CN108148473B - Water-based bottom layer composition, polyester film and industrial radiographic inspection film - Google Patents
Water-based bottom layer composition, polyester film and industrial radiographic inspection film Download PDFInfo
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
- G03C1/795—Photosensitive materials characterised by the base or auxiliary layers the base being of macromolecular substances
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/04—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C09D127/08—Homopolymers or copolymers of vinylidene chloride
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- 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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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2427/08—Homopolymers or copolymers of vinylidene chloride
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Abstract
The invention relates to a water-based bottom layer composition, a polyester film and an industrial radiographic inspection film, wherein the water-based bottom layer composition comprises the following components in parts by weight: tetrapolymer water latex: 20-60 parts of gelatin: 5-20 parts of swelling agent: 1-5 parts of an anti-blocking agent: 0.1-3 parts, deionized water: 100-500 parts; the swelling agent is catechol, hydroquinone, pyrogallol, 4-chlorocatechol, 4-chlororesorcinol or 3-chlorocatechol in phenolic compounds. The aqueous bottom layer composition provided by the invention is beneficial to continuous production, improves the bonding fastness between the base material and the bottom layer and between the bottom layer and the functional layer, improves the flatness of the film due to the reduction of the drying temperature, reduces the influence on the environment, and can meet the use requirements of industrial radiographic testing films and medical digital dry films.
Description
Technical Field
The invention relates to a water-based coating composition, and a polyester film and a film prepared from the same.
Background
The polyester film has excellent physical property and chemical stability, and is widely used in advertising media, electrical insulation, electronic product production process protection, displays and other industries. In particular, it has excellent dimensional stability and excellent stiffness, and is widely used in the field of image information materials. However, due to the chemical inertness of the polyester film, the surface of the polyester film is difficult to be corroded by common chemical solvents, so that the subsequent functional coating is difficult to be well adhered.
After the surface of the base material is subjected to various pretreatments, the adhesion of the precoating primer layer can be further improved. The main method comprises the following steps: physical treatments such as corona treatment, plasma treatment, and the like; chemical treatment such as oxidation treatment with permanganate or peroxide and swelling treatment with a swelling agent such as phenol, chloral hydrate and chloroacetic acid are generally performed using a phenol-based swelling agent in consideration of safety and environmental friendliness. Usually, a chemical treatment and a physical treatment are used together.
In practice, the most used is a bilayer system that increases hydrophilicity by first applying a resin primer layer and then applying a hydrophilic layer. This method can improve the adhesion strength of the subsequent functional coating layer to the resin support, but leads to deterioration in the apparent quality of the final product due to the complicated coating flow of the two-layer system.
In order to improve the stability of the production process, an on-line coating process is adopted, namely, the base film is subjected to transverse stretching corona treatment, and then is coated and dried. Since the drying process is carried out under a relaxed condition, the drying temperature is limited by the glass transition temperature of the resin support, and the resin support is liable to be unevenly shrunk and deformed due to too high drying temperature, thereby causing the poor apparent flatness of the final product; if the drying temperature is low, it is difficult for the swelling agent to achieve a swelling effect on the resin support, and the adhesion fastness of the primer layer to the resin support is affected. According to the related patents and technical documents, resorcinol is the most swelling agent. In order to achieve a good swelling adhesion effect, a higher drying temperature is required in the drying process, but this deteriorates the apparent flatness of the resin support, which makes subsequent processing difficult. Resorcinol is easy to coagulate into crystal in the drying process, adhere to the drying cabinet, long-time running can drip on the film, influence the apparent quality of the product, the continuity of production is influenced. Meanwhile, when the film produced by the process is used for an industrial radiographic film, the requirement on the adhesive fastness is high due to a subsequent special processing process, so that the apparent smoothness of the film is easily reduced. Resorcinol has toxic effect on aquatic organisms and has long-term influence on the aquatic environment.
Disclosure of Invention
The invention solves the technical problems of providing a water-based bottom layer composition with stable system and uniform coating; and secondly, the polyester film with the water-based bottom layer is provided, has good bonding fastness and stable performance, and can meet the requirements of the technical field of industrial radiographic inspection films and images.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the water-based bottom layer composition comprises the following components in parts by weight:
tetrapolymer water latex: 20-60 parts of
Gelatin: 5-20 parts of
Swelling agent: 1-5 parts of
Anti-blocking agent: 0.1 to 3 portions of
Deionized water: 100-500 parts;
the swelling agent is catechol, hydroquinone, pyrogallol, 4-chlorocatechol, 4-chlororesorcinol or 3-chlorocatechol in phenolic compounds.
