JP5266493B2 - Aluminum building material having scratch-resistant coating film and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum building material having a thermosetting coating film the damage resistance of which is ensured against scratch friction or dust involving friction. <P>SOLUTION: After electrodeposition coating is applied to an anodically oxidized film 2 using electrodeposition coating prepared by compounding 0.05-0.5 phr of a fluoroplastic powder and 0.05-3.0 phr of a polyolefinic resin with water-soluble electrodeposition coating, the coated anodically oxidized film 2 is baked to form the thermoset coating film 3 on an aluminum building material. The fluoroplastic powder 31 dispersed inclusive of a coating film surface layer and the wax particles 32 of the polyolefinic resin bled to and dispersed in the coating film surface layer act synergistically to lower the coefficient of friction of the coating film. As a result, high-order damage resistance can be ensured. The occurrence of appearance defectiveness or the adhesion failure with a sealing material caused by independently using the fluoroplastic powder can be also prevented. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to aluminum building materials such as joinery, curtain walls, exterior materials, and the like, and more particularly, to an aluminum building material having a scratch-resistant coating film that imparts scratch resistance to the coating film and a method for manufacturing the same.

Water-soluble electrodeposition coating used to form a thermosetting coating film through a coating process for anodized aluminum film and a baking process for thermosetting the coated thermosetting resin coating so as to form this kind of scratch-resistant coating film. As described in the following patent document, the thermosetting coating film may be said to have scratch resistance (scratch resistance, scratch resistance, etc.) by blending fluororesin powder with an anionic acrylic water-soluble electrodeposition paint. In this case, the water-soluble electrodeposition paint is composed of, for example, 1 to 30 phr of fluororesin powder of 10 μm or less to thermosetting resin obtained by adding amino resin to acrylic resin. , whereby the gloss value, pencil hardness, adhesion, to alkali resistance, while securing the acid resistance, for example, using the corrugated board loaded with a load of 10 g / cm ² on the coated surface, 5 cm strike Also it shall be able to ensure a high degree of scratch resistance to the extent that there is no occurrence of scratches by 50 double rubs tests over click.

JP 2001-329209 A

  In general, an aluminum building material is a composite film of an anodized film and a thermosetting film for an aluminum (aluminum alloy) bar material, and a similar composite film or chemical conversion film and a thermosetting coating for a plate material. Corrosion resistance is ensured by providing a composite film of the film, and the thermosetting coating film has a predetermined film thickness that clears the standard for scratches. In some cases, the thermosetting coating film is scratched, and the corrosion resistance is deteriorated by exposing the base or substrate. Scratches are caused by mutual contact with bars and plates, and contact with other objects. For example, an aluminum sash has a movable part in which a sash door is housed in a sash frame. In this case, the guide rails such as projecting rails and groove rails on the sash frame forming the movable part and the sliders such as door wheels and slurries in the sash doors are in direct contact, and the slider rolls or slides. In addition, it is difficult to eliminate the possibility of scratching the guide rail in the movable part. In particular, this type of aluminum sash is installed and used to divide the inside and outside of the building with the guide rails on the outside and exposed to wind and rain, so that the rainwater dries and dust, including fine soil and sand, is collected. If this dust adheres, it is extremely difficult to eliminate the possibility of scratching because the slider's rolling and sliding become dust trapping friction with the guide rail. is there.

  In this regard, as in patent literature, if a fluororesin powder is blended with a water-soluble electrodeposition paint, the powder is compatible with the paint. Dispersed in the film, the powder acts to reduce frictional resistance, thus eliminating the possibility of scratching due to scratching friction and dust entrainment friction as much as possible, and ensuring scratch resistance in aluminum building materials It is recognized as an effective scratch-resistant means.

  However, when the above thermosetting coating is formed on a bar material or a plate material using the water-soluble electrodeposition paint disclosed in the patent document, (1) In the painting process, streaky coating unevenness, that is, random unevenness occurs on the painted surface. There is a tendency, (2) There are cases where this uneven stripe disappears in the baking process, and there are cases where the uneven stripe remains. When sealing is applied to the wall of the building so that the aluminum building material using the bar material or plate material that has been formed is installed in the building in the same manner as the actual construction, the sealing material peels off from the bar material or plate material. There is a phenomenon that a part occurs and tends to cause a sealing failure.

