CN111690334A - Transparent anti-UV polyester film for back plate and preparation method thereof - Google Patents
Transparent anti-UV polyester film for back plate and preparation method thereof Download PDFInfo
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- CN111690334A CN111690334A CN202010554043.XA CN202010554043A CN111690334A CN 111690334 A CN111690334 A CN 111690334A CN 202010554043 A CN202010554043 A CN 202010554043A CN 111690334 A CN111690334 A CN 111690334A
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/255—Polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/322—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of solar panels
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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Abstract
The invention discloses a transparent anti-UV polyester film for a back plate and a preparation method thereof, aiming at providing an anti-UV polyester film with good anti-UV effect, strong stability and strong practicability, and the technical scheme is characterized in that an anti-UV material is added into the anti-UV polyester film, the anti-UV material comprises 1-5% of an ultraviolet absorbent and 1-5% of a light stabilizer, and compared with a common polyester film, the absorption peak in an ultraviolet band is obviously improved; the transmittance is less than 10% at the ultraviolet 380nm position; after irradiation for 200kwh, the yellowing is less than or equal to 3; after PCT48h, the breaking elongation retention rate is more than or equal to 40 percent, and the invention is suitable for the technical field of polyester films.
Description
Technical Field
The invention relates to the technical field of polyester films, in particular to a transparent anti-UV polyester film for a back plate and a preparation method thereof.
Background
With the trend of 'large silicon chip', 'large size' and 'high power' assemblies, the traditional double-glass assembly is too heavy to bring great difficulty to installation. The transparent back plate can replace glass of an air layer, so that the overall thickness is reduced, and the installation is convenient.
Double glass assembly is fragile more in hail injury area, uses transparent backplate to destroy the risk and can reduce.
The double-glass assembly generally adopts the voting POE to prevent the damage of the UV transmitted from the back to the back of the battery, and the transparent backlight assembly can well separate the ultraviolet rays, thereby protecting the battery and the packaging material.
Therefore, the ultraviolet resistance of the back sheet needs to be improved by the UV resistant polyester film.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the anti-UV polyester film with good anti-ultraviolet effect, strong stability and strong practicability.
In order to achieve the purpose, the invention provides the following technical scheme: the transparent anti-UV polyester film for the back plate comprises the following components in parts by weight: 26-29 parts of polyethylene terephthalate, 22-27 parts of polybutylene terephthalate, 18-23 parts of polydiallyl terephthalate, 4-9 parts of vinyl acetate, 6-8 parts of gluconolactone and 7-10 parts of isoamyl acetate; the anti-UV polyester film is further added with an anti-UV material, wherein the anti-UV material comprises 1% -5% of an ultraviolet absorbent and 1% -5% of a light stabilizer.
The invention is further configured to: the ultraviolet absorbent comprises one or more of salicylic acid esters, benzophenones, benzotriazoles, benzoates and other organic compounds; the light stabilizer comprises one or more of NBC770, 2002, 1084 and the like.
The invention is further configured to: the anti-UV polyester film further comprises an anti-aging layer, wherein the anti-aging layer is made of 100 parts by weight of butylene terephthalate and a butylene terephthalate copolymer, 40-50 parts by weight of polylactic acid, 55-65 parts by weight of nano calcium carbonate and 0.8-1.2 parts by weight of erucamide.
The invention is further configured to: the anti-UV polyester film further comprises an adhesive, wherein the adhesive comprises 20-25% of MDI, 20-25% of polypropylene oxide, 6-10% of methyl isobutyl ketone, 10-15% of propylene glycol methyl ether acetate, 3-5% of phenolic resin, 3-5% of acetone, 5-10% of ethylbenzene and the balance of xylene.
The invention is further configured to: the adhesive also comprises an ultraviolet absorber and a light stabilizer, wherein the ultraviolet absorber and the light stabilizer are dispersed in the adhesive through ultrasonic waves.
