WO2015035824A1

WO2015035824A1 - Pet film with capability of absorbing and converting ultraviolet light and short-wave blue light, and preparation method therefor

Info

Publication number: WO2015035824A1
Application number: PCT/CN2014/081974
Authority: WO
Inventors: 金国华
Original assignee: 苏州袭麟光电科技产业有限公司
Priority date: 2013-09-12
Filing date: 2014-07-10
Publication date: 2015-03-19
Also published as: CN103467936A; CN103467936B

Abstract

Disclosed is a PET film with the capability of absorbing and converting ultraviolet light and short-wave blue light. The PET film is made by weight part of the following raw materials: 20 - 95 parts of sliced pieces of a PET polyester, 1 - 15 parts of an ultraviolet light emission material, 0.5 - 12 parts of an ultraviolet-absorbing agent, and 0.1 - 10 parts of additives. Disclosed is a preparation method for the PET film. The PET film with the capability of absorbing and converting ultraviolet light and short-wave blue light according to the present invention can absorb invisible ultraviolet light and convert same into a blue or purple visible light having a longer wavelength. The functional film can absorb a high energy blue light of short-wave at a wavelength of 360 nm - 420 nm, which is extremely harmful to human eyes and can reflect a long-wave blue light at a wavelength of above 450 nm. The PET film can be widely employed for preparation of various protective films for liquid crystal screens which block blue light, heat-insulating films which block ultraviolet solar energy, etc.

Description

PET film capable of absorbing and transforming ultraviolet light and short-wave blue light and preparation method thereof

The invention belongs to the technical field of composite thin films, and particularly relates to a PET film capable of absorbing and converting ultraviolet light and short-wave blue light and a preparation method thereof. Background technique

At present, many UV-shielding film products in the world need to pass through the post-coating process. After many deep processing, the function of absorbing and converting ultraviolet light and short-wave blue light can be achieved, and in the coating process, the coating process is not perfect. If the cleanliness of the production environment is not up to standard, it will cause different levels of material waste. Summary of the invention

OBJECT OF THE INVENTION: In view of the deficiencies of the prior art, a first object of the present invention is to provide a PET film which can absorb and convert ultraviolet light and short-wave blue light.

A second object of the present invention is to provide a process for producing the PET film.

Technical Solution: In order to solve the above problems, the technical solution of the present invention is to provide a PET film which can absorb and convert ultraviolet light and short-wave blue light. The PET film is made of the following raw materials by weight: PET polyester slice 20 ~ 95 parts, 1 ~ 15 parts of UV luminescent material, 0.5 ~ 12 parts of UV absorber, 0.1 ~ 10 parts of auxiliaries. The PET polyester chips are various types of PET polyester chips with light or matte, semi-dull.

The PET polyester chip is a homopolyester or a copolyester. The homopolyester is a homopolyester formed by polycondensation of an aromatic dicarboxylic acid and an aliphatic diol, or polyethylene terephthalate, and the aromatic dicarboxylic acid is a pair. Benzoyl phthalate, the aliphatic diol is ethylene glycol. The copolyester is obtained by polymerizing a dicarboxylic acid and a glycol, and the dicarboxylic acid is one of isophthalic acid, phthalic acid, terephthalic acid, adipic acid, and the like. Mixed with one kind or several kinds, the diol is ethylene glycol, one One or more of diethylene glycol, propylene glycol, dipropylene glycol and the like are mixed. The ultraviolet luminescent material is an inorganic or organic ultraviolet luminescent material, and the inorganic ultraviolet luminescent material is 3Ca ₃ (P0 ₄ ) _{2 .} Ca(F, Cl) ₂ : Sb, Mn, yttrium activated yttrium oxide (Y ₂ 0 ₃ :Eu), 铈, 铽-activated aluminate (MgAluO^Ce, Tb), low-valent ruthenium-activated bismuth magnesium aluminate (BaM _g2 All ₆ 0 ₂₇ :Eu;), manganese-activated magnesium fluoroantimonate or tin Activated phospholipin powder, YV0 ₄ :Eu, Y(PV)0 ₄ :Eu, (BaSi ₂ 0 ₃ ):Pb, [(Ca, Ζη) ₃ (Ρ04) 2:Τ1], pyrophosphate (Sr) ₂ P ₂ 0 ₇ :Eu), any one or more of magnesium gallate (M _g Ga ₂ 0 ₄ : Mn) and silicic acid (Zn ₂ Si0 ₄ : Mn), the above inorganic ultraviolet light The material is dispersed to a nanometer level by a sanding process; or various organic and inorganic ultraviolet absorbers are coupled to the surface of the inorganic ultraviolet luminescent material by a coupling agent. The modified inorganic ultraviolet luminescent material may be added at each melting stage of the polyester chip, preferably at the mixing stage of the initial melting of the polyester chip;

