KR101107101B1 - Water-based coating material - Google Patents

Abstract

There is provided an aqueous coating which can be baked at a relatively constant temperature and which can suppress the generation of bubbles even when coated on a coating film having irregularities on its surface or a coating film having hollow holes therein. The said subject was solved by adding the acetylene diol type surfactant whose HLB value is less than 8 to the water-based coating composition containing polyether sulfone type resin.

Description

Water-based paints {WATER-BASED COATING MATERIAL}

The present invention relates to an article having an aqueous coating and a coating formed of the coating, and more particularly, to an aqueous coating composition containing a polyether sulfone resin, by adding an acetylene diol surfactant having an HLB value of less than 8 It relates to an article having an aqueous coating and a coating formed of the coating.

Since fluorine resin is excellent in heat resistance, non-adhesiveness, and pollution resistance, it is widely used for cooking appliances, such as a frying pan, a microwave oven inner plate, an inner pot of an IH thermal insulation combined use rice cooker, and a gas table top plate.

When fluorine resin is coated on a metal substrate such as aluminum constituting the cooking utensil, a primer is coated on the metal substrate, a top coating layer made of fluorine resin is further coated thereon, and then the coating film is baked. The method of forming the coating film which consists of layers is known.

In addition, in order to form a protective layer or a heat insulating layer against external impact, a fluororesin coating is further performed on the back surface of the surface to which the fluororesin coating is applied.

Moreover, in order to provide heat insulation to a coating film, it is also known to add porous fine particles which consist of inorganic materials, such as glass beads, to a coating material.

When fluorine resin coating is also applied to the back surface of the metal substrate to which the fluorine resin coating is applied to the surface, there is a problem that the fluorine resin coating on the previously formed surface is melted during the fluorine resin coating baking on the back surface.

Moreover, when a coating film is formed from the coating material containing porous microparticles | fine-particles, a coating film with an unevenness | corrugation on the surface, or a coating film with an empty hole inside may be formed due to porous microparticles | fine-particles.

In order to eliminate such unevenness | corrugation of the surface of a coating film, and an empty hole in a coating film, when coating the aqueous coating material containing polyether sulfone type resin on this coating film, there existed a problem that air bubbles generate | occur | produce in a coating film in the drying process of the coating film.

MEANS TO SOLVE THE PROBLEM As a result of earnestly researching in order to solve the above problems, the present inventors can solve these problems by adding the acetylenediol type surfactant whose HLB value is less than 8 to the waterborne coating composition containing polyether sulfone type resin. The present invention was completed, and the present invention was completed.

That is, when the coating film made of the water-based paint according to the present invention is applied to the back side of the surface to which the fluororesin coating is applied, the water-based paint of the present invention can be baked at a relatively low temperature, so that the fluorine resin coating applied to the surface side is melted. There is an effect that can be avoided.

In addition, since the water-based paint of the present invention has pseudoplastic (thixotropic), it is possible to prevent the generation of bubbles during the paint drying process, and to obtain the effect that the surface of the article is finished beautifully and smoothly.

1 is a graph showing the similarity of each aqueous paint obtained in Examples 1 to 4 and Comparative Examples 1 to 7. FIG.

In this way, according to the present invention, by adding an acetylenediol-based surfactant having an HLB value of less than 8 to an aqueous coating composition containing a polyether sulfone resin (PES), baking can be performed at a relatively low temperature. Eggplant is provided with an aqueous paint.

Moreover, according to this invention, the article which has a coating film formed from this water-based paint is provided.

Hereinafter, the present invention will be described in more detail.

In the present invention, "polyether sulfone resin" means a thermoplastic polymer having a structure in which a paraphenylene group is alternately bonded with a sulfone group and an ether group, and a polymer having a glass transition temperature of 220 to 230 ° C is particularly preferred.

Specifically, a polyether sulfone resin on a powder is preferable, and Sumica Excel (trademark) 410OMP, 5200P, 7600P, 5003P (manufactured by Sumitomo Chemical Co., Ltd.) and Ultrason (trademark) E2020P, E6020P (BASF Corporation) Products) are more preferred, and Sumica Excel ™ 410OMP is particularly preferred among these.

