CN111961243A - Colorless treatment method for yellow transparent polyimide film and colorless composite film - Google Patents
Colorless treatment method for yellow transparent polyimide film and colorless composite film Download PDFInfo
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- CN111961243A CN111961243A CN202010693016.0A CN202010693016A CN111961243A CN 111961243 A CN111961243 A CN 111961243A CN 202010693016 A CN202010693016 A CN 202010693016A CN 111961243 A CN111961243 A CN 111961243A
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- 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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- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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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
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
- C08J2475/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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Abstract
The invention relates to a processing method for colorless yellow transparent polyimide film, which comprises the following steps: coating a layer of blue transparent hardened layer coating on the surface of the transparent polyimide film with the first yellowing degree, and curing to obtain a surface-hardened transparent polyimide composite film with the second yellowing degree; wherein the second degree of yellowing is less than the first degree of yellowing. According to the invention, the blue transparent hardened layer is introduced to the surface of the yellow common transparent polyimide film, so that the blue transparent hardened layer and the transparent polyimide film are subjected to optical compensation, and the hardened colorless (the yellowing degree is reduced to be colorless by naked eyes) transparent polyimide film is obtained under the condition of no reduction of transmittance, so that the threshold of the application of the polyimide on the flexible cover plate is greatly reduced.
Description
Technical Field
The invention relates to the technical field of transparent polyimide film protective films, in particular to a treatment method for colorless yellow transparent polyimide film and a colorless composite film.
Background
In the application of cover plates (or flexible cover plates) of mobile phones, digital cameras, computers, televisions and the like, the application requirement of polyimide is that the polyimide is colorless (the yellowing degree b of the representative material is less than or equal to 1), so that the requirement on polyimide monomers is higher, and fluorinated monomers or esterified monomers are required. Therefore, the technology of colorless and transparent polyimide films is mastered by a few manufacturers who have special monomers for synthesis.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a method for processing yellow transparent polyimide film to be colorless, which comprises adding a blue transparent hardened layer on the surface of the yellow transparent polyimide film, and optically compensating with the yellow polyimide film, so as to obtain a hardened transparent polyimide film with reduced yellowing degree without significantly reducing light transmittance, thereby greatly reducing the threshold of the application of the polyimide film on a flexible cover plate.
The invention also relates to a colorless composite film comprising a hardened transparent polyimide.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in one aspect, an embodiment of the present invention provides a processing method for colorless yellow transparent polyimide film, where the processing method includes: coating a layer of blue transparent hardened layer coating on the surface of the transparent polyimide film with the first yellowing degree, and curing to obtain a surface-hardened transparent polyimide composite film with the second yellowing degree; wherein the second degree of yellowing is less than the first degree of yellowing.
According to a preferred embodiment of the present invention, the yellowing b value of the transparent polyimide film of the first yellowing degree is 0.8 to 2.6; the second degree of yellowing has a b value of 0.2 to 0.6.
According to a preferred embodiment of the present invention, the blue transparent hardened layer coating comprises the following components:
10-30 parts of polyurethane acrylic prepolymer, 20-50 parts of reactive diluent, 15-35 parts of diluent and photoinitiator: 1-5 parts by mass, 1-10 parts by mass of blue pigment and 0.1-1 part by mass of leveling agent;
and wherein the specific amount of the blue colorant correlates with the magnitude of the first yellowing b value of the transparent polyimide film; the greater the value of the first yellowing degree b, the higher the amount of the blue coloring material used; otherwise, the smaller.