  The present invention has been made based on such circumstances, and the problem to be solved thereof is an aluminum building material having a scratch-resistant coating film that ensures scratch resistance of a thermosetting coating film and eliminates appearance defects and sealing defects. And to provide a manufacturing method thereof.

As a result of studying along the above-mentioned problems, the present inventors have found that (1) poor appearance of the thermosetting coating film is obtained by applying an aluminum building material to an electrodeposition tank by virtue of its large water contact angle and water repellency. For example, when the aluminum building material begins to dry with deposits such as resin components that do not precipitate remaining on the surface, traces of moisture containing the deposits concentrating on the surface of the aluminum building material and flowing down as liquid dripping (2) Sealing failure is caused by an adhesion inhibiting factor so that when a continuous water repellent point is formed, the water repellent point prevents the sealing from adhering in a linear or planar manner. (3) The appearance defects and sealing defects caused by these fluororesin powders are proportional to the dispersed content of the powder in the thermosetting coating film. Contrary to this, it is likely to occur when the amount is large, and does not occur when the amount is small. (4) The dispersion content of the fluororesin to such an extent that there is no appearance defect or sealing failure results in insufficient fluororesin on the surface layer of the thermosetting coating. (5) At this time, in addition to the fluororesin powder, if the polyolefin resin is further dispersed in the thermosetting film, the polyolefin resin When the cured coating film is thermally cured, it becomes wax particles that are leached and dispersed on the surface layer, and by effectively acting as a wax, the scratch resistance of the thermally cured coating film can be effectively secured together with the fluororesin powder. (6) Fluororesin powder And the presence of polyolefin resin wax particles, there is basically no appearance or sealing failure. (7) Fluorine resin powder lowers the coefficient of static friction in aluminum building materials, and polyolefin resin wax particles lower the coefficient of dynamic friction and synergistically act to scratch scratches and dust entrainment friction. In this case, the dispersion of the fluororesin powder and the polyolefin resin wax particles in the thermosetting coating is 0. If the content of the particles is less than 0.5 wt%, the scratches on the heat-cured coating film are likely to be caused by scratching or entraining friction, and the possibility of scratching is insufficient, while the fluororesin powder is 0%. If it exceeds 5 wt%, the appearance of the streaks will remain after the thermosetting coating is cured. In addition, there is a strong tendency to cause sealing defects, and even if the appearance and sealing defects are not caused by increasing or decreasing wax particles, it increases the gloss of the thermosetting coating film by increasing the wax particles. When electrodeposition coating is applied, the current efficiency gradually decreases, and if it exceeds 3.0 wt%, the gloss of the thermosetting coating will be high in light of commercially available aluminum building materials. We have gained knowledge about the fact that it acts to reduce the commercial value due to excess, and to reduce the current efficiency in electrodeposition coating and to waste power consumption .

The present invention has been made on the basis of such knowledge. The invention according to claim 1 is an aluminum building material in which scratch resistance is imparted to a thermosetting coating film, including a coating film surface layer of the thermosetting coating film. Both the dispersed fluororesin powder and the polyolefin resin wax particles leached and dispersed on the surface of the coating film are dispersed and contained, and the dispersion content of the powder in the thermosetting coating film is 0.05 to 0.5 wt%. An aluminum building material having a scratch-resistant coating film characterized by having a dispersed content of wax particles of 0.05 to 3.0 wt% .

