JP4569936B2 - Foam fireproof paint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fire-resistant paint applied to a steel frame or concrete of a building, and more specifically, not only forms a foamed layer uniformly under heating in the event of a fire but also carbonizes well in the foamed layer. The present invention relates to a foam-type refractory paint capable of effectively insulating by holding a layer.
[0002]
[Prior art and its problems]
The steel frame of a building is a non-combustible building material. However, the strength of the steel frame is significantly reduced under heating in the event of a fire and may lead to the collapse of the entire building. Protected and prevented sudden drop in strength.
[0003]
As this fireproof covering material, conventionally, a spray material in which a lightweight aggregate such as slag wool is mixed with a cement-based inorganic binder and kneaded with water has been used.
However, since the coating material requires a thickness of 30 mm or more for the steel frame, there are not only restrictions on the construction method but also the unevenness of the coating surface is severe, and it is not suitable for parts that require an aesthetic appearance utilizing the design of the steel frame itself. It was appropriate.
[0004]
Accordingly, various fire-resistant fire-resistant paints in which an organic binder is mixed with a foaming agent, a carbon generating material, or the like have been proposed as fire-resistant coating materials suitable for parts requiring aesthetic appearance (for example, Japanese Patent Application Laid-Open No. 49-132821). JP-A-5-86310). The paint film is decomposed by heat in the event of a fire, generates non-combustible gas, and foams to form a porous carbonized layer. This becomes a heat insulation layer and suppresses the temperature rise of a steel frame. According to the paint, a thin film can be formed on the surface of the steel frame, which is advantageous in terms of design.
[0005]
However, in the conventional paint, the foamed shape at the time of heating is non-uniform, and since the ratio of the carbonized layer occupying this is low, the heat insulating effect is insufficient, and further, when the heating proceeds, In some cases, the adhesion of the steel layer deteriorates, and the carbonized layer itself falls off and collapses, exposing the substrate, and cannot function as a heat insulating layer.
[0006]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have found that by containing a specific flame retardant, the carbonized layer can be well retained in the foamed layer and effectively insulated. The invention has been reached.
[0007]
That is, the present invention includes a foaming agent of 150 to 1100 parts by weight, a carbon supply agent of 25 to 300 parts by weight, an inorganic powder of 20 to 200 parts by weight, and a flame retardant of 5 to 100 parts by weight with respect to 100 parts by weight of resin solids. The present invention provides a foam-type fireproof paint characterized by using a styrene acrylic resin as the resin and using tris (tribromoneopentyl) phosphate and / or a condensate thereof as a flame retardant .
[0008]
Hereinafter, the present invention will be described in detail.
[0009]
The resin used in the present invention is a coating film forming component, and examples thereof include acrylic resins, olefin acrylic resins, alkyd resins, melamine resins, and epoxy resins. Among these, styrene acrylic resins are coating workability, pigment dispersibility, etc. From the point of view, it is preferable.
[0010]
Examples of the blowing agent used in the present invention include dicyandiamide, azodicarbonamide; melamine, urea, guanidine; phosphates such as ammonium polyphosphate; polyol, chlorinated paraffin, potassium hydrogen carbonate, dinitrosopentamethylenetetramine, barium. An azodicarboxylate etc. are mentioned, These can be used 1 type or in mixture of 2 or more types. Of these, the combined use of phosphates such as ammonium polyphosphate, melamine, and chlorinated paraffin is preferable from the viewpoint of balance between the expansion ratio and the strength of the foam layer.
