CN113320307A - Light blue BOPET film base for medical thermosensitive film - Google Patents

Light blue BOPET film base for medical thermosensitive film Download PDF

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Publication number
CN113320307A
CN113320307A CN202110829144.8A CN202110829144A CN113320307A CN 113320307 A CN113320307 A CN 113320307A CN 202110829144 A CN202110829144 A CN 202110829144A CN 113320307 A CN113320307 A CN 113320307A
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China
Prior art keywords
film
polyester
parts
light blue
medical
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Chinese (zh)
Inventor
吕建峰
夏毅
李超
蒙钊
李卓超
梁雪芬
孙萌
胡婧
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JIANGSU YUXING FILM TECHNOLOGY CO LTD
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JIANGSU YUXING FILM TECHNOLOGY CO LTD
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Priority to CN202110829144.8A priority Critical patent/CN113320307A/en
Publication of CN113320307A publication Critical patent/CN113320307A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40Thermography ; 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
    • B41M5/42Intermediate, backcoat, or covering layers
    • B41M5/44Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered 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
    • B32B27/08Layered 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/36Layered products comprising a layer of synthetic resin comprising polyesters
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/30Properties of the layers or laminate having particular thermal properties
    • B32B2307/306Resistant to heat
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/402Coloured
    • B32B2307/4026Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/412Transparent
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/04Oxygen-containing compounds
    • C08K5/05Alcohols; Metal alcoholates
    • C08K5/053Polyhydroxylic alcohols
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00Use of pretreated ingredients
    • C08K9/02Ingredients 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 to be further improved. Based on the problems, the invention provides a light blue BOPET 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

Light blue BOPET film base for medical thermosensitive film
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 products of the type are not mature at home at present, the products mainly depend on foreign import, and the performance and the quality of the products still have little difference with the 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 problems is as follows: the invention provides a light blue BOPET 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 tetramethylolmethane
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 the mass ratio of 1:1:2, placing the mixture into a high-shear homogeneous dispersion emulsifying machine, shearing and emulsifying the mixture for 6 to 9 hours at the temperature of between 80 and 90 ℃ and under the condition that the pH is =6 to 7, and filtering, drying and grinding the mixture to obtain the modified toner pigment.
Specifically, the average particle diameter of the silica powder is 1 μm.
Specifically, the functional material is polyester film grade masterbatch FG 611.
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 at 170 ℃ and the drying time at 4-5h, controlling the water content of the material at 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 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 the temperature of 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 1:1:2, then placing the mixture into a high-shear homogeneous dispersion emulsifying machine, shearing and emulsifying the mixture for 8 hours at the temperature of 90 ℃ and under the condition that the pH is =7, and filtering, drying and grinding the mixture to obtain the modified toner pigment;
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 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 substrate is 0.175mm, wherein the total thickness of the polyester surface layer is 0.013mm, and the thickness of the polyester core layer is 0.162 mm; 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 1:1:2, then placing the mixture into a high-shear homogeneous dispersion emulsifying machine, shearing and emulsifying the mixture for 6 hours at the temperature of 80 ℃ and under the condition that the pH is =6, and filtering, drying and grinding the mixture to obtain the modified toner pigment;
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 the 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 0.015mm, 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 1:1:2, then placing the mixture into a high-shear homogeneous dispersion emulsifying machine, shearing and emulsifying the mixture for 9 hours at the temperature of 90 ℃ and under the condition that the pH is =7, and filtering, drying and grinding the mixture to obtain the modified toner pigment;
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 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
(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% and the polyester surface layer accounts for 10% in the composite PET thick sheet;
(4) preheating the 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 1:1:2, then placing the mixture into a high-shear homogeneous dispersion emulsifying machine, shearing and emulsifying the mixture for 6 hours at the temperature of 85 ℃ and under the condition that the pH is =9, and filtering, drying and grinding the mixture to obtain the modified toner pigment;
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 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 on 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 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 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 0.175 mm; 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 1:1:2, then placing the mixture into a high-shear homogeneous dispersion emulsifying machine, shearing and emulsifying the mixture for 9 hours at the temperature of 80 ℃ and under the condition that the pH is =6.5, and filtering, drying and grinding the mixture to obtain the modified toner pigment;
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 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, 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 the 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 used a surfactant of polyoxyethylene sorbitan monostearate during 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 layers was 0.013mm and the thickness of the polyester core layer was 0.162mm, and the obtained polyester substrate had a light transmittance of 67%, a haze of 3.4%, a transverse heat shrinkage of 0.05% and a longitudinal heat shrinkage of 1.23% after 15min at 150 ℃.
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 the deionized water and the silica powder is 1:2: 1;
the total thickness of the polyester substrate obtained in comparative example 2 was 0.175mm, wherein the total thickness of the polyester face layers 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 uses 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 layers 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 layers was 0.013mm and the thickness of the polyester core layer was 0.162mm, and the obtained polyester substrate had a light transmittance of 68%, a haze of 3.5%, a transverse heat shrinkage of 0.08% and a longitudinal heat shrinkage of 1.7% after 15min at 150 ℃.
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 (8)

