CN112301796A - Thermal sensitive paper and preparation method thereof - Google Patents
Thermal sensitive paper and preparation method thereof Download PDFInfo
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- CN112301796A CN112301796A CN201910713419.4A CN201910713419A CN112301796A CN 112301796 A CN112301796 A CN 112301796A CN 201910713419 A CN201910713419 A CN 201910713419A CN 112301796 A CN112301796 A CN 112301796A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
-
- 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
- D21H19/385—Oxides, hydroxides or carbonates
-
- 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
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- 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
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
-
- 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
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
-
- 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
- D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being 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
-
- 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
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Dispersion Chemistry (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Abstract
The application discloses thermal paper and a preparation method thereof, wherein the thermal paper comprises a raw paper layer and a thermal coating, the thermal coating is formed by coating a thermal coating liquid on the raw paper layer, and the thermal coating liquid comprises the following components in parts by mass: 10-40 parts by mass of filler, 15-35 parts by mass of a developer dispersion liquid, 5-25 parts by mass of a sensitizer dispersion liquid, 5-20 parts by mass of a leuco dye dispersion liquid, 5-15 parts by mass of an adhesive and 0.01-0.2 part by mass of a functional additive. The heat-sensitive paper has the color-developing performance and has the functional effects of insect prevention, deinsectization and the like.
Description
Technical Field
The application belongs to the technical field of papermaking, and particularly relates to thermal sensitive paper and a preparation method thereof.
Background
At present, the application of the thermal paper in the market is more and more extensive, and the application of the thermal paper can be seen from common cash registers, traffic tickets, entertainment tickets to logistics labels and food labels with higher requirements, and even valuable securities such as high-end application lottery tickets and the like.
From low-end cash registers and bills without special requirements, to valuable bills with simple protection, to label applications with medium-high protection requirements, and even valuable securities with ultrahigh storage performance, along with the expansion of application layers, the protection performance of the thermosensitive paper is gradually increased.
However, most of the protection performance is only improved, and with the improvement of environmental awareness, the requirement of environmental protection is increasing.
Disclosure of Invention
The technical problem that this application mainly solved is not enough to the mosquito prevention and cure to provide a thermal sensitive paper with mosquito-proof protection against insects performance.
In order to solve the technical problem, the application adopts a technical scheme that: the thermal paper is characterized by comprising a raw paper layer and a thermal coating, wherein the thermal coating is formed by coating a thermal coating liquid on the raw paper layer, and the thermal coating liquid comprises the following components in parts by mass: 10-40 parts by mass of filler, 15-35 parts by mass of a developer dispersion liquid, 5-25 parts by mass of a sensitizer dispersion liquid, 5-20 parts by mass of a leuco dye dispersion liquid, 5-15 parts by mass of an adhesive and 0.01-0.2 part by mass of a functional additive.
Further, the content of the functional additive may be 0.01 to 0.14 parts by mass.
Wherein the functional additive comprises pyrethrin, and the pyrethrin is natural pyrethrin or pyrethroid.
Preferably, the pyrethrin includes one or more of fenpropathrin, cypermethrin, beta-cypermethrin, cyfluthrin and allethrin.
Specifically, the thermal paper further includes a base coating layer, wherein the base coating layer is disposed on the raw paper layer, wherein the thermal paper includes, in order, the raw paper layer, the base coating layer disposed on the raw paper layer, and the thermal coating layer disposed on the base coating layer.
Specifically, the developer dispersion liquid is a mixed liquid of 80-95 parts by mass of a developer and 5-20 parts by mass of a dispersant; the sensitizer dispersion liquid is a mixed liquid of 80-95 parts by mass of a sensitizer and 5-20 parts by mass of a dispersant; the leuco dye dispersion is a mixed solution of 80-95 parts by mass of a leuco dye and 5-20 parts by mass of a dispersant.
Preferably, the dispersant is polyvinyl alcohol; the particle size of the developer dispersion liquid is 0.4-1.2 microns, and the solid content is 40-50%; the particle size of the sensitizer dispersion liquid is 0.8-2.0 microns, and the solid content is 40-50%; the particle size of the leuco dye dispersion is 0.6-1.5 microns, and the solid content is 40-50%.
