CN113863051B - Thermal insulation coating material for thermal sensitive paper and preparation method thereof - Google Patents
Thermal insulation coating material for thermal sensitive paper and preparation method thereof Download PDFInfo
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- CN113863051B CN113863051B CN202111188886.3A CN202111188886A CN113863051B CN 113863051 B CN113863051 B CN 113863051B CN 202111188886 A CN202111188886 A CN 202111188886A CN 113863051 B CN113863051 B CN 113863051B
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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
- 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
- D21H21/50—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 form
- D21H21/52—Additives of definite length or shape
- D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
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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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/423—Intermediate, backcoat, or covering layers characterised by non-macromolecular compounds, e.g. waxes
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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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
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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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
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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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
- B41M5/443—Silicon-containing polymers, e.g. silicones, siloxanes
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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
- 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
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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
- 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
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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
- 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
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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
- 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
- D21H19/46—Non-macromolecular organic compounds
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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
- 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
- D21H19/52—Cellulose; Derivatives thereof
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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
- 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
- D21H19/54—Starch
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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
- 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
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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
- 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
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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
- 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
- D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
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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
- 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
- D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a thermal insulation coating material for thermal sensitive paper and a preparation method thereof, and the raw materials for preparing the thermal insulation coating material for thermal sensitive paper comprise the following components in parts by weight: 30-60 parts of heat insulation microspheres, 20-40 parts of adhesive, 1-3 parts of water-retaining agent, 1-4 parts of wetting agent, 0.5-1 part of dispersing agent, 0.1-0.5 part of defoaming agent and 5-30 parts of filler, wherein the heat insulation microspheres are foamed microspheres. The heat-insulating coating material utilizes the foamed microspheres to replace common hollow spheres as a blocking aid, can improve the color development optical density and color development sensitivity of the heat-sensitive coating under the condition of the same coating weight, reduces the coating weight of the coating under the condition of reaching the same color development optical density data, and saves the using amount of main materials such as color development agents.
Description
Technical Field
The invention relates to a heat-sensitive heat-insulating coating material, in particular to a heat-sensitive heat-insulating coating material for heat-sensitive paper and a preparation method thereof.
Background
With the development of the thermal paper technology, the quality is becoming mature day by day and the characteristics of simple and convenient use, the application field is becoming more and more extensive, the original common receipt or the recorded characters and patterns are used without stamping confirmation, and after the receipt is used as an electronic invoice or receipt certificate, a bar code needs to be prefabricated on the surface of the receipt for identification or stamping confirmation.
The thermal sensitive paper comprises a raw paper layer, a pre-coating layer and a coloring layer, wherein the pre-coating layer and the coloring layer are sequentially formed on the raw paper layer; the precoating layer is used for improving the smoothness and the heat insulation property of the base paper; the coloring layer is a main coloring unit and comprises dye, adhesive and filler. The dye is used as a main color development body and mainly comprises at least one of crystal violet lactone, 2, 4-diphenylsulfone phenol, 4-hydroxy-4-isopropoxy diphenylsulfone (D-8), 4-dihydroxy diphenylsulfone (bisphenol S), 2-phenylamino-3-methyl-6-dibutylfluorane (ODB-2) and 4-dibutyl ketonic acid (BBA).
The precoating layer is mainly made of porous materials and is precoated on the surface of the base paper layer, so that the precoating layer has high covering performance, and one is to ensure that the effective components of the thermosensitive coating stay at the upper part of the precoating layer and cannot enter the paper base layer; the most important effect is that the energy in the thermosensitive recording process is concentrated on the thermosensitive layer and not transferred to the paper base, so that the heat conduction isolation effect is realized, the color development sensitivity and the color development optical density (definition) of the thermosensitive printing head are improved, a small amount of thermosensitive paint can be used for obtaining a higher color development effect, the using amount of the thermosensitive paint is saved, and the color development sensitivity and definition are improved. The material with a porous structure mainly comprises glass beads, hollow spheres, nano silicon dioxide, bentonite, nano calcium carbonate, porcelain clay and calcium phosphate. The hollow ball (for example, the hollow ball prepared by using silicon dioxide or acrylic acid or polystyrene as raw materials) has the best use effect, has uniform and controllable particle size, 60-70% of porosity due to the hollow structure, obvious heat blocking effect and obvious use effect when being used in medium and low-end thermal sensitive paper; however, on high-end products, a material with thermal insulation property is needed to improve the insulation property, the unique advantages of the expandable microspheres with small particle size are reflected, the particle size after foaming can be controlled to be D50 less than 5 micrometers, and the hollow rate can reach about 97% at most. The heat insulation performance is improved due to the fact that the hollow rate is improved to be about 50% at most, the thickness of the coating can be reduced, ideal heat insulation performance can be achieved only by covering the surface with one layer of microspheres, and meanwhile the color development sensitivity and the color development optical density (definition) are improved in a breakthrough mode.
Disclosure of Invention
In view of the above-mentioned drawbacks of the materials with hollow structure of the prior thermal paper precoat, an object of the present invention is to provide a novel thermal insulation coating material for thermal paper, which further improves the thermal insulation performance of the thermal paper precoat, improves the sensitivity of color development and color development optical density, and reduces the wear of the thermal printing head.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
the thermal insulation coating material for the thermal paper comprises the following raw materials in parts by weight:
the heat insulation microspheres are foamed microspheres.
