JPS6072964A - Method for finish coating fireproof wall of oil supply facilities - Google Patents

Abstract

PURPOSE:To obtain a coating film which does not cause failure over a long period of time, by undercoating a concrete block wall having a mortared inner surface with a specified aq. coating compsn. and then top coating with a synthetic resin paint. CONSTITUTION:2-15wt% (on a solid basis) emulsion (A) of an acrylic resin having an MW of 50,000-300,000, 1-5wt% (on a solid basis) emulsion (B) of an epoxy resin having an average MW of 350-1,000, 25-70wt% filler (C) having a particle size of 50-1,000mu such as CaCO3, 20-60wt% cement (D), 1-5wt% color pigment (E) and 0.8-1.2 equivalents (per equivalent of the epoxy group of component B) of a hardener and additives such as dispersant, anti-foaming agent, etc. are mixed together in such a proportion as to give a weight ratio of A+B/D of 0.15-0.28. 15-70pts.wt. water is blended with 100pts.wt. said mixture to obtain an aq. coating compsn. having a viscosity of 50-1,000P. The inner surface of a concrete block wall is mortared, coated with said compsn., dried and then topcoated with a synthetic resin paint.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of painting and finishing fire walls of fuel supply facilities, etc. Conventionally, fire walls were provided around fuel facilities, etc. (for example, gas stations) for the purpose of preventing the spread of fire to neighboring houses. Normally, this fire wall has a thickness of 10 to 2 mm on the inside (store side) and top surface.
It is made of concrete blocks covered with mortar of about 0++W. The inside (mortar metal trowel surface) of the firewall is generally painted with paint for decoration, stain prevention, and other purposes. It is said that a moisture content of 10 parts or less and -10 parts or less is an appropriate coating condition in order to prevent the paint film from cracking due to the moisture contained in the mortar and to prevent the occurrence of efflorescence.

The specifications for painting the rutal metal trowel surface of the firewall as described above are: (1) Vinyl chloride resin enamel finish (2 coats of vinyl chloride resin sealer and vinyl chloride resin enamel paint), (2) Acrylic resin enamel paint finish ( (2 coats of vinyl chloride resin sealer + acrylic resin enamel paint) 1 (3) Acrylic-urethane resin enamel paint finish (2 coats of epoxy resin undercoat acrylic-urethane resin enamel paint) is the most common.

However, in general, fire walls such as fuel supply facilities have concrete blocks exposed on the back and sides, and the top surface is made of unpainted mortar, making it impossible to prevent rainwater from penetrating inside. Even if you select the optimal conditions during painting and use a coating system with excellent water resistance, many blisters will appear on the paint film after one year of painting, and the paint film will peel off from the blistered areas in the second year. It becomes a state where

Therefore, conventionally, it was necessary to recoat about once every two to three years.

The present invention has been made in view of the prior art as described above.
The present invention aims to provide a coating finishing method that does not cause paint film defects such as blistering and peeling over a long period of time, even though the coating is applied only to the mortar metal trowel surface of a firewall as in the past.

That is, the present invention provides a method for finishing a fire prevention wall such as a refueling facility, in which the inner surface of a concrete block wall is finished with cement mortar and then painted. Solid content 2~
15 Weight List (11) Epoxy Emulsion Resin Solid Content 1-5 Weight List, 011) Filler 25-70 Weight List Cement 20-60! Color pigment 1 to 5% by weight, 6/l Contains the necessary amount of curing agent and other additives for the epoxy emulsion resin, and C(i) +
(ii) ) / Rei = 0.15 to 0.28 (weight ratio)
(b) 100 parts by weight of a mixture in the range of (b) 1 part of water;
Relating to a method for painting and finishing fire walls of fuel supply facilities, etc., which comprises undercoating a water-based coating composition of 5 to 70 parts by weight and then topcoating with a synthetic resin paint.
As shown in the figure, concrete block 11 mortar cape part 2. Mortar gold trowel surface 3. As described above, the coating film 4 is formed by coating (a) (1) acrylic emulsion resin solid content 2 to 2 on the mortar metal trowel surface in the method of the present invention.
To 15 weight (11) Engineering I xy emulsion resin solid content 1 to 5 weight (lii) Filler 25-70 weight, 4V) Cement 20 to 60 weight (b) Color pigment 1 to 5 List IVD Said epoxy It consists of the necessary amount of curing agent and other additives for the emulsion resin.
(11)]/4φ=100 parts by weight of a mixture in the range of 0.15 to 0.28 (weight ratio), and (b) water 15 to
Prime with an aqueous coating composition consisting of 70 parts by weight.

