CN113320307B - Light blue BOPET (biaxially oriented polyethylene terephthalate) film base for medical thermosensitive films - Google Patents
Light blue BOPET (biaxially oriented polyethylene terephthalate) film base for medical thermosensitive films Download PDFInfo
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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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/402—Coloured
- B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
Abstract
The invention relates to the field of medical thermosensitive films, in particular to a light blue BOPET film base for a medical thermosensitive film. The color of the colored PET film base obtained by blending the solid color mother particles and the PET base material is not uniform enough, and the light transmittance is required to be further improved. Based on the problems, the invention provides a light blue BOPET (biaxially oriented polyethylene terephthalate) film base for a medical thermosensitive film, which comprises a three-layer co-extrusion film, wherein the three-layer co-extrusion film is formed by compounding a polyester core layer and polyester surface layers on the outer sides of the upper surface and the lower surface of the polyester core layer. The invention adopts the polyester added with the light blue liquid colorant as the core layer to obtain the light blue BOPET film base of the medical thermosensitive film by utilizing the multilayer coextrusion and biaxial stretching processes, has better optical properties (low haze and high light transmittance) and heat resistance (low heat shrinkage rate) and can better meet the terminal requirements.
Description
Technical Field
The invention relates to the field of medical thermosensitive films, in particular to a light blue BOPET film base for a medical thermosensitive film.
Background
The medical thermosensitive film is suitable for thermosensitive printout of medical images which are stored in a digital mode after being processed by a computer, can truly reproduce various medical images processed by the computer, saves the developing and fixing processing procedure of the traditional silver salt product, and thoroughly eliminates the pollution of the processing waste liquid medicine to the environment.
The polyester film base is one of the important components of the medical thermosensitive film, and is widely applied to the preparation of the medical thermosensitive film in recent years due to the advantages of nonflammability, high melting point, good thermal stability, small hygroscopicity, low shrinkage rate, high mechanical strength, tensile strength, wear resistance, tearing resistance and the like. However, the type of products in China is not mature at present, the products mainly depend on foreign import, and the performance and the quality of the products are still different from those of imported products.
The traditional colored polyester film is made to have a certain color after solid color master batch is added in the film processing process. This method has some disadvantages such as insufficient uniformity of color, poor light transmittance, and high haze of the polyester film.
Disclosure of Invention
Aiming at the problems in the prior art, the technical problems to be solved by the invention are as follows: the color of the colored PET film base obtained by blending the solid color mother particles and the PET base material is not uniform enough, and the light transmittance is to be further improved.
The technical scheme adopted by the invention for solving the technical problem is as follows: the invention provides a light blue BOPET (biaxially oriented polyethylene terephthalate) film base for a medical thermosensitive film, which comprises a three-layer co-extruded film, wherein the three-layer co-extruded film is formed by compounding a polyester core layer and polyester surface layers on the outer sides of the upper surface and the lower surface of the polyester core layer, and the polyester core layer comprises the following components in parts by weight:
0.2 to 1 portion of light blue liquid colorant
99-99.8 parts of PET base material
The polyester surface layer comprises the following components in parts by weight:
15-25 parts of functional material
75-85 parts of PET base material.
Specifically, the light blue liquid colorant comprises the following components in parts by weight:
4-6 parts of surfactant
2-4 parts of tetrahydroxymethyl alkane
28-32 parts of modified toner pigment
60-64 parts of ethylene glycol.
Specifically, the surfactant is sodium dodecyl benzene sulfonate.
Specifically, the modified toner pigment is obtained by the following method:
uniformly mixing the toner pigment, deionized water and silicon dioxide powder according to a mass ratio of 1.
Specifically, the average particle diameter of the silica powder is 1 μm.
Specifically, the functional material is polyester film grade masterbatch FG611.
Specifically, the light blue BOPET film base for the medical thermosensitive film comprises the following steps:
(1) Uniformly mixing the functional material and the PET base material according to the formula amount, then placing the mixture into a drying tower for drying, controlling the temperature in the drying tower to be 150-170 ℃ and the drying time to be 4-5h, controlling the water content of the material to be 30-40ppm, and finally placing the mixed material into a double-screw extruder for melt blending to obtain a polyester surface layer material;
(2) According to the formula amount, adding a light blue colorant into a pre-mixer on the upper part of a single-screw extruder through a metering pump, uniformly mixing with a PET base material, and then entering a cavity of the extruder through a pre-mixed material outlet on the lower part of the pre-mixer for melt blending to obtain a polyester core layer material;
(3) Melting and co-extruding the polyester surface layer material and the polyester core layer material through a multi-layer co-extrusion process, and forming a composite PET thick sheet on a rotating cooling roller by using the melt;
(4) Preheating a composite PET thick sheet, longitudinally stretching by 3-4 times, and transversely stretching by 3-4 times;
(5) And (3) performing heat setting, cooling, traction rolling and slitting on the biaxially oriented film at 240-260 ℃ to obtain the light blue BOPET film base for the medical thermosensitive film.
