JP2011016570A - Paint for wine can, coated metal plate for wine can, and wine can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paint for wine can by which the molding property and corrosion resistance of a coated metal plate equipped with a coating film made by applying the paint are high, and the corrosion resistance of a wine can equipped with this coating film is high, and to provide the coated metal plate for wine can and the wine can.SOLUTION: This paint for wine can contains calcium carbonate 11, a polyolefine of which the polymerization degree is from 200 to 800, or its derivative 13, and a thermosetting resin 15. Also, this coated metal plate 30 for wine can is equipped with the coating film 10f which is formed by applying the paint for wine can at least on one surface of a metal plate 20. Also, this wine can is equipped with the coating film which is formed by applying the paint for wine can at least on the internal surface of the internal surface and the external surface of the can body.

Description

  The present invention relates to a paint for wine cans, a coated metal plate for wine cans and a wine can used for the production of wine cans.

Wine is usually supplemented with an appropriate amount of sulfite (less than 350 ppm remaining as free SO ₂ (sulfur dioxide)) as an essential additive to control wild yeast during fruit juice fermentation and / or control ripening. ing. When such a wine is filled into a metal can and canned, the corrosive sulfurous acid added to the wine is so corrosive that the metal can easily corrodes, and sulfurous acid (especially free SO _{2 in the} wine) There is a problem that hydrogen sulfide generated by the oxidation-reduction reaction with the metal forming the can deteriorates the flavor (flavor) of wine.

  In order to solve this problem, Japanese Patent Laid-Open No. 2006-62688 (Patent Document 1) discloses a wine in which calcium carbonate is added as a scavenger that reacts with sulfurous acid in a resin layer formed on the inner surface side of a wine can. Metal cans for canning have been proposed.

  Here, as a metal can for wine cans, metal cans such as 3-piece cans, 2-piece cans, and bottle-type cans that are used as containers for general beverage cans are used. Of these metal cans, the three-piece can is formed by joining the sides of the body of the can by welding, adhesion and / or caulking (side seam), and the canopy is formed at each end opening of the can body. And the bottom lid has a joint part by double winding or the like. The two-piece can has a canopy attached to an opening of a cylindrical or rectangular tube-shaped bottomed can formed by drawing or drawing and squeezing a flat plate blank. In addition, the bottle-type can has a cylindrical bottomed can whose bottom side is molded into the mouth neck and shoulders, and a separate bottom lid is fastened and fastened to the opening of the bottomed can. There is a type in which the opening side of the bottomed can of the mold is formed in the mouth neck and shoulder and a separate stopper is attached.

JP 2006-62688 A

  However, the metal can for wine canning disclosed in the cited document 1 is subjected to drawing and / or ironing from a resin-coated metal plate in which the surface to be the inner surface of the can is coated with a resin layer to which calcium carbonate is added. Since it is formed into a piece can or bottle type can, the resin layer becomes brittle due to the calcium carbonate added to the resin layer, and there is a problem that the moldability and corrosion resistance of the resin-coated metal plate are reduced during the production of wine cans. there were. In addition, even when a three-piece can is formed from a resin-coated metal plate, there is a problem that the moldability and corrosion resistance of the resin-coated metal plate are reduced because it undergoes molding, welding, adhesion, and / or crimping. was there.

  Furthermore, the metal can for wine can obtained as described above is cracked in the resin layer due to impact caused by collision between cans or collision between the can and the transport guide rail when the can is transported. There is a problem that the dent resistance is lowered and / or peeling occurs. In particular, since the metal corrosiveness of the wine as a content is high, the metal can for wine canning has high corrosion resistance due to the wine as a content, so that a conventional paint such as an epoxy paint or Depending on the paint, etc., in which an inorganic filler is added to the conventional paint to increase the rigidity of the paint film, the metal adhesion of the paint film and the metal coverage by the paint film (meaning the coverage or coverage) are maintained. There was a problem that the corrosion resistance was reduced.

  Accordingly, the present invention provides a coating material for wine cans having high moldability and corrosion resistance of a coated metal plate provided with a coating film to which a coating material is applied, and a high corrosion resistance of a wine can having such a coating film, and a coating metal for wine cans. The purpose is to provide plates and wine cans.

