CN118165577A - Erasable answer ink coated on writing paper - Google Patents
Erasable answer ink coated on writing paper Download PDFInfo
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- CN118165577A CN118165577A CN202211536742.7A CN202211536742A CN118165577A CN 118165577 A CN118165577 A CN 118165577A CN 202211536742 A CN202211536742 A CN 202211536742A CN 118165577 A CN118165577 A CN 118165577A
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- Prior art keywords
- agent
- ink
- erasable
- answer
- film forming
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 67
- 229920002635 polyurethane Polymers 0.000 claims abstract description 44
- 239000004814 polyurethane Substances 0.000 claims abstract description 44
- 239000000976 ink Substances 0.000 claims abstract description 32
- 229920000126 latex Polymers 0.000 claims abstract description 31
- 239000004816 latex Substances 0.000 claims abstract description 31
- 239000003086 colorant Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000839 emulsion Substances 0.000 claims abstract description 22
- 239000006229 carbon black Substances 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 8
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 8
- 239000003973 paint Substances 0.000 claims abstract description 6
- 239000000049 pigment Substances 0.000 claims abstract description 6
- 239000002174 Styrene-butadiene Substances 0.000 claims abstract description 5
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims abstract description 5
- 150000002825 nitriles Chemical class 0.000 claims abstract description 5
- 239000011115 styrene butadiene Substances 0.000 claims abstract description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 5
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol group Chemical group OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 60
- 239000004952 Polyamide Substances 0.000 claims description 41
- 229920002647 polyamide Polymers 0.000 claims description 41
- 239000002270 dispersing agent Substances 0.000 claims description 29
- 239000013008 thixotropic agent Substances 0.000 claims description 26
- 239000003906 humectant Substances 0.000 claims description 25
- 238000013329 compounding Methods 0.000 claims description 22
- 239000008367 deionised water Substances 0.000 claims description 21
- 229910021641 deionized water Inorganic materials 0.000 claims description 21
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 20
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 20
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 20
- 239000002518 antifoaming agent Substances 0.000 claims description 19
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 19
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 19
- KVNRLNFWIYMESJ-UHFFFAOYSA-N butyronitrile Chemical compound CCCC#N KVNRLNFWIYMESJ-UHFFFAOYSA-N 0.000 claims description 17
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 4
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 3
- 239000000600 sorbitol Substances 0.000 claims description 3
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract description 16
- 238000000576 coating method Methods 0.000 abstract description 16
- 239000000047 product Substances 0.000 description 21
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 description 18
- 229940083037 simethicone Drugs 0.000 description 18
- 238000002835 absorbance Methods 0.000 description 14
- 239000000203 mixture Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000004040 coloring Methods 0.000 description 5
- 239000013530 defoamer Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000004927 clay Substances 0.000 description 4
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000003359 percent control normalization Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- GWAKFAUFNNPZFE-UHFFFAOYSA-K trisodium 2-[4-[(2-amino-4-oxidophenyl)diazenyl]anilino]-5-[(1-amino-8-oxido-7-phenyldiazenyl-3,6-disulfonaphthalen-2-yl)diazenyl]benzenesulfonate Chemical compound NC1=C(C(=CC2=CC(=C(C(=C12)O)N=NC1=CC=CC=C1)S(=O)(=O)[O-])S(=O)(=O)[O-])N=NC1=CC(=C(C=C1)NC1=CC=C(C=C1)N=NC1=C(C=C(C=C1)O)N)S(=O)(=O)[O-].[Na+].[Na+].[Na+] GWAKFAUFNNPZFE-UHFFFAOYSA-K 0.000 description 1
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
- C09D11/16—Writing inks
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to erasable pen ink for recording and marking on writing paper, which is particularly suitable for coating erasable answer ink for answer filling. The paint comprises a film forming agent and a coloring agent, wherein the film forming agent is selected from one or more of styrene-butadiene latex, cis-isoprene latex, polyurethane emulsion and nitrile latex, the coloring agent is a dark pigment, and is selected from one or more of graphene oxide, carbon black, oxidized carbon black and direct black, and the balance is conventional auxiliary agent and water. Can be firmly attached to writing paper to form a dark color block, can not be level-dyed after being dried, can be erased if required, has no residue or little residue after being erased, can not cause machine misreading, and can meet the requirement of archival ink.