By adopting the technical scheme, the UV-resistant polyester film has the beneficial effects that 1, the UV-resistant material is added into the UV-resistant polyester film, the UV-resistant material comprises 1-5% of ultraviolet absorbent and 1-5% of light stabilizer, and compared with the common polyester film, the absorption peak in an ultraviolet band is obviously improved; the transmittance is less than 10% at the ultraviolet 380nm position; after irradiation for 200kwh, the yellowing is less than or equal to 3; after PCT48h, the breaking elongation retention rate is more than or equal to 40 percent;
2. the anti-UV polyester film also comprises an anti-aging layer, wherein the anti-aging layer is made of 100 parts by weight of butylene terephthalate and a butylene terephthalate copolymer, 40-50 parts by weight of polylactic acid, 55-65 parts by weight of nano calcium carbonate and 0.8-1.2 parts by weight of erucamide, and the anti-aging layer made of the anti-aging layer is suitable for the use environment of a solar backboard, so that the anti-aging effect of a product is greatly improved, the service life of the film is prolonged, the anti-UV polyester film is strong in usability and simple in structure;
3. the anti-UV polyester film further comprises an adhesive, wherein the adhesive comprises MDI 20-25%, polypropylene oxide 20-25%, methyl isobutyl ketone 6-10%, propylene glycol methyl ether acetate 10-15%, phenolic resin 3-5%, acetone 3-5%, ethylbenzene 5-10% and the balance of xylene, so that the adhesive effect is improved, the practicability is high, the bonding effect on the back plate is ensured, and the product protection is improved;
4. through still including ultraviolet absorber and light stabilizer with the gluing agent, ultraviolet absorber and light stabilizer pass through the ultrasonic wave dispersion in the gluing agent, carry out dispersion treatment with ultraviolet absorber and light stabilizer through adopting the ultrasonic wave, are for improving the anti ultraviolet effect of gluing agent on the one hand, prevent adhesive failure, and on the other hand has then formed the effect of second way anti ultraviolet, and the practicality is strong, and anti ultraviolet ability is showing and is promoting.
A preparation method of the transparent UV-resistant polyester film suitable for the backboard comprises the following steps of (1) mixing: 26-29 parts of polyethylene terephthalate, 22-27 parts of polybutylene terephthalate, 18-23 parts of polydiallyl terephthalate, 4-9 parts of vinyl acetate, 6-8 parts of gluconolactone and 7-10 parts of isoamyl acetate; the anti-UV polyester film is also added with an anti-UV material, wherein the anti-UV material comprises 1-5% of an ultraviolet absorbent and 1-5% of a light stabilizer, and is fully mixed by a mixing kettle, and the stirring temperature is 300-350 ℃;
(2) melt extrusion: the temperature of the preheating section of the extruder is controlled to be 260-270 ℃, the temperature of the melting section is controlled to be 275-290 ℃, the polyester melt is extruded out from the die head through a metering pump, a filter and a melt line, and the extrusion speed is controlled to be 36-40 r/min;
(3) casting a sheet: cooling the polyester melt by a cold drum with the surface temperature of 25-30 ℃, and forming a casting sheet with the crystallinity of less than 3 percent by a high-voltage electrostatic film attaching system;
(4) longitudinal stretching: preheating a cast sheet, and longitudinally stretching, wherein the stretching temperature is controlled to be 78-85 ℃, and the cooling temperature is controlled to be 25-40 ℃;
(5) and (3) transverse stretching: preheating the longitudinally stretched cast sheet, transversely stretching the longitudinally stretched cast sheet, controlling the stretching temperature to be 115-130 ℃, gradually cooling the longitudinally stretched cast sheet to normal temperature after heat setting, and controlling the crystallinity of the polyester film to be more than 50%;
(6) gluing: adding an ultraviolet absorber and a light stabilizer into an adhesive, stirring by using a stirrer, fully dispersing the ultraviolet absorber and the light stabilizer into the adhesive by using ultrasonic waves, treating the ultraviolet absorber and the light stabilizer for 10-20 min by using the ultrasonic waves, coating the treated adhesive on the lower surface of a polyester film, and baking the adhesive to form an adhesive layer;
(7) traction and winding: rolling in a contact mode, wherein the rolling pressure ratio is controlled to be 20-30%, and the tension ratio is controlled to be 70-80%; and controlling the air cleanliness of a workshop to reach below ten thousand levels in the manufacturing process.