[0011]
The content of the foaming agent is suitably in the range of 150 to 1100 parts by weight, preferably 300 to 800 parts by weight with respect to 100 parts by weight of the resin solid content. Particularly, 100 to 500 parts by weight of ammonium polyphosphate, preferably 200 to 400 parts by weight, 25 to 300 parts by weight of melamine, preferably 50 to 200 parts by weight, and chlorinated paraffin with respect to 100 parts by weight of resin solids. Is preferably contained in the range of 25 to 300 parts by weight, preferably 50 to 200 parts by weight. If the content of the ammonium polyphosphate is less than 100 parts by weight, the foaming ratio is low and it is difficult to form a carbonized layer. On the other hand, if it exceeds 500 parts by weight, bubbles in the foamed layer are coarsened and adhesion to the base is reduced. Absent. On the other hand, if the melamine content is less than 25 parts by weight, the foamed layer is soft and easily collapsed. On the other hand, if it exceeds 300 parts by weight, the expansion ratio is undesirably low. Further, when the content of chlorinated paraffin is less than 25 parts by weight, the foaming ratio is low. On the other hand, when it exceeds 300 parts by weight, the bubbles in the foamed layer are coarsened and become hollow and easily collapse, which is not desirable.
[0012]
As the carbon supply agent, for example, polysaccharides, polyhydric alcohols, graphite and the like can be used, but polyhydric alcohols such as mono, di and tripentaerythritol are suitable.
[0013]
The content of the carbon supply agent is suitably in the range of 25 to 300 parts by weight, preferably 50 to 200 parts by weight with respect to 100 parts by weight of the resin solid content. When the content of the carbon supply agent is less than 25 parts by weight, the expansion ratio is low and it is difficult to form a carbonized layer. On the other hand, when the content exceeds 300 parts by weight, the foamed cells are coarse, and the foamed layer itself tends to sag and crack. This is not desirable.
[0014]
Examples of the inorganic powder include titanium oxide, aluminum oxide, mica, silica, clay, clay, silicate, carbonate and the like, and these can be used alone or in combination.
[0015]
The content of the inorganic powder is suitably in the range of 20 to 200 parts by weight, preferably 30 to 150 parts by weight with respect to 100 parts by weight of the resin solid content. If the content of the inorganic powder is less than 20 parts by weight, bubbles in the foamed layer are not uniform and adhesion to the base is lowered. On the other hand, if it exceeds 200 parts by weight, the coating workability is adversely affected and the coating film may be cracked. This is not desirable.
[0016]
In the present invention, a bromine-containing phosphate ester having a melting point of 150 ° C. or higher, preferably 170 to 250 ° C. and a bromine content of 50 wt% or higher, preferably 50 to 80 wt%, and / or a condensate thereof are used as flame retardants. . If the melting point of the flame retardant is less than 150 ° C., the flame retardant decomposes faster than the foaming agent, so that no effect can be obtained in forming a carbonized layer in the foamed layer, and even if the bromine content is less than 50% by weight, the carbonized layer Since an effect is not acquired in formation of this, it is not preferable.
[0017]
Examples of the bromine-containing phosphate ester include tris (tribromoalkyl) phosphate having a branched alkyl group having 5 or more carbon atoms and condensates thereof. Among these, tris (tribromoneopentyl) phosphate- And / or condensates thereof are preferred.
[0018]
The content of the flame retardant is suitably in the range of 5 to 100 parts by weight, preferably 20 to 80 parts by weight with respect to 100 parts by weight of the resin solid content. If the content of the flame retardant is less than 5 parts by weight, the effect of forming the carbonized layer cannot be obtained. On the other hand, if it exceeds 100 parts by weight, the coating film may be cracked over time, which is not desirable.
[0019]
In addition to the above-described components, the paint of the present invention may further contain usual paint additives such as deterioration inhibitors, colorants, dispersants, organic solvents and water.
[0020]
The coating composition of the present invention can be applied to various base materials such as steel frames and concrete by an ordinary coating method such as brush or spray.
[0021]
Particularly for steel frames, it is desirable that the paint of the present invention is applied after being rusted by blasting or the like and then undercoated with a shop primer or undercoat. The fireproof coating surface to be formed can be further subjected to intermediate coating and top coating as necessary.
[0022]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
[0023]
Examples and comparative examples Each blending component was mixed in the blending amounts shown in Table 1 to prepare each foam-type fireproof paint. (* 1) to (* 7) in the table are as follows.
