JP4048140B2 - Painted glass container and manufacturing method thereof - Google Patents

Description

【００５９】
【表２】

【００６０】
【表３】

【００６１】
【発明の効果】
本発明の塗装ガラス容器の製造方法によれば、ガラス容器の表面に、界面活性剤を含む通電処理液からなる連続層または不連続層である通電処理層を設けることにより、均一な厚さの静電塗装層を有する塗装ガラス容器を容易に得られるようになった。
また、本発明の塗装ガラス容器の製造方法によれば、ガラス容器の表面に、界面活性剤を含む通電処理液からなる連続層または不連続層である通電処理層を設ける工程を含むことにより、均一な厚さの静電塗装層を有する塗装ガラス容器を効率的に得られるようになった。
【図面の簡単な説明】
【図１】 本発明の塗装ガラス容器の概略図である。
【図２】 本発明の塗装ガラス容器の製造方法におけるフローチャートを示す図である。
【図３】 本発明の塗装ガラス容器の製造方法に使用される通電処理装置の模式図である。
【図４】 通電処理の仕組みを説明するために供する図である。
【図５】 通電処理液の粒度分布チャートを示す図である（その１）。
【図６】 通電処理液の粒度分布チャートを示す図である（その２）。
【図７】 本発明の塗装ガラス容器の製造方法に使用される静電塗装装置の模式図である。
【図８】 本発明の塗装ガラス容器の製造方法に使用される別の静電塗装装置の模式図である。
【符号の説明】
８：ガラス容器
１０：静電塗装装置
６１：ミストチャンバー
８３：攪拌エアー
８５：邪魔板（ミスト整流板）
１００：静電塗装装置（塗装ガン）
１０６：高圧印加部
１０８：空気噴射孔
１１２：電極
１１５：塗料噴射孔[0001]
[Industrial application fields]
  The present inventionRegarding the manufacturing method of painted glass containers,In particular, it has a uniform electrostatic coating layerEfficient manufacturing method for painted glass containersAbout.
[0002]
[Prior art]
Conventionally, spray coating of liquid paint has been mainly performed as a coating means for glass containers. And in order to improve the decorating properties, after applying the liquid paint, decorative means such as printing and hot stamping have been further applied.
However, when spray coating is performed, there has been a problem that the liquid paint is scattered outside the desired portion of the glass container. That is, most of the liquid paint was discarded without forming a coating film, and there was an environmental problem in terms of resources that it must be efficiently recovered.
Then, the electrostatic coating method used for the coating of a metal material is proposed as a coating means with respect to a glass container.
However, the volume resistivity of the glass material has a very large value compared to that of the metal material, and the volume resistivity value is likely to fluctuate. Therefore, even when an attempt is made to coat a glass container by an electrostatic coating method, it has been extremely difficult to stably obtain a coating film having a sufficient thickness.
[0003]
On the other hand, after a conductive coating layer made of a conductive material for imparting conductivity is disposed on the surface of the glass container, a primer coat of 20 to 40 μm is applied on the conductive coating layer. Moreover, a method for producing a powder-coated glass container in which a powder coating is electrostatically coated is disclosed (for example, Patent Document 1).
However, in the disclosed method for manufacturing a powder-coated glass container, the manufacturing process is complicated, and the conductive material, the powder coating, and the primer coat each have high material costs. There was a problem that the manufacturing cost of the painted glass container was high. And the problem that it was difficult to form the coating film which has uniform thickness depending on the constituent material and size of a glass container was seen.
[0004]
[Patent Document 1]
JP-A-8-156940 (Claims)
[0005]
[Problems to be solved by the invention]
  Therefore, as a result of intensive studies, the inventors of the present invention, as a result of providing a continuous layer or a discontinuous layer made of a conductive treatment solution containing a surfactant, on the surface of the glass container, the liquid paint was statically removed. Even when electropainted, the present inventors have found that it adheres extremely efficiently and stably, and have completed the present invention.
  Therefore, the object of the present invention is toMethod for producing a coated glass container in which a coated glass container having an electrostatic coating layer having a uniform thickness can be efficiently obtained by electrostatic coatingIs to provide.
[0006]
[Means for Solving the Problems]
  According to the present invention,In the method of manufacturing a coated glass container, in which a continuous layer or a discontinuous layer made of an energization treatment liquid and an electrostatic coating layer made of a liquid paint are sequentially formed on the surface of the glass container,
  AtomizedIt consists of a combination of a polyoxyalkylene ether compound represented by the following formula (1) as a nonionic surfactant and a cationic surfactantContains surfactantBoth have a volume resistivity of 1 × 10 ^-Four ~ 1x10 ⁷ It is a value within the range of Ω · cmBy spraying energizing solution, The thickness is in the range of 0.05 to 10 μm, and the surface resistivity is 1 × 10 ^-Five ~ 1x10 ^Five It is a value within the range of Ω / □A first step of forming an energization treatment layer;
  A second step of forming an electrostatic coating layer by electrostatic coating of a liquid paint;
  The manufacturing method of the coated glass container characterized by including this is provided, and the problem mentioned above can be solved.