The invention is further configured to: the extruder comprises a discharge end and a heating temperature control device arranged outside the discharge end, wherein the heating temperature control device mainly comprises a feedback circuit, a sleeve and a heater positioned in the sleeve, the heater is formed by connecting a plurality of sleeve-shaped heat pipes through a connecting piece, each sleeve-shaped heat pipe comprises an inner pipe and an outer pipe, and a vacuum gap structure filled with working media is arranged between each inner pipe and each outer pipe.
The invention is further configured to: the heater is connected with a temperature controller, one output end of the heater is electrically connected with the heater through an adjustable transformer by a cable, the other output end of the heater is electrically connected with a thermocouple contacted with the heater by a cable, so that a feedback circuit is formed, a temperature monitor is arranged between the outer wall of the discharge end and the inner pipe, and the temperature monitor is electrically connected with the temperature controller.
The invention is further configured to: the temperature of the heater is controlled between 260 ℃ and 270 ℃.
The invention is further configured to: the baking temperature of the adhesive is between 40 and 50 ℃.
By adopting the technical scheme, the preparation of the anti-UV polyester film is completed by mixing and stirring materials → melt extrusion → casting sheet → longitudinal stretching → transverse stretching → gluing → traction rolling, the forming effect is good, and the stability of the anti-UV polyester film is improved;
and through the heating temperature regulating device who sets up, to forming the effect of heating when extruding, control is in suitable stability, has guaranteed the viscosity of extruder discharge end, has reduced the influence of the difference in temperature, has improved good shaping effect, and stability is strong, simple structure.
Drawings
FIG. 1 is a process flow diagram of an embodiment of a transparent UV resistant polyester film for a back plate and a preparation method thereof.
FIG. 2 is a structural diagram of an extruder for an embodiment of a transparent UV resistant polyester film for a back sheet and a method for preparing the same according to the present invention.
Fig. 3 is a structural diagram of a sleeve-shaped heat pipe in an embodiment of a transparent UV-resistant polyester film for a back plate and a preparation method thereof of the invention.
Reference numeral in the figure, 1, extruder; 2. a discharge end; 30. a sleeve; 31. a heater; 32. a sleeve-shaped heat pipe; 320. an inner tube; 321. an outer tube; 322. and a vacuum gap structure.
Detailed Description
Embodiments of a transparent UV-resistant polyester film for a back sheet and a method for preparing the same according to the present invention are further described with reference to fig. 1 to 3.
For ease of description, spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
A transparent anti-UV polyester film for a backboard comprises the following components in parts by weight: 26-29 parts of polyethylene terephthalate, 22-27 parts of polybutylene terephthalate, 18-23 parts of polydiallyl terephthalate, 4-9 parts of vinyl acetate, 6-8 parts of gluconolactone and 7-10 parts of isoamyl acetate; the anti-UV polyester film is also added with an anti-UV material, the anti-UV material comprises 1-5% of an ultraviolet absorbent and 1-5% of a light stabilizer, the anti-UV material is also added into the anti-UV polyester film, the anti-UV material comprises 1-5% of the ultraviolet absorbent and 1-5% of the light stabilizer, and compared with the common polyester film, the absorption peak at the ultraviolet band is obviously improved; the transmittance is less than 10% at the ultraviolet 380nm position; after irradiation for 200kwh, the yellowing is less than or equal to 3; after PCT48h, the breaking elongation retention rate is more than or equal to 40 percent;
the invention is further set that the ultraviolet absorbent comprises one or more of salicylic acid ester, benzophenone, benzotriazole, benzoate and other organic compounds; the light stabilizer comprises one or more of NBC770, 2002, 1084 and the like.
