CN114164706A - Thermal paper and preparation method thereof - Google Patents
Thermal paper and preparation method thereof Download PDFInfo
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- CN114164706A CN114164706A CN202010948069.2A CN202010948069A CN114164706A CN 114164706 A CN114164706 A CN 114164706A CN 202010948069 A CN202010948069 A CN 202010948069A CN 114164706 A CN114164706 A CN 114164706A
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- thermal paper
- coating
- top coating
- paper
- coating liquid
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 168
- 239000011248 coating agent Substances 0.000 claims abstract description 166
- 239000010410 layer Substances 0.000 claims abstract description 49
- 239000011241 protective layer Substances 0.000 claims abstract description 42
- 239000000049 pigment Substances 0.000 claims abstract description 39
- 229920003023 plastic Polymers 0.000 claims abstract description 39
- 239000004033 plastic Substances 0.000 claims abstract description 39
- 239000000853 adhesive Substances 0.000 claims abstract description 30
- 230000001070 adhesive effect Effects 0.000 claims abstract description 30
- 239000000945 filler Substances 0.000 claims abstract description 30
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 25
- 239000000314 lubricant Substances 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 116
- 239000006185 dispersion Substances 0.000 claims description 77
- 239000002981 blocking agent Substances 0.000 claims description 29
- 238000001035 drying Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 16
- 125000003709 fluoroalkyl group Chemical group 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 34
- 229920002451 polyvinyl alcohol Polymers 0.000 description 34
- 239000007787 solid Substances 0.000 description 30
- 229920000126 latex Polymers 0.000 description 23
- 239000004816 latex Substances 0.000 description 23
- 239000000203 mixture Substances 0.000 description 20
- 239000002245 particle Substances 0.000 description 18
- 238000009413 insulation Methods 0.000 description 15
- KZTYYGOKRVBIMI-UHFFFAOYSA-N diphenyl sulfone Chemical compound C=1C=CC=CC=1S(=O)(=O)C1=CC=CC=C1 KZTYYGOKRVBIMI-UHFFFAOYSA-N 0.000 description 14
- 238000006136 alcoholysis reaction Methods 0.000 description 13
- 238000002156 mixing Methods 0.000 description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 12
- 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 10
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 10
- 239000011247 coating layer Substances 0.000 description 9
- 238000007639 printing Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 229920002472 Starch Polymers 0.000 description 8
- 239000008107 starch Substances 0.000 description 8
- 235000019698 starch Nutrition 0.000 description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 7
- 238000000227 grinding Methods 0.000 description 7
- -1 azapyridine Chemical compound 0.000 description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 6
- 235000013539 calcium stearate Nutrition 0.000 description 6
- 239000008116 calcium stearate Substances 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 6
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 238000007651 thermal printing Methods 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 5
- ZTILAOCGFRDHBH-UHFFFAOYSA-N 4-(4-propan-2-yloxyphenyl)sulfonylphenol Chemical compound C1=CC(OC(C)C)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 ZTILAOCGFRDHBH-UHFFFAOYSA-N 0.000 description 4
- JSUKRBMPOXGCPR-UHFFFAOYSA-N 4-(benzenesulfonyl)phenol Chemical compound C1=CC(O)=CC=C1S(=O)(=O)C1=CC=CC=C1 JSUKRBMPOXGCPR-UHFFFAOYSA-N 0.000 description 4
- 239000005995 Aluminium silicate Substances 0.000 description 4
- ZAFNJMIOTHYJRJ-UHFFFAOYSA-N Diisopropyl ether Chemical compound CC(C)OC(C)C ZAFNJMIOTHYJRJ-UHFFFAOYSA-N 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 4
- 229920000881 Modified starch Polymers 0.000 description 4
- 239000004368 Modified starch Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000002174 Styrene-butadiene Substances 0.000 description 4
- 235000012211 aluminium silicate Nutrition 0.000 description 4
- YOALFLHFSFEMLP-UHFFFAOYSA-N azane;2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctanoic acid Chemical compound [NH4+].[O-]C(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F YOALFLHFSFEMLP-UHFFFAOYSA-N 0.000 description 4
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 235000019426 modified starch Nutrition 0.000 description 4
- 239000011115 styrene butadiene Substances 0.000 description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 description 4
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 4
- 238000004078 waterproofing Methods 0.000 description 4
- PICKZMGDVSSGSC-UHFFFAOYSA-N 2-(2-phenoxyethoxy)ethoxybenzene Chemical compound C=1C=CC=CC=1OCCOCCOC1=CC=CC=C1 PICKZMGDVSSGSC-UHFFFAOYSA-N 0.000 description 3
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 3
- IBVAQQYNSHJXBV-UHFFFAOYSA-N adipic acid dihydrazide Chemical compound NNC(=O)CCCCC(=O)NN IBVAQQYNSHJXBV-UHFFFAOYSA-N 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 229940015043 glyoxal Drugs 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- PNKZBZPLRKCVLI-UHFFFAOYSA-N (2-methylpropan-2-yl)oxybenzene Chemical compound CC(C)(C)OC1=CC=CC=C1 PNKZBZPLRKCVLI-UHFFFAOYSA-N 0.000 description 2
- LIZLYZVAYZQVPG-UHFFFAOYSA-N (3-bromo-2-fluorophenyl)methanol Chemical compound OCC1=CC=CC(Br)=C1F LIZLYZVAYZQVPG-UHFFFAOYSA-N 0.000 description 2