The organic ultraviolet luminescent material is a grafted, mosaic-treated sodium stilbene benzenedisulfonate, 2,5-bis-(5-tert-butyl-2-benzoxazolyl)thiophene, 1- Any one or more of sulfonylaminophenyl-3-p-chlorophenyl-2-pyrazoline and benzodiazepine are mixed. The organic ultraviolet luminescent material is a resin group matching various organic ultraviolet absorbing agents and organic ultraviolet luminescent materials under the catalysis of an isocyanate compound, an oxazoline compound, a hexamethoxy fluorenyl melamine, an alkali metal or the like as a catalyst. The group is grafted or inlaid, or the organic ultraviolet luminescent material is coupled to the inorganic ultraviolet absorbing agent, thereby modifying the organic ultraviolet luminescent material. Wherein the coupling is coupled by a silane coupling agent, since the coupling agent itself has this function, the coupling is through its own two groups, one is reactive with inorganic substances, and the other is The group reacts with the organic matter, and the reaction can be carried out by stirring. The modified organic ultraviolet luminescent material may be added at each melting stage of the polyester chip, preferably at the mixing stage where the polyester chips are initially melted.

The ultraviolet absorber is an organic ultraviolet absorber or an inorganic ultraviolet absorber, an organic or inorganic ultraviolet absorber, and the main purpose of the addition is to improve the weather resistance of the film, and various types of polyester chips can be added in any production process. UV absorber. From the viewpoint of transparency and durability, an organic ultraviolet absorber is preferred, and the organic ultraviolet absorber is 2-(2, -hydroxy-3,, 5, - Di-tert-butylphenyl)-5-chlorobenzotriazole, 2-hydroxy-4-n-octyloxybenzophenone, (2-hydroxy-4-indolylphenyl)phenyl ketone, 2- [2-hydroxy-5-(1 ,1 ,3 ,3-tetradecylbutyl)phenyl]benzotriazole, 2-(2,-hydroxy-3,,5,-di-t-pentylphenyl) Any one or more of benzotriazole, from the viewpoint of high efficiency and long-term durability, an inorganic ultraviolet absorber which is nano-oxidized, nano-tin oxide, nano-indium tin oxide, nano-nano is preferable. Any one or more of tin oxide strontium are mixed.

The main purpose of the additive is anti-scratch, anti-blocking additive, anti-scratch, anti-adhesion additive, in order to carry out the winding operation between the film layer and the film layer in the production process of the stretched polyester film. The main purpose is to impart slidability between the film layer and the film layer and to prevent scratching in each production process, so as to increase the micro-roughness of the film surface after molding, and ensure that the film layer and the film layer are properly mixed in the winding process. The air is to ensure that there is no adhesion between the film layer and the layer. The anti-scratch and anti-blocking additive is a mixture of any one or a combination of silica, calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, magnesium sulfate, kaolin, alumina, and titania. Further, the average particle diameter of the particles to be used is usually from 0.005 to 5 μm, preferably from 0.05 to 1 μm. When the average particle diameter is less than 0.05 μm, the slidability is not sufficiently imparted, or the particles are aggregated, the dispersibility is insufficient, and the transparency of the film is lowered. On the other hand, when it is larger than Ιμπι, the surface roughness of the film becomes too thick, and the film is subjected to deep processing after the film is formed, which causes a visual effect in light transmittance. Further, the content of the scratch-preventing and anti-blocking additive is usually 0.0005 to 8%, preferably 0.001 to 1%, of the polyester film. When the content of the anti-scratch and anti-blocking additive is less than 0.001%, the slidability between the film layer and the layer may be insufficient, which may cause scratching and blocking problems; on the other hand, the above-mentioned anti-scratch and anti-blocking additive When the content is more than 1%, the transparency of the film may be insufficient. The above-mentioned anti-scratch and anti-blocking additives may be added at each melting stage of the polyester chips, preferably at the mixing stage where the polyester chips are initially melted.

