CN111497485A - Laser printing medical film and preparation method thereof - Google Patents
Laser printing medical film and preparation method thereof Download PDFInfo
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- CN111497485A CN111497485A CN202010299720.8A CN202010299720A CN111497485A CN 111497485 A CN111497485 A CN 111497485A CN 202010299720 A CN202010299720 A CN 202010299720A CN 111497485 A CN111497485 A CN 111497485A
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- liquid
- fluorescent whitening
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- coating liquid
- layer coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
- B41M5/504—Backcoats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B41M5/5281—Polyurethanes or polyureas
Abstract
The invention discloses a laser printing medical film and a preparation method thereof, wherein the film comprises the following components in percentage by weight: 75% -92% of mixed solution of polyvinyl alcohol and polyurethane; 2% -5% of isopropanol; 0.3 to 0.5 percent of microspherical PMMA; 0.1 to 0.5 percent of sodium dodecyl sulfate; 0.05 to 0.20 percent of gelatin; the balance of water; the microspherical PMMA is of a hollow structure and has the particle size of 4-6 mu m. The antistatic fluorescent whitening back layer coating liquid comprises the following components: 70-90% of mixed solution of polyvinyl alcohol and polyurethane; 10% -30% of polythiophene liquid; 0.1 to 1.0 percent of fluorescent whitening agent; 8% -20% of isopropanol; the sum of the contents of all the components is 100 percent. The toner receiving layer coating liquid does not contain inorganic particles, and the laser printing film recording medium prepared by the toner receiving layer coating liquid has the advantages of good transparency, high contrast, good glossiness, high resolution and low manufacturing cost.
Description
Technical Field
The invention relates to the technical field of laser printing, in particular to a laser printing medical film and a preparation method thereof.
Background
The characteristics required for a recording film medium for laser recording include: (1) the ink composition has quick drying properties (high absorption rate of toner), (2) appropriate and uniform dot diameter, (3) good graininess, (4) high circularity of dots, (5) high color density, (6) high chroma (no color and gray darkness), (7) good light resistance and gas resistance of printed parts, (8) high whiteness of recording film material, (9) good storage stability of film material (no yellowing and no bleeding of image during long-term storage), (10) hard deformation, good dimensional stability (little curling), and (11) good hardware running properties. Further, in order to obtain a film high-quality recorded matter, the laser print film used is required to have, in addition to the above-described characteristics, glossiness, surface smoothness, and the like.
As a film medium for laser printing recording that satisfies the above requirements, there are known a laser printing medium in which a color material receiving layer is formed by applying a solution containing inorganic fine particles, a water-soluble resin such as a mordant or PVA and a curing agent for the water-soluble resin on a support (see, for example, patent document 1 below), and a laser printing recording paper-like medium in which a solution containing inorganic fine particles, a metal compound or a water-soluble resin such as PVA is applied on a support and the solution containing a water-soluble resin curing agent is applied to the coating layer before the coating layer is completely dried, thereby forming a color material receiving layer.
Conventionally, a coloring material-receiving layer has been obtained by applying a coating liquid containing fumed silica, a cationic polymer containing a polydiallylamine derivative structural unit (a dimethyldiallylammonium chloride polymer), PVA, and boric acid and drying the coating liquid, but the image of the laser printing film medium has poor print density and gloss, low contrast, and relatively low bulk density.
Alternatively, the coloring material receiving layer may be obtained by applying a coating liquid containing inorganic fine particles (for example, fumed silica having an average primary particle diameter of 20nm or less), a water-soluble resin (for example, PVA), and a water-soluble metal salt having a valence of 2 or more to a support, and curing the coating liquid by applying a solution containing a crosslinking agent (for example, borax or boric acid) capable of crosslinking the water-soluble resin simultaneously with the application or before the applied layer exhibits a reduced drying rate.