More preferably, the color developing agent is any one of 2, 2-bi-p-phenol propane, dihydroxy diphenol, 4-hydroxy-4' -isopropoxy diphenylsulfone and 2, 4-diphenylsulfuryl phenol; the sensitizer is any one or a mixture of more of diphenol, diethylene glycol diphenyl ether and dimethyl phenoxy ethane; the leuco dye is any one or a mixture of 2-anilino-3-methyl-6-aminofluoran and crystal violet lactone.
Specifically, the filler is one or a mixture of light calcium carbonate, heavy calcium carbonate and kaolin; the adhesive is any one or a mixture of more of latex, polyvinyl alcohol and starch.
Further, the starch comprises one or more of acidified starch, esterified starch and native starch.
Preferably, the latex comprises one or a mixture of acrylic latex, styrene-butadiene latex and propyl benzene latex;
preferably, the polyvinyl alcohol comprises one or a mixture of partial alcohol depolymerization vinyl alcohol and complete alcohol depolymerization vinyl alcohol with the polymerization degree of 1000-2000.
In order to solve the above technical problem, another technical solution adopted by the present application is: provided is a method for preparing thermal paper, comprising the following steps:
stirring and mixing 10-40 parts by mass of a filler, 15-35 parts by mass of a developer dispersion liquid, 5-25 parts by mass of a sensitizer dispersion liquid, 5-20 parts by mass of a leuco dye dispersion liquid, 5-15 parts by mass of an adhesive and 0.01-0.2 part by mass of a functional additive to form a thermosensitive coating liquid with a solid content of 15-40%; and coating the thermosensitive coating liquid on the raw paper layer to form the thermosensitive coating.
Specifically, the functional additive is pyrethrin, and the pyrethrin is natural pyrethrin or pyrethroid.
The beneficial effect of this application is: different from the situation of the prior art, the thermal paper of this application embodiment, through raw materials and the ratio that changes the thermal coating liquid for each raw materials is collaborative mutually, can reach the chromophoric effect, has functional effects such as mosquito-proof, protection against insects, deinsectization effect simultaneously, and the thermal coating liquid dispersion is even, and coats evenly on the body paper, forms even thermal coating, and the pyrethrin that adds in the thermal paper of this application embodiment is easy to decompose in the environment, friendly to the environment, low toxicity, odorless, pollution-free to the mammal, and high-speed effective deinsectization.
Drawings
FIG. 1 is a schematic flow diagram of one embodiment of a method for making thermal paper according to the present application;
FIG. 2 is a schematic flow diagram of another embodiment of a method of making thermal paper according to the present application;
FIG. 3 is a schematic diagram of a construction of an embodiment of thermal paper according to the present application;
fig. 4 is a schematic structural view of another embodiment of thermal paper according to the present application.
Detailed Description
In order to make the purpose, technical solution and effect of the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, a schematic flow chart of an embodiment of a method for manufacturing thermal paper of the present application is shown, and the method for manufacturing thermal paper includes:
step S110: stirring and mixing 10-40 parts by mass of a filler, 15-35 parts by mass of a developer dispersion liquid, 5-25 parts by mass of a sensitizer dispersion liquid, 5-20 parts by mass of a leuco dye dispersion liquid, 5-15 parts by mass of an adhesive and 0.01-0.2 part by mass of a functional additive to form a thermosensitive coating liquid with a solid content of 15-40%;
step S200: and coating the thermosensitive coating liquid on the raw paper layer to form the thermosensitive coating.
Preferably, the functional additive is pyrethrin, and the pyrethrin is natural pyrethrin or pyrethroid.
Referring to fig. 2, before performing step S110, preparing a developer dispersion liquid, a sensitizer dispersion liquid, and a colorless fuel dispersion liquid is further included.