Description
Technical Field
The invention relates to erasable pen ink for recording and marking on writing paper, which is particularly suitable for coating erasable answer ink for answer filling.
Background
The existing filling method for answering questions on writing paper in the market mainly uses a 2B pencil to coat, so that the writing paper can be recognized by a cursor reader after being coated, and can be erased without being recognized by a machine when being coated by mistake. The requirements of national standards on the absorbance of 2B card-coated pencils are as follows: the absorbance after coating is larger than 0.38, and the absorbance of the existing 2B pencil is still only above and below a standard line even if the product is qualified, in the actual use process, the coloring concentration is unstable due to the influence of various factors such as the strength of the coloring concentration, the lead core performance, the angle of the pencil and the like, and a certain risk of machine reading errors caused by insufficient concentration exists. Repeated coating is often adopted to ensure the color concentration in the use of an examinee, so that a certain time is delayed, and color blocks after thick coating of a pencil are easy to be stained with other paper or other answer areas due to weak coloring, so that the risk of machine misreading is caused. That is, the current 2B pencil coating scheme has several operational problems:
① The color density of the coating is unstable, and the color density of the coated color lump can not reach the absorbance required by national standards due to the risks of manual filling and pencil quality control.
② The coated color lump has poor adhesion firmness, so after the color lump is coated densely, the coated color lump is rubbed against other paper or fingers and then is leveled to other options, and the risk of machine misrecognition is caused. The reason is that the coloring of the pencil depends on the viscosity of the clay to the paper, so that the clay on the upper layer only covers the clay on the lower layer after the coating is thick, and the pencil does not adhere to the paper, thus not generating adhesion.
③ The color lump is filled with a long time. Because the current filling method requires more time and effort for filling, the actual knowledge level of the examinee cannot be exerted.
④ The residue after wiping (hereinafter referred to as residual shadow) also causes that part of graphite permeates into the gaps of paper and cannot be erased by rubber due to the adhesion of clay, so that the residual shadow is erroneously recognized by a machine.
Besides, the answer sheet filling method can adopt a thermosensitive erasable ink pen: although the thermosensitive erasable ink pen can meet the requirements of color concentration, firmness and the like, the prior art cannot meet the requirements of ultraviolet irradiation resistance and long-time storage, so that the requirement of file storage is not met.
The problems that good adhesiveness can be maintained after coating and the coating ink can be easily erased during false coating are solved, and a plurality of documents for preparing coating ink by adopting a film forming agent are searched in domestic documents. Film formers are materials that form a coherent, continuous, uniform film on the surface of a substrate and may be referred to as film formers. For example, CN 103992693A-a high-performance easy-to-wipe ink and a preparation method thereof, or CN 108624122A-an environment-friendly high-concentration neutral ink paste and a preparation method thereof, CN 111117354A-water-based acrylic mark pen ink and a preparation method thereof, and the like, and most of the inventions are applied to the surface writing of black, white boards or hard and other special substrates, none of the inventions is applied to writing paper, and the problem of erasing residues and the problem of misidentification are not involved.
There are other inventions for solving the problem of erasure, such as the sheet of application CN03803153.1 on which an erasable print can be formed, which is a novel erasable printing-writing material made by conventional methods, whose surface can accept at least one type of dry erasable print, which can be erased by hand wiping with a piece of fibrous material or non-woven fabric, an erasing brush or any other gentle rubbing tool, without causing any change (erosion or abrasion) to said surface during the erasure process. The composition comprises a film former and a detackifier and is free of any coating pigments. Wherein the film former acts to reduce voids in the sheet support surface and the release agent acts to adjust the balance between printability and erasability. However, the method obviously cannot provide standard writing paper, and solves the problem of machine misrecognition caused by unfavorable erasure of answering questions of the test paper.