According to a preferred embodiment of the invention, the preparation method of the blue transparent hardened layer coating comprises the following steps:
s1, adding 20-50 parts by mass of multifunctional acrylate serving as a reactive diluent and 15-35 parts by mass of monoacetate serving as a diluent into a reaction container according to the mixture ratio, and uniformly stirring at room temperature;
s2, adding 10-30 parts by mass of polyurethane acrylic prepolymer into the reaction vessel according to the proportion, and continuously stirring at room temperature;
s3, adding 1-5 parts by mass of photoinitiator into the reaction vessel according to the mixture ratio, and continuously stirring at room temperature;
s4, adding 1-10 parts by mass of blue pigment and 0.1-1 part by mass of leveling agent into the reaction container according to the mixture ratio, and stirring at room temperature until the mixture is uniform;
and S5, filtering the mixed solution obtained by stirring through a filter bag with the diameter of 5-15 mu m, and obtaining filtrate, namely the blue transparent hardened layer paint.
According to a preferred embodiment of the present invention, the reactive diluent is a multifunctional acrylate, and the diluent is propylene glycol monoacetate; the leveling agent is one or a mixture of more of AMS-2020, Tego-270, RM-2020, Tego-100 and HTK-3020.
According to a preferred embodiment of the present invention, the preparation method of the urethane acrylate prepolymer comprises: and reacting the polyester polyol/polyether polyol with diisocyanate to prepare a polyurethane prepolymer, and reacting the polyurethane prepolymer with an acrylate compound to prepare the polyurethane acrylate prepolymer.
According to a preferred embodiment of the present invention, the multifunctional acrylate is one of BDDA and HDDA, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, 4-hydroxybutyl acrylate, hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 2- (4-benzoyl-3-hydroxyphenoxy) ethyl 2-acrylate, propyl 2, 3-dihydroxymethacrylate and hydroxypropyl acrylate;
according to a preferred embodiment of the invention, the blue pigment is one or more of Olive blue, Gong blue, reactive brilliant blue KN-R and reactive blue B-RV.
According to a preferred embodiment of the invention, said blue colorant is orlistat blue; when the first yellowing degree b is 0.8-1, the using amount of the orlistat blue in the blue transparent hardened layer coating is 0.5-0.8 parts by mass; when the first yellowing degree b is 1.5-2, the using amount of the orlistat blue in the blue transparent hardened layer coating is 2.5-3.5 parts by mass; and when the first yellowing degree b is 2.5-3, the amount of the Olive blue in the blue transparent hardened layer coating is 5-6 parts by mass.
According to the preferred embodiment of the present invention, the processing method comprises:
the method comprises the following steps: preparing the blue transparent hardened layer coating according to the method;
step two: coating the blue transparent hardened layer coating on the surface of the transparent polyimide film with a first yellowing degree, and primarily drying the blue transparent hardened layer coating;
step three: irradiating with high-pressure mercury lamp with irradiation energy of 500-2And the blue transparent hardened layer coating is quickly cured under the action of ultraviolet ray irradiation and an initiator, and forms physical connection and chemical bond connection with the transparent polyimide film to prepare the transparent polyimide composite film with the hardened surface and colorless or low yellowing degree.
The coating method comprises one or more of spin coating, wire bar blade coating, curtain coating and spray coating.
And the primary drying mode is to bake the uniformly coated sample in an oven at 80 ℃ for 1-5 min.
Wherein, become blue transparent sclerosis layer after blue transparent sclerosis layer coating solidification, the thickness of blue transparent sclerosis layer is 1-10 μm.
In another aspect, the present invention provides a colorless composite film, comprising a yellow transparent polyimide film and a blue transparent hardened layer located on the surface of the transparent polyimide film, wherein the yellowing degree b of the blue transparent hardened layer is less than 0; the blue transparent hardened layer and the transparent polyimide are subjected to optical compensation, and the hardened transparent polyimide colorless composite film is obtained under the condition that the light transmittance is not obviously reduced.
Preferably, the yellow transparent polyimide film has a yellowing degree b value of more than 0.8 and less than 3; the yellowing degree b value of the transparent polyimide colorless composite film is less than 0.6.
In the present application: b represents the degree of yellowing of the material: b > 0, the larger the color, the more yellow; b < 0, the smaller the color, the more blue.
The hardened transparent polyimide colorless composite film prepared by the invention can be used as a protective film of a screen of electronic equipment or a flexible electronic cover plate of the electronic equipment.