Preferably, the particle size of the expanded microspheres is D50 less than 5 microns, and the maximum particle size is less than 35 microns.
Further preferably, the expanded microspheres have a D10 of less than 35 microns.
Preferably, the mass content of the foamed microsphere particles is 40-70% of the total solid mass.
Preferably, the expanded microspheres have an expansion ratio of 1 to 10.
Preferably, the volume hollow ratio of the expanded microspheres is 60 to 97%.
Preferably, the mass of the foamed microsphere particles accounts for 40-70% of the total solid mass.
Preferably, the adhesive is one or a mixture of more of acrylic emulsion, polyurethane emulsion, styrene-butadiene latex, styrene-acrylic latex, PCV and modified starch.
Preferably, the water retaining agent is selected from one or a mixture of more of polyacrylamide PAM, cellulose, ethylene glycol and propylene glycol.
Preferably, the wetting agent is selected from one or a mixture of several of alkyl polyoxyethylene ether, condensation product of fatty alcohol and ethylene oxide, alkyl naphthalene sulfonate, organosilicon wetting synergist and sodium isopropyl naphthalene sulfonate.
Preferably, the dispersant is one or a mixture of more of polyurethane modified silane, fatty acid bis, fatty alcohol polyoxyethylene ether, and condensation product of fatty alcohol and ethylene oxide.
Preferably, the defoaming agent is selected from one or a mixture of more of polyether modified silicon, polyether, non-silicone polymer, modified polymethylsiloxane and organic silicon.
Preferably, the filler is one or a mixture of more of calcium carbonate, kaolin, bentonite and talcum powder.
The invention also provides a preparation method of the thermal insulation coating material for the thermal sensitive paper, which comprises the following steps:
(1) Adding water into the heat insulation microspheres to prepare a solution with 10% solid content, and stirring at 1000-2000r/min to fully mix the solution for 20-30min;
(2) Sequentially adding a defoaming agent and a dispersing agent into the mixed solution in the step (1), and fully mixing for 20-30min through stirring at 1000-5000 r/min;
(3) Adding an adhesive, a water-retaining agent and a wetting agent into the mixed solution obtained in the step (2), and stirring at 500-2000r/min to fully mix for 10-20min;
(4) Adding a filler into the mixed solution obtained in the step (3), and fully mixing for 20-30min through stirring at 2000-4000 r/min;
(5) And (4) adding water into the mixed solution obtained in the step (4) to prepare a coating solution with the concentration of 10-20%, and stirring at 1000-2000r/min to fully mix the solution for 5-15min to obtain the thermal insulation coating material for the thermal sensitive paper.
In still another aspect of the present invention, there is provided a thermal paper having the thermal barrier coating material for thermal paper, which is developed by a thermal head to display information to be displayed.
In another aspect, the present invention provides a method for preparing thermal paper having the thermal barrier coating material for thermal paper, the method comprising the steps of:
(1) Coating the thermal-sensitive paper thermal-insulation coating material on the surface of base paper in one mode of air knife coating, blade coating, roller coating, bar coating and curtain coating, and drying to form a thermal-insulation coating on the surface of the base paper;
(2) And coating a layer of heat-sensitive coating material on the heat-insulating coating by using one mode of bar coating, air knife coating and curtain coating on the surface of the base paper with the heat-insulating coating formed on the surface to obtain the finished product of heat-sensitive paper.
In still another aspect of the present invention, there is provided a use of the above thermal barrier coating material for thermal paper for manufacturing thermal paper.
In a further aspect of the invention there is provided the use of foamed microspheres in the preparation of a thermal barrier coating material for thermal paper.
The density of the foamed microspheres used in the invention is 0.1-0.3g/cm 3 The volume hollow rate can reach 97% at most, and the air layer in the middle of the sphere has obvious barrier property for heat conduction due to passing through the gas-solid interface twice. In the thermal paper using the thermal barrier coating material for thermal paper of the present invention, the conduction of heat is significantly suppressed, and the heat is mainly concentrated on the upper portion of the thermal barrier coating. The foamed microspheres in the heat-insulating coating form a compact spherical film, and the dispersed phase of the foamed microspheres is uniformly distributed in the coating.
The thermal conductivity coefficient of the thermal insulation coating material for the thermal paper is gradually reduced along with the increase of the volume content of the microspheres, and the foaming spheres are spherical and uniform and have closed cell structures and are uniformly distributed in the coating to form a compact thermal insulation film.
Within a certain content range, the heat insulation performance of the heat insulation coating material for the thermal paper shows an upward trend along with the increase of the content of the foaming microspheres, and when the highest point is reached, the proportion of the microspheres is increased, so that the heat insulation performance of the heat insulation coating material for the thermal paper is not increased any more, but is reduced. In the process of improving the proportion of microspheres in the initial stage, along with the improvement of the content of the microspheres, the compactness of a coating formed by the heat-insulation coating material for the thermal sensitive paper is gradually improved to form one or more microsphere layers, the heat conductivity coefficient of the whole coating is gradually reduced, and the heat insulation is more obvious after multiple times of barrier effect. When the content of the foamed microspheres reaches a certain value, the content of the foamed microspheres is increased, so that the foamed microspheres cannot be completely filled by the base material under the condition of overhigh content, the void ratio of the spheres is gradually increased, and the gaps are communicated with each other or form closed atmospheric holes to generate air convection, so that the shielding effect on heat is reduced.
