CN112844944A - Preparation method of low-color hardened precoated base film - Google Patents
Preparation method of low-color hardened precoated base film Download PDFInfo
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- CN112844944A CN112844944A CN202110204334.0A CN202110204334A CN112844944A CN 112844944 A CN112844944 A CN 112844944A CN 202110204334 A CN202110204334 A CN 202110204334A CN 112844944 A CN112844944 A CN 112844944A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/06—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length by rubbing contact, e.g. by brushes, by pads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
- B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
- B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0873—Controlling means responsive to conditions of the liquid or other fluent material, of the ambient medium, of the roller or of the work
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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
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
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- C—CHEMISTRY; METALLURGY
- 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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
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Abstract
The invention discloses a preparation method of a low-color hardened precoated base film, and relates to the technical field of polyester optical materials. The invention comprises the following steps: heating the mixed solution of 95% of PET resin and 5% of auxiliary agent in the raw material of the second layer by a heating assembly; step two, crystallization: crystallizing the assistant mixed solution by hot air circulation airflow provided by a fan; step three, slicing: the materials are uniformly stirred along with a rotator in the pulsating crystallization bed, the moisture in the materials is removed, and the materials are placed in a drying tower to be sliced after being agglomerated. The low-color hardening precoated base film material provided by the invention has the basic characteristics of high light transmittance, low haze, high hardness, no brittleness and the like, and the multi-functionality curing resin is introduced to improve the elastic modulus of the film material, so that the hardened film has excellent scratch resistance, and is prepared by extrusion, sheet casting, longitudinal drawing, transverse drawing, coating and heat setting after melt drying in the traditional process, and especially technical innovation is carried out in coating.
Description
Technical Field
The invention belongs to the technical field of polyester optical materials, and particularly relates to a preparation device of a low-color hardening precoated base film.
Background
The liquid crystal display is one of flat panel displays. The screen display device is used for screen display of televisions and computers. The display screen has the advantages of low power consumption, small size and low radiation.
In recent years, the liquid crystal display industry in China is rapidly developing, and the development and production of polyester films with optical functions as base film products at the upstream of the industry chain are still a weak link in the whole liquid crystal display industry chain, and a hardened film is a general name of a film with optical functions, and is a hard coating layer coated on a film material such as polyethylene terephthalate (PET) or Polycarbonate (PC) by using a precise coating technology, and the main purpose is to improve the hardness of the film material and prevent the film material from being damaged and influencing the functions of the film material.
Disclosure of Invention
The invention aims to provide a device for preparing a low-color hardening precoated base film, which is characterized in that the provided low-color hardening film material has the basic characteristics of high light transmittance, low haze and high hardness without brittleness, and a polyfunctional curing resin is introduced to improve the elastic modulus of the film material so that the scratch resistance of the hardened film is excellent. The copolyester base film is prepared by extrusion, sheet casting, longitudinal stretching and transverse stretching, coating and heat setting after melting and drying in the traditional process, technical innovation is particularly carried out in coating, and the stable and uniform dispersion effect in the copolyester material is realized by adopting nano-scale particles, so that the stability of the surface performance of the copolyester base film in downstream processing and in the using process is ensured. The coating amount of the coating liquid on the film in unit time can be changed by utilizing a compression roller to press the film uniformly. And (4) pre-coating treatment. The pre-coating treatment is to coat a nano-level optical coating on the surface of the polyester film, and the optical coating realizes the function of weakening or even eliminating rainbow lines, thereby solving the problems in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a device for preparing a low-color hardening pre-coating base film comprises a method for preparing the low-color hardening pre-coating base film, and comprises the following steps:
step one, heating: heating the mixed solution of 95% of PET resin and 5% of auxiliary agent in the raw material of the second layer by a heating assembly;
step two, crystallization: crystallizing the assistant mixed solution by hot air circulation airflow provided by a fan;
step three, slicing: the materials are uniformly stirred along with a rotator in the pulsating crystallization bed, the moisture in the materials is removed, and the materials are placed in a drying tower to be sliced after being agglomerated.