(III) advantageous effects
(1) According to the invention, the blue transparent hardened layer is introduced to the surface of the yellow common transparent polyimide film, so that the blue transparent hardened layer and the transparent polyimide film are subjected to optical compensation, and the hardened colorless (the yellowing degree is reduced to be colorless by naked eyes) transparent polyimide film is obtained under the condition of no reduction of transmittance, so that the threshold of the application of the polyimide on the flexible cover plate is greatly reduced.
(2) The colorless composite film obtained by the method comprises a yellow transparent polyimide film and a blue transparent hardened layer positioned on the surface of the transparent polyimide film, has the advantages of aging resistance, high temperature resistance, corrosion resistance, moisture resistance, scratch resistance and the like, and can be used as a protective film of a screen of electronic equipment or a flexible electronic cover plate of the electronic equipment with excellent properties.
Drawings
FIG. 1 is a schematic structural diagram of a colorless composite film according to the present invention.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
The embodiment of the invention provides that a blue transparent hardened layer is introduced to the surface of a yellow common transparent polyimide film, so that the blue transparent hardened layer and the transparent polyimide film are subjected to optical compensation, and the hardened colorless (the yellowing degree is reduced to be colorless when observed by naked eyes) transparent polyimide film is obtained under the condition of no reduction of transmittance, so that the threshold of the application of polyimide on a flexible cover plate is greatly reduced.
As shown in fig. 1, a schematic structural diagram of the colorless composite film of the present invention includes: the transparent polyimide film of yellow 10 and the transparent sclerosis layer of blue 20 that is located this transparent polyimide film 10 surface, the transparent sclerosis layer of blue adopts the coating mode to form. The yellowing b value of the blue transparent hardened layer 20 is less than 0. The blue transparent hardened layer 20 and the transparent polyimide 10 (the yellowing degree b is larger than 0) are optically compensated, and the hardened transparent polyimide colorless composite film is obtained under the condition of not obviously reducing the light transmittance. Preferably, the yellow transparent polyimide film 10 has a b value of greater than 0.8 and less than 3, and the finally prepared transparent polyimide colorless composite film has a b value of < 0.6.
For a better understanding of the above technical solutions, the following will be combined with exemplary embodiments of the present invention. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
(1): a yellowish transparent polyimide film having a yellowing b value of 0.86 and a thickness of 20 μm was purchased from a manufacturer.
(2): preparing blue transparent hardened layer coating, which comprises the following steps:
the method comprises the following steps: adding 45 parts by mass of active diluent BDDA and 30 parts by mass of diluent acrylate monoacetate into a stirring kettle, and stirring at room temperature at 300rpm for 10 min.
Secondly, the step of: according to the proportion, 25 parts by mass of polyurethane acrylic prepolymer is added into the stirring kettle, and the stirring is carried out at room temperature at 500rpm for 2 hours.
In this example, the urethane acrylate prepolymer was prepared as follows:
diisocyanate and polyester polyol are respectively dissolved in a polar solvent to respectively obtain a diisocyanate solution and a polyester polyol solution, and the mass concentration of the diisocyanate solution and the polyester polyol solution is controlled to be 10-30%. Adding a diisocyanate solution into a polyester polyol solution at the temperature of 30-100 ℃ under a protective atmosphere while stirring, wherein the molar ratio of isocyanate groups of diisocyanate to hydroxyl groups of polyester polyol is 9: 8-3: 1; after the diisocyanate is added, the reaction system is subjected to heat preservation reaction for 10-30 h; then adding a protective agent into the reaction system, and continuing to react for 5-10h at the temperature of 30-100 ℃ to obtain the polyurethane prepolymer.
③: according to the proportion, 3 parts by mass of photoinitiator is added into the stirring kettle, and the stirring is carried out at the room temperature of 500rpm for 0.5 hour.
Fourthly, the method comprises the following steps: adding 0.5 part by mass of the Olive blue and 0.5 part by mass of the flatting agent AMS-2020 into the stirring kettle according to the proportion, and stirring for 2 hours at room temperature at 1000 rpm.