The preparation method of the PET film comprises the following steps:

1) The above-mentioned parts by mass of PET polyester chips, ultraviolet luminescent materials, ultraviolet absorbing materials and auxiliaries are put into a high-speed mixer for high-speed stirring and mixing, and then the mixer is controlled to break up the materials into granules to complete the preliminary melt mixing of the materials. Material A is obtained, the mixing temperature is 85 ~ 100 ° C, and the mixing time is 1 ~ 6h, the stirring speed is 500 ~ 2000 rev / min, in order to achieve the purpose of mixing raw materials;

2) Material A is pre-crystallized and dried to obtain material B. The pre-crystallization and drying temperature are controlled at 150 ~ 170 °C, the drying time is controlled at 2 ~ 5h, and the mass fraction of water in material B after drying is controlled at 5 * 10· ⁷ or less;

3) The material is put into a twin-screw machine for further melt blending to obtain material C, the melting temperature is controlled at 200 ~ 300 °C, the screw speed is 100 ~ 1500r/min, and the stirring time is controlled at 1 ~ 6h; , the ultraviolet absorber and the auxiliary agent are completely dispersed uniformly in the main polyester;

4) The molten material C is extruded through an extruder to obtain a sheet, and then the sheet is stretched stepwise or the sheet is simultaneously stretched to obtain a PET film which can absorb and convert ultraviolet light and short-wave blue light.

The thickness of the stretched PET film is preferably between 5 and 500 μm.

The step stretching comprises the following steps: First, the sheet is stretched in one direction by a stretching machine, and the first stretching temperature is 60 to 130 ° C, preferably 85 to 100 ° C. The first stretching ratio is 2.5 to 7.5 times, preferably 4.0 to 6 times; the second step is to stretch the sheet in a direction orthogonal to the stretching direction of the first stage, the second stretching temperature For 90 ~ 180 ° C, the second step draw ratio is 2.0 ~ 8 times, preferably 4 ~ 6 times; the third step, heat treatment at 180 ~ 300 ° C under tight tension to obtain absorbable and converted Ultraviolet light and short-wave blue PET film.

The simultaneous biaxial stretching is at a stretching temperature of 60 to 130 ° C, preferably 85 to 100 ° C, and the stretching ratio is 2 to 60 times, preferably 10 to 25 times, in the length direction and width. The direction is simultaneously stretched, and the heat treatment is carried out at a temperature of 180 to 300 ° C to obtain a PET film which can absorb and convert ultraviolet light and short-wave blue light. Regarding the simultaneous biaxial stretching device using the above stretching method, a conventionally known stretching method such as a spiral method, a zooming method, or a linear driving method can be employed.

Advantageous Effects: The PET film capable of absorbing and converting ultraviolet light and short-wave blue light has the function of ultraviolet excitation and blue light reflection, and can absorb invisible ultraviolet light and convert into blue or purple with longer wavelength. Visible light, the functional film can absorb wavelengths of 360nm ~ 420nm high-energy short-wave blue light that is extremely harmful to the human eye, reflects long-wave blue visible light with a wavelength of 450nm or more. With this feature, it can be widely used to make various types of blue-screen LCD screen protection film, UV-solar solar isolation. Products such as hot film can effectively block the harmful effects of harmful ultraviolet light and short-wave blue light encountered in normal life. The invention adopts the direct drawing film forming of the polyester chip after high-temperature melting, and can not only effectively and effectively have the function of preventing ultraviolet light and blue light, but also reduces the glue coating process in the production and use process, thereby saving a large production cost, so Has a broad market application prospects. detailed description

The invention is further illustrated below in conjunction with specific embodiments.

Example 1

A PET film capable of absorbing and converting ultraviolet light and short-wave blue light, the PET film is made of the following raw materials by weight: 20 parts of PET polyester chips, 1 part of ultraviolet light-emitting material, 0.5 by ultraviolet light absorption agent, Additive 0.1.