Optionally, the crystallization drying temperature in the second step is 175-200 ℃, the crystallization time is 5-10min, the drying time is 60-90min, the crystallinity in the second step reaches 35% -42%, and the moisture content W (H2O) < 35 ppm.
Optionally, the coating head is connected with the three-layer co-extrusion system, the fine filter is installed on one side of the three-layer co-extrusion system, the pre-filter is arranged on one side of the fine filter, the melt pipeline is connected to one side of the pre-filter, one end of the melt pipeline is connected with the extruder, the polyester chip filter is connected to one side of the extruder, and the material inlet valve is arranged on one side of the polyester chip filter.
Optionally, one end of the material inlet valve is provided with a drying tower, a heater is arranged on the first side of the drying tower, a material conveying pipeline is arranged on the second side of the drying tower, a material conveying rotator is arranged on one side of the material conveying pipeline, an air duct is arranged on the third side of the drying tower, and a pre-dryer is arranged on the fourth side of the drying tower.
Optionally, a fan is arranged on one side of the heater, a pneumatic control valve is installed on one side of the fan, a pre-dehumidifier is installed on one side of the pneumatic control valve, an air conveying pipeline is connected to one side of the pre-dehumidifier, a cyclone separator is connected to one end of the air conveying pipeline, and the cyclone separator is connected to one end of the air pipeline.
Optionally, an air filter is installed at a first side of the cyclone separator, and a dust hopper is installed at a second side of the cyclone separator.
Optionally, an air pipeline is installed at one side of the pre-dryer, a filter is installed at one end of the air pipeline, and an air pretreatment device is installed at one side of the filter.
Optionally, two coating rollers are mounted on one side of the coating head, a coating film is slidably fitted between the two coating rollers, one side of one coating roller is connected with a lower coating liquid distribution roller, one side of the other coating roller is connected with an upper coating liquid distribution roller, one side of the lower coating liquid distribution roller is connected with a lower metering roller, and one side of the upper coating liquid distribution roller is connected with an upper metering roller.
Optionally, a flattening roller is rotationally matched on the upper side of the coating film, a tension roller, a leading-in guide roller and a coating film leading-out roller are rotationally matched on the lower side of the coating film, and the tension roller is located between the leading-in guide roller and the coating film leading-out roller.
Optionally, the upper metering roll is located on the upper side of the coating film and the lower metering roll is located on the lower side of the coating film.
The embodiment of the invention has the following beneficial effects:
one embodiment of the invention provides a low-color hardening precoated base film material which has the basic characteristics of high light transmittance, low haze, high hardness and no brittleness, and introduces a multifunctional curing resin to improve the elastic modulus of the film material, so that the hardened film has excellent scratch resistance. The copolyester base film is prepared by extrusion, sheet casting, longitudinal stretching and transverse stretching, coating and heat setting after melting and drying in the traditional process, technical innovation is particularly carried out in coating, and the stable and uniform dispersion effect in the copolyester material is realized by adopting nano-scale particles, so that the stability of the surface performance of the copolyester base film in downstream processing and in the using process is ensured. The coating amount of the coating liquid on the film in unit time can be changed by utilizing a compression roller to press the film uniformly. And (4) pre-coating treatment. The pre-coating treatment is to coat a nano-scale optical coating on the surface of the polyester film, and the optical coating can weaken or even eliminate rainbow lines.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a crystallization drying system according to an embodiment of the present invention;
FIG. 2 is a schematic view of an on-line coating structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the principle of thin film surface interference according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
the three-layer co-extrusion system comprises a three-layer co-extrusion system 1, a fine filter 2, a pre-filter 3, a melt pipeline 4, an extruder 5, a polyester chip filter 6, a material port valve 7, a drying tower 8, a heater 9, a fan 10, a pneumatic control valve 11, a pre-dehumidifier 12, an air conveying pipeline 13, a pulsating crystallization bed 14, a rotator 15, a feeding rotator 16, a material conveying pipeline 17, a pre-dryer 18, an air pipeline 19, a cyclone separator 20, a dust hopper 21, an air filter 22, an air pretreatment device 23, a filter 24, an air pipeline 25, a coating head 26, a coating roller 27, an upper metering roller 28, a flattening roller 29, a tension roller 30, an introduction guide roller 31, an upper coating liquid distribution roller 32, a lower coating liquid distribution roller 33, a coating film 34, a coating film derivation roller 35 and a lower metering roller 36.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and in no way should be taken as any limitation on the present invention and its applications or uses.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.