The anti-UV polyester film further comprises an anti-aging layer, wherein the anti-aging layer is made of 100 parts by weight of butylene terephthalate and a butylene terephthalate copolymer, 40-50 parts by weight of polylactic acid, 55-65 parts by weight of nano calcium carbonate and 0.8-1.2 parts by weight of erucamide, and the anti-aging layer made of the anti-aging layer is suitable for the use environment of a solar backboard, so that the anti-aging effect of the product is greatly improved, the service life of the film is prolonged, and the anti-UV polyester film is strong in usability and simple in structure.
The invention is further configured to: the anti-UV polyester film further comprises an adhesive, wherein the adhesive comprises MDI 20-25%, polypropylene oxide 20-25%, methyl isobutyl ketone 6-10%, propylene glycol methyl ether acetate 10-15%, phenolic resin 3-5%, acetone 3-5%, ethylbenzene 5-10% and the balance of xylene, and the adhesive comprises MDI 20-25%, polypropylene oxide 20-25%, methyl isobutyl ketone 6-10%, propylene glycol methyl ether acetate 10-15%, phenolic resin 3-5%, acetone 3-5%, ethylbenzene 5-10% and the balance of xylene, so that the adhesive effect is improved, the practicability is high, the bonding effect on a back plate is ensured, and the protection on a product is improved;
the invention is further configured to: the adhesive further comprises an ultraviolet absorber and a light stabilizer, the ultraviolet absorber and the light stabilizer are dispersed in the adhesive through ultrasonic waves, the adhesive further comprises the ultraviolet absorber and the light stabilizer, the ultraviolet absorber and the light stabilizer are dispersed in the adhesive through the ultrasonic waves, and the ultraviolet absorber and the light stabilizer are dispersed through the ultrasonic waves, so that on one hand, the ultraviolet-resistant effect of the adhesive is improved, the failure of adhesion is prevented, on the other hand, the second ultraviolet-resistant effect is formed, the practicability is high, and the ultraviolet-resistant capability is remarkably improved.
A preparation method of the transparent UV-resistant polyester film suitable for the backboard comprises the following steps of (1) mixing: 26-29 parts of polyethylene terephthalate, 22-27 parts of polybutylene terephthalate, 18-23 parts of polydiallyl terephthalate, 4-9 parts of vinyl acetate, 6-8 parts of gluconolactone and 7-10 parts of isoamyl acetate; the anti-UV polyester film is also added with an anti-UV material, the anti-UV material comprises 1-5% of an ultraviolet absorbent and 1-5% of a light stabilizer, the materials are fully mixed through a mixing kettle, the stirring temperature is 300-350 ℃, the mixing effect is improved, the practicability is high, and the uniformity degree of the product after production is ensured;
(2) melt extrusion: the temperature of the preheating section of the extruder is controlled to be 260-270 ℃, the temperature of the melting section is controlled to be 275-290 ℃, the polyester melt is extruded out from the die head through a metering pump, a filter and a melt line, and the extrusion speed is controlled to be 36-40 r/min; the discharging is stabilized, the control on materials is improved, the forming effect on the film is ensured, the practicability is high, and the structure is simple;
(3) casting a sheet: cooling the polyester melt by a cold drum with the surface temperature of 25-30 ℃, and forming a casting sheet with the crystallinity of less than 3 percent by a high-voltage electrostatic film attaching system;
(4) longitudinal stretching: preheating a cast sheet, and longitudinally stretching, wherein the stretching temperature is controlled to be 78-85 ℃, and the cooling temperature is controlled to be 25-40 ℃;
(5) and (3) transverse stretching: preheating the longitudinally stretched cast sheet, transversely stretching the longitudinally stretched cast sheet, controlling the stretching temperature to be 115-130 ℃, gradually cooling the longitudinally stretched cast sheet to normal temperature after heat setting, and controlling the crystallinity of the polyester film to be more than 50%;
(6) gluing: adding an ultraviolet absorber and a light stabilizer into an adhesive, stirring by using a stirrer, fully dispersing the ultraviolet absorber and the light stabilizer into the adhesive by using ultrasonic waves, treating the ultraviolet absorber and the light stabilizer for 10-20 min by using the ultrasonic waves, coating the treated adhesive on the lower surface of a polyester film, and baking the adhesive to form an adhesive layer;
(7) traction and winding: rolling in a contact mode, wherein the rolling pressure ratio is controlled to be 20-30%, and the tension ratio is controlled to be 70-80%; and controlling the air cleanliness of a workshop to reach below ten thousand levels in the manufacturing process.
