CN113308194A - Printing heat-sensitive coating and preparation method and application thereof - Google Patents
Printing heat-sensitive coating and preparation method and application thereof Download PDFInfo
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- CN113308194A CN113308194A CN202110597131.2A CN202110597131A CN113308194A CN 113308194 A CN113308194 A CN 113308194A CN 202110597131 A CN202110597131 A CN 202110597131A CN 113308194 A CN113308194 A CN 113308194A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D187/00—Coating compositions based on unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
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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
- B41M5/34—Multicolour thermography
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/26—Thermosensitive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- 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
- B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Abstract
The invention relates to a printing heat-sensitive coating and a preparation method and application thereof, belonging to the technical field of heat-sensitive materials. The preparation method comprises the following steps: taking 2-5 parts of emulsifier, 5-20 parts of prepolymer and 70-90 parts of water to obtain a water phase; taking 5-20 parts of thermosensitive dye, 0.1-1 part of initiator, 0.5-1 part of anti-UV auxiliary agent and 50-100 parts of butanone to obtain an oil phase; adding the water phase into the oil phase, stirring, introducing nitrogen, and heating for reaction to obtain a heat-sensitive microcapsule solution; and (2) adding 2-10 parts of heat stabilizer, 1-3 parts of lubricant, 5-10 parts of dispersant and 2-20 parts of developer into 20-80 parts of thermosensitive microcapsule solution, and uniformly mixing to obtain the printing thermosensitive coating. The invention also provides the printing heat-sensitive paint prepared by the preparation method and application thereof. The printing thermosensitive paint solves the problems of fast fading, difficult preservation and the like when the inkless printing paper is stored.
Description
Technical Field
The invention belongs to the technical field of thermosensitive materials, and particularly relates to a printing thermosensitive coating as well as a preparation method and application thereof.
Background
The inkless printing paper is a printing paper that does not require ink. The inkless printing paper can quickly print black pictures and texts, and is widely applied to industries such as logistics express delivery, labels, lottery tickets, supermarkets, banks and the like. The inkless printing paper is mainly made of heat-sensitive paint.
However, the heat-sensitive paint in the prior art is easy to fade rapidly when stored in a wet state at room temperature or slightly high temperature, and the use of the inkless printing paper is influenced.
Disclosure of Invention
The invention provides a printing heat-sensitive coating and a preparation method and application thereof for solving the technical problems that the inkless printing paper is fast faded and is not easy to store when being stored in a humid state at room temperature or slightly high temperature, and the like.
The invention provides a preparation method of a printing heat-sensitive coating for solving the technical problems.
The technical scheme for solving the technical problems is as follows: a preparation method of a printing heat-sensitive paint comprises the following steps:
s1, uniformly mixing 2-5 parts of emulsifier, 5-20 parts of prepolymer and 70-90 parts of water to obtain a water phase;
s2, uniformly mixing 5-20 parts of thermal dye, 0.1-1 part of initiator, 0.5-1 part of anti-UV auxiliary agent and 50-100 parts of butanone to obtain an oil phase;
s3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, heating for reaction, and removing the solvent to obtain a heat-sensitive microcapsule solution;
s4, taking 20-80 parts of the heat-sensitive microcapsule solution obtained in the step S3, adding 2-10 parts of heat stabilizer, 1-3 parts of lubricant and 5-10 parts of dispersant, and stirring and mixing uniformly to obtain a component A;
s5, taking 1-3 parts of lubricant, 5-10 parts of dispersant and 2-30 parts of developer, stirring and grinding to obtain a component B;
s6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
The preparation method of the invention has the beneficial effects that: (1) the preparation method is simple and easy to operate, does not need excessive repeated operation, and is suitable for industrial large-scale production;
(2) the printing heat-sensitive paint prepared by the preparation method overcomes the problem of easy fading during storage in a high-humidity state at room temperature or above, and ensures the storage of printing information.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in step S1, the emulsifier is one or more of a mixture of gum arabic, polyvinyl alcohol, span 20 and tween 80.