Referring to fig. 1-3, in this embodiment, an apparatus for preparing a low-color-cured precoated base film is provided, including: a preparation method of a low-color hardening precoated base film comprises the following steps:
step one, heating: heating the mixed solution of 95% of PET resin and 5% of auxiliary agent in the raw material of the second layer by a heating assembly;
step two, crystallization: crystallizing the assistant mixed solution by using hot air circulating airflow provided by the fan 10;
step three, slicing: the materials are uniformly stirred along with a rotator 15 in a pulsating crystallization bed 14, the moisture in the materials is removed, and the materials are placed in a drying tower to be blocked and then sliced.
The application of one aspect of the embodiment is as follows:
mixing 95% of PET resin and 5% of auxiliary agent serving as a raw material of the second layer, feeding the mixture into a pulse crystallization bed 14 in a crystallization drying tower 8 through a rotator 15, heating the mixture by a heater 9, supplying crystallization hot air circulation airflow by a fan 10, wherein the crystallization drying temperature is 175-200 ℃, the crystallization time is 5-10min, the drying time is 60-90min, and the pre-crystallization degree of the dried polyester slices reaches 35-42%; the moisture content WH2O is less than 35ppm, the material is uniformly stirred with a rotator 15 in a pulsating crystallization bed 14 to remove the moisture in the material, the material is placed in a drying tower to be agglomerated, when the moisture and temperature standards of the polyester cast sheet are reached, a pneumatic control valve is opened, a fan 10 runs in reverse, clean air is conveyed to a cyclone separator 20 through a pre-dehumidifier 12 and an air conveying pipeline 13, in the pulsating crystallization bed 14, as the polyester cast sheet rotates at high speed along with the rotator 15, some dust-containing particles enter the cyclone separator 20 through a pipeline under the action of centrifugal force to fall into a dust hopper 21, the air used in a drying hot air system is supplied by an air pretreatment device 23, a part of the air pretreatment device 23 is supplied by the cyclone separator 20, but enters the air pretreatment device 23 after being filtered by an air filter 22, and the air passes through the air pretreatment device 23 and an air pipeline 25, The filter 24 enters a drying system, a material port valve 7 is installed at the bottom of a drying tower 8, a dried cast sheet enters a polyester cast sheet filter 6 through the material port valve 7 and then enters an extruder 5, the temperature of the extruder is 215-270 ℃, the dried cast sheet enters a three-layer co-extrusion system 1 through a pre-filter 3 and a fine filter 2 to be melted and extruded, a die head is controlled to be stabilized at 255-285 ℃, the extrusion flow of the raw materials of a first layer and a third layer is the same as that of the raw materials of a second layer, the raw materials of the first layer enter the extrusion system of the first layer, the raw materials of the second layer enter the extrusion system of the second layer, the raw materials of the third layer enter the extrusion system of the third layer to be co-extruded, the polyester base film cast sheet which is co-extruded in a three-layer mode is longitudinally stretched by 2.8-3.8 times through the speed difference between a slow drawing roller and a fast drawing roller in a heating state and then is, stretching 2.8-3.8 times at 90-155 ℃ in a transverse stretching section, shaping at 180-220 ℃ in a heat shaping section, cooling at 30-50 ℃ and room temperature, and rolling to obtain a low-color hardened polyester base film finished product;
100 parts of mass components: 1.6-hexanediol diacrylate 60 as an active diluent, 20 as a curing agent, 10 as a nano organic material polycarbonate and 10 as an organic stabilizer are weighed, 60% of 1, 6-hexanediol diacrylate, 20% of a curing resin, 10% of a nano organic material and 10% of an organic stabilizer are stirred at 35 ℃ for 0.5h to be uniformly mixed, a coating trolley is pushed to the lower side of a running film, the film runs at a speed of 15-70m/min, a film guide roller 31 and a tension roller 30 guide the film from a longitudinal pulling device into a coating device, so that the surface tension of the film is increased, the subsequent coating treatment is uniformly leveled, the coating liquid is firmly