JP2001207108A - Formable fire-retardant coating composition for waterproof sheet and fireproofing work of building using the composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foamable ire-retardant coating composition to be applied to a waterproof sheet, having improved adhesivity to the sheet and water- resistance and enabling outdoor use. SOLUTION: The objective foamable fire-retardant coating composition is produced by using a vinylidene chloride polymer, copolymer of vinylidene chloride and an acrylic monomer or an ethylene-vinyl acetate emulsion as a main component and mixing 100 pts.wt. of the main component with 5-25 pts.wt. of a self-emulsifiable epoxy resin, 150-300 pts.wt. of a processed phosphoric acid compound, 100-200 pts.wt. of a polyhydric alcohol, 100-200 pts.wt. of an amine compound, 50-150 pts.wt. of silica sand and water. The coating composition is applied to the exposed waterproofing layer of a building at a dried film thickness of >=0.5 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamable fire-retardant paint composition for a waterproof sheet, and more particularly, to a foamable fire-retardant paint composition having excellent adhesion to a waterproof sheet and excellent water resistance, and a building using the composition. It relates to the fire protection method for objects.

[0002]

2. Description of the Related Art Conventionally, various waterproofing methods such as asphalt waterproofing, resin coating waterproofing, sheet waterproofing and the like have been implemented for rooftop waterproofing of a building, but a sheet or the like which is a combustible material is exposed as it is. become.

Therefore, in order to protect the flammable waterproof layer from fire, a method of covering the waterproof sheet with concrete or a block, or applying a foaming fire-resistant paint on the waterproof sheet has been used.

[0004] However, the method of covering the waterproof sheet with concrete or a block or the like is walkable, and there is no fear of burning by an open fire when a neighboring building is fired.
There are many problems, such as an increase in roof weight.On the other hand, the method of applying fire-resistant foam paint has advantages over the former method in terms of workability, construction cost, and lightening of the roof. Inferior strength, and in combination with thermal insulation,
There was a difficulty in the spread of fire due to a fire such as a fire in an adjacent building.

[0005] In order to solve the above-mentioned problems and to solve the problem of the strength and flame retardancy that can withstand light walking, the present applicant added 100 parts by weight of a solid content of an acrylic or ethylene / vinyl acetate resin emulsion. On the other hand, phosphoric acid compounds 150 to 30
0 parts by weight, polyhydric alcohol 100 to 200 parts by weight, amine compound 100 to 200 parts by weight, fiber length 0.2 to 10 m
15 to 30 parts by weight of short fibers having a m of 50 to 150
Parts by weight, and 50 to 150 parts by weight of silica sand are mixed and formed to find a foamable paint, and the paint is applied to the exposed waterproof layer of the building with a dry film thickness of 1.0 mm or more. Suggested.

[0006]

However, the foamable fire retardant paint is inferior in practical use in adhesiveness to a waterproof sheet and water resistance, and has a problem that it is totally peeled off from the sheet after aging. I wasn't satisfied with the situation.

The present invention has been made in view of the above-mentioned situation, and has been found to add and replace a self-emulsifying epoxy and a foaming agent with a treated phosphoric acid compound in the foamable fire-retardant paint for a waterproof sheet. The purpose of the present invention is to enhance the sheet adhesion of the fire retardant paint, improve the water resistance, and make it possible to use it outdoors.

[0008]

That is, one of the features of the present invention that meets the above-mentioned object is one of the foamable fire-retardant paint compositions to be applied on a waterproof sheet, which comprises vinylidene chloride or acrylic resin. Or self-emulsifying epoxy, a treated phosphoric acid compound, a polyhydric alcohol, an amine compound, and silica sand are added and mixed.