Compared with the thermal insulation coating material formed by the existing hollow spheres (such as polystyrene hollow spheres, silicon dioxide hollow spheres, acrylic hollow spheres and the like), the thermal insulation coating material for the thermal paper, which is formed by the foaming microspheres with ultra-small particle size, has a good inhibition effect on heat conduction, can reduce the migration of heat to the raw paper layer, improve the heat energy of the thermal insulation coating, increase the color development sensitivity and color development optical density, and reduce the requirements on a thermal printing head. Increasing the thermal insulation of the coating by reducing its thermal conductivity is an important way to improve the thermal printing performance.
Detailed Description
Aiming at the defects of the thermosensitive heat-insulating material in the prior art, through intensive research, the inventor of the application firstly utilizes the foaming microspheres with ultra-small particle size to prepare the heat-insulating coating material for the thermosensitive paper, and the heat-insulating coating material is used for the thermosensitive paper to improve the color development sensitivity and color development optical density of the thermosensitive coating, and can reach 97 percent at most due to the ultra-high hollow rate of the foaming microspheres, and the inhibition effect on heat energy conduction is obviously superior to that of other barrier materials such as hollow spheres. Meanwhile, the density of the expanded microspheres is 0.1-0.3g/cm 3 The density is only one fifth or less of that of the hollow sphere, the volume filling performance is obvious, and the filling performance of the hollow sphere can be achieved only by a small amount. The present invention has been completed on the basis of this finding.
In the description of the invention, the foaming microspheres with ultra-small particle size are used as the main heat insulation material to form the heat insulation property of the whole coating, and other substances are used as a matrix to form a heat insulation precoat together with the microspheres.
In the description of the invention, the foamed microspheres with ultra-small particle size are formed by a polymer shell and a foaming agent in the polymer shell, and are subjected to certain temperature treatment to form foamed microspheres. Preferably, the particle size D50 of the foamed microspheres is less than 5 micrometers, and the foaming rate is 1-10 times. Preferably, the expanded microspheres have a maximum particle size of less than 35 microns and less than 10% of expanded microspheres having a particle size of 30-35 microns. Preferably, the expanded microspheres have a volume void fraction of 60 to 97%. Preferably, the ratio of the foamed microspheres to the total solid matter is 40 to 70%. The foamed microsphere shell adopts a single-layer or multi-layer structure formed by acrylic ester polymers, and the foaming agent in the foamed microsphere shell is selected from one or more of ethane, propane, isobutane, n-pentane and isopentane. The processing technology of the foamed microspheres used in the invention adopts a pressurizing high-speed homogenizing technology to prepare the foamed microspheres, the pressure is controlled to be 0.4-0.8 kg, the foaming process adopts a screw foaming technology, the temperature is controlled to be 130-170 ℃, and the rotating speed of a screw is 200-400r/min. The invention prepares the foaming microspheres with ultra-small particle size used for the thermal insulation coating material for the thermal sensitive paper, controls the foaming condition of the microspheres by adjusting the foaming process, and realizes the change of different particle sizes and the change of the hollow ratio.
In the description of the present invention, D50 is the particle size (unit: micron), for example, D50 less than 5 microns means that 50% of the particles have a diameter less than 5.
In the description of the invention, the adhesive is used for bonding the foamed microspheres and the filler, and is simultaneously bonded with the raw paper layer to form a uniform precoat layer on the surface of the raw paper layer. Binders useful in the present invention include, but are not limited to, styrene-butadiene latex, styrene-acrylic latex, polyurethane latex, PCV, modified starch.
In the description of the invention, the water-retaining agent mainly acts on the surface of the microsphere to form a layer of water film on the surface of the microsphere, and the water film, other materials and latex form a whole, so that the stability of the microsphere in the whole system is improved, and the problem of layering of the microsphere and other materials is reduced. Water retention agents useful in the present invention include, but are not limited to, polyacrylamide PAM, cellulose, ethylene glycol, propylene glycol.
In the description of the invention, the wetting agent mainly serves to improve the surface tension and permeability of the thermal barrier coating material, so that the wetting agent can better wet the base paper substrate, and thus the adhesion of the thermal barrier coating material is improved. Meanwhile, the coating has a certain dispersing effect on the microspheres and the filler, and the microspheres and the filler are better dispersed by the synergistic dispersing agent, so that the uniformity and the stability of the heat-insulating coating are improved. Wetting agents useful in the present invention include, but are not limited to, alkyl polyoxyethylene ethers, condensates of fatty alcohols with ethylene oxide, alkyl naphthalene sulfonates, silicone-based wetting synergists, and sodium isopropyl naphthalene sulfonate.
In the description of the invention, the dispersing agent is mainly used for improving the dispersibility of the foamed microspheres, reducing the agglomeration of the foamed microspheres, and improving the uniformity and compactness of the whole precoat and the stability of the coating. Dispersants useful in the present invention include, but are not limited to, urethane-modified silanes, di-fatty acids, fatty alcohol-polyoxyethylene ethers, fatty alcohol-ethylene oxide condensates.
In the description of the invention, the defoaming agent is used for eliminating the foaming problem of the system after the surfactant or expandable microspheres are used, affecting the stability of the system and reducing the uneven distribution in the coating process, and affecting the coating. Defoamers useful in the present invention include, but are not limited to, polyether modified silicones, polyethers, non-silicone polymers, modified polymethylsiloxanes, silicones.
