JPH10258472A - Statically bristle-set steel plate and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesion with a base plate and, besides, form a bristle- set coat layer having high pliability by directly providing a bristle-set layer consisting of a paint composition of a predetermined component composition on a base plate such as a steel plate, and statically setting organic short fiber on the layer. SOLUTION: For a paint composition forming a static bristle-set layer 2, there is used one-liquid type matter consisting of a pH adjuster such as water epoxy modified polyurethane resin, aqueous acid black dye, an antifoamer and ammonia. The bristle-set layer 2 consisting of such a paint composition has an excellent adhesive strength with the base plate of a surface-treated steel plate 1 or the like and also has a high pliability, and when molding the bristle-set base plate, the layer 2 has no breakage, cracks, or separation. It has also a superior bristle-set adhesiveness in which bristle-set organic short fiber 3 never falling off during the work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a substrate using a surface-treated steel sheet or the like as a substrate without providing a preliminary coating layer (primer) made of a synthetic resin or the like containing a rust preventive pigment on the substrate. The present invention relates to a flocked steel sheet having a flocked planting layer directly provided thereon, and an electrostatic flocking layer of organic short fibers provided on the planted layer, and a method for producing the same.

[0002] The flocking planting layer of the present invention has excellent adhesive strength to a substrate such as a surface-treated steel sheet and has high flexibility.
Forming of the planted substrate (pressing, forming, etc.)
In doing so, the planting layer is not broken, cracked or detached.

[0003] The electrostatic flocking steel sheet of the present invention uses a commercially available surface-treated steel sheet such as a chromic acid-treated galvanized steel sheet as a substrate, and performs electrostatic flocking thereon.
It can be used as a material for building materials such as condensation prevention ducts and condensation prevention panels, kitchen equipment, electrical equipment, office equipment, automotive parts, toys, containers and casings.

[0004]

2. Description of the Related Art As prior art relating to the present invention, the surface of a steel sheet is degreased and then subjected to a chromic acid chemical conversion treatment to increase the adhesion between the steel sheet and the polyester synthetic resin layer. A synthetic acrylic resin layer containing a rust-preventive pigment, and a reactive acrylic adhesive layer having flexibility so that breakage, cracking or detachment does not occur during drawing or bending on a part or the entire surface of the resin layer. There is known a flocked steel sheet for forming, which is formed by electrostatically flocking a synthetic resin pile on the adhesive layer (for example, Japanese Patent Publication No. Sho 62-27864).

[0005] After the surface of an H-shaped steel, a steel pipe, a sheet pile or a steel sheet used as a civil engineering or building steel material is subjected to rust removal using a shot blast, grinder, belt sander or the like, an acrylic urethane-based adhesive is applied. A flocked steel material in which a non-metallic fiber is planted in an uncured state and a method for producing the same are known (for example, see Japanese Unexamined Patent Application Publication No.
138,813).

A conversion coating is formed by treating the front and back surfaces of aluminum or an alloy thereof with chloric acid or chromium phosphate, and an adhesive made of an acrylonitrile-butadiene copolymer rubber emulsion is applied to the coating, and a nylon pile or the like is applied thereto. It is known that the fibers are planted.
-34778 gazette).

[0007] As a prior art relating to an electrostatic flocking adhesive for a weatherstrip member used for the upper and lower opening / closing portions of a window glass of an automobile, the component composition is 100% by weight of an ethylene-vinyl acetate copolymer and is non-yellowing type. 1-30 parts by weight of a urethane prepolymer (this polymer is a non-yellowing polyisocyanate resin and is used as a curing agent for an ethylene-vinyl acetate copolymer), and 0.1-5 parts by weight of a glycidyl silane coupling agent , Wetting agent 0.01-
A compound containing 5 parts by weight is known (JP-A-6-14).
No. 5635).

[0008]

The present invention uses a commercially available surface-treated steel sheet such as a chromic acid-treated galvanized steel sheet as a substrate, and applies a rust preventive pigment or the like in the prior art to the surface of the substrate. Without providing a preliminary intermediate layer (primer) such as a containing polyester synthetic resin layer,
A flocked steel sheet formed by providing only a flocked planting layer having excellent adhesion to a substrate such as a steel plate made of a composition having a special component composition, and electro-stapling organic short fibers on the planted layer. Is provided.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a flocking planting layer comprising a coating composition having a special component composition is provided directly on a substrate such as a steel plate. And a method of manufacturing the same.