The polyethersulfone resins listed as preferred examples above have properties such as heat resistance, creep resistance, dimensional stability, flame retardancy, and hot water resistance, and the elastic modulus is stable in a temperature range of -100 ° C to 200 ° C. .

In the present invention, an "acetylenediol-based surfactant" is a surfactant having a bilaterally symmetric nonionic molecule having a structure in which a hydrophilic group consisting of a hydroxy group and a carbon-carbon triple bond is inserted between hydrophobic groups of branched hydrocarbons. Preferably, it is Supinol (trademark) 420, 104, SE-F, Dynol (trademark) 604 (made by Air Products Japan), These acetylene diol type surfactant uses 2 or more types together can do.

It is preferable that the HLB value of an acetylene diol type surfactant is less than 8, 2-7 are more preferable, and 3-6 are especially preferable. If the HLB value of the acetylenediol-based surfactant is 8 or more, there is a problem that the pseudoplasticity is hard to be expressed.

In the present invention, the "water-based paint" containing the polyethersulfone resin and the acetylenediol-based surfactant as described above is a paint substantially free of an organic solvent, the content of the volatile organic compound is 1% or less, aromatic Refers to an environmentally friendly water-based paint having a hydrocarbon solvent content of less than 0.1%.

The composition for water-based coatings in the present invention contains 90 to 150 parts by weight, preferably 100 to 120 parts by weight of a polyethersulfone resin, based on 100 parts by weight of water, and the water-based coating in the present invention is such an aqueous system. 0.5 to 8 parts by weight, preferably 0.5 to 3 parts by weight of an acetylenediol surfactant, is included with respect to 100 parts by weight of the coating composition.

Various pigments or dyes for coloring can be mix | blended with the water-based paint of this invention arbitrarily. The kind and compounding ratio of such a pigment and dye are not specifically limited, A well-known prescription and compounding method can be employ | adopted as it is.

The water-based paint of the present invention is prepared by first mixing water, a polyethersulfone-based resin, a pigment and / or a dye at room temperature with stirring, to prepare a water-based coating composition, and to obtain an acetylenediol-based composition in the water-based coating composition thus obtained. It can be prepared by adding the surfactant at room temperature with stirring. And an acetylene diol type surfactant can be added to the composition for aqueous coatings just before use of an aqueous coating.

The water-based paint of the present invention is preferably stirred in order to impart proper thixotropic properties, and the pressure during stirring is usually 0.5 to 2 MPa, preferably 0.7 to 1.5 MPa, particularly preferably 0.8 to 1.2 MPa. to be.

The water-based paint of the present invention is prepared based on, for example, aluminum, stainless steel, titanium, iron, or a combination thereof, for example, a cooker such as a cooker including a rice cooker, a pot including a pot, a frying pan, and a frying pan. It is suitably used for cooking utensils, especially cooking utensils for IH.

Although the thickness of the coating film formed by apply | coating the water-based paint of this invention is arbitrary, when forming the coating film which consists of the water-based paint of this invention on the coating film with an unevenness | corrugation on the surface, or the coating film with an empty hole inside, It is preferable to make thickness about 80 micrometers or more.

Moreover, although the water-based paint of this invention can be directly apply | coated to the surface of the article to be coated, the water-based water system of this invention is formed on the upper surface of the coating film layer (A) formed with the composition for water-based coatings which comprise the water-based paint of this invention. It can be set as the composite coating film layer formed by coating a coating material and forming a coating film layer (B).

Moreover, after forming the said coating film layer A in double and triple, the coating film layer B may be formed, or the said composite coating film layer may be formed in double and triple.

[ Example ]

Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples.

Example 1

To 100 parts by weight of water, 103 parts by weight of polyethersulfone-based resin and Sumica Excel (trademark) 4100 MP (glass transition temperature: 230 ° C.), 4 parts by weight of black pigment containing carbon black, and mica coated with iron oxide The composition for water-based paints was prepared using paint SL-831TC (trademark, manufactured by Mitsui Dupont Chemical Co., Ltd.) containing 5 parts by weight of black pigment. 1 part by weight of Surfynol (Surfynol (trademark) 420 (HLB value = 4)) was added as an acetylenediol-based surfactant based on 100 parts by weight of the waterborne coating composition, followed by stirring with a stirrer (TAMAT0 SCIENTIFIC CO. LTD., Product). (80 rpm, 5 minutes) to prepare an aqueous paint.