The solid content of the quadripolymer latex is 20 percent, the PH value is 2-6,
in the aqueous base layer composition, the phenolic compound is 4-chlororesorcinol.
The anti-blocking agent is silica sol, the particle diameter is 0.2-1 mu m, and the using amount is 0.1-3 parts.
The water-based bottom layer polyester film comprises a base material and a water-based bottom layer, wherein the water-based bottom layer is formed by coating and drying the water-based bottom layer composition.
The thickness of the water-based bottom layer is 0.5-5 mu m.
The drying temperature of the water-based bottom layer polyester film is 90-130 ℃, and preferably 90-110 ℃.
An industrial radiographic inspection film comprises a base material, a water-based bottom layer and a functional layer, wherein the water-based bottom layer adopts the water-based bottom layer composition.
The waterborne bottom layer composition provided by the invention adopts quadripolymer water latex, and ensures the uniformity of a coating and the stability of the optical performance of a polyester film by adjusting the solid content.
According to the invention, the gelatin is adopted to improve the affinity of the surface of the bottom layer and improve the adhesion fastness of the subsequent functional layer and the bottom layer; the 4-chlororesorcinol is adopted to improve the adhesion fastness of the bottom layer and the base material, and meanwhile, the flatness of the sheet film is obviously improved, the coating continuity is improved, and the environmental pollution is reduced.
The aqueous bottom layer composition provided by the invention is beneficial to continuous production; the addition of the swelling agent improves the bonding fastness between the base material and the bottom layer and between the bottom layer and the functional layer. Meanwhile, in the production process, the drying temperature is reduced, so that the flatness of the film is improved, and the influence on the environment is reduced. The polyester film provided by the invention has good bonding fastness and smooth appearance, and can meet the use requirements of industrial radiographic testing films and medical digital dry films.
Drawings
FIG. 1 is a diagram of the structure of the product of the present invention;
FIG. 2 is a production flow chart of the product of the present invention;
FIG. 3 is a diagram of an industrial radiographic film according to the present invention.
Detailed Description
The quadripolymer water latex in the aqueous bottom layer composition is polymerized by vinylidene chloride, vinyl chloride, acrylic acid and ethyl methacrylate, the pH value of the aqueous bottom layer composition is controlled to be 2-6, and the solid content of the aqueous bottom layer composition is 15-20% so as to ensure that the aqueous bottom layer composition has a good film forming effect.
In the aqueous bottom layer composition, gelatin is used as a binder, and has good adhesion effect with the functional layer and the base material on the gelatin.
In the aqueous bottom layer composition, 4-chlororesorcinol exists as a swelling agent, the 4-chlororesorcinol can be compatible with other components, the composition system has good stability, the performance is more stable than resorcinol and catechol, and the excellent swelling effect can be achieved at lower temperature in the coating and drying process due to the low melting point of the resorcinol and the catechol, so that the adhesion fastness between the aqueous bottom layer and a base material is increased, the harm to equipment and environment caused by the addition of the resorcinol is overcome, the environmental pollution can be reduced, the energy is saved, and the continuous industrial production is facilitated.
The main solvent of the invention is deionized water which is used for adjusting the concentration of the composition and is beneficial to controlling the thickness of the coating.
The anti-blocking agent is added into the aqueous bottom layer composition, so that the surface adhesion of the polyester film is avoided, and the smoothness of the surface is improved. The anti-blocking agent is preferably used in the composition in an amount of 0.1 to 3 parts, with a particle diameter of 0.2 to 1 μm, within a range not to impair the coating adhesion. When the particle diameter is less than 0.2. mu.m, the anti-blocking effect is poor, and when the particle diameter is more than 1 μm, the blocking property of the coating layer is poor. When the using amount of the anti-blocking agent is less than 0.1 part, the anti-blocking effect cannot be achieved; when the amount of the anti-blocking agent is more than 3 parts, the adhesion of the coating surface is deteriorated. The anti-blocking agent is thermoplastic or thermosetting, and particles of polystyrene resin, acrylic resin, melamine resin, silicone resin, fluorine resin, urea resin, polyamide resin, and the like are used, and these resins are usually contained in the form of fine particles in the coating layer, and may be used alone or in combination of several kinds. The use of an antiblocking agent in the composition is preferably silica sol.