The invention according to claim 2 is mainly for manufacturing aluminum building materials by electrodeposition coating of bar material, and by using water-soluble thermosetting resin paint, fluororesin powder and polyolefin resin are transferred to coating film. Since the rate is about 60% in the former and about 70% in the latter, a production method is provided in which the wax content of the fluororesin powder and the polyolefin resin is made the dispersion content in the above preferred form in consideration of the migration rate. Thus, this is a water-soluble thermosetting resin containing 0.05 to 0.5 phr of fluororesin powder and 0.05 to 3.0 phr of polyolefin resin with respect to resin components other than fluororesin powder and polyolefin resin. The coating process for coating the paint on the aluminum chemical conversion film or aluminum anodized film, and the coated thermosetting resin paint is heat-cured and applied to the surface layer. Is obtained by the manufacturing method of the aluminum building material having a scratch resistance coating, characterized in that it comprises a baking step of leaching dispersing the serial polyolefin resin.

The invention according to claim 3 is also used to produce aluminum building materials, which are mainly plate materials, in many cases where a coating method other than electrodeposition coating is employed. Similarly, the fluororesin powder and polyolefin resin wax particles are dispersed in the preferred form. In order to provide a production method having a content, 0.05 to 0.5 phr of the fluororesin powder and 0.05 to 3 of the polyolefin resin with respect to the resin components other than the fluororesin powder and the polyolefin resin. A coating process in which 0.0 phr of a thermosetting resin coating is applied to a chemical conversion film of aluminum by roll coating, spray coating or flow coating, and the coated thermosetting resin coating is thermally cured and the polyolefin resin is leached on the surface layer. A method for producing an aluminum building material having a scratch-resistant coating film characterized by comprising a baking step to disperse A.

  The present invention uses each of these as the gist of the invention as means for solving the above problems.

  Since the present invention is configured as described above, the invention according to claim 1 provides an aluminum building material having a scratch-resistant coating film that ensures the scratch resistance of the thermosetting coating film and eliminates appearance defects and sealing defects. be able to.

The invention according to claim 2 provides a manufacturing method in which the fluororesin powder and the polyolefin resin wax particles are dispersed in the above preferred form, mainly for manufacturing aluminum building materials by electrodeposition coating of bar material. can do.

The invention according to claim 3 is also used to produce aluminum building materials, which are mainly plate materials, in many cases where a coating method other than electrodeposition coating is employed. Similarly, the fluororesin powder and polyolefin resin wax particles are dispersed in the preferred form. The manufacturing method which makes it content can be provided.

  Hereinafter, the present invention will be described in more detail. FIG. 1 is a longitudinal sectional view showing a model of a composite coating formed on an aluminum building material. In FIG. 1, 1 is an aluminum substrate of bar material or plate material, and 2 is a composite material. An anodized film 3 located on the aluminum substrate 1 side of the film, 3 is a thermosetting resin coating film coated on the anodized film 2, and the thermosetting resin coating film 3 was dispersed including the coating surface layer. Both the fluororesin powder 31 and the polyolefin resin wax particles 32 leached and dispersed on the surface of the coating film are dispersed, whereby the thermosetting coating film 3 of the aluminum building material has a coefficient of static friction. The wax particles 32 of the polyolefin resin lower the dynamic friction coefficient and synergistically act to ensure scratch resistance against scratching and dust entrainment friction. There as. At this time, the thermosetting coating film 3 contains both the fluororesin powder 31 and the polyolefin resin wax particles 32 in a dispersed manner, but has a coating surface with good color matting, and has a poor appearance such as stripes. In addition, it has good adhesion to the sealing material used for waterproofing between the walls and has the above-mentioned scratch resistance suitable as an aluminum building material for use in installations such as aluminum sashes and aluminum curtain walls. As provided.

At this time, the dispersion content of the fluororesin powder 31 in the thermosetting coating film 3 is 0.05 to 0.5 wt%, and the dispersion content of the wax particles 32 of the polyolefin resin is 0.05. ˜3.0 wt%, thereby reducing the static friction coefficient due to the inclusion of the fluororesin powder 31 and reducing the dynamic friction coefficient due to the inclusion of the wax particles 32 of the polyolefin resin, and preferable scratch resistance due to their synergistic action. As a result, the fluororesin powder 31 and the wax particles 32 are each less than 0.05 wt%, thereby eliminating the possibility of scratches due to the high static friction coefficient and the dynamic friction coefficient, and the fluororesin powder 31 Appearance of streak unevenness due to exceeding 0.5wt%, non-sealing In addition, the glossiness of the thermosetting coating due to the wax particles 32 exceeding 3.0 wt% and the decrease in current efficiency during the formation of the thermosetting coating 3 are prevented. .

