阅读说明：本技术 一种覆膜热敏纸及其加工工艺 (kinds of film-coated heat-sensitive paper and processing technology thereof ) 是由 魏玉波 杨南 邓丽娟 翟素慧 吴森 抄东枝 于 2019-10-24 设计创作，主要内容包括：本发明尝试通过覆膜技术解决现有热敏纸打印存在的问题,提供一种覆膜热敏纸及其加工工艺,所述覆膜热敏纸包括纸基以及涂布于所述纸基表面的热敏显色剂层,还包括薄膜层,且所述薄膜层的一侧涂布热敏染料层、另一侧涂布润滑层,且所述薄膜层以所述热敏染料层朝向所述热敏显色剂层的方式通过覆膜工艺复合于所述纸基的表面；本发明相较于现有的热敏纸,覆膜热敏纸表现出更高的爽滑性、耐刮擦性、耐物化腐蚀性、耐候耐久性、更小的热损伤,且无毒无尘,避免了对人体健康的安全隐患。(Compared with the existing thermosensitive paper, the coated thermosensitive paper has higher slip property, scratch resistance, physicochemical corrosion resistance, weather resistance and durability, smaller thermal damage, no toxicity and no dust, and avoids the potential safety hazard to human health.)

The film-coated thermal paper comprises a paper base and a thermal-sensitive color developing agent layer coated on the surface of the paper base, and is characterized by further comprising a thin film layer, wherein a thermal-sensitive dye layer is coated on the side of the thin film layer, a lubricating layer is coated on the side of the thin film layer, and the thin film layer is compounded on the surface of the paper base through a film coating process in a mode that the thermal-sensitive dye layer faces the thermal-sensitive color developing agent layer.

2. The coated thermal paper according to claim 1, wherein the thermal-sensitive color developing agent layer is prepared from the following raw materials in parts by weight: 10-20% of binder, 35-55% of wax, 15-25% of color developing agent and the balance of filler.

3. The coated thermal paper according to claim 1, wherein the thermal dye layer is prepared from the following raw materials in parts by weight: 30-50% of binder, 35-45% of thermal sensitive dye, 3-8% of sensitizer and the balance filler.

4. The coated thermal paper according to claim 2, wherein the wax is or a mixture of two or more of carnauba wax, candelilla wax, rice bran wax, montan wax, polyethylene wax, saso wax, Fischer-Tropsch wax, paraffin wax and microcrystalline wax in any ratio.

5. The coated thermal paper according to claim 2 or 3, wherein the binder is or a mixture of two or more of acrylic resin, polyester resin, epoxy resin, EVA resin, SBS resin, rosin resin, SEBS resin, aldehyde ketone resin, petroleum resin, polyurethane resin and polystyrene resin in any proportion.

6. The coated thermal paper according to claim 4 or 5, wherein the thermal-sensitive color developing agent layer is prepared from the following raw materials in parts by weight: 10% of polyester resin, 5% of epoxy resin, 35% of paraffin, 35% of filler and 15% of color developing agent; or 8% of rosin resin, 5% of epoxy resin, 35% of rice bran wax, 32% of filler and 20% of color developing agent.

7. The coated thermal paper according to claim 5, wherein the thermal dye layer is prepared from the following raw materials in parts by weight: 20% of acrylic resin, 15% of EVA resin, 42% of thermal dye, 15% of filler and 8% of sensitizer; or 15% of aldehyde ketone resin, 15% of petroleum resin, 40% of thermosensitive dye, 22% of filler and 8% of sensitizer.

8. The coated thermal paper according to claim 1, wherein the film layer is a BOPET film.

9. The coated thermal paper according to claim 1, wherein the lubricating layer is a modified aqueous silicone resin coating.