Disclosure of Invention
The invention aims to provide erasable answer ink coated on writing paper, which can be firmly adhered on the writing paper to form a dark color block, can not be level-dyed after being dried, can be erased if required, has no residue or little residue after being erased, and can not cause machine misreading. Further aims at resisting acid, alkalization, bleaching, organic solvent, ultraviolet ray and the like, and can meet the requirements of archival ink.
The erasable answer ink coated on the writing paper comprises a film forming agent and a coloring agent, wherein the film forming agent is one or two or more of styrene-butadiene latex, cis-isoprene latex, polyurethane emulsion and nitrile latex, the coloring agent is dark pigment and is one or more of graphene oxide, carbon black, oxidized carbon black and direct black, and the balance is conventional auxiliary agent and water.
The conventional auxiliary agents in the invention are auxiliary agents added for keeping a relatively good fluid state, and include dispersing agents, moisturizing agents, thixotropic agents, viscosity control agents and the like in a proper use range, or anti-settling agents, antifoaming agents and the like. One or several of the above types of auxiliary agents must be present in practice, and are not particularly limited based on the conventional invention.
Namely, the auxiliary agent comprises one or more of dispersing agent, humectant, thixotropic agent, anti-settling agent and defoaming agent, wherein the dispersing agent is preferably sodium dodecyl sulfate or sodium dodecyl benzene sulfonate or polyvinylpyrrolidone, the humectant is preferably glycerol or sorbitol, and the anti-settling agent is preferably one or more of polyamide or polyamide wax and cellulose.
The dark pigment refers to a colorant having a relatively high absorbance, and further includes dyes which can be used in inks and which do not chemically react with the above-mentioned film forming agents, such as direct black, etc., i.e., without limitation to the conventionally described pigments.
The ink can be used for writing on writing paper conforming to GB/T12654-2018 standard including paper with high quality standard (hereinafter referred to as writing paper), is easy to erase, and has no residue or little residue after being erased. The film forming agent is directly applied to the erasable answer pen, and the film forming agent can be erased by a conventional pvc rubber and a wear-resistant tpr rubber after being coated on writing paper, and has no residue or little residue after being erased, and cannot be level-dyed. The absorbance of the ink coated on the writing paper based on the embodiment of the invention is stable and is more than or equal to 0.5 no matter writing or card coating and one-time pressing is included, the absorbance is obviously better than about 0.38 of the absorbance of the identifiable color block of the commercial 2B answering pencil, and the residual absorbance after wiping is generally better than the absorbance of the commercial 2B answering pencil. Meanwhile, the problem that erasable answer ink can be tightly attached to paper and can be erased when needed is solved; meanwhile, the machine can not read by mistake when the machine is applied to answering questions. In addition, based on the test data of the embodiment, the color lump formed by the erasable answer ink provided by the invention is resistant to ultraviolet irradiation, resistant to dry, wet, acid and alkali environments, free from halation and the like when being soaked in water, and meets the requirements of archival ink.
The erasable answer ink can be used for writing or coating cards and comprises the identifiable color blocks formed by one-time pressing, and the identifiable color blocks are preferentially recommended to be formed by one-time pressing, so that one-time pressing is simple and convenient to operate, the color blocks conforming to the specified shape are formed by one-time pressing, convenience and rapidness are realized, and precious examination time can be saved for examinees.
Preferably, the erasable answer ink comprises, by weight, 60-90% of a film forming agent, 0.5-9% of a colorant, 0.1-3% of a dispersing agent, 0.5-10% of a humectant, 0.05-3% of a thixotropic agent, 1-15% of an anti-settling agent, 0.3-1.5% of a defoaming agent and the balance of deionized water.