  The present invention is a wine can paint comprising calcium carbonate, a polyolefin having a degree of polymerization of 200 or more and 800 or less, or a derivative thereof, and a thermosetting resin.

  In the wine can paint according to the present invention, the polyolefin derivative has at least one functional group selected from the group consisting of —Cl group, —OH group, —COOH group and epoxy group bonded to a carbon atom of the polyolefin. Can be included. Further, the polyolefin or a derivative thereof can have a mass average molecular weight of 25000 or more and 250,000 or less. Further, the calcium carbonate is 15 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the thermosetting resin, and the polyolefin or its derivative is 5 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the thermosetting resin. be able to.

  Moreover, this invention is a coating metal plate for wine cans provided with the coating film by which said coating material for wine cans is apply | coated to at least one main surface of a metal plate. Moreover, this invention is a wine can provided with the coating film by which one of said wine can coating materials is apply | coated to the inner surface of a can body and the at least inner surface of an outer surface.

  ADVANTAGE OF THE INVENTION According to this invention, the coating metal plate provided with the coating film by which a coating material is apply | coated has high moldability and corrosion resistance, and the corrosion resistance of the wine can provided with this coating film is high, and the coating material for wine cans and the coating metal for wine cans Plates and wine cans can be provided.

It is a schematic cross section which shows one Embodiment of the coating material for wine cans concerning this invention. It is a schematic cross section which shows one Embodiment of the coating metal plate for wine cans concerning this invention.

(Embodiment 1)
With reference to FIGS. 1 and 2, a wine can paint 10 according to an embodiment of the present invention includes calcium carbonate 11, a polyolefin having a degree of polymerization of 200 to 800, or a derivative 13 thereof, and a thermosetting resin 15. Including.

In the wine can paint 10 according to the present embodiment, the calcium carbonate 11 contained in the paint reacts with sulfurous acid added to the wine, particularly SO ₂ released from sulfurous acid in the wine. Corrosion resistance of the coated metal plate 30 for a wine can provided with the coating film 10f to be formed is increased.

The wine can paint 10 of the present embodiment further includes a polyolefin having a degree of polymerization of 200 or more and 800 or less or a derivative 13 thereof, and a thermosetting resin 15. Here, in the wine can paint 10 and the coating film 10f, a sea-island resin structure (mass of polyolefin and its derivative) in which a polyolefin having a degree of polymerization of 200 or more and 800 or less or its derivative 13 is dispersed in the thermosetting resin 15 is used. When the number of parts is equal to or less than the number of parts by mass of the thermosetting resin, see FIG. 1 and FIG. 2), or the sea-island resin structure in which the thermosetting resin 15 is dispersed in the polyolefin or its derivative 13 (the mass of the polyolefin and its derivative) When the number of parts is larger than the number of parts by mass of the thermosetting resin, it is not shown), and the sea-island structure in which the calcium carbonate 11 is dispersed in the thermosetting resin 15 and the polyolefin or its derivative 13 having such a sea-island resin structure. Have For this reason, the flexibility of the coating film 10f is increased and the penetration of free SO ₂ into the coating film 10f is suppressed, so that the wine in which the coating film 10f is formed by applying the wine can coating 10 is formed. The formability and corrosion resistance of the can-coated metal plate 30 are increased.

  Here, the sea-island resin structure cannot be observed visually or using a normal optical microscope, but can be observed using an electron microscope or the like. The sea-island structure can be observed using a normal optical microscope, electron microscope, or the like.

  The polyolefin or its derivative 13 contained in the wine can coating material 10 of this embodiment has a degree of polymerization of 200 or more and 800 or less. If the degree of polymerization is less than 200, it becomes difficult to increase the moldability and corrosion resistance of the wine can coated metal plate 30 to which the wine can coating 10 is applied. If the degree of polymerization is greater than 800, thermoplastic resin and polyolefin Alternatively, a good wine can paint cannot be obtained due to low compatibility with the derivative. From this viewpoint, it is preferable that the degree of polymerization of the polyolefin or its derivative 13 is 300 or more and 600 or less.

  Here, the polyolefin is not particularly limited, but polyethylene, polypropylene, and the like are preferable from the viewpoint of high moldability of the wine can coated metal plate 30 to which the wine can coating 10 is applied.