The invention has the beneficial effects that:
(1) The invention adopts the polyester added with the light blue liquid colorant as the core layer to obtain the light blue BOPET film base of the medical thermosensitive film by utilizing the multi-layer co-extrusion and two-way stretching processes, has better optical property (low haze and high light transmittance) and heat resistance (low heat shrinkage rate), and can better meet the terminal requirement;
(2) Compared with the common solid color master batch type colorant, the light blue liquid colorant used in the invention has the advantages of smaller addition amount, more bright and uniform color and capability of effectively reducing the production cost.
Drawings
FIG. 1: is a device used in the preparation process of the light blue liquid colorant.
Detailed Description
The present invention will now be described in further detail with reference to examples.
The transparency test of the medical thermosensitive film base by the light blue BOPET film base adopts haze and light transmittance, and the measured conditions are executed according to GB/T2410-2008.
Example 1
a. Preparation of modified toner pigment:
uniformly mixing pigment blue 29 toner, deionized water and silicon dioxide powder according to the mass ratio of 1;
b. preparation of light blue liquid colorant:
firstly, dissolving 3 parts of tetramethylolmethane in 62 parts of ethylene glycol solvent, then dispersing 5 parts of sodium dodecyl benzene sulfonate in the solution, adding 30 parts of the modified toner pigment obtained in the step a, and then dispersing, grinding and filtering to obtain a light blue liquid colorant;
c. preparing a light blue BOPET (biaxially oriented polyethylene terephthalate) film base for the medical thermosensitive film:
(1) Uniformly mixing 15 parts of FG611 and 85 parts of FG600 base materials, then placing the mixture into a drying tower for drying, controlling the temperature in the drying tower at 160 ℃ and the drying time at 5 hours, controlling the water content of the material at 30ppm, and finally placing the mixed material into a double-screw extruder for melt blending to obtain a polyester surface layer material;
(2) Adding 0.2 part of light blue colorant into a pre-mixer at the upper part of a single-screw extruder through a metering pump, uniformly mixing with 99.8 parts of FG600 base material, and then entering a cavity of the extruder through a pre-mixed material outlet at the lower part of the pre-mixer for melt blending to obtain a polyester core layer material, wherein the device is shown in figure 1;
(3) Melting and co-extruding the polyester surface layer material and the polyester core layer material at 270 ℃ through a multi-layer co-extrusion process, and forming a composite PET thick sheet on a rotating cooling roller by using a melt, wherein the polyester core layer accounts for 92.6% of the composite PET thick sheet, and the polyester surface layer accounts for 7.4%;
(4) Preheating the composite PET thick sheet, longitudinally stretching by 3.5 times, and transversely stretching by 3.5 times;
(5) Heat setting, cooling, drawing, winding and cutting the biaxially oriented film at 260 ℃ to obtain a light blue BOPET film base for the medical thermosensitive film; the total thickness of the film base is 0.175mm, wherein the total thickness of the polyester surface layer is 0.013mm, and the thickness of the polyester core layer is 0.162mm; the film base has the light transmittance of 76 percent and the haze of 2.1 percent, and the transverse heat shrinkage rate and the longitudinal heat shrinkage rate of-0.02 percent and 0.65 percent after 15min at the temperature of 150 ℃.