The extruder 1 further comprises a discharge end 2 and a heating temperature control device arranged outside the discharge end 2, the temperature difference is reduced through the arranged heating temperature control device, the product forming effect is improved, and the practicability is improved.
The present invention is further configured such that the heater 31 is connected to a temperature controller, one output terminal of which is electrically connected to the heater 31 through an adjustable transformer by a cable, and the other output terminal of which is electrically connected to a thermocouple in contact with the heater 31 by a cable, thereby forming a feedback circuit, and a temperature monitor is provided between the outer wall of the discharge end 2 and the inner tube 320, and the temperature monitor is electrically connected to the temperature controller.
The invention is further set that the temperature of the heater 31 is controlled between 260 ℃ and 270 ℃, the temperature range is adopted, the temperature difference is reduced, the stretching forming effect is improved, the uniformity and the tensile strength can be improved, the practicability is high, and the structure is simple.
The invention is further set that the baking temperature for baking the adhesive is between 40 and 50 ℃.
By adopting the technical scheme, the preparation of the anti-UV polyester film is completed by mixing and stirring materials → melt extrusion → casting sheet → longitudinal stretching → transverse stretching → gluing → traction rolling, the forming effect is good, and the stability of the anti-UV polyester film is improved;
and through the heating temperature regulating device who sets up, to forming the effect of heating when extruding, control is in suitable stability, has guaranteed the viscosity of extruder discharge end, has reduced the influence of the difference in temperature, has improved good shaping effect, and stability is strong, simple structure.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art should be able to make general changes and substitutions within the technical scope of the present invention.
Claims (10)
1. The transparent anti-UV polyester film for the back plate is characterized by comprising the following components in parts by weight: 26-29 parts of polyethylene terephthalate, 22-27 parts of polybutylene terephthalate, 18-23 parts of polydiallyl terephthalate, 4-9 parts of vinyl acetate, 6-8 parts of gluconolactone and 7-10 parts of isoamyl acetate; the anti-UV polyester film is further added with an anti-UV material, wherein the anti-UV material comprises 1% -5% of an ultraviolet absorbent and 1% -5% of a light stabilizer.
2. The transparent UV-resistant polyester film for back sheets as claimed in claim 1, wherein the UV absorber comprises one or more compounds selected from salicylic acid esters, benzophenones, benzotriazoles and benzoic acid esters; the light stabilizer comprises one or more of NBC770, 2002, 1084 and the like.
3. The transparent UV-resistant polyester film for the back sheet as claimed in claim 1, further comprising an anti-aging layer, wherein the anti-aging layer is made of 100 parts by weight of butylene terephthalate and butylene terephthalate copolymer, 40-50 parts by weight of polylactic acid, 55-65 parts by weight of nano calcium carbonate, and 0.8-1.2 parts by weight of erucamide.
4. The transparent anti-UV polyester film for the back plate as claimed in claim 1, further comprising an adhesive, wherein the adhesive comprises 20-25% of MDI, 20-25% of polypropylene oxide, 6-10% of methyl isobutyl ketone, 10-15% of propylene glycol methyl ether acetate, 3-5% of phenolic resin, 3-5% of acetone, 5-10% of ethylbenzene and the balance of xylene.
5. The transparent UV-resistant polyester film for the back sheet according to claim 1, wherein the adhesive further comprises an ultraviolet absorber and a light stabilizer, and the ultraviolet absorber and the light stabilizer are dispersed in the adhesive by ultrasonic waves.