Referring to the structure diagram of an embodiment of the thermal paper 100 of the present application, the thermal paper includes a raw paper layer 3 and a thermal coating layer 1, and the thermal coating layer 1 is formed by coating a thermal coating layer coating liquid on the raw paper layer 3, wherein the thermal coating layer coating liquid includes, in parts by mass: 10-40 parts by mass of filler, 15-35 parts by mass of a developer dispersion liquid, 5-25 parts by mass of a sensitizer dispersion liquid, 5-20 parts by mass of a leuco dye dispersion liquid, 5-15 parts by mass of an adhesive and 0.01-0.2 part by mass of a functional additive.
Further, the content of the functional additive may be 0.01 to 0.14 parts by mass.
Wherein the functional additive comprises pyrethrin, and the pyrethrin is natural pyrethrin or pyrethroid.
Preferably, the pyrethrin includes one or more of fenpropathrin, cypermethrin, beta-cypermethrin, cyfluthrin and allethrin.
Specifically, as shown in fig. 4, the thermal paper further includes a base coating layer 2, wherein the base coating layer 2 is disposed on the raw paper layer 3, and wherein the thermal paper sequentially includes the raw paper layer 3, the base coating layer 2 disposed on the raw paper layer 3, and the thermal coating layer 1 disposed on the base coating layer 2.
Specifically, the developer dispersion liquid is a mixed liquid of 80-95 parts by mass of a developer and 5-20 parts by mass of a dispersant; the sensitizer dispersion liquid is a mixed liquid of 80-95 parts by mass of a sensitizer and 5-20 parts by mass of a dispersant; the leuco dye dispersion is a mixed solution of 80-95 parts by mass of a leuco dye and 5-20 parts by mass of a dispersant.
Preferably, the dispersant is polyvinyl alcohol; the particle size of the developer dispersion liquid is 0.4-1.2 microns, and the solid content is 40-50%; the particle size of the sensitizer dispersion liquid is 0.8-2.0 microns, and the solid content is 40-50%; the particle size of the leuco dye dispersion is 0.6-1.5 microns, and the solid content is 40-50%.
More preferably, the color developing agent is any one of 2, 2-bi-p-phenol propane, dihydroxy diphenol, 4-hydroxy-4' -isopropoxy diphenylsulfone and 2, 4-diphenylsulfuryl phenol; the sensitizer is any one or a mixture of more of diphenol, diethylene glycol diphenyl ether and dimethyl phenoxy ethane; the leuco dye is any one or a mixture of 2-anilino-3-methyl-6-aminofluoran and crystal violet lactone.
Specifically, the filler is one or a mixture of light calcium carbonate, heavy calcium carbonate and kaolin; the adhesive is any one or a mixture of more of latex, polyvinyl alcohol and starch.
Further, the starch comprises one or more of acidified starch, esterified starch and native starch.
Preferably, the latex comprises one or a mixture of acrylic latex, styrene-butadiene latex and propyl benzene latex;
preferably, the polyvinyl alcohol comprises one or a mixture of partial alcohol depolymerization vinyl alcohol and complete alcohol depolymerization vinyl alcohol with the polymerization degree of 1000-2000.
The thermal paper of the present application will be further described below with reference to specific examples.
Example 1
The preparation method of the thermal paper comprises the following steps:
first, preparing a dispersion
1) Preparing a developer dispersion liquid: 90 parts by mass of dihydroxybiphenol and 10 parts by mass of polyvinyl alcohol were mixed in parts by mass, dispersed to a dispersion liquid having a solid content of 45%, and ground in a grinder to a particle size of 0.8 μm to obtain a developer dispersion liquid.
2) Preparing a sensitizer dispersion liquid: 88 parts by mass of diethylene glycol diphenyl ether and 12 parts by mass of polyvinyl alcohol were mixed in parts by mass, dispersed to a dispersion liquid having a solid content of 45%, and ground in a grinder to a particle size of 1.5 μm to obtain a sensitizer dispersion liquid.
3) Preparation of a leuco dye dispersion: 89 parts by mass of 2-anilino-3-methyl-6-aminofluoran and 11 parts by mass of polyvinyl alcohol were mixed in parts by mass, dispersed to a dispersion having a solid content of 50%, and ground in a grinder to a particle size of 1.0 μm to obtain a leuco dye dispersion.