  For thermosetting coatings, for example, various paints mainly composed of acrylic, melamine, polyester, and other thermosetting resins are used in accordance with conventional methods, and fluororesin powders are PVdF (polyvinylidene fluoride resin), PTFE. (Tetrafluoroethylene resin), BTFE (tetrafluoroethylene / ethylene resin), FEP (tetrafluoroethylene / hexafluoropropylene resin), etc. can be used. Polyolefin resins are ethylene , Homopolymers of olefins such as propylene and butene, or copolymers selected from different polyolefins are used.

  At this time, fluororesin powders having various particle diameters with an average particle diameter of about 0.1 μm to several hundred μm are commercially available. The average particle diameter of the fluororesin powder is about 0.2 μm to 7 μm. In order to obtain a thermosetting coating film having a reduced coefficient of static friction suitable for the scratch resistance of aluminum building materials, it is preferable to disperse it in a water-soluble electrodeposition coating. That is, when the average particle size of fluororesin powder is less than 0.2 μm, the price becomes expensive and impractical as an aluminum building material. On the other hand, when it exceeds 7 μm, the film thickness of this kind of thermosetting coating is generally less than 10 μm. Therefore, as a result of the inclusion of a film having a thickness close to that of the thermosetting coating film, there is a possibility of affecting the coating film performance such as adhesion, surface roughness and impact resistance of the thermosetting coating film.

  Polyolefin resins are commercially available with a melting point of about 50 ° C. to about 150 ° C. and low to high polarity, but wax particles having a melting point of about 100 to 140 ° C., preferably 100 to 130 ° C. In order to obtain a thermosetting coating film having a reduced coefficient of kinetic friction suitable for the scratch resistance of aluminum building materials, it is preferable to disperse this in a water-soluble electrodeposition paint. At this time, the wax particle of the polyolefin resin has an average particle size of about 1.5 to 7 μm, for example, about 2.5 to 7 μm. However, it is preferable for eliminating the possibility of scratches.

Production of aluminum building materials with scratch-resistant coatings includes 0.05-0.5 phr of fluororesin powder and 0.05-3.0 phr of polyolefin resin for resin components other than fluororesin powder and polyolefin resin. A coating process for electrodeposition-coating the water-soluble thermosetting resin paint on the anodized film of aluminum, and a baking process for leaching and dispersing the polyolefin-based resin on the surface layer of the coated thermosetting resin paint. Thus, the thermosetting coating film 3 having scratch resistance can be formed by the contents of the fluororesin powder 31 and the wax particles 32, and the glossiness of the thermosetting coating film is excessively increased. It can prevent that the current efficiency fall at the time of thermosetting coating 3 formation.

  The anodizing process, coating process, and baking process for forming the anodized film may be performed in accordance with conventional methods, and the thermosetting coating film electrodeposited on the aluminum building material through the coating process and baking process. Is crosslinked and thermally cured, and the fluororesin powder 31 is dispersed and contained in the thermosetting coating 3 including the coating surface, and the polyolefin resin wax particles 32 are leached and dispersed in the coating surface. To be contained. In other words, the fluororesin powder is compatible with water-soluble thermosetting paints, so that it is uniformly dispersed in the water-soluble thermosetting paints by blending, and in this dispersed state, it is electrodeposited on aluminum building materials and the thermosetting paints are thermoset. While the coating film is formed, the polyolefin resin wax particles 32 are similarly electrodeposited in a dispersed state in the thermosetting paint, but are melted by receiving a high temperature in the baking process and have a leaching property. In the leaching state, the coating is formed by heat curing.