6. A method for preparing a transparent UV resistant polyester film suitable for use in the backsheet of claim 1, comprising the steps of (1) mixing: 26-29 parts of polyethylene terephthalate, 22-27 parts of polybutylene terephthalate, 18-23 parts of polydiallyl terephthalate, 4-9 parts of vinyl acetate, 6-8 parts of gluconolactone and 7-10 parts of isoamyl acetate; the anti-UV polyester film is also added with an anti-UV material, wherein the anti-UV material comprises 1-5% of an ultraviolet absorbent and 1-5% of a light stabilizer, and is fully mixed by a mixing kettle, and the stirring temperature is 300-350 ℃;
(2) melt extrusion: the temperature of the preheating section of the extruder is controlled to be 260-270 ℃, the temperature of the melting section is controlled to be 275-290 ℃, the polyester melt is extruded out from the die head through a metering pump, a filter and a melt line, and the extrusion speed is controlled to be 36-40 r/min;
(3) casting a sheet: cooling the polyester melt by a cold drum with the surface temperature of 25-30 ℃, and forming a casting sheet with the crystallinity of less than 3 percent by a high-voltage electrostatic film attaching system;
(4) longitudinal stretching: preheating a cast sheet, and longitudinally stretching, wherein the stretching temperature is controlled to be 78-85 ℃, and the cooling temperature is controlled to be 25-40 ℃;
(5) and (3) transverse stretching: preheating the longitudinally stretched cast sheet, transversely stretching the longitudinally stretched cast sheet, controlling the stretching temperature to be 115-130 ℃, gradually cooling the longitudinally stretched cast sheet to normal temperature after heat setting, and controlling the crystallinity of the polyester film to be more than 50%;
(6) gluing: adding an ultraviolet absorber and a light stabilizer into an adhesive, stirring by using a stirrer, fully dispersing the ultraviolet absorber and the light stabilizer into the adhesive by using ultrasonic waves, treating the ultraviolet absorber and the light stabilizer for 10-20 min by using the ultrasonic waves, coating the treated adhesive on the lower surface of a polyester film, and baking the adhesive to form an adhesive layer;
(7) traction and winding: rolling in a contact mode, wherein the rolling pressure ratio is controlled to be 20-30%, and the tension ratio is controlled to be 70-80%; and controlling the air cleanliness of a workshop to reach below ten thousand levels in the manufacturing process.
7. The method for preparing the transparent anti-UV polyester film for the back plate according to claim 6, wherein the extruder comprises a discharge end and a heating temperature control device arranged outside the discharge end, the heating temperature control device mainly comprises a feedback circuit, a sleeve and a heater positioned in the sleeve, the heater is formed by connecting a plurality of sleeve-shaped heat pipes through connecting pieces, each sleeve-shaped heat pipe comprises an inner pipe and an outer pipe, and a vacuum gap structure filled with working media is arranged between the inner pipe and the outer pipe.
8. The method of claim 6, wherein the heater is connected to a temperature controller, one output terminal of the heater is electrically connected to the heater through a cable via a variable transformer, and the other output terminal of the heater is electrically connected to a thermocouple in contact with the heater through a cable, thereby forming a feedback circuit, and a temperature monitor is disposed between the outer wall of the discharge terminal and the inner tube, and the temperature monitor is electrically connected to the temperature controller.
9. The method for preparing a transparent anti-UV polyester film for a back plate as claimed in claim 8, wherein the temperature of the heater is controlled to be between 260 ℃ and 270 ℃.
10. The method for preparing the transparent anti-UV polyester film for the back plate as claimed in claim 6, wherein the baking temperature for baking the adhesive is between 40 ℃ and 50 ℃.
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| CN114953687A (en) * | 2022-05-11 | 2022-08-30 | 江苏邦宇薄膜技术有限公司 | Online coated uvioresistant polyester film and preparation method thereof |
| JP7466616B2 (en) | 2020-12-22 | 2024-04-12 | 南亞塑膠工業股▲分▼有限公司 | Manufacturing method of biaxially oriented polyester film |
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