- OSWWFLDIIGGSJV-UHFFFAOYSA-N 1,4-diphenylbutane-1,4-dione Chemical compound C=1C=CC=CC=1C(=O)CCC(=O)C1=CC=CC=C1 OSWWFLDIIGGSJV-UHFFFAOYSA-N 0.000 description 2
- UWDMKTDPDJCJOP-UHFFFAOYSA-N 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-ium-4-carboxylate Chemical compound CC1(C)CC(O)(C(O)=O)CC(C)(C)N1 UWDMKTDPDJCJOP-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 238000007754 air knife coating Methods 0.000 description 2
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007766 curtain coating Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000009775 high-speed stirring Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- JGTNAGYHADQMCM-UHFFFAOYSA-N perfluorobutanesulfonic acid Chemical compound OS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F JGTNAGYHADQMCM-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- XJUNLJFOHNHSAR-UHFFFAOYSA-J zirconium(4+);dicarbonate Chemical compound [Zr+4].[O-]C([O-])=O.[O-]C([O-])=O XJUNLJFOHNHSAR-UHFFFAOYSA-J 0.000 description 2
- 230000035515 penetration Effects 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/826—Paper comprising more than one coating superposed two superposed coatings, the first applied being pigmented and the second applied being non-pigmented
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/28—Colorants ; Pigments or opacifying agents
Abstract
The application provides a thermal paper and a preparation method thereof, wherein the thermal paper comprises: a paper substrate layer; the top coating is arranged on the paper base layer and comprises filler, an adhesive, a color developing agent, a sensitizer, a leuco dye, a cross-linking agent and a lubricant, wherein the filler comprises a hollow plastic pigment, and the mass ratio of the hollow plastic pigment in the top coating is not less than 10%; and the protective layer is arranged on the top coating. The application provides a thermal paper has also guaranteed the planarization of paper when promoting its heat-proof quality, and can also reduce corresponding production processes to the energy saving consumes, thereby has good environmental protection characteristic.
Description
Technical Field
The application relates to the technical field of thermal paper, in particular to thermal paper and a preparation method thereof.
Background
In recent years, as the market of thermal paper has been continuously increased, the application range of the thermal paper has been continuously increased, wherein the application range of the thermal paper can be seen from the most common entertainment tickets such as cash receipts, traffic tickets, movie tickets and the like, to logistics labels used for express delivery, common food labels in supermarkets, and even entertainment lottery tickets, invoices and the like of securities.
As the application level of thermal paper increases, it is also required to gradually improve the protection performance, and among them, the three-proof thermal paper with high protection performance has also been widely used.
Among them, the common three-proofing thermal paper in the market usually contains three coatings with different functionalities: the coating comprises a bottom coating (or called precoating and a heat insulation layer), a top coating (or called heat sensitive layer and a color development layer), and a protective layer (or called protective layer and top coating). The bottom coating provides certain heat insulation performance besides the smoothness of the surface of the finishing base material so as to avoid the loss of heat energy; the top coating layer mainly receives heat energy to generate chemical reaction so as to achieve the color performance, and the protective layer provides various different protective performances according to the requirements.
However, in order to effectively improve the protective performance, the three-proof paper coating process at least needs to coat the base paper more than three times (the conventional common thermal paper only comprises a bottom coating and a surface coating), so that not only the number of processes is increased, but also the consumption of corresponding energy is improved, and the three-proof paper is not environment-friendly.
Disclosure of Invention
The application provides thermal paper and a preparation method thereof, which aim to solve the problems that the existing thermal paper has more processes, so that the corresponding energy consumption is more and the environmental protection is not good.
In order to solve the above technical problem, the present application provides a thermal paper, wherein the thermal paper comprises: a paper substrate layer; the top coating is arranged on the paper base layer and comprises filler, an adhesive, a color developing agent, a sensitizer, a leuco dye, a cross-linking agent and a lubricant, wherein the filler comprises a hollow plastic pigment, and the mass ratio of the hollow plastic pigment in the top coating is not less than 10%; and the protective layer is arranged on the top coating.
Wherein the mass ratio of the adhesive in the top coating is not less than 15%.
Wherein the mass ratio of the cross-linking agent in the top coating is not less than 7%.
Wherein, the protective layer is made of a blocking agent containing carbonized fluoroalkyl, and the surface tension of the blocking agent is less than or equal to 30 mN/m.
Wherein the blocking agent is a C3 and/or C4 waterproof agent.
Wherein the mass percentage of the blocking agent in the protective layer is not less than 5%.
Wherein the porosity of the hollow plastic pigment is not less than 50%.
