CN105778070B - Preparation method of anti-fog and anti-ultraviolet polyester film - Google Patents

Abstract

The invention relates to a method for preparing an anti-fog and anti-ultraviolet polyester film. Dibasic acid, water, and caprolactam are fully mixed in a certain molar ratio to carry out prepolymerization to obtain a HOOC‑(CONH)n‑COOH product; and then add Nano-zinc oxide and benzenesulfonic acid continue to stir and react to make hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer; will make prepolymer, dibasic acid, dibasic alcohol, polycondensation catalyst and Heat stabilizers and antioxidants are mixed and beaten for esterification and polycondensation reactions to prepare hydrophilic and anti-ultraviolet modified polyester; the hydrophilic and anti-ultraviolet modified polyester is used as component A, and conventional polyester is used as component B. The body tube is co-extruded through a T-shaped die to form A and B double layers or ABA three layers, and the anti-fog and anti-ultraviolet polyester film is obtained through casting, biaxial stretching, heat setting and winding. The invention can solve the problem of the dispersibility of the inorganic powder in the polyester matrix.

Description

Preparation method of anti-fog and anti-ultraviolet polyester film

technical field

The invention relates to a preparation method of an anti-fog and anti-ultraviolet polyester film, which belongs to the technical field of polyester films.

Background technique

In daily life, when there is a certain temperature difference or humidity difference between the inside and outside of glasses, car window glass, building interior and exterior window glass, etc., they will often be fogged and affect the use. Ultraviolet rays in the sun can cause aging and damage to materials, and long-term direct sunlight can also cause radiation damage to the human body. Therefore need a kind of film with anti-fog and anti-ultraviolet function, be used for spectacle lens, building glass, automobile sunroof or side window glass etc., can prevent surface from fogging, also has the effect of anti-ultraviolet simultaneously.

In terms of anti-fog polyester film research, the essence of fog is water vapor condensation. Fog in nature is formed when water vapor in the air condenses into droplets when the temperature reaches or is very close to the dew point. The fog formed on solid surfaces such as film and glass is caused by the condensation of water vapor into liquid droplets due to the increase of dew point temperature caused by the air contacting the solid surface below the dew point temperature or the increase of humidity. When the fog condenses on the surface of a transparent object, it will have a great impact on the transmission of light. When driving a car or using glasses, diving goggles, electron microscopes, etc., because the fog hinders the penetration of light, it affects the user's sight. By reducing the contact angle of surface fog droplets, the anti-fog performance of the film can be improved. Polyester is one of the most widely used materials in the field of film preparation, but conventional polyester has regular molecular structure, high crystallinity, tight molecular chain arrangement, and lack of polar functional groups, resulting in poor hygroscopicity. The gaseous adsorption rate of the ester is only 0.2-0.3%, and the surface contact angle is ≥90°. For polyester film products, the surface energy and wettability of the material are usually increased by coating hydrophilic polymer materials and surfactants on the surface of the material, and hydrophilic nanoparticles are introduced to form a rough surface to achieve super Hydrophilic effect. However, higher requirements are put forward for the coating process of the film, and at the same time, it is difficult to achieve the long-lasting performance of the anti-fog performance of the substrate during use through coating. Patent CN102794965A discloses "an anti-fog polyester film and its preparation method". The anti-fog polyester film has an A-B-A structure, A layer is a modified polyester layer, and B is a pure polyester layer. A certain proportion of antifogging agent and synergist is introduced into the modified polyester, but the antifogging agent and synergist components introduced in the form of blending have the problem of poor compatibility with the matrix material at a high content ratio , At the same time, there is also the problem of thermal stability of the anti-fogging agent and synergist during the molding process.

In terms of anti-ultraviolet polyester film research and product development, the introduction of hindered amine side-group organic light stabilizers and nano-inorganic functional powders in the polyester synthesis stage is mainly formed to endow polyester films with anti-ultraviolet effect. "An anti-ultraviolet polyester film" disclosed in CN105085887A utilizes a copolyester containing hindered amine side groups as a material for an anti-ultraviolet polyester film, and the prepared anti-ultraviolet polyester film has good mechanical properties and UV stability Etc. However, in fields with high requirements for anti-ultraviolet performance, it is necessary to introduce a high content of organic components into polyester through copolymerization, which will have a great impact on its film-forming properties; Material and its preparation method” and CN1552765C disclosed “in-situ generation of nano-titanium dioxide to prepare anti-ultraviolet polyester method” all realize the anti-ultraviolet effect of polyester by introducing nano-inorganic powder in the polyester preparation stage, making full use of the inorganic powder The body has excellent anti-ultraviolet performance characteristics at low content addition. However, when nano-inorganic powders are introduced into polymers, the biggest problem is that due to their small size and large specific surface, they are easy to cause agglomeration, which adversely affects the molding process and gloss of polymers.