Secondly, preparing heat-sensitive coating liquid
24 parts by mass of the developer dispersion liquid, 22 parts by mass of the sensitizer dispersion liquid, 12 parts by mass of the leuco dye dispersion liquid, 29.45 parts by mass of kaolin, 12.5 parts by mass of acrylic latex, and 0.05 part by mass of cypermethrin were mixed in parts by mass to disperse the mixture into a heat-sensitive coating liquid having a solid content of 35%.
Third, paper coating
Uniformly coating the thermosensitive coating liquid prepared in the second step on the base paper by using a coating machine, wherein in the embodiment, a bottom coating is coated on the base paper, and the bottom coating comprises 80 parts by mass of calcined kaolin and 20 parts by mass of styrene-butadiene latex; specifically, in this example, the thermosensitive coating liquid was coated over the undercoat layer at a coating amount of 6.5 g/square meter to prepare thermosensitive paper comprising, in order as shown in fig. 4, a raw paper layer 3, an undercoat layer 2 on the raw paper layer 3, and a thermosensitive coating layer 1 on the undercoat layer 2.
In the heat-sensitive paper of the embodiment, the heat-sensitive layer contains the functional additive pyrethrin, and the heat-sensitive layer of the heat-sensitive paper can exert contact killing activity by contacting the wall of an insect body; or after the insects eat the heat-sensitive layer of the heat-sensitive paper, the pyrethrin exerts stomach toxicity activity to achieve the effect of preventing insects and killing insects. In addition, the pyrethrin added into the thermal paper in the embodiment of the application is easy to decompose in the environment, has low toxicity to mammals, is odorless and pollution-free, effectively deinsectizes at a high speed, and is environment-friendly.
Example 2
The preparation method of the thermal paper comprises the following steps:
first, preparing a dispersion
1) Preparing a developer dispersion liquid: according to the mass ratio, 90 parts by mass of 4-hydroxy-4' isopropoxydiphenyl sulfone and 10 parts by mass of polyvinyl alcohol are mixed and dispersed into a dispersion liquid with a solid content of 40%, and the dispersion liquid is ground in a grinder until the particle size is 0.8 micron, so that a developer dispersion liquid is obtained.
2) Preparing a sensitizer dispersion liquid: 86 parts by mass of diethylene glycol diphenyl ether and 14 parts by mass of polyvinyl alcohol were mixed in parts by mass, dispersed to a dispersion liquid having a solid content of 45%, and ground in a grinder to a particle size of 1.2 μm to obtain a sensitizer dispersion liquid.
3) Preparation of a leuco dye dispersion: according to the mass part ratio, 86 parts by mass of 2-anilino-3-methyl-6-aminofluoran and 14 parts by mass of polyvinyl alcohol are mixed and dispersed into a dispersion liquid with a solid content of 45%, and the dispersion liquid is ground in a grinding machine until the particle size is 1.2 micrometers, so that a leuco dye dispersion liquid is obtained.
Secondly, preparing heat-sensitive coating liquid
Mixing 25 parts by mass of the developer dispersion liquid, 20 parts by mass of the sensitizer dispersion liquid, 10 parts by mass of the leuco dye dispersion liquid, 32.5 parts by mass of kaolin, 12.42 parts by mass of polyvinyl alcohol and 0.08 part by mass of fenpropathrin, and dispersing the mixture into a thermosensitive coating liquid with a solid content of 30%, wherein the polyvinyl alcohol is polyvinyl alcohol with complete alcoholysis and a polymerization degree of 1500.
Third, paper coating
And (3) uniformly coating the thermosensitive coating liquid prepared in the second step on the base paper coated with the base coat by using a coating machine, wherein the coating quantity of the thermosensitive coating layer is 5.2 g/square meter, the base coat in the embodiment comprises 80 parts by mass of calcined kaolin and 20 parts by mass of styrene butadiene latex, and the thermosensitive coating liquid is uniformly coated on the base coat to prepare thermosensitive paper, and the thermosensitive paper sequentially comprises a base paper layer 3, a base coat 2 positioned on the base paper layer 3 and a thermosensitive coating 1 positioned on the base coat 2 as shown in figure 4.
