WO2018207858A1 - Insulating printing ink for light shielding and insulating member - Google Patents

Insulating printing ink for light shielding and insulating member Download PDF

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Publication number
WO2018207858A1
WO2018207858A1 PCT/JP2018/018062 JP2018018062W WO2018207858A1 WO 2018207858 A1 WO2018207858 A1 WO 2018207858A1 JP 2018018062 W JP2018018062 W JP 2018018062W WO 2018207858 A1 WO2018207858 A1 WO 2018207858A1
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WO
WIPO (PCT)
Prior art keywords
resin
printing ink
bamboo charcoal
insulating
insulating light
Prior art date
Application number
PCT/JP2018/018062
Other languages
French (fr)
Japanese (ja)
Inventor
典敬 唐木
Original Assignee
株式会社セイコーアドバンス
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社セイコーアドバンス filed Critical 株式会社セイコーアドバンス
Priority to CN201880004831.2A priority Critical patent/CN110036078B/en
Priority to KR1020197004536A priority patent/KR102202479B1/en
Publication of WO2018207858A1 publication Critical patent/WO2018207858A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/34—Printing on other surfaces than ordinary paper on glass or ceramic surfaces
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes

Definitions

  • the present invention relates to an insulating light-shielding printing ink and an insulating member.
  • Patent Document 1 discloses a technique related to carbon black whose surface is coated with a resin.
  • Patent Document 2 discloses a technique relating to an ink that can be added to a food containing carbon powder having a specific particle size.
  • Patent Document 2 is intended to be added to food, and has not been focused on the use of electronic devices.
  • usable materials are limited, for example, on the premise that a special binder resin to which food can be added is used.
  • the present inventor has found for the first time that high concealment and high insulation can be achieved by using bamboo charcoal.
  • the charcoal derived from plants such as charcoal and bamboo charcoal, and charcoal derived from other organic substances have different energization characteristics depending on conditions such as the firing temperature. Therefore, the present inventor has studied from the viewpoint of developing an ink that can stably obtain high insulation, and has focused on the unique structure of bamboo charcoal, not the current-carrying characteristics of bamboo charcoal itself.
  • bamboo charcoal while discovering that the insulation derived from the binder resin is effectively and stably obtained by covering the entire surface and inner surface derived from the unique structure of the bamboo charcoal contained in the ink with the binder resin, the bamboo charcoal However, it was found that it is easier to adapt to the binder resin than other charcoal and that a good coating can be obtained. In addition, by using bamboo charcoal, while obtaining high hiding properties, by combining this with a binder resin, an ink that achieves both high hiding properties and high insulating properties was realized for the first time.
  • the present invention provides an insulating light-shielding printing ink containing bamboo charcoal and a binder resin.
  • the present invention also provides an insulating member comprising a base material and a coating film formed of the insulating light-shielding printing ink formed on the base material.
  • the insulating light-shielding printing ink of the present invention contains bamboo charcoal and a binder resin.
  • bamboo charcoal functions as black ink and is obtained after firing bamboo.
  • bamboo is an environmentally friendly material from the viewpoint of being easy to obtain, inexpensive and recycling resources.
  • Examples of the bamboo generally include true bamboo, bean bamboo, beech bamboo, cloth bag bamboo, black bamboo, female bamboo, medaka bamboo, and pale bamboo. These may be used individually by 1 type, and 2 or more types may be mixed and used for them.
  • Examples of the method for firing bamboo include known methods, such as a method of firing in a charcoal kiln or a method of mechanically firing using a carbonization furnace using a material such as stainless steel.
  • the method of mechanically baking using a carbonization furnace includes a method of performing heat treatment in an oxygen-free atmosphere using heated steam. The firing conditions are 400 to 1000 ° C.
  • bamboo charcoal generally produces more fine holes than charcoal and the like.
  • Such fine pores are macro tubes in which temporary conduits for sucking up bamboo nutrients and moisture etc. are carbonized and finer micro tubes existing on the inner wall thereof are arranged without gaps, so-called honeycomb structure and It has become.
  • bamboo has a fiber structure that is aligned in the vertical direction and is linear, such fine holes are also easily aligned with each other.
  • the average pore diameter of the macro tube is approximately 10 to 40 ⁇ m, and the average pore diameter of the micro tube is approximately 1 to 5 nm.
  • bamboo contains a relatively large amount of silicic acid and potassium, and these have the property of solidifying into glass when fired into bamboo charcoal. For this reason, bamboo charcoal is generally considered to contain more glassy substances than charcoal and the like.
  • the specific surface area of bamboo charcoal is preferably 100 m 2 / g or more, more preferably 200 m 2 / g or more, for example, as a calculated value using a BET multipoint method by nitrogen adsorption.
  • the specific surface area of bamboo charcoal is preferably 1,000 m 2 / g or less, more preferably 500 m 2 / g or less. Thereby, concealment property can be improved.
  • the specific surface area of bamboo charcoal can be measured according to JIS Z8830.
  • the 50% particle diameter (D50) of bamboo charcoal is preferably 0.05 ⁇ m or more, more preferably 1 ⁇ m or more, and even more preferably 2.5 ⁇ m. Thereby, appropriate dispersibility can be obtained.
  • the 50% particle size (D50) of bamboo charcoal is preferably 10 ⁇ m or less, more preferably 8.0 ⁇ m or less, and even more preferably 5.0 ⁇ m or less. Thereby, concealability can be improved, forming a suitable coating film.
  • the 90% particle diameter (D90) of bamboo charcoal is preferably 20 ⁇ m or less, and more preferably 10 ⁇ m or less.
  • the measurement of 50% particle diameter (D50) and 90% particle diameter (D90) of bamboo charcoal can be obtained by measuring the particle size distribution on a volume basis by, for example, a laser diffraction / scattering method.
  • the content of bamboo charcoal is preferably 40 parts by mass or more, and more preferably 70 parts by mass or more with respect to 100 parts by mass of the solid content in the insulating light-shielding printing ink. Thereby, insulating property can also be improved, improving a concealing property, maintaining a printing characteristic.
  • the bamboo charcoal content is preferably 90 parts by mass or less, more preferably 80 parts by mass or less, with respect to 100 parts by mass of the solid content in the insulating light-shielding printing ink. Thereby, moderate fluidity
  • bamboo charcoal may be obtained by physically or chemically treating the surface from the viewpoint of making ink characteristics suitable.
  • the binder resin is used to disperse bamboo charcoal and form a printed coating film.
  • the binder resin may be any resin that is chemically organically synthesized, and various resins can be used.
  • a binder resin a vinyl chloride-vinyl acetate copolymer resin (also referred to as a “vinyl chloride resin” in this specification) is used from the viewpoint of improving compatibility with bamboo charcoal and achieving both high insulation and hiding properties at a higher level.
  • Acrylic resin polyester resin, epoxy resin, polycarbonate resin, polyolefin resin, synthetic rubber, cellulose resin, maleic acid resin, phenol resin, polyurethane resin, polyamide resin, polyimide resin, melamine resin, phenoxy resin, and active energy ray curable type It is preferable that it is 1 type, or 2 or more types chosen from resin, these modified products, and the modified product of natural resin.
  • a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, a polyester resin or an epoxy resin, or a modified product thereof is more preferable, and a polyester resin is more preferable.
  • the content of the binder resin is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and preferably 150 parts by mass or less, more preferably 120 parts by mass with respect to 100 parts by mass of bamboo charcoal. It is as follows. By setting it to the above lower limit value or more, good printing characteristics can be obtained. On the other hand, by setting it to the upper limit value or less, both insulation and concealment can be achieved at a higher level.