As the coating composition constituting the flocking layer according to the present invention, a one-pack type composition comprising an aqueous epoxy-modified polyurethane resin, an aqueous acidic black dye, an antifoaming agent and a pH adjuster such as ammonia is used. Alternatively, a two-pack type of an aqueous polyester polyurethane resin, an aqueous acidic black dye, a defoaming agent and a pH adjuster such as dimethylethanolamine to which a curing agent is added upon use is used.

The flocked planting layer made of the coating composition of the present invention has excellent adhesive strength to a substrate such as a steel plate and has high flexibility, so that the flocked substrate is formed (pressed, formed, etc.). At this time, the planting layer does not break, crack or detach. It also has excellent flock adhesion, which prevents the planted organic short fibers from falling off during processing.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The surface-treated steel sheet used in the present invention includes a hot-dip galvanized steel sheet, an alloy-based hot-dip coated steel sheet, an electro-galvanized steel sheet, an electro-alloyed steel sheet, a pre-coated steel sheet, and the like. In addition, as the organic short fibers electrostatically planted in the flocking planting layer, there are used synthetic fibers such as regenerated fibers, semi-synthetic fibers, and synthetic fibers, and natural fibers such as plant fibers and animal fibers.

The one-pack type coating composition of the present invention comprises an aqueous epoxy-modified polyurethane resin [trade name: VIAN (VIAN)]
OVA, Germany)], aqueous acidic black dye (Oriental Chemical), defoamer [Adecanate (trade name; Asahi Denka)], and a pH regulator, which contain a compound having a double bond. Therefore, the reaction mode in forming the coating layer is an oxidation polymerization type, and the coating layer is oxidized and polymerized and cured by the action of oxygen in the air.

The two-pack type coating composition of the present invention comprises an aqueous polyester polyurethane resin [trade name: Daotan (VIAN)
OVA, Germany), an aqueous acidic black dye (manufactured by Orient Chemical), a defoaming agent (product name: ADECANATE (manufactured by Asahi Denka)) and a pH adjuster, and a non-yellowing polyisocyanate resin (product name) as a curing agent Death module, manufactured by Sumitomo Bayer) is used. Since this contains a compound having a hydroxyl group as a functional group, when the coating layer is formed, the hydroxyl group reacts with the isocyanate group having high reactivity of the curing agent to crosslink, thereby forming the coating layer. Cures. The pH of both coating compositions is 7.0-8.
0.

Specifically, the component composition of the one-pack type coating composition is such that an aqueous acidic black dye solution 3.0-5.
0 parts by weight, 0.5-2.0 parts by weight of an antifoaming agent and 0.5-1.0 parts by weight of a pH adjuster. When these are blended, the mixture is stirred in a mixer at a rotation speed of 2,000 to 3,000 rpm for 5 to 10 minutes, and finally, the pH value is adjusted to 7.0.
Adjust to -8.0. Immediately after production, bubbles are generated,
Used after a lapse of 2-3 hours after production.

Further, the component composition of the two-pack type coating composition is such that 3.0 to 5.0 parts by weight of an aqueous acidic black dye solution is added to 100 parts by weight of an aqueous polyester polyurethane resin.
0.5-2.0 parts by weight of defoamer and 0.5-pH adjuster
Consists of 1.0 part by weight. When these are compounded, they are mixed in a mixer at a rotation speed of 2,000-3,000 rpm for 5 minutes.
Stir for -10 minutes and finally adjust the pH to 7.0-8.0.
Adjust to Immediately after production, bubbles are generated.
Use after 3 hours. When this coating composition is actually used, it is used by mixing with a curing agent comprising a non-yellowing polyisocyanate resin. The mixing ratio is the ratio of the curing agent 1 to the two-pack type coating composition 5 by weight.