In order to solve the above technical problem, the present application adopts another technical solution: provided is a method for preparing thermal paper, wherein the method for preparing the thermal paper comprises the following steps: preparing a top coating liquid by adopting a filler, an adhesive, a developer dispersion liquid, a sensitizer dispersion liquid, a leuco dye dispersion liquid, a cross-linking agent and a lubricant in a set ratio, and preparing a protective layer coating liquid; coating the prepared surface coating liquid on a paper base layer and drying; wherein the filler comprises a hollow plastic pigment, and the mass ratio of the hollow plastic pigment in the dried coating liquid of the top coating is not less than 10%; and coating the prepared protective layer coating liquid on the dried surface coating liquid and drying to obtain the thermal sensitive paper.
The top coating liquid comprises an adhesive and a cross-linking agent, wherein the adhesive accounts for not less than 15% of the weight of the top coating liquid, and the cross-linking agent accounts for not less than 7% of the weight of the top coating liquid after being dried.
Wherein the protective layer coating liquid comprises a blocking agent containing carbonized fluoroalkyl, and the blocking agent is a C3 and/or C4 waterproof agent.
The beneficial effect of this application is: in contrast to the prior art, the present application provides thermal paper comprising: a paper substrate layer; the top coating is arranged on the paper base layer and comprises filler, an adhesive, a color developing agent, a sensitizer, a leuco dye, a cross-linking agent and a lubricant, wherein the filler comprises a hollow plastic pigment, and the mass ratio of the hollow plastic pigment in the top coating is not less than 10%; the protective layer sets up on the top-coat layer to add cavity plastic pigment in the top-coat layer through at the temperature sensing paper, make the planarization of paper also guaranteed when promoting the heat-proof quality of temperature sensing paper, and can also reduce corresponding production processes, with the energy saving consumption, thereby have good environmental protection characteristic.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a first embodiment of thermal paper according to the present application;
fig. 2 is a schematic flow chart of a first embodiment of a method for producing thermal paper according to the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The present application will be described in detail with reference to the accompanying drawings and examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a thermal paper according to a first embodiment of the present application.
In the present embodiment, a thermal paper 1 is provided, where the thermal paper 1 may be applied to entertainment tickets such as cashier tickets, transportation tickets, movie tickets, etc., logistics labels used in express delivery, food labels commonly used in supermarkets, and even printing papers for entertainment tickets, invoices, etc. of securities, so that after the thermal paper 1 is printed according to a preset temperature and a set pattern or text by using a corresponding thermal printing device, the set pattern or text with a corresponding color is displayed on the thermal paper 1. Of course, in other embodiments, the thermal paper 1 may also be applied in other application scenarios, and the embodiment is not limited thereto.
Specifically, the thermal paper 1 includes: a paper base layer 10, a top coat layer 20 and a protective layer 30.
The top coat layer 20 is disposed on the paper substrate 10, the protective layer 30 is further disposed on the top coat layer 20, and the top coat layer 20 is made of a material specifically including a filler, an adhesive, a developer, a sensitizer, a leuco dye, a cross-linking agent and a lubricant, wherein the filler further includes a hollow plastic pigment, and the hollow plastic pigment accounts for not less than 10% of the top coat layer. Preferably, the mass proportion of the hollow plastic pigment in the top coat layer is not less than 12%.
Understandably, in order to ensure good printing quality of the thermal paper 1, the filler of the top coating 20 of the thermal paper 1 is added with hollow plastic pigment, so that poor printing, unclear pictures and texts of the thermal paper 1 and even loss of a thermal printing function can be effectively avoided, and the smoothness of the paper can be ensured while the heat insulation performance of the thermal paper is improved. The strength of the top coating 20 is weakened due to the increase of the using amount of the hollow plastic pigment, so that an adhesive and a cross-linking agent are further added into the top coating 20 of the thermal paper 1, and the top coating can be correspondingly coated to generate a cross-linking reaction in the drying process, so that the bonding strength of the top coating 20 is effectively improved, and meanwhile, the compactness of the top coating 20 is increased, so that the top coating achieves a certain protection property.
Optionally, the mass fraction of the adhesive in the topcoat 20 is not less than 15%.
Optionally, the mass fraction of the cross-linking agent in the topcoat 20 is not less than 7%.
Optionally, the porosity of the hollow plastic pigment is not less than 50% to enable better printing effect.
Optionally, the top coat 20 is prepared by mixing 15-40% of filler, 15-30% of adhesive, 10-35% of developer dispersion, 10-35% of sensitizer dispersion, 5-20% of leuco dye dispersion, 7-12% of cross-linking agent and 3-10% of lubricant at high speed to obtain a top coat coating liquid with a solid content of 20-50%, coating the top coat coating liquid on the paper substrate 10, and drying.
The percentage of each component in the top coating liquid is specifically the mass ratio of each component in the total top coating liquid, and the sum of the percentages of the above components is 100%, and the percentage of each component specifically needs to satisfy the range given above, which is not limited in the present application.
Optionally, the adhesive is one or more of modified latex, modified polyvinyl alcohol and modified starch.