  • the insulating light-shielding printing ink of the present invention includes both bamboo charcoal and a binder resin, so that both insulating properties and concealing properties can be achieved.
  • bamboo charcoal generally has more fine holes than charcoal, and has a structure in which fine holes called a honeycomb structure are arranged without gaps. Therefore, the binder resin can enter the vicinity of the entrance of such fine holes or the inside of the holes.
  • bamboo charcoal generally contains more glassy substances than charcoal, it is considered that wetting with the binder resin is better than charcoal.
  • the binder resin is coated with bamboo charcoal, and even if the blending amount of bamboo charcoal is increased to improve the concealing property, the decrease in resistance value can be suppressed, so that it is presumed that both insulating properties and concealing properties can be achieved. Furthermore, the insulating light-shielding printing ink of the present invention obtains good insulation because bamboo charcoal is coated with the binder resin as described above even when bamboo charcoal having a relatively high conductivity is used. be able to.
  • the insulating light-shielding printing ink of the present invention can satisfy both the insulating property and the concealing property at a higher level by satisfying the following conditions.
  • the reason for this is not clear, but the present inventor has been researching insulating light-shielding printing ink using bamboo charcoal, and controls the optical density (OD) value under the above conditions within a specific range. However, it has been found that it is effective as an index for realizing both concealability and insulation suitable for the use of the insulating light-shielding printing ink.
  • the insulating light-shielding printing ink of the present invention is applied onto a glass substrate by pulling at a moving speed of 50 mm / sec using a bar coater (manufactured by RK Print Coat Instruments Ltd., bar No. 2) having a wire diameter of 6 mils.
  • the optical density (OD) value of the obtained coating film is preferably 1.0 or more and 7.0 or less.
  • the coating film is obtained after drying at 80 ° C. for 60 minutes.
  • the optical density (OD) value of the coating film is more preferably 3.5 or more from the viewpoint of obtaining concealability.
  • the optical density (OD) value of the coating film is more preferably 6.0 or less from the viewpoint of obtaining good ink fluidity, printing characteristics, adhesion, and the like.
  • the type of binder resin depending on the firing temperature, average particle diameter, specific surface area, etc. of bamboo charcoal it can be obtained for the first time by controlling the blending ratio of bamboo charcoal and binder resin, the degree of dispersion of bamboo charcoal with respect to the binder resin, and the like. Further, the degree of dispersion is controlled by selecting the strength of shearing force and the number of treatments in the dispersing device, for example, according to the combination of bamboo charcoal and binder resin.
  • the OD value is a numerical value representing the light transmittance (T%) in logarithm. In general, the higher the OD value, the lower the light transmittance.
  • the OD value can be measured using, for example, a transmission densitometer “Model 341C” (manufactured by X-Rite).
  • the insulating light-shielding printing ink of the present invention may further contain a pigment other than bamboo charcoal as long as the effects of the present invention are not impaired.
  • the content of bamboo charcoal with respect to the total pigment is preferably 50% by mass or more, more preferably 80% by mass or more, and may be 100% by mass from the viewpoint of obtaining high insulation.
  • the insulating light-shielding printing ink of the present invention may contain a known ink additive component.
  • Known ink additives include, for example, stabilizers such as solvents, antioxidants, leveling agents, antifoaming agents, thickeners, antisettling agents, wetting and dispersing agents, antistatic agents, antifogging agents and the like. Examples include activators, waxes, slip agents, coupling agents, silane coupling agents, various additives such as near infrared absorbers, and the like.
  • the solvent examples include mineral spirits, toluene, xylene, hydrocarbons such as aromatic hydrocarbons having 8 to 11 carbon atoms; ethyl acetate, n-butyl acetate, isobutyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl Esters such as ether acetate, butyl carbitol acetate, and dibasic acid esters; ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, and diethylene glycol; ketones such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, and isophorone Methanol, ethanol, isopropanol, n-butanol, isobutanol, diacetone alcohol, 3-methyl-3-methoxybutanol How alcohol, and the like. These solvents may be used
  • the insulating light-shielding printing ink is formed by mixing bamboo charcoal and a binder resin by a known method.
  • an ink can be obtained by adding bamboo charcoal to a resin binder and dispersing it using an appropriate dispersing device.
  • the linear pressure per roll length is 20 N / mm to 60 N / mm. It is preferable to set the number of treatments (number of passes) to 2 or more after setting and applying an appropriate shearing force.
  • the insulating light-shielding printing ink of the present invention is particularly suitable for applications such as protection panel printing with a touch function provided in electronic devices such as smartphones, tablet computers, car navigation systems, and intercoms that require light-shielding properties. It is. According to the insulating light-shielding printing ink of the present invention, in such applications, the electronic device malfunctions while obtaining high concealment such as shielding the backlight in the electronic device or concealing the electrode wiring inside the electronic device. Can be prevented.
  • the insulating member of the present invention includes a base material and a coating film formed of the above-described insulating light-shielding printing ink formed on the base material.
  • the substrate is not particularly limited, but is selected from polyester, polyamide, polycarbonate, acrylic, polyurethane, polyolefin, quartz glass, soda lime glass, alkali-free glass, sapphire glass, chemically tempered glass, and composite materials thereof. Or what is formed using 2 or more types as a material is mentioned.
  • the base material formed from these materials has a surface that has been subjected to anti-fogging treatment, strengthening treatment, antireflection treatment, heat ray cutting treatment, coloring treatment, or ITO (indium tin oxide) conductive film treatment. May be.
  • the shape of a base material is not specifically limited.
  • the method for forming the coating film is not particularly limited, and a known method can be used.
  • the thickness of the coating film is, for example, 3 to 200 ⁇ m.
  • Examples of the insulating member include a protection panel with a touch function of an electronic device as described above.
  • the insulating member may have a single layer or other multilayers between the base material and the coating layer made of the above-described insulating light-shielding printing ink. Moreover, you may have two or more coating-film layers by said insulating light-shielding printing ink. For example, a plurality of coating layers of white ink may be stacked on a substrate, and a coating layer of the above-described insulating light-shielding printing ink may be stacked thereon.
  • the method for using bamboo charcoal of the present invention is to use bamboo charcoal as the above-described insulating light-shielding printing ink. As a result, it is possible to provide an environmentally friendly ink using circulating resources that can achieve both insulation and concealment.
  • Binder resin The binder resins used in Examples and Comparative Examples are as shown in Table 3 below.
  • Examples 1 to 11 An organic solvent (Isophorone, manufactured by Evonik Industries) and bamboo charcoal were added to the binder resin so as to have the composition (parts by mass) shown in Table 4, and premixing was performed with a rotary blade type small stirrer. Thereafter, using a three-roll mill dispersing device (Bueller Co., Ltd., SDY-200 type), the linear pressure per roll length was set to 40 N / mm and dispersed under the condition that the number of passes was two times to obtain ink. .
  • a three-roll mill dispersing device Bueller Co., Ltd., SDY-200 type
  • Insulating property measurement of resistance value ( ⁇ )
  • the ink was drawn at a moving speed of 50 mm / second using a bar coater (manufactured by RK Print Coat Instruments Ltd., bar No. 2) having a wire diameter of 6 mil, and a glass substrate. It was applied on top and dried at 80 ° C. for 60 minutes to form a coating film.
  • a super insulation meter “model SM-21E” manufactured by Toa Denpa Kogyo Co., Ltd.
  • the measurement voltage was 1 kv
  • measurements were taken at three locations, and the average value was taken.
  • the measurement range when the measurement voltage was 1 kv was 1.0 ⁇ 10 6 ⁇ to 2.0 ⁇ 10 13 ⁇ .
