WO2022264643A1 - 非焼成鉛筆芯及び非焼成鉛筆芯の製造方法 - Google Patents
非焼成鉛筆芯及び非焼成鉛筆芯の製造方法 Download PDFInfo
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- WO2022264643A1 WO2022264643A1 PCT/JP2022/016268 JP2022016268W WO2022264643A1 WO 2022264643 A1 WO2022264643 A1 WO 2022264643A1 JP 2022016268 W JP2022016268 W JP 2022016268W WO 2022264643 A1 WO2022264643 A1 WO 2022264643A1
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- Prior art keywords
- mass
- acid
- pencil lead
- soluble polymer
- cross
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- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 22
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- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 15
- 229920002472 Starch Polymers 0.000 claims abstract description 13
- 235000019698 starch Nutrition 0.000 claims abstract description 13
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- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 5
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- 235000019422 polyvinyl alcohol Nutrition 0.000 claims abstract description 4
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- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims description 8
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- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 19
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
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- 239000004927 clay Substances 0.000 description 3
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- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
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- 235000021355 Stearic acid Nutrition 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
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- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 2
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- PRAKJMSDJKAYCZ-UHFFFAOYSA-N squalane Chemical compound CC(C)CCCC(C)CCCC(C)CCCCC(C)CCCC(C)CCCC(C)C PRAKJMSDJKAYCZ-UHFFFAOYSA-N 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- UBVSIAHUTXHQTD-UHFFFAOYSA-N 2-n-(4-bromophenyl)-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC=NC(NC=2C=CC(Br)=CC=2)=N1 UBVSIAHUTXHQTD-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- WLDHEUZGFKACJH-ZRUFZDNISA-K Amaranth Chemical compound [Na+].[Na+].[Na+].C12=CC=C(S([O-])(=O)=O)C=C2C=C(S([O-])(=O)=O)C(O)=C1\N=N\C1=CC=C(S([O-])(=O)=O)C2=CC=CC=C12 WLDHEUZGFKACJH-ZRUFZDNISA-K 0.000 description 1
- SGHZXLIDFTYFHQ-UHFFFAOYSA-L Brilliant Blue Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 SGHZXLIDFTYFHQ-UHFFFAOYSA-L 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Chemical compound OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
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- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- IRERQBUNZFJFGC-UHFFFAOYSA-L azure blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[S-]S[S-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] IRERQBUNZFJFGC-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 229920003123 carboxymethyl cellulose sodium Polymers 0.000 description 1
- 229940063834 carboxymethylcellulose sodium Drugs 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
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- 235000019253 formic acid Nutrition 0.000 description 1
- 239000001056 green pigment Substances 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical group [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 description 1
- LDHBWEYLDHLIBQ-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide;hydrate Chemical compound O.[OH-].[O-2].[Fe+3] LDHBWEYLDHLIBQ-UHFFFAOYSA-M 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- SXQCTESRRZBPHJ-UHFFFAOYSA-M lissamine rhodamine Chemical compound [Na+].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=C(S([O-])(=O)=O)C=C1S([O-])(=O)=O SXQCTESRRZBPHJ-UHFFFAOYSA-M 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- JXTPJDDICSTXJX-UHFFFAOYSA-N n-Triacontane Natural products CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC JXTPJDDICSTXJX-UHFFFAOYSA-N 0.000 description 1
- 239000002121 nanofiber Substances 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229920003216 poly(methylphenylsiloxane) Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229960003351 prussian blue Drugs 0.000 description 1
- 239000013225 prussian blue Substances 0.000 description 1
- AZJPTIGZZTZIDR-UHFFFAOYSA-L rose bengal Chemical compound [K+].[K+].[O-]C(=O)C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1C1=C2C=C(I)C(=O)C(I)=C2OC2=C(I)C([O-])=C(I)C=C21 AZJPTIGZZTZIDR-UHFFFAOYSA-L 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229940032094 squalane Drugs 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- UJMBCXLDXJUMFB-UHFFFAOYSA-K trisodium;5-oxo-1-(4-sulfonatophenyl)-4-[(4-sulfonatophenyl)diazenyl]-4h-pyrazole-3-carboxylate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)C1=NN(C=2C=CC(=CC=2)S([O-])(=O)=O)C(=O)C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 UJMBCXLDXJUMFB-UHFFFAOYSA-K 0.000 description 1
- 235000013799 ultramarine blue Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Images
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
- C09D13/00—Pencil-leads; Crayon compositions; Chalk compositions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
- B43K19/02—Pencils with graphite; Coloured pencils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
- B43K19/16—Making non-propelling pencils
- B43K19/18—Making pencil writing-cores
Definitions
- the present invention relates to a non-fired pencil lead and a manufacturing method thereof.