Ultraviolet absorbers, pigments, dyes, antistatic agents, and the like may also be added to the composition as needed. The thickness of the bottom layer of the polyester film is 0.5-5 mu m, when the thickness is less than 0.5 mu m, the adhesion fastness is poor, and when the thickness is more than 5 mu m, the cost is greatly increased.
Suitable substrates for the present invention are transparent or blue colored polypropylene, polyethylene, polyvinyl chloride, polyethylene terephthalate, and the like, with blue colored polyethylene terephthalate being preferred.
The waterborne bottom layer composition can be coated on the surface of a base material in an on-line coating mode and dried to prepare a polyester film with a bottom layer. And coating the functional layers (emulsion layer and protective film layer) of the industrial radiographic testing film on the polyester film in an extrusion coating mode, and drying to obtain the industrial radiographic testing film.
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
Preparation of aqueous underlayer composition:
tetrapolymer water latex: 20Kg
Gelatin: 5Kg
4-chlororesorcinol: 1Kg of
Silica sol (particle size 0.2 μm): 0.1Kg
Deionized water: 100 Kg.
Under the condition of continuous stirring, the above-mentioned materials are added according to the sequence, and after uniformly stirred, the water-base composition can be obtained, and can be used for stand-by.
Preparation of polyester film:
selecting and preparing a base material: (preferably polyethylene terephthalate)
The polyester raw material is subjected to melt extrusion, cold drum adsorption, longitudinal stretching, transverse stretching, corona treatment, on-line coating, drying, traction and rolling by an extruder to prepare the polyester film with the bottom layer.
The above composition was applied to the surface of a 175 μm polyester film by roll coating, and dried by heating at 90 ℃ for 2 minutes to obtain a polyester film having a coating thickness of 0.5 μm. The apparent mass was observed, and then the functional layers (emulsion layer, protective film layer) were applied by extrusion coating on the upper side, dried, and then the balance was carried out for 24 hours under a predetermined environmental condition, and then the practical bottom layer was tested for adhesion. The performance is shown in the table I.
Example 2
Preparation of aqueous underlayer composition:
tetrapolymer water latex: 30Kg
Gelatin: 8Kg
4-chlororesorcinol: 2Kg
Silica sol (particle size 0.4 μm): 1Kg of
Deionized water: 200 Kg.
Under the condition of continuous stirring, the above-mentioned materials are added according to the sequence, and after uniformly stirred, the water-base composition can be obtained, and can be used for stand-by.
Preparation of polyester film:
selecting and preparing a base material: (preferably polyethylene terephthalate)
The polyester raw material is subjected to melt extrusion, cold drum adsorption, longitudinal stretching, transverse stretching, corona treatment, on-line coating, drying, traction and rolling by an extruder to prepare the polyester film with the bottom layer.
The above composition was applied to the surface of a 175 μm polyester film by roll coating, and dried by heating at 100 ℃ for 2 minutes to obtain a polyester film having a coating thickness of 1 μm. The apparent mass was observed, and then the functional layers (emulsion layer, protective film layer) were applied by extrusion coating on the upper side, dried, and then the balance was carried out for 24 hours under a predetermined environmental condition, and then the practical bottom layer was tested for adhesion. The performance is shown in the table I.
Example 3
Preparation of aqueous underlayer composition:
tetrapolymer water latex: 40Kg
Gelatin: 10Kg of water
4-chlororesorcinol: 3Kg
Silica sol (particle size 0.5 μm): 1.5Kg
Deionized water: 300 Kg.
Under the condition of continuous stirring, the above-mentioned materials are added according to the sequence, and after uniformly stirred, the water-base composition can be obtained, and can be used for stand-by.
Preparation of polyester film:
selecting and preparing a base material: (preferably polyethylene terephthalate)
The polyester raw material is subjected to melt extrusion, cold drum adsorption, longitudinal stretching, transverse stretching, corona treatment, on-line coating, drying, traction and rolling by an extruder to prepare the polyester film with the bottom layer.