Optionally, the modified latex is one or more of acrylic latex, styrene-butadiene latex, styrene-acrylic latex and epoxy acrylic latex; the modified polyvinyl alcohol is one or a mixture of more of partially alcoholysis modified polyvinyl alcohol with high polymerization degree and completely alcoholysis modified polyvinyl alcohol; the modified starch is one or more of acidified starch, esterified starch and phosphated starch.
Optionally, the cross-linking agent is one or more of adipic acid dihydrazide, isocyanate, glyoxal, urea-formaldehyde resin, azapyridine, zirconium carbonate, and epichlorohydrin.
Optionally, the lubricant is one or more of zinc stearate and calcium stearate.
Optionally, the developer dispersion is a mixture of 80-95% developer and 5-20% dispersant, and the mixture is ground by a grinder to obtain a homogeneous stable dispersion solution with a particle size of 0.4-1.2 μm and a solid content of 40-50%. And the color developing agent is one of 4-hydroxy diphenyl sulfone isopropyl ether, dihydroxy diphenyl sulfone, 4-hydroxy-4' -isopropoxy diphenyl sulfone and 2, 4-diphenyl sulfone phenol.
Optionally, the sensitizer dispersion is a mixture of 80-95% of sensitizer and 5-20% of dispersant, and the mixture is ground by a grinder to obtain a homogeneous stable dispersion solution with a particle size of 0.8-2.0 μm and a solid content of 40-50%. The sensitizer is one or more of 1, 2-dibenzoyl ethane, diphenyl sulfone, diethylene glycol diphenyl ether and dimethyl phenoxy ethane.
Optionally, the leuco dye dispersion is a mixture of 80-95% leuco dye and 5-20% dispersant, and the obtained homogeneous stable dispersion solution with particle size of 0.5-1.5 μm and solid content of 40-50% is ground by a grinder. The leuco dye is one or a mixture of 2-anilino-3-methyl-6-aminofluoran, 3-N-isoamyl-N-ethylamino-6-methyl-7-phenylaminofluoran, 3- (N-ethyl-N-isoamyl) amino-6-methyl-7-phenylaminofluoran, 3- (N-ethyl-4-toluidino) -6-methyl-7-phenylaminofluoran and crystal violet lactone.
The material of the protective layer 30 includes filler, adhesive, blocking agent and lubricant with a predetermined mass ratio.
Optionally, the protection layer 30 is made of a blocking agent containing carbonized fluoroalkyl, wherein the surface tension of the blocking agent is less than or equal to 30 mN/m.
Optionally, the mass ratio of the blocking agent in the protective layer 30 is not less than 5% to ensure that the thermal paper has good protective performance, and the mass ratio of the blocking agent in the protective layer is not more than 20% to avoid causing the problem of coating separation due to uneven dispersion of the coating.
Optionally, the protective layer 30 is obtained by mixing 35-50% of filler, 30-50% of adhesive, 5-20% of blocking agent and 3-10% of lubricant at high speed to form a protective layer coating liquid with a solid content of 15-30%, coating the protective layer coating liquid on the top coating 20, and drying.
Optionally, the filler is one or more of light calcium carbonate, natural kaolin, hollow plastic pigment, and silica.
Optionally, the adhesive is one or more of modified latex and modified polyvinyl alcohol; the modified latex can be one or a mixture of epoxy acrylic latex, styrene-butadiene latex and styrene-acrylic latex; the modified polyvinyl alcohol can be one or a mixture of partial alcoholysis modified polyvinyl alcohol and complete alcoholysis modified polyvinyl alcohol.
Optionally, the blocking agent is a C3 and C4 (perfluorobutyl sulfonate) waterproofing agent which does not contain perfluorooctanoic acid ammonium salt or perfluorooctane sulfonyl compounds, so that the blocking agent can replace a C8 and C6 waterproofing agent which contains perfluorooctanoic acid ammonium salt, thereby effectively improving the waterproof and oil-proof performance and reducing the environmental pollution.
Optionally, the lubricant is one or more of zinc stearate and calcium stearate.
It can be understood that, because the thermal insulation filler is added in the top coat 20 of the thermal paper 1 to replace the thermal insulation performance provided by the bottom coat in the conventional common thermal paper, the thermal paper 1 can omit the preparation of the corresponding bottom coat compared with the conventional common thermal paper, thereby effectively saving the corresponding energy consumption. However, because the thermal paper 1 lacks a bottom coating with a thermal insulation function, the top coating 20 of the thermal paper 1 has a thermal insulation function to ensure the thermal printing performance of the thermal paper 1, and if the thermal insulation layer (bottom coating) is simply removed, poor printing, unclear pictures and texts of the thermal paper 1, and even the thermal printing function is lost, so that in order to ensure the printing quality of the thermal paper 1, the top coating 20 is added with a hollow plastic pigment with high porosity, so that the thermal insulation performance of the thermal paper 1 is improved, and the smoothness of the paper is also ensured.
Further, the strength of the top coat 20 is weakened due to the increase of the amount of the hollow plastic pigment in the top coat 20, and the top coat 20 of the thermal paper 1 is further added with an adhesive and a cross-linking agent so as to be capable of generating a cross-linking reaction in the corresponding coating and drying process, thereby effectively improving the bonding strength of the top coat 20 and simultaneously increasing the compactness of the top coat 20, so that the top coat 20 achieves a certain protection property.
