during combustion, it is appropriate to use less than half of the amount used in the case of melamine phosphate.As a phosphate frit, 4 from Nippon Horo Glaze Co., Ltd.
The one commercially available as 021 is suitable. This phosphate crit becomes a glassy melt at 390°C,
Forms a strong foam insulation carbonized layer to protect the interior from fire. Phosphate frit addition 1 to epoxy mixture 10
The range is 20 to 80 parts by weight relative 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 the water-containing inorganic compound include water-containing alumina, water-containing magnesium, basic magnesium, and aluminum hydroxycarbonate hydrate. Among these, water-containing alumina is most preferred.

The amount of the water-containing 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 flame retardant 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.

Fire-resistant fibers include asbestos, glass, ceramics,
Phenolic fiber is used, and its length is 0°5-10
The position is good. These fibers serve to control the viscosity of the paint and improve deformation at high temperatures. The amount of fire-resistant fiber added is related to coating workability, and in the case of trowel coating, it is 100,0
Adjust the viscosity to between 00 and 300,000 cps, or 20 for spraying. Preferably, the viscosity is adjusted to between OOO and 50,000 cps. Therefore, epoxy mixture 1
A range of 0.5 to 20 parts by weight relative to 0.00 parts by weight is suitable; if it is less than 0.05 parts by weight, sagging during coating will be large;
If it exceeds the weight part, it will be difficult to apply and the finished appearance will be poor.

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

〔Example〕

Fire-resistant paints were prepared according to the formulations shown in each column of Table 1, and the workability, fire resistance, and corrosion resistance of the paints were evaluated, and the results are shown in the lower column of Table 1.

The evaluation was performed as follows.

(1) Workability: Apply each row of paint to a thickness of 5B on an iron plate with a thickness of 2m and a size of 300m x 300mm. The sag during work and the finished appearance after being left at room temperature for 2 days were examined.

(2) Fire resistance Each row of paint was applied to a 6mx, 20QBx 200mx iron plate to a thickness of 5B and cured. Next, heat the coated surface with a Bunsen burner for 15 minutes, 30 minutes, and 45 minutes.
The temperature of the iron plate on the back side after 90 minutes had passed was measured using a thermocouple. In addition, the burner flame has an internal flame of 60 degrees and an external flame of 15 degrees.
It was set to 0tit.

(3) Erosion thickness: 11 + LIIL, 10 Q + mx Each row of paint was applied to each plate of iron, copper, and aluminum to a thickness of 2 elbows and cured. After curing, the paint was placed in a constant temperature bath at 60°C for 7 hours. As is clear from Table 1, in which the corrosion state of the metal was examined after being held at a certain temperature, Examples 1 to 5, which fall within the scope of the present invention, were well-balanced in each characteristic.

In Comparative Example 1, the content of fire-resistant fiber exceeds the specified value, and the appearance is bad.In Comparative Example 2, the content of phosphoric acid compound exceeds the specified value, and the strength of the carbonized coating film is weak and it falls off. In Comparative Example 3, the phosphate frit exceeds the specified value, resulting in low foaming and insufficient insulation effect.In Comparative Example 4, the hydrated inorganic compound exceeds the specified value, and the viscosity is too high. Comparative example 5 is phosphate-free, with poor workability.
For reference, the fire resistance test (2) was conducted on an iron plate without paint, and the temperature on the back surface of the iron plate was reached 570°C in 15 minutes.

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

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to realize a well-balanced fire-resistant paint with excellent workability, fire resistance, and corrosion resistance.

Claims (1)

[Claims] (1) 30 to 8 parts by weight of an epoxy mixture consisting of tetrahydrophthalic acid diglycidyl ester or hexahydrophthalic acid diglycidyl ester and a curing agent mainly composed of a heterocyclic polyamine compound;
0 parts by weight, 20-80 parts by weight of phosphate frit, 20-80 parts by weight of a hydrous inorganic compound, and 0.5-20 parts by weight of fire-resistant fibers.