The PET polyester chip is a homopolyester.

The homopolyester is a polyester obtained by polycondensation of an aromatic dicarboxylic acid and an aliphatic diol, the aromatic dicarboxylic acid is terephthalic acid, and the aliphatic diol is ethylene glycol. .

The ultraviolet luminescent material is an inorganic ultraviolet luminescent material, and the inorganic ultraviolet luminescent material is 3Ca ₃ (P04) ₂ -Ca(F, Cl) ₂ :Sb, Mn, Y ₂ 0 ₃ :Eu and MgAl„0 ₁₉ :Ce , Tb mixed.

The ultraviolet absorber is an organic ultraviolet absorber, and the organic ultraviolet absorber is 2-(2'-hydroxy-3,5,-di-tert-butylphenyl)-5-chlorobenzotriazole and 2-hydroxy-4-n-octyloxydibenzoquinone is mixed.

The auxiliary agent is an anti-scratch and anti-blocking additive, and the anti-scratch and anti-blocking additive is a mixture of silicon dioxide and calcium carbonate.

The preparation method of the PET film comprises the following steps: 1) The above-mentioned parts by mass of PET polyester chips, ultraviolet luminescent materials, ultraviolet absorbing materials and auxiliaries are put into a high-speed mixer for high-speed stirring and mixing, and then the mixer is controlled to break up the materials into granules to complete the preliminary melt mixing of the materials. Obtaining material A, the mixing temperature is 85 ° C, the mixing time is lh, and the stirring speed is 500 rpm;

2) the material A is pre-crystallized and drying operation to obtain the material B, pre-crystallization and the drying temperature was controlled at 150 ° C, the drying time is controlled at 2h, the mass fraction of material B after drying the water is controlled to 5 * 10_ ⁷ or less ;

3) The material B is put into the twin-screw machine for further melt blending to obtain the material C, the melting temperature is controlled at 200 ° C, the screw speed is 100 r / min, and the stirring time is controlled at lh;

4) The molten material C is extruded through an extruder to obtain a sheet, and then the sheet is stretched stepwise to obtain a PET film which can absorb and convert ultraviolet light and short-wave blue light.

The step stretching comprises the following steps: First, stretching the sheet in one direction by using a stretching machine, the first stretching temperature is 60 ° C, and the first stretching ratio is 2.5 times; In the second step, the sheet is stretched in a direction orthogonal to the stretching direction of the first stage, the second step stretching temperature is 90 ° C, and the second step stretching ratio is 2.0 times; The PET film which can absorb and convert ultraviolet light and short-wave blue light is obtained by heat treatment at a temperature of 180 ° C under a tight pull.

The above stretched PET film has a thickness of between 500 μm.

The PET film which can absorb and convert ultraviolet light and short-wave blue light as described in Example 1 was subjected to performance test, and the results were as follows:

MD 3820 modulus of elasticity Mpa

TD 3750

MD 1.2

Heat shrinkage %

TD 0.1

0.45

Coefficient of friction

0.45 light transmittance % 90 haze % 1.0 Example 2

A PET film capable of absorbing and converting ultraviolet light and short-wave blue light, the PET film is made of the following raw materials by weight: 95 parts of PET polyester chips, 15 parts of ultraviolet light-emitting materials, 12 parts of ultraviolet light absorbers, and assistance 10 parts.

The PET polyester chip is a copolyester. The copolyester is obtained by polymerizing a dicarboxylic acid and a glycol, the dicarboxylic acid is isophthalic acid, and the dihydric alcohol is diethylene glycol.

The ultraviolet luminescent material is an organic ultraviolet luminescent material, which is a grafted, mosaic-treated sodium stilbene bisphenyldiate and a 2,5-bis-(5-tert-butyl-2) - benzoxazolyl) thiophene mixed. The ultraviolet absorber is an inorganic ultraviolet absorber, and the inorganic ultraviolet absorber is a mixture of nano-oxidation and nano-tin oxide.

The auxiliary agent is an anti-scratch and anti-blocking additive, and the anti-scratch and anti-blocking additive is a mixture of magnesium carbonate, barium carbonate, calcium sulfate and magnesium sulfate.