In the description of the invention, the filler mainly serves to fill the gaps between the microspheres and improve the compactness of the whole coating. Fillers useful in the present invention include, but are not limited to, calcium carbonate, kaolin, bentonite, talc.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, for which specific conditions are not indicated in the following examples, are generally carried out under conventional conditions, or under conditions recommended by the manufacturer. Percentages are by weight unless otherwise indicated.
The following examples 1-5 used materials of research technology (Shanghai) Inc. (hereinafter referred to as "materials of research technology") have formed microspheres with a structure in which gaseous alkane (n-pentane) is present inside and methacrylic nitrile, butyl acrylate, and methyl methacrylate monomers are homogeneously polymerized into a polymeric shell under a crosslinking agent and an initiator. The foamed microsphere has particle diameter D50 of less than 5 μm, foaming multiplying power of 1-10 times, and minimum density of 0.1g/cm 3 The maximum particle size is less than 35 microns and less than 10%, and the volume hollow ratio of the foamed microsphere is 60-97%.
The hollow spheres in the following comparative examples 1 and 2 were polystyrene plastic pigment (hollow sphere) A-01 product using Wuhan Hill science and technology Limited, with a particle diameter D90 of 1.7 μm and a hollow rate of 60-70%.
Example 1
1.1 the composition of the thermal barrier coating material for thermal paper of this example is shown in table 1 below, and the method for preparing the thermal barrier coating material for thermal paper comprises the following steps:
(1) Adding water into 45 parts by weight of foamed microspheres to prepare a suspension with solid content of 10%, and stirring at 1200r/min to fully and uniformly mix for 30min;
(2) Adding 0.25 weight part of non-silicone polymer defoaming agent (Federal defoamer, B-302/303/304) and 0.60 weight part of fatty alcohol-polyoxyethylene ether dispersing agent (Shenyang Seini Europe chemical Co., ltd., pingping plus 0-25) into the mixed solution obtained in the step (1), and stirring at 3000r/min to fully and uniformly mix for 20min;
(3) Adding 30 parts by weight of modified starch adhesive (MB-D, megaku, calif.), 1 part by weight of sodium carboxymethylcellulose (MB-C1, calif.) water-retaining agent and 2 parts by weight of dioctyl sulfosuccinate sodium salt wetting agent (OT-75, shanghai Yuton chemical Co., ltd.) into the mixed solution obtained in the step (2), and stirring at 1500r/min to fully and uniformly mix for 20min;
(4) Adding 25 parts by weight of light calcium carbonate filler for coating (Yingshou county Jiashuo building materials processing Co., ltd.) into the mixed solution obtained in the step (3), and stirring at 4000r/min to mix thoroughly for 30min;
(5) And (5) adding water into the mixed solution obtained in the step (4) to prepare a coating liquid with the concentration of 15%, and stirring at 2000r/min to fully and uniformly mix the coating liquid for 20min to obtain the thermal insulation coating material for the thermal paper.
1.2 the preparation method of the thermal paper with the thermal insulation coating material for the thermal paper comprises the following steps:
(1) Coating the thermal-sensitive paper thermal-insulation coating material on the surface of base paper in one mode of air knife coating, blade coating, roll coating, rod-scraping coating and curtain coating, and drying to form a thermal-insulation coating layer on the surface of the base paper;
(2) And (3) coating a layer of river paper industry thermal-sensitive coating material on the surface of the paper in the step (1) by one of a bar coating mode, an air knife coating mode and a curtain coating mode to prepare the finished product thermal-sensitive paper.
Comparative example 1
1.1 the thermal barrier coating material for thermal paper of this comparative example, whose composition is shown in Table 1, was prepared by a method comprising the steps of:
(1) Adding water into 45 parts by weight of hollow spheres to prepare a solution with the solid content of 10%, and stirring at 1200r/min to fully and uniformly mix the solution for 30min;
(2) Adding 0.25 weight part of non-silicone polymer defoaming agent (Federal defoamer, B-302/303/304) and 0.60 weight part of fatty alcohol-polyoxyethylene ether dispersing agent (Shenyang Seini Europe chemical Co., ltd., pingping plus 0-25) into the mixed solution obtained in the step (1), and stirring at 3000r/min to fully and uniformly mix for 20min;
(3) Adding 30 parts by weight of modified starch adhesive (MB-D, ma-Bao, jing), 1 part by weight of sodium carboxymethylcellulose (MB-C1, ma-Bao, jing) water-retaining agent and 2 parts by weight of dioctyl sulfosuccinate sodium salt wetting agent (OT-75, shanghai Yuton chemical Co., ltd.) into the mixed solution obtained in the step (2), and stirring at 1500r/min to fully mix the mixture uniformly for 20min;
(4) Adding 25 parts by weight of light calcium carbonate filler for coating (Gao Shu building materials processing Co., ltd., ling shou county) to the mixed solution of the step (3), and mixing thoroughly for 30min by stirring at 4000 r/min;
(5) And (5) adding water into the mixed solution obtained in the step (4) to prepare a coating liquid with the concentration of 15%, and stirring at 2000r/min to fully and uniformly mix the coating liquid for 20min to obtain the thermal insulation coating material for the thermal paper.