[0024]
(* 1) Resin: “Priolite”, manufactured by Goodyear, styrene acrylic resin, solid content 100%
(* 2) Tris (tribromoneopentyl) phosphate: melting point about 181 ° C., bromine content 70% by weight
(* 3) Tetrabromophthalate ester: liquid, bromine content 45% by weight
(* 4) Tetrabromobisphenol A: Melting point: about 180 ° C., bromine content: 59 wt% (* 5) Dodecane bromodiphenyl oxide: Melting point: about 300 ° C., bromine content: 83 wt%
(* 6) Tris (dibromopropyl) phosphate: liquid, bromine content 69% by weight
(* 7) Diluent: A mixture of mineral spirits and xylene
Performance test Grit blasted 300 × 300 × 3.2 mm steel sheet as a base material, and each foamed fireproof paint obtained above is spray-coated on this to a thickness of about 2 mm in dry film thickness. Each test coating plate was prepared by curing for about 2 weeks.
[0025]
The obtained test coating plate was installed in an electric furnace and subjected to a fire resistance test in which the test coating plate was heated to a predetermined temperature with respect to the elapsed time so as to follow the standard heating curve shown in JIS-A-1304. One hour later, when the heating temperature reached 925 ° C., the test was terminated, and the foaming state of the fireproof coating film on the test coating plate was observed and evaluated for the following items. The evaluation results are shown in Table 1.
[0026]
(Uniformity of foam layer)
○: The entire surface is uniformly foamed and good △: There is a non-uniform portion in part and is slightly defective ×: The entire surface is uneven and defective (sagging of the foam layer)
○: Good with no sagging cracks △: Some sagging cracks, somewhat poor ×: Sagging cracks on the entire surface, bad (foam of the foam layer)
The foam layer was cut out and the cross section was observed.
[0027]
○: Good with no cavities △: Small cavities are seen, slightly poor ×: Large cavities are seen, poor (foaming ratio)
The expansion ratio was examined from the thickness of the foam layer relative to the coating film thickness.
[0028]
○: 35 times or more Δ: 25 times or more to less than 35 times x: less than 25 times Among these, the ratio of the carbonized layer in the foamed layer was examined.
[0029]
○: 80% or more Δ: 50-80%
X: Less than 50% (strength of foam layer)
The foamed layer was pressed from above with a finger and pressed to examine its hardness and toughness.
[0030]
○: Hard and does not break easily, good △: Somewhat poor hardness and toughness ×: It is fragile and breaks immediately, poor (adhesion with substrate)
When the foamed layer was cut out, the adhesion with the substrate was examined.
[0031]
○: Good △: Adhered to the base material, but can be easily peeled ×: There is a portion that is not attached to the base material due to a cavity [0032]
【The invention's effect】
The foam-type fire-resistant paint of the present invention contains a specific flame retardant, so that the flame retardant promotes dehydration to carbonization of the carbon supply agent, and floats on the surface of the coating film and is generated from blocking of the blowing agent and decomposition of the foaming agent. In order to suppress the volatilization of nonflammable gases such as ammonia and chlorine gas, the carbonized layer can be held well in the foamed layer to effectively insulate, and excellent fire resistance can be obtained.
[0033]
[Table 1]

Claims (1)

A coating containing 150 to 1100 parts by weight of a foaming agent, 25 to 300 parts by weight of a carbon supply agent, 20 to 200 parts by weight of an inorganic powder, and 5 to 100 parts by weight of a flame retardant with respect to 100 parts by weight of resin solids, Styrene acrylic resin is used as the resin, tris (tribromoneopentyl) phosphate and / or its condensate is used as a flame retardant , and ammonium polyphosphate, melamine, and chlorinated paraffin are used in combination as a foaming agent. Foam-type fireproofing containing 100 to 500 parts by weight of ammonium polyphosphate, 25 to 300 parts by weight of melamine, and 25 to 300 parts by weight of chlorinated paraffin with respect to 100 parts by weight paint.