Example 2

Aqueous paint was prepared in the same manner as in Example 1, using Surfinol 104 (HLB value = 4) instead of Surfinol 420 as the acetylenediol-based surfactant.

Example 3

An aqueous coating was prepared in the same manner as in Example 1, using Dinol 604 (HLB value = 4) instead of Surfinol 420 as the acetylenediol-based surfactant.

Example 4

Surfinol® SE-F (HLB value = 6) was used instead of Surfinol® 420 as the acetylenediol-based surfactant, and an aqueous coating was prepared in the same manner as in Example 1.

Example 5

100 parts by weight of polyethersulfone resin, Sumica Excel (trademark) 410OMP (glass transition temperature: 230 ° C.), 4 parts by weight of black pigment containing carbon black and mica coated by iron oxide A water-based paint composition was prepared using paint SL-831TC (trademark, manufactured by Mitsui Dupont Chemical Co., Ltd.) containing 5 parts by weight of black pigment.

As an acetylenediol-based surfactant, 100 parts by weight of this aqueous coating composition was added 0.5 parts by weight of Surfinol 420 (HLB value = 4), followed by stirring with a stirrer (TAMAT0 SCIENTIFIC C0. LTD, manufactured) (80 rpm, 5 minutes) to prepare an aqueous paint.

Example 6

As the acetylenediol-based surfactant, 2 parts by weight of Surfinol 420 (HLB value = 4) was added instead of Surfinol 420 (0.5 parts by weight) to prepare an aqueous coating in the same manner as in Example 5.

Example 7

As the acetylenediol-based surfactant, 0.5 parts by weight of Surfinol® 420 (HLB value = 4) and Supinol (trademark) 104 (HLB value = 4) were mixed instead of Surfinol® 420 (0.5 parts by weight). (Total 1 part by weight) was added, and an aqueous paint was prepared in the same manner as in Example 5.

Example 8

To 100 parts by weight of water, 120 parts by weight of polyethersulfone-based resin, Sumica Excel (trademark) 410OMP (glass transition temperature: 230 ° C.), 4 parts by weight of black pigment containing carbon black, and mica coated by iron oxide A coating composition SL-831TC (trademark, manufactured by Mitsui Dupont Chemical Co., Ltd.) containing 5 parts by weight of black pigment was used to prepare a water-based coating composition.

To 100 parts by weight of this water-based coating composition, 0.5 parts by weight of Surfinol 420 (HLB value = 4) was added as an acetylenediol-based surfactant, followed by stirring with a stirrer (TAMAT0 SCIENTIFIC CO. LCD, product). 80 rpm, 5 minutes) to prepare an aqueous coating.

Comparative Example 1

Aqueous paint was prepared in the same manner as in Example 1, using Surfinol 440 (HLB value = 8) instead of Surfinol 420 as the acetylenediol-based surfactant.

Comparative example  2

Aqueous paint was prepared in the same manner as in Example 1, using Surfinol® MD20 (HLB value = 16) instead of Surfinol® 420 as the acetylenediol-based surfactant.

Comparative Example 3

Aqueous paint was prepared in the same manner as in Example 1, using Surfinol 485 (HLB value = 17) instead of Surfinol 420 as the acetylenediol-based surfactant.

Comparative Example 4

Dinol® 607 (HLB value = 8) was used as the acetylenediol-based surfactant instead of Surfinol 420, and an aqueous coating was prepared in the same manner as in Example 1.

Comparative example  5

Alkanediol-based surfactant, EnviroGem (trademark) AD01 ((HLB value = 4), Air Products Japan Co., Ltd.) was used instead of Surfinol 420 as the surfactant, and the same as in Example 1 An aqueous paint was prepared by the method.

Comparative example  6

Aqueous paint was prepared in the same manner as in Example 1, using Surfinol 2502 (HLB value = 8) instead of Surfinol 420 as the surfactant.

Comparative example  7

Aqueous 6% aqueous solution (HLB value = 10) was used instead of Surfinol 420 as the surfactant, and an aqueous coating was prepared in the same manner as in Example 1.

