JPH11228874A - Prevention of film forming of coating material for light weight thick membrane formation in inside of container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent film formation without dissolving blowing material particles by adding a saturated hydrocarbon-based solvent having a specific value of specific gravity to a coating material containing the resin blowing material particles having a specific particle diameter and consisting of a water- dispersing resin as a main component of a vehicle. SOLUTION: This method for preventing film-formation of a coating material in a container comprises adding one or more kinds of preferably 5-15C saturated hydrocarbon-based solvents having 0.6-0.9 specific gravity of preferably 0.1-10 pts.wt., to 100 pts.wt. coating material for forming a light weight and thick membrane, containing resin blowing material particles such as blowing polystyrene particles, blowing polyethylene particles, blowing polypropylene particles, blowing polyurethane particles, or the like, having 0.2-8 mm, preferably 0.5-5 mm particle diameters and consisting of a water-dispersing resin [a resin preferably having (-)20-20 deg.C glass transition temperature and (-)10-20 deg.C film forming temperature] as the main component of a vehicle and having 0.6-0.9 specific gravity and 5-100 Pa.s viscosity of the coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing the inner coating of a container when a water-based paint containing resin foam particles for forming a lightweight thick film is stored in the container.

[0002]

2. Description of the Related Art Conventionally, in order to control a temperature change inside a building, it has been widely practiced to arrange a heat insulating member such as a styrene foam or a glass wall on the inner and outer surfaces of a building wall. ing. On the other hand, as a coating material for imparting heat insulation, a material using an inorganic or organic fine foam or a fine hollow foam as an aggregate is known. As a coating material imparting such heat insulating properties, for example, a film forming temperature of 1
A resin composition for forming an elastic film containing a resin emulsion at 0 ° C. or lower, a hydraulic cement, and resin foam particles (JP-A-60-94470) has been proposed.
According to the composition, a thick film having elasticity can be formed. However, since it contains a cement component, it hardens in a few hours. Therefore, it is necessary to store two liquids, and it is necessary to adjust the required amount each time. There is a problem that it takes time. Also,
When an inorganic aggregate was used as the aggregate, the hollow foam was liable to be broken, so that the heat insulating property was likely to be reduced.

[0003] The applicant of the present invention has previously filed an application for a thick-film elastic heat-insulating paint containing water-dispersible resin having specific properties, foamed resin particles, and pigment (Japanese Patent Application No. 8-308).
567). According to the paint, a coating film having excellent heat insulating properties and sound deadening properties can be formed. However, since the water-dispersible resin is used as a vehicle component, there is a possibility that the paint will be covered in the container during storage of the paint.

Conventionally, when an aqueous composition such as an aqueous paint is packed and stored in a container, a water-insoluble organic solvent or an aqueous solution of a water-soluble polymer is added to the aqueous composition to solidify the surface of the coating liquid. A prevention method has been proposed (for example, JP-A-58-71970). However, when a solvent such as toluene, ethyl acetate or methyl ethyl ketone used in this method is used for preventing skinning of the heat insulating paint, foam particles in the paint are dissolved, and the skinning is insufficiently prevented. there were. In addition, even when an aqueous solution of a water-soluble polymer was used, it was mixed into the heat-insulating paint at the time of storage and transportation, and skinning was not prevented.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, it has been found that a saturated hydrocarbon solvent having a specific specific gravity can prevent skin coating of an aqueous paint containing resin foam particles. And found that the present invention was effective.

That is, the present invention contains resin foam particles having a particle size of 0.2 to 8 mm, and has a specific gravity of 0.6 to 0.9 and a viscosity of 5 to 100 containing a water-dispersible resin as a main component of a vehicle.
A specific gravity of 0.6 to 0.
It is an object of the present invention to provide a method for preventing the coating of the coating material for forming a light and thick film from forming on the inner surface of a container, which comprises adding one or more saturated hydrocarbon solvents.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The coating material for forming a light and thick film used in the present invention has a particle diameter of 0.2 to 8 mm, preferably 0.5 to 8 mm.
It is a water-based paint containing resin foam particles having a size of 5 mm and a water-dispersible resin as a main component of the vehicle.

The resin foam particles include, for example, resin foam particles such as expanded polystyrene particles, expanded polyethylene particles, expanded polypropylene particles, and expanded polyurethane particles, and various known surface treatments applied to these resin foam particles. Things can be mentioned. These may be spherical or crushed. When the particle diameter of the resin foam particles exceeds 8 mm, not only hinders the coating operation such as spraying, but also causes coating film defects such as burrows. Since the surface area increases, the paint thickens, which is not preferable.