10. The process for processing the film-coated thermal paper as claimed in any of claims 1 to 8, which comprises the following steps:

(1) slurry preparation

Lubricating layer slurry: dispersing the modified water-based organic silicon resin in water, wherein the modified water-based organic silicon resin comprises the following components in percentage by mass: water = 3: 7;

thermal dye layer slurry: dissolving a sensitizer and a binder in a mixed solvent of toluene and butanone according to a ratio, then adding a thermosensitive dye and a filler, and uniformly dispersing, wherein the mass ratio of toluene: butanone: the sum of the mass of the materials of the thermal dye layer is = 4: 3: 3;

slurry of thermosensitive color developing agent layer: taking wax according to a ratio, heating and melting, adding a binder, adding a filler and a color developing agent after the binder is completely dissolved, uniformly dispersing, and keeping the temperature at 90-110 ℃ for later use;

(2) coating a lubricating layer, namely coating the lubricating layer slurry on the surface of the film layer, drying at the temperature of 115-125 ℃, and controlling the coating amount to be 0.01-0.2 g/m²；

(3) Coating a thermal dye layer, namely coating the thermal dye layer slurry on another surfaces of the film layer dried in the step (2), and drying, wherein the thickness is controlled to be 0.8-1.2 mu m;

(4) coating a thermosensitive color developing agent layer, namely uniformly coating the thermosensitive color developing agent layer slurry on surfaces of the paper base at the temperature of 90-110 ℃, and drying, wherein the thickness is controlled to be 0.5-1.0 mu m;

(5) compounding, namely facing the surface of the paper base coated with the thermosensitive color developing agent layer to the surface of the film layer coated with the thermosensitive dye layer at the temperature of 55-65 ℃ and compounding to obtain the paper base.

Technical Field

The invention belongs to the technical field of thermal transfer printing and film coating, and particularly relates to kinds of film-coated thermal sensitive paper and a processing technology thereof.

Background

The heat sensitive recording mode has no smoke smell, no noise, high resolution, color copying, simple operation and other features, and the heat sensitive recording mode has no smoke smell, no noise, high resolution, etc. with the development of electronic computer terminal technology and printing equipment technology, the heat sensitive recording mode has replaced other traditional modes, such as electrocardiogram drawing, thermotechnical instrument recording paper, trademark, sign code, etc. is used widely in various fields, including market, supermarket, bank, hospital, ATM, etc. and has no consumption of carbon tape, box printing paper, etc. and has wide market share.

The thermosensitive printing paper is generally divided into three layers, the bottom layer is a paper base, the second layer is a thermosensitive coating, the third layer is a protective layer, the thermosensitive coating or the protective layer mainly influences the quality of the thermosensitive printing paper, if the thermosensitive coating of the thermosensitive printing paper is not uniform, the printing quality is obviously reduced, if the protective layer is not uniform, the protective effect of the thermosensitive coating can be greatly reduced, even fine particles of the protective layer can fall off in the printing process, and then the thermosensitive printing paper rubs a thermosensitive element of a printer, so that the printing thermosensitive element is damaged.

The covering film is fast and convenient ways to protect the printed matter, it permanently bonds the transparent plastic film with surface or two surfaces of the printed matter, makes the printed matter friction-resistant and waterproof, and is not damaged by the water vapor in the air and the erosion of the outside.

Disclosure of Invention

Compared with the existing thermal paper, the coated thermal paper has higher smoothness, scratch resistance, physicochemical corrosion resistance, weather resistance and durability, smaller thermal damage, no toxicity and dust, and avoids potential safety hazards to human health.

The invention adopts the following technical scheme:

kinds of film-coated thermal sensitive paper comprises a paper base, a thermal sensitive color developing agent layer coated on the surface of the paper base and a film layer, wherein a thermal sensitive dye layer is coated on the side of the film layer, a lubricating layer is coated on the side of the film layer, the film layer is compounded on the surface of the paper base through a film coating process in a mode that the thermal sensitive dye layer faces the thermal sensitive color developing agent layer, and the paper base is preferably coated paper.

Preferably, the thermosensitive color developing agent layer is prepared from the following raw materials in parts by weight: 10-20% of binder, 35-55% of wax, 15-25% of color developing agent and the balance of filler.