Further, in step S1, the prepolymer is a block copolymer of polyethylene glycol and one or more of polyethylene glycol dimethacrylate, polycaprolactam, and poly N-isopropylacrylamide.
Further, in step S2, the thermosensitive dye is one or a mixture of two of a benzoic acid lactone compound and a violet lactone compound.
Further, in step S2, the initiator is one or a mixture of two of azobisisobutyronitrile and diacyl peroxide; the anti-UV auxiliary agent is a Basff ultraviolet absorbent.
Further, in step S3, the heating reaction temperature is 40-90 ℃ and the reaction time is 0.5-8 h.
Further, in step S4, the heat stabilizer is one or a mixture of two of phosphite and zinc stearate.
Further, in step S4, the lubricant is one or more of fatty acid amide, oleic acid and polyester; the color-developing agent is bisphenol A or p-hydroxybenzoic acid.
Secondly, the invention provides a printing heat-sensitive paint for solving the technical problems.
The technical scheme for solving the technical problems is as follows: the printing thermal sensitive coating prepared by the preparation method of the printing thermal sensitive coating is provided.
The printing heat-sensitive paint has the beneficial effects that: the problem that the printing ink is easy to fade when stored in a high-humidity state at room temperature or above is solved, and the storage of the printing information is ensured; meanwhile, the printing heat-sensitive coating is conveniently used for preparing a coating, realizes inkless printing and has wide application.
Thirdly, the invention provides an application of the printing heat-sensitive paint for solving the technical problems.
The technical scheme for solving the technical problems is as follows: the application of the printing heat-sensitive paint in preparing inkless printing paper.
The application of the invention has the beneficial effects that: the inkless printing paper can print simple black pictures and texts and can also realize the printing of colorful pictures and texts with bright colors.
Detailed Description
The principles and features of this invention are described in conjunction with the following examples, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1
The embodiment provides a preparation method of a printing heat-sensitive paint, which comprises the following steps:
s1, taking 2 parts of gum arabic, 10 parts of block copolymer of polyethylene glycol dimethacrylate and polyethylene glycol and 70 parts of water, and uniformly mixing to obtain a water phase.
S2, taking 10 parts of a benzoic acid lactone compound, 0.1 part of azobisisobutyronitrile, 0.5 part of a BASVIN 460 absorbent and 60 parts of butanone, and uniformly mixing to obtain an oil phase.
S3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, reacting for 1 hour at 50 ℃, and removing the solvent by adopting a reduced pressure distillation mode after the reaction is finished to obtain the heat-sensitive microcapsule solution.
S4, taking 30 parts of the thermosensitive microcapsule solution obtained in the step S3, adding 4 parts of phosphite ester, 1 part of fatty acid amide and 5 parts of dispersant BYK019, and stirring and mixing uniformly to obtain a component A.
S5, taking 2 parts of fatty acid amide, 5 parts of dispersant BYK019 and 5 parts of bisphenol A, stirring and grinding the mixture until the particle size is 5um to obtain a component B.
S6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
The embodiment also provides a printing thermal-sensitive paint prepared by the preparation method of the printing thermal-sensitive paint.
The embodiment also provides application of the printing thermal-sensitive paint in preparation of inkless printing paper.
The application specifically relates to a color inkless printing paper which comprises a base material layer, a precoating layer, a cyan coating layer, a red coating layer, a yellow coating layer and a protective layer which are sequentially arranged from bottom to top. Wherein the cyan coating, the red coating and the yellow coating are prepared by adding the pigment into the printing heat-sensitive paint prepared by the method. Wherein, the thickness of the yellow coating is 5-30 μm, the thickness of the red coating is 5-30 μm, and the thickness of the cyan coating is 5-30 μm. The thickness of the protective layer is 10-20 μm.
Example 2
The embodiment provides a preparation method of a printing heat-sensitive paint, which comprises the following steps:
s1, taking 5 parts of polyvinyl alcohol, 15 parts of block copolymer of polycaprolactam and polyethylene glycol and 90 parts of water, and uniformly mixing to obtain a water phase.