It is further preferable that the film forming agent in the erasable answer ink is formed by compounding 8% -20% of polyurethane emulsion and 63% -70% of butyronitrile latex.
The above preferred inventive test data demonstrate that their associated performance indicators are more advantageous. The invention is further illustrated below in conjunction with examples, which are not intended to limit the scope of the invention.
Examples
Example 1
The composition comprises a film forming agent which is compounded by 10% of polyurethane emulsion and 65% of butyronitrile latex, a colorant which is 1.5% of carbon black CB, a dispersing agent which is compounded by 0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate, a 4% of glycerol humectant, a 0.05% of polyurethane thixotropic agent, an anti-settling agent which is compounded by 1% of polyamide and 10% of polyamide wax, a 0.5% of simethicone defoaming agent, and the balance of deionized water.
Example 2
8% Polyurethane emulsion, 63% butyronitrile latex and 4% styrene-butadiene latex are compounded to serve as a film forming agent, 1.5% direct black-17,0.5% polyvinylpyrrolidone and 2.5% sodium dodecyl benzene sulfonate are compounded to serve as a dispersing agent, 4% glycerol humectant, 0.05% polyurethane thixotropic agent, 1% polyamide and 10% polyamide wax are compounded to serve as an anti-settling agent, 0.5% simethicone defoaming agent and the balance is filled with deionized water.
Example 3
20% Polyurethane emulsion and 70% butyronitrile latex are compounded to be used as a film forming agent, the colorant is 1.5% carbon black CB,0.5% polyvinylpyrrolidone and 1.5% sodium dodecyl benzene sulfonate are compounded to be used as a dispersing agent, 1% glycerol humectant, 0.05% polyurethane thixotropic agent, 1% polyamide and 2% polyamide wax are compounded to be used as an anti-settling agent, 0.5% simethicone defoamer and the balance is filled with deionized water.
Example 4
The composition comprises a film forming agent which is compounded by 10% of polyurethane emulsion and 65% of butyronitrile latex, a colorant which is 1.5% of carbon black CB, a dispersing agent which is compounded by 0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl sulfate, a 4% of sorbitol humectant, a polyurethane thixotropic agent which is 0.05% of polyurethane thixotropic agent, an anti-settling agent which is compounded by 1% of polyamide and 10% of polyamide wax, a simethicone defoaming agent which is 0.5% of dimethyl silicone oil, and deionized water which is filled in balance.
Example 5
The paint comprises a film forming agent which is formed by compounding 10% of polyurethane emulsion, 40% of nitrile latex and 10% of natural latex, wherein the colorant is 1.5% of carbon black CB, a dispersing agent which is formed by compounding 0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate, a humectant which is 8% of glycerol, a thixotropic agent which is 0.05% of polyurethane, an anti-settling agent which is formed by compounding 5% of polyamide and 10% of polyamide wax, a foam killer which is 0.5% of simethicone, and the balance of the paint is filled with deionized water.
Example 6
The composition comprises a film forming agent which is formed by compounding 10% of polyurethane emulsion and 63.5% of nitrile latex, wherein the colorant is 3% of carbon black CB, a dispersing agent which is formed by compounding 0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate, a 4% of glycerol humectant, a 0.05% of polyurethane thixotropic agent, an anti-settling agent which is formed by compounding 1% of polyamide and 10% of polyamide wax, a 0.5% of simethicone defoaming agent and the balance of deionized water.
Example 7
The paint comprises a film forming agent which is formed by compounding 10% of polyurethane emulsion and 65% of butyronitrile latex, wherein the colorant is 1.5% of carbon black CB, a dispersing agent which is formed by compounding 0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate, a glycerol humectant which is 4% of the polyurethane, a polyurethane thixotropic agent which is 0.05% of the polyurethane thixotropic agent, an anti-settling agent which is formed by compounding 1% of polyamide, 9.5% of polyamide wax and 0.5% of methyl hydroxyethyl cellulose, a simethicone defoaming agent which is 0.5% of the dimethyl silicone oil defoaming agent, and deionized water which is used for filling the rest.