Example 2
a. Preparation of modified toner pigment:
uniformly mixing pigment blue 29 toner, deionized water and silicon dioxide powder according to the mass ratio of 1;
b. preparation of light blue liquid colorant:
firstly, dissolving 2 parts of tetramethylolmethane in 64 parts of glycol solvent, then dispersing 6 parts of sodium dodecyl benzene sulfonate in the solution, adding 28 parts of the modified toner pigment obtained in the step a, and then dispersing, grinding and filtering to obtain a light blue liquid colorant;
c. preparing a light blue BOPET film base for the medical thermosensitive film:
(1) Uniformly mixing 20 parts of FG611 and 80 parts of FG600 base material, then placing the mixture into a drying tower for drying, controlling the temperature in the drying tower at 160 ℃ and the drying time at 4h, controlling the water content of the material at 35ppm, and finally placing the mixed material into a double-screw extruder for melt blending to obtain a polyester surface layer material;
(2) Adding 1 part of light blue colorant into a pre-mixer on the upper part of a single-screw extruder through a metering pump, uniformly mixing with 99 parts of FG600 base material, and then entering a cavity of the extruder through a pre-mixed material outlet on the lower part of the pre-mixer for melt blending to obtain a polyester core layer material;
(3) Melting and co-extruding the polyester surface layer material and the polyester core layer material at 270 ℃ through a multi-layer co-extrusion process, wherein a melt forms a composite PET thick sheet on a rotating cooling roller, the polyester core layer accounts for 91.7% of the composite PET thick sheet, and the polyester surface layer accounts for 8.3%;
(4) Preheating a composite PET thick sheet, longitudinally stretching by 3.2 times, and transversely stretching by 3.2 times;
(5) Heat setting, cooling, drawing, winding and cutting the film subjected to biaxial tension at 250 ℃ to obtain a light blue BOPET film base for the medical thermosensitive film; the total thickness of the film base is 0.180mm, the thickness of the polyester surface layer is 0.015mm, the thickness of the polyester core layer is 0.165mm, the light transmittance of the film base is 72%, the haze is 2.7%, the transverse heat shrinkage rate is-0.04% and the longitudinal heat shrinkage rate is 0.83% after 15min at 150 ℃.
Example 3
a. Preparation of modified toner pigment:
uniformly mixing pigment blue 29 toner, deionized water and silicon dioxide powder according to the mass ratio of 1;
b. preparation of light blue liquid colorant:
firstly, dissolving 4 parts of tetramethylolmethane in 60 parts of glycol solvent, then dispersing 4 parts of sodium dodecyl benzene sulfonate in the solution, adding 32 parts of the modified toner pigment obtained in the step a, and then dispersing, grinding and filtering to obtain a light blue liquid colorant;
c. preparing a light blue BOPET film base for the medical thermosensitive film:
(1) Uniformly mixing 25 parts of FG611 and 75 parts of FG600 base material, then placing the mixture into a drying tower for drying, controlling the temperature in the drying tower at 160 ℃ and the drying time at 4h, controlling the water content of the material at 40ppm, and finally placing the mixed material into a double-screw extruder for melt blending to obtain a polyester surface layer material;
(2) Adding 0.5 part of light blue colorant into a pre-mixer at the upper part of a single-screw extruder through a metering pump, uniformly mixing with 99.5 parts of FG600 base stock, and then entering a cavity of the extruder through a pre-mixed material outlet at the lower part of the pre-mixer for melt blending to obtain a polyester core layer material
(3) Melting and co-extruding the polyester surface layer material and the polyester core layer material at 270 ℃ through a multi-layer co-extrusion process, and forming a composite PET thick sheet on a rotating cooling roller by using a melt, wherein the polyester core layer accounts for 90% of the composite PET thick sheet, and the polyester surface layer accounts for 10%;
(4) Preheating a composite PET thick sheet, longitudinally stretching by 4 times, and transversely stretching by 4 times;
(5) Heat setting, cooling, drawing, winding and cutting the biaxially oriented film at 240 ℃ to obtain a light blue BOPET film base for the medical thermosensitive film; the total thickness of the film base is 0.190mm, the thickness of the polyester surface layer is 0.019mm, the thickness of the polyester core layer is 0.171mm, the light transmittance of the film base is 72%, the haze is 2.5%, the transverse heat shrinkage rate is-0.04% and the longitudinal heat shrinkage rate is 0.92% after 15min at 150 ℃.