1.2 the preparation method of the thermal paper with the thermal insulation coating material for the thermal paper comprises the following steps:
(1) Coating the thermal-sensitive paper thermal-insulation coating material on the surface of base paper in one mode of air knife coating, blade coating, roller coating, bar coating and curtain coating, and drying to form a thermal-insulation coating on the surface of the base paper;
(2) And (3) coating a layer of river paper industry thermal-sensitive coating material on the surface of the paper in the step (1) by adopting one mode of bar coating, air knife coating and curtain coating to prepare the finished product of thermal-sensitive paper.
Example 2
2.1 the composition of the thermal barrier coating material for thermal paper of this example is shown in table 1, and the preparation method of the thermal barrier coating material for thermal paper comprises the following steps:
(1) Adding water into 50 parts by weight of microsphere foaming agent to prepare a solution with solid content of 10%, and stirring at 1500r/min to fully and uniformly mix the solution for 25min;
(2) Adding 0.3 part by weight of non-silicone polymer defoaming agent (Federal defoamer, B-302/303/304) and 0.70 part by weight of fatty alcohol-polyoxyethylene ether dispersing agent (Shenyang Seini Europe chemical Co., ltd., pingping plus 0-25) into the mixed solution obtained in the step (1), and stirring at 3500r/min to fully and uniformly mix for 24min;
(3) Adding 40 parts by weight of modified starch adhesive (MB-D, megaku, calif.), 1 part by weight of sodium carboxymethylcellulose (MB-C1, calif.) water-retaining agent and 1 part by weight of dioctyl sulfosuccinate sodium salt wetting agent (OT-75, shanghai Yuton chemical Co., ltd.) into the mixed solution obtained in the step (2), and stirring at 1500r/min to fully and uniformly mix for 20min;
(4) Adding 10 parts by weight of light calcium carbonate filler for coating (Gaoshuo building materials processing Co., ltd., lingshu county) to the mixed solution of the step (3), and mixing thoroughly for 25min by stirring at 3500 r/min;
(5) And (5) adding water into the mixed solution obtained in the step (4) to prepare a coating liquid with the concentration of 15%, and stirring at 2000r/min to fully and uniformly mix the coating liquid for 20min to obtain the thermal insulation coating material for the thermal paper.
1.2 the preparation method of the thermal paper with the thermal insulation coating material for the thermal paper comprises the following steps:
(1) Coating the thermal-sensitive paper thermal-insulation coating material on the surface of base paper in one mode of air knife coating, blade coating, roll coating, rod-scraping coating and curtain coating, and drying to form a thermal-insulation coating layer on the surface of the base paper;
(2) And (3) coating a layer of river paper industry thermal-sensitive coating material on the surface of the paper in the step (1) by one of a scraper type coating mode, an air knife coating mode and a curtain type coating mode to prepare the finished product thermal-sensitive paper.
Comparative example 2
The composition of the thermal barrier coating material for thermal paper of this comparative example is shown in table 1, and the preparation method of the thermal barrier coating material for thermal paper comprises the steps of:
(1) Adding water into 50 parts by weight of hollow spheres to prepare a solution with the solid content of 10%, and stirring at 1500r/min to fully and uniformly mix the solution for 25min;
(2) Adding 0.3 part by weight of non-silicone polymer defoaming agent (Federal defoamer, B-302/303/304) and 0.70 part by weight of fatty alcohol-polyoxyethylene ether dispersing agent (Shenyang Seini Europe chemical Co., ltd., pingping plus 0-25) into the mixed solution obtained in the step (1), and stirring at 3500r/min to fully and uniformly mix for 24min;
(3) Adding 40 parts by weight of modified starch adhesive (MB-D, ma-Bao, jing), 1 part by weight of sodium carboxymethylcellulose (MB-C1, ma-Bao, jing) water-retaining agent and 1 part by weight of dioctyl sulfosuccinate sodium salt wetting agent (OT-75, shanghai Yuton chemical Co., ltd.) into the mixed solution obtained in the step (2), and stirring at 1500r/min to mix the mixture uniformly for 20min;
(4) Adding 10 parts by weight of light calcium carbonate filler for coating (Gaoshuo building materials processing Co., ltd., lingshu county) to the mixed solution of the step (3), and mixing thoroughly for 25min by stirring at 3500 r/min;
(5) And (4) adding water into the mixed solution obtained in the step (4) to prepare a coating solution with the concentration of 15%, and stirring at 2000r/min to fully and uniformly mix the solution for 20min to obtain the thermal insulation coating material for the thermal sensitive paper.
2.2 the preparation method of the thermal paper with the thermal insulation coating material for the thermal paper comprises the following steps:
(1) Coating the thermal-sensitive paper thermal-insulation coating material on the surface of base paper in one mode of air knife coating, blade coating, roll coating, rod-scraping coating and curtain coating, and drying to form a thermal-insulation coating layer on the surface of the base paper;
(2) And (2) coating a layer of river paper industry heat-sensitive coating material on the surface of the paper in the step (1) by one of a bar coating mode, an air knife coating mode and a curtain coating mode to prepare the finished product heat-sensitive paper.