The acrylic emulsion resin used in the aqueous undercoat coating composition of the present invention can be commercially available, but especially acrylic acid or methacrylic acid alkyl ester copolymers (alkyl ester has 1 to 8 carbon atoms). Alternatively, an acrylic emulsion resin which is a copolymer of the above-mentioned acrylic acid or methacrylic acid alkyl ester and styrene (styrene content is 30% by weight or less) is preferable.

The carbon number of acrylic acid, which is a component constituting the acrylic acid or methacrylic acid ester copolymer emulsion resin, is 1.
-8 alkyl ester monomers, alkyl esters of C1-8 alkyl esters of methacrylic acid -T-/mer, include methyl, ethyl, n-butyl, isobutyl, tert-butyl, 2-ethylhexyl, (ndyl, globil). , Inglovir, 1lee-butyl ester, etc. are typically used.Esters with carbon numbers of 9 or more may generate dull substances during emulsion polymerization, or the emulsion particles may become highly hydrophobic, making it difficult to synthesize emulsion resins for mixing with cement. In addition, copolymerized emuls and Noyon resins of acrylic acid (or methacrylic acid ester) and styrene are also preferably used, but if styrene is used in an amount of 30% by weight or more, the weather resistance of the resulting emulsion coating film may deteriorate. There is a tendency for sexual performance to decrease.

Particularly preferred acrylic acid or methacrylic esters are methyl methacrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate, and when styrene is used, it is particularly preferably 20% by weight or less. If necessary, it is also possible to copolymerize several weight percent of functional group monomers such as acrylic acid, methacrylic acid, and 2-hydroxyethyl methacrylate. Advantageously, the molecular weight of these acrylic emulsion resins is from 50,000 to 300,000, preferably from 100,000 to 200,000. In addition, the minimum film forming temperature is 5
The temperature is preferably below 0.degree. C., and if it is higher than that, cracks and cracks are likely to occur during film formation. Further, the acrylic emulsion resin preferably has a viscosity of 100 cps or less when the solid content is 40% by weight. If it exceeds that range, it is necessary to increase the amount of water to lower the viscosity, which lowers the solids content and makes it easier for cracks and cracks to occur due to fading during drying of the coating.

These resins have a solid content of 2 to 2 in the mixture (a).
It is blended in a proportion of 15% by weight. If the resin content is less than 2% by weight, the initial hardness and weather resistance of the coating film will decrease, and efflorescence will likely occur. On the other hand, if the resin content exceeds 15% by weight, thick film coating (approximately 1 to 10 vm) will not be possible, and cracks and
Cracks are more likely to occur.

Furthermore, the epoxy emulsion resin used in the aqueous coating composition of the present invention is preferably a bisphenol-type emulsion resin! It is a resin. Bisfe/-yW Engineering I
Aromatic diglycidyl ethers obtained from bisphenol A and epichlorohydrin and having an average molecular weight of 350 to 1000 are prepared by water dispersion using an emulsifier, and the solid content of the resin is as follows: 1 to 5% by weight are used in the above mixture (,). If the weight of the epoxy emulsion resin is less than 119 feet per weight, the adhesion to the substrate will be reduced, and if it exceeds 4% by weight, the weather resistance of the formed coating will be significantly reduced.

In addition, the fillers used in the present invention include extender pigments such as calcium carbonate, barium sulfate, magnesium carbonate,
Examples include inorganic particulate materials such as talc and clay, and examples of the aggregate include borax. This filler is blended to improve brittleness and increase weight, and to float the resin component to the surface of the coating film due to the difference in specific gravity while the composition still maintains fluidity after coating. , particle size with large specific gravity 50~
1000μ, preferably 50 to 500μ.

The filler is blended in the above mixture (2) in a proportion of 25 to 70% by weight. This is because within this range, a coating film free of cracks and cracks can be obtained even in thick coating films.

Further, examples of the cement used in the present invention include siltland cement, blast furnace cement, silica cement, alumina cement, etc., but the type thereof is not particularly limited. In the present invention, cement is the above mixture (&)
It is blended in a proportion of 20 to 60% by weight. If the cement content is less than 20% by weight, cracks and cracks will easily occur when the film is thick, and adhesion will decrease. On the other hand, if it exceeds 60% by weight, the coating film becomes brittle and efflorescence is likely to occur.

Further, the colored pigment used in the present invention is typically a general inorganic pigment, but depending on the color, an organic pigment having alkali resistance and weather resistance may also be used. For example, when coloring black, car, IF black, iron oxide, etc., for red, Bengara, etc., for green, chromium oxide, etc., for blue, cyanine blue, etc., for white, etc. Examples include titanium dioxide. The coloring pigment is blended in the above mixture (2) in an amount of 1 to 5% by weight, and by blending within this range, sufficient coloring can be achieved.