  • Concealing property visual sensory evaluation Ink was applied onto a glass substrate by pulling at a moving speed of 50 mm / sec using a bar coater (manufactured by RK Print Coat Instruments Ltd., bar No. 2) having a wire diameter of 6 mil. And dried at 80 ° C. for 60 minutes to form a coating film and obtain a printed matter. Fluorescent lamp light is applied from the printed surface side (coating surface side) of the obtained printed matter, and the concealment of the fluorescent lamp light viewed from the glass substrate side is performed by a skilled expert in a four-step evaluation. It was. A: The light from the fluorescent lamp is not transmitted at all. ⁇ : The light from the fluorescent lamp is slightly transmitted. (Triangle

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Wood Science & Technology (AREA)
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  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Inorganic Insulating Materials (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

This insulating printing ink for light shielding contains bamboo charcoal and a binder resin.

Description

絶縁性遮光用印刷インキおよび絶縁性部材Insulating light shielding printing ink and insulating member
　本発明は、絶縁性遮光用印刷インキおよび絶縁性部材に関する。 The present invention relates to an insulating light-shielding printing ink and an insulating member.
　従来、インキには、印刷性に加え、様々な性能が要求されている。なかでも電子機器の分野においては、遮光用途に加え、絶縁性である黒色インキが求められている。かかる黒色インキとしては、一般的に、カーボンブラックや酸化鉄が用いられている。
　しかしながら、カーボンブラックを電子機器の分野において用いようとした場合、カーボンブラックは導電性を有するため、充分な抵抗値が得られないといった問題があった。すなわち、カーボンブラックは、その配合量を高めれば遮光効果が得られるものの、導電性が高くなる結果、絶縁性が低下するものであった。言い換えると、絶縁性と隠蔽性はトレードオフの関係にあった。かかる問題を解決する技術として、特許文献１には、表面が樹脂で被覆されたカーボンブラックに関する技術が開示されている。 Conventionally, inks are required to have various performances in addition to printability. In particular, in the field of electronic equipment, in addition to light shielding applications, insulating black ink is required. As such black ink, carbon black or iron oxide is generally used.
However, when carbon black is used in the field of electronic equipment, there is a problem that a sufficient resistance value cannot be obtained because carbon black has conductivity. That is, the carbon black has a light shielding effect if its blending amount is increased, but the conductivity is increased, resulting in a decrease in insulation. In other words, there was a trade-off between insulation and concealment. As a technique for solving such a problem, Patent Document 1 discloses a technique related to carbon black whose surface is coated with a resin.
　一方、環境保護の観点から、カーボンブラックや酸化鉄に替わる新しいインキ材料が求められている。環境に優しいインキ材料として、例えば、特許文献２には、特定の粒子径の炭素粉末を含む食品に添加可能なインキに関する技術が開示されている。 On the other hand, from the viewpoint of environmental protection, there is a demand for new ink materials that can replace carbon black and iron oxide. As an environmentally friendly ink material, for example, Patent Document 2 discloses a technique relating to an ink that can be added to a food containing carbon powder having a specific particle size.
特開２００１－２０７０７９号公報JP 2001-207079 A 特開２００８－１７９７３７号公報JP 2008-179737 A
　しかしながら、特許文献２に開示された技術は、食品に添加することを目的とするものであり、電子機器の用途に着目したものではなかった。また食品としての安全性を確保する観点から、食品添加可能な特殊なバインダー樹脂を用いることを前提とする等、使用できる材料も限られていた。 However, the technique disclosed in Patent Document 2 is intended to be added to food, and has not been focused on the use of electronic devices. In addition, from the viewpoint of ensuring safety as a food, usable materials are limited, for example, on the premise that a special binder resin to which food can be added is used.
　本発明者は、従来のカーボンブラックに替わる環境に優しい電子機器用インキを開発すべく鋭意検討を行った結果、竹炭を用いることにより、高隠蔽性および高絶縁性を両立できることを初めて見出した。
　ここで、一般に、木炭や竹炭等の植物由来の炭、およびその他の有機物由来の炭は、その焼成温度等の条件により、得られる通電特性が変化するものであった。
　そこで、本発明者は、安定的に高絶縁性が得られるインキを開発する観点から検討し、竹炭そのものが有する通電特性ではなく、竹炭の特有の構造に着目した。そして、インキに含まれる竹炭の特有の構造に由来する表面及び内表面全体がバインダー樹脂により覆われることによって、バインダー樹脂がもつ絶縁性が効果的かつ安定的に得られることを知見するとともに、竹炭が、他の木炭よりもバインダー樹脂になじみやすく、良好な被覆が得られることを知見した。そして、竹炭を用いることで高隠蔽性を得つつも、これにバインダー樹脂を組み合わせることによって、高隠蔽性と高絶縁性を両立できるインキを初めて実現させた。 As a result of intensive studies to develop an environment-friendly ink for electronic equipment that replaces the conventional carbon black, the present inventor has found for the first time that high concealment and high insulation can be achieved by using bamboo charcoal.
Here, generally, the charcoal derived from plants such as charcoal and bamboo charcoal, and charcoal derived from other organic substances have different energization characteristics depending on conditions such as the firing temperature.
Therefore, the present inventor has studied from the viewpoint of developing an ink that can stably obtain high insulation, and has focused on the unique structure of bamboo charcoal, not the current-carrying characteristics of bamboo charcoal itself. And while discovering that the insulation derived from the binder resin is effectively and stably obtained by covering the entire surface and inner surface derived from the unique structure of the bamboo charcoal contained in the ink with the binder resin, the bamboo charcoal However, it was found that it is easier to adapt to the binder resin than other charcoal and that a good coating can be obtained. In addition, by using bamboo charcoal, while obtaining high hiding properties, by combining this with a binder resin, an ink that achieves both high hiding properties and high insulating properties was realized for the first time.
　本発明は、竹炭と、バインダー樹脂とを含む絶縁性遮光用印刷インキを提供する。 The present invention provides an insulating light-shielding printing ink containing bamboo charcoal and a binder resin.
　また、本発明は、基材と、前記基材上に形成された上記絶縁性遮光用印刷インキによる塗布膜と、を備える絶縁性部材を提供する。 The present invention also provides an insulating member comprising a base material and a coating film formed of the insulating light-shielding printing ink formed on the base material.
　本発明によれば、高絶縁性と高隠蔽性を両立できる、環境に優しい絶縁性遮光用印刷インキを提供できる。 According to the present invention, it is possible to provide an environment-friendly insulating light-shielding printing ink that can achieve both high insulation and high concealment.
＜絶縁性遮光用印刷インキ＞
　以下、本発明の実施形態について、詳細に説明する。 <Insulating light shielding printing ink>
Hereinafter, embodiments of the present invention will be described in detail.
　本発明の絶縁性遮光用印刷インキは、竹炭と、バインダー樹脂とを含む。 The insulating light-shielding printing ink of the present invention contains bamboo charcoal and a binder resin.
　竹炭は、黒色インキとして機能するものであり、竹を焼成したのちに得られる炭である。
　竹は、入手しやすく安価でありかつ循環型資源という観点から環境に優しい資材である。竹としては、例えば、一般に、真竹、淡竹（ハチク）、孟宗竹、布袋竹、黒竹、雌竹（メダケ）、根曲竹および淡竹等が挙げられる。これらは、一種を単独で用いてもよく、二種以上を混合して用いてもよい。
　竹の焼成方法は、公知の方法が挙げられ、炭窯で焼く方法、またはステンレス等の材質を使用した炭化炉を使って機械的に焼く方法等が挙げられる。なお、炭化炉を使って機械的に焼く方法には、加熱水蒸気を用いて無酸素雰囲気下で加熱処理する方法も含まれる。また焼成条件は、炭窯で焼く場合には４００～１０００℃で数日～１週間程度、また炭化炉を使って機械的に焼く場合には、例えば４００～１０００℃で６～８時間程度かけて行われる。ただし加熱水蒸気にて加熱処理する場合には１５分～１時間程度の短時間で行われることがある。 Bamboo charcoal functions as black ink and is obtained after firing bamboo.