The thermosensitive color developing layer is used for providing a color developing agent of thermosensitive dye during printing and requires good infiltration performance during heating and printing, in the invention, the thermosensitive color developing layer needs to be compounded with the thin film layer to realize film covering on thermosensitive paper, and detection and discovery in the experimental process are as follows: if the dosage of the binder is less than 10%, the coating of the thermosensitive color developing agent layer and the film layer is not facilitated, and if the dosage is more than 20%, the adhesion of the thermosensitive color developing agent layer on the paper base is not facilitated, so that the dosage of the binder is selected to be 10-20%;

preferably, the thermosensitive dye layer is prepared from the following raw materials in parts by weight: 30-50% of binder, 35-45% of thermal sensitive dye, 3-8% of sensitizer and the balance of filler;

preferably, the wax is or a mixture of more than two of palm wax, candelilla wax, rice bran wax, montan wax, polyethylene wax, saso wax, Fischer-Tropsch wax, paraffin wax and microcrystalline wax in any proportion.

Preferably, the binder is or a mixture of more than two of acrylic resin, polyester resin, epoxy resin, EVA resin, SBS resin, rosin resin, SEBS resin, aldehyde ketone resin, petroleum resin, polyurethane resin and polystyrene resin in any proportion.

In the heat-sensitive color developing agent layer and the heat-sensitive dye layer, the filler is or a mixture of more than two of calcium carbonate, talcum powder, diatom ooze, titanium dioxide, kaolin and the like in any proportion;

in the heat-sensitive color developing agent layer, the color developing agent is bisphenol A, para-hydroxybenzoic acid and esters thereof (PHBP, PHB), salicylic acid, 2, 4-dihydroxybenzoic acid or aromatic sulfone and the like,

in the thermosensitive dye layer, the thermosensitive dye is phthalide, phenazine, spiropyran and fluorane compounds, and the sensitizer is benzene sulfonic acid amide compounds;

preferably, the thermosensitive color developing agent layer is prepared from the following raw materials in parts by weight: 10% of polyester resin, 5% of epoxy resin, 35% of paraffin, 35% of filler and 15% of color developing agent; or 8% of rosin resin, 5% of epoxy resin, 35% of rice bran wax, 32% of filler and 20% of color developing agent.

Preferably, the thermosensitive dye layer is prepared from the following raw materials in parts by weight: 20% of acrylic resin, 15% of EVA resin, 42% of thermal dye, 15% of filler and 8% of sensitizer; or 15% of aldehyde ketone resin, 15% of petroleum resin, 40% of thermosensitive dye, 22% of filler and 8% of sensitizer.

Preferably, the film layer is a BOPET film; the film layer is preferably a polyester film layer with the thickness of 1.0-2.0 microns, and is preferably a polyester film with the thickness of 1.5 microns, and the film layer mainly plays a role in protecting the thermosensitive paper from being damaged by folds, dyeing, sticking, scratches, oil stains, fingerprints and other physical or chemical damages brought by the outside; protecting the printing device from contamination or loss of the heat sensitive coating; protecting the printed content from water, alcohol and solvent, and maintaining high resolution, high scratch resistance and lasting weather resistance.

Preferably, the lubricating layer is a modified aqueous silicone resin coating.

The processing technology of the film-coated thermal sensitive paper comprises the following steps:

(1) slurry preparation

Lubricating layer slurry: dispersing the modified water-based organic silicon resin in water, wherein the modified water-based organic silicon resin comprises the following components in percentage by mass: water 3: 7;

thermal dye layer slurry: dissolving a sensitizer and a binder in a mixed solvent of toluene and butanone according to a ratio, then adding a thermosensitive dye and a filler, and uniformly dispersing, wherein the mass ratio of toluene: butanone: the sum of the mass of the materials of the thermosensitive dye layer is 4: 3: 3;

slurry of thermosensitive color developing agent layer: taking wax according to the proportion, heating and melting, adding the binder, adding the filler and the color developing agent after the binder is completely dissolved, uniformly dispersing, and keeping the temperature at 90-110 ℃ for later use;