As the water-dispersible resin, conventionally known resins can be used without any particular limitation. However, from the viewpoint of the durability of the coating film to be obtained, the glass transition temperature is 30 ° C. or lower, preferably −20 ° C.
20 to 20 ° C., the film forming temperature is 25 ° C. or less, preferably −
A resin emulsion obtained by dispersing a resin at 10 to 20 ° C. in water is suitable.

As the resin, for example, an acrylic resin,
Vinyl acetate resin, vinyl chloride resin, styrene / butadiene resin, epoxy resin, alkyd resin, polyester resin, silicon resin, fluorine resin, polyurethane resin, acrylic urethane resin (including two-pack type) And the like, and these can be used alone or in combination of two or more. Particularly, as a resin emulsion, in the case of a non-crosslinked system, a (co) polymer obtained by emulsion polymerization of one or more vinyl monomers selected from alkyl (meth) acrylate, styrene, vinyl acetate, unsaturated acid and the like. Emulsions are preferred, and in the case of a crosslinked system, a crosslinked emulsion containing a carbonyl group-containing acrylic (co) polymer and a hydrazine compound (see, for example,
And the combined use of the emulsion and an aqueous polyurethane resin (for example, JP-A-5-339542).
No.) is most preferable from the viewpoint of drying properties and the like.

When the glass transition temperature of the resin exceeds 30 ° C., the elasticity of the resulting heat-insulating coating film becomes poor, and coating defects such as cracks occur. When the film formation temperature is 25
If the temperature exceeds ℃, coating defects such as cracks are likely to occur.

In the above-mentioned light-weight thick film forming paint, the solid content volume ratio of the water-dispersible resin / resin foam particles is 100 / 50-1.
00/500, preferably 100/100 to 100/4
It is appropriate to contain so as to be 50.

[0013] If necessary, the above-mentioned light-weight thick-film-forming paint may further include a coloring pigment such as titanium oxide, carbon black, phthalocyanine blue, or iron oxide;
Extenders such as mica, silica and calcium carbonate;
Aggregates such as light, volcanic rubble, burned vermiculite, shirasu balloon, glass balloon, silica balloon;
A film forming aid, a thickening anti-sagging agent, an antifoaming agent, a dispersant, a flame retardant, a fibrous substance, and the like can be added.

The coating material for forming a lightweight thick film has a specific gravity of 0.6 to 0.9, preferably 0.7 to 0.8. If the specific gravity of the paint is less than 0.6, the resin foam particles are easily released from the paint, the resin foam particles are exposed from the coating surface during coating, and the coating unevenness is eliminated even if the coating surface is adjusted by a roller. On the other hand, when the ratio exceeds 0.9, the content of the resin foam particles is decreased, and the heat insulating property and the sound deadening property are undesirably reduced.

The above-mentioned light-weight and thick-film-forming paint has a viscosity of 5 to 5.
100 Pa · s, preferably 10 to 50 Pa · s (BH
Mold viscometer, at 20 rpm: 20 ° C.). If the viscosity of the paint is less than 5 Pa · s, the resin foam tends to separate from the paint during storage, and if it exceeds 100 Pa · s, a large amount of a diluent (water) is required for the viscosity of the paint at the time of painting. It is not preferable because remarkable decrease in drying property and film forming property after coating is caused.

In the present invention, the specific gravity of the paint for forming a lightweight thick film is 0.6 to 0.9, preferably 0.6 to 0.8.
One or more saturated hydrocarbon solvents are added to prevent skinning in the container. The specific gravity of the saturated hydrocarbon solvent is 0.
If it exceeds 9, the solvent is likely to be mixed in the above-mentioned coating material for forming a lightweight thick film, and the effect of preventing skinning cannot be obtained. If the specific gravity is less than 0.6, the solvent is not liquid at normal temperature. A solid at room temperature has an effect of preventing skinning, but when mixed into a coating, it is liable to cause a coating defect such as repelling or lumps, which is not preferable.

As the above-mentioned saturated hydrocarbon solvent, those having 5 to 15 carbon atoms are suitable. For example, n-pentane, i
-Pentane, n-hexane, i-hexane, n-heptane, i-heptane, n-octane, i-octane, n-
Decane, n-dodecane and the like.