Bamboo is an environmentally friendly material from the viewpoint of being easy to obtain, inexpensive and recycling resources. Examples of the bamboo generally include true bamboo, bean bamboo, beech bamboo, cloth bag bamboo, black bamboo, female bamboo, medaka bamboo, and pale bamboo. These may be used individually by 1 type, and 2 or more types may be mixed and used for them.
Examples of the method for firing bamboo include known methods, such as a method of firing in a charcoal kiln or a method of mechanically firing using a carbonization furnace using a material such as stainless steel. Note that the method of mechanically baking using a carbonization furnace includes a method of performing heat treatment in an oxygen-free atmosphere using heated steam. The firing conditions are 400 to 1000 ° C. for several days to one week when firing in a charcoal kiln, and about 6 to 8 hours at 400 to 1000 ° C. when mechanically firing using a carbonization furnace. Done. However, when heat treatment is performed with heated steam, it may be performed in a short time of about 15 minutes to 1 hour.
　竹炭は、一般に、木炭等よりも微細な孔を多く生成する。かかる微細な孔は、竹の栄養や水分等を吸い上げるための仮導管が炭化結晶化したマクロ管と、その内壁に存在する更に細かいミクロ管とが隙間なく並んだものであり、いわゆるハニカム構造となっている。また、竹は、繊維構造が縦方向に揃い、直線状であるため、かかる微細な孔も互いに直線状に揃いやすい。なお、マクロ管の平均孔径はおおよそ１０～４０μｍであり、ミクロ管の平均孔径はおおよそ１～５ｎｍである。
　また、竹には珪酸およびカリウムが比較的多く含まれており、これらは、竹炭に焼成された際にガラス状に固まる性質がある。このため、竹炭は、一般に、木炭等よりもガラス状の物質を多く含むと考えられる。 Bamboo charcoal generally produces more fine holes than charcoal and the like. Such fine pores are macro tubes in which temporary conduits for sucking up bamboo nutrients and moisture etc. are carbonized and finer micro tubes existing on the inner wall thereof are arranged without gaps, so-called honeycomb structure and It has become. Moreover, since bamboo has a fiber structure that is aligned in the vertical direction and is linear, such fine holes are also easily aligned with each other. The average pore diameter of the macro tube is approximately 10 to 40 μm, and the average pore diameter of the micro tube is approximately 1 to 5 nm.
Bamboo contains a relatively large amount of silicic acid and potassium, and these have the property of solidifying into glass when fired into bamboo charcoal. For this reason, bamboo charcoal is generally considered to contain more glassy substances than charcoal and the like.
　竹炭の比表面積は、例えば窒素吸着によるＢＥＴ多点法を用いた算出値として、好ましくは、１００ｍ２／ｇ以上であり、より好ましくは２００ｍ２／ｇ以上である。
　一方、竹炭の比表面積は、好ましくは、１，０００ｍ２／ｇ以下であり、より好ましくは５００ｍ２／ｇ以下である。これにより、隠蔽性を向上させることができる。
　竹炭の比表面積の測定は、ＪＩＳ　Ｚ８８３０に準拠して測定できる。 The specific surface area of bamboo charcoal is preferably 100 m 2 / g or more, more preferably 200 m 2 / g or more, for example, as a calculated value using a BET multipoint method by nitrogen adsorption.
On the other hand, the specific surface area of bamboo charcoal is preferably 1,000 m 2 / g or less, more preferably 500 m 2 / g or less. Thereby, concealment property can be improved.
The specific surface area of bamboo charcoal can be measured according to JIS Z8830.
　竹炭の５０％粒子径（Ｄ５０）は、好ましくは、０．０５μｍ以上であり、より好ましくは１μｍ以上であり、さらに好ましくは２．５μｍである。これにより、適切な分散性を得ることができる。
　一方、竹炭の５０％粒子径（Ｄ５０）は、好ましくは、１０μｍ以下であり、より好ましくは８．０μｍ以下であり、さらに好ましくは５．０μｍ以下である。これにより、適切な塗膜を形成しつつ隠蔽性を向上させることができる。
　また、竹炭の９０％粒子径（Ｄ９０）は、２０μｍ以下であることが好ましく、１０μｍ以下であることがより好ましい。
　なお、竹炭の５０％粒子径（Ｄ５０）および９０％粒子径（Ｄ９０）の測定は、例えばレーザー回折・散乱法にて粒度分布を体積基準で測定して求めることができる。 The 50% particle diameter (D50) of bamboo charcoal is preferably 0.05 μm or more, more preferably 1 μm or more, and even more preferably 2.5 μm. Thereby, appropriate dispersibility can be obtained.
On the other hand, the 50% particle size (D50) of bamboo charcoal is preferably 10 μm or less, more preferably 8.0 μm or less, and even more preferably 5.0 μm or less. Thereby, concealability can be improved, forming a suitable coating film.
The 90% particle diameter (D90) of bamboo charcoal is preferably 20 μm or less, and more preferably 10 μm or less.
In addition, the measurement of 50% particle diameter (D50) and 90% particle diameter (D90) of bamboo charcoal can be obtained by measuring the particle size distribution on a volume basis by, for example, a laser diffraction / scattering method.
　竹炭の含有量は、絶縁性遮光用印刷インキ中の固形分１００質量部に対し、好ましくは４０質量部以上であり、より好ましくは７０質量部以上である。これにより、印刷特性を維持しつつ、隠蔽性を向上させつつ、絶縁性も高めることができる。
　一方、竹炭の含有量は、絶縁性遮光用印刷インキ中の固形分１００質量部に対し、好ましくは９０質量部以下であり、より好ましくは８０質量部以下である。これにより、適度な流動性が得られ、良好な印刷ができるようになる。 The content of bamboo charcoal is preferably 40 parts by mass or more, and more preferably 70 parts by mass or more with respect to 100 parts by mass of the solid content in the insulating light-shielding printing ink. Thereby, insulating property can also be improved, improving a concealing property, maintaining a printing characteristic.
On the other hand, the bamboo charcoal content is preferably 90 parts by mass or less, more preferably 80 parts by mass or less, with respect to 100 parts by mass of the solid content in the insulating light-shielding printing ink. Thereby, moderate fluidity | liquidity is obtained and favorable printing can be performed now.
　竹炭は、インキ特性を好適にする観点から、表面を物理的または化学的に処理されたものであってもよい。 Bamboo charcoal may be obtained by physically or chemically treating the surface from the viewpoint of making ink characteristics suitable.