S2, taking 20 parts of violet lactone compound, 1 part of diacyl peroxide, 1 part of a basf ultraviolet absorbent tinuvin460 and 100 parts of butanone, and uniformly mixing to obtain an oil phase.
S3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, reacting for 6 hours at 90 ℃, and removing the solvent by adopting a reduced pressure distillation mode after the reaction is finished to obtain the heat-sensitive microcapsule solution.
S4, adding 10 parts of zinc stearate, 3 parts of oleic acid and 10 parts of dispersant BYK2102 into 80 parts of the thermosensitive microcapsule solution obtained in the step S3, and uniformly stirring and mixing to obtain a component A.
S5, taking 2 parts of oleic acid, 7 parts of dispersant BYK2102 and 20 parts of p-hydroxybenzoic acid, stirring and grinding the mixture until the particle size is 8um to obtain a component B.
S6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
The embodiment also provides a printing thermal-sensitive paint prepared by the preparation method of the printing thermal-sensitive paint.
The embodiment also provides application of the printing thermal-sensitive paint in preparation of inkless printing paper.
The application specifically relates to a color inkless printing paper which comprises a base material layer, a precoating layer, a cyan coating layer, a red coating layer, a yellow coating layer and a protective layer which are sequentially arranged from bottom to top. Wherein the cyan coating, the red coating and the yellow coating are prepared by adding the pigment into the printing heat-sensitive paint prepared by the method. Wherein, the thickness of the yellow coating is 5-30 μm, the thickness of the red coating is 5-30 μm, and the thickness of the cyan coating is 5-30 μm. The thickness of the protective layer is 10-20 μm.
Example 3
The embodiment provides a preparation method of a printing heat-sensitive paint, which comprises the following steps:
s1, taking 4 parts of span 20, 15 parts of block copolymer of poly N-isopropyl acrylamide and polyethylene glycol and 85 parts of water, and uniformly mixing to obtain a water phase.
S2, taking 15 parts of a benzoic acid lactone compound, 0.8 part of diacyl peroxide, 0.9 part of a basf ultraviolet absorbent tinuvin152 and 90 parts of butanone, and uniformly mixing to obtain an oil phase.
S3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, reacting for 8 hours at 70 ℃, and removing the solvent by adopting a reduced pressure distillation mode after the reaction is finished to obtain the heat-sensitive microcapsule solution.
S4, adding 8 parts of phosphite ester, 3 parts of polyester and 8 parts of dispersant BYK019 into 50 parts of the thermosensitive microcapsule solution obtained in the step S3, and uniformly stirring and mixing to obtain a component A.
S5, taking 1 part of polyester, 10 parts of dispersant BYK019 and 18 parts of bisphenol A, stirring and grinding the mixture until the particle size is 5um, and obtaining a component B.
S6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
The embodiment also provides a printing thermal-sensitive paint prepared by the preparation method of the printing thermal-sensitive paint.
The embodiment also provides application of the printing thermal-sensitive paint in preparation of inkless printing paper.
The application specifically relates to a color inkless printing paper which comprises a base material layer, a precoating layer, a cyan coating layer, a red coating layer, a yellow coating layer and a protective layer which are sequentially arranged from bottom to top. Wherein the cyan coating, the red coating and the yellow coating are prepared by adding the pigment into the printing heat-sensitive paint prepared by the method. Wherein, the thickness of the yellow coating is 5-30 μm, the thickness of the red coating is 5-30 μm, and the thickness of the cyan coating is 5-30 μm. The thickness of the protective layer is 10-20 μm.
Example 4
The embodiment provides a preparation method of a printing heat-sensitive paint, which comprises the following steps:
s1, taking 4 parts of Tween 80, 12 parts of block copolymer of polyethylene glycol dimethacrylate and polyethylene glycol and 75 parts of water, and uniformly mixing to obtain a water phase.