- a fired pencil lead is made by kneading graphite and clay to form a core, sintering the clay at a high temperature of around 1,000 ° C to obtain a core, and then producing pores in the core. It is common to manufacture by impregnating oil etc.
- Such a baked pencil lead is widely used because the oil impregnated in it fixes the graphite to the surface of the paper and the pencil lead has good erasability with an eraser (for example, Japanese Patent Application Laid-Open No. 2007-138031).
- the sintered pencil lead requires heating at around 1,000° C. in order to sinter the clay of the binder, which consumes energy.
- non-baked pencil leads use wax or resin as a binder, which is kneaded with various inorganic or organic pigments, molded into a core shape using an extruder or the like, and then dried as necessary. etc. (for example, JP-A-2012-52109).
- Such non-baked pencil leads have wax or resin binders and may lack strength. Therefore, when the tip is sharpened, sufficient tip strength may not be obtained during writing. In addition, there is almost no erasability with an eraser.
- Each embodiment of the present application has sufficient writing strength even if the tip is sharpened, less deterioration due to moisture absorption, erasability, and improved density of written lines, which could not be obtained by conventional methods.
- An object of the present invention is to provide a non-baked pencil lead that achieves both improved fixability.
- the non-baked pencil lead of the first aspect of the present application comprises a water-soluble polymer, a cross-linking agent, and powder, wherein the water-soluble polymer is selected from the group consisting of carboxymethylcellulose salts, starch, polyvinyl alcohol and xanthan gum.
- said cross-linking agent is selected from the group consisting of acid, polyamide epoxy, polyacrylamide, titanium alkoxide and glyoxal.
- the non-baked pencil lead of the second aspect of the present application is characterized in that the water-soluble polymer is a carboxymethylcellulose salt and the cross-linking agent is an acid.
- the non-fired pencil lead of the third aspect of the present application is characterized in that, in addition to the configuration of the second aspect, the acid is an organic acid.
- the non-baked pencil lead of the fourth aspect of the present application is characterized in that, in addition to the structure of the third aspect, the organic acid is a polymeric acid.
- the non-baked pencil lead of the fifth aspect of the present application is characterized in that, in addition to the configuration of any one of the first to fourth aspects, the powder is at least one of an extender and a pigment.
- the non-fired pencil lead of the sixth aspect of the present application is characterized by including cellulose in addition to any of the configurations of the first to fifth aspects.
- the non-fired pencil lead of the seventh aspect of the present application is characterized in that, in addition to the configuration of any one of the first to sixth aspects, the core body after molding is porous.
- a method for producing a non-baked pencil lead comprises the steps of preparing a mixture of a water-soluble polymer, a cross-linking agent, and powder, and forming the mixture into a core, In the molding step, the water-soluble polymer and the cross-linking agent are reacted to be cross-linked.
- the method for producing a non-baked pencil lead according to the ninth aspect of the present application is characterized in that, in addition to the constitution of the eighth aspect, the water-soluble polymer is a carboxymethylcellulose salt and the cross-linking agent is an acid.
- each embodiment of the present application is configured as described above, it has sufficient writing strength even when the tip is sharpened, less deterioration due to moisture absorption, and erasability, which could not be obtained by conventional methods.
- the non-baked pencil lead of an embodiment of the present application comprises a water-soluble polymer, a cross-linking agent, and a powder
- the water-soluble polymer is selected from the group consisting of carboxymethylcellulose salts, starch, polyvinyl alcohol and xanthan gum
- Said cross-linking agents are selected from the group consisting of acids, polyamide epoxies, polyacrylamides, titanium alkoxides and glyoxal.
- the water-soluble polymer is a carboxymethylcellulose salt and the cross-linking agent is an acid.
- Carboxymethylcellulose salt is a derivative of cellulose in which hydrogen (—H) is substituted with carboxymethyl group (—CH 2 COOH) in some of the hydroxy groups of the glucopyranose monomer that constitutes the skeleton of cellulose.
- carboxymethyl group —CH 2 COOH
- the terminal hydrogen ion of this carboxymethyl group is substituted with a metal ion.
- metal ions include sodium ions and potassium ions.
- carboxymethylcellulose sodium represented by the following structural formula (1) is an example of a carboxymethylcellulose salt.
- the acid may be either an organic acid or an inorganic acid.
- the acid By substituting the sodium ions of sodium carboxymethylcellulose with acid, it becomes acid-type carboxymethylcellulose, making it insoluble and suppressing moisture absorption.
- the powder in this embodiment is at least one of an extender and a pigment.
- the filler is not particularly limited as long as it is used in conventional non-baked pencil leads, and any of them can be used.