R1-O- (R2-O) _n H (1)
[In Formula (1), R1 represents an alkyl group having 3 to 15 carbon atoms which may have a substituent, and R2 represents an alkylene group having 1 to 100 carbon atoms which may have a substituent. , N represents an integer of 1-100. ]
  That is, by providing an energization treatment layer made of an energization treatment solution containing a surfactant, the surface resistivity value on the surface of the glass container is made uniform, and an electrostatic coating layer having a uniform thickness is stably formed. can do.
In addition, by using such a polyoxyalkylene ether compound, the influence of environmental conditions around the glass container is eliminated, the surface resistivity value on the surface of the glass container is further uniformed, and a uniform thickness is obtained. The electrocoating layer can be formed more stably.
In addition, by limiting the surface resistivity to such a range, the surface resistivity value on the surface of the glass container is further uniformed, and an electrostatic coating layer having a uniform thickness can be formed more stably. Can do.
Furthermore, by limiting the thickness to such a range, the influence of environmental conditions around the glass container is eliminated, the surface resistivity value on the surface of the glass container is further uniformed, and the static thickness of the uniform thickness is reduced. The electrocoating layer can be formed more stably.
[0013]
In carrying out the method for producing a coated glass container of the present invention, the application amount per unit time of the energization treatment liquid is 1 to 100 cm.^ThreeA value within the range of / min is preferable.
By carrying out in this way, the value of the surface resistivity on the surface of the glass container is made uniform, and an electrostatic coating layer having a uniform thickness can be stably formed.
[0014]
Moreover, when implementing the manufacturing method of the coating glass container of this invention, it is preferable to make the average particle diameter by the atomization process of an electricity supply process liquid into the value of less than 100 micrometers.
By carrying out in this way, the value of the surface resistivity on the surface of the glass container is further uniformed, and the electrostatic coating layer having a uniform thickness can be formed more stably.
[0015]
Moreover, when implementing the manufacturing method of the coating glass container of this invention, after implementing a 1st process, it is preferable to dry an electricity supply process liquid naturally on a conveyance path, and then to provide a 2nd process.
By carrying out in this way, the value of the surface resistivity on the surface of the glass container can be made uniform without providing a separate drying step for the energization treatment liquid.
[0016]
Moreover, when implementing the manufacturing method of the coating glass container of this invention, it is preferable to make the distance between a 1st process and a 2nd process into the value within the range of 0.5-20 m.
By carrying out in this way, the energization treatment liquid can be sufficiently dried, while the space for carrying out the process can be reduced in size.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
[First embodiment]
  In the first embodiment, as illustrated in FIGS. 1A and 1B, an energization treatment layer which is a continuous layer or a discontinuous layer made of an energization treatment liquid containing a surfactant on the surface of the glass container 2. 4, 4 'and a coated glass container 8 formed by sequentially forming an electrostatic coating layer 6 made of a liquid paint.It is a manufacturing method.
  That is,In the method of manufacturing a coated glass container, in which a continuous layer or a discontinuous layer made of an energization treatment liquid and an electrostatic coating layer made of a liquid paint are sequentially formed on the surface of the glass container,
  AtomizedIt consists of a combination of a polyoxyalkylene ether compound represented by the following formula (1) as a nonionic surfactant and a cationic surfactantContains surfactantBoth have a volume resistivity of 1 × 10 ^-Four ~ 1x10 ⁷ It is a value within the range of Ω · cmBy spraying energizing solution, The thickness is in the range of 0.05 to 10 μm, and the surface resistivity is 1 × 10 ^-Five ~ 1x10 ^Five It is a value within the range of Ω / □A first step of forming an energization treatment layer;
A second step of forming an electrostatic coating layer by electrostatic coating of a liquid paint;
It is a manufacturing method of the coating glass container characterized by including.
  In addition, FIG.Obtained by the manufacturing method of painted glass containersFIG. 1B shows a coated glass container when the energization process layer 4 is a continuous layer, and FIG. 1B shows a paint glass container when the energization process layer 4 ′ is a discontinuous layer.
[0018]
1. Glass container
(1) Shape
There are no particular restrictions on the shape of the glass container, and bottleneck type glass bottles, rectangular glass bottles, cylindrical glass bottles, irregular glass bottles, rectangular glass bottles, rectangular bottles, etc. Examples include a shaped glass box, a cylindrical glass box, and a deformed glass box.
[0019]
(2) Material
Moreover, it does not restrict | limit especially about the kind of glass which comprises a glass container, Soda-lime glass, borosilicate glass, lead glass, phosphate glass, aluminosilicate glass, etc. are mentioned.