The invention according to claim 2 relates to a specific constitutional example of the coating composition, wherein a self-emulsifying type is added to 100 parts by weight of vinylidene chloride or an acrylic copolymer thereof, or 100 parts by weight of an ethylene / vinyl acetate emulsion. Epoxy 5
25 parts by weight, 150 to 300 parts by weight of the treated phosphoric acid compound,
100 to 200 parts by weight of polyhydric alcohol, amine compound 1
100 to 200 parts by weight and 50 to 150 parts by weight of silica sand are added and mixed. The second feature of the present invention is also a fire protection method in which the foamable fire protection coating composition is applied to the exposed waterproof layer of a building so that the dry film thickness is 0.5 mm or more.

[0010] Thus, the above fire-retardant paint composition can improve the sheet adhesion by adding a self-emulsifying type epoxy, and the water-resistant by replacing a conventional phosphoric acid compound as a foaming agent with a treated phosphoric acid compound. To improve the performance. Here, as the treated phosphoric acid compound,
Preferably, melamine-coated ammonium polyphosphate is used.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, specific embodiments of the present invention will be described in detail.

The present invention relates to a copolymer of vinylidene chloride or acrylic with vinylidene chloride or ethylene.
A foamable fire-retardant paint composition for a waterproof sheet, comprising a self-emulsifying type epoxy, a treated phosphoric acid compound, a polyhydric alcohol, an amine compound and silica sand with respect to a vinyl acetate emulsion (hereinafter abbreviated as a resin emulsion).

Among them, a phosphoric acid compound, a polyhydric alcohol, and an amine compound are used as a component that imparts self-emulsifying epoxy in order to enhance adhesiveness to a waterproof sheet and that imparts fire resistance. Among them, it is an important feature to use a treated phosphoric acid compound which has been subjected to a surface treatment in order to improve the water resistance of the phosphoric acid compound. here,
Examples of the self-emulsifying epoxy used in the present invention include a BPA (bisphenol A) type epoxy resin having an epoxy equivalent of 100 to 1,000.

The amount of the self-emulsifying epoxy added is 5 to 25 parts by weight per 100 parts by weight of the resin emulsion.
Parts by weight are preferred. As the surface-treated phosphate compound, a resin acid or a fatty acid may be mentioned as a surface-treating agent, and the most preferable one is melamine-coated ammonium polyphosphate.

The melamine-coated ammonium polyphosphate is a powdery melamine-coated ammonium polyphosphate in which melamine is added or / and adhered to the surface of powdered ammonium polyphosphate particles represented by the following formula 1.

[0016]

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As the powdery ammonium polyphosphate, a commercially available product can be used as appropriate. Commercially available products include, for example, Sumisafe-P (trademark, manufactured by Sumitomo Chemical Co., Ltd.), Exorit-422 (trademark, manufactured by Hoechst),
Exorit-700 (for consumption, manufactured by Hoechst), Fos-Check P / 40 (trademark, manufactured by Monsanto) and the like, and fine particles of type 2 ammonium polyphosphate can also be used. The melamine used in the present invention may be a commercially available melamine monomer.

Next, when adding and / or adhering melamine to the surface of the powdery ammonium polyphosphate particles, specifically, the powdery ammonium polyphosphate in a state where the added amount of ammonia is not more than a stoichiometric amount is converted to the ammonium polyphosphate. At a temperature at which the particles do not melt, and heated to 250 to 300 ° C., which is a temperature at which melamine can sublime, melamine is added, and the melamine is added to the hydroxyl groups that have become deacidified by the release of ammonia on the ammonium polyphosphate particle surface. Sublimate, add and / or adhere. At this time, the ratio of melamine to be added is 0.5 to 20% by weight, preferably 2 to 10% by weight based on the ammonium polyphosphate. Almost all of the added melamine is added and / or adhered to the ammonium polyphosphate, and a melamine-coated ammonium polyphosphate that can be effectively used in the present invention can be obtained.

The melamine-coated ammonium polyphosphate can be obtained separately by the following means.
That is, melamine is added without passing through a step in which ammonia which is originally added in a stoichiometric amount to ammonium polyphosphate is heated to a state in which the amount of ammonia is insufficient, so that ammonium polyphosphate particles are not melted and melamine is added. By mixing and kneading at a sublimation temperature of 250 to 300 ° C., desorption of ammonia and addition and / or adhesion of sublimed melamine occur simultaneously. At this time, melamine is heated in a reaction vessel heated to a temperature at which melamine can be sublimated, and sublimation of melamine occurs.