- white extenders such as boron nitride, kaolin, talc, mica, and calcium carbonate, and colored extenders, depending on the hue of the solid drawing material, can also be used, as well as mixtures of several of these.
- Boron nitride, kaolin, and talc are particularly preferable because of their physical properties and shape.
- pigments examples include titanium oxide, iron black, carbon black, Prussian blue, ultramarine blue, Blue No. 1, red iron oxide, yellow iron oxide, chromium oxide, chromium hydroxide, zinc oxide, zirconium oxide, cobalt oxide, fish scale foil, oxy Bismuth chloride, mica titanium, Blue No. 2, Blue No. 404, Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 106, DPP Red, Yellow No. 4, Yellow No. 5, Green Pigments such as No. 3 and the like can be mentioned, and these can be used alone or in combination of two or more.
- the acid in this embodiment may be either an inorganic acid or an organic acid, but is more preferably an organic acid.
- Organic acid is a general term for organic compounds that exhibit acidity, and most of them are carboxylic acids such as formic acid, acetic acid, oxalic acid, citric acid, tartaric acid, and acrylic acid.
- carboxylic acids such as formic acid, acetic acid, oxalic acid, citric acid, tartaric acid, and acrylic acid.
- unsaturated carboxylic acids such as acrylic acid having one or more double bonds in the hydrocarbon chain are preferable as the organic acid in this embodiment.
- the above organic acid is desirably a polymeric acid. That is, this polymeric acid is obtained by polymerizing a plurality of molecules of unsaturated carboxylic acid monomers at the double bond portion among the above organic acids.
- the molecular weight of the polymeric acid is not particularly limited, but is preferably 5,000 or more and 1,000,000 or less.
- the molecular weight is 5000 or more, when the sodium ions of the individual monomers constituting the carboxymethylcellulose salt are replaced with acid, the polymers are crosslinked at many points, improving the stability of the bond. do.
- a molecular weight of 1,000,000 or less facilitates mixing with powder.
- the above non-fired pencil lead can be manufactured by the following manufacturing method. That is, it includes a step of preparing a mixture of a carboxymethylcellulose salt, an acid, and a powder, and a step of molding the mixture into a core body, and in the molding step, the carboxymethylcellulose salt and the acid are mixed together. crosslink by reaction.
- a mixture is prepared by kneading carboxymethylcellulose salt, acid, and powder.
- a solvent can also be added as necessary.
- the mixture obtained by the preparation is extruded into the shape of a pencil lead using a plunger-type or screw-type extruder. If a solvent is used, the solvent is removed by drying (about 40° C. for 24 hours).
- a non-fired pencil lead 10 having a substantially cylindrical core body 11 as shown in FIG. 1 is obtained.
- the core after molding is porous with pores derived from the microscopic structure of the powder. The pores may be left as they are, or may be impregnated with oils and/or waxes after heating at 60 to 80° C. for 12 hours, if necessary.
- a lower alcohol such as methanol or ethanol, water, or the like is used.
- oils and fats oils that are liquid at room temperature, such as liquid paraffin, spindle oil, silicone oil, ⁇ -olefin oligomer, squalane, etc.
- silicone oils are particularly preferred, and dimethyl silicone oil, methylphenyl silicone oil, methylhydrogen silicone oil, cyclic dimethyl silicone oil, polyether-modified silicone oil, methylstyryl-modified silicone oil, alkyl-modified silicone oil and the like are preferred. exemplified.
- water-soluble organic polymer binders such as polyvinyl alcohol and methylcellulose can be used as auxiliary binders.
- cellulose may also be included.
- Example 1 The content of powder with respect to the total amount of Example 1 was 70% by mass of graphite and 14% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F20LC, Nippon Paper Industries) was 8% by mass with respect to the total amount. In addition, the content of polyacrylic acid (Aquaric HL-415, Nippon Shokubai) as an acid was 8% by mass with respect to the total amount. Sunrose F20LC had a 1% viscosity at 25° C. of 150 to 250 mPa ⁇ m and a degree of etherification of 0.55 to 0.65.
- Example 2 The content of the powder with respect to the total amount of Example 2 was 70% by mass of graphite and 14% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F10MC, Nippon Paper Industries) was set to 8% by mass with respect to the total amount. Also, the content of polyacrylic acid (Aquaric HL-415, Nippon Shokubai) as an acid relative to the total amount was set to 8% by mass. Sunrose F10MC had a 1% viscosity at 25° C. of 50 to 150 mPa ⁇ m and a degree of etherification of 0.65 to 0.75.