The preparation method of the PET film comprises the following steps:

1) The above-mentioned parts by mass of PET polyester chips, ultraviolet luminescent materials, ultraviolet absorbing materials and auxiliaries are put into a high-speed mixer for high-speed stirring and mixing, and then the mixer is controlled to break up the materials into granules to complete the preliminary melt mixing of the materials. Material A was obtained, the mixing temperature was 100 ° C, and the mixing time was 6 h. Stirring speed is 2000 rev / min;

2) The pre-crystallized material A and material B to give drying operation, pre-crystallization and the drying temperature was controlled at 170 ° C, drying time control 5h, the mass fraction of material B after drying the water is controlled to 5 * ^10-7 the following;

3) The material B is put into the twin-screw machine for further melt blending to obtain the material C, the melting temperature is controlled at 300 ° C, the screw rotation speed is 1500 r / min, and the stirring time is controlled at 6 h;

4) The molten material C is extruded through an extruder to obtain a sheet, and then the biaxially stretched sheet is obtained to obtain a PET film which can absorb and convert ultraviolet light and short-wave blue light.

The simultaneous biaxial stretching is performed at a stretching temperature of 130 ° C and a stretching ratio of 60 times in area magnification, and the sheet is stretched simultaneously in the longitudinal direction and the width direction, and continues to be pulled at a temperature of 300 ° C. The heat treatment is carried out to obtain a PET film which can absorb and convert ultraviolet light and short-wave blue light.

The above stretched PET film has a thickness of between 5 μm.

0.36

Light transmittance % 92

Haze % 0.8

Example 3

A PET film capable of absorbing and converting ultraviolet light and short-wave blue light, the PET film is made of the following raw materials by weight: 55 parts of PET polyester chips, 8 parts of ultraviolet luminescent materials, 6 parts of ultraviolet absorbing agent, and help Agent 5.

The PET polyester chip is a homopolyester. The homopolyester is a homopolyester formed from polyethylene terephthalate.

The ultraviolet luminescent material is an inorganic ultraviolet luminescent material, and the inorganic ultraviolet luminescent material is a mixture of BaM _g2 A1160 ₂₇ :Eu, manganese activated magnesium fluoroantimonate or tin activated phosphoric acid sputum powder and YV0 ₄ :Eu.

The ultraviolet absorber is an inorganic ultraviolet absorber, and the inorganic ultraviolet absorber is nanometer tin oxide.

The auxiliary agent is an anti-scratch and anti-blocking additive, and the anti-scratch and anti-blocking additive is a mixture of calcium sulfate, magnesium sulfate, kaolin, alumina and titanium oxide.

The preparation method of the PET film comprises the following steps:

1) The above-mentioned parts by mass of PET polyester chips, ultraviolet luminescent materials, ultraviolet absorbing materials and auxiliaries are put into a high-speed mixer for high-speed stirring and mixing, and then the mixer is controlled to break up the materials into granules to complete the preliminary melt mixing of the materials. Material A was obtained, the mixing temperature was 95 ° C, the mixing time was 3.5 h, and the stirring speed was 1250 rpm.

2) the material A is pre-crystallized and drying operation to obtain the material B, pre-crystallization and the drying temperature was controlled at 160 ° C, the drying time is controlled to 3h, the mass fraction of material B after drying the water is controlled to 5 * 10_ ⁷ or less ;

3) Put material B into a twin-screw machine for further melt blending to obtain material C, melting temperature The degree is controlled at 250 ° C, the screw speed is 800 r / min, and the stirring time is controlled at 3 h.

The step stretching comprises the following steps: First, stretching the sheet in one direction by using a stretching machine, the first stretching temperature is 85 ° C, and the first stretching ratio is 4 times; In the second step, the sheet is stretched in a direction orthogonal to the stretching direction of the first stage, and the second step stretching temperature is 150.

°C, the second step of the draw ratio is 4 times; the third step, heat treatment at 240 ° C under the tension to obtain a PET film that can absorb and convert ultraviolet light and short-wave blue light.

The above stretched PET film has a thickness of between 250 μm.