S2, taking 15 parts of one or a mixture of two of a benzoic acid lactone compound and a violet lactone compound, 0.6 part of diacyl peroxide, 0.7 part of a basf ultraviolet absorbent tinuvin152 and 80 parts of butanone, and uniformly mixing to obtain an oil phase.
S3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, reacting for 4 hours at 50 ℃, and removing the solvent by adopting a reduced pressure distillation mode after the reaction is finished to obtain the heat-sensitive microcapsule solution.
S4, taking 45 parts of the thermosensitive microcapsule solution obtained in the step S3, adding 6 parts of zinc stearate, 2 parts of fatty acid amide and 6 parts of dispersant BYK2102, and stirring and mixing uniformly to obtain a component A.
S5, taking 3 parts of fatty acid amide, 8 parts of dispersant BYK2102 and 8 parts of p-hydroxybenzoic acid and derivatives thereof, stirring and grinding the mixture until the particle size is 5um to obtain a component B.
S6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
The embodiment also provides a printing thermal-sensitive paint prepared by the preparation method of the printing thermal-sensitive paint.
The embodiment also provides application of the printing thermal-sensitive paint in preparation of inkless printing paper.
The application specifically relates to a color inkless printing paper which comprises a base material layer, a precoating layer, a cyan coating layer, a red coating layer, a yellow coating layer and a protective layer which are sequentially arranged from bottom to top. Wherein the cyan coating, the red coating and the yellow coating are prepared by adding the pigment into the printing heat-sensitive paint prepared by the method. Wherein, the thickness of the yellow coating is 5-30 μm, the thickness of the red coating is 5-30 μm, and the thickness of the cyan coating is 5-30 μm. The thickness of the protective layer is 10-20 μm.
Example 5
The embodiment provides a preparation method of a printing heat-sensitive paint, which comprises the following steps:
s1, 3 parts of gum arabic, 18 parts of a block copolymer of polycaprolactam and polyethylene glycol and 75 parts of water are uniformly mixed to obtain a water phase.
S2, taking 10 parts of violet lactone compound, 0.3 part of azobisisobutyronitrile, 0.5-1 part of a basf ultraviolet absorbent, tinuvin460 and 55 parts of butanone, and uniformly mixing to obtain an oil phase.
S3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, reacting for 2 hours at 50 ℃, and removing the solvent by adopting a reduced pressure distillation mode after the reaction is finished to obtain the heat-sensitive microcapsule solution.
S4, adding 3 parts of phosphite ester, 1 part of polyester and 7 parts of dispersant BYK019 into 30 parts of the thermosensitive microcapsule solution obtained in the step S3, and uniformly stirring and mixing to obtain a component A.
S5, taking 3 parts of polyester, 10 parts of dispersant BYK019 and 6 parts of bisphenol A, stirring and grinding the mixture until the particle size is 5um, and obtaining a component B.
S6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
The embodiment also provides a printing thermal-sensitive paint prepared by the preparation method of the printing thermal-sensitive paint.
The embodiment also provides application of the printing thermal-sensitive paint in preparation of inkless printing paper.
The application specifically relates to a color inkless printing paper which comprises a base material layer, a precoating layer, a cyan coating layer, a red coating layer, a yellow coating layer and a protective layer which are sequentially arranged from bottom to top. Wherein the cyan coating, the red coating and the yellow coating are prepared by adding the pigment into the printing heat-sensitive paint prepared by the method. Wherein, the thickness of the yellow coating is 5-30 μm, the thickness of the red coating is 5-30 μm, and the thickness of the cyan coating is 5-30 μm. The thickness of the protective layer is 10-20 μm.
Example 6
The embodiment provides a preparation method of a printing heat-sensitive paint, which comprises the following steps:
s1, taking 4 parts of gum arabic, 14 parts of block copolymer of poly-N-isopropylacrylamide and polyethylene glycol and 70 parts of water, and uniformly mixing to obtain a water phase.