Further, as the curing agent for epoxy resin used in the present invention, polyamide resins obtained by polycondensation of diamines or diamine derivatives, etc. and dibasic acids or dibasic acid derivatives, ethylene dihumine% ethylene triamine, triethylene tetramine decorated or aliphatic polyvalent amines modified with phenol resins, epoxy resins, etc. are suitable. It is necessary to use the curing agent in an amount of 0.8 to 1.2 equivalents based on the epoxy group of the epoxy resin. If the amount is less than 0.8 equivalents or more than 1.2 equivalents, the original properties of the epoxy resin, such as adhesion and flexibility, will be significantly reduced, and other performances such as durability will also be deteriorated, which is not preferable.

Additives used in the present invention include, for example, dispersants, antifoaming agents, thickeners, preservatives, antifungal agents, etc. to improve pigment dispersibility, painting workability, storage stability, etc. Examples include film-forming aids for improving the film-forming properties of the coating film.

Furthermore, (1) acrylic emulsion in the above mixture (&).

The weight ratio of the sum of the solid content of the epoxy emulsion resin and the solid content of the epoxy emulsion resin (11) and the 4'J) cement is [00(ii))/4φ=Q, 15 to 0.28.

If this ratio is smaller than 0.15, efflorescence will occur due to the initial hardness of the coating film, making it impossible to form a thick film with good coating performance.
．． If it is larger than 28, cracks and cracks are likely to occur when the film is thick.

Also, the weight ratio of [(11)+0-]/[(i)+(11)10] is preferably 2 to 0.45, and if this ratio is less than 0.2, the adhesion will be poor. On the other hand, if this ratio is greater than 0.45, the weather resistance decreases.

The aqueous coating composition used in the method of the present invention is prepared by blending 15 to 70 parts by weight of water to 100 parts by weight of the mixture (a) to give a composition viscosity of 50 to 1000.16 viscosity. This is because within this range, cement hardening and painting workability are good.

If the amount of water is less than 15 parts by weight, the acrylic emulsion will tend to coagulate when mixed with cement, while if it exceeds 70 parts by weight, the solid content will decrease and it will become loose during drying, causing cracks and cracks.

On the other hand, for the paint finish of the present invention, commonly commercially available synthetic resin topcoats used in the method can be used, but in relation to the basecoat film, it is necessary to It is possible to use paints selected from solvent-based acrylic-urethane resin enamel paints, solvent-based acrylic resin enamel paints, solvent-based vinyl chloride resin enamel paints, or glossy acrylic emulsion resin paints, which have excellent properties such as: Particularly preferred.

In another aspect of the present invention, an intermediate coat 9 is applied on the undercoat film.
The method includes a method of applying a top coat after applying a paint, but as the intermediate coat, an acrylic-urethane resin surfacer, a vinyl chloride resin sealer, an acrylic emulsion resin sealer, etc. are preferably used. Therefore, the combinations of the intermediate coat and top coat are [acrylic-urethane resin surfacer and acrylic-urethane 7m fat enamel paint], (vinyl chloride resin sealer and vinyl chloride resin enamel paint), (vinyl chloride resin sealer and Particularly preferred are acrylic resin enamel paint) or (acrylic emulsion resin sealer and glossy acrylic resin emulsion resin paint). The intermediate coating and top coating can be produced by mixing each resin with a colored pigment, a two-body pigment, an organic solvent or water, and other necessary additives, if necessary.

In the coating finishing method of the present invention, first, the aqueous undercoat coating composition is applied by a conventional coating method, such as spray coating or roller coating, to a dry film thickness of about 100 to 500 μm, and then dried at room temperature. Then, if necessary, an intermediate coat is similarly applied to a thickness of about 25 to 100 μm and dried, and finally a top coat is similarly applied to a thickness of about 25 to 100 μm and dried.

Thus, according to the method of the present invention, blistering, peeling, etc. of the paint film caused by rainwater entering from the back side or the upper side of the firewall can be prevented for a long period of time, and a paint film layer with excellent adhesion strength is formed. In addition, there is the advantage that undercoating can be applied without worrying about the moisture content or pH1 of the object to be coated (mortar metal trowel surface) (in extreme cases, the surface of the object to be coated may be wet). Another effect is that the process can be shortened.

The present invention will be explained below with reference to Examples. In the examples, parts and weights are based on weight.

First, prior to the Examples, each paint was prepared according to the following formulation.