In the present invention, addition means a state in which melamine is ionically bonded to an acidic hydroxyl group derived from ammonium polyphosphate. The added melamine is stable even when heated, and does not desorb again. . In addition, adhesion refers to a state in which melamine is adsorbed on the surface of ammonium polyphosphate particles, and melamine adsorbed on the surface of ammonium polyphosphate particles repeats sublimation and adsorption by continuing heating, thereby causing acidic hydroxyl groups and ions. To combine. Thus, the sublimation and addition of melamine and / or
Alternatively, the adhesion is continuously repeated on the surface of the ammonium polyphosphate particles to obtain the powdery melamine-coated ammonium polyphosphate.

As components for imparting fire resistance, in addition to the above-mentioned melamine-coated ammonium polyphosphate, polyhydric alcohols and amine compounds are used. Polyhydric alcohol has a role as a carbonized layer forming agent, pentaerythritol,
Dipentaerythritol, starch and the like are good, and the amine compound is mixed as a blowing agent that decomposes to generate a nonflammable gas, and specifically, melamine, dicyandiamide and the like are preferably used.

The above components are mixed in an amount of 150 parts by weight with respect to 100 parts by weight of the resin emulsion.
The amount is preferably from 300 to 300 parts by weight, and if it is 150 parts by weight or less, the fire resistance is poor. The polyhydric alcohol is preferably used in an amount of 100 to 200 parts by weight based on 100 parts by weight of the resin emulsion. If the amount is less than that, it is difficult to form a carbonized layer. Further, the amount of the amine compound is desirably in the range of 100 to 200 parts by weight. Below this, the degree of foaming decreases. If each component is used outside the above range, a problem of flexibility arises. Accordingly, the use of each of the above ranges is a desirable use range. In the present invention, it is also preferable to use silica sand such as puff powder in addition to the above components from the viewpoint of impact resistance, and is used in the range of 50 to 150 parts by weight. If the amount is less than 50 parts by weight, the strength of the coating film is insufficient, and if it is more than 150 parts by weight, the degree of foaming decreases. In order to improve the coating operation, water may be appropriately added, but if the amount is too large, there is a possibility of outflow, so that it is preferably 5 to 25 parts by weight.

The paint thus formulated and applied as described above is applied to a roof exposed waterproof sheet. In this case, it is important that the dry film thickness is 0.5 mm, and it is important that the dry film thickness be less than 0.5 mm. Then, there is a possibility that the effect of the angle may not be sufficiently obtained. For application, known means such as roller brushing can be applied as needed.

The waterproof sheet material to which the foamable fire-retardant paint composition for a waterproof sheet of the present invention can be applied includes rubber such as EPDM, polyvinyl chloride, polyethylene, olefin-based thermoplastic elastomer, asphalt, modified asphalt, urethane and the like. Waterproof sheet pre-formed from, urethane coating, cement with acrylic or EVA
And various types of waterproof sheets such as a hydrated solidification type coating film containing a resin such as a waterproof sheet which can be formed on site at the site.

[0025]

EXAMPLES Specific examples of the present invention will be described below. Using the following vinylidene chloride / acrylic copolymer, epoxy, phosphoric acid compound, polyhydric alcohol, amine compound, silica sand, water and thickener as the basic formulation according to the formulation shown in each example of Table 1, The paints of Examples 1 to 3 were obtained by substituting the surface-treated phosphoric acid compound, and each of these paints was applied to a sheet at 600 g / m ² using a brush. On the other hand, a paint having a composition different from the above-mentioned basic composition was prepared and used as Comparative Examples 1 to 4, and 600 g / m ² was similarly applied to a sheet using a brush.