- Example 3 The content of powder with respect to the total amount of Example 3 was 70% by mass of graphite and 14% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) was 8% by mass relative to the total amount. In addition, the content of polyacrylic acid (Aquaric HL-415, Nippon Shokubai) as an acid was 8% by mass with respect to the total amount. Sunrose F30MC had a 1% viscosity at 25° C. of 250 to 350 mPa ⁇ m and a degree of etherification of 0.65 to 0.75.
- Example 4 The content of powder with respect to the total amount of Example 4 was 70% by mass of graphite and 14% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F120MC, Nippon Paper Industries) was 8% by mass relative to the total amount. In addition, the content of polyacrylic acid (Aquaric HL-415, Nippon Shokubai) as an acid was 8% by mass with respect to the total amount. Sunrose F120MC had a 1% viscosity of 850 to 1,200 mPa ⁇ m at 25° C. and a degree of etherification of 0.65 to 0.75.
- Example 5 The content of powder with respect to the total amount of Example 5 was 70% by mass of graphite and 14% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F20HC, Nippon Paper Industries) was 8% by mass with respect to the total amount. In addition, the content of polyacrylic acid (Aquaric HL-415, Nippon Shokubai) as an acid was 8% by mass with respect to the total amount. Sunrose F20HC had a 1% viscosity of 150 to 250 mPa ⁇ m at 25° C. and a degree of etherification of 0.80 to 1.00.
- Example 6 The content of the powder with respect to the total amount of Example 6 was 70% by mass of graphite and 14% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) was 8% by mass relative to the total amount. In addition, the content of polyacrylic acid (Aquaric AS-58, Nippon Shokubai) as an acid was 8% by mass relative to the total amount.
- Example 7 The content of powder with respect to the total amount of Example 7 was 70% by mass of graphite and 20% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) was 5% by mass with respect to the total amount. Also, the content of citric acid as an acid was set to 5% by mass with respect to the total amount.
- Example 8 The content of powder with respect to the total amount of Example 8 was 70% by mass of graphite and 20% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) was 5% by mass with respect to the total amount. Also, the content of oxalic acid as an acid was set to 5% by mass with respect to the total amount.
- Example 9 The content of powder with respect to the total amount of Example 9 was 70% by mass of graphite and 20% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) was 5% by mass with respect to the total amount. Also, the content of hydrochloric acid as an acid was set to 5% by mass with respect to the total amount.
- Comparative Example 1 The content of the powder with respect to the total amount was 70% by mass of graphite and 22% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) was 5% by mass with respect to the total amount. Incidentally, in Comparative Example 1, no acid was contained.
- Comparative Example 2 The content of the powder with respect to the total amount was 70% by mass of graphite and 14% by mass of talc. Also, the content of carboxymethylcellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) was 5% by mass with respect to the total amount. In Comparative Example 2, sodium polyacrylate (Aqualic DL-522) was used in place of the acid, and its content relative to the total amount was 8% by mass.
- Comparative Example 1 which does not contain acid as a raw material, the strength reduction rate was 57.7%, which was less than half of the bending strength immediately after production. Further, in Comparative Example 2 in which salt (sodium polyacrylate) was used instead of acid as the raw material, the rate of decrease in strength was 83.5%, indicating a significant decrease in bending strength.
- the carboxymethyl cellulose salt becomes acid-type carboxymethyl cellulose and is insolubilized by acid, so it is presumed that the reaction with moisture in the air was suppressed.
- a polymeric acid is used as the acid (Examples 1 to 5)
- the acid-type carboxymethylcellulose is stabilized by cross-linking with the linear portion of the polymer. It is assumed that
- Examples 10 to 18 (4) Raw Materials
- the mass % display shown below is content with respect to the whole amount.
- Example 10 In Example 10, 60% by mass of graphite as the powder, 5% by mass of starch (NSP-EA, Niommen Kagaku; the same applies hereinafter) as the water-soluble polymer, and polyvinyl alcohol (PVA-105, Kuraray; the same applies hereinafter). 5% by mass, 5% by mass of polyacrylic acid (Aquaric HL-415, Nippon Shokubai, hereinafter the same) as a polymer organic acid as a cross-linking agent, and carbon black (MA-100, Mitsubishi Chemical) as a pigment. The same applies hereinafter) was used as a composition containing 25% by mass.
- Example 11 contains 48% by mass of graphite as powder, 4% by mass of polyvinyl alcohol as water-soluble polymer, 4% by mass of xanthan gum (Echo Gum, Gokyo Food & Chemical), and 4% by mass of polyacrylic acid as a cross-linking agent. %, 35% by mass of carbon black as a pigment, and 5% by mass of stearic acid soap (LI-ST, Nitto Kasei Kogyo, hereinafter the same) as a metallic soap.