Example 3
The preparation method of the thermal paper comprises the following steps:
first, preparing a dispersion
1) Preparing a developer dispersion liquid: mixing 92 parts by mass of 2, 4-diphenylsulfuryl phenol and 8 parts by mass of polyvinyl alcohol according to the mass part ratio, dispersing into dispersion liquid with the solid content of 40%, and grinding in a grinding machine until the particle size is 0.8 micrometer to obtain the developer dispersion liquid.
2) Preparing a sensitizer dispersion liquid: 38 parts by mass of dimethylphenoxyethane, 52 parts by mass of diethylene glycol diphenyl ether and 10 parts by mass of polyvinyl alcohol were mixed in parts by mass, dispersed to a dispersion having a solid content of 45%, and ground in a grinder to a particle diameter of 1.2 μm to obtain a sensitizer dispersion.
3) Preparation of a leuco dye dispersion: 92 parts by mass of crystal violet lactone and 8 parts by mass of polyvinyl alcohol are mixed according to the mass part ratio, dispersed into a dispersion liquid with solid content of 45%, and ground in a grinding machine until the particle size is 1.5 microns, and the leuco dye dispersion liquid is obtained.
Secondly, preparing heat-sensitive coating liquid
26 parts by mass of the developer dispersion liquid, 21 parts by mass of the sensitizer dispersion liquid, 8% by mass of the leuco dye dispersion liquid, 20% by mass of light calcium carbonate, 14 parts by mass of heavy calcium carbonate, 10.97 parts by mass of polyvinyl alcohol, and 0.03 part by mass of cypermethrin are mixed and dispersed to form a thermosensitive coating liquid with a solid content of 30%, wherein the polyvinyl alcohol is polyvinyl alcohol with complete alcoholysis and a polymerization degree of 2000.
Third, paper coating
And (3) uniformly coating the thermosensitive coating liquid prepared in the step two on the base paper coated with the base coat by using a coating machine, wherein the coating quantity of the thermosensitive coating layer is 4.0 g/square meter. In the present example, the primer layer contained 85% of precipitated calcium carbonate and 15 parts by mass of polyvinyl alcohol, and the thermosensitive coating liquid was uniformly applied on the primer layer to prepare thermosensitive paper comprising, in this order, a raw paper layer 3, a primer layer 2 on the raw paper layer 3, and a thermosensitive coating layer 1 on the primer layer 2 as shown in fig. 4.
Example 4
The preparation method of the thermal paper comprises the following steps:
first, preparing a dispersion
1) Preparing a developer dispersion liquid: 88 parts by mass of 4-hydroxy-4' isopropoxydiphenyl sulfone and 12 parts by mass of polyvinyl alcohol were mixed and dispersed to a dispersion having a solid content of 50%, and the mixture was ground in a grinder to a particle size of 0.8 μm to obtain a developer dispersion.
2) Preparing a sensitizer dispersion liquid: according to the mass part ratio, 90 parts by mass of diethylene glycol diphenyl ether and 10 parts by mass of polyvinyl alcohol are mixed and dispersed into a dispersion liquid with a solid content of 45%, and the dispersion liquid is ground in a grinding machine until the particle size is 1.5 microns, so that a sensitizer dispersion liquid is obtained.
3) Preparation of a leuco dye dispersion: according to the mass ratio, 90 parts by mass of 2-anilino-3-methyl-6-aminofluoran and 10 parts by mass of polyvinyl alcohol are mixed and dispersed into a dispersion liquid with a solid content of 45%, and the dispersion liquid is ground in a grinder until the particle size is 0.6 micron, so that a leuco dye dispersion liquid is obtained.
Secondly, preparing heat-sensitive coating liquid
According to the mass ratio, 25 parts by mass of the developer dispersion liquid, 20 parts by mass of the sensitizer dispersion liquid, 10 parts by mass of the leuco dye dispersion liquid, 33.9 parts by mass of kaolin, 5.5 parts by mass of acrylic latex, 5.5 parts by mass of styrene-butadiene latex and 0.1 part by mass of high-efficiency cypermethrin are mixed and dispersed into the thermosensitive coating liquid with the solid content of 30%.