S2, uniformly mixing 5 parts of violet lactone compound, 0.4 part of azobisisobutyronitrile, 0.6 part of a basf ultraviolet absorbent tinuvin460 and 60 parts of butanone to obtain an oil phase.
S3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, reacting for 1 hour at 80 ℃, and removing the solvent by adopting a reduced pressure distillation mode after the reaction is finished to obtain the heat-sensitive microcapsule solution.
S4, taking 40 parts of the heat-sensitive microcapsule solution obtained in the step S3, adding 5 parts of zinc stearate, 2 parts of fatty acid amide and 6 parts of dispersant BYK2102, and stirring and mixing uniformly to obtain a component A.
S5, taking 1 part of fatty acid amide, 9 parts of dispersant BYK2102 and 16 parts of p-hydroxybenzoic acid, stirring and grinding the mixture until the particle size is 5um to obtain a component B.
S6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
The embodiment also provides a printing thermal-sensitive paint prepared by the preparation method of the printing thermal-sensitive paint.
The embodiment also provides application of the printing thermal-sensitive paint in preparation of inkless printing paper.
The application specifically relates to a color inkless printing paper which comprises a base material layer, a precoating layer, a cyan coating layer, a red coating layer, a yellow coating layer and a protective layer which are sequentially arranged from bottom to top. Wherein the cyan coating, the red coating and the yellow coating are prepared by adding the pigment into the printing heat-sensitive paint prepared by the method. Wherein, the thickness of the yellow coating is 5-30 μm, the thickness of the red coating is 5-30 μm, and the thickness of the cyan coating is 5-30 μm. The thickness of the protective layer is 10-20 μm.
Example 7
The embodiment provides a preparation method of a printing heat-sensitive paint, which comprises the following steps:
s1, taking 5 parts of polyvinyl alcohol, 8 parts of block copolymer of polyethylene glycol dimethacrylate and polyethylene glycol and 70 parts of water, and uniformly mixing to obtain a water phase.
S2, taking 6 parts of a benzoic acid lactone compound, 0.5 part of diacyl peroxide, 0.8 part of a basf ultraviolet absorbent tinuvin152 and 85 parts of butanone, and uniformly mixing to obtain an oil phase.
S3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, reacting for 3 hours at 45 ℃, and removing the solvent by adopting a reduced pressure distillation mode after the reaction is finished to obtain the heat-sensitive microcapsule solution.
S4, taking 70 parts of the heat-sensitive microcapsule solution obtained in the step S3, adding 6 parts of phosphite ester, 3 parts of polyester and 6 parts of dispersant BYK2102, and stirring and mixing uniformly to obtain a component A.
S5, taking 1 part of polyester, 5 parts of dispersant BYK2102 and 16 parts of p-hydroxybenzoic acid, stirring and grinding the mixture until the particle size is 5um to obtain a component B.
S6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
The embodiment also provides a printing thermal-sensitive paint prepared by the preparation method of the printing thermal-sensitive paint.
The embodiment also provides application of the printing thermal-sensitive paint in preparation of inkless printing paper.
The application specifically relates to a color inkless printing paper which comprises a base material layer, a precoating layer, a cyan coating layer, a red coating layer, a yellow coating layer and a protective layer which are sequentially arranged from bottom to top. Wherein the cyan coating, the red coating and the yellow coating are prepared by adding the pigment into the printing heat-sensitive paint prepared by the method. Wherein, the thickness of the yellow coating is 5-30 μm, the thickness of the red coating is 5-30 μm, and the thickness of the cyan coating is 5-30 μm. The thickness of the protective layer is 10-20 μm.
Examples of the experiments
The color inkless printing paper prepared in the example 1 is printed under the same condition as the existing color inkless printing paper, and after the printing is finished, the color inkless printing paper is irradiated for 720 hours under ultraviolet light, wherein the illumination intensity of the ultraviolet light is 0.76W/cm2The test temperature is 50 +/-2 ℃ and the humidity is 50 +/-10%.
The existing color inkless printing paper fades within one week of illumination, while the color inkless printing paper prepared in the embodiment 1 still does not fade within one month of illumination.