- Example 12 contains 47% by mass of graphite as powder, 6% by mass of starch and 6% by mass of polyvinyl alcohol as water-soluble polymer, and 6% by mass of polyamide epoxy (Sumirez Resin 650, Taoka Kagaku Kogyo) as a cross-linking agent. % and 35% by mass of carbon black as a pigment.
- Example 13 contains 45% by mass of graphite and 10% by mass of talc as powder, 3% by mass of carboxymethyl cellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) as water-soluble polymer, 4% by mass of starch and polyvinyl alcohol 4% by mass, 4% by mass of polyacrylic acid as a cross-linking agent, and 30% by mass of carbon black as a pigment.
- Example 14 contains 45% by mass of graphite and 10% by mass of talc as powder, 1% by mass of carboxymethyl cellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) as water-soluble polymer, 4% by mass of starch and polyvinyl alcohol 4% by mass, 4% by mass of polyacrylic acid as a cross-linking agent, 30% by mass of carbon black as a pigment, and 2% by mass of cellulose nanofiber (TC-02X, Nippon Paper Industries).
- Example 15 contains 45% by mass of graphite and 10% by mass of talc as powder, 1% by mass of carboxymethyl cellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) as water-soluble polymer, 4% by mass of starch and polyvinyl alcohol 4% by mass, 4% by mass of polyacrylic acid as a cross-linking agent, 30% by mass of carbon black as a pigment, and 2% by mass of cellulose powder (KC Flock W-400G, Nippon Paper Industries). .
- Example 16 contains 47% by mass of graphite as powder, 6% by mass of starch and 6% by mass of polyvinyl alcohol as water-soluble polymer, and 6% by mass of polyacrylamide (Hermid PY, Harima Kasei) as a cross-linking agent. , 30% by mass of carbon black, and 5% by mass of stearic acid soap as a metal soap.
- Example 17 contains 50% by mass of graphite and 6% by mass of talc as powder, 2% by mass of carboxymethyl cellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) as water-soluble polymer, 5% by mass of starch and polyvinyl alcohol 5% by mass, 2% by mass of titanium alkoxide (Orgatics TA-10, Matsumoto Fine Chemical) as a cross-linking agent, and 30% by mass of carbon black as a pigment.
- carboxymethyl cellulose sodium salt Sunrose F30MC, Nippon Paper Industries
- starch and polyvinyl alcohol 5% by mass
- titanium alkoxide Orgatics TA-10, Matsumoto Fine Chemical
- Example 18 contains 50% by mass of graphite and 6% by mass of talc as powder, 2% by mass of carboxymethyl cellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) as water-soluble polymer, 5% by mass of starch and polyvinyl alcohol and 2% by mass of glyoxal (reagent, Fuji Film Wako Pure Chemical Industries, Ltd.) as a cross-linking agent, and 30% by mass of carbon black as a pigment.
- carboxymethyl cellulose sodium salt Sunrose F30MC, Nippon Paper Industries
- glyoxal reagent, Fuji Film Wako Pure Chemical Industries, Ltd.
- Comparative Example 3 contains 60% by mass of graphite and 10% by mass of talc as powder, 5% by mass of carboxymethylcellulose sodium salt (Sunrose F30MC, Nippon Paper Industries) as water-soluble polymer, and carbon black as pigment. was made to contain 25% by mass.
- Comparative Example 4 contained 60% by mass of graphite and 10% by mass of talc as powders, 5% by mass of carpolyacrylic acid as a cross-linking agent, and 25% by mass of carbon black as a pigment.
- Comparative Example 5 contains 55% by mass of graphite and 10% by mass of talc as powder, 5% by mass of starch and 5% by mass of polyvinyl alcohol as water-soluble polymer, and 25% by mass of carbon black as pigment. The composition contained
- Comparative Example 3 which does not contain a cross-linking agent as a raw material, the strength reduction rate was 52.5%, which was less than half of the bending strength immediately after production.
- Comparative Example 5 which does not contain a cross-linking agent, the strength reduction rate was 30.0%, which is 70% of the bending strength immediately after production.
- Comparative Example 4 which does not contain a water-soluble polymer as a raw material, the strength reduction rate was 66.9%, which is about 30% of the bending strength immediately after production.
- the water-soluble polymer was insolubilized by the cross-linking agent, so it is presumed that the reaction with moisture in the air was suppressed and the decrease in strength was suppressed. Furthermore, when a polymeric organic acid is used as the acid (Examples 10, 11, and 13 to 15), in addition to insolubilization of the water-soluble polymer by the acid, cross-linking with the linear portion of the polymer It is speculated that the water-soluble polymer is also stabilized.
- the present invention can be used as a non-baked pencil lead.