And because the added blocking agent in the protective layer 30 is a structure containing carbonized fluoroalkyl, the carbonized fluoroalkyl has extremely low surface tension (less than or equal to 30mN/m), so that the liquid penetration can be effectively prevented, and the protective performance of the thermal paper 1 can be further improved.
Based on the general inventive concept, the present application also provides a method for preparing thermal paper, please refer to fig. 2, and fig. 2 is a schematic flow chart of a first embodiment of the method for preparing thermal paper of the present application. The implementation mode comprises the following steps:
s21: the surface coating liquid is prepared by adopting the filler, the adhesive, the developer dispersion liquid, the sensitizer dispersion liquid, the leuco dye dispersion liquid, the cross-linking agent and the lubricant in a set ratio, and the protective layer coating liquid is prepared.
Specifically, after a paper base layer is provided, a top coating liquid is prepared by adopting a filler, an adhesive, a developer dispersion liquid, a sensitizer dispersion liquid, a leuco dye dispersion liquid, a cross-linking agent and a lubricant in a set ratio, and a corresponding protective layer coating liquid is prepared at the same time.
In a specific embodiment, the top coating liquid is prepared by adopting 15-40% of filler, 15-30% of adhesive, 10-35% of developer dispersion liquid, 10-35% of sensitizer dispersion liquid, 5-20% of leuco dye dispersion liquid, 7-12% of cross-linking agent and 3-10% of lubricant, and fully mixing the mixture through high-speed stirring to form a mixed solution with the solid content of 20-50%.
The percentage of each component in the top coating liquid is specifically the mass ratio of each component in the total top coating liquid, and the sum of the percentages of the above components is 100%, and the percentage of each component specifically needs to satisfy the range given above, which is not limited in the present application.
Optionally, the adhesive is one or more of modified latex, modified polyvinyl alcohol and modified starch.
Optionally, the modified latex is one or more of acrylic latex, styrene-butadiene latex, styrene-acrylic latex and epoxy acrylic latex; the modified polyvinyl alcohol is one or a mixture of more of partially alcoholysis modified polyvinyl alcohol with high polymerization degree and completely alcoholysis modified polyvinyl alcohol; the modified starch is one or more of acidified starch, esterified starch and phosphated starch.
Optionally, the cross-linking agent is one or more of adipic acid dihydrazide, isocyanate, glyoxal, urea-formaldehyde resin, azapyridine, zirconium carbonate, and epichlorohydrin.
Optionally, the lubricant is one or more of zinc stearate and calcium stearate.
Optionally, the developer dispersion is a mixture of 80-95% developer and 5-20% dispersant, and the mixture is ground by a grinder to obtain a homogeneous stable dispersion solution with a particle size of 0.4-1.2 μm and a solid content of 40-50%. And the color developing agent is one of 4-hydroxy diphenyl sulfone isopropyl ether, dihydroxy diphenyl sulfone, 4-hydroxy-4' -isopropoxy diphenyl sulfone and 2, 4-diphenyl sulfone phenol.
Optionally, the sensitizer dispersion is a mixture of 80-95% of sensitizer and 5-20% of dispersant, and the mixture is ground by a grinder to obtain a homogeneous stable dispersion solution with a particle size of 0.8-2.0 μm and a solid content of 40-50%. The sensitizer is one or more of 1, 2-dibenzoyl ethane, diphenyl sulfone, diethylene glycol diphenyl ether and dimethyl phenoxy ethane.
Optionally, the leuco dye dispersion is a mixture of 80-95% leuco dye and 5-20% dispersant, and the obtained homogeneous stable dispersion solution with particle size of 0.5-1.5 μm and solid content of 40-50% is ground by a grinder. The leuco dye is one or a mixture of 2-anilino-3-methyl-6-aminofluoran, 3-N-isoamyl-N-ethylamino-6-methyl-7-phenylaminofluoran, 3- (N-ethyl-N-isoamyl) amino-6-methyl-7-phenylaminofluoran, 3- (N-ethyl-4-toluidino) -6-methyl-7-phenylaminofluoran and crystal violet lactone.
Optionally, the protective layer coating liquid is prepared by adopting a blocking agent containing carbonized fluorine-containing alkyl, wherein the surface tension of the blocking agent is less than or equal to 30 mN/m.
In another embodiment, the protective layer coating liquid is obtained by adopting 35-50% of filler, 30-50% of adhesive, 5-20% of blocking agent and 3-10% of lubricant, and fully mixing the materials into a mixed solution with the solid content of 15-30% by high-speed stirring.
Optionally, the filler is one or more of light calcium carbonate, natural kaolin, hollow plastic pigment, and silica.
Optionally, the adhesive is one or more of modified latex and modified polyvinyl alcohol; the modified latex can be one or a mixture of epoxy acrylic latex, styrene-butadiene latex and styrene-acrylic latex; the modified polyvinyl alcohol can be one or a mixture of partial alcoholysis modified polyvinyl alcohol and complete alcoholysis modified polyvinyl alcohol.