Therefore, the color inkless printing paper prepared by the invention overcomes the problem of easy fading in high-humidity storage at room temperature and above, and ensures the storage of printing information.
It is to be noted that "comprising" in the present invention means that it may include other components in addition to the components described, and the "comprising" may be replaced with "being" or "consisting of … …" in a closed manner.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A preparation method of a printing heat-sensitive paint is characterized by comprising the following steps:
s1, uniformly mixing 2-5 parts of emulsifier, 5-20 parts of prepolymer and 70-90 parts of water to obtain a water phase;
s2, uniformly mixing 5-20 parts of thermal dye, 0.1-1 part of initiator, 0.5-1 part of anti-UV auxiliary agent and 50-100 parts of butanone to obtain an oil phase;
s3, adding the water phase obtained in the step S1 into the oil phase obtained in the step S2, stirring to form an emulsion, introducing nitrogen, heating for reaction, and removing the solvent to obtain a heat-sensitive microcapsule solution;
s4, taking 20-80 parts of the heat-sensitive microcapsule solution obtained in the step S3, adding 2-10 parts of heat stabilizer, 1-3 parts of lubricant and 5-10 parts of dispersant, and stirring and mixing uniformly to obtain a component A;
s5, taking 1-3 parts of lubricant, 5-10 parts of dispersant and 2-30 parts of developer, stirring and grinding to obtain a component B;
s6, uniformly mixing the component A and the component B according to the ratio of 1: 1 to obtain the printing heat-sensitive coating.
2. The method for preparing a printing thermal sensitive coating according to claim 1, wherein in step S1, the emulsifier is one or more of a mixture of gum arabic, polyvinyl alcohol, span 20 and tween 80.
3. The method of claim 1, wherein in step S1, the prepolymer is a block copolymer of polyethylene glycol and one or more of polyethylene glycol dimethacrylate, polycaprolactam, and poly N-isopropylacrylamide.
4. The method for preparing a printing thermal sensitive paint according to claim 1, wherein in step S2, the thermal sensitive dye is one or a mixture of two of a benzoic acid lactone compound and a violet lactone compound.
5. The method for preparing a printing thermal sensitive coating according to claim 1, wherein in step S2, the initiator is one or a mixture of two of azobisisobutyronitrile and diacyl peroxide; the anti-UV auxiliary agent is a Basff ultraviolet absorbent.
6. The method for preparing a printing heat-sensitive paint according to any one of claims 1 to 5, wherein in step S3, the temperature of the heating reaction is 40-90 ℃ and the reaction time is 0.5-8 h.
7. The method of any one of claims 1-5, wherein in step S4, the heat stabilizer is one or a mixture of phosphite and zinc stearate.
8. The method of preparing a printing thermal sensitive coating according to any of claims 1-5, wherein in steps S4 and S5, the lubricant is one or a mixture of more of fatty acid amide, oleic acid and polyester; the color-developing agent is bisphenol A or p-hydroxybenzoic acid.
9. A printing thermal sensitive paint prepared by the method for preparing a printing thermal sensitive paint according to any one of claims 1 to 8.
10. Use of the printing thermal sensitive coating of claim 9 in the preparation of inkless printing paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110597131.2A CN113308194B (en) | 2021-05-28 | 2021-05-28 | Printing heat-sensitive coating and preparation method and application thereof |
Applications Claiming Priority (1)
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| CN113774717A (en) * | 2021-09-22 | 2021-12-10 | 湖南鼎一致远科技发展有限公司 | Thermosensitive dye microcapsule material, preparation method and thermosensitive coating |
| CN114250644A (en) * | 2021-12-30 | 2022-03-29 | 北京鼎一致远科技发展有限公司 | Precoating coating for thermal printing paper, and preparation method and application thereof |
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| CN114250644A (en) * | 2021-12-30 | 2022-03-29 | 北京鼎一致远科技发展有限公司 | Precoating coating for thermal printing paper, and preparation method and application thereof |
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