Moreover, although it is preferable to use colorless and transparent glass as glass which comprises a glass container, it is also preferable to use colored transparent glass and colored translucent glass.
[0020]
In addition, when colorless and transparent glass is used, the color of the contents stored in the glass container can be fully recognized externally, and the color of the contents can be recognized vividly using internal reflection of light. Can do. On the other hand, when a colored transparent glass or a colored translucent glass is used, a glass container that is superior in decorativeness can be obtained by taking into account the color of the contents by utilizing internal reflection of light.
[0021]
2. Energized layer
(1) Configuration
(1) Continuous layer or discontinuous layer
As illustrated in FIGS. 1A and 1B, the energization processing layers 4 and 4 ′ may be continuous layers or discontinuous layers. For example, as shown in FIG. 1A, when the energization treatment layer 4 is a continuous layer, the surface resistivity value on the surface of the glass container 2 is more stable, and the electrostatic coating layer 6 having a uniform thickness. Can be formed stably. On the other hand, as illustrated in FIG. 1B, when the energization processing layer 4 ′ is a discontinuous layer, the surface irregularity of the energization processing layer 4 ′ is used, and the surface of the glass container 2 is electrostatically coated. An excellent adhesion can be obtained between the layer 6.
[0022]
(2) Surface resistivity
Further, the surface resistivity of the energization process layer (continuous layer portion) made of the energization process liquid is 1 × 10.^-Five~ 1x10^FiveA value within the range of Ω / □ is preferred.
This is because the surface resistivity of the energized layer is 1 × 10.^-FiveThis is because when the value is less than Ω / □, the type of surfactant that can be used may be excessively limited. On the other hand, the surface resistivity of the energized layer is 1 × 10.^FiveIf it exceeds Ω / □, the surface resistivity value on the surface of the glass container becomes unstable, and it may be difficult to stably form an electrostatic coating layer having a uniform thickness. .
Therefore, the surface resistivity of the energized layer is 1 × 10^-Four~ 1x10^FourMore preferably, the value is within the range of Ω / □.^-3~ 1x10^ThreeMore preferably, the value is within the range of Ω / □.
In addition, the surface resistivity of this electricity supply process layer can be measured based on the measuring method of JISK6911 (5.13).
[0023]
(1)-(3) Thickness
  In addition, the energization process layer (continuous layer part) of the energization process liquidThe thickness is set to a value within the range of 0.05 to 10 μm.
  This is because the thickness of the energization layer isLess than 0.05μmThis is because the value of the surface resistivity on the surface of the glass container becomes unstable, and it may be difficult to stably form an electrostatic coating layer having a uniform thickness. On the other hand, when the thickness of the energized layer exceeds 10 μm, it may take excessive time to form the energized layer or to dry the energized layer.
  Therefore, the thickness of the energized layer0.05The value is more preferably in the range of ˜5 μm, and further preferably in the range of 0.05 to 1 μm.
  Note that the thickness of the energization layer can be measured by a cross section including the glass container using an electron microscope, or can be measured using an optical film thickness meter.
[0024]
(2) Energizing treatment liquid
Although the electric current treatment liquid is an aqueous solution containing a surfactant, the amount of the surfactant added is in the range of 0.1 to 50% by weight with respect to the total amount of the electric current treatment liquid. It is preferable to use a value.
The reason for this is that when the amount of the surfactant added is less than 0.1% by weight, the surface resistivity value on the surface of the glass container becomes unstable, and an electrostatic coating layer having a uniform thickness is formed. This is because it may be difficult to form stably. On the other hand, when the added amount of the surfactant exceeds 50% by weight, the adhesion between the surface of the glass container and the electrostatic coating layer is remarkably reduced or excessively applied to the drying treatment of the energization treatment layer. This is because it may take time.
Therefore, it is more preferable that the addition amount of the surfactant is a value within the range of 0.5 to 20% by weight with respect to the total amount of the energization treatment liquid, and a value within the range of 1 to 10% by weight. More preferably.
[0025]
The solvent for dissolving the surfactant is preferably water, but it is more preferable to dissolve the surfactant once in an alcohol compound typified by isopropyl alcohol or ethyl alcohol and then add it to water. preferable.
The reason for this is that by using the alcohol compound together in this way, the surfactant can be dissolved quickly and the drying of the energization treatment liquid can be accelerated, and the surface of the glass container and the coating film This is because the adhesive strength of can be improved.
Therefore, for example, it is more preferable that the surfactant and the alcohol compound are uniformly mixed at a weight ratio of 20:80 to 80:20 and then added to water.
[0027]
Moreover, it is preferable to contain the surfactant which consists of a combination of a nonionic surfactant and a cationic surfactant as these surfactants.
The reason for this is that, in such a combination, the surface resistivity value on the surface of the glass container is made uniform by adding a relatively small amount of the surfactant to the energization treatment liquid, for example, about 7% by weight at maximum. This is because it can be done.
