JP2001164192A - Expandable type fire-resistant coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expandable type fire-resistant coating capable of forming an expandable layer which expands sufficiently but not too much. SOLUTION: The expandable type fire-resistant coating comprises as a binder a synthetic resin having a melt flow rate (MFR value) of 5-120 g/min. This fire-resistant coating can stably form an expandable layer and causes neither insufficient expansion nor missing of an expandable layer due to excessive expansion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof covering material used for protecting steel materials used for steel columns and beams from fire, which is foamed when exposed to a fire to provide heat insulation. The present invention relates to a fire-resistant paint for forming a layer. Therefore, the application field is the construction field.

[0002]

2. Description of the Related Art Conventional fire-resistant paints have difficulty in controlling foaming, causing the foamed layer to fall off due to excessive foaming, cracking of the foamed layer due to uneven foaming, and weakness of adhesion of the foamed layer to a steel base. However, due to insufficient strength of the foam layer itself, sufficient fire resistance cannot be exhibited.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to realize a foam layer which is hard to fall off by controlling foaming in a well-balanced manner and to obtain excellent fire resistance.

[0004]

According to the invention of claim 1 of the present application, JIS K7 of a synthetic resin blended in a foam type refractory paint containing a synthetic resin as a binder.
Melt flow rate based on Melt Flow 210
Rate: MFR value) is a test weight of 2.16 kg,
5 to 120 g / 10 under the condition of a test temperature of 120 ° C.
The gist is to use those that are in min.

According to a second aspect of the present invention, in the first aspect of the present invention, the constituent material of the paint contains a component which decomposes and foams by heating, and its decomposition temperature is in the range of 150 to 350 ° C. And

Hereinafter, the components of the present invention and related technologies will be described. Generally, foamed refractory paints made of synthetic resins are softened by heating, so that the synthetic resin, which is a binder of the paint, is softened, and then the constituent materials for forming a foamed heat insulating layer such as a foaming agent, a carbonized layer forming material, and a flame retardant. Decomposition and foaming were caused.

The synthetic resin used for the foam type refractory paint of the present invention has a melt flow rate (MFR value) based on JIS K 7210 having a test load of 2.16 kg and a test temperature of 120 ° C. Under conditions, it must be 5-120 g / 10 min. This test is obtained by passing a molten synthetic resin polymer through a die (L: D = 3.8) at a constant temperature and measuring the number of grams of effluent for 10 minutes.

[0008] The synthetic resin plays a role of giving adhesion and weather resistance of the coating film at normal temperature. When the MFR value is less than 5, the softening of the resin by heating is insufficient, the gas generated by the decomposition of the foaming agent and the flame retardant is suppressed, and a sufficient foamed heat insulating layer is not formed. When the MFR value exceeds 120, the resin is too soft, and the generated gas breaks through the coating film, so that a foamed layer is not formed or the foamed heat insulating layer is dropped off due to excessive foaming.

The synthetic resin used in the present invention is MFR
Any type can be used as long as the value is 5 to 120 g / 10 min. Examples include melamine resin, acrylic resin, alkyd resin, vinyl chloride resin, vinyl acetate resin, urethane resin, epoxy resin, silicone resin, polyester resin, and the like. These resins may be used alone or may be copolymerized, and may be used as a mixture. Further, as the form of these resins, those dissolved in an organic solvent or those dispersed in water as an emulsion can be used.
Add a plasticizer (eg, trichlorophosphate, texanol, etc.), low melting point resin, or oligomer to the synthetic resin,
It is also possible to control the MFR value within the above range.

The compounding amount of the synthetic resin in the refractory paint is as follows:
In terms of solid content, the weight ratio in the coating material is selected from 5 to 45% by weight, and is preferably in the range of 10 to 25% by weight.

The decomposition temperature of the constituent material which is decomposed and foamed by heating to form the foamed heat insulating layer is preferably in the range of 150 to 350 ° C. or less. When the decomposition temperature is lower than 150 ° C., a decomposition gas is generated before the synthetic resin is sufficiently softened, and the foamed heat insulating layer is not formed. If the temperature is higher than 350 ° C., the synthetic resin is excessively softened, and the generated decomposed gas cannot be captured. Thus, the foamed layer is not formed, or the foamed heat insulating layer falls off due to excessive foaming. Further, if the melting point viscosity of the synthetic resin is too low, it may lead to sagging of the coating film.