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 material.
2. The pale blue BOPET film base for medical thermo-chromatic films according to claim 1, characterized in that: the light blue liquid colorant comprises the following components in parts by weight:
4-6 parts of surfactant
2-4 parts of tetramethylolmethane
28-32 parts of modified toner pigment
60-64 parts of ethylene glycol.
3. The pale blue BOPET film base for medical thermo-chromatic films according to claim 2, wherein: the surfactant is sodium dodecyl benzene sulfonate.
4. The pale blue BOPET film base for medical thermo-chromatic films according to claim 2, wherein: the modified toner pigment is obtained according to the following method:
uniformly mixing the toner pigment, deionized water and silicon dioxide powder according to the mass ratio of 1:1:2, placing the mixture into a high-shear homogeneous dispersion emulsifying machine, shearing and emulsifying the mixture for 6 to 9 hours at the temperature of between 80 and 90 ℃ and under the condition that the pH is =6 to 7, and filtering, drying and grinding the mixture to obtain the modified toner pigment.
5. The pale blue BOPET film base for medical thermo-chromatic films according to claim 4, wherein: the toner pigment is pigment blue 29.
6. The pale blue BOPET film base for medical thermo-chromatic films according to claim 4, wherein: the average particle size of the silica powder is 1 μm.
7. 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 FG 611.
8. The pale blue BOPET base for medical thermo-sensitive film according to any one of claims 1 to 7, 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 at 170 ℃ and the drying time at 4-5h, controlling the water content of the material at 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 the temperature of 240-260 ℃ to obtain the light blue BOPET film base for the medical thermosensitive film.
CN202110829144.8A 2021-07-22 2021-07-22 Light blue BOPET film base for medical thermosensitive film Pending CN113320307A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240899A (en) * 1992-08-19 1993-08-31 Eastman Kodak Company Slipping layer binder for dye-donor element used in thermal dye transfer
CN102702701A (en) * 2012-05-25 2012-10-03 东莞市德诚塑化科技有限公司 Liquid coloring master batch for polyester product
CN204340418U (en) * 2014-10-14 2015-05-20 湖南省三创科技有限公司 A kind of blue high tenacity medical film
CN105802114A (en) * 2016-03-28 2016-07-27 李伟雄 Plastic liquid coloring agent and preparation technology thereof
CN110116538A (en) * 2019-06-03 2019-08-13 杭州和顺科技股份有限公司 A kind of antibacterial on-slip biaxially oriented polyester film and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240899A (en) * 1992-08-19 1993-08-31 Eastman Kodak Company Slipping layer binder for dye-donor element used in thermal dye transfer
CN102702701A (en) * 2012-05-25 2012-10-03 东莞市德诚塑化科技有限公司 Liquid coloring master batch for polyester product
CN204340418U (en) * 2014-10-14 2015-05-20 湖南省三创科技有限公司 A kind of blue high tenacity medical film
CN105802114A (en) * 2016-03-28 2016-07-27 李伟雄 Plastic liquid coloring agent and preparation technology thereof
CN110116538A (en) * 2019-06-03 2019-08-13 杭州和顺科技股份有限公司 A kind of antibacterial on-slip biaxially oriented polyester film and preparation method thereof

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