[Formulation 1] Undercoat paint acrylic emulsion resin (solid content) 7.0 parts Barium sulfate 20.0 Silica sand (particle size 100-200μ) i5. .

Cement 48.0 Titanium oxide 3.5 Additive 1.5 Water 32 The acrylic emulsion resin is methyl methacrylate/
It is copolymerized in the ratio of butyl acrylate/2-ethylhexyl acrylate/styrene = 25/20/2015 (weight ratio), and is an emulsion resin with a minimum film forming temperature of -5°C, and has an average molecular weight of 600 emulsion resin.

[Formulation 2] Undercoat paint acrylic emulsion resin (solid content) 4.2 parts Barium sulfate 40.0 Silica sand (same as formulation 1 3 20.0 Cement 29.0 Titanium oxide 2.0 Hardening agent (same as formulation 1) 1 .5 Additives 1.5 Water 24 The acrylic emulsion resin is copolymerized at a ratio of methyl methacrylate/2-ethylhexyl acrylate = 20/22 (weight ratio), and has a minimum film forming temperature of 4°C. It is an emulsion resin.

[Formulation 3] Intermediate paint vinyl chloride resin (solid content) 20 parts Solvent 80 [Formulation 4] Intermediate paint acrylic emulsion resin (solid content) 25.0 parts Titanium oxide 15.0 Calcium carbonate 20.0 Antifoaming agent 0 .5 Additives 4.0 Water 35.5 The acrylic emulsion resin is acrylic copolymerized in the ratio of butyl acrylate/methyl methacrylate/2-ethylhexyl acrylate/styrene = 90/90/20150 (weight ratio). It is an emulsion resin.

[Formulation 5] Intermediate paint (main ingredient) Bisphenol-type epoxy resin (solid content) 12 parts Titanium oxide 14 Magnesium silicate 24 Additives 2 Solvent 18 (Curing agent) Polyamide resin (solid content) 15 Solvent 15 [Formulation 6] Top coat Paint (main ingredient) Acrylic polyol resin (solid content) 26.0 parts Titanium oxide 24.0 Additives 0.4 Solvent 29.6 (Curing agent) I-lysocyanate 10.0 Solvent 10.0 [Formulation 7] Top coat chloride Vinyl resin (solid content) 23 parts Titanium oxide 22 Barium sulfate 6 Plasticizer 2 Additive 1 Solvent 46 [Formulation 8] Top coat acrylic resin (solid content) 36.0 parts Titanium oxide 22.0 Barium sulfate 8.0 Plasticizer 2.0 Additive 1.5 Solvent 30.5 The acrylic resin has butyl acrylate/methyl methacrylate/2-ethylhexyl acrylate/styrene = 1
It is a resin copolymerized at a ratio of 0/1315/8 (weight ratio).

[Formulation 9] Top coat titanium oxide 25.0 Antifoaming agent 0.5 Additive 4.0 Water 45.5 Examples 1 to 6 and Comparative Examples 1 to 2 First, a concrete block (300 x 300 x 150 cm
] The upper part and one side of the surface were covered with mortar using a metal trowel, and the material was prepared by leaving it outdoors for a week. Then, only the surface of the mortar metal trowel of the above material (excluding the top surface) was coated with the coating system shown in Table 1, and after drying at room temperature for 24 hours, it was left outdoors for a comparative test.

In addition, the moisture content of the material before painting is 10 cm or more, and the pH is 11.
．． It was 5.

Adhesive strength: Use Kenken type tensile testing machine.

Fracture display, qb: Indicates the fracture location and its area during the adhesive strength test.

G is cohesive failure of material (mortar) shows.

GS is the interface between the material and the base coat. Show destruction.

Paint film condition Degree of blistering ◎: Paint film surface (300 x 300 m)
No number of K blisters was observed.

○: 1 to 3 blisters appear as well Living.

Δ: Similarly, 5 to 20 occurred.

×: Same <21 or more occurrences.

Degree of peeling: ◎: No peeling is observed on the coating film surface (300×300■).

○: Peeling area within 1 yen is recognized.

△: Peeling area of 1 to 5 inches as well is recognized.

×: Peeling area of 6 inches or more as well is recognized.

It is clear from the above comparative test results that the coating layer obtained by the method of the present invention exhibits long-term durability against blistering and peeling due to rainwater entering from unpainted parts of the material, but compared to conventionally known coatings. The coating obtained from the above coating system causes significant blistering and peeling in the afternoon.

Furthermore, the coating layer obtained by the method of the present invention has a greater adhesion strength after one day than the initial adhesion strength, maintains this strength even after two years, and has excellent adhesion between the base coat and the material. It was something like that.