attached to the surface of the film, an upper metering roller 28 starts to meter the coating amount according to the specification of the film, an upper coating liquid distribution roller 32 starts to uniformly coat the liquid according to the information transmitted by the upper metering roller 28, a film flattening roller 29 is a rubber roller with a spreading line, the film is flattened when the film passes over the film, the upper metering roll 28 facilitates the uniform coating of the coating liquid on the film, the coating roll 27 is a metal roll with a specially treated surface, in order to ensure the uniform coating of the coating liquid on the film, the press roll presses the film to be coated on the coating roll 27 during production, the coating liquid on the coating roll is uniformly transferred to the film through the action of the press roll, the coating amount of the coating liquid on the film in unit time can be changed by adjusting the tightness degree of the press roll pressing the film, the gap between the coating head 26 and the substrate determines the coating thickness, the excessive slurry is scraped and reflowed, and a uniform coating layer is formed on the surface of the substrate, the coating liquid is transferred to the film through the coating roll 27, the surface treatment of the coating roll for coating is usually carried out according to the coating liquid to be coated, The coating process and the requirements of final products are different, the coating film is dried and cured for about 1min to obtain a hardened film polyester base film, the coating surface reaches the standard requirements, then the coating film is guided out by a coating film guide-out roller 35 and enters a transverse stretching process, if double-sided coating is carried out, a lower coating roller, a lower metering roller 36 and a lower coating liquid distribution roller 33 can be used for coating, as shown in figure 3, the rainbow lines of the film are color stripes formed on the surface of the film, the color stripes can be seen on the surface of a mobile phone screen, a large mother roll of a PET film, a polarizer and the edge of the film, the color stripes are mechanism-double-light interference generated by the rainbow lines, the thickness of the polymer film is far larger than the wavelength range of visible light, the geometrical optical analysis is suitable, as shown in figure three is a film surface interference principle diagram, light incident light 0 emitted by a light source irradiates the surface of the film, a part of light is reflected, the other part of the light is refracted to enter the film transmission light 1, and is reflected/refracted again at the lower surface/air interface layer of the film, the reflected light 3 enters the air reflection light 2 through the upper surface/air interface layer, the reflected light 1 and the reflected light 2 have interference effect in the air, and for the light with different wavelengths, the color of the light entering human eyes is changed compared with the incident light, and the factors influencing the interference color of the reflected light 1 and the reflected light 2 include: the incident angle alpha, the film refractive index n1, the film thickness h, the refractive index n0 of the medium on both sides of the film, n2, when the film is a uniform medium with constant thickness, the reflected light is a single color light, when the film is abnormal, such as uneven thickness, uneven film crystallization, and the like, the problem that the refractive index is uneven, and the like, and the film has obvious color difference with the adjacent area, namely rainbow lines, for example, heating in the processing process of a hardened layer can cause the change of a pre-coating layer, and obvious rainbow lines are caused, and from the analysis, the improvement of the thickness uniformity of the film, the improvement of the film thickness within an allowable range, the reduction of the definition of the film can reduce the rainbow lines, but the above conditions are not suitable for the production status quo of BOPET, and company technicians provide a more feasible scheme: the pre-coating treatment is to coat a layer of nano-scale optical coating on the surface of the BOPET, and the optical coating can weaken or even eliminate rainbow lines. It should be noted that the electric devices referred to in this application may be powered by a storage battery or an external power source.