In the present invention, an aqueous resin comprising an aqueous epoxy-modified polyurethane resin or an aqueous polyester polyurethane resin is used. In this aqueous resin,
(A) a hydrophilic organic resin which is soluble in water and is soluble in water; (b) a particle size of 0.01-
(C) a dispersion type capable of suspending 0.1 μm particles of an organic resin and stabilizing the particles in water by ionizing the particles themselves or by adding an emulsifier; and It has the same form as the dispersion type, but there is an emulsion type having an organic resin particle diameter of 0.1 μm or more. Among these, the aqueous resin of the present invention corresponds to the dispersion type, and the emulsified form thereof is an anionic self-emulsifying organic resin, and the resin particles have a hydrophilic property comprising an ionic functional group in the self. Since it has a group,
The resin itself can float in water, and the physical properties of the coating film are excellent because the resin particles emulsified and suspended in water form a coating film after curing and drying. A coating film having a strong

The coating composition of the present invention has the advantage that it is water-soluble and does not require the use of highly polluting organic solvents when used. A flexible coating layer can be formed by coating with a roll coater or spray coating, and a thickness of the coating layer of about 30 to 40 µ is sufficient. Hereinafter, the present invention will be described based on examples.

[0019]

Example 1 To 100 parts by weight of an aqueous epoxy-modified polyurethane resin was added 4.0 parts by weight of an aqueous acid black dye,
1.5 parts by weight of an antifoaming agent and 0.6 parts by weight of an ammonia pH adjuster were mixed and mixed to obtain a one-pack type flocking adhesive aqueous coating composition. The viscosity of the obtained coating composition is 25-30.
(Sec / FC♯4).

The coating composition is sprayed onto a commercially available chromic acid-treated galvanized steel sheet at a spray pressure of 3-4 kg / cm ² from a spray gun having a diameter of 1.3-1.5 mm, and a surface of 35 μm is sprayed on the surface. A coating layer was formed. While the surface of the coating layer maintained the adhesiveness, organic short fibers made of nylon 66 were implanted in the coating layer using an electrostatic flocking device (manufactured by Mesac Co., Ltd.). Then, in the dryer at a temperature of 80-
Forced drying was performed at 120 ° C. for 10 to 15 minutes to obtain a flocked steel sheet product.

The obtained flocking steel sheet product is JIS-K-54
The results of an endurance test based on 00 (paint standard test standard) are as shown in Table 1.

[0022]

[Table 1]

Bending resistance: A test in which an electrostatic flocking steel sheet is pressed against an iron rod having a diameter of 2 mm to bend and inspect the peeling state of the adhesive flocking layer.

Adhesiveness / cross-cut method: A test in which a cut-shaped cut is made in the adhesive flocking layer of the electrostatic flocking steel sheet, and an adhesive tape is pressed against the cut to check the peeling state.

Impact resistance / Depton type: A test in which a steel ball having a weight of 500 g and a radius of 1/2 inch is dropped from a height of 50 cm onto an electrostatic flocking steel plate to check the peeling state of the adhesive flocking layer.

Exelin value / break distance method: diameter 20 ±
Test for inspecting the peeling state of the adhesive flocking layer by extruding a 0.05 mm steel ball from the back surface of the electrostatic flocking steel plate.

Moisture resistance / fixed type: A test in which the device is left at 40 ° C. and 95% humidity for 240 hours.

[0028]

Example 2 100 parts by weight of an aqueous polyester polyurethane resin, 4.0 parts by weight of an aqueous acidic black dye,
5 parts by weight of an antifoaming agent and 0.6 parts by weight of a dimethylethanolamine pH adjuster were mixed and mixed to obtain a two-pack type flocking adhesive aqueous coating composition.

A non-yellowing type polyisocyanate resin was used as the curing agent, and the coating composition and the curing agent were mixed at a weight ratio of 5: 1. The viscosity of the coating composition to which the curing agent was added was 25-30 (sec / FC♯4). The paint was sprayed onto a commercially available chromic acid-treated galvanized steel sheet from a spray gun with a diameter of 1.3 to 1.5 mm using a spray pressure of 3-
It was sprayed at 4 kg / cm ² to form a 35 μm coating layer on the surface. While the coating surface retains adhesiveness,
Organic short fibers made of nylon 66 were planted in the coating layer using an electrostatic flocking device (manufactured by Mesac Co., Ltd.). Then, it was forcibly dried at a temperature of 80 to 120 ° C. for 10 to 15 minutes in a dryer to obtain a flocked steel sheet product.