Example 4
a. Preparation of modified toner pigment:
uniformly mixing pigment blue 29 toner, deionized water and silicon dioxide powder according to the mass ratio of 1;
b. preparation of light blue liquid colorant:
firstly, dissolving 3 parts of tetramethylolmethane in 62 parts of glycol solvent, then dispersing 5 parts of sodium dodecyl benzene sulfonate in the solution, adding 30 parts of the modified toner pigment obtained in the step a, and then dispersing, grinding and filtering to obtain a light blue liquid colorant;
c. preparing a light blue BOPET film base for the medical thermosensitive film:
(1) Uniformly mixing 20 parts of FG611 and 80 parts of FG600 base material, then placing the mixture into a drying tower for drying, controlling the temperature in the drying tower at 160 ℃ and the drying time at 5h, controlling the water content of the material at 30ppm, and finally placing the mixed material into a double-screw extruder for melt blending to obtain a polyester surface layer material;
(2) Adding 0.8 part of light blue colorant into a pre-mixer at the upper part of a single-screw extruder through a metering pump, uniformly mixing with 99.2 parts of FG600 base stock, and then entering a cavity of the extruder through a pre-mixed material outlet at the lower part of the pre-mixer for melt blending to obtain a polyester core layer material;
(3) Melting and co-extruding the polyester surface layer material and the polyester core layer material at 270 ℃ through a multi-layer co-extrusion process, and forming a composite PET thick sheet on a rotating cooling roller by using a melt, wherein the polyester core layer accounts for 92.1% of the composite PET thick sheet, and the polyester surface layer accounts for 7.9%;
(4) Preheating the composite PET thick sheet, longitudinally stretching by 3.25 times, and transversely stretching by 3.25 times;
(5) Heat setting, cooling, drawing, winding and cutting the film subjected to biaxial stretching at 250 ℃ to obtain a light blue BOPET film base for the medical thermosensitive film; the total thickness of the sheet base is 0.190mm, wherein the total thickness of the polyester surface layer is 0.015mm, and the thickness of the polyester core layer is 0.175mm; the film base has the light transmittance of 72 percent and the haze of 2.8 percent, and the transverse heat shrinkage rate and the longitudinal heat shrinkage rate of-0.03 percent and 0.78 percent after 15min at the temperature of 150 ℃.
Example 5
a. Preparation of modified toner pigment:
uniformly mixing pigment blue 29 toner, deionized water and silicon dioxide powder according to the mass ratio of 1;
b. preparation of light blue liquid colorant:
firstly, dissolving 4 parts of tetramethylolmethane in 62 parts of ethylene glycol solvent, then dispersing 4 parts of sodium dodecyl benzene sulfonate in the solution, adding 30 parts of the modified toner pigment obtained in the step a, and then dispersing, grinding and filtering to obtain a light blue liquid colorant;
c. preparing a light blue BOPET film base for the medical thermosensitive film:
(1) Uniformly mixing 25 parts of FG611 and 75 parts of FG600 base material, then placing the mixture into a drying tower for drying, controlling the temperature in the drying tower at 160 ℃ and the drying time at 6 hours, controlling the water content of the material at 30ppm, and finally placing the mixed material into a double-screw extruder for melt blending to obtain a polyester surface layer material;
(2) Adding 1 part of light blue colorant into a pre-mixer at the upper part of a single-screw extruder through a metering pump, uniformly mixing with 99 parts of FG600 base stock, and then entering a cavity of the extruder through a pre-mixed material outlet at the lower part of the pre-mixer for melt blending to obtain a polyester core layer material;
(3) Melting and co-extruding the polyester surface layer material and the polyester core layer material at 270 ℃ through a multi-layer co-extrusion process, and forming a composite PET thick sheet on a rotating cooling roller by using a melt, wherein the polyester core layer accounts for 88.9% of the composite PET thick sheet, and the polyester surface layer accounts for 11.1%;
(4) Preheating a composite PET thick sheet, longitudinally stretching by 3.2 times, and transversely stretching by 3.2 times;
(5) Heat setting, cooling, drawing, winding and cutting the film subjected to biaxial stretching at 250 ℃ to obtain a light blue BOPET film base for the medical thermosensitive film; the total thickness of the film base is 0.180mm, the thickness of the polyester surface layer is 0.020mm, the thickness of the polyester core layer is 0.160mm, the light transmittance of the film base is 72%, the haze is 2.6%, the transverse heat shrinkage rate is-0.04% after 15min at 150 ℃, and the longitudinal heat shrinkage rate is 0.83%.
Comparative example 1 the same as example 1 except that comparative example 1 uses polyoxyethylene sorbitan monostearate as the surfactant in the preparation of the light blue liquid colorant;
the total thickness of the polyester substrate obtained in comparative example 1 was 0.175mm, wherein the total thickness of the polyester face layer was 0.013mm and the thickness of the polyester core layer was 0.162mm, and the light transmittance of the polyester substrate obtained was 67%, the haze was 3.4%, the heat shrinkage in the transverse direction after 15min at 150 ℃ was 0.05% and the heat shrinkage in the longitudinal direction was 1.23%.
Comparative example 2 is the same as example 1 except that in comparative example 2, when the modified toner pigment is prepared, the mass ratio of the pigment blue 29 toner to deionized water and silica powder is 1;
the total thickness of the polyester substrate obtained in comparative example 2 was 0.175mm, wherein the total thickness of the polyester face layer was 0.013mm and the thickness of the polyester core layer was 0.162mm, and the light transmittance of the polyester substrate obtained was 65%, the haze was 3.4%, the heat shrinkage in the transverse direction after 15min at 150 ℃ was 0.07% and the heat shrinkage in the longitudinal direction was 1.4%.