Example 8
The 10% polyurethane emulsion and 65% butyronitrile latex are compounded to be used as a film forming agent, the colorant is 1.5% oxidized carbon black CB,0.5% polyvinylpyrrolidone and 1.5% sodium dodecyl benzene sulfonate are compounded to be used as a dispersing agent, 4% glycerol humectant, 0.05% polyurethane thixotropic agent, 1% polyamide and 10% polyamide wax are compounded to be used as an anti-settling agent, 0.5% simethicone defoamer and the balance of the anti-settling agent is filled with deionized water.
Example 9
110% Polyurethane emulsion and 65% butyronitrile latex are compounded to be used as a film forming agent, the colorant is 1.5% graphene oxide, 0.5% polyvinylpyrrolidone and 1.5% sodium dodecyl benzene sulfonate are compounded to be used as a dispersing agent, 4% glycerol humectant, 0.05% polyurethane thixotropic agent, 1% polyamide and 10% polyamide wax are compounded to be used as an anti-settling agent, 0.5% simethicone defoamer and the balance of the anti-settling agent is filled with deionized water.
Example 10
The paint comprises a film forming agent and a dispersing agent, wherein the film forming agent is formed by compounding 10% of polyurethane emulsion and 65% of butyronitrile latex, the dispersing agent is formed by compounding 1.5% of graphene oxide, the dispersing agent is formed by compounding 0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl sulfate, the dispersing agent is formed by compounding 4% of glycerol humectant, the anti-settling agent is formed by compounding 0.05% of polyurethane thixotropic agent, the anti-settling agent is formed by compounding 1% of polyamide, 9.5% of polyamide wax and 0.5% of methyl hydroxyethyl cellulose, the anti-settling agent is formed by compounding 1.5% of dimethyl silicone oil defoaming agent, and the balance is filled with deionized water.
Example 11
The composition comprises a film forming agent which is formed by compounding 10% of polyurethane emulsion and 55% of butyronitrile latex, wherein the colorant is 9% of oxidized carbon black, a dispersing agent which is formed by compounding 0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate, a 4% of glycerol humectant, a 0.05% of polyurethane thixotropic agent, an anti-settling agent which is formed by compounding 15% of polyamide wax, a 0.5% of simethicone defoaming agent and the balance of deionized water. Example 12
The composition comprises 10% of polyurethane emulsion and 75% of butyronitrile latex which are compounded to form a film forming agent, wherein the colorant is 0.5% of direct black-22,0.3% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate which are compounded to form a dispersing agent, 4% of glycerol humectant, 3% of polyurethane thixotropic agent, 0.5% of polyamide and 0.5% of polyamide wax which are compounded to form an anti-settling agent, 0.5% of simethicone defoaming agent, and the balance of the anti-settling agent is filled with deionized water.
Example 13
The composition comprises 10% of polyurethane emulsion and 75% of butyronitrile latex, wherein the colorant is 0.5% of direct black-38,0.3% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate, the composition is used as a dispersing agent, 4% of glycerol humectant, 0.05% of polyurethane thixotropic agent, 0.5% of polyamide and 0.5% of polyamide wax are used as anti-settling agents, 0.5% of simethicone defoamer and the balance is filled with deionized water.
Example 14
The 10% polyurethane emulsion and 75% butyronitrile latex are compounded to be used as a film forming agent, the colorant is 0.5% direct black-168, 0.3% polyvinylpyrrolidone and 1.5% sodium dodecyl benzene sulfonate are compounded to be used as a dispersing agent, 4% glycerol humectant, 0.05% polyurethane thixotropic agent, 0.5% polyamide and 0.5% polyamide wax are compounded to be used as an anti-settling agent, 0.5% simethicone defoaming agent and the balance is filled with deionized water.