　バインダー樹脂は、竹炭を分散し印刷塗膜を形成するために用いられる。
　バインダー樹脂は、化学的に有機合成させた樹脂であればよく、多様な樹脂を用いることができる。竹炭との相溶性を良好にし、より高水準で高絶縁性および隠蔽性を両立する観点から、バインダー樹脂としては、塩化ビニル－酢酸ビニル共重合樹脂（本明細書において「塩ビ樹脂」ともいう）、アクリル樹脂、ポリエステル樹脂、エポキシ樹脂、ポリカーボネート樹脂、ポリオレフィン樹脂、合成ゴム、セルロース樹脂、マレイン酸樹脂、フェノール樹脂、ポリウレタン樹脂、ポリアミド樹脂、ポリイミド樹脂、メラミン樹脂、フェノキシ樹脂、および活性エネルギー線硬化型樹脂、ならびにこれらの変性物、ならびに天然樹脂の変性物のなかから選ばれる一種または二種以上であることが好ましい。なかでも、塩化ビニル－酢酸ビニル共重合樹脂、アクリル樹脂、ポリエステル樹脂もしくはエポキシ樹脂、またはこれらの変性物であることがより好ましく、ポリエステル樹脂であることがさらに好ましい。 The binder resin is used to disperse bamboo charcoal and form a printed coating film.
The binder resin may be any resin that is chemically organically synthesized, and various resins can be used. As a binder resin, a vinyl chloride-vinyl acetate copolymer resin (also referred to as a “vinyl chloride resin” in this specification) is used from the viewpoint of improving compatibility with bamboo charcoal and achieving both high insulation and hiding properties at a higher level. , Acrylic resin, polyester resin, epoxy resin, polycarbonate resin, polyolefin resin, synthetic rubber, cellulose resin, maleic acid resin, phenol resin, polyurethane resin, polyamide resin, polyimide resin, melamine resin, phenoxy resin, and active energy ray curable type It is preferable that it is 1 type, or 2 or more types chosen from resin, these modified products, and the modified product of natural resin. Among these, a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, a polyester resin or an epoxy resin, or a modified product thereof is more preferable, and a polyester resin is more preferable.
　バインダー樹脂の含有量は、竹炭１００質量部に対し、好ましくは１０質量部以上であり、より好ましくは２０質量部以上であり、一方、好ましくは１５０質量部以下であり、より好ましくは１２０質量部以下である。上記下限値以上とすることにより、良好な印刷特性を得ることができ、一方、上限値以下とすることにより、より高水準で絶縁性と隠蔽性を両立できるようになる。 The content of the binder resin is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and preferably 150 parts by mass or less, more preferably 120 parts by mass with respect to 100 parts by mass of bamboo charcoal. It is as follows. By setting it to the above lower limit value or more, good printing characteristics can be obtained. On the other hand, by setting it to the upper limit value or less, both insulation and concealment can be achieved at a higher level.
　本発明の絶縁性遮光用印刷インキは、竹炭とバインダー樹脂とを含むことで、絶縁性および隠蔽性を両立できる。かかるメカニズムの詳細は明らかではないが、上述したように、竹炭は、一般に、木炭よりも微細な孔を多く含み、いわゆるハニカム構造と呼ばれる微細な孔が隙間なく並んだ構造を有する。そのため、かかる微細な孔の入口付近や孔の内部にバインダー樹脂が入り込むことができる。また、竹炭は、一般に、木炭よりもガラス状の物質を多く含むため、バインダー樹脂との濡れが木炭よりも良好になると考えられる。
　その結果、バインダー樹脂が竹炭をコーティングした状態になり、竹炭の配合量を増やして隠蔽性を高めても、抵抗値の低下を抑制できるため、絶縁性および隠蔽性を両立できると推測される。さらには、本発明の絶縁性遮光用印刷インキは、導電性が比較的高い竹炭を用いた場合であっても、上記のように竹炭がバインダー樹脂によりコーティングされるため、良好な絶縁性を得ることができる。 The insulating light-shielding printing ink of the present invention includes both bamboo charcoal and a binder resin, so that both insulating properties and concealing properties can be achieved. Although details of such a mechanism are not clear, as described above, bamboo charcoal generally has more fine holes than charcoal, and has a structure in which fine holes called a honeycomb structure are arranged without gaps. Therefore, the binder resin can enter the vicinity of the entrance of such fine holes or the inside of the holes. Moreover, since bamboo charcoal generally contains more glassy substances than charcoal, it is considered that wetting with the binder resin is better than charcoal.
As a result, the binder resin is coated with bamboo charcoal, and even if the blending amount of bamboo charcoal is increased to improve the concealing property, the decrease in resistance value can be suppressed, so that it is presumed that both insulating properties and concealing properties can be achieved. Furthermore, the insulating light-shielding printing ink of the present invention obtains good insulation because bamboo charcoal is coated with the binder resin as described above even when bamboo charcoal having a relatively high conductivity is used. be able to.
　本発明の絶縁性遮光用印刷インキは、以下の条件を満たすことで、より高水準で、絶縁性および隠蔽性を両立できる。かかる理由は明らかではないが、本発明者が、竹炭を用いた絶縁性遮光用印刷インキについて研究を重ねている中で、当該条件における光学濃度（ＯＤ）値を特定の範囲内に制御することが、絶縁性遮光用印刷インキの用途に適した隠蔽性と絶縁性の両立を実現させる指標として有効なことを知見した。
　本発明の絶縁性遮光用印刷インキは、ワイヤー径が６ミルのバーコーター（ＲＫ　Ｐｒｉｎｔ　Ｃｏａｔ　Ｉｎｓｔｒｕｍｅｎｔｓ　Ｌｔｄ．製、バーＮｏ．２）を用いて移動速度５０ｍｍ／秒で引いてガラス基材上に塗布し、得られた塗膜の光学濃度（ＯＤ）値が、好ましくは、１．０以上、７．０以下である。当該塗膜は、８０℃で、６０分間にわたって乾燥した後に得られるものである。
　当該塗膜の光学濃度（ＯＤ）値は、隠蔽性を得る観点から、より好ましくは、３．５以上である。一方、当該塗膜の光学濃度（ＯＤ）値は、良好なインキ流動性、印刷特性および密着性等を得る観点から、より好ましくは、６．０以下である。 The insulating light-shielding printing ink of the present invention can satisfy both the insulating property and the concealing property at a higher level by satisfying the following conditions. The reason for this is not clear, but the present inventor has been researching insulating light-shielding printing ink using bamboo charcoal, and controls the optical density (OD) value under the above conditions within a specific range. However, it has been found that it is effective as an index for realizing both concealability and insulation suitable for the use of the insulating light-shielding printing ink.
The insulating light-shielding printing ink of the present invention is applied onto a glass substrate by pulling at a moving speed of 50 mm / sec using a bar coater (manufactured by RK Print Coat Instruments Ltd., bar No. 2) having a wire diameter of 6 mils. The optical density (OD) value of the obtained coating film is preferably 1.0 or more and 7.0 or less. The coating film is obtained after drying at 80 ° C. for 60 minutes.
The optical density (OD) value of the coating film is more preferably 3.5 or more from the viewpoint of obtaining concealability. On the other hand, the optical density (OD) value of the coating film is more preferably 6.0 or less from the viewpoint of obtaining good ink fluidity, printing characteristics, adhesion, and the like.
　本発明の絶縁性遮光用印刷インキにおいて、当該塗膜の光学濃度（ＯＤ）値を制御するためには、竹炭の焼成温度、平均粒径や比表面積等に応じたバインダー樹脂の種類の特定、竹炭とバインダー樹脂との配合比、バインダー樹脂に対する竹炭の分散度合い等を制御することによって初めて得られる。また分散度合いを制御するには、竹炭とバインダー樹脂との組み合わせ等に応じて、例えば、分散機器でのせん断力の強さおよび処理回数等を選択することで行うことになる。 In the insulating light-shielding printing ink of the present invention, in order to control the optical density (OD) value of the coating film, the type of binder resin depending on the firing temperature, average particle diameter, specific surface area, etc. of bamboo charcoal, It can be obtained for the first time by controlling the blending ratio of bamboo charcoal and binder resin, the degree of dispersion of bamboo charcoal with respect to the binder resin, and the like. Further, the degree of dispersion is controlled by selecting the strength of shearing force and the number of treatments in the dispersing device, for example, according to the combination of bamboo charcoal and binder resin.