Optionally, the blocking agent is a C3 and C4 (perfluorobutyl sulfonate) waterproofing agent which does not contain perfluorooctanoic acid ammonium salt or perfluorooctane sulfonyl compounds, so that the blocking agent can replace a C8 and C6 waterproofing agent which contains perfluorooctanoic acid ammonium salt, thereby effectively improving the waterproof and oil-proof performance and reducing the environmental pollution.
Optionally, the lubricant is one or more of zinc stearate and calcium stearate.
S22: and coating the prepared surface coating liquid on a paper base layer and drying, wherein the filler comprises a hollow plastic pigment, and the mass ratio of the hollow plastic pigment in the dried surface coating liquid is not less than 10%.
Further, the prepared top coat coating liquid is applied on the paper substrate, for example, the prepared top coat coating liquid is applied on the paper substrate by one of the reasonable process methods of film transfer, roll coating, blade coating, air knife coating, curtain coating and the like by a coating machine and dried to obtain the top coat arranged on the paper substrate.
Wherein, the filler in the coating liquid of the top coating further comprises a hollow plastic pigment, and the mass percentage of the hollow plastic pigment in the top coating obtained by drying is not less than 10%.
Optionally, the mass fraction of the adhesive in the topcoat is not less than 15%.
Optionally, the mass fraction of the cross-linking agent in the top coat is not less than 7%.
Optionally, the porosity of the hollow plastic pigment is not less than 50% to enable better printing effect.
In another embodiment, after the surface coating liquid is prepared, the prepared surface coating liquid is further coated on a paper base layer, the coating amount corresponding to the coating of the surface coating liquid is ensured to be 4.5-10.0 g/square meter, and the paper base layer is dried.
S23: and coating the prepared protective layer coating liquid on the dried surface coating liquid and drying to obtain the thermal sensitive paper.
Further, the prepared protective layer coating liquid is coated on the dried top coating liquid, namely the top coating, for example, the prepared protective layer coating liquid is coated on the top coating by using one of the reasonable process modes of film transfer, roll coating, blade coating, air knife coating, curtain coating and the like by using a coating machine, the corresponding coating amount is ensured to be 2.0-5.0 per square meter, and the protective layer arranged on the top coating is obtained by drying, so that the final finished product of the thermal sensitive paper is obtained.
Optionally, the mass ratio of the blocking agent in the protective layer is not less than 5% to ensure that the thermal paper has good protective performance, and meanwhile, the mass ratio of the blocking agent in the protective layer is not more than 20% to avoid the problem of coating separation caused by uneven dispersion of the coating.
It can be understood that, because the thermal-insulation filler is added in the top coating layer of the thermal-sensitive paper to replace the thermal-insulation performance provided by the bottom coating layer in the conventional common thermal-sensitive paper, compared with the conventional common thermal-sensitive paper, the thermal-sensitive paper can omit the preparation of the corresponding bottom coating layer, thereby effectively saving the corresponding energy consumption. However, because the thermal paper lacks a bottom coating with a thermal insulation function, the top coating of the thermal paper has a thermal insulation function to ensure the thermal printing performance of the thermal paper, and if the thermal insulation layer (bottom coating) is simply removed, poor printing, unclear pictures and texts of the thermal paper and even loss of the thermal printing function are caused, so that in order to ensure the printing quality of the thermal paper, the top coating 20 is added with a hollow plastic pigment with high porosity, so that the thermal insulation performance of the thermal paper is improved, and the smoothness of the paper is also ensured.
Furthermore, due to the fact that the using amount of the hollow plastic pigment in the top coating layer is increased, the strength of the top coating layer is weakened, the adhesive and the cross-linking agent are added into the top coating layer of the thermal paper, the thermal paper is coated correspondingly, cross-linking reaction can occur in the drying process, the bonding strength of the top coating layer can be effectively improved, meanwhile, the compactness of the top coating layer is improved, and therefore the thermal paper achieves certain protection performance.
And because the blocking agent added in the protective layer is of a structure containing carbonized fluorine-containing alkyl, the carbonized fluorine-containing alkyl has extremely low surface tension (less than or equal to 30mN/m), so that the liquid can be effectively prevented from permeating, and the protective performance of the thermal paper 1 is further improved.
In one embodiment, first, 90% of 4-hydroxy diphenyl sulfone isopropyl ether and 10% of polyvinyl alcohol are mixed and dispersed to form a dispersion liquid with a solid content of 45%, and the dispersion liquid is ground in a grinding machine to a particle size of 1.0 μm to obtain a developer dispersion liquid; mixing and dispersing 85% of diethylene glycol diphenyl ether and 15% of polyvinyl alcohol into a dispersion liquid with a solid content of 45%, and grinding the dispersion liquid in a grinder until the particle size is 1.4 mu m to obtain a sensitizer dispersion liquid; mixing and dispersing 88% of 2-anilino-3 methyl-6-aminofluorane and 12% of polyvinyl alcohol into a dispersion liquid with a solid content of 50%, and grinding the dispersion liquid in a grinder until the particle size is 0.8 mu m to obtain a leuco dye dispersion liquid; further, 18% of the developer dispersion liquid, 17% of the sensitizer dispersion liquid, 11% of the leuco dye dispersion liquid, 8% of calcined kaolin, 15% of a hollow plastic pigment, 18% of a modified polyvinyl alcohol having a high polymerization degree and being completely alcoholyzed, 8% of an isocyanate, and 5% of zinc stearate were mixed and dispersed to prepare a top coat coating liquid having a solid content of 32%.