Example 15
The composition comprises 10% of polyurethane emulsion and 75% of butyronitrile latex, wherein the colorant is 0.5% of direct black-80,0.3% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate, the composition is used as a dispersing agent, 4% of glycerol humectant, 0.05% of polyurethane thixotropic agent, 0.5% of polyamide and 0.5% of polyamide wax are used as anti-settling agents, 0.6% of simethicone defoamer and the balance is filled with deionized water.
Example 16
65% Of cis-isoprene latex is used as a film forming agent, 1% of graphene oxide is used as a colorant, 0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate are compounded to be used as a dispersing agent, 4% of glycerol humectant, 0.05% of polyurethane thixotropic agent, 1% of polyamide and 9% of polyamide wax are compounded to be used as an anti-settling agent, 0.5% of simethicone defoaming agent, and the balance is filled with deionized water.
Example 17
65% Of styrene-butadiene latex is used as a film forming agent, 1% of graphene oxide is used as a colorant, 0.1% of sodium dodecyl benzene sulfonate is compounded as a dispersing agent, 10% of glycerol humectant, 0.05% of polyurethane thixotropic agent, 1% of polyamide and 14% of polyamide wax are compounded as an anti-settling agent, 0.5% of simethicone defoaming agent, and the balance is filled with deionized water.
Example 18
75% Of butyronitrile latex is used as a film forming agent, the colorant is 1% of carbon black CB,0.5% of polyvinylpyrrolidone and 1.5% of sodium dodecyl benzene sulfonate are compounded to be used as a dispersing agent, 1% of glycerol humectant, 0.05% of polyurethane thixotropic agent, 1% of polyamide and 9% of polyamide wax are compounded to be used as an anti-settling agent, 0.3% of simethicone defoaming agent, and the balance is filled with deionized water.
Example 19
60% Polyurethane emulsion is used as a film forming agent, a colorant is 1% graphene oxide, 0.5% polyvinylpyrrolidone and 1.5% sodium dodecyl benzene sulfonate are compounded to be used as a dispersing agent, 1% glycerol humectant, 0.05% polyurethane thixotropic agent, 1% polyamide and 9% polyamide wax are compounded to be used as an anti-settling agent, 1.5% simethicone defoaming agent and the balance is filled with deionized water.
The performance and effect achieved by the erasable answer ink applied to writing paper in the above examples and the corresponding index of the comparative example are shown in table 1. The coating on writing paper is carried out according to the GB/T26698-2011 standard, wherein the writing performance adopts an index of absorbance, and the absorbance is taken as a value in a test wavelength range (480 nm) by an ultraviolet-visible-near infrared spectrophotometer. The method for testing the color fastness index is to draw a stitch with the area smaller than 10cm x 10cm on paper, cover the stitch with another piece of cover paper made of the same material, apply a weight with the weight of 2kg above the stitch position, ensure that the cover paper and the weight do not move, withdraw the paper, and the stitch on the paper is not damaged. The test method of the quick-drying performance index comprises the following steps: if yes/no is less than or equal to 30 seconds, the covering paper has no ink marks. The test paper has the advantages of ethanol resistance, hydrochloric acid resistance, ammonia water resistance, bleaching resistance and ultraviolet resistance, and is detected according to the GB-T37853-2019 of 7.7, 7.11, 7.12, 7.13, 7.14 and 7.15.