[0028]
As a combination of a more preferable nonionic surfactant and a cationic surfactant, ammonium chloride as a cationic surfactant is used with respect to 100 parts by weight of a polyoxyalkylene ether compound as a nonionic surfactant. Examples thereof include surfactants obtained by mixing 1 to 50 parts by weight of a system compound, an ammonium sulfate compound, or an ammonium nitrate compound.
[0029]
More preferable nonionic surfactants include polyoxyalkylene ether compounds, particularly oxyalkylene ether compounds represented by the following formula (1).
R1-O- (R2-O)_nH (1)
[In Formula (1), R1 is a C3-C15 alkyl group which may have a substituent, a C6-C15 aromatic hydrocarbon group which may have a substituent, or a substituent. A heteroaromatic cyclic group having 4 to 15 carbon atoms which may have a substituent (note that the substituent is an alkyl group having 1 to 20 carbon atoms, a halogen atom such as Br, Cl or I, or an aromatic group having 6 to 15 carbon atoms) Group hydrocarbon group, aralkyl group having 7 to 17 carbon atoms, alkoxy group having 1 to 20 carbon atoms, alkoxy-carbonyl group having 2 to 20 carbon atoms, and acyl group having 2 to 15 carbon atoms). R2 is an alkylene group having 1 to 100 carbon atoms which may have a substituent (in addition, examples of the substituent include an alkyl group having 1 to 20 carbon atoms and an aromatic hydrocarbon group having 6 to 15 carbon atoms). N) represents an integer of 1 to 100. ]
[0030]
Specific examples of such suitable polyoxyalkylene ether compounds include one or more of polyoxyethylene lauryl ether compounds, polyoxypropylene lauryl ether compounds, polyoxyethylene cetyl ethers, polyoxyethylene stearyl ethers, and the like. The combination of is mentioned.
The reason for this is that if the surfactant is such a compound, the surface resistance on the surface of the glass container can be increased by adding a small amount of the surfactant to the energizing solution, for example, by adding about 5% by weight or more of the surfactant. This is because the rate value can be made uniform.
[0031]
Further, the volume resistivity of the energization treatment liquid (aqueous solution state) is 1 × 10^-Four~ 1x10⁷The value is preferably within the range of Ω · cm.^-3~ 1x10⁶More preferably, the value is within the range of Ω · cm.^-2~ 1x10^FiveMore preferably, the value is within the range of Ω · cm.
This is because the value of the surface resistivity on the surface of the glass container can be easily uniformed by limiting the value of the volume resistivity to such a range.
[0032]
3. Electrostatic coating layer
(1) Configuration
Moreover, the thickness of the coating film made of the liquid paint is not particularly limited, but is preferably a value within a range of 5 to 200 μm, for example.
The reason for this is that when the thickness of the coating film is less than 5 μm, the mechanical strength is lowered and the film may be easily peeled off from the surface of the glass container. On the other hand, if the thickness of the coating film exceeds 200 μm, it may take too much time to form the coating film or to dry the coating film.
Therefore, the thickness of the coating film made of a liquid paint is more preferably set to a value within the range of 10 to 100 μm, and further preferably set to a value within the range of 20 to 50 μm.
[0033]
(2) Liquid paint
▲ 1 ▼ Type
The type of liquid paint used in electrostatic coating is not particularly limited. For example, from the group consisting of alkyd resin, epoxy resin, acrylic resin, vinyl resin, polyurethane resin, polyester resin, silicone resin, phenol resin, etc. It is preferably at least one resin selected.
In addition, these resins are used as a main component of curing, and as a curing agent, a mixture of an amino compound, a formaldehyde compound, a phenol compound, an isocyanate compound, a polyamide compound, a metal alkoxide compound, a metal chelate compound, or the like. More preferably it is used.
[0034]
(2) Curable resin
Moreover, it is preferable to use a thermosetting resin or an ultraviolet curable resin as a liquid paint used in electrostatic coating.
The reason for this is that, by using such a curable resin, the adhesion between the surface of the glass container and the coating film can be enhanced, and a coating film made of a thin film having excellent surface protection is formed. It is because it can do. In addition, when a thermosetting resin is used, a coating film can be easily formed using a heating furnace, and when an ultraviolet curable resin is used, it can be rapidly formed by ultraviolet irradiation. it can.
[0035]
(3) Viscosity
Moreover, it is preferable to make the viscosity (25 degreeC) of a liquid paint into the value within the range of 5-100,000 mPa * s.
This is because, when the viscosity of the liquid paint is less than 5 mPa · s, it may be difficult to handle or it may be difficult to increase the thickness of the coating film. On the other hand, if the viscosity of the liquid paint exceeds 100,000 mPa · s, it may be difficult to control the thickness of the coating film, or the electrostatic coating process itself may be difficult.