Example 3
3.1 the composition of the thermal barrier coating material for thermal paper of this example is shown in table 1, and the preparation method of the thermal barrier coating material for thermal paper comprises the following steps:
(1) Adding water into 40 parts by weight of microsphere foaming agent to prepare a solution with solid content of 10%, and stirring at 2000r/min to fully and uniformly mix the solution for 30min;
(2) Sequentially adding 0.4 parts by weight of polyol polyether and fatty acid ether defoamer (Shanghai catalpi chemical Co., ltd., ZY-T1122) and 0.80 part by weight of polycarboxylate dispersant (Shanghai catalpi chemical Co., ltd., ZY-650) into the mixed solution obtained in the step (1), and stirring at 4000r/min to fully and uniformly mix for 25min;
(3) Adding 40 parts by weight of styrene-butadiene latex (C-01) to the mixed solution obtained in the step (2), 2 parts by weight of sodium carboxymethylcellulose (MB-C1) water-retaining agent and 2 parts by weight of dioctyl sulfosuccinate sodium salt wetting agent (OT-75) to the mixed solution, and stirring at 1000r/min to fully and uniformly mix the mixed solution for 30min;
(4) Adding 20 parts by weight of light calcium carbonate filler for coating (Gao Shu building materials processing Co., ltd., ling shou county) to the mixed solution of the step (3), and mixing thoroughly for 30min by stirring at 4000 r/min;
(5) And (5) adding water into the mixed solution obtained in the step (4) to prepare a coating liquid with the concentration of 15%, and stirring at 1500r/min to fully and uniformly mix the coating liquid for 20min to obtain the thermal insulation coating material for the thermal sensitive paper.
3.2 the preparation method of the thermal paper with the thermal insulation coating material for the thermal paper comprises the following steps:
(1) Coating the thermal-sensitive paper thermal-insulation coating material on the surface of base paper in one mode of air knife coating, blade coating, roll coating, rod-scraping coating and curtain coating, and drying to form a thermal-insulation coating layer on the surface of the base paper;
(2) And (3) coating a layer of river paper industry thermal-sensitive coating material on the surface of the paper in the step (1) by one of a bar coating mode, an air knife coating mode and a curtain coating mode to prepare the finished product thermal-sensitive paper.
Example 4
4.1 the thermal barrier coating material for thermal paper of this embodiment has the components shown in table 1, and the preparation method of the thermal barrier coating material for thermal paper comprises the following steps:
(1) Adding water into 55 parts by weight of microsphere foaming agent to prepare a solution with a solid content of 10%, and stirring at 1800r/min to fully and uniformly mix the solution for 25min;
(2) Sequentially adding 0.5 part by weight of polyol polyether and fatty acid ether defoaming agent (model: ZY-T1122, produced by Shanghai catalpi chemical Co., ltd.) and 0.70 part by weight of polycarboxylate dispersant (model: ZY-650, produced by Shanghai catalpi chemical Co., ltd.) into the mixed solution obtained in the step (1), and stirring at 3500r/min to fully and uniformly mix for 20min;
(3) Adding 40 parts by weight of styrene-butadiene latex (C-01, new Material science and technology Co., ltd., jinnan Yanglan), 3 parts by weight of sodium carboxymethylcellulose (produced by Meiba Biotechnology Co., ltd., jingzhou, model: MB-C1) water-retaining agent and 2 parts by weight of dioctyl sulfosuccinate sodium salt wetting agent (produced by Shanghai Yudun chemical Co., ltd., model: OT-75) into the mixed solution obtained in the step (2), and stirring at 1500r/min to fully and uniformly mix the mixture for 25min;
(4) Adding 5 parts by weight of light calcium carbonate filler for coating (produced by Guishou county Jiashuo building materials processing Co., ltd.) into the mixed solution obtained in the step (3), and stirring at 4000r/min to mix thoroughly for 30min;
(5) And (5) adding water into the mixed solution obtained in the step (4) to prepare a coating liquid with the concentration of 15%, and stirring at 2000r/min to fully and uniformly mix the coating liquid for 20min to obtain the thermal insulation coating material for the thermal paper.
4.2 the preparation method of the thermal paper with the thermal insulation coating material for the thermal paper comprises the following steps:
() Coating the thermal-sensitive paper thermal-insulation coating material on the surface of base paper by one of air knife coating, scraper coating, roller coating, bar coating and curtain coating, and drying to form a thermal-insulation coating on the surface of the base paper;
(2) And (2) coating a layer of river paper industry heat-sensitive coating material on the surface of the paper in the step (1) by one of a bar coating mode, an air knife coating mode and a curtain coating mode to prepare the finished heat-sensitive paper.
Example 5
5.1 the thermal barrier coating material for thermal paper of this example has the components shown in table 1, and the preparation method of the thermal barrier coating material for thermal paper comprises the following steps:
(1) Adding water into 60 parts by weight of microsphere foaming agent to prepare a solution with solid content of 10%, and stirring at 2000r/min to fully and uniformly mix for 30min;
(2) Sequentially adding 0.5 part by weight of polyol polyether and fatty acid ether defoaming agent (Shanghai catalpi chemical Co., ltd., ZY-T1122) and 0.70 part by weight of polycarboxylate dispersing agent (Shanghai catalpi chemical Co., ltd., ZY-650) into the mixed solution obtained in the step (1), and stirring at 3500r/min to fully and uniformly mix for 30min;
(3) Adding 35 parts by weight of styrene-butadiene latex (C-01) to the mixed solution obtained in the step (2), 2 parts by weight of sodium carboxymethylcellulose (MB-C1) water-retaining agent and 3 parts by weight of dioctyl sulfosuccinate sodium salt wetting agent (OT-75) to the mixed solution, and stirring at 1500r/min to fully and uniformly mix the mixed solution for 30min;
(4) Adding 5 parts by weight of light calcium carbonate filler for coating (Yingshou county Jiashuo building materials processing Co., ltd.) into the mixed solution obtained in the step (3), and stirring at 4000r/min to mix thoroughly for 25min;
(5) And (5) adding water into the mixed solution obtained in the step (4) to prepare a coating liquid with the concentration of 15%, and stirring at 2000r/min to fully and uniformly mix the coating liquid for 20min to obtain the thermal insulation coating material for the thermal paper.