  The polyolefin derivative is not particularly limited. However, the reactivity of the paint 10 for wine cans is high, and the coating film 10f obtained has high barrier properties, so that the corrosion resistance of the coated metal plate 30 for wine cans is high. From the viewpoint of high, it preferably contains at least one functional group selected from the group consisting of —Cl group, —OH group, —COOH group and epoxy group bonded to the carbon atom of the polyolefin. A derivative of a polyolefin can include one or more and one or more functional groups from -Cl, -OH, -COOH, and epoxy groups attached to the carbon atom of the polyolefin. For example, as a polyolefin derivative containing a —Cl group bonded to a carbon atom of polyolefin, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl acetate copolymer, and the like can be given. Moreover, polyvinyl alcohol etc. are mentioned as a polyolefin derivative containing -OH group couple | bonded with the carbon atom of polyolefin. Examples of the polyolefin derivative containing a —COOH group bonded to a carbon atom of polyolefin include vinyl acetate polymer, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, and the like. Examples of the polyolefin derivative containing an epoxy group bonded to a carbon atom of the polyolefin (that is, an epoxy group having an oxygen atom that crosslinks to the carbon atom of the polyolefin) include an epoxy-modified vinyl chloride-vinyl acetate polymer. Here, the vinyl chloride-vinyl acetate copolymer is a polyolefin derivative containing a —Cl group and a —COOH group bonded to the carbon atom of the polyolefin, and the epoxy-modified vinyl chloride-vinyl acetate polymer is bonded to the carbon atom of the polyolefin. Polyolefin derivatives containing bonded epoxy, -Cl and -COOH groups. The carbon atom of the polyolefin is not particularly limited as long as it is a carbon atom contained in the polyolefin, but is preferably a carbon atom contained in the main chain of the polyolefin from the viewpoint of easily obtaining a flexible coating film.

  The polyolefin or derivative 13 thereof is not particularly limited, but preferably has a mass average molecular weight of 25,000 to 250,000. If the weight average molecular weight is less than 25000, it becomes difficult to increase the moldability and corrosion resistance of the wine can coated metal plate 30 to which the wine can coating 10 is applied. If the weight average molecular weight is greater than 250,000, the thermoplastic resin is used. And a good wine can paint cannot be obtained because of low compatibility between polyolefin and its derivatives. From this viewpoint, the polyolefin or its derivative 13 preferably has a mass average molecular weight of 50,000 or more and 200,000 or less.

  Moreover, although there is no restriction | limiting in particular in the calcium carbonate 11 contained in the coating material 10 for wine cans of this embodiment, It is preferable that they are 15 mass parts or more and 100 mass parts or less with respect to 100 mass parts of thermosetting resins. If the calcium carbonate is less than 15 parts by mass with respect to 100 parts by mass of the thermoplastic resin, the corrosion resistance of the wine can coated metal plate 30 does not increase. If the calcium carbonate is greater than 100 parts by mass, the coated metal for wine cans Since the moldability of the plate 30 is lowered, the corrosion resistance is not increased. From this viewpoint, the calcium carbonate is more preferably 25 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of the thermoplastic resin.

  Moreover, it is preferable that polyolefin or its derivative 13 contained in the paint 10 for wine cans of this embodiment is 5 to 50 mass parts with respect to 100 mass parts of thermosetting resins. If the polyolefin or its derivative is less than 5 parts by mass with respect to 100 parts by mass of the thermoplastic resin, the moldability and corrosion resistance of the coated metal plate for wine can 30 will not be high, and the polyolefin or its derivative will be greater than 50 parts by mass. Further, since the mechanical strength of the coating film 10f of the coated metal plate 30 for wine cans decreases, the moldability and corrosion resistance of the coated metal plate 30 for wine cans do not increase. From this viewpoint, the polyolefin or its derivative is preferably 10 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the thermoplastic resin.

  Further, the thermosetting resin contained in the wine can coating material 10 of the present embodiment is not particularly limited as long as it can form a coating film by curing the coating material, and is an epoxy resin, a phenol resin, or a polyester resin. An acrylic resin, an amino resin, a mixed resin of these resins, a compound resin, and the like can be mentioned, but from the viewpoint of use also for coating the inner surface of a wine can, an epoxy resin, a phenol resin, a mixed resin of these resins or a compound resin is preferable. .