(The fracture location was always a cohesive failure of the material.)

[Brief explanation of drawings]

Figure 1 shows some of the fire walls of fueling facilities, etc. 1: Concrete lJ゛-) block, 2: Mortar Kasagi part, 3: Mortar metal trowel surface on inner surface of concrete block firewall, 4: Paint coating film. Procedural Amendments Showaguchi 58 Sui lO Month 5 Director General of the Patent Office Kazuo Wakasugi Tono Showa, Patent H1l+2 filed on September 30, 1958 Title of Invention Method 3 of Painting and Finishing Firewalls of Refueling Facilities etc. Relationship with the case involving a person who does

Claims (9)

[Claims] (1) Core Creation) In a finishing method for fire walls such as refueling facilities where the inner surface of a 7" rock wall is finished with cement mortar and then painted, first 1 (a) (+) acrylic emulsion resin is applied on the cement mortar layer. Solid content 2~
15" L (11) Epoxy emulsion resin solid content 1-5% by weight, OiD filler 25-701t'j
, (ψ Cement 20-60% by weight, 0 Colored pigment 1-5U, 6/It Required amount of curing agent and other additives for the above-mentioned process d?xy emulsion resin Furanari, Nine [(i) + (II) )]/(ψ=0.15~0.28
(wt ratio) and (b) 15 to 70 parts by weight of water, and then a synthetic resin paint is applied as a topcoat, resulting in an f:% refueling facility, etc. How to finish painting fire walls. (2) The acrylic emulsion resin in the undercoat composition is a copolymer of acrylic acid or methacrylic acid alkyl ester (the alkyl ester has 1 to 8 carbon atoms), or a combination of the acrylic acid or methacrylic acid alkyl ester and styrene. (Styrene content is 30% by weight or less) Copolymer (styrene content: 30% by weight or less) The method of painting and finishing fire walls of fuel supply facilities, etc., according to claim (1). (3) The method for painting and finishing fire walls of refueling facilities, etc., according to claim (1), wherein the minimum film forming temperature of the acrylic emulsion resin is 5° C. or lower. (4) Said ((ii) + 6Jil) / [:
(i) + (ii) weight ratio of 0.2 to 0
．． 45. A method for painting and finishing a fire wall of a refueling facility, etc., as set forth in claim (1), which is within the scope of claim 45. (5) The synthetic resin top coat is a paint selected from acrylic-urethane resin enamel paint, acrylic resin enamel paint, vinyl dichloride resin enamel paint, or glossy acrylic emulsion resin paint.
1) Method of painting and finishing fire walls of refueling facilities, etc. as described in section 1). (6) In a method for finishing a fire wall in a refueling facility, etc., in which the inner surface of a concrete block wall is finished with cement mortar and then finished with painting, first, on the cement mortar layer, (-)(i) acrylic emulsion resin solid content 2 to
15 weight ratio, (11) Epoxy emulsion resin solid content 1 to 5 weight conversion (Iij) Filler 25 to 70 weight to 4ψ Cement 20 to 60 weight ratio, (V) Color pigment 1 to 5 weight ratio 6Jll The above epoxy emulsion The required amount of curing agent and other additives for the resin is fJi, and C(i)+(ii))/4V)=0.15~
100 parts by weight of a mixture in the range of 0.28 (weight ratio); and (b) 15 to 70 parts by weight of water as an undercoat, and then a synthetic resin intermediate coat is applied, followed by a top coat. A method for painting and finishing fire walls of refueling facilities, etc., characterized by: (7) The acrylic emulsion resin in the undercoat composition is an acrylic acid or methacrylic acid alkyl ester copolymer (the alkyl ester has 1 to B carbon atoms), or a copolymer of the acrylic acid or methacrylic acid alkyl ester and styrene. A method for painting and finishing fire walls of fuel supply facilities, etc., as set forth in claim (6), which is a polymer (styrene content is 30% or less). (8) The method for painting and finishing fire walls of refueling facilities, etc., according to claim (6), wherein the minimum film forming temperature of the acrylic emulsion resin is 5° C. or lower. (9) Said ((ii) + ω) / [core (11) 100]
The method for painting and finishing fire walls of refueling facilities, etc., according to claim (6), wherein the weight ratio of is in the range of 0.2 to 0.45. α1 The combinations of the intermediate coat and top coat are (acrylic-urethane resin surfacer and acrylic urethane resin enamel paint), (vinyl chloride resin sealer and vinyl chloride resin enamel paint). (vinyl chloride resin sealer and acrylic resin enamel paint) or (acrylic emulsion) (acrylic emulsion resin sealer and glossy acrylic emulsion resin paint).