The PET film which can absorb and convert ultraviolet light and short-wave blue light as described in Example 3 was tested for performance, and the results were as follows:

Example 4

Basically the same as Embodiment 1, except that the inorganic ultraviolet luminescent material is

Y(PV)04: a mixture of Eu, (BaSi203): Pl^o [(Ca, Ζη) 3 (Ρ04) 2: Τ 1]. The organic ultraviolet absorber is a mixture of 2-hydroxy-4-n-octyloxybenzophenone and (2-hydroxy-4-indolylphenyl)phenyl ketone. The anti-scratch, anti-blocking additive is a mixture of kaolin and alumina. The stretched PET film has a thickness of between 300 μm.

The PET film which can absorb and convert ultraviolet light and short-wave blue light as described in Example 4 was subjected to performance test, and the results were as follows:

Example

Basically the same as Example 2, except that the dicarboxylic acid is phthalic acid and the glycol is propylene glycol. The grafted, mosaic-treated 1-p-sulfonamide of the organic ultraviolet luminescent material A mixture of phenyl-3-p-chlorophenyl-2-pyrazoline and benzodiazepine. The ultraviolet absorber is an organic ultraviolet absorber, and the organic ultraviolet absorber is 2-[2-hydroxy-5-(1,1,3,3-tetradecylbutyl)phenyl]benzotriazole, 2 a mixture of -(2,-hydroxy-3,,5,-di-t-pentylphenyl)benzoxazole. The anti-scratch, anti-blocking additive is a mixture of alumina and titania. The stretched PET film has a thickness of between 350 μm.

The PET film which can absorb and convert ultraviolet light and short-wave blue light as described in Example 5 was subjected to performance test, and the results were as follows:

Example 6

Basically the same as Example 3, except that the inorganic ultraviolet luminescent material is strontium pyrophosphate (Sr ₂ P ₂ 0 ₇ :Eu), magnesium gallate (MgGa ₂ 0 ₄ : Mn), and zinc silicate (Zn). ₂ Si0 ₄ : Mn) mixture. The inorganic ultraviolet absorber is a mixture of nano tin oxide and nano indium tin oxide. The anti-scratch and anti-blocking additive is a mixture of barium carbonate, calcium sulfate, magnesium sulfate, and kaolin. Stretched PET The film thickness is between 400 μm.

Performance measurement of PET film capable of absorbing and converting ultraviolet light and short-wave blue light as described in Example 6

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

Rights request

A PET film capable of absorbing and converting ultraviolet light and short-wave blue light, characterized in that, in parts by weight, the PET film is made of the following materials: PET polyester chips 20 to 95 parts, ultraviolet light-emitting material 1 ~ 15 parts, 0.5 ~ 12 parts of UV absorber, 0.1 ~ 10 parts of additives.

The PET film which can absorb and convert ultraviolet light and short-wave blue light according to claim 1, wherein the PET polyester chip is a homopolyester or a copolyester.

The PET film capable of absorbing and converting ultraviolet light and short-wave blue light according to claim 2, wherein the homopolyester is a polyester obtained by polycondensing an aromatic dicarboxylic acid and an aliphatic diol or A homopolyester formed by polyethylene terephthalate, the aromatic dicarboxylic acid is terephthalic acid, and the aliphatic diol is ethylene glycol.

The PET film capable of absorbing and converting ultraviolet light and short-wave blue light according to claim 2, wherein the copolymerized polyester is obtained by polymerizing a dicarboxylic acid and a glycol, and the dicarboxylic acid Is one or more of isophthalic acid, phthalic acid, terephthalic acid, adipic acid, etc., the glycol is ethylene glycol, diethylene glycol, propylene glycol, One or more of dipropylene glycol and the like.