Although there are relevant literature reports at home and abroad on the anti-fog and anti-ultraviolet properties of polyester films, there are few reports on how to realize the anti-fog and anti-ultraviolet multifunctional composite of polyester films. Without a separate scientific design, it is impossible to realize the efficient synergy of organic and inorganic modified components.

Contents of the invention

The purpose of the present invention is to provide a preparation method of anti-fog and anti-ultraviolet polyester film, which can solve the problem of the dispersion of inorganic powder in the polyester matrix, and can achieve the final preparation by controlling the feed ratio of the prepolymer. Effective regulation of the anti-fog performance and anti-ultraviolet performance of the polyester film.

The technical scheme of the present invention for achieving the above-mentioned purpose is: a kind of preparation method of anti-fog anti-ultraviolet polyester film, it is characterized in that: carry out according to the following steps,

The first step: Synthesis of hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer,

Dibasic acid, water, and caprolactam are fully mixed according to the molar ratio of 0.01-0.1:0.01-0.05:1 for pre-polymerization, the pressure of the pre-polymerization is controlled at 0.01-0.5 MPa, and the reaction temperature is controlled at 230-260°C. Pre-polymerization for 2 to 4 hours to prepare HOOC-(CONH)n-COOH products with a relative viscosity of 1.1 to 1.4 and a molecular weight of 1000 to 4000 g/mol; then add nano-zinc oxide powder and benzenesulfonic acid and continue to stir for the reaction. The amount of nano-zinc oxide powder added is 0.2-2% of the mass of caprolactam, the amount of benzenesulfonic acid added is 200-500ppm of the mass of caprolactam, the reaction temperature is controlled at 235-255°C, and the reaction time is controlled at 1-2h. Prepare a hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer;

The second step: preparing hydrophilic anti-ultraviolet modified polyester,

Mix and beat the prepared hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer, dibasic acid, dibasic alcohol, polycondensation catalyst, heat stabilizer and antioxidant to carry out esterification and polycondensation reactions to prepare hydrophilic Water anti-ultraviolet modified polyester; wherein, the molar ratio of the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer, dibasic acid, and dibasic alcohol is 0.01～0.1:1:1.2～1.5 , the addition of the polycondensation catalyst is 100 to 500 ppm of the mass of the dibasic acid, the addition of the heat stabilizer is 0.001 to 0.02 percent of the mass of the dibasic acid, and the addition of the antioxidant is 0.001 to 0.03 percent of the mass of the dibasic acid %;

The third step: processing the anti-fog and anti-ultraviolet polyester film,

The prepared hydrophilic and anti-ultraviolet modified polyester is used as component A, and the conventional polyester is used as component B, which is co-extruded through a melt tube through a T-shaped die to form A and B double-layers or ABA three-layers. Anti-fog and anti-ultraviolet polyester film is obtained by biaxial stretching, heat setting and winding.

Wherein: the thickness of the anti-fog and anti-ultraviolet polyester film is 20 μm to -400 μm, the liquid moisture contact angle of layer A of the anti-fog and anti-ultraviolet polyester film is ≤30°, the ultraviolet blocking rate is 380nm, and UVR≥98%.

The temperature during the esterification reaction is controlled at 240-260° C., the time is controlled at 3-5 hours, and the water output of the esterification reaches more than 98% of the theory, and then the polycondensation reaction is carried out for 2-4 hours. The vacuum pressure of the polycondensation reaction is 30-50 200pa.

The nano-zinc oxide powder is prepared by a calcining method, and the size of the nano-zinc oxide powder is 50-100 nm.

The dibasic acid is used as an end-capping agent for polyamide, and the dibasic acid is one or any two or more of oxalic acid, succinic acid, adipic acid or glutaric acid.

The dihydric alcohol is one or any two or more of ethylene glycol, propylene glycol, butanediol or pentanediol.

The polycondensation catalyst is one or any two or more of tetrabutyl titanate, titanium ethylene glycol, antimony trioxide, antimony acetate, and antimony ethylene glycol.

The heat stabilizer is one of trimethyl phosphate, alkyl phosphate diester or tris(nonylphenyl) phosphite or any two or more of them.