Further, 40% of natural kaolin, 40% of completely alcoholysis modified polyvinyl alcohol, 15% of C4 waterproof agent and 5% of zinc stearate are mixed and dispersed to form a protective layer coating liquid with the solid content of 28%.
And then, uniformly coating the prepared coating liquid of the top coating on a paper base layer by using a coating machine, ensuring that the coating quantity of the top coating is 8.0 g/square meter, and drying, uniformly coating the prepared coating liquid of the protection layer on the top coating coated and dried on the paper base layer by using the coating machine, and ensuring that the coating quantity of the protection layer is 4.0 g/square meter, and drying to obtain the final finished product of the thermal sensitive paper.
In another example, 85% of 4-hydroxy-4' -isopropoxydiphenyl sulfone and 15% of polyvinyl alcohol were mixed and dispersed to a dispersion having a solid content of 45%, and ground in a grinder to a particle size of 1.1 μm to obtain a developer dispersion; mixing and dispersing 85% of diphenyl sulfone and 15% of polyvinyl alcohol into a dispersion liquid with a solid content of 45%, and grinding the dispersion liquid in a grinder until the particle size is 1.6 mu m to obtain a sensitizer dispersion liquid; mixing and dispersing 92% of 3-N-isoamyl-N-ethylamino-6-methyl-7-phenylaminofluorane and 8% of polyvinyl alcohol into a dispersion liquid with solid content of 48%, and grinding the dispersion liquid in a grinder until the particle size is 0.9 mu m to obtain a leuco dye dispersion liquid; and mixing and dispersing 18% of the developer dispersion liquid, 16% of the sensitizer dispersion liquid, 10% of the leuco dye dispersion liquid, 8% of calcined kaolin, 16% of hollow plastic pigment, 14% of modified polyvinyl alcohol with high polymerization degree and complete alcoholysis, 3% of acidified starch, 10% of glyoxal and 5% of calcium stearate into a top coating liquid with the solid content of 32%.
Further, 28% of natural kaolin, 15% of light calcium carbonate, 35% of completely alcoholysis modified polyvinyl alcohol, 15% of C4 waterproof agent and 7% of zinc stearate are mixed and dispersed to form a protective layer coating liquid with a solid content of 30%.
And then, uniformly coating the prepared coating liquid of the top coating on a paper base layer by using a coating machine, ensuring that the coating quantity of the top coating is 7.5 g/square meter, and drying, uniformly coating the prepared coating liquid of the protection layer on the top coating coated and dried on the paper base layer by using the coating machine, and ensuring that the coating quantity of the protection layer is 3.6 g/square meter, and drying to obtain the final finished product of the thermal sensitive paper.
In another example, a dispersion having a solid content of 45% was prepared by mixing 4-hydroxydiphenylsulfone isopropyl ether 90% and polyvinyl alcohol 10%, and the mixture was ground in a mill to a particle size of 1.2 μm to obtain a developer dispersion; 88 percent of diphenyl sulfone and 12 percent of polyvinyl alcohol are mixed and dispersed into dispersion liquid with solid content of 45 percent, and the dispersion liquid is ground in a grinder to the particle size of 0.8 mu m to obtain a sensitizer dispersion liquid; mixing and dispersing 88% of 3- (N-ethyl-4-toluidino) -6-methyl-7-anilinofluorane and 12% of polyvinyl alcohol into a dispersion liquid with a solid content of 50%, and grinding the dispersion liquid in a grinder until the particle size is 1.0 mu m to obtain a leuco dye dispersion liquid; and mixing and dispersing 18% of the developer dispersion liquid, 17% of the sensitizer dispersion liquid, 11% of the leuco dye dispersion liquid, 8% of calcined kaolin, 1% of light calcium carbonate, 13% of hollow plastic pigment, 17% of modified polyvinyl alcohol with high polymerization degree and complete alcoholysis, 12% of epichlorohydrin and 3% of zinc stearate into a top coating liquid with the solid content of 32%.
Further, 26% of natural kaolin, 20% of light calcium carbonate, 38% of completely alcoholysis modified polyvinyl alcohol, 10% of C4 waterproof agent and 6% of calcium stearate are mixed and dispersed to form a protective layer coating liquid with a solid content of 30%.
And then, uniformly coating the prepared coating liquid for the top coating on a paper base layer by using a coating machine, and drying after ensuring that the coating quantity of the top coating is 7.2 g/square meter or 7.5 g/square meter, so as to uniformly coat the prepared coating liquid for the protection layer on the top coating coated and dried on the paper base layer by using the coating machine, and drying after ensuring that the coating quantity of the protection layer is 4.2 g/square meter, so as to obtain the final finished product of the thermal sensitive paper.