TABLE 1
| Sequence number | Examples and comparative examples | Writing performance (absorbance) | Fastness to coloring | Quick drying performance | Erasing Property (absorbance) | Archive preservation performance |
| Control group 1 | Square answering pen for A brand of commercial products | 40.92% | Color block is turned on by halation | 20.81% | ||
| Control group 2 | Commercial B brand 2B square answering pen | 36.04 | Color block is turned on by halation | 22.35% | ||
| Control group 3 | Examination paper (uncoated) | 10.82% | ||||
| 1 | Case 1 | 60.10% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 18.98% | Qualified product |
| 2 | Case 2 | 57.73% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 20.23% | Qualified product |
| 3 | Case 3 | 60.38% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 20.12% | Qualified product |
| 4 | Case 4 | 59.86% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 20.67% | Qualified product |
| 5 | Case 5 | 59.71% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.72% | Qualified product |
| 6 | Case 6 | 71.67% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 20.36% | Qualified product |
| 7 | Case 7 | 60.53% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.22% | Qualified product |
| 8 | Case 8 | 59.76% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.77% | Qualified product |
| 9 | Case 9 | 53.58% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.67% | Qualified product |
| 10 | Case 10 | 52.52% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.94% | Qualified product |
| 11 | Case 11 | 83.35% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 20.55% | Qualified product |
| 12 | Case 12 | 50.12% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 20.43% | Qualified product |
| 13 | Case 13 | 51.83% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 17.43% | Qualified product |
| 14 | Case 14 | 52.63% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.43% | Qualified product |
| 15 | Case 15 | 51.36% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.56% | Qualified product |
| 16 | Case 16 | 55.31% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.84% | Qualified product |
| 17 | Case 17 | 54.63% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 19.36% | Qualified product |
| 18 | Case 18 | 57.46% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 20.11% | Qualified product |
| 19 | Case 19 | 53.34% | The color lump is not damaged, the blurring is not generated, and the color concentration is not changed | Is that | 20.64% | Qualified product |
Claims (5)
1. An erasable answer ink coated on writing paper is characterized in that: the paint comprises a film forming agent and a coloring agent, wherein the film forming agent is selected from one or more of styrene-butadiene latex, cis-isoprene latex, polyurethane emulsion and nitrile latex, the coloring agent is a dark pigment, and is selected from one or more of graphene oxide, carbon black, oxidized carbon black and direct black, and the balance is conventional auxiliary agent and water.
2. The writing paper coated erasable answer ink of claim 1, wherein: the conventional auxiliary agent comprises one or more of dispersing agent, humectant, thixotropic agent, anti-settling agent and defoaming agent, wherein the dispersing agent is selected from sodium dodecyl sulfate or sodium dodecyl benzene sulfonate or polyvinylpyrrolidone, the humectant is selected from glycerol or sorbitol, and the anti-settling agent is selected from one or more of polyamide or polyamide wax and cellulose.
3. The writing paper coated erasable answer ink of claim 1 or 2, wherein: comprises (by weight ratio) film forming agent 60-90%, colorant 0.5-9%, dispersant 0.1-3%, humectant 0.5-10%, thixotropic agent 0.05-3%, anti-settling agent 1-15%, defoaming agent 0.3-1.5%, and deionized water.
4. The writing paper coated erasable answer ink of claim 1 or 2, wherein: the film forming agent is formed by compounding 8-20% of polyurethane emulsion and 63-70% of butyronitrile latex.
5. A writing paper coated erasable answer ink as defined in claim 3, wherein: the film forming agent is formed by compounding 8-20% of polyurethane emulsion and 63-70% of butyronitrile latex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211536742.7A CN118165577A (en) | 2022-12-02 | 2022-12-02 | Erasable answer ink coated on writing paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211536742.7A CN118165577A (en) | 2022-12-02 | 2022-12-02 | Erasable answer ink coated on writing paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118165577A true CN118165577A (en) | 2024-06-11 |
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ID=91357095
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211536742.7A Pending CN118165577A (en) | 2022-12-02 | 2022-12-02 | Erasable answer ink coated on writing paper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118165577A (en) |
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2022
- 2022-12-02 CN CN202211536742.7A patent/CN118165577A/en active Pending
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