Examples of constituent materials which are decomposed and foamed by heating to form a foamed heat insulating layer include pentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, triethylene glycol, sorbitol, resorcinol, glycerin, trimethylolmethane , Polyhydric alcohols such as trimethylolpropane, diethylene glycol, propylene glycol, hexamethylene glycol, carbohydrates such as starch and casein, dicyandiamide, azodicarbonamide, derivatives thereof such as hexamethoxymethylmelamine, urea, butylmelamine and trimethylol Melamine, hexamethylolmelamine, urea, dimethylurea, guanylureaphosphate, aminoguanylurea,
Nitrogen-containing compounds such as urea formaldehyde, aminoacetic acid, and guanidine; phosphates such as ammonium phosphate, ammonium polyphosphate, melamine phosphate, and melamine polyphosphate; hydroxides of alkali metals such as aluminum hydroxide and magnesium hydroxide; These can be used in the form of microcapsules. Among them, it is desirable to use a combination of pentaerythritol, dipentaerythritol, ammonium polyphosphate, and melamine from the balance of the decomposition temperature.

[0013] Expandable graphite can be added to the foam type refractory paint of the present invention. By adding the expandable graphite, a paint having a thinner film and higher fire resistance can be obtained.

[0014] In addition to the above-mentioned main components, the following components conventionally added to fire-resistant paints are added to the foamed fire-resistant paint of the present invention within a range not to impair the effects of the present invention. Its components include calcium carbonate, aluminum hydroxide, titanium oxide, alumina, silica, inorganic fibers,
Fillers such as rock wool, flame retardants such as halogen-based, phosphorus-based, antimony trioxide-based, and defoamers, dispersants,
Surfactants such as wetting agents, solvents such as film-forming aids, antifreezing agents, coloring pigments, extender pigments, metal soaps, stabilizers, thickeners for adjusting viscosity and viscosity, preservatives, fungicides, etc. There are components used in ordinary paints.

The foam type refractory paint of the present invention can be applied by a usual paint application method such as brushing or spraying, and can also be applied with a trowel or a roller.

The foamed refractory paint of the present invention is used as a base for not only steel frames but also aluminum, galvanized sheets, asbestos cement boards and the like. Also, wood, plywood,
It is also useful for making flammable substances such as paper and fiber semi-flammable or flame-retardant. Other than that, it is also effective for covering electric cables.

It is also possible to apply an undercoat by a primer treatment (eg, in the case of a steel frame, an anticorrosive paint, etc.) and then apply a foam type refractory paint. After applying the foam type refractory paint of the present invention, intermediate coating for the purpose of improving appearance and durability,
It is also possible to apply a top coat.

[0018]

EXAMPLES Table 1 below shows the formulations of Examples and Comparative Examples, and describes the fire-resistant paint of the present invention. However, these examples are intended to explain the present invention, but not to limit it. In the table, the compounding amount of the synthetic resin represents the solid content weight. The synthetic resin 4 has a MFR value of 102 by adding a plasticizer. The measurement conditions for the MFR value are as follows:
The test weight is 2.16 kg and the test temperature is 120 ° C.

[0019]

[Table 1]

[0020]

[Test method] 300mm x 300mm blasted
× A 9 mm thick SS400 steel sheet was spray-coated with a foamed refractory paint of the composition of the example or the comparative example to a thickness of 2 mm and cured for 21 days to prepare a test body. When coating the refractory paint, each paint was diluted with a solvent and adjusted to have a viscosity of 30 to 35 dPa · s. The test body was subjected to a heating test according to the standard heating curve of JIS A 1304, and the back surface temperature of the steel sheet was measured with a K thermocouple.

The evaluation was performed by observing the time (minute) when the back surface temperature of the steel material reached 500 ° C. and the appearance of the test specimen after the heating was completed. Regarding the appearance of the test piece, the presence or absence of cracks in the foam layer and the falling off of the foam layer were visually confirmed. The cracks in the foam layer are completely free of cracks: ○, cracks are generated, and the width of the crack is less than 1 mm. Δ, the crack width is 1 mm or more. × × The foam layer is not dropped at all. Thing… ○, the whole 20
%: Less than 20% of the total: ... x

[0022]

【result】

* Measurement is not possible because the foam layer has fallen off.

[0023]

According to the present invention, foaming is sufficiently performed,
In addition, a foam-type fire-resistant paint having excellent fire-resistance performance that does not cause excessive foaming can be obtained.

[Procedure amendment]

[Submission date] October 26, 2000 (2000.10.
26)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

[0019]

[Table 1]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[0022]

【result】

[Table 2] * Measurement is not possible because the foam layer has fallen off.

Claims (2)

[Claims] 1. A JIS of synthetic resin blended in a foam type refractory paint containing a synthetic resin as a binder.
Melt flow rate based on K 7210 (Melt Fl
ow Rate (MFR value) is equal to the test weight 2.16.
kg, 5 to 120 g under the condition of test temperature 120 ° C
A foam type refractory paint characterized in that the paint at / 10 min is used. 2. A constituent material of a paint contains a component which decomposes and foams by heating, and has a decomposition temperature of 150 to 35.
The foam type refractory paint according to claim 1, wherein the temperature is in a range of 0 ° C.