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Abstract
Description
(1)原材料
実施例1~実施例9並びに比較例1及び比較例2の非焼成鉛筆芯の原材料は、以下の組成とした。
実施例1の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを14質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF20LC、日本製紙)の、全体量に対する含有量は8質量%とした。また、酸としてのポリアクリル酸(アクアリックHL-415、日本触媒)の、全体量に対する含有量は8質量%とした。なお、サンローズF20LCの25℃における1%粘性は150~250mPa・mで、エーテル化度は0.55~0.65であった。
実施例2の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを14質量%とした。また、全体量に対するカルボキシメチルセルロースナトリウム塩(サンローズF10MC、日本製紙)の、含有量は8質量%とした。また、全体量に対する酸としてのポリアクリル酸(アクアリックHL-415、日本触媒)の、含有量は8質量%とした。なお、サンローズF10MCの25℃における1%粘性は50~150mPa・mで、エーテル化度は0.65~0.75であった。
実施例3の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを14質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)の、全体量に対する含有量は8質量%とした。また、酸としてのポリアクリル酸(アクアリックHL-415、日本触媒)の、全体量に対する含有量は8質量%とした。なお、サンローズF30MCの25℃における1%粘性は250~350mPa・mで、エーテル化度は0.65~0.75であった。
実施例4の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを14質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF120MC、日本製紙)の、全体量に対する含有量は8質量%とした。また、酸としてのポリアクリル酸(アクアリックHL-415、日本触媒)の、全体量に対する含有量は8質量%とした。なお、サンローズF120MCの25℃における1%粘性は850~1,200mPa・mで、エーテル化度は0.65~0.75であった。
実施例5の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを14質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF20HC、日本製紙)の、全体量に対する含有量は8質量%とした。また、酸としてのポリアクリル酸(アクアリックHL-415、日本触媒)の、全体量に対する含有量は8質量%とした。なお、サンローズF20HCの25℃における1%粘性は150~250mPa・mで、エーテル化度は0.80~1.00であった。
実施例6の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを14質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)の、全体量に対する含有量は8質量%とした。また、酸としてのポリアクリル酸(アクアリックAS-58、日本触媒)の、全体量に対する含有量は8質量%とした。
実施例7の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを20質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)の、全体量に対する含有量は5質量%とした。また、酸としてのクエン酸の、全体量に対する含有量は5質量%とした。
実施例8の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを20質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)の、全体量に対する含有量は5質量%とした。また、酸としてのシュウ酸の、全体量に対する含有量は5質量%とした。
実施例9の全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを20質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)の、全体量に対する含有量は5質量%とした。また、酸としての塩酸の、全体量に対する含有量は5質量%とした。
全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを22質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)の、全体量に対する含有量は5質量%とした。なお、比較例1では、酸は含有させなかった。
全体量に対する粉体の含有量は、黒鉛を70質量%、及び、タルクを14質量%とした。また、カルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)の、全体量に対する含有量は5質量%とした。なお、比較例2では、酸の替わりにポリアクリル酸ナトリウム(アクアリックDL-522)を用い、その全体量に対する含有量は8質量%とした。