  The paint for wine cans of this embodiment is applied to at least one main surface of a metal plate to produce a coated metal plate, and then the painted metal plate is processed to produce a wine can. In any case where a wine can is prepared by applying it to at least the inner surface and the outer surface of the can body after producing the body, the corrosion resistance of the wine can can be increased.

  In addition, the paint for wine cans of this embodiment is not limited to the paint for wine cans stuffed with wine, but for cans stuffed with beverages or foods to which sulfite is added in order to improve the storage stability even for other than wine. These paints are also included. If the paint for wine cans of this embodiment is a beverage or food to which sulfurous acid is added, even if it is a beverage or food other than wine, the above-mentioned effects are exhibited in cans filled with such beverage or food. Because it can.

(Embodiment 2)
A wine can coating metal plate 30 according to another embodiment of the present invention includes a coating film 10 f formed by applying the wine can paint 10 of Embodiment 1 on at least one main surface of the metal plate 20.

  The wine can coated metal plate 30 of the present embodiment has the wine can paint of the first embodiment (that is, calcium carbonate, a polyolefin having a polymerization degree of 200 or more and 800 or less, or a derivative thereof, and thermosetting on at least one main surface. Since the coating film 10f formed by applying a paint for wine cans containing a conductive resin) is provided, the moldability and the corrosion resistance are high.

  Here, the metal plate 20 used for the wine can coating metal plate 30 is not particularly limited as long as it is used as a wine can, but from the viewpoint of a metal steel plate widely used as a beverage can, an aluminum plate, steel A plate or the like is preferably used.

  Further, the thickness of the coating film 10f formed by applying the wine can coating material 10 of the first embodiment on the metal plate 20 of the wine can coating metal plate 30 is not particularly limited. From the viewpoint of improving the formability and corrosion resistance of the coated metal plate 30, it is preferably 2 μm or more and 15 μm or less, and more preferably 3 μm or more and 12 μm or less.

  Note that the coated metal plate for wine cans of this embodiment is not limited to the coated metal plate for wine cans stuffed with wine, but drinks or foods to which sulfite is added to enhance the storage stability even for other than wine. Also included are painted metal plates for cans. If the coated metal plate for wine cans of this embodiment is a beverage or food to which sulfurous acid is added, even if it is a beverage or food other than wine, the above-mentioned effects can be achieved in a can packed with such beverage or food. It is because it can be demonstrated.

(Embodiment 3)
A wine can according to still another embodiment of the present invention includes a coating film obtained by applying the wine can paint according to the first embodiment to at least the inner surface of the can body and the outer surface. The can body is not particularly limited, but is preferably formed of a metal plate from the viewpoints of moldability and durability. The metal plate is preferably an aluminum plate or a steel plate from the viewpoint of a metal steel plate that is widely used as a beverage can.

  The wine can according to the present embodiment includes the wine can coating material according to the first embodiment (that is, calcium carbonate, a polyolefin having a polymerization degree of 200 or more and 800 or less, or a derivative thereof, and thermosetting on at least an inner surface and an outer surface of the can body. Since the coating film 10f formed by applying a paint for wine cans containing a conductive resin) is provided, the moldability and the corrosion resistance are high.

  The method for producing the wine can of the present embodiment is not particularly limited, and the wine can of the second embodiment provided with a coating film in which the paint for the wine can of the first embodiment is applied to at least one main surface of a metal plate. The coated metal plate may be processed into a can shape. Moreover, after processing a metal plate into a can shape beforehand, the coating material for wine cans of Embodiment 1 may be apply | coated to at least the inner surface of the inner surface and outer surface of a can body, and a coating film may be formed. Here, the thickness of the coating film formed on the wine can is not particularly limited, but is preferably 2 μm or more and 15 μm or less, and more preferably 3 μm or more and 12 μm or less from the viewpoint of enhancing the corrosion resistance of the wine can.

  In addition, the wine can of this embodiment is not limited to a wine can filled with wine, but also includes cans filled with beverages or foods to which sulphite is added in order to improve storage stability even if it is other than wine. This is because the wine can of the present embodiment can exert the above-described effects on beverages or foods other than wine as long as it is a beverage or food to which sulfurous acid is added.

  The wine can paint and wine can coating metal plate of the above embodiment will be described more specifically with the following Examples I to IX.