(2) coating a lubricating layer, namely coating the lubricating layer slurry on surfaces of the film layer, drying at 120 ℃, and controlling the coating amount to be 0.01-0.2 g/m²Preferably 0.1g/m²；

(3) Coating a thermal dye layer, namely coating the thermal dye layer slurry on the other surfaces of the film layer dried in the step (2), and drying at the temperature of 57-63 ℃ until the thickness is controlled to be 0.8-1.2 mu m;

because the thermal dye layer is mainly used for printing, developing and identifying, the requirement on the thickness of the thermal dye layer is strict, and when the thickness of the thermal dye layer is less than 0.8 mu m, the coloring capability is low, so that the identification cannot be caused; when the thickness of the thermal sensitive dye layer is larger than 1.2 μm, poor penetration and combination of the thermal sensitive color developing agent layer and the thermal sensitive dye layer can be caused, and the printing effect and the film covering effect are influenced;

(4) coating a thermosensitive color developing agent layer, namely uniformly coating the slurry of the thermosensitive color developing agent layer on surfaces of the paper base at the temperature of 90-110 ℃, and drying at the temperature of 35-45 ℃ to control the thickness to be 0.5-1.0 mu m;

the thickness of the thermosensitive color developing agent layer is also required to be , when the thickness of the thermosensitive color developing agent layer is less than 0.5 mu m, the content of the thermosensitive color developing agent is lower, the effect of printing color development content is poorer, and the information recording effect cannot be achieved, and when the thickness of the thermosensitive color developing agent layer is more than 1.0 mu m, the bonding force between the thermosensitive color developing agent layer and the film layer is poor, so that the thermosensitive color developing agent layer is easy to peel off from the film layer automatically, the optimal thickness range of the thermosensitive color developing agent layer is 0.5-1.0 mu m, and good product quality and printing effect can be ensured;

(5) compounding, namely facing the surface of the paper base coated with the thermosensitive color developing agent layer to the surface of the film layer coated with the thermosensitive dye layer at the temperature of 55-65 ℃ and compounding to obtain the paper base.

The invention has the following beneficial effects:

the invention provides kinds of film-coated thermal paper, which is obtained by coating a specially treated film on the surface of a pretreated paper base, compared with general-purpose thermal paper, the film-coated thermal paper combines a gravure printing process and a film coating process, namely the paper base coated with a thermal-sensitive color developing agent layer is compounded with a BOPET film coated with a thermal-sensitive dye layer on a side and a lubricating layer on a side through the film coating process, and simultaneously utilizes the related performance of a thermal-sensitive material to avoid the performance fluctuation of the thermal-sensitive material caused by high temperature, the structure design and the service performance of the film-coated thermal paper are different from those of the general-purpose thermal paper, the structure design of the film-coated thermal paper is the paper base, the thermal-sensitive color developing agent layer, the thermal-sensitive dye layer, the film layer and the lubricating layer, and the general-purpose thermal-sensitive paper is the paper base, the thermal-sensitive layer and the top coating layer, the film-coated thermal-sensitive paper has higher smoothness, higher scratch resistance, physicochemical corrosion resistance, weather resistance and smaller thermal damage, and the invention combines the thermal-sensitive technology with the thermal-coated thermal-sensitive paper to avoid the direct contact of human body and has no harmful dye, and meets the requirements of protecting range of and the printing.

Detailed Description

In order to make the technical purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention are further described in with reference to specific embodiments.

Before introducing specific embodiments, the specific preparation process of the coated thermal paper provided by the invention is briefly introduced as follows, the coated thermal paper provided by the invention is mainly divided into five layers in structure, namely a paper base, a thermal color development agent layer, a thermal dye layer, a film layer and a lubricating layer, during preparation, the thermal color development agent layer is coated on the surface of the paper base in a screen roller printing mode, the lubricating layer is coated on the surface of the film, the thermal dye layer is coated on the other surface of the film, and the surface of the paper base coated with the thermal color development agent layer and the surface of the film coated with the thermal dye layer are coated and prepared by a film coating machine.