The above composition was applied to the surface of a 175 μm polyester film by roll coating, and dried by heating at 110 ℃ for 2 minutes to obtain a polyester film having a coating thickness of 2 μm. The apparent mass was observed, and then the functional layers (emulsion layer, protective film layer) were applied by extrusion coating on the upper side, dried, and then the balance was carried out for 24 hours under a predetermined environmental condition, and then the practical bottom layer was tested for adhesion. The performance is shown in the table I.
Example 4
Preparation of aqueous underlayer composition:
tetrapolymer water latex: 50Kg
Gelatin: 15Kg
4-chlororesorcinol: 4Kg
Silica sol (particle size 0.8 μm): 2Kg
Deionized water: 400 Kg.
Under the condition of continuous stirring, the above-mentioned materials are added according to the sequence, and after uniformly stirred, the water-base composition can be obtained, and can be used for stand-by.
Preparation of polyester film:
selecting and preparing a base material: (preferably polyethylene terephthalate)
The polyester raw material is subjected to melt extrusion, cold drum adsorption, longitudinal stretching, transverse stretching, corona treatment, on-line coating, drying, traction and rolling by an extruder to prepare the polyester film with the bottom layer.
The above composition was applied to the surface of a 175 μm polyester film by roll coating, and dried by heating at 120 ℃ for 2 minutes to obtain a polyester film having a coating thickness of 4 μm. The apparent mass was observed, and then the functional layers (emulsion layer, protective film layer) were applied by extrusion coating on the upper side, dried, and then the balance was carried out for 24 hours under a predetermined environmental condition, and then the practical bottom layer was tested for adhesion. The performance is shown in the table I.
Example 5
Preparation of aqueous underlayer composition:
tetrapolymer water latex: 60Kg
Gelatin: 20Kg
4-chlororesorcinol: 5Kg
Silica sol (particle size 1 μm): 3Kg
Deionized water: 500 Kg.
Under the condition of continuous stirring, the above-mentioned materials are added according to the sequence, and after uniformly stirred, the water-base composition can be obtained, and can be used for stand-by.
Preparation of polyester film:
selecting and preparing a base material: (preferably polyethylene terephthalate)
The polyester raw material is subjected to melt extrusion, cold drum adsorption, longitudinal stretching, transverse stretching, corona treatment, on-line coating, drying, traction and rolling by an extruder to prepare the polyester film with the bottom layer.
The above composition was applied to the surface of a 175 μm polyester film by roll coating, and dried by heating at 130 ℃ for 2 minutes to obtain a polyester film having a coating thickness of 5 μm. The apparent mass was observed, and then the functional layers (emulsion layer, protective film layer) were applied by extrusion coating on the upper side, dried, and then the balance was carried out for 24 hours under a predetermined environmental condition, and then the practical bottom layer was tested for adhesion. The performance is shown in the table I.
Comparative example 1
Preparation of aqueous underlayer composition:
tetrapolymer water latex: 30Kg
Gelatin: 10Kg of water
Resorcinol: 3Kg
Silica sol (particle size 0.6 μm): 1.5Kg
Deionized water: 300 Kg.
Under the condition of continuous stirring, the above-mentioned materials are added according to the sequence, and after uniformly stirred, the water-base composition can be obtained, and can be used for stand-by.
Preparation of polyester film:
selecting and preparing a base material: (preferably polyethylene terephthalate)
The polyester raw material is subjected to melt extrusion, cold drum adsorption, longitudinal stretching, transverse stretching, corona treatment, on-line coating, drying, traction and rolling by an extruder to prepare the polyester film with the bottom layer.
The above composition was applied to the surface of a 175 μm polyester film by roll coating, and dried by heating at 100 ℃ for 2 minutes to obtain a polyester film having a coating thickness of 3 μm. The apparent mass was observed, and then the functional layers (emulsion layer, protective film layer) were applied by extrusion coating on the upper side, dried, and then the balance was carried out for 24 hours under a predetermined environmental condition, and then the practical bottom layer was tested for adhesion. The performance is shown in the table I.
Comparative example 2
Preparation of aqueous underlayer composition:
tetrapolymer water latex: 30Kg
Gelatin: 10Kg of water
Catechol: 3Kg
Silica sol (particle size 0.6 μm): 1.5Kg
Deionized water: 300 Kg.