Third, paper coating
And (3) uniformly coating the thermosensitive coating liquid prepared in the second step on the base paper coated with the base coat by using a coating machine, wherein the coating quantity of the thermosensitive coating layer is 6.2 g/square meter, the base coat in the embodiment comprises 40 parts by mass of heavy calcium carbonate, 42 parts by mass of light calcium carbonate and 18 parts by mass of acrylic latex, and the thermosensitive coating liquid is uniformly coated on the base coat to prepare the thermosensitive paper, and the thermosensitive paper sequentially comprises a base paper layer 3, a base coat 2 positioned on the base paper layer 3 and a thermosensitive coating 1 positioned on the base coat 2 as shown in figure 4.
Example 5
First, preparing a dispersion
1) Preparing a developer dispersion liquid: according to the mass ratio, 88 parts by mass of 4-hydroxy-4' isopropoxydiphenyl sulfone and 12 parts by mass of polyvinyl alcohol are mixed and dispersed to form a dispersion liquid with the solid content of 50%, and the dispersion liquid is ground in a grinding machine until the particle size is 1.1 micron, so that a developer dispersion liquid is obtained.
2) Preparing a sensitizer dispersion liquid: according to the mass part ratio, 87 parts by mass of diethylene glycol diphenyl ether and 13 parts by mass of polyvinyl alcohol are mixed and dispersed into a dispersion liquid with the solid content of 45%, and the dispersion liquid is ground in a grinding machine until the particle size is 1.8 microns, so that a sensitizer dispersion liquid is obtained.
3) Preparation of a leuco dye dispersion: according to the mass ratio, 90 parts by mass of 2-anilino-3-methyl-6-aminofluoran and 10 parts by mass of polyvinyl alcohol are mixed and dispersed into a dispersion liquid with a solid content of 45%, and the dispersion liquid is ground in a grinding machine until the particle size is 0.8 micron, so that the leuco dye dispersion liquid is obtained.
Secondly, preparing heat-sensitive coating liquid
According to the mass ratio, 23 parts of the developer dispersion liquid, 18 parts of the sensitizer dispersion liquid, 10 parts of the leuco dye dispersion liquid, 25 parts of light calcium carbonate, 10.85 parts of kaolin, 6 parts of acrylic latex, 7 parts of polyvinyl alcohol and 0.15 part of allethrin% are mixed and dispersed into the thermosensitive coating liquid with the solid content of 30%, wherein the polyvinyl alcohol is completely alcoholyzed and the polymerization degree of the polyvinyl alcohol is 1200.
Third, paper coating
And (4) uniformly coating the thermosensitive coating liquid prepared in the step two on the base paper by using a coating machine, wherein the coating quantity of the thermosensitive coating layer is 5.2 g/square meter, and preparing to obtain the thermosensitive paper. The thermal paper comprises a raw paper layer 3 and a thermal coating layer 1 on the raw paper layer 3 in sequence as shown in fig. 3.
Example 6
The preparation method of the thermal paper of the embodiment comprises the following steps:
first, preparing a dispersion
1) Preparing a developer dispersion liquid: according to the mass part ratio, 90 parts by mass of 2, 2-di-p-phenol propane and 10 parts by mass of polyvinyl alcohol are mixed and dispersed into a dispersion liquid with a solid content of 45%, and the dispersion liquid is ground in a grinding machine until the particle size is 0.8 micron, so that a color developing agent dispersion liquid is obtained.
2) Preparing a sensitizer dispersion liquid: 88 parts by mass of diphenol and 12 parts by mass of polyvinyl alcohol were mixed in parts by mass, and dispersed to a dispersion having a solid content of 45%, and the resulting dispersion was ground in a grinder to a particle size of 1.5 μm to obtain a sensitizer dispersion.
3) Preparation of a leuco dye dispersion: according to the mass part ratio, 48 parts by mass of 2-anilino-3-methyl-6-aminofluoran, 41 parts by mass of crystal violet lactone and 11 parts by mass of polyvinyl alcohol are mixed and dispersed into a dispersion liquid with a solid content of 50%, and the dispersion liquid is ground in a grinding machine until the particle size is 1.0 micron, so that the leuco dye dispersion liquid is obtained.