Also known are inorganic mordants such as polyvalent metal salts. The inorganic mordant forms a toner-receiving layer, and although the toner-receiving layer does not crack, sufficient gloss and print density cannot be obtained, and the stability of the coating liquid is not improved.
The transparency and gloss are affected by the presence of inorganic particles. Since the particle is not transparent, the light transmittance is affected under the condition of the film viewing light box device, namely the low density is directly affected, and finally the contrast is low. And because the shape of the inorganic grains is irregular, the friction factor mu max of the surface of the film is increased, so that the film is stuck during printing. In addition, the use of PVA alone as a dispersant does not satisfy many properties, especially concerning uniformity of print density, large density, fastness of coating, and the like, of which the most important phenomenon is that the absorption density cannot be always greatly increased, and also directly affects improvement of contrast.
Therefore, it is a technical problem to be solved urgently in the technical field to provide a laser printing film which does not contain inorganic particles, has good transparency, good adsorption to toner dyes, improved contrast and large density, uniform printing density and good fastness, and has a proper and low surface friction factor.
Disclosure of Invention
In view of the above, the present invention aims to provide a laser printing medical film which does not contain inorganic particles, has good transparency, good adsorbability to toner dyes, improved contrast and large density, uniform printing density, good fastness and suitable and low surface friction factor, and a preparation method thereof.
The adopted technical scheme is as follows:
a laser printing medical film comprises a base material, a toner receiving layer coated on the front surface of the base material and an anti-static fluorescent whitening back layer coated on the back surface of the base material; the toner receiving layer is formed by coating a toner receiving layer coating liquid on a base material and curing; the anti-static fluorescent whitening back layer is formed by coating an anti-static fluorescent whitening back layer coating liquid on a base material and curing;
the toner receiving layer coating liquid comprises the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 75% -92%;
isopropyl alcohol: 2% -5%;
microspheroidal polymethylmethacrylate: 0.3% -0.5%;
sodium dodecyl sulfate: 0.1% -0.5%;
gelatin: 0.05% -0.20%;
the balance of water;
the antistatic fluorescent whitening back layer coating liquid consists of the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 70% -90%;
polythiophene liquid: 10% -30%;
fluorescent whitening agent: 0.1% -1.0%;
isopropyl alcohol: 8% -20%;
the sum of the contents of all the components is 100 percent.
Further, the base material is a PET sheet base.
Further, the fluorescent whitening agent is a fluorescent whitening agent OD.
In the preparation method of the laser printing medical film, the toner receiving layer coating liquid is prepared by the following steps:
s11, preparing a gelatin aqueous solution with the concentration of 1 wt% according to the formula proportion, and stirring in a water bath at 40 ℃;
s12, cooling to room temperature, adding microspherical polymethyl methacrylate into the gelatin aqueous solution with the concentration of 1 wt% prepared in the step (1) according to the formula proportion, then adding sodium dodecyl sulfate, uniformly stirring to form liquid A, and standing for later use;
s13, adding a mixed solution of polyvinyl alcohol and polyurethane with the solid content of 35 wt% into another container according to the formula proportion; and adding isopropanol to form liquid B;
s14, adding the liquid A into the liquid B according to the formula proportion, and uniformly stirring; it can be coated on the substrate.
Further, the preparation steps of the antistatic fluorescent whitening back layer coating liquid are as follows:
s21, preparing an isopropanol solution of a fluorescent whitening agent with the concentration of 1 wt% according to the formula proportion, and stirring to prepare a liquid C;
s22, adding a mixed solution of polyvinyl alcohol and polyurethane with solid content of 35 wt% and a polythiophene solution into another container according to the formula proportion to form a liquid D;
s23, adding the liquid C into the liquid D according to the formula proportion, and uniformly stirring; it can be coated on the substrate.
The invention has the beneficial effects that:
the toner receiving layer of the invention uses macromolecule PMMA microsphere (i.e. microspherical polymethyl methacrylate) particles to replace inorganic particles, the microsphere particles are of a hollow structure, the particle size is 4-6 μm, the transparency of the film is good, the suspension characteristic of the macromolecule microsphere particles can also reduce the surface friction factor of the film to an optimum value: 0.10-0.25, and the phenomenon of printer card is avoided.