　なお、ＯＤ値とは、光の透過率（Ｔ％）を対数で表した数値である。一般に、ＯＤ値が高いほど、光の透過率が低いことを意味する。
　また、ＯＤ値は、例えば、透過濃度計「型式３４１Ｃ」（Ｘ－Ｒｉｔｅ社製）を用いて測定することができる。 The OD value is a numerical value representing the light transmittance (T%) in logarithm. In general, the higher the OD value, the lower the light transmittance.
The OD value can be measured using, for example, a transmission densitometer “Model 341C” (manufactured by X-Rite).
　また、本発明の絶縁性遮光用印刷インキは、本発明の効果を損なわない範囲で、竹炭以外の顔料をさらに配合してもよい。この場合、全顔料に対する竹炭の含有量は、高絶縁性を得る観点から、５０質量％以上であることが好ましく、８０質量％以上であることがより好ましく、１００質量％としてもよい。 The insulating light-shielding printing ink of the present invention may further contain a pigment other than bamboo charcoal as long as the effects of the present invention are not impaired. In this case, the content of bamboo charcoal with respect to the total pigment is preferably 50% by mass or more, more preferably 80% by mass or more, and may be 100% by mass from the viewpoint of obtaining high insulation.
　また、本発明の絶縁性遮光用印刷インキは、公知のインキ用添加剤成分を含んでもよい。公知のインキ用添加剤としては、例えば、溶剤、酸化防止剤等の安定剤、レベリング剤、消泡剤、増粘剤、沈降防止剤、湿潤分散剤、帯電防止剤、防曇剤等の界面活性剤類、ワックス、スリップ剤、カップリング剤、シランカップリング剤、近赤外線吸収剤等の各種添加剤などが挙げられる。
　溶剤としては、例えば、ミネラルスピリット、トルエン、キシレン、炭素数８～１１の芳香族炭化水素などの炭化水素類；酢酸エチル、酢酸ｎ－ブチル、酢酸イソブチル、エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、ブチルカルビトールアセテート、２塩基酸エステルなどのエステル類；エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、ジエチレングリコールなどのエーテル類；メチルエチルケトン、メチルイソブチルケトン、ジイソブチルケトン、シクロヘキサノン、イソホロンなどのケトン類；メタノール、エタノール、イソプロパノール、ｎ－ブタノール、イソブタノール、ジアセトンアルコール、３－メチル－３－メトキシブタノールなどのアルコール類などを挙げることができる。これら溶剤は１種単独で又は２種以上を混合して使用してもよい。なかでも、ケトン類、エステル類および炭化水素類が好ましい。 The insulating light-shielding printing ink of the present invention may contain a known ink additive component. Known ink additives include, for example, stabilizers such as solvents, antioxidants, leveling agents, antifoaming agents, thickeners, antisettling agents, wetting and dispersing agents, antistatic agents, antifogging agents and the like. Examples include activators, waxes, slip agents, coupling agents, silane coupling agents, various additives such as near infrared absorbers, and the like.
Examples of the solvent include mineral spirits, toluene, xylene, hydrocarbons such as aromatic hydrocarbons having 8 to 11 carbon atoms; ethyl acetate, n-butyl acetate, isobutyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl Esters such as ether acetate, butyl carbitol acetate, and dibasic acid esters; ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, and diethylene glycol; ketones such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, and isophorone Methanol, ethanol, isopropanol, n-butanol, isobutanol, diacetone alcohol, 3-methyl-3-methoxybutanol How alcohol, and the like. These solvents may be used alone or in combination of two or more. Of these, ketones, esters and hydrocarbons are preferred.
　絶縁性遮光用印刷インキは、竹炭、およびバインダー樹脂を公知の方法で混合することで形成される。例えば、樹脂バインダーに竹炭を加えて、適当な分散装置を用いて分散させて、インキを得ることができる。このとき、上記の条件における光学濃度（ＯＤ）値を特定の範囲内に制御する観点から、例えば、３本ロールミル分散装置を使用する場合、ロール長当たり線圧を２０Ｎ／ｍｍ～６０Ｎ／ｍｍに設定して適切なせん断力が加わるようにしたうえで、望ましくは処理回数（パス回数）を２回以上とするのがよい。 The insulating light-shielding printing ink is formed by mixing bamboo charcoal and a binder resin by a known method. For example, an ink can be obtained by adding bamboo charcoal to a resin binder and dispersing it using an appropriate dispersing device. At this time, from the viewpoint of controlling the optical density (OD) value under the above conditions within a specific range, for example, when using a three-roll mill disperser, the linear pressure per roll length is 20 N / mm to 60 N / mm. It is preferable to set the number of treatments (number of passes) to 2 or more after setting and applying an appropriate shearing force.
　本発明の絶縁性遮光用印刷インキは、遮光性が必要とされるスマートフォン、タブレット型パソコン、カーナビゲーションシステムおよびインターホン等の電子機器に設けられているタッチ機能付き保護パネル印刷などの用途に特に好適である。本発明の絶縁性遮光用印刷インキによれば、このような用途において、電子機器におけるバックライトを遮光したり、電子機器内部の電極配線を隠すといった高隠蔽性を得つつ、電子機器の誤動作を防止することができる。 The insulating light-shielding printing ink of the present invention is particularly suitable for applications such as protection panel printing with a touch function provided in electronic devices such as smartphones, tablet computers, car navigation systems, and intercoms that require light-shielding properties. It is. According to the insulating light-shielding printing ink of the present invention, in such applications, the electronic device malfunctions while obtaining high concealment such as shielding the backlight in the electronic device or concealing the electrode wiring inside the electronic device. Can be prevented.
＜絶縁性部材＞
　本発明の絶縁性部材は、基材と、基材上に形成された上記の絶縁性遮光用印刷インキによる塗布膜と、を備える。 <Insulating member>
The insulating member of the present invention includes a base material and a coating film formed of the above-described insulating light-shielding printing ink formed on the base material.
　基材は、特に限定されないが、ポリエステル、ポリアミド、ポリカーボネート、アクリル、ポリウレタン、ポリオレフィン、石英ガラス、ソーダライムガラス、無アルカリガラス、サファイヤガラス、化学強化ガラス、およびそれらの複合材料のなかから選ばれる一種または二種以上を材料として用いて形成されるものが挙げられる。これらの材料から形成された基材は、その表面に曇り止め処理、強化処理、反射防止処理、熱線カット処理、着色処理、またはＩＴＯ（酸化インジウム・スズ）導電膜処理が施されたものであってもよい。また、基材の形状は特に限定されない。 The substrate is not particularly limited, but is selected from polyester, polyamide, polycarbonate, acrylic, polyurethane, polyolefin, quartz glass, soda lime glass, alkali-free glass, sapphire glass, chemically tempered glass, and composite materials thereof. Or what is formed using 2 or more types as a material is mentioned. The base material formed from these materials has a surface that has been subjected to anti-fogging treatment, strengthening treatment, antireflection treatment, heat ray cutting treatment, coloring treatment, or ITO (indium tin oxide) conductive film treatment. May be. Moreover, the shape of a base material is not specifically limited.
　塗布膜の形成方法は、特に限定されず、公知の方法を用いることができる。また、塗膜の厚みは、例えば、３～２００μｍである。 The method for forming the coating film is not particularly limited, and a known method can be used. The thickness of the coating film is, for example, 3 to 200 μm.