上記の実施例1~実施例9並びに比較例1及び比較例2の各々の原材料を混練した後、プランジャー型、又はスクリュー型押出機で鉛筆芯の形状に押し出し成形し、非焼成鉛筆芯を得た。
上記の実施例1~実施例9並びに比較例1及び比較例2のそれぞれの非焼成鉛筆芯について、曲げ強度を測定した。具体的には、各非焼成鉛筆芯について、23℃の温度下、支点間40mmで3点曲げ強度を測定し、折損した際の圧力(単位:MPa)を求めた。測定は、製造直後と、製造から72時間、温度35℃及び湿度80%の環境下に放置した後との2回行った。その結果を、下記表1に示す。なお、下記表1中の「強度低下率」は、製造直後の曲げ強度をXとし、製造3日後の曲げ強度をYとしたとき、下記式(3)で算出される数値Z(%)である。
(4)原材料
実施例10~実施例18及び比較例3~比較例5の非焼成鉛筆芯の原材料は、以下の組成とした。なお、以下に示す質量%表示は、全体量に対する含有量である。
実施例10は、粉体として黒鉛を60質量%、水溶性高分子として澱粉(NSP-EA、日澱化学。以下同じ)を5質量%及びポリビニルアルコール(PVA-105、クラレ。以下同じ)を5質量%、架橋剤としての高分子有機酸としてポリアクリル酸(アクアリックHL-415、日本触媒。以下同じ)を5質量%含有し、他に顔料としてカーボンブラック(MA-100、三菱ケミカル。以下同じ)を25質量%含有する組成とした。
実施例11は、粉体として黒鉛を48質量%、水溶性高分子としてポリビニルアルコールを4質量%及びキサンタンガム(エコーガム、五協フード&ケミカル)を4質量%、架橋剤としてポリアクリル酸を4質量%含有し、他に顔料としてカーボンブラックを35質量%、金属石鹸としてステアリン酸石鹸(LI-ST、日東化成工業。以下同じ)を5質量%含有する組成とした。
実施例12は、粉体として黒鉛を47質量%、水溶性高分子として澱粉を6質量%及びポリビニルアルコールを6質量%、架橋剤としてポリアミドエポキシ(スミレーズレジン650、田岡化学工業)を6質量%含有し、他に顔料としてカーボンブラックを35質量%含有する組成とした。
実施例13は、粉体として黒鉛を45質量%及びタルクを10質量%、水溶性高分子としてカルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)を3質量%、澱粉を4質量%及びポリビニルアルコールを4質量%、架橋剤としてポリアクリル酸を4質量%含有し、他に顔料としてカーボンブラックを30質量%含有する組成とした。
実施例14は、粉体として黒鉛を45質量%及びタルクを10質量%、水溶性高分子としてカルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)を1質量%、澱粉を4質量%及びポリビニルアルコールを4質量%、架橋剤としてポリアクリル酸を4質量%含有し、他に顔料としてカーボンブラックを30質量%、セルロースナノファイバー(TC-02X、日本製紙)を2質量%含有する組成とした。
実施例15は、粉体として黒鉛を45質量%及びタルクを10質量%、水溶性高分子としてカルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)を1質量%、澱粉を4質量%及びポリビニルアルコールを4質量%、架橋剤としてポリアクリル酸を4質量%含有し、他に顔料としてカーボンブラックを30質量%、セルロース粉末(KCフロックW-400G、日本製紙)を2質量%含有する組成とした。
実施例16は、粉体として黒鉛を47質量%、水溶性高分子として澱粉を6質量%及びポリビニルアルコールを6質量%、架橋剤としてポリアクリルアミド(ハーマイドPY、ハリマ化成)を6質量%含有し、他にカーボンブラックを30質量%、金属石鹸としてステアリン酸石鹸を5質量%含有する組成とした。
実施例17は、粉体として黒鉛を50質量%及びタルクを6質量%、水溶性高分子としてカルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)を2質量%、澱粉を5質量%及びポリビニルアルコールを5質量%、架橋剤としてチタンアルコキシド(オルガチックスTA-10、マツモトファインケミカル)を2質量%含有し、他に顔料としてカーボンブラックを30質量%含有する組成とした。
実施例18は、粉体として黒鉛を50質量%及びタルクを6質量%、水溶性高分子としてカルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)を2質量%、澱粉を5質量%及びポリビニルアルコールを5質量%、架橋剤としてグリオキサール(試薬、富士フィルム和光純薬)を2質量%含有し、他に顔料としてカーボンブラックを30質量%含有する組成とした。
比較例3は、粉体として黒鉛を60質量%及びタルクを10質量%、水溶性高分子としてカルボキシメチルセルロースナトリウム塩(サンローズF30MC、日本製紙)を5質量%含有し、他に顔料としてカーボンブラックを25質量%含有する組成とした。
比較例4は、粉体として黒鉛を60質量%及びタルクを10質量%、架橋剤としてカルポリアクリル酸を5質量%含有し、他に顔料としてカーボンブラックを25質量%含有する組成とした。
比較例5は、粉体として黒鉛を55質量%及びタルクを10質量%、水溶性高分子として澱粉を5質量%及びポリビニルアルコールを5質量%含有し、他に顔料としてカーボンブラックを25質量%含有する組成とした。
上記の実施例10~実施例18及び比較例3~比較例5の各々の原材料を混練した後、プランジャー型、又はスクリュー型押出機で鉛筆芯の形状に押し出し成形し、非焼成鉛筆芯を得た。
上記の実施例10~実施例18及び比較例3~比較例5のそれぞれの非焼成鉛筆芯について、前記(3)と同様に曲げ強度を測定した。その結果を、下記表2に示す。