In the above example, a thermosetting resin coating was formed by electrodeposition coating on the anodized coating. However, the thermosetting resin has scratch resistance by dispersing and containing fluororesin powder and polyolefin resin wax particles. For coating materials such as bars and plates for aluminum building materials, especially for panel materials such as curtain walls, the coating is formed by chemical conversion treatment of an aluminum substrate, for example, a coating formed by a chromium and aluminum oxide coating. can do. In this case, the manufacturing of aluminum building materials should be carried out by forming a chemical conversion film instead of the anodic oxide film and using a roll coating, spray coating or flow coating coating process instead of the electrodeposition coating process. do it. That is, the manufacturing method is that a thermosetting resin coating in which 0.05 to 0.5 phr of fluororesin powder and 0.05 to 3.0 phr of polyolefin resin are blended with resin components other than fluororesin and polyolefin resin is aluminum. A coating process for coating the chemical film of the coating by roll coating, spray coating or flow coating, and a baking process for leaching and dispersing the polyolefin resin on the surface layer of the coated thermosetting resin paint by heat curing. Good. At this time, for the thermosetting resin paint, fluororesin powder, and polyolefin resin wax particles, the same ones as described above are used, and the coating process of chemical conversion treatment, roll coating, spray coating or flow coating is performed in accordance with a conventional method. Just do it.

  As described above, in the thermosetting resin coating film in which the fluororesin powder and the polyolefin resin wax particles are dispersedly dispersed, the fluororesin powder shares the lowering effect of the static friction coefficient, and the wax particles share the lowering effect of the dynamic friction coefficient. The frictional resistance is greatly reduced, and the possibility of scratches caused by scratching or entraining friction to the thermosetting coating is eliminated as much as possible to ensure durability against these frictions. The aluminum building material can be free from defects and sealing defects.

  That is, Fig. 2 shows that when the fluorine resin powder content is zero and 0.1 wt%, the polyolefin resin content is changed to zero, 0.5 wt%, 1.0 wt%, and 3 wt%, and when the polyolefin resin is zero. And a graph showing the results of the indenter sliding test when the blending amount of the fluororesin powder is 0.5 wt% alone. According to this, when 0.1 wt% of the fluororesin powder is blended, the durability of the coating film is dramatically improved compared to when the powder is zero, and by blending 0.5 wt% of the polyolefin resin , Shows better durability when the fluororesin powder is 0.5 wt% alone. From FIG. 2, the thermosetting coating film contains both dispersed by blending fluororesin powder and polyolefin resin. It can be seen that these have a synergistic effect on the reduction of the friction coefficient.

  FIG. 3 shows that the friction coefficient when the fluororesin powder and the polyolefin resin are both zero is 100, the blending amount of the fluororesin powder is zero, the blending amount of the polyolefin resin is zero, 0.5 wt%, 1.0 wt %, 3.0 wt%, when the polyolefin resin content is zero, when the fluororesin powder is 0.5 wt%, and when the fluororesin powder content is 0.1 wt%, the polyolefin resin It is the graph which showed the relative friction coefficient when the compounding quantity of 0.5 wt%, 1.0 wt%, and 3.0 wt% is used. According to this, the wax particles of the polyolefin resin act to lower the dynamic friction coefficient, the fluororesin powder acts to lower the static friction coefficient, and both the fluororesin powder and the polyolefin resin are blended. It turns out that the static friction coefficient and the dynamic friction coefficient are lowered by this, especially the dynamic friction coefficient is greatly reduced.

Polytetrafluoroethylene resin (Sumitomo 3M Dyneon TF9207) and 0.1 phr, 0.1 phr polyethylene resin (manufactured by BYK Japan KK Aquamat263), with respect to a fluorine resin powder and a resin component other than polyolefin resins, 0. The thickness is changed to 3 phr, 0.5 phr, 1.0 phr, 2.0 phr, and 3.0 phr by using each electrodeposition paint blended with water-soluble thermosetting resin paint (manufactured by Shinto Paint Co., Ltd.). A JIS6063T5 aluminum plate (6 x 12 cm) with a 9 μm anodic oxide coating was electrodeposited at a voltage of 200 V to form a 10 μm thick electrodeposition coating, and the appearance of the electrodeposition coating was evaluated for visual defects. Went. Thereafter, the aluminum plate was baked at 200 ° C. for 30 minutes to form a thermosetting coating film containing the fluororesin powder and the polyolefin resin, and the appearance of the thermosetting coating film was visually evaluated. Furthermore, as an indenter sliding test, an aluminum plate was fixed to the movable table of the sliding tester, and a load of 100 kg / cm ² was applied to the SUS ball indenter and placed on the aluminum plate, and then the movable table was moved back and forth. The number of sliding times (counting twice for each reciprocating movement) until the abrasion of the thermosetting coating film by the ball indenter (exposure of the anodic acid film by peeling of the thermosetting coating film) was measured. Table 1 shows the visual evaluation of the appearance defect and the evaluation of the indenter sliding test result.