Example I
Example I includes Comparative Examples I-R1 for wine can coatings that do not contain polyolefin or its derivatives, and Examples I-1 to I-5 and Comparative Example I for wine can coatings that contain polyolefin (polypropylene). -R2-I-R3 is included. Here, Examples I-1 to I-5 and Comparative Examples I-R2 to I-R3 are obtained by changing the polymerization degree of polyolefin (polypropylene) contained in the paint for wine cans.

1. Preparation of wine can coating material A premixed composition containing the composition shown in Table 1 is put into a stirring vessel and premixed. The dispersion condition by the Glen mill is about 40 ° C., the coating flow rate is 4 liters / minute, the rotation speed is 3000 rpm, By mixing with a pass time of about 1 minute, a uniform paint for wine cans was obtained. The particle size of calcium carbonate contained in such a paint for wine cans was 0.05 μm as measured using a laser diffraction particle size distribution analyzer (SALD-2000 manufactured by Shimadzu Corporation).

2. Production of Paint Metal Plate for Wine Can The above-mentioned paint for wine can was applied to one main surface of an aluminum plate having a thickness of 0.3 mm with a basis weight of 14 g / m ² using a wire bar. Next, the metal plate coated with the paint for wine cans is heated in air at 200 ° C. for 10 minutes to cure the paint on the metal plate to form a film to obtain a coated metal plate for wine cans. It was. The thickness of the obtained coating film was 4 μm as measured using a microcage.

3. Manufacture of a wine can The aluminum plate having a thickness of 0.12 mm is obtained by squeezing and processing the painted metal plate for a wine can so that the main surface on which the coating film of the painted metal plate for the wine can is the inner surface of the can. A wine can was made. Here, the processing rate in drawing ironing was 60%. Here, the processing rate is expressed by the following equation (1) using the thickness T ₁ of the coated metal plate before processing and the minimum thickness T ₂ of the coated metal plate after processing.
Processing rate (%) = 100 × (T ₁ −T ₂ ) / T ₁ (1)
It is represented by

  In Example I, a can of a wine can was produced by the above drawing ironing process. However, processing methods other than those described above can be used to produce any of the three-piece can, the two-piece can, and the bottle-type can.

4). Evaluation of Physical Properties of Painted Metal Plate of Wine Can Regarding the wine can, the moldability of the coated metal plate (including the moldability of the can) was evaluated as follows. 1% by mass of an aqueous solution containing 1% by mass of sodium chloride and 0.1% by mass of lapisol is placed in the can of the molded wine can, the can body is used as an anode, and the copper electrode immersed in the aqueous solution is used as a cathode. A voltage of 6 V was applied between the cathode and the cathode, and a current value (unit: mA) 3 seconds after the voltage application was measured. The worse the formability of the painted metal plate, the more the current value increases because the coating film has defects. Measure the current value in the above conditions for 20 wine cans molded by the above processing, those whose average value is less than 0.1 mA, those average value is 0.1 mA or more and less than 1 mA and those Those having a maximum value of less than 3 mA were evaluated as good, those having an average value of 1 mA or more, or those having a maximum value of 3 mA or more as poor.

  Moreover, about the said wine can, the corrosion resistance of the coating metal plate was evaluated as follows. After the molding, the can of the wine can was filled with 250 ml of sulfite-added wine (sulfurous acid concentration: 100 ppm) and stored in a 55 ° C. storage for one month, and then the corrosion state of the inner surface of the can was visually confirmed. The case where corrosion was not observed on the inner surface of the can was evaluated as good, the corrosion observed on the inner surface of the can was very small and only the surface was evaluated as good, and the case where the corrosion observed on the inner surface of the can was significant was evaluated as poor.

  In addition, the compatibility of the thermosetting resin with the polyolefin or its derivative in the wine can coating was evaluated as follows. Excellent when the paint is not separated at all in the paint and the paint is transparent. Very slight fogging occurs in the paint, but the paint becomes transparent when stirred. The paint becomes cloudy and even when stirred, the paint does not become transparent. The thing was evaluated as bad. The results are summarized in Table 1.

  Referring to Table 1, a wine can paint containing calcium carbonate, a polyolefin (polypropylene) having a polymerization degree of 200 or more and 800 or less, and a thermosetting resin (epoxy resin and phenol resin) is a polyolefin and a thermosetting resin. Compatibility with resin increased. In addition, the coated metal plate for wine cans provided with a coating film formed by applying the paint for wine can on one main surface of the metal plate has high moldability and corrosion resistance. From this point of view, the degree of polymerization of polyolefin (polypropylene) contained in the paint for a wine can and the coating film was more preferably from 300 to 600.