Therefore, the viscosity (25 ° C.) of the liquid paint is more preferably set to a value within the range of 10 to 10,000 mPa · s, and further preferably set to a value within the range of 100 to 5,000 mPa · s.
[0036]
[Second Embodiment]
  The second embodiment isAs in the first embodiment,A method for producing a coated glass container, in which an energized treatment layer that is a continuous layer or a discontinuous layer made of an energization treatment liquid and an electrostatic coating layer made of a liquid paint are sequentially formed on the surface of the glass container. ,
  A first step of forming an energization treatment layer by spraying an energization treatment liquid containing an atomized surfactant (hereinafter, sometimes referred to as an energization treatment step);
  A second step of forming the electrostatic coating layer by electrostatic coating of a liquid paint (hereinafter sometimes referred to as an electrostatic coating step);
  Is a method for producing a painted glass container.
That is, in 2nd Embodiment, the manufacturing method of the coating glass container of 1st Embodiment is demonstrated more concretely from the relationship of the energization processing apparatus, electrostatic coating apparatus, etc. which are used for it.
  FIG. 2 shows a flowchart of the manufacturing process of the coated glass container, STEP 2 in FIG. 2 shows the energization process, and STEP 4 shows the electrostatic coating process. The order of these STEPs is changed as appropriate. can do. For example, in FIG. 2, a drying process is provided as STEP 3 between STEP 2 and STEP 4. However, if the energization treatment liquid can be naturally dried easily, STEP 3 can be omitted. The inside STEP2 and STEP4 can be made into a continuous process.
[0037]
1. First process (energization process)
(1) Energization processing device
As the energization processing device used in the energization processing step, any generally known energization processing device can be suitably used. For example, the energization processing illustrated in FIGS. 3A and 3B is possible. The device 10 can be used. The energization processing apparatus 10 atomizes the energization processing liquid in the storage unit, guides the mist-shaped energization processing liquid having a predetermined particle size to the outlet of the mist chamber 61, and moves on the conveyor 69. By energizing the glass container, the energization process is performed uniformly.
Here, with reference to FIG. 4 (a) and (b), the principle which energizes with respect to a glass container is demonstrated in detail. That is, the atomized mist-like energization treatment liquid is ejected from the nozzle 81 and proceeds in the direction 91 of the arrow in the conduction path 99 in the mist chamber 61 while being agitated by the agitation air 83. The wall surface in the mist chamber 61 is provided with a baffle plate (mist rectifying plate) 85 having a semicircular or semi-elliptical cross-sectional shape, for example. When colliding with such a baffle plate 85 or a wall surface, it directly adheres to the baffle plate 85 or the like, drops into large particles, travels through an inclined portion 87 provided on the bottom surface, and is intensively discharged from the drain 89 to be stored. (Not shown).
On the other hand, the energization processing liquid having a predetermined particle diameter travels through the conduction path 99 without adhering to the baffle plate 85 or the wall surface of the mist chamber, and the mist blows out from the air blowing port 92 provided in the middle of the conduction path 99. It is guided to the mist outlet 97 by the feed air 93. And the mist of the energization process liquid which consists only of a predetermined particle size will be sprayed uniformly with respect to the glass container 8 which moves on a conveyor.
4A shows an example in which the energization processing liquid is sprayed from both sides of the glass container 8 flowing on the conveyor, but by spraying the energization processing liquid in this way, The energization treatment liquid can be uniformly attached.
[0038]
That is, by configuring the energization processing apparatus 10 in this way, when applying the energization processing liquid to the surface of the glass container, the atomized energization processing liquid having a large average particle diameter can be removed and reused. At the same time, it is possible to select and apply only a small particle energization treatment liquid having a relatively large surface area. Therefore, the atomized energization treatment liquid (mist) can uniformly adhere to the surface of the glass container, and the surface resistivity of the surface of the glass container can be stabilized.
In addition, since the average particle size of the atomized energization treatment liquid (mist) is relatively small, it can be naturally dried in the middle of conveyance on the surface of the glass container without providing a special drying step. Without being separately provided, or mild drying conditions can be employed. As a result, the energization process layer can be stably formed.
[0039]
(2) Application amount of energization treatment liquid
Also, the application amount (unit time) of the energization treatment liquid is 1 to 100 cm.^ThreeA value within the range of / min is preferable.
The reason is that the application amount of the energization treatment liquid is 1 cm.^ThreeIf it is less than / min, the value of the surface resistivity on the surface of the glass container becomes unstable, and it may be difficult to stably form an electrostatic coating layer having a uniform thickness. On the other hand, the application amount of the energization treatment liquid is 100 cm.^ThreeThis is because if the amount exceeds / min, the adhesion between the surface of the glass container and the electrostatic coating layer may be significantly reduced, or the energization treatment layer may take excessively long time to dry. .
Therefore, the application amount (unit time) of the energization treatment liquid is 10 to 70 cm.^ThreeMore preferably, the value is within the range of 20 minutes per minute.^ThreeMore preferably, the value is within the range of / min.