(Basic blending use example) Vinylidene chloride / acrylic copolymer emulsion; Aron D-5030 self-emulsifying epoxy; Epiletz WD-510 (oiled shell epoxy) ammonium polyphosphate; Sumisafe P (Sumitomo Chemical) Surface-treated polyphosphoric acid Ammonium; Delage C-80 (Chisso) Dipentaerythritol; Dipentarit (Koei Chemical) Melamine; Melamine (Nissan Chemical)

Each of the samples to which the paints of the respective examples thus obtained were applied was tested according to the following test methods. Weather resistance: Irradiation with weatherometer for 200 hours (visual evaluation of surface condition) Foamability during combustion; Foamed state after fire test according to JIS A1312 Adhesion to rubber sheet; Peeling adhesion between rubber sheet and coating film (kgf / 25 mm) ) Elution resistance; degree of elution after immersion in warm water at 40 ° C for 7 days (%) The evaluation of the test results was also shown in Table 1 and shown as follows.

[0028]

[Table 1]

From the above table, it can be seen that those according to the examples of the present invention are clearly superior in sheet adhesiveness and elution resistance as compared with the comparative examples, and the expected effects can be obtained.

[0030]

As described above, the coating composition of the present invention contains vinylidene chloride or a copolymer thereof with acrylic or ethylene-vinyl acetate emulsion as a foamable fire-resistant coating, and a self-emulsifying epoxy is added. This improves the adhesion to the waterproof sheet and prevents the foamed carbon layer from detaching from the seal after heat foaming, and is used outdoors because the phosphate compound compounded as the foaming agent has poor water resistance. Although it could not be done, by treating this, it can be used outdoors and has the effect of solving the conventional disadvantages.

Further, in the present invention, in the fire protection of a rooftop exposed waterproof sheet of a building, a fire is generated in an adjacent building by applying the foaming fire-resistant paint, and the paint itself is carbonized even if it receives a spark. The foamed sponge formed by the layer prevents the burning of fire, improves the fire prevention effect, enables light walking, improves the coating workability, improves the usability, and makes the roof waterproof. This is a construction method that is expected to be put to practical use in the future as a measure to improve sheet fire prevention.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 133/00 C09D 133/00 E04D 5/10 E04D 5/10 D (72) Inventor Kenji Tabe Nishi-ku, Kobe-shi 589 Kitagawa, Nakatsu Hiranomachi Hirono Kagaku Kogyo Co., Ltd. Nakatsu Plant F-term (reference) 4J038 BA112 CB051 CD081 DB062 HA416 HA446 JA21 JB04 JB36 KA03 KA06 KA08 MA07 MA10 NA12 NA15 PA19 PB05

Claims (5)

[Claims] 1. A self-emulsifying epoxy, which is a foamable fire-resistant paint to be applied on a waterproof sheet, which is mainly composed of vinylidene chloride or acrylic copolymer or ethylene-vinyl acetate emulsion. A foamable fire-retardant paint composition for a waterproof sheet, comprising a phosphoric acid compound, a polyhydric alcohol, an amine compound and silica sand. 2. An emulsion of vinylidene chloride or a copolymer of acrylic acid and vinylidene chloride, or an ethylene / vinyl acetate emulsion 1.
5 to 2 parts by weight of self-emulsifying epoxy
5 parts by weight, treated phosphoric acid compound 150 to 300 parts by weight, polyhydric alcohol 100 to 200 parts by weight, amine compound 10
A foamable fire-retardant paint composition for a waterproof sheet, which is obtained by adding and mixing 0 to 200 parts by weight and 50 to 150 parts by weight of silica sand. 3. The foamable fire-retardant paint composition for a waterproof sheet according to claim 1, wherein the treated phosphate compound is melamine-coated ammonium polyphosphate. 4. A fire protection construction for a building, wherein the coating composition according to claim 1, 2, or 3 is applied to an exposed waterproof layer of the building so as to have a dry film thickness of 0.5 mm or more. Law. 5. A fire protection method for a building wherein the treated phosphate compound is melamine-coated ammonium polyphosphate.