Example II
Example II is a comparative example II-R1 for a wine can coating that does not contain polyolefin or its derivatives, and examples II-1 to II-5 for a wine can coating that contains a polyolefin derivative (polyvinyl chloride). And Comparative Examples II-R2 to II-R3. Here, Examples II-1 to II-5 and Comparative Examples II-R2 to II-R3 are obtained by changing the polymerization degree of the polyolefin derivative (polyvinyl chloride) contained in the paint for wine cans. A wine can paint, a wine can coated metal plate and a wine can were produced in the same manner as in Example I except that the paint composition having the formulation shown in Table 2 was used. The physical properties were evaluated. The results are summarized in Table 2.

  Referring to Table 2, a paint for a wine can containing calcium carbonate, a polyolefin derivative (polyvinyl chloride) having a polymerization degree of 200 to 800 and a thermosetting resin (epoxy resin and phenol resin) is a polyolefin derivative. And the thermosetting resin became more compatible. In addition, a coated metal plate for wine cans having a coating film formed by applying the paint for wine can on one main surface of the metal plate has high moldability and corrosion resistance. From this point of view, the degree of polymerization of the polyolefin derivative (polyvinyl chloride) contained in the paint and coating for wine cans was more preferably from 300 to 600.

Example III
Example III includes Examples III-1 to III-5 for wine can coatings containing various polyolefin derivatives. A wine can paint, a wine can coated metal plate and a wine can were produced in the same manner as in Example I except that the paint composition having the formulation shown in Table 3 was used. The physical properties were evaluated. The results are summarized in Table 3.

  Referring to Table 3, calcium carbonate and various polyolefin derivatives (polyvinylidene chloride, polyvinyl alcohol, ethylene-vinyl acetate copolymer, epoxy-modified vinyl chloride-vinyl acetate copolymer or vinyl chloride-vinyl acetate copolymer) And a coated metal plate for a wine can comprising a coating formed by applying a paint for a wine can containing a thermosetting resin (epoxy resin and phenolic resin) to one main surface of the metal plate, And corrosion resistance increased.

Example IV
Example IV includes Examples IV-1 to IV-5 when the parts by weight of calcium carbonate are changed in the paint for wine cans. A wine can paint, a wine can coated metal plate and a wine can were produced in the same manner as in Example I except that the paint composition having the formulation shown in Table 4 was used. The physical properties were evaluated. The results are summarized in Table 4.

  Referring to Table 4, with respect to 100 parts by mass of thermosetting resin, 15 parts by mass or more and 100 parts by mass or less (preferably 25 parts by mass or more and 70 parts by mass or less) of calcium carbonate and 20 parts by mass of polyolefin (polypropylene) ), A coated metal plate for wine cans having high formability and corrosion resistance was obtained.

(Example V)
Example V includes Examples V-1 to V-5 when the number of parts by mass of polyolefin (polypropylene) is changed in the paint for wine cans.

  A wine can paint, a wine can coated metal plate and a wine can were produced in the same manner as in Example I except that the paint composition having the composition shown in Table 5 was used. The physical properties were evaluated. The results are summarized in Table 5.

  Referring to Table 5, with respect to 100 parts by mass of thermosetting resin, 30 parts by mass of calcium carbonate and 5 to 50 parts by mass (preferably 10 to 30 parts by mass) of polyolefin (polypropylene) By using a paint for wine cans containing, a coated metal plate for wine cans having high formability and corrosion resistance was obtained.

Example VI
Example VI includes Examples VI-1 to VI-5 when the parts by mass of calcium carbonate and polyolefin (polypropylene) are changed in the paint for wine cans. A wine can paint, a wine can coated metal plate and a wine can were produced in the same manner as in Example I except that the paint composition having the composition shown in Table 6 was used. The physical properties were evaluated. The results are summarized in Table 6.