　絶縁性部材としては、上述したような電子機器のタッチ機能付き保護パネルなどが挙げられる。 Examples of the insulating member include a protection panel with a touch function of an electronic device as described above.
　また、絶縁性部材は、基材と、上記の絶縁性遮光用印刷インキによる塗膜層との間に、単層または多層の他の層を有していてもよい。また、上記の絶縁性遮光用印刷インキによる塗膜層を複数層有していてもよい。たとえば、基材上に白色インキによる塗膜層を複数重ね、その上に、上記の絶縁性遮光用印刷インキによる塗膜層を重ねてもよい。 Further, the insulating member may have a single layer or other multilayers between the base material and the coating layer made of the above-described insulating light-shielding printing ink. Moreover, you may have two or more coating-film layers by said insulating light-shielding printing ink. For example, a plurality of coating layers of white ink may be stacked on a substrate, and a coating layer of the above-described insulating light-shielding printing ink may be stacked thereon.
＜竹炭の使用方法＞
　本発明の竹炭の使用方法は、竹炭を上記の絶縁性遮光用印刷インキとしての使用するものである。これにより、絶縁性と隠蔽性を両立できる、循環系資源を用いた環境に優しいインキを提供できる。 <How to use bamboo charcoal>
The method for using bamboo charcoal of the present invention is to use bamboo charcoal as the above-described insulating light-shielding printing ink. As a result, it is possible to provide an environmentally friendly ink using circulating resources that can achieve both insulation and concealment.
　以上、本発明の実施形態について述べたが、これらは本発明の例示であり、上記以外の様々な構成を採用することもできる。 As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above can also be employ | adopted.
　次に、実施例により本発明を詳しく説明するが、本発明の内容は実施例に限られるものではない。 Next, the present invention will be described in detail with reference to examples, but the contents of the present invention are not limited to the examples.
（顔料）
　実施例および比較例で使用した顔料は、以下の表１、２に示す通りである。 (Pigment)
The pigments used in Examples and Comparative Examples are as shown in Tables 1 and 2 below.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
（バインダー樹脂）
　実施例および比較例で使用したバインダー樹脂は、以下の表３に示す通りである。 (Binder resin)
The binder resins used in Examples and Comparative Examples are as shown in Table 3 below.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
＜実施例１～１１＞
　表４に示す配合（質量部）となるように、バインダー樹脂に有機溶媒（イソホロン、エボニックインダストリー社製）および竹炭を加えて、回転翼式の小型攪拌機にてプレミキシングを行った。その後、３本ロールミル分散装置（ビューラー株式会社製、ＳＤＹ―２００型）を使用し、ロール長当たり線圧を４０Ｎ／ｍｍに設定してパス回数２回という条件で分散させて、インキを得た。 <Examples 1 to 11>
An organic solvent (Isophorone, manufactured by Evonik Industries) and bamboo charcoal were added to the binder resin so as to have the composition (parts by mass) shown in Table 4, and premixing was performed with a rotary blade type small stirrer. Thereafter, using a three-roll mill dispersing device (Bueller Co., Ltd., SDY-200 type), the linear pressure per roll length was set to 40 N / mm and dispersed under the condition that the number of passes was two times to obtain ink. .
＜比較例１～９＞
　表４に示す配合（質量部）となるように、竹炭の替わりに、ヤシガラ炭Ｄ、カーボンブラックＥまたは酸化鉄Ｆを用いた以外は、実施例１～９と同様にして、インキを得た。 <Comparative Examples 1 to 9>
Inks were obtained in the same manner as in Examples 1 to 9, except that coconut husk charcoal D, carbon black E or iron oxide F was used instead of bamboo charcoal so as to obtain the composition (parts by mass) shown in Table 4. .
　実施例および比較例で得られたインキについて、以下の測定および評価を行った。結果を、表４、５に示す。
＜測定＞
・インキを、ワイヤー径が６ミルのバーコーター（ＲＫ　Ｐｒｉｎｔ　Ｃｏａｔ　Ｉｎｓｔｒｕｍｅｎｔｓ　Ｌｔｄ．製、バーＮｏ．２）を用いて移動速度５０ｍｍ／秒で引いてガラス基材上に塗布し、８０℃での６０分間の条件で乾燥させ、塗膜を得た。得られた塗膜の光学濃度（ＯＤ）値をそれぞれ測定した。 The following measurements and evaluations were performed on the inks obtained in Examples and Comparative Examples. The results are shown in Tables 4 and 5.
<Measurement>
Ink was applied onto a glass substrate by using a bar coater having a wire diameter of 6 mil (manufactured by RK Print Coat Instruments Ltd., bar No. 2) at a moving speed of 50 mm / sec. The coating film was obtained by drying under the condition of minutes. The optical density (OD) value of the obtained coating film was measured, respectively.
＜評価＞
・絶縁性：抵抗値（Ω）の測定
　インキを、ワイヤー径が６ミルのバーコーター（ＲＫ　Ｐｒｉｎｔ　Ｃｏａｔ　Ｉｎｓｔｒｕｍｅｎｔｓ　Ｌｔｄ．製、バーＮｏ．２）を用いて移動速度５０ｍｍ／秒で引いてガラス基材上に塗布し、８０℃での６０分間の条件で乾燥させ、塗膜を形成した。
　超絶縁計「型式ＳＭ－２１Ｅ」（東亜電波工業株式会社製）を使用し、測定端子間の距離を１５ｍｍとして塗膜表面に軽く押し当て、塗膜表面の抵抗値を測定した。測定電圧は１ｋｖとし、３か所の測定を行い、その平均値をとった。なお、測定電圧を１ｋｖとしたときの測定範囲は１．０×１０６Ω～２．０×１０１３Ωであった。 <Evaluation>
Insulating property: measurement of resistance value (Ω) The ink was drawn at a moving speed of 50 mm / second using a bar coater (manufactured by RK Print Coat Instruments Ltd., bar No. 2) having a wire diameter of 6 mil, and a glass substrate. It was applied on top and dried at 80 ° C. for 60 minutes to form a coating film.
Using a super insulation meter “model SM-21E” (manufactured by Toa Denpa Kogyo Co., Ltd.), the distance between the measuring terminals was set to 15 mm and lightly pressed against the surface of the coating film, and the resistance value of the coating film surface was measured. The measurement voltage was 1 kv, measurements were taken at three locations, and the average value was taken. The measurement range when the measurement voltage was 1 kv was 1.0 × 10 6 Ω to 2.0 × 10 13 Ω.
・隠蔽性：目視による官能評価
　インキを、ワイヤー径が６ミルのバーコーター（ＲＫ　Ｐｒｉｎｔ　Ｃｏａｔ　Ｉｎｓｔｒｕｍｅｎｔｓ　Ｌｔｄ．製、バーＮｏ．２）を用いて移動速度５０ｍｍ／秒で引いてガラス基材上に塗布し、８０℃での６０分間の条件で乾燥させ、塗膜を形成し、印刷物を得た。
　得られた印刷物の印刷面側（塗膜面側）から蛍光灯の光を当て、ガラス基材側から見た蛍光灯の光の隠蔽具合を、熟練した専門家により、４段階評価にて行った。
◎：蛍光灯の光がまったく透過しない。
○：蛍光灯の光がわずかに透過する。
△：蛍光灯の光がある程度透過する。
×：蛍光灯の光が相当量透過する。 Concealing property: visual sensory evaluation Ink was applied onto a glass substrate by pulling at a moving speed of 50 mm / sec using a bar coater (manufactured by RK Print Coat Instruments Ltd., bar No. 2) having a wire diameter of 6 mil. And dried at 80 ° C. for 60 minutes to form a coating film and obtain a printed matter.