Fifthly: and filtering the mixed solution obtained by stirring through a 10-micron filter screen bag to obtain filtrate, namely the blue transparent hardened layer coating.
(3): the blue transparent hardened layer coating is uniformly sprayed on the surface of a yellow transparent polyimide film, and the uniformly coated sample is placed into an oven at 80 ℃ to be baked for 3 min.
(4): irradiating with high-pressure mercury lamp at an irradiation energy of 800mJ/cm2The blue transparent hardened layer coating is quickly cured into a blue transparent hardened layer under the action of ultraviolet ray irradiation and an initiator, the thickness of the blue transparent hardened layer is 5 mu m, physical connection and chemical bond connection are formed between the blue transparent hardened layer and the yellow transparent polyimide film at the bottom, the transparent polyimide composite film with the surface hardened, colorless or low yellowing degree is prepared, and the yellowing degree b value is measured to be 0.35.
The yellowing value b of the transparent material is determined by the following method: b is a value from blue to yellow (negative to positive) expressed in the CIE 1976 standard, the test instrument is Cary 300 (with integrating sphere), the light source is D65, measured in transmission mode.
Example 2
(1): a yellowish transparent polyimide film was purchased from a manufacturer, and the degree of yellowing b was 1.68, the thickness was 20 μm, and the light transmittance was 91.5%.
(2): preparing blue transparent hardened layer coating, which comprises the following steps:
the method comprises the following steps: adding 40 parts by mass of active diluent HDDA and 25 parts by mass of diluent acrylate monoacetate into a stirring kettle, and stirring at 200rpm for 10min at room temperature.
Secondly, the step of: according to the proportion, 20 parts by mass of polyurethane acrylic prepolymer is added into the stirring kettle, and the stirring is carried out for 2 hours at room temperature at 400 rpm.
In this example, the urethane acrylate prepolymer preparation method may be as described above.
③: according to the proportion, 2 parts by mass of photoinitiator is added into the stirring kettle, and the stirring is carried out at room temperature and 500rpm for 0.5 hour.
Fourthly, the method comprises the following steps: adding 3 parts by mass of the Olive blue and 0.5 part by mass of the flatting agent Tego-270 into the stirring kettle according to the mixture ratio, and stirring at 800rpm for 2 hours at room temperature.
Fifthly: and filtering the mixed solution obtained by stirring through a 10-micron filter screen bag to obtain filtrate, namely the blue transparent hardened layer coating.
(3): the blue transparent hardened layer coating is uniformly sprayed on the surface of a yellow transparent polyimide film, and the uniformly coated sample is placed into an oven at 80 ℃ to be baked for 3 min.
(4): irradiating with high-pressure mercury lamp at an irradiation energy of 1000mJ/cm2The blue transparent hardened layer coating is quickly cured into a blue transparent hardened layer under the action of ultraviolet ray irradiation and an initiator, the thickness of the blue transparent hardened layer is 10 mu m, physical connection and chemical bond connection are formed between the blue transparent hardened layer and the yellow transparent polyimide film at the bottom, the transparent polyimide composite film with the surface hardened, colorless or low yellowing degree is prepared, and the yellowing degree b value is measured to be 0.24. Further, the light transmittance of the transparent polyimide composite film was measured to be 91.0%. The light transmittance was reduced by only 0.05% and the yellowing b value was reduced by 1.44, compared to a yellow transparent polyimide film.
It is thus seen that both the blue transparent hardened layer and the yellow transparent polyimide can be optically compensated to obtain a composite film in which the hardened transparent polyimide is nearly colorless (b ═ 0.24) without significantly decreasing the light transmittance.
Example 3
(1): a yellowish transparent polyimide film having a yellowing b value of 2.57 and a thickness of 20 μm was purchased from a manufacturer.