The antioxidant is one of antioxidant 1010, antioxidant 168 or antioxidant 616 or any two or more thereof.

The present invention has the following beneficial effects by adopting the above-mentioned technical scheme:

(1), in order to realize the anti-fog and anti-ultraviolet properties of polyester film, the present invention designs the compounding of inorganic/organic modified components, adopts two-step method to obtain hydrophilic anti-ultraviolet modified polyester, and hydrophilic anti-ultraviolet The relative number average molecular weight of HOOC-(NHCO)n-COO-ZnO prepolymer can be regulated by the addition amount of dibasic acid, and the addition amount of hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer can be Set according to the needs of the final product.

(2), the present invention first reacts the anti-ultraviolet inorganic nano-zinc oxide powder with the dibasic acid-terminated polyamide oligomer of a certain relative number-average molecular weight under catalyst conditions to generate a hydrophilic anti-ultraviolet HOOC-(NHCO )n-COO-ZnO prepolymer, the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer is mixed with dibasic acid, dibasic alcohol, polycondensation catalyst, heat stabilizer and antioxidant according to the unique The proportion is fed in the polyester esterification beating stage, and the esterification reaction and polycondensation reaction are completed successively to generate a hydrophilic and anti-ultraviolet modified polyester. The hydrophilic and anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer The method of polymerization is inserted into the polyester molecular chain to ensure the durability of the anti-fog and anti-ultraviolet properties. At the same time, the hydrophilic and anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer is connected with the polyester in the form of chemical bonds , to ensure good compatibility between prepolymer and polyester.

(3), when the present invention synthesizes the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer, the inorganic nano zinc oxide powder introduced, the surface and the polyamide of specific relative number average molecular weight are chemically bonded The form is connected to form a surface coating, which ensures good dispersion performance when introduced into the polyester matrix, greatly reduces the phenomenon of powder agglomeration, realizes the stability of the anti-fog and anti-ultraviolet polyester polymerization process, and solves the current problem of nano-inorganic powders. The key technical problem of not being able to disperse evenly.

(4), the present invention designs the polyester film to be AB double-layer or ABA three-layer, A layer component is the hydrophilic anti-ultraviolet modified polyester that prepares, and B layer component is conventional polyester, because in the film The matrix material in the layer A component is polyester, so there is no need for an adhesive layer with the B layer component, and it has thermodynamic compatibility. The film prepared by the present invention has excellent hydrophilic properties and the anti-ultraviolet effect of the inorganic powder because of the A-layer component, thereby endowing the film with good and durable anti-fog and anti-ultraviolet properties. The anti-ultraviolet prepolymer feed ratio can regulate the anti-fog and anti-ultraviolet properties of the polyester film, which is convenient for industrial production.

The anti-fog and anti-ultraviolet polyester film developed by the invention is especially suitable for spectacle lenses, architectural glass, automobile sunroof or side window glass and the like.

detailed description

The preparation method of the anti-fog and anti-ultraviolet polyester film of the present invention comprises sequentially the synthesis of a hydrophilic anti-ultraviolet prepolymer, the preparation of a hydrophilic and anti-ultraviolet modified polyester, and the processing to prepare an anti-fog and anti-ultraviolet polyester film. Specifically follow the steps below:

The first step: Synthesis of hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer.

Dibasic acid, water, and caprolactam are fully mixed according to the molar ratio of 0.01-0.1:0.01-0.05:1 to carry out prepolymerization reaction. The dibasic acid of the present invention is the end-capping agent of polyamide, and the dibasic acid adopts oxalic acid, One of succinic acid, adipic acid or glutaric acid or a mixture of any two or more, the dibasic acid of the present invention is an organic dibasic acid, and oxalic acid, succinic acid, adipic acid or glutaric acid Any two or more acids, and the ratio is not limited when two or more are mixed. The pressure of the pre-polymerization reaction of the invention is controlled at 0.01-0.5 MPa, the reaction temperature is controlled at 230-260°C, and the carboxyl-terminated polyamide with a relative viscosity of 1.1-1.4 and a molecular weight of 1000-4000 g/mol is obtained in the pre-polymerization reaction for 2 to 4 hours HOOC-(CONH)n-COOH. The pressure of the prepolymerization reaction of the present invention can also be controlled at 0.05～0.45MPa, the reaction temperature can also be controlled at 235～250°C, the prepolymerization reaction time can be controlled at 2.1～3.5h, and the obtained relative viscosity is 1.1～1.4, and the molecular weight is at 1000-4000g/mol carboxy-terminated polyamide HOOC-(CONH)n-COOH, dibasic acid, water, and caprolactam in molar ratio, the specific addition amount and process parameters are shown in Table 1.