  With reference to Table 6, 10 to 100 parts by mass (preferably 20 to 70 parts by mass) of calcium carbonate and 5 to 50 parts by mass with respect to 100 parts by mass of the thermosetting resin. By using a wine can paint containing polyolefin (polypropylene) (preferably 10 parts by mass or more and 30 parts by mass or less), a coated metal plate for wine cans having high formability and corrosion resistance was obtained.

(Example VII)
Example VII includes Examples VII-1 to VII-5 when the parts by mass of calcium carbonate were changed in the paint for wine cans. A wine can paint, a wine can coated metal plate and a wine can were produced in the same manner as in Example I except that the paint composition having the composition shown in Table 7 was used. The physical properties were evaluated. The results are summarized in Table 7.

  Referring to Table 7, with respect to 100 parts by mass of thermosetting resin, 15 parts by mass or more and 100 parts by mass or less (preferably 25 parts by mass or more and 70 parts by mass or less) of calcium carbonate and 20 parts by mass of polyolefin derivative (poly By using a paint for wine cans containing vinyl chloride), a coated metal plate for wine cans having high formability and corrosion resistance was obtained.

Example VIII
Example VIII includes Examples VIII-1 to VIII-5 when the number of parts by mass of the polyolefin derivative (polyvinyl chloride) was changed in the paint for wine cans. A wine can paint, a wine can coated metal plate and a wine can were produced in the same manner as in Example I except that the paint composition having the formulation shown in Table 8 was used. The physical properties were evaluated. The results are summarized in Table 8.

  Referring to Table 8, with respect to 100 parts by mass of thermosetting resin, 30 parts by mass of calcium carbonate and 5 to 50 parts by mass (preferably 10 to 30 parts by mass) of polyolefin derivative (poly By using a paint for wine cans containing vinyl chloride), a coated metal plate for wine cans having high formability and corrosion resistance was obtained.

Example IX
Example IX includes Examples IX-1 to IX-5 when the parts by mass of calcium carbonate and polyolefin derivative (polyvinyl chloride) are changed in the paint for wine cans. A wine can paint, a wine can coated metal plate and a wine can were produced in the same manner as in Example I except that the paint composition having the formulation shown in Table 9 was used. The physical properties were evaluated. The results are summarized in Table 9.

  Referring to Table 9, 10 parts by mass or more and 100 parts by mass or less (preferably 20 parts by mass or less 70 parts by mass) of calcium carbonate and 5 parts by mass or less 50 parts by mass or more (100 parts by mass of thermosetting resin) By using a wine can paint containing a polyolefin derivative (polyvinyl chloride) of preferably 10 parts by mass or more and 30 parts by mass or less, a coated metal plate for wine cans having high formability and corrosion resistance was obtained.

  In the above Examples I to IX, the corrosion resistance of the coated metal plate of a wine can obtained by molding from a coated metal plate having a coating film in which a coating is applied on one main surface. evaluated. For the coated metal plate provided with the coating film formed by spraying the paint on the inner surface of the wine can obtained by molding from the metal plate before painting, using the paint described in Examples I to IX above, When the corrosion resistance was evaluated, the same tendency as in Examples I to IX was observed.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10 wine can paint, 10f paint film, 11 calcium carbonate, 13 polyolefin or derivative thereof, 15 thermosetting resin, 20 metal plate, 30 painted metal plate for wine can.

Claims (6)

  A wine can paint comprising calcium carbonate, a polyolefin having a polymerization degree of 200 or more and 800 or less, or a derivative thereof, and a thermosetting resin.   The wine according to claim 1, wherein the polyolefin derivative contains at least one functional group selected from the group consisting of -Cl group, -OH group, -COOH group and epoxy group bonded to a carbon atom of the polyolefin. Paint for cans.   The paint for wine cans according to claim 1 or 2, wherein the polyolefin or a derivative thereof has a mass average molecular weight of 25,000 or more and 250,000 or less. The calcium carbonate is 15 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the thermosetting resin.
The said polyolefin or its derivative (s) is 5 mass parts or more and 50 mass parts or less with respect to 100 mass parts of said thermosetting resins, The coating material for wine cans in any one of Claim 1-3.   A coated metal plate for wine cans comprising a coating film formed by applying the paint for wine cans according to any one of claims 1 to 4 on at least one main surface of the metal plate.   A wine can provided with the coating film by which the coating material for wine cans in any one of Claims 1-4 is apply | coated to the inner surface of a can body and at least the inner surface of an outer surface.

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