Main technical indexes
The low-color hardening precoated base film material has the basic characteristics of high light transmittance, low haze, high hardness, no brittleness and the like, and the multi-functionality curing resin is introduced to improve the elastic modulus of the film material so that the hardened film has excellent scratch resistance. The copolyester base film is prepared by extrusion, sheet casting, longitudinal stretching and transverse stretching, coating and heat setting after melting and drying in the traditional process, technical innovation is particularly carried out in coating, and the stable and uniform dispersion effect in the copolyester material is realized by adopting nano-scale particles, so that the stability of the surface performance of the copolyester base film in downstream processing and in the using process is ensured. The coating amount of the coating liquid on the film in unit time can be changed by utilizing a compression roller to press the film uniformly. And (4) pre-coating treatment. The pre-coating treatment is to coat a nano-scale optical coating on the surface of the polyester film, and the optical coating can weaken or even eliminate rainbow lines.
In the second step of this embodiment, the crystallization drying temperature is 175-200 ℃, the crystallization time is 5-10min, the drying time is 60-90min, the crystallinity in the second step reaches 35% -42%, and the moisture content WH2O is less than 35 ppm.
The three-layer co-extrusion system 1 and the coating head 26 of the embodiment have the advantages that the fine filter 2 is installed on one side of the three-layer co-extrusion system 1, the pre-filter 3 is arranged on one side of the fine filter 2, the solution pipeline 4 is connected to one side of the pre-filter 3, the extruder 5 is connected to one end of the solution pipeline 4, the polyester chip filter 6 is connected to one side of the extruder 5, and the material inlet valve 7 is arranged on one side of the polyester chip filter 6.
In the embodiment, a drying tower 8 is arranged at one end of the material port valve 7, a heater 9 is arranged at a first side of the drying tower 8, a material conveying pipeline 17 is arranged at a second side of the drying tower 8, a material conveying rotator 16 is arranged at one side of the material conveying pipeline 17, an air duct 19 is arranged at a third side of the drying tower 8, and a pre-dryer 18 is arranged at a fourth side of the drying tower 8.
In the embodiment, a fan 10 is disposed at one side of the heater 9, a pneumatic control valve 11 is installed at one side of the fan 10, a pre-dehumidifier 12 is installed at one side of the pneumatic control valve 11, an air conveying pipeline 13 is connected to one side of the pre-dehumidifier 12, a cyclone 20 is connected to one end of the air conveying pipeline 13, and the cyclone 20 is connected to one end of an air pipeline 19.
The cyclone separator 20 of the present embodiment is provided with an air filter 22 at a first side thereof and a dust hopper 21 at a second side thereof, and the dust hopper 21 is conveniently connected to the cyclone separator 20.
The pre-dryer 18 of the present embodiment is provided with an air duct 25 at one side thereof, a filter 24 at one end of the air duct 25, and an air pre-treatment device 23 at one side of the filter 24.
In the present embodiment, two coating rolls 27 are attached to one side of the coating head 26, a coating film 34 is slidably fitted between the two coating rolls 27, a lower coating dispensing roll 33 is connected to one side of one of the coating rolls 27, an upper coating dispensing roll 32 is connected to one side of the other coating roll 27, a lower metering roll 36 is connected to one side of the lower coating dispensing roll 33, and an upper metering roll 28 is connected to one side of the upper coating dispensing roll 32.
The nip roll 29 is rotatably fitted to the upper side of the coating film 34 of the present embodiment, the tension roll 30, the introduction guide roll 31, and the coating film discharge roll 35 are rotatably fitted to the lower side of the coating film 34, and the tension roll 30 is positioned between the introduction guide roll 31 and the coating film discharge roll 35.
The upper metering roll 28 of this embodiment is located on the upper side of the coating film 34, and the lower metering roll 36 is located on the lower side of the coating film 34.