[0040]
(3) Average particle size of the energizing solution
Moreover, it is preferable to make the average particle diameter of the energization process liquid by an atomization process into the value below 100 micrometers.
The reason for this is that when the average particle size of the energization treatment liquid becomes a value of 100 μm or more, the surface resistivity value on the surface of the glass container becomes unstable, and the electrostatic coating layer having a uniform thickness is stabilized. This is because it may be difficult to form. In addition, when the average particle size of the energization treatment liquid becomes a value of 100 μm or more, it may be difficult to control the drying conditions in the drying process of the energization treatment liquid, or uneven coating may occur.
However, if the average particle size of the energization treatment liquid becomes excessively small, it takes excessive time to apply the energization treatment liquid to a predetermined thickness on the glass container, or the structure of the energization treatment apparatus. May become overly complex.
Therefore, it is more preferable to set the average particle size of the energization treatment liquid by the atomization process to a value within the range of 5 to 50 μm, and it is even more preferable to set the value within the range of 10 to 30 μm.
[0041]
Here, in FIG. 5 to FIG. 6, particle size distribution charts of the energization treatment liquid measured by a laser type particle size distribution meter are shown. FIG. 5 shows a particle size distribution chart of the energization processing liquid having a particle size within a predetermined range, and FIG. 6 shows a particle size distribution chart of the energization processing liquid partially including a particle size exceeding the predetermined range. Also, the left vertical axis shows the frequency (%) of the specific particle diameter in the total amount, and the right vertical axis shows the cumulative (%) of the particle diameter frequency.
When the energization treatment is performed on the glass container using the energization treatment liquid having the particle size distribution chart as shown in FIG. 5, there is no uneven application of the energization treatment liquid, and the uniform thickness. It has been confirmed that an electrostatic coating layer can be formed efficiently. On the other hand, when the energization treatment is performed using the energization treatment liquid having the particle size distribution chart as shown in FIG. 6, uneven application of the energization treatment liquid occurs and the thickness of the formed electrostatic coating layer is reduced. It has also been found that there is a large amount of variation, and that the amount of energized treatment liquid recovered is large.
Therefore, in order to efficiently form an electrostatic coating layer having a uniform thickness, it can be said that the average particle size of the energization treatment liquid is preferably less than 100 μm in consideration of the particle size distribution.
The average particle size of the energization treatment liquid can be easily measured by using a laser type particle counter or an infrared type particle size distribution meter.
[0042]
(4) Drying process of energizing solution
Moreover, it is preferable to provide a drying process (STEP 3) of the energization treatment liquid as shown in FIG. 2 before performing the electrostatic coating process. That is, this is for removing moisture and the like contained in the energization treatment liquid and controlling the surface resistivity of the energization treatment layer to a value within a predetermined range.
Therefore, a drying process of the energization treatment liquid is provided, and dry air is blown against the energized glass container, the glass container is rotated, the glass container is heated to a temperature of 30 to 100 ° C., and the pressure is reduced. It is preferable to pass through the chamber and make it a reduced pressure state.
However, as described above, by controlling the average particle size of the energization treatment liquid by the atomization treatment to a value of, for example, less than 100 μm, the energization treatment is also performed by natural drying without providing a separate drying step for the energization treatment liquid. Water and the like contained in the liquid can be removed, and as a result, the surface resistivity of the energized layer can be sufficiently controlled to a value within a predetermined range.
[0043]
2. Second process (electrostatic coating process)
(1) Electrostatic coating equipment
As an electrostatic coating apparatus used in the electrostatic coating process, a generally known electrostatic coating apparatus (painting gun) can be preferably used. For example, a static coating apparatus illustrated in FIG. The electrocoating device 100 can typically be used.
That is, a coating gun 100 as an electrostatic coating apparatus includes a coating spray hole 115 provided at a tip portion thereof, a high voltage applying unit 103 in which an electrode 112 for applying a high voltage to a liquid coating is projected, a liquid It is preferable to include two air injection holes 107 and 108 for supplying air when spraying the paint.
In addition, the main body 101 of the coating gun 100 is supplied from a liquid paint storage unit (not shown) to the high voltage supply unit 110 for energizing the high voltage application unit 103 and the paint injection hole 115. It is preferable to include a paint supply path 104 for supplying the air and an air supply path (not shown) for supplying compressed air to the two air injection holes 107 and 108.
[0044]
Further, as a coating gun as an electrostatic coating apparatus, it is preferable that the coating material injection hole 115 is a rotary head as shown in FIG. 8 so that the liquid coating material can be sprayed uniformly. That is, the rotating head 115 of the coating gun 100 ′ rotates around the rotation axis by the injection force of the air blown from the air injection hole 108, and the paint injected from the paint injection hole 115 by the centrifugal force generated thereby is glass. The container 8 can be sprayed uniformly.