Comparative example 3 the same as example 1 except that comparative example 3 used a polyester film grade masterbatch FG610 as the functional material for the top layer;
the total thickness of the polyester substrate obtained in comparative example 3 was 0.175mm, wherein the total thickness of the polyester face layer was 0.013mm and the thickness of the polyester core layer was 0.162mm, and the light transmittance of the polyester substrate obtained was 67%, the haze was 3.7%, the heat shrinkage in the transverse direction after 15min at 150 ℃ was-0.06% and the heat shrinkage in the longitudinal direction was 1.0%.
Comparative example 4 the same as example 1 except that the biaxially oriented film of comparative example 4 was heat-set at 230 ℃;
the total thickness of the polyester substrate obtained in comparative example 4 was 0.175mm, wherein the total thickness of the polyester face layer was 0.013mm and the thickness of the polyester core layer was 0.162mm, and the light transmittance of the polyester substrate obtained was 68%, the haze was 3.5%, the heat shrinkage in the transverse direction after 15min at 150 ℃ was 0.08%, and the heat shrinkage in the longitudinal direction was 1.7%.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. The utility model provides a medical heat-sensitive film is with light blue BOPET film base, includes three-layer coextruded film, three-layer coextruded film is by the polyester sandwich layer and the polyester surface course in the surface outside about the polyester sandwich layer is compound forms its characterized in that:
the polyester core layer comprises the following components in parts by weight:
0.2 to 1 portion of light blue liquid colorant
99-99.8 parts of PET base material
The polyester surface layer comprises the following components in parts by weight:
15-25 parts of functional material
75-85 parts of PET base stock;
the light blue liquid colorant comprises the following components in parts by weight:
4-6 parts of surfactant
2-4 parts of tetrahydroxymethyl alkane
28-32 parts of modified toner pigment
60-64 parts of ethylene glycol,
the modified toner pigment is obtained by the following method:
uniformly mixing a toner pigment, deionized water and silicon dioxide powder according to a mass ratio of 1;
the surfactant is sodium dodecyl benzene sulfonate.
2. The pale blue BOPET film base for medical thermo-chromatic films according to claim 1, characterized in that: the toner pigment is pigment blue 29.
3. The pale blue BOPET film base for medical thermo-chromatic films according to claim 1, characterized in that: the average particle size of the silica powder was 1 μm.
4. The pale blue BOPET film base for medical thermo-chromatic films according to claim 1, characterized in that: the functional material is polyester film grade master batch FG611.
5. The pale blue BOPET base for medical thermo-sensitive film according to any one of claims 1 to 4, wherein: the method comprises the following steps:
(1) Uniformly mixing the functional material and the PET base material according to the formula amount, then placing the mixture into a drying tower for drying, controlling the temperature in the drying tower to be 150-170 ℃ and the drying time to be 4-5h, controlling the water content of the material to be 30-40ppm, and finally placing the mixed material into a double-screw extruder for melt blending to obtain a polyester surface layer material;
(2) According to the formula amount, adding a light blue colorant into a pre-mixer on the upper part of a single-screw extruder through a metering pump, uniformly mixing with a PET base material, and then entering a cavity of the extruder through a pre-mixed material outlet on the lower part of the pre-mixer for melt blending to obtain a polyester core layer material;
(3) Melting and co-extruding the polyester surface layer material and the polyester core layer material at 270 ℃ through a multi-layer co-extrusion process, and forming a composite PET thick sheet on a rotating cooling roller by using the melt;
(4) Preheating the composite PET thick sheet, longitudinally stretching by 3-4 times, and transversely stretching by 3-4 times;
(5) And (3) performing heat setting, cooling, traction rolling and slitting on the biaxially oriented film at 240-260 ℃ to obtain the light blue BOPET film base for the medical thermosensitive film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110829144.8A CN113320307B (en) | 2021-07-22 | 2021-07-22 | Light blue BOPET (biaxially oriented polyethylene terephthalate) film base for medical thermosensitive films |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110829144.8A CN113320307B (en) | 2021-07-22 | 2021-07-22 | Light blue BOPET (biaxially oriented polyethylene terephthalate) film base for medical thermosensitive films |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113320307A CN113320307A (en) | 2021-08-31 |
| CN113320307B true CN113320307B (en) | 2023-01-24 |
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