5.2 the preparation method of the thermal paper with the thermal insulation coating material for the thermal paper comprises the following steps:
(1) Coating the thermal-sensitive paper thermal-insulation coating material on the surface of base paper in one mode of air knife coating, blade coating, roller coating, bar coating and curtain coating, and drying to form a thermal-insulation coating on the surface of the base paper;
(2) And (3) coating a layer of river paper industry thermal-sensitive coating material on the surface of the paper in the step (1) by one of a bar coating mode, an air knife coating mode and a curtain coating mode to prepare the finished product thermal-sensitive paper.
TABLE 1 Components and amounts (parts by weight) of thermal barrier coating materials of examples 1 to 5 and comparative examples 1 to 2
Performance detection
The inventors tested the static optical density data and dynamic color sensitivity data (performed according to the GB/T28210-2011 performance test standard of the thermal paper) of the thermal paper prepared in the above examples and comparative examples, and analyzed the static optical density data and the dynamic color sensitivity data under different proportioning conditions, and the detailed data are shown in Table 2.
TABLE 2 Performance data of thermal papers obtained in examples 1 to 5 and comparative examples 1 to 2
The thermal paper coating test data for example 1 and comparative example 1 in table 2 illustrate in comparison: under the condition that other components are consistent, the foamed microspheres are adopted to replace hollow spheres for the thermosensitive precoating layer, under the condition that the coating weight is consistent, both static state saturated color-emitting light density data and dynamic color development sensitivity data are obviously improved, the static state saturated color-emitting light density data are improved by 21.6%, and the energy level of the dynamic color development sensitivity is reduced by 2 grades (the lower the energy level of the color development sensitivity is, the better the color development sensitivity is). The thermal paper coating test data of example 2 and comparative example 2 illustrate in comparison: under the condition that other components are consistent, the foamed microspheres are adopted to replace hollow spheres for the thermosensitive precoating layer, under the condition that the coating weight is consistent, the static saturated luminous color density data and the dynamic color development sensitivity data are obviously improved, the static saturated luminous color density data are improved by 17.4%, and the energy level of the dynamic color development sensitivity is reduced by 3 grades.
The comparison between the above comparative example and the example shows that the foamed microspheres are used as the heat insulation auxiliary agent in the thermal paper precoating instead of the hollow spheres, so that the static and dynamic optical density data are obviously improved, clear color development can be achieved at a lower energy level, the color depth of the color development is improved, the energy level can be reduced by 3 levels at most, and the color development optical density can be improved by about 21%.
The data of the embodiment 1, the embodiment 2, the embodiment 3, the embodiment 4 and the embodiment 5 are compared and explained as follows: the higher the content of the foamed microspheres is, the more obviously the static saturated luminous color density is improved. Compared with hollow spheres, the energy level of the dynamic color development sensitivity can be improved by 3 levels, so that the energy output of the thermal printing head is reduced, the abrasion degree of the thermal printing head is reduced, and the color development sensitivity and the color development optical density are improved. The coating weight for the precoat in examples 4 and 5 was from 2g/m 2 The reduction is 1.5g/m 2 25% of the precoat material was saved, but both the dynamic coloration sensitivity and the static coloration optical density data were higher than those of the hollow spheres of comparative example 1 and comparative example 2. The energy level of the dynamic color development sensitivity is still reduced by 2 grades, and the optical density data of the static color development is also improved by about 11%.
According to the invention, the foamed microspheres are used as the heat insulation auxiliary agent instead of hollow spheres, so that the color rendering property of the thermal sensitive paper is obviously improved. Due to the ultrahigh porosity of the foaming microsphere, the highest porosity can reach 97%, and the inhibition effect on the heat conduction is obviously superior to that of other barrier materials such as hollow spheres and the like. Meanwhile, the density of the expanded microspheres is 0.1-0.3g/cm 3 The density is only one fifth or less of that of the hollow sphere, the volume filling performance is obvious, and the filling performance of the hollow sphere can be achieved only by a small amount. After the gas-solid interface passes twice, the air layer in the middle of the sphere has obvious barrier property for heat conduction, the heat conduction is obviously inhibited, and the heat is mainly concentrated on the upper part of the microsphere coating. The foaming microspheres in the heat insulation layer form a compact spherical film, and the dispersed phase of the foaming microspheres is uniformly distributed in the coating layer. The thermal conductivity of the thermal barrier coating material for thermal paper of the present invention gradually decreases as the volume content of microspheres increases. Because the foaming balls are spherical and have a controllable closed-cell structure and are uniformly distributed in the coating, a compact heat-insulating film is formed. Compared with hollow spheres, the hollow sphere has obvious advantages and can be used as a heat insulation auxiliary agent.