Table 1

After obtaining the carboxy-terminated polyamide HOOC-(CONH)n-COOH, add nano-zinc oxide powder and benzenesulfonic acid to continue the reaction, and the added amount of the nano-zinc oxide powder is 0.2-2% of the caprolactam mass, The addition of benzenesulfonic acid as a catalyst is 200 to 500 ppm of the mass of caprolactam. The nano-zinc oxide powder of the present invention is prepared by a calcination method. Because the nano-zinc oxide powder has a quadrangular shape, it has good dispersion performance. The present invention The particle size of the nano-zinc oxide powder is 50-100nm, the reaction temperature is controlled at 235-255°C, and the reaction time is controlled at 1-2h, and the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer is prepared . In the present invention, the addition amount of nano-zinc oxide powder is 0.5-1.8% of the mass of caprolactam, the amount of benzenesulfonic acid added is 200-500ppm of the mass of caprolactam, the reaction temperature can also be controlled at 240-250°C, and the reaction time can also be Controlled within 1.2-1.8h, the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer is prepared.

In the present invention, the nano-scale inorganic anti-ultraviolet powder zinc oxide and the dibasic acid-terminated polyamide oligomer with a certain relative number-average molecular weight are reacted under the condition of catalyst benzenesulfonic acid to synthesize hydrophilic anti-ultraviolet HOOC-( NHCO)n-COO-ZnO prepolymer, and in the second step, the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer is charged in the polyester esterification beating stage according to a certain molar ratio, Complete esterification reaction and polycondensation reaction successively to generate hydrophilic anti-ultraviolet modified polyester, compound anti-fog and anti-ultraviolet properties of polyester film, make inorganic and organic modified components compound the hydrophilic anti-ultraviolet HOOC-(NHCO) The relative number-average molecular weight of n-COO-ZnO prepolymer can be regulated by the amount of dibasic acid added, and the amount of prepolymer added can be set according to the requirements of the final product. The nano-zinc oxide powder is based on the mass percentage of caprolactam , benzenesulfonic acid is shown in Table 2 according to the mass ppm of caprolactam, the specific addition amount and process parameters.

Table 2

The specific molecular formula of the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer obtained in the present invention is:

The inorganic nano-zinc oxide powder introduced by the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer of the present invention, the surface is connected with the polyamide with a specific relative number average molecular weight to form a surface coating in the form of chemical bonds, ensuring In order to introduce good dispersion performance into the polyester matrix, and the hydrophilic and anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer powder has a large organic steric hindrance on the surface, which solves the problem of powder agglomeration due to the large specific surface area and realizes Anti-fog and anti-ultraviolet polyester polymerization process stability.

The second step: preparing the hydrophilic anti-ultraviolet modified polyester.

Mix and beat the prepared hydrophilic anti-ultraviolet prepolymer containing HOOC-(NHCO)n-COO-ZnO components, dibasic acid, dibasic alcohol, polycondensation catalyst, heat stabilizer and antioxidant for esterification and polycondensation reaction Preparation of hydrophilic anti-ultraviolet modified polyester. Among them, the hydrophilic anti-ultraviolet prepolymer of the HOOC-(NHCO)n-COO-ZnO component, the dibasic acid, and the dibasic alcohol have a molar ratio of 0.01～0.1:1:1.2～1.5, and the same dibasic acid uses ethylene glycol acid, succinic acid, adipic acid or glutaric acid, or any two or more of them, and the glycol is one or any two or more of ethylene glycol, propylene glycol, butanediol or pentanediol, The ratio of any two or more of the above-mentioned dibasic acids and dibasic alcohols is not limited.

The polycondensation catalyst of the present invention is one or any two or more of tetrabutyl titanate, titanium ethylene glycol, antimony trioxide, antimony acetate, and antimony ethylene glycol, and the amount of polycondensation catalyst added is the mass of dibasic acid 100~500ppm. The heat stabilizer of the present invention is one of trimethyl phosphate, alkyl phosphoric acid diester or tri(nonylphenyl) phosphite or any two or more thereof, and the addition amount of heat stabilizer is 0.001～ 0.02%, the antioxidant of the present invention is one of antioxidant 1010, antioxidant 168 or antioxidant 616 or any two or more, and the addition amount of antioxidant is 0.001～0.03% of the mass of dibasic acid. The above-mentioned polycondensation catalyst, thermal When two or more stabilizers and antioxidants are mixed, the ratio is not limited. All materials can be mixed uniformly and then added to the polyester synthesis reactor for esterification and polycondensation reactions.