And a mixed system of gelatin is added, so that the large density, the uniformity and the coating printing fastness of the laser printing material are integrally improved.
The toner accepts the layer and combines with the anti-static fluorescence whitening backing layer, has formed that the dyestuff adsorptivity is good, the fixation is good, and the laser printing film that powdered ink dyestuff optical density utilization ratio is high, and the contrast can reach 300: 1 or more.
In conclusion, the coating liquid of the pigment receiving layer of the laser printing material does not contain inorganic particles, and the laser printing film recording medium prepared by the coating liquid has good transparency, high contrast, good glossiness, high resolution and low manufacturing cost.
Detailed Description
Terms used in the present invention have generally meanings as commonly understood by one of ordinary skill in the art, unless otherwise specified. The present invention will be described in further detail with reference to specific examples. It is to be understood that these examples are for illustrative purposes only and are not to be construed as limiting the scope of the invention, which is defined by the appended claims.
In the following examples, various procedures and methods not described in detail are conventional methods well known in the art. The origin, trade name and composition of the materials used are indicated at the first appearance, and the same materials used thereafter are the same as indicated at the first appearance unless otherwise specified.
Example 1
A laser printing medical film comprises a base material, a toner receiving layer coated on the front surface of the base material and an anti-static fluorescent whitening back layer coated on the back surface of the base material; the toner receiving layer is formed by coating the toner receiving layer coating liquid on a base material and curing; the antistatic fluorescent whitening back layer is formed by coating antistatic fluorescent whitening back layer coating liquid on a base material and curing.
The toner receiving layer coating liquid comprises the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 75 percent;
isopropyl alcohol: 2 percent;
microspheroidal polymethylmethacrylate: 0.3 percent;
sodium dodecyl sulfate: 0.1 percent;
gelatin: 0.05 percent;
the balance being water.
The antistatic fluorescent whitening back layer coating liquid consists of the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 70 percent;
polythiophene liquid: 10 percent;
fluorescent whitening agent: 0.3 percent;
isopropyl alcohol: 19.3 percent.
The base material is a PET sheet base. The fluorescent whitening agent is a fluorescent whitening agent OD. The gelatin is photographic grade alkaline gelatin. I.e. gelatin prepared by an alkaline process.
In the preparation method of the laser printing medical film, the preparation steps of the toner receiving layer coating liquid are as follows:
s11, preparing a gelatin aqueous solution with the concentration of 1 wt% according to the formula proportion, and stirring in a water bath at 40 ℃;
s12, cooling to room temperature, adding microspherical polymethyl methacrylate into the gelatin aqueous solution with the concentration of 1 wt% prepared in the step (1) according to the formula proportion, then adding sodium dodecyl sulfate, uniformly stirring to form liquid A, and standing for later use;
s13, adding a mixed solution of polyvinyl alcohol and polyurethane with the solid content of 35 wt% into another container according to the formula proportion; and adding isopropanol to form liquid B;
s14, adding the liquid A into the liquid B according to the formula proportion, and uniformly stirring; it can be coated on the substrate.
The preparation steps of the antistatic fluorescent whitening back layer coating liquid are as follows:
s21, preparing an isopropanol solution of a fluorescent whitening agent with the concentration of 1 wt% according to the formula proportion, and stirring to prepare a liquid C;
s22, adding a mixed solution of polyvinyl alcohol and polyurethane with solid content of 35 wt% and a polythiophene solution into another container according to the formula proportion to form a liquid D;
s23, adding the liquid C into the liquid D according to the formula proportion, and uniformly stirring; it can be coated on the substrate. .