Fluorescent lamp light is applied from the printed surface side (coating surface side) of the obtained printed matter, and the concealment of the fluorescent lamp light viewed from the glass substrate side is performed by a skilled expert in a four-step evaluation. It was.
A: The light from the fluorescent lamp is not transmitted at all.
○: The light from the fluorescent lamp is slightly transmitted.
(Triangle | delta): The light of a fluorescent lamp permeate | transmits to some extent.
X: A considerable amount of light from a fluorescent lamp is transmitted.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
　この出願は、２０１７年５月１２日に出願された日本出願特願２０１７－０９５４９８号を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on Japanese Patent Application No. 2017-095498 filed on May 12, 2017, the entire disclosure of which is incorporated herein.

Claims (13)

  1. 　竹炭と、バインダー樹脂とを含む絶縁性遮光用印刷インキ。 Insulating light shielding printing ink containing bamboo charcoal and binder resin.
  2. 　前記竹炭の含有量は、前記絶縁性遮光用印刷インキ中の固形分１００質量部に対し、４０質量部以上、９０質量部以下である、請求項１に記載の絶縁性遮光用印刷インキ。 The insulating light-shielding printing ink according to claim 1, wherein the content of the bamboo charcoal is 40 parts by mass or more and 90 parts by mass or less with respect to 100 parts by mass of the solid content in the insulating light-shielding printing ink.
  3. 　当該絶縁性遮光用印刷インキを、ワイヤー径が６ミルのバーコーターを用いて移動速度５０ｍｍ／秒で引いてガラス基材上に塗布し、得られた塗膜の光学濃度（ＯＤ）値が、１．０以上、７．０以下である、請求項１または２に記載の絶縁性遮光用印刷インキ。 The insulating light-shielding printing ink was applied onto a glass substrate by using a bar coater having a wire diameter of 6 mils at a moving speed of 50 mm / second, and the optical density (OD) value of the obtained coating film was The insulating light-shielding printing ink according to claim 1 or 2, which is 1.0 or more and 7.0 or less.
  4. 　前記バインダー樹脂が、塩化ビニル－酢酸ビニル共重合樹脂、アクリル樹脂、ポリエステル樹脂、エポキシ樹脂、ポリカーボネート樹脂、ポリオレフィン樹脂、合成ゴム、セルロース樹脂、マレイン酸樹脂、フェノール樹脂、ポリウレタン樹脂、ポリアミド樹脂、ポリイミド樹脂、メラミン樹脂、フェノキシ樹脂、および活性エネルギー線硬化型樹脂、ならびにこれらの変性物、ならびに天然樹脂の変性物のなかから選ばれる一種または二種以上である、請求項１乃至３いずれか一項に記載の絶縁性遮光用印刷インキ。 The binder resin is vinyl chloride-vinyl acetate copolymer resin, acrylic resin, polyester resin, epoxy resin, polycarbonate resin, polyolefin resin, synthetic rubber, cellulose resin, maleic acid resin, phenol resin, polyurethane resin, polyamide resin, polyimide resin. The melamine resin, the phenoxy resin, the active energy ray-curable resin, and a modified product thereof, and one or more selected from the modified products of natural resins. Insulating light shielding printing ink as described.
  5. 　前記バインダー樹脂が、塩化ビニル－酢酸ビニル共重合樹脂、アクリル樹脂、ポリエステル樹脂、およびエポキシ樹脂、ならびにこれらの変性物のなかから選ばれる一種または二種以上である、請求項１乃至４いずれか一項に記載の絶縁性遮光用印刷インキ。 5. The binder resin according to claim 1, wherein the binder resin is one or more selected from vinyl chloride-vinyl acetate copolymer resin, acrylic resin, polyester resin, epoxy resin, and modified products thereof. Insulating light-shielding printing ink described in the paragraph.
  6. 　前記竹炭の５０％粒子径（Ｄ５０）が０．０５μｍ以上、１０μｍ以下である、請求項１乃至５いずれか一項に記載の絶縁性遮光用印刷インキ。 The insulating light-shielding printing ink according to any one of claims 1 to 5, wherein the bamboo charcoal has a 50% particle size (D50) of 0.05 µm or more and 10 µm or less.
  7. 　前記バインダー樹脂が、塩化ビニル－酢酸ビニル共重合樹脂、アクリル樹脂、ポリエステル樹脂、およびエポキシ樹脂、ならびにこれらの変性物のなかから選ばれる一種または二種以上であり、
    　前記竹炭の５０％粒子径（Ｄ５０）が、２．５μｍ以上、８.０μｍ以下である、請求項１乃至６いずれか一項に記載の絶縁性遮光用印刷インキ。     The binder resin is one or more selected from vinyl chloride-vinyl acetate copolymer resin, acrylic resin, polyester resin, and epoxy resin, and modified products thereof,
    The insulating light-shielding printing ink according to any one of claims 1 to 6, wherein the bamboo charcoal has a 50% particle diameter (D50) of 2.5 µm or more and 8.0 µm or less.
  8. 　前記竹炭の、窒素吸着によるＢＥＴ多点法を用いた比表面積が、１００ｍ２／ｇ以上、１，０００ｍ２／ｇ以下である、請求項１乃至７いずれか一項に記載の絶縁性遮光用印刷インキ。 The insulating light-shielding material according to any one of claims 1 to 7, wherein a specific surface area of the bamboo charcoal using a BET multipoint method by nitrogen adsorption is 100 m 2 / g or more and 1,000 m 2 / g or less. Printing ink.
  9. 　電子機器に設けられているタッチ機能付き保護パネル印刷に用いられる、請求項１乃至８いずれか一項に記載の絶縁性遮光用印刷インキ。 The insulating light-shielding printing ink according to any one of claims 1 to 8, which is used for printing a protective panel with a touch function provided in an electronic device.
  10. 　基材と、前記基材上に形成された請求項１乃至９いずれか一項に記載の絶縁性遮光用印刷インキによる塗布膜と、を備える絶縁性部材。 An insulating member comprising: a base material; and a coating film formed of the insulating light-shielding printing ink according to any one of claims 1 to 9 formed on the base material.
  11. 　前記基材が、ポリエステル、ポリアミド、ポリカーボネート、アクリル、ポリウレタン、ポリオレフィン、石英ガラス、ソーダライムガラス、無アルカリガラス、サファイヤガラス、化学強化ガラス、およびそれらの複合材料のなかから選ばれる一種または二種以上を用いて形成された、請求項１０に記載の絶縁性部材。 The base material is one or more selected from polyester, polyamide, polycarbonate, acrylic, polyurethane, polyolefin, quartz glass, soda lime glass, alkali-free glass, sapphire glass, chemically strengthened glass, and composite materials thereof. The insulating member according to claim 10, formed using
  12. 　竹炭を、バインダー樹脂と共に絶縁性遮光用印刷インキとして使用する竹炭の使用方法。 A method of using bamboo charcoal that uses bamboo charcoal together with a binder resin as an insulating shading printing ink.
  13. 　竹炭およびバインダー樹脂の、絶縁性遮光用印刷インキ製造のための使用。 Use of bamboo charcoal and binder resin for the production of insulating light-shielding printing ink.
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JP2006335922A (en) * 2005-06-03 2006-12-14 Toyo Ink Mfg Co Ltd Ink
JP2008179737A (en) * 2007-01-26 2008-08-07 Toyo Ink Mfg Co Ltd Charcoal ink
JP2016204517A (en) * 2015-04-22 2016-12-08 凸版印刷株式会社 Inkjet Ink

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