The obtained flocking steel sheet product was subjected to JIS-K-54
The results of an endurance test based on 00 (paint standard test standard) are as shown in Table 1.

[0031]

According to the present invention, a special coating composition is applied to form a flocked planting coating layer having excellent adhesion to the substrate and high flexibility on a substrate such as a steel plate. Therefore, when the obtained flocking steel sheet product is subjected to forming processing such as drawing and bending, the coating layer is not broken, cracked, peeled off, etc. There is an effect that it does not fall off during the forming process.

[0032] The flocked steel sheet product obtained by flocking using the coating composition of the present invention is not only excellent in workability, but also excellent in dew condensation prevention property, incombustibility and corrosion resistance.
Flocked steel sheet products of the present invention, building materials such as condensation prevention ducts and condensation prevention panels, kitchen equipment, electrical equipment, office equipment,
It can be used as a material for automobile parts, toys, containers, casings and the like.

Further, in the conventional production of the electrostatic flocking steel sheet, the plate-like steel sheet is subjected to the electrostatic flocking processing. However, in the production of the electrostatic flocking steel sheet of the present invention, the coil-like steel sheet is coiled. After unwinding the surface-treated steel sheet wound, and then stretching and continuously performing the electrostatic flocking process, it can be rewound again, so it is slit into a narrow band shape, and a new spiral tube etc. This has a remarkable effect peculiar to the present invention that it can be supplied as a material of a roll-formed product.

[Brief description of the drawings]

FIG. 1 is a view showing a cut surface of a flocked steel sheet product of the present invention.

[Explanation of symbols]

1: Surface treated steel sheet 2: Electrostatic flocking planted layer 3: Organic short fiber

Claims (6)

[Claims] 1. A flocking planting layer formed from a flocking adhesive aqueous coating composition comprising a water-based epoxy-modified polyurethane resin, a water-based acidic black dye, an antifoaming agent and a pH adjuster is provided on the surface of a surface-treated steel sheet; An electrostatic flocking steel sheet in which an electrostatic flocking layer made of organic short fibers is formed on the planting layer. 2. A flocked adhesive aqueous coating composition comprising an aqueous epoxy-modified polyurethane resin, an aqueous acidic black dye, an antifoaming agent and a pH adjuster is applied to the surface of a surface-treated steel sheet by roll coating or spray coating. A flocking planted layer with excellent adhesion to the steel sheet is formed on the surface, and the organic flocking steel plate is manufactured by electrostatically flocking organic short fibers while the surface of the planting layer maintains adhesiveness. how to. 3. The method according to claim 2, wherein the surface-treated steel sheet wound in a coil shape is unwound, stretched, subjected to a continuous flocking process, and then unwound again. 4. A flocking adhesive water-based coating composition comprising a water-based polyester polyurethane resin, a water-based acidic black dye, an antifoaming agent and a pH adjuster on the surface of a surface-treated steel sheet and adding a non-yellowing polyisocyanate resin as a curing agent. An electro-transplanted steel sheet provided with a flocking implanted layer formed from a material, and an electrostatic flocking layer made of organic short fibers formed on the implanted layer. 5. A flocking adhesive water-based paint composition comprising a water-based polyester polyurethane resin, a water-based acidic black dye, an antifoaming agent and a pH adjuster on the surface of a surface-treated steel sheet, and a non-yellowing type polyisocyanate resin added as a curing agent. To
Apply by roll coating or spray coating to form a flocking planted layer with excellent adhesion to the steel plate on the surface of the steel plate, and remove the organic short fibers while the surface of the planted layer maintains the adhesiveness. A method for producing an electrostatic flocking steel sheet by electro-flouring. 6. The method for producing an electrostatic flocking steel sheet according to claim 5, wherein the surface-treated steel sheet wound in a coil shape is unwound, stretched, continuously subjected to a flocking planting process, and then unwound again.