Heat-sensitive partition for prior artThe inventor of the application conducts deep research, and the foaming microspheres with ultra-small particle size are used for the first time to improve the color development sensitivity and definition of the thermosensitive coating, the highest porosity of the foaming microspheres can reach 97%, and the inhibition effect on heat energy conduction is obviously better than that of other barrier materials such as hollow spheres. Meanwhile, the density of the expanded microspheres is 0.1-0.3g/cm 3 The density is only one fifth or less of that of the hollow sphere, the volume filling performance is obvious, and the filling performance of the hollow sphere can be achieved only by a small amount. The present invention has been completed based on this finding.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (8)
1. The thermal insulation coating material for the thermal paper is characterized by comprising the following raw materials in parts by weight:
30 to 60 portions of heat-insulating microspheres,
20-40 parts of an adhesive agent,
1-3 parts of a water-retaining agent,
1-4 parts of a wetting agent,
0.5 to 1 portion of dispersant,
0.1 to 0.5 portion of defoaming agent,
5-30 parts of a filler,
the heat insulation microspheres are foamed microspheres,
the water retention agent is selected from one or a mixture of more of polyacrylamide PAM, cellulose, ethylene glycol and propylene glycol,
the particle size of the foamed microsphere particles is D50 less than 5 microns, and the maximum particle size is less than 35 microns.
2. The thermal insulation coating material for thermal paper according to claim 1, wherein the binder is one or a mixture of styrene-butadiene latex, styrene-acrylic latex, acrylic emulsion, polyurethane emulsion and modified starch.
3. The thermal barrier coating material for thermal paper according to claim 1, wherein the wetting agent is one or more selected from the group consisting of alkyl polyoxyethylene ether, a condensate of a fatty alcohol and ethylene oxide, alkyl naphthalene sulfonate, a silicone wetting synergist, and sodium isopropyl naphthalene sulfonate.
4. The thermal insulation coating material for thermal paper as claimed in claim 1, wherein the dispersant is selected from one or more of polyurethane modified silane, di-fatty acid, fatty alcohol-polyoxyethylene ether, and condensation product of fatty alcohol and ethylene oxide.
5. The thermal barrier coating material for thermal paper according to claim 1, wherein the defoaming agent is one or a mixture of polyether-modified silicones, polyethers, non-silicone polymers, modified polymethylsiloxanes, and silicones.
6. The thermal insulation coating material for thermal paper according to claim 1, wherein the filler is one or a mixture of calcium carbonate, kaolin, bentonite and talcum powder.
7. The method for preparing a thermal barrier coating material for thermal paper according to any one of claims 1 to 6, comprising the steps of:
(1) Adding water into the heat insulation microspheres to prepare a solution with 10% solid content, and stirring at 1000-2000r/min to fully mix the solution for 20-30min;
(2) Sequentially adding a defoaming agent and a dispersing agent into the mixed solution in the step (1), and fully mixing for 20-30min through stirring at 1000-5000 r/min;
(3) Adding an adhesive, a water-retaining agent and a wetting agent into the mixed solution obtained in the step (2), and stirring at 500-2000r/min to fully mix for 10-20min;
(4) Adding a filler into the mixed solution obtained in the step (3), and fully mixing for 20-30min through stirring at 2000-4000 r/min;
(5) And (5) adding water into the mixed solution obtained in the step (4) to prepare a coating solution with the concentration of 10-20%, and stirring at 1000-2000r/min to fully mix the solution for 5-15min to obtain the thermal insulation coating material for the thermal sensitive paper.
8. Thermal paper having the thermal barrier coating material for thermal paper according to any one of claims 1 to 6.
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| US5106813A (en) * | 1989-10-27 | 1992-04-21 | Mitsui Toatsu Chemicals, Incorporated | Thermosensitive recording material |
| CN104060494A (en) * | 2014-05-09 | 2014-09-24 | 湖南恒瀚高新技术有限公司 | Multi-proof thermosensitive paper free of top coating and manufacture process thereof |
| CN106676972A (en) * | 2016-12-22 | 2017-05-17 | 江苏万宝瑞达高新技术有限公司 | Thermal sensitive paper with invisible fluorescence developing function |
| CN111909575A (en) * | 2020-07-02 | 2020-11-10 | 广东嘉宝莉科技材料有限公司 | Paint capable of forming elastic coating and preparation method thereof |
| CN112647345A (en) * | 2020-12-23 | 2021-04-13 | 快思瑞科技(上海)有限公司 | Heat-insulating thermal paper precoating and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5106813A (en) * | 1989-10-27 | 1992-04-21 | Mitsui Toatsu Chemicals, Incorporated | Thermosensitive recording material |
| CN104060494A (en) * | 2014-05-09 | 2014-09-24 | 湖南恒瀚高新技术有限公司 | Multi-proof thermosensitive paper free of top coating and manufacture process thereof |
| CN106676972A (en) * | 2016-12-22 | 2017-05-17 | 江苏万宝瑞达高新技术有限公司 | Thermal sensitive paper with invisible fluorescence developing function |
| CN111909575A (en) * | 2020-07-02 | 2020-11-10 | 广东嘉宝莉科技材料有限公司 | Paint capable of forming elastic coating and preparation method thereof |
| CN112647345A (en) * | 2020-12-23 | 2021-04-13 | 快思瑞科技(上海)有限公司 | Heat-insulating thermal paper precoating and preparation method thereof |
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