Secondly, preparing heat-sensitive coating liquid
15 parts by mass of the developer dispersion liquid, 25 parts by mass of the sensitizer dispersion liquid, 20 parts by mass of the leuco dye dispersion liquid, 24.8 parts by mass of kaolin, 15 parts by mass of acrylic latex, and 0.2 part by mass of cypermethrin were mixed in parts by mass to disperse the mixture into a thermosensitive coating liquid having a solid content of 35%.
Third, paper coating
Uniformly coating the thermosensitive coating liquid prepared in the second step on the base paper by using a coating machine, wherein in the embodiment, a bottom coating is coated on the base paper, and the bottom coating comprises 80 parts by mass of calcined kaolin and 20 parts by mass of styrene-butadiene latex; specifically, in this example, the thermosensitive coating liquid was coated over the undercoat layer at a coating amount of 6.5 g/square meter to prepare thermosensitive paper comprising, in order as shown in fig. 4, a raw paper layer 3, an undercoat layer 2 on the raw paper layer 3, and a thermosensitive coating layer 1 on the undercoat layer 2.
Example 7
The method for preparing the thermal paper of the embodiment is the same as the embodiment 5 in the first and third steps, and is different from the second step, wherein the second step is as follows:
preparation of coating liquid for thermosensitive coating
The developer dispersion liquid 35 parts by mass, the sensitizer dispersion liquid 5 parts by mass, the leuco dye dispersion liquid 20 parts by mass, kaolin 34.99 parts by mass, acrylic latex 5 parts by mass, and cypermethrin 0.01 parts by mass were mixed in parts by mass, and dispersed to form a heat-sensitive coating liquid having a solid content of 35%.
Comparative example 1
The method for preparing the thermal paper of this example is the same as that of example 6, and will not be described in detail.
The method for preparing the thermal paper of the embodiment further comprises the following steps:
secondly, preparing heat-sensitive coating liquid
15 parts by mass of the developer dispersion liquid, 25 parts by mass of the sensitizer dispersion liquid, 20 parts by mass of the leuco dye dispersion liquid, 24.5 parts by mass of kaolin, 15 parts by mass of acrylic latex and 0.5 part by mass of cypermethrin were mixed in parts by mass to disperse the mixture into a thermosensitive coating liquid having a solid content of 35%.
Third, paper coating
Coating the heat-sensitive coating liquid prepared in the second step on the base paper by using a coater, wherein in the embodiment, a base coating is coated on the base paper, and the base coating comprises 80 parts by mass of calcined kaolin and 20 parts by mass of styrene-butadiene latex; specifically, in this example, the thermosensitive coating liquid was coated over the primer layer at a coating amount of 6.5 g/square meter to prepare thermosensitive paper, which sequentially included a raw paper layer, a primer layer on the raw paper layer, and a thermosensitive coating layer on the primer layer. In this example, there was an abnormality in the coating operation of the thermal paper when the thermal coating liquid was applied, and "fish eyes" and "craters" appeared during the coating. Because the functional additive is an ester chemical, the heat-sensitive coating liquid is easily layered and dispersed unevenly when the functional additive is used excessively, and the quality problem of the formed heat-sensitive paper is caused.
By combining examples 1 to 7 and comparative example 1, it can be seen that, in the examples of the present application, 0.01 to 0.2 mass part of functional additive pyrethrin is added to the thermosensitive coating layer of the thermosensitive paper, so that the thermosensitive layer at the outer layer can achieve the pyrethrum effect when the thermosensitive paper is stored in a wound or unfolded state, and when the content of the pyrethrin exceeds 0.2 mass part, the coating operation of the thermosensitive paper is easy to be abnormal, the coating liquid of the thermosensitive coating is easy to be layered and dispersed unevenly, and the formed thermosensitive paper has the quality problems of fish eyes and shrinkage cavities when being coated. In the thermal paper of the embodiment, the components of the coating liquid of the thermal coating cooperate with each other, the color development of the thermal paper is not influenced, and the thermal printing head can still contact and heat the thermal coating of the thermal paper to ensure that the thermal material in the thermal coating reacts to develop the color; the color development effect of the thermosensitive coating liquid is normal, the formed thermosensitive paper thermosensitive layer is uniformly coated, and the deinsectization effect can be achieved.