(2): preparing blue transparent hardened layer coating, which comprises the following steps:
the method comprises the following steps: 50 parts by mass of HDDA serving as an active diluent and 35 parts by mass of acrylate monoacetate serving as a diluent are added into a stirring kettle and stirred at the room temperature at 300rpm for 10 min.
Secondly, the step of: according to the proportion, 30 parts by mass of polyurethane acrylic prepolymer is added into the stirring kettle, and the stirring is carried out for 2 hours at room temperature at 500 rpm.
In this example, the urethane acrylate prepolymer preparation method may be as described above.
③: according to the proportion, 4.5 parts by mass of photoinitiator is added into the stirring kettle, and the stirring is carried out at the room temperature of 500rpm for 0.5 hour.
Fourthly, the method comprises the following steps: adding 5 parts by mass of the Olive blue and 0.6 part by mass of the flatting agent Tego-100 into the stirring kettle according to the mixture ratio, and stirring at 800rpm for 2 hours at room temperature.
Fifthly: and filtering the mixed solution obtained by stirring through a 10-micron filter screen bag to obtain filtrate, namely the blue transparent hardened layer coating.
(3): and uniformly spraying the blue transparent hardened layer coating on the surface of the yellow transparent polyimide film, and putting the uniformly coated sample into an oven at 80 ℃ for baking for 5 min.
(4): irradiating with high-pressure mercury lamp at an irradiation energy of 900mJ/cm2The blue transparent hardened layer coating is quickly solidified into a blue transparent hardened layer under the action of ultraviolet ray irradiation and an initiator, the thickness of the blue transparent hardened layer is 10 mu m, the blue transparent hardened layer and the yellow transparent polyimide film at the bottom form physical connection and chemical bond connection to prepare the transparent polyimide composite film with the hardened surface, no color or low yellowing degree, the yellowing degree b is measured to be 0.56, and the requirement of less than 1 is metAnd (5) application requirements.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A processing method for colorless yellow transparent polyimide film is characterized by comprising the following steps: coating a layer of blue transparent hardened layer coating on the surface of the transparent polyimide film with the first yellowing degree, and curing to obtain a surface-hardened transparent polyimide composite film with the second yellowing degree; wherein the second degree of yellowing is less than the first degree of yellowing.
2. The process of claim 1, wherein the first yellowing transparent polyimide film has a b value of 0.8 to 2.6; the second degree of yellowing has a b value of 0.2 to 0.6.
3. The method of claim 1, wherein the blue transparent hardened layer coating comprises the following components:
10-30 parts of polyurethane acrylic prepolymer, 20-50 parts of reactive diluent, 15-35 parts of diluent and photoinitiator: 1-5 parts by mass, 1-10 parts by mass of blue pigment and 0.1-1 part by mass of leveling agent;
and wherein the specific amount of the blue colorant correlates with the magnitude of the first yellowing b value of the transparent polyimide film; the greater the value of the first yellowing degree b, the higher the amount of the blue coloring material used; otherwise, the smaller.
4. The processing method according to claim 3, wherein the blue transparent hardened layer coating is prepared by:
s1, adding 20-50 parts by mass of multifunctional acrylate serving as a reactive diluent and 15-35 parts by mass of monoacetate serving as a diluent into a reaction container according to the mixture ratio, and uniformly stirring at room temperature;
s2, adding 10-30 parts by mass of polyurethane acrylic prepolymer into the reaction vessel according to the proportion, and continuously stirring at room temperature;
s3, adding 1-5 parts by mass of photoinitiator into the reaction vessel according to the mixture ratio, and continuously stirring at room temperature;
s4, adding 1-10 parts by mass of blue pigment and 0.1-1 part by mass of leveling agent into the reaction container according to the mixture ratio, and stirring at room temperature until the mixture is uniform;
and S5, filtering the mixed solution obtained by stirring through a filter bag with the diameter of 5-15 mu m, and obtaining filtrate, namely the blue transparent hardened layer paint.