It should be noted that, for convenience of comparison and description of specific technical effects of the coated thermal paper provided by the present invention, in each of the following examples and comparative examples, the films used were kinds of 1.5 μm BOPET products produced by zhuoli film materials ltd, henna, the paper base used was 30 μm coated paper provided by jianghe paper industry ltd, henna, the fillers used were talc, the sensitizers used were 1-hydroxy-2-phenyl naphthoate (HNP), the thermal dyes used were fluorane thermal dyes, and the color developers used were bisphenol a

In the following examples, the compounding ratio is a mass ratio.

In the following examples, the raw materials and manufacturer information are as follows:

sensitizer: phenyl 1-hydroxy-2-naphthoate (HNP), available from Wuhan Haishan technologies, Inc.;

heat-sensitive dyes: fluoran thermal sensitive black CAS82137-81-3, available from Ningbo Jiangbei cloud culture products, Inc.;

color developing agent: bisphenol A, available from Panhua chemical (Shanghai) Co., Ltd

Filling: talcum powder BHS818 available from Asahon powder

Wax: montan wax, polyethylene wax (H102), and sudox wax, which are available from Shanghai Synechol chemical industry materials, Inc.;

paraffin, carnauba (BLK-B3 #), Fischer-Tropsch wax (B-70) were purchased from Shanghai Longsha trade and development, Inc.;

rice bran wax (BLK-M2 #), microcrystalline wax (BLK-W80 #) carnauba wax (BLK-X1 #), all available from Beijing Likang Wei science and technology Limited;

adhesive: EVA resin (18-3), polystyrene resin (PG-22), SBS resin (T161B) and SEBS resin, all from Xinhuamei plastics Co., Ltd;

the acrylic resin, the polyester resin, the polyurethane resin (PM-200) and the rosin resin (138) are all purchased from Hebei Shunjing chemical technology limited;

petroleum resins (C9), epoxy resins, and aldehyde ketone resins are available from Australian chemical Co., Ltd, Jinan;

modified water-based silicone resin: KM-3951, available from Kyoto chemical industries, Ltd.

The following briefly describes the specific preparation methods of the lubricating layer, the thermal dye layer and the thermal developer layer.

Preparation of the lubricating layer:

mixing the modified water-based silicone resin and water , stirring uniformly to obtain lubricating layer slurry (mass ratio, modified water-based silicone resin: water: 3: 7), coating the lubricating layer slurry on surface of the film by a gravure coater, drying at 120 ℃, and controlling the coating amount to be 0.1g/m²；

Preparing a thermosensitive dye layer:

dissolving a binder and a sensitizer in the thermal dye layer by using a mixed solvent of toluene and butanone, simultaneously heating to 65 ℃ for assisting in dissolving, cooling after complete dissolving, adding thermal dye and filler, and dispersing uniformly at a high speed to obtain thermal fuel layer slurry, wherein the mass ratio of toluene to butanone to solid materials (materials of the thermal dye layer) is 4: 3: 3, then coating the thermal dye layer slurry on the other surfaces of the dried film by using a gravure coater, and drying at 60 ℃ to control the thickness to be 0.8-1.2 mu m (see each embodiment for specific thickness).

Preparing a heat-sensitive color developing agent layer:

in the heat-sensitive color developing agent layer, wax is heated to be dissolved, the adhesive is directly put into the dissolved wax, after complete dissolution, the filler and the color developing agent are added, the mixture is uniformly dispersed at high speed to obtain heat-sensitive color developing agent layer slurry, the temperature is kept at 90-110 ℃ for standby, then a gravure coater is adopted, the slurry is uniformly coated on surfaces of the paper base at 90-110 ℃, drying is carried out at 40 ℃, and the thickness is controlled to be 0.5-1.0 mu m (see each embodiment for specific thickness).