In order to reduce the size of the paint gun, it is also preferable that a part 120 of the paint supply path 104 is formed in a coil shape and accommodated near the tip of the paint gun 100 'as shown in FIG. . Thus, by making the fuel supply path 104 into a coil shape, it is possible to prevent dielectric breakdown and short circuit due to the low resistance of the paint, and to make the paint gun as a compact design as a whole.
[0045]
(2) Distance
Moreover, it is preferable to make the distance between a 1st process and a 2nd process into the value within the range of 0.5-20 m.
The reason for this is that if the distance between the first step and the second step is less than 0.5 m, the atomization conditions of the energization treatment liquid are controlled and the average particle size is reduced. This is because the energization treatment liquid becomes insufficiently dried and the adhesion between the surface of the glass container and the coating film may be reduced.
On the other hand, if the distance between the first process and the second process exceeds 20 m, the restrictions on the installation locations of the first process and the second process become excessively large, This is because the space for the manufacturing process may become excessively large.
Therefore, the distance between the first step and the second step is more preferably set to a value within the range of 1 to 10 m, and further preferably set to a value within the range of 2 to 5 m.
[0046]
【Example】
The contents of the present invention will be described in more detail with reference to the following examples. However, the technical scope of the present invention is not limited to the description of only these examples, and can be appropriately changed within the scope of the object of the present invention.
[0047]
[ Reference example 1 ]
1. Manufacture of painted glass containers
(1) Energization process
  A glass container (bottleneck type glass bottle) having a height of 10 cm was prepared and placed on an energization processing line.
  Next, using the energization processing apparatus as shown in FIG. 4, the energization process was performed on the surface of the glass container under the following conditions.
(1) -1Electrical treatment liquid: Acrylic ether 5% by weight aqueous solution
              (Polyoxyethylene lauryl ether)
(1) -2Atomization pressure: 0.7 MPa
(1) -3Pattern pressure: 0.7 MPa
(1) -4Application amount: 60cm^Three/ Min
[0048]
(2) Electrostatic coating process
Next, an electrostatic coating film was formed on the surface of the glass container using the electrostatic coating apparatus as shown in FIG. 7 under the following conditions.
(1) Liquid paint: Color clear resin (acrylic melamine resin)
(2) Viscosity: 100 mPa · s
(3) Application amount: 60cm^Three/ Min
(4) Voltage: 12kv
[0049]
2. Evaluation of painted glass containers
(1) Appearance of the coating film
The thickness of the coating film formed on the surface of the coated glass container (10 pieces) was measured using a film thickness meter, and the appearance of the coating film was evaluated according to the following criteria.
A: Variation is within ± 10% of the average value.
○: Variation is within ± 20% of the average value.
Δ: Variation is within ± 30% of the average value.
X: Variation is a value exceeding ± 30% of the average value.
[0050]
(2) Coating strength
The coating film strength formed on the surface of the coated glass container (10 pieces) was measured by a grid pattern method, and the coating film strength was evaluated according to the following criteria.
A: The average number of peeling is 0 to 1 / 100th grid.
○: The average number of peeling is 2 to 5 pieces / 100th grid.
Δ: The average number of peeling is 6 to 10 pieces / 100th grid.
X: The average number of peeling is 11 or more / 100th grid.
[0051]
(3) Production efficiency (liquid paint consumption)
When forming a coating film on the surface of a coated glass container (1000 pieces), the amount of liquid paint required was measured, and production efficiency was evaluated according to the following criteria.
(Double-circle): The average coating-material usage is 2 g / piece or less.
A: The average paint usage is 3 g / book or less.
(Triangle | delta): The average coating-material usage-amount is 4 g / piece or less.
X: The average paint usage is a value exceeding 4 g / piece.
[0052]
[ Reference Examples 2-12 ]
  Reference Examples 2-12Then, the surfactant in the energization treatment liquid was changed from the alkyl ether compound (polyoxyethylene lauryl ether) of Example 1 to the compounds shown in Table 1 (12 types),Reference example 1A coated glass container was prepared and evaluated in the same manner as described above.
  As a result, as a surfactant, a nonionic surfactant(Reference Examples 2-3)And cationic surfactants(Reference Examples 7-9)It has been found that relatively good balance characteristics can be obtained in terms of the appearance of the coating film, the adhesion of the coating film, and the production efficiency.
[0053]
[Examples 14 to 16]
  In Examples 2 to 16, except that the type of surfactant in the energization treatment liquid was changed to a combination of two types of surfactant as shown in Table 2,Reference example 1A coated glass container was prepared and evaluated in the same manner as described above.
  As a result, when a nonionic surfactant and a cationic surfactant are combined as a surfactant (Example 15), the coating film appearance, coating film adhesion and production efficiency are further improved. It was found that balance characteristics can be obtained.