Test Example  One

(Similar plasticity)

For each of the water-based paints obtained in Examples 1 to 4 and Comparative Examples 1 to 7, a B-type viscometer (manufactured by Tokyo Corp.) was used, and a rotation speed of 6 rpm, l2 rpm, 30 rpm and No. 3 rotor was used. The viscosity at 60 rpm was measured. The results are shown in FIG.

Test Example 2

(Foam suppression effect)

The surface of the pot whose outermost layer was aluminum was degreased with isopropyl alcohol, the surface was roughened sufficiently with sandblast, and the dust of the surface was removed by air blow.

On this surface, polyether sulfone resin, Sumica Excel (trademark) 410OMP, a mixture of hollow ceramic SL-125 (average particle size: 80 µm, manufactured by Pacific Cement Co., Ltd.), SL-830MC (trademark, Mitsui DuPont Flow) Local Chemical Co., Ltd.) was used to coat the film so as to have a thickness of 400 µm after firing.

Subsequently, each water-based coating material obtained in Examples 1 to 8 and Comparative Examples 1 to 7 was baked on the surface thereof, and then coated to have a film thickness of 80 μm, and the presence or absence of foaming was visually observed. The results are shown in Table 1.

Example  9

A pot-shaped container produced by press molding a ferrite stainless steel with a thickness of 1.0 mm and aluminum having a thickness of 1.0 mm was used as a base material, and the ferrite stainless steel was used as an outer surface. Sandblasting was performed to the aluminum surface of the inner surface of this pot-shaped container, and the surface was roughened sufficiently, and the dust of the surface was removed by air blow. Subsequently, a liquid primer coating containing a fluororesin, an adhesive component, and a pigment was coated so as to have a film thickness of 10 μm after film formation, and dried at 120 ° C. for 20 minutes.

When the primer is finished drying and the temperature of the substrate is sufficiently lowered, the powder coating of the fluororesin containing additives such as pigments and bright materials as a top coating on the inner surface side is coated to have a film thickness of 50 μm after firing. Subsequently, the resultant was calcined at 390 ° C. for 20 minutes to form a film with a fluororesin coating.

The surface was sufficiently roughened by sandblasting the ferritic stainless surface on the outer surface side of the pot-shaped container coated with the fluorine resin, and dust was removed from the surface by an air blow. On the outer surface side, the coating material SL-830MC, in which polyethersulfone-based resin Sumica Excel (trademark) 4100MP was blended with hollow ceramic SL-125, was coated to have a film thickness of 400 µm, dried at 150 ° C for 15 minutes, Subsequently, it baked for 20 minutes at 290 degreeC, and formed into a film.

On this surface, the water-based coating material obtained in Example 1 was coated so that the film thickness after baking was 80 micrometers, and it dried at 150 degreeC for 15 minutes, and then baked at 290 degreeC for 20 minutes, and manufactured the coated pot.

Example 10

A frying pan coated in the same manner as in Example 9 was prepared except that a ferritic stainless steel having a thickness of 2 mn was used as the substrate.

Example  11

A pot was coated in the same manner as in Example 9 except that aluminum having a thickness of 2.5 mm was used as the substrate.

The water-based paint of the present invention is very preferable as a coating material for forming a coating film on a cooking utensil, particularly as a coating material for forming a coating film on an IH cooking utensil.

Claims (9)

An aqueous coating material comprising adding one or two or more acetylene diol-based surfactants having an HLB value of less than 8 to an aqueous coating composition containing a polyether sulfone resin. The method of claim 1, wherein the blending ratio of the polyethersulfone resin with respect to 100 parts by weight of water in the water-based coating composition is 90 to 150 parts by weight, the addition of acetylenediol-based surfactant to 100 parts by weight of this water-based coating composition Water-based paints having a proportion of 0.5 to 8 parts by weight. 1 or 2 or more coating film layers (A) formed with the composition for water-based coating of Claim 1 or 2, and the water-based coating material of Claim 1 or 2 in the upper surface of this coating film layer (A). The composite coating film layer which consists of a coating film layer (B) formed by the following. delete The composite coating film layer according to claim 3, wherein the coating film layer (B) has a film thickness of 80 µm or more. An article having the composite coating layer of claim 3. The article of claim 6, wherein the article is a cooking utensil. 8. The article of claim 7, wherein the cooking utensil is a pot, pot or frying pan. The article of claim 8, wherein the cooking utensil is a cooking utensil for IH.

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