The present invention can also be a hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer, a dibasic acid, and a dibasic alcohol in a molar ratio of 0.03 to 0.08:1:1.3 to 1.45, and the addition amount of the polycondensation catalyst is two The mass of the basic acid is 200-480ppm, the amount of the heat stabilizer added is 0.005-0.18% of the mass of the dibasic acid; the amount of the antioxidant added is 0.005-0.025% of the mass of the dibasic acid.

The temperature during the esterification reaction of the present invention is controlled at 240-260° C., the time is controlled at 3-5 hours, and the water output of the esterification reaches more than 98% of the theory, and then the polycondensation reaction is carried out for 2-4 hours, and the vacuum pressure of the polycondensation reaction is 30-200 Pa , the esterification reaction of the present invention includes the reaction of dibasic acid and dibasic alcohol, and the reaction of dibasic alcohol and hydrophilic anti-ultraviolet prepolymer. Hydrophilic anti-ultraviolet prepolymer, dibasic acid, and dibasic alcohol in molar ratio, polycondensation catalyst in ppm of dibasic acid, heat stabilizer and antioxidant in mass percentage of dibasic acid, specific addition amount and process parameters see Table 3 shows.

table 3

The present invention feeds the hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer in the polyester esterification and beating stage, and introduces a synergistic prepolymer of organic/inorganic modification components in the polyester synthesis stage. Polymer, organic hydrophilic modification component forms a surface chemical bonded coating on the inorganic nano-powder, which solves the problem of the dispersion of the inorganic powder in the polyester matrix. The hydrophilic anti-ultraviolet HOOC-(NHCO)n-COO-ZnO prepolymer is inserted into the polyester molecular chain by copolymerization, which ensures the durability of the anti-fog and anti-ultraviolet properties. At the same time, the prepolymer and the polyester are connected in the form of chemical bonds, which ensures good compatibility between the prepolymer and the polyester; at the same time, the control of the feed ratio of the prepolymer can also achieve the final preparation of the polyester film. Effective regulation of anti-fog performance and anti-ultraviolet performance.

The third step: processing the anti-fog and anti-ultraviolet polyester film.

The prepared hydrophilic and anti-ultraviolet modified polyester is used as component A, and the conventional polyester is used as component B, which is co-extruded through a melt tube through a T-shaped die to form A and B double-layers or ABA three-layers. Anti-fog and anti-ultraviolet polyester film is obtained by biaxial stretching, heat setting and winding. When the present invention makes the film, the casting, biaxial stretching, heat setting and winding are all according to the conventional process, the melt extrusion temperature can be at 220-290°C, the temperature of the casting roll is lower than 35°C, and at 70-100°C Do a longitudinal stretch. The longitudinal stretching ratio is 3 times, and then the transverse stretching is carried out at 100-130°C, and the transverse stretching ratio is 3 times, after being heat-set at 220-245°C, it is cooled to 80°C, and the anti-fog and anti-ultraviolet polymerization film is obtained by winding. Ester film.

The anti-fog and anti-ultraviolet polyester film prepared by the invention has a thickness of 20 μm to 400 μm, the liquid moisture contact angle of layer A of the anti-fog and anti-ultraviolet polyester film is less than or equal to 30°, the ultraviolet blocking rate is 380 nm, and the UVR is greater than or equal to 98%. The liquid moisture contact angle, UV resistance and UVR of the present invention are tested according to the standards of GB/T 30693-2014 "Measurement of Contact Angle of Plastic Film and Water" and GB/T 25274-2010 Method for Determination of Film UV Absorption Rate for Liquid Crystal Display (LCD) . The specific thickness and performance testing data of the anti-fog and anti-ultraviolet polyester film prepared by the present invention are shown in Table 4.

Table 4

In the AB double-layer or ABA three-layer film prepared by the present invention, because the A layer component has excellent hydrophilic properties and the anti-ultraviolet effect of the inorganic powder, the film has good and lasting anti-fog and anti-ultraviolet properties. The feeding ratio of the hydrophilic anti-ultraviolet prepolymer in component A regulates the anti-fog and anti-ultraviolet properties of the polyester film, and therefore has thermodynamic compatibility.