The PET film according to claim 1 , wherein the ultraviolet light-emitting material is an inorganic or organic ultraviolet light-emitting material, and the inorganic ultraviolet light-emitting material is 3Ca ₃ (P0). ₄ ) ₂ 'Ca(F , Cl) ₂ :Sb , Mn, Y ₂ 0 ₃ :Eu, MgAl„0 ₁₉ :Ce, Tb, BaM _g2 Al ₁₆ 0 ₂₇ :Eu, manganese-activated magnesium fluoroantimonate or tin Activated phospholipin powder, YV0 ₄ :Eu, Y(PV)0 ₄ :Eu, (BaSi ₂ 0 ₃ ):Pb, C (Ca, Zn) ₃ (P0 ₄ ) ₂ :Tl], Sr ₂ P ₂ 0 ₇ : Eu, MgGa ₂ 0 ₄ : Mn and Zn ₂ Si0 ₄ : Mn are mixed by any one or more, the organic ultraviolet luminescent material is grafted, mosaic-treated stilbene biphenyl Sodium disulfonate, 2,5-bis-( 5-tert-butyl-2-benzoxanthyl) thiophene, 1-p-sulfonylaminophenyl-3-p-chlorophenyl-2-pyrazoline, Any one or more of benzodiazepines are mixed.

The PET film capable of absorbing and converting ultraviolet light and short-wave blue light according to claim 1, wherein the ultraviolet absorber is an organic ultraviolet absorber or an inorganic ultraviolet absorber. The organic ultraviolet light is 2-(2,-hydroxy-3,5,-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-hydroxy-4-n-octyloxydiphenylhydrazine Ketone, (2-hydroxy-4-indolylphenyl)phenyl ketone, 2-[2-hydroxy-5-(1,1,3,3-tetradecylbutyl)phenyl]benzotriazole, 2 Any one or more of -(2, -hydroxy-3,5,2-dipentylphenyl)benzotriazole, the inorganic ultraviolet absorber is nano-oxidized, nano-tin oxide, nano-oxidation Any one or more of indium tin and nano tin oxide.

The PET film capable of absorbing and converting ultraviolet light and short-wave blue light according to claim 1, wherein the auxiliary agent is an anti-scratch and anti-blocking additive, and the anti-scratch and anti-blocking additive is two. Any one or a combination of silicon oxide, calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, magnesium sulfate, kaolin, alumina, and titanium oxide.

The method for preparing a PET film according to any one of claims 1 to 7, which comprises the following steps:

1) The above-mentioned parts by mass of PET polyester chips, ultraviolet luminescent materials, ultraviolet absorbing materials and auxiliaries are put into a high-speed mixer for high-speed stirring and mixing, and then the mixer is controlled to break up the materials into granules to complete the preliminary melt mixing of the materials. Obtaining material A, the mixing temperature is 85 ~ 100 °C, the mixing time is 1 ~ 6h, and the stirring speed is 500 ~ 2000 rev / min;

2) Material A is pre-crystallized and dried to obtain material B. The pre-crystallization and drying temperature are controlled at 150 ~ 170 °C, the drying time is controlled at 2 ~ 5h, and the mass fraction of water in material B after drying is controlled at 5 * ^10-7 or less;

3) The material B is put into the twin-screw machine for further melt blending to obtain the material C, the melting temperature is controlled at 200 ~ 300 °C, the screw speed is 100 ~ 1500r / min, and the stirring time is controlled at 1 ~ 6h;

4) Extruding the melted material C through an extruder to obtain a sheet, and then stretching the sheet stepwise or simultaneously stretching the sheet to obtain a PET film which can absorb and convert ultraviolet light and short-wave blue light.

The preparation method according to claim 8, wherein the step stretching comprises the following steps: First, the sheet is stretched in one direction by a stretching machine, and the first step is stretched Temperature is

60 ~ 130 ° C, the first stretching ratio is 2.5 ~ 7.5 times; the second step, stretching the sheet in a direction orthogonal to the stretching direction of the first stage, the second stretching temperature is 90 ~ 180 ° C, the second step of stretching The magnification is 2.0 to 8 times; the third step is to heat-treat at a temperature of 180 to 300 ° C under a tight pull to obtain a PET film which can absorb and convert ultraviolet light and short-wave blue light.

The preparation method according to claim 8, wherein the simultaneous biaxial stretching is performed at a stretching temperature of 60 to 130 ° C, and the stretching ratio is 2 to 60 times in area magnification, in the longitudinal direction. The sheet is stretched at the same time as the width direction, and heat treatment is continued at a temperature of 180 to 300 ° C to obtain a PET film which can absorb and convert ultraviolet light and short-wave blue light.