The method of adding the above-mentioned saturated hydrocarbon solvent to the paint for forming a light and thick film may be added and mixed at the same time as the paint is produced, but preferably the paint is filled in a container such as a can. It is good to inject when doing. Injection into the container
It may be before or after filling with paint.

The amount of the above-mentioned saturated hydrocarbon solvent to be added to the coating material for forming a light and thick film is 0.1 to 100 parts by weight of the coating material.
10 parts by weight, preferably 0.2 to 5 parts by weight, more preferably 0.3 to 3 parts by weight is suitable. When the amount added is 0.
If the amount is less than 1 part by weight, the effect of preventing skinning cannot be sufficiently obtained, while if it exceeds 10 parts by weight, the effect of preventing skinning remains unchanged and is meaningless.

[0020]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples.

Preparation of Lightweight Thick Film Forming Coatings The components shown in Table 1 were blended, and mixed by stirring with a disper to prepare each lightening thick film forming coating. (Note 1) to (Note 11) in Table 1 are as follows.

(Note 1) A-1: Aqueous emulsion of acrylic / styrene copolymer having a glass transition temperature of 9 ° C. and a film-forming temperature of 15 ° C., solid content 55% by weight (Note 2) A-2: Glass transition temperature 20 ℃, film formation temperature 15
Aqueous emulsion of carbonyl group-containing acrylic copolymer at ℃ and cross-linked emulsion containing adipic dihydrazide as cross-linking agent, solid content 55% by weight (Note 3) “Ales Rubber Tex White”: Kansai Paint Co., Ltd., acrylic latex rubber Layer finishing material (Note 4) Expanded polystyrene particles A: manufactured by Mitsubishi Chemical Corporation
Spherical particles having a sphere diameter of 0.5 to 3 mm and a bulk density of 0.04 g / cc (Note 5) Expanded polystyrene particles B: manufactured by Mitsubishi Chemical Corporation
Crushed product having a particle size of 0.2 to 8 mm and a bulk density of 0.04 g / cc (Note 6) Titanium oxide: manufactured by Teica, specific gravity 4.0 (Note 7) Cray: manufactured by Shiraishi Calcium, specific gravity 2.65 ( Note 8) Magnesium sulfate: Ube Industries, fibrous, specific gravity 2.3 (Note 9) Thickener: "ADEKANOL UH-420", Asahi Denka Co., Ltd. (Note 10) Defoamer: "SN DEFO -A-63 ", manufactured by San Nopco (Note 11) Dispersant:" Nopco Space 44C ", manufactured by San Nopco

[0023]

[Table 1]

[0024] Each paint was prepared as in Examples and Comparative Examples above, after adjusting the paint viscosity shown in Table 2 with clean water 18 liters of tin made oil cans - about the (inner surface co coating can) 16 Liter was filled. At the time of filling, the solvents shown in Table 2 were used as anti-skinning agents (* described in the corresponding column), and the addition amounts (parts by weight / 100 parts by weight of coating material) shown in the table and the following addition methods were used. After leaving each canned paint obtained for one month outdoors, the state of paint in each can and the degree of skinning of the paint surface were evaluated visually and by finger using the following criteria. Table 2 shows the results.

(Addition method) A: Add the paint immediately after producing the paint, stir and fill the paint into the can B: Inject the paint into the can before filling the paint into the can C: Fill the paint into the can And then pour into the can

[0026]

According to the present invention, when a paint containing lightweight foamed resin particles is stored in a container, the foamed resin particles are dissolved by adding a saturated hydrocarbon solvent having a specific gravity. The skinning can be effectively prevented without performing.

[0027]

[Table 2]

Claims (3)

[Claims] Claims: 1. A resin containing resin foam particles having a particle diameter of 0.2 to 8 mm, and having a specific gravity of 0.6 to 0.9 and a viscosity of 5 to 100 Pa · s containing a water-dispersible resin as a main component of a vehicle. A method for preventing the coating of a lightweight thick film-forming coating material from forming on the inner surface of a container, comprising adding at least one saturated hydrocarbon solvent having a specific gravity of 0.6 to 0.9 to the light-weight thick film-forming coating material. 2. The method according to claim 1, wherein the saturated hydrocarbon solvent has 5 to 15 carbon atoms.
2. The method according to claim 1, wherein the inner skin tension is prevented. 3. The amount of the saturated hydrocarbon solvent added to the paint 1
The amount is 0.1 to 10 parts by weight per 100 parts by weight.
Or the method of preventing container inner skin tension according to 2.