Example 2
Referring to example 1, unlike example 1, a laser-printed medical film of this example,
the toner receiving layer coating liquid comprises the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 80 percent;
isopropyl alcohol: 3 percent;
microspheroidal polymethylmethacrylate: 0.4 percent;
sodium dodecyl sulfate: 0.3 percent;
gelatin: 0.1 percent;
the balance being water.
The antistatic fluorescent whitening back layer coating liquid consists of the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 80 percent;
polythiophene liquid: 10 percent;
fluorescent whitening agent: 0.5 percent;
isopropyl alcohol: 9.5 percent.
Example 3
Referring to example 1, unlike example 1, a laser-printed medical film of this example,
the toner receiving layer coating liquid comprises the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 87 percent;
isopropyl alcohol: 3 percent;
microspheroidal polymethylmethacrylate: 0.5 percent;
sodium dodecyl sulfate: 0.5 percent;
gelatin: 0.20 percent;
the balance being water.
The antistatic fluorescent whitening back layer coating liquid consists of the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 70 percent;
polythiophene liquid: 20 percent;
fluorescent whitening agent: 1.0 percent;
isopropyl alcohol: 9 percent.
And (3) product performance determination:
the samples prepared in examples 1 to 3 were subjected to performance tests using conventional testing methods in the art, and the test results were as follows:
1. contrast ratio: not less than 300: 1;
2. transparency: more than or equal to 80 percent;
3. gloss: 60 to 90 percent of
4. The resolving power is more than or equal to 80L/mm;
5. color reduction degree (spectrophotometry):
400nm—500nm：50％；
500nm—600nm：50％；
600nm—700nm：50％；
6. maximum optical density: 0D is more than or equal to 2.4;
7. uniformity: the mean square error sigma of optical density sampling is less than or equal to 0.3; (sampling Rate: 100/0.01, sample appearance passed)
8. And (3) printing fastness of the coating: the peel strength B is more than or equal to 5 KPa.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (4)
1. The laser printing medical film is characterized by comprising a base material, a toner receiving layer coated on the front surface of the base material and an anti-static fluorescent whitening back layer coated on the back surface of the base material; the toner receiving layer is formed by coating a toner receiving layer coating liquid on a base material and curing; the anti-static fluorescent whitening back layer is formed by coating an anti-static fluorescent whitening back layer coating liquid on a base material and curing;
the toner receiving layer coating liquid comprises the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 75% -92%;
isopropyl alcohol: 2% -5%;
microspheroidal polymethylmethacrylate: 0.3% -0.5%;
sodium dodecyl sulfate: 0.1% -0.5%;
gelatin: 0.05% -0.20%;
the balance of water;
the microspherical polymethyl methacrylate is a hollow structure, and the particle size is 4-6 mu m;
the antistatic fluorescent whitening back layer coating liquid consists of the following components in percentage by weight:
polyvinyl alcohol and polyurethane mixed solution: 70% -90%;
polythiophene liquid: 10% -30%;
fluorescent whitening agent: 0.1% -1.0%;
isopropyl alcohol: 8% -20%;
the sum of the contents of all the components is 100 percent.