[0054]
[Examples 17 to 19]
  In Examples 17 to 19, except that the addition amount of the surfactant in the energization treatment liquid was changed as shown in Table 3,Reference Example 1 andSimilarly, a coated glass container was prepared and evaluated.
  As a result, when a surfactant is added as a nonionic surfactant at around 5% by weight and a cationic surfactant is added at about 0.5 to 2% by weight, the appearance of the coating film, the adhesion of the coating film, and the production It has been found that better balance characteristics can be obtained in terms of efficiency.
[0055]
[Comparative Example 1]
In Comparative Example 1, a coated glass container was prepared and evaluated in the same manner as in Example 1 except that the energization process step was not provided and the energization process layer was not formed.
[0056]
[Comparative Example 2]
In Comparative Example 2, a coated glass container was prepared and evaluated in the same manner as in Example 1 except that the surfactant was not added to the energization treatment liquid.
[0057]
[Comparative Example 3]
In Comparative Example 3, a coated glass container was prepared and evaluated in the same manner as in Example 1 except that a conductive resin (polyacrylic acid type cation material) was added in the energization treatment solution instead of the surfactant. .
[0058]
[Table 1]

[0059]
[Table 2]

[0060]
[Table 3]

[0061]
【The invention's effect】
  Painted glass container of the present inventionManufacturing methodAccording to the present invention, a coated glass container having an electrostatic coating layer having a uniform thickness is provided on the surface of the glass container by providing an energization process layer which is a continuous layer or a discontinuous layer made of an energization process liquid containing a surfactant. Can be easily obtained.
  Moreover, according to the manufacturing method of the coated glass container of the present invention, by including a step of providing an energization treatment layer that is a continuous layer or a discontinuous layer made of an energization treatment liquid containing a surfactant on the surface of the glass container, A coated glass container having an electrostatic coating layer having a uniform thickness can be efficiently obtained.
[Brief description of the drawings]
FIG. 1 is a schematic view of a painted glass container of the present invention.
FIG. 2 is a view showing a flowchart in the method for producing a coated glass container of the present invention.
FIG. 3 is a schematic view of an energization processing apparatus used in the method for manufacturing a coated glass container of the present invention.
FIG. 4 is a diagram for explaining a mechanism of energization processing;
FIG. 5 is a view showing a particle size distribution chart of an energization treatment liquid (No. 1).
FIG. 6 is a view showing a particle size distribution chart of the energization processing liquid (part 2).
FIG. 7 is a schematic view of an electrostatic coating apparatus used in the method for manufacturing a coated glass container of the present invention.
FIG. 8 is a schematic view of another electrostatic coating apparatus used in the method for manufacturing a coated glass container of the present invention.
[Explanation of symbols]
8: Glass container
10: Electrostatic coating equipment
61: Mist chamber
83: Stir air
85: Baffle plate (mist rectifying plate)
100: Electrostatic coating device (painting gun)
106: High voltage application unit
108: Air injection hole
112: Electrode
115: Paint injection hole

Claims (5)

In the method of manufacturing a coated glass container, in which a continuous layer or a discontinuous layer made of an energization treatment liquid and an electrostatic coating layer made of a liquid paint are sequentially formed on the surface of the glass container,
It contains a surfactant composed of a combination of a polyoxyalkylene ether compound represented by the following formula (1) as an atomized nonionic surfactant and a cationic surfactant , and has a volume resistivity of 1 × By spraying an energization treatment liquid having a value in the range of 10 ⁻⁴ to 1 × 10 ⁷ Ω · cm , the thickness is in the range of 0.05 to 10 μm and the surface resistivity is 1 ×. A first step of forming an energization treatment layer having a value within a range of 10 ⁻⁵ to 1 × 10 ⁵ Ω / □ ;
A second step of forming the electrostatic coating layer by electrostatic coating of a liquid paint;
The manufacturing method of the coated glass container characterized by including.
R1-O- (R2-O) n H (1)
[In Formula (1), R1 represents an alkyl group having 3 to 15 carbon atoms which may have a substituent, and R2 represents an alkylene group having 1 to 100 carbon atoms which may have a substituent. , N represents an integer of 1-100. ] 2. The method for producing a coated glass container according to claim 1, wherein a coating amount per unit time of the energization treatment liquid is set to a value within a range of 1 to 100 cm ³ / min. The method for producing a coated glass container according to claim 1 or 2, wherein an average particle diameter by atomization of the energization treatment liquid is set to a value less than 100 µm. After implementing the said 1st process, the said electricity supply process liquid is naturally dried on a conveyance path, and then implement | achieves the said 2nd process, As described in any one of Claims 1-3 characterized by the above-mentioned. A method of manufacturing a painted glass container. The distance between the said 1st process and the said 2nd process shall be the value within the range of 0.5-20m, The painted glass as described in any one of Claims 1-4 characterized by the above-mentioned. Container manufacturing method.

Images