5. The processing method according to claim 3 or 4,
the active diluent is multifunctional acrylate, and the diluent is propylene glycol monoacetate; the leveling agent is one or a mixture of more of AMS-2020, Tego-270, RM-2020, Tego-100 and HTK-3020;
the preparation method of the polyurethane acrylate prepolymer comprises the following steps: reacting the polyester polyol/polyether polyol with diisocyanate to prepare a polyurethane prepolymer, and reacting the polyurethane prepolymer with an acrylate compound to prepare the polyurethane acrylate prepolymer;
the multifunctional acrylate is one of BDDA and HDDA, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, 4-hydroxybutyl acrylate, hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 2- (4-benzoyl-3-hydroxyphenoxy) ethyl 2-acrylate, 2, 3-dihydroxypropyl methacrylate and hydroxypropyl acrylate.
6. The treatment method according to claim 3 or 4, wherein the blue colorant is one or more of Olivine blue, Gong blue, reactive brilliant blue KN-R, and reactive blue B-RV.
7. The treatment process according to claim 3 or 4, characterized in that the blue colorant is orlistat blue; when the first yellowing degree b is 0.8-1, the using amount of the orlistat blue in the blue transparent hardened layer coating is 0.5-0.8 parts by mass; when the first yellowing degree b is 1.5-2, the using amount of the orlistat blue in the blue transparent hardened layer coating is 2.5-3.5 parts by mass; and when the first yellowing degree b is 2.5-3, the amount of the Olive blue in the blue transparent hardened layer coating is 5-6 parts by mass.
8. A processing method for colorless yellow transparent polyimide film is characterized by comprising the following steps:
the method comprises the following steps: preparing the blue transparent hardened layer coating according to claim 3 or 4;
step two: coating the blue transparent hardened layer coating on the surface of the transparent polyimide film with a first yellowing degree, and primarily drying the blue transparent hardened layer coating;
step three: irradiating with high-pressure mercury lamp with irradiation energy of 500-2And the blue transparent hardened layer coating is quickly cured under the action of ultraviolet ray irradiation and an initiator, and forms physical connection and chemical bond connection with the transparent polyimide film to prepare the transparent polyimide composite film with the hardened surface and colorless or low yellowing degree.
9. A colorless composite film is characterized by comprising a yellow transparent polyimide film and a blue transparent hardened layer positioned on the surface of the transparent polyimide film, wherein the yellowing degree b of the blue transparent hardened layer is less than 0; the blue transparent hardened layer and the transparent polyimide are subjected to optical compensation, and the hardened transparent polyimide colorless composite film is obtained under the condition that the light transmittance is not obviously reduced.
10. The colorless composite film according to claim 9, wherein the yellow transparent polyimide film has a b value of greater than 0.8 and less than 3; the yellowing degree b value of the transparent polyimide colorless composite film is less than 0.6.
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| CN106409150A (en) * | 2015-07-31 | 2017-02-15 | 三星Sdi株式会社 | Window film and flexible display including the same |
| JP2018100353A (en) * | 2016-12-21 | 2018-06-28 | アイカ工業株式会社 | Ultraviolet-curable resin composition and weather-resistant hard coat film |
| CN109686476A (en) * | 2019-01-04 | 2019-04-26 | 深圳市华科创智技术有限公司 | A kind of silver nanowires transparent conductive film reducing yellowing |
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2020
- 2020-07-17 CN CN202010693016.0A patent/CN111961243A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1462237A (en) * | 2001-03-15 | 2003-12-17 | 三井化学株式会社 | Laminated body and display device using the laminated body |
| CN106409150A (en) * | 2015-07-31 | 2017-02-15 | 三星Sdi株式会社 | Window film and flexible display including the same |
| JP2018100353A (en) * | 2016-12-21 | 2018-06-28 | アイカ工業株式会社 | Ultraviolet-curable resin composition and weather-resistant hard coat film |
| CN109686476A (en) * | 2019-01-04 | 2019-04-26 | 深圳市华科创智技术有限公司 | A kind of silver nanowires transparent conductive film reducing yellowing |
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