2. The laser-printed medical film according to claim 1, wherein the substrate is a PET film substrate.
3. The laser-printed medical film according to claim 1, wherein the optical brightener is an optical brightener OD.
4. The method for preparing a laser-printed medical film according to claim 1, comprising:
the first step of disposing the toner receiving layer coating liquid is as follows:
s11, preparing a gelatin aqueous solution with the concentration of 1 wt% according to the formula proportion, and stirring in a water bath at 40 ℃;
s12, cooling to room temperature, adding microspherical polymethyl methacrylate into the gelatin aqueous solution with the concentration of 1 wt% prepared in the step (1) according to the formula proportion, then adding sodium dodecyl sulfate, uniformly stirring to form liquid A, and standing for later use;
s13, adding a mixed solution of polyvinyl alcohol and polyurethane with the solid content of 35 wt% into another container according to the formula proportion; and adding isopropanol to form liquid B;
s14, adding the liquid A into the liquid B according to the formula proportion, and uniformly stirring; can be coated on the front surface of the base material;
secondly, the preparation steps of the antistatic fluorescent whitening back layer coating liquid are as follows:
s21, preparing an isopropanol solution of a fluorescent whitening agent with the concentration of 1 wt% according to the formula proportion, and stirring to prepare a liquid C;
s22, adding a mixed solution of polyvinyl alcohol and polyurethane with solid content of 35 wt% and a polythiophene solution into another container according to the formula proportion to form a liquid D;
s23, adding the liquid C into the liquid D according to the formula proportion, and uniformly stirring; it can be coated on the reverse side of the substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010299720.8A CN111497485A (en) | 2020-04-16 | 2020-04-16 | Laser printing medical film and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010299720.8A CN111497485A (en) | 2020-04-16 | 2020-04-16 | Laser printing medical film and preparation method thereof |
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| US20040059038A1 (en) * | 1999-04-01 | 2004-03-25 | Foto-Wear, Inc. | Polymeric composition and printer/copier transfer sheet containing the composition |
| CN103625143A (en) * | 2013-12-02 | 2014-03-12 | 江苏耐斯数码科技股份有限公司 | Medical laser printing film |
| CN103640353A (en) * | 2013-12-02 | 2014-03-19 | 江苏耐斯数码科技股份有限公司 | Antistatic layer for medical film and preparation method |
| CN104449112A (en) * | 2014-12-12 | 2015-03-25 | 上海森彩数码喷绘材料有限公司 | Coating adhesive for medical laser printing film and printing medium |
| CN105216472A (en) * | 2015-10-30 | 2016-01-06 | 合肥乐凯科技产业有限公司 | A kind of dry type medical film polyester film base |
| CN105365427A (en) * | 2015-12-25 | 2016-03-02 | 天津美迪亚影像材料有限公司 | Environment-friendly and medical laser printing film |
| CN106379069A (en) * | 2016-08-29 | 2017-02-08 | 合肥菲力姆数码科技有限公司 | Medical laser printing film |
| CN108641507A (en) * | 2018-04-05 | 2018-10-12 | 王利新 | Quick-dry type ink-jet printing material colorant receiving layer coating fluid |
| CN110000071A (en) * | 2019-04-10 | 2019-07-12 | 天津市康华健晔医用材料有限公司 | A kind of production technology of X-ray film |
-
2020
- 2020-04-16 CN CN202010299720.8A patent/CN111497485A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040059038A1 (en) * | 1999-04-01 | 2004-03-25 | Foto-Wear, Inc. | Polymeric composition and printer/copier transfer sheet containing the composition |
| CN103625143A (en) * | 2013-12-02 | 2014-03-12 | 江苏耐斯数码科技股份有限公司 | Medical laser printing film |
| CN103640353A (en) * | 2013-12-02 | 2014-03-19 | 江苏耐斯数码科技股份有限公司 | Antistatic layer for medical film and preparation method |
| CN104449112A (en) * | 2014-12-12 | 2015-03-25 | 上海森彩数码喷绘材料有限公司 | Coating adhesive for medical laser printing film and printing medium |
| CN105216472A (en) * | 2015-10-30 | 2016-01-06 | 合肥乐凯科技产业有限公司 | A kind of dry type medical film polyester film base |
| CN105365427A (en) * | 2015-12-25 | 2016-03-02 | 天津美迪亚影像材料有限公司 | Environment-friendly and medical laser printing film |
| CN106379069A (en) * | 2016-08-29 | 2017-02-08 | 合肥菲力姆数码科技有限公司 | Medical laser printing film |
| CN108641507A (en) * | 2018-04-05 | 2018-10-12 | 王利新 | Quick-dry type ink-jet printing material colorant receiving layer coating fluid |
| CN110000071A (en) * | 2019-04-10 | 2019-07-12 | 天津市康华健晔医用材料有限公司 | A kind of production technology of X-ray film |
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