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.
Claims (10)
1. The thermal paper is characterized by comprising a raw paper layer and a thermal coating layer, wherein the thermal coating layer is formed by coating thermal coating layer coating liquid on the raw paper layer, and the thermal coating layer coating liquid comprises the following components in parts by mass: 10-40 parts by mass of filler, 15-35 parts by mass of a developer dispersion liquid, 5-25 parts by mass of a sensitizer dispersion liquid, 5-20 parts by mass of a leuco dye dispersion liquid, 5-15 parts by mass of an adhesive and 0.01-0.2 part by mass of a functional additive.
2. The thermal paper as claimed in claim 1, wherein the functional additive comprises pyrethrin, which is a natural pyrethrin or pyrethroid.
3. The thermal paper as claimed in claim 2, wherein the pyrethrin comprises one or more of fenpropathrin, cypermethrin, beta-cypermethrin, cyfluthrin, and allethrin.
4. The thermal paper according to claim 1, further comprising a base coating layer, wherein the thermal paper comprises a raw paper layer, a base coating layer on the raw paper layer, and a thermal coating layer on the base coating layer in this order.
5. The thermal paper according to claim 1, wherein the developer dispersion liquid is a mixture of 80 to 95 parts by mass of a developer and 5 to 20 parts by mass of a dispersant; the sensitizer dispersion liquid is a mixed liquid of 80-95 parts by mass of a sensitizer and 5-20 parts by mass of a dispersant; the leuco dye dispersion is a mixed solution of 80-95 parts by mass of a leuco dye and 5-20 parts by mass of a dispersant.
6. The thermal paper according to claim 5, wherein said dispersant is polyvinyl alcohol; the particle size of the developer dispersion liquid is 0.4-1.2 microns, and the solid content is 40-50%; the particle size of the sensitizer dispersion liquid is 0.8-2.0 microns, and the solid content is 40-50%; the particle size of the leuco dye dispersion is 0.6-1.5 microns, and the solid content is 40-50%.
7. The thermal paper according to claim 5, wherein the color developer is any one of 2, 2-bis-p-phenolpropane, dihydroxy-diphenol, 4-hydroxy-4' -isopropoxy-diphenylsulfone, 2, 4-diphenylsulfonylphenol group; the sensitizer is any one or a mixture of more of diphenol, diethylene glycol diphenyl ether and dimethyl phenoxy ethane; the leuco dye is any one or a mixture of 2-anilino-3-methyl-6-aminofluoran and crystal violet lactone.
8. The thermal paper as claimed in claim 1, wherein the filler is one or more of light calcium carbonate, heavy calcium carbonate and kaolin; the adhesive is any one or a mixture of more of latex, polyvinyl alcohol and starch.
9. A method for preparing thermal paper is characterized by comprising the following steps:
stirring and mixing 10-40 parts by mass of a filler, 15-35 parts by mass of a developer dispersion liquid, 5-25 parts by mass of a sensitizer dispersion liquid, 5-20 parts by mass of a leuco dye dispersion liquid, 5-15 parts by mass of an adhesive and 0.01-0.2 part by mass of a functional additive to form a thermosensitive coating liquid with a solid content of 15-40%;
and coating the thermosensitive coating liquid on the raw paper layer to form the thermosensitive coating.
10. The method of preparing thermal paper according to claim 9, wherein the functional additive is pyrethrin, and the pyrethrin is natural pyrethrin or pyrethroid.
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| CN113931009A (en) * | 2021-10-18 | 2022-01-14 | 安徽睿智弘科技有限公司 | Environment-friendly thermal sensitive paper with clear color development and preparation method thereof |
| CN115852742A (en) * | 2022-10-20 | 2023-03-28 | 康爱特维迅（蓬莱）化学有限公司 | Thermosensitive color developing coating with stable color development and preparation method thereof |
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