Under the condition of continuous stirring, the above-mentioned materials are added according to the sequence, and after uniformly stirred, the water-base composition can be obtained, and can be used for stand-by.
Preparation of polyester film:
selecting and preparing a base material: (preferably polyethylene terephthalate)
The polyester raw material is subjected to melt extrusion, cold drum adsorption, longitudinal stretching, transverse stretching, corona treatment, on-line coating, drying, traction and rolling by an extruder to prepare the polyester film with the bottom layer.
The above composition was applied to the surface of a 175 μm polyester film by roll coating, and dried by heating at 100 ℃ for 2 minutes to obtain a polyester film having a coating thickness of 3 μm. The apparent mass was observed, and then the functional layers (emulsion layer, protective film layer) were applied by extrusion coating on the upper side, dried, and then the balance was carried out for 24 hours under a predetermined environmental condition, and then the practical bottom layer was tested for adhesion. The performance is shown in the table I.
Comparative example 3
Preparation of aqueous underlayer composition:
tetrapolymer water latex: 30Kg
Gelatin: 10Kg of water
Silica sol (particle size 0.6 μm): 1.5Kg
Deionized water: 300 Kg.
Under the condition of continuous stirring, the above-mentioned materials are added according to the sequence, and after uniformly stirred, the water-base composition can be obtained, and can be used for stand-by.
Preparation of polyester film:
selecting and preparing a base material: (preferably polyethylene terephthalate)
The polyester raw material is subjected to melt extrusion, cold drum adsorption, longitudinal stretching, transverse stretching, corona treatment, on-line coating, drying, traction and rolling by an extruder to prepare the polyester film with the bottom layer.
The above composition was applied to the surface of a 175 μm polyester film by roll coating, and dried by heating at 100 ℃ for 2 minutes to obtain a polyester film having a coating thickness of 3 μm. The apparent mass was observed, and then the functional layers (emulsion layer, protective film layer) were applied by extrusion coating on the upper side, dried, and then the balance was carried out for 24 hours under a predetermined environmental condition, and then the practical bottom layer was tested for adhesion. The performance is shown in the table I.
Evaluation method of Performance:
1. apparent mass
The coated sample was observed for apparent mass with reflected light under a fluorescent lamp. Stipulating: 1. the phenomena of halo and generation are uniform, and 2, the phenomena of halo and generation are non-uniform.
2. Flatness detection
The coated film was cut into a sample sheet with a specification of 270 × 210mm, and the warp heights of the four sides were observed on a glass plate.
Stipulating: 1. the amount of the non-tilting is A, and the optimal value is. 2. Good, the tilting height of 0-1mm is B. 3. The worst is C when the tilting height is more than 1 mm.
3. Evaluation of coating continuity
The composition is coated on a polyester film on line by a wire rod, when the composition passes through a drying process, a swelling agent is coagulated into aggregates which are easy to drop on the surface of a sheet membrane, the apparent quality of the sheet membrane is influenced, the sheet membrane is produced after a drying channel is cleaned by the sheet segments, and the following steps are compared: the time interval from the start of dry production to the occurrence of dropping of the aggregate was evaluated to determine the quality of the coating continuity. The shortest interval time is poor, the longer the dripping phenomenon is good, and the no dripping phenomenon is good.
4. Practical adhesion detection:
and (3) coating the coated film with a finishing emulsion of an industrial radiographic inspection film in a ring-and-loop manner, drying, standing at room temperature for 24 hours, and cutting into long strips with the length of 35cm and the width of 25cm as dry and wet fastness samples.
Firstly, detecting dry fastness:
and (3) scribing 7 parallel scratches on the surface of the emulsion of the sample to be detected by using a wallpaper cutter, and then perpendicularly scribing 7 parallel scratches to form 36 squares with the side length of 7 mm. The adhesive tape was stuck to the surface of the emulsion and then pulled out rapidly at an angle of 180 °. In this test, class a means that 100% of the emulsion layer is not peeled off; grade B means 80% to 100% of the emulsion layer is not peeled off; grade C means that less than 80% of the emulsion layer is not peeled off.