  Example 1 was repeated except that the tetrafluoroethylene resin was changed to 0.3 phr. Table 1 shows the evaluation of the appearance defect and the evaluation of the indenter sliding test result.

  Example 1 was repeated except that the tetrafluoroethylene resin was changed to 0.5 phr. Table 1 shows the evaluation of the appearance defect and the evaluation of the indenter sliding test result.

The same as Example 1 except that the tetrafluoroethylene resin was changed to 0.05 phr. Table 1 shows the evaluation of the appearance defect and the evaluation of the indenter sliding test result.

Comparative Example 1

  Example 1 was repeated except that the tetrafluoroethylene resin was changed to 0 phr. Table 1 shows the evaluation of the appearance defect and the evaluation of the indenter sliding test result.

Comparative Example 2

  Example 1 was repeated except that the tetrafluoroethylene resin was changed to 0.01 phr. Table 1 shows the evaluation of the appearance defect and the evaluation of the indenter sliding test result.

Comparative Example 3

  The same as Example 1 except that the tetrafluoroethylene resin was changed to 0.03 phr. Table 1 shows the evaluation of the appearance defect and the evaluation of the indenter sliding test result.

Comparative Example 4

  Example 1 was repeated except that the tetrafluoroethylene resin was changed to 1.0 phr. Table 1 shows the evaluation of the appearance defect and the evaluation of the indenter sliding test result.

It is a longitudinal cross-sectional view of the aluminum which shows the distribution model of fluororesin powder and polyolefin resin wax particle. It is a bar graph which shows the result of the indenter sliding test by the mixing | blending of fluororesin powder and polyolefin resin. It is a bar graph which shows the change of the friction coefficient by mixing | blending of fluororesin powder and polyolefin resin.

DESCRIPTION OF SYMBOLS 1 Aluminum base body 2 Anodized film 3 Thermosetting resin coating film 31 Fluoro resin powder 32 Wax particle

Claims (3)

An aluminum building material imparting scratch resistance to a thermosetting coating film, comprising fluororesin powder dispersed including the surface layer of the thermosetting coating film, and wax particles of polyolefin resin leached and dispersed on the coating surface layer It is characterized in that both are dispersed and the dispersion content of the powder in the thermosetting coating film is 0.05 to 0.5 wt%, and the dispersion content of the wax particles is 0.05 to 3.0 wt%. Aluminum building material with scratch-resistant coating . A water-soluble thermosetting resin coating containing 0.05 to 0.5 phr of fluororesin powder and 0.05 to 3.0 phr of polyolefin resin to a resin component other than fluororesin powder and polyolefin resin is formed from an aluminum chemical film. A scratch-resistant coating film comprising: a coating step of coating an anodized film of aluminum; and a baking step of leaching and dispersing the polyolefin-based resin on the surface layer of the coated thermosetting resin coating by thermosetting. A method for producing aluminum building materials. Rolls a thermosetting resin coating containing 0.05 to 0.5 phr of fluororesin powder and 0.05 to 3.0 phr of polyolefin resin to a resin component other than fluororesin powder and polyolefin resin on an aluminum conversion coating A scratch-resistant coating film comprising: a coating process for coating by spray coating or flow coating; and a baking process for leaching and dispersing the polyolefin resin on the surface layer of the coated thermosetting resin paint by thermosetting A method for manufacturing an aluminum building material.

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