Claims (9)

1. a kind of preparation method of antifog uvioresistant poly ester film, it is characterised in that：Carry out according to the following steps,

The first step：Synthesis hydrophilic uvioresistant HOOC- (NHCO) n-COO-ZnO prepolymers,

By binary acid, water, caprolactam according to mol ratio 0.01~0.1:0.01~0.05:1 is sufficiently mixed that to carry out prepolymerization anti- Should, in 0.01~0.5MPa, reaction temperature is controlled in 230~260 DEG C, prepolymerization the Stress control of the prepolymerization 2~4h be obtained relative viscosity 1.1~1.4, molecular weight 1000~4000g/mol HOOC- (CONH) n-COOH products；Again Add nanometer Zinc oxide powder and benzene sulfonic acid to continue stirring to be reacted, described nanometer Zinc oxide powder addition is acyl in oneself The 0.2~2% of quality, benzene sulfonic acid addition is 200~500ppm of quality of caprolactam, and reaction temperature is controlled 235~255 DEG C, the reaction time control in 1~2h, be obtained hydrophilic uvioresistant HOOC- (NHCO) n-COO-ZnO prepolymers；

Second step：Hydrophilic uvioresistant modified poly ester is prepared,

Hydrophilic uvioresistant HOOC- (NHCO) n-COO-ZnO prepolymers, binary acid, dihydroxylic alcohols, polycondensation catalyst and heat will be obtained Stabilizer and antioxidant mixing mashing are esterified, polycondensation reaction, prepare hydrophilic uvioresistant modified poly ester；Wherein, institute Hydrophilic uvioresistant HOOC- (NHCO) n-COO-ZnO prepolymers, binary acid, the dihydroxylic alcohols stated in molar ratio 0.01~0.1:1:1.2 ~1.5, the addition of described polycondensation catalyst is 100~500ppm of binary acid quality, and the addition of heat stabilizer is two The 0.001~0.02% of first acid quality, the addition of antioxidant is the 0.001~0.03% of binary acid quality；

3rd step：Processing is obtained antifog uvioresistant poly ester film,

The hydrophilic uvioresistant modified poly ester that will be prepared passes through T as B component as component A, normal polyester by melt pipe Pattern coextrusion head is combined into tri- layers of A B bilayers or ABA, and antifog uvioresistant poly is obtained through slab, biaxial tension, thermal finalization and winding Ester film.

2. the preparation method of antifog uvioresistant poly ester film according to claim 1, it is characterised in that：Described is antifog anti- The thickness of ultraviolet polyester film is at 20 μm~400 μm, and A layers of aqueous water contact angle≤30 ° of antifog uvioresistant poly ester film are purple Outside line rejection rate：380nm, UVR >=98%.

3. the preparation method of antifog uvioresistant poly ester film according to claim 1, it is characterised in that：Described esterification is anti- In 240~260 DEG C, time control in 3~5h, and esterification water yield reaches theoretical more than 98% to seasonable temperature control, then enters The polycondensation reaction of 2~4h of row, polycondensation reaction vacuum pressure is in 30~200pa.

4. the preparation method of antifog uvioresistant poly ester film according to claim 1, it is characterised in that：It is described nano oxidized Zinc powder body is prepared by calcination method, and nanometer Zinc oxide powder particle diameter is in 50~100nm.

5. the preparation method of antifog uvioresistant poly ester film according to claim 1, it is characterised in that：Described binary acid Used as the end-capping reagent of polyamide, and binary acid is using the one of which or any two of ethanedioic acid, succinic acid, adipic acid or glutaric acid More than kind.

6. the preparation method of antifog uvioresistant poly ester film according to claim 1, it is characterised in that：The dihydroxylic alcohols is The one of which of ethylene glycol, propane diols, butanediol or pentanediol is any two or more.

7. the preparation method of antifog uvioresistant poly ester film according to claim 1, it is characterised in that：The polycondensation catalysis Agent is the one of which or any two or more in butyl titanate, titanium ethylene glycolate, antimony oxide, antimony acetate, antimony glycol.

8. the preparation method of antifog uvioresistant poly ester film according to claim 1, it is characterised in that：The heat stabilizer It is one of trimethyl phosphate, alkyl phosphoric acid diester or three (nonyl phenyl) phosphite esters or any two or more.

9. the preparation method of a kind of antifog uvioresistant poly ester film according to claim 1, it is characterised in that：The antioxygen Agent is one of antioxidant 1010, antioxidant 168 or antioxidant 616 or any two or more.