The above embodiments may be combined with each other.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Claims (10)
1. A preparation method of a low-color hardening precoated base film is characterized by comprising the following steps:
step one, heating: heating the mixed solution of 95% of PET resin and 5% of auxiliary agent in the raw material of the second layer by a heating assembly;
step two, crystallization: crystallizing the auxiliary agent mixed solution by hot air circulating airflow provided by the fan (10);
step three, slicing: the materials are uniformly stirred along with a rotator (15) in a pulsating crystallization bed (14), the moisture in the materials is removed, and the materials are placed in a drying tower to be blocked and then sliced.
2. The method for preparing a low-color-hardening precoated base film as claimed in claim 1, wherein the crystallization drying temperature in step two is 175-200 ℃, the crystallization time is 5-10min, the drying time is 60-90min, the crystallinity in step two is 35-42%, and the moisture content W (H2O) < 35 ppm.
3. The device for preparing the low-color-hardening precoated base film according to claim 2, wherein the three-layer co-extrusion system (1) and the coating head (26) are arranged, the fine filter (2) is arranged on one side of the three-layer co-extrusion system (1), the pre-filter (3) is arranged on one side of the fine filter (2), the melt pipeline (4) is connected to one side of the pre-filter (3), the extruder (5) is connected to one end of the melt pipeline (4), the polyester chip filter (6) is connected to one side of the extruder (5), and the material port valve (7) is arranged on one side of the polyester chip filter (6).
4. The apparatus for manufacturing a low-color hardened precoated base film according to claim 3, wherein the drying tower (8) is provided at one end of the port valve (7), the heater (9) is provided at a first side of the drying tower (8), the feed line (17) is provided at a second side of the drying tower (8), the feed rotator (16) is provided at one side of the feed line (17), the air duct (19) is provided at a third side of the drying tower (8), and the pre-dryer (18) is provided at a fourth side of the drying tower (8).
5. The apparatus for manufacturing a low-color hardened precoated base film according to claim 4, wherein a fan (10) is provided at one side of the heater (9), a pneumatic control valve (11) is installed at one side of the fan (10), a pre-dehumidifier (12) is installed at one side of the pneumatic control valve (11), an air supply line (13) is connected to one side of the pre-dehumidifier (12), a cyclone (20) is connected to one end of the air supply line (13), and the cyclone (20) is connected to one end of the air supply line (19).
6. The apparatus for manufacturing a low-color hardened precoated base film according to claim 5, wherein the first side of the cyclone (20) is provided with an air filter (22), and the second side of the cyclone (20) is provided with a dust hopper (21).
7. The apparatus for manufacturing a low-color-cured precoated base film according to claim 6, wherein the air duct (25) is installed at one side of the predryer (18), the filter (24) is installed at one end of the air duct (25), and the air pretreatment device (23) is installed at one side of the filter (24).
8. The apparatus for manufacturing a low-color hardened precoated base film according to claim 7, wherein two coating rolls (27) are installed at one side of the coating head (26), a coating film (34) is slidably fitted between the two coating rolls (27), one side of one coating roll (27) is connected to the lower coating dispensing roll (33), one side of the other coating roll (27) is connected to the upper coating dispensing roll (32), one side of the lower coating dispensing roll (33) is connected to the lower metering roll (36), and one side of the upper coating dispensing roll (32) is connected to the upper metering roll (28).
9. The apparatus for manufacturing a low-color hardened precoated base film according to claim 8, wherein the upper side of the coating film (34) is rotatably fitted with a spreader roll (29), the lower side of the coating film (34) is rotatably fitted with a tension roll (30), an introduction guide roll (31), and a coating film discharge roll (35), and the tension roll (30) is located between the introduction guide roll (31) and the coating film discharge roll (35).
10. The apparatus for manufacturing a low-color hardened pre-coated base film according to claim 9, wherein the upper metering roll (28) is located on the upper side of the coating film (34), and the lower metering roll (36) is located on the lower side of the coating film (34).
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| CN202110204334.0A CN112844944A (en) | 2021-02-24 | 2021-02-24 | Preparation method of low-color hardened precoated base film |
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| CN202110204334.0A CN112844944A (en) | 2021-02-24 | 2021-02-24 | Preparation method of low-color hardened precoated base film |
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Cited By (1)
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