芯先端形状は、芯を角度17±1°の円錐状に削った上で、その先端を0.6±0.1mmの円錘台とし、先端形状がいびつでないことを確認した。このように先端を整えた鉛筆軸を専用固定治具で60°に保持した。そして、10mm/minの速度で荷重を加え、先端が欠けたときの荷重を測定し先端強度値とした。なお、荷重が0.7N以上急激に減少した場合、芯が欠けたと判断した。
JIS S 6006 8.7筆記濃度で規定されたレコード式の機械筆記測定を実施し、非焼成芯の機械筆記摩耗量を算出した。
JIS S 6006 8.7筆記濃度で規定された方法において、測色計を用いて画線筆記描線の濃度を測定した。
上記の先端強度、機械筆記摩耗量及び描線濃度の測定結果を、下記表3に示す。
Claims (9)
- 水溶性高分子と、架橋剤と、粉体とを含む非焼成鉛筆芯であって、
前記水溶性高分子はカルボキシメチルセルロース塩、澱粉、ポリビニルアルコール及びキサンタンガムから成る群から選ばれ、
前記架橋剤は酸、ポリアミドエポキシ、ポリアクリルアミド、チタンアルコキシド及びグリオキサールから成る群から選ばれることを特徴とする非焼成鉛筆芯。 - 前記水溶性高分子がカルボキシメチルセルロース塩であり、前記架橋剤が酸であることを特徴とする請求項1に記載の非焼成鉛筆芯。
- 前記酸は、有機酸であることを特徴とする請求項2に記載の非焼成鉛筆芯。
- 前記有機酸は、高分子酸であることを特徴とする請求項3に記載の非焼成鉛筆芯。
- 前記粉体は、体質材及び顔料のうち少なくとも一方であることを特徴とする請求項1から請求項4までのいずれか1項に記載の非焼成鉛筆芯。
- さらにセルロースを含むことを特徴とする請求項1から請求項5までのいずれか1項に記載の非焼成鉛筆芯。
- 成形後の芯体は多孔質であることを特徴とする請求項1から請求項6までのいずれか1項に記載の非焼成鉛筆芯。
- 水溶性高分子と、架橋剤と、粉体との混合物を調製する工程、及び、
前記混合物を芯体へ成形する工程を含み、
前記成形する工程において、前記水溶性高分子と、前記架橋剤とを反応させて架橋させることを特徴とする、非焼成鉛筆芯の製造方法。 - 前記水溶性高分子がカルボキシメチルセルロース塩であり、前記架橋剤が酸であることを特徴とする請求項8に記載の非焼成鉛筆芯の製造方法。
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JPH05331406A (ja) * | 1992-06-03 | 1993-12-14 | Mitsubishi Pencil Co Ltd | 非焼成色鉛筆芯とその製造方法 |
JPH11335617A (ja) | 1998-05-27 | 1999-12-07 | Sakura Color Prod Corp | 非焼成色鉛筆芯 |
JP2007138031A (ja) | 2005-11-18 | 2007-06-07 | Mitsubishi Pencil Co Ltd | 固形描画材及びその製造方法 |
JP4288618B2 (ja) * | 2006-09-15 | 2009-07-01 | 独立行政法人 日本原子力研究開発機構 | カルボキシメチルセルロースゲルの製造方法 |
JP2012052109A (ja) | 2010-08-05 | 2012-03-15 | Mitsubishi Pencil Co Ltd | 固形描画材及び固形描画具 |
JP2015209506A (ja) * | 2014-04-28 | 2015-11-24 | 三菱鉛筆株式会社 | 非焼成色鉛筆芯 |
CN108129914A (zh) * | 2017-12-08 | 2018-06-08 | 陕西科技大学 | 一种挠曲强度高的彩色铅笔芯及其制备方法 |
WO2020004390A1 (ja) * | 2018-06-25 | 2020-01-02 | 三菱鉛筆株式会社 | 非焼成鉛筆芯 |
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JPH05331406A (ja) * | 1992-06-03 | 1993-12-14 | Mitsubishi Pencil Co Ltd | 非焼成色鉛筆芯とその製造方法 |
JPH11335617A (ja) | 1998-05-27 | 1999-12-07 | Sakura Color Prod Corp | 非焼成色鉛筆芯 |
JP2007138031A (ja) | 2005-11-18 | 2007-06-07 | Mitsubishi Pencil Co Ltd | 固形描画材及びその製造方法 |
JP4288618B2 (ja) * | 2006-09-15 | 2009-07-01 | 独立行政法人 日本原子力研究開発機構 | カルボキシメチルセルロースゲルの製造方法 |
JP2012052109A (ja) | 2010-08-05 | 2012-03-15 | Mitsubishi Pencil Co Ltd | 固形描画材及び固形描画具 |
JP2015209506A (ja) * | 2014-04-28 | 2015-11-24 | 三菱鉛筆株式会社 | 非焼成色鉛筆芯 |
CN108129914A (zh) * | 2017-12-08 | 2018-06-08 | 陕西科技大学 | 一种挠曲强度高的彩色铅笔芯及其制备方法 |
WO2020004390A1 (ja) * | 2018-06-25 | 2020-01-02 | 三菱鉛筆株式会社 | 非焼成鉛筆芯 |
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