Secondly, detecting wet fastness:
at each stage of development, fixing and water washing, two mutually perpendicular cross scratches were scribed on the emulsion layer with a wallpaper knife, and the emulsion surface was strongly rubbed five times with fingertips. The adhesive strength of the adhesive was evaluated by the maximum width of the peeled emulsion layer. In this test, class a refers to the case where the latex layer cannot be peeled off after scratching; grade B means less than 5 mm; grade C means greater than 5 mm. In order to obtain sufficient image information, a is preferable.
The specific test cases are shown in the following table:
the results in Table 1 show that the polyester films prepared in examples 1 to 5 containing the aqueous bottom composition of 4-chlororesorcinol have good adhesion and excellent quality, can be continuously produced industrially, can meet the requirements of industrial radiographic films and imaging technology fields, and achieve the purpose of the invention. The polyester film of comparative example 3, which did not contain the aqueous composition of 4-chlororesorcinol as a substrate, was the least adhesive and inferior in quality, and could not be used as a substrate for the preparation of industrial radiographic films.
The above embodiments are merely representative examples of the present invention, and it is obvious that the technical solution of the present invention is not limited to the above embodiments, and many variations are possible. Equivalent alterations and modifications of the present invention as would be apparent to those of ordinary skill in the art from the present disclosure are considered to be within the scope of the present invention.
Claims (7)
1. The aqueous base layer composition is characterized by comprising the following components in parts by weight:
tetrapolymer water latex: 20-60 parts of
Gelatin: 5-20 parts of
Swelling agent: 1-5 parts of
Anti-blocking agent: 0.1 to 3 portions of
Deionized water: 100-500 parts;
the quadripolymer water latex is polymerized by vinylidene chloride, chloroethylene, acrylic acid and ethyl methacrylate, the pH value is controlled between 2 and 6, and the solid content is between 15 and 20 percent;
the swelling agent is 4-chlororesorcinol.
2. The underlayer composition of claim 1, wherein the tetrapolymer water latex has a solid content of 20% and a pH of 2 to 6.
3. The aqueous underlayer composition of claim 2, where the anti-blocking agent is silica sol, the particle diameter is 0.2 to 1 μm, and the amount used is 0.1 to 3 parts by mass.
4. A polyester film comprising a substrate and a water-based primer layer, wherein the water-based primer layer is formed by coating and drying the water-based primer composition of claim 1, 2 or 3.
5. The polyester film according to claim 4, wherein the thickness of the water-based primer layer is 0.5 to 5 μm.
6. The polyester film according to claim 5, wherein the drying temperature is 90 to 130 ℃.
7. An industrial radiographic film comprising a substrate, an aqueous primer layer and a functional layer, wherein the aqueous primer layer comprises the aqueous primer composition according to any one of claims 1 to 3.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403270A (en) * | 2001-08-23 | 2003-03-19 | 中国乐凯胶片集团公司 | Making process of polyester support with bottom layer for painting photosensitive emulsion |
| CN1403872A (en) * | 2001-08-23 | 2003-03-19 | 中国乐凯胶片集团公司 | Dacron film substrate containing new-type antistatic agent |
| CN101376796A (en) * | 2008-09-08 | 2009-03-04 | 河北华夏实业有限公司 | Aqueous bottom glue for soft polychloroethylene contact adhesive tape and manufacturing method thereof |
| CN106928785A (en) * | 2015-12-30 | 2017-07-07 | 乐凯华光印刷科技有限公司 | A kind of PET film bottom antistatic coating fluid and its preparation method and application |
-
2017
- 2017-12-20 CN CN201711385265.8A patent/CN108148473B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403270A (en) * | 2001-08-23 | 2003-03-19 | 中国乐凯胶片集团公司 | Making process of polyester support with bottom layer for painting photosensitive emulsion |
| CN1403872A (en) * | 2001-08-23 | 2003-03-19 | 中国乐凯胶片集团公司 | Dacron film substrate containing new-type antistatic agent |
| CN101376796A (en) * | 2008-09-08 | 2009-03-04 | 河北华夏实业有限公司 | Aqueous bottom glue for soft polychloroethylene contact adhesive tape and manufacturing method thereof |
| CN106928785A (en) * | 2015-12-30 | 2017-07-07 | 乐凯华光印刷科技有限公司 | A kind of PET film bottom antistatic coating fluid and its preparation method and application |
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| CN108148473A (en) | 2018-06-12 |
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