In another example, 85% of 4-hydroxy-4' -isopropoxydiphenyl sulfone and 15% of polyvinyl alcohol were mixed and dispersed to a dispersion having a solid content of 50%, and ground in a grinder to a particle size of 0.7 μm to obtain a developer dispersion; 88 percent of diphenyl sulfone and 12 percent of polyvinyl alcohol are mixed and dispersed into dispersion liquid with the solid content of 42 percent, and the dispersion liquid is ground in a grinder to the particle size of 1.3 mu m to obtain a sensitizer dispersion liquid; mixing and dispersing 3- (N-ethyl-4-toluidino) -6-methyl-7-anilinofluorane 90% and polyvinyl alcohol 10% into a dispersion liquid with the solid content of 47%, and grinding the dispersion liquid in a grinder until the particle size is 0.9 mu m to obtain a leuco dye dispersion liquid; further, 20% of the developer dispersion, 19% of the sensitizer dispersion, 10% of the leuco dye dispersion, 8% of calcined kaolin, 15% of a hollow plastic pigment, 5% of acidified starch, 10% of epoxy acrylate, 9% of adipic dihydrazide and 4% of zinc stearate were mixed and dispersed to obtain a top-coat coating liquid having a solid content of 30%.
Further, 40% of natural kaolin, 12% of light calcium carbonate, 30% of acrylic latex, 8% of C4 water repellent and 10% of zinc stearate were mixed and dispersed to form a protective layer coating solution having a solid content of 35%.
And then, uniformly coating the prepared coating liquid of the top coating on a paper base layer by using a coating machine, ensuring that the coating quantity of the top coating is 6.8 g/square meter, and drying, uniformly coating the prepared coating liquid of the protection layer on the top coating coated and dried on the paper base layer by using the coating machine, and ensuring that the coating quantity of the protection layer is 3.4 g/square meter, and drying to obtain the final finished product of the thermal sensitive paper.
The beneficial effect of this application is: in contrast to the prior art, the present application provides thermal paper comprising: a paper substrate layer; the top coating is arranged on the paper base layer and comprises filler, an adhesive, a color developing agent, a sensitizer, a leuco dye, a cross-linking agent and a lubricant, wherein the filler comprises a hollow plastic pigment, and the mass ratio of the hollow plastic pigment in the top coating is not less than 10%; the protective layer sets up on the top-coat layer to add cavity plastic pigment in the top-coat layer through at the temperature sensing paper, make the planarization of paper also guaranteed when promoting the heat-proof quality of temperature sensing paper, and can also reduce corresponding production processes, with the energy saving consumption, thereby have good environmental protection characteristic.
The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes performed by the content of the present application and the attached drawings, or directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A thermal paper, characterized in that the thermal paper comprises:
a paper substrate layer;
the top coating is arranged on the paper base layer and comprises filler, an adhesive, a color developing agent, a sensitizer, a leuco dye, a cross-linking agent and a lubricant, wherein the filler comprises a hollow plastic pigment, and the mass ratio of the hollow plastic pigment in the top coating is not less than 10%;
a protective layer disposed on the topcoat.
2. The thermal paper according to claim 1,
the mass ratio of the adhesive in the top coating is not less than 15%.
3. The thermal paper according to claim 2,
the mass ratio of the cross-linking agent in the top coating is not less than 7%.
4. The thermal paper according to claim 1,
the protective layer is made of a blocking agent containing carbonized fluoroalkyl, and the surface tension of the blocking agent is less than or equal to 30 mN/m.
5. The thermal paper according to claim 4,
the blocking agent is a C3 and/or C4 waterproof agent.
6. The thermal paper according to claim 4,
the mass percentage of the blocking agent in the protective layer is not less than 5%.
7. The thermal paper according to claim 1,
the porosity of the hollow plastic pigment is not less than 50%.
8. The preparation method of the thermal paper is characterized by comprising the following steps:
preparing a top coating liquid by adopting a filler, an adhesive, a developer dispersion liquid, a sensitizer dispersion liquid, a leuco dye dispersion liquid, a cross-linking agent and a lubricant in a set ratio, and preparing a protective layer coating liquid;
coating the prepared surface coating liquid on a paper base layer and drying; wherein the filler comprises a hollow plastic pigment, and the mass percentage of the hollow plastic pigment in the dried top coating liquid is not less than 10%;
and coating the prepared protective layer coating liquid on the dried surface coating liquid and drying to obtain the thermal sensitive paper.
9. The method of producing thermal paper according to claim 8,
the top coating liquid comprises an adhesive and a cross-linking agent, wherein the adhesive accounts for not less than 15% of the weight of the top coating liquid, and the cross-linking agent accounts for not less than 7% of the weight of the top coating liquid after being dried.
10. The method of producing thermal paper according to claim 8,
the protective layer coating liquid comprises a blocking agent containing carbonized fluorine-containing alkyl, and the blocking agent is a C3 and/or C4 waterproof agent.
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Application publication date: 20220311 |